2 * drivers/net/ibm_newemac/zmii.c
4 * Driver for PowerPC 4xx on-chip ethernet controller, ZMII bridge support.
6 * Copyright 2007 Benjamin Herrenschmidt, IBM Corp.
7 * <benh@kernel.crashing.org>
9 * Based on the arch/ppc version of the driver:
11 * Copyright (c) 2004, 2005 Zultys Technologies.
12 * Eugene Surovegin <eugene.surovegin@zultys.com> or <ebs@ebshome.net>
14 * Based on original work by
15 * Armin Kuster <akuster@mvista.com>
16 * Copyright 2001 MontaVista Softare Inc.
18 * This program is free software; you can redistribute it and/or modify it
19 * under the terms of the GNU General Public License as published by the
20 * Free Software Foundation; either version 2 of the License, or (at your
21 * option) any later version.
24 #include <linux/kernel.h>
25 #include <linux/ethtool.h>
32 #define ZMII_FER_MDI(idx) (0x80000000 >> ((idx) * 4))
33 #define ZMII_FER_MDI_ALL (ZMII_FER_MDI(0) | ZMII_FER_MDI(1) | \
34 ZMII_FER_MDI(2) | ZMII_FER_MDI(3))
36 #define ZMII_FER_SMII(idx) (0x40000000 >> ((idx) * 4))
37 #define ZMII_FER_RMII(idx) (0x20000000 >> ((idx) * 4))
38 #define ZMII_FER_MII(idx) (0x10000000 >> ((idx) * 4))
41 #define ZMII_SSR_SCI(idx) (0x40000000 >> ((idx) * 4))
42 #define ZMII_SSR_FSS(idx) (0x20000000 >> ((idx) * 4))
43 #define ZMII_SSR_SP(idx) (0x10000000 >> ((idx) * 4))
45 /* ZMII only supports MII, RMII and SMII
46 * we also support autodetection for backward compatibility
48 static inline int zmii_valid_mode(int mode)
50 return mode == PHY_MODE_MII ||
51 mode == PHY_MODE_RMII ||
52 mode == PHY_MODE_SMII ||
56 static inline const char *zmii_mode_name(int mode)
70 static inline u32 zmii_mode_mask(int mode, int input)
74 return ZMII_FER_MII(input);
76 return ZMII_FER_RMII(input);
78 return ZMII_FER_SMII(input);
84 int __devinit zmii_attach(struct of_device *ofdev, int input, int *mode)
86 struct zmii_instance *dev = dev_get_drvdata(&ofdev->dev);
87 struct zmii_regs __iomem *p = dev->base;
89 ZMII_DBG(dev, "init(%d, %d)" NL, input, *mode);
91 if (!zmii_valid_mode(*mode)) {
92 /* Probably an EMAC connected to RGMII,
93 * but it still may need ZMII for MDIO so
100 mutex_lock(&dev->lock);
102 /* Autodetect ZMII mode if not specified.
103 * This is only for backward compatibility with the old driver.
104 * Please, always specify PHY mode in your board port to avoid
107 if (dev->mode == PHY_MODE_NA) {
108 if (*mode == PHY_MODE_NA) {
109 u32 r = dev->fer_save;
111 ZMII_DBG(dev, "autodetecting mode, FER = 0x%08x" NL, r);
113 if (r & (ZMII_FER_MII(0) | ZMII_FER_MII(1)))
114 dev->mode = PHY_MODE_MII;
115 else if (r & (ZMII_FER_RMII(0) | ZMII_FER_RMII(1)))
116 dev->mode = PHY_MODE_RMII;
118 dev->mode = PHY_MODE_SMII;
122 printk(KERN_NOTICE "%s: bridge in %s mode\n",
123 ofdev->node->full_name, zmii_mode_name(dev->mode));
125 /* All inputs must use the same mode */
126 if (*mode != PHY_MODE_NA && *mode != dev->mode) {
128 "%s: invalid mode %d specified for input %d\n",
129 ofdev->node->full_name, *mode, input);
130 mutex_unlock(&dev->lock);
135 /* Report back correct PHY mode,
136 * it may be used during PHY initialization.
