drivers/mtd/nand/nuc900_nand.c

   1 /*
   2  * Copyright © 2009 Nuvoton technology corporation.
   3  *
   4  * Wan ZongShun <mcuos.com@gmail.com>
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License as published by
   8  * the Free Software Foundation;version 2 of the License.
   9  *
  10  */
  11
  12 #include <linux/slab.h>
  13 #include <linux/init.h>
  14 #include <linux/module.h>
  15 #include <linux/interrupt.h>
  16 #include <linux/io.h>
  17 #include <linux/platform_device.h>
  18 #include <linux/delay.h>
  19 #include <linux/clk.h>
  20 #include <linux/err.h>
  21
  22 #include <linux/mtd/mtd.h>
  23 #include <linux/mtd/nand.h>
  24 #include <linux/mtd/partitions.h>
  25
  26 #define REG_FMICSR      0x00
  27 #define REG_SMCSR       0xa0
  28 #define REG_SMISR       0xac
  29 #define REG_SMCMD       0xb0
  30 #define REG_SMADDR      0xb4
  31 #define REG_SMDATA      0xb8
  32
  33 #define RESET_FMI       0x01
  34 #define NAND_EN         0x08
  35 #define READYBUSY       (0x01 << 18)
  36
  37 #define SWRST           0x01
  38 #define PSIZE           (0x01 << 3)
  39 #define DMARWEN         (0x03 << 1)
  40 #define BUSWID          (0x01 << 4)
  41 #define ECC4EN          (0x01 << 5)
  42 #define WP              (0x01 << 24)
  43 #define NANDCS          (0x01 << 25)
  44 #define ENDADDR         (0x01 << 31)
  45
  46 #define read_data_reg(dev)              \
  47         __raw_readl((dev)->reg + REG_SMDATA)
  48
  49 #define write_data_reg(dev, val)        \
  50         __raw_writel((val), (dev)->reg + REG_SMDATA)
  51
  52 #define write_cmd_reg(dev, val)         \
  53         __raw_writel((val), (dev)->reg + REG_SMCMD)
  54
  55 #define write_addr_reg(dev, val)        \
  56         __raw_writel((val), (dev)->reg + REG_SMADDR)
  57
  58 struct nuc900_nand {
  59         struct mtd_info mtd;
  60         struct nand_chip chip;
  61         void __iomem *reg;
  62         struct clk *clk;
  63         spinlock_t lock;
  64 };
  65
  66 static const struct mtd_partition partitions[] = {
  67         {
  68          .name = "NAND FS 0",
  69          .offset = 0,
  70          .size = 8 * 1024 * 1024
  71         },
  72         {
  73          .name = "NAND FS 1",
  74          .offset = MTDPART_OFS_APPEND,
  75          .size = MTDPART_SIZ_FULL
  76         }
  77 };
  78
  79 static unsigned char nuc900_nand_read_byte(struct mtd_info *mtd)
  80 {
  81         unsigned char ret;
  82         struct nuc900_nand *nand;
  83
  84         nand = container_of(mtd, struct nuc900_nand, mtd);
  85
  86         ret = (unsigned char)read_data_reg(nand);
  87
  88         return ret;
  89 }
  90
  91 static void nuc900_nand_read_buf(struct mtd_info *mtd,
  92                                  unsigned char *buf, int len)
  93 {
  94         int i;
  95         struct nuc900_nand *nand;
  96
  97         nand = container_of(mtd, struct nuc900_nand, mtd);
  98
  99         for (i = 0; i < len; i++)
 100                 buf[i] = (unsigned char)read_data_reg(nand);
 101 }
 102
 103 static void nuc900_nand_write_buf(struct mtd_info *mtd,
 104                                   const unsigned char *buf, int len)
 105 {
 106         int i;
 107         struct nuc900_nand *nand;
 108
 109         nand = container_of(mtd, struct nuc900_nand, mtd);
 110
 111         for (i = 0; i < len; i++)
 112                 write_data_reg(nand, buf[i]);
 113 }
 114
 115 static int nuc900_verify_buf(struct mtd_info *mtd,
 116                              const unsigned char *buf, int len)
 117 {
 118         int i;
 119         struct nuc900_nand *nand;
 120
 121         nand = container_of(mtd, struct nuc900_nand, mtd);
 122
 123         for (i = 0; i < len; i++) {
 124                 if (buf[i] != (unsigned char)read_data_reg(nand))
 125                         return -EFAULT;
 126         }
 127
 128         return 0;
 129 }
 130
 131 static int nuc900_check_rb(struct nuc900_nand *nand)
 132 {
 133         unsigned int val;
 134         spin_lock(&nand->lock);
 135         val = __raw_readl(REG_SMISR);
