git.oblomov.eu Git - linux-2.6/blob - drivers/mtd/nand/sharpsl.c

   1 /*
   2  * drivers/mtd/nand/sharpsl.c
   3  *
   4  *  Copyright (C) 2004 Richard Purdie
   5  *
   6  *  $Id: sharpsl.c,v 1.7 2005/11/07 11:14:31 gleixner Exp $
   7  *
   8  *  Based on Sharp's NAND driver sharp_sl.c
   9  *
  10  * This program is free software; you can redistribute it and/or modify
  11  * it under the terms of the GNU General Public License version 2 as
  12  * published by the Free Software Foundation.
  13  *
  14  */
  15
  16 #include <linux/genhd.h>
  17 #include <linux/slab.h>
  18 #include <linux/module.h>
  19 #include <linux/delay.h>
  20 #include <linux/mtd/mtd.h>
  21 #include <linux/mtd/nand.h>
  22 #include <linux/mtd/nand_ecc.h>
  23 #include <linux/mtd/partitions.h>
  24 #include <linux/interrupt.h>
  25 #include <asm/io.h>
  26 #include <asm/hardware.h>
  27 #include <asm/mach-types.h>
  28
  29 static void __iomem *sharpsl_io_base;
  30 static int sharpsl_phys_base = 0x0C000000;
  31
  32 /* register offset */
  33 #define ECCLPLB         sharpsl_io_base+0x00    /* line parity 7 - 0 bit */
  34 #define ECCLPUB         sharpsl_io_base+0x04    /* line parity 15 - 8 bit */
  35 #define ECCCP           sharpsl_io_base+0x08    /* column parity 5 - 0 bit */
  36 #define ECCCNTR         sharpsl_io_base+0x0C    /* ECC byte counter */
  37 #define ECCCLRR         sharpsl_io_base+0x10    /* cleare ECC */
  38 #define FLASHIO         sharpsl_io_base+0x14    /* Flash I/O */
  39 #define FLASHCTL        sharpsl_io_base+0x18    /* Flash Control */
  40
  41 /* Flash control bit */
  42 #define FLRYBY          (1 << 5)
  43 #define FLCE1           (1 << 4)
  44 #define FLWP            (1 << 3)
  45 #define FLALE           (1 << 2)
  46 #define FLCLE           (1 << 1)
  47 #define FLCE0           (1 << 0)
  48
  49 /*
  50  * MTD structure for SharpSL
  51  */
  52 static struct mtd_info *sharpsl_mtd = NULL;
  53
  54 /*
  55  * Define partitions for flash device
  56  */
  57 #define DEFAULT_NUM_PARTITIONS 3
  58
  59 static int nr_partitions;
  60 static struct mtd_partition sharpsl_nand_default_partition_info[] = {
  61         {
  62          .name = "System Area",
  63          .offset = 0,
  64          .size = 7 * 1024 * 1024,
  65          },
  66         {
  67          .name = "Root Filesystem",
  68          .offset = 7 * 1024 * 1024,
  69          .size = 30 * 1024 * 1024,
  70          },
  71         {
  72          .name = "Home Filesystem",
  73          .offset = MTDPART_OFS_APPEND,
  74          .size = MTDPART_SIZ_FULL,
  75          },
  76 };
  77
  78 /*
  79  *      hardware specific access to control-lines
  80  *      ctrl:
  81  *      NAND_CNE: bit 0 -> bit 0 & 4
  82  *      NAND_CLE: bit 1 -> bit 1
  83  *      NAND_ALE: bit 2 -> bit 2
  84  *
  85  */
  86 static void sharpsl_nand_hwcontrol(struct mtd_info *mtd, int cmd,
  87                                    unsigned int ctrl)
  88 {
  89         struct nand_chip *chip = mtd->priv;
  90
  91         if (ctrl & NAND_CTRL_CHANGE) {
  92                 unsigned char bits = ctrl & 0x07;
  93
  94                 bits |= (ctrl & 0x01) << 4;
  95                 writeb((readb(FLASHCTL) & 0x17) | bits, FLASHCTL);
  96         }
  97
  98         if (cmd != NAND_CMD_NONE)
