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 1.8 2003/05/21 12:45:19 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 #include <linux/init.h>
  14
  15 #include <linux/mtd/mtd.h>
  16 #include <linux/mtd/map.h>
  17 #include <linux/mtd/partitions.h>
  18
  19 #include <asm/io.h>
  20 #include <asm/au1000.h>
  21
  22 #ifdef  DEBUG_RW
  23 #define DBG(x...)       printk(x)
  24 #else
  25 #define DBG(x...)
  26 #endif
  27
  28 #ifdef CONFIG_MIPS_PB1000
  29 #define WINDOW_ADDR 0x1F800000
  30 #define WINDOW_SIZE 0x800000
  31 #endif
  32
  33
  34 static struct map_info pb1xxx_map = {
  35         .name = "Pb1xxx flash",
  36 };
  37
  38
  39 #ifdef CONFIG_MIPS_PB1000
  40
  41 static unsigned long flash_size = 0x00800000;
  42 static unsigned char flash_buswidth = 4;
  43 static struct mtd_partition pb1xxx_partitions[] = {
  44         {
  45                 .name = "yamon env",
  46                 .size = 0x00020000,
  47                 .offset = 0,
  48                 .mask_flags = MTD_WRITEABLE
  49         },{
  50                 .name = "User FS",
  51                 .size = 0x003e0000,
  52                 .offset = 0x20000,
  53         },{
  54                 .name = "boot code",
  55                 .size = 0x100000,
  56                 .offset = 0x400000,
  57                 .mask_flags = MTD_WRITEABLE
  58         },{
  59                 .name = "raw/kernel",
  60                 .size = 0x300000,
  61                 .offset = 0x500000
  62         }
  63 };
  64
  65 #elif defined(CONFIG_MIPS_PB1500) || defined(CONFIG_MIPS_PB1100)
  66
  67 static unsigned char flash_buswidth = 4;
  68 #if defined(CONFIG_MTD_PB1500_BOOT) && defined(CONFIG_MTD_PB1500_USER)
  69 /* both 32MiB banks will be used. Combine the first 32MiB bank and the
  70  * first 28MiB of the second bank together into a single jffs/jffs2
  71  * partition.
  72  */
  73 static unsigned long flash_size = 0x04000000;
  74 #define WINDOW_ADDR 0x1C000000
  75 #define WINDOW_SIZE 0x4000000
  76 static struct mtd_partition pb1xxx_partitions[] = {
  77         {
  78                 .name = "User FS",
  79                 .size =   0x3c00000,
  80                 .offset = 0x0000000
  81         },{
  82                 .name = "yamon",
  83                 .size = 0x0100000,
  84                 .offset = 0x3c00000,
  85                 .mask_flags = MTD_WRITEABLE
  86         },{
  87                 .name = "raw kernel",
  88                 .size = 0x02c0000,
  89                 .offset = 0x3d00000
  90         }
  91 };
  92 #elif defined(CONFIG_MTD_PB1500_BOOT) && !defined(CONFIG_MTD_PB1500_USER)
  93 static unsigned long flash_size = 0x02000000;
  94 #define WINDOW_ADDR 0x1E000000
  95 #define WINDOW_SIZE 0x2000000
  96 static struct mtd_partition pb1xxx_partitions[] = {
  97         {
  98                 .name = "User FS",
  99                 .size =   0x1c00000,
 100                 .offset = 0x0000000
 101         },{
 102                 .name = "yamon",
 103                 .size = 0x0100000,
 104                 .offset = 0x1c00000,
 105                 .mask_flags = MTD_WRITEABLE
 106         },{
 107                 .name = "raw kernel",
 108                 .size = 0x02c0000,
 109                 .offset = 0x1d00000
 110         }
 111 };
 112 #elif !defined(CONFIG_MTD_PB1500_BOOT) && defined(CONFIG_MTD_PB1500_USER)
 113 static unsigned long flash_size = 0x02000000;
 114 #define WINDOW_ADDR 0x1C000000
 115 #define WINDOW_SIZE 0x2000000
 116 static struct mtd_partition pb1xxx_partitions[] = {
 117         {
 118                 .name = "User FS",
 119                 .size =   0x1e00000,
 120                 .offset = 0x0000000
 121         },{
 122                 .name = "raw kernel",
 123                 .size = 0x0200000,
 124                 .offset = 0x1e00000,
 125         }
 126 };
 127 #else
 128 #error MTD_PB1500 define combo error /* should never happen */
 129 #endif
 130 #else
 131 #error Unsupported board
 132 #endif
 133
 134
 135 #define NB_OF(x)  (sizeof(x)/sizeof(x[0]))
 136
 137 static struct mtd_partition *parsed_parts;
 138 static struct mtd_info *mymtd;
 139
 140 int __init pb1xxx_mtd_init(void)
 141 {
 142         struct mtd_partition *parts;
 143         int nb_parts = 0;
 144         char *part_type;
 145
 146         /* Default flash buswidth */
 147         pb1xxx_map.buswidth = flash_buswidth;
 148
 149         /*
 150          * Static partition definition selection
 151          */
 152         part_type = "static";
 153         parts = pb1xxx_partitions;
 154         nb_parts = NB_OF(pb1xxx_partitions);
 155         pb1xxx_map.size = flash_size;
 156
 157         /*
 158          * Now let's probe for the actual flash.  Do it here since
 159          * specific machine settings might have been set above.
 160          */
 161         printk(KERN_NOTICE "Pb1xxx flash: probing %d-bit flash bus\n",
 162                         pb1xxx_map.buswidth*8);
 163         pb1xxx_map.phys = WINDOW_ADDR;
 164         pb1xxx_map.virt = (unsigned long)ioremap(WINDOW_ADDR, WINDOW_SIZE);
 165
 166         simple_map_init(&pb1xxx_map);
 167
 168         mymtd = do_map_probe("cfi_probe", &pb1xxx_map);
 169         if (!mymtd) {
 170                 iounmap(pb1xxx_map.virt);
 171                 return -ENXIO;
 172         }
 173         mymtd->owner = THIS_MODULE;
 174
 175         add_mtd_partitions(mymtd, parts, nb_parts);
 176         return 0;
 177 }
 178
 179 static void __exit pb1xxx_mtd_cleanup(void)
 180 {
 181         if (mymtd) {
 182                 del_mtd_partitions(mymtd);
 183                 map_destroy(mymtd);
 184                 if (parsed_parts)
 185                         kfree(parsed_parts);
 186         }
 187         if (pb1xxx_map.virt)
 188                 iounmap(pb1xxx_map.virt);
 189 }
 190
 191 module_init(pb1xxx_mtd_init);
 192 module_exit(pb1xxx_mtd_cleanup);
 193
 194 MODULE_AUTHOR("Pete Popov");
 195 MODULE_DESCRIPTION("Pb1xxx CFI map driver");
 196 MODULE_LICENSE("GPL");