Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * AMD K7 Powernow driver. |
Dave Jones | f4432c5 | 2008-10-20 13:31:45 -0400 | [diff] [blame] | 3 | * (C) 2003 Dave Jones on behalf of SuSE Labs. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | * |
Dave Jones | b9e7638 | 2009-01-18 00:32:26 -0500 | [diff] [blame] | 9 | * Errata 5: |
| 10 | * CPU may fail to execute a FID/VID change in presence of interrupt. |
| 11 | * - We cli/sti on stepping A0 CPUs around the FID/VID transition. |
| 12 | * Errata 15: |
| 13 | * CPU with half frequency multipliers may hang upon wakeup from disconnect. |
| 14 | * - We disable half multipliers if ACPI is used on A0 stepping CPUs. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 15 | */ |
| 16 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 17 | #include <linux/kernel.h> |
| 18 | #include <linux/module.h> |
| 19 | #include <linux/moduleparam.h> |
| 20 | #include <linux/init.h> |
| 21 | #include <linux/cpufreq.h> |
| 22 | #include <linux/slab.h> |
| 23 | #include <linux/string.h> |
| 24 | #include <linux/dmi.h> |
Dave Jones | b9e7638 | 2009-01-18 00:32:26 -0500 | [diff] [blame] | 25 | #include <linux/timex.h> |
| 26 | #include <linux/io.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 27 | |
Dave Jones | b9e7638 | 2009-01-18 00:32:26 -0500 | [diff] [blame] | 28 | #include <asm/timer.h> /* Needed for recalibrate_cpu_khz() */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 29 | #include <asm/msr.h> |
Andi Kleen | fa8031a | 2012-01-26 00:09:12 +0100 | [diff] [blame] | 30 | #include <asm/cpu_device_id.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 31 | |
| 32 | #ifdef CONFIG_X86_POWERNOW_K7_ACPI |
| 33 | #include <linux/acpi.h> |
| 34 | #include <acpi/processor.h> |
| 35 | #endif |
| 36 | |
| 37 | #include "powernow-k7.h" |
| 38 | |
| 39 | #define PFX "powernow: " |
| 40 | |
| 41 | |
| 42 | struct psb_s { |
| 43 | u8 signature[10]; |
| 44 | u8 tableversion; |
| 45 | u8 flags; |
| 46 | u16 settlingtime; |
| 47 | u8 reserved1; |
| 48 | u8 numpst; |
| 49 | }; |
| 50 | |
| 51 | struct pst_s { |
| 52 | u32 cpuid; |
| 53 | u8 fsbspeed; |
| 54 | u8 maxfid; |
| 55 | u8 startvid; |
| 56 | u8 numpstates; |
| 57 | }; |
| 58 | |
| 59 | #ifdef CONFIG_X86_POWERNOW_K7_ACPI |
| 60 | union powernow_acpi_control_t { |
| 61 | struct { |
| 62 | unsigned long fid:5, |
Dave Jones | b9e7638 | 2009-01-18 00:32:26 -0500 | [diff] [blame] | 63 | vid:5, |
| 64 | sgtc:20, |
| 65 | res1:2; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 66 | } bits; |
| 67 | unsigned long val; |
| 68 | }; |
| 69 | #endif |
| 70 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 71 | /* divide by 1000 to get VCore voltage in V. */ |
Dave Jones | bd5ab26 | 2007-02-22 19:11:16 -0500 | [diff] [blame] | 72 | static const int mobile_vid_table[32] = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 73 | 2000, 1950, 1900, 1850, 1800, 1750, 1700, 1650, |
| 74 | 1600, 1550, 1500, 1450, 1400, 1350, 1300, 0, |
| 75 | 1275, 1250, 1225, 1200, 1175, 1150, 1125, 1100, |
| 76 | 1075, 1050, 1025, 1000, 975, 950, 925, 0, |
| 77 | }; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 78 | |
| 79 | /* divide by 10 to get FID. */ |
Dave Jones | bd5ab26 | 2007-02-22 19:11:16 -0500 | [diff] [blame] | 80 | static const int fid_codes[32] = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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; |
Dave Jones | fff78ad | 2009-01-17 22:28:42 -0500 | [diff] [blame] | 97 | static unsigned int minimum_speed = -1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 104 | static int check_fsb(unsigned int fsbspeed) |
| 105 | { |
| 106 | int delta; |
| 107 | unsigned int f = fsb / 1000; |
| 108 | |
| 109 | delta = (fsbspeed > f) ? fsbspeed - f : f - fsbspeed; |
Dave Jones | b9e7638 | 2009-01-18 00:32:26 -0500 | [diff] [blame] | 110 | return delta < 5; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 111 | } |
| 112 | |
Andi Kleen | fa8031a | 2012-01-26 00:09:12 +0100 | [diff] [blame] | 113 | static const struct x86_cpu_id powernow_k7_cpuids[] = { |
Ben Hutchings | 30bcfff | 2012-02-11 22:58:14 +0000 | [diff] [blame] | 114 | { X86_VENDOR_AMD, 6, }, |
Andi Kleen | fa8031a | 2012-01-26 00:09:12 +0100 | [diff] [blame] | 115 | {} |
| 116 | }; |
| 117 | MODULE_DEVICE_TABLE(x86cpu, powernow_k7_cpuids); |
| 118 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 119 | static int check_powernow(void) |
| 120 | { |
Mike Travis | 92cb761 | 2007-10-19 20:35:04 +0200 | [diff] [blame] | 121 | struct cpuinfo_x86 *c = &cpu_data(0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 122 | unsigned int maxei, eax, ebx, ecx, edx; |
