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 "qemu/osdep.h"
  31#include "hw/sysbus.h"
  32#include "migration/vmstate.h"
  33#include "qemu/module.h"
  34
  35#include "hw/arm/exynos4210.h"
  36#include "hw/hw.h"
  37#include "hw/irq.h"
  38#include "hw/qdev-properties.h"
  39
  40//#define DEBUG_COMBINER
  41
  42#ifdef DEBUG_COMBINER
  43#define DPRINTF(fmt, ...) \
  44        do { fprintf(stdout, "COMBINER: [%s:%d] " fmt, __func__ , __LINE__, \
  45                ## __VA_ARGS__); } while (0)
  46#else
  47#define DPRINTF(fmt, ...) do {} while (0)
  48#endif
  49
  50#define    IIC_NGRP        64            /* Internal Interrupt Combiner
  51                                            Groups number */
  52#define    IIC_NIRQ        (IIC_NGRP * 8)/* Internal Interrupt Combiner
  53                                            Interrupts number */
  54#define IIC_REGION_SIZE    0x108         /* Size of memory mapped region */
  55#define IIC_REGSET_SIZE    0x41
  56
  57/*
  58 * State for each output signal of internal combiner
  59 */
  60typedef struct CombinerGroupState {
  61    uint8_t src_mask;            /* 1 - source enabled, 0 - disabled */
  62    uint8_t src_pending;        /* Pending source interrupts before masking */
  63} CombinerGroupState;
  64
  65#define TYPE_EXYNOS4210_COMBINER "exynos4210.combiner"
  66#define EXYNOS4210_COMBINER(obj) \
  67    OBJECT_CHECK(Exynos4210CombinerState, (obj), TYPE_EXYNOS4210_COMBINER)
  68
  69typedef struct Exynos4210CombinerState {
  70    SysBusDevice parent_obj;
  71
  72    MemoryRegion iomem;
  73
  74    struct CombinerGroupState group[IIC_NGRP];
  75    uint32_t reg_set[IIC_REGSET_SIZE];
  76    uint32_t icipsr[2];
  77    uint32_t external;          /* 1 means that this combiner is external */
  78
  79    qemu_irq output_irq[IIC_NGRP];
  80} Exynos4210CombinerState;
  81
  82static const VMStateDescription vmstate_exynos4210_combiner_group_state = {
  83    .name = "exynos4210.combiner.groupstate",
  84    .version_id = 1,
  85    .minimum_version_id = 1,
  86    .fields = (VMStateField[]) {
  87        VMSTATE_UINT8(src_mask, CombinerGroupState),
  88        VMSTATE_UINT8(src_pending, CombinerGroupState),
  89        VMSTATE_END_OF_LIST()
  90    }
  91};
  92
  93static const VMStateDescription vmstate_exynos4210_combiner = {
  94    .name = "exynos4210.combiner",
  95    .version_id = 1,
  96    .minimum_version_id = 1,
  97    .fields = (VMStateField[]) {
  98        VMSTATE_STRUCT_ARRAY(group, Exynos4210CombinerState, IIC_NGRP, 0,
  99                vmstate_exynos4210_combiner_group_state, CombinerGroupState),
 100        VMSTATE_UINT32_ARRAY(reg_set, Exynos4210CombinerState,
 101                IIC_REGSET_SIZE),
 102        VMSTATE_UINT32_ARRAY(icipsr, Exynos4210CombinerState, 2),
 103        VMSTATE_UINT32(external, Exynos4210CombinerState),
 104        VMSTATE_END_OF_LIST()
 105    }
 106};
 107
 108/*
 109 * Get Combiner input GPIO into irqs structure
 110 */
 111void exynos4210_combiner_get_gpioin(Exynos4210Irq *irqs, DeviceState *dev,
 112        int ext)
 113{
 114    int n;
 115    int bit;
 116    int max;
 117    qemu_irq *irq;
 118
 119    max = ext ? EXYNOS4210_MAX_EXT_COMBINER_IN_IRQ :
 120        EXYNOS4210_MAX_INT_COMBINER_IN_IRQ;
 121    irq = ext ? irqs->ext_combiner_irq : irqs->int_combiner_irq;
 122
 123    /*
 124     * Some IRQs of Int/External Combiner are going to two Combiners groups,
 125     * so let split them.
