Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * (C) 2001-2004 Dave Jones. <davej@codemonkey.org.uk> |
| 3 | * (C) 2002 Padraig Brady. <padraig@antefacto.com> |
| 4 | * |
| 5 | * Licensed under the terms of the GNU GPL License version 2. |
| 6 | * Based upon datasheets & sample CPUs kindly provided by VIA. |
| 7 | * |
| 8 | * VIA have currently 3 different versions of Longhaul. |
| 9 | * Version 1 (Longhaul) uses the BCR2 MSR at 0x1147. |
| 10 | * It is present only in Samuel 1 (C5A), Samuel 2 (C5B) stepping 0. |
| 11 | * Version 2 of longhaul is the same as v1, but adds voltage scaling. |
| 12 | * Present in Samuel 2 (steppings 1-7 only) (C5B), and Ezra (C5C) |
| 13 | * voltage scaling support has currently been disabled in this driver |
| 14 | * until we have code that gets it right. |
| 15 | * Version 3 of longhaul got renamed to Powersaver and redesigned |
| 16 | * to use the POWERSAVER MSR at 0x110a. |
| 17 | * It is present in Ezra-T (C5M), Nehemiah (C5X) and above. |
| 18 | * It's pretty much the same feature wise to longhaul v2, though |
| 19 | * there is provision for scaling FSB too, but this doesn't work |
| 20 | * too well in practice so we don't even try to use this. |
| 21 | * |
| 22 | * BIG FAT DISCLAIMER: Work in progress code. Possibly *dangerous* |
| 23 | */ |
| 24 | |
| 25 | #include <linux/kernel.h> |
| 26 | #include <linux/module.h> |
| 27 | #include <linux/moduleparam.h> |
| 28 | #include <linux/init.h> |
| 29 | #include <linux/cpufreq.h> |
| 30 | #include <linux/slab.h> |
| 31 | #include <linux/string.h> |
Dave Jones | 3be6a48 | 2005-05-31 19:03:51 -0700 | [diff] [blame^] | 32 | #include <linux/pci.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 33 | |
| 34 | #include <asm/msr.h> |
| 35 | #include <asm/timex.h> |
| 36 | #include <asm/io.h> |
| 37 | |
| 38 | #include "longhaul.h" |
| 39 | |
| 40 | #define PFX "longhaul: " |
| 41 | |
| 42 | #define TYPE_LONGHAUL_V1 1 |
| 43 | #define TYPE_LONGHAUL_V2 2 |
| 44 | #define TYPE_POWERSAVER 3 |
| 45 | |
| 46 | #define CPU_SAMUEL 1 |
| 47 | #define CPU_SAMUEL2 2 |
| 48 | #define CPU_EZRA 3 |
| 49 | #define CPU_EZRA_T 4 |
| 50 | #define CPU_NEHEMIAH 5 |
| 51 | |
| 52 | static int cpu_model; |
| 53 | static unsigned int numscales=16, numvscales; |
| 54 | static unsigned int fsb; |
| 55 | static int minvid, maxvid; |
| 56 | static unsigned int minmult, maxmult; |
| 57 | static int can_scale_voltage; |
| 58 | static int vrmrev; |
| 59 | |
| 60 | /* Module parameters */ |
| 61 | static int dont_scale_voltage; |
| 62 | |
| 63 | |
| 64 | #define dprintk(msg...) cpufreq_debug_printk(CPUFREQ_DEBUG_DRIVER, "longhaul", msg) |
| 65 | |
| 66 | |
| 67 | #define __hlt() __asm__ __volatile__("hlt": : :"memory") |
| 68 | |
| 69 | /* Clock ratios multiplied by 10 */ |
| 70 | static int clock_ratio[32]; |
| 71 | static int eblcr_table[32]; |
| 72 | static int voltage_table[32]; |
| 73 | static unsigned int highest_speed, lowest_speed; /* kHz */ |
| 74 | static int longhaul_version; |
| 75 | static struct cpufreq_frequency_table *longhaul_table; |