| 123 | |
Andi Kleen | fa8031a | 2012-01-26 00:09:12 +0100 | [diff] [blame] | 124 | if (!x86_match_cpu(powernow_k7_cpuids)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 125 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 126 | |
| 127 | /* Get maximum capabilities */ |
Dave Jones | b9e7638 | 2009-01-18 00:32:26 -0500 | [diff] [blame] | 128 | maxei = cpuid_eax(0x80000000); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 129 | if (maxei < 0x80000007) { /* Any powernow info ? */ |
| 130 | #ifdef MODULE |
Dave Jones | b9e7638 | 2009-01-18 00:32:26 -0500 | [diff] [blame] | 131 | printk(KERN_INFO PFX "No powernow capabilities detected\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 132 | #endif |
| 133 | return 0; |
| 134 | } |
| 135 | |
| 136 | if ((c->x86_model == 6) && (c->x86_mask == 0)) { |
Dave Jones | b9e7638 | 2009-01-18 00:32:26 -0500 | [diff] [blame] | 137 | printk(KERN_INFO PFX "K7 660[A0] core detected, " |
| 138 | "enabling errata workarounds\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 139 | have_a0 = 1; |
| 140 | } |
| 141 | |
| 142 | cpuid(0x80000007, &eax, &ebx, &ecx, &edx); |
| 143 | |
| 144 | /* Check we can actually do something before we say anything.*/ |
| 145 | if (!(edx & (1 << 1 | 1 << 2))) |
| 146 | return 0; |
| 147 | |
Dave Jones | b9e7638 | 2009-01-18 00:32:26 -0500 | [diff] [blame] | 148 | printk(KERN_INFO PFX "PowerNOW! Technology present. Can scale: "); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 149 | |
| 150 | if (edx & 1 << 1) { |
Dave Jones | b9e7638 | 2009-01-18 00:32:26 -0500 | [diff] [blame] | 151 | printk("frequency"); |
| 152 | can_scale_bus = 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 153 | } |
| 154 | |
| 155 | if ((edx & (1 << 1 | 1 << 2)) == 0x6) |
Dave Jones | b9e7638 | 2009-01-18 00:32:26 -0500 | [diff] [blame] | 156 | printk(" and "); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 157 | |
| 158 | if (edx & 1 << 2) { |
Dave Jones | b9e7638 | 2009-01-18 00:32:26 -0500 | [diff] [blame] | 159 | printk("voltage"); |
| 160 | can_scale_vid = 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 161 | } |
| 162 | |
Dave Jones | b9e7638 | 2009-01-18 00:32:26 -0500 | [diff] [blame] | 163 | printk(".\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 164 | return 1; |
| 165 | } |
| 166 | |
Dave Jones | d38e73e | 2009-04-23 13:36:12 -0400 | [diff] [blame] | 167 | #ifdef CONFIG_X86_POWERNOW_K7_ACPI |
Dave Jones | b9e7638 | 2009-01-18 00:32:26 -0500 | [diff] [blame] | 168 | static void invalidate_entry(unsigned int entry) |
| 169 | { |
| 170 | powernow_table[entry].frequency = CPUFREQ_ENTRY_INVALID; |
| 171 | } |
Dave Jones | d38e73e | 2009-04-23 13:36:12 -0400 | [diff] [blame] | 172 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 173 | |
Dave Jones | b9e7638 | 2009-01-18 00:32:26 -0500 | [diff] [blame] | 174 | static int get_ranges(unsigned char *pst) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 175 | { |
| 176 | unsigned int j; |
| 177 | unsigned int speed; |
| 178 | u8 fid, vid; |
| 179 | |
Dave Jones | b9e7638 | 2009-01-18 00:32:26 -0500 | [diff] [blame] | 180 | powernow_table = kzalloc((sizeof(struct cpufreq_frequency_table) * |
| 181 | (number_scales + 1)), GFP_KERNEL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 182 | if (!powernow_table) |
| 183 | return -ENOMEM; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 184 | |
Dave Jones | b9e7638 | 2009-01-18 00:32:26 -0500 | [diff] [blame] | 185 | for (j = 0 ; j < number_scales; j++) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 186 | fid = *pst++; |
| 187 | |
| 188 | powernow_table[j].frequency = (fsb * fid_codes[fid]) / 10; |
Viresh Kumar | 5070158 | 2013-03-30 16:25:15 +0530 | [diff] [blame] | 189 | powernow_table[j].driver_data = fid; /* lower 8 bits */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 190 | |
| 191 | speed = powernow_table[j].frequency; |
| 192 | |
Dave Jones | b9e7638 | 2009-01-18 00:32:26 -0500 | [diff] [blame] | 193 | if ((fid_codes[fid] % 10) == 5) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 194 | #ifdef CONFIG_X86_POWERNOW_K7_ACPI |
| 195 | if (have_a0 == 1) |
Dave Jones | b9e7638 | 2009-01-18 00:32:26 -0500 | [diff] [blame] | 196 | invalidate_entry(j); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 197 | #endif |
| 198 | } |
| 199 | |
| 200 | if (speed < minimum_speed) |
| 201 | minimum_speed = speed; |
| 202 | if (speed > maximum_speed) |
