u-boot/arch/arm/cpu/armv7/omap3/boot.c

/*
 * OMAP3 boot
 *
 * Copyright (C) 2015 Paul Kocialkowski <contact@paulk.fr>
 *
 * SPDX-License-Identifier:	GPL-2.0+
 */

#include <common.h>
#include <asm/io.h>
#include <asm/arch/sys_proto.h>
#include <spl.h>

static u32 boot_devices[] = {
	BOOT_DEVICE_ONENAND,
	BOOT_DEVICE_NAND,
	BOOT_DEVICE_ONENAND,
	BOOT_DEVICE_MMC2,
	BOOT_DEVICE_ONENAND,
	BOOT_DEVICE_MMC2,
	BOOT_DEVICE_MMC1,
	BOOT_DEVICE_XIP,
	BOOT_DEVICE_XIPWAIT,
	BOOT_DEVICE_MMC2,
	BOOT_DEVICE_XIP,
	BOOT_DEVICE_XIPWAIT,
	BOOT_DEVICE_NAND,
	BOOT_DEVICE_XIP,
	BOOT_DEVICE_XIPWAIT,
	BOOT_DEVICE_NAND,
	BOOT_DEVICE_ONENAND,
	BOOT_DEVICE_MMC2,
	BOOT_DEVICE_MMC1,
	BOOT_DEVICE_XIP,
	BOOT_DEVICE_XIPWAIT,
	BOOT_DEVICE_NAND,
	BOOT_DEVICE_ONENAND,
	BOOT_DEVICE_MMC2,
	BOOT_DEVICE_MMC1,
	BOOT_DEVICE_XIP,
	BOOT_DEVICE_XIPWAIT,
	BOOT_DEVICE_NAND,
	BOOT_DEVICE_MMC2_2,
};

u32 omap_sys_boot_device(void)
{
	struct ctrl *ctrl_base = (struct ctrl *)OMAP34XX_CTRL_BASE;
	u32 sys_boot;

	/* Grab the first 5 bits of the status register for SYS_BOOT. */
	sys_boot = readl(&ctrl_base->status) & ((1 << 5) - 1);

	if (sys_boot >= (sizeof(boot_devices) / sizeof(u32)))
		return BOOT_DEVICE_NONE;

	return boot_devices[sys_boot];
}

char omap_reboot_mode(void)
{
	u32 reboot_mode;
	char c;

	reboot_mode = readl((u32 *)(OMAP34XX_SCRATCHPAD + 4));

	c = (reboot_mode >> 24) & 0xff;
	if (c != 'B')
		return -1;

	c = (reboot_mode >> 16) & 0xff;
	if (c != 'M')
		return -1;

	c = reboot_mode & 0xff;

	return c;
}

int omap_reboot_mode_clear(void)
{
	writel(0, (u32 *)(OMAP34XX_SCRATCHPAD + 4));

	return 0;
}

int omap_reboot_mode_store(char c)
{
	u32 reboot_mode;

	reboot_mode = 'B' << 24 | 'M' << 16 | c;

	writel(reboot_mode, (u32 *)(OMAP34XX_SCRATCHPAD + 4));

	return 0;
}