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   1 /*
   2  *  linux/drivers/mtd/onenand/omap2.c
   3  *
   4  *  OneNAND driver for OMAP2 / OMAP3
   5  *
   6  *  Copyright © 2005-2006 Nokia Corporation
   7  *
   8  *  Author: Jarkko Lavinen <jarkko.lavinen@nokia.com> and Juha Yrjölä
   9  *  IRQ and DMA support written by Timo Teras
  10  *
  11  * This program is free software; you can redistribute it and/or modify it
  12  * under the terms of the GNU General Public License version 2 as published by
  13  * the Free Software Foundation.
  14  *
  15  * This program is distributed in the hope that it will be useful, but WITHOUT
  16  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  17  * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
  18  * more details.
  19  *
  20  * You should have received a copy of the GNU General Public License along with
  21  * this program; see the file COPYING. If not, write to the Free Software
  22  * Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  23  *
  24  */
  25
  26 #include <linux/device.h>
  27 #include <linux/module.h>
  28 #include <linux/init.h>
  29 #include <linux/mtd/mtd.h>
  30 #include <linux/mtd/onenand.h>
  31 #include <linux/mtd/partitions.h>
  32 #include <linux/platform_device.h>
  33 #include <linux/interrupt.h>
  34 #include <linux/delay.h>
  35 #include <linux/dma-mapping.h>
  36 #include <linux/io.h>
  37
  38 #include <asm/mach/flash.h>
  39 #include <mach/gpmc.h>
  40 #include <mach/onenand.h>
  41 #include <mach/gpio.h>
  42 #include <mach/pm.h>
  43
  44 #include <mach/dma.h>
  45
  46 #include <mach/board.h>
  47
  48 #define DRIVER_NAME "omap2-onenand"
  49
  50 #define ONENAND_IO_SIZE         SZ_128K
  51 #define ONENAND_BUFRAM_SIZE     (1024 * 5)
  52
  53 struct omap2_onenand {
  54         struct platform_device *pdev;
  55         int gpmc_cs;
  56         unsigned long phys_base;
  57         int gpio_irq;
  58         struct mtd_info mtd;
  59         struct mtd_partition *parts;
  60         struct onenand_chip onenand;
  61         struct completion irq_done;
  62         struct completion dma_done;
  63         int dma_channel;
  64         int freq;
  65         int (*setup)(void __iomem *base, int freq);
  66 };
  67
  68 static void omap2_onenand_dma_cb(int lch, u16 ch_status, void *data)
  69 {
  70         struct omap2_onenand *c = data;
  71
  72         complete(&c->dma_done);
  73 }
  74
  75 static irqreturn_t omap2_onenand_interrupt(int irq, void *dev_id)
  76 {
  77         struct omap2_onenand *c = dev_id;
  78
  79         complete(&c->irq_done);
  80
  81         return IRQ_HANDLED;
  82 }
  83
  84 static inline unsigned short read_reg(struct omap2_onenand *c, int reg)
  85 {
  86         return readw(c->onenand.base + reg);
  87 }
  88
  89 static inline void write_reg(struct omap2_onenand *c, unsigned short value,
  90                              int reg)
  91 {
  92         writew(value, c->onenand.base + reg);
  93 }
  94
  95 static void wait_err(char *msg, int state, unsigned int ctrl, unsigned int intr)
  96 {
  97         printk(KERN_ERR "onenand_wait: %s! state %d ctrl 0x%04x intr 0x%04x\n",
  98                msg, state, ctrl, intr);
  99 }
 100
 101 static void wait_warn(char *msg, int state, unsigned int ctrl,
 102                       unsigned int intr)
 103 {
 104         printk(KERN_WARNING "onenand_wait: %s! state %d ctrl 0x%04x "
 105                "intr 0x%04x\n", msg, state, ctrl, intr);
 106 }
 107
 108 static int omap2_onenand_wait(struct mtd_info *mtd, int state)
 109 {
 110         struct omap2_onenand *c = container_of(mtd, struct omap2_onenand, mtd);
 111         unsigned int intr = 0;
 112         unsigned int ctrl;
 113         unsigned long timeout;
 114         u32 syscfg;
 115
 116         if (state == FL_RESETING) {
 117                 int i;
 118
 119                 for (i = 0; i < 20; i++) {
 120                         udelay(1);
 121                         intr = read_reg(c, ONENAND_REG_INTERRUPT);
 122                         if (intr & ONENAND_INT_MASTER)
 123                                 break;
 124                 }
 125                 ctrl = read_reg(c, ONENAND_REG_CTRL_STATUS);
 126                 if (ctrl & ONENAND_CTRL_ERROR) {
