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

   1 /*
   2  *   (c) 2003-2006 Advanced Micro Devices, Inc.
   3  *  Your use of this code is subject to the terms and conditions of the
   4  *  GNU general public license version 2. See "COPYING" or
   5  *  http://www.gnu.org/licenses/gpl.html
   6  *
   7  *  Support : mark.langsdorf@amd.com
   8  *
   9  *  Based on the powernow-k7.c module written by Dave Jones.
  10  *  (C) 2003 Dave Jones <davej@codemonkey.org.uk> on behalf of SuSE Labs
  11  *  (C) 2004 Dominik Brodowski <linux@brodo.de>
  12  *  (C) 2004 Pavel Machek <pavel@suse.cz>
  13  *  Licensed under the terms of the GNU GPL License version 2.
  14  *  Based upon datasheets & sample CPUs kindly provided by AMD.
  15  *
  16  *  Valuable input gratefully received from Dave Jones, Pavel Machek,
  17  *  Dominik Brodowski, Jacob Shin, and others.
  18  *  Originally developed by Paul Devriendt.
  19  *  Processor information obtained from Chapter 9 (Power and Thermal Management)
  20  *  of the "BIOS and Kernel Developer's Guide for the AMD Athlon 64 and AMD
  21  *  Opteron Processors" available for download from www.amd.com
  22  *
  23  *  Tables for specific CPUs can be inferred from
  24  *     http://www.amd.com/us-en/assets/content_type/white_papers_and_tech_docs/30430.pdf
  25  */
  26
  27 #include <linux/kernel.h>
  28 #include <linux/smp.h>
  29 #include <linux/module.h>
  30 #include <linux/init.h>
  31 #include <linux/cpufreq.h>
  32 #include <linux/slab.h>
  33 #include <linux/string.h>
  34 #include <linux/cpumask.h>
  35 #include <linux/sched.h>        /* for current / set_cpus_allowed() */
  36
  37 #include <asm/msr.h>
  38 #include <asm/io.h>
  39 #include <asm/delay.h>
  40
  41 #ifdef CONFIG_X86_POWERNOW_K8_ACPI
  42 #include <linux/acpi.h>
  43 #include <linux/mutex.h>
  44 #include <acpi/processor.h>
  45 #endif
  46
  47 #define PFX "powernow-k8: "
  48 #define BFX PFX "BIOS error: "
  49 #define VERSION "version 2.20.00"
  50 #include "powernow-k8.h"
  51
  52 /* serialize freq changes  */
  53 static DEFINE_MUTEX(fidvid_mutex);
  54
  55 static DEFINE_PER_CPU(struct powernow_k8_data *, powernow_data);
  56
  57 static int cpu_family = CPU_OPTERON;
  58
  59 #ifndef CONFIG_SMP
  60 DEFINE_PER_CPU(cpumask_t, cpu_core_map);
  61 #endif
  62
  63 /* Return a frequency in MHz, given an input fid */
  64 static u32 find_freq_from_fid(u32 fid)
  65 {
  66         return 800 + (fid * 100);
  67 }
  68
  69
  70 /* Return a frequency in KHz, given an input fid */
  71 static u32 find_khz_freq_from_fid(u32 fid)
  72 {
  73         return 1000 * find_freq_from_fid(fid);
  74 }
  75
  76 static u32 find_khz_freq_from_pstate(struct cpufreq_frequency_table *data, u32 pstate)
  77 {
  78         return data[pstate].frequency;
  79 }
  80
  81
  82 /* Return the vco fid for an input fid
  83  *
  84  * Each "low" fid has corresponding "high" fid, and you can get to "low" fids
  85  * only from corresponding high fids. This returns "high" fid corresponding to
  86  * "low" one.
  87  */
  88 static u32 convert_fid_to_vco_fid(u32 fid)
  89 {
  90         if (fid < HI_FID_TABLE_BOTTOM)
  91                 return 8 + (2 * fid);
  92         else
  93                 return fid;
  94 }
  95
  96 /*
  97  * Return 1 if the pending bit is set. Unless we just instructed the processor
  98  * to transition to a new state, seeing this bit set is really bad news.
  99  */
 100 static int pending_bit_stuck(void)
 101 {
 102         u32 lo, hi;
 103
 104         if (cpu_family == CPU_HW_PSTATE)
 105                 return 0;
 106
 107         rdmsr(MSR_FIDVID_STATUS, lo, hi);
 108         return lo & MSR_S_LO_CHANGE_PENDING ? 1 : 0;
 109 }
 110
 111 /*
 112  * Update the global current fid / vid values from the status msr.
 113  * Returns 1 on error.
 114  */
 115 static int query_current_values_with_pending_wait(struct powernow_k8_data *data)
 116 {
 117         u32 lo, hi;
 118         u32 i = 0;
 119
 120         if (cpu_family == CPU_HW_PSTATE) {
 121                 rdmsr(MSR_PSTATE_STATUS, lo, hi);
 122                 i = lo & HW_PSTATE_MASK;
 123                 data->currpstate = i;
 124                 return 0;
 125         }
 126         do {
 127                 if (i++ > 10000) {
 128                         dprintk("detected change pending stuck\n");
 129                         return 1;
 130                 }
 131                 rdmsr(MSR_FIDVID_STATUS, lo, hi);
 132         } while (lo & MSR_S_LO_CHANGE_PENDING);
 133
 134         data->currvid = hi & MSR_S_HI_CURRENT_VID;
 135         data->currfid = lo & MSR_S_LO_CURRENT_FID;
 136
 137         return 0;
 138 }
 139
 140 /* the isochronous relief time */
 141 static void count_off_irt(struct powernow_k8_data *data)
 142 {
 143         udelay((1 << data->irt) * 10);
 144         return;
 145 }
 146
 147 /* the voltage stabilization time */
 148 static void count_off_vst(struct powernow_k8_data *data)
 149 {
 150         udelay(data->vstable * VST_UNITS_20US);
 151         return;
 152 }
 153
 154 /* need to init the control msr to a safe value (for each cpu) */
 155 static void fidvid_msr_init(void)
 156 {
 157         u32 lo, hi;
 158         u8 fid, vid;
 159
 160         rdmsr(MSR_FIDVID_STATUS, lo, hi);
 161         vid = hi & MSR_S_HI_CURRENT_VID;
 162         fid = lo & MSR_S_LO_CURRENT_FID;
 163         lo = fid | (vid << MSR_C_LO_VID_SHIFT);
 164         hi = MSR_C_HI_STP_GNT_BENIGN;
 165         dprintk("cpu%d, init lo 0x%x, hi 0x%x\n", smp_processor_id(), lo, hi);
 166         wrmsr(MSR_FIDVID_CTL, lo, hi);
 167 }
 168
 169
 170 /* write the new fid value along with the other control fields to the msr */
 171 static int write_new_fid(struct powernow_k8_data *data, u32 fid)
 172 {
 173         u32 lo;
 174         u32 savevid = data->currvid;
 175         u32 i = 0;
 176
 177         if ((fid & INVALID_FID_MASK) || (data->currvid & INVALID_VID_MASK)) {
 178                 printk(KERN_ERR PFX "internal error - overflow on fid write\n");
 179                 return 1;
 180         }
 181
 182         lo = fid | (data->currvid << MSR_C_LO_VID_SHIFT) | MSR_C_LO_INIT_FID_VID;
 183
 184         dprintk("writing fid 0x%x, lo 0x%x, hi 0x%x\n",
 185                 fid, lo, data->plllock * PLL_LOCK_CONVERSION);
 186
 187         do {
 188                 wrmsr(MSR_FIDVID_CTL, lo, data->plllock * PLL_LOCK_CONVERSION);
 189                 if (i++ > 100) {
