drivers/dma/ste_dma40.c

   1 /*
   2  * Copyright (C) Ericsson AB 2007-2008
   3  * Copyright (C) ST-Ericsson SA 2008-2010
   4  * Author: Per Forlin <per.forlin@stericsson.com> for ST-Ericsson
   5  * Author: Jonas Aaberg <jonas.aberg@stericsson.com> for ST-Ericsson
   6  * License terms: GNU General Public License (GPL) version 2
   7  */
   8
   9 #include <linux/dma-mapping.h>
  10 #include <linux/kernel.h>
  11 #include <linux/slab.h>
  12 #include <linux/export.h>
  13 #include <linux/dmaengine.h>
  14 #include <linux/platform_device.h>
  15 #include <linux/clk.h>
  16 #include <linux/delay.h>
  17 #include <linux/log2.h>
  18 #include <linux/pm.h>
  19 #include <linux/pm_runtime.h>
  20 #include <linux/err.h>
  21 #include <linux/of.h>
  22 #include <linux/of_dma.h>
  23 #include <linux/amba/bus.h>
  24 #include <linux/regulator/consumer.h>
  25 #include <linux/platform_data/dma-ste-dma40.h>
  26
  27 #include "dmaengine.h"
  28 #include "ste_dma40_ll.h"
  29
  30 #define D40_NAME "dma40"
  31
  32 #define D40_PHY_CHAN -1
  33
  34 /* For masking out/in 2 bit channel positions */
  35 #define D40_CHAN_POS(chan)  (2 * (chan / 2))
  36 #define D40_CHAN_POS_MASK(chan) (0x3 << D40_CHAN_POS(chan))
  37
  38 /* Maximum iterations taken before giving up suspending a channel */
  39 #define D40_SUSPEND_MAX_IT 500
  40
  41 /* Milliseconds */
  42 #define DMA40_AUTOSUSPEND_DELAY 100
  43
  44 /* Hardware requirement on LCLA alignment */
  45 #define LCLA_ALIGNMENT 0x40000
  46
  47 /* Max number of links per event group */
  48 #define D40_LCLA_LINK_PER_EVENT_GRP 128
  49 #define D40_LCLA_END D40_LCLA_LINK_PER_EVENT_GRP
  50
  51 /* Max number of logical channels per physical channel */
  52 #define D40_MAX_LOG_CHAN_PER_PHY 32
  53
  54 /* Attempts before giving up to trying to get pages that are aligned */
  55 #define MAX_LCLA_ALLOC_ATTEMPTS 256
  56
  57 /* Bit markings for allocation map */
  58 #define D40_ALLOC_FREE          BIT(31)
  59 #define D40_ALLOC_PHY           BIT(30)
  60 #define D40_ALLOC_LOG_FREE      0
  61
  62 #define D40_MEMCPY_MAX_CHANS    8
  63
  64 /* Reserved event lines for memcpy only. */
  65 #define DB8500_DMA_MEMCPY_EV_0  51
  66 #define DB8500_DMA_MEMCPY_EV_1  56
  67 #define DB8500_DMA_MEMCPY_EV_2  57
  68 #define DB8500_DMA_MEMCPY_EV_3  58
  69 #define DB8500_DMA_MEMCPY_EV_4  59
  70 #define DB8500_DMA_MEMCPY_EV_5  60
  71
  72 static int dma40_memcpy_channels[] = {
  73         DB8500_DMA_MEMCPY_EV_0,
  74         DB8500_DMA_MEMCPY_EV_1,
  75         DB8500_DMA_MEMCPY_EV_2,
  76         DB8500_DMA_MEMCPY_EV_3,
  77         DB8500_DMA_MEMCPY_EV_4,
  78         DB8500_DMA_MEMCPY_EV_5,
  79 };
  80
  81 /* Default configuration for physcial memcpy */
  82 static struct stedma40_chan_cfg dma40_memcpy_conf_phy = {
  83         .mode = STEDMA40_MODE_PHYSICAL,
  84         .dir = DMA_MEM_TO_MEM,
  85
  86         .src_info.data_width = DMA_SLAVE_BUSWIDTH_1_BYTE,
  87         .src_info.psize = STEDMA40_PSIZE_PHY_1,
  88         .src_info.flow_ctrl = STEDMA40_NO_FLOW_CTRL,
  89
  90         .dst_info.data_width = DMA_SLAVE_BUSWIDTH_1_BYTE,
  91         .dst_info.psize = STEDMA40_PSIZE_PHY_1,
  92         .dst_info.flow_ctrl = STEDMA40_NO_FLOW_CTRL,
  93 };
  94
  95 /* Default configuration for logical memcpy */
  96 static struct stedma40_chan_cfg dma40_memcpy_conf_log = {
  97         .mode = STEDMA40_MODE_LOGICAL,
  98         .dir = DMA_MEM_TO_MEM,
  99
 100         .src_info.data_width = DMA_SLAVE_BUSWIDTH_1_BYTE,
 101         .src_info.psize = STEDMA40_PSIZE_LOG_1,
 102         .src_info.flow_ctrl = STEDMA40_NO_FLOW_CTRL,
 103
 104         .dst_info.data_width = DMA_SLAVE_BUSWIDTH_1_BYTE,
 105         .dst_info.psize = STEDMA40_PSIZE_LOG_1,
 106         .dst_info.flow_ctrl = STEDMA40_NO_FLOW_CTRL,
 107 };
 108
 109 /**
 110  * enum 40_command - The different commands and/or statuses.
 111  *
 112  * @D40_DMA_STOP: DMA channel command STOP or status STOPPED,
 113  * @D40_DMA_RUN: The DMA channel is RUNNING of the command RUN.
 114  * @D40_DMA_SUSPEND_REQ: Request the DMA to SUSPEND as soon as possible.
 115  * @D40_DMA_SUSPENDED: The DMA channel is SUSPENDED.
 116  */
 117 enum d40_command {
 118         D40_DMA_STOP            = 0,
 119         D40_DMA_RUN             = 1,
 120         D40_DMA_SUSPEND_REQ     = 2,
 121         D40_DMA_SUSPENDED       = 3
 122 };
 123
 124 /*
 125  * enum d40_events - The different Event Enables for the event lines.
 126  *
 127  * @D40_DEACTIVATE_EVENTLINE: De-activate Event line, stopping the logical chan.
 128  * @D40_ACTIVATE_EVENTLINE: Activate the Event line, to start a logical chan.
 129  * @D40_SUSPEND_REQ_EVENTLINE: Requesting for suspending a event line.
 130  * @D40_ROUND_EVENTLINE: Status check for event line.
 131  */
 132
 133 enum d40_events {
 134         D40_DEACTIVATE_EVENTLINE        = 0,
 135         D40_ACTIVATE_EVENTLINE          = 1,
 136         D40_SUSPEND_REQ_EVENTLINE       = 2,
 137         D40_ROUND_EVENTLINE             = 3
 138 };
 139
 140 /*
 141  * These are the registers that has to be saved and later restored
 142  * when the DMA hw is powered off.
 143  * TODO: Add save/restore of D40_DREG_GCC on dma40 v3 or later, if that works.
 144  */
 145 static u32 d40_backup_regs[] = {
 146         D40_DREG_LCPA,
 147         D40_DREG_LCLA,
 148         D40_DREG_PRMSE,
 149         D40_DREG_PRMSO,
 150         D40_DREG_PRMOE,
 151         D40_DREG_PRMOO,
 152 };
 153
 154 #define BACKUP_REGS_SZ ARRAY_SIZE(d40_backup_regs)
 155
 156 /*
 157  * since 9540 and 8540 has the same HW revision
 158  * use v4a for 9540 or ealier
 159  * use v4b for 8540 or later
 160  * HW revision:
 161  * DB8500ed has revision 0
 162  * DB8500v1 has revision 2
 163  * DB8500v2 has revision 3
 164  * AP9540v1 has revision 4
 165  * DB8540v1 has revision 4
 166  * TODO: Check if all these registers have to be saved/restored on dma40 v4a
 167  */
 168 static u32 d40_backup_regs_v4a[] = {
 169         D40_DREG_PSEG1,
 170         D40_DREG_PSEG2,
 171         D40_DREG_PSEG3,
 172         D40_DREG_PSEG4,
 173         D40_DREG_PCEG1,
 174         D40_DREG_PCEG2,
 175         D40_DREG_PCEG3,
 176         D40_DREG_PCEG4,
 177         D40_DREG_RSEG1,
 178         D40_DREG_RSEG2,
 179         D40_DREG_RSEG3,
 180         D40_DREG_RSEG4,
 181         D40_DREG_RCEG1,
 182         D40_DREG_RCEG2,
 183         D40_DREG_RCEG3,
 184         D40_DREG_RCEG4,
 185 };
 186
 187 #define BACKUP_REGS_SZ_V4A ARRAY_SIZE(d40_backup_regs_v4a)
 188
 189 static u32 d40_backup_regs_v4b[] = {
 190         D40_DREG_CPSEG1,
 191         D40_DREG_CPSEG2,
 192         D40_DREG_CPSEG3,
 193         D40_DREG_CPSEG4,
 194         D40_DREG_CPSEG5,
 195         D40_DREG_CPCEG1,
 196         D40_DREG_CPCEG2,
 197         D40_DREG_CPCEG3,
 198         D40_DREG_CPCEG4,
 199         D40_DREG_CPCEG5,
 200         D40_DREG_CRSEG1,
 201         D40_DREG_CRSEG2,
 202         D40_DREG_CRSEG3,
 203         D40_DREG_CRSEG4,
 204         D40_DREG_CRSEG5,
 205         D40_DREG_CRCEG1,
 206         D40_DREG_CRCEG2,
 207         D40_DREG_CRCEG3,
 208         D40_DREG_CRCEG4,
 209         D40_DREG_CRCEG5,
 210 };
 211
 212 #define BACKUP_REGS_SZ_V4B ARRAY_SIZE(d40_backup_regs_v4b)
 213
 214 static u32 d40_backup_regs_chan[] = {
 215         D40_CHAN_REG_SSCFG,
 216         D40_CHAN_REG_SSELT,
 217         D40_CHAN_REG_SSPTR,
 218         D40_CHAN_REG_SSLNK,
 219         D40_CHAN_REG_SDCFG,
 220         D40_CHAN_REG_SDELT,
 221         D40_CHAN_REG_SDPTR,
 222         D40_CHAN_REG_SDLNK,
 223 };
 224
 225 #define BACKUP_REGS_SZ_MAX ((BACKUP_REGS_SZ_V4A > BACKUP_REGS_SZ_V4B) ? \
 226                              BACKUP_REGS_SZ_V4A : BACKUP_REGS_SZ_V4B)
 227
 228 /**
 229  * struct d40_interrupt_lookup - lookup table for interrupt handler
 230  *
 231  * @src: Interrupt mask register.
 232  * @clr: Interrupt clear register.
 233  * @is_error: true if this is an error interrupt.
 234  * @offset: start delta in the lookup_log_chans in d40_base. If equals to
 235  * D40_PHY_CHAN, the lookup_phy_chans shall be used instead.
 236  */
 237 struct d40_interrupt_lookup {
 238         u32 src;
 239         u32 clr;
 240         bool is_error;
 241         int offset;
 242 };
 243
 244
 245 static struct d40_interrupt_lookup il_v4a[] = {
 246         {D40_DREG_LCTIS0, D40_DREG_LCICR0, false,  0},
 247         {D40_DREG_LCTIS1, D40_DREG_LCICR1, false, 32},
 248         {D40_DREG_LCTIS2, D40_DREG_LCICR2, false, 64},
 249         {D40_DREG_LCTIS3, D40_DREG_LCICR3, false, 96},
 250         {D40_DREG_LCEIS0, D40_DREG_LCICR0, true,   0},
 251         {D40_DREG_LCEIS1, D40_DREG_LCICR1, true,  32},
 252         {D40_DREG_LCEIS2, D40_DREG_LCICR2, true,  64},
 253         {D40_DREG_LCEIS3, D40_DREG_LCICR3, true,  96},
 254         {D40_DREG_PCTIS,  D40_DREG_PCICR,  false, D40_PHY_CHAN},
 255         {D40_DREG_PCEIS,  D40_DREG_PCICR,  true,  D40_PHY_CHAN},
 256 };
 257
 258 static struct d40_interrupt_lookup il_v4b[] = {
 259         {D40_DREG_CLCTIS1, D40_DREG_CLCICR1, false,  0},
 260         {D40_DREG_CLCTIS2, D40_DREG_CLCICR2, false, 32},
 261         {D40_DREG_CLCTIS3, D40_DREG_CLCICR3, false, 64},
 262         {D40_DREG_CLCTIS4, D40_DREG_CLCICR4, false, 96},
 263         {D40_DREG_CLCTIS5, D40_DREG_CLCICR5, false, 128},
 264         {D40_DREG_CLCEIS1, D40_DREG_CLCICR1, true,   0},
 265         {D40_DREG_CLCEIS2, D40_DREG_CLCICR2, true,  32},
 266         {D40_DREG_CLCEIS3, D40_DREG_CLCICR3, true,  64},
 267         {D40_DREG_CLCEIS4, D40_DREG_CLCICR4, true,  96},
 268         {D40_DREG_CLCEIS5, D40_DREG_CLCICR5, true,  128},
 269         {D40_DREG_CPCTIS,  D40_DREG_CPCICR,  false, D40_PHY_CHAN},
 270         {D40_DREG_CPCEIS,  D40_DREG_CPCICR,  true,  D40_PHY_CHAN},
 271 };
 272
 273 /**
 274  * struct d40_reg_val - simple lookup struct
 275  *
 276  * @reg: The register.
 277  * @val: The value that belongs to the register in reg.
 278  */
 279 struct d40_reg_val {
 280         unsigned int reg;
 281         unsigned int val;
 282 };
 283
 284 static __initdata struct d40_reg_val dma_init_reg_v4a[] = {
 285         /* Clock every part of the DMA block from start */
 286         { .reg = D40_DREG_GCC,    .val = D40_DREG_GCC_ENABLE_ALL},
 287
 288         /* Interrupts on all logical channels */
 289         { .reg = D40_DREG_LCMIS0, .val = 0xFFFFFFFF},
 290         { .reg = D40_DREG_LCMIS1, .val = 0xFFFFFFFF},
 291         { .reg = D40_DREG_LCMIS2, .val = 0xFFFFFFFF},
 292         { .reg = D40_DREG_LCMIS3, .val = 0xFFFFFFFF},
 293         { .reg = D40_DREG_LCICR0, .val = 0xFFFFFFFF},
 294         { .reg = D40_DREG_LCICR1, .val = 0xFFFFFFFF},
 295         { .reg = D40_DREG_LCICR2, .val = 0xFFFFFFFF},
 296         { .reg = D40_DREG_LCICR3, .val = 0xFFFFFFFF},
 297         { .reg = D40_DREG_LCTIS0, .val = 0xFFFFFFFF},
 298         { .reg = D40_DREG_LCTIS1, .val = 0xFFFFFFFF},
 299         { .reg = D40_DREG_LCTIS2, .val = 0xFFFFFFFF},
 300         { .reg = D40_DREG_LCTIS3, .val = 0xFFFFFFFF}
 301 };
 302 static __initdata struct d40_reg_val dma_init_reg_v4b[] = {
 303         /* Clock every part of the DMA block from start */
 304         { .reg = D40_DREG_GCC,    .val = D40_DREG_GCC_ENABLE_ALL},
 305
 306         /* Interrupts on all logical channels */
 307         { .reg = D40_DREG_CLCMIS1, .val = 0xFFFFFFFF},
 308         { .reg = D40_DREG_CLCMIS2, .val = 0xFFFFFFFF},
 309         { .reg = D40_DREG_CLCMIS3, .val = 0xFFFFFFFF},
 310         { .reg = D40_DREG_CLCMIS4, .val = 0xFFFFFFFF},
 311         { .reg = D40_DREG_CLCMIS5, .val = 0xFFFFFFFF},
 312         { .reg = D40_DREG_CLCICR1, .val = 0xFFFFFFFF},
 313         { .reg = D40_DREG_CLCICR2, .val = 0xFFFFFFFF},
 314         { .reg = D40_DREG_CLCICR3, .val = 0xFFFFFFFF},
 315         { .reg = D40_DREG_CLCICR4, .val = 0xFFFFFFFF},
 316         { .reg = D40_DREG_CLCICR5, .val = 0xFFFFFFFF},
 317         { .reg = D40_DREG_CLCTIS1, .val = 0xFFFFFFFF},
 318         { .reg = D40_DREG_CLCTIS2, .val = 0xFFFFFFFF},
 319         { .reg = D40_DREG_CLCTIS3, .val = 0xFFFFFFFF},
 320         { .reg = D40_DREG_CLCTIS4, .val = 0xFFFFFFFF},
 321         { .reg = D40_DREG_CLCTIS5, .val = 0xFFFFFFFF}
 322 };
 323
 324 /**
 325  * struct d40_lli_pool - Structure for keeping LLIs in memory
 326  *
 327  * @base: Pointer to memory area when the pre_alloc_lli's are not large
 328  * enough, IE bigger than the most common case, 1 dst and 1 src. NULL if
 329  * pre_alloc_lli is used.
 330  * @dma_addr: DMA address, if mapped
 331  * @size: The size in bytes of the memory at base or the size of pre_alloc_lli.
 332  * @pre_alloc_lli: Pre allocated area for the most common case of transfers,
 333  * one buffer to one buffer.
 334  */
 335 struct d40_lli_pool {
 336         void    *base;
 337         int      size;
 338         dma_addr_t      dma_addr;
 339         /* Space for dst and src, plus an extra for padding */
 340         u8       pre_alloc_lli[3 * sizeof(struct d40_phy_lli)];
 341 };
 342
 343 /**
 344  * struct d40_desc - A descriptor is one DMA job.
 345  *
 346  * @lli_phy: LLI settings for physical channel. Both src and dst=
 347  * points into the lli_pool, to base if lli_len > 1 or to pre_alloc_lli if
 348  * lli_len equals one.
 349  * @lli_log: Same as above but for logical channels.
 350  * @lli_pool: The pool with two entries pre-allocated.
 351  * @lli_len: Number of llis of current descriptor.
 352  * @lli_current: Number of transferred llis.
 353  * @lcla_alloc: Number of LCLA entries allocated.
 354  * @txd: DMA engine struct. Used for among other things for communication
 355  * during a transfer.
 356  * @node: List entry.
 357  * @is_in_client_list: true if the client owns this descriptor.
 358  * @cyclic: true if this is a cyclic job
 359  *
 360  * This descriptor is used for both logical and physical transfers.
 361  */
 362 struct d40_desc {
 363         /* LLI physical */
 364         struct d40_phy_lli_bidir         lli_phy;
 365         /* LLI logical */
 366         struct d40_log_lli_bidir         lli_log;
 367
 368         struct d40_lli_pool              lli_pool;
 369         int                              lli_len;
 370         int                              lli_current;
 371         int                              lcla_alloc;
 372
 373         struct dma_async_tx_descriptor   txd;
 374         struct list_head                 node;
 375
 376         bool                             is_in_client_list;
 377         bool                             cyclic;
 378 };
 379
 380 /**
 381  * struct d40_lcla_pool - LCLA pool settings and data.
