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  * This program is free software; you can redistribute it and/or modify
  13  * it under the terms of the GNU General Public License version 2 as
  14  * published by the Free Software Foundation.
  15  *
  16  * Overview:
  17  *   This is a device driver for the NAND flash device found on the
  18  *   TS-7250 board which utilizes a Samsung 32 Mbyte part.
  19  */
  20
  21 #include <linux/slab.h>
  22 #include <linux/module.h>
  23 #include <linux/init.h>
  24 #include <linux/mtd/mtd.h>
  25 #include <linux/mtd/nand.h>
  26 #include <linux/mtd/partitions.h>
  27 #include <linux/io.h>
  28
  29 #include <mach/hardware.h>
  30 #include <mach/ts72xx.h>
  31
  32 #include <asm/sizes.h>
  33 #include <asm/mach-types.h>
  34
  35 /*
  36  * MTD structure for TS7250 board
  37  */
  38 static struct mtd_info *ts7250_mtd = NULL;
  39
  40 #ifdef CONFIG_MTD_PARTITIONS
  41 static const char *part_probes[] = { "cmdlinepart", NULL };
  42
  43 #define NUM_PARTITIONS 3
  44
  45 /*
  46  * Define static partitions for flash device
  47  */
  48 static struct mtd_partition partition_info32[] = {
  49         {
  50                 .name           = "TS-BOOTROM",
  51                 .offset         = 0x00000000,
  52                 .size           = 0x00004000,
  53         }, {
  54                 .name           = "Linux",
  55                 .offset         = 0x00004000,
  56                 .size           = 0x01d00000,
  57         }, {
  58                 .name           = "RedBoot",
  59                 .offset         = 0x01d04000,
  60                 .size           = 0x002fc000,
  61         },
  62 };
  63
  64 /*
  65  * Define static partitions for flash device
  66  */
  67 static struct mtd_partition partition_info128[] = {
  68         {
  69                 .name           = "TS-BOOTROM",
  70                 .offset         = 0x00000000,
  71                 .size           = 0x00004000,
  72         }, {
  73                 .name           = "Linux",
  74                 .offset         = 0x00004000,
  75                 .size           = 0x07d00000,
  76         }, {
  77                 .name           = "RedBoot",
  78                 .offset         = 0x07d04000,
  79                 .size           = 0x002fc000,
  80         },
  81 };
  82 #endif
  83
  84
  85 /*
  86  *      hardware specific access to control-lines
  87  *
  88  *      ctrl:
  89  *      NAND_NCE: bit 0 -> bit 2
  90  *      NAND_CLE: bit 1 -> bit 1
  91  *      NAND_ALE: bit 2 -> bit 0
  92  */
  93 static void ts7250_hwcontrol(struct mtd_info *mtd, int cmd, unsigned int ctrl)
  94 {
  95         struct nand_chip *chip = mtd->priv;
  96
  97         if (ctrl & NAND_CTRL_CHANGE) {
  98                 unsigned long addr = TS72XX_NAND_CONTROL_VIRT_BASE;
  99                 unsigned char bits;
 100
 101                 bits = (ctrl & NAND_NCE) << 2;
 102                 bits |= ctrl & NAND_CLE;
 103                 bits |= (ctrl & NAND_ALE) >> 2;
 104
 105                 __raw_writeb((__raw_readb(addr) & ~0x7) | bits, addr);
 106         }
 107
 108         if (cmd != NAND_CMD_NONE)
 109                 writeb(cmd, chip->IO_ADDR_W);
 110 }
 111
 112 /*
 113  *      read device ready pin
 114  */
 115 static int ts7250_device_ready(struct mtd_info *mtd)
 116 {
 117         return __raw_readb(TS72XX_NAND_BUSY_VIRT_BASE) & 0x20;
 118 }
 119
 120 /*
 121  * Main initialization routine
 122  */
 123 static int __init ts7250_init(void)
 124 {
 125         struct nand_chip *this;
 126         const char *part_type = 0;
 127         int mtd_parts_nb = 0;
 128         struct mtd_partition *mtd_parts = 0;
 129
 130         if (!machine_is_ts72xx() || board_is_ts7200())
 131                 return -ENXIO;
 132
 133         /* Allocate memory for MTD device structure and private data */
 134         ts7250_mtd = kmalloc(sizeof(struct mtd_info) + sizeof(struct nand_chip), GFP_KERNEL);
 135         if (!ts7250_mtd) {
 136                 printk("Unable to allocate TS7250 NAND MTD device structure.\n");
 137                 return -ENOMEM;
 138         }
 139
 140         /* Get pointer to private data */
 141         this = (struct nand_chip *)(&ts7250_mtd[1]);
 142
 143         /* Initialize structures */
 144         memset(ts7250_mtd, 0, sizeof(struct mtd_info));
 145         memset(this, 0, sizeof(struct nand_chip));
 146
 147         /* Link the private data with the MTD structure */
 148         ts7250_mtd->priv = this;
 149         ts7250_mtd->owner = THIS_MODULE;
 150
 151         /* insert callbacks */
 152         this->IO_ADDR_R = (void *)TS72XX_NAND_DATA_VIRT_BASE;
 153         this->IO_ADDR_W = (void *)TS72XX_NAND_DATA_VIRT_BASE;
 154         this->cmd_ctrl = ts7250_hwcontrol;
 155         this->dev_ready = ts7250_device_ready;
 156         this->chip_delay = 15;
 157         this->ecc.mode = NAND_ECC_SOFT;
 158
 159         printk("Searching for NAND flash...\n");
 160         /* Scan to find existence of the device */
 161         if (nand_scan(ts7250_mtd, 1)) {
 162                 kfree(ts7250_mtd);
 163                 return -ENXIO;
 164         }
 165 #ifdef CONFIG_MTD_PARTITIONS
 166         ts7250_mtd->name = "ts7250-nand";
 167         mtd_parts_nb = parse_mtd_partitions(ts7250_mtd, part_probes, &mtd_parts, 0);
 168         if (mtd_parts_nb > 0)
 169                 part_type = "command line";
 170         else
 171                 mtd_parts_nb = 0;
 172 #endif
 173         if (mtd_parts_nb == 0) {
 174                 mtd_parts = partition_info32;
 175                 if (ts7250_mtd->size >= (128 * 0x100000))
 176                         mtd_parts = partition_info128;
 177                 mtd_parts_nb = NUM_PARTITIONS;
 178                 part_type = "static";
 179         }
 180
 181         /* Register the partitions */
 182         printk(KERN_NOTICE "Using %s partition definition\n", part_type);
 183         add_mtd_partitions(ts7250_mtd, mtd_parts, mtd_parts_nb);
 184
 185         /* Return happy */
 186         return 0;
 187 }
 188
 189 module_init(ts7250_init);
 190
 191 /*
 192  * Clean up routine
 193  */
 194 static void __exit ts7250_cleanup(void)
 195 {
 196         /* Unregister the device */
 197         del_mtd_device(ts7250_mtd);
 198
 199         /* Free the MTD device structure */
 200         kfree(ts7250_mtd);
 201 }
 202
 203 module_exit(ts7250_cleanup);
 204
 205 MODULE_LICENSE("GPL");
 206 MODULE_AUTHOR("Jesse Off <joff@embeddedARM.com>");
 207 MODULE_DESCRIPTION("MTD map driver for Technologic Systems TS-7250 board");