* [PATCH][2.5.32] CPUfreq i386 drivers (3/4)
@ 2002-08-28 11:47 Dominik Brodowski
0 siblings, 0 replies; only message in thread
From: Dominik Brodowski @ 2002-08-28 11:47 UTC (permalink / raw)
To: torvalds; +Cc: cpufreq, linux-kernel
[-- Attachment #1: Type: text/plain, Size: 56173 bytes --]
CPUFreq i386 drivers for 2.5.32:
arch/i386/config.in Necessary config
options
arch/i386/kernel/cpu/Makefile allow for compilation
of the CPUFreq subdirectory
arch/i386/kernel/cpu/cpufreq/Makefile Makefile for CPUFreq drivers
arch/i386/kernel/cpu/cpufreq/elanfreq.c CPUFreq driver for AMD Elan
processors
arch/i386/kernel/cpu/cpufreq/longhaul.c CPUFreq driver for VIA
Longhaul processors
arch/i386/kernel/cpu/cpufreq/powernow-k6.c CPUFreq driver for mobile
AMD K6-2+ and mobile AMD K6-3+ processors
arch/i386/kernel/cpu/cpufreq/speedstep.c CPUFreq drivers for ICH2-M
and ICH3-M chipsets and Intel Pentium 3-M and 4-M processors.
diff -ruN linux-2531orig/arch/i386/config.in linux/arch/i386/config.in
--- linux-2531orig/arch/i386/config.in Wed Aug 28 10:06:00 2002
+++ linux/arch/i386/config.in Wed Aug 28 10:46:27 2002
@@ -173,6 +173,15 @@
dep_bool 'Check for non-fatal errors on Athlon/Duron' CONFIG_X86_MCE_NONFATAL $CONFIG_X86_MCE
dep_bool 'check for P4 thermal throttling interrupt.' CONFIG_X86_MCE_P4THERMAL $CONFIG_X86_MCE $CONFIG_X86_UP_APIC
+bool 'CPU Frequency scaling' CONFIG_CPU_FREQ
+if [ "$CONFIG_CPU_FREQ" != "n" ]; then
+ tristate ' AMD Mobile K6-2/K6-3 PowerNow!' CONFIG_X86_POWERNOW_K6
+ if [ "$CONFIG_MELAN" = "y" ]; then
+ tristate ' AMD Elan' CONFIG_ELAN_CPUFREQ
+ fi
+ tristate ' VIA Cyrix III Longhaul' CONFIG_X86_LONGHAUL
+ tristate ' Intel Speedstep' CONFIG_X86_SPEEDSTEP
+fi
tristate 'Toshiba Laptop support' CONFIG_TOSHIBA
tristate 'Dell laptop support' CONFIG_I8K
diff -ruN linux-2531orig/arch/i386/kernel/cpu/Makefile linux/arch/i386/kernel/cpu/Makefile
--- linux-2531orig/arch/i386/kernel/cpu/Makefile Wed Aug 28 10:06:00 2002
+++ linux/arch/i386/kernel/cpu/Makefile Wed Aug 28 10:49:07 2002
@@ -15,4 +15,10 @@
obj-$(CONFIG_MTRR) += mtrr/
+ifdef CONFIG_CPU_FREQ
+subdir-y += cpufreq
+subdir-m += cpufreq
+obj-y += cpufreq/cpufreq.o
+endif
+
include $(TOPDIR)/Rules.make
diff -ruN linux-2531orig/arch/i386/kernel/cpu/cpufreq/Makefile linux/arch/i386/kernel/cpu/cpufreq/Makefile
--- linux-2531orig/arch/i386/kernel/cpu/cpufreq/Makefile Thu Jan 1 01:00:00 1970
+++ linux/arch/i386/kernel/cpu/cpufreq/Makefile Wed Aug 28 10:52:08 2002
@@ -0,0 +1,8 @@
+O_TARGET := cpufreq.o
+
+obj-$(CONFIG_X86_POWERNOW_K6) += powernow-k6.o
+obj-$(CONFIG_X86_LONGHAUL) += longhaul.o
+obj-$(CONFIG_X86_SPEEDSTEP) += speedstep.o
+obj-$(CONFIG_ELAN_CPUFREQ) += elanfreq.o
+
+include $(TOPDIR)/Rules.make
diff -ruN linux-2531orig/arch/i386/kernel/cpu/cpufreq/elanfreq.c linux/arch/i386/kernel/cpu/cpufreq/elanfreq.c
--- linux-2531orig/arch/i386/kernel/cpu/cpufreq/elanfreq.c Thu Jan 1 01:00:00 1970
+++ linux/arch/i386/kernel/cpu/cpufreq/elanfreq.c Wed Aug 28 10:51:46 2002
@@ -0,0 +1,257 @@
+/*
+ * elanfreq: cpufreq driver for the AMD ELAN family
+ *
+ * (c) Copyright 2002 Robert Schwebel <r.schwebel@pengutronix.de>
+ *
+ * Parts of this code are (c) Sven Geggus <sven@geggus.net>
+ *
+ * All Rights Reserved.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version
+ * 2 of the License, or (at your option) any later version.
+ *
+ * 2002-02-13: - initial revision for 2.4.18-pre9 by Robert Schwebel
+ *
+ */
+
+#include <linux/module.h>
+#include <linux/config.h>
+#include <linux/kernel.h>
+#include <linux/slab.h>
+
+#include <linux/cpufreq.h>
+
+#include <linux/sched.h>
+#include <linux/init.h>
+#include <asm/msr.h>
+#include <asm/timex.h>
+#include <asm/io.h>
+#include <linux/delay.h>
+
+#define REG_CSCIR 0x22 /* Chip Setup and Control Index Register */
+#define REG_CSCDR 0x23 /* Chip Setup and Control Data Register */
+
+#define SAFE_FREQ 33000 /* every Elan CPU can run at 33 MHz */
+
+static int currentspeed; /* current frequency in kHz */
+static struct cpufreq_driver *elanfreq_driver;
+
+MODULE_LICENSE("GPL");
+
+MODULE_AUTHOR(
+ "Robert Schwebel <r.schwebel@pengutronix.de>, Sven Geggus <sven@geggus.net>"
+);
+MODULE_DESCRIPTION("cpufreq driver for AMD's Elan CPUs");
+
+struct s_elan_multiplier {
+ int clock; /* frequency in kHz */
+ int val40h; /* PMU Force Mode register */
+ int val80h; /* CPU Clock Speed Register */
+};
+
+/*
+ * It is important that the frequencies
+ * are listed in ascending order here!
+ */
+struct s_elan_multiplier elan_multiplier[] = {
+ {1000, 0x02, 0x18},
+ {2000, 0x02, 0x10},
+ {4000, 0x02, 0x08},
+ {8000, 0x00, 0x00},
+ {16000, 0x00, 0x02},
+ {33000, 0x00, 0x04},
+ {66000, 0x01, 0x04},
+ {99000, 0x01, 0x05}
+};
+
+
+/**
+ * elanfreq_get_cpu_frequency: determine current cpu speed
+ *
+ * Finds out at which frequency the CPU of the Elan SOC runs
+ * at the moment. Frequencies from 1 to 33 MHz are generated
+ * the normal way, 66 and 99 MHz are called "Hyperspeed Mode"
+ * and have the rest of the chip running with 33 MHz.
+ */
+
+static unsigned int elanfreq_get_cpu_frequency(void)
+{
+ u8 clockspeed_reg; /* Clock Speed Register */
+
+ cli();
+ outb_p(0x80,REG_CSCIR);
+ clockspeed_reg = inb_p(REG_CSCDR);
+ sti();
+
+ if ((clockspeed_reg & 0xE0) == 0xE0) { return 0; }
+
+ /* Are we in CPU clock multiplied mode (66/99 MHz)? */
+ if ((clockspeed_reg & 0xE0) == 0xC0) {
+ if ((clockspeed_reg & 0x01) == 0) {
+ return 66000;
+ } else {
+ return 99000;
+ }
+ }
+
+ /* 33 MHz is not 32 MHz... */
+ if ((clockspeed_reg & 0xE0)==0xA0)
+ return 33000;
+
+ return ((1<<((clockspeed_reg & 0xE0) >> 5)) * 1000);
+}
+
+
+/**
+ * elanfreq_set_cpu_frequency: Change the CPU core frequency
+ * @cpu: cpu number
+ * @freq: frequency in kHz
+ *
+ * This function takes a frequency value and changes the CPU frequency
+ * according to this. Note that the frequency has to be checked by
+ * elanfreq_validatespeed() for correctness!
+ *
+ * There is no return value.
+ */
+
+static void elanfreq_set_cpu_frequency (unsigned int cpu, unsigned int freq) {
+
+ int i;
+
+ if (cpu && (cpu != CPUFREQ_ALL_CPUS))
+ return;
+
+ printk(KERN_INFO "elanfreq: attempting to set frequency to %i kHz\n",freq);
+
+ /* search table entry for given Mhz value */
+ for (i=0; i<(sizeof(elan_multiplier)/sizeof(struct s_elan_multiplier)); i++)
+ {
+ if (elan_multiplier[i].clock==freq) break;
+ }
+
+ /* XXX Shouldn't we have a sanity check here or can we rely on
+ the frequency having been checked before ??? */
+
+ /*
+ * Access to the Elan's internal registers is indexed via
+ * 0x22: Chip Setup & Control Register Index Register (CSCI)
+ * 0x23: Chip Setup & Control Register Data Register (CSCD)
+ *
+ */
+
+ /*
+ * 0x40 is the Power Management Unit's Force Mode Register.
