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[PARISC] Add __read_mostly section for parisc
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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/config.h>
30#include <linux/delay.h>
31#include <linux/init.h>
32#include <linux/mm.h>
33#include <linux/module.h>
34#include <linux/seq_file.h>
35#include <linux/slab.h>
36#include <linux/cpu.h>
37
38#include <asm/cache.h>
39#include <asm/hardware.h> /* for register_parisc_driver() stuff */
40#include <asm/processor.h>
41#include <asm/page.h>
42#include <asm/pdc.h>
43#include <asm/pdcpat.h>
44#include <asm/irq.h> /* for struct irq_region */
45#include <asm/parisc-device.h>
46
8039de10 47struct system_cpuinfo_parisc boot_cpu_data __read_mostly;
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48EXPORT_SYMBOL(boot_cpu_data);
49
8039de10 50struct cpuinfo_parisc cpu_data[NR_CPUS] __read_mostly;
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51
52/*
53** PARISC CPU driver - claim "device" and initialize CPU data structures.
54**
55** Consolidate per CPU initialization into (mostly) one module.
56** Monarch CPU will initialize boot_cpu_data which shouldn't
57** change once the system has booted.
58**
59** The callback *should* do per-instance initialization of
60** everything including the monarch. "Per CPU" init code in
61** setup.c:start_parisc() has migrated here and start_parisc()
62** will call register_parisc_driver(&cpu_driver) before calling do_inventory().
63**
64** The goal of consolidating CPU initialization into one place is
65** to make sure all CPU's get initialized the same way.
66** The code path not shared is how PDC hands control of the CPU to the OS.
67** The initialization of OS data structures is the same (done below).
68*/
69
70/**
71 * processor_probe - Determine if processor driver should claim this device.
72 * @dev: The device which has been found.
73 *
74 * Determine if processor driver should claim this chip (return 0) or not
75 * (return 1). If so, initialize the chip and tell other partners in crime
76 * they have work to do.
77 */
78static int __init processor_probe(struct parisc_device *dev)
79{
80 unsigned long txn_addr;
81 unsigned long cpuid;
82 struct cpuinfo_parisc *p;
83
84#ifndef CONFIG_SMP
85 if (boot_cpu_data.cpu_count > 0) {
86 printk(KERN_INFO "CONFIG_SMP=n ignoring additional CPUs\n");
87 return 1;
88 }
89#endif
90
91 /* logical CPU ID and update global counter
92 * May get overwritten by PAT code.
93 */
94 cpuid = boot_cpu_data.cpu_count;
53f01bba 95 txn_addr = dev->hpa.start; /* for legacy PDC */
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96
97#ifdef __LP64__
98 if (is_pdc_pat()) {
99 ulong status;
100 unsigned long bytecnt;
101 pdc_pat_cell_mod_maddr_block_t pa_pdc_cell;
102#undef USE_PAT_CPUID
103#ifdef USE_PAT_CPUID
104 struct pdc_pat_cpu_num cpu_info;
105#endif
106
107 status = pdc_pat_cell_module(&bytecnt, dev->pcell_loc,
108 dev->mod_index, PA_VIEW, &pa_pdc_cell);
109
110 BUG_ON(PDC_OK != status);
111
112 /* verify it's the same as what do_pat_inventory() found */
113 BUG_ON(dev->mod_info != pa_pdc_cell.mod_info);
114 BUG_ON(dev->pmod_loc != pa_pdc_cell.mod_location);
115
116 txn_addr = pa_pdc_cell.mod[0]; /* id_eid for IO sapic */
117
118#ifdef USE_PAT_CPUID
119/* We need contiguous numbers for cpuid. Firmware's notion
120 * of cpuid is for physical CPUs and we just don't care yet.
121 * We'll care when we need to query PAT PDC about a CPU *after*
122 * boot time (ie shutdown a CPU from an OS perspective).
123 */
124 /* get the cpu number */
53f01bba 125 status = pdc_pat_cpu_get_number(&cpu_info, dev->hpa.start);
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126
127 BUG_ON(PDC_OK != status);
128
129 if (cpu_info.cpu_num >= NR_CPUS) {
130 printk(KERN_WARNING "IGNORING CPU at 0x%x,"
131 " cpu_slot_id > NR_CPUS"
132 " (%ld > %d)\n",
53f01bba 133 dev->hpa.start, cpu_info.cpu_num, NR_CPUS);
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134 /* Ignore CPU since it will only crash */
135 boot_cpu_data.cpu_count--;
136 return 1;
137 } else {
138 cpuid = cpu_info.cpu_num;
139 }
140#endif
141 }
142#endif
143
144 p = &cpu_data[cpuid];
145 boot_cpu_data.cpu_count++;
146
147 /* initialize counters */
148 memset(p, 0, sizeof(struct cpuinfo_parisc));
149
150 p->loops_per_jiffy = loops_per_jiffy;
151 p->dev = dev; /* Save IODC data in case we need it */
53f01bba 152 p->hpa = dev->hpa.start; /* save CPU hpa */
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153 p->cpuid = cpuid; /* save CPU id */
154 p->txn_addr = txn_addr; /* save CPU IRQ address */
155#ifdef CONFIG_SMP
156 spin_lock_init(&p->lock);
157
158 /*
159 ** FIXME: review if any other initialization is clobbered
160 ** for boot_cpu by the above memset().
