Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame^] | 1 | /* |
| 2 | * AMD K7 Powernow driver. |
| 3 | * (C) 2003 Dave Jones <davej@codemonkey.org.uk> on behalf of SuSE Labs. |
| 4 | * (C) 2003-2004 Dave Jones <davej@redhat.com> |
| 5 | * |
| 6 | * Licensed under the terms of the GNU GPL License version 2. |
| 7 | * Based upon datasheets & sample CPUs kindly provided by AMD. |
| 8 | * |
| 9 | * Errata 5: Processor may fail to execute a FID/VID change in presence of interrupt. |
| 10 | * - We cli/sti on stepping A0 CPUs around the FID/VID transition. |
| 11 | * Errata 15: Processors with half frequency multipliers may hang upon wakeup from disconnect. |
| 12 | * - We disable half multipliers if ACPI is used on A0 stepping CPUs. |
| 13 | */ |
| 14 | |
| 15 | #include <linux/config.h> |
| 16 | #include <linux/kernel.h> |
| 17 | #include <linux/module.h> |
| 18 | #include <linux/moduleparam.h> |
| 19 | #include <linux/init.h> |
| 20 | #include <linux/cpufreq.h> |
| 21 | #include <linux/slab.h> |
| 22 | #include <linux/string.h> |
| 23 | #include <linux/dmi.h> |
| 24 | |
| 25 | #include <asm/msr.h> |
| 26 | #include <asm/timex.h> |
| 27 | #include <asm/io.h> |
| 28 | #include <asm/system.h> |
| 29 | |
| 30 | #ifdef CONFIG_X86_POWERNOW_K7_ACPI |
| 31 | #include <linux/acpi.h> |
| 32 | #include <acpi/processor.h> |
| 33 | #endif |
| 34 | |
| 35 | #include "powernow-k7.h" |
| 36 | |
| 37 | #define PFX "powernow: " |
| 38 | |
| 39 | |
| 40 | struct psb_s { |
| 41 | u8 signature[10]; |
| 42 | u8 tableversion; |
| 43 | u8 flags; |
| 44 | u16 settlingtime; |
| 45 | u8 reserved1; |
| 46 | u8 numpst; |
| 47 | }; |
| 48 | |
| 49 | struct pst_s { |
| 50 | u32 cpuid; |
| 51 | u8 fsbspeed; |
| 52 | u8 maxfid; |
| 53 | u8 startvid; |
| 54 | u8 numpstates; |
| 55 | }; |
| 56 | |
| 57 | #ifdef CONFIG_X86_POWERNOW_K7_ACPI |
| 58 | union powernow_acpi_control_t { |
| 59 | struct { |
| 60 | unsigned long fid:5, |
| 61 | vid:5, |
| 62 | sgtc:20, |
| 63 | res1:2; |
| 64 | } bits; |
| 65 | unsigned long val; |
| 66 | }; |
| 67 | #endif |
| 68 | |
| 69 | #ifdef CONFIG_CPU_FREQ_DEBUG |
| 70 | /* divide by 1000 to get VCore voltage in V. */ |
| 71 | static int mobile_vid_table[32] = { |
| 72 | 2000, 1950, 1900, 1850, 1800, 1750, 1700, 1650, |
| 73 | 1600, 1550, 1500, 1450, 1400, 1350, 1300, 0, |
| 74 | 1275, 1250, 1225, 1200, 1175, 1150, 1125, 1100, |
| 75 | 1075, 1050, 1025, 1000, 975, 950, 925, 0, |
| 76 | }; |
| 77 | #endif |
| 78 | |
| 79 | /* divide by 10 to get FID. */ |
| 80 | static int fid_codes[32] = { |
| 81 | 110, 115, 120, 125, 50, 55, 60, 65, |
| 82 | 70, 75, 80, 85, 90, 95, 100, 105, |
| 83 | 30, 190, 40, 200, 130, 135, 140, 210, |
| 84 | 150, 225, 160, 165, 170, 180, -1, -1, |
| 85 | }; |
| 86 | |
| 87 | /* This parameter is used in order to force ACPI instead of legacy method for |
