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

   1 /*
   2  *   (c) 2003-2006 Advanced Micro Devices, Inc.
   3  *  Your use of this code is subject to the terms and conditions of the
   4  *  GNU general public license version 2. See "COPYING" or
   5  *  http://www.gnu.org/licenses/gpl.html
   6  *
   7  *  Support : mark.langsdorf@amd.com
   8  *
   9  *  Based on the powernow-k7.c module written by Dave Jones.
  10  *  (C) 2003 Dave Jones <davej@codemonkey.org.uk> on behalf of SuSE Labs
  11  *  (C) 2004 Dominik Brodowski <linux@brodo.de>
  12  *  (C) 2004 Pavel Machek <pavel@suse.cz>
  13  *  Licensed under the terms of the GNU GPL License version 2.
  14  *  Based upon datasheets & sample CPUs kindly provided by AMD.
  15  *
  16  *  Valuable input gratefully received from Dave Jones, Pavel Machek,
  17  *  Dominik Brodowski, Jacob Shin, and others.
  18  *  Originally developed by Paul Devriendt.
  19  *  Processor information obtained from Chapter 9 (Power and Thermal Management)
  20  *  of the "BIOS and Kernel Developer's Guide for the AMD Athlon 64 and AMD
  21  *  Opteron Processors" available for download from www.amd.com
  22  *
  23  *  Tables for specific CPUs can be inferred from
  24  *     http://www.amd.com/us-en/assets/content_type/white_papers_and_tech_docs/30430.pdf
  25  */
  26
  27 #include <linux/kernel.h>
  28 #include <linux/smp.h>
  29 #include <linux/module.h>
  30 #include <linux/init.h>
  31 #include <linux/cpufreq.h>
  32 #include <linux/slab.h>
  33 #include <linux/string.h>
  34 #include <linux/cpumask.h>
  35 #include <linux/sched.h>        /* for current / set_cpus_allowed() */
  36
  37 #include <asm/msr.h>
  38 #include <asm/io.h>
  39 #include <asm/delay.h>
  40
  41 #ifdef CONFIG_X86_POWERNOW_K8_ACPI
  42 #include <linux/acpi.h>
  43 #include <linux/mutex.h>
  44 #include <acpi/processor.h>
  45 #endif
  46
  47 #define PFX "powernow-k8: "
  48 #define BFX PFX "BIOS error: "
  49 #define VERSION "version 2.20.00"
  50 #include "powernow-k8.h"
  51
  52 /* serialize freq changes  */
  53 static DEFINE_MUTEX(fidvid_mutex);
  54
  55 static DEFINE_PER_CPU(struct powernow_k8_data *, powernow_data);
  56
  57 static int cpu_family = CPU_OPTERON;
  58
  59 #ifndef CONFIG_SMP
  60 DEFINE_PER_CPU(cpumask_t, cpu_core_map);
  61 #endif
  62
  63 /* Return a frequency in MHz, given an input fid */
  64 static u32 find_freq_from_fid(u32 fid)
  65 {
  66         return 800 + (fid * 100);
  67 }
  68
  69 /* Return a frequency in KHz, given an input fid */
  70 static u32 find_khz_freq_from_fid(u32 fid)
  71 {
  72         return 1000 * find_freq_from_fid(fid);
  73 }
  74
  75 static u32 find_khz_freq_from_pstate(struct cpufreq_frequency_table *data, u32 pstate)
  76 {
  77         return data[pstate].frequency;
  78 }
  79
  80 /* Return the vco fid for an input fid
  81  *
  82  * Each "low" fid has corresponding "high" fid, and you can get to "low" fids
  83  * only from corresponding high fids. This returns "high" fid corresponding to
  84  * "low" one.
  85  */
  86 static u32 convert_fid_to_vco_fid(u32 fid)
  87 {
  88         if (fid < HI_FID_TABLE_BOTTOM)
  89                 return 8 + (2 * fid);
  90         else
  91                 return fid;
  92 }
  93
  94 /*
  95  * Return 1 if the pending bit is set. Unless we just instructed the processor
  96  * to transition to a new state, seeing this bit set is really bad news.
  97  */
  98 static int pending_bit_stuck(void)
  99 {
 100         u32 lo, hi;
 101
 102         if (cpu_family == CPU_HW_PSTATE)
 103                 return 0;
 104
 105         rdmsr(MSR_FIDVID_STATUS, lo, hi);
 106         return lo & MSR_S_LO_CHANGE_PENDING ? 1 : 0;
 107 }
 108
 109 /*
 110  * Update the global current fid / vid values from the status msr.
 111  * Returns 1 on error.
 112  */
 113 static int query_current_values_with_pending_wait(struct powernow_k8_data *data)
 114 {
 115         u32 lo, hi;
 116         u32 i = 0;
 117
 118         if (cpu_family == CPU_HW_PSTATE) {
 119                 rdmsr(MSR_PSTATE_STATUS, lo, hi);
 120                 i = lo & HW_PSTATE_MASK;
 121                 data->currpstate = i;
 122                 return 0;
 123         }
 124         do {
 125                 if (i++ > 10000) {
 126                         dprintk("detected change pending stuck\n");
 127                         return 1;
 128                 }
 129                 rdmsr(MSR_FIDVID_STATUS, lo, hi);
 130         } while (lo & MSR_S_LO_CHANGE_PENDING);
 131
 132         data->currvid = hi & MSR_S_HI_CURRENT_VID;
 133         data->currfid = lo & MSR_S_LO_CURRENT_FID;
 134
 135         return 0;
 136 }
 137
 138 /* the isochronous relief time */
 139 static void count_off_irt(struct powernow_k8_data *data)
 140 {
 141         udelay((1 << data->irt) * 10);
 142         return;
 143 }
 144
 145 /* the voltage stabilization time */
 146 static void count_off_vst(struct powernow_k8_data *data)
 147 {
 148         udelay(data->vstable * VST_UNITS_20US);
 149         return;
 150 }
 151
 152 /* need to init the control msr to a safe value (for each cpu) */
 153 static void fidvid_msr_init(void)
 154 {
 155         u32 lo, hi;
 156         u8 fid, vid;
 157
 158         rdmsr(MSR_FIDVID_STATUS, lo, hi);
 159         vid = hi & MSR_S_HI_CURRENT_VID;
 160         fid = lo & MSR_S_LO_CURRENT_FID;
 161         lo = fid | (vid << MSR_C_LO_VID_SHIFT);
 162         hi = MSR_C_HI_STP_GNT_BENIGN;
 163         dprintk("cpu%d, init lo 0x%x, hi 0x%x\n", smp_processor_id(), lo, hi);
 164         wrmsr(MSR_FIDVID_CTL, lo, hi);
 165 }
 166
 167 /* write the new fid value along with the other control fields to the msr */
 168 static int write_new_fid(struct powernow_k8_data *data, u32 fid)
 169 {
 170         u32 lo;
 171         u32 savevid = data->currvid;
 172         u32 i = 0;
 173
 174         if ((fid & INVALID_FID_MASK) || (data->currvid & INVALID_VID_MASK)) {
 175                 printk(KERN_ERR PFX "internal error - overflow on fid write\n");
 176                 return 1;
 177         }
 178
 179         lo = fid | (data->currvid << MSR_C_LO_VID_SHIFT) | MSR_C_LO_INIT_FID_VID;
 180
 181         dprintk("writing fid 0x%x, lo 0x%x, hi 0x%x\n",
 182                 fid, lo, data->plllock * PLL_LOCK_CONVERSION);
 183
 184         do {
 185                 wrmsr(MSR_FIDVID_CTL, lo, data->plllock * PLL_LOCK_CONVERSION);
 186                 if (i++ > 100) {
 187                         printk(KERN_ERR PFX "Hardware error - pending bit very stuck - no further pstate changes possible\n");
