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
   7 struct module;
   8
   9 struct mdiobb_ctrl;
  10
  11 struct 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
  34 struct 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
  41 int mdiobb_read(struct mii_bus *bus, int phy, int reg);
  42 int 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. */
  45 struct mii_bus *alloc_mdio_bitbang(struct mdiobb_ctrl *ctrl);
  46
  47 /* The bus must already have been unregistered. */
  48 void free_mdio_bitbang(struct mii_bus *bus);
  49
  50 #endif