git.oblomov.eu Git - linux-2.6/blob - 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
  36 #include <asm/io.h>
  37 #include <asm/mach/flash.h>
  38 #include <asm/arch/gpmc.h>
  39 #include <asm/arch/onenand.h>
  40 #include <asm/arch/gpio.h>
  41 #include <asm/arch/pm.h>
  42
  43 #include <linux/dma-mapping.h>
  44 #include <asm/dma-mapping.h>
  45 #include <asm/arch/dma.h>
  46
  47 #include <asm/arch/board.h>
  48
  49 #define DRIVER_NAME "omap2-onenand"
  50
  51 #define ONENAND_IO_SIZE         SZ_128K
  52 #define ONENAND_BUFRAM_SIZE     (1024 * 5)
  53
  54 struct omap2_onenand {
  55         struct platform_device *pdev;
  56         int gpmc_cs;
  57         unsigned long phys_base;
  58         int gpio_irq;
  59         struct mtd_info mtd;
  60         struct mtd_partition *parts;
  61         struct onenand_chip onenand;
  62         struct completion irq_done;
  63         struct completion dma_done;
  64         int dma_channel;
  65         int freq;
  66         int (*setup)(void __iomem *base, int freq);
  67 };
  68
  69 static void omap2_onenand_dma_cb(int lch, u16 ch_status, void *data)
  70 {
  71         struct omap2_onenand *c = data;
  72
  73         complete(&c->dma_done);
  74 }
  75
  76 static irqreturn_t omap2_onenand_interrupt(int irq, void *dev_id)
  77 {
  78         struct omap2_onenand *c = dev_id;
  79
  80         complete(&c->irq_done);
  81
  82         return IRQ_HANDLED;
  83 }
  84
  85 static inline unsigned short read_reg(struct omap2_onenand *c, int reg)
  86 {
  87         return readw(c->onenand.base + reg);
  88 }
  89
  90 static inline void write_reg(struct omap2_onenand *c, unsigned short value,
  91                              int reg)
  92 {
  93         writew(value, c->onenand.base + reg);
  94 }
  95
  96 static void wait_err(char *msg, int state, unsigned int ctrl, unsigned int intr)
  97 {
  98         printk(KERN_ERR "onenand_wait: %s! state %d ctrl 0x%04x intr 0x%04x\n",
  99                msg, state, ctrl, intr);
 100 }
 101
 102 static void wait_warn(char *msg, int state, unsigned int ctrl,
 103                       unsigned int intr)
 104 {
 105         printk(KERN_WARNING "onenand_wait: %s! state %d ctrl 0x%04x "
 106                "intr 0x%04x\n", msg, state, ctrl, intr);
 107 }
 108
 109 static int omap2_onenand_wait(struct mtd_info *mtd, int state)
 110 {
 111         struct omap2_onenand *c = container_of(mtd, struct omap2_onenand, mtd);
 112         unsigned int intr = 0;
 113         unsigned int ctrl;
 114         unsigned long timeout;
 115         u32 syscfg;
 116
 117         if (state == FL_RESETING) {
 118                 int i;
 119
 120                 for (i = 0; i < 20; i++) {
 121                         udelay(1);
 122                         intr = read_reg(c, ONENAND_REG_INTERRUPT);
 123                         if (intr & ONENAND_INT_MASTER)
 124                                 break;
 125                 }
 126                 ctrl = read_reg(c, ONENAND_REG_CTRL_STATUS);
 127                 if (ctrl & ONENAND_CTRL_ERROR) {
 128                         wait_err("controller error", state, ctrl, intr);
 129                         return -EIO;
 130                 }
 131                 if (!(intr & ONENAND_INT_RESET)) {
 132                         wait_err("timeout", state, ctrl, intr);
 133                         return -EIO;
 134                 }
 135                 return 0;
 136         }
 137
 138         if (state != FL_READING) {
 139                 int result;
 140
 141                 /* Turn interrupts on */
 142                 syscfg = read_reg(c, ONENAND_REG_SYS_CFG1);
 143                 if (!(syscfg & ONENAND_SYS_CFG1_IOBE)) {
