root / hw / syborg_rtc.c @ cde844fa
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1 | 4af39611 | Paul Brook | /*
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2 | 4af39611 | Paul Brook | * Syborg RTC
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3 | 4af39611 | Paul Brook | *
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4 | 4af39611 | Paul Brook | * Copyright (c) 2008 CodeSourcery
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5 | 4af39611 | Paul Brook | *
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6 | 4af39611 | Paul Brook | * Permission is hereby granted, free of charge, to any person obtaining a copy
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7 | 4af39611 | Paul Brook | * of this software and associated documentation files (the "Software"), to deal
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8 | 4af39611 | Paul Brook | * in the Software without restriction, including without limitation the rights
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9 | 4af39611 | Paul Brook | * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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10 | 4af39611 | Paul Brook | * copies of the Software, and to permit persons to whom the Software is
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11 | 4af39611 | Paul Brook | * furnished to do so, subject to the following conditions:
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12 | 4af39611 | Paul Brook | *
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13 | 4af39611 | Paul Brook | * The above copyright notice and this permission notice shall be included in
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14 | 4af39611 | Paul Brook | * all copies or substantial portions of the Software.
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15 | 4af39611 | Paul Brook | *
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16 | 4af39611 | Paul Brook | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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17 | 4af39611 | Paul Brook | * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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18 | 4af39611 | Paul Brook | * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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19 | 4af39611 | Paul Brook | * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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20 | 4af39611 | Paul Brook | * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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21 | 4af39611 | Paul Brook | * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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22 | 4af39611 | Paul Brook | * THE SOFTWARE.
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23 | 4af39611 | Paul Brook | */
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24 | 4af39611 | Paul Brook | |
25 | 4af39611 | Paul Brook | #include "sysbus.h" |
26 | 4af39611 | Paul Brook | #include "qemu-timer.h" |
27 | 4af39611 | Paul Brook | #include "syborg.h" |
28 | 4af39611 | Paul Brook | |
29 | 4af39611 | Paul Brook | enum {
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30 | 4af39611 | Paul Brook | RTC_ID = 0,
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31 | 4af39611 | Paul Brook | RTC_LATCH = 1,
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32 | 4af39611 | Paul Brook | RTC_DATA_LOW = 2,
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33 | 4af39611 | Paul Brook | RTC_DATA_HIGH = 3
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34 | 4af39611 | Paul Brook | }; |
35 | 4af39611 | Paul Brook | |
36 | 4af39611 | Paul Brook | typedef struct { |
37 | 4af39611 | Paul Brook | SysBusDevice busdev; |
38 | 43b8c30d | Benoît Canet | MemoryRegion iomem; |
39 | 4af39611 | Paul Brook | int64_t offset; |
40 | 4af39611 | Paul Brook | int64_t data; |
41 | 4af39611 | Paul Brook | qemu_irq irq; |
42 | 4af39611 | Paul Brook | } SyborgRTCState; |
43 | 4af39611 | Paul Brook | |
44 | 43b8c30d | Benoît Canet | static uint64_t syborg_rtc_read(void *opaque, target_phys_addr_t offset, |
45 | 43b8c30d | Benoît Canet | unsigned size)
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46 | 4af39611 | Paul Brook | { |
47 | 4af39611 | Paul Brook | SyborgRTCState *s = (SyborgRTCState *)opaque; |
48 | 4af39611 | Paul Brook | offset &= 0xfff;
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49 | 4af39611 | Paul Brook | switch (offset >> 2) { |
50 | 4af39611 | Paul Brook | case RTC_ID:
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51 | 4af39611 | Paul Brook | return SYBORG_ID_RTC;
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52 | 4af39611 | Paul Brook | case RTC_DATA_LOW:
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53 | 4af39611 | Paul Brook | return (uint32_t)s->data;
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54 | 4af39611 | Paul Brook | case RTC_DATA_HIGH:
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55 | 4af39611 | Paul Brook | return (uint32_t)(s->data >> 32); |
56 | 4af39611 | Paul Brook | default:
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57 | 4af39611 | Paul Brook | cpu_abort(cpu_single_env, "syborg_rtc_read: Bad offset %x\n",
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58 | 4af39611 | Paul Brook | (int)offset);
