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 #include <linux/regulator/consumer.h>
  39
  40 #include <asm/mach/flash.h>
  41 #include <plat/gpmc.h>
  42 #include <plat/onenand.h>
  43 #include <asm/gpio.h>
  44
  45 #include <plat/dma.h>
  46
  47 #include <plat/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 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_ptr);
  66         struct regulator *regulator;
  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         struct onenand_chip *this = mtd->priv;
 113         unsigned int intr = 0;
 114         unsigned int ctrl, ctrl_mask;
 115         unsigned long timeout;
 116         u32 syscfg;
 117
 118         if (state == FL_RESETING || state == FL_PREPARING_ERASE ||
 119             state == FL_VERIFYING_ERASE) {
 120                 int i = 21;
 121                 unsigned int intr_flags = ONENAND_INT_MASTER;
 122
 123                 switch (state) {
 124                 case FL_RESETING:
 125                         intr_flags |= ONENAND_INT_RESET;
 126                         break;
 127                 case FL_PREPARING_ERASE:
 128                         intr_flags |= ONENAND_INT_ERASE;
 129                         break;
 130                 case FL_VERIFYING_ERASE:
 131                         i = 101;
 132                         break;
 133                 }
 134
 135                 while (--i) {
 136                         udelay(1);
 137                         intr = read_reg(c, ONENAND_REG_INTERRUPT);
 138                         if (intr & ONENAND_INT_MASTER)
 139                                 break;
 140                 }
 141                 ctrl = read_reg(c, ONENAND_REG_CTRL_STATUS);
 142                 if (ctrl & ONENAND_CTRL_ERROR) {
 143                         wait_err("controller error", state, ctrl, intr);
 144                         return -EIO;
 145                 }
 146                 if ((intr & intr_flags) == intr_flags)
 147                         return 0;
 148                 /* Continue in wait for interrupt branch */
 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                                     !this->ongoing) {
 185                                         /*
 186                                          * The operation seems to be still going
 187                                          * so give it some more time.
 188                                          */
 189                                         retry_cnt += 1;
 190                                         if (retry_cnt < 3)
 191                                                 goto retry;
 192                                         intr = read_reg(c,
 193                                                         ONENAND_REG_INTERRUPT);
 194                                         wait_err("timeout", state, ctrl, intr);
 195                                         return -EIO;
 196                                 }
 197                                 intr = read_reg(c, ONENAND_REG_INTERRUPT);
 198                                 if ((intr & ONENAND_INT_MASTER) == 0)
 199                                         wait_warn("timeout", state, ctrl, intr);
 200                         }
 201                 }
 202         } else {
 203                 int retry_cnt = 0;
 204
 205                 /* Turn interrupts off */
 206                 syscfg = read_reg(c, ONENAND_REG_SYS_CFG1);
 207                 syscfg &= ~ONENAND_SYS_CFG1_IOBE;
 208                 write_reg(c, syscfg, ONENAND_REG_SYS_CFG1);
 209
 210                 timeout = jiffies + msecs_to_jiffies(20);
 211                 while (1) {
 212                         if (time_before(jiffies, timeout)) {
 213                                 intr = read_reg(c, ONENAND_REG_INTERRUPT);
 214                                 if (intr & ONENAND_INT_MASTER)
 215                                         break;
 216                         } else {
 217                                 /* Timeout after 20ms */
 218                                 ctrl = read_reg(c, ONENAND_REG_CTRL_STATUS);
 219                                 if (ctrl & ONENAND_CTRL_ONGO) {
 220                                         /*
 221                                          * The operation seems to be still going
 222                                          * so give it some more time.
