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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.h>
23#include <linux/of_address.h>
24#include <linux/platform_device.h>
25#include <asm/io.h>
26
27#include "emac.h"
28#include "debug.h"
29
30// XXX FIXME: Axon seems to support a subset of the RGMII, we
31// thus need to take that into account and possibly change some
32// of the bit settings below that don't seem to quite match the
33// AXON spec
34
35/* RGMIIx_FER */
36#define RGMII_FER_MASK(idx) (0x7 << ((idx) * 4))
37#define RGMII_FER_RTBI(idx) (0x4 << ((idx) * 4))
38#define RGMII_FER_RGMII(idx) (0x5 << ((idx) * 4))
39#define RGMII_FER_TBI(idx) (0x6 << ((idx) * 4))
40#define RGMII_FER_GMII(idx) (0x7 << ((idx) * 4))
41#define RGMII_FER_MII(idx) RGMII_FER_GMII(idx)
42
43/* RGMIIx_SSR */
44#define RGMII_SSR_MASK(idx) (0x7 << ((idx) * 8))
45#define RGMII_SSR_10(idx) (0x1 << ((idx) * 8))
46#define RGMII_SSR_100(idx) (0x2 << ((idx) * 8))
47#define RGMII_SSR_1000(idx) (0x4 << ((idx) * 8))
48
49/* RGMII bridge supports only GMII/TBI and RGMII/RTBI PHYs */
50static inline int rgmii_valid_mode(int phy_mode)
51{
52 return phy_interface_mode_is_rgmii(phy_mode) ||
53 phy_mode == PHY_INTERFACE_MODE_GMII ||
54 phy_mode == PHY_INTERFACE_MODE_MII ||
55 phy_mode == PHY_INTERFACE_MODE_TBI ||
56 phy_mode == PHY_INTERFACE_MODE_RTBI;
57}
58
59static inline u32 rgmii_mode_mask(int mode, int input)
60{
61 switch (mode) {
62 case PHY_INTERFACE_MODE_RGMII:
63 case PHY_INTERFACE_MODE_RGMII_ID:
64 case PHY_INTERFACE_MODE_RGMII_RXID:
65 case PHY_INTERFACE_MODE_RGMII_TXID:
66 return RGMII_FER_RGMII(input);
67 case PHY_INTERFACE_MODE_TBI:
68 return RGMII_FER_TBI(input);
69 case PHY_INTERFACE_MODE_GMII:
70 return RGMII_FER_GMII(input);
71 case PHY_INTERFACE_MODE_MII:
72 return RGMII_FER_MII(input);
73 case PHY_INTERFACE_MODE_RTBI:
74 return RGMII_FER_RTBI(input);
75 default:
76 BUG();
77 }
78}
79
80int rgmii_attach(struct platform_device *ofdev, int input, int mode)
81{
82 struct rgmii_instance *dev = platform_get_drvdata(ofdev);
83 struct rgmii_regs __iomem *p = dev->base;
84
85 RGMII_DBG(dev, "attach(%d)" NL, input);
86
87 /* Check if we need to attach to a RGMII */
88 if (input < 0 || !rgmii_valid_mode(mode)) {
89 printk(KERN_ERR "%pOF: unsupported settings !\n",
90 ofdev->dev.of_node);
91 return -ENODEV;
92 }
93
94 mutex_lock(&dev->lock);
95
96 /* Enable this input */
97 out_be32(&p->fer, in_be32(&p->fer) | rgmii_mode_mask(mode, input));
98
99 printk(KERN_NOTICE "%pOF: input %d in %s mode\n",
100 ofdev->dev.of_node, input, phy_modes(mode));
101
102 ++dev->users;
103
104 mutex_unlock(&dev->lock);
105
106 return 0;
107}
108
109void rgmii_set_speed(struct platform_device *ofdev, int input, int speed)
110{
111 struct rgmii_instance *dev = platform_get_drvdata(ofdev);
112 struct rgmii_regs __iomem *p = dev->base;
113 u32 ssr;
114
115 mutex_lock(&dev->lock);
116
117 ssr = in_be32(&p->ssr) & ~RGMII_SSR_MASK(input);
118
119 RGMII_DBG(dev, "speed(%d, %d)" NL, input, speed);
120
121 if (speed == SPEED_1000)
122 ssr |= RGMII_SSR_1000(input);
123 else if (speed == SPEED_100)
124 ssr |= RGMII_SSR_100(input);
125 else if (speed == SPEED_10)
126 ssr |= RGMII_SSR_10(input);
127
128 out_be32(&p->ssr, ssr);
129
130 mutex_unlock(&dev->lock);
131}
132
133void rgmii_get_mdio(struct platform_device *ofdev, int input)
134{
135 struct rgmii_instance *dev = platform_get_drvdata(ofdev);
136 struct rgmii_regs __iomem *p = dev->base;
137 u32 fer;
138
139 RGMII_DBG2(dev, "get_mdio(%d)" NL, input);
140
141 if (!(dev->flags & EMAC_RGMII_FLAG_HAS_MDIO))
142 return;
143
144 mutex_lock(&dev->lock);
145
146 fer = in_be32(&p->fer);
147 fer |= 0x00080000u >> input;
