Merge remote-tracking branches 'asoc/topic/cs42l73', 'asoc/topic/cs47l24', 'asoc...
[sfrench/cifs-2.6.git] / drivers / net / phy / at803x.c
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
68 MODULE_DESCRIPTION("Atheros 803x PHY driver");
69 MODULE_AUTHOR("Matus Ujhelyi");
70 MODULE_LICENSE("GPL");
71
72 struct at803x_priv {
73         bool phy_reset:1;
74         struct gpio_desc *gpiod_reset;
75 };
76
77 struct 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
86 static 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
97 static 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
114 static 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
120 static 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 */
127 static 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 */
139 static 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
150 static 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 -EINVAL;
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
201 static 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
214 static 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
238 static int at803x_resume(struct phy_device *phydev)
239 {
240         int value;
241
242         value = phy_read(phydev, MII_BMCR);
243         value &= ~(BMCR_PDOWN | BMCR_ISOLATE);
244         phy_write(phydev, MII_BMCR, value);
245
246         return 0;
247 }
248
249 static int at803x_probe(struct phy_device *phydev)
250 {
251         struct device *dev = &phydev->mdio.dev;
252         struct at803x_priv *priv;
253         struct gpio_desc *gpiod_reset;
254
255         priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
256         if (!priv)
257                 return -ENOMEM;
258
259         if (phydev->drv->phy_id != ATH8030_PHY_ID)
260                 goto does_not_require_reset_workaround;
261
262         gpiod_reset = devm_gpiod_get_optional(dev, "reset", GPIOD_OUT_LOW);
263         if (IS_ERR(gpiod_reset))
264                 return PTR_ERR(gpiod_reset);
265
266         priv->gpiod_reset = gpiod_reset;
267
268 does_not_require_reset_workaround:
269         phydev->priv = priv;
270
271         return 0;
272 }
273
274 static int at803x_config_init(struct phy_device *phydev)
275 {
276         int ret;
277
278         ret = genphy_config_init(phydev);
279         if (ret < 0)
280                 return ret;
281
282         if (phydev->interface == PHY_INTERFACE_MODE_RGMII_RXID ||
283                         phydev->interface == PHY_INTERFACE_MODE_RGMII_ID) {
284                 ret = at803x_enable_rx_delay(phydev);
285                 if (ret < 0)
286                         return ret;
287         }
288
289         if (phydev->interface == PHY_INTERFACE_MODE_RGMII_TXID ||
290                         phydev->interface == PHY_INTERFACE_MODE_RGMII_ID) {
291                 ret = at803x_enable_tx_delay(phydev);
292                 if (ret < 0)
293                         return ret;
294         }
295
296         return 0;
297 }
298
299 static int at803x_ack_interrupt(struct phy_device *phydev)
300 {
301         int err;
302
303         err = phy_read(phydev, AT803X_INTR_STATUS);
304
305         return (err < 0) ? err : 0;
306 }
307
308 static int at803x_config_intr(struct phy_device *phydev)
309 {
310         int err;
311         int value;
312
313         value = phy_read(phydev, AT803X_INTR_ENABLE);
314
315         if (phydev->interrupts == PHY_INTERRUPT_ENABLED) {
316                 value |= AT803X_INTR_ENABLE_AUTONEG_ERR;
317                 value |= AT803X_INTR_ENABLE_SPEED_CHANGED;
318                 value |= AT803X_INTR_ENABLE_DUPLEX_CHANGED;
319                 value |= AT803X_INTR_ENABLE_LINK_FAIL;
320                 value |= AT803X_INTR_ENABLE_LINK_SUCCESS;
321
322                 err = phy_write(phydev, AT803X_INTR_ENABLE, value);
323         }
324         else
325                 err = phy_write(phydev, AT803X_INTR_ENABLE, 0);
326
327         return err;
328 }
329
330 static void at803x_link_change_notify(struct phy_device *phydev)
331 {
332         struct at803x_priv *priv = phydev->priv;
333
334         /*
335          * Conduct a hardware reset for AT8030 every time a link loss is
336          * signalled. This is necessary to circumvent a hardware bug that
337          * occurs when the cable is unplugged while TX packets are pending
338          * in the FIFO. In such cases, the FIFO enters an error mode it
339          * cannot recover from by software.
