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1/*
2 * drivers/net/phy/lxt.c
3 *
4 * Driver for Intel LXT PHYs
5 *
6 * Author: Andy Fleming
7 *
8 * Copyright (c) 2004 Freescale Semiconductor, Inc.
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 */
16#include <linux/kernel.h>
17#include <linux/string.h>
18#include <linux/errno.h>
19#include <linux/unistd.h>
20#include <linux/interrupt.h>
21#include <linux/init.h>
22#include <linux/delay.h>
23#include <linux/netdevice.h>
24#include <linux/etherdevice.h>
25#include <linux/skbuff.h>
26#include <linux/spinlock.h>
27#include <linux/mm.h>
28#include <linux/module.h>
29#include <linux/mii.h>
30#include <linux/ethtool.h>
31#include <linux/phy.h>
32
33#include <asm/io.h>
34#include <asm/irq.h>
35#include <linux/uaccess.h>
36
37/* The Level one LXT970 is used by many boards */
38
39#define MII_LXT970_IER 17 /* Interrupt Enable Register */
40
41#define MII_LXT970_IER_IEN 0x0002
42
43#define MII_LXT970_ISR 18 /* Interrupt Status Register */
44
45#define MII_LXT970_CONFIG 19 /* Configuration Register */
46
47/* ------------------------------------------------------------------------- */
48/* The Level one LXT971 is used on some of my custom boards */
49
50/* register definitions for the 971 */
51#define MII_LXT971_IER 18 /* Interrupt Enable Register */
52#define MII_LXT971_IER_IEN 0x00f2
53
54#define MII_LXT971_ISR 19 /* Interrupt Status Register */
55
56/* register definitions for the 973 */
57#define MII_LXT973_PCR 16 /* Port Configuration Register */
58#define PCR_FIBER_SELECT 1
59
60MODULE_DESCRIPTION("Intel LXT PHY driver");
61MODULE_AUTHOR("Andy Fleming");
62MODULE_LICENSE("GPL");
63
64static int lxt970_ack_interrupt(struct phy_device *phydev)
65{
66 int err;
67
68 err = phy_read(phydev, MII_BMSR);
69
70 if (err < 0)
71 return err;
72
73 err = phy_read(phydev, MII_LXT970_ISR);
74
75 if (err < 0)
76 return err;
77
78 return 0;
79}
80
81static int lxt970_config_intr(struct phy_device *phydev)
82{
83 if (phydev->interrupts == PHY_INTERRUPT_ENABLED)
84 return phy_write(phydev, MII_LXT970_IER, MII_LXT970_IER_IEN);
85 else
86 return phy_write(phydev, MII_LXT970_IER, 0);
87}
88
89static int lxt970_config_init(struct phy_device *phydev)
90{
91 return phy_write(phydev, MII_LXT970_CONFIG, 0);
92}
93
94
95static int lxt971_ack_interrupt(struct phy_device *phydev)
96{
97 int err = phy_read(phydev, MII_LXT971_ISR);
98
99 if (err < 0)
100 return err;
101
102 return 0;
103}
104
105static int lxt971_config_intr(struct phy_device *phydev)
106{
107 if (phydev->interrupts == PHY_INTERRUPT_ENABLED)
108 return phy_write(phydev, MII_LXT971_IER, MII_LXT971_IER_IEN);
109 else
110 return phy_write(phydev, MII_LXT971_IER, 0);
111}
112
113/*
114 * A2 version of LXT973 chip has an ERRATA: it randomly return the contents
115 * of the previous even register when you read a odd register regularly
116 */
117
118static int lxt973a2_update_link(struct phy_device *phydev)
119{
120 int status;
121 int control;
122 int retry = 8; /* we try 8 times */
123
124 /* Do a fake read */
125 status = phy_read(phydev, MII_BMSR);
126
127 if (status < 0)
128 return status;
129
130 control = phy_read(phydev, MII_BMCR);
131 if (control < 0)
132 return control;
133
134 do {
135 /* Read link and autonegotiation status */
136 status = phy_read(phydev, MII_BMSR);
137 } while (status >= 0 && retry-- && status == control);
138
139 if (status < 0)
140 return status;
141
142 if ((status & BMSR_LSTATUS) == 0)
143 phydev->link = 0;
144 else
145 phydev->link = 1;
146
147 return 0;
148}
149
150static int lxt973a2_read_status(struct phy_device *phydev)
151{
152 int adv;
