arch/arm/mach-lpc32xx/irq.c

   1 /*
   2  * arch/arm/mach-lpc32xx/irq.c
   3  *
   4  * Author: Kevin Wells <kevin.wells@nxp.com>
   5  *
   6  * Copyright (C) 2010 NXP Semiconductors
   7  *
   8  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License as published by
  10  * the Free Software Foundation; either version 2 of the License, or
  11  * (at your option) any later version.
  12  *
  13  * This program is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  * GNU General Public License for more details.
  17  */
  18
  19 #include <linux/kernel.h>
  20 #include <linux/types.h>
  21 #include <linux/interrupt.h>
  22 #include <linux/irq.h>
  23 #include <linux/err.h>
  24 #include <linux/io.h>
  25
  26 #include <mach/irqs.h>
  27 #include <mach/hardware.h>
  28 #include <mach/platform.h>
  29 #include "common.h"
  30
  31 /*
  32  * Default value representing the Activation polarity of all internal
  33  * interrupt sources
  34  */
  35 #define MIC_APR_DEFAULT         0x3FF0EFE0
  36 #define SIC1_APR_DEFAULT        0xFBD27186
  37 #define SIC2_APR_DEFAULT        0x801810C0
  38
  39 /*
  40  * Default value representing the Activation Type of all internal
  41  * interrupt sources. All are level sensitive.
  42  */
  43 #define MIC_ATR_DEFAULT         0x00000000
  44 #define SIC1_ATR_DEFAULT        0x00026000
  45 #define SIC2_ATR_DEFAULT        0x00000000
  46
  47 struct lpc32xx_event_group_regs {
  48         void __iomem *enab_reg;
  49         void __iomem *edge_reg;
  50         void __iomem *maskstat_reg;
  51         void __iomem *rawstat_reg;
  52 };
  53
  54 static const struct lpc32xx_event_group_regs lpc32xx_event_int_regs = {
  55         .enab_reg = LPC32XX_CLKPWR_INT_ER,
  56         .edge_reg = LPC32XX_CLKPWR_INT_AP,
  57         .maskstat_reg = LPC32XX_CLKPWR_INT_SR,
  58         .rawstat_reg = LPC32XX_CLKPWR_INT_RS,
  59 };
  60
  61 static const struct lpc32xx_event_group_regs lpc32xx_event_pin_regs = {
  62         .enab_reg = LPC32XX_CLKPWR_PIN_ER,
  63         .edge_reg = LPC32XX_CLKPWR_PIN_AP,
  64         .maskstat_reg = LPC32XX_CLKPWR_PIN_SR,
  65         .rawstat_reg = LPC32XX_CLKPWR_PIN_RS,
  66 };
  67
  68 struct lpc32xx_event_info {
  69         const struct lpc32xx_event_group_regs *event_group;
  70         u32 mask;
  71 };
  72
  73 /*
  74  * Maps an IRQ number to and event mask and register
  75  */
  76 static const struct lpc32xx_event_info lpc32xx_events[NR_IRQS] = {
  77         [IRQ_LPC32XX_GPI_08] = {
  78                 .event_group = &lpc32xx_event_pin_regs,
  79                 .mask = LPC32XX_CLKPWR_EXTSRC_GPI_08_BIT,
  80         },
  81         [IRQ_LPC32XX_GPI_09] = {
  82                 .event_group = &lpc32xx_event_pin_regs,
  83                 .mask = LPC32XX_CLKPWR_EXTSRC_GPI_09_BIT,
  84         },
  85         [IRQ_LPC32XX_GPI_19] = {
  86                 .event_group = &lpc32xx_event_pin_regs,
  87                 .mask = LPC32XX_CLKPWR_EXTSRC_GPI_19_BIT,
  88         },
  89         [IRQ_LPC32XX_GPI_07] = {
  90                 .event_group = &lpc32xx_event_pin_regs,
  91                 .mask = LPC32XX_CLKPWR_EXTSRC_GPI_07_BIT,
  92         },
  93         [IRQ_LPC32XX_GPI_00] = {
  94                 .event_group = &lpc32xx_event_pin_regs,
  95                 .mask = LPC32XX_CLKPWR_EXTSRC_GPI_00_BIT,
  96         },
  97         [IRQ_LPC32XX_GPI_01] = {