 126     */
 127    for (n = 0; n < max; n++) {
 128
 129        bit = EXYNOS4210_COMBINER_GET_BIT_NUM(n);
 130
 131        switch (n) {
 132        /* MDNIE_LCD1 INTG1 */
 133        case EXYNOS4210_COMBINER_GET_IRQ_NUM(1, 0) ...
 134             EXYNOS4210_COMBINER_GET_IRQ_NUM(1, 3):
 135            irq[n] = qemu_irq_split(qdev_get_gpio_in(dev, n),
 136                    irq[EXYNOS4210_COMBINER_GET_IRQ_NUM(0, bit + 4)]);
 137            continue;
 138
 139        /* TMU INTG3 */
 140        case EXYNOS4210_COMBINER_GET_IRQ_NUM(3, 4):
 141            irq[n] = qemu_irq_split(qdev_get_gpio_in(dev, n),
 142                    irq[EXYNOS4210_COMBINER_GET_IRQ_NUM(2, bit)]);
 143            continue;
 144
 145        /* LCD1 INTG12 */
 146        case EXYNOS4210_COMBINER_GET_IRQ_NUM(12, 0) ...
 147             EXYNOS4210_COMBINER_GET_IRQ_NUM(12, 3):
 148            irq[n] = qemu_irq_split(qdev_get_gpio_in(dev, n),
 149                    irq[EXYNOS4210_COMBINER_GET_IRQ_NUM(11, bit + 4)]);
 150            continue;
 151
 152        /* Multi-Core Timer INTG12 */
 153        case EXYNOS4210_COMBINER_GET_IRQ_NUM(12, 4) ...
 154             EXYNOS4210_COMBINER_GET_IRQ_NUM(12, 8):
 155               irq[n] = qemu_irq_split(qdev_get_gpio_in(dev, n),
 156                       irq[EXYNOS4210_COMBINER_GET_IRQ_NUM(1, bit + 4)]);
 157            continue;
 158
 159        /* Multi-Core Timer INTG35 */
 160        case EXYNOS4210_COMBINER_GET_IRQ_NUM(35, 4) ...
 161             EXYNOS4210_COMBINER_GET_IRQ_NUM(35, 8):
 162            irq[n] = qemu_irq_split(qdev_get_gpio_in(dev, n),
 163                    irq[EXYNOS4210_COMBINER_GET_IRQ_NUM(1, bit + 4)]);
 164            continue;
 165
 166        /* Multi-Core Timer INTG51 */
 167        case EXYNOS4210_COMBINER_GET_IRQ_NUM(51, 4) ...
 168             EXYNOS4210_COMBINER_GET_IRQ_NUM(51, 8):
 169            irq[n] = qemu_irq_split(qdev_get_gpio_in(dev, n),
 170                    irq[EXYNOS4210_COMBINER_GET_IRQ_NUM(1, bit + 4)]);
 171            continue;
 172
 173        /* Multi-Core Timer INTG53 */
 174        case EXYNOS4210_COMBINER_GET_IRQ_NUM(53, 4) ...
