1 /*
2 * drivers/net/ibm_newemac/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/kernel.h>
25 #include <linux/ethtool.h>
26 #include <asm/io.h>
27
28 #include "emac.h"
29 #include "core.h"
30
31 /* ZMIIx_FER */
32 #define ZMII_FER_MDI(idx) (0x80000000 >> ((idx) * 4))
33 #define ZMII_FER_MDI_ALL (ZMII_FER_MDI(0) | ZMII_FER_MDI(1) | \
34 ZMII_FER_MDI(2) | ZMII_FER_MDI(3))
35
36 #define ZMII_FER_SMII(idx) (0x40000000 >> ((idx) * 4))
37 #define ZMII_FER_RMII(idx) (0x20000000 >> ((idx) * 4))
38 #define ZMII_FER_MII(idx) (0x10000000 >> ((idx) * 4))
39
40 /* ZMIIx_SSR */
41 #define ZMII_SSR_SCI(idx) (0x40000000 >> ((idx) * 4))
42 #define ZMII_SSR_FSS(idx) (0x20000000 >> ((idx) * 4))
43 #define ZMII_SSR_SP(idx) (0x10000000 >> ((idx) * 4))
44
45 /* ZMII only supports MII, RMII and SMII
46 * we also support autodetection for backward compatibility
47 */
48 static inline int zmii_valid_mode(int mode)
49 {
50 return mode == PHY_MODE_MII ||
51 mode == PHY_MODE_RMII ||
52 mode == PHY_MODE_SMII ||
53 mode == PHY_MODE_NA;
54 }
55
56 static inline const char *zmii_mode_name(int mode)
57 {
58 switch (mode) {
59 case PHY_MODE_MII:
60 return "MII";
61 case PHY_MODE_RMII:
62 return "RMII";
63 case PHY_MODE_SMII:
64 return "SMII";
65 default:
66 BUG();
67 }
68 }
69
70 static inline u32 zmii_mode_mask(int mode, int input)
71 {
72 switch (mode) {
73 case PHY_MODE_MII:
74 return ZMII_FER_MII(input);
75 case PHY_MODE_RMII:
76 return ZMII_FER_RMII(input);
77 case PHY_MODE_SMII:
78 return ZMII_FER_SMII(input);
79 default:
80 return 0;
81 }
82 }
83
84 int __devinit zmii_attach(struct of_device *ofdev, int input, int *mode)
85 {
86 struct zmii_instance *dev = dev_get_drvdata(&ofdev->dev);
87 struct zmii_regs __iomem *p = dev->base;
88
89 ZMII_DBG(dev, "init(%d, %d)" NL, input, *mode);
90
91 if (!zmii_valid_mode(*mode)) {
92 /* Probably an EMAC connected to RGMII,
93 * but it still may need ZMII for MDIO so
94 * we don't fail here.
95 */
96 dev->users++;
97 return 0;
98 }
99
100 mutex_lock(&dev->lock);
101
102 /* Autodetect ZMII mode if not specified.
103 * This is only for backward compatibility with the old driver.
104 * Please, always specify PHY mode in your board port to avoid
105 * any surprises.
106 */
107 if (dev->mode == PHY_MODE_NA) {
108 if (*mode == PHY_MODE_NA) {
109 u32 r = dev->fer_save;
110
111 ZMII_DBG(dev, "autodetecting mode, FER = 0x%08x" NL, r);
112
113 if (r & (ZMII_FER_MII(0) | ZMII_FER_MII(1)))
114 dev->mode = PHY_MODE_MII;
115 else if (r & (ZMII_FER_RMII(0) | ZMII_FER_RMII(1)))
116 dev->mode = PHY_MODE_RMII;
117 else
118 dev->mode = PHY_MODE_SMII;
119 } else
120 dev->mode = *mode;
121
122 printk(KERN_NOTICE "%s: bridge in %s mode\n",
123 ofdev->node->full_name, zmii_mode_name(dev->mode));
124 } else {
125 /* All inputs must use the same mode */
126 if (*mode != PHY_MODE_NA && *mode != dev->mode) {
127 printk(KERN_ERR
128 "%s: invalid mode %d specified for input %d\n",
129 ofdev->node->full_name, *mode, input);
130 mutex_unlock(&dev->lock);
131 return -EINVAL;
132 }
133 }
134
135 /* Report back correct PHY mode,
136 * it may be used during PHY initialization.
