board: ti: beagleboneai: emmc read changes

BeagleBoard.org BeagleBone AI rev A1 does not include a board
identifier I2C EEPROM due to a design oversight. These boards have
been put into production and are generally available now.

The board identifier information, however, has been included in the
second eMMC linear boot partition (/dev/mmcblk1boot1).

This patch works by:
* First, looking for a board identifier I2C EEPROM and if not found,
* Then seeing if the boot mode matches BeagleBone AI with eMMC in the
  boot chain to make sure we don't enable eMMC pinmuxes on boards
  that don't support it, and
* Finally, initializes the eMMC pins and reading the header.

Signed-off-by: Jason Kridner <jdk@ti.com>
Signed-off-by: Caleb Robey <c-robey@ti.com>
Cc: Robert Nelson <robertcnelson@gmail.com>
Signed-off-by: Lokesh Vutla <lokeshvutla@ti.com>

4 files changed, 138 insertions, 0 deletions

diff --git a/board/ti/am57xx/board.c b/board/ti/am57xx/board.c
index c755821b74..52f5e954e6 100644
--- a/board/ti/am57xx/board.c
+++ b/board/ti/am57xx/board.c
@@ -14,6 +14,7 @@
 #include <sata.h>
 #include <serial.h>
 #include <usb.h>
+#include <errno.h>
 #include <asm/omap_common.h>
 #include <asm/omap_sec_common.h>
 #include <asm/emif.h>
@@ -37,6 +38,10 @@
 #include "../common/board_detect.h"
 #include "mux_data.h"
 
+#ifdef CONFIG_SUPPORT_EMMC_BOOT
+static int board_bootmode_has_emmc(void);
+#endif
+
 #define board_is_x15()		board_ti_is("BBRDX15_")
 #define board_is_x15_revb1()	(board_ti_is("BBRDX15_") && \
 				 !strncmp("B.10", board_ti_get_rev(), 3))
@@ -507,6 +512,14 @@ void do_board_detect(void)
 				  CONFIG_EEPROM_CHIP_ADDRESS);
 	if (rc)
 		printf("ti_i2c_eeprom_init failed %d\n", rc);
+
+#ifdef CONFIG_SUPPORT_EMMC_BOOT
+	rc = board_bootmode_has_emmc();
+	if (!rc)
+		rc = ti_emmc_boardid_get();
+	if (rc)
+		printf("ti_emmc_boardid_get failed %d\n", rc);
+#endif
 }
 
 #else	/* CONFIG_SPL_BUILD */
@@ -522,6 +535,14 @@ void do_board_detect(void)
 	if (rc)
 		printf("ti_i2c_eeprom_init failed %d\n", rc);
 
+#ifdef CONFIG_SUPPORT_EMMC_BOOT
+	rc = board_bootmode_has_emmc();
+	if (!rc)
+		rc = ti_emmc_boardid_get();
+	if (rc)
+		printf("ti_emmc_boardid_get failed %d\n", rc);
+#endif
+
 	if (board_is_x15())
 		bname = "BeagleBoard X15";
 	else if (board_is_am572x_evm())
@@ -744,6 +765,11 @@ void set_muxconf_regs(void)
 {
 	do_set_mux32((*ctrl)->control_padconf_core_base,
 		     early_padconf, ARRAY_SIZE(early_padconf));
+
+#ifdef CONFIG_SUPPORT_EMMC_BOOT
+	do_set_mux32((*ctrl)->control_padconf_core_base,
+		     emmc_padconf, ARRAY_SIZE(emmc_padconf));
+#endif
 }
 
 #ifdef CONFIG_IODELAY_RECALIBRATION
@@ -1113,6 +1139,17 @@ int fastboot_set_reboot_flag(void)
 }
 #endif
 
+#ifdef CONFIG_SUPPORT_EMMC_BOOT
+static int board_bootmode_has_emmc(void)
+{
+	/* Check that boot mode is same as BBAI */
+	if (gd->arch.omap_boot_mode != 2)
+		return -EIO;
+
+	return 0;
+}
+#endif
+
 #ifdef CONFIG_TI_SECURE_DEVICE
 void board_fit_image_post_process(void **p_image, size_t *p_size)
 {
diff --git a/board/ti/am57xx/mux_data.h b/board/ti/am57xx/mux_data.h
index d4a15ae93d..51df977817 100644
--- a/board/ti/am57xx/mux_data.h
+++ b/board/ti/am57xx/mux_data.h
@@ -1000,6 +1000,22 @@ const struct pad_conf_entry early_padconf[] = {
 	{I2C1_SCL, (PIN_INPUT_PULLUP | M0)},	/* I2C1_SCL */
 };
 
