blob: 108919bcdf137959d9bb2b5957607132ebabb407 [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 */
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090024#include <linux/slab.h>
David Gibson1d3bb992007-08-23 13:56:01 +100025#include <linux/kernel.h>
26#include <linux/ethtool.h>
27#include <asm/io.h>
28
29#include "emac.h"
30#include "debug.h"
31
32// XXX FIXME: Axon seems to support a subset of the RGMII, we
33// thus need to take that into account and possibly change some
34// of the bit settings below that don't seem to quite match the
35// AXON spec
36
37/* RGMIIx_FER */
38#define RGMII_FER_MASK(idx) (0x7 << ((idx) * 4))
39#define RGMII_FER_RTBI(idx) (0x4 << ((idx) * 4))
40#define RGMII_FER_RGMII(idx) (0x5 << ((idx) * 4))
41#define RGMII_FER_TBI(idx) (0x6 << ((idx) * 4))
42#define RGMII_FER_GMII(idx) (0x7 << ((idx) * 4))
Grant Erickson004ea682008-07-09 01:03:06 +100043#define RGMII_FER_MII(idx) RGMII_FER_GMII(idx)
David Gibson1d3bb992007-08-23 13:56:01 +100044
45/* RGMIIx_SSR */
46#define RGMII_SSR_MASK(idx) (0x7 << ((idx) * 8))
47#define RGMII_SSR_100(idx) (0x2 << ((idx) * 8))
48#define RGMII_SSR_1000(idx) (0x4 << ((idx) * 8))
49
50/* RGMII bridge supports only GMII/TBI and RGMII/RTBI PHYs */
51static inline int rgmii_valid_mode(int phy_mode)
52{
53 return phy_mode == PHY_MODE_GMII ||
Grant Erickson004ea682008-07-09 01:03:06 +100054 phy_mode == PHY_MODE_MII ||
David Gibson1d3bb992007-08-23 13:56:01 +100055 phy_mode == PHY_MODE_RGMII ||
56 phy_mode == PHY_MODE_TBI ||
57 phy_mode == PHY_MODE_RTBI;
58}
59
60static inline const char *rgmii_mode_name(int mode)
61{
62 switch (mode) {
63 case PHY_MODE_RGMII:
64 return "RGMII";
65 case PHY_MODE_TBI:
66 return "TBI";
67 case PHY_MODE_GMII:
68 return "GMII";
Grant Erickson004ea682008-07-09 01:03:06 +100069 case PHY_MODE_MII:
70 return "MII";
David Gibson1d3bb992007-08-23 13:56:01 +100071 case PHY_MODE_RTBI:
72 return "RTBI";
73 default:
74 BUG();
75 }
76}
77
78static inline u32 rgmii_mode_mask(int mode, int input)
79{
80 switch (mode) {
81 case PHY_MODE_RGMII:
82 return RGMII_FER_RGMII(input);
83 case PHY_MODE_TBI:
84 return RGMII_FER_TBI(input);
85 case PHY_MODE_GMII:
86 return RGMII_FER_GMII(input);
Grant Erickson004ea682008-07-09 01:03:06 +100087 case PHY_MODE_MII:
88 return RGMII_FER_MII(input);
David Gibson1d3bb992007-08-23 13:56:01 +100089 case PHY_MODE_RTBI:
90 return RGMII_FER_RTBI(input);
91 default:
92 BUG();
93 }
94}
95
96int __devinit rgmii_attach(struct of_device *ofdev, int input, int mode)
97{
98 struct rgmii_instance *dev = dev_get_drvdata(&ofdev->dev);
Al Viroeb4d84f2007-10-14 19:36:10 +010099 struct rgmii_regs __iomem *p = dev->base;
David Gibson1d3bb992007-08-23 13:56:01 +1000100
101 RGMII_DBG(dev, "attach(%d)" NL, input);
102
103 /* Check if we need to attach to a RGMII */
104 if (input < 0 || !rgmii_valid_mode(mode)) {
105 printk(KERN_ERR "%s: unsupported settings !\n",
Grant Likely61c7a082010-04-13 16:12:29 -0700106 ofdev->dev.of_node->full_name);
David Gibson1d3bb992007-08-23 13:56:01 +1000107 return -ENODEV;
108 }
109
110 mutex_lock(&dev->lock);
111
112 /* Enable this input */
113 out_be32(&p->fer, in_be32(&p->fer) | rgmii_mode_mask(mode, input));
114
115 printk(KERN_NOTICE "%s: input %d in %s mode\n",
Grant Likely61c7a082010-04-13 16:12:29 -0700116 ofdev->dev.of_node->full_name, input, rgmii_mode_name(mode));
David Gibson1d3bb992007-08-23 13:56:01 +1000117
118 ++dev->users;