+ * Bit 6 enables Hyperspeed Mode (66/100 MHz core frequency)
+ */
+
+ cli();
+ outb_p(0x40,REG_CSCIR); /* Disable hyperspeed mode */
+ outb_p(0x00,REG_CSCDR);
+ sti(); /* wait till internal pipelines and */
+ udelay(1000); /* buffers have cleaned up */
+
+ cli();
+
+ /* now, set the CPU clock speed register (0x80) */
+ outb_p(0x80,REG_CSCIR);
+ outb_p(elan_multiplier[i].val80h,REG_CSCDR);
+
+ /* now, the hyperspeed bit in PMU Force Mode Register (0x40) */
+ outb_p(0x40,REG_CSCIR);
+ outb_p(elan_multiplier[i].val40h,REG_CSCDR);
+ udelay(10000);
+ sti();
+
+ currentspeed=freq;
+
+};
+
+
+/**
+ * elanfreq_validatespeed: test if frequency is valid
+ * @cpu: cpu number
+ * @freq: frequency in kHz
+ *
+ * This function checks if a given frequency in kHz is valid for the
+ * hardware supported by the driver. It returns a "best fit" frequency
+ * which might be different from the given one.
+ */
+
+static unsigned int elanfreq_validatespeed (unsigned int cpu, unsigned int freq)
+{
+ unsigned int best = 0;
+ int i;
+
+ if (cpu && (cpu != CPUFREQ_ALL_CPUS))
+ return 0;
+
+ for (i=(sizeof(elan_multiplier)/sizeof(struct s_elan_multiplier) - 1); i>=0; i++)
+ {
+ if (freq < elan_multiplier[i].clock)
+ {
+ best = elan_multiplier[i].clock;
+
+ }
+ }
+
+ return best;
+}
+
+
+
+/*
+ * Module init and exit code
+ */
+
+static int __init elanfreq_init(void)
+{
+ struct cpuinfo_x86 *c = cpu_data;
+ struct cpufreq_driver *driver;
+ int ret;
+
+ /* Test if we have the right hardware */
+ if ((c->x86_vendor != X86_VENDOR_AMD) ||
+ (c->x86 != 4) || (c->x86_model!=10))
+ {
+ printk(KERN_INFO "elanfreq: error: no Elan processor found!\n");
+ return -ENODEV;
+ }
+
+ driver = kmalloc(sizeof(struct cpufreq_driver) +
+ sizeof(struct cpufreq_freqs), GFP_KERNEL);
+ if (!driver)
+ return -ENOMEM;
+
+ driver->freq = (struct cpufreq_freqs*) (driver + sizeof(struct cpufreq_driver));
+
+ driver->sync = CPUFREQ_SYNC;
+ driver->freq->cpu = CPUFREQ_ALL_CPUS;
+ driver->freq->cur = elanfreq_get_cpu_frequency();
+ driver->validate = &elanfreq_validatespeed;
+ driver->setspeed = &elanfreq_set_cpu_frequency;
+
+ ret = cpufreq_register(driver);
+ if (ret) {
+ kfree(driver);
+ return ret;
+ }
+
+ elanfreq_driver = driver;
+
+ return 0;
+}
+
+
+static void __exit elanfreq_exit(void)
+{
+ if (elanfreq_driver) {
+ cpufreq_unregister();
+ kfree(elanfreq_driver);
+ }
+}
+
+module_init(elanfreq_init);
+module_exit(elanfreq_exit);
+
diff -ruN linux-2531orig/arch/i386/kernel/cpu/cpufreq/longhaul.c linux/arch/i386/kernel/cpu/cpufreq/longhaul.c
--- linux-2531orig/arch/i386/kernel/cpu/cpufreq/longhaul.c Thu Jan 1 01:00:00 1970
+++ linux/arch/i386/kernel/cpu/cpufreq/longhaul.c Wed Aug 28 10:51:46 2002
@@ -0,0 +1,700 @@
+/*
+ * $Id: longhaul.c,v 1.66 2002/08/28 10:59:46 db Exp $
+ *
+ * (C) 2001 Dave Jones. <davej@suse.de>
+ * (C) 2002 Padraig Brady. <padraig@antefacto.com>
+ *
+ * Licensed under the terms of the GNU GPL License version 2.
+ * Based upon datasheets & sample CPUs kindly provided by VIA.
+ *
+ * VIA have currently 3 different versions of Longhaul.
+ *
+ * +---------------------+----------+---------------------------------+
+ * | Marketing name | Codename | longhaul version / features. |
+ * +---------------------+----------+---------------------------------+
+ * | Samuel/CyrixIII | C5A | v1 : multipliers only |
+ * | Samuel2/C3 | C3E/C5B | v1 : multiplier only |
+ * | Ezra | C5C | v2 : multipliers & voltage |
+ * | Ezra-T | C5M/C5N | v3 : multipliers, voltage & FSB |
+ * +---------------------+----------+---------------------------------+
+ *
+ * BIG FAT DISCLAIMER: Work in progress code. Possibly *dangerous*
+ */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/sched.h>
+#include <linux/init.h>
+#include <linux/delay.h>
+#include <linux/proc_fs.h>
+#include <linux/cpufreq.h>
+#include <linux/slab.h>
+
+#include <asm/msr.h>
+#include <asm/timex.h>
+#include <asm/io.h>
+
+#define DEBUG
+
+#ifdef DEBUG
+#define dprintk(msg...) printk(msg)
+#else
+#define dprintk(msg...) do { } while(0);
+#endif
+
+static int numscales=16, numvscales;
+static int minvid, maxvid;
+static int can_scale_voltage;
+static int can_scale_fsb;
+static int vrmrev;
+
+
+/* Module parameters */
+static int dont_scale_voltage;
+static int dont_scale_fsb;
+static int current_fsb;
+static int favour_fast_fsb;
+
+#define __hlt() __asm__ __volatile__("hlt": : :"memory")
+
+/*
+ * Clock ratio tables.
+ * The eblcr ones specify the ratio read from the CPU.
+ * The clock_ratio ones specify what to write to the CPU.
+ */
+
+/* VIA C3 Samuel 1 & Samuel 2 (stepping 0)*/
+static int __initdata longhaul1_clock_ratio[16] = {
+ -1, /* 0000 -> RESERVED */
+ 30, /* 0001 -> 3.0x */
+ 40, /* 0010 -> 4.0x */
+ -1, /* 0011 -> RESERVED */
+ -1, /* 0100 -> RESERVED */
+ 35, /* 0101 -> 3.5x */
+ 45, /* 0110 -> 4.5x */
+ 55, /* 0111 -> 5.5x */
+ 60, /* 1000 -> 6.0x */
+ 70, /* 1001 -> 7.0x */
+ 80, /* 1010 -> 8.0x */
+ 50, /* 1011 -> 5.0x */
+ 65, /* 1100 -> 6.5x */
+ 75, /* 1101 -> 7.5x */
+ -1, /* 1110 -> RESERVED */
+ -1, /* 1111 -> RESERVED */
+};
+
+static int __initdata samuel1_eblcr[16] = {
+ 50, /* 0000 -> RESERVED */
+ 30, /* 0001 -> 3.0x */
+ 40, /* 0010 -> 4.0x */
+ -1, /* 0011 -> RESERVED */
+ 55, /* 0100 -> 5.5x */
+ 35, /* 0101 -> 3.5x */
+ 45, /* 0110 -> 4.5x */
+ -1, /* 0111 -> RESERVED */
+ -1, /* 1000 -> RESERVED */
+ 70, /* 1001 -> 7.0x */
+ 80, /* 1010 -> 8.0x */
+ 60, /* 1011 -> 6.0x */
+ -1, /* 1100 -> RESERVED */
+ 75, /* 1101 -> 7.5x */
+ -1, /* 1110 -> RESERVED */
+ 65, /* 1111 -> 6.5x */
+};
+
+/* VIA C3 Samuel2 Stepping 1->15 & VIA C3 Ezra */
+static int __initdata longhaul2_clock_ratio[16] = {
+ 100, /* 0000 -> 10.0x */
+ 30, /* 0001 -> 3.0x */
+ 40, /* 0010 -> 4.0x */
+ 90, /* 0011 -> 9.0x */
+ 95, /* 0100 -> 9.5x */
+ 35, /* 0101 -> 3.5x */
+ 45, /* 0110 -> 4.5x */
+ 55, /* 0111 -> 5.5x */
+ 60, /* 1000 -> 6.0x */
+ 70, /* 1001 -> 7.0x */
+ 80, /* 1010 -> 8.0x */
+ 50, /* 1011 -> 5.0x */
+ 65, /* 1100 -> 6.5x */
+ 75, /* 1101 -> 7.5x */
+ 85, /* 1110 -> 8.5x */
+ 120, /* 1111 -> 12.0x */
+};
+
+static int __initdata samuel2_eblcr[16] = {
+ 50, /* 0000 -> 5.0x */
+ 30, /* 0001 -> 3.0x */
+ 40, /* 0010 -> 4.0x */
+ 100, /* 0011 -> 10.0x */
+ 55, /* 0100 -> 5.5x */
+ 35, /* 0101 -> 3.5x */
+ 45, /* 0110 -> 4.5x */
