tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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linux
1/*
2 * drivers/net/ibm_newemac/phy.c
3 *
4 * Driver for PowerPC 4xx on-chip ethernet controller, PHY support.
5 * Borrowed from sungem_phy.c, though I only kept the generic MII
6 * driver for now.
7 *
8 * This file should be shared with other drivers or eventually
9 * merged as the "low level" part of miilib
10 *
11 * Copyright 2007 Benjamin Herrenschmidt, IBM Corp.
12 * <benh@kernel.crashing.org>
13 *
14 * Based on the arch/ppc version of the driver:
15 *
16 * (c) 2003, Benjamin Herrenscmidt (benh@kernel.crashing.org)
17 * (c) 2004-2005, Eugene Surovegin <ebs@ebshome.net>
18 *
19 */
20#include <linux/module.h>
21#include <linux/kernel.h>
22#include <linux/types.h>
23#include <linux/netdevice.h>
24#include <linux/mii.h>
25#include <linux/ethtool.h>
26#include <linux/delay.h>
27
28#include "emac.h"
29#include "phy.h"
30
31static inline int phy_read(struct mii_phy *phy, int reg)
32{
33 return phy->mdio_read(phy->dev, phy->address, reg);
34}
35
36static inline void phy_write(struct mii_phy *phy, int reg, int val)
37{
38 phy->mdio_write(phy->dev, phy->address, reg, val);
39}
40
41int emac_mii_reset_phy(struct mii_phy *phy)
42{
43 int val;
44 int limit = 10000;
45
46 val = phy_read(phy, MII_BMCR);
47 val &= ~(BMCR_ISOLATE | BMCR_ANENABLE);
48 val |= BMCR_RESET;
49 phy_write(phy, MII_BMCR, val);
50
51 udelay(300);
52
53 while (limit--) {
54 val = phy_read(phy, MII_BMCR);
55 if (val >= 0 && (val & BMCR_RESET) == 0)
56 break;
57 udelay(10);
58 }
59 if ((val & BMCR_ISOLATE) && limit > 0)
60 phy_write(phy, MII_BMCR, val & ~BMCR_ISOLATE);
61
62 return limit <= 0;
63}
64
65static int genmii_setup_aneg(struct mii_phy *phy, u32 advertise)
66{
67 int ctl, adv;
68
69 phy->autoneg = AUTONEG_ENABLE;
70 phy->speed = SPEED_10;
71 phy->duplex = DUPLEX_HALF;
72 phy->pause = phy->asym_pause = 0;
73 phy->advertising = advertise;
74
75 ctl = phy_read(phy, MII_BMCR);
76 if (ctl < 0)
77 return ctl;
78 ctl &= ~(BMCR_FULLDPLX | BMCR_SPEED100 | BMCR_SPEED1000 | BMCR_ANENABLE);
79
80 /* First clear the PHY */
81 phy_write(phy, MII_BMCR, ctl);
82
83 /* Setup standard advertise */
84 adv = phy_read(phy, MII_ADVERTISE);
85 if (adv < 0)
86 return adv;
87 adv &= ~(ADVERTISE_ALL | ADVERTISE_100BASE4 | ADVERTISE_PAUSE_CAP |
88 ADVERTISE_PAUSE_ASYM);
89 if (advertise & ADVERTISED_10baseT_Half)
90 adv |= ADVERTISE_10HALF;
91 if (advertise & ADVERTISED_10baseT_Full)
92 adv |= ADVERTISE_10FULL;
93 if (advertise & ADVERTISED_100baseT_Half)
94 adv |= ADVERTISE_100HALF;
95 if (advertise & ADVERTISED_100baseT_Full)
96 adv |= ADVERTISE_100FULL;
97 if (advertise & ADVERTISED_Pause)
98 adv |= ADVERTISE_PAUSE_CAP;
99 if (advertise & ADVERTISED_Asym_Pause)
100 adv |= ADVERTISE_PAUSE_ASYM;
101 phy_write(phy, MII_ADVERTISE, adv);
102
103 if (phy->features &
104 (SUPPORTED_1000baseT_Full | SUPPORTED_1000baseT_Half)) {
105 adv = phy_read(phy, MII_CTRL1000);
