1 // SPDX-License-Identifier: GPL-2.0-or-later
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) 1999-2008 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>
11 *
12 * Initial PA-RISC Version: 04-23-1999 by Helge Deller
13 */
14 #include <linux/delay.h>
15 #include <linux/init.h>
16 #include <linux/mm.h>
17 #include <linux/module.h>
18 #include <linux/seq_file.h>
19 #include <linux/random.h>
20 #include <linux/slab.h>
21 #include <linux/cpu.h>
22 #include <asm/param.h>
23 #include <asm/cache.h>
24 #include <asm/hardware.h> /* for register_parisc_driver() stuff */
25 #include <asm/processor.h>
26 #include <asm/page.h>
27 #include <asm/pdc.h>
28 #include <asm/pdcpat.h>
29 #include <asm/irq.h> /* for struct irq_region */
30 #include <asm/parisc-device.h>
31
32 struct system_cpuinfo_parisc boot_cpu_data __ro_after_init;
33 EXPORT_SYMBOL(boot_cpu_data);
34 #ifdef CONFIG_PA8X00
35 int _parisc_requires_coherency __ro_after_init;
36 EXPORT_SYMBOL(_parisc_requires_coherency);
37 #endif
38
39 DEFINE_PER_CPU(struct cpuinfo_parisc, cpu_data);
40
41 /*
42 ** PARISC CPU driver - claim "device" and initialize CPU data structures.
43 **
44 ** Consolidate per CPU initialization into (mostly) one module.
45 ** Monarch CPU will initialize boot_cpu_data which shouldn't
46 ** change once the system has booted.
47 **
48 ** The callback *should* do per-instance initialization of
49 ** everything including the monarch. "Per CPU" init code in
50 ** setup.c:start_parisc() has migrated here and start_parisc()
51 ** will call register_parisc_driver(&cpu_driver) before calling do_inventory().
52 **
53 ** The goal of consolidating CPU initialization into one place is
54 ** to make sure all CPUs get initialized the same way.
55 ** The code path not shared is how PDC hands control of the CPU to the OS.
56 ** The initialization of OS data structures is the same (done below).
57 */
58
59 /**
60 * init_cpu_profiler - enable/setup per cpu profiling hooks.
61 * @cpunum: The processor instance.
62 *
63 * FIXME: doesn't do much yet...
64 */
65 static void
init_percpu_prof(unsigned long cpunum)66 init_percpu_prof(unsigned long cpunum)
67 {
68 }
69
70
71 /**
72 * processor_probe - Determine if processor driver should claim this device.
73 * @dev: The device which has been found.
74 *
75 * Determine if processor driver should claim this chip (return 0) or not
76 * (return 1). If so, initialize the chip and tell other partners in crime
77 * they have work to do.
78 */
processor_probe(struct parisc_device * dev)79 static int __init processor_probe(struct parisc_device *dev)
80 {
81 unsigned long txn_addr;
82 unsigned long cpuid;
83 struct cpuinfo_parisc *p;
84 struct pdc_pat_cpu_num cpu_info = { };
85
86 #ifdef CONFIG_SMP
87 if (num_online_cpus() >= nr_cpu_ids) {
88 printk(KERN_INFO "num_online_cpus() >= nr_cpu_ids\n");
89 return 1;
90 }
91 #else
92 if (boot_cpu_data.cpu_count > 0) {
93 printk(KERN_INFO "CONFIG_SMP=n ignoring additional CPUs\n");
94 return 1;
95 }
96 #endif
97
98 /* logical CPU ID and update global counter
99 * May get overwritten by PAT code.
100 */
101 cpuid = boot_cpu_data.cpu_count;
102 txn_addr = dev->hpa.start; /* for legacy PDC */
103 cpu_info.cpu_num = cpu_info.cpu_loc = cpuid;
104
105 #ifdef CONFIG_64BIT
106 if (is_pdc_pat()) {
107 ulong status;
108 unsigned long bytecnt;
109 pdc_pat_cell_mod_maddr_block_t *pa_pdc_cell;
110
111 pa_pdc_cell = kmalloc(sizeof (*pa_pdc_cell), GFP_KERNEL);
112 if (!pa_pdc_cell)
113 panic("couldn't allocate memory for PDC_PAT_CELL!");
114
115 status = pdc_pat_cell_module(&bytecnt, dev->pcell_loc,
116 dev->mod_index, PA_VIEW, pa_pdc_cell);
117
118 BUG_ON(PDC_OK != status);
119
120 /* verify it's the same as what do_pat_inventory() found */
121 BUG_ON(dev->mod_info != pa_pdc_cell->mod_info);
122 BUG_ON(dev->pmod_loc != pa_pdc_cell->mod_location);
123
124 txn_addr = pa_pdc_cell->mod[0]; /* id_eid for IO sapic */
125
126 kfree(pa_pdc_cell);
127
128 /* get the cpu number */
129 status = pdc_pat_cpu_get_number(&cpu_info, dev->hpa.start);
130 BUG_ON(PDC_OK != status);
131
132 pr_info("Logical CPU #%lu is physical cpu #%lu at location "
133 "0x%lx with hpa %pa\n",
134 cpuid, cpu_info.cpu_num, cpu_info.cpu_loc,
135 &dev->hpa.start);
136
137 #undef USE_PAT_CPUID
138 #ifdef USE_PAT_CPUID
139 /* We need contiguous numbers for cpuid. Firmware's notion
140 * of cpuid is for physical CPUs and we just don't care yet.
