1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /***************************************************************************
3  *
4  * Copyright (C) 2004-2008 SMSC
5  * Copyright (C) 2005-2008 ARM
6  *
7  ***************************************************************************
8  * Rewritten, heavily based on smsc911x simple driver by SMSC.
9  * Partly uses io macros from smc91x.c by Nicolas Pitre
10  *
11  * Supported devices:
12  *   LAN9115, LAN9116, LAN9117, LAN9118
13  *   LAN9215, LAN9216, LAN9217, LAN9218
14  *   LAN9210, LAN9211
15  *   LAN9220, LAN9221
16  *   LAN89218,LAN9250
17  */
18 
19 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
20 
21 #include <linux/crc32.h>
22 #include <linux/clk.h>
23 #include <linux/delay.h>
24 #include <linux/errno.h>
25 #include <linux/etherdevice.h>
26 #include <linux/ethtool.h>
27 #include <linux/init.h>
28 #include <linux/interrupt.h>
29 #include <linux/ioport.h>
30 #include <linux/kernel.h>
31 #include <linux/module.h>
32 #include <linux/netdevice.h>
33 #include <linux/platform_device.h>
34 #include <linux/regulator/consumer.h>
35 #include <linux/sched.h>
36 #include <linux/timer.h>
37 #include <linux/bug.h>
38 #include <linux/bitops.h>
39 #include <linux/irq.h>
40 #include <linux/io.h>
41 #include <linux/swab.h>
42 #include <linux/phy.h>
43 #include <linux/smsc911x.h>
44 #include <linux/device.h>
45 #include <linux/of.h>
46 #include <linux/of_device.h>
47 #include <linux/of_gpio.h>
48 #include <linux/of_net.h>
49 #include <linux/acpi.h>
50 #include <linux/pm_runtime.h>
51 #include <linux/property.h>
52 #include <linux/gpio/consumer.h>
53 
54 #include "smsc911x.h"
55 
56 #define SMSC_CHIPNAME		"smsc911x"
57 #define SMSC_MDIONAME		"smsc911x-mdio"
58 #define SMSC_DRV_VERSION	"2008-10-21"
59 
60 MODULE_LICENSE("GPL");
61 MODULE_VERSION(SMSC_DRV_VERSION);
62 MODULE_ALIAS("platform:smsc911x");
63 
64 #if USE_DEBUG > 0
65 static int debug = 16;
66 #else
67 static int debug = 3;
68 #endif
69 
70 module_param(debug, int, 0);
71 MODULE_PARM_DESC(debug, "Debug level (0=none,...,16=all)");
72 
73 struct smsc911x_data;
74 
75 struct smsc911x_ops {
76 	u32 (*reg_read)(struct smsc911x_data *pdata, u32 reg);
77 	void (*reg_write)(struct smsc911x_data *pdata, u32 reg, u32 val);
78 	void (*rx_readfifo)(struct smsc911x_data *pdata,
79 				unsigned int *buf, unsigned int wordcount);
80 	void (*tx_writefifo)(struct smsc911x_data *pdata,
81 				unsigned int *buf, unsigned int wordcount);
82 };
83 
84 #define SMSC911X_NUM_SUPPLIES 2
85 
86 struct smsc911x_data {
87 	void __iomem *ioaddr;
88 
89 	unsigned int idrev;
90 
91 	/* used to decide which workarounds apply */
92 	unsigned int generation;
93 
94 	/* device configuration (copied from platform_data during probe) */
95 	struct smsc911x_platform_config config;
96 
97 	/* This needs to be acquired before calling any of below:
98 	 * smsc911x_mac_read(), smsc911x_mac_write()
99 	 */
100 	spinlock_t mac_lock;
101 
102 	/* spinlock to ensure register accesses are serialised */
103 	spinlock_t dev_lock;
104 
105 	struct mii_bus *mii_bus;
106 	unsigned int using_extphy;
107 	int last_duplex;
108 	int last_carrier;
109 
110 	u32 msg_enable;
111 	unsigned int gpio_setting;
112 	unsigned int gpio_orig_setting;
113 	struct net_device *dev;
114 	struct napi_struct napi;
115 
116 	unsigned int software_irq_signal;
117 
118 #ifdef USE_PHY_WORK_AROUND
119 #define MIN_PACKET_SIZE (64)
120 	char loopback_tx_pkt[MIN_PACKET_SIZE];
121 	char loopback_rx_pkt[MIN_PACKET_SIZE];
122 	unsigned int resetcount;
123 #endif
124 
125 	/* Members for Multicast filter workaround */
126 	unsigned int multicast_update_pending;
127 	unsigned int set_bits_mask;
128 	unsigned int clear_bits_mask;
129 	unsigned int hashhi;
130 	unsigned int hashlo;
131 
132 	/* register access functions */
133 	const struct smsc911x_ops *ops;
134 
135 	/* regulators */
136 	struct regulator_bulk_data supplies[SMSC911X_NUM_SUPPLIES];
137 
138 	/* Reset GPIO */
139 	struct gpio_desc *reset_gpiod;
140 
141 	/* clock */
142 	struct clk *clk;
143 };
144 
145 /* Easy access to information */
146 #define __smsc_shift(pdata, reg) ((reg) << ((pdata)->config.shift))
147 
148 static inline u32 __smsc911x_reg_read(struct smsc911x_data *pdata, u32 reg)
149 {
150 	if (pdata->config.flags & SMSC911X_USE_32BIT)
151 		return readl(pdata->ioaddr + reg);
152 
153 	if (pdata->config.flags & SMSC911X_USE_16BIT)
154 		return ((readw(pdata->ioaddr + reg) & 0xFFFF) |
155 			((readw(pdata->ioaddr + reg + 2) & 0xFFFF) << 16));
156 
157 	BUG();
158 	return 0;
159 }
160 
161 static inline u32
162 __smsc911x_reg_read_shift(struct smsc911x_data *pdata, u32 reg)
163 {
164 	if (pdata->config.flags & SMSC911X_USE_32BIT)
165 		return readl(pdata->ioaddr + __smsc_shift(pdata, reg));
166 
167 	if (pdata->config.flags & SMSC911X_USE_16BIT)
168 		return (readw(pdata->ioaddr +
169 				__smsc_shift(pdata, reg)) & 0xFFFF) |
170 			((readw(pdata->ioaddr +
171 			__smsc_shift(pdata, reg + 2)) & 0xFFFF) << 16);
172 
173 	BUG();
174 	return 0;
175 }
176 
177 static inline u32 smsc911x_reg_read(struct smsc911x_data *pdata, u32 reg)
178 {
179 	u32 data;
180 	unsigned long flags;
181 
182 	spin_lock_irqsave(&pdata->dev_lock, flags);
183 	data = pdata->ops->reg_read(pdata, reg);
184 	spin_unlock_irqrestore(&pdata->dev_lock, flags);
185 
186 	return data;
187 }
188 
189 static inline void __smsc911x_reg_write(struct smsc911x_data *pdata, u32 reg,
190 					u32 val)
