[PATCH 2/6] board: ti: am64x: Add HSE NAND card detection support

Roger Quadros
2023-07-04T18:10:42Z

Add expansion card detection support. Add NAND card detection
support.

am64-sk EVM doesn't support daughtercards so let's restrict
daughtercard probing to am64-evm.

Signed-off-by: Roger Quadros <rogerq@kernel.org>
---
board/ti/am64x/evm.c | 177 +++++++++++++++++++++++++++++++++++++++++++
1 file changed, 177 insertions(+)

diff --git a/board/ti/am64x/evm.c b/board/ti/am64x/evm.c
index 42795cbd22..a7ddee9d64 100644
--- a/board/ti/am64x/evm.c
+++ b/board/ti/am64x/evm.c
@@ -11,8 +11,10 @@
#include <asm/io.h>
#include <dm/uclass.h>
#include <k3-ddrss.h>
+#include <net.h>
#include <spl.h>
#include <fdt_support.h>
+#include <asm/gpio.h>
#include <asm/arch/hardware.h>
#include <env.h>

@@ -24,6 +26,17 @@
#define board_is_am64x_skevm() (board_ti_k3_is("AM64-SKEVM") || \
board_ti_k3_is("AM64B-SKEVM"))

+#define AM64X_MAX_DAUGHTER_CARDS 8
+
+/* Daughter card presence detection signals */
+enum {
+ AM64X_EVM_HSE_BRD_DET,
+ AM64X_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)
@@ -219,10 +232,170 @@ static void setup_serial(void)
snprintf(serial_string, sizeof(serial_string), "%016lx", board_serial);
env_set("serial#", serial_string);
}
+
#endif
#endif

#ifdef CONFIG_BOARD_LATE_INIT
+static const char *k3_dtbo_list[AM64X_MAX_DAUGHTER_CARDS] = {NULL};
+
+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) {
+ pr_err("Failed to lookup gpio %s: %d\n", gpio_name, ret);
+ return ret;
+ }
+
+ /* Request GPIO, simply re-using the name as label */
+ ret = dm_gpio_request(desc, gpio_name);
+ if (ret < 0) {
+ pr_err("Failed to request gpio %s: %d\n", gpio_name, ret);
+ 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[AM64X_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, nb_dtbos = 0;
+ 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[AM64X_EVM_BRD_DET_COUNT] = {
+ { "gpio@38_0", 0x52, }, /* AM64X_EVM_HSE_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[] = {
+ {
+ AM64X_EVM_HSE_BRD_DET,
+ "TMDS64DC02EVM",
+ "k3-am642-evm-nand.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 < AM64X_EVM_BRD_DET_COUNT; i++) {
+ ret = init_daughtercard_det_gpio(slot_map[i].gpio_name,
+ &board_det_gpios[i]);
+ if (ret < 0)
+ return ret;
+ }
+
+ memset(k3_dtbo_list, 0, sizeof(k3_dtbo_list));
+ 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;
+ const char *dtboname;
+
+ /*
+ * 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 rev %s\n", ep.name, ep.version);
+
+#ifndef CONFIG_SPL_BUILD
+ int j;
+ /*
+ * 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]);
+ }
+#endif
+
+ /* Skip if no overlays are to be added */
+ if (!strlen(cards[i].dtbo_name))
+ continue;
+
+ dtboname = cards[i].dtbo_name;
+ k3_dtbo_list[nb_dtbos++] = dtboname;
+
+ /*
+ * 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(dtboname) + 2 >
+ sizeof(name_overlays))
+ return -ENOMEM;
+
+ /* Append to our list of overlays */
+ strcat(name_overlays, dtboname);
+ strcat(name_overlays, " ");
+ }
+
+#ifndef CONFIG_SPL_BUILD
+ /* Apply device tree overlay(s) to the U-Boot environment, if any */
+ if (strlen(name_overlays))
+ return env_set("name_overlays", name_overlays);
+#endif
+
+ return 0;
+}
+
int board_late_init(void)
{
if (IS_ENABLED(CONFIG_TI_I2C_BOARD_DETECT)) {
@@ -237,6 +410,10 @@ int board_late_init(void)
* an index of 1.
*/
board_ti_am6_set_ethaddr(1, ep->mac_addr_cnt);
+
+ /* Check for and probe any plugged-in daughtercards */
+ if (board_is_am64x_evm())
+ probe_daughtercards();
}

return 0;
--
2.34.1