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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// 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}