191 {
192 	if (pdata->config.flags & SMSC911X_USE_32BIT) {
193 		writel(val, pdata->ioaddr + reg);
194 		return;
195 	}
196 
197 	if (pdata->config.flags & SMSC911X_USE_16BIT) {
198 		writew(val & 0xFFFF, pdata->ioaddr + reg);
199 		writew((val >> 16) & 0xFFFF, pdata->ioaddr + reg + 2);
200 		return;
201 	}
202 
203 	BUG();
204 }
205 
206 static inline void
207 __smsc911x_reg_write_shift(struct smsc911x_data *pdata, u32 reg, u32 val)
208 {
209 	if (pdata->config.flags & SMSC911X_USE_32BIT) {
210 		writel(val, pdata->ioaddr + __smsc_shift(pdata, reg));
211 		return;
212 	}
213 
214 	if (pdata->config.flags & SMSC911X_USE_16BIT) {
215 		writew(val & 0xFFFF,
216 			pdata->ioaddr + __smsc_shift(pdata, reg));
217 		writew((val >> 16) & 0xFFFF,
218 			pdata->ioaddr + __smsc_shift(pdata, reg + 2));
219 		return;
220 	}
221 
222 	BUG();
223 }
224 
225 static inline void smsc911x_reg_write(struct smsc911x_data *pdata, u32 reg,
226 				      u32 val)
227 {
228 	unsigned long flags;
229 
230 	spin_lock_irqsave(&pdata->dev_lock, flags);
231 	pdata->ops->reg_write(pdata, reg, val);
232 	spin_unlock_irqrestore(&pdata->dev_lock, flags);
233 }
234 
235 /* Writes a packet to the TX_DATA_FIFO */
236 static inline void
237 smsc911x_tx_writefifo(struct smsc911x_data *pdata, unsigned int *buf,
238 		      unsigned int wordcount)
239 {
240 	unsigned long flags;
241 
242 	spin_lock_irqsave(&pdata->dev_lock, flags);
243 
244 	if (pdata->config.flags & SMSC911X_SWAP_FIFO) {
245 		while (wordcount--)
246 			__smsc911x_reg_write(pdata, TX_DATA_FIFO,
247 					     swab32(*buf++));
248 		goto out;
249 	}
250 
251 	if (pdata->config.flags & SMSC911X_USE_32BIT) {
252 		iowrite32_rep(pdata->ioaddr + TX_DATA_FIFO, buf, wordcount);
253 		goto out;
254 	}
255 
256 	if (pdata->config.flags & SMSC911X_USE_16BIT) {
257 		while (wordcount--)
258 			__smsc911x_reg_write(pdata, TX_DATA_FIFO, *buf++);
259 		goto out;
260 	}
261 
262 	BUG();
263 out:
264 	spin_unlock_irqrestore(&pdata->dev_lock, flags);
265 }
266 
267 /* Writes a packet to the TX_DATA_FIFO - shifted version */
268 static inline void
269 smsc911x_tx_writefifo_shift(struct smsc911x_data *pdata, unsigned int *buf,
270 		      unsigned int wordcount)
271 {
272 	unsigned long flags;
273 
274 	spin_lock_irqsave(&pdata->dev_lock, flags);
275 
276 	if (pdata->config.flags & SMSC911X_SWAP_FIFO) {
277 		while (wordcount--)
278 			__smsc911x_reg_write_shift(pdata, TX_DATA_FIFO,
279 					     swab32(*buf++));
280 		goto out;
281 	}
282 
283 	if (pdata->config.flags & SMSC911X_USE_32BIT) {
284 		iowrite32_rep(pdata->ioaddr + __smsc_shift(pdata,
285 						TX_DATA_FIFO), buf, wordcount);
286 		goto out;
287 	}
288 
289 	if (pdata->config.flags & SMSC911X_USE_16BIT) {
290 		while (wordcount--)
291 			__smsc911x_reg_write_shift(pdata,
292 						 TX_DATA_FIFO, *buf++);
293 		goto out;
294 	}
295 
296 	BUG();
297 out:
298 	spin_unlock_irqrestore(&pdata->dev_lock, flags);
299 }
300 
301 /* Reads a packet out of the RX_DATA_FIFO */
302 static inline void
303 smsc911x_rx_readfifo(struct smsc911x_data *pdata, unsigned int *buf,
304 		     unsigned int wordcount)
305 {
306 	unsigned long flags;
307 
308 	spin_lock_irqsave(&pdata->dev_lock, flags);
309 
310 	if (pdata->config.flags & SMSC911X_SWAP_FIFO) {
311 		while (wordcount--)
312 			*buf++ = swab32(__smsc911x_reg_read(pdata,
313 							    RX_DATA_FIFO));
314 		goto out;
315 	}
316 
317 	if (pdata->config.flags & SMSC911X_USE_32BIT) {
318 		ioread32_rep(pdata->ioaddr + RX_DATA_FIFO, buf, wordcount);
319 		goto out;
320 	}
321 
322 	if (pdata->config.flags & SMSC911X_USE_16BIT) {
323 		while (wordcount--)
324 			*buf++ = __smsc911x_reg_read(pdata, RX_DATA_FIFO);
325 		goto out;
326 	}
327 
328 	BUG();
329 out:
330 	spin_unlock_irqrestore(&pdata->dev_lock, flags);
331 }
332 
333 /* Reads a packet out of the RX_DATA_FIFO - shifted version */
334 static inline void
335 smsc911x_rx_readfifo_shift(struct smsc911x_data *pdata, unsigned int *buf,
336 		     unsigned int wordcount)
337 {
338 	unsigned long flags;
339 
340 	spin_lock_irqsave(&pdata->dev_lock, flags);
341 
342 	if (pdata->config.flags & SMSC911X_SWAP_FIFO) {
343 		while (wordcount--)
344 			*buf++ = swab32(__smsc911x_reg_read_shift(pdata,
345 							    RX_DATA_FIFO));
346 		goto out;
347 	}
348 
349 	if (pdata->config.flags & SMSC911X_USE_32BIT) {
350 		ioread32_rep(pdata->ioaddr + __smsc_shift(pdata,
351 						RX_DATA_FIFO), buf, wordcount);
352 		goto out;
353 	}
354 
355 	if (pdata->config.flags & SMSC911X_USE_16BIT) {
356 		while (wordcount--)
357 			*buf++ = __smsc911x_reg_read_shift(pdata,
358 								RX_DATA_FIFO);
359 		goto out;
360 	}
361 
362 	BUG();
363 out:
364 	spin_unlock_irqrestore(&pdata->dev_lock, flags);
365 }
366 
367 /*
368  * enable regulator and clock resources.
369  */
370 static int smsc911x_enable_resources(struct platform_device *pdev)
371 {
372 	struct net_device *ndev = platform_get_drvdata(pdev);
373 	struct smsc911x_data *pdata = netdev_priv(ndev);
374 	int ret = 0;
375 
376 	ret = regulator_bulk_enable(ARRAY_SIZE(pdata->supplies),
377 			pdata->supplies);
378 	if (ret)
379 		netdev_err(ndev, "failed to enable regulators %d\n",
380 				ret);
381 
382 	if (!IS_ERR(pdata->clk)) {
383 		ret = clk_prepare_enable(pdata->clk);
384 		if (ret < 0)
385 			netdev_err(ndev, "failed to enable clock %d\n", ret);
386 	}
387 
388 	return ret;
389 }
390 
391 /*
392  * disable resources, currently just regulators.
