git.oblomov.eu Git - linux-2.6/blob - arch/x86/kernel/cpu/cpufreq/powernow-k8.c

   1 /*
   2  *   (c) 2003-2006 Advanced Micro Devices, Inc.
   3  *  Your use of this code is subject to the terms and conditions of the
   4  *  GNU general public license version 2. See "COPYING" or
   5  *  http://www.gnu.org/licenses/gpl.html
   6  *
   7  *  Support : mark.langsdorf@amd.com
   8  *
   9  *  Based on the powernow-k7.c module written by Dave Jones.
  10  *  (C) 2003 Dave Jones on behalf of SuSE Labs
  11  *  (C) 2004 Dominik Brodowski <linux@brodo.de>
  12  *  (C) 2004 Pavel Machek <pavel@suse.cz>
  13  *  Licensed under the terms of the GNU GPL License version 2.
  14  *  Based upon datasheets & sample CPUs kindly provided by AMD.
  15  *
  16  *  Valuable input gratefully received from Dave Jones, Pavel Machek,
  17  *  Dominik Brodowski, Jacob Shin, and others.
  18  *  Originally developed by Paul Devriendt.
  19  *  Processor information obtained from Chapter 9 (Power and Thermal Management)
  20  *  of the "BIOS and Kernel Developer's Guide for the AMD Athlon 64 and AMD
  21  *  Opteron Processors" available for download from www.amd.com
  22  *
  23  *  Tables for specific CPUs can be inferred from
  24  *     http://www.amd.com/us-en/assets/content_type/white_papers_and_tech_docs/30430.pdf
  25  */
  26
  27 #include <linux/kernel.h>
  28 #include <linux/smp.h>
  29 #include <linux/module.h>
  30 #include <linux/init.h>
  31 #include <linux/cpufreq.h>
  32 #include <linux/slab.h>
  33 #include <linux/string.h>
  34 #include <linux/cpumask.h>
  35 #include <linux/sched.h>        /* for current / set_cpus_allowed() */
  36 #include <linux/io.h>
  37 #include <linux/delay.h>
  38
  39 #include <asm/msr.h>
  40
  41 #include <linux/acpi.h>
  42 #include <linux/mutex.h>
  43 #include <acpi/processor.h>
  44
  45 #define PFX "powernow-k8: "
  46 #define VERSION "version 2.20.00"
  47 #include "powernow-k8.h"
  48
  49 /* serialize freq changes  */
  50 static DEFINE_MUTEX(fidvid_mutex);
  51
  52 static DEFINE_PER_CPU(struct powernow_k8_data *, powernow_data);
  53
  54 static int cpu_family = CPU_OPTERON;
  55
  56 #ifndef CONFIG_SMP
  57 DEFINE_PER_CPU(cpumask_t, cpu_core_map);
  58 #endif
  59
  60 /* Return a frequency in MHz, given an input fid */
  61 static u32 find_freq_from_fid(u32 fid)
  62 {
  63         return 800 + (fid * 100);
  64 }
  65
  66 /* Return a frequency in KHz, given an input fid */
  67 static u32 find_khz_freq_from_fid(u32 fid)
  68 {
  69         return 1000 * find_freq_from_fid(fid);
  70 }
  71
  72 static u32 find_khz_freq_from_pstate(struct cpufreq_frequency_table *data,
  73                 u32 pstate)
  74 {
  75         return data[pstate].frequency;
  76 }
  77
  78 /* Return the vco fid for an input fid
  79  *
  80  * Each "low" fid has corresponding "high" fid, and you can get to "low" fids
  81  * only from corresponding high fids. This returns "high" fid corresponding to
  82  * "low" one.
  83  */
  84 static u32 convert_fid_to_vco_fid(u32 fid)
  85 {
  86         if (fid < HI_FID_TABLE_BOTTOM)
  87                 return 8 + (2 * fid);
  88         else
  89                 return fid;
  90 }
  91
  92 /*
  93  * Return 1 if the pending bit is set. Unless we just instructed the processor
  94  * to transition to a new state, seeing this bit set is really bad news.
  95  */
  96 static int pending_bit_stuck(void)
  97 {
  98         u32 lo, hi;
  99
 100         if (cpu_family == CPU_HW_PSTATE)
 101                 return 0;
 102
 103         rdmsr(MSR_FIDVID_STATUS, lo, hi);
 104         return lo & MSR_S_LO_CHANGE_PENDING ? 1 : 0;
 105 }
 106
 107 /*
 108  * Update the global current fid / vid values from the status msr.
 109  * Returns 1 on error.
 110  */
 111 static int query_current_values_with_pending_wait(struct powernow_k8_data *data)
 112 {
 113         u32 lo, hi;
 114         u32 i = 0;
 115
 116         if (cpu_family == CPU_HW_PSTATE) {
 117                 if (data->currpstate == HW_PSTATE_INVALID) {
 118                         /* read (initial) hw pstate if not yet set */
 119                         rdmsr(MSR_PSTATE_STATUS, lo, hi);
 120                         i = lo & HW_PSTATE_MASK;
 121
 122                         /*
 123                          * a workaround for family 11h erratum 311 might cause
 124                          * an "out-of-range Pstate if the core is in Pstate-0
 125                          */
 126                         if (i >= data->numps)
 127                                 data->currpstate = HW_PSTATE_0;
 128                         else
 129                                 data->currpstate = i;
 130                 }
 131                 return 0;
 132         }
 133         do {
 134                 if (i++ > 10000) {
 135                         dprintk("detected change pending stuck\n");
 136                         return 1;
 137                 }
 138                 rdmsr(MSR_FIDVID_STATUS, lo, hi);
 139         } while (lo & MSR_S_LO_CHANGE_PENDING);
 140
 141         data->currvid = hi & MSR_S_HI_CURRENT_VID;
 142         data->currfid = lo & MSR_S_LO_CURRENT_FID;
 143
 144         return 0;
 145 }
 146
 147 /* the isochronous relief time */
 148 static void count_off_irt(struct powernow_k8_data *data)
 149 {
 150         udelay((1 << data->irt) * 10);
 151         return;
 152 }
 153
 154 /* the voltage stabilization time */
 155 static void count_off_vst(struct powernow_k8_data *data)
 156 {
 157         udelay(data->vstable * VST_UNITS_20US);
 158         return;
 159 }
 160
 161 /* need to init the control msr to a safe value (for each cpu) */
 162 static void fidvid_msr_init(void)
 163 {
 164         u32 lo, hi;
 165         u8 fid, vid;
 166
 167         rdmsr(MSR_FIDVID_STATUS, lo, hi);
 168         vid = hi & MSR_S_HI_CURRENT_VID;
 169         fid = lo & MSR_S_LO_CURRENT_FID;
 170         lo = fid | (vid << MSR_C_LO_VID_SHIFT);
 171         hi = MSR_C_HI_STP_GNT_BENIGN;
 172         dprintk("cpu%d, init lo 0x%x, hi 0x%x\n", smp_processor_id(), lo, hi);
 173         wrmsr(MSR_FIDVID_CTL, lo, hi);
 174 }
 175
 176 /* write the new fid value along with the other control fields to the msr */
 177 static int write_new_fid(struct powernow_k8_data *data, u32 fid)
 178 {
 179         u32 lo;
 180         u32 savevid = data->currvid;
 181         u32 i = 0;
 182
 183         if ((fid & INVALID_FID_MASK) || (data->currvid & INVALID_VID_MASK)) {
 184                 printk(KERN_ERR PFX "internal error - overflow on fid write\n");
 185                 return 1;
 186         }
 187
 188         lo = fid;
 189         lo |= (data->currvid << MSR_C_LO_VID_SHIFT);
 190         lo |= MSR_C_LO_INIT_FID_VID;
 191
 192         dprintk("writing fid 0x%x, lo 0x%x, hi 0x%x\n",
 193                 fid, lo, data->plllock * PLL_LOCK_CONVERSION);
 194
 195         do {
 196                 wrmsr(MSR_FIDVID_CTL, lo, data->plllock * PLL_LOCK_CONVERSION);
 197                 if (i++ > 100) {
 198                         printk(KERN_ERR PFX
