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 #define NUM_PARTITIONS 1
  70
  71 #endif
  72
  73
  74 /*
  75  *      hardware specific access to control-lines
  76  */
  77 static void ep7312_hwcontrol(struct mtd_info *mtd, int cmd)
  78 {
  79         switch(cmd) {
  80
  81         case NAND_CTL_SETCLE:
  82                 clps_writeb(clps_readb(ep7312_pxdr) | 0x10, ep7312_pxdr);
  83                 break;
  84         case NAND_CTL_CLRCLE:
  85                 clps_writeb(clps_readb(ep7312_pxdr) & ~0x10, ep7312_pxdr);
  86                 break;
  87
  88         case NAND_CTL_SETALE:
  89                 clps_writeb(clps_readb(ep7312_pxdr) | 0x20, ep7312_pxdr);
  90                 break;
  91         case NAND_CTL_CLRALE:
  92                 clps_writeb(clps_readb(ep7312_pxdr) & ~0x20, ep7312_pxdr);
  93                 break;
  94
  95         case NAND_CTL_SETNCE:
  96                 clps_writeb((clps_readb(ep7312_pxdr) | 0x80) & ~0x40, ep7312_pxdr);
  97                 break;
  98         case NAND_CTL_CLRNCE:
  99                 clps_writeb((clps_readb(ep7312_pxdr) | 0x80) | 0x40, ep7312_pxdr);
 100                 break;
 101         }
 102 }
 103
 104 /*
 105  *      read device ready pin
 106  */
 107 static int ep7312_device_ready(struct mtd_info *mtd)
 108 {
 109         return 1;
 110 }
 111 #ifdef CONFIG_MTD_PARTITIONS
 112 const char *part_probes[] = { "cmdlinepart", NULL };
 113 #endif
 114
 115 /*
 116  * Main initialization routine
 117  */
 118 static int __init ep7312_init (void)
 119 {
 120         struct nand_chip *this;
 121         const char *part_type = 0;
 122         int mtd_parts_nb = 0;
 123         struct mtd_partition *mtd_parts = 0;
 124         void __iomem * ep7312_fio_base;
 125
 126         /* Allocate memory for MTD device structure and private data */
 127         ep7312_mtd = kmalloc(sizeof(struct mtd_info) +
 128                              sizeof(struct nand_chip),
 129                              GFP_KERNEL);
 130         if (!ep7312_mtd) {
 131                 printk("Unable to allocate EDB7312 NAND MTD device structure.\n");
 132                 return -ENOMEM;
 133         }
 134
 135         /* map physical adress */
 136         ep7312_fio_base = ioremap(ep7312_fio_pbase, SZ_1K);
 137         if(!ep7312_fio_base) {
 138                 printk("ioremap EDB7312 NAND flash failed\n");
 139                 kfree(ep7312_mtd);
 140                 return -EIO;
 141         }
 142
 143         /* Get pointer to private data */
 144         this = (struct nand_chip *) (&ep7312_mtd[1]);
 145
 146         /* Initialize structures */
 147         memset((char *) ep7312_mtd, 0, sizeof(struct mtd_info));
 148         memset((char *) this, 0, sizeof(struct nand_chip));
 149
 150         /* Link the private data with the MTD structure */
 151         ep7312_mtd->priv = this;
 152
 153         /*
 154          * Set GPIO Port B control register so that the pins are configured
 155          * to be outputs for controlling the NAND flash.
 156          */
 157         clps_writeb(0xf0, ep7312_pxddr);
 158
 159         /* insert callbacks */
 160         this->IO_ADDR_R = ep7312_fio_base;
 161         this->IO_ADDR_W = ep7312_fio_base;
 162         this->hwcontrol = ep7312_hwcontrol;
 163         this->dev_ready = ep7312_device_ready;
 164         /* 15 us command delay time */
 165         this->chip_delay = 15;
 166
 167         /* Scan to find existence of the device */
 168         if (nand_scan (ep7312_mtd, 1)) {
 169                 iounmap((void *)ep7312_fio_base);
 170                 kfree (ep7312_mtd);
 171                 return -ENXIO;
 172         }
 173
 174 #ifdef CONFIG_MTD_PARTITIONS
 175         ep7312_mtd->name = "edb7312-nand";
 176         mtd_parts_nb = parse_mtd_partitions(ep7312_mtd, part_probes,
 177                                             &mtd_parts, 0);
 178         if (mtd_parts_nb > 0)
 179                 part_type = "command line";
 180         else
 181                 mtd_parts_nb = 0;
 182 #endif
 183         if (mtd_parts_nb == 0) {
 184                 mtd_parts = partition_info;
 185                 mtd_parts_nb = NUM_PARTITIONS;
 186                 part_type = "static";
 187         }
 188
 189         /* Register the partitions */
 190         printk(KERN_NOTICE "Using %s partition definition\n", part_type);
 191         add_mtd_partitions(ep7312_mtd, mtd_parts, mtd_parts_nb);
 192
 193         /* Return happy */
 194         return 0;
 195 }
 196 module_init(ep7312_init);
 197
 198 /*
 199  * Clean up routine
 200  */
 201 static void __exit ep7312_cleanup (void)
 202 {
 203         struct nand_chip *this = (struct nand_chip *) &ep7312_mtd[1];
 204
 205         /* Release resources, unregister device */
 206         nand_release (ap7312_mtd);
 207
 208         /* Free internal data buffer */
 209         kfree (this->data_buf);
 210
 211         /* Free the MTD device structure */
 212         kfree (ep7312_mtd);
 213 }
 214 module_exit(ep7312_cleanup);
 215
 216 MODULE_LICENSE("GPL");
 217 MODULE_AUTHOR("Marius Groeger <mag@sysgo.de>");
 218 MODULE_DESCRIPTION("MTD map driver for Cogent EDB7312 board");