106 if (adv < 0)
107 return adv;
108 adv &= ~(ADVERTISE_1000FULL | ADVERTISE_1000HALF);
109 if (advertise & ADVERTISED_1000baseT_Full)
110 adv |= ADVERTISE_1000FULL;
111 if (advertise & ADVERTISED_1000baseT_Half)
112 adv |= ADVERTISE_1000HALF;
113 phy_write(phy, MII_CTRL1000, adv);
114 }
115
116 /* Start/Restart aneg */
117 ctl = phy_read(phy, MII_BMCR);
118 ctl |= (BMCR_ANENABLE | BMCR_ANRESTART);
119 phy_write(phy, MII_BMCR, ctl);
120
121 return 0;
122}
123
124static int genmii_setup_forced(struct mii_phy *phy, int speed, int fd)
125{
126 int ctl;
127
128 phy->autoneg = AUTONEG_DISABLE;
129 phy->speed = speed;
130 phy->duplex = fd;
131 phy->pause = phy->asym_pause = 0;
132
133 ctl = phy_read(phy, MII_BMCR);
134 if (ctl < 0)
135 return ctl;
136 ctl &= ~(BMCR_FULLDPLX | BMCR_SPEED100 | BMCR_SPEED1000 | BMCR_ANENABLE);
137
138 /* First clear the PHY */
139 phy_write(phy, MII_BMCR, ctl | BMCR_RESET);
140
141 /* Select speed & duplex */
142 switch (speed) {
143 case SPEED_10:
144 break;
145 case SPEED_100:
146 ctl |= BMCR_SPEED100;
147 break;
148 case SPEED_1000:
149 ctl |= BMCR_SPEED1000;
150 break;
151 default:
152 return -EINVAL;
153 }
154 if (fd == DUPLEX_FULL)
155 ctl |= BMCR_FULLDPLX;
156 phy_write(phy, MII_BMCR, ctl);
157
158 return 0;
159}
160
161static int genmii_poll_link(struct mii_phy *phy)
162{
163 int status;
164
165 /* Clear latched value with dummy read */
166 phy_read(phy, MII_BMSR);
167 status = phy_read(phy, MII_BMSR);
168 if (status < 0 || (status & BMSR_LSTATUS) == 0)
169 return 0;
170 if (phy->autoneg == AUTONEG_ENABLE && !(status & BMSR_ANEGCOMPLETE))
171 return 0;
172 return 1;
173}
174
175static int genmii_read_link(struct mii_phy *phy)
176{
177 if (phy->autoneg == AUTONEG_ENABLE) {
178 int glpa = 0;
179 int lpa = phy_read(phy, MII_LPA) & phy_read(phy, MII_ADVERTISE);
180 if (lpa < 0)
181 return lpa;
182
183 if (phy->features &
184 (SUPPORTED_1000baseT_Full | SUPPORTED_1000baseT_Half)) {
185 int adv = phy_read(phy, MII_CTRL1000);
186 glpa = phy_read(phy, MII_STAT1000);
187
188 if (glpa < 0 || adv < 0)
189 return adv;
190
191 glpa &= adv << 2;
192 }
193
194 phy->speed = SPEED_10;
195 phy->duplex = DUPLEX_HALF;
196 phy->pause = phy->asym_pause = 0;
197
198 if (glpa & (LPA_1000FULL | LPA_1000HALF)) {
199 phy->speed = SPEED_1000;
200 if (glpa & LPA_1000FULL)
201 phy->duplex = DUPLEX_FULL;
202 } else if (lpa & (LPA_100FULL | LPA_100HALF)) {
203 phy->speed = SPEED_100;
204 if (lpa & LPA_100FULL)
205 phy->duplex = DUPLEX_FULL;
206 } else if (lpa & LPA_10FULL)
207 phy->duplex = DUPLEX_FULL;
208
209 if (phy->duplex == DUPLEX_FULL) {
210 phy->pause = lpa & LPA_PAUSE_CAP ? 1 : 0;
211 phy->asym_pause = lpa & LPA_PAUSE_ASYM ? 1 : 0;
212 }
213 } else {
214 int bmcr = phy_read(phy, MII_BMCR);
215 if (bmcr < 0)
216 return bmcr;
217
218 if (bmcr & BMCR_FULLDPLX)
219 phy->duplex = DUPLEX_FULL;
220 else
221 phy->duplex = DUPLEX_HALF;
222 if (bmcr & BMCR_SPEED1000)
223 phy->speed = SPEED_1000;
