xref: /openbmc/linux/drivers/net/phy/dp83tc811.c (revision 73f476aa)
1 // SPDX-License-Identifier: GPL-2.0
2 /*
3  * Driver for the Texas Instruments DP83TC811 PHY
4  *
5  * Copyright (C) 2018 Texas Instruments Incorporated - http://www.ti.com/
6  *
7  */
8 
9 #include <linux/ethtool.h>
10 #include <linux/etherdevice.h>
11 #include <linux/kernel.h>
12 #include <linux/mii.h>
13 #include <linux/module.h>
14 #include <linux/of.h>
15 #include <linux/phy.h>
16 #include <linux/netdevice.h>
17 
18 #define DP83TC811_PHY_ID	0x2000a253
19 #define DP83811_DEVADDR		0x1f
20 
21 #define MII_DP83811_SGMII_CTRL	0x09
22 #define MII_DP83811_INT_STAT1	0x12
23 #define MII_DP83811_INT_STAT2	0x13
24 #define MII_DP83811_INT_STAT3	0x18
25 #define MII_DP83811_RESET_CTRL	0x1f
26 
27 #define DP83811_HW_RESET	BIT(15)
28 #define DP83811_SW_RESET	BIT(14)
29 
30 /* INT_STAT1 bits */
31 #define DP83811_RX_ERR_HF_INT_EN	BIT(0)
32 #define DP83811_MS_TRAINING_INT_EN	BIT(1)
33 #define DP83811_ANEG_COMPLETE_INT_EN	BIT(2)
34 #define DP83811_ESD_EVENT_INT_EN	BIT(3)
35 #define DP83811_WOL_INT_EN		BIT(4)
36 #define DP83811_LINK_STAT_INT_EN	BIT(5)
37 #define DP83811_ENERGY_DET_INT_EN	BIT(6)
38 #define DP83811_LINK_QUAL_INT_EN	BIT(7)
39 
40 /* INT_STAT2 bits */
41 #define DP83811_JABBER_DET_INT_EN	BIT(0)
42 #define DP83811_POLARITY_INT_EN		BIT(1)
43 #define DP83811_SLEEP_MODE_INT_EN	BIT(2)
44 #define DP83811_OVERTEMP_INT_EN		BIT(3)
45 #define DP83811_OVERVOLTAGE_INT_EN	BIT(6)
46 #define DP83811_UNDERVOLTAGE_INT_EN	BIT(7)
47 
48 /* INT_STAT3 bits */
49 #define DP83811_LPS_INT_EN	BIT(0)
50 #define DP83811_NO_FRAME_INT_EN	BIT(3)
51 #define DP83811_POR_DONE_INT_EN	BIT(4)
52 
53 #define MII_DP83811_RXSOP1	0x04a5
54 #define MII_DP83811_RXSOP2	0x04a6
55 #define MII_DP83811_RXSOP3	0x04a7
56 
57 /* WoL Registers */
58 #define MII_DP83811_WOL_CFG	0x04a0
59 #define MII_DP83811_WOL_STAT	0x04a1
60 #define MII_DP83811_WOL_DA1	0x04a2
61 #define MII_DP83811_WOL_DA2	0x04a3
62 #define MII_DP83811_WOL_DA3	0x04a4
63 
64 /* WoL bits */
65 #define DP83811_WOL_MAGIC_EN	BIT(0)
66 #define DP83811_WOL_SECURE_ON	BIT(5)
67 #define DP83811_WOL_EN		BIT(7)
68 #define DP83811_WOL_INDICATION_SEL BIT(8)
69 #define DP83811_WOL_CLR_INDICATION BIT(11)
70 
71 /* SGMII CTRL bits */
72 #define DP83811_TDR_AUTO		BIT(8)
73 #define DP83811_SGMII_EN		BIT(12)
74 #define DP83811_SGMII_AUTO_NEG_EN	BIT(13)
75 #define DP83811_SGMII_TX_ERR_DIS	BIT(14)
76 #define DP83811_SGMII_SOFT_RESET	BIT(15)
77 
dp83811_ack_interrupt(struct phy_device * phydev)78 static int dp83811_ack_interrupt(struct phy_device *phydev)
79 {
80 	int err;
81 
82 	err = phy_read(phydev, MII_DP83811_INT_STAT1);
83 	if (err < 0)
84 		return err;
85 
86 	err = phy_read(phydev, MII_DP83811_INT_STAT2);
87 	if (err < 0)
88 		return err;
89 
90 	err = phy_read(phydev, MII_DP83811_INT_STAT3);
91 	if (err < 0)
92 		return err;
93 
94 	return 0;
95 }
96 
dp83811_set_wol(struct phy_device * phydev,struct ethtool_wolinfo * wol)97 static int dp83811_set_wol(struct phy_device *phydev,
98 			   struct ethtool_wolinfo *wol)
99 {
100 	struct net_device *ndev = phydev->attached_dev;
101 	const u8 *mac;
102 	u16 value;
103 
104 	if (wol->wolopts & (WAKE_MAGIC | WAKE_MAGICSECURE)) {
105 		mac = (const u8 *)ndev->dev_addr;
106 
107 		if (!is_valid_ether_addr(mac))
108 			return -EINVAL;
109 
110 		/* MAC addresses start with byte 5, but stored in mac[0].
