drivers/mtd/nand/onenand/omap2.c

   1 /*
   2  *  OneNAND driver for OMAP2 / OMAP3
   3  *
   4  *  Copyright © 2005-2006 Nokia Corporation
   5  *
   6  *  Author: Jarkko Lavinen <jarkko.lavinen@nokia.com> and Juha Yrjölä
   7  *  IRQ and DMA support written by Timo Teras
   8  *
   9  * This program is free software; you can redistribute it and/or modify it
  10  * under the terms of the GNU General Public License version 2 as published by
  11  * the Free Software Foundation.
  12  *
  13  * This program is distributed in the hope that it will be useful, but WITHOUT
  14  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  15  * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
  16  * more details.
  17  *
  18  * You should have received a copy of the GNU General Public License along with
  19  * this program; see the file COPYING. If not, write to the Free Software
  20  * Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  21  *
  22  */
  23
  24 #include <linux/device.h>
  25 #include <linux/module.h>
  26 #include <linux/mtd/mtd.h>
  27 #include <linux/mtd/onenand.h>
  28 #include <linux/mtd/partitions.h>
  29 #include <linux/of_device.h>
  30 #include <linux/omap-gpmc.h>
  31 #include <linux/platform_device.h>
  32 #include <linux/interrupt.h>
  33 #include <linux/delay.h>
  34 #include <linux/dma-mapping.h>
  35 #include <linux/dmaengine.h>
  36 #include <linux/io.h>
  37 #include <linux/slab.h>
  38 #include <linux/gpio/consumer.h>
  39
  40 #include <asm/mach/flash.h>
  41
  42 #define DRIVER_NAME "omap2-onenand"
  43
  44 #define ONENAND_BUFRAM_SIZE     (1024 * 5)
  45
  46 struct omap2_onenand {
  47         struct platform_device *pdev;
  48         int gpmc_cs;
  49         unsigned long phys_base;
  50         struct gpio_desc *int_gpiod;
  51         struct mtd_info mtd;
  52         struct onenand_chip onenand;
  53         struct completion irq_done;
  54         struct completion dma_done;
  55         struct dma_chan *dma_chan;
  56 };
  57
  58 static void omap2_onenand_dma_complete_func(void *completion)
  59 {
  60         complete(completion);
  61 }
  62
  63 static irqreturn_t omap2_onenand_interrupt(int irq, void *dev_id)
  64 {
  65         struct omap2_onenand *c = dev_id;
  66
  67         complete(&c->irq_done);
  68
  69         return IRQ_HANDLED;
  70 }
  71
  72 static inline unsigned short read_reg(struct omap2_onenand *c, int reg)
  73 {
  74         return readw(c->onenand.base + reg);
  75 }
  76
  77 static inline void write_reg(struct omap2_onenand *c, unsigned short value,
  78                              int reg)
  79 {
  80         writew(value, c->onenand.base + reg);
  81 }
  82
  83 static int omap2_onenand_set_cfg(struct omap2_onenand *c,
  84                                  bool sr, bool sw,
  85                                  int latency, int burst_len)
  86 {
  87         unsigned short reg = ONENAND_SYS_CFG1_RDY | ONENAND_SYS_CFG1_INT;
  88
  89         reg |= latency << ONENAND_SYS_CFG1_BRL_SHIFT;
  90
  91         switch (burst_len) {
  92         case 0:         /* continuous */
  93                 break;
  94         case 4:
  95                 reg |= ONENAND_SYS_CFG1_BL_4;
  96                 break;
  97         case 8:
  98                 reg |= ONENAND_SYS_CFG1_BL_8;
  99                 break;
 100         case 16:
 101                 reg |= ONENAND_SYS_CFG1_BL_16;
 102                 break;
 103         case 32:
 104                 reg |= ONENAND_SYS_CFG1_BL_32;
 105                 break;
 106         default:
 107                 return -EINVAL;
 108         }
 109
 110         if (latency > 5)
 111                 reg |= ONENAND_SYS_CFG1_HF;
 112         if (latency > 7)
 113                 reg |= ONENAND_SYS_CFG1_VHF;
 114         if (sr)
 115                 reg |= ONENAND_SYS_CFG1_SYNC_READ;
 116         if (sw)
 117                 reg |= ONENAND_SYS_CFG1_SYNC_WRITE;
 118
 119         write_reg(c, reg, ONENAND_REG_SYS_CFG1);
 120
 121         return 0;
 122 }
 123
 124 static int omap2_onenand_get_freq(int ver)
 125 {
 126         switch ((ver >> 4) & 0xf) {
 127         case 0:
 128                 return 40;
 129         case 1:
 130                 return 54;