| 203 | maximum_speed = speed; |
| 204 | |
| 205 | vid = *pst++; |
Viresh Kumar | 5070158 | 2013-03-30 16:25:15 +0530 | [diff] [blame] | 206 | powernow_table[j].driver_data |= (vid << 8); /* upper 8 bits */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 207 | |
Dominik Brodowski | 2d06d8c | 2011-03-27 15:04:46 +0200 | [diff] [blame] | 208 | pr_debug(" FID: 0x%x (%d.%dx [%dMHz]) " |
Dave Jones | 32ee8c3 | 2006-02-28 00:43:23 -0500 | [diff] [blame] | 209 | "VID: 0x%x (%d.%03dV)\n", fid, fid_codes[fid] / 10, |
| 210 | fid_codes[fid] % 10, speed/1000, vid, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 211 | mobile_vid_table[vid]/1000, |
| 212 | mobile_vid_table[vid]%1000); |
| 213 | } |
| 214 | powernow_table[number_scales].frequency = CPUFREQ_TABLE_END; |
Viresh Kumar | 5070158 | 2013-03-30 16:25:15 +0530 | [diff] [blame] | 215 | powernow_table[number_scales].driver_data = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 216 | |
| 217 | return 0; |
| 218 | } |
| 219 | |
| 220 | |
| 221 | static void change_FID(int fid) |
| 222 | { |
| 223 | union msr_fidvidctl fidvidctl; |
| 224 | |
Dave Jones | b9e7638 | 2009-01-18 00:32:26 -0500 | [diff] [blame] | 225 | rdmsrl(MSR_K7_FID_VID_CTL, fidvidctl.val); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 226 | if (fidvidctl.bits.FID != fid) { |
| 227 | fidvidctl.bits.SGTC = latency; |
| 228 | fidvidctl.bits.FID = fid; |
| 229 | fidvidctl.bits.VIDC = 0; |
| 230 | fidvidctl.bits.FIDC = 1; |
Dave Jones | b9e7638 | 2009-01-18 00:32:26 -0500 | [diff] [blame] | 231 | wrmsrl(MSR_K7_FID_VID_CTL, fidvidctl.val); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 232 | } |
| 233 | } |
| 234 | |
| 235 | |
| 236 | static void change_VID(int vid) |
| 237 | { |
| 238 | union msr_fidvidctl fidvidctl; |
| 239 | |
Dave Jones | b9e7638 | 2009-01-18 00:32:26 -0500 | [diff] [blame] | 240 | rdmsrl(MSR_K7_FID_VID_CTL, fidvidctl.val); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 241 | if (fidvidctl.bits.VID != vid) { |
| 242 | fidvidctl.bits.SGTC = latency; |
| 243 | fidvidctl.bits.VID = vid; |
| 244 | fidvidctl.bits.FIDC = 0; |
| 245 | fidvidctl.bits.VIDC = 1; |
Dave Jones | b9e7638 | 2009-01-18 00:32:26 -0500 | [diff] [blame] | 246 | wrmsrl(MSR_K7_FID_VID_CTL, fidvidctl.val); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 247 | } |
| 248 | } |
| 249 | |
| 250 | |
Viresh Kumar | b43a7ff | 2013-03-24 11:56:43 +0530 | [diff] [blame] | 251 | static void change_speed(struct cpufreq_policy *policy, unsigned int index) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 252 | { |
| 253 | u8 fid, vid; |
| 254 | struct cpufreq_freqs freqs; |
| 255 | union msr_fidvidstatus fidvidstatus; |
| 256 | int cfid; |
| 257 | |
| 258 | /* fid are the lower 8 bits of the index we stored into |
| 259 | * the cpufreq frequency table in powernow_decode_bios, |
| 260 | * vid are the upper 8 bits. |
| 261 | */ |
| 262 | |
Viresh Kumar | 5070158 | 2013-03-30 16:25:15 +0530 | [diff] [blame] | 263 | fid = powernow_table[index].driver_data & 0xFF; |
| 264 | vid = (powernow_table[index].driver_data & 0xFF00) >> 8; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 265 | |
Dave Jones | b9e7638 | 2009-01-18 00:32:26 -0500 | [diff] [blame] | 266 | rdmsrl(MSR_K7_FID_VID_STATUS, fidvidstatus.val); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 267 | cfid = fidvidstatus.bits.CFID; |
| 268 | freqs.old = fsb * fid_codes[cfid] / 10; |
| 269 | |
| 270 | freqs.new = powernow_table[index].frequency; |
| 271 | |
Viresh Kumar | b43a7ff | 2013-03-24 11:56:43 +0530 | [diff] [blame] | 272 | cpufreq_notify_transition(policy, &freqs, CPUFREQ_PRECHANGE); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 273 | |
| 274 | /* Now do the magic poking into the MSRs. */ |
| 275 | |
| 276 | if (have_a0 == 1) /* A0 errata 5 */ |
| 277 | local_irq_disable(); |
| 278 | |
| 279 | if (freqs.old > freqs.new) { |
| 280 | /* Going down, so change FID first */ |
| 281 | change_FID(fid); |
| 282 | change_VID(vid); |
| 283 | } else { |
| 284 | /* Going up, so change VID first */ |
| 285 | change_VID(vid); |
| 286 | change_FID(fid); |
| 287 | } |
| 288 | |
| 289 | |
| 290 | if (have_a0 == 1) |
| 291 | local_irq_enable(); |
| 292 | |
Viresh Kumar | b43a7ff | 2013-03-24 11:56:43 +0530 | [diff] [blame] | 293 | cpufreq_notify_transition(policy, &freqs, CPUFREQ_POSTCHANGE); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 294 | } |
| 295 | |
| 296 | |
| 297 | #ifdef CONFIG_X86_POWERNOW_K7_ACPI |
| 298 | |
| 299 | static struct acpi_processor_performance *acpi_processor_perf; |
