drivers/mtd/onenand/omap2.c

   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
  43 #include <mach/dma.h>
  44
  45 #include <mach/board.h>
  46
  47 #define DRIVER_NAME "omap2-onenand"
  48
  49 #define ONENAND_IO_SIZE         SZ_128K
  50 #define ONENAND_BUFRAM_SIZE     (1024 * 5)
  51
  52 struct omap2_onenand {
  53         struct platform_device *pdev;
  54         int gpmc_cs;
  55         unsigned long phys_base;
  56         int gpio_irq;
  57         struct mtd_info mtd;
  58         struct mtd_partition *parts;
  59         struct onenand_chip onenand;
  60         struct completion irq_done;
  61         struct completion dma_done;
  62         int dma_channel;
  63         int freq;
  64         int (*setup)(void __iomem *base, int freq);
  65 };
  66
  67 static void omap2_onenand_dma_cb(int lch, u16 ch_status, void *data)
  68 {
  69         struct omap2_onenand *c = data;
  70
  71         complete(&c->dma_done);
  72 }
  73
  74 static irqreturn_t omap2_onenand_interrupt(int irq, void *dev_id)
  75 {
  76         struct omap2_onenand *c = dev_id;
  77
  78         complete(&c->irq_done);
  79
  80         return IRQ_HANDLED;
  81 }
  82
  83 static inline unsigned short read_reg(struct omap2_onenand *c, int reg)
  84 {
  85         return readw(c->onenand.base + reg);
  86 }
  87
  88 static inline void write_reg(struct omap2_onenand *c, unsigned short value,
  89                              int reg)
  90 {
  91         writew(value, c->onenand.base + reg);
  92 }
  93
  94 static void wait_err(char *msg, int state, unsigned int ctrl, unsigned int intr)
  95 {
  96         printk(KERN_ERR "onenand_wait: %s! state %d ctrl 0x%04x intr 0x%04x\n",
  97                msg, state, ctrl, intr);
  98 }
  99
 100 static void wait_warn(char *msg, int state, unsigned int ctrl,
 101                       unsigned int intr)
 102 {
 103         printk(KERN_WARNING "onenand_wait: %s! state %d ctrl 0x%04x "
 104                "intr 0x%04x\n", msg, state, ctrl, intr);
 105 }
 106
 107 static int omap2_onenand_wait(struct mtd_info *mtd, int state)
 108 {
 109         struct omap2_onenand *c = container_of(mtd, struct omap2_onenand, mtd);
 110         unsigned int intr = 0;
 111         unsigned int ctrl;
 112         unsigned long timeout;
 113         u32 syscfg;
 114
 115         if (state == FL_RESETING) {
 116                 int i;
 117
 118                 for (i = 0; i < 20; i++) {
 119                         udelay(1);
 120                         intr = read_reg(c, ONENAND_REG_INTERRUPT);
 121                         if (intr & ONENAND_INT_MASTER)
 122                                 break;
 123                 }
 124                 ctrl = read_reg(c, ONENAND_REG_CTRL_STATUS);
 125                 if (ctrl & ONENAND_CTRL_ERROR) {
 126                         wait_err("controller error", state, ctrl, intr);
 127                         return -EIO;
 128                 }
 129                 if (!(intr & ONENAND_INT_RESET)) {
 130                         wait_err("timeout", state, ctrl, intr);
 131                         return -EIO;
 132                 }
 133                 return 0;
 134         }
 135
 136         if (state != FL_READING) {
 137                 int result;
 138
 139                 /* Turn interrupts on */
 140                 syscfg = read_reg(c, ONENAND_REG_SYS_CFG1);
 141                 if (!(syscfg & ONENAND_SYS_CFG1_IOBE)) {
 142                         syscfg |= ONENAND_SYS_CFG1_IOBE;
 143                         write_reg(c, syscfg, ONENAND_REG_SYS_CFG1);
 144                         if (cpu_is_omap34xx())
 145                                 /* Add a delay to let GPIO settle */
 146                                 syscfg = read_reg(c, ONENAND_REG_SYS_CFG1);
 147                 }
 148
 149                 INIT_COMPLETION(c->irq_done);
 150                 if (c->gpio_irq) {
 151                         result = gpio_get_value(c->gpio_irq);
 152                         if (result == -1) {
 153                                 ctrl = read_reg(c, ONENAND_REG_CTRL_STATUS);
 154                                 intr = read_reg(c, ONENAND_REG_INTERRUPT);
 155                                 wait_err("gpio error", state, ctrl, intr);
 156                                 return -EIO;
 157                         }
 158                 } else
 159                         result = 0;
 160                 if (result == 0) {
 161                         int retry_cnt = 0;
 162 retry:
 163                         result = wait_for_completion_timeout(&c->irq_done,
 164                                                     msecs_to_jiffies(20));
 165                         if (result == 0) {
 166                                 /* Timeout after 20ms */
 167                                 ctrl = read_reg(c, ONENAND_REG_CTRL_STATUS);
 168                                 if (ctrl & ONENAND_CTRL_ONGO) {
 169                                         /*
 170                                          * The operation seems to be still going
 171                                          * so give it some more time.
