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