2 * Copyright (c) 2005 Peter Grehan
3 * Copyright (c) 2009 Nathan Whitehorn
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
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.
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
29 #include <sys/cdefs.h>
30 __FBSDID("$FreeBSD$");
33 * Dispatch platform calls to the appropriate platform implementation
34 * through a previously registered kernel object.
37 #include <sys/param.h>
39 #include <sys/kernel.h>
42 #include <sys/mutex.h>
44 #include <sys/systm.h>
46 #include <sys/sysctl.h>
47 #include <sys/types.h>
50 #include <vm/vm_page.h>
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>
61 #include "platform_if.h"
63 static platform_def_t *plat_def_impl;
64 static platform_t plat_obj;
65 static struct kobj_ops plat_kernel_kops;
66 static struct platform_kobj plat_kernel_obj;
68 static char plat_name[64];
69 SYSCTL_STRING(_hw, OID_AUTO, platform, CTLFLAG_RDTUN | CTLFLAG_NOFETCH, plat_name, 0,
70 "Platform currently in use");
73 * Platform install routines. Highest priority wins, using the same
74 * algorithm as bus attachment.
76 SET_DECLARE(platform_set, platform_def_t);
79 static delay_func platform_delay;
83 platform_probe_and_attach(void)
85 platform_def_t **platpp, *platp;
88 plat_obj = &plat_kernel_obj;
92 * We are unable to use TUNABLE_STR as the read will happen
93 * well after this function has returned.
95 TUNABLE_STR_FETCH("hw.platform", plat_name, sizeof(plat_name));
98 * Try to locate the best platform kobj
100 SET_FOREACH(platpp, platform_set) {
104 * Take care of compiling the selected class, and
105 * then statically initialise the MMU object
107 kobj_class_compile_static((kobj_class_t)platp,
109 kobj_init_static((kobj_t)plat_obj, (kobj_class_t)platp);
111 plat_obj->cls = platp;
113 prio = PLATFORM_PROBE(plat_obj);
115 /* Check for errors */
120 * Check if this module was specifically requested through
121 * the loader tunable we provide.
123 if (strcmp(platp->name,plat_name) == 0) {
124 plat_def_impl = platp;
128 /* Otherwise, see if it is better than our current best */
129 if (plat_def_impl == NULL || prio > best_prio) {
131 plat_def_impl = platp;
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.
141 if (plat_def_impl == NULL)
142 panic("No platform module found!");
145 * Recompile to make sure we ended with the
146 * correct one, and then attach.
149 kobj_class_compile_static((kobj_class_t)plat_def_impl,
151 kobj_init_static((kobj_t)plat_obj, (kobj_class_t)plat_def_impl);
153 strlcpy(plat_name, plat_def_impl->name, sizeof(plat_name));
156 /* Set a default delay function */
157 arm_set_delay(platform_delay, NULL);
160 PLATFORM_ATTACH(plat_obj);
164 platform_devmap_init(void)
167 return PLATFORM_DEVMAP_INIT(plat_obj);
171 platform_lastaddr(void)
174 return PLATFORM_LASTADDR(plat_obj);
178 platform_gpio_init(void)
181 PLATFORM_GPIO_INIT(plat_obj);
185 platform_late_init(void)
188 PLATFORM_LATE_INIT(plat_obj);
195 PLATFORM_CPU_RESET(plat_obj);
197 printf("cpu_reset failed");
207 platform_delay(int usec, void *arg __unused)
211 for (; usec > 0; usec--)
212 for (counts = plat_obj->cls->delay_count; counts > 0; counts--)
214 * Prevent the compiler from optimizing
221 #if defined(SMP) && defined(PLATFORM_SMP)
223 platform_mp_setmaxid(void)
227 PLATFORM_MP_SETMAXID(plat_obj);
229 if (TUNABLE_INT_FETCH("hw.ncpu", &ncpu)) {
230 if (ncpu >= 1 && ncpu <= mp_ncpus) {
238 platform_mp_start_ap(void)
241 PLATFORM_MP_START_AP(plat_obj);