 172                                          */
 173                                         retry_cnt += 1;
 174                                         if (retry_cnt < 3)
 175                                                 goto retry;
 176                                         intr = read_reg(c,
 177                                                         ONENAND_REG_INTERRUPT);
 178                                         wait_err("timeout", state, ctrl, intr);
 179                                         return -EIO;
 180                                 }
 181                                 intr = read_reg(c, ONENAND_REG_INTERRUPT);
 182                                 if ((intr & ONENAND_INT_MASTER) == 0)
 183                                         wait_warn("timeout", state, ctrl, intr);
 184                         }
 185                 }
 186         } else {
 187                 int retry_cnt = 0;
 188
 189                 /* Turn interrupts off */
 190                 syscfg = read_reg(c, ONENAND_REG_SYS_CFG1);
 191                 syscfg &= ~ONENAND_SYS_CFG1_IOBE;
 192                 write_reg(c, syscfg, ONENAND_REG_SYS_CFG1);
 193
 194                 timeout = jiffies + msecs_to_jiffies(20);
 195                 while (1) {
 196                         if (time_before(jiffies, timeout)) {
 197                                 intr = read_reg(c, ONENAND_REG_INTERRUPT);
 198                                 if (intr & ONENAND_INT_MASTER)
 199                                         break;
 200                         } else {
 201                                 /* Timeout after 20ms */
 202                                 ctrl = read_reg(c, ONENAND_REG_CTRL_STATUS);
 203                                 if (ctrl & ONENAND_CTRL_ONGO) {
 204                                         /*
 205                                          * The operation seems to be still going
 206                                          * so give it some more time.
 207                                          */
 208                                         retry_cnt += 1;
 209                                         if (retry_cnt < 3) {
 210                                                 timeout = jiffies +
 211                                                           msecs_to_jiffies(20);
 212                                                 continue;
 213                                         }
 214                                 }
 215                                 break;
 216                         }
 217                 }
 218         }
 219
 220         intr = read_reg(c, ONENAND_REG_INTERRUPT);
 221         ctrl = read_reg(c, ONENAND_REG_CTRL_STATUS);
 222
 223         if (intr & ONENAND_INT_READ) {
 224                 int ecc = read_reg(c, ONENAND_REG_ECC_STATUS);
 225
 226                 if (ecc) {
 227                         unsigned int addr1, addr8;
 228
 229                         addr1 = read_reg(c, ONENAND_REG_START_ADDRESS1);
 230                         addr8 = read_reg(c, ONENAND_REG_START_ADDRESS8);
 231                         if (ecc & ONENAND_ECC_2BIT_ALL) {
 232                                 printk(KERN_ERR "onenand_wait: ECC error = "
 233                                        "0x%04x, addr1 %#x, addr8 %#x\n",
 234                                        ecc, addr1, addr8);
 235                                 mtd->ecc_stats.failed++;
 236                                 return -EBADMSG;
 237                         } else if (ecc & ONENAND_ECC_1BIT_ALL) {
 238                                 printk(KERN_NOTICE "onenand_wait: correctable "
 239                                        "ECC error = 0x%04x, addr1 %#x, "
