Thomas Gleixner | 4f19048 | 2019-05-27 08:55:14 +0200 | [diff] [blame] | 1 | // SPDX-License-Identifier: GPL-2.0-only |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2 | /* |
| 3 | * AMD K7 Powernow driver. |
Dave Jones | f4432c5 | 2008-10-20 13:31:45 -0400 | [diff] [blame] | 4 | * (C) 2003 Dave Jones on behalf of SuSE Labs. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5 | * |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 6 | * Based upon datasheets & sample CPUs kindly provided by AMD. |
| 7 | * |
Dave Jones | b9e7638 | 2009-01-18 00:32:26 -0500 | [diff] [blame] | 8 | * Errata 5: |
| 9 | * CPU may fail to execute a FID/VID change in presence of interrupt. |
| 10 | * - We cli/sti on stepping A0 CPUs around the FID/VID transition. |
| 11 | * Errata 15: |
| 12 | * CPU with half frequency multipliers may hang upon wakeup from disconnect. |
| 13 | * - We disable half multipliers if ACPI is used on A0 stepping CPUs. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 14 | */ |
| 15 | |
Joe Perches | 1c5864e | 2016-04-05 13:28:25 -0700 | [diff] [blame] | 16 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
| 17 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 18 | #include <linux/kernel.h> |
| 19 | #include <linux/module.h> |
| 20 | #include <linux/moduleparam.h> |
| 21 | #include <linux/init.h> |
| 22 | #include <linux/cpufreq.h> |
| 23 | #include <linux/slab.h> |
| 24 | #include <linux/string.h> |
| 25 | #include <linux/dmi.h> |
Dave Jones | b9e7638 | 2009-01-18 00:32:26 -0500 | [diff] [blame] | 26 | #include <linux/timex.h> |
| 27 | #include <linux/io.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 28 | |
Dave Jones | b9e7638 | 2009-01-18 00:32:26 -0500 | [diff] [blame] | 29 | #include <asm/timer.h> /* Needed for recalibrate_cpu_khz() */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 30 | #include <asm/msr.h> |
Andi Kleen | fa8031a | 2012-01-26 00:09:12 +0100 | [diff] [blame] | 31 | #include <asm/cpu_device_id.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 32 | |
| 33 | #ifdef CONFIG_X86_POWERNOW_K7_ACPI |
| 34 | #include <linux/acpi.h> |
| 35 | #include <acpi/processor.h> |
| 36 | #endif |
| 37 | |
| 38 | #include "powernow-k7.h" |
| 39 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 40 | struct psb_s { |
| 41 | u8 signature[10]; |
| 42 | u8 tableversion; |
| 43 | u8 flags; |
| 44 | u16 settlingtime; |
| 45 | u8 reserved1; |
| 46 | u8 numpst; |
| 47 | }; |
| 48 | |
| 49 | struct pst_s { |
| 50 | u32 cpuid; |
| 51 | u8 fsbspeed; |
| 52 | u8 maxfid; |
| 53 | u8 startvid; |
| 54 | u8 numpstates; |
| 55 | }; |
| 56 | |
| 57 | #ifdef CONFIG_X86_POWERNOW_K7_ACPI |
| 58 | union powernow_acpi_control_t { |
| 59 | struct { |
| 60 | unsigned long fid:5, |
Dave Jones | b9e7638 | 2009-01-18 00:32:26 -0500 | [diff] [blame] | 61 | vid:5, |
| 62 | sgtc:20, |
| 63 | res1:2; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 64 | } bits; |
| 65 | unsigned long val; |
| 66 | }; |
| 67 | #endif |
| 68 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 69 | /* divide by 1000 to get VCore voltage in V. */ |
Dave Jones | bd5ab26 | 2007-02-22 19:11:16 -0500 | [diff] [blame] | 70 | static const int mobile_vid_table[32] = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 71 | 2000, 1950, 1900, 1850, 1800, 1750, 1700, 1650, |
| 72 | 1600, 1550, 1500, 1450, 1400, 1350, 1300, 0, |
| 73 | 1275, 1250, 1225, 1200, 1175, 1150, 1125, 1100, |
| 74 | 1075, 1050, 1025, 1000, 975, 950, 925, 0, |
| 75 | }; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 76 | |
| 77 | /* divide by 10 to get FID. */ |
Dave Jones | bd5ab26 | 2007-02-22 19:11:16 -0500 | [diff] [blame] | 78 | static const int fid_codes[32] = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 79 | 110, 115, 120, 125, 50, 55, 60, 65, |
| 80 | 70, 75, 80, 85, 90, 95, 100, 105, |
| 81 | 30, 190, 40, 200, 130, 135, 140, 210, |
| 82 | 150, 225, 160, 165, 170, 180, -1, -1, |
| 83 | }; |
| 84 | |
| 85 | /* This parameter is used in order to force ACPI instead of legacy method for |
| 86 | * configuration purpose. |
| 87 | */ |
| 88 | |
| 89 | static int acpi_force; |
| 90 | |
| 91 | static struct cpufreq_frequency_table *powernow_table; |
| 92 | |
| 93 | static unsigned int can_scale_bus; |
| 94 | static unsigned int can_scale_vid; |
Dave Jones | fff78ad | 2009-01-17 22:28:42 -0500 | [diff] [blame] | 95 | static unsigned int minimum_speed = -1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 96 | static unsigned int maximum_speed; |
| 97 | static unsigned int number_scales; |
| 98 | static unsigned int fsb; |
| 99 | static unsigned int latency; |
