[U-Boot] [PATCH 16/18] board: ti: am654: Use EEPROM-based board detection
Andreas Dannenberg
dannenberg at ti.com
Wed May 8 21:37:49 UTC 2019
The TI AM654x EVM base board and the associated daughtercards have on-
board I2C-based EEPROMs containing board configuration data. Use the
board detection infrastructure introduced earlier to do the following:
1) Parse the AM654x EVM base board EEPROM and populate items like board
name and MAC addresses into the TI common EEPROM data structure
residing in SRAM scratch space
2) Check for presence of daughter card(s) by probing the associated
presence signals via an I2C-based GPIO expander. Then, if such a
card is found, parse the data such as additional Ethernet MAC
addresses from its on-board EEPROM and populate into U-Boot
accordingly
3) Dynamically create an U-Boot ENV variable called overlay_files
containing a list of daugherboard-specific DTB overlays based on
daughercards found.
This patch adds support for the AM654x base board ("AM6-COMPROCEVM")
as well as for the IDK ("AM6-IDKAPPEVM"), OLDI LCD ("OLDI-LCD1EVM")
PCIe/USB3.0 ("SER-PCIEUSBEVM"), 2 Lane PCIe/USB2.0 ("SER-PCIE2LEVM"),
and general purpuse ("AM6-GPAPPEVM") daughtercards.
Signed-off-by: Andreas Dannenberg <dannenberg at ti.com>
---
arch/arm/mach-k3/am6_init.c | 4 +
arch/arm/mach-k3/include/mach/sys_proto.h | 2 +
board/ti/am65x/Kconfig | 7 +
board/ti/am65x/evm.c | 241 ++++++++++++++++++++++
include/configs/am65x_evm.h | 9 +-
5 files changed, 257 insertions(+), 6 deletions(-)
diff --git a/arch/arm/mach-k3/am6_init.c b/arch/arm/mach-k3/am6_init.c
index 60a580305d..72bce7ce43 100644
--- a/arch/arm/mach-k3/am6_init.c
+++ b/arch/arm/mach-k3/am6_init.c
@@ -10,6 +10,7 @@
#include <asm/io.h>
#include <spl.h>
#include <asm/arch/hardware.h>
+#include <asm/arch/sys_proto.h>
#include "common.h"
#include <dm.h>
@@ -86,6 +87,9 @@ void board_init_f(ulong dummy)
/* Prepare console output */
preloader_console_init();
+ /* Perform EEPROM-based board detection */
+ do_board_detect();
+
#ifdef CONFIG_K3_AM654_DDRSS
ret = uclass_get_device(UCLASS_RAM, 0, &dev);
if (ret)
diff --git a/arch/arm/mach-k3/include/mach/sys_proto.h b/arch/arm/mach-k3/include/mach/sys_proto.h
index 018725b4d1..787a274492 100644
--- a/arch/arm/mach-k3/include/mach/sys_proto.h
+++ b/arch/arm/mach-k3/include/mach/sys_proto.h
@@ -12,4 +12,6 @@ u32 wait_on_value(u32 read_bit_mask, u32 match_value, void *read_addr,
u32 bound);
struct ti_sci_handle *get_ti_sci_handle(void);
int fdt_fixup_msmc_ram(void *blob, char *parent_path, char *node_name);
+int do_board_detect(void);
+
#endif
diff --git a/board/ti/am65x/Kconfig b/board/ti/am65x/Kconfig
index 98172c28f5..64d9b8cdae 100644
--- a/board/ti/am65x/Kconfig
+++ b/board/ti/am65x/Kconfig
@@ -12,6 +12,8 @@ config TARGET_AM654_A53_EVM
select ARM64
select SOC_K3_AM6
select SYS_DISABLE_DCACHE_OPS
+ select BOARD_LATE_INIT
+ imply TI_I2C_BOARD_DETECT
config TARGET_AM654_R5_EVM
bool "TI K3 based AM654 EVM running on R5"
@@ -20,6 +22,7 @@ config TARGET_AM654_R5_EVM
select SOC_K3_AM6
select K3_AM654_DDRSS
imply SYS_K3_SPL_ATF
+ imply TI_I2C_BOARD_DETECT
endchoice
@@ -34,6 +37,8 @@ config SYS_VENDOR
config SYS_CONFIG_NAME
default "am65x_evm"
+source "board/ti/common/Kconfig"
+
endif
if TARGET_AM654_R5_EVM
@@ -50,4 +55,6 @@ config SYS_CONFIG_NAME
config SPL_LDSCRIPT
default "arch/arm/mach-omap2/u-boot-spl.lds"
+source "board/ti/common/Kconfig"
+
endif
diff --git a/board/ti/am65x/evm.c b/board/ti/am65x/evm.c
index 52f5d6b11e..7bd8c4fa66 100644
