1 /* $NetBSD: psci_fdt.c,v 1.17 2018/09/09 21:16:05 jmcneill Exp $ */ 2 3 /*- 4 * Copyright (c) 2017 Jared McNeill <jmcneill@invisible.ca> 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 17 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 18 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 19 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 20 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, 21 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 22 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED 23 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, 24 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 26 * SUCH DAMAGE. 27 */ 28 29 #include "opt_multiprocessor.h" 30 31 #include <sys/cdefs.h> 32 __KERNEL_RCSID(0, "$NetBSD: psci_fdt.c,v 1.17 2018/09/09 21:16:05 jmcneill Exp $"); 33 34 #include <sys/param.h> 35 #include <sys/bus.h> 36 #include <sys/device.h> 37 #include <sys/systm.h> 38 #include <sys/kernel.h> 39 #include <sys/atomic.h> 40 41 #include <dev/fdt/fdtvar.h> 42 43 #include <arm/locore.h> 44 #include <arm/armreg.h> 45 #include <arm/cpufunc.h> 46 47 #include <arm/arm/psci.h> 48 #include <arm/fdt/psci_fdt.h> 49 50 static int psci_fdt_match(device_t, cfdata_t, void *); 51 static void psci_fdt_attach(device_t, device_t, void *); 52 53 static int psci_fdt_init(const int); 54 55 static const char * const compatible[] = { 56 "arm,psci", 57 "arm,psci-0.2", 58 "arm,psci-1.0", 59 NULL 60 }; 61 62 CFATTACH_DECL_NEW(psci_fdt, 0, psci_fdt_match, psci_fdt_attach, NULL, NULL); 63 64 static void 65 psci_fdt_power_reset(device_t dev) 66 { 67 delay(500000); 68 psci_system_reset(); 69 } 70 71 static void 72 psci_fdt_power_poweroff(device_t dev) 73 { 74 delay(500000); 75 psci_system_off(); 76 } 77 78 static const struct fdtbus_power_controller_func psci_power_funcs = { 79 .reset = psci_fdt_power_reset, 80 .poweroff = psci_fdt_power_poweroff, 81 }; 82 83 static int 84 psci_fdt_match(device_t parent, cfdata_t cf, void *aux) 85 { 86 struct fdt_attach_args * const faa = aux; 87 88 return of_match_compatible(faa->faa_phandle, compatible); 89 } 90 91 static void 92 psci_fdt_attach(device_t parent, device_t self, void *aux) 93 { 94 struct fdt_attach_args * const faa = aux; 95 const int phandle = faa->faa_phandle; 96 97 psci_fdt_init(phandle); 98 99 const uint32_t ver = psci_version(); 100 const u_int ver_maj = __SHIFTOUT(ver, PSCI_VERSION_MAJOR); 101 const u_int ver_min = __SHIFTOUT(ver, PSCI_VERSION_MINOR); 102 103 aprint_naive("\n"); 104 aprint_normal(": PSCI %u.%u\n", ver_maj, ver_min); 105 106 fdtbus_register_power_controller(self, phandle, 107 &psci_power_funcs); 108 } 109 110 static int 111 psci_fdt_init(const int phandle) 112 { 113 const char *method, *psciver; 114 uint32_t val; 115 116 method = fdtbus_get_string(phandle, "method"); 117 psciver = fdtbus_get_string(phandle, "compatible"); 118 if (method == NULL || psciver == NULL) { 119 aprint_error("PSCI: missing required property on /psci\n"); 120 return EINVAL; 121 } 122 123 if (strcmp(method, "smc") == 0) 124 psci_init(psci_call_smc); 125 else if (strcmp(method, "hvc") == 0) 126 psci_init(psci_call_hvc); 