161 */
162
163 /* stolen from init_percpu_prof() */
164 cpu_data[cpuid].prof_counter = 1;
165 cpu_data[cpuid].prof_multiplier = 1;
166#endif
167
168 /*
169 ** CONFIG_SMP: init_smp_config() will attempt to get CPU's into
170 ** OS control. RENDEZVOUS is the default state - see mem_set above.
171 ** p->state = STATE_RENDEZVOUS;
172 */
173
174#if 0
175 /* CPU 0 IRQ table is statically allocated/initialized */
176 if (cpuid) {
177 struct irqaction actions[];
178
179 /*
180 ** itimer and ipi IRQ handlers are statically initialized in
181 ** arch/parisc/kernel/irq.c. ie Don't need to register them.
182 */
183 actions = kmalloc(sizeof(struct irqaction)*MAX_CPU_IRQ, GFP_ATOMIC);
184 if (!actions) {
185 /* not getting it's own table, share with monarch */
186 actions = cpu_irq_actions[0];
187 }
188
189 cpu_irq_actions[cpuid] = actions;
190 }
191#endif
192
193 /*
194 * Bring this CPU up now! (ignore bootstrap cpuid == 0)
195 */
196#ifdef CONFIG_SMP
197 if (cpuid) {
198 cpu_set(cpuid, cpu_present_map);
199 cpu_up(cpuid);
200 }
201#endif
202
203 return 0;
204}
205
206/**
207 * collect_boot_cpu_data - Fill the boot_cpu_data structure.
208 *
209 * This function collects and stores the generic processor information
210 * in the boot_cpu_data structure.
211 */
212void __init collect_boot_cpu_data(void)
213{
214 memset(&boot_cpu_data, 0, sizeof(boot_cpu_data));
215
216 boot_cpu_data.cpu_hz = 100 * PAGE0->mem_10msec; /* Hz of this PARISC */
217
218 /* get CPU-Model Information... */
219#define p ((unsigned long *)&boot_cpu_data.pdc.model)
220 if (pdc_model_info(&boot_cpu_data.pdc.model) == PDC_OK)
221 printk(KERN_INFO
222 "model %08lx %08lx %08lx %08lx %08lx %08lx %08lx %08lx %08lx\n",
223 p[0], p[1], p[2], p[3], p[4], p[5], p[6], p[7], p[8]);
224#undef p
225
226 if (pdc_model_versions(&boot_cpu_data.pdc.versions, 0) == PDC_OK)
227 printk(KERN_INFO "vers %08lx\n",
228 boot_cpu_data.pdc.versions);
229
230 if (pdc_model_cpuid(&boot_cpu_data.pdc.cpuid) == PDC_OK)
231 printk(KERN_INFO "CPUID vers %ld rev %ld (0x%08lx)\n",
232 (boot_cpu_data.pdc.cpuid >> 5) & 127,
233 boot_cpu_data.pdc.cpuid & 31,
234 boot_cpu_data.pdc.cpuid);
235
236 if (pdc_model_capabilities(&boot_cpu_data.pdc.capabilities) == PDC_OK)
237 printk(KERN_INFO "capabilities 0x%lx\n",
238 boot_cpu_data.pdc.capabilities);
239
240 if (pdc_model_sysmodel(boot_cpu_data.pdc.sys_model_name) == PDC_OK)
241 printk(KERN_INFO "model %s\n",
242 boot_cpu_data.pdc.sys_model_name);
243
244 boot_cpu_data.hversion = boot_cpu_data.pdc.model.hversion;
245 boot_cpu_data.sversion = boot_cpu_data.pdc.model.sversion;
246
247 boot_cpu_data.cpu_type = parisc_get_cpu_type(boot_cpu_data.hversion);
248 boot_cpu_data.cpu_name = cpu_name_version[boot_cpu_data.cpu_type][0];
249 boot_cpu_data.family_name = cpu_name_version[boot_cpu_data.cpu_type][1];
250}
251
252
253/**
254 * init_cpu_profiler - enable/setup per cpu profiling hooks.
255 * @cpunum: The processor instance.
256 *
257 * FIXME: doesn't do much yet...
258 */
259static inline void __init
260init_percpu_prof(int cpunum)
261{
262 cpu_data[cpunum].prof_counter = 1;
263 cpu_data[cpunum].prof_multiplier = 1;
264}
265
266
267/**
268 * init_per_cpu - Handle individual processor initializations.