140 /* Enable this input */
141 out_be32(&p->fer, in_be32(&p->fer) | zmii_mode_mask(dev->mode, input));
144 mutex_unlock(&dev->lock);
149 void zmii_get_mdio(struct of_device *ofdev, int input)
151 struct zmii_instance *dev = dev_get_drvdata(&ofdev->dev);
154 ZMII_DBG2(dev, "get_mdio(%d)" NL, input);
156 mutex_lock(&dev->lock);
158 fer = in_be32(&dev->base->fer) & ~ZMII_FER_MDI_ALL;
159 out_be32(&dev->base->fer, fer | ZMII_FER_MDI(input));
162 void zmii_put_mdio(struct of_device *ofdev, int input)
164 struct zmii_instance *dev = dev_get_drvdata(&ofdev->dev);
166 ZMII_DBG2(dev, "put_mdio(%d)" NL, input);
167 mutex_unlock(&dev->lock);
171 void zmii_set_speed(struct of_device *ofdev, int input, int speed)
173 struct zmii_instance *dev = dev_get_drvdata(&ofdev->dev);
176 mutex_lock(&dev->lock);
178 ssr = in_be32(&dev->base->ssr);
180 ZMII_DBG(dev, "speed(%d, %d)" NL, input, speed);
182 if (speed == SPEED_100)
183 ssr |= ZMII_SSR_SP(input);
185 ssr &= ~ZMII_SSR_SP(input);
187 out_be32(&dev->base->ssr, ssr);
189 mutex_unlock(&dev->lock);
192 void __devexit zmii_detach(struct of_device *ofdev, int input)
194 struct zmii_instance *dev = dev_get_drvdata(&ofdev->dev);
196 BUG_ON(!dev || dev->users == 0);
198 mutex_lock(&dev->lock);
200 ZMII_DBG(dev, "detach(%d)" NL, input);
202 /* Disable this input */
203 out_be32(&dev->base->fer,
204 in_be32(&dev->base->fer) & ~zmii_mode_mask(dev->mode, input));
208 mutex_unlock(&dev->lock);
211 int zmii_get_regs_len(struct of_device *ofdev)
213 return sizeof(struct emac_ethtool_regs_subhdr) +
214 sizeof(struct zmii_regs);
217 void *zmii_dump_regs(struct of_device *ofdev, void *buf)
219 struct zmii_instance *dev = dev_get_drvdata(&ofdev->dev);
220 struct emac_ethtool_regs_subhdr *hdr = buf;
221 struct zmii_regs *regs = (struct zmii_regs *)(hdr + 1);
224 hdr->index = 0; /* for now, are there chips with more than one
225 * zmii ? if yes, then we'll add a cell_index
226 * like we do for emac
228 memcpy_fromio(regs, dev->base, sizeof(struct zmii_regs));
232 static int __devinit zmii_probe(struct of_device *ofdev,
233 const struct of_device_id *match)
235 struct device_node *np = ofdev->node;
236 struct zmii_instance *dev;
237 struct resource regs;
241 dev = kzalloc(sizeof(struct zmii_instance), GFP_KERNEL);
243 printk(KERN_ERR "%s: could not allocate ZMII device!\n",
248 mutex_init(&dev->lock);
250 dev->mode = PHY_MODE_NA;
253 if (of_address_to_resource(np, 0, ®s)) {
254 printk(KERN_ERR "%s: Can't get registers address\n",
260 dev->base = (struct zmii_regs __iomem *)ioremap(regs.start,
261 sizeof(struct zmii_regs));
262 if (dev->base == NULL) {
263 printk(KERN_ERR "%s: Can't map device registers!\n",
268 /* We may need FER value for autodetection later */
269 dev->fer_save = in_be32(&dev->base->fer);
271 /* Disable all inputs by default */
272 out_be32(&dev->base->fer, 0);
275 "ZMII %s initialized\n", ofdev->node->full_name);
277 dev_set_drvdata(&ofdev->dev, dev);
287 static int __devexit zmii_remove(struct of_device *ofdev)
289 struct zmii_instance *dev = dev_get_drvdata(&ofdev->dev);
291 dev_set_drvdata(&ofdev->dev, NULL);
293 WARN_ON(dev->users != 0);
301 static struct of_device_id zmii_match[] =
304 .compatible = "ibm,zmii",
306 /* For backward compat with old DT */
313 static struct of_platform_driver zmii_driver = {
315 .match_table = zmii_match,
318 .remove = zmii_remove,
321 int __init zmii_init(void)
323 return of_register_platform_driver(&zmii_driver);
328 of_unregister_platform_driver(&zmii_driver);