arch/i386/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 2.00.00"
  50 #include "powernow-k8.h"
  51
  52 /* serialize freq changes  */
  53 static DEFINE_MUTEX(fidvid_mutex);
  54
  55 static struct powernow_k8_data *powernow_data[NR_CPUS];
  56
  57 static int cpu_family = CPU_OPTERON;
  58
  59 #ifndef CONFIG_SMP
  60 static cpumask_t cpu_core_map[1];
  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 /* Return a frequency in MHz, given an input fid and did */
  77 static u32 find_freq_from_fiddid(u32 fid, u32 did)
  78 {
  79         return 100 * (fid + 0x10) >> did;
  80 }
  81
  82 static u32 find_khz_freq_from_fiddid(u32 fid, u32 did)
  83 {
  84         return 1000 * find_freq_from_fiddid(fid, did);
  85 }
  86
  87 static u32 find_fid_from_pstate(u32 pstate)
  88 {
  89         u32 hi, lo;
  90         rdmsr(MSR_PSTATE_DEF_BASE + pstate, lo, hi);
  91         return lo & HW_PSTATE_FID_MASK;
  92 }
  93
  94 static u32 find_did_from_pstate(u32 pstate)
  95 {
  96         u32 hi, lo;
  97         rdmsr(MSR_PSTATE_DEF_BASE + pstate, lo, hi);
  98         return (lo & HW_PSTATE_DID_MASK) >> HW_PSTATE_DID_SHIFT;
  99 }
 100
 101 /* Return the vco fid for an input fid
 102  *
 103  * Each "low" fid has corresponding "high" fid, and you can get to "low" fids
 104  * only from corresponding high fids. This returns "high" fid corresponding to
 105  * "low" one.
 106  */
 107 static u32 convert_fid_to_vco_fid(u32 fid)
 108 {
 109         if (fid < HI_FID_TABLE_BOTTOM)
 110                 return 8 + (2 * fid);
 111         else
 112                 return fid;
 113 }
 114
 115 /*
 116  * Return 1 if the pending bit is set. Unless we just instructed the processor
 117  * to transition to a new state, seeing this bit set is really bad news.
 118  */
 119 static int pending_bit_stuck(void)
 120 {
 121         u32 lo, hi;
 122
 123         if (cpu_family == CPU_HW_PSTATE)
 124                 return 0;
 125
 126         rdmsr(MSR_FIDVID_STATUS, lo, hi);
 127         return lo & MSR_S_LO_CHANGE_PENDING ? 1 : 0;
 128 }
 129
 130 /*
 131  * Update the global current fid / vid values from the status msr.
 132  * Returns 1 on error.
 133  */
 134 static int query_current_values_with_pending_wait(struct powernow_k8_data *data)
 135 {
 136         u32 lo, hi;
 137         u32 i = 0;
 138
 139         if (cpu_family == CPU_HW_PSTATE) {
 140                 rdmsr(MSR_PSTATE_STATUS, lo, hi);
 141                 i = lo & HW_PSTATE_MASK;
 142                 rdmsr(MSR_PSTATE_DEF_BASE + i, lo, hi);
 143                 data->currfid = lo & HW_PSTATE_FID_MASK;
 144                 data->currdid = (lo & HW_PSTATE_DID_MASK) >> HW_PSTATE_DID_SHIFT;
 145                 return 0;
 146         }
 147         do {
 148                 if (i++ > 10000) {
 149                         dprintk("detected change pending stuck\n");
 150                         return 1;
 151                 }
 152                 rdmsr(MSR_FIDVID_STATUS, lo, hi);
 153         } while (lo & MSR_S_LO_CHANGE_PENDING);
 154
 155         data->currvid = hi & MSR_S_HI_CURRENT_VID;
 156         data->currfid = lo & MSR_S_LO_CURRENT_FID;
 157
 158         return 0;
 159 }
 160
 161 /* the isochronous relief time */
 162 static void count_off_irt(struct powernow_k8_data *data)
 163 {
 164         udelay((1 << data->irt) * 10);
 165         return;
 166 }
 167
 168 /* the voltage stabalization time */
 169 static void count_off_vst(struct powernow_k8_data *data)
 170 {
 171         udelay(data->vstable * VST_UNITS_20US);
 172         return;
 173 }
 174
 175 /* need to init the control msr to a safe value (for each cpu) */
 176 static void fidvid_msr_init(void)
 177 {
 178         u32 lo, hi;
 179         u8 fid, vid;
 180
 181         rdmsr(MSR_FIDVID_STATUS, lo, hi);
 182         vid = hi & MSR_S_HI_CURRENT_VID;
 183         fid = lo & MSR_S_LO_CURRENT_FID;
 184         lo = fid | (vid << MSR_C_LO_VID_SHIFT);
 185         hi = MSR_C_HI_STP_GNT_BENIGN;
 186         dprintk("cpu%d, init lo 0x%x, hi 0x%x\n", smp_processor_id(), lo, hi);
 187         wrmsr(MSR_FIDVID_CTL, lo, hi);
 188 }
 189
 190
 191 /* write the new fid value along with the other control fields to the msr */
 192 static int write_new_fid(struct powernow_k8_data *data, u32 fid)
 193 {
 194         u32 lo;
 195         u32 savevid = data->currvid;
 196         u32 i = 0;
 197
 198         if ((fid & INVALID_FID_MASK) || (data->currvid & INVALID_VID_MASK)) {
 199                 printk(KERN_ERR PFX "internal error - overflow on fid write\n");
 200                 return 1;
 201         }
 202
 203         lo = fid | (data->currvid << MSR_C_LO_VID_SHIFT) | MSR_C_LO_INIT_FID_VID;
 204
 205         dprintk("writing fid 0x%x, lo 0x%x, hi 0x%x\n",
 206                 fid, lo, data->plllock * PLL_LOCK_CONVERSION);
 207
 208         do {
 209                 wrmsr(MSR_FIDVID_CTL, lo, data->plllock * PLL_LOCK_CONVERSION);
 210                 if (i++ > 100) {
 211                         printk(KERN_ERR PFX "Hardware error - pending bit very stuck - no further pstate changes possible\n");
 212                         return 1;
 213                 }
 214         } while (query_current_values_with_pending_wait(data));
 215
 216         count_off_irt(data);
 217
 218         if (savevid != data->currvid) {
 219                 printk(KERN_ERR PFX "vid change on fid trans, old 0x%x, new 0x%x\n",
 220                        savevid, data->currvid);
 221                 return 1;
 222         }
 223
 224         if (fid != data->currfid) {
 225                 printk(KERN_ERR PFX "fid trans failed, fid 0x%x, curr 0x%x\n", fid,
 226                         data->currfid);
 227                 return 1;
 228         }
 229
 230         return 0;
 231 }
 232
 233 /* Write a new vid to the hardware */
 234 static int write_new_vid(struct powernow_k8_data *data, u32 vid)
 235 {
 236         u32 lo;
 237         u32 savefid = data->currfid;
 238         int i = 0;
 239
 240         if ((data->currfid & INVALID_FID_MASK) || (vid & INVALID_VID_MASK)) {
 241                 printk(KERN_ERR PFX "internal error - overflow on vid write\n");
 242                 return 1;
 243         }
 244
 245         lo = data->currfid | (vid << MSR_C_LO_VID_SHIFT) | MSR_C_LO_INIT_FID_VID;
 246
 247         dprintk("writing vid 0x%x, lo 0x%x, hi 0x%x\n",
 248                 vid, lo, STOP_GRANT_5NS);
 249
 250         do {
 251                 wrmsr(MSR_FIDVID_CTL, lo, STOP_GRANT_5NS);
 252                 if (i++ > 100) {
 253                         printk(KERN_ERR PFX "internal error - pending bit very stuck - no further pstate changes possible\n");
 254                         return 1;
 255                 }
 256         } while (query_current_values_with_pending_wait(data));
 257
 258         if (savefid != data->currfid) {
 259                 printk(KERN_ERR PFX "fid changed on vid trans, old 0x%x new 0x%x\n",
 260                        savefid, data->currfid);
 261                 return 1;
 262         }
 263
 264         if (vid != data->currvid) {
 265                 printk(KERN_ERR PFX "vid trans failed, vid 0x%x, curr 0x%x\n", vid,
 266                                 data->currvid);
 267                 return 1;
 268         }
 269
 270         return 0;
 271 }
 272
 273 /*
 274  * Reduce the vid by the max of step or reqvid.
