SAFE public projects git trees. - safe/jmp/linux-2.6/blob - arch/i386/kernel/cpu/cpufreq/powernow-k8.c

   1 /*
   2  *   (c) 2003, 2004 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 : paul.devriendt@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, and others.
  18  *  Processor information obtained from Chapter 9 (Power and Thermal Management)
  19  *  of the "BIOS and Kernel Developer's Guide for the AMD Athlon 64 and AMD
  20  *  Opteron Processors" available for download from www.amd.com
  21  *
  22  *  Tables for specific CPUs can be infrerred from
  23  *      http://www.amd.com/us-en/assets/content_type/white_papers_and_tech_docs/30430.pdf
  24  */
  25
  26 #include <linux/kernel.h>
  27 #include <linux/smp.h>
  28 #include <linux/module.h>
  29 #include <linux/init.h>
  30 #include <linux/cpufreq.h>
  31 #include <linux/slab.h>
  32 #include <linux/string.h>
  33
  34 #include <asm/msr.h>
  35 #include <asm/io.h>
  36 #include <asm/delay.h>
  37
  38 #ifdef CONFIG_X86_POWERNOW_K8_ACPI
  39 #include <linux/acpi.h>
  40 #include <acpi/processor.h>
  41 #endif
  42
  43 #define PFX "powernow-k8: "
  44 #define BFX PFX "BIOS error: "
  45 #define VERSION "version 1.00.09e"
  46 #include "powernow-k8.h"
  47
  48 /* serialize freq changes  */
  49 static DECLARE_MUTEX(fidvid_sem);
  50
  51 static struct powernow_k8_data *powernow_data[NR_CPUS];
  52
  53 /* Return a frequency in MHz, given an input fid */
  54 static u32 find_freq_from_fid(u32 fid)
  55 {
  56         return 800 + (fid * 100);
  57 }
  58
  59 /* Return a frequency in KHz, given an input fid */
  60 static u32 find_khz_freq_from_fid(u32 fid)
  61 {
  62         return 1000 * find_freq_from_fid(fid);
  63 }
  64
  65 /* Return a voltage in miliVolts, given an input vid */
  66 static u32 find_millivolts_from_vid(struct powernow_k8_data *data, u32 vid)
  67 {
  68         return 1550-vid*25;
  69 }
  70
  71 /* Return the vco fid for an input fid
  72  *
  73  * Each "low" fid has corresponding "high" fid, and you can get to "low" fids
  74  * only from corresponding high fids. This returns "high" fid corresponding to
  75  * "low" one.
  76  */
  77 static u32 convert_fid_to_vco_fid(u32 fid)
  78 {
  79         if (fid < HI_FID_TABLE_BOTTOM) {
  80                 return 8 + (2 * fid);
  81         } else {
  82                 return fid;
  83         }
  84 }
  85
  86 /*
  87  * Return 1 if the pending bit is set. Unless we just instructed the processor
  88  * to transition to a new state, seeing this bit set is really bad news.
  89  */
  90 static int pending_bit_stuck(void)
  91 {
  92         u32 lo, hi;
  93
  94         rdmsr(MSR_FIDVID_STATUS, lo, hi);
  95         return lo & MSR_S_LO_CHANGE_PENDING ? 1 : 0;
  96 }
  97
  98 /*
  99  * Update the global current fid / vid values from the status msr.
 100  * Returns 1 on error.
 101  */
 102 static int query_current_values_with_pending_wait(struct powernow_k8_data *data)
 103 {
 104         u32 lo, hi;
 105         u32 i = 0;
 106
 107         lo = MSR_S_LO_CHANGE_PENDING;
 108         while (lo & MSR_S_LO_CHANGE_PENDING) {
 109                 if (i++ > 0x1000000) {
 110                         printk(KERN_ERR PFX "detected change pending stuck\n");
 111                         return 1;
 112                 }
 113                 rdmsr(MSR_FIDVID_STATUS, lo, hi);
 114         }
 115
 116         data->currvid = hi & MSR_S_HI_CURRENT_VID;
 117         data->currfid = lo & MSR_S_LO_CURRENT_FID;
 118
 119         return 0;
 120 }
 121
 122 /* the isochronous relief time */
 123 static void count_off_irt(struct powernow_k8_data *data)
 124 {
 125         udelay((1 << data->irt) * 10);
 126         return;
 127 }
 128
 129 /* the voltage stabalization time */
 130 static void count_off_vst(struct powernow_k8_data *data)
 131 {
 132         udelay(data->vstable * VST_UNITS_20US);
 133         return;
 134 }
 135
 136 /* need to init the control msr to a safe value (for each cpu) */
 137 static void fidvid_msr_init(void)
 138 {
 139         u32 lo, hi;
 140         u8 fid, vid;
 141
 142         rdmsr(MSR_FIDVID_STATUS, lo, hi);
 143         vid = hi & MSR_S_HI_CURRENT_VID;
 144         fid = lo & MSR_S_LO_CURRENT_FID;
 145         lo = fid | (vid << MSR_C_LO_VID_SHIFT);
 146         hi = MSR_C_HI_STP_GNT_BENIGN;
 147         dprintk("cpu%d, init lo 0x%x, hi 0x%x\n", smp_processor_id(), lo, hi);
 148         wrmsr(MSR_FIDVID_CTL, lo, hi);
 149 }
 150
 151
 152 /* write the new fid value along with the other control fields to the msr */
 153 static int write_new_fid(struct powernow_k8_data *data, u32 fid)
 154 {
 155         u32 lo;
 156         u32 savevid = data->currvid;
 157
 158         if ((fid & INVALID_FID_MASK) || (data->currvid & INVALID_VID_MASK)) {
 159                 printk(KERN_ERR PFX "internal error - overflow on fid write\n");
 160                 return 1;
 161         }
 162
 163         lo = fid | (data->currvid << MSR_C_LO_VID_SHIFT) | MSR_C_LO_INIT_FID_VID;
 164
 165         dprintk("writing fid 0x%x, lo 0x%x, hi 0x%x\n",
