drivers/video/sh_mobile_meram.c

   1 /*
   2  * SuperH Mobile MERAM Driver for SuperH Mobile LCDC Driver
   3  *
   4  * Copyright (c) 2011   Damian Hobson-Garcia <dhobsong@igel.co.jp>
   5  *                      Takanari Hayama <taki@igel.co.jp>
   6  *
   7  * This file is subject to the terms and conditions of the GNU General Public
   8  * License.  See the file "COPYING" in the main directory of this archive
   9  * for more details.
  10  */
  11
  12 #include <linux/kernel.h>
  13 #include <linux/module.h>
  14 #include <linux/device.h>
  15 #include <linux/pm_runtime.h>
  16 #include <linux/io.h>
  17 #include <linux/slab.h>
  18 #include <linux/platform_device.h>
  19
  20 #include "sh_mobile_meram.h"
  21
  22 /* meram registers */
  23 #define MEVCR1                  0x4
  24 #define MEVCR1_RST              (1 << 31)
  25 #define MEVCR1_WD               (1 << 30)
  26 #define MEVCR1_AMD1             (1 << 29)
  27 #define MEVCR1_AMD0             (1 << 28)
  28 #define MEQSEL1                 0x40
  29 #define MEQSEL2                 0x44
  30
  31 #define MExxCTL                 0x400
  32 #define MExxCTL_BV              (1 << 31)
  33 #define MExxCTL_BSZ_SHIFT       28
  34 #define MExxCTL_MSAR_MASK       (0x7ff << MExxCTL_MSAR_SHIFT)
  35 #define MExxCTL_MSAR_SHIFT      16
  36 #define MExxCTL_NXT_MASK        (0x1f << MExxCTL_NXT_SHIFT)
  37 #define MExxCTL_NXT_SHIFT       11
  38 #define MExxCTL_WD1             (1 << 10)
  39 #define MExxCTL_WD0             (1 << 9)
  40 #define MExxCTL_WS              (1 << 8)
  41 #define MExxCTL_CB              (1 << 7)
  42 #define MExxCTL_WBF             (1 << 6)
  43 #define MExxCTL_WF              (1 << 5)
  44 #define MExxCTL_RF              (1 << 4)
  45 #define MExxCTL_CM              (1 << 3)
  46 #define MExxCTL_MD_READ         (1 << 0)
  47 #define MExxCTL_MD_WRITE        (2 << 0)
  48 #define MExxCTL_MD_ICB_WB       (3 << 0)
  49 #define MExxCTL_MD_ICB          (4 << 0)
  50 #define MExxCTL_MD_FB           (7 << 0)
  51 #define MExxCTL_MD_MASK         (7 << 0)
  52 #define MExxBSIZE               0x404
  53 #define MExxBSIZE_RCNT_SHIFT    28
  54 #define MExxBSIZE_YSZM1_SHIFT   16
  55 #define MExxBSIZE_XSZM1_SHIFT   0
  56 #define MExxMNCF                0x408
  57 #define MExxMNCF_KWBNM_SHIFT    28
  58 #define MExxMNCF_KRBNM_SHIFT    24
  59 #define MExxMNCF_BNM_SHIFT      16
  60 #define MExxMNCF_XBV            (1 << 15)
  61 #define MExxMNCF_CPL_YCBCR444   (1 << 12)
  62 #define MExxMNCF_CPL_YCBCR420   (2 << 12)
  63 #define MExxMNCF_CPL_YCBCR422   (3 << 12)
  64 #define MExxMNCF_CPL_MSK        (3 << 12)
  65 #define MExxMNCF_BL             (1 << 2)
  66 #define MExxMNCF_LNM_SHIFT      0
  67 #define MExxSARA                0x410
  68 #define MExxSARB                0x414