 144                         syscfg |= ONENAND_SYS_CFG1_IOBE;
 145                         write_reg(c, syscfg, ONENAND_REG_SYS_CFG1);
 146                         if (cpu_is_omap34xx())
 147                                 /* Add a delay to let GPIO settle */
 148                                 syscfg = read_reg(c, ONENAND_REG_SYS_CFG1);
 149                 }
 150
 151                 INIT_COMPLETION(c->irq_done);
 152                 if (c->gpio_irq) {
 153                         result = omap_get_gpio_datain(c->gpio_irq);
 154                         if (result == -1) {
 155                                 ctrl = read_reg(c, ONENAND_REG_CTRL_STATUS);
 156                                 intr = read_reg(c, ONENAND_REG_INTERRUPT);
 157                                 wait_err("gpio error", state, ctrl, intr);
 158                                 return -EIO;
 159                         }
 160                 } else
 161                         result = 0;
 162                 if (result == 0) {
 163                         int retry_cnt = 0;
 164 retry:
 165                         result = wait_for_completion_timeout(&c->irq_done,
 166                                                     msecs_to_jiffies(20));
 167                         if (result == 0) {
 168                                 /* Timeout after 20ms */
 169                                 ctrl = read_reg(c, ONENAND_REG_CTRL_STATUS);
 170                                 if (ctrl & ONENAND_CTRL_ONGO) {
 171                                         /*
 172                                          * The operation seems to be still going
 173                                          * so give it some more time.
 174                                          */
 175                                         retry_cnt += 1;
 176                                         if (retry_cnt < 3)
 177                                                 goto retry;
 178                                         intr = read_reg(c,
 179                                                         ONENAND_REG_INTERRUPT);
 180                                         wait_err("timeout", state, ctrl, intr);
 181                                         return -EIO;
 182                                 }
 183                                 intr = read_reg(c, ONENAND_REG_INTERRUPT);
 184                                 if ((intr & ONENAND_INT_MASTER) == 0)
 185                                         wait_warn("timeout", state, ctrl, intr);
 186                         }
 187                 }
 188         } else {
 189                 int retry_cnt = 0;
 190
 191                 /* Turn interrupts off */
 192                 syscfg = read_reg(c, ONENAND_REG_SYS_CFG1);
 193                 syscfg &= ~ONENAND_SYS_CFG1_IOBE;
 194                 write_reg(c, syscfg, ONENAND_REG_SYS_CFG1);
 195
 196                 timeout = jiffies + msecs_to_jiffies(20);
 197                 while (1) {
 198                         if (time_before(jiffies, timeout)) {
 199                                 intr = read_reg(c, ONENAND_REG_INTERRUPT);
 200                                 if (intr & ONENAND_INT_MASTER)
 201                                         break;
 202                         } else {
 203                                 /* Timeout after 20ms */
 204                                 ctrl = read_reg(c, ONENAND_REG_CTRL_STATUS);
 205                                 if (ctrl & ONENAND_CTRL_ONGO) {
 206                                         /*
 207                                          * The operation seems to be still going
 208                                          * so give it some more time.