+ 110, /* 0111 -> 11.0x */
+ 90, /* 1000 -> 9.0x */
+ 70, /* 1001 -> 7.0x */
+ 80, /* 1010 -> 8.0x */
+ 60, /* 1011 -> 6.0x */
+ 120, /* 1100 -> 12.0x */
+ 75, /* 1101 -> 7.5x */
+ 130, /* 1110 -> 13.0x */
+ 65, /* 1111 -> 6.5x */
+};
+
+static int __initdata ezra_eblcr[16] = {
+ 50, /* 0000 -> 5.0x */
+ 30, /* 0001 -> 3.0x */
+ 40, /* 0010 -> 4.0x */
+ 100, /* 0011 -> 10.0x */
+ 55, /* 0100 -> 5.5x */
+ 35, /* 0101 -> 3.5x */
+ 45, /* 0110 -> 4.5x */
+ 95, /* 0111 -> 9.5x */
+ 90, /* 1000 -> 9.0x */
+ 70, /* 1001 -> 7.0x */
+ 80, /* 1010 -> 8.0x */
+ 60, /* 1011 -> 6.0x */
+ 120, /* 1100 -> 12.0x */
+ 75, /* 1101 -> 7.5x */
+ 85, /* 1110 -> 8.5x */
+ 65, /* 1111 -> 6.5x */
+};
+
+/* VIA C5M. */
+static int __initdata longhaul3_clock_ratio[32] = {
+ 100, /* 0000 -> 10.0x */
+ 30, /* 0001 -> 3.0x */
+ 40, /* 0010 -> 4.0x */
+ 90, /* 0011 -> 9.0x */
+ 95, /* 0100 -> 9.5x */
+ 35, /* 0101 -> 3.5x */
+ 45, /* 0110 -> 4.5x */
+ 55, /* 0111 -> 5.5x */
+ 60, /* 1000 -> 6.0x */
+ 70, /* 1001 -> 7.0x */
+ 80, /* 1010 -> 8.0x */
+ 50, /* 1011 -> 5.0x */
+ 65, /* 1100 -> 6.5x */
+ 75, /* 1101 -> 7.5x */
+ 85, /* 1110 -> 8.5x */
+ 120, /* 1111 -> 12.0x */
+
+ -1, /* 0000 -> RESERVED (10.0x) */
+ 110, /* 0001 -> 11.0x */
+ 120, /* 0010 -> 12.0x */
+ -1, /* 0011 -> RESERVED (9.0x)*/
+ 105, /* 0100 -> 10.5x */
+ 115, /* 0101 -> 11.5x */
+ 125, /* 0110 -> 12.5x */
+ 135, /* 0111 -> 13.5x */
+ 140, /* 1000 -> 14.0x */
+ 150, /* 1001 -> 15.0x */
+ 160, /* 1010 -> 16.0x */
+ 130, /* 1011 -> 13.0x */
+ 145, /* 1100 -> 14.5x */
+ 155, /* 1101 -> 15.5x */
+ -1, /* 1110 -> RESERVED (13.0x) */
+ -1, /* 1111 -> RESERVED (12.0x) */
+};
+
+static int __initdata c5m_eblcr[32] = {
+ 50, /* 0000 -> 5.0x */
+ 30, /* 0001 -> 3.0x */
+ 40, /* 0010 -> 4.0x */
+ 100, /* 0011 -> 10.0x */
+ 55, /* 0100 -> 5.5x */
+ 35, /* 0101 -> 3.5x */
+ 45, /* 0110 -> 4.5x */
+ 95, /* 0111 -> 9.5x */
+ 90, /* 1000 -> 9.0x */
+ 70, /* 1001 -> 7.0x */
+ 80, /* 1010 -> 8.0x */
+ 60, /* 1011 -> 6.0x */
+ 120, /* 1100 -> 12.0x */
+ 75, /* 1101 -> 7.5x */
+ 85, /* 1110 -> 8.5x */
+ 65, /* 1111 -> 6.5x */
+
+ -1, /* 0000 -> RESERVED (9.0x) */
+ 110, /* 0001 -> 11.0x */
+ 120, /* 0010 -> 12.0x */
+ -1, /* 0011 -> RESERVED (10.0x)*/
+ 135, /* 0100 -> 13.5x */
+ 115, /* 0101 -> 11.5x */
+ 125, /* 0110 -> 12.5x */
+ 105, /* 0111 -> 10.5x */
+ 130, /* 1000 -> 13.0x */
+ 150, /* 1001 -> 15.0x */
+ 160, /* 1010 -> 16.0x */
+ 140, /* 1011 -> 14.0x */
+ -1, /* 1100 -> RESERVED (12.0x) */
+ 155, /* 1101 -> 15.5x */
+ -1, /* 1110 -> RESERVED (13.0x) */
+ 145, /* 1111 -> 14.5x */
+};
+
+/* fsb values as defined in CPU */
+static unsigned int eblcr_fsb_table[] = { 66, 133, 100, -1 };
+/* fsb values to favour low fsb speed (lower power) */
+static unsigned int power_fsb_table[] = { 66, 100, 133, -1 };
+/* fsb values to favour high fsb speed (for e.g. if lowering CPU
+ freq because of heat, but want to maintain highest performance possible) */
+static unsigned int perf_fsb_table[] = { 133, 100, 66, -1 };
+static unsigned int *fsb_search_table;
+
+/* Voltage scales. Div by 1000 to get actual voltage. */
+static int __initdata vrm85scales[32] = {
+ 1250, 1200, 1150, 1100, 1050, 1800, 1750, 1700,
+ 1650, 1600, 1550, 1500, 1450, 1400, 1350, 1300,
+ 1275, 1225, 1175, 1125, 1075, 1825, 1775, 1725,
+ 1675, 1625, 1575, 1525, 1475, 1425, 1375, 1325,
+};
+
+static int __initdata mobilevrmscales[32] = {
+ 2000, 1950, 1900, 1850, 1800, 1750, 1700, 1650,
+ 1600, 1550, 1500, 1450, 1500, 1350, 1300, -1,
+ 1275, 1250, 1225, 1200, 1175, 1150, 1125, 1100,
+ 1075, 1050, 1025, 1000, 975, 950, 925, -1,
+};
+
+/* Clock ratios multiplied by 10 */
+static int clock_ratio[32];
+static int eblcr_table[32];
+static int voltage_table[32];
+static int highest_speed, lowest_speed; /* kHz */
+static int longhaul; /* version. */
+static struct cpufreq_driver *longhaul_driver;
+
+static unsigned int longhaul_validatespeed_fsb(unsigned int freq, unsigned fsb, unsigned int oldbest)
+{
+ int i;
+ unsigned int newclock;
+ unsigned int best=0;
+
+ best = oldbest;
+
+ /* Find closest MHz match. */
+ for (i=0; i<numscales; i++) {
+ if (clock_ratio[i]==-1) /* skip RESERVED entries */
+ continue;
+
+ newclock = clock_ratio[i] * fsb * 100;
+
+ if ((newclock < best) && (newclock >= freq))
+ if ((newclock>=lowest_speed) && (newclock<=highest_speed))
+ best = newclock;
+ }
+ return best;
+}
+
+/* Determine nearest speed possible for the desired fsb speed */
+static unsigned int longhaul_validatespeed (unsigned int cpu, unsigned int freq)
+{
+ unsigned int best=-1;
+
+ if (cpu && (cpu != CPUFREQ_ALL_CPUS))
+ return 0;
+
+ if (freq<lowest_speed)
+ freq=lowest_speed;
+ if (freq>highest_speed)
+ freq=highest_speed;
+
+ if (can_scale_fsb==1) {
+ int fsb_index;
+ for (fsb_index=0; fsb_search_table[fsb_index]!=-1; fsb_index++)
+ best = longhaul_validatespeed_fsb (freq, fsb_search_table[fsb_index], best);
+ } else {
+ /* Can only scale multiplier. */
+ best = longhaul_validatespeed_fsb (freq, current_fsb, best);
+ }
+
+ return best;
+}
+
+/**
+ * longhaul_set_cpu_frequency()
+ * @cpu: CPU number
+ * @freq: new processor frequency in kHz that has been
+ * validated with longhaul_validatespeed().
+ *
+ * Note this function is only called if a new frequency has been selected.
+ */
+
+static void longhaul_set_cpu_frequency (unsigned int cpu, unsigned int freq)
+{
+ int index;
+ unsigned int bestfsb=-1;
+ unsigned long lo, hi;
+ int bits=-1;
+ int revkey;
+ int vidindex, i;
+
+ if (cpu && (cpu != CPUFREQ_ALL_CPUS))
+ return;
+
+ /* Find out which mult bit-pattern & FSB we want */
+ for (index=0; index<numscales; index++) {
+ if (clock_ratio[index]==-1) /* skip RESERVED entries */
+ continue;
+
+ if (can_scale_fsb==1) {
+ int fsb_index;
+ for (fsb_index=0; fsb_search_table[fsb_index]!=-1; fsb_index++) {
+ if ((clock_ratio[index] * fsb_search_table[fsb_index] * 100) == freq) {
+ bestfsb=fsb_search_table[fsb_index];
+ break;
+ }
+ }
+ } else {
+ /* Can't scale FSB. */
+ bestfsb = current_fsb;
+ if ((clock_ratio[index] * bestfsb * 100) == freq)
+ break;
+ }
+ }
+
+ if (clock_ratio[index]==-1)
+ return;
+
+ dprintk (KERN_INFO "longhaul: New FSB:%d Mult(x10):%d\n",
+ bestfsb, clock_ratio[index]);
+
+ bits = index;
+ /* "bits" contains the bitpattern of the new multiplier.
