2 * Samsung exynos4210 Interrupt Combiner
4 * Copyright (c) 2000 - 2011 Samsung Electronics Co., Ltd.
9 * This program is free software; you can redistribute it and/or modify it
10 * under the terms of the GNU General Public License as published by the
11 * Free Software Foundation; either version 2 of the License, or (at your
12 * option) any later version.
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.
17 * See the GNU General Public License for more details.
19 * You should have received a copy of the GNU General Public License along
20 * with this program; if not, see <http://www.gnu.org/licenses/>.
24 * Exynos4210 Combiner represents an OR gate for SOC's IRQ lines. It combines
25 * IRQ sources into groups and provides signal output to GIC from each group. It
26 * is driven by common mask and enable/disable logic. Take a note that not all
27 * IRQs are passed to GIC through Combiner.
30 #include "hw/sysbus.h"
32 #include "hw/arm/exynos4210.h"
34 //#define DEBUG_COMBINER
37 #define DPRINTF(fmt, ...) \
38 do { fprintf(stdout, "COMBINER: [%s:%d] " fmt, __func__ , __LINE__, \
39 ## __VA_ARGS__); } while (0)
41 #define DPRINTF(fmt, ...) do {} while (0)
44 #define IIC_NGRP 64 /* Internal Interrupt Combiner
46 #define IIC_NIRQ (IIC_NGRP * 8)/* Internal Interrupt Combiner
48 #define IIC_REGION_SIZE 0x108 /* Size of memory mapped region */
49 #define IIC_REGSET_SIZE 0x41
52 * State for each output signal of internal combiner
54 typedef struct CombinerGroupState {
55 uint8_t src_mask; /* 1 - source enabled, 0 - disabled */
56 uint8_t src_pending; /* Pending source interrupts before masking */
59 typedef struct Exynos4210CombinerState {
63 struct CombinerGroupState group[IIC_NGRP];
64 uint32_t reg_set[IIC_REGSET_SIZE];
66 uint32_t external; /* 1 means that this combiner is external */
68 qemu_irq output_irq[IIC_NGRP];
69 } Exynos4210CombinerState;
71 static const VMStateDescription vmstate_exynos4210_combiner_group_state = {
72 .name = "exynos4210.combiner.groupstate",
74 .minimum_version_id = 1,
75 .minimum_version_id_old = 1,
76 .fields = (VMStateField[]) {
77 VMSTATE_UINT8(src_mask, CombinerGroupState),
78 VMSTATE_UINT8(src_pending, CombinerGroupState),
83 static const VMStateDescription vmstate_exynos4210_combiner = {
84 .name = "exynos4210.combiner",
86 .minimum_version_id = 1,
87 .minimum_version_id_old = 1,
88 .fields = (VMStateField[]) {
89 VMSTATE_STRUCT_ARRAY(group, Exynos4210CombinerState, IIC_NGRP, 0,
90 vmstate_exynos4210_combiner_group_state, CombinerGroupState),
91 VMSTATE_UINT32_ARRAY(reg_set, Exynos4210CombinerState,
93 VMSTATE_UINT32_ARRAY(icipsr, Exynos4210CombinerState, 2),
94 VMSTATE_UINT32(external, Exynos4210CombinerState),
100 * Get Combiner input GPIO into irqs structure
102 void exynos4210_combiner_get_gpioin(Exynos4210Irq *irqs, DeviceState *dev,
110 max = ext ? EXYNOS4210_MAX_EXT_COMBINER_IN_IRQ :
111 EXYNOS4210_MAX_INT_COMBINER_IN_IRQ;
112 irq = ext ? irqs->ext_combiner_irq : irqs->int_combiner_irq;
115 * Some IRQs of Int/External Combiner are going to two Combiners groups,
118 for (n = 0; n < max; n++) {
120 bit = EXYNOS4210_COMBINER_GET_BIT_NUM(n);
123 /* MDNIE_LCD1 INTG1 */
124 case EXYNOS4210_COMBINER_GET_IRQ_NUM(1, 0) ...
