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[deliverable/linux.git] / arch / parisc / kernel / processor.c
1 /*
2 * Initial setup-routines for HP 9000 based hardware.
3 *
4 * Copyright (C) 1991, 1992, 1995 Linus Torvalds
5 * Modifications for PA-RISC (C) 1999-2008 Helge Deller <deller@gmx.de>
6 * Modifications copyright 1999 SuSE GmbH (Philipp Rumpf)
7 * Modifications copyright 2000 Martin K. Petersen <mkp@mkp.net>
8 * Modifications copyright 2000 Philipp Rumpf <prumpf@tux.org>
9 * Modifications copyright 2001 Ryan Bradetich <rbradetich@uswest.net>
10 *
11 * Initial PA-RISC Version: 04-23-1999 by Helge Deller
12 *
13 * This program is free software; you can redistribute it and/or modify
14 * it under the terms of the GNU General Public License as published by
15 * the Free Software Foundation; either version 2, or (at your option)
16 * any later version.
17 *
18 * This program is distributed in the hope that it will be useful,
19 * but WITHOUT ANY WARRANTY; without even the implied warranty of
20 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
21 * GNU General Public License for more details.
22 *
23 * You should have received a copy of the GNU General Public License
24 * along with this program; if not, write to the Free Software
25 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
26 *
27 */
28 #include <linux/delay.h>
29 #include <linux/init.h>
30 #include <linux/mm.h>
31 #include <linux/module.h>
32 #include <linux/seq_file.h>
33 #include <linux/slab.h>
34 #include <linux/cpu.h>
35 #include <asm/param.h>
36 #include <asm/cache.h>
37 #include <asm/hardware.h> /* for register_parisc_driver() stuff */
38 #include <asm/processor.h>
39 #include <asm/page.h>
40 #include <asm/pdc.h>
41 #include <asm/pdcpat.h>
42 #include <asm/irq.h> /* for struct irq_region */
43 #include <asm/parisc-device.h>
44
45 struct system_cpuinfo_parisc boot_cpu_data __read_mostly;
46 EXPORT_SYMBOL(boot_cpu_data);
47 #ifdef CONFIG_PA8X00
48 int _parisc_requires_coherency __read_mostly;
49 EXPORT_SYMBOL(_parisc_requires_coherency);
50 #endif
51
52 DEFINE_PER_CPU(struct cpuinfo_parisc, cpu_data);
53
54 /*
55 ** PARISC CPU driver - claim "device" and initialize CPU data structures.
56 **
57 ** Consolidate per CPU initialization into (mostly) one module.
58 ** Monarch CPU will initialize boot_cpu_data which shouldn't
59 ** change once the system has booted.
60 **
61 ** The callback *should* do per-instance initialization of
62 ** everything including the monarch. "Per CPU" init code in
63 ** setup.c:start_parisc() has migrated here and start_parisc()
64 ** will call register_parisc_driver(&cpu_driver) before calling do_inventory().
65 **
66 ** The goal of consolidating CPU initialization into one place is
67 ** to make sure all CPUs get initialized the same way.
68 ** The code path not shared is how PDC hands control of the CPU to the OS.
69 ** The initialization of OS data structures is the same (done below).
70 */
71
72 /**
73 * init_cpu_profiler - enable/setup per cpu profiling hooks.
74 * @cpunum: The processor instance.
75 *
76 * FIXME: doesn't do much yet...
77 */
78 static void
79 init_percpu_prof(unsigned long cpunum)
80 {
81 struct cpuinfo_parisc *p;
82
83 p = &per_cpu(cpu_data, cpunum);
84 p->prof_counter = 1;
85 p->prof_multiplier = 1;
86 }
87
88
89 /**
90 * processor_probe - Determine if processor driver should claim this device.
91 * @dev: The device which has been found.
92 *
93 * Determine if processor driver should claim this chip (return 0) or not
94 * (return 1). If so, initialize the chip and tell other partners in crime
95 * they have work to do.
96 */
97 static int processor_probe(struct parisc_device *dev)
98 {
99 unsigned long txn_addr;
100 unsigned long cpuid;
101 struct cpuinfo_parisc *p;
102
103 #ifdef CONFIG_SMP
104 if (num_online_cpus() >= nr_cpu_ids) {
105 printk(KERN_INFO "num_online_cpus() >= nr_cpu_ids\n");
106 return 1;
107 }
108 #else
109 if (boot_cpu_data.cpu_count > 0) {
110 printk(KERN_INFO "CONFIG_SMP=n ignoring additional CPUs\n");
111 return 1;
112 }
113 #endif
114
115 /* logical CPU ID and update global counter
116 * May get overwritten by PAT code.
