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omap4: Reboot mode support

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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>
This commit is contained in:
Paul Kocialkowski 2016-02-27 19:19:07 +01:00 committed by Tom Rini
parent e66782e6ea
commit faec3f9841
2 changed files with 49 additions and 0 deletions
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41
arch/arm/cpu/armv7/omap4/boot.c
View file

@ -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;
}

8
arch/arm/include/asm/arch-omap4/omap.h
View file

@ -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