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 adress 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
  46 static int autcpu12_io_base = CS89712_VIRT_BASE;
  47 static int autcpu12_fio_pbase = AUTCPU12_PHYS_SMC;
  48 static int autcpu12_fio_ctrl = AUTCPU12_SMC_SELECT_OFFSET;
  49 static int autcpu12_pedr = AUTCPU12_SMC_PORT_OFFSET;
  50 static void __iomem * autcpu12_fio_base;
  51
  52 /*
  53  * Define partitions for flash devices
  54  */
  55 static struct mtd_partition partition_info16k[] = {
  56         { .name         = "AUTCPU12 flash partition 1",
  57           .offset       = 0,
  58           .size         = 8 * SZ_1M },
  59         { .name         = "AUTCPU12 flash partition 2",
  60           .offset       = 8 * SZ_1M,
  61           .size         = 8 * SZ_1M },
  62 };
  63
  64 static struct mtd_partition partition_info32k[] = {
  65         { .name         = "AUTCPU12 flash partition 1",
  66           .offset       = 0,
  67           .size         = 8 * SZ_1M },
  68         { .name         = "AUTCPU12 flash partition 2",
  69           .offset       = 8 * SZ_1M,
  70           .size         = 24 * SZ_1M },
  71 };
  72
  73 static struct mtd_partition partition_info64k[] = {
  74         { .name         = "AUTCPU12 flash partition 1",
  75           .offset       = 0,
  76           .size         = 16 * SZ_1M },
  77         { .name         = "AUTCPU12 flash partition 2",
  78           .offset       = 16 * SZ_1M,
  79           .size         = 48 * SZ_1M },
  80 };
  81
  82 static struct mtd_partition partition_info128k[] = {
  83         { .name         = "AUTCPU12 flash partition 1",
  84           .offset       = 0,
  85           .size         = 16 * SZ_1M },
  86         { .name         = "AUTCPU12 flash partition 2",
  87           .offset       = 16 * SZ_1M,
  88           .size         = 112 * SZ_1M },
  89 };
  90
  91 #define NUM_PARTITIONS16K 2
  92 #define NUM_PARTITIONS32K 2
  93 #define NUM_PARTITIONS64K 2
  94 #define NUM_PARTITIONS128K 2
  95 /*
  96  *      hardware specific access to control-lines
  97 */
  98 static void autcpu12_hwcontrol(struct mtd_info *mtd, int cmd)
  99 {
 100
 101         switch(cmd){
 102
 103                 case NAND_CTL_SETCLE: (*(volatile unsigned char *) (autcpu12_io_base + autcpu12_pedr)) |=  AUTCPU12_SMC_CLE; break;
 104                 case NAND_CTL_CLRCLE: (*(volatile unsigned char *) (autcpu12_io_base + autcpu12_pedr)) &= ~AUTCPU12_SMC_CLE; break;
 105
 106                 case NAND_CTL_SETALE: (*(volatile unsigned char *) (autcpu12_io_base + autcpu12_pedr)) |=  AUTCPU12_SMC_ALE; break;
 107                 case NAND_CTL_CLRALE: (*(volatile unsigned char *) (autcpu12_io_base + autcpu12_pedr)) &= ~AUTCPU12_SMC_ALE; break;
 108
 109                 case NAND_CTL_SETNCE: (*(volatile unsigned char *) (autcpu12_fio_base + autcpu12_fio_ctrl)) = 0x01; break;
 110                 case NAND_CTL_CLRNCE: (*(volatile unsigned char *) (autcpu12_fio_base + autcpu12_fio_ctrl)) = 0x00; break;
 111         }
 112 }
 113
 114 /*
 115 *       read device ready pin
 116 */
 117 int autcpu12_device_ready(struct mtd_info *mtd)
 118 {
 119
 120         return ( (*(volatile unsigned char *) (autcpu12_io_base + autcpu12_pedr)) & AUTCPU12_SMC_RDY) ? 1 : 0;
 121
 122 }
 123
 124 /*
 125  * Main initialization routine
 126  */
 127 int __init autcpu12_init (void)
 128 {
 129         struct nand_chip *this;
 130         int err = 0;
 131
 132         /* Allocate memory for MTD device structure and private data */