117 */
118 cpuid = boot_cpu_data.cpu_count;
119 txn_addr = dev->hpa.start; /* for legacy PDC */
120
121 #ifdef CONFIG_64BIT
122 if (is_pdc_pat()) {
123 ulong status;
124 unsigned long bytecnt;
125 pdc_pat_cell_mod_maddr_block_t *pa_pdc_cell;
126 #undef USE_PAT_CPUID
127 #ifdef USE_PAT_CPUID
128 struct pdc_pat_cpu_num cpu_info;
129 #endif
130
131 pa_pdc_cell = kmalloc(sizeof (*pa_pdc_cell), GFP_KERNEL);
132 if (!pa_pdc_cell)
133 panic("couldn't allocate memory for PDC_PAT_CELL!");
134
135 status = pdc_pat_cell_module(&bytecnt, dev->pcell_loc,
136 dev->mod_index, PA_VIEW, pa_pdc_cell);
137
138 BUG_ON(PDC_OK != status);
139
140 /* verify it's the same as what do_pat_inventory() found */
141 BUG_ON(dev->mod_info != pa_pdc_cell->mod_info);
142 BUG_ON(dev->pmod_loc != pa_pdc_cell->mod_location);
143
144 txn_addr = pa_pdc_cell->mod[0]; /* id_eid for IO sapic */
145
146 kfree(pa_pdc_cell);
147
148 #ifdef USE_PAT_CPUID
149 /* We need contiguous numbers for cpuid. Firmware's notion
150 * of cpuid is for physical CPUs and we just don't care yet.
151 * We'll care when we need to query PAT PDC about a CPU *after*
152 * boot time (ie shutdown a CPU from an OS perspective).
153 */
154 /* get the cpu number */
155 status = pdc_pat_cpu_get_number(&cpu_info, dev->hpa.start);
156
157 BUG_ON(PDC_OK != status);
158
159 if (cpu_info.cpu_num >= NR_CPUS) {
160 printk(KERN_WARNING "IGNORING CPU at 0x%x,"
161 " cpu_slot_id > NR_CPUS"
162 " (%ld > %d)\n",
163 dev->hpa.start, cpu_info.cpu_num, NR_CPUS);
164 /* Ignore CPU since it will only crash */
165 boot_cpu_data.cpu_count--;
166 return 1;
167 } else {
168 cpuid = cpu_info.cpu_num;
169 }
170 #endif
171 }
172 #endif
173
174 p = &per_cpu(cpu_data, cpuid);
175 boot_cpu_data.cpu_count++;
176
177 /* initialize counters - CPU 0 gets it_value set in time_init() */
178 if (cpuid)
179 memset(p, 0, sizeof(struct cpuinfo_parisc));
180
181 p->loops_per_jiffy = loops_per_jiffy;
182 p->dev = dev; /* Save IODC data in case we need it */
183 p->hpa = dev->hpa.start; /* save CPU hpa */
184 p->cpuid = cpuid; /* save CPU id */
185 p->txn_addr = txn_addr; /* save CPU IRQ address */
186 #ifdef CONFIG_SMP
187 /*
188 ** FIXME: review if any other initialization is clobbered
189 ** for boot_cpu by the above memset().
190 */
191 init_percpu_prof(cpuid);
192 #endif
193
194 /*
195 ** CONFIG_SMP: init_smp_config() will attempt to get CPUs into
196 ** OS control. RENDEZVOUS is the default state - see mem_set above.
197 ** p->state = STATE_RENDEZVOUS;
198 */
199
200 #if 0
201 /* CPU 0 IRQ table is statically allocated/initialized */
202 if (cpuid) {
203 struct irqaction actions[];
204
205 /*
206 ** itimer and ipi IRQ handlers are statically initialized in
207 ** arch/parisc/kernel/irq.c. ie Don't need to register them.
208 */
209 actions = kmalloc(sizeof(struct irqaction)*MAX_CPU_IRQ, GFP_ATOMIC);
210 if (!actions) {
211 /* not getting it's own table, share with monarch */
212 actions = cpu_irq_actions[0];
213 }
214
215 cpu_irq_actions[cpuid] = actions;
216 }
217 #endif
218
219 /*
220 * Bring this CPU up now! (ignore bootstrap cpuid == 0)
221 */
222 #ifdef CONFIG_SMP
223 if (cpuid) {
224 set_cpu_present(cpuid, true);
225 cpu_up(cpuid);
226 }
227 #endif
228
229 return 0;
230 }
231
232 /**
233 * collect_boot_cpu_data - Fill the boot_cpu_data structure.
