GK SDK 源码库: XMIPCLinuxV100R005C00SPC030 (kernel/tools/open_source excluded)

source/bootloader/u-boot-2020.01/drivers/firmware/psci.c

@@ -0,0 +1,163 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Copyright (C) 2017 Masahiro Yamada <yamada.masahiro@socionext.com>
+ *
+ * Based on drivers/firmware/psci.c from Linux:
+ * Copyright (C) 2015 ARM Limited
+ */
+
+#include <common.h>
+#include <dm.h>
+#include <irq_func.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>
+
+#define DRIVER_NAME "psci"
+
+#define PSCI_METHOD_HVC 1
+#define PSCI_METHOD_SMC 2
+
+int __efi_runtime_data psci_method;
+
+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;
+
+	/*
+	 * 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;
+}
+
+static int psci_bind(struct udevice *dev)
+{
+	/* No SYSTEM_RESET support for PSCI 0.1 */
+	if (device_is_compatible(dev, "arm,psci-0.2") ||
+	    device_is_compatible(dev, "arm,psci-1.0")) {
+		int ret;
+
+		/* bind psci-sysreset optionally */
+		ret = device_bind_driver(dev, "psci-sysreset", "psci-sysreset",
+					 NULL);
+		if (ret)
+			pr_debug("PSCI System Reset was not bound.\n");
+	}
+
+	return 0;
+}
+
+static int psci_probe(struct udevice *dev)
+{
+	DECLARE_GLOBAL_DATA_PTR;
+	const char *method;
+
+	method = fdt_stringlist_get(gd->fdt_blob, dev_of_offset(dev), "method",
+				    0, NULL);
+	if (!method) {
+		pr_warn("missing \"method\" property\n");
+		return -ENXIO;
+	}
+
+	if (!strcmp("hvc", method)) {
+		psci_method = PSCI_METHOD_HVC;
+	} else if (!strcmp("smc", method)) {
+		psci_method = PSCI_METHOD_SMC;
+	} else {
+		pr_warn("invalid \"method\" property: %s\n", method);
+		return -EINVAL;
+	}
+
+	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" },
+	{ .compatible = "arm,psci-1.0" },
+	{},
+};
+
+U_BOOT_DRIVER(psci) = {
+	.name = DRIVER_NAME,
+	.id = UCLASS_FIRMWARE,
+	.of_match = psci_of_match,
+	.bind = psci_bind,
+	.probe = psci_probe,
+};