 199                                 "Hardware error - pending bit very stuck - "
 200                                 "no further pstate changes possible\n");
 201                         return 1;
 202                 }
 203         } while (query_current_values_with_pending_wait(data));
 204
 205         count_off_irt(data);
 206
 207         if (savevid != data->currvid) {
 208                 printk(KERN_ERR PFX
 209                         "vid change on fid trans, old 0x%x, new 0x%x\n",
 210                         savevid, data->currvid);
 211                 return 1;
 212         }
 213
 214         if (fid != data->currfid) {
 215                 printk(KERN_ERR PFX
 216                         "fid trans failed, fid 0x%x, curr 0x%x\n", fid,
 217                         data->currfid);
 218                 return 1;
 219         }
 220
 221         return 0;
 222 }
 223
 224 /* Write a new vid to the hardware */
 225 static int write_new_vid(struct powernow_k8_data *data, u32 vid)
 226 {
 227         u32 lo;
 228         u32 savefid = data->currfid;
 229         int i = 0;
 230
 231         if ((data->currfid & INVALID_FID_MASK) || (vid & INVALID_VID_MASK)) {
 232                 printk(KERN_ERR PFX "internal error - overflow on vid write\n");
 233                 return 1;
 234         }
 235
 236         lo = data->currfid;
 237         lo |= (vid << MSR_C_LO_VID_SHIFT);
 238         lo |= MSR_C_LO_INIT_FID_VID;
 239
 240         dprintk("writing vid 0x%x, lo 0x%x, hi 0x%x\n",
 241                 vid, lo, STOP_GRANT_5NS);
 242
 243         do {
 244                 wrmsr(MSR_FIDVID_CTL, lo, STOP_GRANT_5NS);
 245                 if (i++ > 100) {
 246                         printk(KERN_ERR PFX "internal error - pending bit "
 247                                         "very stuck - no further pstate "
 248                                         "changes possible\n");
 249                         return 1;
 250                 }
 251         } while (query_current_values_with_pending_wait(data));
 252
 253         if (savefid != data->currfid) {
 254                 printk(KERN_ERR PFX "fid changed on vid trans, old "
 255                         "0x%x new 0x%x\n",
 256                        savefid, data->currfid);
 257                 return 1;
 258         }
 259
 260         if (vid != data->currvid) {
 261                 printk(KERN_ERR PFX "vid trans failed, vid 0x%x, "
 262                                 "curr 0x%x\n",
 263                                 vid, data->currvid);
 264                 return 1;
 265         }
 266
 267         return 0;
 268 }
 269
 270 /*
 271  * Reduce the vid by the max of step or reqvid.
 272  * Decreasing vid codes represent increasing voltages:
 273  * vid of 0 is 1.550V, vid of 0x1e is 0.800V, vid of VID_OFF is off.
 274  */
 275 static int decrease_vid_code_by_step(struct powernow_k8_data *data,
 276                 u32 reqvid, u32 step)
 277 {
 278         if ((data->currvid - reqvid) > step)
 279                 reqvid = data->currvid - step;
 280
 281         if (write_new_vid(data, reqvid))
 282                 return 1;
 283
 284         count_off_vst(data);
 285
 286         return 0;
 287 }
 288
 289 /* Change hardware pstate by single MSR write */
 290 static int transition_pstate(struct powernow_k8_data *data, u32 pstate)
 291 {
 292         wrmsr(MSR_PSTATE_CTRL, pstate, 0);
 293         data->currpstate = pstate;
 294         return 0;
 295 }
 296
 297 /* Change Opteron/Athlon64 fid and vid, by the 3 phases. */
 298 static int transition_fid_vid(struct powernow_k8_data *data,
 299                 u32 reqfid, u32 reqvid)
 300 {
 301         if (core_voltage_pre_transition(data, reqvid))
 302                 return 1;
 303
 304         if (core_frequency_transition(data, reqfid))
 305                 return 1;
 306
 307         if (core_voltage_post_transition(data, reqvid))
 308                 return 1;
 309
 310         if (query_current_values_with_pending_wait(data))
 311                 return 1;
 312
 313         if ((reqfid != data->currfid) || (reqvid != data->currvid)) {
 314                 printk(KERN_ERR PFX "failed (cpu%d): req 0x%x 0x%x, "
 315                                 "curr 0x%x 0x%x\n",
 316                                 smp_processor_id(),
 317                                 reqfid, reqvid, data->currfid, data->currvid);
 318                 return 1;
 319         }
 320
 321         dprintk("transitioned (cpu%d): new fid 0x%x, vid 0x%x\n",
 322                 smp_processor_id(), data->currfid, data->currvid);
 323
 324         return 0;
 325 }
 326
 327 /* Phase 1 - core voltage transition ... setup voltage */
 328 static int core_voltage_pre_transition(struct powernow_k8_data *data,
 329                 u32 reqvid)
 330 {
 331         u32 rvosteps = data->rvo;
 332         u32 savefid = data->currfid;
 333         u32 maxvid, lo;
 334
 335         dprintk("ph1 (cpu%d): start, currfid 0x%x, currvid 0x%x, "
 336                 "reqvid 0x%x, rvo 0x%x\n",
 337                 smp_processor_id(),
 338                 data->currfid, data->currvid, reqvid, data->rvo);
 339
 340         rdmsr(MSR_FIDVID_STATUS, lo, maxvid);
 341         maxvid = 0x1f & (maxvid >> 16);
 342         dprintk("ph1 maxvid=0x%x\n", maxvid);
 343         if (reqvid < maxvid) /* lower numbers are higher voltages */
 344                 reqvid = maxvid;
 345
 346         while (data->currvid > reqvid) {
 347                 dprintk("ph1: curr 0x%x, req vid 0x%x\n",
 348                         data->currvid, reqvid);
 349                 if (decrease_vid_code_by_step(data, reqvid, data->vidmvs))
 350                         return 1;
 351         }
 352
 353         while ((rvosteps > 0) && ((data->rvo + data->currvid) > reqvid)) {
 354                 if (data->currvid == maxvid) {
 355                         rvosteps = 0;
 356                 } else {
 357                         dprintk("ph1: changing vid for rvo, req 0x%x\n",
 358                                 data->currvid - 1);
 359                         if (decrease_vid_code_by_step(data, data->currvid-1, 1))
 360                                 return 1;
 361                         rvosteps--;
 362                 }
 363         }
 364
 365         if (query_current_values_with_pending_wait(data))
 366                 return 1;
 367
 368         if (savefid != data->currfid) {
 369                 printk(KERN_ERR PFX "ph1 err, currfid changed 0x%x\n",
 370                                 data->currfid);
 371                 return 1;
 372         }
 373
 374         dprintk("ph1 complete, currfid 0x%x, currvid 0x%x\n",
 375                 data->currfid, data->currvid);
 376
 377         return 0;
 378 }
 379
 380 /* Phase 2 - core frequency transition */
 381 static int core_frequency_transition(struct powernow_k8_data *data, u32 reqfid)
 382 {
 383         u32 vcoreqfid, vcocurrfid, vcofiddiff;
 384         u32 fid_interval, savevid = data->currvid;
 385
 386         if ((reqfid < HI_FID_TABLE_BOTTOM) &&
