blob: 9bc1132fa788572148119390ff16c7ed076d6bf4 [file] [log] [blame]
David Gibson1d3bb992007-08-23 13:56:01 +10001/*
2 * drivers/net/ibm_newemac/rgmii.c
3 *
4 * Driver for PowerPC 4xx on-chip ethernet controller, RGMII bridge support.
5 *
Benjamin Herrenschmidt17cf8032007-12-05 11:14:33 +11006 * Copyright 2007 Benjamin Herrenschmidt, IBM Corp.
7 * <benh@kernel.crashing.org>
8 *
9 * Based on the arch/ppc version of the driver:
10 *
David Gibson1d3bb992007-08-23 13:56:01 +100011 * Copyright (c) 2004, 2005 Zultys Technologies.
12 * Eugene Surovegin <eugene.surovegin@zultys.com> or <ebs@ebshome.net>
13 *
14 * Based on original work by
15 * Matt Porter <mporter@kernel.crashing.org>
16 * Copyright 2004 MontaVista Software, Inc.
17 *
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.
22 *
23 */
24#include <linux/kernel.h>
25#include <linux/ethtool.h>
26#include <asm/io.h>
27
28#include "emac.h"
29#include "debug.h"
30
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
34// AXON spec
35
36/* RGMIIx_FER */
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
43/* RGMIIx_SSR */
44#define RGMII_SSR_MASK(idx) (0x7 << ((idx) * 8))
45#define RGMII_SSR_100(idx) (0x2 << ((idx) * 8))
46#define RGMII_SSR_1000(idx) (0x4 << ((idx) * 8))
47
48/* RGMII bridge supports only GMII/TBI and RGMII/RTBI PHYs */
49static inline int rgmii_valid_mode(int phy_mode)
50{
51 return phy_mode == PHY_MODE_GMII ||
52 phy_mode == PHY_MODE_RGMII ||
53 phy_mode == PHY_MODE_TBI ||
54 phy_mode == PHY_MODE_RTBI;
55}
56
57static inline const char *rgmii_mode_name(int mode)
58{
59 switch (mode) {
60 case PHY_MODE_RGMII:
61 return "RGMII";
62 case PHY_MODE_TBI:
63 return "TBI";
64 case PHY_MODE_GMII:
65 return "GMII";
66 case PHY_MODE_RTBI:
67 return "RTBI";
68 default:
69 BUG();
70 }
71}
72
73static inline u32 rgmii_mode_mask(int mode, int input)
74{
75 switch (mode) {
76 case PHY_MODE_RGMII:
77 return RGMII_FER_RGMII(input);
78 case PHY_MODE_TBI:
79 return RGMII_FER_TBI(input);
80 case PHY_MODE_GMII:
81 return RGMII_FER_GMII(input);
82 case PHY_MODE_RTBI:
83 return RGMII_FER_RTBI(input);
84 default:
85 BUG();
86 }
87}
88
89int __devinit rgmii_attach(struct of_device *ofdev, int input, int mode)
90{
91 struct rgmii_instance *dev = dev_get_drvdata(&ofdev->dev);
Al Viroeb4d84f2007-10-14 19:36:10 +010092 struct rgmii_regs __iomem *p = dev->base;
David Gibson1d3bb992007-08-23 13:56:01 +100093
94 RGMII_DBG(dev, "attach(%d)" NL, input);
95
96 /* Check if we need to attach to a RGMII */
97 if (input < 0 || !rgmii_valid_mode(mode)) {
98 printk(KERN_ERR "%s: unsupported settings !\n",
99 ofdev->node->full_name);
100 return -ENODEV;
101 }
102
103 mutex_lock(&dev->lock);
104
105 /* Enable this input */
106 out_be32(&p->fer, in_be32(&p->fer) | rgmii_mode_mask(mode, input));
107
108 printk(KERN_NOTICE "%s: input %d in %s mode\n",
109 ofdev->node->full_name, input, rgmii_mode_name(mode));
110
111 ++dev->users;
112
113 mutex_unlock(&dev->lock);
114
115 return 0;
116}
117
118void rgmii_set_speed(struct of_device *ofdev, int input, int speed)
