include/linux/hpet.h

   1 #ifndef __HPET__
   2 #define __HPET__ 1
   3
   4 #include <linux/compiler.h>
   5
   6 #ifdef __KERNEL__
   7
   8 /*
   9  * Offsets into HPET Registers
  10  */
  11
  12 struct hpet {
  13         u64 hpet_cap;           /* capabilities */
  14         u64 res0;               /* reserved */
  15         u64 hpet_config;        /* configuration */
  16         u64 res1;               /* reserved */
  17         u64 hpet_isr;           /* interrupt status reg */
  18         u64 res2[25];           /* reserved */
  19         union {                 /* main counter */
  20                 u64 _hpet_mc64;
  21                 u32 _hpet_mc32;
  22                 unsigned long _hpet_mc;
  23         } _u0;
  24         u64 res3;               /* reserved */
  25         struct hpet_timer {
  26                 u64 hpet_config;        /* configuration/cap */
  27                 union {         /* timer compare register */
  28                         u64 _hpet_hc64;
  29                         u32 _hpet_hc32;
  30                         unsigned long _hpet_compare;
  31                 } _u1;
  32                 u64 hpet_fsb[2];        /* FSB route */
  33         } hpet_timers[1];
  34 };
  35
  36 #define hpet_mc         _u0._hpet_mc
  37 #define hpet_compare    _u1._hpet_compare
  38
  39 #define HPET_MAX_TIMERS (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_INI_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
  94 struct hpet_task {
  95         void (*ht_func) (void *);
  96         void *ht_data;
  97         void *ht_opaque;
  98 };
  99
 100 struct hpet_data {
 101         unsigned long hd_phys_address;
 102         void __iomem *hd_address;
 103         unsigned short hd_nirqs;
 104         unsigned short hd_flags;
 105         unsigned int hd_state;  /* timer allocated */
 106         unsigned int hd_irq[HPET_MAX_TIMERS];
 107 };
 108
 109 #define HPET_DATA_PLATFORM      0x0001  /* platform call to hpet_alloc */
 110
 111 static inline void hpet_reserve_timer(struct hpet_data *hd, int timer)
 112 {
 113         hd->hd_state |= (1 << timer);
 114         return;
 115 }
 116
 117 int hpet_alloc(struct hpet_data *);
 118
 119 #endif /* __KERNEL__ */
 120
 121 struct hpet_info {
 122         unsigned long hi_ireqfreq;      /* Hz */
 123         unsigned long hi_flags; /* information */
 124         unsigned short hi_hpet;
 125         unsigned short hi_timer;
 126 };
 127
 128 #define HPET_INFO_PERIODIC      0x0001  /* timer is periodic */
 129
 130 #define HPET_IE_ON      _IO('h', 0x01)  /* interrupt on */
 131 #define HPET_IE_OFF     _IO('h', 0x02)  /* interrupt off */
 132 #define HPET_INFO       _IOR('h', 0x03, struct hpet_info)
 133 #define HPET_EPI        _IO('h', 0x04)  /* enable periodic */
 134 #define HPET_DPI        _IO('h', 0x05)  /* disable periodic */
 135 #define HPET_IRQFREQ    _IOW('h', 0x6, unsigned long)   /* IRQFREQ usec */
 136
 137 #endif                          /* !__HPET__ */