Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | * |
Dave Jones | 065b807 | 2005-05-31 19:03:46 -0700 | [diff] [blame^] | 7 | * Support : mark.langsdorf@amd.com |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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. |
Dave Jones | 065b807 | 2005-05-31 19:03:46 -0700 | [diff] [blame^] | 18 | * Originally developed by Paul Devriendt. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 |
Dave Jones | 065b807 | 2005-05-31 19:03:46 -0700 | [diff] [blame^] | 24 | * http://www.amd.com/us-en/assets/content_type/white_papers_and_tech_docs/30430.pdf |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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> |
Dave Jones | 065b807 | 2005-05-31 19:03:46 -0700 | [diff] [blame^] | 34 | #include <linux/cpumask.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 35 | |
| 36 | #include <asm/msr.h> |
| 37 | #include <asm/io.h> |
| 38 | #include <asm/delay.h> |
| 39 | |
| 40 | #ifdef CONFIG_X86_POWERNOW_K8_ACPI |
| 41 | #include <linux/acpi.h> |
| 42 | #include <acpi/processor.h> |
| 43 | #endif |
| 44 | |
| 45 | #define PFX "powernow-k8: " |
| 46 | #define BFX PFX "BIOS error: " |
Dave Jones | 065b807 | 2005-05-31 19:03:46 -0700 | [diff] [blame^] | 47 | #define VERSION "version 1.40.2" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 48 | #include "powernow-k8.h" |
| 49 | |
| 50 | /* serialize freq changes */ |
| 51 | static DECLARE_MUTEX(fidvid_sem); |
| 52 | |
| 53 | static struct powernow_k8_data *powernow_data[NR_CPUS]; |
| 54 | |
Dave Jones | 065b807 | 2005-05-31 19:03:46 -0700 | [diff] [blame^] | 55 | #ifndef CONFIG_SMP |
| 56 | static cpumask_t cpu_core_map[1]; |
| 57 | #endif |
| 58 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 59 | /* Return a frequency in MHz, given an input fid */ |
| 60 | static u32 find_freq_from_fid(u32 fid) |
| 61 | { |
| 62 | return 800 + (fid * 100); |
| 63 | } |
| 64 | |
| 65 | /* Return a frequency in KHz, given an input fid */ |
| 66 | static u32 find_khz_freq_from_fid(u32 fid) |
| 67 | { |
| 68 | return 1000 * find_freq_from_fid(fid); |
| 69 | } |
| 70 | |
| 71 | /* Return a voltage in miliVolts, given an input vid */ |
| 72 | static u32 find_millivolts_from_vid(struct powernow_k8_data *data, u32 vid) |
| 73 | { |
| 74 | return 1550-vid*25; |
| 75 | } |
| 76 | |
| 77 | /* Return the vco fid for an input fid |
| 78 | * |
| 79 | * Each "low" fid has corresponding "high" fid, and you can get to "low" fids |
| 80 | * only from corresponding high fids. This returns "high" fid corresponding to |
| 81 | * "low" one. |
| 82 | */ |
| 83 | static u32 convert_fid_to_vco_fid(u32 fid) |
| 84 | { |
| 85 | if (fid < HI_FID_TABLE_BOTTOM) { |
| 86 | return 8 + (2 * fid); |
| 87 | } else { |
| 88 | return fid; |
| 89 | } |
| 90 | } |
| 91 | |
| 92 | /* |
| 93 | * Return 1 if the pending bit is set. Unless we just instructed the processor |
| 94 | * to transition to a new state, seeing this bit set is really bad news. |
| 95 | */ |
| 96 | static int pending_bit_stuck(void) |
| 97 | { |
| 98 | u32 lo, hi; |
| 99 | |
| 100 | rdmsr(MSR_FIDVID_STATUS, lo, hi); |
| 101 | return lo & MSR_S_LO_CHANGE_PENDING ? 1 : 0; |
| 102 | } |
| 103 | |
| 104 | /* |
| 105 | * Update the global current fid / vid values from the status msr. |
| 106 | * Returns 1 on error. |
| 107 | */ |
| 108 | static int query_current_values_with_pending_wait(struct powernow_k8_data *data) |
| 109 | { |
| 110 | u32 lo, hi; |
| 111 | u32 i = 0; |
| 112 | |
| 113 | lo = MSR_S_LO_CHANGE_PENDING; |
| 114 | while (lo & MSR_S_LO_CHANGE_PENDING) { |
| 115 | if (i++ > 0x1000000) { |
| 116 | printk(KERN_ERR PFX "detected change pending stuck\n"); |
| 117 | return 1; |
| 118 | } |
| 119 | rdmsr(MSR_FIDVID_STATUS, lo, hi); |
| 120 | } |
| 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 | |
| 164 | if ((fid & INVALID_FID_MASK) || (data->currvid & INVALID_VID_MASK)) { |
| 165 | printk(KERN_ERR PFX "internal error - overflow on fid write\n"); |
| 166 | return 1; |
| 167 | } |
| 168 | |
| 169 | lo = fid | (data->currvid << MSR_C_LO_VID_SHIFT) | MSR_C_LO_INIT_FID_VID; |
| 170 | |
| 171 | dprintk("writing fid 0x%x, lo 0x%x, hi 0x%x\n", |
| 172 | fid, lo, data->plllock * PLL_LOCK_CONVERSION); |
| 173 | |
| 174 | wrmsr(MSR_FIDVID_CTL, lo, data->plllock * PLL_LOCK_CONVERSION); |
| 175 | |
| 176 | if (query_current_values_with_pending_wait(data)) |
| 177 | return 1; |
| 178 | |
| 179 | count_off_irt(data); |
| 180 | |
| 181 | if (savevid != data->currvid) { |
| 182 | printk(KERN_ERR PFX "vid change on fid trans, old 0x%x, new 0x%x\n", |
| 183 | savevid, data->currvid); |
| 184 | return 1; |
| 185 | } |
| 186 | |
| 187 | if (fid != data->currfid) { |
| 188 | printk(KERN_ERR PFX "fid trans failed, fid 0x%x, curr 0x%x\n", fid, |
| 189 | data->currfid); |
| 190 | return 1; |
| 191 | } |
| 192 | |
| 193 | return 0; |
| 194 | } |
| 195 | |
| 196 | /* Write a new vid to the hardware */ |
| 197 | static int write_new_vid(struct powernow_k8_data *data, u32 vid) |
| 198 | { |
| 199 | u32 lo; |
| 200 | u32 savefid = data->currfid; |
| 201 | |
| 202 | if ((data->currfid & INVALID_FID_MASK) || (vid & INVALID_VID_MASK)) { |
| 203 | printk(KERN_ERR PFX "internal error - overflow on vid write\n"); |
| 204 | return 1; |
| 205 | } |
| 206 | |
