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 <davej@codemonkey.org.uk> 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
  37 #include <asm/msr.h>
  38 #include <asm/io.h>
  39 #include <asm/delay.h>
  40
  41 #ifdef CONFIG_X86_POWERNOW_K8_ACPI
  42 #include <linux/acpi.h>
  43 #include <linux/mutex.h>
  44 #include <acpi/processor.h>
  45 #endif
  46
  47 #define PFX "powernow-k8: "
  48 #define VERSION "version 2.20.00"
  49 #include "powernow-k8.h"
  50
  51 /* serialize freq changes  */
  52 static DEFINE_MUTEX(fidvid_mutex);
  53
  54 static DEFINE_PER_CPU(struct powernow_k8_data *, powernow_data);
  55
  56 static int cpu_family = CPU_OPTERON;
  57
  58 #ifndef CONFIG_SMP
  59 DEFINE_PER_CPU(cpumask_t, cpu_core_map);
  60 #endif
  61
  62 /* Return a frequency in MHz, given an input fid */
  63 static u32 find_freq_from_fid(u32 fid)
  64 {
  65         return 800 + (fid * 100);
  66 }
  67
  68 /* Return a frequency in KHz, given an input fid */
  69 static u32 find_khz_freq_from_fid(u32 fid)
  70 {
  71         return 1000 * find_freq_from_fid(fid);
  72 }
  73
  74 static u32 find_khz_freq_from_pstate(struct cpufreq_frequency_table *data, u32 pstate)
  75 {
  76         return data[pstate].frequency;
  77 }
  78
  79 /* Return the vco fid for an input fid
  80  *
  81  * Each "low" fid has corresponding "high" fid, and you can get to "low" fids
  82  * only from corresponding high fids. This returns "high" fid corresponding to
  83  * "low" one.
  84  */
  85 static u32 convert_fid_to_vco_fid(u32 fid)
  86 {
  87         if (fid < HI_FID_TABLE_BOTTOM)
  88                 return 8 + (2 * fid);
  89         else
  90                 return fid;
  91 }
  92
  93 /*
  94  * Return 1 if the pending bit is set. Unless we just instructed the processor
  95  * to transition to a new state, seeing this bit set is really bad news.
  96  */
  97 static int pending_bit_stuck(void)
  98 {
  99         u32 lo, hi;
 100
 101         if (cpu_family == CPU_HW_PSTATE)
 102                 return 0;
 103
 104         rdmsr(MSR_FIDVID_STATUS, lo, hi);
 105         return lo & MSR_S_LO_CHANGE_PENDING ? 1 : 0;
 106 }
 107
 108 /*
 109  * Update the global current fid / vid values from the status msr.
 110  * Returns 1 on error.
 111  */
 112 static int query_current_values_with_pending_wait(struct powernow_k8_data *data)
 113 {
 114         u32 lo, hi;
 115         u32 i = 0;
 116
 117         if (cpu_family == CPU_HW_PSTATE) {
 118                 rdmsr(MSR_PSTATE_STATUS, lo, hi);
 119                 i = lo & HW_PSTATE_MASK;
 120                 data->currpstate = i;
 121                 return 0;
 122         }
 123         do {
 124                 if (i++ > 10000) {
 125                         dprintk("detected change pending stuck\n");
 126                         return 1;
 127                 }
 128                 rdmsr(MSR_FIDVID_STATUS, lo, hi);
 129         } while (lo & MSR_S_LO_CHANGE_PENDING);
 130
 131         data->currvid = hi & MSR_S_HI_CURRENT_VID;
 132         data->currfid = lo & MSR_S_LO_CURRENT_FID;
 133
 134         return 0;
 135 }
 136
 137 /* the isochronous relief time */
 138 static void count_off_irt(struct powernow_k8_data *data)
 139 {
 140         udelay((1 << data->irt) * 10);
 141         return;
 142 }
 143
 144 /* the voltage stabilization time */
 145 static void count_off_vst(struct powernow_k8_data *data)
 146 {
 147         udelay(data->vstable * VST_UNITS_20US);
 148         return;
 149 }
 150
 151 /* need to init the control msr to a safe value (for each cpu) */
 152 static void fidvid_msr_init(void)
 153 {
 154         u32 lo, hi;
 155         u8 fid, vid;
 156
 157         rdmsr(MSR_FIDVID_STATUS, lo, hi);
 158         vid = hi & MSR_S_HI_CURRENT_VID;
 159         fid = lo & MSR_S_LO_CURRENT_FID;
 160         lo = fid | (vid << MSR_C_LO_VID_SHIFT);
 161         hi = MSR_C_HI_STP_GNT_BENIGN;
 162         dprintk("cpu%d, init lo 0x%x, hi 0x%x\n", smp_processor_id(), lo, hi);
 163         wrmsr(MSR_FIDVID_CTL, lo, hi);
 164 }
 165
 166 /* write the new fid value along with the other control fields to the msr */
 167 static int write_new_fid(struct powernow_k8_data *data, u32 fid)
 168 {
 169         u32 lo;
 170         u32 savevid = data->currvid;
 171         u32 i = 0;
 172
 173         if ((fid & INVALID_FID_MASK) || (data->currvid & INVALID_VID_MASK)) {
 174                 printk(KERN_ERR PFX "internal error - overflow on fid write\n");
 175                 return 1;
 176         }
 177
 178         lo = fid | (data->currvid << MSR_C_LO_VID_SHIFT) | MSR_C_LO_INIT_FID_VID;
 179
 180         dprintk("writing fid 0x%x, lo 0x%x, hi 0x%x\n",
 181                 fid, lo, data->plllock * PLL_LOCK_CONVERSION);
 182
 183         do {
 184                 wrmsr(MSR_FIDVID_CTL, lo, data->plllock * PLL_LOCK_CONVERSION);
 185                 if (i++ > 100) {
 186                         printk(KERN_ERR PFX "Hardware error - pending bit very stuck - no further pstate changes possible\n");
 187                         return 1;
 188                 }
 189         } while (query_current_values_with_pending_wait(data));
 190
 191         count_off_irt(data);
 192
 193         if (savevid != data->currvid) {
 194                 printk(KERN_ERR PFX "vid change on fid trans, old 0x%x, new 0x%x\n",
 195                        savevid, data->currvid);
 196                 return 1;
 197         }
 198
 199         if (fid != data->currfid) {
 200                 printk(KERN_ERR PFX "fid trans failed, fid 0x%x, curr 0x%x\n", fid,
 201                         data->currfid);
 202                 return 1;
 203         }
 204
 205         return 0;
 206 }
 207
 208 /* Write a new vid to the hardware */
 209 static int write_new_vid(struct powernow_k8_data *data, u32 vid)
 210 {
 211         u32 lo;
 212         u32 savefid = data->currfid;
 213         int i = 0;
 214
 215         if ((data->currfid & INVALID_FID_MASK) || (vid & INVALID_VID_MASK)) {
 216                 printk(KERN_ERR PFX "internal error - overflow on vid write\n");
 217                 return 1;
 218         }
 219
 220         lo = data->currfid | (vid << MSR_C_LO_VID_SHIFT) | MSR_C_LO_INIT_FID_VID;
 221
 222         dprintk("writing vid 0x%x, lo 0x%x, hi 0x%x\n",
 223                 vid, lo, STOP_GRANT_5NS);
 224
 225         do {
 226                 wrmsr(MSR_FIDVID_CTL, lo, STOP_GRANT_5NS);
 227                 if (i++ > 100) {
 228                         printk(KERN_ERR PFX "internal error - pending bit very stuck - no further pstate changes possible\n");
 229                         return 1;
 230                 }
 231         } while (query_current_values_with_pending_wait(data));
 232
 233         if (savefid != data->currfid) {
 234                 printk(KERN_ERR PFX "fid changed on vid trans, old 0x%x new 0x%x\n",
 235                        savefid, data->currfid);
 236                 return 1;
 237         }
 238
 239         if (vid != data->currvid) {
 240                 printk(KERN_ERR PFX "vid trans failed, vid 0x%x, curr 0x%x\n", vid,
 241                                 data->currvid);
 242                 return 1;
 243         }
 244
 245         return 0;
 246 }
 247
 248 /*
 249  * Reduce the vid by the max of step or reqvid.
