1 /* $Id: processor.c,v 1.1 2002/07/20 16:27:06 rhirst Exp $
3 * Initial setup-routines for HP 9000 based hardware.
5 * Copyright (C) 1991, 1992, 1995 Linus Torvalds
6 * Modifications for PA-RISC (C) 1999-2008 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>
12 * Initial PA-RISC Version: 04-23-1999 by Helge Deller
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)
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.
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.
29 #include <linux/delay.h>
30 #include <linux/init.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>
42 #include <asm/pdcpat.h>
43 #include <asm/irq.h> /* for struct irq_region */
44 #include <asm/parisc-device.h>
46 struct system_cpuinfo_parisc boot_cpu_data __read_mostly;
47 EXPORT_SYMBOL(boot_cpu_data);
49 DEFINE_PER_CPU(struct cpuinfo_parisc, cpu_data);
51 extern int update_cr16_clocksource(void); /* from time.c */
54 ** PARISC CPU driver - claim "device" and initialize CPU data structures.
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.
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().
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).
72 * init_cpu_profiler - enable/setup per cpu profiling hooks.
73 * @cpunum: The processor instance.
75 * FIXME: doesn't do much yet...
78 init_percpu_prof(unsigned long cpunum)
80 struct cpuinfo_parisc *p;
82 p = &per_cpu(cpu_data, cpunum);
84 p->prof_multiplier = 1;
89 * processor_probe - Determine if processor driver should claim this device.
90 * @dev: The device which has been found.
92 * Determine if processor driver should claim this chip (return 0) or not
93 * (return 1). If so, initialize the chip and tell other partners in crime
94 * they have work to do.
96 static int __cpuinit processor_probe(struct parisc_device *dev)
98 unsigned long txn_addr;
100 struct cpuinfo_parisc *p;
103 if (num_online_cpus() >= NR_CPUS) {
104 printk(KERN_INFO "num_online_cpus() >= NR_CPUS\n");
108 if (boot_cpu_data.cpu_count > 0) {
109 printk(KERN_INFO "CONFIG_SMP=n ignoring additional CPUs\n");
114 /* logical CPU ID and update global counter
115 * May get overwritten by PAT code.
117 cpuid = boot_cpu_data.cpu_count;
118 txn_addr = dev->hpa.start; /* for legacy PDC */
123 unsigned long bytecnt;
124 pdc_pat_cell_mod_maddr_block_t pa_pdc_cell;
127 struct pdc_pat_cpu_num cpu_info;
130 status = pdc_pat_cell_module(&bytecnt, dev->pcell_loc,
131 dev->mod_index, PA_VIEW, &pa_pdc_cell);
133 BUG_ON(PDC_OK != status);
135 /* verify it's the same as what do_pat_inventory() found */
136 BUG_ON(dev->mod_info != pa_pdc_cell.mod_info);
137 BUG_ON(dev->pmod_loc != pa_pdc_cell.mod_location);
139 txn_addr = pa_pdc_cell.mod[0]; /* id_eid for IO sapic */
142 /* We need contiguous numbers for cpuid. Firmware's notion
143 * of cpuid is for physical CPUs and we just don't care yet.
144 * We'll care when we need to query PAT PDC about a CPU *after*
145 * boot time (ie shutdown a CPU from an OS perspective).
147 /* get the cpu number */
148 status = pdc_pat_cpu_get_number(&cpu_info, dev->hpa.start);
150 BUG_ON(PDC_OK != status);
152 if (cpu_info.cpu_num >= NR_CPUS) {
153 printk(KERN_WARNING "IGNORING CPU at 0x%x,"
154 " cpu_slot_id > NR_CPUS"
156 dev->hpa.start, cpu_info.cpu_num, NR_CPUS);
157 /* Ignore CPU since it will only crash */
158 boot_cpu_data.cpu_count--;
161 cpuid = cpu_info.cpu_num;
167 p = &per_cpu(cpu_data, cpuid);
168 boot_cpu_data.cpu_count++;
170 /* initialize counters - CPU 0 gets it_value set in time_init() */
172 memset(p, 0, sizeof(struct cpuinfo_parisc));
174 p->loops_per_jiffy = loops_per_jiffy;
175 p->dev = dev; /* Save IODC data in case we need it */
176 p->hpa = dev->hpa.start; /* save CPU hpa */
177 p->cpuid = cpuid; /* save CPU id */
178 p->txn_addr = txn_addr; /* save CPU IRQ address */
181 ** FIXME: review if any other initialization is clobbered
182 ** for boot_cpu by the above memset().