 131         case 2:
 132                 return 66;
 133         case 3:
 134                 return 83;
 135         case 4:
 136                 return 104;
 137         }
 138
 139         return -EINVAL;
 140 }
 141
 142 static void wait_err(char *msg, int state, unsigned int ctrl, unsigned int intr)
 143 {
 144         printk(KERN_ERR "onenand_wait: %s! state %d ctrl 0x%04x intr 0x%04x\n",
 145                msg, state, ctrl, intr);
 146 }
 147
 148 static void wait_warn(char *msg, int state, unsigned int ctrl,
 149                       unsigned int intr)
 150 {
 151         printk(KERN_WARNING "onenand_wait: %s! state %d ctrl 0x%04x "
 152                "intr 0x%04x\n", msg, state, ctrl, intr);
 153 }
 154
 155 static int omap2_onenand_wait(struct mtd_info *mtd, int state)
 156 {
 157         struct omap2_onenand *c = container_of(mtd, struct omap2_onenand, mtd);
 158         struct onenand_chip *this = mtd->priv;
 159         unsigned int intr = 0;
 160         unsigned int ctrl, ctrl_mask;
 161         unsigned long timeout;
 162         u32 syscfg;
 163
 164         if (state == FL_RESETING || state == FL_PREPARING_ERASE ||
 165             state == FL_VERIFYING_ERASE) {
 166                 int i = 21;
 167                 unsigned int intr_flags = ONENAND_INT_MASTER;
 168
 169                 switch (state) {
 170                 case FL_RESETING:
 171                         intr_flags |= ONENAND_INT_RESET;
 172                         break;
 173                 case FL_PREPARING_ERASE:
 174                         intr_flags |= ONENAND_INT_ERASE;
 175                         break;
 176                 case FL_VERIFYING_ERASE:
 177                         i = 101;
 178                         break;
 179                 }
 180
 181                 while (--i) {
 182                         udelay(1);
 183                         intr = read_reg(c, ONENAND_REG_INTERRUPT);
 184                         if (intr & ONENAND_INT_MASTER)
 185                                 break;
 186                 }
 187                 ctrl = read_reg(c, ONENAND_REG_CTRL_STATUS);
 188                 if (ctrl & ONENAND_CTRL_ERROR) {
 189                         wait_err("controller error", state, ctrl, intr);
 190                         return -EIO;
 191                 }
 192                 if ((intr & intr_flags) == intr_flags)
 193                         return 0;
 194                 /* Continue in wait for interrupt branch */
 195         }
 196
 197         if (state != FL_READING) {
 198                 int result;
 199
 200                 /* Turn interrupts on */
 201                 syscfg = read_reg(c, ONENAND_REG_SYS_CFG1);
 202                 if (!(syscfg & ONENAND_SYS_CFG1_IOBE)) {
 203                         syscfg |= ONENAND_SYS_CFG1_IOBE;
 204                         write_reg(c, syscfg, ONENAND_REG_SYS_CFG1);
 205                         /* Add a delay to let GPIO settle */
 206                         syscfg = read_reg(c, ONENAND_REG_SYS_CFG1);
 207                 }
 208
 209                 reinit_completion(&c->irq_done);
 210                 result = gpiod_get_value(c->int_gpiod);
 211                 if (result < 0) {
 212                         ctrl = read_reg(c, ONENAND_REG_CTRL_STATUS);
 213                         intr = read_reg(c, ONENAND_REG_INTERRUPT);
 214                         wait_err("gpio error", state, ctrl, intr);
 215                         return result;
 216                 } else if (result == 0) {
 217                         int retry_cnt = 0;
 218 retry:
 219                         if (!wait_for_completion_io_timeout(&c->irq_done,
 220                                                 msecs_to_jiffies(20))) {
 221                                 /* Timeout after 20ms */
 222                                 ctrl = read_reg(c, ONENAND_REG_CTRL_STATUS);
 223                                 if (ctrl & ONENAND_CTRL_ONGO &&
 224                                     !this->ongoing) {
 225                                         /*
 226                                          * The operation seems to be still going
 227                                          * so give it some more time.