 209                                          */
 210                                         retry_cnt += 1;
 211                                         if (retry_cnt < 3) {
 212                                                 timeout = jiffies +
 213                                                           msecs_to_jiffies(20);
 214                                                 continue;
 215                                         }
 216                                 }
 217                                 break;
 218                         }
 219                 }
 220         }
 221
 222         intr = read_reg(c, ONENAND_REG_INTERRUPT);
 223         ctrl = read_reg(c, ONENAND_REG_CTRL_STATUS);
 224
 225         if (intr & ONENAND_INT_READ) {
 226                 int ecc = read_reg(c, ONENAND_REG_ECC_STATUS);
 227
 228                 if (ecc) {
 229                         unsigned int addr1, addr8;
 230
 231                         addr1 = read_reg(c, ONENAND_REG_START_ADDRESS1);
 232                         addr8 = read_reg(c, ONENAND_REG_START_ADDRESS8);
 233                         if (ecc & ONENAND_ECC_2BIT_ALL) {
 234                                 printk(KERN_ERR "onenand_wait: ECC error = "
 235                                        "0x%04x, addr1 %#x, addr8 %#x\n",
 236                                        ecc, addr1, addr8);
 237                                 mtd->ecc_stats.failed++;
 238                                 return -EBADMSG;
 239                         } else if (ecc & ONENAND_ECC_1BIT_ALL) {
 240                                 printk(KERN_NOTICE "onenand_wait: correctable "
 241                                        "ECC error = 0x%04x, addr1 %#x, "
 242                                        "addr8 %#x\n", ecc, addr1, addr8);
 243                                 mtd->ecc_stats.corrected++;
 244                         }
 245                 }
 246         } else if (state == FL_READING) {
 247                 wait_err("timeout", state, ctrl, intr);
 248                 return -EIO;
 249         }
 250
 251         if (ctrl & ONENAND_CTRL_ERROR) {
 252                 wait_err("controller error", state, ctrl, intr);
 253                 if (ctrl & ONENAND_CTRL_LOCK)
 254                         printk(KERN_ERR "onenand_wait: "
 255                                         "Device is write protected!!!\n");
 256                 return -EIO;
 257         }
 258
 259         if (ctrl & 0xFE9F)
 260                 wait_warn("unexpected controller status", state, ctrl, intr);
 261
 262         return 0;
 263 }
 264
 265 static inline int omap2_onenand_bufferram_offset(struct mtd_info *mtd, int area)
 266 {
 267         struct onenand_chip *this = mtd->priv;
 268
 269         if (ONENAND_CURRENT_BUFFERRAM(this)) {
 270                 if (area == ONENAND_DATARAM)
 271                         return mtd->writesize;
 272                 if (area == ONENAND_SPARERAM)
 273                         return mtd->oobsize;
 274         }
 275
 276         return 0;
 277 }
 278
 279 #if defined(CONFIG_ARCH_OMAP3) || defined(MULTI_OMAP2)
 280
 281 static int omap3_onenand_read_bufferram(struct mtd_info *mtd, int area,
 282                                         unsigned char *buffer, int offset,
 283                                         size_t count)
 284 {
 285         struct omap2_onenand *c = container_of(mtd, struct omap2_onenand, mtd);
 286         struct onenand_chip *this = mtd->priv;
 287         dma_addr_t dma_src, dma_dst;
 288         int bram_offset;
 289         unsigned long timeout;
 290         void *buf = (void *)buffer;
 291         size_t xtra;
 292         volatile unsigned *done;
 293
 294         bram_offset = omap2_onenand_bufferram_offset(mtd, area) + area + offset;
 295         if (bram_offset & 3 || (size_t)buf & 3 || count < 384)
 296                 goto out_copy;
 297
 298         if (buf >= high_memory) {
 299                 struct page *p1;
