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 #include <linux/slab.h>
  38
  39 #include <asm/mach/flash.h>
  40 #include <plat/gpmc.h>
  41 #include <plat/onenand.h>
  42 #include <mach/gpio.h>
  43
  44 #include <plat/dma.h>
  45
  46 #include <plat/board.h>
  47
  48 #define DRIVER_NAME "omap2-onenand"
  49
  50 #define ONENAND_IO_SIZE         SZ_128K
  51 #define ONENAND_BUFRAM_SIZE     (1024 * 5)
  52
  53 struct omap2_onenand {
  54         struct platform_device *pdev;
  55         int gpmc_cs;
  56         unsigned long phys_base;
  57         int gpio_irq;
  58         struct mtd_info mtd;
  59         struct mtd_partition *parts;
  60         struct onenand_chip onenand;
  61         struct completion irq_done;
  62         struct completion dma_done;
  63         int dma_channel;
  64         int freq;
  65         int (*setup)(void __iomem *base, int freq);
  66 };
  67
  68 static void omap2_onenand_dma_cb(int lch, u16 ch_status, void *data)
  69 {
  70         struct omap2_onenand *c = data;
  71
  72         complete(&c->dma_done);
  73 }
  74
  75 static irqreturn_t omap2_onenand_interrupt(int irq, void *dev_id)
  76 {
  77         struct omap2_onenand *c = dev_id;
  78
  79         complete(&c->irq_done);
  80
  81         return IRQ_HANDLED;
  82 }
  83
  84 static inline unsigned short read_reg(struct omap2_onenand *c, int reg)
  85 {
  86         return readw(c->onenand.base + reg);
  87 }
  88
  89 static inline void write_reg(struct omap2_onenand *c, unsigned short value,
  90                              int reg)
  91 {
  92         writew(value, c->onenand.base + reg);
  93 }
  94
  95 static void wait_err(char *msg, int state, unsigned int ctrl, unsigned int intr)
  96 {
  97         printk(KERN_ERR "onenand_wait: %s! state %d ctrl 0x%04x intr 0x%04x\n",
  98                msg, state, ctrl, intr);
  99 }
 100
 101 static void wait_warn(char *msg, int state, unsigned int ctrl,
 102                       unsigned int intr)
 103 {
 104         printk(KERN_WARNING "onenand_wait: %s! state %d ctrl 0x%04x "
 105                "intr 0x%04x\n", msg, state, ctrl, intr);
 106 }
 107
 108 static int omap2_onenand_wait(struct mtd_info *mtd, int state)
 109 {
 110         struct omap2_onenand *c = container_of(mtd, struct omap2_onenand, mtd);
 111         unsigned int intr = 0;
 112         unsigned int ctrl;
 113         unsigned long timeout;
 114         u32 syscfg;
 115
 116         if (state == FL_RESETING || state == FL_PREPARING_ERASE ||
 117             state == FL_VERIFYING_ERASE) {
 118                 int i = 21;
 119                 unsigned int intr_flags = ONENAND_INT_MASTER;
 120
 121                 switch (state) {
 122                 case FL_RESETING:
 123                         intr_flags |= ONENAND_INT_RESET;
 124                         break;
 125                 case FL_PREPARING_ERASE:
 126                         intr_flags |= ONENAND_INT_ERASE;
 127                         break;
 128                 case FL_VERIFYING_ERASE:
 129                         i = 101;
 130                         break;
 131                 }
 132
 133                 while (--i) {
 134                         udelay(1);
 135                         intr = read_reg(c, ONENAND_REG_INTERRUPT);
 136                         if (intr & ONENAND_INT_MASTER)
 137                                 break;
 138                 }
 139                 ctrl = read_reg(c, ONENAND_REG_CTRL_STATUS);
 140                 if (ctrl & ONENAND_CTRL_ERROR) {
 141                         wait_err("controller error", state, ctrl, intr);
 142                         return -EIO;
 143                 }
 144                 if ((intr & intr_flags) != intr_flags) {
 145                         wait_err("timeout", state, ctrl, intr);
 146                         return -EIO;
 147                 }
 148                 return 0;
 149         }
 150
