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 <plat/gpmc.h>
  40 #include <plat/onenand.h>
  41 #include <mach/gpio.h>
  42
  43 #include <plat/dma.h>
  44
  45 #include <plat/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 || state == FL_PREPARING_ERASE ||
 116             state == FL_VERIFYING_ERASE) {
 117                 int i = 21;
 118                 unsigned int intr_flags = ONENAND_INT_MASTER;
 119
 120                 switch (state) {
 121                 case FL_RESETING:
 122                         intr_flags |= ONENAND_INT_RESET;
 123                         break;
 124                 case FL_PREPARING_ERASE:
 125                         intr_flags |= ONENAND_INT_ERASE;
 126                         break;
 127                 case FL_VERIFYING_ERASE:
 128                         i = 101;
 129                         break;
 130                 }
 131
 132                 while (--i) {
 133                         udelay(1);
 134                         intr = read_reg(c, ONENAND_REG_INTERRUPT);
 135                         if (intr & ONENAND_INT_MASTER)
 136                                 break;
 137                 }
 138                 ctrl = read_reg(c, ONENAND_REG_CTRL_STATUS);
 139                 if (ctrl & ONENAND_CTRL_ERROR) {
 140                         wait_err("controller error", state, ctrl, intr);
 141                         return -EIO;
 142                 }
 143                 if ((intr & intr_flags) != intr_flags) {
 144                         wait_err("timeout", state, ctrl, intr);
 145                         return -EIO;
 146                 }
 147                 return 0;
 148         }
 149
 150         if (state != FL_READING) {
 151                 int result;
 152
 153                 /* Turn interrupts on */
 154                 syscfg = read_reg(c, ONENAND_REG_SYS_CFG1);
 155                 if (!(syscfg & ONENAND_SYS_CFG1_IOBE)) {
 156                         syscfg |= ONENAND_SYS_CFG1_IOBE;
 157                         write_reg(c, syscfg, ONENAND_REG_SYS_CFG1);
 158                         if (cpu_is_omap34xx())
 159                                 /* Add a delay to let GPIO settle */
 160                                 syscfg = read_reg(c, ONENAND_REG_SYS_CFG1);
 161                 }
 162
 163                 INIT_COMPLETION(c->irq_done);
 164                 if (c->gpio_irq) {
 165                         result = gpio_get_value(c->gpio_irq);
 166                         if (result == -1) {
 167                                 ctrl = read_reg(c, ONENAND_REG_CTRL_STATUS);
 168                                 intr = read_reg(c, ONENAND_REG_INTERRUPT);
 169                                 wait_err("gpio error", state, ctrl, intr);
 170                                 return -EIO;
 171                         }
 172                 } else
 173                         result = 0;
 174                 if (result == 0) {
 175                         int retry_cnt = 0;
 176 retry:
 177                         result = wait_for_completion_timeout(&c->irq_done,
 178                                                     msecs_to_jiffies(20));
 179                         if (result == 0) {
 180                                 /* Timeout after 20ms */
 181                                 ctrl = read_reg(c, ONENAND_REG_CTRL_STATUS);
 182                                 if (ctrl & ONENAND_CTRL_ONGO) {
 183                                         /*
 184                                          * The operation seems to be still going
 185                                          * so give it some more time.
 186                                          */
 187                                         retry_cnt += 1;
 188                                         if (retry_cnt < 3)
 189                                                 goto retry;
 190                                         intr = read_reg(c,
 191                                                         ONENAND_REG_INTERRUPT);
 192                                         wait_err("timeout", state, ctrl, intr);
 193                                         return -EIO;
 194                                 }
 195                                 intr = read_reg(c, ONENAND_REG_INTERRUPT);
 196                                 if ((intr & ONENAND_INT_MASTER) == 0)
 197                                         wait_warn("timeout", state, ctrl, intr);
 198                         }
 199                 }
 200         } else {
 201                 int retry_cnt = 0;
 202
 203                 /* Turn interrupts off */
 204                 syscfg = read_reg(c, ONENAND_REG_SYS_CFG1);
 205                 syscfg &= ~ONENAND_SYS_CFG1_IOBE;
 206                 write_reg(c, syscfg, ONENAND_REG_SYS_CFG1);
 207
 208                 timeout = jiffies + msecs_to_jiffies(20);
 209                 while (1) {
 210                         if (time_before(jiffies, timeout)) {
 211                                 intr = read_reg(c, ONENAND_REG_INTERRUPT);
 212                                 if (intr & ONENAND_INT_MASTER)
 213                                         break;
 214                         } else {
 215                                 /* Timeout after 20ms */
 216                                 ctrl = read_reg(c, ONENAND_REG_CTRL_STATUS);
 217                                 if (ctrl & ONENAND_CTRL_ONGO) {
 218                                         /*
 219                                          * The operation seems to be still going
 220                                          * so give it some more time.
