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

   1 /*
   2  *   (c) 2003-2006 Advanced Micro Devices, Inc.
   3  *  Your use of this code is subject to the terms and conditions of the
   4  *  GNU general public license version 2. See "COPYING" or
   5  *  http://www.gnu.org/licenses/gpl.html
   6  *
   7  *  Support : mark.langsdorf@amd.com
   8  *
   9  *  Based on the powernow-k7.c module written by Dave Jones.
  10  *  (C) 2003 Dave Jones on behalf of SuSE Labs
  11  *  (C) 2004 Dominik Brodowski <linux@brodo.de>
  12  *  (C) 2004 Pavel Machek <pavel@suse.cz>
  13  *  Licensed under the terms of the GNU GPL License version 2.
  14  *  Based upon datasheets & sample CPUs kindly provided by AMD.
  15  *
  16  *  Valuable input gratefully received from Dave Jones, Pavel Machek,
  17  *  Dominik Brodowski, Jacob Shin, and others.
  18  *  Originally developed by Paul Devriendt.
  19  *  Processor information obtained from Chapter 9 (Power and Thermal Management)
  20  *  of the "BIOS and Kernel Developer's Guide for the AMD Athlon 64 and AMD
  21  *  Opteron Processors" available for download from www.amd.com
  22  *
  23  *  Tables for specific CPUs can be inferred from
  24  *     http://www.amd.com/us-en/assets/content_type/white_papers_and_tech_docs/30430.pdf
  25  */
  26
  27 #include <linux/kernel.h>
  28 #include <linux/smp.h>
  29 #include <linux/module.h>
  30 #include <linux/init.h>
  31 #include <linux/cpufreq.h>
  32 #include <linux/slab.h>
  33 #include <linux/string.h>
  34 #include <linux/cpumask.h>
  35 #include <linux/sched.h>        /* for current / set_cpus_allowed() */
  36
  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                 if (data->currpstate == HW_PSTATE_INVALID) {
 119                         /* read (initial) hw pstate if not yet set */
 120                         rdmsr(MSR_PSTATE_STATUS, lo, hi);
 121                         i = lo & HW_PSTATE_MASK;
 122
 123                         /*
 124                          * a workaround for family 11h erratum 311 might cause
 125                          * an "out-of-range Pstate if the core is in Pstate-0
 126                          */
 127                         if (i >= data->numps)
 128                                 data->currpstate = HW_PSTATE_0;
 129                         else
 130                                 data->currpstate = i;
 131                 }
 132                 return 0;
 133         }
 134         do {
 135                 if (i++ > 10000) {
 136                         dprintk("detected change pending stuck\n");
 137                         return 1;
 138                 }
 139                 rdmsr(MSR_FIDVID_STATUS, lo, hi);
 140         } while (lo & MSR_S_LO_CHANGE_PENDING);
 141
 142         data->currvid = hi & MSR_S_HI_CURRENT_VID;
 143         data->currfid = lo & MSR_S_LO_CURRENT_FID;
 144
 145         return 0;
 146 }
 147
 148 /* the isochronous relief time */
 149 static void count_off_irt(struct powernow_k8_data *data)
 150 {
 151         udelay((1 << data->irt) * 10);
 152         return;
 153 }
 154
 155 /* the voltage stabilization time */
 156 static void count_off_vst(struct powernow_k8_data *data)
 157 {
 158         udelay(data->vstable * VST_UNITS_20US);
 159         return;
 160 }
 161
 162 /* need to init the control msr to a safe value (for each cpu) */
 163 static void fidvid_msr_init(void)
 164 {
 165         u32 lo, hi;
 166         u8 fid, vid;
 167
 168         rdmsr(MSR_FIDVID_STATUS, lo, hi);
 169         vid = hi & MSR_S_HI_CURRENT_VID;
 170         fid = lo & MSR_S_LO_CURRENT_FID;
 171         lo = fid | (vid << MSR_C_LO_VID_SHIFT);
 172         hi = MSR_C_HI_STP_GNT_BENIGN;
 173         dprintk("cpu%d, init lo 0x%x, hi 0x%x\n", smp_processor_id(), lo, hi);
 174         wrmsr(MSR_FIDVID_CTL, lo, hi);
 175 }
 176
 177 /* write the new fid value along with the other control fields to the msr */
 178 static int write_new_fid(struct powernow_k8_data *data, u32 fid)
 179 {
 180         u32 lo;
 181         u32 savevid = data->currvid;
 182         u32 i = 0;
 183
 184         if ((fid & INVALID_FID_MASK) || (data->currvid & INVALID_VID_MASK)) {
 185                 printk(KERN_ERR PFX "internal error - overflow on fid write\n");
 186                 return 1;
 187         }
 188
 189         lo = fid | (data->currvid << MSR_C_LO_VID_SHIFT) | MSR_C_LO_INIT_FID_VID;
 190
 191         dprintk("writing fid 0x%x, lo 0x%x, hi 0x%x\n",
 192                 fid, lo, data->plllock * PLL_LOCK_CONVERSION);
 193
 194         do {
 195                 wrmsr(MSR_FIDVID_CTL, lo, data->plllock * PLL_LOCK_CONVERSION);
 196                 if (i++ > 100) {
 197                         printk(KERN_ERR PFX "Hardware error - pending bit very stuck - no further pstate changes possible\n");
 198                         return 1;
 199                 }
 200         } while (query_current_values_with_pending_wait(data));
 201
 202         count_off_irt(data);
 203
 204         if (savevid != data->currvid) {
 205                 printk(KERN_ERR PFX "vid change on fid trans, old 0x%x, new 0x%x\n",
 206                        savevid, data->currvid);
 207                 return 1;
 208         }
 209
 210         if (fid != data->currfid) {
 211                 printk(KERN_ERR PFX "fid trans failed, fid 0x%x, curr 0x%x\n", fid,
 212                         data->currfid);
 213                 return 1;
 214         }
 215
 216         return 0;
 217 }
 218
 219 /* Write a new vid to the hardware */
 220 static int write_new_vid(struct powernow_k8_data *data, u32 vid)
 221 {
 222         u32 lo;
 223         u32 savefid = data->currfid;
 224         int i = 0;
 225
 226         if ((data->currfid & INVALID_FID_MASK) || (vid & INVALID_VID_MASK)) {
 227                 printk(KERN_ERR PFX "internal error - overflow on vid write\n");
 228                 return 1;
 229         }
 230
 231         lo = data->currfid | (vid << MSR_C_LO_VID_SHIFT) | MSR_C_LO_INIT_FID_VID;
 232
 233         dprintk("writing vid 0x%x, lo 0x%x, hi 0x%x\n",
 234                 vid, lo, STOP_GRANT_5NS);
 235
 236         do {
 237                 wrmsr(MSR_FIDVID_CTL, lo, STOP_GRANT_5NS);
 238                 if (i++ > 100) {
 239                         printk(KERN_ERR PFX "internal error - pending bit very stuck - no further pstate changes possible\n");
 240                         return 1;
 241                 }
 242         } while (query_current_values_with_pending_wait(data));
 243
 244         if (savefid != data->currfid) {
 245                 printk(KERN_ERR PFX "fid changed on vid trans, old 0x%x new 0x%x\n",
 246                        savefid, data->currfid);
 247                 return 1;
 248         }
 249
 250         if (vid != data->currvid) {
 251                 printk(KERN_ERR PFX "vid trans failed, vid 0x%x, curr 0x%x\n", vid,
 252                                 data->currvid);
 253                 return 1;
 254         }
 255
 256         return 0;
 257 }
 258
 259 /*
 260  * Reduce the vid by the max of step or reqvid.