  69 #define MExxSBSIZE              0x418
  70 #define MExxSBSIZE_HDV          (1 << 31)
  71 #define MExxSBSIZE_HSZ16        (0 << 28)
  72 #define MExxSBSIZE_HSZ32        (1 << 28)
  73 #define MExxSBSIZE_HSZ64        (2 << 28)
  74 #define MExxSBSIZE_HSZ128       (3 << 28)
  75 #define MExxSBSIZE_SBSIZZ_SHIFT 0
  76
  77 #define MERAM_MExxCTL_VAL(next, addr)   \
  78         ((((next) << MExxCTL_NXT_SHIFT) & MExxCTL_NXT_MASK) | \
  79          (((addr) << MExxCTL_MSAR_SHIFT) & MExxCTL_MSAR_MASK))
  80 #define MERAM_MExxBSIZE_VAL(rcnt, yszm1, xszm1) \
  81         (((rcnt) << MExxBSIZE_RCNT_SHIFT) | \
  82          ((yszm1) << MExxBSIZE_YSZM1_SHIFT) | \
  83          ((xszm1) << MExxBSIZE_XSZM1_SHIFT))
  84
  85 static unsigned long common_regs[] = {
  86         MEVCR1,
  87         MEQSEL1,
  88         MEQSEL2,
  89 };
  90 #define CMN_REGS_SIZE ARRAY_SIZE(common_regs)
  91
  92 static unsigned long icb_regs[] = {
  93         MExxCTL,
  94         MExxBSIZE,
  95         MExxMNCF,
  96         MExxSARA,
  97         MExxSARB,
  98         MExxSBSIZE,
  99 };
 100 #define ICB_REGS_SIZE ARRAY_SIZE(icb_regs)
 101
 102 struct sh_mobile_meram_priv {
 103         void __iomem    *base;
 104         struct mutex    lock;
 105         unsigned long   used_icb;
 106         int             used_meram_cache_regions;
 107         unsigned long   used_meram_cache[SH_MOBILE_MERAM_ICB_NUM];
 108         unsigned long   cmn_saved_regs[CMN_REGS_SIZE];
 109         unsigned long   icb_saved_regs[ICB_REGS_SIZE * SH_MOBILE_MERAM_ICB_NUM];
 110 };
 111
 112 /* settings */
 113 #define MERAM_SEC_LINE 15
 114 #define MERAM_LINE_WIDTH 2048
 115
 116 /*
 117  * MERAM/ICB access functions
 118  */
 119
 120 #define MERAM_ICB_OFFSET(base, idx, off)        ((base) + (off) + (idx) * 0x20)
 121
 122 static inline void meram_write_icb(void __iomem *base, int idx, int off,
 123         unsigned long val)
 124 {
 125         iowrite32(val, MERAM_ICB_OFFSET(base, idx, off));
 126 }
 127
 128 static inline unsigned long meram_read_icb(void __iomem *base, int idx, int off)
 129 {
 130         return ioread32(MERAM_ICB_OFFSET(base, idx, off));
 131 }
 132
 133 static inline void meram_write_reg(void __iomem *base, int off,
 134                 unsigned long val)
 135 {
 136         iowrite32(val, base + off);
 137 }
 138
 139 static inline unsigned long meram_read_reg(void __iomem *base, int off)
 140 {
 141         return ioread32(base + off);
 142 }
 143
 144 /*
 145  * register ICB
 146  */
 147
 148 #define MERAM_CACHE_START(p)     ((p) >> 16)
 149 #define MERAM_CACHE_END(p)       ((p) & 0xffff)
 150 #define MERAM_CACHE_SET(o, s)    ((((o) & 0xffff) << 16) | \
 151                                   (((o) + (s) - 1) & 0xffff))
 152
 153 /*
 154  * check if there's no overlaps in MERAM allocation.