 166                 fid, lo, data->plllock * PLL_LOCK_CONVERSION);
 167
 168         wrmsr(MSR_FIDVID_CTL, lo, data->plllock * PLL_LOCK_CONVERSION);
 169
 170         if (query_current_values_with_pending_wait(data))
 171                 return 1;
 172
 173         count_off_irt(data);
 174
 175         if (savevid != data->currvid) {
 176                 printk(KERN_ERR PFX "vid change on fid trans, old 0x%x, new 0x%x\n",
 177                        savevid, data->currvid);
 178                 return 1;
 179         }
 180
 181         if (fid != data->currfid) {
 182                 printk(KERN_ERR PFX "fid trans failed, fid 0x%x, curr 0x%x\n", fid,
 183                         data->currfid);
 184                 return 1;
 185         }
 186
 187         return 0;
 188 }
 189
 190 /* Write a new vid to the hardware */
 191 static int write_new_vid(struct powernow_k8_data *data, u32 vid)
 192 {
 193         u32 lo;
 194         u32 savefid = data->currfid;
 195
 196         if ((data->currfid & INVALID_FID_MASK) || (vid & INVALID_VID_MASK)) {
 197                 printk(KERN_ERR PFX "internal error - overflow on vid write\n");
 198                 return 1;
 199         }
 200
 201         lo = data->currfid | (vid << MSR_C_LO_VID_SHIFT) | MSR_C_LO_INIT_FID_VID;
 202
 203         dprintk("writing vid 0x%x, lo 0x%x, hi 0x%x\n",
 204                 vid, lo, STOP_GRANT_5NS);
 205
 206         wrmsr(MSR_FIDVID_CTL, lo, STOP_GRANT_5NS);
 207
 208         if (query_current_values_with_pending_wait(data))
 209                 return 1;
 210
 211         if (savefid != data->currfid) {
 212                 printk(KERN_ERR PFX "fid changed on vid trans, old 0x%x new 0x%x\n",
 213                        savefid, data->currfid);
 214                 return 1;
 215         }
 216
 217         if (vid != data->currvid) {
 218                 printk(KERN_ERR PFX "vid trans failed, vid 0x%x, curr 0x%x\n", vid,
 219                                 data->currvid);
 220                 return 1;
 221         }
 222
 223         return 0;
 224 }
 225
 226 /*
 227  * Reduce the vid by the max of step or reqvid.
 228  * Decreasing vid codes represent increasing voltages:
 229  * vid of 0 is 1.550V, vid of 0x1e is 0.800V, vid of 0x1f is off.
 230  */
 231 static int decrease_vid_code_by_step(struct powernow_k8_data *data, u32 reqvid, u32 step)
 232 {
 233         if ((data->currvid - reqvid) > step)
 234                 reqvid = data->currvid - step;
 235
 236         if (write_new_vid(data, reqvid))
 237                 return 1;
 238
 239         count_off_vst(data);
 240
 241         return 0;
 242 }
 243
 244 /* Change the fid and vid, by the 3 phases. */
 245 static int transition_fid_vid(struct powernow_k8_data *data, u32 reqfid, u32 reqvid)
 246 {
 247         if (core_voltage_pre_transition(data, reqvid))
 248                 return 1;
 249
 250         if (core_frequency_transition(data, reqfid))
 251                 return 1;
 252
 253         if (core_voltage_post_transition(data, reqvid))
 254                 return 1;
 255
 256         if (query_current_values_with_pending_wait(data))
 257                 return 1;
 258
 259         if ((reqfid != data->currfid) || (reqvid != data->currvid)) {
 260                 printk(KERN_ERR PFX "failed (cpu%d): req 0x%x 0x%x, curr 0x%x 0x%x\n",
 261                                 smp_processor_id(),
 262                                 reqfid, reqvid, data->currfid, data->currvid);
 263                 return 1;
 264         }
 265
 266         dprintk("transitioned (cpu%d): new fid 0x%x, vid 0x%x\n",
 267                 smp_processor_id(), data->currfid, data->currvid);
 268
 269         return 0;
 270 }
 271
 272 /* Phase 1 - core voltage transition ... setup voltage */
 273 static int core_voltage_pre_transition(struct powernow_k8_data *data, u32 reqvid)
 274 {
 275         u32 rvosteps = data->rvo;
 276         u32 savefid = data->currfid;
 277
 278         dprintk("ph1 (cpu%d): start, currfid 0x%x, currvid 0x%x, reqvid 0x%x, rvo 0x%x\n",
 279                 smp_processor_id(),
 280                 data->currfid, data->currvid, reqvid, data->rvo);
 281
 282         while (data->currvid > reqvid) {
 283                 dprintk("ph1: curr 0x%x, req vid 0x%x\n",
 284                         data->currvid, reqvid);
 285                 if (decrease_vid_code_by_step(data, reqvid, data->vidmvs))
 286                         return 1;
 287         }
 288
 289         while ((rvosteps > 0)  && ((data->rvo + data->currvid) > reqvid)) {
 290                 if (data->currvid == 0) {
 291                         rvosteps = 0;
 292                 } else {
 293                         dprintk("ph1: changing vid for rvo, req 0x%x\n",
 294                                 data->currvid - 1);
 295                         if (decrease_vid_code_by_step(data, data->currvid - 1, 1))
 296                                 return 1;
 297                         rvosteps--;
 298                 }
 299         }
 300
 301         if (query_current_values_with_pending_wait(data))
 302                 return 1;
 303