153 int err;
154 int lpa;
155
156 /* Update the link, but return if there was an error */
157 err = lxt973a2_update_link(phydev);
158 if (err)
159 return err;
160
161 if (AUTONEG_ENABLE == phydev->autoneg) {
162 int retry = 1;
163
164 adv = phy_read(phydev, MII_ADVERTISE);
165
166 if (adv < 0)
167 return adv;
168
169 do {
170 lpa = phy_read(phydev, MII_LPA);
171
172 if (lpa < 0)
173 return lpa;
174
175 /* If both registers are equal, it is suspect but not
176 * impossible, hence a new try
177 */
178 } while (lpa == adv && retry--);
179
180 phydev->lp_advertising = mii_lpa_to_ethtool_lpa_t(lpa);
181
182 lpa &= adv;
183
184 phydev->speed = SPEED_10;
185 phydev->duplex = DUPLEX_HALF;
186 phydev->pause = phydev->asym_pause = 0;
187
188 if (lpa & (LPA_100FULL | LPA_100HALF)) {
189 phydev->speed = SPEED_100;
190
191 if (lpa & LPA_100FULL)
192 phydev->duplex = DUPLEX_FULL;
193 } else {
194 if (lpa & LPA_10FULL)
195 phydev->duplex = DUPLEX_FULL;
196 }
197
198 if (phydev->duplex == DUPLEX_FULL) {
199 phydev->pause = lpa & LPA_PAUSE_CAP ? 1 : 0;
200 phydev->asym_pause = lpa & LPA_PAUSE_ASYM ? 1 : 0;
201 }
202 } else {
203 int bmcr = phy_read(phydev, MII_BMCR);
204
205 if (bmcr < 0)
206 return bmcr;
207
208 if (bmcr & BMCR_FULLDPLX)
209 phydev->duplex = DUPLEX_FULL;
210 else
211 phydev->duplex = DUPLEX_HALF;
212
213 if (bmcr & BMCR_SPEED1000)
214 phydev->speed = SPEED_1000;
215 else if (bmcr & BMCR_SPEED100)
216 phydev->speed = SPEED_100;
217 else
218 phydev->speed = SPEED_10;
219
220 phydev->pause = phydev->asym_pause = 0;
221 phydev->lp_advertising = 0;
222 }
223
224 return 0;
225}
226
227static int lxt973_probe(struct phy_device *phydev)
228{
229 int val = phy_read(phydev, MII_LXT973_PCR);
230
231 if (val & PCR_FIBER_SELECT) {
232 /*
233 * If fiber is selected, then the only correct setting
234 * is 100Mbps, full duplex, and auto negotiation off.
235 */
236 val = phy_read(phydev, MII_BMCR);
237 val |= (BMCR_SPEED100 | BMCR_FULLDPLX);
238 val &= ~BMCR_ANENABLE;
239 phy_write(phydev, MII_BMCR, val);
240 /* Remember that the port is in fiber mode. */
241 phydev->priv = lxt973_probe;
242 } else {
243 phydev->priv = NULL;
244 }
245 return 0;
246}
247
248static int lxt973_config_aneg(struct phy_device *phydev)
249{
250 /* Do nothing if port is in fiber mode. */
251 return phydev->priv ? 0 : genphy_config_aneg(phydev);
252}
253
254static struct phy_driver lxt97x_driver[] = {
255{
256 .phy_id = 0x78100000,
257 .name = "LXT970",
258 .phy_id_mask = 0xfffffff0,
259 .features = PHY_BASIC_FEATURES,
260 .flags = PHY_HAS_INTERRUPT,
261 .config_init = lxt970_config_init,
262 .ack_interrupt = lxt970_ack_interrupt,
263 .config_intr = lxt970_config_intr,
264}, {
265 .phy_id = 0x001378e0,
266 .name = "LXT971",
267 .phy_id_mask = 0xfffffff0,
268 .features = PHY_BASIC_FEATURES,
269 .flags = PHY_HAS_INTERRUPT,
270 .ack_interrupt = lxt971_ack_interrupt,
271 .config_intr = lxt971_config_intr,
272}, {
273 .phy_id = 0x00137a10,
274 .name = "LXT973-A2",
275 .phy_id_mask = 0xffffffff,
276 .features = PHY_BASIC_FEATURES,
277 .flags = 0,
278 .probe = lxt973_probe,
279 .config_aneg = lxt973_config_aneg,
280 .read_status = lxt973a2_read_status,
281}, {
282 .phy_id = 0x00137a10,
283 .name = "LXT973",
284 .phy_id_mask = 0xfffffff0,
285 .features = PHY_BASIC_FEATURES,
286 .flags = 0,
287 .probe = lxt973_probe,
288 .config_aneg = lxt973_config_aneg,
289} };
290
291module_phy_driver(lxt97x_driver);
292
293static struct mdio_device_id __maybe_unused lxt_tbl[] = {
294 { 0x78100000, 0xfffffff0 },
295 { 0x001378e0, 0xfffffff0 },
296 { 0x00137a10, 0xfffffff0 },
297 { }
298};
299
300MODULE_DEVICE_TABLE(mdio, lxt_tbl);