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
48 DEFINE_PER_CPU(struct cpuinfo_parisc, cpu_data);
49
50 extern int update_cr16_clocksource(void); /* from time.c */
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 CPUs 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 * init_cpu_profiler - enable/setup per cpu profiling hooks.
72 * @cpunum: The processor instance.
73 *
74 * FIXME: doesn't do much yet...
75 */
76 static void __cpuinit
init_percpu_prof(unsigned long cpunum)77 init_percpu_prof(unsigned long cpunum)
78 {
79 struct cpuinfo_parisc *p;
80
81 p = &per_cpu(cpu_data, cpunum);
82 p->prof_counter = 1;
83 p->prof_multiplier = 1;
84 }
85
86
87 /**
88 * processor_probe - Determine if processor driver should claim this device.
89 * @dev: The device which has been found.
90 *
91 * Determine if processor driver should claim this chip (return 0) or not
92 * (return 1). If so, initialize the chip and tell other partners in crime
93 * they have work to do.
94 */
processor_probe(struct parisc_device * dev)95 static int __cpuinit processor_probe(struct parisc_device *dev)
96 {
97 unsigned long txn_addr;
98 unsigned long cpuid;
99 struct cpuinfo_parisc *p;
100
101 #ifdef CONFIG_SMP
102 if (num_online_cpus() >= nr_cpu_ids) {
103 printk(KERN_INFO "num_online_cpus() >= nr_cpu_ids\n");
104 return 1;
105 }
106 #else
107 if (boot_cpu_data.cpu_count > 0) {
108 printk(KERN_INFO "CONFIG_SMP=n ignoring additional CPUs\n");
109 return 1;
110 }
111 #endif
112
113 /* logical CPU ID and update global counter
114 * May get overwritten by PAT code.
115 */
116 cpuid = boot_cpu_data.cpu_count;
117 txn_addr = dev->hpa.start; /* for legacy PDC */
118
119 #ifdef CONFIG_64BIT
120 if (is_pdc_pat()) {
121 ulong status;
122 unsigned long bytecnt;
123 pdc_pat_cell_mod_maddr_block_t *pa_pdc_cell;
124 #undef USE_PAT_CPUID
125 #ifdef USE_PAT_CPUID
126 struct pdc_pat_cpu_num cpu_info;
127 #endif
128
129 pa_pdc_cell = kmalloc(sizeof (*pa_pdc_cell), GFP_KERNEL);
130 if (!pa_pdc_cell)
131 panic("couldn't allocate memory for PDC_PAT_CELL!");
132
133 status = pdc_pat_cell_module(&bytecnt, dev->pcell_loc,
134 dev->mod_index, PA_VIEW, pa_pdc_cell);
135
136 BUG_ON(PDC_OK != status);
137
138 /* verify it's the same as what do_pat_inventory() found */
139 BUG_ON(dev->mod_info != pa_pdc_cell->mod_info);
140 BUG_ON(dev->pmod_loc != pa_pdc_cell->mod_location);
141
142 txn_addr = pa_pdc_cell->mod[0]; /* id_eid for IO sapic */
143
144 kfree(pa_pdc_cell);
145
146 #ifdef USE_PAT_CPUID
147 /* We need contiguous numbers for cpuid. Firmware's notion
148 * of cpuid is for physical CPUs and we just don't care yet.
149 * We'll care when we need to query PAT PDC about a CPU *after*
150 * boot time (ie shutdown a CPU from an OS perspective).
151 */
152 /* get the cpu number */
153 status = pdc_pat_cpu_get_number(&cpu_info, dev->hpa.start);
154
155 BUG_ON(PDC_OK != status);
156
157 if (cpu_info.cpu_num >= NR_CPUS) {
158 printk(KERN_WARNING "IGNORING CPU at 0x%x,"
159 " cpu_slot_id > NR_CPUS"
160 " (%ld > %d)\n",
161 dev->hpa.start, cpu_info.cpu_num, NR_CPUS);
162 /* Ignore CPU since it will only crash */
163 boot_cpu_data.cpu_count--;
164 return 1;
165 } else {
166 cpuid = cpu_info.cpu_num;
167 }
168 #endif
169 }
170 #endif
171
172 p = &per_cpu(cpu_data, cpuid);
173 boot_cpu_data.cpu_count++;
174
175 /* initialize counters - CPU 0 gets it_value set in time_init() */
176 if (cpuid)
177 memset(p, 0, sizeof(struct cpuinfo_parisc));
178
179 p->loops_per_jiffy = loops_per_jiffy;
180 p->dev = dev; /* Save IODC data in case we need it */
181 p->hpa = dev->hpa.start; /* save CPU hpa */
182 p->cpuid = cpuid; /* save CPU id */
183 p->txn_addr = txn_addr; /* save CPU IRQ address */
184 #ifdef CONFIG_SMP
185 /*
186 ** FIXME: review if any other initialization is clobbered
187 ** for boot_cpu by the above memset().