393  */
394 static int smsc911x_disable_resources(struct platform_device *pdev)
395 {
396 	struct net_device *ndev = platform_get_drvdata(pdev);
397 	struct smsc911x_data *pdata = netdev_priv(ndev);
398 	int ret = 0;
399 
400 	ret = regulator_bulk_disable(ARRAY_SIZE(pdata->supplies),
401 			pdata->supplies);
402 
403 	if (!IS_ERR(pdata->clk))
404 		clk_disable_unprepare(pdata->clk);
405 
406 	return ret;
407 }
408 
409 /*
410  * Request resources, currently just regulators.
411  *
412  * The SMSC911x has two power pins: vddvario and vdd33a, in designs where
413  * these are not always-on we need to request regulators to be turned on
414  * before we can try to access the device registers.
415  */
416 static int smsc911x_request_resources(struct platform_device *pdev)
417 {
418 	struct net_device *ndev = platform_get_drvdata(pdev);
419 	struct smsc911x_data *pdata = netdev_priv(ndev);
420 	int ret = 0;
421 
422 	/* Request regulators */
423 	pdata->supplies[0].supply = "vdd33a";
424 	pdata->supplies[1].supply = "vddvario";
425 	ret = regulator_bulk_get(&pdev->dev,
426 			ARRAY_SIZE(pdata->supplies),
427 			pdata->supplies);
428 	if (ret) {
429 		/*
430 		 * Retry on deferrals, else just report the error
431 		 * and try to continue.
432 		 */
433 		if (ret == -EPROBE_DEFER)
434 			return ret;
435 		netdev_err(ndev, "couldn't get regulators %d\n",
436 				ret);
437 	}
438 
439 	/* Request optional RESET GPIO */
440 	pdata->reset_gpiod = devm_gpiod_get_optional(&pdev->dev,
441 						     "reset",
442 						     GPIOD_OUT_LOW);
443 
444 	/* Request clock */
445 	pdata->clk = clk_get(&pdev->dev, NULL);
446 	if (IS_ERR(pdata->clk))
447 		dev_dbg(&pdev->dev, "couldn't get clock %li\n",
448 			PTR_ERR(pdata->clk));
449 
450 	return ret;
451 }
452 
453 /*
454  * Free resources, currently just regulators.
455  *
456  */
457 static void smsc911x_free_resources(struct platform_device *pdev)
458 {
459 	struct net_device *ndev = platform_get_drvdata(pdev);
460 	struct smsc911x_data *pdata = netdev_priv(ndev);
461 
462 	/* Free regulators */
463 	regulator_bulk_free(ARRAY_SIZE(pdata->supplies),
464 			pdata->supplies);
465 
466 	/* Free clock */
467 	if (!IS_ERR(pdata->clk)) {
468 		clk_put(pdata->clk);
469 		pdata->clk = NULL;
470 	}
471 }
472 
473 /* waits for MAC not busy, with timeout.  Only called by smsc911x_mac_read
474  * and smsc911x_mac_write, so assumes mac_lock is held */
475 static int smsc911x_mac_complete(struct smsc911x_data *pdata)
476 {
477 	int i;
478 	u32 val;
479 
480 	SMSC_ASSERT_MAC_LOCK(pdata);
481 
482 	for (i = 0; i < 40; i++) {
483 		val = smsc911x_reg_read(pdata, MAC_CSR_CMD);
484 		if (!(val & MAC_CSR_CMD_CSR_BUSY_))
485 			return 0;
486 	}
487 	SMSC_WARN(pdata, hw, "Timed out waiting for MAC not BUSY. "
488 		  "MAC_CSR_CMD: 0x%08X", val);
489 	return -EIO;
490 }
491 
492 /* Fetches a MAC register value. Assumes mac_lock is acquired */
493 static u32 smsc911x_mac_read(struct smsc911x_data *pdata, unsigned int offset)
494 {
495 	unsigned int temp;
496 
497 	SMSC_ASSERT_MAC_LOCK(pdata);
498 
499 	temp = smsc911x_reg_read(pdata, MAC_CSR_CMD);
500 	if (unlikely(temp & MAC_CSR_CMD_CSR_BUSY_)) {
501 		SMSC_WARN(pdata, hw, "MAC busy at entry");
502 		return 0xFFFFFFFF;
503 	}
504 
505 	/* Send the MAC cmd */
506 	smsc911x_reg_write(pdata, MAC_CSR_CMD, ((offset & 0xFF) |
507 		MAC_CSR_CMD_CSR_BUSY_ | MAC_CSR_CMD_R_NOT_W_));
508 
509 	/* Workaround for hardware read-after-write restriction */
510 	temp = smsc911x_reg_read(pdata, BYTE_TEST);
511 
512 	/* Wait for the read to complete */
513 	if (likely(smsc911x_mac_complete(pdata) == 0))
514 		return smsc911x_reg_read(pdata, MAC_CSR_DATA);
515 
516 	SMSC_WARN(pdata, hw, "MAC busy after read");
517 	return 0xFFFFFFFF;
518 }
519 
520 /* Set a mac register, mac_lock must be acquired before calling */
521 static void smsc911x_mac_write(struct smsc911x_data *pdata,
522 			       unsigned int offset, u32 val)
523 {
524 	unsigned int temp;
525 
526 	SMSC_ASSERT_MAC_LOCK(pdata);
527 
528 	temp = smsc911x_reg_read(pdata, MAC_CSR_CMD);
529 	if (unlikely(temp & MAC_CSR_CMD_CSR_BUSY_)) {
530 		SMSC_WARN(pdata, hw,
531 			  "smsc911x_mac_write failed, MAC busy at entry");
532 		return;
533 	}
534 
535 	/* Send data to write */
536 	smsc911x_reg_write(pdata, MAC_CSR_DATA, val);
537 
538 	/* Write the actual data */
539 	smsc911x_reg_write(pdata, MAC_CSR_CMD, ((offset & 0xFF) |
540 		MAC_CSR_CMD_CSR_BUSY_));
541 
542 	/* Workaround for hardware read-after-write restriction */
543 	temp = smsc911x_reg_read(pdata, BYTE_TEST);
544 
545 	/* Wait for the write to complete */
546 	if (likely(smsc911x_mac_complete(pdata) == 0))
547 		return;
548 
549 	SMSC_WARN(pdata, hw, "smsc911x_mac_write failed, MAC busy after write");
550 }
551 
552 /* Get a phy register */
553 static int smsc911x_mii_read(struct mii_bus *bus, int phyaddr, int regidx)
554 {
555 	struct smsc911x_data *pdata = (struct smsc911x_data *)bus->priv;
556 	unsigned long flags;
557 	unsigned int addr;
558 	int i, reg;
559 
560 	pm_runtime_get_sync(bus->parent);
561 	spin_lock_irqsave(&pdata->mac_lock, flags);
562 
563 	/* Confirm MII not busy */
564 	if (unlikely(smsc911x_mac_read(pdata, MII_ACC) & MII_ACC_MII_BUSY_)) {
565 		SMSC_WARN(pdata, hw, "MII is busy in smsc911x_mii_read???");
