meson: convert hw/vfio
[qemu.git] / hw / gpio / imx_gpio.c
1 /*
2 * i.MX processors GPIO emulation.
3 *
4 * Copyright (C) 2015 Jean-Christophe Dubois <jcd@tribudubois.net>
5 *
6 * This program is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU General Public License as
8 * published by the Free Software Foundation; either version 2 or
9 * (at your option) version 3 of the License.
10 *
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
15 *
16 * You should have received a copy of the GNU General Public License along
17 * with this program; if not, see <http://www.gnu.org/licenses/>.
18 */
19
20 #include "qemu/osdep.h"
21 #include "hw/gpio/imx_gpio.h"
22 #include "hw/irq.h"
23 #include "hw/qdev-properties.h"
24 #include "migration/vmstate.h"
25 #include "qemu/log.h"
26 #include "qemu/module.h"
27
28 #ifndef DEBUG_IMX_GPIO
29 #define DEBUG_IMX_GPIO 0
30 #endif
31
32 typedef enum IMXGPIOLevel {
33 IMX_GPIO_LEVEL_LOW = 0,
34 IMX_GPIO_LEVEL_HIGH = 1,
35 } IMXGPIOLevel;
36
37 #define DPRINTF(fmt, args...) \
38 do { \
39 if (DEBUG_IMX_GPIO) { \
40 fprintf(stderr, "[%s]%s: " fmt , TYPE_IMX_GPIO, \
41 __func__, ##args); \
42 } \
43 } while (0)
44
45 static const char *imx_gpio_reg_name(uint32_t reg)
46 {
47 switch (reg) {
48 case DR_ADDR:
49 return "DR";
50 case GDIR_ADDR:
51 return "GDIR";
52 case PSR_ADDR:
53 return "PSR";
54 case ICR1_ADDR:
55 return "ICR1";
56 case ICR2_ADDR:
57 return "ICR2";
58 case IMR_ADDR:
59 return "IMR";
60 case ISR_ADDR:
61 return "ISR";
62 case EDGE_SEL_ADDR:
63 return "EDGE_SEL";
64 default:
65 return "[?]";
66 }
67 }
68
69 static void imx_gpio_update_int(IMXGPIOState *s)
70 {
71 if (s->has_upper_pin_irq) {
72 qemu_set_irq(s->irq[0], (s->isr & s->imr & 0x0000FFFF) ? 1 : 0);
73 qemu_set_irq(s->irq[1], (s->isr & s->imr & 0xFFFF0000) ? 1 : 0);
74 } else {
75 qemu_set_irq(s->irq[0], (s->isr & s->imr) ? 1 : 0);
76 }
77 }
78
79 static void imx_gpio_set_int_line(IMXGPIOState *s, int line, IMXGPIOLevel level)
80 {
81 /* if this signal isn't configured as an input signal, nothing to do */
82 if (!extract32(s->gdir, line, 1)) {
83 return;
84 }
85
86 /* When set, EDGE_SEL overrides the ICR config */
87 if (extract32(s->edge_sel, line, 1)) {
88 /* we detect interrupt on rising and falling edge */
89 if (extract32(s->psr, line, 1) != level) {
90 /* level changed */
91 s->isr = deposit32(s->isr, line, 1, 1);
92 }
93 } else if (extract64(s->icr, 2*line + 1, 1)) {
94 /* interrupt is edge sensitive */
95 if (extract32(s->psr, line, 1) != level) {
96 /* level changed */
97 if (extract64(s->icr, 2*line, 1) != level) {
98 s->isr = deposit32(s->isr, line, 1, 1);
99 }
100 }
101 } else {
102 /* interrupt is level sensitive */
103 if (extract64(s->icr, 2*line, 1) == level) {
104 s->isr = deposit32(s->isr, line, 1, 1);
105 }
106 }
107 }
108
109 static void imx_gpio_set(void *opaque, int line, int level)
110 {
111 IMXGPIOState *s = IMX_GPIO(opaque);
112 IMXGPIOLevel imx_level = level ? IMX_GPIO_LEVEL_HIGH : IMX_GPIO_LEVEL_LOW;
113
114 imx_gpio_set_int_line(s, line, imx_level);
115
116 /* this is an input signal, so set PSR */
117 s->psr = deposit32(s->psr, line, 1, imx_level);
118
119 imx_gpio_update_int(s);
120 }
121
122 static void imx_gpio_set_all_int_lines(IMXGPIOState *s)
123 {
124 int i;
125
126 for (i = 0; i < IMX_GPIO_PIN_COUNT; i++) {
127 IMXGPIOLevel imx_level = extract32(s->psr, i, 1);
128 imx_gpio_set_int_line(s, i, imx_level);
129 }
130
131 imx_gpio_update_int(s);
132 }
133
134 static inline void imx_gpio_set_all_output_lines(IMXGPIOState *s)
135 {
136 int i;
137
138 for (i = 0; i < IMX_GPIO_PIN_COUNT; i++) {
139 /*
140 * if the line is set as output, then forward the line
141 * level to its user.
