psci: add features/reset2 support
Adds support for:
* PSCI_FEATURES, which was introduced in PSCI 1.0. This provides API
that allows discovering whether a specific PSCI function is implemented
and its features.
* SYSTEM_RESET2, which was introduced in PSCI 1.1, which extends existing
SYSTEM_RESET. It provides support for vendor-specific resets, providing
reset_type as an additional param.
For additional details visit [1].
Implementations of some functions were borrowed from Linux PSCI driver
code [2].
[1] https://developer.arm.com/documentation/den0022/latest/
[2] drivers/firmware/psci/psci.c
Signed-off-by: Igor Opaniuk <igor.opaniuk@foundries.io>
diff --git a/drivers/firmware/psci.c b/drivers/firmware/psci.c
index 68953cc..be57552 100644
--- a/drivers/firmware/psci.c
+++ b/drivers/firmware/psci.c
@@ -13,6 +13,7 @@
#include <log.h>
#include <dm/lists.h>
#include <efi_loader.h>
+#include <sysreset.h>
#include <linux/delay.h>
#include <linux/libfdt.h>
#include <linux/arm-smccc.h>
@@ -26,6 +27,18 @@
#define PSCI_METHOD_HVC 1
#define PSCI_METHOD_SMC 2
+/*
+ * While a 64-bit OS can make calls with SMC32 calling conventions, for some
+ * calls it is necessary to use SMC64 to pass or return 64-bit values.
+ * For such calls PSCI_FN_NATIVE(version, name) will choose the appropriate
+ * (native-width) function ID.
+ */
+#if defined(CONFIG_ARM64)
+#define PSCI_FN_NATIVE(version, name) PSCI_##version##_FN64_##name
+#else
+#define PSCI_FN_NATIVE(version, name) PSCI_##version##_FN_##name
+#endif
+
#if CONFIG_IS_ENABLED(EFI_LOADER)
int __efi_runtime_data psci_method;
#else
@@ -53,6 +66,34 @@
return res.a0;
}
+static int psci_features(u32 psci_func_id)
+{
+ return invoke_psci_fn(PSCI_1_0_FN_PSCI_FEATURES,
+ psci_func_id, 0, 0);
+}
+
+static u32 psci_0_2_get_version(void)
+{
+ return invoke_psci_fn(PSCI_0_2_FN_PSCI_VERSION, 0, 0, 0);
+}
+
+static bool psci_is_system_reset2_supported(void)
+{
+ int ret;
+ u32 ver;
+
+ ver = psci_0_2_get_version();
+
+ if (PSCI_VERSION_MAJOR(ver) >= 1) {
+ ret = psci_features(PSCI_FN_NATIVE(1_1, SYSTEM_RESET2));
+
+ if (ret != PSCI_RET_NOT_SUPPORTED)
+ return true;
+ }
+
+ return false;
+}
+
static int psci_bind(struct udevice *dev)
{
/* No SYSTEM_RESET support for PSCI 0.1 */
@@ -141,6 +182,33 @@
}
#endif /* CONFIG_PSCI_RESET */
+void psci_sys_reset(u32 type)
+{
+ bool reset2_supported;
+
+ do_psci_probe();
+
+ reset2_supported = psci_is_system_reset2_supported();
+
+ if (type == SYSRESET_WARM && reset2_supported) {
+ /*
+ * reset_type[31] = 0 (architectural)
+ * reset_type[30:0] = 0 (SYSTEM_WARM_RESET)
+ * cookie = 0 (ignored by the implementation)
+ */
+ invoke_psci_fn(PSCI_FN_NATIVE(1_1, SYSTEM_RESET2), 0, 0, 0);
+ } else {
+ invoke_psci_fn(PSCI_0_2_FN_SYSTEM_RESET, 0, 0, 0);
+ }
+}
+
+void psci_sys_poweroff(void)
+{
+ do_psci_probe();
+
+ invoke_psci_fn(PSCI_0_2_FN_SYSTEM_OFF, 0, 0, 0);
+}
+
#ifdef CONFIG_CMD_POWEROFF
int do_poweroff(struct cmd_tbl *cmdtp, int flag, int argc, char *const argv[])
{