[PATCH v4 2/3] hw/intc/loongarch_pch_pic: add irq number property

[Tianrui Zhao]

With loongarch 7A1000 manual, irq number supported can be set
in PCH_PIC_INT_ID_HI register. This patch adds irq number property
for loongarch_pch_pic, so that virt machine can set different
irq number when pch_pic intc is added.

Signed-off-by: Tianrui Zhao <zhaotianrui@loongson.cn>
---
 hw/intc/loongarch_pch_pic.c         | 33 +++++++++++++++++++++++++----
 hw/loongarch/virt.c                 |  8 ++++---
 include/hw/intc/loongarch_pch_pic.h |  5 ++---
 3 files changed, 36 insertions(+), 10 deletions(-)

diff --git a/hw/intc/loongarch_pch_pic.c b/hw/intc/loongarch_pch_pic.c
index 3380b09807..1440195837 100644
--- a/hw/intc/loongarch_pch_pic.c
+++ b/hw/intc/loongarch_pch_pic.c
@@ -10,8 +10,10 @@
 #include "hw/loongarch/virt.h"
 #include "hw/irq.h"
 #include "hw/intc/loongarch_pch_pic.h"
+#include "hw/qdev-properties.h"
 #include "migration/vmstate.h"
 #include "trace.h"
+#include "qapi/error.h"
 
 static void pch_pic_update_irq(LoongArchPCHPIC *s, uint64_t mask, int level)
 {
@@ -40,7 +42,7 @@ static void pch_pic_irq_handler(void *opaque, int irq, int 
level)
     LoongArchPCHPIC *s = LOONGARCH_PCH_PIC(opaque);
     uint64_t mask = 1ULL << irq;
 
-    assert(irq < PCH_PIC_IRQ_NUM);
+    assert(irq < s->irq_num);
     trace_loongarch_pch_pic_irq_handler(irq, level);
 
     if (s->intedge & mask) {
@@ -78,7 +80,12 @@ static uint64_t loongarch_pch_pic_low_readw(void *opaque, 
hwaddr addr,
         val = PCH_PIC_INT_ID_VAL;
         break;
     case PCH_PIC_INT_ID_HI:
-        val = PCH_PIC_INT_ID_NUM;
+        /*
+         * With 7A1000 manual
+         *   bit  0-15 pch irqchip version
+         *   bit 16-31 irq number supported with pch irqchip
+         */
+        val = PCH_PIC_INT_ID_VER + ((s->irq_num - 1) << 16);
         break;
     case PCH_PIC_INT_MASK_LO:
         val = (uint32_t)s->int_mask;
@@ -365,6 +372,19 @@ static void loongarch_pch_pic_reset(DeviceState *d)
     s->int_polarity = 0x0;
 }
 
+static void loongarch_pch_pic_realize(DeviceState *dev, Error **errp)
+{
+    LoongArchPCHPIC *s = LOONGARCH_PCH_PIC(dev);
+
+    if (!s->irq_num || s->irq_num  > PCH_PIC_IRQ_NUM) {
+        error_setg(errp, "Invalid 'pic_irq_num'");
+        return;
+    }
+
+    qdev_init_gpio_out(dev, s->parent_irq, s->irq_num);
+    qdev_init_gpio_in(dev, pch_pic_irq_handler, s->irq_num);
+}
+
 static void loongarch_pch_pic_init(Object *obj)
 {
     LoongArchPCHPIC *s = LOONGARCH_PCH_PIC(obj);
@@ -382,10 +402,13 @@ static void loongarch_pch_pic_init(Object *obj)
     sysbus_init_mmio(sbd, &s->iomem8);
     sysbus_init_mmio(sbd, &s->iomem32_high);
 
-    qdev_init_gpio_out(DEVICE(obj), s->parent_irq, PCH_PIC_IRQ_NUM);
-    qdev_init_gpio_in(DEVICE(obj), pch_pic_irq_handler, PCH_PIC_IRQ_NUM);
 }
 