127 else { 128 aprint_error("PSCI: unsupported method '%s'\n", method); 129 return EINVAL; 130 } 131 132 /* 133 * If the first compatible string is "arm,psci" then we 134 * are dealing with PSCI 0.1 135 */ 136 if (strcmp(psciver, "arm,psci") == 0) { 137 psci_clearfunc(); 138 if (of_getprop_uint32(phandle, "cpu_on", &val) == 0) 139 psci_setfunc(PSCI_FUNC_CPU_ON, val); 140 } 141 142 return 0; 143 } 144 145 static int 146 psci_fdt_preinit(void) 147 { 148 const int phandle = OF_finddevice("/psci"); 149 if (phandle == -1) { 150 aprint_error("PSCI: no /psci node found\n"); 151 return ENODEV; 152 } 153 154 return psci_fdt_init(phandle); 155 } 156 157 #ifdef MULTIPROCESSOR 158 159 static register_t 160 psci_fdt_mpstart_pa(void) 161 { 162 #ifdef __aarch64__ 163 extern void aarch64_mpstart(void); 164 return (register_t)aarch64_kern_vtophys((vaddr_t)aarch64_mpstart); 165 #else 166 extern void cortex_mpstart(void); 167 return (register_t)cortex_mpstart; 168 #endif 169 } 170 #endif 171 172 static bool 173 psci_fdt_cpu_okay(const int child) 174 { 175 const char *s; 176 177 s = fdtbus_get_string(child, "device_type"); 178 if (!s || strcmp(s, "cpu") != 0) 179 return false; 180 181 s = fdtbus_get_string(child, "status"); 182 if (s) { 183 if (strcmp(s, "okay") == 0) 184 return false; 185 if (strcmp(s, "disabled") == 0) 186 return of_hasprop(child, "enable-method"); 187 return false; 188 } else { 189 return true; 190 } 191 } 192 193 void 194 psci_fdt_bootstrap(void) 195 { 196 #ifdef MULTIPROCESSOR 197 uint64_t mpidr, bp_mpidr; 198 u_int cpuindex; 199 int child; 200 const char *devtype; 201 202 const int cpus = OF_finddevice("/cpus"); 203 if (cpus == -1) { 204 aprint_error("PSCI: no /cpus node found\n"); 205 arm_cpu_max = 1; 206 return; 207 } 208 209 /* Count CPUs */ 210 arm_cpu_max = 0; 211 for (child = OF_child(cpus); child; child = OF_peer(child)) 212 if (fdtbus_status_okay(child) && ((devtype = 213 fdtbus_get_string(child, "device_type")) != NULL) && 214 (strcmp(devtype, "cpu") == 0)) 215 arm_cpu_max++; 216 217 if (psci_fdt_preinit() != 0) 218 return; 219 220 /* MPIDR affinity levels of boot processor. */ 221 bp_mpidr = cpu_mpidr_aff_read(); 222 223 /* Boot APs */ 224 cpuindex = 1; 225 for (child = OF_child(cpus); child; child = OF_peer(child)) { 226 if (!psci_fdt_cpu_okay(child)) 227 continue; 228 if (fdtbus_get_reg64(child, 0, &mpidr, NULL) != 0) 229 continue; 230 if (mpidr == bp_mpidr) 231 continue; /* BP already started */ 232 233 #ifdef __aarch64__ 234 /* argument for mpstart() */ 235 arm_cpu_hatch_arg = cpuindex; 236 cpu_dcache_wb_range((vaddr_t)&arm_cpu_hatch_arg, 237 sizeof(arm_cpu_hatch_arg)); 238 #endif 239 240 int ret = psci_cpu_on(mpidr, psci_fdt_mpstart_pa(), 0); 241 if (ret != PSCI_SUCCESS) 242 continue; 243 244 /* Wait for APs to start */ 245 for (u_int i = 0x4000000; i > 0; i--) { 246 membar_consumer(); 247 if (arm_cpu_hatched & __BIT(cpuindex)) 248 break; 249 } 250 251 cpuindex++; 252 } 253 #endif 254 } 255 256 void 257 psci_fdt_reset(void) 258 { 259 if (psci_fdt_preinit() != 0) { 260 aprint_error("PSCI: reset failed\n"); 261 return; 262 } 263 264 psci_system_reset(); 265 } 266