 382  *
 383  * @base: The virtual address of LCLA. 18 bit aligned.
 384  * @base_unaligned: The orignal kmalloc pointer, if kmalloc is used.
 385  * This pointer is only there for clean-up on error.
 386  * @pages: The number of pages needed for all physical channels.
 387  * Only used later for clean-up on error
 388  * @lock: Lock to protect the content in this struct.
 389  * @alloc_map: big map over which LCLA entry is own by which job.
 390  */
 391 struct d40_lcla_pool {
 392         void            *base;
 393         dma_addr_t      dma_addr;
 394         void            *base_unaligned;
 395         int              pages;
 396         spinlock_t       lock;
 397         struct d40_desc **alloc_map;
 398 };
 399
 400 /**
 401  * struct d40_phy_res - struct for handling eventlines mapped to physical
 402  * channels.
 403  *
 404  * @lock: A lock protection this entity.
 405  * @reserved: True if used by secure world or otherwise.
 406  * @num: The physical channel number of this entity.
 407  * @allocated_src: Bit mapped to show which src event line's are mapped to
 408  * this physical channel. Can also be free or physically allocated.
 409  * @allocated_dst: Same as for src but is dst.
 410  * allocated_dst and allocated_src uses the D40_ALLOC* defines as well as
 411  * event line number.
 412  * @use_soft_lli: To mark if the linked lists of channel are managed by SW.
 413  */
 414 struct d40_phy_res {
 415         spinlock_t lock;
 416         bool       reserved;
 417         int        num;
 418         u32        allocated_src;
 419         u32        allocated_dst;
 420         bool       use_soft_lli;
 421 };
 422
 423 struct d40_base;
 424
 425 /**
 426  * struct d40_chan - Struct that describes a channel.
 427  *
 428  * @lock: A spinlock to protect this struct.
 429  * @log_num: The logical number, if any of this channel.
 430  * @pending_tx: The number of pending transfers. Used between interrupt handler
 431  * and tasklet.
 432  * @busy: Set to true when transfer is ongoing on this channel.
 433  * @phy_chan: Pointer to physical channel which this instance runs on. If this
 434  * point is NULL, then the channel is not allocated.
 435  * @chan: DMA engine handle.
 436  * @tasklet: Tasklet that gets scheduled from interrupt context to complete a
 437  * transfer and call client callback.
 438  * @client: Cliented owned descriptor list.
 439  * @pending_queue: Submitted jobs, to be issued by issue_pending()
 440  * @active: Active descriptor.
 441  * @done: Completed jobs
 442  * @queue: Queued jobs.
 443  * @prepare_queue: Prepared jobs.
 444  * @dma_cfg: The client configuration of this dma channel.
 445  * @configured: whether the dma_cfg configuration is valid
 446  * @base: Pointer to the device instance struct.
 447  * @src_def_cfg: Default cfg register setting for src.
 448  * @dst_def_cfg: Default cfg register setting for dst.
 449  * @log_def: Default logical channel settings.
 450  * @lcpa: Pointer to dst and src lcpa settings.
 451  * @runtime_addr: runtime configured address.
 452  * @runtime_direction: runtime configured direction.
 453  *
 454  * This struct can either "be" a logical or a physical channel.
 455  */
 456 struct d40_chan {
 457         spinlock_t                       lock;
 458         int                              log_num;
 459         int                              pending_tx;
 460         bool                             busy;
 461         struct d40_phy_res              *phy_chan;
 462         struct dma_chan                  chan;
 463         struct tasklet_struct            tasklet;
 464         struct list_head                 client;
 465         struct list_head                 pending_queue;
 466         struct list_head                 active;
 467         struct list_head                 done;
 468         struct list_head                 queue;
 469         struct list_head                 prepare_queue;
 470         struct stedma40_chan_cfg         dma_cfg;
 471         bool                             configured;
 472         struct d40_base                 *base;
 473         /* Default register configurations */
 474         u32                              src_def_cfg;
 475         u32                              dst_def_cfg;
 476         struct d40_def_lcsp              log_def;
 477         struct d40_log_lli_full         *lcpa;
 478         /* Runtime reconfiguration */
 479         dma_addr_t                      runtime_addr;
 480         enum dma_transfer_direction     runtime_direction;
 481 };
 482
 483 /**
 484  * struct d40_gen_dmac - generic values to represent u8500/u8540 DMA
 485  * controller
 486  *
 487  * @backup: the pointer to the registers address array for backup
 488  * @backup_size: the size of the registers address array for backup
 489  * @realtime_en: the realtime enable register
 490  * @realtime_clear: the realtime clear register
 491  * @high_prio_en: the high priority enable register
 492  * @high_prio_clear: the high priority clear register
 493  * @interrupt_en: the interrupt enable register
 494  * @interrupt_clear: the interrupt clear register
 495  * @il: the pointer to struct d40_interrupt_lookup
 496  * @il_size: the size of d40_interrupt_lookup array
 497  * @init_reg: the pointer to the struct d40_reg_val
 498  * @init_reg_size: the size of d40_reg_val array
 499  */
 500 struct d40_gen_dmac {
 501         u32                             *backup;
 502         u32                              backup_size;
 503         u32                              realtime_en;
 504         u32                              realtime_clear;
 505         u32                              high_prio_en;
 506         u32                              high_prio_clear;
 507         u32                              interrupt_en;
 508         u32                              interrupt_clear;
 509         struct d40_interrupt_lookup     *il;
 510         u32                              il_size;
 511         struct d40_reg_val              *init_reg;
 512         u32                              init_reg_size;
 513 };
 514
 515 /**
 516  * struct d40_base - The big global struct, one for each probe'd instance.
 517  *
 518  * @interrupt_lock: Lock used to make sure one interrupt is handle a time.
 519  * @execmd_lock: Lock for execute command usage since several channels share
 520  * the same physical register.
 521  * @dev: The device structure.
 522  * @virtbase: The virtual base address of the DMA's register.
 523  * @rev: silicon revision detected.
 524  * @clk: Pointer to the DMA clock structure.
 525  * @phy_start: Physical memory start of the DMA registers.
 526  * @phy_size: Size of the DMA register map.
 527  * @irq: The IRQ number.
 528  * @num_memcpy_chans: The number of channels used for memcpy (mem-to-mem
 529  * transfers).
 530  * @num_phy_chans: The number of physical channels. Read from HW. This
 531  * is the number of available channels for this driver, not counting "Secure
 532  * mode" allocated physical channels.
 533  * @num_log_chans: The number of logical channels. Calculated from
 534  * num_phy_chans.
 535  * @dma_both: dma_device channels that can do both memcpy and slave transfers.
 536  * @dma_slave: dma_device channels that can do only do slave transfers.
 537  * @dma_memcpy: dma_device channels that can do only do memcpy transfers.
 538  * @phy_chans: Room for all possible physical channels in system.
 539  * @log_chans: Room for all possible logical channels in system.
 540  * @lookup_log_chans: Used to map interrupt number to logical channel. Points
 541  * to log_chans entries.
 542  * @lookup_phy_chans: Used to map interrupt number to physical channel. Points
 543  * to phy_chans entries.
 544  * @plat_data: Pointer to provided platform_data which is the driver
 545  * configuration.
 546  * @lcpa_regulator: Pointer to hold the regulator for the esram bank for lcla.
 547  * @phy_res: Vector containing all physical channels.
 548  * @lcla_pool: lcla pool settings and data.
 549  * @lcpa_base: The virtual mapped address of LCPA.
 550  * @phy_lcpa: The physical address of the LCPA.
 551  * @lcpa_size: The size of the LCPA area.
 552  * @desc_slab: cache for descriptors.
 553  * @reg_val_backup: Here the values of some hardware registers are stored
 554  * before the DMA is powered off. They are restored when the power is back on.
 555  * @reg_val_backup_v4: Backup of registers that only exits on dma40 v3 and
 556  * later
 557  * @reg_val_backup_chan: Backup data for standard channel parameter registers.
 558  * @gcc_pwr_off_mask: Mask to maintain the channels that can be turned off.
 559  * @gen_dmac: the struct for generic registers values to represent u8500/8540
 560  * DMA controller
 561  */
 562 struct d40_base {
 563         spinlock_t                       interrupt_lock;
 564         spinlock_t                       execmd_lock;
 565         struct device                    *dev;
 566         void __iomem                     *virtbase;
 567         u8                                rev:4;
 568         struct clk                       *clk;
 569         phys_addr_t                       phy_start;
 570         resource_size_t                   phy_size;
 571         int                               irq;
 572         int                               num_memcpy_chans;
 573         int                               num_phy_chans;
 574         int                               num_log_chans;
 575         struct device_dma_parameters      dma_parms;
 576         struct dma_device                 dma_both;
 577         struct dma_device                 dma_slave;
 578         struct dma_device                 dma_memcpy;
 579         struct d40_chan                  *phy_chans;
 580         struct d40_chan                  *log_chans;
 581         struct d40_chan                 **lookup_log_chans;
 582         struct d40_chan                 **lookup_phy_chans;
 583         struct stedma40_platform_data    *plat_data;
 584         struct regulator                 *lcpa_regulator;
 585         /* Physical half channels */
 586         struct d40_phy_res               *phy_res;
 587         struct d40_lcla_pool              lcla_pool;
 588         void                             *lcpa_base;
 589         dma_addr_t                        phy_lcpa;
 590         resource_size_t                   lcpa_size;
 591         struct kmem_cache                *desc_slab;
 592         u32                               reg_val_backup[BACKUP_REGS_SZ];
 593         u32                               reg_val_backup_v4[BACKUP_REGS_SZ_MAX];
 594         u32                              *reg_val_backup_chan;
 595         u16                               gcc_pwr_off_mask;
 596         struct d40_gen_dmac               gen_dmac;
 597 };
 598
 599 static struct device *chan2dev(struct d40_chan *d40c)
 600 {
 601         return &d40c->chan.dev->device;
 602 }
 603
 604 static bool chan_is_physical(struct d40_chan *chan)
 605 {
 606         return chan->log_num == D40_PHY_CHAN;
 607 }
 608
 609 static bool chan_is_logical(struct d40_chan *chan)
 610 {
 611         return !chan_is_physical(chan);
 612 }
 613
 614 static void __iomem *chan_base(struct d40_chan *chan)
 615 {
 616         return chan->base->virtbase + D40_DREG_PCBASE +
 617                chan->phy_chan->num * D40_DREG_PCDELTA;
 618 }
 619
 620 #define d40_err(dev, format, arg...)            \
 621         dev_err(dev, "[%s] " format, __func__, ## arg)
 622
 623 #define chan_err(d40c, format, arg...)          \
 624         d40_err(chan2dev(d40c), format, ## arg)
 625
 626 static int d40_pool_lli_alloc(struct d40_chan *d40c, struct d40_desc *d40d,
 627                               int lli_len)
 628 {
 629         bool is_log = chan_is_logical(d40c);
 630         u32 align;
 631         void *base;
 632
 633         if (is_log)
 634                 align = sizeof(struct d40_log_lli);
 635         else
 636                 align = sizeof(struct d40_phy_lli);
 637
 638         if (lli_len == 1) {
 639                 base = d40d->lli_pool.pre_alloc_lli;
 640                 d40d->lli_pool.size = sizeof(d40d->lli_pool.pre_alloc_lli);
 641                 d40d->lli_pool.base = NULL;
 642         } else {
 643                 d40d->lli_pool.size = lli_len * 2 * align;
 644
 645                 base = kmalloc(d40d->lli_pool.size + align, GFP_NOWAIT);
 646                 d40d->lli_pool.base = base;
 647
 648                 if (d40d->lli_pool.base == NULL)
 649                         return -ENOMEM;
 650         }
 651
 652         if (is_log) {
 653                 d40d->lli_log.src = PTR_ALIGN(base, align);
 654                 d40d->lli_log.dst = d40d->lli_log.src + lli_len;
 655
 656                 d40d->lli_pool.dma_addr = 0;
 657         } else {
 658                 d40d->lli_phy.src = PTR_ALIGN(base, align);
 659                 d40d->lli_phy.dst = d40d->lli_phy.src + lli_len;
 660
 661                 d40d->lli_pool.dma_addr = dma_map_single(d40c->base->dev,
 662                                                          d40d->lli_phy.src,
 663                                                          d40d->lli_pool.size,
 664                                                          DMA_TO_DEVICE);
 665
 666                 if (dma_mapping_error(d40c->base->dev,
 667                                       d40d->lli_pool.dma_addr)) {
 668                         kfree(d40d->lli_pool.base);
 669                         d40d->lli_pool.base = NULL;
 670                         d40d->lli_pool.dma_addr = 0;
 671                         return -ENOMEM;
 672                 }
 673         }
 674
 675         return 0;
 676 }
 677
 678 static void d40_pool_lli_free(struct d40_chan *d40c, struct d40_desc *d40d)
 679 {
 680         if (d40d->lli_pool.dma_addr)
 681                 dma_unmap_single(d40c->base->dev, d40d->lli_pool.dma_addr,
 682                                  d40d->lli_pool.size, DMA_TO_DEVICE);
 683
 684         kfree(d40d->lli_pool.base);
 685         d40d->lli_pool.base = NULL;
 686         d40d->lli_pool.size = 0;
 687         d40d->lli_log.src = NULL;
 688         d40d->lli_log.dst = NULL;
 689         d40d->lli_phy.src = NULL;
 690         d40d->lli_phy.dst = NULL;
 691 }
 692
 693 static int d40_lcla_alloc_one(struct d40_chan *d40c,
 694                               struct d40_desc *d40d)
 695 {
 696         unsigned long flags;
 697         int i;
 698         int ret = -EINVAL;
 699
 700         spin_lock_irqsave(&d40c->base->lcla_pool.lock, flags);
 701
 702         /*
 703          * Allocate both src and dst at the same time, therefore the half
 704          * start on 1 since 0 can't be used since zero is used as end marker.
 705          */
 706         for (i = 1 ; i < D40_LCLA_LINK_PER_EVENT_GRP / 2; i++) {
 707                 int idx = d40c->phy_chan->num * D40_LCLA_LINK_PER_EVENT_GRP + i;
 708
 709                 if (!d40c->base->lcla_pool.alloc_map[idx]) {
 710                         d40c->base->lcla_pool.alloc_map[idx] = d40d;
 711                         d40d->lcla_alloc++;
 712                         ret = i;
 713                         break;
 714                 }
 715         }
 716
 717         spin_unlock_irqrestore(&d40c->base->lcla_pool.lock, flags);
 718
 719         return ret;
 720 }
 721
 722 static int d40_lcla_free_all(struct d40_chan *d40c,
 723                              struct d40_desc *d40d)
 724 {
 725         unsigned long flags;
 726         int i;
 727         int ret = -EINVAL;
 728
 729         if (chan_is_physical(d40c))
 730                 return 0;
 731
 732         spin_lock_irqsave(&d40c->base->lcla_pool.lock, flags);
 733
 734         for (i = 1 ; i < D40_LCLA_LINK_PER_EVENT_GRP / 2; i++) {
 735                 int idx = d40c->phy_chan->num * D40_LCLA_LINK_PER_EVENT_GRP + i;
 736
 737                 if (d40c->base->lcla_pool.alloc_map[idx] == d40d) {
 738                         d40c->base->lcla_pool.alloc_map[idx] = NULL;
 739                         d40d->lcla_alloc--;
 740                         if (d40d->lcla_alloc == 0) {
 741                                 ret = 0;
 742                                 break;
 743                         }
 744                 }
 745         }
 746
 747         spin_unlock_irqrestore(&d40c->base->lcla_pool.lock, flags);
 748
 749         return ret;
 750
 751 }
 752
 753 static void d40_desc_remove(struct d40_desc *d40d)
 754 {
 755         list_del(&d40d->node);
 756 }
 757
 758 static struct d40_desc *d40_desc_get(struct d40_chan *d40c)
 759 {
 760         struct d40_desc *desc = NULL;
 761
 762         if (!list_empty(&d40c->client)) {
 763                 struct d40_desc *d;
 764                 struct d40_desc *_d;
 765
 766                 list_for_each_entry_safe(d, _d, &d40c->client, node) {
 767                         if (async_tx_test_ack(&d->txd)) {
 768                                 d40_desc_remove(d);
 769                                 desc = d;
 770                                 memset(desc, 0, sizeof(*desc));
 771                                 break;
 772                         }
 773                 }
 774         }
 775
 776         if (!desc)
 777                 desc = kmem_cache_zalloc(d40c->base->desc_slab, GFP_NOWAIT);
 778
 779         if (desc)
 780                 INIT_LIST_HEAD(&desc->node);
 781
 782         return desc;
 783 }
 784
 785 static void d40_desc_free(struct d40_chan *d40c, struct d40_desc *d40d)
 786 {
 787
 788         d40_pool_lli_free(d40c, d40d);
 789         d40_lcla_free_all(d40c, d40d);
 790         kmem_cache_free(d40c->base->desc_slab, d40d);
 791 }
 792
 793 static void d40_desc_submit(struct d40_chan *d40c, struct d40_desc *desc)
 794 {
 795         list_add_tail(&desc->node, &d40c->active);
 796 }
 797
 798 static void d40_phy_lli_load(struct d40_chan *chan, struct d40_desc *desc)
 799 {
 800         struct d40_phy_lli *lli_dst = desc->lli_phy.dst;
 801         struct d40_phy_lli *lli_src = desc->lli_phy.src;
 802         void __iomem *base = chan_base(chan);
 803
 804         writel(lli_src->reg_cfg, base + D40_CHAN_REG_SSCFG);
 805         writel(lli_src->reg_elt, base + D40_CHAN_REG_SSELT);
 806         writel(lli_src->reg_ptr, base + D40_CHAN_REG_SSPTR);
 807         writel(lli_src->reg_lnk, base + D40_CHAN_REG_SSLNK);
 808
 809         writel(lli_dst->reg_cfg, base + D40_CHAN_REG_SDCFG);
 810         writel(lli_dst->reg_elt, base + D40_CHAN_REG_SDELT);
 811         writel(lli_dst->reg_ptr, base + D40_CHAN_REG_SDPTR);
 812         writel(lli_dst->reg_lnk, base + D40_CHAN_REG_SDLNK);
 813 }
 814
 815 static void d40_desc_done(struct d40_chan *d40c, struct d40_desc *desc)
 816 {
 817         list_add_tail(&desc->node, &d40c->done);
 818 }
 819
 820 static void d40_log_lli_to_lcxa(struct d40_chan *chan, struct d40_desc *desc)
 821 {
 822         struct d40_lcla_pool *pool = &chan->base->lcla_pool;
 823         struct d40_log_lli_bidir *lli = &desc->lli_log;
 824         int lli_current = desc->lli_current;
 825         int lli_len = desc->lli_len;
 826         bool cyclic = desc->cyclic;
 827         int curr_lcla = -EINVAL;
 828         int first_lcla = 0;
 829         bool use_esram_lcla = chan->base->plat_data->use_esram_lcla;
 830         bool linkback;
 831
 832         /*
 833          * We may have partially running cyclic transfers, in case we did't get
 834          * enough LCLA entries.
