Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux-2.6

1 files changed, 444 insertions, 0 deletions

diff --git a/arch/x86/kernel/cpu/cpufreq/speedstep-lib.c b/arch/x86/kernel/cpu/cpufreq/speedstep-lib.c
new file mode 100644
index 00000000000..b1acc8ce316
--- /dev/null
+++ b/arch/x86/kernel/cpu/cpufreq/speedstep-lib.c
@@ -0,0 +1,444 @@
+/*
+ * (C) 2002 - 2003 Dominik Brodowski <linux@brodo.de>
+ *
+ *  Licensed under the terms of the GNU GPL License version 2.
+ *
+ *  Library for common functions for Intel SpeedStep v.1 and v.2 support
+ *
+ *  BIG FAT DISCLAIMER: Work in progress code. Possibly *dangerous*
+ */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/moduleparam.h>
+#include <linux/init.h>
+#include <linux/cpufreq.h>
+#include <linux/slab.h>
+
+#include <asm/msr.h>
+#include "speedstep-lib.h"
+
+#define dprintk(msg...) cpufreq_debug_printk(CPUFREQ_DEBUG_DRIVER, "speedstep-lib", msg)
+
+#ifdef CONFIG_X86_SPEEDSTEP_RELAXED_CAP_CHECK
+static int relaxed_check = 0;
+#else
+#define relaxed_check 0
+#endif
+
+/*********************************************************************
+ *                   GET PROCESSOR CORE SPEED IN KHZ                 *
+ *********************************************************************/
+
+static unsigned int pentium3_get_frequency (unsigned int processor)
+{
+        /* 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;
+
+	/* read MSR 0x2a - we only need the low 32 bits */
+	rdmsr(MSR_IA32_EBL_CR_POWERON, msr_lo, msr_tmp);
+	dprintk("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 0;
+		i++;
+	}
+
+	/* decode the multiplier */
+	if (processor == SPEEDSTEP_PROCESSOR_PIII_C_EARLY) {
+		dprintk("workaround for early PIIIs\n");
+		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 0;
+		j++;
+	}
+
+	dprintk("speed is %u\n", (msr_decode_mult[j].ratio * msr_decode_fsb[i].value * 100));
+
+	return (msr_decode_mult[j].ratio * msr_decode_fsb[i].value * 100);
+}
+
+
+static unsigned int pentiumM_get_frequency(void)
+{
+	u32 msr_lo, msr_tmp;
+
+	rdmsr(MSR_IA32_EBL_CR_POWERON, msr_lo, msr_tmp);
+	dprintk("PM - MSR_IA32_EBL_CR_POWERON: 0x%x 0x%x\n", msr_lo, msr_tmp);
+
+	/* see table B-2 of 24547212.pdf */
+	if (msr_lo & 0x00040000) {
+		printk(KERN_DEBUG "speedstep-lib: PM - invalid FSB: 0x%x 0x%x\n", msr_lo, msr_tmp);
+		return 0;
+	}
+
+	msr_tmp = (msr_lo >> 22) & 0x1f;
+	dprintk("bits 22-26 are 0x%x, speed is %u\n", msr_tmp, (msr_tmp * 100 * 1000));
+
+	return (msr_tmp * 100 * 1000);
+}
+
+static unsigned int pentium_core_get_frequency(void)
+{
+	u32 fsb = 0;
+	u32 msr_lo, msr_tmp;
+
+	rdmsr(MSR_FSB_FREQ, msr_lo, msr_tmp);
+	/* see table B-2 of 25366920.pdf */
+	switch (msr_lo & 0x07) {
+	case 5:
+		fsb = 100000;
+		break;
+	case 1:
+		fsb = 133333;
+		break;
+	case 3:
+		fsb = 166667;
+		break;
+	default:
+		printk(KERN_ERR "PCORE - MSR_FSB_FREQ undefined value");
+	}
+
+	rdmsr(MSR_IA32_EBL_CR_POWERON, msr_lo, msr_tmp);
+	dprintk("PCORE - MSR_IA32_EBL_CR_POWERON: 0x%x 0x%x\n", msr_lo, msr_tmp);
+
+	msr_tmp = (msr_lo >> 22) & 0x1f;
+	dprintk("bits 22-26 are 0x%x, speed is %u\n", msr_tmp, (msr_tmp * fsb));
+
+	return (msr_tmp * fsb);
+}
+
+
+static unsigned int pentium4_get_frequency(void)
+{
+	struct cpuinfo_x86 *c = &boot_cpu_data;
+	u32 msr_lo, msr_hi, mult;
+	unsigned int fsb = 0;
+
+	rdmsr(0x2c, msr_lo, msr_hi);
+
+	dprintk("P4 - MSR_EBC_FREQUENCY_ID: 0x%x 0x%x\n", msr_lo, msr_hi);
+
+	/* decode the FSB: see IA-32 Intel (C) Architecture Software
+	 * Developer's Manual, Volume 3: System Prgramming Guide,
+	 * revision #12 in Table B-1: MSRs in the Pentium 4 and
+	 * Intel Xeon Processors, on page B-4 and B-5.
