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1/*
2 * drivers/net/ethernet/ibm/emac/zmii.c
3 *
4 * Driver for PowerPC 4xx on-chip ethernet controller, ZMII 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 * Armin Kuster <akuster@mvista.com>
16 * Copyright 2001 MontaVista Softare 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 "core.h"
31
32/* ZMIIx_FER */
33#define ZMII_FER_MDI(idx) (0x80000000 >> ((idx) * 4))
34#define ZMII_FER_MDI_ALL (ZMII_FER_MDI(0) | ZMII_FER_MDI(1) | \
35 ZMII_FER_MDI(2) | ZMII_FER_MDI(3))
36
37#define ZMII_FER_SMII(idx) (0x40000000 >> ((idx) * 4))
38#define ZMII_FER_RMII(idx) (0x20000000 >> ((idx) * 4))
39#define ZMII_FER_MII(idx) (0x10000000 >> ((idx) * 4))
40
41/* ZMIIx_SSR */
42#define ZMII_SSR_SCI(idx) (0x40000000 >> ((idx) * 4))
43#define ZMII_SSR_FSS(idx) (0x20000000 >> ((idx) * 4))
44#define ZMII_SSR_SP(idx) (0x10000000 >> ((idx) * 4))
45
46/* ZMII only supports MII, RMII and SMII
47 * we also support autodetection for backward compatibility
48 */
49static inline int zmii_valid_mode(int mode)
50{
51 return mode == PHY_MODE_MII ||
52 mode == PHY_MODE_RMII ||
53 mode == PHY_MODE_SMII ||
54 mode == PHY_MODE_NA;
55}
56
57static inline const char *zmii_mode_name(int mode)
58{
59 switch (mode) {
60 case PHY_MODE_MII:
61 return "MII";
62 case PHY_MODE_RMII:
63 return "RMII";
64 case PHY_MODE_SMII:
65 return "SMII";
66 default:
67 BUG();
68 }
69}
70
71static inline u32 zmii_mode_mask(int mode, int input)
72{
73 switch (mode) {
74 case PHY_MODE_MII:
75 return ZMII_FER_MII(input);
76 case PHY_MODE_RMII:
77 return ZMII_FER_RMII(input);
78 case PHY_MODE_SMII:
79 return ZMII_FER_SMII(input);
80 default:
81 return 0;
82 }
83}
84
85int __devinit zmii_attach(struct platform_device *ofdev, int input, int *mode)
86{
87 struct zmii_instance *dev = dev_get_drvdata(&ofdev->dev);
88 struct zmii_regs __iomem *p = dev->base;
89
90 ZMII_DBG(dev, "init(%d, %d)" NL, input, *mode);
91
92 if (!zmii_valid_mode(*mode)) {
93 /* Probably an EMAC connected to RGMII,
94 * but it still may need ZMII for MDIO so
95 * we don't fail here.
96 */
97 dev->users++;
98 return 0;
99 }
100
101 mutex_lock(&dev->lock);
102
103 /* Autodetect ZMII mode if not specified.
104 * This is only for backward compatibility with the old driver.
105 * Please, always specify PHY mode in your board port to avoid
106 * any surprises.
107 */
108 if (dev->mode == PHY_MODE_NA) {
109 if (*mode == PHY_MODE_NA) {
110 u32 r = dev->fer_save;
111
112 ZMII_DBG(dev, "autodetecting mode, FER = 0x%08x" NL, r);
113
114 if (r & (ZMII_FER_MII(0) | ZMII_FER_MII(1)))
115 dev->mode = PHY_MODE_MII;
116 else if (r & (ZMII_FER_RMII(0) | ZMII_FER_RMII(1)))
117 dev->mode = PHY_MODE_RMII;
118 else
119 dev->mode = PHY_MODE_SMII;
120 } else
121 dev->mode = *mode;
122
123 printk(KERN_NOTICE "%s: bridge in %s mode\n",
124 ofdev->dev.of_node->full_name,
125 zmii_mode_name(dev->mode));
126 } else {
127 /* All inputs must use the same mode */
128 if (*mode != PHY_MODE_NA && *mode != dev->mode) {
129 printk(KERN_ERR
130 "%s: invalid mode %d specified for input %d\n",
131 ofdev->dev.of_node->full_name, *mode, input);
132 mutex_unlock(&dev->lock);
133 return -EINVAL;
134 }
135 }
136
137 /* Report back correct PHY mode,
138 * it may be used during PHY initialization.
