Commit b8030f26 authored by Dave Jones's avatar Dave Jones Committed by Dave Jones

[CPUFREQ] Support for 533 MHz FSB in speedstep driver.

parent 878a23b1
......@@ -106,14 +106,45 @@ static unsigned int pentium3_get_frequency (unsigned int processor)
static unsigned int pentium4_get_frequency(void)
{
u32 msr_lo, msr_hi;
struct cpuinfo_x86 *c = &boot_cpu_data;
u32 msr_lo, msr_hi, mult;
unsigned int fsb = 0;
rdmsr(0x2c, msr_lo, msr_hi);
dprintk(KERN_DEBUG "speedstep-lib: P4 - MSR_EBC_FREQUENCY_ID: 0x%x 0x%x\n", msr_lo, msr_hi);
msr_lo >>= 24;
return (msr_lo * 100000);
/* 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. */
mult = msr_lo >> 24;
dprintk(KERN_DEBUG "speedstep-lib: P4 - FSB %u kHz; Multiplier %u\n", fsb, mult);
return (fsb * mult);
}
......
......@@ -15,7 +15,7 @@
#define SPEEDSTEP_PROCESSOR_PIII_C_EARLY 0x00000001 /* Coppermine core */
#define SPEEDSTEP_PROCESSOR_PIII_C 0x00000002 /* Coppermine core */
#define SPEEDSTEP_PROCESSOR_PIII_T 0x00000003 /* Tualatin core */
#define SPEEDSTEP_PROCESSOR_P4M 0x00000004 /* P4-M with 100 MHz FSB */
#define SPEEDSTEP_PROCESSOR_P4M 0x00000004 /* P4-M */
/* speedstep states -- only two of them */
......
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