| 300 | |
| 301 | static int powernow_acpi_init(void) |
| 302 | { |
| 303 | int i; |
| 304 | int retval = 0; |
| 305 | union powernow_acpi_control_t pc; |
| 306 | |
| 307 | if (acpi_processor_perf != NULL && powernow_table != NULL) { |
| 308 | retval = -EINVAL; |
| 309 | goto err0; |
| 310 | } |
| 311 | |
Dave Jones | bfdc708 | 2005-10-20 15:16:15 -0700 | [diff] [blame] | 312 | acpi_processor_perf = kzalloc(sizeof(struct acpi_processor_performance), |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 313 | GFP_KERNEL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 314 | if (!acpi_processor_perf) { |
| 315 | retval = -ENOMEM; |
| 316 | goto err0; |
| 317 | } |
| 318 | |
Yinghai Lu | eaa9584 | 2009-06-06 14:51:36 -0700 | [diff] [blame] | 319 | if (!zalloc_cpumask_var(&acpi_processor_perf->shared_cpu_map, |
Rusty Russell | 2fdf66b | 2008-12-31 18:08:47 -0800 | [diff] [blame] | 320 | GFP_KERNEL)) { |
| 321 | retval = -ENOMEM; |
| 322 | goto err05; |
| 323 | } |
| 324 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 325 | if (acpi_processor_register_performance(acpi_processor_perf, 0)) { |
| 326 | retval = -EIO; |
| 327 | goto err1; |
| 328 | } |
| 329 | |
Dave Jones | b9e7638 | 2009-01-18 00:32:26 -0500 | [diff] [blame] | 330 | if (acpi_processor_perf->control_register.space_id != |
| 331 | ACPI_ADR_SPACE_FIXED_HARDWARE) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 332 | retval = -ENODEV; |
| 333 | goto err2; |
| 334 | } |
| 335 | |
Dave Jones | b9e7638 | 2009-01-18 00:32:26 -0500 | [diff] [blame] | 336 | if (acpi_processor_perf->status_register.space_id != |
| 337 | ACPI_ADR_SPACE_FIXED_HARDWARE) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 338 | retval = -ENODEV; |
| 339 | goto err2; |
| 340 | } |
| 341 | |
| 342 | number_scales = acpi_processor_perf->state_count; |
| 343 | |
| 344 | if (number_scales < 2) { |
| 345 | retval = -ENODEV; |
| 346 | goto err2; |
| 347 | } |
| 348 | |
Dave Jones | b9e7638 | 2009-01-18 00:32:26 -0500 | [diff] [blame] | 349 | powernow_table = kzalloc((sizeof(struct cpufreq_frequency_table) * |
| 350 | (number_scales + 1)), GFP_KERNEL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 351 | if (!powernow_table) { |
| 352 | retval = -ENOMEM; |
| 353 | goto err2; |
| 354 | } |
| 355 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 356 | pc.val = (unsigned long) acpi_processor_perf->states[0].control; |
| 357 | for (i = 0; i < number_scales; i++) { |
| 358 | u8 fid, vid; |
Daniel Drake | dc2585e | 2007-05-02 23:19:05 +0100 | [diff] [blame] | 359 | struct acpi_processor_px *state = |
| 360 | &acpi_processor_perf->states[i]; |
| 361 | unsigned int speed, speed_mhz; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 362 | |
Daniel Drake | dc2585e | 2007-05-02 23:19:05 +0100 | [diff] [blame] | 363 | pc.val = (unsigned long) state->control; |
Dominik Brodowski | 2d06d8c | 2011-03-27 15:04:46 +0200 | [diff] [blame] | 364 | pr_debug("acpi: P%d: %d MHz %d mW %d uS control %08x SGTC %d\n", |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 365 | i, |
Daniel Drake | dc2585e | 2007-05-02 23:19:05 +0100 | [diff] [blame] | 366 | (u32) state->core_frequency, |
| 367 | (u32) state->power, |
| 368 | (u32) state->transition_latency, |
| 369 | (u32) state->control, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 370 | pc.bits.sgtc); |
| 371 | |
| 372 | vid = pc.bits.vid; |
| 373 | fid = pc.bits.fid; |
| 374 | |
| 375 | powernow_table[i].frequency = fsb * fid_codes[fid] / 10; |
Viresh Kumar | 5070158 | 2013-03-30 16:25:15 +0530 | [diff] [blame] | 376 | powernow_table[i].driver_data = fid; /* lower 8 bits */ |
| 377 | powernow_table[i].driver_data |= (vid << 8); /* upper 8 bits */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 378 | |
| 379 | speed = powernow_table[i].frequency; |
Daniel Drake | dc2585e | 2007-05-02 23:19:05 +0100 | [diff] [blame] | 380 | speed_mhz = speed / 1000; |
| 381 | |
| 382 | /* processor_perflib will multiply the MHz value by 1000 to |
| 383 | * get a KHz value (e.g. 1266000). However, powernow-k7 works |
| 384 | * with true KHz values (e.g. 1266768). To ensure that all |
| 385 | * powernow frequencies are available, we must ensure that |
| 386 | * ACPI doesn't restrict them, so we round up the MHz value |
| 387 | * to ensure that perflib's computed KHz value is greater than |
| 388 | * or equal to powernow's KHz value. |
| 389 | */ |
| 390 | if (speed % 1000 > 0) |
| 391 | speed_mhz++; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 392 | |