| 76 | |
| 77 | #ifdef CONFIG_CPU_FREQ_DEBUG |
| 78 | static char speedbuffer[8]; |
| 79 | |
| 80 | static char *print_speed(int speed) |
| 81 | { |
| 82 | if (speed > 1000) { |
| 83 | if (speed%1000 == 0) |
| 84 | sprintf (speedbuffer, "%dGHz", speed/1000); |
| 85 | else |
| 86 | sprintf (speedbuffer, "%d.%dGHz", speed/1000, (speed%1000)/100); |
| 87 | } else |
| 88 | sprintf (speedbuffer, "%dMHz", speed); |
| 89 | |
| 90 | return speedbuffer; |
| 91 | } |
| 92 | #endif |
| 93 | |
| 94 | |
| 95 | static unsigned int calc_speed(int mult) |
| 96 | { |
| 97 | int khz; |
| 98 | khz = (mult/10)*fsb; |
| 99 | if (mult%10) |
| 100 | khz += fsb/2; |
| 101 | khz *= 1000; |
| 102 | return khz; |
| 103 | } |
| 104 | |
| 105 | |
| 106 | static int longhaul_get_cpu_mult(void) |
| 107 | { |
| 108 | unsigned long invalue=0,lo, hi; |
| 109 | |
| 110 | rdmsr (MSR_IA32_EBL_CR_POWERON, lo, hi); |
| 111 | invalue = (lo & (1<<22|1<<23|1<<24|1<<25)) >>22; |
| 112 | if (longhaul_version==TYPE_LONGHAUL_V2 || longhaul_version==TYPE_POWERSAVER) { |
| 113 | if (lo & (1<<27)) |
| 114 | invalue+=16; |
| 115 | } |
| 116 | return eblcr_table[invalue]; |
| 117 | } |
| 118 | |
| 119 | |
| 120 | static void do_powersaver(union msr_longhaul *longhaul, |
| 121 | unsigned int clock_ratio_index) |
| 122 | { |
| 123 | int version; |
Dave Jones | 3be6a48 | 2005-05-31 19:03:51 -0700 | [diff] [blame^] | 124 | unsigned long flags; |
| 125 | struct pci_dev *dev; |
| 126 | int i; |
| 127 | u16 pci_cmd; |
| 128 | u16 cmd_state[64]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 129 | |
| 130 | switch (cpu_model) { |
| 131 | case CPU_EZRA_T: |
| 132 | version = 3; |
| 133 | break; |
| 134 | case CPU_NEHEMIAH: |
| 135 | version = 0xf; |
| 136 | break; |
| 137 | default: |
| 138 | return; |
| 139 | } |
| 140 | |
| 141 | rdmsrl(MSR_VIA_LONGHAUL, longhaul->val); |
| 142 | longhaul->bits.SoftBusRatio = clock_ratio_index & 0xf; |
| 143 | longhaul->bits.SoftBusRatio4 = (clock_ratio_index & 0x10) >> 4; |
| 144 | longhaul->bits.EnableSoftBusRatio = 1; |
| 145 | longhaul->bits.RevisionKey = 0; |
Dave Jones | 3be6a48 | 2005-05-31 19:03:51 -0700 | [diff] [blame^] | 146 | |
| 147 | preempt_disable(); |
| 148 | local_irq_save(flags); |
| 149 | |
| 150 | /* |
| 151 | * get current pci bus master state for all devices |
| 152 | * and clear bus master bit |
| 153 | */ |
| 154 | dev = NULL; |
| 155 | i = 0; |
| 156 | do { |
| 157 | dev = pci_get_device(PCI_ANY_ID, PCI_ANY_ID, dev); |
| 158 | if (dev != NULL) { |
| 159 | pci_read_config_word(dev, PCI_COMMAND, &pci_cmd); |
| 160 | cmd_state[i++] = pci_cmd; |
| 161 | pci_cmd &= ~PCI_COMMAND_MASTER; |
| 162 | pci_write_config_word(dev, PCI_COMMAND, pci_cmd); |
| 163 | } |
| 164 | } while (dev != NULL); |
| 165 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 166 | local_irq_enable(); |
Dave Jones | 3be6a48 | 2005-05-31 19:03:51 -0700 | [diff] [blame^] | 167 | |
| 168 | __hlt(); |
| 169 | wrmsrl(MSR_VIA_LONGHAUL, longhaul->val); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 170 | __hlt(); |
| 171 | |