 300
 301                 if (((size_t)buf & PAGE_MASK) !=
 302                     ((size_t)(buf + count - 1) & PAGE_MASK))
 303                         goto out_copy;
 304                 p1 = vmalloc_to_page(buf);
 305                 if (!p1)
 306                         goto out_copy;
 307                 buf = page_address(p1) + ((size_t)buf & ~PAGE_MASK);
 308         }
 309
 310         xtra = count & 3;
 311         if (xtra) {
 312                 count -= xtra;
 313                 memcpy(buf + count, this->base + bram_offset + count, xtra);
 314         }
 315
 316         dma_src = c->phys_base + bram_offset;
 317         dma_dst = dma_map_single(&c->pdev->dev, buf, count, DMA_FROM_DEVICE);
 318         if (dma_mapping_error(&c->pdev->dev, dma_dst)) {
 319                 dev_err(&c->pdev->dev,
 320                         "Couldn't DMA map a %d byte buffer\n",
 321                         count);
 322                 goto out_copy;
 323         }
 324
 325         omap_set_dma_transfer_params(c->dma_channel, OMAP_DMA_DATA_TYPE_S32,
 326                                      count >> 2, 1, 0, 0, 0);
 327         omap_set_dma_src_params(c->dma_channel, 0, OMAP_DMA_AMODE_POST_INC,
 328                                 dma_src, 0, 0);
 329         omap_set_dma_dest_params(c->dma_channel, 0, OMAP_DMA_AMODE_POST_INC,
 330                                  dma_dst, 0, 0);
 331
 332         INIT_COMPLETION(c->dma_done);
 333         omap_start_dma(c->dma_channel);
 334
 335         timeout = jiffies + msecs_to_jiffies(20);
 336         done = &c->dma_done.done;
 337         while (time_before(jiffies, timeout))
 338                 if (*done)
 339                         break;
 340
 341         dma_unmap_single(&c->pdev->dev, dma_dst, count, DMA_FROM_DEVICE);
 342
 343         if (!*done) {
 344                 dev_err(&c->pdev->dev, "timeout waiting for DMA\n");
 345                 goto out_copy;
 346         }
 347
 348         return 0;
 349
 350 out_copy:
 351         memcpy(buf, this->base + bram_offset, count);
 352         return 0;
 353 }
 354
 355 static int omap3_onenand_write_bufferram(struct mtd_info *mtd, int area,
 356                                          const unsigned char *buffer,
 357                                          int offset, size_t count)
 358 {
 359         struct omap2_onenand *c = container_of(mtd, struct omap2_onenand, mtd);
 360         struct onenand_chip *this = mtd->priv;
 361         dma_addr_t dma_src, dma_dst;
 362         int bram_offset;
 363         unsigned long timeout;
 364         void *buf = (void *)buffer;
 365         volatile unsigned *done;
 366
 367         bram_offset = omap2_onenand_bufferram_offset(mtd, area) + area + offset;
 368         if (bram_offset & 3 || (size_t)buf & 3 || count < 384)
 369                 goto out_copy;
 370
 371         /* panic_write() may be in an interrupt context */
 372         if (in_interrupt())
 373                 goto out_copy;
 374
 375         if (buf >= high_memory) {
 376                 struct page *p1;
 377
 378                 if (((size_t)buf & PAGE_MASK) !=
 379                     ((size_t)(buf + count - 1) & PAGE_MASK))
 380                         goto out_copy;
 381                 p1 = vmalloc_to_page(buf);
 382                 if (!p1)
 383                         goto out_copy;
 384                 buf = page_address(p1) + ((size_t)buf & ~PAGE_MASK);
 385         }
 386
 387         dma_src = dma_map_single(&c->pdev->dev, buf, count, DMA_TO_DEVICE);
 388         dma_dst = c->phys_base + bram_offset;
 389         if (dma_mapping_error(&c->pdev->dev, dma_dst)) {
 390                 dev_err(&c->pdev->dev,
 391                         "Couldn't DMA map a %d byte buffer\n",
 392                         count);
 393                 return -1;
 394         }
 395
 396         omap_set_dma_transfer_params(c->dma_channel, OMAP_DMA_DATA_TYPE_S32,
