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ARM: at91: pm: add support for sama5d2 secure suspend

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When running with OP-TEE, the suspend control is handled securely.
Suspend can be entered using PSCI support. Since the sama5d2 supports
multiple suspend modes, add a new CONFIG_ATMEL_SECURE_PM which will
send a SMC call to select the suspend mode at init time.

"atmel.pm_modes" boot argument is still supported for compatibility
purposes but the standby value is actually ignored since PSCI suspend
is used and it only support one mode (suspend).

Signed-off-by: Clément Léger <clement.leger@bootlin.com>
Signed-off-by: Claudiu Beznea <claudiu.beznea@microchip.com>
Signed-off-by: Nicolas Ferre <nicolas.ferre@microchip.com>
This commit is contained in:
Clément Léger 2022-05-02 17:22:19 +02:00 committed by Claudiu Beznea
parent 0c9fd82117
commit f2f5cf78a3
3 changed files with 50 additions and 1 deletions
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11
arch/arm/mach-at91/Kconfig
View File

@ -218,7 +218,16 @@ config SOC_SAMA5
select SRAM if PM
config ATMEL_PM
bool
bool "Atmel PM support"
config ATMEL_SECURE_PM
bool "Atmel Secure PM support"
depends on SOC_SAMA5D2 && ATMEL_PM
select ARM_PSCI
help
When running under a TEE, the suspend mode must be requested to be set
at TEE level. When enable, this option will use secure monitor calls
to set the suspend level. PSCI is then used to enter suspend.
config SOC_SAMA7
bool

36
arch/arm/mach-at91/pm.c
View File

@ -28,6 +28,7 @@
#include "generic.h"
#include "pm.h"
#include "sam_secure.h"
#define BACKUP_DDR_PHY_CALIBRATION (9)
@ -1078,6 +1079,35 @@ securam_fail:
return ret;
}
static void at91_pm_secure_init(void)
{
int suspend_mode;
struct arm_smccc_res res;
suspend_mode = soc_pm.data.suspend_mode;
res = sam_smccc_call(SAMA5_SMC_SIP_SET_SUSPEND_MODE,
suspend_mode, 0);
if (res.a0 == 0) {
pr_info("AT91: Secure PM: suspend mode set to %s\n",
pm_modes[suspend_mode].pattern);
return;
}
pr_warn("AT91: Secure PM: %s mode not supported !\n",
pm_modes[suspend_mode].pattern);
res = sam_smccc_call(SAMA5_SMC_SIP_GET_SUSPEND_MODE, 0, 0);
if (res.a0 == 0) {
pr_warn("AT91: Secure PM: failed to get default mode\n");
return;
}
pr_info("AT91: Secure PM: using default suspend mode %s\n",
pm_modes[suspend_mode].pattern);
soc_pm.data.suspend_mode = res.a1;
}
static const struct of_device_id atmel_shdwc_ids[] = {
{ .compatible = "atmel,sama5d2-shdwc" },
{ .compatible = "microchip,sam9x60-shdwc" },
@ -1526,6 +1556,12 @@ void __init sama5d2_pm_init(void)
if (!IS_ENABLED(CONFIG_SOC_SAMA5D2))
return;
if (IS_ENABLED(CONFIG_ATMEL_SECURE_PM)) {
pr_warn("AT91: Secure PM: ignoring standby mode\n");
at91_pm_secure_init();
return;
}
at91_pm_modes_validate(modes, ARRAY_SIZE(modes));
at91_pm_modes_init(iomaps, ARRAY_SIZE(iomaps));
ret = at91_dt_ramc(false);

4
arch/arm/mach-at91/sam_secure.h
View File

@ -8,6 +8,10 @@
#include <linux/arm-smccc.h>
/* Secure Monitor mode APIs */
#define SAMA5_SMC_SIP_SET_SUSPEND_MODE 0x400
#define SAMA5_SMC_SIP_GET_SUSPEND_MODE 0x401
void __init sam_secure_init(void);
struct arm_smccc_res sam_smccc_call(u32 fn, u32 arg0, u32 arg1);