drivers/mtd/maps/pb1xxx-flash.c

   1 /*
   2  * Flash memory access on Alchemy Pb1xxx boards
   3  *
   4  * (C) 2001 Pete Popov <ppopov@mvista.com>
   5  *
   6  * $Id: pb1xxx-flash.c,v 1.4 2002/09/13 13:51:54 dwmw2 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 #ifdef CONFIG_MIPS_PB1000
  28 #define WINDOW_ADDR 0x1F800000
  29 #define WINDOW_SIZE 0x800000
  30 #endif
  31
  32 __u8 physmap_read8(struct map_info *map, unsigned long ofs)
  33 {
  34         __u8 ret;
  35         ret = __raw_readb(map->map_priv_1 + ofs);
  36         DBG("read8 from %x, %x\n", (unsigned)(map->map_priv_1 + ofs), ret);
  37         return ret;
  38 }
  39
  40 __u16 physmap_read16(struct map_info *map, unsigned long ofs)
  41 {
  42         __u16 ret;
  43         ret = __raw_readw(map->map_priv_1 + ofs);
  44         DBG("read16 from %x, %x\n", (unsigned)(map->map_priv_1 + ofs), ret);
  45         return ret;
  46 }
  47
  48 __u32 physmap_read32(struct map_info *map, unsigned long ofs)
  49 {
  50         __u32 ret;
  51         ret = __raw_readl(map->map_priv_1 + ofs);
  52         DBG("read32 from %x, %x\n", (unsigned)(map->map_priv_1 + ofs), ret);
  53         return ret;
  54 }
  55
  56 void physmap_copy_from(struct map_info *map, void *to, unsigned long from, ssize_t len)
  57 {
  58         DBG("physmap_copy from %x to %x\n", (unsigned)from, (unsigned)to);
  59         memcpy_fromio(to, map->map_priv_1 + from, len);
  60 }
  61
  62 void physmap_write8(struct map_info *map, __u8 d, unsigned long adr)
  63 {
  64         DBG("write8 at %x, %x\n", (unsigned)(map->map_priv_1 + adr), d);
  65         __raw_writeb(d, map->map_priv_1 + adr);
  66         mb();
  67 }
  68
  69 void physmap_write16(struct map_info *map, __u16 d, unsigned long adr)
  70 {
  71         DBG("write16 at %x, %x\n", (unsigned)(map->map_priv_1 + adr), d);
  72         __raw_writew(d, map->map_priv_1 + adr);
  73         mb();
  74 }
  75
  76 void physmap_write32(struct map_info *map, __u32 d, unsigned long adr)
  77 {
  78         DBG("write32 at %x, %x\n", (unsigned)(map->map_priv_1 + adr), d);
  79         __raw_writel(d, map->map_priv_1 + adr);
  80         mb();
  81 }
  82
  83 void physmap_copy_to(struct map_info *map, unsigned long to, const void *from, ssize_t len)
  84 {
  85         DBG("physmap_copy_to %x from %x\n", (unsigned)to, (unsigned)from);
  86         memcpy_toio(map->map_priv_1 + to, from, len);
  87 }
  88
  89
  90
  91 static struct map_info pb1xxx_map = {
  92         name:           "Pb1xxx flash",
  93         read8: physmap_read8,
  94         read16: physmap_read16,
  95         read32: physmap_read32,
  96         copy_from: physmap_copy_from,
  97         write8: physmap_write8,
  98         write16: physmap_write16,
  99         write32: physmap_write32,
 100         copy_to: physmap_copy_to,
 101 };
 102
 103
 104 #ifdef CONFIG_MIPS_PB1000
 105
 106 static unsigned long flash_size = 0x00800000;
 107 static unsigned char flash_buswidth = 4;
 108 static struct mtd_partition pb1xxx_partitions[] = {
 109         {
 110                 name: "yamon env",
 111                 size: 0x00020000,
 112                 offset: 0,
 113                 mask_flags: MTD_WRITEABLE
 114         },{
 115                 name: "User FS",
 116                 size: 0x003e0000,
 117                 offset: 0x20000,
 118         },{
 119                 name: "boot code",
 120                 size: 0x100000,
 121                 offset: 0x400000,
 122                 mask_flags: MTD_WRITEABLE
 123         },{
 124                 name: "raw/kernel",
 125                 size: 0x300000,
 126                 offset: 0x500000
 127         }
 128 };
 129
 130 #elif defined(CONFIG_MIPS_PB1500) || defined(CONFIG_MIPS_PB1100)
 131
 132 static unsigned char flash_buswidth = 4;
 133 #if defined(CONFIG_MTD_PB1500_BOOT) && defined(CONFIG_MTD_PB1500_USER)
 134 /* both 32MiB banks will be used. Combine the first 32MiB bank and the
 135  * first 28MiB of the second bank together into a single jffs/jffs2
 136  * partition.