--- a/board/ti/am65x/evm.c
+++ b/board/ti/am65x/evm.c
@@ -8,10 +8,31 @@
*/
#include <common.h>
+#include <dm.h>
+#include <asm/arch/sys_proto.h>
+#include <asm/arch/hardware.h>
+#include <asm/gpio.h>
#include <asm/io.h>
+#include <asm/omap_common.h>
#include <spl.h>
#include <asm/arch/sys_proto.h>
+#include "../common/board_detect.h"
+
+#define board_is_am65x_base_board() board_ti_is("AM6-COMPROCEVM")
+
+/* Daughter card presence detection signals */
+enum {
+ AM65X_EVM_APP_BRD_DET,
+ AM65X_EVM_LCD_BRD_DET,
+ AM65X_EVM_SERDES_BRD_DET,
+ AM65X_EVM_HDMI_GPMC_BRD_DET,
+ AM65X_EVM_BRD_DET_COUNT,
+};
+
+/* Max number of MAC addresses that are parsed/processed per daughter card */
+#define DAUGHTER_CARD_NO_OF_MAC_ADDR 8
+
DECLARE_GLOBAL_DATA_PTR;
int board_init(void)
@@ -80,3 +101,223 @@ int ft_board_setup(void *blob, bd_t *bd)
return ret;
}
#endif
+
+int do_board_detect(void)
+{
+ int ret;
+
+ ret = ti_i2c_eeprom_am6_get_base(CONFIG_EEPROM_BUS_ADDRESS,
+ CONFIG_EEPROM_CHIP_ADDRESS);
+ if (ret)
+ pr_err("Reading on-board EEPROM at 0x%02x failed %d\n",
+ CONFIG_EEPROM_CHIP_ADDRESS, ret);
+
+ return ret;
+}
+
+static void setup_board_eeprom_env(void)
+{
+ char *name = "am65x";
+
+ if (do_board_detect())
+ goto invalid_eeprom;
+
+ if (board_is_am65x_base_board())
+ name = "am65x";
+ else
+ printf("Unidentified board claims %s in eeprom header\n",
+ board_ti_get_name());
+
+invalid_eeprom:
+ set_board_info_env_am6(name);
+}
+
+static int init_daughtercard_det_gpio(char *gpio_name, struct gpio_desc *desc)
+{
+ int ret;
+
+ memset(desc, 0, sizeof(*desc));
+
+ ret = dm_gpio_lookup_name(gpio_name, desc);
+ if (ret < 0)
+ return ret;
+
+ /* Request GPIO, simply re-using the name as label */
+ ret = dm_gpio_request(desc, gpio_name);
+ if (ret < 0)
+ return ret;
+
+ return dm_gpio_set_dir_flags(desc, GPIOD_IS_IN);
+}
+
+static int probe_daughtercards(void)
+{
+ struct ti_am6_eeprom ep;
+ struct gpio_desc board_det_gpios[AM65X_EVM_BRD_DET_COUNT];
+ char mac_addr[DAUGHTER_CARD_NO_OF_MAC_ADDR][TI_EEPROM_HDR_ETH_ALEN];
+ u8 mac_addr_cnt;
+ char name_overlays[1024] = { 0 };
+ int i, j;
+ int ret;
+
+ /*
+ * Daughter card presence detection signal name to GPIO (via I2C I/O
+ * expander @ address 0x38) name and EEPROM I2C address mapping.
+ */
+ const struct {
+ char *gpio_name;
+ u8 i2c_addr;
+ } slot_map[AM65X_EVM_BRD_DET_COUNT] = {
+ { "gpio at 38_0", 0x52, }, /* AM65X_EVM_APP_BRD_DET */
+ { "gpio at 38_1", 0x55, }, /* AM65X_EVM_LCD_BRD_DET */
+ { "gpio at 38_2", 0x54, }, /* AM65X_EVM_SERDES_BRD_DET */
+ { "gpio at 38_3", 0x53, }, /* AM65X_EVM_HDMI_GPMC_BRD_DET */
+ };
+
+ /* Declaration of daughtercards to probe */
+ const struct {
+ u8 slot_index; /* Slot the card is installed */
+ char *card_name; /* EEPROM-programmed card name */
+ char *dtbo_name; /* Device tree overlay to apply */
+ u8 eth_offset; /* ethXaddr MAC address index offset */
+ } cards[] = {
+ {
+ AM65X_EVM_APP_BRD_DET,
+ "AM6-GPAPPEVM",
+ "k3-am654-gp.dtbo",
+ 0,
+ },
+ {
+ AM65X_EVM_APP_BRD_DET,
+ "AM6-IDKAPPEVM",
+ "k3-am654-idk.dtbo",
+ 3,
+ },
+ {
+ AM65X_EVM_SERDES_BRD_DET,
+ "SER-PCIE2LEVM",
+ "k3-am654-pcie-usb2.dtbo",
+ 0,
+ },
+ {
+ AM65X_EVM_SERDES_BRD_DET,
+ "SER-PCIEUSBEVM",
+ "k3-am654-pcie-usb3.dtbo",
+ 0,
+ },
+ {
+ AM65X_EVM_LCD_BRD_DET,
+ "OLDI-LCD1EVM",
+ "k3-am654-evm-oldi-lcd1evm.dtbo",
+ 0,
+ },
+ };
+
+ /*
+ * Initialize GPIO used for daughtercard slot presence detection and
+ * keep the resulting handles in local array for easier access.