269 * @cpunum: logical processor number.
270 *
271 * This function handles initialization for *every* CPU
272 * in the system:
273 *
274 * o Set "default" CPU width for trap handlers
275 *
276 * o Enable FP coprocessor
277 * REVISIT: this could be done in the "code 22" trap handler.
278 * (frowands idea - that way we know which processes need FP
279 * registers saved on the interrupt stack.)
280 * NEWS FLASH: wide kernels need FP coprocessor enabled to handle
281 * formatted printing of %lx for example (double divides I think)
282 *
283 * o Enable CPU profiling hooks.
284 */
285int __init init_per_cpu(int cpunum)
286{
287 int ret;
288 struct pdc_coproc_cfg coproc_cfg;
289
290 set_firmware_width();
291 ret = pdc_coproc_cfg(&coproc_cfg);
292
293 if(ret >= 0 && coproc_cfg.ccr_functional) {
294 mtctl(coproc_cfg.ccr_functional, 10); /* 10 == Coprocessor Control Reg */
295
296 /* FWIW, FP rev/model is a more accurate way to determine
297 ** CPU type. CPU rev/model has some ambiguous cases.
298 */
299 cpu_data[cpunum].fp_rev = coproc_cfg.revision;
300 cpu_data[cpunum].fp_model = coproc_cfg.model;
301
302 printk(KERN_INFO "FP[%d] enabled: Rev %ld Model %ld\n",
303 cpunum, coproc_cfg.revision, coproc_cfg.model);
304
305 /*
306 ** store status register to stack (hopefully aligned)
307 ** and clear the T-bit.
308 */
309 asm volatile ("fstd %fr0,8(%sp)");
310
311 } else {
312 printk(KERN_WARNING "WARNING: No FP CoProcessor?!"
313 " (coproc_cfg.ccr_functional == 0x%lx, expected 0xc0)\n"
314#ifdef __LP64__
315 "Halting Machine - FP required\n"
316#endif
317 , coproc_cfg.ccr_functional);
318#ifdef __LP64__
319 mdelay(100); /* previous chars get pushed to console */
320 panic("FP CoProc not reported");
321#endif
322 }
323
324 /* FUTURE: Enable Performance Monitor : ccr bit 0x20 */
325 init_percpu_prof(cpunum);
326
327 return ret;
328}
329
330/*
331 * Display cpu info for all cpu's.
332 */
333int
334show_cpuinfo (struct seq_file *m, void *v)
335{
336 int n;
337
338 for(n=0; n<boot_cpu_data.cpu_count; n++) {
339#ifdef CONFIG_SMP
340 if (0 == cpu_data[n].hpa)
341 continue;
342#ifdef ENTRY_SYS_CPUS
343#error iCOD support wants to show CPU state here
344#endif
345#endif
346 seq_printf(m, "processor\t: %d\n"
347 "cpu family\t: PA-RISC %s\n",
348 n, boot_cpu_data.family_name);
349
350 seq_printf(m, "cpu\t\t: %s\n", boot_cpu_data.cpu_name );
351
352 /* cpu MHz */
353 seq_printf(m, "cpu MHz\t\t: %d.%06d\n",
354 boot_cpu_data.cpu_hz / 1000000,
355 boot_cpu_data.cpu_hz % 1000000 );
356
357 seq_printf(m, "model\t\t: %s\n"
358 "model name\t: %s\n",
359 boot_cpu_data.pdc.sys_model_name,
360 cpu_data[n].dev ?
361 cpu_data[n].dev->name : "Unknown" );
362
363 seq_printf(m, "hversion\t: 0x%08x\n"
364 "sversion\t: 0x%08x\n",
365 boot_cpu_data.hversion,
366 boot_cpu_data.sversion );
367
368 /* print cachesize info */
369 show_cache_info(m);
370
371 seq_printf(m, "bogomips\t: %lu.%02lu\n",
372 cpu_data[n].loops_per_jiffy / (500000 / HZ),
373 (cpu_data[n].loops_per_jiffy / (5000 / HZ)) % 100);
374
375 seq_printf(m, "software id\t: %ld\n\n",
376 boot_cpu_data.pdc.model.sw_id);
377 }
378 return 0;
379}
380
8039de10 381static struct parisc_device_id processor_tbl[] __read_mostly = {
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382 { HPHW_NPROC, HVERSION_REV_ANY_ID, HVERSION_ANY_ID, SVERSION_ANY_ID },
383 { 0, }
384};
385
8039de10 386static struct parisc_driver cpu_driver __read_mostly = {
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387 .name = "CPU",
388 .id_table = processor_tbl,
389 .probe = processor_probe
390};
391
392/**
393 * processor_init - Processor initalization procedure.
394 *
395 * Register this driver.
396 */
397void __init processor_init(void)
398{
399 register_parisc_driver(&cpu_driver);
400}