| 207 | lo = data->currfid | (vid << MSR_C_LO_VID_SHIFT) | MSR_C_LO_INIT_FID_VID; |
| 208 | |
| 209 | dprintk("writing vid 0x%x, lo 0x%x, hi 0x%x\n", |
| 210 | vid, lo, STOP_GRANT_5NS); |
| 211 | |
| 212 | wrmsr(MSR_FIDVID_CTL, lo, STOP_GRANT_5NS); |
| 213 | |
| 214 | if (query_current_values_with_pending_wait(data)) |
| 215 | return 1; |
| 216 | |
| 217 | if (savefid != data->currfid) { |
| 218 | printk(KERN_ERR PFX "fid changed on vid trans, old 0x%x new 0x%x\n", |
| 219 | savefid, data->currfid); |
| 220 | return 1; |
| 221 | } |
| 222 | |
| 223 | if (vid != data->currvid) { |
| 224 | printk(KERN_ERR PFX "vid trans failed, vid 0x%x, curr 0x%x\n", vid, |
| 225 | data->currvid); |
| 226 | return 1; |
| 227 | } |
| 228 | |
| 229 | return 0; |
| 230 | } |
| 231 | |
| 232 | /* |
| 233 | * Reduce the vid by the max of step or reqvid. |
| 234 | * Decreasing vid codes represent increasing voltages: |
| 235 | * vid of 0 is 1.550V, vid of 0x1e is 0.800V, vid of 0x1f is off. |
| 236 | */ |
| 237 | static int decrease_vid_code_by_step(struct powernow_k8_data *data, u32 reqvid, u32 step) |
| 238 | { |
| 239 | if ((data->currvid - reqvid) > step) |
| 240 | reqvid = data->currvid - step; |
| 241 | |
| 242 | if (write_new_vid(data, reqvid)) |
| 243 | return 1; |
| 244 | |
| 245 | count_off_vst(data); |
| 246 | |
| 247 | return 0; |
| 248 | } |
| 249 | |
| 250 | /* Change the fid and vid, by the 3 phases. */ |
| 251 | static int transition_fid_vid(struct powernow_k8_data *data, u32 reqfid, u32 reqvid) |
| 252 | { |
| 253 | if (core_voltage_pre_transition(data, reqvid)) |
| 254 | return 1; |
| 255 | |
| 256 | if (core_frequency_transition(data, reqfid)) |
| 257 | return 1; |
| 258 | |
| 259 | if (core_voltage_post_transition(data, reqvid)) |
| 260 | return 1; |
| 261 | |
| 262 | if (query_current_values_with_pending_wait(data)) |
| 263 | return 1; |
| 264 | |
| 265 | if ((reqfid != data->currfid) || (reqvid != data->currvid)) { |
| 266 | printk(KERN_ERR PFX "failed (cpu%d): req 0x%x 0x%x, curr 0x%x 0x%x\n", |
| 267 | smp_processor_id(), |
| 268 | reqfid, reqvid, data->currfid, data->currvid); |
| 269 | return 1; |
| 270 | } |
| 271 | |
| 272 | dprintk("transitioned (cpu%d): new fid 0x%x, vid 0x%x\n", |
| 273 | smp_processor_id(), data->currfid, data->currvid); |
| 274 | |
| 275 | return 0; |
| 276 | } |
| 277 | |
| 278 | /* Phase 1 - core voltage transition ... setup voltage */ |
| 279 | static int core_voltage_pre_transition(struct powernow_k8_data *data, u32 reqvid) |
| 280 | { |
| 281 | u32 rvosteps = data->rvo; |
| 282 | u32 savefid = data->currfid; |
Dave Jones | 065b807 | 2005-05-31 19:03:46 -0700 | [diff] [blame^] | 283 | u32 maxvid, lo; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 284 | |
| 285 | dprintk("ph1 (cpu%d): start, currfid 0x%x, currvid 0x%x, reqvid 0x%x, rvo 0x%x\n", |
| 286 | smp_processor_id(), |
| 287 | data->currfid, data->currvid, reqvid, data->rvo); |
| 288 | |
Dave Jones | 065b807 | 2005-05-31 19:03:46 -0700 | [diff] [blame^] | 289 | rdmsr(MSR_FIDVID_STATUS, lo, maxvid); |
| 290 | maxvid = 0x1f & (maxvid >> 16); |
| 291 | dprintk("ph1 maxvid=0x%x\n", maxvid); |
| 292 | if (reqvid < maxvid) /* lower numbers are higher voltages */ |
| 293 | reqvid = maxvid; |
| 294 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 295 | while (data->currvid > reqvid) { |
| 296 | dprintk("ph1: curr 0x%x, req vid 0x%x\n", |
| 297 | data->currvid, reqvid); |
| 298 | if (decrease_vid_code_by_step(data, reqvid, data->vidmvs)) |
| 299 | return 1; |
| 300 | } |
| 301 | |
Dave Jones | 065b807 | 2005-05-31 19:03:46 -0700 | [diff] [blame^] | 302 | while ((rvosteps > 0) && ((data->rvo + data->currvid) > reqvid)) { |
| 303 | if (data->currvid == maxvid) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 304 | rvosteps = 0; |
| 305 | } else { |
| 306 | dprintk("ph1: changing vid for rvo, req 0x%x\n", |
| 307 | data->currvid - 1); |
| 308 | if (decrease_vid_code_by_step(data, data->currvid - 1, 1)) |
| 309 | return 1; |
| 310 | rvosteps--; |
| 311 | } |
| 312 | } |
| 313 | |
| 314 | if (query_current_values_with_pending_wait(data)) |
| 315 | return 1; |
| 316 | |
| 317 | if (savefid != data->currfid) { |
| 318 | printk(KERN_ERR PFX "ph1 err, currfid changed 0x%x\n", data->currfid); |
| 319 | return 1; |
| 320 | } |
| 321 | |
| 322 | dprintk("ph1 complete, currfid 0x%x, currvid 0x%x\n", |
| 323 | data->currfid, data->currvid); |
| 324 | |
| 325 | return 0; |
| 326 | } |
| 327 | |
| 328 | /* Phase 2 - core frequency transition */ |
| 329 | static int core_frequency_transition(struct powernow_k8_data *data, u32 reqfid) |
| 330 | { |
| 331 | u32 vcoreqfid, vcocurrfid, vcofiddiff, savevid = data->currvid; |
| 332 | |
| 333 | if ((reqfid < HI_FID_TABLE_BOTTOM) && (data->currfid < HI_FID_TABLE_BOTTOM)) { |
| 334 | printk(KERN_ERR PFX "ph2: illegal lo-lo transition 0x%x 0x%x\n", |
| 335 | reqfid, data->currfid); |
| 336 | return 1; |
| 337 | } |
| 338 | |
| 339 | if (data->currfid == reqfid) { |
| 340 | printk(KERN_ERR PFX "ph2 null fid transition 0x%x\n", data->currfid); |
| 341 | return 0; |
| 342 | } |
| 343 | |
| 344 | dprintk("ph2 (cpu%d): starting, currfid 0x%x, currvid 0x%x, reqfid 0x%x\n", |
| 345 | smp_processor_id(), |
| 346 | data->currfid, data->currvid, reqfid); |
| 347 | |
| 348 | vcoreqfid = convert_fid_to_vco_fid(reqfid); |