234 *
235 * This function collects and stores the generic processor information
236 * in the boot_cpu_data structure.
237 */
238 void __init collect_boot_cpu_data(void)
239 {
240 memset(&boot_cpu_data, 0, sizeof(boot_cpu_data));
241
242 boot_cpu_data.cpu_hz = 100 * PAGE0->mem_10msec; /* Hz of this PARISC */
243
244 /* get CPU-Model Information... */
245 #define p ((unsigned long *)&boot_cpu_data.pdc.model)
246 if (pdc_model_info(&boot_cpu_data.pdc.model) == PDC_OK)
247 printk(KERN_INFO
248 "model %08lx %08lx %08lx %08lx %08lx %08lx %08lx %08lx %08lx\n",
249 p[0], p[1], p[2], p[3], p[4], p[5], p[6], p[7], p[8]);
250 #undef p
251
252 if (pdc_model_versions(&boot_cpu_data.pdc.versions, 0) == PDC_OK)
253 printk(KERN_INFO "vers %08lx\n",
254 boot_cpu_data.pdc.versions);
255
256 if (pdc_model_cpuid(&boot_cpu_data.pdc.cpuid) == PDC_OK)
257 printk(KERN_INFO "CPUID vers %ld rev %ld (0x%08lx)\n",
258 (boot_cpu_data.pdc.cpuid >> 5) & 127,
259 boot_cpu_data.pdc.cpuid & 31,
260 boot_cpu_data.pdc.cpuid);
261
262 if (pdc_model_capabilities(&boot_cpu_data.pdc.capabilities) == PDC_OK)
263 printk(KERN_INFO "capabilities 0x%lx\n",
264 boot_cpu_data.pdc.capabilities);
265
266 if (pdc_model_sysmodel(boot_cpu_data.pdc.sys_model_name) == PDC_OK)
267 printk(KERN_INFO "model %s\n",
268 boot_cpu_data.pdc.sys_model_name);
269
270 boot_cpu_data.hversion = boot_cpu_data.pdc.model.hversion;
271 boot_cpu_data.sversion = boot_cpu_data.pdc.model.sversion;
272
273 boot_cpu_data.cpu_type = parisc_get_cpu_type(boot_cpu_data.hversion);
274 boot_cpu_data.cpu_name = cpu_name_version[boot_cpu_data.cpu_type][0];
275 boot_cpu_data.family_name = cpu_name_version[boot_cpu_data.cpu_type][1];
276
277 #ifdef CONFIG_PA8X00
278 _parisc_requires_coherency = (boot_cpu_data.cpu_type == mako) ||
279 (boot_cpu_data.cpu_type == mako2);
280 #endif
281 }
282
283
284 /**
285 * init_per_cpu - Handle individual processor initializations.
286 * @cpunum: logical processor number.
287 *
288 * This function handles initialization for *every* CPU
289 * in the system:
290 *
291 * o Set "default" CPU width for trap handlers
292 *
293 * o Enable FP coprocessor
294 * REVISIT: this could be done in the "code 22" trap handler.
295 * (frowands idea - that way we know which processes need FP
296 * registers saved on the interrupt stack.)
297 * NEWS FLASH: wide kernels need FP coprocessor enabled to handle
298 * formatted printing of %lx for example (double divides I think)
299 *
300 * o Enable CPU profiling hooks.
301 */
302 int init_per_cpu(int cpunum)
303 {
304 int ret;
305 struct pdc_coproc_cfg coproc_cfg;
306
307 set_firmware_width();
308 ret = pdc_coproc_cfg(&coproc_cfg);
309
310 if(ret >= 0 && coproc_cfg.ccr_functional) {
311 mtctl(coproc_cfg.ccr_functional, 10); /* 10 == Coprocessor Control Reg */
312
313 /* FWIW, FP rev/model is a more accurate way to determine
314 ** CPU type. CPU rev/model has some ambiguous cases.
315 */
316 per_cpu(cpu_data, cpunum).fp_rev = coproc_cfg.revision;
317 per_cpu(cpu_data, cpunum).fp_model = coproc_cfg.model;
318
319 if (cpunum == 0)
320 printk(KERN_INFO "FP[%d] enabled: Rev %ld Model %ld\n",
321 cpunum, coproc_cfg.revision, coproc_cfg.model);
322
323 /*
324 ** store status register to stack (hopefully aligned)
325 ** and clear the T-bit.
