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omap3: Reboot mode support

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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 <contact@paulk.fr>
Reviewed-by: Tom Rini <trini@konsulko.com>
This commit is contained in:
Paul Kocialkowski 2015-07-20 15:17:10 +02:00 committed by Tom Rini
parent a4c8bbbc28
commit a08af85f46
2 changed files with 45 additions and 0 deletions
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38
arch/arm/cpu/armv7/omap3/boot.c
View File

@ -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;
}

7
arch/arm/include/asm/arch-omap3/omap.h
View File

@ -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