Dave Jones | b9e7638 | 2009-01-18 00:32:26 -0500 | [diff] [blame] | 393 | if ((fid_codes[fid] % 10) == 5) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 394 | if (have_a0 == 1) |
Dave Jones | b9e7638 | 2009-01-18 00:32:26 -0500 | [diff] [blame] | 395 | invalidate_entry(i); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 396 | } |
| 397 | |
Dominik Brodowski | 2d06d8c | 2011-03-27 15:04:46 +0200 | [diff] [blame] | 398 | pr_debug(" FID: 0x%x (%d.%dx [%dMHz]) " |
Dave Jones | 32ee8c3 | 2006-02-28 00:43:23 -0500 | [diff] [blame] | 399 | "VID: 0x%x (%d.%03dV)\n", fid, fid_codes[fid] / 10, |
Daniel Drake | dc2585e | 2007-05-02 23:19:05 +0100 | [diff] [blame] | 400 | fid_codes[fid] % 10, speed_mhz, vid, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 401 | mobile_vid_table[vid]/1000, |
| 402 | mobile_vid_table[vid]%1000); |
| 403 | |
Daniel Drake | dc2585e | 2007-05-02 23:19:05 +0100 | [diff] [blame] | 404 | if (state->core_frequency != speed_mhz) { |
| 405 | state->core_frequency = speed_mhz; |
Dominik Brodowski | 2d06d8c | 2011-03-27 15:04:46 +0200 | [diff] [blame] | 406 | pr_debug(" Corrected ACPI frequency to %d\n", |
Daniel Drake | dc2585e | 2007-05-02 23:19:05 +0100 | [diff] [blame] | 407 | speed_mhz); |
| 408 | } |
| 409 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 410 | if (latency < pc.bits.sgtc) |
| 411 | latency = pc.bits.sgtc; |
| 412 | |
| 413 | if (speed < minimum_speed) |
| 414 | minimum_speed = speed; |
| 415 | if (speed > maximum_speed) |
| 416 | maximum_speed = speed; |
| 417 | } |
| 418 | |
| 419 | powernow_table[i].frequency = CPUFREQ_TABLE_END; |
Viresh Kumar | 5070158 | 2013-03-30 16:25:15 +0530 | [diff] [blame] | 420 | powernow_table[i].driver_data = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 421 | |
| 422 | /* notify BIOS that we exist */ |
| 423 | acpi_processor_notify_smm(THIS_MODULE); |
| 424 | |
| 425 | return 0; |
| 426 | |
| 427 | err2: |
| 428 | acpi_processor_unregister_performance(acpi_processor_perf, 0); |
| 429 | err1: |
Rusty Russell | 2fdf66b | 2008-12-31 18:08:47 -0800 | [diff] [blame] | 430 | free_cpumask_var(acpi_processor_perf->shared_cpu_map); |
| 431 | err05: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 432 | kfree(acpi_processor_perf); |
| 433 | err0: |
Dave Jones | b9e7638 | 2009-01-18 00:32:26 -0500 | [diff] [blame] | 434 | printk(KERN_WARNING PFX "ACPI perflib can not be used on " |
| 435 | "this platform\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 436 | acpi_processor_perf = NULL; |
| 437 | return retval; |
| 438 | } |
| 439 | #else |
| 440 | static int powernow_acpi_init(void) |
| 441 | { |
| 442 | printk(KERN_INFO PFX "no support for ACPI processor found." |
| 443 | " Please recompile your kernel with ACPI processor\n"); |
| 444 | return -EINVAL; |
| 445 | } |
| 446 | #endif |
| 447 | |
Dave Jones | b9e7638 | 2009-01-18 00:32:26 -0500 | [diff] [blame] | 448 | static void print_pst_entry(struct pst_s *pst, unsigned int j) |
| 449 | { |
Dominik Brodowski | 2d06d8c | 2011-03-27 15:04:46 +0200 | [diff] [blame] | 450 | pr_debug("PST:%d (@%p)\n", j, pst); |
| 451 | pr_debug(" cpuid: 0x%x fsb: %d maxFID: 0x%x startvid: 0x%x\n", |
Dave Jones | b9e7638 | 2009-01-18 00:32:26 -0500 | [diff] [blame] | 452 | pst->cpuid, pst->fsbspeed, pst->maxfid, pst->startvid); |
| 453 | } |
| 454 | |
| 455 | static int powernow_decode_bios(int maxfid, int startvid) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 456 | { |
| 457 | struct psb_s *psb; |
| 458 | struct pst_s *pst; |
| 459 | unsigned int i, j; |
| 460 | unsigned char *p; |
| 461 | unsigned int etuple; |
| 462 | unsigned int ret; |
| 463 | |
| 464 | etuple = cpuid_eax(0x80000001); |
| 465 | |
Dave Jones | b9e7638 | 2009-01-18 00:32:26 -0500 | [diff] [blame] | 466 | for (i = 0xC0000; i < 0xffff0 ; i += 16) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 467 | |
| 468 | p = phys_to_virt(i); |
| 469 | |
Dave Jones | b9e7638 | 2009-01-18 00:32:26 -0500 | [diff] [blame] | 470 | if (memcmp(p, "AMDK7PNOW!", 10) == 0) { |
Dominik Brodowski | 2d06d8c | 2011-03-27 15:04:46 +0200 | [diff] [blame] | 471 | pr_debug("Found PSB header at %p\n", p); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 472 | psb = (struct psb_s *) p; |
Dominik Brodowski | 2d06d8c | 2011-03-27 15:04:46 +0200 | [diff] [blame] | 473 | pr_debug("Table version: 0x%x\n", psb->tableversion); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 474 | if (psb->tableversion != 0x12) { |
Dave Jones | b9e7638 | 2009-01-18 00:32:26 -0500 | [diff] [blame] | 475 | printk(KERN_INFO PFX "Sorry, only v1.2 tables" |