 155  */
 156
 157 static inline int meram_check_overlap(struct sh_mobile_meram_priv *priv,
 158                                       struct sh_mobile_meram_icb *new)
 159 {
 160         int i;
 161         int used_start, used_end, meram_start, meram_end;
 162
 163         /* valid ICB? */
 164         if (new->marker_icb & ~0x1f || new->cache_icb & ~0x1f)
 165                 return 1;
 166
 167         if (test_bit(new->marker_icb, &priv->used_icb) ||
 168                         test_bit(new->cache_icb,  &priv->used_icb))
 169                 return  1;
 170
 171         for (i = 0; i < priv->used_meram_cache_regions; i++) {
 172                 used_start = MERAM_CACHE_START(priv->used_meram_cache[i]);
 173                 used_end   = MERAM_CACHE_END(priv->used_meram_cache[i]);
 174                 meram_start = new->meram_offset;
 175                 meram_end   = new->meram_offset + new->meram_size;
 176
 177                 if ((meram_start >= used_start && meram_start < used_end) ||
 178                         (meram_end > used_start && meram_end < used_end))
 179                         return 1;
 180         }
 181
 182         return 0;
 183 }
 184
 185 /*
 186  * mark the specified ICB as used
 187  */
 188
 189 static inline void meram_mark(struct sh_mobile_meram_priv *priv,
 190                               struct sh_mobile_meram_icb *new)
 191 {
 192         int n;
 193
 194         if (new->marker_icb < 0 || new->cache_icb < 0)
 195                 return;
 196
 197         __set_bit(new->marker_icb, &priv->used_icb);
 198         __set_bit(new->cache_icb, &priv->used_icb);
 199
 200         n = priv->used_meram_cache_regions;
 201
 202         priv->used_meram_cache[n] = MERAM_CACHE_SET(new->meram_offset,
 203                                                     new->meram_size);
 204
 205         priv->used_meram_cache_regions++;
 206 }
 207
 208 /*
 209  * unmark the specified ICB as used
 210  */
 211
 212 static inline void meram_unmark(struct sh_mobile_meram_priv *priv,
 213                                 struct sh_mobile_meram_icb *icb)
 214 {
 215         int i;
 216         unsigned long pattern;
 217
 218         if (icb->marker_icb < 0 || icb->cache_icb < 0)
 219                 return;
 220
 221         __clear_bit(icb->marker_icb, &priv->used_icb);
 222         __clear_bit(icb->cache_icb, &priv->used_icb);
 223
 224         pattern = MERAM_CACHE_SET(icb->meram_offset, icb->meram_size);
 225         for (i = 0; i < priv->used_meram_cache_regions; i++) {
 226                 if (priv->used_meram_cache[i] == pattern) {
 227                         while (i < priv->used_meram_cache_regions - 1) {
 228                                 priv->used_meram_cache[i] =
 229                                         priv->used_meram_cache[i + 1] ;
 230                                 i++;
 231                         }
 232                         priv->used_meram_cache[i] = 0;
 233                         priv->used_meram_cache_regions--;
 234                         break;
 235                 }
 236         }
 237 }
 238
 239 /*
 240  * is this a YCbCr(NV12, NV16 or NV24) colorspace
 241  */
 242 static inline int is_nvcolor(int cspace)
 243 {
 244         if (cspace == SH_MOBILE_MERAM_PF_NV ||
 245                         cspace == SH_MOBILE_MERAM_PF_NV24)
 246                 return 1;
 247         return 0;
 248 }
 249
 250 /*
 251  * set the next address to fetch
 252  */
 253 static inline void meram_set_next_addr(struct sh_mobile_meram_priv *priv,
 254                                        struct sh_mobile_meram_cfg *cfg,
 255                                        unsigned long base_addr_y,
 256                                        unsigned long base_addr_c)
 257 {
 258         unsigned long target;
 259
 260         target = (cfg->current_reg) ? MExxSARA : MExxSARB;
 261         cfg->current_reg ^= 1;
 262
 263         /* set the next address to fetch */
 264         meram_write_icb(priv->base, cfg->icb[0].cache_icb,  target,
