git.oblomov.eu Git - linux-2.6/blob - drivers/mtd/nand/autcpu12.c

   1 /*
   2  *  drivers/mtd/autcpu12.c
   3  *
   4  *  Copyright (c) 2002 Thomas Gleixner <tgxl@linutronix.de>
   5  *
   6  *  Derived from drivers/mtd/spia.c
   7  *       Copyright (C) 2000 Steven J. Hill (sjhill@realitydiluted.com)
   8  *
   9  * $Id: autcpu12.c,v 1.23 2005/11/07 11:14:30 gleixner Exp $
  10  *
  11  * This program is free software; you can redistribute it and/or modify
  12  * it under the terms of the GNU General Public License version 2 as
  13  * published by the Free Software Foundation.
  14  *
  15  *  Overview:
  16  *   This is a device driver for the NAND flash device found on the
  17  *   autronix autcpu12 board, which is a SmartMediaCard. It supports
  18  *   16MiB, 32MiB and 64MiB cards.
  19  *
  20  *
  21  *      02-12-2002 TG   Cleanup of module params
  22  *
  23  *      02-20-2002 TG   adjusted for different rd/wr address support
  24  *                      added support for read device ready/busy line
  25  *                      added page_cache
  26  *
  27  *      10-06-2002 TG   128K card support added
  28  */
  29
  30 #include <linux/slab.h>
  31 #include <linux/init.h>
  32 #include <linux/module.h>
  33 #include <linux/mtd/mtd.h>
  34 #include <linux/mtd/nand.h>
  35 #include <linux/mtd/partitions.h>
  36 #include <asm/io.h>
  37 #include <asm/arch/hardware.h>
  38 #include <asm/sizes.h>
  39 #include <asm/arch/autcpu12.h>
  40
  41 /*
  42  * MTD structure for AUTCPU12 board
  43  */
  44 static struct mtd_info *autcpu12_mtd = NULL;
  45 static void __iomem *autcpu12_fio_base;
  46
  47 /*
  48  * Define partitions for flash devices
  49  */
  50 static struct mtd_partition partition_info16k[] = {
  51         { .name         = "AUTCPU12 flash partition 1",
  52           .offset       = 0,
  53           .size         = 8 * SZ_1M },
  54         { .name         = "AUTCPU12 flash partition 2",
  55           .offset       = 8 * SZ_1M,
  56           .size         = 8 * SZ_1M },
  57 };
  58
  59 static struct mtd_partition partition_info32k[] = {
  60         { .name         = "AUTCPU12 flash partition 1",
  61           .offset       = 0,
  62           .size         = 8 * SZ_1M },
  63         { .name         = "AUTCPU12 flash partition 2",
  64           .offset       = 8 * SZ_1M,
  65           .size         = 24 * SZ_1M },
  66 };
  67
  68 static struct mtd_partition partition_info64k[] = {
  69         { .name         = "AUTCPU12 flash partition 1",
  70           .offset       = 0,
  71           .size         = 16 * SZ_1M },
  72         { .name         = "AUTCPU12 flash partition 2",
  73           .offset       = 16 * SZ_1M,
  74           .size         = 48 * SZ_1M },
  75 };
  76
  77 static struct mtd_partition partition_info128k[] = {
  78         { .name         = "AUTCPU12 flash partition 1",
  79           .offset       = 0,
  80           .size         = 16 * SZ_1M },
  81         { .name         = "AUTCPU12 flash partition 2",
  82           .offset       = 16 * SZ_1M,
  83           .size         = 112 * SZ_1M },
  84 };
  85
  86 #define NUM_PARTITIONS16K 2
  87 #define NUM_PARTITIONS32K 2
  88 #define NUM_PARTITIONS64K 2
  89 #define NUM_PARTITIONS128K 2
  90 /*
  91  *      hardware specific access to control-lines
  92  *
  93  *      ALE bit 4 autcpu12_pedr
  94  *      CLE bit 5 autcpu12_pedr
  95  *      NCE bit 0 fio_ctrl
  96  *
  97  */
  98 static void autcpu12_hwcontrol(struct mtd_info *mtd, int cmd,
  99                                unsigned int ctrl)
 100 {
 101         struct nand_chip *chip = mtd->priv;
 102
 103         if (ctrl & NAND_CTRL_CHANGE) {
 104                 void __iomem *addr;
 105                 unsigned char bits;
 106
 107                 addr = CS89712_VIRT_BASE + AUTCPU12_SMC_PORT_OFFSET;
 108                 bits = (ctrl & NAND_CLE) << 4;
 109                 bits |= (ctrl & NAND_ALE) << 2;
 110                 writeb((readb(addr) & ~0x30) | bits, addr);
 111
 112                 addr = autcpu12_fio_base + AUTCPU12_SMC_SELECT_OFFSET;
 113                 writeb((readb(addr) & ~0x1) | (ctrl & NAND_NCE), addr);
 114         }
 115
 116         if (cmd != NAND_CMD_NONE)
 117                 writeb(cmd, chip->IO_ADDR_W);
 118 }
 119
 120 /*
 121  *      read device ready pin
