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1 /*
2  * drivers/net/phy/smsc.c
3  *
4  * Driver for SMSC PHYs
5  *
6  * Author: Herbert Valerio Riedel
7  *
8  * Copyright (c) 2006 Herbert Valerio Riedel <[email protected]>
9  *
10  * This program is free software; you can redistribute  it and/or modify it
11  * under  the terms of  the GNU General  Public License as published by the
12  * Free Software Foundation;  either version 2 of the  License, or (at your
13  * option) any later version.
14  *
15  * Support added for SMSC LAN8187 and LAN8700 by [email protected]
16  *
17  */
18
19 #include <linux/kernel.h>
20 #include <linux/module.h>
21 #include <linux/mii.h>
22 #include <linux/ethtool.h>
23 #include <linux/of.h>
24 #include <linux/phy.h>
25 #include <linux/netdevice.h>
26 #include <linux/smscphy.h>
27
28 struct smsc_hw_stat {
29         const char *string;
30         u8 reg;
31         u8 bits;
32 };
33
34 static struct smsc_hw_stat smsc_hw_stats[] = {
35         { "phy_symbol_errors", 26, 16},
36 };
37
38 struct smsc_phy_priv {
39         bool energy_enable;
40 };
41
42 static int smsc_phy_config_intr(struct phy_device *phydev)
43 {
44         int rc = phy_write (phydev, MII_LAN83C185_IM,
45                         ((PHY_INTERRUPT_ENABLED == phydev->interrupts)
46                         ? MII_LAN83C185_ISF_INT_PHYLIB_EVENTS
47                         : 0));
48
49         return rc < 0 ? rc : 0;
50 }
51
52 static int smsc_phy_ack_interrupt(struct phy_device *phydev)
53 {
54         int rc = phy_read (phydev, MII_LAN83C185_ISF);
55
56         return rc < 0 ? rc : 0;
57 }
58
59 static int smsc_phy_config_init(struct phy_device *phydev)
60 {
61         struct smsc_phy_priv *priv = phydev->priv;
62
63         int rc = phy_read(phydev, MII_LAN83C185_CTRL_STATUS);
64
65         if (rc < 0)
66                 return rc;
67
68         if (priv->energy_enable) {
69                 /* Enable energy detect mode for this SMSC Transceivers */
70                 rc = phy_write(phydev, MII_LAN83C185_CTRL_STATUS,
71                                rc | MII_LAN83C185_EDPWRDOWN);
72                 if (rc < 0)
73                         return rc;
74         }
75
76         return smsc_phy_ack_interrupt(phydev);
77 }
78
79 static int smsc_phy_reset(struct phy_device *phydev)
80 {
81         int rc = phy_read(phydev, MII_LAN83C185_SPECIAL_MODES);
82         if (rc < 0)
83                 return rc;
84
85         /* If the SMSC PHY is in power down mode, then set it
86          * in all capable mode before using it.
87          */
88         if ((rc & MII_LAN83C185_MODE_MASK) == MII_LAN83C185_MODE_POWERDOWN) {
89                 /* set "all capable" mode */
90                 rc |= MII_LAN83C185_MODE_ALL;
91                 phy_write(phydev, MII_LAN83C185_SPECIAL_MODES, rc);
92         }
93
94         /* reset the phy */
95         return genphy_soft_reset(phydev);
96 }
97
98 static int lan911x_config_init(struct phy_device *phydev)
99 {
100         return smsc_phy_ack_interrupt(phydev);
101 }
102
103 /*
104  * The LAN87xx suffers from rare absence of the ENERGYON-bit when Ethernet cable
105  * plugs in while LAN87xx is in Energy Detect Power-Down mode. This leads to
106  * unstable detection of plugging in Ethernet cable.
107  * This workaround disables Energy Detect Power-Down mode and waiting for
108  * response on link pulses to detect presence of plugged Ethernet cable.
109  * The Energy Detect Power-Down mode is enabled again in the end of procedure to
110  * save approximately 220 mW of power if cable is unplugged.