| 476 | " supported right now\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 477 | return -ENODEV; |
| 478 | } |
| 479 | |
Dominik Brodowski | 2d06d8c | 2011-03-27 15:04:46 +0200 | [diff] [blame] | 480 | pr_debug("Flags: 0x%x\n", psb->flags); |
Dave Jones | b9e7638 | 2009-01-18 00:32:26 -0500 | [diff] [blame] | 481 | if ((psb->flags & 1) == 0) |
Dominik Brodowski | 2d06d8c | 2011-03-27 15:04:46 +0200 | [diff] [blame] | 482 | pr_debug("Mobile voltage regulator\n"); |
Dave Jones | b9e7638 | 2009-01-18 00:32:26 -0500 | [diff] [blame] | 483 | else |
Dominik Brodowski | 2d06d8c | 2011-03-27 15:04:46 +0200 | [diff] [blame] | 484 | pr_debug("Desktop voltage regulator\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 485 | |
| 486 | latency = psb->settlingtime; |
| 487 | if (latency < 100) { |
Dave Jones | b9e7638 | 2009-01-18 00:32:26 -0500 | [diff] [blame] | 488 | printk(KERN_INFO PFX "BIOS set settling time " |
| 489 | "to %d microseconds. " |
| 490 | "Should be at least 100. " |
| 491 | "Correcting.\n", latency); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 492 | latency = 100; |
| 493 | } |
Dominik Brodowski | 2d06d8c | 2011-03-27 15:04:46 +0200 | [diff] [blame] | 494 | pr_debug("Settling Time: %d microseconds.\n", |
Dave Jones | b9e7638 | 2009-01-18 00:32:26 -0500 | [diff] [blame] | 495 | psb->settlingtime); |
Dominik Brodowski | 2d06d8c | 2011-03-27 15:04:46 +0200 | [diff] [blame] | 496 | pr_debug("Has %d PST tables. (Only dumping ones " |
Dave Jones | b9e7638 | 2009-01-18 00:32:26 -0500 | [diff] [blame] | 497 | "relevant to this CPU).\n", |
| 498 | psb->numpst); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 499 | |
Dave Jones | b9e7638 | 2009-01-18 00:32:26 -0500 | [diff] [blame] | 500 | p += sizeof(struct psb_s); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 501 | |
| 502 | pst = (struct pst_s *) p; |
| 503 | |
Dave Jones | b9e7638 | 2009-01-18 00:32:26 -0500 | [diff] [blame] | 504 | for (j = 0; j < psb->numpst; j++) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 505 | pst = (struct pst_s *) p; |
| 506 | number_scales = pst->numpstates; |
| 507 | |
Dave Jones | b9e7638 | 2009-01-18 00:32:26 -0500 | [diff] [blame] | 508 | if ((etuple == pst->cpuid) && |
| 509 | check_fsb(pst->fsbspeed) && |
| 510 | (maxfid == pst->maxfid) && |
| 511 | (startvid == pst->startvid)) { |
| 512 | print_pst_entry(pst, j); |
| 513 | p = (char *)pst + sizeof(struct pst_s); |
| 514 | ret = get_ranges(p); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 515 | return ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 516 | } else { |
Dave Jones | 8cbe016 | 2006-05-30 17:26:08 -0400 | [diff] [blame] | 517 | unsigned int k; |
Dave Jones | b9e7638 | 2009-01-18 00:32:26 -0500 | [diff] [blame] | 518 | p = (char *)pst + sizeof(struct pst_s); |
| 519 | for (k = 0; k < number_scales; k++) |
| 520 | p += 2; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 521 | } |
| 522 | } |
Dave Jones | b9e7638 | 2009-01-18 00:32:26 -0500 | [diff] [blame] | 523 | printk(KERN_INFO PFX "No PST tables match this cpuid " |
| 524 | "(0x%x)\n", etuple); |
| 525 | printk(KERN_INFO PFX "This is indicative of a broken " |
| 526 | "BIOS.\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 527 | |
| 528 | return -EINVAL; |
| 529 | } |
| 530 | p++; |
| 531 | } |
| 532 | |
| 533 | return -ENODEV; |
| 534 | } |
| 535 | |
| 536 | |
Dave Jones | b9e7638 | 2009-01-18 00:32:26 -0500 | [diff] [blame] | 537 | static int powernow_target(struct cpufreq_policy *policy, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 538 | unsigned int target_freq, |
| 539 | unsigned int relation) |
| 540 | { |
| 541 | unsigned int newstate; |
| 542 | |
Dave Jones | b9e7638 | 2009-01-18 00:32:26 -0500 | [diff] [blame] | 543 | if (cpufreq_frequency_table_target(policy, powernow_table, target_freq, |
| 544 | relation, &newstate)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 545 | return -EINVAL; |
| 546 | |
Viresh Kumar | b43a7ff | 2013-03-24 11:56:43 +0530 | [diff] [blame] | 547 | change_speed(policy, newstate); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 548 | |
| 549 | return 0; |
| 550 | } |
| 551 | |
| 552 | |
Dave Jones | b9e7638 | 2009-01-18 00:32:26 -0500 | [diff] [blame] | 553 | static int powernow_verify(struct cpufreq_policy *policy) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 554 | { |
| 555 | return cpufreq_frequency_table_verify(policy, powernow_table); |
| 556 | } |
| 557 | |
| 558 | /* |
| 559 | * We use the fact that the bus frequency is somehow |
