linux-old/drivers/mtd/maps/sbc_gxx.c
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   1/* sbc_gxx.c -- MTD map driver for Arcom Control Systems SBC-MediaGX,
   2                SBC-GXm and SBC-GX1 series boards.
   3 
   4   Copyright (C) 2001 Arcom Control System Ltd
   5 
   6   This program is free software; you can redistribute it and/or modify
   7   it under the terms of the GNU General Public License as published by
   8   the Free Software Foundation; either version 2 of the License, or
   9   (at your option) any later version.
  10 
  11   This program is distributed in the hope that it will be useful,
  12   but WITHOUT ANY WARRANTY; without even the implied warranty of
  13   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14   GNU General Public License for more details.
  15 
  16   You should have received a copy of the GNU General Public License
  17   along with this program; if not, write to the Free Software
  18   Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
  19
  20   $Id: sbc_gxx.c,v 1.21 2003/01/24 13:40:14 dwmw2 Exp $
  21
  22The SBC-MediaGX / SBC-GXx has up to 16 MiB of 
  23Intel StrataFlash (28F320/28F640) in x8 mode.  
  24
  25This driver uses the CFI probe and Intel Extended Command Set drivers.
  26
  27The flash is accessed as follows:
  28
  29   16 KiB memory window at 0xdc000-0xdffff
  30   
  31   Two IO address locations for paging
  32   
  33   0x258
  34       bit 0-7: address bit 14-21
  35   0x259
  36       bit 0-1: address bit 22-23
  37       bit 7:   0 - reset/powered down
  38                1 - device enabled
  39
  40The single flash device is divided into 3 partition which appear as 
  41separate MTD devices.
  42
  4325/04/2001 AJL (Arcom)  Modified signon strings and partition sizes
  44                        (to support bzImages up to 638KiB-ish)
  45*/
  46
  47// Includes
  48
  49#include <linux/module.h>
  50#include <linux/slab.h>
  51#include <linux/ioport.h>
  52#include <linux/init.h>
  53#include <asm/io.h>
  54
  55#include <linux/mtd/mtd.h>
  56#include <linux/mtd/map.h>
  57#include <linux/mtd/partitions.h>
  58
  59// Defines
  60
  61// - Hardware specific
  62
  63#define WINDOW_START 0xdc000
  64
  65/* Number of bits in offset. */
  66#define WINDOW_SHIFT 14
  67#define WINDOW_LENGTH (1 << WINDOW_SHIFT)
  68
  69/* The bits for the offset into the window. */
  70#define WINDOW_MASK (WINDOW_LENGTH-1)
  71#define PAGE_IO 0x258
  72#define PAGE_IO_SIZE 2
  73
  74/* bit 7 of 0x259 must be 1 to enable device. */
  75#define DEVICE_ENABLE 0x8000
  76
  77// - Flash / Partition sizing
  78
  79#define MAX_SIZE_KiB             16384
  80#define BOOT_PARTITION_SIZE_KiB  768
  81#define DATA_PARTITION_SIZE_KiB  1280
  82#define APP_PARTITION_SIZE_KiB   6144
  83
  84// Globals
  85
  86static volatile int page_in_window = -1; // Current page in window.
  87static unsigned long iomapadr;
  88static spinlock_t sbc_gxx_spin = SPIN_LOCK_UNLOCKED;
  89
  90/* partition_info gives details on the logical partitions that the split the 
  91 * single flash device into. If the size if zero we use up to the end of the
  92 * device. */
  93static struct mtd_partition partition_info[]={
  94    { name: "SBC-GXx flash boot partition", 
  95      offset: 0, 
  96      size:   BOOT_PARTITION_SIZE_KiB*1024 },
  97    { name: "SBC-GXx flash data partition", 
  98      offset: BOOT_PARTITION_SIZE_KiB*1024, 
  99      size: (DATA_PARTITION_SIZE_KiB)*1024 },
 100    { name: "SBC-GXx flash application partition", 
 101      offset: (BOOT_PARTITION_SIZE_KiB+DATA_PARTITION_SIZE_KiB)*1024 }
 102};
 103
 104#define NUM_PARTITIONS 3
 105
 106static inline void sbc_gxx_page(struct map_info *map, unsigned long ofs)
 107{
 108        unsigned long page = ofs >> WINDOW_SHIFT;
 109
 110        if( page!=page_in_window ) {
 111                outw( page | DEVICE_ENABLE, PAGE_IO );
 112                page_in_window = page;
 113        }
 114}
 115
 116
 117static __u8 sbc_gxx_read8(struct map_info *map, unsigned long ofs)
 118{
 119        __u8 ret;
 120        spin_lock(&sbc_gxx_spin);
 121        sbc_gxx_page(map, ofs);
 122        ret = readb(iomapadr + (ofs & WINDOW_MASK));
 123        spin_unlock(&sbc_gxx_spin);
 124        return ret;
 125}
 126
 127static __u16 sbc_gxx_read16(struct map_info *map, unsigned long ofs)
 128{
 129        __u16 ret;
 130        spin_lock(&sbc_gxx_spin);
 131        sbc_gxx_page(map, ofs);
 132        ret = readw(iomapadr + (ofs & WINDOW_MASK));
 133        spin_unlock(&sbc_gxx_spin);
 134        return ret;
 135}
 136
 137static __u32 sbc_gxx_read32(struct map_info *map, unsigned long ofs)
 138{
 139        __u32 ret;
 140        spin_lock(&sbc_gxx_spin);
 141        sbc_gxx_page(map, ofs);
 142        ret = readl(iomapadr + (ofs & WINDOW_MASK));
