platform_powermac.c revision 259082 
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 259082 2013-12-07 22:25:07Z jhibbits $");
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);
59static int powermac_attach(platform_t);
60void powermac_mem_regions(platform_t, struct mem_region *phys, int *physsz,
61    struct mem_region *avail, int *availsz);
62static u_long powermac_timebase_freq(platform_t, struct cpuref *cpuref);
63static int powermac_smp_first_cpu(platform_t, struct cpuref *cpuref);
64static int powermac_smp_next_cpu(platform_t, struct cpuref *cpuref);
65static int powermac_smp_get_bsp(platform_t, struct cpuref *cpuref);
66static int powermac_smp_start_cpu(platform_t, struct pcpu *cpu);
67static void powermac_reset(platform_t);
68
69static platform_method_t powermac_methods[] = {
70	PLATFORMMETHOD(platform_probe, 		powermac_probe),
71	PLATFORMMETHOD(platform_attach,		powermac_attach),
72	PLATFORMMETHOD(platform_mem_regions,	powermac_mem_regions),
73	PLATFORMMETHOD(platform_timebase_freq,	powermac_timebase_freq),
74
75	PLATFORMMETHOD(platform_smp_first_cpu,	powermac_smp_first_cpu),
76	PLATFORMMETHOD(platform_smp_next_cpu,	powermac_smp_next_cpu),
77	PLATFORMMETHOD(platform_smp_get_bsp,	powermac_smp_get_bsp),
78	PLATFORMMETHOD(platform_smp_start_cpu,	powermac_smp_start_cpu),
79
80	PLATFORMMETHOD(platform_reset,		powermac_reset),
81
82	PLATFORMMETHOD_END
83};
84
85static platform_def_t powermac_platform = {
86	"powermac",
87	powermac_methods,
88	0
89};
90
91PLATFORM_DEF(powermac_platform);
92
93static int
94powermac_probe(platform_t plat)
95{
96	char compat[255];
97	ssize_t compatlen;
98	char *curstr;
99	phandle_t root;
100
101	root = OF_peer(0);
102	if (root == 0)
103		return (ENXIO);
104
105	compatlen = OF_getprop(root, "compatible", compat, sizeof(compat));
106
107	for (curstr = compat; curstr < compat + compatlen;
108	    curstr += strlen(curstr) + 1) {
109		if (strncmp(curstr, "MacRISC", 7) == 0)
110			return (BUS_PROBE_SPECIFIC);
111	}
112
113	return (ENXIO);
114}
115
116void
117powermac_mem_regions(platform_t plat, struct mem_region *phys, int *physsz,
118    struct mem_region *avail, int *availsz)
119{
120	phandle_t memory;
121	cell_t memoryprop[PHYS_AVAIL_SZ * 2];
122	ssize_t propsize, i, j;
123	int physacells = 1;
124
125	memory = OF_finddevice("/memory");
126
127	/* "reg" has variable #address-cells, but #size-cells is always 1 */
128	OF_getprop(OF_parent(memory), "#address-cells", &physacells,
129	    sizeof(physacells));
130
131	propsize = OF_getprop(memory, "reg", memoryprop, sizeof(memoryprop));
132	propsize /= sizeof(cell_t);
133	for (i = 0, j = 0; i < propsize; i += physacells+1, j++) {
134		phys[j].mr_start = memoryprop[i];
135		if (physacells == 2) {
136#ifndef __powerpc64__
137			/* On 32-bit PPC, ignore regions starting above 4 GB */
138			if (memoryprop[i] != 0) {
139				j--;
140				continue;
141			}
142#else
143			phys[j].mr_start <<= 32;
144#endif
145			phys[j].mr_start |= memoryprop[i+1];
146		}
147		phys[j].mr_size = memoryprop[i + physacells];
148	}
149	*physsz = j;
150
151	/* "available" always has #address-cells = 1 */
152	propsize = OF_getprop(memory, "available", memoryprop,
153	    sizeof(memoryprop));
154	propsize /= sizeof(cell_t);
155	for (i = 0, j = 0; i < propsize; i += 2, j++) {
156		avail[j].mr_start = memoryprop[i];
157		avail[j].mr_size = memoryprop[i + 1];
158	}
159
160#ifdef __powerpc64__
161	/* Add in regions above 4 GB to the available list */
162	for (i = 0; i < *physsz; i++) {
163		if (phys[i].mr_start > BUS_SPACE_MAXADDR_32BIT) {
164			avail[j].mr_start = phys[i].mr_start;
165			avail[j].mr_size = phys[i].mr_size;
166			j++;
167		}
168	}
169#endif
170	*availsz = j;
171}
172
173static int
174powermac_attach(platform_t plat)
175{
176	phandle_t rootnode;
177	char model[32];
178
179
180	/*
181	 * Quiesce Open Firmware on PowerMac11,2 and 12,1. It is
182	 * necessary there to shut down a background thread doing fan
183	 * management, and is harmful on other machines (it will make OF
184	 * shut off power to various system components it had turned on).
185	 *
186	 * Note: we don't need to worry about which OF module we are
187	 * using since this is called only from very early boot, within
188	 * OF's boot context.
