1 /* 2 * Samsung exynos4210 Interrupt Combiner 3 * 4 * Copyright (c) 2000 - 2011 Samsung Electronics Co., Ltd. 5 * All rights reserved. 6 * 7 * Evgeny Voevodin <e.voevodin@samsung.com> 8 * 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. 13 * 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. 18 * 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/>. 21 */ 22 23 /* 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. 28 */ 29 30 #include "qemu/osdep.h" 31 #include "hw/sysbus.h" 32 #include "migration/vmstate.h" 33 #include "qemu/module.h" 34 #include "hw/intc/exynos4210_combiner.h" 35 #include "hw/arm/exynos4210.h" 36 #include "hw/hw.h" 37 #include "hw/irq.h" 38 #include "hw/qdev-properties.h" 39 #include "qom/object.h" 40 41 //#define DEBUG_COMBINER 42 43 #ifdef DEBUG_COMBINER 44 #define DPRINTF(fmt, ...) \ 45 do { fprintf(stdout, "COMBINER: [%s:%d] " fmt, __func__ , __LINE__, \ 46 ## __VA_ARGS__); } while (0) 47 #else 48 #define DPRINTF(fmt, ...) do {} while (0) 49 #endif 50 51 #define IIC_REGION_SIZE 0x108 /* Size of memory mapped region */ 52 53 static const VMStateDescription vmstate_exynos4210_combiner_group_state = { 54 .name = "exynos4210.combiner.groupstate", 55 .version_id = 1, 56 .minimum_version_id = 1, 57 .fields = (VMStateField[]) { 58 VMSTATE_UINT8(src_mask, CombinerGroupState), 59 VMSTATE_UINT8(src_pending, CombinerGroupState), 60 VMSTATE_END_OF_LIST() 61 } 62 }; 63 64 static const VMStateDescription vmstate_exynos4210_combiner = { 65 .name = "exynos4210.combiner", 66 .version_id = 1, 67 .minimum_version_id = 1, 68 .fields = (VMStateField[]) { 69 VMSTATE_STRUCT_ARRAY(group, Exynos4210CombinerState, IIC_NGRP, 0, 70 vmstate_exynos4210_combiner_group_state, CombinerGroupState), 71 VMSTATE_UINT32_ARRAY(reg_set, Exynos4210CombinerState, 72 IIC_REGSET_SIZE), 73 VMSTATE_UINT32_ARRAY(icipsr, Exynos4210CombinerState, 2), 74 VMSTATE_UINT32(external, Exynos4210CombinerState), 75 VMSTATE_END_OF_LIST() 76 } 77 }; 78 79 static uint64_t 80 exynos4210_combiner_read(void *opaque, hwaddr offset, unsigned size) 81 { 82 struct Exynos4210CombinerState *s = 83 (struct Exynos4210CombinerState *)opaque; 84 uint32_t req_quad_base_n; /* Base of registers quad. Multiply it by 4 and 85 get a start of corresponding group quad */ 86 uint32_t grp_quad_base_n; /* Base of group quad */ 87 uint32_t reg_n; /* Register number inside the quad */ 88 uint32_t val; 89 90 req_quad_base_n = offset >> 4; 91 grp_quad_base_n = req_quad_base_n << 2; 92 reg_n = (offset - (req_quad_base_n << 4)) >> 2; 93 94 if (req_quad_base_n >= IIC_NGRP) { 95 /* Read of ICIPSR register */ 96 return s->icipsr[reg_n]; 97 } 98 99 val = 0; 100 101 switch (reg_n) { 102 /* IISTR */ 103 case 2: 104 val |= s->group[grp_quad_base_n].src_pending; 105 val |= s->group[grp_quad_base_n + 1].src_pending << 8; 106 val |= s->group[grp_quad_base_n + 2].src_pending << 16; 107 val |= s->group[grp_quad_base_n + 3].src_pending << 24; 108 break; 109 /* IIMSR */ 110 case 3: 111 val |= s->group[grp_quad_base_n].src_mask & 112 s->group[grp_quad_base_n].src_pending; 113 val |= (s->group[grp_quad_base_n + 1].src_mask & 114 s->group[grp_quad_base_n + 1].src_pending) << 8; 115 val |= (s->group[grp_quad_base_n + 2].src_mask & 116 s->group[grp_quad_base_n + 2].src_pending) << 16; 117 val |= (s->group[grp_quad_base_n + 3].src_mask & 118 s->group[grp_quad_base_n + 3].src_pending) << 24; 119 break; 120 default: 121 if (offset >> 2 >= IIC_REGSET_SIZE) { 122 hw_error("exynos4210.combiner: overflow of reg_set by 0x" 123 TARGET_FMT_plx "offset\n", offset); 124 } 125 val = s->reg_set[offset >> 2]; 