 250  * Decreasing vid codes represent increasing voltages:
 251  * vid of 0 is 1.550V, vid of 0x1e is 0.800V, vid of VID_OFF is off.
 252  */
 253 static int decrease_vid_code_by_step(struct powernow_k8_data *data, u32 reqvid, u32 step)
 254 {
 255         if ((data->currvid - reqvid) > step)
 256                 reqvid = data->currvid - step;
 257
 258         if (write_new_vid(data, reqvid))
 259                 return 1;
 260
 261         count_off_vst(data);
 262
 263         return 0;
 264 }
 265
 266 /* Change hardware pstate by single MSR write */
 267 static int transition_pstate(struct powernow_k8_data *data, u32 pstate)
 268 {
 269         wrmsr(MSR_PSTATE_CTRL, pstate, 0);
 270         data->currpstate = pstate;
 271         return 0;
 272 }
 273
 274 /* Change Opteron/Athlon64 fid and vid, by the 3 phases. */
 275 static int transition_fid_vid(struct powernow_k8_data *data, u32 reqfid, u32 reqvid)
 276 {
 277         if (core_voltage_pre_transition(data, reqvid))
 278                 return 1;
 279
 280         if (core_frequency_transition(data, reqfid))
 281                 return 1;
 282
 283         if (core_voltage_post_transition(data, reqvid))
 284                 return 1;
 285
 286         if (query_current_values_with_pending_wait(data))
 287                 return 1;
 288
 289         if ((reqfid != data->currfid) || (reqvid != data->currvid)) {
 290                 printk(KERN_ERR PFX "failed (cpu%d): req 0x%x 0x%x, curr 0x%x 0x%x\n",
 291                                 smp_processor_id(),
 292                                 reqfid, reqvid, data->currfid, data->currvid);
 293                 return 1;
 294         }
 295
 296         dprintk("transitioned (cpu%d): new fid 0x%x, vid 0x%x\n",
 297                 smp_processor_id(), data->currfid, data->currvid);
 298
 299         return 0;
 300 }
 301
 302 /* Phase 1 - core voltage transition ... setup voltage */
 303 static int core_voltage_pre_transition(struct powernow_k8_data *data, u32 reqvid)
 304 {
 305         u32 rvosteps = data->rvo;
 306         u32 savefid = data->currfid;
 307         u32 maxvid, lo;
 308
 309         dprintk("ph1 (cpu%d): start, currfid 0x%x, currvid 0x%x, reqvid 0x%x, rvo 0x%x\n",
 310                 smp_processor_id(),
 311                 data->currfid, data->currvid, reqvid, data->rvo);
 312
 313         rdmsr(MSR_FIDVID_STATUS, lo, maxvid);
 314         maxvid = 0x1f & (maxvid >> 16);
 315         dprintk("ph1 maxvid=0x%x\n", maxvid);
 316         if (reqvid < maxvid) /* lower numbers are higher voltages */
 317                 reqvid = maxvid;
 318
 319         while (data->currvid > reqvid) {
 320                 dprintk("ph1: curr 0x%x, req vid 0x%x\n",
 321                         data->currvid, reqvid);
 322                 if (decrease_vid_code_by_step(data, reqvid, data->vidmvs))
 323                         return 1;
 324         }
 325
 326         while ((rvosteps > 0) && ((data->rvo + data->currvid) > reqvid)) {
 327                 if (data->currvid == maxvid) {
 328                         rvosteps = 0;
 329                 } else {
 330                         dprintk("ph1: changing vid for rvo, req 0x%x\n",
 331                                 data->currvid - 1);
 332                         if (decrease_vid_code_by_step(data, data->currvid - 1, 1))
 333                                 return 1;
 334                         rvosteps--;
 335                 }
 336         }
 337
 338         if (query_current_values_with_pending_wait(data))
 339                 return 1;
 340
 341         if (savefid != data->currfid) {
 342                 printk(KERN_ERR PFX "ph1 err, currfid changed 0x%x\n", data->currfid);
 343                 return 1;
 344         }
 345
 346         dprintk("ph1 complete, currfid 0x%x, currvid 0x%x\n",
 347                 data->currfid, data->currvid);
 348
 349         return 0;
 350 }
 351
 352 /* Phase 2 - core frequency transition */
 353 static int core_frequency_transition(struct powernow_k8_data *data, u32 reqfid)
 354 {
 355         u32 vcoreqfid, vcocurrfid, vcofiddiff, fid_interval, savevid = data->currvid;
 356
 357         if ((reqfid < HI_FID_TABLE_BOTTOM) && (data->currfid < HI_FID_TABLE_BOTTOM)) {
 358                 printk(KERN_ERR PFX "ph2: illegal lo-lo transition 0x%x 0x%x\n",
 359                         reqfid, data->currfid);
 360                 return 1;
 361         }
 362
 363         if (data->currfid == reqfid) {
 364                 printk(KERN_ERR PFX "ph2 null fid transition 0x%x\n", data->currfid);
 365                 return 0;
 366         }
 367
 368         dprintk("ph2 (cpu%d): starting, currfid 0x%x, currvid 0x%x, reqfid 0x%x\n",
 369                 smp_processor_id(),
 370                 data->currfid, data->currvid, reqfid);
 371
 372         vcoreqfid = convert_fid_to_vco_fid(reqfid);
 373         vcocurrfid = convert_fid_to_vco_fid(data->currfid);
 374         vcofiddiff = vcocurrfid > vcoreqfid ? vcocurrfid - vcoreqfid
 375             : vcoreqfid - vcocurrfid;
 376
 377         while (vcofiddiff > 2) {
 378                 (data->currfid & 1) ? (fid_interval = 1) : (fid_interval = 2);
 379
 380                 if (reqfid > data->currfid) {
 381                         if (data->currfid > LO_FID_TABLE_TOP) {
 382                                 if (write_new_fid(data, data->currfid + fid_interval)) {
 383                                         return 1;
 384                                 }
 385                         } else {
 386                                 if (write_new_fid
 387                                     (data, 2 + convert_fid_to_vco_fid(data->currfid))) {
 388                                         return 1;
 389                                 }
 390                         }
 391                 } else {
 392                         if (write_new_fid(data, data->currfid - fid_interval))
 393                                 return 1;
 394                 }
 395
 396                 vcocurrfid = convert_fid_to_vco_fid(data->currfid);
 397                 vcofiddiff = vcocurrfid > vcoreqfid ? vcocurrfid - vcoreqfid
 398                     : vcoreqfid - vcocurrfid;
 399         }
 400
 401         if (write_new_fid(data, reqfid))
 402                 return 1;
 403
 404         if (query_current_values_with_pending_wait(data))
 405                 return 1;
 406
 407         if (data->currfid != reqfid) {
 408                 printk(KERN_ERR PFX
 409                         "ph2: mismatch, failed fid transition, curr 0x%x, req 0x%x\n",
 410                         data->currfid, reqfid);
 411                 return 1;
 412         }
 413
 414         if (savevid != data->currvid) {
 415                 printk(KERN_ERR PFX "ph2: vid changed, save 0x%x, curr 0x%x\n",