+ we now need to transform it to the desired format. */
+
+ switch (longhaul) {
+ case 1:
+ rdmsr (MSR_VIA_BCR2, lo, hi);
+ revkey = (lo & 0xf)<<4; /* Rev key. */
+ lo &= ~(1<<23|1<<24|1<<25|1<<26);
+ lo |= (1<<19); /* Enable software clock multiplier */
+ lo |= (bits<<23); /* desired multiplier */
+ lo |= revkey;
+ wrmsr (MSR_VIA_BCR2, lo, hi);
+
+ __hlt();
+
+ /* Disable software clock multiplier */
+ rdmsr (MSR_VIA_BCR2, lo, hi);
+ lo &= ~(1<<19);
+ lo |= revkey;
+ wrmsr (MSR_VIA_BCR2, lo, hi);
+ break;
+
+ case 2:
+ rdmsr (MSR_VIA_LONGHAUL, lo, hi);
+ revkey = (lo & 0xf)<<4; /* Rev key. */
+ lo &= 0xfff0bf0f; /* reset [19:16,14](bus ratio) and [7:4](rev key) to 0 */
+ lo |= (bits<<16);
+ lo |= (1<<8); /* EnableSoftBusRatio */
+ lo |= revkey;
+
+ if (can_scale_voltage) {
+ if (can_scale_fsb==1) {
+ dprintk (KERN_INFO "longhaul: Voltage scaling + FSB scaling not done yet.\n");
+ goto bad_voltage;
+ } else {
+ /* PB: TODO fix this up */
+ vidindex = (((highest_speed-lowest_speed) / (bestfsb/2)) -
+ ((highest_speed-(freq/1000)) / (bestfsb/2)));
+ }
+ for (i=0;i<32;i++) {
+ dprintk (KERN_INFO "VID hunting. Looking for %d, found %d\n",
+ minvid+(vidindex*25), voltage_table[i]);
+ if (voltage_table[i]==(minvid + (vidindex * 25)))
+ break;
+ }
+ if (i==32)
+ goto bad_voltage;
+
+ dprintk (KERN_INFO "longhaul: Desired vid index=%d\n", i);
+#if 0
+ lo &= 0xfe0fffff;/* reset [24:20](voltage) to 0 */
+ lo |= (i<<20); /* set voltage */
+ lo |= (1<<9); /* EnableSoftVID */
+#endif
+ }
+
+bad_voltage:
+ wrmsr (MSR_VIA_LONGHAUL, lo, hi);
+ __hlt();
+
+ rdmsr (MSR_VIA_LONGHAUL, lo, hi);
+ lo &= ~(1<<8);
+ if (can_scale_voltage)
+ lo &= ~(1<<9);
+ lo |= revkey;
+ wrmsr (MSR_VIA_LONGHAUL, lo, hi);
+ break;
+
+ case 3:
+ rdmsr (MSR_VIA_LONGHAUL, lo, hi);
+ revkey = (lo & 0xf)<<4; /* Rev key. */
+ lo &= 0xfff0bf0f; /* reset longhaul[19:16,14] to 0 */
+ lo |= (bits<<16);
+ lo |= (1<<8); /* EnableSoftBusRatio */
+ lo |= revkey;
+
+ /* Set FSB */
+ if (can_scale_fsb==1) {
+ lo &= ~(1<<28|1<<29);
+ switch (bestfsb) {
+ case 66: lo |= (1<<28|1<<29); /* 11 */
+ break;
+ case 100: lo |= 1<<28; /* 01 */
+ break;
+ case 133: break; /* 00*/
+ }
+ }
+ wrmsr (MSR_VIA_LONGHAUL, lo, hi);
+ __hlt();
+
+ rdmsr (MSR_VIA_LONGHAUL, lo, hi);
+ lo &= ~(1<<8);
+ lo |= revkey;
+ wrmsr (MSR_VIA_LONGHAUL, lo, hi);
+ break;
+ }
+}
+
+static int __init longhaul_get_cpu_fsb (void)
+{
+ unsigned long invalue=0,lo, hi;
+
+ if (current_fsb == 0) {
+ rdmsr (MSR_IA32_EBL_CR_POWERON, lo, hi);
+ invalue = (lo & (1<<18|1<<19)) >>18;
+ return eblcr_fsb_table[invalue];
+ } else {
+ return current_fsb;
+ }
+}
+
+
+static int __init longhaul_get_cpu_mult (void)
+{
+ unsigned long invalue=0,lo, hi;
+
+ rdmsr (MSR_IA32_EBL_CR_POWERON, lo, hi);
+ invalue = (lo & (1<<22|1<<23|1<<24|1<<25)) >>22;
+ if (longhaul==3) {
+ if (lo & (1<<27))
+ invalue+=16;
+ }
+ return eblcr_table[invalue];
+}
+
+
+static void __init longhaul_get_ranges (void)
+{
+ unsigned long lo, hi, invalue;
+ unsigned int minmult=0, maxmult=0, minfsb=0, maxfsb=0;
+ unsigned int multipliers[32]= {
+ 50,30,40,100,55,35,45,95,90,70,80,60,120,75,85,65,
+ -1,110,120,-1,135,115,125,105,130,150,160,140,-1,155,-1,145 };
+ unsigned int fsb_table[4] = { 133, 100, -1, 66 };
+
+ switch (longhaul) {
+ case 1:
+ /* Ugh, Longhaul v1 didn't have the min/max MSRs.
+ Assume max = whatever we booted at. */
+ maxmult = longhaul_get_cpu_mult();
+ break;
+
+ case 2 ... 3:
+ rdmsr (MSR_VIA_LONGHAUL, lo, hi);
+
+ invalue = (hi & (1<<0|1<<1|1<<2|1<<3));
+ if (hi & (1<<11))
+ invalue += 16;
+ maxmult=multipliers[invalue];
+
+#if 0 /* This is MaxMhz @ Min Voltage. Ignore for now */
+ invalue = (hi & (1<<16|1<<17|1<<18|1<<19)) >> 16;
+ if (hi & (1<<27))
+ invalue += 16;
+ minmult = multipliers[invalue];
+#else
+ minmult = 30; /* as per spec */
+#endif
+
+ if (can_scale_fsb==1) {
+ invalue = (hi & (1<<9|1<<10)) >> 9;
+ maxfsb = fsb_table[invalue];
+
+ invalue = (hi & (1<<25|1<<26)) >> 25;
+ minfsb = fsb_table[invalue];
+
+ dprintk (KERN_INFO "longhaul: Min FSB=%d Max FSB=%d\n",
+ minfsb, maxfsb);
+ } else {
+ minfsb = maxfsb = current_fsb;
+ }
+ break;
+ }
+
+ highest_speed = maxmult * maxfsb * 100;
+ lowest_speed = minmult * minfsb * 100;
+
+ dprintk (KERN_INFO "longhaul: MinMult(x10)=%d MaxMult(x10)=%d\n",
+ minmult, maxmult);
+ dprintk (KERN_INFO "longhaul: Lowestspeed=%d Highestspeed=%d\n",
+ lowest_speed, highest_speed);
+}
+
+
+static void __init longhaul_setup_voltagescaling (unsigned long lo, unsigned long hi)
+{
+ int revkey;
+
+ can_scale_voltage = 1;
+
+ minvid = (hi & (1<<20|1<<21|1<<22|1<<23|1<<24)) >> 20; /* 56:52 */
+ maxvid = (hi & (1<<4|1<<5|1<<6|1<<7|1<<8)) >> 4; /* 40:36 */
+ vrmrev = (lo & (1<<15))>>15;
+
+ if (vrmrev==0) {
+ dprintk (KERN_INFO "longhaul: VRM 8.5 : ");
+ memcpy (voltage_table, vrm85scales, sizeof(voltage_table));
+ numvscales = (voltage_table[maxvid]-voltage_table[minvid])/25;
+ } else {
+ dprintk (KERN_INFO "longhaul: Mobile VRM : ");
+ memcpy (voltage_table, mobilevrmscales, sizeof(voltage_table));
+ numvscales = (voltage_table[maxvid]-voltage_table[minvid])/5;
+ }
+
+ /* Current voltage isn't readable at first, so we need to
+ set it to a known value. The spec says to use maxvid */
+ revkey = (lo & 0xf)<<4; /* Rev key. */
+ lo &= 0xfe0fff0f; /* Mask unneeded bits */
+ lo |= (1<<9); /* EnableSoftVID */
+ lo |= revkey; /* Reinsert key */
+ lo |= maxvid << 20;
+ wrmsr (MSR_VIA_LONGHAUL, lo, hi);
+ minvid = voltage_table[minvid];
+ maxvid = voltage_table[maxvid];
+ dprintk ("Min VID=%d.%03d Max VID=%d.%03d, %d possible voltage scales\n",
+ maxvid/1000, maxvid%1000, minvid/1000, minvid%1000, numvscales);
+}
+
+
+static int __init longhaul_init (void)
+{
+ struct cpuinfo_x86 *c = cpu_data;
+ unsigned int currentspeed;
+ static int currentmult;
+ unsigned long lo, hi;
+ int ret;
+ struct cpufreq_driver *driver;
+
+ if ((c->x86_vendor != X86_VENDOR_CENTAUR) || (c->x86 !=6) )
+ return -ENODEV;
+
+ switch (c->x86_model) {
+ case 6: /* VIA C3 Samuel C5A */
+ longhaul=1;
+ memcpy (clock_ratio, longhaul1_clock_ratio, sizeof(longhaul1_clock_ratio));
+ memcpy (eblcr_table, samuel1_eblcr, sizeof(samuel1_eblcr));
+ break;
+
+ case 7: /* C5B / C5C */
+ switch (c->x86_mask) {
+ case 0:
+ longhaul=1;
+ memcpy (clock_ratio, longhaul1_clock_ratio, sizeof(longhaul1_clock_ratio));
+ memcpy (eblcr_table, samuel2_eblcr, sizeof(samuel2_eblcr));
+ break;
+ case 1 ... 15:
+ longhaul=2;
+ memcpy (clock_ratio, longhaul2_clock_ratio, sizeof(longhaul2_clock_ratio));
