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 1.22 2004/11/04 12:53:10 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/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 void __iomem * autcpu12_fio_base;
  52
  53 /*
  54  * Define partitions for flash devices
  55  */
  56 static struct mtd_partition partition_info16k[] = {
  57         { .name         = "AUTCPU12 flash partition 1",
  58           .offset       = 0,
  59           .size         = 8 * SZ_1M },
  60         { .name         = "AUTCPU12 flash partition 2",
  61           .offset       = 8 * SZ_1M,
  62           .size         = 8 * SZ_1M },
  63 };
  64
  65 static struct mtd_partition partition_info32k[] = {
  66         { .name         = "AUTCPU12 flash partition 1",
  67           .offset       = 0,
  68           .size         = 8 * SZ_1M },
  69         { .name         = "AUTCPU12 flash partition 2",
  70           .offset       = 8 * SZ_1M,
  71           .size         = 24 * SZ_1M },
  72 };
  73
  74 static struct mtd_partition partition_info64k[] = {
  75         { .name         = "AUTCPU12 flash partition 1",
  76           .offset       = 0,
  77           .size         = 16 * SZ_1M },
  78         { .name         = "AUTCPU12 flash partition 2",
  79           .offset       = 16 * SZ_1M,
  80           .size         = 48 * SZ_1M },
  81 };
  82
  83 static struct mtd_partition partition_info128k[] = {
  84         { .name         = "AUTCPU12 flash partition 1",
  85           .offset       = 0,
  86           .size         = 16 * SZ_1M },
  87         { .name         = "AUTCPU12 flash partition 2",
  88           .offset       = 16 * SZ_1M,
  89           .size         = 112 * SZ_1M },
  90 };
  91
  92 #define NUM_PARTITIONS16K 2
  93 #define NUM_PARTITIONS32K 2
  94 #define NUM_PARTITIONS64K 2
  95 #define NUM_PARTITIONS128K 2
  96 /*
  97  *      hardware specific access to control-lines
  98 */
  99 static void autcpu12_hwcontrol(struct mtd_info *mtd, int cmd)
 100 {
 101
 102         switch(cmd){
 103
 104                 case NAND_CTL_SETCLE: (*(volatile unsigned char *) (autcpu12_io_base + autcpu12_pedr)) |=  AUTCPU12_SMC_CLE; break;
 105                 case NAND_CTL_CLRCLE: (*(volatile unsigned char *) (autcpu12_io_base + autcpu12_pedr)) &= ~AUTCPU12_SMC_CLE; break;
 106
 107                 case NAND_CTL_SETALE: (*(volatile unsigned char *) (autcpu12_io_base + autcpu12_pedr)) |=  AUTCPU12_SMC_ALE; break;
 108                 case NAND_CTL_CLRALE: (*(volatile unsigned char *) (autcpu12_io_base + autcpu12_pedr)) &= ~AUTCPU12_SMC_ALE; break;
 109
 110                 case NAND_CTL_SETNCE: (*(volatile unsigned char *) (autcpu12_fio_base + autcpu12_fio_ctrl)) = 0x01; break;
 111                 case NAND_CTL_CLRNCE: (*(volatile unsigned char *) (autcpu12_fio_base + autcpu12_fio_ctrl)) = 0x00; break;
 112         }
 113 }
 114
 115 /*
 116 *       read device ready pin
 117 */
 118 int autcpu12_device_ready(struct mtd_info *mtd)
 119 {
 120
 121         return ( (*(volatile unsigned char *) (autcpu12_io_base + autcpu12_pedr)) & AUTCPU12_SMC_RDY) ? 1 : 0;
 122
 123 }
 124
 125 /*
 126  * Main initialization routine
 127  */
 128 int __init autcpu12_init (void)
 129 {
 130         struct nand_chip *this;
 131         int err = 0;
 132
 133         /* Allocate memory for MTD device structure and private data */
 134         autcpu12_mtd = kmalloc (sizeof(struct mtd_info) + sizeof (struct nand_chip),