 127                         wait_err("controller error", state, ctrl, intr);
 128                         return -EIO;
 129                 }
 130                 if (!(intr & ONENAND_INT_RESET)) {
 131                         wait_err("timeout", state, ctrl, intr);
 132                         return -EIO;
 133                 }
 134                 return 0;
 135         }
 136
 137         if (state != FL_READING) {
 138                 int result;
 139
 140                 /* Turn interrupts on */
 141                 syscfg = read_reg(c, ONENAND_REG_SYS_CFG1);
 142                 if (!(syscfg & ONENAND_SYS_CFG1_IOBE)) {
 143                         syscfg |= ONENAND_SYS_CFG1_IOBE;
 144                         write_reg(c, syscfg, ONENAND_REG_SYS_CFG1);
 145                         if (cpu_is_omap34xx())
 146                                 /* Add a delay to let GPIO settle */
 147                                 syscfg = read_reg(c, ONENAND_REG_SYS_CFG1);
 148                 }
 149
 150                 INIT_COMPLETION(c->irq_done);
 151                 if (c->gpio_irq) {
 152                         result = gpio_get_value(c->gpio_irq);
 153                         if (result == -1) {
 154                                 ctrl = read_reg(c, ONENAND_REG_CTRL_STATUS);
 155                                 intr = read_reg(c, ONENAND_REG_INTERRUPT);
 156                                 wait_err("gpio error", state, ctrl, intr);
 157                                 return -EIO;
 158                         }
 159                 } else
 160                         result = 0;
 161                 if (result == 0) {
 162                         int retry_cnt = 0;
 163 retry:
 164                         result = wait_for_completion_timeout(&c->irq_done,
 165                                                     msecs_to_jiffies(20));
 166                         if (result == 0) {
 167                                 /* Timeout after 20ms */
 168                                 ctrl = read_reg(c, ONENAND_REG_CTRL_STATUS);
 169                                 if (ctrl & ONENAND_CTRL_ONGO) {
 170                                         /*
 171                                          * The operation seems to be still going
 172                                          * so give it some more time.
 173                                          */
 174                                         retry_cnt += 1;
 175                                         if (retry_cnt < 3)
 176                                                 goto retry;
 177                                         intr = read_reg(c,
 178                                                         ONENAND_REG_INTERRUPT);
 179                                         wait_err("timeout", state, ctrl, intr);
 180                                         return -EIO;
 181                                 }
 182                                 intr = read_reg(c, ONENAND_REG_INTERRUPT);
 183                                 if ((intr & ONENAND_INT_MASTER) == 0)
 184                                         wait_warn("timeout", state, ctrl, intr);
 185                         }
 186                 }
 187         } else {
 188                 int retry_cnt = 0;
 189
 190                 /* Turn interrupts off */
 191                 syscfg = read_reg(c, ONENAND_REG_SYS_CFG1);
 192                 syscfg &= ~ONENAND_SYS_CFG1_IOBE;
 193                 write_reg(c, syscfg, ONENAND_REG_SYS_CFG1);
 194
 195                 timeout = jiffies + msecs_to_jiffies(20);
 196                 while (1) {
 197                         if (time_before(jiffies, timeout)) {
 198                                 intr = read_reg(c, ONENAND_REG_INTERRUPT);
 199                                 if (intr & ONENAND_INT_MASTER)
 200                                         break;
 201                         } else {
 202                                 /* Timeout after 20ms */
 203                                 ctrl = read_reg(c, ONENAND_REG_CTRL_STATUS);
 204                                 if (ctrl & ONENAND_CTRL_ONGO) {
 205                                         /*
 206                                          * The operation seems to be still going
 207                                          * so give it some more time.
