Merge git://git.kernel.org/pub/scm/linux/kernel/git/sam/kbuild-next
[deliverable/linux.git] / arch / parisc / kernel / processor.c
1 /* $Id: processor.c,v 1.1 2002/07/20 16:27:06 rhirst Exp $
2 *
3 * Initial setup-routines for HP 9000 based hardware.
4 *
5 * Copyright (C) 1991, 1992, 1995 Linus Torvalds
6 * Modifications for PA-RISC (C) 1999 Helge Deller <deller@gmx.de>
7 * Modifications copyright 1999 SuSE GmbH (Philipp Rumpf)
8 * Modifications copyright 2000 Martin K. Petersen <mkp@mkp.net>
9 * Modifications copyright 2000 Philipp Rumpf <prumpf@tux.org>
10 * Modifications copyright 2001 Ryan Bradetich <rbradetich@uswest.net>
11 *
12 * Initial PA-RISC Version: 04-23-1999 by Helge Deller
13 *
14 * This program is free software; you can redistribute it and/or modify
15 * it under the terms of the GNU General Public License as published by
16 * the Free Software Foundation; either version 2, or (at your option)
17 * any later version.
18 *
19 * This program is distributed in the hope that it will be useful,
20 * but WITHOUT ANY WARRANTY; without even the implied warranty of
21 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
22 * GNU General Public License for more details.
23 *
24 * You should have received a copy of the GNU General Public License
25 * along with this program; if not, write to the Free Software
26 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
27 *
28 */
29 #include <linux/delay.h>
30 #include <linux/init.h>
31 #include <linux/mm.h>
32 #include <linux/module.h>
33 #include <linux/seq_file.h>
34 #include <linux/slab.h>
35 #include <linux/cpu.h>
36 #include <asm/param.h>
37 #include <asm/cache.h>
38 #include <asm/hardware.h> /* for register_parisc_driver() stuff */
39 #include <asm/processor.h>
40 #include <asm/page.h>
41 #include <asm/pdc.h>
42 #include <asm/pdcpat.h>
43 #include <asm/irq.h> /* for struct irq_region */
44 #include <asm/parisc-device.h>
45
46 struct system_cpuinfo_parisc boot_cpu_data __read_mostly;
47 EXPORT_SYMBOL(boot_cpu_data);
48
49 struct cpuinfo_parisc cpu_data[NR_CPUS] __read_mostly;
50
51 extern int update_cr16_clocksource(void); /* from time.c */
52
53 /*
54 ** PARISC CPU driver - claim "device" and initialize CPU data structures.
55 **
56 ** Consolidate per CPU initialization into (mostly) one module.
57 ** Monarch CPU will initialize boot_cpu_data which shouldn't
58 ** change once the system has booted.
59 **
60 ** The callback *should* do per-instance initialization of
61 ** everything including the monarch. "Per CPU" init code in
62 ** setup.c:start_parisc() has migrated here and start_parisc()
63 ** will call register_parisc_driver(&cpu_driver) before calling do_inventory().
64 **
65 ** The goal of consolidating CPU initialization into one place is
66 ** to make sure all CPUs get initialized the same way.
67 ** The code path not shared is how PDC hands control of the CPU to the OS.
68 ** The initialization of OS data structures is the same (done below).
69 */
70
71 /**
72 * processor_probe - Determine if processor driver should claim this device.
73 * @dev: The device which has been found.
74 *
75 * Determine if processor driver should claim this chip (return 0) or not
76 * (return 1). If so, initialize the chip and tell other partners in crime
77 * they have work to do.
78 */
79 static int __cpuinit processor_probe(struct parisc_device *dev)
80 {
81 unsigned long txn_addr;
82 unsigned long cpuid;
83 struct cpuinfo_parisc *p;
84
85 #ifdef CONFIG_SMP
86 if (num_online_cpus() >= NR_CPUS) {
87 printk(KERN_INFO "num_online_cpus() >= NR_CPUS\n");
88 return 1;
89 }
90 #else
91 if (boot_cpu_data.cpu_count > 0) {
92 printk(KERN_INFO "CONFIG_SMP=n ignoring additional CPUs\n");
93 return 1;
94 }
95 #endif
96
97 /* logical CPU ID and update global counter
98 * May get overwritten by PAT code.