 835          */
 836         linkback = cyclic && lli_current == 0;
 837
 838         /*
 839          * For linkback, we need one LCLA even with only one link, because we
 840          * can't link back to the one in LCPA space
 841          */
 842         if (linkback || (lli_len - lli_current > 1)) {
 843                 /*
 844                  * If the channel is expected to use only soft_lli don't
 845                  * allocate a lcla. This is to avoid a HW issue that exists
 846                  * in some controller during a peripheral to memory transfer
 847                  * that uses linked lists.
 848                  */
 849                 if (!(chan->phy_chan->use_soft_lli &&
 850                         chan->dma_cfg.dir == DMA_DEV_TO_MEM))
 851                         curr_lcla = d40_lcla_alloc_one(chan, desc);
 852
 853                 first_lcla = curr_lcla;
 854         }
 855
 856         /*
 857          * For linkback, we normally load the LCPA in the loop since we need to
 858          * link it to the second LCLA and not the first.  However, if we
 859          * couldn't even get a first LCLA, then we have to run in LCPA and
 860          * reload manually.
 861          */
 862         if (!linkback || curr_lcla == -EINVAL) {
 863                 unsigned int flags = 0;
 864
 865                 if (curr_lcla == -EINVAL)
 866                         flags |= LLI_TERM_INT;
 867
 868                 d40_log_lli_lcpa_write(chan->lcpa,
 869                                        &lli->dst[lli_current],
 870                                        &lli->src[lli_current],
 871                                        curr_lcla,
 872                                        flags);
 873                 lli_current++;
 874         }
 875
 876         if (curr_lcla < 0)
 877                 goto out;
 878
 879         for (; lli_current < lli_len; lli_current++) {
 880                 unsigned int lcla_offset = chan->phy_chan->num * 1024 +
 881                                            8 * curr_lcla * 2;
 882                 struct d40_log_lli *lcla = pool->base + lcla_offset;
 883                 unsigned int flags = 0;
 884                 int next_lcla;
 885
 886                 if (lli_current + 1 < lli_len)
 887                         next_lcla = d40_lcla_alloc_one(chan, desc);
 888                 else
 889                         next_lcla = linkback ? first_lcla : -EINVAL;
 890
 891                 if (cyclic || next_lcla == -EINVAL)
 892                         flags |= LLI_TERM_INT;
 893
 894                 if (linkback && curr_lcla == first_lcla) {
 895                         /* First link goes in both LCPA and LCLA */
 896                         d40_log_lli_lcpa_write(chan->lcpa,
 897                                                &lli->dst[lli_current],
 898                                                &lli->src[lli_current],
 899                                                next_lcla, flags);
 900                 }
 901
 902                 /*
 903                  * One unused LCLA in the cyclic case if the very first
 904                  * next_lcla fails...
 905                  */
 906                 d40_log_lli_lcla_write(lcla,
 907                                        &lli->dst[lli_current],
 908                                        &lli->src[lli_current],
 909                                        next_lcla, flags);
 910
 911                 /*
 912                  * Cache maintenance is not needed if lcla is
 913                  * mapped in esram
 914                  */
 915                 if (!use_esram_lcla) {
 916                         dma_sync_single_range_for_device(chan->base->dev,
 917                                                 pool->dma_addr, lcla_offset,
 918                                                 2 * sizeof(struct d40_log_lli),
 919                                                 DMA_TO_DEVICE);
 920                 }
 921                 curr_lcla = next_lcla;
 922
 923                 if (curr_lcla == -EINVAL || curr_lcla == first_lcla) {
 924                         lli_current++;
 925                         break;
 926                 }
 927         }
 928
 929 out:
 930         desc->lli_current = lli_current;
 931 }
 932
 933 static void d40_desc_load(struct d40_chan *d40c, struct d40_desc *d40d)
 934 {
 935         if (chan_is_physical(d40c)) {
 936                 d40_phy_lli_load(d40c, d40d);
 937                 d40d->lli_current = d40d->lli_len;
 938         } else
 939                 d40_log_lli_to_lcxa(d40c, d40d);
 940 }
 941
 942 static struct d40_desc *d40_first_active_get(struct d40_chan *d40c)
 943 {
 944         struct d40_desc *d;
 945
 946         if (list_empty(&d40c->active))
 947                 return NULL;
 948
 949         d = list_first_entry(&d40c->active,
 950                              struct d40_desc,
 951                              node);
 952         return d;
 953 }
 954
 955 /* remove desc from current queue and add it to the pending_queue */
 956 static void d40_desc_queue(struct d40_chan *d40c, struct d40_desc *desc)
 957 {
 958         d40_desc_remove(desc);
 959         desc->is_in_client_list = false;
 960         list_add_tail(&desc->node, &d40c->pending_queue);
 961 }
 962
 963 static struct d40_desc *d40_first_pending(struct d40_chan *d40c)
 964 {
 965         struct d40_desc *d;
 966
 967         if (list_empty(&d40c->pending_queue))
 968                 return NULL;
 969
 970         d = list_first_entry(&d40c->pending_queue,
 971                              struct d40_desc,
 972                              node);
 973         return d;
 974 }
 975
 976 static struct d40_desc *d40_first_queued(struct d40_chan *d40c)
 977 {
 978         struct d40_desc *d;
 979
 980         if (list_empty(&d40c->queue))
 981                 return NULL;
 982
 983         d = list_first_entry(&d40c->queue,
 984                              struct d40_desc,
 985                              node);
 986         return d;
 987 }
 988
 989 static struct d40_desc *d40_first_done(struct d40_chan *d40c)
 990 {
 991         if (list_empty(&d40c->done))
 992                 return NULL;
 993
 994         return list_first_entry(&d40c->done, struct d40_desc, node);
 995 }
 996
 997 static int d40_psize_2_burst_size(bool is_log, int psize)
 998 {
 999         if (is_log) {
1000                 if (psize == STEDMA40_PSIZE_LOG_1)
1001                         return 1;
1002         } else {
1003                 if (psize == STEDMA40_PSIZE_PHY_1)
1004                         return 1;
1005         }
1006
1007         return 2 << psize;
1008 }
1009
1010 /*
1011  * The dma only supports transmitting packages up to
1012  * STEDMA40_MAX_SEG_SIZE * data_width, where data_width is stored in Bytes.
1013  *
1014  * Calculate the total number of dma elements required to send the entire sg list.
1015  */
1016 static int d40_size_2_dmalen(int size, u32 data_width1, u32 data_width2)
1017 {
1018         int dmalen;
1019         u32 max_w = max(data_width1, data_width2);
1020         u32 min_w = min(data_width1, data_width2);
1021         u32 seg_max = ALIGN(STEDMA40_MAX_SEG_SIZE * min_w, max_w);
1022
1023         if (seg_max > STEDMA40_MAX_SEG_SIZE)
1024                 seg_max -= max_w;
1025
1026         if (!IS_ALIGNED(size, max_w))
1027                 return -EINVAL;
1028
1029         if (size <= seg_max)
1030                 dmalen = 1;
1031         else {
1032                 dmalen = size / seg_max;
1033                 if (dmalen * seg_max < size)
1034                         dmalen++;
1035         }
1036         return dmalen;
1037 }
1038
1039 static int d40_sg_2_dmalen(struct scatterlist *sgl, int sg_len,
1040                            u32 data_width1, u32 data_width2)
1041 {
1042         struct scatterlist *sg;
1043         int i;
1044         int len = 0;
1045         int ret;
1046
1047         for_each_sg(sgl, sg, sg_len, i) {
1048                 ret = d40_size_2_dmalen(sg_dma_len(sg),
1049                                         data_width1, data_width2);
1050                 if (ret < 0)
1051                         return ret;
1052                 len += ret;
1053         }
1054         return len;
1055 }
1056
1057 static int __d40_execute_command_phy(struct d40_chan *d40c,
1058                                      enum d40_command command)
1059 {
1060         u32 status;
1061         int i;
1062         void __iomem *active_reg;
1063         int ret = 0;
1064         unsigned long flags;
1065         u32 wmask;
1066
1067         if (command == D40_DMA_STOP) {
1068                 ret = __d40_execute_command_phy(d40c, D40_DMA_SUSPEND_REQ);
1069                 if (ret)
1070                         return ret;
1071         }
1072
1073         spin_lock_irqsave(&d40c->base->execmd_lock, flags);
1074
1075         if (d40c->phy_chan->num % 2 == 0)
1076                 active_reg = d40c->base->virtbase + D40_DREG_ACTIVE;
1077         else
1078                 active_reg = d40c->base->virtbase + D40_DREG_ACTIVO;
1079
1080         if (command == D40_DMA_SUSPEND_REQ) {
1081                 status = (readl(active_reg) &
1082                           D40_CHAN_POS_MASK(d40c->phy_chan->num)) >>
1083                         D40_CHAN_POS(d40c->phy_chan->num);
1084
1085                 if (status == D40_DMA_SUSPENDED || status == D40_DMA_STOP)
1086                         goto unlock;
1087         }
1088
1089         wmask = 0xffffffff & ~(D40_CHAN_POS_MASK(d40c->phy_chan->num));
1090         writel(wmask | (command << D40_CHAN_POS(d40c->phy_chan->num)),
1091                active_reg);
1092
1093         if (command == D40_DMA_SUSPEND_REQ) {
1094
1095                 for (i = 0 ; i < D40_SUSPEND_MAX_IT; i++) {
1096                         status = (readl(active_reg) &
1097                                   D40_CHAN_POS_MASK(d40c->phy_chan->num)) >>
1098                                 D40_CHAN_POS(d40c->phy_chan->num);
1099
1100                         cpu_relax();
1101                         /*
1102                          * Reduce the number of bus accesses while
1103                          * waiting for the DMA to suspend.
1104                          */
1105                         udelay(3);
1106
1107                         if (status == D40_DMA_STOP ||
1108                             status == D40_DMA_SUSPENDED)
1109                                 break;
1110                 }
1111
1112                 if (i == D40_SUSPEND_MAX_IT) {
1113                         chan_err(d40c,
1114                                 "unable to suspend the chl %d (log: %d) status %x\n",
1115                                 d40c->phy_chan->num, d40c->log_num,
1116                                 status);
1117                         dump_stack();
1118                         ret = -EBUSY;
1119                 }
1120
1121         }
1122  unlock:
1123         spin_unlock_irqrestore(&d40c->base->execmd_lock, flags);
1124         return ret;
1125 }
1126
1127 static void d40_term_all(struct d40_chan *d40c)
1128 {
1129         struct d40_desc *d40d;
1130         struct d40_desc *_d;
1131
1132         /* Release completed descriptors */
1133         while ((d40d = d40_first_done(d40c))) {
1134                 d40_desc_remove(d40d);
1135                 d40_desc_free(d40c, d40d);
1136         }
1137
1138         /* Release active descriptors */
1139         while ((d40d = d40_first_active_get(d40c))) {
1140                 d40_desc_remove(d40d);
1141                 d40_desc_free(d40c, d40d);
1142         }
1143
1144         /* Release queued descriptors waiting for transfer */
1145         while ((d40d = d40_first_queued(d40c))) {
1146                 d40_desc_remove(d40d);
1147                 d40_desc_free(d40c, d40d);
1148         }
1149
1150         /* Release pending descriptors */
1151         while ((d40d = d40_first_pending(d40c))) {
1152                 d40_desc_remove(d40d);
1153                 d40_desc_free(d40c, d40d);
1154         }
1155
1156         /* Release client owned descriptors */
1157         if (!list_empty(&d40c->client))
1158                 list_for_each_entry_safe(d40d, _d, &d40c->client, node) {
1159                         d40_desc_remove(d40d);
1160                         d40_desc_free(d40c, d40d);
1161                 }
1162
1163         /* Release descriptors in prepare queue */
1164         if (!list_empty(&d40c->prepare_queue))
1165                 list_for_each_entry_safe(d40d, _d,
1166                                          &d40c->prepare_queue, node) {
1167                         d40_desc_remove(d40d);
1168                         d40_desc_free(d40c, d40d);
1169                 }
1170
1171         d40c->pending_tx = 0;
1172 }
1173
1174 static void __d40_config_set_event(struct d40_chan *d40c,
1175                                    enum d40_events event_type, u32 event,
1176                                    int reg)
1177 {
1178         void __iomem *addr = chan_base(d40c) + reg;
1179         int tries;
1180         u32 status;
1181
1182         switch (event_type) {
1183
1184         case D40_DEACTIVATE_EVENTLINE:
1185
1186                 writel((D40_DEACTIVATE_EVENTLINE << D40_EVENTLINE_POS(event))
1187                        | ~D40_EVENTLINE_MASK(event), addr);
1188                 break;
1189
1190         case D40_SUSPEND_REQ_EVENTLINE:
1191                 status = (readl(addr) & D40_EVENTLINE_MASK(event)) >>
1192                           D40_EVENTLINE_POS(event);
1193
1194                 if (status == D40_DEACTIVATE_EVENTLINE ||
1195                     status == D40_SUSPEND_REQ_EVENTLINE)
1196                         break;
1197
1198                 writel((D40_SUSPEND_REQ_EVENTLINE << D40_EVENTLINE_POS(event))
1199                        | ~D40_EVENTLINE_MASK(event), addr);
1200
1201                 for (tries = 0 ; tries < D40_SUSPEND_MAX_IT; tries++) {
1202
1203                         status = (readl(addr) & D40_EVENTLINE_MASK(event)) >>
1204                                   D40_EVENTLINE_POS(event);
1205
1206                         cpu_relax();
1207                         /*
1208                          * Reduce the number of bus accesses while
1209                          * waiting for the DMA to suspend.
1210                          */
1211                         udelay(3);
1212
1213                         if (status == D40_DEACTIVATE_EVENTLINE)
1214                                 break;
1215                 }
1216
1217                 if (tries == D40_SUSPEND_MAX_IT) {
1218                         chan_err(d40c,
1219                                 "unable to stop the event_line chl %d (log: %d)"
1220                                 "status %x\n", d40c->phy_chan->num,
1221                                  d40c->log_num, status);
1222                 }
1223                 break;
1224
1225         case D40_ACTIVATE_EVENTLINE:
1226         /*
1227          * The hardware sometimes doesn't register the enable when src and dst
1228          * event lines are active on the same logical channel.  Retry to ensure
1229          * it does.  Usually only one retry is sufficient.
