ar71xx: add some RouterBOOT specific helper functions

[openwrt/openwrt.git] / target / linux / ar71xx / files / arch / mips / ath79 / routerboot.c

diff --git a/target/linux/ar71xx/files/arch/mips/ath79/routerboot.c b/target/linux/ar71xx/files/arch/mips/ath79/routerboot.c
index 1cb1f9d4ebdf3702897c7ee09e2f2e7d83afa876..dbdec02056a0e869fa8403589edd92db09ae3b01 100644 (file)
--- a/target/linux/ar71xx/files/arch/mips/ath79/routerboot.c
+++ b/target/linux/ar71xx/files/arch/mips/ath79/routerboot.c
@@ -8,12 +8,21 @@
  *  by the Free Software Foundation.
  */
 
+#define pr_fmt(fmt) "rb: " fmt
+
 #include <linux/kernel.h>
+#include <linux/slab.h>
 #include <linux/errno.h>
 #include <linux/routerboot.h>
+#include <linux/rle.h>
 
 #include "routerboot.h"
 
+#define RB_BLOCK_SIZE          0x1000
+#define RB_ART_SIZE            0x10000
+
+static struct rb_info rb_info;
+
 static u32 get_u32(void *buf)
 {
        u8 *p = buf;
@@ -118,3 +127,123 @@ routerboot_find_tag(u8 *buf, unsigned int buflen, u16 tag_id,
 
        return ret;
 }
+
+static inline int
+rb_find_hard_cfg_tag(u16 tag_id, u8 **tag_data, u16 *tag_len)
+{
+       if (!rb_info.hard_cfg_data ||
+           !rb_info.hard_cfg_size)
+               return -ENOENT;
+
+       return routerboot_find_tag(rb_info.hard_cfg_data,
+                                  rb_info.hard_cfg_size,
+                                  tag_id, tag_data, tag_len);
+}
+
+__init const char *
+rb_get_board_name(void)
+{
+       u16 tag_len;
+       u8 *tag;
+       int err;
+
+       err = rb_find_hard_cfg_tag(RB_ID_BOARD_NAME, &tag, &tag_len);
+       if (err)
+               return NULL;
+
+       return tag;
+}
+
+__init u32
+rb_get_hw_options(void)
+{
+       u16 tag_len;
+       u8 *tag;
+       int err;
+
+       err = rb_find_hard_cfg_tag(RB_ID_HW_OPTIONS, &tag, &tag_len);
+       if (err)
+               return 0;
+
+       return get_u32(tag);
+}
+
+__init void *
+rb_get_wlan_data(void)
+{
+       u16 tag_len;
+       u8 *tag;
+       void *buf;
+       int err;
+
+       err = rb_find_hard_cfg_tag(RB_ID_WLAN_DATA, &tag, &tag_len);
+       if (err) {
+               pr_err("no calibration data found\n");
+               goto err;
+       }
+
+       buf = kmalloc(RB_ART_SIZE, GFP_KERNEL);
+       if (buf == NULL) {
+               pr_err("no memory for calibration data\n");
+               goto err;
+       }
+
+       err = rle_decode((char *) tag, tag_len, buf, RB_ART_SIZE,
+                        NULL, NULL);
+       if (err) {
+               pr_err("unable to decode calibration data\n");
+               goto err_free;
+       }
+
+       return buf;
+
+err_free:
+       kfree(buf);
+err:
+       return NULL;
+}
+
+__init const struct rb_info *
+rb_init_info(void *data, unsigned int size)
+{
+       unsigned int offset;
+
+       if (size == 0 || (size % RB_BLOCK_SIZE) != 0)
+               return NULL;
+
+       for (offset = 0; offset < size; offset += RB_BLOCK_SIZE) {
+               u32 magic;
+
+               magic = get_u32(data + offset);
+               switch (magic) {
+               case RB_MAGIC_HARD:
+                       rb_info.hard_cfg_offs = offset;
+                       break;
+
+               case RB_MAGIC_SOFT:
+                       rb_info.soft_cfg_offs = offset;
+                       break;
+               }
+       }
+
+       if (!rb_info.hard_cfg_offs) {
+               pr_err("could not find a valid RouterBOOT hard config\n");
+               return NULL;
+       }
+
+       if (!rb_info.soft_cfg_offs) {
+               pr_err("could not find a valid RouterBOOT soft config\n");
+               return NULL;
+       }
+
+       rb_info.hard_cfg_size = RB_BLOCK_SIZE;
+       rb_info.hard_cfg_data = kmemdup(data + rb_info.hard_cfg_offs,
+                                       RB_BLOCK_SIZE, GFP_KERNEL);
+       if (!rb_info.hard_cfg_data)
+               return NULL;
+
+       rb_info.board_name = rb_get_board_name();
+       rb_info.hw_options = rb_get_hw_options();
+
+       return &rb_info;
+}