blob: c913906a719ee0f9b44598593b4900c201395596 [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
Dave Jonesf4432c52008-10-20 13:31:45 -04002 * (C) 2001-2004 Dave Jones. <davej@redhat.com>
Linus Torvalds1da177e2005-04-16 15:20:36 -07003 * (C) 2002 Padraig Brady. <padraig@antefacto.com>
4 *
5 * Licensed under the terms of the GNU GPL License version 2.
6 * Based upon datasheets & sample CPUs kindly provided by VIA.
7 *
8 * VIA have currently 3 different versions of Longhaul.
9 * Version 1 (Longhaul) uses the BCR2 MSR at 0x1147.
10 * It is present only in Samuel 1 (C5A), Samuel 2 (C5B) stepping 0.
Rafa³ Bilski2b8c0e12007-02-14 22:00:37 +010011 * Version 2 of longhaul is backward compatible with v1, but adds
12 * LONGHAUL MSR for purpose of both frequency and voltage scaling.
13 * Present in Samuel 2 (steppings 1-7 only) (C5B), and Ezra (C5C).
Linus Torvalds1da177e2005-04-16 15:20:36 -070014 * Version 3 of longhaul got renamed to Powersaver and redesigned
Rafa³ Bilski2b8c0e12007-02-14 22:00:37 +010015 * to use only the POWERSAVER MSR at 0x110a.
Linus Torvalds1da177e2005-04-16 15:20:36 -070016 * It is present in Ezra-T (C5M), Nehemiah (C5X) and above.
17 * It's pretty much the same feature wise to longhaul v2, though
18 * there is provision for scaling FSB too, but this doesn't work
19 * too well in practice so we don't even try to use this.
20 *
21 * BIG FAT DISCLAIMER: Work in progress code. Possibly *dangerous*
22 */
23
24#include <linux/kernel.h>
25#include <linux/module.h>
26#include <linux/moduleparam.h>
27#include <linux/init.h>
28#include <linux/cpufreq.h>
Rafa³ Bilski179da8e2006-08-08 19:12:20 +020029#include <linux/pci.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070030#include <linux/slab.h>
31#include <linux/string.h>
Rafał Bilski73e107d2007-05-28 21:56:19 +020032#include <linux/delay.h>
Dave Jonesac617bd2009-01-17 23:29:53 -050033#include <linux/timex.h>
34#include <linux/io.h>
35#include <linux/acpi.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070036
37#include <asm/msr.h>
Andi Kleenfa8031a2012-01-26 00:09:12 +010038#include <asm/cpu_device_id.h>
Rafa³ Bilskidadb49d2006-07-03 07:19:05 +020039#include <acpi/processor.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070040
41#include "longhaul.h"
42
43#define PFX "longhaul: "
44
45#define TYPE_LONGHAUL_V1 1
46#define TYPE_LONGHAUL_V2 2
47#define TYPE_POWERSAVER 3
48
49#define CPU_SAMUEL 1
50#define CPU_SAMUEL2 2
51#define CPU_EZRA 3
52#define CPU_EZRA_T 4
53#define CPU_NEHEMIAH 5
Rafa³ Bilski980342a2007-01-31 23:42:47 +010054#define CPU_NEHEMIAH_C 6
Linus Torvalds1da177e2005-04-16 15:20:36 -070055
Rafa³ Bilski264166e2006-12-24 14:04:23 +010056/* Flags */
57#define USE_ACPI_C3 (1 << 1)
58#define USE_NORTHBRIDGE (1 << 2)
59
Linus Torvalds1da177e2005-04-16 15:20:36 -070060static int cpu_model;
Dave Jonesac617bd2009-01-17 23:29:53 -050061static unsigned int numscales = 16;
Linus Torvalds1da177e2005-04-16 15:20:36 -070062static unsigned int fsb;
Rafa³ Bilskidb44aaf2006-08-16 01:07:33 +020063
Dave Jonesbd5ab262007-02-22 19:11:16 -050064static const struct mV_pos *vrm_mV_table;
65static const unsigned char *mV_vrm_table;
Rafa³ Bilskidb44aaf2006-08-16 01:07:33 +020066
67static unsigned int highest_speed, lowest_speed; /* kHz */
Linus Torvalds1da177e2005-04-16 15:20:36 -070068static unsigned int minmult, maxmult;
69static int can_scale_voltage;
Dave Jonesac617bd2009-01-17 23:29:53 -050070static struct acpi_processor *pr;
71static struct acpi_processor_cx *cx;
Rafał Bilski275bc6b2007-06-05 22:08:50 +020072static u32 acpi_regs_addr;
Rafa³ Bilski264166e2006-12-24 14:04:23 +010073static u8 longhaul_flags;
Rafał Bilski73e107d2007-05-28 21:56:19 +020074static unsigned int longhaul_index;
Linus Torvalds1da177e2005-04-16 15:20:36 -070075
76/* Module parameters */
Rafa³ Bilskidb44aaf2006-08-16 01:07:33 +020077static int scale_voltage;
Rafał Bilski905497c2007-07-08 21:51:26 +020078static int disable_acpi_c3;
Rafal Bilski52a26382007-10-07 00:24:32 -070079static int revid_errata;
Rafał Bilskib5811bc2012-12-15 00:45:02 +010080static int enable;
Linus Torvalds1da177e2005-04-16 15:20:36 -070081
Linus Torvalds1da177e2005-04-16 15:20:36 -070082/* Clock ratios multiplied by 10 */
Dave Jonesac617bd2009-01-17 23:29:53 -050083static int mults[32];
84static int eblcr[32];
Linus Torvalds1da177e2005-04-16 15:20:36 -070085static int longhaul_version;
86static struct cpufreq_frequency_table *longhaul_table;
87
Linus Torvalds1da177e2005-04-16 15:20:36 -070088static char speedbuffer[8];
89
90static char *print_speed(int speed)
91{
Dave Jonese2aa8732006-05-30 17:37:15 -040092 if (speed < 1000) {
Dave Jonesac617bd2009-01-17 23:29:53 -050093 snprintf(speedbuffer, sizeof(speedbuffer), "%dMHz", speed);
Dave Jonese2aa8732006-05-30 17:37:15 -040094 return speedbuffer;
95 }
96
97 if (speed%1000 == 0)
98 snprintf(speedbuffer, sizeof(speedbuffer),
99 "%dGHz", speed/1000);
100 else
101 snprintf(speedbuffer, sizeof(speedbuffer),
102 "%d.%dGHz", speed/1000, (speed%1000)/100);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700103
104 return speedbuffer;
105}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700106
107
108static unsigned int calc_speed(int mult)
109{
110 int khz;
111 khz = (mult/10)*fsb;
112 if (mult%10)
113 khz += fsb/2;
114 khz *= 1000;
115 return khz;
116}
117
118
119static int longhaul_get_cpu_mult(void)
120{
Dave Jonesac617bd2009-01-17 23:29:53 -0500121 unsigned long invalue = 0, lo, hi;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700122
Dave Jonesac617bd2009-01-17 23:29:53 -0500123 rdmsr(MSR_IA32_EBL_CR_POWERON, lo, hi);
124 invalue = (lo & (1<<22|1<<23|1<<24|1<<25))>>22;
125 if (longhaul_version == TYPE_LONGHAUL_V2 ||
126 longhaul_version == TYPE_POWERSAVER) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700127 if (lo & (1<<27))