 143        spin_unlock(&sbc_gxx_spin);
 144        return ret;
 145}
 146
 147static void sbc_gxx_copy_from(struct map_info *map, void *to, unsigned long from, ssize_t len)
 148{
 149        while(len) {
 150                unsigned long thislen = len;
 151                if (len > (WINDOW_LENGTH - (from & WINDOW_MASK)))
 152                        thislen = WINDOW_LENGTH-(from & WINDOW_MASK);
 153                
 154                spin_lock(&sbc_gxx_spin);
 155                sbc_gxx_page(map, from);
 156                memcpy_fromio(to, iomapadr + (from & WINDOW_MASK), thislen);
 157                spin_unlock(&sbc_gxx_spin);
 158                to += thislen;
 159                from += thislen;
 160                len -= thislen;
 161        }
 162}
 163
 164static void sbc_gxx_write8(struct map_info *map, __u8 d, unsigned long adr)
 165{
 166        spin_lock(&sbc_gxx_spin);
 167        sbc_gxx_page(map, adr);
 168        writeb(d, iomapadr + (adr & WINDOW_MASK));
 169        spin_unlock(&sbc_gxx_spin);
 170}
 171
 172static void sbc_gxx_write16(struct map_info *map, __u16 d, unsigned long adr)
 173{
 174        spin_lock(&sbc_gxx_spin);
 175        sbc_gxx_page(map, adr);
 176        writew(d, iomapadr + (adr & WINDOW_MASK));
 177        spin_unlock(&sbc_gxx_spin);
 178}
 179
 180static void sbc_gxx_write32(struct map_info *map, __u32 d, unsigned long adr)
 181{
 182        spin_lock(&sbc_gxx_spin);
 183        sbc_gxx_page(map, adr);
 184        writel(d, iomapadr + (adr & WINDOW_MASK));
 185        spin_unlock(&sbc_gxx_spin);
 186}
 187
 188static void sbc_gxx_copy_to(struct map_info *map, unsigned long to, const void *from, ssize_t len)
 189{       
 190        while(len) {
 191                unsigned long thislen = len;
 192                if (len > (WINDOW_LENGTH - (to & WINDOW_MASK)))
 193                        thislen = WINDOW_LENGTH-(to & WINDOW_MASK);
 194                
 195                spin_lock(&sbc_gxx_spin);
 196                sbc_gxx_page(map, to);
 197                memcpy_toio(iomapadr + (to & WINDOW_MASK), from, thislen);
 198                spin_unlock(&sbc_gxx_spin);
 199                to += thislen;
 200                from += thislen;
 201                len -= thislen;
 202        }
 203}
 204
 205static struct map_info sbc_gxx_map = {
 206        name: "SBC-GXx flash",
 207        size: MAX_SIZE_KiB*1024, /* this must be set to a maximum possible amount
 208                         of flash so the cfi probe routines find all
 209                         the chips */
 210        buswidth: 1,
 211        read8: sbc_gxx_read8,
 212        read16: sbc_gxx_read16,
 213        read32: sbc_gxx_read32,
 214        copy_from: sbc_gxx_copy_from,
 215        write8: sbc_gxx_write8,
 216        write16: sbc_gxx_write16,
 217        write32: sbc_gxx_write32,
 218        copy_to: sbc_gxx_copy_to
 219};
 220
 221/* MTD device for all of the flash. */
 222static struct mtd_info *all_mtd;
 223
 224static void cleanup_sbc_gxx(void)
 225{
 226        if( all_mtd ) {
 227                del_mtd_partitions( all_mtd );
 228                map_destroy( all_mtd );
 229        }
 230
 231        iounmap((void *)iomapadr);
 232        release_region(PAGE_IO,PAGE_IO_SIZE);
 233}
 234
 235int __init init_sbc_gxx(void)
 236{
 237        if (check_region(PAGE_IO,PAGE_IO_SIZE) != 0) {
 238                printk( KERN_ERR"%s: IO ports 0x%x-0x%x in use\n",
 239                        sbc_gxx_map.name,
 240                        PAGE_IO, PAGE_IO+PAGE_IO_SIZE-1 );
 241                return -EAGAIN;
 242        }
 243        iomapadr = (unsigned long)ioremap(WINDOW_START, WINDOW_LENGTH);
 244        if (!iomapadr) {
 245                printk( KERN_ERR"%s: failed to ioremap memory region\n",
 246                        sbc_gxx_map.name );
 247                return -EIO;
 248        }
 249        
 250        request_region( PAGE_IO, PAGE_IO_SIZE, "SBC-GXx flash" );
 251        
 252        printk( KERN_INFO"%s: IO:0x%x-0x%x MEM:0x%x-0x%x\n",
 253                sbc_gxx_map.name,
 254                PAGE_IO, PAGE_IO+PAGE_IO_SIZE-1,
 255                WINDOW_START, WINDOW_START+WINDOW_LENGTH-1 );
 256
 257        /* Probe for chip. */
 258        all_mtd = do_map_probe( "cfi_probe", &sbc_gxx_map );
 259        if( !all_mtd ) {
 260                cleanup_sbc_gxx();
 261                return -ENXIO;
 262        }
 263        
 264        all_mtd->module=THIS_MODULE;
 265
 266        /* Create MTD devices for each partition. */
 267        add_mtd_partitions(all_mtd, partition_info, NUM_PARTITIONS );
 268
 269        return 0;
 270}
 271
 272module_init(init_sbc_gxx);
 273module_exit(cleanup_sbc_gxx);
 274
 275MODULE_LICENSE("GPL");
 276MODULE_AUTHOR("Arcom Control Systems Ltd.");
 277MODULE_DESCRIPTION("MTD map driver for SBC-GXm and SBC-GX1 series boards");
 278