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1/*
2 * drivers/net/phy/at803x.c
3 *
4 * Driver for Atheros 803x PHY
5 *
6 * Author: Matus Ujhelyi <ujhelyi.m@gmail.com>
7 *
8 * This program is free software; you can redistribute it and/or modify it
9 * under the terms of the GNU General Public License as published by the
10 * Free Software Foundation; either version 2 of the License, or (at your
11 * option) any later version.
12 */
13
14#include <linux/phy.h>
15#include <linux/module.h>
16#include <linux/string.h>
17#include <linux/netdevice.h>
18#include <linux/etherdevice.h>
19#include <linux/of_gpio.h>
20#include <linux/gpio/consumer.h>
21
22#define AT803X_INTR_ENABLE 0x12
23#define AT803X_INTR_ENABLE_AUTONEG_ERR BIT(15)
24#define AT803X_INTR_ENABLE_SPEED_CHANGED BIT(14)
25#define AT803X_INTR_ENABLE_DUPLEX_CHANGED BIT(13)
26#define AT803X_INTR_ENABLE_PAGE_RECEIVED BIT(12)
27#define AT803X_INTR_ENABLE_LINK_FAIL BIT(11)
28#define AT803X_INTR_ENABLE_LINK_SUCCESS BIT(10)
29#define AT803X_INTR_ENABLE_WIRESPEED_DOWNGRADE BIT(5)
30#define AT803X_INTR_ENABLE_POLARITY_CHANGED BIT(1)
31#define AT803X_INTR_ENABLE_WOL BIT(0)
32
33#define AT803X_INTR_STATUS 0x13
34
35#define AT803X_SMART_SPEED 0x14
36#define AT803X_LED_CONTROL 0x18
37
38#define AT803X_DEVICE_ADDR 0x03
39#define AT803X_LOC_MAC_ADDR_0_15_OFFSET 0x804C
40#define AT803X_LOC_MAC_ADDR_16_31_OFFSET 0x804B
41#define AT803X_LOC_MAC_ADDR_32_47_OFFSET 0x804A
42#define AT803X_MMD_ACCESS_CONTROL 0x0D
43#define AT803X_MMD_ACCESS_CONTROL_DATA 0x0E
44#define AT803X_FUNC_DATA 0x4003
45#define AT803X_REG_CHIP_CONFIG 0x1f
46#define AT803X_BT_BX_REG_SEL 0x8000
47
48#define AT803X_DEBUG_ADDR 0x1D
49#define AT803X_DEBUG_DATA 0x1E
50
51#define AT803X_MODE_CFG_MASK 0x0F
52#define AT803X_MODE_CFG_SGMII 0x01
53
54#define AT803X_PSSR 0x11 /*PHY-Specific Status Register*/
55#define AT803X_PSSR_MR_AN_COMPLETE 0x0200
56
57#define AT803X_DEBUG_REG_0 0x00
58#define AT803X_DEBUG_RX_CLK_DLY_EN BIT(15)
59
60#define AT803X_DEBUG_REG_5 0x05
61#define AT803X_DEBUG_TX_CLK_DLY_EN BIT(8)
62
63#define ATH8030_PHY_ID 0x004dd076
64#define ATH8031_PHY_ID 0x004dd074
65#define ATH8035_PHY_ID 0x004dd072
66#define AT803X_PHY_ID_MASK 0xffffffef
67
68MODULE_DESCRIPTION("Atheros 803x PHY driver");
69MODULE_AUTHOR("Matus Ujhelyi");
70MODULE_LICENSE("GPL");
71
72struct at803x_priv {
73 bool phy_reset:1;
74 struct gpio_desc *gpiod_reset;
75};
76
77struct at803x_context {
78 u16 bmcr;
79 u16 advertise;
80 u16 control1000;
81 u16 int_enable;
82 u16 smart_speed;
83 u16 led_control;
84};
85
86static int at803x_debug_reg_read(struct phy_device *phydev, u16 reg)
87{
88 int ret;
89
90 ret = phy_write(phydev, AT803X_DEBUG_ADDR, reg);
91 if (ret < 0)
92 return ret;
93
94 return phy_read(phydev, AT803X_DEBUG_DATA);
95}
96
97static int at803x_debug_reg_mask(struct phy_device *phydev, u16 reg,
98 u16 clear, u16 set)
99{
100 u16 val;
101 int ret;
102
103 ret = at803x_debug_reg_read(phydev, reg);
104 if (ret < 0)
105 return ret;
106
107 val = ret & 0xffff;
108 val &= ~clear;
109 val |= set;
110
111 return phy_write(phydev, AT803X_DEBUG_DATA, val);
112}
113