 416                         savevid, data->currvid);
 417                 return 1;
 418         }
 419
 420         dprintk("ph2 complete, currfid 0x%x, currvid 0x%x\n",
 421                 data->currfid, data->currvid);
 422
 423         return 0;
 424 }
 425
 426 /* Phase 3 - core voltage transition flow ... jump to the final vid. */
 427 static int core_voltage_post_transition(struct powernow_k8_data *data, u32 reqvid)
 428 {
 429         u32 savefid = data->currfid;
 430         u32 savereqvid = reqvid;
 431
 432         dprintk("ph3 (cpu%d): starting, currfid 0x%x, currvid 0x%x\n",
 433                 smp_processor_id(),
 434                 data->currfid, data->currvid);
 435
 436         if (reqvid != data->currvid) {
 437                 if (write_new_vid(data, reqvid))
 438                         return 1;
 439
 440                 if (savefid != data->currfid) {
 441                         printk(KERN_ERR PFX
 442                                "ph3: bad fid change, save 0x%x, curr 0x%x\n",
 443                                savefid, data->currfid);
 444                         return 1;
 445                 }
 446
 447                 if (data->currvid != reqvid) {
 448                         printk(KERN_ERR PFX
 449                                "ph3: failed vid transition\n, req 0x%x, curr 0x%x",
 450                                reqvid, data->currvid);
 451                         return 1;
 452                 }
 453         }
 454
 455         if (query_current_values_with_pending_wait(data))
 456                 return 1;
 457
 458         if (savereqvid != data->currvid) {
 459                 dprintk("ph3 failed, currvid 0x%x\n", data->currvid);
 460                 return 1;
 461         }
 462
 463         if (savefid != data->currfid) {
 464                 dprintk("ph3 failed, currfid changed 0x%x\n",
 465                         data->currfid);
 466                 return 1;
 467         }
 468
 469         dprintk("ph3 complete, currfid 0x%x, currvid 0x%x\n",
 470                 data->currfid, data->currvid);
 471
 472         return 0;
 473 }
 474
 475 static int check_supported_cpu(unsigned int cpu)
 476 {
 477         cpumask_t oldmask;
 478         u32 eax, ebx, ecx, edx;
 479         unsigned int rc = 0;
 480
 481         oldmask = current->cpus_allowed;
 482         set_cpus_allowed_ptr(current, &cpumask_of_cpu(cpu));
 483
 484         if (smp_processor_id() != cpu) {
 485                 printk(KERN_ERR PFX "limiting to cpu %u failed\n", cpu);
 486                 goto out;
 487         }
 488
 489         if (current_cpu_data.x86_vendor != X86_VENDOR_AMD)
 490                 goto out;
 491
 492         eax = cpuid_eax(CPUID_PROCESSOR_SIGNATURE);
 493         if (((eax & CPUID_XFAM) != CPUID_XFAM_K8) &&
 494             ((eax & CPUID_XFAM) < CPUID_XFAM_10H))
 495                 goto out;
 496
 497         if ((eax & CPUID_XFAM) == CPUID_XFAM_K8) {
 498                 if (((eax & CPUID_USE_XFAM_XMOD) != CPUID_USE_XFAM_XMOD) ||
 499                     ((eax & CPUID_XMOD) > CPUID_XMOD_REV_MASK)) {
 500                         printk(KERN_INFO PFX "Processor cpuid %x not supported\n", eax);
 501                         goto out;
 502                 }
 503
 504                 eax = cpuid_eax(CPUID_GET_MAX_CAPABILITIES);
 505                 if (eax < CPUID_FREQ_VOLT_CAPABILITIES) {
 506                         printk(KERN_INFO PFX
 507                                "No frequency change capabilities detected\n");
 508                         goto out;
 509                 }
 510
 511                 cpuid(CPUID_FREQ_VOLT_CAPABILITIES, &eax, &ebx, &ecx, &edx);
 512                 if ((edx & P_STATE_TRANSITION_CAPABLE) != P_STATE_TRANSITION_CAPABLE) {
 513                         printk(KERN_INFO PFX "Power state transitions not supported\n");
 514                         goto out;
 515                 }
 516         } else { /* must be a HW Pstate capable processor */
 517                 cpuid(CPUID_FREQ_VOLT_CAPABILITIES, &eax, &ebx, &ecx, &edx);
 518                 if ((edx & USE_HW_PSTATE) == USE_HW_PSTATE)
 519                         cpu_family = CPU_HW_PSTATE;
 520                 else
 521                         goto out;
 522         }
 523
 524         rc = 1;
 525
 526 out:
 527         set_cpus_allowed_ptr(current, &oldmask);
 528         return rc;
 529 }
 530
 531 static int check_pst_table(struct powernow_k8_data *data, struct pst_s *pst, u8 maxvid)
 532 {
 533         unsigned int j;
 534         u8 lastfid = 0xff;
 535
 536         for (j = 0; j < data->numps; j++) {
 537                 if (pst[j].vid > LEAST_VID) {
 538                         printk(KERN_ERR FW_BUG PFX "vid %d invalid : 0x%x\n",
 539                                j, pst[j].vid);
 540                         return -EINVAL;
 541                 }
 542                 if (pst[j].vid < data->rvo) {   /* vid + rvo >= 0 */
 543                         printk(KERN_ERR FW_BUG PFX "0 vid exceeded with pstate"
 544                                " %d\n", j);
 545                         return -ENODEV;
 546                 }
 547                 if (pst[j].vid < maxvid + data->rvo) {  /* vid + rvo >= maxvid */
 548                         printk(KERN_ERR FW_BUG PFX "maxvid exceeded with pstate"
 549                                " %d\n", j);
 550                         return -ENODEV;
 551                 }
 552                 if (pst[j].fid > MAX_FID) {
 553                         printk(KERN_ERR FW_BUG PFX "maxfid exceeded with pstate"
 554                                " %d\n", j);
 555                         return -ENODEV;
 556                 }
 557                 if (j && (pst[j].fid < HI_FID_TABLE_BOTTOM)) {
 558                         /* Only first fid is allowed to be in "low" range */
 559                         printk(KERN_ERR FW_BUG PFX "two low fids - %d : "
 560                                "0x%x\n", j, pst[j].fid);
 561                         return -EINVAL;
 562                 }
 563                 if (pst[j].fid < lastfid)
 564                         lastfid = pst[j].fid;
 565         }
 566         if (lastfid & 1) {
 567                 printk(KERN_ERR FW_BUG PFX "lastfid invalid\n");
 568                 return -EINVAL;
 569         }
 570         if (lastfid > LO_FID_TABLE_TOP)
 571                 printk(KERN_INFO FW_BUG PFX  "first fid not from lo freq table\n");
 572
 573         return 0;
 574 }
 575
 576 static void print_basics(struct powernow_k8_data *data)
 577 {
 578         int j;
 579         for (j = 0; j < data->numps; j++) {
 580                 if (data->powernow_table[j].frequency != CPUFREQ_ENTRY_INVALID) {
 581                         if (cpu_family == CPU_HW_PSTATE) {
 582                                 printk(KERN_INFO PFX "   %d : pstate %d (%d MHz)\n",