| 88 | * configuration purpose. |
| 89 | */ |
| 90 | |
| 91 | static int acpi_force; |
| 92 | |
| 93 | static struct cpufreq_frequency_table *powernow_table; |
| 94 | |
| 95 | static unsigned int can_scale_bus; |
| 96 | static unsigned int can_scale_vid; |
| 97 | static unsigned int minimum_speed=-1; |
| 98 | static unsigned int maximum_speed; |
| 99 | static unsigned int number_scales; |
| 100 | static unsigned int fsb; |
| 101 | static unsigned int latency; |
| 102 | static char have_a0; |
| 103 | |
| 104 | #define dprintk(msg...) cpufreq_debug_printk(CPUFREQ_DEBUG_DRIVER, "powernow-k7", msg) |
| 105 | |
| 106 | static int check_fsb(unsigned int fsbspeed) |
| 107 | { |
| 108 | int delta; |
| 109 | unsigned int f = fsb / 1000; |
| 110 | |
| 111 | delta = (fsbspeed > f) ? fsbspeed - f : f - fsbspeed; |
| 112 | return (delta < 5); |
| 113 | } |
| 114 | |
| 115 | static int check_powernow(void) |
| 116 | { |
| 117 | struct cpuinfo_x86 *c = cpu_data; |
| 118 | unsigned int maxei, eax, ebx, ecx, edx; |
| 119 | |
| 120 | if ((c->x86_vendor != X86_VENDOR_AMD) || (c->x86 !=6)) { |
| 121 | #ifdef MODULE |
| 122 | printk (KERN_INFO PFX "This module only works with AMD K7 CPUs\n"); |
| 123 | #endif |
| 124 | return 0; |
| 125 | } |
| 126 | |
| 127 | /* Get maximum capabilities */ |
| 128 | maxei = cpuid_eax (0x80000000); |
| 129 | if (maxei < 0x80000007) { /* Any powernow info ? */ |
| 130 | #ifdef MODULE |
| 131 | printk (KERN_INFO PFX "No powernow capabilities detected\n"); |
| 132 | #endif |
| 133 | return 0; |
| 134 | } |
| 135 | |
| 136 | if ((c->x86_model == 6) && (c->x86_mask == 0)) { |
| 137 | printk (KERN_INFO PFX "K7 660[A0] core detected, enabling errata workarounds\n"); |
| 138 | have_a0 = 1; |
| 139 | } |
| 140 | |
| 141 | cpuid(0x80000007, &eax, &ebx, &ecx, &edx); |
| 142 | |
| 143 | /* Check we can actually do something before we say anything.*/ |
| 144 | if (!(edx & (1 << 1 | 1 << 2))) |
| 145 | return 0; |
| 146 | |
| 147 | printk (KERN_INFO PFX "PowerNOW! Technology present. Can scale: "); |
| 148 | |
| 149 | if (edx & 1 << 1) { |
| 150 | printk ("frequency"); |
| 151 | can_scale_bus=1; |
| 152 | } |
| 153 | |
| 154 | if ((edx & (1 << 1 | 1 << 2)) == 0x6) |
| 155 | printk (" and "); |
| 156 | |
| 157 | if (edx & 1 << 2) { |
| 158 | printk ("voltage"); |
| 159 | can_scale_vid=1; |
| 160 | } |
| 161 | |
| 162 | printk (".\n"); |
| 163 | return 1; |
| 164 | } |
| 165 | |
| 166 | |
| 167 | static int get_ranges (unsigned char *pst) |
| 168 | { |
| 169 | unsigned int j; |
| 170 | unsigned int speed; |
| 171 | u8 fid, vid; |
| 172 | |
| 173 | powernow_table = kmalloc((sizeof(struct cpufreq_frequency_table) * (number_scales + 1)), GFP_KERNEL); |
| 174 | if (!powernow_table) |
| 175 | return -ENOMEM; |
| 176 | memset(powernow_table, 0, (sizeof(struct cpufreq_frequency_table) * (number_scales + 1))); |
