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1d3bb996 DG |
1 | /* |
2 | * drivers/net/ibm_newemac/rgmii.c | |
3 | * | |
4 | * Driver for PowerPC 4xx on-chip ethernet controller, RGMII bridge support. | |
5 | * | |
17cf803a BH |
6 | * Copyright 2007 Benjamin Herrenschmidt, IBM Corp. |
7 | * <benh@kernel.crashing.org> | |
8 | * | |
9 | * Based on the arch/ppc version of the driver: | |
10 | * | |
1d3bb996 DG |
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/kernel.h> | |
25 | #include <linux/ethtool.h> | |
26 | #include <asm/io.h> | |
27 | ||
28 | #include "emac.h" | |
29 | #include "debug.h" | |
30 | ||
31 | // XXX FIXME: Axon seems to support a subset of the RGMII, we | |
32 | // thus need to take that into account and possibly change some | |
33 | // of the bit settings below that don't seem to quite match the | |
34 | // AXON spec | |
35 | ||
36 | /* RGMIIx_FER */ | |
37 | #define RGMII_FER_MASK(idx) (0x7 << ((idx) * 4)) | |
38 | #define RGMII_FER_RTBI(idx) (0x4 << ((idx) * 4)) | |
39 | #define RGMII_FER_RGMII(idx) (0x5 << ((idx) * 4)) | |
40 | #define RGMII_FER_TBI(idx) (0x6 << ((idx) * 4)) | |
41 | #define RGMII_FER_GMII(idx) (0x7 << ((idx) * 4)) | |
004ea683 | 42 | #define RGMII_FER_MII(idx) RGMII_FER_GMII(idx) |
1d3bb996 DG |
43 | |
44 | /* RGMIIx_SSR */ | |
45 | #define RGMII_SSR_MASK(idx) (0x7 << ((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 */ | |
50 | static inline int rgmii_valid_mode(int phy_mode) | |
51 | { | |
52 | return phy_mode == PHY_MODE_GMII || | |
004ea683 | 53 | phy_mode == PHY_MODE_MII || |
1d3bb996 DG |
54 | phy_mode == PHY_MODE_RGMII || |
55 | phy_mode == PHY_MODE_TBI || | |
56 | phy_mode == PHY_MODE_RTBI; | |
57 | } | |
58 | ||
59 | static inline const char *rgmii_mode_name(int mode) | |
60 | { | |
61 | switch (mode) { | |
62 | case PHY_MODE_RGMII: | |
63 | return "RGMII"; | |
64 | case PHY_MODE_TBI: | |
65 | return "TBI"; | |
66 | case PHY_MODE_GMII: | |
67 | return "GMII"; | |
004ea683 GE |
68 | case PHY_MODE_MII: |
69 | return "MII"; | |
1d3bb996 DG |
70 | case PHY_MODE_RTBI: |
71 | return "RTBI"; | |
72 | default: | |
73 | BUG(); | |
74 | } | |
75 | } | |
76 | ||
77 | static inline u32 rgmii_mode_mask(int mode, int input) | |
78 | { | |
79 | switch (mode) { | |
80 | case PHY_MODE_RGMII: | |
81 | return RGMII_FER_RGMII(input); | |
82 | case PHY_MODE_TBI: | |
83 | return RGMII_FER_TBI(input); | |
84 | case PHY_MODE_GMII: | |
85 | return RGMII_FER_GMII(input); | |
004ea683 GE |
86 | case PHY_MODE_MII: |
87 | return RGMII_FER_MII(input); | |
1d3bb996 DG |
88 | case PHY_MODE_RTBI: |
89 | return RGMII_FER_RTBI(input); | |
90 | default: | |
91 | BUG(); | |
92 | } | |
93 | } | |
94 | ||
95 | int __devinit rgmii_attach(struct of_device *ofdev, int input, int mode) | |
96 | { | |
97 | struct rgmii_instance *dev = dev_get_drvdata(&ofdev->dev); | |
eb4d84f1 | 98 | struct rgmii_regs __iomem *p = dev->base; |
1d3bb996 DG |
99 | |
100 | RGMII_DBG(dev, "attach(%d)" NL, input); | |
101 | ||
102 | /* Check if we need to attach to a RGMII */ | |
103 | if (input < 0 || !rgmii_valid_mode(mode)) { | |
104 | printk(KERN_ERR "%s: unsupported settings !\n", | |
105 | ofdev->node->full_name); | |
106 | return -ENODEV; | |
107 | } | |
108 | ||
109 | mutex_lock(&dev->lock); | |
110 | ||
111 | /* Enable this input */ | |
112 | out_be32(&p->fer, in_be32(&p->fer) | rgmii_mode_mask(mode, input)); | |
113 | ||
114 | printk(KERN_NOTICE "%s: input %d in %s mode\n", | |
