target/linux/lantiq/patches-3.10/0100-mtd-split.patch

   1 --- a/arch/mips/lantiq/xway/Makefile
   2 +++ b/arch/mips/lantiq/xway/Makefile
   3 @@ -1,6 +1,6 @@
   4  obj-y := prom.o sysctrl.o clk.o reset.o dma.o gptu.o dcdc.o
   5
   6 -obj-y += vmmc.o
   7 +obj-y += vmmc.o mtd_split.o
   8
   9  obj-$(CONFIG_PCI) += ath_eep.o rt_eep.o pci-ath-fixup.o
  10
  11 --- /dev/null
  12 +++ b/arch/mips/lantiq/xway/mtd_split.c
  13 @@ -0,0 +1,129 @@
  14 +#include <linux/magic.h>
  15 +#include <linux/root_dev.h>
  16 +#include <linux/mtd/mtd.h>
  17 +#include <linux/mtd/partitions.h>
  18 +
  19 +#define ROOTFS_SPLIT_NAME "rootfs_data"
  20 +
  21 +struct squashfs_super_block {
  22 +       __le32 s_magic;
  23 +       __le32 pad0[9];
  24 +       __le64 bytes_used;
  25 +};
  26 +
  27 +static void split_brnimage_kernel(struct mtd_info *master, const char *name,
  28 +                                       int offset, int size)
  29 +{
  30 +       unsigned long buf[4];
  31 +       // Assume at most 2MB of kernel image
  32 +       unsigned long end = offset + (2 << 20);
  33 +       unsigned long part_size = offset + 0x400 - 12;
  34 +       size_t len;
  35 +       int ret;
  36 +
  37 +       if (strcmp(name, "rootfs") != 0)
  38 +               return;
  39 +       while (part_size < end) {
  40 +               long size_min = part_size - 0x400 - 12 - offset;
  41 +               long size_max = part_size + 12 - offset;
  42 +               ret = mtd_read(master, part_size, 16, &len, (void *)buf);
  43 +               if (ret || len != 16)
  44 +                       return;
  45 +
  46 +               if (le32_to_cpu(buf[0]) < size_min ||
  47 +                               le32_to_cpu(buf[0]) > size_max) {
  48 +                       part_size += 0x400;
  49 +                       continue;
  50 +               }
  51 +
  52 +               if (le32_to_cpu(buf[3]) == SQUASHFS_MAGIC) {
  53 +                       part_size += 12 - offset;
  54 +                       __mtd_add_partition(master, "rootfs", offset + part_size,
  55 +                                                   size - part_size, false);
  56 +                       return;
  57 +               }
  58 +               part_size += 0x400;
  59 +       }
  60 +}
  61 +
  62 +static void split_eva_kernel(struct mtd_info *master, const char *name,
  63 +                               int offset, int size)
  64 +{
  65 +#define EVA_MAGIC   0xfeed1281
  66 +       unsigned long magic = 0;
  67 +       unsigned long part_size = 0, p;
  68 +       size_t len;
  69 +       int ret;
  70 +
  71 +       if (strcmp(name, CONFIG_MTD_SPLIT_FIRMWARE_NAME) != 0)
  72 +               return;
  73 +
  74 +       ret = mtd_read(master, offset, 4, &len, (void *)&magic);
  75 +       if (ret || len != sizeof(magic))
  76 +               return;
  77 +
  78 +       if (le32_to_cpu(magic) != EVA_MAGIC)
  79 +               return;
  80 +
  81 +       ret = mtd_read(master, offset + 4, 4, &len, (void *)&part_size);
  82 +       if (ret || len != sizeof(part_size))
  83 +               return;
  84 +
  85 +       p = part_size = le32_to_cpu(part_size) + 0x18;
  86 +       p &= ~0xffff;
  87 +       p += 0x10000;
  88 +
  89 +       ret = mtd_read(master, offset + p, 4, &len, (void *)&magic);
  90 +       if (ret || len != sizeof(magic))
  91 +               return;
  92 +
  93 +       if (magic == SQUASHFS_MAGIC)
  94 +               part_size = p + 0x100;
  95 +       else
  96 +               part_size = mtd_pad_erasesize(master, offset, len);
  97 +
  98 +       if (part_size + master->erasesize > size)
  99 +               return;
 100 +
 101 +       __mtd_add_partition(master, "rootfs", offset + part_size,
