1 /* 2 * Copyright (c) 2016, ARM Limited and Contributors. All rights reserved. 3 * 4 * SPDX-License-Identifier: BSD-3-Clause 5 */ 6 #include <console.h> 7 #include <debug.h> 8 #include <libfdt.h> 9 #include <psci.h> 10 #include <string.h> 11 #include "qemu_private.h" 12 13 static int append_psci_compatible(void *fdt, int offs, const char *str) 14 { 15 return fdt_appendprop(fdt, offs, "compatible", str, strlen(str) + 1); 16 } 17 18 int dt_add_psci_node(void *fdt) 19 { 20 int offs; 21 22 if (fdt_path_offset(fdt, "/psci") >= 0) { 23 WARN("PSCI Device Tree node already exists!\n"); 24 return 0; 25 } 26 27 offs = fdt_path_offset(fdt, "/"); 28 if (offs < 0) 29 return -1; 30 offs = fdt_add_subnode(fdt, offs, "psci"); 31 if (offs < 0) 32 return -1; 33 if (append_psci_compatible(fdt, offs, "arm,psci-1.0")) 34 return -1; 35 if (append_psci_compatible(fdt, offs, "arm,psci-0.2")) 36 return -1; 37 if (append_psci_compatible(fdt, offs, "arm,psci")) 38 return -1; 39 if (fdt_setprop_string(fdt, offs, "method", "smc")) 40 return -1; 41 if (fdt_setprop_u32(fdt, offs, "cpu_suspend", PSCI_CPU_SUSPEND_AARCH64)) 42 return -1; 43 if (fdt_setprop_u32(fdt, offs, "cpu_off", PSCI_CPU_OFF)) 44 return -1; 45 if (fdt_setprop_u32(fdt, offs, "cpu_on", PSCI_CPU_ON_AARCH64)) 46 return -1; 47 if (fdt_setprop_u32(fdt, offs, "sys_poweroff", PSCI_SYSTEM_OFF)) 48 return -1; 49 if (fdt_setprop_u32(fdt, offs, "sys_reset", PSCI_SYSTEM_RESET)) 50 return -1; 51 return 0; 52 } 53 54 static int check_node_compat_prefix(void *fdt, int offs, const char *prefix) 55 { 56 const size_t prefix_len = strlen(prefix); 57 size_t l; 58 int plen; 59 const char *prop; 60 61 prop = fdt_getprop(fdt, offs, "compatible", &plen); 62 if (!prop) 63 return -1; 64 65 while (plen > 0) { 66 if (memcmp(prop, prefix, prefix_len) == 0) 67 return 0; /* match */ 68 69 l = strlen(prop) + 1; 70 prop += l; 71 plen -= l; 72 } 73 74 return -1; 75 } 76 77 int dt_add_psci_cpu_enable_methods(void *fdt) 78 { 79 int offs = 0; 80 81 while (1) { 82 offs = fdt_next_node(fdt, offs, NULL); 83 if (offs < 0) 84 break; 85 if (fdt_getprop(fdt, offs, "enable-method", NULL)) 86 continue; /* already set */ 87 if (check_node_compat_prefix(fdt, offs, "arm,cortex-a")) 88 continue; /* no compatible */ 89 if (fdt_setprop_string(fdt, offs, "enable-method", "psci")) 90 return -1; 91 /* Need to restart scanning as offsets may have changed */ 92 offs = 0; 93 } 94 return 0; 95 } 96
