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

   1 /*
   2  *   (c) 2003-2006 Advanced Micro Devices, Inc.
   3  *  Your use of this code is subject to the terms and conditions of the
   4  *  GNU general public license version 2. See "COPYING" or
   5  *  http://www.gnu.org/licenses/gpl.html
   6  *
   7  *  Support : mark.langsdorf@amd.com
   8  *
   9  *  Based on the powernow-k7.c module written by Dave Jones.
  10  *  (C) 2003 Dave Jones on behalf of SuSE Labs
  11  *  (C) 2004 Dominik Brodowski <linux@brodo.de>
  12  *  (C) 2004 Pavel Machek <pavel@suse.cz>
  13  *  Licensed under the terms of the GNU GPL License version 2.
  14  *  Based upon datasheets & sample CPUs kindly provided by AMD.
  15  *
  16  *  Valuable input gratefully received from Dave Jones, Pavel Machek,
  17  *  Dominik Brodowski, Jacob Shin, and others.
  18  *  Originally developed by Paul Devriendt.
  19  *  Processor information obtained from Chapter 9 (Power and Thermal Management)
  20  *  of the "BIOS and Kernel Developer's Guide for the AMD Athlon 64 and AMD
  21  *  Opteron Processors" available for download from www.amd.com
  22  *
  23  *  Tables for specific CPUs can be inferred from
  24  *     http://www.amd.com/us-en/assets/content_type/white_papers_and_tech_docs/30430.pdf
  25  */
  26
  27 #include <linux/kernel.h>
  28 #include <linux/smp.h>
  29 #include <linux/module.h>
  30 #include <linux/init.h>
  31 #include <linux/cpufreq.h>
  32 #include <linux/slab.h>
  33 #include <linux/string.h>
  34 #include <linux/cpumask.h>
  35 #include <linux/sched.h>        /* for current / set_cpus_allowed() */
  36
  37 #include <asm/msr.h>
  38 #include <asm/io.h>
  39 #include <asm/delay.h>
  40
  41 #ifdef CONFIG_X86_POWERNOW_K8_ACPI
  42 #include <linux/acpi.h>
  43 #include <linux/mutex.h>
  44 #include <acpi/processor.h>
  45 #endif
  46
  47 #define PFX "powernow-k8: "
  48 #define VERSION "version 2.20.00"
  49 #include "powernow-k8.h"
  50
  51 /* serialize freq changes  */
  52 static DEFINE_MUTEX(fidvid_mutex);
  53
  54 static DEFINE_PER_CPU(struct powernow_k8_data *, powernow_data);
  55
  56 static int cpu_family = CPU_OPTERON;
  57
  58 #ifndef CONFIG_SMP
  59 static inline const struct cpumask *cpu_core_mask(int cpu)
  60 {
  61         return cpumask_of(0);
  62 }
  63 #endif
  64
  65 /* Return a frequency in MHz, given an input fid */
  66 static u32 find_freq_from_fid(u32 fid)
  67 {
  68         return 800 + (fid * 100);
  69 }
  70
  71 /* Return a frequency in KHz, given an input fid */
  72 static u32 find_khz_freq_from_fid(u32 fid)
  73 {
  74         return 1000 * find_freq_from_fid(fid);
  75 }
  76
  77 static u32 find_khz_freq_from_pstate(struct cpufreq_frequency_table *data, u32 pstate)
  78 {
  79         return data[pstate].frequency;
  80 }
  81
  82 /* Return the vco fid for an input fid
  83  *
  84  * Each "low" fid has corresponding "high" fid, and you can get to "low" fids
  85  * only from corresponding high fids. This returns "high" fid corresponding to
  86  * "low" one.
  87  */
  88 static u32 convert_fid_to_vco_fid(u32 fid)
  89 {
  90         if (fid < HI_FID_TABLE_BOTTOM)
  91                 return 8 + (2 * fid);
  92         else
  93                 return fid;
  94 }
  95
  96 /*
  97  * Return 1 if the pending bit is set. Unless we just instructed the processor
  98  * to transition to a new state, seeing this bit set is really bad news.
  99  */
 100 static int pending_bit_stuck(void)
 101 {
 102         u32 lo, hi;
 103
 104         if (cpu_family == CPU_HW_PSTATE)
 105                 return 0;
 106
 107         rdmsr(MSR_FIDVID_STATUS, lo, hi);
 108         return lo & MSR_S_LO_CHANGE_PENDING ? 1 : 0;
 109 }
 110
 111 /*
 112  * Update the global current fid / vid values from the status msr.
 113  * Returns 1 on error.
 114  */
 115 static int query_current_values_with_pending_wait(struct powernow_k8_data *data)
 116 {
 117         u32 lo, hi;
 118         u32 i = 0;
 119
 120         if (cpu_family == CPU_HW_PSTATE) {
 121                 if (data->currpstate == HW_PSTATE_INVALID) {
 122                         /* read (initial) hw pstate if not yet set */
 123                         rdmsr(MSR_PSTATE_STATUS, lo, hi);
 124                         i = lo & HW_PSTATE_MASK;
 125
 126                         /*
 127                          * a workaround for family 11h erratum 311 might cause
 128                          * an "out-of-range Pstate if the core is in Pstate-0
 129                          */
 130                         if (i >= data->numps)
 131                                 data->currpstate = HW_PSTATE_0;
 132                         else
 133                                 data->currpstate = i;
 134                 }
 135                 return 0;
 136         }
 137         do {
 138                 if (i++ > 10000) {
 139                         dprintk("detected change pending stuck\n");
 140                         return 1;
 141                 }
 142                 rdmsr(MSR_FIDVID_STATUS, lo, hi);
 143         } while (lo & MSR_S_LO_CHANGE_PENDING);
 144
 145         data->currvid = hi & MSR_S_HI_CURRENT_VID;
 146         data->currfid = lo & MSR_S_LO_CURRENT_FID;
 147
 148         return 0;
 149 }
 150
 151 /* the isochronous relief time */
 152 static void count_off_irt(struct powernow_k8_data *data)
 153 {
 154         udelay((1 << data->irt) * 10);
 155         return;
 156 }
 157
 158 /* the voltage stabilization time */
 159 static void count_off_vst(struct powernow_k8_data *data)
 160 {
 161         udelay(data->vstable * VST_UNITS_20US);
 162         return;
 163 }
 164
 165 /* need to init the control msr to a safe value (for each cpu) */
 166 static void fidvid_msr_init(void)
 167 {
 168         u32 lo, hi;
 169         u8 fid, vid;
 170
 171         rdmsr(MSR_FIDVID_STATUS, lo, hi);
 172         vid = hi & MSR_S_HI_CURRENT_VID;
 173         fid = lo & MSR_S_LO_CURRENT_FID;
 174         lo = fid | (vid << MSR_C_LO_VID_SHIFT);
 175         hi = MSR_C_HI_STP_GNT_BENIGN;
 176         dprintk("cpu%d, init lo 0x%x, hi 0x%x\n", smp_processor_id(), lo, hi);
 177         wrmsr(MSR_FIDVID_CTL, lo, hi);
 178 }
 179
 180 /* write the new fid value along with the other control fields to the msr */
 181 static int write_new_fid(struct powernow_k8_data *data, u32 fid)
 182 {
 183         u32 lo;
 184         u32 savevid = data->currvid;
 185         u32 i = 0;
 186
 187         if ((fid & INVALID_FID_MASK) || (data->currvid & INVALID_VID_MASK)) {
 188                 printk(KERN_ERR PFX "internal error - overflow on fid write\n");
 189                 return 1;
 190         }
 191
 192         lo = fid | (data->currvid << MSR_C_LO_VID_SHIFT) | MSR_C_LO_INIT_FID_VID;
 193
 194         dprintk("writing fid 0x%x, lo 0x%x, hi 0x%x\n",