 151         if (state != FL_READING) {
 152                 int result;
 153
 154                 /* Turn interrupts on */
 155                 syscfg = read_reg(c, ONENAND_REG_SYS_CFG1);
 156                 if (!(syscfg & ONENAND_SYS_CFG1_IOBE)) {
 157                         syscfg |= ONENAND_SYS_CFG1_IOBE;
 158                         write_reg(c, syscfg, ONENAND_REG_SYS_CFG1);
 159                         if (cpu_is_omap34xx())
 160                                 /* Add a delay to let GPIO settle */
 161                                 syscfg = read_reg(c, ONENAND_REG_SYS_CFG1);
 162                 }
 163
 164                 INIT_COMPLETION(c->irq_done);
 165                 if (c->gpio_irq) {
 166                         result = gpio_get_value(c->gpio_irq);
 167                         if (result == -1) {
 168                                 ctrl = read_reg(c, ONENAND_REG_CTRL_STATUS);
 169                                 intr = read_reg(c, ONENAND_REG_INTERRUPT);
 170                                 wait_err("gpio error", state, ctrl, intr);
 171                                 return -EIO;
 172                         }
 173                 } else
 174                         result = 0;
 175                 if (result == 0) {
 176                         int retry_cnt = 0;
 177 retry:
 178                         result = wait_for_completion_timeout(&c->irq_done,
 179                                                     msecs_to_jiffies(20));
 180                         if (result == 0) {
 181                                 /* Timeout after 20ms */
 182                                 ctrl = read_reg(c, ONENAND_REG_CTRL_STATUS);
 183                                 if (ctrl & ONENAND_CTRL_ONGO) {
 184                                         /*
 185                                          * The operation seems to be still going
 186                                          * so give it some more time.
 187                                          */
 188                                         retry_cnt += 1;
 189                                         if (retry_cnt < 3)
 190                                                 goto retry;
 191                                         intr = read_reg(c,
 192                                                         ONENAND_REG_INTERRUPT);
 193                                         wait_err("timeout", state, ctrl, intr);
 194                                         return -EIO;
 195                                 }
 196                                 intr = read_reg(c, ONENAND_REG_INTERRUPT);
 197                                 if ((intr & ONENAND_INT_MASTER) == 0)
 198                                         wait_warn("timeout", state, ctrl, intr);
 199                         }
 200                 }
 201         } else {
 202                 int retry_cnt = 0;
 203
 204                 /* Turn interrupts off */
 205                 syscfg = read_reg(c, ONENAND_REG_SYS_CFG1);
 206                 syscfg &= ~ONENAND_SYS_CFG1_IOBE;
 207                 write_reg(c, syscfg, ONENAND_REG_SYS_CFG1);
 208
 209                 timeout = jiffies + msecs_to_jiffies(20);
 210                 while (1) {
 211                         if (time_before(jiffies, timeout)) {
 212                                 intr = read_reg(c, ONENAND_REG_INTERRUPT);
 213                                 if (intr & ONENAND_INT_MASTER)
 214                                         break;
 215                         } else {
 216                                 /* Timeout after 20ms */
 217                                 ctrl = read_reg(c, ONENAND_REG_CTRL_STATUS);
 218                                 if (ctrl & ONENAND_CTRL_ONGO) {
 219                                         /*
 220                                          * The operation seems to be still going
 221                                          * so give it some more time.