+#ifdef CONFIG_SUPPORT_EMMC_BOOT
+const struct pad_conf_entry emmc_padconf[] = {
+	{GPMC_A19, (M1 | PIN_INPUT_PULLUP)},		    /*  K7: gpmc_a19.mmc2_dat4 */
+	{GPMC_A20, (M1 | PIN_INPUT_PULLUP)},		    /*  M7: gpmc_a20.mmc2_dat5 */
+	{GPMC_A21, (M1 | PIN_INPUT_PULLUP)},		    /*  J5: gpmc_a21.mmc2_dat6 */
+	{GPMC_A22, (M1 | PIN_INPUT_PULLUP)},		    /*  K6: gpmc_a22.mmc2_dat7 */
+	{GPMC_A23, (M1 | PIN_INPUT_PULLUP)},		    /*  J7: gpmc_a23.mmc2_clk */
+	{GPMC_A24, (M1 | PIN_INPUT_PULLUP)},		    /*  J4: gpmc_a24.mmc2_dat0 */
+	{GPMC_A25, (M1 | PIN_INPUT_PULLUP)},		    /*  J6: gpmc_a25.mmc2_dat1 */
+	{GPMC_A26, (M1 | PIN_INPUT_PULLUP)},		    /*  H4: gpmc_a26.mmc2_dat2 */
+	{GPMC_A27, (M1 | PIN_INPUT_PULLUP)},		    /*  H5: gpmc_a27.mmc2_dat3 */
+	{GPMC_CS1, (M1 | PIN_INPUT_PULLUP)},		    /*  H6: gpmc_cs1.mmc2_cmd */
+	{MCASP1_AXR5, (M14 | PIN_OUTPUT_PULLUP)},	       /* F13: eMMC_RSTn (missing on schematic): mcasp1_axr5.gpio5_7 */
+};
+#endif
+
 #ifdef CONFIG_IODELAY_RECALIBRATION
 const struct iodelay_cfg_entry iodelay_cfg_array_x15_sr1_1[] = {
 	{0x0114, 2980, 0},	/* CFG_GPMC_A0_IN */
diff --git a/board/ti/common/board_detect.c b/board/ti/common/board_detect.c
index 564d2f7046..59ec57062d 100644
--- a/board/ti/common/board_detect.c
+++ b/board/ti/common/board_detect.c
@@ -14,6 +14,9 @@
 #include <dm/uclass.h>
 #include <env.h>
 #include <i2c.h>
+#include <mmc.h>
+#include <errno.h>
+#include <malloc.h>
 
 #include "board_detect.h"
 
@@ -171,6 +174,79 @@ static int __maybe_unused ti_i2c_eeprom_get(int bus_addr, int dev_addr,
 	return 0;
 }
 
+int __maybe_unused ti_emmc_boardid_get(void)
+{
+	int rc;
+	struct udevice *dev;
+	struct mmc *mmc;
+	struct ti_common_eeprom *ep;
+	struct ti_am_eeprom brdid;
+	struct blk_desc *bdesc;
+	uchar *buffer;
+
+	ep = TI_EEPROM_DATA;
+	if (ep->header == TI_EEPROM_HEADER_MAGIC)
+		return 0;       /* EEPROM has already been read */
+
+	/* Initialize with a known bad marker for emmc fails.. */
+	ep->header = TI_DEAD_EEPROM_MAGIC;
+	ep->name[0] = 0x0;
+	ep->version[0] = 0x0;
+	ep->serial[0] = 0x0;
+	ep->config[0] = 0x0;
+
+	/* uclass object initialization */
+	rc = mmc_initialize(NULL);
+	if (rc)
+		return rc;
+
+	/* Set device to /dev/mmcblk1 */
+	rc = uclass_get_device(UCLASS_MMC, 1, &dev);
+	if (rc)
+		return rc;
+
+	/* Grab the mmc device */
+	mmc = mmc_get_mmc_dev(dev);
+	if (!mmc)
+		return -ENODEV;
+
+	/* mmc hardware initialization routine */
+	mmc_init(mmc);
+
+	/* Set partition to /dev/mmcblk1boot1 */
+	rc = mmc_switch_part(mmc, 2);
+	if (rc)
+		return rc;
+
+	buffer = malloc(mmc->read_bl_len);
+	if (!buffer)
+		return -ENOMEM;
+
+	bdesc = mmc_get_blk_desc(mmc);
+
+	/* blk_dread returns the number of blocks read*/
+	if (blk_dread(bdesc, 0L, 1, buffer) != 1) {
+		rc = -EIO;
+		goto cleanup;
+	}
+
+	memcpy(&brdid, buffer, sizeof(brdid));
+
+	/* Write out the ep struct values */
+	ep->header = brdid.header;
+	strlcpy(ep->name, brdid.name, TI_EEPROM_HDR_NAME_LEN + 1);
+	ti_eeprom_string_cleanup(ep->name);
+	strlcpy(ep->version, brdid.version, TI_EEPROM_HDR_REV_LEN + 1);
+	ti_eeprom_string_cleanup(ep->version);
+	strlcpy(ep->serial, brdid.serial, TI_EEPROM_HDR_SERIAL_LEN + 1);
+	ti_eeprom_string_cleanup(ep->serial);
+
+cleanup:
+	free(buffer);
+
+	return rc;
+}
+
 int __maybe_unused ti_i2c_eeprom_am_set(const char *name, const char *rev)
 {
 	struct ti_common_eeprom *ep;
diff --git a/board/ti/common/board_detect.h b/board/ti/common/board_detect.h
index a45d8961b9..1a85b7fda9 100644
--- a/board/ti/common/board_detect.h
+++ b/board/ti/common/board_detect.h
@@ -268,6 +268,15 @@ struct ti_am6_eeprom {
 int ti_i2c_eeprom_am_get(int bus_addr, int dev_addr);
 
 /**
+ * ti_emmc_boardid_get() - Fetch board ID information from eMMC
+ *
+ * ep in SRAM is populated by the this function that is currently
+ * based on BeagleBone AI, but could be made more general across AM*
+ * platforms.
+ */
+int __maybe_unused ti_emmc_boardid_get(void);
+
+/**
  * ti_i2c_eeprom_dra7_get() - Consolidated eeprom data for DRA7 TI EVMs
  * @bus_addr:	I2C bus address
  * @dev_addr:	I2C slave address