| 100 | static char have_a0; |
| 101 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 102 | static int check_fsb(unsigned int fsbspeed) |
| 103 | { |
| 104 | int delta; |
| 105 | unsigned int f = fsb / 1000; |
| 106 | |
| 107 | delta = (fsbspeed > f) ? fsbspeed - f : f - fsbspeed; |
Dave Jones | b9e7638 | 2009-01-18 00:32:26 -0500 | [diff] [blame] | 108 | return delta < 5; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 109 | } |
| 110 | |
Andi Kleen | fa8031a | 2012-01-26 00:09:12 +0100 | [diff] [blame] | 111 | static const struct x86_cpu_id powernow_k7_cpuids[] = { |
Thomas Gleixner | b11d77f | 2020-03-24 14:51:51 +0100 | [diff] [blame] | 112 | X86_MATCH_VENDOR_FAM(AMD, 6, NULL), |
Andi Kleen | fa8031a | 2012-01-26 00:09:12 +0100 | [diff] [blame] | 113 | {} |
| 114 | }; |
| 115 | MODULE_DEVICE_TABLE(x86cpu, powernow_k7_cpuids); |
| 116 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 117 | static int check_powernow(void) |
| 118 | { |
Mike Travis | 92cb761 | 2007-10-19 20:35:04 +0200 | [diff] [blame] | 119 | struct cpuinfo_x86 *c = &cpu_data(0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 120 | unsigned int maxei, eax, ebx, ecx, edx; |
| 121 | |
Andi Kleen | fa8031a | 2012-01-26 00:09:12 +0100 | [diff] [blame] | 122 | if (!x86_match_cpu(powernow_k7_cpuids)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 123 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 124 | |
| 125 | /* Get maximum capabilities */ |
Dave Jones | b9e7638 | 2009-01-18 00:32:26 -0500 | [diff] [blame] | 126 | maxei = cpuid_eax(0x80000000); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 127 | if (maxei < 0x80000007) { /* Any powernow info ? */ |
| 128 | #ifdef MODULE |
Joe Perches | 1c5864e | 2016-04-05 13:28:25 -0700 | [diff] [blame] | 129 | pr_info("No powernow capabilities detected\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 130 | #endif |
| 131 | return 0; |
| 132 | } |
| 133 | |
Jia Zhang | b399151 | 2018-01-01 09:52:10 +0800 | [diff] [blame] | 134 | if ((c->x86_model == 6) && (c->x86_stepping == 0)) { |
Joe Perches | 1c5864e | 2016-04-05 13:28:25 -0700 | [diff] [blame] | 135 | pr_info("K7 660[A0] core detected, enabling errata workarounds\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 136 | have_a0 = 1; |
| 137 | } |
| 138 | |
| 139 | cpuid(0x80000007, &eax, &ebx, &ecx, &edx); |
| 140 | |
| 141 | /* Check we can actually do something before we say anything.*/ |
| 142 | if (!(edx & (1 << 1 | 1 << 2))) |
| 143 | return 0; |
| 144 | |
Joe Perches | 1c5864e | 2016-04-05 13:28:25 -0700 | [diff] [blame] | 145 | pr_info("PowerNOW! Technology present. Can scale: "); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 146 | |
| 147 | if (edx & 1 << 1) { |
Joe Perches | b49c22a | 2016-04-05 13:28:24 -0700 | [diff] [blame] | 148 | pr_cont("frequency"); |
Dave Jones | b9e7638 | 2009-01-18 00:32:26 -0500 | [diff] [blame] | 149 | can_scale_bus = 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 150 | } |
| 151 | |
| 152 | if ((edx & (1 << 1 | 1 << 2)) == 0x6) |
Joe Perches | b49c22a | 2016-04-05 13:28:24 -0700 | [diff] [blame] | 153 | pr_cont(" and "); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 154 | |
| 155 | if (edx & 1 << 2) { |
Joe Perches | b49c22a | 2016-04-05 13:28:24 -0700 | [diff] [blame] | 156 | pr_cont("voltage"); |
Dave Jones | b9e7638 | 2009-01-18 00:32:26 -0500 | [diff] [blame] | 157 | can_scale_vid = 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 158 | } |
| 159 | |
Joe Perches | b49c22a | 2016-04-05 13:28:24 -0700 | [diff] [blame] | 160 | pr_cont("\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 161 | return 1; |
| 162 | } |
| 163 | |
Dave Jones | d38e73e | 2009-04-23 13:36:12 -0400 | [diff] [blame] | 164 | #ifdef CONFIG_X86_POWERNOW_K7_ACPI |
Dave Jones | b9e7638 | 2009-01-18 00:32:26 -0500 | [diff] [blame] | 165 | static void invalidate_entry(unsigned int entry) |
| 166 | { |
| 167 | powernow_table[entry].frequency = CPUFREQ_ENTRY_INVALID; |
| 168 | } |
Dave Jones | d38e73e | 2009-04-23 13:36:12 -0400 | [diff] [blame] | 169 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 170 | |
Dave Jones | b9e7638 | 2009-01-18 00:32:26 -0500 | [diff] [blame] | 171 | static int get_ranges(unsigned char *pst) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 172 | { |
| 173 | unsigned int j; |
| 174 | unsigned int speed; |
| 175 | u8 fid, vid; |
| 176 | |
Viresh Kumar | d5b73cd | 2013-08-06 22:53:06 +0530 | [diff] [blame] | 177 | powernow_table = kzalloc((sizeof(*powernow_table) * |
