arch/i386/kernel/cpu/cpufreq/powernow-k8.c

   1 /*
   2  *   (c) 2003, 2004, 2005 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, 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 infrerred 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 1.60.2"
  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 #ifndef CONFIG_SMP
  58 static cpumask_t cpu_core_map[1];
  59 #endif
  60
  61 /* Return a frequency in MHz, given an input fid */
  62 static u32 find_freq_from_fid(u32 fid)
  63 {
  64         return 800 + (fid * 100);
  65 }
  66
  67 /* Return a frequency in KHz, given an input fid */
  68 static u32 find_khz_freq_from_fid(u32 fid)
  69 {
  70         return 1000 * find_freq_from_fid(fid);
  71 }
  72
  73 /* Return a voltage in miliVolts, given an input vid */
  74 static u32 find_millivolts_from_vid(struct powernow_k8_data *data, u32 vid)
  75 {
  76         return 1550-vid*25;
  77 }
  78
  79 /* Return the vco fid for an input fid
  80  *
  81  * Each "low" fid has corresponding "high" fid, and you can get to "low" fids
  82  * only from corresponding high fids. This returns "high" fid corresponding to
  83  * "low" one.
  84  */
  85 static u32 convert_fid_to_vco_fid(u32 fid)
  86 {
  87         if (fid < HI_FID_TABLE_BOTTOM)
  88                 return 8 + (2 * fid);
  89         else
  90                 return fid;
  91 }
  92
  93 /*
  94  * Return 1 if the pending bit is set. Unless we just instructed the processor
  95  * to transition to a new state, seeing this bit set is really bad news.
  96  */
  97 static int pending_bit_stuck(void)
  98 {
  99         u32 lo, hi;
 100
 101         rdmsr(MSR_FIDVID_STATUS, lo, hi);
 102         return lo & MSR_S_LO_CHANGE_PENDING ? 1 : 0;
 103 }
 104
 105 /*
 106  * Update the global current fid / vid values from the status msr.
 107  * Returns 1 on error.
 108  */
 109 static int query_current_values_with_pending_wait(struct powernow_k8_data *data)
 110 {
 111         u32 lo, hi;
 112         u32 i = 0;
 113
 114         do {
 115                 if (i++ > 10000) {
 116                         dprintk("detected change pending stuck\n");
 117                         return 1;
 118                 }
 119                 rdmsr(MSR_FIDVID_STATUS, lo, hi);
 120         } while (lo & MSR_S_LO_CHANGE_PENDING);
 121
 122         data->currvid = hi & MSR_S_HI_CURRENT_VID;
 123         data->currfid = lo & MSR_S_LO_CURRENT_FID;
 124
 125         return 0;
 126 }
 127
 128 /* the isochronous relief time */
 129 static void count_off_irt(struct powernow_k8_data *data)
 130 {
 131         udelay((1 << data->irt) * 10);
 132         return;
 133 }
 134
 135 /* the voltage stabalization time */
 136 static void count_off_vst(struct powernow_k8_data *data)
 137 {
 138         udelay(data->vstable * VST_UNITS_20US);
 139         return;
 140 }
 141
 142 /* need to init the control msr to a safe value (for each cpu) */
 143 static void fidvid_msr_init(void)
 144 {
 145         u32 lo, hi;
 146         u8 fid, vid;
 147
 148         rdmsr(MSR_FIDVID_STATUS, lo, hi);
 149         vid = hi & MSR_S_HI_CURRENT_VID;
 150         fid = lo & MSR_S_LO_CURRENT_FID;
 151         lo = fid | (vid << MSR_C_LO_VID_SHIFT);
 152         hi = MSR_C_HI_STP_GNT_BENIGN;
 153         dprintk("cpu%d, init lo 0x%x, hi 0x%x\n", smp_processor_id(), lo, hi);
 154         wrmsr(MSR_FIDVID_CTL, lo, hi);
 155 }
 156
 157
 158 /* write the new fid value along with the other control fields to the msr */
 159 static int write_new_fid(struct powernow_k8_data *data, u32 fid)
 160 {
 161         u32 lo;
 162         u32 savevid = data->currvid;
 163         u32 i = 0;
 164
 165         if ((fid & INVALID_FID_MASK) || (data->currvid & INVALID_VID_MASK)) {
 166                 printk(KERN_ERR PFX "internal error - overflow on fid write\n");
 167                 return 1;
 168         }
 169
 170         lo = fid | (data->currvid << MSR_C_LO_VID_SHIFT) | MSR_C_LO_INIT_FID_VID;
 171
 172         dprintk("writing fid 0x%x, lo 0x%x, hi 0x%x\n",
 173                 fid, lo, data->plllock * PLL_LOCK_CONVERSION);
 174
 175         do {
 176                 wrmsr(MSR_FIDVID_CTL, lo, data->plllock * PLL_LOCK_CONVERSION);
 177                 if (i++ > 100) {
 178                         printk(KERN_ERR PFX "internal error - pending bit very stuck - no further pstate changes possible\n");
 179                         return 1;
 180                 }
 181         } while (query_current_values_with_pending_wait(data));
 182
 183         count_off_irt(data);
 184
 185         if (savevid != data->currvid) {
 186                 printk(KERN_ERR PFX "vid change on fid trans, old 0x%x, new 0x%x\n",
 187                        savevid, data->currvid);
 188                 return 1;
 189         }
 190
 191         if (fid != data->currfid) {
 192                 printk(KERN_ERR PFX "fid trans failed, fid 0x%x, curr 0x%x\n", fid,
 193                         data->currfid);
 194                 return 1;
 195         }
 196
 197         return 0;
 198 }
 199
 200 /* Write a new vid to the hardware */
 201 static int write_new_vid(struct powernow_k8_data *data, u32 vid)
 202 {
 203         u32 lo;
 204         u32 savefid = data->currfid;
 205         int i = 0;
 206
 207         if ((data->currfid & INVALID_FID_MASK) || (vid & INVALID_VID_MASK)) {
 208                 printk(KERN_ERR PFX "internal error - overflow on vid write\n");
 209                 return 1;
 210         }
 211
 212         lo = data->currfid | (vid << MSR_C_LO_VID_SHIFT) | MSR_C_LO_INIT_FID_VID;
 213
 214         dprintk("writing vid 0x%x, lo 0x%x, hi 0x%x\n",
 215                 vid, lo, STOP_GRANT_5NS);
 216
 217         do {
 218                 wrmsr(MSR_FIDVID_CTL, lo, STOP_GRANT_5NS);
 219                 if (i++ > 100) {
 220                         printk(KERN_ERR PFX "internal error - pending bit very stuck - no further pstate changes possible\n");
 221                         return 1;
 222                 }
 223         } while (query_current_values_with_pending_wait(data));
 224
 225         if (savefid != data->currfid) {
 226                 printk(KERN_ERR PFX "fid changed on vid trans, old 0x%x new 0x%x\n",
 227                        savefid, data->currfid);
 228                 return 1;
 229         }
 230
 231         if (vid != data->currvid) {
 232                 printk(KERN_ERR PFX "vid trans failed, vid 0x%x, curr 0x%x\n", vid,
 233                                 data->currvid);
 234                 return 1;
 235         }
 236
 237         return 0;
 238 }
 239
 240 /*
 241  * Reduce the vid by the max of step or reqvid.