 190                         printk(KERN_ERR PFX "Hardware error - pending bit very stuck - no further pstate changes possible\n");
 191                         return 1;
 192                 }
 193         } while (query_current_values_with_pending_wait(data));
 194
 195         count_off_irt(data);
 196
 197         if (savevid != data->currvid) {
 198                 printk(KERN_ERR PFX "vid change on fid trans, old 0x%x, new 0x%x\n",
 199                        savevid, data->currvid);
 200                 return 1;
 201         }
 202
 203         if (fid != data->currfid) {
 204                 printk(KERN_ERR PFX "fid trans failed, fid 0x%x, curr 0x%x\n", fid,
 205                         data->currfid);
 206                 return 1;
 207         }
 208
 209         return 0;
 210 }
 211
 212 /* Write a new vid to the hardware */
 213 static int write_new_vid(struct powernow_k8_data *data, u32 vid)
 214 {
 215         u32 lo;
 216         u32 savefid = data->currfid;
 217         int i = 0;
 218
 219         if ((data->currfid & INVALID_FID_MASK) || (vid & INVALID_VID_MASK)) {
 220                 printk(KERN_ERR PFX "internal error - overflow on vid write\n");
 221                 return 1;
 222         }
 223
 224         lo = data->currfid | (vid << MSR_C_LO_VID_SHIFT) | MSR_C_LO_INIT_FID_VID;
 225
 226         dprintk("writing vid 0x%x, lo 0x%x, hi 0x%x\n",
 227                 vid, lo, STOP_GRANT_5NS);
 228
 229         do {
 230                 wrmsr(MSR_FIDVID_CTL, lo, STOP_GRANT_5NS);
 231                 if (i++ > 100) {
 232                         printk(KERN_ERR PFX "internal error - pending bit very stuck - no further pstate changes possible\n");
 233                         return 1;
 234                 }
 235         } while (query_current_values_with_pending_wait(data));
 236
 237         if (savefid != data->currfid) {
 238                 printk(KERN_ERR PFX "fid changed on vid trans, old 0x%x new 0x%x\n",
 239                        savefid, data->currfid);
 240                 return 1;
 241         }
 242
 243         if (vid != data->currvid) {
 244                 printk(KERN_ERR PFX "vid trans failed, vid 0x%x, curr 0x%x\n", vid,
 245                                 data->currvid);
 246                 return 1;
 247         }
 248
 249         return 0;
 250 }
 251
 252 /*
 253  * Reduce the vid by the max of step or reqvid.
 254  * Decreasing vid codes represent increasing voltages:
 255  * vid of 0 is 1.550V, vid of 0x1e is 0.800V, vid of VID_OFF is off.
 256  */
 257 static int decrease_vid_code_by_step(struct powernow_k8_data *data, u32 reqvid, u32 step)
 258 {
 259         if ((data->currvid - reqvid) > step)
 260                 reqvid = data->currvid - step;
 261
 262         if (write_new_vid(data, reqvid))
 263                 return 1;
 264
 265         count_off_vst(data);
 266
 267         return 0;
 268 }
 269
 270 /* Change hardware pstate by single MSR write */
 271 static int transition_pstate(struct powernow_k8_data *data, u32 pstate)
 272 {
 273         wrmsr(MSR_PSTATE_CTRL, pstate, 0);
 274         data->currpstate = pstate;
 275         return 0;
 276 }
 277
 278 /* Change Opteron/Athlon64 fid and vid, by the 3 phases. */
 279 static int transition_fid_vid(struct powernow_k8_data *data, u32 reqfid, u32 reqvid)
 280 {
 281         if (core_voltage_pre_transition(data, reqvid))
 282                 return 1;
 283
 284         if (core_frequency_transition(data, reqfid))
 285                 return 1;
 286
 287         if (core_voltage_post_transition(data, reqvid))
 288                 return 1;
 289
 290         if (query_current_values_with_pending_wait(data))
 291                 return 1;
 292
 293         if ((reqfid != data->currfid) || (reqvid != data->currvid)) {
 294                 printk(KERN_ERR PFX "failed (cpu%d): req 0x%x 0x%x, curr 0x%x 0x%x\n",
 295                                 smp_processor_id(),
 296                                 reqfid, reqvid, data->currfid, data->currvid);
 297                 return 1;
 298         }
 299
 300         dprintk("transitioned (cpu%d): new fid 0x%x, vid 0x%x\n",
 301                 smp_processor_id(), data->currfid, data->currvid);
 302
 303         return 0;
 304 }
 305
 306 /* Phase 1 - core voltage transition ... setup voltage */
 307 static int core_voltage_pre_transition(struct powernow_k8_data *data, u32 reqvid)
 308 {
 309         u32 rvosteps = data->rvo;
 310         u32 savefid = data->currfid;
 311         u32 maxvid, lo;
 312
 313         dprintk("ph1 (cpu%d): start, currfid 0x%x, currvid 0x%x, reqvid 0x%x, rvo 0x%x\n",
 314                 smp_processor_id(),
 315                 data->currfid, data->currvid, reqvid, data->rvo);
 316
 317         rdmsr(MSR_FIDVID_STATUS, lo, maxvid);
 318         maxvid = 0x1f & (maxvid >> 16);
 319         dprintk("ph1 maxvid=0x%x\n", maxvid);
 320         if (reqvid < maxvid) /* lower numbers are higher voltages */
 321                 reqvid = maxvid;
 322
 323         while (data->currvid > reqvid) {
 324                 dprintk("ph1: curr 0x%x, req vid 0x%x\n",
 325                         data->currvid, reqvid);
 326                 if (decrease_vid_code_by_step(data, reqvid, data->vidmvs))
 327                         return 1;
 328         }
 329
 330         while ((rvosteps > 0) && ((data->rvo + data->currvid) > reqvid)) {
 331                 if (data->currvid == maxvid) {
 332                         rvosteps = 0;
 333                 } else {
 334                         dprintk("ph1: changing vid for rvo, req 0x%x\n",
 335                                 data->currvid - 1);
 336                         if (decrease_vid_code_by_step(data, data->currvid - 1, 1))
 337                                 return 1;
 338                         rvosteps--;
 339                 }
 340         }
 341
 342         if (query_current_values_with_pending_wait(data))
 343                 return 1;
 344
 345         if (savefid != data->currfid) {
 346                 printk(KERN_ERR PFX "ph1 err, currfid changed 0x%x\n", data->currfid);
 347                 return 1;
 348         }
 349
 350         dprintk("ph1 complete, currfid 0x%x, currvid 0x%x\n",
 351                 data->currfid, data->currvid);
 352
 353         return 0;
 354 }
 355
 356 /* Phase 2 - core frequency transition */
 357 static int core_frequency_transition(struct powernow_k8_data *data, u32 reqfid)
 358 {
 359         u32 vcoreqfid, vcocurrfid, vcofiddiff, fid_interval, savevid = data->currvid;
 360
