fdt adds pch pic controller, we use 'loongson,pch-pic-1.0'

See:
https://github.com/torvalds/linux/blob/v6.7/drivers/irqchip/irq-loongson-pch-pic.c
https://lore.kernel.org/r/20200528152757.1028711-4-jiaxun.yang@flygoat.com

Signed-off-by: Song Gao <gaosong@loongson.cn>
Reviewed-by: Bibo Mao <maobibo@loongson.cn>
Message-Id: <20240307164835.300412-13-gaosong@loongson.cn>
---
 include/hw/pci-host/ls7a.h |  1 +
 hw/loongarch/virt.c        | 30 +++++++++++++++++++++++++++++-
 2 files changed, 30 insertions(+), 1 deletion(-)

diff --git a/include/hw/pci-host/ls7a.h b/include/hw/pci-host/ls7a.h
index e753449593..fe260f0183 100644
--- a/include/hw/pci-host/ls7a.h
+++ b/include/hw/pci-host/ls7a.h
@@ -24,6 +24,7 @@
 #define VIRT_PCH_REG_BASE        0x10000000UL
 #define VIRT_IOAPIC_REG_BASE     (VIRT_PCH_REG_BASE)
 #define VIRT_PCH_MSI_ADDR_LOW    0x2FF00000UL
+#define VIRT_PCH_REG_SIZE        0x400
 
 /*
  * GSI_BASE is hard-coded with 64 in linux kernel, else kernel fails to boot
diff --git a/hw/loongarch/virt.c b/hw/loongarch/virt.c
index 094b9d2e60..5bef161d11 100644
--- a/hw/loongarch/virt.c
+++ b/hw/loongarch/virt.c
@@ -148,6 +148,31 @@ static void fdt_add_eiointc_node(LoongArchMachineState *lams,
     g_free(nodename);
 }
 
+static void fdt_add_pch_pic_node(LoongArchMachineState *lams,
+                                 uint32_t *eiointc_phandle,
+                                 uint32_t *pch_pic_phandle)
+{
+    MachineState *ms = MACHINE(lams);
+    char *nodename;
+    hwaddr pch_pic_base = VIRT_PCH_REG_BASE;
+    hwaddr pch_pic_size = VIRT_PCH_REG_SIZE;
+
+    *pch_pic_phandle = qemu_fdt_alloc_phandle(ms->fdt);
+    nodename = g_strdup_printf("/platic@%" PRIx64, pch_pic_base);
+    qemu_fdt_add_subnode(ms->fdt, nodename);
+    qemu_fdt_setprop_cell(ms->fdt,  nodename, "phandle", *pch_pic_phandle);
+    qemu_fdt_setprop_string(ms->fdt, nodename, "compatible",
+                            "loongson,pch-pic-1.0");
+    qemu_fdt_setprop_cells(ms->fdt, nodename, "reg", 0,
+                           pch_pic_base, 0, pch_pic_size);
+    qemu_fdt_setprop(ms->fdt, nodename, "interrupt-controller", NULL, 0);
+    qemu_fdt_setprop_cell(ms->fdt, nodename, "#interrupt-cells", 2);
+    qemu_fdt_setprop_cell(ms->fdt, nodename, "interrupt-parent",
+                          *eiointc_phandle);
+    qemu_fdt_setprop_cell(ms->fdt, nodename, "loongson,pic-base-vec", 0);
+    g_free(nodename);
+}
+
 static void fdt_add_flash_node(LoongArchMachineState *lams)
 {
     MachineState *ms = MACHINE(lams);
@@ -570,7 +595,7 @@ static void loongarch_irq_init(LoongArchMachineState *lams)
     CPULoongArchState *env;
     CPUState *cpu_state;
     int cpu, pin, i, start, num;
-    uint32_t cpuintc_phandle, eiointc_phandle;
+    uint32_t cpuintc_phandle, eiointc_phandle, pch_pic_phandle;
 
     /*
      * The connection of interrupts:
@@ -661,6 +686,9 @@ static void loongarch_irq_init(LoongArchMachineState *lams)
         qdev_connect_gpio_out(DEVICE(d), i, qdev_get_gpio_in(extioi, i));
     }
 
+    /* Add PCH PIC node */
+    fdt_add_pch_pic_node(lams, &eiointc_phandle, &pch_pic_phandle);
+
     pch_msi = qdev_new(TYPE_LOONGARCH_PCH_MSI);
     start   =  num;
     num = EXTIOI_IRQS - start;
-- 
2.25.1