Add I2C model for AST2700 I2C support.
The I2C controller registers base address is start at
0x14C0_F000 and its address space is 0x2000.

The AST2700 I2C controller has one source INTC per bus.
I2C buses interrupt are connected to GICINT130_INTC
from bit 0 to bit 15.
I2C bus 0 is connected to GICINT130_INTC at bit 0.
I2C bus 15 is connected to GICINT130_INTC at bit 15.

Signed-off-by: Jamin Lin <jamin_lin@aspeedtech.com>
---
 hw/arm/aspeed_ast27x0.c | 27 +++++++++++++++++++++++++++
 1 file changed, 27 insertions(+)

diff --git a/hw/arm/aspeed_ast27x0.c b/hw/arm/aspeed_ast27x0.c
index 0bbd66110b..e84141c13b 100644
--- a/hw/arm/aspeed_ast27x0.c
+++ b/hw/arm/aspeed_ast27x0.c
@@ -61,6 +61,7 @@ static const hwaddr aspeed_soc_ast2700_memmap[] = {
     [ASPEED_GIC_DIST]      =  0x12200000,
     [ASPEED_GIC_REDIST]    =  0x12280000,
     [ASPEED_DEV_ADC]       =  0x14C00000,
+    [ASPEED_DEV_I2C]       =  0x14C0F000,
 };
 
 #define AST2700_MAX_IRQ 288
@@ -374,6 +375,9 @@ static void aspeed_soc_ast2700_init(Object *obj)
 
     snprintf(typename, sizeof(typename), "aspeed.adc-%s", socname);
     object_initialize_child(obj, "adc", &s->adc, typename);
+
+    snprintf(typename, sizeof(typename), "aspeed.i2c-%s", socname);
+    object_initialize_child(obj, "i2c", &s->i2c, typename);
 }
 
 /*
@@ -457,6 +461,8 @@ static void aspeed_soc_ast2700_realize(DeviceState *dev, Error **errp)
     AspeedSoCClass *sc = ASPEED_SOC_GET_CLASS(s);
     AspeedINTCClass *ic = ASPEED_INTC_GET_CLASS(&a->intc);
     g_autofree char *sram_name = NULL;
+    qemu_irq irq;
+    struct gic_intc_orgate_info orgate_info;
 
     /* Default boot region (SPI memory or ROMs) */
     memory_region_init(&s->spi_boot_container, OBJECT(s),
@@ -639,6 +645,27 @@ static void aspeed_soc_ast2700_realize(DeviceState *dev, Error **errp)
     sysbus_connect_irq(SYS_BUS_DEVICE(&s->adc), 0,
                        aspeed_soc_get_irq(s, ASPEED_DEV_ADC));
 
+    /* I2C */
+    object_property_set_link(OBJECT(&s->i2c), "dram", OBJECT(s->dram_mr),
+                             &error_abort);
+    if (!sysbus_realize(SYS_BUS_DEVICE(&s->i2c), errp)) {
+        return;
+    }
+    aspeed_mmio_map(s, SYS_BUS_DEVICE(&s->i2c), 0, sc->memmap[ASPEED_DEV_I2C]);
+    aspeed_soc_ast2700_get_intc_orgate(s, ASPEED_DEV_I2C, &orgate_info);
+    for (i = 0; i < ASPEED_I2C_GET_CLASS(&s->i2c)->num_busses; i++) {
+        /*
+         * The AST2700 I2C controller has one source INTC per bus.
+         * I2C buses interrupt are connected to GICINT130_INTC
+         * from bit 0 to bit 15.
+         * I2C bus 0 is connected to GICINT130_INTC at bit 0.
+         * I2C bus 15 is connected to GICINT130_INTC at bit 15.
+         */
+        irq = qdev_get_gpio_in(DEVICE(&a->intc.orgates[orgate_info.index]),
+                               orgate_info.int_num + i);
+        sysbus_connect_irq(SYS_BUS_DEVICE(&s->i2c.busses[i]), 0, irq);
+    }
+
     create_unimplemented_device("ast2700.dpmcu", 0x11000000, 0x40000);
     create_unimplemented_device("ast2700.iomem0", 0x12000000, 0x01000000);
     create_unimplemented_device("ast2700.iomem1", 0x14000000, 0x01000000);
-- 
2.34.1