 188                         return 1;
 189                 }
 190         } while (query_current_values_with_pending_wait(data));
 191
 192         count_off_irt(data);
 193
 194         if (savevid != data->currvid) {
 195                 printk(KERN_ERR PFX "vid change on fid trans, old 0x%x, new 0x%x\n",
 196                        savevid, data->currvid);
 197                 return 1;
 198         }
 199
 200         if (fid != data->currfid) {
 201                 printk(KERN_ERR PFX "fid trans failed, fid 0x%x, curr 0x%x\n", fid,
 202                         data->currfid);
 203                 return 1;
 204         }
 205
 206         return 0;
 207 }
 208
 209 /* Write a new vid to the hardware */
 210 static int write_new_vid(struct powernow_k8_data *data, u32 vid)
 211 {
 212         u32 lo;
 213         u32 savefid = data->currfid;
 214         int i = 0;
 215
 216         if ((data->currfid & INVALID_FID_MASK) || (vid & INVALID_VID_MASK)) {
 217                 printk(KERN_ERR PFX "internal error - overflow on vid write\n");
 218                 return 1;
 219         }
 220
 221         lo = data->currfid | (vid << MSR_C_LO_VID_SHIFT) | MSR_C_LO_INIT_FID_VID;
 222
 223         dprintk("writing vid 0x%x, lo 0x%x, hi 0x%x\n",
 224                 vid, lo, STOP_GRANT_5NS);
 225
 226         do {
 227                 wrmsr(MSR_FIDVID_CTL, lo, STOP_GRANT_5NS);
 228                 if (i++ > 100) {
 229                         printk(KERN_ERR PFX "internal error - pending bit very stuck - no further pstate changes possible\n");
 230                         return 1;
 231                 }
 232         } while (query_current_values_with_pending_wait(data));
 233
 234         if (savefid != data->currfid) {
 235                 printk(KERN_ERR PFX "fid changed on vid trans, old 0x%x new 0x%x\n",
 236                        savefid, data->currfid);
 237                 return 1;
 238         }
 239
 240         if (vid != data->currvid) {
 241                 printk(KERN_ERR PFX "vid trans failed, vid 0x%x, curr 0x%x\n", vid,
 242                                 data->currvid);
 243                 return 1;
 244         }
 245
 246         return 0;
 247 }
 248
 249 /*
 250  * Reduce the vid by the max of step or reqvid.
 251  * Decreasing vid codes represent increasing voltages:
 252  * vid of 0 is 1.550V, vid of 0x1e is 0.800V, vid of VID_OFF is off.
 253  */
 254 static int decrease_vid_code_by_step(struct powernow_k8_data *data, u32 reqvid, u32 step)
 255 {
 256         if ((data->currvid - reqvid) > step)
 257                 reqvid = data->currvid - step;
 258
 259         if (write_new_vid(data, reqvid))
 260                 return 1;
 261
 262         count_off_vst(data);
 263
 264         return 0;
 265 }
 266
 267 /* Change hardware pstate by single MSR write */
 268 static int transition_pstate(struct powernow_k8_data *data, u32 pstate)
 269 {
 270         wrmsr(MSR_PSTATE_CTRL, pstate, 0);
 271         data->currpstate = pstate;
 272         return 0;
 273 }
 274
 275 /* Change Opteron/Athlon64 fid and vid, by the 3 phases. */
 276 static int transition_fid_vid(struct powernow_k8_data *data, u32 reqfid, u32 reqvid)
 277 {
 278         if (core_voltage_pre_transition(data, reqvid))
 279                 return 1;
 280
 281         if (core_frequency_transition(data, reqfid))
 282                 return 1;
 283
 284         if (core_voltage_post_transition(data, reqvid))
 285                 return 1;
 286
 287         if (query_current_values_with_pending_wait(data))
 288                 return 1;
 289
 290         if ((reqfid != data->currfid) || (reqvid != data->currvid)) {
 291                 printk(KERN_ERR PFX "failed (cpu%d): req 0x%x 0x%x, curr 0x%x 0x%x\n",
 292                                 smp_processor_id(),
 293                                 reqfid, reqvid, data->currfid, data->currvid);
 294                 return 1;
 295         }
 296
 297         dprintk("transitioned (cpu%d): new fid 0x%x, vid 0x%x\n",
 298                 smp_processor_id(), data->currfid, data->currvid);
 299
 300         return 0;
 301 }
 302
 303 /* Phase 1 - core voltage transition ... setup voltage */
 304 static int core_voltage_pre_transition(struct powernow_k8_data *data, u32 reqvid)
 305 {
 306         u32 rvosteps = data->rvo;
 307         u32 savefid = data->currfid;
 308         u32 maxvid, lo;
 309
 310         dprintk("ph1 (cpu%d): start, currfid 0x%x, currvid 0x%x, reqvid 0x%x, rvo 0x%x\n",
 311                 smp_processor_id(),
 312                 data->currfid, data->currvid, reqvid, data->rvo);
 313
 314         rdmsr(MSR_FIDVID_STATUS, lo, maxvid);
 315         maxvid = 0x1f & (maxvid >> 16);
 316         dprintk("ph1 maxvid=0x%x\n", maxvid);
 317         if (reqvid < maxvid) /* lower numbers are higher voltages */
 318                 reqvid = maxvid;
 319
 320         while (data->currvid > reqvid) {
 321                 dprintk("ph1: curr 0x%x, req vid 0x%x\n",
 322                         data->currvid, reqvid);
 323                 if (decrease_vid_code_by_step(data, reqvid, data->vidmvs))
 324                         return 1;
 325         }
 326
 327         while ((rvosteps > 0) && ((data->rvo + data->currvid) > reqvid)) {
 328                 if (data->currvid == maxvid) {
 329                         rvosteps = 0;
 330                 } else {
 331                         dprintk("ph1: changing vid for rvo, req 0x%x\n",
 332                                 data->currvid - 1);
 333                         if (decrease_vid_code_by_step(data, data->currvid - 1, 1))
 334                                 return 1;
 335                         rvosteps--;
 336                 }
 337         }
 338
 339         if (query_current_values_with_pending_wait(data))
 340                 return 1;
 341
 342         if (savefid != data->currfid) {
 343                 printk(KERN_ERR PFX "ph1 err, currfid changed 0x%x\n", data->currfid);
 344                 return 1;
 345         }
 346
 347         dprintk("ph1 complete, currfid 0x%x, currvid 0x%x\n",
 348                 data->currfid, data->currvid);
 349
 350         return 0;
 351 }
 352
 353 /* Phase 2 - core frequency transition */
 354 static int core_frequency_transition(struct powernow_k8_data *data, u32 reqfid)
 355 {
 356         u32 vcoreqfid, vcocurrfid, vcofiddiff, fid_interval, savevid = data->currvid;
 357