99 */
100 cpuid = boot_cpu_data.cpu_count;
101 txn_addr = dev->hpa.start; /* for legacy PDC */
102
103 #ifdef CONFIG_64BIT
104 if (is_pdc_pat()) {
105 ulong status;
106 unsigned long bytecnt;
107 pdc_pat_cell_mod_maddr_block_t pa_pdc_cell;
108 #undef USE_PAT_CPUID
109 #ifdef USE_PAT_CPUID
110 struct pdc_pat_cpu_num cpu_info;
111 #endif
112
113 status = pdc_pat_cell_module(&bytecnt, dev->pcell_loc,
114 dev->mod_index, PA_VIEW, &pa_pdc_cell);
115
116 BUG_ON(PDC_OK != status);
117
118 /* verify it's the same as what do_pat_inventory() found */
119 BUG_ON(dev->mod_info != pa_pdc_cell.mod_info);
120 BUG_ON(dev->pmod_loc != pa_pdc_cell.mod_location);
121
122 txn_addr = pa_pdc_cell.mod[0]; /* id_eid for IO sapic */
123
124 #ifdef USE_PAT_CPUID
125 /* We need contiguous numbers for cpuid. Firmware's notion
126 * of cpuid is for physical CPUs and we just don't care yet.
127 * We'll care when we need to query PAT PDC about a CPU *after*
128 * boot time (ie shutdown a CPU from an OS perspective).
129 */
130 /* get the cpu number */
131 status = pdc_pat_cpu_get_number(&cpu_info, dev->hpa.start);
132
133 BUG_ON(PDC_OK != status);
134
135 if (cpu_info.cpu_num >= NR_CPUS) {
136 printk(KERN_WARNING "IGNORING CPU at 0x%x,"
137 " cpu_slot_id > NR_CPUS"
138 " (%ld > %d)\n",
139 dev->hpa.start, cpu_info.cpu_num, NR_CPUS);
140 /* Ignore CPU since it will only crash */
141 boot_cpu_data.cpu_count--;
142 return 1;
143 } else {
144 cpuid = cpu_info.cpu_num;
145 }
146 #endif
147 }
148 #endif
149
150 p = &cpu_data[cpuid];
151 boot_cpu_data.cpu_count++;
152
153 /* initialize counters - CPU 0 gets it_value set in time_init() */
154 if (cpuid)
155 memset(p, 0, sizeof(struct cpuinfo_parisc));
156
157 p->loops_per_jiffy = loops_per_jiffy;
158 p->dev = dev; /* Save IODC data in case we need it */
159 p->hpa = dev->hpa.start; /* save CPU hpa */
160 p->cpuid = cpuid; /* save CPU id */
161 p->txn_addr = txn_addr; /* save CPU IRQ address */
162 #ifdef CONFIG_SMP
163 /*
164 ** FIXME: review if any other initialization is clobbered
165 ** for boot_cpu by the above memset().
166 */
167
168 /* stolen from init_percpu_prof() */
169 cpu_data[cpuid].prof_counter = 1;
170 cpu_data[cpuid].prof_multiplier = 1;
171 #endif
172
173 /*
174 ** CONFIG_SMP: init_smp_config() will attempt to get CPUs into
175 ** OS control. RENDEZVOUS is the default state - see mem_set above.
176 ** p->state = STATE_RENDEZVOUS;
177 */
178
179 #if 0
180 /* CPU 0 IRQ table is statically allocated/initialized */
181 if (cpuid) {
182 struct irqaction actions[];
183
184 /*
185 ** itimer and ipi IRQ handlers are statically initialized in
186 ** arch/parisc/kernel/irq.c. ie Don't need to register them.