+ memcpy (eblcr_table, ezra_eblcr, sizeof(ezra_eblcr));
+ break;
+ }
+ break;
+
+ case 8: /* C5M/C5N */
+ return -ENODEV; // Waiting on updated docs from VIA before this is usable
+ longhaul=3;
+ numscales=32;
+ memcpy (clock_ratio, longhaul3_clock_ratio, sizeof(longhaul3_clock_ratio));
+ memcpy (eblcr_table, c5m_eblcr, sizeof(c5m_eblcr));
+ break;
+
+ default:
+ printk (KERN_INFO "longhaul: Unknown VIA CPU. Contact davej@suse.de\n");
+ return -ENODEV;
+ }
+
+ printk (KERN_INFO "longhaul: VIA CPU detected. Longhaul version %d supported\n", longhaul);
+
+ if (favour_fast_fsb==1)
+ fsb_search_table = perf_fsb_table;
+ else
+ fsb_search_table = power_fsb_table;
+
+ current_fsb = longhaul_get_cpu_fsb();
+ currentmult = longhaul_get_cpu_mult();
+ currentspeed = currentmult * current_fsb * 100;
+
+ dprintk (KERN_INFO "longhaul: CPU currently at %dMHz (%d x %d.%d)\n",
+ (currentspeed/1000), current_fsb, currentmult/10, currentmult%10);
+
+ if (longhaul==2 || longhaul==3) {
+ rdmsr (MSR_VIA_LONGHAUL, lo, hi);
+ if ((lo & (1<<0)) && (dont_scale_voltage==0))
+ longhaul_setup_voltagescaling (lo, hi);
+
+ if ((lo & (1<<1)) && (dont_scale_fsb==0) && (current_fsb==0))
+ can_scale_fsb = 1;
+ }
+
+ longhaul_get_ranges();
+
+ driver = kmalloc(sizeof(struct cpufreq_driver) +
+ sizeof(struct cpufreq_freqs), GFP_KERNEL);
+ if (!driver)
+ return -ENOMEM;
+
+ driver->freq = (struct cpufreq_freqs*) (driver + sizeof(struct cpufreq_driver));
+ driver->sync = CPUFREQ_SYNC;
+ driver->freq->cpu = CPUFREQ_ALL_CPUS;
+ driver->freq->min = (unsigned int) lowest_speed;
+ driver->freq->max = (unsigned int) highest_speed;
+ driver->freq->cur = currentspeed;
+ driver->validate = &longhaul_validatespeed;
+ driver->setspeed = &longhaul_set_cpu_frequency;
+
+ ret = cpufreq_register(driver);
+
+ if (ret) {
+ kfree(driver);
+ return ret;
+ }
+
+ longhaul_driver = driver;
+ return 0;
+}
+
+
+static void __exit longhaul_exit (void)
+{
+ if (longhaul_driver) {
+ cpufreq_unregister();
+ kfree(longhaul_driver);
+ }
+}
+
+MODULE_PARM (dont_scale_fsb, "i");
+MODULE_PARM (dont_scale_voltage, "i");
+MODULE_PARM (current_fsb, "i");
+MODULE_PARM (favour_fast_fsb, "i");
+
+MODULE_AUTHOR ("Dave Jones <davej@suse.de>");
+MODULE_DESCRIPTION ("Longhaul driver for VIA Cyrix processors.");
+MODULE_LICENSE ("GPL");
+
+module_init(longhaul_init);
+module_exit(longhaul_exit);
+
diff -ruN linux-2531orig/arch/i386/kernel/cpu/cpufreq/powernow-k6.c linux/arch/i386/kernel/cpu/cpufreq/powernow-k6.c
--- linux-2531orig/arch/i386/kernel/cpu/cpufreq/powernow-k6.c Thu Jan 1 01:00:00 1970
+++ linux/arch/i386/kernel/cpu/cpufreq/powernow-k6.c Wed Aug 28 10:51:46 2002
@@ -0,0 +1,242 @@
+/*
+ * $Id: powernow-k6.c,v 1.26 2002/08/19 15:00:57 davej Exp $
+ * This file was part of Powertweak Linux (http://powertweak.sf.net)
+ * and is shared with the Linux Kernel module.
+ *
+ * (C) 2000-2002 Dave Jones, Arjan van de Ven, Janne Pänkälä.
+ *
+ * Licensed under the terms of the GNU GPL License version 2.
+ *
+ * BIG FAT DISCLAIMER: Work in progress code. Possibly *dangerous*
+ */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/sched.h>
+#include <linux/init.h>
+#include <asm/msr.h>
+#include <asm/timex.h>
+#include <asm/io.h>
+#include <linux/delay.h>
+#include <linux/proc_fs.h>
+#include <linux/cpufreq.h>
+#include <linux/ioport.h>
+
+
+#define POWERNOW_IOPORT 0xfff0 /* it doesn't matter where, as long
+ as it is unused */
+
+static struct cpufreq_driver *powernow_driver;
+static unsigned int busfreq; /* FSB, in 10 kHz */
+static unsigned int max_multiplier;
+
+
+/* Clock ratio multiplied by 10 - see table 27 in AMD#23446 */
+static int clock_ratio[8] = {
+ 45, /* 000 -> 4.5x */
+ 50, /* 001 -> 5.0x */
+ 40, /* 010 -> 4.0x */
+ 55, /* 011 -> 5.5x */
+ 20, /* 100 -> 2.0x */
+ 30, /* 101 -> 3.0x */
+ 60, /* 110 -> 6.0x */
+ 35 /* 111 -> 3.5x */
+};
+
+
+/**
+ * powernow_k6_set_frequency - set the PowerNow! multiplier
+ * @cpu: CPU number
+ * @freq: new processor frequency in kHz
+ *
+ * Tries to change the PowerNow! multiplier
+ */
+void powernow_k6_set_frequency (unsigned int cpu, unsigned int freq)
+{
+ unsigned int i;
+ unsigned int best_i = 4;
+ unsigned int tmpfreq;
+ unsigned int newfreq = busfreq * 65;
+ unsigned long outvalue=0, invalue=0;
+ unsigned long msrval;
+ unsigned long cpus_allowed;
+
+ if (!powernow_driver || !freq || (freq > busfreq * max_multiplier)) {
+ printk(KERN_ERR "cpufreq: initialization problem or invalid target frequency\n");
+ return;
+ }
+
+ if (!cpu_online(cpu)) {
+ printk(KERN_ERR "cpufreq: CPU not present!\n");
+ return;
+ }
+
+ /* Find out which bit-pattern we want */
+ for (i=0; i<8; i++) {
+ tmpfreq = busfreq * clock_ratio[i];
+ if ((tmpfreq < newfreq) && (newfreq >= freq)) {
+ newfreq = tmpfreq;
+ best_i = i;
+ }
+ }
+
+ /* "best_i" now contains the bitpattern of the new multiplier.
+ we now need to transform it to the BVC format, see AMD#23446 */
+
+ outvalue = (1<<12) | (1<<10) | (1<<9) | (best_i<<5);
+
+ /*
+ * Save this threads cpus_allowed mask, and bind to the
+ * specified CPU. When this call returns, we should be
+ * running on the right CPU.
+ */
+ cpus_allowed = current->cpus_allowed;
+ set_cpus_allowed(current, 1 << cpu);
+ BUG_ON(cpu != smp_processor_id());
+
+ msrval = POWERNOW_IOPORT + 0x1;
+ wrmsr(MSR_K6_EPMR, msrval, 0); /* enable the PowerNow port */
+ invalue=inl(POWERNOW_IOPORT + 0x8);
+ invalue = invalue & 0xf;
+ outvalue = outvalue | invalue;
+ outl(outvalue ,(POWERNOW_IOPORT + 0x8));
+ msrval = POWERNOW_IOPORT + 0x0;
+ wrmsr(MSR_K6_EPMR, msrval, 0); /* disable it again */
+
+ /*
+ * Restore the CPUs allowed mask.
+ */
+ set_cpus_allowed(current, cpus_allowed);
+
+ return;
+}
+
+
+/**
+ * powernow_k6_get_cpu_multiplier - returns the current FSB multiplier
+ *
+ * Returns the current setting of the frequency multiplier. Core clock
+ * speed is frequency of the Front-Side Bus multiplied with this value.
+ */
+static int powernow_k6_get_cpu_multiplier(void)
+{
+ u64 invalue = 0;
+ u32 msrval;
+
+ msrval = POWERNOW_IOPORT + 0x1;
+ wrmsr(MSR_K6_EPMR, msrval, 0); /* enable the PowerNow port */
+ invalue=inl(POWERNOW_IOPORT + 0x8);
+ msrval = POWERNOW_IOPORT + 0x0;
+ wrmsr(MSR_K6_EPMR, msrval, 0); /* disable it again */
+
+ return clock_ratio[(invalue >> 5)&7];
+}
+
+
+/**
+ * powernow_k6_validate_frequency - validates the CPU frequency to be set
+ * @cpu: CPU number
+ * @kHz: suggested new CPU frequency
+ *
+ * Makes sure the CPU frequency to be set is valid.
