hw/intc/allwinner-a10-pic.c

   1 /*
   2  * Allwinner A10 interrupt controller device emulation
   3  *
   4  * Copyright (C) 2013 Li Guang
   5  * Written by Li Guang <[email protected]>
   6  *
   7  * This program is free software; you can redistribute it and/or modify it
   8  * under the terms of the GNU General Public License as published by the
   9  * Free Software Foundation; either version 2 of the License, or
  10  * (at your option) any later version.
  11  *
  12  * This program is distributed in the hope that it will be useful, but WITHOUT
  13  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  14  * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
  15  * for more details.
  16  */
  17
  18 #include "qemu/osdep.h"
  19 #include "hw/sysbus.h"
  20 #include "hw/devices.h"
  21 #include "sysemu/sysemu.h"
  22 #include "hw/intc/allwinner-a10-pic.h"
  23 #include "qemu/log.h"
  24
  25 static void aw_a10_pic_update(AwA10PICState *s)
  26 {
  27     uint8_t i;
  28     int irq = 0, fiq = 0, zeroes;
  29
  30     s->vector = 0;
  31
  32     for (i = 0; i < AW_A10_PIC_REG_NUM; i++) {
  33         irq |= s->irq_pending[i] & ~s->mask[i];
  34         fiq |= s->select[i] & s->irq_pending[i] & ~s->mask[i];
  35
  36         if (!s->vector) {
  37             zeroes = ctz32(s->irq_pending[i] & ~s->mask[i]);
  38             if (zeroes != 32) {
  39                 s->vector = (i * 32 + zeroes) * 4;
  40             }
  41         }
  42     }
  43
  44     qemu_set_irq(s->parent_irq, !!irq);
  45     qemu_set_irq(s->parent_fiq, !!fiq);
  46 }
  47
  48 static void aw_a10_pic_set_irq(void *opaque, int irq, int level)
  49 {
  50     AwA10PICState *s = opaque;
  51
  52     if (level) {
  53         set_bit(irq % 32, (void *)&s->irq_pending[irq / 32]);
  54     } else {
  55         clear_bit(irq % 32, (void *)&s->irq_pending[irq / 32]);
  56     }
  57     aw_a10_pic_update(s);
  58 }
  59
  60 static uint64_t aw_a10_pic_read(void *opaque, hwaddr offset, unsigned size)
  61 {
  62     AwA10PICState *s = opaque;
  63     uint8_t index = (offset & 0xc) / 4;
  64
  65     switch (offset) {
  66     case AW_A10_PIC_VECTOR:
  67         return s->vector;
  68     case AW_A10_PIC_BASE_ADDR:
  69         return s->base_addr;
  70     case AW_A10_PIC_PROTECT:
  71         return s->protect;
  72     case AW_A10_PIC_NMI:
  73         return s->nmi;
  74     case AW_A10_PIC_IRQ_PENDING ... AW_A10_PIC_IRQ_PENDING + 8:
  75         return s->irq_pending[index];
  76     case AW_A10_PIC_FIQ_PENDING ... AW_A10_PIC_FIQ_PENDING + 8:
  77         return s->fiq_pending[index];
  78     case AW_A10_PIC_SELECT ... AW_A10_PIC_SELECT + 8:
  79         return s->select[index];
  80     case AW_A10_PIC_ENABLE ... AW_A10_PIC_ENABLE + 8:
  81         return s->enable[index];
  82     case AW_A10_PIC_MASK ... AW_A10_PIC_MASK + 8:
  83         return s->mask[index];
  84     default:
  85         qemu_log_mask(LOG_GUEST_ERROR,
  86                       "%s: Bad offset 0x%x\n",  __func__, (int)offset);
  87         break;
  88     }
  89
  90     return 0;
  91 }
  92
  93 static void aw_a10_pic_write(void *opaque, hwaddr offset, uint64_t value,
  94                              unsigned size)
  95 {
  96     AwA10PICState *s = opaque;
  97     uint8_t index = (offset & 0xc) / 4;
  98
  99     switch (offset) {
 100     case AW_A10_PIC_BASE_ADDR:
 101         s->base_addr = value & ~0x3;
 102         break;
 103     case AW_A10_PIC_PROTECT:
 104         s->protect = value;
 105         break;
 106     case AW_A10_PIC_NMI:
 107         s->nmi = value;
 108         break;
 109     case AW_A10_PIC_IRQ_PENDING ... AW_A10_PIC_IRQ_PENDING + 8:
 110         /*
 111          * The register is read-only; nevertheless, Linux (including
 112          * the version originally shipped by Allwinner) pretends to
 113          * write to the register. Just ignore it.