 304         if (savefid != data->currfid) {
 305                 printk(KERN_ERR PFX "ph1 err, currfid changed 0x%x\n", data->currfid);
 306                 return 1;
 307         }
 308
 309         dprintk("ph1 complete, currfid 0x%x, currvid 0x%x\n",
 310                 data->currfid, data->currvid);
 311
 312         return 0;
 313 }
 314
 315 /* Phase 2 - core frequency transition */
 316 static int core_frequency_transition(struct powernow_k8_data *data, u32 reqfid)
 317 {
 318         u32 vcoreqfid, vcocurrfid, vcofiddiff, savevid = data->currvid;
 319
 320         if ((reqfid < HI_FID_TABLE_BOTTOM) && (data->currfid < HI_FID_TABLE_BOTTOM)) {
 321                 printk(KERN_ERR PFX "ph2: illegal lo-lo transition 0x%x 0x%x\n",
 322                         reqfid, data->currfid);
 323                 return 1;
 324         }
 325
 326         if (data->currfid == reqfid) {
 327                 printk(KERN_ERR PFX "ph2 null fid transition 0x%x\n", data->currfid);
 328                 return 0;
 329         }
 330
 331         dprintk("ph2 (cpu%d): starting, currfid 0x%x, currvid 0x%x, reqfid 0x%x\n",
 332                 smp_processor_id(),
 333                 data->currfid, data->currvid, reqfid);
 334
 335         vcoreqfid = convert_fid_to_vco_fid(reqfid);
 336         vcocurrfid = convert_fid_to_vco_fid(data->currfid);
 337         vcofiddiff = vcocurrfid > vcoreqfid ? vcocurrfid - vcoreqfid
 338             : vcoreqfid - vcocurrfid;
 339
 340         while (vcofiddiff > 2) {
 341                 if (reqfid > data->currfid) {
 342                         if (data->currfid > LO_FID_TABLE_TOP) {
 343                                 if (write_new_fid(data, data->currfid + 2)) {
 344                                         return 1;
 345                                 }
 346                         } else {
 347                                 if (write_new_fid
 348                                     (data, 2 + convert_fid_to_vco_fid(data->currfid))) {
 349                                         return 1;
 350                                 }
 351                         }
 352                 } else {
 353                         if (write_new_fid(data, data->currfid - 2))
 354                                 return 1;
 355                 }
 356
 357                 vcocurrfid = convert_fid_to_vco_fid(data->currfid);
 358                 vcofiddiff = vcocurrfid > vcoreqfid ? vcocurrfid - vcoreqfid
 359                     : vcoreqfid - vcocurrfid;
 360         }
 361
 362         if (write_new_fid(data, reqfid))
 363                 return 1;
 364
 365         if (query_current_values_with_pending_wait(data))
 366                 return 1;
 367
 368         if (data->currfid != reqfid) {
 369                 printk(KERN_ERR PFX
 370                         "ph2: mismatch, failed fid transition, curr 0x%x, req 0x%x\n",
 371                         data->currfid, reqfid);
 372                 return 1;
 373         }
 374
 375         if (savevid != data->currvid) {
 376                 printk(KERN_ERR PFX "ph2: vid changed, save 0x%x, curr 0x%x\n",
 377                         savevid, data->currvid);
 378                 return 1;
 379         }
 380
 381         dprintk("ph2 complete, currfid 0x%x, currvid 0x%x\n",
 382                 data->currfid, data->currvid);
 383
 384         return 0;
 385 }
 386
 387 /* Phase 3 - core voltage transition flow ... jump to the final vid. */
 388 static int core_voltage_post_transition(struct powernow_k8_data *data, u32 reqvid)
 389 {
 390         u32 savefid = data->currfid;
 391         u32 savereqvid = reqvid;
 392
 393         dprintk("ph3 (cpu%d): starting, currfid 0x%x, currvid 0x%x\n",
 394                 smp_processor_id(),
 395                 data->currfid, data->currvid);
 396
 397         if (reqvid != data->currvid) {
 398                 if (write_new_vid(data, reqvid))
 399                         return 1;
 400
 401                 if (savefid != data->currfid) {
 402                         printk(KERN_ERR PFX
 403                                "ph3: bad fid change, save 0x%x, curr 0x%x\n",
 404                                savefid, data->currfid);
 405                         return 1;
 406                 }
 407
 408                 if (data->currvid != reqvid) {
 409                         printk(KERN_ERR PFX
 410                                "ph3: failed vid transition\n, req 0x%x, curr 0x%x",
 411                                reqvid, data->currvid);
 412                         return 1;
 413                 }
 414         }
 415
 416         if (query_current_values_with_pending_wait(data))
 417                 return 1;
 418
 419         if (savereqvid != data->currvid) {
 420                 dprintk("ph3 failed, currvid 0x%x\n", data->currvid);
 421                 return 1;
 422         }
 423
 424         if (savefid != data->currfid) {
 425                 dprintk("ph3 failed, currfid changed 0x%x\n",
 426                         data->currfid);
 427                 return 1;
 428         }
 429
 430         dprintk("ph3 complete, currfid 0x%x, currvid 0x%x\n",
