platform_powermac.c revision 246732 
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/powermac/platform_powermac.c 246732 2013-02-13 02:21:45Z rpaulo $");
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 powermac_probe(platform_t);
59void powermac_mem_regions(platform_t, struct mem_region **phys, int *physsz,
60    struct mem_region **avail, int *availsz);
61static u_long powermac_timebase_freq(platform_t, struct cpuref *cpuref);
62static int powermac_smp_first_cpu(platform_t, struct cpuref *cpuref);
63static int powermac_smp_next_cpu(platform_t, struct cpuref *cpuref);
64static int powermac_smp_get_bsp(platform_t, struct cpuref *cpuref);
65static int powermac_smp_start_cpu(platform_t, struct pcpu *cpu);
66static void powermac_reset(platform_t);
67
68static 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	PLATFORMMETHOD_END
81};
82
83static platform_def_t powermac_platform = {
84	"powermac",
85	powermac_methods,
86	0
87};
88
89PLATFORM_DEF(powermac_platform);
90
91static int
92powermac_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
100void
101powermac_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
107static u_long
108powermac_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
124static int
125powermac_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
144static int
145powermac_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 == -1)
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
184static int
185powermac_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
204static int
205powermac_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 == -1)
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
223static int
224powermac_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
283static void
284powermac_reset(platform_t platform)
285{
286	OF_reboot();
287}
288
289