 195                 fid, lo, data->plllock * PLL_LOCK_CONVERSION);
 196
 197         do {
 198                 wrmsr(MSR_FIDVID_CTL, lo, data->plllock * PLL_LOCK_CONVERSION);
 199                 if (i++ > 100) {
 200                         printk(KERN_ERR PFX "Hardware error - pending bit very stuck - no further pstate changes possible\n");
 201                         return 1;
 202                 }
 203         } while (query_current_values_with_pending_wait(data));
 204
 205         count_off_irt(data);
 206
 207         if (savevid != data->currvid) {
 208                 printk(KERN_ERR PFX "vid change on fid trans, old 0x%x, new 0x%x\n",
 209                        savevid, data->currvid);
 210                 return 1;
 211         }
 212
 213         if (fid != data->currfid) {
 214                 printk(KERN_ERR PFX "fid trans failed, fid 0x%x, curr 0x%x\n", fid,
 215                         data->currfid);
 216                 return 1;
 217         }
 218
 219         return 0;
 220 }
 221
 222 /* Write a new vid to the hardware */
 223 static int write_new_vid(struct powernow_k8_data *data, u32 vid)
 224 {
 225         u32 lo;
 226         u32 savefid = data->currfid;
 227         int i = 0;
 228
 229         if ((data->currfid & INVALID_FID_MASK) || (vid & INVALID_VID_MASK)) {
 230                 printk(KERN_ERR PFX "internal error - overflow on vid write\n");
 231                 return 1;
 232         }
 233
 234         lo = data->currfid | (vid << MSR_C_LO_VID_SHIFT) | MSR_C_LO_INIT_FID_VID;
 235
 236         dprintk("writing vid 0x%x, lo 0x%x, hi 0x%x\n",
 237                 vid, lo, STOP_GRANT_5NS);
 238
 239         do {
 240                 wrmsr(MSR_FIDVID_CTL, lo, STOP_GRANT_5NS);
 241                 if (i++ > 100) {
 242                         printk(KERN_ERR PFX "internal error - pending bit very stuck - no further pstate changes possible\n");
 243                         return 1;
 244                 }
 245         } while (query_current_values_with_pending_wait(data));
 246
 247         if (savefid != data->currfid) {
 248                 printk(KERN_ERR PFX "fid changed on vid trans, old 0x%x new 0x%x\n",
 249                        savefid, data->currfid);
 250                 return 1;
 251         }
 252
 253         if (vid != data->currvid) {
 254                 printk(KERN_ERR PFX "vid trans failed, vid 0x%x, curr 0x%x\n", vid,
 255                                 data->currvid);
 256                 return 1;
 257         }
 258
 259         return 0;
 260 }
 261
 262 /*
 263  * Reduce the vid by the max of step or reqvid.
 264  * Decreasing vid codes represent increasing voltages:
 265  * vid of 0 is 1.550V, vid of 0x1e is 0.800V, vid of VID_OFF is off.
 266  */
 267 static int decrease_vid_code_by_step(struct powernow_k8_data *data, u32 reqvid, u32 step)
 268 {
 269         if ((data->currvid - reqvid) > step)
 270                 reqvid = data->currvid - step;
 271
 272         if (write_new_vid(data, reqvid))
 273                 return 1;
 274
 275         count_off_vst(data);
 276
 277         return 0;
 278 }
 279
 280 /* Change hardware pstate by single MSR write */
 281 static int transition_pstate(struct powernow_k8_data *data, u32 pstate)
 282 {
 283         wrmsr(MSR_PSTATE_CTRL, pstate, 0);
 284         data->currpstate = pstate;
 285         return 0;
 286 }
 287
 288 /* Change Opteron/Athlon64 fid and vid, by the 3 phases. */
 289 static int transition_fid_vid(struct powernow_k8_data *data, u32 reqfid, u32 reqvid)
 290 {
 291         if (core_voltage_pre_transition(data, reqvid))
 292                 return 1;
 293
 294         if (core_frequency_transition(data, reqfid))
 295                 return 1;
 296
 297         if (core_voltage_post_transition(data, reqvid))
 298                 return 1;
 299
 300         if (query_current_values_with_pending_wait(data))
 301                 return 1;
 302
 303         if ((reqfid != data->currfid) || (reqvid != data->currvid)) {
 304                 printk(KERN_ERR PFX "failed (cpu%d): req 0x%x 0x%x, curr 0x%x 0x%x\n",
 305                                 smp_processor_id(),
 306                                 reqfid, reqvid, data->currfid, data->currvid);
 307                 return 1;
 308         }
 309
 310         dprintk("transitioned (cpu%d): new fid 0x%x, vid 0x%x\n",
 311                 smp_processor_id(), data->currfid, data->currvid);
 312
 313         return 0;
 314 }
 315
 316 /* Phase 1 - core voltage transition ... setup voltage */
 317 static int core_voltage_pre_transition(struct powernow_k8_data *data, u32 reqvid)
 318 {
 319         u32 rvosteps = data->rvo;
 320         u32 savefid = data->currfid;
 321         u32 maxvid, lo;
 322
 323         dprintk("ph1 (cpu%d): start, currfid 0x%x, currvid 0x%x, reqvid 0x%x, rvo 0x%x\n",
 324                 smp_processor_id(),
 325                 data->currfid, data->currvid, reqvid, data->rvo);
 326
 327         rdmsr(MSR_FIDVID_STATUS, lo, maxvid);
 328         maxvid = 0x1f & (maxvid >> 16);
 329         dprintk("ph1 maxvid=0x%x\n", maxvid);
 330         if (reqvid < maxvid) /* lower numbers are higher voltages */
 331                 reqvid = maxvid;
 332
 333         while (data->currvid > reqvid) {
 334                 dprintk("ph1: curr 0x%x, req vid 0x%x\n",
 335                         data->currvid, reqvid);
 336                 if (decrease_vid_code_by_step(data, reqvid, data->vidmvs))
 337                         return 1;
 338         }
 339
 340         while ((rvosteps > 0) && ((data->rvo + data->currvid) > reqvid)) {
 341                 if (data->currvid == maxvid) {
 342                         rvosteps = 0;
 343                 } else {
 344                         dprintk("ph1: changing vid for rvo, req 0x%x\n",
 345                                 data->currvid - 1);
 346                         if (decrease_vid_code_by_step(data, data->currvid - 1, 1))
 347                                 return 1;
 348                         rvosteps--;
 349                 }
 350         }
 351
 352         if (query_current_values_with_pending_wait(data))
 353                 return 1;
 354
 355         if (savefid != data->currfid) {
 356                 printk(KERN_ERR PFX "ph1 err, currfid changed 0x%x\n", data->currfid);
 357                 return 1;
 358         }
 359
 360         dprintk("ph1 complete, currfid 0x%x, currvid 0x%x\n",
 361                 data->currfid, data->currvid);
 362
 363         return 0;
 364 }
 365
 366 /* Phase 2 - core frequency transition */
 367 static int core_frequency_transition(struct powernow_k8_data *data, u32 reqfid)
 368 {
 369         u32 vcoreqfid, vcocurrfid, vcofiddiff, fid_interval, savevid = data->currvid;
 370
 371         if ((reqfid < HI_FID_TABLE_BOTTOM) && (data->currfid < HI_FID_TABLE_BOTTOM)) {
