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ARM: AM43XX: board: add support for reading onboard EEPROM

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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>
This commit is contained in:
Sekhar Nori 2013-12-10 15:02:15 +05:30 committed by Tom Rini
parent 1564dba7d9
commit 9f1a8cd33f
4 changed files with 87 additions and 0 deletions
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2
arch/arm/include/asm/arch-am33xx/omap.h
View file

@ -27,5 +27,7 @@
#define NON_SECURE_SRAM_START 0x402F0400
#define NON_SECURE_SRAM_END 0x40340000
#define SRAM_SCRATCH_SPACE_ADDR 0x40337C00
#define AM4372_BOARD_NAME_START SRAM_SCRATCH_SPACE_ADDR
#define AM4372_BOARD_NAME_END SRAM_SCRATCH_SPACE_ADDR + 0xC
#endif
#endif

46
board/ti/am43xx/board.c
View file

@ -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 = {

32
board/ti/am43xx/board.h
View file

@ -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

7
include/configs/am43xx_evm.h
View file

@ -25,6 +25,13 @@
#define CONFIG_SYS_NS16550_REG_SIZE (-4)
#define CONFIG_SYS_NS16550_CLK 48000000
/* I2C Configuration */
#define CONFIG_CMD_EEPROM
#define CONFIG_ENV_EEPROM_IS_ON_I2C
#define CONFIG_SYS_I2C_EEPROM_ADDR 0x50 /* Main EEPROM */
#define CONFIG_SYS_I2C_EEPROM_ADDR_LEN 2
#define CONFIG_SYS_I2C_MULTI_EEPROMS
/* SPL defines. */
#define CONFIG_SPL_TEXT_BASE 0x40300350
#define CONFIG_SPL_MAX_SIZE (0x40337C00 - CONFIG_SPL_TEXT_BASE)