 240                                        "addr8 %#x\n", ecc, addr1, addr8);
 241                                 mtd->ecc_stats.corrected++;
 242                         }
 243                 }
 244         } else if (state == FL_READING) {
 245                 wait_err("timeout", state, ctrl, intr);
 246                 return -EIO;
 247         }
 248
 249         if (ctrl & ONENAND_CTRL_ERROR) {
 250                 wait_err("controller error", state, ctrl, intr);
 251                 if (ctrl & ONENAND_CTRL_LOCK)
 252                         printk(KERN_ERR "onenand_wait: "
 253                                         "Device is write protected!!!\n");
 254                 return -EIO;
 255         }
 256
 257         if (ctrl & 0xFE9F)
 258                 wait_warn("unexpected controller status", state, ctrl, intr);
 259
 260         return 0;
 261 }
 262
 263 static inline int omap2_onenand_bufferram_offset(struct mtd_info *mtd, int area)
 264 {
 265         struct onenand_chip *this = mtd->priv;
 266
 267         if (ONENAND_CURRENT_BUFFERRAM(this)) {
 268                 if (area == ONENAND_DATARAM)
 269                         return this->writesize;
 270                 if (area == ONENAND_SPARERAM)
 271                         return mtd->oobsize;
 272         }
 273
 274         return 0;
 275 }
 276
 277 #if defined(CONFIG_ARCH_OMAP3) || defined(MULTI_OMAP2)
 278
 279 static int omap3_onenand_read_bufferram(struct mtd_info *mtd, int area,
 280                                         unsigned char *buffer, int offset,
 281                                         size_t count)
 282 {
 283         struct omap2_onenand *c = container_of(mtd, struct omap2_onenand, mtd);
 284         struct onenand_chip *this = mtd->priv;
 285         dma_addr_t dma_src, dma_dst;
 286         int bram_offset;
 287         unsigned long timeout;
 288         void *buf = (void *)buffer;
 289         size_t xtra;
 290         volatile unsigned *done;
 291
 292         bram_offset = omap2_onenand_bufferram_offset(mtd, area) + area + offset;
 293         if (bram_offset & 3 || (size_t)buf & 3 || count < 384)
 294                 goto out_copy;
 295
 296         /* panic_write() may be in an interrupt context */
 297         if (in_interrupt())
 298                 goto out_copy;
 299
 300         if (buf >= high_memory) {
 301                 struct page *p1;
 302
 303                 if (((size_t)buf & PAGE_MASK) !=
 304                     ((size_t)(buf + count - 1) & PAGE_MASK))
 305                         goto out_copy;
 306                 p1 = vmalloc_to_page(buf);
 307                 if (!p1)
 308                         goto out_copy;
 309                 buf = page_address(p1) + ((size_t)buf & ~PAGE_MASK);
 310         }
 311
 312         xtra = count & 3;
 313         if (xtra) {
 314                 count -= xtra;
 315                 memcpy(buf + count, this->base + bram_offset + count, xtra);
 316         }
 317
 318         dma_src = c->phys_base + bram_offset;
 319         dma_dst = dma_map_single(&c->pdev->dev, buf, count, DMA_FROM_DEVICE);
 320         if (dma_mapping_error(&c->pdev->dev, dma_dst)) {
 321                 dev_err(&c->pdev->dev,
 322                         "Couldn't DMA map a %d byte buffer\n",
 323                         count);
 324                 goto out_copy;
 325         }
 326
 327         omap_set_dma_transfer_params(c->dma_channel, OMAP_DMA_DATA_TYPE_S32,
 328                                      count >> 2, 1, 0, 0, 0);
 329         omap_set_dma_src_params(c->dma_channel, 0, OMAP_DMA_AMODE_POST_INC,
 330                                 dma_src, 0, 0);
 331         omap_set_dma_dest_params(c->dma_channel, 0, OMAP_DMA_AMODE_POST_INC,
