device/mdio: Provide helper functions for read and write
This patch provides helper functions to read or write a register via the
MDIO bus. They can be used from drivers to easily access registers on
the MDIO bus.
Change-Id: I293d93435d27269a071b4b9b94a1b55307c575a7
Signed-off-by: Werner Zeh <werner.zeh@siemens.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/69611
Reviewed-by: Angel Pons <th3fanbus@gmail.com>
Reviewed-by: Arthur Heymans <arthur@aheymans.xyz>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
diff --git a/src/device/mdio.c b/src/device/mdio.c
index 9f560e6..39ac40b 100644
--- a/src/device/mdio.c
+++ b/src/device/mdio.c
@@ -1,5 +1,6 @@
/* SPDX-License-Identifier: GPL-2.0-only */
+#include <assert.h>
#include <console/console.h>
#include <device/device.h>
#include <device/mdio.h>
@@ -14,3 +15,26 @@
return dev->ops->ops_mdio;
}
+
+uint16_t mdio_read(struct device *dev, uint8_t offset)
+{
+ const struct mdio_bus_operations *mdio_ops;
+ struct device *parent = dev->bus->dev;
+
+ assert(dev->path.type == DEVICE_PATH_MDIO);
+ mdio_ops = dev_get_mdio_ops(parent);
+ if (!mdio_ops)
+ return 0;
+ return mdio_ops->read(parent, dev->path.mdio.addr, offset);
+}
+void mdio_write(struct device *dev, uint8_t offset, uint16_t val)
+{
+ const struct mdio_bus_operations *mdio_ops;
+ struct device *parent = dev->bus->dev;
+
+ assert(dev->path.type == DEVICE_PATH_MDIO);
+ mdio_ops = dev_get_mdio_ops(parent);
+ if (!mdio_ops)
+ return;
+ mdio_ops->write(parent, dev->path.mdio.addr, offset, val);
+}
diff --git a/src/include/device/mdio.h b/src/include/device/mdio.h
index 39e60f5..44ce48b 100644
--- a/src/include/device/mdio.h
+++ b/src/include/device/mdio.h
@@ -14,4 +14,7 @@
/* Helper for getting mdio operations from a device */
const struct mdio_bus_operations *dev_get_mdio_ops(struct device *dev);
+uint16_t mdio_read(struct device *dev, uint8_t offset);
+void mdio_write(struct device *dev, uint8_t offset, uint16_t val);
+
#endif /* __DEVICE_MDIO_H__ */