 208                                          */
 209                                         retry_cnt += 1;
 210                                         if (retry_cnt < 3) {
 211                                                 timeout = jiffies +
 212                                                           msecs_to_jiffies(20);
 213                                                 continue;
 214                                         }
 215                                 }
 216                                 break;
 217                         }
 218                 }
 219         }
 220
 221         intr = read_reg(c, ONENAND_REG_INTERRUPT);
 222         ctrl = read_reg(c, ONENAND_REG_CTRL_STATUS);
 223
 224         if (intr & ONENAND_INT_READ) {
 225                 int ecc = read_reg(c, ONENAND_REG_ECC_STATUS);
 226
 227                 if (ecc) {
 228                         unsigned int addr1, addr8;
 229
 230                         addr1 = read_reg(c, ONENAND_REG_START_ADDRESS1);
 231                         addr8 = read_reg(c, ONENAND_REG_START_ADDRESS8);
 232                         if (ecc & ONENAND_ECC_2BIT_ALL) {
 233                                 printk(KERN_ERR "onenand_wait: ECC error = "
 234                                        "0x%04x, addr1 %#x, addr8 %#x\n",
 235                                        ecc, addr1, addr8);
 236                                 mtd->ecc_stats.failed++;
 237                                 return -EBADMSG;
 238                         } else if (ecc & ONENAND_ECC_1BIT_ALL) {
 239                                 printk(KERN_NOTICE "onenand_wait: correctable "
 240                                        "ECC error = 0x%04x, addr1 %#x, "
 241                                        "addr8 %#x\n", ecc, addr1, addr8);
 242                                 mtd->ecc_stats.corrected++;
 243                         }
 244                 }
 245         } else if (state == FL_READING) {
 246                 wait_err("timeout", state, ctrl, intr);
 247                 return -EIO;
 248         }
 249
 250         if (ctrl & ONENAND_CTRL_ERROR) {
 251                 wait_err("controller error", state, ctrl, intr);
 252                 if (ctrl & ONENAND_CTRL_LOCK)
 253                         printk(KERN_ERR "onenand_wait: "
 254                                         "Device is write protected!!!\n");
 255                 return -EIO;
 256         }
 257
 258         if (ctrl & 0xFE9F)
 259                 wait_warn("unexpected controller status", state, ctrl, intr);
 260
 261         return 0;
 262 }
 263
 264 static inline int omap2_onenand_bufferram_offset(struct mtd_info *mtd, int area)
 265 {
 266         struct onenand_chip *this = mtd->priv;
 267
 268         if (ONENAND_CURRENT_BUFFERRAM(this)) {
 269                 if (area == ONENAND_DATARAM)
 270                         return mtd->writesize;
 271                 if (area == ONENAND_SPARERAM)
 272                         return mtd->oobsize;
 273         }
 274
 275         return 0;
 276 }
 277
 278 #if defined(CONFIG_ARCH_OMAP3) || defined(MULTI_OMAP2)
 279
 280 static int omap3_onenand_read_bufferram(struct mtd_info *mtd, int area,
 281                                         unsigned char *buffer, int offset,
 282                                         size_t count)
 283 {
 284         struct omap2_onenand *c = container_of(mtd, struct omap2_onenand, mtd);
 285         struct onenand_chip *this = mtd->priv;
 286         dma_addr_t dma_src, dma_dst;
 287         int bram_offset;
 288         unsigned long timeout;
 289         void *buf = (void *)buffer;
 290         size_t xtra;
 291         volatile unsigned *done;
 292
 293         bram_offset = omap2_onenand_bufferram_offset(mtd, area) + area + offset;
