arch/parisc/kernel/processor.c

   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
  47 struct system_cpuinfo_parisc boot_cpu_data;
  48 EXPORT_SYMBOL(boot_cpu_data);
  49
  50 struct cpuinfo_parisc cpu_data[NR_CPUS];
  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  */
  78 static 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;
  95         txn_addr = dev->hpa;    /* for legacy PDC */
  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 */
 125                 status = pdc_pat_cpu_get_number(&cpu_info, dev->hpa);
 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",
 133                                 dev->hpa, cpu_info.cpu_num, NR_CPUS);
 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 */
 152         p->hpa = dev->hpa;      /* save CPU hpa */
 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  */
 212 void __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  */
 259 static inline void __init
 260 init_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  */
 285 int __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  */
 333 int
 334 show_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
 381 static struct parisc_device_id processor_tbl[] = {
 382         { HPHW_NPROC, HVERSION_REV_ANY_ID, HVERSION_ANY_ID, SVERSION_ANY_ID },
 383         { 0, }
 384 };
 385
 386 static struct parisc_driver cpu_driver = {
 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  */
 397 void __init processor_init(void)
 398 {
 399         register_parisc_driver(&cpu_driver);
 400 }