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