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board: ti: am64x: Add support for reading eeprom data

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I2C EEPROM data contains the board name and its revision.
Add support for:
- Reading EEPROM data and store a copy at end of SRAM
- Updating env variable with relevant board info
- Printing board info during boot.

Signed-off-by: Lokesh Vutla <lokeshvutla@ti.com>
This commit is contained in:
Lokesh Vutla 2021-05-06 16:44:49 +05:30
parent 776b79e9f1
commit 2ee76314a7
2 changed files with 95 additions and 0 deletions
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3
arch/arm/mach-k3/include/mach/am64_hardware.h
View File

@ -49,4 +49,7 @@
#define ROM_ENTENDED_BOOT_DATA_INFO 0x701beb00
/* Use Last 1K as Scratch pad */
#define TI_SRAM_SCRATCH_BOARD_EEPROM_START 0x701bfc00
#endif /* __ASM_ARCH_DRA8_HARDWARE_H */

92
board/ti/am64x/evm.c
View File

@ -10,6 +10,14 @@
#include <common.h>
#include <asm/io.h>
#include <spl.h>
#include <asm/arch/hardware.h>
#include <asm/arch/sys_proto.h>
#include <env.h>
#include "../common/board_detect.h"
#define board_is_am64x_gpevm() board_ti_k3_is("AM64-GPEVM")
#define board_is_am64x_skevm() board_ti_k3_is("AM64-SKEVM")
DECLARE_GLOBAL_DATA_PTR;
@ -46,3 +54,87 @@ int board_fit_config_name_match(const char *name)
return -1;
}
#endif
#ifdef CONFIG_TI_I2C_BOARD_DETECT
int do_board_detect(void)
{
int ret;
ret = ti_i2c_eeprom_am6_get_base(CONFIG_EEPROM_BUS_ADDRESS,
CONFIG_EEPROM_CHIP_ADDRESS);
if (ret) {
printf("EEPROM not available at 0x%02x, trying to read at 0x%02x\n",
CONFIG_EEPROM_CHIP_ADDRESS, CONFIG_EEPROM_CHIP_ADDRESS + 1);
ret = ti_i2c_eeprom_am6_get_base(CONFIG_EEPROM_BUS_ADDRESS,
CONFIG_EEPROM_CHIP_ADDRESS + 1);
if (ret)
pr_err("Reading on-board EEPROM at 0x%02x failed %d\n",
CONFIG_EEPROM_CHIP_ADDRESS + 1, ret);
}
return ret;
}
int checkboard(void)
{
struct ti_am6_eeprom *ep = TI_AM6_EEPROM_DATA;
if (!do_board_detect())
printf("Board: %s rev %s\n", ep->name, ep->version);
return 0;
}
#ifdef CONFIG_BOARD_LATE_INIT
static void setup_board_eeprom_env(void)
{
char *name = "am64x_gpevm";
if (do_board_detect())
goto invalid_eeprom;
if (board_is_am64x_gpevm())
name = "am64x_gpevm";
else if (board_is_am64x_skevm())
name = "am64x_skevm";
else
printf("Unidentified board claims %s in eeprom header\n",
board_ti_get_name());
invalid_eeprom:
set_board_info_env_am6(name);
}
static void setup_serial(void)
{
struct ti_am6_eeprom *ep = TI_AM6_EEPROM_DATA;
unsigned long board_serial;
char *endp;
char serial_string[17] = { 0 };
if (env_get("serial#"))
return;
board_serial = simple_strtoul(ep->serial, &endp, 16);
if (*endp != '\0') {
pr_err("Error: Can't set serial# to %s\n", ep->serial);
return;
}
snprintf(serial_string, sizeof(serial_string), "%016lx", board_serial);
env_set("serial#", serial_string);
}
#endif
#endif
#ifdef CONFIG_BOARD_LATE_INIT
int board_late_init(void)
{
if (IS_ENABLED(CONFIG_TI_I2C_BOARD_DETECT)) {
setup_board_eeprom_env();
setup_serial();
}
return 0;
}
#endif