 223                                          */
 224                                         retry_cnt += 1;
 225                                         if (retry_cnt < 3) {
 226                                                 timeout = jiffies +
 227                                                           msecs_to_jiffies(20);
 228                                                 continue;
 229                                         }
 230                                 }
 231                                 break;
 232                         }
 233                 }
 234         }
 235
 236         intr = read_reg(c, ONENAND_REG_INTERRUPT);
 237         ctrl = read_reg(c, ONENAND_REG_CTRL_STATUS);
 238
 239         if (intr & ONENAND_INT_READ) {
 240                 int ecc = read_reg(c, ONENAND_REG_ECC_STATUS);
 241
 242                 if (ecc) {
 243                         unsigned int addr1, addr8;
 244
 245                         addr1 = read_reg(c, ONENAND_REG_START_ADDRESS1);
 246                         addr8 = read_reg(c, ONENAND_REG_START_ADDRESS8);
 247                         if (ecc & ONENAND_ECC_2BIT_ALL) {
 248                                 printk(KERN_ERR "onenand_wait: ECC error = "
 249                                        "0x%04x, addr1 %#x, addr8 %#x\n",
 250                                        ecc, addr1, addr8);
 251                                 mtd->ecc_stats.failed++;
 252                                 return -EBADMSG;
 253                         } else if (ecc & ONENAND_ECC_1BIT_ALL) {
 254                                 printk(KERN_NOTICE "onenand_wait: correctable "
 255                                        "ECC error = 0x%04x, addr1 %#x, "
 256                                        "addr8 %#x\n", ecc, addr1, addr8);
 257                                 mtd->ecc_stats.corrected++;
 258                         }
 259                 }
 260         } else if (state == FL_READING) {
 261                 wait_err("timeout", state, ctrl, intr);
 262                 return -EIO;
 263         }
 264
 265         if (ctrl & ONENAND_CTRL_ERROR) {
 266                 wait_err("controller error", state, ctrl, intr);
 267                 if (ctrl & ONENAND_CTRL_LOCK)
 268                         printk(KERN_ERR "onenand_wait: "
 269                                         "Device is write protected!!!\n");
 270                 return -EIO;
 271         }
 272
 273         ctrl_mask = 0xFE9F;
 274         if (this->ongoing)
 275                 ctrl_mask &= ~0x8000;
 276
 277         if (ctrl & ctrl_mask)
 278                 wait_warn("unexpected controller status", state, ctrl, intr);
 279
 280         return 0;
 281 }
 282
 283 static inline int omap2_onenand_bufferram_offset(struct mtd_info *mtd, int area)
 284 {
 285         struct onenand_chip *this = mtd->priv;
 286
 287         if (ONENAND_CURRENT_BUFFERRAM(this)) {
 288                 if (area == ONENAND_DATARAM)
 289                         return this->writesize;
 290                 if (area == ONENAND_SPARERAM)
 291                         return mtd->oobsize;
 292         }
 293
 294         return 0;
 295 }
 296
 297 #if defined(CONFIG_ARCH_OMAP3) || defined(MULTI_OMAP2)
 298
 299 static int omap3_onenand_read_bufferram(struct mtd_info *mtd, int area,
 300                                         unsigned char *buffer, int offset,
 301                                         size_t count)
 302 {
 303         struct omap2_onenand *c = container_of(mtd, struct omap2_onenand, mtd);
 304         struct onenand_chip *this = mtd->priv;
 305         dma_addr_t dma_src, dma_dst;
 306         int bram_offset;
 307         unsigned long timeout;
 308         void *buf = (void *)buffer;
 309         size_t xtra;
 310         volatile unsigned *done;
 311
 312         bram_offset = omap2_onenand_bufferram_offset(mtd, area) + area + offset;
 313         if (bram_offset & 3 || (size_t)buf & 3 || count < 384)
 314                 goto out_copy;
 315
 316         /* panic_write() may be in an interrupt context */
 317         if (in_interrupt() || oops_in_progress)
 318                 goto out_copy;