| 177 | |
| 178 | for (j=0 ; j < number_scales; j++) { |
| 179 | fid = *pst++; |
| 180 | |
| 181 | powernow_table[j].frequency = (fsb * fid_codes[fid]) / 10; |
| 182 | powernow_table[j].index = fid; /* lower 8 bits */ |
| 183 | |
| 184 | speed = powernow_table[j].frequency; |
| 185 | |
| 186 | if ((fid_codes[fid] % 10)==5) { |
| 187 | #ifdef CONFIG_X86_POWERNOW_K7_ACPI |
| 188 | if (have_a0 == 1) |
| 189 | powernow_table[j].frequency = CPUFREQ_ENTRY_INVALID; |
| 190 | #endif |
| 191 | } |
| 192 | |
| 193 | if (speed < minimum_speed) |
| 194 | minimum_speed = speed; |
| 195 | if (speed > maximum_speed) |
| 196 | maximum_speed = speed; |
| 197 | |
| 198 | vid = *pst++; |
| 199 | powernow_table[j].index |= (vid << 8); /* upper 8 bits */ |
| 200 | |
| 201 | dprintk (" FID: 0x%x (%d.%dx [%dMHz]) " |
| 202 | "VID: 0x%x (%d.%03dV)\n", fid, fid_codes[fid] / 10, |
| 203 | fid_codes[fid] % 10, speed/1000, vid, |
| 204 | mobile_vid_table[vid]/1000, |
| 205 | mobile_vid_table[vid]%1000); |
| 206 | } |
| 207 | powernow_table[number_scales].frequency = CPUFREQ_TABLE_END; |
| 208 | powernow_table[number_scales].index = 0; |
| 209 | |
| 210 | return 0; |
| 211 | } |
| 212 | |
| 213 | |
| 214 | static void change_FID(int fid) |
| 215 | { |
| 216 | union msr_fidvidctl fidvidctl; |
| 217 | |
| 218 | rdmsrl (MSR_K7_FID_VID_CTL, fidvidctl.val); |
| 219 | if (fidvidctl.bits.FID != fid) { |
| 220 | fidvidctl.bits.SGTC = latency; |
| 221 | fidvidctl.bits.FID = fid; |
| 222 | fidvidctl.bits.VIDC = 0; |
| 223 | fidvidctl.bits.FIDC = 1; |
| 224 | wrmsrl (MSR_K7_FID_VID_CTL, fidvidctl.val); |
| 225 | } |
| 226 | } |
| 227 | |
| 228 | |
| 229 | static void change_VID(int vid) |
| 230 | { |
| 231 | union msr_fidvidctl fidvidctl; |
| 232 | |
| 233 | rdmsrl (MSR_K7_FID_VID_CTL, fidvidctl.val); |
| 234 | if (fidvidctl.bits.VID != vid) { |
| 235 | fidvidctl.bits.SGTC = latency; |
| 236 | fidvidctl.bits.VID = vid; |
| 237 | fidvidctl.bits.FIDC = 0; |
| 238 | fidvidctl.bits.VIDC = 1; |
| 239 | wrmsrl (MSR_K7_FID_VID_CTL, fidvidctl.val); |
| 240 | } |
| 241 | } |
| 242 | |
| 243 | |
| 244 | static void change_speed (unsigned int index) |
| 245 | { |
| 246 | u8 fid, vid; |
| 247 | struct cpufreq_freqs freqs; |
| 248 | union msr_fidvidstatus fidvidstatus; |
| 249 | int cfid; |
| 250 | |
| 251 | /* fid are the lower 8 bits of the index we stored into |
| 252 | * the cpufreq frequency table in powernow_decode_bios, |
| 253 | * vid are the upper 8 bits. |
| 254 | */ |
| 255 | |
| 256 | fid = powernow_table[index].index & 0xFF; |
| 257 | vid = (powernow_table[index].index & 0xFF00) >> 8; |
| 258 | |
| 259 | freqs.cpu = 0; |
| 260 | |
| 261 | rdmsrl (MSR_K7_FID_VID_STATUS, fidvidstatus.val); |
| 262 | cfid = fidvidstatus.bits.CFID; |
| 263 | freqs.old = fsb * fid_codes[cfid] / 10; |
| 264 | |
| 265 | freqs.new = powernow_table[index].frequency; |