187 */
188 actions = kmalloc(sizeof(struct irqaction)*MAX_CPU_IRQ, GFP_ATOMIC);
189 if (!actions) {
190 /* not getting it's own table, share with monarch */
191 actions = cpu_irq_actions[0];
192 }
193
194 cpu_irq_actions[cpuid] = actions;
195 }
196 #endif
197
198 /*
199 * Bring this CPU up now! (ignore bootstrap cpuid == 0)
200 */
201 #ifdef CONFIG_SMP
202 if (cpuid) {
203 cpu_set(cpuid, cpu_present_map);
204 cpu_up(cpuid);
205 }
206 #endif
207
208 /* If we've registered more than one cpu,
209 * we'll use the jiffies clocksource since cr16
210 * is not synchronized between CPUs.
211 */
212 update_cr16_clocksource();
213
214 return 0;
215 }
216
217 /**
218 * collect_boot_cpu_data - Fill the boot_cpu_data structure.
219 *
220 * This function collects and stores the generic processor information
221 * in the boot_cpu_data structure.
222 */
223 void __init collect_boot_cpu_data(void)
224 {
225 memset(&boot_cpu_data, 0, sizeof(boot_cpu_data));
226
227 boot_cpu_data.cpu_hz = 100 * PAGE0->mem_10msec; /* Hz of this PARISC */
228
229 /* get CPU-Model Information... */
230 #define p ((unsigned long *)&boot_cpu_data.pdc.model)
231 if (pdc_model_info(&boot_cpu_data.pdc.model) == PDC_OK)
232 printk(KERN_INFO
233 "model %08lx %08lx %08lx %08lx %08lx %08lx %08lx %08lx %08lx\n",
234 p[0], p[1], p[2], p[3], p[4], p[5], p[6], p[7], p[8]);
235 #undef p
236
237 if (pdc_model_versions(&boot_cpu_data.pdc.versions, 0) == PDC_OK)
238 printk(KERN_INFO "vers %08lx\n",
239 boot_cpu_data.pdc.versions);
240
241 if (pdc_model_cpuid(&boot_cpu_data.pdc.cpuid) == PDC_OK)
242 printk(KERN_INFO "CPUID vers %ld rev %ld (0x%08lx)\n",
243 (boot_cpu_data.pdc.cpuid >> 5) & 127,
244 boot_cpu_data.pdc.cpuid & 31,
245 boot_cpu_data.pdc.cpuid);
246
247 if (pdc_model_capabilities(&boot_cpu_data.pdc.capabilities) == PDC_OK)
248 printk(KERN_INFO "capabilities 0x%lx\n",
249 boot_cpu_data.pdc.capabilities);
250
251 if (pdc_model_sysmodel(boot_cpu_data.pdc.sys_model_name) == PDC_OK)
252 printk(KERN_INFO "model %s\n",
253 boot_cpu_data.pdc.sys_model_name);
254
255 boot_cpu_data.hversion = boot_cpu_data.pdc.model.hversion;
256 boot_cpu_data.sversion = boot_cpu_data.pdc.model.sversion;
257
258 boot_cpu_data.cpu_type = parisc_get_cpu_type(boot_cpu_data.hversion);
259 boot_cpu_data.cpu_name = cpu_name_version[boot_cpu_data.cpu_type][0];
260 boot_cpu_data.family_name = cpu_name_version[boot_cpu_data.cpu_type][1];
261 }
262
263
264 /**
265 * init_cpu_profiler - enable/setup per cpu profiling hooks.
266 * @cpunum: The processor instance.
267 *
268 * FIXME: doesn't do much yet...
269 */
270 static inline void __init
271 init_percpu_prof(int cpunum)
272 {
273 cpu_data[cpunum].prof_counter = 1;
274 cpu_data[cpunum].prof_multiplier = 1;
275 }
276
277
278 /**
279 * init_per_cpu - Handle individual processor initializations.
280 * @cpunum: logical processor number.
281 *
282 * This function handles initialization for *every* CPU
283 * in the system:
284 *
285 * o Set "default" CPU width for trap handlers
286 *
287 * o Enable FP coprocessor
288 * REVISIT: this could be done in the "code 22" trap handler.
289 * (frowands idea - that way we know which processes need FP
290 * registers saved on the interrupt stack.)
291 * NEWS FLASH: wide kernels need FP coprocessor enabled to handle
292 * formatted printing of %lx for example (double divides I think)
293 *
294 * o Enable CPU profiling hooks.
