The patch titled
clockevents: convert HPET to clockevents
has been added to the -mm tree. Its filename is
clockevents-convert-hpet-to-clockevents.patch
See http://www.zip.com.au/~akpm/linux/patches/stuff/added-to-mm.txt to find
out what to do about this
------------------------------------------------------
Subject: clockevents: convert HPET to clockevents
From: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Convert HPET to clockevents. Integrate the HPET clocksource and the timer
related code into one file. Keep existing non-high-res functionality
unchanged.
Signed-off-by: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Signed-off-by: Ingo Molnar <mingo@xxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxx>
---
arch/i386/kernel/Makefile | 1
arch/i386/kernel/hpet.c | 489 +++++++++++++++++++++++++++++++--
arch/i386/kernel/i8259.c | 6
arch/i386/kernel/time.c | 20 -
arch/i386/kernel/time_hpet.c | 470 -------------------------------
include/asm-i386/hpet.h | 15 -
6 files changed, 484 insertions(+), 517 deletions(-)
diff -puN arch/i386/kernel/Makefile~clockevents-convert-hpet-to-clockevents arch/i386/kernel/Makefile
--- a/arch/i386/kernel/Makefile~clockevents-convert-hpet-to-clockevents
+++ a/arch/i386/kernel/Makefile
@@ -32,7 +32,6 @@ obj-$(CONFIG_KPROBES) += kprobes.o
obj-$(CONFIG_MODULES) += module.o
obj-y += sysenter.o vsyscall.o
obj-$(CONFIG_ACPI_SRAT) += srat.o
-obj-$(CONFIG_HPET_TIMER) += time_hpet.o
obj-$(CONFIG_EFI) += efi.o efi_stub.o
obj-$(CONFIG_DOUBLEFAULT) += doublefault.o
obj-$(CONFIG_VM86) += vm86.o
diff -puN arch/i386/kernel/hpet.c~clockevents-convert-hpet-to-clockevents arch/i386/kernel/hpet.c
--- a/arch/i386/kernel/hpet.c~clockevents-convert-hpet-to-clockevents
+++ a/arch/i386/kernel/hpet.c
@@ -1,4 +1,5 @@
#include <linux/clocksource.h>
+#include <linux/clockchips.h>
#include <linux/errno.h>
#include <linux/hpet.h>
#include <linux/init.h>
@@ -6,17 +7,272 @@
#include <asm/hpet.h>
#include <asm/io.h>
+extern struct clock_event_device *global_clock_event;
+
#define HPET_MASK CLOCKSOURCE_MASK(32)
#define HPET_SHIFT 22
/* FSEC = 10^-15 NSEC = 10^-9 */
#define FSEC_PER_NSEC 1000000
-static void *hpet_ptr;
+/*
+ * HPET address is set in acpi/boot.c, when an ACPI entry exists
+ */
+unsigned long hpet_address;
+static void __iomem * hpet_virt_address;
+
+static inline unsigned long hpet_readl(unsigned long a)
+{
+ return readl(hpet_virt_address + a);
+}
+
+static inline void hpet_writel(unsigned long d, unsigned long a)
+{
+ writel(d, hpet_virt_address + a);
+}
+
+/*
+ * HPET command line enable / disable
+ */
+static int boot_hpet_disable;
+
+static int __init hpet_setup(char* str)
+{
+ if (str) {
+ if (!strncmp("disable", str, 7))
+ boot_hpet_disable = 1;
+ }
+ return 1;
+}
+__setup("hpet=", hpet_setup);
+
+static inline int is_hpet_capable(void)
+{
+ return (!boot_hpet_disable && hpet_address);
+}
+
+/*
+ * HPET timer interrupt enable / disable
+ */
+static int hpet_legacy_int_enabled;
+
+/**
+ * is_hpet_enabled - check whether the hpet timer interrupt is enabled
+ */
+int is_hpet_enabled(void)
+{
+ return is_hpet_capable() && hpet_legacy_int_enabled;
+}
+
+/*
+ * When the hpet driver (/dev/hpet) is enabled, we need to reserve
+ * timer 0 and timer 1 in case of RTC emulation.
