hw/intc/exynos4210_combiner.c

   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 "hw/sysbus.h"
  31
  32 #include "hw/arm/exynos4210.h"
  33
  34 //#define DEBUG_COMBINER
  35
  36 #ifdef DEBUG_COMBINER
  37 #define DPRINTF(fmt, ...) \
  38         do { fprintf(stdout, "COMBINER: [%s:%d] " fmt, __func__ , __LINE__, \
  39                 ## __VA_ARGS__); } while (0)
  40 #else
  41 #define DPRINTF(fmt, ...) do {} while (0)
  42 #endif
  43
  44 #define    IIC_NGRP        64            /* Internal Interrupt Combiner
  45                                             Groups number */
  46 #define    IIC_NIRQ        (IIC_NGRP * 8)/* Internal Interrupt Combiner
  47                                             Interrupts number */
  48 #define IIC_REGION_SIZE    0x108         /* Size of memory mapped region */
  49 #define IIC_REGSET_SIZE    0x41
  50
  51 /*
  52  * State for each output signal of internal combiner
  53  */
  54 typedef struct CombinerGroupState {
  55     uint8_t src_mask;            /* 1 - source enabled, 0 - disabled */
  56     uint8_t src_pending;        /* Pending source interrupts before masking */
  57 } CombinerGroupState;
  58
  59 #define TYPE_EXYNOS4210_COMBINER "exynos4210.combiner"
  60 #define EXYNOS4210_COMBINER(obj) \
  61     OBJECT_CHECK(Exynos4210CombinerState, (obj), TYPE_EXYNOS4210_COMBINER)
  62
  63 typedef struct Exynos4210CombinerState {
  64     SysBusDevice parent_obj;
  65
  66     MemoryRegion iomem;
  67
  68     struct CombinerGroupState group[IIC_NGRP];
  69     uint32_t reg_set[IIC_REGSET_SIZE];
  70     uint32_t icipsr[2];
  71     uint32_t external;          /* 1 means that this combiner is external */
  72
  73     qemu_irq output_irq[IIC_NGRP];
  74 } Exynos4210CombinerState;
  75
  76 static const VMStateDescription vmstate_exynos4210_combiner_group_state = {
  77     .name = "exynos4210.combiner.groupstate",
  78     .version_id = 1,
  79     .minimum_version_id = 1,
  80     .minimum_version_id_old = 1,
  81     .fields = (VMStateField[]) {
  82         VMSTATE_UINT8(src_mask, CombinerGroupState),
  83         VMSTATE_UINT8(src_pending, CombinerGroupState),
  84         VMSTATE_END_OF_LIST()
  85     }
  86 };
  87
  88 static const VMStateDescription vmstate_exynos4210_combiner = {
  89     .name = "exynos4210.combiner",
  90     .version_id = 1,
  91     .minimum_version_id = 1,
  92     .minimum_version_id_old = 1,
  93     .fields = (VMStateField[]) {
  94         VMSTATE_STRUCT_ARRAY(group, Exynos4210CombinerState, IIC_NGRP, 0,
  95                 vmstate_exynos4210_combiner_group_state, CombinerGroupState),
  96         VMSTATE_UINT32_ARRAY(reg_set, Exynos4210CombinerState,
  97                 IIC_REGSET_SIZE),
  98         VMSTATE_UINT32_ARRAY(icipsr, Exynos4210CombinerState, 2),
  99         VMSTATE_UINT32(external, Exynos4210CombinerState),
 100         VMSTATE_END_OF_LIST()
 101     }
 102 };
 103
 104 /*
 105  * Get Combiner input GPIO into irqs structure
 106  */
 107 void exynos4210_combiner_get_gpioin(Exynos4210Irq *irqs, DeviceState *dev,
 108         int ext)
 109 {
 110     int n;
 111     int bit;
 112     int max;
 113     qemu_irq *irq;
 114
 115     max = ext ? EXYNOS4210_MAX_EXT_COMBINER_IN_IRQ :
 116         EXYNOS4210_MAX_INT_COMBINER_IN_IRQ;
 117     irq = ext ? irqs->ext_combiner_irq : irqs->int_combiner_irq;
 118
 119     /*
 120      * Some IRQs of Int/External Combiner are going to two Combiners groups,
 121      * so let split them.