| 349 | vcocurrfid = convert_fid_to_vco_fid(data->currfid); |
| 350 | vcofiddiff = vcocurrfid > vcoreqfid ? vcocurrfid - vcoreqfid |
| 351 | : vcoreqfid - vcocurrfid; |
| 352 | |
| 353 | while (vcofiddiff > 2) { |
| 354 | if (reqfid > data->currfid) { |
| 355 | if (data->currfid > LO_FID_TABLE_TOP) { |
| 356 | if (write_new_fid(data, data->currfid + 2)) { |
| 357 | return 1; |
| 358 | } |
| 359 | } else { |
| 360 | if (write_new_fid |
| 361 | (data, 2 + convert_fid_to_vco_fid(data->currfid))) { |
| 362 | return 1; |
| 363 | } |
| 364 | } |
| 365 | } else { |
| 366 | if (write_new_fid(data, data->currfid - 2)) |
| 367 | return 1; |
| 368 | } |
| 369 | |
| 370 | vcocurrfid = convert_fid_to_vco_fid(data->currfid); |
| 371 | vcofiddiff = vcocurrfid > vcoreqfid ? vcocurrfid - vcoreqfid |
| 372 | : vcoreqfid - vcocurrfid; |
| 373 | } |
| 374 | |
| 375 | if (write_new_fid(data, reqfid)) |
| 376 | return 1; |
| 377 | |
| 378 | if (query_current_values_with_pending_wait(data)) |
| 379 | return 1; |
| 380 | |
| 381 | if (data->currfid != reqfid) { |
| 382 | printk(KERN_ERR PFX |
| 383 | "ph2: mismatch, failed fid transition, curr 0x%x, req 0x%x\n", |
| 384 | data->currfid, reqfid); |
| 385 | return 1; |
| 386 | } |
| 387 | |
| 388 | if (savevid != data->currvid) { |
| 389 | printk(KERN_ERR PFX "ph2: vid changed, save 0x%x, curr 0x%x\n", |
| 390 | savevid, data->currvid); |
| 391 | return 1; |
| 392 | } |
| 393 | |
| 394 | dprintk("ph2 complete, currfid 0x%x, currvid 0x%x\n", |
| 395 | data->currfid, data->currvid); |
| 396 | |
| 397 | return 0; |
| 398 | } |
| 399 | |
| 400 | /* Phase 3 - core voltage transition flow ... jump to the final vid. */ |
| 401 | static int core_voltage_post_transition(struct powernow_k8_data *data, u32 reqvid) |
| 402 | { |
| 403 | u32 savefid = data->currfid; |
| 404 | u32 savereqvid = reqvid; |
| 405 | |
| 406 | dprintk("ph3 (cpu%d): starting, currfid 0x%x, currvid 0x%x\n", |
| 407 | smp_processor_id(), |
| 408 | data->currfid, data->currvid); |
| 409 | |
| 410 | if (reqvid != data->currvid) { |
| 411 | if (write_new_vid(data, reqvid)) |
| 412 | return 1; |
| 413 | |
| 414 | if (savefid != data->currfid) { |
| 415 | printk(KERN_ERR PFX |
| 416 | "ph3: bad fid change, save 0x%x, curr 0x%x\n", |
| 417 | savefid, data->currfid); |
| 418 | return 1; |
| 419 | } |
| 420 | |
| 421 | if (data->currvid != reqvid) { |
| 422 | printk(KERN_ERR PFX |
| 423 | "ph3: failed vid transition\n, req 0x%x, curr 0x%x", |
| 424 | reqvid, data->currvid); |
| 425 | return 1; |
| 426 | } |
| 427 | } |
| 428 | |
| 429 | if (query_current_values_with_pending_wait(data)) |
| 430 | return 1; |
| 431 | |
| 432 | if (savereqvid != data->currvid) { |
| 433 | dprintk("ph3 failed, currvid 0x%x\n", data->currvid); |
| 434 | return 1; |
| 435 | } |
| 436 | |
| 437 | if (savefid != data->currfid) { |
| 438 | dprintk("ph3 failed, currfid changed 0x%x\n", |
| 439 | data->currfid); |
| 440 | return 1; |
| 441 | } |
| 442 | |
| 443 | dprintk("ph3 complete, currfid 0x%x, currvid 0x%x\n", |
| 444 | data->currfid, data->currvid); |
| 445 | |
| 446 | return 0; |
| 447 | } |
| 448 | |
| 449 | static int check_supported_cpu(unsigned int cpu) |
| 450 | { |
| 451 | cpumask_t oldmask = CPU_MASK_ALL; |
| 452 | u32 eax, ebx, ecx, edx; |
| 453 | unsigned int rc = 0; |
| 454 | |
| 455 | oldmask = current->cpus_allowed; |
| 456 | set_cpus_allowed(current, cpumask_of_cpu(cpu)); |
| 457 | schedule(); |
| 458 | |
| 459 | if (smp_processor_id() != cpu) { |
| 460 | printk(KERN_ERR "limiting to cpu %u failed\n", cpu); |
| 461 | goto out; |
| 462 | } |
| 463 | |
| 464 | if (current_cpu_data.x86_vendor != X86_VENDOR_AMD) |
| 465 | goto out; |
| 466 | |
| 467 | eax = cpuid_eax(CPUID_PROCESSOR_SIGNATURE); |
| 468 | if (((eax & CPUID_USE_XFAM_XMOD) != CPUID_USE_XFAM_XMOD) || |
| 469 | ((eax & CPUID_XFAM) != CPUID_XFAM_K8) || |
| 470 | ((eax & CPUID_XMOD) > CPUID_XMOD_REV_E)) { |
| 471 | printk(KERN_INFO PFX "Processor cpuid %x not supported\n", eax); |
| 472 | goto out; |
| 473 | } |
| 474 | |
| 475 | eax = cpuid_eax(CPUID_GET_MAX_CAPABILITIES); |
| 476 | if (eax < CPUID_FREQ_VOLT_CAPABILITIES) { |
| 477 | printk(KERN_INFO PFX |
| 478 | "No frequency change capabilities detected\n"); |
| 479 | goto out; |
| 480 | } |
| 481 | |
| 482 | cpuid(CPUID_FREQ_VOLT_CAPABILITIES, &eax, &ebx, &ecx, &edx); |
| 483 | if ((edx & P_STATE_TRANSITION_CAPABLE) != P_STATE_TRANSITION_CAPABLE) { |
| 484 | printk(KERN_INFO PFX "Power state transitions not supported\n"); |
| 485 | goto out; |
| 486 | } |
| 487 | |
| 488 | rc = 1; |
| 489 | |
| 490 | out: |
| 491 | set_cpus_allowed(current, oldmask); |
| 492 | schedule(); |
| 493 | return rc; |
| 494 | |
| 495 | } |
| 496 | |
| 497 | static int check_pst_table(struct powernow_k8_data *data, struct pst_s *pst, u8 maxvid) |
| 498 | { |
| 499 | unsigned int j; |
| 500 | u8 lastfid = 0xff; |
| 501 | |
| 502 | for (j = 0; j < data->numps; j++) { |
| 503 | if (pst[j].vid > LEAST_VID) { |
| 504 | printk(KERN_ERR PFX "vid %d invalid : 0x%x\n", j, pst[j].vid); |
| 505 | return -EINVAL; |
| 506 | } |
| 507 | if (pst[j].vid < data->rvo) { /* vid + rvo >= 0 */ |
| 508 | printk(KERN_ERR BFX "0 vid exceeded with pstate %d\n", j); |
| 509 | return -ENODEV; |
| 510 | } |
| 511 | if (pst[j].vid < maxvid + data->rvo) { /* vid + rvo >= maxvid */ |
