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 1.19 2004/07/12 15:02:15 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 /*
  48  * Module stuff
  49  */
  50 #if LINUX_VERSION_CODE < 0x20212 && defined(MODULE)
  51 #define autcpu12_init init_module
  52 #define autcpu12_cleanup cleanup_module
  53 #endif
  54
  55 static int autcpu12_io_base = CS89712_VIRT_BASE;
  56 static int autcpu12_fio_pbase = AUTCPU12_PHYS_SMC;
  57 static int autcpu12_fio_ctrl = AUTCPU12_SMC_SELECT_OFFSET;
  58 static int autcpu12_pedr = AUTCPU12_SMC_PORT_OFFSET;
  59 static int autcpu12_fio_base;
  60
  61 #ifdef MODULE
  62 MODULE_PARM(autcpu12_fio_pbase, "i");
  63 MODULE_PARM(autcpu12_fio_ctrl, "i");
  64 MODULE_PARM(autcpu12_pedr, "i");
  65
  66 __setup("autcpu12_fio_pbase=",autcpu12_fio_pbase);
  67 __setup("autcpu12_fio_ctrl=",autcpu12_fio_ctrl);
  68 __setup("autcpu12_pedr=",autcpu12_pedr);
  69 #endif
  70
  71 /*
  72  * Define partitions for flash devices
  73  */
  74 static struct mtd_partition partition_info16k[] = {
  75         { .name         = "AUTCPU12 flash partition 1",
  76           .offset       = 0,
  77           .size         = 8 * SZ_1M },
  78         { .name         = "AUTCPU12 flash partition 2",
  79           .offset       = 8 * SZ_1M,
  80           .size         = 8 * SZ_1M },
  81 };
  82
  83 static struct mtd_partition partition_info32k[] = {
  84         { .name         = "AUTCPU12 flash partition 1",
  85           .offset       = 0,
  86           .size         = 8 * SZ_1M },
  87         { .name         = "AUTCPU12 flash partition 2",
  88           .offset       = 8 * SZ_1M,
  89           .size         = 24 * SZ_1M },
  90 };
  91
  92 static struct mtd_partition partition_info64k[] = {
  93         { .name         = "AUTCPU12 flash partition 1",
  94           .offset       = 0,
  95           .size         = 16 * SZ_1M },
  96         { .name         = "AUTCPU12 flash partition 2",
  97           .offset       = 16 * SZ_1M,
  98           .size         = 48 * SZ_1M },
  99 };
 100
 101 static struct mtd_partition partition_info128k[] = {
 102         { .name         = "AUTCPU12 flash partition 1",
 103           .offset       = 0,
 104           .size         = 16 * SZ_1M },
 105         { .name         = "AUTCPU12 flash partition 2",
 106           .offset       = 16 * SZ_1M,
 107           .size         = 112 * SZ_1M },
 108 };
 109
 110 #define NUM_PARTITIONS16K 2
 111 #define NUM_PARTITIONS32K 2
 112 #define NUM_PARTITIONS64K 2
 113 #define NUM_PARTITIONS128K 2
 114 /*
 115  *      hardware specific access to control-lines
 116 */
 117 static void autcpu12_hwcontrol(struct mtd_info *mtd, int cmd)
 118 {
 119
 120         switch(cmd){
 121
 122                 case NAND_CTL_SETCLE: (*(volatile unsigned char *) (autcpu12_io_base + autcpu12_pedr)) |=  AUTCPU12_SMC_CLE; break;
 123                 case NAND_CTL_CLRCLE: (*(volatile unsigned char *) (autcpu12_io_base + autcpu12_pedr)) &= ~AUTCPU12_SMC_CLE; break;
 124
 125                 case NAND_CTL_SETALE: (*(volatile unsigned char *) (autcpu12_io_base + autcpu12_pedr)) |=  AUTCPU12_SMC_ALE; break;
 126                 case NAND_CTL_CLRALE: (*(volatile unsigned char *) (autcpu12_io_base + autcpu12_pedr)) &= ~AUTCPU12_SMC_ALE; break;
 127
 128                 case NAND_CTL_SETNCE: (*(volatile unsigned char *) (autcpu12_fio_base + autcpu12_fio_ctrl)) = 0x01; break;
 129                 case NAND_CTL_CLRNCE: (*(volatile unsigned char *) (autcpu12_fio_base + autcpu12_fio_ctrl)) = 0x00; break;
 130         }
 131 }
 132
 133 /*
 134 *       read device ready pin
 135 */
 136 int autcpu12_device_ready(struct mtd_info *mtd)
 137 {
 138
 139         return ( (*(volatile unsigned char *) (autcpu12_io_base + autcpu12_pedr)) & AUTCPU12_SMC_RDY) ? 1 : 0;