115 | ofdev->node->full_name, input, rgmii_mode_name(mode)); | |
116 | ||
117 | ++dev->users; | |
118 | ||
119 | mutex_unlock(&dev->lock); | |
120 | ||
121 | return 0; | |
122 | } | |
123 | ||
124 | void rgmii_set_speed(struct of_device *ofdev, int input, int speed) | |
125 | { | |
126 | struct rgmii_instance *dev = dev_get_drvdata(&ofdev->dev); | |
eb4d84f1 | 127 | struct rgmii_regs __iomem *p = dev->base; |
1d3bb996 DG |
128 | u32 ssr; |
129 | ||
130 | mutex_lock(&dev->lock); | |
131 | ||
132 | ssr = in_be32(&p->ssr) & ~RGMII_SSR_MASK(input); | |
133 | ||
134 | RGMII_DBG(dev, "speed(%d, %d)" NL, input, speed); | |
135 | ||
136 | if (speed == SPEED_1000) | |
137 | ssr |= RGMII_SSR_1000(input); | |
138 | else if (speed == SPEED_100) | |
139 | ssr |= RGMII_SSR_100(input); | |
140 | ||
141 | out_be32(&p->ssr, ssr); | |
142 | ||
143 | mutex_unlock(&dev->lock); | |
144 | } | |
145 | ||
146 | void rgmii_get_mdio(struct of_device *ofdev, int input) | |
147 | { | |
148 | struct rgmii_instance *dev = dev_get_drvdata(&ofdev->dev); | |
eb4d84f1 | 149 | struct rgmii_regs __iomem *p = dev->base; |
1d3bb996 DG |
150 | u32 fer; |
151 | ||
152 | RGMII_DBG2(dev, "get_mdio(%d)" NL, input); | |
153 | ||
1f57877a | 154 | if (!(dev->flags & EMAC_RGMII_FLAG_HAS_MDIO)) |
1d3bb996 DG |
155 | return; |
156 | ||
157 | mutex_lock(&dev->lock); | |
158 | ||
159 | fer = in_be32(&p->fer); | |
160 | fer |= 0x00080000u >> input; | |
161 | out_be32(&p->fer, fer); | |
162 | (void)in_be32(&p->fer); | |
163 | ||
164 | DBG2(dev, " fer = 0x%08x\n", fer); | |
165 | } | |
166 | ||
167 | void rgmii_put_mdio(struct of_device *ofdev, int input) | |
168 | { | |
169 | struct rgmii_instance *dev = dev_get_drvdata(&ofdev->dev); | |
eb4d84f1 | 170 | struct rgmii_regs __iomem *p = dev->base; |
1d3bb996 DG |
171 | u32 fer; |
172 | ||
173 | RGMII_DBG2(dev, "put_mdio(%d)" NL, input); | |
174 | ||
1f57877a | 175 | if (!(dev->flags & EMAC_RGMII_FLAG_HAS_MDIO)) |
1d3bb996 DG |
176 | return; |
177 | ||
178 | fer = in_be32(&p->fer); | |
179 | fer &= ~(0x00080000u >> input); | |
180 | out_be32(&p->fer, fer); | |
181 | (void)in_be32(&p->fer); | |
182 | ||
183 | DBG2(dev, " fer = 0x%08x\n", fer); | |
184 | ||
185 | mutex_unlock(&dev->lock); | |
186 | } | |
187 | ||
51d4a1cc | 188 | void rgmii_detach(struct of_device *ofdev, int input) |
1d3bb996 DG |
189 | { |
190 | struct rgmii_instance *dev = dev_get_drvdata(&ofdev->dev); | |
eb4d84f1 | 191 | struct rgmii_regs __iomem *p = dev->base; |
1d3bb996 DG |
192 | |
193 | mutex_lock(&dev->lock); | |
194 | ||
195 | BUG_ON(!dev || dev->users == 0); | |
196 | ||
197 | RGMII_DBG(dev, "detach(%d)" NL, input); | |
198 | ||
199 | /* Disable this input */ | |
200 | out_be32(&p->fer, in_be32(&p->fer) & ~RGMII_FER_MASK(input)); | |
201 | ||
202 | --dev->users; | |
203 | ||
204 | mutex_unlock(&dev->lock); | |
205 | } | |
206 | ||
207 | int rgmii_get_regs_len(struct of_device *ofdev) | |
208 | { | |
209 | return sizeof(struct emac_ethtool_regs_subhdr) + | |
210 | sizeof(struct rgmii_regs); | |
211 | } | |
212 | ||
213 | void *rgmii_dump_regs(struct of_device *ofdev, void *buf) | |
214 | { | |
215 | struct rgmii_instance *dev = dev_get_drvdata(&ofdev->dev); | |
216 | struct emac_ethtool_regs_subhdr *hdr = buf; | |
217 | struct rgmii_regs *regs = (struct rgmii_regs *)(hdr + 1); | |
218 | ||
219 | hdr->version = 0; | |
220 | hdr->index = 0; /* for now, are there chips with more than one | |
