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/drivers/net/ethernet/ibm/emac/rgmii.c

http://github.com/mirrors/linux
C | 314 lines | 214 code | 66 blank | 34 comment | 27 complexity | 61e060abfbf52ad0e7d2d0df015dd100 MD5 | raw file
  1// SPDX-License-Identifier: GPL-2.0-or-later
  2/*
  3 * drivers/net/ethernet/ibm/emac/rgmii.c
  4 *
  5 * Driver for PowerPC 4xx on-chip ethernet controller, RGMII bridge support.
  6 *
  7 * Copyright 2007 Benjamin Herrenschmidt, IBM Corp.
  8 *                <benh@kernel.crashing.org>
  9 *
 10 * Based on the arch/ppc version of the driver:
 11 *
 12 * Copyright (c) 2004, 2005 Zultys Technologies.
 13 * Eugene Surovegin <eugene.surovegin@zultys.com> or <ebs@ebshome.net>
 14 *
 15 * Based on original work by
 16 * 	Matt Porter <mporter@kernel.crashing.org>
 17 * 	Copyright 2004 MontaVista Software, Inc.
 18 */
 19#include <linux/slab.h>
 20#include <linux/kernel.h>
 21#include <linux/ethtool.h>
 22#include <linux/of_address.h>
 23#include <asm/io.h>
 24
 25#include "emac.h"
 26#include "debug.h"
 27
 28// XXX FIXME: Axon seems to support a subset of the RGMII, we
 29// thus need to take that into account and possibly change some
 30// of the bit settings below that don't seem to quite match the
 31// AXON spec
 32
 33/* RGMIIx_FER */
 34#define RGMII_FER_MASK(idx)	(0x7 << ((idx) * 4))
 35#define RGMII_FER_RTBI(idx)	(0x4 << ((idx) * 4))
 36#define RGMII_FER_RGMII(idx)	(0x5 << ((idx) * 4))
 37#define RGMII_FER_TBI(idx)	(0x6 << ((idx) * 4))
 38#define RGMII_FER_GMII(idx)	(0x7 << ((idx) * 4))
 39#define RGMII_FER_MII(idx)	RGMII_FER_GMII(idx)
 40
 41/* RGMIIx_SSR */
 42#define RGMII_SSR_MASK(idx)	(0x7 << ((idx) * 8))
 43#define RGMII_SSR_10(idx)	(0x1 << ((idx) * 8))
 44#define RGMII_SSR_100(idx)	(0x2 << ((idx) * 8))
 45#define RGMII_SSR_1000(idx)	(0x4 << ((idx) * 8))
 46
 47/* RGMII bridge supports only GMII/TBI and RGMII/RTBI PHYs */
 48static inline int rgmii_valid_mode(int phy_mode)
 49{
 50	return  phy_interface_mode_is_rgmii(phy_mode) ||
 51		phy_mode == PHY_INTERFACE_MODE_GMII ||
 52		phy_mode == PHY_INTERFACE_MODE_MII ||
 53		phy_mode == PHY_INTERFACE_MODE_TBI ||
 54		phy_mode == PHY_INTERFACE_MODE_RTBI;
 55}
 56
 57static inline u32 rgmii_mode_mask(int mode, int input)
 58{
 59	switch (mode) {
 60	case PHY_INTERFACE_MODE_RGMII:
 61	case PHY_INTERFACE_MODE_RGMII_ID:
 62	case PHY_INTERFACE_MODE_RGMII_RXID:
 63	case PHY_INTERFACE_MODE_RGMII_TXID:
 64		return RGMII_FER_RGMII(input);
 65	case PHY_INTERFACE_MODE_TBI:
 66		return RGMII_FER_TBI(input);
 67	case PHY_INTERFACE_MODE_GMII:
 68		return RGMII_FER_GMII(input);
 69	case PHY_INTERFACE_MODE_MII:
 70		return RGMII_FER_MII(input);
 71	case PHY_INTERFACE_MODE_RTBI:
 72		return RGMII_FER_RTBI(input);
 73	default:
 74		BUG();
 75	}
 76}
 77
 78int rgmii_attach(struct platform_device *ofdev, int input, int mode)
 79{
 80	struct rgmii_instance *dev = platform_get_drvdata(ofdev);