 242  * Decreasing vid codes represent increasing voltages:
 243  * vid of 0 is 1.550V, vid of 0x1e is 0.800V, vid of VID_OFF is off.
 244  */
 245 static int decrease_vid_code_by_step(struct powernow_k8_data *data, u32 reqvid, u32 step)
 246 {
 247         if ((data->currvid - reqvid) > step)
 248                 reqvid = data->currvid - step;
 249
 250         if (write_new_vid(data, reqvid))
 251                 return 1;
 252
 253         count_off_vst(data);
 254
 255         return 0;
 256 }
 257
 258 /* Change the fid and vid, by the 3 phases. */
 259 static int transition_fid_vid(struct powernow_k8_data *data, u32 reqfid, u32 reqvid)
 260 {
 261         if (core_voltage_pre_transition(data, reqvid))
 262                 return 1;
 263
 264         if (core_frequency_transition(data, reqfid))
 265                 return 1;
 266
 267         if (core_voltage_post_transition(data, reqvid))
 268                 return 1;
 269
 270         if (query_current_values_with_pending_wait(data))
 271                 return 1;
 272
 273         if ((reqfid != data->currfid) || (reqvid != data->currvid)) {
 274                 printk(KERN_ERR PFX "failed (cpu%d): req 0x%x 0x%x, curr 0x%x 0x%x\n",
 275                                 smp_processor_id(),
 276                                 reqfid, reqvid, data->currfid, data->currvid);
 277                 return 1;
 278         }
 279
 280         dprintk("transitioned (cpu%d): new fid 0x%x, vid 0x%x\n",
 281                 smp_processor_id(), data->currfid, data->currvid);
 282
 283         return 0;
 284 }
 285
 286 /* Phase 1 - core voltage transition ... setup voltage */
 287 static int core_voltage_pre_transition(struct powernow_k8_data *data, u32 reqvid)
 288 {
 289         u32 rvosteps = data->rvo;
 290         u32 savefid = data->currfid;
 291         u32 maxvid, lo;
 292
 293         dprintk("ph1 (cpu%d): start, currfid 0x%x, currvid 0x%x, reqvid 0x%x, rvo 0x%x\n",
 294                 smp_processor_id(),
 295                 data->currfid, data->currvid, reqvid, data->rvo);
 296
 297         rdmsr(MSR_FIDVID_STATUS, lo, maxvid);
 298         maxvid = 0x1f & (maxvid >> 16);
 299         dprintk("ph1 maxvid=0x%x\n", maxvid);
 300         if (reqvid < maxvid) /* lower numbers are higher voltages */
 301                 reqvid = maxvid;
 302
 303         while (data->currvid > reqvid) {
 304                 dprintk("ph1: curr 0x%x, req vid 0x%x\n",
 305                         data->currvid, reqvid);
 306                 if (decrease_vid_code_by_step(data, reqvid, data->vidmvs))
 307                         return 1;
 308         }
 309
 310         while ((rvosteps > 0) && ((data->rvo + data->currvid) > reqvid)) {
 311                 if (data->currvid == maxvid) {
 312                         rvosteps = 0;
 313                 } else {
 314                         dprintk("ph1: changing vid for rvo, req 0x%x\n",
 315                                 data->currvid - 1);
 316                         if (decrease_vid_code_by_step(data, data->currvid - 1, 1))
 317                                 return 1;
 318                         rvosteps--;
 319                 }
 320         }
 321
 322         if (query_current_values_with_pending_wait(data))
 323                 return 1;
 324
 325         if (savefid != data->currfid) {
 326                 printk(KERN_ERR PFX "ph1 err, currfid changed 0x%x\n", data->currfid);
 327                 return 1;
 328         }
 329
 330         dprintk("ph1 complete, currfid 0x%x, currvid 0x%x\n",
 331                 data->currfid, data->currvid);
 332
 333         return 0;
 334 }
 335
 336 /* Phase 2 - core frequency transition */
 337 static int core_frequency_transition(struct powernow_k8_data *data, u32 reqfid)
 338 {
 339         u32 vcoreqfid, vcocurrfid, vcofiddiff, fid_interval, savevid = data->currvid;
 340
 341         if ((reqfid < HI_FID_TABLE_BOTTOM) && (data->currfid < HI_FID_TABLE_BOTTOM)) {
 342                 printk(KERN_ERR PFX "ph2: illegal lo-lo transition 0x%x 0x%x\n",
 343                         reqfid, data->currfid);
 344                 return 1;
 345         }
 346
 347         if (data->currfid == reqfid) {
 348                 printk(KERN_ERR PFX "ph2 null fid transition 0x%x\n", data->currfid);
 349                 return 0;
 350         }
 351
 352         dprintk("ph2 (cpu%d): starting, currfid 0x%x, currvid 0x%x, reqfid 0x%x\n",
 353                 smp_processor_id(),
 354                 data->currfid, data->currvid, reqfid);
 355
 356         vcoreqfid = convert_fid_to_vco_fid(reqfid);
 357         vcocurrfid = convert_fid_to_vco_fid(data->currfid);
 358         vcofiddiff = vcocurrfid > vcoreqfid ? vcocurrfid - vcoreqfid
 359             : vcoreqfid - vcocurrfid;
 360
 361         while (vcofiddiff > 2) {
 362                 (data->currfid & 1) ? (fid_interval = 1) : (fid_interval = 2);
 363
 364                 if (reqfid > data->currfid) {
 365                         if (data->currfid > LO_FID_TABLE_TOP) {
 366                                 if (write_new_fid(data, data->currfid + fid_interval)) {
 367                                         return 1;
 368                                 }
 369                         } else {
 370                                 if (write_new_fid
