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 1.20 2004/07/20 02:44:26 dwmw2 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/version.h>
  31 #include <linux/slab.h>
  32 #include <linux/init.h>
  33 #include <linux/module.h>
  34 #include <linux/mtd/mtd.h>
  35 #include <linux/mtd/nand.h>
  36 #include <linux/mtd/partitions.h>
  37 #include <asm/io.h>
  38 #include <asm/arch/hardware.h>
  39 #include <asm/sizes.h>
  40 #include <asm/arch/autcpu12.h>
  41
  42 /*
  43  * MTD structure for AUTCPU12 board
  44  */
  45 static struct mtd_info *autcpu12_mtd = NULL;
  46
  47 static int autcpu12_io_base = CS89712_VIRT_BASE;
  48 static int autcpu12_fio_pbase = AUTCPU12_PHYS_SMC;
  49 static int autcpu12_fio_ctrl = AUTCPU12_SMC_SELECT_OFFSET;
  50 static int autcpu12_pedr = AUTCPU12_SMC_PORT_OFFSET;
  51 static int autcpu12_fio_base;
  52
  53 #ifdef MODULE
  54 MODULE_PARM(autcpu12_fio_pbase, "i");
  55 MODULE_PARM(autcpu12_fio_ctrl, "i");
  56 MODULE_PARM(autcpu12_pedr, "i");
  57
  58 __setup("autcpu12_fio_pbase=",autcpu12_fio_pbase);
  59 __setup("autcpu12_fio_ctrl=",autcpu12_fio_ctrl);
  60 __setup("autcpu12_pedr=",autcpu12_pedr);
  61 #endif
  62
  63 /*
  64  * Define partitions for flash devices
  65  */
  66 static struct mtd_partition partition_info16k[] = {
  67         { .name         = "AUTCPU12 flash partition 1",
  68           .offset       = 0,
  69           .size         = 8 * SZ_1M },
  70         { .name         = "AUTCPU12 flash partition 2",
  71           .offset       = 8 * SZ_1M,
  72           .size         = 8 * SZ_1M },
  73 };
  74
  75 static struct mtd_partition partition_info32k[] = {
  76         { .name         = "AUTCPU12 flash partition 1",
  77           .offset       = 0,
  78           .size         = 8 * SZ_1M },
  79         { .name         = "AUTCPU12 flash partition 2",
  80           .offset       = 8 * SZ_1M,
  81           .size         = 24 * SZ_1M },
  82 };
  83
  84 static struct mtd_partition partition_info64k[] = {
  85         { .name         = "AUTCPU12 flash partition 1",
  86           .offset       = 0,
  87           .size         = 16 * SZ_1M },
  88         { .name         = "AUTCPU12 flash partition 2",
  89           .offset       = 16 * SZ_1M,
  90           .size         = 48 * SZ_1M },
  91 };
  92
  93 static struct mtd_partition partition_info128k[] = {
  94         { .name         = "AUTCPU12 flash partition 1",
  95           .offset       = 0,
  96           .size         = 16 * SZ_1M },
  97         { .name         = "AUTCPU12 flash partition 2",
  98           .offset       = 16 * SZ_1M,
  99           .size         = 112 * SZ_1M },
 100 };
 101
 102 #define NUM_PARTITIONS16K 2
 103 #define NUM_PARTITIONS32K 2
 104 #define NUM_PARTITIONS64K 2
 105 #define NUM_PARTITIONS128K 2
 106 /*
 107  *      hardware specific access to control-lines
 108 */
 109 static void autcpu12_hwcontrol(struct mtd_info *mtd, int cmd)
 110 {
 111
 112         switch(cmd){
 113
 114                 case NAND_CTL_SETCLE: (*(volatile unsigned char *) (autcpu12_io_base + autcpu12_pedr)) |=  AUTCPU12_SMC_CLE; break;
 115                 case NAND_CTL_CLRCLE: (*(volatile unsigned char *) (autcpu12_io_base + autcpu12_pedr)) &= ~AUTCPU12_SMC_CLE; break;
 116
 117                 case NAND_CTL_SETALE: (*(volatile unsigned char *) (autcpu12_io_base + autcpu12_pedr)) |=  AUTCPU12_SMC_ALE; break;
 118                 case NAND_CTL_CLRALE: (*(volatile unsigned char *) (autcpu12_io_base + autcpu12_pedr)) &= ~AUTCPU12_SMC_ALE; break;
 119
 120                 case NAND_CTL_SETNCE: (*(volatile unsigned char *) (autcpu12_fio_base + autcpu12_fio_ctrl)) = 0x01; break;
 121                 case NAND_CTL_CLRNCE: (*(volatile unsigned char *) (autcpu12_fio_base + autcpu12_fio_ctrl)) = 0x00; break;
 122         }
 123 }
 124
 125 /*
 126 *       read device ready pin
 127 */