139 */
140 *mode = dev->mode;
141
142 /* Enable this input */
143 out_be32(&p->fer, in_be32(&p->fer) | zmii_mode_mask(dev->mode, input));
144 ++dev->users;
145
146 mutex_unlock(&dev->lock);
147
148 return 0;
149}
150
151void zmii_get_mdio(struct platform_device *ofdev, int input)
152{
153 struct zmii_instance *dev = dev_get_drvdata(&ofdev->dev);
154 u32 fer;
155
156 ZMII_DBG2(dev, "get_mdio(%d)" NL, input);
157
158 mutex_lock(&dev->lock);
159
160 fer = in_be32(&dev->base->fer) & ~ZMII_FER_MDI_ALL;
161 out_be32(&dev->base->fer, fer | ZMII_FER_MDI(input));
162}
163
164void zmii_put_mdio(struct platform_device *ofdev, int input)
165{
166 struct zmii_instance *dev = dev_get_drvdata(&ofdev->dev);
167
168 ZMII_DBG2(dev, "put_mdio(%d)" NL, input);
169 mutex_unlock(&dev->lock);
170}
171
172
173void zmii_set_speed(struct platform_device *ofdev, int input, int speed)
174{
175 struct zmii_instance *dev = dev_get_drvdata(&ofdev->dev);
176 u32 ssr;
177
178 mutex_lock(&dev->lock);
179
180 ssr = in_be32(&dev->base->ssr);
181
182 ZMII_DBG(dev, "speed(%d, %d)" NL, input, speed);
183
184 if (speed == SPEED_100)
185 ssr |= ZMII_SSR_SP(input);
186 else
187 ssr &= ~ZMII_SSR_SP(input);
188
189 out_be32(&dev->base->ssr, ssr);
190
191 mutex_unlock(&dev->lock);
192}
193
194void zmii_detach(struct platform_device *ofdev, int input)
195{
196 struct zmii_instance *dev = dev_get_drvdata(&ofdev->dev);
197
198 BUG_ON(!dev || dev->users == 0);
199
200 mutex_lock(&dev->lock);
201
202 ZMII_DBG(dev, "detach(%d)" NL, input);
203
204 /* Disable this input */
205 out_be32(&dev->base->fer,
206 in_be32(&dev->base->fer) & ~zmii_mode_mask(dev->mode, input));
207
208 --dev->users;
209
210 mutex_unlock(&dev->lock);
211}
212
213int zmii_get_regs_len(struct platform_device *ofdev)
214{
215 return sizeof(struct emac_ethtool_regs_subhdr) +
216 sizeof(struct zmii_regs);
217}
218
219void *zmii_dump_regs(struct platform_device *ofdev, void *buf)
220{
221 struct zmii_instance *dev = dev_get_drvdata(&ofdev->dev);
222 struct emac_ethtool_regs_subhdr *hdr = buf;
223 struct zmii_regs *regs = (struct zmii_regs *)(hdr + 1);
224
225 hdr->version = 0;
226 hdr->index = 0; /* for now, are there chips with more than one
227 * zmii ? if yes, then we'll add a cell_index
228 * like we do for emac
229 */
230 memcpy_fromio(regs, dev->base, sizeof(struct zmii_regs));
231 return regs + 1;
232}
233
234static int __devinit zmii_probe(struct platform_device *ofdev)
235{
236 struct device_node *np = ofdev->dev.of_node;
237 struct zmii_instance *dev;
238 struct resource regs;
239 int rc;
240
241 rc = -ENOMEM;
242 dev = kzalloc(sizeof(struct zmii_instance), GFP_KERNEL);
243 if (dev == NULL)
244 goto err_gone;
245
246 mutex_init(&dev->lock);
247 dev->ofdev = ofdev;
248 dev->mode = PHY_MODE_NA;
249
250 rc = -ENXIO;
251 if (of_address_to_resource(np, 0, ®s)) {
252 printk(KERN_ERR "%s: Can't get registers address\n",
253 np->full_name);
254 goto err_free;
255 }
256
257 rc = -ENOMEM;
258 dev->base = (struct zmii_regs __iomem *)ioremap(regs.start,
259 sizeof(struct zmii_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
266 /* We may need FER value for autodetection later */
267 dev->fer_save = in_be32(&dev->base->fer);
268
269 /* Disable all inputs by default */