 175             EXYNOS4210_COMBINER_GET_IRQ_NUM(53, 8):
 176            irq[n] = qemu_irq_split(qdev_get_gpio_in(dev, n),
 177                    irq[EXYNOS4210_COMBINER_GET_IRQ_NUM(1, bit + 4)]);
 178            continue;
 179        }
 180
 181        irq[n] = qdev_get_gpio_in(dev, n);
 182    }
 183}
 184
 185static uint64_t
 186exynos4210_combiner_read(void *opaque, hwaddr offset, unsigned size)
 187{
 188    struct Exynos4210CombinerState *s =
 189            (struct Exynos4210CombinerState *)opaque;
 190    uint32_t req_quad_base_n;    /* Base of registers quad. Multiply it by 4 and
 191                                   get a start of corresponding group quad */
 192    uint32_t grp_quad_base_n;    /* Base of group quad */
 193    uint32_t reg_n;              /* Register number inside the quad */
 194    uint32_t val;
 195
 196    req_quad_base_n = offset >> 4;
 197    grp_quad_base_n = req_quad_base_n << 2;
 198    reg_n = (offset - (req_quad_base_n << 4)) >> 2;
 199
 200    if (req_quad_base_n >= IIC_NGRP) {
 201        /* Read of ICIPSR register */
 202        return s->icipsr[reg_n];
 203    }
 204
 205    val = 0;
 206
 207    switch (reg_n) {
 208    /* IISTR */
 209    case 2:
 210        val |= s->group[grp_quad_base_n].src_pending;
 211        val |= s->group[grp_quad_base_n + 1].src_pending << 8;
 212        val |= s->group[grp_quad_base_n + 2].src_pending << 16;
 213        val |= s->group[grp_quad_base_n + 3].src_pending << 24;
 214        break;
 215    /* IIMSR */
 216    case 3:
 217        val |= s->group[grp_quad_base_n].src_mask &
 218        s->group[grp_quad_base_n].src_pending;
 219        val |= (s->group[grp_quad_base_n + 1].src_mask &
 220                s->group[grp_quad_base_n + 1].src_pending) << 8;
 221        val |= (s->group[grp_quad_base_n + 2].src_mask &
 222                s->group[grp_quad_base_n + 2].src_pending) << 16;
 223        val |= (s->group[grp_quad_base_n + 3].src_mask &
 224                s->group[grp_quad_base_n + 3].src_pending) << 24;
 225        break;
 226    default:
 227        if (offset >> 2 >= IIC_REGSET_SIZE) {
 228            hw_error("exynos4210.combiner: overflow of reg_set by 0x"
 229                    TARGET_FMT_plx "offset\n", offset);
 230        }
 231        val = s->reg_set[offset >> 2];
 232        return 0;
 233    }
 234    return val;
 235}
 236
 237static void exynos4210_combiner_update(void *opaque, uint8_t group_n)
 238{
 239    struct Exynos4210CombinerState *s =
 240            (struct Exynos4210CombinerState *)opaque;
 241
 242    /* Send interrupt if needed */
 243    if (s->group[group_n].src_mask & s->group[group_n].src_pending) {
 244#ifdef DEBUG_COMBINER
 245        if (group_n != 26) {
 246            /* skip uart */
 247            DPRINTF("%s raise IRQ[%d]\n", s->external ? "EXT" : "INT", group_n);
 248        }
 249#endif
 250
 251        /* Set Combiner interrupt pending status after masking */
 252        if (group_n >= 32) {
 253            s->icipsr[1] |= 1 << (group_n - 32);
 254        } else {
 255            s->icipsr[0] |= 1 << group_n;
 256        }
 257
 258        qemu_irq_raise(s->output_irq[group_n]);
 259    } else {
 260#ifdef DEBUG_COMBINER
 261        if (group_n != 26) {
 262            /* skip uart */
 263            DPRINTF("%s lower IRQ[%d]\n", s->external ? "EXT" : "INT", group_n);
 264        }
 265#endif
 266
 267        /* Set Combiner interrupt pending status after masking */
 268        if (group_n >= 32) {
 269            s->icipsr[1] &= ~(1 << (group_n - 32));
 270        } else {