 136         val &= READYBUSY;
 137         spin_unlock(&nand->lock);
 138
 139         return val;
 140 }
 141
 142 static int nuc900_nand_devready(struct mtd_info *mtd)
 143 {
 144         struct nuc900_nand *nand;
 145         int ready;
 146
 147         nand = container_of(mtd, struct nuc900_nand, mtd);
 148
 149         ready = (nuc900_check_rb(nand)) ? 1 : 0;
 150         return ready;
 151 }
 152
 153 static void nuc900_nand_command_lp(struct mtd_info *mtd, unsigned int command,
 154                                    int column, int page_addr)
 155 {
 156         register struct nand_chip *chip = mtd->priv;
 157         struct nuc900_nand *nand;
 158
 159         nand = container_of(mtd, struct nuc900_nand, mtd);
 160
 161         if (command == NAND_CMD_READOOB) {
 162                 column += mtd->writesize;
 163                 command = NAND_CMD_READ0;
 164         }
 165
 166         write_cmd_reg(nand, command & 0xff);
 167
 168         if (column != -1 || page_addr != -1) {
 169
 170                 if (column != -1) {
 171                         if (chip->options & NAND_BUSWIDTH_16)
 172                                 column >>= 1;
 173                         write_addr_reg(nand, column);
 174                         write_addr_reg(nand, column >> 8 | ENDADDR);
 175                 }
 176                 if (page_addr != -1) {
 177                         write_addr_reg(nand, page_addr);
 178
 179                         if (chip->chipsize > (128 << 20)) {
 180                                 write_addr_reg(nand, page_addr >> 8);
 181                                 write_addr_reg(nand, page_addr >> 16 | ENDADDR);
 182                         } else {
 183                                 write_addr_reg(nand, page_addr >> 8 | ENDADDR);
 184                         }
 185                 }
 186         }
 187
 188         switch (command) {
 189         case NAND_CMD_CACHEDPROG:
 190         case NAND_CMD_PAGEPROG:
 191         case NAND_CMD_ERASE1:
 192         case NAND_CMD_ERASE2:
 193         case NAND_CMD_SEQIN:
 194         case NAND_CMD_RNDIN:
 195         case NAND_CMD_STATUS:
 196         case NAND_CMD_DEPLETE1:
 197                 return;
 198
 199         case NAND_CMD_STATUS_ERROR:
 200         case NAND_CMD_STATUS_ERROR0:
 201         case NAND_CMD_STATUS_ERROR1:
 202         case NAND_CMD_STATUS_ERROR2:
 203         case NAND_CMD_STATUS_ERROR3:
 204                 udelay(chip->chip_delay);
 205                 return;
 206
 207         case NAND_CMD_RESET:
 208                 if (chip->dev_ready)
 209                         break;
 210                 udelay(chip->chip_delay);
 211
 212                 write_cmd_reg(nand, NAND_CMD_STATUS);
 213                 write_cmd_reg(nand, command);
 214
 215                 while (!nuc900_check_rb(nand))
 216                         ;
 217
 218                 return;
 219
 220         case NAND_CMD_RNDOUT:
 221                 write_cmd_reg(nand, NAND_CMD_RNDOUTSTART);
 222                 return;
 223
 224         case NAND_CMD_READ0:
 225
 226                 write_cmd_reg(nand, NAND_CMD_READSTART);
 227         default:
 228
 229                 if (!chip->dev_ready) {
 230                         udelay(chip->chip_delay);
 231                         return;
 232                 }
 233         }
 234
 235         /* Apply this short delay always to ensure that we do wait tWB in
 236          * any case on any machine. */
 237         ndelay(100);
 238
 239         while (!chip->dev_ready(mtd))
 240                 ;
 241 }
 242
 243
 244 static void nuc900_nand_enable(struct nuc900_nand *nand)
 245 {
 246         unsigned int val;
 247         spin_lock(&nand->lock);
 248         __raw_writel(RESET_FMI, (nand->reg + REG_FMICSR));
 249
 250         val = __raw_readl(nand->reg + REG_FMICSR);
 251
 252         if (!(val & NAND_EN))
 253                 __raw_writel(val | NAND_EN, REG_FMICSR);
 254
 255         val = __raw_readl(nand->reg + REG_SMCSR);
 256
 257         val &= ~(SWRST|PSIZE|DMARWEN|BUSWID|ECC4EN|NANDCS);
