5 #ifdef CONFIG_HPET_TIMER
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>
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>
24 #include <asm/delay.h>
25 #include <asm/mpspec.h>
26 #include <asm/uaccess.h>
27 #include <asm/processor.h>
29 #include <linux/timex.h>
30 #include <linux/config.h>
32 #include <asm/fixmap.h>
35 * Documentation on HPET can be found at:
36 * http://www.intel.com/ial/home/sp/pcmmspec.htm
37 * ftp://download.intel.com/ial/home/sp/mmts098.pdf
40 #define HPET_MMAP_SIZE 1024
43 #define HPET_PERIOD 0x004
44 #define HPET_CFG 0x010
45 #define HPET_STATUS 0x020
46 #define HPET_COUNTER 0x0f0
47 #define HPET_T0_CFG 0x100
48 #define HPET_T0_CMP 0x108
49 #define HPET_T0_ROUTE 0x110
50 #define HPET_T1_CFG 0x120
51 #define HPET_T1_CMP 0x128
52 #define HPET_T1_ROUTE 0x130
53 #define HPET_T2_CFG 0x140
54 #define HPET_T2_CMP 0x148
55 #define HPET_T2_ROUTE 0x150
57 #define HPET_ID_LEGSUP 0x00008000
58 #define HPET_ID_NUMBER 0x00001f00
59 #define HPET_ID_REV 0x000000ff
61 #define HPET_CFG_ENABLE 0x001
62 #define HPET_CFG_LEGACY 0x002
64 #define HPET_TN_ENABLE 0x004
65 #define HPET_TN_PERIODIC 0x008
66 #define HPET_TN_PERIODIC_CAP 0x010
67 #define HPET_TN_SETVAL 0x040
68 #define HPET_TN_32BIT 0x100
70 /* Use our own asm for 64 bit multiply/divide */
71 #define ASM_MUL64_REG(eax_out,edx_out,reg_in,eax_in) \
72 __asm__ __volatile__("mull %2" \
73 :"=a" (eax_out), "=d" (edx_out) \
74 :"r" (reg_in), "0" (eax_in))
76 #define ASM_DIV64_REG(eax_out,edx_out,reg_in,eax_in,edx_in) \
77 __asm__ __volatile__("divl %2" \
78 :"=a" (eax_out), "=d" (edx_out) \
79 :"r" (reg_in), "0" (eax_in), "1" (edx_in))
81 #define KERNEL_TICK_USEC (1000000UL/HZ) /* tick value in microsec */
82 /* Max HPET Period is 10^8 femto sec as in HPET spec */
83 #define HPET_MAX_PERIOD (100000000UL)
85 * Min HPET period is 10^5 femto sec just for safety. If it is less than this,
86 * then 32 bit HPET counter wrapsaround in less than 0.5 sec.
88 #define HPET_MIN_PERIOD (100000UL)
90 extern unsigned long hpet_period; /* fsecs / HPET clock */
91 extern unsigned long hpet_tick; /* hpet clks count per tick */
92 extern unsigned long hpet_address; /* hpet memory map physical address */
94 extern int hpet_rtc_timer_init(void);
95 extern int hpet_enable(void);
96 extern int is_hpet_enabled(void);
97 extern int is_hpet_capable(void);
98 extern int hpet_readl(unsigned long a);
99 extern void hpet_writel(unsigned long d, unsigned long a);
101 #ifdef CONFIG_HPET_EMULATE_RTC
102 extern int hpet_mask_rtc_irq_bit(unsigned long bit_mask);
103 extern int hpet_set_rtc_irq_bit(unsigned long bit_mask);
104 extern int hpet_set_alarm_time(unsigned char hrs, unsigned char min, unsigned char sec);
105 extern int hpet_set_periodic_freq(unsigned long freq);
106 extern int hpet_rtc_dropped_irq(void);
107 extern int hpet_rtc_timer_init(void);
108 extern irqreturn_t hpet_rtc_interrupt(int irq, void *dev_id, struct pt_regs *regs);
109 #endif /* CONFIG_HPET_EMULATE_RTC */
110 #endif /* CONFIG_HPET_TIMER */
111 #endif /* _I386_HPET_H */