 361         if ((reqfid < HI_FID_TABLE_BOTTOM) && (data->currfid < HI_FID_TABLE_BOTTOM)) {
 362                 printk(KERN_ERR PFX "ph2: illegal lo-lo transition 0x%x 0x%x\n",
 363                         reqfid, data->currfid);
 364                 return 1;
 365         }
 366
 367         if (data->currfid == reqfid) {
 368                 printk(KERN_ERR PFX "ph2 null fid transition 0x%x\n", data->currfid);
 369                 return 0;
 370         }
 371
 372         dprintk("ph2 (cpu%d): starting, currfid 0x%x, currvid 0x%x, reqfid 0x%x\n",
 373                 smp_processor_id(),
 374                 data->currfid, data->currvid, reqfid);
 375
 376         vcoreqfid = convert_fid_to_vco_fid(reqfid);
 377         vcocurrfid = convert_fid_to_vco_fid(data->currfid);
 378         vcofiddiff = vcocurrfid > vcoreqfid ? vcocurrfid - vcoreqfid
 379             : vcoreqfid - vcocurrfid;
 380
 381         while (vcofiddiff > 2) {
 382                 (data->currfid & 1) ? (fid_interval = 1) : (fid_interval = 2);
 383
 384                 if (reqfid > data->currfid) {
 385                         if (data->currfid > LO_FID_TABLE_TOP) {
 386                                 if (write_new_fid(data, data->currfid + fid_interval)) {
 387                                         return 1;
 388                                 }
 389                         } else {
 390                                 if (write_new_fid
 391                                     (data, 2 + convert_fid_to_vco_fid(data->currfid))) {
 392                                         return 1;
 393                                 }
 394                         }
 395                 } else {
 396                         if (write_new_fid(data, data->currfid - fid_interval))
 397                                 return 1;
 398                 }
 399
 400                 vcocurrfid = convert_fid_to_vco_fid(data->currfid);
 401                 vcofiddiff = vcocurrfid > vcoreqfid ? vcocurrfid - vcoreqfid
 402                     : vcoreqfid - vcocurrfid;
 403         }
 404
 405         if (write_new_fid(data, reqfid))
 406                 return 1;
 407
 408         if (query_current_values_with_pending_wait(data))
 409                 return 1;
 410
 411         if (data->currfid != reqfid) {
 412                 printk(KERN_ERR PFX
 413                         "ph2: mismatch, failed fid transition, curr 0x%x, req 0x%x\n",
 414                         data->currfid, reqfid);
 415                 return 1;
 416         }
 417
 418         if (savevid != data->currvid) {
 419                 printk(KERN_ERR PFX "ph2: vid changed, save 0x%x, curr 0x%x\n",
 420                         savevid, data->currvid);
 421                 return 1;
 422         }
 423
 424         dprintk("ph2 complete, currfid 0x%x, currvid 0x%x\n",
 425                 data->currfid, data->currvid);
 426
 427         return 0;
 428 }
 429
 430 /* Phase 3 - core voltage transition flow ... jump to the final vid. */
 431 static int core_voltage_post_transition(struct powernow_k8_data *data, u32 reqvid)
 432 {
 433         u32 savefid = data->currfid;
 434         u32 savereqvid = reqvid;
 435
 436         dprintk("ph3 (cpu%d): starting, currfid 0x%x, currvid 0x%x\n",
 437                 smp_processor_id(),
 438                 data->currfid, data->currvid);
 439
 440         if (reqvid != data->currvid) {
 441                 if (write_new_vid(data, reqvid))
 442                         return 1;
 443
 444                 if (savefid != data->currfid) {
 445                         printk(KERN_ERR PFX
 446                                "ph3: bad fid change, save 0x%x, curr 0x%x\n",
 447                                savefid, data->currfid);
 448                         return 1;
 449                 }
 450
 451                 if (data->currvid != reqvid) {
 452                         printk(KERN_ERR PFX
 453                                "ph3: failed vid transition\n, req 0x%x, curr 0x%x",
 454                                reqvid, data->currvid);
 455                         return 1;
 456                 }
 457         }
 458
 459         if (query_current_values_with_pending_wait(data))
 460                 return 1;
 461
 462         if (savereqvid != data->currvid) {
 463                 dprintk("ph3 failed, currvid 0x%x\n", data->currvid);
 464                 return 1;
 465         }
 466
 467         if (savefid != data->currfid) {
 468                 dprintk("ph3 failed, currfid changed 0x%x\n",
 469                         data->currfid);
 470                 return 1;
 471         }
 472
 473         dprintk("ph3 complete, currfid 0x%x, currvid 0x%x\n",
 474                 data->currfid, data->currvid);
 475
 476         return 0;
 477 }
 478
 479 static int check_supported_cpu(unsigned int cpu)
 480 {
 481         cpumask_t oldmask;
 482         cpumask_of_cpu_ptr(cpu_mask, cpu);
 483         u32 eax, ebx, ecx, edx;
 484         unsigned int rc = 0;
 485
 486         oldmask = current->cpus_allowed;
 487         set_cpus_allowed_ptr(current, cpu_mask);
 488
 489         if (smp_processor_id() != cpu) {
 490                 printk(KERN_ERR PFX "limiting to cpu %u failed\n", cpu);
 491                 goto out;
 492         }
 493
 494         if (current_cpu_data.x86_vendor != X86_VENDOR_AMD)
 495                 goto out;
 496
 497         eax = cpuid_eax(CPUID_PROCESSOR_SIGNATURE);
 498         if (((eax & CPUID_XFAM) != CPUID_XFAM_K8) &&
 499             ((eax & CPUID_XFAM) < CPUID_XFAM_10H))
 500                 goto out;
 501
 502         if ((eax & CPUID_XFAM) == CPUID_XFAM_K8) {
 503                 if (((eax & CPUID_USE_XFAM_XMOD) != CPUID_USE_XFAM_XMOD) ||
 504                     ((eax & CPUID_XMOD) > CPUID_XMOD_REV_MASK)) {
 505                         printk(KERN_INFO PFX "Processor cpuid %x not supported\n", eax);
 506                         goto out;
 507                 }
 508
 509                 eax = cpuid_eax(CPUID_GET_MAX_CAPABILITIES);
 510                 if (eax < CPUID_FREQ_VOLT_CAPABILITIES) {
 511                         printk(KERN_INFO PFX
 512                                "No frequency change capabilities detected\n");
 513                         goto out;
 514                 }
 515
 516                 cpuid(CPUID_FREQ_VOLT_CAPABILITIES, &eax, &ebx, &ecx, &edx);
 517                 if ((edx & P_STATE_TRANSITION_CAPABLE) != P_STATE_TRANSITION_CAPABLE) {
 518                         printk(KERN_INFO PFX "Power state transitions not supported\n");