 222                                          */
 223                                         retry_cnt += 1;
 224                                         if (retry_cnt < 3) {
 225                                                 timeout = jiffies +
 226                                                           msecs_to_jiffies(20);
 227                                                 continue;
 228                                         }
 229                                 }
 230                                 break;
 231                         }
 232                 }
 233         }
 234
 235         intr = read_reg(c, ONENAND_REG_INTERRUPT);
 236         ctrl = read_reg(c, ONENAND_REG_CTRL_STATUS);
 237
 238         if (intr & ONENAND_INT_READ) {
 239                 int ecc = read_reg(c, ONENAND_REG_ECC_STATUS);
 240
 241                 if (ecc) {
 242                         unsigned int addr1, addr8;
 243
 244                         addr1 = read_reg(c, ONENAND_REG_START_ADDRESS1);
 245                         addr8 = read_reg(c, ONENAND_REG_START_ADDRESS8);
 246                         if (ecc & ONENAND_ECC_2BIT_ALL) {
 247                                 printk(KERN_ERR "onenand_wait: ECC error = "
 248                                        "0x%04x, addr1 %#x, addr8 %#x\n",
 249                                        ecc, addr1, addr8);
 250                                 mtd->ecc_stats.failed++;
 251                                 return -EBADMSG;
 252                         } else if (ecc & ONENAND_ECC_1BIT_ALL) {
 253                                 printk(KERN_NOTICE "onenand_wait: correctable "
 254                                        "ECC error = 0x%04x, addr1 %#x, "
 255                                        "addr8 %#x\n", ecc, addr1, addr8);
 256                                 mtd->ecc_stats.corrected++;
 257                         }
 258                 }
 259         } else if (state == FL_READING) {
 260                 wait_err("timeout", state, ctrl, intr);
 261                 return -EIO;
 262         }
 263
 264         if (ctrl & ONENAND_CTRL_ERROR) {
 265                 wait_err("controller error", state, ctrl, intr);
 266                 if (ctrl & ONENAND_CTRL_LOCK)
 267                         printk(KERN_ERR "onenand_wait: "
 268                                         "Device is write protected!!!\n");
 269                 return -EIO;
 270         }
 271
 272         if (ctrl & 0xFE9F)
 273                 wait_warn("unexpected controller status", state, ctrl, intr);
 274
 275         return 0;
 276 }
 277
 278 static inline int omap2_onenand_bufferram_offset(struct mtd_info *mtd, int area)
 279 {
 280         struct onenand_chip *this = mtd->priv;
 281
 282         if (ONENAND_CURRENT_BUFFERRAM(this)) {
 283                 if (area == ONENAND_DATARAM)
 284                         return this->writesize;
 285                 if (area == ONENAND_SPARERAM)
 286                         return mtd->oobsize;
 287         }
 288
 289         return 0;
 290 }
 291
 292 #if defined(CONFIG_ARCH_OMAP3) || defined(MULTI_OMAP2)
 293
 294 static int omap3_onenand_read_bufferram(struct mtd_info *mtd, int area,
 295                                         unsigned char *buffer, int offset,
 296                                         size_t count)
 297 {
 298         struct omap2_onenand *c = container_of(mtd, struct omap2_onenand, mtd);
 299         struct onenand_chip *this = mtd->priv;
 300         dma_addr_t dma_src, dma_dst;
 301         int bram_offset;
 302         unsigned long timeout;
 303         void *buf = (void *)buffer;
 304         size_t xtra;
 305         volatile unsigned *done;
 306
 307         bram_offset = omap2_onenand_bufferram_offset(mtd, area) + area + offset;
 308         if (bram_offset & 3 || (size_t)buf & 3 || count < 384)
 309                 goto out_copy;
 310
 311         /* panic_write() may be in an interrupt context */
 312         if (in_interrupt() || oops_in_progress)
