i2c mux support

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

1 files changed, 93 insertions, 0 deletions

diff --git a/src/devices/smbus_ops.c b/src/devices/smbus_ops.c
new file mode 100644
index 0000000000..e721bfbfb3
--- /dev/null
+++ b/src/devices/smbus_ops.c
@@ -0,0 +1,93 @@
+#include <console/console.h>
+#include <stdint.h>
+#include <device/device.h>
+#include <device/path.h>
+#include <device/smbus.h>
+
+struct bus *get_pbus_smbus(device_t dev)
+{
+	struct bus *pbus = dev->bus;
+	while(pbus && pbus->dev && !ops_smbus_bus(pbus)) {
+		pbus = pbus->dev->bus;
+	}
+	if (!pbus || !pbus->dev || !pbus->dev->ops || !pbus->dev->ops->ops_smbus_bus) {
+		printk_alert("%s Cannot find smbus bus operations", dev_path(dev));
+		die("");
+		for(;;);
+	}
+	return pbus;
+}
+
+	/*multi level i2c MUX??? may need to find the first i2c device and then set link down to current dev
+                 1 store get_pbus_smbus list link
+                 2 reverse the link and call set link */
+
+int smbus_set_link(device_t dev)
+{
+	struct bus *pbus_a[4]; // 4 level mux only. Enough?
+        struct bus *pbus = dev->bus;
+	int pbus_num=0;
+	int i;
+        while(pbus && pbus->dev && (pbus->dev->path.type==DEVICE_PATH_I2C)) {
+		pbus_a[pbus_num++] = pbus;
+                pbus = pbus->dev->bus;
+        }
+//	printk_info("smbus_set_link: ");
+	for(i=pbus_num-1; i>=0; i--) {
+//		printk_info(" %s[%d] -> ", dev_path(pbus_a[i]->dev), pbus_a[i]->link);
+        	if(ops_smbus_bus(get_pbus_smbus(pbus_a[i]->dev))) {
+                	if(pbus_a[i]->dev->ops && pbus_a[i]->dev->ops->set_link)
+                        	pbus_a[i]->dev->ops->set_link(pbus_a[i]->dev, pbus_a[i]->link);
+		}
+	}
+//	printk_info(" %s\n", dev_path(dev));
+
+        return pbus_num;
+}
+
+int smbus_quick_read(device_t dev)
+{
+	return ops_smbus_bus(get_pbus_smbus(dev))->quick_read(dev);
+}
+int smbus_quick_write(device_t dev)
+{
+	return ops_smbus_bus(get_pbus_smbus(dev))->quick_write(dev);
+}
+int smbus_recv_byte(device_t dev)
+{
+	return ops_smbus_bus(get_pbus_smbus(dev))->recv_byte(dev);
+}
+int smbus_send_byte(device_t dev, uint8_t byte)
+{
+	return ops_smbus_bus(get_pbus_smbus(dev))->send_byte(dev, byte);
+}
+int smbus_read_byte(device_t dev, uint8_t addr)
+{
+	return ops_smbus_bus(get_pbus_smbus(dev))->read_byte(dev, addr);
+}
+int smbus_write_byte(device_t dev, uint8_t addr, uint8_t val)
+{
+	return ops_smbus_bus(get_pbus_smbus(dev))->write_byte(dev, addr, val);
+}
+int smbus_read_word(device_t dev, uint8_t addr)
+{
+	return ops_smbus_bus(get_pbus_smbus(dev))->read_word(dev, addr);
+}
+int smbus_write_word(device_t dev, uint8_t addr, uint16_t val)
+{
+	return ops_smbus_bus(get_pbus_smbus(dev))->write_word(dev, addr, val);
+}
+int smbus_process_call(device_t dev, uint8_t cmd, uint16_t data)
+{
+	return ops_smbus_bus(get_pbus_smbus(dev))->process_call(dev, cmd, data);
+}
+int smbus_block_read(device_t dev, uint8_t cmd, uint8_t bytes, uint8_t *buffer)
+{
+	return ops_smbus_bus(get_pbus_smbus(dev))->block_read(dev, cmd, bytes, buffer);
+}
+int smbus_block_write(device_t dev, uint8_t cmd, uint8_t bytes, const uint8_t *buffer)
+{
+	return ops_smbus_bus(get_pbus_smbus(dev))->block_write(dev, cmd, bytes, buffer);
+}
+
+