arm: K3: am654: Add support for boot device detection

AM654 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: Lokesh Vutla <lokeshvutla@ti.com>
Signed-off-by: Andreas Dannenberg <dannenberg@ti.com>
Signed-off-by: Vignesh R <vigneshr@ti.com>
Reviewed-by: Tom Rini <trini@konsulko.com>

arch/arm/include/asm/spl.h

@@ -8,7 +8,7 @@
 
 #if defined(CONFIG_ARCH_OMAP2PLUS) \
 	|| defined(CONFIG_EXYNOS4) || defined(CONFIG_EXYNOS5) \
-	|| defined(CONFIG_EXYNOS4210)
+	|| defined(CONFIG_EXYNOS4210) || defined(CONFIG_ARCH_K3)
 /* Platform-specific defines */
 #include <asm/arch/spl.h>
 

arch/arm/mach-k3/Kconfig

@@ -40,4 +40,11 @@ config SYS_K3_MCU_SCRATCHPAD_SIZE
 	help
 	  Describes the size of MCU Scratchpad RAM.
 
+config SYS_K3_BOOT_PARAM_TABLE_INDEX
+	hex
+	default 0x41c7fbfc if SOC_K3_AM6
+	help
+	  Address at which ROM stores the value which determines if SPL
+	  is booted up by primary boot media or secondary boot media.
+
 endif

arch/arm/mach-k3/am6_init.c

@@ -7,11 +7,26 @@
  */
 
 #include <common.h>
+#include <asm/io.h>
 #include <spl.h>
+#include <asm/arch/hardware.h>
 
 #ifdef CONFIG_SPL_BUILD
+static void store_boot_index_from_rom(void)
+{
+	u32 *boot_index = (u32 *)K3_BOOT_PARAM_TABLE_INDEX_VAL;
+
+	*boot_index = *(u32 *)(CONFIG_SYS_K3_BOOT_PARAM_TABLE_INDEX);
+}
+
 void board_init_f(ulong dummy)
 {
+	/*
+	 * Cannot delay this further as there is a chance that
+	 * K3_BOOT_PARAM_TABLE_INDEX can be over written by SPL MALLOC section.
+	 */
+	store_boot_index_from_rom();
+
 	/* Init DM early in-order to invoke system controller */
 	spl_early_init();
 
@@ -19,9 +34,50 @@ void board_init_f(ulong dummy)
 	preloader_console_init();
 }
 
+static u32 __get_backup_bootmedia(u32 devstat)
+{
+	u32 bkup_boot = (devstat & CTRLMMR_MAIN_DEVSTAT_BKUP_BOOTMODE_MASK) >>
+			CTRLMMR_MAIN_DEVSTAT_BKUP_BOOTMODE_SHIFT;
+
+	switch (bkup_boot) {
+	case BACKUP_BOOT_DEVICE_USB:
+		return BOOT_DEVICE_USB;
+	case BACKUP_BOOT_DEVICE_UART:
+		return BOOT_DEVICE_UART;
+	case BACKUP_BOOT_DEVICE_ETHERNET:
+		return BOOT_DEVICE_ETHERNET;
+	case BACKUP_BOOT_DEVICE_MMC2:
+		return BOOT_DEVICE_MMC2;
+	case BACKUP_BOOT_DEVICE_SPI:
+		return BOOT_DEVICE_SPI;
+	case BACKUP_BOOT_DEVICE_HYPERFLASH:
+		return BOOT_DEVICE_HYPERFLASH;
+	case BACKUP_BOOT_DEVICE_I2C:
+		return BOOT_DEVICE_I2C;
+	};
+
+	return BOOT_DEVICE_RAM;
+}
+
+static u32 __get_primary_bootmedia(u32 devstat)
+{
+	u32 bootmode = devstat & CTRLMMR_MAIN_DEVSTAT_BOOTMODE_MASK;
+
+	if (bootmode == BOOT_DEVICE_OSPI || bootmode ==	BOOT_DEVICE_QSPI)
+		bootmode = BOOT_DEVICE_SPI;
+
+	return bootmode;
+}
+
 u32 spl_boot_device(void)
 {
-	return BOOT_DEVICE_RAM;
+	u32 devstat = readl(CTRLMMR_MAIN_DEVSTAT);
+	u32 bootindex = readl(K3_BOOT_PARAM_TABLE_INDEX_VAL);
+
+	if (bootindex == K3_PRIMARY_BOOTMODE)
+		return __get_primary_bootmedia(devstat);
+	else
+		return __get_backup_bootmedia(devstat);
 }
 #endif
 

