ARM RealView I2C
Add ARM Realview I2C host emulation.
Signed-off-by: Paul Brook <paul@codesourcery.com>
diff --git a/hw/realview.c b/hw/realview.c
index 7aa127e..f0b8347 100644
--- a/hw/realview.c
+++ b/hw/realview.c
@@ -15,8 +15,86 @@
#include "net.h"
#include "sysemu.h"
#include "boards.h"
+#include "bitbang_i2c.h"
+#include "sysbus.h"
#define SMP_BOOT_ADDR 0xe0000000
+
+typedef struct {
+ SysBusDevice busdev;
+ bitbang_i2c_interface *bitbang;
+ int out;
+ int in;
+} RealViewI2CState;
+
+static uint32_t realview_i2c_read(void *opaque, target_phys_addr_t offset)
+{
+ RealViewI2CState *s = (RealViewI2CState *)opaque;
+
+ if (offset == 0) {
+ return (s->out & 1) | (s->in << 1);
+ } else {
+ hw_error("realview_i2c_read: Bad offset 0x%x\n", (int)offset);
+ return -1;
+ }
+}
+
+static void realview_i2c_write(void *opaque, target_phys_addr_t offset,
+ uint32_t value)
+{
+ RealViewI2CState *s = (RealViewI2CState *)opaque;
+
+ switch (offset) {
+ case 0:
+ s->out |= value & 3;
+ break;
+ case 4:
+ s->out &= ~value;
+ break;
+ default:
+ hw_error("realview_i2c_write: Bad offset 0x%x\n", (int)offset);
+ }
+ bitbang_i2c_set(s->bitbang, BITBANG_I2C_SCL, (s->out & 1) != 0);
+ s->in = bitbang_i2c_set(s->bitbang, BITBANG_I2C_SDA, (s->out & 2) != 0);
+}
+
+static CPUReadMemoryFunc * const realview_i2c_readfn[] = {
+ realview_i2c_read,
+ realview_i2c_read,
+ realview_i2c_read
+};
+
+static CPUWriteMemoryFunc * const realview_i2c_writefn[] = {
+ realview_i2c_write,
+ realview_i2c_write,
+ realview_i2c_write
+};
+
+static int realview_i2c_init(SysBusDevice *dev)
+{
+ RealViewI2CState *s = FROM_SYSBUS(RealViewI2CState, dev);
+ i2c_bus *bus;
+ int iomemtype;
+
+ bus = i2c_init_bus(&dev->qdev, "i2c");
+ s->bitbang = bitbang_i2c_init(bus);
+ iomemtype = cpu_register_io_memory(realview_i2c_readfn,
+ realview_i2c_writefn, s);
+ sysbus_init_mmio(dev, 0x1000, iomemtype);
+ return 0;
+}
+
+static SysBusDeviceInfo realview_i2c_info = {
+ .init = realview_i2c_init,
+ .qdev.name = "realview_i2c",
+ .qdev.size = sizeof(RealViewI2CState),
+};
+
+static void realview_register_devices(void)
+{
+ sysbus_register_withprop(&realview_i2c_info);
+}
+
/* Board init. */
static struct arm_boot_info realview_binfo = {
@@ -63,6 +141,7 @@
qemu_irq pic[64];
PCIBus *pci_bus;
NICInfo *nd;
+ i2c_bus *i2c;
int n;
int done_nic = 0;
qemu_irq cpu_irq[4];
@@ -202,10 +281,14 @@
}
}
+ dev = sysbus_create_simple("realview_i2c", 0x10002000, NULL);
+ i2c = (i2c_bus *)qdev_get_child_bus(dev, "i2c");
+ i2c_create_slave(i2c, "ds1338", 0x68);
+
/* Memory map for RealView Emulation Baseboard: */
/* 0x10000000 System registers. */
/* 0x10001000 System controller. */
- /* 0x10002000 Two-Wire Serial Bus. */
+ /* 0x10002000 Two-Wire Serial Bus. */
/* 0x10003000 Reserved. */
/* 0x10004000 AACI. */
/* 0x10005000 MCI. */
@@ -362,3 +445,4 @@
}
machine_init(realview_machine_init);
+device_init(realview_register_devices)
