drivers/mtd/maps/usi-flash.c

   1 /*
   2  * Flash memory access on IDT 79S334 boards
   3  *
   4  * (C) 2001 Pete Popov <ppopov@mvista.com>
   5  *
   6  * $Id: usi-flash.c,v 1.1.1.1 2005/04/11 02:50:26 jack Exp $
   7  */
   8
   9 #include <linux/config.h>
  10 #include <linux/module.h>
  11 #include <linux/types.h>
  12 #include <linux/kernel.h>
  13
  14 #include <linux/mtd/mtd.h>
  15 #include <linux/mtd/map.h>
  16 #include <linux/mtd/partitions.h>
  17
  18 #include <asm/io.h>
  19 //#include <asm/au1000.h>
  20
  21 #ifdef  DEBUG_RW
  22 #define DBG(x...)       printk(x)
  23 #else
  24 #define DBG(x...)
  25 #endif
  26
  27 //jackl
  28 //#define WINDOW_ADDR 0xFF800000
  29 //#define WINDOW_SIZE 0x800000
  30 #define WINDOW_ADDR 0xFFC00000
  31 #define WINDOW_SIZE 0x400000
  32
  33 __u8 physmap_read8(struct map_info *map, unsigned long ofs)
  34 {
  35         __u8 ret;
  36         ret = readb(map->map_priv_1 + ofs);
  37         DBG("read8 from %x, %x\n", (unsigned)(map->map_priv_1 + ofs), ret);
  38         return ret;
  39 }
  40
  41 __u16 physmap_read16(struct map_info *map, unsigned long ofs)
  42 {
  43         __u16 ret;
  44         ret = readw(map->map_priv_1 + ofs);
  45         DBG("read16 from %x, %x\n", (unsigned)(map->map_priv_1 + ofs), ret);
  46         return ret;
  47 }
  48
  49 __u32 physmap_read32(struct map_info *map, unsigned long ofs)
  50 {
  51         __u32 ret;
  52         ret = readl(map->map_priv_1 + ofs);
  53         DBG("read32 from %x, %x\n", (unsigned)(map->map_priv_1 + ofs), ret);
  54         return ret;
  55 }
  56
  57 void physmap_copy_from(struct map_info *map, void *to, unsigned long from, ssize_t len)
  58 {
  59         DBG("physmap_copy from %x to %x\n", (unsigned)from, (unsigned)to);
  60         memcpy_fromio(to, map->map_priv_1 + from, len);
  61 }
  62
  63 void physmap_write8(struct map_info *map, __u8 d, unsigned long adr)
  64 {
  65         DBG("write8 at %x, %x\n", (unsigned)(map->map_priv_1 + adr), d);
  66         writeb(d, map->map_priv_1 + adr);
  67         mb();
  68 }
  69
  70 void physmap_write16(struct map_info *map, __u16 d, unsigned long adr)
  71 {
  72         DBG("write16 at %x, %x\n", (unsigned)(map->map_priv_1 + adr), d);
  73         writew(d, map->map_priv_1 + adr);
  74         mb();
  75 }
  76
  77 void physmap_write32(struct map_info *map, __u32 d, unsigned long adr)
  78 {
  79         DBG("write32 at %x, %x\n", (unsigned)(map->map_priv_1 + adr), d);
  80         writel(d, map->map_priv_1 + adr);
  81         mb();
  82 }
  83
  84 void physmap_copy_to(struct map_info *map, unsigned long to, const void *from, ssize_t len)
  85 {
  86         DBG("physmap_copy_to %x from %x\n", (unsigned)to, (unsigned)from);
  87         memcpy_toio(map->map_priv_1 + to, from, len);
  88 }
  89
  90
  91
  92 static struct map_info usi_map = {
  93         name:           "USI Intel flash",
  94         read8:          physmap_read8,
  95         read16:         physmap_read16,
  96         read32:         physmap_read32,
  97         copy_from:      physmap_copy_from,
  98         write8:         physmap_write8,
  99         write16:        physmap_write16,
 100         write32:        physmap_write32,
 101         copy_to:        physmap_copy_to,
 102
 103         //map_priv_1:     WINDOW_ADDR,
 104 };
 105
 106 //jackl