Dave Jonesac617bd2009-01-17 23:29:53 -0500128 invalue += 16;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700129 }
Dave Jonesac617bd2009-01-17 23:29:53 -0500130 return eblcr[invalue];
Linus Torvalds1da177e2005-04-16 15:20:36 -0700131}
132
Rafa³ Bilskidadb49d2006-07-03 07:19:05 +0200133/* For processor with BCR2 MSR */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700134
Dave Jonesac617bd2009-01-17 23:29:53 -0500135static void do_longhaul1(unsigned int mults_index)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700136{
Rafa³ Bilskidadb49d2006-07-03 07:19:05 +0200137 union msr_bcr2 bcr2;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700138
Rafa³ Bilskidadb49d2006-07-03 07:19:05 +0200139 rdmsrl(MSR_VIA_BCR2, bcr2.val);
140 /* Enable software clock multiplier */
141 bcr2.bits.ESOFTBF = 1;
Dave Jonesac617bd2009-01-17 23:29:53 -0500142 bcr2.bits.CLOCKMUL = mults_index & 0xff;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700143
Rafa³ Bilskidadb49d2006-07-03 07:19:05 +0200144 /* Sync to timer tick */
Zachary Amsden4bb0d3e2005-09-03 15:56:36 -0700145 safe_halt();
Rafa³ Bilskidadb49d2006-07-03 07:19:05 +0200146 /* Change frequency on next halt or sleep */
147 wrmsrl(MSR_VIA_BCR2, bcr2.val);
Rafa³ Bilski179da8e2006-08-08 19:12:20 +0200148 /* Invoke transition */
149 ACPI_FLUSH_CPU_CACHE();
150 halt();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700151
Rafa³ Bilskidadb49d2006-07-03 07:19:05 +0200152 /* Disable software clock multiplier */
Dave Jones3be6a482005-05-31 19:03:51 -0700153 local_irq_disable();
Rafa³ Bilskidadb49d2006-07-03 07:19:05 +0200154 rdmsrl(MSR_VIA_BCR2, bcr2.val);
155 bcr2.bits.ESOFTBF = 0;
156 wrmsrl(MSR_VIA_BCR2, bcr2.val);
157}
Dave Jones3be6a482005-05-31 19:03:51 -0700158
Rafa³ Bilskidadb49d2006-07-03 07:19:05 +0200159/* For processor with Longhaul MSR */
Dave Jones11746312005-05-31 19:03:51 -0700160
Dave Jonesac617bd2009-01-17 23:29:53 -0500161static void do_powersaver(int cx_address, unsigned int mults_index,
Rafał Bilski73e107d2007-05-28 21:56:19 +0200162 unsigned int dir)
Rafa³ Bilskidadb49d2006-07-03 07:19:05 +0200163{
164 union msr_longhaul longhaul;
165 u32 t;
Dave Jones3be6a482005-05-31 19:03:51 -0700166
Rafa³ Bilskidadb49d2006-07-03 07:19:05 +0200167 rdmsrl(MSR_VIA_LONGHAUL, longhaul.val);
Rafa³ Bilski348f31e2007-02-08 18:56:04 +0100168 /* Setup new frequency */
Rafal Bilski52a26382007-10-07 00:24:32 -0700169 if (!revid_errata)
170 longhaul.bits.RevisionKey = longhaul.bits.RevisionID;
171 else
172 longhaul.bits.RevisionKey = 0;
Dave Jonesac617bd2009-01-17 23:29:53 -0500173 longhaul.bits.SoftBusRatio = mults_index & 0xf;
174 longhaul.bits.SoftBusRatio4 = (mults_index & 0x10) >> 4;
Rafa³ Bilski348f31e2007-02-08 18:56:04 +0100175 /* Setup new voltage */
176 if (can_scale_voltage)
Dave Jonesac617bd2009-01-17 23:29:53 -0500177 longhaul.bits.SoftVID = (mults_index >> 8) & 0x1f;
Rafa³ Bilskidadb49d2006-07-03 07:19:05 +0200178 /* Sync to timer tick */
179 safe_halt();
Rafa³ Bilski348f31e2007-02-08 18:56:04 +0100180 /* Raise voltage if necessary */
Rafał Bilski73e107d2007-05-28 21:56:19 +0200181 if (can_scale_voltage && dir) {
Rafa³ Bilski348f31e2007-02-08 18:56:04 +0100182 longhaul.bits.EnableSoftVID = 1;
183 wrmsrl(MSR_VIA_LONGHAUL, longhaul.val);
184 /* Change voltage */
185 if (!cx_address) {
186 ACPI_FLUSH_CPU_CACHE();
187 halt();
188 } else {
189 ACPI_FLUSH_CPU_CACHE();
190 /* Invoke C3 */
191 inb(cx_address);
192 /* Dummy op - must do something useless after P_LVL3
193 * read */
Dave Jonesbd0561c2007-02-10 20:36:29 -0500194 t = inl(acpi_gbl_FADT.xpm_timer_block.address);
Rafa³ Bilski348f31e2007-02-08 18:56:04 +0100195 }
196 longhaul.bits.EnableSoftVID = 0;
197 wrmsrl(MSR_VIA_LONGHAUL, longhaul.val);
Rafa³ Bilski348f31e2007-02-08 18:56:04 +0100198 }
199
Rafa³ Bilskidadb49d2006-07-03 07:19:05 +0200200 /* Change frequency on next halt or sleep */
Rafa³ Bilski348f31e2007-02-08 18:56:04 +0100201 longhaul.bits.EnableSoftBusRatio = 1;
Rafa³ Bilskidadb49d2006-07-03 07:19:05 +0200202 wrmsrl(MSR_VIA_LONGHAUL, longhaul.val);
Rafa³ Bilski264166e2006-12-24 14:04:23 +0100203 if (!cx_address) {
rafalbilski@interia.pl7f1be892006-09-24 20:28:13 +0200204 ACPI_FLUSH_CPU_CACHE();
rafalbilski@interia.pl7f1be892006-09-24 20:28:13 +0200205 halt();
206 } else {
207 ACPI_FLUSH_CPU_CACHE();
208 /* Invoke C3 */
209 inb(cx_address);
210 /* Dummy op - must do something useless after P_LVL3 read */
Alexey Starikovskiycee324b2007-02-02 19:48:22 +0300211 t = inl(acpi_gbl_FADT.xpm_timer_block.address);
rafalbilski@interia.pl7f1be892006-09-24 20:28:13 +0200212 }
Rafa³ Bilskidadb49d2006-07-03 07:19:05 +0200213 /* Disable bus ratio bit */
Rafa³ Bilskidadb49d2006-07-03 07:19:05 +0200214 longhaul.bits.EnableSoftBusRatio = 0;
Rafa³ Bilskidadb49d2006-07-03 07:19:05 +0200215 wrmsrl(MSR_VIA_LONGHAUL, longhaul.val);
Rafa³ Bilski348f31e2007-02-08 18:56:04 +0100216
217 /* Reduce voltage if necessary */
Rafał Bilski73e107d2007-05-28 21:56:19 +0200218 if (can_scale_voltage && !dir) {
Rafa³ Bilski348f31e2007-02-08 18:56:04 +0100219 longhaul.bits.EnableSoftVID = 1;
220 wrmsrl(MSR_VIA_LONGHAUL, longhaul.val);
221 /* Change voltage */
222 if (!cx_address) {
223 ACPI_FLUSH_CPU_CACHE();
224 halt();
225 } else {
226 ACPI_FLUSH_CPU_CACHE();
227 /* Invoke C3 */
228 inb(cx_address);
229 /* Dummy op - must do something useless after P_LVL3
230 * read */
Dave Jonesbd0561c2007-02-10 20:36:29 -0500231 t = inl(acpi_gbl_FADT.xpm_timer_block.address);
Rafa³ Bilski348f31e2007-02-08 18:56:04 +0100232 }
233 longhaul.bits.EnableSoftVID = 0;
234 wrmsrl(MSR_VIA_LONGHAUL, longhaul.val);
Rafa³ Bilski348f31e2007-02-08 18:56:04 +0100235 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700236}
237
238/**
239 * longhaul_set_cpu_frequency()
Dave Jonesac617bd2009-01-17 23:29:53 -0500240 * @mults_index : bitpattern of the new multiplier.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700241 *
242 * Sets a new clock ratio.
