1 /*- 2 * Copyright (c) 2005 Peter Grehan 3 * Copyright (c) 2009 Nathan Whitehorn 4 * All rights reserved. 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions 8 * are met: 9 * 1. Redistributions of source code must retain the above copyright 10 * notice, this list of conditions and the following disclaimer. 11 * 2. Redistributions in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in the 13 * documentation and/or other materials provided with the distribution. 14 * 15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 16 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 17 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 18 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 19 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 20 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 21 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 22 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 23 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 24 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 25 * SUCH DAMAGE. 26 * 27 */ 28 29 #include <sys/cdefs.h> 30 /* 31 * Dispatch platform calls to the appropriate platform implementation 32 * through a previously registered kernel object. 33 */ 34 35 #include <sys/param.h> 36 #include <sys/bus.h> 37 #include <sys/kernel.h> 38 #include <sys/lock.h> 39 #include <sys/ktr.h> 40 #include <sys/mutex.h> 41 #include <sys/rman.h> 42 #include <sys/systm.h> 43 #include <sys/smp.h> 44 #include <sys/sysctl.h> 45 #include <sys/types.h> 46 47 #include <vm/vm.h> 48 #include <vm/vm_page.h> 49 50 #include <machine/bus_dma.h> 51 #include <machine/cpu.h> 52 #include <machine/intr.h> 53 #include <machine/machdep.h> 54 #include <machine/md_var.h> 55 #include <machine/platform.h> 56 #include <machine/platformvar.h> 57 #include <machine/smp.h> 58 59 #include "platform_if.h" 60 61 static platform_def_t *plat_def_impl; 62 static platform_t plat_obj; 63 static struct kobj_ops plat_kernel_kops; 64 static struct platform_kobj plat_kernel_obj; 65 66 static char plat_name[64]; 67 SYSCTL_STRING(_hw, OID_AUTO, platform, CTLFLAG_RDTUN | CTLFLAG_NOFETCH, plat_name, 0, 68 "Platform currently in use"); 69 70 /* 71 * Platform install routines. Highest priority wins, using the same 72 * algorithm as bus attachment. 73 */ 74 SET_DECLARE(platform_set, platform_def_t); 75 76 static delay_func platform_delay; 77 78 platform_t 79 platform_obj(void) 80 { 81 82 return (plat_obj); 83 } 84 85 void 86 platform_probe_and_attach(void) 87 { 88 platform_def_t **platpp, *platp; 89 int prio, best_prio; 90 91 plat_obj = &plat_kernel_obj; 92 best_prio = 0; 93 94 /* 95 * We are unable to use TUNABLE_STR as the read will happen 96 * well after this function has returned. 97 */ 98 TUNABLE_STR_FETCH("hw.platform", plat_name, sizeof(plat_name)); 99 100 /* 101 * Try to locate the best platform kobj 102 */ 103 SET_FOREACH(platpp, platform_set) { 104 platp = *platpp; 105 106 /* 107 * Take care of compiling the selected class, and 108 * then statically initialise the MMU object 109 */ 110 kobj_class_compile_static((kobj_class_t)platp, 111 &plat_kernel_kops); 112 kobj_init_static((kobj_t)plat_obj, (kobj_class_t)platp); 113 114 plat_obj->cls = platp; 115 116 prio = PLATFORM_PROBE(plat_obj); 117 118 /* Check for errors */ 119 if (prio > 0) 120 continue; 121 122 /* 123 * Check if this module was specifically requested through 124 * the loader tunable we provide. 125 */ 126 if (strcmp(platp->name,plat_name) == 0) { 127 plat_def_impl = platp; 128 break; 129 } 130 131 /* Otherwise, see if it is better than our current best */ 132 if (plat_def_impl == NULL || prio > best_prio) { 133 best_prio = prio; 134 plat_def_impl = platp; 135 } 136 137 /* 138 * We can't free the KOBJ, since it is static. Reset the ops 139 * member of this class so that we can come back later. 140 */ 141 platp->ops = NULL; 142 } 143 144 if (plat_def_impl == NULL) 145 panic("No platform module found!"); 146 147 /* 148 * Recompile to make sure we ended with the 149 * correct one, and then attach. 150 */ 151 152 kobj_class_compile_static((kobj_class_t)plat_def_impl, 153 &plat_kernel_kops); 154 kobj_init_static((kobj_t)plat_obj, (kobj_class_t)plat_def_impl); 155 156 strlcpy(plat_name, plat_def_impl->name, sizeof(plat_name)); 157 158 /* Set a default delay function */ 159 arm_set_delay(platform_delay, NULL); 160 161 PLATFORM_ATTACH(plat_obj); 162 } 163 164 int 165 platform_devmap_init(void) 166 { 167 168 return PLATFORM_DEVMAP_INIT(plat_obj); 169 } 170 171 vm_offset_t 172 platform_lastaddr(void) 173 { 174 175 return PLATFORM_LASTADDR(plat_obj); 176 } 177 178 void 179 platform_gpio_init(void) 180 { 181 182 PLATFORM_GPIO_INIT(plat_obj); 183 } 184 185 void 186 platform_late_init(void) 187 { 188 189 PLATFORM_LATE_INIT(plat_obj); 190 } 191 192 void 193 cpu_reset(void) 194 { 195 196 PLATFORM_CPU_RESET(plat_obj); 197 198 printf("cpu_reset failed"); 199 200 intr_disable(); 201 while(1) { 202 cpu_sleep(0); 203 } 204 } 205 206 static void 207 platform_delay(int usec, void *arg __unused) 208 { 209 int counts; 210 211 for (; usec > 0; usec--) 212 for (counts = plat_obj->cls->delay_count; counts > 0; counts--) 213 /* 214 * Prevent the compiler from optimizing 215 * out the loop 216 */ 217 cpufunc_nullop(); 218 } 219 220 #if defined(SMP) 221 void 222 platform_mp_setmaxid(void) 223 { 224 int ncpu; 225 226 PLATFORM_MP_SETMAXID(plat_obj); 227 228 if (TUNABLE_INT_FETCH("hw.ncpu", &ncpu)) { 229 if (ncpu >= 1 && ncpu <= mp_ncpus) { 230 mp_ncpus = ncpu; 231 mp_maxid = ncpu - 1; 232 } 233 } 234 } 235 236 void 237 platform_mp_start_ap(void) 238 { 239 240 PLATFORM_MP_START_AP(plat_obj); 241 } 242 #endif 243