125 EXYNOS4210_COMBINER_GET_IRQ_NUM(1, 3):
126 irq[n] = qemu_irq_split(qdev_get_gpio_in(dev, n),
127 irq[EXYNOS4210_COMBINER_GET_IRQ_NUM(0, bit + 4)]);
131 case EXYNOS4210_COMBINER_GET_IRQ_NUM(3, 4):
132 irq[n] = qemu_irq_split(qdev_get_gpio_in(dev, n),
133 irq[EXYNOS4210_COMBINER_GET_IRQ_NUM(2, bit)]);
137 case EXYNOS4210_COMBINER_GET_IRQ_NUM(12, 0) ...
138 EXYNOS4210_COMBINER_GET_IRQ_NUM(12, 3):
139 irq[n] = qemu_irq_split(qdev_get_gpio_in(dev, n),
140 irq[EXYNOS4210_COMBINER_GET_IRQ_NUM(11, bit + 4)]);
143 /* Multi-Core Timer INTG12 */
144 case EXYNOS4210_COMBINER_GET_IRQ_NUM(12, 4) ...
145 EXYNOS4210_COMBINER_GET_IRQ_NUM(12, 8):
146 irq[n] = qemu_irq_split(qdev_get_gpio_in(dev, n),
147 irq[EXYNOS4210_COMBINER_GET_IRQ_NUM(1, bit + 4)]);
150 /* Multi-Core Timer INTG35 */
151 case EXYNOS4210_COMBINER_GET_IRQ_NUM(35, 4) ...
152 EXYNOS4210_COMBINER_GET_IRQ_NUM(35, 8):
153 irq[n] = qemu_irq_split(qdev_get_gpio_in(dev, n),
154 irq[EXYNOS4210_COMBINER_GET_IRQ_NUM(1, bit + 4)]);
157 /* Multi-Core Timer INTG51 */
158 case EXYNOS4210_COMBINER_GET_IRQ_NUM(51, 4) ...
159 EXYNOS4210_COMBINER_GET_IRQ_NUM(51, 8):
160 irq[n] = qemu_irq_split(qdev_get_gpio_in(dev, n),
161 irq[EXYNOS4210_COMBINER_GET_IRQ_NUM(1, bit + 4)]);
164 /* Multi-Core Timer INTG53 */
165 case EXYNOS4210_COMBINER_GET_IRQ_NUM(53, 4) ...
166 EXYNOS4210_COMBINER_GET_IRQ_NUM(53, 8):
167 irq[n] = qemu_irq_split(qdev_get_gpio_in(dev, n),
168 irq[EXYNOS4210_COMBINER_GET_IRQ_NUM(1, bit + 4)]);
172 irq[n] = qdev_get_gpio_in(dev, n);
177 exynos4210_combiner_read(void *opaque, hwaddr offset, unsigned size)
179 struct Exynos4210CombinerState *s =
180 (struct Exynos4210CombinerState *)opaque;
181 uint32_t req_quad_base_n; /* Base of registers quad. Multiply it by 4 and
182 get a start of corresponding group quad */
183 uint32_t grp_quad_base_n; /* Base of group quad */
184 uint32_t reg_n; /* Register number inside the quad */
187 req_quad_base_n = offset >> 4;
188 grp_quad_base_n = req_quad_base_n << 2;
189 reg_n = (offset - (req_quad_base_n << 4)) >> 2;
191 if (req_quad_base_n >= IIC_NGRP) {
192 /* Read of ICIPSR register */
193 return s->icipsr[reg_n];
201 val |= s->group[grp_quad_base_n].src_pending;
202 val |= s->group[grp_quad_base_n + 1].src_pending << 8;
203 val |= s->group[grp_quad_base_n + 2].src_pending << 16;
204 val |= s->group[grp_quad_base_n + 3].src_pending << 24;
208 val |= s->group[grp_quad_base_n].src_mask &
209 s->group[grp_quad_base_n].src_pending;
210 val |= (s->group[grp_quad_base_n + 1].src_mask &
211 s->group[grp_quad_base_n + 1].src_pending) << 8;
212 val |= (s->group[grp_quad_base_n + 2].src_mask &
213 s->group[grp_quad_base_n + 2].src_pending) << 16;
214 val |= (s->group[grp_quad_base_n + 3].src_mask &
215 s->group[grp_quad_base_n + 3].src_pending) << 24;
218 if (offset >> 2 >= IIC_REGSET_SIZE) {
219 hw_error("exynos4210.combiner: overflow of reg_set by 0x"
220 TARGET_FMT_plx "offset\n", offset);
222 val = s->reg_set[offset >> 2];
228 static void exynos4210_combiner_update(void *opaque, uint8_t group_n)