Dave Jones | 3be6a48 | 2005-05-31 19:03:51 -0700 | [diff] [blame^] | 172 | local_irq_disable(); |
| 173 | |
| 174 | /* restore pci bus master state for all devices */ |
| 175 | dev = NULL; |
| 176 | i = 0; |
| 177 | do { |
| 178 | dev = pci_get_device(PCI_ANY_ID, PCI_ANY_ID, dev); |
| 179 | if (dev != NULL) { |
| 180 | pci_cmd = cmd_state[i++]; |
| 181 | pci_write_config_byte(dev, PCI_COMMAND, pci_cmd); |
| 182 | } |
| 183 | } while (dev != NULL); |
| 184 | local_irq_restore(flags); |
| 185 | preempt_enable(); |
| 186 | |
| 187 | /* disable bus ratio bit */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 188 | rdmsrl(MSR_VIA_LONGHAUL, longhaul->val); |
| 189 | longhaul->bits.EnableSoftBusRatio = 0; |
| 190 | longhaul->bits.RevisionKey = version; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 191 | wrmsrl(MSR_VIA_LONGHAUL, longhaul->val); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 192 | } |
| 193 | |
| 194 | /** |
| 195 | * longhaul_set_cpu_frequency() |
| 196 | * @clock_ratio_index : bitpattern of the new multiplier. |
| 197 | * |
| 198 | * Sets a new clock ratio. |
| 199 | */ |
| 200 | |
| 201 | static void longhaul_setstate(unsigned int clock_ratio_index) |
| 202 | { |
| 203 | int speed, mult; |
| 204 | struct cpufreq_freqs freqs; |
| 205 | union msr_longhaul longhaul; |
| 206 | union msr_bcr2 bcr2; |
| 207 | static unsigned int old_ratio=-1; |
| 208 | |
| 209 | if (old_ratio == clock_ratio_index) |
| 210 | return; |
| 211 | old_ratio = clock_ratio_index; |
| 212 | |
| 213 | mult = clock_ratio[clock_ratio_index]; |
| 214 | if (mult == -1) |
| 215 | return; |
| 216 | |
| 217 | speed = calc_speed(mult); |
| 218 | if ((speed > highest_speed) || (speed < lowest_speed)) |
| 219 | return; |
| 220 | |
| 221 | freqs.old = calc_speed(longhaul_get_cpu_mult()); |
| 222 | freqs.new = speed; |
| 223 | freqs.cpu = 0; /* longhaul.c is UP only driver */ |
| 224 | |
| 225 | cpufreq_notify_transition(&freqs, CPUFREQ_PRECHANGE); |
| 226 | |
| 227 | dprintk ("Setting to FSB:%dMHz Mult:%d.%dx (%s)\n", |
| 228 | fsb, mult/10, mult%10, print_speed(speed/1000)); |
| 229 | |
| 230 | switch (longhaul_version) { |
| 231 | |
| 232 | /* |
| 233 | * Longhaul v1. (Samuel[C5A] and Samuel2 stepping 0[C5B]) |
| 234 | * Software controlled multipliers only. |
| 235 | * |
| 236 | * *NB* Until we get voltage scaling working v1 & v2 are the same code. |
| 237 | * Longhaul v2 appears in Samuel2 Steppings 1->7 [C5b] and Ezra [C5C] |
| 238 | */ |
| 239 | case TYPE_LONGHAUL_V1: |
| 240 | case TYPE_LONGHAUL_V2: |
| 241 | rdmsrl (MSR_VIA_BCR2, bcr2.val); |
| 242 | /* Enable software clock multiplier */ |
| 243 | bcr2.bits.ESOFTBF = 1; |
| 244 | bcr2.bits.CLOCKMUL = clock_ratio_index; |
| 245 | local_irq_disable(); |
| 246 | wrmsrl (MSR_VIA_BCR2, bcr2.val); |
| 247 | local_irq_enable(); |
| 248 | |
| 249 | __hlt(); |
| 250 | |
| 251 | /* Disable software clock multiplier */ |
| 252 | rdmsrl (MSR_VIA_BCR2, bcr2.val); |
| 253 | bcr2.bits.ESOFTBF = 0; |
| 254 | local_irq_disable(); |
| 255 | wrmsrl (MSR_VIA_BCR2, bcr2.val); |
| 256 | local_irq_enable(); |
