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Commit | Line | Data |
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56d07a90 GX |
1 | /* |
2 | * OSTimer device simulation in PKUnity SoC | |
3 | * | |
4 | * Copyright (C) 2010-2012 Guan Xuetao | |
5 | * | |
6 | * This program is free software; you can redistribute it and/or modify | |
7 | * it under the terms of the GNU General Public License version 2 as | |
8 | * published by the Free Software Foundation, or any later version. | |
9 | * See the COPYING file in the top-level directory. | |
10 | */ | |
0b8fa32f | 11 | |
5af98cc5 | 12 | #include "qemu/osdep.h" |
83c9f4ca | 13 | #include "hw/sysbus.h" |
64552b6b | 14 | #include "hw/irq.h" |
83c9f4ca | 15 | #include "hw/ptimer.h" |
0b8fa32f | 16 | #include "qemu/module.h" |
3b34ee67 | 17 | #include "qemu/log.h" |
db1015e9 | 18 | #include "qom/object.h" |
56d07a90 GX |
19 | |
20 | #undef DEBUG_PUV3 | |
0d09e41a | 21 | #include "hw/unicore32/puv3.h" |
56d07a90 | 22 | |
9c9610b8 | 23 | #define TYPE_PUV3_OST "puv3_ost" |
8063396b | 24 | OBJECT_DECLARE_SIMPLE_TYPE(PUV3OSTState, PUV3_OST) |
9c9610b8 | 25 | |
56d07a90 | 26 | /* puv3 ostimer implementation. */ |
db1015e9 | 27 | struct PUV3OSTState { |
9c9610b8 AF |
28 | SysBusDevice parent_obj; |
29 | ||
56d07a90 | 30 | MemoryRegion iomem; |
56d07a90 GX |
31 | qemu_irq irq; |
32 | ptimer_state *ptimer; | |
33 | ||
34 | uint32_t reg_OSMR0; | |
35 | uint32_t reg_OSCR; | |
36 | uint32_t reg_OSSR; | |
37 | uint32_t reg_OIER; | |
db1015e9 | 38 | }; |
56d07a90 | 39 | |
a8170e5e | 40 | static uint64_t puv3_ost_read(void *opaque, hwaddr offset, |
56d07a90 GX |
41 | unsigned size) |
42 | { | |
43 | PUV3OSTState *s = opaque; | |
44 | uint32_t ret = 0; | |
45 | ||
46 | switch (offset) { | |
47 | case 0x10: /* Counter Register */ | |
48 | ret = s->reg_OSMR0 - (uint32_t)ptimer_get_count(s->ptimer); | |
49 | break; | |
50 | case 0x14: /* Status Register */ | |
51 | ret = s->reg_OSSR; | |
52 | break; | |
53 | case 0x1c: /* Interrupt Enable Register */ | |
54 | ret = s->reg_OIER; | |
55 | break; | |
56 | default: | |
3b34ee67 PMD |
57 | qemu_log_mask(LOG_GUEST_ERROR, |
58 | "%s: Bad read offset 0x%"HWADDR_PRIx"\n", | |
59 | __func__, offset); | |
56d07a90 GX |
60 | } |
61 | DPRINTF("offset 0x%x, value 0x%x\n", offset, ret); | |
62 | return ret; | |
63 | } | |
64 | ||
a8170e5e | 65 | static void puv3_ost_write(void *opaque, hwaddr offset, |
56d07a90 GX |
66 | uint64_t value, unsigned size) |
67 | { | |
68 | PUV3OSTState *s = opaque; | |
69 | ||
70 | DPRINTF("offset 0x%x, value 0x%x\n", offset, value); | |
71 | switch (offset) { | |
72 | case 0x00: /* Match Register 0 */ | |
c54dd4b7 | 73 | ptimer_transaction_begin(s->ptimer); |
56d07a90 GX |
74 | s->reg_OSMR0 = value; |
75 | if (s->reg_OSMR0 > s->reg_OSCR) { | |
76 | ptimer_set_count(s->ptimer, s->reg_OSMR0 - s->reg_OSCR); | |
77 | } else { | |
78 | ptimer_set_count(s->ptimer, s->reg_OSMR0 + | |