 319
 320         if (buf >= high_memory) {
 321                 struct page *p1;
 322
 323                 if (((size_t)buf & PAGE_MASK) !=
 324                     ((size_t)(buf + count - 1) & PAGE_MASK))
 325                         goto out_copy;
 326                 p1 = vmalloc_to_page(buf);
 327                 if (!p1)
 328                         goto out_copy;
 329                 buf = page_address(p1) + ((size_t)buf & ~PAGE_MASK);
 330         }
 331
 332         xtra = count & 3;
 333         if (xtra) {
 334                 count -= xtra;
 335                 memcpy(buf + count, this->base + bram_offset + count, xtra);
 336         }
 337
 338         dma_src = c->phys_base + bram_offset;
 339         dma_dst = dma_map_single(&c->pdev->dev, buf, count, DMA_FROM_DEVICE);
 340         if (dma_mapping_error(&c->pdev->dev, dma_dst)) {
 341                 dev_err(&c->pdev->dev,
 342                         "Couldn't DMA map a %d byte buffer\n",
 343                         count);
 344                 goto out_copy;
 345         }
 346
 347         omap_set_dma_transfer_params(c->dma_channel, OMAP_DMA_DATA_TYPE_S32,
 348                                      count >> 2, 1, 0, 0, 0);
 349         omap_set_dma_src_params(c->dma_channel, 0, OMAP_DMA_AMODE_POST_INC,
 350                                 dma_src, 0, 0);
 351         omap_set_dma_dest_params(c->dma_channel, 0, OMAP_DMA_AMODE_POST_INC,
 352                                  dma_dst, 0, 0);
 353
 354         INIT_COMPLETION(c->dma_done);
 355         omap_start_dma(c->dma_channel);
 356
 357         timeout = jiffies + msecs_to_jiffies(20);
 358         done = &c->dma_done.done;
 359         while (time_before(jiffies, timeout))
 360                 if (*done)
 361                         break;
 362
 363         dma_unmap_single(&c->pdev->dev, dma_dst, count, DMA_FROM_DEVICE);
 364
 365         if (!*done) {
 366                 dev_err(&c->pdev->dev, "timeout waiting for DMA\n");
 367                 goto out_copy;
 368         }
 369
 370         return 0;
 371
 372 out_copy:
 373         memcpy(buf, this->base + bram_offset, count);
 374         return 0;
 375 }
 376
 377 static int omap3_onenand_write_bufferram(struct mtd_info *mtd, int area,
 378                                          const unsigned char *buffer,
 379                                          int offset, size_t count)
 380 {
 381         struct omap2_onenand *c = container_of(mtd, struct omap2_onenand, mtd);
 382         struct onenand_chip *this = mtd->priv;
 383         dma_addr_t dma_src, dma_dst;
 384         int bram_offset;
 385         unsigned long timeout;
 386         void *buf = (void *)buffer;
 387         volatile unsigned *done;
 388
 389         bram_offset = omap2_onenand_bufferram_offset(mtd, area) + area + offset;
 390         if (bram_offset & 3 || (size_t)buf & 3 || count < 384)
 391                 goto out_copy;
 392
 393         /* panic_write() may be in an interrupt context */
 394         if (in_interrupt() || oops_in_progress)
 395                 goto out_copy;
 396
 397         if (buf >= high_memory) {
 398                 struct page *p1;
 399
 400                 if (((size_t)buf & PAGE_MASK) !=
 401                     ((size_t)(buf + count - 1) & PAGE_MASK))
 402                         goto out_copy;
 403                 p1 = vmalloc_to_page(buf);
 404                 if (!p1)
 405                         goto out_copy;
 406                 buf = page_address(p1) + ((size_t)buf & ~PAGE_MASK);
 407         }
 408
 409         dma_src = dma_map_single(&c->pdev->dev, buf, count, DMA_TO_DEVICE);
 410         dma_dst = c->phys_base + bram_offset;
 411         if (dma_mapping_error(&c->pdev->dev, dma_src)) {
 412                 dev_err(&c->pdev->dev,
 413                         "Couldn't DMA map a %d byte buffer\n",
 414                         count);
 415                 return -1;
 416         }
 417
 418         omap_set_dma_transfer_params(c->dma_channel, OMAP_DMA_DATA_TYPE_S32,
 419                                      count >> 2, 1, 0, 0, 0);
 420         omap_set_dma_src_params(c->dma_channel, 0, OMAP_DMA_AMODE_POST_INC,
