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1 /*-
2  * Copyright (c) 2008-2012 Semihalf.
3  * All rights reserved.
4  *
5  * Redistribution and use in source and binary forms, with or without
6  * modification, are permitted provided that the following conditions
7  * are met:
8  *
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 ``AS IS'' AND ANY EXPRESS OR
16  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
17  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
18  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
19  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
20  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
21  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
22  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
23  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
24  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
25  */
26
27 #include <sys/cdefs.h>
28 __FBSDID("$FreeBSD$");
29
30 #include <sys/param.h>
31 #include <sys/systm.h>
32 #include <sys/kernel.h>
33 #include <sys/bus.h>
34 #include <sys/pcpu.h>
35 #include <sys/proc.h>
36 #include <sys/smp.h>
37
38 #include <dev/ofw/openfirm.h>
39
40 #include <machine/platform.h>
41 #include <machine/platformvar.h>
42
43 #include "platform_if.h"
44
45 extern uint32_t *bootinfo;
46
47 static int bare_probe(platform_t);
48 static void bare_mem_regions(platform_t, struct mem_region *phys, int *physsz,
49     struct mem_region *avail, int *availsz);
50 static u_long bare_timebase_freq(platform_t, struct cpuref *cpuref);
51
52 static void bare_reset(platform_t);
53
54 static platform_method_t bare_methods[] = {
55         PLATFORMMETHOD(platform_probe,          bare_probe),
56         PLATFORMMETHOD(platform_mem_regions,    bare_mem_regions),
57         PLATFORMMETHOD(platform_timebase_freq,  bare_timebase_freq),
58
59         PLATFORMMETHOD(platform_reset,          bare_reset),
60
61         PLATFORMMETHOD_END
62 };
63
64 static platform_def_t bare_platform = {
65         "bare",
66         bare_methods,
67         0
68 };
69
70 PLATFORM_DEF(bare_platform);
71
72 static int
73 bare_probe(platform_t plat)
74 {
75
76         if (OF_peer(0) == -1) /* Needs device tree to work */
77                 return (ENXIO);
78
79         return (BUS_PROBE_GENERIC);
80 }
81
82 void
83 bare_mem_regions(platform_t plat, struct mem_region *phys, int *physsz,
84     struct mem_region *avail, int *availsz)
85 {
86
87         ofw_mem_regions(phys, physsz, avail, availsz);
88 }
89
90 static u_long
91 bare_timebase_freq(platform_t plat, struct cpuref *cpuref)
92 {
93         u_long ticks;
94         phandle_t cpus, child;
95         pcell_t freq;
96
97         if (bootinfo != NULL) {
98                 if (bootinfo[0] == 1) {
99                         /* Backward compatibility. See 8-STABLE. */
100                         ticks = bootinfo[3] >> 3;
101                 } else {
102                         /* Compatibility with Juniper's loader. */
103                         ticks = bootinfo[5] >> 3;
104                 }
105         } else
106                 ticks = 0;
107
108         if ((cpus = OF_finddevice("/cpus")) == -1)
109                 goto out;
110
111         if ((child = OF_child(cpus)) == 0)
112                 goto out;
113
114         switch (OF_getproplen(child, "timebase-frequency")) {
115         case 4:
116         {
117                 uint32_t tbase;
118                 OF_getprop(child, "timebase-frequency", &tbase, sizeof(tbase));
119                 ticks = tbase;
120                 return (ticks);
121         }
122         case 8:
123         {
124                 uint64_t tbase;
125                 OF_getprop(child, "timebase-frequency", &tbase, sizeof(tbase));
126                 ticks = tbase;
127                 return (ticks);
128         }
129         default:
130                 break;
131         }
132
133         freq = 0;
134         if (OF_getprop(child, "bus-frequency", (void *)&freq,
135             sizeof(freq)) <= 0)
136                 goto out;
137
138         /*
139          * Time Base and Decrementer are updated every 8 CCB bus clocks.
140          * HID0[SEL_TBCLK] = 0
141          */
142         if (freq != 0)
143                 ticks = freq / 8;
144
145 out:
146         if (ticks <= 0)
147                 panic("Unable to determine timebase frequency!");
148
149         return (ticks);
150 }
151
152 static void
153 bare_reset(platform_t plat)
154 {
155
156         printf("Reset failed...\n");
157         while (1)
158                 ;
159 }
160