 372                 printk(KERN_ERR PFX "ph2: illegal lo-lo transition 0x%x 0x%x\n",
 373                         reqfid, data->currfid);
 374                 return 1;
 375         }
 376
 377         if (data->currfid == reqfid) {
 378                 printk(KERN_ERR PFX "ph2 null fid transition 0x%x\n", data->currfid);
 379                 return 0;
 380         }
 381
 382         dprintk("ph2 (cpu%d): starting, currfid 0x%x, currvid 0x%x, reqfid 0x%x\n",
 383                 smp_processor_id(),
 384                 data->currfid, data->currvid, reqfid);
 385
 386         vcoreqfid = convert_fid_to_vco_fid(reqfid);
 387         vcocurrfid = convert_fid_to_vco_fid(data->currfid);
 388         vcofiddiff = vcocurrfid > vcoreqfid ? vcocurrfid - vcoreqfid
 389             : vcoreqfid - vcocurrfid;
 390
 391         while (vcofiddiff > 2) {
 392                 (data->currfid & 1) ? (fid_interval = 1) : (fid_interval = 2);
 393
 394                 if (reqfid > data->currfid) {
 395                         if (data->currfid > LO_FID_TABLE_TOP) {
 396                                 if (write_new_fid(data, data->currfid + fid_interval)) {
 397                                         return 1;
 398                                 }
 399                         } else {
 400                                 if (write_new_fid
 401                                     (data, 2 + convert_fid_to_vco_fid(data->currfid))) {
 402                                         return 1;
 403                                 }
 404                         }
 405                 } else {
 406                         if (write_new_fid(data, data->currfid - fid_interval))
 407                                 return 1;
 408                 }
 409
 410                 vcocurrfid = convert_fid_to_vco_fid(data->currfid);
 411                 vcofiddiff = vcocurrfid > vcoreqfid ? vcocurrfid - vcoreqfid
 412                     : vcoreqfid - vcocurrfid;
 413         }
 414
 415         if (write_new_fid(data, reqfid))
 416                 return 1;
 417
 418         if (query_current_values_with_pending_wait(data))
 419                 return 1;
 420
 421         if (data->currfid != reqfid) {
 422                 printk(KERN_ERR PFX
 423                         "ph2: mismatch, failed fid transition, curr 0x%x, req 0x%x\n",
 424                         data->currfid, reqfid);
 425                 return 1;
 426         }
 427
 428         if (savevid != data->currvid) {
 429                 printk(KERN_ERR PFX "ph2: vid changed, save 0x%x, curr 0x%x\n",
 430                         savevid, data->currvid);
 431                 return 1;
 432         }
 433
 434         dprintk("ph2 complete, currfid 0x%x, currvid 0x%x\n",
 435                 data->currfid, data->currvid);
 436
 437         return 0;
 438 }
 439
 440 /* Phase 3 - core voltage transition flow ... jump to the final vid. */
 441 static int core_voltage_post_transition(struct powernow_k8_data *data, u32 reqvid)
 442 {
 443         u32 savefid = data->currfid;
 444         u32 savereqvid = reqvid;
 445
 446         dprintk("ph3 (cpu%d): starting, currfid 0x%x, currvid 0x%x\n",
 447                 smp_processor_id(),
 448                 data->currfid, data->currvid);
 449
 450         if (reqvid != data->currvid) {
 451                 if (write_new_vid(data, reqvid))
 452                         return 1;
 453
 454                 if (savefid != data->currfid) {
 455                         printk(KERN_ERR PFX
 456                                "ph3: bad fid change, save 0x%x, curr 0x%x\n",
 457                                savefid, data->currfid);
 458                         return 1;
 459                 }
 460
 461                 if (data->currvid != reqvid) {
 462                         printk(KERN_ERR PFX
 463                                "ph3: failed vid transition\n, req 0x%x, curr 0x%x",
 464                                reqvid, data->currvid);
 465                         return 1;
 466                 }
 467         }
 468
 469         if (query_current_values_with_pending_wait(data))
 470                 return 1;
 471
 472         if (savereqvid != data->currvid) {
 473                 dprintk("ph3 failed, currvid 0x%x\n", data->currvid);
 474                 return 1;
 475         }
 476
 477         if (savefid != data->currfid) {
 478                 dprintk("ph3 failed, currfid changed 0x%x\n",
 479                         data->currfid);
 480                 return 1;
 481         }
 482
 483         dprintk("ph3 complete, currfid 0x%x, currvid 0x%x\n",
 484                 data->currfid, data->currvid);
 485
 486         return 0;
 487 }
 488
 489 static int check_supported_cpu(unsigned int cpu)
 490 {
 491         cpumask_t oldmask;
 492         u32 eax, ebx, ecx, edx;
 493         unsigned int rc = 0;
 494
 495         oldmask = current->cpus_allowed;
 496         set_cpus_allowed_ptr(current, &cpumask_of_cpu(cpu));
 497
 498         if (smp_processor_id() != cpu) {
 499                 printk(KERN_ERR PFX "limiting to cpu %u failed\n", cpu);
 500                 goto out;
 501         }
 502
 503         if (current_cpu_data.x86_vendor != X86_VENDOR_AMD)
 504                 goto out;
 505
 506         eax = cpuid_eax(CPUID_PROCESSOR_SIGNATURE);
 507         if (((eax & CPUID_XFAM) != CPUID_XFAM_K8) &&
 508             ((eax & CPUID_XFAM) < CPUID_XFAM_10H))
 509                 goto out;
 510
 511         if ((eax & CPUID_XFAM) == CPUID_XFAM_K8) {
 512                 if (((eax & CPUID_USE_XFAM_XMOD) != CPUID_USE_XFAM_XMOD) ||
 513                     ((eax & CPUID_XMOD) > CPUID_XMOD_REV_MASK)) {
 514                         printk(KERN_INFO PFX "Processor cpuid %x not supported\n", eax);
 515                         goto out;
 516                 }
 517
 518                 eax = cpuid_eax(CPUID_GET_MAX_CAPABILITIES);
 519                 if (eax < CPUID_FREQ_VOLT_CAPABILITIES) {
 520                         printk(KERN_INFO PFX
 521                                "No frequency change capabilities detected\n");
 522                         goto out;
 523                 }
 524
 525                 cpuid(CPUID_FREQ_VOLT_CAPABILITIES, &eax, &ebx, &ecx, &edx);
 526                 if ((edx & P_STATE_TRANSITION_CAPABLE) != P_STATE_TRANSITION_CAPABLE) {
 527                         printk(KERN_INFO PFX "Power state transitions not supported\n");
 528                         goto out;
 529                 }
 530         } else { /* must be a HW Pstate capable processor */
 531                 cpuid(CPUID_FREQ_VOLT_CAPABILITIES, &eax, &ebx, &ecx, &edx);
 532                 if ((edx & USE_HW_PSTATE) == USE_HW_PSTATE)
 533                         cpu_family = CPU_HW_PSTATE;
 534                 else
 535                         goto out;
