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1/*
2 * drivers/net/ethernet/ibm/emac/rgmii.c
3 *
4 * Driver for PowerPC 4xx on-chip ethernet controller, RGMII bridge support.
5 *
6 * Copyright 2007 Benjamin Herrenschmidt, IBM Corp.
7 * <benh@kernel.crashing.org>
8 *
9 * Based on the arch/ppc version of the driver:
10 *
11 * 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/slab.h>
25#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))
43#define RGMII_FER_MII(idx) RGMII_FER_GMII(idx)
44
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 ||
54 phy_mode == PHY_MODE_MII ||
55 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";
69 case PHY_MODE_MII:
70 return "MII";
71 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);
87 case PHY_MODE_MII:
88 return RGMII_FER_MII(input);
89 case PHY_MODE_RTBI:
90 return RGMII_FER_RTBI(input);
91 default:
92 BUG();
93 }
94}
95
96int __devinit rgmii_attach(struct platform_device *ofdev, int input, int mode)
97{
98 struct rgmii_instance *dev = dev_get_drvdata(&ofdev->dev);
99 struct rgmii_regs __iomem *p = dev->base;
100
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",
106 ofdev->dev.of_node->full_name);
107 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",
116 ofdev->dev.of_node->full_name, input, rgmii_mode_name(mode));
117
118 ++dev->users;
119
120 mutex_unlock(&dev->lock);
121
122 return 0;
123}
124
125void rgmii_set_speed(struct platform_device *ofdev, int input, int speed)
126{
127 struct rgmii_instance *dev = dev_get_drvdata(&ofdev->dev);
128 struct rgmii_regs __iomem *p = dev->base;
129 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 platform_device *ofdev, int input)
148{
149 struct rgmii_instance *dev = dev_get_drvdata(&ofdev->dev);
150 struct rgmii_regs __iomem *p = dev->base;
151 u32 fer;
152
153 RGMII_DBG2(dev, "get_mdio(%d)" NL, input);
154
155 if (!(dev->flags & EMAC_RGMII_FLAG_HAS_MDIO))
156 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 platform_device *ofdev, int input)
169{
170 struct rgmii_instance *dev = dev_get_drvdata(&ofdev->dev);
171 struct rgmii_regs __iomem *p = dev->base;
172 u32 fer;
173
174 RGMII_DBG2(dev, "put_mdio(%d)" NL, input);
175
176 if (!(dev->flags & EMAC_RGMII_FLAG_HAS_MDIO))
177 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
189void rgmii_detach(struct platform_device *ofdev, int input)
190{
191 struct rgmii_instance *dev = dev_get_drvdata(&ofdev->dev);
192 struct rgmii_regs __iomem *p;
193
194 BUG_ON(!dev || dev->users == 0);
195 p = dev->base;
196
197 mutex_lock(&dev->lock);
198
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 platform_device *ofdev)
210{
211 return sizeof(struct emac_ethtool_regs_subhdr) +
212 sizeof(struct rgmii_regs);
213}
214
215void *rgmii_dump_regs(struct platform_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 platform_device *ofdev)
232{
233 struct device_node *np = ofdev->dev.of_node;
234 struct rgmii_instance *dev;
235 struct resource regs;
236 int rc;
237
238 rc = -ENOMEM;
239 dev = kzalloc(sizeof(struct rgmii_instance), GFP_KERNEL);
240 if (dev == NULL)
241 goto err_gone;
242
243 mutex_init(&dev->lock);
244 dev->ofdev = ofdev;
245
246 rc = -ENXIO;
247 if (of_address_to_resource(np, 0, ®s)) {
248 printk(KERN_ERR "%s: Can't get registers address\n",
249 np->full_name);
250 goto err_free;
251 }
252
253 rc = -ENOMEM;
254 dev->base = (struct rgmii_regs __iomem *)ioremap(regs.start,
255 sizeof(struct rgmii_regs));
256 if (dev->base == NULL) {
257 printk(KERN_ERR "%s: Can't map device registers!\n",
258 np->full_name);
259 goto err_free;
260 }
261
262 /* Check for RGMII flags */
263 if (of_get_property(ofdev->dev.of_node, "has-mdio", NULL))
264 dev->flags |= EMAC_RGMII_FLAG_HAS_MDIO;
265
266 /* CAB lacks the right properties, fix this up */
267 if (of_device_is_compatible(ofdev->dev.of_node, "ibm,rgmii-axon"))
268 dev->flags |= EMAC_RGMII_FLAG_HAS_MDIO;
269
270 DBG2(dev, " Boot FER = 0x%08x, SSR = 0x%08x\n",
271 in_be32(&dev->base->fer), in_be32(&dev->base->ssr));
272
273 /* Disable all inputs by default */
274 out_be32(&dev->base->fer, 0);
275
276 printk(KERN_INFO
277 "RGMII %s initialized with%s MDIO support\n",
278 ofdev->dev.of_node->full_name,
279 (dev->flags & EMAC_RGMII_FLAG_HAS_MDIO) ? "" : "out");
280
281 wmb();
282 dev_set_drvdata(&ofdev->dev, dev);
283
284 return 0;
285
286 err_free:
287 kfree(dev);
288 err_gone:
289 return rc;
290}
291
292static int __devexit rgmii_remove(struct platform_device *ofdev)
293{
294 struct rgmii_instance *dev = dev_get_drvdata(&ofdev->dev);
295
296 dev_set_drvdata(&ofdev->dev, NULL);
297
298 WARN_ON(dev->users != 0);
299
300 iounmap(dev->base);
301 kfree(dev);
302
303 return 0;
304}
305
306static struct of_device_id rgmii_match[] =
307{
308 {
309 .compatible = "ibm,rgmii",
310 },
311 {
312 .type = "emac-rgmii",
313 },
314 {},
315};
316
317static struct platform_driver rgmii_driver = {
318 .driver = {
319 .name = "emac-rgmii",
320 .owner = THIS_MODULE,
321 .of_match_table = rgmii_match,
322 },
323 .probe = rgmii_probe,
324 .remove = rgmii_remove,
325};
326
327int __init rgmii_init(void)
328{
329 return platform_driver_register(&rgmii_driver);
330}
331
332void rgmii_exit(void)
333{
334 platform_driver_unregister(&rgmii_driver);
335}
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, ®s)) {
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}