 128 int autcpu12_device_ready(struct mtd_info *mtd)
 129 {
 130
 131         return ( (*(volatile unsigned char *) (autcpu12_io_base + autcpu12_pedr)) & AUTCPU12_SMC_RDY) ? 1 : 0;
 132
 133 }
 134
 135 /*
 136  * Main initialization routine
 137  */
 138 int __init autcpu12_init (void)
 139 {
 140         struct nand_chip *this;
 141         int err = 0;
 142
 143         /* Allocate memory for MTD device structure and private data */
 144         autcpu12_mtd = kmalloc (sizeof(struct mtd_info) + sizeof (struct nand_chip),
 145                                 GFP_KERNEL);
 146         if (!autcpu12_mtd) {
 147                 printk ("Unable to allocate AUTCPU12 NAND MTD device structure.\n");
 148                 err = -ENOMEM;
 149                 goto out;
 150         }
 151
 152         /* map physical adress */
 153         autcpu12_fio_base=(unsigned long)ioremap(autcpu12_fio_pbase,SZ_1K);
 154         if(!autcpu12_fio_base){
 155                 printk("Ioremap autcpu12 SmartMedia Card failed\n");
 156                 err = -EIO;
 157                 goto out_mtd;
 158         }
 159
 160         /* Get pointer to private data */
 161         this = (struct nand_chip *) (&autcpu12_mtd[1]);
 162
 163         /* Initialize structures */
 164         memset((char *) autcpu12_mtd, 0, sizeof(struct mtd_info));
 165         memset((char *) this, 0, sizeof(struct nand_chip));
 166
 167         /* Link the private data with the MTD structure */
 168         autcpu12_mtd->priv = this;
 169
 170         /* Set address of NAND IO lines */
 171         this->IO_ADDR_R = autcpu12_fio_base;
 172         this->IO_ADDR_W = autcpu12_fio_base;
 173         this->hwcontrol = autcpu12_hwcontrol;
 174         this->dev_ready = autcpu12_device_ready;
 175         /* 20 us command delay time */
 176         this->chip_delay = 20;
 177         this->eccmode = NAND_ECC_SOFT;
 178
 179         /* Enable the following for a flash based bad block table */
 180         /*
 181         this->options = NAND_USE_FLASH_BBT;
 182         */
 183         this->options = NAND_USE_FLASH_BBT;
 184
 185         /* Scan to find existance of the device */
 186         if (nand_scan (autcpu12_mtd, 1)) {
 187                 err = -ENXIO;
 188                 goto out_ior;
 189         }
 190
 191         /* Register the partitions */
 192         switch(autcpu12_mtd->size){
 193                 case SZ_16M: add_mtd_partitions(autcpu12_mtd, partition_info16k, NUM_PARTITIONS16K); break;
 194                 case SZ_32M: add_mtd_partitions(autcpu12_mtd, partition_info32k, NUM_PARTITIONS32K); break;
 195                 case SZ_64M: add_mtd_partitions(autcpu12_mtd, partition_info64k, NUM_PARTITIONS64K); break;
 196                 case SZ_128M: add_mtd_partitions(autcpu12_mtd, partition_info128k, NUM_PARTITIONS128K); break;
 197                 default: {
 198                         printk ("Unsupported SmartMedia device\n");
 199                         err = -ENXIO;
 200                         goto out_ior;
 201                 }
 202         }
 203         goto out;
 204
 205 out_ior:
 206         iounmap((void *)autcpu12_fio_base);
 207 out_mtd:
 208         kfree (autcpu12_mtd);
 209 out:
 210         return err;
 211 }
 212
 213 module_init(autcpu12_init);
 214
 215 /*
 216  * Clean up routine
 217  */
 218 #ifdef MODULE
 219 static void __exit autcpu12_cleanup (void)
 220 {
 221         /* Release resources, unregister device */
 222         nand_release (autcpu12_mtd);
 223
 224         /* unmap physical adress */
 225         iounmap((void *)autcpu12_fio_base);
 226
 227         /* Free the MTD device structure */
 228         kfree (autcpu12_mtd);
 229 }
 230 module_exit(autcpu12_cleanup);
 231 #endif
 232
 233 MODULE_LICENSE("GPL");
 234 MODULE_AUTHOR("Thomas Gleixner <tglx@linutronix.de>");
 235 MODULE_DESCRIPTION("Glue layer for SmartMediaCard on autronix autcpu12");