 261  * Decreasing vid codes represent increasing voltages:
 262  * vid of 0 is 1.550V, vid of 0x1e is 0.800V, vid of VID_OFF is off.
 263  */
 264 static int decrease_vid_code_by_step(struct powernow_k8_data *data, u32 reqvid, u32 step)
 265 {
 266         if ((data->currvid - reqvid) > step)
 267                 reqvid = data->currvid - step;
 268
 269         if (write_new_vid(data, reqvid))
 270                 return 1;
 271
 272         count_off_vst(data);
 273
 274         return 0;
 275 }
 276
 277 /* Change hardware pstate by single MSR write */
 278 static int transition_pstate(struct powernow_k8_data *data, u32 pstate)
 279 {
 280         wrmsr(MSR_PSTATE_CTRL, pstate, 0);
 281         data->currpstate = pstate;
 282         return 0;
 283 }
 284
 285 /* Change Opteron/Athlon64 fid and vid, by the 3 phases. */
 286 static int transition_fid_vid(struct powernow_k8_data *data, u32 reqfid, u32 reqvid)
 287 {
 288         if (core_voltage_pre_transition(data, reqvid))
 289                 return 1;
 290
 291         if (core_frequency_transition(data, reqfid))
 292                 return 1;
 293
 294         if (core_voltage_post_transition(data, reqvid))
 295                 return 1;
 296
 297         if (query_current_values_with_pending_wait(data))
 298                 return 1;
 299
 300         if ((reqfid != data->currfid) || (reqvid != data->currvid)) {
 301                 printk(KERN_ERR PFX "failed (cpu%d): req 0x%x 0x%x, curr 0x%x 0x%x\n",
 302                                 smp_processor_id(),
 303                                 reqfid, reqvid, data->currfid, data->currvid);
 304                 return 1;
 305         }
 306
 307         dprintk("transitioned (cpu%d): new fid 0x%x, vid 0x%x\n",
 308                 smp_processor_id(), data->currfid, data->currvid);
 309
 310         return 0;
 311 }
 312
 313 /* Phase 1 - core voltage transition ... setup voltage */
 314 static int core_voltage_pre_transition(struct powernow_k8_data *data, u32 reqvid)
 315 {
 316         u32 rvosteps = data->rvo;
 317         u32 savefid = data->currfid;
 318         u32 maxvid, lo;
 319
 320         dprintk("ph1 (cpu%d): start, currfid 0x%x, currvid 0x%x, reqvid 0x%x, rvo 0x%x\n",
 321                 smp_processor_id(),
 322                 data->currfid, data->currvid, reqvid, data->rvo);
 323
 324         rdmsr(MSR_FIDVID_STATUS, lo, maxvid);
 325         maxvid = 0x1f & (maxvid >> 16);
 326         dprintk("ph1 maxvid=0x%x\n", maxvid);
 327         if (reqvid < maxvid) /* lower numbers are higher voltages */
 328                 reqvid = maxvid;
 329
 330         while (data->currvid > reqvid) {
 331                 dprintk("ph1: curr 0x%x, req vid 0x%x\n",
 332                         data->currvid, reqvid);
 333                 if (decrease_vid_code_by_step(data, reqvid, data->vidmvs))
 334                         return 1;
 335         }
 336
 337         while ((rvosteps > 0) && ((data->rvo + data->currvid) > reqvid)) {
 338                 if (data->currvid == maxvid) {
 339                         rvosteps = 0;
 340                 } else {
 341                         dprintk("ph1: changing vid for rvo, req 0x%x\n",
 342                                 data->currvid - 1);
 343                         if (decrease_vid_code_by_step(data, data->currvid - 1, 1))
 344                                 return 1;
 345                         rvosteps--;
 346                 }
 347         }
 348
 349         if (query_current_values_with_pending_wait(data))
 350                 return 1;
 351
 352         if (savefid != data->currfid) {
 353                 printk(KERN_ERR PFX "ph1 err, currfid changed 0x%x\n", data->currfid);
 354                 return 1;
 355         }
 356
 357         dprintk("ph1 complete, currfid 0x%x, currvid 0x%x\n",
 358                 data->currfid, data->currvid);
 359
 360         return 0;
 361 }
 362
 363 /* Phase 2 - core frequency transition */
 364 static int core_frequency_transition(struct powernow_k8_data *data, u32 reqfid)
 365 {
 366         u32 vcoreqfid, vcocurrfid, vcofiddiff, fid_interval, savevid = data->currvid;
 367
 368         if ((reqfid < HI_FID_TABLE_BOTTOM) && (data->currfid < HI_FID_TABLE_BOTTOM)) {
 369                 printk(KERN_ERR PFX "ph2: illegal lo-lo transition 0x%x 0x%x\n",
 370                         reqfid, data->currfid);
 371                 return 1;
 372         }
 373
 374         if (data->currfid == reqfid) {
 375                 printk(KERN_ERR PFX "ph2 null fid transition 0x%x\n", data->currfid);
 376                 return 0;
 377         }
 378
 379         dprintk("ph2 (cpu%d): starting, currfid 0x%x, currvid 0x%x, reqfid 0x%x\n",
 380                 smp_processor_id(),
 381                 data->currfid, data->currvid, reqfid);
 382
 383         vcoreqfid = convert_fid_to_vco_fid(reqfid);
 384         vcocurrfid = convert_fid_to_vco_fid(data->currfid);
 385         vcofiddiff = vcocurrfid > vcoreqfid ? vcocurrfid - vcoreqfid
 386             : vcoreqfid - vcocurrfid;
 387
 388         while (vcofiddiff > 2) {
 389                 (data->currfid & 1) ? (fid_interval = 1) : (fid_interval = 2);
 390
 391                 if (reqfid > data->currfid) {
 392                         if (data->currfid > LO_FID_TABLE_TOP) {
 393                                 if (write_new_fid(data, data->currfid + fid_interval)) {
 394                                         return 1;
 395                                 }
 396                         } else {
 397                                 if (write_new_fid
 398                                     (data, 2 + convert_fid_to_vco_fid(data->currfid))) {
 399                                         return 1;
 400                                 }
 401                         }
 402                 } else {
 403                         if (write_new_fid(data, data->currfid - fid_interval))
 404                                 return 1;
 405                 }
 406
 407                 vcocurrfid = convert_fid_to_vco_fid(data->currfid);
 408                 vcofiddiff = vcocurrfid > vcoreqfid ? vcocurrfid - vcoreqfid
 409                     : vcoreqfid - vcocurrfid;
 410         }
 411
 412         if (write_new_fid(data, reqfid))
 413                 return 1;
 414
 415         if (query_current_values_with_pending_wait(data))
 416                 return 1;
 417
 418         if (data->currfid != reqfid) {
 419                 printk(KERN_ERR PFX
 420                         "ph2: mismatch, failed fid transition, curr 0x%x, req 0x%x\n",
 421                         data->currfid, reqfid);
 422                 return 1;
 423         }
 424
 425         if (savevid != data->currvid) {
 426                 printk(KERN_ERR PFX "ph2: vid changed, save 0x%x, curr 0x%x\n",