 387             (data->currfid < HI_FID_TABLE_BOTTOM)) {
 388                 printk(KERN_ERR PFX "ph2: illegal lo-lo transition "
 389                                 "0x%x 0x%x\n", reqfid, data->currfid);
 390                 return 1;
 391         }
 392
 393         if (data->currfid == reqfid) {
 394                 printk(KERN_ERR PFX "ph2 null fid transition 0x%x\n",
 395                                 data->currfid);
 396                 return 0;
 397         }
 398
 399         dprintk("ph2 (cpu%d): starting, currfid 0x%x, currvid 0x%x, "
 400                 "reqfid 0x%x\n",
 401                 smp_processor_id(),
 402                 data->currfid, data->currvid, reqfid);
 403
 404         vcoreqfid = convert_fid_to_vco_fid(reqfid);
 405         vcocurrfid = convert_fid_to_vco_fid(data->currfid);
 406         vcofiddiff = vcocurrfid > vcoreqfid ? vcocurrfid - vcoreqfid
 407             : vcoreqfid - vcocurrfid;
 408
 409         while (vcofiddiff > 2) {
 410                 (data->currfid & 1) ? (fid_interval = 1) : (fid_interval = 2);
 411
 412                 if (reqfid > data->currfid) {
 413                         if (data->currfid > LO_FID_TABLE_TOP) {
 414                                 if (write_new_fid(data,
 415                                                 data->currfid + fid_interval))
 416                                         return 1;
 417                         } else {
 418                                 if (write_new_fid
 419                                     (data,
 420                                      2 + convert_fid_to_vco_fid(data->currfid)))
 421                                         return 1;
 422                         }
 423                 } else {
 424                         if (write_new_fid(data, data->currfid - fid_interval))
 425                                 return 1;
 426                 }
 427
 428                 vcocurrfid = convert_fid_to_vco_fid(data->currfid);
 429                 vcofiddiff = vcocurrfid > vcoreqfid ? vcocurrfid - vcoreqfid
 430                     : vcoreqfid - vcocurrfid;
 431         }
 432
 433         if (write_new_fid(data, reqfid))
 434                 return 1;
 435
 436         if (query_current_values_with_pending_wait(data))
 437                 return 1;
 438
 439         if (data->currfid != reqfid) {
 440                 printk(KERN_ERR PFX
 441                         "ph2: mismatch, failed fid transition, "
 442                         "curr 0x%x, req 0x%x\n",
 443                         data->currfid, reqfid);
 444                 return 1;
 445         }
 446
 447         if (savevid != data->currvid) {
 448                 printk(KERN_ERR PFX "ph2: vid changed, save 0x%x, curr 0x%x\n",
 449                         savevid, data->currvid);
 450                 return 1;
 451         }
 452
 453         dprintk("ph2 complete, currfid 0x%x, currvid 0x%x\n",
 454                 data->currfid, data->currvid);
 455
 456         return 0;
 457 }
 458
 459 /* Phase 3 - core voltage transition flow ... jump to the final vid. */
 460 static int core_voltage_post_transition(struct powernow_k8_data *data,
 461                 u32 reqvid)
 462 {
 463         u32 savefid = data->currfid;
 464         u32 savereqvid = reqvid;
 465
 466         dprintk("ph3 (cpu%d): starting, currfid 0x%x, currvid 0x%x\n",
 467                 smp_processor_id(),
 468                 data->currfid, data->currvid);
 469
 470         if (reqvid != data->currvid) {
 471                 if (write_new_vid(data, reqvid))
 472                         return 1;
 473
 474                 if (savefid != data->currfid) {
 475                         printk(KERN_ERR PFX
 476                                "ph3: bad fid change, save 0x%x, curr 0x%x\n",
 477                                savefid, data->currfid);
 478                         return 1;
 479                 }
 480
 481                 if (data->currvid != reqvid) {
 482                         printk(KERN_ERR PFX
 483                                "ph3: failed vid transition\n, "
 484                                "req 0x%x, curr 0x%x",
 485                                reqvid, data->currvid);
 486                         return 1;
 487                 }
 488         }
 489
 490         if (query_current_values_with_pending_wait(data))
 491                 return 1;
 492
 493         if (savereqvid != data->currvid) {
 494                 dprintk("ph3 failed, currvid 0x%x\n", data->currvid);
 495                 return 1;
 496         }
 497
 498         if (savefid != data->currfid) {
 499                 dprintk("ph3 failed, currfid changed 0x%x\n",
 500                         data->currfid);
 501                 return 1;
 502         }
 503
 504         dprintk("ph3 complete, currfid 0x%x, currvid 0x%x\n",
 505                 data->currfid, data->currvid);
 506
 507         return 0;
 508 }
 509
 510 static int check_supported_cpu(unsigned int cpu)
 511 {
 512         cpumask_t oldmask;
 513         u32 eax, ebx, ecx, edx;
 514         unsigned int rc = 0;
 515
 516         oldmask = current->cpus_allowed;
 517         set_cpus_allowed_ptr(current, &cpumask_of_cpu(cpu));
 518
 519         if (smp_processor_id() != cpu) {
 520                 printk(KERN_ERR PFX "limiting to cpu %u failed\n", cpu);
 521                 goto out;
 522         }
 523
 524         if (current_cpu_data.x86_vendor != X86_VENDOR_AMD)
 525                 goto out;
 526
 527         eax = cpuid_eax(CPUID_PROCESSOR_SIGNATURE);
 528         if (((eax & CPUID_XFAM) != CPUID_XFAM_K8) &&
 529             ((eax & CPUID_XFAM) < CPUID_XFAM_10H))
 530                 goto out;
 531
 532         if ((eax & CPUID_XFAM) == CPUID_XFAM_K8) {
 533                 if (((eax & CPUID_USE_XFAM_XMOD) != CPUID_USE_XFAM_XMOD) ||
 534                     ((eax & CPUID_XMOD) > CPUID_XMOD_REV_MASK)) {
 535                         printk(KERN_INFO PFX
 536                                 "Processor cpuid %x not supported\n", eax);
 537                         goto out;
 538                 }
 539
 540                 eax = cpuid_eax(CPUID_GET_MAX_CAPABILITIES);
 541                 if (eax < CPUID_FREQ_VOLT_CAPABILITIES) {
 542                         printk(KERN_INFO PFX
 543                                "No frequency change capabilities detected\n");
 544                         goto out;
 545                 }
 546
 547                 cpuid(CPUID_FREQ_VOLT_CAPABILITIES, &eax, &ebx, &ecx, &edx);
 548                 if ((edx & P_STATE_TRANSITION_CAPABLE)
 549                         != P_STATE_TRANSITION_CAPABLE) {
 550                         printk(KERN_INFO PFX
 551                                 "Power state transitions not supported\n");
 552                         goto out;
 553                 }
 554         } else { /* must be a HW Pstate capable processor */
 555                 cpuid(CPUID_FREQ_VOLT_CAPABILITIES, &eax, &ebx, &ecx, &edx);
 556                 if ((edx & USE_HW_PSTATE) == USE_HW_PSTATE)