 536         }
 537
 538         rc = 1;
 539
 540 out:
 541         set_cpus_allowed_ptr(current, &oldmask);
 542         return rc;
 543 }
 544
 545 static int check_pst_table(struct powernow_k8_data *data, struct pst_s *pst, u8 maxvid)
 546 {
 547         unsigned int j;
 548         u8 lastfid = 0xff;
 549
 550         for (j = 0; j < data->numps; j++) {
 551                 if (pst[j].vid > LEAST_VID) {
 552                         printk(KERN_ERR FW_BUG PFX "vid %d invalid : 0x%x\n",
 553                                j, pst[j].vid);
 554                         return -EINVAL;
 555                 }
 556                 if (pst[j].vid < data->rvo) {   /* vid + rvo >= 0 */
 557                         printk(KERN_ERR FW_BUG PFX "0 vid exceeded with pstate"
 558                                " %d\n", j);
 559                         return -ENODEV;
 560                 }
 561                 if (pst[j].vid < maxvid + data->rvo) {  /* vid + rvo >= maxvid */
 562                         printk(KERN_ERR FW_BUG PFX "maxvid exceeded with pstate"
 563                                " %d\n", j);
 564                         return -ENODEV;
 565                 }
 566                 if (pst[j].fid > MAX_FID) {
 567                         printk(KERN_ERR FW_BUG PFX "maxfid exceeded with pstate"
 568                                " %d\n", j);
 569                         return -ENODEV;
 570                 }
 571                 if (j && (pst[j].fid < HI_FID_TABLE_BOTTOM)) {
 572                         /* Only first fid is allowed to be in "low" range */
 573                         printk(KERN_ERR FW_BUG PFX "two low fids - %d : "
 574                                "0x%x\n", j, pst[j].fid);
 575                         return -EINVAL;
 576                 }
 577                 if (pst[j].fid < lastfid)
 578                         lastfid = pst[j].fid;
 579         }
 580         if (lastfid & 1) {
 581                 printk(KERN_ERR FW_BUG PFX "lastfid invalid\n");
 582                 return -EINVAL;
 583         }
 584         if (lastfid > LO_FID_TABLE_TOP)
 585                 printk(KERN_INFO FW_BUG PFX  "first fid not from lo freq table\n");
 586
 587         return 0;
 588 }
 589
 590 static void print_basics(struct powernow_k8_data *data)
 591 {
 592         int j;
 593         for (j = 0; j < data->numps; j++) {
 594                 if (data->powernow_table[j].frequency != CPUFREQ_ENTRY_INVALID) {
 595                         if (cpu_family == CPU_HW_PSTATE) {
 596                                 printk(KERN_INFO PFX "   %d : pstate %d (%d MHz)\n",
 597                                         j,
 598                                         data->powernow_table[j].index,
 599                                         data->powernow_table[j].frequency/1000);
 600                         } else {
 601                                 printk(KERN_INFO PFX "   %d : fid 0x%x (%d MHz), vid 0x%x\n",
 602                                         j,
 603                                         data->powernow_table[j].index & 0xff,
 604                                         data->powernow_table[j].frequency/1000,
 605                                         data->powernow_table[j].index >> 8);
 606                         }
 607                 }
 608         }
 609         if (data->batps)
 610                 printk(KERN_INFO PFX "Only %d pstates on battery\n", data->batps);
 611 }
 612
 613 static int fill_powernow_table(struct powernow_k8_data *data, struct pst_s *pst, u8 maxvid)
 614 {
 615         struct cpufreq_frequency_table *powernow_table;
 616         unsigned int j;
 617
 618         if (data->batps) {    /* use ACPI support to get full speed on mains power */
 619                 printk(KERN_WARNING PFX "Only %d pstates usable (use ACPI driver for full range\n", data->batps);
 620                 data->numps = data->batps;
 621         }
 622
 623         for ( j=1; j<data->numps; j++ ) {
 624                 if (pst[j-1].fid >= pst[j].fid) {
 625                         printk(KERN_ERR PFX "PST out of sequence\n");
 626                         return -EINVAL;
 627                 }
 628         }
 629
 630         if (data->numps < 2) {
 631                 printk(KERN_ERR PFX "no p states to transition\n");
 632                 return -ENODEV;
 633         }
 634
 635         if (check_pst_table(data, pst, maxvid))
 636                 return -EINVAL;
 637
 638         powernow_table = kmalloc((sizeof(struct cpufreq_frequency_table)
 639                 * (data->numps + 1)), GFP_KERNEL);
 640         if (!powernow_table) {
 641                 printk(KERN_ERR PFX "powernow_table memory alloc failure\n");
 642                 return -ENOMEM;
 643         }
 644
 645         for (j = 0; j < data->numps; j++) {
 646                 powernow_table[j].index = pst[j].fid; /* lower 8 bits */
 647                 powernow_table[j].index |= (pst[j].vid << 8); /* upper 8 bits */
 648                 powernow_table[j].frequency = find_khz_freq_from_fid(pst[j].fid);
 649         }
 650         powernow_table[data->numps].frequency = CPUFREQ_TABLE_END;
 651         powernow_table[data->numps].index = 0;
 652
 653         if (query_current_values_with_pending_wait(data)) {
 654                 kfree(powernow_table);
 655                 return -EIO;
 656         }
 657
 658         dprintk("cfid 0x%x, cvid 0x%x\n", data->currfid, data->currvid);
 659         data->powernow_table = powernow_table;
 660         if (cpumask_first(cpu_core_mask(data->cpu)) == data->cpu)
 661                 print_basics(data);
 662
 663         for (j = 0; j < data->numps; j++)
 664                 if ((pst[j].fid==data->currfid) && (pst[j].vid==data->currvid))
 665                         return 0;
 666
 667         dprintk("currfid/vid do not match PST, ignoring\n");
 668         return 0;
 669 }
 670
 671 /* Find and validate the PSB/PST table in BIOS. */
 672 static int find_psb_table(struct powernow_k8_data *data)
 673 {
 674         struct psb_s *psb;
 675         unsigned int i;
 676         u32 mvs;
 677         u8 maxvid;
 678         u32 cpst = 0;
 679         u32 thiscpuid;
 680
 681         for (i = 0xc0000; i < 0xffff0; i += 0x10) {
 682                 /* Scan BIOS looking for the signature. */
 683                 /* It can not be at ffff0 - it is too big. */
 684
 685                 psb = phys_to_virt(i);
 686                 if (memcmp(psb, PSB_ID_STRING, PSB_ID_STRING_LEN) != 0)
 687                         continue;
 688
 689                 dprintk("found PSB header at 0x%p\n", psb);
 690
 691                 dprintk("table vers: 0x%x\n", psb->tableversion);
 692                 if (psb->tableversion != PSB_VERSION_1_4) {
 693                         printk(KERN_ERR FW_BUG PFX "PSB table is not v1.4\n");
