i2c mux support

git-svn-id: svn://svn.coreboot.org/coreboot/trunk@1809 2b7e53f0-3cfb-0310-b3e9-8179ed1497e1

1 files changed, 44 insertions, 0 deletions

diff --git a/src/drivers/i2c/i2cmux/i2cmux.c b/src/drivers/i2c/i2cmux/i2cmux.c
new file mode 100644
index 0000000000..512b19f48a
--- /dev/null
+++ b/src/drivers/i2c/i2cmux/i2cmux.c
@@ -0,0 +1,44 @@
+#include <console/console.h>
+#include <device/device.h>
+#include <device/smbus.h>
+#include <device/pci.h>
+#include <device/pci_ids.h>
+#include <device/pci_ops.h>
+#include <cpu/x86/msr.h>
+#include "chip.h"
+
+static void i2cmux_set_link(device_t dev, unsigned int link)
+{
+	if (dev->enabled && dev->path.type == DEVICE_PATH_I2C)
+	{
+		if(ops_smbus_bus(get_pbus_smbus(dev))) {
+			smbus_write_byte(dev, 0x01, 1<<link); // output value
+			smbus_write_byte(dev, 0x03, 0); // all output
+		}
+		
+	}
+
+}
+static void i2cmux_noop(device_t dummy)
+{
+}
+
+static struct device_operations i2cmux_operations = {
+        .read_resources   = i2cmux_noop,
+        .set_resources    = i2cmux_noop,
+        .enable_resources = i2cmux_noop,
+        .init             = i2cmux_noop,
+	.scan_bus         = scan_static_bus,
+	.set_link	  = i2cmux_set_link,
+};
+
+static void enable_dev(struct device *dev)
+{
+	if(dev->links>0)
+		dev->ops = &i2cmux_operations;
+}
+
+struct chip_operations drivers_i2c_i2cmux_ops = {
+	CHIP_NAME("i2cmux")
+	.enable_dev = enable_dev, 
+};