summaryrefslogtreecommitdiffstats
path: root/arch/parisc/kernel/processor.c
blob: dd5d0cb6b347365e117aa13575b19d7107ba0324 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
/*    $Id: processor.c,v 1.1 2002/07/20 16:27:06 rhirst Exp $
 *
 *    Initial setup-routines for HP 9000 based hardware.
 *
 *    Copyright (C) 1991, 1992, 1995  Linus Torvalds
 *    Modifications for PA-RISC (C) 1999 Helge Deller <deller@gmx.de>
 *    Modifications copyright 1999 SuSE GmbH (Philipp Rumpf)
 *    Modifications copyright 2000 Martin K. Petersen <mkp@mkp.net>
 *    Modifications copyright 2000 Philipp Rumpf <prumpf@tux.org>
 *    Modifications copyright 2001 Ryan Bradetich <rbradetich@uswest.net>
 *
 *    Initial PA-RISC Version: 04-23-1999 by Helge Deller
 *
 *    This program is free software; you can redistribute it and/or modify
 *    it under the terms of the GNU General Public License as published by
 *    the Free Software Foundation; either version 2, or (at your option)
 *    any later version.
 *
 *    This program is distributed in the hope that it will be useful,
 *    but WITHOUT ANY WARRANTY; without even the implied warranty of
 *    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *    GNU General Public License for more details.
 *
 *    You should have received a copy of the GNU General Public License
 *    along with this program; if not, write to the Free Software
 *    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 *
 */
#include <linux/delay.h>
#include <linux/init.h>
#include <linux/mm.h>
#include <linux/module.h>
#include <linux/seq_file.h>
#include <linux/slab.h>
#include <linux/cpu.h>

#include <asm/cache.h>
#include <asm/hardware.h>	/* for register_parisc_driver() stuff */
#include <asm/processor.h>
#include <asm/page.h>
#include <asm/pdc.h>
#include <asm/pdcpat.h>
#include <asm/irq.h>		/* for struct irq_region */
#include <asm/parisc-device.h>

struct system_cpuinfo_parisc boot_cpu_data __read_mostly;
EXPORT_SYMBOL(boot_cpu_data);

struct cpuinfo_parisc cpu_data[NR_CPUS] __read_mostly;

extern int update_cr16_clocksource(void);	/* from time.c */

/*
**  	PARISC CPU driver - claim "device" and initialize CPU data structures.
**
** Consolidate per CPU initialization into (mostly) one module.
** Monarch CPU will initialize boot_cpu_data which shouldn't
** change once the system has booted.
**
** The callback *should* do per-instance initialization of
** everything including the monarch. "Per CPU" init code in
** setup.c:start_parisc() has migrated here and start_parisc()
** will call register_parisc_driver(&cpu_driver) before calling do_inventory().
**
** The goal of consolidating CPU initialization into one place is
** to make sure all CPU's get initialized the same way.
** The code path not shared is how PDC hands control of the CPU to the OS.
** The initialization of OS data structures is the same (done below).
*/

/**
 * processor_probe - Determine if processor driver should claim this device.
 * @dev: The device which has been found.
 *
 * Determine if processor driver should claim this chip (return 0) or not 
 * (return 1).  If so, initialize the chip and tell other partners in crime 
 * they have work to do.
 */
static int __init processor_probe(struct parisc_device *dev)
{
	unsigned long txn_addr;
	unsigned long cpuid;
	struct cpuinfo_parisc *p;

#ifndef CONFIG_SMP
	if (boot_cpu_data.cpu_count > 0) {
		printk(KERN_INFO "CONFIG_SMP=n  ignoring additional CPUs\n");
		return 1;
	}
#endif

	/* logical CPU ID and update global counter
	 * May get overwritten by PAT code.
	 */
	cpuid = boot_cpu_data.cpu_count;
	txn_addr = dev->hpa.start;	/* for legacy PDC */

#ifdef CONFIG_64BIT
	if (is_pdc_pat()) {
		ulong status;
		unsigned long bytecnt;
	        pdc_pat_cell_mod_maddr_block_t pa_pdc_cell;
#undef USE_PAT_CPUID
#ifdef USE_PAT_CPUID
		struct pdc_pat_cpu_num cpu_info;
#endif

		status = pdc_pat_cell_module(&bytecnt, dev->pcell_loc,
			dev->mod_index, PA_VIEW, &pa_pdc_cell);

		BUG_ON(PDC_OK != status);

		/* verify it's the same as what do_pat_inventory() found */
		BUG_ON(dev->mod_info != pa_pdc_cell.mod_info);
		BUG_ON(dev->pmod_loc != pa_pdc_cell.mod_location);

		txn_addr = pa_pdc_cell.mod[0];   /* id_eid for IO sapic */

#ifdef USE_PAT_CPUID
/* We need contiguous numbers for cpuid. Firmware's notion
 * of cpuid is for physical CPUs and we just don't care yet.
 * We'll care when we need to query PAT PDC about a CPU *after*
 * boot time (ie shutdown a CPU from an OS perspective).
 */
		/* get the cpu number */
		status = pdc_pat_cpu_get_number(&cpu_info, dev->hpa.start);