 583                                         j,
 584                                         data->powernow_table[j].index,
 585                                         data->powernow_table[j].frequency/1000);
 586                         } else {
 587                                 printk(KERN_INFO PFX "   %d : fid 0x%x (%d MHz), vid 0x%x\n",
 588                                         j,
 589                                         data->powernow_table[j].index & 0xff,
 590                                         data->powernow_table[j].frequency/1000,
 591                                         data->powernow_table[j].index >> 8);
 592                         }
 593                 }
 594         }
 595         if (data->batps)
 596                 printk(KERN_INFO PFX "Only %d pstates on battery\n", data->batps);
 597 }
 598
 599 static int fill_powernow_table(struct powernow_k8_data *data, struct pst_s *pst, u8 maxvid)
 600 {
 601         struct cpufreq_frequency_table *powernow_table;
 602         unsigned int j;
 603
 604         if (data->batps) {    /* use ACPI support to get full speed on mains power */
 605                 printk(KERN_WARNING PFX "Only %d pstates usable (use ACPI driver for full range\n", data->batps);
 606                 data->numps = data->batps;
 607         }
 608
 609         for ( j=1; j<data->numps; j++ ) {
 610                 if (pst[j-1].fid >= pst[j].fid) {
 611                         printk(KERN_ERR PFX "PST out of sequence\n");
 612                         return -EINVAL;
 613                 }
 614         }
 615
 616         if (data->numps < 2) {
 617                 printk(KERN_ERR PFX "no p states to transition\n");
 618                 return -ENODEV;
 619         }
 620
 621         if (check_pst_table(data, pst, maxvid))
 622                 return -EINVAL;
 623
 624         powernow_table = kmalloc((sizeof(struct cpufreq_frequency_table)
 625                 * (data->numps + 1)), GFP_KERNEL);
 626         if (!powernow_table) {
 627                 printk(KERN_ERR PFX "powernow_table memory alloc failure\n");
 628                 return -ENOMEM;
 629         }
 630
 631         for (j = 0; j < data->numps; j++) {
 632                 powernow_table[j].index = pst[j].fid; /* lower 8 bits */
 633                 powernow_table[j].index |= (pst[j].vid << 8); /* upper 8 bits */
 634                 powernow_table[j].frequency = find_khz_freq_from_fid(pst[j].fid);
 635         }
 636         powernow_table[data->numps].frequency = CPUFREQ_TABLE_END;
 637         powernow_table[data->numps].index = 0;
 638
 639         if (query_current_values_with_pending_wait(data)) {
 640                 kfree(powernow_table);
 641                 return -EIO;
 642         }
 643
 644         dprintk("cfid 0x%x, cvid 0x%x\n", data->currfid, data->currvid);
 645         data->powernow_table = powernow_table;
 646         if (first_cpu(per_cpu(cpu_core_map, data->cpu)) == data->cpu)
 647                 print_basics(data);
 648
 649         for (j = 0; j < data->numps; j++)
 650                 if ((pst[j].fid==data->currfid) && (pst[j].vid==data->currvid))
 651                         return 0;
 652
 653         dprintk("currfid/vid do not match PST, ignoring\n");
 654         return 0;
 655 }
 656
 657 /* Find and validate the PSB/PST table in BIOS. */
 658 static int find_psb_table(struct powernow_k8_data *data)
 659 {
 660         struct psb_s *psb;
 661         unsigned int i;
 662         u32 mvs;
 663         u8 maxvid;
 664         u32 cpst = 0;
 665         u32 thiscpuid;
 666
 667         for (i = 0xc0000; i < 0xffff0; i += 0x10) {
 668                 /* Scan BIOS looking for the signature. */
 669                 /* It can not be at ffff0 - it is too big. */
 670
 671                 psb = phys_to_virt(i);
 672                 if (memcmp(psb, PSB_ID_STRING, PSB_ID_STRING_LEN) != 0)
 673                         continue;
 674
 675                 dprintk("found PSB header at 0x%p\n", psb);
 676
 677                 dprintk("table vers: 0x%x\n", psb->tableversion);
 678                 if (psb->tableversion != PSB_VERSION_1_4) {
 679                         printk(KERN_ERR FW_BUG PFX "PSB table is not v1.4\n");
 680                         return -ENODEV;
 681                 }
 682
 683                 dprintk("flags: 0x%x\n", psb->flags1);
 684                 if (psb->flags1) {
 685                         printk(KERN_ERR FW_BUG PFX "unknown flags\n");
 686                         return -ENODEV;
 687                 }
 688
 689                 data->vstable = psb->vstable;
 690                 dprintk("voltage stabilization time: %d(*20us)\n", data->vstable);
 691
 692                 dprintk("flags2: 0x%x\n", psb->flags2);
 693                 data->rvo = psb->flags2 & 3;
 694                 data->irt = ((psb->flags2) >> 2) & 3;
 695                 mvs = ((psb->flags2) >> 4) & 3;
 696                 data->vidmvs = 1 << mvs;
 697                 data->batps = ((psb->flags2) >> 6) & 3;
 698
 699                 dprintk("ramp voltage offset: %d\n", data->rvo);
 700                 dprintk("isochronous relief time: %d\n", data->irt);
 701                 dprintk("maximum voltage step: %d - 0x%x\n", mvs, data->vidmvs);
 702
 703                 dprintk("numpst: 0x%x\n", psb->num_tables);
 704                 cpst = psb->num_tables;
 705                 if ((psb->cpuid == 0x00000fc0) || (psb->cpuid == 0x00000fe0) ){
 706                         thiscpuid = cpuid_eax(CPUID_PROCESSOR_SIGNATURE);
 707                         if ((thiscpuid == 0x00000fc0) || (thiscpuid == 0x00000fe0) ) {
 708                                 cpst = 1;
 709                         }
 710                 }
 711                 if (cpst != 1) {
 712                         printk(KERN_ERR FW_BUG PFX "numpst must be 1\n");
 713                         return -ENODEV;
 714                 }
 715
 716                 data->plllock = psb->plllocktime;
 717                 dprintk("plllocktime: 0x%x (units 1us)\n", psb->plllocktime);
 718                 dprintk("maxfid: 0x%x\n", psb->maxfid);
 719                 dprintk("maxvid: 0x%x\n", psb->maxvid);
 720                 maxvid = psb->maxvid;
 721
 722                 data->numps = psb->numps;
 723                 dprintk("numpstates: 0x%x\n", data->numps);
 724                 return fill_powernow_table(data, (struct pst_s *)(psb+1), maxvid);
 725         }
 726         /*
 727          * If you see this message, complain to BIOS manufacturer. If
 728          * he tells you "we do not support Linux" or some similar
 729          * nonsense, remember that Windows 2000 uses the same legacy
 730          * mechanism that the old Linux PSB driver uses. Tell them it
 731          * is broken with Windows 2000.