+static Property loongarch_pch_pic_properties[] = {
+    DEFINE_PROP_UINT32("pch_pic_irq_num",  LoongArchPCHPIC, irq_num, 0),
+    DEFINE_PROP_END_OF_LIST(),
+};
+
 static const VMStateDescription vmstate_loongarch_pch_pic = {
     .name = TYPE_LOONGARCH_PCH_PIC,
     .version_id = 1,
@@ -411,8 +434,10 @@ static void loongarch_pch_pic_class_init(ObjectClass 
*klass, void *data)
 {
     DeviceClass *dc = DEVICE_CLASS(klass);
 
+    dc->realize = loongarch_pch_pic_realize;
     dc->reset = loongarch_pch_pic_reset;
     dc->vmsd = &vmstate_loongarch_pch_pic;
+    device_class_set_props(dc, loongarch_pch_pic_properties);
 }
 
 static const TypeInfo loongarch_pch_pic_info = {
diff --git a/hw/loongarch/virt.c b/hw/loongarch/virt.c
index 1e58346aeb..a39704e1e7 100644
--- a/hw/loongarch/virt.c
+++ b/hw/loongarch/virt.c
@@ -559,6 +559,8 @@ static void loongarch_irq_init(LoongArchMachineState *lams)
     }
 
     pch_pic = qdev_new(TYPE_LOONGARCH_PCH_PIC);
+    num = PCH_PIC_IRQ_NUM;
+    qdev_prop_set_uint32(pch_pic, "pch_pic_irq_num", num);
     d = SYS_BUS_DEVICE(pch_pic);
     sysbus_realize_and_unref(d, &error_fatal);
     memory_region_add_subregion(get_system_memory(), VIRT_IOAPIC_REG_BASE,
@@ -570,13 +572,13 @@ static void loongarch_irq_init(LoongArchMachineState 
*lams)
                             VIRT_IOAPIC_REG_BASE + PCH_PIC_INT_STATUS_LO,
                             sysbus_mmio_get_region(d, 2));
 
-    /* Connect 64 pch_pic irqs to extioi */
-    for (int i = 0; i < PCH_PIC_IRQ_NUM; i++) {
+    /* Connect pch_pic irqs to extioi */
+    for (int i = 0; i < num; i++) {
         qdev_connect_gpio_out(DEVICE(d), i, qdev_get_gpio_in(extioi, i));
     }
 
     pch_msi = qdev_new(TYPE_LOONGARCH_PCH_MSI);
-    start   =  PCH_PIC_IRQ_NUM;
+    start   =  num;
     num = EXTIOI_IRQS - start;
     qdev_prop_set_uint32(pch_msi, "msi_irq_base", start);
     qdev_prop_set_uint32(pch_msi, "msi_irq_num", num);
diff --git a/include/hw/intc/loongarch_pch_pic.h 
b/include/hw/intc/loongarch_pch_pic.h
index 2d4aa9ed6f..ba3a47fa88 100644
--- a/include/hw/intc/loongarch_pch_pic.h
+++ b/include/hw/intc/loongarch_pch_pic.h
@@ -9,11 +9,9 @@
 #define PCH_PIC_NAME(name) TYPE_LOONGARCH_PCH_PIC#name
 OBJECT_DECLARE_SIMPLE_TYPE(LoongArchPCHPIC, LOONGARCH_PCH_PIC)
 
-#define PCH_PIC_IRQ_START               0
-#define PCH_PIC_IRQ_END                 63
 #define PCH_PIC_IRQ_NUM                 64
 #define PCH_PIC_INT_ID_VAL              0x7000000UL
-#define PCH_PIC_INT_ID_NUM              0x3f0001UL
+#define PCH_PIC_INT_ID_VER              0x1UL
 
 #define PCH_PIC_INT_ID_LO               0x00
 #define PCH_PIC_INT_ID_HI               0x04
@@ -66,4 +64,5 @@ struct LoongArchPCHPIC {
     MemoryRegion iomem32_low;
     MemoryRegion iomem32_high;
     MemoryRegion iomem8;
+    unsigned int  irq_num;
 };
-- 
2.31.1