 122  */
 123 int autcpu12_device_ready(struct mtd_info *mtd)
 124 {
 125         void __iomem *addr = CS89712_VIRT_BASE + AUTCPU12_SMC_PORT_OFFSET;
 126
 127         return readb(addr) & AUTCPU12_SMC_RDY;
 128 }
 129
 130 /*
 131  * Main initialization routine
 132  */
 133 static int __init autcpu12_init(void)
 134 {
 135         struct nand_chip *this;
 136         int err = 0;
 137
 138         /* Allocate memory for MTD device structure and private data */
 139         autcpu12_mtd = kmalloc(sizeof(struct mtd_info) + sizeof(struct nand_chip),
 140                                GFP_KERNEL);
 141         if (!autcpu12_mtd) {
 142                 printk("Unable to allocate AUTCPU12 NAND MTD device structure.\n");
 143                 err = -ENOMEM;
 144                 goto out;
 145         }
 146
 147         /* map physical address */
 148         autcpu12_fio_base = ioremap(AUTCPU12_PHYS_SMC, SZ_1K);
 149         if (!autcpu12_fio_base) {
 150                 printk("Ioremap autcpu12 SmartMedia Card failed\n");
 151                 err = -EIO;
 152                 goto out_mtd;
 153         }
 154
 155         /* Get pointer to private data */
 156         this = (struct nand_chip *)(&autcpu12_mtd[1]);
 157
 158         /* Initialize structures */
 159         memset(autcpu12_mtd, 0, sizeof(struct mtd_info));
 160         memset(this, 0, sizeof(struct nand_chip));
 161
 162         /* Link the private data with the MTD structure */
 163         autcpu12_mtd->priv = this;
 164         autcpu12_mtd->owner = THIS_MODULE;
 165
 166         /* Set address of NAND IO lines */
 167         this->IO_ADDR_R = autcpu12_fio_base;
 168         this->IO_ADDR_W = autcpu12_fio_base;
 169         this->cmd_ctrl = autcpu12_hwcontrol;
 170         this->dev_ready = autcpu12_device_ready;
 171         /* 20 us command delay time */
 172         this->chip_delay = 20;
 173         this->ecc.mode = NAND_ECC_SOFT;
 174
 175         /* Enable the following for a flash based bad block table */
 176         /*
 177            this->options = NAND_USE_FLASH_BBT;
 178          */
 179         this->options = NAND_USE_FLASH_BBT;
 180
 181         /* Scan to find existance of the device */
 182         if (nand_scan(autcpu12_mtd, 1)) {
 183                 err = -ENXIO;
 184                 goto out_ior;
 185         }
 186
 187         /* Register the partitions */
 188         switch (autcpu12_mtd->size) {
 189                 case SZ_16M:
 190                         add_mtd_partitions(autcpu12_mtd, partition_info16k,
 191                                            NUM_PARTITIONS16K);
 192                         break;
 193                 case SZ_32M:
 194                         add_mtd_partitions(autcpu12_mtd, partition_info32k,
 195                                            NUM_PARTITIONS32K);
 196                         break;
 197                 case SZ_64M:
 198                         add_mtd_partitions(autcpu12_mtd, partition_info64k,
 199                                            NUM_PARTITIONS64K);
 200                         break;
 201                 case SZ_128M:
 202                         add_mtd_partitions(autcpu12_mtd, partition_info128k,
 203                                            NUM_PARTITIONS128K);
 204                         break;
 205                 default:
 206                         printk("Unsupported SmartMedia device\n");
 207                         err = -ENXIO;
 208                         goto out_ior;
 209         }
 210         goto out;
 211
 212  out_ior:
 213         iounmap(autcpu12_fio_base);
 214  out_mtd:
 215         kfree(autcpu12_mtd);
 216  out:
 217         return err;
 218 }
 219
 220 module_init(autcpu12_init);
 221
 222 /*
 223  * Clean up routine
 224  */
 225 static void __exit autcpu12_cleanup(void)
 226 {
 227         /* Release resources, unregister device */
 228         nand_release(autcpu12_mtd);
 229
 230         /* unmap physical address */
 231         iounmap(autcpu12_fio_base);
 232
 233         /* Free the MTD device structure */
 234         kfree(autcpu12_mtd);
 235 }
 236
 237 module_exit(autcpu12_cleanup);
 238
 239 MODULE_LICENSE("GPL");
 240 MODULE_AUTHOR("Thomas Gleixner <tglx@linutronix.de>");
 241 MODULE_DESCRIPTION("Glue layer for SmartMediaCard on autronix autcpu12");