arch/x86/kernel/cpu/cpufreq/powernow-k8.c

   1
   2 /*
   3  *   (c) 2003-2006 Advanced Micro Devices, Inc.
   4  *  Your use of this code is subject to the terms and conditions of the
   5  *  GNU general public license version 2. See "COPYING" or
   6  *  http://www.gnu.org/licenses/gpl.html
   7  *
   8  *  Support : mark.langsdorf@amd.com
   9  *
  10  *  Based on the powernow-k7.c module written by Dave Jones.
  11  *  (C) 2003 Dave Jones on behalf of SuSE Labs
  12  *  (C) 2004 Dominik Brodowski <linux@brodo.de>
  13  *  (C) 2004 Pavel Machek <pavel@suse.cz>
  14  *  Licensed under the terms of the GNU GPL License version 2.
  15  *  Based upon datasheets & sample CPUs kindly provided by AMD.
  16  *
  17  *  Valuable input gratefully received from Dave Jones, Pavel Machek,
  18  *  Dominik Brodowski, Jacob Shin, and others.
  19  *  Originally developed by Paul Devriendt.
  20  *  Processor information obtained from Chapter 9 (Power and Thermal Management)
  21  *  of the "BIOS and Kernel Developer's Guide for the AMD Athlon 64 and AMD
  22  *  Opteron Processors" available for download from www.amd.com
  23  *
  24  *  Tables for specific CPUs can be inferred from
  25  *     http://www.amd.com/us-en/assets/content_type/white_papers_and_tech_docs/30430.pdf
  26  */
  27
  28 #include <linux/kernel.h>
  29 #include <linux/smp.h>
  30 #include <linux/module.h>
  31 #include <linux/init.h>
  32 #include <linux/cpufreq.h>
  33 #include <linux/slab.h>
  34 #include <linux/string.h>
  35 #include <linux/cpumask.h>
  36 #include <linux/sched.h>        /* for current / set_cpus_allowed() */
  37 #include <linux/io.h>
  38 #include <linux/delay.h>
  39
  40 #include <asm/msr.h>
  41
  42 #include <linux/acpi.h>
  43 #include <linux/mutex.h>
  44 #include <acpi/processor.h>
  45
  46 #define PFX "powernow-k8: "
  47 #define VERSION "version 2.20.00"
  48 #include "powernow-k8.h"
  49
  50 /* serialize freq changes  */
  51 static DEFINE_MUTEX(fidvid_mutex);
  52
  53 static DEFINE_PER_CPU(struct powernow_k8_data *, powernow_data);
  54
  55 static int cpu_family = CPU_OPTERON;
  56
  57 #ifndef CONFIG_SMP
  58 static inline const struct cpumask *cpu_core_mask(int cpu)
  59 {
  60         return cpumask_of(0);
  61 }
  62 #endif
  63
  64 /* Return a frequency in MHz, given an input fid */
  65 static u32 find_freq_from_fid(u32 fid)
  66 {
  67         return 800 + (fid * 100);
  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,
  77                 u32 pstate)
  78 {
  79         return data[pstate].frequency;
  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
 125                 /*
 126                  * a workaround for family 11h erratum 311 might cause
 127                  * an "out-of-range Pstate if the core is in Pstate-0
 128                  */
 129                 if ((boot_cpu_data.x86 == 0x11) && (i >= data->numps))
 130                         data->currpstate = HW_PSTATE_0;
 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;
 190         lo |= (data->currvid << MSR_C_LO_VID_SHIFT);
 191         lo |= MSR_C_LO_INIT_FID_VID;
 192
 193         dprintk("writing fid 0x%x, lo 0x%x, hi 0x%x\n",
 194                 fid, lo, data->plllock * PLL_LOCK_CONVERSION);
 195
 196         do {
 197                 wrmsr(MSR_FIDVID_CTL, lo, data->plllock * PLL_LOCK_CONVERSION);
 198                 if (i++ > 100) {
 199                         printk(KERN_ERR PFX
 200                                 "Hardware error - pending bit very stuck - "
 201                                 "no further pstate changes possible\n");
 202                         return 1;
 203                 }
 204         } while (query_current_values_with_pending_wait(data));
 205
 206         count_off_irt(data);
 207
 208         if (savevid != data->currvid) {
 209                 printk(KERN_ERR PFX
 210                         "vid change on fid trans, old 0x%x, new 0x%x\n",
 211                         savevid, data->currvid);
 212                 return 1;
 213         }
 214
 215         if (fid != data->currfid) {
 216                 printk(KERN_ERR PFX
 217                         "fid trans failed, fid 0x%x, curr 0x%x\n", fid,
 218                         data->currfid);
 219                 return 1;
 220         }
 221
 222         return 0;
 223 }
 224
 225 /* Write a new vid to the hardware */
 226 static int write_new_vid(struct powernow_k8_data *data, u32 vid)
 227 {
 228         u32 lo;
 229         u32 savefid = data->currfid;
 230         int i = 0;
 231
 232         if ((data->currfid & INVALID_FID_MASK) || (vid & INVALID_VID_MASK)) {
 233                 printk(KERN_ERR PFX "internal error - overflow on vid write\n");
 234                 return 1;
 235         }
 236
 237         lo = data->currfid;
 238         lo |= (vid << MSR_C_LO_VID_SHIFT);
 239         lo |= MSR_C_LO_INIT_FID_VID;
 240
 241         dprintk("writing vid 0x%x, lo 0x%x, hi 0x%x\n",
 242                 vid, lo, STOP_GRANT_5NS);
 243
 244         do {
 245                 wrmsr(MSR_FIDVID_CTL, lo, STOP_GRANT_5NS);
 246                 if (i++ > 100) {
 247                         printk(KERN_ERR PFX "internal error - pending bit "
 248                                         "very stuck - no further pstate "
 249                                         "changes possible\n");
 250                         return 1;
 251                 }
 252         } while (query_current_values_with_pending_wait(data));
 253
 254         if (savefid != data->currfid) {
 255                 printk(KERN_ERR PFX "fid changed on vid trans, old "
 256                         "0x%x new 0x%x\n",
 257                        savefid, data->currfid);
 258                 return 1;
 259         }
 260
 261         if (vid != data->currvid) {
 262                 printk(KERN_ERR PFX "vid trans failed, vid 0x%x, "
 263                                 "curr 0x%x\n",
 264                                 vid, data->currvid);
 265                 return 1;
 266         }
 267
 268         return 0;
 269 }
 270
 271 /*
 272  * Reduce the vid by the max of step or reqvid.
 273  * Decreasing vid codes represent increasing voltages:
 274  * vid of 0 is 1.550V, vid of 0x1e is 0.800V, vid of VID_OFF is off.
