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1/*
2 * QEMU GRLIB IRQMP Emulator
3 *
4 * (Multiprocessor and extended interrupt not supported)
5 *
6 * Copyright (c) 2010-2011 AdaCore
7 *
8 * Permission is hereby granted, free of charge, to any person obtaining a copy
9 * of this software and associated documentation files (the "Software"), to deal
10 * in the Software without restriction, including without limitation the rights
11 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
12 * copies of the Software, and to permit persons to whom the Software is
13 * furnished to do so, subject to the following conditions:
14 *
15 * The above copyright notice and this permission notice shall be included in
16 * all copies or substantial portions of the Software.
17 *
18 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
19 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
20 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
21 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
22 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
23 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
24 * THE SOFTWARE.
25 */
26
db5ebe5f 27#include "qemu/osdep.h"
83c9f4ca 28#include "hw/sysbus.h"
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29#include "cpu.h"
30
0d09e41a 31#include "hw/sparc/grlib.h"
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32
33#include "trace.h"
22c70d8a 34#include "qapi/error.h"
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35
36#define IRQMP_MAX_CPU 16
37#define IRQMP_REG_SIZE 256 /* Size of memory mapped registers */
38
39/* Memory mapped register offsets */
40#define LEVEL_OFFSET 0x00
41#define PENDING_OFFSET 0x04
42#define FORCE0_OFFSET 0x08
43#define CLEAR_OFFSET 0x0C
44#define MP_STATUS_OFFSET 0x10
45#define BROADCAST_OFFSET 0x14
46#define MASK_OFFSET 0x40
47#define FORCE_OFFSET 0x80
48#define EXTENDED_OFFSET 0xC0
49
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50#define TYPE_GRLIB_IRQMP "grlib,irqmp"
51#define GRLIB_IRQMP(obj) OBJECT_CHECK(IRQMP, (obj), TYPE_GRLIB_IRQMP)
52
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53typedef struct IRQMPState IRQMPState;
54
55typedef struct IRQMP {
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56 SysBusDevice parent_obj;
57
847b52c1 58 MemoryRegion iomem;
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59
60 void *set_pil_in;
61 void *set_pil_in_opaque;
62
63 IRQMPState *state;
64} IRQMP;
65
66struct IRQMPState {
67 uint32_t level;
68 uint32_t pending;
69 uint32_t clear;
70 uint32_t broadcast;
71
72 uint32_t mask[IRQMP_MAX_CPU];
73 uint32_t force[IRQMP_MAX_CPU];
74 uint32_t extended[IRQMP_MAX_CPU];
75
76 IRQMP *parent;
77};
78
79static void grlib_irqmp_check_irqs(IRQMPState *state)
80{
81 uint32_t pend = 0;
82 uint32_t level0 = 0;
83 uint32_t level1 = 0;
84 set_pil_in_fn set_pil_in;
85
86 assert(state != NULL);
87 assert(state->parent != NULL);
88
89 /* IRQ for CPU 0 (no SMP support) */
90 pend = (state->pending | state->force[0])
91 & state->mask[0];
92
93 level0 = pend & ~state->level;
94 level1 = pend & state->level;
95
96 trace_grlib_irqmp_check_irqs(state->pending, state->force[0],
97 state->mask[0], level1, level0);
98
99 set_pil_in = (set_pil_in_fn)state->parent->set_pil_in;
100
101 /* Trigger level1 interrupt first and level0 if there is no level1 */
102 if (level1 != 0) {
103 set_pil_in(state->parent->set_pil_in_opaque, level1);
104 } else {
105 set_pil_in(state->parent->set_pil_in_opaque, level0);
106 }
107}
108
109void grlib_irqmp_ack(DeviceState *dev, int intno)
110{
730bf932 111 IRQMP *irqmp = GRLIB_IRQMP(dev);
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112 IRQMPState *state;
113 uint32_t mask;
114
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115 state = irqmp->state;
116 assert(state != NULL);
117
118 intno &= 15;