 294         if (bram_offset & 3 || (size_t)buf & 3 || count < 384)
 295                 goto out_copy;
 296
 297         if (buf >= high_memory) {
 298                 struct page *p1;
 299
 300                 if (((size_t)buf & PAGE_MASK) !=
 301                     ((size_t)(buf + count - 1) & PAGE_MASK))
 302                         goto out_copy;
 303                 p1 = vmalloc_to_page(buf);
 304                 if (!p1)
 305                         goto out_copy;
 306                 buf = page_address(p1) + ((size_t)buf & ~PAGE_MASK);
 307         }
 308
 309         xtra = count & 3;
 310         if (xtra) {
 311                 count -= xtra;
 312                 memcpy(buf + count, this->base + bram_offset + count, xtra);
 313         }
 314
 315         dma_src = c->phys_base + bram_offset;
 316         dma_dst = dma_map_single(&c->pdev->dev, buf, count, DMA_FROM_DEVICE);
 317         if (dma_mapping_error(&c->pdev->dev, dma_dst)) {
 318                 dev_err(&c->pdev->dev,
 319                         "Couldn't DMA map a %d byte buffer\n",
 320                         count);
 321                 goto out_copy;
 322         }
 323
 324         omap_set_dma_transfer_params(c->dma_channel, OMAP_DMA_DATA_TYPE_S32,
 325                                      count >> 2, 1, 0, 0, 0);
 326         omap_set_dma_src_params(c->dma_channel, 0, OMAP_DMA_AMODE_POST_INC,
 327                                 dma_src, 0, 0);
 328         omap_set_dma_dest_params(c->dma_channel, 0, OMAP_DMA_AMODE_POST_INC,
 329                                  dma_dst, 0, 0);
 330
 331         INIT_COMPLETION(c->dma_done);
 332         omap_start_dma(c->dma_channel);
 333
 334         timeout = jiffies + msecs_to_jiffies(20);
 335         done = &c->dma_done.done;
 336         while (time_before(jiffies, timeout))
 337                 if (*done)
 338                         break;
 339
 340         dma_unmap_single(&c->pdev->dev, dma_dst, count, DMA_FROM_DEVICE);
 341
 342         if (!*done) {
 343                 dev_err(&c->pdev->dev, "timeout waiting for DMA\n");
 344                 goto out_copy;
 345         }
 346
 347         return 0;
 348
 349 out_copy:
 350         memcpy(buf, this->base + bram_offset, count);
 351         return 0;
 352 }
 353
 354 static int omap3_onenand_write_bufferram(struct mtd_info *mtd, int area,
 355                                          const unsigned char *buffer,
 356                                          int offset, size_t count)
 357 {
 358         struct omap2_onenand *c = container_of(mtd, struct omap2_onenand, mtd);
 359         struct onenand_chip *this = mtd->priv;
 360         dma_addr_t dma_src, dma_dst;
 361         int bram_offset;
 362         unsigned long timeout;
 363         void *buf = (void *)buffer;
 364         volatile unsigned *done;
 365
 366         bram_offset = omap2_onenand_bufferram_offset(mtd, area) + area + offset;
 367         if (bram_offset & 3 || (size_t)buf & 3 || count < 384)
 368                 goto out_copy;
 369
 370         /* panic_write() may be in an interrupt context */
 371         if (in_interrupt())
 372                 goto out_copy;
 373
 374         if (buf >= high_memory) {
 375                 struct page *p1;
 376
 377                 if (((size_t)buf & PAGE_MASK) !=
 378                     ((size_t)(buf + count - 1) & PAGE_MASK))
 379                         goto out_copy;
 380                 p1 = vmalloc_to_page(buf);
 381                 if (!p1)
 382                         goto out_copy;
 383                 buf = page_address(p1) + ((size_t)buf & ~PAGE_MASK);
 384         }
 385
 386         dma_src = dma_map_single(&c->pdev->dev, buf, count, DMA_TO_DEVICE);
 387         dma_dst = c->phys_base + bram_offset;