		BUG_ON(PDC_OK != status);

		if (cpu_info.cpu_num >= NR_CPUS) {
			printk(KERN_WARNING "IGNORING CPU at 0x%x,"
				" cpu_slot_id > NR_CPUS"
				" (%ld > %d)\n",
				dev->hpa.start, cpu_info.cpu_num, NR_CPUS);
			/* Ignore CPU since it will only crash */
			boot_cpu_data.cpu_count--;
			return 1;
		} else {
			cpuid = cpu_info.cpu_num;
		}
#endif
	}
#endif

	p = &cpu_data[cpuid];
	boot_cpu_data.cpu_count++;

	/* initialize counters - CPU 0 gets it_value set in time_init() */
	if (cpuid)
		memset(p, 0, sizeof(struct cpuinfo_parisc));

	p->loops_per_jiffy = loops_per_jiffy;
	p->dev = dev;		/* Save IODC data in case we need it */
	p->hpa = dev->hpa.start;	/* save CPU hpa */
	p->cpuid = cpuid;	/* save CPU id */
	p->txn_addr = txn_addr;	/* save CPU IRQ address */
#ifdef CONFIG_SMP
	/*
	** FIXME: review if any other initialization is clobbered
	**	for boot_cpu by the above memset().
	*/

	/* stolen from init_percpu_prof() */
	cpu_data[cpuid].prof_counter = 1;
	cpu_data[cpuid].prof_multiplier = 1;
#endif

	/*
	** CONFIG_SMP: init_smp_config() will attempt to get CPU's into
	** OS control. RENDEZVOUS is the default state - see mem_set above.
	**	p->state = STATE_RENDEZVOUS;
	*/

#if 0
	/* CPU 0 IRQ table is statically allocated/initialized */
	if (cpuid) {
		struct irqaction actions[];

		/*
		** itimer and ipi IRQ handlers are statically initialized in
		** arch/parisc/kernel/irq.c. ie Don't need to register them.
		*/
		actions = kmalloc(sizeof(struct irqaction)*MAX_CPU_IRQ, GFP_ATOMIC);
		if (!actions) {
			/* not getting it's own table, share with monarch */
			actions = cpu_irq_actions[0];
		}

		cpu_irq_actions[cpuid] = actions;
	}
#endif

	/* 
	 * Bring this CPU up now! (ignore bootstrap cpuid == 0)
	 */
#ifdef CONFIG_SMP
	if (cpuid) {
		cpu_set(cpuid, cpu_present_map);
		cpu_up(cpuid);
	}
#endif

	/* If we've registered more than one cpu,
	 * we'll use the jiffies clocksource since cr16
	 * is not synchronized between CPUs.
	 */
	update_cr16_clocksource();

	return 0;
}

/**
 * collect_boot_cpu_data - Fill the boot_cpu_data structure.
 *
 * This function collects and stores the generic processor information
 * in the boot_cpu_data structure.
 */
void __init collect_boot_cpu_data(void)
{
	memset(&boot_cpu_data, 0, sizeof(boot_cpu_data));

	boot_cpu_data.cpu_hz = 100 * PAGE0->mem_10msec; /* Hz of this PARISC */

	/* get CPU-Model Information... */
#define p ((unsigned long *)&boot_cpu_data.pdc.model)
	if (pdc_model_info(&boot_cpu_data.pdc.model) == PDC_OK)
		printk(KERN_INFO 
			"model %08lx %08lx %08lx %08lx %08lx %08lx %08lx %08lx %08lx\n",
			p[0], p[1], p[2], p[3], p[4], p[5], p[6], p[7], p[8]);
#undef p

	if (pdc_model_versions(&boot_cpu_data.pdc.versions, 0) == PDC_OK)
		printk(KERN_INFO "vers  %08lx\n", 
			boot_cpu_data.pdc.versions);

	if (pdc_model_cpuid(&boot_cpu_data.pdc.cpuid) == PDC_OK)
		printk(KERN_INFO "CPUID vers %ld rev %ld (0x%08lx)\n",
			(boot_cpu_data.pdc.cpuid >> 5) & 127,
			boot_cpu_data.pdc.cpuid & 31,
			boot_cpu_data.pdc.cpuid);

	if (pdc_model_capabilities(&boot_cpu_data.pdc.capabilities) == PDC_OK)
		printk(KERN_INFO "capabilities 0x%lx\n",
			boot_cpu_data.pdc.capabilities);

	if (pdc_model_sysmodel(boot_cpu_data.pdc.sys_model_name) == PDC_OK)
		printk(KERN_INFO "model %s\n",
			boot_cpu_data.pdc.sys_model_name);

	boot_cpu_data.hversion =  boot_cpu_data.pdc.model.hversion;
	boot_cpu_data.sversion =  boot_cpu_data.pdc.model.sversion;

	boot_cpu_data.cpu_type = parisc_get_cpu_type(boot_cpu_data.hversion);
	boot_cpu_data.cpu_name = cpu_name_version[boot_cpu_data.cpu_type][0];
	boot_cpu_data.family_name = cpu_name_version[boot_cpu_data.cpu_type][1];
}