| 257 | break; |
| 258 | |
| 259 | /* |
| 260 | * Longhaul v3 (aka Powersaver). (Ezra-T [C5M] & Nehemiah [C5N]) |
| 261 | * We can scale voltage with this too, but that's currently |
| 262 | * disabled until we come up with a decent 'match freq to voltage' |
| 263 | * algorithm. |
| 264 | * When we add voltage scaling, we will also need to do the |
| 265 | * voltage/freq setting in order depending on the direction |
| 266 | * of scaling (like we do in powernow-k7.c) |
| 267 | * Nehemiah can do FSB scaling too, but this has never been proven |
| 268 | * to work in practice. |
| 269 | */ |
| 270 | case TYPE_POWERSAVER: |
| 271 | do_powersaver(&longhaul, clock_ratio_index); |
| 272 | break; |
| 273 | } |
| 274 | |
| 275 | cpufreq_notify_transition(&freqs, CPUFREQ_POSTCHANGE); |
| 276 | } |
| 277 | |
| 278 | /* |
| 279 | * Centaur decided to make life a little more tricky. |
| 280 | * Only longhaul v1 is allowed to read EBLCR BSEL[0:1]. |
| 281 | * Samuel2 and above have to try and guess what the FSB is. |
| 282 | * We do this by assuming we booted at maximum multiplier, and interpolate |
| 283 | * between that value multiplied by possible FSBs and cpu_mhz which |
| 284 | * was calculated at boot time. Really ugly, but no other way to do this. |
| 285 | */ |
| 286 | |
| 287 | #define ROUNDING 0xf |
| 288 | |
| 289 | static int _guess(int guess) |
| 290 | { |
| 291 | int target; |
| 292 | |
| 293 | target = ((maxmult/10)*guess); |
| 294 | if (maxmult%10 != 0) |
| 295 | target += (guess/2); |
| 296 | target += ROUNDING/2; |
| 297 | target &= ~ROUNDING; |
| 298 | return target; |
| 299 | } |
| 300 | |
| 301 | |
| 302 | static int guess_fsb(void) |
| 303 | { |
| 304 | int speed = (cpu_khz/1000); |
| 305 | int i; |
| 306 | int speeds[3] = { 66, 100, 133 }; |
| 307 | |
| 308 | speed += ROUNDING/2; |
| 309 | speed &= ~ROUNDING; |
| 310 | |
| 311 | for (i=0; i<3; i++) { |
| 312 | if (_guess(speeds[i]) == speed) |
| 313 | return speeds[i]; |
| 314 | } |
| 315 | return 0; |
| 316 | } |
| 317 | |
| 318 | |
| 319 | static int __init longhaul_get_ranges(void) |
| 320 | { |
| 321 | unsigned long invalue; |
| 322 | unsigned int multipliers[32]= { |
| 323 | 50,30,40,100,55,35,45,95,90,70,80,60,120,75,85,65, |
| 324 | -1,110,120,-1,135,115,125,105,130,150,160,140,-1,155,-1,145 }; |
| 325 | unsigned int j, k = 0; |
| 326 | union msr_longhaul longhaul; |
| 327 | unsigned long lo, hi; |
| 328 | unsigned int eblcr_fsb_table_v1[] = { 66, 133, 100, -1 }; |
| 329 | unsigned int eblcr_fsb_table_v2[] = { 133, 100, -1, 66 }; |
| 330 | |
| 331 | switch (longhaul_version) { |
| 332 | case TYPE_LONGHAUL_V1: |
| 333 | case TYPE_LONGHAUL_V2: |
| 334 | /* Ugh, Longhaul v1 didn't have the min/max MSRs. |
| 335 | Assume min=3.0x & max = whatever we booted at. */ |
| 336 | minmult = 30; |
| 337 | maxmult = longhaul_get_cpu_mult(); |
| 338 | rdmsr (MSR_IA32_EBL_CR_POWERON, lo, hi); |
| 339 | invalue = (lo & (1<<18|1<<19)) >>18; |
| 340 | if (cpu_model==CPU_SAMUEL || cpu_model==CPU_SAMUEL2) |
| 341 | fsb = eblcr_fsb_table_v1[invalue]; |