184 init_percpu_prof(cpuid);
188 ** CONFIG_SMP: init_smp_config() will attempt to get CPUs into
189 ** OS control. RENDEZVOUS is the default state - see mem_set above.
190 ** p->state = STATE_RENDEZVOUS;
194 /* CPU 0 IRQ table is statically allocated/initialized */
196 struct irqaction actions[];
199 ** itimer and ipi IRQ handlers are statically initialized in
200 ** arch/parisc/kernel/irq.c. ie Don't need to register them.
202 actions = kmalloc(sizeof(struct irqaction)*MAX_CPU_IRQ, GFP_ATOMIC);
204 /* not getting it's own table, share with monarch */
205 actions = cpu_irq_actions[0];
208 cpu_irq_actions[cpuid] = actions;
213 * Bring this CPU up now! (ignore bootstrap cpuid == 0)
217 cpu_set(cpuid, cpu_present_map);
222 /* If we've registered more than one cpu,
223 * we'll use the jiffies clocksource since cr16
224 * is not synchronized between CPUs.
226 update_cr16_clocksource();
232 * collect_boot_cpu_data - Fill the boot_cpu_data structure.
234 * This function collects and stores the generic processor information
235 * in the boot_cpu_data structure.
237 void __init collect_boot_cpu_data(void)
239 memset(&boot_cpu_data, 0, sizeof(boot_cpu_data));
241 boot_cpu_data.cpu_hz = 100 * PAGE0->mem_10msec; /* Hz of this PARISC */
243 /* get CPU-Model Information... */
244 #define p ((unsigned long *)&boot_cpu_data.pdc.model)
245 if (pdc_model_info(&boot_cpu_data.pdc.model) == PDC_OK)
247 "model %08lx %08lx %08lx %08lx %08lx %08lx %08lx %08lx %08lx\n",
248 p[0], p[1], p[2], p[3], p[4], p[5], p[6], p[7], p[8]);
251 if (pdc_model_versions(&boot_cpu_data.pdc.versions, 0) == PDC_OK)
252 printk(KERN_INFO "vers %08lx\n",
253 boot_cpu_data.pdc.versions);
255 if (pdc_model_cpuid(&boot_cpu_data.pdc.cpuid) == PDC_OK)
256 printk(KERN_INFO "CPUID vers %ld rev %ld (0x%08lx)\n",
257 (boot_cpu_data.pdc.cpuid >> 5) & 127,
258 boot_cpu_data.pdc.cpuid & 31,
259 boot_cpu_data.pdc.cpuid);
261 if (pdc_model_capabilities(&boot_cpu_data.pdc.capabilities) == PDC_OK)
262 printk(KERN_INFO "capabilities 0x%lx\n",
263 boot_cpu_data.pdc.capabilities);
265 if (pdc_model_sysmodel(boot_cpu_data.pdc.sys_model_name) == PDC_OK)
266 printk(KERN_INFO "model %s\n",
267 boot_cpu_data.pdc.sys_model_name);
269 boot_cpu_data.hversion = boot_cpu_data.pdc.model.hversion;
270 boot_cpu_data.sversion = boot_cpu_data.pdc.model.sversion;
272 boot_cpu_data.cpu_type = parisc_get_cpu_type(boot_cpu_data.hversion);
273 boot_cpu_data.cpu_name = cpu_name_version[boot_cpu_data.cpu_type][0];
274 boot_cpu_data.family_name = cpu_name_version[boot_cpu_data.cpu_type][1];
280 * init_per_cpu - Handle individual processor initializations.