  99                 writeb(cmd, chip->IO_ADDR_W);
 100 }
 101
 102 static uint8_t scan_ff_pattern[] = { 0xff, 0xff };
 103
 104 static struct nand_bbt_descr sharpsl_bbt = {
 105         .options = 0,
 106         .offs = 4,
 107         .len = 2,
 108         .pattern = scan_ff_pattern
 109 };
 110
 111 static struct nand_bbt_descr sharpsl_akita_bbt = {
 112         .options = 0,
 113         .offs = 4,
 114         .len = 1,
 115         .pattern = scan_ff_pattern
 116 };
 117
 118 static struct nand_ecclayout akita_oobinfo = {
 119         .eccbytes = 24,
 120         .eccpos = {
 121                    0x5, 0x1, 0x2, 0x3, 0x6, 0x7, 0x15, 0x11,
 122                    0x12, 0x13, 0x16, 0x17, 0x25, 0x21, 0x22, 0x23,
 123                    0x26, 0x27, 0x35, 0x31, 0x32, 0x33, 0x36, 0x37},
 124         .oobfree = {{0x08, 0x09}}
 125 };
 126
 127 static int sharpsl_nand_dev_ready(struct mtd_info *mtd)
 128 {
 129         return !((readb(FLASHCTL) & FLRYBY) == 0);
 130 }
 131
 132 static void sharpsl_nand_enable_hwecc(struct mtd_info *mtd, int mode)
 133 {
 134         writeb(0, ECCCLRR);
 135 }
 136
 137 static int sharpsl_nand_calculate_ecc(struct mtd_info *mtd, const u_char * dat, u_char * ecc_code)
 138 {
 139         ecc_code[0] = ~readb(ECCLPUB);
 140         ecc_code[1] = ~readb(ECCLPLB);
 141         ecc_code[2] = (~readb(ECCCP) << 2) | 0x03;
 142         return readb(ECCCNTR) != 0;
 143 }
 144
 145 #ifdef CONFIG_MTD_PARTITIONS
 146 const char *part_probes[] = { "cmdlinepart", NULL };
 147 #endif
 148
 149 /*
 150  * Main initialization routine
 151  */
 152 static int __init sharpsl_nand_init(void)
 153 {
 154         struct nand_chip *this;
 155         struct mtd_partition *sharpsl_partition_info;
 156         int err = 0;
 157
 158         /* Allocate memory for MTD device structure and private data */
 159         sharpsl_mtd = kmalloc(sizeof(struct mtd_info) + sizeof(struct nand_chip), GFP_KERNEL);
 160         if (!sharpsl_mtd) {
 161                 printk("Unable to allocate SharpSL NAND MTD device structure.\n");
 162                 return -ENOMEM;
 163         }
 164
 165         /* map physical adress */
 166         sharpsl_io_base = ioremap(sharpsl_phys_base, 0x1000);
 167         if (!sharpsl_io_base) {
 168                 printk("ioremap to access Sharp SL NAND chip failed\n");
 169                 kfree(sharpsl_mtd);
 170                 return -EIO;
 171         }
 172
 173         /* Get pointer to private data */
 174         this = (struct nand_chip *)(&sharpsl_mtd[1]);
 175
 176         /* Initialize structures */
 177         memset(sharpsl_mtd, 0, sizeof(struct mtd_info));
 178         memset(this, 0, sizeof(struct nand_chip));
 179
 180         /* Link the private data with the MTD structure */
 181         sharpsl_mtd->priv = this;
 182         sharpsl_mtd->owner = THIS_MODULE;
 183
 184         /*
 185          * PXA initialize
 186          */
 187         writeb(readb(FLASHCTL) | FLWP, FLASHCTL);
 188
 189         /* Set address of NAND IO lines */
 190         this->IO_ADDR_R = FLASHIO;
 191         this->IO_ADDR_W = FLASHIO;
 192         /* Set address of hardware control function */
 193         this->cmd_ctrl = sharpsl_nand_hwcontrol;
 194         this->dev_ready = sharpsl_nand_dev_ready;
