platform_powermac.c revision 279853 
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 279853 2015-03-10 16:01:43Z 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/altivec.h>	/* For save_vec() */
42#include <machine/bus.h>
43#include <machine/cpu.h>
44#include <machine/fpu.h>	/* For save_fpu() */
45#include <machine/hid.h>
46#include <machine/platformvar.h>
47#include <machine/pmap.h>
48#include <machine/setjmp.h>
49#include <machine/smp.h>
50#include <machine/spr.h>
51
52#include <dev/ofw/openfirm.h>
53#include <machine/ofw_machdep.h>
54
55#include "platform_if.h"
56
57extern void *ap_pcpu;
58
59static int powermac_probe(platform_t);
60static int powermac_attach(platform_t);
61void powermac_mem_regions(platform_t, struct mem_region *phys, int *physsz,
62    struct mem_region *avail, int *availsz);
63static u_long powermac_timebase_freq(platform_t, struct cpuref *cpuref);
64static int powermac_smp_first_cpu(platform_t, struct cpuref *cpuref);
65static int powermac_smp_next_cpu(platform_t, struct cpuref *cpuref);
66static int powermac_smp_get_bsp(platform_t, struct cpuref *cpuref);
67static int powermac_smp_start_cpu(platform_t, struct pcpu *cpu);
68static void powermac_reset(platform_t);
69static void powermac_sleep(platform_t);
70
71static platform_method_t powermac_methods[] = {
72	PLATFORMMETHOD(platform_probe, 		powermac_probe),
73	PLATFORMMETHOD(platform_attach,		powermac_attach),
74	PLATFORMMETHOD(platform_mem_regions,	powermac_mem_regions),
75	PLATFORMMETHOD(platform_timebase_freq,	powermac_timebase_freq),
76
77	PLATFORMMETHOD(platform_smp_first_cpu,	powermac_smp_first_cpu),
78	PLATFORMMETHOD(platform_smp_next_cpu,	powermac_smp_next_cpu),
79	PLATFORMMETHOD(platform_smp_get_bsp,	powermac_smp_get_bsp),
80	PLATFORMMETHOD(platform_smp_start_cpu,	powermac_smp_start_cpu),
81
82	PLATFORMMETHOD(platform_reset,		powermac_reset),
83	PLATFORMMETHOD(platform_sleep,		powermac_sleep),
84
85	PLATFORMMETHOD_END
86};
87
88static platform_def_t powermac_platform = {
89	"powermac",
90	powermac_methods,
91	0
92};
93
94PLATFORM_DEF(powermac_platform);
95
96static int
97powermac_probe(platform_t plat)
98{
99	char compat[255];
100	ssize_t compatlen;
101	char *curstr;
102	phandle_t root;
103
104	root = OF_peer(0);
105	if (root == 0)
106		return (ENXIO);
107
108	compatlen = OF_getprop(root, "compatible", compat, sizeof(compat));
109
110	for (curstr = compat; curstr < compat + compatlen;
111	    curstr += strlen(curstr) + 1) {
112		if (strncmp(curstr, "MacRISC", 7) == 0)
113			return (BUS_PROBE_SPECIFIC);
114	}
115
116	return (ENXIO);
117}
118
119void
120powermac_mem_regions(platform_t plat, struct mem_region *phys, int *physsz,
121    struct mem_region *avail, int *availsz)
122{
123	phandle_t memory;
124	cell_t memoryprop[PHYS_AVAIL_SZ * 2];
125	ssize_t propsize, i, j;
126	int physacells = 1;
127
128	memory = OF_finddevice("/memory");
129	if (memory == -1)
130		memory = OF_finddevice("/memory@0");
131
132	/* "reg" has variable #address-cells, but #size-cells is always 1 */
