LXR qemu/hw/intc/exynos4210

   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 */
  54typedef 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
  63typedef 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
  76static 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
  88static 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 */
 107void 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
 181static uint64_t
 182exynos4210_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
 233static 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
 274static 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 */
 358static 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.  */
 365static 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
 388static 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
 401static 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 */
 410static 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_NGRP; 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
 432static Property exynos4210_combiner_properties[] = {
 433    DEFINE_PROP_UINT32("external", Exynos4210CombinerState, external, 0),
 434    DEFINE_PROP_END_OF_LIST(),
 435};
 436
 437static 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
 448static 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
 455static void exynos4210_combiner_register_types(void)
 456{
 457    type_register_static(&exynos4210_combiner_info);
 458}
 459
 460type_init(exynos4210_combiner_register_types)
 461