  98                 .event_group = &lpc32xx_event_pin_regs,
  99                 .mask = LPC32XX_CLKPWR_EXTSRC_GPI_01_BIT,
 100         },
 101         [IRQ_LPC32XX_GPI_02] = {
 102                 .event_group = &lpc32xx_event_pin_regs,
 103                 .mask = LPC32XX_CLKPWR_EXTSRC_GPI_02_BIT,
 104         },
 105         [IRQ_LPC32XX_GPI_03] = {
 106                 .event_group = &lpc32xx_event_pin_regs,
 107                 .mask = LPC32XX_CLKPWR_EXTSRC_GPI_03_BIT,
 108         },
 109         [IRQ_LPC32XX_GPI_04] = {
 110                 .event_group = &lpc32xx_event_pin_regs,
 111                 .mask = LPC32XX_CLKPWR_EXTSRC_GPI_04_BIT,
 112         },
 113         [IRQ_LPC32XX_GPI_05] = {
 114                 .event_group = &lpc32xx_event_pin_regs,
 115                 .mask = LPC32XX_CLKPWR_EXTSRC_GPI_05_BIT,
 116         },
 117         [IRQ_LPC32XX_GPI_06] = {
 118                 .event_group = &lpc32xx_event_pin_regs,
 119                 .mask = LPC32XX_CLKPWR_EXTSRC_GPI_06_BIT,
 120         },
 121         [IRQ_LPC32XX_GPI_28] = {
 122                 .event_group = &lpc32xx_event_pin_regs,
 123                 .mask = LPC32XX_CLKPWR_EXTSRC_GPI_28_BIT,
 124         },
 125         [IRQ_LPC32XX_GPIO_00] = {
 126                 .event_group = &lpc32xx_event_int_regs,
 127                 .mask = LPC32XX_CLKPWR_INTSRC_GPIO_00_BIT,
 128         },
 129         [IRQ_LPC32XX_GPIO_01] = {
 130                 .event_group = &lpc32xx_event_int_regs,
 131                 .mask = LPC32XX_CLKPWR_INTSRC_GPIO_01_BIT,
 132         },
 133         [IRQ_LPC32XX_GPIO_02] = {
 134                 .event_group = &lpc32xx_event_int_regs,
 135                 .mask = LPC32XX_CLKPWR_INTSRC_GPIO_02_BIT,
 136         },
 137         [IRQ_LPC32XX_GPIO_03] = {
 138                 .event_group = &lpc32xx_event_int_regs,
 139                 .mask = LPC32XX_CLKPWR_INTSRC_GPIO_03_BIT,
 140         },
 141         [IRQ_LPC32XX_GPIO_04] = {
 142                 .event_group = &lpc32xx_event_int_regs,
 143                 .mask = LPC32XX_CLKPWR_INTSRC_GPIO_04_BIT,
 144         },
 145         [IRQ_LPC32XX_GPIO_05] = {
 146                 .event_group = &lpc32xx_event_int_regs,
 147                 .mask = LPC32XX_CLKPWR_INTSRC_GPIO_05_BIT,
 148         },
 149         [IRQ_LPC32XX_KEY] = {
 150                 .event_group = &lpc32xx_event_int_regs,
 151                 .mask = LPC32XX_CLKPWR_INTSRC_KEY_BIT,
 152         },
 153         [IRQ_LPC32XX_USB_OTG_ATX] = {
 154                 .event_group = &lpc32xx_event_int_regs,
 155                 .mask = LPC32XX_CLKPWR_INTSRC_USBATXINT_BIT,
 156         },
 157         [IRQ_LPC32XX_USB_HOST] = {
 158                 .event_group = &lpc32xx_event_int_regs,
 159                 .mask = LPC32XX_CLKPWR_INTSRC_USB_BIT,
 160         },
 161         [IRQ_LPC32XX_RTC] = {
 162                 .event_group = &lpc32xx_event_int_regs,
 163                 .mask = LPC32XX_CLKPWR_INTSRC_RTC_BIT,
 164         },
 165         [IRQ_LPC32XX_MSTIMER] = {
 166                 .event_group = &lpc32xx_event_int_regs,
 167                 .mask = LPC32XX_CLKPWR_INTSRC_MSTIMER_BIT,
 168         },
 169         [IRQ_LPC32XX_TS_AUX] = {
 170                 .event_group = &lpc32xx_event_int_regs,
 171                 .mask = LPC32XX_CLKPWR_INTSRC_TS_AUX_BIT,
 172         },
 173         [IRQ_LPC32XX_TS_P] = {