 275  */
 276 static int decrease_vid_code_by_step(struct powernow_k8_data *data,
 277                 u32 reqvid, u32 step)
 278 {
 279         if ((data->currvid - reqvid) > step)
 280                 reqvid = data->currvid - step;
 281
 282         if (write_new_vid(data, reqvid))
 283                 return 1;
 284
 285         count_off_vst(data);
 286
 287         return 0;
 288 }
 289
 290 /* Change hardware pstate by single MSR write */
 291 static int transition_pstate(struct powernow_k8_data *data, u32 pstate)
 292 {
 293         wrmsr(MSR_PSTATE_CTRL, pstate, 0);
 294         data->currpstate = pstate;
 295         return 0;
 296 }
 297
 298 /* Change Opteron/Athlon64 fid and vid, by the 3 phases. */
 299 static int transition_fid_vid(struct powernow_k8_data *data,
 300                 u32 reqfid, u32 reqvid)
 301 {
 302         if (core_voltage_pre_transition(data, reqvid, reqfid))
 303                 return 1;
 304
 305         if (core_frequency_transition(data, reqfid))
 306                 return 1;
 307
 308         if (core_voltage_post_transition(data, reqvid))
 309                 return 1;
 310
 311         if (query_current_values_with_pending_wait(data))
 312                 return 1;
 313
 314         if ((reqfid != data->currfid) || (reqvid != data->currvid)) {
 315                 printk(KERN_ERR PFX "failed (cpu%d): req 0x%x 0x%x, "
 316                                 "curr 0x%x 0x%x\n",
 317                                 smp_processor_id(),
 318                                 reqfid, reqvid, data->currfid, data->currvid);
 319                 return 1;
 320         }
 321
 322         dprintk("transitioned (cpu%d): new fid 0x%x, vid 0x%x\n",
 323                 smp_processor_id(), data->currfid, data->currvid);
 324
 325         return 0;
 326 }
 327
 328 /* Phase 1 - core voltage transition ... setup voltage */
 329 static int core_voltage_pre_transition(struct powernow_k8_data *data,
 330                 u32 reqvid, u32 reqfid)
 331 {
 332         u32 rvosteps = data->rvo;
 333         u32 savefid = data->currfid;
 334         u32 maxvid, lo, rvomult = 1;
 335
 336         dprintk("ph1 (cpu%d): start, currfid 0x%x, currvid 0x%x, "
 337                 "reqvid 0x%x, rvo 0x%x\n",
 338                 smp_processor_id(),
 339                 data->currfid, data->currvid, reqvid, data->rvo);
 340
 341         if ((savefid < LO_FID_TABLE_TOP) && (reqfid < LO_FID_TABLE_TOP))
 342                 rvomult = 2;
 343         rvosteps *= rvomult;
 344         rdmsr(MSR_FIDVID_STATUS, lo, maxvid);
 345         maxvid = 0x1f & (maxvid >> 16);
 346         dprintk("ph1 maxvid=0x%x\n", maxvid);
 347         if (reqvid < maxvid) /* lower numbers are higher voltages */
 348                 reqvid = maxvid;
 349
 350         while (data->currvid > reqvid) {
 351                 dprintk("ph1: curr 0x%x, req vid 0x%x\n",
 352                         data->currvid, reqvid);
 353                 if (decrease_vid_code_by_step(data, reqvid, data->vidmvs))
 354                         return 1;
 355         }
 356
 357         while ((rvosteps > 0) &&
 358                         ((rvomult * data->rvo + data->currvid) > reqvid)) {
 359                 if (data->currvid == maxvid) {
 360                         rvosteps = 0;
 361                 } else {
 362                         dprintk("ph1: changing vid for rvo, req 0x%x\n",
 363                                 data->currvid - 1);
 364                         if (decrease_vid_code_by_step(data, data->currvid-1, 1))
 365                                 return 1;
 366                         rvosteps--;
 367                 }
 368         }
 369
 370         if (query_current_values_with_pending_wait(data))
 371                 return 1;
 372
 373         if (savefid != data->currfid) {
 374                 printk(KERN_ERR PFX "ph1 err, currfid changed 0x%x\n",
 375                                 data->currfid);
 376                 return 1;
 377         }
 378
 379         dprintk("ph1 complete, currfid 0x%x, currvid 0x%x\n",
 380                 data->currfid, data->currvid);
 381
 382         return 0;
 383 }
 384
 385 /* Phase 2 - core frequency transition */
 386 static int core_frequency_transition(struct powernow_k8_data *data, u32 reqfid)
 387 {
 388         u32 vcoreqfid, vcocurrfid, vcofiddiff;
 389         u32 fid_interval, savevid = data->currvid;
 390
 391         if (data->currfid == reqfid) {
 392                 printk(KERN_ERR PFX "ph2 null fid transition 0x%x\n",
 393                                 data->currfid);
 394                 return 0;
 395         }
 396
 397         dprintk("ph2 (cpu%d): starting, currfid 0x%x, currvid 0x%x, "
 398                 "reqfid 0x%x\n",
 399                 smp_processor_id(),
 400                 data->currfid, data->currvid, reqfid);
 401
 402         vcoreqfid = convert_fid_to_vco_fid(reqfid);
 403         vcocurrfid = convert_fid_to_vco_fid(data->currfid);
 404         vcofiddiff = vcocurrfid > vcoreqfid ? vcocurrfid - vcoreqfid
 405             : vcoreqfid - vcocurrfid;
 406
 407         if ((reqfid <= LO_FID_TABLE_TOP) && (data->currfid <= LO_FID_TABLE_TOP))
 408                 vcofiddiff = 0;
 409
 410         while (vcofiddiff > 2) {
 411                 (data->currfid & 1) ? (fid_interval = 1) : (fid_interval = 2);
 412
 413                 if (reqfid > data->currfid) {
 414                         if (data->currfid > LO_FID_TABLE_TOP) {
 415                                 if (write_new_fid(data,
 416                                                 data->currfid + fid_interval))
 417                                         return 1;
 418                         } else {
 419                                 if (write_new_fid
 420                                     (data,
 421                                      2 + convert_fid_to_vco_fid(data->currfid)))
 422                                         return 1;
 423                         }
 424                 } else {
 425                         if (write_new_fid(data, data->currfid - fid_interval))
 426                                 return 1;
 427                 }
 428
 429                 vcocurrfid = convert_fid_to_vco_fid(data->currfid);
 430                 vcofiddiff = vcocurrfid > vcoreqfid ? vcocurrfid - vcoreqfid
 431                     : vcoreqfid - vcocurrfid;
 432         }
 433
 434         if (write_new_fid(data, reqfid))
 435                 return 1;
 436
 437         if (query_current_values_with_pending_wait(data))
 438                 return 1;
 439
 440         if (data->currfid != reqfid) {
 441                 printk(KERN_ERR PFX
 442                         "ph2: mismatch, failed fid transition, "
 443                         "curr 0x%x, req 0x%x\n",
 444                         data->currfid, reqfid);
 445                 return 1;
 446         }
 447
 448         if (savevid != data->currvid) {
 449                 printk(KERN_ERR PFX "ph2: vid changed, save 0x%x, curr 0x%x\n",
 450                         savevid, data->currvid);
 451                 return 1;
 452         }
 453
 454         dprintk("ph2 complete, currfid 0x%x, currvid 0x%x\n",