 732          *
 733          * The reference to the AMD documentation is chapter 9 in the
 734          * BIOS and Kernel Developer's Guide, which is available on
 735          * www.amd.com
 736          */
 737         printk(KERN_ERR PFX "BIOS error - no PSB or ACPI _PSS objects\n");
 738         return -ENODEV;
 739 }
 740
 741 #ifdef CONFIG_X86_POWERNOW_K8_ACPI
 742 static void powernow_k8_acpi_pst_values(struct powernow_k8_data *data, unsigned int index)
 743 {
 744         if (!data->acpi_data.state_count || (cpu_family == CPU_HW_PSTATE))
 745                 return;
 746
 747         data->irt = (data->acpi_data.states[index].control >> IRT_SHIFT) & IRT_MASK;
 748         data->rvo = (data->acpi_data.states[index].control >> RVO_SHIFT) & RVO_MASK;
 749         data->exttype = (data->acpi_data.states[index].control >> EXT_TYPE_SHIFT) & EXT_TYPE_MASK;
 750         data->plllock = (data->acpi_data.states[index].control >> PLL_L_SHIFT) & PLL_L_MASK;
 751         data->vidmvs = 1 << ((data->acpi_data.states[index].control >> MVS_SHIFT) & MVS_MASK);
 752         data->vstable = (data->acpi_data.states[index].control >> VST_SHIFT) & VST_MASK;
 753 }
 754
 755 static int powernow_k8_cpu_init_acpi(struct powernow_k8_data *data)
 756 {
 757         struct cpufreq_frequency_table *powernow_table;
 758         int ret_val;
 759
 760         if (acpi_processor_register_performance(&data->acpi_data, data->cpu)) {
 761                 dprintk("register performance failed: bad ACPI data\n");
 762                 return -EIO;
 763         }
 764
 765         /* verify the data contained in the ACPI structures */
 766         if (data->acpi_data.state_count <= 1) {
 767                 dprintk("No ACPI P-States\n");
 768                 goto err_out;
 769         }
 770
 771         if ((data->acpi_data.control_register.space_id != ACPI_ADR_SPACE_FIXED_HARDWARE) ||
 772                 (data->acpi_data.status_register.space_id != ACPI_ADR_SPACE_FIXED_HARDWARE)) {
 773                 dprintk("Invalid control/status registers (%x - %x)\n",
 774                         data->acpi_data.control_register.space_id,
 775                         data->acpi_data.status_register.space_id);
 776                 goto err_out;
 777         }
 778
 779         /* fill in data->powernow_table */
 780         powernow_table = kmalloc((sizeof(struct cpufreq_frequency_table)
 781                 * (data->acpi_data.state_count + 1)), GFP_KERNEL);
 782         if (!powernow_table) {
 783                 dprintk("powernow_table memory alloc failure\n");
 784                 goto err_out;
 785         }
 786
 787         if (cpu_family == CPU_HW_PSTATE)
 788                 ret_val = fill_powernow_table_pstate(data, powernow_table);
 789         else
 790                 ret_val = fill_powernow_table_fidvid(data, powernow_table);
 791         if (ret_val)
 792                 goto err_out_mem;
 793
 794         powernow_table[data->acpi_data.state_count].frequency = CPUFREQ_TABLE_END;
 795         powernow_table[data->acpi_data.state_count].index = 0;
 796         data->powernow_table = powernow_table;
 797
 798         /* fill in data */
 799         data->numps = data->acpi_data.state_count;
 800         if (first_cpu(per_cpu(cpu_core_map, data->cpu)) == data->cpu)
 801                 print_basics(data);
 802         powernow_k8_acpi_pst_values(data, 0);
 803
 804         /* notify BIOS that we exist */
 805         acpi_processor_notify_smm(THIS_MODULE);
 806
 807         return 0;
 808
 809 err_out_mem:
 810         kfree(powernow_table);
 811
 812 err_out:
 813         acpi_processor_unregister_performance(&data->acpi_data, data->cpu);
 814
 815         /* data->acpi_data.state_count informs us at ->exit() whether ACPI was used */
 816         data->acpi_data.state_count = 0;
 817
 818         return -ENODEV;
 819 }
 820
 821 static int fill_powernow_table_pstate(struct powernow_k8_data *data, struct cpufreq_frequency_table *powernow_table)
 822 {
 823         int i;
 824         u32 hi = 0, lo = 0;
 825         rdmsr(MSR_PSTATE_CUR_LIMIT, hi, lo);
 826         data->max_hw_pstate = (hi & HW_PSTATE_MAX_MASK) >> HW_PSTATE_MAX_SHIFT;
 827
 828         for (i = 0; i < data->acpi_data.state_count; i++) {
 829                 u32 index;
 830
 831                 index = data->acpi_data.states[i].control & HW_PSTATE_MASK;
 832                 if (index > data->max_hw_pstate) {
 833                         printk(KERN_ERR PFX "invalid pstate %d - bad value %d.\n", i, index);
 834                         printk(KERN_ERR PFX "Please report to BIOS manufacturer\n");
 835                         powernow_table[i].frequency = CPUFREQ_ENTRY_INVALID;
 836                         continue;
 837                 }
 838                 rdmsr(MSR_PSTATE_DEF_BASE + index, lo, hi);
 839                 if (!(hi & HW_PSTATE_VALID_MASK)) {
 840                         dprintk("invalid pstate %d, ignoring\n", index);
 841                         powernow_table[i].frequency = CPUFREQ_ENTRY_INVALID;
