/* SPDX-License-Identifier: GPL-2.0-or-later */
/*
 * drivers/net/ethernet/ibm/emac/rgmii.h
 *
 * Driver for PowerPC 4xx on-chip ethernet controller, RGMII bridge support.
 *
 * Copyright 2007 Benjamin Herrenschmidt, IBM Corp.
 *                <benh@kernel.crashing.org>
 *
 * Based on the arch/ppc version of the driver:
 *
 * Based on ocp_zmii.h/ibm_emac_zmii.h
 * Armin Kuster akuster@mvista.com
 *
 * Copyright 2004 MontaVista Software, Inc.
 * Matt Porter <mporter@kernel.crashing.org>
 *
 * Copyright (c) 2004, 2005 Zultys Technologies.
 * Eugene Surovegin <eugene.surovegin@zultys.com> or <ebs@ebshome.net>
 */

#ifndef __IBM_NEWEMAC_RGMII_H
#define __IBM_NEWEMAC_RGMII_H

/* RGMII bridge type */
#define RGMII_STANDARD          0
#define RGMII_AXON              1

/* RGMII bridge */
struct rgmii_regs {
        u32 fer;                /* Function enable register */
        u32 ssr;                /* Speed select register */
};

/* RGMII device */
struct rgmii_instance {
        struct rgmii_regs __iomem       *base;

        /* RGMII bridge flags */
        int                             flags;
#define EMAC_RGMII_FLAG_HAS_MDIO        0x00000001

        /* Only one EMAC whacks us at a time */
        struct mutex                    lock;

        /* number of EMACs using this RGMII bridge */
        int                             users;

        /* OF device instance */
        struct platform_device          *ofdev;
};

#ifdef CONFIG_IBM_EMAC_RGMII

int rgmii_init(void);
void rgmii_exit(void);
int rgmii_attach(struct platform_device *ofdev, int input, int mode);
void rgmii_detach(struct platform_device *ofdev, int input);
void rgmii_get_mdio(struct platform_device *ofdev, int input);
void rgmii_put_mdio(struct platform_device *ofdev, int input);
void rgmii_set_speed(struct platform_device *ofdev, int input, int speed);
int rgmii_get_regs_len(struct platform_device *ofdev);
void *rgmii_dump_regs(struct platform_device *ofdev, void *buf);

#else

# define rgmii_init()           0
# define rgmii_exit()           do { } while(0)
# define rgmii_attach(x,y,z)    (-ENXIO)
# define rgmii_detach(x,y)      do { } while(0)
# define rgmii_get_mdio(o,i)    do { } while (0)
# define rgmii_put_mdio(o,i)    do { } while (0)
# define rgmii_set_speed(x,y,z) do { } while(0)
# define rgmii_get_regs_len(x)  0
# define rgmii_dump_regs(x,buf) (buf)
#endif                          /* !CONFIG_IBM_EMAC_RGMII */

#endif /* __IBM_NEWEMAC_RGMII_H */