 275  * Decreasing vid codes represent increasing voltages:
 276  * vid of 0 is 1.550V, vid of 0x1e is 0.800V, vid of VID_OFF is off.
 277  */
 278 static int decrease_vid_code_by_step(struct powernow_k8_data *data, u32 reqvid, u32 step)
 279 {
 280         if ((data->currvid - reqvid) > step)
 281                 reqvid = data->currvid - step;
 282
 283         if (write_new_vid(data, reqvid))
 284                 return 1;
 285
 286         count_off_vst(data);
 287
 288         return 0;
 289 }
 290
 291 /* Change hardware pstate by single MSR write */
 292 static int transition_pstate(struct powernow_k8_data *data, u32 pstate)
 293 {
 294         wrmsr(MSR_PSTATE_CTRL, pstate, 0);
 295         data->currfid = find_fid_from_pstate(pstate);
 296         return 0;
 297 }
 298
 299 /* Change Opteron/Athlon64 fid and vid, by the 3 phases. */
 300 static int transition_fid_vid(struct powernow_k8_data *data, u32 reqfid, u32 reqvid)
 301 {
 302         if (core_voltage_pre_transition(data, reqvid))
 303                 return 1;
 304
 305         if (core_frequency_transition(data, reqfid))
 306                 return 1;
 307
 308         if (core_voltage_post_transition(data, reqvid))
 309                 return 1;
 310
 311         if (query_current_values_with_pending_wait(data))
 312                 return 1;
 313
 314         if ((reqfid != data->currfid) || (reqvid != data->currvid)) {
 315                 printk(KERN_ERR PFX "failed (cpu%d): req 0x%x 0x%x, curr 0x%x 0x%x\n",
 316                                 smp_processor_id(),
 317                                 reqfid, reqvid, data->currfid, data->currvid);
 318                 return 1;
 319         }
 320
 321         dprintk("transitioned (cpu%d): new fid 0x%x, vid 0x%x\n",
 322                 smp_processor_id(), data->currfid, data->currvid);
 323
 324         return 0;
 325 }
 326
 327 /* Phase 1 - core voltage transition ... setup voltage */
 328 static int core_voltage_pre_transition(struct powernow_k8_data *data, u32 reqvid)
 329 {
 330         u32 rvosteps = data->rvo;
 331         u32 savefid = data->currfid;
 332         u32 maxvid, lo;
 333
 334         dprintk("ph1 (cpu%d): start, currfid 0x%x, currvid 0x%x, reqvid 0x%x, rvo 0x%x\n",
 335                 smp_processor_id(),
 336                 data->currfid, data->currvid, reqvid, data->rvo);
 337
 338         rdmsr(MSR_FIDVID_STATUS, lo, maxvid);
 339         maxvid = 0x1f & (maxvid >> 16);
 340         dprintk("ph1 maxvid=0x%x\n", maxvid);
 341         if (reqvid < maxvid) /* lower numbers are higher voltages */
 342                 reqvid = maxvid;
 343
 344         while (data->currvid > reqvid) {
 345                 dprintk("ph1: curr 0x%x, req vid 0x%x\n",
 346                         data->currvid, reqvid);
 347                 if (decrease_vid_code_by_step(data, reqvid, data->vidmvs))
 348                         return 1;
 349         }
 350
 351         while ((rvosteps > 0) && ((data->rvo + data->currvid) > reqvid)) {
 352                 if (data->currvid == maxvid) {
 353                         rvosteps = 0;
 354                 } else {
 355                         dprintk("ph1: changing vid for rvo, req 0x%x\n",
 356                                 data->currvid - 1);
 357                         if (decrease_vid_code_by_step(data, data->currvid - 1, 1))
 358                                 return 1;
 359                         rvosteps--;
 360                 }
 361         }
 362
 363         if (query_current_values_with_pending_wait(data))
 364                 return 1;
 365
 366         if (savefid != data->currfid) {
 367                 printk(KERN_ERR PFX "ph1 err, currfid changed 0x%x\n", data->currfid);
 368                 return 1;
 369         }
 370
 371         dprintk("ph1 complete, currfid 0x%x, currvid 0x%x\n",
 372                 data->currfid, data->currvid);
 373
 374         return 0;
 375 }
 376
 377 /* Phase 2 - core frequency transition */
 378 static int core_frequency_transition(struct powernow_k8_data *data, u32 reqfid)
 379 {
 380         u32 vcoreqfid, vcocurrfid, vcofiddiff, fid_interval, savevid = data->currvid;
 381
 382         if ((reqfid < HI_FID_TABLE_BOTTOM) && (data->currfid < HI_FID_TABLE_BOTTOM)) {
 383                 printk(KERN_ERR PFX "ph2: illegal lo-lo transition 0x%x 0x%x\n",
 384                         reqfid, data->currfid);
 385                 return 1;
 386         }
 387
 388         if (data->currfid == reqfid) {
 389                 printk(KERN_ERR PFX "ph2 null fid transition 0x%x\n", data->currfid);
 390                 return 0;
 391         }
 392
 393         dprintk("ph2 (cpu%d): starting, currfid 0x%x, currvid 0x%x, reqfid 0x%x\n",
 394                 smp_processor_id(),
 395                 data->currfid, data->currvid, reqfid);
 396
 397         vcoreqfid = convert_fid_to_vco_fid(reqfid);
 398         vcocurrfid = convert_fid_to_vco_fid(data->currfid);
 399         vcofiddiff = vcocurrfid > vcoreqfid ? vcocurrfid - vcoreqfid
 400             : vcoreqfid - vcocurrfid;
 401
 402         while (vcofiddiff > 2) {
 403                 (data->currfid & 1) ? (fid_interval = 1) : (fid_interval = 2);
 404
 405                 if (reqfid > data->currfid) {
 406                         if (data->currfid > LO_FID_TABLE_TOP) {
 407                                 if (write_new_fid(data, data->currfid + fid_interval)) {
 408                                         return 1;
 409                                 }
 410                         } else {
 411                                 if (write_new_fid
 412                                     (data, 2 + convert_fid_to_vco_fid(data->currfid))) {
 413                                         return 1;
 414                                 }
 415                         }
 416                 } else {
 417                         if (write_new_fid(data, data->currfid - fid_interval))
 418                                 return 1;
 419                 }
 420
 421                 vcocurrfid = convert_fid_to_vco_fid(data->currfid);
 422                 vcofiddiff = vcocurrfid > vcoreqfid ? vcocurrfid - vcoreqfid
 423                     : vcoreqfid - vcocurrfid;
 424         }
 425
 426         if (write_new_fid(data, reqfid))
 427                 return 1;
 428
 429         if (query_current_values_with_pending_wait(data))
 430                 return 1;
 431
 432         if (data->currfid != reqfid) {
 433                 printk(KERN_ERR PFX
 434                         "ph2: mismatch, failed fid transition, curr 0x%x, req 0x%x\n",
 435                         data->currfid, reqfid);
 436                 return 1;
 437         }
 438