79 | (0xffffffff - s->reg_OSCR)); | |
80 | } | |
81 | ptimer_run(s->ptimer, 2); | |
c54dd4b7 | 82 | ptimer_transaction_commit(s->ptimer); |
56d07a90 GX |
83 | break; |
84 | case 0x14: /* Status Register */ | |
85 | assert(value == 0); | |
86 | if (s->reg_OSSR) { | |
87 | s->reg_OSSR = value; | |
88 | qemu_irq_lower(s->irq); | |
89 | } | |
90 | break; | |
91 | case 0x1c: /* Interrupt Enable Register */ | |
92 | s->reg_OIER = value; | |
93 | break; | |
94 | default: | |
3b34ee67 PMD |
95 | qemu_log_mask(LOG_GUEST_ERROR, |
96 | "%s: Bad write offset 0x%"HWADDR_PRIx"\n", | |
97 | __func__, offset); | |
56d07a90 GX |
98 | } |
99 | } | |
100 | ||
101 | static const MemoryRegionOps puv3_ost_ops = { | |
102 | .read = puv3_ost_read, | |
103 | .write = puv3_ost_write, | |
104 | .impl = { | |
105 | .min_access_size = 4, | |
106 | .max_access_size = 4, | |
107 | }, | |
108 | .endianness = DEVICE_NATIVE_ENDIAN, | |
109 | }; | |
110 | ||
111 | static void puv3_ost_tick(void *opaque) | |
112 | { | |
113 | PUV3OSTState *s = opaque; | |
114 | ||
115 | DPRINTF("ost hit when ptimer counter from 0x%x to 0x%x!\n", | |
116 | s->reg_OSCR, s->reg_OSMR0); | |
117 | ||
118 | s->reg_OSCR = s->reg_OSMR0; | |
119 | if (s->reg_OIER) { | |
120 | s->reg_OSSR = 1; | |
121 | qemu_irq_raise(s->irq); | |
122 | } | |
123 | } | |
124 | ||
30735a2b | 125 | static void puv3_ost_realize(DeviceState *dev, Error **errp) |
56d07a90 | 126 | { |
9c9610b8 | 127 | PUV3OSTState *s = PUV3_OST(dev); |
30735a2b | 128 | SysBusDevice *sbd = SYS_BUS_DEVICE(dev); |
56d07a90 GX |
129 | |
130 | s->reg_OIER = 0; | |
131 | s->reg_OSSR = 0; | |
132 | s->reg_OSMR0 = 0; | |
133 | s->reg_OSCR = 0; | |
134 | ||
30735a2b | 135 | sysbus_init_irq(sbd, &s->irq); |
56d07a90 | 136 | |
c54dd4b7 PM |
137 | s->ptimer = ptimer_init(puv3_ost_tick, s, PTIMER_POLICY_DEFAULT); |
138 | ptimer_transaction_begin(s->ptimer); | |
56d07a90 | 139 | ptimer_set_freq(s->ptimer, 50 * 1000 * 1000); |
c54dd4b7 | 140 | ptimer_transaction_commit(s->ptimer); |
56d07a90 | 141 | |
853dca12 | 142 | memory_region_init_io(&s->iomem, OBJECT(s), &puv3_ost_ops, s, "puv3_ost", |
56d07a90 | 143 | PUV3_REGS_OFFSET); |
30735a2b | 144 | sysbus_init_mmio(sbd, &s->iomem); |
56d07a90 GX |
145 | } |
146 | ||
147 | static void puv3_ost_class_init(ObjectClass *klass, void *data) | |
148 | { | |
30735a2b | 149 | DeviceClass *dc = DEVICE_CLASS(klass); |
56d07a90 | 150 | |
30735a2b | 151 | dc->realize = puv3_ost_realize; |
56d07a90 GX |
152 | } |
153 | ||
154 | static const TypeInfo puv3_ost_info = { | |
9c9610b8 | 155 | .name = TYPE_PUV3_OST, |
56d07a90 GX |
156 | .parent = TYPE_SYS_BUS_DEVICE, |
157 | .instance_size = sizeof(PUV3OSTState), | |
158 | .class_init = puv3_ost_class_init, | |
159 | }; | |
160 | ||
161 | static void puv3_ost_register_type(void) | |
162 | { | |
163 | type_register_static(&puv3_ost_info); | |
164 | } | |
165 | ||
166 | type_init(puv3_ost_register_type) |