linux/include/linux/hpet.h
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   1#ifndef __HPET__
   2#define __HPET__ 1
   3
   4#include <uapi/linux/hpet.h>
   5
   6
   7/*
   8 * Offsets into HPET Registers
   9 */
  10
  11struct hpet {
  12        u64 hpet_cap;           /* capabilities */
  13        u64 res0;               /* reserved */
  14        u64 hpet_config;        /* configuration */
  15        u64 res1;               /* reserved */
  16        u64 hpet_isr;           /* interrupt status reg */
  17        u64 res2[25];           /* reserved */
  18        union {                 /* main counter */
  19                u64 _hpet_mc64;
  20                u32 _hpet_mc32;
  21                unsigned long _hpet_mc;
  22        } _u0;
  23        u64 res3;               /* reserved */
  24        struct hpet_timer {
  25                u64 hpet_config;        /* configuration/cap */
  26                union {         /* timer compare register */
  27                        u64 _hpet_hc64;
  28                        u32 _hpet_hc32;
  29                        unsigned long _hpet_compare;
  30                } _u1;
  31                u64 hpet_fsb[2];        /* FSB route */
  32        } hpet_timers[1];
  33};
  34
  35#define hpet_mc         _u0._hpet_mc
  36#define hpet_compare    _u1._hpet_compare
  37
  38#define HPET_MAX_TIMERS (32)
  39#define HPET_MAX_IRQ    (32)
  40
  41/*
  42 * HPET general capabilities register
  43 */
  44
  45#define HPET_COUNTER_CLK_PERIOD_MASK    (0xffffffff00000000ULL)
  46#define HPET_COUNTER_CLK_PERIOD_SHIFT   (32UL)
  47#define HPET_VENDOR_ID_MASK             (0x00000000ffff0000ULL)
  48#define HPET_VENDOR_ID_SHIFT            (16ULL)
  49#define HPET_LEG_RT_CAP_MASK            (0x8000)
  50#define HPET_COUNTER_SIZE_MASK          (0x2000)
  51#define HPET_NUM_TIM_CAP_MASK           (0x1f00)
  52#define HPET_NUM_TIM_CAP_SHIFT          (8ULL)
  53
  54/*
  55 * HPET general configuration register
  56 */
  57
  58#define HPET_LEG_RT_CNF_MASK            (2UL)
  59#define HPET_ENABLE_CNF_MASK            (1UL)
  60
  61
  62/*
  63 * Timer configuration register
  64 */
  65
  66#define Tn_INT_ROUTE_CAP_MASK           (0xffffffff00000000ULL)
  67#define Tn_INT_ROUTE_CAP_SHIFT          (32UL)
  68#define Tn_FSB_INT_DELCAP_MASK          (0x8000UL)
  69#define Tn_FSB_INT_DELCAP_SHIFT         (15)
  70#define Tn_FSB_EN_CNF_MASK              (0x4000UL)
  71#define Tn_FSB_EN_CNF_SHIFT             (14)
  72#define Tn_INT_ROUTE_CNF_MASK           (0x3e00UL)
  73#define Tn_INT_ROUTE_CNF_SHIFT          (9)
  74#define Tn_32MODE_CNF_MASK              (0x0100UL)
  75#define Tn_VAL_SET_CNF_MASK             (0x0040UL)
  76#define Tn_SIZE_CAP_MASK                (0x0020UL)
  77#define Tn_PER_INT_CAP_MASK             (0x0010UL)
  78#define Tn_TYPE_CNF_MASK                (0x0008UL)
  79#define Tn_INT_ENB_CNF_MASK             (0x0004UL)
  80#define Tn_INT_TYPE_CNF_MASK            (0x0002UL)
  81
  82/*
  83 * Timer FSB Interrupt Route Register
  84 */
  85
  86#define Tn_FSB_INT_ADDR_MASK            (0xffffffff00000000ULL)
  87#define Tn_FSB_INT_ADDR_SHIFT           (32UL)
  88#define Tn_FSB_INT_VAL_MASK             (0x00000000ffffffffULL)
  89
  90/*
  91 * exported interfaces
  92 */
  93
  94struct hpet_data {
  95        unsigned long hd_phys_address;
  96        void __iomem *hd_address;
  97        unsigned short hd_nirqs;
  98        unsigned int hd_state;  /* timer allocated */
  99        unsigned int hd_irq[HPET_MAX_TIMERS];
 100};
 101
 102static inline void hpet_reserve_timer(struct hpet_data *hd, int timer)
 103{
 104        hd->hd_state |= (1 << timer);
 105        return;
 106}
 107
 108int hpet_alloc(struct hpet_data *);
 109
 110#endif                          /* !__HPET__ */
 111
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