 332                                  dma_dst, 0, 0);
 333
 334         INIT_COMPLETION(c->dma_done);
 335         omap_start_dma(c->dma_channel);
 336
 337         timeout = jiffies + msecs_to_jiffies(20);
 338         done = &c->dma_done.done;
 339         while (time_before(jiffies, timeout))
 340                 if (*done)
 341                         break;
 342
 343         dma_unmap_single(&c->pdev->dev, dma_dst, count, DMA_FROM_DEVICE);
 344
 345         if (!*done) {
 346                 dev_err(&c->pdev->dev, "timeout waiting for DMA\n");
 347                 goto out_copy;
 348         }
 349
 350         return 0;
 351
 352 out_copy:
 353         memcpy(buf, this->base + bram_offset, count);
 354         return 0;
 355 }
 356
 357 static int omap3_onenand_write_bufferram(struct mtd_info *mtd, int area,
 358                                          const unsigned char *buffer,
 359                                          int offset, size_t count)
 360 {
 361         struct omap2_onenand *c = container_of(mtd, struct omap2_onenand, mtd);
 362         struct onenand_chip *this = mtd->priv;
 363         dma_addr_t dma_src, dma_dst;
 364         int bram_offset;
 365         unsigned long timeout;
 366         void *buf = (void *)buffer;
 367         volatile unsigned *done;
 368
 369         bram_offset = omap2_onenand_bufferram_offset(mtd, area) + area + offset;
 370         if (bram_offset & 3 || (size_t)buf & 3 || count < 384)
 371                 goto out_copy;
 372
 373         /* panic_write() may be in an interrupt context */
 374         if (in_interrupt())
 375                 goto out_copy;
 376
 377         if (buf >= high_memory) {
 378                 struct page *p1;
 379
 380                 if (((size_t)buf & PAGE_MASK) !=
 381                     ((size_t)(buf + count - 1) & PAGE_MASK))
 382                         goto out_copy;
 383                 p1 = vmalloc_to_page(buf);
 384                 if (!p1)
 385                         goto out_copy;
 386                 buf = page_address(p1) + ((size_t)buf & ~PAGE_MASK);
 387         }
 388
 389         dma_src = dma_map_single(&c->pdev->dev, buf, count, DMA_TO_DEVICE);
 390         dma_dst = c->phys_base + bram_offset;
 391         if (dma_mapping_error(&c->pdev->dev, dma_dst)) {
 392                 dev_err(&c->pdev->dev,
 393                         "Couldn't DMA map a %d byte buffer\n",
 394                         count);
 395                 return -1;
 396         }
 397
 398         omap_set_dma_transfer_params(c->dma_channel, OMAP_DMA_DATA_TYPE_S32,
 399                                      count >> 2, 1, 0, 0, 0);
 400         omap_set_dma_src_params(c->dma_channel, 0, OMAP_DMA_AMODE_POST_INC,
 401                                 dma_src, 0, 0);
 402         omap_set_dma_dest_params(c->dma_channel, 0, OMAP_DMA_AMODE_POST_INC,
 403                                  dma_dst, 0, 0);
 404
 405         INIT_COMPLETION(c->dma_done);
 406         omap_start_dma(c->dma_channel);
 407
 408         timeout = jiffies + msecs_to_jiffies(20);
 409         done = &c->dma_done.done;
 410         while (time_before(jiffies, timeout))
 411                 if (*done)
 412                         break;
 413
 414         dma_unmap_single(&c->pdev->dev, dma_dst, count, DMA_TO_DEVICE);
 415
 416         if (!*done) {
 417                 dev_err(&c->pdev->dev, "timeout waiting for DMA\n");
 418                 goto out_copy;
 419         }
 420
 421         return 0;
 422
 423 out_copy:
 424         memcpy(this->base + bram_offset, buf, count);
 425         return 0;
 426 }
 427
 428 #else
 429
 430 int omap3_onenand_read_bufferram(struct mtd_info *mtd, int area,