 228                                          */
 229                                         retry_cnt += 1;
 230                                         if (retry_cnt < 3)
 231                                                 goto retry;
 232                                         intr = read_reg(c,
 233                                                         ONENAND_REG_INTERRUPT);
 234                                         wait_err("timeout", state, ctrl, intr);
 235                                         return -EIO;
 236                                 }
 237                                 intr = read_reg(c, ONENAND_REG_INTERRUPT);
 238                                 if ((intr & ONENAND_INT_MASTER) == 0)
 239                                         wait_warn("timeout", state, ctrl, intr);
 240                         }
 241                 }
 242         } else {
 243                 int retry_cnt = 0;
 244
 245                 /* Turn interrupts off */
 246                 syscfg = read_reg(c, ONENAND_REG_SYS_CFG1);
 247                 syscfg &= ~ONENAND_SYS_CFG1_IOBE;
 248                 write_reg(c, syscfg, ONENAND_REG_SYS_CFG1);
 249
 250                 timeout = jiffies + msecs_to_jiffies(20);
 251                 while (1) {
 252                         if (time_before(jiffies, timeout)) {
 253                                 intr = read_reg(c, ONENAND_REG_INTERRUPT);
 254                                 if (intr & ONENAND_INT_MASTER)
 255                                         break;
 256                         } else {
 257                                 /* Timeout after 20ms */
 258                                 ctrl = read_reg(c, ONENAND_REG_CTRL_STATUS);
 259                                 if (ctrl & ONENAND_CTRL_ONGO) {
 260                                         /*
 261                                          * The operation seems to be still going
 262                                          * so give it some more time.
 263                                          */
 264                                         retry_cnt += 1;
 265                                         if (retry_cnt < 3) {
 266                                                 timeout = jiffies +
 267                                                           msecs_to_jiffies(20);
 268                                                 continue;
 269                                         }
 270                                 }
 271                                 break;
 272                         }
 273                 }
 274         }
 275
 276         intr = read_reg(c, ONENAND_REG_INTERRUPT);
 277         ctrl = read_reg(c, ONENAND_REG_CTRL_STATUS);
 278
 279         if (intr & ONENAND_INT_READ) {
 280                 int ecc = read_reg(c, ONENAND_REG_ECC_STATUS);
 281
 282                 if (ecc) {
 283                         unsigned int addr1, addr8;
 284
 285                         addr1 = read_reg(c, ONENAND_REG_START_ADDRESS1);
 286                         addr8 = read_reg(c, ONENAND_REG_START_ADDRESS8);
 287                         if (ecc & ONENAND_ECC_2BIT_ALL) {
 288                                 printk(KERN_ERR "onenand_wait: ECC error = "
 289                                        "0x%04x, addr1 %#x, addr8 %#x\n",
 290                                        ecc, addr1, addr8);
 291                                 mtd->ecc_stats.failed++;
 292                                 return -EBADMSG;
 293                         } else if (ecc & ONENAND_ECC_1BIT_ALL) {
 294                                 printk(KERN_NOTICE "onenand_wait: correctable "
 295                                        "ECC error = 0x%04x, addr1 %#x, "
 296                                        "addr8 %#x\n", ecc, addr1, addr8);
 297                                 mtd->ecc_stats.corrected++;
 298                         }
 299                 }
 300         } else if (state == FL_READING) {
 301                 wait_err("timeout", state, ctrl, intr);
 302                 return -EIO;
 303         }
 304
 305         if (ctrl & ONENAND_CTRL_ERROR) {
 306                 wait_err("controller error", state, ctrl, intr);
 307                 if (ctrl & ONENAND_CTRL_LOCK)
 308                         printk(KERN_ERR "onenand_wait: "
 309                                         "Device is write protected!!!\n");
 310                 return -EIO;
 311         }
 312
 313         ctrl_mask = 0xFE9F;
 314         if (this->ongoing)
 315                 ctrl_mask &= ~0x8000;
 316
 317         if (ctrl & ctrl_mask)
 318                 wait_warn("unexpected controller status", state, ctrl, intr);