/**
 * init_cpu_profiler - enable/setup per cpu profiling hooks.
 * @cpunum: The processor instance.
 *
 * FIXME: doesn't do much yet...
 */
static inline void __init
init_percpu_prof(int cpunum)
{
	cpu_data[cpunum].prof_counter = 1;
	cpu_data[cpunum].prof_multiplier = 1;
}


/**
 * init_per_cpu - Handle individual processor initializations.
 * @cpunum: logical processor number.
 *
 * This function handles initialization for *every* CPU
 * in the system:
 *
 * o Set "default" CPU width for trap handlers
 *
 * o Enable FP coprocessor
 *   REVISIT: this could be done in the "code 22" trap handler.
 *	(frowands idea - that way we know which processes need FP
 *	registers saved on the interrupt stack.)
 *   NEWS FLASH: wide kernels need FP coprocessor enabled to handle
 *	formatted printing of %lx for example (double divides I think)
 *
 * o Enable CPU profiling hooks.
 */
int __init init_per_cpu(int cpunum)
{
	int ret;
	struct pdc_coproc_cfg coproc_cfg;

	set_firmware_width();
	ret = pdc_coproc_cfg(&coproc_cfg);

	if(ret >= 0 && coproc_cfg.ccr_functional) {
		mtctl(coproc_cfg.ccr_functional, 10);  /* 10 == Coprocessor Control Reg */

		/* FWIW, FP rev/model is a more accurate way to determine
		** CPU type. CPU rev/model has some ambiguous cases.
		*/
		cpu_data[cpunum].fp_rev = coproc_cfg.revision;
		cpu_data[cpunum].fp_model = coproc_cfg.model;

		printk(KERN_INFO  "FP[%d] enabled: Rev %ld Model %ld\n",
			cpunum, coproc_cfg.revision, coproc_cfg.model);

		/*
		** store status register to stack (hopefully aligned)
		** and clear the T-bit.
		*/
		asm volatile ("fstd    %fr0,8(%sp)");

	} else {
		printk(KERN_WARNING  "WARNING: No FP CoProcessor?!"
			" (coproc_cfg.ccr_functional == 0x%lx, expected 0xc0)\n"
#ifdef CONFIG_64BIT
			"Halting Machine - FP required\n"
#endif
			, coproc_cfg.ccr_functional);
#ifdef CONFIG_64BIT
		mdelay(100);	/* previous chars get pushed to console */
		panic("FP CoProc not reported");
#endif
	}

	/* FUTURE: Enable Performance Monitor : ccr bit 0x20 */
	init_percpu_prof(cpunum);

	return ret;
}

/*
 * Display cpu info for all cpu's.
 */
int
show_cpuinfo (struct seq_file *m, void *v)
{
	int	n;

	for(n=0; n<boot_cpu_data.cpu_count; n++) {
#ifdef CONFIG_SMP
		if (0 == cpu_data[n].hpa)
			continue;
#endif
		seq_printf(m, "processor\t: %d\n"
				"cpu family\t: PA-RISC %s\n",
				 n, boot_cpu_data.family_name);

		seq_printf(m, "cpu\t\t: %s\n",  boot_cpu_data.cpu_name );

		/* cpu MHz */
		seq_printf(m, "cpu MHz\t\t: %d.%06d\n",
				 boot_cpu_data.cpu_hz / 1000000,
				 boot_cpu_data.cpu_hz % 1000000  );

		seq_printf(m, "model\t\t: %s\n"
				"model name\t: %s\n",
				 boot_cpu_data.pdc.sys_model_name,
				 cpu_data[n].dev ? 
				 cpu_data[n].dev->name : "Unknown" );

		seq_printf(m, "hversion\t: 0x%08x\n"
			        "sversion\t: 0x%08x\n",
				 boot_cpu_data.hversion,
				 boot_cpu_data.sversion );

		/* print cachesize info */
		show_cache_info(m);

		seq_printf(m, "bogomips\t: %lu.%02lu\n",
			     cpu_data[n].loops_per_jiffy / (500000 / HZ),
			     (cpu_data[n].loops_per_jiffy / (5000 / HZ)) % 100);

		seq_printf(m, "software id\t: %ld\n\n",
				boot_cpu_data.pdc.model.sw_id);
	}
	return 0;
}

static struct parisc_device_id processor_tbl[] __read_mostly = {
	{ HPHW_NPROC, HVERSION_REV_ANY_ID, HVERSION_ANY_ID, SVERSION_ANY_ID },
	{ 0, }
};

static struct parisc_driver cpu_driver __read_mostly = {
	.name		= "CPU",
	.id_table	= processor_tbl,
	.probe		= processor_probe
};

/**
 * processor_init - Processor initalization procedure.
 *
 * Register this driver.
 */
void __init processor_init(void)
{
	register_parisc_driver(&cpu_driver);
}