 397                                      count >> 2, 1, 0, 0, 0);
 398         omap_set_dma_src_params(c->dma_channel, 0, OMAP_DMA_AMODE_POST_INC,
 399                                 dma_src, 0, 0);
 400         omap_set_dma_dest_params(c->dma_channel, 0, OMAP_DMA_AMODE_POST_INC,
 401                                  dma_dst, 0, 0);
 402
 403         INIT_COMPLETION(c->dma_done);
 404         omap_start_dma(c->dma_channel);
 405
 406         timeout = jiffies + msecs_to_jiffies(20);
 407         done = &c->dma_done.done;
 408         while (time_before(jiffies, timeout))
 409                 if (*done)
 410                         break;
 411
 412         dma_unmap_single(&c->pdev->dev, dma_dst, count, DMA_TO_DEVICE);
 413
 414         if (!*done) {
 415                 dev_err(&c->pdev->dev, "timeout waiting for DMA\n");
 416                 goto out_copy;
 417         }
 418
 419         return 0;
 420
 421 out_copy:
 422         memcpy(this->base + bram_offset, buf, count);
 423         return 0;
 424 }
 425
 426 #else
 427
 428 int omap3_onenand_read_bufferram(struct mtd_info *mtd, int area,
 429                                  unsigned char *buffer, int offset,
 430                                  size_t count);
 431
 432 int omap3_onenand_write_bufferram(struct mtd_info *mtd, int area,
 433                                   const unsigned char *buffer,
 434                                   int offset, size_t count);
 435
 436 #endif
 437
 438 #if defined(CONFIG_ARCH_OMAP2) || defined(MULTI_OMAP2)
 439
 440 static int omap2_onenand_read_bufferram(struct mtd_info *mtd, int area,
 441                                         unsigned char *buffer, int offset,
 442                                         size_t count)
 443 {
 444         struct omap2_onenand *c = container_of(mtd, struct omap2_onenand, mtd);
 445         struct onenand_chip *this = mtd->priv;
 446         dma_addr_t dma_src, dma_dst;
 447         int bram_offset;
 448
 449         bram_offset = omap2_onenand_bufferram_offset(mtd, area) + area + offset;
 450         /* DMA is not used.  Revisit PM requirements before enabling it. */
 451         if (1 || (c->dma_channel < 0) ||
 452             ((void *) buffer >= (void *) high_memory) || (bram_offset & 3) ||
 453             (((unsigned int) buffer) & 3) || (count < 1024) || (count & 3)) {
 454                 memcpy(buffer, (__force void *)(this->base + bram_offset),
 455                        count);
 456                 return 0;
 457         }
 458
 459         dma_src = c->phys_base + bram_offset;
 460         dma_dst = dma_map_single(&c->pdev->dev, buffer, count,
 461                                  DMA_FROM_DEVICE);
 462         if (dma_mapping_error(&c->pdev->dev, dma_dst)) {
 463                 dev_err(&c->pdev->dev,
 464                         "Couldn't DMA map a %d byte buffer\n",
 465                         count);
 466                 return -1;
 467         }
 468
 469         omap_set_dma_transfer_params(c->dma_channel, OMAP_DMA_DATA_TYPE_S32,
 470                                      count / 4, 1, 0, 0, 0);
 471         omap_set_dma_src_params(c->dma_channel, 0, OMAP_DMA_AMODE_POST_INC,
 472                                 dma_src, 0, 0);
 473         omap_set_dma_dest_params(c->dma_channel, 0, OMAP_DMA_AMODE_POST_INC,
 474                                  dma_dst, 0, 0);
 475
 476         INIT_COMPLETION(c->dma_done);
 477         omap_start_dma(c->dma_channel);
 478         wait_for_completion(&c->dma_done);
 479
 480         dma_unmap_single(&c->pdev->dev, dma_dst, count, DMA_FROM_DEVICE);
 481
 482         return 0;
 483 }
 484
 485 static int omap2_onenand_write_bufferram(struct mtd_info *mtd, int area,
 486                                          const unsigned char *buffer,
 487                                          int offset, size_t count)
 488 {
 489         struct omap2_onenand *c = container_of(mtd, struct omap2_onenand, mtd);
 490         struct onenand_chip *this = mtd->priv;