 431                 data->currfid, data->currvid);
 432
 433         return 0;
 434 }
 435
 436 static int check_supported_cpu(unsigned int cpu)
 437 {
 438         cpumask_t oldmask = CPU_MASK_ALL;
 439         u32 eax, ebx, ecx, edx;
 440         unsigned int rc = 0;
 441
 442         oldmask = current->cpus_allowed;
 443         set_cpus_allowed(current, cpumask_of_cpu(cpu));
 444         schedule();
 445
 446         if (smp_processor_id() != cpu) {
 447                 printk(KERN_ERR "limiting to cpu %u failed\n", cpu);
 448                 goto out;
 449         }
 450
 451         if (current_cpu_data.x86_vendor != X86_VENDOR_AMD)
 452                 goto out;
 453
 454         eax = cpuid_eax(CPUID_PROCESSOR_SIGNATURE);
 455         if (((eax & CPUID_USE_XFAM_XMOD) != CPUID_USE_XFAM_XMOD) ||
 456             ((eax & CPUID_XFAM) != CPUID_XFAM_K8) ||
 457             ((eax & CPUID_XMOD) > CPUID_XMOD_REV_E)) {
 458                 printk(KERN_INFO PFX "Processor cpuid %x not supported\n", eax);
 459                 goto out;
 460         }
 461
 462         eax = cpuid_eax(CPUID_GET_MAX_CAPABILITIES);
 463         if (eax < CPUID_FREQ_VOLT_CAPABILITIES) {
 464                 printk(KERN_INFO PFX
 465                        "No frequency change capabilities detected\n");
 466                 goto out;
 467         }
 468
 469         cpuid(CPUID_FREQ_VOLT_CAPABILITIES, &eax, &ebx, &ecx, &edx);
 470         if ((edx & P_STATE_TRANSITION_CAPABLE) != P_STATE_TRANSITION_CAPABLE) {
 471                 printk(KERN_INFO PFX "Power state transitions not supported\n");
 472                 goto out;
 473         }
 474
 475         rc = 1;
 476
 477 out:
 478         set_cpus_allowed(current, oldmask);
 479         schedule();
 480         return rc;
 481
 482 }
 483
 484 static int check_pst_table(struct powernow_k8_data *data, struct pst_s *pst, u8 maxvid)
 485 {
 486         unsigned int j;
 487         u8 lastfid = 0xff;
 488
 489         for (j = 0; j < data->numps; j++) {
 490                 if (pst[j].vid > LEAST_VID) {
 491                         printk(KERN_ERR PFX "vid %d invalid : 0x%x\n", j, pst[j].vid);
 492                         return -EINVAL;
 493                 }
 494                 if (pst[j].vid < data->rvo) {   /* vid + rvo >= 0 */
 495                         printk(KERN_ERR BFX "0 vid exceeded with pstate %d\n", j);
 496                         return -ENODEV;
 497                 }
 498                 if (pst[j].vid < maxvid + data->rvo) {  /* vid + rvo >= maxvid */
 499                         printk(KERN_ERR BFX "maxvid exceeded with pstate %d\n", j);
 500                         return -ENODEV;
 501                 }
 502                 if ((pst[j].fid > MAX_FID)
 503                     || (pst[j].fid & 1)
 504                     || (j && (pst[j].fid < HI_FID_TABLE_BOTTOM))) {
 505                         /* Only first fid is allowed to be in "low" range */
 506                         printk(KERN_ERR PFX "two low fids - %d : 0x%x\n", j, pst[j].fid);
 507                         return -EINVAL;
 508                 }
 509                 if (pst[j].fid < lastfid)
 510                         lastfid = pst[j].fid;
 511         }
 512         if (lastfid & 1) {
 513                 printk(KERN_ERR PFX "lastfid invalid\n");
 514                 return -EINVAL;
 515         }
 516         if (lastfid > LO_FID_TABLE_TOP)
 517                 printk(KERN_INFO PFX  "first fid not from lo freq table\n");
 518
 519         return 0;
 520 }
 521
 522 static void print_basics(struct powernow_k8_data *data)
 523 {
 524         int j;
 525         for (j = 0; j < data->numps; j++) {
 526                 if (data->powernow_table[j].frequency != CPUFREQ_ENTRY_INVALID)
 527                         printk(KERN_INFO PFX "   %d : fid 0x%x (%d MHz), vid 0x%x (%d mV)\n", j,
 528                                 data->powernow_table[j].index & 0xff,
 529                                 data->powernow_table[j].frequency/1000,
 530                                 data->powernow_table[j].index >> 8,
 531                                 find_millivolts_from_vid(data, data->powernow_table[j].index >> 8));
 532         }
 533         if (data->batps)
 534                 printk(KERN_INFO PFX "Only %d pstates on battery\n", data->batps);
 535 }
 536
 537 static int fill_powernow_table(struct powernow_k8_data *data, struct pst_s *pst, u8 maxvid)
 538 {
 539         struct cpufreq_frequency_table *powernow_table;
 540         unsigned int j;
 541
 542         if (data->batps) {    /* use ACPI support to get full speed on mains power */
 543                 printk(KERN_WARNING PFX "Only %d pstates usable (use ACPI driver for full range\n", data->batps);
 544                 data->numps = data->batps;
 545         }
 546
 547         for ( j=1; j<data->numps; j++ ) {
 548                 if (pst[j-1].fid >= pst[j].fid) {
 549                         printk(KERN_ERR PFX "PST out of sequence\n");
 550                         return -EINVAL;
 551                 }
 552         }
 553