119
120 mutex_unlock(&dev->lock);
121
122 return 0;
123}
124
125void rgmii_set_speed(struct of_device *ofdev, int input, int speed)
126{
127 struct rgmii_instance *dev = dev_get_drvdata(&ofdev->dev);
Al Viroeb4d84f2007-10-14 19:36:10 +0100128 struct rgmii_regs __iomem *p = dev->base;
David Gibson1d3bb992007-08-23 13:56:01 +1000129 u32 ssr;
130
131 mutex_lock(&dev->lock);
132
133 ssr = in_be32(&p->ssr) & ~RGMII_SSR_MASK(input);
134
135 RGMII_DBG(dev, "speed(%d, %d)" NL, input, speed);
136
137 if (speed == SPEED_1000)
138 ssr |= RGMII_SSR_1000(input);
139 else if (speed == SPEED_100)
140 ssr |= RGMII_SSR_100(input);
141
142 out_be32(&p->ssr, ssr);
143
144 mutex_unlock(&dev->lock);
145}
146
147void rgmii_get_mdio(struct of_device *ofdev, int input)
148{
149 struct rgmii_instance *dev = dev_get_drvdata(&ofdev->dev);
Al Viroeb4d84f2007-10-14 19:36:10 +0100150 struct rgmii_regs __iomem *p = dev->base;
David Gibson1d3bb992007-08-23 13:56:01 +1000151 u32 fer;
152
153 RGMII_DBG2(dev, "get_mdio(%d)" NL, input);
154
Benjamin Herrenschmidt1f578772007-12-05 11:14:28 +1100155 if (!(dev->flags & EMAC_RGMII_FLAG_HAS_MDIO))
David Gibson1d3bb992007-08-23 13:56:01 +1000156 return;
157
158 mutex_lock(&dev->lock);
159
160 fer = in_be32(&p->fer);
161 fer |= 0x00080000u >> input;
162 out_be32(&p->fer, fer);
163 (void)in_be32(&p->fer);
164
165 DBG2(dev, " fer = 0x%08x\n", fer);
166}
167
168void rgmii_put_mdio(struct of_device *ofdev, int input)
169{
170 struct rgmii_instance *dev = dev_get_drvdata(&ofdev->dev);
Al Viroeb4d84f2007-10-14 19:36:10 +0100171 struct rgmii_regs __iomem *p = dev->base;
David Gibson1d3bb992007-08-23 13:56:01 +1000172 u32 fer;
173
174 RGMII_DBG2(dev, "put_mdio(%d)" NL, input);
175
Benjamin Herrenschmidt1f578772007-12-05 11:14:28 +1100176 if (!(dev->flags & EMAC_RGMII_FLAG_HAS_MDIO))
David Gibson1d3bb992007-08-23 13:56:01 +1000177 return;
178
179 fer = in_be32(&p->fer);
180 fer &= ~(0x00080000u >> input);
181 out_be32(&p->fer, fer);
182 (void)in_be32(&p->fer);
183
184 DBG2(dev, " fer = 0x%08x\n", fer);
185
186 mutex_unlock(&dev->lock);
187}
188
Josh Boyer51d4a1c2008-04-22 10:46:43 +1000189void rgmii_detach(struct of_device *ofdev, int input)
David Gibson1d3bb992007-08-23 13:56:01 +1000190{
191 struct rgmii_instance *dev = dev_get_drvdata(&ofdev->dev);
Julia Lawall00211952009-07-19 06:13:04 +0000192 struct rgmii_regs __iomem *p;
David Gibson1d3bb992007-08-23 13:56:01 +1000193
194 BUG_ON(!dev || dev->users == 0);
Julia Lawall00211952009-07-19 06:13:04 +0000195 p = dev->base;
196
197 mutex_lock(&dev->lock);
David Gibson1d3bb992007-08-23 13:56:01 +1000198
199 RGMII_DBG(dev, "detach(%d)" NL, input);
200
201 /* Disable this input */
202 out_be32(&p->fer, in_be32(&p->fer) & ~RGMII_FER_MASK(input));
203
204 --dev->users;
205
206 mutex_unlock(&dev->lock);
207}
208
209int rgmii_get_regs_len(struct of_device *ofdev)
210{
211 return sizeof(struct emac_ethtool_regs_subhdr) +
212 sizeof(struct rgmii_regs);
213}
214
215void *rgmii_dump_regs(struct of_device *ofdev, void *buf)
216{
217 struct rgmii_instance *dev = dev_get_drvdata(&ofdev->dev);
218 struct emac_ethtool_regs_subhdr *hdr = buf;
219 struct rgmii_regs *regs = (struct rgmii_regs *)(hdr + 1);
220
221 hdr->version = 0;
222 hdr->index = 0; /* for now, are there chips with more than one
223 * rgmii ? if yes, then we'll add a cell_index
224 * like we do for emac
225 */
226 memcpy_fromio(regs, dev->base, sizeof(struct rgmii_regs));