 388         if (dma_mapping_error(&c->pdev->dev, dma_dst)) {
 389                 dev_err(&c->pdev->dev,
 390                         "Couldn't DMA map a %d byte buffer\n",
 391                         count);
 392                 return -1;
 393         }
 394
 395         omap_set_dma_transfer_params(c->dma_channel, OMAP_DMA_DATA_TYPE_S32,
 396                                      count >> 2, 1, 0, 0, 0);
 397         omap_set_dma_src_params(c->dma_channel, 0, OMAP_DMA_AMODE_POST_INC,
 398                                 dma_src, 0, 0);
 399         omap_set_dma_dest_params(c->dma_channel, 0, OMAP_DMA_AMODE_POST_INC,
 400                                  dma_dst, 0, 0);
 401
 402         INIT_COMPLETION(c->dma_done);
 403         omap_start_dma(c->dma_channel);
 404
 405         timeout = jiffies + msecs_to_jiffies(20);
 406         done = &c->dma_done.done;
 407         while (time_before(jiffies, timeout))
 408                 if (*done)
 409                         break;
 410
 411         dma_unmap_single(&c->pdev->dev, dma_dst, count, DMA_TO_DEVICE);
 412
 413         if (!*done) {
 414                 dev_err(&c->pdev->dev, "timeout waiting for DMA\n");
 415                 goto out_copy;
 416         }
 417
 418         return 0;
 419
 420 out_copy:
 421         memcpy(this->base + bram_offset, buf, count);
 422         return 0;
 423 }
 424
 425 #else
 426
 427 int omap3_onenand_read_bufferram(struct mtd_info *mtd, int area,
 428                                  unsigned char *buffer, int offset,
 429                                  size_t count);
 430
 431 int omap3_onenand_write_bufferram(struct mtd_info *mtd, int area,
 432                                   const unsigned char *buffer,
 433                                   int offset, size_t count);
 434
 435 #endif
 436
 437 #if defined(CONFIG_ARCH_OMAP2) || defined(MULTI_OMAP2)
 438
 439 static int omap2_onenand_read_bufferram(struct mtd_info *mtd, int area,
 440                                         unsigned char *buffer, int offset,
 441                                         size_t count)
 442 {
 443         struct omap2_onenand *c = container_of(mtd, struct omap2_onenand, mtd);
 444         struct onenand_chip *this = mtd->priv;
 445         dma_addr_t dma_src, dma_dst;
 446         int bram_offset;
 447
 448         bram_offset = omap2_onenand_bufferram_offset(mtd, area) + area + offset;
 449         /* DMA is not used.  Revisit PM requirements before enabling it. */
 450         if (1 || (c->dma_channel < 0) ||
 451             ((void *) buffer >= (void *) high_memory) || (bram_offset & 3) ||
 452             (((unsigned int) buffer) & 3) || (count < 1024) || (count & 3)) {
 453                 memcpy(buffer, (__force void *)(this->base + bram_offset),
 454                        count);
 455                 return 0;
 456         }
 457
 458         dma_src = c->phys_base + bram_offset;
 459         dma_dst = dma_map_single(&c->pdev->dev, buffer, count,
 460                                  DMA_FROM_DEVICE);
 461         if (dma_mapping_error(&c->pdev->dev, dma_dst)) {
 462                 dev_err(&c->pdev->dev,
 463                         "Couldn't DMA map a %d byte buffer\n",
 464                         count);
 465                 return -1;
 466         }
 467
 468         omap_set_dma_transfer_params(c->dma_channel, OMAP_DMA_DATA_TYPE_S32,
 469                                      count / 4, 1, 0, 0, 0);
 470         omap_set_dma_src_params(c->dma_channel, 0, OMAP_DMA_AMODE_POST_INC,
 471                                 dma_src, 0, 0);
 472         omap_set_dma_dest_params(c->dma_channel, 0, OMAP_DMA_AMODE_POST_INC,
 473                                  dma_dst, 0, 0);
 474
 475         INIT_COMPLETION(c->dma_done);
 476         omap_start_dma(c->dma_channel);