Dave Jones | b9e7638 | 2009-01-18 00:32:26 -0500 | [diff] [blame] | 178 | (number_scales + 1)), GFP_KERNEL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 179 | if (!powernow_table) |
| 180 | return -ENOMEM; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 181 | |
Dave Jones | b9e7638 | 2009-01-18 00:32:26 -0500 | [diff] [blame] | 182 | for (j = 0 ; j < number_scales; j++) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 183 | fid = *pst++; |
| 184 | |
| 185 | powernow_table[j].frequency = (fsb * fid_codes[fid]) / 10; |
Viresh Kumar | 5070158 | 2013-03-30 16:25:15 +0530 | [diff] [blame] | 186 | powernow_table[j].driver_data = fid; /* lower 8 bits */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 187 | |
| 188 | speed = powernow_table[j].frequency; |
| 189 | |
Dave Jones | b9e7638 | 2009-01-18 00:32:26 -0500 | [diff] [blame] | 190 | if ((fid_codes[fid] % 10) == 5) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 191 | #ifdef CONFIG_X86_POWERNOW_K7_ACPI |
| 192 | if (have_a0 == 1) |
Dave Jones | b9e7638 | 2009-01-18 00:32:26 -0500 | [diff] [blame] | 193 | invalidate_entry(j); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 194 | #endif |
| 195 | } |
| 196 | |
| 197 | if (speed < minimum_speed) |
| 198 | minimum_speed = speed; |
| 199 | if (speed > maximum_speed) |
| 200 | maximum_speed = speed; |
| 201 | |
| 202 | vid = *pst++; |
Viresh Kumar | 5070158 | 2013-03-30 16:25:15 +0530 | [diff] [blame] | 203 | powernow_table[j].driver_data |= (vid << 8); /* upper 8 bits */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 204 | |
Dominik Brodowski | 2d06d8c | 2011-03-27 15:04:46 +0200 | [diff] [blame] | 205 | pr_debug(" FID: 0x%x (%d.%dx [%dMHz]) " |
Dave Jones | 32ee8c3 | 2006-02-28 00:43:23 -0500 | [diff] [blame] | 206 | "VID: 0x%x (%d.%03dV)\n", fid, fid_codes[fid] / 10, |
| 207 | fid_codes[fid] % 10, speed/1000, vid, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 208 | mobile_vid_table[vid]/1000, |
| 209 | mobile_vid_table[vid]%1000); |
| 210 | } |
| 211 | powernow_table[number_scales].frequency = CPUFREQ_TABLE_END; |
Viresh Kumar | 5070158 | 2013-03-30 16:25:15 +0530 | [diff] [blame] | 212 | powernow_table[number_scales].driver_data = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 213 | |
| 214 | return 0; |
| 215 | } |
| 216 | |
| 217 | |
| 218 | static void change_FID(int fid) |
| 219 | { |
| 220 | union msr_fidvidctl fidvidctl; |
| 221 | |
Dave Jones | b9e7638 | 2009-01-18 00:32:26 -0500 | [diff] [blame] | 222 | rdmsrl(MSR_K7_FID_VID_CTL, fidvidctl.val); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 223 | if (fidvidctl.bits.FID != fid) { |
| 224 | fidvidctl.bits.SGTC = latency; |
| 225 | fidvidctl.bits.FID = fid; |
| 226 | fidvidctl.bits.VIDC = 0; |
| 227 | fidvidctl.bits.FIDC = 1; |
Dave Jones | b9e7638 | 2009-01-18 00:32:26 -0500 | [diff] [blame] | 228 | wrmsrl(MSR_K7_FID_VID_CTL, fidvidctl.val); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 229 | } |
| 230 | } |
| 231 | |
| 232 | |
| 233 | static void change_VID(int vid) |
| 234 | { |
| 235 | union msr_fidvidctl fidvidctl; |
| 236 | |
Dave Jones | b9e7638 | 2009-01-18 00:32:26 -0500 | [diff] [blame] | 237 | rdmsrl(MSR_K7_FID_VID_CTL, fidvidctl.val); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 238 | if (fidvidctl.bits.VID != vid) { |
| 239 | fidvidctl.bits.SGTC = latency; |
| 240 | fidvidctl.bits.VID = vid; |
| 241 | fidvidctl.bits.FIDC = 0; |
| 242 | fidvidctl.bits.VIDC = 1; |
Dave Jones | b9e7638 | 2009-01-18 00:32:26 -0500 | [diff] [blame] | 243 | wrmsrl(MSR_K7_FID_VID_CTL, fidvidctl.val); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 244 | } |
| 245 | } |
| 246 | |
| 247 | |
Viresh Kumar | 9c0ebcf | 2013-10-25 19:45:48 +0530 | [diff] [blame] | 248 | static int powernow_target(struct cpufreq_policy *policy, unsigned int index) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 249 | { |
| 250 | u8 fid, vid; |
| 251 | struct cpufreq_freqs freqs; |
| 252 | union msr_fidvidstatus fidvidstatus; |
| 253 | int cfid; |
| 254 | |
| 255 | /* fid are the lower 8 bits of the index we stored into |
| 256 | * the cpufreq frequency table in powernow_decode_bios, |
| 257 | * vid are the upper 8 bits. |
| 258 | */ |
| 259 | |
Viresh Kumar | 5070158 | 2013-03-30 16:25:15 +0530 | [diff] [blame] | 260 | fid = powernow_table[index].driver_data & 0xFF; |
| 261 | vid = (powernow_table[index].driver_data & 0xFF00) >> 8; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 262 | |
Dave Jones | b9e7638 | 2009-01-18 00:32:26 -0500 | [diff] [blame] | 263 | rdmsrl(MSR_K7_FID_VID_STATUS, fidvidstatus.val); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 264 | cfid = fidvidstatus.bits.CFID; |