 421                                 dma_src, 0, 0);
 422         omap_set_dma_dest_params(c->dma_channel, 0, OMAP_DMA_AMODE_POST_INC,
 423                                  dma_dst, 0, 0);
 424
 425         INIT_COMPLETION(c->dma_done);
 426         omap_start_dma(c->dma_channel);
 427
 428         timeout = jiffies + msecs_to_jiffies(20);
 429         done = &c->dma_done.done;
 430         while (time_before(jiffies, timeout))
 431                 if (*done)
 432                         break;
 433
 434         dma_unmap_single(&c->pdev->dev, dma_src, count, DMA_TO_DEVICE);
 435
 436         if (!*done) {
 437                 dev_err(&c->pdev->dev, "timeout waiting for DMA\n");
 438                 goto out_copy;
 439         }
 440
 441         return 0;
 442
 443 out_copy:
 444         memcpy(this->base + bram_offset, buf, count);
 445         return 0;
 446 }
 447
 448 #else
 449
 450 int omap3_onenand_read_bufferram(struct mtd_info *mtd, int area,
 451                                  unsigned char *buffer, int offset,
 452                                  size_t count);
 453
 454 int omap3_onenand_write_bufferram(struct mtd_info *mtd, int area,
 455                                   const unsigned char *buffer,
 456                                   int offset, size_t count);
 457
 458 #endif
 459
 460 #if defined(CONFIG_ARCH_OMAP2) || defined(MULTI_OMAP2)
 461
 462 static int omap2_onenand_read_bufferram(struct mtd_info *mtd, int area,
 463                                         unsigned char *buffer, int offset,
 464                                         size_t count)
 465 {
 466         struct omap2_onenand *c = container_of(mtd, struct omap2_onenand, mtd);
 467         struct onenand_chip *this = mtd->priv;
 468         dma_addr_t dma_src, dma_dst;
 469         int bram_offset;
 470
 471         bram_offset = omap2_onenand_bufferram_offset(mtd, area) + area + offset;
 472         /* DMA is not used.  Revisit PM requirements before enabling it. */
 473         if (1 || (c->dma_channel < 0) ||
 474             ((void *) buffer >= (void *) high_memory) || (bram_offset & 3) ||
 475             (((unsigned int) buffer) & 3) || (count < 1024) || (count & 3)) {
 476                 memcpy(buffer, (__force void *)(this->base + bram_offset),
 477                        count);
 478                 return 0;
 479         }
 480
 481         dma_src = c->phys_base + bram_offset;
 482         dma_dst = dma_map_single(&c->pdev->dev, buffer, count,
 483                                  DMA_FROM_DEVICE);
 484         if (dma_mapping_error(&c->pdev->dev, dma_dst)) {
 485                 dev_err(&c->pdev->dev,
 486                         "Couldn't DMA map a %d byte buffer\n",
 487                         count);
 488                 return -1;
 489         }
 490
 491         omap_set_dma_transfer_params(c->dma_channel, OMAP_DMA_DATA_TYPE_S32,
 492                                      count / 4, 1, 0, 0, 0);
 493         omap_set_dma_src_params(c->dma_channel, 0, OMAP_DMA_AMODE_POST_INC,
 494                                 dma_src, 0, 0);
 495         omap_set_dma_dest_params(c->dma_channel, 0, OMAP_DMA_AMODE_POST_INC,
 496                                  dma_dst, 0, 0);
 497
 498         INIT_COMPLETION(c->dma_done);
 499         omap_start_dma(c->dma_channel);
 500         wait_for_completion(&c->dma_done);
 501
 502         dma_unmap_single(&c->pdev->dev, dma_dst, count, DMA_FROM_DEVICE);
 503
 504         return 0;
 505 }
 506
 507 static int omap2_onenand_write_bufferram(struct mtd_info *mtd, int area,
 508                                          const unsigned char *buffer,
 509                                          int offset, size_t count)
 510 {
 511         struct omap2_onenand *c = container_of(mtd, struct omap2_onenand, mtd);
 512         struct onenand_chip *this = mtd->priv;
 513         dma_addr_t dma_src, dma_dst;
 514         int bram_offset;
 515
 516         bram_offset = omap2_onenand_bufferram_offset(mtd, area) + area + offset;
 517         /* DMA is not used.  Revisit PM requirements before enabling it. */