 455                 data->currfid, data->currvid);
 456
 457         return 0;
 458 }
 459
 460 /* Phase 3 - core voltage transition flow ... jump to the final vid. */
 461 static int core_voltage_post_transition(struct powernow_k8_data *data,
 462                 u32 reqvid)
 463 {
 464         u32 savefid = data->currfid;
 465         u32 savereqvid = reqvid;
 466
 467         dprintk("ph3 (cpu%d): starting, currfid 0x%x, currvid 0x%x\n",
 468                 smp_processor_id(),
 469                 data->currfid, data->currvid);
 470
 471         if (reqvid != data->currvid) {
 472                 if (write_new_vid(data, reqvid))
 473                         return 1;
 474
 475                 if (savefid != data->currfid) {
 476                         printk(KERN_ERR PFX
 477                                "ph3: bad fid change, save 0x%x, curr 0x%x\n",
 478                                savefid, data->currfid);
 479                         return 1;
 480                 }
 481
 482                 if (data->currvid != reqvid) {
 483                         printk(KERN_ERR PFX
 484                                "ph3: failed vid transition\n, "
 485                                "req 0x%x, curr 0x%x",
 486                                reqvid, data->currvid);
 487                         return 1;
 488                 }
 489         }
 490
 491         if (query_current_values_with_pending_wait(data))
 492                 return 1;
 493
 494         if (savereqvid != data->currvid) {
 495                 dprintk("ph3 failed, currvid 0x%x\n", data->currvid);
 496                 return 1;
 497         }
 498
 499         if (savefid != data->currfid) {
 500                 dprintk("ph3 failed, currfid changed 0x%x\n",
 501                         data->currfid);
 502                 return 1;
 503         }
 504
 505         dprintk("ph3 complete, currfid 0x%x, currvid 0x%x\n",
 506                 data->currfid, data->currvid);
 507
 508         return 0;
 509 }
 510
 511 static void check_supported_cpu(void *_rc)
 512 {
 513         u32 eax, ebx, ecx, edx;
 514         int *rc = _rc;
 515
 516         *rc = -ENODEV;
 517
 518         if (current_cpu_data.x86_vendor != X86_VENDOR_AMD)
 519                 return;
 520
 521         eax = cpuid_eax(CPUID_PROCESSOR_SIGNATURE);
 522         if (((eax & CPUID_XFAM) != CPUID_XFAM_K8) &&
 523             ((eax & CPUID_XFAM) < CPUID_XFAM_10H))
 524                 return;
 525
 526         if ((eax & CPUID_XFAM) == CPUID_XFAM_K8) {
 527                 if (((eax & CPUID_USE_XFAM_XMOD) != CPUID_USE_XFAM_XMOD) ||
 528                     ((eax & CPUID_XMOD) > CPUID_XMOD_REV_MASK)) {
 529                         printk(KERN_INFO PFX
 530                                 "Processor cpuid %x not supported\n", eax);
 531                         return;
 532                 }
 533
 534                 eax = cpuid_eax(CPUID_GET_MAX_CAPABILITIES);
 535                 if (eax < CPUID_FREQ_VOLT_CAPABILITIES) {
 536                         printk(KERN_INFO PFX
 537                                "No frequency change capabilities detected\n");
 538                         return;
 539                 }
 540
 541                 cpuid(CPUID_FREQ_VOLT_CAPABILITIES, &eax, &ebx, &ecx, &edx);
 542                 if ((edx & P_STATE_TRANSITION_CAPABLE)
 543                         != P_STATE_TRANSITION_CAPABLE) {
 544                         printk(KERN_INFO PFX
 545                                 "Power state transitions not supported\n");
 546                         return;
 547                 }
 548         } else { /* must be a HW Pstate capable processor */
 549                 cpuid(CPUID_FREQ_VOLT_CAPABILITIES, &eax, &ebx, &ecx, &edx);
 550                 if ((edx & USE_HW_PSTATE) == USE_HW_PSTATE)
 551                         cpu_family = CPU_HW_PSTATE;
 552                 else
 553                         return;
 554         }
 555
 556         *rc = 0;
 557 }
 558
 559 static int check_pst_table(struct powernow_k8_data *data, struct pst_s *pst,
 560                 u8 maxvid)
 561 {
 562         unsigned int j;
 563         u8 lastfid = 0xff;
 564
 565         for (j = 0; j < data->numps; j++) {
 566                 if (pst[j].vid > LEAST_VID) {
 567                         printk(KERN_ERR FW_BUG PFX "vid %d invalid : 0x%x\n",
 568                                j, pst[j].vid);
 569                         return -EINVAL;
 570                 }
 571                 if (pst[j].vid < data->rvo) {
 572                         /* vid + rvo >= 0 */
 573                         printk(KERN_ERR FW_BUG PFX "0 vid exceeded with pstate"
 574                                " %d\n", j);
 575                         return -ENODEV;
 576                 }
 577                 if (pst[j].vid < maxvid + data->rvo) {
 578                         /* vid + rvo >= maxvid */
 579                         printk(KERN_ERR FW_BUG PFX "maxvid exceeded with pstate"
 580                                " %d\n", j);
 581                         return -ENODEV;
 582                 }
 583                 if (pst[j].fid > MAX_FID) {
 584                         printk(KERN_ERR FW_BUG PFX "maxfid exceeded with pstate"
 585                                " %d\n", j);
 586                         return -ENODEV;
 587                 }
 588                 if (j && (pst[j].fid < HI_FID_TABLE_BOTTOM)) {
 589                         /* Only first fid is allowed to be in "low" range */
 590                         printk(KERN_ERR FW_BUG PFX "two low fids - %d : "
 591                                "0x%x\n", j, pst[j].fid);
 592                         return -EINVAL;
 593                 }
 594                 if (pst[j].fid < lastfid)
 595                         lastfid = pst[j].fid;
 596         }
 597         if (lastfid & 1) {
 598                 printk(KERN_ERR FW_BUG PFX "lastfid invalid\n");
 599                 return -EINVAL;
 600         }
 601         if (lastfid > LO_FID_TABLE_TOP)
 602                 printk(KERN_INFO FW_BUG PFX
 603                         "first fid not from lo freq table\n");
 604
 605         return 0;
 606 }
 607
 608 static void invalidate_entry(struct cpufreq_frequency_table *powernow_table,
 609                 unsigned int entry)
 610 {
 611         powernow_table[entry].frequency = CPUFREQ_ENTRY_INVALID;
 612 }
 613
 614 static void print_basics(struct powernow_k8_data *data)
 615 {
 616         int j;
 617         for (j = 0; j < data->numps; j++) {
 618                 if (data->powernow_table[j].frequency !=
 619                                 CPUFREQ_ENTRY_INVALID) {
 620                         if (cpu_family == CPU_HW_PSTATE) {
 621                                 printk(KERN_INFO PFX
 622                                         "   %d : pstate %d (%d MHz)\n", j,
 623                                         data->powernow_table[j].index,
 624                                         data->powernow_table[j].frequency/1000);
 625                         } else {
 626                                 printk(KERN_INFO PFX
 627                                         "   %d : fid 0x%x (%d MHz), vid 0x%x\n",
