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228aa992 AG |
1 | /* |
2 | * GPIO Controller for a lot of Freescale SoCs | |
3 | * | |
4 | * Copyright (C) 2014 Freescale Semiconductor, Inc. All rights reserved. | |
5 | * | |
6 | * Author: Alexander Graf, <agraf@suse.de> | |
7 | * | |
8 | * This library is free software; you can redistribute it and/or | |
9 | * modify it under the terms of the GNU Lesser General Public | |
10 | * License as published by the Free Software Foundation; either | |
11 | * version 2 of the License, or (at your option) any later version. | |
12 | * | |
13 | * This library is distributed in the hope that it will be useful, | |
14 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
16 | * Lesser General Public License for more details. | |
17 | * | |
18 | * You should have received a copy of the GNU Lesser General Public | |
19 | * License along with this library; if not, see <http://www.gnu.org/licenses/>. | |
20 | */ | |
21 | ||
0430891c | 22 | #include "qemu/osdep.h" |
64552b6b | 23 | #include "hw/irq.h" |
228aa992 | 24 | #include "hw/sysbus.h" |
d6454270 | 25 | #include "migration/vmstate.h" |
0b8fa32f | 26 | #include "qemu/module.h" |
228aa992 AG |
27 | |
28 | #define TYPE_MPC8XXX_GPIO "mpc8xxx_gpio" | |
29 | #define MPC8XXX_GPIO(obj) OBJECT_CHECK(MPC8XXXGPIOState, (obj), TYPE_MPC8XXX_GPIO) | |
30 | ||
31 | typedef struct MPC8XXXGPIOState { | |
32 | SysBusDevice parent_obj; | |
33 | ||
34 | MemoryRegion iomem; | |
35 | qemu_irq irq; | |
36 | qemu_irq out[32]; | |
37 | ||
38 | uint32_t dir; | |
39 | uint32_t odr; | |
40 | uint32_t dat; | |
41 | uint32_t ier; | |
42 | uint32_t imr; | |
43 | uint32_t icr; | |
44 | } MPC8XXXGPIOState; | |
45 | ||
46 | static const VMStateDescription vmstate_mpc8xxx_gpio = { | |
47 | .name = "mpc8xxx_gpio", | |
48 | .version_id = 1, | |
49 | .minimum_version_id = 1, | |
50 | .fields = (VMStateField[]) { | |
51 | VMSTATE_UINT32(dir, MPC8XXXGPIOState), | |
52 | VMSTATE_UINT32(odr, MPC8XXXGPIOState), | |
53 | VMSTATE_UINT32(dat, MPC8XXXGPIOState), | |
54 | VMSTATE_UINT32(ier, MPC8XXXGPIOState), | |
55 | VMSTATE_UINT32(imr, MPC8XXXGPIOState), | |
56 | VMSTATE_UINT32(icr, MPC8XXXGPIOState), | |
57 | VMSTATE_END_OF_LIST() | |
58 | } | |
59 | }; | |
60 | ||
61 | static void mpc8xxx_gpio_update(MPC8XXXGPIOState *s) | |
62 | { | |
63 | qemu_set_irq(s->irq, !!(s->ier & s->imr)); | |
64 | } | |
65 | ||
66 | static uint64_t mpc8xxx_gpio_read(void *opaque, hwaddr offset, | |
67 | unsigned size) | |
68 | { | |
69 | MPC8XXXGPIOState *s = (MPC8XXXGPIOState *)opaque; | |
70 | ||
71 | if (size != 4) { | |
72 | /* All registers are 32bit */ | |
73 | return 0; | |
74 | } | |
75 | ||
76 | switch (offset) { | |
77 | case 0x0: /* Direction */ | |
78 | return s->dir; | |
79 | case 0x4: /* Open Drain */ | |
80 | return s->odr; | |
81 | case 0x8: /* Data */ | |
82 | return s->dat; | |
83 | case 0xC: /* Interrupt Event */ | |
84 | return s->ier; | |
85 | case 0x10: /* Interrupt Mask */ | |
86 | return s->imr; | |
87 | case 0x14: /* Interrupt Control */ | |
88 | return s->icr; | |
89 | default: | |
90 | return 0; | |
91 | } | |
92 | } | |
93 | ||
94 | static void mpc8xxx_write_data(MPC8XXXGPIOState *s, uint32_t new_data) | |
95 | { | |
96 | uint32_t old_data = s->dat; | |
97 | uint32_t diff = old_data ^ new_data; | |
98 | int i; | |
99 | ||
100 | for (i = 0; i < 32; i++) { | |
101 | uint32_t mask = 0x80000000 >> i; | |
102 | if (!(diff & mask)) { | |
103 | continue; | |
104 | } | |
105 | ||
106 | if (s->dir & mask) { | |
107 | /* Output */ | |
