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__FBSDID("$FreeBSD: stable/11/sys/arm/arm/platform.c 331893 2018-04-02 23:19:07Z gonzo $"); 31 32/* 33 * Dispatch platform calls to the appropriate platform implementation 34 * through a previously registered kernel object. 35 */ 36 37#include <sys/param.h> 38#include <sys/bus.h> 39#include <sys/kernel.h> 40#include <sys/lock.h> 41#include <sys/ktr.h> 42#include <sys/mutex.h> 43#include <sys/rman.h> 44#include <sys/systm.h> 45#include <sys/smp.h> 46#include <sys/sysctl.h> 47#include <sys/types.h> 48 49#include <vm/vm.h> 50#include <vm/vm_page.h> 51 52#include <machine/bus_dma.h> 53#include <machine/cpu.h> 54#include <machine/intr.h> 55#include <machine/machdep.h> 56#include <machine/md_var.h> 57#include <machine/platform.h> 58#include <machine/platformvar.h> 59#include <machine/smp.h> 60 61#include "platform_if.h" 62 63static platform_def_t *plat_def_impl; 64static platform_t plat_obj; 65static struct kobj_ops plat_kernel_kops; 66static struct platform_kobj plat_kernel_obj; 67 68static char plat_name[64]; 69SYSCTL_STRING(_hw, OID_AUTO, platform, CTLFLAG_RDTUN | CTLFLAG_NOFETCH, plat_name, 0, 70 "Platform currently in use"); 71 72/* 73 * Platform install routines. Highest priority wins, using the same 74 * algorithm as bus attachment. 75 */ 76SET_DECLARE(platform_set, platform_def_t); 77 78#ifdef MULTIDELAY 79static delay_func platform_delay; 80#endif 81 82void 83platform_probe_and_attach(void) 84{ 85 platform_def_t **platpp, *platp; 86 int prio, best_prio; 87 88 plat_obj = &plat_kernel_obj; 89 best_prio = 0; 90 91 /* 92 * We are unable to use TUNABLE_STR as the read will happen 93 * well after this function has returned. 94 */ 95 TUNABLE_STR_FETCH("hw.platform", plat_name, sizeof(plat_name)); 96 97 /* 98 * Try to locate the best platform kobj 99 */ 100 SET_FOREACH(platpp, platform_set) { 101 platp = *platpp; 102 103 /* 104 * Take care of compiling the selected class, and 105 * then statically initialise the MMU object 106 */ 107 kobj_class_compile_static((kobj_class_t)platp, 108 &plat_kernel_kops); 109 kobj_init_static((kobj_t)plat_obj, (kobj_class_t)platp); 110 111 plat_obj->cls = platp; 112 113 prio = PLATFORM_PROBE(plat_obj); 114 115 /* Check for errors */ 116 if (prio > 0) 117 continue; 118 119 /* 120 * Check if this module was specifically requested through 121 * the loader tunable we provide. 122 */ 123 if (strcmp(platp->name,plat_name) == 0) { 124 plat_def_impl = platp; 125 break; 126 } 127 128 /* Otherwise, see if it is better than our current best */ 129 if (plat_def_impl == NULL || prio > best_prio) { 130 best_prio = prio; 131 plat_def_impl = platp; 132 } 133 134 /* 135 * We can't free the KOBJ, since it is static. Reset the ops 136 * member of this class so that we can come back later. 137 */ 138 platp->ops = NULL; 139 } 140 141 if (plat_def_impl == NULL) 142 panic("No platform module found!"); 143 144 /* 145 * Recompile to make sure we ended with the 146 * correct one, and then attach. 147 */ 148 149 kobj_class_compile_static((kobj_class_t)plat_def_impl, 150 &plat_kernel_kops); 151 kobj_init_static((kobj_t)plat_obj, (kobj_class_t)plat_def_impl); 152 153 strlcpy(plat_name, plat_def_impl->name, sizeof(plat_name)); 154 155#ifdef MULTIDELAY 156 /* Set a default delay function */ 157 arm_set_delay(platform_delay, NULL); 158#endif 159 160 PLATFORM_ATTACH(plat_obj); 161} 162 163int 164platform_devmap_init(void) 165{ 166 167 return PLATFORM_DEVMAP_INIT(plat_obj); 168} 169 170vm_offset_t 171platform_lastaddr(void) 172{ 173 174 return PLATFORM_LASTADDR(plat_obj); 175} 176 177void 178platform_gpio_init(void) 179{ 180 181 PLATFORM_GPIO_INIT(plat_obj); 182} 183 184void 185platform_late_init(void) 186{ 187 188 PLATFORM_LATE_INIT(plat_obj); 189} 190 191void 192cpu_reset(void) 193{ 194 195 PLATFORM_CPU_RESET(plat_obj); 196 197 printf("cpu_reset failed"); 198 199 intr_disable(); 200 while(1) { 201 cpu_sleep(0); 202 } 203} 204 205#ifdef MULTIDELAY 206static void 207platform_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#endif 220 221#if defined(SMP) && defined(PLATFORM_SMP) 222void 223platform_mp_setmaxid(void) 224{ 225 int ncpu; 226 227 PLATFORM_MP_SETMAXID(plat_obj); 228 229 if (TUNABLE_INT_FETCH("hw.ncpu", &ncpu)) { 230 if (ncpu >= 1 && ncpu <= mp_ncpus) { 231 mp_ncpus = ncpu; 232 mp_maxid = ncpu - 1; 233 } 234 } 235} 236 237void 238platform_mp_start_ap(void) 239{ 240 241 PLATFORM_MP_START_AP(plat_obj); 242} 243#endif 244