| 512 | printk(KERN_ERR BFX "maxvid exceeded with pstate %d\n", j); |
| 513 | return -ENODEV; |
| 514 | } |
| 515 | if ((pst[j].fid > MAX_FID) |
| 516 | || (pst[j].fid & 1) |
| 517 | || (j && (pst[j].fid < HI_FID_TABLE_BOTTOM))) { |
| 518 | /* Only first fid is allowed to be in "low" range */ |
| 519 | printk(KERN_ERR PFX "two low fids - %d : 0x%x\n", j, pst[j].fid); |
| 520 | return -EINVAL; |
| 521 | } |
| 522 | if (pst[j].fid < lastfid) |
| 523 | lastfid = pst[j].fid; |
| 524 | } |
| 525 | if (lastfid & 1) { |
| 526 | printk(KERN_ERR PFX "lastfid invalid\n"); |
| 527 | return -EINVAL; |
| 528 | } |
| 529 | if (lastfid > LO_FID_TABLE_TOP) |
| 530 | printk(KERN_INFO PFX "first fid not from lo freq table\n"); |
| 531 | |
| 532 | return 0; |
| 533 | } |
| 534 | |
| 535 | static void print_basics(struct powernow_k8_data *data) |
| 536 | { |
| 537 | int j; |
| 538 | for (j = 0; j < data->numps; j++) { |
| 539 | if (data->powernow_table[j].frequency != CPUFREQ_ENTRY_INVALID) |
| 540 | printk(KERN_INFO PFX " %d : fid 0x%x (%d MHz), vid 0x%x (%d mV)\n", j, |
| 541 | data->powernow_table[j].index & 0xff, |
| 542 | data->powernow_table[j].frequency/1000, |
| 543 | data->powernow_table[j].index >> 8, |
| 544 | find_millivolts_from_vid(data, data->powernow_table[j].index >> 8)); |
| 545 | } |
| 546 | if (data->batps) |
| 547 | printk(KERN_INFO PFX "Only %d pstates on battery\n", data->batps); |
| 548 | } |
| 549 | |
| 550 | static int fill_powernow_table(struct powernow_k8_data *data, struct pst_s *pst, u8 maxvid) |
| 551 | { |
| 552 | struct cpufreq_frequency_table *powernow_table; |
| 553 | unsigned int j; |
| 554 | |
| 555 | if (data->batps) { /* use ACPI support to get full speed on mains power */ |
| 556 | printk(KERN_WARNING PFX "Only %d pstates usable (use ACPI driver for full range\n", data->batps); |
| 557 | data->numps = data->batps; |
| 558 | } |
| 559 | |
| 560 | for ( j=1; j<data->numps; j++ ) { |
| 561 | if (pst[j-1].fid >= pst[j].fid) { |
| 562 | printk(KERN_ERR PFX "PST out of sequence\n"); |
| 563 | return -EINVAL; |
| 564 | } |
| 565 | } |
| 566 | |
| 567 | if (data->numps < 2) { |
| 568 | printk(KERN_ERR PFX "no p states to transition\n"); |
| 569 | return -ENODEV; |
| 570 | } |
| 571 | |
| 572 | if (check_pst_table(data, pst, maxvid)) |
| 573 | return -EINVAL; |
| 574 | |
| 575 | powernow_table = kmalloc((sizeof(struct cpufreq_frequency_table) |
| 576 | * (data->numps + 1)), GFP_KERNEL); |
| 577 | if (!powernow_table) { |
| 578 | printk(KERN_ERR PFX "powernow_table memory alloc failure\n"); |
| 579 | return -ENOMEM; |
| 580 | } |
| 581 | |
| 582 | for (j = 0; j < data->numps; j++) { |
| 583 | powernow_table[j].index = pst[j].fid; /* lower 8 bits */ |
| 584 | powernow_table[j].index |= (pst[j].vid << 8); /* upper 8 bits */ |
| 585 | powernow_table[j].frequency = find_khz_freq_from_fid(pst[j].fid); |
| 586 | } |
| 587 | powernow_table[data->numps].frequency = CPUFREQ_TABLE_END; |
| 588 | powernow_table[data->numps].index = 0; |
| 589 | |
| 590 | if (query_current_values_with_pending_wait(data)) { |
| 591 | kfree(powernow_table); |
| 592 | return -EIO; |
| 593 | } |
| 594 | |
| 595 | dprintk("cfid 0x%x, cvid 0x%x\n", data->currfid, data->currvid); |
| 596 | data->powernow_table = powernow_table; |
| 597 | print_basics(data); |
| 598 | |
| 599 | for (j = 0; j < data->numps; j++) |
| 600 | if ((pst[j].fid==data->currfid) && (pst[j].vid==data->currvid)) |
| 601 | return 0; |
| 602 | |
| 603 | dprintk("currfid/vid do not match PST, ignoring\n"); |
| 604 | return 0; |
| 605 | } |
| 606 | |
| 607 | /* Find and validate the PSB/PST table in BIOS. */ |
| 608 | static int find_psb_table(struct powernow_k8_data *data) |
| 609 | { |
| 610 | struct psb_s *psb; |
| 611 | unsigned int i; |
| 612 | u32 mvs; |
| 613 | u8 maxvid; |
| 614 | u32 cpst = 0; |
| 615 | u32 thiscpuid; |
| 616 | |
| 617 | for (i = 0xc0000; i < 0xffff0; i += 0x10) { |
| 618 | /* Scan BIOS looking for the signature. */ |
| 619 | /* It can not be at ffff0 - it is too big. */ |
| 620 | |
| 621 | psb = phys_to_virt(i); |
| 622 | if (memcmp(psb, PSB_ID_STRING, PSB_ID_STRING_LEN) != 0) |
| 623 | continue; |
| 624 | |
| 625 | dprintk("found PSB header at 0x%p\n", psb); |
| 626 | |
| 627 | dprintk("table vers: 0x%x\n", psb->tableversion); |
| 628 | if (psb->tableversion != PSB_VERSION_1_4) { |
| 629 | printk(KERN_INFO BFX "PSB table is not v1.4\n"); |
| 630 | return -ENODEV; |
| 631 | } |
| 632 | |
| 633 | dprintk("flags: 0x%x\n", psb->flags1); |
| 634 | if (psb->flags1) { |
| 635 | printk(KERN_ERR BFX "unknown flags\n"); |
| 636 | return -ENODEV; |
| 637 | } |
| 638 | |
| 639 | data->vstable = psb->vstable; |
| 640 | dprintk("voltage stabilization time: %d(*20us)\n", data->vstable); |
| 641 | |
| 642 | dprintk("flags2: 0x%x\n", psb->flags2); |
| 643 | data->rvo = psb->flags2 & 3; |
| 644 | data->irt = ((psb->flags2) >> 2) & 3; |
| 645 | mvs = ((psb->flags2) >> 4) & 3; |
| 646 | data->vidmvs = 1 << mvs; |
| 647 | data->batps = ((psb->flags2) >> 6) & 3; |
| 648 | |
| 649 | dprintk("ramp voltage offset: %d\n", data->rvo); |
| 650 | dprintk("isochronous relief time: %d\n", data->irt); |
| 651 | dprintk("maximum voltage step: %d - 0x%x\n", mvs, data->vidmvs); |
| 652 | |
| 653 | dprintk("numpst: 0x%x\n", psb->num_tables); |