 431                                  unsigned char *buffer, int offset,
 432                                  size_t count);
 433
 434 int omap3_onenand_write_bufferram(struct mtd_info *mtd, int area,
 435                                   const unsigned char *buffer,
 436                                   int offset, size_t count);
 437
 438 #endif
 439
 440 #if defined(CONFIG_ARCH_OMAP2) || defined(MULTI_OMAP2)
 441
 442 static int omap2_onenand_read_bufferram(struct mtd_info *mtd, int area,
 443                                         unsigned char *buffer, int offset,
 444                                         size_t count)
 445 {
 446         struct omap2_onenand *c = container_of(mtd, struct omap2_onenand, mtd);
 447         struct onenand_chip *this = mtd->priv;
 448         dma_addr_t dma_src, dma_dst;
 449         int bram_offset;
 450
 451         bram_offset = omap2_onenand_bufferram_offset(mtd, area) + area + offset;
 452         /* DMA is not used.  Revisit PM requirements before enabling it. */
 453         if (1 || (c->dma_channel < 0) ||
 454             ((void *) buffer >= (void *) high_memory) || (bram_offset & 3) ||
 455             (((unsigned int) buffer) & 3) || (count < 1024) || (count & 3)) {
 456                 memcpy(buffer, (__force void *)(this->base + bram_offset),
 457                        count);
 458                 return 0;
 459         }
 460
 461         dma_src = c->phys_base + bram_offset;
 462         dma_dst = dma_map_single(&c->pdev->dev, buffer, count,
 463                                  DMA_FROM_DEVICE);
 464         if (dma_mapping_error(&c->pdev->dev, dma_dst)) {
 465                 dev_err(&c->pdev->dev,
 466                         "Couldn't DMA map a %d byte buffer\n",
 467                         count);
 468                 return -1;
 469         }
 470
 471         omap_set_dma_transfer_params(c->dma_channel, OMAP_DMA_DATA_TYPE_S32,
 472                                      count / 4, 1, 0, 0, 0);
 473         omap_set_dma_src_params(c->dma_channel, 0, OMAP_DMA_AMODE_POST_INC,
 474                                 dma_src, 0, 0);
 475         omap_set_dma_dest_params(c->dma_channel, 0, OMAP_DMA_AMODE_POST_INC,
 476                                  dma_dst, 0, 0);
 477
 478         INIT_COMPLETION(c->dma_done);
 479         omap_start_dma(c->dma_channel);
 480         wait_for_completion(&c->dma_done);
 481
 482         dma_unmap_single(&c->pdev->dev, dma_dst, count, DMA_FROM_DEVICE);
 483
 484         return 0;
 485 }
 486
 487 static int omap2_onenand_write_bufferram(struct mtd_info *mtd, int area,
 488                                          const unsigned char *buffer,
 489                                          int offset, size_t count)
 490 {
 491         struct omap2_onenand *c = container_of(mtd, struct omap2_onenand, mtd);
 492         struct onenand_chip *this = mtd->priv;
 493         dma_addr_t dma_src, dma_dst;
 494         int bram_offset;
 495
 496         bram_offset = omap2_onenand_bufferram_offset(mtd, area) + area + offset;
 497         /* DMA is not used.  Revisit PM requirements before enabling it. */
 498         if (1 || (c->dma_channel < 0) ||
 499             ((void *) buffer >= (void *) high_memory) || (bram_offset & 3) ||
 500             (((unsigned int) buffer) & 3) || (count < 1024) || (count & 3)) {
 501                 memcpy((__force void *)(this->base + bram_offset), buffer,
 502                        count);
 503                 return 0;
 504         }
 505
 506         dma_src = dma_map_single(&c->pdev->dev, (void *) buffer, count,
 507                                  DMA_TO_DEVICE);
 508         dma_dst = c->phys_base + bram_offset;