 439         if (savevid != data->currvid) {
 440                 printk(KERN_ERR PFX "ph2: vid changed, save 0x%x, curr 0x%x\n",
 441                         savevid, data->currvid);
 442                 return 1;
 443         }
 444
 445         dprintk("ph2 complete, currfid 0x%x, currvid 0x%x\n",
 446                 data->currfid, data->currvid);
 447
 448         return 0;
 449 }
 450
 451 /* Phase 3 - core voltage transition flow ... jump to the final vid. */
 452 static int core_voltage_post_transition(struct powernow_k8_data *data, u32 reqvid)
 453 {
 454         u32 savefid = data->currfid;
 455         u32 savereqvid = reqvid;
 456
 457         dprintk("ph3 (cpu%d): starting, currfid 0x%x, currvid 0x%x\n",
 458                 smp_processor_id(),
 459                 data->currfid, data->currvid);
 460
 461         if (reqvid != data->currvid) {
 462                 if (write_new_vid(data, reqvid))
 463                         return 1;
 464
 465                 if (savefid != data->currfid) {
 466                         printk(KERN_ERR PFX
 467                                "ph3: bad fid change, save 0x%x, curr 0x%x\n",
 468                                savefid, data->currfid);
 469                         return 1;
 470                 }
 471
 472                 if (data->currvid != reqvid) {
 473                         printk(KERN_ERR PFX
 474                                "ph3: failed vid transition\n, req 0x%x, curr 0x%x",
 475                                reqvid, data->currvid);
 476                         return 1;
 477                 }
 478         }
 479
 480         if (query_current_values_with_pending_wait(data))
 481                 return 1;
 482
 483         if (savereqvid != data->currvid) {
 484                 dprintk("ph3 failed, currvid 0x%x\n", data->currvid);
 485                 return 1;
 486         }
 487
 488         if (savefid != data->currfid) {
 489                 dprintk("ph3 failed, currfid changed 0x%x\n",
 490                         data->currfid);
 491                 return 1;
 492         }
 493
 494         dprintk("ph3 complete, currfid 0x%x, currvid 0x%x\n",
 495                 data->currfid, data->currvid);
 496
 497         return 0;
 498 }
 499
 500 static int check_supported_cpu(unsigned int cpu)
 501 {
 502         cpumask_t oldmask = CPU_MASK_ALL;
 503         u32 eax, ebx, ecx, edx;
 504         unsigned int rc = 0;
 505
 506         oldmask = current->cpus_allowed;
 507         set_cpus_allowed(current, cpumask_of_cpu(cpu));
 508
 509         if (smp_processor_id() != cpu) {
 510                 printk(KERN_ERR PFX "limiting to cpu %u failed\n", cpu);
 511                 goto out;
 512         }
 513
 514         if (current_cpu_data.x86_vendor != X86_VENDOR_AMD)
 515                 goto out;
 516
 517         eax = cpuid_eax(CPUID_PROCESSOR_SIGNATURE);
 518         if (((eax & CPUID_XFAM) != CPUID_XFAM_K8) &&
 519             ((eax & CPUID_XFAM) < CPUID_XFAM_10H))
 520                 goto out;
 521
 522         if ((eax & CPUID_XFAM) == CPUID_XFAM_K8) {
 523                 if (((eax & CPUID_USE_XFAM_XMOD) != CPUID_USE_XFAM_XMOD) ||
 524                     ((eax & CPUID_XMOD) > CPUID_XMOD_REV_MASK)) {
 525                         printk(KERN_INFO PFX "Processor cpuid %x not supported\n", eax);
 526                         goto out;
 527                 }
 528
 529                 eax = cpuid_eax(CPUID_GET_MAX_CAPABILITIES);
 530                 if (eax < CPUID_FREQ_VOLT_CAPABILITIES) {
 531                         printk(KERN_INFO PFX
 532                                "No frequency change capabilities detected\n");
 533                         goto out;
 534                 }
 535
 536                 cpuid(CPUID_FREQ_VOLT_CAPABILITIES, &eax, &ebx, &ecx, &edx);
 537                 if ((edx & P_STATE_TRANSITION_CAPABLE) != P_STATE_TRANSITION_CAPABLE) {
 538                         printk(KERN_INFO PFX "Power state transitions not supported\n");
 539                         goto out;
 540                 }
 541         } else { /* must be a HW Pstate capable processor */
 542                 cpuid(CPUID_FREQ_VOLT_CAPABILITIES, &eax, &ebx, &ecx, &edx);
 543                 if ((edx & USE_HW_PSTATE) == USE_HW_PSTATE)
 544                         cpu_family = CPU_HW_PSTATE;
 545                 else
 546                         goto out;
 547         }
 548
 549         rc = 1;
 550
 551 out:
 552         set_cpus_allowed(current, oldmask);
 553         return rc;
 554 }
 555
 556 static int check_pst_table(struct powernow_k8_data *data, struct pst_s *pst, u8 maxvid)
 557 {
 558         unsigned int j;
 559         u8 lastfid = 0xff;
 560
 561         for (j = 0; j < data->numps; j++) {
 562                 if (pst[j].vid > LEAST_VID) {
 563                         printk(KERN_ERR PFX "vid %d invalid : 0x%x\n", j, pst[j].vid);
 564                         return -EINVAL;
 565                 }
 566                 if (pst[j].vid < data->rvo) {   /* vid + rvo >= 0 */
 567                         printk(KERN_ERR BFX "0 vid exceeded with pstate %d\n", j);
 568                         return -ENODEV;
 569                 }
 570                 if (pst[j].vid < maxvid + data->rvo) {  /* vid + rvo >= maxvid */
 571                         printk(KERN_ERR BFX "maxvid exceeded with pstate %d\n", j);
 572                         return -ENODEV;
 573                 }
 574                 if (pst[j].fid > MAX_FID) {
 575                         printk(KERN_ERR BFX "maxfid exceeded with pstate %d\n", j);
 576                         return -ENODEV;
 577                 }
 578                 if (j && (pst[j].fid < HI_FID_TABLE_BOTTOM)) {
 579                         /* Only first fid is allowed to be in "low" range */
 580                         printk(KERN_ERR BFX "two low fids - %d : 0x%x\n", j, pst[j].fid);
 581                         return -EINVAL;
 582                 }
 583                 if (pst[j].fid < lastfid)
 584                         lastfid = pst[j].fid;
 585         }
 586         if (lastfid & 1) {
 587                 printk(KERN_ERR BFX "lastfid invalid\n");
 588                 return -EINVAL;
 589         }
 590         if (lastfid > LO_FID_TABLE_TOP)
 591                 printk(KERN_INFO BFX  "first fid not from lo freq table\n");
 592
 593         return 0;
 594 }
 595
 596 static void print_basics(struct powernow_k8_data *data)
 597 {
 598         int j;
 599         for (j = 0; j < data->numps; j++) {
 600                 if (data->powernow_table[j].frequency != CPUFREQ_ENTRY_INVALID) {
 601                         if (cpu_family == CPU_HW_PSTATE) {
 602                         printk(KERN_INFO PFX "   %d : fid 0x%x gid 0x%x (%d MHz)\n", j, (data->powernow_table[j].index & 0xff00) >> 8,
