hpet.h

  1/* SPDX-License-Identifier: GPL-2.0 */
  2#ifndef _ASM_X86_HPET_H
  3#define _ASM_X86_HPET_H
  4
  5#include <linux/msi.h>
  6
  7#ifdef CONFIG_HPET_TIMER
  8
  9#define HPET_MMAP_SIZE		1024
 10
 11#define HPET_ID			0x000
 12#define HPET_PERIOD		0x004
 13#define HPET_CFG		0x010
 14#define HPET_STATUS		0x020
 15#define HPET_COUNTER		0x0f0
 16
 17#define HPET_Tn_CFG(n)		(0x100 + 0x20 * n)
 18#define HPET_Tn_CMP(n)		(0x108 + 0x20 * n)
 19#define HPET_Tn_ROUTE(n)	(0x110 + 0x20 * n)
 20
 21#define HPET_T0_CFG		0x100
 22#define HPET_T0_CMP		0x108
 23#define HPET_T0_ROUTE		0x110
 24#define HPET_T1_CFG		0x120
 25#define HPET_T1_CMP		0x128
 26#define HPET_T1_ROUTE		0x130
 27#define HPET_T2_CFG		0x140
 28#define HPET_T2_CMP		0x148
 29#define HPET_T2_ROUTE		0x150
 30
 31#define HPET_ID_REV		0x000000ff
 32#define HPET_ID_NUMBER		0x00001f00
 33#define HPET_ID_64BIT		0x00002000
 34#define HPET_ID_LEGSUP		0x00008000
 35#define HPET_ID_VENDOR		0xffff0000
 36#define	HPET_ID_NUMBER_SHIFT	8
 37#define HPET_ID_VENDOR_SHIFT	16
 38
 39#define HPET_CFG_ENABLE		0x001
 40#define HPET_CFG_LEGACY		0x002
 41#define	HPET_LEGACY_8254	2
 42#define	HPET_LEGACY_RTC		8
 43
 44#define HPET_TN_LEVEL		0x0002
 45#define HPET_TN_ENABLE		0x0004
 46#define HPET_TN_PERIODIC	0x0008
 47#define HPET_TN_PERIODIC_CAP	0x0010
 48#define HPET_TN_64BIT_CAP	0x0020
 49#define HPET_TN_SETVAL		0x0040
 50#define HPET_TN_32BIT		0x0100
 51#define HPET_TN_ROUTE		0x3e00
 52#define HPET_TN_FSB		0x4000
 53#define HPET_TN_FSB_CAP		0x8000
 54#define HPET_TN_ROUTE_SHIFT	9
 55
 56/* Max HPET Period is 10^8 femto sec as in HPET spec */
 57#define HPET_MAX_PERIOD		100000000UL
 58/*
 59 * Min HPET period is 10^5 femto sec just for safety. If it is less than this,
 60 * then 32 bit HPET counter wrapsaround in less than 0.5 sec.
 61 */
 62#define HPET_MIN_PERIOD		100000UL
 63
 64/* hpet memory map physical address */
 65extern unsigned long hpet_address;
 66extern unsigned long force_hpet_address;
 67extern bool boot_hpet_disable;
 68extern u8 hpet_blockid;
 69extern bool hpet_force_user;
 70extern bool hpet_msi_disable;
 71extern int is_hpet_enabled(void);
 72extern int hpet_enable(void);
 73extern void hpet_disable(void);
 74extern unsigned int hpet_readl(unsigned int a);
 75extern void force_hpet_resume(void);
 76
 77#ifdef CONFIG_HPET_EMULATE_RTC
 78
 79#include <linux/interrupt.h>
 80
 81typedef irqreturn_t (*rtc_irq_handler)(int interrupt, void *cookie);
 82extern int hpet_mask_rtc_irq_bit(unsigned long bit_mask);
 83extern int hpet_set_rtc_irq_bit(unsigned long bit_mask);
 84extern int hpet_set_alarm_time(unsigned char hrs, unsigned char min,
 85			       unsigned char sec);
 86extern int hpet_set_periodic_freq(unsigned long freq);
 87extern int hpet_rtc_timer_init(void);
 88extern irqreturn_t hpet_rtc_interrupt(int irq, void *dev_id);
 89extern int hpet_register_irq_handler(rtc_irq_handler handler);
 90extern void hpet_unregister_irq_handler(rtc_irq_handler handler);
 91
 92#endif /* CONFIG_HPET_EMULATE_RTC */
 93
 94#else /* CONFIG_HPET_TIMER */
 95
 96static inline int hpet_enable(void) { return 0; }
 97static inline int is_hpet_enabled(void) { return 0; }
 98#define hpet_readl(a) 0
 99#define default_setup_hpet_msi	NULL
100
101#endif
102#endif /* _ASM_X86_HPET_H */