 81	struct rgmii_regs __iomem *p = dev->base;
 82
 83	RGMII_DBG(dev, "attach(%d)" NL, input);
 84
 85	/* Check if we need to attach to a RGMII */
 86	if (input < 0 || !rgmii_valid_mode(mode)) {
 87		printk(KERN_ERR "%pOF: unsupported settings !\n",
 88		       ofdev->dev.of_node);
 89		return -ENODEV;
 90	}
 91
 92	mutex_lock(&dev->lock);
 93
 94	/* Enable this input */
 95	out_be32(&p->fer, in_be32(&p->fer) | rgmii_mode_mask(mode, input));
 96
 97	printk(KERN_NOTICE "%pOF: input %d in %s mode\n",
 98	       ofdev->dev.of_node, input, phy_modes(mode));
 99
100	++dev->users;
101
102	mutex_unlock(&dev->lock);
103
104	return 0;
105}
106
107void rgmii_set_speed(struct platform_device *ofdev, int input, int speed)
108{
109	struct rgmii_instance *dev = platform_get_drvdata(ofdev);
110	struct rgmii_regs __iomem *p = dev->base;
111	u32 ssr;
112
113	mutex_lock(&dev->lock);
114
115	ssr = in_be32(&p->ssr) & ~RGMII_SSR_MASK(input);
116
117	RGMII_DBG(dev, "speed(%d, %d)" NL, input, speed);
118
119	if (speed == SPEED_1000)
120		ssr |= RGMII_SSR_1000(input);
121	else if (speed == SPEED_100)
122		ssr |= RGMII_SSR_100(input);
123	else if (speed == SPEED_10)
124		ssr |= RGMII_SSR_10(input);
125
126	out_be32(&p->ssr, ssr);
127
128	mutex_unlock(&dev->lock);
129}
130
131void rgmii_get_mdio(struct platform_device *ofdev, int input)
132{
133	struct rgmii_instance *dev = platform_get_drvdata(ofdev);
134	struct rgmii_regs __iomem *p = dev->base;
135	u32 fer;
136
137	RGMII_DBG2(dev, "get_mdio(%d)" NL, input);
138
139	if (!(dev->flags & EMAC_RGMII_FLAG_HAS_MDIO))
140		return;
141
142	mutex_lock(&dev->lock);
143
144	fer = in_be32(&p->fer);
145	fer |= 0x00080000u >> input;
146	out_be32(&p->fer, fer);
147	(void)in_be32(&p->fer);
148
149	DBG2(dev, " fer = 0x%08x\n", fer);
150}
151
152void rgmii_put_mdio(struct platform_device *ofdev, int input)
153{
154	struct rgmii_instance *dev = platform_get_drvdata(ofdev);
155	struct rgmii_regs __iomem *p = dev->base;
156	u32 fer;
157
158	RGMII_DBG2(dev, "put_mdio(%d)" NL, input);
159
160	if (!(dev->flags & EMAC_RGMII_FLAG_HAS_MDIO))
161		return;
162
163	fer = in_be32(&p->fer);
164	fer &= ~(0x00080000u >> input);
165	out_be32(&p->fer, fer);
166	(void)in_be32(&p->fer);
167
168	DBG2(dev, " fer = 0x%08x\n", fer);
169
170	mutex_unlock(&dev->lock);
171}
172
173void rgmii_detach(struct platform_device *ofdev, int input)
174{
175	struct rgmii_instance *dev = platform_get_drvdata(ofdev);
176	struct rgmii_regs __iomem *p;
177
178	BUG_ON(!dev || dev->users == 0);
179	p = dev->base;
180
181	mutex_lock(&dev->lock);
182
183	RGMII_DBG(dev, "detach(%d)" NL, input);
184
185	/* Disable this input */
186	out_be32(&p->fer, in_be32(&p->fer) & ~RGMII_FER_MASK(input));
187
188	--dev->users;
189
190	mutex_unlock(&dev->lock);
191}
192
193int rgmii_get_regs_len(struct platform_device *ofdev)
194{
195	return sizeof(struct emac_ethtool_regs_subhdr) +
196		sizeof(struct rgmii_regs);
