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 1.8 2004/07/12 15:03:26 dwmw2 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 int ep7312_fio_pbase = EP7312_FIO_PBASE;
  57 static int ep7312_pxdr = EP7312_PXDR;
  58 static int ep7312_pxddr = EP7312_PXDDR;
  59
  60 #ifdef MODULE
  61 MODULE_PARM(ep7312_fio_pbase, "i");
  62 MODULE_PARM(ep7312_pxdr, "i");
  63 MODULE_PARM(ep7312_pxddr, "i");
  64
  65 __setup("ep7312_fio_pbase=",ep7312_fio_pbase);
  66 __setup("ep7312_pxdr=",ep7312_pxdr);
  67 __setup("ep7312_pxddr=",ep7312_pxddr);
  68 #endif
  69
  70 #ifdef CONFIG_MTD_PARTITIONS
  71 /*
  72  * Define static partitions for flash device
  73  */
  74 static struct mtd_partition partition_info[] = {
  75         { .name = "EP7312 Nand Flash",
  76                   .offset = 0,
  77                   .size = 8*1024*1024 }
  78 };
  79 #define NUM_PARTITIONS 1
  80
  81 #endif
  82
  83
  84 /*
  85  *      hardware specific access to control-lines
  86  */
  87 static void ep7312_hwcontrol(struct mtd_info *mtd, int cmd)
  88 {
  89         switch(cmd) {
  90
  91         case NAND_CTL_SETCLE:
  92                 clps_writeb(clps_readb(ep7312_pxdr) | 0x10, ep7312_pxdr);
  93                 break;
  94         case NAND_CTL_CLRCLE:
  95                 clps_writeb(clps_readb(ep7312_pxdr) & ~0x10, ep7312_pxdr);
  96                 break;
  97
  98         case NAND_CTL_SETALE:
  99                 clps_writeb(clps_readb(ep7312_pxdr) | 0x20, ep7312_pxdr);
 100                 break;
 101         case NAND_CTL_CLRALE:
 102                 clps_writeb(clps_readb(ep7312_pxdr) & ~0x20, ep7312_pxdr);
 103                 break;
 104
 105         case NAND_CTL_SETNCE:
 106                 clps_writeb((clps_readb(ep7312_pxdr) | 0x80) & ~0x40, ep7312_pxdr);
 107                 break;
 108         case NAND_CTL_CLRNCE:
 109                 clps_writeb((clps_readb(ep7312_pxdr) | 0x80) | 0x40, ep7312_pxdr);
 110                 break;
 111         }
 112 }
 113
 114 /*
 115  *      read device ready pin
 116  */
 117 static int ep7312_device_ready(struct mtd_info *mtd)
 118 {
 119         return 1;
 120 }
 121 #ifdef CONFIG_MTD_PARTITIONS
 122 const char *part_probes[] = { "cmdlinepart", NULL };
 123 #endif
 124
 125 /*
 126  * Main initialization routine
 127  */
 128 static int __init ep7312_init (void)
 129 {
 130         struct nand_chip *this;
 131         const char *part_type = 0;
 132         int mtd_parts_nb = 0;
 133         struct mtd_partition *mtd_parts = 0;
 134         int ep7312_fio_base;
 135
 136         /* Allocate memory for MTD device structure and private data */
 137         ep7312_mtd = kmalloc(sizeof(struct mtd_info) +
 138                              sizeof(struct nand_chip),
 139                              GFP_KERNEL);
 140         if (!ep7312_mtd) {
 141                 printk("Unable to allocate EDB7312 NAND MTD device structure.\n");
 142                 return -ENOMEM;
 143         }
 144
 145         /* map physical adress */
 146         ep7312_fio_base = (unsigned long)ioremap(ep7312_fio_pbase, SZ_1K);
 147         if(!ep7312_fio_base) {
 148                 printk("ioremap EDB7312 NAND flash failed\n");
 149                 kfree(ep7312_mtd);
 150                 return -EIO;
 151         }
 152
 153         /* Get pointer to private data */
 154         this = (struct nand_chip *) (&ep7312_mtd[1]);
 155
 156         /* Initialize structures */
 157         memset((char *) ep7312_mtd, 0, sizeof(struct mtd_info));
 158         memset((char *) this, 0, sizeof(struct nand_chip));
 159
 160         /* Link the private data with the MTD structure */
 161         ep7312_mtd->priv = this;
 162
 163         /*
 164          * Set GPIO Port B control register so that the pins are configured
 165          * to be outputs for controlling the NAND flash.
 166          */
 167         clps_writeb(0xf0, ep7312_pxddr);
 168
 169         /* insert callbacks */
 170         this->IO_ADDR_R = ep7312_fio_base;
 171         this->IO_ADDR_W = ep7312_fio_base;
 172         this->hwcontrol = ep7312_hwcontrol;
 173         this->dev_ready = ep7312_device_ready;
 174         /* 15 us command delay time */
 175         this->chip_delay = 15;
 176
 177         /* Scan to find existence of the device */
 178         if (nand_scan (ep7312_mtd, 1)) {
 179                 iounmap((void *)ep7312_fio_base);
 180                 kfree (ep7312_mtd);
 181                 return -ENXIO;
 182         }
 183
 184         /* Allocate memory for internal data buffer */
 185         this->data_buf = kmalloc (sizeof(u_char) * (ep7312_mtd->oobblock + ep7312_mtd->oobsize), GFP_KERNEL);
 186         if (!this->data_buf) {
 187                 printk("Unable to allocate NAND data buffer for EDB7312.\n");
 188                 iounmap((void *)ep7312_fio_base);
 189                 kfree (ep7312_mtd);
 190                 return -ENOMEM;
 191         }
 192
 193 #ifdef CONFIG_PARTITIONS
 194         ep7312_mtd->name = "edb7312-nand";
 195         mtd_parts_nb = parse_mtd_partitions(ep7312_mtd, part_probes,
 196                                             &mtd_parts, 0);
 197         if (mtd_parts_nb > 0)
 198                 part_type = "command line";
 199         else
 200                 mtd_parts_nb = 0;
 201 #endif
 202         if (mtd_parts_nb == 0) {
 203                 mtd_parts = partition_info;
 204                 mtd_parts_nb = NUM_PARTITIONS;
 205                 part_type = "static";
 206         }
 207
 208         /* Register the partitions */
 209         printk(KERN_NOTICE "Using %s partition definition\n", part_type);
 210         add_mtd_partitions(ep7312_mtd, mtd_parts, mtd_parts_nb);
 211
 212         /* Return happy */
 213         return 0;
 214 }
 215 module_init(ep7312_init);
 216
 217 /*
 218  * Clean up routine
 219  */
 220 static void __exit ep7312_cleanup (void)
 221 {
 222         struct nand_chip *this = (struct nand_chip *) &ep7312_mtd[1];
 223
 224         /* Unregister the device */
 225         del_mtd_device (ep7312_mtd);
 226
 227         /* Free internal data buffer */
 228         kfree (this->data_buf);
 229
 230         /* Free the MTD device structure */
 231         kfree (ep7312_mtd);
 232 }
 233 module_exit(ep7312_cleanup);
 234
 235 MODULE_LICENSE("GPL");
 236 MODULE_AUTHOR("Marius Groeger <mag@sysgo.de>");
 237 MODULE_DESCRIPTION("MTD map driver for Cogent EDB7312 board");