270 out_be32(&dev->base->fer, 0);
271
272 printk(KERN_INFO
273 "ZMII %s initialized\n", ofdev->dev.of_node->full_name);
274 wmb();
275 dev_set_drvdata(&ofdev->dev, dev);
276
277 return 0;
278
279 err_free:
280 kfree(dev);
281 err_gone:
282 return rc;
283}
284
285static int __devexit zmii_remove(struct platform_device *ofdev)
286{
287 struct zmii_instance *dev = dev_get_drvdata(&ofdev->dev);
288
289 dev_set_drvdata(&ofdev->dev, NULL);
290
291 WARN_ON(dev->users != 0);
292
293 iounmap(dev->base);
294 kfree(dev);
295
296 return 0;
297}
298
299static struct of_device_id zmii_match[] =
300{
301 {
302 .compatible = "ibm,zmii",
303 },
304 /* For backward compat with old DT */
305 {
306 .type = "emac-zmii",
307 },
308 {},
309};
310
311static struct platform_driver zmii_driver = {
312 .driver = {
313 .name = "emac-zmii",
314 .owner = THIS_MODULE,
315 .of_match_table = zmii_match,
316 },
317 .probe = zmii_probe,
318 .remove = zmii_remove,
319};
320
321int __init zmii_init(void)
322{
323 return platform_driver_register(&zmii_driver);
324}
325
326void zmii_exit(void)
327{
328 platform_driver_unregister(&zmii_driver);
329}
1/*
2 * drivers/net/ethernet/ibm/emac/zmii.c
3 *
4 * Driver for PowerPC 4xx on-chip ethernet controller, ZMII 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 * Armin Kuster <akuster@mvista.com>
16 * Copyright 2001 MontaVista Softare 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 <linux/of_address.h>
28#include <asm/io.h>
29
30#include "emac.h"
31#include "core.h"
32
33/* ZMIIx_FER */
34#define ZMII_FER_MDI(idx) (0x80000000 >> ((idx) * 4))
35#define ZMII_FER_MDI_ALL (ZMII_FER_MDI(0) | ZMII_FER_MDI(1) | \
36 ZMII_FER_MDI(2) | ZMII_FER_MDI(3))
37
38#define ZMII_FER_SMII(idx) (0x40000000 >> ((idx) * 4))
39#define ZMII_FER_RMII(idx) (0x20000000 >> ((idx) * 4))
40#define ZMII_FER_MII(idx) (0x10000000 >> ((idx) * 4))
41
42/* ZMIIx_SSR */
43#define ZMII_SSR_SCI(idx) (0x40000000 >> ((idx) * 4))
44#define ZMII_SSR_FSS(idx) (0x20000000 >> ((idx) * 4))
45#define ZMII_SSR_SP(idx) (0x10000000 >> ((idx) * 4))
46
47/* ZMII only supports MII, RMII and SMII
48 * we also support autodetection for backward compatibility
49 */
50static inline int zmii_valid_mode(int mode)
51{
52 return mode == PHY_MODE_MII ||
53 mode == PHY_MODE_RMII ||
54 mode == PHY_MODE_SMII ||
55 mode == PHY_MODE_NA;
56}
57
58static inline const char *zmii_mode_name(int mode)
59{
60 switch (mode) {
61 case PHY_MODE_MII:
62 return "MII";
63 case PHY_MODE_RMII:
64 return "RMII";
65 case PHY_MODE_SMII:
66 return "SMII";
67 default:
68 BUG();
69 }
70}
71
72static inline u32 zmii_mode_mask(int mode, int input)
73{
74 switch (mode) {
75 case PHY_MODE_MII:
76 return ZMII_FER_MII(input);
77 case PHY_MODE_RMII:
78 return ZMII_FER_RMII(input);
79 case PHY_MODE_SMII:
80 return ZMII_FER_SMII(input);
81 default:
82 return 0;
83 }
84}
85
86int zmii_attach(struct platform_device *ofdev, int input, int *mode)
87{
88 struct zmii_instance *dev = platform_get_drvdata(ofdev);
89 struct zmii_regs __iomem *p = dev->base;
90
91 ZMII_DBG(dev, "init(%d, %d)" NL, input, *mode);
92
93 if (!zmii_valid_mode(*mode)) {
94 /* Probably an EMAC connected to RGMII,
95 * but it still may need ZMII for MDIO so
96 * we don't fail here.