+ */
+#ifdef CONFIG_HPET
+static void hpet_reserve_platform_timers(unsigned long id)
+{
+ struct hpet __iomem *hpet = hpet_virt_address;
+ struct hpet_timer __iomem *timer = &hpet->hpet_timers[2];
+ unsigned int nrtimers, i;
+ struct hpet_data hd;
+
+ nrtimers = ((id & HPET_ID_NUMBER) >> HPET_ID_NUMBER_SHIFT) + 1;
+
+ memset(&hd, 0, sizeof (hd));
+ hd.hd_phys_address = hpet_address;
+ hd.hd_address = hpet_virt_address;
+ hd.hd_nirqs = nrtimers;
+ hd.hd_flags = HPET_DATA_PLATFORM;
+ hpet_reserve_timer(&hd, 0);
+
+#ifdef CONFIG_HPET_EMULATE_RTC
+ hpet_reserve_timer(&hd, 1);
+#endif
+
+ hd.hd_irq[0] = HPET_LEGACY_8254;
+ hd.hd_irq[1] = HPET_LEGACY_RTC;
+
+ for (i = 2; i < nrtimers; timer++, i++)
+ hd.hd_irq[i] = (timer->hpet_config & Tn_INT_ROUTE_CNF_MASK) >>
+ Tn_INT_ROUTE_CNF_SHIFT;
+
+ hpet_alloc(&hd);
+
+}
+#else
+static void hpet_reserve_platform_timers(unsigned long id) { }
+#endif
+
+/*
+ * Common hpet info
+ */
+static unsigned long hpet_period;
+
+static void hpet_set_mode(enum clock_event_mode mode,
+ struct clock_event_device *evt);
+static void hpet_next_event(unsigned long delta,
+ struct clock_event_device *evt);
+
+/*
+ * The hpet clock event device
+ */
+static struct clock_event_device hpet_clockevent = {
+ .name = "hpet",
+ .capabilities = CLOCK_CAP_TICK | CLOCK_CAP_PROFILE | CLOCK_CAP_UPDATE
+ | CLOCK_CAP_NEXTEVT,
+ .set_mode = hpet_set_mode,
+ .set_next_event = hpet_next_event,
+ .shift = 32,
+};
+
+static void hpet_start_counter(void)
+{
+ unsigned long cfg = hpet_readl(HPET_CFG);
+
+ cfg &= ~HPET_CFG_ENABLE;
+ hpet_writel(cfg, HPET_CFG);
+ hpet_writel(0, HPET_COUNTER);
+ hpet_writel(0, HPET_COUNTER + 4);
+ cfg |= HPET_CFG_ENABLE;
+ hpet_writel(cfg, HPET_CFG);
+}
+
+static void hpet_enable_int(void)
+{
+ unsigned long cfg = hpet_readl(HPET_CFG);
+
+ cfg |= HPET_CFG_LEGACY;
+ hpet_writel(cfg, HPET_CFG);
+ hpet_legacy_int_enabled = 1;
+}
+
+static void hpet_set_mode(enum clock_event_mode mode,
+ struct clock_event_device *evt)
+{
+ unsigned long cfg, cmp, now;
+ uint64_t delta;
+
+ switch(mode) {
+ case CLOCK_EVT_PERIODIC:
+ delta = ((uint64_t)(NSEC_PER_SEC/HZ)) * hpet_clockevent.mult;
+ delta >>= hpet_clockevent.shift;
+ now = hpet_readl(HPET_COUNTER);
+ cmp = now + (unsigned long) delta;
+ cfg = hpet_readl(HPET_T0_CFG);
+ cfg |= HPET_TN_ENABLE | HPET_TN_PERIODIC |
+ HPET_TN_SETVAL | HPET_TN_32BIT;
+ hpet_writel(cfg, HPET_T0_CFG);
+ /*
+ * The first write after writing TN_SETVAL to the
+ * config register sets the counter value, the second
+ * write sets the period.
+ */
+ hpet_writel(cmp, HPET_T0_CMP);
+ udelay(1);
+ hpet_writel((unsigned long) delta, HPET_T0_CMP);
+ break;
+
+ case CLOCK_EVT_ONESHOT:
+ cfg = hpet_readl(HPET_T0_CFG);
+ cfg &= ~HPET_TN_PERIODIC;
+ cfg |= HPET_TN_ENABLE | HPET_TN_32BIT;
+ hpet_writel(cfg, HPET_T0_CFG);
+ break;
+
+ case CLOCK_EVT_SHUTDOWN:
+ cfg = hpet_readl(HPET_T0_CFG);
+ cfg &= ~HPET_TN_ENABLE;
+ hpet_writel(cfg, HPET_T0_CFG);
+ break;
+ }
+}
+
+static void hpet_next_event(unsigned long delta,
+ struct clock_event_device *evt)
+{
+ unsigned long cnt;
+ do {
+ cnt = hpet_readl(HPET_COUNTER);
+ cnt += delta;
+ hpet_writel(cnt, HPET_T0_CMP);
+ } while ((long)(hpet_readl(HPET_COUNTER) - cnt ) > 0);
+}
+
+/*
+ * Try to setup the HPET timer
+ */
+int __init hpet_enable(void)
+{
+ unsigned long id;
+ uint64_t hpet_freq;
+
+ if (!is_hpet_capable())
+ return 0;
+
+ hpet_virt_address = ioremap_nocache(hpet_address, HPET_MMAP_SIZE);
+
+ /*
+ * Read the period and check for a sane value:
+ */
+ hpet_period = hpet_readl(HPET_PERIOD);
+ if (hpet_period < HPET_MIN_PERIOD || hpet_period > HPET_MAX_PERIOD)
+ goto out_nohpet;
+
+ /*
+ * The period is a femto seconds value. We need to calculate the
+ * scaled math multiplication factor for nanosecond to hpet tick
+ * conversion.
+ */
+ hpet_freq = 1000000000000000ULL;
+ do_div(hpet_freq, hpet_period);
+ hpet_clockevent.mult = div_sc((unsigned long) hpet_freq,
+ NSEC_PER_SEC, 32);
+ /* Calculate the min / max delta */
+ hpet_clockevent.max_delta_ns = clockevent_delta2ns(0x7FFFFFFF,
+ &hpet_clockevent);
+ hpet_clockevent.min_delta_ns = clockevent_delta2ns(0x30,
+ &hpet_clockevent);
+
+ /*
+ * Read the HPET ID register to retrieve the IRQ routing
+ * information and the number of channels
+ */
+ id = hpet_readl(HPET_ID);
+
+#ifdef CONFIG_HPET_EMULATE_RTC
+ /*
+ * The legacy routing mode needs at least two channels, tick timer
+ * and the rtc emulation channel.