 557                         cpu_family = CPU_HW_PSTATE;
 558                 else
 559                         goto out;
 560         }
 561
 562         rc = 1;
 563
 564 out:
 565         set_cpus_allowed_ptr(current, &oldmask);
 566         return rc;
 567 }
 568
 569 static int check_pst_table(struct powernow_k8_data *data, struct pst_s *pst,
 570                 u8 maxvid)
 571 {
 572         unsigned int j;
 573         u8 lastfid = 0xff;
 574
 575         for (j = 0; j < data->numps; j++) {
 576                 if (pst[j].vid > LEAST_VID) {
 577                         printk(KERN_ERR FW_BUG PFX "vid %d invalid : 0x%x\n",
 578                                j, pst[j].vid);
 579                         return -EINVAL;
 580                 }
 581                 if (pst[j].vid < data->rvo) {
 582                         /* vid + rvo >= 0 */
 583                         printk(KERN_ERR FW_BUG PFX "0 vid exceeded with pstate"
 584                                " %d\n", j);
 585                         return -ENODEV;
 586                 }
 587                 if (pst[j].vid < maxvid + data->rvo) {
 588                         /* vid + rvo >= maxvid */
 589                         printk(KERN_ERR FW_BUG PFX "maxvid exceeded with pstate"
 590                                " %d\n", j);
 591                         return -ENODEV;
 592                 }
 593                 if (pst[j].fid > MAX_FID) {
 594                         printk(KERN_ERR FW_BUG PFX "maxfid exceeded with pstate"
 595                                " %d\n", j);
 596                         return -ENODEV;
 597                 }
 598                 if (j && (pst[j].fid < HI_FID_TABLE_BOTTOM)) {
 599                         /* Only first fid is allowed to be in "low" range */
 600                         printk(KERN_ERR FW_BUG PFX "two low fids - %d : "
 601                                "0x%x\n", j, pst[j].fid);
 602                         return -EINVAL;
 603                 }
 604                 if (pst[j].fid < lastfid)
 605                         lastfid = pst[j].fid;
 606         }
 607         if (lastfid & 1) {
 608                 printk(KERN_ERR FW_BUG PFX "lastfid invalid\n");
 609                 return -EINVAL;
 610         }
 611         if (lastfid > LO_FID_TABLE_TOP)
 612                 printk(KERN_INFO FW_BUG PFX
 613                         "first fid not from lo freq table\n");
 614
 615         return 0;
 616 }
 617
 618 static void invalidate_entry(struct powernow_k8_data *data, unsigned int entry)
 619 {
 620         data->powernow_table[entry].frequency = CPUFREQ_ENTRY_INVALID;
 621 }
 622
 623 static void print_basics(struct powernow_k8_data *data)
 624 {
 625         int j;
 626         for (j = 0; j < data->numps; j++) {
 627                 if (data->powernow_table[j].frequency !=
 628                                 CPUFREQ_ENTRY_INVALID) {
 629                         if (cpu_family == CPU_HW_PSTATE) {
 630                                 printk(KERN_INFO PFX
 631                                         "   %d : pstate %d (%d MHz)\n", j,
 632                                         data->powernow_table[j].index,
 633                                         data->powernow_table[j].frequency/1000);
 634                         } else {
 635                                 printk(KERN_INFO PFX
 636                                         "   %d : fid 0x%x (%d MHz), vid 0x%x\n",
 637                                         j,
 638                                         data->powernow_table[j].index & 0xff,
 639                                         data->powernow_table[j].frequency/1000,
 640                                         data->powernow_table[j].index >> 8);
 641                         }
 642                 }
 643         }
 644         if (data->batps)
 645                 printk(KERN_INFO PFX "Only %d pstates on battery\n",
 646                                 data->batps);
 647 }
 648
 649 static int fill_powernow_table(struct powernow_k8_data *data,
 650                 struct pst_s *pst, u8 maxvid)
 651 {
 652         struct cpufreq_frequency_table *powernow_table;
 653         unsigned int j;
 654
 655         if (data->batps) {
 656                 /* use ACPI support to get full speed on mains power */
 657                 printk(KERN_WARNING PFX
 658                         "Only %d pstates usable (use ACPI driver for full "
 659                         "range\n", data->batps);
 660                 data->numps = data->batps;
 661         }
 662
 663         for (j = 1; j < data->numps; j++) {
 664                 if (pst[j-1].fid >= pst[j].fid) {
 665                         printk(KERN_ERR PFX "PST out of sequence\n");
 666                         return -EINVAL;
 667                 }
 668         }
 669
 670         if (data->numps < 2) {
 671                 printk(KERN_ERR PFX "no p states to transition\n");
 672                 return -ENODEV;
 673         }
 674
 675         if (check_pst_table(data, pst, maxvid))
 676                 return -EINVAL;
 677
 678         powernow_table = kmalloc((sizeof(struct cpufreq_frequency_table)
 679                 * (data->numps + 1)), GFP_KERNEL);
 680         if (!powernow_table) {
 681                 printk(KERN_ERR PFX "powernow_table memory alloc failure\n");
 682                 return -ENOMEM;
 683         }
 684
 685         for (j = 0; j < data->numps; j++) {
 686                 int freq;
 687                 powernow_table[j].index = pst[j].fid; /* lower 8 bits */
 688                 powernow_table[j].index |= (pst[j].vid << 8); /* upper 8 bits */
 689                 freq = find_khz_freq_from_fid(pst[j].fid);
 690                 powernow_table[j].frequency = freq;
 691         }
 692         powernow_table[data->numps].frequency = CPUFREQ_TABLE_END;
 693         powernow_table[data->numps].index = 0;
 694
 695         if (query_current_values_with_pending_wait(data)) {
 696                 kfree(powernow_table);
 697                 return -EIO;
 698         }
 699
 700         dprintk("cfid 0x%x, cvid 0x%x\n", data->currfid, data->currvid);
 701         data->powernow_table = powernow_table;
 702         if (first_cpu(per_cpu(cpu_core_map, data->cpu)) == data->cpu)
 703                 print_basics(data);
 704
 705         for (j = 0; j < data->numps; j++)
 706                 if ((pst[j].fid == data->currfid) &&
 707                     (pst[j].vid == data->currvid))
 708                         return 0;
 709
 710         dprintk("currfid/vid do not match PST, ignoring\n");
 711         return 0;
 712 }
 713
 714 /* Find and validate the PSB/PST table in BIOS. */
 715 static int find_psb_table(struct powernow_k8_data *data)
 716 {
 717         struct psb_s *psb;
 718         unsigned int i;
 719         u32 mvs;
 720         u8 maxvid;
 721         u32 cpst = 0;
 722         u32 thiscpuid;
 723
 724         for (i = 0xc0000; i < 0xffff0; i += 0x10) {
 725                 /* Scan BIOS looking for the signature. */
 726                 /* It can not be at ffff0 - it is too big. */