 427                         savevid, data->currvid);
 428                 return 1;
 429         }
 430
 431         dprintk("ph2 complete, currfid 0x%x, currvid 0x%x\n",
 432                 data->currfid, data->currvid);
 433
 434         return 0;
 435 }
 436
 437 /* Phase 3 - core voltage transition flow ... jump to the final vid. */
 438 static int core_voltage_post_transition(struct powernow_k8_data *data, u32 reqvid)
 439 {
 440         u32 savefid = data->currfid;
 441         u32 savereqvid = reqvid;
 442
 443         dprintk("ph3 (cpu%d): starting, currfid 0x%x, currvid 0x%x\n",
 444                 smp_processor_id(),
 445                 data->currfid, data->currvid);
 446
 447         if (reqvid != data->currvid) {
 448                 if (write_new_vid(data, reqvid))
 449                         return 1;
 450
 451                 if (savefid != data->currfid) {
 452                         printk(KERN_ERR PFX
 453                                "ph3: bad fid change, save 0x%x, curr 0x%x\n",
 454                                savefid, data->currfid);
 455                         return 1;
 456                 }
 457
 458                 if (data->currvid != reqvid) {
 459                         printk(KERN_ERR PFX
 460                                "ph3: failed vid transition\n, req 0x%x, curr 0x%x",
 461                                reqvid, data->currvid);
 462                         return 1;
 463                 }
 464         }
 465
 466         if (query_current_values_with_pending_wait(data))
 467                 return 1;
 468
 469         if (savereqvid != data->currvid) {
 470                 dprintk("ph3 failed, currvid 0x%x\n", data->currvid);
 471                 return 1;
 472         }
 473
 474         if (savefid != data->currfid) {
 475                 dprintk("ph3 failed, currfid changed 0x%x\n",
 476                         data->currfid);
 477                 return 1;
 478         }
 479
 480         dprintk("ph3 complete, currfid 0x%x, currvid 0x%x\n",
 481                 data->currfid, data->currvid);
 482
 483         return 0;
 484 }
 485
 486 static int check_supported_cpu(unsigned int cpu)
 487 {
 488         cpumask_t oldmask;
 489         u32 eax, ebx, ecx, edx;
 490         unsigned int rc = 0;
 491
 492         oldmask = current->cpus_allowed;
 493         set_cpus_allowed_ptr(current, &cpumask_of_cpu(cpu));
 494
 495         if (smp_processor_id() != cpu) {
 496                 printk(KERN_ERR PFX "limiting to cpu %u failed\n", cpu);
 497                 goto out;
 498         }
 499
 500         if (current_cpu_data.x86_vendor != X86_VENDOR_AMD)
 501                 goto out;
 502
 503         eax = cpuid_eax(CPUID_PROCESSOR_SIGNATURE);
 504         if (((eax & CPUID_XFAM) != CPUID_XFAM_K8) &&
 505             ((eax & CPUID_XFAM) < CPUID_XFAM_10H))
 506                 goto out;
 507
 508         if ((eax & CPUID_XFAM) == CPUID_XFAM_K8) {
 509                 if (((eax & CPUID_USE_XFAM_XMOD) != CPUID_USE_XFAM_XMOD) ||
 510                     ((eax & CPUID_XMOD) > CPUID_XMOD_REV_MASK)) {
 511                         printk(KERN_INFO PFX "Processor cpuid %x not supported\n", eax);
 512                         goto out;
 513                 }
 514
 515                 eax = cpuid_eax(CPUID_GET_MAX_CAPABILITIES);
 516                 if (eax < CPUID_FREQ_VOLT_CAPABILITIES) {
 517                         printk(KERN_INFO PFX
 518                                "No frequency change capabilities detected\n");
 519                         goto out;
 520                 }
 521
 522                 cpuid(CPUID_FREQ_VOLT_CAPABILITIES, &eax, &ebx, &ecx, &edx);
 523                 if ((edx & P_STATE_TRANSITION_CAPABLE) != P_STATE_TRANSITION_CAPABLE) {
 524                         printk(KERN_INFO PFX "Power state transitions not supported\n");
 525                         goto out;
 526                 }
 527         } else { /* must be a HW Pstate capable processor */
 528                 cpuid(CPUID_FREQ_VOLT_CAPABILITIES, &eax, &ebx, &ecx, &edx);
 529                 if ((edx & USE_HW_PSTATE) == USE_HW_PSTATE)
 530                         cpu_family = CPU_HW_PSTATE;
 531                 else
 532                         goto out;
 533         }
 534
 535         rc = 1;
 536
 537 out:
 538         set_cpus_allowed_ptr(current, &oldmask);
 539         return rc;
 540 }
 541
 542 static int check_pst_table(struct powernow_k8_data *data, struct pst_s *pst, u8 maxvid)
 543 {
 544         unsigned int j;
 545         u8 lastfid = 0xff;
 546
 547         for (j = 0; j < data->numps; j++) {
 548                 if (pst[j].vid > LEAST_VID) {
 549                         printk(KERN_ERR FW_BUG PFX "vid %d invalid : 0x%x\n",
 550                                j, pst[j].vid);
 551                         return -EINVAL;
 552                 }
 553                 if (pst[j].vid < data->rvo) {   /* vid + rvo >= 0 */
 554                         printk(KERN_ERR FW_BUG PFX "0 vid exceeded with pstate"
 555                                " %d\n", j);
 556                         return -ENODEV;
 557                 }
 558                 if (pst[j].vid < maxvid + data->rvo) {  /* vid + rvo >= maxvid */
 559                         printk(KERN_ERR FW_BUG PFX "maxvid exceeded with pstate"
 560                                " %d\n", j);
 561                         return -ENODEV;
 562                 }
 563                 if (pst[j].fid > MAX_FID) {
 564                         printk(KERN_ERR FW_BUG PFX "maxfid exceeded with pstate"
 565                                " %d\n", j);
 566                         return -ENODEV;
 567                 }
 568                 if (j && (pst[j].fid < HI_FID_TABLE_BOTTOM)) {
 569                         /* Only first fid is allowed to be in "low" range */
 570                         printk(KERN_ERR FW_BUG PFX "two low fids - %d : "
 571                                "0x%x\n", j, pst[j].fid);
 572                         return -EINVAL;
 573                 }
 574                 if (pst[j].fid < lastfid)
 575                         lastfid = pst[j].fid;
 576         }
 577         if (lastfid & 1) {
 578                 printk(KERN_ERR FW_BUG PFX "lastfid invalid\n");
 579                 return -EINVAL;
 580         }
 581         if (lastfid > LO_FID_TABLE_TOP)
 582                 printk(KERN_INFO FW_BUG PFX  "first fid not from lo freq table\n");
 583
 584         return 0;
 585 }
 586
 587 static void print_basics(struct powernow_k8_data *data)
 588 {
 589         int j;
 590         for (j = 0; j < data->numps; j++) {
 591                 if (data->powernow_table[j].frequency != CPUFREQ_ENTRY_INVALID) {
 592                         if (cpu_family == CPU_HW_PSTATE) {
 593                                 printk(KERN_INFO PFX "   %d : pstate %d (%d MHz)\n",