| 654 | cpst = psb->num_tables; |
| 655 | if ((psb->cpuid == 0x00000fc0) || (psb->cpuid == 0x00000fe0) ){ |
| 656 | thiscpuid = cpuid_eax(CPUID_PROCESSOR_SIGNATURE); |
| 657 | if ((thiscpuid == 0x00000fc0) || (thiscpuid == 0x00000fe0) ) { |
| 658 | cpst = 1; |
| 659 | } |
| 660 | } |
| 661 | if (cpst != 1) { |
| 662 | printk(KERN_ERR BFX "numpst must be 1\n"); |
| 663 | return -ENODEV; |
| 664 | } |
| 665 | |
| 666 | data->plllock = psb->plllocktime; |
| 667 | dprintk("plllocktime: 0x%x (units 1us)\n", psb->plllocktime); |
| 668 | dprintk("maxfid: 0x%x\n", psb->maxfid); |
| 669 | dprintk("maxvid: 0x%x\n", psb->maxvid); |
| 670 | maxvid = psb->maxvid; |
| 671 | |
| 672 | data->numps = psb->numps; |
| 673 | dprintk("numpstates: 0x%x\n", data->numps); |
| 674 | return fill_powernow_table(data, (struct pst_s *)(psb+1), maxvid); |
| 675 | } |
| 676 | /* |
| 677 | * If you see this message, complain to BIOS manufacturer. If |
| 678 | * he tells you "we do not support Linux" or some similar |
| 679 | * nonsense, remember that Windows 2000 uses the same legacy |
| 680 | * mechanism that the old Linux PSB driver uses. Tell them it |
| 681 | * is broken with Windows 2000. |
| 682 | * |
| 683 | * The reference to the AMD documentation is chapter 9 in the |
| 684 | * BIOS and Kernel Developer's Guide, which is available on |
| 685 | * www.amd.com |
| 686 | */ |
Dave Jones | 065b807 | 2005-05-31 19:03:46 -0700 | [diff] [blame^] | 687 | printk(KERN_INFO PFX "BIOS error - no PSB or ACPI _PSS objects\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 688 | return -ENODEV; |
| 689 | } |
| 690 | |
| 691 | #ifdef CONFIG_X86_POWERNOW_K8_ACPI |
| 692 | static void powernow_k8_acpi_pst_values(struct powernow_k8_data *data, unsigned int index) |
| 693 | { |
| 694 | if (!data->acpi_data.state_count) |
| 695 | return; |
| 696 | |
| 697 | data->irt = (data->acpi_data.states[index].control >> IRT_SHIFT) & IRT_MASK; |
| 698 | data->rvo = (data->acpi_data.states[index].control >> RVO_SHIFT) & RVO_MASK; |
| 699 | data->plllock = (data->acpi_data.states[index].control >> PLL_L_SHIFT) & PLL_L_MASK; |
| 700 | data->vidmvs = 1 << ((data->acpi_data.states[index].control >> MVS_SHIFT) & MVS_MASK); |
| 701 | data->vstable = (data->acpi_data.states[index].control >> VST_SHIFT) & VST_MASK; |
| 702 | } |
| 703 | |
| 704 | static int powernow_k8_cpu_init_acpi(struct powernow_k8_data *data) |
| 705 | { |
| 706 | int i; |
| 707 | int cntlofreq = 0; |
| 708 | struct cpufreq_frequency_table *powernow_table; |
| 709 | |
| 710 | if (acpi_processor_register_performance(&data->acpi_data, data->cpu)) { |
Dave Jones | 065b807 | 2005-05-31 19:03:46 -0700 | [diff] [blame^] | 711 | dprintk("register performance failed: bad ACPI data\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 712 | return -EIO; |
| 713 | } |
| 714 | |
| 715 | /* verify the data contained in the ACPI structures */ |
| 716 | if (data->acpi_data.state_count <= 1) { |
| 717 | dprintk("No ACPI P-States\n"); |
| 718 | goto err_out; |
| 719 | } |
| 720 | |
| 721 | if ((data->acpi_data.control_register.space_id != ACPI_ADR_SPACE_FIXED_HARDWARE) || |
| 722 | (data->acpi_data.status_register.space_id != ACPI_ADR_SPACE_FIXED_HARDWARE)) { |
| 723 | dprintk("Invalid control/status registers (%x - %x)\n", |
| 724 | data->acpi_data.control_register.space_id, |
| 725 | data->acpi_data.status_register.space_id); |
| 726 | goto err_out; |
| 727 | } |
| 728 | |
| 729 | /* fill in data->powernow_table */ |
| 730 | powernow_table = kmalloc((sizeof(struct cpufreq_frequency_table) |
| 731 | * (data->acpi_data.state_count + 1)), GFP_KERNEL); |
| 732 | if (!powernow_table) { |
| 733 | dprintk("powernow_table memory alloc failure\n"); |
| 734 | goto err_out; |
| 735 | } |
| 736 | |
| 737 | for (i = 0; i < data->acpi_data.state_count; i++) { |
| 738 | u32 fid = data->acpi_data.states[i].control & FID_MASK; |
| 739 | u32 vid = (data->acpi_data.states[i].control >> VID_SHIFT) & VID_MASK; |
| 740 | |
| 741 | dprintk(" %d : fid 0x%x, vid 0x%x\n", i, fid, vid); |
| 742 | |
| 743 | powernow_table[i].index = fid; /* lower 8 bits */ |
| 744 | powernow_table[i].index |= (vid << 8); /* upper 8 bits */ |
| 745 | powernow_table[i].frequency = find_khz_freq_from_fid(fid); |
| 746 | |
| 747 | /* verify frequency is OK */ |
| 748 | if ((powernow_table[i].frequency > (MAX_FREQ * 1000)) || |
| 749 | (powernow_table[i].frequency < (MIN_FREQ * 1000))) { |
| 750 | dprintk("invalid freq %u kHz, ignoring\n", powernow_table[i].frequency); |
| 751 | powernow_table[i].frequency = CPUFREQ_ENTRY_INVALID; |
| 752 | continue; |
| 753 | } |
| 754 | |
| 755 | /* verify voltage is OK - BIOSs are using "off" to indicate invalid */ |
| 756 | if (vid == 0x1f) { |
| 757 | dprintk("invalid vid %u, ignoring\n", vid); |
| 758 | powernow_table[i].frequency = CPUFREQ_ENTRY_INVALID; |
| 759 | continue; |
| 760 | } |
| 761 | |
Dave Jones | 065b807 | 2005-05-31 19:03:46 -0700 | [diff] [blame^] | 762 | /* verify only 1 entry from the lo frequency table */ |
| 763 | if (fid < HI_FID_TABLE_BOTTOM) { |
| 764 | if (cntlofreq) { |
| 765 | /* if both entries are the same, ignore this |
| 766 | * one... |
| 767 | */ |
| 768 | if ((powernow_table[i].frequency != powernow_table[cntlofreq].frequency) || |
| 769 | (powernow_table[i].index != powernow_table[cntlofreq].index)) { |