 174                 .event_group = &lpc32xx_event_int_regs,
 175                 .mask = LPC32XX_CLKPWR_INTSRC_TS_P_BIT,
 176         },
 177         [IRQ_LPC32XX_TS_IRQ] = {
 178                 .event_group = &lpc32xx_event_int_regs,
 179                 .mask = LPC32XX_CLKPWR_INTSRC_ADC_BIT,
 180         },
 181 };
 182
 183 static void get_controller(unsigned int irq, unsigned int *base,
 184         unsigned int *irqbit)
 185 {
 186         if (irq < 32) {
 187                 *base = LPC32XX_MIC_BASE;
 188                 *irqbit = 1 << irq;
 189         } else if (irq < 64) {
 190                 *base = LPC32XX_SIC1_BASE;
 191                 *irqbit = 1 << (irq - 32);
 192         } else {
 193                 *base = LPC32XX_SIC2_BASE;
 194                 *irqbit = 1 << (irq - 64);
 195         }
 196 }
 197
 198 static void lpc32xx_mask_irq(struct irq_data *d)
 199 {
 200         unsigned int reg, ctrl, mask;
 201
 202         get_controller(d->irq, &ctrl, &mask);
 203
 204         reg = __raw_readl(LPC32XX_INTC_MASK(ctrl)) & ~mask;
 205         __raw_writel(reg, LPC32XX_INTC_MASK(ctrl));
 206 }
 207
 208 static void lpc32xx_unmask_irq(struct irq_data *d)
 209 {
 210         unsigned int reg, ctrl, mask;
 211
 212         get_controller(d->irq, &ctrl, &mask);
 213
 214         reg = __raw_readl(LPC32XX_INTC_MASK(ctrl)) | mask;
 215         __raw_writel(reg, LPC32XX_INTC_MASK(ctrl));
 216 }
 217
 218 static void lpc32xx_ack_irq(struct irq_data *d)
 219 {
 220         unsigned int ctrl, mask;
 221
 222         get_controller(d->irq, &ctrl, &mask);
 223
 224         __raw_writel(mask, LPC32XX_INTC_RAW_STAT(ctrl));
 225
 226         /* Also need to clear pending wake event */
 227         if (lpc32xx_events[d->irq].mask != 0)
 228                 __raw_writel(lpc32xx_events[d->irq].mask,
 229                         lpc32xx_events[d->irq].event_group->rawstat_reg);
 230 }
 231
 232 static void __lpc32xx_set_irq_type(unsigned int irq, int use_high_level,
 233         int use_edge)
 234 {
 235         unsigned int reg, ctrl, mask;
 236
 237         get_controller(irq, &ctrl, &mask);
 238
 239         /* Activation level, high or low */
 240         reg = __raw_readl(LPC32XX_INTC_POLAR(ctrl));
 241         if (use_high_level)
 242                 reg |= mask;
 243         else
 244                 reg &= ~mask;
 245         __raw_writel(reg, LPC32XX_INTC_POLAR(ctrl));
 246
 247         /* Activation type, edge or level */
 248         reg = __raw_readl(LPC32XX_INTC_ACT_TYPE(ctrl));
 249         if (use_edge)
 250                 reg |= mask;
 251         else
 252                 reg &= ~mask;
 253         __raw_writel(reg, LPC32XX_INTC_ACT_TYPE(ctrl));
 254
 255         /* Use same polarity for the wake events */
 256         if (lpc32xx_events[irq].mask != 0) {
 257                 reg = __raw_readl(lpc32xx_events[irq].event_group->edge_reg);
 258
 259                 if (use_high_level)
 260                         reg |= lpc32xx_events[irq].mask;
 261                 else
 262                         reg &= ~lpc32xx_events[irq].mask;
 263
 264                 __raw_writel(reg, lpc32xx_events[irq].event_group->edge_reg);
 265         }
 266 }
 267
 268 static int lpc32xx_set_irq_type(struct irq_data *d, unsigned int type)
 269 {
 270         switch (type) {
 271         case IRQ_TYPE_EDGE_RISING:
 272                 /* Rising edge sensitive */
 273                 __lpc32xx_set_irq_type(d->irq, 1, 1);
 274                 break;
 275
 276         case IRQ_TYPE_EDGE_FALLING:
 277                 /* Falling edge sensitive */
 278                 __lpc32xx_set_irq_type(d->irq, 0, 1);
 279                 break;
 280
 281         case IRQ_TYPE_LEVEL_LOW:
 282                 /* Low level sensitive */
 283                 __lpc32xx_set_irq_type(d->irq, 0, 0);
 284                 break;
 285
 286         case IRQ_TYPE_LEVEL_HIGH:
 287                 /* High level sensitive */
 288                 __lpc32xx_set_irq_type(d->irq, 1, 0);
 289                 break;
 290
 291         /* Other modes are not supported */
 292         default:
 293                 return -EINVAL;
 294         }
 295
 296         /* Ok to use the level handler for all types */
 297         irq_set_handler(d->irq, handle_level_irq);
 298
 299         return 0;
 300 }
 301
 302 static int lpc32xx_irq_wake(struct irq_data *d, unsigned int state)
 303 {
 304         unsigned long eventreg;
 305
 306         if (lpc32xx_events[d->irq].mask != 0) {
 307                 eventreg = __raw_readl(lpc32xx_events[d->irq].
 308                         event_group->enab_reg);
 309
 310                 if (state)
 311                         eventreg |= lpc32xx_events[d->irq].mask;
 312                 else {
 313                         eventreg &= ~lpc32xx_events[d->irq].mask;
 314
 315                         /*
 316                          * When disabling the wakeup, clear the latched
 317                          * event
 318                          */
 319                         __raw_writel(lpc32xx_events[d->irq].mask,
 320                                 lpc32xx_events[d->irq].
 321                                 event_group->rawstat_reg);
 322                 }
 323
 324                 __raw_writel(eventreg,
 325                         lpc32xx_events[d->irq].event_group->enab_reg);
 326
 327                 return 0;
 328         }
 329
 330         /* Clear event */
 331         __raw_writel(lpc32xx_events[d->irq].mask,
 332                 lpc32xx_events[d->irq].event_group->rawstat_reg);
 333
 334         return -ENODEV;
 335 }
 336
 337 static void __init lpc32xx_set_default_mappings(unsigned int apr,
 338         unsigned int atr, unsigned int offset)
 339 {
 340         unsigned int i;
 341
 342         /* Set activation levels for each interrupt */
 343         i = 0;
 344         while (i < 32) {
 345                 __lpc32xx_set_irq_type(offset + i, ((apr >> i) & 0x1),
 346                         ((atr >> i) & 0x1));
 347                 i++;
 348         }
 349 }
 350
 351 static struct irq_chip lpc32xx_irq_chip = {
 352         .irq_ack = lpc32xx_ack_irq,
 353         .irq_mask = lpc32xx_mask_irq,
 354         .irq_unmask = lpc32xx_unmask_irq,
 355         .irq_set_type = lpc32xx_set_irq_type,
 356         .irq_set_wake = lpc32xx_irq_wake
 357 };
 358
 359 static void lpc32xx_sic1_handler(unsigned int irq, struct irq_desc *desc)
 360 {
 361         unsigned long ints = __raw_readl(LPC32XX_INTC_STAT(LPC32XX_SIC1_BASE));
 362
 363         while (ints != 0) {
 364                 int irqno = fls(ints) - 1;
 365
 366                 ints &= ~(1 << irqno);
 367
 368                 generic_handle_irq(LPC32XX_SIC1_IRQ(irqno));
 369         }