 594                                         j,
 595                                         data->powernow_table[j].index,
 596                                         data->powernow_table[j].frequency/1000);
 597                         } else {
 598                                 printk(KERN_INFO PFX "   %d : fid 0x%x (%d MHz), vid 0x%x\n",
 599                                         j,
 600                                         data->powernow_table[j].index & 0xff,
 601                                         data->powernow_table[j].frequency/1000,
 602                                         data->powernow_table[j].index >> 8);
 603                         }
 604                 }
 605         }
 606         if (data->batps)
 607                 printk(KERN_INFO PFX "Only %d pstates on battery\n", data->batps);
 608 }
 609
 610 static int fill_powernow_table(struct powernow_k8_data *data, struct pst_s *pst, u8 maxvid)
 611 {
 612         struct cpufreq_frequency_table *powernow_table;
 613         unsigned int j;
 614
 615         if (data->batps) {    /* use ACPI support to get full speed on mains power */
 616                 printk(KERN_WARNING PFX "Only %d pstates usable (use ACPI driver for full range\n", data->batps);
 617                 data->numps = data->batps;
 618         }
 619
 620         for ( j=1; j<data->numps; j++ ) {
 621                 if (pst[j-1].fid >= pst[j].fid) {
 622                         printk(KERN_ERR PFX "PST out of sequence\n");
 623                         return -EINVAL;
 624                 }
 625         }
 626
 627         if (data->numps < 2) {
 628                 printk(KERN_ERR PFX "no p states to transition\n");
 629                 return -ENODEV;
 630         }
 631
 632         if (check_pst_table(data, pst, maxvid))
 633                 return -EINVAL;
 634
 635         powernow_table = kmalloc((sizeof(struct cpufreq_frequency_table)
 636                 * (data->numps + 1)), GFP_KERNEL);
 637         if (!powernow_table) {
 638                 printk(KERN_ERR PFX "powernow_table memory alloc failure\n");
 639                 return -ENOMEM;
 640         }
 641
 642         for (j = 0; j < data->numps; j++) {
 643                 powernow_table[j].index = pst[j].fid; /* lower 8 bits */
 644                 powernow_table[j].index |= (pst[j].vid << 8); /* upper 8 bits */
 645                 powernow_table[j].frequency = find_khz_freq_from_fid(pst[j].fid);
 646         }
 647         powernow_table[data->numps].frequency = CPUFREQ_TABLE_END;
 648         powernow_table[data->numps].index = 0;
 649
 650         if (query_current_values_with_pending_wait(data)) {
 651                 kfree(powernow_table);
 652                 return -EIO;
 653         }
 654
 655         dprintk("cfid 0x%x, cvid 0x%x\n", data->currfid, data->currvid);
 656         data->powernow_table = powernow_table;
 657         if (first_cpu(per_cpu(cpu_core_map, data->cpu)) == data->cpu)
 658                 print_basics(data);
 659
 660         for (j = 0; j < data->numps; j++)
 661                 if ((pst[j].fid==data->currfid) && (pst[j].vid==data->currvid))
 662                         return 0;
 663
 664         dprintk("currfid/vid do not match PST, ignoring\n");
 665         return 0;
 666 }
 667
 668 /* Find and validate the PSB/PST table in BIOS. */
 669 static int find_psb_table(struct powernow_k8_data *data)
 670 {
 671         struct psb_s *psb;
 672         unsigned int i;
 673         u32 mvs;
 674         u8 maxvid;
 675         u32 cpst = 0;
 676         u32 thiscpuid;
 677
 678         for (i = 0xc0000; i < 0xffff0; i += 0x10) {
 679                 /* Scan BIOS looking for the signature. */
 680                 /* It can not be at ffff0 - it is too big. */
 681
 682                 psb = phys_to_virt(i);
 683                 if (memcmp(psb, PSB_ID_STRING, PSB_ID_STRING_LEN) != 0)
 684                         continue;
 685
 686                 dprintk("found PSB header at 0x%p\n", psb);
 687
 688                 dprintk("table vers: 0x%x\n", psb->tableversion);
 689                 if (psb->tableversion != PSB_VERSION_1_4) {
 690                         printk(KERN_ERR FW_BUG PFX "PSB table is not v1.4\n");
 691                         return -ENODEV;
 692                 }
 693
 694                 dprintk("flags: 0x%x\n", psb->flags1);
 695                 if (psb->flags1) {
 696                         printk(KERN_ERR FW_BUG PFX "unknown flags\n");
 697                         return -ENODEV;
 698                 }
 699
 700                 data->vstable = psb->vstable;
 701                 dprintk("voltage stabilization time: %d(*20us)\n", data->vstable);
 702
 703                 dprintk("flags2: 0x%x\n", psb->flags2);
 704                 data->rvo = psb->flags2 & 3;
 705                 data->irt = ((psb->flags2) >> 2) & 3;
 706                 mvs = ((psb->flags2) >> 4) & 3;
 707                 data->vidmvs = 1 << mvs;
 708                 data->batps = ((psb->flags2) >> 6) & 3;
 709
 710                 dprintk("ramp voltage offset: %d\n", data->rvo);
 711                 dprintk("isochronous relief time: %d\n", data->irt);
 712                 dprintk("maximum voltage step: %d - 0x%x\n", mvs, data->vidmvs);
 713
 714                 dprintk("numpst: 0x%x\n", psb->num_tables);
 715                 cpst = psb->num_tables;
 716                 if ((psb->cpuid == 0x00000fc0) || (psb->cpuid == 0x00000fe0) ){
 717                         thiscpuid = cpuid_eax(CPUID_PROCESSOR_SIGNATURE);
 718                         if ((thiscpuid == 0x00000fc0) || (thiscpuid == 0x00000fe0) ) {
 719                                 cpst = 1;
 720                         }
 721                 }
 722                 if (cpst != 1) {
 723                         printk(KERN_ERR FW_BUG PFX "numpst must be 1\n");
 724                         return -ENODEV;
 725                 }
 726
 727                 data->plllock = psb->plllocktime;
 728                 dprintk("plllocktime: 0x%x (units 1us)\n", psb->plllocktime);
 729                 dprintk("maxfid: 0x%x\n", psb->maxfid);
 730                 dprintk("maxvid: 0x%x\n", psb->maxvid);
 731                 maxvid = psb->maxvid;
 732
 733                 data->numps = psb->numps;
 734                 dprintk("numpstates: 0x%x\n", data->numps);
 735                 return fill_powernow_table(data, (struct pst_s *)(psb+1), maxvid);
 736         }
 737         /*
 738          * If you see this message, complain to BIOS manufacturer. If
 739          * he tells you "we do not support Linux" or some similar
 740          * nonsense, remember that Windows 2000 uses the same legacy
 741          * mechanism that the old Linux PSB driver uses. Tell them it
 742          * is broken with Windows 2000.
