1 /*-
2 * SPDX-License-Identifier: BSD-2-Clause
3 *
4 * Copyright (c) 2008-2012 Semihalf.
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 *
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
18 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
19 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
20 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
21 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
22 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
23 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
24 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
26 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27 */
28
29 #include <sys/param.h>
30 #include <sys/systm.h>
31 #include <sys/kernel.h>
32 #include <sys/bus.h>
33 #include <sys/pcpu.h>
34 #include <sys/proc.h>
35 #include <sys/smp.h>
36
37 #include <dev/ofw/openfirm.h>
38
39 #include <machine/platform.h>
40 #include <machine/platformvar.h>
41
42 #include "platform_if.h"
43
44 extern uint32_t *bootinfo;
45
46 static int bare_probe(platform_t);
47 static void bare_mem_regions(platform_t, struct mem_region *phys, int *physsz,
48 struct mem_region *avail, int *availsz);
49 static u_long bare_timebase_freq(platform_t, struct cpuref *cpuref);
50
51 static void bare_reset(platform_t);
52
53 static platform_method_t bare_methods[] = {
54 PLATFORMMETHOD(platform_probe, bare_probe),
55 PLATFORMMETHOD(platform_mem_regions, bare_mem_regions),
56 PLATFORMMETHOD(platform_timebase_freq, bare_timebase_freq),
57
58 PLATFORMMETHOD(platform_reset, bare_reset),
59
60 PLATFORMMETHOD_END
61 };
62
63 static platform_def_t bare_platform = {
64 "bare",
65 bare_methods,
66 0
67 };
68
69 PLATFORM_DEF(bare_platform);
70
71 static int
bare_probe(platform_t plat)72 bare_probe(platform_t plat)
73 {
74
75 if (OF_peer(0) == -1) /* Needs device tree to work */
76 return (ENXIO);
77
78 return (BUS_PROBE_GENERIC);
79 }
80
81 void
bare_mem_regions(platform_t plat,struct mem_region * phys,int * physsz,struct mem_region * avail,int * availsz)82 bare_mem_regions(platform_t plat, struct mem_region *phys, int *physsz,
83 struct mem_region *avail, int *availsz)
84 {
85
86 ofw_mem_regions(phys, physsz, avail, availsz);
87 }
88
89 static u_long
bare_timebase_freq(platform_t plat,struct cpuref * cpuref)90 bare_timebase_freq(platform_t plat, struct cpuref *cpuref)
91 {
92 u_long ticks;
93 phandle_t cpus, child;
94 pcell_t freq;
95
96 if (bootinfo != NULL) {
97 if (bootinfo[0] == 1) {
98 /* Backward compatibility. See 8-STABLE. */
99 ticks = bootinfo[3] >> 3;
100 } else {
101 /* Compatibility with Juniper's loader. */
102 ticks = bootinfo[5] >> 3;
103 }
104 } else
105 ticks = 0;
106
107 if ((cpus = OF_finddevice("/cpus")) == -1)
108 goto out;
109
110 if ((child = OF_child(cpus)) == 0)
111 goto out;
112
113 switch (OF_getproplen(child, "timebase-frequency")) {
114 case 4:
115 {
116 uint32_t tbase;
117 OF_getprop(child, "timebase-frequency", &tbase, sizeof(tbase));
118 ticks = tbase;
119 return (ticks);
120 }
121 case 8:
122 {
123 uint64_t tbase;
124 OF_getprop(child, "timebase-frequency", &tbase, sizeof(tbase));
125 ticks = tbase;
126 return (ticks);
127 }
128 default:
129 break;
130 }
131
132 freq = 0;
133 if (OF_getprop(child, "bus-frequency", (void *)&freq,
134 sizeof(freq)) <= 0)
135 goto out;
136
137 /*
138 * Time Base and Decrementer are updated every 8 CCB bus clocks.
139 * HID0[SEL_TBCLK] = 0
140 */
141 if (freq != 0)
142 ticks = freq / 8;
143
144 out:
145 if (ticks <= 0)
146 panic("Unable to determine timebase frequency!");
147
148 return (ticks);
149 }
150
151 static void
bare_reset(platform_t plat)152 bare_reset(platform_t plat)
153 {
154
155 printf("Reset failed...\n");
156 while (1)
157 ;
158 }
159