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