340          */
341         if (phydev->state == PHY_NOLINK) {
342                 if (priv->gpiod_reset && !priv->phy_reset) {
343                         struct at803x_context context;
344
345                         at803x_context_save(phydev, &context);
346
347                         gpiod_set_value(priv->gpiod_reset, 1);
348                         msleep(1);
349                         gpiod_set_value(priv->gpiod_reset, 0);
350                         msleep(1);
351
352                         at803x_context_restore(phydev, &context);
353
354                         phydev_dbg(phydev, "%s(): phy was reset\n",
355                                    __func__);
356                         priv->phy_reset = true;
357                 }
358         } else {
359                 priv->phy_reset = false;
360         }
361 }
362
363 static int at803x_aneg_done(struct phy_device *phydev)
364 {
365         int ccr;
366
367         int aneg_done = genphy_aneg_done(phydev);
368         if (aneg_done != BMSR_ANEGCOMPLETE)
369                 return aneg_done;
370
371         /*
372          * in SGMII mode, if copper side autoneg is successful,
373          * also check SGMII side autoneg result
374          */
375         ccr = phy_read(phydev, AT803X_REG_CHIP_CONFIG);
376         if ((ccr & AT803X_MODE_CFG_MASK) != AT803X_MODE_CFG_SGMII)
377                 return aneg_done;
378
379         /* switch to SGMII/fiber page */
380         phy_write(phydev, AT803X_REG_CHIP_CONFIG, ccr & ~AT803X_BT_BX_REG_SEL);
381
382         /* check if the SGMII link is OK. */
383         if (!(phy_read(phydev, AT803X_PSSR) & AT803X_PSSR_MR_AN_COMPLETE)) {
384                 pr_warn("803x_aneg_done: SGMII link is not ok\n");
385                 aneg_done = 0;
386         }
387         /* switch back to copper page */
388         phy_write(phydev, AT803X_REG_CHIP_CONFIG, ccr | AT803X_BT_BX_REG_SEL);
389
390         return aneg_done;
391 }
392
393 static struct phy_driver at803x_driver[] = {
394 {
395         /* ATHEROS 8035 */
396         .phy_id                 = ATH8035_PHY_ID,
397         .name                   = "Atheros 8035 ethernet",
398         .phy_id_mask            = AT803X_PHY_ID_MASK,
399         .probe                  = at803x_probe,
400         .config_init            = at803x_config_init,
401         .set_wol                = at803x_set_wol,
402         .get_wol                = at803x_get_wol,
403         .suspend                = at803x_suspend,
404         .resume                 = at803x_resume,
405         .features               = PHY_GBIT_FEATURES,
406         .flags                  = PHY_HAS_INTERRUPT,
407         .config_aneg            = genphy_config_aneg,
408         .read_status            = genphy_read_status,
409         .ack_interrupt          = at803x_ack_interrupt,
410         .config_intr            = at803x_config_intr,
411 }, {
412         /* ATHEROS 8030 */
413         .phy_id                 = ATH8030_PHY_ID,
414         .name                   = "Atheros 8030 ethernet",
415         .phy_id_mask            = AT803X_PHY_ID_MASK,
416         .probe                  = at803x_probe,
417         .config_init            = at803x_config_init,
418         .link_change_notify     = at803x_link_change_notify,
419         .set_wol                = at803x_set_wol,
420         .get_wol                = at803x_get_wol,
421         .suspend                = at803x_suspend,
422         .resume                 = at803x_resume,
423         .features               = PHY_BASIC_FEATURES,
424         .flags                  = PHY_HAS_INTERRUPT,
425         .config_aneg            = genphy_config_aneg,
426         .read_status            = genphy_read_status,
427         .ack_interrupt          = at803x_ack_interrupt,
428         .config_intr            = at803x_config_intr,
429 }, {
430         /* ATHEROS 8031 */
431         .phy_id                 = ATH8031_PHY_ID,
432         .name                   = "Atheros 8031 ethernet",
433         .phy_id_mask            = AT803X_PHY_ID_MASK,
434         .probe                  = at803x_probe,
435         .config_init            = at803x_config_init,
436         .set_wol                = at803x_set_wol,
437         .get_wol                = at803x_get_wol,
438         .suspend                = at803x_suspend,
439         .resume                 = at803x_resume,
440         .features               = PHY_GBIT_FEATURES,
441         .flags                  = PHY_HAS_INTERRUPT,
442         .config_aneg            = genphy_config_aneg,
443         .read_status            = genphy_read_status,
444         .aneg_done              = at803x_aneg_done,
445         .ack_interrupt          = &at803x_ack_interrupt,
446         .config_intr            = &at803x_config_intr,
447 } };
448
449 module_phy_driver(at803x_driver);
450
451 static struct mdio_device_id __maybe_unused atheros_tbl[] = {
452         { ATH8030_PHY_ID, AT803X_PHY_ID_MASK },
453         { ATH8031_PHY_ID, AT803X_PHY_ID_MASK },
454         { ATH8035_PHY_ID, AT803X_PHY_ID_MASK },
455         { }
456 };
457
458 MODULE_DEVICE_TABLE(mdio, atheros_tbl);