566 		reg = -EIO;
567 		goto out;
568 	}
569 
570 	/* Set the address, index & direction (read from PHY) */
571 	addr = ((phyaddr & 0x1F) << 11) | ((regidx & 0x1F) << 6);
572 	smsc911x_mac_write(pdata, MII_ACC, addr);
573 
574 	/* Wait for read to complete w/ timeout */
575 	for (i = 0; i < 100; i++)
576 		if (!(smsc911x_mac_read(pdata, MII_ACC) & MII_ACC_MII_BUSY_)) {
577 			reg = smsc911x_mac_read(pdata, MII_DATA);
578 			goto out;
579 		}
580 
581 	SMSC_WARN(pdata, hw, "Timed out waiting for MII read to finish");
582 	reg = -EIO;
583 
584 out:
585 	spin_unlock_irqrestore(&pdata->mac_lock, flags);
586 	pm_runtime_put(bus->parent);
587 	return reg;
588 }
589 
590 /* Set a phy register */
591 static int smsc911x_mii_write(struct mii_bus *bus, int phyaddr, int regidx,
592 			   u16 val)
593 {
594 	struct smsc911x_data *pdata = (struct smsc911x_data *)bus->priv;
595 	unsigned long flags;
596 	unsigned int addr;
597 	int i, reg;
598 
599 	pm_runtime_get_sync(bus->parent);
600 	spin_lock_irqsave(&pdata->mac_lock, flags);
601 
602 	/* Confirm MII not busy */
603 	if (unlikely(smsc911x_mac_read(pdata, MII_ACC) & MII_ACC_MII_BUSY_)) {
604 		SMSC_WARN(pdata, hw, "MII is busy in smsc911x_mii_write???");
605 		reg = -EIO;
606 		goto out;
607 	}
608 
609 	/* Put the data to write in the MAC */
610 	smsc911x_mac_write(pdata, MII_DATA, val);
611 
612 	/* Set the address, index & direction (write to PHY) */
613 	addr = ((phyaddr & 0x1F) << 11) | ((regidx & 0x1F) << 6) |
614 		MII_ACC_MII_WRITE_;
615 	smsc911x_mac_write(pdata, MII_ACC, addr);
616 
617 	/* Wait for write to complete w/ timeout */
618 	for (i = 0; i < 100; i++)
619 		if (!(smsc911x_mac_read(pdata, MII_ACC) & MII_ACC_MII_BUSY_)) {
620 			reg = 0;
621 			goto out;
622 		}
623 
624 	SMSC_WARN(pdata, hw, "Timed out waiting for MII write to finish");
625 	reg = -EIO;
626 
627 out:
628 	spin_unlock_irqrestore(&pdata->mac_lock, flags);
629 	pm_runtime_put(bus->parent);
630 	return reg;
631 }
632 
633 /* Switch to external phy. Assumes tx and rx are stopped. */
634 static void smsc911x_phy_enable_external(struct smsc911x_data *pdata)
635 {
636 	unsigned int hwcfg = smsc911x_reg_read(pdata, HW_CFG);
637 
638 	/* Disable phy clocks to the MAC */
639 	hwcfg &= (~HW_CFG_PHY_CLK_SEL_);
640 	hwcfg |= HW_CFG_PHY_CLK_SEL_CLK_DIS_;
641 	smsc911x_reg_write(pdata, HW_CFG, hwcfg);
642 	udelay(10);	/* Enough time for clocks to stop */
643 
644 	/* Switch to external phy */
645 	hwcfg |= HW_CFG_EXT_PHY_EN_;
646 	smsc911x_reg_write(pdata, HW_CFG, hwcfg);
647 
648 	/* Enable phy clocks to the MAC */
649 	hwcfg &= (~HW_CFG_PHY_CLK_SEL_);
650 	hwcfg |= HW_CFG_PHY_CLK_SEL_EXT_PHY_;
651 	smsc911x_reg_write(pdata, HW_CFG, hwcfg);
652 	udelay(10);	/* Enough time for clocks to restart */
653 
654 	hwcfg |= HW_CFG_SMI_SEL_;
655 	smsc911x_reg_write(pdata, HW_CFG, hwcfg);
656 }
657 
658 /* Autodetects and enables external phy if present on supported chips.
659  * autodetection can be overridden by specifying SMSC911X_FORCE_INTERNAL_PHY
660  * or SMSC911X_FORCE_EXTERNAL_PHY in the platform_data flags. */
661 static void smsc911x_phy_initialise_external(struct smsc911x_data *pdata)
662 {
663 	unsigned int hwcfg = smsc911x_reg_read(pdata, HW_CFG);
664 
665 	if (pdata->config.flags & SMSC911X_FORCE_INTERNAL_PHY) {
666 		SMSC_TRACE(pdata, hw, "Forcing internal PHY");
667 		pdata->using_extphy = 0;
668 	} else if (pdata->config.flags & SMSC911X_FORCE_EXTERNAL_PHY) {
669 		SMSC_TRACE(pdata, hw, "Forcing external PHY");
670 		smsc911x_phy_enable_external(pdata);
671 		pdata->using_extphy = 1;
672 	} else if (hwcfg & HW_CFG_EXT_PHY_DET_) {
673 		SMSC_TRACE(pdata, hw,
674 			   "HW_CFG EXT_PHY_DET set, using external PHY");
675 		smsc911x_phy_enable_external(pdata);
676 		pdata->using_extphy = 1;
677 	} else {
678 		SMSC_TRACE(pdata, hw,
679 			   "HW_CFG EXT_PHY_DET clear, using internal PHY");
680 		pdata->using_extphy = 0;
681 	}
682 }
683 
684 /* Fetches a tx status out of the status fifo */
685 static unsigned int smsc911x_tx_get_txstatus(struct smsc911x_data *pdata)
686 {
687 	unsigned int result =
688 	    smsc911x_reg_read(pdata, TX_FIFO_INF) & TX_FIFO_INF_TSUSED_;
689 
690 	if (result != 0)
691 		result = smsc911x_reg_read(pdata, TX_STATUS_FIFO);
692 
693 	return result;
694 }
695 
696 /* Fetches the next rx status */
697 static unsigned int smsc911x_rx_get_rxstatus(struct smsc911x_data *pdata)
698 {
699 	unsigned int result =
700 	    smsc911x_reg_read(pdata, RX_FIFO_INF) & RX_FIFO_INF_RXSUSED_;
701 
702 	if (result != 0)
703 		result = smsc911x_reg_read(pdata, RX_STATUS_FIFO);
704 
705 	return result;
706 }
707 
708 #ifdef USE_PHY_WORK_AROUND
709 static int smsc911x_phy_check_loopbackpkt(struct smsc911x_data *pdata)
710 {
711 	unsigned int tries;
712 	u32 wrsz;
713 	u32 rdsz;
714 	ulong bufp;
715 
716 	for (tries = 0; tries < 10; tries++) {
717 		unsigned int txcmd_a;
718 		unsigned int txcmd_b;
719 		unsigned int status;
720 		unsigned int pktlength;
721 		unsigned int i;
722 
723 		/* Zero-out rx packet memory */
724 		memset(pdata->loopback_rx_pkt, 0, MIN_PACKET_SIZE);
725 
726 		/* Write tx packet to 118 */
727 		txcmd_a = (u32)((ulong)pdata->loopback_tx_pkt & 0x03) << 16;
728 		txcmd_a |= TX_CMD_A_FIRST_SEG_ | TX_CMD_A_LAST_SEG_;