188 */
189 init_percpu_prof(cpuid);
190 #endif
191
192 /*
193 ** CONFIG_SMP: init_smp_config() will attempt to get CPUs into
194 ** OS control. RENDEZVOUS is the default state - see mem_set above.
195 ** p->state = STATE_RENDEZVOUS;
196 */
197
198 #if 0
199 /* CPU 0 IRQ table is statically allocated/initialized */
200 if (cpuid) {
201 struct irqaction actions[];
202
203 /*
204 ** itimer and ipi IRQ handlers are statically initialized in
205 ** arch/parisc/kernel/irq.c. ie Don't need to register them.
206 */
207 actions = kmalloc(sizeof(struct irqaction)*MAX_CPU_IRQ, GFP_ATOMIC);
208 if (!actions) {
209 /* not getting it's own table, share with monarch */
210 actions = cpu_irq_actions[0];
211 }
212
213 cpu_irq_actions[cpuid] = actions;
214 }
215 #endif
216
217 /*
218 * Bring this CPU up now! (ignore bootstrap cpuid == 0)
219 */
220 #ifdef CONFIG_SMP
221 if (cpuid) {
222 set_cpu_present(cpuid, true);
223 cpu_up(cpuid);
224 }
225 #endif
226
227 /* If we've registered more than one cpu,
228 * we'll use the jiffies clocksource since cr16
229 * is not synchronized between CPUs.
230 */
231 update_cr16_clocksource();
232
233 return 0;
234 }
235
236 /**
237 * collect_boot_cpu_data - Fill the boot_cpu_data structure.
238 *
239 * This function collects and stores the generic processor information
240 * in the boot_cpu_data structure.
241 */
collect_boot_cpu_data(void)242 void __init collect_boot_cpu_data(void)
243 {
244 memset(&boot_cpu_data, 0, sizeof(boot_cpu_data));
245
246 boot_cpu_data.cpu_hz = 100 * PAGE0->mem_10msec; /* Hz of this PARISC */
247
248 /* get CPU-Model Information... */
249 #define p ((unsigned long *)&boot_cpu_data.pdc.model)
250 if (pdc_model_info(&boot_cpu_data.pdc.model) == PDC_OK)
251 printk(KERN_INFO
252 "model %08lx %08lx %08lx %08lx %08lx %08lx %08lx %08lx %08lx\n",
253 p[0], p[1], p[2], p[3], p[4], p[5], p[6], p[7], p[8]);
254 #undef p
255
256 if (pdc_model_versions(&boot_cpu_data.pdc.versions, 0) == PDC_OK)
257 printk(KERN_INFO "vers %08lx\n",
258 boot_cpu_data.pdc.versions);
259
260 if (pdc_model_cpuid(&boot_cpu_data.pdc.cpuid) == PDC_OK)
261 printk(KERN_INFO "CPUID vers %ld rev %ld (0x%08lx)\n",
262 (boot_cpu_data.pdc.cpuid >> 5) & 127,
263 boot_cpu_data.pdc.cpuid & 31,
264 boot_cpu_data.pdc.cpuid);
265
266 if (pdc_model_capabilities(&boot_cpu_data.pdc.capabilities) == PDC_OK)
267 printk(KERN_INFO "capabilities 0x%lx\n",
268 boot_cpu_data.pdc.capabilities);
269
270 if (pdc_model_sysmodel(boot_cpu_data.pdc.sys_model_name) == PDC_OK)
271 printk(KERN_INFO "model %s\n",
272 boot_cpu_data.pdc.sys_model_name);
273
274 boot_cpu_data.hversion = boot_cpu_data.pdc.model.hversion;
275 boot_cpu_data.sversion = boot_cpu_data.pdc.model.sversion;
276
277 boot_cpu_data.cpu_type = parisc_get_cpu_type(boot_cpu_data.hversion);
278 boot_cpu_data.cpu_name = cpu_name_version[boot_cpu_data.cpu_type][0];
279 boot_cpu_data.family_name = cpu_name_version[boot_cpu_data.cpu_type][1];
280 }
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 */
init_per_cpu(int cpunum)302 int __cpuinit 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 printk(KERN_INFO "FP[%d] enabled: Rev %ld Model %ld\n",
320 cpunum, coproc_cfg.revision, coproc_cfg.model);
321
322 /*
323 ** store status register to stack (hopefully aligned)
324 ** and clear the T-bit.
