2 * drivers/net/ibm_newemac/zmii.c
4 * Driver for PowerPC 4xx on-chip ethernet controller, ZMII bridge support.
6 * Copyright (c) 2004, 2005 Zultys Technologies.
7 * Eugene Surovegin <eugene.surovegin@zultys.com> or <ebs@ebshome.net>
9 * Based on original work by
10 * Armin Kuster <akuster@mvista.com>
11 * Copyright 2001 MontaVista Softare Inc.
13 * This program is free software; you can redistribute it and/or modify it
14 * under the terms of the GNU General Public License as published by the
15 * Free Software Foundation; either version 2 of the License, or (at your
16 * option) any later version.
19 #include <linux/kernel.h>
20 #include <linux/ethtool.h>
27 #define ZMII_FER_MDI(idx) (0x80000000 >> ((idx) * 4))
28 #define ZMII_FER_MDI_ALL (ZMII_FER_MDI(0) | ZMII_FER_MDI(1) | \
29 ZMII_FER_MDI(2) | ZMII_FER_MDI(3))
31 #define ZMII_FER_SMII(idx) (0x40000000 >> ((idx) * 4))
32 #define ZMII_FER_RMII(idx) (0x20000000 >> ((idx) * 4))
33 #define ZMII_FER_MII(idx) (0x10000000 >> ((idx) * 4))
36 #define ZMII_SSR_SCI(idx) (0x40000000 >> ((idx) * 4))
37 #define ZMII_SSR_FSS(idx) (0x20000000 >> ((idx) * 4))
38 #define ZMII_SSR_SP(idx) (0x10000000 >> ((idx) * 4))
40 /* ZMII only supports MII, RMII and SMII
41 * we also support autodetection for backward compatibility
43 static inline int zmii_valid_mode(int mode
)
45 return mode
== PHY_MODE_MII
||
46 mode
== PHY_MODE_RMII
||
47 mode
== PHY_MODE_SMII
||
51 static inline const char *zmii_mode_name(int mode
)
65 static inline u32
zmii_mode_mask(int mode
, int input
)
69 return ZMII_FER_MII(input
);
71 return ZMII_FER_RMII(input
);
73 return ZMII_FER_SMII(input
);
79 int __devinit
zmii_attach(struct of_device
*ofdev
, int input
, int *mode
)
81 struct zmii_instance
*dev
= dev_get_drvdata(&ofdev
->dev
);
82 struct zmii_regs __iomem
*p
= dev
->base
;
84 ZMII_DBG(dev
, "init(%d, %d)" NL
, input
, *mode
);
86 if (!zmii_valid_mode(*mode
)) {
87 /* Probably an EMAC connected to RGMII,
88 * but it still may need ZMII for MDIO so
95 mutex_lock(&dev
->lock
);
97 /* Autodetect ZMII mode if not specified.
98 * This is only for backward compatibility with the old driver.
99 * Please, always specify PHY mode in your board port to avoid
102 if (dev
->mode
== PHY_MODE_NA
) {
103 if (*mode
== PHY_MODE_NA
) {
104 u32 r
= dev
->fer_save
;
106 ZMII_DBG(dev
, "autodetecting mode, FER = 0x%08x" NL
, r
);
108 if (r
& (ZMII_FER_MII(0) | ZMII_FER_MII(1)))
109 dev
->mode
= PHY_MODE_MII
;
110 else if (r
& (ZMII_FER_RMII(0) | ZMII_FER_RMII(1)))
111 dev
->mode
= PHY_MODE_RMII
;
113 dev
->mode
= PHY_MODE_SMII
;
117 printk(KERN_NOTICE
"%s: bridge in %s mode\n",
118 ofdev
->node
->full_name
, zmii_mode_name(dev
->mode
));
120 /* All inputs must use the same mode */
121 if (*mode
!= PHY_MODE_NA
&& *mode
!= dev
->mode
) {
123 "%s: invalid mode %d specified for input %d\n",
124 ofdev
->node
->full_name
, *mode
, input
);
125 mutex_unlock(&dev
->lock
);
130 /* Report back correct PHY mode,
131 * it may be used during PHY initialization.
