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arch/arm: meson: sm: introduce power domain functions

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This commit adds functions to manage secure power domain for
Amlogic SoC's using smc functionality.

Signed-off-by: Alexey Romanov <avromanov@sberdevices.ru>
Reviewed-by: Neil Armstrong <neil.armstrong@linaro.org>
Link: https://lore.kernel.org/r/20230531093156.29240-2-avromanov@sberdevices.ru
Signed-off-by: Neil Armstrong <neil.armstrong@linaro.org>
This commit is contained in:
Alexey Romanov 2023-05-31 12:31:54 +03:00 committed by Neil Armstrong
parent 1444acbd03
commit eb0a01e603
2 changed files with 44 additions and 0 deletions
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30
arch/arm/include/asm/arch-meson/sm.h
View File

@ -58,4 +58,34 @@ enum {
*/
int meson_sm_get_reboot_reason(void);
#define PWRDM_OFF 0
#define PWRDM_ON 1
/**
* meson_sm_pwrdm_set - do command at specified power domain.
*
* @index: power domain index.
* @cmd: command index.
* @return: zero on success or error code on failure.
*/
int meson_sm_pwrdm_set(size_t index, int cmd);
/**
* meson_sm_pwrdm_off - disable specified power domain.
*
* @index: power domain index.
* @return: zero on success or error code on failure.
*/
#define meson_sm_pwrdm_off(index) \
meson_sm_pwrdm_set(index, PWRDM_OFF)
/**
* meson_sm_pwrdm_on - enable specified power domain.
*
* @index: power domain index.
* @return: zero on success or error code on failure.
*/
#define meson_sm_pwrdm_on(index) \
meson_sm_pwrdm_set(index, PWRDM_ON)
#endif /* __MESON_SM_H__ */

14
arch/arm/mach-meson/sm.c
View File

@ -24,6 +24,7 @@
#define FN_EFUSE_READ 0x82000030
#define FN_EFUSE_WRITE 0x82000031
#define FN_CHIP_ID 0x82000044
#define FN_PWRDM_SET 0x82000093
static void *shmem_input;
static void *shmem_output;
@ -137,3 +138,16 @@ int meson_sm_get_reboot_reason(void)
/* The SMC call is not used, we directly use AO_SEC_SD_CFG15 */
return FIELD_GET(REBOOT_REASON_MASK, reason);
}
int meson_sm_pwrdm_set(size_t index, int cmd)
{
struct pt_regs regs;
regs.regs[0] = FN_PWRDM_SET;
regs.regs[1] = index;
regs.regs[2] = cmd;
smc_call(&regs);
return regs.regs[0];
}