325 */
326 asm volatile ("fstd %fr0,8(%sp)");
327
328 } else {
329 printk(KERN_WARNING "WARNING: No FP CoProcessor?!"
330 " (coproc_cfg.ccr_functional == 0x%lx, expected 0xc0)\n"
331 #ifdef CONFIG_64BIT
332 "Halting Machine - FP required\n"
333 #endif
334 , coproc_cfg.ccr_functional);
335 #ifdef CONFIG_64BIT
336 mdelay(100); /* previous chars get pushed to console */
337 panic("FP CoProc not reported");
338 #endif
339 }
340
341 /* FUTURE: Enable Performance Monitor : ccr bit 0x20 */
342 init_percpu_prof(cpunum);
343
344 return ret;
345 }
346
347 /*
348 * Display CPU info for all CPUs.
349 */
350 int
show_cpuinfo(struct seq_file * m,void * v)351 show_cpuinfo (struct seq_file *m, void *v)
352 {
353 unsigned long cpu;
354
355 for_each_online_cpu(cpu) {
356 const struct cpuinfo_parisc *cpuinfo = &per_cpu(cpu_data, cpu);
357 #ifdef CONFIG_SMP
358 if (0 == cpuinfo->hpa)
359 continue;
360 #endif
361 seq_printf(m, "processor\t: %lu\n"
362 "cpu family\t: PA-RISC %s\n",
363 cpu, boot_cpu_data.family_name);
364
365 seq_printf(m, "cpu\t\t: %s\n", boot_cpu_data.cpu_name );
366
367 /* cpu MHz */
368 seq_printf(m, "cpu MHz\t\t: %d.%06d\n",
369 boot_cpu_data.cpu_hz / 1000000,
370 boot_cpu_data.cpu_hz % 1000000 );
371
372 seq_printf(m, "capabilities\t:");
373 if (boot_cpu_data.pdc.capabilities & PDC_MODEL_OS32)
374 seq_printf(m, " os32");
375 if (boot_cpu_data.pdc.capabilities & PDC_MODEL_OS64)
376 seq_printf(m, " os64");
377 seq_printf(m, "\n");
378
379 seq_printf(m, "model\t\t: %s\n"
380 "model name\t: %s\n",
381 boot_cpu_data.pdc.sys_model_name,
382 cpuinfo->dev ?
383 cpuinfo->dev->name : "Unknown");
384
385 seq_printf(m, "hversion\t: 0x%08x\n"
386 "sversion\t: 0x%08x\n",
387 boot_cpu_data.hversion,
388 boot_cpu_data.sversion );
389
390 /* print cachesize info */
391 show_cache_info(m);
392
393 seq_printf(m, "bogomips\t: %lu.%02lu\n",
394 cpuinfo->loops_per_jiffy / (500000 / HZ),
395 (cpuinfo->loops_per_jiffy / (5000 / HZ)) % 100);
396
397 seq_printf(m, "software id\t: %ld\n\n",
398 boot_cpu_data.pdc.model.sw_id);
399 }
400 return 0;
401 }
402
403 static const struct parisc_device_id processor_tbl[] = {
404 { HPHW_NPROC, HVERSION_REV_ANY_ID, HVERSION_ANY_ID, SVERSION_ANY_ID },
405 { 0, }
406 };
407
408 static struct parisc_driver cpu_driver = {
409 .name = "CPU",
410 .id_table = processor_tbl,
411 .probe = processor_probe
412 };
413
414 /**
415 * processor_init - Processor initialization procedure.
416 *
417 * Register this driver.
418 */
processor_init(void)419 void __init processor_init(void)
420 {
421 register_parisc_driver(&cpu_driver);
422 }
423