+ */
+ if (!(id & HPET_ID_NUMBER))
+ goto out_nohpet;
+#endif
+
+ /* Start the counter */
+ hpet_start_counter();
+
+ if (id & HPET_ID_LEGSUP) {
+ hpet_enable_int();
+ hpet_reserve_platform_timers(id);
+ register_global_clockevent(&hpet_clockevent);
+ global_clock_event = &hpet_clockevent;
+ return 1;
+ }
+ return 0;
+
+out_nohpet:
+ iounmap(hpet_virt_address);
+ hpet_virt_address = NULL;
+ return 0;
+}
+
+/*
+ * Clock source related code
+ */
static cycle_t read_hpet(void)
{
- return (cycle_t)readl(hpet_ptr);
+ return (cycle_t)hpet_readl(HPET_COUNTER);
}
static struct clocksource clocksource_hpet = {
@@ -24,29 +280,17 @@ static struct clocksource clocksource_hp
.rating = 250,
.read = read_hpet,
.mask = HPET_MASK,
- .mult = 0, /* set below */
.shift = HPET_SHIFT,
.is_continuous = 1,
};
static int __init init_hpet_clocksource(void)
{
- unsigned long hpet_period;
- void __iomem* hpet_base;
u64 tmp;
- int err;
- if (!is_hpet_enabled())
+ if (!hpet_virt_address)
return -ENODEV;
- /* calculate the hpet address: */
- hpet_base =
- (void __iomem*)ioremap_nocache(hpet_address, HPET_MMAP_SIZE);
- hpet_ptr = hpet_base + HPET_COUNTER;
-
- /* calculate the frequency: */
- hpet_period = readl(hpet_base + HPET_PERIOD);
-
/*
* hpet period is in femto seconds per cycle
* so we need to convert this to ns/cyc units
@@ -62,11 +306,216 @@ static int __init init_hpet_clocksource(
do_div(tmp, FSEC_PER_NSEC);
clocksource_hpet.mult = (u32)tmp;
- err = clocksource_register(&clocksource_hpet);
- if (err)
- iounmap(hpet_base);
-
- return err;
+ return clocksource_register(&clocksource_hpet);
}
module_init(init_hpet_clocksource);
+
+#ifdef CONFIG_HPET_EMULATE_RTC
+
+/* HPET in LegacyReplacement Mode eats up RTC interrupt line. When, HPET
+ * is enabled, we support RTC interrupt functionality in software.
+ * RTC has 3 kinds of interrupts:
+ * 1) Update Interrupt - generate an interrupt, every sec, when RTC clock
+ * is updated
+ * 2) Alarm Interrupt - generate an interrupt at a specific time of day
+ * 3) Periodic Interrupt - generate periodic interrupt, with frequencies
+ * 2Hz-8192Hz (2Hz-64Hz for non-root user) (all freqs in powers of 2)
+ * (1) and (2) above are implemented using polling at a frequency of
+ * 64 Hz. The exact frequency is a tradeoff between accuracy and interrupt
+ * overhead. (DEFAULT_RTC_INT_FREQ)
+ * For (3), we use interrupts at 64Hz or user specified periodic
+ * frequency, whichever is higher.
+ */
+#include <linux/mc146818rtc.h>
+#include <linux/rtc.h>
+
+#define DEFAULT_RTC_INT_FREQ 64
+#define DEFAULT_RTC_SHIFT 6
+#define RTC_NUM_INTS 1
+
+static unsigned long hpet_rtc_flags;
+static unsigned long hpet_prev_update_sec;
+static struct rtc_time hpet_alarm_time;
+static unsigned long hpet_pie_count;
+static unsigned long hpet_t1_cmp;
+static unsigned long hpet_default_delta;
+static unsigned long hpet_pie_delta;
+static unsigned long hpet_pie_limit;
+
+/*
+ * Timer 1 for RTC emulation. We use one shot mode, as periodic mode
+ * is not supported by all HPET implementations for timer 1.
+ *
+ * hpet_rtc_timer_init() is called when the rtc is initialized.
+ */
+int hpet_rtc_timer_init(void)
+{
+ unsigned long cfg, cnt, delta, flags;
+
+ if (!is_hpet_enabled())
+ return 0;
+
+ if (!hpet_default_delta) {
+ uint64_t clc;
+
+ clc = (uint64_t) hpet_clockevent.mult * NSEC_PER_SEC;
+ clc >>= hpet_clockevent.shift + DEFAULT_RTC_SHIFT;
+ hpet_default_delta = (unsigned long) clc;
+ }
+
+ if (!(hpet_rtc_flags & RTC_PIE) || hpet_pie_limit)
+ delta = hpet_default_delta;
+ else
+ delta = hpet_pie_delta;
+
+ local_irq_save(flags);
+
+ cnt = delta + hpet_readl(HPET_COUNTER);
+ hpet_writel(cnt, HPET_T1_CMP);
+ hpet_t1_cmp = cnt;
+
+ cfg = hpet_readl(HPET_T1_CFG);
+ cfg &= ~HPET_TN_PERIODIC;
+ cfg |= HPET_TN_ENABLE | HPET_TN_32BIT;
+ hpet_writel(cfg, HPET_T1_CFG);
+
+ local_irq_restore(flags);
+
+ return 1;
+}
+
+/*
+ * The functions below are called from rtc driver.
+ * Return 0 if HPET is not being used.