 137  */
 138 static unsigned long flash_size = 0x04000000;
 139 #define WINDOW_ADDR 0x1C000000
 140 #define WINDOW_SIZE 0x4000000
 141 static struct mtd_partition pb1xxx_partitions[] = {
 142         {
 143                 name: "User FS",
 144                 size:   0x3c00000,
 145                 offset: 0x0000000
 146         },{
 147                 name: "yamon",
 148                 size: 0x0100000,
 149                 offset: 0x3c00000,
 150                 mask_flags: MTD_WRITEABLE
 151         },{
 152                 name: "raw kernel",
 153                 size: 0x02c0000,
 154                 offset: 0x3d00000
 155         }
 156 };
 157 #elif defined(CONFIG_MTD_PB1500_BOOT) && !defined(CONFIG_MTD_PB1500_USER)
 158 static unsigned long flash_size = 0x02000000;
 159 #define WINDOW_ADDR 0x1E000000
 160 #define WINDOW_SIZE 0x2000000
 161 static struct mtd_partition pb1xxx_partitions[] = {
 162         {
 163                 name: "User FS",
 164                 size:   0x1c00000,
 165                 offset: 0x0000000
 166         },{
 167                 name: "yamon",
 168                 size: 0x0100000,
 169                 offset: 0x1c00000,
 170                 mask_flags: MTD_WRITEABLE
 171         },{
 172                 name: "raw kernel",
 173                 size: 0x02c0000,
 174                 offset: 0x1d00000
 175         }
 176 };
 177 #elif !defined(CONFIG_MTD_PB1500_BOOT) && defined(CONFIG_MTD_PB1500_USER)
 178 static unsigned long flash_size = 0x02000000;
 179 #define WINDOW_ADDR 0x1C000000
 180 #define WINDOW_SIZE 0x2000000
 181 static struct mtd_partition pb1xxx_partitions[] = {
 182         {
 183                 name: "User FS",
 184                 size:   0x1e00000,
 185                 offset: 0x0000000
 186         },{
 187                 name: "raw kernel",
 188                 size: 0x0200000,
 189                 offset: 0x1e00000,
 190         }
 191 };
 192 #else
 193 #error MTD_PB1500 define combo error /* should never happen */
 194 #endif
 195 #else
 196 #error Unsupported board
 197 #endif
 198
 199
 200 #define NB_OF(x)  (sizeof(x)/sizeof(x[0]))
 201
 202 static struct mtd_partition *parsed_parts;
 203 static struct mtd_info *mymtd;
 204
 205 int __init pb1xxx_mtd_init(void)
 206 {
 207         struct mtd_partition *parts;
 208         int nb_parts = 0;
 209         char *part_type;
 210
 211         /* Default flash buswidth */
 212         pb1xxx_map.buswidth = flash_buswidth;
 213
 214         /*
 215          * Static partition definition selection
 216          */
 217         part_type = "static";
 218         parts = pb1xxx_partitions;
 219         nb_parts = NB_OF(pb1xxx_partitions);
 220         pb1xxx_map.size = flash_size;
 221
 222         /*
 223          * Now let's probe for the actual flash.  Do it here since
 224          * specific machine settings might have been set above.
 225          */
 226         printk(KERN_NOTICE "Pb1xxx flash: probing %d-bit flash bus\n",
 227                         pb1xxx_map.buswidth*8);
 228         pb1xxx_map.map_priv_1 =
 229                 (unsigned long)ioremap(WINDOW_ADDR, WINDOW_SIZE);
 230         mymtd = do_map_probe("cfi_probe", &pb1xxx_map);
 231         if (!mymtd) return -ENXIO;
 232         mymtd->module = THIS_MODULE;
 233
 234         add_mtd_partitions(mymtd, parts, nb_parts);
 235         return 0;
 236 }
 237
 238 static void __exit pb1xxx_mtd_cleanup(void)
 239 {
 240         if (mymtd) {
 241                 del_mtd_partitions(mymtd);
 242                 map_destroy(mymtd);
 243                 if (parsed_parts)
 244                         kfree(parsed_parts);
 245         }
 246 }
 247
 248 module_init(pb1xxx_mtd_init);
 249 module_exit(pb1xxx_mtd_cleanup);
 250
 251 MODULE_AUTHOR("Pete Popov");
 252 MODULE_DESCRIPTION("Pb1xxx CFI map driver");
 253 MODULE_LICENSE("GPL");