xref: /openbmc/qemu/include/hw/timer/hpet.h (revision 6630bc04bccadcf868165ad6bca5a964bb69b067)

/*
 * 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 HW_HPET_H
#define HW_HPET_H

#include "qom/object.h"

#define HPET_BASE               0xfed00000
#define HPET_LEN                0x400
#define HPET_CLK_PERIOD         10 /* 10 ns*/

#define FS_PER_NS 1000000       /* 1000000 femtoseconds == 1 ns */
#define HPET_MIN_TIMERS         3
#define HPET_MAX_TIMERS         32

#define HPET_NUM_IRQ_ROUTES     32

#define HPET_LEGACY_PIT_INT     0
#define HPET_LEGACY_RTC_INT     1

#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_CFG_WRITE_MASK  0x3

#define HPET_ID_NUM_TIM_SHIFT   8
#define HPET_ID_NUM_TIM_MASK    0x1f00

#define HPET_TN_TYPE_LEVEL       0x002
#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_FSB_ENABLE      0x4000
#define HPET_TN_FSB_CAP         0x8000
#define HPET_TN_CFG_WRITE_MASK  0x7f4e
#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 hpet_fw_entry
{
    uint32_t event_timer_block_id;
    uint64_t address;
    uint16_t min_tick;
    uint8_t page_prot;
} QEMU_PACKED;

struct hpet_fw_config
{
    uint8_t count;
    struct hpet_fw_entry hpet[8];
} QEMU_PACKED;

extern struct hpet_fw_config hpet_cfg;

#define TYPE_HPET "hpet"

#define HPET_INTCAP "hpet-intcap"

static inline bool hpet_find(void)
{
    return object_resolve_path_type("", TYPE_HPET, NULL);
}

#endif