+ * Otherwise do the necessary changes and return 1.
+ */
+int hpet_mask_rtc_irq_bit(unsigned long bit_mask)
+{
+ if (!is_hpet_enabled())
+ return 0;
+
+ hpet_rtc_flags &= ~bit_mask;
+ return 1;
+}
+
+int hpet_set_rtc_irq_bit(unsigned long bit_mask)
+{
+ unsigned long oldbits = hpet_rtc_flags;
+
+ if (!is_hpet_enabled())
+ return 0;
+
+ hpet_rtc_flags |= bit_mask;
+
+ if (!oldbits)
+ hpet_rtc_timer_init();
+
+ return 1;
+}
+
+int hpet_set_alarm_time(unsigned char hrs, unsigned char min,
+ unsigned char sec)
+{
+ if (!is_hpet_enabled())
+ return 0;
+
+ hpet_alarm_time.tm_hour = hrs;
+ hpet_alarm_time.tm_min = min;
+ hpet_alarm_time.tm_sec = sec;
+
+ return 1;
+}
+
+int hpet_set_periodic_freq(unsigned long freq)
+{
+ uint64_t clc;
+
+ if (!is_hpet_enabled())
+ return 0;
+
+ if (freq <= DEFAULT_RTC_INT_FREQ)
+ hpet_pie_limit = DEFAULT_RTC_INT_FREQ / freq;
+ else {
+ clc = (uint64_t) hpet_clockevent.mult * NSEC_PER_SEC;
+ do_div(clc, freq);
+ clc >>= hpet_clockevent.shift;
+ hpet_pie_delta = (unsigned long) clc;
+ }
+ return 1;
+}
+
+int hpet_rtc_dropped_irq(void)
+{
+ return is_hpet_enabled();
+}
+
+static void hpet_rtc_timer_reinit(void)
+{
+ unsigned long cfg, delta;
+ int lost_ints = -1;
+
+ if (unlikely(!hpet_rtc_flags)) {
+ cfg = hpet_readl(HPET_T1_CFG);
+ cfg &= ~HPET_TN_ENABLE;
+ hpet_writel(cfg, HPET_T1_CFG);
+ return;
+ }
+
+ if (!(hpet_rtc_flags & RTC_PIE) || hpet_pie_limit)
+ delta = hpet_default_delta;
+ else
+ delta = hpet_pie_delta;
+
+ /*
+ * Increment the comparator value until we are ahead of the
+ * current count.
+ */
+ do {
+ hpet_t1_cmp += delta;
+ hpet_writel(hpet_t1_cmp, HPET_T1_CMP);
+ lost_ints++;
+ } while ((long)(hpet_readl(HPET_COUNTER) - hpet_t1_cmp) > 0);
+
+ if (lost_ints) {
+ if (hpet_rtc_flags & RTC_PIE)
+ hpet_pie_count += lost_ints;
+ printk(KERN_WARNING "rtc: lost %d interrupts\n", lost_ints);
+ }
+}
+
+irqreturn_t hpet_rtc_interrupt(int irq, void *dev_id)
+{
+ struct rtc_time curr_time;
+ unsigned long rtc_int_flag = 0;
+
+ hpet_rtc_timer_reinit();
+
+ if (hpet_rtc_flags & (RTC_UIE | RTC_AIE))
+ rtc_get_rtc_time(&curr_time);
+
+ if (hpet_rtc_flags & RTC_UIE &&
+ curr_time.tm_sec != hpet_prev_update_sec) {
+ rtc_int_flag = RTC_UF;
+ hpet_prev_update_sec = curr_time.tm_sec;
+ }
+
+ if (hpet_rtc_flags & RTC_PIE &&
+ ++hpet_pie_count >= hpet_pie_limit) {
+ rtc_int_flag |= RTC_PF;
+ hpet_pie_count = 0;
+ }
+
+ if (hpet_rtc_flags & RTC_PIE &&
+ (curr_time.tm_sec == hpet_alarm_time.tm_sec) &&
+ (curr_time.tm_min == hpet_alarm_time.tm_min) &&
+ (curr_time.tm_hour == hpet_alarm_time.tm_hour))
+ rtc_int_flag |= RTC_AF;
+
+ if (rtc_int_flag) {
+ rtc_int_flag |= (RTC_IRQF | (RTC_NUM_INTS << 8));
+ rtc_interrupt(rtc_int_flag, dev_id);
+ }
+ return IRQ_HANDLED;
+}
+#endif
diff -puN arch/i386/kernel/i8259.c~clockevents-convert-hpet-to-clockevents arch/i386/kernel/i8259.c
--- a/arch/i386/kernel/i8259.c~clockevents-convert-hpet-to-clockevents
+++ a/arch/i386/kernel/i8259.c
@@ -410,12 +410,6 @@ void __init native_init_IRQ(void)
intr_init_hook();
/*
- * Set the clock to HZ Hz, we already have a valid
- * vector now:
- */
- setup_pit_timer();
-
- /*
* External FPU? Set up irq13 if so, for
* original braindamaged IBM FERR coupling.
