From a08af85f46a52dd5046ef690f0ef40261322eefb Mon Sep 17 00:00:00 2001 From: Paul Kocialkowski Date: Mon, 20 Jul 2015 15:17:10 +0200 Subject: [PATCH] omap3: Reboot mode support Reboot mode is written in scratchpad memory before reboot in the form of a single char, that is the first letter of the reboot mode string as passed to the reboot function. This mechanism is supported on OMAP3 both my the upstream kernel and by various TI kernels. It is up to each board to make use of this mechanism or not. Signed-off-by: Paul Kocialkowski Reviewed-by: Tom Rini --- arch/arm/cpu/armv7/omap3/boot.c | 38 ++++++++++++++++++++++++++ arch/arm/include/asm/arch-omap3/omap.h | 7 +++++ 2 files changed, 45 insertions(+) diff --git a/arch/arm/cpu/armv7/omap3/boot.c b/arch/arm/cpu/armv7/omap3/boot.c index 66576b26c5..44d7c30662 100644 --- a/arch/arm/cpu/armv7/omap3/boot.c +++ b/arch/arm/cpu/armv7/omap3/boot.c @@ -56,3 +56,41 @@ u32 omap_sys_boot_device(void) 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; +} diff --git a/arch/arm/include/asm/arch-omap3/omap.h b/arch/arm/include/asm/arch-omap3/omap.h index 537d13b263..2c94a814ef 100644 --- a/arch/arm/include/asm/arch-omap3/omap.h +++ b/arch/arm/include/asm/arch-omap3/omap.h @@ -51,6 +51,9 @@ struct control_prog_io { /* Bit definition for CONTROL_PROG_IO1 */ #define PRG_I2C2_PULLUPRESX 0x00000001 +/* Scratchpad memory */ +#define OMAP34XX_SCRATCHPAD (OMAP34XX_CTRL_BASE + 0x910) + /* UART */ #define OMAP34XX_UART1 (OMAP34XX_L4_IO_BASE + 0x6a000) #define OMAP34XX_UART2 (OMAP34XX_L4_IO_BASE + 0x6c000) @@ -256,6 +259,10 @@ struct omap_boot_parameters { unsigned char ch_flags; unsigned int boot_device_descriptor; }; + +char omap_reboot_mode(void); +int omap_reboot_mode_clear(void); +int omap_reboot_mode_store(char c); #endif #endif -- 2.25.1