133	OF_getprop(OF_parent(memory), "#address-cells", &physacells,
134	    sizeof(physacells));
135
136	propsize = OF_getprop(memory, "reg", memoryprop, sizeof(memoryprop));
137	propsize /= sizeof(cell_t);
138	for (i = 0, j = 0; i < propsize; i += physacells+1, j++) {
139		phys[j].mr_start = memoryprop[i];
140		if (physacells == 2) {
141#ifndef __powerpc64__
142			/* On 32-bit PPC, ignore regions starting above 4 GB */
143			if (memoryprop[i] != 0) {
144				j--;
145				continue;
146			}
147#else
148			phys[j].mr_start <<= 32;
149#endif
150			phys[j].mr_start |= memoryprop[i+1];
151		}
152		phys[j].mr_size = memoryprop[i + physacells];
153	}
154	*physsz = j;
155
156	/* "available" always has #address-cells = 1 */
157	propsize = OF_getprop(memory, "available", memoryprop,
158	    sizeof(memoryprop));
159	if (propsize <= 0) {
160		for (i = 0; i < *physsz; i++) {
161			avail[i].mr_start = phys[i].mr_start;
162			avail[i].mr_size = phys[i].mr_size;
163		}
164
165		*availsz = *physsz;
166	} else {
167		propsize /= sizeof(cell_t);
168		for (i = 0, j = 0; i < propsize; i += 2, j++) {
169			avail[j].mr_start = memoryprop[i];
170			avail[j].mr_size = memoryprop[i + 1];
171		}
172
173#ifdef __powerpc64__
174		/* Add in regions above 4 GB to the available list */
175		for (i = 0; i < *physsz; i++) {
176			if (phys[i].mr_start > BUS_SPACE_MAXADDR_32BIT) {
177				avail[j].mr_start = phys[i].mr_start;
178				avail[j].mr_size = phys[i].mr_size;
179				j++;
180			}
181		}
182#endif
183		*availsz = j;
184	}
185}
186
187static int
188powermac_attach(platform_t plat)
189{
190	phandle_t rootnode;
191	char model[32];
192
193
194	/*
195	 * Quiesce Open Firmware on PowerMac11,2 and 12,1. It is
196	 * necessary there to shut down a background thread doing fan
197	 * management, and is harmful on other machines (it will make OF
198	 * shut off power to various system components it had turned on).
199	 *
200	 * Note: we don't need to worry about which OF module we are
201	 * using since this is called only from very early boot, within
202	 * OF's boot context.
203	 */
204
205	rootnode = OF_finddevice("/");
206	if (OF_getprop(rootnode, "model", model, sizeof(model)) > 0) {
207		if (strcmp(model, "PowerMac11,2") == 0 ||
208		    strcmp(model, "PowerMac12,1") == 0) {
209			ofw_quiesce();
210		}
211	}
212
213	return (0);
214}
215
216static u_long
217powermac_timebase_freq(platform_t plat, struct cpuref *cpuref)
218{
219	phandle_t phandle;
220	int32_t ticks = -1;
221
222	phandle = cpuref->cr_hwref;
223
224	OF_getprop(phandle, "timebase-frequency", &ticks, sizeof(ticks));
225
226	if (ticks <= 0)
227		panic("Unable to determine timebase frequency!");
228
229	return (ticks);
230}
231
232
233static int
234powermac_smp_fill_cpuref(struct cpuref *cpuref, phandle_t cpu)
235{
236	cell_t cpuid;
237	int res;
238
239	cpuref->cr_hwref = cpu;
240	res = OF_getprop(cpu, "reg", &cpuid, sizeof(cpuid));
241
242	/*
243	 * psim doesn't have a reg property, so assume 0 as for the
244	 * uniprocessor case in the CHRP spec.
