hw/intc/loongarch_pch_msi.c

   1 /* SPDX-License-Identifier: GPL-2.0-or-later */
   2 /*
   3  * QEMU Loongson 7A1000 msi interrupt controller.
   4  *
   5  * Copyright (C) 2021 Loongson Technology Corporation Limited
   6  */
   7
   8 #include "qemu/osdep.h"
   9 #include "hw/sysbus.h"
  10 #include "hw/irq.h"
  11 #include "hw/intc/loongarch_pch_msi.h"
  12 #include "hw/intc/loongarch_pch_pic.h"
  13 #include "hw/pci/msi.h"
  14 #include "hw/misc/unimp.h"
  15 #include "migration/vmstate.h"
  16 #include "trace.h"
  17
  18 static uint64_t loongarch_msi_mem_read(void *opaque, hwaddr addr, unsigned size)
  19 {
  20     return 0;
  21 }
  22
  23 static void loongarch_msi_mem_write(void *opaque, hwaddr addr,
  24                                     uint64_t val, unsigned size)
  25 {
  26     LoongArchPCHMSI *s = LOONGARCH_PCH_MSI(opaque);
  27     int irq_num = val & 0xff;
  28
  29     trace_loongarch_msi_set_irq(irq_num);
  30     assert(irq_num < PCH_MSI_IRQ_NUM);
  31     qemu_set_irq(s->pch_msi_irq[irq_num], 1);
  32 }
  33
  34 static const MemoryRegionOps loongarch_pch_msi_ops = {
  35     .read  = loongarch_msi_mem_read,
  36     .write = loongarch_msi_mem_write,
  37     .endianness = DEVICE_LITTLE_ENDIAN,
  38 };
  39
  40 static void pch_msi_irq_handler(void *opaque, int irq, int level)
  41 {
  42     LoongArchPCHMSI *s = LOONGARCH_PCH_MSI(opaque);
  43
  44     qemu_set_irq(s->pch_msi_irq[irq], level);
  45 }
  46
  47 static void loongarch_pch_msi_init(Object *obj)
  48 {
  49     LoongArchPCHMSI *s = LOONGARCH_PCH_MSI(obj);
  50     SysBusDevice *sbd = SYS_BUS_DEVICE(obj);
  51
  52     memory_region_init_io(&s->msi_mmio, obj, &loongarch_pch_msi_ops,
  53                           s, TYPE_LOONGARCH_PCH_MSI, 0x8);
  54     sysbus_init_mmio(sbd, &s->msi_mmio);
  55     msi_nonbroken = true;
  56
  57     qdev_init_gpio_out(DEVICE(obj), s->pch_msi_irq, PCH_MSI_IRQ_NUM);
  58     qdev_init_gpio_in(DEVICE(obj), pch_msi_irq_handler, PCH_MSI_IRQ_NUM);
  59 }
  60
  61 static const TypeInfo loongarch_pch_msi_info = {
  62     .name          = TYPE_LOONGARCH_PCH_MSI,
  63     .parent        = TYPE_SYS_BUS_DEVICE,
  64     .instance_size = sizeof(LoongArchPCHMSI),
  65     .instance_init = loongarch_pch_msi_init,
  66 };
  67
  68 static void loongarch_pch_msi_register_types(void)
  69 {
  70     type_register_static(&loongarch_pch_msi_info);
  71 }
  72
  73 type_init(loongarch_pch_msi_register_types)