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/slab.h>
  34 #include <linux/cpu.h>
  35 #include <asm/param.h>
  36 #include <asm/cache.h>
  37 #include <asm/hardware.h>       /* for register_parisc_driver() stuff */
  38 #include <asm/processor.h>
  39 #include <asm/page.h>
  40 #include <asm/pdc.h>
  41 #include <asm/pdcpat.h>
  42 #include <asm/irq.h>            /* for struct irq_region */
  43 #include <asm/parisc-device.h>
  44
  45 struct system_cpuinfo_parisc boot_cpu_data __read_mostly;
  46 EXPORT_SYMBOL(boot_cpu_data);
  47
  48 DEFINE_PER_CPU(struct cpuinfo_parisc, cpu_data);
  49
  50 extern int update_cr16_clocksource(void);       /* from time.c */
  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 CPUs 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  * init_cpu_profiler - enable/setup per cpu profiling hooks.
  72  * @cpunum: The processor instance.
  73  *
  74  * FIXME: doesn't do much yet...
  75  */
  76 static void __cpuinit
  77 init_percpu_prof(unsigned long cpunum)
  78 {
  79         struct cpuinfo_parisc *p;
  80
  81         p = &per_cpu(cpu_data, cpunum);
  82         p->prof_counter = 1;
  83         p->prof_multiplier = 1;
  84 }
  85
  86
  87 /**
  88  * processor_probe - Determine if processor driver should claim this device.
  89  * @dev: The device which has been found.
  90  *
  91  * Determine if processor driver should claim this chip (return 0) or not
  92  * (return 1).  If so, initialize the chip and tell other partners in crime
  93  * they have work to do.
  94  */
  95 static int __cpuinit processor_probe(struct parisc_device *dev)
  96 {
  97         unsigned long txn_addr;
  98         unsigned long cpuid;
  99         struct cpuinfo_parisc *p;
 100
 101 #ifdef CONFIG_SMP
 102         if (num_online_cpus() >= nr_cpu_ids) {
 103                 printk(KERN_INFO "num_online_cpus() >= nr_cpu_ids\n");
 104                 return 1;
 105         }
 106 #else
 107         if (boot_cpu_data.cpu_count > 0) {
 108                 printk(KERN_INFO "CONFIG_SMP=n  ignoring additional CPUs\n");
 109                 return 1;
 110         }
 111 #endif
 112
 113         /* logical CPU ID and update global counter
 114          * May get overwritten by PAT code.
 115          */
 116         cpuid = boot_cpu_data.cpu_count;
 117         txn_addr = dev->hpa.start;      /* for legacy PDC */
 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 #undef USE_PAT_CPUID
 125 #ifdef USE_PAT_CPUID
 126                 struct pdc_pat_cpu_num cpu_info;
 127 #endif
 128
 129                 pa_pdc_cell = kmalloc(sizeof (*pa_pdc_cell), GFP_KERNEL);
 130                 if (!pa_pdc_cell)
 131                         panic("couldn't allocate memory for PDC_PAT_CELL!");
 132
 133                 status = pdc_pat_cell_module(&bytecnt, dev->pcell_loc,
 134                         dev->mod_index, PA_VIEW, pa_pdc_cell);
 135
 136                 BUG_ON(PDC_OK != status);
 137
 138                 /* verify it's the same as what do_pat_inventory() found */
 139                 BUG_ON(dev->mod_info != pa_pdc_cell->mod_info);
 140                 BUG_ON(dev->pmod_loc != pa_pdc_cell->mod_location);
 141
 142                 txn_addr = pa_pdc_cell->mod[0];   /* id_eid for IO sapic */
 143
 144                 kfree(pa_pdc_cell);
 145
 146 #ifdef USE_PAT_CPUID
 147 /* We need contiguous numbers for cpuid. Firmware's notion
 148  * of cpuid is for physical CPUs and we just don't care yet.
 149  * We'll care when we need to query PAT PDC about a CPU *after*
 150  * boot time (ie shutdown a CPU from an OS perspective).
