drivers/mtd/maps/sbc_gxx.c

   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 1.33 2004/11/28 09:40:40 dwmw2 Exp $
  21
  22 The SBC-MediaGX / SBC-GXx has up to 16 MiB of
  23 Intel StrataFlash (28F320/28F640) in x8 mode.
  24
  25 This driver uses the CFI probe and Intel Extended Command Set drivers.
  26
  27 The 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
  40 The single flash device is divided into 3 partition which appear as
  41 separate MTD devices.
  42
  43 25/04/2001 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
  86 static volatile int page_in_window = -1; // Current page in window.
  87 static void __iomem *iomapadr;
  88 static DEFINE_SPINLOCK(sbc_gxx_spin);
  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. */
  93 static 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
 106 static 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
 117 static map_word sbc_gxx_read8(struct map_info *map, unsigned long ofs)
 118 {
 119         map_word ret;
 120         spin_lock(&sbc_gxx_spin);
 121         sbc_gxx_page(map, ofs);
 122         ret.x[0] = readb(iomapadr + (ofs & WINDOW_MASK));
 123         spin_unlock(&sbc_gxx_spin);
 124         return ret;
 125 }
 126
 127 static void sbc_gxx_copy_from(struct map_info *map, void *to, unsigned long from, ssize_t len)
 128 {
 129         while(len) {
 130                 unsigned long thislen = len;
 131                 if (len > (WINDOW_LENGTH - (from & WINDOW_MASK)))
 132                         thislen = WINDOW_LENGTH-(from & WINDOW_MASK);
 133
 134                 spin_lock(&sbc_gxx_spin);
 135                 sbc_gxx_page(map, from);
 136                 memcpy_fromio(to, iomapadr + (from & WINDOW_MASK), thislen);
 137                 spin_unlock(&sbc_gxx_spin);
 138                 to += thislen;
 139                 from += thislen;
 140                 len -= thislen;
 141         }
 142 }
 143
 144 static void sbc_gxx_write8(struct map_info *map, map_word d, unsigned long adr)
 145 {
 146         spin_lock(&sbc_gxx_spin);
 147         sbc_gxx_page(map, adr);
 148         writeb(d.x[0], iomapadr + (adr & WINDOW_MASK));
 149         spin_unlock(&sbc_gxx_spin);
 150 }
 151
 152 static void sbc_gxx_copy_to(struct map_info *map, unsigned long to, const void *from, ssize_t len)
 153 {
 154         while(len) {
 155                 unsigned long thislen = len;
 156                 if (len > (WINDOW_LENGTH - (to & WINDOW_MASK)))
 157                         thislen = WINDOW_LENGTH-(to & WINDOW_MASK);
 158
 159                 spin_lock(&sbc_gxx_spin);
 160                 sbc_gxx_page(map, to);
 161                 memcpy_toio(iomapadr + (to & WINDOW_MASK), from, thislen);
 162                 spin_unlock(&sbc_gxx_spin);
 163                 to += thislen;
 164                 from += thislen;
 165                 len -= thislen;
 166         }
 167 }
 168
 169 static struct map_info sbc_gxx_map = {
 170         .name = "SBC-GXx flash",
 171         .phys = NO_XIP,
 172         .size = MAX_SIZE_KiB*1024, /* this must be set to a maximum possible amount
 173                          of flash so the cfi probe routines find all
 174                          the chips */
 175         .bankwidth = 1,
 176         .read = sbc_gxx_read8,
 177         .copy_from = sbc_gxx_copy_from,
 178         .write = sbc_gxx_write8,
 179         .copy_to = sbc_gxx_copy_to
 180 };
 181
 182 /* MTD device for all of the flash. */
 183 static struct mtd_info *all_mtd;
 184
 185 static void cleanup_sbc_gxx(void)
 186 {
 187         if( all_mtd ) {
 188                 del_mtd_partitions( all_mtd );
 189                 map_destroy( all_mtd );
 190         }
 191
 192         iounmap(iomapadr);
 193         release_region(PAGE_IO,PAGE_IO_SIZE);
 194 }
 195
 196 static int __init init_sbc_gxx(void)
 197 {
 198         iomapadr = ioremap(WINDOW_START, WINDOW_LENGTH);
 199         if (!iomapadr) {
 200                 printk( KERN_ERR"%s: failed to ioremap memory region\n",
 201                         sbc_gxx_map.name );
 202                 return -EIO;
 203         }
 204
 205         if (!request_region( PAGE_IO, PAGE_IO_SIZE, "SBC-GXx flash")) {
 206                 printk( KERN_ERR"%s: IO ports 0x%x-0x%x in use\n",
 207                         sbc_gxx_map.name,
 208                         PAGE_IO, PAGE_IO+PAGE_IO_SIZE-1 );
 209                 iounmap(iomapadr);
 210                 return -EAGAIN;
 211         }
 212
 213
 214         printk( KERN_INFO"%s: IO:0x%x-0x%x MEM:0x%x-0x%x\n",
 215                 sbc_gxx_map.name,
 216                 PAGE_IO, PAGE_IO+PAGE_IO_SIZE-1,
 217                 WINDOW_START, WINDOW_START+WINDOW_LENGTH-1 );
 218
 219         /* Probe for chip. */
 220         all_mtd = do_map_probe( "cfi_probe", &sbc_gxx_map );
 221         if( !all_mtd ) {
 222                 cleanup_sbc_gxx();
 223                 return -ENXIO;
 224         }
 225
 226         all_mtd->owner = THIS_MODULE;
 227
 228         /* Create MTD devices for each partition. */
 229         add_mtd_partitions(all_mtd, partition_info, NUM_PARTITIONS );
 230
 231         return 0;
 232 }
 233
 234 module_init(init_sbc_gxx);
 235 module_exit(cleanup_sbc_gxx);
 236
 237 MODULE_LICENSE("GPL");
 238 MODULE_AUTHOR("Arcom Control Systems Ltd.");
 239 MODULE_DESCRIPTION("MTD map driver for SBC-GXm and SBC-GX1 series boards");