 628                                         j,
 629                                         data->powernow_table[j].index & 0xff,
 630                                         data->powernow_table[j].frequency/1000,
 631                                         data->powernow_table[j].index >> 8);
 632                         }
 633                 }
 634         }
 635         if (data->batps)
 636                 printk(KERN_INFO PFX "Only %d pstates on battery\n",
 637                                 data->batps);
 638 }
 639
 640 static u32 freq_from_fid_did(u32 fid, u32 did)
 641 {
 642         u32 mhz = 0;
 643
 644         if (boot_cpu_data.x86 == 0x10)
 645                 mhz = (100 * (fid + 0x10)) >> did;
 646         else if (boot_cpu_data.x86 == 0x11)
 647                 mhz = (100 * (fid + 8)) >> did;
 648         else
 649                 BUG();
 650
 651         return mhz * 1000;
 652 }
 653
 654 static int fill_powernow_table(struct powernow_k8_data *data,
 655                 struct pst_s *pst, u8 maxvid)
 656 {
 657         struct cpufreq_frequency_table *powernow_table;
 658         unsigned int j;
 659
 660         if (data->batps) {
 661                 /* use ACPI support to get full speed on mains power */
 662                 printk(KERN_WARNING PFX
 663                         "Only %d pstates usable (use ACPI driver for full "
 664                         "range\n", data->batps);
 665                 data->numps = data->batps;
 666         }
 667
 668         for (j = 1; j < data->numps; j++) {
 669                 if (pst[j-1].fid >= pst[j].fid) {
 670                         printk(KERN_ERR PFX "PST out of sequence\n");
 671                         return -EINVAL;
 672                 }
 673         }
 674
 675         if (data->numps < 2) {
 676                 printk(KERN_ERR PFX "no p states to transition\n");
 677                 return -ENODEV;
 678         }
 679
 680         if (check_pst_table(data, pst, maxvid))
 681                 return -EINVAL;
 682
 683         powernow_table = kmalloc((sizeof(struct cpufreq_frequency_table)
 684                 * (data->numps + 1)), GFP_KERNEL);
 685         if (!powernow_table) {
 686                 printk(KERN_ERR PFX "powernow_table memory alloc failure\n");
 687                 return -ENOMEM;
 688         }
 689
 690         for (j = 0; j < data->numps; j++) {
 691                 int freq;
 692                 powernow_table[j].index = pst[j].fid; /* lower 8 bits */
 693                 powernow_table[j].index |= (pst[j].vid << 8); /* upper 8 bits */
 694                 freq = find_khz_freq_from_fid(pst[j].fid);
 695                 powernow_table[j].frequency = freq;
 696         }
 697         powernow_table[data->numps].frequency = CPUFREQ_TABLE_END;
 698         powernow_table[data->numps].index = 0;
 699
 700         if (query_current_values_with_pending_wait(data)) {
 701                 kfree(powernow_table);
 702                 return -EIO;
 703         }
 704
 705         dprintk("cfid 0x%x, cvid 0x%x\n", data->currfid, data->currvid);
 706         data->powernow_table = powernow_table;
 707         if (cpumask_first(cpu_core_mask(data->cpu)) == data->cpu)
 708                 print_basics(data);
 709
 710         for (j = 0; j < data->numps; j++)
 711                 if ((pst[j].fid == data->currfid) &&
 712                     (pst[j].vid == data->currvid))
 713                         return 0;
 714
 715         dprintk("currfid/vid do not match PST, ignoring\n");
 716         return 0;
 717 }
 718
 719 /* Find and validate the PSB/PST table in BIOS. */
 720 static int find_psb_table(struct powernow_k8_data *data)
 721 {
 722         struct psb_s *psb;
 723         unsigned int i;
 724         u32 mvs;
 725         u8 maxvid;
 726         u32 cpst = 0;
 727         u32 thiscpuid;
 728
 729         for (i = 0xc0000; i < 0xffff0; i += 0x10) {
 730                 /* Scan BIOS looking for the signature. */
 731                 /* It can not be at ffff0 - it is too big. */
 732
 733                 psb = phys_to_virt(i);
 734                 if (memcmp(psb, PSB_ID_STRING, PSB_ID_STRING_LEN) != 0)
 735                         continue;
 736
 737                 dprintk("found PSB header at 0x%p\n", psb);
 738
 739                 dprintk("table vers: 0x%x\n", psb->tableversion);
 740                 if (psb->tableversion != PSB_VERSION_1_4) {
 741                         printk(KERN_ERR FW_BUG PFX "PSB table is not v1.4\n");
 742                         return -ENODEV;
 743                 }
 744
 745                 dprintk("flags: 0x%x\n", psb->flags1);
 746                 if (psb->flags1) {
 747                         printk(KERN_ERR FW_BUG PFX "unknown flags\n");
 748                         return -ENODEV;
 749                 }
 750
 751                 data->vstable = psb->vstable;
 752                 dprintk("voltage stabilization time: %d(*20us)\n",
 753                                 data->vstable);
 754
 755                 dprintk("flags2: 0x%x\n", psb->flags2);
 756                 data->rvo = psb->flags2 & 3;
 757                 data->irt = ((psb->flags2) >> 2) & 3;
 758                 mvs = ((psb->flags2) >> 4) & 3;
 759                 data->vidmvs = 1 << mvs;
 760                 data->batps = ((psb->flags2) >> 6) & 3;
 761
 762                 dprintk("ramp voltage offset: %d\n", data->rvo);
 763                 dprintk("isochronous relief time: %d\n", data->irt);
 764                 dprintk("maximum voltage step: %d - 0x%x\n", mvs, data->vidmvs);
 765
 766                 dprintk("numpst: 0x%x\n", psb->num_tables);
 767                 cpst = psb->num_tables;
 768                 if ((psb->cpuid == 0x00000fc0) ||
 769                     (psb->cpuid == 0x00000fe0)) {
 770                         thiscpuid = cpuid_eax(CPUID_PROCESSOR_SIGNATURE);
 771                         if ((thiscpuid == 0x00000fc0) ||
 772                             (thiscpuid == 0x00000fe0))
 773                                 cpst = 1;
 774                 }
 775                 if (cpst != 1) {
 776                         printk(KERN_ERR FW_BUG PFX "numpst must be 1\n");
 777                         return -ENODEV;
 778                 }
 779
 780                 data->plllock = psb->plllocktime;
 781                 dprintk("plllocktime: 0x%x (units 1us)\n", psb->plllocktime);
 782                 dprintk("maxfid: 0x%x\n", psb->maxfid);
 783                 dprintk("maxvid: 0x%x\n", psb->maxvid);
 784                 maxvid = psb->maxvid;
 785
 786                 data->numps = psb->numps;
 787                 dprintk("numpstates: 0x%x\n", data->numps);
 788                 return fill_powernow_table(data,
 789                                 (struct pst_s *)(psb+1), maxvid);
 790         }
 791         /*
 792          * If you see this message, complain to BIOS manufacturer. If
 793          * he tells you "we do not support Linux" or some similar
 794          * nonsense, remember that Windows 2000 uses the same legacy
 795          * mechanism that the old Linux PSB driver uses. Tell them it
 796          * is broken with Windows 2000.