114static inline int at803x_enable_rx_delay(struct phy_device *phydev)
115{
116 return at803x_debug_reg_mask(phydev, AT803X_DEBUG_REG_0, 0,
117 AT803X_DEBUG_RX_CLK_DLY_EN);
118}
119
120static inline int at803x_enable_tx_delay(struct phy_device *phydev)
121{
122 return at803x_debug_reg_mask(phydev, AT803X_DEBUG_REG_5, 0,
123 AT803X_DEBUG_TX_CLK_DLY_EN);
124}
125
126/* save relevant PHY registers to private copy */
127static void at803x_context_save(struct phy_device *phydev,
128 struct at803x_context *context)
129{
130 context->bmcr = phy_read(phydev, MII_BMCR);
131 context->advertise = phy_read(phydev, MII_ADVERTISE);
132 context->control1000 = phy_read(phydev, MII_CTRL1000);
133 context->int_enable = phy_read(phydev, AT803X_INTR_ENABLE);
134 context->smart_speed = phy_read(phydev, AT803X_SMART_SPEED);
135 context->led_control = phy_read(phydev, AT803X_LED_CONTROL);
136}
137
138/* restore relevant PHY registers from private copy */
139static void at803x_context_restore(struct phy_device *phydev,
140 const struct at803x_context *context)
141{
142 phy_write(phydev, MII_BMCR, context->bmcr);
143 phy_write(phydev, MII_ADVERTISE, context->advertise);
144 phy_write(phydev, MII_CTRL1000, context->control1000);
145 phy_write(phydev, AT803X_INTR_ENABLE, context->int_enable);
146 phy_write(phydev, AT803X_SMART_SPEED, context->smart_speed);
147 phy_write(phydev, AT803X_LED_CONTROL, context->led_control);
148}
149
150static int at803x_set_wol(struct phy_device *phydev,
151 struct ethtool_wolinfo *wol)
152{
153 struct net_device *ndev = phydev->attached_dev;
154 const u8 *mac;
155 int ret;
156 u32 value;
157 unsigned int i, offsets[] = {
158 AT803X_LOC_MAC_ADDR_32_47_OFFSET,
159 AT803X_LOC_MAC_ADDR_16_31_OFFSET,
160 AT803X_LOC_MAC_ADDR_0_15_OFFSET,
161 };
162
163 if (!ndev)
164 return -ENODEV;
165
166 if (wol->wolopts & WAKE_MAGIC) {
167 mac = (const u8 *) ndev->dev_addr;
168
169 if (!is_valid_ether_addr(mac))
170 return -EFAULT;
171
172 for (i = 0; i < 3; i++) {
173 phy_write(phydev, AT803X_MMD_ACCESS_CONTROL,
174 AT803X_DEVICE_ADDR);
175 phy_write(phydev, AT803X_MMD_ACCESS_CONTROL_DATA,
176 offsets[i]);
177 phy_write(phydev, AT803X_MMD_ACCESS_CONTROL,
178 AT803X_FUNC_DATA);
179 phy_write(phydev, AT803X_MMD_ACCESS_CONTROL_DATA,
180 mac[(i * 2) + 1] | (mac[(i * 2)] << 8));
181 }
182
183 value = phy_read(phydev, AT803X_INTR_ENABLE);
184 value |= AT803X_INTR_ENABLE_WOL;
185 ret = phy_write(phydev, AT803X_INTR_ENABLE, value);
186 if (ret)
187 return ret;
188 value = phy_read(phydev, AT803X_INTR_STATUS);
189 } else {
190 value = phy_read(phydev, AT803X_INTR_ENABLE);
191 value &= (~AT803X_INTR_ENABLE_WOL);
192 ret = phy_write(phydev, AT803X_INTR_ENABLE, value);
193 if (ret)
194 return ret;
195 value = phy_read(phydev, AT803X_INTR_STATUS);
196 }
197
198 return ret;
199}
200
201static void at803x_get_wol(struct phy_device *phydev,
202 struct ethtool_wolinfo *wol)
203{
204 u32 value;
205
206 wol->supported = WAKE_MAGIC;
207 wol->wolopts = 0;
208
209 value = phy_read(phydev, AT803X_INTR_ENABLE);
210 if (value & AT803X_INTR_ENABLE_WOL)
211 wol->wolopts |= WAKE_MAGIC;
212}
213
214static int at803x_suspend(struct phy_device *phydev)
215{
