forked from Minki/linux
e9e2cdb412
Add clockevent drivers for i386: lapic (local) and PIT/HPET (global). Update the timer IRQ to call into the PIT/HPET driver's event handler and the lapic-timer IRQ to call into the lapic clockevent driver. The assignement of timer functionality is delegated to the core framework code and replaces the compile and runtime evalution in do_timer_interrupt_hook() Use the clockevents broadcast support and implement the lapic_broadcast function for ACPI. No changes to existing functionality. [ kdump fix from Vivek Goyal <vgoyal@in.ibm.com> ] [ fixes based on review feedback from Arjan van de Ven <arjan@infradead.org> ] Cleanups-from: Adrian Bunk <bunk@stusta.de> Build-fixes-from: Andrew Morton <akpm@osdl.org> Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: Ingo Molnar <mingo@elte.hu> Cc: john stultz <johnstul@us.ibm.com> Cc: Roman Zippel <zippel@linux-m68k.org> Cc: Andi Kleen <ak@suse.de> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
123 lines
3.3 KiB
C
123 lines
3.3 KiB
C
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#ifndef _I386_HPET_H
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#define _I386_HPET_H
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#ifdef CONFIG_HPET_TIMER
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#include <linux/errno.h>
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#include <linux/module.h>
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#include <linux/sched.h>
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#include <linux/kernel.h>
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#include <linux/param.h>
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#include <linux/string.h>
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#include <linux/mm.h>
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#include <linux/interrupt.h>
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#include <linux/time.h>
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#include <linux/delay.h>
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#include <linux/init.h>
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#include <linux/smp.h>
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#include <asm/io.h>
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#include <asm/smp.h>
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#include <asm/irq.h>
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#include <asm/msr.h>
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#include <asm/delay.h>
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#include <asm/mpspec.h>
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#include <asm/uaccess.h>
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#include <asm/processor.h>
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#include <linux/timex.h>
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#include <asm/fixmap.h>
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/*
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* Documentation on HPET can be found at:
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* http://www.intel.com/ial/home/sp/pcmmspec.htm
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* ftp://download.intel.com/ial/home/sp/mmts098.pdf
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*/
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#define HPET_MMAP_SIZE 1024
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#define HPET_ID 0x000
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#define HPET_PERIOD 0x004
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#define HPET_CFG 0x010
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#define HPET_STATUS 0x020
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#define HPET_COUNTER 0x0f0
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#define HPET_T0_CFG 0x100
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#define HPET_T0_CMP 0x108
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#define HPET_T0_ROUTE 0x110
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#define HPET_T1_CFG 0x120
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#define HPET_T1_CMP 0x128
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#define HPET_T1_ROUTE 0x130
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#define HPET_T2_CFG 0x140
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#define HPET_T2_CMP 0x148
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#define HPET_T2_ROUTE 0x150
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#define HPET_ID_LEGSUP 0x00008000
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#define HPET_ID_NUMBER 0x00001f00
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#define HPET_ID_REV 0x000000ff
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#define HPET_ID_NUMBER_SHIFT 8
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#define HPET_CFG_ENABLE 0x001
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#define HPET_CFG_LEGACY 0x002
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#define HPET_LEGACY_8254 2
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#define HPET_LEGACY_RTC 8
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#define HPET_TN_ENABLE 0x004
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#define HPET_TN_PERIODIC 0x008
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#define HPET_TN_PERIODIC_CAP 0x010
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#define HPET_TN_SETVAL 0x040
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#define HPET_TN_32BIT 0x100
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/* Use our own asm for 64 bit multiply/divide */
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#define ASM_MUL64_REG(eax_out,edx_out,reg_in,eax_in) \
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__asm__ __volatile__("mull %2" \
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:"=a" (eax_out), "=d" (edx_out) \
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:"r" (reg_in), "0" (eax_in))
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#define ASM_DIV64_REG(eax_out,edx_out,reg_in,eax_in,edx_in) \
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__asm__ __volatile__("divl %2" \
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:"=a" (eax_out), "=d" (edx_out) \
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:"r" (reg_in), "0" (eax_in), "1" (edx_in))
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#define KERNEL_TICK_USEC (1000000UL/HZ) /* tick value in microsec */
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/* Max HPET Period is 10^8 femto sec as in HPET spec */
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#define HPET_MAX_PERIOD (100000000UL)
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/*
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* Min HPET period is 10^5 femto sec just for safety. If it is less than this,
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* then 32 bit HPET counter wrapsaround in less than 0.5 sec.
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*/
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#define HPET_MIN_PERIOD (100000UL)
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#define HPET_TICK_RATE (HZ * 100000UL)
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extern unsigned long hpet_address; /* hpet memory map physical address */
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extern int is_hpet_enabled(void);
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#ifdef CONFIG_X86_64
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extern unsigned long hpet_tick; /* hpet clks count per tick */
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extern int hpet_use_timer;
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extern int hpet_rtc_timer_init(void);
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extern int hpet_enable(void);
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extern int is_hpet_capable(void);
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extern int hpet_readl(unsigned long a);
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#else
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extern int hpet_enable(void);
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#endif
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#ifdef CONFIG_HPET_EMULATE_RTC
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extern int hpet_mask_rtc_irq_bit(unsigned long bit_mask);
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extern int hpet_set_rtc_irq_bit(unsigned long bit_mask);
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extern int hpet_set_alarm_time(unsigned char hrs, unsigned char min, unsigned char sec);
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extern int hpet_set_periodic_freq(unsigned long freq);
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extern int hpet_rtc_dropped_irq(void);
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extern int hpet_rtc_timer_init(void);
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extern irqreturn_t hpet_rtc_interrupt(int irq, void *dev_id);
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#endif /* CONFIG_HPET_EMULATE_RTC */
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#else
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static inline int hpet_enable(void) { return 0; }
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#endif /* CONFIG_HPET_TIMER */
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#endif /* _I386_HPET_H */
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