root / hw / syborg_rtc.c @ 543fc7b2
History | View | Annotate | Download (4 kB)
1 |
/*
|
---|---|
2 |
* Syborg RTC
|
3 |
*
|
4 |
* Copyright (c) 2008 CodeSourcery
|
5 |
*
|
6 |
* Permission is hereby granted, free of charge, to any person obtaining a copy
|
7 |
* of this software and associated documentation files (the "Software"), to deal
|
8 |
* in the Software without restriction, including without limitation the rights
|
9 |
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
|
10 |
* copies of the Software, and to permit persons to whom the Software is
|
11 |
* furnished to do so, subject to the following conditions:
|
12 |
*
|
13 |
* The above copyright notice and this permission notice shall be included in
|
14 |
* all copies or substantial portions of the Software.
|
15 |
*
|
16 |
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
|
17 |
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
|
18 |
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
|
19 |
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
|
20 |
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
|
21 |
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
|
22 |
* THE SOFTWARE.
|
23 |
*/
|
24 |
|
25 |
#include "sysbus.h" |
26 |
#include "qemu-timer.h" |
27 |
#include "syborg.h" |
28 |
|
29 |
enum {
|
30 |
RTC_ID = 0,
|
31 |
RTC_LATCH = 1,
|
32 |
RTC_DATA_LOW = 2,
|
33 |
RTC_DATA_HIGH = 3
|
34 |
}; |
35 |
|
36 |
typedef struct { |
37 |
SysBusDevice busdev; |
38 |
int64_t offset; |
39 |
int64_t data; |
40 |
qemu_irq irq; |
41 |
} SyborgRTCState; |
42 |
|
43 |
static uint32_t syborg_rtc_read(void *opaque, target_phys_addr_t offset) |
44 |
{ |
45 |
SyborgRTCState *s = (SyborgRTCState *)opaque; |
46 |
offset &= 0xfff;
|
47 |
switch (offset >> 2) { |
48 |
case RTC_ID:
|
49 |
return SYBORG_ID_RTC;
|
50 |
case RTC_DATA_LOW:
|
51 |
return (uint32_t)s->data;
|
52 |
case RTC_DATA_HIGH:
|
53 |
return (uint32_t)(s->data >> 32); |
54 |
default:
|
55 |
cpu_abort(cpu_single_env, "syborg_rtc_read: Bad offset %x\n",
|
56 |
(int)offset);
|
57 |
return 0; |
58 |
} |
59 |
} |
60 |
|
61 |
static void syborg_rtc_write(void *opaque, target_phys_addr_t offset, uint32_t value) |
62 |
{ |
63 |
SyborgRTCState *s = (SyborgRTCState *)opaque; |
64 |
uint64_t now; |
65 |
|
66 |
offset &= 0xfff;
|
67 |
switch (offset >> 2) { |
68 |
case RTC_LATCH:
|
69 |
now = qemu_get_clock(vm_clock); |
70 |
if (value >= 4) { |
71 |
s->offset = s->data - now; |
72 |
} else {
|
73 |
s->data = now + s->offset; |
74 |
while (value) {
|
75 |
s->data /= 1000;
|
76 |
value--; |
77 |
} |
78 |
} |
79 |
break;
|
80 |
case RTC_DATA_LOW:
|
81 |
s->data = (s->data & ~(uint64_t)0xffffffffu) | value;
|
82 |
break;
|
83 |
case RTC_DATA_HIGH:
|
84 |
s->data = (s->data & 0xffffffffu) | ((uint64_t)value << 32); |
85 |
break;
|
86 |
default:
|
87 |
cpu_abort(cpu_single_env, "syborg_rtc_write: Bad offset %x\n",
|
88 |
(int)offset);
|
89 |
break;
|
90 |
} |
91 |
} |
92 |
|
93 |
static CPUReadMemoryFunc * const syborg_rtc_readfn[] = { |
94 |
syborg_rtc_read, |
95 |
syborg_rtc_read, |
96 |
syborg_rtc_read |
97 |
}; |
98 |
|
99 |
static CPUWriteMemoryFunc * const syborg_rtc_writefn[] = { |
100 |
syborg_rtc_write, |
101 |
syborg_rtc_write, |
102 |
syborg_rtc_write |
103 |
}; |
104 |
|
105 |
static void syborg_rtc_save(QEMUFile *f, void *opaque) |
106 |
{ |
107 |
SyborgRTCState *s = opaque; |
108 |
|
109 |
qemu_put_be64(f, s->offset); |
110 |
qemu_put_be64(f, s->data); |
111 |
} |
112 |
|
113 |
static int syborg_rtc_load(QEMUFile *f, void *opaque, int version_id) |
114 |
{ |
115 |
SyborgRTCState *s = opaque; |
116 |
|
117 |
if (version_id != 1) |
118 |
return -EINVAL;
|
119 |
|
120 |
s->offset = qemu_get_be64(f); |
121 |
s->data = qemu_get_be64(f); |
122 |
|
123 |
return 0; |
124 |
} |
125 |
|
126 |
static int syborg_rtc_init(SysBusDevice *dev) |
127 |
{ |
128 |
SyborgRTCState *s = FROM_SYSBUS(SyborgRTCState, dev); |
129 |
struct tm tm;
|
130 |
int iomemtype;
|
131 |
|
132 |
iomemtype = cpu_register_io_memory(syborg_rtc_readfn, |
133 |
syborg_rtc_writefn, s); |
134 |
sysbus_init_mmio(dev, 0x1000, iomemtype);
|
135 |
|
136 |
qemu_get_timedate(&tm, 0);
|
137 |
s->offset = (uint64_t)mktime(&tm) * 1000000000;
|
138 |
|
139 |
register_savevm("syborg_rtc", -1, 1, syborg_rtc_save, syborg_rtc_load, s); |
140 |
return 0; |
141 |
} |
142 |
|
143 |
static void syborg_rtc_register_devices(void) |
144 |
{ |
145 |
sysbus_register_dev("syborg,rtc", sizeof(SyborgRTCState), syborg_rtc_init); |
146 |
} |
147 |
|
148 |
device_init(syborg_rtc_register_devices) |