 797          *
 798          * The reference to the AMD documentation is chapter 9 in the
 799          * BIOS and Kernel Developer's Guide, which is available on
 800          * www.amd.com
 801          */
 802         printk(KERN_ERR FW_BUG PFX "No PSB or ACPI _PSS objects\n");
 803         return -ENODEV;
 804 }
 805
 806 static void powernow_k8_acpi_pst_values(struct powernow_k8_data *data,
 807                 unsigned int index)
 808 {
 809         acpi_integer control;
 810
 811         if (!data->acpi_data.state_count || (cpu_family == CPU_HW_PSTATE))
 812                 return;
 813
 814         control = data->acpi_data.states[index].control;
 815         data->irt = (control >> IRT_SHIFT) & IRT_MASK;
 816         data->rvo = (control >> RVO_SHIFT) & RVO_MASK;
 817         data->exttype = (control >> EXT_TYPE_SHIFT) & EXT_TYPE_MASK;
 818         data->plllock = (control >> PLL_L_SHIFT) & PLL_L_MASK;
 819         data->vidmvs = 1 << ((control >> MVS_SHIFT) & MVS_MASK);
 820         data->vstable = (control >> VST_SHIFT) & VST_MASK;
 821 }
 822
 823 static int powernow_k8_cpu_init_acpi(struct powernow_k8_data *data)
 824 {
 825         struct cpufreq_frequency_table *powernow_table;
 826         int ret_val = -ENODEV;
 827         acpi_integer control, status;
 828
 829         if (acpi_processor_register_performance(&data->acpi_data, data->cpu)) {
 830                 dprintk("register performance failed: bad ACPI data\n");
 831                 return -EIO;
 832         }
 833
 834         /* verify the data contained in the ACPI structures */
 835         if (data->acpi_data.state_count <= 1) {
 836                 dprintk("No ACPI P-States\n");
 837                 goto err_out;
 838         }
 839
 840         control = data->acpi_data.control_register.space_id;
 841         status = data->acpi_data.status_register.space_id;
 842
 843         if ((control != ACPI_ADR_SPACE_FIXED_HARDWARE) ||
 844             (status != ACPI_ADR_SPACE_FIXED_HARDWARE)) {
 845                 dprintk("Invalid control/status registers (%x - %x)\n",
 846                         control, status);
 847                 goto err_out;
 848         }
 849
 850         /* fill in data->powernow_table */
 851         powernow_table = kmalloc((sizeof(struct cpufreq_frequency_table)
 852                 * (data->acpi_data.state_count + 1)), GFP_KERNEL);
 853         if (!powernow_table) {
 854                 dprintk("powernow_table memory alloc failure\n");
 855                 goto err_out;
 856         }
 857
 858         /* fill in data */
 859         data->numps = data->acpi_data.state_count;
 860         powernow_k8_acpi_pst_values(data, 0);
 861
 862         if (cpu_family == CPU_HW_PSTATE)
 863                 ret_val = fill_powernow_table_pstate(data, powernow_table);
 864         else
 865                 ret_val = fill_powernow_table_fidvid(data, powernow_table);
 866         if (ret_val)
 867                 goto err_out_mem;
 868
 869         powernow_table[data->acpi_data.state_count].frequency =
 870                 CPUFREQ_TABLE_END;
 871         powernow_table[data->acpi_data.state_count].index = 0;
 872         data->powernow_table = powernow_table;
 873
 874         if (cpumask_first(cpu_core_mask(data->cpu)) == data->cpu)
 875                 print_basics(data);
 876
 877         /* notify BIOS that we exist */
 878         acpi_processor_notify_smm(THIS_MODULE);
 879
 880         if (!zalloc_cpumask_var(&data->acpi_data.shared_cpu_map, GFP_KERNEL)) {
 881                 printk(KERN_ERR PFX
 882                                 "unable to alloc powernow_k8_data cpumask\n");
 883                 ret_val = -ENOMEM;
 884                 goto err_out_mem;
 885         }
 886
 887         return 0;
 888
 889 err_out_mem:
 890         kfree(powernow_table);
 891
 892 err_out:
 893         acpi_processor_unregister_performance(&data->acpi_data, data->cpu);
 894
 895         /* data->acpi_data.state_count informs us at ->exit()
 896          * whether ACPI was used */
 897         data->acpi_data.state_count = 0;
 898
 899         return ret_val;
 900 }
 901
 902 static int fill_powernow_table_pstate(struct powernow_k8_data *data,
 903                 struct cpufreq_frequency_table *powernow_table)
 904 {
 905         int i;
 906         u32 hi = 0, lo = 0;
 907         rdmsr(MSR_PSTATE_CUR_LIMIT, hi, lo);
 908         data->max_hw_pstate = (hi & HW_PSTATE_MAX_MASK) >> HW_PSTATE_MAX_SHIFT;
 909
 910         for (i = 0; i < data->acpi_data.state_count; i++) {
 911                 u32 index;
 912
 913                 index = data->acpi_data.states[i].control & HW_PSTATE_MASK;
 914                 if (index > data->max_hw_pstate) {
 915                         printk(KERN_ERR PFX "invalid pstate %d - "
 916                                         "bad value %d.\n", i, index);
 917                         printk(KERN_ERR PFX "Please report to BIOS "
 918                                         "manufacturer\n");
 919                         invalidate_entry(powernow_table, i);
 920                         continue;
 921                 }
 922                 rdmsr(MSR_PSTATE_DEF_BASE + index, lo, hi);
 923                 if (!(hi & HW_PSTATE_VALID_MASK)) {
 924                         dprintk("invalid pstate %d, ignoring\n", index);
 925                         invalidate_entry(powernow_table, i);
 926                         continue;
 927                 }
 928
 929                 powernow_table[i].index = index;
 930
 931                 /* Frequency may be rounded for these */
 932                 if (boot_cpu_data.x86 == 0x10 || boot_cpu_data.x86 == 0x11) {
 933                         powernow_table[i].frequency =
 934                                 freq_from_fid_did(lo & 0x3f, (lo >> 6) & 7);
 935                 } else
 936                         powernow_table[i].frequency =
 937                                 data->acpi_data.states[i].core_frequency * 1000;
 938         }
 939         return 0;
 940 }
 941
 942 static int fill_powernow_table_fidvid(struct powernow_k8_data *data,
 943                 struct cpufreq_frequency_table *powernow_table)
 944 {
 945         int i;
 946
 947         for (i = 0; i < data->acpi_data.state_count; i++) {
 948                 u32 fid;
 949                 u32 vid;
 950                 u32 freq, index;
 951                 acpi_integer status, control;