 519                         goto out;
 520                 }
 521         } else { /* must be a HW Pstate capable processor */
 522                 cpuid(CPUID_FREQ_VOLT_CAPABILITIES, &eax, &ebx, &ecx, &edx);
 523                 if ((edx & USE_HW_PSTATE) == USE_HW_PSTATE)
 524                         cpu_family = CPU_HW_PSTATE;
 525                 else
 526                         goto out;
 527         }
 528
 529         rc = 1;
 530
 531 out:
 532         set_cpus_allowed_ptr(current, &oldmask);
 533         return rc;
 534 }
 535
 536 static int check_pst_table(struct powernow_k8_data *data, struct pst_s *pst, u8 maxvid)
 537 {
 538         unsigned int j;
 539         u8 lastfid = 0xff;
 540
 541         for (j = 0; j < data->numps; j++) {
 542                 if (pst[j].vid > LEAST_VID) {
 543                         printk(KERN_ERR PFX "vid %d invalid : 0x%x\n", j, pst[j].vid);
 544                         return -EINVAL;
 545                 }
 546                 if (pst[j].vid < data->rvo) {   /* vid + rvo >= 0 */
 547                         printk(KERN_ERR BFX "0 vid exceeded with pstate %d\n", j);
 548                         return -ENODEV;
 549                 }
 550                 if (pst[j].vid < maxvid + data->rvo) {  /* vid + rvo >= maxvid */
 551                         printk(KERN_ERR BFX "maxvid exceeded with pstate %d\n", j);
 552                         return -ENODEV;
 553                 }
 554                 if (pst[j].fid > MAX_FID) {
 555                         printk(KERN_ERR BFX "maxfid exceeded with pstate %d\n", j);
 556                         return -ENODEV;
 557                 }
 558                 if (j && (pst[j].fid < HI_FID_TABLE_BOTTOM)) {
 559                         /* Only first fid is allowed to be in "low" range */
 560                         printk(KERN_ERR BFX "two low fids - %d : 0x%x\n", j, pst[j].fid);
 561                         return -EINVAL;
 562                 }
 563                 if (pst[j].fid < lastfid)
 564                         lastfid = pst[j].fid;
 565         }
 566         if (lastfid & 1) {
 567                 printk(KERN_ERR BFX "lastfid invalid\n");
 568                 return -EINVAL;
 569         }
 570         if (lastfid > LO_FID_TABLE_TOP)
 571                 printk(KERN_INFO BFX  "first fid not from lo freq table\n");
 572
 573         return 0;
 574 }
 575
 576 static void print_basics(struct powernow_k8_data *data)
 577 {
 578         int j;
 579         for (j = 0; j < data->numps; j++) {
 580                 if (data->powernow_table[j].frequency != CPUFREQ_ENTRY_INVALID) {
 581                         if (cpu_family == CPU_HW_PSTATE) {
 582                                 printk(KERN_INFO PFX "   %d : pstate %d (%d MHz)\n",
 583                                         j,
 584                                         data->powernow_table[j].index,
 585                                         data->powernow_table[j].frequency/1000);
 586                         } else {
 587                                 printk(KERN_INFO PFX "   %d : fid 0x%x (%d MHz), vid 0x%x\n",
 588                                         j,
 589                                         data->powernow_table[j].index & 0xff,
 590                                         data->powernow_table[j].frequency/1000,
 591                                         data->powernow_table[j].index >> 8);
 592                         }
 593                 }
 594         }
 595         if (data->batps)
 596                 printk(KERN_INFO PFX "Only %d pstates on battery\n", data->batps);
 597 }
 598
 599 static int fill_powernow_table(struct powernow_k8_data *data, struct pst_s *pst, u8 maxvid)
 600 {
 601         struct cpufreq_frequency_table *powernow_table;
 602         unsigned int j;
 603
 604         if (data->batps) {    /* use ACPI support to get full speed on mains power */
 605                 printk(KERN_WARNING PFX "Only %d pstates usable (use ACPI driver for full range\n", data->batps);
 606                 data->numps = data->batps;
 607         }
 608
 609         for ( j=1; j<data->numps; j++ ) {
 610                 if (pst[j-1].fid >= pst[j].fid) {
 611                         printk(KERN_ERR PFX "PST out of sequence\n");
 612                         return -EINVAL;
 613                 }
 614         }
 615
 616         if (data->numps < 2) {
 617                 printk(KERN_ERR PFX "no p states to transition\n");
 618                 return -ENODEV;
 619         }
 620
 621         if (check_pst_table(data, pst, maxvid))
 622                 return -EINVAL;
 623
 624         powernow_table = kmalloc((sizeof(struct cpufreq_frequency_table)
 625                 * (data->numps + 1)), GFP_KERNEL);
 626         if (!powernow_table) {
 627                 printk(KERN_ERR PFX "powernow_table memory alloc failure\n");
 628                 return -ENOMEM;
 629         }
 630
 631         for (j = 0; j < data->numps; j++) {
 632                 powernow_table[j].index = pst[j].fid; /* lower 8 bits */
 633                 powernow_table[j].index |= (pst[j].vid << 8); /* upper 8 bits */
 634                 powernow_table[j].frequency = find_khz_freq_from_fid(pst[j].fid);
 635         }
 636         powernow_table[data->numps].frequency = CPUFREQ_TABLE_END;
 637         powernow_table[data->numps].index = 0;
 638
 639         if (query_current_values_with_pending_wait(data)) {
 640                 kfree(powernow_table);
 641                 return -EIO;
 642         }
 643
 644         dprintk("cfid 0x%x, cvid 0x%x\n", data->currfid, data->currvid);
 645         data->powernow_table = powernow_table;
 646         if (first_cpu(per_cpu(cpu_core_map, data->cpu)) == data->cpu)
 647                 print_basics(data);
 648
 649         for (j = 0; j < data->numps; j++)
 650                 if ((pst[j].fid==data->currfid) && (pst[j].vid==data->currvid))
 651                         return 0;
 652
 653         dprintk("currfid/vid do not match PST, ignoring\n");
 654         return 0;
 655 }
 656
 657 /* Find and validate the PSB/PST table in BIOS. */
 658 static int find_psb_table(struct powernow_k8_data *data)
 659 {
 660         struct psb_s *psb;
 661         unsigned int i;
 662         u32 mvs;
 663         u8 maxvid;
 664         u32 cpst = 0;
 665         u32 thiscpuid;
 666
 667         for (i = 0xc0000; i < 0xffff0; i += 0x10) {
 668                 /* Scan BIOS looking for the signature. */
 669                 /* It can not be at ffff0 - it is too big. */
