include/asm/hpet.h

0001 /* SPDX-License-Identifier: GPL-2.0 */
0002 #ifndef _ASM_X86_HPET_H
0003 #define _ASM_X86_HPET_H
0004
0005 #include <linux/msi.h>
0006
0007 #ifdef CONFIG_HPET_TIMER
0008
0009 #define HPET_MMAP_SIZE      1024
0010
0011 #define HPET_ID         0x000
0012 #define HPET_PERIOD     0x004
0013 #define HPET_CFG        0x010
0014 #define HPET_STATUS     0x020
0015 #define HPET_COUNTER        0x0f0
0016
0017 #define HPET_Tn_CFG(n)      (0x100 + 0x20 * n)
0018 #define HPET_Tn_CMP(n)      (0x108 + 0x20 * n)
0019 #define HPET_Tn_ROUTE(n)    (0x110 + 0x20 * n)
0020
0021 #define HPET_T0_CFG     0x100
0022 #define HPET_T0_CMP     0x108
0023 #define HPET_T0_ROUTE       0x110
0024 #define HPET_T1_CFG     0x120
0025 #define HPET_T1_CMP     0x128
0026 #define HPET_T1_ROUTE       0x130
0027 #define HPET_T2_CFG     0x140
0028 #define HPET_T2_CMP     0x148
0029 #define HPET_T2_ROUTE       0x150
0030
0031 #define HPET_ID_REV     0x000000ff
0032 #define HPET_ID_NUMBER      0x00001f00
0033 #define HPET_ID_64BIT       0x00002000
0034 #define HPET_ID_LEGSUP      0x00008000
0035 #define HPET_ID_VENDOR      0xffff0000
0036 #define HPET_ID_NUMBER_SHIFT    8
0037 #define HPET_ID_VENDOR_SHIFT    16
0038
0039 #define HPET_CFG_ENABLE     0x001
0040 #define HPET_CFG_LEGACY     0x002
0041 #define HPET_LEGACY_8254    2
0042 #define HPET_LEGACY_RTC     8
0043
0044 #define HPET_TN_LEVEL       0x0002
0045 #define HPET_TN_ENABLE      0x0004
0046 #define HPET_TN_PERIODIC    0x0008
0047 #define HPET_TN_PERIODIC_CAP    0x0010
0048 #define HPET_TN_64BIT_CAP   0x0020
0049 #define HPET_TN_SETVAL      0x0040
0050 #define HPET_TN_32BIT       0x0100
0051 #define HPET_TN_ROUTE       0x3e00
0052 #define HPET_TN_FSB     0x4000
0053 #define HPET_TN_FSB_CAP     0x8000
0054 #define HPET_TN_ROUTE_SHIFT 9
0055
0056 /* Max HPET Period is 10^8 femto sec as in HPET spec */
0057 #define HPET_MAX_PERIOD     100000000UL
0058 /*
0059  * Min HPET period is 10^5 femto sec just for safety. If it is less than this,
0060  * then 32 bit HPET counter wrapsaround in less than 0.5 sec.
0061  */
0062 #define HPET_MIN_PERIOD     100000UL
0063
0064 /* hpet memory map physical address */
0065 extern unsigned long hpet_address;
0066 extern unsigned long force_hpet_address;
0067 extern bool boot_hpet_disable;
0068 extern u8 hpet_blockid;
0069 extern bool hpet_force_user;
0070 extern bool hpet_msi_disable;
0071 extern int is_hpet_enabled(void);
0072 extern int hpet_enable(void);
0073 extern void hpet_disable(void);
0074 extern unsigned int hpet_readl(unsigned int a);
0075 extern void force_hpet_resume(void);
0076
0077 #ifdef CONFIG_HPET_EMULATE_RTC
0078
0079 #include <linux/interrupt.h>
0080
0081 typedef irqreturn_t (*rtc_irq_handler)(int interrupt, void *cookie);
0082 extern int hpet_mask_rtc_irq_bit(unsigned long bit_mask);
0083 extern int hpet_set_rtc_irq_bit(unsigned long bit_mask);
0084 extern int hpet_set_alarm_time(unsigned char hrs, unsigned char min,
0085                    unsigned char sec);
0086 extern int hpet_set_periodic_freq(unsigned long freq);
0087 extern int hpet_rtc_dropped_irq(void);
0088 extern int hpet_rtc_timer_init(void);
0089 extern irqreturn_t hpet_rtc_interrupt(int irq, void *dev_id);
0090 extern int hpet_register_irq_handler(rtc_irq_handler handler);
0091 extern void hpet_unregister_irq_handler(rtc_irq_handler handler);
0092
0093 #endif /* CONFIG_HPET_EMULATE_RTC */
0094
0095 #else /* CONFIG_HPET_TIMER */
0096
0097 static inline int hpet_enable(void) { return 0; }
0098 static inline int is_hpet_enabled(void) { return 0; }
0099 #define hpet_readl(a) 0
0100 #define default_setup_hpet_msi  NULL
0101
0102 #endif
0103 #endif /* _ASM_X86_HPET_H */