 258         val |= WP;
 259
 260         __raw_writel(val, nand->reg + REG_SMCSR);
 261
 262         spin_unlock(&nand->lock);
 263 }
 264
 265 static int __devinit nuc900_nand_probe(struct platform_device *pdev)
 266 {
 267         struct nuc900_nand *nuc900_nand;
 268         struct nand_chip *chip;
 269         int retval;
 270         struct resource *res;
 271
 272         retval = 0;
 273
 274         nuc900_nand = kzalloc(sizeof(struct nuc900_nand), GFP_KERNEL);
 275         if (!nuc900_nand)
 276                 return -ENOMEM;
 277         chip = &(nuc900_nand->chip);
 278
 279         nuc900_nand->mtd.priv   = chip;
 280         nuc900_nand->mtd.owner  = THIS_MODULE;
 281         spin_lock_init(&nuc900_nand->lock);
 282
 283         nuc900_nand->clk = clk_get(&pdev->dev, NULL);
 284         if (IS_ERR(nuc900_nand->clk)) {
 285                 retval = -ENOENT;
 286                 goto fail1;
 287         }
 288         clk_enable(nuc900_nand->clk);
 289
 290         chip->cmdfunc           = nuc900_nand_command_lp;
 291         chip->dev_ready         = nuc900_nand_devready;
 292         chip->read_byte         = nuc900_nand_read_byte;
 293         chip->write_buf         = nuc900_nand_write_buf;
 294         chip->read_buf          = nuc900_nand_read_buf;
 295         chip->verify_buf        = nuc900_verify_buf;
 296         chip->chip_delay        = 50;
 297         chip->options           = 0;
 298         chip->ecc.mode          = NAND_ECC_SOFT;
 299
 300         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 301         if (!res) {
 302                 retval = -ENXIO;
 303                 goto fail1;
 304         }
 305
 306         if (!request_mem_region(res->start, resource_size(res), pdev->name)) {
 307                 retval = -EBUSY;
 308                 goto fail1;
 309         }
 310
 311         nuc900_nand->reg = ioremap(res->start, resource_size(res));
 312         if (!nuc900_nand->reg) {
 313                 retval = -ENOMEM;
 314                 goto fail2;
 315         }
 316
 317         nuc900_nand_enable(nuc900_nand);
 318
 319         if (nand_scan(&(nuc900_nand->mtd), 1)) {
 320                 retval = -ENXIO;
 321                 goto fail3;
 322         }
 323
 324         mtd_device_register(&(nuc900_nand->mtd), partitions,
 325                             ARRAY_SIZE(partitions));
 326
 327         platform_set_drvdata(pdev, nuc900_nand);
 328
 329         return retval;
 330
 331 fail3:  iounmap(nuc900_nand->reg);
 332 fail2:  release_mem_region(res->start, resource_size(res));
 333 fail1:  kfree(nuc900_nand);
 334         return retval;
 335 }
 336
 337 static int __devexit nuc900_nand_remove(struct platform_device *pdev)
 338 {
 339         struct nuc900_nand *nuc900_nand = platform_get_drvdata(pdev);
 340         struct resource *res;
 341
 342         iounmap(nuc900_nand->reg);
 343
 344         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 345         release_mem_region(res->start, resource_size(res));
 346
 347         clk_disable(nuc900_nand->clk);
 348         clk_put(nuc900_nand->clk);
 349
 350         kfree(nuc900_nand);
 351
 352         platform_set_drvdata(pdev, NULL);
 353
 354         return 0;
 355 }
 356
 357 static struct platform_driver nuc900_nand_driver = {
 358         .probe          = nuc900_nand_probe,
 359         .remove         = __devexit_p(nuc900_nand_remove),
 360         .driver         = {
 361                 .name   = "nuc900-fmi",
 362                 .owner  = THIS_MODULE,
 363         },
 364 };
 365
 366 static int __init nuc900_nand_init(void)
 367 {
 368         return platform_driver_register(&nuc900_nand_driver);
 369 }
 370
 371 static void __exit nuc900_nand_exit(void)
 372 {
 373         platform_driver_unregister(&nuc900_nand_driver);
 374 }
 375
 376 module_init(nuc900_nand_init);
 377 module_exit(nuc900_nand_exit);
 378
 379 MODULE_AUTHOR("Wan ZongShun <mcuos.com@gmail.com>");
 380 MODULE_DESCRIPTION("w90p910/NUC9xx nand driver!");
 381 MODULE_LICENSE("GPL");
 382 MODULE_ALIAS("platform:nuc900-fmi");