1 /* $Id: processor.c,v 1.14 2002/09/13 06:46:28 grundler 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/mm.h>
31 #include <linux/slab.h>
32 #include <linux/seq_file.h>
33 #include <linux/init.h>
34 #include <linux/delay.h>
35 #define PCI_DEBUG
36 #include <linux/pci.h>
37 #undef PCI_DEBUG
38
39 #include <asm/cache.h>
40 #include <asm/hardware.h> /* for register_parisc_driver() stuff */
41 #include <asm/processor.h>
42 #include <asm/page.h>
43 #include <asm/pdc.h>
44 #include <asm/irq.h> /* for struct irq_region */
45
46 struct system_cpuinfo_parisc boot_cpu_data;
47 struct cpuinfo_parisc cpu_data[NR_CPUS];
48
49 /*
50 ** PARISC CPU driver - claim "device" and initialize CPU data structures.
51 **
52 ** Consolidate per CPU initialization into (mostly) one module.
53 ** Monarch CPU will initialize boot_cpu_data which shouldn't
54 ** change once the system has booted.
55 **
56 ** The callback *should* do per-instance initialization of
57 ** everything including the monarch. "Per CPU" init code in
58 ** setup.c:start_parisc() has migrated here and start_parisc()
59 ** will call register_parisc_driver(&cpu_driver) before calling do_inventory().
60 **
61 ** The goal of consolidating CPU initialization into one place is
62 ** to make sure all CPU's get initialized the same way.
63 ** The code path not shared is how PDC hands control of the CPU to the OS.
64 ** The initialization of OS data structures is the same (done below).
65 */
66
67 /**
68 * processor_probe - Determine if processor driver should claim this device.
69 * @dev: The device which has been found.
70 *
71 * Determine if processor driver should claim this chip (return 0) or not
72 * (return 1). If so, initialize the chip and tell other partners in crime
73 * they have work to do.
74 */
processor_probe(struct parisc_device * dev)75 static int __init processor_probe(struct parisc_device *dev)
76 {
77 unsigned long txn_addr;
78 unsigned long cpuid;
79 struct cpuinfo_parisc *p;
80
81 #ifndef CONFIG_SMP
82 if (boot_cpu_data.cpu_count > 0) {
83 printk(KERN_INFO "CONFIG_SMP=n ignoring additional CPUs\n");
84 return 1;
85 }
86 #endif
87
88 /* logical CPU ID and update global counter
89 * May get overwritten by PAT code.
90 */
91 cpuid = boot_cpu_data.cpu_count;
92 txn_addr = dev->hpa; /* for legacy PDC */
93
94 #ifdef __LP64__
95 if (is_pdc_pat()) {
96 ulong status;
97 unsigned long bytecnt;
98 pdc_pat_cell_mod_maddr_block_t pa_pdc_cell;
99 #undef USE_PAT_CPUID
100 #ifdef USE_PAT_CPUID
101 struct pdc_pat_cpu_num cpu_info;
102 #endif
103
104 status = pdc_pat_cell_module(&bytecnt, dev->pcell_loc,
105 dev->mod_index, PA_VIEW, &pa_pdc_cell);
106
107 ASSERT(PDC_OK == status);
108
109 /* verify it's the same as what do_pat_inventory() found */
110 ASSERT(dev->mod_info == pa_pdc_cell.mod_info);
111 ASSERT(dev->pmod_loc == pa_pdc_cell.mod_location);
112
113 txn_addr = pa_pdc_cell.mod[0]; /* id_eid for IO sapic */
114
115 #ifdef USE_PAT_CPUID
116 /* We need contiguous numbers for cpuid. Firmware's notion
117 * of cpuid is for physical CPUs and we just don't care yet.
118 * We'll care when we need to query PAT PDC about a CPU *after*
119 * boot time (ie shutdown a CPU from an OS perspective).
120 */
121 /* get the cpu number */
122 status = pdc_pat_cpu_get_number(&cpu_info, dev->hpa);
123
124 ASSERT(PDC_OK == status);
125
126 if (cpu_info.cpu_num >= NR_CPUS) {
127 printk(KERN_WARNING "IGNORING CPU at 0x%x,"
128 " cpu_slot_id > NR_CPUS"
129 " (%ld > %d)\n",
130 dev->hpa, cpu_info.cpu_num, NR_CPUS);
131 /* Ignore CPU since it will only crash */
132 boot_cpu_data.cpu_count--;
133 return 1;
134 } else {
135 cpuid = cpu_info.cpu_num;
136 }
137 #endif
138 }
139 #endif
140
141 p = &cpu_data[cpuid];
142 boot_cpu_data.cpu_count++;
143
144 /* initialize counters */
145 memset(p, 0, sizeof(struct cpuinfo_parisc));
146
147 p->dev = dev; /* Save IODC data in case we need it */
148 p->hpa = dev->hpa; /* save CPU hpa */
149 p->cpuid = cpuid; /* save CPU id */
150 p->txn_addr = txn_addr; /* save CPU IRQ address */
151 #ifdef CONFIG_SMP
152 p->lock = SPIN_LOCK_UNLOCKED;
153
154 /*
155 ** FIXME: review if any other initialization is clobbered
156 ** for boot_cpu by the above memset().