142 */
143 if (extract32(s->gdir, i, 1) && s->output[i]) {
144 qemu_set_irq(s->output[i], extract32(s->dr, i, 1));
145 }
146 }
147 }
148
149 static uint64_t imx_gpio_read(void *opaque, hwaddr offset, unsigned size)
150 {
151 IMXGPIOState *s = IMX_GPIO(opaque);
152 uint32_t reg_value = 0;
153
154 switch (offset) {
155 case DR_ADDR:
156 /*
157 * depending on the "line" configuration, the bit values
158 * are coming either from DR or PSR
159 */
160 reg_value = (s->dr & s->gdir) | (s->psr & ~s->gdir);
161 break;
162
163 case GDIR_ADDR:
164 reg_value = s->gdir;
165 break;
166
167 case PSR_ADDR:
168 reg_value = s->psr & ~s->gdir;
169 break;
170
171 case ICR1_ADDR:
172 reg_value = extract64(s->icr, 0, 32);
173 break;
174
175 case ICR2_ADDR:
176 reg_value = extract64(s->icr, 32, 32);
177 break;
178
179 case IMR_ADDR:
180 reg_value = s->imr;
181 break;
182
183 case ISR_ADDR:
184 reg_value = s->isr;
185 break;
186
187 case EDGE_SEL_ADDR:
188 if (s->has_edge_sel) {
189 reg_value = s->edge_sel;
190 } else {
191 qemu_log_mask(LOG_GUEST_ERROR, "[%s]%s: EDGE_SEL register not "
192 "present on this version of GPIO device\n",
193 TYPE_IMX_GPIO, __func__);
194 }
195 break;
196
197 default:
198 qemu_log_mask(LOG_GUEST_ERROR, "[%s]%s: Bad register at offset 0x%"
199 HWADDR_PRIx "\n", TYPE_IMX_GPIO, __func__, offset);
200 break;
201 }
202
203 DPRINTF("(%s) = 0x%" PRIx32 "\n", imx_gpio_reg_name(offset), reg_value);
204
205 return reg_value;
206 }
207
208 static void imx_gpio_write(void *opaque, hwaddr offset, uint64_t value,
209 unsigned size)
210 {
211 IMXGPIOState *s = IMX_GPIO(opaque);
212
213 DPRINTF("(%s, value = 0x%" PRIx32 ")\n", imx_gpio_reg_name(offset),
214 (uint32_t)value);
215
216 switch (offset) {
217 case DR_ADDR:
218 s->dr = value;
219 imx_gpio_set_all_output_lines(s);
220 break;
221
222 case GDIR_ADDR:
223 s->gdir = value;
224 imx_gpio_set_all_output_lines(s);
225 imx_gpio_set_all_int_lines(s);
226 break;
227
228 case ICR1_ADDR:
229 s->icr = deposit64(s->icr, 0, 32, value);
230 imx_gpio_set_all_int_lines(s);
231 break;
232
233 case ICR2_ADDR:
234 s->icr = deposit64(s->icr, 32, 32, value);
235 imx_gpio_set_all_int_lines(s);
236 break;
237
238 case IMR_ADDR:
239 s->imr = value;
240 imx_gpio_update_int(s);
241 break;
242
243 case ISR_ADDR:
244 s->isr &= ~value;
245 imx_gpio_set_all_int_lines(s);
246 break;
247
248 case EDGE_SEL_ADDR:
249 if (s->has_edge_sel) {
250 s->edge_sel = value;
251 imx_gpio_set_all_int_lines(s);
252 } else {
253 qemu_log_mask(LOG_GUEST_ERROR, "[%s]%s: EDGE_SEL register not "
254 "present on this version of GPIO device\n",
255 TYPE_IMX_GPIO, __func__);
256 }
257 break;
258
259 default:
260 qemu_log_mask(LOG_GUEST_ERROR, "[%s]%s: Bad register at offset 0x%"
261 HWADDR_PRIx "\n", TYPE_IMX_GPIO, __func__, offset);
262 break;
263 }
264
265 return;
266 }
267
268 static const MemoryRegionOps imx_gpio_ops = {
269 .read = imx_gpio_read,
270 .write = imx_gpio_write,
271 .valid.min_access_size = 4,
272 .valid.max_access_size = 4,
273 .endianness = DEVICE_NATIVE_ENDIAN,
274 };
275
276 static const VMStateDescription vmstate_imx_gpio = {
277 .name = TYPE_IMX_GPIO,
278 .version_id = 1,
279 .minimum_version_id = 1,
280 .minimum_version_id_old = 1,
281 .fields = (VMStateField[]) {
282 VMSTATE_UINT32(dr, IMXGPIOState),
283 VMSTATE_UINT32(gdir, IMXGPIOState),
284 VMSTATE_UINT32(psr, IMXGPIOState),
285 VMSTATE_UINT64(icr, IMXGPIOState),
286 VMSTATE_UINT32(imr, IMXGPIOState),
287 VMSTATE_UINT32(isr, IMXGPIOState),
288 VMSTATE_BOOL(has_edge_sel, IMXGPIOState),
289 VMSTATE_UINT32(edge_sel, IMXGPIOState),
290 VMSTATE_END_OF_LIST()
291 }
292 };
293
294 static Property imx_gpio_properties[] = {
295 DEFINE_PROP_BOOL("has-edge-sel", IMXGPIOState, has_edge_sel, true),
296 DEFINE_PROP_BOOL("has-upper-pin-irq", IMXGPIOState, has_upper_pin_irq,
297 false),
298 DEFINE_PROP_END_OF_LIST(),
299 };
300
301 static void imx_gpio_reset(DeviceState *dev)
302 {
303 IMXGPIOState *s = IMX_GPIO(dev);
304
305 s->dr = 0;
306 s->gdir = 0;
307 s->psr = 0;
308 s->icr = 0;
309 s->imr = 0;
310 s->isr = 0;
311 s->edge_sel = 0;
312
313 imx_gpio_set_all_output_lines(s);
314 imx_gpio_update_int(s);
315 }
316
317 static void imx_gpio_realize(DeviceState *dev, Error **errp)
318 {
319 IMXGPIOState *s = IMX_GPIO(dev);
320
321 memory_region_init_io(&s->iomem, OBJECT(s), &imx_gpio_ops, s,
322 TYPE_IMX_GPIO, IMX_GPIO_MEM_SIZE);
323
324 qdev_init_gpio_in(DEVICE(s), imx_gpio_set, IMX_GPIO_PIN_COUNT);
325 qdev_init_gpio_out(DEVICE(s), s->output, IMX_GPIO_PIN_COUNT);
326
327 sysbus_init_irq(SYS_BUS_DEVICE(dev), &s->irq[0]);
328 sysbus_init_irq(SYS_BUS_DEVICE(dev), &s->irq[1]);
329 sysbus_init_mmio(SYS_BUS_DEVICE(dev), &s->iomem);
330 }
331
332 static void imx_gpio_class_init(ObjectClass *klass, void *data)
333 {
334 DeviceClass *dc = DEVICE_CLASS(klass);
335
336 dc->realize = imx_gpio_realize;
337 dc->reset = imx_gpio_reset;
338 device_class_set_props(dc, imx_gpio_properties);
339 dc->vmsd = &vmstate_imx_gpio;
340 dc->desc = "i.MX GPIO controller";
341 }
342
343 static const TypeInfo imx_gpio_info = {
344 .name = TYPE_IMX_GPIO,
345 .parent = TYPE_SYS_BUS_DEVICE,
346 .instance_size = sizeof(IMXGPIOState),
347 .class_init = imx_gpio_class_init,
348 };
349
350 static void imx_gpio_register_types(void)
351 {
352 type_register_static(&imx_gpio_info);
353 }
354
355 type_init(imx_gpio_register_types)