+ */
+unsigned int powernow_k6_validate_frequency(unsigned int cpu, unsigned int kHz)
+{
+ int i;
+ unsigned int tmpfreq;
+ unsigned int newfreq = busfreq * 65;
+
+ if (kHz >= busfreq * max_multiplier)
+ return (busfreq * max_multiplier);
+
+ for (i=0; i<8; i++) {
+ tmpfreq = busfreq * clock_ratio[i];
+ if ((tmpfreq < newfreq) && (newfreq >= kHz))
+ newfreq = tmpfreq;
+ }
+
+ return tmpfreq;
+}
+
+
+/**
+ * powernow_k6_init - initializes the k6 PowerNow! CPUFreq driver
+ *
+ * Initializes the K6 PowerNow! support. Returns -ENODEV on unsupported
+ * devices, -EINVAL or -ENOMEM on problems during initiatization, and zero
+ * on success.
+ */
+static int __init powernow_k6_init(void)
+{
+ struct cpuinfo_x86 *c = cpu_data;
+ struct cpufreq_driver *driver;
+ unsigned int result;
+ unsigned int i;
+
+ if ((c->x86_vendor != X86_VENDOR_AMD) || (c->x86 != 5) ||
+ ((c->x86_model != 12) && (c->x86_model != 13)))
+ return -ENODEV;
+
+ /* it is assumed that all CPUs run at the same, highest frequency */
+ max_multiplier = powernow_k6_get_cpu_multiplier();
+ busfreq = cpu_khz / max_multiplier;
+
+ if (!request_region(POWERNOW_IOPORT, 16, "PowerNow!")) {
+ printk("cpufreq: PowerNow IOPORT region already used.\n");
+ return -EIO;
+ }
+
+ /* initialization of main "cpufreq" code*/
+ driver = kmalloc(sizeof(struct cpufreq_driver) +
+ NR_CPUS * sizeof(struct cpufreq_freqs), GFP_KERNEL);
+ if (!driver) {
+ release_region (POWERNOW_IOPORT, 16);
+ return -ENOMEM;
+ }
+
+ driver->freq = (struct cpufreq_freqs*) (driver + sizeof(struct cpufreq_driver));
+ driver->sync = CPUFREQ_ASYNC;
+
+ for (i=0; i<NR_CPUS; i++) {
+ if (!cpu_online(i))
+ continue;
+ driver->freq[i].cpu = i;
+ driver->freq[i].min = busfreq * 2.0;
+ driver->freq[i].max = busfreq * max_multiplier;
+ driver->freq[i].cur = busfreq * max_multiplier;
+ }
+
+ driver->validate = &powernow_k6_validate_frequency;
+ driver->setspeed = &powernow_k6_set_frequency;
+
+ result = cpufreq_register(driver);
+ if (result) {
+ release_region (POWERNOW_IOPORT, 16);
+ kfree(driver);
+ return result;
+ }
+ powernow_driver = driver;
+
+ return 0;
+}
+
+
+/**
+ * powernow_k6_exit - unregisters AMD K6-2+/3+ PowerNow! support
+ *
+ * Unregisters AMD K6-2+ / K6-3+ PowerNow! support.
+ */
+static void __exit powernow_k6_exit(void)
+{
+ if (powernow_driver) {
+ cpufreq_unregister();
+ kfree(powernow_driver);
+ }
+}
+
+
+MODULE_AUTHOR ("Arjan van de Ven <arjanv@redhat.com>, Dave Jones <davej@suse.de>, Dominik Brodowski <devel@brodo.de>");
+MODULE_DESCRIPTION ("PowerNow! driver for AMD K6-2+ / K6-3+ processors.");
+MODULE_LICENSE ("GPL");
+module_init(powernow_k6_init);
+module_exit(powernow_k6_exit);
diff -ruN linux-2531orig/arch/i386/kernel/cpu/cpufreq/speedstep.c linux/arch/i386/kernel/cpu/cpufreq/speedstep.c
--- linux-2531orig/arch/i386/kernel/cpu/cpufreq/speedstep.c Thu Jan 1 01:00:00 1970
+++ linux/arch/i386/kernel/cpu/cpufreq/speedstep.c Wed Aug 28 10:51:46 2002
@@ -0,0 +1,656 @@
+/*
+ * $Id: speedstep.c,v 1.44 2002/08/17 17:28:25 db Exp $
+ *
+ * (C) 2001 Dave Jones, Arjan van de ven.
+ * (C) 2002 Dominik Brodowski <devel@brodo.de>
+ *
+ * Licensed under the terms of the GNU GPL License version 2.
+ * Based upon reverse engineered information, and on Intel documentation
+ * for chipsets ICH2-M and ICH3-M.
+ *
+ * Many thanks to Ducrot Bruno for finding and fixing the last
+ * "missing link" for ICH2-M/ICH3-M support, and to Thomas Winkler
+ * for extensive testing.
+ *
+ * BIG FAT DISCLAIMER: Work in progress code. Possibly *dangerous*
+ */
+
+
+/*********************************************************************
+ * SPEEDSTEP - DEFINITIONS *
+ *********************************************************************/
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/sched.h>
+#include <linux/init.h>
+#include <asm/msr.h>
+#include <asm/timex.h>
+#include <asm/io.h>
+#include <asm/processor.h>
+#include <linux/delay.h>
+#include <linux/proc_fs.h>
+#include <linux/cpufreq.h>
+#include <linux/pci.h>
+#include <linux/slab.h>
+
+
+static struct cpufreq_driver *speedstep_driver;
+
+/* speedstep_chipset:
+ * It is necessary to know which chipset is used. As accesses to
+ * this device occur at various places in this module, we need a
+ * static struct pci_dev * pointing to that device.
+ */
+static unsigned int speedstep_chipset;
+static struct pci_dev *speedstep_chipset_dev;
+
+#define SPEEDSTEP_CHIPSET_ICH2M 0x00000002
+#define SPEEDSTEP_CHIPSET_ICH3M 0x00000003
+
+
+/* speedstep_processor
+ */
+static unsigned int speedstep_processor;
+
+#define SPEEDSTEP_PROCESSOR_PIII_C 0x00000001 /* Coppermine core */
+#define SPEEDSTEP_PROCESSOR_PIII_T 0x00000002 /* Tualatin core */
+#define SPEEDSTEP_PROCESSOR_P4M 0x00000003 /* P4-M with 100 MHz FSB */
+
+
+/* speedstep_[low,high]_freq
+ * There are only two frequency states for each processor. Values
+ * are in kHz for the time being.
+ */
+static unsigned int speedstep_low_freq;
+static unsigned int speedstep_high_freq;
+
+
+/* DEBUG
+ * Define it if you want verbose debug output, e.g. for bug reporting
+ */
+//#define SPEEDSTEP_DEBUG
+
+#ifdef SPEEDSTEP_DEBUG
+#define dprintk(msg...) printk(msg)
+#else
+#define dprintk(msg...) do { } while(0);
+#endif
+
+
+
+/*********************************************************************
+ * LOW LEVEL CHIPSET INTERFACE *
+ *********************************************************************/
+
+/**
+ * speedstep_get_frequency - read the current SpeedStep state
+ * @freq: current processor frequency in kHz
+ *
+ * Tries to read the SpeedStep state. Returns -EIO when there has been
+ * trouble to read the status or write to the control register, -EINVAL
+ * on an unsupported chipset, and zero on success.
+ */
+static int speedstep_get_frequency (unsigned int *freq)
+{
+ u32 pmbase;
+ u8 value;
+
+ if (!speedstep_chipset_dev || !freq)
+ return -EINVAL;
+
+ switch (speedstep_chipset) {
+ case SPEEDSTEP_CHIPSET_ICH2M:
+ case SPEEDSTEP_CHIPSET_ICH3M:
+ /* get PMBASE */
+ pci_read_config_dword(speedstep_chipset_dev, 0x40, &pmbase);
+ if (!(pmbase & 0x01))
+ return -EIO;
+
+ pmbase &= 0xFFFFFFFE;
+ if (!pmbase)
+ return -EIO;
+
+ /* read state */
+ local_irq_disable();
+ value = inb(pmbase + 0x50);
+ local_irq_enable();
+
+ dprintk(KERN_DEBUG "cpufreq: read at pmbase 0x%x + 0x50 returned 0x%x\n", pmbase, value);
+
+ *freq = (value & 0x01) ? speedstep_low_freq : \
+ speedstep_high_freq;
+ return 0;
+
+ }
+
+ printk (KERN_ERR "cpufreq: setting CPU frequency on this chipset unsupported.\n");
+ return -EINVAL;
+}
+
+
+/**
+ * speedstep_set_frequency - set the SpeedStep state
+ * @cpu: CPU number
+ * @freq: new processor frequency in kHz
+ *
+ * Tries to change the SpeedStep state.