 727
 728                 psb = phys_to_virt(i);
 729                 if (memcmp(psb, PSB_ID_STRING, PSB_ID_STRING_LEN) != 0)
 730                         continue;
 731
 732                 dprintk("found PSB header at 0x%p\n", psb);
 733
 734                 dprintk("table vers: 0x%x\n", psb->tableversion);
 735                 if (psb->tableversion != PSB_VERSION_1_4) {
 736                         printk(KERN_ERR FW_BUG PFX "PSB table is not v1.4\n");
 737                         return -ENODEV;
 738                 }
 739
 740                 dprintk("flags: 0x%x\n", psb->flags1);
 741                 if (psb->flags1) {
 742                         printk(KERN_ERR FW_BUG PFX "unknown flags\n");
 743                         return -ENODEV;
 744                 }
 745
 746                 data->vstable = psb->vstable;
 747                 dprintk("voltage stabilization time: %d(*20us)\n",
 748                                 data->vstable);
 749
 750                 dprintk("flags2: 0x%x\n", psb->flags2);
 751                 data->rvo = psb->flags2 & 3;
 752                 data->irt = ((psb->flags2) >> 2) & 3;
 753                 mvs = ((psb->flags2) >> 4) & 3;
 754                 data->vidmvs = 1 << mvs;
 755                 data->batps = ((psb->flags2) >> 6) & 3;
 756
 757                 dprintk("ramp voltage offset: %d\n", data->rvo);
 758                 dprintk("isochronous relief time: %d\n", data->irt);
 759                 dprintk("maximum voltage step: %d - 0x%x\n", mvs, data->vidmvs);
 760
 761                 dprintk("numpst: 0x%x\n", psb->num_tables);
 762                 cpst = psb->num_tables;
 763                 if ((psb->cpuid == 0x00000fc0) ||
 764                     (psb->cpuid == 0x00000fe0)) {
 765                         thiscpuid = cpuid_eax(CPUID_PROCESSOR_SIGNATURE);
 766                         if ((thiscpuid == 0x00000fc0) ||
 767                             (thiscpuid == 0x00000fe0))
 768                                 cpst = 1;
 769                 }
 770                 if (cpst != 1) {
 771                         printk(KERN_ERR FW_BUG PFX "numpst must be 1\n");
 772                         return -ENODEV;
 773                 }
 774
 775                 data->plllock = psb->plllocktime;
 776                 dprintk("plllocktime: 0x%x (units 1us)\n", psb->plllocktime);
 777                 dprintk("maxfid: 0x%x\n", psb->maxfid);
 778                 dprintk("maxvid: 0x%x\n", psb->maxvid);
 779                 maxvid = psb->maxvid;
 780
 781                 data->numps = psb->numps;
 782                 dprintk("numpstates: 0x%x\n", data->numps);
 783                 return fill_powernow_table(data,
 784                                 (struct pst_s *)(psb+1), maxvid);
 785         }
 786         /*
 787          * If you see this message, complain to BIOS manufacturer. If
 788          * he tells you "we do not support Linux" or some similar
 789          * nonsense, remember that Windows 2000 uses the same legacy
 790          * mechanism that the old Linux PSB driver uses. Tell them it
 791          * is broken with Windows 2000.
 792          *
 793          * The reference to the AMD documentation is chapter 9 in the
 794          * BIOS and Kernel Developer's Guide, which is available on
 795          * www.amd.com
 796          */
 797         printk(KERN_ERR FW_BUG PFX "No PSB or ACPI _PSS objects\n");
 798         return -ENODEV;
 799 }
 800
 801 static void powernow_k8_acpi_pst_values(struct powernow_k8_data *data,
 802                 unsigned int index)
 803 {
 804         acpi_integer control;
 805
 806         if (!data->acpi_data.state_count || (cpu_family == CPU_HW_PSTATE))
 807                 return;
 808
 809         control = data->acpi_data.states[index].control; data->irt = (control
 810                         >> IRT_SHIFT) & IRT_MASK; data->rvo = (control >>
 811                                 RVO_SHIFT) & RVO_MASK; data->exttype = (control
 812                                         >> EXT_TYPE_SHIFT) & EXT_TYPE_MASK;
 813         data->plllock = (control >> PLL_L_SHIFT) & PLL_L_MASK; data->vidmvs = 1
 814                 << ((control >> MVS_SHIFT) & MVS_MASK); data->vstable =
 815                 (control >> VST_SHIFT) & VST_MASK; }
 816
 817 static int powernow_k8_cpu_init_acpi(struct powernow_k8_data *data)
 818 {
 819         struct cpufreq_frequency_table *powernow_table;
 820         int ret_val = -ENODEV;
 821         acpi_integer space_id;
 822
 823         if (acpi_processor_register_performance(&data->acpi_data, data->cpu)) {
 824                 dprintk("register performance failed: bad ACPI data\n");
 825                 return -EIO;
 826         }
 827
 828         /* verify the data contained in the ACPI structures */
 829         if (data->acpi_data.state_count <= 1) {
 830                 dprintk("No ACPI P-States\n");
 831                 goto err_out;
 832         }
 833
 834         space_id = data->acpi_data.control_register.space_id;
 835         if ((space_id != ACPI_ADR_SPACE_FIXED_HARDWARE) ||
 836                 (space_id != ACPI_ADR_SPACE_FIXED_HARDWARE)) {
 837                 dprintk("Invalid control/status registers (%x - %x)\n",
 838                         data->acpi_data.control_register.space_id,
 839                         space_id);
 840                 goto err_out;
 841         }
 842
 843         /* fill in data->powernow_table */
 844         powernow_table = kmalloc((sizeof(struct cpufreq_frequency_table)
 845                 * (data->acpi_data.state_count + 1)), GFP_KERNEL);
 846         if (!powernow_table) {
 847                 dprintk("powernow_table memory alloc failure\n");
 848                 goto err_out;
 849         }
 850
 851         if (cpu_family == CPU_HW_PSTATE)
 852                 ret_val = fill_powernow_table_pstate(data, powernow_table);
 853         else
 854                 ret_val = fill_powernow_table_fidvid(data, powernow_table);
 855         if (ret_val)
 856                 goto err_out_mem;
 857
 858         powernow_table[data->acpi_data.state_count].frequency =
 859                 CPUFREQ_TABLE_END;
 860         powernow_table[data->acpi_data.state_count].index = 0;
 861         data->powernow_table = powernow_table;
 862
 863         /* fill in data */
 864         data->numps = data->acpi_data.state_count;
 865         if (first_cpu(per_cpu(cpu_core_map, data->cpu)) == data->cpu)
 866                 print_basics(data);
 867         powernow_k8_acpi_pst_values(data, 0);
 868
 869         /* notify BIOS that we exist */
 870         acpi_processor_notify_smm(THIS_MODULE);
 871
 872         if (!alloc_cpumask_var(&data->acpi_data.shared_cpu_map, GFP_KERNEL)) {
 873                 printk(KERN_ERR PFX
 874                                 "unable to alloc powernow_k8_data cpumask\n");
 875                 ret_val = -ENOMEM;
 876                 goto err_out_mem;
 877         }
 878
 879         return 0;
 880
 881 err_out_mem:
 882         kfree(powernow_table);
 883
 884 err_out:
 885         acpi_processor_unregister_performance(&data->acpi_data, data->cpu);
 886
 887         /* data->acpi_data.state_count informs us at ->exit()
 888          * whether ACPI was used */
 889         data->acpi_data.state_count = 0;
 890
 891         return ret_val;
 892 }
 893
 894 static int fill_powernow_table_pstate(struct powernow_k8_data *data,
 895                 struct cpufreq_frequency_table *powernow_table)
 896 {
 897         int i;
 898         u32 hi = 0, lo = 0;
 899         rdmsr(MSR_PSTATE_CUR_LIMIT, hi, lo);
 900         data->max_hw_pstate = (hi & HW_PSTATE_MAX_MASK) >> HW_PSTATE_MAX_SHIFT;
 901
 902         for (i = 0; i < data->acpi_data.state_count; i++) {
 903                 u32 index;
 904
 905                 index = data->acpi_data.states[i].control & HW_PSTATE_MASK;
 906                 if (index > data->max_hw_pstate) {
 907                         printk(KERN_ERR PFX "invalid pstate %d - "
 908                                         "bad value %d.\n", i, index);
 909                         printk(KERN_ERR PFX "Please report to BIOS "
 910                                         "manufacturer\n");
 911                         invalidate_entry(data, i);
 912                         continue;
 913                 }
 914                 rdmsr(MSR_PSTATE_DEF_BASE + index, lo, hi);
 915                 if (!(hi & HW_PSTATE_VALID_MASK)) {
 916                         dprintk("invalid pstate %d, ignoring\n", index);
 917                         invalidate_entry(data, i);
 918                         continue;
 919                 }
 920
 921                 powernow_table[i].index = index;
 922
 923                 powernow_table[i].frequency =
 924                         data->acpi_data.states[i].core_frequency * 1000;
 925         }
 926         return 0;
 927 }
 928
 929 static int fill_powernow_table_fidvid(struct powernow_k8_data *data,
 930                 struct cpufreq_frequency_table *powernow_table)
 931 {
 932         int i;
 933         int cntlofreq = 0;
 934
 935         for (i = 0; i < data->acpi_data.state_count; i++) {
 936                 u32 fid;
 937                 u32 vid;
 938                 u32 freq, index;
 939                 acpi_integer status, control;
 940
 941                 if (data->exttype) {
 942                         status =  data->acpi_data.states[i].status;
 943                         fid = status & EXT_FID_MASK;
 944                         vid = (status >> VID_SHIFT) & EXT_VID_MASK;
 945                 } else {
 946                         control =  data->acpi_data.states[i].control;
 947                         fid = control & FID_MASK;
 948                         vid = (control >> VID_SHIFT) & VID_MASK;
 949                 }
 950
 951                 dprintk("   %d : fid 0x%x, vid 0x%x\n", i, fid, vid);
 952
 953                 index = fid | (vid<<8);
 954                 powernow_table[i].index = index;
 955
 956                 freq = find_khz_freq_from_fid(fid);
 957                 powernow_table[i].frequency = freq;
 958
 959                 /* verify frequency is OK */
 960                 if ((freq > (MAX_FREQ * 1000)) || (freq < (MIN_FREQ * 1000))) {
 961                         dprintk("invalid freq %u kHz, ignoring\n", freq);
 962                         invalidate_entry(data, i);
 963                         continue;
 964                 }
 965
 966                 /* verify voltage is OK -
 967                  * BIOSs are using "off" to indicate invalid */
 968                 if (vid == VID_OFF) {
 969                         dprintk("invalid vid %u, ignoring\n", vid);
 970                         invalidate_entry(data, i);
 971                         continue;
 972                 }
 973
 974                 /* verify only 1 entry from the lo frequency table */
 975                 if (fid < HI_FID_TABLE_BOTTOM) {
 976                         if (cntlofreq) {
 977                                 /* if both entries are the same,
 978                                  * ignore this one ... */
 979                                 if ((freq != powernow_table[cntlofreq].frequency) ||
 980                                     (index != powernow_table[cntlofreq].index)) {
 981                                         printk(KERN_ERR PFX
 982                                                 "Too many lo freq table "
 983                                                 "entries\n");
 984                                         return 1;
 985                                 }
 986
 987                                 dprintk("double low frequency table entry, "
 988                                                 "ignoring it.\n");
 989                                 invalidate_entry(data, i);
 990                                 continue;
 991                         } else
 992                                 cntlofreq = i;
 993                 }
 994
 995                 if (freq != (data->acpi_data.states[i].core_frequency * 1000)) {
 996                         printk(KERN_INFO PFX "invalid freq entries "
 997                                 "%u kHz vs. %u kHz\n", freq,
 998                                 (unsigned int)
 999                                 (data->acpi_data.states[i].core_frequency
1000                                  * 1000));
1001                         invalidate_entry(data, i);
1002                         continue;
1003                 }
1004         }
1005         return 0;
1006 }
1007
1008 static void powernow_k8_cpu_exit_acpi(struct powernow_k8_data *data)
1009 {
1010         if (data->acpi_data.state_count)
1011                 acpi_processor_unregister_performance(&data->acpi_data,
1012                                 data->cpu);
1013         free_cpumask_var(data->acpi_data.shared_cpu_map);
1014 }
1015
1016 static int get_transition_latency(struct powernow_k8_data *data)
1017 {
1018         int max_latency = 0;
1019         int i;
1020         for (i = 0; i < data->acpi_data.state_count; i++) {
1021                 int cur_latency = data->acpi_data.states[i].transition_latency
1022                         + data->acpi_data.states[i].bus_master_latency;
1023                 if (cur_latency > max_latency)
1024                         max_latency = cur_latency;
1025         }
1026         /* value in usecs, needs to be in nanoseconds */
1027         return 1000 * max_latency;
1028 }
1029
1030 /* Take a frequency, and issue the fid/vid transition command */
1031 static int transition_frequency_fidvid(struct powernow_k8_data *data,
1032                 unsigned int index)
1033 {
1034         u32 fid = 0;
1035         u32 vid = 0;
1036         int res, i;
1037         struct cpufreq_freqs freqs;
1038
1039         dprintk("cpu %d transition to index %u\n", smp_processor_id(), index);
1040
1041         /* fid/vid correctness check for k8 */
1042         /* fid are the lower 8 bits of the index we stored into
1043          * the cpufreq frequency table in find_psb_table, vid
1044          * are the upper 8 bits.