224 else if (bmcr & BMCR_SPEED100)
225 phy->speed = SPEED_100;
226 else
227 phy->speed = SPEED_10;
228
229 phy->pause = phy->asym_pause = 0;
230 }
231 return 0;
232}
233
234/* Generic implementation for most 10/100/1000 PHYs */
235static struct mii_phy_ops generic_phy_ops = {
236 .setup_aneg = genmii_setup_aneg,
237 .setup_forced = genmii_setup_forced,
238 .poll_link = genmii_poll_link,
239 .read_link = genmii_read_link
240};
241
242static struct mii_phy_def genmii_phy_def = {
243 .phy_id = 0x00000000,
244 .phy_id_mask = 0x00000000,
245 .name = "Generic MII",
246 .ops = &generic_phy_ops
247};
248
249/* CIS8201 */
250#define MII_CIS8201_10BTCSR 0x16
251#define TENBTCSR_ECHO_DISABLE 0x2000
252#define MII_CIS8201_EPCR 0x17
253#define EPCR_MODE_MASK 0x3000
254#define EPCR_GMII_MODE 0x0000
255#define EPCR_RGMII_MODE 0x1000
256#define EPCR_TBI_MODE 0x2000
257#define EPCR_RTBI_MODE 0x3000
258#define MII_CIS8201_ACSR 0x1c
259#define ACSR_PIN_PRIO_SELECT 0x0004
260
261static int cis8201_init(struct mii_phy *phy)
262{
263 int epcr;
264
265 epcr = phy_read(phy, MII_CIS8201_EPCR);
266 if (epcr < 0)
267 return epcr;
268
269 epcr &= ~EPCR_MODE_MASK;
270
271 switch (phy->mode) {
272 case PHY_MODE_TBI:
273 epcr |= EPCR_TBI_MODE;
274 break;
275 case PHY_MODE_RTBI:
276 epcr |= EPCR_RTBI_MODE;
277 break;
278 case PHY_MODE_GMII:
279 epcr |= EPCR_GMII_MODE;
280 break;
281 case PHY_MODE_RGMII:
282 default:
283 epcr |= EPCR_RGMII_MODE;
284 }
285
286 phy_write(phy, MII_CIS8201_EPCR, epcr);
287
288 /* MII regs override strap pins */
289 phy_write(phy, MII_CIS8201_ACSR,
290 phy_read(phy, MII_CIS8201_ACSR) | ACSR_PIN_PRIO_SELECT);
291
292 /* Disable TX_EN -> CRS echo mode, otherwise 10/HDX doesn't work */
293 phy_write(phy, MII_CIS8201_10BTCSR,
294 phy_read(phy, MII_CIS8201_10BTCSR) | TENBTCSR_ECHO_DISABLE);
295
296 return 0;
297}
298
299static struct mii_phy_ops cis8201_phy_ops = {
300 .init = cis8201_init,
301 .setup_aneg = genmii_setup_aneg,
302 .setup_forced = genmii_setup_forced,
303 .poll_link = genmii_poll_link,
304 .read_link = genmii_read_link
305};
306
307static struct mii_phy_def cis8201_phy_def = {
308 .phy_id = 0x000fc410,
309 .phy_id_mask = 0x000ffff0,
310 .name = "CIS8201 Gigabit Ethernet",
311 .ops = &cis8201_phy_ops
312};
313
314static struct mii_phy_def bcm5248_phy_def = {
315
316 .phy_id = 0x0143bc00,
317 .phy_id_mask = 0x0ffffff0,
318 .name = "BCM5248 10/100 SMII Ethernet",
319 .ops = &generic_phy_ops
320};
321
322static int m88e1111_init(struct mii_phy *phy)
323{
324 pr_debug("%s: Marvell 88E1111 Ethernet\n", __FUNCTION__);
325 phy_write(phy, 0x14, 0x0ce3);
326 phy_write(phy, 0x18, 0x4101);
327 phy_write(phy, 0x09, 0x0e00);
328 phy_write(phy, 0x04, 0x01e1);
329 phy_write(phy, 0x00, 0x9140);
330 phy_write(phy, 0x00, 0x1140);
331
332 return 0;
333}
334
335static int et1011c_init(struct mii_phy *phy)
336{
337 u16 reg_short;
338
339 reg_short = (u16)(phy_read(phy, 0x16));
340 reg_short &= ~(0x7);
341 reg_short |= 0x6; /* RGMII Trace Delay*/