| 265 | freqs.old = fsb * fid_codes[cfid] / 10; |
| 266 | |
| 267 | freqs.new = powernow_table[index].frequency; |
| 268 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 269 | /* Now do the magic poking into the MSRs. */ |
| 270 | |
| 271 | if (have_a0 == 1) /* A0 errata 5 */ |
| 272 | local_irq_disable(); |
| 273 | |
| 274 | if (freqs.old > freqs.new) { |
| 275 | /* Going down, so change FID first */ |
| 276 | change_FID(fid); |
| 277 | change_VID(vid); |
| 278 | } else { |
| 279 | /* Going up, so change VID first */ |
| 280 | change_VID(vid); |
| 281 | change_FID(fid); |
| 282 | } |
| 283 | |
| 284 | |
| 285 | if (have_a0 == 1) |
| 286 | local_irq_enable(); |
| 287 | |
Viresh Kumar | 9c0ebcf | 2013-10-25 19:45:48 +0530 | [diff] [blame] | 288 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 289 | } |
| 290 | |
| 291 | |
| 292 | #ifdef CONFIG_X86_POWERNOW_K7_ACPI |
| 293 | |
| 294 | static struct acpi_processor_performance *acpi_processor_perf; |
| 295 | |
| 296 | static int powernow_acpi_init(void) |
| 297 | { |
| 298 | int i; |
| 299 | int retval = 0; |
| 300 | union powernow_acpi_control_t pc; |
| 301 | |
| 302 | if (acpi_processor_perf != NULL && powernow_table != NULL) { |
| 303 | retval = -EINVAL; |
| 304 | goto err0; |
| 305 | } |
| 306 | |
Viresh Kumar | d5b73cd | 2013-08-06 22:53:06 +0530 | [diff] [blame] | 307 | acpi_processor_perf = kzalloc(sizeof(*acpi_processor_perf), GFP_KERNEL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 308 | if (!acpi_processor_perf) { |
| 309 | retval = -ENOMEM; |
| 310 | goto err0; |
| 311 | } |
| 312 | |
Yinghai Lu | eaa9584 | 2009-06-06 14:51:36 -0700 | [diff] [blame] | 313 | if (!zalloc_cpumask_var(&acpi_processor_perf->shared_cpu_map, |
Rusty Russell | 2fdf66b | 2008-12-31 18:08:47 -0800 | [diff] [blame] | 314 | GFP_KERNEL)) { |
| 315 | retval = -ENOMEM; |
| 316 | goto err05; |
| 317 | } |
| 318 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 319 | if (acpi_processor_register_performance(acpi_processor_perf, 0)) { |
| 320 | retval = -EIO; |
| 321 | goto err1; |
| 322 | } |
| 323 | |
Dave Jones | b9e7638 | 2009-01-18 00:32:26 -0500 | [diff] [blame] | 324 | if (acpi_processor_perf->control_register.space_id != |
| 325 | ACPI_ADR_SPACE_FIXED_HARDWARE) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 326 | retval = -ENODEV; |
| 327 | goto err2; |
| 328 | } |
| 329 | |
Dave Jones | b9e7638 | 2009-01-18 00:32:26 -0500 | [diff] [blame] | 330 | if (acpi_processor_perf->status_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 | |
| 336 | number_scales = acpi_processor_perf->state_count; |
| 337 | |
| 338 | if (number_scales < 2) { |
| 339 | retval = -ENODEV; |
| 340 | goto err2; |
| 341 | } |
| 342 | |
Viresh Kumar | d5b73cd | 2013-08-06 22:53:06 +0530 | [diff] [blame] | 343 | powernow_table = kzalloc((sizeof(*powernow_table) * |
Dave Jones | b9e7638 | 2009-01-18 00:32:26 -0500 | [diff] [blame] | 344 | (number_scales + 1)), GFP_KERNEL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 345 | if (!powernow_table) { |
| 346 | retval = -ENOMEM; |
| 347 | goto err2; |
| 348 | } |
| 349 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 350 | pc.val = (unsigned long) acpi_processor_perf->states[0].control; |
| 351 | for (i = 0; i < number_scales; i++) { |
| 352 | u8 fid, vid; |
Daniel Drake | dc2585e | 2007-05-02 23:19:05 +0100 | [diff] [blame] | 353 | struct acpi_processor_px *state = |
| 354 | &acpi_processor_perf->states[i]; |
| 355 | unsigned int speed, speed_mhz; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 356 | |
Daniel Drake | dc2585e | 2007-05-02 23:19:05 +0100 | [diff] [blame] | 357 | pc.val = (unsigned long) state->control; |
Dominik Brodowski | 2d06d8c | 2011-03-27 15:04:46 +0200 | [diff] [blame] | 358 | 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] | 359 | i, |
Daniel Drake | dc2585e | 2007-05-02 23:19:05 +0100 | [diff] [blame] | 360 | (u32) state->core_frequency, |
| 361 | (u32) state->power, |
| 362 | (u32) state->transition_latency, |
| 363 | (u32) state->control, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 364 | pc.bits.sgtc); |
| 365 | |
| 366 | vid = pc.bits.vid; |
| 367 | fid = pc.bits.fid; |
| 368 | |
| 369 | powernow_table[i].frequency = fsb * fid_codes[fid] / 10; |
Viresh Kumar | 5070158 | 2013-03-30 16:25:15 +0530 | [diff] [blame] | 370 | powernow_table[i].driver_data = fid; /* lower 8 bits */ |
| 371 | powernow_table[i].driver_data |= (vid << 8); /* upper 8 bits */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 372 | |
| 373 | speed = powernow_table[i].frequency; |
Daniel Drake | dc2585e | 2007-05-02 23:19:05 +0100 | [diff] [blame] | 374 | speed_mhz = speed / 1000; |
