1 /* $NetBSD: psci_fdt.c,v 1.20 2021/01/27 03:10:19 thorpej 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 1.20 2021/01/27 03:10:19 thorpej Exp $"); 33 34 #include <sys/param.h> 35 #include <sys/atomic.h> 36 #include <sys/bus.h> 37 #include <sys/device.h> 38 #include <sys/kernel.h> 39 #include <sys/systm.h> 40 41 #include <dev/fdt/fdtvar.h> 42 43 #include <arm/arm/psci.h> 44 #include <arm/fdt/psci_fdtvar.h> 45 46 static int psci_fdt_match(device_t, cfdata_t, void *); 47 static void psci_fdt_attach(device_t, device_t, void *); 48 49 static int psci_fdt_init(const int); 50 51 static const struct device_compatible_entry compat_data[] = { 52 { .compat = "arm,psci" }, 53 { .compat = "arm,psci-0.2" }, 54 { .compat = "arm,psci-1.0" }, 55 DEVICE_COMPAT_EOL 56 }; 57 58 CFATTACH_DECL_NEW(psci_fdt, 0, psci_fdt_match, psci_fdt_attach, NULL, NULL); 59 60 static void 61 psci_fdt_power_reset(device_t dev) 62 { 63 delay(500000); 64 psci_system_reset(); 65 } 66 67 static void 68 psci_fdt_power_poweroff(device_t dev) 69 { 70 delay(500000); 71 psci_system_off(); 72 } 73 74 static const struct fdtbus_power_controller_func psci_power_funcs = { 75 .reset = psci_fdt_power_reset, 76 .poweroff = psci_fdt_power_poweroff, 77 }; 78 79 static int 80 psci_fdt_match(device_t parent, cfdata_t cf, void *aux) 81 { 82 struct fdt_attach_args * const faa = aux; 83 84 return of_compatible_match(faa->faa_phandle, compat_data); 85 } 86 87 static void 88 psci_fdt_attach(device_t parent, device_t self, void *aux) 89 { 90 struct fdt_attach_args * const faa = aux; 91 const int phandle = faa->faa_phandle; 92 93 psci_fdt_init(phandle); 94 95 const uint32_t ver = psci_version(); 96 const u_int ver_maj = __SHIFTOUT(ver, PSCI_VERSION_MAJOR); 97 const u_int ver_min = __SHIFTOUT(ver, PSCI_VERSION_MINOR); 98 99 aprint_naive("\n"); 100 aprint_normal(": PSCI %u.%u\n", ver_maj, ver_min); 101 102 fdtbus_register_power_controller(self, phandle, 103 &psci_power_funcs); 104 } 105 106 static int 107 psci_fdt_init(const int phandle) 108 { 109 const char *method, *psciver; 110 uint32_t val; 111 112 method = fdtbus_get_string(phandle, "method"); 113 psciver = fdtbus_get_string(phandle, "compatible"); 114 if (method == NULL || psciver == NULL) { 115 aprint_error("PSCI: missing required property on /psci\n"); 116 return EINVAL; 117 } 118 119 if (strcmp(method, "smc") == 0) 120 psci_init(psci_call_smc); 121 else if (strcmp(method, "hvc") == 0) 122 psci_init(psci_call_hvc); 123 else { 124 aprint_error("PSCI: unsupported method '%s'\n", method); 125 return EINVAL; 126 } 127 128 /* 129 * If the first compatible string is "arm,psci" then we 130 * are dealing with PSCI 0.1 131 */ 132 if (strcmp(psciver, "arm,psci") == 0) { 133 psci_clearfunc(); 134 if (of_getprop_uint32(phandle, "cpu_on", &val) == 0) 135 psci_setfunc(PSCI_FUNC_CPU_ON, val); 136 } 137 138 return 0; 139 } 140 141 int 142 psci_fdt_preinit(void) 143 { 144 const int phandle = OF_finddevice("/psci"); 145 if (phandle == -1) { 146 aprint_error("PSCI: no /psci node found\n"); 147 return ENODEV; 148 } 149 150 return psci_fdt_init(phandle); 151 } 152 153 void 154 psci_fdt_reset(void) 155 { 156 if (psci_fdt_preinit() != 0) { 157 aprint_error("PSCI: reset failed\n"); 158 return; 159 } 160 161 psci_system_reset(); 162 } 163