126 } 127 return val; 128 } 129 130 static void exynos4210_combiner_update(void *opaque, uint8_t group_n) 131 { 132 struct Exynos4210CombinerState *s = 133 (struct Exynos4210CombinerState *)opaque; 134 135 /* Send interrupt if needed */ 136 if (s->group[group_n].src_mask & s->group[group_n].src_pending) { 137 #ifdef DEBUG_COMBINER 138 if (group_n != 26) { 139 /* skip uart */ 140 DPRINTF("%s raise IRQ[%d]\n", s->external ? "EXT" : "INT", group_n); 141 } 142 #endif 143 144 /* Set Combiner interrupt pending status after masking */ 145 if (group_n >= 32) { 146 s->icipsr[1] |= 1 << (group_n - 32); 147 } else { 148 s->icipsr[0] |= 1 << group_n; 149 } 150 151 qemu_irq_raise(s->output_irq[group_n]); 152 } else { 153 #ifdef DEBUG_COMBINER 154 if (group_n != 26) { 155 /* skip uart */ 156 DPRINTF("%s lower IRQ[%d]\n", s->external ? "EXT" : "INT", group_n); 157 } 158 #endif 159 160 /* Set Combiner interrupt pending status after masking */ 161 if (group_n >= 32) { 162 s->icipsr[1] &= ~(1 << (group_n - 32)); 163 } else { 164 s->icipsr[0] &= ~(1 << group_n); 165 } 166 167 qemu_irq_lower(s->output_irq[group_n]); 168 } 169 } 170 171 static void exynos4210_combiner_write(void *opaque, hwaddr offset, 172 uint64_t val, unsigned size) 173 { 174 struct Exynos4210CombinerState *s = 175 (struct Exynos4210CombinerState *)opaque; 176 uint32_t req_quad_base_n; /* Base of registers quad. Multiply it by 4 and 177 get a start of corresponding group quad */ 178 uint32_t grp_quad_base_n; /* Base of group quad */ 179 uint32_t reg_n; /* Register number inside the quad */ 180 181 req_quad_base_n = offset >> 4; 182 grp_quad_base_n = req_quad_base_n << 2; 183 reg_n = (offset - (req_quad_base_n << 4)) >> 2; 184 185 if (req_quad_base_n >= IIC_NGRP) { 186 hw_error("exynos4210.combiner: unallowed write access at offset 0x" 187 TARGET_FMT_plx "\n", offset); 188 return; 189 } 190 191 if (reg_n > 1) { 192 hw_error("exynos4210.combiner: unallowed write access at offset 0x" 193 TARGET_FMT_plx "\n", offset); 194 return; 195 } 196 197 if (offset >> 2 >= IIC_REGSET_SIZE) { 198 hw_error("exynos4210.combiner: overflow of reg_set by 0x" 199 TARGET_FMT_plx "offset\n", offset); 200 } 201 s->reg_set[offset >> 2] = val; 202 203 switch (reg_n) { 204 /* IIESR */ 205 case 0: 206 /* FIXME: what if irq is pending, allowed by mask, and we allow it 207 * again. Interrupt will rise again! */ 208 209 DPRINTF("%s enable IRQ for groups %d, %d, %d, %d\n", 210 s->external ? "EXT" : "INT", 211 grp_quad_base_n, 212 grp_quad_base_n + 1, 213 grp_quad_base_n + 2, 214 grp_quad_base_n + 3); 215 216 /* Enable interrupt sources */ 217 s->group[grp_quad_base_n].src_mask |= val & 0xFF; 218 s->group[grp_quad_base_n + 1].src_mask |= (val & 0xFF00) >> 8; 219 s->group[grp_quad_base_n + 2].src_mask |= (val & 0xFF0000) >> 16; 220 s->group[grp_quad_base_n + 3].src_mask |= (val & 0xFF000000) >> 24; 221 222 exynos4210_combiner_update(s, grp_quad_base_n); 223 exynos4210_combiner_update(s, grp_quad_base_n + 1); 224 exynos4210_combiner_update(s, grp_quad_base_n + 2); 225 exynos4210_combiner_update(s, grp_quad_base_n + 3); 226 break; 227 /* IIECR */ 228 case 1: 229 DPRINTF("%s disable IRQ for groups %d, %d, %d, %d\n", 230 s->external ? "EXT" : "INT", 231 grp_quad_base_n, 232 grp_quad_base_n + 1, 233 grp_quad_base_n + 2, 234 grp_quad_base_n + 3); 235 236 /* Disable interrupt sources */ 237 s->group[grp_quad_base_n].src_mask &= ~(val & 0xFF); 238 s->group[grp_quad_base_n + 1].src_mask &= ~((val & 0xFF00) >> 8); 239 s->group[grp_quad_base_n + 2].src_mask &= ~((val & 0xFF0000) >> 16); 240 s->group[grp_quad_base_n + 3].src_mask &= ~((val & 0xFF000000) >> 24); 241 242 exynos4210_combiner_update(s, grp_quad_base_n); 243 exynos4210_combiner_update(s, grp_quad_base_n + 1); 244 exynos4210_combiner_update(s, grp_quad_base_n + 2); 245 exynos4210_combiner_update(s, grp_quad_base_n + 3); 246 break; 247 default: 248 hw_error("exynos4210.combiner: unallowed write access at offset 0x" 249 TARGET_FMT_plx "\n", offset); 250 break; 251 } 252 } 253 254 /* Get combiner group and bit from irq number */ 255 static uint8_t get_combiner_group_and_bit(int irq, uint8_t *bit) 256 { 257 *bit = irq - ((irq >> 3) << 3); 258 return irq >> 3; 259 } 260 261 /* Process a change in an external IRQ input. */ 262 static void exynos4210_combiner_handler(void *opaque, int irq, int level) 263 { 264 struct Exynos4210CombinerState *s = 265 (struct Exynos4210CombinerState *)opaque; 266 uint8_t bit_n, group_n; 267 268 group_n = get_combiner_group_and_bit(irq, &bit_n); 269 270 if (s->external && group_n >= EXYNOS4210_MAX_EXT_COMBINER_OUT_IRQ) { 271 DPRINTF("%s unallowed IRQ group 0x%x\n", s->external ? "EXT" : "INT" 272 , group_n); 273 return; 274 } 275 276 if (level) { 277 s->group[group_n].src_pending |= 1 << bit_n; 278 } else { 279 s->group[group_n].src_pending &= ~(1 << bit_n); 280 } 281 282 exynos4210_combiner_update(s, group_n); 283 } 284 285 static void exynos4210_combiner_reset(DeviceState *d) 286 { 287 struct Exynos4210CombinerState *s = (struct Exynos4210CombinerState *)d; 288 289 memset(&s->group, 0, sizeof(s->group)); 290 memset(&s->reg_set, 0, sizeof(s->reg_set)); 291 292 s->reg_set[0xC0 >> 2] = 0x01010101; 293 s->reg_set[0xC4 >> 2] = 0x01010101; 294 s->reg_set[0xD0 >> 2] = 0x01010101; 295 s->reg_set[0xD4 >> 2] = 0x01010101; 296 } 297 298 static const MemoryRegionOps exynos4210_combiner_ops = { 299 .read = exynos4210_combiner_read, 300 .write = exynos4210_combiner_write, 301 .endianness = DEVICE_NATIVE_ENDIAN, 302 }; 303 304 /* 305 * Internal Combiner initialization. 306 */ 307 static void exynos4210_combiner_init(Object *obj) 308 { 309 DeviceState *dev = DEVICE(obj); 310 Exynos4210CombinerState *s = EXYNOS4210_COMBINER(obj); 311 SysBusDevice *sbd = SYS_BUS_DEVICE(obj); 312 unsigned int i; 313 314 /* Allocate general purpose input signals and connect a handler to each of 315 * them */ 316 qdev_init_gpio_in(dev, exynos4210_combiner_handler, IIC_NIRQ); 317 318 /* Connect SysBusDev irqs to device specific irqs */ 319 for (i = 0; i < IIC_NGRP; i++) { 320 sysbus_init_irq(sbd, &s->output_irq[i]); 321 } 322 323 memory_region_init_io(&s->iomem, obj, &exynos4210_combiner_ops, s, 324 "exynos4210-combiner", IIC_REGION_SIZE); 325 sysbus_init_mmio(sbd, &s->iomem); 326 } 327 328 static Property exynos4210_combiner_properties[] = { 329 DEFINE_PROP_UINT32("external", Exynos4210CombinerState, external, 0), 330 DEFINE_PROP_END_OF_LIST(), 331 }; 332 333 static void exynos4210_combiner_class_init(ObjectClass *klass, void *data) 334 { 335 DeviceClass *dc = DEVICE_CLASS(klass); 336 337 dc->reset = exynos4210_combiner_reset; 338 device_class_set_props(dc, exynos4210_combiner_properties); 339 dc->vmsd = &vmstate_exynos4210_combiner; 340 } 341 342 static const TypeInfo exynos4210_combiner_info = { 343 .name = TYPE_EXYNOS4210_COMBINER, 344 .parent = TYPE_SYS_BUS_DEVICE, 345 .instance_size = sizeof(Exynos4210CombinerState), 346 .instance_init = exynos4210_combiner_init, 347 .class_init = exynos4210_combiner_class_init, 348 }; 349 350 static void exynos4210_combiner_register_types(void) 351 { 352 type_register_static(&exynos4210_combiner_info); 353 } 354 355 type_init(exynos4210_combiner_register_types) 356