 694                         return -ENODEV;
 695                 }
 696
 697                 dprintk("flags: 0x%x\n", psb->flags1);
 698                 if (psb->flags1) {
 699                         printk(KERN_ERR FW_BUG PFX "unknown flags\n");
 700                         return -ENODEV;
 701                 }
 702
 703                 data->vstable = psb->vstable;
 704                 dprintk("voltage stabilization time: %d(*20us)\n", data->vstable);
 705
 706                 dprintk("flags2: 0x%x\n", psb->flags2);
 707                 data->rvo = psb->flags2 & 3;
 708                 data->irt = ((psb->flags2) >> 2) & 3;
 709                 mvs = ((psb->flags2) >> 4) & 3;
 710                 data->vidmvs = 1 << mvs;
 711                 data->batps = ((psb->flags2) >> 6) & 3;
 712
 713                 dprintk("ramp voltage offset: %d\n", data->rvo);
 714                 dprintk("isochronous relief time: %d\n", data->irt);
 715                 dprintk("maximum voltage step: %d - 0x%x\n", mvs, data->vidmvs);
 716
 717                 dprintk("numpst: 0x%x\n", psb->num_tables);
 718                 cpst = psb->num_tables;
 719                 if ((psb->cpuid == 0x00000fc0) || (psb->cpuid == 0x00000fe0) ){
 720                         thiscpuid = cpuid_eax(CPUID_PROCESSOR_SIGNATURE);
 721                         if ((thiscpuid == 0x00000fc0) || (thiscpuid == 0x00000fe0) ) {
 722                                 cpst = 1;
 723                         }
 724                 }
 725                 if (cpst != 1) {
 726                         printk(KERN_ERR FW_BUG PFX "numpst must be 1\n");
 727                         return -ENODEV;
 728                 }
 729
 730                 data->plllock = psb->plllocktime;
 731                 dprintk("plllocktime: 0x%x (units 1us)\n", psb->plllocktime);
 732                 dprintk("maxfid: 0x%x\n", psb->maxfid);
 733                 dprintk("maxvid: 0x%x\n", psb->maxvid);
 734                 maxvid = psb->maxvid;
 735
 736                 data->numps = psb->numps;
 737                 dprintk("numpstates: 0x%x\n", data->numps);
 738                 return fill_powernow_table(data, (struct pst_s *)(psb+1), maxvid);
 739         }
 740         /*
 741          * If you see this message, complain to BIOS manufacturer. If
 742          * he tells you "we do not support Linux" or some similar
 743          * nonsense, remember that Windows 2000 uses the same legacy
 744          * mechanism that the old Linux PSB driver uses. Tell them it
 745          * is broken with Windows 2000.
 746          *
 747          * The reference to the AMD documentation is chapter 9 in the
 748          * BIOS and Kernel Developer's Guide, which is available on
 749          * www.amd.com
 750          */
 751         printk(KERN_ERR PFX "BIOS error - no PSB or ACPI _PSS objects\n");
 752         return -ENODEV;
 753 }
 754
 755 #ifdef CONFIG_X86_POWERNOW_K8_ACPI
 756 static void powernow_k8_acpi_pst_values(struct powernow_k8_data *data, unsigned int index)
 757 {
 758         if (!data->acpi_data.state_count || (cpu_family == CPU_HW_PSTATE))
 759                 return;
 760
 761         data->irt = (data->acpi_data.states[index].control >> IRT_SHIFT) & IRT_MASK;
 762         data->rvo = (data->acpi_data.states[index].control >> RVO_SHIFT) & RVO_MASK;
 763         data->exttype = (data->acpi_data.states[index].control >> EXT_TYPE_SHIFT) & EXT_TYPE_MASK;
 764         data->plllock = (data->acpi_data.states[index].control >> PLL_L_SHIFT) & PLL_L_MASK;
 765         data->vidmvs = 1 << ((data->acpi_data.states[index].control >> MVS_SHIFT) & MVS_MASK);
 766         data->vstable = (data->acpi_data.states[index].control >> VST_SHIFT) & VST_MASK;
 767 }
 768
 769 static int powernow_k8_cpu_init_acpi(struct powernow_k8_data *data)
 770 {
 771         struct cpufreq_frequency_table *powernow_table;
 772         int ret_val = -ENODEV;
 773
 774         if (acpi_processor_register_performance(&data->acpi_data, data->cpu)) {
 775                 dprintk("register performance failed: bad ACPI data\n");
 776                 return -EIO;
 777         }
 778
 779         /* verify the data contained in the ACPI structures */
 780         if (data->acpi_data.state_count <= 1) {
 781                 dprintk("No ACPI P-States\n");
 782                 goto err_out;
 783         }
 784
 785         if ((data->acpi_data.control_register.space_id != ACPI_ADR_SPACE_FIXED_HARDWARE) ||
 786                 (data->acpi_data.status_register.space_id != ACPI_ADR_SPACE_FIXED_HARDWARE)) {
 787                 dprintk("Invalid control/status registers (%x - %x)\n",
 788                         data->acpi_data.control_register.space_id,
 789                         data->acpi_data.status_register.space_id);
 790                 goto err_out;
 791         }
 792
 793         /* fill in data->powernow_table */
 794         powernow_table = kmalloc((sizeof(struct cpufreq_frequency_table)
 795                 * (data->acpi_data.state_count + 1)), GFP_KERNEL);
 796         if (!powernow_table) {
 797                 dprintk("powernow_table memory alloc failure\n");
 798                 goto err_out;
 799         }
 800
 801         if (cpu_family == CPU_HW_PSTATE)
 802                 ret_val = fill_powernow_table_pstate(data, powernow_table);
 803         else
 804                 ret_val = fill_powernow_table_fidvid(data, powernow_table);
 805         if (ret_val)
 806                 goto err_out_mem;
 807
 808         powernow_table[data->acpi_data.state_count].frequency = CPUFREQ_TABLE_END;
 809         powernow_table[data->acpi_data.state_count].index = 0;
 810         data->powernow_table = powernow_table;
 811
 812         /* fill in data */
 813         data->numps = data->acpi_data.state_count;
 814         if (cpumask_first(cpu_core_mask(data->cpu)) == data->cpu)
 815                 print_basics(data);
 816         powernow_k8_acpi_pst_values(data, 0);
 817
 818         /* notify BIOS that we exist */
 819         acpi_processor_notify_smm(THIS_MODULE);
 820
 821         if (!alloc_cpumask_var(&data->acpi_data.shared_cpu_map, GFP_KERNEL)) {
 822                 printk(KERN_ERR PFX
 823                                 "unable to alloc powernow_k8_data cpumask\n");
 824                 ret_val = -ENOMEM;
 825                 goto err_out_mem;
 826         }
 827
 828         return 0;
 829
 830 err_out_mem:
 831         kfree(powernow_table);
 832
 833 err_out:
 834         acpi_processor_unregister_performance(&data->acpi_data, data->cpu);
 835
 836         /* data->acpi_data.state_count informs us at ->exit() whether ACPI was used */
 837         data->acpi_data.state_count = 0;
 838
 839         return ret_val;
 840 }
 841