 477         wait_for_completion(&c->dma_done);
 478
 479         dma_unmap_single(&c->pdev->dev, dma_dst, count, DMA_FROM_DEVICE);
 480
 481         return 0;
 482 }
 483
 484 static int omap2_onenand_write_bufferram(struct mtd_info *mtd, int area,
 485                                          const unsigned char *buffer,
 486                                          int offset, size_t count)
 487 {
 488         struct omap2_onenand *c = container_of(mtd, struct omap2_onenand, mtd);
 489         struct onenand_chip *this = mtd->priv;
 490         dma_addr_t dma_src, dma_dst;
 491         int bram_offset;
 492
 493         bram_offset = omap2_onenand_bufferram_offset(mtd, area) + area + offset;
 494         /* DMA is not used.  Revisit PM requirements before enabling it. */
 495         if (1 || (c->dma_channel < 0) ||
 496             ((void *) buffer >= (void *) high_memory) || (bram_offset & 3) ||
 497             (((unsigned int) buffer) & 3) || (count < 1024) || (count & 3)) {
 498                 memcpy((__force void *)(this->base + bram_offset), buffer,
 499                        count);
 500                 return 0;
 501         }
 502
 503         dma_src = dma_map_single(&c->pdev->dev, (void *) buffer, count,
 504                                  DMA_TO_DEVICE);
 505         dma_dst = c->phys_base + bram_offset;
 506         if (dma_mapping_error(&c->pdev->dev, dma_dst)) {
 507                 dev_err(&c->pdev->dev,
 508                         "Couldn't DMA map a %d byte buffer\n",
 509                         count);
 510                 return -1;
 511         }
 512
 513         omap_set_dma_transfer_params(c->dma_channel, OMAP_DMA_DATA_TYPE_S16,
 514                                      count / 2, 1, 0, 0, 0);
 515         omap_set_dma_src_params(c->dma_channel, 0, OMAP_DMA_AMODE_POST_INC,
 516                                 dma_src, 0, 0);
 517         omap_set_dma_dest_params(c->dma_channel, 0, OMAP_DMA_AMODE_POST_INC,
 518                                  dma_dst, 0, 0);
 519
 520         INIT_COMPLETION(c->dma_done);
 521         omap_start_dma(c->dma_channel);
 522         wait_for_completion(&c->dma_done);
 523
 524         dma_unmap_single(&c->pdev->dev, dma_dst, count, DMA_TO_DEVICE);
 525
 526         return 0;
 527 }
 528
 529 #else
 530
 531 int omap2_onenand_read_bufferram(struct mtd_info *mtd, int area,
 532                                  unsigned char *buffer, int offset,
 533                                  size_t count);
 534
 535 int omap2_onenand_write_bufferram(struct mtd_info *mtd, int area,
 536                                   const unsigned char *buffer,
 537                                   int offset, size_t count);
 538
 539 #endif
 540
 541 static struct platform_driver omap2_onenand_driver;
 542
 543 static int __adjust_timing(struct device *dev, void *data)
 544 {
 545         int ret = 0;
 546         struct omap2_onenand *c;
 547
 548         c = dev_get_drvdata(dev);
 549
 550         BUG_ON(c->setup == NULL);
 551
 552         /* DMA is not in use so this is all that is needed */
 553         /* Revisit for OMAP3! */
 554         ret = c->setup(c->onenand.base, c->freq);
 555
 556         return ret;
 557 }
 558
 559 int omap2_onenand_rephase(void)
 560 {
 561         return driver_for_each_device(&omap2_onenand_driver.driver, NULL,
 562                                       NULL, __adjust_timing);
 563 }
 564
 565 static void __devexit omap2_onenand_shutdown(struct platform_device *pdev)
 566 {
 567         struct omap2_onenand *c = dev_get_drvdata(&pdev->dev);
 568
 569         /* With certain content in the buffer RAM, the OMAP boot ROM code
 570          * can recognize the flash chip incorrectly. Zero it out before
 571          * soft reset.