1045          */
1046         fid = data->powernow_table[index].index & 0xFF;
1047         vid = (data->powernow_table[index].index & 0xFF00) >> 8;
1048
1049         dprintk("table matched fid 0x%x, giving vid 0x%x\n", fid, vid);
1050
1051         if (query_current_values_with_pending_wait(data))
1052                 return 1;
1053
1054         if ((data->currvid == vid) && (data->currfid == fid)) {
1055                 dprintk("target matches current values (fid 0x%x, vid 0x%x)\n",
1056                         fid, vid);
1057                 return 0;
1058         }
1059
1060         if ((fid < HI_FID_TABLE_BOTTOM) &&
1061             (data->currfid < HI_FID_TABLE_BOTTOM)) {
1062                 printk(KERN_ERR PFX
1063                        "ignoring illegal change in lo freq table-%x to 0x%x\n",
1064                        data->currfid, fid);
1065                 return 1;
1066         }
1067
1068         dprintk("cpu %d, changing to fid 0x%x, vid 0x%x\n",
1069                 smp_processor_id(), fid, vid);
1070         freqs.old = find_khz_freq_from_fid(data->currfid);
1071         freqs.new = find_khz_freq_from_fid(fid);
1072
1073         for_each_cpu_mask_nr(i, *(data->available_cores)) {
1074                 freqs.cpu = i;
1075                 cpufreq_notify_transition(&freqs, CPUFREQ_PRECHANGE);
1076         }
1077
1078         res = transition_fid_vid(data, fid, vid);
1079         freqs.new = find_khz_freq_from_fid(data->currfid);
1080
1081         for_each_cpu_mask_nr(i, *(data->available_cores)) {
1082                 freqs.cpu = i;
1083                 cpufreq_notify_transition(&freqs, CPUFREQ_POSTCHANGE);
1084         }
1085         return res;
1086 }
1087
1088 /* Take a frequency, and issue the hardware pstate transition command */
1089 static int transition_frequency_pstate(struct powernow_k8_data *data,
1090                 unsigned int index)
1091 {
1092         u32 pstate = 0;
1093         int res, i;
1094         struct cpufreq_freqs freqs;
1095
1096         dprintk("cpu %d transition to index %u\n", smp_processor_id(), index);
1097
1098         /* get MSR index for hardware pstate transition */
1099         pstate = index & HW_PSTATE_MASK;
1100         if (pstate > data->max_hw_pstate)
1101                 return 0;
1102         freqs.old = find_khz_freq_from_pstate(data->powernow_table,
1103                         data->currpstate);
1104         freqs.new = find_khz_freq_from_pstate(data->powernow_table, pstate);
1105
1106         for_each_cpu_mask_nr(i, *(data->available_cores)) {
1107                 freqs.cpu = i;
1108                 cpufreq_notify_transition(&freqs, CPUFREQ_PRECHANGE);
1109         }
1110
1111         res = transition_pstate(data, pstate);
1112         freqs.new = find_khz_freq_from_pstate(data->powernow_table, pstate);
1113
1114         for_each_cpu_mask_nr(i, *(data->available_cores)) {
1115                 freqs.cpu = i;
1116                 cpufreq_notify_transition(&freqs, CPUFREQ_POSTCHANGE);
1117         }
1118         return res;
1119 }
1120
1121 /* Driver entry point to switch to the target frequency */
1122 static int powernowk8_target(struct cpufreq_policy *pol,
1123                 unsigned targfreq, unsigned relation)
1124 {
1125         cpumask_t oldmask;
1126         struct powernow_k8_data *data = per_cpu(powernow_data, pol->cpu);
1127         u32 checkfid;
1128         u32 checkvid;
1129         unsigned int newstate;
1130         int ret = -EIO;
1131
1132         if (!data)
1133                 return -EINVAL;
1134
1135         checkfid = data->currfid;
1136         checkvid = data->currvid;
1137
1138         /* only run on specific CPU from here on */
1139         oldmask = current->cpus_allowed;
1140         set_cpus_allowed_ptr(current, &cpumask_of_cpu(pol->cpu));
1141
1142         if (smp_processor_id() != pol->cpu) {
1143                 printk(KERN_ERR PFX "limiting to cpu %u failed\n", pol->cpu);
1144                 goto err_out;
1145         }
1146
1147         if (pending_bit_stuck()) {
1148                 printk(KERN_ERR PFX "failing targ, change pending bit set\n");
1149                 goto err_out;
1150         }
1151
1152         dprintk("targ: cpu %d, %d kHz, min %d, max %d, relation %d\n",
1153                 pol->cpu, targfreq, pol->min, pol->max, relation);
1154
1155         if (query_current_values_with_pending_wait(data))
1156                 goto err_out;
1157
1158         if (cpu_family != CPU_HW_PSTATE) {
1159                 dprintk("targ: curr fid 0x%x, vid 0x%x\n",
1160                 data->currfid, data->currvid);
1161
1162                 if ((checkvid != data->currvid) ||
1163                     (checkfid != data->currfid)) {
1164                         printk(KERN_INFO PFX
1165                                 "error - out of sync, fix 0x%x 0x%x, "
1166                                 "vid 0x%x 0x%x\n",
1167                                 checkfid, data->currfid,
1168                                 checkvid, data->currvid);
1169                 }
1170         }
1171
1172         if (cpufreq_frequency_table_target(pol, data->powernow_table,
1173                                 targfreq, relation, &newstate))
1174                 goto err_out;
1175
1176         mutex_lock(&fidvid_mutex);
1177
1178         powernow_k8_acpi_pst_values(data, newstate);
1179
1180         if (cpu_family == CPU_HW_PSTATE)
1181                 ret = transition_frequency_pstate(data, newstate);
1182         else
1183                 ret = transition_frequency_fidvid(data, newstate);
1184         if (ret) {
1185                 printk(KERN_ERR PFX "transition frequency failed\n");
1186                 ret = 1;
1187                 mutex_unlock(&fidvid_mutex);
1188                 goto err_out;
1189         }
1190         mutex_unlock(&fidvid_mutex);
1191
1192         if (cpu_family == CPU_HW_PSTATE)
1193                 pol->cur = find_khz_freq_from_pstate(data->powernow_table,
1194                                 newstate);
1195         else
1196                 pol->cur = find_khz_freq_from_fid(data->currfid);
1197         ret = 0;
1198
1199 err_out:
1200         set_cpus_allowed_ptr(current, &oldmask);
1201         return ret;
1202 }
1203
1204 /* Driver entry point to verify the policy and range of frequencies */
1205 static int powernowk8_verify(struct cpufreq_policy *pol)
1206 {
1207         struct powernow_k8_data *data = per_cpu(powernow_data, pol->cpu);
1208
1209         if (!data)
1210                 return -EINVAL;
1211
1212         return cpufreq_frequency_table_verify(pol, data->powernow_table);
1213 }
1214
1215 /* per CPU init entry point to the driver */
1216 static int __cpuinit powernowk8_cpu_init(struct cpufreq_policy *pol)
1217 {
1218         struct powernow_k8_data *data;
1219         cpumask_t oldmask;
1220         int rc;
1221         static int print_once;
1222
1223         if (!cpu_online(pol->cpu))
1224                 return -ENODEV;
1225
1226         if (!check_supported_cpu(pol->cpu))
1227                 return -ENODEV;
1228
1229         data = kzalloc(sizeof(struct powernow_k8_data), GFP_KERNEL);
1230         if (!data) {
1231                 printk(KERN_ERR PFX "unable to alloc powernow_k8_data");
1232                 return -ENOMEM;
1233         }
1234
1235         data->cpu = pol->cpu;
1236         data->currpstate = HW_PSTATE_INVALID;
1237
1238         if (powernow_k8_cpu_init_acpi(data)) {
1239                 /*
1240                  * Use the PSB BIOS structure. This is only availabe on
1241                  * an UP version, and is deprecated by AMD.
1242                  */
1243                 if (num_online_cpus() != 1) {
1244                         /*
1245                          * Replace this one with print_once as soon as such a
1246                          * thing gets introduced
1247                          */
1248                         if (!print_once) {
1249                                 WARN_ONCE(1, KERN_ERR FW_BUG PFX "Your BIOS "
1250                                         "does not provide ACPI _PSS objects "
1251                                         "in a way that Linux understands. "
1252                                         "Please report this to the Linux ACPI"
1253                                         " maintainers and complain to your "
1254                                         "BIOS vendor.\n");
1255                                 print_once++;
1256                         }
1257                         goto err_out;
1258                 }
1259                 if (pol->cpu != 0) {
1260                         printk(KERN_ERR FW_BUG PFX "No ACPI _PSS objects for "
1261                                "CPU other than CPU0. Complain to your BIOS "
1262                                "vendor.\n");
1263                         goto err_out;
1264                 }
1265                 rc = find_psb_table(data);
1266                 if (rc)
1267                         goto err_out;
1268
1269                 /* Take a crude guess here.
