platform_powermac.c revision 209853 
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: head/sys/powerpc/aim/platform_chrp.c 209853 2010-07-09 14:04:16Z nwhitehorn $");
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
55extern void *ap_pcpu;
56#endif
57
58static int chrp_probe(platform_t);
59void chrp_mem_regions(platform_t, struct mem_region **phys, int *physsz,
60    struct mem_region **avail, int *availsz);
61static u_long chrp_timebase_freq(platform_t, struct cpuref *cpuref);
62static int chrp_smp_first_cpu(platform_t, struct cpuref *cpuref);
63static int chrp_smp_next_cpu(platform_t, struct cpuref *cpuref);
64static int chrp_smp_get_bsp(platform_t, struct cpuref *cpuref);
65static int chrp_smp_start_cpu(platform_t, struct pcpu *cpu);
66
67static platform_method_t chrp_methods[] = {
68	PLATFORMMETHOD(platform_probe, 		chrp_probe),
69	PLATFORMMETHOD(platform_mem_regions,	chrp_mem_regions),
70	PLATFORMMETHOD(platform_timebase_freq,	chrp_timebase_freq),
71
72	PLATFORMMETHOD(platform_smp_first_cpu,	chrp_smp_first_cpu),
73	PLATFORMMETHOD(platform_smp_next_cpu,	chrp_smp_next_cpu),
74	PLATFORMMETHOD(platform_smp_get_bsp,	chrp_smp_get_bsp),
75	PLATFORMMETHOD(platform_smp_start_cpu,	chrp_smp_start_cpu),
76
77	{ 0, 0 }
78};
79
80static platform_def_t chrp_platform = {
81	"chrp",
82	chrp_methods,
83	0
84};
85
86PLATFORM_DEF(chrp_platform);
87
88static int
89chrp_probe(platform_t plat)
90{
91	if (OF_finddevice("/memory") != -1 || OF_finddevice("/memory@0") != -1)
92		return (BUS_PROBE_GENERIC);
93
94	return (ENXIO);
95}
96
97void
98chrp_mem_regions(platform_t plat, struct mem_region **phys, int *physsz,
99    struct mem_region **avail, int *availsz)
100{
101	ofw_mem_regions(phys,physsz,avail,availsz);
102}
103
104static u_long
105chrp_timebase_freq(platform_t plat, struct cpuref *cpuref)
106{
107	phandle_t phandle;
108	int32_t ticks = -1;
109
110	phandle = cpuref->cr_hwref;
111
112	OF_getprop(phandle, "timebase-frequency", &ticks, sizeof(ticks));
113
114	if (ticks <= 0)
115		panic("Unable to determine timebase frequency!");
116
117	return (ticks);
118}
119
120
121static int
122chrp_smp_fill_cpuref(struct cpuref *cpuref, phandle_t cpu)
123{
124	cell_t cpuid, res;
125
126	cpuref->cr_hwref = cpu;
127	res = OF_getprop(cpu, "reg", &cpuid, sizeof(cpuid));
128
129	/*
130	 * psim doesn't have a reg property, so assume 0 as for the
131	 * uniprocessor case in the CHRP spec.
132	 */
133	if (res < 0) {
134		cpuid = 0;
135	}
136
137	cpuref->cr_cpuid = cpuid & 0xff;
138	return (0);
139}
140
141static int
142chrp_smp_first_cpu(platform_t plat, struct cpuref *cpuref)
143{
144	char buf[8];
145	phandle_t cpu, dev, root;
146	int res;
147
148	root = OF_peer(0);
149
150	dev = OF_child(root);
151	while (dev != 0) {
152		res = OF_getprop(dev, "name", buf, sizeof(buf));
153		if (res > 0 && strcmp(buf, "cpus") == 0)
154			break;
155		dev = OF_peer(dev);
156	}
157	if (dev == 0) {
158		/*
159		 * psim doesn't have a name property on the /cpus node,
160		 * but it can be found directly
161		 */
162		dev = OF_finddevice("/cpus");
163		if (dev == 0)
164			return (ENOENT);
165	}
166
167	cpu = OF_child(dev);
168
169	while (cpu != 0) {
170		res = OF_getprop(cpu, "device_type", buf, sizeof(buf));
171		if (res > 0 && strcmp(buf, "cpu") == 0)
172			break;
173		cpu = OF_peer(cpu);
174	}
175	if (cpu == 0)
176		return (ENOENT);
177
178	return (chrp_smp_fill_cpuref(cpuref, cpu));
179}
180
181static int
182chrp_smp_next_cpu(platform_t plat, struct cpuref *cpuref)
183{
184	char buf[8];
185	phandle_t cpu;
186	int res;
187
188	cpu = OF_peer(cpuref->cr_hwref);
189	while (cpu != 0) {
190		res = OF_getprop(cpu, "device_type", buf, sizeof(buf));
191		if (res > 0 && strcmp(buf, "cpu") == 0)
192			break;
193		cpu = OF_peer(cpu);
194	}
195	if (cpu == 0)
196		return (ENOENT);
197
198	return (chrp_smp_fill_cpuref(cpuref, cpu));
199}
200
201static int
202chrp_smp_get_bsp(platform_t plat, struct cpuref *cpuref)
203{
204	ihandle_t inst;
205	phandle_t bsp, chosen;
206	int res;
207
208	chosen = OF_finddevice("/chosen");
209	if (chosen == 0)
210		return (ENXIO);
211
212	res = OF_getprop(chosen, "cpu", &inst, sizeof(inst));
213	if (res < 0)
214		return (ENXIO);
215
216	bsp = OF_instance_to_package(inst);
217	return (chrp_smp_fill_cpuref(cpuref, bsp));
218}
219
220static int
221chrp_smp_start_cpu(platform_t plat, struct pcpu *pc)
222{
223#ifdef SMP
224	phandle_t cpu;
225	volatile uint8_t *rstvec;
226	static volatile uint8_t *rstvec_virtbase = NULL;
227	int res, reset, timeout;
228
229	cpu = pc->pc_hwref;
230	res = OF_getprop(cpu, "soft-reset", &reset, sizeof(reset));
231	if (res < 0) {
232		reset = 0x58;
233
234		switch (pc->pc_cpuid) {
235		case 0:
236			reset += 0x03;
237			break;
238		case 1:
239			reset += 0x04;
240			break;
241		case 2:
242			reset += 0x0f;
243			break;
244		case 3:
245			reset += 0x10;
246			break;
247		default:
248			return (ENXIO);
249		}
250	}
251
252	ap_pcpu = pc;
253
254	if (rstvec_virtbase == NULL)
255		rstvec_virtbase = pmap_mapdev(0x80000000, PAGE_SIZE);
256
257	rstvec = rstvec_virtbase + reset;
258
259	*rstvec = 4;
260	powerpc_sync();
261	(void)(*rstvec);
262	powerpc_sync();
263	DELAY(1);
264	*rstvec = 0;
265	powerpc_sync();
266	(void)(*rstvec);
267	powerpc_sync();
268
269	timeout = 10000;
270	while (!pc->pc_awake && timeout--)
271		DELAY(100);
272
273	return ((pc->pc_awake) ? 0 : EBUSY);
274#else
275	/* No SMP support */
276	return (ENXIO);
277#endif
278}
279
280