 371                                     (data, 2 + convert_fid_to_vco_fid(data->currfid))) {
 372                                         return 1;
 373                                 }
 374                         }
 375                 } else {
 376                         if (write_new_fid(data, data->currfid - fid_interval))
 377                                 return 1;
 378                 }
 379
 380                 vcocurrfid = convert_fid_to_vco_fid(data->currfid);
 381                 vcofiddiff = vcocurrfid > vcoreqfid ? vcocurrfid - vcoreqfid
 382                     : vcoreqfid - vcocurrfid;
 383         }
 384
 385         if (write_new_fid(data, reqfid))
 386                 return 1;
 387
 388         if (query_current_values_with_pending_wait(data))
 389                 return 1;
 390
 391         if (data->currfid != reqfid) {
 392                 printk(KERN_ERR PFX
 393                         "ph2: mismatch, failed fid transition, curr 0x%x, req 0x%x\n",
 394                         data->currfid, reqfid);
 395                 return 1;
 396         }
 397
 398         if (savevid != data->currvid) {
 399                 printk(KERN_ERR PFX "ph2: vid changed, save 0x%x, curr 0x%x\n",
 400                         savevid, data->currvid);
 401                 return 1;
 402         }
 403
 404         dprintk("ph2 complete, currfid 0x%x, currvid 0x%x\n",
 405                 data->currfid, data->currvid);
 406
 407         return 0;
 408 }
 409
 410 /* Phase 3 - core voltage transition flow ... jump to the final vid. */
 411 static int core_voltage_post_transition(struct powernow_k8_data *data, u32 reqvid)
 412 {
 413         u32 savefid = data->currfid;
 414         u32 savereqvid = reqvid;
 415
 416         dprintk("ph3 (cpu%d): starting, currfid 0x%x, currvid 0x%x\n",
 417                 smp_processor_id(),
 418                 data->currfid, data->currvid);
 419
 420         if (reqvid != data->currvid) {
 421                 if (write_new_vid(data, reqvid))
 422                         return 1;
 423
 424                 if (savefid != data->currfid) {
 425                         printk(KERN_ERR PFX
 426                                "ph3: bad fid change, save 0x%x, curr 0x%x\n",
 427                                savefid, data->currfid);
 428                         return 1;
 429                 }
 430
 431                 if (data->currvid != reqvid) {
 432                         printk(KERN_ERR PFX
 433                                "ph3: failed vid transition\n, req 0x%x, curr 0x%x",
 434                                reqvid, data->currvid);
 435                         return 1;
 436                 }
 437         }
 438
 439         if (query_current_values_with_pending_wait(data))
 440                 return 1;
 441
 442         if (savereqvid != data->currvid) {
 443                 dprintk("ph3 failed, currvid 0x%x\n", data->currvid);
 444                 return 1;
 445         }
 446
 447         if (savefid != data->currfid) {
 448                 dprintk("ph3 failed, currfid changed 0x%x\n",
 449                         data->currfid);
 450                 return 1;
 451         }
 452
 453         dprintk("ph3 complete, currfid 0x%x, currvid 0x%x\n",
 454                 data->currfid, data->currvid);
 455
 456         return 0;
 457 }
 458
 459 static int check_supported_cpu(unsigned int cpu)
 460 {
 461         cpumask_t oldmask = CPU_MASK_ALL;
 462         u32 eax, ebx, ecx, edx;
 463         unsigned int rc = 0;
 464
 465         oldmask = current->cpus_allowed;
 466         set_cpus_allowed(current, cpumask_of_cpu(cpu));
 467
 468         if (smp_processor_id() != cpu) {
 469                 printk(KERN_ERR PFX "limiting to cpu %u failed\n", cpu);
 470                 goto out;
 471         }
 472
 473         if (current_cpu_data.x86_vendor != X86_VENDOR_AMD)
 474                 goto out;
 475
 476         eax = cpuid_eax(CPUID_PROCESSOR_SIGNATURE);
 477         if ((eax & CPUID_XFAM) != CPUID_XFAM_K8)
 478                 goto out;
 479
 480         if (((eax & CPUID_USE_XFAM_XMOD) != CPUID_USE_XFAM_XMOD) ||
 481             ((eax & CPUID_XMOD) > CPUID_XMOD_REV_G)) {
 482                 printk(KERN_INFO PFX "Processor cpuid %x not supported\n", eax);
 483                 goto out;
 484         }
 485
 486         eax = cpuid_eax(CPUID_GET_MAX_CAPABILITIES);
 487         if (eax < CPUID_FREQ_VOLT_CAPABILITIES) {
 488                 printk(KERN_INFO PFX
 489                        "No frequency change capabilities detected\n");
 490                 goto out;
 491         }
 492
 493         cpuid(CPUID_FREQ_VOLT_CAPABILITIES, &eax, &ebx, &ecx, &edx);
 494         if ((edx & P_STATE_TRANSITION_CAPABLE) != P_STATE_TRANSITION_CAPABLE) {
 495                 printk(KERN_INFO PFX "Power state transitions not supported\n");
 496                 goto out;
 497         }
 498
 499         rc = 1;
 500
 501 out:
 502         set_cpus_allowed(current, oldmask);
 503         return rc;
 504 }
 505
 506 static int check_pst_table(struct powernow_k8_data *data, struct pst_s *pst, u8 maxvid)
 507 {
 508         unsigned int j;
 509         u8 lastfid = 0xff;
 510
 511         for (j = 0; j < data->numps; j++) {
 512                 if (pst[j].vid > LEAST_VID) {
 513                         printk(KERN_ERR PFX "vid %d invalid : 0x%x\n", j, pst[j].vid);
