ar71xx: add some RouterBOOT specific helper functions

Signed-off-by: Gabor Juhos <juhosg@openwrt.org>

SVN-Revision: 39091
This commit is contained in:
Gabor Juhos 2013-12-16 10:11:01 +00:00
parent 0601b5f404
commit 16565ec94b
2 changed files with 153 additions and 0 deletions

View file

@ -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;
}

View file

@ -11,11 +11,35 @@
#ifndef _ATH79_ROUTERBOOT_H_
#define _ATH79_ROUTERBOOT_H_
struct rb_info {
unsigned int hard_cfg_offs;
unsigned int hard_cfg_size;
void *hard_cfg_data;
unsigned int soft_cfg_offs;
const char *board_name;
u32 hw_options;
};
#ifdef CONFIG_ATH79_ROUTERBOOT
const struct rb_info *rb_init_info(void *data, unsigned int size);
void *rb_get_wlan_data(void);
int routerboot_find_tag(u8 *buf, unsigned int buflen, u16 tag_id,
u8 **tag_data, u16 *tag_len);
int routerboot_find_magic(u8 *buf, unsigned int buflen, u32 *offset, bool hard);
#else
static inline const struct rb_info *
rb_init_info(void *data, unsigned int size)
{
return NULL;
}
static inline void *rb_get_wlan_data(void)
{
return NULL;
}
static inline int
routerboot_find_tag(u8 *buf, unsigned int buflen, u16 tag_id,
u8 **tag_data, u16 *tag_len)