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Generic bitbanged MDIO library

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Previously, bitbanged MDIO was only supported in individual
hardware-specific drivers.  This code factors out the higher level
protocol implementation, reducing the hardware-specific portion to
functions setting direction, data, and clock.

Signed-off-by: Scott Wood <scottwood@freescale.com>
Signed-off-by: Jeff Garzik <jeff@garzik.org>
This commit is contained in:
Scott Wood 2007-10-01 14:20:56 -05:00 • committed by David S. Miller
parent 976de6a8c3
commit e2ec4581ad
4 changed files with 239 additions and 0 deletions
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42
include/linux/mdio-bitbang.h Normal file
View file

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#ifndef __LINUX_MDIO_BITBANG_H
#define __LINUX_MDIO_BITBANG_H
#include <linux/phy.h>
#include <linux/module.h>
struct mdiobb_ctrl;
struct mdiobb_ops {
struct module *owner;
/* Set the Management Data Clock high if level is one,
* low if level is zero.
*/
void (*set_mdc)(struct mdiobb_ctrl *ctrl, int level);
/* Configure the Management Data I/O pin as an input if
* "output" is zero, or an output if "output" is one.
*/
void (*set_mdio_dir)(struct mdiobb_ctrl *ctrl, int output);
/* Set the Management Data I/O pin high if value is one,
* low if "value" is zero. This may only be called
* when the MDIO pin is configured as an output.
*/
void (*set_mdio_data)(struct mdiobb_ctrl *ctrl, int value);
/* Retrieve the state Management Data I/O pin. */
int (*get_mdio_data)(struct mdiobb_ctrl *ctrl);
};
struct mdiobb_ctrl {
const struct mdiobb_ops *ops;
};
/* The returned bus is not yet registered with the phy layer. */
struct mii_bus *alloc_mdio_bitbang(struct mdiobb_ctrl *ctrl);
/* The bus must already have been unregistered. */
void free_mdio_bitbang(struct mii_bus *bus);
#endif