342 phy_write(phy, 0x16, reg_short);
343
344 reg_short = (u16)(phy_read(phy, 0x17));
345 reg_short &= ~(0x40);
346 phy_write(phy, 0x17, reg_short);
347
348 phy_write(phy, 0x1c, 0x74f0);
349 return 0;
350}
351
352static struct mii_phy_ops et1011c_phy_ops = {
353 .init = et1011c_init,
354 .setup_aneg = genmii_setup_aneg,
355 .setup_forced = genmii_setup_forced,
356 .poll_link = genmii_poll_link,
357 .read_link = genmii_read_link
358};
359
360static struct mii_phy_def et1011c_phy_def = {
361 .phy_id = 0x0282f000,
362 .phy_id_mask = 0x0fffff00,
363 .name = "ET1011C Gigabit Ethernet",
364 .ops = &et1011c_phy_ops
365};
366
367
368
369
370
371static struct mii_phy_ops m88e1111_phy_ops = {
372 .init = m88e1111_init,
373 .setup_aneg = genmii_setup_aneg,
374 .setup_forced = genmii_setup_forced,
375 .poll_link = genmii_poll_link,
376 .read_link = genmii_read_link
377};
378
379static struct mii_phy_def m88e1111_phy_def = {
380
381 .phy_id = 0x01410CC0,
382 .phy_id_mask = 0x0ffffff0,
383 .name = "Marvell 88E1111 Ethernet",
384 .ops = &m88e1111_phy_ops,
385};
386
387static struct mii_phy_def *mii_phy_table[] = {
388 &et1011c_phy_def,
389 &cis8201_phy_def,
390 &bcm5248_phy_def,
391 &m88e1111_phy_def,
392 &genmii_phy_def,
393 NULL
394};
395
396int emac_mii_phy_probe(struct mii_phy *phy, int address)
397{
398 struct mii_phy_def *def;
399 int i;
400 u32 id;
401
402 phy->autoneg = AUTONEG_DISABLE;
403 phy->advertising = 0;
404 phy->address = address;
405 phy->speed = SPEED_10;
406 phy->duplex = DUPLEX_HALF;
407 phy->pause = phy->asym_pause = 0;
408
409 /* Take PHY out of isolate mode and reset it. */
410 if (emac_mii_reset_phy(phy))
411 return -ENODEV;
412
413 /* Read ID and find matching entry */
414 id = (phy_read(phy, MII_PHYSID1) << 16) | phy_read(phy, MII_PHYSID2);
415 for (i = 0; (def = mii_phy_table[i]) != NULL; i++)
416 if ((id & def->phy_id_mask) == def->phy_id)
417 break;
418 /* Should never be NULL (we have a generic entry), but... */
419 if (!def)
420 return -ENODEV;
421
422 phy->def = def;
423
424 /* Determine PHY features if needed */
425 phy->features = def->features;
426 if (!phy->features) {
427 u16 bmsr = phy_read(phy, MII_BMSR);
428 if (bmsr & BMSR_ANEGCAPABLE)
429 phy->features |= SUPPORTED_Autoneg;
430 if (bmsr & BMSR_10HALF)
431 phy->features |= SUPPORTED_10baseT_Half;
432 if (bmsr & BMSR_10FULL)
433 phy->features |= SUPPORTED_10baseT_Full;
434 if (bmsr & BMSR_100HALF)
435 phy->features |= SUPPORTED_100baseT_Half;
436 if (bmsr & BMSR_100FULL)
437 phy->features |= SUPPORTED_100baseT_Full;
438 if (bmsr & BMSR_ESTATEN) {
439 u16 esr = phy_read(phy, MII_ESTATUS);
440 if (esr & ESTATUS_1000_TFULL)
441 phy->features |= SUPPORTED_1000baseT_Full;
442 if (esr & ESTATUS_1000_THALF)
443 phy->features |= SUPPORTED_1000baseT_Half;
444 }
445 phy->features |= SUPPORTED_MII;
446 }
447
448 /* Setup default advertising */
449 phy->advertising = phy->features;
450
451 return 0;
452}
453
454MODULE_LICENSE("GPL");