xref: /openbmc/qemu/include/hw/timer/hpet.h (revision e62f8ffb)
1 /*
2  * QEMU Emulated HPET support
3  *
4  * Copyright IBM, Corp. 2008
5  *
6  * Authors:
7  *  Beth Kon   <bkon@us.ibm.com>
8  *
9  * This work is licensed under the terms of the GNU GPL, version 2.  See
10  * the COPYING file in the top-level directory.
11  *
12  */
13 
14 #ifndef HW_HPET_H
15 #define HW_HPET_H
16 
17 #include "qom/object.h"
18 
19 #define HPET_BASE               0xfed00000
20 #define HPET_LEN                0x400
21 #define HPET_CLK_PERIOD         10 /* 10 ns*/
22 
23 #define FS_PER_NS 1000000       /* 1000000 femtoseconds == 1 ns */
24 #define HPET_MIN_TIMERS         3
25 #define HPET_MAX_TIMERS         32
26 
27 #define HPET_NUM_IRQ_ROUTES     32
28 
29 #define HPET_LEGACY_PIT_INT     0
30 #define HPET_LEGACY_RTC_INT     1
31 
32 #define HPET_CFG_ENABLE 0x001
33 #define HPET_CFG_LEGACY 0x002
34 
35 #define HPET_ID         0x000
36 #define HPET_PERIOD     0x004
37 #define HPET_CFG        0x010
38 #define HPET_STATUS     0x020
39 #define HPET_COUNTER    0x0f0
40 #define HPET_TN_CFG     0x000
41 #define HPET_TN_CMP     0x008
42 #define HPET_TN_ROUTE   0x010
43 #define HPET_CFG_WRITE_MASK  0x3
44 
45 #define HPET_ID_NUM_TIM_SHIFT   8
46 #define HPET_ID_NUM_TIM_MASK    0x1f00
47 
48 #define HPET_TN_TYPE_LEVEL       0x002
49 #define HPET_TN_ENABLE           0x004
50 #define HPET_TN_PERIODIC         0x008
51 #define HPET_TN_PERIODIC_CAP     0x010
52 #define HPET_TN_SIZE_CAP         0x020
53 #define HPET_TN_SETVAL           0x040
54 #define HPET_TN_32BIT            0x100
55 #define HPET_TN_INT_ROUTE_MASK  0x3e00
56 #define HPET_TN_FSB_ENABLE      0x4000
57 #define HPET_TN_FSB_CAP         0x8000
58 #define HPET_TN_CFG_WRITE_MASK  0x7f4e
59 #define HPET_TN_INT_ROUTE_SHIFT      9
60 #define HPET_TN_INT_ROUTE_CAP_SHIFT 32
61 #define HPET_TN_CFG_BITS_READONLY_OR_RESERVED 0xffff80b1U
62 
63 struct hpet_fw_entry
64 {
65     uint32_t event_timer_block_id;
66     uint64_t address;
67     uint16_t min_tick;
68     uint8_t page_prot;
69 } QEMU_PACKED;
70 
71 struct hpet_fw_config
72 {
73     uint8_t count;
74     struct hpet_fw_entry hpet[8];
75 } QEMU_PACKED;
76 
77 extern struct hpet_fw_config hpet_cfg;
78 
79 #define TYPE_HPET "hpet"
80 
81 #define HPET_INTCAP "hpet-intcap"
82 
hpet_find(void)83 static inline bool hpet_find(void)
84 {
85     return object_resolve_path_type("", TYPE_HPET, NULL);
86 }
87 
88 #endif
89