drivers/mtd/nand/spia.c

   1 /*
   2  *  drivers/mtd/nand/spia.c
   3  *
   4  *  Copyright (C) 2000 Steven J. Hill (sjhill@realitydiluted.com)
   5  *
   6  *
   7  *      10-29-2001 TG   change to support hardwarespecific access
   8  *                      to controllines (due to change in nand.c)
   9  *                      page_cache added
  10  *
  11  * $Id: spia.c,v 1.25 2005/11/07 11:14:31 gleixner Exp $
  12  *
  13  * This program is free software; you can redistribute it and/or modify
  14  * it under the terms of the GNU General Public License version 2 as
  15  * published by the Free Software Foundation.
  16  *
  17  *  Overview:
  18  *   This is a device driver for the NAND flash device found on the
  19  *   SPIA board which utilizes the Toshiba TC58V64AFT part. This is
  20  *   a 64Mibit (8MiB x 8 bits) NAND flash device.
  21  */
  22
  23 #include <linux/kernel.h>
  24 #include <linux/init.h>
  25 #include <linux/slab.h>
  26 #include <linux/module.h>
  27 #include <linux/mtd/mtd.h>
  28 #include <linux/mtd/nand.h>
  29 #include <linux/mtd/partitions.h>
  30 #include <asm/io.h>
  31
  32 /*
  33  * MTD structure for SPIA board
  34  */
  35 static struct mtd_info *spia_mtd = NULL;
  36
  37 /*
  38  * Values specific to the SPIA board (used with EP7212 processor)
  39  */
  40 #define SPIA_IO_BASE    0xd0000000      /* Start of EP7212 IO address space */
  41 #define SPIA_FIO_BASE   0xf0000000      /* Address where flash is mapped */
  42 #define SPIA_PEDR       0x0080  /*
  43                                  * IO offset to Port E data register
  44                                  * where the CLE, ALE and NCE pins
  45                                  * are wired to.
  46                                  */
  47 #define SPIA_PEDDR      0x00c0  /*
  48                                  * IO offset to Port E data direction
  49                                  * register so we can control the IO
  50                                  * lines.
  51                                  */
  52
  53 /*
  54  * Module stuff
  55  */
  56
  57 static int spia_io_base = SPIA_IO_BASE;
  58 static int spia_fio_base = SPIA_FIO_BASE;
  59 static int spia_pedr = SPIA_PEDR;
  60 static int spia_peddr = SPIA_PEDDR;
  61
  62 module_param(spia_io_base, int, 0);
  63 module_param(spia_fio_base, int, 0);
  64 module_param(spia_pedr, int, 0);
  65 module_param(spia_peddr, int, 0);
  66
  67 /*
  68  * Define partitions for flash device
  69  */
  70 static const struct mtd_partition partition_info[] = {
  71         {
  72          .name = "SPIA flash partition 1",
  73          .offset = 0,
  74          .size = 2 * 1024 * 1024},
  75         {
  76          .name = "SPIA flash partition 2",
  77          .offset = 2 * 1024 * 1024,
  78          .size = 6 * 1024 * 1024}
  79 };
  80
  81 #define NUM_PARTITIONS 2
  82
  83 /*
  84  *      hardware specific access to control-lines
  85 */
  86 static void spia_hwcontrol(struct mtd_info *mtd, int cmd)
  87 {
  88         switch (cmd) {
  89
  90         case NAND_CTL_SETCLE: (*(volatile unsigned char *) (spia_io_base + spia_pedr)) |=  0x01; break;
  91         case NAND_CTL_CLRCLE: (*(volatile unsigned char *) (spia_io_base + spia_pedr)) &= ~0x01; break;
  92
  93         case NAND_CTL_SETALE: (*(volatile unsigned char *) (spia_io_base + spia_pedr)) |=  0x02; break;
  94         case NAND_CTL_CLRALE: (*(volatile unsigned char *) (spia_io_base + spia_pedr)) &= ~0x02; break;
  95
  96         case NAND_CTL_SETNCE: (*(volatile unsigned char *) (spia_io_base + spia_pedr)) &= ~0x04; break;
  97         case NAND_CTL_CLRNCE: (*(volatile unsigned char *) (spia_io_base + spia_pedr)) |=  0x04; break;
  98         }
  99 }
 100
 101 /*
 102  * Main initialization routine
 103  */
 104 static int __init spia_init(void)
 105 {
 106         struct nand_chip *this;
 107
 108         /* Allocate memory for MTD device structure and private data */
 109         spia_mtd = kmalloc(sizeof(struct mtd_info) + sizeof(struct nand_chip), GFP_KERNEL);
 110         if (!spia_mtd) {
 111                 printk("Unable to allocate SPIA NAND MTD device structure.\n");
 112                 return -ENOMEM;
 113         }
 114
 115         /* Get pointer to private data */
 116         this = (struct nand_chip *)(&spia_mtd[1]);
 117
 118         /* Initialize structures */
 119         memset(spia_mtd, 0, sizeof(struct mtd_info));
 120         memset(this, 0, sizeof(struct nand_chip));
 121
 122         /* Link the private data with the MTD structure */
 123         spia_mtd->priv = this;
 124         spia_mtd->owner = THIS_MODULE;
 125
 126         /*
 127          * Set GPIO Port E control register so that the pins are configured
 128          * to be outputs for controlling the NAND flash.
 129          */
 130         (*(volatile unsigned char *)(spia_io_base + spia_peddr)) = 0x07;
 131
 132         /* Set address of NAND IO lines */
 133         this->IO_ADDR_R = (void __iomem *)spia_fio_base;
 134         this->IO_ADDR_W = (void __iomem *)spia_fio_base;
 135         /* Set address of hardware control function */
 136         this->hwcontrol = spia_hwcontrol;
 137         /* 15 us command delay time */
 138         this->chip_delay = 15;
 139
 140         /* Scan to find existence of the device */
 141         if (nand_scan(spia_mtd, 1)) {
 142                 kfree(spia_mtd);
 143                 return -ENXIO;
 144         }
 145
 146         /* Register the partitions */
 147         add_mtd_partitions(spia_mtd, partition_info, NUM_PARTITIONS);
 148
 149         /* Return happy */
 150         return 0;
 151 }
 152
 153 module_init(spia_init);
 154
 155 /*
 156  * Clean up routine
 157  */
 158 static void __exit spia_cleanup(void)
 159 {
 160         /* Release resources, unregister device */
 161         nand_release(spia_mtd);
 162
 163         /* Free the MTD device structure */
 164         kfree(spia_mtd);
 165 }
 166
 167 module_exit(spia_cleanup);
 168
 169 MODULE_LICENSE("GPL");
 170 MODULE_AUTHOR("Steven J. Hill <sjhill@realitydiluted.com");
 171 MODULE_DESCRIPTION("Board-specific glue layer for NAND flash on SPIA board");