arm: exynos: Read default MMC device from XOM[7:5] pins
XOM pins provide information for iROM bootloader about the boot device.
Those pins are mapped to lower bits of OP_MODE register (0x10000008),
which is common for all Exynos SoC variants. Set the default MMC device id
to reflect the boot device selected by XOM[7:5] pins (2 for the SD or 0 for
the eMMC).
Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com>
Signed-off-by: Minkyu Kang <mk7.kang@samsung.com>
diff --git a/board/samsung/common/board.c b/board/samsung/common/board.c
index 5d4646d..390060e 100644
--- a/board/samsung/common/board.c
+++ b/board/samsung/common/board.c
@@ -25,6 +25,8 @@
#include <asm/arch/sromc.h>
#include <lcd.h>
#include <i2c.h>
+#include <mmc.h>
+#include <stdio_dev.h>
#include <usb.h>
#include <dwc3-uboot.h>
#include <samsung/misc.h>
@@ -43,6 +45,20 @@
return 0;
}
+/**
+ * get_boot_mmc_dev() - read boot MMC device id from XOM[7:5] pins.
+ */
+static int get_boot_mmc_dev(void)
+{
+ u32 mode = readl(EXYNOS4_OP_MODE) & 0x1C;
+
+ if (mode == 0x04)
+ return 2; /* MMC2: SD */
+
+ /* MMC0: eMMC or unknown */
+ return 0;
+}
+
#if defined CONFIG_EXYNOS_TMU
/* Boot Time Thermal Analysis for SoC temperature threshold breach */
static void boot_temp_check(void)
@@ -281,6 +297,8 @@
{
struct udevice *dev;
int ret;
+ int mmcbootdev = get_boot_mmc_dev();
+ char mmcbootdev_str[16];
stdio_print_current_devices();
ret = uclass_first_device_err(UCLASS_CROS_EC, &dev);
@@ -293,6 +311,11 @@
panic("Cannot init cros-ec device");
return -1;
}
+
+ printf("Boot device: MMC(%u)\n", mmcbootdev);
+ sprintf(mmcbootdev_str, "%u", mmcbootdev);
+ env_set("mmcbootdev", mmcbootdev_str);
+
return 0;
}
#endif
@@ -360,3 +383,8 @@
#endif
return 0;
}
+
+int mmc_get_env_dev(void)
+{
+ return get_boot_mmc_dev();
+}