 491         dma_addr_t dma_src, dma_dst;
 492         int bram_offset;
 493
 494         bram_offset = omap2_onenand_bufferram_offset(mtd, area) + area + offset;
 495         /* DMA is not used.  Revisit PM requirements before enabling it. */
 496         if (1 || (c->dma_channel < 0) ||
 497             ((void *) buffer >= (void *) high_memory) || (bram_offset & 3) ||
 498             (((unsigned int) buffer) & 3) || (count < 1024) || (count & 3)) {
 499                 memcpy((__force void *)(this->base + bram_offset), buffer,
 500                        count);
 501                 return 0;
 502         }
 503
 504         dma_src = dma_map_single(&c->pdev->dev, (void *) buffer, count,
 505                                  DMA_TO_DEVICE);
 506         dma_dst = c->phys_base + bram_offset;
 507         if (dma_mapping_error(&c->pdev->dev, dma_dst)) {
 508                 dev_err(&c->pdev->dev,
 509                         "Couldn't DMA map a %d byte buffer\n",
 510                         count);
 511                 return -1;
 512         }
 513
 514         omap_set_dma_transfer_params(c->dma_channel, OMAP_DMA_DATA_TYPE_S16,
 515                                      count / 2, 1, 0, 0, 0);
 516         omap_set_dma_src_params(c->dma_channel, 0, OMAP_DMA_AMODE_POST_INC,
 517                                 dma_src, 0, 0);
 518         omap_set_dma_dest_params(c->dma_channel, 0, OMAP_DMA_AMODE_POST_INC,
 519                                  dma_dst, 0, 0);
 520
 521         INIT_COMPLETION(c->dma_done);
 522         omap_start_dma(c->dma_channel);
 523         wait_for_completion(&c->dma_done);
 524
 525         dma_unmap_single(&c->pdev->dev, dma_dst, count, DMA_TO_DEVICE);
 526
 527         return 0;
 528 }
 529
 530 #else
 531
 532 int omap2_onenand_read_bufferram(struct mtd_info *mtd, int area,
 533                                  unsigned char *buffer, int offset,
 534                                  size_t count);
 535
 536 int omap2_onenand_write_bufferram(struct mtd_info *mtd, int area,
 537                                   const unsigned char *buffer,
 538                                   int offset, size_t count);
 539
 540 #endif
 541
 542 static struct platform_driver omap2_onenand_driver;
 543
 544 static int __adjust_timing(struct device *dev, void *data)
 545 {
 546         int ret = 0;
 547         struct omap2_onenand *c;
 548
 549         c = dev_get_drvdata(dev);
 550
 551         BUG_ON(c->setup == NULL);
 552
 553         /* DMA is not in use so this is all that is needed */
 554         /* Revisit for OMAP3! */
 555         ret = c->setup(c->onenand.base, c->freq);
 556
 557         return ret;
 558 }
 559
 560 int omap2_onenand_rephase(void)
 561 {
 562         return driver_for_each_device(&omap2_onenand_driver.driver, NULL,
 563                                       NULL, __adjust_timing);
 564 }
 565
 566 static void __devexit omap2_onenand_shutdown(struct platform_device *pdev)
 567 {
 568         struct omap2_onenand *c = dev_get_drvdata(&pdev->dev);
 569
 570         /* With certain content in the buffer RAM, the OMAP boot ROM code
 571          * can recognize the flash chip incorrectly. Zero it out before
 572          * soft reset.
 573          */
 574         memset((__force void *)c->onenand.base, 0, ONENAND_BUFRAM_SIZE);
 575 }
 576
 577 static int __devinit omap2_onenand_probe(struct platform_device *pdev)
 578 {
 579         struct omap_onenand_platform_data *pdata;
 580         struct omap2_onenand *c;
 581         int r;
 582
 583         pdata = pdev->dev.platform_data;
 584         if (pdata == NULL) {
 585                 dev_err(&pdev->dev, "platform data missing\n");
 586                 return -ENODEV;
 587         }
 588
 589         c = kzalloc(sizeof(struct omap2_onenand), GFP_KERNEL);
 590         if (!c)
 591                 return -ENOMEM;
 592
 593         init_completion(&c->irq_done);
 594         init_completion(&c->dma_done);
