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| author | Paul Kocialkowski <contact@paulk.fr> | 2016-02-27 19:19:07 +0100 |
|---|---|---|
| committer | Tom Rini <trini@konsulko.com> | 2016-03-15 15:12:53 -0400 |
| commit | faec3f984120f1bee3f193c339f15c451b6d26e1 (patch) | |
| tree | 1086bbfed5318b64d080812fe091acb017de677f /arch | |
| parent | e66782e6eae2b918bffd56d7146895f8ad1c00dc (diff) | |
| download | u-boot-imx-faec3f984120f1bee3f193c339f15c451b6d26e1.zip u-boot-imx-faec3f984120f1bee3f193c339f15c451b6d26e1.tar.gz u-boot-imx-faec3f984120f1bee3f193c339f15c451b6d26e1.tar.bz2 | |
omap4: Reboot mode support
Reboot mode is written to SAR memory before reboot in the form of a string.
This mechanism is supported on OMAP4 by various TI kernels.
It is up to each board to make use of this mechanism or not.
Signed-off-by: Paul Kocialkowski <contact@paulk.fr>
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/arm/cpu/armv7/omap4/boot.c | 41 | ||||
| -rw-r--r-- | arch/arm/include/asm/arch-omap4/omap.h | 8 |
2 files changed, 49 insertions, 0 deletions
diff --git a/arch/arm/cpu/armv7/omap4/boot.c b/arch/arm/cpu/armv7/omap4/boot.c index 4b5aa77..bae49f4 100644 --- a/arch/arm/cpu/armv7/omap4/boot.c +++ b/arch/arm/cpu/armv7/omap4/boot.c @@ -58,3 +58,44 @@ u32 omap_sys_boot_device(void) return boot_devices[sys_boot]; } + +int omap_reboot_mode(char *mode, unsigned int length) +{ + unsigned int limit; + unsigned int i; + + if (length < 2) + return -1; + + limit = (length < OMAP_REBOOT_REASON_SIZE) ? length : + OMAP_REBOOT_REASON_SIZE; + + for (i = 0; i < (limit - 1); i++) + mode[i] = readb((u8 *)(OMAP44XX_SAR_RAM_BASE + + OMAP_REBOOT_REASON_OFFSET + i)); + + mode[i] = '\0'; + + return 0; +} + +int omap_reboot_mode_clear(void) +{ + writeb(0, (u8 *)(OMAP44XX_SAR_RAM_BASE + OMAP_REBOOT_REASON_OFFSET)); + + return 0; +} + +int omap_reboot_mode_store(char *mode) +{ + unsigned int i; + + for (i = 0; i < (OMAP_REBOOT_REASON_SIZE - 1) && mode[i] != '\0'; i++) + writeb(mode[i], (u8 *)(OMAP44XX_SAR_RAM_BASE + + OMAP_REBOOT_REASON_OFFSET + i)); + + writeb('\0', (u8 *)(OMAP44XX_SAR_RAM_BASE + + OMAP_REBOOT_REASON_OFFSET + i)); + + return 0; +} diff --git a/arch/arm/include/asm/arch-omap4/omap.h b/arch/arm/include/asm/arch-omap4/omap.h index 4712722..5ccda6e 100644 --- a/arch/arm/include/asm/arch-omap4/omap.h +++ b/arch/arm/include/asm/arch-omap4/omap.h @@ -120,6 +120,10 @@ struct s32ktimer { /* ABB tranxdone mask */ #define OMAP_ABB_MPU_TXDONE_MASK (0x1 << 7) +#define OMAP44XX_SAR_RAM_BASE 0x4a326000 +#define OMAP_REBOOT_REASON_OFFSET 0xA0C +#define OMAP_REBOOT_REASON_SIZE 0x0F + /* Boot parameters */ #ifndef __ASSEMBLY__ struct omap_boot_parameters { @@ -129,6 +133,10 @@ struct omap_boot_parameters { unsigned char reset_reason; unsigned char ch_flags; }; + +int omap_reboot_mode(char *mode, unsigned int length); +int omap_reboot_mode_clear(void); +int omap_reboot_mode_store(char *mode); #endif #endif |