119{
120 struct rgmii_instance *dev = dev_get_drvdata(&ofdev->dev);
Al Viroeb4d84f2007-10-14 19:36:10 +0100121 struct rgmii_regs __iomem *p = dev->base;
David Gibson1d3bb992007-08-23 13:56:01 +1000122 u32 ssr;
123
124 mutex_lock(&dev->lock);
125
126 ssr = in_be32(&p->ssr) & ~RGMII_SSR_MASK(input);
127
128 RGMII_DBG(dev, "speed(%d, %d)" NL, input, speed);
129
130 if (speed == SPEED_1000)
131 ssr |= RGMII_SSR_1000(input);
132 else if (speed == SPEED_100)
133 ssr |= RGMII_SSR_100(input);
134
135 out_be32(&p->ssr, ssr);
136
137 mutex_unlock(&dev->lock);
138}
139
140void rgmii_get_mdio(struct of_device *ofdev, int input)
141{
142 struct rgmii_instance *dev = dev_get_drvdata(&ofdev->dev);
Al Viroeb4d84f2007-10-14 19:36:10 +0100143 struct rgmii_regs __iomem *p = dev->base;
David Gibson1d3bb992007-08-23 13:56:01 +1000144 u32 fer;
145
146 RGMII_DBG2(dev, "get_mdio(%d)" NL, input);
147
Benjamin Herrenschmidt1f578772007-12-05 11:14:28 +1100148 if (!(dev->flags & EMAC_RGMII_FLAG_HAS_MDIO))
David Gibson1d3bb992007-08-23 13:56:01 +1000149 return;
150
151 mutex_lock(&dev->lock);
152
153 fer = in_be32(&p->fer);
154 fer |= 0x00080000u >> input;
155 out_be32(&p->fer, fer);
156 (void)in_be32(&p->fer);
157
158 DBG2(dev, " fer = 0x%08x\n", fer);
159}
160
161void rgmii_put_mdio(struct of_device *ofdev, int input)
162{
163 struct rgmii_instance *dev = dev_get_drvdata(&ofdev->dev);
Al Viroeb4d84f2007-10-14 19:36:10 +0100164 struct rgmii_regs __iomem *p = dev->base;
David Gibson1d3bb992007-08-23 13:56:01 +1000165 u32 fer;
166
167 RGMII_DBG2(dev, "put_mdio(%d)" NL, input);
168
Benjamin Herrenschmidt1f578772007-12-05 11:14:28 +1100169 if (!(dev->flags & EMAC_RGMII_FLAG_HAS_MDIO))
David Gibson1d3bb992007-08-23 13:56:01 +1000170 return;
171
172 fer = in_be32(&p->fer);
173 fer &= ~(0x00080000u >> input);
174 out_be32(&p->fer, fer);
175 (void)in_be32(&p->fer);
176
177 DBG2(dev, " fer = 0x%08x\n", fer);
178
179 mutex_unlock(&dev->lock);
180}
181
182void __devexit rgmii_detach(struct of_device *ofdev, int input)
183{
184 struct rgmii_instance *dev = dev_get_drvdata(&ofdev->dev);
Al Viroeb4d84f2007-10-14 19:36:10 +0100185 struct rgmii_regs __iomem *p = dev->base;
David Gibson1d3bb992007-08-23 13:56:01 +1000186
187 mutex_lock(&dev->lock);
188
189 BUG_ON(!dev || dev->users == 0);
190
191 RGMII_DBG(dev, "detach(%d)" NL, input);
192
193 /* Disable this input */
194 out_be32(&p->fer, in_be32(&p->fer) & ~RGMII_FER_MASK(input));
195
196 --dev->users;
197
198 mutex_unlock(&dev->lock);
199}
200
201int rgmii_get_regs_len(struct of_device *ofdev)
202{
203 return sizeof(struct emac_ethtool_regs_subhdr) +
204 sizeof(struct rgmii_regs);
205}
206
207void *rgmii_dump_regs(struct of_device *ofdev, void *buf)
208{
209 struct rgmii_instance *dev = dev_get_drvdata(&ofdev->dev);
210 struct emac_ethtool_regs_subhdr *hdr = buf;
211 struct rgmii_regs *regs = (struct rgmii_regs *)(hdr + 1);
212
213 hdr->version = 0;
214 hdr->index = 0; /* for now, are there chips with more than one
215 * rgmii ? if yes, then we'll add a cell_index