111  */
112 static int lan87xx_read_status(struct phy_device *phydev)
113 {
114         struct smsc_phy_priv *priv = phydev->priv;
115
116         int err = genphy_read_status(phydev);
117
118         if (!phydev->link && priv->energy_enable) {
119                 int i;
120
121                 /* Disable EDPD to wake up PHY */
122                 int rc = phy_read(phydev, MII_LAN83C185_CTRL_STATUS);
123                 if (rc < 0)
124                         return rc;
125
126                 rc = phy_write(phydev, MII_LAN83C185_CTRL_STATUS,
127                                rc & ~MII_LAN83C185_EDPWRDOWN);
128                 if (rc < 0)
129                         return rc;
130
131                 /* Wait max 640 ms to detect energy */
132                 for (i = 0; i < 64; i++) {
133                         /* Sleep to allow link test pulses to be sent */
134                         msleep(10);
135                         rc = phy_read(phydev, MII_LAN83C185_CTRL_STATUS);
136                         if (rc < 0)
137                                 return rc;
138                         if (rc & MII_LAN83C185_ENERGYON)
139                                 break;
140                 }
141
142                 /* Re-enable EDPD */
143                 rc = phy_read(phydev, MII_LAN83C185_CTRL_STATUS);
144                 if (rc < 0)
145                         return rc;
146
147                 rc = phy_write(phydev, MII_LAN83C185_CTRL_STATUS,
148                                rc | MII_LAN83C185_EDPWRDOWN);
149                 if (rc < 0)
150                         return rc;
151         }
152
153         return err;
154 }
155
156 static int smsc_get_sset_count(struct phy_device *phydev)
157 {
158         return ARRAY_SIZE(smsc_hw_stats);
159 }
160
161 static void smsc_get_strings(struct phy_device *phydev, u8 *data)
162 {
163         int i;
164
165         for (i = 0; i < ARRAY_SIZE(smsc_hw_stats); i++) {
166                 strncpy(data + i * ETH_GSTRING_LEN,
167                        smsc_hw_stats[i].string, ETH_GSTRING_LEN);
168         }
169 }
170
171 static u64 smsc_get_stat(struct phy_device *phydev, int i)
172 {
173         struct smsc_hw_stat stat = smsc_hw_stats[i];
174         int val;
175         u64 ret;
176
177         val = phy_read(phydev, stat.reg);
178         if (val < 0)
179                 ret = U64_MAX;
180         else
181                 ret = val;
182
183         return ret;
184 }
185
186 static void smsc_get_stats(struct phy_device *phydev,
187                            struct ethtool_stats *stats, u64 *data)
188 {
189         int i;
190
191         for (i = 0; i < ARRAY_SIZE(smsc_hw_stats); i++)
192                 data[i] = smsc_get_stat(phydev, i);
193 }
194
195 static int smsc_phy_probe(struct phy_device *phydev)
196 {
197         struct device *dev = &phydev->mdio.dev;
198         struct device_node *of_node = dev->of_node;
199         struct smsc_phy_priv *priv;
200
201         priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
202         if (!priv)
203                 return -ENOMEM;
204
205         priv->energy_enable = true;
206
207         if (of_property_read_bool(of_node, "smsc,disable-energy-detect"))
208                 priv->energy_enable = false;
209
210         phydev->priv = priv;
211
212         return 0;
213 }
214
215 static struct phy_driver smsc_phy_driver[] = {
216 {
217         .phy_id         = 0x0007c0a0, /* OUI=0x00800f, Model#=0x0a */
218         .phy_id_mask    = 0xfffffff0,
219         .name           = "SMSC LAN83C185",
220
221         .features       = PHY_BASIC_FEATURES,
222
223         .probe          = smsc_phy_probe,
224
225         /* basic functions */
226         .config_init    = smsc_phy_config_init,
227         .soft_reset     = smsc_phy_reset,
228
229         /* IRQ related */
230         .ack_interrupt  = smsc_phy_ack_interrupt,
231         .config_intr    = smsc_phy_config_intr,
232
233         .suspend        = genphy_suspend,
234         .resume         = genphy_resume,
235 }, {
236         .phy_id         = 0x0007c0b0, /* OUI=0x00800f, Model#=0x0b */
237         .phy_id_mask    = 0xfffffff0,
238         .name           = "SMSC LAN8187",
239
240         .features       = PHY_BASIC_FEATURES,
241
242         .probe          = smsc_phy_probe,
243
244         /* basic functions */
