1 /* $NetBSD: arm_fdt.c,v 1.12 2020/10/10 15:34:05 jmcneill Exp $ */ 2 3 /*- 4 * Copyright (c) 2017 Jared D. 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_arm_timer.h" 30 #include "opt_efi.h" 31 #include "opt_modular.h" 32 33 #include <sys/cdefs.h> 34 __KERNEL_RCSID(0, "$NetBSD: arm_fdt.c,v 1.12 2020/10/10 15:34:05 jmcneill Exp $"); 35 36 #include <sys/param.h> 37 #include <sys/systm.h> 38 #include <sys/cpu.h> 39 #include <sys/device.h> 40 #include <sys/kmem.h> 41 #include <sys/bus.h> 42 #include <sys/module.h> 43 44 #include <uvm/uvm_extern.h> 45 46 #include <dev/fdt/fdtvar.h> 47 #include <dev/ofw/openfirm.h> 48 49 #include <arm/fdt/arm_fdtvar.h> 50 51 #ifdef EFI_RUNTIME 52 #include <arm/arm/efi_runtime.h> 53 #include <dev/clock_subr.h> 54 #endif 55 56 static int arm_fdt_match(device_t, cfdata_t, void *); 57 static void arm_fdt_attach(device_t, device_t, void *); 58 59 #ifdef EFI_RUNTIME 60 static void arm_fdt_efi_init(device_t); 61 static int arm_fdt_efi_rtc_gettime(todr_chip_handle_t, struct clock_ymdhms *); 62 static int arm_fdt_efi_rtc_settime(todr_chip_handle_t, struct clock_ymdhms *); 63 64 static struct todr_chip_handle efi_todr; 65 #endif 66 67 CFATTACH_DECL_NEW(arm_fdt, 0, 68 arm_fdt_match, arm_fdt_attach, NULL, NULL); 69 70 struct arm_fdt_cpu_hatch_cb { 71 TAILQ_ENTRY(arm_fdt_cpu_hatch_cb) next; 72 void (*cb)(void *, struct cpu_info *); 73 void *priv; 74 }; 75 76 static TAILQ_HEAD(, arm_fdt_cpu_hatch_cb) arm_fdt_cpu_hatch_cbs = 77 TAILQ_HEAD_INITIALIZER(arm_fdt_cpu_hatch_cbs); 78 79 static void (*_arm_fdt_irq_handler)(void *) = NULL; 80 static void (*_arm_fdt_timer_init)(void) = NULL; 81 82 int 83 arm_fdt_match(device_t parent, cfdata_t cf, void *aux) 84 { 85 return 1; 86 } 87 88 void 89 arm_fdt_attach(device_t parent, device_t self, void *aux) 90 { 91 const struct arm_platform *plat = arm_fdt_platform(); 92 struct fdt_attach_args faa; 93 94 aprint_naive("\n"); 95 aprint_normal("\n"); 96 97 #ifdef EFI_RUNTIME 98 arm_fdt_efi_init(self); 99 #endif 100 101 plat->ap_init_attach_args(&faa); 102 faa.faa_name = ""; 103 faa.faa_phandle = OF_peer(0); 104 105 config_found(self, &faa, NULL); 106 } 107 108 const struct arm_platform * 109 arm_fdt_platform(void) 110 { 111 static const struct arm_platform_info *booted_platform = NULL; 112 __link_set_decl(arm_platforms, struct arm_platform_info); 113 struct arm_platform_info * const *info; 114 115 if (booted_platform == NULL) { 116 const struct arm_platform_info *best_info = NULL; 117 const int phandle = OF_peer(0); 118 int match, best_match = 0; 119 120 __link_set_foreach(info, arm_platforms) { 121 const char * const compat[] = { (*info)->api_compat, NULL }; 122 match = of_match_compatible(phandle, compat); 123 if (match > best_match) { 124 best_match = match; 125 best_info = *info; 126 } 127 } 128 129 booted_platform = best_info; 130 } 131 132 /* 133 * No SoC specific platform was found. Try to find a generic 134 * platform definition and use that if available. 135 */ 136 if (booted_platform == NULL) { 137 __link_set_foreach(info, arm_platforms) { 138 if (strcmp((*info)->api_compat, ARM_PLATFORM_DEFAULT) == 0) { 139 booted_platform = *info; 140 break; 141 } 142 } 143 } 144 145 return booted_platform == NULL ? NULL : booted_platform->api_ops; 146 } 147 148 void 149 arm_fdt_cpu_hatch_register(void *priv, void (*cb)(void *, struct cpu_info *)) 150 { 151 struct arm_fdt_cpu_hatch_cb *c; 152 153 c = kmem_alloc(sizeof(*c), KM_SLEEP); 154 c->priv = priv; 155 c->cb = cb; 156 TAILQ_INSERT_TAIL(&arm_fdt_cpu_hatch_cbs, c, next); 157 } 158 159 void 160 arm_fdt_cpu_hatch(struct cpu_info *ci) 161 { 162 struct arm_fdt_cpu_hatch_cb *c; 163 164 TAILQ_FOREACH(c, &arm_fdt_cpu_hatch_cbs, next) 165 c->cb(c->priv, ci); 166 } 167 168 void 169 arm_fdt_irq_set_handler(void (*irq_handler)(void *)) 170 { 171 KASSERT(_arm_fdt_irq_handler == NULL); 172 _arm_fdt_irq_handler = irq_handler; 173 } 174 175 void 176 arm_fdt_irq_handler(void *tf) 177 { 178 _arm_fdt_irq_handler(tf); 