 670
 671                 psb = phys_to_virt(i);
 672                 if (memcmp(psb, PSB_ID_STRING, PSB_ID_STRING_LEN) != 0)
 673                         continue;
 674
 675                 dprintk("found PSB header at 0x%p\n", psb);
 676
 677                 dprintk("table vers: 0x%x\n", psb->tableversion);
 678                 if (psb->tableversion != PSB_VERSION_1_4) {
 679                         printk(KERN_ERR BFX "PSB table is not v1.4\n");
 680                         return -ENODEV;
 681                 }
 682
 683                 dprintk("flags: 0x%x\n", psb->flags1);
 684                 if (psb->flags1) {
 685                         printk(KERN_ERR BFX "unknown flags\n");
 686                         return -ENODEV;
 687                 }
 688
 689                 data->vstable = psb->vstable;
 690                 dprintk("voltage stabilization time: %d(*20us)\n", data->vstable);
 691
 692                 dprintk("flags2: 0x%x\n", psb->flags2);
 693                 data->rvo = psb->flags2 & 3;
 694                 data->irt = ((psb->flags2) >> 2) & 3;
 695                 mvs = ((psb->flags2) >> 4) & 3;
 696                 data->vidmvs = 1 << mvs;
 697                 data->batps = ((psb->flags2) >> 6) & 3;
 698
 699                 dprintk("ramp voltage offset: %d\n", data->rvo);
 700                 dprintk("isochronous relief time: %d\n", data->irt);
 701                 dprintk("maximum voltage step: %d - 0x%x\n", mvs, data->vidmvs);
 702
 703                 dprintk("numpst: 0x%x\n", psb->num_tables);
 704                 cpst = psb->num_tables;
 705                 if ((psb->cpuid == 0x00000fc0) || (psb->cpuid == 0x00000fe0) ){
 706                         thiscpuid = cpuid_eax(CPUID_PROCESSOR_SIGNATURE);
 707                         if ((thiscpuid == 0x00000fc0) || (thiscpuid == 0x00000fe0) ) {
 708                                 cpst = 1;
 709                         }
 710                 }
 711                 if (cpst != 1) {
 712                         printk(KERN_ERR BFX "numpst must be 1\n");
 713                         return -ENODEV;
 714                 }
 715
 716                 data->plllock = psb->plllocktime;
 717                 dprintk("plllocktime: 0x%x (units 1us)\n", psb->plllocktime);
 718                 dprintk("maxfid: 0x%x\n", psb->maxfid);
 719                 dprintk("maxvid: 0x%x\n", psb->maxvid);
 720                 maxvid = psb->maxvid;
 721
 722                 data->numps = psb->numps;
 723                 dprintk("numpstates: 0x%x\n", data->numps);
 724                 return fill_powernow_table(data, (struct pst_s *)(psb+1), maxvid);
 725         }
 726         /*
 727          * If you see this message, complain to BIOS manufacturer. If
 728          * he tells you "we do not support Linux" or some similar
 729          * nonsense, remember that Windows 2000 uses the same legacy
 730          * mechanism that the old Linux PSB driver uses. Tell them it
 731          * is broken with Windows 2000.
 732          *
 733          * The reference to the AMD documentation is chapter 9 in the
 734          * BIOS and Kernel Developer's Guide, which is available on
 735          * www.amd.com
 736          */
 737         printk(KERN_ERR PFX "BIOS error - no PSB or ACPI _PSS objects\n");
 738         return -ENODEV;
 739 }
 740
 741 #ifdef CONFIG_X86_POWERNOW_K8_ACPI
 742 static void powernow_k8_acpi_pst_values(struct powernow_k8_data *data, unsigned int index)
 743 {
 744         if (!data->acpi_data.state_count || (cpu_family == CPU_HW_PSTATE))
 745                 return;
 746
 747         data->irt = (data->acpi_data.states[index].control >> IRT_SHIFT) & IRT_MASK;
 748         data->rvo = (data->acpi_data.states[index].control >> RVO_SHIFT) & RVO_MASK;
 749         data->exttype = (data->acpi_data.states[index].control >> EXT_TYPE_SHIFT) & EXT_TYPE_MASK;
 750         data->plllock = (data->acpi_data.states[index].control >> PLL_L_SHIFT) & PLL_L_MASK;
 751         data->vidmvs = 1 << ((data->acpi_data.states[index].control >> MVS_SHIFT) & MVS_MASK);
 752         data->vstable = (data->acpi_data.states[index].control >> VST_SHIFT) & VST_MASK;
 753 }
 754
 755 static int powernow_k8_cpu_init_acpi(struct powernow_k8_data *data)
 756 {
 757         struct cpufreq_frequency_table *powernow_table;
 758         int ret_val;
 759
 760         if (acpi_processor_register_performance(&data->acpi_data, data->cpu)) {
 761                 dprintk("register performance failed: bad ACPI data\n");
 762                 return -EIO;
 763         }
 764
 765         /* verify the data contained in the ACPI structures */
 766         if (data->acpi_data.state_count <= 1) {
 767                 dprintk("No ACPI P-States\n");
 768                 goto err_out;
 769         }
 770
 771         if ((data->acpi_data.control_register.space_id != ACPI_ADR_SPACE_FIXED_HARDWARE) ||
 772                 (data->acpi_data.status_register.space_id != ACPI_ADR_SPACE_FIXED_HARDWARE)) {
 773                 dprintk("Invalid control/status registers (%x - %x)\n",
 774                         data->acpi_data.control_register.space_id,
 775                         data->acpi_data.status_register.space_id);
 776                 goto err_out;
 777         }
 778
 779         /* fill in data->powernow_table */
 780         powernow_table = kmalloc((sizeof(struct cpufreq_frequency_table)
 781                 * (data->acpi_data.state_count + 1)), GFP_KERNEL);
 782         if (!powernow_table) {
 783                 dprintk("powernow_table memory alloc failure\n");
 784                 goto err_out;
 785         }
 786
 787         if (cpu_family == CPU_HW_PSTATE)
 788                 ret_val = fill_powernow_table_pstate(data, powernow_table);
 789         else
 790                 ret_val = fill_powernow_table_fidvid(data, powernow_table);
 791         if (ret_val)
 792                 goto err_out_mem;
 793
 794         powernow_table[data->acpi_data.state_count].frequency = CPUFREQ_TABLE_END;
 795         powernow_table[data->acpi_data.state_count].index = 0;
 796         data->powernow_table = powernow_table;
 797
 798         /* fill in data */
 799         data->numps = data->acpi_data.state_count;
 800         if (first_cpu(per_cpu(cpu_core_map, data->cpu)) == data->cpu)
 801                 print_basics(data);
 802         powernow_k8_acpi_pst_values(data, 0);
 803
 804         /* notify BIOS that we exist */
 805         acpi_processor_notify_smm(THIS_MODULE);