216 int value;
217 int wol_enabled;
218
219 mutex_lock(&phydev->lock);
220
221 value = phy_read(phydev, AT803X_INTR_ENABLE);
222 wol_enabled = value & AT803X_INTR_ENABLE_WOL;
223
224 value = phy_read(phydev, MII_BMCR);
225
226 if (wol_enabled)
227 value |= BMCR_ISOLATE;
228 else
229 value |= BMCR_PDOWN;
230
231 phy_write(phydev, MII_BMCR, value);
232
233 mutex_unlock(&phydev->lock);
234
235 return 0;
236}
237
238static int at803x_resume(struct phy_device *phydev)
239{
240 int value;
241
242 mutex_lock(&phydev->lock);
243
244 value = phy_read(phydev, MII_BMCR);
245 value &= ~(BMCR_PDOWN | BMCR_ISOLATE);
246 phy_write(phydev, MII_BMCR, value);
247
248 mutex_unlock(&phydev->lock);
249
250 return 0;
251}
252
253static int at803x_probe(struct phy_device *phydev)
254{
255 struct device *dev = &phydev->mdio.dev;
256 struct at803x_priv *priv;
257 struct gpio_desc *gpiod_reset;
258
259 priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
260 if (!priv)
261 return -ENOMEM;
262
263 if (phydev->drv->phy_id != ATH8030_PHY_ID)
264 goto does_not_require_reset_workaround;
265
266 gpiod_reset = devm_gpiod_get_optional(dev, "reset", GPIOD_OUT_LOW);
267 if (IS_ERR(gpiod_reset))
268 return PTR_ERR(gpiod_reset);
269
270 priv->gpiod_reset = gpiod_reset;
271
272does_not_require_reset_workaround:
273 phydev->priv = priv;
274
275 return 0;
276}
277
278static int at803x_config_init(struct phy_device *phydev)
279{
280 int ret;
281
282 ret = genphy_config_init(phydev);
283 if (ret < 0)
284 return ret;
285
286 if (phydev->interface == PHY_INTERFACE_MODE_RGMII_RXID ||
287 phydev->interface == PHY_INTERFACE_MODE_RGMII_ID) {
288 ret = at803x_enable_rx_delay(phydev);
289 if (ret < 0)
290 return ret;
291 }
292
293 if (phydev->interface == PHY_INTERFACE_MODE_RGMII_TXID ||
294 phydev->interface == PHY_INTERFACE_MODE_RGMII_ID) {
295 ret = at803x_enable_tx_delay(phydev);
296 if (ret < 0)
297 return ret;
298 }
299
300 return 0;
301}
302
303static int at803x_ack_interrupt(struct phy_device *phydev)
304{
305 int err;
306
307 err = phy_read(phydev, AT803X_INTR_STATUS);
308
309 return (err < 0) ? err : 0;
310}
311
312static int at803x_config_intr(struct phy_device *phydev)
313{
314 int err;
315 int value;
316
317 value = phy_read(phydev, AT803X_INTR_ENABLE);
318
319 if (phydev->interrupts == PHY_INTERRUPT_ENABLED) {
320 value |= AT803X_INTR_ENABLE_AUTONEG_ERR;
321 value |= AT803X_INTR_ENABLE_SPEED_CHANGED;
322 value |= AT803X_INTR_ENABLE_DUPLEX_CHANGED;
323 value |= AT803X_INTR_ENABLE_LINK_FAIL;
324 value |= AT803X_INTR_ENABLE_LINK_SUCCESS;
325
326 err = phy_write(phydev, AT803X_INTR_ENABLE, value);
327 }
328 else
329 err = phy_write(phydev, AT803X_INTR_ENABLE, 0);
330
331 return err;
332}
333
334static void at803x_link_change_notify(struct phy_device *phydev)
335{
336 struct at803x_priv *priv = phydev->priv;
337
338 /*
339 * Conduct a hardware reset for AT8030 every time a link loss is
340 * signalled. This is necessary to circumvent a hardware bug that
341 * occurs when the cable is unplugged while TX packets are pending
342 * in the FIFO. In such cases, the FIFO enters an error mode it
343 * cannot recover from by software.
