2 * drivers/net/ibm_newemac/rgmii.c
4 * Driver for PowerPC 4xx on-chip ethernet controller, RGMII 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 * Matt Porter <mporter@kernel.crashing.org>
11 * Copyright 2004 MontaVista Software, 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>
26 // XXX FIXME: Axon seems to support a subset of the RGMII, we
27 // thus need to take that into account and possibly change some
28 // of the bit settings below that don't seem to quite match the
32 #define RGMII_FER_MASK(idx) (0x7 << ((idx) * 4))
33 #define RGMII_FER_RTBI(idx) (0x4 << ((idx) * 4))
34 #define RGMII_FER_RGMII(idx) (0x5 << ((idx) * 4))
35 #define RGMII_FER_TBI(idx) (0x6 << ((idx) * 4))
36 #define RGMII_FER_GMII(idx) (0x7 << ((idx) * 4))
39 #define RGMII_SSR_MASK(idx) (0x7 << ((idx) * 8))
40 #define RGMII_SSR_100(idx) (0x2 << ((idx) * 8))
41 #define RGMII_SSR_1000(idx) (0x4 << ((idx) * 8))
43 /* RGMII bridge supports only GMII/TBI and RGMII/RTBI PHYs */
44 static inline int rgmii_valid_mode(int phy_mode)
46 return phy_mode == PHY_MODE_GMII ||
47 phy_mode == PHY_MODE_RGMII ||
48 phy_mode == PHY_MODE_TBI ||
49 phy_mode == PHY_MODE_RTBI;
52 static inline const char *rgmii_mode_name(int mode)
68 static inline u32 rgmii_mode_mask(int mode, int input)
72 return RGMII_FER_RGMII(input);
74 return RGMII_FER_TBI(input);
76 return RGMII_FER_GMII(input);
78 return RGMII_FER_RTBI(input);
84 int __devinit rgmii_attach(struct of_device *ofdev, int input, int mode)
86 struct rgmii_instance *dev = dev_get_drvdata(&ofdev->dev);
87 struct rgmii_regs __iomem *p = dev->base;
89 RGMII_DBG(dev, "attach(%d)" NL, input);
91 /* Check if we need to attach to a RGMII */
92 if (input < 0 || !rgmii_valid_mode(mode)) {
93 printk(KERN_ERR "%s: unsupported settings !\n",
94 ofdev->node->full_name);
98 mutex_lock(&dev->lock);
100 /* Enable this input */
101 out_be32(&p->fer, in_be32(&p->fer) | rgmii_mode_mask(mode, input));
103 printk(KERN_NOTICE "%s: input %d in %s mode\n",
104 ofdev->node->full_name, input, rgmii_mode_name(mode));
108 mutex_unlock(&dev->lock);
113 void rgmii_set_speed(struct of_device *ofdev, int input, int speed)
115 struct rgmii_instance *dev = dev_get_drvdata(&ofdev->dev);
116 struct rgmii_regs __iomem *p = dev->base;
119 mutex_lock(&dev->lock);
121 ssr = in_be32(&p->ssr) & ~RGMII_SSR_MASK(input);
123 RGMII_DBG(dev, "speed(%d, %d)" NL, input, speed);
125 if (speed == SPEED_1000)
126 ssr |= RGMII_SSR_1000(input);
127 else if (speed == SPEED_100)
128 ssr |= RGMII_SSR_100(input);
130 out_be32(&p->ssr, ssr);
132 mutex_unlock(&dev->lock);
135 void rgmii_get_mdio(struct of_device *ofdev, int input)
137 struct rgmii_instance *dev = dev_get_drvdata(&ofdev->dev);
138 struct rgmii_regs __iomem *p = dev->base;
141 RGMII_DBG2(dev, "get_mdio(%d)" NL, input);
143 if (dev->type != RGMII_AXON)
146 mutex_lock(&dev->lock);
148 fer = in_be32(&p->fer);
149 fer |= 0x00080000u >> input;
150 out_be32(&p->fer, fer);
151 (void)in_be32(&p->fer);
153 DBG2(dev, " fer = 0x%08x\n", fer);
156 void rgmii_put_mdio(struct of_device *ofdev, int input)
158 struct rgmii_instance *dev = dev_get_drvdata(&ofdev->dev);
