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1// SPDX-License-Identifier: GPL-2.0+
2/*
3 * drivers/net/phy/lxt.c
4 *
5 * Driver for Intel LXT PHYs
6 *
7 * Author: Andy Fleming
8 *
9 * Copyright (c) 2004 Freescale Semiconductor, Inc.
10 */
11#include <linux/kernel.h>
12#include <linux/string.h>
13#include <linux/errno.h>
14#include <linux/unistd.h>
15#include <linux/interrupt.h>
16#include <linux/init.h>
17#include <linux/delay.h>
18#include <linux/netdevice.h>
19#include <linux/etherdevice.h>
20#include <linux/skbuff.h>
21#include <linux/spinlock.h>
22#include <linux/mm.h>
23#include <linux/module.h>
24#include <linux/mii.h>
25#include <linux/ethtool.h>
26#include <linux/phy.h>
27
28#include <asm/io.h>
29#include <asm/irq.h>
30#include <linux/uaccess.h>
31
32/* The Level one LXT970 is used by many boards */
33
34#define MII_LXT970_IER 17 /* Interrupt Enable Register */
35
36#define MII_LXT970_IER_IEN 0x0002
37
38#define MII_LXT970_ISR 18 /* Interrupt Status Register */
39
40#define MII_LXT970_IRS_MINT BIT(15)
41
42#define MII_LXT970_CONFIG 19 /* Configuration Register */
43
44/* ------------------------------------------------------------------------- */
45/* The Level one LXT971 is used on some of my custom boards */
46
47/* register definitions for the 971 */
48#define MII_LXT971_IER 18 /* Interrupt Enable Register */
49#define MII_LXT971_IER_IEN 0x00f2
50
51#define MII_LXT971_ISR 19 /* Interrupt Status Register */
52#define MII_LXT971_ISR_MASK 0x00f0
53
54/* register definitions for the 973 */
55#define MII_LXT973_PCR 16 /* Port Configuration Register */
56#define PCR_FIBER_SELECT 1
57
58MODULE_DESCRIPTION("Intel LXT PHY driver");
59MODULE_AUTHOR("Andy Fleming");
60MODULE_LICENSE("GPL");
61
62static int lxt970_ack_interrupt(struct phy_device *phydev)
63{
64 int err;
65
66 err = phy_read(phydev, MII_BMSR);
67
68 if (err < 0)
69 return err;
70
71 err = phy_read(phydev, MII_LXT970_ISR);
72
73 if (err < 0)
74 return err;
75
76 return 0;
77}
78
79static int lxt970_config_intr(struct phy_device *phydev)
80{
81 int err;
82
83 if (phydev->interrupts == PHY_INTERRUPT_ENABLED) {
84 err = lxt970_ack_interrupt(phydev);
85 if (err)
86 return err;
87
88 err = phy_write(phydev, MII_LXT970_IER, MII_LXT970_IER_IEN);
89 } else {
90 err = phy_write(phydev, MII_LXT970_IER, 0);
91 if (err)
92 return err;
93
94 err = lxt970_ack_interrupt(phydev);
95 }
96
97 return err;
98}
99
100static irqreturn_t lxt970_handle_interrupt(struct phy_device *phydev)
101{
102 int irq_status;
103
104 /* The interrupt status register is cleared by reading BMSR
105 * followed by MII_LXT970_ISR
106 */
107 irq_status = phy_read(phydev, MII_BMSR);
108 if (irq_status < 0) {
109 phy_error(phydev);
110 return IRQ_NONE;
111 }
112
113 irq_status = phy_read(phydev, MII_LXT970_ISR);
114 if (irq_status < 0) {
115 phy_error(phydev);
116 return IRQ_NONE;
117 }
118
119 if (!(irq_status & MII_LXT970_IRS_MINT))
120 return IRQ_NONE;
121
122 phy_trigger_machine(phydev);
123
124 return IRQ_HANDLED;
125}
126
127static int lxt970_config_init(struct phy_device *phydev)
128{
129 return phy_write(phydev, MII_LXT970_CONFIG, 0);
130}
131
132
133static int lxt971_ack_interrupt(struct phy_device *phydev)
134{
135 int err = phy_read(phydev, MII_LXT971_ISR);
136
137 if (err < 0)
138 return err;
139
140 return 0;
141}
142
143static int lxt971_config_intr(struct phy_device *phydev)
144{
145 int err;
146
147 if (phydev->interrupts == PHY_INTERRUPT_ENABLED) {
148 err = lxt971_ack_interrupt(phydev);
149 if (err)
150 return err;
151
152 err = phy_write(phydev, MII_LXT971_IER, MII_LXT971_IER_IEN);
153 } else {
154 err = phy_write(phydev, MII_LXT971_IER, 0);
155 if (err)
156 return err;
157
158 err = lxt971_ack_interrupt(phydev);
159 }
160
161 return err;
162}
163
164static irqreturn_t lxt971_handle_interrupt(struct phy_device *phydev)
165{
166 int irq_status;
167
168 irq_status = phy_read(phydev, MII_LXT971_ISR);
169 if (irq_status < 0) {
170 phy_error(phydev);
171 return IRQ_NONE;
172 }
173
174 if (!(irq_status & MII_LXT971_ISR_MASK))
175 return IRQ_NONE;
176
177 phy_trigger_machine(phydev);
178
179 return IRQ_HANDLED;
180}
181
182/*
183 * A2 version of LXT973 chip has an ERRATA: it randomly return the contents