141 * We'll care when we need to query PAT PDC about a CPU *after*
142 * boot time (ie shutdown a CPU from an OS perspective).
143 */
144 if (cpu_info.cpu_num >= NR_CPUS) {
145 printk(KERN_WARNING "IGNORING CPU at %pa,"
146 " cpu_slot_id > NR_CPUS"
147 " (%ld > %d)\n",
148 &dev->hpa.start, cpu_info.cpu_num, NR_CPUS);
149 /* Ignore CPU since it will only crash */
150 boot_cpu_data.cpu_count--;
151 return 1;
152 } else {
153 cpuid = cpu_info.cpu_num;
154 }
155 #endif
156 }
157 #endif
158
159 p = &per_cpu(cpu_data, cpuid);
160 boot_cpu_data.cpu_count++;
161
162 /* initialize counters - CPU 0 gets it_value set in time_init() */
163 if (cpuid)
164 memset(p, 0, sizeof(struct cpuinfo_parisc));
165
166 p->dev = dev; /* Save IODC data in case we need it */
167 p->hpa = dev->hpa.start; /* save CPU hpa */
168 p->cpuid = cpuid; /* save CPU id */
169 p->txn_addr = txn_addr; /* save CPU IRQ address */
170 p->cpu_num = cpu_info.cpu_num;
171 p->cpu_loc = cpu_info.cpu_loc;
172
173 store_cpu_topology(cpuid);
174
175 #ifdef CONFIG_SMP
176 /*
177 ** FIXME: review if any other initialization is clobbered
178 ** for boot_cpu by the above memset().
179 */
180 init_percpu_prof(cpuid);
181 #endif
182
183 /*
184 ** CONFIG_SMP: init_smp_config() will attempt to get CPUs into
185 ** OS control. RENDEZVOUS is the default state - see mem_set above.
186 ** p->state = STATE_RENDEZVOUS;
187 */
188
189 #if 0
190 /* CPU 0 IRQ table is statically allocated/initialized */
191 if (cpuid) {
192 struct irqaction actions[];
193
194 /*
195 ** itimer and ipi IRQ handlers are statically initialized in
196 ** arch/parisc/kernel/irq.c. ie Don't need to register them.
197 */
198 actions = kmalloc(sizeof(struct irqaction)*MAX_CPU_IRQ, GFP_ATOMIC);
199 if (!actions) {
200 /* not getting it's own table, share with monarch */
201 actions = cpu_irq_actions[0];
202 }
203
204 cpu_irq_actions[cpuid] = actions;
205 }
206 #endif
207
208 /*
209 * Bring this CPU up now! (ignore bootstrap cpuid == 0)
210 */
211 #ifdef CONFIG_SMP
212 if (cpuid) {
213 set_cpu_present(cpuid, true);
214 add_cpu(cpuid);
215 }
216 #endif
217
218 return 0;
219 }
220
221 /**
222 * collect_boot_cpu_data - Fill the boot_cpu_data structure.
223 *
224 * This function collects and stores the generic processor information
225 * in the boot_cpu_data structure.
