include/asm-i386/hpet.h

   1
   2 #ifndef _I386_HPET_H
   3 #define _I386_HPET_H
   4
   5 #ifdef CONFIG_HPET_TIMER
   6
   7 #include <linux/errno.h>
   8 #include <linux/module.h>
   9 #include <linux/sched.h>
  10 #include <linux/kernel.h>
  11 #include <linux/param.h>
  12 #include <linux/string.h>
  13 #include <linux/mm.h>
  14 #include <linux/interrupt.h>
  15 #include <linux/time.h>
  16 #include <linux/delay.h>
  17 #include <linux/init.h>
  18 #include <linux/smp.h>
  19
  20 #include <asm/io.h>
  21 #include <asm/smp.h>
  22 #include <asm/irq.h>
  23 #include <asm/msr.h>
  24 #include <asm/delay.h>
  25 #include <asm/mpspec.h>
  26 #include <asm/uaccess.h>
  27 #include <asm/processor.h>
  28
  29 #include <linux/timex.h>
  30
  31 #include <asm/fixmap.h>
  32
  33 /*
  34  * Documentation on HPET can be found at:
  35  *      http://www.intel.com/ial/home/sp/pcmmspec.htm
  36  *      ftp://download.intel.com/ial/home/sp/mmts098.pdf
  37  */
  38
  39 #define HPET_MMAP_SIZE  1024
  40
  41 #define HPET_ID         0x000
  42 #define HPET_PERIOD     0x004
  43 #define HPET_CFG        0x010
  44 #define HPET_STATUS     0x020
  45 #define HPET_COUNTER    0x0f0
  46 #define HPET_T0_CFG     0x100
  47 #define HPET_T0_CMP     0x108
  48 #define HPET_T0_ROUTE   0x110
  49 #define HPET_T1_CFG     0x120
  50 #define HPET_T1_CMP     0x128
  51 #define HPET_T1_ROUTE   0x130
  52 #define HPET_T2_CFG     0x140
  53 #define HPET_T2_CMP     0x148
  54 #define HPET_T2_ROUTE   0x150
  55
  56 #define HPET_ID_LEGSUP  0x00008000
  57 #define HPET_ID_NUMBER  0x00001f00
  58 #define HPET_ID_REV     0x000000ff
  59 #define HPET_ID_NUMBER_SHIFT    8
  60
  61 #define HPET_CFG_ENABLE 0x001
  62 #define HPET_CFG_LEGACY 0x002
  63 #define HPET_LEGACY_8254        2
  64 #define HPET_LEGACY_RTC         8
  65
  66 #define HPET_TN_ENABLE          0x004
  67 #define HPET_TN_PERIODIC        0x008
  68 #define HPET_TN_PERIODIC_CAP    0x010
  69 #define HPET_TN_SETVAL          0x040
  70 #define HPET_TN_32BIT           0x100
  71
  72 /* Use our own asm for 64 bit multiply/divide */
  73 #define ASM_MUL64_REG(eax_out,edx_out,reg_in,eax_in)                    \
  74                 __asm__ __volatile__("mull %2"                          \
  75                                 :"=a" (eax_out), "=d" (edx_out)         \
  76                                 :"r" (reg_in), "0" (eax_in))
  77
  78 #define ASM_DIV64_REG(eax_out,edx_out,reg_in,eax_in,edx_in)             \
  79                 __asm__ __volatile__("divl %2"                          \
  80                                 :"=a" (eax_out), "=d" (edx_out)         \
  81                                 :"r" (reg_in), "0" (eax_in), "1" (edx_in))
  82
  83 #define KERNEL_TICK_USEC        (1000000UL/HZ)  /* tick value in microsec */
  84 /* Max HPET Period is 10^8 femto sec as in HPET spec */
  85 #define HPET_MAX_PERIOD (100000000UL)
  86 /*
  87  * Min HPET period is 10^5 femto sec just for safety. If it is less than this,
  88  * then 32 bit HPET counter wrapsaround in less than 0.5 sec.
  89  */
  90 #define HPET_MIN_PERIOD (100000UL)
  91 #define HPET_TICK_RATE  (HZ * 100000UL)
  92
  93 extern unsigned long hpet_address;      /* hpet memory map physical address */
  94 extern int is_hpet_enabled(void);
  95
  96 #ifdef CONFIG_X86_64
  97 extern unsigned long hpet_tick; /* hpet clks count per tick */
  98 extern int hpet_use_timer;
  99 extern int hpet_rtc_timer_init(void);
 100 extern int hpet_enable(void);
 101 extern int is_hpet_capable(void);
 102 extern int hpet_readl(unsigned long a);
 103 #else
 104 extern int hpet_enable(void);
 105 #endif
 106
 107 #ifdef CONFIG_HPET_EMULATE_RTC
 108 extern int hpet_mask_rtc_irq_bit(unsigned long bit_mask);
 109 extern int hpet_set_rtc_irq_bit(unsigned long bit_mask);
 110 extern int hpet_set_alarm_time(unsigned char hrs, unsigned char min, unsigned char sec);
 111 extern int hpet_set_periodic_freq(unsigned long freq);
 112 extern int hpet_rtc_dropped_irq(void);
 113 extern int hpet_rtc_timer_init(void);
 114 extern irqreturn_t hpet_rtc_interrupt(int irq, void *dev_id);
 115 #endif /* CONFIG_HPET_EMULATE_RTC */
 116
 117 #else
 118
 119 static inline int hpet_enable(void) { return 0; }
 120
 121 #endif /* CONFIG_HPET_TIMER */
 122 #endif /* _I386_HPET_H */