111 		 * 811 PHYs store bytes 4|5, 2|3, 0|1
112 		 */
113 		phy_write_mmd(phydev, DP83811_DEVADDR, MII_DP83811_WOL_DA1,
114 			      (mac[1] << 8) | mac[0]);
115 		phy_write_mmd(phydev, DP83811_DEVADDR, MII_DP83811_WOL_DA2,
116 			      (mac[3] << 8) | mac[2]);
117 		phy_write_mmd(phydev, DP83811_DEVADDR, MII_DP83811_WOL_DA3,
118 			      (mac[5] << 8) | mac[4]);
119 
120 		value = phy_read_mmd(phydev, DP83811_DEVADDR,
121 				     MII_DP83811_WOL_CFG);
122 		if (wol->wolopts & WAKE_MAGIC)
123 			value |= DP83811_WOL_MAGIC_EN;
124 		else
125 			value &= ~DP83811_WOL_MAGIC_EN;
126 
127 		if (wol->wolopts & WAKE_MAGICSECURE) {
128 			phy_write_mmd(phydev, DP83811_DEVADDR,
129 				      MII_DP83811_RXSOP1,
130 				      (wol->sopass[1] << 8) | wol->sopass[0]);
131 			phy_write_mmd(phydev, DP83811_DEVADDR,
132 				      MII_DP83811_RXSOP2,
133 				      (wol->sopass[3] << 8) | wol->sopass[2]);
134 			phy_write_mmd(phydev, DP83811_DEVADDR,
135 				      MII_DP83811_RXSOP3,
136 				      (wol->sopass[5] << 8) | wol->sopass[4]);
137 			value |= DP83811_WOL_SECURE_ON;
138 		} else {
139 			value &= ~DP83811_WOL_SECURE_ON;
140 		}
141 
142 		/* Clear any pending WoL interrupt */
143 		phy_read(phydev, MII_DP83811_INT_STAT1);
144 
145 		value |= DP83811_WOL_EN | DP83811_WOL_INDICATION_SEL |
146 			 DP83811_WOL_CLR_INDICATION;
147 
148 		return phy_write_mmd(phydev, DP83811_DEVADDR,
149 				     MII_DP83811_WOL_CFG, value);
150 	} else {
151 		return phy_clear_bits_mmd(phydev, DP83811_DEVADDR,
152 					  MII_DP83811_WOL_CFG, DP83811_WOL_EN);
153 	}
154 
155 }
156 
dp83811_get_wol(struct phy_device * phydev,struct ethtool_wolinfo * wol)157 static void dp83811_get_wol(struct phy_device *phydev,
158 			    struct ethtool_wolinfo *wol)
159 {
160 	u16 sopass_val;
161 	int value;
162 
163 	wol->supported = (WAKE_MAGIC | WAKE_MAGICSECURE);
164 	wol->wolopts = 0;
165 
166 	value = phy_read_mmd(phydev, DP83811_DEVADDR, MII_DP83811_WOL_CFG);
167 
168 	if (value & DP83811_WOL_MAGIC_EN)
169 		wol->wolopts |= WAKE_MAGIC;
170 
171 	if (value & DP83811_WOL_SECURE_ON) {
172 		sopass_val = phy_read_mmd(phydev, DP83811_DEVADDR,
173 					  MII_DP83811_RXSOP1);
174 		wol->sopass[0] = (sopass_val & 0xff);
175 		wol->sopass[1] = (sopass_val >> 8);
176 
177 		sopass_val = phy_read_mmd(phydev, DP83811_DEVADDR,
178 					  MII_DP83811_RXSOP2);
179 		wol->sopass[2] = (sopass_val & 0xff);
180 		wol->sopass[3] = (sopass_val >> 8);
181 
182 		sopass_val = phy_read_mmd(phydev, DP83811_DEVADDR,
183 					  MII_DP83811_RXSOP3);
184 		wol->sopass[4] = (sopass_val & 0xff);
185 		wol->sopass[5] = (sopass_val >> 8);
186 
187 		wol->wolopts |= WAKE_MAGICSECURE;
188 	}
189 
