release/src-rt-6.x/linux/linux-2.6/drivers/mtd/nand/ts7250.c

   1 /*
   2  * drivers/mtd/nand/ts7250.c
   3  *
   4  * Copyright (C) 2004 Technologic Systems (support@embeddedARM.com)
   5  *
   6  * Derived from drivers/mtd/nand/edb7312.c
   7  *   Copyright (C) 2004 Marius Gröger (mag@sysgo.de)
   8  *
   9  * Derived from drivers/mtd/nand/autcpu12.c
  10  *   Copyright (c) 2001 Thomas Gleixner (gleixner@autronix.de)
  11  *
  12  * $Id: ts7250.c,v 1.4 2004/12/30 22:02:07 joff Exp $
  13  *
  14  * This program is free software; you can redistribute it and/or modify
  15  * it under the terms of the GNU General Public License version 2 as
  16  * published by the Free Software Foundation.
  17  *
  18  * Overview:
  19  *   This is a device driver for the NAND flash device found on the
  20  *   TS-7250 board which utilizes a Samsung 32 Mbyte part.
  21  */
  22
  23 #include <linux/slab.h>
  24 #include <linux/module.h>
  25 #include <linux/init.h>
  26 #include <linux/mtd/mtd.h>
  27 #include <linux/mtd/nand.h>
  28 #include <linux/mtd/partitions.h>
  29 #include <asm/io.h>
  30 #include <asm/arch/hardware.h>
  31 #include <asm/sizes.h>
  32 #include <asm/mach-types.h>
  33
  34 /*
  35  * MTD structure for TS7250 board
  36  */
  37 static struct mtd_info *ts7250_mtd = NULL;
  38
  39 #ifdef CONFIG_MTD_PARTITIONS
  40 static const char *part_probes[] = { "cmdlinepart", NULL };
  41
  42 #define NUM_PARTITIONS 3
  43
  44 /*
  45  * Define static partitions for flash device
  46  */
  47 static struct mtd_partition partition_info32[] = {
  48         {
  49                 .name           = "TS-BOOTROM",
  50                 .offset         = 0x00000000,
  51                 .size           = 0x00004000,
  52         }, {
  53                 .name           = "Linux",
  54                 .offset         = 0x00004000,
  55                 .size           = 0x01d00000,
  56         }, {
  57                 .name           = "RedBoot",
  58                 .offset         = 0x01d04000,
  59                 .size           = 0x002fc000,
  60         },
  61 };
  62
  63 /*
  64  * Define static partitions for flash device
  65  */
  66 static struct mtd_partition partition_info128[] = {
  67         {
  68                 .name           = "TS-BOOTROM",
  69                 .offset         = 0x00000000,
  70                 .size           = 0x00004000,
  71         }, {
  72                 .name           = "Linux",
  73                 .offset         = 0x00004000,
  74                 .size           = 0x07d00000,
  75         }, {
  76                 .name           = "RedBoot",
  77                 .offset         = 0x07d04000,
  78                 .size           = 0x002fc000,
  79         },
  80 };
  81 #endif
  82
  83
  84 /*
  85  *      hardware specific access to control-lines
  86  *
  87  *      ctrl:
  88  *      NAND_NCE: bit 0 -> bit 2
  89  *      NAND_CLE: bit 1 -> bit 1
  90  *      NAND_ALE: bit 2 -> bit 0
  91  */
  92 static void ts7250_hwcontrol(struct mtd_info *mtd, int cmd, unsigned int ctrl)
  93 {
  94         struct nand_chip *chip = mtd->priv;
  95
  96         if (ctrl & NAND_CTRL_CHANGE) {
  97                 unsigned long addr = TS72XX_NAND_CONTROL_VIRT_BASE;
  98                 unsigned char bits;
  99
 100                 bits = (ctrl & NAND_NCE) << 2;
 101                 bits |= ctrl & NAND_CLE;
 102                 bits |= (ctrl & NAND_ALE) >> 2;
 103
 104                 __raw_writeb((__raw_readb(addr) & ~0x7) | bits, addr);