148 out_be32(&p->fer, fer);
149 (void)in_be32(&p->fer);
150
151 DBG2(dev, " fer = 0x%08x\n", fer);
152}
153
154void rgmii_put_mdio(struct platform_device *ofdev, int input)
155{
156 struct rgmii_instance *dev = platform_get_drvdata(ofdev);
157 struct rgmii_regs __iomem *p = dev->base;
158 u32 fer;
159
160 RGMII_DBG2(dev, "put_mdio(%d)" NL, input);
161
162 if (!(dev->flags & EMAC_RGMII_FLAG_HAS_MDIO))
163 return;
164
165 fer = in_be32(&p->fer);
166 fer &= ~(0x00080000u >> input);
167 out_be32(&p->fer, fer);
168 (void)in_be32(&p->fer);
169
170 DBG2(dev, " fer = 0x%08x\n", fer);
171
172 mutex_unlock(&dev->lock);
173}
174
175void rgmii_detach(struct platform_device *ofdev, int input)
176{
177 struct rgmii_instance *dev = platform_get_drvdata(ofdev);
178 struct rgmii_regs __iomem *p;
179
180 BUG_ON(!dev || dev->users == 0);
181 p = dev->base;
182
183 mutex_lock(&dev->lock);
184
185 RGMII_DBG(dev, "detach(%d)" NL, input);
186
187 /* Disable this input */
188 out_be32(&p->fer, in_be32(&p->fer) & ~RGMII_FER_MASK(input));
189
190 --dev->users;
191
192 mutex_unlock(&dev->lock);
193}
194
195int rgmii_get_regs_len(struct platform_device *ofdev)
196{
197 return sizeof(struct emac_ethtool_regs_subhdr) +
198 sizeof(struct rgmii_regs);
199}
200
201void *rgmii_dump_regs(struct platform_device *ofdev, void *buf)
202{
203 struct rgmii_instance *dev = platform_get_drvdata(ofdev);
204 struct emac_ethtool_regs_subhdr *hdr = buf;
205 struct rgmii_regs *regs = (struct rgmii_regs *)(hdr + 1);
206
207 hdr->version = 0;
208 hdr->index = 0; /* for now, are there chips with more than one
209 * rgmii ? if yes, then we'll add a cell_index
210 * like we do for emac
211 */
212 memcpy_fromio(regs, dev->base, sizeof(struct rgmii_regs));
213 return regs + 1;
214}
215
216
217static int rgmii_probe(struct platform_device *ofdev)
218{
219 struct device_node *np = ofdev->dev.of_node;
220 struct rgmii_instance *dev;
221 struct resource regs;
222 int rc;
223
224 rc = -ENOMEM;
225 dev = kzalloc(sizeof(struct rgmii_instance), GFP_KERNEL);
226 if (dev == NULL)
227 goto err_gone;
228
229 mutex_init(&dev->lock);
230 dev->ofdev = ofdev;
231
232 rc = -ENXIO;
233 if (of_address_to_resource(np, 0, ®s)) {
234 printk(KERN_ERR "%pOF: Can't get registers address\n", np);
235 goto err_free;
236 }
237
238 rc = -ENOMEM;
239 dev->base = (struct rgmii_regs __iomem *)ioremap(regs.start,
240 sizeof(struct rgmii_regs));
241 if (dev->base == NULL) {
242 printk(KERN_ERR "%pOF: Can't map device registers!\n", np);
243 goto err_free;
244 }
245
246 /* Check for RGMII flags */
247 if (of_property_read_bool(ofdev->dev.of_node, "has-mdio"))
248 dev->flags |= EMAC_RGMII_FLAG_HAS_MDIO;
249
250 /* CAB lacks the right properties, fix this up */
251 if (of_device_is_compatible(ofdev->dev.of_node, "ibm,rgmii-axon"))
252 dev->flags |= EMAC_RGMII_FLAG_HAS_MDIO;
253
254 DBG2(dev, " Boot FER = 0x%08x, SSR = 0x%08x\n",
255 in_be32(&dev->base->fer), in_be32(&dev->base->ssr));
256
257 /* Disable all inputs by default */
258 out_be32(&dev->base->fer, 0);
259
260 printk(KERN_INFO
261 "RGMII %pOF initialized with%s MDIO support\n",
262 ofdev->dev.of_node,
263 (dev->flags & EMAC_RGMII_FLAG_HAS_MDIO) ? "" : "out");
264
265 wmb();
266 platform_set_drvdata(ofdev, dev);
267
268 return 0;
269
270 err_free:
271 kfree(dev);
272 err_gone:
273 return rc;
274}
275
276static void rgmii_remove(struct platform_device *ofdev)
277{
278 struct rgmii_instance *dev = platform_get_drvdata(ofdev);
279
280 WARN_ON(dev->users != 0);
281
282 iounmap(dev->base);
283 kfree(dev);
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_new = 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}
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}