+ */
+ for (i = 0; i < AM65X_EVM_BRD_DET_COUNT; i++) {
+ ret = init_daughtercard_det_gpio(slot_map[i].gpio_name,
+ &board_det_gpios[i]);
+ if (ret < 0)
+ return ret;
+ }
+
+ for (i = 0; i < ARRAY_SIZE(cards); i++) {
+ /* Obtain card-specific slot index and associated I2C address */
+ u8 slot_index = cards[i].slot_index;
+ u8 i2c_addr = slot_map[slot_index].i2c_addr;
+
+ /*
+ * The presence detection signal is active-low, hence skip
+ * over this card slot if anything other than 0 is returned.
+ */
+ ret = dm_gpio_get_value(&board_det_gpios[slot_index]);
+ if (ret < 0)
+ return ret;
+ else if (ret)
+ continue;
+
+ /* Get and parse the daughter card EEPROM record */
+ ret = ti_i2c_eeprom_am6_get(CONFIG_EEPROM_BUS_ADDRESS, i2c_addr,
+ &ep,
+ (char **)mac_addr,
+ DAUGHTER_CARD_NO_OF_MAC_ADDR,
+ &mac_addr_cnt);
+ if (ret) {
+ pr_err("Reading daughtercard EEPROM at 0x%02x failed %d\n",
+ i2c_addr, ret);
+ /*
+ * Even this is pretty serious let's just skip over
+ * this particular daughtercard, rather than ending
+ * the probing process altogether.
+ */
+ continue;
+ }
+
+ /* Only process the parsed data if we found a match */
+ if (strncmp(ep.name, cards[i].card_name, sizeof(ep.name)))
+ continue;
+
+ printf("detected %s\n", cards[i].card_name);
+
+ /*
+ * Populate any MAC addresses from daughtercard into the U-Boot
+ * environment, starting with a card-specific offset so we can
+ * have multiple cards contribute to the MAC pool in a well-
+ * defined manner.
+ */
+ for (j = 0; j < mac_addr_cnt; j++) {
+ if (!is_valid_ethaddr((u8 *)mac_addr[j]))
+ continue;
+
+ eth_env_set_enetaddr_by_index("eth",
+ cards[i].eth_offset + j,
+ (uchar *)mac_addr[j]);
+ }
+
+ /* Skip if no overlays are to be added */
+ if (!strlen(cards[i].dtbo_name))
+ continue;
+
+ /*
+ * Make sure we are not running out of buffer space by checking
+ * if we can fit the new overlay, a trailing space to be used
+ * as a separator, plus the terminating zero.
+ */
+ if (strlen(name_overlays) + strlen(cards[i].dtbo_name) + 2 >
+ sizeof(name_overlays))
+ return -ENOMEM;
+
+ /* Append to our list of overlays */
+ strcat(name_overlays, cards[i].dtbo_name);
+ strcat(name_overlays, " ");
+ }
+
+ /* Apply device tree overlay(s) to the U-Boot environment, if any */
+ if (strlen(name_overlays))
+ return env_set("name_overlays", name_overlays);
+
+ return 0;
+}
+
+int board_late_init(void)
+{
+ struct ti_am6_eeprom *ep = TI_AM6_EEPROM_DATA;
+
+ setup_board_eeprom_env();
+
+ /*
+ * The first MAC address for ethernet a.k.a. ethernet0 comes from
+ * efuse populated via the am654 gigabit eth switch subsystem driver.
+ * All the other ones are populated via EEPROM, hence continue with
+ * an index of 1.
+ */
+ board_ti_am6_set_ethaddr(1, ep->mac_addr_cnt);
+
+ /* Check for and probe any plugged-in daughtercards */
+ probe_daughtercards();
+
+ return 0;
+}
diff --git a/include/configs/am65x_evm.h b/include/configs/am65x_evm.h
index b043bf886b..7e3d6a3b8f 100644
--- a/include/configs/am65x_evm.h
+++ b/include/configs/am65x_evm.h
@@ -37,12 +37,9 @@
/* U-Boot general configuration */
#define EXTRA_ENV_AM65X_BOARD_SETTINGS \
"findfdt=" \
- "if test $board_name = am65x; then " \
- "setenv name_fdt k3-am654-base-board.dtb; " \
- "else if test $name_fdt = undefined; then " \
- "echo WARNING: Could not determine device tree to use;"\
- "fi; fi; " \
- "setenv fdtfile ${name_fdt}\0" \
+ "setenv name_fdt k3-am654-base-board.dtb;" \
+ "setenv fdtfile ${name_fdt};" \
+ "setenv overlay_files ${name_overlays}\0" \
"loadaddr=0x80080000\0" \
"fdtaddr=0x82000000\0" \
"name_kern=Image\0" \
--
2.17.1
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