 518         if (1 || (c->dma_channel < 0) ||
 519             ((void *) buffer >= (void *) high_memory) || (bram_offset & 3) ||
 520             (((unsigned int) buffer) & 3) || (count < 1024) || (count & 3)) {
 521                 memcpy((__force void *)(this->base + bram_offset), buffer,
 522                        count);
 523                 return 0;
 524         }
 525
 526         dma_src = dma_map_single(&c->pdev->dev, (void *) buffer, count,
 527                                  DMA_TO_DEVICE);
 528         dma_dst = c->phys_base + bram_offset;
 529         if (dma_mapping_error(&c->pdev->dev, dma_src)) {
 530                 dev_err(&c->pdev->dev,
 531                         "Couldn't DMA map a %d byte buffer\n",
 532                         count);
 533                 return -1;
 534         }
 535
 536         omap_set_dma_transfer_params(c->dma_channel, OMAP_DMA_DATA_TYPE_S16,
 537                                      count / 2, 1, 0, 0, 0);
 538         omap_set_dma_src_params(c->dma_channel, 0, OMAP_DMA_AMODE_POST_INC,
 539                                 dma_src, 0, 0);
 540         omap_set_dma_dest_params(c->dma_channel, 0, OMAP_DMA_AMODE_POST_INC,
 541                                  dma_dst, 0, 0);
 542
 543         INIT_COMPLETION(c->dma_done);
 544         omap_start_dma(c->dma_channel);
 545         wait_for_completion(&c->dma_done);
 546
 547         dma_unmap_single(&c->pdev->dev, dma_src, count, DMA_TO_DEVICE);
 548
 549         return 0;
 550 }
 551
 552 #else
 553
 554 int omap2_onenand_read_bufferram(struct mtd_info *mtd, int area,
 555                                  unsigned char *buffer, int offset,
 556                                  size_t count);
 557
 558 int omap2_onenand_write_bufferram(struct mtd_info *mtd, int area,
 559                                   const unsigned char *buffer,
 560                                   int offset, size_t count);
 561
 562 #endif
 563
 564 static struct platform_driver omap2_onenand_driver;
 565
 566 static int __adjust_timing(struct device *dev, void *data)
 567 {
 568         int ret = 0;
 569         struct omap2_onenand *c;
 570
 571         c = dev_get_drvdata(dev);
 572
 573         BUG_ON(c->setup == NULL);
 574
 575         /* DMA is not in use so this is all that is needed */
 576         /* Revisit for OMAP3! */
 577         ret = c->setup(c->onenand.base, &c->freq);
 578
 579         return ret;
 580 }
 581
 582 int omap2_onenand_rephase(void)
 583 {
 584         return driver_for_each_device(&omap2_onenand_driver.driver, NULL,
 585                                       NULL, __adjust_timing);
 586 }
 587
 588 static void omap2_onenand_shutdown(struct platform_device *pdev)
 589 {
 590         struct omap2_onenand *c = dev_get_drvdata(&pdev->dev);
 591
 592         /* With certain content in the buffer RAM, the OMAP boot ROM code
 593          * can recognize the flash chip incorrectly. Zero it out before
 594          * soft reset.
 595          */
 596         memset((__force void *)c->onenand.base, 0, ONENAND_BUFRAM_SIZE);
 597 }
 598
 599 static int omap2_onenand_enable(struct mtd_info *mtd)
 600 {
 601         int ret;
 602         struct omap2_onenand *c = container_of(mtd, struct omap2_onenand, mtd);
 603
 604         ret = regulator_enable(c->regulator);
 605         if (ret != 0)
 606                 dev_err(&c->pdev->dev, "can't enable regulator\n");
 607
 608         return ret;
 609 }
 610
 611 static int omap2_onenand_disable(struct mtd_info *mtd)
 612 {
 613         int ret;
 614         struct omap2_onenand *c = container_of(mtd, struct omap2_onenand, mtd);
 615
 616         ret = regulator_disable(c->regulator);
 617         if (ret != 0)
 618                 dev_err(&c->pdev->dev, "can't disable regulator\n");
 619
 620         return ret;
 621 }
 622
 623 static int __devinit omap2_onenand_probe(struct platform_device *pdev)
 624 {
 625         struct omap_onenand_platform_data *pdata;
 626         struct omap2_onenand *c;
 627         struct onenand_chip *this;
 628         int r;
 629
 630         pdata = pdev->dev.platform_data;
 631         if (pdata == NULL) {
