kernel/2.6.29.6-aldebaran-rt/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 <asm/io.h>
  28 #include <mach/hardware.h>
  29 #include <asm/sizes.h>
  30 #include <asm/mach-types.h>
  31
  32 /*
  33  * MTD structure for TS7250 board
  34  */
  35 static struct mtd_info *ts7250_mtd = NULL;
  36
  37 #ifdef CONFIG_MTD_PARTITIONS
  38 static const char *part_probes[] = { "cmdlinepart", NULL };
  39
  40 #define NUM_PARTITIONS 3
  41
  42 /*
  43  * Define static partitions for flash device
  44  */
  45 static struct mtd_partition partition_info32[] = {
  46         {
  47                 .name           = "TS-BOOTROM",
  48                 .offset         = 0x00000000,
  49                 .size           = 0x00004000,
  50         }, {
  51                 .name           = "Linux",
  52                 .offset         = 0x00004000,
  53                 .size           = 0x01d00000,
  54         }, {
  55                 .name           = "RedBoot",
  56                 .offset         = 0x01d04000,
  57                 .size           = 0x002fc000,
  58         },
  59 };
  60
  61 /*
  62  * Define static partitions for flash device
  63  */
  64 static struct mtd_partition partition_info128[] = {
  65         {
  66                 .name           = "TS-BOOTROM",
  67                 .offset         = 0x00000000,
  68                 .size           = 0x00004000,
  69         }, {
  70                 .name           = "Linux",
  71                 .offset         = 0x00004000,
  72                 .size           = 0x07d00000,
  73         }, {
  74                 .name           = "RedBoot",
  75                 .offset         = 0x07d04000,
  76                 .size           = 0x002fc000,
  77         },
  78 };
  79 #endif
  80
  81
  82 /*
  83  *      hardware specific access to control-lines
  84  *
  85  *      ctrl:
  86  *      NAND_NCE: bit 0 -> bit 2
  87  *      NAND_CLE: bit 1 -> bit 1
  88  *      NAND_ALE: bit 2 -> bit 0
  89  */
  90 static void ts7250_hwcontrol(struct mtd_info *mtd, int cmd, unsigned int ctrl)
  91 {
  92         struct nand_chip *chip = mtd->priv;
  93
  94         if (ctrl & NAND_CTRL_CHANGE) {
  95                 unsigned long addr = TS72XX_NAND_CONTROL_VIRT_BASE;
  96                 unsigned char bits;
  97
  98                 bits = (ctrl & NAND_NCE) << 2;
  99                 bits |= ctrl & NAND_CLE;
 100                 bits |= (ctrl & NAND_ALE) >> 2;
 101
 102                 __raw_writeb((__raw_readb(addr) & ~0x7) | bits, addr);
 103         }
 104
 105         if (cmd != NAND_CMD_NONE)
 106                 writeb(cmd, chip->IO_ADDR_W);
 107 }
 108
 109 /*
 110  *      read device ready pin
 111  */
 112 static int ts7250_device_ready(struct mtd_info *mtd)
 113 {
 114         return __raw_readb(TS72XX_NAND_BUSY_VIRT_BASE) & 0x20;
 115 }
 116
 117 /*
 118  * Main initialization routine
 119  */
 120 static int __init ts7250_init(void)
 121 {
 122         struct nand_chip *this;
 123         const char *part_type = 0;
 124         int mtd_parts_nb = 0;
 125         struct mtd_partition *mtd_parts = 0;
 126
 127         if (!machine_is_ts72xx() || board_is_ts7200())
 128                 return -ENXIO;
 129
 130         /* Allocate memory for MTD device structure and private data */
 131         ts7250_mtd = kmalloc(sizeof(struct mtd_info) + sizeof(struct nand_chip), GFP_KERNEL);
 132         if (!ts7250_mtd) {
 133                 printk("Unable to allocate TS7250 NAND MTD device structure.\n");
 134                 return -ENOMEM;
 135         }
 136
 137         /* Get pointer to private data */
 138         this = (struct nand_chip *)(&ts7250_mtd[1]);
 139
 140         /* Initialize structures */
 141         memset(ts7250_mtd, 0, sizeof(struct mtd_info));
 142         memset(this, 0, sizeof(struct nand_chip));
 143
 144         /* Link the private data with the MTD structure */
 145         ts7250_mtd->priv = this;
 146         ts7250_mtd->owner = THIS_MODULE;
 147
 148         /* insert callbacks */
 149         this->IO_ADDR_R = (void *)TS72XX_NAND_DATA_VIRT_BASE;
 150         this->IO_ADDR_W = (void *)TS72XX_NAND_DATA_VIRT_BASE;
 151         this->cmd_ctrl = ts7250_hwcontrol;
 152         this->dev_ready = ts7250_device_ready;
 153         this->chip_delay = 15;
 154         this->ecc.mode = NAND_ECC_SOFT;
 155
 156         printk("Searching for NAND flash...\n");
 157         /* Scan to find existence of the device */
 158         if (nand_scan(ts7250_mtd, 1)) {
 159                 kfree(ts7250_mtd);
 160                 return -ENXIO;
 161         }
 162 #ifdef CONFIG_MTD_PARTITIONS
 163         ts7250_mtd->name = "ts7250-nand";
 164         mtd_parts_nb = parse_mtd_partitions(ts7250_mtd, part_probes, &mtd_parts, 0);
 165         if (mtd_parts_nb > 0)
 166                 part_type = "command line";
 167         else
 168                 mtd_parts_nb = 0;
 169 #endif
 170         if (mtd_parts_nb == 0) {
 171                 mtd_parts = partition_info32;
 172                 if (ts7250_mtd->size >= (128 * 0x100000))
 173                         mtd_parts = partition_info128;
 174                 mtd_parts_nb = NUM_PARTITIONS;
 175                 part_type = "static";
 176         }
 177
 178         /* Register the partitions */
 179         printk(KERN_NOTICE "Using %s partition definition\n", part_type);
 180         add_mtd_partitions(ts7250_mtd, mtd_parts, mtd_parts_nb);
 181
 182         /* Return happy */
 183         return 0;
 184 }
 185
 186 module_init(ts7250_init);
 187
 188 /*
 189  * Clean up routine
 190  */
 191 static void __exit ts7250_cleanup(void)
 192 {
 193         /* Unregister the device */
 194         del_mtd_device(ts7250_mtd);
 195
 196         /* Free the MTD device structure */
 197         kfree(ts7250_mtd);
 198 }
 199
 200 module_exit(ts7250_cleanup);
 201
 202 MODULE_LICENSE("GPL");
 203 MODULE_AUTHOR("Jesse Off <joff@embeddedARM.com>");
 204 MODULE_DESCRIPTION("MTD map driver for Technologic Systems TS-7250 board");