+	 */
+	if (c->x86_model < 2)
+		fsb = 100 * 1000;
+	else {
+		u8 fsb_code = (msr_lo >> 16) & 0x7;
+		switch (fsb_code) {
+		case 0:
+			fsb = 100 * 1000;
+			break;
+		case 1:
+			fsb = 13333 * 10;
+			break;
+		case 2:
+			fsb = 200 * 1000;
+			break;
+		}
+	}
+
+	if (!fsb)
+		printk(KERN_DEBUG "speedstep-lib: couldn't detect FSB speed. Please send an e-mail to <linux@brodo.de>\n");
+
+	/* Multiplier. */
+	if (c->x86_model < 2)
+		mult = msr_lo >> 27;
+	else
+		mult = msr_lo >> 24;
+
+	dprintk("P4 - FSB %u kHz; Multiplier %u; Speed %u kHz\n", fsb, mult, (fsb * mult));
+
+	return (fsb * mult);
+}
+
+
+unsigned int speedstep_get_processor_frequency(unsigned int processor)
+{
+	switch (processor) {
+	case SPEEDSTEP_PROCESSOR_PCORE:
+		return pentium_core_get_frequency();
+	case SPEEDSTEP_PROCESSOR_PM:
+		return pentiumM_get_frequency();
+	case SPEEDSTEP_PROCESSOR_P4D:
+	case SPEEDSTEP_PROCESSOR_P4M:
+		return pentium4_get_frequency();
+	case SPEEDSTEP_PROCESSOR_PIII_T:
+	case SPEEDSTEP_PROCESSOR_PIII_C:
+	case SPEEDSTEP_PROCESSOR_PIII_C_EARLY:
+		return pentium3_get_frequency(processor);
+	default:
+		return 0;
+	};
+	return 0;
+}
+EXPORT_SYMBOL_GPL(speedstep_get_processor_frequency);
+
+
+/*********************************************************************
+ *                 DETECT SPEEDSTEP-CAPABLE PROCESSOR                *
+ *********************************************************************/
+
+unsigned int speedstep_detect_processor (void)
+{
+	struct cpuinfo_x86 *c = cpu_data;
+	u32 ebx, msr_lo, msr_hi;
+
+	dprintk("x86: %x, model: %x\n", c->x86, c->x86_model);
+
+	if ((c->x86_vendor != X86_VENDOR_INTEL) ||
+	    ((c->x86 != 6) && (c->x86 != 0xF)))
+		return 0;
+
+	if (c->x86 == 0xF) {
+		/* Intel Mobile Pentium 4-M
+		 * or Intel Mobile Pentium 4 with 533 MHz FSB */
+		if (c->x86_model != 2)
+			return 0;
+
+		ebx = cpuid_ebx(0x00000001);
+		ebx &= 0x000000FF;
+
+		dprintk("ebx value is %x, x86_mask is %x\n", ebx, c->x86_mask);
+
+		switch (c->x86_mask) {
+		case 4:
+			/*
+			 * B-stepping [M-P4-M]
+			 * sample has ebx = 0x0f, production has 0x0e.
+			 */
+			if ((ebx == 0x0e) || (ebx == 0x0f))
+				return SPEEDSTEP_PROCESSOR_P4M;
+			break;
+		case 7:
+			/*
+			 * C-stepping [M-P4-M]
+			 * needs to have ebx=0x0e, else it's a celeron:
+			 * cf. 25130917.pdf / page 7, footnote 5 even
+			 * though 25072120.pdf / page 7 doesn't say
+			 * samples are only of B-stepping...
+			 */
+			if (ebx == 0x0e)
+				return SPEEDSTEP_PROCESSOR_P4M;
+			break;
+		case 9:
+			/*
+			 * D-stepping [M-P4-M or M-P4/533]
+			 *
+			 * this is totally strange: CPUID 0x0F29 is
+			 * used by M-P4-M, M-P4/533 and(!) Celeron CPUs.
+			 * The latter need to be sorted out as they don't
+			 * support speedstep.
+			 * Celerons with CPUID 0x0F29 may have either
+			 * ebx=0x8 or 0xf -- 25130917.pdf doesn't say anything
+			 * specific.