 743          *
 744          * The reference to the AMD documentation is chapter 9 in the
 745          * BIOS and Kernel Developer's Guide, which is available on
 746          * www.amd.com
 747          */
 748         printk(KERN_ERR PFX "BIOS error - no PSB or ACPI _PSS objects\n");
 749         return -ENODEV;
 750 }
 751
 752 #ifdef CONFIG_X86_POWERNOW_K8_ACPI
 753 static void powernow_k8_acpi_pst_values(struct powernow_k8_data *data, unsigned int index)
 754 {
 755         if (!data->acpi_data.state_count || (cpu_family == CPU_HW_PSTATE))
 756                 return;
 757
 758         data->irt = (data->acpi_data.states[index].control >> IRT_SHIFT) & IRT_MASK;
 759         data->rvo = (data->acpi_data.states[index].control >> RVO_SHIFT) & RVO_MASK;
 760         data->exttype = (data->acpi_data.states[index].control >> EXT_TYPE_SHIFT) & EXT_TYPE_MASK;
 761         data->plllock = (data->acpi_data.states[index].control >> PLL_L_SHIFT) & PLL_L_MASK;
 762         data->vidmvs = 1 << ((data->acpi_data.states[index].control >> MVS_SHIFT) & MVS_MASK);
 763         data->vstable = (data->acpi_data.states[index].control >> VST_SHIFT) & VST_MASK;
 764 }
 765
 766 static int powernow_k8_cpu_init_acpi(struct powernow_k8_data *data)
 767 {
 768         struct cpufreq_frequency_table *powernow_table;
 769         int ret_val = -ENODEV;
 770
 771         if (acpi_processor_register_performance(&data->acpi_data, data->cpu)) {
 772                 dprintk("register performance failed: bad ACPI data\n");
 773                 return -EIO;
 774         }
 775
 776         /* verify the data contained in the ACPI structures */
 777         if (data->acpi_data.state_count <= 1) {
 778                 dprintk("No ACPI P-States\n");
 779                 goto err_out;
 780         }
 781
 782         if ((data->acpi_data.control_register.space_id != ACPI_ADR_SPACE_FIXED_HARDWARE) ||
 783                 (data->acpi_data.status_register.space_id != ACPI_ADR_SPACE_FIXED_HARDWARE)) {
 784                 dprintk("Invalid control/status registers (%x - %x)\n",
 785                         data->acpi_data.control_register.space_id,
 786                         data->acpi_data.status_register.space_id);
 787                 goto err_out;
 788         }
 789
 790         /* fill in data->powernow_table */
 791         powernow_table = kmalloc((sizeof(struct cpufreq_frequency_table)
 792                 * (data->acpi_data.state_count + 1)), GFP_KERNEL);
 793         if (!powernow_table) {
 794                 dprintk("powernow_table memory alloc failure\n");
 795                 goto err_out;
 796         }
 797
 798         if (cpu_family == CPU_HW_PSTATE)
 799                 ret_val = fill_powernow_table_pstate(data, powernow_table);
 800         else
 801                 ret_val = fill_powernow_table_fidvid(data, powernow_table);
 802         if (ret_val)
 803                 goto err_out_mem;
 804
 805         powernow_table[data->acpi_data.state_count].frequency = CPUFREQ_TABLE_END;
 806         powernow_table[data->acpi_data.state_count].index = 0;
 807         data->powernow_table = powernow_table;
 808
 809         /* fill in data */
 810         data->numps = data->acpi_data.state_count;
 811         if (first_cpu(per_cpu(cpu_core_map, data->cpu)) == data->cpu)
 812                 print_basics(data);
 813         powernow_k8_acpi_pst_values(data, 0);
 814
 815         /* notify BIOS that we exist */
 816         acpi_processor_notify_smm(THIS_MODULE);
 817
 818         if (!alloc_cpumask_var(&data->acpi_data.shared_cpu_map, GFP_KERNEL)) {
 819                 printk(KERN_ERR PFX
 820                                 "unable to alloc powernow_k8_data cpumask\n");
 821                 ret_val = -ENOMEM;
 822                 goto err_out_mem;
 823         }
 824
 825         return 0;
 826
 827 err_out_mem:
 828         kfree(powernow_table);
 829
 830 err_out:
 831         acpi_processor_unregister_performance(&data->acpi_data, data->cpu);
 832
 833         /* data->acpi_data.state_count informs us at ->exit() whether ACPI was used */
 834         data->acpi_data.state_count = 0;
 835
 836         return ret_val;
 837 }
 838
 839 static int fill_powernow_table_pstate(struct powernow_k8_data *data, struct cpufreq_frequency_table *powernow_table)
 840 {
 841         int i;
 842         u32 hi = 0, lo = 0;
 843         rdmsr(MSR_PSTATE_CUR_LIMIT, hi, lo);
 844         data->max_hw_pstate = (hi & HW_PSTATE_MAX_MASK) >> HW_PSTATE_MAX_SHIFT;
 845
 846         for (i = 0; i < data->acpi_data.state_count; i++) {
 847                 u32 index;
 848
 849                 index = data->acpi_data.states[i].control & HW_PSTATE_MASK;
 850                 if (index > data->max_hw_pstate) {
 851                         printk(KERN_ERR PFX "invalid pstate %d - bad value %d.\n", i, index);
 852                         printk(KERN_ERR PFX "Please report to BIOS manufacturer\n");
 853                         powernow_table[i].frequency = CPUFREQ_ENTRY_INVALID;
 854                         continue;
 855                 }
 856                 rdmsr(MSR_PSTATE_DEF_BASE + index, lo, hi);
 857                 if (!(hi & HW_PSTATE_VALID_MASK)) {