 514                         return -EINVAL;
 515                 }
 516                 if (pst[j].vid < data->rvo) {   /* vid + rvo >= 0 */
 517                         printk(KERN_ERR BFX "0 vid exceeded with pstate %d\n", j);
 518                         return -ENODEV;
 519                 }
 520                 if (pst[j].vid < maxvid + data->rvo) {  /* vid + rvo >= maxvid */
 521                         printk(KERN_ERR BFX "maxvid exceeded with pstate %d\n", j);
 522                         return -ENODEV;
 523                 }
 524                 if (pst[j].fid > MAX_FID) {
 525                         printk(KERN_ERR BFX "maxfid exceeded with pstate %d\n", j);
 526                         return -ENODEV;
 527                 }
 528                 if (j && (pst[j].fid < HI_FID_TABLE_BOTTOM)) {
 529                         /* Only first fid is allowed to be in "low" range */
 530                         printk(KERN_ERR BFX "two low fids - %d : 0x%x\n", j, pst[j].fid);
 531                         return -EINVAL;
 532                 }
 533                 if (pst[j].fid < lastfid)
 534                         lastfid = pst[j].fid;
 535         }
 536         if (lastfid & 1) {
 537                 printk(KERN_ERR BFX "lastfid invalid\n");
 538                 return -EINVAL;
 539         }
 540         if (lastfid > LO_FID_TABLE_TOP)
 541                 printk(KERN_INFO BFX  "first fid not from lo freq table\n");
 542
 543         return 0;
 544 }
 545
 546 static void print_basics(struct powernow_k8_data *data)
 547 {
 548         int j;
 549         for (j = 0; j < data->numps; j++) {
 550                 if (data->powernow_table[j].frequency != CPUFREQ_ENTRY_INVALID)
 551                         printk(KERN_INFO PFX "   %d : fid 0x%x (%d MHz), vid 0x%x (%d mV)\n", j,
 552                                 data->powernow_table[j].index & 0xff,
 553                                 data->powernow_table[j].frequency/1000,
 554                                 data->powernow_table[j].index >> 8,
 555                                 find_millivolts_from_vid(data, data->powernow_table[j].index >> 8));
 556         }
 557         if (data->batps)
 558                 printk(KERN_INFO PFX "Only %d pstates on battery\n", data->batps);
 559 }
 560
 561 static int fill_powernow_table(struct powernow_k8_data *data, struct pst_s *pst, u8 maxvid)
 562 {
 563         struct cpufreq_frequency_table *powernow_table;
 564         unsigned int j;
 565
 566         if (data->batps) {    /* use ACPI support to get full speed on mains power */
 567                 printk(KERN_WARNING PFX "Only %d pstates usable (use ACPI driver for full range\n", data->batps);
 568                 data->numps = data->batps;
 569         }
 570
 571         for ( j=1; j<data->numps; j++ ) {
 572                 if (pst[j-1].fid >= pst[j].fid) {
 573                         printk(KERN_ERR PFX "PST out of sequence\n");
 574                         return -EINVAL;
 575                 }
 576         }
 577
 578         if (data->numps < 2) {
 579                 printk(KERN_ERR PFX "no p states to transition\n");
 580                 return -ENODEV;
 581         }
 582
 583         if (check_pst_table(data, pst, maxvid))
 584                 return -EINVAL;
 585
 586         powernow_table = kmalloc((sizeof(struct cpufreq_frequency_table)
 587                 * (data->numps + 1)), GFP_KERNEL);
 588         if (!powernow_table) {
 589                 printk(KERN_ERR PFX "powernow_table memory alloc failure\n");
 590                 return -ENOMEM;
 591         }
 592
 593         for (j = 0; j < data->numps; j++) {
 594                 powernow_table[j].index = pst[j].fid; /* lower 8 bits */
 595                 powernow_table[j].index |= (pst[j].vid << 8); /* upper 8 bits */
 596                 powernow_table[j].frequency = find_khz_freq_from_fid(pst[j].fid);
 597         }
 598         powernow_table[data->numps].frequency = CPUFREQ_TABLE_END;
 599         powernow_table[data->numps].index = 0;
 600
 601         if (query_current_values_with_pending_wait(data)) {
 602                 kfree(powernow_table);
 603                 return -EIO;
 604         }
 605
 606         dprintk("cfid 0x%x, cvid 0x%x\n", data->currfid, data->currvid);
 607         data->powernow_table = powernow_table;
 608         print_basics(data);
 609
 610         for (j = 0; j < data->numps; j++)
 611                 if ((pst[j].fid==data->currfid) && (pst[j].vid==data->currvid))
 612                         return 0;
 613
 614         dprintk("currfid/vid do not match PST, ignoring\n");
 615         return 0;
 616 }
 617
 618 /* Find and validate the PSB/PST table in BIOS. */
 619 static int find_psb_table(struct powernow_k8_data *data)
 620 {
 621         struct psb_s *psb;
 622         unsigned int i;
 623         u32 mvs;
 624         u8 maxvid;
 625         u32 cpst = 0;
 626         u32 thiscpuid;
 627
 628         for (i = 0xc0000; i < 0xffff0; i += 0x10) {
 629                 /* Scan BIOS looking for the signature. */
 630                 /* It can not be at ffff0 - it is too big. */
 631
 632                 psb = phys_to_virt(i);
 633                 if (memcmp(psb, PSB_ID_STRING, PSB_ID_STRING_LEN) != 0)
 634                         continue;
 635
 636                 dprintk("found PSB header at 0x%p\n", psb);