245         .config_init    = smsc_phy_config_init,
246         .soft_reset     = smsc_phy_reset,
247
248         /* IRQ related */
249         .ack_interrupt  = smsc_phy_ack_interrupt,
250         .config_intr    = smsc_phy_config_intr,
251
252         /* Statistics */
253         .get_sset_count = smsc_get_sset_count,
254         .get_strings    = smsc_get_strings,
255         .get_stats      = smsc_get_stats,
256
257         .suspend        = genphy_suspend,
258         .resume         = genphy_resume,
259 }, {
260         .phy_id         = 0x0007c0c0, /* OUI=0x00800f, Model#=0x0c */
261         .phy_id_mask    = 0xfffffff0,
262         .name           = "SMSC LAN8700",
263
264         .features       = PHY_BASIC_FEATURES,
265
266         .probe          = smsc_phy_probe,
267
268         /* basic functions */
269         .read_status    = lan87xx_read_status,
270         .config_init    = smsc_phy_config_init,
271         .soft_reset     = smsc_phy_reset,
272
273         /* IRQ related */
274         .ack_interrupt  = smsc_phy_ack_interrupt,
275         .config_intr    = smsc_phy_config_intr,
276
277         /* Statistics */
278         .get_sset_count = smsc_get_sset_count,
279         .get_strings    = smsc_get_strings,
280         .get_stats      = smsc_get_stats,
281
282         .suspend        = genphy_suspend,
283         .resume         = genphy_resume,
284 }, {
285         .phy_id         = 0x0007c0d0, /* OUI=0x00800f, Model#=0x0d */
286         .phy_id_mask    = 0xfffffff0,
287         .name           = "SMSC LAN911x Internal PHY",
288
289         .features       = PHY_BASIC_FEATURES,
290
291         .probe          = smsc_phy_probe,
292
293         /* basic functions */
294         .config_init    = lan911x_config_init,
295
296         /* IRQ related */
297         .ack_interrupt  = smsc_phy_ack_interrupt,
298         .config_intr    = smsc_phy_config_intr,
299
300         .suspend        = genphy_suspend,
301         .resume         = genphy_resume,
302 }, {
303         .phy_id         = 0x0007c0f0, /* OUI=0x00800f, Model#=0x0f */
304         .phy_id_mask    = 0xfffffff0,
305         .name           = "SMSC LAN8710/LAN8720",
306
307         .features       = PHY_BASIC_FEATURES,
308         .flags          = PHY_RST_AFTER_CLK_EN,
309
310         .probe          = smsc_phy_probe,
311
312         /* basic functions */
313         .read_status    = lan87xx_read_status,
314         .config_init    = smsc_phy_config_init,
315         .soft_reset     = smsc_phy_reset,
316
317         /* IRQ related */
318         .ack_interrupt  = smsc_phy_ack_interrupt,
319         .config_intr    = smsc_phy_config_intr,
320
321         /* Statistics */
322         .get_sset_count = smsc_get_sset_count,
323         .get_strings    = smsc_get_strings,
324         .get_stats      = smsc_get_stats,
325
326         .suspend        = genphy_suspend,
327         .resume         = genphy_resume,
328 }, {
329         .phy_id         = 0x0007c110,
330         .phy_id_mask    = 0xfffffff0,
331         .name           = "SMSC LAN8740",
332
333         .features       = PHY_BASIC_FEATURES,
334
335         .probe          = smsc_phy_probe,
336
337         /* basic functions */
338         .read_status    = lan87xx_read_status,
339         .config_init    = smsc_phy_config_init,
340         .soft_reset     = smsc_phy_reset,
341
342         /* IRQ related */
343         .ack_interrupt  = smsc_phy_ack_interrupt,
344         .config_intr    = smsc_phy_config_intr,
345
346         /* Statistics */
347         .get_sset_count = smsc_get_sset_count,
348         .get_strings    = smsc_get_strings,
349         .get_stats      = smsc_get_stats,
350
351         .suspend        = genphy_suspend,
352         .resume         = genphy_resume,
353 } };
354
355 module_phy_driver(smsc_phy_driver);
356
357 MODULE_DESCRIPTION("SMSC PHY driver");
358 MODULE_AUTHOR("Herbert Valerio Riedel");
359 MODULE_LICENSE("GPL");
360
361 static struct mdio_device_id __maybe_unused smsc_tbl[] = {
362         { 0x0007c0a0, 0xfffffff0 },
363         { 0x0007c0b0, 0xfffffff0 },
364         { 0x0007c0c0, 0xfffffff0 },
365         { 0x0007c0d0, 0xfffffff0 },
366         { 0x0007c0f0, 0xfffffff0 },
367         { 0x0007c110, 0xfffffff0 },
368         { }
369 };
370
371 MODULE_DEVICE_TABLE(mdio, smsc_tbl);
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