 133         autcpu12_mtd = kmalloc (sizeof(struct mtd_info) + sizeof (struct nand_chip),
 134                                 GFP_KERNEL);
 135         if (!autcpu12_mtd) {
 136                 printk ("Unable to allocate AUTCPU12 NAND MTD device structure.\n");
 137                 err = -ENOMEM;
 138                 goto out;
 139         }
 140
 141         /* map physical adress */
 142         autcpu12_fio_base = ioremap(autcpu12_fio_pbase,SZ_1K);
 143         if(!autcpu12_fio_base){
 144                 printk("Ioremap autcpu12 SmartMedia Card failed\n");
 145                 err = -EIO;
 146                 goto out_mtd;
 147         }
 148
 149         /* Get pointer to private data */
 150         this = (struct nand_chip *) (&autcpu12_mtd[1]);
 151
 152         /* Initialize structures */
 153         memset((char *) autcpu12_mtd, 0, sizeof(struct mtd_info));
 154         memset((char *) this, 0, sizeof(struct nand_chip));
 155
 156         /* Link the private data with the MTD structure */
 157         autcpu12_mtd->priv = this;
 158
 159         /* Set address of NAND IO lines */
 160         this->IO_ADDR_R = autcpu12_fio_base;
 161         this->IO_ADDR_W = autcpu12_fio_base;
 162         this->hwcontrol = autcpu12_hwcontrol;
 163         this->dev_ready = autcpu12_device_ready;
 164         /* 20 us command delay time */
 165         this->chip_delay = 20;
 166         this->eccmode = NAND_ECC_SOFT;
 167
 168         /* Enable the following for a flash based bad block table */
 169         /*
 170         this->options = NAND_USE_FLASH_BBT;
 171         */
 172         this->options = NAND_USE_FLASH_BBT;
 173
 174         /* Scan to find existance of the device */
 175         if (nand_scan (autcpu12_mtd, 1)) {
 176                 err = -ENXIO;
 177                 goto out_ior;
 178         }
 179
 180         /* Register the partitions */
 181         switch(autcpu12_mtd->size){
 182                 case SZ_16M: add_mtd_partitions(autcpu12_mtd, partition_info16k, NUM_PARTITIONS16K); break;
 183                 case SZ_32M: add_mtd_partitions(autcpu12_mtd, partition_info32k, NUM_PARTITIONS32K); break;
 184                 case SZ_64M: add_mtd_partitions(autcpu12_mtd, partition_info64k, NUM_PARTITIONS64K); break;
 185                 case SZ_128M: add_mtd_partitions(autcpu12_mtd, partition_info128k, NUM_PARTITIONS128K); break;
 186                 default: {
 187                         printk ("Unsupported SmartMedia device\n");
 188                         err = -ENXIO;
 189                         goto out_ior;
 190                 }
 191         }
 192         goto out;
 193
 194 out_ior:
 195         iounmap((void *)autcpu12_fio_base);
 196 out_mtd:
 197         kfree (autcpu12_mtd);
 198 out:
 199         return err;
 200 }
 201
 202 module_init(autcpu12_init);
 203
 204 /*
 205  * Clean up routine
 206  */
 207 #ifdef MODULE
 208 static void __exit autcpu12_cleanup (void)
 209 {
 210         /* Release resources, unregister device */
 211         nand_release (autcpu12_mtd);
 212
 213         /* unmap physical adress */
 214         iounmap((void *)autcpu12_fio_base);
 215
 216         /* Free the MTD device structure */
 217         kfree (autcpu12_mtd);
 218 }
 219 module_exit(autcpu12_cleanup);
 220 #endif
 221
 222 MODULE_LICENSE("GPL");
 223 MODULE_AUTHOR("Thomas Gleixner <tglx@linutronix.de>");
 224 MODULE_DESCRIPTION("Glue layer for SmartMediaCard on autronix autcpu12");