 358         if ((reqfid < HI_FID_TABLE_BOTTOM) && (data->currfid < HI_FID_TABLE_BOTTOM)) {
 359                 printk(KERN_ERR PFX "ph2: illegal lo-lo transition 0x%x 0x%x\n",
 360                         reqfid, data->currfid);
 361                 return 1;
 362         }
 363
 364         if (data->currfid == reqfid) {
 365                 printk(KERN_ERR PFX "ph2 null fid transition 0x%x\n", data->currfid);
 366                 return 0;
 367         }
 368
 369         dprintk("ph2 (cpu%d): starting, currfid 0x%x, currvid 0x%x, reqfid 0x%x\n",
 370                 smp_processor_id(),
 371                 data->currfid, data->currvid, reqfid);
 372
 373         vcoreqfid = convert_fid_to_vco_fid(reqfid);
 374         vcocurrfid = convert_fid_to_vco_fid(data->currfid);
 375         vcofiddiff = vcocurrfid > vcoreqfid ? vcocurrfid - vcoreqfid
 376             : vcoreqfid - vcocurrfid;
 377
 378         while (vcofiddiff > 2) {
 379                 (data->currfid & 1) ? (fid_interval = 1) : (fid_interval = 2);
 380
 381                 if (reqfid > data->currfid) {
 382                         if (data->currfid > LO_FID_TABLE_TOP) {
 383                                 if (write_new_fid(data, data->currfid + fid_interval)) {
 384                                         return 1;
 385                                 }
 386                         } else {
 387                                 if (write_new_fid
 388                                     (data, 2 + convert_fid_to_vco_fid(data->currfid))) {
 389                                         return 1;
 390                                 }
 391                         }
 392                 } else {
 393                         if (write_new_fid(data, data->currfid - fid_interval))
 394                                 return 1;
 395                 }
 396
 397                 vcocurrfid = convert_fid_to_vco_fid(data->currfid);
 398                 vcofiddiff = vcocurrfid > vcoreqfid ? vcocurrfid - vcoreqfid
 399                     : vcoreqfid - vcocurrfid;
 400         }
 401
 402         if (write_new_fid(data, reqfid))
 403                 return 1;
 404
 405         if (query_current_values_with_pending_wait(data))
 406                 return 1;
 407
 408         if (data->currfid != reqfid) {
 409                 printk(KERN_ERR PFX
 410                         "ph2: mismatch, failed fid transition, curr 0x%x, req 0x%x\n",
 411                         data->currfid, reqfid);
 412                 return 1;
 413         }
 414
 415         if (savevid != data->currvid) {
 416                 printk(KERN_ERR PFX "ph2: vid changed, save 0x%x, curr 0x%x\n",
 417                         savevid, data->currvid);
 418                 return 1;
 419         }
 420
 421         dprintk("ph2 complete, currfid 0x%x, currvid 0x%x\n",
 422                 data->currfid, data->currvid);
 423
 424         return 0;
 425 }
 426
 427 /* Phase 3 - core voltage transition flow ... jump to the final vid. */
 428 static int core_voltage_post_transition(struct powernow_k8_data *data, u32 reqvid)
 429 {
 430         u32 savefid = data->currfid;
 431         u32 savereqvid = reqvid;
 432
 433         dprintk("ph3 (cpu%d): starting, currfid 0x%x, currvid 0x%x\n",
 434                 smp_processor_id(),
 435                 data->currfid, data->currvid);
 436
 437         if (reqvid != data->currvid) {
 438                 if (write_new_vid(data, reqvid))
 439                         return 1;
 440
 441                 if (savefid != data->currfid) {
 442                         printk(KERN_ERR PFX
 443                                "ph3: bad fid change, save 0x%x, curr 0x%x\n",
 444                                savefid, data->currfid);
 445                         return 1;
 446                 }
 447
 448                 if (data->currvid != reqvid) {
 449                         printk(KERN_ERR PFX
 450                                "ph3: failed vid transition\n, req 0x%x, curr 0x%x",
 451                                reqvid, data->currvid);
 452                         return 1;
 453                 }
 454         }
 455
 456         if (query_current_values_with_pending_wait(data))
 457                 return 1;
 458
 459         if (savereqvid != data->currvid) {
 460                 dprintk("ph3 failed, currvid 0x%x\n", data->currvid);
 461                 return 1;
 462         }
 463
 464         if (savefid != data->currfid) {
 465                 dprintk("ph3 failed, currfid changed 0x%x\n",
 466                         data->currfid);
 467                 return 1;
 468         }
 469
 470         dprintk("ph3 complete, currfid 0x%x, currvid 0x%x\n",
 471                 data->currfid, data->currvid);
 472
 473         return 0;
 474 }
 475
 476 static int check_supported_cpu(unsigned int cpu)
 477 {
 478         cpumask_t oldmask;
 479         u32 eax, ebx, ecx, edx;
 480         unsigned int rc = 0;
 481
 482         oldmask = current->cpus_allowed;
 483         set_cpus_allowed_ptr(current, &cpumask_of_cpu(cpu));
 484
 485         if (smp_processor_id() != cpu) {
 486                 printk(KERN_ERR PFX "limiting to cpu %u failed\n", cpu);
 487                 goto out;
 488         }
 489
 490         if (current_cpu_data.x86_vendor != X86_VENDOR_AMD)
 491                 goto out;
 492
 493         eax = cpuid_eax(CPUID_PROCESSOR_SIGNATURE);
 494         if (((eax & CPUID_XFAM) != CPUID_XFAM_K8) &&
 495             ((eax & CPUID_XFAM) < CPUID_XFAM_10H))
 496                 goto out;
 497
 498         if ((eax & CPUID_XFAM) == CPUID_XFAM_K8) {
 499                 if (((eax & CPUID_USE_XFAM_XMOD) != CPUID_USE_XFAM_XMOD) ||
 500                     ((eax & CPUID_XMOD) > CPUID_XMOD_REV_MASK)) {
 501                         printk(KERN_INFO PFX "Processor cpuid %x not supported\n", eax);
 502                         goto out;
 503                 }
 504
 505                 eax = cpuid_eax(CPUID_GET_MAX_CAPABILITIES);
 506                 if (eax < CPUID_FREQ_VOLT_CAPABILITIES) {
 507                         printk(KERN_INFO PFX
 508                                "No frequency change capabilities detected\n");
 509                         goto out;
 510                 }
 511
 512                 cpuid(CPUID_FREQ_VOLT_CAPABILITIES, &eax, &ebx, &ecx, &edx);
 513                 if ((edx & P_STATE_TRANSITION_CAPABLE) != P_STATE_TRANSITION_CAPABLE) {
 514                         printk(KERN_INFO PFX "Power state transitions not supported\n");
 515                         goto out;