 319
 320         return 0;
 321 }
 322
 323 static inline int omap2_onenand_bufferram_offset(struct mtd_info *mtd, int area)
 324 {
 325         struct onenand_chip *this = mtd->priv;
 326
 327         if (ONENAND_CURRENT_BUFFERRAM(this)) {
 328                 if (area == ONENAND_DATARAM)
 329                         return this->writesize;
 330                 if (area == ONENAND_SPARERAM)
 331                         return mtd->oobsize;
 332         }
 333
 334         return 0;
 335 }
 336
 337 static inline int omap2_onenand_dma_transfer(struct omap2_onenand *c,
 338                                              dma_addr_t src, dma_addr_t dst,
 339                                              size_t count)
 340 {
 341         struct dma_async_tx_descriptor *tx;
 342         dma_cookie_t cookie;
 343
 344         tx = dmaengine_prep_dma_memcpy(c->dma_chan, dst, src, count, 0);
 345         if (!tx) {
 346                 dev_err(&c->pdev->dev, "Failed to prepare DMA memcpy\n");
 347                 return -EIO;
 348         }
 349
 350         reinit_completion(&c->dma_done);
 351
 352         tx->callback = omap2_onenand_dma_complete_func;
 353         tx->callback_param = &c->dma_done;
 354
 355         cookie = tx->tx_submit(tx);
 356         if (dma_submit_error(cookie)) {
 357                 dev_err(&c->pdev->dev, "Failed to do DMA tx_submit\n");
 358                 return -EIO;
 359         }
 360
 361         dma_async_issue_pending(c->dma_chan);
 362
 363         if (!wait_for_completion_io_timeout(&c->dma_done,
 364                                             msecs_to_jiffies(20))) {
 365                 dmaengine_terminate_sync(c->dma_chan);
 366                 return -ETIMEDOUT;
 367         }
 368
 369         return 0;
 370 }
 371
 372 static int omap2_onenand_read_bufferram(struct mtd_info *mtd, int area,
 373                                         unsigned char *buffer, int offset,
 374                                         size_t count)
 375 {
 376         struct omap2_onenand *c = container_of(mtd, struct omap2_onenand, mtd);
 377         struct onenand_chip *this = mtd->priv;
 378         struct device *dev = &c->pdev->dev;
 379         void *buf = (void *)buffer;
 380         dma_addr_t dma_src, dma_dst;
 381         int bram_offset, err;
 382         size_t xtra;
 383
 384         bram_offset = omap2_onenand_bufferram_offset(mtd, area) + area + offset;
 385         /*
 386          * If the buffer address is not DMA-able, len is not long enough to make
 387          * DMA transfers profitable or panic_write() may be in an interrupt
 388          * context fallback to PIO mode.
 389          */
 390         if (!virt_addr_valid(buf) || bram_offset & 3 || (size_t)buf & 3 ||
 391             count < 384 || in_interrupt() || oops_in_progress )
 392                 goto out_copy;
 393
 394         xtra = count & 3;
 395         if (xtra) {
 396                 count -= xtra;
 397                 memcpy(buf + count, this->base + bram_offset + count, xtra);
 398         }
 399
 400         dma_dst = dma_map_single(dev, buf, count, DMA_FROM_DEVICE);
 401         dma_src = c->phys_base + bram_offset;
 402
 403         if (dma_mapping_error(dev, dma_dst)) {
 404                 dev_err(dev, "Couldn't DMA map a %d byte buffer\n", count);
 405                 goto out_copy;
 406         }
 407
 408         err = omap2_onenand_dma_transfer(c, dma_src, dma_dst, count);
 409         dma_unmap_single(dev, dma_dst, count, DMA_FROM_DEVICE);
 410         if (!err)
 411                 return 0;
 412
 413         dev_err(dev, "timeout waiting for DMA\n");
 414
 415 out_copy:
 416         memcpy(buf, this->base + bram_offset, count);
 417         return 0;
 418 }
 419
 420 static int omap2_onenand_write_bufferram(struct mtd_info *mtd, int area,
 421                                          const unsigned char *buffer,
 422                                          int offset, size_t count)
 423 {
 424         struct omap2_onenand *c = container_of(mtd, struct omap2_onenand, mtd);
 425         struct onenand_chip *this = mtd->priv;
 426         struct device *dev = &c->pdev->dev;
 427         void *buf = (void *)buffer;
 428         dma_addr_t dma_src, dma_dst;
 429         int bram_offset, err;
 430
 431         bram_offset = omap2_onenand_bufferram_offset(mtd, area) + area + offset;
 432         /*
 433          * If the buffer address is not DMA-able, len is not long enough to make
 434          * DMA transfers profitable or panic_write() may be in an interrupt
 435          * context fallback to PIO mode.