| 375 | |
| 376 | /* processor_perflib will multiply the MHz value by 1000 to |
| 377 | * get a KHz value (e.g. 1266000). However, powernow-k7 works |
| 378 | * with true KHz values (e.g. 1266768). To ensure that all |
| 379 | * powernow frequencies are available, we must ensure that |
| 380 | * ACPI doesn't restrict them, so we round up the MHz value |
| 381 | * to ensure that perflib's computed KHz value is greater than |
| 382 | * or equal to powernow's KHz value. |
| 383 | */ |
| 384 | if (speed % 1000 > 0) |
| 385 | speed_mhz++; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 386 | |
Dave Jones | b9e7638 | 2009-01-18 00:32:26 -0500 | [diff] [blame] | 387 | if ((fid_codes[fid] % 10) == 5) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 388 | if (have_a0 == 1) |
Dave Jones | b9e7638 | 2009-01-18 00:32:26 -0500 | [diff] [blame] | 389 | invalidate_entry(i); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 390 | } |
| 391 | |
Dominik Brodowski | 2d06d8c | 2011-03-27 15:04:46 +0200 | [diff] [blame] | 392 | pr_debug(" FID: 0x%x (%d.%dx [%dMHz]) " |
Dave Jones | 32ee8c3 | 2006-02-28 00:43:23 -0500 | [diff] [blame] | 393 | "VID: 0x%x (%d.%03dV)\n", fid, fid_codes[fid] / 10, |
Daniel Drake | dc2585e | 2007-05-02 23:19:05 +0100 | [diff] [blame] | 394 | fid_codes[fid] % 10, speed_mhz, vid, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 395 | mobile_vid_table[vid]/1000, |
| 396 | mobile_vid_table[vid]%1000); |
| 397 | |
Daniel Drake | dc2585e | 2007-05-02 23:19:05 +0100 | [diff] [blame] | 398 | if (state->core_frequency != speed_mhz) { |
| 399 | state->core_frequency = speed_mhz; |
Dominik Brodowski | 2d06d8c | 2011-03-27 15:04:46 +0200 | [diff] [blame] | 400 | pr_debug(" Corrected ACPI frequency to %d\n", |
Daniel Drake | dc2585e | 2007-05-02 23:19:05 +0100 | [diff] [blame] | 401 | speed_mhz); |
| 402 | } |
| 403 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 404 | if (latency < pc.bits.sgtc) |
| 405 | latency = pc.bits.sgtc; |
| 406 | |
| 407 | if (speed < minimum_speed) |
| 408 | minimum_speed = speed; |
| 409 | if (speed > maximum_speed) |
| 410 | maximum_speed = speed; |
| 411 | } |
| 412 | |
| 413 | powernow_table[i].frequency = CPUFREQ_TABLE_END; |
Viresh Kumar | 5070158 | 2013-03-30 16:25:15 +0530 | [diff] [blame] | 414 | powernow_table[i].driver_data = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 415 | |
| 416 | /* notify BIOS that we exist */ |
| 417 | acpi_processor_notify_smm(THIS_MODULE); |
| 418 | |
| 419 | return 0; |
| 420 | |
| 421 | err2: |
Rafael J. Wysocki | b2f8dc4 | 2015-07-22 22:11:16 +0200 | [diff] [blame] | 422 | acpi_processor_unregister_performance(0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 423 | err1: |
Rusty Russell | 2fdf66b | 2008-12-31 18:08:47 -0800 | [diff] [blame] | 424 | free_cpumask_var(acpi_processor_perf->shared_cpu_map); |
| 425 | err05: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 426 | kfree(acpi_processor_perf); |
| 427 | err0: |
Joe Perches | 1c5864e | 2016-04-05 13:28:25 -0700 | [diff] [blame] | 428 | pr_warn("ACPI perflib can not be used on this platform\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 429 | acpi_processor_perf = NULL; |
| 430 | return retval; |
| 431 | } |
| 432 | #else |
| 433 | static int powernow_acpi_init(void) |
| 434 | { |
Joe Perches | 1c5864e | 2016-04-05 13:28:25 -0700 | [diff] [blame] | 435 | pr_info("no support for ACPI processor found - please recompile your kernel with ACPI processor\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 436 | return -EINVAL; |
| 437 | } |
| 438 | #endif |
| 439 | |
Dave Jones | b9e7638 | 2009-01-18 00:32:26 -0500 | [diff] [blame] | 440 | static void print_pst_entry(struct pst_s *pst, unsigned int j) |
| 441 | { |
Dominik Brodowski | 2d06d8c | 2011-03-27 15:04:46 +0200 | [diff] [blame] | 442 | pr_debug("PST:%d (@%p)\n", j, pst); |
| 443 | 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] | 444 | pst->cpuid, pst->fsbspeed, pst->maxfid, pst->startvid); |
| 445 | } |
| 446 | |
| 447 | static int powernow_decode_bios(int maxfid, int startvid) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 448 | { |
| 449 | struct psb_s *psb; |
| 450 | struct pst_s *pst; |
| 451 | unsigned int i, j; |
| 452 | unsigned char *p; |
| 453 | unsigned int etuple; |
| 454 | unsigned int ret; |
| 455 | |
| 456 | etuple = cpuid_eax(0x80000001); |
| 457 | |
Dave Jones | b9e7638 | 2009-01-18 00:32:26 -0500 | [diff] [blame] | 458 | for (i = 0xC0000; i < 0xffff0 ; i += 16) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 459 | |
| 460 | p = phys_to_virt(i); |
