drivers/mtd/nand/txx9ndfmc.c

   1 /*
   2  * TXx9 NAND flash memory controller driver
   3  * Based on RBTX49xx patch from CELF patch archive.
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License version 2 as
   7  * published by the Free Software Foundation.
   8  *
   9  * (C) Copyright TOSHIBA CORPORATION 2004-2007
  10  * All Rights Reserved.
  11  */
  12 #include <linux/err.h>
  13 #include <linux/init.h>
  14 #include <linux/slab.h>
  15 #include <linux/module.h>
  16 #include <linux/platform_device.h>
  17 #include <linux/delay.h>
  18 #include <linux/mtd/mtd.h>
  19 #include <linux/mtd/nand.h>
  20 #include <linux/mtd/nand_ecc.h>
  21 #include <linux/mtd/partitions.h>
  22 #include <linux/io.h>
  23 #include <asm/txx9/ndfmc.h>
  24
  25 /* TXX9 NDFMC Registers */
  26 #define TXX9_NDFDTR     0x00
  27 #define TXX9_NDFMCR     0x04
  28 #define TXX9_NDFSR      0x08
  29 #define TXX9_NDFISR     0x0c
  30 #define TXX9_NDFIMR     0x10
  31 #define TXX9_NDFSPR     0x14
  32 #define TXX9_NDFRSTR    0x18    /* not TX4939 */
  33
  34 /* NDFMCR : NDFMC Mode Control */
  35 #define TXX9_NDFMCR_WE  0x80
  36 #define TXX9_NDFMCR_ECC_ALL     0x60
  37 #define TXX9_NDFMCR_ECC_RESET   0x60
  38 #define TXX9_NDFMCR_ECC_READ    0x40
  39 #define TXX9_NDFMCR_ECC_ON      0x20
  40 #define TXX9_NDFMCR_ECC_OFF     0x00
  41 #define TXX9_NDFMCR_CE  0x10
  42 #define TXX9_NDFMCR_BSPRT       0x04    /* TX4925/TX4926 only */
  43 #define TXX9_NDFMCR_ALE 0x02
  44 #define TXX9_NDFMCR_CLE 0x01
  45 /* TX4939 only */
  46 #define TXX9_NDFMCR_X16 0x0400
  47 #define TXX9_NDFMCR_DMAREQ_MASK 0x0300
  48 #define TXX9_NDFMCR_DMAREQ_NODMA        0x0000
  49 #define TXX9_NDFMCR_DMAREQ_128  0x0100
  50 #define TXX9_NDFMCR_DMAREQ_256  0x0200
  51 #define TXX9_NDFMCR_DMAREQ_512  0x0300
  52 #define TXX9_NDFMCR_CS_MASK     0x0c
  53 #define TXX9_NDFMCR_CS(ch)      ((ch) << 2)
  54
  55 /* NDFMCR : NDFMC Status */
  56 #define TXX9_NDFSR_BUSY 0x80
  57 /* TX4939 only */
  58 #define TXX9_NDFSR_DMARUN       0x40
  59
  60 /* NDFMCR : NDFMC Reset */
  61 #define TXX9_NDFRSTR_RST        0x01
  62
  63 struct txx9ndfmc_priv {
  64         struct platform_device *dev;
  65         struct nand_chip chip;
  66         int cs;
  67         const char *mtdname;
  68 };
  69
  70 #define MAX_TXX9NDFMC_DEV       4
  71 struct txx9ndfmc_drvdata {
  72         struct mtd_info *mtds[MAX_TXX9NDFMC_DEV];
  73         void __iomem *base;
  74         unsigned char hold;     /* in gbusclock */
  75         unsigned char spw;      /* in gbusclock */
  76         struct nand_hw_control hw_control;
  77 };
  78
  79 static struct platform_device *mtd_to_platdev(struct mtd_info *mtd)
  80 {
  81         struct nand_chip *chip = mtd_to_nand(mtd);
  82         struct txx9ndfmc_priv *txx9_priv = nand_get_controller_data(chip);
  83         return txx9_priv->dev;
  84 }
  85
  86 static void __iomem *ndregaddr(struct platform_device *dev, unsigned int reg)
  87 {
  88         struct txx9ndfmc_drvdata *drvdata = platform_get_drvdata(dev);
  89         struct txx9ndfmc_platform_data *plat = dev_get_platdata(&dev->dev);
  90
  91         return drvdata->base + (reg << plat->shift);
  92 }
  93
  94 static u32 txx9ndfmc_read(struct platform_device *dev, unsigned int reg)
  95 {