 637
 638                 dprintk("table vers: 0x%x\n", psb->tableversion);
 639                 if (psb->tableversion != PSB_VERSION_1_4) {
 640                         printk(KERN_ERR BFX "PSB table is not v1.4\n");
 641                         return -ENODEV;
 642                 }
 643
 644                 dprintk("flags: 0x%x\n", psb->flags1);
 645                 if (psb->flags1) {
 646                         printk(KERN_ERR BFX "unknown flags\n");
 647                         return -ENODEV;
 648                 }
 649
 650                 data->vstable = psb->vstable;
 651                 dprintk("voltage stabilization time: %d(*20us)\n", data->vstable);
 652
 653                 dprintk("flags2: 0x%x\n", psb->flags2);
 654                 data->rvo = psb->flags2 & 3;
 655                 data->irt = ((psb->flags2) >> 2) & 3;
 656                 mvs = ((psb->flags2) >> 4) & 3;
 657                 data->vidmvs = 1 << mvs;
 658                 data->batps = ((psb->flags2) >> 6) & 3;
 659
 660                 dprintk("ramp voltage offset: %d\n", data->rvo);
 661                 dprintk("isochronous relief time: %d\n", data->irt);
 662                 dprintk("maximum voltage step: %d - 0x%x\n", mvs, data->vidmvs);
 663
 664                 dprintk("numpst: 0x%x\n", psb->num_tables);
 665                 cpst = psb->num_tables;
 666                 if ((psb->cpuid == 0x00000fc0) || (psb->cpuid == 0x00000fe0) ){
 667                         thiscpuid = cpuid_eax(CPUID_PROCESSOR_SIGNATURE);
 668                         if ((thiscpuid == 0x00000fc0) || (thiscpuid == 0x00000fe0) ) {
 669                                 cpst = 1;
 670                         }
 671                 }
 672                 if (cpst != 1) {
 673                         printk(KERN_ERR BFX "numpst must be 1\n");
 674                         return -ENODEV;
 675                 }
 676
 677                 data->plllock = psb->plllocktime;
 678                 dprintk("plllocktime: 0x%x (units 1us)\n", psb->plllocktime);
 679                 dprintk("maxfid: 0x%x\n", psb->maxfid);
 680                 dprintk("maxvid: 0x%x\n", psb->maxvid);
 681                 maxvid = psb->maxvid;
 682
 683                 data->numps = psb->numps;
 684                 dprintk("numpstates: 0x%x\n", data->numps);
 685                 return fill_powernow_table(data, (struct pst_s *)(psb+1), maxvid);
 686         }
 687         /*
 688          * If you see this message, complain to BIOS manufacturer. If
 689          * he tells you "we do not support Linux" or some similar
 690          * nonsense, remember that Windows 2000 uses the same legacy
 691          * mechanism that the old Linux PSB driver uses. Tell them it
 692          * is broken with Windows 2000.
 693          *
 694          * The reference to the AMD documentation is chapter 9 in the
 695          * BIOS and Kernel Developer's Guide, which is available on
 696          * www.amd.com
 697          */
 698         printk(KERN_ERR PFX "BIOS error - no PSB or ACPI _PSS objects\n");
 699         return -ENODEV;
 700 }
 701
 702 #ifdef CONFIG_X86_POWERNOW_K8_ACPI
 703 static void powernow_k8_acpi_pst_values(struct powernow_k8_data *data, unsigned int index)
 704 {
 705         if (!data->acpi_data.state_count)
 706                 return;
 707
 708         data->irt = (data->acpi_data.states[index].control >> IRT_SHIFT) & IRT_MASK;
 709         data->rvo = (data->acpi_data.states[index].control >> RVO_SHIFT) & RVO_MASK;
 710         data->exttype = (data->acpi_data.states[index].control >> EXT_TYPE_SHIFT) & EXT_TYPE_MASK;
 711         data->plllock = (data->acpi_data.states[index].control >> PLL_L_SHIFT) & PLL_L_MASK;
 712         data->vidmvs = 1 << ((data->acpi_data.states[index].control >> MVS_SHIFT) & MVS_MASK);
 713         data->vstable = (data->acpi_data.states[index].control >> VST_SHIFT) & VST_MASK;
 714 }
 715
 716 static int powernow_k8_cpu_init_acpi(struct powernow_k8_data *data)
 717 {
 718         int i;
 719         int cntlofreq = 0;
 720         struct cpufreq_frequency_table *powernow_table;
 721
 722         if (acpi_processor_register_performance(&data->acpi_data, data->cpu)) {
 723                 dprintk("register performance failed: bad ACPI data\n");
 724                 return -EIO;
 725         }
 726
 727         /* verify the data contained in the ACPI structures */
 728         if (data->acpi_data.state_count <= 1) {
 729                 dprintk("No ACPI P-States\n");
 730                 goto err_out;
 731         }
 732
 733         if ((data->acpi_data.control_register.space_id != ACPI_ADR_SPACE_FIXED_HARDWARE) ||
 734                 (data->acpi_data.status_register.space_id != ACPI_ADR_SPACE_FIXED_HARDWARE)) {
 735                 dprintk("Invalid control/status registers (%x - %x)\n",
 736                         data->acpi_data.control_register.space_id,
 737                         data->acpi_data.status_register.space_id);
 738                 goto err_out;
 739         }
 740
 741         /* fill in data->powernow_table */
 742         powernow_table = kmalloc((sizeof(struct cpufreq_frequency_table)
 743                 * (data->acpi_data.state_count + 1)), GFP_KERNEL);
 744         if (!powernow_table) {
 745                 dprintk("powernow_table memory alloc failure\n");