 603                                 (data->powernow_table[j].index & 0xff0000) >> 16,
 604                                 data->powernow_table[j].frequency/1000);
 605                         } else {
 606                         printk(KERN_INFO PFX "   %d : fid 0x%x (%d MHz), vid 0x%x\n", j,
 607                                 data->powernow_table[j].index & 0xff,
 608                                 data->powernow_table[j].frequency/1000,
 609                                 data->powernow_table[j].index >> 8);
 610                         }
 611                 }
 612         }
 613         if (data->batps)
 614                 printk(KERN_INFO PFX "Only %d pstates on battery\n", data->batps);
 615 }
 616
 617 static int fill_powernow_table(struct powernow_k8_data *data, struct pst_s *pst, u8 maxvid)
 618 {
 619         struct cpufreq_frequency_table *powernow_table;
 620         unsigned int j;
 621
 622         if (data->batps) {    /* use ACPI support to get full speed on mains power */
 623                 printk(KERN_WARNING PFX "Only %d pstates usable (use ACPI driver for full range\n", data->batps);
 624                 data->numps = data->batps;
 625         }
 626
 627         for ( j=1; j<data->numps; j++ ) {
 628                 if (pst[j-1].fid >= pst[j].fid) {
 629                         printk(KERN_ERR PFX "PST out of sequence\n");
 630                         return -EINVAL;
 631                 }
 632         }
 633
 634         if (data->numps < 2) {
 635                 printk(KERN_ERR PFX "no p states to transition\n");
 636                 return -ENODEV;
 637         }
 638
 639         if (check_pst_table(data, pst, maxvid))
 640                 return -EINVAL;
 641
 642         powernow_table = kmalloc((sizeof(struct cpufreq_frequency_table)
 643                 * (data->numps + 1)), GFP_KERNEL);
 644         if (!powernow_table) {
 645                 printk(KERN_ERR PFX "powernow_table memory alloc failure\n");
 646                 return -ENOMEM;
 647         }
 648
 649         for (j = 0; j < data->numps; j++) {
 650                 powernow_table[j].index = pst[j].fid; /* lower 8 bits */
 651                 powernow_table[j].index |= (pst[j].vid << 8); /* upper 8 bits */
 652                 powernow_table[j].frequency = find_khz_freq_from_fid(pst[j].fid);
 653         }
 654         powernow_table[data->numps].frequency = CPUFREQ_TABLE_END;
 655         powernow_table[data->numps].index = 0;
 656
 657         if (query_current_values_with_pending_wait(data)) {
 658                 kfree(powernow_table);
 659                 return -EIO;
 660         }
 661
 662         dprintk("cfid 0x%x, cvid 0x%x\n", data->currfid, data->currvid);
 663         data->powernow_table = powernow_table;
 664         if (first_cpu(cpu_core_map[data->cpu]) == data->cpu)
 665                 print_basics(data);
 666
 667         for (j = 0; j < data->numps; j++)
 668                 if ((pst[j].fid==data->currfid) && (pst[j].vid==data->currvid))
 669                         return 0;
 670
 671         dprintk("currfid/vid do not match PST, ignoring\n");
 672         return 0;
 673 }
 674
 675 /* Find and validate the PSB/PST table in BIOS. */
 676 static int find_psb_table(struct powernow_k8_data *data)
 677 {
 678         struct psb_s *psb;
 679         unsigned int i;
 680         u32 mvs;
 681         u8 maxvid;
 682         u32 cpst = 0;
 683         u32 thiscpuid;
 684
 685         for (i = 0xc0000; i < 0xffff0; i += 0x10) {
 686                 /* Scan BIOS looking for the signature. */
 687                 /* It can not be at ffff0 - it is too big. */
 688
 689                 psb = phys_to_virt(i);
 690                 if (memcmp(psb, PSB_ID_STRING, PSB_ID_STRING_LEN) != 0)
 691                         continue;
 692
 693                 dprintk("found PSB header at 0x%p\n", psb);
 694
 695                 dprintk("table vers: 0x%x\n", psb->tableversion);
 696                 if (psb->tableversion != PSB_VERSION_1_4) {
 697                         printk(KERN_ERR BFX "PSB table is not v1.4\n");
 698                         return -ENODEV;
 699                 }
 700
 701                 dprintk("flags: 0x%x\n", psb->flags1);
 702                 if (psb->flags1) {
 703                         printk(KERN_ERR BFX "unknown flags\n");
 704                         return -ENODEV;
 705                 }
 706
 707                 data->vstable = psb->vstable;
 708                 dprintk("voltage stabilization time: %d(*20us)\n", data->vstable);
 709
 710                 dprintk("flags2: 0x%x\n", psb->flags2);
 711                 data->rvo = psb->flags2 & 3;
 712                 data->irt = ((psb->flags2) >> 2) & 3;
 713                 mvs = ((psb->flags2) >> 4) & 3;
 714                 data->vidmvs = 1 << mvs;
 715                 data->batps = ((psb->flags2) >> 6) & 3;
 716
 717                 dprintk("ramp voltage offset: %d\n", data->rvo);
 718                 dprintk("isochronous relief time: %d\n", data->irt);
 719                 dprintk("maximum voltage step: %d - 0x%x\n", mvs, data->vidmvs);
 720
 721                 dprintk("numpst: 0x%x\n", psb->num_tables);
 722                 cpst = psb->num_tables;
 723                 if ((psb->cpuid == 0x00000fc0) || (psb->cpuid == 0x00000fe0) ){
 724                         thiscpuid = cpuid_eax(CPUID_PROCESSOR_SIGNATURE);
 725                         if ((thiscpuid == 0x00000fc0) || (thiscpuid == 0x00000fe0) ) {
 726                                 cpst = 1;
 727                         }
 728                 }
 729                 if (cpst != 1) {
 730                         printk(KERN_ERR BFX "numpst must be 1\n");
 731                         return -ENODEV;
 732                 }
 733
 734                 data->plllock = psb->plllocktime;
 735                 dprintk("plllocktime: 0x%x (units 1us)\n", psb->plllocktime);
 736                 dprintk("maxfid: 0x%x\n", psb->maxfid);
 737                 dprintk("maxvid: 0x%x\n", psb->maxvid);
 738                 maxvid = psb->maxvid;
 739
 740                 data->numps = psb->numps;
 741                 dprintk("numpstates: 0x%x\n", data->numps);
 742                 return fill_powernow_table(data, (struct pst_s *)(psb+1), maxvid);
 743         }
 744         /*
 745          * If you see this message, complain to BIOS manufacturer. If
 746          * he tells you "we do not support Linux" or some similar
 747          * nonsense, remember that Windows 2000 uses the same legacy
 748          * mechanism that the old Linux PSB driver uses. Tell them it
 749          * is broken with Windows 2000.