 135                                 GFP_KERNEL);
 136         if (!autcpu12_mtd) {
 137                 printk ("Unable to allocate AUTCPU12 NAND MTD device structure.\n");
 138                 err = -ENOMEM;
 139                 goto out;
 140         }
 141
 142         /* map physical adress */
 143         autcpu12_fio_base = ioremap(autcpu12_fio_pbase,SZ_1K);
 144         if(!autcpu12_fio_base){
 145                 printk("Ioremap autcpu12 SmartMedia Card failed\n");
 146                 err = -EIO;
 147                 goto out_mtd;
 148         }
 149
 150         /* Get pointer to private data */
 151         this = (struct nand_chip *) (&autcpu12_mtd[1]);
 152
 153         /* Initialize structures */
 154         memset((char *) autcpu12_mtd, 0, sizeof(struct mtd_info));
 155         memset((char *) this, 0, sizeof(struct nand_chip));
 156
 157         /* Link the private data with the MTD structure */
 158         autcpu12_mtd->priv = this;
 159
 160         /* Set address of NAND IO lines */
 161         this->IO_ADDR_R = autcpu12_fio_base;
 162         this->IO_ADDR_W = autcpu12_fio_base;
 163         this->hwcontrol = autcpu12_hwcontrol;
 164         this->dev_ready = autcpu12_device_ready;
 165         /* 20 us command delay time */
 166         this->chip_delay = 20;
 167         this->eccmode = NAND_ECC_SOFT;
 168
 169         /* Enable the following for a flash based bad block table */
 170         /*
 171         this->options = NAND_USE_FLASH_BBT;
 172         */
 173         this->options = NAND_USE_FLASH_BBT;
 174
 175         /* Scan to find existance of the device */
 176         if (nand_scan (autcpu12_mtd, 1)) {
 177                 err = -ENXIO;
 178                 goto out_ior;
 179         }
 180
 181         /* Register the partitions */
 182         switch(autcpu12_mtd->size){
 183                 case SZ_16M: add_mtd_partitions(autcpu12_mtd, partition_info16k, NUM_PARTITIONS16K); break;
 184                 case SZ_32M: add_mtd_partitions(autcpu12_mtd, partition_info32k, NUM_PARTITIONS32K); break;
 185                 case SZ_64M: add_mtd_partitions(autcpu12_mtd, partition_info64k, NUM_PARTITIONS64K); break;
 186                 case SZ_128M: add_mtd_partitions(autcpu12_mtd, partition_info128k, NUM_PARTITIONS128K); break;
 187                 default: {
 188                         printk ("Unsupported SmartMedia device\n");
 189                         err = -ENXIO;
 190                         goto out_ior;
 191                 }
 192         }
 193         goto out;
 194
 195 out_ior:
 196         iounmap((void *)autcpu12_fio_base);
 197 out_mtd:
 198         kfree (autcpu12_mtd);
 199 out:
 200         return err;
 201 }
 202
 203 module_init(autcpu12_init);
 204
 205 /*
 206  * Clean up routine
 207  */
 208 #ifdef MODULE
 209 static void __exit autcpu12_cleanup (void)
 210 {
 211         /* Release resources, unregister device */
 212         nand_release (autcpu12_mtd);
 213
 214         /* unmap physical adress */
 215         iounmap((void *)autcpu12_fio_base);
 216
 217         /* Free the MTD device structure */
 218         kfree (autcpu12_mtd);
 219 }
 220 module_exit(autcpu12_cleanup);
 221 #endif
 222
 223 MODULE_LICENSE("GPL");
 224 MODULE_AUTHOR("Thomas Gleixner <tglx@linutronix.de>");
 225 MODULE_DESCRIPTION("Glue layer for SmartMediaCard on autronix autcpu12");