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
platform_obj(void)79 platform_obj(void)
80 {
81
82 return (plat_obj);
83 }
84
85 void
platform_probe_and_attach(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
platform_devmap_init(void)165 platform_devmap_init(void)
166 {
167
168 return PLATFORM_DEVMAP_INIT(plat_obj);
169 }
170
171 vm_offset_t
platform_lastaddr(void)172 platform_lastaddr(void)
173 {
174
175 return PLATFORM_LASTADDR(plat_obj);
176 }
177
178 void
platform_gpio_init(void)179 platform_gpio_init(void)
180 {
181
182 PLATFORM_GPIO_INIT(plat_obj);
183 }
184
185 void
platform_late_init(void)186 platform_late_init(void)
187 {
188
189 PLATFORM_LATE_INIT(plat_obj);
190 }
191
192 void
cpu_reset(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
platform_delay(int usec,void * arg __unused)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
platform_mp_setmaxid(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
platform_mp_start_ap(void)237 platform_mp_start_ap(void)
238 {
239
240 PLATFORM_MP_START_AP(plat_obj);
241 }
242 #endif
243