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/*

 * QEMU Emulated HPET support

 *

 * Copyright IBM, Corp. 2008

 *

 * Authors:

 *  Beth Kon   <bkon@us.ibm.com>

 *

 * This work is licensed under the terms of the GNU GPL, version 2.  See

 * the COPYING file in the top-level directory.

 *

 */

#ifndef QEMU_HPET_EMUL_H

#define QEMU_HPET_EMUL_H

#define HPET_BASE               0xfed00000

#define HPET_CLK_PERIOD         10000000ULL /* 10000000 femtoseconds == 10ns*/

#define FS_PER_NS 1000000

#define HPET_NUM_TIMERS 3

#define HPET_TIMER_TYPE_LEVEL 1

#define HPET_TIMER_TYPE_EDGE 0

#define HPET_TIMER_DELIVERY_APIC 0

#define HPET_TIMER_DELIVERY_FSB 1

#define HPET_TIMER_CAP_FSB_INT_DEL (1 << 15)

#define HPET_TIMER_CAP_PER_INT (1 << 4)

#define HPET_CFG_ENABLE 0x001

#define HPET_CFG_LEGACY 0x002

#define HPET_ID         0x000

#define HPET_PERIOD     0x004

#define HPET_CFG        0x010

#define HPET_STATUS     0x020

#define HPET_COUNTER    0x0f0

#define HPET_TN_CFG     0x000

#define HPET_TN_CMP     0x008

#define HPET_TN_ROUTE   0x010

#define HPET_TN_ENABLE           0x004

#define HPET_TN_PERIODIC         0x008

#define HPET_TN_PERIODIC_CAP     0x010

#define HPET_TN_SIZE_CAP         0x020

#define HPET_TN_SETVAL           0x040

#define HPET_TN_32BIT            0x100

#define HPET_TN_INT_ROUTE_MASK  0x3e00

#define HPET_TN_INT_ROUTE_SHIFT      9

#define HPET_TN_INT_ROUTE_CAP_SHIFT 32

#define HPET_TN_CFG_BITS_READONLY_OR_RESERVED 0xffff80b1U

struct HPETState;

typedef struct HPETTimer {  /* timers */

    uint8_t tn;             /*timer number*/

    QEMUTimer *qemu_timer;

    struct HPETState *state;

    /* Memory-mapped, software visible timer registers */

    uint64_t config;        /* configuration/cap */

    uint64_t cmp;           /* comparator */

    uint64_t fsb;           /* FSB route, not supported now */

    /* Hidden register state */

    uint64_t period;        /* Last value written to comparator */

    uint8_t wrap_flag;      /* timer pop will indicate wrap for one-shot 32-bit 

                             * mode. Next pop will be actual timer expiration.

                             */ 

} HPETTimer;

typedef struct HPETState {

    uint64_t hpet_offset;

    qemu_irq *irqs;

    HPETTimer timer[HPET_NUM_TIMERS];

    /* Memory-mapped, software visible registers */

    uint64_t capability;        /* capabilities */

    uint64_t config;            /* configuration */

    uint64_t isr;               /* interrupt status reg */

    uint64_t hpet_counter;      /* main counter */

} HPETState;

#if defined TARGET_I386 || defined TARGET_X86_64

extern uint32_t hpet_in_legacy_mode(void);

extern void hpet_init(qemu_irq *irq);

#endif

#endif