 221                                          */
 222                                         retry_cnt += 1;
 223                                         if (retry_cnt < 3) {
 224                                                 timeout = jiffies +
 225                                                           msecs_to_jiffies(20);
 226                                                 continue;
 227                                         }
 228                                 }
 229                                 break;
 230                         }
 231                 }
 232         }
 233
 234         intr = read_reg(c, ONENAND_REG_INTERRUPT);
 235         ctrl = read_reg(c, ONENAND_REG_CTRL_STATUS);
 236
 237         if (intr & ONENAND_INT_READ) {
 238                 int ecc = read_reg(c, ONENAND_REG_ECC_STATUS);
 239
 240                 if (ecc) {
 241                         unsigned int addr1, addr8;
 242
 243                         addr1 = read_reg(c, ONENAND_REG_START_ADDRESS1);
 244                         addr8 = read_reg(c, ONENAND_REG_START_ADDRESS8);
 245                         if (ecc & ONENAND_ECC_2BIT_ALL) {
 246                                 printk(KERN_ERR "onenand_wait: ECC error = "
 247                                        "0x%04x, addr1 %#x, addr8 %#x\n",
 248                                        ecc, addr1, addr8);
 249                                 mtd->ecc_stats.failed++;
 250                                 return -EBADMSG;
 251                         } else if (ecc & ONENAND_ECC_1BIT_ALL) {
 252                                 printk(KERN_NOTICE "onenand_wait: correctable "
 253                                        "ECC error = 0x%04x, addr1 %#x, "
 254                                        "addr8 %#x\n", ecc, addr1, addr8);
 255                                 mtd->ecc_stats.corrected++;
 256                         }
 257                 }
 258         } else if (state == FL_READING) {
 259                 wait_err("timeout", state, ctrl, intr);
 260                 return -EIO;
 261         }
 262
 263         if (ctrl & ONENAND_CTRL_ERROR) {
 264                 wait_err("controller error", state, ctrl, intr);
 265                 if (ctrl & ONENAND_CTRL_LOCK)
 266                         printk(KERN_ERR "onenand_wait: "
 267                                         "Device is write protected!!!\n");
 268                 return -EIO;
 269         }
 270
 271         if (ctrl & 0xFE9F)
 272                 wait_warn("unexpected controller status", state, ctrl, intr);
 273
 274         return 0;
 275 }
 276
 277 static inline int omap2_onenand_bufferram_offset(struct mtd_info *mtd, int area)
 278 {
 279         struct onenand_chip *this = mtd->priv;
 280
 281         if (ONENAND_CURRENT_BUFFERRAM(this)) {
 282                 if (area == ONENAND_DATARAM)
 283                         return this->writesize;
 284                 if (area == ONENAND_SPARERAM)
 285                         return mtd->oobsize;
 286         }
 287
 288         return 0;
 289 }
 290
 291 #if defined(CONFIG_ARCH_OMAP3) || defined(MULTI_OMAP2)
 292
 293 static int omap3_onenand_read_bufferram(struct mtd_info *mtd, int area,
 294                                         unsigned char *buffer, int offset,
 295                                         size_t count)
 296 {
 297         struct omap2_onenand *c = container_of(mtd, struct omap2_onenand, mtd);
 298         struct onenand_chip *this = mtd->priv;
 299         dma_addr_t dma_src, dma_dst;
 300         int bram_offset;
 301         unsigned long timeout;
 302         void *buf = (void *)buffer;
 303         size_t xtra;
 304         volatile unsigned *done;
 305
 306         bram_offset = omap2_onenand_bufferram_offset(mtd, area) + area + offset;