1270                  * That guess was in microseconds, so multiply with 1000 */
1271                 pol->cpuinfo.transition_latency = (
1272                          ((data->rvo + 8) * data->vstable * VST_UNITS_20US) +
1273                          ((1 << data->irt) * 30)) * 1000;
1274         } else /* ACPI _PSS objects available */
1275                 pol->cpuinfo.transition_latency = get_transition_latency(data);
1276
1277         /* only run on specific CPU from here on */
1278         oldmask = current->cpus_allowed;
1279         set_cpus_allowed_ptr(current, &cpumask_of_cpu(pol->cpu));
1280
1281         if (smp_processor_id() != pol->cpu) {
1282                 printk(KERN_ERR PFX "limiting to cpu %u failed\n", pol->cpu);
1283                 goto err_out_unmask;
1284         }
1285
1286         if (pending_bit_stuck()) {
1287                 printk(KERN_ERR PFX "failing init, change pending bit set\n");
1288                 goto err_out_unmask;
1289         }
1290
1291         if (query_current_values_with_pending_wait(data))
1292                 goto err_out_unmask;
1293
1294         if (cpu_family == CPU_OPTERON)
1295                 fidvid_msr_init();
1296
1297         /* run on any CPU again */
1298         set_cpus_allowed_ptr(current, &oldmask);
1299
1300         if (cpu_family == CPU_HW_PSTATE)
1301                 cpumask_copy(pol->cpus, cpumask_of(pol->cpu));
1302         else
1303                 cpumask_copy(pol->cpus, &per_cpu(cpu_core_map, pol->cpu));
1304         data->available_cores = pol->cpus;
1305
1306         if (cpu_family == CPU_HW_PSTATE)
1307                 pol->cur = find_khz_freq_from_pstate(data->powernow_table,
1308                                 data->currpstate);
1309         else
1310                 pol->cur = find_khz_freq_from_fid(data->currfid);
1311         dprintk("policy current frequency %d kHz\n", pol->cur);
1312
1313         /* min/max the cpu is capable of */
1314         if (cpufreq_frequency_table_cpuinfo(pol, data->powernow_table)) {
1315                 printk(KERN_ERR FW_BUG PFX "invalid powernow_table\n");
1316                 powernow_k8_cpu_exit_acpi(data);
1317                 kfree(data->powernow_table);
1318                 kfree(data);
1319                 return -EINVAL;
1320         }
1321
1322         cpufreq_frequency_table_get_attr(data->powernow_table, pol->cpu);
1323
1324         if (cpu_family == CPU_HW_PSTATE)
1325                 dprintk("cpu_init done, current pstate 0x%x\n",
1326                                 data->currpstate);
1327         else
1328                 dprintk("cpu_init done, current fid 0x%x, vid 0x%x\n",
1329                         data->currfid, data->currvid);
1330
1331         per_cpu(powernow_data, pol->cpu) = data;
1332
1333         return 0;
1334
1335 err_out_unmask:
1336         set_cpus_allowed_ptr(current, &oldmask);
1337         powernow_k8_cpu_exit_acpi(data);
1338
1339 err_out:
1340         kfree(data);
1341         return -ENODEV;
1342 }
1343
1344 static int __devexit powernowk8_cpu_exit(struct cpufreq_policy *pol)
1345 {
1346         struct powernow_k8_data *data = per_cpu(powernow_data, pol->cpu);
1347
1348         if (!data)
1349                 return -EINVAL;
1350
1351         powernow_k8_cpu_exit_acpi(data);
1352
1353         cpufreq_frequency_table_put_attr(pol->cpu);
1354
1355         kfree(data->powernow_table);
1356         kfree(data);
1357
1358         return 0;
1359 }
1360
1361 static unsigned int powernowk8_get(unsigned int cpu)
1362 {
1363         struct powernow_k8_data *data;
1364         cpumask_t oldmask = current->cpus_allowed;
1365         unsigned int khz = 0;
1366         unsigned int first;
1367
1368         first = first_cpu(per_cpu(cpu_core_map, cpu));
1369         data = per_cpu(powernow_data, first);
1370
1371         if (!data)
1372                 return -EINVAL;
1373
1374         set_cpus_allowed_ptr(current, &cpumask_of_cpu(cpu));
1375         if (smp_processor_id() != cpu) {
1376                 printk(KERN_ERR PFX
1377                         "limiting to CPU %d failed in powernowk8_get\n", cpu);
1378                 set_cpus_allowed_ptr(current, &oldmask);
1379                 return 0;
1380         }
1381
1382         if (query_current_values_with_pending_wait(data))
1383                 goto out;
1384
1385         if (cpu_family == CPU_HW_PSTATE)
1386                 khz = find_khz_freq_from_pstate(data->powernow_table,
1387                                                 data->currpstate);
1388         else
1389                 khz = find_khz_freq_from_fid(data->currfid);
1390
1391
1392 out:
1393         set_cpus_allowed_ptr(current, &oldmask);
1394         return khz;
1395 }
1396
1397 static struct freq_attr *powernow_k8_attr[] = {
1398         &cpufreq_freq_attr_scaling_available_freqs,
1399         NULL,
1400 };
1401
1402 static struct cpufreq_driver cpufreq_amd64_driver = {
1403         .verify = powernowk8_verify,
1404         .target = powernowk8_target,
1405         .init = powernowk8_cpu_init,
1406         .exit = __devexit_p(powernowk8_cpu_exit),
1407         .get = powernowk8_get,
1408         .name = "powernow-k8",
1409         .owner = THIS_MODULE,
1410         .attr = powernow_k8_attr,
1411 };
1412
1413 /* driver entry point for init */
1414 static int __cpuinit powernowk8_init(void)
1415 {
1416         unsigned int i, supported_cpus = 0;
1417
1418         for_each_online_cpu(i) {
1419                 if (check_supported_cpu(i))
1420                         supported_cpus++;
1421         }
1422
1423         if (supported_cpus == num_online_cpus()) {
1424                 printk(KERN_INFO PFX "Found %d %s "
1425                         "processors (%d cpu cores) (" VERSION ")\n",
1426                         num_online_nodes(),
1427                         boot_cpu_data.x86_model_id, supported_cpus);
1428                 return cpufreq_register_driver(&cpufreq_amd64_driver);
1429         }
1430
1431         return -ENODEV;
1432 }
1433
1434 /* driver entry point for term */
1435 static void __exit powernowk8_exit(void)
1436 {
1437         dprintk("exit\n");
1438
1439         cpufreq_unregister_driver(&cpufreq_amd64_driver);
1440 }
1441
1442 MODULE_AUTHOR("Paul Devriendt <paul.devriendt@amd.com> and "
1443                 "Mark Langsdorf <mark.langsdorf@amd.com>");
1444 MODULE_DESCRIPTION("AMD Athlon 64 and Opteron processor frequency driver.");
1445 MODULE_LICENSE("GPL");
1446
1447 late_initcall(powernowk8_init);
1448 module_exit(powernowk8_exit);