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   1 /*
   2  * drivers/mtd/nand/sharpsl.c
   3  *
   4  *  Copyright (C) 2004 Richard Purdie
   5  *
   6  *  $Id: sharpsl.c,v 1.4 2005/01/23 11:09:19 rpurdie 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 /*
  51  * MTD structure for SharpSL
  52  */
  53 static struct mtd_info *sharpsl_mtd = NULL;
  54
  55 /*
  56  * Define partitions for flash device
  57  */
  58 #define DEFAULT_NUM_PARTITIONS 3
  59
  60 static int nr_partitions;
  61 static struct mtd_partition sharpsl_nand_default_partition_info[] = {
  62         {
  63         .name = "System Area",
  64         .offset = 0,
  65         .size = 7 * 1024 * 1024,
  66         },
  67         {
  68         .name = "Root Filesystem",
  69         .offset = 7 * 1024 * 1024,
  70         .size = 30 * 1024 * 1024,
  71         },
  72         {
  73         .name = "Home Filesystem",
  74         .offset = MTDPART_OFS_APPEND ,
  75         .size = MTDPART_SIZ_FULL ,
  76         },
  77 };
  78
  79 /*
  80  *      hardware specific access to control-lines
  81  */
  82 static void
  83 sharpsl_nand_hwcontrol(struct mtd_info* mtd, int cmd)
  84 {
  85         switch (cmd) {
  86         case NAND_CTL_SETCLE:
  87                 writeb(readb(FLASHCTL) | FLCLE, FLASHCTL);
  88                 break;
  89         case NAND_CTL_CLRCLE:
  90                 writeb(readb(FLASHCTL) & ~FLCLE, FLASHCTL);
  91                 break;
  92
  93         case NAND_CTL_SETALE:
  94                 writeb(readb(FLASHCTL) | FLALE, FLASHCTL);
  95                 break;
  96         case NAND_CTL_CLRALE:
  97                 writeb(readb(FLASHCTL) & ~FLALE, FLASHCTL);
  98                 break;
  99
 100         case NAND_CTL_SETNCE:
 101                 writeb(readb(FLASHCTL) & ~(FLCE0|FLCE1), FLASHCTL);
 102                 break;
 103         case NAND_CTL_CLRNCE:
 104                 writeb(readb(FLASHCTL) | (FLCE0|FLCE1), FLASHCTL);
 105                 break;
 106         }
 107 }
 108
 109 static uint8_t scan_ff_pattern[] = { 0xff, 0xff };
 110
 111 static struct nand_bbt_descr sharpsl_bbt = {
 112         .options = 0,
 113         .offs = 4,
 114         .len = 2,
 115         .pattern = scan_ff_pattern
 116 };
 117
 118 static int
 119 sharpsl_nand_dev_ready(struct mtd_info* mtd)
 120 {
 121         return !((readb(FLASHCTL) & FLRYBY) == 0);
 122 }
 123
 124 static void
 125 sharpsl_nand_enable_hwecc(struct mtd_info* mtd, int mode)
 126 {
 127         writeb(0 ,ECCCLRR);
 128 }
 129
 130 static int
 131 sharpsl_nand_calculate_ecc(struct mtd_info* mtd, const u_char* dat,
 132                                 u_char* ecc_code)
 133 {
 134         ecc_code[0] = ~readb(ECCLPUB);
 135         ecc_code[1] = ~readb(ECCLPLB);
 136         ecc_code[2] = (~readb(ECCCP) << 2) | 0x03;
 137         return readb(ECCCNTR) != 0;
 138 }
 139
 140
 141 #ifdef CONFIG_MTD_PARTITIONS
 142 const char *part_probes[] = { "cmdlinepart", NULL };
 143 #endif
 144
 145
 146 /*
 147  * Main initialization routine
 148  */
 149 int __init
 150 sharpsl_nand_init(void)
 151 {
 152         struct nand_chip *this;
 153         struct mtd_partition* sharpsl_partition_info;
 154         int err = 0;
 155
 156         /* Allocate memory for MTD device structure and private data */
 157         sharpsl_mtd = kmalloc(sizeof(struct mtd_info) + sizeof(struct nand_chip),
 158                                 GFP_KERNEL);
 159         if (!sharpsl_mtd) {
 160                 printk ("Unable to allocate SharpSL NAND MTD device structure.\n");
 161                 return -ENOMEM;
 162         }
 163
 164         /* map physical adress */
 165         sharpsl_io_base = ioremap(sharpsl_phys_base, 0x1000);