119 mask = 1 << intno;
120
121 trace_grlib_irqmp_ack(intno);
122
123 /* Clear registers */
124 state->pending &= ~mask;
125 state->force[0] &= ~mask; /* Only CPU 0 (No SMP support) */
126
127 grlib_irqmp_check_irqs(state);
128}
129
130void grlib_irqmp_set_irq(void *opaque, int irq, int level)
131{
730bf932 132 IRQMP *irqmp = GRLIB_IRQMP(opaque);
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133 IRQMPState *s;
134 int i = 0;
135
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136 s = irqmp->state;
137 assert(s != NULL);
138 assert(s->parent != NULL);
139
140
141 if (level) {
142 trace_grlib_irqmp_set_irq(irq);
143
144 if (s->broadcast & 1 << irq) {
145 /* Broadcasted IRQ */
146 for (i = 0; i < IRQMP_MAX_CPU; i++) {
147 s->force[i] |= 1 << irq;
148 }
149 } else {
150 s->pending |= 1 << irq;
151 }
152 grlib_irqmp_check_irqs(s);
153
154 }
155}
156
a8170e5e 157static uint64_t grlib_irqmp_read(void *opaque, hwaddr addr,
847b52c1 158 unsigned size)
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159{
160 IRQMP *irqmp = opaque;
161 IRQMPState *state;
162
163 assert(irqmp != NULL);
164 state = irqmp->state;
165 assert(state != NULL);
166
167 addr &= 0xff;
168
169 /* global registers */
170 switch (addr) {
171 case LEVEL_OFFSET:
172 return state->level;
173
174 case PENDING_OFFSET:
175 return state->pending;
176
177 case FORCE0_OFFSET:
178 /* This register is an "alias" for the force register of CPU 0 */
179 return state->force[0];
180
181 case CLEAR_OFFSET:
182 case MP_STATUS_OFFSET:
183 /* Always read as 0 */
184 return 0;
185
186 case BROADCAST_OFFSET:
187 return state->broadcast;
188
189 default:
190 break;
191 }
192
193 /* mask registers */
194 if (addr >= MASK_OFFSET && addr < FORCE_OFFSET) {
195 int cpu = (addr - MASK_OFFSET) / 4;
196 assert(cpu >= 0 && cpu < IRQMP_MAX_CPU);
197
198 return state->mask[cpu];
199 }
200
201 /* force registers */
202 if (addr >= FORCE_OFFSET && addr < EXTENDED_OFFSET) {
203 int cpu = (addr - FORCE_OFFSET) / 4;
204 assert(cpu >= 0 && cpu < IRQMP_MAX_CPU);
205
206 return state->force[cpu];
207 }
208
209 /* extended (not supported) */
210 if (addr >= EXTENDED_OFFSET && addr < IRQMP_REG_SIZE) {
211 int cpu = (addr - EXTENDED_OFFSET) / 4;
212 assert(cpu >= 0 && cpu < IRQMP_MAX_CPU);
213
214 return state->extended[cpu];
215 }
216
b4548fcc 217 trace_grlib_irqmp_readl_unknown(addr);
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218 return 0;
219}
220
a8170e5e 221static void grlib_irqmp_write(void *opaque, hwaddr addr,
847b52c1 222 uint64_t value, unsigned size)
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223{
224 IRQMP *irqmp = opaque;
225 IRQMPState *state;
226
227 assert(irqmp != NULL);
228 state = irqmp->state;
229 assert(state != NULL);
230
231 addr &= 0xff;
232
233 /* global registers */
234 switch (addr) {
235 case LEVEL_OFFSET:
236 value &= 0xFFFF << 1; /* clean up the value */
237 state->level = value;
238 return;
239
240 case PENDING_OFFSET:
241 /* Read Only */
242 return;
243
244 case FORCE0_OFFSET:
245 /* This register is an "alias" for the force register of CPU 0 */
246
247 value &= 0xFFFE; /* clean up the value */
248 state->force[0] = value;
249 grlib_irqmp_check_irqs(irqmp->state);
250 return;
251
252 case CLEAR_OFFSET:
253 value &= ~1; /* clean up the value */
254 state->pending &= ~value;
255 return;
256
257 case MP_STATUS_OFFSET:
258 /* Read Only (no SMP support) */
259 return;
260
261 case BROADCAST_OFFSET:
262 value &= 0xFFFE; /* clean up the value */
263 state->broadcast = value;
264 return;
265
266 default:
267 break;
268 }
269
270 /* mask registers */
271 if (addr >= MASK_OFFSET && addr < FORCE_OFFSET) {
272 int cpu = (addr - MASK_OFFSET) / 4;
273 assert(cpu >= 0 && cpu < IRQMP_MAX_CPU);
274
275 value &= ~1; /* clean up the value */
276 state->mask[cpu] = value;
