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