 114          */
 115         break;
 116     case AW_A10_PIC_FIQ_PENDING ... AW_A10_PIC_FIQ_PENDING + 8:
 117         s->fiq_pending[index] &= ~value;
 118         break;
 119     case AW_A10_PIC_SELECT ... AW_A10_PIC_SELECT + 8:
 120         s->select[index] = value;
 121         break;
 122     case AW_A10_PIC_ENABLE ... AW_A10_PIC_ENABLE + 8:
 123         s->enable[index] = value;
 124         break;
 125     case AW_A10_PIC_MASK ... AW_A10_PIC_MASK + 8:
 126         s->mask[index] = value;
 127         break;
 128     default:
 129         qemu_log_mask(LOG_GUEST_ERROR,
 130                       "%s: Bad offset 0x%x\n",  __func__, (int)offset);
 131         break;
 132     }
 133
 134     aw_a10_pic_update(s);
 135 }
 136
 137 static const MemoryRegionOps aw_a10_pic_ops = {
 138     .read = aw_a10_pic_read,
 139     .write = aw_a10_pic_write,
 140     .endianness = DEVICE_NATIVE_ENDIAN,
 141 };
 142
 143 static const VMStateDescription vmstate_aw_a10_pic = {
 144     .name = "a10.pic",
 145     .version_id = 1,
 146     .minimum_version_id = 1,
 147     .fields = (VMStateField[]) {
 148         VMSTATE_UINT32(vector, AwA10PICState),
 149         VMSTATE_UINT32(base_addr, AwA10PICState),
 150         VMSTATE_UINT32(protect, AwA10PICState),
 151         VMSTATE_UINT32(nmi, AwA10PICState),
 152         VMSTATE_UINT32_ARRAY(irq_pending, AwA10PICState, AW_A10_PIC_REG_NUM),
 153         VMSTATE_UINT32_ARRAY(fiq_pending, AwA10PICState, AW_A10_PIC_REG_NUM),
 154         VMSTATE_UINT32_ARRAY(enable, AwA10PICState, AW_A10_PIC_REG_NUM),
 155         VMSTATE_UINT32_ARRAY(select, AwA10PICState, AW_A10_PIC_REG_NUM),
 156         VMSTATE_UINT32_ARRAY(mask, AwA10PICState, AW_A10_PIC_REG_NUM),
 157         VMSTATE_END_OF_LIST()
 158     }
 159 };
 160
 161 static void aw_a10_pic_init(Object *obj)
 162 {
 163     AwA10PICState *s = AW_A10_PIC(obj);
 164     SysBusDevice *dev = SYS_BUS_DEVICE(obj);
 165
 166      qdev_init_gpio_in(DEVICE(dev), aw_a10_pic_set_irq, AW_A10_PIC_INT_NR);
 167      sysbus_init_irq(dev, &s->parent_irq);
 168      sysbus_init_irq(dev, &s->parent_fiq);
 169      memory_region_init_io(&s->iomem, OBJECT(s), &aw_a10_pic_ops, s,
 170                            TYPE_AW_A10_PIC, 0x400);
 171      sysbus_init_mmio(dev, &s->iomem);
 172 }
 173
 174 static void aw_a10_pic_reset(DeviceState *d)
 175 {
 176     AwA10PICState *s = AW_A10_PIC(d);
 177     uint8_t i;
 178
 179     s->base_addr = 0;
 180     s->protect = 0;
 181     s->nmi = 0;
 182     s->vector = 0;
 183     for (i = 0; i < AW_A10_PIC_REG_NUM; i++) {
 184         s->irq_pending[i] = 0;
 185         s->fiq_pending[i] = 0;
 186         s->select[i] = 0;
 187         s->enable[i] = 0;
 188         s->mask[i] = 0;
 189     }
 190 }
 191
 192 static void aw_a10_pic_class_init(ObjectClass *klass, void *data)
 193 {
 194     DeviceClass *dc = DEVICE_CLASS(klass);
 195
 196     dc->reset = aw_a10_pic_reset;
 197     dc->desc = "allwinner a10 pic";
 198     dc->vmsd = &vmstate_aw_a10_pic;
 199  }
 200
 201 static const TypeInfo aw_a10_pic_info = {
 202     .name = TYPE_AW_A10_PIC,
 203     .parent = TYPE_SYS_BUS_DEVICE,
 204     .instance_size = sizeof(AwA10PICState),
 205     .instance_init = aw_a10_pic_init,
 206     .class_init = aw_a10_pic_class_init,
 207 };
 208
 209 static void aw_a10_register_types(void)
 210 {
 211     type_register_static(&aw_a10_pic_info);
 212 }
 213
 214 type_init(aw_a10_register_types);