| 461 | |
Dave Jones | b9e7638 | 2009-01-18 00:32:26 -0500 | [diff] [blame] | 462 | if (memcmp(p, "AMDK7PNOW!", 10) == 0) { |
Dominik Brodowski | 2d06d8c | 2011-03-27 15:04:46 +0200 | [diff] [blame] | 463 | pr_debug("Found PSB header at %p\n", p); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 464 | psb = (struct psb_s *) p; |
Dominik Brodowski | 2d06d8c | 2011-03-27 15:04:46 +0200 | [diff] [blame] | 465 | pr_debug("Table version: 0x%x\n", psb->tableversion); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 466 | if (psb->tableversion != 0x12) { |
Joe Perches | 1c5864e | 2016-04-05 13:28:25 -0700 | [diff] [blame] | 467 | pr_info("Sorry, only v1.2 tables supported right now\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 468 | return -ENODEV; |
| 469 | } |
| 470 | |
Dominik Brodowski | 2d06d8c | 2011-03-27 15:04:46 +0200 | [diff] [blame] | 471 | pr_debug("Flags: 0x%x\n", psb->flags); |
Dave Jones | b9e7638 | 2009-01-18 00:32:26 -0500 | [diff] [blame] | 472 | if ((psb->flags & 1) == 0) |
Dominik Brodowski | 2d06d8c | 2011-03-27 15:04:46 +0200 | [diff] [blame] | 473 | pr_debug("Mobile voltage regulator\n"); |
Dave Jones | b9e7638 | 2009-01-18 00:32:26 -0500 | [diff] [blame] | 474 | else |
Dominik Brodowski | 2d06d8c | 2011-03-27 15:04:46 +0200 | [diff] [blame] | 475 | pr_debug("Desktop voltage regulator\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 476 | |
| 477 | latency = psb->settlingtime; |
| 478 | if (latency < 100) { |
Joe Perches | 1c5864e | 2016-04-05 13:28:25 -0700 | [diff] [blame] | 479 | pr_info("BIOS set settling time to %d microseconds. Should be at least 100. Correcting.\n", |
Joe Perches | b49c22a | 2016-04-05 13:28:24 -0700 | [diff] [blame] | 480 | latency); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 481 | latency = 100; |
| 482 | } |
Dominik Brodowski | 2d06d8c | 2011-03-27 15:04:46 +0200 | [diff] [blame] | 483 | pr_debug("Settling Time: %d microseconds.\n", |
Dave Jones | b9e7638 | 2009-01-18 00:32:26 -0500 | [diff] [blame] | 484 | psb->settlingtime); |
Dominik Brodowski | 2d06d8c | 2011-03-27 15:04:46 +0200 | [diff] [blame] | 485 | pr_debug("Has %d PST tables. (Only dumping ones " |
Dave Jones | b9e7638 | 2009-01-18 00:32:26 -0500 | [diff] [blame] | 486 | "relevant to this CPU).\n", |
| 487 | psb->numpst); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 488 | |
Viresh Kumar | d5b73cd | 2013-08-06 22:53:06 +0530 | [diff] [blame] | 489 | p += sizeof(*psb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 490 | |
| 491 | pst = (struct pst_s *) p; |
| 492 | |
Dave Jones | b9e7638 | 2009-01-18 00:32:26 -0500 | [diff] [blame] | 493 | for (j = 0; j < psb->numpst; j++) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 494 | pst = (struct pst_s *) p; |
| 495 | number_scales = pst->numpstates; |
| 496 | |
Dave Jones | b9e7638 | 2009-01-18 00:32:26 -0500 | [diff] [blame] | 497 | if ((etuple == pst->cpuid) && |
| 498 | check_fsb(pst->fsbspeed) && |
| 499 | (maxfid == pst->maxfid) && |
| 500 | (startvid == pst->startvid)) { |
| 501 | print_pst_entry(pst, j); |
Viresh Kumar | d5b73cd | 2013-08-06 22:53:06 +0530 | [diff] [blame] | 502 | p = (char *)pst + sizeof(*pst); |
Dave Jones | b9e7638 | 2009-01-18 00:32:26 -0500 | [diff] [blame] | 503 | ret = get_ranges(p); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 504 | return ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 505 | } else { |
Dave Jones | 8cbe016 | 2006-05-30 17:26:08 -0400 | [diff] [blame] | 506 | unsigned int k; |
Viresh Kumar | d5b73cd | 2013-08-06 22:53:06 +0530 | [diff] [blame] | 507 | p = (char *)pst + sizeof(*pst); |
Dave Jones | b9e7638 | 2009-01-18 00:32:26 -0500 | [diff] [blame] | 508 | for (k = 0; k < number_scales; k++) |
| 509 | p += 2; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 510 | } |
| 511 | } |
Joe Perches | 1c5864e | 2016-04-05 13:28:25 -0700 | [diff] [blame] | 512 | pr_info("No PST tables match this cpuid (0x%x)\n", |
Joe Perches | b49c22a | 2016-04-05 13:28:24 -0700 | [diff] [blame] | 513 | etuple); |
Joe Perches | 1c5864e | 2016-04-05 13:28:25 -0700 | [diff] [blame] | 514 | pr_info("This is indicative of a broken BIOS\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 515 | |
| 516 | return -EINVAL; |
| 517 | } |
| 518 | p++; |
| 519 | } |
| 520 | |
| 521 | return -ENODEV; |
| 522 | } |
| 523 | |
| 524 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 525 | /* |
| 526 | * We use the fact that the bus frequency is somehow |
| 527 | * a multiple of 100000/3 khz, then we compute sgtc according |
| 528 | * to this multiple. |
| 529 | * That way, we match more how AMD thinks all of that work. |
