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authorThomas Gleixner <tglx@linutronix.de>2007-10-12 23:04:06 +0200
committerThomas Gleixner <tglx@inhelltoy.tec.linutronix.de>2007-10-12 23:04:06 +0200
commitd371698efd45c3664fd1726780c360f02e1f9580 (patch)
treef6c45126c49f35a62520b89d1bc74fca1a6f9ff9 /arch/x86/kernel/tsc_64.c
parentx86_64: Select clocksource watchdog in Kconfig (diff)
downloadlinux-d371698efd45c3664fd1726780c360f02e1f9580.tar.xz
linux-d371698efd45c3664fd1726780c360f02e1f9580.zip
x86_64: Consolidate tsc calibration
Move the TSC calibration code to tsc.c. Reimplement it so the pm timer can be used as a reference as well. Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: Chris Wright <chrisw@sous-sol.org> Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Arjan van de Ven <arjan@linux.intel.com>
Diffstat (limited to 'arch/x86/kernel/tsc_64.c')
-rw-r--r--arch/x86/kernel/tsc_64.c90
1 files changed, 90 insertions, 0 deletions
diff --git a/arch/x86/kernel/tsc_64.c b/arch/x86/kernel/tsc_64.c
index 2a59bde663f2..59baecd135ab 100644
--- a/arch/x86/kernel/tsc_64.c
+++ b/arch/x86/kernel/tsc_64.c
@@ -6,7 +6,9 @@
#include <linux/time.h>
#include <linux/acpi.h>
#include <linux/cpufreq.h>
+#include <linux/acpi_pmtmr.h>
+#include <asm/hpet.h>
#include <asm/timex.h>
static int notsc __initdata = 0;
@@ -118,6 +120,94 @@ core_initcall(cpufreq_tsc);
#endif
+#define MAX_RETRIES 5
+#define SMI_TRESHOLD 50000
+
+/*
+ * Read TSC and the reference counters. Take care of SMI disturbance
+ */
+static unsigned long __init tsc_read_refs(unsigned long *pm,
+ unsigned long *hpet)
+{
+ unsigned long t1, t2;
+ int i;
+
+ for (i = 0; i < MAX_RETRIES; i++) {
+ t1 = get_cycles_sync();
+ if (hpet)
+ *hpet = hpet_readl(HPET_COUNTER) & 0xFFFFFFFF;
+ else
+ *pm = acpi_pm_read_early();
+ t2 = get_cycles_sync();
+ if ((t2 - t1) < SMI_TRESHOLD)
+ return t2;
+ }
+ return ULONG_MAX;
+}
+
+/**
+ * tsc_calibrate - calibrate the tsc on boot
+ */
+void __init tsc_calibrate(void)
+{
+ unsigned long flags, tsc1, tsc2, tr1, tr2, pm1, pm2, hpet1, hpet2;
+ int hpet = is_hpet_enabled();
+
+ local_irq_save(flags);
+
+ tsc1 = tsc_read_refs(&pm1, hpet ? &hpet1 : NULL);
+
+ outb((inb(0x61) & ~0x02) | 0x01, 0x61);
+
+ outb(0xb0, 0x43);
+ outb((CLOCK_TICK_RATE / (1000 / 50)) & 0xff, 0x42);
+ outb((CLOCK_TICK_RATE / (1000 / 50)) >> 8, 0x42);
+ tr1 = get_cycles_sync();
+ while ((inb(0x61) & 0x20) == 0);
+ tr2 = get_cycles_sync();
+
+ tsc2 = tsc_read_refs(&pm2, hpet ? &hpet2 : NULL);
+
+ local_irq_restore(flags);
+
+ /*
+ * Preset the result with the raw and inaccurate PIT
+ * calibration value
+ */
+ tsc_khz = (tr2 - tr1) / 50;
+
+ /* hpet or pmtimer available ? */
+ if (!hpet && !pm1 && !pm2) {
+ printk(KERN_INFO "TSC calibrated against PIT\n");
+ return;
+ }
+
+ /* Check, whether the sampling was disturbed by an SMI */
+ if (tsc1 == ULONG_MAX || tsc2 == ULONG_MAX) {
+ printk(KERN_WARNING "TSC calibration disturbed by SMI, "
+ "using PIT calibration result\n");
+ return;
+ }
+
+ tsc2 = (tsc2 - tsc1) * 1000000L;
+
+ if (hpet) {
+ printk(KERN_INFO "TSC calibrated against HPET\n");
+ if (hpet2 < hpet1)
+ hpet2 += 0x100000000;
+ hpet2 -= hpet1;
+ tsc1 = (hpet2 * hpet_readl(HPET_PERIOD)) / 1000000;
+ } else {
+ printk(KERN_INFO "TSC calibrated against PM_TIMER\n");
+ if (pm2 < pm1)
+ pm2 += ACPI_PM_OVRRUN;
+ pm2 -= pm1;
+ tsc1 = (pm2 * 1000000000) / PMTMR_TICKS_PER_SEC;
+ }
+
+ tsc_khz = tsc2 / tsc1;
+}
+
/*
* Make an educated guess if the TSC is trustworthy and synchronized
* over all CPUs.