 313                 goto out_copy;
 314
 315         if (buf >= high_memory) {
 316                 struct page *p1;
 317
 318                 if (((size_t)buf & PAGE_MASK) !=
 319                     ((size_t)(buf + count - 1) & PAGE_MASK))
 320                         goto out_copy;
 321                 p1 = vmalloc_to_page(buf);
 322                 if (!p1)
 323                         goto out_copy;
 324                 buf = page_address(p1) + ((size_t)buf & ~PAGE_MASK);
 325         }
 326
 327         xtra = count & 3;
 328         if (xtra) {
 329                 count -= xtra;
 330                 memcpy(buf + count, this->base + bram_offset + count, xtra);
 331         }
 332
 333         dma_src = c->phys_base + bram_offset;
 334         dma_dst = dma_map_single(&c->pdev->dev, buf, count, DMA_FROM_DEVICE);
 335         if (dma_mapping_error(&c->pdev->dev, dma_dst)) {
 336                 dev_err(&c->pdev->dev,
 337                         "Couldn't DMA map a %d byte buffer\n",
 338                         count);
 339                 goto out_copy;
 340         }
 341
 342         omap_set_dma_transfer_params(c->dma_channel, OMAP_DMA_DATA_TYPE_S32,
 343                                      count >> 2, 1, 0, 0, 0);
 344         omap_set_dma_src_params(c->dma_channel, 0, OMAP_DMA_AMODE_POST_INC,
 345                                 dma_src, 0, 0);
 346         omap_set_dma_dest_params(c->dma_channel, 0, OMAP_DMA_AMODE_POST_INC,
 347                                  dma_dst, 0, 0);
 348
 349         INIT_COMPLETION(c->dma_done);
 350         omap_start_dma(c->dma_channel);
 351
 352         timeout = jiffies + msecs_to_jiffies(20);
 353         done = &c->dma_done.done;
 354         while (time_before(jiffies, timeout))
 355                 if (*done)
 356                         break;
 357
 358         dma_unmap_single(&c->pdev->dev, dma_dst, count, DMA_FROM_DEVICE);
 359
 360         if (!*done) {
 361                 dev_err(&c->pdev->dev, "timeout waiting for DMA\n");
 362                 goto out_copy;
 363         }
 364
 365         return 0;
 366
 367 out_copy:
 368         memcpy(buf, this->base + bram_offset, count);
 369         return 0;
 370 }
 371
 372 static int omap3_onenand_write_bufferram(struct mtd_info *mtd, int area,
 373                                          const unsigned char *buffer,
 374                                          int offset, size_t count)
 375 {
 376         struct omap2_onenand *c = container_of(mtd, struct omap2_onenand, mtd);
 377         struct onenand_chip *this = mtd->priv;
 378         dma_addr_t dma_src, dma_dst;
 379         int bram_offset;
 380         unsigned long timeout;
 381         void *buf = (void *)buffer;
 382         volatile unsigned *done;
 383
 384         bram_offset = omap2_onenand_bufferram_offset(mtd, area) + area + offset;
 385         if (bram_offset & 3 || (size_t)buf & 3 || count < 384)
 386                 goto out_copy;
 387
 388         /* panic_write() may be in an interrupt context */
 389         if (in_interrupt() || oops_in_progress)
 390                 goto out_copy;
 391
 392         if (buf >= high_memory) {
 393                 struct page *p1;
 394
 395                 if (((size_t)buf & PAGE_MASK) !=
 396                     ((size_t)(buf + count - 1) & PAGE_MASK))
 397                         goto out_copy;
 398                 p1 = vmalloc_to_page(buf);
 399                 if (!p1)
 400                         goto out_copy;
 401                 buf = page_address(p1) + ((size_t)buf & ~PAGE_MASK);
 402         }
 403
 404         dma_src = dma_map_single(&c->pdev->dev, buf, count, DMA_TO_DEVICE);
 405         dma_dst = c->phys_base + bram_offset;
 406         if (dma_mapping_error(&c->pdev->dev, dma_src)) {
 407                 dev_err(&c->pdev->dev,
 408                         "Couldn't DMA map a %d byte buffer\n",
 409                         count);
 410                 return -1;
 411         }
 412
