hw/loongarch: Add LoongArch ipi interrupt support(IPI)

This patch realize the IPI 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: <20220606124333.2060567-32-yangxiaojuan@loongson.cn>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>

2 files changed, 54 insertions, 0 deletions

diff --git a/include/hw/intc/loongarch_ipi.h b/include/hw/intc/loongarch_ipi.h
new file mode 100644
index 0000000000..996ed7ea93
--- /dev/null
+++ b/include/hw/intc/loongarch_ipi.h
@@ -0,0 +1,52 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+/*
+ * LoongArch ipi interrupt header files
+ *
+ * Copyright (C) 2021 Loongson Technology Corporation Limited
+ */
+
+#ifndef HW_LOONGARCH_IPI_H
+#define HW_LOONGARCH_IPI_H
+
+#include "hw/sysbus.h"
+
+/* Mainy used by iocsr read and write */
+#define SMP_IPI_MAILBOX      0x1000ULL
+#define CORE_STATUS_OFF       0x0
+#define CORE_EN_OFF           0x4
+#define CORE_SET_OFF          0x8
+#define CORE_CLEAR_OFF        0xc
+#define CORE_BUF_20           0x20
+#define CORE_BUF_28           0x28
+#define CORE_BUF_30           0x30
+#define CORE_BUF_38           0x38
+#define IOCSR_IPI_SEND        0x40
+#define IOCSR_MAIL_SEND       0x48
+#define IOCSR_ANY_SEND        0x158
+
+/* IPI system memory address */
+#define IPI_SYSTEM_MEM        0x1fe01000
+
+#define MAX_IPI_CORE_NUM      4
+#define MAX_IPI_MBX_NUM       4
+
+#define TYPE_LOONGARCH_IPI "loongarch_ipi"
+OBJECT_DECLARE_SIMPLE_TYPE(LoongArchIPI, LOONGARCH_IPI)
+
+typedef struct IPICore {
+    uint32_t status;
+    uint32_t en;
+    uint32_t set;
+    uint32_t clear;
+    /* 64bit buf divide into 2 32bit buf */
+    uint32_t buf[MAX_IPI_MBX_NUM * 2];
+    qemu_irq irq;
+} IPICore;
+
+struct LoongArchIPI {
+    SysBusDevice parent_obj;
+    MemoryRegion ipi_iocsr_mem[MAX_IPI_CORE_NUM];
+    MemoryRegion ipi_system_mem[MAX_IPI_CORE_NUM];
+};
+
+#endif
diff --git a/include/hw/loongarch/virt.h b/include/hw/loongarch/virt.h
index 4a4bb3f51f..09a816191c 100644
--- a/include/hw/loongarch/virt.h
+++ b/include/hw/loongarch/virt.h
@@ -11,6 +11,7 @@
 #include "target/loongarch/cpu.h"
 #include "hw/boards.h"
 #include "qemu/queue.h"
+#include "hw/intc/loongarch_ipi.h"
 
 #define LOONGARCH_MAX_VCPUS     4
 
@@ -21,6 +22,7 @@ struct LoongArchMachineState {
     /*< private >*/
     MachineState parent_obj;
 
+    IPICore ipi_core[MAX_IPI_CORE_NUM];
     MemoryRegion lowmem;
     MemoryRegion highmem;
     MemoryRegion isa_io;