+ */
+void speedstep_set_frequency (unsigned int cpu, unsigned int freq)
+{
+ u32 pmbase;
+ u8 pm2_blk;
+ u8 value;
+ unsigned long flags;
+
+ if (cpu && (cpu != CPUFREQ_ALL_CPUS))
+ return;
+
+ if (!speedstep_chipset_dev || !freq) {
+ printk(KERN_ERR "cpufreq: unknown chipset or state\n");
+ return;
+ }
+
+ switch (speedstep_chipset) {
+ case SPEEDSTEP_CHIPSET_ICH2M:
+ case SPEEDSTEP_CHIPSET_ICH3M:
+ /* get PMBASE */
+ pci_read_config_dword(speedstep_chipset_dev, 0x40, &pmbase);
+ if (!(pmbase & 0x01))
+ return;
+
+ pmbase &= 0xFFFFFFFE;
+ if (!pmbase)
+ return;
+
+ /* read state */
+ local_irq_disable();
+ value = inb(pmbase + 0x50);
+ local_irq_enable();
+
+ dprintk(KERN_DEBUG "cpufreq: read at pmbase 0x%x + 0x50 returned 0x%x\n", pmbase, value);
+
+ /* write new state, but only if indeed a transition
+ * is necessary */
+ if (freq == ((value & 0x01) ? speedstep_low_freq : \
+ speedstep_high_freq))
+ return;
+
+ value = (freq == speedstep_high_freq) ? 0x00 : 0x01;
+
+ dprintk(KERN_DEBUG "cpufreq: writing 0x%x to pmbase 0x%x + 0x50\n", value, pmbase);
+
+ /* Disable IRQs */
+ local_irq_save(flags);
+ local_irq_disable();
+
+ /* Disable bus master arbitration */
+ pm2_blk = inb(pmbase + 0x20);
+ pm2_blk |= 0x01;
+ outb(pm2_blk, (pmbase + 0x20));
+
+ /* Actual transition */
+ outb(value, (pmbase + 0x50));
+
+ /* Restore bus master arbitration */
+ pm2_blk &= 0xfe;
+ outb(pm2_blk, (pmbase + 0x20));
+
+ /* Enable IRQs */
+ local_irq_enable();
+ local_irq_restore(flags);
+
+ /* check if transition was sucessful */
+ local_irq_disable();
+ value = inb(pmbase + 0x50);
+ local_irq_enable();
+
+ dprintk(KERN_DEBUG "cpufreq: read at pmbase 0x%x + 0x50 returned 0x%x\n", pmbase, value);
+
+ if (freq == ((value & 0x01) ? speedstep_low_freq : \
+ speedstep_high_freq)) {
+ dprintk (KERN_INFO "cpufreq: change to %u MHz succeded\n", (freq / 1000));
+ return;
+ }
+
+ printk (KERN_ERR "cpufreq: change failed - I/O error\n");
+ return;
+ }
+
+ printk (KERN_ERR "cpufreq: setting CPU frequency on this chipset unsupported.\n");
+ return;
+}
+
+
+/**
+ * speedstep_activate - activate SpeedStep control in the chipset
+ *
+ * Tries to activate the SpeedStep status and control registers.
+ * Returns -EINVAL on an unsupported chipset, and zero on success.
+ */
+static int speedstep_activate (void)
+{
+ if (!speedstep_chipset_dev)
+ return -EINVAL;
+
+ switch (speedstep_chipset) {
+ case SPEEDSTEP_CHIPSET_ICH2M:
+ case SPEEDSTEP_CHIPSET_ICH3M:
+ {
+ u16 value = 0;
+
+ pci_read_config_word(speedstep_chipset_dev,
+ 0x00A0, &value);
+ if (!(value & 0x08)) {
+ value |= 0x08;
+ dprintk(KERN_DEBUG "cpufreq: activating SpeedStep (TM) registers\n");
+ pci_write_config_word(speedstep_chipset_dev,
+ 0x00A0, value);
+ }
+
+ return 0;
+ }
+ }
+
+ printk (KERN_ERR "cpufreq: SpeedStep (TM) on this chipset unsupported.\n");
+ return -EINVAL;
+}
+
+
+/**
+ * speedstep_detect_chipset - detect the Southbridge which contains SpeedStep logic
+ *
+ * Detects PIIX4, ICH2-M and ICH3-M so far. The pci_dev points to
+ * the LPC bridge / PM module which contains all power-management
+ * functions. Returns the SPEEDSTEP_CHIPSET_-number for the detected
+ * chipset, or zero on failure.
+ */
+static unsigned int speedstep_detect_chipset (void)
+{
+ speedstep_chipset_dev = pci_find_subsys(PCI_VENDOR_ID_INTEL,
+ PCI_DEVICE_ID_INTEL_82801CA_12,
+ PCI_ANY_ID,
+ PCI_ANY_ID,
+ NULL);
+ if (speedstep_chipset_dev)
+ return SPEEDSTEP_CHIPSET_ICH3M;
+
+
+ speedstep_chipset_dev = pci_find_subsys(PCI_VENDOR_ID_INTEL,
+ PCI_DEVICE_ID_INTEL_82801BA_10,
+ PCI_ANY_ID,
+ PCI_ANY_ID,
+ NULL);
+ if (speedstep_chipset_dev)
+ return SPEEDSTEP_CHIPSET_ICH2M;
+
+
+ return 0;
+}
+
+
+
+/*********************************************************************
+ * LOW LEVEL PROCESSOR INTERFACE *
+ *********************************************************************/
+
+
+/**
+ * pentium3_get_frequency - get the core frequencies for PIIIs
+ *
+ * Returns the core frequency of a Pentium III processor (in kHz)
+ */
+static unsigned int pentium3_get_frequency (void)
+{
+ /* See table 14 of p3_ds.pdf and table 22 of 29834003.pdf */
+ struct {
+ unsigned int ratio; /* Frequency Multiplier (x10) */
+ u8 bitmap; /* power on configuration bits
+ [27, 25:22] (in MSR 0x2a) */
+ } msr_decode_mult [] = {
+ { 30, 0x01 },
+ { 35, 0x05 },
+ { 40, 0x02 },
+ { 45, 0x06 },
+ { 50, 0x00 },
+ { 55, 0x04 },
+ { 60, 0x0b },
+ { 65, 0x0f },
+ { 70, 0x09 },
+ { 75, 0x0d },
+ { 80, 0x0a },
+ { 85, 0x26 },
+ { 90, 0x20 },
+ { 100, 0x2b },
+ { 0, 0xff } /* error or unknown value */
+ };
+ /* PIII(-M) FSB settings: see table b1-b of 24547206.pdf */
+ struct {
+ unsigned int value; /* Front Side Bus speed in MHz */
+ u8 bitmap; /* power on configuration bits [18: 19]
+ (in MSR 0x2a) */
+ } msr_decode_fsb [] = {
+ { 66, 0x0 },
+ { 100, 0x2 },
+ { 133, 0x1 },
+ { 0, 0xff}
+ };
+ u32 msr_lo, msr_tmp;
+ int i = 0, j = 0;
+ struct cpuinfo_x86 *c = cpu_data;
+
+ /* read MSR 0x2a - we only need the low 32 bits */
+ rdmsr(MSR_IA32_EBL_CR_POWERON, msr_lo, msr_tmp);
+ dprintk(KERN_DEBUG "cpufreq: P3 - MSR_IA32_EBL_CR_POWERON: 0x%x 0x%x\n", msr_lo, msr_tmp);
+ msr_tmp = msr_lo;
+
+ /* decode the FSB */
+ msr_tmp &= 0x00c0000;
+ msr_tmp >>= 18;
+ while (msr_tmp != msr_decode_fsb[i].bitmap) {
+ if (msr_decode_fsb[i].bitmap == 0xff)
+ return -EINVAL;
+ i++;
+ }
+
+ /* decode the multiplier */
+ if ((c->x86_model == 0x08) && (c->x86_mask == 0x01))
+ /* different on early Coppermine PIII */
+ msr_lo &= 0x03c00000;
+ else
+ msr_lo &= 0x0bc00000;
+ msr_lo >>= 22;
+ while (msr_lo != msr_decode_mult[j].bitmap) {
+ if (msr_decode_mult[j].bitmap == 0xff)
+ return -EINVAL;
+ j++;
+ }
+
+ return (msr_decode_mult[j].ratio * msr_decode_fsb[i].value * 100);
+}
+
+
+/**
+ * pentium4_get_frequency - get the core frequency for P4-Ms
+ *
+ * Should return the core frequency (in kHz) for P4-Ms.
+ */
+static unsigned int pentium4_get_frequency(void)
+{
+ u32 msr_lo, msr_hi;
+
+ rdmsr(0x2c, msr_lo, msr_hi);
+
+ dprintk(KERN_DEBUG "cpufreq: P4 - MSR_EBC_FREQUENCY_ID: 0x%x 0x%x\n", msr_lo, msr_hi);
+
+ /* First 12 bits seem to change a lot (0x511, 0x410 and 0x30f seen
+ * yet). Next 12 bits always seem to be 0x300. If this is not true
+ * on this CPU, complain. Last 8 bits are frequency (in 100MHz).
+ */
+ if (msr_hi || ((msr_lo & 0x00FFF000) != 0x300000)) {
+ printk(KERN_DEBUG "cpufreq: P4 - MSR_EBC_FREQUENCY_ID: 0x%x 0x%x\n", msr_lo, msr_hi);
+ printk(KERN_INFO "cpufreq: problem in initialization. Please contact Dominik Brodowski\n");
+ printk(KERN_INFO "cpufreq: <devel@brodo.de> and attach this dmesg. Thanks in advance\n");
+ return 0;
+ }
+
+ msr_lo >>= 24;
+ return (msr_lo * 100000);
+}
+
+
+/**
+ * speedstep_detect_processor - detect Intel SpeedStep-capable processors.