190 	/* WoL is not enabled so set wolopts to 0 */
191 	if (!(value & DP83811_WOL_EN))
192 		wol->wolopts = 0;
193 }
194 
dp83811_config_intr(struct phy_device * phydev)195 static int dp83811_config_intr(struct phy_device *phydev)
196 {
197 	int misr_status, err;
198 
199 	if (phydev->interrupts == PHY_INTERRUPT_ENABLED) {
200 		err = dp83811_ack_interrupt(phydev);
201 		if (err)
202 			return err;
203 
204 		misr_status = phy_read(phydev, MII_DP83811_INT_STAT1);
205 		if (misr_status < 0)
206 			return misr_status;
207 
208 		misr_status |= (DP83811_RX_ERR_HF_INT_EN |
209 				DP83811_MS_TRAINING_INT_EN |
210 				DP83811_ANEG_COMPLETE_INT_EN |
211 				DP83811_ESD_EVENT_INT_EN |
212 				DP83811_WOL_INT_EN |
213 				DP83811_LINK_STAT_INT_EN |
214 				DP83811_ENERGY_DET_INT_EN |
215 				DP83811_LINK_QUAL_INT_EN);
216 
217 		err = phy_write(phydev, MII_DP83811_INT_STAT1, misr_status);
218 		if (err < 0)
219 			return err;
220 
221 		misr_status = phy_read(phydev, MII_DP83811_INT_STAT2);
222 		if (misr_status < 0)
223 			return misr_status;
224 
225 		misr_status |= (DP83811_JABBER_DET_INT_EN |
226 				DP83811_POLARITY_INT_EN |
227 				DP83811_SLEEP_MODE_INT_EN |
228 				DP83811_OVERTEMP_INT_EN |
229 				DP83811_OVERVOLTAGE_INT_EN |
230 				DP83811_UNDERVOLTAGE_INT_EN);
231 
232 		err = phy_write(phydev, MII_DP83811_INT_STAT2, misr_status);
233 		if (err < 0)
234 			return err;
235 
236 		misr_status = phy_read(phydev, MII_DP83811_INT_STAT3);
237 		if (misr_status < 0)
238 			return misr_status;
239 
240 		misr_status |= (DP83811_LPS_INT_EN |
241 				DP83811_NO_FRAME_INT_EN |
242 				DP83811_POR_DONE_INT_EN);
243 
244 		err = phy_write(phydev, MII_DP83811_INT_STAT3, misr_status);
245 
246 	} else {
247 		err = phy_write(phydev, MII_DP83811_INT_STAT1, 0);
248 		if (err < 0)
249 			return err;
250 
251 		err = phy_write(phydev, MII_DP83811_INT_STAT2, 0);
252 		if (err < 0)
253 			return err;
254 
255 		err = phy_write(phydev, MII_DP83811_INT_STAT3, 0);
256 		if (err < 0)
257 			return err;
258 
259 		err = dp83811_ack_interrupt(phydev);
260 	}
261 
262 	return err;
263 }
264 
dp83811_handle_interrupt(struct phy_device * phydev)265 static irqreturn_t dp83811_handle_interrupt(struct phy_device *phydev)
266 {
267 	bool trigger_machine = false;
268 	int irq_status;
269 
270 	/* The INT_STAT registers 1, 2 and 3 are holding the interrupt status
271 	 * in the upper half (15:8), while the lower half (7:0) is used for
272 	 * controlling the interrupt enable state of those individual interrupt
273 	 * sources. To determine the possible interrupt sources, just read the
274 	 * INT_STAT* register and use it directly to know which interrupts have
275 	 * been enabled previously or not.