| 560 | * a multiple of 100000/3 khz, then we compute sgtc according |
| 561 | * to this multiple. |
| 562 | * That way, we match more how AMD thinks all of that work. |
| 563 | * We will then get the same kind of behaviour already tested under |
| 564 | * the "well-known" other OS. |
| 565 | */ |
Holger Freyther | 307069c | 2010-07-19 03:29:16 +0800 | [diff] [blame] | 566 | static int __cpuinit fixup_sgtc(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 567 | { |
| 568 | unsigned int sgtc; |
| 569 | unsigned int m; |
| 570 | |
| 571 | m = fsb / 3333; |
| 572 | if ((m % 10) >= 5) |
| 573 | m += 5; |
| 574 | |
| 575 | m /= 10; |
| 576 | |
| 577 | sgtc = 100 * m * latency; |
| 578 | sgtc = sgtc / 3; |
| 579 | if (sgtc > 0xfffff) { |
| 580 | printk(KERN_WARNING PFX "SGTC too large %d\n", sgtc); |
| 581 | sgtc = 0xfffff; |
| 582 | } |
| 583 | return sgtc; |
| 584 | } |
| 585 | |
| 586 | static unsigned int powernow_get(unsigned int cpu) |
| 587 | { |
| 588 | union msr_fidvidstatus fidvidstatus; |
| 589 | unsigned int cfid; |
| 590 | |
| 591 | if (cpu) |
| 592 | return 0; |
Dave Jones | b9e7638 | 2009-01-18 00:32:26 -0500 | [diff] [blame] | 593 | rdmsrl(MSR_K7_FID_VID_STATUS, fidvidstatus.val); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 594 | cfid = fidvidstatus.bits.CFID; |
| 595 | |
Dave Jones | b9e7638 | 2009-01-18 00:32:26 -0500 | [diff] [blame] | 596 | return fsb * fid_codes[cfid] / 10; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 597 | } |
| 598 | |
| 599 | |
Holger Freyther | 307069c | 2010-07-19 03:29:16 +0800 | [diff] [blame] | 600 | static int __cpuinit acer_cpufreq_pst(const struct dmi_system_id *d) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 601 | { |
Dave Jones | b9e7638 | 2009-01-18 00:32:26 -0500 | [diff] [blame] | 602 | printk(KERN_WARNING PFX |
| 603 | "%s laptop with broken PST tables in BIOS detected.\n", |
| 604 | d->ident); |
| 605 | printk(KERN_WARNING PFX |
| 606 | "You need to downgrade to 3A21 (09/09/2002), or try a newer " |
| 607 | "BIOS than 3A71 (01/20/2003)\n"); |
| 608 | printk(KERN_WARNING PFX |
| 609 | "cpufreq scaling has been disabled as a result of this.\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 610 | return 0; |
| 611 | } |
| 612 | |
| 613 | /* |
| 614 | * Some Athlon laptops have really fucked PST tables. |
| 615 | * A BIOS update is all that can save them. |
| 616 | * Mention this, and disable cpufreq. |
| 617 | */ |
Holger Freyther | 307069c | 2010-07-19 03:29:16 +0800 | [diff] [blame] | 618 | static struct dmi_system_id __cpuinitdata powernow_dmi_table[] = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 619 | { |
| 620 | .callback = acer_cpufreq_pst, |
| 621 | .ident = "Acer Aspire", |
| 622 | .matches = { |
| 623 | DMI_MATCH(DMI_SYS_VENDOR, "Insyde Software"), |
| 624 | DMI_MATCH(DMI_BIOS_VERSION, "3A71"), |
| 625 | }, |
| 626 | }, |
| 627 | { } |
| 628 | }; |
| 629 | |
Holger Freyther | 307069c | 2010-07-19 03:29:16 +0800 | [diff] [blame] | 630 | static int __cpuinit powernow_cpu_init(struct cpufreq_policy *policy) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 631 | { |
| 632 | union msr_fidvidstatus fidvidstatus; |
| 633 | int result; |
| 634 | |
| 635 | if (policy->cpu != 0) |
| 636 | return -ENODEV; |
| 637 | |
Dave Jones | b9e7638 | 2009-01-18 00:32:26 -0500 | [diff] [blame] | 638 | rdmsrl(MSR_K7_FID_VID_STATUS, fidvidstatus.val); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 639 | |
Dave Jones | 436fe7b | 2006-06-05 14:03:50 -0400 | [diff] [blame] | 640 | recalibrate_cpu_khz(); |
Dave Jones | 91350ed | 2005-05-31 19:03:45 -0700 | [diff] [blame] | 641 | |
| 642 | fsb = (10 * cpu_khz) / fid_codes[fidvidstatus.bits.CFID]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 643 | if (!fsb) { |
| 644 | printk(KERN_WARNING PFX "can not determine bus frequency\n"); |
| 645 | return -EINVAL; |
| 646 | } |
Dominik Brodowski | 2d06d8c | 2011-03-27 15:04:46 +0200 | [diff] [blame] | 647 | pr_debug("FSB: %3dMHz\n", fsb/1000); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 648 | |
| 649 | if (dmi_check_system(powernow_dmi_table) || acpi_force) { |
Dave Jones | b9e7638 | 2009-01-18 00:32:26 -0500 | [diff] [blame] | 650 | printk(KERN_INFO PFX "PSB/PST known to be broken. " |
| 651 | "Trying ACPI instead\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 652 | result = powernow_acpi_init(); |
| 653 | } else { |
Dave Jones | b9e7638 | 2009-01-18 00:32:26 -0500 | [diff] [blame] | 654 | result = powernow_decode_bios(fidvidstatus.bits.MFID, |