 572          */
 573         memset((__force void *)c->onenand.base, 0, ONENAND_BUFRAM_SIZE);
 574 }
 575
 576 static int __devinit omap2_onenand_probe(struct platform_device *pdev)
 577 {
 578         struct omap_onenand_platform_data *pdata;
 579         struct omap2_onenand *c;
 580         int r;
 581
 582         pdata = pdev->dev.platform_data;
 583         if (pdata == NULL) {
 584                 dev_err(&pdev->dev, "platform data missing\n");
 585                 return -ENODEV;
 586         }
 587
 588         c = kzalloc(sizeof(struct omap2_onenand), GFP_KERNEL);
 589         if (!c)
 590                 return -ENOMEM;
 591
 592         init_completion(&c->irq_done);
 593         init_completion(&c->dma_done);
 594         c->gpmc_cs = pdata->cs;
 595         c->gpio_irq = pdata->gpio_irq;
 596         c->dma_channel = pdata->dma_channel;
 597         if (c->dma_channel < 0) {
 598                 /* if -1, don't use DMA */
 599                 c->gpio_irq = 0;
 600         }
 601
 602         r = gpmc_cs_request(c->gpmc_cs, ONENAND_IO_SIZE, &c->phys_base);
 603         if (r < 0) {
 604                 dev_err(&pdev->dev, "Cannot request GPMC CS\n");
 605                 goto err_kfree;
 606         }
 607
 608         if (request_mem_region(c->phys_base, ONENAND_IO_SIZE,
 609                                pdev->dev.driver->name) == NULL) {
 610                 dev_err(&pdev->dev, "Cannot reserve memory region at 0x%08lx, "
 611                         "size: 0x%x\n", c->phys_base, ONENAND_IO_SIZE);
 612                 r = -EBUSY;
 613                 goto err_free_cs;
 614         }
 615         c->onenand.base = ioremap(c->phys_base, ONENAND_IO_SIZE);
 616         if (c->onenand.base == NULL) {
 617                 r = -ENOMEM;
 618                 goto err_release_mem_region;
 619         }
 620
 621         if (pdata->onenand_setup != NULL) {
 622                 r = pdata->onenand_setup(c->onenand.base, c->freq);
 623                 if (r < 0) {
 624                         dev_err(&pdev->dev, "Onenand platform setup failed: "
 625                                 "%d\n", r);
 626                         goto err_iounmap;
 627                 }
 628                 c->setup = pdata->onenand_setup;
 629         }
 630
 631         if (c->gpio_irq) {
 632                 if ((r = gpio_request(c->gpio_irq, "OneNAND irq")) < 0) {
 633                         dev_err(&pdev->dev,  "Failed to request GPIO%d for "
 634                                 "OneNAND\n", c->gpio_irq);
 635                         goto err_iounmap;
 636         }
 637         gpio_direction_input(c->gpio_irq);
 638
 639         if ((r = request_irq(gpio_to_irq(c->gpio_irq),
 640                              omap2_onenand_interrupt, IRQF_TRIGGER_RISING,
 641                              pdev->dev.driver->name, c)) < 0)
 642                 goto err_release_gpio;
 643         }
 644
 645         if (c->dma_channel >= 0) {
 646                 r = omap_request_dma(0, pdev->dev.driver->name,
 647                                      omap2_onenand_dma_cb, (void *) c,
 648                                      &c->dma_channel);
 649                 if (r == 0) {
 650                         omap_set_dma_write_mode(c->dma_channel,
 651                                                 OMAP_DMA_WRITE_NON_POSTED);
 652                         omap_set_dma_src_data_pack(c->dma_channel, 1);
 653                         omap_set_dma_src_burst_mode(c->dma_channel,
 654                                                     OMAP_DMA_DATA_BURST_8);
 655                         omap_set_dma_dest_data_pack(c->dma_channel, 1);
 656                         omap_set_dma_dest_burst_mode(c->dma_channel,
 657                                                      OMAP_DMA_DATA_BURST_8);
 658                 } else {
 659                         dev_info(&pdev->dev,
 660                                  "failed to allocate DMA for OneNAND, "
 661                                  "using PIO instead\n");
 662                         c->dma_channel = -1;
 663                 }
 664         }
 665
 666         dev_info(&pdev->dev, "initializing on CS%d, phys base 0x%08lx, virtual "
 667                  "base %p\n", c->gpmc_cs, c->phys_base,
 668                  c->onenand.base);
 669