| 266 | |
| 267 | cpufreq_notify_transition(&freqs, CPUFREQ_PRECHANGE); |
| 268 | |
| 269 | /* Now do the magic poking into the MSRs. */ |
| 270 | |
| 271 | if (have_a0 == 1) /* A0 errata 5 */ |
| 272 | local_irq_disable(); |
| 273 | |
| 274 | if (freqs.old > freqs.new) { |
| 275 | /* Going down, so change FID first */ |
| 276 | change_FID(fid); |
| 277 | change_VID(vid); |
| 278 | } else { |
| 279 | /* Going up, so change VID first */ |
| 280 | change_VID(vid); |
| 281 | change_FID(fid); |
| 282 | } |
| 283 | |
| 284 | |
| 285 | if (have_a0 == 1) |
| 286 | local_irq_enable(); |
| 287 | |
| 288 | cpufreq_notify_transition(&freqs, CPUFREQ_POSTCHANGE); |
| 289 | } |
| 290 | |
| 291 | |
| 292 | #ifdef CONFIG_X86_POWERNOW_K7_ACPI |
| 293 | |
| 294 | static struct acpi_processor_performance *acpi_processor_perf; |
| 295 | |
| 296 | static int powernow_acpi_init(void) |
| 297 | { |
| 298 | int i; |
| 299 | int retval = 0; |
| 300 | union powernow_acpi_control_t pc; |
| 301 | |
| 302 | if (acpi_processor_perf != NULL && powernow_table != NULL) { |
| 303 | retval = -EINVAL; |
| 304 | goto err0; |
| 305 | } |
| 306 | |
| 307 | acpi_processor_perf = kmalloc(sizeof(struct acpi_processor_performance), |
| 308 | GFP_KERNEL); |
| 309 | |
| 310 | if (!acpi_processor_perf) { |
| 311 | retval = -ENOMEM; |
| 312 | goto err0; |
| 313 | } |
| 314 | |
| 315 | memset(acpi_processor_perf, 0, sizeof(struct acpi_processor_performance)); |
| 316 | |
| 317 | if (acpi_processor_register_performance(acpi_processor_perf, 0)) { |
| 318 | retval = -EIO; |
| 319 | goto err1; |
| 320 | } |
| 321 | |
| 322 | if (acpi_processor_perf->control_register.space_id != ACPI_ADR_SPACE_FIXED_HARDWARE) { |
| 323 | retval = -ENODEV; |
| 324 | goto err2; |
| 325 | } |
| 326 | |
| 327 | if (acpi_processor_perf->status_register.space_id != ACPI_ADR_SPACE_FIXED_HARDWARE) { |
| 328 | retval = -ENODEV; |
| 329 | goto err2; |
| 330 | } |
| 331 | |
| 332 | number_scales = acpi_processor_perf->state_count; |
| 333 | |
| 334 | if (number_scales < 2) { |
| 335 | retval = -ENODEV; |
| 336 | goto err2; |
| 337 | } |
| 338 | |
| 339 | powernow_table = kmalloc((number_scales + 1) * (sizeof(struct cpufreq_frequency_table)), GFP_KERNEL); |
| 340 | if (!powernow_table) { |
| 341 | retval = -ENOMEM; |
| 342 | goto err2; |
| 343 | } |
| 344 | |
| 345 | memset(powernow_table, 0, ((number_scales + 1) * sizeof(struct cpufreq_frequency_table))); |
| 346 | |
| 347 | pc.val = (unsigned long) acpi_processor_perf->states[0].control; |
| 348 | for (i = 0; i < number_scales; i++) { |
| 349 | u8 fid, vid; |
| 350 | unsigned int speed; |
| 351 | |
| 352 | pc.val = (unsigned long) acpi_processor_perf->states[i].control; |
| 353 | dprintk ("acpi: P%d: %d MHz %d mW %d uS control %08x SGTC %d\n", |
| 354 | i, |
| 355 | (u32) acpi_processor_perf->states[i].core_frequency, |