 595         c->gpmc_cs = pdata->cs;
 596         c->gpio_irq = pdata->gpio_irq;
 597         c->dma_channel = pdata->dma_channel;
 598         if (c->dma_channel < 0) {
 599                 /* if -1, don't use DMA */
 600                 c->gpio_irq = 0;
 601         }
 602
 603         r = gpmc_cs_request(c->gpmc_cs, ONENAND_IO_SIZE, &c->phys_base);
 604         if (r < 0) {
 605                 dev_err(&pdev->dev, "Cannot request GPMC CS\n");
 606                 goto err_kfree;
 607         }
 608
 609         if (request_mem_region(c->phys_base, ONENAND_IO_SIZE,
 610                                pdev->dev.driver->name) == NULL) {
 611                 dev_err(&pdev->dev, "Cannot reserve memory region at 0x%08lx, "
 612                         "size: 0x%x\n", c->phys_base, ONENAND_IO_SIZE);
 613                 r = -EBUSY;
 614                 goto err_free_cs;
 615         }
 616         c->onenand.base = ioremap(c->phys_base, ONENAND_IO_SIZE);
 617         if (c->onenand.base == NULL) {
 618                 r = -ENOMEM;
 619                 goto err_release_mem_region;
 620         }
 621
 622         if (pdata->onenand_setup != NULL) {
 623                 r = pdata->onenand_setup(c->onenand.base, c->freq);
 624                 if (r < 0) {
 625                         dev_err(&pdev->dev, "Onenand platform setup failed: "
 626                                 "%d\n", r);
 627                         goto err_iounmap;
 628                 }
 629                 c->setup = pdata->onenand_setup;
 630         }
 631
 632         if (c->gpio_irq) {
 633                 if ((r = omap_request_gpio(c->gpio_irq)) < 0) {
 634                         dev_err(&pdev->dev,  "Failed to request GPIO%d for "
 635                                 "OneNAND\n", c->gpio_irq);
 636                         goto err_iounmap;
 637         }
 638         omap_set_gpio_direction(c->gpio_irq, 1);
 639
 640         if ((r = request_irq(OMAP_GPIO_IRQ(c->gpio_irq),
 641                              omap2_onenand_interrupt, IRQF_TRIGGER_RISING,
 642                              pdev->dev.driver->name, c)) < 0)
 643                 goto err_release_gpio;
 644         }
 645
 646         if (c->dma_channel >= 0) {
 647                 r = omap_request_dma(0, pdev->dev.driver->name,
 648                                      omap2_onenand_dma_cb, (void *) c,
 649                                      &c->dma_channel);
 650                 if (r == 0) {
 651                         omap_set_dma_write_mode(c->dma_channel,
 652                                                 OMAP_DMA_WRITE_NON_POSTED);
 653                         omap_set_dma_src_data_pack(c->dma_channel, 1);
 654                         omap_set_dma_src_burst_mode(c->dma_channel,
 655                                                     OMAP_DMA_DATA_BURST_8);
 656                         omap_set_dma_dest_data_pack(c->dma_channel, 1);
 657                         omap_set_dma_dest_burst_mode(c->dma_channel,
 658                                                      OMAP_DMA_DATA_BURST_8);
 659                 } else {
 660                         dev_info(&pdev->dev,
 661                                  "failed to allocate DMA for OneNAND, "
 662                                  "using PIO instead\n");
 663                         c->dma_channel = -1;
 664                 }
 665         }
 666
 667         dev_info(&pdev->dev, "initializing on CS%d, phys base 0x%08lx, virtual "
 668                  "base %p\n", c->gpmc_cs, c->phys_base,
 669                  c->onenand.base);
 670
 671         c->pdev = pdev;
 672         c->mtd.name = pdev->dev.bus_id;
 673         c->mtd.priv = &c->onenand;
 674         c->mtd.owner = THIS_MODULE;
 675
 676         if (c->dma_channel >= 0) {
 677                 struct onenand_chip *this = &c->onenand;
 678
 679                 this->wait = omap2_onenand_wait;
 680                 if (cpu_is_omap34xx()) {