97 */
98 dev->users++;
99 return 0;
100 }
101
102 mutex_lock(&dev->lock);
103
104 /* Autodetect ZMII mode if not specified.
105 * This is only for backward compatibility with the old driver.
106 * Please, always specify PHY mode in your board port to avoid
107 * any surprises.
108 */
109 if (dev->mode == PHY_MODE_NA) {
110 if (*mode == PHY_MODE_NA) {
111 u32 r = dev->fer_save;
112
113 ZMII_DBG(dev, "autodetecting mode, FER = 0x%08x" NL, r);
114
115 if (r & (ZMII_FER_MII(0) | ZMII_FER_MII(1)))
116 dev->mode = PHY_MODE_MII;
117 else if (r & (ZMII_FER_RMII(0) | ZMII_FER_RMII(1)))
118 dev->mode = PHY_MODE_RMII;
119 else
120 dev->mode = PHY_MODE_SMII;
121 } else
122 dev->mode = *mode;
123
124 printk(KERN_NOTICE "%s: bridge in %s mode\n",
125 ofdev->dev.of_node->full_name,
126 zmii_mode_name(dev->mode));
127 } else {
128 /* All inputs must use the same mode */
129 if (*mode != PHY_MODE_NA && *mode != dev->mode) {
130 printk(KERN_ERR
131 "%s: invalid mode %d specified for input %d\n",
132 ofdev->dev.of_node->full_name, *mode, input);
133 mutex_unlock(&dev->lock);
134 return -EINVAL;
135 }
136 }
137
138 /* Report back correct PHY mode,
139 * it may be used during PHY initialization.
140 */
141 *mode = dev->mode;
142
143 /* Enable this input */
144 out_be32(&p->fer, in_be32(&p->fer) | zmii_mode_mask(dev->mode, input));
145 ++dev->users;
146
147 mutex_unlock(&dev->lock);
148
149 return 0;
150}
151
152void zmii_get_mdio(struct platform_device *ofdev, int input)
153{
154 struct zmii_instance *dev = platform_get_drvdata(ofdev);
155 u32 fer;
156
157 ZMII_DBG2(dev, "get_mdio(%d)" NL, input);
158
159 mutex_lock(&dev->lock);
160
161 fer = in_be32(&dev->base->fer) & ~ZMII_FER_MDI_ALL;
162 out_be32(&dev->base->fer, fer | ZMII_FER_MDI(input));
163}
164
165void zmii_put_mdio(struct platform_device *ofdev, int input)
166{
167 struct zmii_instance *dev = platform_get_drvdata(ofdev);
168
169 ZMII_DBG2(dev, "put_mdio(%d)" NL, input);
170 mutex_unlock(&dev->lock);
171}
172
173
174void zmii_set_speed(struct platform_device *ofdev, int input, int speed)
175{
176 struct zmii_instance *dev = platform_get_drvdata(ofdev);
177 u32 ssr;
178
179 mutex_lock(&dev->lock);
180
181 ssr = in_be32(&dev->base->ssr);
182
183 ZMII_DBG(dev, "speed(%d, %d)" NL, input, speed);
184
185 if (speed == SPEED_100)
186 ssr |= ZMII_SSR_SP(input);
187 else
188 ssr &= ~ZMII_SSR_SP(input);
189
190 out_be32(&dev->base->ssr, ssr);
191
192 mutex_unlock(&dev->lock);
193}
194
195void zmii_detach(struct platform_device *ofdev, int input)
196{
197 struct zmii_instance *dev = platform_get_drvdata(ofdev);
198
199 BUG_ON(!dev || dev->users == 0);
200
201 mutex_lock(&dev->lock);
202
203 ZMII_DBG(dev, "detach(%d)" NL, input);
204
205 /* Disable this input */
206 out_be32(&dev->base->fer,