| 530 | * We will then get the same kind of behaviour already tested under |
| 531 | * the "well-known" other OS. |
| 532 | */ |
Paul Gortmaker | 2760984 | 2013-06-19 13:54:04 -0400 | [diff] [blame] | 533 | static int fixup_sgtc(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 534 | { |
| 535 | unsigned int sgtc; |
| 536 | unsigned int m; |
| 537 | |
| 538 | m = fsb / 3333; |
| 539 | if ((m % 10) >= 5) |
| 540 | m += 5; |
| 541 | |
| 542 | m /= 10; |
| 543 | |
| 544 | sgtc = 100 * m * latency; |
| 545 | sgtc = sgtc / 3; |
| 546 | if (sgtc > 0xfffff) { |
Joe Perches | 1c5864e | 2016-04-05 13:28:25 -0700 | [diff] [blame] | 547 | pr_warn("SGTC too large %d\n", sgtc); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 548 | sgtc = 0xfffff; |
| 549 | } |
| 550 | return sgtc; |
| 551 | } |
| 552 | |
| 553 | static unsigned int powernow_get(unsigned int cpu) |
| 554 | { |
| 555 | union msr_fidvidstatus fidvidstatus; |
| 556 | unsigned int cfid; |
| 557 | |
| 558 | if (cpu) |
| 559 | return 0; |
Dave Jones | b9e7638 | 2009-01-18 00:32:26 -0500 | [diff] [blame] | 560 | rdmsrl(MSR_K7_FID_VID_STATUS, fidvidstatus.val); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 561 | cfid = fidvidstatus.bits.CFID; |
| 562 | |
Dave Jones | b9e7638 | 2009-01-18 00:32:26 -0500 | [diff] [blame] | 563 | return fsb * fid_codes[cfid] / 10; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 564 | } |
| 565 | |
| 566 | |
Paul Gortmaker | 2760984 | 2013-06-19 13:54:04 -0400 | [diff] [blame] | 567 | static int acer_cpufreq_pst(const struct dmi_system_id *d) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 568 | { |
Joe Perches | 1c5864e | 2016-04-05 13:28:25 -0700 | [diff] [blame] | 569 | pr_warn("%s laptop with broken PST tables in BIOS detected\n", |
Dave Jones | b9e7638 | 2009-01-18 00:32:26 -0500 | [diff] [blame] | 570 | d->ident); |
Joe Perches | 1c5864e | 2016-04-05 13:28:25 -0700 | [diff] [blame] | 571 | pr_warn("You need to downgrade to 3A21 (09/09/2002), or try a newer BIOS than 3A71 (01/20/2003)\n"); |
| 572 | pr_warn("cpufreq scaling has been disabled as a result of this\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 573 | return 0; |
| 574 | } |
| 575 | |
| 576 | /* |
| 577 | * Some Athlon laptops have really fucked PST tables. |
| 578 | * A BIOS update is all that can save them. |
| 579 | * Mention this, and disable cpufreq. |
| 580 | */ |
Christoph Hellwig | 6faadbb | 2017-09-14 11:59:30 +0200 | [diff] [blame] | 581 | static const struct dmi_system_id powernow_dmi_table[] = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 582 | { |
| 583 | .callback = acer_cpufreq_pst, |
| 584 | .ident = "Acer Aspire", |
| 585 | .matches = { |
| 586 | DMI_MATCH(DMI_SYS_VENDOR, "Insyde Software"), |
| 587 | DMI_MATCH(DMI_BIOS_VERSION, "3A71"), |
| 588 | }, |
| 589 | }, |
| 590 | { } |
| 591 | }; |
| 592 | |
Paul Gortmaker | 2760984 | 2013-06-19 13:54:04 -0400 | [diff] [blame] | 593 | static int powernow_cpu_init(struct cpufreq_policy *policy) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 594 | { |
| 595 | union msr_fidvidstatus fidvidstatus; |
| 596 | int result; |
| 597 | |
| 598 | if (policy->cpu != 0) |
| 599 | return -ENODEV; |
| 600 | |
Dave Jones | b9e7638 | 2009-01-18 00:32:26 -0500 | [diff] [blame] | 601 | rdmsrl(MSR_K7_FID_VID_STATUS, fidvidstatus.val); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 602 | |
Dave Jones | 436fe7b | 2006-06-05 14:03:50 -0400 | [diff] [blame] | 603 | recalibrate_cpu_khz(); |
Dave Jones | 91350ed | 2005-05-31 19:03:45 -0700 | [diff] [blame] | 604 | |
| 605 | fsb = (10 * cpu_khz) / fid_codes[fidvidstatus.bits.CFID]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 606 | if (!fsb) { |
Joe Perches | 1c5864e | 2016-04-05 13:28:25 -0700 | [diff] [blame] | 607 | pr_warn("can not determine bus frequency\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 608 | return -EINVAL; |
| 609 | } |
Dominik Brodowski | 2d06d8c | 2011-03-27 15:04:46 +0200 | [diff] [blame] | 610 | pr_debug("FSB: %3dMHz\n", fsb/1000); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 611 | |
| 612 | if (dmi_check_system(powernow_dmi_table) || acpi_force) { |
Joe Perches | 1c5864e | 2016-04-05 13:28:25 -0700 | [diff] [blame] | 613 | pr_info("PSB/PST known to be broken - trying ACPI instead\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 614 | result = powernow_acpi_init(); |
| 615 | } else { |
Dave Jones | b9e7638 | 2009-01-18 00:32:26 -0500 | [diff] [blame] | 616 | result = powernow_decode_bios(fidvidstatus.bits.MFID, |
| 617 | fidvidstatus.bits.SVID); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 618 | if (result) { |