 436          */
 437         if (!virt_addr_valid(buf) || bram_offset & 3 || (size_t)buf & 3 ||
 438             count < 384 || in_interrupt() || oops_in_progress )
 439                 goto out_copy;
 440
 441         dma_src = dma_map_single(dev, buf, count, DMA_TO_DEVICE);
 442         dma_dst = c->phys_base + bram_offset;
 443         if (dma_mapping_error(dev, dma_src)) {
 444                 dev_err(dev, "Couldn't DMA map a %d byte buffer\n", count);
 445                 goto out_copy;
 446         }
 447
 448         err = omap2_onenand_dma_transfer(c, dma_src, dma_dst, count);
 449         dma_unmap_page(dev, dma_src, count, DMA_TO_DEVICE);
 450         if (!err)
 451                 return 0;
 452
 453         dev_err(dev, "timeout waiting for DMA\n");
 454
 455 out_copy:
 456         memcpy(this->base + bram_offset, buf, count);
 457         return 0;
 458 }
 459
 460 static void omap2_onenand_shutdown(struct platform_device *pdev)
 461 {
 462         struct omap2_onenand *c = dev_get_drvdata(&pdev->dev);
 463
 464         /* With certain content in the buffer RAM, the OMAP boot ROM code
 465          * can recognize the flash chip incorrectly. Zero it out before
 466          * soft reset.
 467          */
 468         memset((__force void *)c->onenand.base, 0, ONENAND_BUFRAM_SIZE);
 469 }
 470
 471 static int omap2_onenand_probe(struct platform_device *pdev)
 472 {
 473         u32 val;
 474         dma_cap_mask_t mask;
 475         int freq, latency, r;
 476         struct resource *res;
 477         struct omap2_onenand *c;
 478         struct gpmc_onenand_info info;
 479         struct device *dev = &pdev->dev;
 480         struct device_node *np = dev->of_node;
 481
 482         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 483         if (!res) {
 484                 dev_err(dev, "error getting memory resource\n");
 485                 return -EINVAL;
 486         }
 487
 488         r = of_property_read_u32(np, "reg", &val);
 489         if (r) {
 490                 dev_err(dev, "reg not found in DT\n");
 491                 return r;
 492         }
 493
 494         c = devm_kzalloc(dev, sizeof(struct omap2_onenand), GFP_KERNEL);
 495         if (!c)
 496                 return -ENOMEM;
 497
 498         init_completion(&c->irq_done);
 499         init_completion(&c->dma_done);
 500         c->gpmc_cs = val;
 501         c->phys_base = res->start;
 502
 503         c->onenand.base = devm_ioremap_resource(dev, res);
 504         if (IS_ERR(c->onenand.base))
 505                 return PTR_ERR(c->onenand.base);
 506
 507         c->int_gpiod = devm_gpiod_get_optional(dev, "int", GPIOD_IN);
 508         if (IS_ERR(c->int_gpiod)) {
 509                 r = PTR_ERR(c->int_gpiod);
 510                 /* Just try again if this happens */
 511                 if (r != -EPROBE_DEFER)
 512                         dev_err(dev, "error getting gpio: %d\n", r);
 513                 return r;
 514         }
 515
 516         if (c->int_gpiod) {
 517                 r = devm_request_irq(dev, gpiod_to_irq(c->int_gpiod),
 518                                      omap2_onenand_interrupt,
 519                                      IRQF_TRIGGER_RISING, "onenand", c);
 520                 if (r)
 521                         return r;
 522
 523                 c->onenand.wait = omap2_onenand_wait;
 524         }
 525
 526         dma_cap_zero(mask);
 527         dma_cap_set(DMA_MEMCPY, mask);
 528
 529         c->dma_chan = dma_request_channel(mask, NULL, NULL);
 530         if (c->dma_chan) {
 531                 c->onenand.read_bufferram = omap2_onenand_read_bufferram;
