From: Dominik Brodowski <linux@brodo.de>
To: torvalds@transmeta.com, linux-kernel@vger.kernel.org
Cc: hpa@zytor.com, cpufreq@www.linux.org.uk
Subject: [2.5.39] (2/5) CPUfreq i386 core
Date: Sat, 28 Sep 2002 11:23:15 +0200 [thread overview]
Message-ID: <20020928112315.C1217@brodo.de> (raw)
CPUFreq i386 core for 2.5.39:
arch/i386/kernel/i386_ksyms.c export cpu_khz
arch/i386/kernel/time.c update various i386 values on frequency
changes
include/asm-i386/msr.h add Transmeta MSR defines
diff -ruN linux-2539original/arch/i386/kernel/i386_ksyms.c linux/arch/i386/kernel/i386_ksyms.c
--- linux-2539original/arch/i386/kernel/i386_ksyms.c Sun Sep 22 09:00:00 2002
+++ linux/arch/i386/kernel/i386_ksyms.c Sat Sep 28 09:30:00 2002
@@ -50,6 +50,7 @@
EXPORT_SYMBOL(drive_info);
#endif
+extern unsigned long cpu_khz;
extern unsigned long get_cmos_time(void);
/* platform dependent support */
@@ -80,6 +81,7 @@
EXPORT_SYMBOL(pm_idle);
EXPORT_SYMBOL(pm_power_off);
EXPORT_SYMBOL(get_cmos_time);
+EXPORT_SYMBOL(cpu_khz);
EXPORT_SYMBOL(apm_info);
#ifdef CONFIG_DEBUG_IOVIRT
diff -ruN linux-2539original/arch/i386/kernel/time.c linux/arch/i386/kernel/time.c
--- linux-2539original/arch/i386/kernel/time.c Sun Sep 22 09:00:00 2002
+++ linux/arch/i386/kernel/time.c Sat Sep 28 09:30:00 2002
@@ -43,6 +43,7 @@
#include <linux/smp.h>
#include <linux/module.h>
#include <linux/device.h>
+#include <linux/cpufreq.h>
#include <asm/io.h>
#include <asm/smp.h>
@@ -603,6 +604,52 @@
device_initcall(time_init_device);
+
+#ifdef CONFIG_CPU_FREQ
+
+static int
+time_cpufreq_notifier(struct notifier_block *nb, unsigned long val,
+ void *data)
+{
+ struct cpufreq_freqs *freq = data;
+ unsigned int i;
+
+ if (!cpu_has_tsc)
+ return 0;
+
+ switch (val) {
+ case CPUFREQ_PRECHANGE:
+ if ((freq->old < freq->new) &&
+ ((freq->cpu == CPUFREQ_ALL_CPUS) || (freq->cpu == 0))) {
+ cpu_khz = cpufreq_scale(cpu_khz, freq->old, freq->new);
+ fast_gettimeoffset_quotient = cpufreq_scale(fast_gettimeoffset_quotient, freq->new, freq->old);
+ }
+ for (i=0; i<NR_CPUS; i++)
+ if ((freq->cpu == CPUFREQ_ALL_CPUS) || (freq->cpu == i))
+ cpu_data[i].loops_per_jiffy = cpufreq_scale(loops_per_jiffy, freq->old, freq->new);
+ break;
+
+ case CPUFREQ_POSTCHANGE:
+ if ((freq->new < freq->old) &&
+ ((freq->cpu == CPUFREQ_ALL_CPUS) || (freq->cpu == 0))) {
+ cpu_khz = cpufreq_scale(cpu_khz, freq->old, freq->new);
+ fast_gettimeoffset_quotient = cpufreq_scale(fast_gettimeoffset_quotient, freq->new, freq->old);
+ }
+ for (i=0; i<NR_CPUS; i++)
+ if ((freq->cpu == CPUFREQ_ALL_CPUS) || (freq->cpu == i))
+ cpu_data[i].loops_per_jiffy = cpufreq_scale(loops_per_jiffy, freq->old, freq->new);
+ break;
+ }
+
+ return 0;
+}
+
+static struct notifier_block time_cpufreq_notifier_block = {
+ notifier_call: time_cpufreq_notifier
+};
+#endif
+
+
void __init time_init(void)
{
#ifdef CONFIG_X86_TSC
@@ -665,6 +712,9 @@
"0" (eax), "1" (edx));
printk("Detected %lu.%03lu MHz processor.\n", cpu_khz / 1000, cpu_khz % 1000);
}
+#ifdef CONFIG_CPU_FREQ
+ cpufreq_register_notifier(&time_cpufreq_notifier_block, CPUFREQ_TRANSITION_NOTIFIER);
+#endif
}
}
#endif /* CONFIG_X86_TSC */
diff -ruN linux-2539original/include/asm-i386/msr.h linux/include/asm-i386/msr.h
--- linux-2539original/include/asm-i386/msr.h Sun Sep 22 09:00:00 2002
+++ linux/include/asm-i386/msr.h Sat Sep 28 09:30:00 2002
@@ -125,4 +125,10 @@
#define MSR_VIA_LONGHAUL 0x110a
#define MSR_VIA_BCR2 0x1147
+/* Transmeta defined MSRs */
+#define MSR_TMTA_LONGRUN_CTRL 0x80868010
+#define MSR_TMTA_LONGRUN_FLAGS 0x80868011
+#define MSR_TMTA_LRTI_READOUT 0x80868018
+#define MSR_TMTA_LRTI_VOLT_MHZ 0x8086801a
+
#endif /* __ASM_MSR_H */
reply other threads:[~2002-09-28 9:28 UTC|newest]
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