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59 | 4af39611 | Paul Brook | return 0; |
60 | 4af39611 | Paul Brook | } |
61 | 4af39611 | Paul Brook | } |
62 | 4af39611 | Paul Brook | |
63 | 43b8c30d | Benoît Canet | static void syborg_rtc_write(void *opaque, target_phys_addr_t offset, |
64 | 43b8c30d | Benoît Canet | uint64_t value, unsigned size)
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65 | 4af39611 | Paul Brook | { |
66 | 4af39611 | Paul Brook | SyborgRTCState *s = (SyborgRTCState *)opaque; |
67 | 4af39611 | Paul Brook | uint64_t now; |
68 | 4af39611 | Paul Brook | |
69 | 4af39611 | Paul Brook | offset &= 0xfff;
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70 | 4af39611 | Paul Brook | switch (offset >> 2) { |
71 | 4af39611 | Paul Brook | case RTC_LATCH:
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72 | 74475455 | Paolo Bonzini | now = qemu_get_clock_ns(vm_clock); |
73 | 4af39611 | Paul Brook | if (value >= 4) { |
74 | 4af39611 | Paul Brook | s->offset = s->data - now; |
75 | 4af39611 | Paul Brook | } else {
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76 | 4af39611 | Paul Brook | s->data = now + s->offset; |
77 | 4af39611 | Paul Brook | while (value) {
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78 | 4af39611 | Paul Brook | s->data /= 1000;
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79 | 4af39611 | Paul Brook | value--; |
80 | 4af39611 | Paul Brook | } |
81 | 4af39611 | Paul Brook | } |
82 | 4af39611 | Paul Brook | break;
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83 | 4af39611 | Paul Brook | case RTC_DATA_LOW:
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84 | 4af39611 | Paul Brook | s->data = (s->data & ~(uint64_t)0xffffffffu) | value;
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85 | 4af39611 | Paul Brook | break;
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86 | 4af39611 | Paul Brook | case RTC_DATA_HIGH:
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87 | 4af39611 | Paul Brook | s->data = (s->data & 0xffffffffu) | ((uint64_t)value << 32); |
88 | 4af39611 | Paul Brook | break;
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89 | 4af39611 | Paul Brook | default:
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90 | 4af39611 | Paul Brook | cpu_abort(cpu_single_env, "syborg_rtc_write: Bad offset %x\n",
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91 | 4af39611 | Paul Brook | (int)offset);
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92 | 4af39611 | Paul Brook | break;
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93 | 4af39611 | Paul Brook | } |
94 | 4af39611 | Paul Brook | } |
95 | 4af39611 | Paul Brook | |
96 | 43b8c30d | Benoît Canet | static const MemoryRegionOps syborg_rtc_ops = { |
97 | 43b8c30d | Benoît Canet | .read = syborg_rtc_read, |
98 | 43b8c30d | Benoît Canet | .write = syborg_rtc_write, |
99 | 43b8c30d | Benoît Canet | .endianness = DEVICE_NATIVE_ENDIAN, |
100 | 4af39611 | Paul Brook | }; |
101 | 4af39611 | Paul Brook | |
102 | 4ba673ce | Juan Quintela | static const VMStateDescription vmstate_syborg_rtc = { |
103 | 4ba673ce | Juan Quintela | .name = "syborg_keyboard",
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104 | 4ba673ce | Juan Quintela | .version_id = 1,
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105 | 4ba673ce | Juan Quintela | .minimum_version_id = 1,
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106 | 4ba673ce | Juan Quintela | .minimum_version_id_old = 1,
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107 | 4ba673ce | Juan Quintela | .fields = (VMStateField[]) { |
108 | 4ba673ce | Juan Quintela | VMSTATE_INT64(offset, SyborgRTCState), |
109 | 4ba673ce | Juan Quintela | VMSTATE_INT64(data, SyborgRTCState), |
110 | 4ba673ce | Juan Quintela | VMSTATE_END_OF_LIST() |
111 | 4ba673ce | Juan Quintela | } |
112 | 4ba673ce | Juan Quintela | }; |
113 | 4af39611 | Paul Brook | |
114 | 81a322d4 | Gerd Hoffmann | static int syborg_rtc_init(SysBusDevice *dev) |
115 | 4af39611 | Paul Brook | { |
116 | 4af39611 | Paul Brook | SyborgRTCState *s = FROM_SYSBUS(SyborgRTCState, dev); |
117 | 4af39611 | Paul Brook | struct tm tm;
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118 | 4af39611 | Paul Brook | |
119 | 43b8c30d | Benoît Canet | memory_region_init_io(&s->iomem, &syborg_rtc_ops, s, "rtc", 0x1000); |
120 | 43b8c30d | Benoît Canet | sysbus_init_mmio_region(dev, &s->iomem); |
121 | 4af39611 | Paul Brook | |
122 | 4af39611 | Paul Brook | qemu_get_timedate(&tm, 0);
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123 | 4af39611 | Paul Brook | s->offset = (uint64_t)mktime(&tm) * 1000000000;
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124 | 4af39611 | Paul Brook | |
125 | 4ba673ce | Juan Quintela | vmstate_register(&dev->qdev, -1, &vmstate_syborg_rtc, s);
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126 | 81a322d4 | Gerd Hoffmann | return 0; |
127 | 4af39611 | Paul Brook | } |
128 | 4af39611 | Paul Brook | |
129 | 4af39611 | Paul Brook | static void syborg_rtc_register_devices(void) |
130 | 4af39611 | Paul Brook | { |
131 | 4af39611 | Paul Brook | sysbus_register_dev("syborg,rtc", sizeof(SyborgRTCState), syborg_rtc_init); |
132 | 4af39611 | Paul Brook | } |
133 | 4af39611 | Paul Brook | |
134 | 4af39611 | Paul Brook | device_init(syborg_rtc_register_devices) |