kernel/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/module.h>
  14 #include <linux/interrupt.h>
  15 #include <linux/io.h>
  16 #include <linux/platform_device.h>
  17 #include <linux/delay.h>
  18 #include <linux/clk.h>
  19 #include <linux/err.h>
  20
  21 #include <linux/mtd/mtd.h>
  22 #include <linux/mtd/nand.h>
  23 #include <linux/mtd/partitions.h>
  24
  25 #define REG_FMICSR      0x00
  26 #define REG_SMCSR       0xa0
  27 #define REG_SMISR       0xac
  28 #define REG_SMCMD       0xb0
  29 #define REG_SMADDR      0xb4
  30 #define REG_SMDATA      0xb8
  31
  32 #define RESET_FMI       0x01
  33 #define NAND_EN         0x08
  34 #define READYBUSY       (0x01 << 18)
  35
  36 #define SWRST           0x01
  37 #define PSIZE           (0x01 << 3)
  38 #define DMARWEN         (0x03 << 1)
  39 #define BUSWID          (0x01 << 4)
  40 #define ECC4EN          (0x01 << 5)
  41 #define WP              (0x01 << 24)
  42 #define NANDCS          (0x01 << 25)
  43 #define ENDADDR         (0x01 << 31)
  44
  45 #define read_data_reg(dev)              \
  46         __raw_readl((dev)->reg + REG_SMDATA)
  47
  48 #define write_data_reg(dev, val)        \
  49         __raw_writel((val), (dev)->reg + REG_SMDATA)
  50
  51 #define write_cmd_reg(dev, val)         \
  52         __raw_writel((val), (dev)->reg + REG_SMCMD)
  53
  54 #define write_addr_reg(dev, val)        \
  55         __raw_writel((val), (dev)->reg + REG_SMADDR)
  56
  57 struct nuc900_nand {
  58         struct mtd_info mtd;
  59         struct nand_chip chip;
  60         void __iomem *reg;
  61         struct clk *clk;
  62         spinlock_t lock;
  63 };
  64
  65 static const struct mtd_partition partitions[] = {
  66         {
  67          .name = "NAND FS 0",
  68          .offset = 0,
  69          .size = 8 * 1024 * 1024
  70         },
  71         {
  72          .name = "NAND FS 1",
  73          .offset = MTDPART_OFS_APPEND,
  74          .size = MTDPART_SIZ_FULL
  75         }
  76 };
  77
  78 static unsigned char nuc900_nand_read_byte(struct mtd_info *mtd)
  79 {
  80         unsigned char ret;
  81         struct nuc900_nand *nand;
  82
  83         nand = container_of(mtd, struct nuc900_nand, mtd);
  84
  85         ret = (unsigned char)read_data_reg(nand);
  86
  87         return ret;
  88 }
  89
  90 static void nuc900_nand_read_buf(struct mtd_info *mtd,
  91                                  unsigned char *buf, int len)
  92 {
  93         int i;
  94         struct nuc900_nand *nand;
  95
  96         nand = container_of(mtd, struct nuc900_nand, mtd);
  97
  98         for (i = 0; i < len; i++)
  99                 buf[i] = (unsigned char)read_data_reg(nand);
 100 }
 101
 102 static void nuc900_nand_write_buf(struct mtd_info *mtd,
 103                                   const unsigned char *buf, int len)
 104 {
 105         int i;
 106         struct nuc900_nand *nand;
 107
 108         nand = container_of(mtd, struct nuc900_nand, mtd);
 109
 110         for (i = 0; i < len; i++)
 111                 write_data_reg(nand, buf[i]);
 112 }
 113
 114 static int nuc900_check_rb(struct nuc900_nand *nand)
 115 {
 116         unsigned int val;
 117         spin_lock(&nand->lock);
 118         val = __raw_readl(REG_SMISR);
 119         val &= READYBUSY;
 120         spin_unlock(&nand->lock);
 121
 122         return val;
 123 }
 124
 125 static int nuc900_nand_devready(struct mtd_info *mtd)
 126 {
 127         struct nuc900_nand *nand;
 128         int ready;
 129
 130         nand = container_of(mtd, struct nuc900_nand, mtd);
 131
 132         ready = (nuc900_check_rb(nand)) ? 1 : 0;
 133         return ready;
 134 }
 135
 136 static void nuc900_nand_command_lp(struct mtd_info *mtd, unsigned int command,
 137                                    int column, int page_addr)
 138 {
 139         register struct nand_chip *chip = mtd->priv;
 140         struct nuc900_nand *nand;
 141
 142         nand = container_of(mtd, struct nuc900_nand, mtd);
 143
 144         if (command == NAND_CMD_READOOB) {
 145                 column += mtd->writesize;
 146                 command = NAND_CMD_READ0;
 147         }
 148
 149         write_cmd_reg(nand, command & 0xff);
 150
 151         if (column != -1 || page_addr != -1) {
 152
 153                 if (column != -1) {
 154                         if (chip->options & NAND_BUSWIDTH_16 &&
 155                                         !nand_opcode_8bits(command))
 156                                 column >>= 1;
 157                         write_addr_reg(nand, column);
 158                         write_addr_reg(nand, column >> 8 | ENDADDR);
 159                 }
 160                 if (page_addr != -1) {
 161                         write_addr_reg(nand, page_addr);
 162
 163                         if (chip->chipsize > (128 << 20)) {
 164                                 write_addr_reg(nand, page_addr >> 8);