135 /* Enable this input */
136 out_be32(&p
->fer
, in_be32(&p
->fer
) | zmii_mode_mask(dev
->mode
, input
));
139 mutex_unlock(&dev
->lock
);
144 void zmii_get_mdio(struct of_device
*ofdev
, int input
)
146 struct zmii_instance
*dev
= dev_get_drvdata(&ofdev
->dev
);
149 ZMII_DBG2(dev
, "get_mdio(%d)" NL
, input
);
151 mutex_lock(&dev
->lock
);
153 fer
= in_be32(&dev
->base
->fer
) & ~ZMII_FER_MDI_ALL
;
154 out_be32(&dev
->base
->fer
, fer
| ZMII_FER_MDI(input
));
157 void zmii_put_mdio(struct of_device
*ofdev
, int input
)
159 struct zmii_instance
*dev
= dev_get_drvdata(&ofdev
->dev
);
161 ZMII_DBG2(dev
, "put_mdio(%d)" NL
, input
);
162 mutex_unlock(&dev
->lock
);
166 void zmii_set_speed(struct of_device
*ofdev
, int input
, int speed
)
168 struct zmii_instance
*dev
= dev_get_drvdata(&ofdev
->dev
);
171 mutex_lock(&dev
->lock
);
173 ssr
= in_be32(&dev
->base
->ssr
);
175 ZMII_DBG(dev
, "speed(%d, %d)" NL
, input
, speed
);
177 if (speed
== SPEED_100
)
178 ssr
|= ZMII_SSR_SP(input
);
180 ssr
&= ~ZMII_SSR_SP(input
);
182 out_be32(&dev
->base
->ssr
, ssr
);
184 mutex_unlock(&dev
->lock
);
187 void __devexit
zmii_detach(struct of_device
*ofdev
, int input
)
189 struct zmii_instance
*dev
= dev_get_drvdata(&ofdev
->dev
);
191 BUG_ON(!dev
|| dev
->users
== 0);
193 mutex_lock(&dev
->lock
);
195 ZMII_DBG(dev
, "detach(%d)" NL
, input
);
197 /* Disable this input */
198 out_be32(&dev
->base
->fer
,
199 in_be32(&dev
->base
->fer
) & ~zmii_mode_mask(dev
->mode
, input
));
203 mutex_unlock(&dev
->lock
);
206 int zmii_get_regs_len(struct of_device
*ofdev
)
208 return sizeof(struct emac_ethtool_regs_subhdr
) +
209 sizeof(struct zmii_regs
);
212 void *zmii_dump_regs(struct of_device
*ofdev
, void *buf
)
214 struct zmii_instance
*dev
= dev_get_drvdata(&ofdev
->dev
);
215 struct emac_ethtool_regs_subhdr
*hdr
= buf
;
216 struct zmii_regs
*regs
= (struct zmii_regs
*)(hdr
+ 1);
219 hdr
->index
= 0; /* for now, are there chips with more than one
220 * zmii ? if yes, then we'll add a cell_index
221 * like we do for emac
223 memcpy_fromio(regs
, dev
->base
, sizeof(struct zmii_regs
));
227 static int __devinit
zmii_probe(struct of_device
*ofdev
,
228 const struct of_device_id
*match
)
230 struct device_node
*np
= ofdev
->node
;
231 struct zmii_instance
*dev
;
232 struct resource regs
;
236 dev
= kzalloc(sizeof(struct zmii_instance
), GFP_KERNEL
);
238 printk(KERN_ERR
"%s: could not allocate ZMII device!\n",
243 mutex_init(&dev
->lock
);
245 dev
->mode
= PHY_MODE_NA
;
248 if (of_address_to_resource(np
, 0, ®s
)) {
249 printk(KERN_ERR
"%s: Can't get registers address\n",
255 dev
->base
= (struct zmii_regs __iomem
*)ioremap(regs
.start
,
256 sizeof(struct zmii_regs
));
257 if (dev
->base
== NULL
) {
258 printk(KERN_ERR
"%s: Can't map device registers!\n",
263 /* We may need FER value for autodetection later */
264 dev
->fer_save
= in_be32(&dev
->base
->fer
);
266 /* Disable all inputs by default */
267 out_be32(&dev
->base
->fer
, 0);
270 "ZMII %s initialized\n", ofdev
->node
->full_name
);
272 dev_set_drvdata(&ofdev
->dev
, dev
);
282 static int __devexit
zmii_remove(struct of_device
*ofdev
)
284 struct zmii_instance
*dev
= dev_get_drvdata(&ofdev
->dev
);
286 dev_set_drvdata(&ofdev
->dev
, NULL
);
288 WARN_ON(dev
->users
!= 0);
296 static struct of_device_id zmii_match
[] =
299 .compatible
= "ibm,zmii",
301 /* For backward compat with old DT */
308 static struct of_platform_driver zmii_driver
= {
310 .match_table
= zmii_match
,
313 .remove
= zmii_remove
,
316 int __init
zmii_init(void)
318 return of_register_platform_driver(&zmii_driver
);
323 of_unregister_platform_driver(&zmii_driver
);