target/linux/amazon/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 = 0x1000000,
  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 {
 112         unsigned long magic;
 113         unsigned long temp;
 114         amazon_copy_from(&amazon_map, &magic, start_offset, 4);
 115         if (!(ntohl(magic) == 0x27051956)) {
 116                 printk(KERN_INFO "amazon_mtd: invalid magic (0x%08X) of kernel at 0x%08lx \n", ntohl(magic), start_offset);
 117                 return 0;
 118         }
 119         amazon_copy_from(&amazon_map, &temp, start_offset + 12, 4);
 120         printk(KERN_INFO "amazon_mtd: kernel size is %ld \n", temp + 0x40);
 121         return temp + 0x40;
 122 }
 123
 124 int __init init_amazon_mtd(void)
 125 {
 126         int ret = 0;
 127         unsigned long uimage_size;
 128         struct mtd_info *mymtd = NULL;
 129         struct mtd_partition *parts = NULL;
 130
 131         *AMAZON_EBU_BUSCON0 = 0x1d7ff;
 132
 133         amazon_map.read = amazon_read16;
 134         amazon_map.write = amazon_write16;
 135         amazon_map.copy_from = amazon_copy_from;
 136         amazon_map.copy_to = amazon_copy_to;
 137
 138         amazon_map.phys = flash_start;
 139         amazon_map.virt = ioremap_nocache(flash_start, flash_size);
 140
 141         if (!amazon_map.virt) {
 142                 printk(KERN_WARNING "Failed to ioremap!\n");
 143                 return -EIO;
 144         }
 145
 146         mymtd = (struct mtd_info *) do_map_probe("cfi_probe", &amazon_map);
 147         if (!mymtd) {
 148                 iounmap(amazon_map.virt);
 149                 printk("probing failed\n");
 150                 return -ENXIO;
 151         }
 152
 153         mymtd->owner = THIS_MODULE;
 154         parts = &amazon_partitions[0];
 155
 156         /* Some Samsung devices are containing a 16 MB flash chip with a bigger U-Boot partition. */
 157         if(mymtd->size == 0x01000000 && mymtd->erasesize == 0x00020000) {
 158                 printk(KERN_INFO "amazon_mtd: Found big flash chip!\n");
 159                 amazon_partitions[0].size = 0x60000;
 160                 amazon_partitions[1].offset = 0x60000;
 161                 uimage_size = find_uImage_size(amazon_partitions[1].offset);
 162                 amazon_partitions[1].size = uimage_size;
 163                 amazon_partitions[2].offset = 0x60000 + uimage_size;
 164                 amazon_partitions[2].size = mymtd->size - amazon_partitions[2].offset - mymtd->erasesize;
 165         } else {
 166                 printk(KERN_INFO "amazon_mtd: Found small flash chip!\n");
 167                 uimage_size = find_uImage_size(amazon_partitions[1].offset);
 168                 amazon_partitions[1].size = uimage_size;
 169                 amazon_partitions[2].offset = UBOOT_SIZE + uimage_size;
 170                 amazon_partitions[2].size = mymtd->size - amazon_partitions[2].offset - (2 * mymtd->erasesize);
 171         }
 172
 173         add_mtd_partitions(mymtd, parts, 3);
 174
 175         printk(KERN_INFO "amazon_mtd: added %s flash with %dMB\n",
 176                 amazon_map.name, mymtd->size >> 20);
 177         return 0;
 178 }
 179
 180 static void __exit cleanup_amazon_mtd(void)
 181 {
 182         /* FIXME! */
 183 }
 184
 185 module_init(init_amazon_mtd);
 186 module_exit(cleanup_amazon_mtd);
 187
 188 MODULE_LICENSE("GPL");
 189 MODULE_AUTHOR("john crispin blogic@openwrt.org");
 190 MODULE_DESCRIPTION("MTD map driver for AMAZON boards");