 858                         dprintk("invalid pstate %d, ignoring\n", index);
 859                         powernow_table[i].frequency = CPUFREQ_ENTRY_INVALID;
 860                         continue;
 861                 }
 862
 863                 powernow_table[i].index = index;
 864
 865                 powernow_table[i].frequency = data->acpi_data.states[i].core_frequency * 1000;
 866         }
 867         return 0;
 868 }
 869
 870 static int fill_powernow_table_fidvid(struct powernow_k8_data *data, struct cpufreq_frequency_table *powernow_table)
 871 {
 872         int i;
 873         int cntlofreq = 0;
 874         for (i = 0; i < data->acpi_data.state_count; i++) {
 875                 u32 fid;
 876                 u32 vid;
 877
 878                 if (data->exttype) {
 879                         fid = data->acpi_data.states[i].status & EXT_FID_MASK;
 880                         vid = (data->acpi_data.states[i].status >> VID_SHIFT) & EXT_VID_MASK;
 881                 } else {
 882                         fid = data->acpi_data.states[i].control & FID_MASK;
 883                         vid = (data->acpi_data.states[i].control >> VID_SHIFT) & VID_MASK;
 884                 }
 885
 886                 dprintk("   %d : fid 0x%x, vid 0x%x\n", i, fid, vid);
 887
 888                 powernow_table[i].index = fid; /* lower 8 bits */
 889                 powernow_table[i].index |= (vid << 8); /* upper 8 bits */
 890                 powernow_table[i].frequency = find_khz_freq_from_fid(fid);
 891
 892                 /* verify frequency is OK */
 893                 if ((powernow_table[i].frequency > (MAX_FREQ * 1000)) ||
 894                         (powernow_table[i].frequency < (MIN_FREQ * 1000))) {
 895                         dprintk("invalid freq %u kHz, ignoring\n", powernow_table[i].frequency);
 896                         powernow_table[i].frequency = CPUFREQ_ENTRY_INVALID;
 897                         continue;
 898                 }
 899
 900                 /* verify voltage is OK - BIOSs are using "off" to indicate invalid */
 901                 if (vid == VID_OFF) {
 902                         dprintk("invalid vid %u, ignoring\n", vid);
 903                         powernow_table[i].frequency = CPUFREQ_ENTRY_INVALID;
 904                         continue;
 905                 }
 906
 907                 /* verify only 1 entry from the lo frequency table */
 908                 if (fid < HI_FID_TABLE_BOTTOM) {
 909                         if (cntlofreq) {
 910                                 /* if both entries are the same, ignore this one ... */
 911                                 if ((powernow_table[i].frequency != powernow_table[cntlofreq].frequency) ||
 912                                     (powernow_table[i].index != powernow_table[cntlofreq].index)) {
 913                                         printk(KERN_ERR PFX "Too many lo freq table entries\n");
 914                                         return 1;
 915                                 }
 916
 917                                 dprintk("double low frequency table entry, ignoring it.\n");
 918                                 powernow_table[i].frequency = CPUFREQ_ENTRY_INVALID;
 919                                 continue;
 920                         } else
 921                                 cntlofreq = i;
 922                 }
 923
 924                 if (powernow_table[i].frequency != (data->acpi_data.states[i].core_frequency * 1000)) {
 925                         printk(KERN_INFO PFX "invalid freq entries %u kHz vs. %u kHz\n",
 926                                 powernow_table[i].frequency,
 927                                 (unsigned int) (data->acpi_data.states[i].core_frequency * 1000));
 928                         powernow_table[i].frequency = CPUFREQ_ENTRY_INVALID;
 929                         continue;
 930                 }
 931         }
 932         return 0;
 933 }
 934
 935 static void powernow_k8_cpu_exit_acpi(struct powernow_k8_data *data)
 936 {
 937         if (data->acpi_data.state_count)
 938                 acpi_processor_unregister_performance(&data->acpi_data, data->cpu);
 939         free_cpumask_var(data->acpi_data.shared_cpu_map);
 940 }
 941
 942 #else
 943 static int powernow_k8_cpu_init_acpi(struct powernow_k8_data *data) { return -ENODEV; }
 944 static void powernow_k8_cpu_exit_acpi(struct powernow_k8_data *data) { return; }
 945 static void powernow_k8_acpi_pst_values(struct powernow_k8_data *data, unsigned int index) { return; }
 946 #endif /* CONFIG_X86_POWERNOW_K8_ACPI */
 947
 948 /* Take a frequency, and issue the fid/vid transition command */
 949 static int transition_frequency_fidvid(struct powernow_k8_data *data, unsigned int index)
 950 {
 951         u32 fid = 0;
 952         u32 vid = 0;
 953         int res, i;
 954         struct cpufreq_freqs freqs;
 955
 956         dprintk("cpu %d transition to index %u\n", smp_processor_id(), index);
 957
 958         /* fid/vid correctness check for k8 */
 959         /* fid are the lower 8 bits of the index we stored into
 960          * the cpufreq frequency table in find_psb_table, vid
 961          * are the upper 8 bits.