 842 static int fill_powernow_table_pstate(struct powernow_k8_data *data, struct cpufreq_frequency_table *powernow_table)
 843 {
 844         int i;
 845         u32 hi = 0, lo = 0;
 846         rdmsr(MSR_PSTATE_CUR_LIMIT, hi, lo);
 847         data->max_hw_pstate = (hi & HW_PSTATE_MAX_MASK) >> HW_PSTATE_MAX_SHIFT;
 848
 849         for (i = 0; i < data->acpi_data.state_count; i++) {
 850                 u32 index;
 851
 852                 index = data->acpi_data.states[i].control & HW_PSTATE_MASK;
 853                 if (index > data->max_hw_pstate) {
 854                         printk(KERN_ERR PFX "invalid pstate %d - bad value %d.\n", i, index);
 855                         printk(KERN_ERR PFX "Please report to BIOS manufacturer\n");
 856                         powernow_table[i].frequency = CPUFREQ_ENTRY_INVALID;
 857                         continue;
 858                 }
 859                 rdmsr(MSR_PSTATE_DEF_BASE + index, lo, hi);
 860                 if (!(hi & HW_PSTATE_VALID_MASK)) {
 861                         dprintk("invalid pstate %d, ignoring\n", index);
 862                         powernow_table[i].frequency = CPUFREQ_ENTRY_INVALID;
 863                         continue;
 864                 }
 865
 866                 powernow_table[i].index = index;
 867
 868                 powernow_table[i].frequency = data->acpi_data.states[i].core_frequency * 1000;
 869         }
 870         return 0;
 871 }
 872
 873 static int fill_powernow_table_fidvid(struct powernow_k8_data *data, struct cpufreq_frequency_table *powernow_table)
 874 {
 875         int i;
 876         int cntlofreq = 0;
 877         for (i = 0; i < data->acpi_data.state_count; i++) {
 878                 u32 fid;
 879                 u32 vid;
 880
 881                 if (data->exttype) {
 882                         fid = data->acpi_data.states[i].status & EXT_FID_MASK;
 883                         vid = (data->acpi_data.states[i].status >> VID_SHIFT) & EXT_VID_MASK;
 884                 } else {
 885                         fid = data->acpi_data.states[i].control & FID_MASK;
 886                         vid = (data->acpi_data.states[i].control >> VID_SHIFT) & VID_MASK;
 887                 }
 888
 889                 dprintk("   %d : fid 0x%x, vid 0x%x\n", i, fid, vid);
 890
 891                 powernow_table[i].index = fid; /* lower 8 bits */
 892                 powernow_table[i].index |= (vid << 8); /* upper 8 bits */
 893                 powernow_table[i].frequency = find_khz_freq_from_fid(fid);
 894
 895                 /* verify frequency is OK */
 896                 if ((powernow_table[i].frequency > (MAX_FREQ * 1000)) ||
 897                         (powernow_table[i].frequency < (MIN_FREQ * 1000))) {
 898                         dprintk("invalid freq %u kHz, ignoring\n", powernow_table[i].frequency);
 899                         powernow_table[i].frequency = CPUFREQ_ENTRY_INVALID;
 900                         continue;
 901                 }
 902
 903                 /* verify voltage is OK - BIOSs are using "off" to indicate invalid */
 904                 if (vid == VID_OFF) {
 905                         dprintk("invalid vid %u, ignoring\n", vid);
 906                         powernow_table[i].frequency = CPUFREQ_ENTRY_INVALID;
 907                         continue;
 908                 }
 909
 910                 /* verify only 1 entry from the lo frequency table */
 911                 if (fid < HI_FID_TABLE_BOTTOM) {
 912                         if (cntlofreq) {
 913                                 /* if both entries are the same, ignore this one ... */
 914                                 if ((powernow_table[i].frequency != powernow_table[cntlofreq].frequency) ||
 915                                     (powernow_table[i].index != powernow_table[cntlofreq].index)) {
 916                                         printk(KERN_ERR PFX "Too many lo freq table entries\n");
 917                                         return 1;
 918                                 }
 919
 920                                 dprintk("double low frequency table entry, ignoring it.\n");
 921                                 powernow_table[i].frequency = CPUFREQ_ENTRY_INVALID;
 922                                 continue;
 923                         } else
 924                                 cntlofreq = i;
 925                 }
 926
 927                 if (powernow_table[i].frequency != (data->acpi_data.states[i].core_frequency * 1000)) {
 928                         printk(KERN_INFO PFX "invalid freq entries %u kHz vs. %u kHz\n",
 929                                 powernow_table[i].frequency,
 930                                 (unsigned int) (data->acpi_data.states[i].core_frequency * 1000));
 931                         powernow_table[i].frequency = CPUFREQ_ENTRY_INVALID;
 932                         continue;
 933                 }
 934         }
 935         return 0;
 936 }
 937
 938 static void powernow_k8_cpu_exit_acpi(struct powernow_k8_data *data)
 939 {
 940         if (data->acpi_data.state_count)
 941                 acpi_processor_unregister_performance(&data->acpi_data, data->cpu);
 942         free_cpumask_var(data->acpi_data.shared_cpu_map);
 943 }
 944
 945 static int get_transition_latency(struct powernow_k8_data *data)
 946 {
 947         int max_latency = 0;
 948         int i;
 949         for (i = 0; i < data->acpi_data.state_count; i++) {
 950                 int cur_latency = data->acpi_data.states[i].transition_latency
 951                         + data->acpi_data.states[i].bus_master_latency;
 952                 if (cur_latency > max_latency)
 953                         max_latency = cur_latency;
 954         }
 955         /* value in usecs, needs to be in nanoseconds */
 956         return 1000 * max_latency;
 957 }
 958
 959 #else
 960 static int powernow_k8_cpu_init_acpi(struct powernow_k8_data *data) { return -ENODEV; }
 961 static void powernow_k8_cpu_exit_acpi(struct powernow_k8_data *data) { return; }
 962 static void powernow_k8_acpi_pst_values(struct powernow_k8_data *data, unsigned int index) { return; }
 963 static int get_transition_latency(struct powernow_k8_data *data) { return 0; }
 964 #endif /* CONFIG_X86_POWERNOW_K8_ACPI */
 965
 966 /* Take a frequency, and issue the fid/vid transition command */
 967 static int transition_frequency_fidvid(struct powernow_k8_data *data, unsigned int index)
 968 {
 969         u32 fid = 0;
 970         u32 vid = 0;
 971         int res, i;
 972         struct cpufreq_freqs freqs;
 973
 974         dprintk("cpu %d transition to index %u\n", smp_processor_id(), index);
 975
 976         /* fid/vid correctness check for k8 */
 977         /* fid are the lower 8 bits of the index we stored into
 978          * the cpufreq frequency table in find_psb_table, vid
 979          * are the upper 8 bits.