| 342 | else |
| 343 | fsb = guess_fsb(); |
| 344 | break; |
| 345 | |
| 346 | case TYPE_POWERSAVER: |
| 347 | /* Ezra-T */ |
| 348 | if (cpu_model==CPU_EZRA_T) { |
| 349 | rdmsrl (MSR_VIA_LONGHAUL, longhaul.val); |
| 350 | invalue = longhaul.bits.MaxMHzBR; |
| 351 | if (longhaul.bits.MaxMHzBR4) |
| 352 | invalue += 16; |
| 353 | maxmult=multipliers[invalue]; |
| 354 | |
| 355 | invalue = longhaul.bits.MinMHzBR; |
| 356 | if (longhaul.bits.MinMHzBR4 == 1) |
| 357 | minmult = 30; |
| 358 | else |
| 359 | minmult = multipliers[invalue]; |
| 360 | fsb = eblcr_fsb_table_v2[longhaul.bits.MaxMHzFSB]; |
| 361 | break; |
| 362 | } |
| 363 | |
| 364 | /* Nehemiah */ |
| 365 | if (cpu_model==CPU_NEHEMIAH) { |
| 366 | rdmsrl (MSR_VIA_LONGHAUL, longhaul.val); |
| 367 | |
| 368 | /* |
| 369 | * TODO: This code works, but raises a lot of questions. |
| 370 | * - Some Nehemiah's seem to have broken Min/MaxMHzBR's. |
| 371 | * We get around this by using a hardcoded multiplier of 4.0x |
| 372 | * for the minimimum speed, and the speed we booted up at for the max. |
| 373 | * This is done in longhaul_get_cpu_mult() by reading the EBLCR register. |
| 374 | * - According to some VIA documentation EBLCR is only |
| 375 | * in pre-Nehemiah C3s. How this still works is a mystery. |
| 376 | * We're possibly using something undocumented and unsupported, |
| 377 | * But it works, so we don't grumble. |
| 378 | */ |
| 379 | minmult=40; |
| 380 | maxmult=longhaul_get_cpu_mult(); |
| 381 | |
| 382 | /* Starting with the 1.2GHz parts, theres a 200MHz bus. */ |
| 383 | if ((cpu_khz/1000) > 1200) |
| 384 | fsb = 200; |
| 385 | else |
| 386 | fsb = eblcr_fsb_table_v2[longhaul.bits.MaxMHzFSB]; |
| 387 | break; |
| 388 | } |
| 389 | } |
| 390 | |
| 391 | dprintk ("MinMult:%d.%dx MaxMult:%d.%dx\n", |
| 392 | minmult/10, minmult%10, maxmult/10, maxmult%10); |
| 393 | |
| 394 | if (fsb == -1) { |
| 395 | printk (KERN_INFO PFX "Invalid (reserved) FSB!\n"); |
| 396 | return -EINVAL; |
| 397 | } |
| 398 | |
| 399 | highest_speed = calc_speed(maxmult); |
| 400 | lowest_speed = calc_speed(minmult); |
| 401 | dprintk ("FSB:%dMHz Lowest speed: %s Highest speed:%s\n", fsb, |
| 402 | print_speed(lowest_speed/1000), |
| 403 | print_speed(highest_speed/1000)); |
| 404 | |
| 405 | if (lowest_speed == highest_speed) { |
| 406 | printk (KERN_INFO PFX "highestspeed == lowest, aborting.\n"); |
| 407 | return -EINVAL; |
| 408 | } |
| 409 | if (lowest_speed > highest_speed) { |
| 410 | printk (KERN_INFO PFX "nonsense! lowest (%d > %d) !\n", |
| 411 | lowest_speed, highest_speed); |
| 412 | return -EINVAL; |
| 413 | } |
| 414 | |
| 415 | longhaul_table = kmalloc((numscales + 1) * sizeof(struct cpufreq_frequency_table), GFP_KERNEL); |
| 416 | if(!longhaul_table) |
| 417 | return -ENOMEM; |
| 418 | |
| 419 | for (j=0; j < numscales; j++) { |
| 420 | unsigned int ratio; |
| 421 | ratio = clock_ratio[j]; |
| 422 | if (ratio == -1) |
| 423 | continue; |
| 424 | if (ratio > maxmult || ratio < minmult) |
| 425 | continue; |
| 426 | longhaul_table[k].frequency = calc_speed(ratio); |