*/
diff -puN arch/i386/kernel/time.c~clockevents-convert-hpet-to-clockevents arch/i386/kernel/time.c
--- a/arch/i386/kernel/time.c~clockevents-convert-hpet-to-clockevents
+++ a/arch/i386/kernel/time.c
@@ -260,30 +260,16 @@ void notify_arch_cmos_timer(void)
mod_timer(&sync_cmos_timer, jiffies + 1);
}
-#ifdef CONFIG_HPET_TIMER
extern void (*late_time_init)(void);
/* Duplicate of time_init() below, with hpet_enable part added */
static void __init hpet_time_init(void)
{
- if ((hpet_enable() >= 0) && hpet_use_timer) {
- printk("Using HPET for base-timer\n");
- }
-
+ if (!hpet_enable())
+ setup_pit_timer();
do_time_init();
}
-#endif
void __init time_init(void)
{
-#ifdef CONFIG_HPET_TIMER
- if (is_hpet_capable()) {
- /*
- * HPET initialization needs to do memory-mapped io. So, let
- * us do a late initialization after mem_init().
- */
- late_time_init = hpet_time_init;
- return;
- }
-#endif
- do_time_init();
+ late_time_init = hpet_time_init;
}
diff -puN arch/i386/kernel/time_hpet.c~clockevents-convert-hpet-to-clockevents /dev/null
--- a/arch/i386/kernel/time_hpet.c
+++ /dev/null
@@ -1,470 +0,0 @@
-/*
- * linux/arch/i386/kernel/time_hpet.c
- * This code largely copied from arch/x86_64/kernel/time.c
- * See that file for credits.
- *
- * 2003-06-30 Venkatesh Pallipadi - Additional changes for HPET support
- */
-
-#include <linux/errno.h>
-#include <linux/kernel.h>
-#include <linux/param.h>
-#include <linux/string.h>
-#include <linux/init.h>
-#include <linux/smp.h>
-
-#include <asm/timer.h>
-#include <asm/fixmap.h>
-#include <asm/apic.h>
-
-#include <linux/timex.h>
-
-#include <asm/hpet.h>
-#include <linux/hpet.h>
-
-static unsigned long hpet_period; /* fsecs / HPET clock */
-unsigned long hpet_tick; /* hpet clks count per tick */
-unsigned long hpet_address; /* hpet memory map physical address */
-int hpet_use_timer;
-
-static int use_hpet; /* can be used for runtime check of hpet */
-static int boot_hpet_disable; /* boottime override for HPET timer */
-static void __iomem * hpet_virt_address; /* hpet kernel virtual address */
-
-#define FSEC_TO_USEC (1000000000UL)
-
-int hpet_readl(unsigned long a)
-{
- return readl(hpet_virt_address + a);
-}
-
-static void hpet_writel(unsigned long d, unsigned long a)
-{
- writel(d, hpet_virt_address + a);
-}
-
-static int hpet_timer_stop_set_go(unsigned long tick)
-{
- unsigned int cfg;
-
- /*
- * Stop the timers and reset the main counter.
- */
- cfg = hpet_readl(HPET_CFG);
- cfg &= ~HPET_CFG_ENABLE;
- hpet_writel(cfg, HPET_CFG);
- hpet_writel(0, HPET_COUNTER);
- hpet_writel(0, HPET_COUNTER + 4);
-
- if (hpet_use_timer) {
- /*
- * Set up timer 0, as periodic with first interrupt to happen at
- * hpet_tick, and period also hpet_tick.
- */
- cfg = hpet_readl(HPET_T0_CFG);
- cfg |= HPET_TN_ENABLE | HPET_TN_PERIODIC |
- HPET_TN_SETVAL | HPET_TN_32BIT;
- hpet_writel(cfg, HPET_T0_CFG);
-
- /*
- * The first write after writing TN_SETVAL to the config register sets
- * the counter value, the second write sets the threshold.
- */
- hpet_writel(tick, HPET_T0_CMP);
- hpet_writel(tick, HPET_T0_CMP);
- }
- /*
- * Go!
- */
- cfg = hpet_readl(HPET_CFG);
- if (hpet_use_timer)
- cfg |= HPET_CFG_LEGACY;
- cfg |= HPET_CFG_ENABLE;
- hpet_writel(cfg, HPET_CFG);
-
- return 0;
-}
-
-/*
- * Check whether HPET was found by ACPI boot parse. If yes setup HPET
- * counter 0 for kernel base timer.
- */
-int __init hpet_enable(void)
-{
- unsigned int id;
- unsigned long tick_fsec_low, tick_fsec_high; /* tick in femto sec */
- unsigned long hpet_tick_rem;
-
- if (boot_hpet_disable)
- return -1;
-
- if (!hpet_address) {
- return -1;
- }
- hpet_virt_address = ioremap_nocache(hpet_address, HPET_MMAP_SIZE);
- /*
- * Read the period, compute tick and quotient.
- */
- id = hpet_readl(HPET_ID);
-
- /*
- * We are checking for value '1' or more in number field if
- * CONFIG_HPET_EMULATE_RTC is set because we will need an
- * additional timer for RTC emulation.
- * However, we can do with one timer otherwise using the
- * the single HPET timer for system time.