 750          *
 751          * The reference to the AMD documentation is chapter 9 in the
 752          * BIOS and Kernel Developer's Guide, which is available on
 753          * www.amd.com
 754          */
 755         printk(KERN_ERR PFX "BIOS error - no PSB or ACPI _PSS objects\n");
 756         return -ENODEV;
 757 }
 758
 759 #ifdef CONFIG_X86_POWERNOW_K8_ACPI
 760 static void powernow_k8_acpi_pst_values(struct powernow_k8_data *data, unsigned int index)
 761 {
 762         if (!data->acpi_data.state_count || (cpu_family == CPU_HW_PSTATE))
 763                 return;
 764
 765         data->irt = (data->acpi_data.states[index].control >> IRT_SHIFT) & IRT_MASK;
 766         data->rvo = (data->acpi_data.states[index].control >> RVO_SHIFT) & RVO_MASK;
 767         data->exttype = (data->acpi_data.states[index].control >> EXT_TYPE_SHIFT) & EXT_TYPE_MASK;
 768         data->plllock = (data->acpi_data.states[index].control >> PLL_L_SHIFT) & PLL_L_MASK;
 769         data->vidmvs = 1 << ((data->acpi_data.states[index].control >> MVS_SHIFT) & MVS_MASK);
 770         data->vstable = (data->acpi_data.states[index].control >> VST_SHIFT) & VST_MASK;
 771 }
 772
 773 static int powernow_k8_cpu_init_acpi(struct powernow_k8_data *data)
 774 {
 775         struct cpufreq_frequency_table *powernow_table;
 776         int ret_val;
 777
 778         if (acpi_processor_register_performance(&data->acpi_data, data->cpu)) {
 779                 dprintk("register performance failed: bad ACPI data\n");
 780                 return -EIO;
 781         }
 782
 783         /* verify the data contained in the ACPI structures */
 784         if (data->acpi_data.state_count <= 1) {
 785                 dprintk("No ACPI P-States\n");
 786                 goto err_out;
 787         }
 788
 789         if ((data->acpi_data.control_register.space_id != ACPI_ADR_SPACE_FIXED_HARDWARE) ||
 790                 (data->acpi_data.status_register.space_id != ACPI_ADR_SPACE_FIXED_HARDWARE)) {
 791                 dprintk("Invalid control/status registers (%x - %x)\n",
 792                         data->acpi_data.control_register.space_id,
 793                         data->acpi_data.status_register.space_id);
 794                 goto err_out;
 795         }
 796
 797         /* fill in data->powernow_table */
 798         powernow_table = kmalloc((sizeof(struct cpufreq_frequency_table)
 799                 * (data->acpi_data.state_count + 1)), GFP_KERNEL);
 800         if (!powernow_table) {
 801                 dprintk("powernow_table memory alloc failure\n");
 802                 goto err_out;
 803         }
 804
 805         if (cpu_family == CPU_HW_PSTATE)
 806                 ret_val = fill_powernow_table_pstate(data, powernow_table);
 807         else
 808                 ret_val = fill_powernow_table_fidvid(data, powernow_table);
 809         if (ret_val)
 810                 goto err_out_mem;
 811
 812         powernow_table[data->acpi_data.state_count].frequency = CPUFREQ_TABLE_END;
 813         powernow_table[data->acpi_data.state_count].index = 0;
 814         data->powernow_table = powernow_table;
 815
 816         /* fill in data */
 817         data->numps = data->acpi_data.state_count;
 818         if (first_cpu(cpu_core_map[data->cpu]) == data->cpu)
 819                 print_basics(data);
 820         powernow_k8_acpi_pst_values(data, 0);
 821
 822         /* notify BIOS that we exist */
 823         acpi_processor_notify_smm(THIS_MODULE);
 824
 825         return 0;
 826
 827 err_out_mem:
 828         kfree(powernow_table);
 829
 830 err_out:
 831         acpi_processor_unregister_performance(&data->acpi_data, data->cpu);
 832
 833         /* data->acpi_data.state_count informs us at ->exit() whether ACPI was used */
 834         data->acpi_data.state_count = 0;
 835
 836         return -ENODEV;
 837 }
 838
 839 static int fill_powernow_table_pstate(struct powernow_k8_data *data, struct cpufreq_frequency_table *powernow_table)
 840 {
 841         int i;
 842
 843         for (i = 0; i < data->acpi_data.state_count; i++) {
 844                 u32 index;
 845                 u32 hi = 0, lo = 0;
 846                 u32 fid;
 847                 u32 did;
 848
 849                 index = data->acpi_data.states[i].control & HW_PSTATE_MASK;
 850                 if (index > MAX_HW_PSTATE) {
 851                         printk(KERN_ERR PFX "invalid pstate %d - bad value %d.\n", i, index);
 852                         printk(KERN_ERR PFX "Please report to BIOS manufacturer\n");
 853                 }
 854                 rdmsr(MSR_PSTATE_DEF_BASE + index, lo, hi);
 855                 if (!(hi & HW_PSTATE_VALID_MASK)) {
 856                         dprintk("invalid pstate %d, ignoring\n", index);
 857                         powernow_table[i].frequency = CPUFREQ_ENTRY_INVALID;
 858                         continue;
 859                 }
 860
 861                 fid = lo & HW_PSTATE_FID_MASK;
 862                 did = (lo & HW_PSTATE_DID_MASK) >> HW_PSTATE_DID_SHIFT;
 863
 864                 dprintk("   %d : fid 0x%x, did 0x%x\n", index, fid, did);
 865
 866                 powernow_table[i].index = index | (fid << HW_FID_INDEX_SHIFT) | (did << HW_DID_INDEX_SHIFT);
 867
 868                 powernow_table[i].frequency = find_khz_freq_from_fiddid(fid, did);