 195         /* 15 us command delay time */
 196         this->chip_delay = 15;
 197         /* set eccmode using hardware ECC */
 198         this->ecc.mode = NAND_ECC_HW;
 199         this->ecc.size = 256;
 200         this->ecc.bytes = 3;
 201         this->badblock_pattern = &sharpsl_bbt;
 202         if (machine_is_akita() || machine_is_borzoi()) {
 203                 this->badblock_pattern = &sharpsl_akita_bbt;
 204                 this->ecc.layout = &akita_oobinfo;
 205         }
 206         this->ecc.hwctl = sharpsl_nand_enable_hwecc;
 207         this->ecc.calculate = sharpsl_nand_calculate_ecc;
 208         this->ecc.correct = nand_correct_data;
 209
 210         /* Scan to find existence of the device */
 211         err = nand_scan(sharpsl_mtd, 1);
 212         if (err) {
 213                 iounmap(sharpsl_io_base);
 214                 kfree(sharpsl_mtd);
 215                 return err;
 216         }
 217
 218         /* Register the partitions */
 219         sharpsl_mtd->name = "sharpsl-nand";
 220         nr_partitions = parse_mtd_partitions(sharpsl_mtd, part_probes, &sharpsl_partition_info, 0);
 221
 222         if (nr_partitions <= 0) {
 223                 nr_partitions = DEFAULT_NUM_PARTITIONS;
 224                 sharpsl_partition_info = sharpsl_nand_default_partition_info;
 225                 if (machine_is_poodle()) {
 226                         sharpsl_partition_info[1].size = 22 * 1024 * 1024;
 227                 } else if (machine_is_corgi() || machine_is_shepherd()) {
 228                         sharpsl_partition_info[1].size = 25 * 1024 * 1024;
 229                 } else if (machine_is_husky()) {
 230                         sharpsl_partition_info[1].size = 53 * 1024 * 1024;
 231                 } else if (machine_is_spitz()) {
 232                         sharpsl_partition_info[1].size = 5 * 1024 * 1024;
 233                 } else if (machine_is_akita()) {
 234                         sharpsl_partition_info[1].size = 58 * 1024 * 1024;
 235                 } else if (machine_is_borzoi()) {
 236                         sharpsl_partition_info[1].size = 32 * 1024 * 1024;
 237                 }
 238         }
 239
 240         if (machine_is_husky() || machine_is_borzoi() || machine_is_akita()) {
 241                 /* Need to use small eraseblock size for backward compatibility */
 242                 sharpsl_mtd->flags |= MTD_NO_VIRTBLOCKS;
 243         }
 244
 245         add_mtd_partitions(sharpsl_mtd, sharpsl_partition_info, nr_partitions);
 246
 247         /* Return happy */
 248         return 0;
 249 }
 250
 251 module_init(sharpsl_nand_init);
 252
 253 /*
 254  * Clean up routine
 255  */
 256 static void __exit sharpsl_nand_cleanup(void)
 257 {
 258         struct nand_chip *this = (struct nand_chip *)&sharpsl_mtd[1];
 259
 260         /* Release resources, unregister device */
 261         nand_release(sharpsl_mtd);
 262
 263         iounmap(sharpsl_io_base);
 264
 265         /* Free the MTD device structure */
 266         kfree(sharpsl_mtd);
 267 }
 268
 269 module_exit(sharpsl_nand_cleanup);
 270
 271 MODULE_LICENSE("GPL");
 272 MODULE_AUTHOR("Richard Purdie <rpurdie@rpsys.net>");
 273 MODULE_DESCRIPTION("Device specific logic for NAND flash on Sharp SL-C7xx Series");