 980          */
 981         fid = data->powernow_table[index].index & 0xFF;
 982         vid = (data->powernow_table[index].index & 0xFF00) >> 8;
 983
 984         dprintk("table matched fid 0x%x, giving vid 0x%x\n", fid, vid);
 985
 986         if (query_current_values_with_pending_wait(data))
 987                 return 1;
 988
 989         if ((data->currvid == vid) && (data->currfid == fid)) {
 990                 dprintk("target matches current values (fid 0x%x, vid 0x%x)\n",
 991                         fid, vid);
 992                 return 0;
 993         }
 994
 995         if ((fid < HI_FID_TABLE_BOTTOM) && (data->currfid < HI_FID_TABLE_BOTTOM)) {
 996                 printk(KERN_ERR PFX
 997                        "ignoring illegal change in lo freq table-%x to 0x%x\n",
 998                        data->currfid, fid);
 999                 return 1;
1000         }
1001
1002         dprintk("cpu %d, changing to fid 0x%x, vid 0x%x\n",
1003                 smp_processor_id(), fid, vid);
1004         freqs.old = find_khz_freq_from_fid(data->currfid);
1005         freqs.new = find_khz_freq_from_fid(fid);
1006
1007         for_each_cpu_mask_nr(i, *(data->available_cores)) {
1008                 freqs.cpu = i;
1009                 cpufreq_notify_transition(&freqs, CPUFREQ_PRECHANGE);
1010         }
1011
1012         res = transition_fid_vid(data, fid, vid);
1013         freqs.new = find_khz_freq_from_fid(data->currfid);
1014
1015         for_each_cpu_mask_nr(i, *(data->available_cores)) {
1016                 freqs.cpu = i;
1017                 cpufreq_notify_transition(&freqs, CPUFREQ_POSTCHANGE);
1018         }
1019         return res;
1020 }
1021
1022 /* Take a frequency, and issue the hardware pstate transition command */
1023 static int transition_frequency_pstate(struct powernow_k8_data *data, unsigned int index)
1024 {
1025         u32 pstate = 0;
1026         int res, i;
1027         struct cpufreq_freqs freqs;
1028
1029         dprintk("cpu %d transition to index %u\n", smp_processor_id(), index);
1030
1031         /* get MSR index for hardware pstate transition */
1032         pstate = index & HW_PSTATE_MASK;
1033         if (pstate > data->max_hw_pstate)
1034                 return 0;
1035         freqs.old = find_khz_freq_from_pstate(data->powernow_table, data->currpstate);
1036         freqs.new = find_khz_freq_from_pstate(data->powernow_table, pstate);
1037
1038         for_each_cpu_mask_nr(i, *(data->available_cores)) {
1039                 freqs.cpu = i;
1040                 cpufreq_notify_transition(&freqs, CPUFREQ_PRECHANGE);
1041         }
1042
1043         res = transition_pstate(data, pstate);
1044         freqs.new = find_khz_freq_from_pstate(data->powernow_table, pstate);
1045
1046         for_each_cpu_mask_nr(i, *(data->available_cores)) {
1047                 freqs.cpu = i;
1048                 cpufreq_notify_transition(&freqs, CPUFREQ_POSTCHANGE);
1049         }
1050         return res;
1051 }
1052
1053 /* Driver entry point to switch to the target frequency */
1054 static int powernowk8_target(struct cpufreq_policy *pol, unsigned targfreq, unsigned relation)
1055 {
1056         cpumask_t oldmask;
1057         struct powernow_k8_data *data = per_cpu(powernow_data, pol->cpu);
1058         u32 checkfid;
1059         u32 checkvid;
1060         unsigned int newstate;
1061         int ret = -EIO;
1062
1063         if (!data)
1064                 return -EINVAL;
1065
1066         checkfid = data->currfid;
1067         checkvid = data->currvid;
1068
1069         /* only run on specific CPU from here on */
1070         oldmask = current->cpus_allowed;
1071         set_cpus_allowed_ptr(current, &cpumask_of_cpu(pol->cpu));
1072
1073         if (smp_processor_id() != pol->cpu) {
1074                 printk(KERN_ERR PFX "limiting to cpu %u failed\n", pol->cpu);
1075                 goto err_out;
1076         }
1077
1078         if (pending_bit_stuck()) {
1079                 printk(KERN_ERR PFX "failing targ, change pending bit set\n");
1080                 goto err_out;
1081         }
1082
1083         dprintk("targ: cpu %d, %d kHz, min %d, max %d, relation %d\n",
1084                 pol->cpu, targfreq, pol->min, pol->max, relation);
1085
1086         if (query_current_values_with_pending_wait(data))
1087                 goto err_out;
1088
1089         if (cpu_family != CPU_HW_PSTATE) {
1090                 dprintk("targ: curr fid 0x%x, vid 0x%x\n",
1091                 data->currfid, data->currvid);
1092
1093                 if ((checkvid != data->currvid) || (checkfid != data->currfid)) {
1094                         printk(KERN_INFO PFX
1095                                 "error - out of sync, fix 0x%x 0x%x, vid 0x%x 0x%x\n",
1096                                 checkfid, data->currfid, checkvid, data->currvid);
1097                 }
1098         }
1099
1100         if (cpufreq_frequency_table_target(pol, data->powernow_table, targfreq, relation, &newstate))
1101                 goto err_out;
1102
1103         mutex_lock(&fidvid_mutex);
1104
1105         powernow_k8_acpi_pst_values(data, newstate);
1106
1107         if (cpu_family == CPU_HW_PSTATE)
1108                 ret = transition_frequency_pstate(data, newstate);
1109         else
1110                 ret = transition_frequency_fidvid(data, newstate);
1111         if (ret) {
1112                 printk(KERN_ERR PFX "transition frequency failed\n");
1113                 ret = 1;
1114                 mutex_unlock(&fidvid_mutex);
1115                 goto err_out;
1116         }
1117         mutex_unlock(&fidvid_mutex);
1118
1119         if (cpu_family == CPU_HW_PSTATE)
1120                 pol->cur = find_khz_freq_from_pstate(data->powernow_table, newstate);
1121         else
1122                 pol->cur = find_khz_freq_from_fid(data->currfid);
1123         ret = 0;
1124
1125 err_out:
1126         set_cpus_allowed_ptr(current, &oldmask);
1127         return ret;
1128 }
1129
1130 /* Driver entry point to verify the policy and range of frequencies */
1131 static int powernowk8_verify(struct cpufreq_policy *pol)
1132 {
1133         struct powernow_k8_data *data = per_cpu(powernow_data, pol->cpu);
1134
1135         if (!data)
1136                 return -EINVAL;
1137
1138         return cpufreq_frequency_table_verify(pol, data->powernow_table);
1139 }
1140
1141 /* per CPU init entry point to the driver */
1142 static int __cpuinit powernowk8_cpu_init(struct cpufreq_policy *pol)
1143 {
1144         struct powernow_k8_data *data;
1145         cpumask_t oldmask;
1146         int rc;
1147
1148         if (!cpu_online(pol->cpu))
1149                 return -ENODEV;
1150
1151         if (!check_supported_cpu(pol->cpu))
1152                 return -ENODEV;
1153
1154         data = kzalloc(sizeof(struct powernow_k8_data), GFP_KERNEL);
1155         if (!data) {
1156                 printk(KERN_ERR PFX "unable to alloc powernow_k8_data");
1157                 return -ENOMEM;
1158         }
1159
1160         data->cpu = pol->cpu;
1161         data->currpstate = HW_PSTATE_INVALID;
1162
1163         if (powernow_k8_cpu_init_acpi(data)) {
1164                 /*
1165                  * Use the PSB BIOS structure. This is only availabe on
1166                  * an UP version, and is deprecated by AMD.
1167                  */
1168                 if (num_online_cpus() != 1) {
1169 #ifndef CONFIG_ACPI_PROCESSOR
1170                         printk(KERN_ERR PFX "ACPI Processor support is required "
1171                                "for SMP systems but is absent. Please load the "
1172                                "ACPI Processor module before starting this "
1173                                "driver.\n");
1174 #else
1175                         printk(KERN_ERR FW_BUG PFX "Your BIOS does not provide"
1176                                " ACPI _PSS objects in a way that Linux "
1177                                "understands. Please report this to the Linux "
1178                                "ACPI maintainers and complain to your BIOS "
1179                                "vendor.\n");
1180 #endif
1181                         kfree(data);
1182                         return -ENODEV;
1183                 }
1184                 if (pol->cpu != 0) {
1185                         printk(KERN_ERR FW_BUG PFX "No ACPI _PSS objects for "
1186                                "CPU other than CPU0. Complain to your BIOS "
1187                                "vendor.\n");
1188                         kfree(data);
1189                         return -ENODEV;
1190                 }
1191                 rc = find_psb_table(data);
1192                 if (rc) {
1193                         kfree(data);
1194                         return -ENODEV;
1195                 }
1196                 /* Take a crude guess here.