 140
 141 }
 142
 143 /*
 144  * Main initialization routine
 145  */
 146 int __init autcpu12_init (void)
 147 {
 148         struct nand_chip *this;
 149         int err = 0;
 150
 151         /* Allocate memory for MTD device structure and private data */
 152         autcpu12_mtd = kmalloc (sizeof(struct mtd_info) + sizeof (struct nand_chip),
 153                                 GFP_KERNEL);
 154         if (!autcpu12_mtd) {
 155                 printk ("Unable to allocate AUTCPU12 NAND MTD device structure.\n");
 156                 err = -ENOMEM;
 157                 goto out;
 158         }
 159
 160         /* map physical adress */
 161         autcpu12_fio_base=(unsigned long)ioremap(autcpu12_fio_pbase,SZ_1K);
 162         if(!autcpu12_fio_base){
 163                 printk("Ioremap autcpu12 SmartMedia Card failed\n");
 164                 err = -EIO;
 165                 goto out_mtd;
 166         }
 167
 168         /* Get pointer to private data */
 169         this = (struct nand_chip *) (&autcpu12_mtd[1]);
 170
 171         /* Initialize structures */
 172         memset((char *) autcpu12_mtd, 0, sizeof(struct mtd_info));
 173         memset((char *) this, 0, sizeof(struct nand_chip));
 174
 175         /* Link the private data with the MTD structure */
 176         autcpu12_mtd->priv = this;
 177
 178         /* Set address of NAND IO lines */
 179         this->IO_ADDR_R = autcpu12_fio_base;
 180         this->IO_ADDR_W = autcpu12_fio_base;
 181         this->hwcontrol = autcpu12_hwcontrol;
 182         this->dev_ready = autcpu12_device_ready;
 183         /* 20 us command delay time */
 184         this->chip_delay = 20;
 185         this->eccmode = NAND_ECC_SOFT;
 186
 187         /* Enable the following for a flash based bad block table */
 188         /*
 189         this->options = NAND_USE_FLASH_BBT;
 190         */
 191         this->options = NAND_USE_FLASH_BBT;
 192
 193         /* Scan to find existance of the device */
 194         if (nand_scan (autcpu12_mtd, 1)) {
 195                 err = -ENXIO;
 196                 goto out_ior;
 197         }
 198
 199         /* Register the partitions */
 200         switch(autcpu12_mtd->size){
 201                 case SZ_16M: add_mtd_partitions(autcpu12_mtd, partition_info16k, NUM_PARTITIONS16K); break;
 202                 case SZ_32M: add_mtd_partitions(autcpu12_mtd, partition_info32k, NUM_PARTITIONS32K); break;
 203                 case SZ_64M: add_mtd_partitions(autcpu12_mtd, partition_info64k, NUM_PARTITIONS64K); break;
 204                 case SZ_128M: add_mtd_partitions(autcpu12_mtd, partition_info128k, NUM_PARTITIONS128K); break;
 205                 default: {
 206                         printk ("Unsupported SmartMedia device\n");
 207                         err = -ENXIO;
 208                         goto out_ior;
 209                 }
 210         }
 211         goto out;
 212
 213 out_ior:
 214         iounmap((void *)autcpu12_fio_base);
 215 out_mtd:
 216         kfree (autcpu12_mtd);
 217 out:
 218         return err;
 219 }
 220
 221 module_init(autcpu12_init);
 222
 223 /*
 224  * Clean up routine
 225  */
 226 #ifdef MODULE
 227 static void __exit autcpu12_cleanup (void)
 228 {
 229         /* Release resources, unregister device */
 230         nand_release (autcpu12_mtd);
 231
 232         /* unmap physical adress */
 233         iounmap((void *)autcpu12_fio_base);
 234
 235         /* Free the MTD device structure */
 236         kfree (autcpu12_mtd);
 237 }
 238 module_exit(autcpu12_cleanup);
 239 #endif
 240
 241 MODULE_LICENSE("GPL");
 242 MODULE_AUTHOR("Thomas Gleixner <tglx@linutronix.de>");
 243 MODULE_DESCRIPTION("Glue layer for SmartMediaCard on autronix autcpu12");