From: Dominik Brodowski <linux@dominikbrodowski.net>
Date: Tue, 5 Dec 2006 01:39:16 +0000 (-0500)
Subject: [CPUFREQ] p4-clockmod: fix support for Core
X-Git-Url: http://git.lede-project.org./?a=commitdiff_plain;h=e11952b971ee729a8fdc2bfb1252f5760c0287b0;p=openwrt%2Fstaging%2Fblogic.git

[CPUFREQ] p4-clockmod: fix support for Core

Support for Core CPUs was broken in two ways in speedstep-lib: for x86_64,
we missed a MSR definition; for both x86_64 and i386, the FSB calculation
was wrong by four (it's a quad-pumped bus). Also increase the accuracy
of the calculation.

Signed-off-by: Dominik Brodowski <linux@dominikbrodowski.net>
Signed-off-by: Dave Jones <davej@redhat.com>
---

diff --git a/arch/i386/kernel/cpu/cpufreq/speedstep-lib.c b/arch/i386/kernel/cpu/cpufreq/speedstep-lib.c
index a709f6d67e25..d59277c00911 100644
--- a/arch/i386/kernel/cpu/cpufreq/speedstep-lib.c
+++ b/arch/i386/kernel/cpu/cpufreq/speedstep-lib.c
@@ -123,23 +123,22 @@ static unsigned int pentiumM_get_frequency(void)
 	return (msr_tmp * 100 * 1000);
 }
 
-#ifdef CONFIG_X86_32
 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 24547212.pdf */
+	/* see table B-2 of 25366920.pdf */
 	switch (msr_lo & 0x07) {
 	case 5:
-		fsb = 400;
+		fsb = 100000;
 		break;
 	case 1:
-		fsb = 533;
+		fsb = 133333;
 		break;
 	case 3:
-		fsb = 667;
+		fsb = 166667;
 		break;
 	default:
 		printk(KERN_ERR "PCORE - MSR_FSB_FREQ undefined value");
@@ -149,11 +148,11 @@ static unsigned int pentium_core_get_frequency(void)
 	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 * 1000));
+	dprintk("bits 22-26 are 0x%x, speed is %u\n", msr_tmp, (msr_tmp * fsb));
 
-	return (msr_tmp * fsb * 1000);
+	return (msr_tmp * fsb);
 }
-#endif
+
 
 static unsigned int pentium4_get_frequency(void)
 {
@@ -205,10 +204,8 @@ static unsigned int pentium4_get_frequency(void)
 unsigned int speedstep_get_processor_frequency(unsigned int processor)
 {
 	switch (processor) {
-#ifdef CONFIG_X86_32
 	case SPEEDSTEP_PROCESSOR_PCORE:
 		return pentium_core_get_frequency();
-#endif
 	case SPEEDSTEP_PROCESSOR_PM:
 		return pentiumM_get_frequency();
 	case SPEEDSTEP_PROCESSOR_P4D:
diff --git a/include/asm-x86_64/msr.h b/include/asm-x86_64/msr.h
index e61582288737..207fed998a0b 100644
--- a/include/asm-x86_64/msr.h
+++ b/include/asm-x86_64/msr.h
@@ -189,6 +189,7 @@ static inline unsigned int cpuid_edx(unsigned int op)
 
 #define MSR_IA32_PERFCTR0      0xc1
 #define MSR_IA32_PERFCTR1      0xc2
+#define MSR_FSB_FREQ		0xcd
 
 #define MSR_MTRRcap		0x0fe
 #define MSR_IA32_BBL_CR_CTL        0x119