include/linux/hpet.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 #ifndef __HPET__
   3 #define __HPET__ 1
   4
   5 #include <uapi/linux/hpet.h>
   6
   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 #define HPET_MAX_IRQ    (32)
  41
  42 /*
  43  * HPET general capabilities register
  44  */
  45
  46 #define HPET_COUNTER_CLK_PERIOD_MASK    (0xffffffff00000000ULL)
  47 #define HPET_COUNTER_CLK_PERIOD_SHIFT   (32UL)
  48 #define HPET_VENDOR_ID_MASK             (0x00000000ffff0000ULL)
  49 #define HPET_VENDOR_ID_SHIFT            (16ULL)
  50 #define HPET_LEG_RT_CAP_MASK            (0x8000)
  51 #define HPET_COUNTER_SIZE_MASK          (0x2000)
  52 #define HPET_NUM_TIM_CAP_MASK           (0x1f00)
  53 #define HPET_NUM_TIM_CAP_SHIFT          (8ULL)
  54
  55 /*
  56  * HPET general configuration register
  57  */
  58
  59 #define HPET_LEG_RT_CNF_MASK            (2UL)
  60 #define HPET_ENABLE_CNF_MASK            (1UL)
  61
  62
  63 /*
  64  * Timer configuration register
  65  */
  66
  67 #define Tn_INT_ROUTE_CAP_MASK           (0xffffffff00000000ULL)
  68 #define Tn_INT_ROUTE_CAP_SHIFT          (32UL)
  69 #define Tn_FSB_INT_DELCAP_MASK          (0x8000UL)
  70 #define Tn_FSB_INT_DELCAP_SHIFT         (15)
  71 #define Tn_FSB_EN_CNF_MASK              (0x4000UL)
  72 #define Tn_FSB_EN_CNF_SHIFT             (14)
  73 #define Tn_INT_ROUTE_CNF_MASK           (0x3e00UL)
  74 #define Tn_INT_ROUTE_CNF_SHIFT          (9)
  75 #define Tn_32MODE_CNF_MASK              (0x0100UL)
  76 #define Tn_VAL_SET_CNF_MASK             (0x0040UL)
  77 #define Tn_SIZE_CAP_MASK                (0x0020UL)
  78 #define Tn_PER_INT_CAP_MASK             (0x0010UL)
  79 #define Tn_TYPE_CNF_MASK                (0x0008UL)
  80 #define Tn_INT_ENB_CNF_MASK             (0x0004UL)
  81 #define Tn_INT_TYPE_CNF_MASK            (0x0002UL)
  82
  83 /*
  84  * Timer FSB Interrupt Route Register
  85  */
  86
  87 #define Tn_FSB_INT_ADDR_MASK            (0xffffffff00000000ULL)
  88 #define Tn_FSB_INT_ADDR_SHIFT           (32UL)
  89 #define Tn_FSB_INT_VAL_MASK             (0x00000000ffffffffULL)
  90
  91 /*
  92  * exported interfaces
  93  */
  94
  95 struct hpet_data {
  96         unsigned long hd_phys_address;
  97         void __iomem *hd_address;
  98         unsigned short hd_nirqs;
  99         unsigned int hd_state;  /* timer allocated */
 100         unsigned int hd_irq[HPET_MAX_TIMERS];
 101 };
 102
 103 static inline void hpet_reserve_timer(struct hpet_data *hd, int timer)
 104 {
 105         hd->hd_state |= (1 << timer);
 106         return;
 107 }
 108
 109 int hpet_alloc(struct hpet_data *);
 110
 111 #endif                          /* !__HPET__ */