1 /* SPDX-License-Identifier: GPL-2.0-or-later */
2 /*
3  * drivers/net/ethernet/ibm/emac/zmii.h
4  *
5  * Driver for PowerPC 4xx on-chip ethernet controller, ZMII bridge support.
6  *
7  * Copyright 2007 Benjamin Herrenschmidt, IBM Corp.
8  *                <benh@kernel.crashing.org>
9  *
10  * Based on the arch/ppc version of the driver:
11  *
12  * Copyright (c) 2004, 2005 Zultys Technologies.
13  * Eugene Surovegin <eugene.surovegin@zultys.com> or <ebs@ebshome.net>
14  *
15  * Based on original work by
16  *      Armin Kuster <akuster@mvista.com>
17  * 	Copyright 2001 MontaVista Softare Inc.
18  */
19 #ifndef __IBM_NEWEMAC_ZMII_H
20 #define __IBM_NEWEMAC_ZMII_H
21 
22 /* ZMII bridge registers */
23 struct zmii_regs {
24 	u32 fer;		/* Function enable reg */
25 	u32 ssr;		/* Speed select reg */
26 	u32 smiirs;		/* SMII status reg */
27 };
28 
29 /* ZMII device */
30 struct zmii_instance {
31 	struct zmii_regs __iomem	*base;
32 
33 	/* Only one EMAC whacks us at a time */
34 	struct mutex			lock;
35 
36 	/* subset of PHY_MODE_XXXX */
37 	int				mode;
38 
39 	/* number of EMACs using this ZMII bridge */
40 	int				users;
41 
42 	/* FER value left by firmware */
43 	u32				fer_save;
44 
45 	/* OF device instance */
46 	struct platform_device		*ofdev;
47 };
48 
49 #ifdef CONFIG_IBM_EMAC_ZMII
50 
51 int zmii_init(void);
52 void zmii_exit(void);
53 int zmii_attach(struct platform_device *ofdev, int input,
54 		phy_interface_t *mode);
55 void zmii_detach(struct platform_device *ofdev, int input);
56 void zmii_get_mdio(struct platform_device *ofdev, int input);
57 void zmii_put_mdio(struct platform_device *ofdev, int input);
58 void zmii_set_speed(struct platform_device *ofdev, int input, int speed);
59 int zmii_get_regs_len(struct platform_device *ocpdev);
60 void *zmii_dump_regs(struct platform_device *ofdev, void *buf);
61 
62 #else
63 # define zmii_init()		0
64 # define zmii_exit()		do { } while(0)
65 # define zmii_attach(x,y,z)	(-ENXIO)
66 # define zmii_detach(x,y)	do { } while(0)
67 # define zmii_get_mdio(x,y)	do { } while(0)
68 # define zmii_put_mdio(x,y)	do { } while(0)
69 # define zmii_set_speed(x,y,z)	do { } while(0)
70 # define zmii_get_regs_len(x)	0
71 # define zmii_dump_regs(x,buf)	(buf)
72 #endif				/* !CONFIG_IBM_EMAC_ZMII */
73 
74 #endif /* __IBM_NEWEMAC_ZMII_H */
75