108 | qemu_set_irq(s->out[i], (new_data & mask) != 0); | |
109 | } | |
110 | } | |
111 | ||
112 | s->dat = new_data; | |
113 | } | |
114 | ||
115 | static void mpc8xxx_gpio_write(void *opaque, hwaddr offset, | |
116 | uint64_t value, unsigned size) | |
117 | { | |
118 | MPC8XXXGPIOState *s = (MPC8XXXGPIOState *)opaque; | |
119 | ||
120 | if (size != 4) { | |
121 | /* All registers are 32bit */ | |
122 | return; | |
123 | } | |
124 | ||
125 | switch (offset) { | |
126 | case 0x0: /* Direction */ | |
127 | s->dir = value; | |
128 | break; | |
129 | case 0x4: /* Open Drain */ | |
130 | s->odr = value; | |
131 | break; | |
132 | case 0x8: /* Data */ | |
133 | mpc8xxx_write_data(s, value); | |
134 | break; | |
135 | case 0xC: /* Interrupt Event */ | |
136 | s->ier &= ~value; | |
137 | break; | |
138 | case 0x10: /* Interrupt Mask */ | |
139 | s->imr = value; | |
140 | break; | |
141 | case 0x14: /* Interrupt Control */ | |
142 | s->icr = value; | |
143 | break; | |
144 | } | |
145 | ||
146 | mpc8xxx_gpio_update(s); | |
147 | } | |
148 | ||
396781f6 | 149 | static void mpc8xxx_gpio_reset(DeviceState *dev) |
228aa992 | 150 | { |
396781f6 XZ |
151 | MPC8XXXGPIOState *s = MPC8XXX_GPIO(dev); |
152 | ||
228aa992 AG |
153 | s->dir = 0; |
154 | s->odr = 0; | |
155 | s->dat = 0; | |
156 | s->ier = 0; | |
157 | s->imr = 0; | |
158 | s->icr = 0; | |
159 | } | |
160 | ||
161 | static void mpc8xxx_gpio_set_irq(void * opaque, int irq, int level) | |
162 | { | |
163 | MPC8XXXGPIOState *s = (MPC8XXXGPIOState *)opaque; | |
164 | uint32_t mask; | |
165 | ||
166 | mask = 0x80000000 >> irq; | |
167 | if ((s->dir & mask) == 0) { | |
168 | uint32_t old_value = s->dat & mask; | |
169 | ||
170 | s->dat &= ~mask; | |
171 | if (level) | |
172 | s->dat |= mask; | |
173 | ||
174 | if (!(s->icr & irq) || (old_value && !level)) { | |
175 | s->ier |= mask; | |
176 | } | |
177 | ||
178 | mpc8xxx_gpio_update(s); | |
179 | } | |
180 | } | |
181 | ||
182 | static const MemoryRegionOps mpc8xxx_gpio_ops = { | |
183 | .read = mpc8xxx_gpio_read, | |
184 | .write = mpc8xxx_gpio_write, | |
185 | .endianness = DEVICE_BIG_ENDIAN, | |
186 | }; | |
187 | ||
396781f6 | 188 | static void mpc8xxx_gpio_initfn(Object *obj) |
228aa992 | 189 | { |
396781f6 XZ |
190 | DeviceState *dev = DEVICE(obj); |
191 | MPC8XXXGPIOState *s = MPC8XXX_GPIO(obj); | |
192 | SysBusDevice *sbd = SYS_BUS_DEVICE(obj); | |
228aa992 | 193 | |
396781f6 XZ |
194 | memory_region_init_io(&s->iomem, obj, &mpc8xxx_gpio_ops, |
195 | s, "mpc8xxx_gpio", 0x1000); | |
228aa992 AG |
196 | sysbus_init_mmio(sbd, &s->iomem); |
197 | sysbus_init_irq(sbd, &s->irq); | |
198 | qdev_init_gpio_in(dev, mpc8xxx_gpio_set_irq, 32); | |
199 | qdev_init_gpio_out(dev, s->out, 32); | |
228aa992 AG |
200 | } |
201 | ||
202 | static void mpc8xxx_gpio_class_init(ObjectClass *klass, void *data) | |
203 | { | |
204 | DeviceClass *dc = DEVICE_CLASS(klass); | |
228aa992 | 205 | |
228aa992 | 206 | dc->vmsd = &vmstate_mpc8xxx_gpio; |
396781f6 | 207 | dc->reset = mpc8xxx_gpio_reset; |
228aa992 AG |
208 | } |
209 | ||
210 | static const TypeInfo mpc8xxx_gpio_info = { | |
211 | .name = TYPE_MPC8XXX_GPIO, | |
212 | .parent = TYPE_SYS_BUS_DEVICE, | |
213 | .instance_size = sizeof(MPC8XXXGPIOState), | |
396781f6 | 214 | .instance_init = mpc8xxx_gpio_initfn, |
228aa992 AG |
215 | .class_init = mpc8xxx_gpio_class_init, |
216 | }; | |
217 | ||
218 | static void mpc8xxx_gpio_register_types(void) | |
219 | { | |
220 | type_register_static(&mpc8xxx_gpio_info); | |
221 | } | |
222 | ||
223 | type_init(mpc8xxx_gpio_register_types) |