 869
 870                 if (powernow_table[i].frequency != (data->acpi_data.states[i].core_frequency * 1000)) {
 871                         printk(KERN_INFO PFX "invalid freq entries %u kHz vs. %u kHz\n",
 872                                 powernow_table[i].frequency,
 873                                 (unsigned int) (data->acpi_data.states[i].core_frequency * 1000));
 874                         powernow_table[i].frequency = CPUFREQ_ENTRY_INVALID;
 875                         continue;
 876                 }
 877         }
 878         return 0;
 879 }
 880
 881 static int fill_powernow_table_fidvid(struct powernow_k8_data *data, struct cpufreq_frequency_table *powernow_table)
 882 {
 883         int i;
 884         int cntlofreq = 0;
 885         for (i = 0; i < data->acpi_data.state_count; i++) {
 886                 u32 fid;
 887                 u32 vid;
 888
 889                 if (data->exttype) {
 890                         fid = data->acpi_data.states[i].status & EXT_FID_MASK;
 891                         vid = (data->acpi_data.states[i].status >> VID_SHIFT) & EXT_VID_MASK;
 892                 } else {
 893                         fid = data->acpi_data.states[i].control & FID_MASK;
 894                         vid = (data->acpi_data.states[i].control >> VID_SHIFT) & VID_MASK;
 895                 }
 896
 897                 dprintk("   %d : fid 0x%x, vid 0x%x\n", i, fid, vid);
 898
 899                 powernow_table[i].index = fid; /* lower 8 bits */
 900                 powernow_table[i].index |= (vid << 8); /* upper 8 bits */
 901                 powernow_table[i].frequency = find_khz_freq_from_fid(fid);
 902
 903                 /* verify frequency is OK */
 904                 if ((powernow_table[i].frequency > (MAX_FREQ * 1000)) ||
 905                         (powernow_table[i].frequency < (MIN_FREQ * 1000))) {
 906                         dprintk("invalid freq %u kHz, ignoring\n", powernow_table[i].frequency);
 907                         powernow_table[i].frequency = CPUFREQ_ENTRY_INVALID;
 908                         continue;
 909                 }
 910
 911                 /* verify voltage is OK - BIOSs are using "off" to indicate invalid */
 912                 if (vid == VID_OFF) {
 913                         dprintk("invalid vid %u, ignoring\n", vid);
 914                         powernow_table[i].frequency = CPUFREQ_ENTRY_INVALID;
 915                         continue;
 916                 }
 917
 918                 /* verify only 1 entry from the lo frequency table */
 919                 if (fid < HI_FID_TABLE_BOTTOM) {
 920                         if (cntlofreq) {
 921                                 /* if both entries are the same, ignore this one ... */
 922                                 if ((powernow_table[i].frequency != powernow_table[cntlofreq].frequency) ||
 923                                     (powernow_table[i].index != powernow_table[cntlofreq].index)) {
 924                                         printk(KERN_ERR PFX "Too many lo freq table entries\n");
 925                                         return 1;
 926                                 }
 927
 928                                 dprintk("double low frequency table entry, ignoring it.\n");
 929                                 powernow_table[i].frequency = CPUFREQ_ENTRY_INVALID;
 930                                 continue;
 931                         } else
 932                                 cntlofreq = i;
 933                 }
 934
 935                 if (powernow_table[i].frequency != (data->acpi_data.states[i].core_frequency * 1000)) {
 936                         printk(KERN_INFO PFX "invalid freq entries %u kHz vs. %u kHz\n",
 937                                 powernow_table[i].frequency,
 938                                 (unsigned int) (data->acpi_data.states[i].core_frequency * 1000));
 939                         powernow_table[i].frequency = CPUFREQ_ENTRY_INVALID;
 940                         continue;
 941                 }
 942         }
 943         return 0;
 944 }
 945
 946 static void powernow_k8_cpu_exit_acpi(struct powernow_k8_data *data)
 947 {
 948         if (data->acpi_data.state_count)
 949                 acpi_processor_unregister_performance(&data->acpi_data, data->cpu);
 950 }
 951
 952 #else
 953 static int powernow_k8_cpu_init_acpi(struct powernow_k8_data *data) { return -ENODEV; }
 954 static void powernow_k8_cpu_exit_acpi(struct powernow_k8_data *data) { return; }
 955 static void powernow_k8_acpi_pst_values(struct powernow_k8_data *data, unsigned int index) { return; }
 956 #endif /* CONFIG_X86_POWERNOW_K8_ACPI */
 957
 958 /* Take a frequency, and issue the fid/vid transition command */
 959 static int transition_frequency_fidvid(struct powernow_k8_data *data, unsigned int index)
 960 {
 961         u32 fid = 0;
 962         u32 vid = 0;
 963         int res, i;
 964         struct cpufreq_freqs freqs;
 965
 966         dprintk("cpu %d transition to index %u\n", smp_processor_id(), index);
 967
 968         /* fid/vid correctness check for k8 */
 969         /* fid are the lower 8 bits of the index we stored into
 970          * the cpufreq frequency table in find_psb_table, vid
 971          * are the upper 8 bits.