 413         omap_set_dma_transfer_params(c->dma_channel, OMAP_DMA_DATA_TYPE_S32,
 414                                      count >> 2, 1, 0, 0, 0);
 415         omap_set_dma_src_params(c->dma_channel, 0, OMAP_DMA_AMODE_POST_INC,
 416                                 dma_src, 0, 0);
 417         omap_set_dma_dest_params(c->dma_channel, 0, OMAP_DMA_AMODE_POST_INC,
 418                                  dma_dst, 0, 0);
 419
 420         INIT_COMPLETION(c->dma_done);
 421         omap_start_dma(c->dma_channel);
 422
 423         timeout = jiffies + msecs_to_jiffies(20);
 424         done = &c->dma_done.done;
 425         while (time_before(jiffies, timeout))
 426                 if (*done)
 427                         break;
 428
 429         dma_unmap_single(&c->pdev->dev, dma_src, count, DMA_TO_DEVICE);
 430
 431         if (!*done) {
 432                 dev_err(&c->pdev->dev, "timeout waiting for DMA\n");
 433                 goto out_copy;
 434         }
 435
 436         return 0;
 437
 438 out_copy:
 439         memcpy(this->base + bram_offset, buf, count);
 440         return 0;
 441 }
 442
 443 #else
 444
 445 int omap3_onenand_read_bufferram(struct mtd_info *mtd, int area,
 446                                  unsigned char *buffer, int offset,
 447                                  size_t count);
 448
 449 int omap3_onenand_write_bufferram(struct mtd_info *mtd, int area,
 450                                   const unsigned char *buffer,
 451                                   int offset, size_t count);
 452
 453 #endif
 454
 455 #if defined(CONFIG_ARCH_OMAP2) || defined(MULTI_OMAP2)
 456
 457 static int omap2_onenand_read_bufferram(struct mtd_info *mtd, int area,
 458                                         unsigned char *buffer, int offset,
 459                                         size_t count)
 460 {
 461         struct omap2_onenand *c = container_of(mtd, struct omap2_onenand, mtd);
 462         struct onenand_chip *this = mtd->priv;
 463         dma_addr_t dma_src, dma_dst;
 464         int bram_offset;
 465
 466         bram_offset = omap2_onenand_bufferram_offset(mtd, area) + area + offset;
 467         /* DMA is not used.  Revisit PM requirements before enabling it. */
 468         if (1 || (c->dma_channel < 0) ||
 469             ((void *) buffer >= (void *) high_memory) || (bram_offset & 3) ||
 470             (((unsigned int) buffer) & 3) || (count < 1024) || (count & 3)) {
 471                 memcpy(buffer, (__force void *)(this->base + bram_offset),
 472                        count);
 473                 return 0;
 474         }
 475
 476         dma_src = c->phys_base + bram_offset;
 477         dma_dst = dma_map_single(&c->pdev->dev, buffer, count,
 478                                  DMA_FROM_DEVICE);
 479         if (dma_mapping_error(&c->pdev->dev, dma_dst)) {
 480                 dev_err(&c->pdev->dev,
 481                         "Couldn't DMA map a %d byte buffer\n",
 482                         count);
 483                 return -1;
 484         }
 485
 486         omap_set_dma_transfer_params(c->dma_channel, OMAP_DMA_DATA_TYPE_S32,
 487                                      count / 4, 1, 0, 0, 0);
 488         omap_set_dma_src_params(c->dma_channel, 0, OMAP_DMA_AMODE_POST_INC,
 489                                 dma_src, 0, 0);
 490         omap_set_dma_dest_params(c->dma_channel, 0, OMAP_DMA_AMODE_POST_INC,
 491                                  dma_dst, 0, 0);
 492
 493         INIT_COMPLETION(c->dma_done);
 494         omap_start_dma(c->dma_channel);
 495         wait_for_completion(&c->dma_done);
 496
 497         dma_unmap_single(&c->pdev->dev, dma_dst, count, DMA_FROM_DEVICE);
 498
 499         return 0;
 500 }
 501
 502 static int omap2_onenand_write_bufferram(struct mtd_info *mtd, int area,
 503                                          const unsigned char *buffer,
 504                                          int offset, size_t count)
 505 {
 506         struct omap2_onenand *c = container_of(mtd, struct omap2_onenand, mtd);
