target/linux/amazon-2.6/files/drivers/mtd/maps/amazon.c

   1 /*
   2  * Handle mapping of the flash memory access routines
   3  * on Amazon  based devices.
   4  *
   5  * Copyright(C) 2004 peng.liu@infineon.com
   6  *
   7  * This code is GPLed
   8  *
   9  */
  10 // 000005:fchang 2005/6/2 Modified by Bingtao to double check if the EBU is enabled/disabled
  11 // 506231:tc.chen 2005/06/23 increase firmware partition size form 192KB to 256KB
  12 // 050701:linmars 2005/07/01 fix flash size wrong alignment after increase firmware partition
  13 // 165001:henryhsu 2005/8/18 Remove the support for Intel flash because of 2.1 not enough rootfs partition size
  14 // 165001:henryhsu 2005/9/7 Rolback to support INtel flash
  15 // 509071:tc.chen 2005/09/07 Reduced flash writing time
  16 // 511046:linmars 2005/11/04 change bootloader size from 128 into 64
  17 // 511241:linmars 2005/11/24 merge TaiChen's IRM patch
  18
  19 // copyright 2005 infineon
  20
  21 // copyright 2007 john crispin <blogic@openwrt.org>
  22 // copyright 2007 felix fietkau <nbd@openwrt.org>
  23
  24 #include <linux/module.h>
  25 #include <linux/types.h>
  26 #include <linux/kernel.h>
  27 #include <asm/io.h>
  28
  29 #include <linux/init.h>
  30 #include <linux/mtd/mtd.h>
  31 #include <linux/mtd/map.h>
  32 #include <linux/mtd/partitions.h>
  33 #include <linux/mtd/cfi.h>
  34 #include <linux/mutex.h>
  35 #include <asm/amazon/amazon.h>
  36
  37 #define AMAZON_PCI_ARB_CTL_ALT 0xb100205c
  38 #define AMAZON_MTD_REG32( addr )          (*(volatile u32 *)(addr))
  39
  40
  41 static struct map_info amazon_map = {
  42         .name = "AMAZON_FLASH",
  43         .bankwidth = 2,
  44         .size = 0x400000,
  45 };
  46
  47 static map_word amazon_read16(struct map_info * map, unsigned long ofs)
  48 {
  49         map_word temp;
  50         ofs ^= 2;
  51         temp.x[0] = *((__u16 *) (map->virt + ofs));
  52         return temp;
  53 }
  54
  55 static void amazon_write16(struct map_info *map, map_word d, unsigned long adr)
  56 {
  57         adr ^= 2;
  58         *((__u16 *) (map->virt + adr)) = d.x[0];
  59 }
  60
  61 void amazon_copy_from(struct map_info *map, void *to, unsigned long from, ssize_t len)
  62 {
  63         u8 *p;
  64         u8 *to_8;
  65         ssize_t l = len;
  66         from = (unsigned long) (from + map->virt);
  67         p = (u8 *) from;
  68         to_8 = (u8 *) to;
  69         while(len--){
  70                 *to_8++ = *p++;
  71         }
  72 }
  73
  74 void amazon_copy_to(struct map_info *map, unsigned long to, const void *from, ssize_t len)
  75 {
  76         u8 *p =  (u8*) from;
  77         u8 *to_8;
  78         to += (unsigned long) map->virt;
  79         to_8 = (u8*)to;
  80         while(len--){
  81                 *p++ = *to_8++;
  82         }
  83 }
  84
  85 #define UBOOT_SIZE              0x40000
  86
  87 static struct mtd_partition     amazon_partitions[3] = {
  88          {
  89                   name:"U-Boot",                /* U-Boot firmware */
  90                   offset:0x00000000,
  91                   size:UBOOT_SIZE ,             /* 128k */
  92           },
  93          {
  94                   name:"kernel",                /* firmware */
  95                   offset:UBOOT_SIZE,
  96                   size:0x00100000,              /* 192K */
  97           },
  98          {
  99                   name:"rootfs",                /* default partition */
 100                   offset:0x00200000,
 101                   size:0x00200000,
 102           },
 103 };
 104
 105
 106 unsigned long flash_start = 0x13000000;
 107 unsigned long flash_size = 0x800000;
 108 unsigned long uImage_size = 0x10000d;
 109
 110 int find_uImage_size(unsigned long start_offset){
 111         unsigned long temp;
 112
 113         printk("trying to find uImage and its size\n");
 114         amazon_copy_from(&amazon_map, &temp, start_offset + 12, 4);
 115         printk("kernel size is %d \n", temp + 0x40);
 116         return temp + 0x40;
 117 }
 118
 119 int __init init_amazon_mtd(void)
 120 {
 121         int ret = 0;
 122         struct mtd_info *mymtd = NULL;
 123         struct mtd_partition *parts = NULL;
 124
 125         *AMAZON_EBU_BUSCON0 = 0x1d7ff;
 126
 127         amazon_map.read = amazon_read16;
 128         amazon_map.write = amazon_write16;
 129         amazon_map.copy_from = amazon_copy_from;
 130         amazon_map.copy_to = amazon_copy_to;
 131
 132         amazon_map.phys = flash_start;
 133         amazon_map.virt = ioremap_nocache(flash_start, flash_size);
 134
 135         if (!amazon_map.virt) {
 136                 printk(KERN_WARNING "Failed to ioremap!\n");
 137                 return -EIO;
 138         }
 139
 140         mymtd = (struct mtd_info *) do_map_probe("cfi_probe", &amazon_map);
 141         if (!mymtd) {
 142                 iounmap(amazon_map.virt);
 143                 printk("probing failed\n");
 144                 return -ENXIO;
 145         }
 146
 147         mymtd->owner = THIS_MODULE;
 148         parts = &amazon_partitions[0];
 149         amazon_partitions[2].offset = UBOOT_SIZE + find_uImage_size(amazon_partitions[1].offset);
 150         amazon_partitions[1].size = mymtd->size - amazon_partitions[1].offset - (2 * mymtd->erasesize);
 151         amazon_partitions[2].size = mymtd->size - amazon_partitions[2].offset - (2 * mymtd->erasesize);
 152         add_mtd_partitions(mymtd, parts, 3);
 153         return 0;
 154 }
 155
 156 static void __exit cleanup_amazon_mtd(void)
 157 {
 158         /* FIXME! */
 159 }
 160
 161 module_init(init_amazon_mtd);
 162 module_exit(cleanup_amazon_mtd);
 163
 164 MODULE_LICENSE("GPL");
 165 MODULE_AUTHOR("john crispin blogic@openwrt.org");
 166 MODULE_DESCRIPTION("MTD map driver for AMAZON boards");