 265                         base_addr_y);
 266         meram_write_icb(priv->base, cfg->icb[0].marker_icb, target,
 267                         base_addr_y + cfg->icb[0].cache_unit);
 268
 269         if (is_nvcolor(cfg->pixelformat)) {
 270                 meram_write_icb(priv->base, cfg->icb[1].cache_icb,  target,
 271                                 base_addr_c);
 272                 meram_write_icb(priv->base, cfg->icb[1].marker_icb, target,
 273                                 base_addr_c + cfg->icb[1].cache_unit);
 274         }
 275 }
 276
 277 /*
 278  * get the next ICB address
 279  */
 280 static inline void meram_get_next_icb_addr(struct sh_mobile_meram_info *pdata,
 281                                            struct sh_mobile_meram_cfg *cfg,
 282                                            unsigned long *icb_addr_y,
 283                                            unsigned long *icb_addr_c)
 284 {
 285         unsigned long icb_offset;
 286
 287         if (pdata->addr_mode == SH_MOBILE_MERAM_MODE0)
 288                 icb_offset = 0x80000000 | (cfg->current_reg << 29);
 289         else
 290                 icb_offset = 0xc0000000 | (cfg->current_reg << 23);
 291
 292         *icb_addr_y = icb_offset | (cfg->icb[0].marker_icb << 24);
 293         if (is_nvcolor(cfg->pixelformat))
 294                 *icb_addr_c = icb_offset | (cfg->icb[1].marker_icb << 24);
 295 }
 296
 297 #define MERAM_CALC_BYTECOUNT(x, y) \
 298         (((x) * (y) + (MERAM_LINE_WIDTH - 1)) & ~(MERAM_LINE_WIDTH - 1))
 299
 300 /*
 301  * initialize MERAM
 302  */
 303
 304 static int meram_init(struct sh_mobile_meram_priv *priv,
 305                       struct sh_mobile_meram_icb *icb,
 306                       int xres, int yres, int *out_pitch)
 307 {
 308         unsigned long total_byte_count = MERAM_CALC_BYTECOUNT(xres, yres);
 309         unsigned long bnm;
 310         int lcdc_pitch, xpitch, line_cnt;
 311         int save_lines;
 312
 313         /* adjust pitch to 1024, 2048, 4096 or 8192 */
 314         lcdc_pitch = (xres - 1) | 1023;
 315         lcdc_pitch = lcdc_pitch | (lcdc_pitch >> 1);
 316         lcdc_pitch = lcdc_pitch | (lcdc_pitch >> 2);
 317         lcdc_pitch += 1;
 318
 319         /* derive settings */
 320         if (lcdc_pitch == 8192 && yres >= 1024) {
 321                 lcdc_pitch = xpitch = MERAM_LINE_WIDTH;
 322                 line_cnt = total_byte_count >> 11;
 323                 *out_pitch = xres;
 324                 save_lines = (icb->meram_size / 16 / MERAM_SEC_LINE);
 325                 save_lines *= MERAM_SEC_LINE;
 326         } else {
 327                 xpitch = xres;
 328                 line_cnt = yres;
 329                 *out_pitch = lcdc_pitch;
 330                 save_lines = icb->meram_size / (lcdc_pitch >> 10) / 2;
 331                 save_lines &= 0xff;
 332         }
 333         bnm = (save_lines - 1) << 16;
 334
 335         /* TODO: we better to check if we have enough MERAM buffer size */
 336
 337         /* set up ICB */
 338         meram_write_icb(priv->base, icb->cache_icb,  MExxBSIZE,
 339                         MERAM_MExxBSIZE_VAL(0x0, line_cnt - 1, xpitch - 1));
 340         meram_write_icb(priv->base, icb->marker_icb, MExxBSIZE,
 341                         MERAM_MExxBSIZE_VAL(0xf, line_cnt - 1, xpitch - 1));
 342
 343         meram_write_icb(priv->base, icb->cache_icb,  MExxMNCF, bnm);
 344         meram_write_icb(priv->base, icb->marker_icb, MExxMNCF, bnm);
 345
 346         meram_write_icb(priv->base, icb->cache_icb,  MExxSBSIZE, xpitch);
 347         meram_write_icb(priv->base, icb->marker_icb, MExxSBSIZE, xpitch);
 348
 349         /* save a cache unit size */
 350         icb->cache_unit = xres * save_lines;
 351
 352         /*
 353          * Set MERAM for framebuffer
 354          *
 355          * we also chain the cache_icb and the marker_icb.
 356          * we also split the allocated MERAM buffer between two ICBs.