179 } 180 181 void 182 arm_fdt_timer_register(void (*timerfn)(void)) 183 { 184 if (_arm_fdt_timer_init != NULL) { 185 #ifdef DIAGNOSTIC 186 aprint_verbose("%s: timer already registered\n", __func__); 187 #endif 188 return; 189 } 190 _arm_fdt_timer_init = timerfn; 191 } 192 193 void 194 arm_fdt_memory_dump(paddr_t pa) 195 { 196 const struct arm_platform *plat = arm_fdt_platform(); 197 struct fdt_attach_args faa; 198 bus_space_tag_t bst; 199 bus_space_handle_t bsh; 200 201 plat->ap_init_attach_args(&faa); 202 203 bst = faa.faa_bst; 204 bus_space_map(bst, pa, 0x100, 0, &bsh); 205 206 for (int i = 0; i < 0x100; i += 0x10) { 207 printf("%" PRIxPTR ": %08x %08x %08x %08x\n", 208 (uintptr_t)(pa + i), 209 bus_space_read_4(bst, bsh, i + 0), 210 bus_space_read_4(bst, bsh, i + 4), 211 bus_space_read_4(bst, bsh, i + 8), 212 bus_space_read_4(bst, bsh, i + 12)); 213 } 214 } 215 216 #ifdef __HAVE_GENERIC_CPU_INITCLOCKS 217 void 218 cpu_initclocks(void) 219 { 220 if (_arm_fdt_timer_init == NULL) 221 panic("cpu_initclocks: no timer registered"); 222 _arm_fdt_timer_init(); 223 } 224 #endif 225 226 void 227 arm_fdt_module_init(void) 228 { 229 #ifdef MODULAR 230 const int chosen = OF_finddevice("/chosen"); 231 const char *module_name; 232 const uint64_t *data; 233 u_int index; 234 paddr_t pa; 235 vaddr_t va; 236 int len; 237 238 if (chosen == -1) 239 return; 240 241 data = fdtbus_get_prop(chosen, "netbsd,modules", &len); 242 if (data == NULL) 243 return; 244 245 for (index = 0; index < len / 16; index++, data += 2) { 246 module_name = fdtbus_get_string_index(chosen, 247 "netbsd,module-names", index); 248 if (module_name == NULL) 249 break; 250 251 const paddr_t startpa = (paddr_t)be64dec(data + 0); 252 const size_t size = (size_t)be64dec(data + 1); 253 const paddr_t endpa = round_page(startpa + size); 254 255 const vaddr_t startva = uvm_km_alloc(kernel_map, endpa - startpa, 256 0, UVM_KMF_VAONLY | UVM_KMF_NOWAIT); 257 if (startva == 0) { 258 printf("ERROR: Cannot allocate VA for module %s\n", 259 module_name); 260 continue; 261 } 262 263 for (pa = startpa, va = startva; 264 pa < endpa; 265 pa += PAGE_SIZE, va += PAGE_SIZE) { 266 pmap_kenter_pa(va, pa, VM_PROT_ALL, PMAP_WRITE_BACK); 267 } 268 pmap_update(pmap_kernel()); 269 270 module_prime(module_name, (void *)(uintptr_t)startva, size); 271 } 272 #endif /* !MODULAR */ 273 } 274 275 #ifdef EFI_RUNTIME 276 static void 277 arm_fdt_efi_init(device_t dev) 278 { 279 uint64_t efi_system_table; 280 struct efi_tm tm; 281 int error; 282 283 const int chosen = OF_finddevice("/chosen"); 284 if (chosen < 0) 285 return; 286 287 if (of_getprop_uint64(chosen, "netbsd,uefi-system-table", &efi_system_table) != 0) 288 return; 289 290 error = arm_efirt_init(efi_system_table); 291 if (error) 292 return; 293 294 aprint_debug_dev(dev, "EFI system table at %#" PRIx64 "\n", efi_system_table); 295 296 if (arm_efirt_gettime(&tm) == 0) { 297 aprint_normal_dev(dev, "using EFI runtime services for RTC\n"); 298 efi_todr.cookie = NULL; 299 efi_todr.todr_gettime_ymdhms = arm_fdt_efi_rtc_gettime; 300 efi_todr.todr_settime_ymdhms = arm_fdt_efi_rtc_settime; 301 todr_attach(&efi_todr); 302 } 303 } 304 305 static int 306 arm_fdt_efi_rtc_gettime(todr_chip_handle_t tch, struct clock_ymdhms *dt) 307 { 308 struct efi_tm tm; 309 int error; 310 311 error = arm_efirt_gettime(&tm); 312 if (error) 313 return error; 314 315 dt->dt_year = tm.tm_year; 316 dt->dt_mon = tm.tm_mon; 317 dt->dt_day = tm.tm_mday; 318 dt->dt_wday = 0; 319 dt->dt_hour = tm.tm_hour; 320 dt->dt_min = tm.tm_min; 321 dt->dt_sec = tm.tm_sec; 322 323 return 0; 324 } 325 326 static int 327 arm_fdt_efi_rtc_settime(todr_chip_handle_t tch, struct clock_ymdhms *dt) 328 { 329 struct efi_tm tm; 330 331 memset(&tm, 0, sizeof(tm)); 332 tm.tm_year = dt->dt_year; 333 tm.tm_mon = dt->dt_mon; 334 tm.tm_mday = dt->dt_day; 335 tm.tm_hour = dt->dt_hour; 336 tm.tm_min = dt->dt_min; 337 tm.tm_sec = dt->dt_sec; 338 339 return arm_efirt_settime(&tm); 340 } 341 #endif 342