ar71xx: add some RouterBOOT specific helper functions

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

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@39091 3c298f89-4303-0410-b956-a3cf2f4a3e73

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;
+}

target/linux/ar71xx/files/arch/mips/ath79/routerboot.h

@@ -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)