157 */
158
159 /* stolen from init_percpu_prof() */
160 cpu_data[cpuid].prof_counter = 1;
161 cpu_data[cpuid].prof_multiplier = 1;
162 #endif
163
164 /*
165 ** CONFIG_SMP: init_smp_config() will attempt to get CPU's into
166 ** OS control. RENDEZVOUS is the default state - see mem_set above.
167 ** p->state = STATE_RENDEZVOUS;
168 */
169
170 #if 0
171 /* CPU 0 IRQ table is statically allocated/initialized */
172 if (cpuid) {
173 struct irqaction actions[];
174
175 /*
176 ** itimer and ipi IRQ handlers are statically initialized in
177 ** arch/parisc/kernel/irq.c. ie Don't need to register them.
178 */
179 actions = kmalloc(sizeof(struct irqaction)*MAX_CPU_IRQ, GFP_ATOMIC);
180 if (!actions) {
181 /* not getting it's own table, share with monarch */
182 actions = cpu_irq_actions[0];
183 }
184
185 cpu_irq_actions[cpuid] = actions;
186 }
187 #endif
188 return 0;
189 }
190
191 /**
192 * collect_boot_cpu_data - Fill the boot_cpu_data structure.
193 *
194 * This function collects and stores the generic processor information
195 * in the boot_cpu_data structure.
196 */
collect_boot_cpu_data(void)197 void __init collect_boot_cpu_data(void)
198 {
199 memset(&boot_cpu_data, 0, sizeof(boot_cpu_data));
200
201 boot_cpu_data.cpu_hz = 100 * PAGE0->mem_10msec; /* Hz of this PARISC */
202
203 /* get CPU-Model Information... */
204 #define p ((unsigned long *)&boot_cpu_data.pdc.model)
205 if (pdc_model_info(&boot_cpu_data.pdc.model) == PDC_OK)
206 printk(KERN_INFO
207 "model %08lx %08lx %08lx %08lx %08lx %08lx %08lx %08lx %08lx\n",
208 p[0], p[1], p[2], p[3], p[4], p[5], p[6], p[7], p[8]);
209 #undef p
210
211 if (pdc_model_versions(&boot_cpu_data.pdc.versions, 0) == PDC_OK)
212 printk(KERN_INFO "vers %08lx\n",
213 boot_cpu_data.pdc.versions);
214
215 if (pdc_model_cpuid(&boot_cpu_data.pdc.cpuid) == PDC_OK)
216 printk(KERN_INFO "CPUID vers %ld rev %ld (0x%08lx)\n",
217 (boot_cpu_data.pdc.cpuid >> 5) & 127,
218 boot_cpu_data.pdc.cpuid & 31,
219 boot_cpu_data.pdc.cpuid);
220
221 if (pdc_model_capabilities(&boot_cpu_data.pdc.capabilities) == PDC_OK)
222 printk(KERN_INFO "capabilities 0x%lx\n",
223 boot_cpu_data.pdc.capabilities);
224
225 if (pdc_model_sysmodel(boot_cpu_data.pdc.sys_model_name) == PDC_OK)
226 printk(KERN_INFO "model %s\n",
227 boot_cpu_data.pdc.sys_model_name);
228
229 boot_cpu_data.hversion = boot_cpu_data.pdc.model.hversion;
230 boot_cpu_data.sversion = boot_cpu_data.pdc.model.sversion;
231
232 boot_cpu_data.cpu_type =
233 parisc_get_cpu_type(boot_cpu_data.hversion);
234
235 boot_cpu_data.cpu_name = cpu_name_version[boot_cpu_data.cpu_type][0];
236 boot_cpu_data.family_name = cpu_name_version[boot_cpu_data.cpu_type][1];
237 }
238
239
240 /**
241 * init_cpu_profiler - enable/setup per cpu profiling hooks.
242 * @cpunum: The processor instance.
243 *
244 * FIXME: doesn't do much yet...
245 */
246 static inline void __init
init_percpu_prof(int cpunum)247 init_percpu_prof(int cpunum)
248 {
249 cpu_data[cpunum].prof_counter = 1;
250 cpu_data[cpunum].prof_multiplier = 1;
251 }
252
253
254 /**
255 * init_per_cpu - Handle individual processor initializations.
256 * @cpunum: logical processor number.