+ *
+ * Returns the SPEEDSTEP_PROCESSOR_-number for the detected chipset,
+ * or zero on failure.
+ */
+static unsigned int speedstep_detect_processor (void)
+{
+ struct cpuinfo_x86 *c = cpu_data;
+ u32 ebx;
+
+ if ((c->x86_vendor != X86_VENDOR_INTEL) ||
+ ((c->x86 != 6) && (c->x86 != 0xF)))
+ return 0;
+
+ if (c->x86 == 0xF) {
+ /* Intel Pentium 4 Mobile P4-M */
+ if (c->x86_model != 2)
+ return 0;
+
+ if (c->x86_mask != 4)
+ return 0;
+
+ ebx = cpuid_ebx(0x00000001);
+ ebx &= 0x000000FF;
+ if ((ebx != 0x0e) && (ebx != 0x0f))
+ return 0;
+
+ return SPEEDSTEP_PROCESSOR_P4M;
+ }
+
+ switch (c->x86_model) {
+ case 0x0B: /* Intel PIII [Tualatin] */
+ /* cpuid_ebx(1) is 0x04 for desktop PIII,
+ 0x06 for mobile PIII-M */
+ ebx = cpuid_ebx(0x00000001);
+
+ ebx &= 0x000000FF;
+ if (ebx != 0x06)
+ return 0;
+
+ /* So far all PIII-M processors support SpeedStep. See
+ * Intel's 24540633.pdf of August 2002
+ */
+
+ return SPEEDSTEP_PROCESSOR_PIII_T;
+
+ case 0x08: /* Intel PIII [Coppermine] */
+ /* based on reverse-engineering information and
+ * some guessing. HANDLE WITH CARE! */
+ {
+ u32 msr_lo, msr_hi;
+
+ /* all mobile PIII Coppermines have FSB 100 MHz
+ * ==> sort out a few desktop PIIIs. */
+ rdmsr(MSR_IA32_EBL_CR_POWERON, msr_lo, msr_hi);
+ dprintk(KERN_DEBUG "cpufreq: Coppermine: MSR_IA32_EBL_Cr_POWERON is 0x%x, 0x%x\n", msr_lo, msr_hi);
+ msr_lo &= 0x00c0000;
+ if (msr_lo != 0x0080000)
+ return 0;
+
+ /* platform ID seems to be 0x00140000 */
+ rdmsr(MSR_IA32_PLATFORM_ID, msr_lo, msr_hi);
+ dprintk(KERN_DEBUG "cpufreq: Coppermine: MSR_IA32_PLATFORM ID is 0x%x, 0x%x\n", msr_lo, msr_hi);
+ msr_hi = msr_lo & 0x001c0000;
+ if (msr_hi != 0x00140000)
+ return 0;
+
+ /* and these bits seem to be either 00_b, 01_b or
+ * 10_b but never 11_b */
+ msr_lo &= 0x00030000;
+ if (msr_lo == 0x0030000)
+ return 0;
+
+ /* let's hope this is correct... */
+ return SPEEDSTEP_PROCESSOR_PIII_C;
+ }
+
+ default:
+ return 0;
+ }
+}
+
+
+
+/*********************************************************************
+ * HIGH LEVEL FUNCTIONS *
+ *********************************************************************/
+
+
+/**
+ * speedstep_detect_speeds - detects low and high CPU frequencies.
+ *
+ * Detects the low and high CPU frequencies in kHz. Returns 0 on
+ * success or -EINVAL / -EIO on problems.
+ */
+static int speedstep_detect_speeds (void)
+{
+ unsigned int state;
+ int i, result;
+
+ for (i=0; i<2; i++) {
+ /* read the current state */
+ result = speedstep_get_frequency(&state);
+ if (result)
+ return result;
+
+ /* save the correct value, and switch to other */
+ if (state == speedstep_low_freq) {
+ switch (speedstep_processor) {
+ case SPEEDSTEP_PROCESSOR_PIII_C:
+ case SPEEDSTEP_PROCESSOR_PIII_T:
+ speedstep_low_freq = pentium3_get_frequency();
+ break;
+ case SPEEDSTEP_PROCESSOR_P4M:
+ speedstep_low_freq = pentium4_get_frequency();
+ }
+ speedstep_set_frequency(0, speedstep_high_freq);
+ } else {
+ switch (speedstep_processor) {
+ case SPEEDSTEP_PROCESSOR_PIII_C:
+ case SPEEDSTEP_PROCESSOR_PIII_T:
+ speedstep_high_freq = pentium3_get_frequency();
+ break;
+ case SPEEDSTEP_PROCESSOR_P4M:
+ speedstep_high_freq = pentium4_get_frequency();
+ }
+ speedstep_set_frequency(0, speedstep_low_freq);
+ }
+
+ if (!speedstep_low_freq || !speedstep_high_freq || (speedstep_low_freq == speedstep_high_freq))
+ return -EIO;
+ }
+
+ return 0;
+}
+
+
+/**
+ * speedstep_validate_frequency - validates the CPU frequency to be set
+ * @cpu: CPU number
+ * @kHz: suggested new CPU frequency
+ *
+ * Makes sure the CPU frequency to be set is valid.
+ */
+unsigned int speedstep_validate_frequency(unsigned int cpu, unsigned int kHz)
+{
+ if (cpu && (cpu != CPUFREQ_ALL_CPUS))
+ return 0;
+
+ if (kHz <= speedstep_low_freq)
+ return speedstep_low_freq;
+ else
+ return speedstep_high_freq;
+}
+
+
+/**
+ * speedstep_init - initializes the SpeedStep CPUFreq driver
+ *
+ * Initializes the SpeedStep support. Returns -ENODEV on unsupported
+ * devices, -EINVAL on problems during initiatization, and zero on
+ * success.
+ */
+static int __init speedstep_init(void)
+{
+ int result;
+ unsigned int speed;
+ struct cpufreq_driver *driver;
+
+
+ /* detect chipset */
+ speedstep_chipset = speedstep_detect_chipset();
+
+ /* detect chipset */
+ if (speedstep_chipset)
+ speedstep_processor = speedstep_detect_processor();
+
+ if ((!speedstep_chipset) || (!speedstep_processor)) {
+ dprintk(KERN_INFO "cpufreq: Intel(R) SpeedStep(TM) for this %s not (yet) available.\n", speedstep_processor ? "chipset" : "processor");
+ return -ENODEV;
+ }
+
+ /* startup values, correct ones will be detected later */
+ speedstep_low_freq = 1;
+ speedstep_high_freq = 2;
+
+ dprintk(KERN_INFO "cpufreq: Intel(R) SpeedStep(TM) support $Revision: 1.44 $\n");
+ dprintk(KERN_DEBUG "cpufreq: chipset 0x%x - processor 0x%x\n",
+ speedstep_chipset, speedstep_processor);
+
+ /* activate speedstep support */
+ result = speedstep_activate();
+ if (result)
+ return result;
+
+ /* detect low and high frequency */
+ result = speedstep_detect_speeds();
+ if (result)
+ return result;
+
+ /* get current speed setting */
+ result = speedstep_get_frequency(&speed);
+ if (result)
+ return result;
+
+ dprintk(KERN_INFO "cpufreq: currently at %s speed setting - %i MHz\n",
+ (speed == speedstep_low_freq) ? "low" : "high",
+ (speed / 1000));
+
+ /* initialization of main "cpufreq" code*/
+ driver = kmalloc(sizeof(struct cpufreq_driver) +
+ sizeof(struct cpufreq_freqs), GFP_KERNEL);
+ if (!driver)
+ return -ENOMEM;
+
+ driver->freq = (struct cpufreq_freqs*) (driver + sizeof(struct cpufreq_driver));
+ driver->sync = CPUFREQ_SYNC;
+ driver->freq->cpu = CPUFREQ_ALL_CPUS;
+ driver->freq->min = speedstep_low_freq;
+ driver->freq->max = speedstep_high_freq;
+ driver->freq->cur = speed;
+ driver->validate = &speedstep_validate_frequency;
+ driver->setspeed = &speedstep_set_frequency;
+
+ result = cpufreq_register(driver);
+ if (result) {
+ kfree(driver);
+ return result;
+ }
+ speedstep_driver = driver;
+
+ return 0;
+}
+
+
+/**
+ * speedstep_exit - unregisters SpeedStep support
+ *
+ * Unregisters SpeedStep support.
+ */
+static void __exit speedstep_exit(void)
+{
+ if (speedstep_driver) {
+ cpufreq_unregister();
+ kfree(speedstep_driver);
+ }
+}
+
+
+MODULE_AUTHOR ("Dave Jones <davej@suse.de>, Dominik Brodowski <devel@brodo.de>");
+MODULE_DESCRIPTION ("Speedstep driver for Intel mobile processors.");
+MODULE_LICENSE ("GPL");
+module_init(speedstep_init);
+module_exit(speedstep_exit);
[-- Attachment #2: Type: application/pgp-signature, Size: 240 bytes --]
^ permalink raw reply [flat|nested] only message in thread
only message in thread, other threads:[~2002-08-28 11:48 UTC | newest]
Thread overview: (only message) (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2002-08-28 11:47 [PATCH][2.5.32] CPUfreq i386 drivers (3/4) Dominik Brodowski
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).