243 */
244
Srivatsa S. Bhat7aa05572014-04-29 00:24:09 +0530245static int longhaul_setstate(struct cpufreq_policy *policy,
Viresh Kumarb43a7ff2013-03-24 11:56:43 +0530246 unsigned int table_index)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700247{
Dave Jonesac617bd2009-01-17 23:29:53 -0500248 unsigned int mults_index;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700249 int speed, mult;
250 struct cpufreq_freqs freqs;
Rafa³ Bilskidadb49d2006-07-03 07:19:05 +0200251 unsigned long flags;
252 unsigned int pic1_mask, pic2_mask;
Rafał Bilski689eba72007-06-07 22:31:24 +0200253 u16 bm_status = 0;
Rafał Bilski275bc6b2007-06-05 22:08:50 +0200254 u32 bm_timeout = 1000;
Rafał Bilski73e107d2007-05-28 21:56:19 +0200255 unsigned int dir = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700256
Viresh Kumar50701582013-03-30 16:25:15 +0530257 mults_index = longhaul_table[table_index].driver_data;
Rafał Bilski73e107d2007-05-28 21:56:19 +0200258 /* Safety precautions */
Dave Jonesac617bd2009-01-17 23:29:53 -0500259 mult = mults[mults_index & 0x1f];
Linus Torvalds1da177e2005-04-16 15:20:36 -0700260 if (mult == -1)
Srivatsa S. Bhat7aa05572014-04-29 00:24:09 +0530261 return -EINVAL;
262
Linus Torvalds1da177e2005-04-16 15:20:36 -0700263 speed = calc_speed(mult);
264 if ((speed > highest_speed) || (speed < lowest_speed))
Srivatsa S. Bhat7aa05572014-04-29 00:24:09 +0530265 return -EINVAL;
266
Rafał Bilski73e107d2007-05-28 21:56:19 +0200267 /* Voltage transition before frequency transition? */
268 if (can_scale_voltage && longhaul_index < table_index)
269 dir = 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700270
271 freqs.old = calc_speed(longhaul_get_cpu_mult());
272 freqs.new = speed;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700273
Dominik Brodowski2d06d8c2011-03-27 15:04:46 +0200274 pr_debug("Setting to FSB:%dMHz Mult:%d.%dx (%s)\n",
Linus Torvalds1da177e2005-04-16 15:20:36 -0700275 fsb, mult/10, mult%10, print_speed(speed/1000));
Rafal Bilski52a26382007-10-07 00:24:32 -0700276retry_loop:
Rafa³ Bilskidadb49d2006-07-03 07:19:05 +0200277 preempt_disable();
278 local_irq_save(flags);
279
280 pic2_mask = inb(0xA1);
281 pic1_mask = inb(0x21); /* works on C3. save mask. */
Dave Jonesac617bd2009-01-17 23:29:53 -0500282 outb(0xFF, 0xA1); /* Overkill */
283 outb(0xFE, 0x21); /* TMR0 only */
Rafa³ Bilskidadb49d2006-07-03 07:19:05 +0200284
Rafał Bilski489dc5c2007-05-17 22:39:02 +0200285 /* Wait while PCI bus is busy. */
Rafał Bilski689eba72007-06-07 22:31:24 +0200286 if (acpi_regs_addr && (longhaul_flags & USE_NORTHBRIDGE
287 || ((pr != NULL) && pr->flags.bm_control))) {
288 bm_status = inw(acpi_regs_addr);
Rafał Bilski275bc6b2007-06-05 22:08:50 +0200289 bm_status &= 1 << 4;
Rafał Bilski489dc5c2007-05-17 22:39:02 +0200290 while (bm_status && bm_timeout) {
Rafał Bilski689eba72007-06-07 22:31:24 +0200291 outw(1 << 4, acpi_regs_addr);
Rafał Bilski489dc5c2007-05-17 22:39:02 +0200292 bm_timeout--;
Rafał Bilski689eba72007-06-07 22:31:24 +0200293 bm_status = inw(acpi_regs_addr);
Rafał Bilski275bc6b2007-06-05 22:08:50 +0200294 bm_status &= 1 << 4;
Rafał Bilski489dc5c2007-05-17 22:39:02 +0200295 }
296 }
297
Rafa³ Bilski264166e2006-12-24 14:04:23 +0100298 if (longhaul_flags & USE_NORTHBRIDGE) {
299 /* Disable AGP and PCI arbiters */
300 outb(3, 0x22);
301 } else if ((pr != NULL) && pr->flags.bm_control) {
Rafał Bilski73e107d2007-05-28 21:56:19 +0200302 /* Disable bus master arbitration */
Lin Mingfb318cb2009-03-18 09:09:01 +0800303 acpi_write_bit_register(ACPI_BITREG_ARB_DISABLE, 1);
Rafa³ Bilskidadb49d2006-07-03 07:19:05 +0200304 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700305 switch (longhaul_version) {
306
307 /*
308 * Longhaul v1. (Samuel[C5A] and Samuel2 stepping 0[C5B])
309 * Software controlled multipliers only.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700310 */
311 case TYPE_LONGHAUL_V1:
Dave Jonesac617bd2009-01-17 23:29:53 -0500312 do_longhaul1(mults_index);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700313 break;
314
315 /*
Rafa³ Bilski2b8c0e12007-02-14 22:00:37 +0100316 * Longhaul v2 appears in Samuel2 Steppings 1->7 [C5B] and Ezra [C5C]
317 *
Linus Torvalds1da177e2005-04-16 15:20:36 -0700318 * Longhaul v3 (aka Powersaver). (Ezra-T [C5M] & Nehemiah [C5N])
Linus Torvalds1da177e2005-04-16 15:20:36 -0700319 * Nehemiah can do FSB scaling too, but this has never been proven
320 * to work in practice.
321 */
Rafa³ Bilski2b8c0e12007-02-14 22:00:37 +0100322 case TYPE_LONGHAUL_V2:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700323 case TYPE_POWERSAVER:
Rafa³ Bilski264166e2006-12-24 14:04:23 +0100324 if (longhaul_flags & USE_ACPI_C3) {
325 /* Don't allow wakeup */
Lin Mingfb318cb2009-03-18 09:09:01 +0800326 acpi_write_bit_register(ACPI_BITREG_BUS_MASTER_RLD, 0);
Dave Jonesac617bd2009-01-17 23:29:53 -0500327 do_powersaver(cx->address, mults_index, dir);
Rafa³ Bilski264166e2006-12-24 14:04:23 +0100328 } else {
Dave Jonesac617bd2009-01-17 23:29:53 -0500329 do_powersaver(0, mults_index, dir);
Rafa³ Bilski264166e2006-12-24 14:04:23 +0100330 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700331 break;
332 }
333
Rafa³ Bilski264166e2006-12-24 14:04:23 +0100334 if (longhaul_flags & USE_NORTHBRIDGE) {
335 /* Enable arbiters */
336 outb(0, 0x22);
337 } else if ((pr != NULL) && pr->flags.bm_control) {
Rafa³ Bilski179da8e2006-08-08 19:12:20 +0200338 /* Enable bus master arbitration */
Lin Mingfb318cb2009-03-18 09:09:01 +0800339 acpi_write_bit_register(ACPI_BITREG_ARB_DISABLE, 0);
Rafa³ Bilskidadb49d2006-07-03 07:19:05 +0200340 }
Dave Jonesac617bd2009-01-17 23:29:53 -0500341 outb(pic2_mask, 0xA1); /* restore mask */
342 outb(pic1_mask, 0x21);
Rafa³ Bilskidadb49d2006-07-03 07:19:05 +0200343
344 local_irq_restore(flags);
345 preempt_enable();
346
Rafa³ Bilski2b8c0e12007-02-14 22:00:37 +0100347 freqs.new = calc_speed(longhaul_get_cpu_mult());
Rafal Bilski52a26382007-10-07 00:24:32 -0700348 /* Check if requested frequency is set. */
349 if (unlikely(freqs.new != speed)) {
350 printk(KERN_INFO PFX "Failed to set requested frequency!\n");
351 /* Revision ID = 1 but processor is expecting revision key
352 * equal to 0. Jumpers at the bottom of processor will change
353 * multiplier and FSB, but will not change bits in Longhaul
354 * MSR nor enable voltage scaling. */
355 if (!revid_errata) {
356 printk(KERN_INFO PFX "Enabling \"Ignore Revision ID\" "
357 "option.\n");
358 revid_errata = 1;
359 msleep(200);
360 goto retry_loop;
361 }
362 /* Why ACPI C3 sometimes doesn't work is a mystery for me.