| 770 | printk(KERN_ERR PFX "Too many lo freq table entries\n"); |
| 771 | goto err_out_mem; |
| 772 | } |
| 773 | |
| 774 | dprintk("double low frequency table entry, ignoring it.\n"); |
| 775 | powernow_table[i].frequency = CPUFREQ_ENTRY_INVALID; |
| 776 | continue; |
| 777 | } else |
| 778 | cntlofreq = i; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 779 | } |
| 780 | |
| 781 | if (powernow_table[i].frequency != (data->acpi_data.states[i].core_frequency * 1000)) { |
| 782 | printk(KERN_INFO PFX "invalid freq entries %u kHz vs. %u kHz\n", |
| 783 | powernow_table[i].frequency, |
| 784 | (unsigned int) (data->acpi_data.states[i].core_frequency * 1000)); |
| 785 | powernow_table[i].frequency = CPUFREQ_ENTRY_INVALID; |
| 786 | continue; |
| 787 | } |
| 788 | } |
| 789 | |
| 790 | powernow_table[data->acpi_data.state_count].frequency = CPUFREQ_TABLE_END; |
| 791 | powernow_table[data->acpi_data.state_count].index = 0; |
| 792 | data->powernow_table = powernow_table; |
| 793 | |
| 794 | /* fill in data */ |
| 795 | data->numps = data->acpi_data.state_count; |
| 796 | print_basics(data); |
| 797 | powernow_k8_acpi_pst_values(data, 0); |
| 798 | |
| 799 | /* notify BIOS that we exist */ |
| 800 | acpi_processor_notify_smm(THIS_MODULE); |
| 801 | |
| 802 | return 0; |
| 803 | |
| 804 | err_out_mem: |
| 805 | kfree(powernow_table); |
| 806 | |
| 807 | err_out: |
| 808 | acpi_processor_unregister_performance(&data->acpi_data, data->cpu); |
| 809 | |
| 810 | /* data->acpi_data.state_count informs us at ->exit() whether ACPI was used */ |
| 811 | data->acpi_data.state_count = 0; |
| 812 | |
| 813 | return -ENODEV; |
| 814 | } |
| 815 | |
| 816 | static void powernow_k8_cpu_exit_acpi(struct powernow_k8_data *data) |
| 817 | { |
| 818 | if (data->acpi_data.state_count) |
| 819 | acpi_processor_unregister_performance(&data->acpi_data, data->cpu); |
| 820 | } |
| 821 | |
| 822 | #else |
| 823 | static int powernow_k8_cpu_init_acpi(struct powernow_k8_data *data) { return -ENODEV; } |
| 824 | static void powernow_k8_cpu_exit_acpi(struct powernow_k8_data *data) { return; } |
| 825 | static void powernow_k8_acpi_pst_values(struct powernow_k8_data *data, unsigned int index) { return; } |
| 826 | #endif /* CONFIG_X86_POWERNOW_K8_ACPI */ |
| 827 | |
| 828 | /* Take a frequency, and issue the fid/vid transition command */ |
| 829 | static int transition_frequency(struct powernow_k8_data *data, unsigned int index) |
| 830 | { |
| 831 | u32 fid; |
| 832 | u32 vid; |
Dave Jones | 065b807 | 2005-05-31 19:03:46 -0700 | [diff] [blame^] | 833 | int res, i; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 834 | struct cpufreq_freqs freqs; |
| 835 | |
| 836 | dprintk("cpu %d transition to index %u\n", smp_processor_id(), index); |
| 837 | |
| 838 | /* fid are the lower 8 bits of the index we stored into |
| 839 | * the cpufreq frequency table in find_psb_table, vid are |
| 840 | * the upper 8 bits. |
| 841 | */ |
| 842 | |
| 843 | fid = data->powernow_table[index].index & 0xFF; |
| 844 | vid = (data->powernow_table[index].index & 0xFF00) >> 8; |
| 845 | |
| 846 | dprintk("table matched fid 0x%x, giving vid 0x%x\n", fid, vid); |
| 847 | |
| 848 | if (query_current_values_with_pending_wait(data)) |
| 849 | return 1; |
| 850 | |
| 851 | if ((data->currvid == vid) && (data->currfid == fid)) { |
| 852 | dprintk("target matches current values (fid 0x%x, vid 0x%x)\n", |
| 853 | fid, vid); |
| 854 | return 0; |
| 855 | } |
| 856 | |
| 857 | if ((fid < HI_FID_TABLE_BOTTOM) && (data->currfid < HI_FID_TABLE_BOTTOM)) { |
Dave Jones | 065b807 | 2005-05-31 19:03:46 -0700 | [diff] [blame^] | 858 | printk(KERN_ERR PFX |
| 859 | "ignoring illegal change in lo freq table-%x to 0x%x\n", |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 860 | data->currfid, fid); |
| 861 | return 1; |
| 862 | } |
| 863 | |
| 864 | dprintk("cpu %d, changing to fid 0x%x, vid 0x%x\n", |
| 865 | smp_processor_id(), fid, vid); |
| 866 | |
| 867 | freqs.cpu = data->cpu; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 868 | freqs.old = find_khz_freq_from_fid(data->currfid); |
| 869 | freqs.new = find_khz_freq_from_fid(fid); |
Dave Jones | 065b807 | 2005-05-31 19:03:46 -0700 | [diff] [blame^] | 870 | for_each_cpu_mask(i, cpu_core_map[data->cpu]) { |
| 871 | freqs.cpu = i; |
| 872 | cpufreq_notify_transition(&freqs, CPUFREQ_PRECHANGE); |
| 873 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 874 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 875 | res = transition_fid_vid(data, fid, vid); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 876 | |
| 877 | freqs.new = find_khz_freq_from_fid(data->currfid); |
Dave Jones | 065b807 | 2005-05-31 19:03:46 -0700 | [diff] [blame^] | 878 | for_each_cpu_mask(i, cpu_core_map[data->cpu]) { |
| 879 | freqs.cpu = i; |
| 880 | cpufreq_notify_transition(&freqs, CPUFREQ_POSTCHANGE); |
| 881 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 882 | return res; |
| 883 | } |
| 884 | |
| 885 | /* Driver entry point to switch to the target frequency */ |
| 886 | static int powernowk8_target(struct cpufreq_policy *pol, unsigned targfreq, unsigned relation) |
| 887 | { |
| 888 | cpumask_t oldmask = CPU_MASK_ALL; |
| 889 | struct powernow_k8_data *data = powernow_data[pol->cpu]; |
