release/src-rt-6.x/linux/linux-2.6/drivers/mtd/nand/edb7312.c

   1 /*
   2  *  drivers/mtd/nand/edb7312.c
   3  *
   4  *  Copyright (C) 2002 Marius Gröger (mag@sysgo.de)
   5  *
   6  *  Derived from drivers/mtd/nand/autcpu12.c
   7  *       Copyright (c) 2001 Thomas Gleixner (gleixner@autronix.de)
   8  *
   9  * $Id: edb7312.c,v 1.12 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  *   CLEP7312 board which utilizes the Toshiba TC58V64AFT part. This is
  18  *   a 64Mibit (8MiB x 8 bits) NAND flash device.
  19  */
  20
  21 #include <linux/slab.h>
  22 #include <linux/module.h>
  23 #include <linux/init.h>
  24 #include <linux/mtd/mtd.h>
  25 #include <linux/mtd/nand.h>
  26 #include <linux/mtd/partitions.h>
  27 #include <asm/io.h>
  28 #include <asm/arch/hardware.h>  /* for CLPS7111_VIRT_BASE */
  29 #include <asm/sizes.h>
  30 #include <asm/hardware/clps7111.h>
  31
  32 /*
  33  * MTD structure for EDB7312 board
  34  */
  35 static struct mtd_info *ep7312_mtd = NULL;
  36
  37 /*
  38  * Values specific to the EDB7312 board (used with EP7312 processor)
  39  */
  40 #define EP7312_FIO_PBASE 0x10000000     /* Phys address of flash */
  41 #define EP7312_PXDR     0x0001  /*
  42                                  * IO offset to Port B data register
  43                                  * where the CLE, ALE and NCE pins
  44                                  * are wired to.
  45                                  */
  46 #define EP7312_PXDDR    0x0041  /*
  47                                  * IO offset to Port B data direction
  48                                  * register so we can control the IO
  49                                  * lines.
  50                                  */
  51
  52 /*
  53  * Module stuff
  54  */
  55
  56 static unsigned long ep7312_fio_pbase = EP7312_FIO_PBASE;
  57 static void __iomem *ep7312_pxdr = (void __iomem *)EP7312_PXDR;
  58 static void __iomem *ep7312_pxddr = (void __iomem *)EP7312_PXDDR;
  59
  60 #ifdef CONFIG_MTD_PARTITIONS
  61 /*
  62  * Define static partitions for flash device
  63  */
  64 static struct mtd_partition partition_info[] = {
  65         {.name = "EP7312 Nand Flash",
  66          .offset = 0,
  67          .size = 8 * 1024 * 1024}
  68 };
  69
  70 #define NUM_PARTITIONS 1
  71
  72 #endif
  73
  74 /*
  75  *      hardware specific access to control-lines
  76  *
  77  *      NAND_NCE: bit 0 -> bit 7
  78  *      NAND_CLE: bit 1 -> bit 4
  79  *      NAND_ALE: bit 2 -> bit 5
  80  */
  81 static void ep7312_hwcontrol(struct mtd_info *mtd, int cmd, unsigned int ctrl)
  82 {
  83         struct nand_chip *chip = mtd->priv;
  84
  85         if (ctrl & NAND_CTRL_CHANGE) {
  86                 unsigned char bits;
  87
  88                 bits = (ctrl & (NAND_CLE | NAND_ALE)) << 3;
  89                 bits = (ctrl & NAND_NCE) << 7;
  90
  91                 clps_writeb((clps_readb(ep7312_pxdr)  & 0xB0) | 0x10,
  92                             ep7312_pxdr);
  93         }
  94         if (cmd != NAND_CMD_NONE)
  95                 writeb(cmd, chip->IO_ADDR_W);
  96 }
  97
  98 /*
  99  *      read device ready pin
 100  */
 101 static int ep7312_device_ready(struct mtd_info *mtd)
 102 {
 103         return 1;
 104 }
 105
 106 #ifdef CONFIG_MTD_PARTITIONS
 107 const char *part_probes[] = { "cmdlinepart", NULL };
 108 #endif
 109
 110 /*
 111  * Main initialization routine
 112  */
 113 static int __init ep7312_init(void)
 114 {
 115         struct nand_chip *this;