 509         if (dma_mapping_error(&c->pdev->dev, dma_dst)) {
 510                 dev_err(&c->pdev->dev,
 511                         "Couldn't DMA map a %d byte buffer\n",
 512                         count);
 513                 return -1;
 514         }
 515
 516         omap_set_dma_transfer_params(c->dma_channel, OMAP_DMA_DATA_TYPE_S16,
 517                                      count / 2, 1, 0, 0, 0);
 518         omap_set_dma_src_params(c->dma_channel, 0, OMAP_DMA_AMODE_POST_INC,
 519                                 dma_src, 0, 0);
 520         omap_set_dma_dest_params(c->dma_channel, 0, OMAP_DMA_AMODE_POST_INC,
 521                                  dma_dst, 0, 0);
 522
 523         INIT_COMPLETION(c->dma_done);
 524         omap_start_dma(c->dma_channel);
 525         wait_for_completion(&c->dma_done);
 526
 527         dma_unmap_single(&c->pdev->dev, dma_dst, count, DMA_TO_DEVICE);
 528
 529         return 0;
 530 }
 531
 532 #else
 533
 534 int omap2_onenand_read_bufferram(struct mtd_info *mtd, int area,
 535                                  unsigned char *buffer, int offset,
 536                                  size_t count);
 537
 538 int omap2_onenand_write_bufferram(struct mtd_info *mtd, int area,
 539                                   const unsigned char *buffer,
 540                                   int offset, size_t count);
 541
 542 #endif
 543
 544 static struct platform_driver omap2_onenand_driver;
 545
 546 static int __adjust_timing(struct device *dev, void *data)
 547 {
 548         int ret = 0;
 549         struct omap2_onenand *c;
 550
 551         c = dev_get_drvdata(dev);
 552
 553         BUG_ON(c->setup == NULL);
 554
 555         /* DMA is not in use so this is all that is needed */
 556         /* Revisit for OMAP3! */
 557         ret = c->setup(c->onenand.base, c->freq);
 558
 559         return ret;
 560 }
 561
 562 int omap2_onenand_rephase(void)
 563 {
 564         return driver_for_each_device(&omap2_onenand_driver.driver, NULL,
 565                                       NULL, __adjust_timing);
 566 }
 567
 568 static void omap2_onenand_shutdown(struct platform_device *pdev)
 569 {
 570         struct omap2_onenand *c = dev_get_drvdata(&pdev->dev);
 571
 572         /* With certain content in the buffer RAM, the OMAP boot ROM code
 573          * can recognize the flash chip incorrectly. Zero it out before
 574          * soft reset.
 575          */
 576         memset((__force void *)c->onenand.base, 0, ONENAND_BUFRAM_SIZE);
 577 }
 578
 579 static int __devinit omap2_onenand_probe(struct platform_device *pdev)
 580 {
 581         struct omap_onenand_platform_data *pdata;
 582         struct omap2_onenand *c;
 583         int r;
 584
 585         pdata = pdev->dev.platform_data;
 586         if (pdata == NULL) {
 587                 dev_err(&pdev->dev, "platform data missing\n");
 588                 return -ENODEV;
 589         }
 590
 591         c = kzalloc(sizeof(struct omap2_onenand), GFP_KERNEL);
 592         if (!c)
 593                 return -ENOMEM;
 594
 595         init_completion(&c->irq_done);
 596         init_completion(&c->dma_done);
 597         c->gpmc_cs = pdata->cs;
 598         c->gpio_irq = pdata->gpio_irq;
 599         c->dma_channel = pdata->dma_channel;
 600         if (c->dma_channel < 0) {
 601                 /* if -1, don't use DMA */
 602                 c->gpio_irq = 0;
 603         }
 604
 605         r = gpmc_cs_request(c->gpmc_cs, ONENAND_IO_SIZE, &c->phys_base);
 606         if (r < 0) {
 607                 dev_err(&pdev->dev, "Cannot request GPMC CS\n");
 608                 goto err_kfree;
 609         }
 610
 611         if (request_mem_region(c->phys_base, ONENAND_IO_SIZE,