1197                  * That guess was in microseconds, so multiply with 1000 */
1198                 pol->cpuinfo.transition_latency = (
1199                          ((data->rvo + 8) * data->vstable * VST_UNITS_20US) +
1200                          ((1 << data->irt) * 30)) * 1000;
1201         } else /* ACPI _PSS objects available */
1202                 pol->cpuinfo.transition_latency = get_transition_latency(data);
1203
1204         /* only run on specific CPU from here on */
1205         oldmask = current->cpus_allowed;
1206         set_cpus_allowed_ptr(current, &cpumask_of_cpu(pol->cpu));
1207
1208         if (smp_processor_id() != pol->cpu) {
1209                 printk(KERN_ERR PFX "limiting to cpu %u failed\n", pol->cpu);
1210                 goto err_out;
1211         }
1212
1213         if (pending_bit_stuck()) {
1214                 printk(KERN_ERR PFX "failing init, change pending bit set\n");
1215                 goto err_out;
1216         }
1217
1218         if (query_current_values_with_pending_wait(data))
1219                 goto err_out;
1220
1221         if (cpu_family == CPU_OPTERON)
1222                 fidvid_msr_init();
1223
1224         /* run on any CPU again */
1225         set_cpus_allowed_ptr(current, &oldmask);
1226
1227         if (cpu_family == CPU_HW_PSTATE)
1228                 cpumask_copy(pol->cpus, cpumask_of(pol->cpu));
1229         else
1230                 cpumask_copy(pol->cpus, cpu_core_mask(pol->cpu));
1231         data->available_cores = pol->cpus;
1232
1233         if (cpu_family == CPU_HW_PSTATE)
1234                 pol->cur = find_khz_freq_from_pstate(data->powernow_table, data->currpstate);
1235         else
1236                 pol->cur = find_khz_freq_from_fid(data->currfid);
1237         dprintk("policy current frequency %d kHz\n", pol->cur);
1238
1239         /* min/max the cpu is capable of */
1240         if (cpufreq_frequency_table_cpuinfo(pol, data->powernow_table)) {
1241                 printk(KERN_ERR FW_BUG PFX "invalid powernow_table\n");
1242                 powernow_k8_cpu_exit_acpi(data);
1243                 kfree(data->powernow_table);
1244                 kfree(data);
1245                 return -EINVAL;
1246         }
1247
1248         cpufreq_frequency_table_get_attr(data->powernow_table, pol->cpu);
1249
1250         if (cpu_family == CPU_HW_PSTATE)
1251                 dprintk("cpu_init done, current pstate 0x%x\n", data->currpstate);
1252         else
1253                 dprintk("cpu_init done, current fid 0x%x, vid 0x%x\n",
1254                         data->currfid, data->currvid);
1255
1256         per_cpu(powernow_data, pol->cpu) = data;
1257
1258         return 0;
1259
1260 err_out:
1261         set_cpus_allowed_ptr(current, &oldmask);
1262         powernow_k8_cpu_exit_acpi(data);
1263
1264         kfree(data);
1265         return -ENODEV;
1266 }
1267
1268 static int __devexit powernowk8_cpu_exit (struct cpufreq_policy *pol)
1269 {
1270         struct powernow_k8_data *data = per_cpu(powernow_data, pol->cpu);
1271
1272         if (!data)
1273                 return -EINVAL;
1274
1275         powernow_k8_cpu_exit_acpi(data);
1276
1277         cpufreq_frequency_table_put_attr(pol->cpu);
1278
1279         kfree(data->powernow_table);
1280         kfree(data);
1281
1282         return 0;
1283 }
1284
1285 static unsigned int powernowk8_get (unsigned int cpu)
1286 {
1287         struct powernow_k8_data *data;
1288         cpumask_t oldmask = current->cpus_allowed;
1289         unsigned int khz = 0;
1290         unsigned int first;
1291
1292         first = cpumask_first(cpu_core_mask(cpu));
1293         data = per_cpu(powernow_data, first);
1294
1295         if (!data)
1296                 return -EINVAL;
1297
1298         set_cpus_allowed_ptr(current, &cpumask_of_cpu(cpu));
1299         if (smp_processor_id() != cpu) {
1300                 printk(KERN_ERR PFX
1301                         "limiting to CPU %d failed in powernowk8_get\n", cpu);
1302                 set_cpus_allowed_ptr(current, &oldmask);
1303                 return 0;
1304         }
1305
1306         if (query_current_values_with_pending_wait(data))
1307                 goto out;
1308
1309         if (cpu_family == CPU_HW_PSTATE)
1310                 khz = find_khz_freq_from_pstate(data->powernow_table,
1311                                                 data->currpstate);
1312         else
1313                 khz = find_khz_freq_from_fid(data->currfid);
1314
1315
1316 out:
1317         set_cpus_allowed_ptr(current, &oldmask);
1318         return khz;
1319 }
1320
1321 static struct freq_attr* powernow_k8_attr[] = {
1322         &cpufreq_freq_attr_scaling_available_freqs,
1323         NULL,
1324 };
1325
1326 static struct cpufreq_driver cpufreq_amd64_driver = {
1327         .verify = powernowk8_verify,
1328         .target = powernowk8_target,
1329         .init = powernowk8_cpu_init,
1330         .exit = __devexit_p(powernowk8_cpu_exit),
1331         .get = powernowk8_get,
1332         .name = "powernow-k8",
1333         .owner = THIS_MODULE,
1334         .attr = powernow_k8_attr,
1335 };
1336
1337 /* driver entry point for init */
1338 static int __cpuinit powernowk8_init(void)
1339 {
1340         unsigned int i, supported_cpus = 0;
1341
1342         for_each_online_cpu(i) {
1343                 if (check_supported_cpu(i))
1344                         supported_cpus++;
1345         }
1346
1347         if (supported_cpus == num_online_cpus()) {
1348                 printk(KERN_INFO PFX "Found %d %s "
1349                         "processors (%d cpu cores) (" VERSION ")\n",
1350                         num_online_nodes(),
1351                         boot_cpu_data.x86_model_id, supported_cpus);
1352                 return cpufreq_register_driver(&cpufreq_amd64_driver);
1353         }
1354
1355         return -ENODEV;
1356 }
1357
1358 /* driver entry point for term */
1359 static void __exit powernowk8_exit(void)
1360 {
1361         dprintk("exit\n");
1362
1363         cpufreq_unregister_driver(&cpufreq_amd64_driver);
1364 }
1365
1366 MODULE_AUTHOR("Paul Devriendt <paul.devriendt@amd.com> and Mark Langsdorf <mark.langsdorf@amd.com>");
1367 MODULE_DESCRIPTION("AMD Athlon 64 and Opteron processor frequency driver.");
1368 MODULE_LICENSE("GPL");
1369
1370 late_initcall(powernowk8_init);
1371 module_exit(powernowk8_exit);