216 * like we do for emac
217 */
218 memcpy_fromio(regs, dev->base, sizeof(struct rgmii_regs));
219 return regs + 1;
220}
221
222
223static int __devinit rgmii_probe(struct of_device *ofdev,
224 const struct of_device_id *match)
225{
226 struct device_node *np = ofdev->node;
227 struct rgmii_instance *dev;
228 struct resource regs;
229 int rc;
230
231 rc = -ENOMEM;
232 dev = kzalloc(sizeof(struct rgmii_instance), GFP_KERNEL);
233 if (dev == NULL) {
234 printk(KERN_ERR "%s: could not allocate RGMII device!\n",
235 np->full_name);
236 goto err_gone;
237 }
238
239 mutex_init(&dev->lock);
240 dev->ofdev = ofdev;
241
242 rc = -ENXIO;
243 if (of_address_to_resource(np, 0, &regs)) {
244 printk(KERN_ERR "%s: Can't get registers address\n",
245 np->full_name);
246 goto err_free;
247 }
248
249 rc = -ENOMEM;
Al Viroeb4d84f2007-10-14 19:36:10 +0100250 dev->base = (struct rgmii_regs __iomem *)ioremap(regs.start,
David Gibson1d3bb992007-08-23 13:56:01 +1000251 sizeof(struct rgmii_regs));
252 if (dev->base == NULL) {
253 printk(KERN_ERR "%s: Can't map device registers!\n",
254 np->full_name);
255 goto err_free;
256 }
257
Benjamin Herrenschmidt1f578772007-12-05 11:14:28 +1100258 /* Check for RGMII flags */
259 if (of_get_property(ofdev->node, "has-mdio", NULL))
260 dev->flags |= EMAC_RGMII_FLAG_HAS_MDIO;
261
262 /* CAB lacks the right properties, fix this up */
Al Viro97be91c2007-10-14 05:50:12 +0100263 if (of_device_is_compatible(ofdev->node, "ibm,rgmii-axon"))
Benjamin Herrenschmidt1f578772007-12-05 11:14:28 +1100264 dev->flags |= EMAC_RGMII_FLAG_HAS_MDIO;
David Gibson1d3bb992007-08-23 13:56:01 +1000265
266 DBG2(dev, " Boot FER = 0x%08x, SSR = 0x%08x\n",
267 in_be32(&dev->base->fer), in_be32(&dev->base->ssr));
268
269 /* Disable all inputs by default */
270 out_be32(&dev->base->fer, 0);
271
272 printk(KERN_INFO
Benjamin Herrenschmidt1f578772007-12-05 11:14:28 +1100273 "RGMII %s initialized with%s MDIO support\n",
274 ofdev->node->full_name,
275 (dev->flags & EMAC_RGMII_FLAG_HAS_MDIO) ? "" : "out");
David Gibson1d3bb992007-08-23 13:56:01 +1000276
277 wmb();
278 dev_set_drvdata(&ofdev->dev, dev);
279
280 return 0;
281
282 err_free:
283 kfree(dev);
284 err_gone:
285 return rc;
286}
287
288static int __devexit rgmii_remove(struct of_device *ofdev)
289{
290 struct rgmii_instance *dev = dev_get_drvdata(&ofdev->dev);
291
292 dev_set_drvdata(&ofdev->dev, NULL);
293
294 WARN_ON(dev->users != 0);
295
296 iounmap(dev->base);
297 kfree(dev);
298
299 return 0;
300}
301
302static struct of_device_id rgmii_match[] =
303{
304 {
305 .type = "rgmii-interface",
306 .compatible = "ibm,rgmii",
307 },
308 {
309 .type = "emac-rgmii",
310 },
311 {},
312};
313
314static struct of_platform_driver rgmii_driver = {
315 .name = "emac-rgmii",
316 .match_table = rgmii_match,
317
318 .probe = rgmii_probe,
319 .remove = rgmii_remove,
320};
321
322int __init rgmii_init(void)
323{
324 return of_register_platform_driver(&rgmii_driver);
325}
326
327void rgmii_exit(void)
328{
329 of_unregister_platform_driver(&rgmii_driver);
330}