 972          */
 973         fid = data->powernow_table[index].index & 0xFF;
 974         vid = (data->powernow_table[index].index & 0xFF00) >> 8;
 975
 976         dprintk("table matched fid 0x%x, giving vid 0x%x\n", fid, vid);
 977
 978         if (query_current_values_with_pending_wait(data))
 979                 return 1;
 980
 981         if ((data->currvid == vid) && (data->currfid == fid)) {
 982                 dprintk("target matches current values (fid 0x%x, vid 0x%x)\n",
 983                         fid, vid);
 984                 return 0;
 985         }
 986
 987         if ((fid < HI_FID_TABLE_BOTTOM) && (data->currfid < HI_FID_TABLE_BOTTOM)) {
 988                 printk(KERN_ERR PFX
 989                        "ignoring illegal change in lo freq table-%x to 0x%x\n",
 990                        data->currfid, fid);
 991                 return 1;
 992         }
 993
 994         dprintk("cpu %d, changing to fid 0x%x, vid 0x%x\n",
 995                 smp_processor_id(), fid, vid);
 996         freqs.old = find_khz_freq_from_fid(data->currfid);
 997         freqs.new = find_khz_freq_from_fid(fid);
 998
 999         for_each_cpu_mask(i, *(data->available_cores)) {
1000                 freqs.cpu = i;
1001                 cpufreq_notify_transition(&freqs, CPUFREQ_PRECHANGE);
1002         }
1003
1004         res = transition_fid_vid(data, fid, vid);
1005         freqs.new = find_khz_freq_from_fid(data->currfid);
1006
1007         for_each_cpu_mask(i, *(data->available_cores)) {
1008                 freqs.cpu = i;
1009                 cpufreq_notify_transition(&freqs, CPUFREQ_POSTCHANGE);
1010         }
1011         return res;
1012 }
1013
1014 /* Take a frequency, and issue the hardware pstate transition command */
1015 static int transition_frequency_pstate(struct powernow_k8_data *data, unsigned int index)
1016 {
1017         u32 fid = 0;
1018         u32 did = 0;
1019         u32 pstate = 0;
1020         int res, i;
1021         struct cpufreq_freqs freqs;
1022
1023         dprintk("cpu %d transition to index %u\n", smp_processor_id(), index);
1024
1025         /* get fid did for hardware pstate transition */
1026         pstate = index & HW_PSTATE_MASK;
1027         if (pstate > MAX_HW_PSTATE)
1028                 return 0;
1029         fid = (index & HW_FID_INDEX_MASK) >> HW_FID_INDEX_SHIFT;
1030         did = (index & HW_DID_INDEX_MASK) >> HW_DID_INDEX_SHIFT;
1031         freqs.old = find_khz_freq_from_fiddid(data->currfid, data->currdid);
1032         freqs.new = find_khz_freq_from_fiddid(fid, did);
1033
1034         for_each_cpu_mask(i, *(data->available_cores)) {
1035                 freqs.cpu = i;
1036                 cpufreq_notify_transition(&freqs, CPUFREQ_PRECHANGE);
1037         }
1038
1039         res = transition_pstate(data, pstate);
1040         data->currfid = find_fid_from_pstate(pstate);
1041         data->currdid = find_did_from_pstate(pstate);
1042         freqs.new = find_khz_freq_from_fiddid(data->currfid, data->currdid);
1043
1044         for_each_cpu_mask(i, *(data->available_cores)) {
1045                 freqs.cpu = i;
1046                 cpufreq_notify_transition(&freqs, CPUFREQ_POSTCHANGE);
1047         }
1048         return res;
1049 }
1050
1051 /* Driver entry point to switch to the target frequency */
1052 static int powernowk8_target(struct cpufreq_policy *pol, unsigned targfreq, unsigned relation)
1053 {
1054         cpumask_t oldmask = CPU_MASK_ALL;
1055         struct powernow_k8_data *data = powernow_data[pol->cpu];
1056         u32 checkfid;
1057         u32 checkvid;
1058         unsigned int newstate;
1059         int ret = -EIO;
1060
1061         if (!data)
1062                 return -EINVAL;
1063
1064         checkfid = data->currfid;
1065         checkvid = data->currvid;
1066
1067         /* only run on specific CPU from here on */
1068         oldmask = current->cpus_allowed;
1069         set_cpus_allowed(current, cpumask_of_cpu(pol->cpu));
1070
1071         if (smp_processor_id() != pol->cpu) {
1072                 printk(KERN_ERR PFX "limiting to cpu %u failed\n", pol->cpu);
1073                 goto err_out;
1074         }
1075
1076         if (pending_bit_stuck()) {
1077                 printk(KERN_ERR PFX "failing targ, change pending bit set\n");
1078                 goto err_out;
1079         }
1080
1081         dprintk("targ: cpu %d, %d kHz, min %d, max %d, relation %d\n",
1082                 pol->cpu, targfreq, pol->min, pol->max, relation);
1083
1084         if (query_current_values_with_pending_wait(data))
1085                 goto err_out;
1086
1087         if (cpu_family == CPU_HW_PSTATE)
1088                 dprintk("targ: curr fid 0x%x, did 0x%x\n",
1089                         data->currfid, data->currvid);
1090         else {
1091                 dprintk("targ: curr fid 0x%x, vid 0x%x\n",
1092                 data->currfid, data->currvid);
1093
1094                 if ((checkvid != data->currvid) || (checkfid != data->currfid)) {
1095                         printk(KERN_INFO PFX
1096                                 "error - out of sync, fix 0x%x 0x%x, vid 0x%x 0x%x\n",
1097                                 checkfid, data->currfid, checkvid, data->currvid);
1098                 }
1099         }
1100
1101         if (cpufreq_frequency_table_target(pol, data->powernow_table, targfreq, relation, &newstate))
1102                 goto err_out;
1103
1104         mutex_lock(&fidvid_mutex);
1105
1106         powernow_k8_acpi_pst_values(data, newstate);
1107
1108         if (cpu_family == CPU_HW_PSTATE)
1109                 ret = transition_frequency_pstate(data, newstate);
1110         else
1111                 ret = transition_frequency_fidvid(data, newstate);
1112         if (ret) {
1113                 printk(KERN_ERR PFX "transition frequency failed\n");
1114                 ret = 1;
1115                 mutex_unlock(&fidvid_mutex);
1116                 goto err_out;
1117         }
1118         mutex_unlock(&fidvid_mutex);
1119
1120         if (cpu_family == CPU_HW_PSTATE)
1121                 pol->cur = find_khz_freq_from_fiddid(data->currfid, data->currdid);
1122         else
1123                 pol->cur = find_khz_freq_from_fid(data->currfid);
1124         ret = 0;
1125
1126 err_out:
1127         set_cpus_allowed(current, oldmask);
1128         return ret;
1129 }
1130
1131 /* Driver entry point to verify the policy and range of frequencies */
1132 static int powernowk8_verify(struct cpufreq_policy *pol)
1133 {
1134         struct powernow_k8_data *data = powernow_data[pol->cpu];
1135
1136         if (!data)
1137                 return -EINVAL;
1138
1139         return cpufreq_frequency_table_verify(pol, data->powernow_table);
1140 }
1141
1142 /* per CPU init entry point to the driver */
1143 static int __cpuinit powernowk8_cpu_init(struct cpufreq_policy *pol)
1144 {
1145         struct powernow_k8_data *data;
1146         cpumask_t oldmask = CPU_MASK_ALL;
1147         int rc;
1148
1149         if (!cpu_online(pol->cpu))
1150                 return -ENODEV;
1151
1152         if (!check_supported_cpu(pol->cpu))
1153                 return -ENODEV;
1154
1155         data = kzalloc(sizeof(struct powernow_k8_data), GFP_KERNEL);
1156         if (!data) {
1157                 printk(KERN_ERR PFX "unable to alloc powernow_k8_data");
1158                 return -ENOMEM;
1159         }
1160
1161         data->cpu = pol->cpu;
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                         printk(KERN_ERR PFX "MP systems not supported by PSB BIOS structure\n");
1170                         kfree(data);
1171                         return -ENODEV;
1172                 }
1173                 if (pol->cpu != 0) {
1174                         printk(KERN_ERR PFX "No _PSS objects for CPU other than CPU0\n");
1175                         kfree(data);
1176                         return -ENODEV;
1177                 }
1178                 rc = find_psb_table(data);
1179                 if (rc) {
1180                         kfree(data);
1181                         return -ENODEV;
1182                 }
1183         }
1184
1185         /* only run on specific CPU from here on */
1186         oldmask = current->cpus_allowed;
1187         set_cpus_allowed(current, cpumask_of_cpu(pol->cpu));
1188
1189         if (smp_processor_id() != pol->cpu) {
1190                 printk(KERN_ERR PFX "limiting to cpu %u failed\n", pol->cpu);
1191                 goto err_out;
1192         }
1193
1194         if (pending_bit_stuck()) {
1195                 printk(KERN_ERR PFX "failing init, change pending bit set\n");
1196                 goto err_out;
1197         }
1198
1199         if (query_current_values_with_pending_wait(data))
1200                 goto err_out;
1201
1202         if (cpu_family == CPU_OPTERON)
1203                 fidvid_msr_init();
1204
1205         /* run on any CPU again */
1206         set_cpus_allowed(current, oldmask);
1207
1208         pol->governor = CPUFREQ_DEFAULT_GOVERNOR;
1209         if (cpu_family == CPU_HW_PSTATE)
1210                 pol->cpus = cpumask_of_cpu(pol->cpu);
1211         else
1212                 pol->cpus = cpu_core_map[pol->cpu];
1213         data->available_cores = &(pol->cpus);
1214
1215         /* Take a crude guess here.