 554         if (data->numps < 2) {
 555                 printk(KERN_ERR PFX "no p states to transition\n");
 556                 return -ENODEV;
 557         }
 558
 559         if (check_pst_table(data, pst, maxvid))
 560                 return -EINVAL;
 561
 562         powernow_table = kmalloc((sizeof(struct cpufreq_frequency_table)
 563                 * (data->numps + 1)), GFP_KERNEL);
 564         if (!powernow_table) {
 565                 printk(KERN_ERR PFX "powernow_table memory alloc failure\n");
 566                 return -ENOMEM;
 567         }
 568
 569         for (j = 0; j < data->numps; j++) {
 570                 powernow_table[j].index = pst[j].fid; /* lower 8 bits */
 571                 powernow_table[j].index |= (pst[j].vid << 8); /* upper 8 bits */
 572                 powernow_table[j].frequency = find_khz_freq_from_fid(pst[j].fid);
 573         }
 574         powernow_table[data->numps].frequency = CPUFREQ_TABLE_END;
 575         powernow_table[data->numps].index = 0;
 576
 577         if (query_current_values_with_pending_wait(data)) {
 578                 kfree(powernow_table);
 579                 return -EIO;
 580         }
 581
 582         dprintk("cfid 0x%x, cvid 0x%x\n", data->currfid, data->currvid);
 583         data->powernow_table = powernow_table;
 584         print_basics(data);
 585
 586         for (j = 0; j < data->numps; j++)
 587                 if ((pst[j].fid==data->currfid) && (pst[j].vid==data->currvid))
 588                         return 0;
 589
 590         dprintk("currfid/vid do not match PST, ignoring\n");
 591         return 0;
 592 }
 593
 594 /* Find and validate the PSB/PST table in BIOS. */
 595 static int find_psb_table(struct powernow_k8_data *data)
 596 {
 597         struct psb_s *psb;
 598         unsigned int i;
 599         u32 mvs;
 600         u8 maxvid;
 601         u32 cpst = 0;
 602         u32 thiscpuid;
 603
 604         for (i = 0xc0000; i < 0xffff0; i += 0x10) {
 605                 /* Scan BIOS looking for the signature. */
 606                 /* It can not be at ffff0 - it is too big. */
 607
 608                 psb = phys_to_virt(i);
 609                 if (memcmp(psb, PSB_ID_STRING, PSB_ID_STRING_LEN) != 0)
 610                         continue;
 611
 612                 dprintk("found PSB header at 0x%p\n", psb);
 613
 614                 dprintk("table vers: 0x%x\n", psb->tableversion);
 615                 if (psb->tableversion != PSB_VERSION_1_4) {
 616                         printk(KERN_INFO BFX "PSB table is not v1.4\n");
 617                         return -ENODEV;
 618                 }
 619
 620                 dprintk("flags: 0x%x\n", psb->flags1);
 621                 if (psb->flags1) {
 622                         printk(KERN_ERR BFX "unknown flags\n");
 623                         return -ENODEV;
 624                 }
 625
 626                 data->vstable = psb->vstable;
 627                 dprintk("voltage stabilization time: %d(*20us)\n", data->vstable);
 628
 629                 dprintk("flags2: 0x%x\n", psb->flags2);
 630                 data->rvo = psb->flags2 & 3;
 631                 data->irt = ((psb->flags2) >> 2) & 3;
 632                 mvs = ((psb->flags2) >> 4) & 3;
 633                 data->vidmvs = 1 << mvs;
 634                 data->batps = ((psb->flags2) >> 6) & 3;
 635
 636                 dprintk("ramp voltage offset: %d\n", data->rvo);
 637                 dprintk("isochronous relief time: %d\n", data->irt);
 638                 dprintk("maximum voltage step: %d - 0x%x\n", mvs, data->vidmvs);
 639
 640                 dprintk("numpst: 0x%x\n", psb->num_tables);
 641                 cpst = psb->num_tables;
 642                 if ((psb->cpuid == 0x00000fc0) || (psb->cpuid == 0x00000fe0) ){
 643                         thiscpuid = cpuid_eax(CPUID_PROCESSOR_SIGNATURE);
 644                         if ((thiscpuid == 0x00000fc0) || (thiscpuid == 0x00000fe0) ) {
 645                                 cpst = 1;
 646                         }
 647                 }
 648                 if (cpst != 1) {
 649                         printk(KERN_ERR BFX "numpst must be 1\n");
 650                         return -ENODEV;
 651                 }
 652
 653                 data->plllock = psb->plllocktime;
 654                 dprintk("plllocktime: 0x%x (units 1us)\n", psb->plllocktime);
 655                 dprintk("maxfid: 0x%x\n", psb->maxfid);
 656                 dprintk("maxvid: 0x%x\n", psb->maxvid);
 657                 maxvid = psb->maxvid;
 658
 659                 data->numps = psb->numps;
 660                 dprintk("numpstates: 0x%x\n", data->numps);
 661                 return fill_powernow_table(data, (struct pst_s *)(psb+1), maxvid);
 662         }
 663         /*
 664          * If you see this message, complain to BIOS manufacturer. If
 665          * he tells you "we do not support Linux" or some similar
 666          * nonsense, remember that Windows 2000 uses the same legacy
 667          * mechanism that the old Linux PSB driver uses. Tell them it
 668          * is broken with Windows 2000.