 357          */
 358         meram_write_icb(priv->base, icb->cache_icb, MExxCTL,
 359                         MERAM_MExxCTL_VAL(icb->marker_icb, icb->meram_offset) |
 360                         MExxCTL_WD1 | MExxCTL_WD0 | MExxCTL_WS | MExxCTL_CM |
 361                         MExxCTL_MD_FB);
 362         meram_write_icb(priv->base, icb->marker_icb, MExxCTL,
 363                         MERAM_MExxCTL_VAL(icb->cache_icb, icb->meram_offset +
 364                                           icb->meram_size / 2) |
 365                         MExxCTL_WD1 | MExxCTL_WD0 | MExxCTL_WS | MExxCTL_CM |
 366                         MExxCTL_MD_FB);
 367
 368         return 0;
 369 }
 370
 371 static void meram_deinit(struct sh_mobile_meram_priv *priv,
 372                         struct sh_mobile_meram_icb *icb)
 373 {
 374         /* disable ICB */
 375         meram_write_icb(priv->base, icb->cache_icb,  MExxCTL, 0);
 376         meram_write_icb(priv->base, icb->marker_icb, MExxCTL, 0);
 377         icb->cache_unit = 0;
 378 }
 379
 380 /*
 381  * register the ICB
 382  */
 383
 384 static int sh_mobile_meram_register(struct sh_mobile_meram_info *pdata,
 385                                     struct sh_mobile_meram_cfg *cfg,
 386                                     int xres, int yres, int pixelformat,
 387                                     unsigned long base_addr_y,
 388                                     unsigned long base_addr_c,
 389                                     unsigned long *icb_addr_y,
 390                                     unsigned long *icb_addr_c,
 391                                     int *pitch)
 392 {
 393         struct platform_device *pdev;
 394         struct sh_mobile_meram_priv *priv;
 395         int n, out_pitch;
 396         int error = 0;
 397
 398         if (!pdata || !pdata->priv || !pdata->pdev || !cfg)
 399                 return -EINVAL;
 400
 401         if (pixelformat != SH_MOBILE_MERAM_PF_NV &&
 402             pixelformat != SH_MOBILE_MERAM_PF_NV24 &&
 403             pixelformat != SH_MOBILE_MERAM_PF_RGB)
 404                 return -EINVAL;
 405
 406         priv = pdata->priv;
 407         pdev = pdata->pdev;
 408
 409         dev_dbg(&pdev->dev, "registering %dx%d (%s) (y=%08lx, c=%08lx)",
 410                 xres, yres, (!pixelformat) ? "yuv" : "rgb",
 411                 base_addr_y, base_addr_c);
 412
 413         mutex_lock(&priv->lock);
 414
 415         /* we can't handle wider than 8192px */
 416         if (xres > 8192) {
 417                 dev_err(&pdev->dev, "width exceeding the limit (> 8192).");
 418                 error = -EINVAL;
 419                 goto err;
 420         }
 421
 422         if (priv->used_meram_cache_regions + 2 > SH_MOBILE_MERAM_ICB_NUM) {
 423                 dev_err(&pdev->dev, "no more ICB available.");
 424                 error = -EINVAL;
 425                 goto err;
 426         }
 427
 428         /* do we have at least one ICB config? */
 429         if (cfg->icb[0].marker_icb < 0 || cfg->icb[0].cache_icb < 0) {
 430                 dev_err(&pdev->dev, "at least one ICB is required.");
 431                 error = -EINVAL;
 432                 goto err;
 433         }
 434
 435         /* make sure that there's no overlaps */
 436         if (meram_check_overlap(priv, &cfg->icb[0])) {
 437                 dev_err(&pdev->dev, "conflicting config detected.");
 438                 error = -EINVAL;
 439                 goto err;
 440         }
 441         n = 1;
 442
 443         /* do the same if we have the second ICB set */
 444         if (cfg->icb[1].marker_icb >= 0 && cfg->icb[1].cache_icb >= 0) {
 445                 if (meram_check_overlap(priv, &cfg->icb[1])) {
 446                         dev_err(&pdev->dev, "conflicting config detected.");
 447                         error = -EINVAL;
 448                         goto err;
 449                 }
 450                 n = 2;
 451         }
 452
 453         if (is_nvcolor(pixelformat) && n != 2) {
 454                 dev_err(&pdev->dev, "requires two ICB sets for planar Y/C.");
 455                 error =  -EINVAL;
 456                 goto err;
 457         }
 458
 459         /* we now register the ICB */