| 356 | (u32) acpi_processor_perf->states[i].power, |
| 357 | (u32) acpi_processor_perf->states[i].transition_latency, |
| 358 | (u32) acpi_processor_perf->states[i].control, |
| 359 | pc.bits.sgtc); |
| 360 | |
| 361 | vid = pc.bits.vid; |
| 362 | fid = pc.bits.fid; |
| 363 | |
| 364 | powernow_table[i].frequency = fsb * fid_codes[fid] / 10; |
| 365 | powernow_table[i].index = fid; /* lower 8 bits */ |
| 366 | powernow_table[i].index |= (vid << 8); /* upper 8 bits */ |
| 367 | |
| 368 | speed = powernow_table[i].frequency; |
| 369 | |
| 370 | if ((fid_codes[fid] % 10)==5) { |
| 371 | if (have_a0 == 1) |
| 372 | powernow_table[i].frequency = CPUFREQ_ENTRY_INVALID; |
| 373 | } |
| 374 | |
| 375 | dprintk (" FID: 0x%x (%d.%dx [%dMHz]) " |
| 376 | "VID: 0x%x (%d.%03dV)\n", fid, fid_codes[fid] / 10, |
| 377 | fid_codes[fid] % 10, speed/1000, vid, |
| 378 | mobile_vid_table[vid]/1000, |
| 379 | mobile_vid_table[vid]%1000); |
| 380 | |
| 381 | if (latency < pc.bits.sgtc) |
| 382 | latency = pc.bits.sgtc; |
| 383 | |
| 384 | if (speed < minimum_speed) |
| 385 | minimum_speed = speed; |
| 386 | if (speed > maximum_speed) |
| 387 | maximum_speed = speed; |
| 388 | } |
| 389 | |
| 390 | powernow_table[i].frequency = CPUFREQ_TABLE_END; |
| 391 | powernow_table[i].index = 0; |
| 392 | |
| 393 | /* notify BIOS that we exist */ |
| 394 | acpi_processor_notify_smm(THIS_MODULE); |
| 395 | |
| 396 | return 0; |
| 397 | |
| 398 | err2: |
| 399 | acpi_processor_unregister_performance(acpi_processor_perf, 0); |
| 400 | err1: |
| 401 | kfree(acpi_processor_perf); |
| 402 | err0: |
| 403 | printk(KERN_WARNING PFX "ACPI perflib can not be used in this platform\n"); |
| 404 | acpi_processor_perf = NULL; |
| 405 | return retval; |
| 406 | } |
| 407 | #else |
| 408 | static int powernow_acpi_init(void) |
| 409 | { |
| 410 | printk(KERN_INFO PFX "no support for ACPI processor found." |
| 411 | " Please recompile your kernel with ACPI processor\n"); |
| 412 | return -EINVAL; |
| 413 | } |
| 414 | #endif |
| 415 | |
| 416 | static int powernow_decode_bios (int maxfid, int startvid) |
| 417 | { |
| 418 | struct psb_s *psb; |
| 419 | struct pst_s *pst; |
| 420 | unsigned int i, j; |
| 421 | unsigned char *p; |
| 422 | unsigned int etuple; |
| 423 | unsigned int ret; |
| 424 | |
| 425 | etuple = cpuid_eax(0x80000001); |
| 426 | |
| 427 | for (i=0xC0000; i < 0xffff0 ; i+=16) { |
| 428 | |
| 429 | p = phys_to_virt(i); |
| 430 | |
| 431 | if (memcmp(p, "AMDK7PNOW!", 10) == 0){ |
| 432 | dprintk ("Found PSB header at %p\n", p); |
| 433 | psb = (struct psb_s *) p; |
| 434 | dprintk ("Table version: 0x%x\n", psb->tableversion); |
| 435 | if (psb->tableversion != 0x12) { |
| 436 | printk (KERN_INFO PFX "Sorry, only v1.2 tables supported right now\n"); |
| 437 | return -ENODEV; |
| 438 | } |
