Reinvent I2C ops

Do not use the global platform_i2c_transfer() function that can only be
implemented by a single driver. Instead, make a `struct device` aware
transfer() function the only interface function for I2C controller dri-
vers to implement.

To not force the slave device drivers to be implemented either above
generic I2C or specialized SMBus operations, we support SMBus control-
lers in the slave device interface too.

We start with four simple slave functions: i2c_readb(), i2c_writeb(),
i2c_readb_at() and i2c_writeb_at(). They are all compatible to respec-
tive SMBus functions. But we keep aliases because it would be weird to
force e.g. an I2C EEPROM driver to call smbus_read_byte().

Change-Id: I98386f91bf4799ba3df84ec8bc0f64edd4142818
Signed-off-by: Nico Huber <nico.huber@secunet.com>
Reviewed-on: https://review.coreboot.org/20846
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Aaron Durbin <adurbin@chromium.org>
Reviewed-by: Kyösti Mälkki <kyosti.malkki@gmail.com>

1 files changed, 0 insertions, 83 deletions

diff --git a/src/device/i2c.c b/src/device/i2c.c
index 6fdd5cff26..aa695caf03 100644
--- a/src/device/i2c.c
+++ b/src/device/i2c.c
@@ -13,92 +13,9 @@
  * GNU General Public License for more details.
  */
 
-#include <device/device.h>
-#include <device/i2c_bus.h>
 #include <device/i2c_simple.h>
 #include <stdint.h>
 
-#if ENV_RAMSTAGE
-/* Return I2C operations for a bus */
-static inline const struct i2c_bus_operations *ops_i2c_bus(struct bus *bus)
-{
-	if (bus && bus->dev && bus->dev->ops)
-		return bus->dev->ops->ops_i2c_bus;
-	return NULL;
-}
-
-int i2c_dev_find_bus(struct device *dev)
-{
-	const struct i2c_bus_operations *ops;
-	struct bus *pbus;
-
-	if (!dev)
-		return -1;
-
-	/* Locate parent bus with I2C controller ops */
-	pbus = dev->bus;
-	while (pbus && pbus->dev && !ops_i2c_bus(pbus))
-		if (pbus->dev->bus != pbus)
-			pbus = pbus->dev->bus;
-
-	/* Check if this I2C controller ops implements dev_to_bus() */
-	ops = ops_i2c_bus(pbus);
-	if (!ops || !ops->dev_to_bus)
-		return -1;
-
-	/* Use controller ops to determine the bus number */
-	return ops->dev_to_bus(pbus->dev);
-}
-
-int i2c_dev_transfer(struct device *dev, struct i2c_msg *segments, int count)
-{
-	int bus = i2c_dev_find_bus(dev);
-	if (bus < 0)
-		return -1;
-	return i2c_transfer(bus, segments, count);
-}
-
-int i2c_dev_readb(struct device *dev, uint8_t reg, uint8_t *data)
-{
-	int bus = i2c_dev_find_bus(dev);
-	if (bus < 0)
-		return -1;
-	return i2c_readb(bus, dev->path.i2c.device, reg, data);
-}
-
-int i2c_dev_writeb(struct device *dev, uint8_t reg, uint8_t data)
-{
-	int bus = i2c_dev_find_bus(dev);
-	if (bus < 0)
-		return -1;
-	return i2c_writeb(bus, dev->path.i2c.device, reg, data);
-}
-
-int i2c_dev_read_bytes(struct device *dev, uint8_t reg, uint8_t *data, int len)
-{
-	int bus = i2c_dev_find_bus(dev);
-	if (bus < 0)
-		return -1;
-	return i2c_read_bytes(bus, dev->path.i2c.device, reg, data, len);
-}
-
-int i2c_dev_read_raw(struct device *dev, uint8_t *data, int len)
-{
-	int bus = i2c_dev_find_bus(dev);
-	if (bus < 0)
-		return -1;
-	return i2c_read_raw(bus, dev->path.i2c.device, data, len);
-}
-
-int i2c_dev_write_raw(struct device *dev, uint8_t *data, int len)
-{
-	int bus = i2c_dev_find_bus(dev);
-	if (bus < 0)
-		return -1;
-	return i2c_write_raw(bus, dev->path.i2c.device, data, len);
-}
-#endif
-
 int i2c_read_field(unsigned bus, uint8_t chip, uint8_t reg, uint8_t *data,
 		   uint8_t mask, uint8_t shift)
 {