1 /*- 2 * Copyright (C) 2009 Nathan Whitehorn 3 * Copyright (C) 2015 The FreeBSD Foundation 4 * All rights reserved. 5 * 6 * Portions of this software were developed by Andrew Turner 7 * under sponsorship from the FreeBSD Foundation. 8 * 9 * Redistribution and use in source and binary forms, with or without 10 * modification, are permitted provided that the following conditions 11 * are met: 12 * 1. Redistributions of source code must retain the above copyright 13 * notice, this list of conditions and the following disclaimer. 14 * 2. Redistributions in binary form must reproduce the above copyright 15 * notice, this list of conditions and the following disclaimer in the 16 * documentation and/or other materials provided with the distribution. 17 * 18 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 19 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 21 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 22 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 23 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 24 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 25 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 26 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 27 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 28 * SUCH DAMAGE. 29 */ 30 31 #include <sys/param.h> 32 #include <sys/systm.h> 33 #include <sys/kernel.h> 34 #include <sys/module.h> 35 #include <sys/malloc.h> 36 #include <sys/bus.h> 37 #include <sys/cpu.h> 38 #include <machine/bus.h> 39 40 #include <dev/ofw/openfirm.h> 41 #include <dev/ofw/ofw_bus.h> 42 #include <dev/ofw/ofw_bus_subr.h> 43 #include <dev/ofw/ofw_cpu.h> 44 45 #if defined(__arm__) || defined(__arm64__) || defined(__riscv__) 46 #include <dev/extres/clk/clk.h> 47 #endif 48 49 static int ofw_cpulist_probe(device_t); 50 static int ofw_cpulist_attach(device_t); 51 static const struct ofw_bus_devinfo *ofw_cpulist_get_devinfo(device_t dev, 52 device_t child); 53 54 static MALLOC_DEFINE(M_OFWCPU, "ofwcpu", "OFW CPU device information"); 55 56 struct ofw_cpulist_softc { 57 pcell_t sc_addr_cells; 58 }; 59 60 static device_method_t ofw_cpulist_methods[] = { 61 /* Device interface */ 62 DEVMETHOD(device_probe, ofw_cpulist_probe), 63 DEVMETHOD(device_attach, ofw_cpulist_attach), 64 65 /* Bus interface */ 66 DEVMETHOD(bus_add_child, bus_generic_add_child), 67 DEVMETHOD(bus_child_pnpinfo, ofw_bus_gen_child_pnpinfo), 68 DEVMETHOD(bus_get_device_path, ofw_bus_gen_get_device_path), 69 70 /* ofw_bus interface */ 71 DEVMETHOD(ofw_bus_get_devinfo, ofw_cpulist_get_devinfo), 72 DEVMETHOD(ofw_bus_get_compat, ofw_bus_gen_get_compat), 73 DEVMETHOD(ofw_bus_get_model, ofw_bus_gen_get_model), 74 DEVMETHOD(ofw_bus_get_name, ofw_bus_gen_get_name), 75 DEVMETHOD(ofw_bus_get_node, ofw_bus_gen_get_node), 76 DEVMETHOD(ofw_bus_get_type, ofw_bus_gen_get_type), 77 78 DEVMETHOD_END 79 }; 80 81 static driver_t ofw_cpulist_driver = { 82 "cpulist", 83 ofw_cpulist_methods, 84 sizeof(struct ofw_cpulist_softc) 85 }; 86 87 DRIVER_MODULE(ofw_cpulist, ofwbus, ofw_cpulist_driver, 0, 0); 88 89 static int 90 ofw_cpulist_probe(device_t dev) 91 { 92 const char *name; 93 94 name = ofw_bus_get_name(dev); 95 96 if (name == NULL || strcmp(name, "cpus") != 0) 97 return (ENXIO); 98 99 device_set_desc(dev, "Open Firmware CPU Group"); 100 101 return (0); 102 } 103 104 static int 105 ofw_cpulist_attach(device_t dev) 106 { 107 struct ofw_cpulist_softc *sc; 108 phandle_t root, child; 109 device_t cdev; 110 struct ofw_bus_devinfo *dinfo; 111 112 sc = device_get_softc(dev); 113 root = ofw_bus_get_node(dev); 114 115 sc->sc_addr_cells = 1; 116 OF_getencprop(root, "#address-cells", &sc->sc_addr_cells, 117 sizeof(sc->sc_addr_cells)); 118 119 for (child = OF_child(root); child != 0; child = OF_peer(child)) { 120 dinfo = malloc(sizeof(*dinfo), M_OFWCPU, M_WAITOK | M_ZERO); 121 122 if (ofw_bus_gen_setup_devinfo(dinfo, child) != 0) { 123 free(dinfo, M_OFWCPU); 124 continue; 125 } 126 cdev = device_add_child(dev, NULL, -1); 127 if (cdev == NULL) { 128 device_printf(dev, "<%s>: device_add_child failed\n", 129 dinfo->obd_name); 130 ofw_bus_gen_destroy_devinfo(dinfo); 131 free(dinfo, M_OFWCPU); 132 continue; 133 } 134 device_set_ivars(cdev, dinfo); 135 } 136 137 return (bus_generic_attach(dev)); 138 } 139 140 static const struct ofw_bus_devinfo * 141 ofw_cpulist_get_devinfo(device_t dev, device_t child) 142 { 143 return (device_get_ivars(child)); 144 } 145 146 static int ofw_cpu_probe(device_t); 147 static int ofw_cpu_attach(device_t); 148 static int ofw_cpu_read_ivar(device_t dev, device_t child, int index, 149 uintptr_t *result); 150 151 struct ofw_cpu_softc { 152 struct pcpu *sc_cpu_pcpu; 153 uint32_t sc_nominal_mhz; 154 boolean_t sc_reg_valid; 155 pcell_t sc_reg[2]; 156 }; 157 158 static device_method_t ofw_cpu_methods[] = { 159 /* Device interface */ 160 DEVMETHOD(device_probe, ofw_cpu_probe), 161 DEVMETHOD(device_attach, ofw_cpu_attach), 162 163 /* Bus interface */ 164 DEVMETHOD(bus_add_child, bus_generic_add_child), 165 DEVMETHOD(bus_read_ivar, ofw_cpu_read_ivar), 166 DEVMETHOD(bus_setup_intr, bus_generic_setup_intr), 167 DEVMETHOD(bus_teardown_intr, bus_generic_teardown_intr), 168 DEVMETHOD(bus_alloc_resource, bus_generic_alloc_resource), 169 DEVMETHOD(bus_release_resource, bus_generic_release_resource), 170 DEVMETHOD(bus_activate_resource,bus_generic_activate_resource), 171 172 DEVMETHOD_END 173 }; 174 175 static driver_t ofw_cpu_driver = { 176 "cpu", 177 ofw_cpu_methods, 178 sizeof(struct ofw_cpu_softc) 179 }; 180 181 DRIVER_MODULE(ofw_cpu, cpulist, ofw_cpu_driver, 0, 0); 182 183 static int 184 ofw_cpu_probe(device_t dev) 185 { 186 const char *type = ofw_bus_get_type(dev); 187 188 if (type == NULL || strcmp(type, "cpu") != 0) 189 return (ENXIO); 190 191 device_set_desc(dev, "Open Firmware CPU"); 192 if (!bootverbose && device_get_unit(dev) != 0) { 193 device_quiet(dev); 194 device_quiet_children(dev); 195 } 196 197 return (0); 198 } 199 200 static int 201 ofw_cpu_attach(device_t dev) 202 { 203 struct ofw_cpulist_softc *psc; 204 struct ofw_cpu_softc *sc; 205 phandle_t node; 206 pcell_t cell; 207 int rv; 208 #if defined(__arm__) || defined(__arm64__) || defined(__riscv__) 209 clk_t cpuclk; 210 uint64_t freq; 211 #endif 212 213 sc = device_get_softc(dev); 214 psc = device_get_softc(device_get_parent(dev)); 215 216 if (nitems(sc->sc_reg) < psc->sc_addr_cells) { 217 if (bootverbose) 218 device_printf(dev, "Too many address cells\n"); 219 return (EINVAL); 220 } 221 222 node = ofw_bus_get_node(dev); 223 224 /* Read and validate the reg property for use later */ 225 sc->sc_reg_valid = false; 226 rv = OF_getencprop(node, "reg", sc->sc_reg, sizeof(sc->sc_reg)); 227 if (rv < 0) 228 device_printf(dev, "missing 'reg' property\n"); 229 else if ((rv % 4) != 0) { 230 if (bootverbose) 231 device_printf(dev, "Malformed reg property\n"); 232 } else if ((rv / 4) != psc->sc_addr_cells) { 233 if (bootverbose) 234 device_printf(dev, "Invalid reg size %u\n", rv); 235 } else 236 sc->sc_reg_valid = true; 237 238 #ifdef __powerpc__ 239 /* 240 * On powerpc, "interrupt-servers" denotes a SMT CPU. Look for any 241 * thread on this CPU, and assign that. 242 */ 243 if (OF_hasprop(node, "ibm,ppc-interrupt-server#s")) { 244 struct cpuref cpuref; 245 cell_t *servers; 246 int i, nservers, rv; 247 248 if ((nservers = OF_getencprop_alloc(node, 249 "ibm,ppc-interrupt-server#s", (void **)&servers)) < 0) 250 return (ENXIO); 251 nservers /= sizeof(cell_t); 252 for (i = 0; i < nservers; i++) { 253 for (rv = platform_smp_first_cpu(&cpuref); rv == 0; 254 rv = platform_smp_next_cpu(&cpuref)) { 255 if (cpuref.cr_hwref == servers[i]) { 256 sc->sc_cpu_pcpu = 257 pcpu_find(cpuref.cr_cpuid); 258 if (sc->sc_cpu_pcpu == NULL) { 259 OF_prop_free(servers); 260 return (ENXIO); 261 } 262 break; 263 } 264 } 265 if (rv != ENOENT) 266 break; 267 } 268 OF_prop_free(servers); 269 if (sc->sc_cpu_pcpu == NULL) { 270 device_printf(dev, "No CPU found for this device.