| 439 | |
| 440 | dprintk ("Flags: 0x%x\n", psb->flags); |
| 441 | if ((psb->flags & 1)==0) { |
| 442 | dprintk ("Mobile voltage regulator\n"); |
| 443 | } else { |
| 444 | dprintk ("Desktop voltage regulator\n"); |
| 445 | } |
| 446 | |
| 447 | latency = psb->settlingtime; |
| 448 | if (latency < 100) { |
| 449 | printk (KERN_INFO PFX "BIOS set settling time to %d microseconds." |
| 450 | "Should be at least 100. Correcting.\n", latency); |
| 451 | latency = 100; |
| 452 | } |
| 453 | dprintk ("Settling Time: %d microseconds.\n", psb->settlingtime); |
| 454 | dprintk ("Has %d PST tables. (Only dumping ones relevant to this CPU).\n", psb->numpst); |
| 455 | |
| 456 | p += sizeof (struct psb_s); |
| 457 | |
| 458 | pst = (struct pst_s *) p; |
| 459 | |
| 460 | for (i = 0 ; i <psb->numpst; i++) { |
| 461 | pst = (struct pst_s *) p; |
| 462 | number_scales = pst->numpstates; |
| 463 | |
| 464 | if ((etuple == pst->cpuid) && check_fsb(pst->fsbspeed) && |
| 465 | (maxfid==pst->maxfid) && (startvid==pst->startvid)) |
| 466 | { |
| 467 | dprintk ("PST:%d (@%p)\n", i, pst); |
| 468 | dprintk (" cpuid: 0x%x fsb: %d maxFID: 0x%x startvid: 0x%x\n", |
| 469 | pst->cpuid, pst->fsbspeed, pst->maxfid, pst->startvid); |
| 470 | |
| 471 | ret = get_ranges ((char *) pst + sizeof (struct pst_s)); |
| 472 | return ret; |
| 473 | |
| 474 | } else { |
| 475 | p = (char *) pst + sizeof (struct pst_s); |
| 476 | for (j=0 ; j < number_scales; j++) |
| 477 | p+=2; |
| 478 | } |
| 479 | } |
| 480 | printk (KERN_INFO PFX "No PST tables match this cpuid (0x%x)\n", etuple); |
| 481 | printk (KERN_INFO PFX "This is indicative of a broken BIOS.\n"); |
| 482 | |
| 483 | return -EINVAL; |
| 484 | } |
| 485 | p++; |
| 486 | } |
| 487 | |
| 488 | return -ENODEV; |
| 489 | } |
| 490 | |
| 491 | |
| 492 | static int powernow_target (struct cpufreq_policy *policy, |
| 493 | unsigned int target_freq, |
| 494 | unsigned int relation) |
| 495 | { |
| 496 | unsigned int newstate; |
| 497 | |
| 498 | if (cpufreq_frequency_table_target(policy, powernow_table, target_freq, relation, &newstate)) |
| 499 | return -EINVAL; |
| 500 | |
| 501 | change_speed(newstate); |
| 502 | |
| 503 | return 0; |
| 504 | } |
| 505 | |
| 506 | |
| 507 | static int powernow_verify (struct cpufreq_policy *policy) |
| 508 | { |
| 509 | return cpufreq_frequency_table_verify(policy, powernow_table); |
| 510 | } |
| 511 | |
| 512 | /* |
| 513 | * We use the fact that the bus frequency is somehow |
| 514 | * a multiple of 100000/3 khz, then we compute sgtc according |
| 515 | * to this multiple. |
| 516 | * That way, we match more how AMD thinks all of that work. |
| 517 | * We will then get the same kind of behaviour already tested under |
| 518 | * the "well-known" other OS. |
| 519 | */ |
| 520 | static int __init fixup_sgtc(void) |
| 521 | { |
| 522 | unsigned int sgtc; |
