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1 /*-
2  * Copyright (c) 2008 Marcel Moolenaar
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  *
10  * 1. Redistributions of source code must retain the above copyright
11  *    notice, this list of conditions and the following disclaimer.
12  * 2. Redistributions in binary form must reproduce the above copyright
13  *    notice, this list of conditions and the following disclaimer in the
14  *    documentation and/or other materials provided with the distribution.
15  *
16  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
17  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
18  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
19  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
20  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
21  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
22  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
23  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
24  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
25  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
26  */
27
28 #include <sys/cdefs.h>
29 __FBSDID("$FreeBSD$");
30
31 #include <sys/param.h>
32 #include <sys/systm.h>
33 #include <sys/kernel.h>
34 #include <sys/bus.h>
35 #include <sys/pcpu.h>
36 #include <sys/proc.h>
37 #include <sys/smp.h>
38 #include <vm/vm.h>
39 #include <vm/pmap.h>
40
41 #include <machine/bus.h>
42 #include <machine/cpu.h>
43 #include <machine/hid.h>
44 #include <machine/platformvar.h>
45 #include <machine/pmap.h>
46 #include <machine/smp.h>
47 #include <machine/spr.h>
48
49 #include <dev/ofw/openfirm.h>
50 #include <machine/ofw_machdep.h>
51
52 #include "platform_if.h"
53
54 #ifdef SMP
55 extern void *ap_pcpu;
56 #endif
57
58 static int powermac_probe(platform_t);
59 void powermac_mem_regions(platform_t, struct mem_region **phys, int *physsz,
60     struct mem_region **avail, int *availsz);
61 static u_long powermac_timebase_freq(platform_t, struct cpuref *cpuref);
62 static int powermac_smp_first_cpu(platform_t, struct cpuref *cpuref);
63 static int powermac_smp_next_cpu(platform_t, struct cpuref *cpuref);
64 static int powermac_smp_get_bsp(platform_t, struct cpuref *cpuref);
65 static int powermac_smp_start_cpu(platform_t, struct pcpu *cpu);
66 static void powermac_reset(platform_t);
67
68 static platform_method_t powermac_methods[] = {
69         PLATFORMMETHOD(platform_probe,          powermac_probe),
70         PLATFORMMETHOD(platform_mem_regions,    powermac_mem_regions),
71         PLATFORMMETHOD(platform_timebase_freq,  powermac_timebase_freq),
72         
73         PLATFORMMETHOD(platform_smp_first_cpu,  powermac_smp_first_cpu),
74         PLATFORMMETHOD(platform_smp_next_cpu,   powermac_smp_next_cpu),
75         PLATFORMMETHOD(platform_smp_get_bsp,    powermac_smp_get_bsp),
76         PLATFORMMETHOD(platform_smp_start_cpu,  powermac_smp_start_cpu),
77
78         PLATFORMMETHOD(platform_reset,          powermac_reset),
79
80         { 0, 0 }
81 };
82
83 static platform_def_t powermac_platform = {
84         "powermac",
85         powermac_methods,
86         0
87 };
88
89 PLATFORM_DEF(powermac_platform);
90
91 static int
92 powermac_probe(platform_t plat)
93 {
94         if (OF_finddevice("/memory") != -1 || OF_finddevice("/memory@0") != -1)
95                 return (BUS_PROBE_GENERIC);
96
97         return (ENXIO);
98 }
99
100 void
101 powermac_mem_regions(platform_t plat, struct mem_region **phys, int *physsz,
102     struct mem_region **avail, int *availsz)
103 {
104         ofw_mem_regions(phys,physsz,avail,availsz);
105 }
106
107 static u_long
108 powermac_timebase_freq(platform_t plat, struct cpuref *cpuref)
109 {
110         phandle_t phandle;
111         int32_t ticks = -1;
112
113         phandle = cpuref->cr_hwref;
114
115         OF_getprop(phandle, "timebase-frequency", &ticks, sizeof(ticks));
116
117         if (ticks <= 0)
118                 panic("Unable to determine timebase frequency!");
119
120         return (ticks);
121 }
122
123
124 static int
125 powermac_smp_fill_cpuref(struct cpuref *cpuref, phandle_t cpu)
126 {
127         cell_t cpuid, res;
128
129         cpuref->cr_hwref = cpu;
130         res = OF_getprop(cpu, "reg", &cpuid, sizeof(cpuid));
131
132         /*
133          * psim doesn't have a reg property, so assume 0 as for the
134          * uniprocessor case in the CHRP spec. 