1230          */
1231                 tries = 100;
1232                 while (--tries) {
1233                         writel((D40_ACTIVATE_EVENTLINE <<
1234                                 D40_EVENTLINE_POS(event)) |
1235                                 ~D40_EVENTLINE_MASK(event), addr);
1236
1237                         if (readl(addr) & D40_EVENTLINE_MASK(event))
1238                                 break;
1239                 }
1240
1241                 if (tries != 99)
1242                         dev_dbg(chan2dev(d40c),
1243                                 "[%s] workaround enable S%cLNK (%d tries)\n",
1244                                 __func__, reg == D40_CHAN_REG_SSLNK ? 'S' : 'D',
1245                                 100 - tries);
1246
1247                 WARN_ON(!tries);
1248                 break;
1249
1250         case D40_ROUND_EVENTLINE:
1251                 BUG();
1252                 break;
1253
1254         }
1255 }
1256
1257 static void d40_config_set_event(struct d40_chan *d40c,
1258                                  enum d40_events event_type)
1259 {
1260         u32 event = D40_TYPE_TO_EVENT(d40c->dma_cfg.dev_type);
1261
1262         /* Enable event line connected to device (or memcpy) */
1263         if ((d40c->dma_cfg.dir == DMA_DEV_TO_MEM) ||
1264             (d40c->dma_cfg.dir == DMA_DEV_TO_DEV))
1265                 __d40_config_set_event(d40c, event_type, event,
1266                                        D40_CHAN_REG_SSLNK);
1267
1268         if (d40c->dma_cfg.dir !=  DMA_DEV_TO_MEM)
1269                 __d40_config_set_event(d40c, event_type, event,
1270                                        D40_CHAN_REG_SDLNK);
1271 }
1272
1273 static u32 d40_chan_has_events(struct d40_chan *d40c)
1274 {
1275         void __iomem *chanbase = chan_base(d40c);
1276         u32 val;
1277
1278         val = readl(chanbase + D40_CHAN_REG_SSLNK);
1279         val |= readl(chanbase + D40_CHAN_REG_SDLNK);
1280
1281         return val;
1282 }
1283
1284 static int
1285 __d40_execute_command_log(struct d40_chan *d40c, enum d40_command command)
1286 {
1287         unsigned long flags;
1288         int ret = 0;
1289         u32 active_status;
1290         void __iomem *active_reg;
1291
1292         if (d40c->phy_chan->num % 2 == 0)
1293                 active_reg = d40c->base->virtbase + D40_DREG_ACTIVE;
1294         else
1295                 active_reg = d40c->base->virtbase + D40_DREG_ACTIVO;
1296
1297
1298         spin_lock_irqsave(&d40c->phy_chan->lock, flags);
1299
1300         switch (command) {
1301         case D40_DMA_STOP:
1302         case D40_DMA_SUSPEND_REQ:
1303
1304                 active_status = (readl(active_reg) &
1305                                  D40_CHAN_POS_MASK(d40c->phy_chan->num)) >>
1306                                  D40_CHAN_POS(d40c->phy_chan->num);
1307
1308                 if (active_status == D40_DMA_RUN)
1309                         d40_config_set_event(d40c, D40_SUSPEND_REQ_EVENTLINE);
1310                 else
1311                         d40_config_set_event(d40c, D40_DEACTIVATE_EVENTLINE);
1312
1313                 if (!d40_chan_has_events(d40c) && (command == D40_DMA_STOP))
1314                         ret = __d40_execute_command_phy(d40c, command);
1315
1316                 break;
1317
1318         case D40_DMA_RUN:
1319
1320                 d40_config_set_event(d40c, D40_ACTIVATE_EVENTLINE);
1321                 ret = __d40_execute_command_phy(d40c, command);
1322                 break;
1323
1324         case D40_DMA_SUSPENDED:
1325                 BUG();
1326                 break;
1327         }
1328
1329         spin_unlock_irqrestore(&d40c->phy_chan->lock, flags);
1330         return ret;
1331 }
1332
1333 static int d40_channel_execute_command(struct d40_chan *d40c,
1334                                        enum d40_command command)
1335 {
1336         if (chan_is_logical(d40c))
1337                 return __d40_execute_command_log(d40c, command);
1338         else
1339                 return __d40_execute_command_phy(d40c, command);
1340 }
1341
1342 static u32 d40_get_prmo(struct d40_chan *d40c)
1343 {
1344         static const unsigned int phy_map[] = {
1345                 [STEDMA40_PCHAN_BASIC_MODE]
1346                         = D40_DREG_PRMO_PCHAN_BASIC,
1347                 [STEDMA40_PCHAN_MODULO_MODE]
1348                         = D40_DREG_PRMO_PCHAN_MODULO,
1349                 [STEDMA40_PCHAN_DOUBLE_DST_MODE]
1350                         = D40_DREG_PRMO_PCHAN_DOUBLE_DST,
1351         };
1352         static const unsigned int log_map[] = {
1353                 [STEDMA40_LCHAN_SRC_PHY_DST_LOG]
1354                         = D40_DREG_PRMO_LCHAN_SRC_PHY_DST_LOG,
1355                 [STEDMA40_LCHAN_SRC_LOG_DST_PHY]
1356                         = D40_DREG_PRMO_LCHAN_SRC_LOG_DST_PHY,
1357                 [STEDMA40_LCHAN_SRC_LOG_DST_LOG]
1358                         = D40_DREG_PRMO_LCHAN_SRC_LOG_DST_LOG,
1359         };
1360
1361         if (chan_is_physical(d40c))
1362                 return phy_map[d40c->dma_cfg.mode_opt];
1363         else
1364                 return log_map[d40c->dma_cfg.mode_opt];
1365 }
1366
1367 static void d40_config_write(struct d40_chan *d40c)
1368 {
1369         u32 addr_base;
1370         u32 var;
1371
1372         /* Odd addresses are even addresses + 4 */
1373         addr_base = (d40c->phy_chan->num % 2) * 4;
1374         /* Setup channel mode to logical or physical */
1375         var = ((u32)(chan_is_logical(d40c)) + 1) <<
1376                 D40_CHAN_POS(d40c->phy_chan->num);
1377         writel(var, d40c->base->virtbase + D40_DREG_PRMSE + addr_base);
1378
1379         /* Setup operational mode option register */
1380         var = d40_get_prmo(d40c) << D40_CHAN_POS(d40c->phy_chan->num);
1381
1382         writel(var, d40c->base->virtbase + D40_DREG_PRMOE + addr_base);
1383
1384         if (chan_is_logical(d40c)) {
1385                 int lidx = (d40c->phy_chan->num << D40_SREG_ELEM_LOG_LIDX_POS)
1386                            & D40_SREG_ELEM_LOG_LIDX_MASK;
1387                 void __iomem *chanbase = chan_base(d40c);
1388
1389                 /* Set default config for CFG reg */
1390                 writel(d40c->src_def_cfg, chanbase + D40_CHAN_REG_SSCFG);
1391                 writel(d40c->dst_def_cfg, chanbase + D40_CHAN_REG_SDCFG);
1392
1393                 /* Set LIDX for lcla */
1394                 writel(lidx, chanbase + D40_CHAN_REG_SSELT);
1395                 writel(lidx, chanbase + D40_CHAN_REG_SDELT);
1396
1397                 /* Clear LNK which will be used by d40_chan_has_events() */
1398                 writel(0, chanbase + D40_CHAN_REG_SSLNK);
1399                 writel(0, chanbase + D40_CHAN_REG_SDLNK);
1400         }
1401 }
1402
1403 static u32 d40_residue(struct d40_chan *d40c)
1404 {
1405         u32 num_elt;
1406
1407         if (chan_is_logical(d40c))
1408                 num_elt = (readl(&d40c->lcpa->lcsp2) & D40_MEM_LCSP2_ECNT_MASK)
1409                         >> D40_MEM_LCSP2_ECNT_POS;
1410         else {
1411                 u32 val = readl(chan_base(d40c) + D40_CHAN_REG_SDELT);
1412                 num_elt = (val & D40_SREG_ELEM_PHY_ECNT_MASK)
1413                           >> D40_SREG_ELEM_PHY_ECNT_POS;
1414         }
1415
1416         return num_elt * d40c->dma_cfg.dst_info.data_width;
1417 }
1418
1419 static bool d40_tx_is_linked(struct d40_chan *d40c)
1420 {
1421         bool is_link;
1422
1423         if (chan_is_logical(d40c))
1424                 is_link = readl(&d40c->lcpa->lcsp3) &  D40_MEM_LCSP3_DLOS_MASK;
1425         else
1426                 is_link = readl(chan_base(d40c) + D40_CHAN_REG_SDLNK)
1427                           & D40_SREG_LNK_PHYS_LNK_MASK;
1428
1429         return is_link;
1430 }
1431
1432 static int d40_pause(struct dma_chan *chan)
1433 {
1434         struct d40_chan *d40c = container_of(chan, struct d40_chan, chan);
1435         int res = 0;
1436         unsigned long flags;
1437
1438         if (d40c->phy_chan == NULL) {
1439                 chan_err(d40c, "Channel is not allocated!\n");
1440                 return -EINVAL;
1441         }
1442
1443         if (!d40c->busy)
1444                 return 0;
1445
1446         spin_lock_irqsave(&d40c->lock, flags);
1447         pm_runtime_get_sync(d40c->base->dev);
1448
1449         res = d40_channel_execute_command(d40c, D40_DMA_SUSPEND_REQ);
1450
1451         pm_runtime_mark_last_busy(d40c->base->dev);
1452         pm_runtime_put_autosuspend(d40c->base->dev);
1453         spin_unlock_irqrestore(&d40c->lock, flags);
1454         return res;
1455 }
1456
1457 static int d40_resume(struct dma_chan *chan)
1458 {
1459         struct d40_chan *d40c = container_of(chan, struct d40_chan, chan);
1460         int res = 0;
1461         unsigned long flags;
1462
1463         if (d40c->phy_chan == NULL) {
1464                 chan_err(d40c, "Channel is not allocated!\n");
1465                 return -EINVAL;
1466         }
1467
1468         if (!d40c->busy)
1469                 return 0;
1470
1471         spin_lock_irqsave(&d40c->lock, flags);
1472         pm_runtime_get_sync(d40c->base->dev);
1473
1474         /* If bytes left to transfer or linked tx resume job */
1475         if (d40_residue(d40c) || d40_tx_is_linked(d40c))
1476                 res = d40_channel_execute_command(d40c, D40_DMA_RUN);
1477
1478         pm_runtime_mark_last_busy(d40c->base->dev);
1479         pm_runtime_put_autosuspend(d40c->base->dev);
1480         spin_unlock_irqrestore(&d40c->lock, flags);
1481         return res;
1482 }
1483
1484 static dma_cookie_t d40_tx_submit(struct dma_async_tx_descriptor *tx)
1485 {
1486         struct d40_chan *d40c = container_of(tx->chan,
1487                                              struct d40_chan,
1488                                              chan);
1489         struct d40_desc *d40d = container_of(tx, struct d40_desc, txd);
1490         unsigned long flags;
1491         dma_cookie_t cookie;
1492
1493         spin_lock_irqsave(&d40c->lock, flags);
1494         cookie = dma_cookie_assign(tx);
1495         d40_desc_queue(d40c, d40d);
1496         spin_unlock_irqrestore(&d40c->lock, flags);
1497
1498         return cookie;
1499 }
1500
1501 static int d40_start(struct d40_chan *d40c)
1502 {
1503         return d40_channel_execute_command(d40c, D40_DMA_RUN);
1504 }
1505
1506 static struct d40_desc *d40_queue_start(struct d40_chan *d40c)
1507 {
1508         struct d40_desc *d40d;
1509         int err;
1510
1511         /* Start queued jobs, if any */
1512         d40d = d40_first_queued(d40c);
1513
1514         if (d40d != NULL) {
1515                 if (!d40c->busy) {
1516                         d40c->busy = true;
1517                         pm_runtime_get_sync(d40c->base->dev);
1518                 }
1519
1520                 /* Remove from queue */
1521                 d40_desc_remove(d40d);
1522
1523                 /* Add to active queue */
1524                 d40_desc_submit(d40c, d40d);
1525
1526                 /* Initiate DMA job */
1527                 d40_desc_load(d40c, d40d);
1528
1529                 /* Start dma job */
1530                 err = d40_start(d40c);
1531
1532                 if (err)
1533                         return NULL;
1534         }
1535
1536         return d40d;
1537 }
1538
1539 /* called from interrupt context */
1540 static void dma_tc_handle(struct d40_chan *d40c)
1541 {
1542         struct d40_desc *d40d;
1543
1544         /* Get first active entry from list */
1545         d40d = d40_first_active_get(d40c);
1546
1547         if (d40d == NULL)
1548                 return;
1549
1550         if (d40d->cyclic) {
1551                 /*
1552                  * If this was a paritially loaded list, we need to reloaded
1553                  * it, and only when the list is completed.  We need to check
1554                  * for done because the interrupt will hit for every link, and
1555                  * not just the last one.
1556                  */
1557                 if (d40d->lli_current < d40d->lli_len
1558                     && !d40_tx_is_linked(d40c)
1559                     && !d40_residue(d40c)) {
1560                         d40_lcla_free_all(d40c, d40d);
1561                         d40_desc_load(d40c, d40d);
1562                         (void) d40_start(d40c);
1563
1564                         if (d40d->lli_current == d40d->lli_len)
1565                                 d40d->lli_current = 0;
1566                 }
1567         } else {
1568                 d40_lcla_free_all(d40c, d40d);
1569
1570                 if (d40d->lli_current < d40d->lli_len) {
1571                         d40_desc_load(d40c, d40d);
1572                         /* Start dma job */
1573                         (void) d40_start(d40c);
1574                         return;
1575                 }
1576
1577                 if (d40_queue_start(d40c) == NULL) {
1578                         d40c->busy = false;
1579
1580                         pm_runtime_mark_last_busy(d40c->base->dev);
1581                         pm_runtime_put_autosuspend(d40c->base->dev);
1582                 }
1583
1584                 d40_desc_remove(d40d);
1585                 d40_desc_done(d40c, d40d);
1586         }
1587
1588         d40c->pending_tx++;
1589         tasklet_schedule(&d40c->tasklet);
1590
1591 }
1592
1593 static void dma_tasklet(unsigned long data)
1594 {
1595         struct d40_chan *d40c = (struct d40_chan *) data;
1596         struct d40_desc *d40d;
1597         unsigned long flags;
1598         bool callback_active;
1599         dma_async_tx_callback callback;
1600         void *callback_param;
1601
1602         spin_lock_irqsave(&d40c->lock, flags);
1603
1604         /* Get first entry from the done list */
1605         d40d = d40_first_done(d40c);
1606         if (d40d == NULL) {
1607                 /* Check if we have reached here for cyclic job */
1608                 d40d = d40_first_active_get(d40c);
1609                 if (d40d == NULL || !d40d->cyclic)
1610                         goto check_pending_tx;
1611         }
1612
1613         if (!d40d->cyclic)
1614                 dma_cookie_complete(&d40d->txd);
1615
1616         /*
1617          * If terminating a channel pending_tx is set to zero.
1618          * This prevents any finished active jobs to return to the client.
1619          */
1620         if (d40c->pending_tx == 0) {
1621                 spin_unlock_irqrestore(&d40c->lock, flags);
1622                 return;
1623         }
1624
1625         /* Callback to client */
1626         callback_active = !!(d40d->txd.flags & DMA_PREP_INTERRUPT);
1627         callback = d40d->txd.callback;
1628         callback_param = d40d->txd.callback_param;
1629
1630         if (!d40d->cyclic) {
1631                 if (async_tx_test_ack(&d40d->txd)) {
1632                         d40_desc_remove(d40d);
1633                         d40_desc_free(d40c, d40d);
1634                 } else if (!d40d->is_in_client_list) {
1635                         d40_desc_remove(d40d);
1636                         d40_lcla_free_all(d40c, d40d);
1637                         list_add_tail(&d40d->node, &d40c->client);
1638                         d40d->is_in_client_list = true;
1639                 }
1640         }
1641
1642         d40c->pending_tx--;
1643
1644         if (d40c->pending_tx)
1645                 tasklet_schedule(&d40c->tasklet);
1646
1647         spin_unlock_irqrestore(&d40c->lock, flags);
1648
1649         if (callback_active && callback)
1650                 callback(callback_param);
1651
1652         return;
1653  check_pending_tx:
1654         /* Rescue manouver if receiving double interrupts */
1655         if (d40c->pending_tx > 0)
1656                 d40c->pending_tx--;
1657         spin_unlock_irqrestore(&d40c->lock, flags);
1658 }
1659
1660 static irqreturn_t d40_handle_interrupt(int irq, void *data)
1661 {
1662         int i;
1663         u32 idx;
1664         u32 row;
1665         long chan = -1;
1666         struct d40_chan *d40c;
1667         unsigned long flags;
1668         struct d40_base *base = data;
1669         u32 regs[base->gen_dmac.il_size];
1670         struct d40_interrupt_lookup *il = base->gen_dmac.il;
1671         u32 il_size = base->gen_dmac.il_size;
1672
1673         spin_lock_irqsave(&base->interrupt_lock, flags);
1674
1675         /* Read interrupt status of both logical and physical channels */
1676         for (i = 0; i < il_size; i++)
1677                 regs[i] = readl(base->virtbase + il[i].src);
1678
1679         for (;;) {
1680
1681                 chan = find_next_bit((unsigned long *)regs,
1682                                      BITS_PER_LONG * il_size, chan + 1);
1683
1684                 /* No more set bits found? */
1685                 if (chan == BITS_PER_LONG * il_size)
1686                         break;
1687
1688                 row = chan / BITS_PER_LONG;
1689                 idx = chan & (BITS_PER_LONG - 1);
1690
1691                 if (il[row].offset == D40_PHY_CHAN)
1692                         d40c = base->lookup_phy_chans[idx];
1693                 else
1694                         d40c = base->lookup_log_chans[il[row].offset + idx];
1695
1696                 if (!d40c) {
1697                         /*
1698                          * No error because this can happen if something else
1699                          * in the system is using the channel.
1700                          */
1701                         continue;
1702                 }
1703
1704                 /* ACK interrupt */
1705                 writel(BIT(idx), base->virtbase + il[row].clr);
1706
1707                 spin_lock(&d40c->lock);
1708
1709                 if (!il[row].is_error)
1710                         dma_tc_handle(d40c);
1711                 else
1712                         d40_err(base->dev, "IRQ chan: %ld offset %d idx %d\n",
1713                                 chan, il[row].offset, idx);
1714
1715                 spin_unlock(&d40c->lock);
1716         }
1717
1718         spin_unlock_irqrestore(&base->interrupt_lock, flags);
1719
1720         return IRQ_HANDLED;
1721 }
1722
1723 static int d40_validate_conf(struct d40_chan *d40c,
1724                              struct stedma40_chan_cfg *conf)
1725 {
1726         int res = 0;
1727         bool is_log = conf->mode == STEDMA40_MODE_LOGICAL;
1728
1729         if (!conf->dir) {
1730                 chan_err(d40c, "Invalid direction.\n");
1731                 res = -EINVAL;
1732         }
1733
1734         if ((is_log && conf->dev_type > d40c->base->num_log_chans)  ||
1735             (!is_log && conf->dev_type > d40c->base->num_phy_chans) ||
1736             (conf->dev_type < 0)) {
1737                 chan_err(d40c, "Invalid device type (%d)\n", conf->dev_type);
1738                 res = -EINVAL;
1739         }
1740
1741         if (conf->dir == DMA_DEV_TO_DEV) {
1742                 /*
1743                  * DMAC HW supports it. Will be added to this driver,
1744                  * in case any dma client requires it.
1745                  */
1746                 chan_err(d40c, "periph to periph not supported\n");
1747                 res = -EINVAL;
1748         }
1749
1750         if (d40_psize_2_burst_size(is_log, conf->src_info.psize) *
1751             conf->src_info.data_width !=
1752             d40_psize_2_burst_size(is_log, conf->dst_info.psize) *
1753             conf->dst_info.data_width) {
1754                 /*
1755                  * The DMAC hardware only supports
1756                  * src (burst x width) == dst (burst x width)
1757                  */
1758
1759                 chan_err(d40c, "src (burst x width) != dst (burst x width)\n");
1760                 res = -EINVAL;
1761         }
1762
1763         return res;
1764 }
1765
1766 static bool d40_alloc_mask_set(struct d40_phy_res *phy,
1767                                bool is_src, int log_event_line, bool is_log,
1768                                bool *first_user)
1769 {
1770         unsigned long flags;
1771         spin_lock_irqsave(&phy->lock, flags);
1772
1773         *first_user = ((phy->allocated_src | phy->allocated_dst)
1774                         == D40_ALLOC_FREE);
1775
1776         if (!is_log) {
1777                 /* Physical interrupts are masked per physical full channel */
1778                 if (phy->allocated_src == D40_ALLOC_FREE &&
1779                     phy->allocated_dst == D40_ALLOC_FREE) {
1780                         phy->allocated_dst = D40_ALLOC_PHY;
1781                         phy->allocated_src = D40_ALLOC_PHY;
1782                         goto found_unlock;
1783                 } else
1784                         goto not_found_unlock;
1785         }
1786
1787         /* Logical channel */
1788         if (is_src) {
1789                 if (phy->allocated_src == D40_ALLOC_PHY)
1790                         goto not_found_unlock;
1791
1792                 if (phy->allocated_src == D40_ALLOC_FREE)
1793                         phy->allocated_src = D40_ALLOC_LOG_FREE;
1794
1795                 if (!(phy->allocated_src & BIT(log_event_line))) {
1796                         phy->allocated_src |= BIT(log_event_line);
1797                         goto found_unlock;
1798                 } else
1799                         goto not_found_unlock;
1800         } else {
1801                 if (phy->allocated_dst == D40_ALLOC_PHY)
1802                         goto not_found_unlock;
1803
1804                 if (phy->allocated_dst == D40_ALLOC_FREE)
1805                         phy->allocated_dst = D40_ALLOC_LOG_FREE;
1806
1807                 if (!(phy->allocated_dst & BIT(log_event_line))) {
1808                         phy->allocated_dst |= BIT(log_event_line);
1809                         goto found_unlock;
1810                 }
1811         }
1812  not_found_unlock:
1813         spin_unlock_irqrestore(&phy->lock, flags);
1814         return false;
1815  found_unlock:
1816         spin_unlock_irqrestore(&phy->lock, flags);
1817         return true;
1818 }
1819
1820 static bool d40_alloc_mask_free(struct d40_phy_res *phy, bool is_src,
1821                                int log_event_line)
1822 {
1823         unsigned long flags;
1824         bool is_free = false;
1825
1826         spin_lock_irqsave(&phy->lock, flags);
1827         if (!log_event_line) {
1828                 phy->allocated_dst = D40_ALLOC_FREE;
1829                 phy->allocated_src = D40_ALLOC_FREE;
1830                 is_free = true;
1831                 goto unlock;
1832         }
1833
1834         /* Logical channel */
1835         if (is_src) {
1836                 phy->allocated_src &= ~BIT(log_event_line);
1837                 if (phy->allocated_src == D40_ALLOC_LOG_FREE)
1838                         phy->allocated_src = D40_ALLOC_FREE;
1839         } else {
1840                 phy->allocated_dst &= ~BIT(log_event_line);
1841                 if (phy->allocated_dst == D40_ALLOC_LOG_FREE)
1842                         phy->allocated_dst = D40_ALLOC_FREE;
1843         }
1844
1845         is_free = ((phy->allocated_src | phy->allocated_dst) ==
1846                    D40_ALLOC_FREE);
1847  unlock:
1848         spin_unlock_irqrestore(&phy->lock, flags);
1849
1850         return is_free;
1851 }
1852
1853 static int d40_allocate_channel(struct d40_chan *d40c, bool *first_phy_user)
1854 {
1855         int dev_type = d40c->dma_cfg.dev_type;
1856         int event_group;
1857         int event_line;
1858         struct d40_phy_res *phys;
1859         int i;
1860         int j;
1861         int log_num;
1862         int num_phy_chans;
1863         bool is_src;
1864         bool is_log = d40c->dma_cfg.mode == STEDMA40_MODE_LOGICAL;
1865
1866         phys = d40c->base->phy_res;
1867         num_phy_chans = d40c->base->num_phy_chans;
1868
1869         if (d40c->dma_cfg.dir == DMA_DEV_TO_MEM) {
1870                 log_num = 2 * dev_type;
1871                 is_src = true;
1872         } else if (d40c->dma_cfg.dir == DMA_MEM_TO_DEV ||
1873                    d40c->dma_cfg.dir == DMA_MEM_TO_MEM) {
1874                 /* dst event lines are used for logical memcpy */
1875                 log_num = 2 * dev_type + 1;
1876                 is_src = false;
1877         } else
1878                 return -EINVAL;
1879
1880         event_group = D40_TYPE_TO_GROUP(dev_type);
1881         event_line = D40_TYPE_TO_EVENT(dev_type);
1882
1883         if (!is_log) {
1884                 if (d40c->dma_cfg.dir == DMA_MEM_TO_MEM) {
1885                         /* Find physical half channel */
1886                         if (d40c->dma_cfg.use_fixed_channel) {
1887                                 i = d40c->dma_cfg.phy_channel;
1888                                 if (d40_alloc_mask_set(&phys[i], is_src,
1889                                                        0, is_log,
1890                                                        first_phy_user))
1891                                         goto found_phy;
1892                         } else {
1893                                 for (i = 0; i < num_phy_chans; i++) {
1894                                         if (d40_alloc_mask_set(&phys[i], is_src,
1895                                                        0, is_log,
1896                                                        first_phy_user))
1897                                                 goto found_phy;
1898                                 }
1899                         }
1900                 } else
1901                         for (j = 0; j < d40c->base->num_phy_chans; j += 8) {
1902                                 int phy_num = j  + event_group * 2;
1903                                 for (i = phy_num; i < phy_num + 2; i++) {
1904                                         if (d40_alloc_mask_set(&phys[i],
1905                                                                is_src,
1906                                                                0,
1907                                                                is_log,
1908                                                                first_phy_user))
1909                                                 goto found_phy;
1910                                 }
1911                         }
1912                 return -EINVAL;
1913 found_phy:
1914                 d40c->phy_chan = &phys[i];
1915                 d40c->log_num = D40_PHY_CHAN;
1916                 goto out;
1917         }
1918         if (dev_type == -1)
1919                 return -EINVAL;
1920
1921         /* Find logical channel */
1922         for (j = 0; j < d40c->base->num_phy_chans; j += 8) {
1923                 int phy_num = j + event_group * 2;
1924
1925                 if (d40c->dma_cfg.use_fixed_channel) {
1926                         i = d40c->dma_cfg.phy_channel;
1927
1928                         if ((i != phy_num) && (i != phy_num + 1)) {
1929                                 dev_err(chan2dev(d40c),
1930                                         "invalid fixed phy channel %d\n", i);
1931                                 return -EINVAL;
1932                         }
1933
1934                         if (d40_alloc_mask_set(&phys[i], is_src, event_line,
1935                                                is_log, first_phy_user))
1936                                 goto found_log;
1937
1938                         dev_err(chan2dev(d40c),
1939                                 "could not allocate fixed phy channel %d\n", i);
1940                         return -EINVAL;
1941                 }
1942
1943                 /*
1944                  * Spread logical channels across all available physical rather
1945                  * than pack every logical channel at the first available phy
1946                  * channels.