326 */
327 asm volatile ("fstd %fr0,8(%sp)");
328
329 } else {
330 printk(KERN_WARNING "WARNING: No FP CoProcessor?!"
331 " (coproc_cfg.ccr_functional == 0x%lx, expected 0xc0)\n"
332 #ifdef CONFIG_64BIT
333 "Halting Machine - FP required\n"
334 #endif
335 , coproc_cfg.ccr_functional);
336 #ifdef CONFIG_64BIT
337 mdelay(100); /* previous chars get pushed to console */
338 panic("FP CoProc not reported");
339 #endif
340 }
341
342 /* FUTURE: Enable Performance Monitor : ccr bit 0x20 */
343 init_percpu_prof(cpunum);
344
345 return ret;
346 }
347
348 /*
349 * Display CPU info for all CPUs.
350 */
351 int
352 show_cpuinfo (struct seq_file *m, void *v)
353 {
354 unsigned long cpu;
355
356 for_each_online_cpu(cpu) {
357 const struct cpuinfo_parisc *cpuinfo = &per_cpu(cpu_data, cpu);
358 #ifdef CONFIG_SMP
359 if (0 == cpuinfo->hpa)
360 continue;
361 #endif
362 seq_printf(m, "processor\t: %lu\n"
363 "cpu family\t: PA-RISC %s\n",
364 cpu, boot_cpu_data.family_name);
365
366 seq_printf(m, "cpu\t\t: %s\n", boot_cpu_data.cpu_name );
367
368 /* cpu MHz */
369 seq_printf(m, "cpu MHz\t\t: %d.%06d\n",
370 boot_cpu_data.cpu_hz / 1000000,
371 boot_cpu_data.cpu_hz % 1000000 );
372
373 seq_printf(m, "capabilities\t:");
374 if (boot_cpu_data.pdc.capabilities & PDC_MODEL_OS32)
375 seq_puts(m, " os32");
376 if (boot_cpu_data.pdc.capabilities & PDC_MODEL_OS64)
377 seq_puts(m, " os64");
378 if (boot_cpu_data.pdc.capabilities & PDC_MODEL_IOPDIR_FDC)
379 seq_puts(m, " iopdir_fdc");
380 switch (boot_cpu_data.pdc.capabilities & PDC_MODEL_NVA_MASK) {
381 case PDC_MODEL_NVA_SUPPORTED:
382 seq_puts(m, " nva_supported");
383 break;
384 case PDC_MODEL_NVA_SLOW:
385 seq_puts(m, " nva_slow");
386 break;
387 case PDC_MODEL_NVA_UNSUPPORTED:
388 seq_puts(m, " needs_equivalent_aliasing");
389 break;
390 }
391 seq_printf(m, " (0x%02lx)\n", boot_cpu_data.pdc.capabilities);
392
393 seq_printf(m, "model\t\t: %s\n"
394 "model name\t: %s\n",
395 boot_cpu_data.pdc.sys_model_name,
396 cpuinfo->dev ?
397 cpuinfo->dev->name : "Unknown");
398
399 seq_printf(m, "hversion\t: 0x%08x\n"
400 "sversion\t: 0x%08x\n",
401 boot_cpu_data.hversion,
402 boot_cpu_data.sversion );
403
404 /* print cachesize info */
405 show_cache_info(m);
406
407 seq_printf(m, "bogomips\t: %lu.%02lu\n",
408 cpuinfo->loops_per_jiffy / (500000 / HZ),
409 (cpuinfo->loops_per_jiffy / (5000 / HZ)) % 100);
410
411 seq_printf(m, "software id\t: %ld\n\n",
412 boot_cpu_data.pdc.model.sw_id);
413 }
414 return 0;
415 }
416
417 static const struct parisc_device_id processor_tbl[] = {
418 { HPHW_NPROC, HVERSION_REV_ANY_ID, HVERSION_ANY_ID, SVERSION_ANY_ID },
419 { 0, }
420 };
421
422 static struct parisc_driver cpu_driver = {
423 .name = "CPU",
424 .id_table = processor_tbl,
425 .probe = processor_probe
426 };
427
428 /**
429 * processor_init - Processor initialization procedure.
430 *
431 * Register this driver.
432 */
433 void __init processor_init(void)
434 {
435 register_parisc_driver(&cpu_driver);
436 }
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