363 * But it does happen. Processor is entering ACPI C3 state,
364 * but it doesn't change frequency. I tried poking various
365 * bits in northbridge registers, but without success. */
366 if (longhaul_flags & USE_ACPI_C3) {
367 printk(KERN_INFO PFX "Disabling ACPI C3 support.\n");
368 longhaul_flags &= ~USE_ACPI_C3;
369 if (revid_errata) {
370 printk(KERN_INFO PFX "Disabling \"Ignore "
371 "Revision ID\" option.\n");
372 revid_errata = 0;
373 }
374 msleep(200);
375 goto retry_loop;
376 }
377 /* This shouldn't happen. Longhaul ver. 2 was reported not
378 * working on processors without voltage scaling, but with
379 * RevID = 1. RevID errata will make things right. Just
380 * to be 100% sure. */
381 if (longhaul_version == TYPE_LONGHAUL_V2) {
382 printk(KERN_INFO PFX "Switching to Longhaul ver. 1\n");
383 longhaul_version = TYPE_LONGHAUL_V1;
384 msleep(200);
385 goto retry_loop;
386 }
387 }
Rafał Bilski489dc5c2007-05-17 22:39:02 +0200388
Srivatsa S. Bhat7aa05572014-04-29 00:24:09 +0530389 if (!bm_timeout) {
Dave Jonesac617bd2009-01-17 23:29:53 -0500390 printk(KERN_INFO PFX "Warning: Timeout while waiting for "
391 "idle PCI bus.\n");
Srivatsa S. Bhat7aa05572014-04-29 00:24:09 +0530392 return -EBUSY;
393 }
394
395 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700396}
397
398/*
399 * Centaur decided to make life a little more tricky.
400 * Only longhaul v1 is allowed to read EBLCR BSEL[0:1].
401 * Samuel2 and above have to try and guess what the FSB is.
402 * We do this by assuming we booted at maximum multiplier, and interpolate
403 * between that value multiplied by possible FSBs and cpu_mhz which
404 * was calculated at boot time. Really ugly, but no other way to do this.
405 */
406
407#define ROUNDING 0xf
408
Rafa³ Bilski24ebead2007-01-01 23:49:34 +0100409static int guess_fsb(int mult)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700410{
Rafa³ Bilski46ef9552007-02-04 15:58:46 +0100411 int speed = cpu_khz / 1000;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700412 int i;
Rafa³ Bilski46ef9552007-02-04 15:58:46 +0100413 int speeds[] = { 666, 1000, 1333, 2000 };
414 int f_max, f_min;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700415
Rafa³ Bilski46ef9552007-02-04 15:58:46 +0100416 for (i = 0; i < 4; i++) {
417 f_max = ((speeds[i] * mult) + 50) / 100;
418 f_max += (ROUNDING / 2);
419 f_min = f_max - ROUNDING;
420 if ((speed <= f_max) && (speed >= f_min))
421 return speeds[i] / 10;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700422 }
423 return 0;
424}
425
426
Paul Gortmaker27609842013-06-19 13:54:04 -0400427static int longhaul_get_ranges(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700428{
Rafał Bilski73e107d2007-05-28 21:56:19 +0200429 unsigned int i, j, k = 0;
430 unsigned int ratio;
Rafa³ Bilski980342a2007-01-31 23:42:47 +0100431 int mult;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700432
Rafa³ Bilski980342a2007-01-31 23:42:47 +0100433 /* Get current frequency */
434 mult = longhaul_get_cpu_mult();
435 if (mult == -1) {
436 printk(KERN_INFO PFX "Invalid (reserved) multiplier!\n");
437 return -EINVAL;
438 }
439 fsb = guess_fsb(mult);
440 if (fsb == 0) {
441 printk(KERN_INFO PFX "Invalid (reserved) FSB!\n");
442 return -EINVAL;
443 }
444 /* Get max multiplier - as we always did.
Lucas De Marchi0d2eb442011-03-17 16:24:16 -0300445 * Longhaul MSR is useful only when voltage scaling is enabled.
Rafa³ Bilski980342a2007-01-31 23:42:47 +0100446 * C3 is booting at max anyway. */
447 maxmult = mult;
448 /* Get min multiplier */
Rafa³ Bilski9addf3b2007-02-07 22:53:29 +0100449 switch (cpu_model) {
450 case CPU_NEHEMIAH:
451 minmult = 50;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700452 break;
Rafa³ Bilski9addf3b2007-02-07 22:53:29 +0100453 case CPU_NEHEMIAH_C:
454 minmult = 40;
455 break;
456 default:
457 minmult = 30;
Rafa³ Bilski980342a2007-01-31 23:42:47 +0100458 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700459 }
460
Dominik Brodowski2d06d8c2011-03-27 15:04:46 +0200461 pr_debug("MinMult:%d.%dx MaxMult:%d.%dx\n",
Linus Torvalds1da177e2005-04-16 15:20:36 -0700462 minmult/10, minmult%10, maxmult/10, maxmult%10);
463
Linus Torvalds1da177e2005-04-16 15:20:36 -0700464 highest_speed = calc_speed(maxmult);
465 lowest_speed = calc_speed(minmult);
Dominik Brodowski2d06d8c2011-03-27 15:04:46 +0200466 pr_debug("FSB:%dMHz Lowest speed: %s Highest speed:%s\n", fsb,
Alexey Starikovskiycee324b2007-02-02 19:48:22 +0300467 print_speed(lowest_speed/1000),
Linus Torvalds1da177e2005-04-16 15:20:36 -0700468 print_speed(highest_speed/1000));
469
470 if (lowest_speed == highest_speed) {
Dave Jonesac617bd2009-01-17 23:29:53 -0500471 printk(KERN_INFO PFX "highestspeed == lowest, aborting.\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700472 return -EINVAL;
473 }
474 if (lowest_speed > highest_speed) {
Dave Jonesac617bd2009-01-17 23:29:53 -0500475 printk(KERN_INFO PFX "nonsense! lowest (%d > %d) !\n",
Linus Torvalds1da177e2005-04-16 15:20:36 -0700476 lowest_speed, highest_speed);
477 return -EINVAL;
478 }
479
Viresh Kumar71508a12014-03-28 19:11:46 +0530480 longhaul_table = kzalloc((numscales + 1) * sizeof(*longhaul_table),
Dave Jonesac617bd2009-01-17 23:29:53 -0500481 GFP_KERNEL);
482 if (!longhaul_table)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700483 return -ENOMEM;
484
Rafał Bilski73e107d2007-05-28 21:56:19 +0200485 for (j = 0; j < numscales; j++) {
Dave Jonesac617bd2009-01-17 23:29:53 -0500486 ratio = mults[j];
Linus Torvalds1da177e2005-04-16 15:20:36 -0700487 if (ratio == -1)
488 continue;
489 if (ratio > maxmult || ratio < minmult)
490 continue;
491 longhaul_table[k].frequency = calc_speed(ratio);
Viresh Kumar50701582013-03-30 16:25:15 +0530492 longhaul_table[k].driver_data = j;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700493 k++;
494 }
Rafał Bilski73e107d2007-05-28 21:56:19 +0200495 if (k <= 1) {
496 kfree(longhaul_table);
497 return -ENODEV;
498 }
499 /* Sort */
500 for (j = 0; j < k - 1; j++) {
501 unsigned int min_f, min_i;
502 min_f = longhaul_table[j].frequency;
503 min_i = j;
504 for (i = j + 1; i < k; i++) {
505 if (longhaul_table[i].frequency < min_f) {
506 min_f = longhaul_table[i].frequency;
507 min_i = i;
508 }
509 }
510 if (min_i != j) {
Dave Jones91420222009-02-04 15:28:54 -0500511 swap(longhaul_table[j].frequency,
512 longhaul_table[min_i].frequency);
