2 * drivers/net/ibm_newemac/rgmii.c
4 * Driver for PowerPC 4xx on-chip ethernet controller, RGMII 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 * Matt Porter <mporter@kernel.crashing.org>
16 * Copyright 2004 MontaVista Software, 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>
31 // XXX FIXME: Axon seems to support a subset of the RGMII, we
32 // thus need to take that into account and possibly change some
33 // of the bit settings below that don't seem to quite match the
37 #define RGMII_FER_MASK(idx) (0x7 << ((idx) * 4))
38 #define RGMII_FER_RTBI(idx) (0x4 << ((idx) * 4))
39 #define RGMII_FER_RGMII(idx) (0x5 << ((idx) * 4))
40 #define RGMII_FER_TBI(idx) (0x6 << ((idx) * 4))
41 #define RGMII_FER_GMII(idx) (0x7 << ((idx) * 4))
42 #define RGMII_FER_MII(idx) RGMII_FER_GMII(idx)
45 #define RGMII_SSR_MASK(idx) (0x7 << ((idx) * 8))
46 #define RGMII_SSR_100(idx) (0x2 << ((idx) * 8))
47 #define RGMII_SSR_1000(idx) (0x4 << ((idx) * 8))
49 /* RGMII bridge supports only GMII/TBI and RGMII/RTBI PHYs */
50 static inline int rgmii_valid_mode(int phy_mode)
52 return phy_mode == PHY_MODE_GMII ||
53 phy_mode == PHY_MODE_MII ||
54 phy_mode == PHY_MODE_RGMII ||
55 phy_mode == PHY_MODE_TBI ||
56 phy_mode == PHY_MODE_RTBI;
59 static inline const char *rgmii_mode_name(int mode)
77 static inline u32 rgmii_mode_mask(int mode, int input)
81 return RGMII_FER_RGMII(input);
83 return RGMII_FER_TBI(input);
85 return RGMII_FER_GMII(input);
87 return RGMII_FER_MII(input);
89 return RGMII_FER_RTBI(input);
95 int __devinit rgmii_attach(struct of_device *ofdev, int input, int mode)
97 struct rgmii_instance *dev = dev_get_drvdata(&ofdev->dev);
98 struct rgmii_regs __iomem *p = dev->base;
100 RGMII_DBG(dev, "attach(%d)" NL, input);
102 /* Check if we need to attach to a RGMII */
103 if (input < 0 || !rgmii_valid_mode(mode)) {
104 printk(KERN_ERR "%s: unsupported settings !\n",
105 ofdev->node->full_name);
109 mutex_lock(&dev->lock);
111 /* Enable this input */
112 out_be32(&p->fer, in_be32(&p->fer) | rgmii_mode_mask(mode, input));
114 printk(KERN_NOTICE "%s: input %d in %s mode\n",
115 ofdev->node->full_name, input, rgmii_mode_name(mode));
119 mutex_unlock(&dev->lock);
124 void rgmii_set_speed(struct of_device *ofdev, int input, int speed)
126 struct rgmii_instance *dev = dev_get_drvdata(&ofdev->dev);
127 struct rgmii_regs __iomem *p = dev->base;
130 mutex_lock(&dev->lock);
132 ssr = in_be32(&p->ssr) & ~RGMII_SSR_MASK(input);
134 RGMII_DBG(dev, "speed(%d, %d)" NL, input, speed);
136 if (speed == SPEED_1000)
137 ssr |= RGMII_SSR_1000(input);
138 else if (speed == SPEED_100)
139 ssr |= RGMII_SSR_100(input);
141 out_be32(&p->ssr, ssr);
143 mutex_unlock(&dev->lock);
146 void rgmii_get_mdio(struct of_device *ofdev, int input)
148 struct rgmii_instance *dev = dev_get_drvdata(&ofdev->dev);
149 struct rgmii_regs __iomem *p = dev->base;
152 RGMII_DBG2(dev, "get_mdio(%d)" NL, input);
154 if (!(dev->flags & EMAC_RGMII_FLAG_HAS_MDIO))
157 mutex_lock(&dev->lock);
159 fer = in_be32(&p->fer);
160 fer |= 0x00080000u >> input;
161 out_be32(&p->fer, fer);
162 (void)in_be32(&p->fer);
164 DBG2(dev, " fer = 0x%08x\n", fer);
167 void rgmii_put_mdio(struct of_device *ofdev, int input)
169 struct rgmii_instance *dev = dev_get_drvdata(&ofdev->dev);
