include/device: Split i2c.h into three

Split `i2c.h` into three pieces to ease reuse of the generic defi-
nitions. No code is changed.

* `i2c.h`        - keeps the generic definitions
* `i2c_simple.h` - holds the current, limited to one controller driver
                   per board, devicetree independent I2C interface
* `i2c_bus.h`    - will become the devicetree compatible interface for
                   native I2C (e.g. non-SMBus) controllers

Change-Id: I382d45c70f9314588663e1284f264f877469c74d
Signed-off-by: Nico Huber <nico.huber@secunet.com>
Reviewed-on: https://review.coreboot.org/20845
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Aaron Durbin <adurbin@chromium.org>

1 files changed, 44 insertions, 0 deletions

diff --git a/src/include/device/i2c_bus.h b/src/include/device/i2c_bus.h
new file mode 100644
index 000000000000..474d9e5b2c06
--- /dev/null
+++ b/src/include/device/i2c_bus.h
@@ -0,0 +1,44 @@
+/*
+ * This file is part of the coreboot project.
+ *
+ * Copyright (C) 2014 Google, Inc.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; version 2 of the License.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+#ifndef _DEVICE_I2C_BUS_H_
+#define _DEVICE_I2C_BUS_H_
+
+#include <stdint.h>
+#include <device/i2c.h>
+#include <device/device.h>
+
+/* I2C bus operation for ramstage drivers */
+struct i2c_bus_operations {
+	/*
+	 * This is an SOC specific method that can be provided to translate the
+	 * 'struct device' for an I2C controller into a unique I2C bus number.
+	 * Returns -1 if the bus number for this device cannot be determined.
+	 */
+	int (*dev_to_bus)(struct device *dev);
+};
+
+/* Return I2C bus number for provided device, -1 if not found */
+int i2c_dev_find_bus(struct device *dev);
+
+/* Variants of I2C helper functions that take a device instead of bus number */
+int i2c_dev_transfer(struct device *dev, struct i2c_msg *segments, int count);
+int i2c_dev_readb(struct device *dev, uint8_t reg, uint8_t *data);
+int i2c_dev_writeb(struct device *dev, uint8_t reg, uint8_t data);
+int i2c_dev_read_bytes(struct device *dev, uint8_t reg, uint8_t *data, int len);
+int i2c_dev_read_raw(struct device *dev, uint8_t *data, int len);
+int i2c_dev_write_raw(struct device *dev, uint8_t *data, int len);
+
+#endif	/* _DEVICE_I2C_BUS_H_ */