*/
#include <linux/kernel.h>
-#include <linux/module.h>
+#include <linux/module.h>
#include <linux/init.h>
#include <linux/slab.h>
#include <linux/cpufreq.h>
#include <asm/processor.h>
#include <asm/timex.h>
+#define dprintk(msg...) cpufreq_debug_printk(CPUFREQ_DEBUG_DRIVER, "longrun", msg)
+
static struct cpufreq_driver longrun_driver;
/**
- * longrun_{low,high}_freq is needed for the conversion of cpufreq kHz
+ * longrun_{low,high}_freq is needed for the conversion of cpufreq kHz
* values into per cent values. In TMTA microcode, the following is valid:
* performance_pctg = (current_freq - low_freq)/(high_freq - low_freq)
*/
u32 msr_lo, msr_hi;
rdmsr(MSR_TMTA_LONGRUN_FLAGS, msr_lo, msr_hi);
+ dprintk("longrun flags are %x - %x\n", msr_lo, msr_hi);
if (msr_lo & 0x01)
policy->policy = CPUFREQ_POLICY_PERFORMANCE;
else
policy->policy = CPUFREQ_POLICY_POWERSAVE;
-
+
rdmsr(MSR_TMTA_LONGRUN_CTRL, msr_lo, msr_hi);
+ dprintk("longrun ctrl is %x - %x\n", msr_lo, msr_hi);
msr_lo &= 0x0000007F;
msr_hi &= 0x0000007F;
-
+
if ( longrun_high_freq <= longrun_low_freq ) {
/* Assume degenerate Longrun table */
policy->min = policy->max = longrun_high_freq;
} else {
- policy->min = longrun_low_freq + msr_lo *
+ policy->min = longrun_low_freq + msr_lo *
((longrun_high_freq - longrun_low_freq) / 100);
- policy->max = longrun_low_freq + msr_hi *
+ policy->max = longrun_low_freq + msr_hi *
((longrun_high_freq - longrun_low_freq) / 100);
}
policy->cpu = 0;
/* Assume degenerate Longrun table */
pctg_lo = pctg_hi = 100;
} else {
- pctg_lo = (policy->min - longrun_low_freq) /
+ pctg_lo = (policy->min - longrun_low_freq) /
((longrun_high_freq - longrun_low_freq) / 100);
- pctg_hi = (policy->max - longrun_low_freq) /
+ pctg_hi = (policy->max - longrun_low_freq) /
((longrun_high_freq - longrun_low_freq) / 100);
}
* longrun_verify_poliy - verifies a new CPUFreq policy
* @policy: the policy to verify
*
- * Validates a new CPUFreq policy. This function has to be called with
+ * Validates a new CPUFreq policy. This function has to be called with
* cpufreq_driver locked.
*/
static int longrun_verify_policy(struct cpufreq_policy *policy)
return -EINVAL;
policy->cpu = 0;
- cpufreq_verify_within_limits(policy,
- policy->cpuinfo.min_freq,
+ cpufreq_verify_within_limits(policy,
+ policy->cpuinfo.min_freq,
policy->cpuinfo.max_freq);
if ((policy->policy != CPUFREQ_POLICY_POWERSAVE) &&
return 0;
cpuid(0x80860007, &eax, &ebx, &ecx, &edx);
+ dprintk("cpuid eax is %u\n", eax);
return (eax * 1000);
}
* TMTA rules:
* performance_pctg = (target_freq - low_freq)/(high_freq - low_freq)
*/
-static unsigned int __init longrun_determine_freqs(unsigned int *low_freq,
+static unsigned int __init longrun_determine_freqs(unsigned int *low_freq,
unsigned int *high_freq)
{
u32 msr_lo, msr_hi;
if (cpu_has(c, X86_FEATURE_LRTI)) {
/* if the LongRun Table Interface is present, the
- * detection is a bit easier:
+ * detection is a bit easier:
* For minimum frequency, read out the maximum
- * level (msr_hi), write that into "currently
+ * level (msr_hi), write that into "currently
* selected level", and read out the frequency.
* For maximum frequency, read out level zero.
*/
rdmsr(MSR_TMTA_LRTI_VOLT_MHZ, msr_lo, msr_hi);
*high_freq = msr_lo * 1000; /* to kHz */
+ dprintk("longrun table interface told %u - %u kHz\n", *low_freq, *high_freq);
+
if (*low_freq > *high_freq)
*low_freq = *high_freq;
return 0;
/* set the upper border to the value determined during TSC init */
*high_freq = (cpu_khz / 1000);
*high_freq = *high_freq * 1000;
+ dprintk("high frequency is %u kHz\n", *high_freq);
/* get current borders */
rdmsr(MSR_TMTA_LONGRUN_CTRL, msr_lo, msr_hi);
cpuid(0x80860007, &eax, &ebx, &ecx, &edx);
/* restore values */
- wrmsr(MSR_TMTA_LONGRUN_CTRL, save_lo, save_hi);
+ wrmsr(MSR_TMTA_LONGRUN_CTRL, save_lo, save_hi);
}
+ dprintk("percentage is %u %%, freq is %u MHz\n", ecx, eax);
/* performance_pctg = (current_freq - low_freq)/(high_freq - low_freq)
* eqals
if ((ecx > 95) || (ecx == 0) || (eax < ebx))
return -EIO;
- edx = (eax - ebx) / (100 - ecx);
+ edx = (eax - ebx) / (100 - ecx);
*low_freq = edx * 1000; /* back to kHz */
+ dprintk("low frequency is %u kHz\n", *low_freq);
+
if (*low_freq > *high_freq)
*low_freq = *high_freq;
static int __init longrun_cpu_init(struct cpufreq_policy *policy)
{
- int result = 0;
+ int result = 0;
/* capability check */
if (policy->cpu != 0)
policy->cpuinfo.max_freq = longrun_high_freq;
policy->cpuinfo.transition_latency = CPUFREQ_ETERNAL;
longrun_get_policy(policy);
-
+
return 0;
}
static struct cpufreq_driver longrun_driver = {
.flags = CPUFREQ_CONST_LOOPS,
- .verify = longrun_verify_policy,
- .setpolicy = longrun_set_policy,
+ .verify = longrun_verify_policy,
+ .setpolicy = longrun_set_policy,
.get = longrun_get,
.init = longrun_cpu_init,
.name = "longrun",
{
struct cpuinfo_x86 *c = cpu_data;
- if (c->x86_vendor != X86_VENDOR_TRANSMETA ||
+ if (c->x86_vendor != X86_VENDOR_TRANSMETA ||
!cpu_has(c, X86_FEATURE_LONGRUN))
return -ENODEV;
MODULE_AUTHOR ("Dominik Brodowski <linux@brodo.de>");
-MODULE_DESCRIPTION ("LongRun driver for Transmeta Crusoe processors.");
+MODULE_DESCRIPTION ("LongRun driver for Transmeta Crusoe and Efficeon processors.");
MODULE_LICENSE ("GPL");
module_init(longrun_init);
git://git.onelab.eu / linux-2.6.git / blobdiff