1947                  */
1948                 if (is_src) {
1949                         for (i = phy_num; i < phy_num + 2; i++) {
1950                                 if (d40_alloc_mask_set(&phys[i], is_src,
1951                                                        event_line, is_log,
1952                                                        first_phy_user))
1953                                         goto found_log;
1954                         }
1955                 } else {
1956                         for (i = phy_num + 1; i >= phy_num; i--) {
1957                                 if (d40_alloc_mask_set(&phys[i], is_src,
1958                                                        event_line, is_log,
1959                                                        first_phy_user))
1960                                         goto found_log;
1961                         }
1962                 }
1963         }
1964         return -EINVAL;
1965
1966 found_log:
1967         d40c->phy_chan = &phys[i];
1968         d40c->log_num = log_num;
1969 out:
1970
1971         if (is_log)
1972                 d40c->base->lookup_log_chans[d40c->log_num] = d40c;
1973         else
1974                 d40c->base->lookup_phy_chans[d40c->phy_chan->num] = d40c;
1975
1976         return 0;
1977
1978 }
1979
1980 static int d40_config_memcpy(struct d40_chan *d40c)
1981 {
1982         dma_cap_mask_t cap = d40c->chan.device->cap_mask;
1983
1984         if (dma_has_cap(DMA_MEMCPY, cap) && !dma_has_cap(DMA_SLAVE, cap)) {
1985                 d40c->dma_cfg = dma40_memcpy_conf_log;
1986                 d40c->dma_cfg.dev_type = dma40_memcpy_channels[d40c->chan.chan_id];
1987
1988                 d40_log_cfg(&d40c->dma_cfg,
1989                             &d40c->log_def.lcsp1, &d40c->log_def.lcsp3);
1990
1991         } else if (dma_has_cap(DMA_MEMCPY, cap) &&
1992                    dma_has_cap(DMA_SLAVE, cap)) {
1993                 d40c->dma_cfg = dma40_memcpy_conf_phy;
1994
1995                 /* Generate interrrupt at end of transfer or relink. */
1996                 d40c->dst_def_cfg |= BIT(D40_SREG_CFG_TIM_POS);
1997
1998                 /* Generate interrupt on error. */
1999                 d40c->src_def_cfg |= BIT(D40_SREG_CFG_EIM_POS);
2000                 d40c->dst_def_cfg |= BIT(D40_SREG_CFG_EIM_POS);
2001
2002         } else {
2003                 chan_err(d40c, "No memcpy\n");
2004                 return -EINVAL;
2005         }
2006
2007         return 0;
2008 }
2009
2010 static int d40_free_dma(struct d40_chan *d40c)
2011 {
2012
2013         int res = 0;
2014         u32 event = D40_TYPE_TO_EVENT(d40c->dma_cfg.dev_type);
2015         struct d40_phy_res *phy = d40c->phy_chan;
2016         bool is_src;
2017
2018         /* Terminate all queued and active transfers */
2019         d40_term_all(d40c);
2020
2021         if (phy == NULL) {
2022                 chan_err(d40c, "phy == null\n");
2023                 return -EINVAL;
2024         }
2025
2026         if (phy->allocated_src == D40_ALLOC_FREE &&
2027             phy->allocated_dst == D40_ALLOC_FREE) {
2028                 chan_err(d40c, "channel already free\n");
2029                 return -EINVAL;
2030         }
2031
2032         if (d40c->dma_cfg.dir == DMA_MEM_TO_DEV ||
2033             d40c->dma_cfg.dir == DMA_MEM_TO_MEM)
2034                 is_src = false;
2035         else if (d40c->dma_cfg.dir == DMA_DEV_TO_MEM)
2036                 is_src = true;
2037         else {
2038                 chan_err(d40c, "Unknown direction\n");
2039                 return -EINVAL;
2040         }
2041
2042         pm_runtime_get_sync(d40c->base->dev);
2043         res = d40_channel_execute_command(d40c, D40_DMA_STOP);
2044         if (res) {
2045                 chan_err(d40c, "stop failed\n");
2046                 goto mark_last_busy;
2047         }
2048
2049         d40_alloc_mask_free(phy, is_src, chan_is_logical(d40c) ? event : 0);
2050
2051         if (chan_is_logical(d40c))
2052                 d40c->base->lookup_log_chans[d40c->log_num] = NULL;
2053         else
2054                 d40c->base->lookup_phy_chans[phy->num] = NULL;
2055
2056         if (d40c->busy) {
2057                 pm_runtime_mark_last_busy(d40c->base->dev);
2058                 pm_runtime_put_autosuspend(d40c->base->dev);
2059         }
2060
2061         d40c->busy = false;
2062         d40c->phy_chan = NULL;
2063         d40c->configured = false;
2064  mark_last_busy:
2065         pm_runtime_mark_last_busy(d40c->base->dev);
2066         pm_runtime_put_autosuspend(d40c->base->dev);
2067         return res;
2068 }
2069
2070 static bool d40_is_paused(struct d40_chan *d40c)
2071 {
2072         void __iomem *chanbase = chan_base(d40c);
2073         bool is_paused = false;
2074         unsigned long flags;
2075         void __iomem *active_reg;
2076         u32 status;
2077         u32 event = D40_TYPE_TO_EVENT(d40c->dma_cfg.dev_type);
2078
2079         spin_lock_irqsave(&d40c->lock, flags);
2080
2081         if (chan_is_physical(d40c)) {
2082                 if (d40c->phy_chan->num % 2 == 0)
2083                         active_reg = d40c->base->virtbase + D40_DREG_ACTIVE;
2084                 else
2085                         active_reg = d40c->base->virtbase + D40_DREG_ACTIVO;
2086
2087                 status = (readl(active_reg) &
2088                           D40_CHAN_POS_MASK(d40c->phy_chan->num)) >>
2089                         D40_CHAN_POS(d40c->phy_chan->num);
2090                 if (status == D40_DMA_SUSPENDED || status == D40_DMA_STOP)
2091                         is_paused = true;
2092                 goto unlock;
2093         }
2094
2095         if (d40c->dma_cfg.dir == DMA_MEM_TO_DEV ||
2096             d40c->dma_cfg.dir == DMA_MEM_TO_MEM) {
2097                 status = readl(chanbase + D40_CHAN_REG_SDLNK);
2098         } else if (d40c->dma_cfg.dir == DMA_DEV_TO_MEM) {
2099                 status = readl(chanbase + D40_CHAN_REG_SSLNK);
2100         } else {
2101                 chan_err(d40c, "Unknown direction\n");
2102                 goto unlock;
2103         }
2104
2105         status = (status & D40_EVENTLINE_MASK(event)) >>
2106                 D40_EVENTLINE_POS(event);
2107
2108         if (status != D40_DMA_RUN)
2109                 is_paused = true;
2110  unlock:
2111         spin_unlock_irqrestore(&d40c->lock, flags);
2112         return is_paused;
2113
2114 }
2115
2116 static u32 stedma40_residue(struct dma_chan *chan)
2117 {
2118         struct d40_chan *d40c =
2119                 container_of(chan, struct d40_chan, chan);
2120         u32 bytes_left;
2121         unsigned long flags;
2122
2123         spin_lock_irqsave(&d40c->lock, flags);
2124         bytes_left = d40_residue(d40c);
2125         spin_unlock_irqrestore(&d40c->lock, flags);
2126
2127         return bytes_left;
2128 }
2129
2130 static int
2131 d40_prep_sg_log(struct d40_chan *chan, struct d40_desc *desc,
2132                 struct scatterlist *sg_src, struct scatterlist *sg_dst,
2133                 unsigned int sg_len, dma_addr_t src_dev_addr,
2134                 dma_addr_t dst_dev_addr)
2135 {
2136         struct stedma40_chan_cfg *cfg = &chan->dma_cfg;
2137         struct stedma40_half_channel_info *src_info = &cfg->src_info;
2138         struct stedma40_half_channel_info *dst_info = &cfg->dst_info;
2139         int ret;
2140
2141         ret = d40_log_sg_to_lli(sg_src, sg_len,
2142                                 src_dev_addr,
2143                                 desc->lli_log.src,
2144                                 chan->log_def.lcsp1,
2145                                 src_info->data_width,
2146                                 dst_info->data_width);
2147
2148         ret = d40_log_sg_to_lli(sg_dst, sg_len,
2149                                 dst_dev_addr,
2150                                 desc->lli_log.dst,
2151                                 chan->log_def.lcsp3,
2152                                 dst_info->data_width,
2153                                 src_info->data_width);
2154
2155         return ret < 0 ? ret : 0;
2156 }
2157
2158 static int
2159 d40_prep_sg_phy(struct d40_chan *chan, struct d40_desc *desc,
2160                 struct scatterlist *sg_src, struct scatterlist *sg_dst,
2161                 unsigned int sg_len, dma_addr_t src_dev_addr,
2162                 dma_addr_t dst_dev_addr)
2163 {
2164         struct stedma40_chan_cfg *cfg = &chan->dma_cfg;
2165         struct stedma40_half_channel_info *src_info = &cfg->src_info;
2166         struct stedma40_half_channel_info *dst_info = &cfg->dst_info;
2167         unsigned long flags = 0;
2168         int ret;
2169
2170         if (desc->cyclic)
2171                 flags |= LLI_CYCLIC | LLI_TERM_INT;
2172
2173         ret = d40_phy_sg_to_lli(sg_src, sg_len, src_dev_addr,
2174                                 desc->lli_phy.src,
2175                                 virt_to_phys(desc->lli_phy.src),
2176                                 chan->src_def_cfg,
2177                                 src_info, dst_info, flags);
2178
2179         ret = d40_phy_sg_to_lli(sg_dst, sg_len, dst_dev_addr,
2180                                 desc->lli_phy.dst,
2181                                 virt_to_phys(desc->lli_phy.dst),
2182                                 chan->dst_def_cfg,
2183                                 dst_info, src_info, flags);
2184
2185         dma_sync_single_for_device(chan->base->dev, desc->lli_pool.dma_addr,
2186                                    desc->lli_pool.size, DMA_TO_DEVICE);
2187
2188         return ret < 0 ? ret : 0;
2189 }
2190
2191 static struct d40_desc *
2192 d40_prep_desc(struct d40_chan *chan, struct scatterlist *sg,
2193               unsigned int sg_len, unsigned long dma_flags)
2194 {
2195         struct stedma40_chan_cfg *cfg;
2196         struct d40_desc *desc;
2197         int ret;
2198
2199         desc = d40_desc_get(chan);
2200         if (!desc)
2201                 return NULL;
2202
2203         cfg = &chan->dma_cfg;
2204         desc->lli_len = d40_sg_2_dmalen(sg, sg_len, cfg->src_info.data_width,
2205                                         cfg->dst_info.data_width);
2206         if (desc->lli_len < 0) {
2207                 chan_err(chan, "Unaligned size\n");
2208                 goto free_desc;
2209         }
2210
2211         ret = d40_pool_lli_alloc(chan, desc, desc->lli_len);
2212         if (ret < 0) {
2213                 chan_err(chan, "Could not allocate lli\n");
2214                 goto free_desc;
2215         }
2216
2217         desc->lli_current = 0;
2218         desc->txd.flags = dma_flags;
2219         desc->txd.tx_submit = d40_tx_submit;
2220
2221         dma_async_tx_descriptor_init(&desc->txd, &chan->chan);
2222
2223         return desc;
2224  free_desc:
2225         d40_desc_free(chan, desc);
2226         return NULL;
2227 }
2228
2229 static struct dma_async_tx_descriptor *
2230 d40_prep_sg(struct dma_chan *dchan, struct scatterlist *sg_src,
2231             struct scatterlist *sg_dst, unsigned int sg_len,
2232             enum dma_transfer_direction direction, unsigned long dma_flags)
2233 {
2234         struct d40_chan *chan = container_of(dchan, struct d40_chan, chan);
2235         dma_addr_t src_dev_addr;
2236         dma_addr_t dst_dev_addr;
2237         struct d40_desc *desc;
2238         unsigned long flags;
2239         int ret;
2240
2241         if (!chan->phy_chan) {
2242                 chan_err(chan, "Cannot prepare unallocated channel\n");
2243                 return NULL;
2244         }
2245
2246         spin_lock_irqsave(&chan->lock, flags);
2247
2248         desc = d40_prep_desc(chan, sg_src, sg_len, dma_flags);
2249         if (desc == NULL)
2250                 goto unlock;
2251
2252         if (sg_next(&sg_src[sg_len - 1]) == sg_src)
2253                 desc->cyclic = true;
2254
2255         src_dev_addr = 0;
2256         dst_dev_addr = 0;
2257         if (direction == DMA_DEV_TO_MEM)
2258                 src_dev_addr = chan->runtime_addr;
2259         else if (direction == DMA_MEM_TO_DEV)
2260                 dst_dev_addr = chan->runtime_addr;
2261
2262         if (chan_is_logical(chan))
2263                 ret = d40_prep_sg_log(chan, desc, sg_src, sg_dst,
2264                                       sg_len, src_dev_addr, dst_dev_addr);
2265         else
2266                 ret = d40_prep_sg_phy(chan, desc, sg_src, sg_dst,
2267                                       sg_len, src_dev_addr, dst_dev_addr);
2268
2269         if (ret) {
2270                 chan_err(chan, "Failed to prepare %s sg job: %d\n",
2271                          chan_is_logical(chan) ? "log" : "phy", ret);
2272                 goto free_desc;
2273         }
2274
2275         /*
2276          * add descriptor to the prepare queue in order to be able
2277          * to free them later in terminate_all
2278          */
2279         list_add_tail(&desc->node, &chan->prepare_queue);
2280
2281         spin_unlock_irqrestore(&chan->lock, flags);
2282
2283         return &desc->txd;
2284  free_desc:
2285         d40_desc_free(chan, desc);
2286  unlock:
2287         spin_unlock_irqrestore(&chan->lock, flags);
2288         return NULL;
2289 }
2290
2291 bool stedma40_filter(struct dma_chan *chan, void *data)
2292 {
2293         struct stedma40_chan_cfg *info = data;
2294         struct d40_chan *d40c =
2295                 container_of(chan, struct d40_chan, chan);
2296         int err;
2297
2298         if (data) {
2299                 err = d40_validate_conf(d40c, info);
2300                 if (!err)
2301                         d40c->dma_cfg = *info;
2302         } else
2303                 err = d40_config_memcpy(d40c);
2304
2305         if (!err)
2306                 d40c->configured = true;
2307
2308         return err == 0;
2309 }
2310 EXPORT_SYMBOL(stedma40_filter);
2311
2312 static void __d40_set_prio_rt(struct d40_chan *d40c, int dev_type, bool src)
2313 {
2314         bool realtime = d40c->dma_cfg.realtime;
2315         bool highprio = d40c->dma_cfg.high_priority;
2316         u32 rtreg;
2317         u32 event = D40_TYPE_TO_EVENT(dev_type);
2318         u32 group = D40_TYPE_TO_GROUP(dev_type);
2319         u32 bit = BIT(event);
2320         u32 prioreg;
2321         struct d40_gen_dmac *dmac = &d40c->base->gen_dmac;
2322
2323         rtreg = realtime ? dmac->realtime_en : dmac->realtime_clear;
2324         /*
2325          * Due to a hardware bug, in some cases a logical channel triggered by
2326          * a high priority destination event line can generate extra packet
2327          * transactions.
2328          *
2329          * The workaround is to not set the high priority level for the
2330          * destination event lines that trigger logical channels.