276 	 */
277 	irq_status = phy_read(phydev, MII_DP83811_INT_STAT1);
278 	if (irq_status < 0) {
279 		phy_error(phydev);
280 		return IRQ_NONE;
281 	}
282 	if (irq_status & ((irq_status & GENMASK(7, 0)) << 8))
283 		trigger_machine = true;
284 
285 	irq_status = phy_read(phydev, MII_DP83811_INT_STAT2);
286 	if (irq_status < 0) {
287 		phy_error(phydev);
288 		return IRQ_NONE;
289 	}
290 	if (irq_status & ((irq_status & GENMASK(7, 0)) << 8))
291 		trigger_machine = true;
292 
293 	irq_status = phy_read(phydev, MII_DP83811_INT_STAT3);
294 	if (irq_status < 0) {
295 		phy_error(phydev);
296 		return IRQ_NONE;
297 	}
298 	if (irq_status & ((irq_status & GENMASK(7, 0)) << 8))
299 		trigger_machine = true;
300 
301 	if (!trigger_machine)
302 		return IRQ_NONE;
303 
304 	phy_trigger_machine(phydev);
305 
306 	return IRQ_HANDLED;
307 }
308 
dp83811_config_aneg(struct phy_device * phydev)309 static int dp83811_config_aneg(struct phy_device *phydev)
310 {
311 	int value, err;
312 
313 	if (phydev->interface == PHY_INTERFACE_MODE_SGMII) {
314 		value = phy_read(phydev, MII_DP83811_SGMII_CTRL);
315 		if (phydev->autoneg == AUTONEG_ENABLE) {
316 			err = phy_write(phydev, MII_DP83811_SGMII_CTRL,
317 					(DP83811_SGMII_AUTO_NEG_EN | value));
318 			if (err < 0)
319 				return err;
320 		} else {
321 			err = phy_write(phydev, MII_DP83811_SGMII_CTRL,
322 					(~DP83811_SGMII_AUTO_NEG_EN & value));
323 			if (err < 0)
324 				return err;
325 		}
326 	}
327 
328 	return genphy_config_aneg(phydev);
329 }
330 
dp83811_config_init(struct phy_device * phydev)331 static int dp83811_config_init(struct phy_device *phydev)
332 {
333 	int value, err;
334 
335 	value = phy_read(phydev, MII_DP83811_SGMII_CTRL);
336 	if (phydev->interface == PHY_INTERFACE_MODE_SGMII) {
337 		err = phy_write(phydev, MII_DP83811_SGMII_CTRL,
338 					(DP83811_SGMII_EN | value));
339 	} else {
340 		err = phy_write(phydev, MII_DP83811_SGMII_CTRL,
341 				(~DP83811_SGMII_EN & value));
342 	}
343 
344 	if (err < 0)
345 
346 		return err;
347 
348 	value = DP83811_WOL_MAGIC_EN | DP83811_WOL_SECURE_ON | DP83811_WOL_EN;
349 
350 	return phy_clear_bits_mmd(phydev, DP83811_DEVADDR, MII_DP83811_WOL_CFG,
351 				  value);
352 }
353 
dp83811_phy_reset(struct phy_device * phydev)354 static int dp83811_phy_reset(struct phy_device *phydev)
355 {
356 	int err;
357 
358 	err = phy_write(phydev, MII_DP83811_RESET_CTRL, DP83811_HW_RESET);
359 	if (err < 0)
360 		return err;
361 
362 	return 0;
363 }
364 
dp83811_suspend(struct phy_device * phydev)365 static int dp83811_suspend(struct phy_device *phydev)
366 {
367 	int value;
368 
369 	value = phy_read_mmd(phydev, DP83811_DEVADDR, MII_DP83811_WOL_CFG);
370 
371 	if (!(value & DP83811_WOL_EN))
372 		genphy_suspend(phydev);
373 
374 	return 0;
375 }
376 
dp83811_resume(struct phy_device * phydev)377 static int dp83811_resume(struct phy_device *phydev)
378 {
379 	genphy_resume(phydev);
380 
381 	phy_set_bits_mmd(phydev, DP83811_DEVADDR, MII_DP83811_WOL_CFG,
382 			 DP83811_WOL_CLR_INDICATION);
383 
384 	return 0;
385 }
386 
387 static struct phy_driver dp83811_driver[] = {
388 	{
389 		.phy_id = DP83TC811_PHY_ID,
390 		.phy_id_mask = 0xfffffff0,
391 		.name = "TI DP83TC811",
392 		/* PHY_BASIC_FEATURES */
393 		.config_init = dp83811_config_init,
394 		.config_aneg = dp83811_config_aneg,
395 		.soft_reset = dp83811_phy_reset,
396 		.get_wol = dp83811_get_wol,
397 		.set_wol = dp83811_set_wol,
398 		.config_intr = dp83811_config_intr,
399 		.handle_interrupt = dp83811_handle_interrupt,
400 		.suspend = dp83811_suspend,
401 		.resume = dp83811_resume,
402 	 },
403 };
404 module_phy_driver(dp83811_driver);
405 
406 static struct mdio_device_id __maybe_unused dp83811_tbl[] = {
407 	{ DP83TC811_PHY_ID, 0xfffffff0 },
408 	{ },
409 };
410 MODULE_DEVICE_TABLE(mdio, dp83811_tbl);
411 
412 MODULE_DESCRIPTION("Texas Instruments DP83TC811 PHY driver");
413 MODULE_AUTHOR("Dan Murphy <dmurphy@ti.com");
414 MODULE_LICENSE("GPL");
415