From: Sekhar Nori nsekhar@ti.com
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 --- arch/arm/include/asm/arch-am33xx/omap.h | 2 ++ board/ti/am43xx/board.c | 46 +++++++++++++++++++++++++++++++ board/ti/am43xx/board.h | 32 +++++++++++++++++++++ include/configs/am43xx_evm.h | 7 +++++ 4 files changed, 87 insertions(+)
diff --git a/arch/arm/include/asm/arch-am33xx/omap.h b/arch/arm/include/asm/arch-am33xx/omap.h index 2250721..10f05c9 100644 --- a/arch/arm/include/asm/arch-am33xx/omap.h +++ b/arch/arm/include/asm/arch-am33xx/omap.h @@ -27,5 +27,7 @@ #define NON_SECURE_SRAM_START 0x402F0400 #define NON_SECURE_SRAM_END 0x40340000 #define SRAM_SCRATCH_SPACE_ADDR 0x4033C000 +#define AM4372_BOARD_NAME_START SRAM_SCRATCH_SPACE_ADDR +#define AM4372_BOARD_NAME_END SRAM_SCRATCH_SPACE_ADDR + 0xC #endif #endif diff --git a/board/ti/am43xx/board.c b/board/ti/am43xx/board.c index dcd8cbb..4fc1a40 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 8ca098b..9268895 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 diff --git a/include/configs/am43xx_evm.h b/include/configs/am43xx_evm.h index 6693321..7810c59 100644 --- a/include/configs/am43xx_evm.h +++ b/include/configs/am43xx_evm.h @@ -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 (0x4030C000 - CONFIG_SPL_TEXT_BASE)