 151  */
 152                 /* get the cpu number */
 153                 status = pdc_pat_cpu_get_number(&cpu_info, dev->hpa.start);
 154
 155                 BUG_ON(PDC_OK != status);
 156
 157                 if (cpu_info.cpu_num >= NR_CPUS) {
 158                         printk(KERN_WARNING "IGNORING CPU at 0x%x,"
 159                                 " cpu_slot_id > NR_CPUS"
 160                                 " (%ld > %d)\n",
 161                                 dev->hpa.start, cpu_info.cpu_num, NR_CPUS);
 162                         /* Ignore CPU since it will only crash */
 163                         boot_cpu_data.cpu_count--;
 164                         return 1;
 165                 } else {
 166                         cpuid = cpu_info.cpu_num;
 167                 }
 168 #endif
 169         }
 170 #endif
 171
 172         p = &per_cpu(cpu_data, cpuid);
 173         boot_cpu_data.cpu_count++;
 174
 175         /* initialize counters - CPU 0 gets it_value set in time_init() */
 176         if (cpuid)
 177                 memset(p, 0, sizeof(struct cpuinfo_parisc));
 178
 179         p->loops_per_jiffy = loops_per_jiffy;
 180         p->dev = dev;           /* Save IODC data in case we need it */
 181         p->hpa = dev->hpa.start;        /* save CPU hpa */
 182         p->cpuid = cpuid;       /* save CPU id */
 183         p->txn_addr = txn_addr; /* save CPU IRQ address */
 184 #ifdef CONFIG_SMP
 185         /*
 186         ** FIXME: review if any other initialization is clobbered
 187         **        for boot_cpu by the above memset().
 188         */
 189         init_percpu_prof(cpuid);
 190 #endif
 191
 192         /*
 193         ** CONFIG_SMP: init_smp_config() will attempt to get CPUs into
 194         ** OS control. RENDEZVOUS is the default state - see mem_set above.
 195         **      p->state = STATE_RENDEZVOUS;
 196         */
 197
 198 #if 0
 199         /* CPU 0 IRQ table is statically allocated/initialized */
 200         if (cpuid) {
 201                 struct irqaction actions[];
 202
 203                 /*
 204                 ** itimer and ipi IRQ handlers are statically initialized in
 205                 ** arch/parisc/kernel/irq.c. ie Don't need to register them.
 206                 */
 207                 actions = kmalloc(sizeof(struct irqaction)*MAX_CPU_IRQ, GFP_ATOMIC);
 208                 if (!actions) {
 209                         /* not getting it's own table, share with monarch */
 210                         actions = cpu_irq_actions[0];
 211                 }
 212
 213                 cpu_irq_actions[cpuid] = actions;
 214         }
 215 #endif
 216
 217         /*
 218          * Bring this CPU up now! (ignore bootstrap cpuid == 0)
 219          */
 220 #ifdef CONFIG_SMP
 221         if (cpuid) {
 222                 set_cpu_present(cpuid, true);
 223                 cpu_up(cpuid);
 224         }
 225 #endif
 226
 227         /* If we've registered more than one cpu,
 228          * we'll use the jiffies clocksource since cr16
 229          * is not synchronized between CPUs.
 230          */
 231         update_cr16_clocksource();
 232
 233         return 0;
 234 }
 235
 236 /**
 237  * collect_boot_cpu_data - Fill the boot_cpu_data structure.
 238  *
 239  * This function collects and stores the generic processor information
 240  * in the boot_cpu_data structure.