 746                 goto err_out;
 747         }
 748
 749         for (i = 0; i < data->acpi_data.state_count; i++) {
 750                 u32 fid;
 751                 u32 vid;
 752
 753                 if (data->exttype) {
 754                         fid = data->acpi_data.states[i].status & FID_MASK;
 755                         vid = (data->acpi_data.states[i].status >> VID_SHIFT) & VID_MASK;
 756                 } else {
 757                         fid = data->acpi_data.states[i].control & FID_MASK;
 758                         vid = (data->acpi_data.states[i].control >> VID_SHIFT) & VID_MASK;
 759                 }
 760
 761                 dprintk("   %d : fid 0x%x, vid 0x%x\n", i, fid, vid);
 762
 763                 powernow_table[i].index = fid; /* lower 8 bits */
 764                 powernow_table[i].index |= (vid << 8); /* upper 8 bits */
 765                 powernow_table[i].frequency = find_khz_freq_from_fid(fid);
 766
 767                 /* verify frequency is OK */
 768                 if ((powernow_table[i].frequency > (MAX_FREQ * 1000)) ||
 769                         (powernow_table[i].frequency < (MIN_FREQ * 1000))) {
 770                         dprintk("invalid freq %u kHz, ignoring\n", powernow_table[i].frequency);
 771                         powernow_table[i].frequency = CPUFREQ_ENTRY_INVALID;
 772                         continue;
 773                 }
 774
 775                 /* verify voltage is OK - BIOSs are using "off" to indicate invalid */
 776                 if (vid == VID_OFF) {
 777                         dprintk("invalid vid %u, ignoring\n", vid);
 778                         powernow_table[i].frequency = CPUFREQ_ENTRY_INVALID;
 779                         continue;
 780                 }
 781
 782                 /* verify only 1 entry from the lo frequency table */
 783                 if (fid < HI_FID_TABLE_BOTTOM) {
 784                         if (cntlofreq) {
 785                                 /* if both entries are the same, ignore this one ... */
 786                                 if ((powernow_table[i].frequency != powernow_table[cntlofreq].frequency) ||
 787                                     (powernow_table[i].index != powernow_table[cntlofreq].index)) {
 788                                         printk(KERN_ERR PFX "Too many lo freq table entries\n");
 789                                         goto err_out_mem;
 790                                 }
 791
 792                                 dprintk("double low frequency table entry, ignoring it.\n");
 793                                 powernow_table[i].frequency = CPUFREQ_ENTRY_INVALID;
 794                                 continue;
 795                         } else
 796                                 cntlofreq = i;
 797                 }
 798
 799                 if (powernow_table[i].frequency != (data->acpi_data.states[i].core_frequency * 1000)) {
 800                         printk(KERN_INFO PFX "invalid freq entries %u kHz vs. %u kHz\n",
 801                                 powernow_table[i].frequency,
 802                                 (unsigned int) (data->acpi_data.states[i].core_frequency * 1000));
 803                         powernow_table[i].frequency = CPUFREQ_ENTRY_INVALID;
 804                         continue;
 805                 }
 806         }
 807
 808         powernow_table[data->acpi_data.state_count].frequency = CPUFREQ_TABLE_END;
 809         powernow_table[data->acpi_data.state_count].index = 0;
 810         data->powernow_table = powernow_table;
 811
 812         /* fill in data */
 813         data->numps = data->acpi_data.state_count;
 814         print_basics(data);
 815         powernow_k8_acpi_pst_values(data, 0);
 816
 817         /* notify BIOS that we exist */
 818         acpi_processor_notify_smm(THIS_MODULE);
 819
 820         return 0;
 821
 822 err_out_mem:
 823         kfree(powernow_table);
 824
 825 err_out:
 826         acpi_processor_unregister_performance(&data->acpi_data, data->cpu);
 827
 828         /* data->acpi_data.state_count informs us at ->exit() whether ACPI was used */
 829         data->acpi_data.state_count = 0;
 830
 831         return -ENODEV;
 832 }
 833
 834 static void powernow_k8_cpu_exit_acpi(struct powernow_k8_data *data)
 835 {
 836         if (data->acpi_data.state_count)
 837                 acpi_processor_unregister_performance(&data->acpi_data, data->cpu);
 838 }
 839
 840 #else
 841 static int powernow_k8_cpu_init_acpi(struct powernow_k8_data *data) { return -ENODEV; }
 842 static void powernow_k8_cpu_exit_acpi(struct powernow_k8_data *data) { return; }
 843 static void powernow_k8_acpi_pst_values(struct powernow_k8_data *data, unsigned int index) { return; }
 844 #endif /* CONFIG_X86_POWERNOW_K8_ACPI */
 845
 846 /* Take a frequency, and issue the fid/vid transition command */
 847 static int transition_frequency(struct powernow_k8_data *data, unsigned int index)
 848 {
 849         u32 fid;
 850         u32 vid;
 851         int res, i;
 852         struct cpufreq_freqs freqs;
 853
 854         dprintk("cpu %d transition to index %u\n", smp_processor_id(), index);
 855
 856         /* fid are the lower 8 bits of the index we stored into
 857          * the cpufreq frequency table in find_psb_table, vid are
 858          * the upper 8 bits.