281 * @cpunum: logical processor number.
283 * This function handles initialization for *every* CPU
286 * o Set "default" CPU width for trap handlers
288 * o Enable FP coprocessor
289 * REVISIT: this could be done in the "code 22" trap handler.
290 * (frowands idea - that way we know which processes need FP
291 * registers saved on the interrupt stack.)
292 * NEWS FLASH: wide kernels need FP coprocessor enabled to handle
293 * formatted printing of %lx for example (double divides I think)
295 * o Enable CPU profiling hooks.
297 int __cpuinit init_per_cpu(int cpunum)
300 struct pdc_coproc_cfg coproc_cfg;
302 set_firmware_width();
303 ret = pdc_coproc_cfg(&coproc_cfg);
305 if(ret >= 0 && coproc_cfg.ccr_functional) {
306 mtctl(coproc_cfg.ccr_functional, 10); /* 10 == Coprocessor Control Reg */
308 /* FWIW, FP rev/model is a more accurate way to determine
309 ** CPU type. CPU rev/model has some ambiguous cases.
311 per_cpu(cpu_data, cpunum).fp_rev = coproc_cfg.revision;
312 per_cpu(cpu_data, cpunum).fp_model = coproc_cfg.model;
314 printk(KERN_INFO "FP[%d] enabled: Rev %ld Model %ld\n",
315 cpunum, coproc_cfg.revision, coproc_cfg.model);
318 ** store status register to stack (hopefully aligned)
319 ** and clear the T-bit.
321 asm volatile ("fstd %fr0,8(%sp)");
324 printk(KERN_WARNING "WARNING: No FP CoProcessor?!"
325 " (coproc_cfg.ccr_functional == 0x%lx, expected 0xc0)\n"
327 "Halting Machine - FP required\n"
329 , coproc_cfg.ccr_functional);
331 mdelay(100); /* previous chars get pushed to console */
332 panic("FP CoProc not reported");
336 /* FUTURE: Enable Performance Monitor : ccr bit 0x20 */
337 init_percpu_prof(cpunum);
343 * Display CPU info for all CPUs.
346 show_cpuinfo (struct seq_file *m, void *v)
350 for_each_online_cpu(cpu) {
351 const struct cpuinfo_parisc *cpuinfo = &per_cpu(cpu_data, cpu);
353 if (0 == cpuinfo->hpa)
356 seq_printf(m, "processor\t: %lu\n"
357 "cpu family\t: PA-RISC %s\n",
358 cpu, boot_cpu_data.family_name);
360 seq_printf(m, "cpu\t\t: %s\n", boot_cpu_data.cpu_name );
363 seq_printf(m, "cpu MHz\t\t: %d.%06d\n",
364 boot_cpu_data.cpu_hz / 1000000,
365 boot_cpu_data.cpu_hz % 1000000 );
367 seq_printf(m, "model\t\t: %s\n"
368 "model name\t: %s\n",
369 boot_cpu_data.pdc.sys_model_name,
371 cpuinfo->dev->name : "Unknown");
373 seq_printf(m, "hversion\t: 0x%08x\n"
374 "sversion\t: 0x%08x\n",
375 boot_cpu_data.hversion,
376 boot_cpu_data.sversion );
378 /* print cachesize info */
381 seq_printf(m, "bogomips\t: %lu.%02lu\n",
382 cpuinfo->loops_per_jiffy / (500000 / HZ),
383 (cpuinfo->loops_per_jiffy / (5000 / HZ)) % 100);
385 seq_printf(m, "software id\t: %ld\n\n",
386 boot_cpu_data.pdc.model.sw_id);
391 static const struct parisc_device_id processor_tbl[] = {
392 { HPHW_NPROC, HVERSION_REV_ANY_ID, HVERSION_ANY_ID, SVERSION_ANY_ID },
396 static struct parisc_driver cpu_driver = {
398 .id_table = processor_tbl,
399 .probe = processor_probe
403 * processor_init - Processor initialization procedure.
405 * Register this driver.
407 void __init processor_init(void)
409 register_parisc_driver(&cpu_driver);