Viresh Kumar50701582013-03-30 16:25:15 +0530513 swap(longhaul_table[j].driver_data,
514 longhaul_table[min_i].driver_data);
Rafał Bilski73e107d2007-05-28 21:56:19 +0200515 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700516 }
517
Rafał Bilski73e107d2007-05-28 21:56:19 +0200518 longhaul_table[k].frequency = CPUFREQ_TABLE_END;
519
520 /* Find index we are running on */
521 for (j = 0; j < k; j++) {
Viresh Kumar50701582013-03-30 16:25:15 +0530522 if (mults[longhaul_table[j].driver_data & 0x1f] == mult) {
Rafał Bilski73e107d2007-05-28 21:56:19 +0200523 longhaul_index = j;
524 break;
525 }
526 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700527 return 0;
528}
529
530
Paul Gortmaker27609842013-06-19 13:54:04 -0400531static void longhaul_setup_voltagescaling(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700532{
Stratos Karafotis041526f2014-04-25 23:15:38 +0300533 struct cpufreq_frequency_table *freq_pos;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700534 union msr_longhaul longhaul;
Rafał Bilski73e107d2007-05-28 21:56:19 +0200535 struct mV_pos minvid, maxvid, vid;
Rafa³ Bilskidb44aaf2006-08-16 01:07:33 +0200536 unsigned int j, speed, pos, kHz_step, numvscales;
Rafa³ Bilski348f31e2007-02-08 18:56:04 +0100537 int min_vid_speed;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700538
Rafa³ Bilskidb44aaf2006-08-16 01:07:33 +0200539 rdmsrl(MSR_VIA_LONGHAUL, longhaul.val);
540 if (!(longhaul.bits.RevisionID & 1)) {
541 printk(KERN_INFO PFX "Voltage scaling not supported by CPU.\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700542 return;
Rafa³ Bilskidb44aaf2006-08-16 01:07:33 +0200543 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700544
Rafa³ Bilskidb44aaf2006-08-16 01:07:33 +0200545 if (!longhaul.bits.VRMRev) {
Rafał Bilski73e107d2007-05-28 21:56:19 +0200546 printk(KERN_INFO PFX "VRM 8.5\n");
Rafa³ Bilskidb44aaf2006-08-16 01:07:33 +0200547 vrm_mV_table = &vrm85_mV[0];
548 mV_vrm_table = &mV_vrm85[0];
549 } else {
Rafał Bilski73e107d2007-05-28 21:56:19 +0200550 printk(KERN_INFO PFX "Mobile VRM\n");
Rafa³ Bilski2b8c0e12007-02-14 22:00:37 +0100551 if (cpu_model < CPU_NEHEMIAH)
552 return;
Rafa³ Bilskidb44aaf2006-08-16 01:07:33 +0200553 vrm_mV_table = &mobilevrm_mV[0];
554 mV_vrm_table = &mV_mobilevrm[0];
555 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700556
Rafa³ Bilskidb44aaf2006-08-16 01:07:33 +0200557 minvid = vrm_mV_table[longhaul.bits.MinimumVID];
558 maxvid = vrm_mV_table[longhaul.bits.MaximumVID];
Rafa³ Bilskidb44aaf2006-08-16 01:07:33 +0200559
560 if (minvid.mV == 0 || maxvid.mV == 0 || minvid.mV > maxvid.mV) {
Dave Jonesac617bd2009-01-17 23:29:53 -0500561 printk(KERN_INFO PFX "Bogus values Min:%d.%03d Max:%d.%03d. "
Linus Torvalds1da177e2005-04-16 15:20:36 -0700562 "Voltage scaling disabled.\n",
Dave Jonesac617bd2009-01-17 23:29:53 -0500563 minvid.mV/1000, minvid.mV%1000,
564 maxvid.mV/1000, maxvid.mV%1000);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700565 return;
566 }
567
Rafa³ Bilskidb44aaf2006-08-16 01:07:33 +0200568 if (minvid.mV == maxvid.mV) {
Dave Jonesac617bd2009-01-17 23:29:53 -0500569 printk(KERN_INFO PFX "Claims to support voltage scaling but "
570 "min & max are both %d.%03d. "
571 "Voltage scaling disabled\n",
Rafa³ Bilskidb44aaf2006-08-16 01:07:33 +0200572 maxvid.mV/1000, maxvid.mV%1000);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700573 return;
574 }
575
Dave Jonesac617bd2009-01-17 23:29:53 -0500576 /* How many voltage steps*/
Rafa³ Bilski348f31e2007-02-08 18:56:04 +0100577 numvscales = maxvid.pos - minvid.pos + 1;
578 printk(KERN_INFO PFX
579 "Max VID=%d.%03d "
580 "Min VID=%d.%03d, "
581 "%d possible voltage scales\n",
Rafa³ Bilskidb44aaf2006-08-16 01:07:33 +0200582 maxvid.mV/1000, maxvid.mV%1000,
583 minvid.mV/1000, minvid.mV%1000,
584 numvscales);
Rafa³ Bilski348f31e2007-02-08 18:56:04 +0100585
586 /* Calculate max frequency at min voltage */
587 j = longhaul.bits.MinMHzBR;
588 if (longhaul.bits.MinMHzBR4)
589 j += 16;
Dave Jonesac617bd2009-01-17 23:29:53 -0500590 min_vid_speed = eblcr[j];
Rafa³ Bilski348f31e2007-02-08 18:56:04 +0100591 if (min_vid_speed == -1)
592 return;
593 switch (longhaul.bits.MinMHzFSB) {
594 case 0:
595 min_vid_speed *= 13333;
596 break;
597 case 1:
598 min_vid_speed *= 10000;
599 break;
600 case 3:
601 min_vid_speed *= 6666;
602 break;
603 default:
604 return;
605 break;
606 }
607 if (min_vid_speed >= highest_speed)
608 return;
609 /* Calculate kHz for one voltage step */
610 kHz_step = (highest_speed - min_vid_speed) / numvscales;
611
Stratos Karafotis041526f2014-04-25 23:15:38 +0300612 cpufreq_for_each_entry(freq_pos, longhaul_table) {
613 speed = freq_pos->frequency;
Rafa³ Bilski348f31e2007-02-08 18:56:04 +0100614 if (speed > min_vid_speed)
615 pos = (speed - min_vid_speed) / kHz_step + minvid.pos;
616 else
617 pos = minvid.pos;
Stratos Karafotis041526f2014-04-25 23:15:38 +0300618 freq_pos->driver_data |= mV_vrm_table[pos] << 8;
Rafał Bilski73e107d2007-05-28 21:56:19 +0200619 vid = vrm_mV_table[mV_vrm_table[pos]];
Dave Jonesac617bd2009-01-17 23:29:53 -0500620 printk(KERN_INFO PFX "f: %d kHz, index: %d, vid: %d mV\n",
Stratos Karafotis041526f2014-04-25 23:15:38 +0300621 speed, (int)(freq_pos - longhaul_table), vid.mV);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700622 }
623
Linus Torvalds1da177e2005-04-16 15:20:36 -0700624 can_scale_voltage = 1;
Rafał Bilski73e107d2007-05-28 21:56:19 +0200625 printk(KERN_INFO PFX "Voltage scaling enabled.\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700626}
627
628
Linus Torvalds1da177e2005-04-16 15:20:36 -0700629static int longhaul_target(struct cpufreq_policy *policy,
Viresh Kumar9c0ebcf2013-10-25 19:45:48 +0530630 unsigned int table_index)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700631{
Rafał Bilski73e107d2007-05-28 21:56:19 +0200632 unsigned int i;
633 unsigned int dir = 0;
634 u8 vid, current_vid;
Srivatsa S. Bhat7aa05572014-04-29 00:24:09 +0530635 int retval = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700636
Rafał Bilski73e107d2007-05-28 21:56:19 +0200637 if (!can_scale_voltage)
Srivatsa S. Bhat7aa05572014-04-29 00:24:09 +0530638 retval = longhaul_setstate(policy, table_index);
Rafał Bilski73e107d2007-05-28 21:56:19 +0200639 else {
640 /* On test system voltage transitions exceeding single
641 * step up or down were turning motherboard off. Both