344 */
345 if (phydev->state == PHY_NOLINK) {
346 if (priv->gpiod_reset && !priv->phy_reset) {
347 struct at803x_context context;
348
349 at803x_context_save(phydev, &context);
350
351 gpiod_set_value(priv->gpiod_reset, 1);
352 msleep(1);
353 gpiod_set_value(priv->gpiod_reset, 0);
354 msleep(1);
355
356 at803x_context_restore(phydev, &context);
357
358 phydev_dbg(phydev, "%s(): phy was reset\n",
359 __func__);
360 priv->phy_reset = true;
361 }
362 } else {
363 priv->phy_reset = false;
364 }
365}
366
367static int at803x_aneg_done(struct phy_device *phydev)
368{
369 int ccr;
370
371 int aneg_done = genphy_aneg_done(phydev);
372 if (aneg_done != BMSR_ANEGCOMPLETE)
373 return aneg_done;
374
375 /*
376 * in SGMII mode, if copper side autoneg is successful,
377 * also check SGMII side autoneg result
378 */
379 ccr = phy_read(phydev, AT803X_REG_CHIP_CONFIG);
380 if ((ccr & AT803X_MODE_CFG_MASK) != AT803X_MODE_CFG_SGMII)
381 return aneg_done;
382
383 /* switch to SGMII/fiber page */
384 phy_write(phydev, AT803X_REG_CHIP_CONFIG, ccr & ~AT803X_BT_BX_REG_SEL);
385
386 /* check if the SGMII link is OK. */
387 if (!(phy_read(phydev, AT803X_PSSR) & AT803X_PSSR_MR_AN_COMPLETE)) {
388 pr_warn("803x_aneg_done: SGMII link is not ok\n");
389 aneg_done = 0;
390 }
391 /* switch back to copper page */
392 phy_write(phydev, AT803X_REG_CHIP_CONFIG, ccr | AT803X_BT_BX_REG_SEL);
393
394 return aneg_done;
395}
396
397static struct phy_driver at803x_driver[] = {
398{
399 /* ATHEROS 8035 */
400 .phy_id = ATH8035_PHY_ID,
401 .name = "Atheros 8035 ethernet",
402 .phy_id_mask = AT803X_PHY_ID_MASK,
403 .probe = at803x_probe,
404 .config_init = at803x_config_init,
405 .set_wol = at803x_set_wol,
406 .get_wol = at803x_get_wol,
407 .suspend = at803x_suspend,
408 .resume = at803x_resume,
409 .features = PHY_GBIT_FEATURES,
410 .flags = PHY_HAS_INTERRUPT,
411 .config_aneg = genphy_config_aneg,
412 .read_status = genphy_read_status,
413 .ack_interrupt = at803x_ack_interrupt,
414 .config_intr = at803x_config_intr,
415}, {
416 /* ATHEROS 8030 */
417 .phy_id = ATH8030_PHY_ID,
418 .name = "Atheros 8030 ethernet",
419 .phy_id_mask = AT803X_PHY_ID_MASK,
420 .probe = at803x_probe,
421 .config_init = at803x_config_init,
422 .link_change_notify = at803x_link_change_notify,
423 .set_wol = at803x_set_wol,
424 .get_wol = at803x_get_wol,
425 .suspend = at803x_suspend,
426 .resume = at803x_resume,
427 .features = PHY_BASIC_FEATURES,
428 .flags = PHY_HAS_INTERRUPT,
429 .config_aneg = genphy_config_aneg,
430 .read_status = genphy_read_status,
431 .ack_interrupt = at803x_ack_interrupt,
432 .config_intr = at803x_config_intr,
433}, {
434 /* ATHEROS 8031 */
435 .phy_id = ATH8031_PHY_ID,
436 .name = "Atheros 8031 ethernet",
437 .phy_id_mask = AT803X_PHY_ID_MASK,
438 .probe = at803x_probe,
439 .config_init = at803x_config_init,
440 .set_wol = at803x_set_wol,
441 .get_wol = at803x_get_wol,
442 .suspend = at803x_suspend,
443 .resume = at803x_resume,
444 .features = PHY_GBIT_FEATURES,
445 .flags = PHY_HAS_INTERRUPT,
446 .config_aneg = genphy_config_aneg,
447 .read_status = genphy_read_status,
448 .aneg_done = at803x_aneg_done,
449 .ack_interrupt = &at803x_ack_interrupt,
450 .config_intr = &at803x_config_intr,
451} };
452
453module_phy_driver(at803x_driver);
454
455static struct mdio_device_id __maybe_unused atheros_tbl[] = {
456 { ATH8030_PHY_ID, AT803X_PHY_ID_MASK },
457 { ATH8031_PHY_ID, AT803X_PHY_ID_MASK },
458 { ATH8035_PHY_ID, AT803X_PHY_ID_MASK },
459 { }
460};
461
462MODULE_DEVICE_TABLE(mdio, atheros_tbl);