 241  */
 242 void __init collect_boot_cpu_data(void)
 243 {
 244         memset(&boot_cpu_data, 0, sizeof(boot_cpu_data));
 245
 246         boot_cpu_data.cpu_hz = 100 * PAGE0->mem_10msec; /* Hz of this PARISC */
 247
 248         /* get CPU-Model Information... */
 249 #define p ((unsigned long *)&boot_cpu_data.pdc.model)
 250         if (pdc_model_info(&boot_cpu_data.pdc.model) == PDC_OK)
 251                 printk(KERN_INFO
 252                         "model %08lx %08lx %08lx %08lx %08lx %08lx %08lx %08lx %08lx\n",
 253                         p[0], p[1], p[2], p[3], p[4], p[5], p[6], p[7], p[8]);
 254 #undef p
 255
 256         if (pdc_model_versions(&boot_cpu_data.pdc.versions, 0) == PDC_OK)
 257                 printk(KERN_INFO "vers  %08lx\n",
 258                         boot_cpu_data.pdc.versions);
 259
 260         if (pdc_model_cpuid(&boot_cpu_data.pdc.cpuid) == PDC_OK)
 261                 printk(KERN_INFO "CPUID vers %ld rev %ld (0x%08lx)\n",
 262                         (boot_cpu_data.pdc.cpuid >> 5) & 127,
 263                         boot_cpu_data.pdc.cpuid & 31,
 264                         boot_cpu_data.pdc.cpuid);
 265
 266         if (pdc_model_capabilities(&boot_cpu_data.pdc.capabilities) == PDC_OK)
 267                 printk(KERN_INFO "capabilities 0x%lx\n",
 268                         boot_cpu_data.pdc.capabilities);
 269
 270         if (pdc_model_sysmodel(boot_cpu_data.pdc.sys_model_name) == PDC_OK)
 271                 printk(KERN_INFO "model %s\n",
 272                         boot_cpu_data.pdc.sys_model_name);
 273
 274         boot_cpu_data.hversion =  boot_cpu_data.pdc.model.hversion;
 275         boot_cpu_data.sversion =  boot_cpu_data.pdc.model.sversion;
 276
 277         boot_cpu_data.cpu_type = parisc_get_cpu_type(boot_cpu_data.hversion);
 278         boot_cpu_data.cpu_name = cpu_name_version[boot_cpu_data.cpu_type][0];
 279         boot_cpu_data.family_name = cpu_name_version[boot_cpu_data.cpu_type][1];
 280 }
 281
 282
 283
 284 /**
 285  * init_per_cpu - Handle individual processor initializations.
 286  * @cpunum: logical processor number.
 287  *
 288  * This function handles initialization for *every* CPU
 289  * in the system:
 290  *
 291  * o Set "default" CPU width for trap handlers
 292  *
 293  * o Enable FP coprocessor
 294  *   REVISIT: this could be done in the "code 22" trap handler.
 295  *      (frowands idea - that way we know which processes need FP
 296  *      registers saved on the interrupt stack.)
 297  *   NEWS FLASH: wide kernels need FP coprocessor enabled to handle
 298  *      formatted printing of %lx for example (double divides I think)
 299  *
 300  * o Enable CPU profiling hooks.
 301  */
 302 int __cpuinit init_per_cpu(int cpunum)
 303 {
 304         int ret;
 305         struct pdc_coproc_cfg coproc_cfg;
 306
 307         set_firmware_width();
 308         ret = pdc_coproc_cfg(&coproc_cfg);
 309
 310         if(ret >= 0 && coproc_cfg.ccr_functional) {
 311                 mtctl(coproc_cfg.ccr_functional, 10);  /* 10 == Coprocessor Control Reg */
 312
 313                 /* FWIW, FP rev/model is a more accurate way to determine
 314                 ** CPU type. CPU rev/model has some ambiguous cases.
 315                 */
 316                 per_cpu(cpu_data, cpunum).fp_rev = coproc_cfg.revision;
 317                 per_cpu(cpu_data, cpunum).fp_model = coproc_cfg.model;
 318
 319                 printk(KERN_INFO  "FP[%d] enabled: Rev %ld Model %ld\n",
 320                         cpunum, coproc_cfg.revision, coproc_cfg.model);
 321
 322                 /*
 323                 ** store status register to stack (hopefully aligned)
 324                 ** and clear the T-bit.