245	 */
246	if (res < 0) {
247		cpuid = 0;
248	}
249
250	cpuref->cr_cpuid = cpuid & 0xff;
251	return (0);
252}
253
254static int
255powermac_smp_first_cpu(platform_t plat, struct cpuref *cpuref)
256{
257	char buf[8];
258	phandle_t cpu, dev, root;
259	int res;
260
261	root = OF_peer(0);
262
263	dev = OF_child(root);
264	while (dev != 0) {
265		res = OF_getprop(dev, "name", buf, sizeof(buf));
266		if (res > 0 && strcmp(buf, "cpus") == 0)
267			break;
268		dev = OF_peer(dev);
269	}
270	if (dev == 0) {
271		/*
272		 * psim doesn't have a name property on the /cpus node,
273		 * but it can be found directly
274		 */
275		dev = OF_finddevice("/cpus");
276		if (dev == -1)
277			return (ENOENT);
278	}
279
280	cpu = OF_child(dev);
281
282	while (cpu != 0) {
283		res = OF_getprop(cpu, "device_type", buf, sizeof(buf));
284		if (res > 0 && strcmp(buf, "cpu") == 0)
285			break;
286		cpu = OF_peer(cpu);
287	}
288	if (cpu == 0)
289		return (ENOENT);
290
291	return (powermac_smp_fill_cpuref(cpuref, cpu));
292}
293
294static int
295powermac_smp_next_cpu(platform_t plat, struct cpuref *cpuref)
296{
297	char buf[8];
298	phandle_t cpu;
299	int res;
300
301	cpu = OF_peer(cpuref->cr_hwref);
302	while (cpu != 0) {
303		res = OF_getprop(cpu, "device_type", buf, sizeof(buf));
304		if (res > 0 && strcmp(buf, "cpu") == 0)
305			break;
306		cpu = OF_peer(cpu);
307	}
308	if (cpu == 0)
309		return (ENOENT);
310
311	return (powermac_smp_fill_cpuref(cpuref, cpu));
312}
313
314static int
315powermac_smp_get_bsp(platform_t plat, struct cpuref *cpuref)
316{
317	ihandle_t inst;
318	phandle_t bsp, chosen;
319	int res;
320
321	chosen = OF_finddevice("/chosen");
322	if (chosen == -1)
323		return (ENXIO);
324
325	res = OF_getprop(chosen, "cpu", &inst, sizeof(inst));
326	if (res < 0)
327		return (ENXIO);
328
329	bsp = OF_instance_to_package(inst);
330	return (powermac_smp_fill_cpuref(cpuref, bsp));
331}
332
333static int
334powermac_smp_start_cpu(platform_t plat, struct pcpu *pc)
335{
336#ifdef SMP
337	phandle_t cpu;
338	volatile uint8_t *rstvec;
339	static volatile uint8_t *rstvec_virtbase = NULL;
340	int res, reset, timeout;
341
342	cpu = pc->pc_hwref;
343	res = OF_getprop(cpu, "soft-reset", &reset, sizeof(reset));
344	if (res < 0) {
345		reset = 0x58;
346
347		switch (pc->pc_cpuid) {
348		case 0:
349			reset += 0x03;
350			break;
351		case 1:
352			reset += 0x04;
353			break;
354		case 2:
355			reset += 0x0f;
356			break;
357		case 3:
358			reset += 0x10;
359			break;
360		default:
361			return (ENXIO);
362		}
363	}
364
365	ap_pcpu = pc;
366
367	if (rstvec_virtbase == NULL)
368		rstvec_virtbase = pmap_mapdev(0x80000000, PAGE_SIZE);
369
370	rstvec = rstvec_virtbase + reset;
371
372	*rstvec = 4;
373	powerpc_sync();
374	(void)(*rstvec);
375	powerpc_sync();
376	DELAY(1);
377	*rstvec = 0;
378	powerpc_sync();
379	(void)(*rstvec);
380	powerpc_sync();
381
382	timeout = 10000;
383	while (!pc->pc_awake && timeout--)
384		DELAY(100);
385
386	return ((pc->pc_awake) ? 0 : EBUSY);
387#else
388	/* No SMP support */
389	return (ENXIO);
390#endif
391}
392
393static void
394powermac_reset(platform_t platform)
395{
396	OF_reboot();
397}
398
399void
400powermac_sleep(platform_t platform)
401{
402
403	*(unsigned long *)0x80 = 0x100;
404	cpu_sleep();
405}
406
407