226 */
collect_boot_cpu_data(void)227 void __init collect_boot_cpu_data(void)
228 {
229 unsigned long cr16_seed;
230 char orig_prod_num[64], current_prod_num[64], serial_no[64];
231
232 memset(&boot_cpu_data, 0, sizeof(boot_cpu_data));
233
234 cr16_seed = get_cycles();
235 add_device_randomness(&cr16_seed, sizeof(cr16_seed));
236
237 boot_cpu_data.cpu_hz = 100 * PAGE0->mem_10msec; /* Hz of this PARISC */
238
239 /* get CPU-Model Information... */
240 #define p ((unsigned long *)&boot_cpu_data.pdc.model)
241 if (pdc_model_info(&boot_cpu_data.pdc.model) == PDC_OK) {
242 printk(KERN_INFO
243 "model %08lx %08lx %08lx %08lx %08lx %08lx %08lx %08lx %08lx\n",
244 p[0], p[1], p[2], p[3], p[4], p[5], p[6], p[7], p[8]);
245
246 add_device_randomness(&boot_cpu_data.pdc.model,
247 sizeof(boot_cpu_data.pdc.model));
248 }
249 #undef p
250
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);
254
255 add_device_randomness(&boot_cpu_data.pdc.versions,
256 sizeof(boot_cpu_data.pdc.versions));
257 }
258
259 if (pdc_model_cpuid(&boot_cpu_data.pdc.cpuid) == PDC_OK) {
260 printk(KERN_INFO "CPUID vers %ld rev %ld (0x%08lx)\n",
261 (boot_cpu_data.pdc.cpuid >> 5) & 127,
262 boot_cpu_data.pdc.cpuid & 31,
263 boot_cpu_data.pdc.cpuid);
264
265 add_device_randomness(&boot_cpu_data.pdc.cpuid,
266 sizeof(boot_cpu_data.pdc.cpuid));
267 }
268
269 if (pdc_model_capabilities(&boot_cpu_data.pdc.capabilities) == PDC_OK)
270 printk(KERN_INFO "capabilities 0x%lx\n",
271 boot_cpu_data.pdc.capabilities);
272
273 if (pdc_model_sysmodel(boot_cpu_data.pdc.sys_model_name) == PDC_OK)
274 printk(KERN_INFO "model %s\n",
275 boot_cpu_data.pdc.sys_model_name);
276
277 dump_stack_set_arch_desc("%s", boot_cpu_data.pdc.sys_model_name);
278
279 boot_cpu_data.hversion = boot_cpu_data.pdc.model.hversion;
280 boot_cpu_data.sversion = boot_cpu_data.pdc.model.sversion;
281
282 boot_cpu_data.cpu_type = parisc_get_cpu_type(boot_cpu_data.hversion);
283 boot_cpu_data.cpu_name = cpu_name_version[boot_cpu_data.cpu_type][0];
284 boot_cpu_data.family_name = cpu_name_version[boot_cpu_data.cpu_type][1];
285
286 #ifdef CONFIG_PA8X00
287 _parisc_requires_coherency = (boot_cpu_data.cpu_type == mako) ||
288 (boot_cpu_data.cpu_type == mako2);
289 #endif
290
291 if (pdc_model_platform_info(orig_prod_num, current_prod_num, serial_no) == PDC_OK) {
292 printk(KERN_INFO "product %s, original product %s, S/N: %s\n",
293 current_prod_num[0] ? current_prod_num : "n/a",
294 orig_prod_num, serial_no);
295 add_device_randomness(orig_prod_num, strlen(orig_prod_num));
296 add_device_randomness(current_prod_num, strlen(current_prod_num));
297 add_device_randomness(serial_no, strlen(serial_no));
298 }
299 }
300
301
302 /**
303 * init_per_cpu - Handle individual processor initializations.
304 * @cpunum: logical processor number.
305 *
306 * This function handles initialization for *every* CPU
307 * in the system:
308 *
309 * o Set "default" CPU width for trap handlers
310 *
311 * o Enable FP coprocessor
312 * REVISIT: this could be done in the "code 22" trap handler.
313 * (frowands idea - that way we know which processes need FP
314 * registers saved on the interrupt stack.)
315 * NEWS FLASH: wide kernels need FP coprocessor enabled to handle
316 * formatted printing of %lx for example (double divides I think)
317 *
318 * o Enable CPU profiling hooks.
319 */
init_per_cpu(int cpunum)320 int __init init_per_cpu(int cpunum)
321 {
322 int ret;
323 struct pdc_coproc_cfg coproc_cfg;
324
325 set_firmware_width();
326 ret = pdc_coproc_cfg(&coproc_cfg);
327
328 store_cpu_topology(cpunum);
329
330 if(ret >= 0 && coproc_cfg.ccr_functional) {
331 mtctl(coproc_cfg.ccr_functional, 10); /* 10 == Coprocessor Control Reg */
332
333 /* FWIW, FP rev/model is a more accurate way to determine
334 ** CPU type. CPU rev/model has some ambiguous cases.
335 */
336 per_cpu(cpu_data, cpunum).fp_rev = coproc_cfg.revision;
337 per_cpu(cpu_data, cpunum).fp_model = coproc_cfg.model;
338
339 if (cpunum == 0)
340 printk(KERN_INFO "FP[%d] enabled: Rev %ld Model %ld\n",
341 cpunum, coproc_cfg.revision, coproc_cfg.model);
342
343 /*
344 ** store status register to stack (hopefully aligned)
345 ** and clear the T-bit.