197}
198
199void *rgmii_dump_regs(struct platform_device *ofdev, void *buf)
200{
201	struct rgmii_instance *dev = platform_get_drvdata(ofdev);
202	struct emac_ethtool_regs_subhdr *hdr = buf;
203	struct rgmii_regs *regs = (struct rgmii_regs *)(hdr + 1);
204
205	hdr->version = 0;
206	hdr->index = 0; /* for now, are there chips with more than one
207			 * rgmii ? if yes, then we'll add a cell_index
208			 * like we do for emac
209			 */
210	memcpy_fromio(regs, dev->base, sizeof(struct rgmii_regs));
211	return regs + 1;
212}
213
214
215static int rgmii_probe(struct platform_device *ofdev)
216{
217	struct device_node *np = ofdev->dev.of_node;
218	struct rgmii_instance *dev;
219	struct resource regs;
220	int rc;
221
222	rc = -ENOMEM;
223	dev = kzalloc(sizeof(struct rgmii_instance), GFP_KERNEL);
224	if (dev == NULL)
225		goto err_gone;
226
227	mutex_init(&dev->lock);
228	dev->ofdev = ofdev;
229
230	rc = -ENXIO;
231	if (of_address_to_resource(np, 0, &regs)) {
232		printk(KERN_ERR "%pOF: Can't get registers address\n", np);
233		goto err_free;
234	}
235
236	rc = -ENOMEM;
237	dev->base = (struct rgmii_regs __iomem *)ioremap(regs.start,
238						 sizeof(struct rgmii_regs));
239	if (dev->base == NULL) {
240		printk(KERN_ERR "%pOF: Can't map device registers!\n", np);
241		goto err_free;
242	}
243
244	/* Check for RGMII flags */
245	if (of_get_property(ofdev->dev.of_node, "has-mdio", NULL))
246		dev->flags |= EMAC_RGMII_FLAG_HAS_MDIO;
247
248	/* CAB lacks the right properties, fix this up */
249	if (of_device_is_compatible(ofdev->dev.of_node, "ibm,rgmii-axon"))
250		dev->flags |= EMAC_RGMII_FLAG_HAS_MDIO;
251
252	DBG2(dev, " Boot FER = 0x%08x, SSR = 0x%08x\n",
253	     in_be32(&dev->base->fer), in_be32(&dev->base->ssr));
254
255	/* Disable all inputs by default */
256	out_be32(&dev->base->fer, 0);
257
258	printk(KERN_INFO
259	       "RGMII %pOF initialized with%s MDIO support\n",
260	       ofdev->dev.of_node,
261	       (dev->flags & EMAC_RGMII_FLAG_HAS_MDIO) ? "" : "out");
262
263	wmb();
264	platform_set_drvdata(ofdev, dev);
265
266	return 0;
267
268 err_free:
269	kfree(dev);
270 err_gone:
271	return rc;
272}
273
274static int rgmii_remove(struct platform_device *ofdev)
275{
276	struct rgmii_instance *dev = platform_get_drvdata(ofdev);
277
278	WARN_ON(dev->users != 0);
279
280	iounmap(dev->base);
281	kfree(dev);
282
283	return 0;
284}
285
286static const struct of_device_id rgmii_match[] =
287{
288	{
289		.compatible	= "ibm,rgmii",
290	},
291	{
292		.type		= "emac-rgmii",
293	},
294	{},
295};
296
297static struct platform_driver rgmii_driver = {
298	.driver = {
299		.name = "emac-rgmii",
300		.of_match_table = rgmii_match,
301	},
302	.probe = rgmii_probe,
303	.remove = rgmii_remove,
304};
305
306int __init rgmii_init(void)
307{
308	return platform_driver_register(&rgmii_driver);
309}
310
311void rgmii_exit(void)
312{
313	platform_driver_unregister(&rgmii_driver);
314}