 859          */
 860
 861         fid = data->powernow_table[index].index & 0xFF;
 862         vid = (data->powernow_table[index].index & 0xFF00) >> 8;
 863
 864         dprintk("table matched fid 0x%x, giving vid 0x%x\n", fid, vid);
 865
 866         if (query_current_values_with_pending_wait(data))
 867                 return 1;
 868
 869         if ((data->currvid == vid) && (data->currfid == fid)) {
 870                 dprintk("target matches current values (fid 0x%x, vid 0x%x)\n",
 871                         fid, vid);
 872                 return 0;
 873         }
 874
 875         if ((fid < HI_FID_TABLE_BOTTOM) && (data->currfid < HI_FID_TABLE_BOTTOM)) {
 876                 printk(KERN_ERR PFX
 877                        "ignoring illegal change in lo freq table-%x to 0x%x\n",
 878                        data->currfid, fid);
 879                 return 1;
 880         }
 881
 882         dprintk("cpu %d, changing to fid 0x%x, vid 0x%x\n",
 883                 smp_processor_id(), fid, vid);
 884
 885         freqs.cpu = data->cpu;
 886         freqs.old = find_khz_freq_from_fid(data->currfid);
 887         freqs.new = find_khz_freq_from_fid(fid);
 888         for_each_cpu_mask(i, cpu_core_map[data->cpu]) {
 889                 freqs.cpu = i;
 890                 cpufreq_notify_transition(&freqs, CPUFREQ_PRECHANGE);
 891         }
 892
 893         res = transition_fid_vid(data, fid, vid);
 894
 895         freqs.new = find_khz_freq_from_fid(data->currfid);
 896         for_each_cpu_mask(i, cpu_core_map[data->cpu]) {
 897                 freqs.cpu = i;
 898                 cpufreq_notify_transition(&freqs, CPUFREQ_POSTCHANGE);
 899         }
 900         return res;
 901 }
 902
 903 /* Driver entry point to switch to the target frequency */
 904 static int powernowk8_target(struct cpufreq_policy *pol, unsigned targfreq, unsigned relation)
 905 {
 906         cpumask_t oldmask = CPU_MASK_ALL;
 907         struct powernow_k8_data *data = powernow_data[pol->cpu];
 908         u32 checkfid;
 909         u32 checkvid;
 910         unsigned int newstate;
 911         int ret = -EIO;
 912
 913         if (!data)
 914                 return -EINVAL;
 915
 916         checkfid = data->currfid;
 917         checkvid = data->currvid;
 918
 919         /* only run on specific CPU from here on */
 920         oldmask = current->cpus_allowed;
 921         set_cpus_allowed(current, cpumask_of_cpu(pol->cpu));
 922
 923         if (smp_processor_id() != pol->cpu) {
 924                 printk(KERN_ERR PFX "limiting to cpu %u failed\n", pol->cpu);
 925                 goto err_out;
 926         }
 927
 928         if (pending_bit_stuck()) {
 929                 printk(KERN_ERR PFX "failing targ, change pending bit set\n");
 930                 goto err_out;
 931         }
 932
 933         dprintk("targ: cpu %d, %d kHz, min %d, max %d, relation %d\n",
 934                 pol->cpu, targfreq, pol->min, pol->max, relation);
 935
 936         if (query_current_values_with_pending_wait(data)) {
 937                 ret = -EIO;
 938                 goto err_out;
 939         }
 940
 941         dprintk("targ: curr fid 0x%x, vid 0x%x\n",
 942                 data->currfid, data->currvid);
 943
 944         if ((checkvid != data->currvid) || (checkfid != data->currfid)) {
 945                 printk(KERN_INFO PFX
 946                         "error - out of sync, fix 0x%x 0x%x, vid 0x%x 0x%x\n",
 947                         checkfid, data->currfid, checkvid, data->currvid);
 948         }
 949
 950         if (cpufreq_frequency_table_target(pol, data->powernow_table, targfreq, relation, &newstate))
 951                 goto err_out;
 952
 953         mutex_lock(&fidvid_mutex);
 954
 955         powernow_k8_acpi_pst_values(data, newstate);
 956
 957         if (transition_frequency(data, newstate)) {
 958                 printk(KERN_ERR PFX "transition frequency failed\n");
 959                 ret = 1;
 960                 mutex_unlock(&fidvid_mutex);
 961                 goto err_out;
 962         }
 963         mutex_unlock(&fidvid_mutex);
 964
 965         pol->cur = find_khz_freq_from_fid(data->currfid);
 966         ret = 0;
 967
 968 err_out:
 969         set_cpus_allowed(current, oldmask);
 970         return ret;
 971 }
 972
 973 /* Driver entry point to verify the policy and range of frequencies */
 974 static int powernowk8_verify(struct cpufreq_policy *pol)
 975 {
 976         struct powernow_k8_data *data = powernow_data[pol->cpu];
 977
 978         if (!data)
 979                 return -EINVAL;
 980
 981         return cpufreq_frequency_table_verify(pol, data->powernow_table);
 982 }
 983
 984 /* per CPU init entry point to the driver */
 985 static int __cpuinit powernowk8_cpu_init(struct cpufreq_policy *pol)
 986 {
 987         struct powernow_k8_data *data;
 988         cpumask_t oldmask = CPU_MASK_ALL;
 989         int rc;
 990
 991         if (!cpu_online(pol->cpu))
 992                 return -ENODEV;
 993
 994         if (!check_supported_cpu(pol->cpu))
 995                 return -ENODEV;
 996
 997         data = kzalloc(sizeof(struct powernow_k8_data), GFP_KERNEL);
 998         if (!data) {
 999                 printk(KERN_ERR PFX "unable to alloc powernow_k8_data");
1000                 return -ENOMEM;
1001         }
1002
1003         data->cpu = pol->cpu;
1004
1005         if (powernow_k8_cpu_init_acpi(data)) {
1006                 /*
1007                  * Use the PSB BIOS structure. This is only availabe on
1008                  * an UP version, and is deprecated by AMD.