257 *
258 * This function handles initialization for *every* CPU
259 * in the system:
260 *
261 * o Set "default" CPU width for trap handlers
262 *
263 * o Enable FP coprocessor
264 * REVISIT: this could be done in the "code 22" trap handler.
265 * (frowands idea - that way we know which processes need FP
266 * registers saved on the interrupt stack.)
267 * NEWS FLASH: wide kernels need FP coprocessor enabled to handle
268 * formatted printing of %lx for example (double divides I think)
269 *
270 * o Enable CPU profiling hooks.
271 */
init_per_cpu(int cpunum)272 int __init init_per_cpu(int cpunum)
273 {
274 int ret;
275 struct pdc_coproc_cfg coproc_cfg;
276
277 ret = pdc_coproc_cfg(&coproc_cfg);
278
279 if(ret >= 0 && coproc_cfg.ccr_functional) {
280 mtctl(coproc_cfg.ccr_functional, 10); /* 10 == Coprocessor Control Reg */
281
282 /* FWIW, FP rev/model is a more accurate way to determine
283 ** CPU type. CPU rev/model has some ambiguous cases.
284 */
285 cpu_data[cpunum].fp_rev = coproc_cfg.revision;
286 cpu_data[cpunum].fp_model = coproc_cfg.model;
287
288 printk(KERN_INFO "FP[%d] enabled: Rev %ld Model %ld\n",
289 cpunum, coproc_cfg.revision, coproc_cfg.model);
290
291 /*
292 ** store status register to stack (hopefully aligned)
293 ** and clear the T-bit.
294 */
295 asm volatile ("fstd %fr0,8(%sp)");
296
297 } else {
298 printk(KERN_WARNING "WARNING: No FP CoProcessor?!"
299 " (coproc_cfg.ccr_functional == 0x%lx, expected 0xc0)\n"
300 #ifdef __LP64__
301 "Halting Machine - FP required\n"
302 #endif
303 , coproc_cfg.ccr_functional);
304 #ifdef __LP64__
305 mdelay(100); /* previous chars get pushed to console */
306 panic("FP CoProc not reported");
307 #endif
308 }
309
310 /* FUTURE: Enable Performance Monitor : ccr bit 0x20 */
311 init_percpu_prof(cpunum);
312
313 return ret;
314 }
315
316 /*
317 * Display cpu info for all cpu's.
318 */
319 int
show_cpuinfo(struct seq_file * m,void * v)320 show_cpuinfo (struct seq_file *m, void *v)
321 {
322 int n;
323
324 for(n=0; n<boot_cpu_data.cpu_count; n++) {
325 #ifdef CONFIG_SMP
326 if (0 == cpu_data[n].hpa)
327 continue;
328 #ifdef ENTRY_SYS_CPUS
329 #error iCOD support wants to show CPU state here
330 #endif
331 #endif
332 seq_printf(m, "processor\t: %d\n"
333 "cpu family\t: PA-RISC %s\n",
334 n, boot_cpu_data.family_name);
335
336 seq_printf(m, "cpu\t\t: %s\n", boot_cpu_data.cpu_name );
337
338 /* cpu MHz */
339 seq_printf(m, "cpu MHz\t\t: %d.%06d\n",
340 boot_cpu_data.cpu_hz / 1000000,
341 boot_cpu_data.cpu_hz % 1000000 );
342
343 seq_printf(m, "model\t\t: %s\n"
344 "model name\t: %s\n",
345 boot_cpu_data.pdc.sys_model_name,
346 cpu_data[n].dev ?
347 cpu_data[n].dev->name : "Unknown" );
348
349 seq_printf(m, "hversion\t: 0x%08x\n"
350 "sversion\t: 0x%08x\n",
351 boot_cpu_data.hversion,
352 boot_cpu_data.sversion );
353
354 /* print cachesize info */
355 show_cache_info(m);
356
357 seq_printf(m, "bogomips\t: %lu.%02lu\n",
358 loops_per_jiffy / (500000 / HZ),
359 (loops_per_jiffy / (5000 / HZ)) % 100);
360
361 seq_printf(m, "software id\t: %ld\n\n",
362 boot_cpu_data.pdc.model.sw_id);
363 }
364 return 0;
365 }
366
367 static struct parisc_device_id processor_tbl[] = {
368 { HPHW_NPROC, HVERSION_REV_ANY_ID, HVERSION_ANY_ID, SVERSION_ANY_ID },
369 { 0, }
370 };
371
372 static struct parisc_driver cpu_driver = {
373 name: "CPU",
374 id_table: processor_tbl,
375 probe: processor_probe
376 };
377
378 /**
379 * processor_init - Processor initalization procedure.
380 *
381 * Register this driver.
382 */
processor_init(void)383 void __init processor_init(void)
384 {
385 register_parisc_driver(&cpu_driver);
386 }
387