 669          *
 670          * The reference to the AMD documentation is chapter 9 in the
 671          * BIOS and Kernel Developer's Guide, which is available on
 672          * www.amd.com
 673          */
 674         printk(KERN_ERR PFX "BIOS error - no PSB\n");
 675         return -ENODEV;
 676 }
 677
 678 #ifdef CONFIG_X86_POWERNOW_K8_ACPI
 679 static void powernow_k8_acpi_pst_values(struct powernow_k8_data *data, unsigned int index)
 680 {
 681         if (!data->acpi_data.state_count)
 682                 return;
 683
 684         data->irt = (data->acpi_data.states[index].control >> IRT_SHIFT) & IRT_MASK;
 685         data->rvo = (data->acpi_data.states[index].control >> RVO_SHIFT) & RVO_MASK;
 686         data->plllock = (data->acpi_data.states[index].control >> PLL_L_SHIFT) & PLL_L_MASK;
 687         data->vidmvs = 1 << ((data->acpi_data.states[index].control >> MVS_SHIFT) & MVS_MASK);
 688         data->vstable = (data->acpi_data.states[index].control >> VST_SHIFT) & VST_MASK;
 689 }
 690
 691 static int powernow_k8_cpu_init_acpi(struct powernow_k8_data *data)
 692 {
 693         int i;
 694         int cntlofreq = 0;
 695         struct cpufreq_frequency_table *powernow_table;
 696
 697         if (acpi_processor_register_performance(&data->acpi_data, data->cpu)) {
 698                 dprintk("register performance failed\n");
 699                 return -EIO;
 700         }
 701
 702         /* verify the data contained in the ACPI structures */
 703         if (data->acpi_data.state_count <= 1) {
 704                 dprintk("No ACPI P-States\n");
 705                 goto err_out;
 706         }
 707
 708         if ((data->acpi_data.control_register.space_id != ACPI_ADR_SPACE_FIXED_HARDWARE) ||
 709                 (data->acpi_data.status_register.space_id != ACPI_ADR_SPACE_FIXED_HARDWARE)) {
 710                 dprintk("Invalid control/status registers (%x - %x)\n",
 711                         data->acpi_data.control_register.space_id,
 712                         data->acpi_data.status_register.space_id);
 713                 goto err_out;
 714         }
 715
 716         /* fill in data->powernow_table */
 717         powernow_table = kmalloc((sizeof(struct cpufreq_frequency_table)
 718                 * (data->acpi_data.state_count + 1)), GFP_KERNEL);
 719         if (!powernow_table) {
 720                 dprintk("powernow_table memory alloc failure\n");
 721                 goto err_out;
 722         }
 723
 724         for (i = 0; i < data->acpi_data.state_count; i++) {
 725                 u32 fid = data->acpi_data.states[i].control & FID_MASK;
 726                 u32 vid = (data->acpi_data.states[i].control >> VID_SHIFT) & VID_MASK;
 727
 728                 dprintk("   %d : fid 0x%x, vid 0x%x\n", i, fid, vid);
 729
 730                 powernow_table[i].index = fid; /* lower 8 bits */
 731                 powernow_table[i].index |= (vid << 8); /* upper 8 bits */
 732                 powernow_table[i].frequency = find_khz_freq_from_fid(fid);
 733
 734                 /* verify frequency is OK */
 735                 if ((powernow_table[i].frequency > (MAX_FREQ * 1000)) ||
 736                         (powernow_table[i].frequency < (MIN_FREQ * 1000))) {
 737                         dprintk("invalid freq %u kHz, ignoring\n", powernow_table[i].frequency);
 738                         powernow_table[i].frequency = CPUFREQ_ENTRY_INVALID;
 739                         continue;
 740                 }
 741
 742                 /* verify voltage is OK - BIOSs are using "off" to indicate invalid */
 743                 if (vid == 0x1f) {
 744                         dprintk("invalid vid %u, ignoring\n", vid);
 745                         powernow_table[i].frequency = CPUFREQ_ENTRY_INVALID;
 746                         continue;
 747                 }
 748
 749                 if (fid < HI_FID_TABLE_BOTTOM) {
 750                         if (cntlofreq) {
 751                                 /* if both entries are the same, ignore this
 752                                  * one...
 753                                  */
 754                                 if ((powernow_table[i].frequency != powernow_table[cntlofreq].frequency) ||
 755                                     (powernow_table[i].index != powernow_table[cntlofreq].index)) {
 756                                         printk(KERN_ERR PFX "Too many lo freq table entries\n");
 757                                         goto err_out_mem;
 758                                 }
 759
 760                                 dprintk("double low frequency table entry, ignoring it.\n");
 761                                 powernow_table[i].frequency = CPUFREQ_ENTRY_INVALID;
 762                                 continue;
 763                         } else
 764                                 cntlofreq = i;
 765                 }
 766
 767                 if (powernow_table[i].frequency != (data->acpi_data.states[i].core_frequency * 1000)) {
 768                         printk(KERN_INFO PFX "invalid freq entries %u kHz vs. %u kHz\n",
 769                                 powernow_table[i].frequency,
 770                                 (unsigned int) (data->acpi_data.states[i].core_frequency * 1000));
 771                         powernow_table[i].frequency = CPUFREQ_ENTRY_INVALID;
 772                         continue;
 773                 }
 774         }
 775
 776         powernow_table[data->acpi_data.state_count].frequency = CPUFREQ_TABLE_END;
 777         powernow_table[data->acpi_data.state_count].index = 0;
 778         data->powernow_table = powernow_table;
 779
 780         /* fill in data */
 781         data->numps = data->acpi_data.state_count;
 782         print_basics(data);
 783         powernow_k8_acpi_pst_values(data, 0);
 784
 785         /* notify BIOS that we exist */
 786         acpi_processor_notify_smm(THIS_MODULE);
 787
 788         return 0;
 789
 790 err_out_mem:
 791         kfree(powernow_table);
 792
 793 err_out:
 794         acpi_processor_unregister_performance(&data->acpi_data, data->cpu);
 795
 796         /* data->acpi_data.state_count informs us at ->exit() whether ACPI was used */
 797         data->acpi_data.state_count = 0;
 798
 799         return -ENODEV;
 800 }
 801
 802 static void powernow_k8_cpu_exit_acpi(struct powernow_k8_data *data)
 803 {
 804         if (data->acpi_data.state_count)
 805                 acpi_processor_unregister_performance(&data->acpi_data, data->cpu);
 806 }
 807
 808 #else
 809 static int powernow_k8_cpu_init_acpi(struct powernow_k8_data *data) { return -ENODEV; }
 810 static void powernow_k8_cpu_exit_acpi(struct powernow_k8_data *data) { return; }
 811 static void powernow_k8_acpi_pst_values(struct powernow_k8_data *data, unsigned int index) { return; }
 812 #endif /* CONFIG_X86_POWERNOW_K8_ACPI */
 813
 814 /* Take a frequency, and issue the fid/vid transition command */
 815 static int transition_frequency(struct powernow_k8_data *data, unsigned int index)
 816 {
 817         u32 fid;
 818         u32 vid;
 819         int res;
 820         struct cpufreq_freqs freqs;
 821
 822         dprintk("cpu %d transition to index %u\n", smp_processor_id(), index);
 823
 824         /* fid are the lower 8 bits of the index we stored into
 825          * the cpufreq frequency table in find_psb_table, vid are
 826          * the upper 8 bits.