  96         return __raw_readl(ndregaddr(dev, reg));
  97 }
  98
  99 static void txx9ndfmc_write(struct platform_device *dev,
 100                             u32 val, unsigned int reg)
 101 {
 102         __raw_writel(val, ndregaddr(dev, reg));
 103 }
 104
 105 static uint8_t txx9ndfmc_read_byte(struct mtd_info *mtd)
 106 {
 107         struct platform_device *dev = mtd_to_platdev(mtd);
 108
 109         return txx9ndfmc_read(dev, TXX9_NDFDTR);
 110 }
 111
 112 static void txx9ndfmc_write_buf(struct mtd_info *mtd, const uint8_t *buf,
 113                                 int len)
 114 {
 115         struct platform_device *dev = mtd_to_platdev(mtd);
 116         void __iomem *ndfdtr = ndregaddr(dev, TXX9_NDFDTR);
 117         u32 mcr = txx9ndfmc_read(dev, TXX9_NDFMCR);
 118
 119         txx9ndfmc_write(dev, mcr | TXX9_NDFMCR_WE, TXX9_NDFMCR);
 120         while (len--)
 121                 __raw_writel(*buf++, ndfdtr);
 122         txx9ndfmc_write(dev, mcr, TXX9_NDFMCR);
 123 }
 124
 125 static void txx9ndfmc_read_buf(struct mtd_info *mtd, uint8_t *buf, int len)
 126 {
 127         struct platform_device *dev = mtd_to_platdev(mtd);
 128         void __iomem *ndfdtr = ndregaddr(dev, TXX9_NDFDTR);
 129
 130         while (len--)
 131                 *buf++ = __raw_readl(ndfdtr);
 132 }
 133
 134 static void txx9ndfmc_cmd_ctrl(struct mtd_info *mtd, int cmd,
 135                                unsigned int ctrl)
 136 {
 137         struct nand_chip *chip = mtd_to_nand(mtd);
 138         struct txx9ndfmc_priv *txx9_priv = nand_get_controller_data(chip);
 139         struct platform_device *dev = txx9_priv->dev;
 140         struct txx9ndfmc_platform_data *plat = dev_get_platdata(&dev->dev);
 141
 142         if (ctrl & NAND_CTRL_CHANGE) {
 143                 u32 mcr = txx9ndfmc_read(dev, TXX9_NDFMCR);
 144
 145                 mcr &= ~(TXX9_NDFMCR_CLE | TXX9_NDFMCR_ALE | TXX9_NDFMCR_CE);
 146                 mcr |= ctrl & NAND_CLE ? TXX9_NDFMCR_CLE : 0;
 147                 mcr |= ctrl & NAND_ALE ? TXX9_NDFMCR_ALE : 0;
 148                 /* TXX9_NDFMCR_CE bit is 0:high 1:low */
 149                 mcr |= ctrl & NAND_NCE ? TXX9_NDFMCR_CE : 0;
 150                 if (txx9_priv->cs >= 0 && (ctrl & NAND_NCE)) {
 151                         mcr &= ~TXX9_NDFMCR_CS_MASK;
 152                         mcr |= TXX9_NDFMCR_CS(txx9_priv->cs);
 153                 }
 154                 txx9ndfmc_write(dev, mcr, TXX9_NDFMCR);
 155         }
 156         if (cmd != NAND_CMD_NONE)
 157                 txx9ndfmc_write(dev, cmd & 0xff, TXX9_NDFDTR);
 158         if (plat->flags & NDFMC_PLAT_FLAG_DUMMYWRITE) {
 159                 /* dummy write to update external latch */
 160                 if ((ctrl & NAND_CTRL_CHANGE) && cmd == NAND_CMD_NONE)
 161                         txx9ndfmc_write(dev, 0, TXX9_NDFDTR);
 162         }
 163         mmiowb();
 164 }
 165
 166 static int txx9ndfmc_dev_ready(struct mtd_info *mtd)
 167 {
 168         struct platform_device *dev = mtd_to_platdev(mtd);
 169
 170         return !(txx9ndfmc_read(dev, TXX9_NDFSR) & TXX9_NDFSR_BUSY);
 171 }
 172
 173 static int txx9ndfmc_calculate_ecc(struct mtd_info *mtd, const uint8_t *dat,
 174                                    uint8_t *ecc_code)
 175 {
 176         struct platform_device *dev = mtd_to_platdev(mtd);