 116         const char *part_type = 0;
 117         int mtd_parts_nb = 0;
 118         struct mtd_partition *mtd_parts = 0;
 119         void __iomem *ep7312_fio_base;
 120
 121         /* Allocate memory for MTD device structure and private data */
 122         ep7312_mtd = kmalloc(sizeof(struct mtd_info) + sizeof(struct nand_chip), GFP_KERNEL);
 123         if (!ep7312_mtd) {
 124                 printk("Unable to allocate EDB7312 NAND MTD device structure.\n");
 125                 return -ENOMEM;
 126         }
 127
 128         /* map physical adress */
 129         ep7312_fio_base = ioremap(ep7312_fio_pbase, SZ_1K);
 130         if (!ep7312_fio_base) {
 131                 printk("ioremap EDB7312 NAND flash failed\n");
 132                 kfree(ep7312_mtd);
 133                 return -EIO;
 134         }
 135
 136         /* Get pointer to private data */
 137         this = (struct nand_chip *)(&ep7312_mtd[1]);
 138
 139         /* Initialize structures */
 140         memset(ep7312_mtd, 0, sizeof(struct mtd_info));
 141         memset(this, 0, sizeof(struct nand_chip));
 142
 143         /* Link the private data with the MTD structure */
 144         ep7312_mtd->priv = this;
 145         ep7312_mtd->owner = THIS_MODULE;
 146
 147         /*
 148          * Set GPIO Port B control register so that the pins are configured
 149          * to be outputs for controlling the NAND flash.
 150          */
 151         clps_writeb(0xf0, ep7312_pxddr);
 152
 153         /* insert callbacks */
 154         this->IO_ADDR_R = ep7312_fio_base;
 155         this->IO_ADDR_W = ep7312_fio_base;
 156         this->cmd_ctrl = ep7312_hwcontrol;
 157         this->dev_ready = ep7312_device_ready;
 158         /* 15 us command delay time */
 159         this->chip_delay = 15;
 160
 161         /* Scan to find existence of the device */
 162         if (nand_scan(ep7312_mtd, 1)) {
 163                 iounmap((void *)ep7312_fio_base);
 164                 kfree(ep7312_mtd);
 165                 return -ENXIO;
 166         }
 167 #ifdef CONFIG_MTD_PARTITIONS
 168         ep7312_mtd->name = "edb7312-nand";
 169         mtd_parts_nb = parse_mtd_partitions(ep7312_mtd, part_probes, &mtd_parts, 0);
 170         if (mtd_parts_nb > 0)
 171                 part_type = "command line";
 172         else
 173                 mtd_parts_nb = 0;
 174 #endif
 175         if (mtd_parts_nb == 0) {
 176                 mtd_parts = partition_info;
 177                 mtd_parts_nb = NUM_PARTITIONS;
 178                 part_type = "static";
 179         }
 180
 181         /* Register the partitions */
 182         printk(KERN_NOTICE "Using %s partition definition\n", part_type);
 183         add_mtd_partitions(ep7312_mtd, mtd_parts, mtd_parts_nb);
 184
 185         /* Return happy */
 186         return 0;
 187 }
 188
 189 module_init(ep7312_init);
 190
 191 /*
 192  * Clean up routine
 193  */
 194 static void __exit ep7312_cleanup(void)
 195 {
 196         struct nand_chip *this = (struct nand_chip *)&ep7312_mtd[1];
 197
 198         /* Release resources, unregister device */
 199         nand_release(ap7312_mtd);
 200
 201         /* Release io resource */
 202         iounmap(this->IO_ADDR_R);
 203
 204         /* Free the MTD device structure */
 205         kfree(ep7312_mtd);
 206 }
 207
 208 module_exit(ep7312_cleanup);
 209
 210 MODULE_LICENSE("GPL");
 211 MODULE_AUTHOR("Marius Groeger <mag@sysgo.de>");
 212 MODULE_DESCRIPTION("MTD map driver for Cogent EDB7312 board");