642 * "ondemand" and "userspace" are unsafe. C7 is doing
643 * this in hardware, C3 is old and we need to do this
644 * in software. */
645 i = longhaul_index;
Viresh Kumar50701582013-03-30 16:25:15 +0530646 current_vid = (longhaul_table[longhaul_index].driver_data >> 8);
Dave Jonesac617bd2009-01-17 23:29:53 -0500647 current_vid &= 0x1f;
Rafał Bilski73e107d2007-05-28 21:56:19 +0200648 if (table_index > longhaul_index)
649 dir = 1;
650 while (i != table_index) {
Viresh Kumar50701582013-03-30 16:25:15 +0530651 vid = (longhaul_table[i].driver_data >> 8) & 0x1f;
Rafał Bilski73e107d2007-05-28 21:56:19 +0200652 if (vid != current_vid) {
Srivatsa S. Bhat7aa05572014-04-29 00:24:09 +0530653 retval = longhaul_setstate(policy, i);
Rafał Bilski73e107d2007-05-28 21:56:19 +0200654 current_vid = vid;
655 msleep(200);
656 }
657 if (dir)
658 i++;
659 else
660 i--;
661 }
Srivatsa S. Bhat7aa05572014-04-29 00:24:09 +0530662 retval = longhaul_setstate(policy, table_index);
Rafał Bilski73e107d2007-05-28 21:56:19 +0200663 }
Srivatsa S. Bhat7aa05572014-04-29 00:24:09 +0530664
Rafał Bilski73e107d2007-05-28 21:56:19 +0200665 longhaul_index = table_index;
Srivatsa S. Bhat7aa05572014-04-29 00:24:09 +0530666 return retval;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700667}
668
669
670static unsigned int longhaul_get(unsigned int cpu)
671{
672 if (cpu)
673 return 0;
674 return calc_speed(longhaul_get_cpu_mult());
675}
676
Adrian Bunkc4a96c12006-07-09 19:53:08 +0200677static acpi_status longhaul_walk_callback(acpi_handle obj_handle,
678 u32 nesting_level,
679 void *context, void **return_value)
Rafa³ Bilskidadb49d2006-07-03 07:19:05 +0200680{
681 struct acpi_device *d;
682
Dave Jonesac617bd2009-01-17 23:29:53 -0500683 if (acpi_bus_get_device(obj_handle, &d))
Rafa³ Bilskidadb49d2006-07-03 07:19:05 +0200684 return 0;
Dave Jonesac617bd2009-01-17 23:29:53 -0500685
Jan Engelhardtade1af72008-01-30 13:33:23 +0100686 *return_value = acpi_driver_data(d);
Rafa³ Bilskidadb49d2006-07-03 07:19:05 +0200687 return 1;
688}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700689
Rafa³ Bilski179da8e2006-08-08 19:12:20 +0200690/* VIA don't support PM2 reg, but have something similar */
691static int enable_arbiter_disable(void)
692{
693 struct pci_dev *dev;
Rafał Bilski73e107d2007-05-28 21:56:19 +0200694 int status = 1;
rafalbilski@interia.pl7f1be892006-09-24 20:28:13 +0200695 int reg;
Rafa³ Bilski179da8e2006-08-08 19:12:20 +0200696 u8 pci_cmd;
697
698 /* Find PLE133 host bridge */
rafalbilski@interia.pl7f1be892006-09-24 20:28:13 +0200699 reg = 0x78;
Rafał Bilskifb48e152007-03-02 20:12:27 +0100700 dev = pci_get_device(PCI_VENDOR_ID_VIA, PCI_DEVICE_ID_VIA_8601_0,
701 NULL);
Linus Torvalds4d5709a2007-10-12 15:42:01 -0700702 /* Find PM133/VT8605 host bridge */
703 if (dev == NULL)
704 dev = pci_get_device(PCI_VENDOR_ID_VIA,
705 PCI_DEVICE_ID_VIA_8605_0, NULL);
rafalbilski@interia.pl7f1be892006-09-24 20:28:13 +0200706 /* Find CLE266 host bridge */
707 if (dev == NULL) {
rafalbilski@interia.pl7f1be892006-09-24 20:28:13 +0200708 reg = 0x76;
Rafał Bilskifb48e152007-03-02 20:12:27 +0100709 dev = pci_get_device(PCI_VENDOR_ID_VIA,
710 PCI_DEVICE_ID_VIA_862X_0, NULL);
Rafa³ Bilskidb2fb9d2006-11-30 03:47:41 +0100711 /* Find CN400 V-Link host bridge */
712 if (dev == NULL)
Rafał Bilskifb48e152007-03-02 20:12:27 +0100713 dev = pci_get_device(PCI_VENDOR_ID_VIA, 0x7259, NULL);
rafalbilski@interia.pl7f1be892006-09-24 20:28:13 +0200714 }
Rafa³ Bilski179da8e2006-08-08 19:12:20 +0200715 if (dev != NULL) {
716 /* Enable access to port 0x22 */
rafalbilski@interia.pl7f1be892006-09-24 20:28:13 +0200717 pci_read_config_byte(dev, reg, &pci_cmd);
Rafa³ Bilski786f46b2007-02-04 18:43:12 +0100718 if (!(pci_cmd & 1<<7)) {
Rafa³ Bilski179da8e2006-08-08 19:12:20 +0200719 pci_cmd |= 1<<7;
rafalbilski@interia.pl7f1be892006-09-24 20:28:13 +0200720 pci_write_config_byte(dev, reg, pci_cmd);
Rafa³ Bilski786f46b2007-02-04 18:43:12 +0100721 pci_read_config_byte(dev, reg, &pci_cmd);
722 if (!(pci_cmd & 1<<7)) {
723 printk(KERN_ERR PFX
724 "Can't enable access to port 0x22.\n");
Rafał Bilskifb48e152007-03-02 20:12:27 +0100725 status = 0;
Rafa³ Bilski786f46b2007-02-04 18:43:12 +0100726 }
Rafa³ Bilski179da8e2006-08-08 19:12:20 +0200727 }
Rafał Bilskifb48e152007-03-02 20:12:27 +0100728 pci_dev_put(dev);
729 return status;
Rafa³ Bilski179da8e2006-08-08 19:12:20 +0200730 }
731 return 0;
732}
733
Rafał Bilski7d5edcc2007-05-17 22:33:46 +0200734static int longhaul_setup_southbridge(void)
Rafa³ Bilski786f46b2007-02-04 18:43:12 +0100735{
736 struct pci_dev *dev;
737 u8 pci_cmd;
738
739 /* Find VT8235 southbridge */
Rafał Bilskifb48e152007-03-02 20:12:27 +0100740 dev = pci_get_device(PCI_VENDOR_ID_VIA, PCI_DEVICE_ID_VIA_8235, NULL);
Rafał Bilski920dd0f2007-05-17 22:35:29 +0200741 if (dev == NULL)
Dave Jonesac617bd2009-01-17 23:29:53 -0500742 /* Find VT8237 southbridge */
Rafał Bilski920dd0f2007-05-17 22:35:29 +0200743 dev = pci_get_device(PCI_VENDOR_ID_VIA,
744 PCI_DEVICE_ID_VIA_8237, NULL);
Rafa³ Bilski786f46b2007-02-04 18:43:12 +0100745 if (dev != NULL) {
746 /* Set transition time to max */
747 pci_read_config_byte(dev, 0xec, &pci_cmd);
748 pci_cmd &= ~(1 << 2);
749 pci_write_config_byte(dev, 0xec, pci_cmd);
750 pci_read_config_byte(dev, 0xe4, &pci_cmd);
751 pci_cmd &= ~(1 << 7);
752 pci_write_config_byte(dev, 0xe4, pci_cmd);
753 pci_read_config_byte(dev, 0xe5, &pci_cmd);
754 pci_cmd |= 1 << 7;
755 pci_write_config_byte(dev, 0xe5, pci_cmd);
Rafał Bilski275bc6b2007-06-05 22:08:50 +0200756 /* Get address of ACPI registers block*/
757 pci_read_config_byte(dev, 0x81, &pci_cmd);
758 if (pci_cmd & 1 << 7) {
759 pci_read_config_dword(dev, 0x88, &acpi_regs_addr);
760 acpi_regs_addr &= 0xff00;
Dave Jonesac617bd2009-01-17 23:29:53 -0500761 printk(KERN_INFO PFX "ACPI I/O at 0x%x\n",
762 acpi_regs_addr);
Rafał Bilski275bc6b2007-06-05 22:08:50 +0200763 }
764
Rafał Bilskifb48e152007-03-02 20:12:27 +0100765 pci_dev_put(dev);
Rafa³ Bilski786f46b2007-02-04 18:43:12 +0100766 return 1;
767 }
768 return 0;
769}
770
Paul Gortmaker27609842013-06-19 13:54:04 -0400771static int longhaul_cpu_init(struct cpufreq_policy *policy)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700772{
Mike Travis92cb7612007-10-19 20:35:04 +0200773 struct cpuinfo_x86 *c = &cpu_data(0);