 612                                pdev->dev.driver->name) == NULL) {
 613                 dev_err(&pdev->dev, "Cannot reserve memory region at 0x%08lx, "
 614                         "size: 0x%x\n", c->phys_base, ONENAND_IO_SIZE);
 615                 r = -EBUSY;
 616                 goto err_free_cs;
 617         }
 618         c->onenand.base = ioremap(c->phys_base, ONENAND_IO_SIZE);
 619         if (c->onenand.base == NULL) {
 620                 r = -ENOMEM;
 621                 goto err_release_mem_region;
 622         }
 623
 624         if (pdata->onenand_setup != NULL) {
 625                 r = pdata->onenand_setup(c->onenand.base, c->freq);
 626                 if (r < 0) {
 627                         dev_err(&pdev->dev, "Onenand platform setup failed: "
 628                                 "%d\n", r);
 629                         goto err_iounmap;
 630                 }
 631                 c->setup = pdata->onenand_setup;
 632         }
 633
 634         if (c->gpio_irq) {
 635                 if ((r = gpio_request(c->gpio_irq, "OneNAND irq")) < 0) {
 636                         dev_err(&pdev->dev,  "Failed to request GPIO%d for "
 637                                 "OneNAND\n", c->gpio_irq);
 638                         goto err_iounmap;
 639         }
 640         gpio_direction_input(c->gpio_irq);
 641
 642         if ((r = request_irq(gpio_to_irq(c->gpio_irq),
 643                              omap2_onenand_interrupt, IRQF_TRIGGER_RISING,
 644                              pdev->dev.driver->name, c)) < 0)
 645                 goto err_release_gpio;
 646         }
 647
 648         if (c->dma_channel >= 0) {
 649                 r = omap_request_dma(0, pdev->dev.driver->name,
 650                                      omap2_onenand_dma_cb, (void *) c,
 651                                      &c->dma_channel);
 652                 if (r == 0) {
 653                         omap_set_dma_write_mode(c->dma_channel,
 654                                                 OMAP_DMA_WRITE_NON_POSTED);
 655                         omap_set_dma_src_data_pack(c->dma_channel, 1);
 656                         omap_set_dma_src_burst_mode(c->dma_channel,
 657                                                     OMAP_DMA_DATA_BURST_8);
 658                         omap_set_dma_dest_data_pack(c->dma_channel, 1);
 659                         omap_set_dma_dest_burst_mode(c->dma_channel,
 660                                                      OMAP_DMA_DATA_BURST_8);
 661                 } else {
 662                         dev_info(&pdev->dev,
 663                                  "failed to allocate DMA for OneNAND, "
 664                                  "using PIO instead\n");
 665                         c->dma_channel = -1;
 666                 }
 667         }
 668
 669         dev_info(&pdev->dev, "initializing on CS%d, phys base 0x%08lx, virtual "
 670                  "base %p\n", c->gpmc_cs, c->phys_base,
 671                  c->onenand.base);
 672
 673         c->pdev = pdev;
 674         c->mtd.name = dev_name(&pdev->dev);
 675         c->mtd.priv = &c->onenand;
 676         c->mtd.owner = THIS_MODULE;
 677
 678         c->mtd.dev.parent = &pdev->dev;
 679
 680         if (c->dma_channel >= 0) {
 681                 struct onenand_chip *this = &c->onenand;
 682
 683                 this->wait = omap2_onenand_wait;
 684                 if (cpu_is_omap34xx()) {
 685                         this->read_bufferram = omap3_onenand_read_bufferram;
 686                         this->write_bufferram = omap3_onenand_write_bufferram;
 687                 } else {
 688                         this->read_bufferram = omap2_onenand_read_bufferram;