 962          */
 963         fid = data->powernow_table[index].index & 0xFF;
 964         vid = (data->powernow_table[index].index & 0xFF00) >> 8;
 965
 966         dprintk("table matched fid 0x%x, giving vid 0x%x\n", fid, vid);
 967
 968         if (query_current_values_with_pending_wait(data))
 969                 return 1;
 970
 971         if ((data->currvid == vid) && (data->currfid == fid)) {
 972                 dprintk("target matches current values (fid 0x%x, vid 0x%x)\n",
 973                         fid, vid);
 974                 return 0;
 975         }
 976
 977         if ((fid < HI_FID_TABLE_BOTTOM) && (data->currfid < HI_FID_TABLE_BOTTOM)) {
 978                 printk(KERN_ERR PFX
 979                        "ignoring illegal change in lo freq table-%x to 0x%x\n",
 980                        data->currfid, fid);
 981                 return 1;
 982         }
 983
 984         dprintk("cpu %d, changing to fid 0x%x, vid 0x%x\n",
 985                 smp_processor_id(), fid, vid);
 986         freqs.old = find_khz_freq_from_fid(data->currfid);
 987         freqs.new = find_khz_freq_from_fid(fid);
 988
 989         for_each_cpu_mask_nr(i, *(data->available_cores)) {
 990                 freqs.cpu = i;
 991                 cpufreq_notify_transition(&freqs, CPUFREQ_PRECHANGE);
 992         }
 993
 994         res = transition_fid_vid(data, fid, vid);
 995         freqs.new = find_khz_freq_from_fid(data->currfid);
 996
 997         for_each_cpu_mask_nr(i, *(data->available_cores)) {
 998                 freqs.cpu = i;
 999                 cpufreq_notify_transition(&freqs, CPUFREQ_POSTCHANGE);
1000         }
1001         return res;
1002 }
1003
1004 /* Take a frequency, and issue the hardware pstate transition command */
1005 static int transition_frequency_pstate(struct powernow_k8_data *data, unsigned int index)
1006 {
1007         u32 pstate = 0;
1008         int res, i;
1009         struct cpufreq_freqs freqs;
1010
1011         dprintk("cpu %d transition to index %u\n", smp_processor_id(), index);
1012
1013         /* get MSR index for hardware pstate transition */
1014         pstate = index & HW_PSTATE_MASK;
1015         if (pstate > data->max_hw_pstate)
1016                 return 0;
1017         freqs.old = find_khz_freq_from_pstate(data->powernow_table, data->currpstate);
1018         freqs.new = find_khz_freq_from_pstate(data->powernow_table, pstate);
1019
1020         for_each_cpu_mask_nr(i, *(data->available_cores)) {
1021                 freqs.cpu = i;
1022                 cpufreq_notify_transition(&freqs, CPUFREQ_PRECHANGE);
1023         }
1024
1025         res = transition_pstate(data, pstate);
1026         freqs.new = find_khz_freq_from_pstate(data->powernow_table, pstate);
1027
1028         for_each_cpu_mask_nr(i, *(data->available_cores)) {
1029                 freqs.cpu = i;
1030                 cpufreq_notify_transition(&freqs, CPUFREQ_POSTCHANGE);
1031         }
1032         return res;
1033 }
1034
1035 /* Driver entry point to switch to the target frequency */
1036 static int powernowk8_target(struct cpufreq_policy *pol, unsigned targfreq, unsigned relation)
1037 {
1038         cpumask_t oldmask;
1039         struct powernow_k8_data *data = per_cpu(powernow_data, pol->cpu);
1040         u32 checkfid;
1041         u32 checkvid;
1042         unsigned int newstate;
1043         int ret = -EIO;
1044
1045         if (!data)
1046                 return -EINVAL;
1047
1048         checkfid = data->currfid;
1049         checkvid = data->currvid;
1050
1051         /* only run on specific CPU from here on */
1052         oldmask = current->cpus_allowed;
1053         set_cpus_allowed_ptr(current, &cpumask_of_cpu(pol->cpu));
1054
1055         if (smp_processor_id() != pol->cpu) {
1056                 printk(KERN_ERR PFX "limiting to cpu %u failed\n", pol->cpu);
1057                 goto err_out;
1058         }
1059
1060         if (pending_bit_stuck()) {
1061                 printk(KERN_ERR PFX "failing targ, change pending bit set\n");
1062                 goto err_out;
1063         }
1064
1065         dprintk("targ: cpu %d, %d kHz, min %d, max %d, relation %d\n",
1066                 pol->cpu, targfreq, pol->min, pol->max, relation);
1067
1068         if (query_current_values_with_pending_wait(data))
1069                 goto err_out;
1070
1071         if (cpu_family != CPU_HW_PSTATE) {
1072                 dprintk("targ: curr fid 0x%x, vid 0x%x\n",
1073                 data->currfid, data->currvid);
1074
1075                 if ((checkvid != data->currvid) || (checkfid != data->currfid)) {
1076                         printk(KERN_INFO PFX
1077                                 "error - out of sync, fix 0x%x 0x%x, vid 0x%x 0x%x\n",
1078                                 checkfid, data->currfid, checkvid, data->currvid);
1079                 }
1080         }
1081
1082         if (cpufreq_frequency_table_target(pol, data->powernow_table, targfreq, relation, &newstate))
1083                 goto err_out;
1084
1085         mutex_lock(&fidvid_mutex);
1086
1087         powernow_k8_acpi_pst_values(data, newstate);
1088
1089         if (cpu_family == CPU_HW_PSTATE)
1090                 ret = transition_frequency_pstate(data, newstate);
1091         else
1092                 ret = transition_frequency_fidvid(data, newstate);
1093         if (ret) {
1094                 printk(KERN_ERR PFX "transition frequency failed\n");
1095                 ret = 1;
1096                 mutex_unlock(&fidvid_mutex);
1097                 goto err_out;
1098         }
1099         mutex_unlock(&fidvid_mutex);
1100
1101         if (cpu_family == CPU_HW_PSTATE)
1102                 pol->cur = find_khz_freq_from_pstate(data->powernow_table, newstate);
1103         else
1104                 pol->cur = find_khz_freq_from_fid(data->currfid);
1105         ret = 0;
1106
1107 err_out:
1108         set_cpus_allowed_ptr(current, &oldmask);
1109         return ret;
1110 }
1111
1112 /* Driver entry point to verify the policy and range of frequencies */
1113 static int powernowk8_verify(struct cpufreq_policy *pol)
1114 {
1115         struct powernow_k8_data *data = per_cpu(powernow_data, pol->cpu);
1116
1117         if (!data)
1118                 return -EINVAL;
1119
1120         return cpufreq_frequency_table_verify(pol, data->powernow_table);
1121 }
1122
1123 /* per CPU init entry point to the driver */
1124 static int __cpuinit powernowk8_cpu_init(struct cpufreq_policy *pol)
1125 {
1126         struct powernow_k8_data *data;
1127         cpumask_t oldmask;
1128         int rc;
1129
1130         if (!cpu_online(pol->cpu))
1131                 return -ENODEV;
1132
1133         if (!check_supported_cpu(pol->cpu))
1134                 return -ENODEV;
1135
1136         data = kzalloc(sizeof(struct powernow_k8_data), GFP_KERNEL);
1137         if (!data) {
1138                 printk(KERN_ERR PFX "unable to alloc powernow_k8_data");
1139                 return -ENOMEM;
1140         }
1141
1142         data->cpu = pol->cpu;
1143         data->currpstate = HW_PSTATE_INVALID;
1144
1145         rc = powernow_k8_cpu_init_acpi(data);
1146         if (rc) {
1147                 /*
1148                  * Use the PSB BIOS structure. This is only availabe on
1149                  * an UP version, and is deprecated by AMD.