 177         struct nand_chip *chip = mtd_to_nand(mtd);
 178         int eccbytes;
 179         u32 mcr = txx9ndfmc_read(dev, TXX9_NDFMCR);
 180
 181         mcr &= ~TXX9_NDFMCR_ECC_ALL;
 182         txx9ndfmc_write(dev, mcr | TXX9_NDFMCR_ECC_OFF, TXX9_NDFMCR);
 183         txx9ndfmc_write(dev, mcr | TXX9_NDFMCR_ECC_READ, TXX9_NDFMCR);
 184         for (eccbytes = chip->ecc.bytes; eccbytes > 0; eccbytes -= 3) {
 185                 ecc_code[1] = txx9ndfmc_read(dev, TXX9_NDFDTR);
 186                 ecc_code[0] = txx9ndfmc_read(dev, TXX9_NDFDTR);
 187                 ecc_code[2] = txx9ndfmc_read(dev, TXX9_NDFDTR);
 188                 ecc_code += 3;
 189         }
 190         txx9ndfmc_write(dev, mcr | TXX9_NDFMCR_ECC_OFF, TXX9_NDFMCR);
 191         return 0;
 192 }
 193
 194 static int txx9ndfmc_correct_data(struct mtd_info *mtd, unsigned char *buf,
 195                 unsigned char *read_ecc, unsigned char *calc_ecc)
 196 {
 197         struct nand_chip *chip = mtd_to_nand(mtd);
 198         int eccsize;
 199         int corrected = 0;
 200         int stat;
 201
 202         for (eccsize = chip->ecc.size; eccsize > 0; eccsize -= 256) {
 203                 stat = __nand_correct_data(buf, read_ecc, calc_ecc, 256);
 204                 if (stat < 0)
 205                         return stat;
 206                 corrected += stat;
 207                 buf += 256;
 208                 read_ecc += 3;
 209                 calc_ecc += 3;
 210         }
 211         return corrected;
 212 }
 213
 214 static void txx9ndfmc_enable_hwecc(struct mtd_info *mtd, int mode)
 215 {
 216         struct platform_device *dev = mtd_to_platdev(mtd);
 217         u32 mcr = txx9ndfmc_read(dev, TXX9_NDFMCR);
 218
 219         mcr &= ~TXX9_NDFMCR_ECC_ALL;
 220         txx9ndfmc_write(dev, mcr | TXX9_NDFMCR_ECC_RESET, TXX9_NDFMCR);
 221         txx9ndfmc_write(dev, mcr | TXX9_NDFMCR_ECC_OFF, TXX9_NDFMCR);
 222         txx9ndfmc_write(dev, mcr | TXX9_NDFMCR_ECC_ON, TXX9_NDFMCR);
 223 }
 224
 225 static void txx9ndfmc_initialize(struct platform_device *dev)
 226 {
 227         struct txx9ndfmc_platform_data *plat = dev_get_platdata(&dev->dev);
 228         struct txx9ndfmc_drvdata *drvdata = platform_get_drvdata(dev);
 229         int tmout = 100;
 230
 231         if (plat->flags & NDFMC_PLAT_FLAG_NO_RSTR)
 232                 ; /* no NDFRSTR.  Write to NDFSPR resets the NDFMC. */
 233         else {
 234                 /* reset NDFMC */
 235                 txx9ndfmc_write(dev,
 236                                 txx9ndfmc_read(dev, TXX9_NDFRSTR) |
 237                                 TXX9_NDFRSTR_RST,
 238                                 TXX9_NDFRSTR);
 239                 while (txx9ndfmc_read(dev, TXX9_NDFRSTR) & TXX9_NDFRSTR_RST) {
 240                         if (--tmout == 0) {
 241                                 dev_err(&dev->dev, "reset failed.\n");
 242                                 break;
 243                         }
 244                         udelay(1);
 245                 }
 246         }
 247         /* setup Hold Time, Strobe Pulse Width */
 248         txx9ndfmc_write(dev, (drvdata->hold << 4) | drvdata->spw, TXX9_NDFSPR);
 249         txx9ndfmc_write(dev,
 250                         (plat->flags & NDFMC_PLAT_FLAG_USE_BSPRT) ?