227 return regs + 1;
228}
229
230
231static int __devinit rgmii_probe(struct of_device *ofdev,
232 const struct of_device_id *match)
233{
Grant Likely61c7a082010-04-13 16:12:29 -0700234 struct device_node *np = ofdev->dev.of_node;
David Gibson1d3bb992007-08-23 13:56:01 +1000235 struct rgmii_instance *dev;
236 struct resource regs;
237 int rc;
238
239 rc = -ENOMEM;
240 dev = kzalloc(sizeof(struct rgmii_instance), GFP_KERNEL);
241 if (dev == NULL) {
242 printk(KERN_ERR "%s: could not allocate RGMII device!\n",
243 np->full_name);
244 goto err_gone;
245 }
246
247 mutex_init(&dev->lock);
248 dev->ofdev = ofdev;
249
250 rc = -ENXIO;
251 if (of_address_to_resource(np, 0, &regs)) {
252 printk(KERN_ERR "%s: Can't get registers address\n",
253 np->full_name);
254 goto err_free;
255 }
256
257 rc = -ENOMEM;
Al Viroeb4d84f2007-10-14 19:36:10 +0100258 dev->base = (struct rgmii_regs __iomem *)ioremap(regs.start,
David Gibson1d3bb992007-08-23 13:56:01 +1000259 sizeof(struct rgmii_regs));
260 if (dev->base == NULL) {
261 printk(KERN_ERR "%s: Can't map device registers!\n",
262 np->full_name);
263 goto err_free;
264 }
265
Benjamin Herrenschmidt1f578772007-12-05 11:14:28 +1100266 /* Check for RGMII flags */
Grant Likely61c7a082010-04-13 16:12:29 -0700267 if (of_get_property(ofdev->dev.of_node, "has-mdio", NULL))
Benjamin Herrenschmidt1f578772007-12-05 11:14:28 +1100268 dev->flags |= EMAC_RGMII_FLAG_HAS_MDIO;
269
270 /* CAB lacks the right properties, fix this up */
Grant Likely61c7a082010-04-13 16:12:29 -0700271 if (of_device_is_compatible(ofdev->dev.of_node, "ibm,rgmii-axon"))
Benjamin Herrenschmidt1f578772007-12-05 11:14:28 +1100272 dev->flags |= EMAC_RGMII_FLAG_HAS_MDIO;
David Gibson1d3bb992007-08-23 13:56:01 +1000273
274 DBG2(dev, " Boot FER = 0x%08x, SSR = 0x%08x\n",
275 in_be32(&dev->base->fer), in_be32(&dev->base->ssr));
276
277 /* Disable all inputs by default */
278 out_be32(&dev->base->fer, 0);
279
280 printk(KERN_INFO
Benjamin Herrenschmidt1f578772007-12-05 11:14:28 +1100281 "RGMII %s initialized with%s MDIO support\n",
Grant Likely61c7a082010-04-13 16:12:29 -0700282 ofdev->dev.of_node->full_name,
Benjamin Herrenschmidt1f578772007-12-05 11:14:28 +1100283 (dev->flags & EMAC_RGMII_FLAG_HAS_MDIO) ? "" : "out");
David Gibson1d3bb992007-08-23 13:56:01 +1000284
285 wmb();
286 dev_set_drvdata(&ofdev->dev, dev);
287
288 return 0;
289
290 err_free:
291 kfree(dev);
292 err_gone:
293 return rc;
294}
295
296static int __devexit rgmii_remove(struct of_device *ofdev)
297{
298 struct rgmii_instance *dev = dev_get_drvdata(&ofdev->dev);
299
300 dev_set_drvdata(&ofdev->dev, NULL);
301
302 WARN_ON(dev->users != 0);
303
304 iounmap(dev->base);
305 kfree(dev);
306
307 return 0;
308}
309
310static struct of_device_id rgmii_match[] =
311{
312 {
David Gibson1d3bb992007-08-23 13:56:01 +1000313 .compatible = "ibm,rgmii",
314 },
315 {
316 .type = "emac-rgmii",
317 },
318 {},
319};
320
321static struct of_platform_driver rgmii_driver = {
Grant Likely40182942010-04-13 16:13:02 -0700322 .driver = {
323 .name = "emac-rgmii",
324 .owner = THIS_MODULE,
325 .of_match_table = rgmii_match,
326 },
David Gibson1d3bb992007-08-23 13:56:01 +1000327 .probe = rgmii_probe,
328 .remove = rgmii_remove,
329};
330
331int __init rgmii_init(void)
332{
333 return of_register_platform_driver(&rgmii_driver);
334}
335
336void rgmii_exit(void)
337{
338 of_unregister_platform_driver(&rgmii_driver);
339}