- */
-#ifdef CONFIG_HPET_EMULATE_RTC
- if (!(id & HPET_ID_NUMBER)) {
- iounmap(hpet_virt_address);
- hpet_virt_address = NULL;
- return -1;
- }
-#endif
-
-
- hpet_period = hpet_readl(HPET_PERIOD);
- if ((hpet_period < HPET_MIN_PERIOD) || (hpet_period > HPET_MAX_PERIOD)) {
- iounmap(hpet_virt_address);
- hpet_virt_address = NULL;
- return -1;
- }
-
- /*
- * 64 bit math
- * First changing tick into fsec
- * Then 64 bit div to find number of hpet clk per tick
- */
- ASM_MUL64_REG(tick_fsec_low, tick_fsec_high,
- KERNEL_TICK_USEC, FSEC_TO_USEC);
- ASM_DIV64_REG(hpet_tick, hpet_tick_rem,
- hpet_period, tick_fsec_low, tick_fsec_high);
-
- if (hpet_tick_rem > (hpet_period >> 1))
- hpet_tick++; /* rounding the result */
-
- hpet_use_timer = id & HPET_ID_LEGSUP;
-
- if (hpet_timer_stop_set_go(hpet_tick)) {
- iounmap(hpet_virt_address);
- hpet_virt_address = NULL;
- return -1;
- }
-
- use_hpet = 1;
-
-#ifdef CONFIG_HPET
- {
- struct hpet_data hd;
- unsigned int ntimer;
-
- memset(&hd, 0, sizeof (hd));
-
- ntimer = hpet_readl(HPET_ID);
- ntimer = (ntimer & HPET_ID_NUMBER) >> HPET_ID_NUMBER_SHIFT;
- ntimer++;
-
- /*
- * Register with driver.
- * Timer0 and Timer1 is used by platform.
- */
- hd.hd_phys_address = hpet_address;
- hd.hd_address = hpet_virt_address;
- hd.hd_nirqs = ntimer;
- hd.hd_flags = HPET_DATA_PLATFORM;
- hpet_reserve_timer(&hd, 0);
-#ifdef CONFIG_HPET_EMULATE_RTC
- hpet_reserve_timer(&hd, 1);
-#endif
- hd.hd_irq[0] = HPET_LEGACY_8254;
- hd.hd_irq[1] = HPET_LEGACY_RTC;
- if (ntimer > 2) {
- struct hpet __iomem *hpet;
- struct hpet_timer __iomem *timer;
- int i;
-
- hpet = hpet_virt_address;
-
- for (i = 2, timer = &hpet->hpet_timers[2]; i < ntimer;
- timer++, i++)
- hd.hd_irq[i] = (timer->hpet_config &
- Tn_INT_ROUTE_CNF_MASK) >>
- Tn_INT_ROUTE_CNF_SHIFT;
-
- }
-
- hpet_alloc(&hd);
- }
-#endif
- return 0;
-}
-
-int is_hpet_enabled(void)
-{
- return use_hpet;
-}
-
-int is_hpet_capable(void)
-{
- if (!boot_hpet_disable && hpet_address)
- return 1;
- return 0;
-}
-
-static int __init hpet_setup(char* str)
-{
- if (str) {
- if (!strncmp("disable", str, 7))
- boot_hpet_disable = 1;
- }
- return 1;
-}
-
-__setup("hpet=", hpet_setup);
-
-#ifdef CONFIG_HPET_EMULATE_RTC
-/* HPET in LegacyReplacement Mode eats up RTC interrupt line. When, HPET
- * is enabled, we support RTC interrupt functionality in software.
- * RTC has 3 kinds of interrupts:
- * 1) Update Interrupt - generate an interrupt, every sec, when RTC clock
- * is updated
- * 2) Alarm Interrupt - generate an interrupt at a specific time of day
- * 3) Periodic Interrupt - generate periodic interrupt, with frequencies
- * 2Hz-8192Hz (2Hz-64Hz for non-root user) (all freqs in powers of 2)
- * (1) and (2) above are implemented using polling at a frequency of
- * 64 Hz. The exact frequency is a tradeoff between accuracy and interrupt
- * overhead. (DEFAULT_RTC_INT_FREQ)
- * For (3), we use interrupts at 64Hz or user specified periodic
- * frequency, whichever is higher.
- */
-#include <linux/mc146818rtc.h>
-#include <linux/rtc.h>
-
-#define DEFAULT_RTC_INT_FREQ 64
-#define RTC_NUM_INTS 1
-
-static unsigned long UIE_on;
-static unsigned long prev_update_sec;
-
-static unsigned long AIE_on;
-static struct rtc_time alarm_time;
-
-static unsigned long PIE_on;
-static unsigned long PIE_freq = DEFAULT_RTC_INT_FREQ;
-static unsigned long PIE_count;
-
-static unsigned long hpet_rtc_int_freq; /* RTC interrupt frequency */
-static unsigned int hpet_t1_cmp; /* cached comparator register */
-
-/*
- * Timer 1 for RTC, we do not use periodic interrupt feature,
- * even if HPET supports periodic interrupts on Timer 1.
- * The reason being, to set up a periodic interrupt in HPET, we need to
- * stop the main counter. And if we do that everytime someone diables/enables
- * RTC, we will have adverse effect on main kernel timer running on Timer 0.
- * So, for the time being, simulate the periodic interrupt in software.
- *
- * hpet_rtc_timer_init() is called for the first time and during subsequent
- * interuppts reinit happens through hpet_rtc_timer_reinit().
- */
-int hpet_rtc_timer_init(void)
-{
- unsigned int cfg, cnt;
- unsigned long flags;
-
- if (!is_hpet_enabled())
- return 0;
- /*
- * Set the counter 1 and enable the interrupts.
