hpet.h

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#ifndef _ASM_X86_HPET_H
#define _ASM_X86_HPET_H

#include <linux/msi.h>

#ifdef CONFIG_HPET_TIMER

#define HPET_MMAP_SIZE      1024

#define HPET_ID         0x000
#define HPET_PERIOD     0x004
#define HPET_CFG        0x010
#define HPET_STATUS     0x020
#define HPET_COUNTER        0x0f0

#define HPET_Tn_CFG(n)      (0x100 + 0x20 * n)
#define HPET_Tn_CMP(n)      (0x108 + 0x20 * n)
#define HPET_Tn_ROUTE(n)    (0x110 + 0x20 * n)

#define HPET_T0_CFG     0x100
#define HPET_T0_CMP     0x108
#define HPET_T0_ROUTE       0x110
#define HPET_T1_CFG     0x120
#define HPET_T1_CMP     0x128
#define HPET_T1_ROUTE       0x130
#define HPET_T2_CFG     0x140
#define HPET_T2_CMP     0x148
#define HPET_T2_ROUTE       0x150

#define HPET_ID_REV     0x000000ff
#define HPET_ID_NUMBER      0x00001f00
#define HPET_ID_64BIT       0x00002000
#define HPET_ID_LEGSUP      0x00008000
#define HPET_ID_VENDOR      0xffff0000
#define HPET_ID_NUMBER_SHIFT    8
#define HPET_ID_VENDOR_SHIFT    16

#define HPET_CFG_ENABLE     0x001
#define HPET_CFG_LEGACY     0x002
#define HPET_LEGACY_8254    2
#define HPET_LEGACY_RTC     8

#define HPET_TN_LEVEL       0x0002
#define HPET_TN_ENABLE      0x0004
#define HPET_TN_PERIODIC    0x0008
#define HPET_TN_PERIODIC_CAP    0x0010
#define HPET_TN_64BIT_CAP   0x0020
#define HPET_TN_SETVAL      0x0040
#define HPET_TN_32BIT       0x0100
#define HPET_TN_ROUTE       0x3e00
#define HPET_TN_FSB     0x4000
#define HPET_TN_FSB_CAP     0x8000
#define HPET_TN_ROUTE_SHIFT 9

/* Max HPET Period is 10^8 femto sec as in HPET spec */
#define HPET_MAX_PERIOD     100000000UL
/*
 * Min HPET period is 10^5 femto sec just for safety. If it is less than this,
 * then 32 bit HPET counter wrapsaround in less than 0.5 sec.
 */
#define HPET_MIN_PERIOD     100000UL

/* hpet memory map physical address */
extern unsigned long hpet_address;
extern unsigned long force_hpet_address;
extern u8 hpet_blockid;
extern int hpet_force_user;
extern u8 hpet_msi_disable;
extern int is_hpet_enabled(void);
extern int hpet_enable(void);
extern void hpet_disable(void);
extern unsigned int hpet_readl(unsigned int a);
extern void force_hpet_resume(void);

struct irq_data;
extern void hpet_msi_unmask(struct irq_data *data);
extern void hpet_msi_mask(struct irq_data *data);
struct hpet_dev;
extern void hpet_msi_write(struct hpet_dev *hdev, struct msi_msg *msg);
extern void hpet_msi_read(struct hpet_dev *hdev, struct msi_msg *msg);

#ifdef CONFIG_PCI_MSI
extern int arch_setup_hpet_msi(unsigned int irq, unsigned int id);
#else
static inline int arch_setup_hpet_msi(unsigned int irq, unsigned int id)
{
    return -EINVAL;
}
#endif

#ifdef CONFIG_HPET_EMULATE_RTC

#include <linux/interrupt.h>

typedef irqreturn_t (*rtc_irq_handler)(int interrupt, void *cookie);
extern int hpet_mask_rtc_irq_bit(unsigned long bit_mask);
extern int hpet_set_rtc_irq_bit(unsigned long bit_mask);
extern int hpet_set_alarm_time(unsigned char hrs, unsigned char min,
                   unsigned char sec);
extern int hpet_set_periodic_freq(unsigned long freq);
extern int hpet_rtc_dropped_irq(void);
extern int hpet_rtc_timer_init(void);
extern irqreturn_t hpet_rtc_interrupt(int irq, void *dev_id);
extern int hpet_register_irq_handler(rtc_irq_handler handler);
extern void hpet_unregister_irq_handler(rtc_irq_handler handler);

#endif /* CONFIG_HPET_EMULATE_RTC */

#else /* CONFIG_HPET_TIMER */

static inline int hpet_enable(void) { return 0; }
static inline int is_hpet_enabled(void) { return 0; }
#define hpet_readl(a) 0

#endif
#endif /* _ASM_X86_HPET_H */