295 */
296 int __init init_per_cpu(int cpunum)
297 {
298 int ret;
299 struct pdc_coproc_cfg coproc_cfg;
300
301 set_firmware_width();
302 ret = pdc_coproc_cfg(&coproc_cfg);
303
304 if(ret >= 0 && coproc_cfg.ccr_functional) {
305 mtctl(coproc_cfg.ccr_functional, 10); /* 10 == Coprocessor Control Reg */
306
307 /* FWIW, FP rev/model is a more accurate way to determine
308 ** CPU type. CPU rev/model has some ambiguous cases.
309 */
310 cpu_data[cpunum].fp_rev = coproc_cfg.revision;
311 cpu_data[cpunum].fp_model = coproc_cfg.model;
312
313 printk(KERN_INFO "FP[%d] enabled: Rev %ld Model %ld\n",
314 cpunum, coproc_cfg.revision, coproc_cfg.model);
315
316 /*
317 ** store status register to stack (hopefully aligned)
318 ** and clear the T-bit.
319 */
320 asm volatile ("fstd %fr0,8(%sp)");
321
322 } else {
323 printk(KERN_WARNING "WARNING: No FP CoProcessor?!"
324 " (coproc_cfg.ccr_functional == 0x%lx, expected 0xc0)\n"
325 #ifdef CONFIG_64BIT
326 "Halting Machine - FP required\n"
327 #endif
328 , coproc_cfg.ccr_functional);
329 #ifdef CONFIG_64BIT
330 mdelay(100); /* previous chars get pushed to console */
331 panic("FP CoProc not reported");
332 #endif
333 }
334
335 /* FUTURE: Enable Performance Monitor : ccr bit 0x20 */
336 init_percpu_prof(cpunum);
337
338 return ret;
339 }
340
341 /*
342 * Display CPU info for all CPUs.
343 */
344 int
345 show_cpuinfo (struct seq_file *m, void *v)
346 {
347 int n;
348
349 for(n=0; n<boot_cpu_data.cpu_count; n++) {
350 #ifdef CONFIG_SMP
351 if (0 == cpu_data[n].hpa)
352 continue;
353 #endif
354 seq_printf(m, "processor\t: %d\n"
355 "cpu family\t: PA-RISC %s\n",
356 n, boot_cpu_data.family_name);
357
358 seq_printf(m, "cpu\t\t: %s\n", boot_cpu_data.cpu_name );
359
360 /* cpu MHz */
361 seq_printf(m, "cpu MHz\t\t: %d.%06d\n",
362 boot_cpu_data.cpu_hz / 1000000,
363 boot_cpu_data.cpu_hz % 1000000 );
364
365 seq_printf(m, "model\t\t: %s\n"
366 "model name\t: %s\n",
367 boot_cpu_data.pdc.sys_model_name,
368 cpu_data[n].dev ?
369 cpu_data[n].dev->name : "Unknown" );
370
371 seq_printf(m, "hversion\t: 0x%08x\n"
372 "sversion\t: 0x%08x\n",
373 boot_cpu_data.hversion,
374 boot_cpu_data.sversion );
375
376 /* print cachesize info */
377 show_cache_info(m);
378
379 seq_printf(m, "bogomips\t: %lu.%02lu\n",
380 cpu_data[n].loops_per_jiffy / (500000 / HZ),
381 (cpu_data[n].loops_per_jiffy / (5000 / HZ)) % 100);
382
383 seq_printf(m, "software id\t: %ld\n\n",
384 boot_cpu_data.pdc.model.sw_id);
385 }
386 return 0;
387 }
388
389 static const struct parisc_device_id processor_tbl[] = {
390 { HPHW_NPROC, HVERSION_REV_ANY_ID, HVERSION_ANY_ID, SVERSION_ANY_ID },
391 { 0, }
392 };
393
394 static struct parisc_driver cpu_driver = {
395 .name = "CPU",
396 .id_table = processor_tbl,
397 .probe = processor_probe
398 };
399
400 /**
401 * processor_init - Processor initialization procedure.
402 *
403 * Register this driver.
404 */
405 void __init processor_init(void)
406 {
407 register_parisc_driver(&cpu_driver);
408 }
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