 105         }
 106
 107         if (cmd != NAND_CMD_NONE)
 108                 writeb(cmd, chip->IO_ADDR_W);
 109 }
 110
 111 /*
 112  *      read device ready pin
 113  */
 114 static int ts7250_device_ready(struct mtd_info *mtd)
 115 {
 116         return __raw_readb(TS72XX_NAND_BUSY_VIRT_BASE) & 0x20;
 117 }
 118
 119 /*
 120  * Main initialization routine
 121  */
 122 static int __init ts7250_init(void)
 123 {
 124         struct nand_chip *this;
 125         const char *part_type = 0;
 126         int mtd_parts_nb = 0;
 127         struct mtd_partition *mtd_parts = 0;
 128
 129         if (!machine_is_ts72xx() || board_is_ts7200())
 130                 return -ENXIO;
 131
 132         /* Allocate memory for MTD device structure and private data */
 133         ts7250_mtd = kmalloc(sizeof(struct mtd_info) + sizeof(struct nand_chip), GFP_KERNEL);
 134         if (!ts7250_mtd) {
 135                 printk("Unable to allocate TS7250 NAND MTD device structure.\n");
 136                 return -ENOMEM;
 137         }
 138
 139         /* Get pointer to private data */
 140         this = (struct nand_chip *)(&ts7250_mtd[1]);
 141
 142         /* Initialize structures */
 143         memset(ts7250_mtd, 0, sizeof(struct mtd_info));
 144         memset(this, 0, sizeof(struct nand_chip));
 145
 146         /* Link the private data with the MTD structure */
 147         ts7250_mtd->priv = this;
 148         ts7250_mtd->owner = THIS_MODULE;
 149
 150         /* insert callbacks */
 151         this->IO_ADDR_R = (void *)TS72XX_NAND_DATA_VIRT_BASE;
 152         this->IO_ADDR_W = (void *)TS72XX_NAND_DATA_VIRT_BASE;
 153         this->cmd_ctrl = ts7250_hwcontrol;
 154         this->dev_ready = ts7250_device_ready;
 155         this->chip_delay = 15;
 156         this->ecc.mode = NAND_ECC_SOFT;
 157
 158         printk("Searching for NAND flash...\n");
 159         /* Scan to find existence of the device */
 160         if (nand_scan(ts7250_mtd, 1)) {
 161                 kfree(ts7250_mtd);
 162                 return -ENXIO;
 163         }
 164 #ifdef CONFIG_MTD_PARTITIONS
 165         ts7250_mtd->name = "ts7250-nand";
 166         mtd_parts_nb = parse_mtd_partitions(ts7250_mtd, part_probes, &mtd_parts, 0);
 167         if (mtd_parts_nb > 0)
 168                 part_type = "command line";
 169         else
 170                 mtd_parts_nb = 0;
 171 #endif
 172         if (mtd_parts_nb == 0) {
 173                 mtd_parts = partition_info32;
 174                 if (ts7250_mtd->size >= (128 * 0x100000))
 175                         mtd_parts = partition_info128;
 176                 mtd_parts_nb = NUM_PARTITIONS;
 177                 part_type = "static";
 178         }
 179
 180         /* Register the partitions */
 181         printk(KERN_NOTICE "Using %s partition definition\n", part_type);
 182         add_mtd_partitions(ts7250_mtd, mtd_parts, mtd_parts_nb);
 183
 184         /* Return happy */
 185         return 0;
 186 }
 187
 188 module_init(ts7250_init);
 189
 190 /*
 191  * Clean up routine
 192  */
 193 static void __exit ts7250_cleanup(void)
 194 {
 195         /* Unregister the device */
 196         del_mtd_device(ts7250_mtd);
 197
 198         /* Free the MTD device structure */
 199         kfree(ts7250_mtd);
 200 }
 201
 202 module_exit(ts7250_cleanup);
 203
 204 MODULE_LICENSE("GPL");
 205 MODULE_AUTHOR("Jesse Off <joff@embeddedARM.com>");
 206 MODULE_DESCRIPTION("MTD map driver for Technologic Systems TS-7250 board");