2331          */
2332         if (!src && chan_is_logical(d40c))
2333                 highprio = false;
2334
2335         prioreg = highprio ? dmac->high_prio_en : dmac->high_prio_clear;
2336
2337         /* Destination event lines are stored in the upper halfword */
2338         if (!src)
2339                 bit <<= 16;
2340
2341         writel(bit, d40c->base->virtbase + prioreg + group * 4);
2342         writel(bit, d40c->base->virtbase + rtreg + group * 4);
2343 }
2344
2345 static void d40_set_prio_realtime(struct d40_chan *d40c)
2346 {
2347         if (d40c->base->rev < 3)
2348                 return;
2349
2350         if ((d40c->dma_cfg.dir ==  DMA_DEV_TO_MEM) ||
2351             (d40c->dma_cfg.dir == DMA_DEV_TO_DEV))
2352                 __d40_set_prio_rt(d40c, d40c->dma_cfg.dev_type, true);
2353
2354         if ((d40c->dma_cfg.dir ==  DMA_MEM_TO_DEV) ||
2355             (d40c->dma_cfg.dir == DMA_DEV_TO_DEV))
2356                 __d40_set_prio_rt(d40c, d40c->dma_cfg.dev_type, false);
2357 }
2358
2359 #define D40_DT_FLAGS_MODE(flags)       ((flags >> 0) & 0x1)
2360 #define D40_DT_FLAGS_DIR(flags)        ((flags >> 1) & 0x1)
2361 #define D40_DT_FLAGS_BIG_ENDIAN(flags) ((flags >> 2) & 0x1)
2362 #define D40_DT_FLAGS_FIXED_CHAN(flags) ((flags >> 3) & 0x1)
2363 #define D40_DT_FLAGS_HIGH_PRIO(flags)  ((flags >> 4) & 0x1)
2364
2365 static struct dma_chan *d40_xlate(struct of_phandle_args *dma_spec,
2366                                   struct of_dma *ofdma)
2367 {
2368         struct stedma40_chan_cfg cfg;
2369         dma_cap_mask_t cap;
2370         u32 flags;
2371
2372         memset(&cfg, 0, sizeof(struct stedma40_chan_cfg));
2373
2374         dma_cap_zero(cap);
2375         dma_cap_set(DMA_SLAVE, cap);
2376
2377         cfg.dev_type = dma_spec->args[0];
2378         flags = dma_spec->args[2];
2379
2380         switch (D40_DT_FLAGS_MODE(flags)) {
2381         case 0: cfg.mode = STEDMA40_MODE_LOGICAL; break;
2382         case 1: cfg.mode = STEDMA40_MODE_PHYSICAL; break;
2383         }
2384
2385         switch (D40_DT_FLAGS_DIR(flags)) {
2386         case 0:
2387                 cfg.dir = DMA_MEM_TO_DEV;
2388                 cfg.dst_info.big_endian = D40_DT_FLAGS_BIG_ENDIAN(flags);
2389                 break;
2390         case 1:
2391                 cfg.dir = DMA_DEV_TO_MEM;
2392                 cfg.src_info.big_endian = D40_DT_FLAGS_BIG_ENDIAN(flags);
2393                 break;
2394         }
2395
2396         if (D40_DT_FLAGS_FIXED_CHAN(flags)) {
2397                 cfg.phy_channel = dma_spec->args[1];
2398                 cfg.use_fixed_channel = true;
2399         }
2400
2401         if (D40_DT_FLAGS_HIGH_PRIO(flags))
2402                 cfg.high_priority = true;
2403
2404         return dma_request_channel(cap, stedma40_filter, &cfg);
2405 }
2406
2407 /* DMA ENGINE functions */
2408 static int d40_alloc_chan_resources(struct dma_chan *chan)
2409 {
2410         int err;
2411         unsigned long flags;
2412         struct d40_chan *d40c =
2413                 container_of(chan, struct d40_chan, chan);
2414         bool is_free_phy;
2415         spin_lock_irqsave(&d40c->lock, flags);
2416
2417         dma_cookie_init(chan);
2418
2419         /* If no dma configuration is set use default configuration (memcpy) */
2420         if (!d40c->configured) {
2421                 err = d40_config_memcpy(d40c);
2422                 if (err) {
2423                         chan_err(d40c, "Failed to configure memcpy channel\n");
2424                         goto mark_last_busy;
2425                 }
2426         }
2427
2428         err = d40_allocate_channel(d40c, &is_free_phy);
2429         if (err) {
2430                 chan_err(d40c, "Failed to allocate channel\n");
2431                 d40c->configured = false;
2432                 goto mark_last_busy;
2433         }
2434
2435         pm_runtime_get_sync(d40c->base->dev);
2436
2437         d40_set_prio_realtime(d40c);
2438
2439         if (chan_is_logical(d40c)) {
2440                 if (d40c->dma_cfg.dir == DMA_DEV_TO_MEM)
2441                         d40c->lcpa = d40c->base->lcpa_base +
2442                                 d40c->dma_cfg.dev_type * D40_LCPA_CHAN_SIZE;
2443                 else
2444                         d40c->lcpa = d40c->base->lcpa_base +
2445                                 d40c->dma_cfg.dev_type *
2446                                 D40_LCPA_CHAN_SIZE + D40_LCPA_CHAN_DST_DELTA;
2447
2448                 /* Unmask the Global Interrupt Mask. */
2449                 d40c->src_def_cfg |= BIT(D40_SREG_CFG_LOG_GIM_POS);
2450                 d40c->dst_def_cfg |= BIT(D40_SREG_CFG_LOG_GIM_POS);
2451         }
2452
2453         dev_dbg(chan2dev(d40c), "allocated %s channel (phy %d%s)\n",
2454                  chan_is_logical(d40c) ? "logical" : "physical",
2455                  d40c->phy_chan->num,
2456                  d40c->dma_cfg.use_fixed_channel ? ", fixed" : "");
2457
2458
2459         /*
2460          * Only write channel configuration to the DMA if the physical
2461          * resource is free. In case of multiple logical channels
2462          * on the same physical resource, only the first write is necessary.
2463          */
2464         if (is_free_phy)
2465                 d40_config_write(d40c);
2466  mark_last_busy:
2467         pm_runtime_mark_last_busy(d40c->base->dev);
2468         pm_runtime_put_autosuspend(d40c->base->dev);
2469         spin_unlock_irqrestore(&d40c->lock, flags);
2470         return err;
2471 }
2472
2473 static void d40_free_chan_resources(struct dma_chan *chan)
2474 {
2475         struct d40_chan *d40c =
2476                 container_of(chan, struct d40_chan, chan);
2477         int err;
2478         unsigned long flags;
2479
2480         if (d40c->phy_chan == NULL) {
2481                 chan_err(d40c, "Cannot free unallocated channel\n");
2482                 return;
2483         }
2484
2485         spin_lock_irqsave(&d40c->lock, flags);
2486
2487         err = d40_free_dma(d40c);
2488
2489         if (err)
2490                 chan_err(d40c, "Failed to free channel\n");
2491         spin_unlock_irqrestore(&d40c->lock, flags);
2492 }
2493
2494 static struct dma_async_tx_descriptor *d40_prep_memcpy(struct dma_chan *chan,
2495                                                        dma_addr_t dst,
2496                                                        dma_addr_t src,
2497                                                        size_t size,
2498                                                        unsigned long dma_flags)
2499 {
2500         struct scatterlist dst_sg;
2501         struct scatterlist src_sg;
2502
2503         sg_init_table(&dst_sg, 1);
2504         sg_init_table(&src_sg, 1);
2505
2506         sg_dma_address(&dst_sg) = dst;
2507         sg_dma_address(&src_sg) = src;
2508
2509         sg_dma_len(&dst_sg) = size;
2510         sg_dma_len(&src_sg) = size;
2511
2512         return d40_prep_sg(chan, &src_sg, &dst_sg, 1,
2513                            DMA_MEM_TO_MEM, dma_flags);
2514 }
2515
2516 static struct dma_async_tx_descriptor *
2517 d40_prep_memcpy_sg(struct dma_chan *chan,
2518                    struct scatterlist *dst_sg, unsigned int dst_nents,
2519                    struct scatterlist *src_sg, unsigned int src_nents,
2520                    unsigned long dma_flags)
2521 {
2522         if (dst_nents != src_nents)
2523                 return NULL;
2524
2525         return d40_prep_sg(chan, src_sg, dst_sg, src_nents,
2526                            DMA_MEM_TO_MEM, dma_flags);
2527 }
2528
2529 static struct dma_async_tx_descriptor *
2530 d40_prep_slave_sg(struct dma_chan *chan, struct scatterlist *sgl,
2531                   unsigned int sg_len, enum dma_transfer_direction direction,
2532                   unsigned long dma_flags, void *context)
2533 {
2534         if (!is_slave_direction(direction))
2535                 return NULL;
2536
2537         return d40_prep_sg(chan, sgl, sgl, sg_len, direction, dma_flags);
2538 }
2539
2540 static struct dma_async_tx_descriptor *
2541 dma40_prep_dma_cyclic(struct dma_chan *chan, dma_addr_t dma_addr,
2542                      size_t buf_len, size_t period_len,
2543                      enum dma_transfer_direction direction, unsigned long flags)
2544 {
2545         unsigned int periods = buf_len / period_len;
2546         struct dma_async_tx_descriptor *txd;
2547         struct scatterlist *sg;
2548         int i;
2549
2550         sg = kcalloc(periods + 1, sizeof(struct scatterlist), GFP_NOWAIT);
2551         if (!sg)
2552                 return NULL;
2553
2554         for (i = 0; i < periods; i++) {
2555                 sg_dma_address(&sg[i]) = dma_addr;
2556                 sg_dma_len(&sg[i]) = period_len;
2557                 dma_addr += period_len;
2558         }
2559
2560         sg[periods].offset = 0;
2561         sg_dma_len(&sg[periods]) = 0;
2562         sg[periods].page_link =
2563                 ((unsigned long)sg | 0x01) & ~0x02;
2564
2565         txd = d40_prep_sg(chan, sg, sg, periods, direction,
2566                           DMA_PREP_INTERRUPT);
2567
2568         kfree(sg);
2569
2570         return txd;
2571 }
2572
2573 static enum dma_status d40_tx_status(struct dma_chan *chan,
2574                                      dma_cookie_t cookie,
2575                                      struct dma_tx_state *txstate)
2576 {
2577         struct d40_chan *d40c = container_of(chan, struct d40_chan, chan);
2578         enum dma_status ret;
2579
2580         if (d40c->phy_chan == NULL) {
2581                 chan_err(d40c, "Cannot read status of unallocated channel\n");
2582                 return -EINVAL;
2583         }
2584
2585         ret = dma_cookie_status(chan, cookie, txstate);
2586         if (ret != DMA_COMPLETE && txstate)
2587                 dma_set_residue(txstate, stedma40_residue(chan));
2588
2589         if (d40_is_paused(d40c))
2590                 ret = DMA_PAUSED;
2591
2592         return ret;
2593 }
2594
2595 static void d40_issue_pending(struct dma_chan *chan)
2596 {
2597         struct d40_chan *d40c = container_of(chan, struct d40_chan, chan);
2598         unsigned long flags;
2599
2600         if (d40c->phy_chan == NULL) {
2601                 chan_err(d40c, "Channel is not allocated!\n");
2602                 return;
2603         }
2604
2605         spin_lock_irqsave(&d40c->lock, flags);
2606
2607         list_splice_tail_init(&d40c->pending_queue, &d40c->queue);
2608
2609         /* Busy means that queued jobs are already being processed */
2610         if (!d40c->busy)
2611                 (void) d40_queue_start(d40c);
2612
2613         spin_unlock_irqrestore(&d40c->lock, flags);
2614 }
2615
2616 static int d40_terminate_all(struct dma_chan *chan)
2617 {
2618         unsigned long flags;
2619         struct d40_chan *d40c = container_of(chan, struct d40_chan, chan);
2620         int ret;
2621
2622         if (d40c->phy_chan == NULL) {
2623                 chan_err(d40c, "Channel is not allocated!\n");
2624                 return -EINVAL;
2625         }
2626
2627         spin_lock_irqsave(&d40c->lock, flags);
2628
2629         pm_runtime_get_sync(d40c->base->dev);
2630         ret = d40_channel_execute_command(d40c, D40_DMA_STOP);
2631         if (ret)
2632                 chan_err(d40c, "Failed to stop channel\n");
2633
2634         d40_term_all(d40c);
2635         pm_runtime_mark_last_busy(d40c->base->dev);
2636         pm_runtime_put_autosuspend(d40c->base->dev);
2637         if (d40c->busy) {
2638                 pm_runtime_mark_last_busy(d40c->base->dev);
2639                 pm_runtime_put_autosuspend(d40c->base->dev);
2640         }
2641         d40c->busy = false;
2642
2643         spin_unlock_irqrestore(&d40c->lock, flags);
2644         return 0;
2645 }
2646
2647 static int
2648 dma40_config_to_halfchannel(struct d40_chan *d40c,
2649                             struct stedma40_half_channel_info *info,
2650                             u32 maxburst)
2651 {
2652         int psize;
2653
2654         if (chan_is_logical(d40c)) {
2655                 if (maxburst >= 16)
2656                         psize = STEDMA40_PSIZE_LOG_16;
2657                 else if (maxburst >= 8)
2658                         psize = STEDMA40_PSIZE_LOG_8;
2659                 else if (maxburst >= 4)
2660                         psize = STEDMA40_PSIZE_LOG_4;
2661                 else
2662                         psize = STEDMA40_PSIZE_LOG_1;
2663         } else {
2664                 if (maxburst >= 16)
2665                         psize = STEDMA40_PSIZE_PHY_16;
2666                 else if (maxburst >= 8)
2667                         psize = STEDMA40_PSIZE_PHY_8;
2668                 else if (maxburst >= 4)
2669                         psize = STEDMA40_PSIZE_PHY_4;
2670                 else
2671                         psize = STEDMA40_PSIZE_PHY_1;
2672         }
2673
2674         info->psize = psize;
2675         info->flow_ctrl = STEDMA40_NO_FLOW_CTRL;
2676
2677         return 0;
2678 }
2679
2680 /* Runtime reconfiguration extension */
2681 static int d40_set_runtime_config(struct dma_chan *chan,
2682                                   struct dma_slave_config *config)
2683 {
2684         struct d40_chan *d40c = container_of(chan, struct d40_chan, chan);
2685         struct stedma40_chan_cfg *cfg = &d40c->dma_cfg;
2686         enum dma_slave_buswidth src_addr_width, dst_addr_width;
2687         dma_addr_t config_addr;
2688         u32 src_maxburst, dst_maxburst;
2689         int ret;
2690
2691         if (d40c->phy_chan == NULL) {
2692                 chan_err(d40c, "Channel is not allocated!\n");
2693                 return -EINVAL;
2694         }
2695
2696         src_addr_width = config->src_addr_width;
2697         src_maxburst = config->src_maxburst;
2698         dst_addr_width = config->dst_addr_width;
2699         dst_maxburst = config->dst_maxburst;
2700
2701         if (config->direction == DMA_DEV_TO_MEM) {
2702                 config_addr = config->src_addr;
2703
2704                 if (cfg->dir != DMA_DEV_TO_MEM)
2705                         dev_dbg(d40c->base->dev,
2706                                 "channel was not configured for peripheral "
2707                                 "to memory transfer (%d) overriding\n",
2708                                 cfg->dir);
2709                 cfg->dir = DMA_DEV_TO_MEM;
2710
2711                 /* Configure the memory side */
2712                 if (dst_addr_width == DMA_SLAVE_BUSWIDTH_UNDEFINED)
2713                         dst_addr_width = src_addr_width;
2714                 if (dst_maxburst == 0)
2715                         dst_maxburst = src_maxburst;
2716
2717         } else if (config->direction == DMA_MEM_TO_DEV) {
2718                 config_addr = config->dst_addr;
2719
2720                 if (cfg->dir != DMA_MEM_TO_DEV)
2721                         dev_dbg(d40c->base->dev,
2722                                 "channel was not configured for memory "
2723                                 "to peripheral transfer (%d) overriding\n",
2724                                 cfg->dir);
2725                 cfg->dir = DMA_MEM_TO_DEV;
2726
2727                 /* Configure the memory side */
2728                 if (src_addr_width == DMA_SLAVE_BUSWIDTH_UNDEFINED)
2729                         src_addr_width = dst_addr_width;
2730                 if (src_maxburst == 0)
2731                         src_maxburst = dst_maxburst;
2732         } else {
2733                 dev_err(d40c->base->dev,
2734                         "unrecognized channel direction %d\n",
2735                         config->direction);
2736                 return -EINVAL;
2737         }
2738
2739         if (config_addr <= 0) {
2740                 dev_err(d40c->base->dev, "no address supplied\n");
2741                 return -EINVAL;
2742         }
2743
2744         if (src_maxburst * src_addr_width != dst_maxburst * dst_addr_width) {
2745                 dev_err(d40c->base->dev,
2746                         "src/dst width/maxburst mismatch: %d*%d != %d*%d\n",
2747                         src_maxburst,
2748                         src_addr_width,
2749                         dst_maxburst,
2750                         dst_addr_width);
2751                 return -EINVAL;
2752         }
2753
2754         if (src_maxburst > 16) {
2755                 src_maxburst = 16;
2756                 dst_maxburst = src_maxburst * src_addr_width / dst_addr_width;
2757         } else if (dst_maxburst > 16) {
2758                 dst_maxburst = 16;
2759                 src_maxburst = dst_maxburst * dst_addr_width / src_addr_width;
2760         }
2761
2762         /* Only valid widths are; 1, 2, 4 and 8. */
2763         if (src_addr_width <= DMA_SLAVE_BUSWIDTH_UNDEFINED ||
2764             src_addr_width >  DMA_SLAVE_BUSWIDTH_8_BYTES   ||
2765             dst_addr_width <= DMA_SLAVE_BUSWIDTH_UNDEFINED ||
2766             dst_addr_width >  DMA_SLAVE_BUSWIDTH_8_BYTES   ||
2767             !is_power_of_2(src_addr_width) ||
2768             !is_power_of_2(dst_addr_width))
2769                 return -EINVAL;
2770
2771         cfg->src_info.data_width = src_addr_width;
2772         cfg->dst_info.data_width = dst_addr_width;
2773
2774         ret = dma40_config_to_halfchannel(d40c, &cfg->src_info,
2775                                           src_maxburst);
2776         if (ret)
2777                 return ret;
2778
2779         ret = dma40_config_to_halfchannel(d40c, &cfg->dst_info,
2780                                           dst_maxburst);
2781         if (ret)
2782                 return ret;
2783
2784         /* Fill in register values */
2785         if (chan_is_logical(d40c))
2786                 d40_log_cfg(cfg, &d40c->log_def.lcsp1, &d40c->log_def.lcsp3);
2787         else
2788                 d40_phy_cfg(cfg, &d40c->src_def_cfg, &d40c->dst_def_cfg);
2789
2790         /* These settings will take precedence later */
2791         d40c->runtime_addr = config_addr;
2792         d40c->runtime_direction = config->direction;
2793         dev_dbg(d40c->base->dev,
2794                 "configured channel %s for %s, data width %d/%d, "
2795                 "maxburst %d/%d elements, LE, no flow control\n",
2796                 dma_chan_name(chan),
2797                 (config->direction == DMA_DEV_TO_MEM) ? "RX" : "TX",
2798                 src_addr_width, dst_addr_width,
2799                 src_maxburst, dst_maxburst);
2800
2801         return 0;
2802 }
2803
2804 /* Initialization functions */
2805
2806 static void __init d40_chan_init(struct d40_base *base, struct dma_device *dma,
2807                                  struct d40_chan *chans, int offset,
2808                                  int num_chans)
2809 {
2810         int i = 0;
2811         struct d40_chan *d40c;
2812
2813         INIT_LIST_HEAD(&dma->channels);
2814
2815         for (i = offset; i < offset + num_chans; i++) {
2816                 d40c = &chans[i];
2817                 d40c->base = base;
2818                 d40c->chan.device = dma;