- */
- if (PIE_on && (PIE_freq > DEFAULT_RTC_INT_FREQ))
- hpet_rtc_int_freq = PIE_freq;
- else
- hpet_rtc_int_freq = DEFAULT_RTC_INT_FREQ;
-
- local_irq_save(flags);
-
- cnt = hpet_readl(HPET_COUNTER);
- cnt += ((hpet_tick*HZ)/hpet_rtc_int_freq);
- hpet_writel(cnt, HPET_T1_CMP);
- hpet_t1_cmp = cnt;
-
- cfg = hpet_readl(HPET_T1_CFG);
- cfg &= ~HPET_TN_PERIODIC;
- cfg |= HPET_TN_ENABLE | HPET_TN_32BIT;
- hpet_writel(cfg, HPET_T1_CFG);
-
- local_irq_restore(flags);
-
- return 1;
-}
-
-static void hpet_rtc_timer_reinit(void)
-{
- unsigned int cfg, cnt, ticks_per_int, lost_ints;
-
- if (unlikely(!(PIE_on | AIE_on | UIE_on))) {
- cfg = hpet_readl(HPET_T1_CFG);
- cfg &= ~HPET_TN_ENABLE;
- hpet_writel(cfg, HPET_T1_CFG);
- return;
- }
-
- if (PIE_on && (PIE_freq > DEFAULT_RTC_INT_FREQ))
- hpet_rtc_int_freq = PIE_freq;
- else
- hpet_rtc_int_freq = DEFAULT_RTC_INT_FREQ;
-
- /* It is more accurate to use the comparator value than current count.*/
- ticks_per_int = hpet_tick * HZ / hpet_rtc_int_freq;
- hpet_t1_cmp += ticks_per_int;
- hpet_writel(hpet_t1_cmp, HPET_T1_CMP);
-
- /*
- * If the interrupt handler was delayed too long, the write above tries
- * to schedule the next interrupt in the past and the hardware would
- * not interrupt until the counter had wrapped around.
- * So we have to check that the comparator wasn't set to a past time.
- */
- cnt = hpet_readl(HPET_COUNTER);
- if (unlikely((int)(cnt - hpet_t1_cmp) > 0)) {
- lost_ints = (cnt - hpet_t1_cmp) / ticks_per_int + 1;
- /* Make sure that, even with the time needed to execute
- * this code, the next scheduled interrupt has been moved
- * back to the future: */
- lost_ints++;
-
- hpet_t1_cmp += lost_ints * ticks_per_int;
- hpet_writel(hpet_t1_cmp, HPET_T1_CMP);
-
- if (PIE_on)
- PIE_count += lost_ints;
-
- printk(KERN_WARNING "rtc: lost some interrupts at %ldHz.\n",
- hpet_rtc_int_freq);
- }
-}
-
-/*
- * The functions below are called from rtc driver.
- * Return 0 if HPET is not being used.
- * Otherwise do the necessary changes and return 1.
- */
-int hpet_mask_rtc_irq_bit(unsigned long bit_mask)
-{
- if (!is_hpet_enabled())
- return 0;
-
- if (bit_mask & RTC_UIE)
- UIE_on = 0;
- if (bit_mask & RTC_PIE)
- PIE_on = 0;
- if (bit_mask & RTC_AIE)
- AIE_on = 0;
-
- return 1;
-}
-
-int hpet_set_rtc_irq_bit(unsigned long bit_mask)
-{
- int timer_init_reqd = 0;
-
- if (!is_hpet_enabled())
- return 0;
-
- if (!(PIE_on | AIE_on | UIE_on))
- timer_init_reqd = 1;
-
- if (bit_mask & RTC_UIE) {
- UIE_on = 1;
- }
- if (bit_mask & RTC_PIE) {
- PIE_on = 1;
- PIE_count = 0;
- }
- if (bit_mask & RTC_AIE) {
- AIE_on = 1;
- }
-
- if (timer_init_reqd)
- hpet_rtc_timer_init();
-
- return 1;
-}
-
-int hpet_set_alarm_time(unsigned char hrs, unsigned char min, unsigned char sec)
-{
- if (!is_hpet_enabled())
- return 0;
-
- alarm_time.tm_hour = hrs;
- alarm_time.tm_min = min;
- alarm_time.tm_sec = sec;
-
- return 1;
-}
-
-int hpet_set_periodic_freq(unsigned long freq)
-{
- if (!is_hpet_enabled())
- return 0;
-
- PIE_freq = freq;
- PIE_count = 0;
-
- return 1;
-}
-
-int hpet_rtc_dropped_irq(void)
-{
- if (!is_hpet_enabled())
- return 0;
-
- return 1;
-}
-
-irqreturn_t hpet_rtc_interrupt(int irq, void *dev_id)
-{
- struct rtc_time curr_time;
- unsigned long rtc_int_flag = 0;
- int call_rtc_interrupt = 0;
-
- hpet_rtc_timer_reinit();
-
- if (UIE_on | AIE_on) {
- rtc_get_rtc_time(&curr_time);
- }
- if (UIE_on) {
- if (curr_time.tm_sec != prev_update_sec) {
- /* Set update int info, call real rtc int routine */
- call_rtc_interrupt = 1;
- rtc_int_flag = RTC_UF;
- prev_update_sec = curr_time.tm_sec;
- }
- }
- if (PIE_on) {
- PIE_count++;
- if (PIE_count >= hpet_rtc_int_freq/PIE_freq) {
- /* Set periodic int info, call real rtc int routine */
- call_rtc_interrupt = 1;
- rtc_int_flag |= RTC_PF;
- PIE_count = 0;
- }
- }
- if (AIE_on) {
- if ((curr_time.tm_sec == alarm_time.tm_sec) &&
- (curr_time.tm_min == alarm_time.tm_min) &&
- (curr_time.tm_hour == alarm_time.tm_hour)) {
- /* Set alarm int info, call real rtc int routine */
- call_rtc_interrupt = 1;
- rtc_int_flag |= RTC_AF;
- }