 532                 c->onenand.write_bufferram = omap2_onenand_write_bufferram;
 533         }
 534
 535         c->pdev = pdev;
 536         c->mtd.priv = &c->onenand;
 537         c->mtd.dev.parent = dev;
 538         mtd_set_of_node(&c->mtd, dev->of_node);
 539
 540         dev_info(dev, "initializing on CS%d (0x%08lx), va %p, %s mode\n",
 541                  c->gpmc_cs, c->phys_base, c->onenand.base,
 542                  c->dma_chan ? "DMA" : "PIO");
 543
 544         if ((r = onenand_scan(&c->mtd, 1)) < 0)
 545                 goto err_release_dma;
 546
 547         freq = omap2_onenand_get_freq(c->onenand.version_id);
 548         if (freq > 0) {
 549                 switch (freq) {
 550                 case 104:
 551                         latency = 7;
 552                         break;
 553                 case 83:
 554                         latency = 6;
 555                         break;
 556                 case 66:
 557                         latency = 5;
 558                         break;
 559                 case 56:
 560                         latency = 4;
 561                         break;
 562                 default:        /* 40 MHz or lower */
 563                         latency = 3;
 564                         break;
 565                 }
 566
 567                 r = gpmc_omap_onenand_set_timings(dev, c->gpmc_cs,
 568                                                   freq, latency, &info);
 569                 if (r)
 570                         goto err_release_onenand;
 571
 572                 r = omap2_onenand_set_cfg(c, info.sync_read, info.sync_write,
 573                                           latency, info.burst_len);
 574                 if (r)
 575                         goto err_release_onenand;
 576
 577                 if (info.sync_read || info.sync_write)
 578                         dev_info(dev, "optimized timings for %d MHz\n", freq);
 579         }
 580
 581         r = mtd_device_register(&c->mtd, NULL, 0);
 582         if (r)
 583                 goto err_release_onenand;
 584
 585         platform_set_drvdata(pdev, c);
 586
 587         return 0;
 588
 589 err_release_onenand:
 590         onenand_release(&c->mtd);
 591 err_release_dma:
 592         if (c->dma_chan)
 593                 dma_release_channel(c->dma_chan);
 594
 595         return r;
 596 }
 597
 598 static int omap2_onenand_remove(struct platform_device *pdev)
 599 {
 600         struct omap2_onenand *c = dev_get_drvdata(&pdev->dev);
 601
 602         onenand_release(&c->mtd);
 603         if (c->dma_chan)
 604                 dma_release_channel(c->dma_chan);
 605         omap2_onenand_shutdown(pdev);
 606
 607         return 0;
 608 }
 609
 610 static const struct of_device_id omap2_onenand_id_table[] = {
 611         { .compatible = "ti,omap2-onenand", },
 612         {},
 613 };
 614 MODULE_DEVICE_TABLE(of, omap2_onenand_id_table);
 615
 616 static struct platform_driver omap2_onenand_driver = {
 617         .probe          = omap2_onenand_probe,
 618         .remove         = omap2_onenand_remove,
 619         .shutdown       = omap2_onenand_shutdown,
 620         .driver         = {
 621                 .name   = DRIVER_NAME,
 622                 .of_match_table = omap2_onenand_id_table,
 623         },
 624 };
 625
 626 module_platform_driver(omap2_onenand_driver);
 627
 628 MODULE_ALIAS("platform:" DRIVER_NAME);
 629 MODULE_LICENSE("GPL");
 630 MODULE_AUTHOR("Jarkko Lavinen <jarkko.lavinen@nokia.com>");
 631 MODULE_DESCRIPTION("Glue layer for OneNAND flash on OMAP2 / OMAP3");