xref: /openbmc/u-boot/arch/arm/lib/psci-dt.c (revision b9553986)
1 // SPDX-License-Identifier: GPL-2.0+
2 /*
3  * Copyright 2016 NXP Semiconductor, Inc.
4  */
5 
6 #include <common.h>
7 #include <linux/libfdt.h>
8 #include <fdt_support.h>
9 #include <linux/sizes.h>
10 #include <linux/kernel.h>
11 #include <asm/psci.h>
12 #ifdef CONFIG_ARMV8_SEC_FIRMWARE_SUPPORT
13 #include <asm/armv8/sec_firmware.h>
14 #endif
15 
16 int fdt_psci(void *fdt)
17 {
18 #if defined(CONFIG_ARMV7_PSCI) || defined(CONFIG_ARMV8_PSCI) || \
19 	defined(CONFIG_SEC_FIRMWARE_ARMV8_PSCI)
20 	int nodeoff;
21 	unsigned int psci_ver = 0;
22 	int tmp;
23 
24 	nodeoff = fdt_path_offset(fdt, "/cpus");
25 	if (nodeoff < 0) {
26 		printf("couldn't find /cpus\n");
27 		return nodeoff;
28 	}
29 
30 	/* add 'enable-method = "psci"' to each cpu node */
31 	for (tmp = fdt_first_subnode(fdt, nodeoff);
32 	     tmp >= 0;
33 	     tmp = fdt_next_subnode(fdt, tmp)) {
34 		const struct fdt_property *prop;
35 		int len;
36 
37 		prop = fdt_get_property(fdt, tmp, "device_type", &len);
38 		if (!prop)
39 			continue;
40 		if (len < 4)
41 			continue;
42 		if (strcmp(prop->data, "cpu"))
43 			continue;
44 
45 		/*
46 		 * Not checking rv here, our approach is to skip over errors in
47 		 * individual cpu nodes, hopefully some of the nodes are
48 		 * processed correctly and those will boot
49 		 */
50 		fdt_setprop_string(fdt, tmp, "enable-method", "psci");
51 	}
52 
53 	nodeoff = fdt_path_offset(fdt, "/psci");
54 	if (nodeoff >= 0)
55 		goto init_psci_node;
56 
57 	nodeoff = fdt_path_offset(fdt, "/");
58 	if (nodeoff < 0)
59 		return nodeoff;
60 
61 	nodeoff = fdt_add_subnode(fdt, nodeoff, "psci");
62 	if (nodeoff < 0)
63 		return nodeoff;
64 
65 init_psci_node:
66 #ifdef CONFIG_ARMV8_SEC_FIRMWARE_SUPPORT
67 	psci_ver = sec_firmware_support_psci_version();
68 #elif defined(CONFIG_ARMV7_PSCI_1_0) || defined(CONFIG_ARMV8_PSCI)
69 	psci_ver = ARM_PSCI_VER_1_0;
70 #elif defined(CONFIG_ARMV7_PSCI_0_2)
71 	psci_ver = ARM_PSCI_VER_0_2;
72 #endif
73 	if (psci_ver >= ARM_PSCI_VER_1_0) {
74 		tmp = fdt_setprop_string(fdt, nodeoff,
75 				"compatible", "arm,psci-1.0");
76 		if (tmp)
77 			return tmp;
78 	}
79 
80 	if (psci_ver >= ARM_PSCI_VER_0_2) {
81 		tmp = fdt_appendprop_string(fdt, nodeoff,
82 				"compatible", "arm,psci-0.2");
83 		if (tmp)
84 			return tmp;
85 	}
86 
87 #ifndef CONFIG_ARMV8_SEC_FIRMWARE_SUPPORT
88 	/*
89 	 * The Secure firmware framework isn't able to support PSCI version 0.1.
90 	 */
91 	if (psci_ver < ARM_PSCI_VER_0_2) {
92 		tmp = fdt_appendprop_string(fdt, nodeoff,
93 				"compatible", "arm,psci");
94 		if (tmp)
95 			return tmp;
96 		tmp = fdt_setprop_u32(fdt, nodeoff, "cpu_suspend",
97 				ARM_PSCI_FN_CPU_SUSPEND);
98 		if (tmp)
99 			return tmp;
100 		tmp = fdt_setprop_u32(fdt, nodeoff, "cpu_off",
101 				ARM_PSCI_FN_CPU_OFF);
102 		if (tmp)
103 			return tmp;
104 		tmp = fdt_setprop_u32(fdt, nodeoff, "cpu_on",
105 				ARM_PSCI_FN_CPU_ON);
106 		if (tmp)
107 			return tmp;
108 		tmp = fdt_setprop_u32(fdt, nodeoff, "migrate",
109 				ARM_PSCI_FN_MIGRATE);
110 		if (tmp)
111 			return tmp;
112 	}
113 #endif
114 
115 	tmp = fdt_setprop_string(fdt, nodeoff, "method", "smc");
116 	if (tmp)
117 		return tmp;
118 
119 	tmp = fdt_setprop_string(fdt, nodeoff, "status", "okay");
120 	if (tmp)
121 		return tmp;
122 
123 #endif
124 	return 0;
125 }
126