94 lines
2.9 KiB
Diff
94 lines
2.9 KiB
Diff
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# HG changeset 15189 patch
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# User kfraser@localhost.localdomain
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# Node ID 2d7d33ac982a0720408d841b13c3b97a2190eae4
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# Parent ae073ca6eb76f75a73063ba6e0f944b47b8f8954
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Add support for ACPI PM Timer as platform clock source.
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Signed-off-by: Keir Fraser <keir@xensource.com>
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Index: 2007-05-14/xen/arch/x86/time.c
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===================================================================
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--- 2007-05-14.orig/xen/arch/x86/time.c 2007-04-23 10:01:42.000000000 +0200
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+++ 2007-05-14/xen/arch/x86/time.c 2007-07-02 10:47:59.000000000 +0200
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@@ -511,6 +511,60 @@ static int init_cyclone(void)
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}
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/************************************************************
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+ * PLATFORM TIMER 4: ACPI PM TIMER
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+ */
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+
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+u32 pmtmr_ioport;
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+
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+/* Protected by platform_timer_lock. */
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+static u64 pmtimer_counter64;
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+static u32 pmtimer_stamp;
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+static struct timer pmtimer_overflow_timer;
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+
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+/* ACPI PM timer ticks at 3.579545 MHz. */
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+#define ACPI_PM_FREQUENCY 3579545
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+
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+/* Deltas are 24-bit unsigned values, as counter may be only 24 bits wide. */
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+#define pmtimer_delta(c) ((u32)(((c) - pmtimer_stamp) & ((1U<<24)-1)))
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+
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+static void pmtimer_overflow(void *unused)
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+{
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+ u32 counter;
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+
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+ spin_lock_irq(&platform_timer_lock);
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+ counter = inl(pmtmr_ioport);
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+ pmtimer_counter64 += pmtimer_delta(counter);
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+ pmtimer_stamp = counter;
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+ spin_unlock_irq(&platform_timer_lock);
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+
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+ /* Trigger overflow avoidance roughly when counter increments 2^23. */
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+ set_timer(&pmtimer_overflow_timer, NOW() + MILLISECS(2000));
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+}
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+
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+static u64 read_pmtimer_count(void)
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+{
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+ return pmtimer_counter64 + pmtimer_delta(inl(pmtmr_ioport));
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+}
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+
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+static int init_pmtimer(void)
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+{
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+ if ( pmtmr_ioport == 0 )
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+ return 0;
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+
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+ read_platform_count = read_pmtimer_count;
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+
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+ init_timer(&pmtimer_overflow_timer, pmtimer_overflow, NULL, 0);
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+ pmtimer_overflow(NULL);
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+ platform_timer_stamp = pmtimer_counter64;
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+ set_time_scale(&platform_timer_scale, ACPI_PM_FREQUENCY);
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+
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+ printk("Platform timer is %s ACPI PM Timer\n",
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+ freq_string(ACPI_PM_FREQUENCY));
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+
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+ return 1;
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+}
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+
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+/************************************************************
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* GENERIC PLATFORM TIMER INFRASTRUCTURE
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*/
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@@ -549,7 +603,7 @@ static void platform_time_calibration(vo
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static void init_platform_timer(void)
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{
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- if ( !init_cyclone() && !init_hpet() )
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+ if ( !init_cyclone() && !init_hpet() && !init_pmtimer() )
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init_pit();
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}
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Index: 2007-05-14/xen/include/asm-x86/config.h
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===================================================================
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--- 2007-05-14.orig/xen/include/asm-x86/config.h 2007-04-23 10:01:46.000000000 +0200
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+++ 2007-05-14/xen/include/asm-x86/config.h 2007-07-02 10:47:59.000000000 +0200
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@@ -22,6 +22,7 @@
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#define CONFIG_X86_LOCAL_APIC 1
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#define CONFIG_X86_GOOD_APIC 1
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#define CONFIG_X86_IO_APIC 1
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+#define CONFIG_X86_PM_TIMER 1
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#define CONFIG_HPET_TIMER 1
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#define CONFIG_X86_MCE_P4THERMAL 1
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#define CONFIG_ACPI_NUMA 1
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