221 | * rgmii ? if yes, then we'll add a cell_index | |
222 | * like we do for emac | |
223 | */ | |
224 | memcpy_fromio(regs, dev->base, sizeof(struct rgmii_regs)); | |
225 | return regs + 1; | |
226 | } | |
227 | ||
228 | ||
229 | static int __devinit rgmii_probe(struct of_device *ofdev, | |
230 | const struct of_device_id *match) | |
231 | { | |
232 | struct device_node *np = ofdev->node; | |
233 | struct rgmii_instance *dev; | |
234 | struct resource regs; | |
235 | int rc; | |
236 | ||
237 | rc = -ENOMEM; | |
238 | dev = kzalloc(sizeof(struct rgmii_instance), GFP_KERNEL); | |
239 | if (dev == NULL) { | |
240 | printk(KERN_ERR "%s: could not allocate RGMII device!\n", | |
241 | np->full_name); | |
242 | goto err_gone; | |
243 | } | |
244 | ||
245 | mutex_init(&dev->lock); | |
246 | dev->ofdev = ofdev; | |
247 | ||
248 | rc = -ENXIO; | |
249 | if (of_address_to_resource(np, 0, ®s)) { | |
250 | printk(KERN_ERR "%s: Can't get registers address\n", | |
251 | np->full_name); | |
252 | goto err_free; | |
253 | } | |
254 | ||
255 | rc = -ENOMEM; | |
eb4d84f1 | 256 | dev->base = (struct rgmii_regs __iomem *)ioremap(regs.start, |
1d3bb996 DG |
257 | sizeof(struct rgmii_regs)); |
258 | if (dev->base == NULL) { | |
259 | printk(KERN_ERR "%s: Can't map device registers!\n", | |
260 | np->full_name); | |
261 | goto err_free; | |
262 | } | |
263 | ||
1f57877a BH |
264 | /* Check for RGMII flags */ |
265 | if (of_get_property(ofdev->node, "has-mdio", NULL)) | |
266 | dev->flags |= EMAC_RGMII_FLAG_HAS_MDIO; | |
267 | ||
268 | /* CAB lacks the right properties, fix this up */ | |
97be91c1 | 269 | if (of_device_is_compatible(ofdev->node, "ibm,rgmii-axon")) |
1f57877a | 270 | dev->flags |= EMAC_RGMII_FLAG_HAS_MDIO; |
1d3bb996 DG |
271 | |
272 | DBG2(dev, " Boot FER = 0x%08x, SSR = 0x%08x\n", | |
273 | in_be32(&dev->base->fer), in_be32(&dev->base->ssr)); | |
274 | ||
275 | /* Disable all inputs by default */ | |
276 | out_be32(&dev->base->fer, 0); | |
277 | ||
278 | printk(KERN_INFO | |
1f57877a BH |
279 | "RGMII %s initialized with%s MDIO support\n", |
280 | ofdev->node->full_name, | |
281 | (dev->flags & EMAC_RGMII_FLAG_HAS_MDIO) ? "" : "out"); | |
1d3bb996 DG |
282 | |
283 | wmb(); | |
284 | dev_set_drvdata(&ofdev->dev, dev); | |
285 | ||
286 | return 0; | |
287 | ||
288 | err_free: | |
289 | kfree(dev); | |
290 | err_gone: | |
291 | return rc; | |
292 | } | |
293 | ||
294 | static int __devexit rgmii_remove(struct of_device *ofdev) | |
295 | { | |
296 | struct rgmii_instance *dev = dev_get_drvdata(&ofdev->dev); | |
297 | ||
298 | dev_set_drvdata(&ofdev->dev, NULL); | |
299 | ||
300 | WARN_ON(dev->users != 0); | |
301 | ||
302 | iounmap(dev->base); | |
303 | kfree(dev); | |
304 | ||
305 | return 0; | |
306 | } | |
307 | ||
308 | static struct of_device_id rgmii_match[] = | |
309 | { | |
310 | { | |
1d3bb996 DG |
311 | .compatible = "ibm,rgmii", |
312 | }, | |
313 | { | |
314 | .type = "emac-rgmii", | |
315 | }, | |
316 | {}, | |
317 | }; | |
318 | ||
319 | static struct of_platform_driver rgmii_driver = { | |
320 | .name = "emac-rgmii", | |
321 | .match_table = rgmii_match, | |
322 | ||
323 | .probe = rgmii_probe, | |
324 | .remove = rgmii_remove, | |
325 | }; | |
326 | ||
327 | int __init rgmii_init(void) | |
328 | { | |
329 | return of_register_platform_driver(&rgmii_driver); | |
330 | } | |
331 | ||
332 | void rgmii_exit(void) | |
333 | { | |
334 | of_unregister_platform_driver(&rgmii_driver); | |
335 | } |