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d1157ca4 OA |
1 | /* |
2 | * ARM Versatile I2C controller | |
3 | * | |
4 | * Copyright (c) 2006-2007 CodeSourcery. | |
5 | * Copyright (c) 2012 Oskar Andero <oskar.andero@gmail.com> | |
6 | * | |
7 | * This file is derived from hw/realview.c by Paul Brook | |
8 | * | |
9 | * This program is free software; you can redistribute it and/or | |
10 | * modify it under the terms of the GNU General Public License | |
11 | * as published by the Free Software Foundation; either version 2 | |
12 | * of the License, or (at your option) any later version. | |
13 | * | |
14 | * This program is distributed in the hope that it will be useful, | |
15 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
16 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
17 | * GNU General Public License for more details. | |
18 | * | |
19 | * You should have received a copy of the GNU General Public License | |
20 | * along with this program; if not, see <http://www.gnu.org/licenses/>. | |
21 | * | |
22 | */ | |
23 | ||
8ef94f0b | 24 | #include "qemu/osdep.h" |
83c9f4ca | 25 | #include "hw/sysbus.h" |
47b43a1f | 26 | #include "bitbang_i2c.h" |
d1157ca4 | 27 | |
93e7f5f4 AF |
28 | #define TYPE_VERSATILE_I2C "versatile_i2c" |
29 | #define VERSATILE_I2C(obj) \ | |
30 | OBJECT_CHECK(VersatileI2CState, (obj), TYPE_VERSATILE_I2C) | |
31 | ||
32 | typedef struct VersatileI2CState { | |
33 | SysBusDevice parent_obj; | |
34 | ||
d1157ca4 OA |
35 | MemoryRegion iomem; |
36 | bitbang_i2c_interface *bitbang; | |
37 | int out; | |
38 | int in; | |
39 | } VersatileI2CState; | |
40 | ||
a8170e5e | 41 | static uint64_t versatile_i2c_read(void *opaque, hwaddr offset, |
d1157ca4 OA |
42 | unsigned size) |
43 | { | |
44 | VersatileI2CState *s = (VersatileI2CState *)opaque; | |
45 | ||
46 | if (offset == 0) { | |
47 | return (s->out & 1) | (s->in << 1); | |
48 | } else { | |
5170d661 PM |
49 | qemu_log_mask(LOG_GUEST_ERROR, |
50 | "%s: Bad offset 0x%x\n", __func__, (int)offset); | |
d1157ca4 OA |
51 | return -1; |
52 | } | |
53 | } | |
54 | ||
a8170e5e | 55 | static void versatile_i2c_write(void *opaque, hwaddr offset, |
d1157ca4 OA |
56 | uint64_t value, unsigned size) |
57 | { | |
58 | VersatileI2CState *s = (VersatileI2CState *)opaque; | |
59 | ||
60 | switch (offset) { | |
61 | case 0: | |
62 | s->out |= value & 3; | |
63 | break; | |
64 | case 4: | |
65 | s->out &= ~value; | |
66 | break; | |
67 | default: | |
5170d661 PM |
68 | qemu_log_mask(LOG_GUEST_ERROR, |
69 | "%s: Bad offset 0x%x\n", __func__, (int)offset); | |
d1157ca4 OA |
70 | } |
71 | bitbang_i2c_set(s->bitbang, BITBANG_I2C_SCL, (s->out & 1) != 0); | |
72 | s->in = bitbang_i2c_set(s->bitbang, BITBANG_I2C_SDA, (s->out & 2) != 0); | |
73 | } | |
74 | ||
75 | static const MemoryRegionOps versatile_i2c_ops = { | |
76 | .read = versatile_i2c_read, | |
77 | .write = versatile_i2c_write, | |
78 | .endianness = DEVICE_NATIVE_ENDIAN, | |
79 | }; | |
80 | ||
93e7f5f4 | 81 | static int versatile_i2c_init(SysBusDevice *sbd) |
d1157ca4 | 82 | { |
93e7f5f4 AF |
83 | DeviceState *dev = DEVICE(sbd); |
84 | VersatileI2CState *s = VERSATILE_I2C(dev); | |
a5c82852 | 85 | I2CBus *bus; |
d1157ca4 | 86 | |
93e7f5f4 | 87 | bus = i2c_init_bus(dev, "i2c"); |
d1157ca4 | 88 | s->bitbang = bitbang_i2c_init(bus); |
1437c94b | 89 | memory_region_init_io(&s->iomem, OBJECT(s), &versatile_i2c_ops, s, |
d1157ca4 | 90 | "versatile_i2c", 0x1000); |
93e7f5f4 | 91 | sysbus_init_mmio(sbd, &s->iomem); |
d1157ca4 OA |
92 | return 0; |
93 | } | |
94 | ||
95 | static void versatile_i2c_class_init(ObjectClass *klass, void *data) | |
96 | { | |
97 | SysBusDeviceClass *k = SYS_BUS_DEVICE_CLASS(klass); | |
98 | ||
99 | k->init = versatile_i2c_init; | |
100 | } | |
101 | ||
102 | static const TypeInfo versatile_i2c_info = { | |
93e7f5f4 | 103 | .name = TYPE_VERSATILE_I2C, |
d1157ca4 OA |
104 | .parent = TYPE_SYS_BUS_DEVICE, |
105 | .instance_size = sizeof(VersatileI2CState), | |
106 | .class_init = versatile_i2c_class_init, | |
107 | }; | |
108 | ||
109 | static void versatile_i2c_register_types(void) | |
110 | { | |
111 | type_register_static(&versatile_i2c_info); | |
112 | } | |
113 | ||
114 | type_init(versatile_i2c_register_types) |