137 */
138 *mode = dev->mode;
139
140 /* Enable this input */
141 out_be32(&p->fer, in_be32(&p->fer) | zmii_mode_mask(dev->mode, input));
142 ++dev->users;
143
144 mutex_unlock(&dev->lock);
145
146 return 0;
147 }
148
149 void zmii_get_mdio(struct of_device *ofdev, int input)
150 {
151 struct zmii_instance *dev = dev_get_drvdata(&ofdev->dev);
152 u32 fer;
153
154 ZMII_DBG2(dev, "get_mdio(%d)" NL, input);
155
156 mutex_lock(&dev->lock);
157
158 fer = in_be32(&dev->base->fer) & ~ZMII_FER_MDI_ALL;
159 out_be32(&dev->base->fer, fer | ZMII_FER_MDI(input));
160 }
161
162 void zmii_put_mdio(struct of_device *ofdev, int input)
163 {
164 struct zmii_instance *dev = dev_get_drvdata(&ofdev->dev);
165
166 ZMII_DBG2(dev, "put_mdio(%d)" NL, input);
167 mutex_unlock(&dev->lock);
168 }
169
170
171 void zmii_set_speed(struct of_device *ofdev, int input, int speed)
172 {
173 struct zmii_instance *dev = dev_get_drvdata(&ofdev->dev);
174 u32 ssr;
175
176 mutex_lock(&dev->lock);
177
178 ssr = in_be32(&dev->base->ssr);
179
180 ZMII_DBG(dev, "speed(%d, %d)" NL, input, speed);
181
182 if (speed == SPEED_100)
183 ssr |= ZMII_SSR_SP(input);
184 else
185 ssr &= ~ZMII_SSR_SP(input);
186
187 out_be32(&dev->base->ssr, ssr);
188
189 mutex_unlock(&dev->lock);
190 }
191
192 void zmii_detach(struct of_device *ofdev, int input)
193 {
194 struct zmii_instance *dev = dev_get_drvdata(&ofdev->dev);
195
196 BUG_ON(!dev || dev->users == 0);
197
198 mutex_lock(&dev->lock);
199
200 ZMII_DBG(dev, "detach(%d)" NL, input);
201
202 /* Disable this input */
203 out_be32(&dev->base->fer,
204 in_be32(&dev->base->fer) & ~zmii_mode_mask(dev->mode, input));
205
206 --dev->users;
207
208 mutex_unlock(&dev->lock);
209 }
210
211 int zmii_get_regs_len(struct of_device *ofdev)
212 {
213 return sizeof(struct emac_ethtool_regs_subhdr) +
214 sizeof(struct zmii_regs);
215 }
216
217 void *zmii_dump_regs(struct of_device *ofdev, void *buf)
218 {
219 struct zmii_instance *dev = dev_get_drvdata(&ofdev->dev);
220 struct emac_ethtool_regs_subhdr *hdr = buf;
221 struct zmii_regs *regs = (struct zmii_regs *)(hdr + 1);
222
223 hdr->version = 0;
224 hdr->index = 0; /* for now, are there chips with more than one
225 * zmii ? if yes, then we'll add a cell_index
226 * like we do for emac
227 */
228 memcpy_fromio(regs, dev->base, sizeof(struct zmii_regs));
229 return regs + 1;
230 }
231
232 static int __devinit zmii_probe(struct of_device *ofdev,
233 const struct of_device_id *match)
234 {
235 struct device_node *np = ofdev->node;
236 struct zmii_instance *dev;
237 struct resource regs;
238 int rc;
239
240 rc = -ENOMEM;
241 dev = kzalloc(sizeof(struct zmii_instance), GFP_KERNEL);
242 if (dev == NULL) {
243 printk(KERN_ERR "%s: could not allocate ZMII device!\n",
244 np->full_name);
245 goto err_gone;
246 }
247
248 mutex_init(&dev->lock);
249 dev->ofdev = ofdev;
250 dev->mode = PHY_MODE_NA;
251
252 rc = -ENXIO;
253 if (of_address_to_resource(np, 0, ®s)) {
254 printk(KERN_ERR "%s: Can't get registers address\n",
255 np->full_name);
256 goto err_free;
257 }
258
259 rc = -ENOMEM;
260 dev->base = (struct zmii_regs __iomem *)ioremap(regs.start,
261 sizeof(struct zmii_regs));
262 if (dev->base == NULL) {
263 printk(KERN_ERR "%s: Can't map device registers!\n",
264 np->full_name);
265 goto err_free;
266 }
267
268 /* We may need FER value for autodetection later */
269 dev->fer_save = in_be32(&dev->base->fer);
270
271 /* Disable all inputs by default */
272 out_be32(&dev->base->fer, 0);
273
274 printk(KERN_INFO
275 "ZMII %s initialized\n", ofdev->node->full_name);
276 wmb();
277 dev_set_drvdata(&ofdev->dev, dev);
278
279 return 0;
280
281 err_free:
282 kfree(dev);
283 err_gone:
284 return rc;
285 }
286
287 static int __devexit zmii_remove(struct of_device *ofdev)
288 {
289 struct zmii_instance *dev = dev_get_drvdata(&ofdev->dev);
290
291 dev_set_drvdata(&ofdev->dev, NULL);
292
293 WARN_ON(dev->users != 0);
294
295 iounmap(dev->base);
296 kfree(dev);
297
298 return 0;
299 }
300
301 static struct of_device_id zmii_match[] =
302 {
303 {
304 .compatible = "ibm,zmii",
305 },
306 /* For backward compat with old DT */
307 {
308 .type = "emac-zmii",
309 },
310 {},
311 };
312
313 static struct of_platform_driver zmii_driver = {
314 .name = "emac-zmii",
315 .match_table = zmii_match,
316
317 .probe = zmii_probe,
318 .remove = zmii_remove,
319 };
320
321 int __init zmii_init(void)
322 {
323 return of_register_platform_driver(&zmii_driver);
324 }
325
326 void zmii_exit(void)
327 {
328 of_unregister_platform_driver(&zmii_driver);
329 }
330
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