 307         if (bram_offset & 3 || (size_t)buf & 3 || count < 384)
 308                 goto out_copy;
 309
 310         /* panic_write() may be in an interrupt context */
 311         if (in_interrupt())
 312                 goto out_copy;
 313
 314         if (buf >= high_memory) {
 315                 struct page *p1;
 316
 317                 if (((size_t)buf & PAGE_MASK) !=
 318                     ((size_t)(buf + count - 1) & PAGE_MASK))
 319                         goto out_copy;
 320                 p1 = vmalloc_to_page(buf);
 321                 if (!p1)
 322                         goto out_copy;
 323                 buf = page_address(p1) + ((size_t)buf & ~PAGE_MASK);
 324         }
 325
 326         xtra = count & 3;
 327         if (xtra) {
 328                 count -= xtra;
 329                 memcpy(buf + count, this->base + bram_offset + count, xtra);
 330         }
 331
 332         dma_src = c->phys_base + bram_offset;
 333         dma_dst = dma_map_single(&c->pdev->dev, buf, count, DMA_FROM_DEVICE);
 334         if (dma_mapping_error(&c->pdev->dev, dma_dst)) {
 335                 dev_err(&c->pdev->dev,
 336                         "Couldn't DMA map a %d byte buffer\n",
 337                         count);
 338                 goto out_copy;
 339         }
 340
 341         omap_set_dma_transfer_params(c->dma_channel, OMAP_DMA_DATA_TYPE_S32,
 342                                      count >> 2, 1, 0, 0, 0);
 343         omap_set_dma_src_params(c->dma_channel, 0, OMAP_DMA_AMODE_POST_INC,
 344                                 dma_src, 0, 0);
 345         omap_set_dma_dest_params(c->dma_channel, 0, OMAP_DMA_AMODE_POST_INC,
 346                                  dma_dst, 0, 0);
 347
 348         INIT_COMPLETION(c->dma_done);
 349         omap_start_dma(c->dma_channel);
 350
 351         timeout = jiffies + msecs_to_jiffies(20);
 352         done = &c->dma_done.done;
 353         while (time_before(jiffies, timeout))
 354                 if (*done)
 355                         break;
 356
 357         dma_unmap_single(&c->pdev->dev, dma_dst, count, DMA_FROM_DEVICE);
 358
 359         if (!*done) {
 360                 dev_err(&c->pdev->dev, "timeout waiting for DMA\n");
 361                 goto out_copy;
 362         }
 363
 364         return 0;
 365
 366 out_copy:
 367         memcpy(buf, this->base + bram_offset, count);
 368         return 0;
 369 }
 370
 371 static int omap3_onenand_write_bufferram(struct mtd_info *mtd, int area,
 372                                          const unsigned char *buffer,
 373                                          int offset, size_t count)
 374 {
 375         struct omap2_onenand *c = container_of(mtd, struct omap2_onenand, mtd);
 376         struct onenand_chip *this = mtd->priv;
 377         dma_addr_t dma_src, dma_dst;
 378         int bram_offset;
 379         unsigned long timeout;
 380         void *buf = (void *)buffer;
 381         volatile unsigned *done;
 382
 383         bram_offset = omap2_onenand_bufferram_offset(mtd, area) + area + offset;
 384         if (bram_offset & 3 || (size_t)buf & 3 || count < 384)
 385                 goto out_copy;
 386
 387         /* panic_write() may be in an interrupt context */
 388         if (in_interrupt())
 389                 goto out_copy;
 390
 391         if (buf >= high_memory) {
 392                 struct page *p1;
 393
 394                 if (((size_t)buf & PAGE_MASK) !=
 395                     ((size_t)(buf + count - 1) & PAGE_MASK))
 396                         goto out_copy;
 397                 p1 = vmalloc_to_page(buf);
 398                 if (!p1)
 399                         goto out_copy;
 400                 buf = page_address(p1) + ((size_t)buf & ~PAGE_MASK);
 401         }
 402
 403         dma_src = dma_map_single(&c->pdev->dev, buf, count, DMA_TO_DEVICE);