 842                         continue;
 843                 }
 844
 845                 powernow_table[i].index = index;
 846
 847                 powernow_table[i].frequency = data->acpi_data.states[i].core_frequency * 1000;
 848         }
 849         return 0;
 850 }
 851
 852 static int fill_powernow_table_fidvid(struct powernow_k8_data *data, struct cpufreq_frequency_table *powernow_table)
 853 {
 854         int i;
 855         int cntlofreq = 0;
 856         for (i = 0; i < data->acpi_data.state_count; i++) {
 857                 u32 fid;
 858                 u32 vid;
 859
 860                 if (data->exttype) {
 861                         fid = data->acpi_data.states[i].status & EXT_FID_MASK;
 862                         vid = (data->acpi_data.states[i].status >> VID_SHIFT) & EXT_VID_MASK;
 863                 } else {
 864                         fid = data->acpi_data.states[i].control & FID_MASK;
 865                         vid = (data->acpi_data.states[i].control >> VID_SHIFT) & VID_MASK;
 866                 }
 867
 868                 dprintk("   %d : fid 0x%x, vid 0x%x\n", i, fid, vid);
 869
 870                 powernow_table[i].index = fid; /* lower 8 bits */
 871                 powernow_table[i].index |= (vid << 8); /* upper 8 bits */
 872                 powernow_table[i].frequency = find_khz_freq_from_fid(fid);
 873
 874                 /* verify frequency is OK */
 875                 if ((powernow_table[i].frequency > (MAX_FREQ * 1000)) ||
 876                         (powernow_table[i].frequency < (MIN_FREQ * 1000))) {
 877                         dprintk("invalid freq %u kHz, ignoring\n", powernow_table[i].frequency);
 878                         powernow_table[i].frequency = CPUFREQ_ENTRY_INVALID;
 879                         continue;
 880                 }
 881
 882                 /* verify voltage is OK - BIOSs are using "off" to indicate invalid */
 883                 if (vid == VID_OFF) {
 884                         dprintk("invalid vid %u, ignoring\n", vid);
 885                         powernow_table[i].frequency = CPUFREQ_ENTRY_INVALID;
 886                         continue;
 887                 }
 888
 889                 /* verify only 1 entry from the lo frequency table */
 890                 if (fid < HI_FID_TABLE_BOTTOM) {
 891                         if (cntlofreq) {
 892                                 /* if both entries are the same, ignore this one ... */
 893                                 if ((powernow_table[i].frequency != powernow_table[cntlofreq].frequency) ||
 894                                     (powernow_table[i].index != powernow_table[cntlofreq].index)) {
 895                                         printk(KERN_ERR PFX "Too many lo freq table entries\n");
 896                                         return 1;
 897                                 }
 898
 899                                 dprintk("double low frequency table entry, ignoring it.\n");
 900                                 powernow_table[i].frequency = CPUFREQ_ENTRY_INVALID;
 901                                 continue;
 902                         } else
 903                                 cntlofreq = i;
 904                 }
 905
 906                 if (powernow_table[i].frequency != (data->acpi_data.states[i].core_frequency * 1000)) {
 907                         printk(KERN_INFO PFX "invalid freq entries %u kHz vs. %u kHz\n",
 908                                 powernow_table[i].frequency,
 909                                 (unsigned int) (data->acpi_data.states[i].core_frequency * 1000));
 910                         powernow_table[i].frequency = CPUFREQ_ENTRY_INVALID;
 911                         continue;
 912                 }
 913         }
 914         return 0;
 915 }
 916
 917 static void powernow_k8_cpu_exit_acpi(struct powernow_k8_data *data)
 918 {
 919         if (data->acpi_data.state_count)
 920                 acpi_processor_unregister_performance(&data->acpi_data, data->cpu);
 921 }
 922
 923 #else
 924 static int powernow_k8_cpu_init_acpi(struct powernow_k8_data *data) { return -ENODEV; }
 925 static void powernow_k8_cpu_exit_acpi(struct powernow_k8_data *data) { return; }
 926 static void powernow_k8_acpi_pst_values(struct powernow_k8_data *data, unsigned int index) { return; }
 927 #endif /* CONFIG_X86_POWERNOW_K8_ACPI */
 928
 929 /* Take a frequency, and issue the fid/vid transition command */
 930 static int transition_frequency_fidvid(struct powernow_k8_data *data, unsigned int index)
 931 {
 932         u32 fid = 0;
 933         u32 vid = 0;
 934         int res, i;
 935         struct cpufreq_freqs freqs;
 936
 937         dprintk("cpu %d transition to index %u\n", smp_processor_id(), index);
 938
 939         /* fid/vid correctness check for k8 */
 940         /* fid are the lower 8 bits of the index we stored into
 941          * the cpufreq frequency table in find_psb_table, vid
 942          * are the upper 8 bits.
