2 * drivers/net/ethernet/ibm/emac/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/slab.h>
25 #include <linux/kernel.h>
26 #include <linux/ethtool.h>
27 #include <linux/of_address.h>
33 // XXX FIXME: Axon seems to support a subset of the RGMII, we
34 // thus need to take that into account and possibly change some
35 // of the bit settings below that don't seem to quite match the
39 #define RGMII_FER_MASK(idx) (0x7 << ((idx) * 4))
40 #define RGMII_FER_RTBI(idx) (0x4 << ((idx) * 4))
41 #define RGMII_FER_RGMII(idx) (0x5 << ((idx) * 4))
42 #define RGMII_FER_TBI(idx) (0x6 << ((idx) * 4))
43 #define RGMII_FER_GMII(idx) (0x7 << ((idx) * 4))
44 #define RGMII_FER_MII(idx) RGMII_FER_GMII(idx)
47 #define RGMII_SSR_MASK(idx) (0x7 << ((idx) * 8))
48 #define RGMII_SSR_10(idx) (0x1 << ((idx) * 8))
49 #define RGMII_SSR_100(idx) (0x2 << ((idx) * 8))
50 #define RGMII_SSR_1000(idx) (0x4 << ((idx) * 8))
52 /* RGMII bridge supports only GMII/TBI and RGMII/RTBI PHYs */
53 static inline int rgmii_valid_mode(int phy_mode)
55 return phy_mode == PHY_MODE_GMII ||
56 phy_mode == PHY_MODE_MII ||
57 phy_mode == PHY_MODE_RGMII ||
58 phy_mode == PHY_MODE_TBI ||
59 phy_mode == PHY_MODE_RTBI;
62 static inline const char *rgmii_mode_name(int mode)
80 static inline u32 rgmii_mode_mask(int mode, int input)
84 return RGMII_FER_RGMII(input);
86 return RGMII_FER_TBI(input);
88 return RGMII_FER_GMII(input);
90 return RGMII_FER_MII(input);
92 return RGMII_FER_RTBI(input);
98 int rgmii_attach(struct platform_device *ofdev, int input, int mode)
100 struct rgmii_instance *dev = platform_get_drvdata(ofdev);
101 struct rgmii_regs __iomem *p = dev->base;
103 RGMII_DBG(dev, "attach(%d)" NL, input);
105 /* Check if we need to attach to a RGMII */
106 if (input < 0 || !rgmii_valid_mode(mode)) {
107 printk(KERN_ERR "%s: unsupported settings !\n",
108 ofdev->dev.of_node->full_name);
112 mutex_lock(&dev->lock);
114 /* Enable this input */
115 out_be32(&p->fer, in_be32(&p->fer) | rgmii_mode_mask(mode, input));
117 printk(KERN_NOTICE "%s: input %d in %s mode\n",
118 ofdev->dev.of_node->full_name, input, rgmii_mode_name(mode));
122 mutex_unlock(&dev->lock);
127 void rgmii_set_speed(struct platform_device *ofdev, int input, int speed)
129 struct rgmii_instance *dev = platform_get_drvdata(ofdev);
130 struct rgmii_regs __iomem *p = dev->base;
133 mutex_lock(&dev->lock);
135 ssr = in_be32(&p->ssr) & ~RGMII_SSR_MASK(input);
137 RGMII_DBG(dev, "speed(%d, %d)" NL, input, speed);
139 if (speed == SPEED_1000)
140 ssr |= RGMII_SSR_1000(input);
141 else if (speed == SPEED_100)
142 ssr |= RGMII_SSR_100(input);
143 else if (speed == SPEED_10)
144 ssr |= RGMII_SSR_10(input);
146 out_be32(&p->ssr, ssr);
148 mutex_unlock(&dev->lock);
151 void rgmii_get_mdio(struct platform_device *ofdev, int input)
153 struct rgmii_instance *dev = platform_get_drvdata(ofdev);
154 struct rgmii_regs __iomem *p = dev->base;
157 RGMII_DBG2(dev, "get_mdio(%d)" NL, input);
159 if (!(dev->flags & EMAC_RGMII_FLAG_HAS_MDIO))
162 mutex_lock(&dev->lock);
164 fer = in_be32(&p->fer);
165 fer |= 0x00080000u >> input;
166 out_be32(&p->fer, fer);
167 (void)in_be32(&p->fer);
169 DBG2(dev, " fer = 0x%08x\n", fer);
172 void rgmii_put_mdio(struct platform_device *ofdev, int input)