 271            s->icipsr[0] &= ~(1 << group_n);
 272        }
 273
 274        qemu_irq_lower(s->output_irq[group_n]);
 275    }
 276}
 277
 278static void exynos4210_combiner_write(void *opaque, hwaddr offset,
 279        uint64_t val, unsigned size)
 280{
 281    struct Exynos4210CombinerState *s =
 282            (struct Exynos4210CombinerState *)opaque;
 283    uint32_t req_quad_base_n;    /* Base of registers quad. Multiply it by 4 and
 284                                   get a start of corresponding group quad */
 285    uint32_t grp_quad_base_n;    /* Base of group quad */
 286    uint32_t reg_n;              /* Register number inside the quad */
 287
 288    req_quad_base_n = offset >> 4;
 289    grp_quad_base_n = req_quad_base_n << 2;
 290    reg_n = (offset - (req_quad_base_n << 4)) >> 2;
 291
 292    if (req_quad_base_n >= IIC_NGRP) {
 293        hw_error("exynos4210.combiner: unallowed write access at offset 0x"
 294                TARGET_FMT_plx "\n", offset);
 295        return;
 296    }
 297
 298    if (reg_n > 1) {
 299        hw_error("exynos4210.combiner: unallowed write access at offset 0x"
 300                TARGET_FMT_plx "\n", offset);
 301        return;
 302    }
 303
 304    if (offset >> 2 >= IIC_REGSET_SIZE) {
 305        hw_error("exynos4210.combiner: overflow of reg_set by 0x"
 306                TARGET_FMT_plx "offset\n", offset);
 307    }
 308    s->reg_set[offset >> 2] = val;
 309
 310    switch (reg_n) {
 311    /* IIESR */
 312    case 0:
 313        /* FIXME: what if irq is pending, allowed by mask, and we allow it
 314         * again. Interrupt will rise again! */
 315
 316        DPRINTF("%s enable IRQ for groups %d, %d, %d, %d\n",
 317                s->external ? "EXT" : "INT",
 318                grp_quad_base_n,
 319                grp_quad_base_n + 1,
 320                grp_quad_base_n + 2,
 321                grp_quad_base_n + 3);
 322
 323        /* Enable interrupt sources */
 324        s->group[grp_quad_base_n].src_mask |= val & 0xFF;
 325        s->group[grp_quad_base_n + 1].src_mask |= (val & 0xFF00) >> 8;
 326        s->group[grp_quad_base_n + 2].src_mask |= (val & 0xFF0000) >> 16;
 327        s->group[grp_quad_base_n + 3].src_mask |= (val & 0xFF000000) >> 24;
 328
 329        exynos4210_combiner_update(s, grp_quad_base_n);
 330        exynos4210_combiner_update(s, grp_quad_base_n + 1);
 331        exynos4210_combiner_update(s, grp_quad_base_n + 2);
 332        exynos4210_combiner_update(s, grp_quad_base_n + 3);
 333        break;
 334        /* IIECR */
 335    case 1:
 336        DPRINTF("%s disable IRQ for groups %d, %d, %d, %d\n",
 337                s->external ? "EXT" : "INT",
 338                grp_quad_base_n,
 339                grp_quad_base_n + 1,
 340                grp_quad_base_n + 2,
 341                grp_quad_base_n + 3);
 342
 343        /* Disable interrupt sources */
 344        s->group[grp_quad_base_n].src_mask &= ~(val & 0xFF);
 345        s->group[grp_quad_base_n + 1].src_mask &= ~((val & 0xFF00) >> 8);
 346        s->group[grp_quad_base_n + 2].src_mask &= ~((val & 0xFF0000) >> 16);
 347        s->group[grp_quad_base_n + 3].src_mask &= ~((val & 0xFF000000) >> 24);
 348
 349        exynos4210_combiner_update(s, grp_quad_base_n);
 350        exynos4210_combiner_update(s, grp_quad_base_n + 1);
 351        exynos4210_combiner_update(s, grp_quad_base_n + 2);
 352        exynos4210_combiner_update(s, grp_quad_base_n + 3);
 353        break;
 354    default:
 355        hw_error("exynos4210.combiner: unallowed write access at offset 0x"