277 grlib_irqmp_check_irqs(irqmp->state);
278 return;
279 }
280
281 /* force registers */
282 if (addr >= FORCE_OFFSET && addr < EXTENDED_OFFSET) {
283 int cpu = (addr - FORCE_OFFSET) / 4;
284 assert(cpu >= 0 && cpu < IRQMP_MAX_CPU);
285
286 uint32_t force = value & 0xFFFE;
287 uint32_t clear = (value >> 16) & 0xFFFE;
288 uint32_t old = state->force[cpu];
289
290 state->force[cpu] = (old | force) & ~clear;
291 grlib_irqmp_check_irqs(irqmp->state);
292 return;
293 }
294
295 /* extended (not supported) */
296 if (addr >= EXTENDED_OFFSET && addr < IRQMP_REG_SIZE) {
297 int cpu = (addr - EXTENDED_OFFSET) / 4;
298 assert(cpu >= 0 && cpu < IRQMP_MAX_CPU);
299
300 value &= 0xF; /* clean up the value */
301 state->extended[cpu] = value;
302 return;
303 }
304
b4548fcc 305 trace_grlib_irqmp_writel_unknown(addr, value);
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306}
307
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308static const MemoryRegionOps grlib_irqmp_ops = {
309 .read = grlib_irqmp_read,
310 .write = grlib_irqmp_write,
311 .endianness = DEVICE_NATIVE_ENDIAN,
312 .valid = {
313 .min_access_size = 4,
314 .max_access_size = 4,
315 },
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316};
317
318static void grlib_irqmp_reset(DeviceState *d)
319{
730bf932 320 IRQMP *irqmp = GRLIB_IRQMP(d);
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321 assert(irqmp->state != NULL);
322
323 memset(irqmp->state, 0, sizeof *irqmp->state);
324 irqmp->state->parent = irqmp;
325}
326
22c70d8a 327static void grlib_irqmp_init(Object *obj)
3f10bcbb 328{
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329 IRQMP *irqmp = GRLIB_IRQMP(obj);
330 SysBusDevice *dev = SYS_BUS_DEVICE(obj);
3f10bcbb 331
22c70d8a 332 memory_region_init_io(&irqmp->iomem, obj, &grlib_irqmp_ops, irqmp,
847b52c1 333 "irqmp", IRQMP_REG_SIZE);
3f10bcbb 334
7267c094 335 irqmp->state = g_malloc0(sizeof *irqmp->state);
3f10bcbb 336
750ecd44 337 sysbus_init_mmio(dev, &irqmp->iomem);
22c70d8a 338}
3f10bcbb 339
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340static void grlib_irqmp_realize(DeviceState *dev, Error **errp)
341{
342 IRQMP *irqmp = GRLIB_IRQMP(dev);
343
344 /* Check parameters */
345 if (irqmp->set_pil_in == NULL) {
346 error_setg(errp, "set_pil_in cannot be NULL.");
347 }
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348}
349
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350static Property grlib_irqmp_properties[] = {
351 DEFINE_PROP_PTR("set_pil_in", IRQMP, set_pil_in),
352 DEFINE_PROP_PTR("set_pil_in_opaque", IRQMP, set_pil_in_opaque),
353 DEFINE_PROP_END_OF_LIST(),
354};
355
356static void grlib_irqmp_class_init(ObjectClass *klass, void *data)
357{
39bffca2 358 DeviceClass *dc = DEVICE_CLASS(klass);
999e12bb 359
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360 dc->reset = grlib_irqmp_reset;
361 dc->props = grlib_irqmp_properties;
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362 /* Reason: pointer properties "set_pil_in", "set_pil_in_opaque" */
363 dc->cannot_instantiate_with_device_add_yet = true;
22c70d8a 364 dc->realize = grlib_irqmp_realize;
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365}
366
8c43a6f0 367static const TypeInfo grlib_irqmp_info = {
730bf932 368 .name = TYPE_GRLIB_IRQMP,
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369 .parent = TYPE_SYS_BUS_DEVICE,
370 .instance_size = sizeof(IRQMP),
22c70d8a 371 .instance_init = grlib_irqmp_init,
39bffca2 372 .class_init = grlib_irqmp_class_init,
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373};
374
83f7d43a 375static void grlib_irqmp_register_types(void)
3f10bcbb 376{
39bffca2 377 type_register_static(&grlib_irqmp_info);
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378}
379
83f7d43a 380type_init(grlib_irqmp_register_types)
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