 404         dma_dst = c->phys_base + bram_offset;
 405         if (dma_mapping_error(&c->pdev->dev, dma_dst)) {
 406                 dev_err(&c->pdev->dev,
 407                         "Couldn't DMA map a %d byte buffer\n",
 408                         count);
 409                 return -1;
 410         }
 411
 412         omap_set_dma_transfer_params(c->dma_channel, OMAP_DMA_DATA_TYPE_S32,
 413                                      count >> 2, 1, 0, 0, 0);
 414         omap_set_dma_src_params(c->dma_channel, 0, OMAP_DMA_AMODE_POST_INC,
 415                                 dma_src, 0, 0);
 416         omap_set_dma_dest_params(c->dma_channel, 0, OMAP_DMA_AMODE_POST_INC,
 417                                  dma_dst, 0, 0);
 418
 419         INIT_COMPLETION(c->dma_done);
 420         omap_start_dma(c->dma_channel);
 421
 422         timeout = jiffies + msecs_to_jiffies(20);
 423         done = &c->dma_done.done;
 424         while (time_before(jiffies, timeout))
 425                 if (*done)
 426                         break;
 427
 428         dma_unmap_single(&c->pdev->dev, dma_dst, count, DMA_TO_DEVICE);
 429
 430         if (!*done) {
 431                 dev_err(&c->pdev->dev, "timeout waiting for DMA\n");
 432                 goto out_copy;
 433         }
 434
 435         return 0;
 436
 437 out_copy:
 438         memcpy(this->base + bram_offset, buf, count);
 439         return 0;
 440 }
 441
 442 #else
 443
 444 int omap3_onenand_read_bufferram(struct mtd_info *mtd, int area,
 445                                  unsigned char *buffer, int offset,
 446                                  size_t count);
 447
 448 int omap3_onenand_write_bufferram(struct mtd_info *mtd, int area,
 449                                   const unsigned char *buffer,
 450                                   int offset, size_t count);
 451
 452 #endif
 453
 454 #if defined(CONFIG_ARCH_OMAP2) || defined(MULTI_OMAP2)
 455
 456 static int omap2_onenand_read_bufferram(struct mtd_info *mtd, int area,
 457                                         unsigned char *buffer, int offset,
 458                                         size_t count)
 459 {
 460         struct omap2_onenand *c = container_of(mtd, struct omap2_onenand, mtd);
 461         struct onenand_chip *this = mtd->priv;
 462         dma_addr_t dma_src, dma_dst;
 463         int bram_offset;
 464
 465         bram_offset = omap2_onenand_bufferram_offset(mtd, area) + area + offset;
 466         /* DMA is not used.  Revisit PM requirements before enabling it. */
 467         if (1 || (c->dma_channel < 0) ||
 468             ((void *) buffer >= (void *) high_memory) || (bram_offset & 3) ||
 469             (((unsigned int) buffer) & 3) || (count < 1024) || (count & 3)) {
 470                 memcpy(buffer, (__force void *)(this->base + bram_offset),
 471                        count);
 472                 return 0;
 473         }
 474
 475         dma_src = c->phys_base + bram_offset;
 476         dma_dst = dma_map_single(&c->pdev->dev, buffer, count,
 477                                  DMA_FROM_DEVICE);
 478         if (dma_mapping_error(&c->pdev->dev, dma_dst)) {
 479                 dev_err(&c->pdev->dev,
 480                         "Couldn't DMA map a %d byte buffer\n",
 481                         count);
 482                 return -1;
 483         }
 484
 485         omap_set_dma_transfer_params(c->dma_channel, OMAP_DMA_DATA_TYPE_S32,
 486                                      count / 4, 1, 0, 0, 0);
 487         omap_set_dma_src_params(c->dma_channel, 0, OMAP_DMA_AMODE_POST_INC,
 488                                 dma_src, 0, 0);
 489         omap_set_dma_dest_params(c->dma_channel, 0, OMAP_DMA_AMODE_POST_INC,
 490                                  dma_dst, 0, 0);
 491
 492         INIT_COMPLETION(c->dma_done);