 460         cfg->pixelformat = pixelformat;
 461         meram_mark(priv, &cfg->icb[0]);
 462         if (is_nvcolor(pixelformat))
 463                 meram_mark(priv, &cfg->icb[1]);
 464
 465         /* initialize MERAM */
 466         meram_init(priv, &cfg->icb[0], xres, yres, &out_pitch);
 467         *pitch = out_pitch;
 468         if (pixelformat == SH_MOBILE_MERAM_PF_NV)
 469                 meram_init(priv, &cfg->icb[1], xres, (yres + 1) / 2,
 470                         &out_pitch);
 471         else if (pixelformat == SH_MOBILE_MERAM_PF_NV24)
 472                 meram_init(priv, &cfg->icb[1], 2 * xres, (yres + 1) / 2,
 473                         &out_pitch);
 474
 475         cfg->current_reg = 1;
 476         meram_set_next_addr(priv, cfg, base_addr_y, base_addr_c);
 477         meram_get_next_icb_addr(pdata, cfg, icb_addr_y, icb_addr_c);
 478
 479         dev_dbg(&pdev->dev, "registered - can access via y=%08lx, c=%08lx",
 480                 *icb_addr_y, *icb_addr_c);
 481
 482 err:
 483         mutex_unlock(&priv->lock);
 484         return error;
 485 }
 486
 487 static int sh_mobile_meram_unregister(struct sh_mobile_meram_info *pdata,
 488                                       struct sh_mobile_meram_cfg *cfg)
 489 {
 490         struct sh_mobile_meram_priv *priv;
 491
 492         if (!pdata || !pdata->priv || !cfg)
 493                 return -EINVAL;
 494
 495         priv = pdata->priv;
 496
 497         mutex_lock(&priv->lock);
 498
 499         /* deinit & unmark */
 500         if (is_nvcolor(cfg->pixelformat)) {
 501                 meram_deinit(priv, &cfg->icb[1]);
 502                 meram_unmark(priv, &cfg->icb[1]);
 503         }
 504         meram_deinit(priv, &cfg->icb[0]);
 505         meram_unmark(priv, &cfg->icb[0]);
 506
 507         mutex_unlock(&priv->lock);
 508
 509         return 0;
 510 }
 511
 512 static int sh_mobile_meram_update(struct sh_mobile_meram_info *pdata,
 513                                   struct sh_mobile_meram_cfg *cfg,
 514                                   unsigned long base_addr_y,
 515                                   unsigned long base_addr_c,
 516                                   unsigned long *icb_addr_y,
 517                                   unsigned long *icb_addr_c)
 518 {
 519         struct sh_mobile_meram_priv *priv;
 520
 521         if (!pdata || !pdata->priv || !cfg)
 522                 return -EINVAL;
 523
 524         priv = pdata->priv;
 525
 526         mutex_lock(&priv->lock);
 527
 528         meram_set_next_addr(priv, cfg, base_addr_y, base_addr_c);
 529         meram_get_next_icb_addr(pdata, cfg, icb_addr_y, icb_addr_c);
 530
 531         mutex_unlock(&priv->lock);
 532
 533         return 0;
 534 }
 535
 536 static int sh_mobile_meram_runtime_suspend(struct device *dev)
 537 {
 538         struct platform_device *pdev = to_platform_device(dev);
 539         struct sh_mobile_meram_priv *priv = platform_get_drvdata(pdev);
 540         int k, j;
 541
 542         for (k = 0; k < CMN_REGS_SIZE; k++)
 543                 priv->cmn_saved_regs[k] = meram_read_reg(priv->base,
 544                         common_regs[k]);
 545
 546         for (j = 0; j < 32; j++) {
 547                 if (!test_bit(j, &priv->used_icb))
 548                         continue;
 549                 for (k = 0; k < ICB_REGS_SIZE; k++) {
 550                         priv->icb_saved_regs[j * ICB_REGS_SIZE + k] =
 551                                 meram_read_icb(priv->base, j, icb_regs[k]);
 552                         /* Reset ICB on resume */
 553                         if (icb_regs[k] == MExxCTL)
 554                                 priv->icb_saved_regs[j * ICB_REGS_SIZE + k] =
 555                                         MExxCTL_WBF | MExxCTL_WF | MExxCTL_RF;
 556                 }
 557         }
 558         return 0;
 559 }
 560
 561 static int sh_mobile_meram_runtime_resume(struct device *dev)
 562 {
 563         struct platform_device *pdev = to_platform_device(dev);
 564         struct sh_mobile_meram_priv *priv = platform_get_drvdata(pdev);
 565         int k, j;
 566
 567         for (j = 0; j < 32; j++) {
 568                 if (!test_bit(j, &priv->used_icb))
 569                         continue;