 251                         TXX9_NDFMCR_BSPRT : 0, TXX9_NDFMCR);
 252 }
 253
 254 #define TXX9NDFMC_NS_TO_CYC(gbusclk, ns) \
 255         DIV_ROUND_UP((ns) * DIV_ROUND_UP(gbusclk, 1000), 1000000)
 256
 257 static int txx9ndfmc_nand_scan(struct mtd_info *mtd)
 258 {
 259         struct nand_chip *chip = mtd_to_nand(mtd);
 260         int ret;
 261
 262         ret = nand_scan_ident(mtd, 1, NULL);
 263         if (!ret) {
 264                 if (mtd->writesize >= 512) {
 265                         /* Hardware ECC 6 byte ECC per 512 Byte data */
 266                         chip->ecc.size = 512;
 267                         chip->ecc.bytes = 6;
 268                 }
 269                 ret = nand_scan_tail(mtd);
 270         }
 271         return ret;
 272 }
 273
 274 static int __init txx9ndfmc_probe(struct platform_device *dev)
 275 {
 276         struct txx9ndfmc_platform_data *plat = dev_get_platdata(&dev->dev);
 277         int hold, spw;
 278         int i;
 279         struct txx9ndfmc_drvdata *drvdata;
 280         unsigned long gbusclk = plat->gbus_clock;
 281         struct resource *res;
 282
 283         drvdata = devm_kzalloc(&dev->dev, sizeof(*drvdata), GFP_KERNEL);
 284         if (!drvdata)
 285                 return -ENOMEM;
 286         res = platform_get_resource(dev, IORESOURCE_MEM, 0);
 287         drvdata->base = devm_ioremap_resource(&dev->dev, res);
 288         if (IS_ERR(drvdata->base))
 289                 return PTR_ERR(drvdata->base);
 290
 291         hold = plat->hold ?: 20; /* tDH */
 292         spw = plat->spw ?: 90; /* max(tREADID, tWP, tRP) */
 293
 294         hold = TXX9NDFMC_NS_TO_CYC(gbusclk, hold);
 295         spw = TXX9NDFMC_NS_TO_CYC(gbusclk, spw);
 296         if (plat->flags & NDFMC_PLAT_FLAG_HOLDADD)
 297                 hold -= 2;      /* actual hold time : (HOLD + 2) BUSCLK */
 298         spw -= 1;       /* actual wait time : (SPW + 1) BUSCLK */
 299         hold = clamp(hold, 1, 15);
 300         drvdata->hold = hold;
 301         spw = clamp(spw, 1, 15);
 302         drvdata->spw = spw;
 303         dev_info(&dev->dev, "CLK:%ldMHz HOLD:%d SPW:%d\n",
 304                  (gbusclk + 500000) / 1000000, hold, spw);
 305
 306         nand_hw_control_init(&drvdata->hw_control);
 307
 308         platform_set_drvdata(dev, drvdata);
 309         txx9ndfmc_initialize(dev);
 310
 311         for (i = 0; i < MAX_TXX9NDFMC_DEV; i++) {
 312                 struct txx9ndfmc_priv *txx9_priv;
 313                 struct nand_chip *chip;
 314                 struct mtd_info *mtd;
 315
 316                 if (!(plat->ch_mask & (1 << i)))
 317                         continue;
 318                 txx9_priv = kzalloc(sizeof(struct txx9ndfmc_priv),
 319                                     GFP_KERNEL);
 320                 if (!txx9_priv)
 321                         continue;
 322                 chip = &txx9_priv->chip;
 323                 mtd = nand_to_mtd(chip);
 324                 mtd->dev.parent = &dev->dev;
 325
 326                 chip->read_byte = txx9ndfmc_read_byte;
 327                 chip->read_buf = txx9ndfmc_read_buf;
 328                 chip->write_buf = txx9ndfmc_write_buf;
 329                 chip->cmd_ctrl = txx9ndfmc_cmd_ctrl;
 330                 chip->dev_ready = txx9ndfmc_dev_ready;
 331                 chip->ecc.calculate = txx9ndfmc_calculate_ecc;
 332                 chip->ecc.correct = txx9ndfmc_correct_data;