 122      */
 123     for (n = 0; n < max; n++) {
 124
 125         bit = EXYNOS4210_COMBINER_GET_BIT_NUM(n);
 126
 127         switch (n) {
 128         /* MDNIE_LCD1 INTG1 */
 129         case EXYNOS4210_COMBINER_GET_IRQ_NUM(1, 0) ...
 130              EXYNOS4210_COMBINER_GET_IRQ_NUM(1, 3):
 131             irq[n] = qemu_irq_split(qdev_get_gpio_in(dev, n),
 132                     irq[EXYNOS4210_COMBINER_GET_IRQ_NUM(0, bit + 4)]);
 133             continue;
 134
 135         /* TMU INTG3 */
 136         case EXYNOS4210_COMBINER_GET_IRQ_NUM(3, 4):
 137             irq[n] = qemu_irq_split(qdev_get_gpio_in(dev, n),
 138                     irq[EXYNOS4210_COMBINER_GET_IRQ_NUM(2, bit)]);
 139             continue;
 140
 141         /* LCD1 INTG12 */
 142         case EXYNOS4210_COMBINER_GET_IRQ_NUM(12, 0) ...
 143              EXYNOS4210_COMBINER_GET_IRQ_NUM(12, 3):
 144             irq[n] = qemu_irq_split(qdev_get_gpio_in(dev, n),
 145                     irq[EXYNOS4210_COMBINER_GET_IRQ_NUM(11, bit + 4)]);
 146             continue;
 147
 148         /* Multi-Core Timer INTG12 */
 149         case EXYNOS4210_COMBINER_GET_IRQ_NUM(12, 4) ...
 150              EXYNOS4210_COMBINER_GET_IRQ_NUM(12, 8):
 151                irq[n] = qemu_irq_split(qdev_get_gpio_in(dev, n),
 152                        irq[EXYNOS4210_COMBINER_GET_IRQ_NUM(1, bit + 4)]);
 153             continue;
 154
 155         /* Multi-Core Timer INTG35 */
 156         case EXYNOS4210_COMBINER_GET_IRQ_NUM(35, 4) ...
 157              EXYNOS4210_COMBINER_GET_IRQ_NUM(35, 8):
 158             irq[n] = qemu_irq_split(qdev_get_gpio_in(dev, n),
 159                     irq[EXYNOS4210_COMBINER_GET_IRQ_NUM(1, bit + 4)]);
 160             continue;
 161
 162         /* Multi-Core Timer INTG51 */
 163         case EXYNOS4210_COMBINER_GET_IRQ_NUM(51, 4) ...
 164              EXYNOS4210_COMBINER_GET_IRQ_NUM(51, 8):
 165             irq[n] = qemu_irq_split(qdev_get_gpio_in(dev, n),
 166                     irq[EXYNOS4210_COMBINER_GET_IRQ_NUM(1, bit + 4)]);
 167             continue;
 168
 169         /* Multi-Core Timer INTG53 */
 170         case EXYNOS4210_COMBINER_GET_IRQ_NUM(53, 4) ...