 165                                 write_addr_reg(nand, page_addr >> 16 | ENDADDR);
 166                         } else {
 167                                 write_addr_reg(nand, page_addr >> 8 | ENDADDR);
 168                         }
 169                 }
 170         }
 171
 172         switch (command) {
 173         case NAND_CMD_CACHEDPROG:
 174         case NAND_CMD_PAGEPROG:
 175         case NAND_CMD_ERASE1:
 176         case NAND_CMD_ERASE2:
 177         case NAND_CMD_SEQIN:
 178         case NAND_CMD_RNDIN:
 179         case NAND_CMD_STATUS:
 180                 return;
 181
 182         case NAND_CMD_RESET:
 183                 if (chip->dev_ready)
 184                         break;
 185                 udelay(chip->chip_delay);
 186
 187                 write_cmd_reg(nand, NAND_CMD_STATUS);
 188                 write_cmd_reg(nand, command);
 189
 190                 while (!nuc900_check_rb(nand))
 191                         ;
 192
 193                 return;
 194
 195         case NAND_CMD_RNDOUT:
 196                 write_cmd_reg(nand, NAND_CMD_RNDOUTSTART);
 197                 return;
 198
 199         case NAND_CMD_READ0:
 200
 201                 write_cmd_reg(nand, NAND_CMD_READSTART);
 202         default:
 203
 204                 if (!chip->dev_ready) {
 205                         udelay(chip->chip_delay);
 206                         return;
 207                 }
 208         }
 209
 210         /* Apply this short delay always to ensure that we do wait tWB in
 211          * any case on any machine. */
 212         ndelay(100);
 213
 214         while (!chip->dev_ready(mtd))
 215                 ;
 216 }
 217
 218
 219 static void nuc900_nand_enable(struct nuc900_nand *nand)
 220 {
 221         unsigned int val;
 222         spin_lock(&nand->lock);
 223         __raw_writel(RESET_FMI, (nand->reg + REG_FMICSR));
 224
 225         val = __raw_readl(nand->reg + REG_FMICSR);
 226
 227         if (!(val & NAND_EN))
 228                 __raw_writel(val | NAND_EN, nand->reg + REG_FMICSR);
 229
 230         val = __raw_readl(nand->reg + REG_SMCSR);
 231
 232         val &= ~(SWRST|PSIZE|DMARWEN|BUSWID|ECC4EN|NANDCS);
 233         val |= WP;
 234
 235         __raw_writel(val, nand->reg + REG_SMCSR);
 236
 237         spin_unlock(&nand->lock);
 238 }
 239
 240 static int nuc900_nand_probe(struct platform_device *pdev)
 241 {
 242         struct nuc900_nand *nuc900_nand;
 243         struct nand_chip *chip;
 244         struct resource *res;
 245
 246         nuc900_nand = devm_kzalloc(&pdev->dev, sizeof(struct nuc900_nand),
 247                                    GFP_KERNEL);
 248         if (!nuc900_nand)
 249                 return -ENOMEM;
 250         chip = &(nuc900_nand->chip);
 251
 252         nuc900_nand->mtd.priv   = chip;
 253         nuc900_nand->mtd.owner  = THIS_MODULE;
 254         spin_lock_init(&nuc900_nand->lock);
 255
 256         nuc900_nand->clk = devm_clk_get(&pdev->dev, NULL);
 257         if (IS_ERR(nuc900_nand->clk))
 258                 return -ENOENT;
 259         clk_enable(nuc900_nand->clk);
 260
 261         chip->cmdfunc           = nuc900_nand_command_lp;
 262         chip->dev_ready         = nuc900_nand_devready;
 263         chip->read_byte         = nuc900_nand_read_byte;
 264         chip->write_buf         = nuc900_nand_write_buf;
 265         chip->read_buf          = nuc900_nand_read_buf;
 266         chip->chip_delay        = 50;
 267         chip->options           = 0;
 268         chip->ecc.mode          = NAND_ECC_SOFT;
 269
 270         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 271         nuc900_nand->reg = devm_ioremap_resource(&pdev->dev, res);
 272         if (IS_ERR(nuc900_nand->reg))
 273                 return PTR_ERR(nuc900_nand->reg);
 274
 275         nuc900_nand_enable(nuc900_nand);
 276
 277         if (nand_scan(&(nuc900_nand->mtd), 1))
 278                 return -ENXIO;
 279
 280         mtd_device_register(&(nuc900_nand->mtd), partitions,
 281                             ARRAY_SIZE(partitions));
 282
 283         platform_set_drvdata(pdev, nuc900_nand);
 284
 285         return 0;
 286 }
 287
 288 static int nuc900_nand_remove(struct platform_device *pdev)
 289 {
 290         struct nuc900_nand *nuc900_nand = platform_get_drvdata(pdev);
 291
 292         nand_release(&nuc900_nand->mtd);
 293         clk_disable(nuc900_nand->clk);
 294
 295         return 0;
 296 }
 297
 298 static struct platform_driver nuc900_nand_driver = {
 299         .probe          = nuc900_nand_probe,
 300         .remove         = nuc900_nand_remove,
 301         .driver         = {
 302                 .name   = "nuc900-fmi",
 303         },
 304 };
 305
 306 module_platform_driver(nuc900_nand_driver);
 307
 308 MODULE_AUTHOR("Wan ZongShun <mcuos.com@gmail.com>");
 309 MODULE_DESCRIPTION("w90p910/NUC9xx nand driver!");
 310 MODULE_LICENSE("GPL");
 311 MODULE_ALIAS("platform:nuc900-fmi");