 333                 chip->ecc.hwctl = txx9ndfmc_enable_hwecc;
 334                 chip->ecc.mode = NAND_ECC_HW;
 335                 /* txx9ndfmc_nand_scan will overwrite ecc.size and ecc.bytes */
 336                 chip->ecc.size = 256;
 337                 chip->ecc.bytes = 3;
 338                 chip->ecc.strength = 1;
 339                 chip->chip_delay = 100;
 340                 chip->controller = &drvdata->hw_control;
 341
 342                 nand_set_controller_data(chip, txx9_priv);
 343                 txx9_priv->dev = dev;
 344
 345                 if (plat->ch_mask != 1) {
 346                         txx9_priv->cs = i;
 347                         txx9_priv->mtdname = kasprintf(GFP_KERNEL, "%s.%u",
 348                                                        dev_name(&dev->dev), i);
 349                 } else {
 350                         txx9_priv->cs = -1;
 351                         txx9_priv->mtdname = kstrdup(dev_name(&dev->dev),
 352                                                      GFP_KERNEL);
 353                 }
 354                 if (!txx9_priv->mtdname) {
 355                         kfree(txx9_priv);
 356                         dev_err(&dev->dev, "Unable to allocate MTD name.\n");
 357                         continue;
 358                 }
 359                 if (plat->wide_mask & (1 << i))
 360                         chip->options |= NAND_BUSWIDTH_16;
 361
 362                 if (txx9ndfmc_nand_scan(mtd)) {
 363                         kfree(txx9_priv->mtdname);
 364                         kfree(txx9_priv);
 365                         continue;
 366                 }
 367                 mtd->name = txx9_priv->mtdname;
 368
 369                 mtd_device_parse_register(mtd, NULL, NULL, NULL, 0);
 370                 drvdata->mtds[i] = mtd;
 371         }
 372
 373         return 0;
 374 }
 375
 376 static int __exit txx9ndfmc_remove(struct platform_device *dev)
 377 {
 378         struct txx9ndfmc_drvdata *drvdata = platform_get_drvdata(dev);
 379         int i;
 380
 381         if (!drvdata)
 382                 return 0;
 383         for (i = 0; i < MAX_TXX9NDFMC_DEV; i++) {
 384                 struct mtd_info *mtd = drvdata->mtds[i];
 385                 struct nand_chip *chip;
 386                 struct txx9ndfmc_priv *txx9_priv;
 387
 388                 if (!mtd)
 389                         continue;
 390                 chip = mtd_to_nand(mtd);
 391                 txx9_priv = nand_get_controller_data(chip);
 392
 393                 nand_release(mtd);
 394                 kfree(txx9_priv->mtdname);
 395                 kfree(txx9_priv);
 396         }
 397         return 0;
 398 }
 399
 400 #ifdef CONFIG_PM
 401 static int txx9ndfmc_resume(struct platform_device *dev)
 402 {
 403         if (platform_get_drvdata(dev))
 404                 txx9ndfmc_initialize(dev);
 405         return 0;
 406 }
 407 #else
 408 #define txx9ndfmc_resume NULL
 409 #endif
 410
 411 static struct platform_driver txx9ndfmc_driver = {
 412         .remove         = __exit_p(txx9ndfmc_remove),
 413         .resume         = txx9ndfmc_resume,
 414         .driver         = {
 415                 .name   = "txx9ndfmc",
 416         },
 417 };
 418
 419 module_platform_driver_probe(txx9ndfmc_driver, txx9ndfmc_probe);
 420
 421 MODULE_LICENSE("GPL");
 422 MODULE_DESCRIPTION("TXx9 SoC NAND flash controller driver");
 423 MODULE_ALIAS("platform:txx9ndfmc");