170 struct rgmii_regs __iomem *p = dev->base;
173 RGMII_DBG2(dev, "put_mdio(%d)" NL, input);
175 if (!(dev->flags & EMAC_RGMII_FLAG_HAS_MDIO))
178 fer = in_be32(&p->fer);
179 fer &= ~(0x00080000u >> input);
180 out_be32(&p->fer, fer);
181 (void)in_be32(&p->fer);
183 DBG2(dev, " fer = 0x%08x\n", fer);
185 mutex_unlock(&dev->lock);
188 void rgmii_detach(struct of_device *ofdev, int input)
190 struct rgmii_instance *dev = dev_get_drvdata(&ofdev->dev);
191 struct rgmii_regs __iomem *p = dev->base;
193 mutex_lock(&dev->lock);
195 BUG_ON(!dev || dev->users == 0);
197 RGMII_DBG(dev, "detach(%d)" NL, input);
199 /* Disable this input */
200 out_be32(&p->fer, in_be32(&p->fer) & ~RGMII_FER_MASK(input));
204 mutex_unlock(&dev->lock);
207 int rgmii_get_regs_len(struct of_device *ofdev)
209 return sizeof(struct emac_ethtool_regs_subhdr) +
210 sizeof(struct rgmii_regs);
213 void *rgmii_dump_regs(struct of_device *ofdev, void *buf)
215 struct rgmii_instance *dev = dev_get_drvdata(&ofdev->dev);
216 struct emac_ethtool_regs_subhdr *hdr = buf;
217 struct rgmii_regs *regs = (struct rgmii_regs *)(hdr + 1);
220 hdr->index = 0; /* for now, are there chips with more than one
221 * rgmii ? if yes, then we'll add a cell_index
222 * like we do for emac
224 memcpy_fromio(regs, dev->base, sizeof(struct rgmii_regs));
229 static int __devinit rgmii_probe(struct of_device *ofdev,
230 const struct of_device_id *match)
232 struct device_node *np = ofdev->node;
233 struct rgmii_instance *dev;
234 struct resource regs;
238 dev = kzalloc(sizeof(struct rgmii_instance), GFP_KERNEL);
240 printk(KERN_ERR "%s: could not allocate RGMII device!\n",
245 mutex_init(&dev->lock);
249 if (of_address_to_resource(np, 0, ®s)) {
250 printk(KERN_ERR "%s: Can't get registers address\n",
256 dev->base = (struct rgmii_regs __iomem *)ioremap(regs.start,
257 sizeof(struct rgmii_regs));
258 if (dev->base == NULL) {
259 printk(KERN_ERR "%s: Can't map device registers!\n",
264 /* Check for RGMII flags */
265 if (of_get_property(ofdev->node, "has-mdio", NULL))
266 dev->flags |= EMAC_RGMII_FLAG_HAS_MDIO;
268 /* CAB lacks the right properties, fix this up */
269 if (of_device_is_compatible(ofdev->node, "ibm,rgmii-axon"))
270 dev->flags |= EMAC_RGMII_FLAG_HAS_MDIO;
272 DBG2(dev, " Boot FER = 0x%08x, SSR = 0x%08x\n",
273 in_be32(&dev->base->fer), in_be32(&dev->base->ssr));
275 /* Disable all inputs by default */
276 out_be32(&dev->base->fer, 0);
279 "RGMII %s initialized with%s MDIO support\n",
280 ofdev->node->full_name,
281 (dev->flags & EMAC_RGMII_FLAG_HAS_MDIO) ? "" : "out");
284 dev_set_drvdata(&ofdev->dev, dev);
294 static int __devexit rgmii_remove(struct of_device *ofdev)
296 struct rgmii_instance *dev = dev_get_drvdata(&ofdev->dev);
298 dev_set_drvdata(&ofdev->dev, NULL);
300 WARN_ON(dev->users != 0);
308 static struct of_device_id rgmii_match[] =
311 .compatible = "ibm,rgmii",
314 .type = "emac-rgmii",
319 static struct of_platform_driver rgmii_driver = {
320 .name = "emac-rgmii",
321 .match_table = rgmii_match,
323 .probe = rgmii_probe,
324 .remove = rgmii_remove,
327 int __init rgmii_init(void)
329 return of_register_platform_driver(&rgmii_driver);
332 void rgmii_exit(void)
334 of_unregister_platform_driver(&rgmii_driver);