| 427 | longhaul_table[k].index = j; |
| 428 | k++; |
| 429 | } |
| 430 | |
| 431 | longhaul_table[k].frequency = CPUFREQ_TABLE_END; |
| 432 | if (!k) { |
| 433 | kfree (longhaul_table); |
| 434 | return -EINVAL; |
| 435 | } |
| 436 | |
| 437 | return 0; |
| 438 | } |
| 439 | |
| 440 | |
| 441 | static void __init longhaul_setup_voltagescaling(void) |
| 442 | { |
| 443 | union msr_longhaul longhaul; |
| 444 | |
| 445 | rdmsrl (MSR_VIA_LONGHAUL, longhaul.val); |
| 446 | |
| 447 | if (!(longhaul.bits.RevisionID & 1)) |
| 448 | return; |
| 449 | |
| 450 | minvid = longhaul.bits.MinimumVID; |
| 451 | maxvid = longhaul.bits.MaximumVID; |
| 452 | vrmrev = longhaul.bits.VRMRev; |
| 453 | |
| 454 | if (minvid == 0 || maxvid == 0) { |
| 455 | printk (KERN_INFO PFX "Bogus values Min:%d.%03d Max:%d.%03d. " |
| 456 | "Voltage scaling disabled.\n", |
| 457 | minvid/1000, minvid%1000, maxvid/1000, maxvid%1000); |
| 458 | return; |
| 459 | } |
| 460 | |
| 461 | if (minvid == maxvid) { |
| 462 | printk (KERN_INFO PFX "Claims to support voltage scaling but min & max are " |
| 463 | "both %d.%03d. Voltage scaling disabled\n", |
| 464 | maxvid/1000, maxvid%1000); |
| 465 | return; |
| 466 | } |
| 467 | |
| 468 | if (vrmrev==0) { |
| 469 | dprintk ("VRM 8.5 \n"); |
| 470 | memcpy (voltage_table, vrm85scales, sizeof(voltage_table)); |
| 471 | numvscales = (voltage_table[maxvid]-voltage_table[minvid])/25; |
| 472 | } else { |
| 473 | dprintk ("Mobile VRM \n"); |
| 474 | memcpy (voltage_table, mobilevrmscales, sizeof(voltage_table)); |
| 475 | numvscales = (voltage_table[maxvid]-voltage_table[minvid])/5; |
| 476 | } |
| 477 | |
| 478 | /* Current voltage isn't readable at first, so we need to |
| 479 | set it to a known value. The spec says to use maxvid */ |
| 480 | longhaul.bits.RevisionKey = longhaul.bits.RevisionID; /* FIXME: This is bad. */ |
| 481 | longhaul.bits.EnableSoftVID = 1; |
| 482 | longhaul.bits.SoftVID = maxvid; |
| 483 | wrmsrl (MSR_VIA_LONGHAUL, longhaul.val); |
| 484 | |
| 485 | minvid = voltage_table[minvid]; |
| 486 | maxvid = voltage_table[maxvid]; |
| 487 | |
| 488 | dprintk ("Min VID=%d.%03d Max VID=%d.%03d, %d possible voltage scales\n", |
| 489 | maxvid/1000, maxvid%1000, minvid/1000, minvid%1000, numvscales); |
| 490 | |
| 491 | can_scale_voltage = 1; |
| 492 | } |
| 493 | |
| 494 | |
| 495 | static int longhaul_verify(struct cpufreq_policy *policy) |
| 496 | { |
| 497 | return cpufreq_frequency_table_verify(policy, longhaul_table); |
| 498 | } |
| 499 | |
| 500 | |
| 501 | static int longhaul_target(struct cpufreq_policy *policy, |
| 502 | unsigned int target_freq, unsigned int relation) |
| 503 | { |
| 504 | unsigned int table_index = 0; |
| 505 | unsigned int new_clock_ratio = 0; |
| 506 | |
| 507 | if (cpufreq_frequency_table_target(policy, longhaul_table, target_freq, relation, &table_index)) |
| 508 | return -EINVAL; |
| 509 | |
| 510 | new_clock_ratio = longhaul_table[table_index].index & 0xFF; |
| 511 | |
| 512 | longhaul_setstate(new_clock_ratio); |
| 513 | |
| 514 | return 0; |