230 struct Exynos4210CombinerState *s =
231 (struct Exynos4210CombinerState *)opaque;
233 /* Send interrupt if needed */
234 if (s->group[group_n].src_mask & s->group[group_n].src_pending) {
235 #ifdef DEBUG_COMBINER
238 DPRINTF("%s raise IRQ[%d]\n", s->external ? "EXT" : "INT", group_n);
242 /* Set Combiner interrupt pending status after masking */
244 s->icipsr[1] |= 1 << (group_n - 32);
246 s->icipsr[0] |= 1 << group_n;
249 qemu_irq_raise(s->output_irq[group_n]);
251 #ifdef DEBUG_COMBINER
254 DPRINTF("%s lower IRQ[%d]\n", s->external ? "EXT" : "INT", group_n);
258 /* Set Combiner interrupt pending status after masking */
260 s->icipsr[1] &= ~(1 << (group_n - 32));
262 s->icipsr[0] &= ~(1 << group_n);
265 qemu_irq_lower(s->output_irq[group_n]);
269 static void exynos4210_combiner_write(void *opaque, hwaddr offset,
270 uint64_t val, unsigned size)
272 struct Exynos4210CombinerState *s =
273 (struct Exynos4210CombinerState *)opaque;
274 uint32_t req_quad_base_n; /* Base of registers quad. Multiply it by 4 and
275 get a start of corresponding group quad */
276 uint32_t grp_quad_base_n; /* Base of group quad */
277 uint32_t reg_n; /* Register number inside the quad */
279 req_quad_base_n = offset >> 4;
280 grp_quad_base_n = req_quad_base_n << 2;
281 reg_n = (offset - (req_quad_base_n << 4)) >> 2;
283 if (req_quad_base_n >= IIC_NGRP) {
284 hw_error("exynos4210.combiner: unallowed write access at offset 0x"
285 TARGET_FMT_plx "\n", offset);
290 hw_error("exynos4210.combiner: unallowed write access at offset 0x"
291 TARGET_FMT_plx "\n", offset);
295 if (offset >> 2 >= IIC_REGSET_SIZE) {
296 hw_error("exynos4210.combiner: overflow of reg_set by 0x"
297 TARGET_FMT_plx "offset\n", offset);
299 s->reg_set[offset >> 2] = val;
304 /* FIXME: what if irq is pending, allowed by mask, and we allow it
305 * again. Interrupt will rise again! */
307 DPRINTF("%s enable IRQ for groups %d, %d, %d, %d\n",
308 s->external ? "EXT" : "INT",
312 grp_quad_base_n + 3);
314 /* Enable interrupt sources */
315 s->group[grp_quad_base_n].src_mask |= val & 0xFF;
316 s->group[grp_quad_base_n + 1].src_mask |= (val & 0xFF00) >> 8;
317 s->group[grp_quad_base_n + 2].src_mask |= (val & 0xFF0000) >> 16;
318 s->group[grp_quad_base_n + 3].src_mask |= (val & 0xFF000000) >> 24;
320 exynos4210_combiner_update(s, grp_quad_base_n);
321 exynos4210_combiner_update(s, grp_quad_base_n + 1);
322 exynos4210_combiner_update(s, grp_quad_base_n + 2);
323 exynos4210_combiner_update(s, grp_quad_base_n + 3);
327 DPRINTF("%s disable IRQ for groups %d, %d, %d, %d\n",
328 s->external ? "EXT" : "INT",
332 grp_quad_base_n + 3);
334 /* Disable interrupt sources */
335 s->group[grp_quad_base_n].src_mask &= ~(val & 0xFF);
336 s->group[grp_quad_base_n + 1].src_mask &= ~((val & 0xFF00) >> 8);
337 s->group[grp_quad_base_n + 2].src_mask &= ~((val & 0xFF0000) >> 16);
338 s->group[grp_quad_base_n + 3].src_mask &= ~((val & 0xFF000000) >> 24);
340 exynos4210_combiner_update(s, grp_quad_base_n);
341 exynos4210_combiner_update(s, grp_quad_base_n + 1);
342 exynos4210_combiner_update(s, grp_quad_base_n + 2);