 356                TARGET_FMT_plx "\n", offset);
 357        break;
 358    }
 359}
 360
 361/* Get combiner group and bit from irq number */
 362static uint8_t get_combiner_group_and_bit(int irq, uint8_t *bit)
 363{
 364    *bit = irq - ((irq >> 3) << 3);
 365    return irq >> 3;
 366}
 367
 368/* Process a change in an external IRQ input.  */
 369static void exynos4210_combiner_handler(void *opaque, int irq, int level)
 370{
 371    struct Exynos4210CombinerState *s =
 372            (struct Exynos4210CombinerState *)opaque;
 373    uint8_t bit_n, group_n;
 374
 375    group_n = get_combiner_group_and_bit(irq, &bit_n);
 376
 377    if (s->external && group_n >= EXYNOS4210_MAX_EXT_COMBINER_OUT_IRQ) {
 378        DPRINTF("%s unallowed IRQ group 0x%x\n", s->external ? "EXT" : "INT"
 379                , group_n);
 380        return;
 381    }
 382
 383    if (level) {
 384        s->group[group_n].src_pending |= 1 << bit_n;
 385    } else {
 386        s->group[group_n].src_pending &= ~(1 << bit_n);
 387    }
 388
 389    exynos4210_combiner_update(s, group_n);
 390}
 391
 392static void exynos4210_combiner_reset(DeviceState *d)
 393{
 394    struct Exynos4210CombinerState *s = (struct Exynos4210CombinerState *)d;
 395
 396    memset(&s->group, 0, sizeof(s->group));
 397    memset(&s->reg_set, 0, sizeof(s->reg_set));
 398
 399    s->reg_set[0xC0 >> 2] = 0x01010101;
 400    s->reg_set[0xC4 >> 2] = 0x01010101;
 401    s->reg_set[0xD0 >> 2] = 0x01010101;
 402    s->reg_set[0xD4 >> 2] = 0x01010101;
 403}
 404
 405static const MemoryRegionOps exynos4210_combiner_ops = {
 406    .read = exynos4210_combiner_read,
 407    .write = exynos4210_combiner_write,
 408    .endianness = DEVICE_NATIVE_ENDIAN,
 409};
 410
 411/*
 412 * Internal Combiner initialization.
 413 */
 414static void exynos4210_combiner_init(Object *obj)
 415{
 416    DeviceState *dev = DEVICE(obj);
 417    Exynos4210CombinerState *s = EXYNOS4210_COMBINER(obj);
 418    SysBusDevice *sbd = SYS_BUS_DEVICE(obj);
 419    unsigned int i;
 420
 421    /* Allocate general purpose input signals and connect a handler to each of
 422     * them */
 423    qdev_init_gpio_in(dev, exynos4210_combiner_handler, IIC_NIRQ);
 424
 425    /* Connect SysBusDev irqs to device specific irqs */
 426    for (i = 0; i < IIC_NGRP; i++) {
 427        sysbus_init_irq(sbd, &s->output_irq[i]);
 428    }
 429
 430    memory_region_init_io(&s->iomem, obj, &exynos4210_combiner_ops, s,
 431                          "exynos4210-combiner", IIC_REGION_SIZE);
 432    sysbus_init_mmio(sbd, &s->iomem);
 433}
 434
 435static Property exynos4210_combiner_properties[] = {
 436    DEFINE_PROP_UINT32("external", Exynos4210CombinerState, external, 0),
 437    DEFINE_PROP_END_OF_LIST(),
 438};
 439
 440static void exynos4210_combiner_class_init(ObjectClass *klass, void *data)
 441{
 442    DeviceClass *dc = DEVICE_CLASS(klass);
 443
 444    dc->reset = exynos4210_combiner_reset;
 445    dc->props = exynos4210_combiner_properties;
 446    dc->vmsd = &vmstate_exynos4210_combiner;
 447}
 448
 449static const TypeInfo exynos4210_combiner_info = {
 450    .name          = TYPE_EXYNOS4210_COMBINER,
 451    .parent        = TYPE_SYS_BUS_DEVICE,
 452    .instance_size = sizeof(Exynos4210CombinerState),
 453    .instance_init = exynos4210_combiner_init,
 454    .class_init    = exynos4210_combiner_class_init,
 455};
 456
 457static void exynos4210_combiner_register_types(void)
 458{
 459    type_register_static(&exynos4210_combiner_info);
 460}
 461
 462type_init(exynos4210_combiner_register_types)
 463