arch/arm/mach-k3/include/mach/am6_hardware.h

@@ -0,0 +1,23 @@
+/* SPDX-License-Identifier: GPL-2.0+ */
+/*
+ * K3: AM6 SoC definitions, structures etc.
+ *
+ * (C) Copyright (C) 2018 Texas Instruments Incorporated - http://www.ti.com/
+ */
+#ifndef __ASM_ARCH_AM6_HARDWARE_H
+#define __ASM_ARCH_AM6_HARDWARE_H
+
+#include <config.h>
+
+#define CTRL_MMR0_BASE					0x00100000
+#define CTRLMMR_MAIN_DEVSTAT				(CTRL_MMR0_BASE + 0x30)
+
+#define CTRLMMR_MAIN_DEVSTAT_BOOTMODE_MASK		GENMASK(3, 0)
+#define CTRLMMR_MAIN_DEVSTAT_BOOTMODE_SHIFT		0
+#define CTRLMMR_MAIN_DEVSTAT_BKUP_BOOTMODE_MASK		GENMASK(6, 4)
+#define CTRLMMR_MAIN_DEVSTAT_BKUP_BOOTMODE_SHIFT	4
+
+/* MCU SCRATCHPAD usage */
+#define K3_BOOT_PARAM_TABLE_INDEX_VAL	CONFIG_SYS_K3_MCU_SCRATCHPAD_BASE
+
+#endif /* __ASM_ARCH_AM6_HARDWARE_H */

arch/arm/mach-k3/include/mach/am6_spl.h

@@ -0,0 +1,36 @@
+/* SPDX-License-Identifier: GPL-2.0+ */
+/*
+ * Copyright (C) 2018 Texas Instruments Incorporated - http://www.ti.com/
+ *	Lokesh Vutla <lokeshvutla@ti.com>
+ */
+#ifndef _ASM_ARCH_AM6_SPL_H_
+#define _ASM_ARCH_AM6_SPL_H_
+
+#define BOOT_DEVICE_RAM			0x00
+#define BOOT_DEVICE_OSPI		0x01
+#define BOOT_DEVICE_QSPI		0x02
+#define BOOT_DEVICE_HYPERFLASH		0x03
+#define BOOT_DEVICE_SPI			0x04
+#define BOOT_DEVICE_I2C			0x05
+#define BOOT_DEVICE_MMC2		0x06
+#define BOOT_DEVICE_ETHERNET		0x07
+#define BOOT_DEVICE_USB			0x08
+#define BOOT_DEVICE_PCIE		0x09
+#define BOOT_DEVICE_UART		0x0a
+#define BOOT_DEVICE_NAND		0x0c
+#define BOOT_DEVICE_MMC1		0x0d
+#define BOOT_DEVICE_MMC2_2		0x0e
+
+#define BACKUP_BOOT_DEVICE_RAM		0x0
+#define BACKUP_BOOT_DEVICE_USB		0x1
+#define BACKUP_BOOT_DEVICE_UART		0x2
+#define BACKUP_BOOT_DEVICE_ETHERNET	0x3
+#define BACKUP_BOOT_DEVICE_MMC2		0x4
+#define BACKUP_BOOT_DEVICE_SPI		0x5
+#define BACKUP_BOOT_DEVICE_HYPERFLASH	0x6
+#define BACKUP_BOOT_DEVICE_I2C		0x7
+
+#define K3_PRIMARY_BOOTMODE		0x0
+#define K3_BACKUP_BOOTMODE		0x1
+
+#endif

arch/arm/mach-k3/include/mach/hardware.h

@@ -0,0 +1,12 @@
+/* SPDX-License-Identifier: GPL-2.0+ */
+/*
+ * Copyright (C) 2018 Texas Instruments Incorporated - http://www.ti.com/
+ *	Lokesh Vutla <lokeshvutla@ti.com>
+ */
+#ifndef _ASM_ARCH_HARDWARE_H_
+#define _ASM_ARCH_HARDWARE_H_
+
+#ifdef CONFIG_SOC_K3_AM6
+#include "am6_hardware.h"
+#endif
+#endif /* _ASM_ARCH_HARDWARE_H_ */

arch/arm/mach-k3/include/mach/spl.h

@@ -0,0 +1,12 @@
+/* SPDX-License-Identifier: GPL-2.0+ */
+/*
+ * Copyright (C) 2018 Texas Instruments Incorporated - http://www.ti.com/
+ *	Lokesh Vutla <lokeshvutla@ti.com>
+ */
+#ifndef _ASM_ARCH_SPL_H_
+#define _ASM_ARCH_SPL_H_
+
+#ifdef CONFIG_SOC_K3_AM6
+#include "am6_spl.h"
+#endif
+#endif /* _ASM_ARCH_SPL_H_ */