arm: mach-k3: am642: Add support for boot device detection

AM642 allows for booting from primary or backup boot media.
Both media can be chosen individually based on switch settings.
ROM looks for a valid image in primary boot media, if not found
then looks in backup boot media. In order to pass this boot media
information to boot loader, ROM stores a value at a particular
address. Add support for reading this information and determining
the boot media correctly.

Signed-off-by: Keerthy <j-keerthy@ti.com>
Signed-off-by: Dave Gerlach <d-gerlach@ti.com>

1 files changed, 98 insertions, 0 deletions

diff --git a/arch/arm/mach-k3/am642_init.c b/arch/arm/mach-k3/am642_init.c
index 79de049d685..54944af2587 100644
--- a/arch/arm/mach-k3/am642_init.c
+++ b/arch/arm/mach-k3/am642_init.c
@@ -10,6 +10,7 @@
 #include <common.h>
 #include <spl.h>
 #include <asm/io.h>
+#include <asm/arch/hardware.h>
 #include "common.h"
 
 #if defined(CONFIG_SPL_BUILD)
@@ -25,4 +26,101 @@ void board_init_f(ulong dummy)
 
 	preloader_console_init();
 }
+
+u32 spl_boot_mode(const u32 boot_device)
+{
+	switch (boot_device) {
+	case BOOT_DEVICE_MMC1:
+		return MMCSD_MODE_EMMCBOOT;
+
+	case BOOT_DEVICE_MMC2:
+		return MMCSD_MODE_FS;
+
+	default:
+		return MMCSD_MODE_RAW;
+	}
+}
+
+static u32 __get_backup_bootmedia(u32 main_devstat)
+{
+	u32 bkup_bootmode =
+	    (main_devstat & MAIN_DEVSTAT_BACKUP_BOOTMODE_MASK) >>
+	    MAIN_DEVSTAT_BACKUP_BOOTMODE_SHIFT;
+	u32 bkup_bootmode_cfg =
+	    (main_devstat & MAIN_DEVSTAT_BACKUP_BOOTMODE_CFG_MASK) >>
+	    MAIN_DEVSTAT_BACKUP_BOOTMODE_CFG_SHIFT;
+
+	switch (bkup_bootmode) {
+	case BACKUP_BOOT_DEVICE_UART:
+		return BOOT_DEVICE_UART;
+
+	case BACKUP_BOOT_DEVICE_USB:
+		return BOOT_DEVICE_USB;
+
+	case BACKUP_BOOT_DEVICE_ETHERNET:
+		return BOOT_DEVICE_ETHERNET;
+
+	case BACKUP_BOOT_DEVICE_MMC:
+		if (bkup_bootmode_cfg)
+			return BOOT_DEVICE_MMC2;
+		return BOOT_DEVICE_MMC1;
+
+	case BACKUP_BOOT_DEVICE_SPI:
+		return BOOT_DEVICE_SPI;
+
+	case BACKUP_BOOT_DEVICE_I2C:
+		return BOOT_DEVICE_I2C;
+	};
+
+	return BOOT_DEVICE_RAM;
+}
+
+static u32 __get_primary_bootmedia(u32 main_devstat)
+{
+	u32 bootmode = (main_devstat & MAIN_DEVSTAT_PRIMARY_BOOTMODE_MASK) >>
+	    MAIN_DEVSTAT_PRIMARY_BOOTMODE_SHIFT;
+	u32 bootmode_cfg =
+	    (main_devstat & MAIN_DEVSTAT_PRIMARY_BOOTMODE_CFG_MASK) >>
+	    MAIN_DEVSTAT_PRIMARY_BOOTMODE_CFG_SHIFT;
+
+	switch (bootmode) {
+	case BOOT_DEVICE_OSPI:
+		fallthrough;
+	case BOOT_DEVICE_QSPI:
+		fallthrough;
+	case BOOT_DEVICE_XSPI:
+		fallthrough;
+	case BOOT_DEVICE_SPI:
+		return BOOT_DEVICE_SPI;
+
+	case BOOT_DEVICE_ETHERNET_RGMII:
+		fallthrough;
+	case BOOT_DEVICE_ETHERNET_RMII:
+		return BOOT_DEVICE_ETHERNET;
+
+	case BOOT_DEVICE_EMMC:
+		return BOOT_DEVICE_MMC1;
+
+	case BOOT_DEVICE_MMC:
+		if ((bootmode_cfg & MAIN_DEVSTAT_PRIMARY_MMC_PORT_MASK) >>
+		     MAIN_DEVSTAT_PRIMARY_MMC_PORT_SHIFT)
+			return BOOT_DEVICE_MMC2;
+		return BOOT_DEVICE_MMC1;
+
+	case BOOT_DEVICE_NOBOOT:
+		return BOOT_DEVICE_RAM;
+	}
+
+	return bootmode;
+}
+
+u32 spl_boot_device(void)
+{
+	u32 devstat = readl(CTRLMMR_MAIN_DEVSTAT);
+
+	if (bootindex == K3_PRIMARY_BOOTMODE)
+		return __get_primary_bootmedia(devstat);
+	else
+		return __get_backup_bootmedia(devstat);
+}
 #endif