2819
2820                 spin_lock_init(&d40c->lock);
2821
2822                 d40c->log_num = D40_PHY_CHAN;
2823
2824                 INIT_LIST_HEAD(&d40c->done);
2825                 INIT_LIST_HEAD(&d40c->active);
2826                 INIT_LIST_HEAD(&d40c->queue);
2827                 INIT_LIST_HEAD(&d40c->pending_queue);
2828                 INIT_LIST_HEAD(&d40c->client);
2829                 INIT_LIST_HEAD(&d40c->prepare_queue);
2830
2831                 tasklet_init(&d40c->tasklet, dma_tasklet,
2832                              (unsigned long) d40c);
2833
2834                 list_add_tail(&d40c->chan.device_node,
2835                               &dma->channels);
2836         }
2837 }
2838
2839 static void d40_ops_init(struct d40_base *base, struct dma_device *dev)
2840 {
2841         if (dma_has_cap(DMA_SLAVE, dev->cap_mask))
2842                 dev->device_prep_slave_sg = d40_prep_slave_sg;
2843
2844         if (dma_has_cap(DMA_MEMCPY, dev->cap_mask)) {
2845                 dev->device_prep_dma_memcpy = d40_prep_memcpy;
2846
2847                 /*
2848                  * This controller can only access address at even
2849                  * 32bit boundaries, i.e. 2^2
2850                  */
2851                 dev->copy_align = DMAENGINE_ALIGN_4_BYTES;
2852         }
2853
2854         if (dma_has_cap(DMA_SG, dev->cap_mask))
2855                 dev->device_prep_dma_sg = d40_prep_memcpy_sg;
2856
2857         if (dma_has_cap(DMA_CYCLIC, dev->cap_mask))
2858                 dev->device_prep_dma_cyclic = dma40_prep_dma_cyclic;
2859
2860         dev->device_alloc_chan_resources = d40_alloc_chan_resources;
2861         dev->device_free_chan_resources = d40_free_chan_resources;
2862         dev->device_issue_pending = d40_issue_pending;
2863         dev->device_tx_status = d40_tx_status;
2864         dev->device_config = d40_set_runtime_config;
2865         dev->device_pause = d40_pause;
2866         dev->device_resume = d40_resume;
2867         dev->device_terminate_all = d40_terminate_all;
2868         dev->dev = base->dev;
2869 }
2870
2871 static int __init d40_dmaengine_init(struct d40_base *base,
2872                                      int num_reserved_chans)
2873 {
2874         int err ;
2875
2876         d40_chan_init(base, &base->dma_slave, base->log_chans,
2877                       0, base->num_log_chans);
2878
2879         dma_cap_zero(base->dma_slave.cap_mask);
2880         dma_cap_set(DMA_SLAVE, base->dma_slave.cap_mask);
2881         dma_cap_set(DMA_CYCLIC, base->dma_slave.cap_mask);
2882
2883         d40_ops_init(base, &base->dma_slave);
2884
2885         err = dma_async_device_register(&base->dma_slave);
2886
2887         if (err) {
2888                 d40_err(base->dev, "Failed to register slave channels\n");
2889                 goto exit;
2890         }
2891
2892         d40_chan_init(base, &base->dma_memcpy, base->log_chans,
2893                       base->num_log_chans, base->num_memcpy_chans);
2894
2895         dma_cap_zero(base->dma_memcpy.cap_mask);
2896         dma_cap_set(DMA_MEMCPY, base->dma_memcpy.cap_mask);
2897         dma_cap_set(DMA_SG, base->dma_memcpy.cap_mask);
2898
2899         d40_ops_init(base, &base->dma_memcpy);
2900
2901         err = dma_async_device_register(&base->dma_memcpy);
2902
2903         if (err) {
2904                 d40_err(base->dev,
2905                         "Failed to register memcpy only channels\n");
2906                 goto unregister_slave;
2907         }
2908
2909         d40_chan_init(base, &base->dma_both, base->phy_chans,
2910                       0, num_reserved_chans);
2911
2912         dma_cap_zero(base->dma_both.cap_mask);
2913         dma_cap_set(DMA_SLAVE, base->dma_both.cap_mask);
2914         dma_cap_set(DMA_MEMCPY, base->dma_both.cap_mask);
2915         dma_cap_set(DMA_SG, base->dma_both.cap_mask);
2916         dma_cap_set(DMA_CYCLIC, base->dma_slave.cap_mask);
2917
2918         d40_ops_init(base, &base->dma_both);
2919         err = dma_async_device_register(&base->dma_both);
2920
2921         if (err) {
2922                 d40_err(base->dev,
2923                         "Failed to register logical and physical capable channels\n");
2924                 goto unregister_memcpy;
2925         }
2926         return 0;
2927  unregister_memcpy:
2928         dma_async_device_unregister(&base->dma_memcpy);
2929  unregister_slave:
2930         dma_async_device_unregister(&base->dma_slave);
2931  exit:
2932         return err;
2933 }
2934
2935 /* Suspend resume functionality */
2936 #ifdef CONFIG_PM_SLEEP
2937 static int dma40_suspend(struct device *dev)
2938 {
2939         struct platform_device *pdev = to_platform_device(dev);
2940         struct d40_base *base = platform_get_drvdata(pdev);
2941         int ret;
2942
2943         ret = pm_runtime_force_suspend(dev);
2944         if (ret)
2945                 return ret;
2946
2947         if (base->lcpa_regulator)
2948                 ret = regulator_disable(base->lcpa_regulator);
2949         return ret;
2950 }
2951
2952 static int dma40_resume(struct device *dev)
2953 {
2954         struct platform_device *pdev = to_platform_device(dev);
2955         struct d40_base *base = platform_get_drvdata(pdev);
2956         int ret = 0;
2957
2958         if (base->lcpa_regulator) {
2959                 ret = regulator_enable(base->lcpa_regulator);
2960                 if (ret)
2961                         return ret;
2962         }
2963
2964         return pm_runtime_force_resume(dev);
2965 }
2966 #endif
2967
2968 #ifdef CONFIG_PM
2969 static void dma40_backup(void __iomem *baseaddr, u32 *backup,
2970                          u32 *regaddr, int num, bool save)
2971 {
2972         int i;
2973
2974         for (i = 0; i < num; i++) {
2975                 void __iomem *addr = baseaddr + regaddr[i];
2976
2977                 if (save)
2978                         backup[i] = readl_relaxed(addr);
2979                 else
2980                         writel_relaxed(backup[i], addr);
2981         }
2982 }
2983
2984 static void d40_save_restore_registers(struct d40_base *base, bool save)
2985 {
2986         int i;
2987
2988         /* Save/Restore channel specific registers */
2989         for (i = 0; i < base->num_phy_chans; i++) {
2990                 void __iomem *addr;
2991                 int idx;
2992
2993                 if (base->phy_res[i].reserved)
2994                         continue;
2995
2996                 addr = base->virtbase + D40_DREG_PCBASE + i * D40_DREG_PCDELTA;
2997                 idx = i * ARRAY_SIZE(d40_backup_regs_chan);
2998
2999                 dma40_backup(addr, &base->reg_val_backup_chan[idx],
3000                              d40_backup_regs_chan,
3001                              ARRAY_SIZE(d40_backup_regs_chan),
3002                              save);
3003         }
3004
3005         /* Save/Restore global registers */
3006         dma40_backup(base->virtbase, base->reg_val_backup,
3007                      d40_backup_regs, ARRAY_SIZE(d40_backup_regs),
3008                      save);
3009
3010         /* Save/Restore registers only existing on dma40 v3 and later */
3011         if (base->gen_dmac.backup)
3012                 dma40_backup(base->virtbase, base->reg_val_backup_v4,
3013                              base->gen_dmac.backup,
3014                         base->gen_dmac.backup_size,
3015                         save);
3016 }
3017
3018 static int dma40_runtime_suspend(struct device *dev)
3019 {
3020         struct platform_device *pdev = to_platform_device(dev);
3021         struct d40_base *base = platform_get_drvdata(pdev);
3022
3023         d40_save_restore_registers(base, true);
3024
3025         /* Don't disable/enable clocks for v1 due to HW bugs */
3026         if (base->rev != 1)
3027                 writel_relaxed(base->gcc_pwr_off_mask,
3028                                base->virtbase + D40_DREG_GCC);
3029
3030         return 0;
3031 }
3032
3033 static int dma40_runtime_resume(struct device *dev)
3034 {
3035         struct platform_device *pdev = to_platform_device(dev);
3036         struct d40_base *base = platform_get_drvdata(pdev);
3037
3038         d40_save_restore_registers(base, false);
3039
3040         writel_relaxed(D40_DREG_GCC_ENABLE_ALL,
3041                        base->virtbase + D40_DREG_GCC);
3042         return 0;
3043 }
3044 #endif
3045
3046 static const struct dev_pm_ops dma40_pm_ops = {
3047         SET_LATE_SYSTEM_SLEEP_PM_OPS(dma40_suspend, dma40_resume)
3048         SET_RUNTIME_PM_OPS(dma40_runtime_suspend,
3049                                 dma40_runtime_resume,
3050                                 NULL)
3051 };
3052
3053 /* Initialization functions. */
3054
3055 static int __init d40_phy_res_init(struct d40_base *base)
3056 {
3057         int i;
3058         int num_phy_chans_avail = 0;
3059         u32 val[2];
3060         int odd_even_bit = -2;
3061         int gcc = D40_DREG_GCC_ENA;
3062
3063         val[0] = readl(base->virtbase + D40_DREG_PRSME);
3064         val[1] = readl(base->virtbase + D40_DREG_PRSMO);
3065
3066         for (i = 0; i < base->num_phy_chans; i++) {
3067                 base->phy_res[i].num = i;
3068                 odd_even_bit += 2 * ((i % 2) == 0);
3069                 if (((val[i % 2] >> odd_even_bit) & 3) == 1) {
3070                         /* Mark security only channels as occupied */
3071                         base->phy_res[i].allocated_src = D40_ALLOC_PHY;
3072                         base->phy_res[i].allocated_dst = D40_ALLOC_PHY;
3073                         base->phy_res[i].reserved = true;
3074                         gcc |= D40_DREG_GCC_EVTGRP_ENA(D40_PHYS_TO_GROUP(i),
3075                                                        D40_DREG_GCC_SRC);
3076                         gcc |= D40_DREG_GCC_EVTGRP_ENA(D40_PHYS_TO_GROUP(i),
3077                                                        D40_DREG_GCC_DST);
3078
3079
3080                 } else {
3081                         base->phy_res[i].allocated_src = D40_ALLOC_FREE;
3082                         base->phy_res[i].allocated_dst = D40_ALLOC_FREE;
3083                         base->phy_res[i].reserved = false;
3084                         num_phy_chans_avail++;
3085                 }
3086                 spin_lock_init(&base->phy_res[i].lock);
3087         }
3088
3089         /* Mark disabled channels as occupied */
3090         for (i = 0; base->plat_data->disabled_channels[i] != -1; i++) {
3091                 int chan = base->plat_data->disabled_channels[i];
3092
3093                 base->phy_res[chan].allocated_src = D40_ALLOC_PHY;
3094                 base->phy_res[chan].allocated_dst = D40_ALLOC_PHY;
3095                 base->phy_res[chan].reserved = true;
3096                 gcc |= D40_DREG_GCC_EVTGRP_ENA(D40_PHYS_TO_GROUP(chan),
3097                                                D40_DREG_GCC_SRC);
3098                 gcc |= D40_DREG_GCC_EVTGRP_ENA(D40_PHYS_TO_GROUP(chan),
3099                                                D40_DREG_GCC_DST);
3100                 num_phy_chans_avail--;
3101         }
3102
3103         /* Mark soft_lli channels */
3104         for (i = 0; i < base->plat_data->num_of_soft_lli_chans; i++) {
3105                 int chan = base->plat_data->soft_lli_chans[i];
3106
3107                 base->phy_res[chan].use_soft_lli = true;
3108         }
3109
3110         dev_info(base->dev, "%d of %d physical DMA channels available\n",
3111                  num_phy_chans_avail, base->num_phy_chans);
3112
3113         /* Verify settings extended vs standard */
3114         val[0] = readl(base->virtbase + D40_DREG_PRTYP);
3115
3116         for (i = 0; i < base->num_phy_chans; i++) {
3117
3118                 if (base->phy_res[i].allocated_src == D40_ALLOC_FREE &&
3119                     (val[0] & 0x3) != 1)
3120                         dev_info(base->dev,
3121                                  "[%s] INFO: channel %d is misconfigured (%d)\n",
3122                                  __func__, i, val[0] & 0x3);
3123
3124                 val[0] = val[0] >> 2;
3125         }
3126
3127         /*
3128          * To keep things simple, Enable all clocks initially.
3129          * The clocks will get managed later post channel allocation.
3130          * The clocks for the event lines on which reserved channels exists
3131          * are not managed here.
3132          */
3133         writel(D40_DREG_GCC_ENABLE_ALL, base->virtbase + D40_DREG_GCC);
3134         base->gcc_pwr_off_mask = gcc;
3135
3136         return num_phy_chans_avail;
3137 }
3138
3139 static struct d40_base * __init d40_hw_detect_init(struct platform_device *pdev)
3140 {
3141         struct stedma40_platform_data *plat_data = dev_get_platdata(&pdev->dev);
3142         struct clk *clk;
3143         void __iomem *virtbase;
3144         struct resource *res;
3145         struct d40_base *base;
3146         int num_log_chans;
3147         int num_phy_chans;
3148         int num_memcpy_chans;
3149         int clk_ret = -EINVAL;
3150         int i;
3151         u32 pid;
3152         u32 cid;
3153         u8 rev;
3154
3155         clk = clk_get(&pdev->dev, NULL);
3156         if (IS_ERR(clk)) {
3157                 d40_err(&pdev->dev, "No matching clock found\n");
3158                 goto check_prepare_enabled;
3159         }
3160
3161         clk_ret = clk_prepare_enable(clk);
3162         if (clk_ret) {
3163                 d40_err(&pdev->dev, "Failed to prepare/enable clock\n");
3164                 goto disable_unprepare;
3165         }
3166
3167         /* Get IO for DMAC base address */
3168         res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "base");
3169         if (!res)
3170                 goto disable_unprepare;
3171
3172         if (request_mem_region(res->start, resource_size(res),
3173                                D40_NAME " I/O base") == NULL)
3174                 goto release_region;
3175
3176         virtbase = ioremap(res->start, resource_size(res));
3177         if (!virtbase)
3178                 goto release_region;
3179
3180         /* This is just a regular AMBA PrimeCell ID actually */
3181         for (pid = 0, i = 0; i < 4; i++)
3182                 pid |= (readl(virtbase + resource_size(res) - 0x20 + 4 * i)
3183                         & 255) << (i * 8);
3184         for (cid = 0, i = 0; i < 4; i++)
3185                 cid |= (readl(virtbase + resource_size(res) - 0x10 + 4 * i)
3186                         & 255) << (i * 8);
3187
3188         if (cid != AMBA_CID) {
3189                 d40_err(&pdev->dev, "Unknown hardware! No PrimeCell ID\n");
3190                 goto unmap_io;
3191         }
3192         if (AMBA_MANF_BITS(pid) != AMBA_VENDOR_ST) {
3193                 d40_err(&pdev->dev, "Unknown designer! Got %x wanted %x\n",
3194                         AMBA_MANF_BITS(pid),
3195                         AMBA_VENDOR_ST);
3196                 goto unmap_io;
3197         }
3198         /*
3199          * HW revision:
3200          * DB8500ed has revision 0
3201          * ? has revision 1
3202          * DB8500v1 has revision 2
3203          * DB8500v2 has revision 3
3204          * AP9540v1 has revision 4
3205          * DB8540v1 has revision 4
3206          */
3207         rev = AMBA_REV_BITS(pid);
3208         if (rev < 2) {
3209                 d40_err(&pdev->dev, "hardware revision: %d is not supported", rev);
3210                 goto unmap_io;
3211         }
3212
3213         /* The number of physical channels on this HW */
3214         if (plat_data->num_of_phy_chans)
3215                 num_phy_chans = plat_data->num_of_phy_chans;
3216         else
3217                 num_phy_chans = 4 * (readl(virtbase + D40_DREG_ICFG) & 0x7) + 4;
3218
3219         /* The number of channels used for memcpy */
3220         if (plat_data->num_of_memcpy_chans)
3221                 num_memcpy_chans = plat_data->num_of_memcpy_chans;
3222         else
3223                 num_memcpy_chans = ARRAY_SIZE(dma40_memcpy_channels);
3224
3225         num_log_chans = num_phy_chans * D40_MAX_LOG_CHAN_PER_PHY;
3226
3227         dev_info(&pdev->dev,
3228                  "hardware rev: %d @ %pa with %d physical and %d logical channels\n",
3229                  rev, &res->start, num_phy_chans, num_log_chans);
3230
3231         base = kzalloc(ALIGN(sizeof(struct d40_base), 4) +
3232                        (num_phy_chans + num_log_chans + num_memcpy_chans) *
3233                        sizeof(struct d40_chan), GFP_KERNEL);
3234
3235         if (base == NULL)
3236                 goto unmap_io;
3237
3238         base->rev = rev;
3239         base->clk = clk;
3240         base->num_memcpy_chans = num_memcpy_chans;
3241         base->num_phy_chans = num_phy_chans;
3242         base->num_log_chans = num_log_chans;
3243         base->phy_start = res->start;
3244         base->phy_size = resource_size(res);
3245         base->virtbase = virtbase;
3246         base->plat_data = plat_data;
3247         base->dev = &pdev->dev;
3248         base->phy_chans = ((void *)base) + ALIGN(sizeof(struct d40_base), 4);
3249         base->log_chans = &base->phy_chans[num_phy_chans];
3250
3251         if (base->plat_data->num_of_phy_chans == 14) {
3252                 base->gen_dmac.backup = d40_backup_regs_v4b;
3253                 base->gen_dmac.backup_size = BACKUP_REGS_SZ_V4B;
3254                 base->gen_dmac.interrupt_en = D40_DREG_CPCMIS;
3255                 base->gen_dmac.interrupt_clear = D40_DREG_CPCICR;
3256                 base->gen_dmac.realtime_en = D40_DREG_CRSEG1;
3257                 base->gen_dmac.realtime_clear = D40_DREG_CRCEG1;
3258                 base->gen_dmac.high_prio_en = D40_DREG_CPSEG1;
3259                 base->gen_dmac.high_prio_clear = D40_DREG_CPCEG1;
3260                 base->gen_dmac.il = il_v4b;
3261                 base->gen_dmac.il_size = ARRAY_SIZE(il_v4b);
3262                 base->gen_dmac.init_reg = dma_init_reg_v4b;
3263                 base->gen_dmac.init_reg_size = ARRAY_SIZE(dma_init_reg_v4b);
3264         } else {
3265                 if (base->rev >= 3) {
3266                         base->gen_dmac.backup = d40_backup_regs_v4a;
3267                         base->gen_dmac.backup_size = BACKUP_REGS_SZ_V4A;
3268                 }
3269                 base->gen_dmac.interrupt_en = D40_DREG_PCMIS;
3270                 base->gen_dmac.interrupt_clear = D40_DREG_PCICR;
3271                 base->gen_dmac.realtime_en = D40_DREG_RSEG1;
3272                 base->gen_dmac.realtime_clear = D40_DREG_RCEG1;
3273                 base->gen_dmac.high_prio_en = D40_DREG_PSEG1;
3274                 base->gen_dmac.high_prio_clear = D40_DREG_PCEG1;
3275                 base->gen_dmac.il = il_v4a;
3276                 base->gen_dmac.il_size = ARRAY_SIZE(il_v4a);
3277                 base->gen_dmac.init_reg = dma_init_reg_v4a;
3278                 base->gen_dmac.init_reg_size = ARRAY_SIZE(dma_init_reg_v4a);
3279         }
3280
3281         base->phy_res = kcalloc(num_phy_chans,