| 515 | } |
| 516 | |
| 517 | |
| 518 | static unsigned int longhaul_get(unsigned int cpu) |
| 519 | { |
| 520 | if (cpu) |
| 521 | return 0; |
| 522 | return calc_speed(longhaul_get_cpu_mult()); |
| 523 | } |
| 524 | |
| 525 | |
| 526 | static int __init longhaul_cpu_init(struct cpufreq_policy *policy) |
| 527 | { |
| 528 | struct cpuinfo_x86 *c = cpu_data; |
| 529 | char *cpuname=NULL; |
| 530 | int ret; |
| 531 | |
| 532 | switch (c->x86_model) { |
| 533 | case 6: |
| 534 | cpu_model = CPU_SAMUEL; |
| 535 | cpuname = "C3 'Samuel' [C5A]"; |
| 536 | longhaul_version = TYPE_LONGHAUL_V1; |
| 537 | memcpy (clock_ratio, samuel1_clock_ratio, sizeof(samuel1_clock_ratio)); |
| 538 | memcpy (eblcr_table, samuel1_eblcr, sizeof(samuel1_eblcr)); |
| 539 | break; |
| 540 | |
| 541 | case 7: |
| 542 | longhaul_version = TYPE_LONGHAUL_V1; |
| 543 | switch (c->x86_mask) { |
| 544 | case 0: |
| 545 | cpu_model = CPU_SAMUEL2; |
| 546 | cpuname = "C3 'Samuel 2' [C5B]"; |
| 547 | /* Note, this is not a typo, early Samuel2's had Samuel1 ratios. */ |
| 548 | memcpy (clock_ratio, samuel1_clock_ratio, sizeof(samuel1_clock_ratio)); |
| 549 | memcpy (eblcr_table, samuel2_eblcr, sizeof(samuel2_eblcr)); |
| 550 | break; |
| 551 | case 1 ... 15: |
| 552 | if (c->x86_mask < 8) { |
| 553 | cpu_model = CPU_SAMUEL2; |
| 554 | cpuname = "C3 'Samuel 2' [C5B]"; |
| 555 | } else { |
| 556 | cpu_model = CPU_EZRA; |
| 557 | cpuname = "C3 'Ezra' [C5C]"; |
| 558 | } |
| 559 | memcpy (clock_ratio, ezra_clock_ratio, sizeof(ezra_clock_ratio)); |
| 560 | memcpy (eblcr_table, ezra_eblcr, sizeof(ezra_eblcr)); |
| 561 | break; |
| 562 | } |
| 563 | break; |
| 564 | |
| 565 | case 8: |
| 566 | cpu_model = CPU_EZRA_T; |
| 567 | cpuname = "C3 'Ezra-T' [C5M]"; |
| 568 | longhaul_version = TYPE_POWERSAVER; |
| 569 | numscales=32; |
| 570 | memcpy (clock_ratio, ezrat_clock_ratio, sizeof(ezrat_clock_ratio)); |
| 571 | memcpy (eblcr_table, ezrat_eblcr, sizeof(ezrat_eblcr)); |
| 572 | break; |
| 573 | |
| 574 | case 9: |
| 575 | cpu_model = CPU_NEHEMIAH; |
| 576 | longhaul_version = TYPE_POWERSAVER; |
| 577 | numscales=32; |
| 578 | switch (c->x86_mask) { |
| 579 | case 0 ... 1: |
| 580 | cpuname = "C3 'Nehemiah A' [C5N]"; |
| 581 | memcpy (clock_ratio, nehemiah_a_clock_ratio, sizeof(nehemiah_a_clock_ratio)); |
| 582 | memcpy (eblcr_table, nehemiah_a_eblcr, sizeof(nehemiah_a_eblcr)); |
| 583 | break; |
| 584 | case 2 ... 4: |
| 585 | cpuname = "C3 'Nehemiah B' [C5N]"; |
| 586 | memcpy (clock_ratio, nehemiah_b_clock_ratio, sizeof(nehemiah_b_clock_ratio)); |
| 587 | memcpy (eblcr_table, nehemiah_b_eblcr, sizeof(nehemiah_b_eblcr)); |
| 588 | break; |
| 589 | case 5 ... 15: |
| 590 | cpuname = "C3 'Nehemiah C' [C5N]"; |
| 591 | memcpy (clock_ratio, nehemiah_c_clock_ratio, sizeof(nehemiah_c_clock_ratio)); |
| 592 | memcpy (eblcr_table, nehemiah_c_eblcr, sizeof(nehemiah_c_eblcr)); |
| 593 | break; |
| 594 | } |
| 595 | break; |
| 596 | |
| 597 | default: |
| 598 | cpuname = "Unknown"; |
| 599 | break; |
| 600 | } |
| 601 | |
| 602 | printk (KERN_INFO PFX "VIA %s CPU detected. ", cpuname); |