 806
 807         return 0;
 808
 809 err_out_mem:
 810         kfree(powernow_table);
 811
 812 err_out:
 813         acpi_processor_unregister_performance(&data->acpi_data, data->cpu);
 814
 815         /* data->acpi_data.state_count informs us at ->exit() whether ACPI was used */
 816         data->acpi_data.state_count = 0;
 817
 818         return -ENODEV;
 819 }
 820
 821 static int fill_powernow_table_pstate(struct powernow_k8_data *data, struct cpufreq_frequency_table *powernow_table)
 822 {
 823         int i;
 824         u32 hi = 0, lo = 0;
 825         rdmsr(MSR_PSTATE_CUR_LIMIT, hi, lo);
 826         data->max_hw_pstate = (hi & HW_PSTATE_MAX_MASK) >> HW_PSTATE_MAX_SHIFT;
 827
 828         for (i = 0; i < data->acpi_data.state_count; i++) {
 829                 u32 index;
 830
 831                 index = data->acpi_data.states[i].control & HW_PSTATE_MASK;
 832                 if (index > data->max_hw_pstate) {
 833                         printk(KERN_ERR PFX "invalid pstate %d - bad value %d.\n", i, index);
 834                         printk(KERN_ERR PFX "Please report to BIOS manufacturer\n");
 835                         powernow_table[i].frequency = CPUFREQ_ENTRY_INVALID;
 836                         continue;
 837                 }
 838                 rdmsr(MSR_PSTATE_DEF_BASE + index, lo, hi);
 839                 if (!(hi & HW_PSTATE_VALID_MASK)) {
 840                         dprintk("invalid pstate %d, ignoring\n", index);
 841                         powernow_table[i].frequency = CPUFREQ_ENTRY_INVALID;
 842                         continue;
 843                 }
 844
 845                 powernow_table[i].index = index;
 846
 847                 powernow_table[i].frequency = data->acpi_data.states[i].core_frequency * 1000;
 848         }
 849         return 0;
 850 }
 851
 852 static int fill_powernow_table_fidvid(struct powernow_k8_data *data, struct cpufreq_frequency_table *powernow_table)
 853 {
 854         int i;
 855         int cntlofreq = 0;
 856         for (i = 0; i < data->acpi_data.state_count; i++) {
 857                 u32 fid;
 858                 u32 vid;
 859
 860                 if (data->exttype) {
 861                         fid = data->acpi_data.states[i].status & EXT_FID_MASK;
 862                         vid = (data->acpi_data.states[i].status >> VID_SHIFT) & EXT_VID_MASK;
 863                 } else {
 864                         fid = data->acpi_data.states[i].control & FID_MASK;
 865                         vid = (data->acpi_data.states[i].control >> VID_SHIFT) & VID_MASK;
 866                 }
 867
 868                 dprintk("   %d : fid 0x%x, vid 0x%x\n", i, fid, vid);
 869
 870                 powernow_table[i].index = fid; /* lower 8 bits */
 871                 powernow_table[i].index |= (vid << 8); /* upper 8 bits */
 872                 powernow_table[i].frequency = find_khz_freq_from_fid(fid);
 873
 874                 /* verify frequency is OK */
 875                 if ((powernow_table[i].frequency > (MAX_FREQ * 1000)) ||
 876                         (powernow_table[i].frequency < (MIN_FREQ * 1000))) {
 877                         dprintk("invalid freq %u kHz, ignoring\n", powernow_table[i].frequency);
 878                         powernow_table[i].frequency = CPUFREQ_ENTRY_INVALID;
 879                         continue;
 880                 }
 881
 882                 /* verify voltage is OK - BIOSs are using "off" to indicate invalid */
 883                 if (vid == VID_OFF) {
 884                         dprintk("invalid vid %u, ignoring\n", vid);
 885                         powernow_table[i].frequency = CPUFREQ_ENTRY_INVALID;
 886                         continue;
 887                 }
 888
 889                 /* verify only 1 entry from the lo frequency table */
 890                 if (fid < HI_FID_TABLE_BOTTOM) {
 891                         if (cntlofreq) {
 892                                 /* if both entries are the same, ignore this one ... */
 893                                 if ((powernow_table[i].frequency != powernow_table[cntlofreq].frequency) ||
 894                                     (powernow_table[i].index != powernow_table[cntlofreq].index)) {
 895                                         printk(KERN_ERR PFX "Too many lo freq table entries\n");
 896                                         return 1;
 897                                 }
 898
 899                                 dprintk("double low frequency table entry, ignoring it.\n");
 900                                 powernow_table[i].frequency = CPUFREQ_ENTRY_INVALID;
 901                                 continue;
 902                         } else
 903                                 cntlofreq = i;
 904                 }
 905
 906                 if (powernow_table[i].frequency != (data->acpi_data.states[i].core_frequency * 1000)) {
 907                         printk(KERN_INFO PFX "invalid freq entries %u kHz vs. %u kHz\n",
 908                                 powernow_table[i].frequency,
 909                                 (unsigned int) (data->acpi_data.states[i].core_frequency * 1000));
 910                         powernow_table[i].frequency = CPUFREQ_ENTRY_INVALID;
 911                         continue;
 912                 }
 913         }
 914         return 0;
 915 }
 916
 917 static void powernow_k8_cpu_exit_acpi(struct powernow_k8_data *data)
 918 {
 919         if (data->acpi_data.state_count)
 920                 acpi_processor_unregister_performance(&data->acpi_data, data->cpu);
 921 }
 922
 923 #else
 924 static int powernow_k8_cpu_init_acpi(struct powernow_k8_data *data) { return -ENODEV; }
 925 static void powernow_k8_cpu_exit_acpi(struct powernow_k8_data *data) { return; }
 926 static void powernow_k8_acpi_pst_values(struct powernow_k8_data *data, unsigned int index) { return; }
 927 #endif /* CONFIG_X86_POWERNOW_K8_ACPI */
 928
 929 /* Take a frequency, and issue the fid/vid transition command */
 930 static int transition_frequency_fidvid(struct powernow_k8_data *data, unsigned int index)
 931 {
 932         u32 fid = 0;
 933         u32 vid = 0;
 934         int res, i;
 935         struct cpufreq_freqs freqs;
 936
 937         dprintk("cpu %d transition to index %u\n", smp_processor_id(), index);
 938
 939         /* fid/vid correctness check for k8 */
 940         /* fid are the lower 8 bits of the index we stored into
 941          * the cpufreq frequency table in find_psb_table, vid
 942          * are the upper 8 bits.
