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) 74