 107 //static unsigned long flash_size = 0x00800000;
 108 static unsigned long flash_size = 0x00400000;
 109
 110 static unsigned char flash_buswidth = 1;
 111 //static struct mtd_partition usi_partitions[] = {
 112 //        {
 113 //                name: "Linux Kernel",
 114 //                size: 0x00100000,
 115 //                offset: 0,
 116 //        },{
 117 //                name: "Linux Ramdisk",
 118 //                size: 0x00600000,
 119 //                offset: 0x00100000,
 120 //        },{
 121 //              name: "U-BOOT BOOT LOADER",
 122 //                size: 0x00040000,
 123 //                offset: 0x00700000,
 124 //        },{
 125 //              name: "ETC",
 126 //                size: 0x000C0000,
 127 //                offset: 0x00740000,
 128 //       }
 129 //};
 130
 131 static struct mtd_partition usi_partitions[] = {
 132         {
 133                 name: "Linux mtd1",
 134                 size: 0x00010000,
 135                 offset: 0,
 136         },{
 137                 name: "Linux mtd2",
 138                 size: 0x00010000,
 139                 offset: 0x00010000,
 140         },{
 141                         name: "Linux Ramdisk",
 142                 size: 0x002e0000,
 143                 offset: 0x00020000,
 144         },{
 145                 name: "U-BOOT BOOT LOADER",
 146                 size: 0x00010000,
 147                 offset: 0x00300000,
 148         },{
 149                 name: "Linux Kernel",
 150                 size: 0x000f0000,
 151                 offset: 0x00310000,
 152        }
 153 };
 154
 155 #define NB_OF(x)  (sizeof(x)/sizeof(x[0]))
 156
 157 static struct mtd_partition *parsed_parts;
 158 static struct mtd_info *mymtd;
 159
 160 int __init usi_mtd_init(void)
 161 {
 162         struct mtd_partition *parts;
 163         int nb_parts = 0;
 164         char *part_type;
 165
 166         /* Default flash buswidth */
 167         usi_map.buswidth = flash_buswidth;
 168
 169         /*
 170          * Static partition definition selection
 171          */
 172         part_type = "static";
 173         parts = usi_partitions;
 174         nb_parts = NB_OF(usi_partitions);
 175         usi_map.size = flash_size;
 176
 177         /*
 178          * Now let's probe for the actual flash.  Do it here since
 179          * specific machine settings might have been set above.
 180          */
 181         printk(KERN_NOTICE "USI AMD/FUJITSU flash: probing %d-bit flash bus\n",
 182                         usi_map.buswidth*8);
 183         usi_map.map_priv_1 =
 184                 (unsigned long)ioremap(WINDOW_ADDR, WINDOW_SIZE);
 185         mymtd = do_map_probe("cfi_probe", &usi_map);
 186         if (!mymtd) return -ENXIO;
 187         mymtd->module = THIS_MODULE;
 188
 189         add_mtd_partitions(mymtd, parts, nb_parts);
 190         return 0;
 191 }
 192
 193 static void __exit usi_mtd_cleanup(void)
 194 {
 195         if (mymtd) {
 196                 del_mtd_partitions(mymtd);
 197                 map_destroy(mymtd);
 198                 if (parsed_parts)
 199                         kfree(parsed_parts);
 200         }
 201 }
 202
 203 module_init(usi_mtd_init);
 204 module_exit(usi_mtd_cleanup);
 205
 206 MODULE_AUTHOR("Pete Popov");
 207 MODULE_DESCRIPTION("USI Intel CFI map driver");
 208 MODULE_LICENSE("GPL");