include/linux/hpet.h

   1 #ifndef __HPET__
   2 #define __HPET__ 1
   3
   4 /*
   5  * Offsets into HPET Registers
   6  */
   7
   8 struct hpet {
   9         u64 hpet_cap;           /* capabilities */
  10         u64 res0;               /* reserved */
  11         u64 hpet_config;        /* configuration */
  12         u64 res1;               /* reserved */
  13         u64 hpet_isr;           /* interrupt status reg */
  14         u64 res2[25];           /* reserved */
  15         union {                 /* main counter */
  16                 u64 _hpet_mc64;
  17                 u32 _hpet_mc32;
  18                 unsigned long _hpet_mc;
  19         } _u0;
  20         u64 res3;               /* reserved */
  21         struct hpet_timer {
  22                 u64 hpet_config;        /* configuration/cap */
  23                 union {         /* timer compare register */
  24                         u64 _hpet_hc64;
  25                         u32 _hpet_hc32;
  26                         unsigned long _hpet_compare;
  27                 } _u1;
  28                 u64 hpet_fsb[2];        /* FSB route */
  29         } hpet_timers[1];
  30 };
  31
  32 #define hpet_mc         _u0._hpet_mc
  33 #define hpet_compare    _u1._hpet_compare
  34
  35 #define HPET_MAX_TIMERS (32)
  36
  37 /*
  38  * HPET general capabilities register
  39  */
  40
  41 #define HPET_COUNTER_CLK_PERIOD_MASK    (0xffffffff00000000ULL)
  42 #define HPET_COUNTER_CLK_PERIOD_SHIFT   (32UL)
  43 #define HPET_VENDOR_ID_MASK             (0x00000000ffff0000ULL)
  44 #define HPET_VENDOR_ID_SHIFT            (16ULL)
  45 #define HPET_LEG_RT_CAP_MASK            (0x8000)
  46 #define HPET_COUNTER_SIZE_MASK          (0x2000)
  47 #define HPET_NUM_TIM_CAP_MASK           (0x1f00)
  48 #define HPET_NUM_TIM_CAP_SHIFT          (8ULL)
  49
  50 /*
  51  * HPET general configuration register
  52  */
  53
  54 #define HPET_LEG_RT_CNF_MASK            (2UL)
  55 #define HPET_ENABLE_CNF_MASK            (1UL)
  56
  57
  58 /*
  59  * Timer configuration register
  60  */
  61
  62 #define Tn_INT_ROUTE_CAP_MASK           (0xffffffff00000000ULL)
  63 #define Tn_INI_ROUTE_CAP_SHIFT          (32UL)
  64 #define Tn_FSB_INT_DELCAP_MASK          (0x8000UL)
  65 #define Tn_FSB_INT_DELCAP_SHIFT         (15)
  66 #define Tn_FSB_EN_CNF_MASK              (0x4000UL)
  67 #define Tn_FSB_EN_CNF_SHIFT             (14)
  68 #define Tn_INT_ROUTE_CNF_MASK           (0x3e00UL)
  69 #define Tn_INT_ROUTE_CNF_SHIFT          (9)
  70 #define Tn_32MODE_CNF_MASK              (0x0100UL)
  71 #define Tn_VAL_SET_CNF_MASK             (0x0040UL)
  72 #define Tn_SIZE_CAP_MASK                (0x0020UL)
  73 #define Tn_PER_INT_CAP_MASK             (0x0010UL)
  74 #define Tn_TYPE_CNF_MASK                (0x0008UL)
  75 #define Tn_INT_ENB_CNF_MASK             (0x0004UL)
  76 #define Tn_INT_TYPE_CNF_MASK            (0x0002UL)
  77
  78 /*
  79  * Timer FSB Interrupt Route Register
  80  */
  81
  82 #define Tn_FSB_INT_ADDR_MASK            (0xffffffff00000000ULL)
  83 #define Tn_FSB_INT_ADDR_SHIFT           (32UL)
  84 #define Tn_FSB_INT_VAL_MASK             (0x00000000ffffffffULL)
  85
  86 struct hpet_info {
  87         unsigned long hi_ireqfreq;      /* Hz */
  88         unsigned long hi_flags; /* information */
  89         unsigned short hi_hpet;
  90         unsigned short hi_timer;
  91 };
  92
  93 #define HPET_INFO_PERIODIC      0x0001  /* timer is periodic */
  94
  95 #define HPET_IE_ON      _IO('h', 0x01)  /* interrupt on */
  96 #define HPET_IE_OFF     _IO('h', 0x02)  /* interrupt off */
  97 #define HPET_INFO       _IOR('h', 0x03, struct hpet_info)
  98 #define HPET_EPI        _IO('h', 0x04)  /* enable periodic */
  99 #define HPET_DPI        _IO('h', 0x05)  /* disable periodic */
 100 #define HPET_IRQFREQ    _IOW('h', 0x6, unsigned long)   /* IRQFREQ usec */
 101
 102 /*
 103  * exported interfaces
 104  */
 105
 106 struct hpet_task {
 107         void (*ht_func) (void *);
 108         void *ht_data;
 109         void *ht_opaque;
 110 };
 111
 112 struct hpet_data {
 113         unsigned long hd_address;
 114         unsigned short hd_nirqs;
 115         unsigned short hd_flags;
 116         unsigned int hd_state;  /* timer allocated */
 117         unsigned int hd_irq[HPET_MAX_TIMERS];
 118 };
 119
 120 #define HPET_DATA_PLATFORM      0x0001  /* platform call to hpet_alloc */
 121
 122 static inline void hpet_reserve_timer(struct hpet_data *hd, int timer)
 123 {
 124         hd->hd_state |= (1 << timer);
 125         return;
 126 }
 127
 128 int hpet_alloc(struct hpet_data *);
 129 int hpet_register(struct hpet_task *, int);
 130 int hpet_unregister(struct hpet_task *);
 131 int hpet_control(struct hpet_task *, unsigned int, unsigned long);
 132
 133 #endif                          /* !__HPET__ */