 952
 953                 if (data->exttype) {
 954                         status =  data->acpi_data.states[i].status;
 955                         fid = status & EXT_FID_MASK;
 956                         vid = (status >> VID_SHIFT) & EXT_VID_MASK;
 957                 } else {
 958                         control =  data->acpi_data.states[i].control;
 959                         fid = control & FID_MASK;
 960                         vid = (control >> VID_SHIFT) & VID_MASK;
 961                 }
 962
 963                 dprintk("   %d : fid 0x%x, vid 0x%x\n", i, fid, vid);
 964
 965                 index = fid | (vid<<8);
 966                 powernow_table[i].index = index;
 967
 968                 freq = find_khz_freq_from_fid(fid);
 969                 powernow_table[i].frequency = freq;
 970
 971                 /* verify frequency is OK */
 972                 if ((freq > (MAX_FREQ * 1000)) || (freq < (MIN_FREQ * 1000))) {
 973                         dprintk("invalid freq %u kHz, ignoring\n", freq);
 974                         invalidate_entry(powernow_table, i);
 975                         continue;
 976                 }
 977
 978                 /* verify voltage is OK -
 979                  * BIOSs are using "off" to indicate invalid */
 980                 if (vid == VID_OFF) {
 981                         dprintk("invalid vid %u, ignoring\n", vid);
 982                         invalidate_entry(powernow_table, i);
 983                         continue;
 984                 }
 985
 986                 if (freq != (data->acpi_data.states[i].core_frequency * 1000)) {
 987                         printk(KERN_INFO PFX "invalid freq entries "
 988                                 "%u kHz vs. %u kHz\n", freq,
 989                                 (unsigned int)
 990                                 (data->acpi_data.states[i].core_frequency
 991                                  * 1000));
 992                         invalidate_entry(powernow_table, i);
 993                         continue;
 994                 }
 995         }
 996         return 0;
 997 }
 998
 999 static void powernow_k8_cpu_exit_acpi(struct powernow_k8_data *data)
1000 {
1001         if (data->acpi_data.state_count)
1002                 acpi_processor_unregister_performance(&data->acpi_data,
1003                                 data->cpu);
1004         free_cpumask_var(data->acpi_data.shared_cpu_map);
1005 }
1006
1007 static int get_transition_latency(struct powernow_k8_data *data)
1008 {
1009         int max_latency = 0;
1010         int i;
1011         for (i = 0; i < data->acpi_data.state_count; i++) {
1012                 int cur_latency = data->acpi_data.states[i].transition_latency
1013                         + data->acpi_data.states[i].bus_master_latency;
1014                 if (cur_latency > max_latency)
1015                         max_latency = cur_latency;
1016         }
1017         if (max_latency == 0) {
1018                 /*
1019                  * Fam 11h always returns 0 as transition latency.
1020                  * This is intended and means "very fast". While cpufreq core
1021                  * and governors currently can handle that gracefully, better
1022                  * set it to 1 to avoid problems in the future.
1023                  * For all others it's a BIOS bug.
1024                  */
1025                 if (boot_cpu_data.x86 != 0x11)
1026                         printk(KERN_ERR FW_WARN PFX "Invalid zero transition "
1027                                 "latency\n");
1028                 max_latency = 1;
1029         }
1030         /* value in usecs, needs to be in nanoseconds */
1031         return 1000 * max_latency;
1032 }
1033
1034 /* Take a frequency, and issue the fid/vid transition command */
1035 static int transition_frequency_fidvid(struct powernow_k8_data *data,
1036                 unsigned int index)
1037 {
1038         u32 fid = 0;
1039         u32 vid = 0;
1040         int res, i;
1041         struct cpufreq_freqs freqs;
1042
1043         dprintk("cpu %d transition to index %u\n", smp_processor_id(), index);
1044
1045         /* fid/vid correctness check for k8 */
1046         /* fid are the lower 8 bits of the index we stored into
1047          * the cpufreq frequency table in find_psb_table, vid
1048          * are the upper 8 bits.
1049          */
1050         fid = data->powernow_table[index].index & 0xFF;
1051         vid = (data->powernow_table[index].index & 0xFF00) >> 8;
1052
1053         dprintk("table matched fid 0x%x, giving vid 0x%x\n", fid, vid);
1054
1055         if (query_current_values_with_pending_wait(data))
1056                 return 1;
1057
1058         if ((data->currvid == vid) && (data->currfid == fid)) {
1059                 dprintk("target matches current values (fid 0x%x, vid 0x%x)\n",
1060                         fid, vid);
1061                 return 0;
1062         }
1063
1064         dprintk("cpu %d, changing to fid 0x%x, vid 0x%x\n",
1065                 smp_processor_id(), fid, vid);
1066         freqs.old = find_khz_freq_from_fid(data->currfid);
1067         freqs.new = find_khz_freq_from_fid(fid);
1068
1069         for_each_cpu(i, data->available_cores) {
1070                 freqs.cpu = i;
1071                 cpufreq_notify_transition(&freqs, CPUFREQ_PRECHANGE);
1072         }
1073
1074         res = transition_fid_vid(data, fid, vid);
1075         freqs.new = find_khz_freq_from_fid(data->currfid);
1076
1077         for_each_cpu(i, data->available_cores) {
1078                 freqs.cpu = i;
1079                 cpufreq_notify_transition(&freqs, CPUFREQ_POSTCHANGE);
1080         }
1081         return res;
1082 }
1083
1084 /* Take a frequency, and issue the hardware pstate transition command */
1085 static int transition_frequency_pstate(struct powernow_k8_data *data,
1086                 unsigned int index)
1087 {
1088         u32 pstate = 0;
1089         int res, i;
1090         struct cpufreq_freqs freqs;
1091
1092         dprintk("cpu %d transition to index %u\n", smp_processor_id(), index);
1093
1094         /* get MSR index for hardware pstate transition */
1095         pstate = index & HW_PSTATE_MASK;
1096         if (pstate > data->max_hw_pstate)
1097                 return 0;
1098         freqs.old = find_khz_freq_from_pstate(data->powernow_table,
1099                         data->currpstate);