189	 */
190
191	rootnode = OF_finddevice("/");
192	if (OF_getprop(rootnode, "model", model, sizeof(model)) > 0) {
193		if (strcmp(model, "PowerMac11,2") == 0 ||
194		    strcmp(model, "PowerMac12,1") == 0) {
195			ofw_quiesce();
196		}
197	}
198
199	return (0);
200}
201
202static u_long
203powermac_timebase_freq(platform_t plat, struct cpuref *cpuref)
204{
205	phandle_t phandle;
206	int32_t ticks = -1;
207
208	phandle = cpuref->cr_hwref;
209
210	OF_getprop(phandle, "timebase-frequency", &ticks, sizeof(ticks));
211
212	if (ticks <= 0)
213		panic("Unable to determine timebase frequency!");
214
215	return (ticks);
216}
217
218
219static int
220powermac_smp_fill_cpuref(struct cpuref *cpuref, phandle_t cpu)
221{
222	cell_t cpuid;
223	int res;
224
225	cpuref->cr_hwref = cpu;
226	res = OF_getprop(cpu, "reg", &cpuid, sizeof(cpuid));
227
228	/*
229	 * psim doesn't have a reg property, so assume 0 as for the
230	 * uniprocessor case in the CHRP spec.
231	 */
232	if (res < 0) {
233		cpuid = 0;
234	}
235
236	cpuref->cr_cpuid = cpuid & 0xff;
237	return (0);
238}
239
240static int
241powermac_smp_first_cpu(platform_t plat, struct cpuref *cpuref)
242{
243	char buf[8];
244	phandle_t cpu, dev, root;
245	int res;
246
247	root = OF_peer(0);
248
249	dev = OF_child(root);
250	while (dev != 0) {
251		res = OF_getprop(dev, "name", buf, sizeof(buf));
252		if (res > 0 && strcmp(buf, "cpus") == 0)
253			break;
254		dev = OF_peer(dev);
255	}
256	if (dev == 0) {
257		/*
258		 * psim doesn't have a name property on the /cpus node,
259		 * but it can be found directly
260		 */
261		dev = OF_finddevice("/cpus");
262		if (dev == -1)
263			return (ENOENT);
264	}
265
266	cpu = OF_child(dev);
267
268	while (cpu != 0) {
269		res = OF_getprop(cpu, "device_type", buf, sizeof(buf));
270		if (res > 0 && strcmp(buf, "cpu") == 0)
271			break;
272		cpu = OF_peer(cpu);
273	}
274	if (cpu == 0)
275		return (ENOENT);
276
277	return (powermac_smp_fill_cpuref(cpuref, cpu));
278}
279
280static int
281powermac_smp_next_cpu(platform_t plat, struct cpuref *cpuref)
282{
283	char buf[8];
284	phandle_t cpu;
285	int res;
286
287	cpu = OF_peer(cpuref->cr_hwref);
288	while (cpu != 0) {
289		res = OF_getprop(cpu, "device_type", buf, sizeof(buf));
290		if (res > 0 && strcmp(buf, "cpu") == 0)
291			break;
292		cpu = OF_peer(cpu);
293	}
294	if (cpu == 0)
295		return (ENOENT);
296
297	return (powermac_smp_fill_cpuref(cpuref, cpu));
298}
299
300static int
301powermac_smp_get_bsp(platform_t plat, struct cpuref *cpuref)
302{
303	ihandle_t inst;
304	phandle_t bsp, chosen;
305	int res;
306
307	chosen = OF_finddevice("/chosen");
308	if (chosen == -1)
309		return (ENXIO);
310
311	res = OF_getprop(chosen, "cpu", &inst, sizeof(inst));
312	if (res < 0)
313		return (ENXIO);
314
315	bsp = OF_instance_to_package(inst);
316	return (powermac_smp_fill_cpuref(cpuref, bsp));
317}
318
319static int
320powermac_smp_start_cpu(platform_t plat, struct pcpu *pc)
321{
322#ifdef SMP
323	phandle_t cpu;
324	volatile uint8_t *rstvec;
325	static volatile uint8_t *rstvec_virtbase = NULL;
326	int res, reset, timeout;
327
328	cpu = pc->pc_hwref;
329	res = OF_getprop(cpu, "soft-reset", &reset, sizeof(reset));
330	if (res < 0) {
331		reset = 0x58;
332
333		switch (pc->pc_cpuid) {
334		case 0:
335			reset += 0x03;
336			break;
337		case 1:
338			reset += 0x04;
339			break;
340		case 2:
341			reset += 0x0f;
342			break;
343		case 3:
344			reset += 0x10;
345			break;
346		default:
347			return (ENXIO);
348		}
349	}
350
351	ap_pcpu = pc;
352
353	if (rstvec_virtbase == NULL)
354		rstvec_virtbase = pmap_mapdev(0x80000000, PAGE_SIZE);
355
356	rstvec = rstvec_virtbase + reset;
357
358	*rstvec = 4;
359	powerpc_sync();
360	(void)(*rstvec);
361	powerpc_sync();
362	DELAY(1);
363	*rstvec = 0;
364	powerpc_sync();
365	(void)(*rstvec);
366	powerpc_sync();
367
368	timeout = 10000;
369	while (!pc->pc_awake && timeout--)
370		DELAY(100);
371
372	return ((pc->pc_awake) ? 0 : EBUSY);
373#else
374	/* No SMP support */
375	return (ENXIO);
376#endif
377}
378
379static void
380powermac_reset(platform_t platform)
381{
382	OF_reboot();
383}
384
385