 171              EXYNOS4210_COMBINER_GET_IRQ_NUM(53, 8):
 172             irq[n] = qemu_irq_split(qdev_get_gpio_in(dev, n),
 173                     irq[EXYNOS4210_COMBINER_GET_IRQ_NUM(1, bit + 4)]);
 174             continue;
 175         }
 176
 177         irq[n] = qdev_get_gpio_in(dev, n);
 178     }
 179 }
 180
 181 static uint64_t
 182 exynos4210_combiner_read(void *opaque, hwaddr offset, unsigned size)
 183 {
 184     struct Exynos4210CombinerState *s =
 185             (struct Exynos4210CombinerState *)opaque;
 186     uint32_t req_quad_base_n;    /* Base of registers quad. Multiply it by 4 and
 187                                    get a start of corresponding group quad */
 188     uint32_t grp_quad_base_n;    /* Base of group quad */
 189     uint32_t reg_n;              /* Register number inside the quad */
 190     uint32_t val;
 191
 192     req_quad_base_n = offset >> 4;
 193     grp_quad_base_n = req_quad_base_n << 2;
 194     reg_n = (offset - (req_quad_base_n << 4)) >> 2;
 195
 196     if (req_quad_base_n >= IIC_NGRP) {
 197         /* Read of ICIPSR register */
 198         return s->icipsr[reg_n];
 199     }
 200
 201     val = 0;
 202
 203     switch (reg_n) {
 204     /* IISTR */
 205     case 2:
 206         val |= s->group[grp_quad_base_n].src_pending;
 207         val |= s->group[grp_quad_base_n + 1].src_pending << 8;
 208         val |= s->group[grp_quad_base_n + 2].src_pending << 16;
 209         val |= s->group[grp_quad_base_n + 3].src_pending << 24;
 210         break;
 211     /* IIMSR */
 212     case 3:
 213         val |= s->group[grp_quad_base_n].src_mask &
 214         s->group[grp_quad_base_n].src_pending;
 215         val |= (s->group[grp_quad_base_n + 1].src_mask &
 216                 s->group[grp_quad_base_n + 1].src_pending) << 8;
 217         val |= (s->group[grp_quad_base_n + 2].src_mask &
 218                 s->group[grp_quad_base_n + 2].src_pending) << 16;
 219         val |= (s->group[grp_quad_base_n + 3].src_mask &
 220                 s->group[grp_quad_base_n + 3].src_pending) << 24;
 221         break;
 222     default:
 223         if (offset >> 2 >= IIC_REGSET_SIZE) {
 224             hw_error("exynos4210.combiner: overflow of reg_set by 0x"
 225                     TARGET_FMT_plx "offset\n", offset);
 226         }
 227         val = s->reg_set[offset >> 2];
 228         return 0;
 229     }
 230     return val;
 231 }
 232
 233 static void exynos4210_combiner_update(void *opaque, uint8_t group_n)
 234 {
 235     struct Exynos4210CombinerState *s =
 236             (struct Exynos4210CombinerState *)opaque;
 237
 238     /* Send interrupt if needed */
 239     if (s->group[group_n].src_mask & s->group[group_n].src_pending) {
 240 #ifdef DEBUG_COMBINER
 241         if (group_n != 26) {
 242             /* skip uart */
 243             DPRINTF("%s raise IRQ[%d]\n", s->external ? "EXT" : "INT", group_n);
 244         }
 245 #endif
 246
 247         /* Set Combiner interrupt pending status after masking */
 248         if (group_n >= 32) {
 249             s->icipsr[1] |= 1 << (group_n - 32);
 250         } else {
 251             s->icipsr[0] |= 1 << group_n;
 252         }
 253
 254         qemu_irq_raise(s->output_irq[group_n]);
 255     } else {
 256 #ifdef DEBUG_COMBINER
 257         if (group_n != 26) {
 258             /* skip uart */
 259             DPRINTF("%s lower IRQ[%d]\n", s->external ? "EXT" : "INT", group_n);
 260         }
 261 #endif
 262
 263         /* Set Combiner interrupt pending status after masking */
 264         if (group_n >= 32) {
 265             s->icipsr[1] &= ~(1 << (group_n - 32));
 266         } else {