729 		txcmd_a |= MIN_PACKET_SIZE;
730 
731 		txcmd_b = MIN_PACKET_SIZE << 16 | MIN_PACKET_SIZE;
732 
733 		smsc911x_reg_write(pdata, TX_DATA_FIFO, txcmd_a);
734 		smsc911x_reg_write(pdata, TX_DATA_FIFO, txcmd_b);
735 
736 		bufp = (ulong)pdata->loopback_tx_pkt & (~0x3);
737 		wrsz = MIN_PACKET_SIZE + 3;
738 		wrsz += (u32)((ulong)pdata->loopback_tx_pkt & 0x3);
739 		wrsz >>= 2;
740 
741 		pdata->ops->tx_writefifo(pdata, (unsigned int *)bufp, wrsz);
742 
743 		/* Wait till transmit is done */
744 		i = 60;
745 		do {
746 			udelay(5);
747 			status = smsc911x_tx_get_txstatus(pdata);
748 		} while ((i--) && (!status));
749 
750 		if (!status) {
751 			SMSC_WARN(pdata, hw,
752 				  "Failed to transmit during loopback test");
753 			continue;
754 		}
755 		if (status & TX_STS_ES_) {
756 			SMSC_WARN(pdata, hw,
757 				  "Transmit encountered errors during loopback test");
758 			continue;
759 		}
760 
761 		/* Wait till receive is done */
762 		i = 60;
763 		do {
764 			udelay(5);
765 			status = smsc911x_rx_get_rxstatus(pdata);
766 		} while ((i--) && (!status));
767 
768 		if (!status) {
769 			SMSC_WARN(pdata, hw,
770 				  "Failed to receive during loopback test");
771 			continue;
772 		}
773 		if (status & RX_STS_ES_) {
774 			SMSC_WARN(pdata, hw,
775 				  "Receive encountered errors during loopback test");
776 			continue;
777 		}
778 
779 		pktlength = ((status & 0x3FFF0000UL) >> 16);
780 		bufp = (ulong)pdata->loopback_rx_pkt;
781 		rdsz = pktlength + 3;
782 		rdsz += (u32)((ulong)pdata->loopback_rx_pkt & 0x3);
783 		rdsz >>= 2;
784 
785 		pdata->ops->rx_readfifo(pdata, (unsigned int *)bufp, rdsz);
786 
787 		if (pktlength != (MIN_PACKET_SIZE + 4)) {
788 			SMSC_WARN(pdata, hw, "Unexpected packet size "
789 				  "during loop back test, size=%d, will retry",
790 				  pktlength);
791 		} else {
792 			unsigned int j;
793 			int mismatch = 0;
794 			for (j = 0; j < MIN_PACKET_SIZE; j++) {
795 				if (pdata->loopback_tx_pkt[j]
796 				    != pdata->loopback_rx_pkt[j]) {
797 					mismatch = 1;
798 					break;
799 				}
800 			}
801 			if (!mismatch) {
802 				SMSC_TRACE(pdata, hw, "Successfully verified "
803 					   "loopback packet");
804 				return 0;
805 			} else {
806 				SMSC_WARN(pdata, hw, "Data mismatch "
807 					  "during loop back test, will retry");
808 			}
809 		}
810 	}
811 
812 	return -EIO;
813 }
814 
815 static int smsc911x_phy_reset(struct smsc911x_data *pdata)
816 {
817 	unsigned int temp;
818 	unsigned int i = 100000;
819 
820 	temp = smsc911x_reg_read(pdata, PMT_CTRL);
821 	smsc911x_reg_write(pdata, PMT_CTRL, temp | PMT_CTRL_PHY_RST_);
822 	do {
823 		msleep(1);
824 		temp = smsc911x_reg_read(pdata, PMT_CTRL);
825 	} while ((i--) && (temp & PMT_CTRL_PHY_RST_));
826 
827 	if (unlikely(temp & PMT_CTRL_PHY_RST_)) {
828 		SMSC_WARN(pdata, hw, "PHY reset failed to complete");
829 		return -EIO;
830 	}
831 	/* Extra delay required because the phy may not be completed with
832 	* its reset when BMCR_RESET is cleared. Specs say 256 uS is
833 	* enough delay but using 1ms here to be safe */
834 	msleep(1);
835 
836 	return 0;
837 }
838 
839 static int smsc911x_phy_loopbacktest(struct net_device *dev)
840 {
841 	struct smsc911x_data *pdata = netdev_priv(dev);
842 	struct phy_device *phy_dev = dev->phydev;
843 	int result = -EIO;
844 	unsigned int i, val;
845 	unsigned long flags;
846 
847 	/* Initialise tx packet using broadcast destination address */
848 	eth_broadcast_addr(pdata->loopback_tx_pkt);
849 
850 	/* Use incrementing source address */
851 	for (i = 6; i < 12; i++)
852 		pdata->loopback_tx_pkt[i] = (char)i;
853 
854 	/* Set length type field */
855 	pdata->loopback_tx_pkt[12] = 0x00;
856 	pdata->loopback_tx_pkt[13] = 0x00;
857 
858 	for (i = 14; i < MIN_PACKET_SIZE; i++)
859 		pdata->loopback_tx_pkt[i] = (char)i;
860 
861 	val = smsc911x_reg_read(pdata, HW_CFG);
862 	val &= HW_CFG_TX_FIF_SZ_;
863 	val |= HW_CFG_SF_;
864 	smsc911x_reg_write(pdata, HW_CFG, val);
865 
866 	smsc911x_reg_write(pdata, TX_CFG, TX_CFG_TX_ON_);
867 	smsc911x_reg_write(pdata, RX_CFG,
868 		(u32)((ulong)pdata->loopback_rx_pkt & 0x03) << 8);
869 
870 	for (i = 0; i < 10; i++) {
871 		/* Set PHY to 10/FD, no ANEG, and loopback mode */
872 		smsc911x_mii_write(phy_dev->mdio.bus, phy_dev->mdio.addr,
873 				   MII_BMCR, BMCR_LOOPBACK | BMCR_FULLDPLX);
874 
875 		/* Enable MAC tx/rx, FD */
876 		spin_lock_irqsave(&pdata->mac_lock, flags);
877 		smsc911x_mac_write(pdata, MAC_CR, MAC_CR_FDPX_
878 				   | MAC_CR_TXEN_ | MAC_CR_RXEN_);
879 		spin_unlock_irqrestore(&pdata->mac_lock, flags);
880 
881 		if (smsc911x_phy_check_loopbackpkt(pdata) == 0) {
882 			result = 0;
883 			break;
884 		}
885 		pdata->resetcount++;
886 
887 		/* Disable MAC rx */
888 		spin_lock_irqsave(&pdata->mac_lock, flags);
889 		smsc911x_mac_write(pdata, MAC_CR, 0);
890 		spin_unlock_irqrestore(&pdata->mac_lock, flags);
891 
892 		smsc911x_phy_reset(pdata);
893 	}
894 
895 	/* Disable MAC */
896 	spin_lock_irqsave(&pdata->mac_lock, flags);
897 	smsc911x_mac_write(pdata, MAC_CR, 0);
898 	spin_unlock_irqrestore(&pdata->mac_lock, flags);
899 
900 	/* Cancel PHY loopback mode */
901 	smsc911x_mii_write(phy_dev->mdio.bus, phy_dev->mdio.addr, MII_BMCR, 0);
902 