\n"); 271 return (ENXIO); 272 } 273 } else 274 #endif 275 sc->sc_cpu_pcpu = pcpu_find(device_get_unit(dev)); 276 277 if (OF_getencprop(node, "clock-frequency", &cell, sizeof(cell)) < 0) { 278 #if defined(__arm__) || defined(__arm64__) || defined(__riscv__) 279 rv = clk_get_by_ofw_index(dev, 0, 0, &cpuclk); 280 if (rv == 0) { 281 rv = clk_get_freq(cpuclk, &freq); 282 if (rv != 0 && bootverbose) 283 device_printf(dev, 284 "Cannot get freq of property clocks\n"); 285 else 286 sc->sc_nominal_mhz = freq / 1000000; 287 } else 288 #endif 289 { 290 if (bootverbose) 291 device_printf(dev, 292 "missing 'clock-frequency' property\n"); 293 } 294 } else 295 sc->sc_nominal_mhz = cell / 1000000; /* convert to MHz */ 296 297 if (sc->sc_nominal_mhz != 0 && bootverbose) 298 device_printf(dev, "Nominal frequency %dMhz\n", 299 sc->sc_nominal_mhz); 300 bus_generic_probe(dev); 301 return (bus_generic_attach(dev)); 302 } 303 304 static int 305 ofw_cpu_read_ivar(device_t dev, device_t child, int index, uintptr_t *result) 306 { 307 struct ofw_cpulist_softc *psc; 308 struct ofw_cpu_softc *sc; 309 310 sc = device_get_softc(dev); 311 312 switch (index) { 313 case CPU_IVAR_PCPU: 314 *result = (uintptr_t)sc->sc_cpu_pcpu; 315 return (0); 316 case CPU_IVAR_NOMINAL_MHZ: 317 if (sc->sc_nominal_mhz > 0) { 318 *result = (uintptr_t)sc->sc_nominal_mhz; 319 return (0); 320 } 321 break; 322 case CPU_IVAR_CPUID_SIZE: 323 psc = device_get_softc(device_get_parent(dev)); 324 *result = psc->sc_addr_cells; 325 return (0); 326 case CPU_IVAR_CPUID: 327 if (sc->sc_reg_valid) { 328 *result = (uintptr_t)sc->sc_reg; 329 return (0); 330 } 331 break; 332 } 333 334 return (ENOENT); 335 } 336 337 int 338 ofw_cpu_early_foreach(ofw_cpu_foreach_cb callback, boolean_t only_runnable) 339 { 340 phandle_t node, child; 341 pcell_t addr_cells, reg[2]; 342 char status[16]; 343 char device_type[16]; 344 u_int id, next_id; 345 int count, rv; 346 347 count = 0; 348 id = 0; 349 next_id = 0; 350 351 node = OF_finddevice("/cpus"); 352 if (node == -1) 353 return (-1); 354 355 /* Find the number of cells in the cpu register */ 356 if (OF_getencprop(node, "#address-cells", &addr_cells, 357 sizeof(addr_cells)) < 0) 358 return (-1); 359 360 for (child = OF_child(node); child != 0; child = OF_peer(child), 361 id = next_id) { 362 /* Check if child is a CPU */ 363 memset(device_type, 0, sizeof(device_type)); 364 rv = OF_getprop(child, "device_type", device_type, 365 sizeof(device_type) - 1); 366 if (rv < 0) 367 continue; 368 if (strcmp(device_type, "cpu") != 0) 369 continue; 370 371 /* We're processing CPU, update next_id used in the next iteration */ 372 next_id++; 373 374 /* 375 * If we are filtering by runnable then limit to only 376 * those that have been enabled, or do provide a method 377 * to enable them. 378 */ 379 if (only_runnable) { 380 status[0] = '\0'; 381 OF_getprop(child, "status", status, sizeof(status)); 382 if (status[0] != '\0' && strcmp(status, "okay") != 0 && 383 strcmp(status, "ok") != 0 && 384 !OF_hasprop(child, "enable-method")) 385 continue; 386 } 387 388 /* 389 * Check we have a register to identify the cpu 390 */ 391 rv = OF_getencprop(child, "reg", reg, 392 addr_cells * sizeof(cell_t)); 393 if (rv != addr_cells * sizeof(cell_t)) 394 continue; 395 396 if (callback == NULL || callback(id, child, addr_cells, reg)) 397 count++; 398 } 399 400 return (only_runnable ? count : id); 401 } 402