207 in_be32(&dev->base->fer) & ~zmii_mode_mask(dev->mode, input));
208
209 --dev->users;
210
211 mutex_unlock(&dev->lock);
212}
213
214int zmii_get_regs_len(struct platform_device *ofdev)
215{
216 return sizeof(struct emac_ethtool_regs_subhdr) +
217 sizeof(struct zmii_regs);
218}
219
220void *zmii_dump_regs(struct platform_device *ofdev, void *buf)
221{
222 struct zmii_instance *dev = platform_get_drvdata(ofdev);
223 struct emac_ethtool_regs_subhdr *hdr = buf;
224 struct zmii_regs *regs = (struct zmii_regs *)(hdr + 1);
225
226 hdr->version = 0;
227 hdr->index = 0; /* for now, are there chips with more than one
228 * zmii ? if yes, then we'll add a cell_index
229 * like we do for emac
230 */
231 memcpy_fromio(regs, dev->base, sizeof(struct zmii_regs));
232 return regs + 1;
233}
234
235static int zmii_probe(struct platform_device *ofdev)
236{
237 struct device_node *np = ofdev->dev.of_node;
238 struct zmii_instance *dev;
239 struct resource regs;
240 int rc;
241
242 rc = -ENOMEM;
243 dev = kzalloc(sizeof(struct zmii_instance), GFP_KERNEL);
244 if (dev == NULL)
245 goto err_gone;
246
247 mutex_init(&dev->lock);
248 dev->ofdev = ofdev;
249 dev->mode = PHY_MODE_NA;
250
251 rc = -ENXIO;
252 if (of_address_to_resource(np, 0, ®s)) {
253 printk(KERN_ERR "%s: Can't get registers address\n",
254 np->full_name);
255 goto err_free;
256 }
257
258 rc = -ENOMEM;
259 dev->base = (struct zmii_regs __iomem *)ioremap(regs.start,
260 sizeof(struct zmii_regs));
261 if (dev->base == NULL) {
262 printk(KERN_ERR "%s: Can't map device registers!\n",
263 np->full_name);
264 goto err_free;
265 }
266
267 /* We may need FER value for autodetection later */
268 dev->fer_save = in_be32(&dev->base->fer);
269
270 /* Disable all inputs by default */
271 out_be32(&dev->base->fer, 0);
272
273 printk(KERN_INFO
274 "ZMII %s initialized\n", ofdev->dev.of_node->full_name);
275 wmb();
276 platform_set_drvdata(ofdev, dev);
277
278 return 0;
279
280 err_free:
281 kfree(dev);
282 err_gone:
283 return rc;
284}
285
286static int zmii_remove(struct platform_device *ofdev)
287{
288 struct zmii_instance *dev = platform_get_drvdata(ofdev);
289
290 WARN_ON(dev->users != 0);
291
292 iounmap(dev->base);
293 kfree(dev);
294
295 return 0;
296}
297
298static const struct of_device_id zmii_match[] =
299{
300 {
301 .compatible = "ibm,zmii",
302 },
303 /* For backward compat with old DT */
304 {
305 .type = "emac-zmii",
306 },
307 {},
308};
309
310static struct platform_driver zmii_driver = {
311 .driver = {
312 .name = "emac-zmii",
313 .of_match_table = zmii_match,
314 },
315 .probe = zmii_probe,
316 .remove = zmii_remove,
317};
318
319int __init zmii_init(void)
320{
321 return platform_driver_register(&zmii_driver);
322}
323
324void zmii_exit(void)
325{
326 platform_driver_unregister(&zmii_driver);
327}