 516                 }
 517         } else { /* must be a HW Pstate capable processor */
 518                 cpuid(CPUID_FREQ_VOLT_CAPABILITIES, &eax, &ebx, &ecx, &edx);
 519                 if ((edx & USE_HW_PSTATE) == USE_HW_PSTATE)
 520                         cpu_family = CPU_HW_PSTATE;
 521                 else
 522                         goto out;
 523         }
 524
 525         rc = 1;
 526
 527 out:
 528         set_cpus_allowed_ptr(current, &oldmask);
 529         return rc;
 530 }
 531
 532 static int check_pst_table(struct powernow_k8_data *data, struct pst_s *pst, u8 maxvid)
 533 {
 534         unsigned int j;
 535         u8 lastfid = 0xff;
 536
 537         for (j = 0; j < data->numps; j++) {
 538                 if (pst[j].vid > LEAST_VID) {
 539                         printk(KERN_ERR PFX "vid %d invalid : 0x%x\n", j, pst[j].vid);
 540                         return -EINVAL;
 541                 }
 542                 if (pst[j].vid < data->rvo) {   /* vid + rvo >= 0 */
 543                         printk(KERN_ERR BFX "0 vid exceeded with pstate %d\n", j);
 544                         return -ENODEV;
 545                 }
 546                 if (pst[j].vid < maxvid + data->rvo) {  /* vid + rvo >= maxvid */
 547                         printk(KERN_ERR BFX "maxvid exceeded with pstate %d\n", j);
 548                         return -ENODEV;
 549                 }
 550                 if (pst[j].fid > MAX_FID) {
 551                         printk(KERN_ERR BFX "maxfid exceeded with pstate %d\n", j);
 552                         return -ENODEV;
 553                 }
 554                 if (j && (pst[j].fid < HI_FID_TABLE_BOTTOM)) {
 555                         /* Only first fid is allowed to be in "low" range */
 556                         printk(KERN_ERR BFX "two low fids - %d : 0x%x\n", j, pst[j].fid);
 557                         return -EINVAL;
 558                 }
 559                 if (pst[j].fid < lastfid)
 560                         lastfid = pst[j].fid;
 561         }
 562         if (lastfid & 1) {
 563                 printk(KERN_ERR BFX "lastfid invalid\n");
 564                 return -EINVAL;
 565         }
 566         if (lastfid > LO_FID_TABLE_TOP)
 567                 printk(KERN_INFO BFX  "first fid not from lo freq table\n");
 568
 569         return 0;
 570 }
 571
 572 static void print_basics(struct powernow_k8_data *data)
 573 {
 574         int j;
 575         for (j = 0; j < data->numps; j++) {
 576                 if (data->powernow_table[j].frequency != CPUFREQ_ENTRY_INVALID) {
 577                         if (cpu_family == CPU_HW_PSTATE) {
 578                                 printk(KERN_INFO PFX "   %d : pstate %d (%d MHz)\n",
 579                                         j,
 580                                         data->powernow_table[j].index,
 581                                         data->powernow_table[j].frequency/1000);
 582                         } else {
 583                                 printk(KERN_INFO PFX "   %d : fid 0x%x (%d MHz), vid 0x%x\n",
 584                                         j,
 585                                         data->powernow_table[j].index & 0xff,
 586                                         data->powernow_table[j].frequency/1000,
 587                                         data->powernow_table[j].index >> 8);
 588                         }
 589                 }
 590         }
 591         if (data->batps)
 592                 printk(KERN_INFO PFX "Only %d pstates on battery\n", data->batps);
 593 }
 594
 595 static int fill_powernow_table(struct powernow_k8_data *data, struct pst_s *pst, u8 maxvid)
 596 {
 597         struct cpufreq_frequency_table *powernow_table;
 598         unsigned int j;
 599
 600         if (data->batps) {    /* use ACPI support to get full speed on mains power */
 601                 printk(KERN_WARNING PFX "Only %d pstates usable (use ACPI driver for full range\n", data->batps);
 602                 data->numps = data->batps;
 603         }
 604
 605         for ( j=1; j<data->numps; j++ ) {
 606                 if (pst[j-1].fid >= pst[j].fid) {
 607                         printk(KERN_ERR PFX "PST out of sequence\n");
 608                         return -EINVAL;
 609                 }
 610         }
 611
 612         if (data->numps < 2) {
 613                 printk(KERN_ERR PFX "no p states to transition\n");
 614                 return -ENODEV;
 615         }
 616
 617         if (check_pst_table(data, pst, maxvid))
 618                 return -EINVAL;
 619
 620         powernow_table = kmalloc((sizeof(struct cpufreq_frequency_table)
 621                 * (data->numps + 1)), GFP_KERNEL);
 622         if (!powernow_table) {
 623                 printk(KERN_ERR PFX "powernow_table memory alloc failure\n");
 624                 return -ENOMEM;
 625         }
 626
 627         for (j = 0; j < data->numps; j++) {
 628                 powernow_table[j].index = pst[j].fid; /* lower 8 bits */
 629                 powernow_table[j].index |= (pst[j].vid << 8); /* upper 8 bits */
 630                 powernow_table[j].frequency = find_khz_freq_from_fid(pst[j].fid);
 631         }
 632         powernow_table[data->numps].frequency = CPUFREQ_TABLE_END;
 633         powernow_table[data->numps].index = 0;
 634
 635         if (query_current_values_with_pending_wait(data)) {
 636                 kfree(powernow_table);
 637                 return -EIO;
 638         }
 639
 640         dprintk("cfid 0x%x, cvid 0x%x\n", data->currfid, data->currvid);
 641         data->powernow_table = powernow_table;
 642         if (first_cpu(per_cpu(cpu_core_map, data->cpu)) == data->cpu)
 643                 print_basics(data);
 644
 645         for (j = 0; j < data->numps; j++)
 646                 if ((pst[j].fid==data->currfid) && (pst[j].vid==data->currvid))
 647                         return 0;
 648
 649         dprintk("currfid/vid do not match PST, ignoring\n");
 650         return 0;
 651 }
 652
 653 /* Find and validate the PSB/PST table in BIOS. */
 654 static int find_psb_table(struct powernow_k8_data *data)
 655 {
 656         struct psb_s *psb;
 657         unsigned int i;
 658         u32 mvs;
 659         u8 maxvid;
 660         u32 cpst = 0;
 661         u32 thiscpuid;
 662
 663         for (i = 0xc0000; i < 0xffff0; i += 0x10) {
 664                 /* Scan BIOS looking for the signature. */
 665                 /* It can not be at ffff0 - it is too big. */