1100         freqs.new = find_khz_freq_from_pstate(data->powernow_table, pstate);
1101
1102         for_each_cpu(i, data->available_cores) {
1103                 freqs.cpu = i;
1104                 cpufreq_notify_transition(&freqs, CPUFREQ_PRECHANGE);
1105         }
1106
1107         res = transition_pstate(data, pstate);
1108         freqs.new = find_khz_freq_from_pstate(data->powernow_table, pstate);
1109
1110         for_each_cpu(i, data->available_cores) {
1111                 freqs.cpu = i;
1112                 cpufreq_notify_transition(&freqs, CPUFREQ_POSTCHANGE);
1113         }
1114         return res;
1115 }
1116
1117 /* Driver entry point to switch to the target frequency */
1118 static int powernowk8_target(struct cpufreq_policy *pol,
1119                 unsigned targfreq, unsigned relation)
1120 {
1121         cpumask_var_t oldmask;
1122         struct powernow_k8_data *data = per_cpu(powernow_data, pol->cpu);
1123         u32 checkfid;
1124         u32 checkvid;
1125         unsigned int newstate;
1126         int ret = -EIO;
1127
1128         if (!data)
1129                 return -EINVAL;
1130
1131         checkfid = data->currfid;
1132         checkvid = data->currvid;
1133
1134         /* only run on specific CPU from here on. */
1135         /* This is poor form: use a workqueue or smp_call_function_single */
1136         if (!alloc_cpumask_var(&oldmask, GFP_KERNEL))
1137                 return -ENOMEM;
1138
1139         cpumask_copy(oldmask, tsk_cpus_allowed(current));
1140         set_cpus_allowed_ptr(current, cpumask_of(pol->cpu));
1141
1142         if (smp_processor_id() != pol->cpu) {
1143                 printk(KERN_ERR PFX "limiting to cpu %u failed\n", pol->cpu);
1144                 goto err_out;
1145         }
1146
1147         if (pending_bit_stuck()) {
1148                 printk(KERN_ERR PFX "failing targ, change pending bit set\n");
1149                 goto err_out;
1150         }
1151
1152         dprintk("targ: cpu %d, %d kHz, min %d, max %d, relation %d\n",
1153                 pol->cpu, targfreq, pol->min, pol->max, relation);
1154
1155         if (query_current_values_with_pending_wait(data))
1156                 goto err_out;
1157
1158         if (cpu_family != CPU_HW_PSTATE) {
1159                 dprintk("targ: curr fid 0x%x, vid 0x%x\n",
1160                 data->currfid, data->currvid);
1161
1162                 if ((checkvid != data->currvid) ||
1163                     (checkfid != data->currfid)) {
1164                         printk(KERN_INFO PFX
1165                                 "error - out of sync, fix 0x%x 0x%x, "
1166                                 "vid 0x%x 0x%x\n",
1167                                 checkfid, data->currfid,
1168                                 checkvid, data->currvid);
1169                 }
1170         }
1171
1172         if (cpufreq_frequency_table_target(pol, data->powernow_table,
1173                                 targfreq, relation, &newstate))
1174                 goto err_out;
1175
1176         mutex_lock(&fidvid_mutex);
1177
1178         powernow_k8_acpi_pst_values(data, newstate);
1179
1180         if (cpu_family == CPU_HW_PSTATE)
1181                 ret = transition_frequency_pstate(data, newstate);
1182         else
1183                 ret = transition_frequency_fidvid(data, newstate);
1184         if (ret) {
1185                 printk(KERN_ERR PFX "transition frequency failed\n");
1186                 ret = 1;
1187                 mutex_unlock(&fidvid_mutex);
1188                 goto err_out;
1189         }
1190         mutex_unlock(&fidvid_mutex);
1191
1192         if (cpu_family == CPU_HW_PSTATE)
1193                 pol->cur = find_khz_freq_from_pstate(data->powernow_table,
1194                                 newstate);
1195         else
1196                 pol->cur = find_khz_freq_from_fid(data->currfid);
1197         ret = 0;
1198
1199 err_out:
1200         set_cpus_allowed_ptr(current, oldmask);
1201         free_cpumask_var(oldmask);
1202         return ret;
1203 }
1204
1205 /* Driver entry point to verify the policy and range of frequencies */
1206 static int powernowk8_verify(struct cpufreq_policy *pol)
1207 {
1208         struct powernow_k8_data *data = per_cpu(powernow_data, pol->cpu);
1209
1210         if (!data)
1211                 return -EINVAL;
1212
1213         return cpufreq_frequency_table_verify(pol, data->powernow_table);
1214 }
1215
1216 struct init_on_cpu {
1217         struct powernow_k8_data *data;
1218         int rc;
1219 };
1220
1221 static void __cpuinit powernowk8_cpu_init_on_cpu(void *_init_on_cpu)
1222 {
1223         struct init_on_cpu *init_on_cpu = _init_on_cpu;
1224
1225         if (pending_bit_stuck()) {
1226                 printk(KERN_ERR PFX "failing init, change pending bit set\n");
1227                 init_on_cpu->rc = -ENODEV;
1228                 return;
1229         }
1230
1231         if (query_current_values_with_pending_wait(init_on_cpu->data)) {
1232                 init_on_cpu->rc = -ENODEV;
1233                 return;
1234         }
1235
1236         if (cpu_family == CPU_OPTERON)
1237                 fidvid_msr_init();
1238
1239         init_on_cpu->rc = 0;
1240 }
1241
1242 /* per CPU init entry point to the driver */
1243 static int __cpuinit powernowk8_cpu_init(struct cpufreq_policy *pol)
1244 {
1245         static const char ACPI_PSS_BIOS_BUG_MSG[] =
1246                 KERN_ERR FW_BUG PFX "No compatible ACPI _PSS objects found.\n"
1247                 FW_BUG PFX "Try again with latest BIOS.\n";
1248         struct powernow_k8_data *data;
1249         struct init_on_cpu init_on_cpu;
1250         int rc;
1251
1252         if (!cpu_online(pol->cpu))
1253                 return -ENODEV;
1254
1255         smp_call_function_single(pol->cpu, check_supported_cpu, &rc, 1);
1256         if (rc)
1257                 return -ENODEV;
1258
1259         data = kzalloc(sizeof(struct powernow_k8_data), GFP_KERNEL);
1260         if (!data) {
1261                 printk(KERN_ERR PFX "unable to alloc powernow_k8_data");
1262                 return -ENOMEM;
1263         }
1264
1265         data->cpu = pol->cpu;
1266         data->currpstate = HW_PSTATE_INVALID;
1267
1268         if (powernow_k8_cpu_init_acpi(data)) {
1269                 /*
1270                  * Use the PSB BIOS structure. This is only availabe on
1271                  * an UP version, and is deprecated by AMD.
