i2c mux support

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

src/drivers/i2c/adm1027/adm1027.c

@@ -0,0 +1,72 @@
+#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 <part/hard_reset.h>
+#include <cpu/x86/msr.h>
+#include "chip.h"
+
+#define ADM1027_REG_CONFIG1 0x40
+#define CFG1_STRT     	0x01
+#define CFG1_LOCK  	0x02
+#define CFG1_RDY	0x04
+#define CFG1_FSPD       0x08
+#define CFG1_VXI	0x10
+#define CFT1_FSPDIS     0x20
+#define CFG1_TODIS     	0x40
+#define CFG1_VCC	0x80
+#define ADM1027_REG_CONFIG2 0x73
+#define ADM1027_REG_CONFIG3 0x78
+
+static void adm1027_enable_monitoring(device_t dev)
+{        
+        int result;
+        result = smbus_read_byte(dev, ADM1027_REG_CONFIG1);
+       
+	if(!(result & CFG1_RDY) ) { 
+		printk_debug("ADM1027: monitoring not ready");
+		return;
+	}
+        result = (result | CFG1_STRT);
+        result = smbus_write_byte(dev, ADM1027_REG_CONFIG1, result);
+        
+        result = smbus_read_byte(dev, ADM1027_REG_CONFIG1);
+        if (!(result & CFG1_STRT)) {
+                printk_debug("ADM1027: monitoring would not enable");
+        }
+}
+
+static void adm1027_init(device_t dev)
+{
+	if (dev->enabled && dev->path.type == DEVICE_PATH_I2C)
+	{
+		if(ops_smbus_bus(get_pbus_smbus(dev))) {
+			if( dev->bus->dev->path.type == DEVICE_PATH_I2C) smbus_set_link(dev); // it is under mux 
+			adm1027_enable_monitoring(dev);
+		}
+		
+	}
+
+}
+static void adm1027_noop(device_t dummy)
+{
+}
+
+static struct device_operations adm1027_operations = {
+        .read_resources   = adm1027_noop,
+        .set_resources    = adm1027_noop,
+        .enable_resources = adm1027_noop,
+        .init             = adm1027_init,
+};
+
+static void enable_dev(struct device *dev)
+{
+	dev->ops = &adm1027_operations;
+}
+
+struct chip_operations drivers_i2c_adm1027_ops = {
+	CHIP_NAME("adm1027")
+	.enable_dev = enable_dev, 
+};