346 */
347 asm volatile ("fstd %fr0,8(%sp)");
348
349 } else {
350 printk(KERN_WARNING "WARNING: No FP CoProcessor?!"
351 " (coproc_cfg.ccr_functional == 0x%lx, expected 0xc0)\n"
352 #ifdef CONFIG_64BIT
353 "Halting Machine - FP required\n"
354 #endif
355 , coproc_cfg.ccr_functional);
356 #ifdef CONFIG_64BIT
357 mdelay(100); /* previous chars get pushed to console */
358 panic("FP CoProc not reported");
359 #endif
360 }
361
362 /* FUTURE: Enable Performance Monitor : ccr bit 0x20 */
363 init_percpu_prof(cpunum);
364
365 return ret;
366 }
367
368 /*
369 * Display CPU info for all CPUs.
370 */
371 int
show_cpuinfo(struct seq_file * m,void * v)372 show_cpuinfo (struct seq_file *m, void *v)
373 {
374 unsigned long cpu;
375
376 for_each_online_cpu(cpu) {
377 const struct cpuinfo_parisc *cpuinfo = &per_cpu(cpu_data, cpu);
378 #ifdef CONFIG_SMP
379 if (0 == cpuinfo->hpa)
380 continue;
381 #endif
382 seq_printf(m, "processor\t: %lu\n"
383 "cpu family\t: PA-RISC %s\n",
384 cpu, boot_cpu_data.family_name);
385
386 seq_printf(m, "cpu\t\t: %s\n", boot_cpu_data.cpu_name );
387
388 /* cpu MHz */
389 seq_printf(m, "cpu MHz\t\t: %d.%06d\n",
390 boot_cpu_data.cpu_hz / 1000000,
391 boot_cpu_data.cpu_hz % 1000000 );
392
393 #ifdef CONFIG_PARISC_CPU_TOPOLOGY
394 seq_printf(m, "physical id\t: %d\n",
395 topology_physical_package_id(cpu));
396 seq_printf(m, "siblings\t: %d\n",
397 cpumask_weight(topology_core_cpumask(cpu)));
398 seq_printf(m, "core id\t\t: %d\n", topology_core_id(cpu));
399 #endif
400
401 seq_printf(m, "capabilities\t:");
402 if (boot_cpu_data.pdc.capabilities & PDC_MODEL_OS32)
403 seq_puts(m, " os32");
404 if (boot_cpu_data.pdc.capabilities & PDC_MODEL_OS64)
405 seq_puts(m, " os64");
406 if (boot_cpu_data.pdc.capabilities & PDC_MODEL_IOPDIR_FDC)
407 seq_puts(m, " iopdir_fdc");
408 switch (boot_cpu_data.pdc.capabilities & PDC_MODEL_NVA_MASK) {
409 case PDC_MODEL_NVA_SUPPORTED:
410 seq_puts(m, " nva_supported");
411 break;
412 case PDC_MODEL_NVA_SLOW:
413 seq_puts(m, " nva_slow");
414 break;
415 case PDC_MODEL_NVA_UNSUPPORTED:
416 seq_puts(m, " needs_equivalent_aliasing");
417 break;
418 }
419 seq_printf(m, " (0x%02lx)\n", boot_cpu_data.pdc.capabilities);
420
421 seq_printf(m, "model\t\t: %s\n"
422 "model name\t: %s\n",
423 boot_cpu_data.pdc.sys_model_name,
424 cpuinfo->dev ?
425 cpuinfo->dev->name : "Unknown");
426
427 seq_printf(m, "hversion\t: 0x%08x\n"
428 "sversion\t: 0x%08x\n",
429 boot_cpu_data.hversion,
430 boot_cpu_data.sversion );
431
432 /* print cachesize info */
433 show_cache_info(m);
434
435 seq_printf(m, "bogomips\t: %lu.%02lu\n",
436 loops_per_jiffy / (500000 / HZ),
437 loops_per_jiffy / (5000 / HZ) % 100);
438
439 seq_printf(m, "software id\t: %ld\n\n",
440 boot_cpu_data.pdc.model.sw_id);
441 }
442 return 0;
443 }
444
445 static const struct parisc_device_id processor_tbl[] __initconst = {
446 { HPHW_NPROC, HVERSION_REV_ANY_ID, HVERSION_ANY_ID, SVERSION_ANY_ID },
447 { 0, }
448 };
449
450 static struct parisc_driver cpu_driver __refdata = {
451 .name = "CPU",
452 .id_table = processor_tbl,
453 .probe = processor_probe
454 };
455
456 /**
457 * processor_init - Processor initialization procedure.
458 *
459 * Register this driver.
460 */
processor_init(void)461 void __init processor_init(void)
462 {
463 register_parisc_driver(&cpu_driver);
464 }
465