| 523 | unsigned int m; |
| 524 | |
| 525 | m = fsb / 3333; |
| 526 | if ((m % 10) >= 5) |
| 527 | m += 5; |
| 528 | |
| 529 | m /= 10; |
| 530 | |
| 531 | sgtc = 100 * m * latency; |
| 532 | sgtc = sgtc / 3; |
| 533 | if (sgtc > 0xfffff) { |
| 534 | printk(KERN_WARNING PFX "SGTC too large %d\n", sgtc); |
| 535 | sgtc = 0xfffff; |
| 536 | } |
| 537 | return sgtc; |
| 538 | } |
| 539 | |
| 540 | static unsigned int powernow_get(unsigned int cpu) |
| 541 | { |
| 542 | union msr_fidvidstatus fidvidstatus; |
| 543 | unsigned int cfid; |
| 544 | |
| 545 | if (cpu) |
| 546 | return 0; |
| 547 | rdmsrl (MSR_K7_FID_VID_STATUS, fidvidstatus.val); |
| 548 | cfid = fidvidstatus.bits.CFID; |
| 549 | |
| 550 | return (fsb * fid_codes[cfid] / 10); |
| 551 | } |
| 552 | |
| 553 | |
| 554 | static int __init acer_cpufreq_pst(struct dmi_system_id *d) |
| 555 | { |
| 556 | printk(KERN_WARNING "%s laptop with broken PST tables in BIOS detected.\n", d->ident); |
| 557 | printk(KERN_WARNING "You need to downgrade to 3A21 (09/09/2002), or try a newer BIOS than 3A71 (01/20/2003)\n"); |
| 558 | printk(KERN_WARNING "cpufreq scaling has been disabled as a result of this.\n"); |
| 559 | return 0; |
| 560 | } |
| 561 | |
| 562 | /* |
| 563 | * Some Athlon laptops have really fucked PST tables. |
| 564 | * A BIOS update is all that can save them. |
| 565 | * Mention this, and disable cpufreq. |
| 566 | */ |
| 567 | static struct dmi_system_id __initdata powernow_dmi_table[] = { |
| 568 | { |
| 569 | .callback = acer_cpufreq_pst, |
| 570 | .ident = "Acer Aspire", |
| 571 | .matches = { |
| 572 | DMI_MATCH(DMI_SYS_VENDOR, "Insyde Software"), |
| 573 | DMI_MATCH(DMI_BIOS_VERSION, "3A71"), |
| 574 | }, |
| 575 | }, |
| 576 | { } |
| 577 | }; |
| 578 | |
| 579 | static int __init powernow_cpu_init (struct cpufreq_policy *policy) |
| 580 | { |
| 581 | union msr_fidvidstatus fidvidstatus; |
| 582 | int result; |
| 583 | |
| 584 | if (policy->cpu != 0) |
| 585 | return -ENODEV; |
| 586 | |
| 587 | rdmsrl (MSR_K7_FID_VID_STATUS, fidvidstatus.val); |
| 588 | |
| 589 | /* A K7 with powernow technology is set to max frequency by BIOS */ |
| 590 | fsb = (10 * cpu_khz) / fid_codes[fidvidstatus.bits.MFID]; |
| 591 | if (!fsb) { |
| 592 | printk(KERN_WARNING PFX "can not determine bus frequency\n"); |
| 593 | return -EINVAL; |
| 594 | } |
| 595 | dprintk("FSB: %3d.%03d MHz\n", fsb/1000, fsb%1000); |
| 596 | |
| 597 | if (dmi_check_system(powernow_dmi_table) || acpi_force) { |
| 598 | printk (KERN_INFO PFX "PSB/PST known to be broken. Trying ACPI instead\n"); |
| 599 | result = powernow_acpi_init(); |
| 600 | } else { |
| 601 | result = powernow_decode_bios(fidvidstatus.bits.MFID, fidvidstatus.bits.SVID); |
| 602 | if (result) { |
| 603 | printk (KERN_INFO PFX "Trying ACPI perflib\n"); |
| 604 | maximum_speed = 0; |