 507         struct onenand_chip *this = mtd->priv;
 508         dma_addr_t dma_src, dma_dst;
 509         int bram_offset;
 510
 511         bram_offset = omap2_onenand_bufferram_offset(mtd, area) + area + offset;
 512         /* DMA is not used.  Revisit PM requirements before enabling it. */
 513         if (1 || (c->dma_channel < 0) ||
 514             ((void *) buffer >= (void *) high_memory) || (bram_offset & 3) ||
 515             (((unsigned int) buffer) & 3) || (count < 1024) || (count & 3)) {
 516                 memcpy((__force void *)(this->base + bram_offset), buffer,
 517                        count);
 518                 return 0;
 519         }
 520
 521         dma_src = dma_map_single(&c->pdev->dev, (void *) buffer, count,
 522                                  DMA_TO_DEVICE);
 523         dma_dst = c->phys_base + bram_offset;
 524         if (dma_mapping_error(&c->pdev->dev, dma_src)) {
 525                 dev_err(&c->pdev->dev,
 526                         "Couldn't DMA map a %d byte buffer\n",
 527                         count);
 528                 return -1;
 529         }
 530
 531         omap_set_dma_transfer_params(c->dma_channel, OMAP_DMA_DATA_TYPE_S16,
 532                                      count / 2, 1, 0, 0, 0);
 533         omap_set_dma_src_params(c->dma_channel, 0, OMAP_DMA_AMODE_POST_INC,
 534                                 dma_src, 0, 0);
 535         omap_set_dma_dest_params(c->dma_channel, 0, OMAP_DMA_AMODE_POST_INC,
 536                                  dma_dst, 0, 0);
 537
 538         INIT_COMPLETION(c->dma_done);
 539         omap_start_dma(c->dma_channel);
 540         wait_for_completion(&c->dma_done);
 541
 542         dma_unmap_single(&c->pdev->dev, dma_src, count, DMA_TO_DEVICE);
 543
 544         return 0;
 545 }
 546
 547 #else
 548
 549 int omap2_onenand_read_bufferram(struct mtd_info *mtd, int area,
 550                                  unsigned char *buffer, int offset,
 551                                  size_t count);
 552
 553 int omap2_onenand_write_bufferram(struct mtd_info *mtd, int area,
 554                                   const unsigned char *buffer,
 555                                   int offset, size_t count);
 556
 557 #endif
 558
 559 static struct platform_driver omap2_onenand_driver;
 560
 561 static int __adjust_timing(struct device *dev, void *data)
 562 {
 563         int ret = 0;
 564         struct omap2_onenand *c;
 565
 566         c = dev_get_drvdata(dev);
 567
 568         BUG_ON(c->setup == NULL);
 569
 570         /* DMA is not in use so this is all that is needed */
 571         /* Revisit for OMAP3! */
 572         ret = c->setup(c->onenand.base, c->freq);
 573
 574         return ret;
 575 }
 576
 577 int omap2_onenand_rephase(void)
 578 {
 579         return driver_for_each_device(&omap2_onenand_driver.driver, NULL,
 580                                       NULL, __adjust_timing);
 581 }
 582
 583 static void omap2_onenand_shutdown(struct platform_device *pdev)
 584 {
 585         struct omap2_onenand *c = dev_get_drvdata(&pdev->dev);
 586
 587         /* With certain content in the buffer RAM, the OMAP boot ROM code
 588          * can recognize the flash chip incorrectly. Zero it out before
 589          * soft reset.
 590          */
 591         memset((__force void *)c->onenand.base, 0, ONENAND_BUFRAM_SIZE);
 592 }
 593
 594 static int __devinit omap2_onenand_probe(struct platform_device *pdev)
 595 {
 596         struct omap_onenand_platform_data *pdata;
 597         struct omap2_onenand *c;
 598         int r;
 599
 600         pdata = pdev->dev.platform_data;
 601         if (pdata == NULL) {
 602                 dev_err(&pdev->dev, "platform data missing\n");
 603                 return -ENODEV;
 604         }
 605
 606         c = kzalloc(sizeof(struct omap2_onenand), GFP_KERNEL);
 607         if (!c)
 608                 return -ENOMEM;
 609
 610         init_completion(&c->irq_done);
 611         init_completion(&c->dma_done);