1216          * That guess was in microseconds, so multiply with 1000 */
1217         pol->cpuinfo.transition_latency = (((data->rvo + 8) * data->vstable * VST_UNITS_20US)
1218             + (3 * (1 << data->irt) * 10)) * 1000;
1219
1220         if (cpu_family == CPU_HW_PSTATE)
1221                 pol->cur = find_khz_freq_from_fiddid(data->currfid, data->currdid);
1222         else
1223                 pol->cur = find_khz_freq_from_fid(data->currfid);
1224         dprintk("policy current frequency %d kHz\n", pol->cur);
1225
1226         /* min/max the cpu is capable of */
1227         if (cpufreq_frequency_table_cpuinfo(pol, data->powernow_table)) {
1228                 printk(KERN_ERR PFX "invalid powernow_table\n");
1229                 powernow_k8_cpu_exit_acpi(data);
1230                 kfree(data->powernow_table);
1231                 kfree(data);
1232                 return -EINVAL;
1233         }
1234
1235         cpufreq_frequency_table_get_attr(data->powernow_table, pol->cpu);
1236
1237         if (cpu_family == CPU_HW_PSTATE)
1238                 dprintk("cpu_init done, current fid 0x%x, did 0x%x\n",
1239                         data->currfid, data->currdid);
1240         else
1241                 dprintk("cpu_init done, current fid 0x%x, vid 0x%x\n",
1242                         data->currfid, data->currvid);
1243
1244         powernow_data[pol->cpu] = data;
1245
1246         return 0;
1247
1248 err_out:
1249         set_cpus_allowed(current, oldmask);
1250         powernow_k8_cpu_exit_acpi(data);
1251
1252         kfree(data);
1253         return -ENODEV;
1254 }
1255
1256 static int __devexit powernowk8_cpu_exit (struct cpufreq_policy *pol)
1257 {
1258         struct powernow_k8_data *data = powernow_data[pol->cpu];
1259
1260         if (!data)
1261                 return -EINVAL;
1262
1263         powernow_k8_cpu_exit_acpi(data);
1264
1265         cpufreq_frequency_table_put_attr(pol->cpu);
1266
1267         kfree(data->powernow_table);
1268         kfree(data);
1269
1270         return 0;
1271 }
1272
1273 static unsigned int powernowk8_get (unsigned int cpu)
1274 {
1275         struct powernow_k8_data *data;
1276         cpumask_t oldmask = current->cpus_allowed;
1277         unsigned int khz = 0;
1278
1279         data = powernow_data[first_cpu(cpu_core_map[cpu])];
1280
1281         if (!data)
1282                 return -EINVAL;
1283
1284         set_cpus_allowed(current, cpumask_of_cpu(cpu));
1285         if (smp_processor_id() != cpu) {
1286                 printk(KERN_ERR PFX "limiting to CPU %d failed in powernowk8_get\n", cpu);
1287                 set_cpus_allowed(current, oldmask);
1288                 return 0;
1289         }
1290
1291         if (query_current_values_with_pending_wait(data))
1292                 goto out;
1293
1294         if (cpu_family == CPU_HW_PSTATE)
1295                 khz = find_khz_freq_from_fiddid(data->currfid, data->currdid);
1296         else
1297                 khz = find_khz_freq_from_fid(data->currfid);
1298
1299
1300 out:
1301         set_cpus_allowed(current, oldmask);
1302         return khz;
1303 }
1304
1305 static struct freq_attr* powernow_k8_attr[] = {
1306         &cpufreq_freq_attr_scaling_available_freqs,
1307         NULL,
1308 };
1309
1310 static struct cpufreq_driver cpufreq_amd64_driver = {
1311         .verify = powernowk8_verify,
1312         .target = powernowk8_target,
1313         .init = powernowk8_cpu_init,
1314         .exit = __devexit_p(powernowk8_cpu_exit),
1315         .get = powernowk8_get,
1316         .name = "powernow-k8",
1317         .owner = THIS_MODULE,
1318         .attr = powernow_k8_attr,
1319 };
1320
1321 /* driver entry point for init */
1322 static int __cpuinit powernowk8_init(void)
1323 {
1324         unsigned int i, supported_cpus = 0;
1325
1326         for_each_online_cpu(i) {
1327                 if (check_supported_cpu(i))
1328                         supported_cpus++;
1329         }
1330
1331         if (supported_cpus == num_online_cpus()) {
1332                 printk(KERN_INFO PFX "Found %d %s "
1333                         "processors (" VERSION ")\n", supported_cpus,
1334                         boot_cpu_data.x86_model_id);
1335                 return cpufreq_register_driver(&cpufreq_amd64_driver);
1336         }
1337
1338         return -ENODEV;
1339 }
1340
1341 /* driver entry point for term */
1342 static void __exit powernowk8_exit(void)
1343 {
1344         dprintk("exit\n");
1345
1346         cpufreq_unregister_driver(&cpufreq_amd64_driver);
1347 }
1348
1349 MODULE_AUTHOR("Paul Devriendt <paul.devriendt@amd.com> and Mark Langsdorf <mark.langsdorf@amd.com>");
1350 MODULE_DESCRIPTION("AMD Athlon 64 and Opteron processor frequency driver.");
1351 MODULE_LICENSE("GPL");
1352
1353 late_initcall(powernowk8_init);
1354 module_exit(powernowk8_exit);