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

2026-09-06 03:52:57 +08:00
commit b1928b41c0
21813 changed files with 4413081 additions and 0 deletions
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+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Copyright 2016 NXP Semiconductor, Inc.
+ */
+
+#include <common.h>
+#include <linux/libfdt.h>
+#include <fdt_support.h>
+#include <linux/sizes.h>
+#include <linux/kernel.h>
+#include <asm/psci.h>
+#ifdef CONFIG_ARMV8_SEC_FIRMWARE_SUPPORT
+#include <asm/armv8/sec_firmware.h>
+#endif
+
+int fdt_psci(void *fdt)
+{
+#if defined(CONFIG_ARMV7_PSCI) || defined(CONFIG_ARMV8_PSCI) || \
+	defined(CONFIG_SEC_FIRMWARE_ARMV8_PSCI)
+	int nodeoff;
+	unsigned int psci_ver = 0;
+	int tmp;
+
+	nodeoff = fdt_path_offset(fdt, "/cpus");
+	if (nodeoff < 0) {
+		printf("couldn't find /cpus\n");
+		return nodeoff;
+	}
+
+	/* add 'enable-method = "psci"' to each cpu node */
+	for (tmp = fdt_first_subnode(fdt, nodeoff);
+	     tmp >= 0;
+	     tmp = fdt_next_subnode(fdt, tmp)) {
+		const struct fdt_property *prop;
+		int len;
+
+		prop = fdt_get_property(fdt, tmp, "device_type", &len);
+		if (!prop)
+			continue;
+		if (len < 4)
+			continue;
+		if (strcmp(prop->data, "cpu"))
+			continue;
+
+		/*
+		 * Not checking rv here, our approach is to skip over errors in
+		 * individual cpu nodes, hopefully some of the nodes are
+		 * processed correctly and those will boot
+		 */
+		fdt_setprop_string(fdt, tmp, "enable-method", "psci");
+	}
+
+	nodeoff = fdt_path_offset(fdt, "/psci");
+	if (nodeoff >= 0)
+		goto init_psci_node;
+
+	nodeoff = fdt_path_offset(fdt, "/");
+	if (nodeoff < 0)
+		return nodeoff;
+
+	nodeoff = fdt_add_subnode(fdt, nodeoff, "psci");
+	if (nodeoff < 0)
+		return nodeoff;
+
+init_psci_node:
+#ifdef CONFIG_ARMV8_SEC_FIRMWARE_SUPPORT
+	psci_ver = sec_firmware_support_psci_version();
+#elif defined(CONFIG_ARMV7_PSCI_1_0) || defined(CONFIG_ARMV8_PSCI)
+	psci_ver = ARM_PSCI_VER_1_0;
+#elif defined(CONFIG_ARMV7_PSCI_0_2)
+	psci_ver = ARM_PSCI_VER_0_2;
+#endif
+	if (psci_ver >= ARM_PSCI_VER_1_0) {
+		tmp = fdt_setprop_string(fdt, nodeoff,
+				"compatible", "arm,psci-1.0");
+		if (tmp)
+			return tmp;
+	}
+
+	if (psci_ver >= ARM_PSCI_VER_0_2) {
+		tmp = fdt_appendprop_string(fdt, nodeoff,
+				"compatible", "arm,psci-0.2");
+		if (tmp)
+			return tmp;
+	}
+
+#ifndef CONFIG_ARMV8_SEC_FIRMWARE_SUPPORT
+	/*
+	 * The Secure firmware framework isn't able to support PSCI version 0.1.
+	 */
+	if (psci_ver < ARM_PSCI_VER_0_2) {
+		tmp = fdt_appendprop_string(fdt, nodeoff,
+				"compatible", "arm,psci");
+		if (tmp)
+			return tmp;
+		tmp = fdt_setprop_u32(fdt, nodeoff, "cpu_suspend",
+				ARM_PSCI_FN_CPU_SUSPEND);
+		if (tmp)
+			return tmp;
+		tmp = fdt_setprop_u32(fdt, nodeoff, "cpu_off",
+				ARM_PSCI_FN_CPU_OFF);
+		if (tmp)
+			return tmp;
+		tmp = fdt_setprop_u32(fdt, nodeoff, "cpu_on",
+				ARM_PSCI_FN_CPU_ON);
+		if (tmp)
+			return tmp;
+		tmp = fdt_setprop_u32(fdt, nodeoff, "migrate",
+				ARM_PSCI_FN_MIGRATE);
+		if (tmp)
+			return tmp;
+	}
+#endif
+
+	tmp = fdt_setprop_string(fdt, nodeoff, "method", "smc");
+	if (tmp)
+		return tmp;
+
+	tmp = fdt_setprop_string(fdt, nodeoff, "status", "okay");
+	if (tmp)
+		return tmp;
+
+#endif
+	return 0;
+}