Dave Jonesac617bd2009-01-17 23:29:53 -0500774 char *cpuname = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700775 int ret;
Rafa³ Bilski2b8c0e12007-02-14 22:00:37 +0100776 u32 lo, hi;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700777
Rafa³ Bilski179da8e2006-08-08 19:12:20 +0200778 /* Check what we have on this motherboard */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700779 switch (c->x86_model) {
780 case 6:
781 cpu_model = CPU_SAMUEL;
782 cpuname = "C3 'Samuel' [C5A]";
783 longhaul_version = TYPE_LONGHAUL_V1;
Dave Jonesac617bd2009-01-17 23:29:53 -0500784 memcpy(mults, samuel1_mults, sizeof(samuel1_mults));
785 memcpy(eblcr, samuel1_eblcr, sizeof(samuel1_eblcr));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700786 break;
787
788 case 7:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700789 switch (c->x86_mask) {
790 case 0:
Rafa³ Bilski2b8c0e12007-02-14 22:00:37 +0100791 longhaul_version = TYPE_LONGHAUL_V1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700792 cpu_model = CPU_SAMUEL2;
793 cpuname = "C3 'Samuel 2' [C5B]";
Rafa³ Bilski2b8c0e12007-02-14 22:00:37 +0100794 /* Note, this is not a typo, early Samuel2's had
795 * Samuel1 ratios. */
Dave Jonesac617bd2009-01-17 23:29:53 -0500796 memcpy(mults, samuel1_mults, sizeof(samuel1_mults));
797 memcpy(eblcr, samuel2_eblcr, sizeof(samuel2_eblcr));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700798 break;
799 case 1 ... 15:
Krzysztof Heltf7f3cad2009-10-24 17:25:38 +0200800 longhaul_version = TYPE_LONGHAUL_V2;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700801 if (c->x86_mask < 8) {
802 cpu_model = CPU_SAMUEL2;
803 cpuname = "C3 'Samuel 2' [C5B]";
804 } else {
805 cpu_model = CPU_EZRA;
806 cpuname = "C3 'Ezra' [C5C]";
807 }
Dave Jonesac617bd2009-01-17 23:29:53 -0500808 memcpy(mults, ezra_mults, sizeof(ezra_mults));
809 memcpy(eblcr, ezra_eblcr, sizeof(ezra_eblcr));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700810 break;
811 }
812 break;
813
814 case 8:
815 cpu_model = CPU_EZRA_T;
816 cpuname = "C3 'Ezra-T' [C5M]";
817 longhaul_version = TYPE_POWERSAVER;
Dave Jonesac617bd2009-01-17 23:29:53 -0500818 numscales = 32;
819 memcpy(mults, ezrat_mults, sizeof(ezrat_mults));
820 memcpy(eblcr, ezrat_eblcr, sizeof(ezrat_eblcr));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700821 break;
822
823 case 9:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700824 longhaul_version = TYPE_POWERSAVER;
Rafa³ Bilski0d44b2b2007-01-31 23:50:49 +0100825 numscales = 32;
Dave Jonesac617bd2009-01-17 23:29:53 -0500826 memcpy(mults, nehemiah_mults, sizeof(nehemiah_mults));
827 memcpy(eblcr, nehemiah_eblcr, sizeof(nehemiah_eblcr));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700828 switch (c->x86_mask) {
829 case 0 ... 1:
Rafa³ Bilski980342a2007-01-31 23:42:47 +0100830 cpu_model = CPU_NEHEMIAH;
Rafa³ Bilskie57501c2007-02-08 23:12:02 +0100831 cpuname = "C3 'Nehemiah A' [C5XLOE]";
Linus Torvalds1da177e2005-04-16 15:20:36 -0700832 break;
833 case 2 ... 4:
Rafa³ Bilski980342a2007-01-31 23:42:47 +0100834 cpu_model = CPU_NEHEMIAH;
Rafa³ Bilskie57501c2007-02-08 23:12:02 +0100835 cpuname = "C3 'Nehemiah B' [C5XLOH]";
Linus Torvalds1da177e2005-04-16 15:20:36 -0700836 break;
837 case 5 ... 15:
Rafa³ Bilski980342a2007-01-31 23:42:47 +0100838 cpu_model = CPU_NEHEMIAH_C;
Rafa³ Bilskie57501c2007-02-08 23:12:02 +0100839 cpuname = "C3 'Nehemiah C' [C5P]";
Linus Torvalds1da177e2005-04-16 15:20:36 -0700840 break;
841 }
842 break;
843
844 default:
845 cpuname = "Unknown";
846 break;
847 }
Rafa³ Bilski2b8c0e12007-02-14 22:00:37 +0100848 /* Check Longhaul ver. 2 */
849 if (longhaul_version == TYPE_LONGHAUL_V2) {
850 rdmsr(MSR_VIA_LONGHAUL, lo, hi);
851 if (lo == 0 && hi == 0)
852 /* Looks like MSR isn't present */
853 longhaul_version = TYPE_LONGHAUL_V1;
854 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700855
Dave Jonesac617bd2009-01-17 23:29:53 -0500856 printk(KERN_INFO PFX "VIA %s CPU detected. ", cpuname);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700857 switch (longhaul_version) {
858 case TYPE_LONGHAUL_V1:
859 case TYPE_LONGHAUL_V2:
Dave Jonesac617bd2009-01-17 23:29:53 -0500860 printk(KERN_CONT "Longhaul v%d supported.\n", longhaul_version);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700861 break;
862 case TYPE_POWERSAVER:
Dave Jonesac617bd2009-01-17 23:29:53 -0500863 printk(KERN_CONT "Powersaver supported.\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700864 break;
865 };
866
Rafa³ Bilski786f46b2007-02-04 18:43:12 +0100867 /* Doesn't hurt */
Rafał Bilski7d5edcc2007-05-17 22:33:46 +0200868 longhaul_setup_southbridge();
Rafa³ Bilski786f46b2007-02-04 18:43:12 +0100869
Rafa³ Bilski179da8e2006-08-08 19:12:20 +0200870 /* Find ACPI data for processor */
Rafa³ Bilski786f46b2007-02-04 18:43:12 +0100871 acpi_walk_namespace(ACPI_TYPE_PROCESSOR, ACPI_ROOT_OBJECT,
Lin Ming22635762009-11-13 10:06:08 +0800872 ACPI_UINT32_MAX, &longhaul_walk_callback, NULL,
Rafa³ Bilski786f46b2007-02-04 18:43:12 +0100873 NULL, (void *)&pr);
Rafa³ Bilski179da8e2006-08-08 19:12:20 +0200874
Rafa³ Bilski264166e2006-12-24 14:04:23 +0100875 /* Check ACPI support for C3 state */
Dave Jones7ab77e02007-04-20 15:58:00 -0400876 if (pr != NULL && longhaul_version == TYPE_POWERSAVER) {
Rafa³ Bilski179da8e2006-08-08 19:12:20 +0200877 cx = &pr->power.states[ACPI_STATE_C3];
Rafał Bilski7d5edcc2007-05-17 22:33:46 +0200878 if (cx->address > 0 && cx->latency <= 1000)
Rafa³ Bilski264166e2006-12-24 14:04:23 +0100879 longhaul_flags |= USE_ACPI_C3;
Rafa³ Bilski179da8e2006-08-08 19:12:20 +0200880 }
Rafał Bilski905497c2007-07-08 21:51:26 +0200881 /* Disable if it isn't working */
882 if (disable_acpi_c3)
883 longhaul_flags &= ~USE_ACPI_C3;
Rafa³ Bilski264166e2006-12-24 14:04:23 +0100884 /* Check if northbridge is friendly */
Rafał Bilski7d5edcc2007-05-17 22:33:46 +0200885 if (enable_arbiter_disable())
Rafa³ Bilski264166e2006-12-24 14:04:23 +0100886 longhaul_flags |= USE_NORTHBRIDGE;
Rafał Bilski7d5edcc2007-05-17 22:33:46 +0200887
Rafa³ Bilski264166e2006-12-24 14:04:23 +0100888 /* Check ACPI support for bus master arbiter disable */
Rafał Bilski7d5edcc2007-05-17 22:33:46 +0200889 if (!(longhaul_flags & USE_ACPI_C3
890 || longhaul_flags & USE_NORTHBRIDGE)
891 && ((pr == NULL) || !(pr->flags.bm_control))) {
Rafa³ Bilski264166e2006-12-24 14:04:23 +0100892 printk(KERN_ERR PFX
893 "No ACPI support. Unsupported northbridge.\n");