3282                                 sizeof(*base->phy_res),
3283                                 GFP_KERNEL);
3284         if (!base->phy_res)
3285                 goto free_base;
3286
3287         base->lookup_phy_chans = kcalloc(num_phy_chans,
3288                                          sizeof(*base->lookup_phy_chans),
3289                                          GFP_KERNEL);
3290         if (!base->lookup_phy_chans)
3291                 goto free_phy_res;
3292
3293         base->lookup_log_chans = kcalloc(num_log_chans,
3294                                          sizeof(*base->lookup_log_chans),
3295                                          GFP_KERNEL);
3296         if (!base->lookup_log_chans)
3297                 goto free_phy_chans;
3298
3299         base->reg_val_backup_chan = kmalloc_array(base->num_phy_chans,
3300                                                   sizeof(d40_backup_regs_chan),
3301                                                   GFP_KERNEL);
3302         if (!base->reg_val_backup_chan)
3303                 goto free_log_chans;
3304
3305         base->lcla_pool.alloc_map = kcalloc(num_phy_chans
3306                                             * D40_LCLA_LINK_PER_EVENT_GRP,
3307                                             sizeof(*base->lcla_pool.alloc_map),
3308                                             GFP_KERNEL);
3309         if (!base->lcla_pool.alloc_map)
3310                 goto free_backup_chan;
3311
3312         base->desc_slab = kmem_cache_create(D40_NAME, sizeof(struct d40_desc),
3313                                             0, SLAB_HWCACHE_ALIGN,
3314                                             NULL);
3315         if (base->desc_slab == NULL)
3316                 goto free_map;
3317
3318         return base;
3319  free_map:
3320         kfree(base->lcla_pool.alloc_map);
3321  free_backup_chan:
3322         kfree(base->reg_val_backup_chan);
3323  free_log_chans:
3324         kfree(base->lookup_log_chans);
3325  free_phy_chans:
3326         kfree(base->lookup_phy_chans);
3327  free_phy_res:
3328         kfree(base->phy_res);
3329  free_base:
3330         kfree(base);
3331  unmap_io:
3332         iounmap(virtbase);
3333  release_region:
3334         release_mem_region(res->start, resource_size(res));
3335  check_prepare_enabled:
3336         if (!clk_ret)
3337  disable_unprepare:
3338                 clk_disable_unprepare(clk);
3339         if (!IS_ERR(clk))
3340                 clk_put(clk);
3341         return NULL;
3342 }
3343
3344 static void __init d40_hw_init(struct d40_base *base)
3345 {
3346
3347         int i;
3348         u32 prmseo[2] = {0, 0};
3349         u32 activeo[2] = {0xFFFFFFFF, 0xFFFFFFFF};
3350         u32 pcmis = 0;
3351         u32 pcicr = 0;
3352         struct d40_reg_val *dma_init_reg = base->gen_dmac.init_reg;
3353         u32 reg_size = base->gen_dmac.init_reg_size;
3354
3355         for (i = 0; i < reg_size; i++)
3356                 writel(dma_init_reg[i].val,
3357                        base->virtbase + dma_init_reg[i].reg);
3358
3359         /* Configure all our dma channels to default settings */
3360         for (i = 0; i < base->num_phy_chans; i++) {
3361
3362                 activeo[i % 2] = activeo[i % 2] << 2;
3363
3364                 if (base->phy_res[base->num_phy_chans - i - 1].allocated_src
3365                     == D40_ALLOC_PHY) {
3366                         activeo[i % 2] |= 3;
3367                         continue;
3368                 }
3369
3370                 /* Enable interrupt # */
3371                 pcmis = (pcmis << 1) | 1;
3372
3373                 /* Clear interrupt # */
3374                 pcicr = (pcicr << 1) | 1;
3375
3376                 /* Set channel to physical mode */
3377                 prmseo[i % 2] = prmseo[i % 2] << 2;
3378                 prmseo[i % 2] |= 1;
3379
3380         }
3381
3382         writel(prmseo[1], base->virtbase + D40_DREG_PRMSE);
3383         writel(prmseo[0], base->virtbase + D40_DREG_PRMSO);
3384         writel(activeo[1], base->virtbase + D40_DREG_ACTIVE);
3385         writel(activeo[0], base->virtbase + D40_DREG_ACTIVO);
3386
3387         /* Write which interrupt to enable */
3388         writel(pcmis, base->virtbase + base->gen_dmac.interrupt_en);
3389
3390         /* Write which interrupt to clear */
3391         writel(pcicr, base->virtbase + base->gen_dmac.interrupt_clear);
3392
3393         /* These are __initdata and cannot be accessed after init */
3394         base->gen_dmac.init_reg = NULL;
3395         base->gen_dmac.init_reg_size = 0;
3396 }
3397
3398 static int __init d40_lcla_allocate(struct d40_base *base)
3399 {
3400         struct d40_lcla_pool *pool = &base->lcla_pool;
3401         unsigned long *page_list;
3402         int i, j;
3403         int ret;
3404
3405         /*
3406          * This is somewhat ugly. We need 8192 bytes that are 18 bit aligned,
3407          * To full fill this hardware requirement without wasting 256 kb
3408          * we allocate pages until we get an aligned one.
3409          */
3410         page_list = kmalloc_array(MAX_LCLA_ALLOC_ATTEMPTS,
3411                                   sizeof(*page_list),
3412                                   GFP_KERNEL);
3413         if (!page_list)
3414                 return -ENOMEM;
3415
3416         /* Calculating how many pages that are required */
3417         base->lcla_pool.pages = SZ_1K * base->num_phy_chans / PAGE_SIZE;
3418
3419         for (i = 0; i < MAX_LCLA_ALLOC_ATTEMPTS; i++) {
3420                 page_list[i] = __get_free_pages(GFP_KERNEL,
3421                                                 base->lcla_pool.pages);
3422                 if (!page_list[i]) {
3423
3424                         d40_err(base->dev, "Failed to allocate %d pages.\n",
3425                                 base->lcla_pool.pages);
3426                         ret = -ENOMEM;
3427
3428                         for (j = 0; j < i; j++)
3429                                 free_pages(page_list[j], base->lcla_pool.pages);
3430                         goto free_page_list;
3431                 }
3432
3433                 if ((virt_to_phys((void *)page_list[i]) &
3434                      (LCLA_ALIGNMENT - 1)) == 0)
3435                         break;
3436         }
3437
3438         for (j = 0; j < i; j++)
3439                 free_pages(page_list[j], base->lcla_pool.pages);
3440
3441         if (i < MAX_LCLA_ALLOC_ATTEMPTS) {
3442                 base->lcla_pool.base = (void *)page_list[i];
3443         } else {
3444                 /*
3445                  * After many attempts and no succees with finding the correct
3446                  * alignment, try with allocating a big buffer.
3447                  */
3448                 dev_warn(base->dev,
3449                          "[%s] Failed to get %d pages @ 18 bit align.\n",
3450                          __func__, base->lcla_pool.pages);
3451                 base->lcla_pool.base_unaligned = kmalloc(SZ_1K *
3452                                                          base->num_phy_chans +
3453                                                          LCLA_ALIGNMENT,
3454                                                          GFP_KERNEL);
3455                 if (!base->lcla_pool.base_unaligned) {
3456                         ret = -ENOMEM;
3457                         goto free_page_list;
3458                 }
3459
3460                 base->lcla_pool.base = PTR_ALIGN(base->lcla_pool.base_unaligned,
3461                                                  LCLA_ALIGNMENT);
3462         }
3463
3464         pool->dma_addr = dma_map_single(base->dev, pool->base,
3465                                         SZ_1K * base->num_phy_chans,
3466                                         DMA_TO_DEVICE);
3467         if (dma_mapping_error(base->dev, pool->dma_addr)) {
3468                 pool->dma_addr = 0;
3469                 ret = -ENOMEM;
3470                 goto free_page_list;
3471         }
3472
3473         writel(virt_to_phys(base->lcla_pool.base),
3474                base->virtbase + D40_DREG_LCLA);
3475         ret = 0;
3476  free_page_list:
3477         kfree(page_list);
3478         return ret;
3479 }
3480
3481 static int __init d40_of_probe(struct platform_device *pdev,
3482                                struct device_node *np)
3483 {
3484         struct stedma40_platform_data *pdata;
3485         int num_phy = 0, num_memcpy = 0, num_disabled = 0;
3486         const __be32 *list;
3487
3488         pdata = devm_kzalloc(&pdev->dev, sizeof(*pdata), GFP_KERNEL);
3489         if (!pdata)
3490                 return -ENOMEM;
3491
3492         /* If absent this value will be obtained from h/w. */
3493         of_property_read_u32(np, "dma-channels", &num_phy);
3494         if (num_phy > 0)
3495                 pdata->num_of_phy_chans = num_phy;
3496
3497         list = of_get_property(np, "memcpy-channels", &num_memcpy);
3498         num_memcpy /= sizeof(*list);
3499
3500         if (num_memcpy > D40_MEMCPY_MAX_CHANS || num_memcpy <= 0) {
3501                 d40_err(&pdev->dev,
3502                         "Invalid number of memcpy channels specified (%d)\n",
3503                         num_memcpy);
3504                 return -EINVAL;
3505         }
3506         pdata->num_of_memcpy_chans = num_memcpy;
3507
3508         of_property_read_u32_array(np, "memcpy-channels",
3509                                    dma40_memcpy_channels,
3510                                    num_memcpy);
3511
3512         list = of_get_property(np, "disabled-channels", &num_disabled);
3513         num_disabled /= sizeof(*list);
3514
3515         if (num_disabled >= STEDMA40_MAX_PHYS || num_disabled < 0) {
3516                 d40_err(&pdev->dev,
3517                         "Invalid number of disabled channels specified (%d)\n",
3518                         num_disabled);
3519                 return -EINVAL;
3520         }
3521
3522         of_property_read_u32_array(np, "disabled-channels",
3523                                    pdata->disabled_channels,
3524                                    num_disabled);
3525         pdata->disabled_channels[num_disabled] = -1;
3526
3527         pdev->dev.platform_data = pdata;
3528
3529         return 0;
3530 }
3531
3532 static int __init d40_probe(struct platform_device *pdev)
3533 {
3534         struct stedma40_platform_data *plat_data = dev_get_platdata(&pdev->dev);
3535         struct device_node *np = pdev->dev.of_node;
3536         int ret = -ENOENT;
3537         struct d40_base *base;
3538         struct resource *res;
3539         int num_reserved_chans;
3540         u32 val;
3541
3542         if (!plat_data) {
3543                 if (np) {
3544                         if (d40_of_probe(pdev, np)) {
3545                                 ret = -ENOMEM;
3546                                 goto report_failure;
3547                         }
3548                 } else {
3549                         d40_err(&pdev->dev, "No pdata or Device Tree provided\n");
3550                         goto report_failure;
3551                 }
3552         }
3553
3554         base = d40_hw_detect_init(pdev);
3555         if (!base)
3556                 goto report_failure;
3557
3558         num_reserved_chans = d40_phy_res_init(base);
3559
3560         platform_set_drvdata(pdev, base);
3561
3562         spin_lock_init(&base->interrupt_lock);
3563         spin_lock_init(&base->execmd_lock);
3564
3565         /* Get IO for logical channel parameter address */
3566         res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "lcpa");
3567         if (!res) {
3568                 ret = -ENOENT;
3569                 d40_err(&pdev->dev, "No \"lcpa\" memory resource\n");
3570                 goto destroy_cache;
3571         }
3572         base->lcpa_size = resource_size(res);
3573         base->phy_lcpa = res->start;
3574
3575         if (request_mem_region(res->start, resource_size(res),
3576                                D40_NAME " I/O lcpa") == NULL) {
3577                 ret = -EBUSY;
3578                 d40_err(&pdev->dev, "Failed to request LCPA region %pR\n", res);
3579                 goto destroy_cache;
3580         }
3581
3582         /* We make use of ESRAM memory for this. */
3583         val = readl(base->virtbase + D40_DREG_LCPA);
3584         if (res->start != val && val != 0) {
3585                 dev_warn(&pdev->dev,
3586                          "[%s] Mismatch LCPA dma 0x%x, def %pa\n",
3587                          __func__, val, &res->start);
3588         } else
3589                 writel(res->start, base->virtbase + D40_DREG_LCPA);
3590
3591         base->lcpa_base = ioremap(res->start, resource_size(res));
3592         if (!base->lcpa_base) {
3593                 ret = -ENOMEM;
3594                 d40_err(&pdev->dev, "Failed to ioremap LCPA region\n");
3595                 goto destroy_cache;
3596         }
3597         /* If lcla has to be located in ESRAM we don't need to allocate */
3598         if (base->plat_data->use_esram_lcla) {
3599                 res = platform_get_resource_byname(pdev, IORESOURCE_MEM,
3600                                                         "lcla_esram");
3601                 if (!res) {
3602                         ret = -ENOENT;
3603                         d40_err(&pdev->dev,
3604                                 "No \"lcla_esram\" memory resource\n");
3605                         goto destroy_cache;
3606                 }
3607                 base->lcla_pool.base = ioremap(res->start,
3608                                                 resource_size(res));
3609                 if (!base->lcla_pool.base) {
3610                         ret = -ENOMEM;
3611                         d40_err(&pdev->dev, "Failed to ioremap LCLA region\n");
3612                         goto destroy_cache;
3613                 }
3614                 writel(res->start, base->virtbase + D40_DREG_LCLA);
3615
3616         } else {
3617                 ret = d40_lcla_allocate(base);
3618                 if (ret) {
3619                         d40_err(&pdev->dev, "Failed to allocate LCLA area\n");
3620                         goto destroy_cache;
3621                 }
3622         }
3623
3624         spin_lock_init(&base->lcla_pool.lock);
3625
3626         base->irq = platform_get_irq(pdev, 0);
3627
3628         ret = request_irq(base->irq, d40_handle_interrupt, 0, D40_NAME, base);
3629         if (ret) {
3630                 d40_err(&pdev->dev, "No IRQ defined\n");
3631                 goto destroy_cache;
3632         }
3633
3634         if (base->plat_data->use_esram_lcla) {
3635
3636                 base->lcpa_regulator = regulator_get(base->dev, "lcla_esram");
3637                 if (IS_ERR(base->lcpa_regulator)) {
3638                         d40_err(&pdev->dev, "Failed to get lcpa_regulator\n");
3639                         ret = PTR_ERR(base->lcpa_regulator);
3640                         base->lcpa_regulator = NULL;
3641                         goto destroy_cache;
3642                 }
3643
3644                 ret = regulator_enable(base->lcpa_regulator);
3645                 if (ret) {
3646                         d40_err(&pdev->dev,
3647                                 "Failed to enable lcpa_regulator\n");
3648                         regulator_put(base->lcpa_regulator);
3649                         base->lcpa_regulator = NULL;
3650                         goto destroy_cache;
3651                 }
3652         }
3653
3654         writel_relaxed(D40_DREG_GCC_ENABLE_ALL, base->virtbase + D40_DREG_GCC);
3655
3656         pm_runtime_irq_safe(base->dev);
3657         pm_runtime_set_autosuspend_delay(base->dev, DMA40_AUTOSUSPEND_DELAY);
3658         pm_runtime_use_autosuspend(base->dev);
3659         pm_runtime_mark_last_busy(base->dev);
3660         pm_runtime_set_active(base->dev);
3661         pm_runtime_enable(base->dev);
3662
3663         ret = d40_dmaengine_init(base, num_reserved_chans);
3664         if (ret)
3665                 goto destroy_cache;
3666
3667         base->dev->dma_parms = &base->dma_parms;
3668         ret = dma_set_max_seg_size(base->dev, STEDMA40_MAX_SEG_SIZE);
3669         if (ret) {
3670                 d40_err(&pdev->dev, "Failed to set dma max seg size\n");
3671                 goto destroy_cache;
3672         }
3673
3674         d40_hw_init(base);
3675
3676         if (np) {
3677                 ret = of_dma_controller_register(np, d40_xlate, NULL);
3678                 if (ret)
3679                         dev_err(&pdev->dev,
3680                                 "could not register of_dma_controller\n");
3681         }
3682
3683         dev_info(base->dev, "initialized\n");
3684         return 0;
3685  destroy_cache:
3686         kmem_cache_destroy(base->desc_slab);
3687         if (base->virtbase)
3688                 iounmap(base->virtbase);
3689
3690         if (base->lcla_pool.base && base->plat_data->use_esram_lcla) {
3691                 iounmap(base->lcla_pool.base);
3692                 base->lcla_pool.base = NULL;
3693         }
3694
3695         if (base->lcla_pool.dma_addr)
3696                 dma_unmap_single(base->dev, base->lcla_pool.dma_addr,
3697                                  SZ_1K * base->num_phy_chans,
3698                                  DMA_TO_DEVICE);
3699
3700         if (!base->lcla_pool.base_unaligned && base->lcla_pool.base)
3701                 free_pages((unsigned long)base->lcla_pool.base,
3702                            base->lcla_pool.pages);
3703
3704         kfree(base->lcla_pool.base_unaligned);
3705
3706         if (base->phy_lcpa)
3707                 release_mem_region(base->phy_lcpa,
3708                                    base->lcpa_size);
3709         if (base->phy_start)
3710                 release_mem_region(base->phy_start,
3711                                    base->phy_size);
3712         if (base->clk) {
3713                 clk_disable_unprepare(base->clk);
3714                 clk_put(base->clk);
3715         }
3716
3717         if (base->lcpa_regulator) {
3718                 regulator_disable(base->lcpa_regulator);
3719                 regulator_put(base->lcpa_regulator);
3720         }
3721
3722         kfree(base->lcla_pool.alloc_map);
3723         kfree(base->lookup_log_chans);
3724         kfree(base->lookup_phy_chans);
3725         kfree(base->phy_res);
3726         kfree(base);
3727  report_failure:
3728         d40_err(&pdev->dev, "probe failed\n");
3729         return ret;
3730 }
3731
3732 static const struct of_device_id d40_match[] = {
3733         { .compatible = "stericsson,dma40", },
3734         {}
3735 };
3736
3737 static struct platform_driver d40_driver = {
3738         .driver = {
3739                 .name  = D40_NAME,
3740                 .pm = &dma40_pm_ops,
3741                 .of_match_table = d40_match,
3742         },
3743 };
3744
3745 static int __init stedma40_init(void)
3746 {
3747         return platform_driver_probe(&d40_driver, d40_probe);
3748 }
3749 subsys_initcall(stedma40_init);