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authorOlof Johansson <olof@lixom.net>2014-05-21 15:04:52 -0700
committerOlof Johansson <olof@lixom.net>2014-05-21 15:04:52 -0700
commit9706c077d8f786268b2c48c368547c3bd8262bfb (patch)
tree981b80c4240fb8a48f47e5a5b24f3b91025ae7ef /arch/arm/mach-tegra
parent0b3534be6580b8b72997e5c37a921103b8885cc1 (diff)
parent498bb3da7e04ed82d9b66106c4baeb3000a7100e (diff)
Merge tag 'tegra-for-3.16-soc' of git://git.kernel.org/pub/scm/linux/kernel/git/tegra/linux into next/soc
Merge "ARM: tegra: core code changes for 3.16" from Stephen Warren: This branch contains just a single patch this time around. Thierry enhanced Tegra's restart code to allow programming PMC scratch registers to request specific behaviour after reboot. One of the most useful options for mainline software is the ability to reboot directly into USB recovery mode, which e.g. allows the bootloader to be reflashed. * tag 'tegra-for-3.16-soc' of git://git.kernel.org/pub/scm/linux/kernel/git/tegra/linux: ARM: tegra: Support reboot modes Signed-off-by: Olof Johansson <olof@lixom.net>
Diffstat (limited to 'arch/arm/mach-tegra')
-rw-r--r--arch/arm/mach-tegra/pmc.c24
1 files changed, 24 insertions, 0 deletions
diff --git a/arch/arm/mach-tegra/pmc.c b/arch/arm/mach-tegra/pmc.c
index fb7920201ab4..7c7123e7557b 100644
--- a/arch/arm/mach-tegra/pmc.c
+++ b/arch/arm/mach-tegra/pmc.c
@@ -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);