 102 +                           size - part_size, false);
 103 +}
 104 +
 105 +static void split_tplink_kernel(struct mtd_info *master, const char *name,
 106 +                               int offset, int size)
 107 +{
 108 +#define TPLINK_MAGIC   0x00000002
 109 +       unsigned long magic = 0;
 110 +       unsigned long part_size = 0;
 111 +       size_t len;
 112 +       int ret;
 113 +
 114 +       if (strcmp(name, CONFIG_MTD_SPLIT_FIRMWARE_NAME) != 0)
 115 +               return;
 116 +
 117 +       ret = mtd_read(master, offset, 4, &len, (void *)&magic);
 118 +       if (ret || len != sizeof(magic))
 119 +               return;
 120 +
 121 +       if (le32_to_cpu(magic) != TPLINK_MAGIC)
 122 +               return;
 123 +
 124 +       ret = mtd_read(master, offset + 0x78, 4, &len, (void *)&part_size);
 125 +       if (ret || len != sizeof(part_size))
 126 +               return;
 127 +
 128 +       part_size = be32_to_cpu(part_size) + 0x200;
 129 +       if (part_size + master->erasesize > size)
 130 +               return;
 131 +
 132 +       __mtd_add_partition(master, "rootfs", offset + part_size,
 133 +                           size - part_size, false);
 134 +}
 135 +
 136 +void arch_split_mtd_part(struct mtd_info *master, const char *name,
 137 +                               int offset, int size)
 138 +{
 139 +       split_tplink_kernel(master, name, offset, size);
 140 +       split_eva_kernel(master, name, offset, size);
 141 +       split_brnimage_kernel(master, name, offset, size);
 142 +}
 143 --- a/include/linux/mtd/partitions.h
 144 +++ b/include/linux/mtd/partitions.h
 145 @@ -89,12 +89,17 @@ extern int deregister_mtd_parser(struct
 146  int mtd_is_partition(const struct mtd_info *mtd);
 147  int mtd_add_partition(struct mtd_info *master, char *name,
 148                       long long offset, long long length);
 149 +int __mtd_add_partition(struct mtd_info *master, char *name,
 150 +                   long long offset, long long length, bool dup_check);
 151 +
 152  int mtd_del_partition(struct mtd_info *master, int partno);
 153  struct mtd_info *mtdpart_get_master(const struct mtd_info *mtd);
 154  uint64_t mtdpart_get_offset(const struct mtd_info *mtd);
 155  uint64_t mtd_get_device_size(const struct mtd_info *mtd);
 156 -extern void __weak arch_split_mtd_part(struct mtd_info *master,
 157 -                                      const char *name, int offset, int size);
 158 +void __weak arch_split_mtd_part(struct mtd_info *master,
 159 +                                      const char *name, int offset, int size);
 160 +unsigned long
 161 +mtd_pad_erasesize(struct mtd_info *mtd, int offset, int len);
 162
 163  int parse_mtd_partitions_by_type(struct mtd_info *master,
 164                                  enum mtd_parser_type type,
 165 --- a/drivers/mtd/mtdpart.c
 166 +++ b/drivers/mtd/mtdpart.c
 167 @@ -616,7 +616,7 @@ out_register:
 168  }
 169
 170
 171 -static int
 172 +int
 173  __mtd_add_partition(struct mtd_info *master, char *name,
 174                     long long offset, long long length, bool dup_check)
 175  {
 176 @@ -737,7 +737,7 @@ run_parsers_by_type(struct mtd_part *sla
 177         return nr_parts;
 178  }
 179
 180 -static inline unsigned long
 181 +unsigned long
 182  mtd_pad_erasesize(struct mtd_info *mtd, int offset, int len)
 183  {
 184         unsigned long mask = mtd->erasesize - 1;
 185 @@ -806,7 +806,6 @@ static void split_uimage(struct mtd_info
 186                 return;
 187
 188         len = be32_to_cpu(hdr.size) + 0x40;
 189 -       len = mtd_pad_erasesize(master, part->offset, len);
 190         if (len + master->erasesize > part->mtd.size)
 191                 return;
 192