| 890 | u32 checkfid = data->currfid; |
| 891 | u32 checkvid = data->currvid; |
| 892 | unsigned int newstate; |
| 893 | int ret = -EIO; |
Dave Jones | 065b807 | 2005-05-31 19:03:46 -0700 | [diff] [blame^] | 894 | int i; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 895 | |
| 896 | /* only run on specific CPU from here on */ |
| 897 | oldmask = current->cpus_allowed; |
| 898 | set_cpus_allowed(current, cpumask_of_cpu(pol->cpu)); |
| 899 | schedule(); |
| 900 | |
| 901 | if (smp_processor_id() != pol->cpu) { |
| 902 | printk(KERN_ERR "limiting to cpu %u failed\n", pol->cpu); |
| 903 | goto err_out; |
| 904 | } |
| 905 | |
| 906 | if (pending_bit_stuck()) { |
| 907 | printk(KERN_ERR PFX "failing targ, change pending bit set\n"); |
| 908 | goto err_out; |
| 909 | } |
| 910 | |
| 911 | dprintk("targ: cpu %d, %d kHz, min %d, max %d, relation %d\n", |
| 912 | pol->cpu, targfreq, pol->min, pol->max, relation); |
| 913 | |
| 914 | if (query_current_values_with_pending_wait(data)) { |
| 915 | ret = -EIO; |
| 916 | goto err_out; |
| 917 | } |
| 918 | |
| 919 | dprintk("targ: curr fid 0x%x, vid 0x%x\n", |
| 920 | data->currfid, data->currvid); |
| 921 | |
| 922 | if ((checkvid != data->currvid) || (checkfid != data->currfid)) { |
Dave Jones | 065b807 | 2005-05-31 19:03:46 -0700 | [diff] [blame^] | 923 | printk(KERN_INFO PFX |
| 924 | "error - out of sync, fix 0x%x 0x%x, vid 0x%x 0x%x\n", |
| 925 | checkfid, data->currfid, checkvid, data->currvid); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 926 | } |
| 927 | |
| 928 | if (cpufreq_frequency_table_target(pol, data->powernow_table, targfreq, relation, &newstate)) |
| 929 | goto err_out; |
| 930 | |
Dave Jones | 065b807 | 2005-05-31 19:03:46 -0700 | [diff] [blame^] | 931 | down(&fidvid_sem); |
| 932 | |
| 933 | for_each_cpu_mask(i, cpu_core_map[pol->cpu]) { |
| 934 | /* make sure the sibling is initialized */ |
| 935 | if (!powernow_data[i]) { |
| 936 | ret = 0; |
| 937 | up(&fidvid_sem); |
| 938 | goto err_out; |
| 939 | } |
| 940 | } |
| 941 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 942 | powernow_k8_acpi_pst_values(data, newstate); |
| 943 | |
| 944 | if (transition_frequency(data, newstate)) { |
| 945 | printk(KERN_ERR PFX "transition frequency failed\n"); |
| 946 | ret = 1; |
Dave Jones | 065b807 | 2005-05-31 19:03:46 -0700 | [diff] [blame^] | 947 | up(&fidvid_sem); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 948 | goto err_out; |
| 949 | } |
| 950 | |
Dave Jones | 065b807 | 2005-05-31 19:03:46 -0700 | [diff] [blame^] | 951 | /* Update all the fid/vids of our siblings */ |
| 952 | for_each_cpu_mask(i, cpu_core_map[pol->cpu]) { |
| 953 | powernow_data[i]->currvid = data->currvid; |
| 954 | powernow_data[i]->currfid = data->currfid; |
| 955 | } |
| 956 | up(&fidvid_sem); |
| 957 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 958 | pol->cur = find_khz_freq_from_fid(data->currfid); |
| 959 | ret = 0; |
| 960 | |
| 961 | err_out: |
| 962 | set_cpus_allowed(current, oldmask); |
| 963 | schedule(); |
| 964 | |
| 965 | return ret; |
| 966 | } |
| 967 | |
| 968 | /* Driver entry point to verify the policy and range of frequencies */ |
| 969 | static int powernowk8_verify(struct cpufreq_policy *pol) |
| 970 | { |
| 971 | struct powernow_k8_data *data = powernow_data[pol->cpu]; |
| 972 | |
| 973 | return cpufreq_frequency_table_verify(pol, data->powernow_table); |
| 974 | } |
| 975 | |
| 976 | /* per CPU init entry point to the driver */ |
| 977 | static int __init powernowk8_cpu_init(struct cpufreq_policy *pol) |
| 978 | { |
| 979 | struct powernow_k8_data *data; |
| 980 | cpumask_t oldmask = CPU_MASK_ALL; |
| 981 | int rc; |
| 982 | |
| 983 | if (!check_supported_cpu(pol->cpu)) |
| 984 | return -ENODEV; |
| 985 | |
| 986 | data = kmalloc(sizeof(struct powernow_k8_data), GFP_KERNEL); |
| 987 | if (!data) { |
| 988 | printk(KERN_ERR PFX "unable to alloc powernow_k8_data"); |
| 989 | return -ENOMEM; |
| 990 | } |
| 991 | memset(data,0,sizeof(struct powernow_k8_data)); |
| 992 | |
| 993 | data->cpu = pol->cpu; |
| 994 | |
| 995 | if (powernow_k8_cpu_init_acpi(data)) { |
| 996 | /* |
| 997 | * Use the PSB BIOS structure. This is only availabe on |
| 998 | * an UP version, and is deprecated by AMD. |
| 999 | */ |
| 1000 | |
| 1001 | if ((num_online_cpus() != 1) || (num_possible_cpus() != 1)) { |
Dave Jones | 065b807 | 2005-05-31 19:03:46 -0700 | [diff] [blame^] | 1002 | printk(KERN_ERR PFX "MP systems not supported by PSB BIOS structure\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1003 | kfree(data); |
| 1004 | return -ENODEV; |
| 1005 | } |
| 1006 | if (pol->cpu != 0) { |
| 1007 | printk(KERN_ERR PFX "init not cpu 0\n"); |
| 1008 | kfree(data); |
| 1009 | return -ENODEV; |
| 1010 | } |
| 1011 | rc = find_psb_table(data); |
| 1012 | if (rc) { |
| 1013 | kfree(data); |
| 1014 | return -ENODEV; |
| 1015 | } |
| 1016 | } |
| 1017 | |
| 1018 | /* only run on specific CPU from here on */ |
| 1019 | oldmask = current->cpus_allowed; |
| 1020 | set_cpus_allowed(current, cpumask_of_cpu(pol->cpu)); |
| 1021 | schedule(); |
| 1022 | |
| 1023 | if (smp_processor_id() != pol->cpu) { |
| 1024 | printk(KERN_ERR "limiting to cpu %u failed\n", pol->cpu); |
| 1025 | goto err_out; |
| 1026 | } |
| 1027 | |
| 1028 | if (pending_bit_stuck()) { |
