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   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 static void ts7250_hwcontrol(struct mtd_info *mtd, int cmd)
  88 {
  89         unsigned long ctrl = TS72XX_NAND_CONTROL_VIRT_BASE;
  90
  91         switch(cmd) {
  92         case NAND_CTL_SETCLE:
  93                 __raw_writeb(__raw_readb(ctrl) | 0x2, ctrl);
  94                 break;
  95         case NAND_CTL_CLRCLE:
  96                 __raw_writeb(__raw_readb(ctrl) & ~0x2, ctrl);
  97                 break;
  98         case NAND_CTL_SETALE:
  99                 __raw_writeb(__raw_readb(ctrl) | 0x1, ctrl);
 100                 break;
 101         case NAND_CTL_CLRALE:
 102                 __raw_writeb(__raw_readb(ctrl) & ~0x1, ctrl);
 103                 break;
 104         case NAND_CTL_SETNCE:
 105                 __raw_writeb(__raw_readb(ctrl) | 0x4, ctrl);
 106                 break;
 107         case NAND_CTL_CLRNCE:
 108                 __raw_writeb(__raw_readb(ctrl) & ~0x4, ctrl);
 109                 break;
 110         }
 111 }
 112
 113 /*
 114  *      read device ready pin
 115  */
 116 static int ts7250_device_ready(struct mtd_info *mtd)
 117 {
 118         return __raw_readb(TS72XX_NAND_BUSY_VIRT_BASE) & 0x20;
 119 }
 120
 121 /*
 122  * Main initialization routine
 123  */
 124 static int __init ts7250_init(void)
 125 {
 126         struct nand_chip *this;
 127         const char *part_type = 0;
 128         int mtd_parts_nb = 0;
 129         struct mtd_partition *mtd_parts = 0;
 130
 131         if (!machine_is_ts72xx() || board_is_ts7200())
 132                 return -ENXIO;
 133
 134         /* Allocate memory for MTD device structure and private data */
 135         ts7250_mtd = kmalloc(sizeof(struct mtd_info) +
 136                                 sizeof(struct nand_chip), GFP_KERNEL);
 137         if (!ts7250_mtd) {
 138                 printk("Unable to allocate TS7250 NAND MTD device structure.\n");
 139                 return -ENOMEM;
 140         }
 141
 142         /* Get pointer to private data */
 143         this = (struct nand_chip *)(&ts7250_mtd[1]);
 144
 145         /* Initialize structures */
 146         memset(ts7250_mtd, 0, sizeof(struct mtd_info));
 147         memset(this, 0, sizeof(struct nand_chip));
 148
 149         /* Link the private data with the MTD structure */
 150         ts7250_mtd->priv = this;
 151
 152         /* insert callbacks */
 153         this->IO_ADDR_R = (void *)TS72XX_NAND_DATA_VIRT_BASE;
 154         this->IO_ADDR_W = (void *)TS72XX_NAND_DATA_VIRT_BASE;
 155         this->hwcontrol = ts7250_hwcontrol;
 156         this->dev_ready = ts7250_device_ready;
 157         this->chip_delay = 15;
 158         this->eccmode = NAND_ECC_SOFT;
 159
 160         printk("Searching for NAND flash...\n");
 161         /* Scan to find existence of the device */
 162         if (nand_scan(ts7250_mtd, 1)) {
 163                 kfree(ts7250_mtd);
 164                 return -ENXIO;
 165         }
 166
 167 #ifdef CONFIG_MTD_PARTITIONS
 168         ts7250_mtd->name = "ts7250-nand";
 169         mtd_parts_nb = parse_mtd_partitions(ts7250_mtd, part_probes,
 170                                                 &mtd_parts, 0);
 171         if (mtd_parts_nb > 0)
 172                 part_type = "command line";
 173         else
 174                 mtd_parts_nb = 0;
 175 #endif
 176         if (mtd_parts_nb == 0) {
 177                 mtd_parts = partition_info32;
 178                 if (ts7250_mtd->size >= (128 * 0x100000))
 179                         mtd_parts = partition_info128;
 180                 mtd_parts_nb = NUM_PARTITIONS;
 181                 part_type = "static";
 182         }
 183
 184         /* Register the partitions */
 185         printk(KERN_NOTICE "Using %s partition definition\n", part_type);
 186         add_mtd_partitions(ts7250_mtd, mtd_parts, mtd_parts_nb);
 187
 188         /* Return happy */
 189         return 0;
 190 }
 191 module_init(ts7250_init);
 192
 193 /*
 194  * Clean up routine
 195  */
 196 static void __exit ts7250_cleanup(void)
 197 {
 198         /* Unregister the device */
 199         del_mtd_device(ts7250_mtd);
 200
 201         /* Free the MTD device structure */
 202         kfree(ts7250_mtd);
 203 }
 204 module_exit(ts7250_cleanup);
 205
 206 MODULE_LICENSE("GPL");
 207 MODULE_AUTHOR("Jesse Off <joff@embeddedARM.com>");
 208 MODULE_DESCRIPTION("MTD map driver for Technologic Systems TS-7250 board");