 267             s->icipsr[0] &= ~(1 << group_n);
 268         }
 269
 270         qemu_irq_lower(s->output_irq[group_n]);
 271     }
 272 }
 273
 274 static void exynos4210_combiner_write(void *opaque, hwaddr offset,
 275         uint64_t val, unsigned size)
 276 {
 277     struct Exynos4210CombinerState *s =
 278             (struct Exynos4210CombinerState *)opaque;
 279     uint32_t req_quad_base_n;    /* Base of registers quad. Multiply it by 4 and
 280                                    get a start of corresponding group quad */
 281     uint32_t grp_quad_base_n;    /* Base of group quad */
 282     uint32_t reg_n;              /* Register number inside the quad */
 283
 284     req_quad_base_n = offset >> 4;
 285     grp_quad_base_n = req_quad_base_n << 2;
 286     reg_n = (offset - (req_quad_base_n << 4)) >> 2;
 287
 288     if (req_quad_base_n >= IIC_NGRP) {
 289         hw_error("exynos4210.combiner: unallowed write access at offset 0x"
 290                 TARGET_FMT_plx "\n", offset);
 291         return;
 292     }
 293
 294     if (reg_n > 1) {
 295         hw_error("exynos4210.combiner: unallowed write access at offset 0x"
 296                 TARGET_FMT_plx "\n", offset);
 297         return;
 298     }
 299
 300     if (offset >> 2 >= IIC_REGSET_SIZE) {
 301         hw_error("exynos4210.combiner: overflow of reg_set by 0x"
 302                 TARGET_FMT_plx "offset\n", offset);
 303     }
 304     s->reg_set[offset >> 2] = val;
 305
 306     switch (reg_n) {
 307     /* IIESR */
 308     case 0:
 309         /* FIXME: what if irq is pending, allowed by mask, and we allow it
 310          * again. Interrupt will rise again! */
 311
 312         DPRINTF("%s enable IRQ for groups %d, %d, %d, %d\n",
 313                 s->external ? "EXT" : "INT",
 314                 grp_quad_base_n,
 315                 grp_quad_base_n + 1,
 316                 grp_quad_base_n + 2,
 317                 grp_quad_base_n + 3);
 318
 319         /* Enable interrupt sources */
 320         s->group[grp_quad_base_n].src_mask |= val & 0xFF;
 321         s->group[grp_quad_base_n + 1].src_mask |= (val & 0xFF00) >> 8;
 322         s->group[grp_quad_base_n + 2].src_mask |= (val & 0xFF0000) >> 16;
 323         s->group[grp_quad_base_n + 3].src_mask |= (val & 0xFF000000) >> 24;
 324
 325         exynos4210_combiner_update(s, grp_quad_base_n);
 326         exynos4210_combiner_update(s, grp_quad_base_n + 1);
 327         exynos4210_combiner_update(s, grp_quad_base_n + 2);
 328         exynos4210_combiner_update(s, grp_quad_base_n + 3);
 329         break;
 330         /* IIECR */
 331     case 1:
 332         DPRINTF("%s disable IRQ for groups %d, %d, %d, %d\n",
 333                 s->external ? "EXT" : "INT",
 334                 grp_quad_base_n,
 335                 grp_quad_base_n + 1,
 336                 grp_quad_base_n + 2,
 337                 grp_quad_base_n + 3);
 338
 339         /* Disable interrupt sources */
 340         s->group[grp_quad_base_n].src_mask &= ~(val & 0xFF);
 341         s->group[grp_quad_base_n + 1].src_mask &= ~((val & 0xFF00) >> 8);
 342         s->group[grp_quad_base_n + 2].src_mask &= ~((val & 0xFF0000) >> 16);
 343         s->group[grp_quad_base_n + 3].src_mask &= ~((val & 0xFF000000) >> 24);
 344
 345         exynos4210_combiner_update(s, grp_quad_base_n);
 346         exynos4210_combiner_update(s, grp_quad_base_n + 1);
 347         exynos4210_combiner_update(s, grp_quad_base_n + 2);
 348         exynos4210_combiner_update(s, grp_quad_base_n + 3);
 349         break;
 350     default:
 351         hw_error("exynos4210.combiner: unallowed write access at offset 0x"
 352                 TARGET_FMT_plx "\n", offset);
