LXR linux/include/linux/mdio-bitbang.h

   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(struct mii_bus *bus, int phy, int reg);
  42int mdiobb_write(struct mii_bus *bus, int phy, int reg, u16 val);
  43
  44/* The returned bus is not yet registered with the phy layer. */
  45struct mii_bus *alloc_mdio_bitbang(struct mdiobb_ctrl *ctrl);
  46
  47/* The bus must already have been unregistered. */
  48void free_mdio_bitbang(struct mii_bus *bus);
  49
  50#endif
  51