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