 493         omap_start_dma(c->dma_channel);
 494         wait_for_completion(&c->dma_done);
 495
 496         dma_unmap_single(&c->pdev->dev, dma_dst, count, DMA_FROM_DEVICE);
 497
 498         return 0;
 499 }
 500
 501 static int omap2_onenand_write_bufferram(struct mtd_info *mtd, int area,
 502                                          const unsigned char *buffer,
 503                                          int offset, size_t count)
 504 {
 505         struct omap2_onenand *c = container_of(mtd, struct omap2_onenand, mtd);
 506         struct onenand_chip *this = mtd->priv;
 507         dma_addr_t dma_src, dma_dst;
 508         int bram_offset;
 509
 510         bram_offset = omap2_onenand_bufferram_offset(mtd, area) + area + offset;
 511         /* DMA is not used.  Revisit PM requirements before enabling it. */
 512         if (1 || (c->dma_channel < 0) ||
 513             ((void *) buffer >= (void *) high_memory) || (bram_offset & 3) ||
 514             (((unsigned int) buffer) & 3) || (count < 1024) || (count & 3)) {
 515                 memcpy((__force void *)(this->base + bram_offset), buffer,
 516                        count);
 517                 return 0;
 518         }
 519
 520         dma_src = dma_map_single(&c->pdev->dev, (void *) buffer, count,
 521                                  DMA_TO_DEVICE);
 522         dma_dst = c->phys_base + bram_offset;
 523         if (dma_mapping_error(&c->pdev->dev, dma_dst)) {
 524                 dev_err(&c->pdev->dev,
 525                         "Couldn't DMA map a %d byte buffer\n",
 526                         count);
 527                 return -1;
 528         }
 529
 530         omap_set_dma_transfer_params(c->dma_channel, OMAP_DMA_DATA_TYPE_S16,
 531                                      count / 2, 1, 0, 0, 0);
 532         omap_set_dma_src_params(c->dma_channel, 0, OMAP_DMA_AMODE_POST_INC,
 533                                 dma_src, 0, 0);
 534         omap_set_dma_dest_params(c->dma_channel, 0, OMAP_DMA_AMODE_POST_INC,
 535                                  dma_dst, 0, 0);
 536
 537         INIT_COMPLETION(c->dma_done);
 538         omap_start_dma(c->dma_channel);
 539         wait_for_completion(&c->dma_done);
 540
 541         dma_unmap_single(&c->pdev->dev, dma_dst, count, DMA_TO_DEVICE);
 542
 543         return 0;
 544 }
 545
 546 #else
 547
 548 int omap2_onenand_read_bufferram(struct mtd_info *mtd, int area,
 549                                  unsigned char *buffer, int offset,
 550                                  size_t count);
 551
 552 int omap2_onenand_write_bufferram(struct mtd_info *mtd, int area,
 553                                   const unsigned char *buffer,
 554                                   int offset, size_t count);
 555
 556 #endif
 557
 558 static struct platform_driver omap2_onenand_driver;
 559
 560 static int __adjust_timing(struct device *dev, void *data)
 561 {
 562         int ret = 0;
 563         struct omap2_onenand *c;
 564
 565         c = dev_get_drvdata(dev);
 566
 567         BUG_ON(c->setup == NULL);
 568
 569         /* DMA is not in use so this is all that is needed */
 570         /* Revisit for OMAP3! */
 571         ret = c->setup(c->onenand.base, c->freq);
 572
 573         return ret;
 574 }
 575
 576 int omap2_onenand_rephase(void)
 577 {
 578         return driver_for_each_device(&omap2_onenand_driver.driver, NULL,
 579                                       NULL, __adjust_timing);
 580 }
 581
 582 static void omap2_onenand_shutdown(struct platform_device *pdev)
 583 {
 584         struct omap2_onenand *c = dev_get_drvdata(&pdev->dev);
 585
 586         /* With certain content in the buffer RAM, the OMAP boot ROM code
 587          * can recognize the flash chip incorrectly. Zero it out before
 588          * soft reset.