135          */
136         if (res < 0) {
137                 cpuid = 0;
138         }
139
140         cpuref->cr_cpuid = cpuid & 0xff;
141         return (0);
142 }
143
144 static int
145 powermac_smp_first_cpu(platform_t plat, struct cpuref *cpuref)
146 {
147         char buf[8];
148         phandle_t cpu, dev, root;
149         int res;
150
151         root = OF_peer(0);
152
153         dev = OF_child(root);
154         while (dev != 0) {
155                 res = OF_getprop(dev, "name", buf, sizeof(buf));
156                 if (res > 0 && strcmp(buf, "cpus") == 0)
157                         break;
158                 dev = OF_peer(dev);
159         }
160         if (dev == 0) {
161                 /*
162                  * psim doesn't have a name property on the /cpus node,
163                  * but it can be found directly
164                  */
165                 dev = OF_finddevice("/cpus");
166                 if (dev == 0)
167                         return (ENOENT);
168         }
169
170         cpu = OF_child(dev);
171
172         while (cpu != 0) {
173                 res = OF_getprop(cpu, "device_type", buf, sizeof(buf));
174                 if (res > 0 && strcmp(buf, "cpu") == 0)
175                         break;
176                 cpu = OF_peer(cpu);
177         }
178         if (cpu == 0)
179                 return (ENOENT);
180
181         return (powermac_smp_fill_cpuref(cpuref, cpu));
182 }
183
184 static int
185 powermac_smp_next_cpu(platform_t plat, struct cpuref *cpuref)
186 {
187         char buf[8];
188         phandle_t cpu;
189         int res;
190
191         cpu = OF_peer(cpuref->cr_hwref);
192         while (cpu != 0) {
193                 res = OF_getprop(cpu, "device_type", buf, sizeof(buf));
194                 if (res > 0 && strcmp(buf, "cpu") == 0)
195                         break;
196                 cpu = OF_peer(cpu);
197         }
198         if (cpu == 0)
199                 return (ENOENT);
200
201         return (powermac_smp_fill_cpuref(cpuref, cpu));
202 }
203
204 static int
205 powermac_smp_get_bsp(platform_t plat, struct cpuref *cpuref)
206 {
207         ihandle_t inst;
208         phandle_t bsp, chosen;
209         int res;
210
211         chosen = OF_finddevice("/chosen");
212         if (chosen == 0)
213                 return (ENXIO);
214
215         res = OF_getprop(chosen, "cpu", &inst, sizeof(inst));
216         if (res < 0)
217                 return (ENXIO);
218
219         bsp = OF_instance_to_package(inst);
220         return (powermac_smp_fill_cpuref(cpuref, bsp));
221 }
222
223 static int
224 powermac_smp_start_cpu(platform_t plat, struct pcpu *pc)
225 {
226 #ifdef SMP
227         phandle_t cpu;
228         volatile uint8_t *rstvec;
229         static volatile uint8_t *rstvec_virtbase = NULL;
230         int res, reset, timeout;
231
232         cpu = pc->pc_hwref;
233         res = OF_getprop(cpu, "soft-reset", &reset, sizeof(reset));
234         if (res < 0) {
235                 reset = 0x58;
236
237                 switch (pc->pc_cpuid) {
238                 case 0:
239                         reset += 0x03;
240                         break;
241                 case 1:
242                         reset += 0x04;
243                         break;
244                 case 2:
245                         reset += 0x0f;
246                         break;
247                 case 3:
248                         reset += 0x10;
249                         break;
250                 default:
251                         return (ENXIO);
252                 }
253         }
254
255         ap_pcpu = pc;
256
257         if (rstvec_virtbase == NULL)
258                 rstvec_virtbase = pmap_mapdev(0x80000000, PAGE_SIZE);
259
260         rstvec = rstvec_virtbase + reset;
261
262         *rstvec = 4;
263         powerpc_sync();
264         (void)(*rstvec);
265         powerpc_sync();
266         DELAY(1);
267         *rstvec = 0;
268         powerpc_sync();
269         (void)(*rstvec);
270         powerpc_sync();
271
272         timeout = 10000;
273         while (!pc->pc_awake && timeout--)
274                 DELAY(100);
275
276         return ((pc->pc_awake) ? 0 : EBUSY);
277 #else
278         /* No SMP support */
279         return (ENXIO);
280 #endif
281 }
282
283 static void
284 powermac_reset(platform_t platform)
285 {
286         OF_reboot();
287 }
288