| 655 | fidvidstatus.bits.SVID); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 656 | if (result) { |
Dave Jones | b9e7638 | 2009-01-18 00:32:26 -0500 | [diff] [blame] | 657 | printk(KERN_INFO PFX "Trying ACPI perflib\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 658 | maximum_speed = 0; |
| 659 | minimum_speed = -1; |
| 660 | latency = 0; |
| 661 | result = powernow_acpi_init(); |
| 662 | if (result) { |
Dave Jones | b9e7638 | 2009-01-18 00:32:26 -0500 | [diff] [blame] | 663 | printk(KERN_INFO PFX |
| 664 | "ACPI and legacy methods failed\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 665 | } |
| 666 | } else { |
| 667 | /* SGTC use the bus clock as timer */ |
| 668 | latency = fixup_sgtc(); |
| 669 | printk(KERN_INFO PFX "SGTC: %d\n", latency); |
| 670 | } |
| 671 | } |
| 672 | |
| 673 | if (result) |
| 674 | return result; |
| 675 | |
Dave Jones | b9e7638 | 2009-01-18 00:32:26 -0500 | [diff] [blame] | 676 | printk(KERN_INFO PFX "Minimum speed %d MHz. Maximum speed %d MHz.\n", |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 677 | minimum_speed/1000, maximum_speed/1000); |
| 678 | |
Dave Jones | b9e7638 | 2009-01-18 00:32:26 -0500 | [diff] [blame] | 679 | policy->cpuinfo.transition_latency = |
| 680 | cpufreq_scale(2000000UL, fsb, latency); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 681 | |
| 682 | policy->cur = powernow_get(0); |
| 683 | |
| 684 | cpufreq_frequency_table_get_attr(powernow_table, policy->cpu); |
| 685 | |
| 686 | return cpufreq_frequency_table_cpuinfo(policy, powernow_table); |
| 687 | } |
| 688 | |
Dave Jones | b9e7638 | 2009-01-18 00:32:26 -0500 | [diff] [blame] | 689 | static int powernow_cpu_exit(struct cpufreq_policy *policy) |
| 690 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 691 | cpufreq_frequency_table_put_attr(policy->cpu); |
| 692 | |
| 693 | #ifdef CONFIG_X86_POWERNOW_K7_ACPI |
| 694 | if (acpi_processor_perf) { |
| 695 | acpi_processor_unregister_performance(acpi_processor_perf, 0); |
Rusty Russell | 2fdf66b | 2008-12-31 18:08:47 -0800 | [diff] [blame] | 696 | free_cpumask_var(acpi_processor_perf->shared_cpu_map); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 697 | kfree(acpi_processor_perf); |
| 698 | } |
| 699 | #endif |
| 700 | |
Jesper Juhl | 4ae6673 | 2005-06-25 14:58:48 -0700 | [diff] [blame] | 701 | kfree(powernow_table); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 702 | return 0; |
| 703 | } |
| 704 | |
Dave Jones | b9e7638 | 2009-01-18 00:32:26 -0500 | [diff] [blame] | 705 | static struct freq_attr *powernow_table_attr[] = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 706 | &cpufreq_freq_attr_scaling_available_freqs, |
| 707 | NULL, |
| 708 | }; |
| 709 | |
Linus Torvalds | 221dee2 | 2007-02-26 14:55:48 -0800 | [diff] [blame] | 710 | static struct cpufreq_driver powernow_driver = { |
Thomas Renninger | e2f74f3 | 2009-11-19 12:31:01 +0100 | [diff] [blame] | 711 | .verify = powernow_verify, |
| 712 | .target = powernow_target, |
| 713 | .get = powernow_get, |
| 714 | #ifdef CONFIG_X86_POWERNOW_K7_ACPI |
| 715 | .bios_limit = acpi_processor_get_bios_limit, |
| 716 | #endif |
| 717 | .init = powernow_cpu_init, |
| 718 | .exit = powernow_cpu_exit, |
| 719 | .name = "powernow-k7", |
| 720 | .owner = THIS_MODULE, |
| 721 | .attr = powernow_table_attr, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 722 | }; |
| 723 | |
Dave Jones | b9e7638 | 2009-01-18 00:32:26 -0500 | [diff] [blame] | 724 | static int __init powernow_init(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 725 | { |
Dave Jones | b9e7638 | 2009-01-18 00:32:26 -0500 | [diff] [blame] | 726 | if (check_powernow() == 0) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 727 | return -ENODEV; |
| 728 | return cpufreq_register_driver(&powernow_driver); |
| 729 | } |
| 730 | |
| 731 | |
Dave Jones | b9e7638 | 2009-01-18 00:32:26 -0500 | [diff] [blame] | 732 | static void __exit powernow_exit(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 733 | { |
| 734 | cpufreq_unregister_driver(&powernow_driver); |
| 735 | } |
| 736 | |
| 737 | module_param(acpi_force, int, 0444); |
| 738 | MODULE_PARM_DESC(acpi_force, "Force ACPI to be used."); |
| 739 | |
Dave Jones | b9e7638 | 2009-01-18 00:32:26 -0500 | [diff] [blame] | 740 | MODULE_AUTHOR("Dave Jones <davej@redhat.com>"); |
| 741 | MODULE_DESCRIPTION("Powernow driver for AMD K7 processors."); |
| 742 | MODULE_LICENSE("GPL"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 743 | |
| 744 | late_initcall(powernow_init); |
| 745 | module_exit(powernow_exit); |
| 746 | |