Introduce I2C controller support for the AST1040 SoC model.

The I2C model type is selected from the SoC type name, allowing the AST1040
SoC to use the corresponding aspeed.i2c-ast1040 model.

The I2C controller is mapped at 0x74C0F000 and uses IRQs
64 - 77, with one IRQ assigned per I2C bus.

The controller DRAM link is connected to SRAM1 (HyperRAM)
for DMA support.

Signed-off-by: Jamin Lin <jamin_lin@aspeedtech.com>
---
 hw/arm/aspeed_ast1040.c | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)

diff --git a/hw/arm/aspeed_ast1040.c b/hw/arm/aspeed_ast1040.c
index 77211ce1f3..6d1cb9b102 100644
--- a/hw/arm/aspeed_ast1040.c
+++ b/hw/arm/aspeed_ast1040.c
@@ -117,6 +117,7 @@ static void aspeed_soc_ast1040_init(Object *obj)
         object_initialize_child(obj, "sgpio[*]", &s->sgpiom[i],
                                 "aspeed.sgpio-ast2700");
     }
+    object_initialize_child(obj, "i2c", &s->i2c, TYPE_ASPEED_1040_I2C);
 
     object_initialize_child(obj, "pwm", &s->pwm, TYPE_UNIMPLEMENTED_DEVICE);
     object_initialize_child(obj, "espi", &s->espi, TYPE_UNIMPLEMENTED_DEVICE);
@@ -233,6 +234,21 @@ static void aspeed_soc_ast1040_realize(DeviceState *dev_soc, Error **errp)
                        aspeed_soc_ast1040_get_irq(s, ASPEED_DEV_SGPIOM0 + i));
     }
 
+    /* I2C */
+    object_property_set_link(OBJECT(&s->i2c), "dram", OBJECT(&s->sram[1]),
+                             &error_abort);
+    if (!sysbus_realize(SYS_BUS_DEVICE(&s->i2c), errp)) {
+        return;
+    }
+    aspeed_mmio_map(s->memory, SYS_BUS_DEVICE(&s->i2c), 0,
+                    sc->memmap[ASPEED_DEV_I2C]);
+    for (i = 0; i < ASPEED_I2C_GET_CLASS(&s->i2c)->num_busses; i++) {
+        qemu_irq irq = qdev_get_gpio_in(DEVICE(&a->armv7m),
+                                        sc->irqmap[ASPEED_DEV_I2C] + i);
+        /* The AST1040 I2C controller has one IRQ per bus. */
+        sysbus_connect_irq(SYS_BUS_DEVICE(&s->i2c.busses[i]), 0, irq);
+    }
+
     /* Unimplemented peripherals */
     aspeed_mmio_map_unimplemented(s->memory, SYS_BUS_DEVICE(&s->pwm),
                                   "aspeed.pwm",
-- 
2.43.0