 689                         this->write_bufferram = omap2_onenand_write_bufferram;
 690                 }
 691         }
 692
 693         if ((r = onenand_scan(&c->mtd, 1)) < 0)
 694                 goto err_release_dma;
 695
 696         switch ((c->onenand.version_id >> 4) & 0xf) {
 697         case 0:
 698                 c->freq = 40;
 699                 break;
 700         case 1:
 701                 c->freq = 54;
 702                 break;
 703         case 2:
 704                 c->freq = 66;
 705                 break;
 706         case 3:
 707                 c->freq = 83;
 708                 break;
 709         }
 710
 711 #ifdef CONFIG_MTD_PARTITIONS
 712         if (pdata->parts != NULL)
 713                 r = add_mtd_partitions(&c->mtd, pdata->parts,
 714                                        pdata->nr_parts);
 715         else
 716 #endif
 717                 r = add_mtd_device(&c->mtd);
 718         if (r < 0)
 719                 goto err_release_onenand;
 720
 721         platform_set_drvdata(pdev, c);
 722
 723         return 0;
 724
 725 err_release_onenand:
 726         onenand_release(&c->mtd);
 727 err_release_dma:
 728         if (c->dma_channel != -1)
 729                 omap_free_dma(c->dma_channel);
 730         if (c->gpio_irq)
 731                 free_irq(gpio_to_irq(c->gpio_irq), c);
 732 err_release_gpio:
 733         if (c->gpio_irq)
 734                 gpio_free(c->gpio_irq);
 735 err_iounmap:
 736         iounmap(c->onenand.base);
 737 err_release_mem_region:
 738         release_mem_region(c->phys_base, ONENAND_IO_SIZE);
 739 err_free_cs:
 740         gpmc_cs_free(c->gpmc_cs);
 741 err_kfree:
 742         kfree(c);
 743
 744         return r;
 745 }
 746
 747 static int __devexit omap2_onenand_remove(struct platform_device *pdev)
 748 {
 749         struct omap2_onenand *c = dev_get_drvdata(&pdev->dev);
 750
 751         BUG_ON(c == NULL);
 752
 753 #ifdef CONFIG_MTD_PARTITIONS
 754         if (c->parts)
 755                 del_mtd_partitions(&c->mtd);
 756         else
 757                 del_mtd_device(&c->mtd);
 758 #else
 759         del_mtd_device(&c->mtd);
 760 #endif
 761
 762         onenand_release(&c->mtd);
 763         if (c->dma_channel != -1)
 764                 omap_free_dma(c->dma_channel);
 765         omap2_onenand_shutdown(pdev);
 766         platform_set_drvdata(pdev, NULL);
 767         if (c->gpio_irq) {
 768                 free_irq(gpio_to_irq(c->gpio_irq), c);
 769                 gpio_free(c->gpio_irq);
 770         }
 771         iounmap(c->onenand.base);
 772         release_mem_region(c->phys_base, ONENAND_IO_SIZE);
 773         gpmc_cs_free(c->gpmc_cs);
 774         kfree(c);
 775
 776         return 0;
 777 }
 778
 779 static struct platform_driver omap2_onenand_driver = {
 780         .probe          = omap2_onenand_probe,
 781         .remove         = __devexit_p(omap2_onenand_remove),
 782         .shutdown       = omap2_onenand_shutdown,
 783         .driver         = {
 784                 .name   = DRIVER_NAME,
 785                 .owner  = THIS_MODULE,
 786         },
 787 };
 788
 789 static int __init omap2_onenand_init(void)
 790 {
 791         printk(KERN_INFO "OneNAND driver initializing\n");
 792         return platform_driver_register(&omap2_onenand_driver);
 793 }
 794
 795 static void __exit omap2_onenand_exit(void)
 796 {
 797         platform_driver_unregister(&omap2_onenand_driver);
 798 }
 799
 800 module_init(omap2_onenand_init);
 801 module_exit(omap2_onenand_exit);
 802
 803 MODULE_ALIAS(DRIVER_NAME);
 804 MODULE_LICENSE("GPL");
 805 MODULE_AUTHOR("Jarkko Lavinen <jarkko.lavinen@nokia.com>");
 806 MODULE_DESCRIPTION("Glue layer for OneNAND flash on OMAP2 / OMAP3");