174 struct rgmii_instance *dev = platform_get_drvdata(ofdev);
175 struct rgmii_regs __iomem *p = dev->base;
178 RGMII_DBG2(dev, "put_mdio(%d)" NL, input);
180 if (!(dev->flags & EMAC_RGMII_FLAG_HAS_MDIO))
183 fer = in_be32(&p->fer);
184 fer &= ~(0x00080000u >> input);
185 out_be32(&p->fer, fer);
186 (void)in_be32(&p->fer);
188 DBG2(dev, " fer = 0x%08x\n", fer);
190 mutex_unlock(&dev->lock);
193 void rgmii_detach(struct platform_device *ofdev, int input)
195 struct rgmii_instance *dev = platform_get_drvdata(ofdev);
196 struct rgmii_regs __iomem *p;
198 BUG_ON(!dev || dev->users == 0);
201 mutex_lock(&dev->lock);
203 RGMII_DBG(dev, "detach(%d)" NL, input);
205 /* Disable this input */
206 out_be32(&p->fer, in_be32(&p->fer) & ~RGMII_FER_MASK(input));
210 mutex_unlock(&dev->lock);
213 int rgmii_get_regs_len(struct platform_device *ofdev)
215 return sizeof(struct emac_ethtool_regs_subhdr) +
216 sizeof(struct rgmii_regs);
219 void *rgmii_dump_regs(struct platform_device *ofdev, void *buf)
221 struct rgmii_instance *dev = platform_get_drvdata(ofdev);
222 struct emac_ethtool_regs_subhdr *hdr = buf;
223 struct rgmii_regs *regs = (struct rgmii_regs *)(hdr + 1);
226 hdr->index = 0; /* for now, are there chips with more than one
227 * rgmii ? if yes, then we'll add a cell_index
228 * like we do for emac
230 memcpy_fromio(regs, dev->base, sizeof(struct rgmii_regs));
235 static int rgmii_probe(struct platform_device *ofdev)
237 struct device_node *np = ofdev->dev.of_node;
238 struct rgmii_instance *dev;
239 struct resource regs;
243 dev = kzalloc(sizeof(struct rgmii_instance), GFP_KERNEL);
247 mutex_init(&dev->lock);
251 if (of_address_to_resource(np, 0, ®s)) {
252 printk(KERN_ERR "%s: Can't get registers address\n",
258 dev->base = (struct rgmii_regs __iomem *)ioremap(regs.start,
259 sizeof(struct rgmii_regs));
260 if (dev->base == NULL) {
261 printk(KERN_ERR "%s: Can't map device registers!\n",
266 /* Check for RGMII flags */
267 if (of_get_property(ofdev->dev.of_node, "has-mdio", NULL))
268 dev->flags |= EMAC_RGMII_FLAG_HAS_MDIO;
270 /* CAB lacks the right properties, fix this up */
271 if (of_device_is_compatible(ofdev->dev.of_node, "ibm,rgmii-axon"))
272 dev->flags |= EMAC_RGMII_FLAG_HAS_MDIO;
274 DBG2(dev, " Boot FER = 0x%08x, SSR = 0x%08x\n",
275 in_be32(&dev->base->fer), in_be32(&dev->base->ssr));
277 /* Disable all inputs by default */
278 out_be32(&dev->base->fer, 0);
281 "RGMII %s initialized with%s MDIO support\n",
282 ofdev->dev.of_node->full_name,
283 (dev->flags & EMAC_RGMII_FLAG_HAS_MDIO) ? "" : "out");
286 platform_set_drvdata(ofdev, dev);
296 static int rgmii_remove(struct platform_device *ofdev)
298 struct rgmii_instance *dev = platform_get_drvdata(ofdev);
300 WARN_ON(dev->users != 0);
308 static const struct of_device_id rgmii_match[] =
311 .compatible = "ibm,rgmii",
314 .type = "emac-rgmii",
319 static struct platform_driver rgmii_driver = {
321 .name = "emac-rgmii",
322 .of_match_table = rgmii_match,
324 .probe = rgmii_probe,
325 .remove = rgmii_remove,
328 int __init rgmii_init(void)
330 return platform_driver_register(&rgmii_driver);
333 void rgmii_exit(void)
335 platform_driver_unregister(&rgmii_driver);