Joe Perches | 1c5864e | 2016-04-05 13:28:25 -0700 | [diff] [blame] | 619 | pr_info("Trying ACPI perflib\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 620 | maximum_speed = 0; |
| 621 | minimum_speed = -1; |
| 622 | latency = 0; |
| 623 | result = powernow_acpi_init(); |
| 624 | if (result) { |
Joe Perches | 1c5864e | 2016-04-05 13:28:25 -0700 | [diff] [blame] | 625 | pr_info("ACPI and legacy methods failed\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 626 | } |
| 627 | } else { |
| 628 | /* SGTC use the bus clock as timer */ |
| 629 | latency = fixup_sgtc(); |
Joe Perches | 1c5864e | 2016-04-05 13:28:25 -0700 | [diff] [blame] | 630 | pr_info("SGTC: %d\n", latency); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 631 | } |
| 632 | } |
| 633 | |
| 634 | if (result) |
| 635 | return result; |
| 636 | |
Joe Perches | 1c5864e | 2016-04-05 13:28:25 -0700 | [diff] [blame] | 637 | pr_info("Minimum speed %d MHz - Maximum speed %d MHz\n", |
Joe Perches | b49c22a | 2016-04-05 13:28:24 -0700 | [diff] [blame] | 638 | minimum_speed/1000, maximum_speed/1000); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 639 | |
Dave Jones | b9e7638 | 2009-01-18 00:32:26 -0500 | [diff] [blame] | 640 | policy->cpuinfo.transition_latency = |
| 641 | cpufreq_scale(2000000UL, fsb, latency); |
Viresh Kumar | e2376d1 | 2018-02-26 10:38:57 +0530 | [diff] [blame] | 642 | policy->freq_table = powernow_table; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 643 | |
Viresh Kumar | e2376d1 | 2018-02-26 10:38:57 +0530 | [diff] [blame] | 644 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 645 | } |
| 646 | |
Dave Jones | b9e7638 | 2009-01-18 00:32:26 -0500 | [diff] [blame] | 647 | static int powernow_cpu_exit(struct cpufreq_policy *policy) |
| 648 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 649 | #ifdef CONFIG_X86_POWERNOW_K7_ACPI |
| 650 | if (acpi_processor_perf) { |
Rafael J. Wysocki | b2f8dc4 | 2015-07-22 22:11:16 +0200 | [diff] [blame] | 651 | acpi_processor_unregister_performance(0); |
Rusty Russell | 2fdf66b | 2008-12-31 18:08:47 -0800 | [diff] [blame] | 652 | free_cpumask_var(acpi_processor_perf->shared_cpu_map); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 653 | kfree(acpi_processor_perf); |
| 654 | } |
| 655 | #endif |
| 656 | |
Jesper Juhl | 4ae6673 | 2005-06-25 14:58:48 -0700 | [diff] [blame] | 657 | kfree(powernow_table); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 658 | return 0; |
| 659 | } |
| 660 | |
Linus Torvalds | 221dee2 | 2007-02-26 14:55:48 -0800 | [diff] [blame] | 661 | static struct cpufreq_driver powernow_driver = { |
Viresh Kumar | d63bd27 | 2013-10-03 20:28:17 +0530 | [diff] [blame] | 662 | .verify = cpufreq_generic_frequency_table_verify, |
Viresh Kumar | 9c0ebcf | 2013-10-25 19:45:48 +0530 | [diff] [blame] | 663 | .target_index = powernow_target, |
Thomas Renninger | e2f74f3 | 2009-11-19 12:31:01 +0100 | [diff] [blame] | 664 | .get = powernow_get, |
| 665 | #ifdef CONFIG_X86_POWERNOW_K7_ACPI |
| 666 | .bios_limit = acpi_processor_get_bios_limit, |
| 667 | #endif |
| 668 | .init = powernow_cpu_init, |
| 669 | .exit = powernow_cpu_exit, |
| 670 | .name = "powernow-k7", |
Viresh Kumar | d63bd27 | 2013-10-03 20:28:17 +0530 | [diff] [blame] | 671 | .attr = cpufreq_generic_attr, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 672 | }; |
| 673 | |
Dave Jones | b9e7638 | 2009-01-18 00:32:26 -0500 | [diff] [blame] | 674 | static int __init powernow_init(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 675 | { |
Dave Jones | b9e7638 | 2009-01-18 00:32:26 -0500 | [diff] [blame] | 676 | if (check_powernow() == 0) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 677 | return -ENODEV; |
| 678 | return cpufreq_register_driver(&powernow_driver); |
| 679 | } |
| 680 | |
| 681 | |
Dave Jones | b9e7638 | 2009-01-18 00:32:26 -0500 | [diff] [blame] | 682 | static void __exit powernow_exit(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 683 | { |
| 684 | cpufreq_unregister_driver(&powernow_driver); |
| 685 | } |
| 686 | |
| 687 | module_param(acpi_force, int, 0444); |
| 688 | MODULE_PARM_DESC(acpi_force, "Force ACPI to be used."); |
| 689 | |
Dave Jones | d5e80b4 | 2014-12-19 11:20:43 -0500 | [diff] [blame] | 690 | MODULE_AUTHOR("Dave Jones"); |
Dave Jones | b9e7638 | 2009-01-18 00:32:26 -0500 | [diff] [blame] | 691 | MODULE_DESCRIPTION("Powernow driver for AMD K7 processors."); |
| 692 | MODULE_LICENSE("GPL"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 693 | |
| 694 | late_initcall(powernow_init); |
| 695 | module_exit(powernow_exit); |
| 696 | |