343 exynos4210_combiner_update(s, grp_quad_base_n + 3);
346 hw_error("exynos4210.combiner: unallowed write access at offset 0x"
347 TARGET_FMT_plx "\n", offset);
352 /* Get combiner group and bit from irq number */
353 static uint8_t get_combiner_group_and_bit(int irq, uint8_t *bit)
355 *bit = irq - ((irq >> 3) << 3);
359 /* Process a change in an external IRQ input. */
360 static void exynos4210_combiner_handler(void *opaque, int irq, int level)
362 struct Exynos4210CombinerState *s =
363 (struct Exynos4210CombinerState *)opaque;
364 uint8_t bit_n, group_n;
366 group_n = get_combiner_group_and_bit(irq, &bit_n);
368 if (s->external && group_n >= EXYNOS4210_MAX_EXT_COMBINER_OUT_IRQ) {
369 DPRINTF("%s unallowed IRQ group 0x%x\n", s->external ? "EXT" : "INT"
375 s->group[group_n].src_pending |= 1 << bit_n;
377 s->group[group_n].src_pending &= ~(1 << bit_n);
380 exynos4210_combiner_update(s, group_n);
383 static void exynos4210_combiner_reset(DeviceState *d)
385 struct Exynos4210CombinerState *s = (struct Exynos4210CombinerState *)d;
387 memset(&s->group, 0, sizeof(s->group));
388 memset(&s->reg_set, 0, sizeof(s->reg_set));
390 s->reg_set[0xC0 >> 2] = 0x01010101;
391 s->reg_set[0xC4 >> 2] = 0x01010101;
392 s->reg_set[0xD0 >> 2] = 0x01010101;
393 s->reg_set[0xD4 >> 2] = 0x01010101;
396 static const MemoryRegionOps exynos4210_combiner_ops = {
397 .read = exynos4210_combiner_read,
398 .write = exynos4210_combiner_write,
399 .endianness = DEVICE_NATIVE_ENDIAN,
403 * Internal Combiner initialization.
405 static int exynos4210_combiner_init(SysBusDevice *dev)
408 struct Exynos4210CombinerState *s =
409 FROM_SYSBUS(struct Exynos4210CombinerState, dev);
411 /* Allocate general purpose input signals and connect a handler to each of
413 qdev_init_gpio_in(&s->busdev.qdev, exynos4210_combiner_handler, IIC_NIRQ);
415 /* Connect SysBusDev irqs to device specific irqs */
416 for (i = 0; i < IIC_NIRQ; i++) {
417 sysbus_init_irq(dev, &s->output_irq[i]);
420 memory_region_init_io(&s->iomem, &exynos4210_combiner_ops, s,
421 "exynos4210-combiner", IIC_REGION_SIZE);
422 sysbus_init_mmio(dev, &s->iomem);
427 static Property exynos4210_combiner_properties[] = {
428 DEFINE_PROP_UINT32("external", Exynos4210CombinerState, external, 0),
429 DEFINE_PROP_END_OF_LIST(),
432 static void exynos4210_combiner_class_init(ObjectClass *klass, void *data)
434 DeviceClass *dc = DEVICE_CLASS(klass);
435 SysBusDeviceClass *k = SYS_BUS_DEVICE_CLASS(klass);
437 k->init = exynos4210_combiner_init;
438 dc->reset = exynos4210_combiner_reset;
439 dc->props = exynos4210_combiner_properties;
440 dc->vmsd = &vmstate_exynos4210_combiner;
443 static const TypeInfo exynos4210_combiner_info = {
444 .name = "exynos4210.combiner",
445 .parent = TYPE_SYS_BUS_DEVICE,
446 .instance_size = sizeof(Exynos4210CombinerState),
447 .class_init = exynos4210_combiner_class_init,
450 static void exynos4210_combiner_register_types(void)
452 type_register_static(&exynos4210_combiner_info);
455 type_init(exynos4210_combiner_register_types)