 666
 667                 psb = phys_to_virt(i);
 668                 if (memcmp(psb, PSB_ID_STRING, PSB_ID_STRING_LEN) != 0)
 669                         continue;
 670
 671                 dprintk("found PSB header at 0x%p\n", psb);
 672
 673                 dprintk("table vers: 0x%x\n", psb->tableversion);
 674                 if (psb->tableversion != PSB_VERSION_1_4) {
 675                         printk(KERN_ERR BFX "PSB table is not v1.4\n");
 676                         return -ENODEV;
 677                 }
 678
 679                 dprintk("flags: 0x%x\n", psb->flags1);
 680                 if (psb->flags1) {
 681                         printk(KERN_ERR BFX "unknown flags\n");
 682                         return -ENODEV;
 683                 }
 684
 685                 data->vstable = psb->vstable;
 686                 dprintk("voltage stabilization time: %d(*20us)\n", data->vstable);
 687
 688                 dprintk("flags2: 0x%x\n", psb->flags2);
 689                 data->rvo = psb->flags2 & 3;
 690                 data->irt = ((psb->flags2) >> 2) & 3;
 691                 mvs = ((psb->flags2) >> 4) & 3;
 692                 data->vidmvs = 1 << mvs;
 693                 data->batps = ((psb->flags2) >> 6) & 3;
 694
 695                 dprintk("ramp voltage offset: %d\n", data->rvo);
 696                 dprintk("isochronous relief time: %d\n", data->irt);
 697                 dprintk("maximum voltage step: %d - 0x%x\n", mvs, data->vidmvs);
 698
 699                 dprintk("numpst: 0x%x\n", psb->num_tables);
 700                 cpst = psb->num_tables;
 701                 if ((psb->cpuid == 0x00000fc0) || (psb->cpuid == 0x00000fe0) ){
 702                         thiscpuid = cpuid_eax(CPUID_PROCESSOR_SIGNATURE);
 703                         if ((thiscpuid == 0x00000fc0) || (thiscpuid == 0x00000fe0) ) {
 704                                 cpst = 1;
 705                         }
 706                 }
 707                 if (cpst != 1) {
 708                         printk(KERN_ERR BFX "numpst must be 1\n");
 709                         return -ENODEV;
 710                 }
 711
 712                 data->plllock = psb->plllocktime;
 713                 dprintk("plllocktime: 0x%x (units 1us)\n", psb->plllocktime);
 714                 dprintk("maxfid: 0x%x\n", psb->maxfid);
 715                 dprintk("maxvid: 0x%x\n", psb->maxvid);
 716                 maxvid = psb->maxvid;
 717
 718                 data->numps = psb->numps;
 719                 dprintk("numpstates: 0x%x\n", data->numps);
 720                 return fill_powernow_table(data, (struct pst_s *)(psb+1), maxvid);
 721         }
 722         /*
 723          * If you see this message, complain to BIOS manufacturer. If
 724          * he tells you "we do not support Linux" or some similar
 725          * nonsense, remember that Windows 2000 uses the same legacy
 726          * mechanism that the old Linux PSB driver uses. Tell them it
 727          * is broken with Windows 2000.
 728          *
 729          * The reference to the AMD documentation is chapter 9 in the
 730          * BIOS and Kernel Developer's Guide, which is available on
 731          * www.amd.com
 732          */
 733         printk(KERN_ERR PFX "BIOS error - no PSB or ACPI _PSS objects\n");
 734         return -ENODEV;
 735 }
 736
 737 #ifdef CONFIG_X86_POWERNOW_K8_ACPI
 738 static void powernow_k8_acpi_pst_values(struct powernow_k8_data *data, unsigned int index)
 739 {
 740         if (!data->acpi_data.state_count || (cpu_family == CPU_HW_PSTATE))
 741                 return;
 742
 743         data->irt = (data->acpi_data.states[index].control >> IRT_SHIFT) & IRT_MASK;
 744         data->rvo = (data->acpi_data.states[index].control >> RVO_SHIFT) & RVO_MASK;
 745         data->exttype = (data->acpi_data.states[index].control >> EXT_TYPE_SHIFT) & EXT_TYPE_MASK;
 746         data->plllock = (data->acpi_data.states[index].control >> PLL_L_SHIFT) & PLL_L_MASK;
 747         data->vidmvs = 1 << ((data->acpi_data.states[index].control >> MVS_SHIFT) & MVS_MASK);
 748         data->vstable = (data->acpi_data.states[index].control >> VST_SHIFT) & VST_MASK;
 749 }
 750
 751 static int powernow_k8_cpu_init_acpi(struct powernow_k8_data *data)
 752 {
 753         struct cpufreq_frequency_table *powernow_table;
 754         int ret_val;
 755
 756         if (acpi_processor_register_performance(&data->acpi_data, data->cpu)) {
 757                 dprintk("register performance failed: bad ACPI data\n");
 758                 return -EIO;
 759         }
 760
 761         /* verify the data contained in the ACPI structures */
 762         if (data->acpi_data.state_count <= 1) {
 763                 dprintk("No ACPI P-States\n");
 764                 goto err_out;
 765         }
 766
 767         if ((data->acpi_data.control_register.space_id != ACPI_ADR_SPACE_FIXED_HARDWARE) ||
 768                 (data->acpi_data.status_register.space_id != ACPI_ADR_SPACE_FIXED_HARDWARE)) {
 769                 dprintk("Invalid control/status registers (%x - %x)\n",
 770                         data->acpi_data.control_register.space_id,
 771                         data->acpi_data.status_register.space_id);
 772                 goto err_out;
 773         }
 774
 775         /* fill in data->powernow_table */
 776         powernow_table = kmalloc((sizeof(struct cpufreq_frequency_table)
 777                 * (data->acpi_data.state_count + 1)), GFP_KERNEL);
 778         if (!powernow_table) {
 779                 dprintk("powernow_table memory alloc failure\n");
 780                 goto err_out;
 781         }
 782
 783         if (cpu_family == CPU_HW_PSTATE)
 784                 ret_val = fill_powernow_table_pstate(data, powernow_table);
 785         else
 786                 ret_val = fill_powernow_table_fidvid(data, powernow_table);
 787         if (ret_val)
 788                 goto err_out_mem;
 789
 790         powernow_table[data->acpi_data.state_count].frequency = CPUFREQ_TABLE_END;
 791         powernow_table[data->acpi_data.state_count].index = 0;
 792         data->powernow_table = powernow_table;
 793
 794         /* fill in data */
 795         data->numps = data->acpi_data.state_count;
 796         if (first_cpu(per_cpu(cpu_core_map, data->cpu)) == data->cpu)
 797                 print_basics(data);
 798         powernow_k8_acpi_pst_values(data, 0);
 799
 800         /* notify BIOS that we exist */
 801         acpi_processor_notify_smm(THIS_MODULE);
 802