 943          */
 944         fid = data->powernow_table[index].index & 0xFF;
 945         vid = (data->powernow_table[index].index & 0xFF00) >> 8;
 946
 947         dprintk("table matched fid 0x%x, giving vid 0x%x\n", fid, vid);
 948
 949         if (query_current_values_with_pending_wait(data))
 950                 return 1;
 951
 952         if ((data->currvid == vid) && (data->currfid == fid)) {
 953                 dprintk("target matches current values (fid 0x%x, vid 0x%x)\n",
 954                         fid, vid);
 955                 return 0;
 956         }
 957
 958         if ((fid < HI_FID_TABLE_BOTTOM) && (data->currfid < HI_FID_TABLE_BOTTOM)) {
 959                 printk(KERN_ERR PFX
 960                        "ignoring illegal change in lo freq table-%x to 0x%x\n",
 961                        data->currfid, fid);
 962                 return 1;
 963         }
 964
 965         dprintk("cpu %d, changing to fid 0x%x, vid 0x%x\n",
 966                 smp_processor_id(), fid, vid);
 967         freqs.old = find_khz_freq_from_fid(data->currfid);
 968         freqs.new = find_khz_freq_from_fid(fid);
 969
 970         for_each_cpu_mask_nr(i, *(data->available_cores)) {
 971                 freqs.cpu = i;
 972                 cpufreq_notify_transition(&freqs, CPUFREQ_PRECHANGE);
 973         }
 974
 975         res = transition_fid_vid(data, fid, vid);
 976         freqs.new = find_khz_freq_from_fid(data->currfid);
 977
 978         for_each_cpu_mask_nr(i, *(data->available_cores)) {
 979                 freqs.cpu = i;
 980                 cpufreq_notify_transition(&freqs, CPUFREQ_POSTCHANGE);
 981         }
 982         return res;
 983 }
 984
 985 /* Take a frequency, and issue the hardware pstate transition command */
 986 static int transition_frequency_pstate(struct powernow_k8_data *data, unsigned int index)
 987 {
 988         u32 pstate = 0;
 989         int res, i;
 990         struct cpufreq_freqs freqs;
 991
 992         dprintk("cpu %d transition to index %u\n", smp_processor_id(), index);
 993
 994         /* get MSR index for hardware pstate transition */
 995         pstate = index & HW_PSTATE_MASK;
 996         if (pstate > data->max_hw_pstate)
 997                 return 0;
 998         freqs.old = find_khz_freq_from_pstate(data->powernow_table, data->currpstate);
 999         freqs.new = find_khz_freq_from_pstate(data->powernow_table, pstate);
1000
1001         for_each_cpu_mask_nr(i, *(data->available_cores)) {
1002                 freqs.cpu = i;
1003                 cpufreq_notify_transition(&freqs, CPUFREQ_PRECHANGE);
1004         }
1005
1006         res = transition_pstate(data, pstate);
1007         freqs.new = find_khz_freq_from_pstate(data->powernow_table, pstate);
1008
1009         for_each_cpu_mask_nr(i, *(data->available_cores)) {
1010                 freqs.cpu = i;
1011                 cpufreq_notify_transition(&freqs, CPUFREQ_POSTCHANGE);
1012         }
1013         return res;
1014 }
1015
1016 /* Driver entry point to switch to the target frequency */
1017 static int powernowk8_target(struct cpufreq_policy *pol, unsigned targfreq, unsigned relation)
1018 {
1019         cpumask_t oldmask;
1020         cpumask_of_cpu_ptr(cpu_mask, pol->cpu);
1021         struct powernow_k8_data *data = per_cpu(powernow_data, pol->cpu);
1022         u32 checkfid;
1023         u32 checkvid;
1024         unsigned int newstate;
1025         int ret = -EIO;
1026
1027         if (!data)
1028                 return -EINVAL;
1029
1030         checkfid = data->currfid;
1031         checkvid = data->currvid;
1032
1033         /* only run on specific CPU from here on */
1034         oldmask = current->cpus_allowed;
1035         set_cpus_allowed_ptr(current, cpu_mask);
1036
1037         if (smp_processor_id() != pol->cpu) {
1038                 printk(KERN_ERR PFX "limiting to cpu %u failed\n", pol->cpu);
1039                 goto err_out;
1040         }
1041
1042         if (pending_bit_stuck()) {
1043                 printk(KERN_ERR PFX "failing targ, change pending bit set\n");
1044                 goto err_out;
1045         }
1046
1047         dprintk("targ: cpu %d, %d kHz, min %d, max %d, relation %d\n",
1048                 pol->cpu, targfreq, pol->min, pol->max, relation);
1049
1050         if (query_current_values_with_pending_wait(data))
1051                 goto err_out;
1052
1053         if (cpu_family != CPU_HW_PSTATE) {
1054                 dprintk("targ: curr fid 0x%x, vid 0x%x\n",
1055                 data->currfid, data->currvid);
1056
1057                 if ((checkvid != data->currvid) || (checkfid != data->currfid)) {
1058                         printk(KERN_INFO PFX
1059                                 "error - out of sync, fix 0x%x 0x%x, vid 0x%x 0x%x\n",
1060                                 checkfid, data->currfid, checkvid, data->currvid);
1061                 }
1062         }
1063
1064         if (cpufreq_frequency_table_target(pol, data->powernow_table, targfreq, relation, &newstate))
1065                 goto err_out;
1066
1067         mutex_lock(&fidvid_mutex);
1068
1069         powernow_k8_acpi_pst_values(data, newstate);
1070
1071         if (cpu_family == CPU_HW_PSTATE)
1072                 ret = transition_frequency_pstate(data, newstate);
1073         else
1074                 ret = transition_frequency_fidvid(data, newstate);
1075         if (ret) {
1076                 printk(KERN_ERR PFX "transition frequency failed\n");
1077                 ret = 1;
1078                 mutex_unlock(&fidvid_mutex);
1079                 goto err_out;
1080         }
1081         mutex_unlock(&fidvid_mutex);
1082
1083         if (cpu_family == CPU_HW_PSTATE)
1084                 pol->cur = find_khz_freq_from_pstate(data->powernow_table, newstate);
1085         else
1086                 pol->cur = find_khz_freq_from_fid(data->currfid);
1087         ret = 0;
1088
1089 err_out:
1090         set_cpus_allowed_ptr(current, &oldmask);
1091         return ret;
1092 }
1093
1094 /* Driver entry point to verify the policy and range of frequencies */
1095 static int powernowk8_verify(struct cpufreq_policy *pol)
1096 {
1097         struct powernow_k8_data *data = per_cpu(powernow_data, pol->cpu);
1098
1099         if (!data)
1100                 return -EINVAL;
1101
1102         return cpufreq_frequency_table_verify(pol, data->powernow_table);
1103 }
1104
1105 /* per CPU init entry point to the driver */
1106 static int __cpuinit powernowk8_cpu_init(struct cpufreq_policy *pol)
1107 {
1108         struct powernow_k8_data *data;
1109         cpumask_t oldmask;
1110         cpumask_of_cpu_ptr_declare(newmask);
1111         int rc;
1112
1113         if (!cpu_online(pol->cpu))
1114                 return -ENODEV;
1115
1116         if (!check_supported_cpu(pol->cpu))
1117                 return -ENODEV;
1118
1119         data = kzalloc(sizeof(struct powernow_k8_data), GFP_KERNEL);
1120         if (!data) {
1121                 printk(KERN_ERR PFX "unable to alloc powernow_k8_data");
1122                 return -ENOMEM;
1123         }
1124
1125         data->cpu = pol->cpu;
1126
1127         if (powernow_k8_cpu_init_acpi(data)) {
1128                 /*
1129                  * Use the PSB BIOS structure. This is only availabe on
1130                  * an UP version, and is deprecated by AMD.