894 return -ENODEV;
895 }
896
Rafa³ Bilski786f46b2007-02-04 18:43:12 +0100897 if (longhaul_flags & USE_NORTHBRIDGE)
Rafał Bilski7d5edcc2007-05-17 22:33:46 +0200898 printk(KERN_INFO PFX "Using northbridge support.\n");
899 if (longhaul_flags & USE_ACPI_C3)
900 printk(KERN_INFO PFX "Using ACPI support.\n");
Rafa³ Bilski179da8e2006-08-08 19:12:20 +0200901
Linus Torvalds1da177e2005-04-16 15:20:36 -0700902 ret = longhaul_get_ranges();
903 if (ret != 0)
904 return ret;
905
Rafa³ Bilski786f46b2007-02-04 18:43:12 +0100906 if ((longhaul_version != TYPE_LONGHAUL_V1) && (scale_voltage != 0))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700907 longhaul_setup_voltagescaling();
908
Dave Jones6778bae2005-05-31 19:03:51 -0700909 policy->cpuinfo.transition_latency = 200000; /* nsec */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700910
Viresh Kumar30aa5342013-09-16 18:56:20 +0530911 return cpufreq_table_validate_and_show(policy, longhaul_table);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700912}
913
Linus Torvalds221dee22007-02-26 14:55:48 -0800914static struct cpufreq_driver longhaul_driver = {
Viresh Kumar3a4d0342013-10-03 20:28:10 +0530915 .verify = cpufreq_generic_frequency_table_verify,
Viresh Kumar9c0ebcf2013-10-25 19:45:48 +0530916 .target_index = longhaul_target,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700917 .get = longhaul_get,
918 .init = longhaul_cpu_init,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700919 .name = "longhaul",
Viresh Kumar3a4d0342013-10-03 20:28:10 +0530920 .attr = cpufreq_generic_attr,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700921};
922
Andi Kleenfa8031a2012-01-26 00:09:12 +0100923static const struct x86_cpu_id longhaul_id[] = {
924 { X86_VENDOR_CENTAUR, 6 },
925 {}
926};
927MODULE_DEVICE_TABLE(x86cpu, longhaul_id);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700928
929static int __init longhaul_init(void)
930{
Mike Travis92cb7612007-10-19 20:35:04 +0200931 struct cpuinfo_x86 *c = &cpu_data(0);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700932
Andi Kleenfa8031a2012-01-26 00:09:12 +0100933 if (!x86_match_cpu(longhaul_id))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700934 return -ENODEV;
935
Rafał Bilskib5811bc2012-12-15 00:45:02 +0100936 if (!enable) {
937 printk(KERN_ERR PFX "Option \"enable\" not set. Aborting.\n");
938 return -ENODEV;
939 }
Rafa³ Bilski48b7bde2006-07-04 17:50:57 +0200940#ifdef CONFIG_SMP
941 if (num_online_cpus() > 1) {
Dave Jonesac617bd2009-01-17 23:29:53 -0500942 printk(KERN_ERR PFX "More than 1 CPU detected, "
943 "longhaul disabled.\n");
Dave Jones1cfe2012006-12-28 22:30:16 -0500944 return -ENODEV;
Rafa³ Bilski48b7bde2006-07-04 17:50:57 +0200945 }
946#endif
947#ifdef CONFIG_X86_IO_APIC
948 if (cpu_has_apic) {
Dave Jonesac617bd2009-01-17 23:29:53 -0500949 printk(KERN_ERR PFX "APIC detected. Longhaul is currently "
950 "broken in this configuration.\n");
Rafa³ Bilski48b7bde2006-07-04 17:50:57 +0200951 return -ENODEV;
952 }
953#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700954 switch (c->x86_model) {
955 case 6 ... 9:
956 return cpufreq_register_driver(&longhaul_driver);
Dave Jones8ec98222006-12-17 19:07:35 -0500957 case 10:
958 printk(KERN_ERR PFX "Use acpi-cpufreq driver for VIA C7\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700959 default:
Fernando Carrijoc19a28e2009-01-07 18:09:08 -0800960 ;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700961 }
962
963 return -ENODEV;
964}
965
966
967static void __exit longhaul_exit(void)
968{
Viresh Kumarb43a7ff2013-03-24 11:56:43 +0530969 struct cpufreq_policy *policy = cpufreq_cpu_get(0);
Dave Jones8eebf1a2006-05-30 17:40:16 -0400970 int i;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700971
Dave Jonesac617bd2009-01-17 23:29:53 -0500972 for (i = 0; i < numscales; i++) {
973 if (mults[i] == maxmult) {
Srivatsa S. Bhat7aa05572014-04-29 00:24:09 +0530974 struct cpufreq_freqs freqs;
975
976 freqs.old = policy->cur;
977 freqs.new = longhaul_table[i].frequency;
978 freqs.flags = 0;
979
980 cpufreq_freq_transition_begin(policy, &freqs);
Viresh Kumarb43a7ff2013-03-24 11:56:43 +0530981 longhaul_setstate(policy, i);
Srivatsa S. Bhat7aa05572014-04-29 00:24:09 +0530982 cpufreq_freq_transition_end(policy, &freqs, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700983 break;
984 }
985 }
986
Viresh Kumarb43a7ff2013-03-24 11:56:43 +0530987 cpufreq_cpu_put(policy);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700988 cpufreq_unregister_driver(&longhaul_driver);
989 kfree(longhaul_table);
990}
991
Rafal Bilski52a26382007-10-07 00:24:32 -0700992/* Even if BIOS is exporting ACPI C3 state, and it is used
993 * with success when CPU is idle, this state doesn't
994 * trigger frequency transition in some cases. */
Dave Jonesac617bd2009-01-17 23:29:53 -0500995module_param(disable_acpi_c3, int, 0644);
Rafał Bilski905497c2007-07-08 21:51:26 +0200996MODULE_PARM_DESC(disable_acpi_c3, "Don't use ACPI C3 support");
Lucas De Marchi0d2eb442011-03-17 16:24:16 -0300997/* Change CPU voltage with frequency. Very useful to save
Rafal Bilski52a26382007-10-07 00:24:32 -0700998 * power, but most VIA C3 processors aren't supporting it. */
Dave Jonesac617bd2009-01-17 23:29:53 -0500999module_param(scale_voltage, int, 0644);
Rafa³ Bilskidb44aaf2006-08-16 01:07:33 +02001000MODULE_PARM_DESC(scale_voltage, "Scale voltage of processor");
Rafal Bilski52a26382007-10-07 00:24:32 -07001001/* Force revision key to 0 for processors which doesn't
1002 * support voltage scaling, but are introducing itself as
1003 * such. */
1004module_param(revid_errata, int, 0644);
1005MODULE_PARM_DESC(revid_errata, "Ignore CPU Revision ID");
Rafał Bilskib5811bc2012-12-15 00:45:02 +01001006/* By default driver is disabled to prevent incompatible
1007 * system freeze. */
1008module_param(enable, int, 0644);
1009MODULE_PARM_DESC(enable, "Enable driver");
Linus Torvalds1da177e2005-04-16 15:20:36 -07001010
Dave Jonesac617bd2009-01-17 23:29:53 -05001011MODULE_AUTHOR("Dave Jones <davej@redhat.com>");
1012MODULE_DESCRIPTION("Longhaul driver for VIA Cyrix processors.");
1013MODULE_LICENSE("GPL");
Linus Torvalds1da177e2005-04-16 15:20:36 -07001014
Rafa³ Bilski0d6daba2006-07-07 08:48:26 +02001015late_initcall(longhaul_init);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001016module_exit(longhaul_exit);