 612         c->gpmc_cs = pdata->cs;
 613         c->gpio_irq = pdata->gpio_irq;
 614         c->dma_channel = pdata->dma_channel;
 615         if (c->dma_channel < 0) {
 616                 /* if -1, don't use DMA */
 617                 c->gpio_irq = 0;
 618         }
 619
 620         r = gpmc_cs_request(c->gpmc_cs, ONENAND_IO_SIZE, &c->phys_base);
 621         if (r < 0) {
 622                 dev_err(&pdev->dev, "Cannot request GPMC CS\n");
 623                 goto err_kfree;
 624         }
 625
 626         if (request_mem_region(c->phys_base, ONENAND_IO_SIZE,
 627                                pdev->dev.driver->name) == NULL) {
 628                 dev_err(&pdev->dev, "Cannot reserve memory region at 0x%08lx, "
 629                         "size: 0x%x\n", c->phys_base, ONENAND_IO_SIZE);
 630                 r = -EBUSY;
 631                 goto err_free_cs;
 632         }
 633         c->onenand.base = ioremap(c->phys_base, ONENAND_IO_SIZE);
 634         if (c->onenand.base == NULL) {
 635                 r = -ENOMEM;
 636                 goto err_release_mem_region;
 637         }
 638
 639         if (pdata->onenand_setup != NULL) {
 640                 r = pdata->onenand_setup(c->onenand.base, c->freq);
 641                 if (r < 0) {
 642                         dev_err(&pdev->dev, "Onenand platform setup failed: "
 643                                 "%d\n", r);
 644                         goto err_iounmap;
 645                 }
 646                 c->setup = pdata->onenand_setup;
 647         }
 648
 649         if (c->gpio_irq) {
 650                 if ((r = gpio_request(c->gpio_irq, "OneNAND irq")) < 0) {
 651                         dev_err(&pdev->dev,  "Failed to request GPIO%d for "
 652                                 "OneNAND\n", c->gpio_irq);
 653                         goto err_iounmap;
 654         }
 655         gpio_direction_input(c->gpio_irq);
 656
 657         if ((r = request_irq(gpio_to_irq(c->gpio_irq),
 658                              omap2_onenand_interrupt, IRQF_TRIGGER_RISING,
 659                              pdev->dev.driver->name, c)) < 0)
 660                 goto err_release_gpio;
 661         }
 662
 663         if (c->dma_channel >= 0) {
 664                 r = omap_request_dma(0, pdev->dev.driver->name,
 665                                      omap2_onenand_dma_cb, (void *) c,
 666                                      &c->dma_channel);
 667                 if (r == 0) {
 668                         omap_set_dma_write_mode(c->dma_channel,
 669                                                 OMAP_DMA_WRITE_NON_POSTED);
 670                         omap_set_dma_src_data_pack(c->dma_channel, 1);
 671                         omap_set_dma_src_burst_mode(c->dma_channel,
 672                                                     OMAP_DMA_DATA_BURST_8);
 673                         omap_set_dma_dest_data_pack(c->dma_channel, 1);
 674                         omap_set_dma_dest_burst_mode(c->dma_channel,
 675                                                      OMAP_DMA_DATA_BURST_8);
 676                 } else {
 677                         dev_info(&pdev->dev,
 678                                  "failed to allocate DMA for OneNAND, "
 679                                  "using PIO instead\n");
 680                         c->dma_channel = -1;
 681                 }
 682         }
 683
 684         dev_info(&pdev->dev, "initializing on CS%d, phys base 0x%08lx, virtual "
 685                  "base %p\n", c->gpmc_cs, c->phys_base,
 686                  c->onenand.base);
 687
 688         c->pdev = pdev;
 689         c->mtd.name = dev_name(&pdev->dev);
 690         c->mtd.priv = &c->onenand;
 691         c->mtd.owner = THIS_MODULE;
 692
 693         c->mtd.dev.parent = &pdev->dev;
 694
 695         if (c->dma_channel >= 0) {
 696                 struct onenand_chip *this = &c->onenand;
 697
 698                 this->wait = omap2_onenand_wait;
 699                 if (cpu_is_omap34xx()) {