 803         return 0;
 804
 805 err_out_mem:
 806         kfree(powernow_table);
 807
 808 err_out:
 809         acpi_processor_unregister_performance(&data->acpi_data, data->cpu);
 810
 811         /* data->acpi_data.state_count informs us at ->exit() whether ACPI was used */
 812         data->acpi_data.state_count = 0;
 813
 814         return -ENODEV;
 815 }
 816
 817 static int fill_powernow_table_pstate(struct powernow_k8_data *data, struct cpufreq_frequency_table *powernow_table)
 818 {
 819         int i;
 820         u32 hi = 0, lo = 0;
 821         rdmsr(MSR_PSTATE_CUR_LIMIT, hi, lo);
 822         data->max_hw_pstate = (hi & HW_PSTATE_MAX_MASK) >> HW_PSTATE_MAX_SHIFT;
 823
 824         for (i = 0; i < data->acpi_data.state_count; i++) {
 825                 u32 index;
 826
 827                 index = data->acpi_data.states[i].control & HW_PSTATE_MASK;
 828                 if (index > data->max_hw_pstate) {
 829                         printk(KERN_ERR PFX "invalid pstate %d - bad value %d.\n", i, index);
 830                         printk(KERN_ERR PFX "Please report to BIOS manufacturer\n");
 831                         powernow_table[i].frequency = CPUFREQ_ENTRY_INVALID;
 832                         continue;
 833                 }
 834                 rdmsr(MSR_PSTATE_DEF_BASE + index, lo, hi);
 835                 if (!(hi & HW_PSTATE_VALID_MASK)) {
 836                         dprintk("invalid pstate %d, ignoring\n", index);
 837                         powernow_table[i].frequency = CPUFREQ_ENTRY_INVALID;
 838                         continue;
 839                 }
 840
 841                 powernow_table[i].index = index;
 842
 843                 powernow_table[i].frequency = data->acpi_data.states[i].core_frequency * 1000;
 844         }
 845         return 0;
 846 }
 847
 848 static int fill_powernow_table_fidvid(struct powernow_k8_data *data, struct cpufreq_frequency_table *powernow_table)
 849 {
 850         int i;
 851         int cntlofreq = 0;
 852         for (i = 0; i < data->acpi_data.state_count; i++) {
 853                 u32 fid;
 854                 u32 vid;
 855
 856                 if (data->exttype) {
 857                         fid = data->acpi_data.states[i].status & EXT_FID_MASK;
 858                         vid = (data->acpi_data.states[i].status >> VID_SHIFT) & EXT_VID_MASK;
 859                 } else {
 860                         fid = data->acpi_data.states[i].control & FID_MASK;
 861                         vid = (data->acpi_data.states[i].control >> VID_SHIFT) & VID_MASK;
 862                 }
 863
 864                 dprintk("   %d : fid 0x%x, vid 0x%x\n", i, fid, vid);
 865
 866                 powernow_table[i].index = fid; /* lower 8 bits */
 867                 powernow_table[i].index |= (vid << 8); /* upper 8 bits */
 868                 powernow_table[i].frequency = find_khz_freq_from_fid(fid);
 869
 870                 /* verify frequency is OK */
 871                 if ((powernow_table[i].frequency > (MAX_FREQ * 1000)) ||
 872                         (powernow_table[i].frequency < (MIN_FREQ * 1000))) {
 873                         dprintk("invalid freq %u kHz, ignoring\n", powernow_table[i].frequency);
 874                         powernow_table[i].frequency = CPUFREQ_ENTRY_INVALID;
 875                         continue;
 876                 }
 877
 878                 /* verify voltage is OK - BIOSs are using "off" to indicate invalid */
 879                 if (vid == VID_OFF) {
 880                         dprintk("invalid vid %u, ignoring\n", vid);
 881                         powernow_table[i].frequency = CPUFREQ_ENTRY_INVALID;
 882                         continue;
 883                 }
 884
 885                 /* verify only 1 entry from the lo frequency table */
 886                 if (fid < HI_FID_TABLE_BOTTOM) {
 887                         if (cntlofreq) {
 888                                 /* if both entries are the same, ignore this one ... */
 889                                 if ((powernow_table[i].frequency != powernow_table[cntlofreq].frequency) ||
 890                                     (powernow_table[i].index != powernow_table[cntlofreq].index)) {
 891                                         printk(KERN_ERR PFX "Too many lo freq table entries\n");
 892                                         return 1;
 893                                 }
 894
 895                                 dprintk("double low frequency table entry, ignoring it.\n");
 896                                 powernow_table[i].frequency = CPUFREQ_ENTRY_INVALID;
 897                                 continue;
 898                         } else
 899                                 cntlofreq = i;
 900                 }
 901
 902                 if (powernow_table[i].frequency != (data->acpi_data.states[i].core_frequency * 1000)) {
 903                         printk(KERN_INFO PFX "invalid freq entries %u kHz vs. %u kHz\n",
 904                                 powernow_table[i].frequency,
 905                                 (unsigned int) (data->acpi_data.states[i].core_frequency * 1000));
 906                         powernow_table[i].frequency = CPUFREQ_ENTRY_INVALID;
 907                         continue;
 908                 }
 909         }
 910         return 0;
 911 }
 912
 913 static void powernow_k8_cpu_exit_acpi(struct powernow_k8_data *data)
 914 {
 915         if (data->acpi_data.state_count)
 916                 acpi_processor_unregister_performance(&data->acpi_data, data->cpu);
 917 }
 918
 919 #else
 920 static int powernow_k8_cpu_init_acpi(struct powernow_k8_data *data) { return -ENODEV; }
 921 static void powernow_k8_cpu_exit_acpi(struct powernow_k8_data *data) { return; }
 922 static void powernow_k8_acpi_pst_values(struct powernow_k8_data *data, unsigned int index) { return; }
 923 #endif /* CONFIG_X86_POWERNOW_K8_ACPI */
 924
 925 /* Take a frequency, and issue the fid/vid transition command */
 926 static int transition_frequency_fidvid(struct powernow_k8_data *data, unsigned int index)
 927 {
 928         u32 fid = 0;
 929         u32 vid = 0;
 930         int res, i;
 931         struct cpufreq_freqs freqs;
 932
 933         dprintk("cpu %d transition to index %u\n", smp_processor_id(), index);
 934
 935         /* fid/vid correctness check for k8 */
 936         /* fid are the lower 8 bits of the index we stored into
 937          * the cpufreq frequency table in find_psb_table, vid
 938          * are the upper 8 bits.