 370 }
 371
 372 static void lpc32xx_sic2_handler(unsigned int irq, struct irq_desc *desc)
 373 {
 374         unsigned long ints = __raw_readl(LPC32XX_INTC_STAT(LPC32XX_SIC2_BASE));
 375
 376         while (ints != 0) {
 377                 int irqno = fls(ints) - 1;
 378
 379                 ints &= ~(1 << irqno);
 380
 381                 generic_handle_irq(LPC32XX_SIC2_IRQ(irqno));
 382         }
 383 }
 384
 385 void __init lpc32xx_init_irq(void)
 386 {
 387         unsigned int i;
 388
 389         /* Setup MIC */
 390         __raw_writel(0, LPC32XX_INTC_MASK(LPC32XX_MIC_BASE));
 391         __raw_writel(MIC_APR_DEFAULT, LPC32XX_INTC_POLAR(LPC32XX_MIC_BASE));
 392         __raw_writel(MIC_ATR_DEFAULT, LPC32XX_INTC_ACT_TYPE(LPC32XX_MIC_BASE));
 393
 394         /* Setup SIC1 */
 395         __raw_writel(0, LPC32XX_INTC_MASK(LPC32XX_SIC1_BASE));
 396         __raw_writel(SIC1_APR_DEFAULT, LPC32XX_INTC_POLAR(LPC32XX_SIC1_BASE));
 397         __raw_writel(SIC1_ATR_DEFAULT,
 398                                 LPC32XX_INTC_ACT_TYPE(LPC32XX_SIC1_BASE));
 399
 400         /* Setup SIC2 */
 401         __raw_writel(0, LPC32XX_INTC_MASK(LPC32XX_SIC2_BASE));
 402         __raw_writel(SIC2_APR_DEFAULT, LPC32XX_INTC_POLAR(LPC32XX_SIC2_BASE));
 403         __raw_writel(SIC2_ATR_DEFAULT,
 404                                 LPC32XX_INTC_ACT_TYPE(LPC32XX_SIC2_BASE));
 405
 406         /* Configure supported IRQ's */
 407         for (i = 0; i < NR_IRQS; i++) {
 408                 irq_set_chip_and_handler(i, &lpc32xx_irq_chip,
 409                                          handle_level_irq);
 410                 set_irq_flags(i, IRQF_VALID);
 411         }
 412
 413         /* Set default mappings */
 414         lpc32xx_set_default_mappings(MIC_APR_DEFAULT, MIC_ATR_DEFAULT, 0);
 415         lpc32xx_set_default_mappings(SIC1_APR_DEFAULT, SIC1_ATR_DEFAULT, 32);
 416         lpc32xx_set_default_mappings(SIC2_APR_DEFAULT, SIC2_ATR_DEFAULT, 64);
 417
 418         /* mask all interrupts except SUBIRQ */
 419         __raw_writel(0, LPC32XX_INTC_MASK(LPC32XX_MIC_BASE));
 420         __raw_writel(0, LPC32XX_INTC_MASK(LPC32XX_SIC1_BASE));
 421         __raw_writel(0, LPC32XX_INTC_MASK(LPC32XX_SIC2_BASE));
 422
 423         /* MIC SUBIRQx interrupts will route handling to the chain handlers */
 424         irq_set_chained_handler(IRQ_LPC32XX_SUB1IRQ, lpc32xx_sic1_handler);
 425         irq_set_chained_handler(IRQ_LPC32XX_SUB2IRQ, lpc32xx_sic2_handler);
 426
 427         /* Initially disable all wake events */
 428         __raw_writel(0, LPC32XX_CLKPWR_P01_ER);
 429         __raw_writel(0, LPC32XX_CLKPWR_INT_ER);
 430         __raw_writel(0, LPC32XX_CLKPWR_PIN_ER);
 431
 432         /*
 433          * Default wake activation polarities, all pin sources are low edge
 434          * triggered
 435          */
 436         __raw_writel(LPC32XX_CLKPWR_INTSRC_TS_P_BIT |
 437                 LPC32XX_CLKPWR_INTSRC_MSTIMER_BIT |
 438                 LPC32XX_CLKPWR_INTSRC_RTC_BIT,
 439                 LPC32XX_CLKPWR_INT_AP);
 440         __raw_writel(0, LPC32XX_CLKPWR_PIN_AP);
 441
 442         /* Clear latched wake event states */
 443         __raw_writel(__raw_readl(LPC32XX_CLKPWR_PIN_RS),
 444                 LPC32XX_CLKPWR_PIN_RS);
 445         __raw_writel(__raw_readl(LPC32XX_CLKPWR_INT_RS),
 446                 LPC32XX_CLKPWR_INT_RS);
 447 }