 943          */
 944         fid = data->powernow_table[index].index & 0xFF;
 945         vid = (data->powernow_table[index].index & 0xFF00) >> 8;
 946
 947         dprintk("table matched fid 0x%x, giving vid 0x%x\n", fid, vid);
 948
 949         if (query_current_values_with_pending_wait(data))
 950                 return 1;
 951
 952         if ((data->currvid == vid) && (data->currfid == fid)) {
 953                 dprintk("target matches current values (fid 0x%x, vid 0x%x)\n",
 954                         fid, vid);
 955                 return 0;
 956         }
 957
 958         if ((fid < HI_FID_TABLE_BOTTOM) && (data->currfid < HI_FID_TABLE_BOTTOM)) {
 959                 printk(KERN_ERR PFX
 960                        "ignoring illegal change in lo freq table-%x to 0x%x\n",
 961                        data->currfid, fid);
 962                 return 1;
 963         }
 964
 965         dprintk("cpu %d, changing to fid 0x%x, vid 0x%x\n",
 966                 smp_processor_id(), fid, vid);
 967         freqs.old = find_khz_freq_from_fid(data->currfid);
 968         freqs.new = find_khz_freq_from_fid(fid);
 969
 970         for_each_cpu_mask_nr(i, *(data->available_cores)) {
 971                 freqs.cpu = i;
 972                 cpufreq_notify_transition(&freqs, CPUFREQ_PRECHANGE);
 973         }
 974
 975         res = transition_fid_vid(data, fid, vid);
 976         freqs.new = find_khz_freq_from_fid(data->currfid);
 977
 978         for_each_cpu_mask_nr(i, *(data->available_cores)) {
 979                 freqs.cpu = i;
 980                 cpufreq_notify_transition(&freqs, CPUFREQ_POSTCHANGE);
 981         }
 982         return res;
 983 }
 984
 985 /* Take a frequency, and issue the hardware pstate transition command */
 986 static int transition_frequency_pstate(struct powernow_k8_data *data, unsigned int index)
 987 {
 988         u32 pstate = 0;
 989         int res, i;
 990         struct cpufreq_freqs freqs;
 991
 992         dprintk("cpu %d transition to index %u\n", smp_processor_id(), index);
 993
 994         /* get MSR index for hardware pstate transition */
 995         pstate = index & HW_PSTATE_MASK;
 996         if (pstate > data->max_hw_pstate)
 997                 return 0;
 998         freqs.old = find_khz_freq_from_pstate(data->powernow_table, data->currpstate);
 999         freqs.new = find_khz_freq_from_pstate(data->powernow_table, pstate);
1000
1001         for_each_cpu_mask_nr(i, *(data->available_cores)) {
1002                 freqs.cpu = i;
1003                 cpufreq_notify_transition(&freqs, CPUFREQ_PRECHANGE);
1004         }
1005
1006         res = transition_pstate(data, pstate);
1007         freqs.new = find_khz_freq_from_pstate(data->powernow_table, pstate);
1008
1009         for_each_cpu_mask_nr(i, *(data->available_cores)) {
1010                 freqs.cpu = i;
1011                 cpufreq_notify_transition(&freqs, CPUFREQ_POSTCHANGE);
1012         }
1013         return res;
1014 }
1015
1016 /* Driver entry point to switch to the target frequency */
1017 static int powernowk8_target(struct cpufreq_policy *pol, unsigned targfreq, unsigned relation)
1018 {
1019         cpumask_t oldmask;
1020         struct powernow_k8_data *data = per_cpu(powernow_data, pol->cpu);
1021         u32 checkfid;
1022         u32 checkvid;
1023         unsigned int newstate;
1024         int ret = -EIO;
1025
1026         if (!data)
1027                 return -EINVAL;
1028
1029         checkfid = data->currfid;
1030         checkvid = data->currvid;
1031
1032         /* only run on specific CPU from here on */
1033         oldmask = current->cpus_allowed;
1034         set_cpus_allowed_ptr(current, &cpumask_of_cpu(pol->cpu));
1035
1036         if (smp_processor_id() != pol->cpu) {
1037                 printk(KERN_ERR PFX "limiting to cpu %u failed\n", pol->cpu);
1038                 goto err_out;
1039         }
1040
1041         if (pending_bit_stuck()) {
1042                 printk(KERN_ERR PFX "failing targ, change pending bit set\n");
1043                 goto err_out;
1044         }
1045
1046         dprintk("targ: cpu %d, %d kHz, min %d, max %d, relation %d\n",
1047                 pol->cpu, targfreq, pol->min, pol->max, relation);
1048
1049         if (query_current_values_with_pending_wait(data))
1050                 goto err_out;
1051
1052         if (cpu_family != CPU_HW_PSTATE) {
1053                 dprintk("targ: curr fid 0x%x, vid 0x%x\n",
1054                 data->currfid, data->currvid);
1055
1056                 if ((checkvid != data->currvid) || (checkfid != data->currfid)) {
1057                         printk(KERN_INFO PFX
1058                                 "error - out of sync, fix 0x%x 0x%x, vid 0x%x 0x%x\n",
1059                                 checkfid, data->currfid, checkvid, data->currvid);
1060                 }
1061         }
1062
1063         if (cpufreq_frequency_table_target(pol, data->powernow_table, targfreq, relation, &newstate))
1064                 goto err_out;
1065
1066         mutex_lock(&fidvid_mutex);
1067
1068         powernow_k8_acpi_pst_values(data, newstate);
1069
1070         if (cpu_family == CPU_HW_PSTATE)
1071                 ret = transition_frequency_pstate(data, newstate);
1072         else
1073                 ret = transition_frequency_fidvid(data, newstate);
1074         if (ret) {
1075                 printk(KERN_ERR PFX "transition frequency failed\n");
1076                 ret = 1;
1077                 mutex_unlock(&fidvid_mutex);
1078                 goto err_out;
1079         }
1080         mutex_unlock(&fidvid_mutex);
1081
1082         if (cpu_family == CPU_HW_PSTATE)
1083                 pol->cur = find_khz_freq_from_pstate(data->powernow_table, newstate);
1084         else
1085                 pol->cur = find_khz_freq_from_fid(data->currfid);
1086         ret = 0;
1087
1088 err_out:
1089         set_cpus_allowed_ptr(current, &oldmask);
1090         return ret;
1091 }
1092
1093 /* Driver entry point to verify the policy and range of frequencies */
1094 static int powernowk8_verify(struct cpufreq_policy *pol)
1095 {
1096         struct powernow_k8_data *data = per_cpu(powernow_data, pol->cpu);
1097
1098         if (!data)
1099                 return -EINVAL;
1100
1101         return cpufreq_frequency_table_verify(pol, data->powernow_table);
1102 }
1103
1104 /* per CPU init entry point to the driver */
1105 static int __cpuinit powernowk8_cpu_init(struct cpufreq_policy *pol)
1106 {
1107         struct powernow_k8_data *data;
1108         cpumask_t oldmask;
1109         int rc;
1110
1111         if (!cpu_online(pol->cpu))
1112                 return -ENODEV;
1113
1114         if (!check_supported_cpu(pol->cpu))
1115                 return -ENODEV;
1116
1117         data = kzalloc(sizeof(struct powernow_k8_data), GFP_KERNEL);
1118         if (!data) {
1119                 printk(KERN_ERR PFX "unable to alloc powernow_k8_data");
1120                 return -ENOMEM;
1121         }
1122
1123         data->cpu = pol->cpu;
1124
1125         if (powernow_k8_cpu_init_acpi(data)) {
1126                 /*
1127                  * Use the PSB BIOS structure. This is only availabe on
1128                  * an UP version, and is deprecated by AMD.
