1 /*
2 * drivers/net/ibm_newemac/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 */
rgmii_valid_mode(int phy_mode)51 static 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
rgmii_mode_name(int mode)60 static 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
rgmii_mode_mask(int mode,int input)78 static 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
rgmii_attach(struct platform_device * ofdev,int input,int mode)96 int __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
rgmii_set_speed(struct platform_device * ofdev,int input,int speed)125 void 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
rgmii_get_mdio(struct platform_device * ofdev,int input)147 void 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
rgmii_put_mdio(struct platform_device * ofdev,int input)168 void 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
rgmii_detach(struct platform_device * ofdev,int input)189 void 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
rgmii_get_regs_len(struct platform_device * ofdev)209 int rgmii_get_regs_len(struct platform_device *ofdev)
210 {
211 return sizeof(struct emac_ethtool_regs_subhdr) +
212 sizeof(struct rgmii_regs);
213 }
214
rgmii_dump_regs(struct platform_device * ofdev,void * buf)215 void *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
rgmii_probe(struct platform_device * ofdev)231 static 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 printk(KERN_ERR "%s: could not allocate RGMII device!\n",
242 np->full_name);
243 goto err_gone;
244 }
245
246 mutex_init(&dev->lock);
247 dev->ofdev = ofdev;
248
249 rc = -ENXIO;
250 if (of_address_to_resource(np, 0, ®s)) {
251 printk(KERN_ERR "%s: Can't get registers address\n",
252 np->full_name);
253 goto err_free;
254 }
255
256 rc = -ENOMEM;
257 dev->base = (struct rgmii_regs __iomem *)ioremap(regs.start,
258 sizeof(struct rgmii_regs));
259 if (dev->base == NULL) {
260 printk(KERN_ERR "%s: Can't map device registers!\n",
261 np->full_name);
262 goto err_free;
263 }
264
265 /* Check for RGMII flags */
266 if (of_get_property(ofdev->dev.of_node, "has-mdio", NULL))
267 dev->flags |= EMAC_RGMII_FLAG_HAS_MDIO;
268
269 /* CAB lacks the right properties, fix this up */
270 if (of_device_is_compatible(ofdev->dev.of_node, "ibm,rgmii-axon"))
271 dev->flags |= EMAC_RGMII_FLAG_HAS_MDIO;
272
273 DBG2(dev, " Boot FER = 0x%08x, SSR = 0x%08x\n",
274 in_be32(&dev->base->fer), in_be32(&dev->base->ssr));
275
276 /* Disable all inputs by default */
277 out_be32(&dev->base->fer, 0);
278
279 printk(KERN_INFO
280 "RGMII %s initialized with%s MDIO support\n",
281 ofdev->dev.of_node->full_name,
282 (dev->flags & EMAC_RGMII_FLAG_HAS_MDIO) ? "" : "out");
283
284 wmb();
285 dev_set_drvdata(&ofdev->dev, dev);
286
287 return 0;
288
289 err_free:
290 kfree(dev);
291 err_gone:
292 return rc;
293 }
294
rgmii_remove(struct platform_device * ofdev)295 static int __devexit rgmii_remove(struct platform_device *ofdev)
296 {
297 struct rgmii_instance *dev = dev_get_drvdata(&ofdev->dev);
298
299 dev_set_drvdata(&ofdev->dev, NULL);
300
301 WARN_ON(dev->users != 0);
302
303 iounmap(dev->base);
304 kfree(dev);
305
306 return 0;
307 }
308
309 static struct of_device_id rgmii_match[] =
310 {
311 {
312 .compatible = "ibm,rgmii",
313 },
314 {
315 .type = "emac-rgmii",
316 },
317 {},
318 };
319
320 static struct platform_driver rgmii_driver = {
321 .driver = {
322 .name = "emac-rgmii",
323 .owner = THIS_MODULE,
324 .of_match_table = rgmii_match,
325 },
326 .probe = rgmii_probe,
327 .remove = rgmii_remove,
328 };
329
rgmii_init(void)330 int __init rgmii_init(void)
331 {
332 return platform_driver_register(&rgmii_driver);
333 }
334
rgmii_exit(void)335 void rgmii_exit(void)
336 {
337 platform_driver_unregister(&rgmii_driver);
338 }
339