ARMv8/PSCI: Fixup the device tree for PSCI
Set the enable-method in the cpu node to PSCI, and create device
node for PSCI, when PSCI was enabled.
Signed-off-by: Hou Zhiqiang <Zhiqiang.Hou@nxp.com>
Reviewed-by: York Sun <york.sun@nxp.com>
diff --git a/arch/arm/lib/psci-dt.c b/arch/arm/lib/psci-dt.c
new file mode 100644
index 0000000..8dc31d4
--- /dev/null
+++ b/arch/arm/lib/psci-dt.c
@@ -0,0 +1,123 @@
+/*
+ * Copyright 2016 NXP Semiconductor, Inc.
+ *
+ * SPDX-License-Identifier: GPL-2.0+
+ */
+
+#include <common.h>
+#include <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_ARMV8_PSCI) || defined(CONFIG_ARMV7_PSCI)
+ int nodeoff;
+ unsigned int psci_ver = 0;
+ char *psci_compt;
+ 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");
+ }
+
+ /*
+ * The PSCI node might be called "/psci" or might be called something
+ * else but contain either of the compatible strings
+ * "arm,psci"/"arm,psci-0.2"
+ */
+ nodeoff = fdt_path_offset(fdt, "/psci");
+ if (nodeoff >= 0)
+ goto init_psci_node;
+
+ nodeoff = fdt_node_offset_by_compatible(fdt, -1, "arm,psci");
+ if (nodeoff >= 0)
+ goto init_psci_node;
+
+ nodeoff = fdt_node_offset_by_compatible(fdt, -1, "arm,psci-0.2");
+ if (nodeoff >= 0)
+ goto init_psci_node;
+
+ nodeoff = fdt_node_offset_by_compatible(fdt, -1, "arm,psci-1.0");
+ 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();
+#endif
+ switch (psci_ver) {
+ case 0x00010000:
+ psci_compt = "arm,psci-1.0";
+ break;
+ case 0x00000002:
+ psci_compt = "arm,psci-0.2";
+ break;
+ default:
+ psci_compt = "arm,psci";
+ break;
+ }
+
+ tmp = fdt_setprop_string(fdt, nodeoff, "compatible", psci_compt);
+ if (tmp)
+ return tmp;
+ tmp = fdt_setprop_string(fdt, nodeoff, "method", "smc");
+ if (tmp)
+ return tmp;
+
+#ifdef CONFIG_ARMV7_PSCI
+ 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
+#endif
+ return 0;
+}