| 603 | switch (longhaul_version) { |
| 604 | case TYPE_LONGHAUL_V1: |
| 605 | case TYPE_LONGHAUL_V2: |
| 606 | printk ("Longhaul v%d supported.\n", longhaul_version); |
| 607 | break; |
| 608 | case TYPE_POWERSAVER: |
| 609 | printk ("Powersaver supported.\n"); |
| 610 | break; |
| 611 | }; |
| 612 | |
| 613 | ret = longhaul_get_ranges(); |
| 614 | if (ret != 0) |
| 615 | return ret; |
| 616 | |
| 617 | if ((longhaul_version==TYPE_LONGHAUL_V2 || longhaul_version==TYPE_POWERSAVER) && |
| 618 | (dont_scale_voltage==0)) |
| 619 | longhaul_setup_voltagescaling(); |
| 620 | |
| 621 | policy->governor = CPUFREQ_DEFAULT_GOVERNOR; |
| 622 | policy->cpuinfo.transition_latency = CPUFREQ_ETERNAL; |
| 623 | policy->cur = calc_speed(longhaul_get_cpu_mult()); |
| 624 | |
| 625 | ret = cpufreq_frequency_table_cpuinfo(policy, longhaul_table); |
| 626 | if (ret) |
| 627 | return ret; |
| 628 | |
| 629 | cpufreq_frequency_table_get_attr(longhaul_table, policy->cpu); |
| 630 | |
| 631 | return 0; |
| 632 | } |
| 633 | |
| 634 | static int __devexit longhaul_cpu_exit(struct cpufreq_policy *policy) |
| 635 | { |
| 636 | cpufreq_frequency_table_put_attr(policy->cpu); |
| 637 | return 0; |
| 638 | } |
| 639 | |
| 640 | static struct freq_attr* longhaul_attr[] = { |
| 641 | &cpufreq_freq_attr_scaling_available_freqs, |
| 642 | NULL, |
| 643 | }; |
| 644 | |
| 645 | static struct cpufreq_driver longhaul_driver = { |
| 646 | .verify = longhaul_verify, |
| 647 | .target = longhaul_target, |
| 648 | .get = longhaul_get, |
| 649 | .init = longhaul_cpu_init, |
| 650 | .exit = __devexit_p(longhaul_cpu_exit), |
| 651 | .name = "longhaul", |
| 652 | .owner = THIS_MODULE, |
| 653 | .attr = longhaul_attr, |
| 654 | }; |
| 655 | |
| 656 | |
| 657 | static int __init longhaul_init(void) |
| 658 | { |
| 659 | struct cpuinfo_x86 *c = cpu_data; |
| 660 | |
| 661 | if (c->x86_vendor != X86_VENDOR_CENTAUR || c->x86 != 6) |
| 662 | return -ENODEV; |
| 663 | |
| 664 | switch (c->x86_model) { |
| 665 | case 6 ... 9: |
| 666 | return cpufreq_register_driver(&longhaul_driver); |
| 667 | default: |
| 668 | printk (KERN_INFO PFX "Unknown VIA CPU. Contact davej@codemonkey.org.uk\n"); |
| 669 | } |
| 670 | |
| 671 | return -ENODEV; |
| 672 | } |
| 673 | |
| 674 | |
| 675 | static void __exit longhaul_exit(void) |
| 676 | { |
| 677 | int i=0; |
| 678 | |
| 679 | for (i=0; i < numscales; i++) { |
| 680 | if (clock_ratio[i] == maxmult) { |
| 681 | longhaul_setstate(i); |
| 682 | break; |
| 683 | } |
| 684 | } |
| 685 | |
| 686 | cpufreq_unregister_driver(&longhaul_driver); |
| 687 | kfree(longhaul_table); |
| 688 | } |
| 689 | |
| 690 | module_param (dont_scale_voltage, int, 0644); |
| 691 | MODULE_PARM_DESC(dont_scale_voltage, "Don't scale voltage of processor"); |
| 692 | |
| 693 | MODULE_AUTHOR ("Dave Jones <davej@codemonkey.org.uk>"); |
| 694 | MODULE_DESCRIPTION ("Longhaul driver for VIA Cyrix processors."); |
| 695 | MODULE_LICENSE ("GPL"); |
| 696 | |
| 697 | module_init(longhaul_init); |
| 698 | module_exit(longhaul_exit); |
| 699 | |