 353         break;
 354     }
 355 }
 356
 357 /* Get combiner group and bit from irq number */
 358 static uint8_t get_combiner_group_and_bit(int irq, uint8_t *bit)
 359 {
 360     *bit = irq - ((irq >> 3) << 3);
 361     return irq >> 3;
 362 }
 363
 364 /* Process a change in an external IRQ input.  */
 365 static void exynos4210_combiner_handler(void *opaque, int irq, int level)
 366 {
 367     struct Exynos4210CombinerState *s =
 368             (struct Exynos4210CombinerState *)opaque;
 369     uint8_t bit_n, group_n;
 370
 371     group_n = get_combiner_group_and_bit(irq, &bit_n);
 372
 373     if (s->external && group_n >= EXYNOS4210_MAX_EXT_COMBINER_OUT_IRQ) {
 374         DPRINTF("%s unallowed IRQ group 0x%x\n", s->external ? "EXT" : "INT"
 375                 , group_n);
 376         return;
 377     }
 378
 379     if (level) {
 380         s->group[group_n].src_pending |= 1 << bit_n;
 381     } else {
 382         s->group[group_n].src_pending &= ~(1 << bit_n);
 383     }
 384
 385     exynos4210_combiner_update(s, group_n);
 386 }
 387
 388 static void exynos4210_combiner_reset(DeviceState *d)
 389 {
 390     struct Exynos4210CombinerState *s = (struct Exynos4210CombinerState *)d;
 391
 392     memset(&s->group, 0, sizeof(s->group));
 393     memset(&s->reg_set, 0, sizeof(s->reg_set));
 394
 395     s->reg_set[0xC0 >> 2] = 0x01010101;
 396     s->reg_set[0xC4 >> 2] = 0x01010101;
 397     s->reg_set[0xD0 >> 2] = 0x01010101;
 398     s->reg_set[0xD4 >> 2] = 0x01010101;
 399 }
 400
 401 static const MemoryRegionOps exynos4210_combiner_ops = {
 402     .read = exynos4210_combiner_read,
 403     .write = exynos4210_combiner_write,
 404     .endianness = DEVICE_NATIVE_ENDIAN,
 405 };
 406
 407 /*
 408  * Internal Combiner initialization.
 409  */
 410 static int exynos4210_combiner_init(SysBusDevice *sbd)
 411 {
 412     DeviceState *dev = DEVICE(sbd);
 413     Exynos4210CombinerState *s = EXYNOS4210_COMBINER(dev);
 414     unsigned int i;
 415
 416     /* Allocate general purpose input signals and connect a handler to each of
 417      * them */
 418     qdev_init_gpio_in(dev, exynos4210_combiner_handler, IIC_NIRQ);
 419
 420     /* Connect SysBusDev irqs to device specific irqs */
 421     for (i = 0; i < IIC_NIRQ; i++) {
 422         sysbus_init_irq(sbd, &s->output_irq[i]);
 423     }
 424
 425     memory_region_init_io(&s->iomem, OBJECT(s), &exynos4210_combiner_ops, s,
 426                           "exynos4210-combiner", IIC_REGION_SIZE);
 427     sysbus_init_mmio(sbd, &s->iomem);
 428
 429     return 0;
 430 }
 431
 432 static Property exynos4210_combiner_properties[] = {
 433     DEFINE_PROP_UINT32("external", Exynos4210CombinerState, external, 0),
 434     DEFINE_PROP_END_OF_LIST(),
 435 };
 436
 437 static void exynos4210_combiner_class_init(ObjectClass *klass, void *data)
 438 {
 439     DeviceClass *dc = DEVICE_CLASS(klass);
 440     SysBusDeviceClass *k = SYS_BUS_DEVICE_CLASS(klass);
 441
 442     k->init = exynos4210_combiner_init;
 443     dc->reset = exynos4210_combiner_reset;
 444     dc->props = exynos4210_combiner_properties;
 445     dc->vmsd = &vmstate_exynos4210_combiner;
 446 }
 447
 448 static const TypeInfo exynos4210_combiner_info = {
 449     .name          = TYPE_EXYNOS4210_COMBINER,
 450     .parent        = TYPE_SYS_BUS_DEVICE,
 451     .instance_size = sizeof(Exynos4210CombinerState),
 452     .class_init    = exynos4210_combiner_class_init,
 453 };
 454
 455 static void exynos4210_combiner_register_types(void)
 456 {
 457     type_register_static(&exynos4210_combiner_info);
 458 }
 459
 460 type_init(exynos4210_combiner_register_types)