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authorClément Léger <clement.leger@bootlin.com>2022-05-02 18:22:19 +0300
committerClaudiu Beznea <claudiu.beznea@microchip.com>2022-05-12 14:50:50 +0300
commitf2f5cf78a3336f0245a1a59e641ce98fa9503db8 (patch)
tree166af49a18459052bc70ce86a7bf1e74da7c65b0 /arch/arm/mach-at91
parent0c9fd821175a5634e00aa391f5f202f8ed4c9223 (diff)
downloadlinux-f2f5cf78a3336f0245a1a59e641ce98fa9503db8.tar.xz
ARM: at91: pm: add support for sama5d2 secure suspend
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>
Diffstat (limited to 'arch/arm/mach-at91')
-rw-r--r--arch/arm/mach-at91/Kconfig11
-rw-r--r--arch/arm/mach-at91/pm.c36
-rw-r--r--arch/arm/mach-at91/sam_secure.h4
3 files changed, 50 insertions, 1 deletions
diff --git a/arch/arm/mach-at91/Kconfig b/arch/arm/mach-at91/Kconfig
index 1531b4625c76..0edb60f7ccc6 100644
--- a/arch/arm/mach-at91/Kconfig
+++ b/arch/arm/mach-at91/Kconfig
@@ -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
diff --git a/arch/arm/mach-at91/pm.c b/arch/arm/mach-at91/pm.c
index 7b2617000845..b1a43d7bc56c 100644
--- a/arch/arm/mach-at91/pm.c
+++ b/arch/arm/mach-at91/pm.c
@@ -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);
diff --git a/arch/arm/mach-at91/sam_secure.h b/arch/arm/mach-at91/sam_secure.h
index 360036672f52..1e7d8b20ba1e 100644
--- a/arch/arm/mach-at91/sam_secure.h
+++ b/arch/arm/mach-at91/sam_secure.h
@@ -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);