 632                 dev_err(&pdev->dev, "platform data missing\n");
 633                 return -ENODEV;
 634         }
 635
 636         c = kzalloc(sizeof(struct omap2_onenand), GFP_KERNEL);
 637         if (!c)
 638                 return -ENOMEM;
 639
 640         init_completion(&c->irq_done);
 641         init_completion(&c->dma_done);
 642         c->gpmc_cs = pdata->cs;
 643         c->gpio_irq = pdata->gpio_irq;
 644         c->dma_channel = pdata->dma_channel;
 645         if (c->dma_channel < 0) {
 646                 /* if -1, don't use DMA */
 647                 c->gpio_irq = 0;
 648         }
 649
 650         r = gpmc_cs_request(c->gpmc_cs, ONENAND_IO_SIZE, &c->phys_base);
 651         if (r < 0) {
 652                 dev_err(&pdev->dev, "Cannot request GPMC CS\n");
 653                 goto err_kfree;
 654         }
 655
 656         if (request_mem_region(c->phys_base, ONENAND_IO_SIZE,
 657                                pdev->dev.driver->name) == NULL) {
 658                 dev_err(&pdev->dev, "Cannot reserve memory region at 0x%08lx, "
 659                         "size: 0x%x\n", c->phys_base, ONENAND_IO_SIZE);
 660                 r = -EBUSY;
 661                 goto err_free_cs;
 662         }
 663         c->onenand.base = ioremap(c->phys_base, ONENAND_IO_SIZE);
 664         if (c->onenand.base == NULL) {
 665                 r = -ENOMEM;
 666                 goto err_release_mem_region;
 667         }
 668
 669         if (pdata->onenand_setup != NULL) {
 670                 r = pdata->onenand_setup(c->onenand.base, &c->freq);
 671                 if (r < 0) {
 672                         dev_err(&pdev->dev, "Onenand platform setup failed: "
 673                                 "%d\n", r);
 674                         goto err_iounmap;
 675                 }
 676                 c->setup = pdata->onenand_setup;
 677         }
 678
 679         if (c->gpio_irq) {
 680                 if ((r = gpio_request(c->gpio_irq, "OneNAND irq")) < 0) {
 681                         dev_err(&pdev->dev,  "Failed to request GPIO%d for "
 682                                 "OneNAND\n", c->gpio_irq);
 683                         goto err_iounmap;
 684         }
 685         gpio_direction_input(c->gpio_irq);
 686
 687         if ((r = request_irq(gpio_to_irq(c->gpio_irq),
 688                              omap2_onenand_interrupt, IRQF_TRIGGER_RISING,
 689                              pdev->dev.driver->name, c)) < 0)
 690                 goto err_release_gpio;
 691         }
 692
 693         if (c->dma_channel >= 0) {
 694                 r = omap_request_dma(0, pdev->dev.driver->name,
 695                                      omap2_onenand_dma_cb, (void *) c,
 696                                      &c->dma_channel);
 697                 if (r == 0) {
 698                         omap_set_dma_write_mode(c->dma_channel,
 699                                                 OMAP_DMA_WRITE_NON_POSTED);
 700                         omap_set_dma_src_data_pack(c->dma_channel, 1);
 701                         omap_set_dma_src_burst_mode(c->dma_channel,
 702                                                     OMAP_DMA_DATA_BURST_8);
 703                         omap_set_dma_dest_data_pack(c->dma_channel, 1);
 704                         omap_set_dma_dest_burst_mode(c->dma_channel,
 705                                                      OMAP_DMA_DATA_BURST_8);
 706                 } else {
 707                         dev_info(&pdev->dev,
 708                                  "failed to allocate DMA for OneNAND, "
 709                                  "using PIO instead\n");
 710                         c->dma_channel = -1;
 711                 }
 712         }
 713
 714         dev_info(&pdev->dev, "initializing on CS%d, phys base 0x%08lx, virtual "
 715                  "base %p, freq %d MHz\n", c->gpmc_cs, c->phys_base,
 716                  c->onenand.base, c->freq);
 717
 718         c->pdev = pdev;
 719         c->mtd.name = dev_name(&pdev->dev);
 720         c->mtd.priv = &c->onenand;
 721         c->mtd.owner = THIS_MODULE;
 722
 723         c->mtd.dev.parent = &pdev->dev;
 724