| 1029 | printk(KERN_ERR PFX "failing init, change pending bit set\n"); |
| 1030 | goto err_out; |
| 1031 | } |
| 1032 | |
| 1033 | if (query_current_values_with_pending_wait(data)) |
| 1034 | goto err_out; |
| 1035 | |
| 1036 | fidvid_msr_init(); |
| 1037 | |
| 1038 | /* run on any CPU again */ |
| 1039 | set_cpus_allowed(current, oldmask); |
| 1040 | schedule(); |
| 1041 | |
| 1042 | pol->governor = CPUFREQ_DEFAULT_GOVERNOR; |
Dave Jones | 065b807 | 2005-05-31 19:03:46 -0700 | [diff] [blame^] | 1043 | pol->cpus = cpu_core_map[pol->cpu]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1044 | |
| 1045 | /* Take a crude guess here. |
| 1046 | * That guess was in microseconds, so multiply with 1000 */ |
| 1047 | pol->cpuinfo.transition_latency = (((data->rvo + 8) * data->vstable * VST_UNITS_20US) |
| 1048 | + (3 * (1 << data->irt) * 10)) * 1000; |
| 1049 | |
| 1050 | pol->cur = find_khz_freq_from_fid(data->currfid); |
| 1051 | dprintk("policy current frequency %d kHz\n", pol->cur); |
| 1052 | |
| 1053 | /* min/max the cpu is capable of */ |
| 1054 | if (cpufreq_frequency_table_cpuinfo(pol, data->powernow_table)) { |
| 1055 | printk(KERN_ERR PFX "invalid powernow_table\n"); |
| 1056 | powernow_k8_cpu_exit_acpi(data); |
| 1057 | kfree(data->powernow_table); |
| 1058 | kfree(data); |
| 1059 | return -EINVAL; |
| 1060 | } |
| 1061 | |
| 1062 | cpufreq_frequency_table_get_attr(data->powernow_table, pol->cpu); |
| 1063 | |
| 1064 | printk("cpu_init done, current fid 0x%x, vid 0x%x\n", |
| 1065 | data->currfid, data->currvid); |
| 1066 | |
| 1067 | powernow_data[pol->cpu] = data; |
| 1068 | |
| 1069 | return 0; |
| 1070 | |
| 1071 | err_out: |
| 1072 | set_cpus_allowed(current, oldmask); |
| 1073 | schedule(); |
| 1074 | powernow_k8_cpu_exit_acpi(data); |
| 1075 | |
| 1076 | kfree(data); |
| 1077 | return -ENODEV; |
| 1078 | } |
| 1079 | |
| 1080 | static int __devexit powernowk8_cpu_exit (struct cpufreq_policy *pol) |
| 1081 | { |
| 1082 | struct powernow_k8_data *data = powernow_data[pol->cpu]; |
| 1083 | |
| 1084 | if (!data) |
| 1085 | return -EINVAL; |
| 1086 | |
| 1087 | powernow_k8_cpu_exit_acpi(data); |
| 1088 | |
| 1089 | cpufreq_frequency_table_put_attr(pol->cpu); |
| 1090 | |
| 1091 | kfree(data->powernow_table); |
| 1092 | kfree(data); |
| 1093 | |
| 1094 | return 0; |
| 1095 | } |
| 1096 | |
| 1097 | static unsigned int powernowk8_get (unsigned int cpu) |
| 1098 | { |
| 1099 | struct powernow_k8_data *data = powernow_data[cpu]; |
| 1100 | cpumask_t oldmask = current->cpus_allowed; |
| 1101 | unsigned int khz = 0; |
| 1102 | |
| 1103 | set_cpus_allowed(current, cpumask_of_cpu(cpu)); |
| 1104 | if (smp_processor_id() != cpu) { |
| 1105 | printk(KERN_ERR PFX "limiting to CPU %d failed in powernowk8_get\n", cpu); |
| 1106 | set_cpus_allowed(current, oldmask); |
| 1107 | return 0; |
| 1108 | } |
| 1109 | preempt_disable(); |
Dave Jones | 065b807 | 2005-05-31 19:03:46 -0700 | [diff] [blame^] | 1110 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1111 | if (query_current_values_with_pending_wait(data)) |
| 1112 | goto out; |
| 1113 | |
| 1114 | khz = find_khz_freq_from_fid(data->currfid); |
| 1115 | |
| 1116 | out: |
| 1117 | preempt_enable_no_resched(); |
| 1118 | set_cpus_allowed(current, oldmask); |
| 1119 | |
| 1120 | return khz; |
| 1121 | } |
| 1122 | |
| 1123 | static struct freq_attr* powernow_k8_attr[] = { |
| 1124 | &cpufreq_freq_attr_scaling_available_freqs, |
| 1125 | NULL, |
| 1126 | }; |
| 1127 | |
| 1128 | static struct cpufreq_driver cpufreq_amd64_driver = { |
| 1129 | .verify = powernowk8_verify, |
| 1130 | .target = powernowk8_target, |
| 1131 | .init = powernowk8_cpu_init, |
| 1132 | .exit = __devexit_p(powernowk8_cpu_exit), |
| 1133 | .get = powernowk8_get, |
| 1134 | .name = "powernow-k8", |
| 1135 | .owner = THIS_MODULE, |
| 1136 | .attr = powernow_k8_attr, |
| 1137 | }; |
| 1138 | |
| 1139 | /* driver entry point for init */ |
| 1140 | static int __init powernowk8_init(void) |
| 1141 | { |
| 1142 | unsigned int i, supported_cpus = 0; |
| 1143 | |
| 1144 | for (i=0; i<NR_CPUS; i++) { |
| 1145 | if (!cpu_online(i)) |
| 1146 | continue; |
| 1147 | if (check_supported_cpu(i)) |
| 1148 | supported_cpus++; |
| 1149 | } |
| 1150 | |
| 1151 | if (supported_cpus == num_online_cpus()) { |
| 1152 | printk(KERN_INFO PFX "Found %d AMD Athlon 64 / Opteron processors (" VERSION ")\n", |
| 1153 | supported_cpus); |
| 1154 | return cpufreq_register_driver(&cpufreq_amd64_driver); |
| 1155 | } |
| 1156 | |
| 1157 | return -ENODEV; |
| 1158 | } |
| 1159 | |
| 1160 | /* driver entry point for term */ |
| 1161 | static void __exit powernowk8_exit(void) |
| 1162 | { |
| 1163 | dprintk("exit\n"); |
| 1164 | |
| 1165 | cpufreq_unregister_driver(&cpufreq_amd64_driver); |
| 1166 | } |
| 1167 | |
Dave Jones | 065b807 | 2005-05-31 19:03:46 -0700 | [diff] [blame^] | 1168 | MODULE_AUTHOR("Paul Devriendt <paul.devriendt@amd.com> and Mark Langsdorf <mark.langsdorf@amd.com."); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1169 | MODULE_DESCRIPTION("AMD Athlon 64 and Opteron processor frequency driver."); |
| 1170 | MODULE_LICENSE("GPL"); |
| 1171 | |
| 1172 | late_initcall(powernowk8_init); |
| 1173 | module_exit(powernowk8_exit); |
Dave Jones | 065b807 | 2005-05-31 19:03:46 -0700 | [diff] [blame^] | 1174 | |