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>
diff --git a/board/ti/common/board_detect.c b/board/ti/common/board_detect.c
index 564d2f7..59ec570 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 @@
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 a45d896..1a85b7f 100644
--- a/board/ti/common/board_detect.h
+++ b/board/ti/common/board_detect.h
@@ -268,6 +268,15 @@
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