1150                  */
1151                 if (num_online_cpus() != 1) {
1152 #ifndef CONFIG_ACPI_PROCESSOR
1153                         printk(KERN_ERR PFX "ACPI Processor support is required "
1154                                "for SMP systems but is absent. Please load the "
1155                                "ACPI Processor module before starting this "
1156                                "driver.\n");
1157 #else
1158                         printk(KERN_ERR FW_BUG PFX "Your BIOS does not provide"
1159                                " ACPI _PSS objects in a way that Linux "
1160                                "understands. Please report this to the Linux "
1161                                "ACPI maintainers and complain to your BIOS "
1162                                "vendor.\n");
1163 #endif
1164                         goto err_out;
1165                 }
1166                 if (pol->cpu != 0) {
1167                         printk(KERN_ERR FW_BUG PFX "No ACPI _PSS objects for "
1168                                "CPU other than CPU0. Complain to your BIOS "
1169                                "vendor.\n");
1170                         goto err_out;
1171                 }
1172                 rc = find_psb_table(data);
1173                 if (rc) {
1174                         goto err_out;
1175                 }
1176         }
1177
1178         /* only run on specific CPU from here on */
1179         oldmask = current->cpus_allowed;
1180         set_cpus_allowed_ptr(current, &cpumask_of_cpu(pol->cpu));
1181
1182         if (smp_processor_id() != pol->cpu) {
1183                 printk(KERN_ERR PFX "limiting to cpu %u failed\n", pol->cpu);
1184                 goto err_out;
1185         }
1186
1187         if (pending_bit_stuck()) {
1188                 printk(KERN_ERR PFX "failing init, change pending bit set\n");
1189                 goto err_out;
1190         }
1191
1192         if (query_current_values_with_pending_wait(data))
1193                 goto err_out;
1194
1195         if (cpu_family == CPU_OPTERON)
1196                 fidvid_msr_init();
1197
1198         /* run on any CPU again */
1199         set_cpus_allowed_ptr(current, &oldmask);
1200
1201         if (cpu_family == CPU_HW_PSTATE)
1202                 pol->cpus = cpumask_of_cpu(pol->cpu);
1203         else
1204                 pol->cpus = per_cpu(cpu_core_map, pol->cpu);
1205         data->available_cores = &(pol->cpus);
1206
1207         /* Take a crude guess here.
1208          * That guess was in microseconds, so multiply with 1000 */
1209         pol->cpuinfo.transition_latency = (((data->rvo + 8) * data->vstable * VST_UNITS_20US)
1210             + (3 * (1 << data->irt) * 10)) * 1000;
1211
1212         if (cpu_family == CPU_HW_PSTATE)
1213                 pol->cur = find_khz_freq_from_pstate(data->powernow_table, data->currpstate);
1214         else
1215                 pol->cur = find_khz_freq_from_fid(data->currfid);
1216         dprintk("policy current frequency %d kHz\n", pol->cur);
1217
1218         /* min/max the cpu is capable of */
1219         if (cpufreq_frequency_table_cpuinfo(pol, data->powernow_table)) {
1220                 printk(KERN_ERR FW_BUG PFX "invalid powernow_table\n");
1221                 powernow_k8_cpu_exit_acpi(data);
1222                 kfree(data->powernow_table);
1223                 kfree(data);
1224                 return -EINVAL;
1225         }
1226
1227         cpufreq_frequency_table_get_attr(data->powernow_table, pol->cpu);
1228
1229         if (cpu_family == CPU_HW_PSTATE)
1230                 dprintk("cpu_init done, current pstate 0x%x\n", data->currpstate);
1231         else
1232                 dprintk("cpu_init done, current fid 0x%x, vid 0x%x\n",
1233                         data->currfid, data->currvid);
1234
1235         per_cpu(powernow_data, pol->cpu) = data;
1236
1237         return 0;
1238
1239 err_out:
1240         set_cpus_allowed_ptr(current, &oldmask);
1241         powernow_k8_cpu_exit_acpi(data);
1242
1243         kfree(data);
1244         return -ENODEV;
1245 }
1246
1247 static int __devexit powernowk8_cpu_exit (struct cpufreq_policy *pol)
1248 {
1249         struct powernow_k8_data *data = per_cpu(powernow_data, pol->cpu);
1250
1251         if (!data)
1252                 return -EINVAL;
1253
1254         powernow_k8_cpu_exit_acpi(data);
1255
1256         cpufreq_frequency_table_put_attr(pol->cpu);
1257
1258         kfree(data->powernow_table);
1259         kfree(data);
1260
1261         return 0;
1262 }
1263
1264 static unsigned int powernowk8_get (unsigned int cpu)
1265 {
1266         struct powernow_k8_data *data;
1267         cpumask_t oldmask = current->cpus_allowed;
1268         unsigned int khz = 0;
1269         unsigned int first;
1270
1271         first = first_cpu(per_cpu(cpu_core_map, cpu));
1272         data = per_cpu(powernow_data, first);
1273
1274         if (!data)
1275                 return -EINVAL;
1276
1277         set_cpus_allowed_ptr(current, &cpumask_of_cpu(cpu));
1278         if (smp_processor_id() != cpu) {
1279                 printk(KERN_ERR PFX
1280                         "limiting to CPU %d failed in powernowk8_get\n", cpu);
1281                 set_cpus_allowed_ptr(current, &oldmask);
1282                 return 0;
1283         }
1284
1285         if (query_current_values_with_pending_wait(data))
1286                 goto out;
1287
1288         if (cpu_family == CPU_HW_PSTATE)
1289                 khz = find_khz_freq_from_pstate(data->powernow_table,
1290                                                 data->currpstate);
1291         else
1292                 khz = find_khz_freq_from_fid(data->currfid);
1293
1294
1295 out:
1296         set_cpus_allowed_ptr(current, &oldmask);
1297         return khz;
1298 }
1299
1300 static struct freq_attr* powernow_k8_attr[] = {
1301         &cpufreq_freq_attr_scaling_available_freqs,
1302         NULL,
1303 };
1304
1305 static struct cpufreq_driver cpufreq_amd64_driver = {
1306         .verify = powernowk8_verify,
1307         .target = powernowk8_target,
1308         .init = powernowk8_cpu_init,
1309         .exit = __devexit_p(powernowk8_cpu_exit),
1310         .get = powernowk8_get,
1311         .name = "powernow-k8",
1312         .owner = THIS_MODULE,
1313         .attr = powernow_k8_attr,
1314 };
1315
1316 /* driver entry point for init */
1317 static int __cpuinit powernowk8_init(void)
1318 {
1319         unsigned int i, supported_cpus = 0;
1320
1321         for_each_online_cpu(i) {
1322                 if (check_supported_cpu(i))
1323                         supported_cpus++;
1324         }
1325
1326         if (supported_cpus == num_online_cpus()) {
1327                 printk(KERN_INFO PFX "Found %d %s "
1328                         "processors (%d cpu cores) (" VERSION ")\n",
1329                         num_online_nodes(),
1330                         boot_cpu_data.x86_model_id, supported_cpus);
1331                 return cpufreq_register_driver(&cpufreq_amd64_driver);
1332         }
1333
1334         return -ENODEV;
1335 }
1336
1337 /* driver entry point for term */
1338 static void __exit powernowk8_exit(void)
1339 {
1340         dprintk("exit\n");
1341
1342         cpufreq_unregister_driver(&cpufreq_amd64_driver);
1343 }
1344
1345 MODULE_AUTHOR("Paul Devriendt <paul.devriendt@amd.com> and Mark Langsdorf <mark.langsdorf@amd.com>");
1346 MODULE_DESCRIPTION("AMD Athlon 64 and Opteron processor frequency driver.");
1347 MODULE_LICENSE("GPL");
1348
1349 late_initcall(powernowk8_init);
1350 module_exit(powernowk8_exit);