hw/intc: Add LoongArch ls7a msi interrupt controller support(PCH-MSI)

This patch realize PCH-MSI interrupt controller.

Signed-off-by: Xiaojuan Yang <yangxiaojuan@loongson.cn>
Signed-off-by: Song Gao <gaosong@loongson.cn>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-Id: <20220606124333.2060567-34-yangxiaojuan@loongson.cn>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>

hw/intc/Kconfig

@@ -94,3 +94,8 @@ config LOONGARCH_IPI
 config LOONGARCH_PCH_PIC
     bool
     select UNIMP
+
+config LOONGARCH_PCH_MSI
+    select MSI_NONBROKEN
+    bool
+    select UNIMP

hw/intc/loongarch_pch_msi.c

@@ -0,0 +1,73 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+/*
+ * QEMU Loongson 7A1000 msi interrupt controller.
+ *
+ * Copyright (C) 2021 Loongson Technology Corporation Limited
+ */
+
+#include "qemu/osdep.h"
+#include "hw/sysbus.h"
+#include "hw/irq.h"
+#include "hw/intc/loongarch_pch_msi.h"
+#include "hw/intc/loongarch_pch_pic.h"
+#include "hw/pci/msi.h"
+#include "hw/misc/unimp.h"
+#include "migration/vmstate.h"
+#include "trace.h"
+
+static uint64_t loongarch_msi_mem_read(void *opaque, hwaddr addr, unsigned size)
+{
+    return 0;
+}
+
+static void loongarch_msi_mem_write(void *opaque, hwaddr addr,
+                                    uint64_t val, unsigned size)
+{
+    LoongArchPCHMSI *s = LOONGARCH_PCH_MSI(opaque);
+    int irq_num = val & 0xff;
+
+    trace_loongarch_msi_set_irq(irq_num);
+    assert(irq_num < PCH_MSI_IRQ_NUM);
+    qemu_set_irq(s->pch_msi_irq[irq_num], 1);
+}
+
+static const MemoryRegionOps loongarch_pch_msi_ops = {
+    .read  = loongarch_msi_mem_read,
+    .write = loongarch_msi_mem_write,
+    .endianness = DEVICE_LITTLE_ENDIAN,
+};
+
+static void pch_msi_irq_handler(void *opaque, int irq, int level)
+{
+    LoongArchPCHMSI *s = LOONGARCH_PCH_MSI(opaque);
+
+    qemu_set_irq(s->pch_msi_irq[irq], level);
+}
+
+static void loongarch_pch_msi_init(Object *obj)
+{
+    LoongArchPCHMSI *s = LOONGARCH_PCH_MSI(obj);
+    SysBusDevice *sbd = SYS_BUS_DEVICE(obj);
+
+    memory_region_init_io(&s->msi_mmio, obj, &loongarch_pch_msi_ops,
+                          s, TYPE_LOONGARCH_PCH_MSI, 0x8);
+    sysbus_init_mmio(sbd, &s->msi_mmio);
+    msi_nonbroken = true;
+
+    qdev_init_gpio_out(DEVICE(obj), s->pch_msi_irq, PCH_MSI_IRQ_NUM);
+    qdev_init_gpio_in(DEVICE(obj), pch_msi_irq_handler, PCH_MSI_IRQ_NUM);
+}
+
+static const TypeInfo loongarch_pch_msi_info = {
+    .name          = TYPE_LOONGARCH_PCH_MSI,
+    .parent        = TYPE_SYS_BUS_DEVICE,
+    .instance_size = sizeof(LoongArchPCHMSI),
+    .instance_init = loongarch_pch_msi_init,
+};
+
+static void loongarch_pch_msi_register_types(void)
+{
+    type_register_static(&loongarch_pch_msi_info);
+}
+
+type_init(loongarch_pch_msi_register_types)

hw/intc/meson.build

@@ -65,3 +65,4 @@ specific_ss.add(when: 'CONFIG_M68K_IRQC', if_true: files('m68k_irqc.c'))
 specific_ss.add(when: 'CONFIG_NIOS2_VIC', if_true: files('nios2_vic.c'))
 specific_ss.add(when: 'CONFIG_LOONGARCH_IPI', if_true: files('loongarch_ipi.c'))
 specific_ss.add(when: 'CONFIG_LOONGARCH_PCH_PIC', if_true: files('loongarch_pch_pic.c'))
+specific_ss.add(when: 'CONFIG_LOONGARCH_PCH_MSI', if_true: files('loongarch_pch_msi.c'))

hw/intc/trace-events

@@ -300,3 +300,6 @@ loongarch_pch_pic_high_readw(unsigned size, uint64_t addr, uint64_t val) "size:
 loongarch_pch_pic_high_writew(unsigned size, uint64_t addr, uint64_t val) "size: %u addr: 0x%"PRIx64 "val: 0x%" PRIx64
 loongarch_pch_pic_readb(unsigned size, uint64_t addr, uint64_t val) "size: %u addr: 0x%"PRIx64 "val: 0x%" PRIx64
 loongarch_pch_pic_writeb(unsigned size, uint64_t addr, uint64_t val) "size: %u addr: 0x%"PRIx64 "val: 0x%" PRIx64
+
+# loongarch_pch_msi.c
+loongarch_msi_set_irq(int irq_num) "set msi irq %d"

hw/loongarch/Kconfig

@@ -4,3 +4,4 @@ config LOONGARCH_VIRT
     select PCI_EXPRESS_GENERIC_BRIDGE
     select LOONGARCH_IPI
     select LOONGARCH_PCH_PIC
+    select LOONGARCH_PCH_MSI

include/hw/intc/loongarch_pch_msi.h

@@ -0,0 +1,20 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+/*
+ * LoongArch 7A1000 I/O interrupt controller definitions
+ *
+ * Copyright (C) 2021 Loongson Technology Corporation Limited
+ */
+
+#define TYPE_LOONGARCH_PCH_MSI "loongarch_pch_msi"
+OBJECT_DECLARE_SIMPLE_TYPE(LoongArchPCHMSI, LOONGARCH_PCH_MSI)
+
+/* Msi irq start start from 64 to 255 */
+#define PCH_MSI_IRQ_START   64
+#define PCH_MSI_IRQ_END     255
+#define PCH_MSI_IRQ_NUM     192
+
+struct LoongArchPCHMSI {
+    SysBusDevice parent_obj;
+    qemu_irq pch_msi_irq[PCH_MSI_IRQ_NUM];
+    MemoryRegion msi_mmio;
+};

include/hw/pci-host/ls7a.h

@@ -15,6 +15,9 @@
 #include "qemu/range.h"
 #include "qom/object.h"
 
+#define LS7A_PCI_MEM_BASE        0x40000000UL
+#define LS7A_PCI_MEM_SIZE        0x40000000UL
+
 #define LS7A_PCH_REG_BASE       0x10000000UL
 #define LS7A_IOAPIC_REG_BASE    (LS7A_PCH_REG_BASE)
 #define LS7A_PCH_MSI_ADDR_LOW   0x2FF00000UL