1/* SPDX-License-Identifier: GPL-2.0 */
2#ifndef __LINUX_MDIO_BITBANG_H
3#define __LINUX_MDIO_BITBANG_H
4
5#include <linux/phy.h>
6
7struct module;
8
9struct mdiobb_ctrl;
10
11struct mdiobb_ops {
12	struct module *owner;
13
14	/* Set the Management Data Clock high if level is one,
15	 * low if level is zero.
16	 */
17	void (*set_mdc)(struct mdiobb_ctrl *ctrl, int level);
18
19	/* Configure the Management Data I/O pin as an input if
20	 * "output" is zero, or an output if "output" is one.
21	 */
22	void (*set_mdio_dir)(struct mdiobb_ctrl *ctrl, int output);
23
24	/* Set the Management Data I/O pin high if value is one,
25	 * low if "value" is zero.  This may only be called
26	 * when the MDIO pin is configured as an output.
27	 */
28	void (*set_mdio_data)(struct mdiobb_ctrl *ctrl, int value);
29
30	/* Retrieve the state Management Data I/O pin. */
31	int (*get_mdio_data)(struct mdiobb_ctrl *ctrl);
32};
33
34struct mdiobb_ctrl {
35	const struct mdiobb_ops *ops;
36	unsigned int override_op_c22;
37	u8 op_c22_read;
38	u8 op_c22_write;
39};
40
41int mdiobb_read_c22(struct mii_bus *bus, int phy, int reg);
42int mdiobb_write_c22(struct mii_bus *bus, int phy, int reg, u16 val);
43int mdiobb_read_c45(struct mii_bus *bus, int devad, int phy, int reg);
44int mdiobb_write_c45(struct mii_bus *bus, int devad, int phy, int reg, u16 val);
45
46/* The returned bus is not yet registered with the phy layer. */
47struct mii_bus *alloc_mdio_bitbang(struct mdiobb_ctrl *ctrl);
48
49/* The bus must already have been unregistered. */
50void free_mdio_bitbang(struct mii_bus *bus);
51
52#endif
53