 700                         this->read_bufferram = omap3_onenand_read_bufferram;
 701                         this->write_bufferram = omap3_onenand_write_bufferram;
 702                 } else {
 703                         this->read_bufferram = omap2_onenand_read_bufferram;
 704                         this->write_bufferram = omap2_onenand_write_bufferram;
 705                 }
 706         }
 707
 708         if ((r = onenand_scan(&c->mtd, 1)) < 0)
 709                 goto err_release_dma;
 710
 711         switch ((c->onenand.version_id >> 4) & 0xf) {
 712         case 0:
 713                 c->freq = 40;
 714                 break;
 715         case 1:
 716                 c->freq = 54;
 717                 break;
 718         case 2:
 719                 c->freq = 66;
 720                 break;
 721         case 3:
 722                 c->freq = 83;
 723                 break;
 724         }
 725
 726 #ifdef CONFIG_MTD_PARTITIONS
 727         if (pdata->parts != NULL)
 728                 r = add_mtd_partitions(&c->mtd, pdata->parts,
 729                                        pdata->nr_parts);
 730         else
 731 #endif
 732                 r = add_mtd_device(&c->mtd);
 733         if (r < 0)
 734                 goto err_release_onenand;
 735
 736         platform_set_drvdata(pdev, c);
 737
 738         return 0;
 739
 740 err_release_onenand:
 741         onenand_release(&c->mtd);
 742 err_release_dma:
 743         if (c->dma_channel != -1)
 744                 omap_free_dma(c->dma_channel);
 745         if (c->gpio_irq)
 746                 free_irq(gpio_to_irq(c->gpio_irq), c);
 747 err_release_gpio:
 748         if (c->gpio_irq)
 749                 gpio_free(c->gpio_irq);
 750 err_iounmap:
 751         iounmap(c->onenand.base);
 752 err_release_mem_region:
 753         release_mem_region(c->phys_base, ONENAND_IO_SIZE);
 754 err_free_cs:
 755         gpmc_cs_free(c->gpmc_cs);
 756 err_kfree:
 757         kfree(c);
 758
 759         return r;
 760 }
 761
 762 static int __devexit omap2_onenand_remove(struct platform_device *pdev)
 763 {
 764         struct omap2_onenand *c = dev_get_drvdata(&pdev->dev);
 765
 766         BUG_ON(c == NULL);
 767
 768 #ifdef CONFIG_MTD_PARTITIONS
 769         if (c->parts)
 770                 del_mtd_partitions(&c->mtd);
 771         else
 772                 del_mtd_device(&c->mtd);
 773 #else
 774         del_mtd_device(&c->mtd);
 775 #endif
 776
 777         onenand_release(&c->mtd);
 778         if (c->dma_channel != -1)
 779                 omap_free_dma(c->dma_channel);
 780         omap2_onenand_shutdown(pdev);
 781         platform_set_drvdata(pdev, NULL);
 782         if (c->gpio_irq) {
 783                 free_irq(gpio_to_irq(c->gpio_irq), c);
 784                 gpio_free(c->gpio_irq);
 785         }
 786         iounmap(c->onenand.base);
 787         release_mem_region(c->phys_base, ONENAND_IO_SIZE);
 788         gpmc_cs_free(c->gpmc_cs);
 789         kfree(c);
 790
 791         return 0;
 792 }
 793
 794 static struct platform_driver omap2_onenand_driver = {
 795         .probe          = omap2_onenand_probe,
 796         .remove         = __devexit_p(omap2_onenand_remove),
 797         .shutdown       = omap2_onenand_shutdown,
 798         .driver         = {
 799                 .name   = DRIVER_NAME,
 800                 .owner  = THIS_MODULE,
 801         },
 802 };
 803
 804 static int __init omap2_onenand_init(void)
 805 {
 806         printk(KERN_INFO "OneNAND driver initializing\n");
 807         return platform_driver_register(&omap2_onenand_driver);
 808 }
 809
 810 static void __exit omap2_onenand_exit(void)
 811 {
 812         platform_driver_unregister(&omap2_onenand_driver);
 813 }
 814
 815 module_init(omap2_onenand_init);
 816 module_exit(omap2_onenand_exit);
 817
 818 MODULE_ALIAS(DRIVER_NAME);
 819 MODULE_LICENSE("GPL");
 820 MODULE_AUTHOR("Jarkko Lavinen <jarkko.lavinen@nokia.com>");
 821 MODULE_DESCRIPTION("Glue layer for OneNAND flash on OMAP2 / OMAP3");