1009                  */
1010
1011                 if ((num_online_cpus() != 1) || (num_possible_cpus() != 1)) {
1012                         printk(KERN_ERR PFX "MP systems not supported by PSB BIOS structure\n");
1013                         kfree(data);
1014                         return -ENODEV;
1015                 }
1016                 if (pol->cpu != 0) {
1017                         printk(KERN_ERR PFX "init not cpu 0\n");
1018                         kfree(data);
1019                         return -ENODEV;
1020                 }
1021                 rc = find_psb_table(data);
1022                 if (rc) {
1023                         kfree(data);
1024                         return -ENODEV;
1025                 }
1026         }
1027
1028         /* only run on specific CPU from here on */
1029         oldmask = current->cpus_allowed;
1030         set_cpus_allowed(current, cpumask_of_cpu(pol->cpu));
1031
1032         if (smp_processor_id() != pol->cpu) {
1033                 printk(KERN_ERR PFX "limiting to cpu %u failed\n", pol->cpu);
1034                 goto err_out;
1035         }
1036
1037         if (pending_bit_stuck()) {
1038                 printk(KERN_ERR PFX "failing init, change pending bit set\n");
1039                 goto err_out;
1040         }
1041
1042         if (query_current_values_with_pending_wait(data))
1043                 goto err_out;
1044
1045         fidvid_msr_init();
1046
1047         /* run on any CPU again */
1048         set_cpus_allowed(current, oldmask);
1049
1050         pol->governor = CPUFREQ_DEFAULT_GOVERNOR;
1051         pol->cpus = cpu_core_map[pol->cpu];
1052
1053         /* Take a crude guess here.
1054          * That guess was in microseconds, so multiply with 1000 */
1055         pol->cpuinfo.transition_latency = (((data->rvo + 8) * data->vstable * VST_UNITS_20US)
1056             + (3 * (1 << data->irt) * 10)) * 1000;
1057
1058         pol->cur = find_khz_freq_from_fid(data->currfid);
1059         dprintk("policy current frequency %d kHz\n", pol->cur);
1060
1061         /* min/max the cpu is capable of */
1062         if (cpufreq_frequency_table_cpuinfo(pol, data->powernow_table)) {
1063                 printk(KERN_ERR PFX "invalid powernow_table\n");
1064                 powernow_k8_cpu_exit_acpi(data);
1065                 kfree(data->powernow_table);
1066                 kfree(data);
1067                 return -EINVAL;
1068         }
1069
1070         cpufreq_frequency_table_get_attr(data->powernow_table, pol->cpu);
1071
1072         printk("cpu_init done, current fid 0x%x, vid 0x%x\n",
1073                data->currfid, data->currvid);
1074
1075         powernow_data[pol->cpu] = data;
1076
1077         return 0;
1078
1079 err_out:
1080         set_cpus_allowed(current, oldmask);
1081         powernow_k8_cpu_exit_acpi(data);
1082
1083         kfree(data);
1084         return -ENODEV;
1085 }
1086
1087 static int __devexit powernowk8_cpu_exit (struct cpufreq_policy *pol)
1088 {
1089         struct powernow_k8_data *data = powernow_data[pol->cpu];
1090
1091         if (!data)
1092                 return -EINVAL;
1093
1094         powernow_k8_cpu_exit_acpi(data);
1095
1096         cpufreq_frequency_table_put_attr(pol->cpu);
1097
1098         kfree(data->powernow_table);
1099         kfree(data);
1100
1101         return 0;
1102 }
1103
1104 static unsigned int powernowk8_get (unsigned int cpu)
1105 {
1106         struct powernow_k8_data *data;
1107         cpumask_t oldmask = current->cpus_allowed;
1108         unsigned int khz = 0;
1109
1110         data = powernow_data[first_cpu(cpu_core_map[cpu])];
1111
1112         if (!data)
1113                 return -EINVAL;
1114
1115         set_cpus_allowed(current, cpumask_of_cpu(cpu));
1116         if (smp_processor_id() != cpu) {
1117                 printk(KERN_ERR PFX "limiting to CPU %d failed in powernowk8_get\n", cpu);
1118                 set_cpus_allowed(current, oldmask);
1119                 return 0;
1120         }
1121
1122         if (query_current_values_with_pending_wait(data))
1123                 goto out;
1124
1125         khz = find_khz_freq_from_fid(data->currfid);
1126
1127 out:
1128         set_cpus_allowed(current, oldmask);
1129         return khz;
1130 }
1131
1132 static struct freq_attr* powernow_k8_attr[] = {
1133         &cpufreq_freq_attr_scaling_available_freqs,
1134         NULL,
1135 };
1136
1137 static struct cpufreq_driver cpufreq_amd64_driver = {
1138         .verify = powernowk8_verify,
1139         .target = powernowk8_target,
1140         .init = powernowk8_cpu_init,
1141         .exit = __devexit_p(powernowk8_cpu_exit),
1142         .get = powernowk8_get,
1143         .name = "powernow-k8",
1144         .owner = THIS_MODULE,
1145         .attr = powernow_k8_attr,
1146 };
1147
1148 /* driver entry point for init */
1149 static int __cpuinit powernowk8_init(void)
1150 {
1151         unsigned int i, supported_cpus = 0;
1152
1153         for_each_online_cpu(i) {
1154                 if (check_supported_cpu(i))
1155                         supported_cpus++;
1156         }
1157
1158         if (supported_cpus == num_online_cpus()) {
1159                 printk(KERN_INFO PFX "Found %d AMD Athlon 64 / Opteron "
1160                         "processors (" VERSION ")\n", supported_cpus);
1161                 return cpufreq_register_driver(&cpufreq_amd64_driver);
1162         }
1163
1164         return -ENODEV;
1165 }
1166
1167 /* driver entry point for term */
1168 static void __exit powernowk8_exit(void)
1169 {
1170         dprintk("exit\n");
1171
1172         cpufreq_unregister_driver(&cpufreq_amd64_driver);
1173 }
1174
1175 MODULE_AUTHOR("Paul Devriendt <paul.devriendt@amd.com> and Mark Langsdorf <mark.langsdorf@amd.com>");
1176 MODULE_DESCRIPTION("AMD Athlon 64 and Opteron processor frequency driver.");
1177 MODULE_LICENSE("GPL");
1178
1179 late_initcall(powernowk8_init);
1180 module_exit(powernowk8_exit);