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Commit 498bb3da authored by Thierry Reding's avatar Thierry Reding Committed by Stephen Warren
Browse files

ARM: tegra: Support reboot modes 



The boot ROM on Tegra SoCs supports booting into forced recovery mode
(RCM) by setting a bit in the PMC scratch register 0. Similarily, the
Android bootloader examines some of the bits in this register to disable
autoboot or enter recovery mode.

Support these modes by setting the corresponding bits depending on the
specified reboot command (forced-recovery, bootloader, recovery). Recent
systemd-based distributions allow this to be specified using an optional
argument to the reboot command.

Signed-off-by: default avatarThierry Reding <treding@nvidia.com>
Tested-by: default avatarAlexandre Courbot <acourbot@nvidia.com>
Signed-off-by: default avatarStephen Warren <swarren@nvidia.com>
parent c9eaa447

arch/arm/mach-tegra/pmc.c

+24 −0
Original line number Diff line number Diff line
@@ -41,6 +41,14 @@ 
#define PMC_REMOVE_CLAMPING		0x34

#define PMC_PWRGATE_STATUS		0x38



#define PMC_SCRATCH0			0x50

#define PMC_SCRATCH0_MODE_RECOVERY	(1 << 31)

#define PMC_SCRATCH0_MODE_BOOTLOADER	(1 << 30)

#define PMC_SCRATCH0_MODE_RCM		(1 << 1)

#define PMC_SCRATCH0_MODE_MASK		(PMC_SCRATCH0_MODE_RECOVERY | \

					 PMC_SCRATCH0_MODE_BOOTLOADER | \

					 PMC_SCRATCH0_MODE_RCM)



#define PMC_CPUPWRGOOD_TIMER	0xc8

#define PMC_CPUPWROFF_TIMER	0xcc
@@ -165,6 +173,22 @@ void tegra_pmc_restart(enum reboot_mode mode, const char *cmd) 
{

	u32 val;



	val = tegra_pmc_readl(PMC_SCRATCH0);

	val &= ~PMC_SCRATCH0_MODE_MASK;



	if (cmd) {

		if (strcmp(cmd, "recovery") == 0)

			val |= PMC_SCRATCH0_MODE_RECOVERY;



		if (strcmp(cmd, "bootloader") == 0)

			val |= PMC_SCRATCH0_MODE_BOOTLOADER;



		if (strcmp(cmd, "forced-recovery") == 0)

			val |= PMC_SCRATCH0_MODE_RCM;

	}



	tegra_pmc_writel(val, PMC_SCRATCH0);



	val = tegra_pmc_readl(0);

	val |= 0x10;

	tegra_pmc_writel(val, 0);