 725         this = &c->onenand;
 726         if (c->dma_channel >= 0) {
 727                 this->wait = omap2_onenand_wait;
 728                 if (cpu_is_omap34xx()) {
 729                         this->read_bufferram = omap3_onenand_read_bufferram;
 730                         this->write_bufferram = omap3_onenand_write_bufferram;
 731                 } else {
 732                         this->read_bufferram = omap2_onenand_read_bufferram;
 733                         this->write_bufferram = omap2_onenand_write_bufferram;
 734                 }
 735         }
 736
 737         if (pdata->regulator_can_sleep) {
 738                 c->regulator = regulator_get(&pdev->dev, "vonenand");
 739                 if (IS_ERR(c->regulator)) {
 740                         dev_err(&pdev->dev,  "Failed to get regulator\n");
 741                         r = PTR_ERR(c->regulator);
 742                         goto err_release_dma;
 743                 }
 744                 c->onenand.enable = omap2_onenand_enable;
 745                 c->onenand.disable = omap2_onenand_disable;
 746         }
 747
 748         if (pdata->skip_initial_unlocking)
 749                 this->options |= ONENAND_SKIP_INITIAL_UNLOCKING;
 750
 751         if ((r = onenand_scan(&c->mtd, 1)) < 0)
 752                 goto err_release_regulator;
 753
 754         r = mtd_device_parse_register(&c->mtd, NULL, 0,
 755                         pdata ? pdata->parts : NULL,
 756                         pdata ? pdata->nr_parts : 0);
 757         if (r)
 758                 goto err_release_onenand;
 759
 760         platform_set_drvdata(pdev, c);
 761
 762         return 0;
 763
 764 err_release_onenand:
 765         onenand_release(&c->mtd);
 766 err_release_regulator:
 767         regulator_put(c->regulator);
 768 err_release_dma:
 769         if (c->dma_channel != -1)
 770                 omap_free_dma(c->dma_channel);
 771         if (c->gpio_irq)
 772                 free_irq(gpio_to_irq(c->gpio_irq), c);
 773 err_release_gpio:
 774         if (c->gpio_irq)
 775                 gpio_free(c->gpio_irq);
 776 err_iounmap:
 777         iounmap(c->onenand.base);
 778 err_release_mem_region:
 779         release_mem_region(c->phys_base, ONENAND_IO_SIZE);
 780 err_free_cs:
 781         gpmc_cs_free(c->gpmc_cs);
 782 err_kfree:
 783         kfree(c);
 784
 785         return r;
 786 }
 787
 788 static int __devexit omap2_onenand_remove(struct platform_device *pdev)
 789 {
 790         struct omap2_onenand *c = dev_get_drvdata(&pdev->dev);
 791
 792         onenand_release(&c->mtd);
 793         regulator_put(c->regulator);
 794         if (c->dma_channel != -1)
 795                 omap_free_dma(c->dma_channel);
 796         omap2_onenand_shutdown(pdev);
 797         platform_set_drvdata(pdev, NULL);
 798         if (c->gpio_irq) {
 799                 free_irq(gpio_to_irq(c->gpio_irq), c);
 800                 gpio_free(c->gpio_irq);
 801         }
 802         iounmap(c->onenand.base);
 803         release_mem_region(c->phys_base, ONENAND_IO_SIZE);
 804         gpmc_cs_free(c->gpmc_cs);
 805         kfree(c);
 806
 807         return 0;
 808 }
 809
 810 static struct platform_driver omap2_onenand_driver = {
 811         .probe          = omap2_onenand_probe,
 812         .remove         = __devexit_p(omap2_onenand_remove),
 813         .shutdown       = omap2_onenand_shutdown,
 814         .driver         = {
 815                 .name   = DRIVER_NAME,
 816                 .owner  = THIS_MODULE,
 817         },
 818 };
 819
 820 static int __init omap2_onenand_init(void)
 821 {
 822         printk(KERN_INFO "OneNAND driver initializing\n");
 823         return platform_driver_register(&omap2_onenand_driver);
 824 }
 825
 826 static void __exit omap2_onenand_exit(void)
 827 {
 828         platform_driver_unregister(&omap2_onenand_driver);
 829 }
 830
 831 module_init(omap2_onenand_init);
 832 module_exit(omap2_onenand_exit);
 833
 834 MODULE_ALIAS("platform:" DRIVER_NAME);
 835 MODULE_LICENSE("GPL");
 836 MODULE_AUTHOR("Jarkko Lavinen <jarkko.lavinen@nokia.com>");
 837 MODULE_DESCRIPTION("Glue layer for OneNAND flash on OMAP2 / OMAP3");