| 605 | minimum_speed = -1; |
| 606 | latency = 0; |
| 607 | result = powernow_acpi_init(); |
| 608 | if (result) { |
| 609 | printk (KERN_INFO PFX "ACPI and legacy methods failed\n"); |
| 610 | printk (KERN_INFO PFX "See http://www.codemonkey.org.uk/projects/cpufreq/powernow-k7.shtml\n"); |
| 611 | } |
| 612 | } else { |
| 613 | /* SGTC use the bus clock as timer */ |
| 614 | latency = fixup_sgtc(); |
| 615 | printk(KERN_INFO PFX "SGTC: %d\n", latency); |
| 616 | } |
| 617 | } |
| 618 | |
| 619 | if (result) |
| 620 | return result; |
| 621 | |
| 622 | printk (KERN_INFO PFX "Minimum speed %d MHz. Maximum speed %d MHz.\n", |
| 623 | minimum_speed/1000, maximum_speed/1000); |
| 624 | |
| 625 | policy->governor = CPUFREQ_DEFAULT_GOVERNOR; |
| 626 | |
| 627 | policy->cpuinfo.transition_latency = cpufreq_scale(2000000UL, fsb, latency); |
| 628 | |
| 629 | policy->cur = powernow_get(0); |
| 630 | |
| 631 | cpufreq_frequency_table_get_attr(powernow_table, policy->cpu); |
| 632 | |
| 633 | return cpufreq_frequency_table_cpuinfo(policy, powernow_table); |
| 634 | } |
| 635 | |
| 636 | static int powernow_cpu_exit (struct cpufreq_policy *policy) { |
| 637 | cpufreq_frequency_table_put_attr(policy->cpu); |
| 638 | |
| 639 | #ifdef CONFIG_X86_POWERNOW_K7_ACPI |
| 640 | if (acpi_processor_perf) { |
| 641 | acpi_processor_unregister_performance(acpi_processor_perf, 0); |
| 642 | kfree(acpi_processor_perf); |
| 643 | } |
| 644 | #endif |
| 645 | |
| 646 | if (powernow_table) |
| 647 | kfree(powernow_table); |
| 648 | |
| 649 | return 0; |
| 650 | } |
| 651 | |
| 652 | static struct freq_attr* powernow_table_attr[] = { |
| 653 | &cpufreq_freq_attr_scaling_available_freqs, |
| 654 | NULL, |
| 655 | }; |
| 656 | |
| 657 | static struct cpufreq_driver powernow_driver = { |
| 658 | .verify = powernow_verify, |
| 659 | .target = powernow_target, |
| 660 | .get = powernow_get, |
| 661 | .init = powernow_cpu_init, |
| 662 | .exit = powernow_cpu_exit, |
| 663 | .name = "powernow-k7", |
| 664 | .owner = THIS_MODULE, |
| 665 | .attr = powernow_table_attr, |
| 666 | }; |
| 667 | |
| 668 | static int __init powernow_init (void) |
| 669 | { |
| 670 | if (check_powernow()==0) |
| 671 | return -ENODEV; |
| 672 | return cpufreq_register_driver(&powernow_driver); |
| 673 | } |
| 674 | |
| 675 | |
| 676 | static void __exit powernow_exit (void) |
| 677 | { |
| 678 | cpufreq_unregister_driver(&powernow_driver); |
| 679 | } |
| 680 | |
| 681 | module_param(acpi_force, int, 0444); |
| 682 | MODULE_PARM_DESC(acpi_force, "Force ACPI to be used."); |
| 683 | |
| 684 | MODULE_AUTHOR ("Dave Jones <davej@codemonkey.org.uk>"); |
| 685 | MODULE_DESCRIPTION ("Powernow driver for AMD K7 processors."); |
| 686 | MODULE_LICENSE ("GPL"); |
| 687 | |
| 688 | late_initcall(powernow_init); |
| 689 | module_exit(powernow_exit); |
| 690 | |