- }
- if (call_rtc_interrupt) {
- rtc_int_flag |= (RTC_IRQF | (RTC_NUM_INTS << 8));
- rtc_interrupt(rtc_int_flag, dev_id);
- }
- return IRQ_HANDLED;
-}
-#endif
-
diff -puN include/asm-i386/hpet.h~clockevents-convert-hpet-to-clockevents include/asm-i386/hpet.h
--- a/include/asm-i386/hpet.h~clockevents-convert-hpet-to-clockevents
+++ a/include/asm-i386/hpet.h
@@ -90,15 +90,19 @@
#define HPET_MIN_PERIOD (100000UL)
#define HPET_TICK_RATE (HZ * 100000UL)
-extern unsigned long hpet_tick; /* hpet clks count per tick */
extern unsigned long hpet_address; /* hpet memory map physical address */
-extern int hpet_use_timer;
+extern int is_hpet_enabled(void);
+#ifdef CONFIG_X86_64
+extern unsigned long hpet_tick; /* hpet clks count per tick */
+extern int hpet_use_timer;
extern int hpet_rtc_timer_init(void);
extern int hpet_enable(void);
-extern int is_hpet_enabled(void);
extern int is_hpet_capable(void);
extern int hpet_readl(unsigned long a);
+#else
+extern int hpet_enable(void);
+#endif
#ifdef CONFIG_HPET_EMULATE_RTC
extern int hpet_mask_rtc_irq_bit(unsigned long bit_mask);
@@ -109,5 +113,10 @@ extern int hpet_rtc_dropped_irq(void);
extern int hpet_rtc_timer_init(void);
extern irqreturn_t hpet_rtc_interrupt(int irq, void *dev_id);
#endif /* CONFIG_HPET_EMULATE_RTC */
+
+#else
+
+static inline int hpet_enable(void) { return 0; }
+
#endif /* CONFIG_HPET_TIMER */
#endif /* _I386_HPET_H */
_
Patches currently in -mm which might be from tglx@xxxxxxxxxxxxx are
origin.patch
git-mtd.patch
gtod-persistent-clock-support-core.patch
gtod-persistent-clock-support-i386.patch
gtod-persistent-clock-support-i386-i386-unexport-read_persistent_clock.patch
time-uninline-jiffiesh.patch
time-uninline-jiffiesh-fix.patch
time-fix-msecs_to_jiffies-bug.patch
time-fix-timeout-overflow.patch
cleanup-uninline-irq_enter-and-move-it-into-a-function.patch
dynticks-extend-next_timer_interrupt-to-use-a-reference-jiffie.patch
dynticks-extend-next_timer_interrupt-to-use-a-reference-jiffie-remove-incorrect-warning-in-kernel-timerc.patch
hrtimers-namespace-and-enum-cleanup.patch
hrtimers-clean-up-locking.patch
hrtimers-clean-up-locking-fix.patch
updated-hrtimers-state-tracking.patch
updated-hrtimers-clean-up-callback-tracking.patch
updated-hrtimers-move-and-add-documentation.patch
updated-add-a-framework-to-manage-clock-event-devices.patch
updated-add-a-framework-to-manage-clock-event-devices-next_event-calculation-fix.patch
updated-add-a-framework-to-manage-clock-event-devices-pit-broadcasting-fix.patch
updated-acpi-include-apich.patch
updated-acpi-keep-track-of-timer-broadcast.patch
updated-acpi-add-state-propagation-for-dynamic-broadcasting.patch
updated-i386-cleanup-apic-code.patch
updated-i386-convert-to-clock-event-devices.patch
updated-i386-convert-to-clock-event-devices-fix.patch
updated-i386-convert-to-clock-event-devices-arch-i386-kernel-apicc-make-a-function-static.patch
updated-i386-convert-to-clock-event-devices-remove-arch-i386-kernel-time_hpetchpet_reenable.patch
updated-pm_timer-allow-early-access-and-move-externs-to-a-header-file.patch
updated-i386-rework-local-apic-calibration.patch
updated-high-res-timers-core.patch
updated-high-res-timers-core-high-res-timers-do-itimer-rearming-in-process-context.patch
updated-gtod-mark-tsc-unusable-for-highres-timers.patch
high-res-timers-utilize-tsc-clocksource-again.patch
high-res-timers-utilize-tsc-clocksource-again-fix.patch
updated-dynticks-core-code.patch
updated-dyntick-add-nohz-stats-to-proc-stat.patch
updated-dynticks-i386-arch-code.patch
updated-dynticks-fix-nmi-watchdog.patch
updated-high-res-timers-dynticks-enable-i386-support.patch
updated-debugging-feature-timer-stats.patch
clockevents-core-check-for-clock-event-device-handler-being-non-null-before-calling-it.patch
clockevents-convert-hpet-to-clockevents.patch
hrtimers-cleanup-state-tracking-update.patch
clockevents-make-apicc-exports-gpl-remove-fastcall-attributes.patch
clockevents-i8253c-remove-hpet-dependencies.patch
clockevents-remove-ptregs-argument-from-handlers.patch
-
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