 681                         this->read_bufferram = omap3_onenand_read_bufferram;
 682                         this->write_bufferram = omap3_onenand_write_bufferram;
 683                 } else {
 684                         this->read_bufferram = omap2_onenand_read_bufferram;
 685                         this->write_bufferram = omap2_onenand_write_bufferram;
 686                 }
 687         }
 688
 689         if ((r = onenand_scan(&c->mtd, 1)) < 0)
 690                 goto err_release_dma;
 691
 692         switch ((c->onenand.version_id >> 4) & 0xf) {
 693         case 0:
 694                 c->freq = 40;
 695                 break;
 696         case 1:
 697                 c->freq = 54;
 698                 break;
 699         case 2:
 700                 c->freq = 66;
 701                 break;
 702         case 3:
 703                 c->freq = 83;
 704                 break;
 705         }
 706
 707 #ifdef CONFIG_MTD_PARTITIONS
 708         if (pdata->parts != NULL)
 709                 r = add_mtd_partitions(&c->mtd, pdata->parts,
 710                                        pdata->nr_parts);
 711         else
 712 #endif
 713                 r = add_mtd_device(&c->mtd);
 714         if (r < 0)
 715                 goto err_release_onenand;
 716
 717         platform_set_drvdata(pdev, c);
 718
 719         return 0;
 720
 721 err_release_onenand:
 722         onenand_release(&c->mtd);
 723 err_release_dma:
 724         if (c->dma_channel != -1)
 725                 omap_free_dma(c->dma_channel);
 726         if (c->gpio_irq)
 727                 free_irq(OMAP_GPIO_IRQ(c->gpio_irq), c);
 728 err_release_gpio:
 729         if (c->gpio_irq)
 730                 omap_free_gpio(c->gpio_irq);
 731 err_iounmap:
 732         iounmap(c->onenand.base);
 733 err_release_mem_region:
 734         release_mem_region(c->phys_base, ONENAND_IO_SIZE);
 735 err_free_cs:
 736         gpmc_cs_free(c->gpmc_cs);
 737 err_kfree:
 738         kfree(c);
 739
 740         return r;
 741 }
 742
 743 static int __devexit omap2_onenand_remove(struct platform_device *pdev)
 744 {
 745         struct omap2_onenand *c = dev_get_drvdata(&pdev->dev);
 746
 747         BUG_ON(c == NULL);
 748
 749 #ifdef CONFIG_MTD_PARTITIONS
 750         if (c->parts)
 751                 del_mtd_partitions(&c->mtd);
 752         else
 753                 del_mtd_device(&c->mtd);
 754 #else
 755         del_mtd_device(&c->mtd);
 756 #endif
 757
 758         onenand_release(&c->mtd);
 759         if (c->dma_channel != -1)
 760                 omap_free_dma(c->dma_channel);
 761         omap2_onenand_shutdown(pdev);
 762         platform_set_drvdata(pdev, NULL);
 763         if (c->gpio_irq) {
 764                 free_irq(OMAP_GPIO_IRQ(c->gpio_irq), c);
 765                 omap_free_gpio(c->gpio_irq);
 766         }
 767         iounmap(c->onenand.base);
 768         release_mem_region(c->phys_base, ONENAND_IO_SIZE);
 769         kfree(c);
 770
 771         return 0;
 772 }
 773
 774 static struct platform_driver omap2_onenand_driver = {
 775         .probe          = omap2_onenand_probe,
 776         .remove         = omap2_onenand_remove,
 777         .shutdown       = omap2_onenand_shutdown,
 778         .driver         = {
 779                 .name   = DRIVER_NAME,
 780                 .owner  = THIS_MODULE,
 781         },
 782 };
 783
 784 static int __init omap2_onenand_init(void)
 785 {
 786         printk(KERN_INFO "OneNAND driver initializing\n");
 787         return platform_driver_register(&omap2_onenand_driver);
 788 }
 789
 790 static void __exit omap2_onenand_exit(void)
 791 {
 792         platform_driver_unregister(&omap2_onenand_driver);
 793 }
 794
 795 module_init(omap2_onenand_init);
 796 module_exit(omap2_onenand_exit);
 797
 798 MODULE_ALIAS(DRIVER_NAME);
 799 MODULE_LICENSE("GPL");
 800 MODULE_AUTHOR("Jarkko Lavinen <jarkko.lavinen@nokia.com>");
 801 MODULE_DESCRIPTION("Glue layer for OneNAND flash on OMAP2 / OMAP3");