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[qemu.git] / hw / intc / grlib_irqmp.c
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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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AF
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
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109static void grlib_irqmp_ack_mask(IRQMPState *state, uint32_t mask)
110{
111 /* Clear registers */
112 state->pending &= ~mask;
113 state->force[0] &= ~mask; /* Only CPU 0 (No SMP support) */
114
115 grlib_irqmp_check_irqs(state);
116}
117
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118void grlib_irqmp_ack(DeviceState *dev, int intno)
119{
730bf932 120 IRQMP *irqmp = GRLIB_IRQMP(dev);
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121 IRQMPState *state;
122 uint32_t mask;
123
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124 state = irqmp->state;
125 assert(state != NULL);
126
127 intno &= 15;
128 mask = 1 << intno;
129
130 trace_grlib_irqmp_ack(intno);
131
05b9ec96 132 grlib_irqmp_ack_mask(state, mask);
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133}
134
135void grlib_irqmp_set_irq(void *opaque, int irq, int level)
136{
730bf932 137 IRQMP *irqmp = GRLIB_IRQMP(opaque);
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138 IRQMPState *s;
139 int i = 0;
140
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141 s = irqmp->state;
142 assert(s != NULL);
143 assert(s->parent != NULL);
144
145
146 if (level) {
147 trace_grlib_irqmp_set_irq(irq);
148
149 if (s->broadcast & 1 << irq) {
150 /* Broadcasted IRQ */
151 for (i = 0; i < IRQMP_MAX_CPU; i++) {
152 s->force[i] |= 1 << irq;
153 }
154 } else {
155 s->pending |= 1 << irq;
156 }
157 grlib_irqmp_check_irqs(s);
158
159 }
160}
161
a8170e5e 162static uint64_t grlib_irqmp_read(void *opaque, hwaddr addr,
847b52c1 163 unsigned size)
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164{
165 IRQMP *irqmp = opaque;
166 IRQMPState *state;
167
168 assert(irqmp != NULL);
169 state = irqmp->state;
170 assert(state != NULL);
171
172 addr &= 0xff;
173
174 /* global registers */
175 switch (addr) {
176 case LEVEL_OFFSET:
177 return state->level;
178
179 case PENDING_OFFSET:
180 return state->pending;
181
182 case FORCE0_OFFSET:
183 /* This register is an "alias" for the force register of CPU 0 */
184 return state->force[0];
185
186 case CLEAR_OFFSET:
187 case MP_STATUS_OFFSET:
188 /* Always read as 0 */
189 return 0;
190
191 case BROADCAST_OFFSET:
192 return state->broadcast;
193
194 default:
195 break;
196 }
197
198 /* mask registers */
199 if (addr >= MASK_OFFSET && addr < FORCE_OFFSET) {
200 int cpu = (addr - MASK_OFFSET) / 4;
201 assert(cpu >= 0 && cpu < IRQMP_MAX_CPU);
202
203 return state->mask[cpu];
204 }
205
206 /* force registers */
207 if (addr >= FORCE_OFFSET && addr < EXTENDED_OFFSET) {
208 int cpu = (addr - FORCE_OFFSET) / 4;
209 assert(cpu >= 0 && cpu < IRQMP_MAX_CPU);
210
211 return state->force[cpu];
212 }
213
214 /* extended (not supported) */
215 if (addr >= EXTENDED_OFFSET && addr < IRQMP_REG_SIZE) {
216 int cpu = (addr - EXTENDED_OFFSET) / 4;
217 assert(cpu >= 0 && cpu < IRQMP_MAX_CPU);
218
219 return state->extended[cpu];
220 }
221
b4548fcc 222 trace_grlib_irqmp_readl_unknown(addr);
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223 return 0;
224}
225
a8170e5e 226static void grlib_irqmp_write(void *opaque, hwaddr addr,
847b52c1 227 uint64_t value, unsigned size)
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228{
229 IRQMP *irqmp = opaque;
230 IRQMPState *state;
231
232 assert(irqmp != NULL);
233 state = irqmp->state;
234 assert(state != NULL);
235
236 addr &= 0xff;
237
238 /* global registers */
239 switch (addr) {
240 case LEVEL_OFFSET:
241 value &= 0xFFFF << 1; /* clean up the value */
242 state->level = value;
243 return;
244
245 case PENDING_OFFSET:
246 /* Read Only */
247 return;
248
249 case FORCE0_OFFSET:
250 /* This register is an "alias" for the force register of CPU 0 */
251
252 value &= 0xFFFE; /* clean up the value */
253 state->force[0] = value;
254 grlib_irqmp_check_irqs(irqmp->state);
255 return;
256
257 case CLEAR_OFFSET:
258 value &= ~1; /* clean up the value */
05b9ec96 259 grlib_irqmp_ack_mask(state, value);
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260 return;
