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authorSekhar Nori <nsekhar@ti.com>2013-12-10 15:02:15 +0530
committerTom Rini <trini@ti.com>2013-12-18 21:14:00 -0500
commit9f1a8cd33fec83c5e04c8d1103fb3ee2857ff2f0 (patch)
treeb3f7cdaf89467a5aa08fadad5a81189b2287346a /board
parent1564dba7d919e27d9e9c43b3277dfc3da14701d3 (diff)
ARM: AM43XX: board: add support for reading onboard EEPROM
Add support for reading onboard EEPROM to enable board detection. Signed-off-by: Sekhar Nori <nsekhar@ti.com> Signed-off-by: Lokesh Vutla <lokeshvutla@ti.com>
Diffstat (limited to 'board')
-rw-r--r--board/ti/am43xx/board.c46
-rw-r--r--board/ti/am43xx/board.h32
2 files changed, 78 insertions, 0 deletions
diff --git a/board/ti/am43xx/board.c b/board/ti/am43xx/board.c
index dcd8cbbe2b..4fc1a40c04 100644
--- a/board/ti/am43xx/board.c
+++ b/board/ti/am43xx/board.c
@@ -9,6 +9,8 @@
*/
#include <common.h>
+#include <i2c.h>
+#include <asm/errno.h>
#include <spl.h>
#include <asm/arch/clock.h>
#include <asm/arch/sys_proto.h>
@@ -17,6 +19,50 @@
DECLARE_GLOBAL_DATA_PTR;
+/*
+ * Read header information from EEPROM into global structure.
+ */
+static int read_eeprom(struct am43xx_board_id *header)
+{
+ /* Check if baseboard eeprom is available */
+ if (i2c_probe(CONFIG_SYS_I2C_EEPROM_ADDR)) {
+ printf("Could not probe the EEPROM at 0x%x\n",
+ CONFIG_SYS_I2C_EEPROM_ADDR);
+ return -ENODEV;
+ }
+
+ /* read the eeprom using i2c */
+ if (i2c_read(CONFIG_SYS_I2C_EEPROM_ADDR, 0, 2, (uchar *)header,
+ sizeof(struct am43xx_board_id))) {
+ printf("Could not read the EEPROM\n");
+ return -EIO;
+ }
+
+ if (header->magic != 0xEE3355AA) {
+ /*
+ * read the eeprom using i2c again,
+ * but use only a 1 byte address
+ */
+ if (i2c_read(CONFIG_SYS_I2C_EEPROM_ADDR, 0, 1, (uchar *)header,
+ sizeof(struct am43xx_board_id))) {
+ printf("Could not read the EEPROM at 0x%x\n",
+ CONFIG_SYS_I2C_EEPROM_ADDR);
+ return -EIO;
+ }
+
+ if (header->magic != 0xEE3355AA) {
+ printf("Incorrect magic number (0x%x) in EEPROM\n",
+ header->magic);
+ return -EINVAL;
+ }
+ }
+
+ strncpy(am43xx_board_name, (char *)header->name, sizeof(header->name));
+ am43xx_board_name[sizeof(header->name)] = 0;
+
+ return 0;
+}
+
#ifdef CONFIG_SPL_BUILD
const struct dpll_params dpll_ddr = {
diff --git a/board/ti/am43xx/board.h b/board/ti/am43xx/board.h
index 8ca098b82a..9268895659 100644
--- a/board/ti/am43xx/board.h
+++ b/board/ti/am43xx/board.h
@@ -12,6 +12,38 @@
#ifndef _BOARD_H_
#define _BOARD_H_
+#include <asm/arch/omap.h>
+
+static char *const am43xx_board_name = (char *)AM4372_BOARD_NAME_START;
+
+/*
+ * TI AM437x EVMs define a system EEPROM that defines certain sub-fields.
+ * We use these fields to in turn see what board we are on, and what
+ * that might require us to set or not set.
+ */
+#define HDR_NO_OF_MAC_ADDR 3
+#define HDR_ETH_ALEN 6
+#define HDR_NAME_LEN 8
+
+struct am43xx_board_id {
+ unsigned int magic;
+ char name[HDR_NAME_LEN];
+ char version[4];
+ char serial[12];
+ char config[32];
+ char mac_addr[HDR_NO_OF_MAC_ADDR][HDR_ETH_ALEN];
+};
+
+static inline int board_is_eposevm(void)
+{
+ return !strncmp(am43xx_board_name, "AM43EPOS", HDR_NAME_LEN);
+}
+
+static inline int board_is_gpevm(void)
+{
+ return !strncmp(am43xx_board_name, "AM43__GP", HDR_NAME_LEN);
+}
+
void enable_uart0_pin_mux(void);
void enable_board_pin_mux(void);
#endif