 939          */
 940         fid = data->powernow_table[index].index & 0xFF;
 941         vid = (data->powernow_table[index].index & 0xFF00) >> 8;
 942
 943         dprintk("table matched fid 0x%x, giving vid 0x%x\n", fid, vid);
 944
 945         if (query_current_values_with_pending_wait(data))
 946                 return 1;
 947
 948         if ((data->currvid == vid) && (data->currfid == fid)) {
 949                 dprintk("target matches current values (fid 0x%x, vid 0x%x)\n",
 950                         fid, vid);
 951                 return 0;
 952         }
 953
 954         if ((fid < HI_FID_TABLE_BOTTOM) && (data->currfid < HI_FID_TABLE_BOTTOM)) {
 955                 printk(KERN_ERR PFX
 956                        "ignoring illegal change in lo freq table-%x to 0x%x\n",
 957                        data->currfid, fid);
 958                 return 1;
 959         }
 960
 961         dprintk("cpu %d, changing to fid 0x%x, vid 0x%x\n",
 962                 smp_processor_id(), fid, vid);
 963         freqs.old = find_khz_freq_from_fid(data->currfid);
 964         freqs.new = find_khz_freq_from_fid(fid);
 965
 966         for_each_cpu_mask_nr(i, *(data->available_cores)) {
 967                 freqs.cpu = i;
 968                 cpufreq_notify_transition(&freqs, CPUFREQ_PRECHANGE);
 969         }
 970
 971         res = transition_fid_vid(data, fid, vid);
 972         freqs.new = find_khz_freq_from_fid(data->currfid);
 973
 974         for_each_cpu_mask_nr(i, *(data->available_cores)) {
 975                 freqs.cpu = i;
 976                 cpufreq_notify_transition(&freqs, CPUFREQ_POSTCHANGE);
 977         }
 978         return res;
 979 }
 980
 981 /* Take a frequency, and issue the hardware pstate transition command */
 982 static int transition_frequency_pstate(struct powernow_k8_data *data, unsigned int index)
 983 {
 984         u32 pstate = 0;
 985         int res, i;
 986         struct cpufreq_freqs freqs;
 987
 988         dprintk("cpu %d transition to index %u\n", smp_processor_id(), index);
 989
 990         /* get MSR index for hardware pstate transition */
 991         pstate = index & HW_PSTATE_MASK;
 992         if (pstate > data->max_hw_pstate)
 993                 return 0;
 994         freqs.old = find_khz_freq_from_pstate(data->powernow_table, data->currpstate);
 995         freqs.new = find_khz_freq_from_pstate(data->powernow_table, pstate);
 996
 997         for_each_cpu_mask_nr(i, *(data->available_cores)) {
 998                 freqs.cpu = i;
 999                 cpufreq_notify_transition(&freqs, CPUFREQ_PRECHANGE);
1000         }
1001
1002         res = transition_pstate(data, pstate);
1003         freqs.new = find_khz_freq_from_pstate(data->powernow_table, pstate);
1004
1005         for_each_cpu_mask_nr(i, *(data->available_cores)) {
1006                 freqs.cpu = i;
1007                 cpufreq_notify_transition(&freqs, CPUFREQ_POSTCHANGE);
1008         }
1009         return res;
1010 }
1011
1012 /* Driver entry point to switch to the target frequency */
1013 static int powernowk8_target(struct cpufreq_policy *pol, unsigned targfreq, unsigned relation)
1014 {
1015         cpumask_t oldmask;
1016         struct powernow_k8_data *data = per_cpu(powernow_data, pol->cpu);
1017         u32 checkfid;
1018         u32 checkvid;
1019         unsigned int newstate;
1020         int ret = -EIO;
1021
1022         if (!data)
1023                 return -EINVAL;
1024
1025         checkfid = data->currfid;
1026         checkvid = data->currvid;
1027
1028         /* only run on specific CPU from here on */
1029         oldmask = current->cpus_allowed;
1030         set_cpus_allowed_ptr(current, &cpumask_of_cpu(pol->cpu));
1031
1032         if (smp_processor_id() != pol->cpu) {
1033                 printk(KERN_ERR PFX "limiting to cpu %u failed\n", pol->cpu);
1034                 goto err_out;
1035         }
1036
1037         if (pending_bit_stuck()) {
1038                 printk(KERN_ERR PFX "failing targ, change pending bit set\n");
1039                 goto err_out;
1040         }
1041
1042         dprintk("targ: cpu %d, %d kHz, min %d, max %d, relation %d\n",
1043                 pol->cpu, targfreq, pol->min, pol->max, relation);
1044
1045         if (query_current_values_with_pending_wait(data))
1046                 goto err_out;
1047
1048         if (cpu_family != CPU_HW_PSTATE) {
1049                 dprintk("targ: curr fid 0x%x, vid 0x%x\n",
1050                 data->currfid, data->currvid);
1051
1052                 if ((checkvid != data->currvid) || (checkfid != data->currfid)) {
1053                         printk(KERN_INFO PFX
1054                                 "error - out of sync, fix 0x%x 0x%x, vid 0x%x 0x%x\n",
1055                                 checkfid, data->currfid, checkvid, data->currvid);
1056                 }
1057         }
1058
1059         if (cpufreq_frequency_table_target(pol, data->powernow_table, targfreq, relation, &newstate))
1060                 goto err_out;
1061
1062         mutex_lock(&fidvid_mutex);
1063
1064         powernow_k8_acpi_pst_values(data, newstate);
1065
1066         if (cpu_family == CPU_HW_PSTATE)
1067                 ret = transition_frequency_pstate(data, newstate);
1068         else
1069                 ret = transition_frequency_fidvid(data, newstate);
1070         if (ret) {
1071                 printk(KERN_ERR PFX "transition frequency failed\n");
1072                 ret = 1;
1073                 mutex_unlock(&fidvid_mutex);
1074                 goto err_out;
1075         }
1076         mutex_unlock(&fidvid_mutex);
1077
1078         if (cpu_family == CPU_HW_PSTATE)
1079                 pol->cur = find_khz_freq_from_pstate(data->powernow_table, newstate);
1080         else
1081                 pol->cur = find_khz_freq_from_fid(data->currfid);
1082         ret = 0;
1083
1084 err_out:
1085         set_cpus_allowed_ptr(current, &oldmask);
1086         return ret;
1087 }
1088
1089 /* Driver entry point to verify the policy and range of frequencies */
1090 static int powernowk8_verify(struct cpufreq_policy *pol)
1091 {
1092         struct powernow_k8_data *data = per_cpu(powernow_data, pol->cpu);
1093
1094         if (!data)
1095                 return -EINVAL;
1096
1097         return cpufreq_frequency_table_verify(pol, data->powernow_table);
1098 }
1099
1100 /* per CPU init entry point to the driver */
1101 static int __cpuinit powernowk8_cpu_init(struct cpufreq_policy *pol)
1102 {
1103         struct powernow_k8_data *data;
1104         cpumask_t oldmask;
1105         int rc;
1106
1107         if (!cpu_online(pol->cpu))
1108                 return -ENODEV;
1109
1110         if (!check_supported_cpu(pol->cpu))
1111                 return -ENODEV;
1112
1113         data = kzalloc(sizeof(struct powernow_k8_data), GFP_KERNEL);
1114         if (!data) {
1115                 printk(KERN_ERR PFX "unable to alloc powernow_k8_data");
1116                 return -ENOMEM;
1117         }
1118
1119         data->cpu = pol->cpu;
1120
1121         if (powernow_k8_cpu_init_acpi(data)) {
1122                 /*
1123                  * Use the PSB BIOS structure. This is only availabe on
1124                  * an UP version, and is deprecated by AMD.
