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 */
zmii_valid_mode(int mode)49 static 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
zmii_mode_name(int mode)57 static 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
zmii_mode_mask(int mode,int input)71 static 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
zmii_attach(struct platform_device * ofdev,int input,int * mode)85 int __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
zmii_get_mdio(struct platform_device * ofdev,int input)151 void 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
zmii_put_mdio(struct platform_device * ofdev,int input)164 void 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
zmii_set_speed(struct platform_device * ofdev,int input,int speed)173 void 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
zmii_detach(struct platform_device * ofdev,int input)194 void 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
zmii_get_regs_len(struct platform_device * ofdev)213 int zmii_get_regs_len(struct platform_device *ofdev)
214 {
215 return sizeof(struct emac_ethtool_regs_subhdr) +
216 sizeof(struct zmii_regs);
217 }
218
zmii_dump_regs(struct platform_device * ofdev,void * buf)219 void *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
zmii_probe(struct platform_device * ofdev)234 static 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
zmii_remove(struct platform_device * ofdev)285 static 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
299 static 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
311 static 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
zmii_init(void)321 int __init zmii_init(void)
322 {
323 return platform_driver_register(&zmii_driver);
324 }
325
zmii_exit(void)326 void zmii_exit(void)
327 {
328 platform_driver_unregister(&zmii_driver);
329 }
330