 325                 */
 326                 asm volatile ("fstd    %fr0,8(%sp)");
 327
 328         } else {
 329                 printk(KERN_WARNING  "WARNING: No FP CoProcessor?!"
 330                         " (coproc_cfg.ccr_functional == 0x%lx, expected 0xc0)\n"
 331 #ifdef CONFIG_64BIT
 332                         "Halting Machine - FP required\n"
 333 #endif
 334                         , coproc_cfg.ccr_functional);
 335 #ifdef CONFIG_64BIT
 336                 mdelay(100);    /* previous chars get pushed to console */
 337                 panic("FP CoProc not reported");
 338 #endif
 339         }
 340
 341         /* FUTURE: Enable Performance Monitor : ccr bit 0x20 */
 342         init_percpu_prof(cpunum);
 343
 344         return ret;
 345 }
 346
 347 /*
 348  * Display CPU info for all CPUs.
 349  */
 350 int
 351 show_cpuinfo (struct seq_file *m, void *v)
 352 {
 353         unsigned long cpu;
 354
 355         for_each_online_cpu(cpu) {
 356                 const struct cpuinfo_parisc *cpuinfo = &per_cpu(cpu_data, cpu);
 357 #ifdef CONFIG_SMP
 358                 if (0 == cpuinfo->hpa)
 359                         continue;
 360 #endif
 361                 seq_printf(m, "processor\t: %lu\n"
 362                                 "cpu family\t: PA-RISC %s\n",
 363                                  cpu, boot_cpu_data.family_name);
 364
 365                 seq_printf(m, "cpu\t\t: %s\n",  boot_cpu_data.cpu_name );
 366
 367                 /* cpu MHz */
 368                 seq_printf(m, "cpu MHz\t\t: %d.%06d\n",
 369                                  boot_cpu_data.cpu_hz / 1000000,
 370                                  boot_cpu_data.cpu_hz % 1000000  );
 371
 372                 seq_printf(m, "capabilities\t:");
 373                 if (boot_cpu_data.pdc.capabilities & PDC_MODEL_OS32)
 374                         seq_printf(m, " os32");
 375                 if (boot_cpu_data.pdc.capabilities & PDC_MODEL_OS64)
 376                         seq_printf(m, " os64");
 377                 seq_printf(m, "\n");
 378
 379                 seq_printf(m, "model\t\t: %s\n"
 380                                 "model name\t: %s\n",
 381                                  boot_cpu_data.pdc.sys_model_name,
 382                                  cpuinfo->dev ?
 383                                  cpuinfo->dev->name : "Unknown");
 384
 385                 seq_printf(m, "hversion\t: 0x%08x\n"
 386                                 "sversion\t: 0x%08x\n",
 387                                  boot_cpu_data.hversion,
 388                                  boot_cpu_data.sversion );
 389
 390                 /* print cachesize info */
 391                 show_cache_info(m);
 392
 393                 seq_printf(m, "bogomips\t: %lu.%02lu\n",
 394                              cpuinfo->loops_per_jiffy / (500000 / HZ),
 395                              (cpuinfo->loops_per_jiffy / (5000 / HZ)) % 100);
 396
 397                 seq_printf(m, "software id\t: %ld\n\n",
 398                                 boot_cpu_data.pdc.model.sw_id);
 399         }
 400         return 0;
 401 }
 402
 403 static const struct parisc_device_id processor_tbl[] = {
 404         { HPHW_NPROC, HVERSION_REV_ANY_ID, HVERSION_ANY_ID, SVERSION_ANY_ID },
 405         { 0, }
 406 };
 407
 408 static struct parisc_driver cpu_driver = {
 409         .name           = "CPU",
 410         .id_table       = processor_tbl,
 411         .probe          = processor_probe
 412 };
 413
 414 /**
 415  * processor_init - Processor initialization procedure.
 416  *
 417  * Register this driver.
 418  */
 419 void __init processor_init(void)
 420 {
 421         register_parisc_driver(&cpu_driver);
 422 }