+			 * M-P4-Ms may have either ebx=0xe or 0xf [see above]
+			 * M-P4/533 have either ebx=0xe or 0xf. [25317607.pdf]
+			 * also, M-P4M HTs have ebx=0x8, too
+			 * For now, they are distinguished by the model_id string
+			 */
+			if ((ebx == 0x0e) || (strstr(c->x86_model_id,"Mobile Intel(R) Pentium(R) 4") != NULL))
+				return SPEEDSTEP_PROCESSOR_P4M;
+			break;
+		default:
+			break;
+		}
+		return 0;
+	}
+
+	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);
+		dprintk("ebx is %x\n", ebx);
+
+		ebx &= 0x000000FF;
+
+		if (ebx != 0x06)
+			return 0;
+
+		/* So far all PIII-M processors support SpeedStep. See
+		 * Intel's 24540640.pdf of June 2003
+		 */
+		return SPEEDSTEP_PROCESSOR_PIII_T;
+
+	case 0x08: /* Intel PIII [Coppermine] */
+
+		/* 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("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;
+
+		/*
+		 * If the processor is a mobile version,
+		 * platform ID has bit 50 set
+		 * it has SpeedStep technology if either
+		 * bit 56 or 57 is set
+		 */
+		rdmsr(MSR_IA32_PLATFORM_ID, msr_lo, msr_hi);
+		dprintk("Coppermine: MSR_IA32_PLATFORM ID is 0x%x, 0x%x\n", msr_lo, msr_hi);
+		if ((msr_hi & (1<<18)) && (relaxed_check ? 1 : (msr_hi & (3<<24)))) {
+			if (c->x86_mask == 0x01) {
+				dprintk("early PIII version\n");
+				return SPEEDSTEP_PROCESSOR_PIII_C_EARLY;
+			} else
+				return SPEEDSTEP_PROCESSOR_PIII_C;
+		}
+
+	default:
+		return 0;
+	}
+}
+EXPORT_SYMBOL_GPL(speedstep_detect_processor);
+
+
+/*********************************************************************
+ *                     DETECT SPEEDSTEP SPEEDS                       *
+ *********************************************************************/
+
+unsigned int speedstep_get_freqs(unsigned int processor,
+				  unsigned int *low_speed,
+				  unsigned int *high_speed,
+				  unsigned int *transition_latency,
+				  void (*set_state) (unsigned int state))
+{
+	unsigned int prev_speed;
+	unsigned int ret = 0;
+	unsigned long flags;
+	struct timeval tv1, tv2;
+
+	if ((!processor) || (!low_speed) || (!high_speed) || (!set_state))
+		return -EINVAL;
+
+	dprintk("trying to determine both speeds\n");
+
+	/* get current speed */
+	prev_speed = speedstep_get_processor_frequency(processor);
+	if (!prev_speed)
+		return -EIO;
+
+	dprintk("previous speed is %u\n", prev_speed);
+
+	local_irq_save(flags);
+
+	/* switch to low state */
+	set_state(SPEEDSTEP_LOW);
+	*low_speed = speedstep_get_processor_frequency(processor);
+	if (!*low_speed) {
+		ret = -EIO;
+		goto out;
+	}
+
+	dprintk("low speed is %u\n", *low_speed);
+
+	/* start latency measurement */
+	if (transition_latency)
+		do_gettimeofday(&tv1);
+
+	/* switch to high state */
+	set_state(SPEEDSTEP_HIGH);
+
+	/* end latency measurement */
+	if (transition_latency)
+		do_gettimeofday(&tv2);
+
+	*high_speed = speedstep_get_processor_frequency(processor);
+	if (!*high_speed) {
+		ret = -EIO;
+		goto out;
+	}
+
+	dprintk("high speed is %u\n", *high_speed);
+
+	if (*low_speed == *high_speed) {
+		ret = -ENODEV;
+		goto out;
+	}
+
+	/* switch to previous state, if necessary */
+	if (*high_speed != prev_speed)
+		set_state(SPEEDSTEP_LOW);
+
+	if (transition_latency) {
+		*transition_latency = (tv2.tv_sec - tv1.tv_sec) * USEC_PER_SEC +
+			tv2.tv_usec - tv1.tv_usec;
+		dprintk("transition latency is %u uSec\n", *transition_latency);
+
+		/* convert uSec to nSec and add 20% for safety reasons */
+		*transition_latency *= 1200;
+
+		/* check if the latency measurement is too high or too low
+		 * and set it to a safe value (500uSec) in that case
+		 */
+		if (*transition_latency > 10000000 || *transition_latency < 50000) {
+			printk (KERN_WARNING "speedstep: frequency transition measured seems out of "
+					"range (%u nSec), falling back to a safe one of %u nSec.\n",
+					*transition_latency, 500000);
+			*transition_latency = 500000;
+		}
+	}
+
+out:
+	local_irq_restore(flags);
+	return (ret);
+}
+EXPORT_SYMBOL_GPL(speedstep_get_freqs);
+
+#ifdef CONFIG_X86_SPEEDSTEP_RELAXED_CAP_CHECK
+module_param(relaxed_check, int, 0444);
+MODULE_PARM_DESC(relaxed_check, "Don't do all checks for speedstep capability.");
+#endif
+
+MODULE_AUTHOR ("Dominik Brodowski <linux@brodo.de>");
+MODULE_DESCRIPTION ("Library for Intel SpeedStep 1 or 2 cpufreq drivers.");
+MODULE_LICENSE ("GPL");