linux-old/drivers/mtd/maps/autcpu12-nvram.c
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   1/*
   2 * NV-RAM memory access on autcpu12 
   3 * (C) 2002 Thomas Gleixner (gleixner@autronix.de)
   4 *
   5 * $Id: autcpu12-nvram.c,v 1.1 2002/02/22 09:30:24 gleixner Exp $ 
   6 *
   7 * This program is free software; you can redistribute it and/or modify
   8 * it under the terms of the GNU General Public License as published by
   9 * the Free Software Foundation; either version 2 of the License, or
  10 * (at your option) any later version.
  11 *
  12 * This program is distributed in the hope that it will be useful,
  13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15 * GNU General Public License for more details.
  16 *
  17 * You should have received a copy of the GNU General Public License
  18 * along with this program; if not, write to the Free Software
  19 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  20 *
  21 */
  22
  23#include <linux/module.h>
  24#include <linux/types.h>
  25#include <linux/kernel.h>
  26#include <linux/ioport.h>
  27#include <asm/io.h>
  28#include <asm/sizes.h>
  29#include <asm/hardware.h>
  30#include <asm/arch/autcpu12.h>
  31#include <linux/mtd/mtd.h>
  32#include <linux/mtd/map.h>
  33#include <linux/mtd/partitions.h>
  34
  35__u8 autcpu12_read8(struct map_info *map, unsigned long ofs)
  36{
  37        return __raw_readb(map->map_priv_1 + ofs);
  38}
  39
  40__u16 autcpu12_read16(struct map_info *map, unsigned long ofs)
  41{
  42        return __raw_readw(map->map_priv_1 + ofs);
  43}
  44
  45__u32 autcpu12_read32(struct map_info *map, unsigned long ofs)
  46{
  47        return __raw_readl(map->map_priv_1 + ofs);
  48}
  49
  50void autcpu12_write8(struct map_info *map, __u8 d, unsigned long adr)
  51{
  52        __raw_writeb(d, map->map_priv_1 + adr);
  53        mb();
  54}
  55
  56void autcpu12_write16(struct map_info *map, __u16 d, unsigned long adr)
  57{
  58        __raw_writew(d, map->map_priv_1 + adr);
  59        mb();
  60}
  61
  62void autcpu12_write32(struct map_info *map, __u32 d, unsigned long adr)
  63{
  64        __raw_writel(d, map->map_priv_1 + adr);
  65        mb();
  66}
  67
  68void autcpu12_copy_from(struct map_info *map, void *to, unsigned long from, ssize_t len)
  69{
  70        memcpy_fromio(to, map->map_priv_1 + from, len);
  71}
  72
  73void autcpu12_copy_to(struct map_info *map, unsigned long to, const void *from, ssize_t len)
  74{
  75        while(len) {
  76                __raw_writeb(*(unsigned char *) from, map->map_priv_1 + to);
  77                from++;
  78                to++;
  79                len--;
  80        }
  81}
  82
  83static struct mtd_info *sram_mtd;
  84
  85struct map_info autcpu12_sram_map = {
  86        name: "SRAM",
  87        size: 32768,
  88        buswidth: 8,
  89        read8: autcpu12_read8,
  90        read16: autcpu12_read16,
  91        read32: autcpu12_read32,
  92        copy_from: autcpu12_copy_from,
  93        write8: autcpu12_write8,
  94        write16: autcpu12_write16,
  95        write32: autcpu12_write32,
  96        copy_to: autcpu12_copy_to
  97};
  98
  99static int __init init_autcpu12_sram (void)
 100{
 101        int err, save0, save1;
 102
 103        autcpu12_sram_map.map_priv_1 = (unsigned long)ioremap(0x12000000, SZ_128K);
 104        if (!autcpu12_sram_map.map_priv_1) {
 105                printk("Failed to ioremap autcpu12 NV-RAM space\n");
 106                err = -EIO;
 107                goto out;
 108        }
 109        
 110        /* 
 111         * Check for 32K/128K 
 112         * read ofs 0 
 113         * read ofs 0x10000 
 114         * Write complement to ofs 0x100000
 115         * Read and check result on ofs 0x0
 116         * Restore contents
 117         */
 118        save0 = autcpu12_read32(&autcpu12_sram_map,0);
 119        save1 = autcpu12_read32(&autcpu12_sram_map,0x10000);
 120        autcpu12_write32(&autcpu12_sram_map,~save0,0x10000);
 121        /* if we find this pattern on 0x0, we have 32K size 
 122         * restore contents and exit
 123         */
 124        if ( autcpu12_read32(&autcpu12_sram_map,0) != save0) {
 125                autcpu12_write32(&autcpu12_sram_map,save0,0x0);
 126                goto map;
 127        }
 128        /* We have a 128K found, restore 0x10000 and set size
 129         * to 128K
 130         */
 131        autcpu12_write32(&autcpu12_sram_map,save1,0x10000);
 132        autcpu12_sram_map.size = SZ_128K;
 133
 134map:
 135        sram_mtd = do_map_probe("map_ram", &autcpu12_sram_map);
 136        if (!sram_mtd) {
 137                printk("NV-RAM probe failed\n");
 138                err = -ENXIO;
 139                goto out_ioremap;
 140        }
 141
 142        sram_mtd->module = THIS_MODULE;
 143        sram_mtd->erasesize = 16;
 144        
 145        if (add_mtd_device(sram_mtd)) {
 146                printk("NV-RAM device addition failed\n");
 147                err = -ENOMEM;
 148                goto out_probe;
 149        }
 150
 151        printk("NV-RAM device size %ldK registered on AUTCPU12\n",autcpu12_sram_map.size/SZ_1K);
 152                
 153        return 0;
 154
 155out_probe:
 156        map_destroy(sram_mtd);
 157        sram_mtd = 0;
 158
 159out_ioremap:
 160        iounmap((void *)autcpu12_sram_map.map_priv_1);
 161out:
 162        return err;
 163}
 164
 165static void __exit cleanup_autcpu12_maps(void)
 166{
 167        if (sram_mtd) {
 168                del_mtd_device(sram_mtd);
 169                map_destroy(sram_mtd);
 170                iounmap((void *)autcpu12_sram_map.map_priv_1);
 171        }
 172}
 173
 174module_init(init_autcpu12_sram);
 175module_exit(cleanup_autcpu12_maps);
 176
 177MODULE_AUTHOR("Thomas Gleixner");
 178MODULE_DESCRIPTION("autcpu12 NV-RAM map driver");
 179MODULE_LICENSE("GPL");
 180