1272                  */
1273                 if (num_online_cpus() != 1) {
1274                         printk_once(ACPI_PSS_BIOS_BUG_MSG);
1275                         goto err_out;
1276                 }
1277                 if (pol->cpu != 0) {
1278                         printk(KERN_ERR FW_BUG PFX "No ACPI _PSS objects for "
1279                                "CPU other than CPU0. Complain to your BIOS "
1280                                "vendor.\n");
1281                         goto err_out;
1282                 }
1283                 rc = find_psb_table(data);
1284                 if (rc)
1285                         goto err_out;
1286
1287                 /* Take a crude guess here.
1288                  * That guess was in microseconds, so multiply with 1000 */
1289                 pol->cpuinfo.transition_latency = (
1290                          ((data->rvo + 8) * data->vstable * VST_UNITS_20US) +
1291                          ((1 << data->irt) * 30)) * 1000;
1292         } else /* ACPI _PSS objects available */
1293                 pol->cpuinfo.transition_latency = get_transition_latency(data);
1294
1295         /* only run on specific CPU from here on */
1296         init_on_cpu.data = data;
1297         smp_call_function_single(data->cpu, powernowk8_cpu_init_on_cpu,
1298                                  &init_on_cpu, 1);
1299         rc = init_on_cpu.rc;
1300         if (rc != 0)
1301                 goto err_out_exit_acpi;
1302
1303         if (cpu_family == CPU_HW_PSTATE)
1304                 cpumask_copy(pol->cpus, cpumask_of(pol->cpu));
1305         else
1306                 cpumask_copy(pol->cpus, cpu_core_mask(pol->cpu));
1307         data->available_cores = pol->cpus;
1308
1309         if (cpu_family == CPU_HW_PSTATE)
1310                 pol->cur = find_khz_freq_from_pstate(data->powernow_table,
1311                                 data->currpstate);
1312         else
1313                 pol->cur = find_khz_freq_from_fid(data->currfid);
1314         dprintk("policy current frequency %d kHz\n", pol->cur);
1315
1316         /* min/max the cpu is capable of */
1317         if (cpufreq_frequency_table_cpuinfo(pol, data->powernow_table)) {
1318                 printk(KERN_ERR FW_BUG PFX "invalid powernow_table\n");
1319                 powernow_k8_cpu_exit_acpi(data);
1320                 kfree(data->powernow_table);
1321                 kfree(data);
1322                 return -EINVAL;
1323         }
1324
1325         cpufreq_frequency_table_get_attr(data->powernow_table, pol->cpu);
1326
1327         if (cpu_family == CPU_HW_PSTATE)
1328                 dprintk("cpu_init done, current pstate 0x%x\n",
1329                                 data->currpstate);
1330         else
1331                 dprintk("cpu_init done, current fid 0x%x, vid 0x%x\n",
1332                         data->currfid, data->currvid);
1333
1334         per_cpu(powernow_data, pol->cpu) = data;
1335
1336         return 0;
1337
1338 err_out_exit_acpi:
1339         powernow_k8_cpu_exit_acpi(data);
1340
1341 err_out:
1342         kfree(data);
1343         return -ENODEV;
1344 }
1345
1346 static int __devexit powernowk8_cpu_exit(struct cpufreq_policy *pol)
1347 {
1348         struct powernow_k8_data *data = per_cpu(powernow_data, pol->cpu);
1349
1350         if (!data)
1351                 return -EINVAL;
1352
1353         powernow_k8_cpu_exit_acpi(data);
1354
1355         cpufreq_frequency_table_put_attr(pol->cpu);
1356
1357         kfree(data->powernow_table);
1358         kfree(data);
1359         per_cpu(powernow_data, pol->cpu) = NULL;
1360
1361         return 0;
1362 }
1363
1364 static void query_values_on_cpu(void *_err)
1365 {
1366         int *err = _err;
1367         struct powernow_k8_data *data = __get_cpu_var(powernow_data);
1368
1369         *err = query_current_values_with_pending_wait(data);
1370 }
1371
1372 static unsigned int powernowk8_get(unsigned int cpu)
1373 {
1374         struct powernow_k8_data *data = per_cpu(powernow_data, cpu);
1375         unsigned int khz = 0;
1376         int err;
1377
1378         if (!data)
1379                 return 0;
1380
1381         smp_call_function_single(cpu, query_values_on_cpu, &err, true);
1382         if (err)
1383                 goto out;
1384
1385         if (cpu_family == CPU_HW_PSTATE)
1386                 khz = find_khz_freq_from_pstate(data->powernow_table,
1387                                                 data->currpstate);
1388         else
1389                 khz = find_khz_freq_from_fid(data->currfid);
1390
1391
1392 out:
1393         return khz;
1394 }
1395
1396 static struct freq_attr *powernow_k8_attr[] = {
1397         &cpufreq_freq_attr_scaling_available_freqs,
1398         NULL,
1399 };
1400
1401 static struct cpufreq_driver cpufreq_amd64_driver = {
1402         .verify         = powernowk8_verify,
1403         .target         = powernowk8_target,
1404         .bios_limit     = acpi_processor_get_bios_limit,
1405         .init           = powernowk8_cpu_init,
1406         .exit           = __devexit_p(powernowk8_cpu_exit),
1407         .get            = powernowk8_get,
1408         .name           = "powernow-k8",
1409         .owner          = THIS_MODULE,
1410         .attr           = powernow_k8_attr,
1411 };
1412
1413 /* driver entry point for init */
1414 static int __cpuinit powernowk8_init(void)
1415 {
1416         unsigned int i, supported_cpus = 0;
1417
1418         for_each_online_cpu(i) {
1419                 int rc;
1420                 smp_call_function_single(i, check_supported_cpu, &rc, 1);
1421                 if (rc == 0)
1422                         supported_cpus++;
1423         }
1424
1425         if (supported_cpus == num_online_cpus()) {
1426                 printk(KERN_INFO PFX "Found %d %s "
1427                         "processors (%d cpu cores) (" VERSION ")\n",
1428                         num_online_nodes(),
1429                         boot_cpu_data.x86_model_id, supported_cpus);
1430                 return cpufreq_register_driver(&cpufreq_amd64_driver);
1431         }
1432
1433         return -ENODEV;
1434 }
1435
1436 /* driver entry point for term */
1437 static void __exit powernowk8_exit(void)
1438 {
1439         dprintk("exit\n");
1440
1441         cpufreq_unregister_driver(&cpufreq_amd64_driver);
1442 }
1443
1444 MODULE_AUTHOR("Paul Devriendt <paul.devriendt@amd.com> and "
1445                 "Mark Langsdorf <mark.langsdorf@amd.com>");
1446 MODULE_DESCRIPTION("AMD Athlon 64 and Opteron processor frequency driver.");
1447 MODULE_LICENSE("GPL");
1448
1449 late_initcall(powernowk8_init);
1450 module_exit(powernowk8_exit);