1129                  */
1130                 if (num_online_cpus() != 1) {
1131 #ifndef CONFIG_ACPI_PROCESSOR
1132                         printk(KERN_ERR PFX "ACPI Processor support is required "
1133                                "for SMP systems but is absent. Please load the "
1134                                "ACPI Processor module before starting this "
1135                                "driver.\n");
1136 #else
1137                         printk(KERN_ERR FW_BUG PFX "Your BIOS does not provide"
1138                                " ACPI _PSS objects in a way that Linux "
1139                                "understands. Please report this to the Linux "
1140                                "ACPI maintainers and complain to your BIOS "
1141                                "vendor.\n");
1142 #endif
1143                         kfree(data);
1144                         return -ENODEV;
1145                 }
1146                 if (pol->cpu != 0) {
1147                         printk(KERN_ERR FW_BUG PFX "No ACPI _PSS objects for "
1148                                "CPU other than CPU0. Complain to your BIOS "
1149                                "vendor.\n");
1150                         kfree(data);
1151                         return -ENODEV;
1152                 }
1153                 rc = find_psb_table(data);
1154                 if (rc) {
1155                         kfree(data);
1156                         return -ENODEV;
1157                 }
1158         }
1159
1160         /* only run on specific CPU from here on */
1161         oldmask = current->cpus_allowed;
1162         set_cpus_allowed_ptr(current, &cpumask_of_cpu(pol->cpu));
1163
1164         if (smp_processor_id() != pol->cpu) {
1165                 printk(KERN_ERR PFX "limiting to cpu %u failed\n", pol->cpu);
1166                 goto err_out;
1167         }
1168
1169         if (pending_bit_stuck()) {
1170                 printk(KERN_ERR PFX "failing init, change pending bit set\n");
1171                 goto err_out;
1172         }
1173
1174         if (query_current_values_with_pending_wait(data))
1175                 goto err_out;
1176
1177         if (cpu_family == CPU_OPTERON)
1178                 fidvid_msr_init();
1179
1180         /* run on any CPU again */
1181         set_cpus_allowed_ptr(current, &oldmask);
1182
1183         if (cpu_family == CPU_HW_PSTATE)
1184                 pol->cpus = cpumask_of_cpu(pol->cpu);
1185         else
1186                 pol->cpus = per_cpu(cpu_core_map, pol->cpu);
1187         data->available_cores = &(pol->cpus);
1188
1189         /* Take a crude guess here.
1190          * That guess was in microseconds, so multiply with 1000 */
1191         pol->cpuinfo.transition_latency = (((data->rvo + 8) * data->vstable * VST_UNITS_20US)
1192             + (3 * (1 << data->irt) * 10)) * 1000;
1193
1194         if (cpu_family == CPU_HW_PSTATE)
1195                 pol->cur = find_khz_freq_from_pstate(data->powernow_table, data->currpstate);
1196         else
1197                 pol->cur = find_khz_freq_from_fid(data->currfid);
1198         dprintk("policy current frequency %d kHz\n", pol->cur);
1199
1200         /* min/max the cpu is capable of */
1201         if (cpufreq_frequency_table_cpuinfo(pol, data->powernow_table)) {
1202                 printk(KERN_ERR FW_BUG PFX "invalid powernow_table\n");
1203                 powernow_k8_cpu_exit_acpi(data);
1204                 kfree(data->powernow_table);
1205                 kfree(data);
1206                 return -EINVAL;
1207         }
1208
1209         cpufreq_frequency_table_get_attr(data->powernow_table, pol->cpu);
1210
1211         if (cpu_family == CPU_HW_PSTATE)
1212                 dprintk("cpu_init done, current pstate 0x%x\n", data->currpstate);
1213         else
1214                 dprintk("cpu_init done, current fid 0x%x, vid 0x%x\n",
1215                         data->currfid, data->currvid);
1216
1217         per_cpu(powernow_data, pol->cpu) = data;
1218
1219         return 0;
1220
1221 err_out:
1222         set_cpus_allowed_ptr(current, &oldmask);
1223         powernow_k8_cpu_exit_acpi(data);
1224
1225         kfree(data);
1226         return -ENODEV;
1227 }
1228
1229 static int __devexit powernowk8_cpu_exit (struct cpufreq_policy *pol)
1230 {
1231         struct powernow_k8_data *data = per_cpu(powernow_data, pol->cpu);
1232
1233         if (!data)
1234                 return -EINVAL;
1235
1236         powernow_k8_cpu_exit_acpi(data);
1237
1238         cpufreq_frequency_table_put_attr(pol->cpu);
1239
1240         kfree(data->powernow_table);
1241         kfree(data);
1242
1243         return 0;
1244 }
1245
1246 static unsigned int powernowk8_get (unsigned int cpu)
1247 {
1248         struct powernow_k8_data *data;
1249         cpumask_t oldmask = current->cpus_allowed;
1250         unsigned int khz = 0;
1251         unsigned int first;
1252
1253         first = first_cpu(per_cpu(cpu_core_map, cpu));
1254         data = per_cpu(powernow_data, first);
1255
1256         if (!data)
1257                 return -EINVAL;
1258
1259         set_cpus_allowed_ptr(current, &cpumask_of_cpu(cpu));
1260         if (smp_processor_id() != cpu) {
1261                 printk(KERN_ERR PFX
1262                         "limiting to CPU %d failed in powernowk8_get\n", cpu);
1263                 set_cpus_allowed_ptr(current, &oldmask);
1264                 return 0;
1265         }
1266
1267         if (query_current_values_with_pending_wait(data))
1268                 goto out;
1269
1270         if (cpu_family == CPU_HW_PSTATE)
1271                 khz = find_khz_freq_from_pstate(data->powernow_table,
1272                                                 data->currpstate);
1273         else
1274                 khz = find_khz_freq_from_fid(data->currfid);
1275
1276
1277 out:
1278         set_cpus_allowed_ptr(current, &oldmask);
1279         return khz;
1280 }
1281
1282 static struct freq_attr* powernow_k8_attr[] = {
1283         &cpufreq_freq_attr_scaling_available_freqs,
1284         NULL,
1285 };
1286
1287 static struct cpufreq_driver cpufreq_amd64_driver = {
1288         .verify = powernowk8_verify,
1289         .target = powernowk8_target,
1290         .init = powernowk8_cpu_init,
1291         .exit = __devexit_p(powernowk8_cpu_exit),
1292         .get = powernowk8_get,
1293         .name = "powernow-k8",
1294         .owner = THIS_MODULE,
1295         .attr = powernow_k8_attr,
1296 };
1297
1298 /* driver entry point for init */
1299 static int __cpuinit powernowk8_init(void)
1300 {
1301         unsigned int i, supported_cpus = 0;
1302
1303         for_each_online_cpu(i) {
1304                 if (check_supported_cpu(i))
1305                         supported_cpus++;
1306         }
1307
1308         if (supported_cpus == num_online_cpus()) {
1309                 printk(KERN_INFO PFX "Found %d %s "
1310                         "processors (%d cpu cores) (" VERSION ")\n",
1311                         num_online_nodes(),
1312                         boot_cpu_data.x86_model_id, supported_cpus);
1313                 return cpufreq_register_driver(&cpufreq_amd64_driver);
1314         }
1315
1316         return -ENODEV;
1317 }
1318
1319 /* driver entry point for term */
1320 static void __exit powernowk8_exit(void)
1321 {
1322         dprintk("exit\n");
1323
1324         cpufreq_unregister_driver(&cpufreq_amd64_driver);
1325 }
1326
1327 MODULE_AUTHOR("Paul Devriendt <paul.devriendt@amd.com> and Mark Langsdorf <mark.langsdorf@amd.com>");
1328 MODULE_DESCRIPTION("AMD Athlon 64 and Opteron processor frequency driver.");
1329 MODULE_LICENSE("GPL");
1330
1331 late_initcall(powernowk8_init);
1332 module_exit(powernowk8_exit);