xref: /freebsd/sys/powerpc/booke/platform_bare.c (revision b0d29bc47dba79f6f38e67eabadfb4b32ffd9390)
1 /*-
2  * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
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/cdefs.h>
30 __FBSDID("$FreeBSD$");
31 
32 #include <sys/param.h>
33 #include <sys/systm.h>
34 #include <sys/kernel.h>
35 #include <sys/bus.h>
36 #include <sys/pcpu.h>
37 #include <sys/proc.h>
38 #include <sys/smp.h>
39 
40 #include <dev/ofw/openfirm.h>
41 
42 #include <machine/platform.h>
43 #include <machine/platformvar.h>
44 
45 #include "platform_if.h"
46 
47 extern uint32_t *bootinfo;
48 
49 static int bare_probe(platform_t);
50 static void bare_mem_regions(platform_t, struct mem_region *phys, int *physsz,
51     struct mem_region *avail, int *availsz);
52 static u_long bare_timebase_freq(platform_t, struct cpuref *cpuref);
53 
54 static void bare_reset(platform_t);
55 
56 static platform_method_t bare_methods[] = {
57 	PLATFORMMETHOD(platform_probe,		bare_probe),
58 	PLATFORMMETHOD(platform_mem_regions,	bare_mem_regions),
59 	PLATFORMMETHOD(platform_timebase_freq,	bare_timebase_freq),
60 
61 	PLATFORMMETHOD(platform_reset,		bare_reset),
62 
63 	PLATFORMMETHOD_END
64 };
65 
66 static platform_def_t bare_platform = {
67 	"bare",
68 	bare_methods,
69 	0
70 };
71 
72 PLATFORM_DEF(bare_platform);
73 
74 static int
75 bare_probe(platform_t plat)
76 {
77 
78 	if (OF_peer(0) == -1) /* Needs device tree to work */
79 		return (ENXIO);
80 
81 	return (BUS_PROBE_GENERIC);
82 }
83 
84 void
85 bare_mem_regions(platform_t plat, struct mem_region *phys, int *physsz,
86     struct mem_region *avail, int *availsz)
87 {
88 
89 	ofw_mem_regions(phys, physsz, avail, availsz);
90 }
91 
92 static u_long
93 bare_timebase_freq(platform_t plat, struct cpuref *cpuref)
94 {
95 	u_long ticks;
96 	phandle_t cpus, child;
97 	pcell_t freq;
98 
99 	if (bootinfo != NULL) {
100 		if (bootinfo[0] == 1) {
101 			/* Backward compatibility. See 8-STABLE. */
102 			ticks = bootinfo[3] >> 3;
103 		} else {
104 			/* Compatibility with Juniper's loader. */
105 			ticks = bootinfo[5] >> 3;
106 		}
107 	} else
108 		ticks = 0;
109 
110 	if ((cpus = OF_finddevice("/cpus")) == -1)
111 		goto out;
112 
113 	if ((child = OF_child(cpus)) == 0)
114 		goto out;
115 
116 	switch (OF_getproplen(child, "timebase-frequency")) {
117 	case 4:
118 	{
119 		uint32_t tbase;
120 		OF_getprop(child, "timebase-frequency", &tbase, sizeof(tbase));
121 		ticks = tbase;
122 		return (ticks);
123 	}
124 	case 8:
125 	{
126 		uint64_t tbase;
127 		OF_getprop(child, "timebase-frequency", &tbase, sizeof(tbase));
128 		ticks = tbase;
129 		return (ticks);
130 	}
131 	default:
132 		break;
133 	}
134 
135 	freq = 0;
136 	if (OF_getprop(child, "bus-frequency", (void *)&freq,
137 	    sizeof(freq)) <= 0)
138 		goto out;
139 
140 	/*
141 	 * Time Base and Decrementer are updated every 8 CCB bus clocks.
142 	 * HID0[SEL_TBCLK] = 0
143 	 */
144 	if (freq != 0)
145 		ticks = freq / 8;
146 
147 out:
148 	if (ticks <= 0)
149 		panic("Unable to determine timebase frequency!");
150 
151 	return (ticks);
152 }
153 
154 static void
155 bare_reset(platform_t plat)
156 {
157 
158 	printf("Reset failed...\n");
159 	while (1)
160 		;
161 }
162 
163