1125                  */
1126                 if (num_online_cpus() != 1) {
1127 #ifndef CONFIG_ACPI_PROCESSOR
1128                         printk(KERN_ERR PFX "ACPI Processor support is required "
1129                                "for SMP systems but is absent. Please load the "
1130                                "ACPI Processor module before starting this "
1131                                "driver.\n");
1132 #else
1133                         printk(KERN_ERR PFX "Your BIOS does not provide ACPI "
1134                                "_PSS objects in a way that Linux understands. "
1135                                "Please report this to the Linux ACPI maintainers"
1136                                " and complain to your BIOS vendor.\n");
1137 #endif
1138                         kfree(data);
1139                         return -ENODEV;
1140                 }
1141                 if (pol->cpu != 0) {
1142                         printk(KERN_ERR PFX "No ACPI _PSS objects for CPU other than "
1143                                "CPU0. Complain to your BIOS vendor.\n");
1144                         kfree(data);
1145                         return -ENODEV;
1146                 }
1147                 rc = find_psb_table(data);
1148                 if (rc) {
1149                         kfree(data);
1150                         return -ENODEV;
1151                 }
1152         }
1153
1154         /* only run on specific CPU from here on */
1155         oldmask = current->cpus_allowed;
1156         set_cpus_allowed_ptr(current, &cpumask_of_cpu(pol->cpu));
1157
1158         if (smp_processor_id() != pol->cpu) {
1159                 printk(KERN_ERR PFX "limiting to cpu %u failed\n", pol->cpu);
1160                 goto err_out;
1161         }
1162
1163         if (pending_bit_stuck()) {
1164                 printk(KERN_ERR PFX "failing init, change pending bit set\n");
1165                 goto err_out;
1166         }
1167
1168         if (query_current_values_with_pending_wait(data))
1169                 goto err_out;
1170
1171         if (cpu_family == CPU_OPTERON)
1172                 fidvid_msr_init();
1173
1174         /* run on any CPU again */
1175         set_cpus_allowed_ptr(current, &oldmask);
1176
1177         if (cpu_family == CPU_HW_PSTATE)
1178                 pol->cpus = cpumask_of_cpu(pol->cpu);
1179         else
1180                 pol->cpus = per_cpu(cpu_core_map, pol->cpu);
1181         data->available_cores = &(pol->cpus);
1182
1183         /* Take a crude guess here.
1184          * That guess was in microseconds, so multiply with 1000 */
1185         pol->cpuinfo.transition_latency = (((data->rvo + 8) * data->vstable * VST_UNITS_20US)
1186             + (3 * (1 << data->irt) * 10)) * 1000;
1187
1188         if (cpu_family == CPU_HW_PSTATE)
1189                 pol->cur = find_khz_freq_from_pstate(data->powernow_table, data->currpstate);
1190         else
1191                 pol->cur = find_khz_freq_from_fid(data->currfid);
1192         dprintk("policy current frequency %d kHz\n", pol->cur);
1193
1194         /* min/max the cpu is capable of */
1195         if (cpufreq_frequency_table_cpuinfo(pol, data->powernow_table)) {
1196                 printk(KERN_ERR PFX "invalid powernow_table\n");
1197                 powernow_k8_cpu_exit_acpi(data);
1198                 kfree(data->powernow_table);
1199                 kfree(data);
1200                 return -EINVAL;
1201         }
1202
1203         cpufreq_frequency_table_get_attr(data->powernow_table, pol->cpu);
1204
1205         if (cpu_family == CPU_HW_PSTATE)
1206                 dprintk("cpu_init done, current pstate 0x%x\n", data->currpstate);
1207         else
1208                 dprintk("cpu_init done, current fid 0x%x, vid 0x%x\n",
1209                         data->currfid, data->currvid);
1210
1211         per_cpu(powernow_data, pol->cpu) = data;
1212
1213         return 0;
1214
1215 err_out:
1216         set_cpus_allowed_ptr(current, &oldmask);
1217         powernow_k8_cpu_exit_acpi(data);
1218
1219         kfree(data);
1220         return -ENODEV;
1221 }
1222
1223 static int __devexit powernowk8_cpu_exit (struct cpufreq_policy *pol)
1224 {
1225         struct powernow_k8_data *data = per_cpu(powernow_data, pol->cpu);
1226
1227         if (!data)
1228                 return -EINVAL;
1229
1230         powernow_k8_cpu_exit_acpi(data);
1231
1232         cpufreq_frequency_table_put_attr(pol->cpu);
1233
1234         kfree(data->powernow_table);
1235         kfree(data);
1236
1237         return 0;
1238 }
1239
1240 static unsigned int powernowk8_get (unsigned int cpu)
1241 {
1242         struct powernow_k8_data *data;
1243         cpumask_t oldmask = current->cpus_allowed;
1244         unsigned int khz = 0;
1245         unsigned int first;
1246
1247         first = first_cpu(per_cpu(cpu_core_map, cpu));
1248         data = per_cpu(powernow_data, first);
1249
1250         if (!data)
1251                 return -EINVAL;
1252
1253         set_cpus_allowed_ptr(current, &cpumask_of_cpu(cpu));
1254         if (smp_processor_id() != cpu) {
1255                 printk(KERN_ERR PFX
1256                         "limiting to CPU %d failed in powernowk8_get\n", cpu);
1257                 set_cpus_allowed_ptr(current, &oldmask);
1258                 return 0;
1259         }
1260
1261         if (query_current_values_with_pending_wait(data))
1262                 goto out;
1263
1264         if (cpu_family == CPU_HW_PSTATE)
1265                 khz = find_khz_freq_from_pstate(data->powernow_table,
1266                                                 data->currpstate);
1267         else
1268                 khz = find_khz_freq_from_fid(data->currfid);
1269
1270
1271 out:
1272         set_cpus_allowed_ptr(current, &oldmask);
1273         return khz;
1274 }
1275
1276 static struct freq_attr* powernow_k8_attr[] = {
1277         &cpufreq_freq_attr_scaling_available_freqs,
1278         NULL,
1279 };
1280
1281 static struct cpufreq_driver cpufreq_amd64_driver = {
1282         .verify = powernowk8_verify,
1283         .target = powernowk8_target,
1284         .init = powernowk8_cpu_init,
1285         .exit = __devexit_p(powernowk8_cpu_exit),
1286         .get = powernowk8_get,
1287         .name = "powernow-k8",
1288         .owner = THIS_MODULE,
1289         .attr = powernow_k8_attr,
1290 };
1291
1292 /* driver entry point for init */
1293 static int __cpuinit powernowk8_init(void)
1294 {
1295         unsigned int i, supported_cpus = 0;
1296
1297         for_each_online_cpu(i) {
1298                 if (check_supported_cpu(i))
1299                         supported_cpus++;
1300         }
1301
1302         if (supported_cpus == num_online_cpus()) {
1303                 printk(KERN_INFO PFX "Found %d %s "
1304                         "processors (%d cpu cores) (" VERSION ")\n",
1305                         num_online_nodes(),
1306                         boot_cpu_data.x86_model_id, supported_cpus);
1307                 return cpufreq_register_driver(&cpufreq_amd64_driver);
1308         }
1309
1310         return -ENODEV;
1311 }
1312
1313 /* driver entry point for term */
1314 static void __exit powernowk8_exit(void)
1315 {
1316         dprintk("exit\n");
1317
1318         cpufreq_unregister_driver(&cpufreq_amd64_driver);
1319 }
1320
1321 MODULE_AUTHOR("Paul Devriendt <paul.devriendt@amd.com> and Mark Langsdorf <mark.langsdorf@amd.com>");
1322 MODULE_DESCRIPTION("AMD Athlon 64 and Opteron processor frequency driver.");
1323 MODULE_LICENSE("GPL");
1324
1325 late_initcall(powernowk8_init);
1326 module_exit(powernowk8_exit);