 827          */
 828
 829         fid = data->powernow_table[index].index & 0xFF;
 830         vid = (data->powernow_table[index].index & 0xFF00) >> 8;
 831
 832         dprintk("table matched fid 0x%x, giving vid 0x%x\n", fid, vid);
 833
 834         if (query_current_values_with_pending_wait(data))
 835                 return 1;
 836
 837         if ((data->currvid == vid) && (data->currfid == fid)) {
 838                 dprintk("target matches current values (fid 0x%x, vid 0x%x)\n",
 839                         fid, vid);
 840                 return 0;
 841         }
 842
 843         if ((fid < HI_FID_TABLE_BOTTOM) && (data->currfid < HI_FID_TABLE_BOTTOM)) {
 844                 printk("ignoring illegal change in lo freq table-%x to 0x%x\n",
 845                        data->currfid, fid);
 846                 return 1;
 847         }
 848
 849         dprintk("cpu %d, changing to fid 0x%x, vid 0x%x\n",
 850                 smp_processor_id(), fid, vid);
 851
 852         freqs.cpu = data->cpu;
 853
 854         freqs.old = find_khz_freq_from_fid(data->currfid);
 855         freqs.new = find_khz_freq_from_fid(fid);
 856         cpufreq_notify_transition(&freqs, CPUFREQ_PRECHANGE);
 857
 858         down(&fidvid_sem);
 859         res = transition_fid_vid(data, fid, vid);
 860         up(&fidvid_sem);
 861
 862         freqs.new = find_khz_freq_from_fid(data->currfid);
 863         cpufreq_notify_transition(&freqs, CPUFREQ_POSTCHANGE);
 864
 865         return res;
 866 }
 867
 868 /* Driver entry point to switch to the target frequency */
 869 static int powernowk8_target(struct cpufreq_policy *pol, unsigned targfreq, unsigned relation)
 870 {
 871         cpumask_t oldmask = CPU_MASK_ALL;
 872         struct powernow_k8_data *data = powernow_data[pol->cpu];
 873         u32 checkfid = data->currfid;
 874         u32 checkvid = data->currvid;
 875         unsigned int newstate;
 876         int ret = -EIO;
 877
 878         /* only run on specific CPU from here on */
 879         oldmask = current->cpus_allowed;
 880         set_cpus_allowed(current, cpumask_of_cpu(pol->cpu));
 881         schedule();
 882
 883         if (smp_processor_id() != pol->cpu) {
 884                 printk(KERN_ERR "limiting to cpu %u failed\n", pol->cpu);
 885                 goto err_out;
 886         }
 887
 888         if (pending_bit_stuck()) {
 889                 printk(KERN_ERR PFX "failing targ, change pending bit set\n");
 890                 goto err_out;
 891         }
 892
 893         dprintk("targ: cpu %d, %d kHz, min %d, max %d, relation %d\n",
 894                 pol->cpu, targfreq, pol->min, pol->max, relation);
 895
 896         if (query_current_values_with_pending_wait(data)) {
 897                 ret = -EIO;
 898                 goto err_out;
 899         }
 900
 901         dprintk("targ: curr fid 0x%x, vid 0x%x\n",
 902                 data->currfid, data->currvid);
 903
 904         if ((checkvid != data->currvid) || (checkfid != data->currfid)) {
 905                 printk(KERN_ERR PFX
 906                        "error - out of sync, fid 0x%x 0x%x, vid 0x%x 0x%x\n",
 907                        checkfid, data->currfid, checkvid, data->currvid);
 908         }
 909
 910         if (cpufreq_frequency_table_target(pol, data->powernow_table, targfreq, relation, &newstate))
 911                 goto err_out;
 912
 913         powernow_k8_acpi_pst_values(data, newstate);
 914
 915         if (transition_frequency(data, newstate)) {
 916                 printk(KERN_ERR PFX "transition frequency failed\n");
 917                 ret = 1;
 918                 goto err_out;
 919         }
 920
 921         pol->cur = find_khz_freq_from_fid(data->currfid);
 922         ret = 0;
 923
 924 err_out:
 925         set_cpus_allowed(current, oldmask);
 926         schedule();
 927
 928         return ret;
 929 }
 930
 931 /* Driver entry point to verify the policy and range of frequencies */
 932 static int powernowk8_verify(struct cpufreq_policy *pol)
 933 {
 934         struct powernow_k8_data *data = powernow_data[pol->cpu];
 935
 936         return cpufreq_frequency_table_verify(pol, data->powernow_table);
 937 }
 938
 939 /* per CPU init entry point to the driver */
 940 static int __init powernowk8_cpu_init(struct cpufreq_policy *pol)
 941 {
 942         struct powernow_k8_data *data;
 943         cpumask_t oldmask = CPU_MASK_ALL;
 944         int rc;
 945
 946         if (!check_supported_cpu(pol->cpu))
 947                 return -ENODEV;
 948
 949         data = kmalloc(sizeof(struct powernow_k8_data), GFP_KERNEL);
 950         if (!data) {
 951                 printk(KERN_ERR PFX "unable to alloc powernow_k8_data");
 952                 return -ENOMEM;
 953         }
 954         memset(data,0,sizeof(struct powernow_k8_data));
 955
 956         data->cpu = pol->cpu;
 957
 958         if (powernow_k8_cpu_init_acpi(data)) {
 959                 /*
 960                  * Use the PSB BIOS structure. This is only availabe on
 961                  * an UP version, and is deprecated by AMD.