1131                  */
1132                 if (num_online_cpus() != 1) {
1133 #ifndef CONFIG_ACPI_PROCESSOR
1134                         printk(KERN_ERR PFX "ACPI Processor support is required "
1135                                "for SMP systems but is absent. Please load the "
1136                                "ACPI Processor module before starting this "
1137                                "driver.\n");
1138 #else
1139                         printk(KERN_ERR PFX "Your BIOS does not provide ACPI "
1140                                "_PSS objects in a way that Linux understands. "
1141                                "Please report this to the Linux ACPI maintainers"
1142                                " and complain to your BIOS vendor.\n");
1143 #endif
1144                         kfree(data);
1145                         return -ENODEV;
1146                 }
1147                 if (pol->cpu != 0) {
1148                         printk(KERN_ERR PFX "No ACPI _PSS objects for CPU other than "
1149                                "CPU0. Complain to your BIOS vendor.\n");
1150                         kfree(data);
1151                         return -ENODEV;
1152                 }
1153                 rc = find_psb_table(data);
1154                 if (rc) {
1155                         kfree(data);
1156                         return -ENODEV;
1157                 }
1158         }
1159
1160         /* only run on specific CPU from here on */
1161         oldmask = current->cpus_allowed;
1162         cpumask_of_cpu_ptr_next(newmask, pol->cpu);
1163         set_cpus_allowed_ptr(current, newmask);
1164
1165         if (smp_processor_id() != pol->cpu) {
1166                 printk(KERN_ERR PFX "limiting to cpu %u failed\n", pol->cpu);
1167                 goto err_out;
1168         }
1169
1170         if (pending_bit_stuck()) {
1171                 printk(KERN_ERR PFX "failing init, change pending bit set\n");
1172                 goto err_out;
1173         }
1174
1175         if (query_current_values_with_pending_wait(data))
1176                 goto err_out;
1177
1178         if (cpu_family == CPU_OPTERON)
1179                 fidvid_msr_init();
1180
1181         /* run on any CPU again */
1182         set_cpus_allowed_ptr(current, &oldmask);
1183
1184         if (cpu_family == CPU_HW_PSTATE)
1185                 pol->cpus = *newmask;
1186         else
1187                 pol->cpus = per_cpu(cpu_core_map, pol->cpu);
1188         data->available_cores = &(pol->cpus);
1189
1190         /* Take a crude guess here.
1191          * That guess was in microseconds, so multiply with 1000 */
1192         pol->cpuinfo.transition_latency = (((data->rvo + 8) * data->vstable * VST_UNITS_20US)
1193             + (3 * (1 << data->irt) * 10)) * 1000;
1194
1195         if (cpu_family == CPU_HW_PSTATE)
1196                 pol->cur = find_khz_freq_from_pstate(data->powernow_table, data->currpstate);
1197         else
1198                 pol->cur = find_khz_freq_from_fid(data->currfid);
1199         dprintk("policy current frequency %d kHz\n", pol->cur);
1200
1201         /* min/max the cpu is capable of */
1202         if (cpufreq_frequency_table_cpuinfo(pol, data->powernow_table)) {
1203                 printk(KERN_ERR PFX "invalid powernow_table\n");
1204                 powernow_k8_cpu_exit_acpi(data);
1205                 kfree(data->powernow_table);
1206                 kfree(data);
1207                 return -EINVAL;
1208         }
1209
1210         cpufreq_frequency_table_get_attr(data->powernow_table, pol->cpu);
1211
1212         if (cpu_family == CPU_HW_PSTATE)
1213                 dprintk("cpu_init done, current pstate 0x%x\n", data->currpstate);
1214         else
1215                 dprintk("cpu_init done, current fid 0x%x, vid 0x%x\n",
1216                         data->currfid, data->currvid);
1217
1218         per_cpu(powernow_data, pol->cpu) = data;
1219
1220         return 0;
1221
1222 err_out:
1223         set_cpus_allowed_ptr(current, &oldmask);
1224         powernow_k8_cpu_exit_acpi(data);
1225
1226         kfree(data);
1227         return -ENODEV;
1228 }
1229
1230 static int __devexit powernowk8_cpu_exit (struct cpufreq_policy *pol)
1231 {
1232         struct powernow_k8_data *data = per_cpu(powernow_data, pol->cpu);
1233
1234         if (!data)
1235                 return -EINVAL;
1236
1237         powernow_k8_cpu_exit_acpi(data);
1238
1239         cpufreq_frequency_table_put_attr(pol->cpu);
1240
1241         kfree(data->powernow_table);
1242         kfree(data);
1243
1244         return 0;
1245 }
1246
1247 static unsigned int powernowk8_get (unsigned int cpu)
1248 {
1249         struct powernow_k8_data *data;
1250         cpumask_t oldmask = current->cpus_allowed;
1251         cpumask_of_cpu_ptr(newmask, cpu);
1252         unsigned int khz = 0;
1253         unsigned int first;
1254
1255         first = first_cpu(per_cpu(cpu_core_map, cpu));
1256         data = per_cpu(powernow_data, first);
1257
1258         if (!data)
1259                 return -EINVAL;
1260
1261         set_cpus_allowed_ptr(current, newmask);
1262         if (smp_processor_id() != cpu) {
1263                 printk(KERN_ERR PFX
1264                         "limiting to CPU %d failed in powernowk8_get\n", cpu);
1265                 set_cpus_allowed_ptr(current, &oldmask);
1266                 return 0;
1267         }
1268
1269         if (query_current_values_with_pending_wait(data))
1270                 goto out;
1271
1272         if (cpu_family == CPU_HW_PSTATE)
1273                 khz = find_khz_freq_from_pstate(data->powernow_table,
1274                                                 data->currpstate);
1275         else
1276                 khz = find_khz_freq_from_fid(data->currfid);
1277
1278
1279 out:
1280         set_cpus_allowed_ptr(current, &oldmask);
1281         return khz;
1282 }
1283
1284 static struct freq_attr* powernow_k8_attr[] = {
1285         &cpufreq_freq_attr_scaling_available_freqs,
1286         NULL,
1287 };
1288
1289 static struct cpufreq_driver cpufreq_amd64_driver = {
1290         .verify = powernowk8_verify,
1291         .target = powernowk8_target,
1292         .init = powernowk8_cpu_init,
1293         .exit = __devexit_p(powernowk8_cpu_exit),
1294         .get = powernowk8_get,
1295         .name = "powernow-k8",
1296         .owner = THIS_MODULE,
1297         .attr = powernow_k8_attr,
1298 };
1299
1300 /* driver entry point for init */
1301 static int __cpuinit powernowk8_init(void)
1302 {
1303         unsigned int i, supported_cpus = 0;
1304
1305         for_each_online_cpu(i) {
1306                 if (check_supported_cpu(i))
1307                         supported_cpus++;
1308         }
1309
1310         if (supported_cpus == num_online_cpus()) {
1311                 printk(KERN_INFO PFX "Found %d %s "
1312                         "processors (%d cpu cores) (" VERSION ")\n",
1313                         num_online_nodes(),
1314                         boot_cpu_data.x86_model_id, supported_cpus);
1315                 return cpufreq_register_driver(&cpufreq_amd64_driver);
1316         }
1317
1318         return -ENODEV;
1319 }
1320
1321 /* driver entry point for term */
1322 static void __exit powernowk8_exit(void)
1323 {
1324         dprintk("exit\n");
1325
1326         cpufreq_unregister_driver(&cpufreq_amd64_driver);
1327 }
1328
1329 MODULE_AUTHOR("Paul Devriendt <paul.devriendt@amd.com> and Mark Langsdorf <mark.langsdorf@amd.com>");
1330 MODULE_DESCRIPTION("AMD Athlon 64 and Opteron processor frequency driver.");
1331 MODULE_LICENSE("GPL");
1332
1333 late_initcall(powernowk8_init);
1334 module_exit(powernowk8_exit);