 589          */
 590         memset((__force void *)c->onenand.base, 0, ONENAND_BUFRAM_SIZE);
 591 }
 592
 593 static int __devinit omap2_onenand_probe(struct platform_device *pdev)
 594 {
 595         struct omap_onenand_platform_data *pdata;
 596         struct omap2_onenand *c;
 597         int r;
 598
 599         pdata = pdev->dev.platform_data;
 600         if (pdata == NULL) {
 601                 dev_err(&pdev->dev, "platform data missing\n");
 602                 return -ENODEV;
 603         }
 604
 605         c = kzalloc(sizeof(struct omap2_onenand), GFP_KERNEL);
 606         if (!c)
 607                 return -ENOMEM;
 608
 609         init_completion(&c->irq_done);
 610         init_completion(&c->dma_done);
 611         c->gpmc_cs = pdata->cs;
 612         c->gpio_irq = pdata->gpio_irq;
 613         c->dma_channel = pdata->dma_channel;
 614         if (c->dma_channel < 0) {
 615                 /* if -1, don't use DMA */
 616                 c->gpio_irq = 0;
 617         }
 618
 619         r = gpmc_cs_request(c->gpmc_cs, ONENAND_IO_SIZE, &c->phys_base);
 620         if (r < 0) {
 621                 dev_err(&pdev->dev, "Cannot request GPMC CS\n");
 622                 goto err_kfree;
 623         }
 624
 625         if (request_mem_region(c->phys_base, ONENAND_IO_SIZE,
 626                                pdev->dev.driver->name) == NULL) {
 627                 dev_err(&pdev->dev, "Cannot reserve memory region at 0x%08lx, "
 628                         "size: 0x%x\n", c->phys_base, ONENAND_IO_SIZE);
 629                 r = -EBUSY;
 630                 goto err_free_cs;
 631         }
 632         c->onenand.base = ioremap(c->phys_base, ONENAND_IO_SIZE);
 633         if (c->onenand.base == NULL) {
 634                 r = -ENOMEM;
 635                 goto err_release_mem_region;
 636         }
 637
 638         if (pdata->onenand_setup != NULL) {
 639                 r = pdata->onenand_setup(c->onenand.base, c->freq);
 640                 if (r < 0) {
 641                         dev_err(&pdev->dev, "Onenand platform setup failed: "
 642                                 "%d\n", r);
 643                         goto err_iounmap;
 644                 }
 645                 c->setup = pdata->onenand_setup;
 646         }
 647
 648         if (c->gpio_irq) {
 649                 if ((r = gpio_request(c->gpio_irq, "OneNAND irq")) < 0) {
 650                         dev_err(&pdev->dev,  "Failed to request GPIO%d for "
 651                                 "OneNAND\n", c->gpio_irq);
 652                         goto err_iounmap;
 653         }
 654         gpio_direction_input(c->gpio_irq);
 655
 656         if ((r = request_irq(gpio_to_irq(c->gpio_irq),
 657                              omap2_onenand_interrupt, IRQF_TRIGGER_RISING,
 658                              pdev->dev.driver->name, c)) < 0)
 659                 goto err_release_gpio;
 660         }
 661
 662         if (c->dma_channel >= 0) {
 663                 r = omap_request_dma(0, pdev->dev.driver->name,
 664                                      omap2_onenand_dma_cb, (void *) c,
 665                                      &c->dma_channel);
 666                 if (r == 0) {
 667                         omap_set_dma_write_mode(c->dma_channel,
 668                                                 OMAP_DMA_WRITE_NON_POSTED);
 669                         omap_set_dma_src_data_pack(c->dma_channel, 1);
 670                         omap_set_dma_src_burst_mode(c->dma_channel,
 671                                                     OMAP_DMA_DATA_BURST_8);
 672                         omap_set_dma_dest_data_pack(c->dma_channel, 1);
 673                         omap_set_dma_dest_burst_mode(c->dma_channel,
 674                                                      OMAP_DMA_DATA_BURST_8);
 675                 } else {
 676                         dev_info(&pdev->dev,
 677                                  "failed to allocate DMA for OneNAND, "
 678                                  "using PIO instead\n");
 679                         c->dma_channel = -1;
 680                 }
 681         }
 682
 683         dev_info(&pdev->dev, "initializing on CS%d, phys base 0x%08lx, virtual "
 684                  "base %p\n", c->gpmc_cs, c->phys_base,
 685                  c->onenand.base);
 686
 687         c->pdev = pdev;
 688         c->mtd.name = dev_name(&pdev->dev);