903 	smsc911x_reg_write(pdata, TX_CFG, 0);
904 	smsc911x_reg_write(pdata, RX_CFG, 0);
905 
906 	return result;
907 }
908 #endif				/* USE_PHY_WORK_AROUND */
909 
910 static void smsc911x_phy_update_flowcontrol(struct smsc911x_data *pdata)
911 {
912 	struct net_device *ndev = pdata->dev;
913 	struct phy_device *phy_dev = ndev->phydev;
914 	u32 afc = smsc911x_reg_read(pdata, AFC_CFG);
915 	u32 flow;
916 	unsigned long flags;
917 
918 	if (phy_dev->duplex == DUPLEX_FULL) {
919 		u16 lcladv = phy_read(phy_dev, MII_ADVERTISE);
920 		u16 rmtadv = phy_read(phy_dev, MII_LPA);
921 		u8 cap = mii_resolve_flowctrl_fdx(lcladv, rmtadv);
922 
923 		if (cap & FLOW_CTRL_RX)
924 			flow = 0xFFFF0002;
925 		else
926 			flow = 0;
927 
928 		if (cap & FLOW_CTRL_TX)
929 			afc |= 0xF;
930 		else
931 			afc &= ~0xF;
932 
933 		SMSC_TRACE(pdata, hw, "rx pause %s, tx pause %s",
934 			   (cap & FLOW_CTRL_RX ? "enabled" : "disabled"),
935 			   (cap & FLOW_CTRL_TX ? "enabled" : "disabled"));
936 	} else {
937 		SMSC_TRACE(pdata, hw, "half duplex");
938 		flow = 0;
939 		afc |= 0xF;
940 	}
941 
942 	spin_lock_irqsave(&pdata->mac_lock, flags);
943 	smsc911x_mac_write(pdata, FLOW, flow);
944 	spin_unlock_irqrestore(&pdata->mac_lock, flags);
945 
946 	smsc911x_reg_write(pdata, AFC_CFG, afc);
947 }
948 
949 /* Update link mode if anything has changed.  Called periodically when the
950  * PHY is in polling mode, even if nothing has changed. */
951 static void smsc911x_phy_adjust_link(struct net_device *dev)
952 {
953 	struct smsc911x_data *pdata = netdev_priv(dev);
954 	struct phy_device *phy_dev = dev->phydev;
955 	unsigned long flags;
956 	int carrier;
957 
958 	if (phy_dev->duplex != pdata->last_duplex) {
959 		unsigned int mac_cr;
960 		SMSC_TRACE(pdata, hw, "duplex state has changed");
961 
962 		spin_lock_irqsave(&pdata->mac_lock, flags);
963 		mac_cr = smsc911x_mac_read(pdata, MAC_CR);
964 		if (phy_dev->duplex) {
965 			SMSC_TRACE(pdata, hw,
966 				   "configuring for full duplex mode");
967 			mac_cr |= MAC_CR_FDPX_;
968 		} else {
969 			SMSC_TRACE(pdata, hw,
970 				   "configuring for half duplex mode");
971 			mac_cr &= ~MAC_CR_FDPX_;
972 		}
973 		smsc911x_mac_write(pdata, MAC_CR, mac_cr);
974 		spin_unlock_irqrestore(&pdata->mac_lock, flags);
975 
976 		smsc911x_phy_update_flowcontrol(pdata);
977 		pdata->last_duplex = phy_dev->duplex;
978 	}
979 
980 	carrier = netif_carrier_ok(dev);
981 	if (carrier != pdata->last_carrier) {
982 		SMSC_TRACE(pdata, hw, "carrier state has changed");
983 		if (carrier) {
984 			SMSC_TRACE(pdata, hw, "configuring for carrier OK");
985 			if ((pdata->gpio_orig_setting & GPIO_CFG_LED1_EN_) &&
986 			    (!pdata->using_extphy)) {
987 				/* Restore original GPIO configuration */
988 				pdata->gpio_setting = pdata->gpio_orig_setting;
989 				smsc911x_reg_write(pdata, GPIO_CFG,
990 					pdata->gpio_setting);
991 			}
992 		} else {
993 			SMSC_TRACE(pdata, hw, "configuring for no carrier");
994 			/* Check global setting that LED1
995 			 * usage is 10/100 indicator */
996 			pdata->gpio_setting = smsc911x_reg_read(pdata,
997 				GPIO_CFG);
998 			if ((pdata->gpio_setting & GPIO_CFG_LED1_EN_) &&
999 			    (!pdata->using_extphy)) {
1000 				/* Force 10/100 LED off, after saving
1001 				 * original GPIO configuration */
1002 				pdata->gpio_orig_setting = pdata->gpio_setting;
1003 
1004 				pdata->gpio_setting &= ~GPIO_CFG_LED1_EN_;
1005 				pdata->gpio_setting |= (GPIO_CFG_GPIOBUF0_
1006 							| GPIO_CFG_GPIODIR0_
1007 							| GPIO_CFG_GPIOD0_);
1008 				smsc911x_reg_write(pdata, GPIO_CFG,
1009 					pdata->gpio_setting);
1010 			}
1011 		}
1012 		pdata->last_carrier = carrier;
1013 	}
1014 }
1015 
1016 static int smsc911x_mii_probe(struct net_device *dev)
1017 {
1018 	struct smsc911x_data *pdata = netdev_priv(dev);
1019 	struct phy_device *phydev = NULL;
1020 	int ret;
1021 
1022 	/* find the first phy */
1023 	phydev = phy_find_first(pdata->mii_bus);
1024 	if (!phydev) {
1025 		netdev_err(dev, "no PHY found\n");
1026 		return -ENODEV;
1027 	}
1028 
1029 	SMSC_TRACE(pdata, probe, "PHY: addr %d, phy_id 0x%08X",
1030 		   phydev->mdio.addr, phydev->phy_id);
1031 
1032 	ret = phy_connect_direct(dev, phydev, &smsc911x_phy_adjust_link,
1033 				 pdata->config.phy_interface);
1034 
1035 	if (ret) {
1036 		netdev_err(dev, "Could not attach to PHY\n");
1037 		return ret;
1038 	}
1039 
1040 	phy_attached_info(phydev);
1041 
1042 	phy_set_max_speed(phydev, SPEED_100);
1043 
1044 	/* mask with MAC supported features */
1045 	phy_support_asym_pause(phydev);
1046 
1047 	pdata->last_duplex = -1;
1048 	pdata->last_carrier = -1;
1049 
1050 #ifdef USE_PHY_WORK_AROUND
1051 	if (smsc911x_phy_loopbacktest(dev) < 0) {
1052 		SMSC_WARN(pdata, hw, "Failed Loop Back Test");
1053 		phy_disconnect(phydev);
1054 		return -ENODEV;
1055 	}
1056 	SMSC_TRACE(pdata, hw, "Passed Loop Back Test");
1057 #endif				/* USE_PHY_WORK_AROUND */
1058 
1059 	SMSC_TRACE(pdata, hw, "phy initialised successfully");
1060 	return 0;
1061 }
1062 
1063 static int smsc911x_mii_init(struct platform_device *pdev,
1064 			     struct net_device *dev)
1065 {
1066 	struct smsc911x_data *pdata = netdev_priv(dev);
1067 	int err = -ENXIO;
1068 
1069 	pdata->mii_bus = mdiobus_alloc();
1070 	if (!pdata->mii_bus) {