261
262 case MP_STATUS_OFFSET:
263 /* Read Only (no SMP support) */
264 return;
265
266 case BROADCAST_OFFSET:
267 value &= 0xFFFE; /* clean up the value */
268 state->broadcast = value;
269 return;
270
271 default:
272 break;
273 }
274
275 /* mask registers */
276 if (addr >= MASK_OFFSET && addr < FORCE_OFFSET) {
277 int cpu = (addr - MASK_OFFSET) / 4;
278 assert(cpu >= 0 && cpu < IRQMP_MAX_CPU);
279
280 value &= ~1; /* clean up the value */
281 state->mask[cpu] = value;
282 grlib_irqmp_check_irqs(irqmp->state);
283 return;
284 }
285
286 /* force registers */
287 if (addr >= FORCE_OFFSET && addr < EXTENDED_OFFSET) {
288 int cpu = (addr - FORCE_OFFSET) / 4;
289 assert(cpu >= 0 && cpu < IRQMP_MAX_CPU);
290
291 uint32_t force = value & 0xFFFE;
292 uint32_t clear = (value >> 16) & 0xFFFE;
293 uint32_t old = state->force[cpu];
294
295 state->force[cpu] = (old | force) & ~clear;
296 grlib_irqmp_check_irqs(irqmp->state);
297 return;
298 }
299
300 /* extended (not supported) */
301 if (addr >= EXTENDED_OFFSET && addr < IRQMP_REG_SIZE) {
302 int cpu = (addr - EXTENDED_OFFSET) / 4;
303 assert(cpu >= 0 && cpu < IRQMP_MAX_CPU);
304
305 value &= 0xF; /* clean up the value */
306 state->extended[cpu] = value;
307 return;
308 }
309
b4548fcc 310 trace_grlib_irqmp_writel_unknown(addr, value);
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311}
312
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313static const MemoryRegionOps grlib_irqmp_ops = {
314 .read = grlib_irqmp_read,
315 .write = grlib_irqmp_write,
316 .endianness = DEVICE_NATIVE_ENDIAN,
317 .valid = {
318 .min_access_size = 4,
319 .max_access_size = 4,
320 },
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321};
322
323static void grlib_irqmp_reset(DeviceState *d)
324{
730bf932 325 IRQMP *irqmp = GRLIB_IRQMP(d);
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326 assert(irqmp->state != NULL);
327
328 memset(irqmp->state, 0, sizeof *irqmp->state);
329 irqmp->state->parent = irqmp;
330}
331
22c70d8a 332static void grlib_irqmp_init(Object *obj)
3f10bcbb 333{
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334 IRQMP *irqmp = GRLIB_IRQMP(obj);
335 SysBusDevice *dev = SYS_BUS_DEVICE(obj);
3f10bcbb 336
22c70d8a 337 memory_region_init_io(&irqmp->iomem, obj, &grlib_irqmp_ops, irqmp,
847b52c1 338 "irqmp", IRQMP_REG_SIZE);
3f10bcbb 339
7267c094 340 irqmp->state = g_malloc0(sizeof *irqmp->state);
3f10bcbb 341
750ecd44 342 sysbus_init_mmio(dev, &irqmp->iomem);
22c70d8a 343}
3f10bcbb 344
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345static void grlib_irqmp_realize(DeviceState *dev, Error **errp)
346{
347 IRQMP *irqmp = GRLIB_IRQMP(dev);
348
349 /* Check parameters */
350 if (irqmp->set_pil_in == NULL) {
351 error_setg(errp, "set_pil_in cannot be NULL.");
352 }
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353}
354
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AL
355static Property grlib_irqmp_properties[] = {
356 DEFINE_PROP_PTR("set_pil_in", IRQMP, set_pil_in),
357 DEFINE_PROP_PTR("set_pil_in_opaque", IRQMP, set_pil_in_opaque),
358 DEFINE_PROP_END_OF_LIST(),
359};
360
361static void grlib_irqmp_class_init(ObjectClass *klass, void *data)
362{
39bffca2 363 DeviceClass *dc = DEVICE_CLASS(klass);
999e12bb 364
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AL
365 dc->reset = grlib_irqmp_reset;
366 dc->props = grlib_irqmp_properties;
1b111dc1 367 /* Reason: pointer properties "set_pil_in", "set_pil_in_opaque" */
e90f2a8c 368 dc->user_creatable = false;
22c70d8a 369 dc->realize = grlib_irqmp_realize;
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AL
370}
371
8c43a6f0 372static const TypeInfo grlib_irqmp_info = {
730bf932 373 .name = TYPE_GRLIB_IRQMP,
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374 .parent = TYPE_SYS_BUS_DEVICE,
375 .instance_size = sizeof(IRQMP),
22c70d8a 376 .instance_init = grlib_irqmp_init,
39bffca2 377 .class_init = grlib_irqmp_class_init,
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378};
379
83f7d43a 380static void grlib_irqmp_register_types(void)
3f10bcbb 381{
39bffca2 382 type_register_static(&grlib_irqmp_info);
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FC
383}
384
83f7d43a 385type_init(grlib_irqmp_register_types)
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