 670         c->pdev = pdev;
 671         c->mtd.name = dev_name(&pdev->dev);
 672         c->mtd.priv = &c->onenand;
 673         c->mtd.owner = THIS_MODULE;
 674
 675         if (c->dma_channel >= 0) {
 676                 struct onenand_chip *this = &c->onenand;
 677
 678                 this->wait = omap2_onenand_wait;
 679                 if (cpu_is_omap34xx()) {
 680                         this->read_bufferram = omap3_onenand_read_bufferram;
 681                         this->write_bufferram = omap3_onenand_write_bufferram;
 682                 } else {
 683                         this->read_bufferram = omap2_onenand_read_bufferram;
 684                         this->write_bufferram = omap2_onenand_write_bufferram;
 685                 }
 686         }
 687
 688         if ((r = onenand_scan(&c->mtd, 1)) < 0)
 689                 goto err_release_dma;
 690
 691         switch ((c->onenand.version_id >> 4) & 0xf) {
 692         case 0:
 693                 c->freq = 40;
 694                 break;
 695         case 1:
 696                 c->freq = 54;
 697                 break;
 698         case 2:
 699                 c->freq = 66;
 700                 break;
 701         case 3:
 702                 c->freq = 83;
 703                 break;
 704         }
 705
 706 #ifdef CONFIG_MTD_PARTITIONS
 707         if (pdata->parts != NULL)
 708                 r = add_mtd_partitions(&c->mtd, pdata->parts,
 709                                        pdata->nr_parts);
 710         else
 711 #endif
 712                 r = add_mtd_device(&c->mtd);
 713         if (r < 0)
 714                 goto err_release_onenand;
 715
 716         platform_set_drvdata(pdev, c);
 717
 718         return 0;
 719
 720 err_release_onenand:
 721         onenand_release(&c->mtd);
 722 err_release_dma:
 723         if (c->dma_channel != -1)
 724                 omap_free_dma(c->dma_channel);
 725         if (c->gpio_irq)
 726                 free_irq(gpio_to_irq(c->gpio_irq), c);
 727 err_release_gpio:
 728         if (c->gpio_irq)
 729                 gpio_free(c->gpio_irq);
 730 err_iounmap:
 731         iounmap(c->onenand.base);
 732 err_release_mem_region:
 733         release_mem_region(c->phys_base, ONENAND_IO_SIZE);
 734 err_free_cs:
 735         gpmc_cs_free(c->gpmc_cs);
 736 err_kfree:
 737         kfree(c);
 738
 739         return r;
 740 }
 741
 742 static int __devexit omap2_onenand_remove(struct platform_device *pdev)
 743 {
 744         struct omap2_onenand *c = dev_get_drvdata(&pdev->dev);
 745
 746         BUG_ON(c == NULL);
 747
 748 #ifdef CONFIG_MTD_PARTITIONS
 749         if (c->parts)
 750                 del_mtd_partitions(&c->mtd);
 751         else
 752                 del_mtd_device(&c->mtd);
 753 #else
 754         del_mtd_device(&c->mtd);
 755 #endif
 756
 757         onenand_release(&c->mtd);
 758         if (c->dma_channel != -1)
 759                 omap_free_dma(c->dma_channel);
 760         omap2_onenand_shutdown(pdev);
 761         platform_set_drvdata(pdev, NULL);
 762         if (c->gpio_irq) {
 763                 free_irq(gpio_to_irq(c->gpio_irq), c);
 764                 gpio_free(c->gpio_irq);
 765         }
 766         iounmap(c->onenand.base);
 767         release_mem_region(c->phys_base, ONENAND_IO_SIZE);
 768         kfree(c);
 769
 770         return 0;
 771 }
 772
 773 static struct platform_driver omap2_onenand_driver = {
 774         .probe          = omap2_onenand_probe,
 775         .remove         = omap2_onenand_remove,
 776         .shutdown       = omap2_onenand_shutdown,
 777         .driver         = {
 778                 .name   = DRIVER_NAME,
 779                 .owner  = THIS_MODULE,
 780         },
 781 };
 782
 783 static int __init omap2_onenand_init(void)
 784 {
 785         printk(KERN_INFO "OneNAND driver initializing\n");
 786         return platform_driver_register(&omap2_onenand_driver);
 787 }
 788
 789 static void __exit omap2_onenand_exit(void)
 790 {
 791         platform_driver_unregister(&omap2_onenand_driver);
 792 }
 793
 794 module_init(omap2_onenand_init);
 795 module_exit(omap2_onenand_exit);
 796
 797 MODULE_ALIAS(DRIVER_NAME);
 798 MODULE_LICENSE("GPL");
 799 MODULE_AUTHOR("Jarkko Lavinen <jarkko.lavinen@nokia.com>");
 800 MODULE_DESCRIPTION("Glue layer for OneNAND flash on OMAP2 / OMAP3");