 570                 for (k = 0; k < ICB_REGS_SIZE; k++) {
 571                         meram_write_icb(priv->base, j, icb_regs[k],
 572                         priv->icb_saved_regs[j * ICB_REGS_SIZE + k]);
 573                 }
 574         }
 575
 576         for (k = 0; k < CMN_REGS_SIZE; k++)
 577                 meram_write_reg(priv->base, common_regs[k],
 578                         priv->cmn_saved_regs[k]);
 579         return 0;
 580 }
 581
 582 static const struct dev_pm_ops sh_mobile_meram_dev_pm_ops = {
 583         .runtime_suspend = sh_mobile_meram_runtime_suspend,
 584         .runtime_resume = sh_mobile_meram_runtime_resume,
 585 };
 586
 587 static struct sh_mobile_meram_ops sh_mobile_meram_ops = {
 588         .module                 = THIS_MODULE,
 589         .meram_register         = sh_mobile_meram_register,
 590         .meram_unregister       = sh_mobile_meram_unregister,
 591         .meram_update           = sh_mobile_meram_update,
 592 };
 593
 594 /*
 595  * initialize MERAM
 596  */
 597
 598 static int sh_mobile_meram_remove(struct platform_device *pdev);
 599
 600 static int __devinit sh_mobile_meram_probe(struct platform_device *pdev)
 601 {
 602         struct sh_mobile_meram_priv *priv;
 603         struct sh_mobile_meram_info *pdata = pdev->dev.platform_data;
 604         struct resource *res;
 605         int error;
 606
 607         if (!pdata) {
 608                 dev_err(&pdev->dev, "no platform data defined\n");
 609                 return -EINVAL;
 610         }
 611
 612         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 613         if (!res) {
 614                 dev_err(&pdev->dev, "cannot get platform resources\n");
 615                 return -ENOENT;
 616         }
 617
 618         priv = kzalloc(sizeof(*priv), GFP_KERNEL);
 619         if (!priv) {
 620                 dev_err(&pdev->dev, "cannot allocate device data\n");
 621                 return -ENOMEM;
 622         }
 623
 624         platform_set_drvdata(pdev, priv);
 625
 626         /* initialize private data */
 627         mutex_init(&priv->lock);
 628         priv->base = ioremap_nocache(res->start, resource_size(res));
 629         if (!priv->base) {
 630                 dev_err(&pdev->dev, "ioremap failed\n");
 631                 error = -EFAULT;
 632                 goto err;
 633         }
 634         pdata->ops = &sh_mobile_meram_ops;
 635         pdata->priv = priv;
 636         pdata->pdev = pdev;
 637
 638         /* initialize ICB addressing mode */
 639         if (pdata->addr_mode == SH_MOBILE_MERAM_MODE1)
 640                 meram_write_reg(priv->base, MEVCR1, MEVCR1_AMD1);
 641
 642         pm_runtime_enable(&pdev->dev);
 643
 644         dev_info(&pdev->dev, "sh_mobile_meram initialized.");
 645
 646         return 0;
 647
 648 err:
 649         sh_mobile_meram_remove(pdev);
 650
 651         return error;
 652 }
 653
 654
 655 static int sh_mobile_meram_remove(struct platform_device *pdev)
 656 {
 657         struct sh_mobile_meram_priv *priv = platform_get_drvdata(pdev);
 658
 659         pm_runtime_disable(&pdev->dev);
 660
 661         if (priv->base)
 662                 iounmap(priv->base);
 663
 664         mutex_destroy(&priv->lock);
 665
 666         kfree(priv);
 667
 668         return 0;
 669 }
 670
 671 static struct platform_driver sh_mobile_meram_driver = {
 672         .driver = {
 673                 .name           = "sh_mobile_meram",
 674                 .owner          = THIS_MODULE,
 675                 .pm             = &sh_mobile_meram_dev_pm_ops,
 676         },
 677         .probe          = sh_mobile_meram_probe,
 678         .remove         = sh_mobile_meram_remove,
 679 };
 680
 681 static int __init sh_mobile_meram_init(void)
 682 {
 683         return platform_driver_register(&sh_mobile_meram_driver);
 684 }
 685
 686 static void __exit sh_mobile_meram_exit(void)
 687 {
 688         platform_driver_unregister(&sh_mobile_meram_driver);
 689 }
 690
 691 module_init(sh_mobile_meram_init);
 692 module_exit(sh_mobile_meram_exit);
 693
 694 MODULE_DESCRIPTION("SuperH Mobile MERAM driver");
 695 MODULE_AUTHOR("Damian Hobson-Garcia / Takanari Hayama");
 696 MODULE_LICENSE("GPL v2");