 962                  */
 963
 964                 if ((num_online_cpus() != 1) || (num_possible_cpus() != 1)) {
 965                         printk(KERN_INFO PFX "MP systems not supported by PSB BIOS structure\n");
 966                         kfree(data);
 967                         return -ENODEV;
 968                 }
 969                 if (pol->cpu != 0) {
 970                         printk(KERN_ERR PFX "init not cpu 0\n");
 971                         kfree(data);
 972                         return -ENODEV;
 973                 }
 974                 rc = find_psb_table(data);
 975                 if (rc) {
 976                         kfree(data);
 977                         return -ENODEV;
 978                 }
 979         }
 980
 981         /* only run on specific CPU from here on */
 982         oldmask = current->cpus_allowed;
 983         set_cpus_allowed(current, cpumask_of_cpu(pol->cpu));
 984         schedule();
 985
 986         if (smp_processor_id() != pol->cpu) {
 987                 printk(KERN_ERR "limiting to cpu %u failed\n", pol->cpu);
 988                 goto err_out;
 989         }
 990
 991         if (pending_bit_stuck()) {
 992                 printk(KERN_ERR PFX "failing init, change pending bit set\n");
 993                 goto err_out;
 994         }
 995
 996         if (query_current_values_with_pending_wait(data))
 997                 goto err_out;
 998
 999         fidvid_msr_init();
1000
1001         /* run on any CPU again */
1002         set_cpus_allowed(current, oldmask);
1003         schedule();
1004
1005         pol->governor = CPUFREQ_DEFAULT_GOVERNOR;
1006
1007         /* Take a crude guess here.
1008          * That guess was in microseconds, so multiply with 1000 */
1009         pol->cpuinfo.transition_latency = (((data->rvo + 8) * data->vstable * VST_UNITS_20US)
1010             + (3 * (1 << data->irt) * 10)) * 1000;
1011
1012         pol->cur = find_khz_freq_from_fid(data->currfid);
1013         dprintk("policy current frequency %d kHz\n", pol->cur);
1014
1015         /* min/max the cpu is capable of */
1016         if (cpufreq_frequency_table_cpuinfo(pol, data->powernow_table)) {
1017                 printk(KERN_ERR PFX "invalid powernow_table\n");
1018                 powernow_k8_cpu_exit_acpi(data);
1019                 kfree(data->powernow_table);
1020                 kfree(data);
1021                 return -EINVAL;
1022         }
1023
1024         cpufreq_frequency_table_get_attr(data->powernow_table, pol->cpu);
1025
1026         printk("cpu_init done, current fid 0x%x, vid 0x%x\n",
1027                data->currfid, data->currvid);
1028
1029         powernow_data[pol->cpu] = data;
1030
1031         return 0;
1032
1033 err_out:
1034         set_cpus_allowed(current, oldmask);
1035         schedule();
1036         powernow_k8_cpu_exit_acpi(data);
1037
1038         kfree(data);
1039         return -ENODEV;
1040 }
1041
1042 static int __devexit powernowk8_cpu_exit (struct cpufreq_policy *pol)
1043 {
1044         struct powernow_k8_data *data = powernow_data[pol->cpu];
1045
1046         if (!data)
1047                 return -EINVAL;
1048
1049         powernow_k8_cpu_exit_acpi(data);
1050
1051         cpufreq_frequency_table_put_attr(pol->cpu);
1052
1053         kfree(data->powernow_table);
1054         kfree(data);
1055
1056         return 0;
1057 }
1058
1059 static unsigned int powernowk8_get (unsigned int cpu)
1060 {
1061         struct powernow_k8_data *data = powernow_data[cpu];
1062         cpumask_t oldmask = current->cpus_allowed;
1063         unsigned int khz = 0;
1064
1065         set_cpus_allowed(current, cpumask_of_cpu(cpu));
1066         if (smp_processor_id() != cpu) {
1067                 printk(KERN_ERR PFX "limiting to CPU %d failed in powernowk8_get\n", cpu);
1068                 set_cpus_allowed(current, oldmask);
1069                 return 0;
1070         }
1071         preempt_disable();
1072
1073         if (query_current_values_with_pending_wait(data))
1074                 goto out;
1075
1076         khz = find_khz_freq_from_fid(data->currfid);
1077
1078  out:
1079         preempt_enable_no_resched();
1080         set_cpus_allowed(current, oldmask);
1081
1082         return khz;
1083 }
1084
1085 static struct freq_attr* powernow_k8_attr[] = {
1086         &cpufreq_freq_attr_scaling_available_freqs,
1087         NULL,
1088 };
1089
1090 static struct cpufreq_driver cpufreq_amd64_driver = {
1091         .verify = powernowk8_verify,
1092         .target = powernowk8_target,
1093         .init = powernowk8_cpu_init,
1094         .exit = __devexit_p(powernowk8_cpu_exit),
1095         .get = powernowk8_get,
1096         .name = "powernow-k8",
1097         .owner = THIS_MODULE,
1098         .attr = powernow_k8_attr,
1099 };
1100
1101 /* driver entry point for init */
1102 static int __init powernowk8_init(void)
1103 {
1104         unsigned int i, supported_cpus = 0;
1105
1106         for (i=0; i<NR_CPUS; i++) {
1107                 if (!cpu_online(i))
1108                         continue;
1109                 if (check_supported_cpu(i))
1110                         supported_cpus++;
1111         }
1112
1113         if (supported_cpus == num_online_cpus()) {
1114                 printk(KERN_INFO PFX "Found %d AMD Athlon 64 / Opteron processors (" VERSION ")\n",
1115                         supported_cpus);
1116                 return cpufreq_register_driver(&cpufreq_amd64_driver);
1117         }
1118
1119         return -ENODEV;
1120 }
1121
1122 /* driver entry point for term */
1123 static void __exit powernowk8_exit(void)
1124 {
1125         dprintk("exit\n");
1126
1127         cpufreq_unregister_driver(&cpufreq_amd64_driver);
1128 }
1129
1130 MODULE_AUTHOR("Paul Devriendt <paul.devriendt@amd.com>");
1131 MODULE_DESCRIPTION("AMD Athlon 64 and Opteron processor frequency driver.");
1132 MODULE_LICENSE("GPL");
1133
1134 late_initcall(powernowk8_init);
1135 module_exit(powernowk8_exit);