159 struct rgmii_regs __iomem *p = dev->base;
162 RGMII_DBG2(dev, "put_mdio(%d)" NL, input);
164 if (dev->type != RGMII_AXON)
167 fer = in_be32(&p->fer);
168 fer &= ~(0x00080000u >> input);
169 out_be32(&p->fer, fer);
170 (void)in_be32(&p->fer);
172 DBG2(dev, " fer = 0x%08x\n", fer);
174 mutex_unlock(&dev->lock);
177 void __devexit rgmii_detach(struct of_device *ofdev, int input)
179 struct rgmii_instance *dev = dev_get_drvdata(&ofdev->dev);
180 struct rgmii_regs __iomem *p = dev->base;
182 mutex_lock(&dev->lock);
184 BUG_ON(!dev || dev->users == 0);
186 RGMII_DBG(dev, "detach(%d)" NL, input);
188 /* Disable this input */
189 out_be32(&p->fer, in_be32(&p->fer) & ~RGMII_FER_MASK(input));
193 mutex_unlock(&dev->lock);
196 int rgmii_get_regs_len(struct of_device *ofdev)
198 return sizeof(struct emac_ethtool_regs_subhdr) +
199 sizeof(struct rgmii_regs);
202 void *rgmii_dump_regs(struct of_device *ofdev, void *buf)
204 struct rgmii_instance *dev = dev_get_drvdata(&ofdev->dev);
205 struct emac_ethtool_regs_subhdr *hdr = buf;
206 struct rgmii_regs *regs = (struct rgmii_regs *)(hdr + 1);
209 hdr->index = 0; /* for now, are there chips with more than one
210 * rgmii ? if yes, then we'll add a cell_index
211 * like we do for emac
213 memcpy_fromio(regs, dev->base, sizeof(struct rgmii_regs));
218 static int __devinit rgmii_probe(struct of_device *ofdev,
219 const struct of_device_id *match)
221 struct device_node *np = ofdev->node;
222 struct rgmii_instance *dev;
223 struct resource regs;
227 dev = kzalloc(sizeof(struct rgmii_instance), GFP_KERNEL);
229 printk(KERN_ERR "%s: could not allocate RGMII device!\n",
234 mutex_init(&dev->lock);
238 if (of_address_to_resource(np, 0, ®s)) {
239 printk(KERN_ERR "%s: Can't get registers address\n",
245 dev->base = (struct rgmii_regs __iomem *)ioremap(regs.start,
246 sizeof(struct rgmii_regs));
247 if (dev->base == NULL) {
248 printk(KERN_ERR "%s: Can't map device registers!\n",
253 /* Check for RGMII type */
254 if (of_device_is_compatible(ofdev->node, "ibm,rgmii-axon"))
255 dev->type = RGMII_AXON;
257 dev->type = RGMII_STANDARD;
259 DBG2(dev, " Boot FER = 0x%08x, SSR = 0x%08x\n",
260 in_be32(&dev->base->fer), in_be32(&dev->base->ssr));
262 /* Disable all inputs by default */
263 out_be32(&dev->base->fer, 0);
266 "RGMII %s %s initialized\n",
267 dev->type == RGMII_STANDARD ? "standard" : "axon",
268 ofdev->node->full_name);
271 dev_set_drvdata(&ofdev->dev, dev);
281 static int __devexit rgmii_remove(struct of_device *ofdev)
283 struct rgmii_instance *dev = dev_get_drvdata(&ofdev->dev);
285 dev_set_drvdata(&ofdev->dev, NULL);
287 WARN_ON(dev->users != 0);
295 static struct of_device_id rgmii_match[] =
298 .type = "rgmii-interface",
299 .compatible = "ibm,rgmii",
302 .type = "emac-rgmii",
307 static struct of_platform_driver rgmii_driver = {
308 .name = "emac-rgmii",
309 .match_table = rgmii_match,
311 .probe = rgmii_probe,
312 .remove = rgmii_remove,
315 int __init rgmii_init(void)
317 return of_register_platform_driver(&rgmii_driver);
320 void rgmii_exit(void)
322 of_unregister_platform_driver(&rgmii_driver);