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path: root/drivers/firmware/psci.c
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Diffstat (limited to 'drivers/firmware/psci.c')
-rw-r--r--drivers/firmware/psci.c100
1 files changed, 84 insertions, 16 deletions
diff --git a/drivers/firmware/psci.c b/drivers/firmware/psci.c
index 2cb35f356f..c8c47acfd3 100644
--- a/drivers/firmware/psci.c
+++ b/drivers/firmware/psci.c
@@ -9,31 +9,38 @@
#include <common.h>
#include <dm.h>
#include <dm/lists.h>
+#include <efi_loader.h>
#include <linux/libfdt.h>
#include <linux/arm-smccc.h>
#include <linux/errno.h>
#include <linux/printk.h>
#include <linux/psci.h>
-psci_fn *invoke_psci_fn;
+#define DRIVER_NAME "psci"
-static unsigned long __invoke_psci_fn_hvc(unsigned long function_id,
- unsigned long arg0, unsigned long arg1,
- unsigned long arg2)
-{
- struct arm_smccc_res res;
+#define PSCI_METHOD_HVC 1
+#define PSCI_METHOD_SMC 2
- arm_smccc_hvc(function_id, arg0, arg1, arg2, 0, 0, 0, 0, &res);
- return res.a0;
-}
+int __efi_runtime_data psci_method;
-static unsigned long __invoke_psci_fn_smc(unsigned long function_id,
- unsigned long arg0, unsigned long arg1,
- unsigned long arg2)
+unsigned long __efi_runtime invoke_psci_fn
+ (unsigned long function_id, unsigned long arg0,
+ unsigned long arg1, unsigned long arg2)
{
struct arm_smccc_res res;
- arm_smccc_smc(function_id, arg0, arg1, arg2, 0, 0, 0, 0, &res);
+ /*
+ * In the __efi_runtime we need to avoid the switch statement. In some
+ * cases the compiler creates lookup tables to implement switch. These
+ * tables are not correctly relocated when SetVirtualAddressMap is
+ * called.
+ */
+ if (psci_method == PSCI_METHOD_SMC)
+ arm_smccc_smc(function_id, arg0, arg1, arg2, 0, 0, 0, 0, &res);
+ else if (psci_method == PSCI_METHOD_HVC)
+ arm_smccc_hvc(function_id, arg0, arg1, arg2, 0, 0, 0, 0, &res);
+ else
+ res.a0 = PSCI_RET_DISABLED;
return res.a0;
}
@@ -67,9 +74,9 @@ static int psci_probe(struct udevice *dev)
}
if (!strcmp("hvc", method)) {
- invoke_psci_fn = __invoke_psci_fn_hvc;
+ psci_method = PSCI_METHOD_HVC;
} else if (!strcmp("smc", method)) {
- invoke_psci_fn = __invoke_psci_fn_smc;
+ psci_method = PSCI_METHOD_SMC;
} else {
pr_warn("invalid \"method\" property: %s\n", method);
return -EINVAL;
@@ -78,6 +85,67 @@ static int psci_probe(struct udevice *dev)
return 0;
}
+/**
+ * void do_psci_probe() - probe PSCI firmware driver
+ *
+ * Ensure that psci_method is initialized.
+ */
+static void __maybe_unused do_psci_probe(void)
+{
+ struct udevice *dev;
+
+ uclass_get_device_by_name(UCLASS_FIRMWARE, DRIVER_NAME, &dev);
+}
+
+#if IS_ENABLED(CONFIG_EFI_LOADER) && IS_ENABLED(CONFIG_PSCI_RESET)
+efi_status_t efi_reset_system_init(void)
+{
+ do_psci_probe();
+ return EFI_SUCCESS;
+}
+
+void __efi_runtime EFIAPI efi_reset_system(enum efi_reset_type reset_type,
+ efi_status_t reset_status,
+ unsigned long data_size,
+ void *reset_data)
+{
+ if (reset_type == EFI_RESET_COLD ||
+ reset_type == EFI_RESET_WARM ||
+ reset_type == EFI_RESET_PLATFORM_SPECIFIC) {
+ invoke_psci_fn(PSCI_0_2_FN_SYSTEM_RESET, 0, 0, 0);
+ } else if (reset_type == EFI_RESET_SHUTDOWN) {
+ invoke_psci_fn(PSCI_0_2_FN_SYSTEM_OFF, 0, 0, 0);
+ }
+ while (1)
+ ;
+}
+#endif /* IS_ENABLED(CONFIG_EFI_LOADER) && IS_ENABLED(CONFIG_PSCI_RESET) */
+
+#ifdef CONFIG_PSCI_RESET
+void reset_misc(void)
+{
+ do_psci_probe();
+ invoke_psci_fn(PSCI_0_2_FN_SYSTEM_RESET, 0, 0, 0);
+}
+#endif /* CONFIG_PSCI_RESET */
+
+#ifdef CONFIG_CMD_POWEROFF
+int do_poweroff(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
+{
+ do_psci_probe();
+
+ puts("poweroff ...\n");
+ udelay(50000); /* wait 50 ms */
+
+ disable_interrupts();
+ invoke_psci_fn(PSCI_0_2_FN_SYSTEM_OFF, 0, 0, 0);
+ enable_interrupts();
+
+ log_err("Power off not supported on this platform\n");
+ return CMD_RET_FAILURE;
+}
+#endif
+
static const struct udevice_id psci_of_match[] = {
{ .compatible = "arm,psci" },
{ .compatible = "arm,psci-0.2" },
@@ -86,7 +154,7 @@ static const struct udevice_id psci_of_match[] = {
};
U_BOOT_DRIVER(psci) = {
- .name = "psci",
+ .name = DRIVER_NAME,
.id = UCLASS_FIRMWARE,
.of_match = psci_of_match,
.bind = psci_bind,