184 * of the previous even register when you read a odd register regularly
185 */
186
187static int lxt973a2_update_link(struct phy_device *phydev)
188{
189 int status;
190 int control;
191 int retry = 8; /* we try 8 times */
192
193 /* Do a fake read */
194 status = phy_read(phydev, MII_BMSR);
195
196 if (status < 0)
197 return status;
198
199 control = phy_read(phydev, MII_BMCR);
200 if (control < 0)
201 return control;
202
203 do {
204 /* Read link and autonegotiation status */
205 status = phy_read(phydev, MII_BMSR);
206 } while (status >= 0 && retry-- && status == control);
207
208 if (status < 0)
209 return status;
210
211 if ((status & BMSR_LSTATUS) == 0)
212 phydev->link = 0;
213 else
214 phydev->link = 1;
215
216 return 0;
217}
218
219static int lxt973a2_read_status(struct phy_device *phydev)
220{
221 int adv;
222 int err;
223 int lpa;
224
225 /* Update the link, but return if there was an error */
226 err = lxt973a2_update_link(phydev);
227 if (err)
228 return err;
229
230 if (AUTONEG_ENABLE == phydev->autoneg) {
231 int retry = 1;
232
233 adv = phy_read(phydev, MII_ADVERTISE);
234
235 if (adv < 0)
236 return adv;
237
238 do {
239 lpa = phy_read(phydev, MII_LPA);
240
241 if (lpa < 0)
242 return lpa;
243
244 /* If both registers are equal, it is suspect but not
245 * impossible, hence a new try
246 */
247 } while (lpa == adv && retry--);
248
249 mii_lpa_to_linkmode_lpa_t(phydev->lp_advertising, lpa);
250
251 lpa &= adv;
252
253 phydev->speed = SPEED_10;
254 phydev->duplex = DUPLEX_HALF;
255 phydev->pause = phydev->asym_pause = 0;
256
257 if (lpa & (LPA_100FULL | LPA_100HALF)) {
258 phydev->speed = SPEED_100;
259
260 if (lpa & LPA_100FULL)
261 phydev->duplex = DUPLEX_FULL;
262 } else {
263 if (lpa & LPA_10FULL)
264 phydev->duplex = DUPLEX_FULL;
265 }
266
267 phy_resolve_aneg_pause(phydev);
268 } else {
269 err = genphy_read_status_fixed(phydev);
270 if (err < 0)
271 return err;
272
273 phydev->pause = phydev->asym_pause = 0;
274 linkmode_zero(phydev->lp_advertising);
275 }
276
277 return 0;
278}
279
280static int lxt973_probe(struct phy_device *phydev)
281{
282 int val = phy_read(phydev, MII_LXT973_PCR);
283
284 if (val & PCR_FIBER_SELECT) {
285 /*
286 * If fiber is selected, then the only correct setting
287 * is 100Mbps, full duplex, and auto negotiation off.
288 */
289 val = phy_read(phydev, MII_BMCR);
290 val |= (BMCR_SPEED100 | BMCR_FULLDPLX);
291 val &= ~BMCR_ANENABLE;
292 phy_write(phydev, MII_BMCR, val);
293 /* Remember that the port is in fiber mode. */
294 phydev->priv = lxt973_probe;
295 phydev->port = PORT_FIBRE;
296 } else {
297 phydev->priv = NULL;
298 }
299 return 0;
300}
301
302static int lxt973_config_aneg(struct phy_device *phydev)
303{
304 /* Do nothing if port is in fiber mode. */
305 return phydev->priv ? 0 : genphy_config_aneg(phydev);
306}
307
308static struct phy_driver lxt97x_driver[] = {
309{
310 .phy_id = 0x78100000,
311 .name = "LXT970",
312 .phy_id_mask = 0xfffffff0,
313 /* PHY_BASIC_FEATURES */
314 .config_init = lxt970_config_init,
315 .config_intr = lxt970_config_intr,
316 .handle_interrupt = lxt970_handle_interrupt,
317}, {
318 .phy_id = 0x001378e0,
319 .name = "LXT971",
320 .phy_id_mask = 0xfffffff0,
321 /* PHY_BASIC_FEATURES */
322 .config_intr = lxt971_config_intr,
323 .handle_interrupt = lxt971_handle_interrupt,
324 .suspend = genphy_suspend,
325 .resume = genphy_resume,
326}, {
327 .phy_id = 0x00137a10,
328 .name = "LXT973-A2",
329 .phy_id_mask = 0xffffffff,
330 /* PHY_BASIC_FEATURES */
331 .flags = 0,
332 .probe = lxt973_probe,
333 .config_aneg = lxt973_config_aneg,
334 .read_status = lxt973a2_read_status,
335 .suspend = genphy_suspend,
336 .resume = genphy_resume,
337}, {
338 .phy_id = 0x00137a10,
339 .name = "LXT973",
340 .phy_id_mask = 0xfffffff0,
341 /* PHY_BASIC_FEATURES */
342 .flags = 0,
343 .probe = lxt973_probe,
344 .config_aneg = lxt973_config_aneg,
345 .suspend = genphy_suspend,
346 .resume = genphy_resume,
347} };
348
349module_phy_driver(lxt97x_driver);
350
351static const struct mdio_device_id __maybe_unused lxt_tbl[] = {
352 { 0x78100000, 0xfffffff0 },
353 { 0x001378e0, 0xfffffff0 },
354 { 0x00137a10, 0xfffffff0 },
355 { }
356};
357
358MODULE_DEVICE_TABLE(mdio, lxt_tbl);