1071 		err = -ENOMEM;
1072 		goto err_out_1;
1073 	}
1074 
1075 	pdata->mii_bus->name = SMSC_MDIONAME;
1076 	snprintf(pdata->mii_bus->id, MII_BUS_ID_SIZE, "%s-%x",
1077 		pdev->name, pdev->id);
1078 	pdata->mii_bus->priv = pdata;
1079 	pdata->mii_bus->read = smsc911x_mii_read;
1080 	pdata->mii_bus->write = smsc911x_mii_write;
1081 
1082 	pdata->mii_bus->parent = &pdev->dev;
1083 
1084 	switch (pdata->idrev & 0xFFFF0000) {
1085 	case 0x01170000:
1086 	case 0x01150000:
1087 	case 0x117A0000:
1088 	case 0x115A0000:
1089 		/* External PHY supported, try to autodetect */
1090 		smsc911x_phy_initialise_external(pdata);
1091 		break;
1092 	default:
1093 		SMSC_TRACE(pdata, hw, "External PHY is not supported, "
1094 			   "using internal PHY");
1095 		pdata->using_extphy = 0;
1096 		break;
1097 	}
1098 
1099 	if (!pdata->using_extphy) {
1100 		/* Mask all PHYs except ID 1 (internal) */
1101 		pdata->mii_bus->phy_mask = ~(1 << 1);
1102 	}
1103 
1104 	if (mdiobus_register(pdata->mii_bus)) {
1105 		SMSC_WARN(pdata, probe, "Error registering mii bus");
1106 		goto err_out_free_bus_2;
1107 	}
1108 
1109 	return 0;
1110 
1111 err_out_free_bus_2:
1112 	mdiobus_free(pdata->mii_bus);
1113 err_out_1:
1114 	return err;
1115 }
1116 
1117 /* Gets the number of tx statuses in the fifo */
1118 static unsigned int smsc911x_tx_get_txstatcount(struct smsc911x_data *pdata)
1119 {
1120 	return (smsc911x_reg_read(pdata, TX_FIFO_INF)
1121 		& TX_FIFO_INF_TSUSED_) >> 16;
1122 }
1123 
1124 /* Reads tx statuses and increments counters where necessary */
1125 static void smsc911x_tx_update_txcounters(struct net_device *dev)
1126 {
1127 	struct smsc911x_data *pdata = netdev_priv(dev);
1128 	unsigned int tx_stat;
1129 
1130 	while ((tx_stat = smsc911x_tx_get_txstatus(pdata)) != 0) {
1131 		if (unlikely(tx_stat & 0x80000000)) {
1132 			/* In this driver the packet tag is used as the packet
1133 			 * length. Since a packet length can never reach the
1134 			 * size of 0x8000, this bit is reserved. It is worth
1135 			 * noting that the "reserved bit" in the warning above
1136 			 * does not reference a hardware defined reserved bit
1137 			 * but rather a driver defined one.
1138 			 */
1139 			SMSC_WARN(pdata, hw, "Packet tag reserved bit is high");
1140 		} else {
1141 			if (unlikely(tx_stat & TX_STS_ES_)) {
1142 				dev->stats.tx_errors++;
1143 			} else {
1144 				dev->stats.tx_packets++;
1145 				dev->stats.tx_bytes += (tx_stat >> 16);
1146 			}
1147 			if (unlikely(tx_stat & TX_STS_EXCESS_COL_)) {
1148 				dev->stats.collisions += 16;
1149 				dev->stats.tx_aborted_errors += 1;
1150 			} else {
1151 				dev->stats.collisions +=
1152 				    ((tx_stat >> 3) & 0xF);
1153 			}
1154 			if (unlikely(tx_stat & TX_STS_LOST_CARRIER_))
1155 				dev->stats.tx_carrier_errors += 1;
1156 			if (unlikely(tx_stat & TX_STS_LATE_COL_)) {
1157 				dev->stats.collisions++;
1158 				dev->stats.tx_aborted_errors++;
1159 			}
1160 		}
1161 	}
1162 }
1163 
1164 /* Increments the Rx error counters */
1165 static void
1166 smsc911x_rx_counterrors(struct net_device *dev, unsigned int rxstat)
1167 {
1168 	int crc_err = 0;
1169 
1170 	if (unlikely(rxstat & RX_STS_ES_)) {
1171 		dev->stats.rx_errors++;
1172 		if (unlikely(rxstat & RX_STS_CRC_ERR_)) {
1173 			dev->stats.rx_crc_errors++;
1174 			crc_err = 1;
1175 		}
1176 	}
1177 	if (likely(!crc_err)) {
1178 		if (unlikely((rxstat & RX_STS_FRAME_TYPE_) &&
1179 			     (rxstat & RX_STS_LENGTH_ERR_)))
1180 			dev->stats.rx_length_errors++;
1181 		if (rxstat & RX_STS_MCAST_)
1182 			dev->stats.multicast++;
1183 	}
1184 }
1185 
1186 /* Quickly dumps bad packets */
1187 static void
1188 smsc911x_rx_fastforward(struct smsc911x_data *pdata, unsigned int pktwords)
1189 {
1190 	if (likely(pktwords >= 4)) {
1191 		unsigned int timeout = 500;
1192 		unsigned int val;
1193 		smsc911x_reg_write(pdata, RX_DP_CTRL, RX_DP_CTRL_RX_FFWD_);
1194 		do {
1195 			udelay(1);
1196 			val = smsc911x_reg_read(pdata, RX_DP_CTRL);
1197 		} while ((val & RX_DP_CTRL_RX_FFWD_) && --timeout);
1198 
1199 		if (unlikely(timeout == 0))
1200 			SMSC_WARN(pdata, hw, "Timed out waiting for "
1201 				  "RX FFWD to finish, RX_DP_CTRL: 0x%08X", val);
1202 	} else {
1203 		while (pktwords--)
1204 			smsc911x_reg_read(pdata, RX_DATA_FIFO);
1205 	}
1206 }
1207 
1208 /* NAPI poll function */
1209 static int smsc911x_poll(struct napi_struct *napi, int budget)
1210 {
1211 	struct smsc911x_data *pdata =
1212 		container_of(napi, struct smsc911x_data, napi);
1213 	struct net_device *dev = pdata->dev;
1214 	int npackets = 0;
1215 
1216 	while (npackets < budget) {
1217 		unsigned int pktlength;
1218 		unsigned int pktwords;
1219 		struct sk_buff *skb;
1220 		unsigned int rxstat = smsc911x_rx_get_rxstatus(pdata);
1221 
1222 		if (!rxstat) {
1223 			unsigned int temp;
1224 			/* We processed all packets available.  Tell NAPI it can
1225 			 * stop polling then re-enable rx interrupts */
1226 			smsc911x_reg_write(pdata, INT_STS, INT_STS_RSFL_);
1227 			napi_complete(napi);
1228 			temp = smsc911x_reg_read(pdata, INT_EN);
1229 			temp |= INT_EN_RSFL_EN_;
1230 			smsc911x_reg_write(pdata, INT_EN, temp);
1231 			break;
1232 		}
1233 
1234 		/* Count packet for NAPI scheduling, even if it has an error.