 689         c->mtd.priv = &c->onenand;
 690         c->mtd.owner = THIS_MODULE;
 691
 692         c->mtd.dev.parent = &pdev->dev;
 693
 694         if (c->dma_channel >= 0) {
 695                 struct onenand_chip *this = &c->onenand;
 696
 697                 this->wait = omap2_onenand_wait;
 698                 if (cpu_is_omap34xx()) {
 699                         this->read_bufferram = omap3_onenand_read_bufferram;
 700                         this->write_bufferram = omap3_onenand_write_bufferram;
 701                 } else {
 702                         this->read_bufferram = omap2_onenand_read_bufferram;
 703                         this->write_bufferram = omap2_onenand_write_bufferram;
 704                 }
 705         }
 706
 707         if ((r = onenand_scan(&c->mtd, 1)) < 0)
 708                 goto err_release_dma;
 709
 710         switch ((c->onenand.version_id >> 4) & 0xf) {
 711         case 0:
 712                 c->freq = 40;
 713                 break;
 714         case 1:
 715                 c->freq = 54;
 716                 break;
 717         case 2:
 718                 c->freq = 66;
 719                 break;
 720         case 3:
 721                 c->freq = 83;
 722                 break;
 723         }
 724
 725 #ifdef CONFIG_MTD_PARTITIONS
 726         if (pdata->parts != NULL)
 727                 r = add_mtd_partitions(&c->mtd, pdata->parts,
 728                                        pdata->nr_parts);
 729         else
 730 #endif
 731                 r = add_mtd_device(&c->mtd);
 732         if (r < 0)
 733                 goto err_release_onenand;
 734
 735         platform_set_drvdata(pdev, c);
 736
 737         return 0;
 738
 739 err_release_onenand:
 740         onenand_release(&c->mtd);
 741 err_release_dma:
 742         if (c->dma_channel != -1)
 743                 omap_free_dma(c->dma_channel);
 744         if (c->gpio_irq)
 745                 free_irq(gpio_to_irq(c->gpio_irq), c);
 746 err_release_gpio:
 747         if (c->gpio_irq)
 748                 gpio_free(c->gpio_irq);
 749 err_iounmap:
 750         iounmap(c->onenand.base);
 751 err_release_mem_region:
 752         release_mem_region(c->phys_base, ONENAND_IO_SIZE);
 753 err_free_cs:
 754         gpmc_cs_free(c->gpmc_cs);
 755 err_kfree:
 756         kfree(c);
 757
 758         return r;
 759 }
 760
 761 static int __devexit omap2_onenand_remove(struct platform_device *pdev)
 762 {
 763         struct omap2_onenand *c = dev_get_drvdata(&pdev->dev);
 764
 765         BUG_ON(c == NULL);
 766
 767 #ifdef CONFIG_MTD_PARTITIONS
 768         if (c->parts)
 769                 del_mtd_partitions(&c->mtd);
 770         else
 771                 del_mtd_device(&c->mtd);
 772 #else
 773         del_mtd_device(&c->mtd);
 774 #endif
 775
 776         onenand_release(&c->mtd);
 777         if (c->dma_channel != -1)
 778                 omap_free_dma(c->dma_channel);
 779         omap2_onenand_shutdown(pdev);
 780         platform_set_drvdata(pdev, NULL);
 781         if (c->gpio_irq) {
 782                 free_irq(gpio_to_irq(c->gpio_irq), c);
 783                 gpio_free(c->gpio_irq);
 784         }
 785         iounmap(c->onenand.base);
 786         release_mem_region(c->phys_base, ONENAND_IO_SIZE);
 787         gpmc_cs_free(c->gpmc_cs);
 788         kfree(c);
 789
 790         return 0;
 791 }
 792
 793 static struct platform_driver omap2_onenand_driver = {
 794         .probe          = omap2_onenand_probe,
 795         .remove         = __devexit_p(omap2_onenand_remove),
 796         .shutdown       = omap2_onenand_shutdown,
 797         .driver         = {
 798                 .name   = DRIVER_NAME,
 799                 .owner  = THIS_MODULE,
 800         },
 801 };
 802
 803 static int __init omap2_onenand_init(void)
 804 {
 805         printk(KERN_INFO "OneNAND driver initializing\n");
 806         return platform_driver_register(&omap2_onenand_driver);
 807 }
 808
 809 static void __exit omap2_onenand_exit(void)
 810 {
 811         platform_driver_unregister(&omap2_onenand_driver);
 812 }
 813
 814 module_init(omap2_onenand_init);
 815 module_exit(omap2_onenand_exit);
 816
 817 MODULE_ALIAS(DRIVER_NAME);
 818 MODULE_LICENSE("GPL");
 819 MODULE_AUTHOR("Jarkko Lavinen <jarkko.lavinen@nokia.com>");
 820 MODULE_DESCRIPTION("Glue layer for OneNAND flash on OMAP2 / OMAP3");