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         {
  77                 .name   = "SPIA flash partition 2",
  78                 .offset = 2*1024*1024,
  79                 .size   = 6*1024*1024
  80         }
  81 };
  82 #define NUM_PARTITIONS 2
  83
  84
  85 /*
  86  *      hardware specific access to control-lines
  87 */
  88 static void spia_hwcontrol(struct mtd_info *mtd, int cmd){
  89
  90     switch(cmd){
  91
  92         case NAND_CTL_SETCLE: (*(volatile unsigned char *) (spia_io_base + spia_pedr)) |=  0x01; break;
  93         case NAND_CTL_CLRCLE: (*(volatile unsigned char *) (spia_io_base + spia_pedr)) &= ~0x01; break;
  94
  95         case NAND_CTL_SETALE: (*(volatile unsigned char *) (spia_io_base + spia_pedr)) |=  0x02; break;
  96         case NAND_CTL_CLRALE: (*(volatile unsigned char *) (spia_io_base + spia_pedr)) &= ~0x02; break;
  97
  98         case NAND_CTL_SETNCE: (*(volatile unsigned char *) (spia_io_base + spia_pedr)) &= ~0x04; break;
  99         case NAND_CTL_CLRNCE: (*(volatile unsigned char *) (spia_io_base + spia_pedr)) |=  0x04; break;
 100     }
 101 }
 102
 103 /*
 104  * Main initialization routine
 105  */
 106 int __init spia_init (void)
 107 {
 108         struct nand_chip *this;
 109
 110         /* Allocate memory for MTD device structure and private data */
 111         spia_mtd = kmalloc (sizeof(struct mtd_info) + sizeof (struct nand_chip),
 112                                 GFP_KERNEL);
 113         if (!spia_mtd) {
 114                 printk ("Unable to allocate SPIA NAND MTD device structure.\n");
 115                 return -ENOMEM;
 116         }
 117
 118         /* Get pointer to private data */
 119         this = (struct nand_chip *) (&spia_mtd[1]);
 120
 121         /* Initialize structures */
 122         memset((char *) spia_mtd, 0, sizeof(struct mtd_info));
 123         memset((char *) this, 0, sizeof(struct nand_chip));
 124
 125         /* Link the private data with the MTD structure */
 126         spia_mtd->priv = this;
 127
 128         /*
 129          * Set GPIO Port E control register so that the pins are configured
 130          * to be outputs for controlling the NAND flash.
 131          */
 132         (*(volatile unsigned char *) (spia_io_base + spia_peddr)) = 0x07;
 133
 134         /* Set address of NAND IO lines */
 135         this->IO_ADDR_R = (void __iomem *) spia_fio_base;
 136         this->IO_ADDR_W = (void __iomem *) spia_fio_base;
 137         /* Set address of hardware control function */
 138         this->hwcontrol = spia_hwcontrol;
 139         /* 15 us command delay time */
 140         this->chip_delay = 15;
 141
 142         /* Scan to find existence of the device */
 143         if (nand_scan (spia_mtd, 1)) {
 144                 kfree (spia_mtd);
 145                 return -ENXIO;
 146         }
 147
 148         /* Register the partitions */
 149         add_mtd_partitions(spia_mtd, partition_info, NUM_PARTITIONS);
 150
 151         /* Return happy */
 152         return 0;
 153 }
 154 module_init(spia_init);
 155
 156 /*
 157  * Clean up routine
 158  */
 159 #ifdef MODULE
 160 static void __exit spia_cleanup (void)
 161 {
 162         /* Release resources, unregister device */
 163         nand_release (spia_mtd);
 164
 165         /* Free the MTD device structure */
 166         kfree (spia_mtd);
 167 }
 168 module_exit(spia_cleanup);
 169 #endif
 170
 171 MODULE_LICENSE("GPL");
 172 MODULE_AUTHOR("Steven J. Hill <sjhill@realitydiluted.com");
 173 MODULE_DESCRIPTION("Board-specific glue layer for NAND flash on SPIA board");