arch/parisc/kernel/processor.c

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