 166         if(!sharpsl_io_base){
 167                 printk("ioremap to access Sharp SL NAND chip failed\n");
 168                 kfree(sharpsl_mtd);
 169                 return -EIO;
 170         }
 171
 172         /* Get pointer to private data */
 173         this = (struct nand_chip *) (&sharpsl_mtd[1]);
 174
 175         /* Initialize structures */
 176         memset((char *) sharpsl_mtd, 0, sizeof(struct mtd_info));
 177         memset((char *) this, 0, sizeof(struct nand_chip));
 178
 179         /* Link the private data with the MTD structure */
 180         sharpsl_mtd->priv = this;
 181
 182         /*
 183          * PXA initialize
 184          */
 185         writeb(readb(FLASHCTL) | FLWP, FLASHCTL);
 186
 187         /* Set address of NAND IO lines */
 188         this->IO_ADDR_R = FLASHIO;
 189         this->IO_ADDR_W = FLASHIO;
 190         /* Set address of hardware control function */
 191         this->hwcontrol = sharpsl_nand_hwcontrol;
 192         this->dev_ready = sharpsl_nand_dev_ready;
 193         /* 15 us command delay time */
 194         this->chip_delay = 15;
 195         /* set eccmode using hardware ECC */
 196         this->eccmode = NAND_ECC_HW3_256;
 197         this->enable_hwecc = sharpsl_nand_enable_hwecc;
 198         this->calculate_ecc = sharpsl_nand_calculate_ecc;
 199         this->correct_data = nand_correct_data;
 200         this->badblock_pattern = &sharpsl_bbt;
 201
 202         /* Scan to find existence of the device */
 203         err=nand_scan(sharpsl_mtd,1);
 204         if (err) {
 205                 iounmap(sharpsl_io_base);
 206                 kfree(sharpsl_mtd);
 207                 return err;
 208         }
 209
 210         /* Register the partitions */
 211         sharpsl_mtd->name = "sharpsl-nand";
 212         nr_partitions = parse_mtd_partitions(sharpsl_mtd, part_probes,
 213                                                 &sharpsl_partition_info, 0);
 214
 215         if (nr_partitions <= 0) {
 216                 nr_partitions = DEFAULT_NUM_PARTITIONS;
 217                 sharpsl_partition_info = sharpsl_nand_default_partition_info;
 218                 if (machine_is_poodle()) {
 219                         sharpsl_partition_info[1].size=30 * 1024 * 1024;
 220                 } else if (machine_is_corgi() || machine_is_shepherd()) {
 221                         sharpsl_partition_info[1].size=25 * 1024 * 1024;
 222                 } else if (machine_is_husky()) {
 223                         sharpsl_partition_info[1].size=53 * 1024 * 1024;
 224                 }
 225         }
 226
 227         if (machine_is_husky()) {
 228                 /* Need to use small eraseblock size for backward compatibility */
 229                 sharpsl_mtd->flags |= MTD_NO_VIRTBLOCKS;
 230         }
 231
 232         add_mtd_partitions(sharpsl_mtd, sharpsl_partition_info, nr_partitions);
 233
 234         /* Return happy */
 235         return 0;
 236 }
 237 module_init(sharpsl_nand_init);
 238
 239 /*
 240  * Clean up routine
 241  */
 242 #ifdef MODULE
 243 static void __exit sharpsl_nand_cleanup(void)
 244 {
 245         struct nand_chip *this = (struct nand_chip *) &sharpsl_mtd[1];
 246
 247         /* Release resources, unregister device */
 248         nand_release(sharpsl_mtd);
 249
 250         iounmap(sharpsl_io_base);
 251
 252         /* Free the MTD device structure */
 253         kfree(sharpsl_mtd);
 254 }
 255 module_exit(sharpsl_nand_cleanup);
 256 #endif
 257
 258 MODULE_LICENSE("GPL");
 259 MODULE_AUTHOR("Richard Purdie <rpurdie@rpsys.net>");
 260 MODULE_DESCRIPTION("Device specific logic for NAND flash on Sharp SL-C7xx Series");