hpet.h

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#ifndef __HPET__
#define __HPET__ 1

#include <uapi/linux/hpet.h>


/*
 * 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              /* !__HPET__ */