root/include/linux/hpet.h

INCLUDED FROM

DEFINITIONS

1. hpet_reserve_timer

#ifndef __HPET__
#define __HPET__ 1

#include <linux/compiler.h>

#ifdef __KERNEL__

/*
 * Offsets into HPET Registers
 */

struct hpet {
        u64 hpet_cap;           /* capabilities */
        u64 res0;               /* reserved */
        u64 hpet_config;        /* configuration */
        u64 res1;               /* reserved */
        u64 hpet_isr;           /* interrupt status reg */
        u64 res2[25];           /* reserved */
        union {                 /* main counter */
                u64 _hpet_mc64;
                u32 _hpet_mc32;
                unsigned long _hpet_mc;
        } _u0;
        u64 res3;               /* reserved */
        struct hpet_timer {
                u64 hpet_config;        /* configuration/cap */
                union {         /* timer compare register */
                        u64 _hpet_hc64;
                        u32 _hpet_hc32;
                        unsigned long _hpet_compare;
                } _u1;
                u64 hpet_fsb[2];        /* FSB route */
        } hpet_timers[1];
};

#define hpet_mc         _u0._hpet_mc
#define hpet_compare    _u1._hpet_compare

#define HPET_MAX_TIMERS (32)
#define HPET_MAX_IRQ    (32)

/*
 * HPET general capabilities register
 */

#define HPET_COUNTER_CLK_PERIOD_MASK    (0xffffffff00000000ULL)
#define HPET_COUNTER_CLK_PERIOD_SHIFT   (32UL)
#define HPET_VENDOR_ID_MASK             (0x00000000ffff0000ULL)
#define HPET_VENDOR_ID_SHIFT            (16ULL)
#define HPET_LEG_RT_CAP_MASK            (0x8000)
#define HPET_COUNTER_SIZE_MASK          (0x2000)
#define HPET_NUM_TIM_CAP_MASK           (0x1f00)
#define HPET_NUM_TIM_CAP_SHIFT          (8ULL)

/*
 * HPET general configuration register
 */

#define HPET_LEG_RT_CNF_MASK            (2UL)
#define HPET_ENABLE_CNF_MASK            (1UL)


/*
 * Timer configuration register
 */

#define Tn_INT_ROUTE_CAP_MASK           (0xffffffff00000000ULL)
#define Tn_INT_ROUTE_CAP_SHIFT          (32UL)
#define Tn_FSB_INT_DELCAP_MASK          (0x8000UL)
#define Tn_FSB_INT_DELCAP_SHIFT         (15)
#define Tn_FSB_EN_CNF_MASK              (0x4000UL)
#define Tn_FSB_EN_CNF_SHIFT             (14)
#define Tn_INT_ROUTE_CNF_MASK           (0x3e00UL)
#define Tn_INT_ROUTE_CNF_SHIFT          (9)
#define Tn_32MODE_CNF_MASK              (0x0100UL)
#define Tn_VAL_SET_CNF_MASK             (0x0040UL)
#define Tn_SIZE_CAP_MASK                (0x0020UL)
#define Tn_PER_INT_CAP_MASK             (0x0010UL)
#define Tn_TYPE_CNF_MASK                (0x0008UL)
#define Tn_INT_ENB_CNF_MASK             (0x0004UL)
#define Tn_INT_TYPE_CNF_MASK            (0x0002UL)

/*
 * Timer FSB Interrupt Route Register
 */

#define Tn_FSB_INT_ADDR_MASK            (0xffffffff00000000ULL)
#define Tn_FSB_INT_ADDR_SHIFT           (32UL)
#define Tn_FSB_INT_VAL_MASK             (0x00000000ffffffffULL)

/*
 * exported interfaces
 */

struct hpet_data {
        unsigned long hd_phys_address;
        void __iomem *hd_address;
        unsigned short hd_nirqs;
        unsigned int hd_state;  /* timer allocated */
        unsigned int hd_irq[HPET_MAX_TIMERS];
};

static inline void hpet_reserve_timer(struct hpet_data *hd, int timer)
{
        hd->hd_state |= (1 << timer);
        return;
}

int hpet_alloc(struct hpet_data *);

#endif /* __KERNEL__ */

struct hpet_info {
        unsigned long hi_ireqfreq;      /* Hz */
        unsigned long hi_flags; /* information */
        unsigned short hi_hpet;
        unsigned short hi_timer;
};

#define HPET_INFO_PERIODIC      0x0010  /* periodic-capable comparator */

#define HPET_IE_ON      _IO('h', 0x01)  /* interrupt on */
#define HPET_IE_OFF     _IO('h', 0x02)  /* interrupt off */
#define HPET_INFO       _IOR('h', 0x03, struct hpet_info)
#define HPET_EPI        _IO('h', 0x04)  /* enable periodic */
#define HPET_DPI        _IO('h', 0x05)  /* disable periodic */
#define HPET_IRQFREQ    _IOW('h', 0x6, unsigned long)   /* IRQFREQ usec */

#endif                          /* !__HPET__ */