1235 		 * Error packets still require cycles to discard */
1236 		npackets++;
1237 
1238 		pktlength = ((rxstat & 0x3FFF0000) >> 16);
1239 		pktwords = (pktlength + NET_IP_ALIGN + 3) >> 2;
1240 		smsc911x_rx_counterrors(dev, rxstat);
1241 
1242 		if (unlikely(rxstat & RX_STS_ES_)) {
1243 			SMSC_WARN(pdata, rx_err,
1244 				  "Discarding packet with error bit set");
1245 			/* Packet has an error, discard it and continue with
1246 			 * the next */
1247 			smsc911x_rx_fastforward(pdata, pktwords);
1248 			dev->stats.rx_dropped++;
1249 			continue;
1250 		}
1251 
1252 		skb = netdev_alloc_skb(dev, pktwords << 2);
1253 		if (unlikely(!skb)) {
1254 			SMSC_WARN(pdata, rx_err,
1255 				  "Unable to allocate skb for rx packet");
1256 			/* Drop the packet and stop this polling iteration */
1257 			smsc911x_rx_fastforward(pdata, pktwords);
1258 			dev->stats.rx_dropped++;
1259 			break;
1260 		}
1261 
1262 		pdata->ops->rx_readfifo(pdata,
1263 				 (unsigned int *)skb->data, pktwords);
1264 
1265 		/* Align IP on 16B boundary */
1266 		skb_reserve(skb, NET_IP_ALIGN);
1267 		skb_put(skb, pktlength - 4);
1268 		skb->protocol = eth_type_trans(skb, dev);
1269 		skb_checksum_none_assert(skb);
1270 		netif_receive_skb(skb);
1271 
1272 		/* Update counters */
1273 		dev->stats.rx_packets++;
1274 		dev->stats.rx_bytes += (pktlength - 4);
1275 	}
1276 
1277 	/* Return total received packets */
1278 	return npackets;
1279 }
1280 
1281 /* Returns hash bit number for given MAC address
1282  * Example:
1283  * 01 00 5E 00 00 01 -> returns bit number 31 */
1284 static unsigned int smsc911x_hash(char addr[ETH_ALEN])
1285 {
1286 	return (ether_crc(ETH_ALEN, addr) >> 26) & 0x3f;
1287 }
1288 
1289 static void smsc911x_rx_multicast_update(struct smsc911x_data *pdata)
1290 {
1291 	/* Performs the multicast & mac_cr update.  This is called when
1292 	 * safe on the current hardware, and with the mac_lock held */
1293 	unsigned int mac_cr;
1294 
1295 	SMSC_ASSERT_MAC_LOCK(pdata);
1296 
1297 	mac_cr = smsc911x_mac_read(pdata, MAC_CR);
1298 	mac_cr |= pdata->set_bits_mask;
1299 	mac_cr &= ~(pdata->clear_bits_mask);
1300 	smsc911x_mac_write(pdata, MAC_CR, mac_cr);
1301 	smsc911x_mac_write(pdata, HASHH, pdata->hashhi);
1302 	smsc911x_mac_write(pdata, HASHL, pdata->hashlo);
1303 	SMSC_TRACE(pdata, hw, "maccr 0x%08X, HASHH 0x%08X, HASHL 0x%08X",
1304 		   mac_cr, pdata->hashhi, pdata->hashlo);
1305 }
1306 
1307 static void smsc911x_rx_multicast_update_workaround(struct smsc911x_data *pdata)
1308 {
1309 	unsigned int mac_cr;
1310 
1311 	/* This function is only called for older LAN911x devices
1312 	 * (revA or revB), where MAC_CR, HASHH and HASHL should not
1313 	 * be modified during Rx - newer devices immediately update the
1314 	 * registers.
1315 	 *
1316 	 * This is called from interrupt context */
1317 
1318 	spin_lock(&pdata->mac_lock);
1319 
1320 	/* Check Rx has stopped */
1321 	if (smsc911x_mac_read(pdata, MAC_CR) & MAC_CR_RXEN_)
1322 		SMSC_WARN(pdata, drv, "Rx not stopped");
1323 
1324 	/* Perform the update - safe to do now Rx has stopped */
1325 	smsc911x_rx_multicast_update(pdata);
1326 
1327 	/* Re-enable Rx */
1328 	mac_cr = smsc911x_mac_read(pdata, MAC_CR);
1329 	mac_cr |= MAC_CR_RXEN_;
1330 	smsc911x_mac_write(pdata, MAC_CR, mac_cr);
1331 
1332 	pdata->multicast_update_pending = 0;
1333 
1334 	spin_unlock(&pdata->mac_lock);
1335 }
1336 
1337 static int smsc911x_phy_general_power_up(struct smsc911x_data *pdata)
1338 {
1339 	struct net_device *ndev = pdata->dev;
1340 	struct phy_device *phy_dev = ndev->phydev;
1341 	int rc = 0;
1342 
1343 	if (!phy_dev)
1344 		return rc;
1345 
1346 	/* If the internal PHY is in General Power-Down mode, all, except the
1347 	 * management interface, is powered-down and stays in that condition as
1348 	 * long as Phy register bit 0.11 is HIGH.
1349 	 *
1350 	 * In that case, clear the bit 0.11, so the PHY powers up and we can
1351 	 * access to the phy registers.
1352 	 */
1353 	rc = phy_read(phy_dev, MII_BMCR);
1354 	if (rc < 0) {
1355 		SMSC_WARN(pdata, drv, "Failed reading PHY control reg");
1356 		return rc;
1357 	}
1358 
1359 	/* If the PHY general power-down bit is not set is not necessary to
1360 	 * disable the general power down-mode.
1361 	 */
1362 	if (rc & BMCR_PDOWN) {
1363 		rc = phy_write(phy_dev, MII_BMCR, rc & ~BMCR_PDOWN);
1364 		if (rc < 0) {
1365 			SMSC_WARN(pdata, drv, "Failed writing PHY control reg");
1366 			return rc;
1367 		}
1368 
1369 		usleep_range(1000, 1500);
1370 	}
1371 
1372 	return 0;
1373 }
1374 
1375 static int smsc911x_phy_disable_energy_detect(struct smsc911x_data *pdata)
1376 {
1377 	struct net_device *ndev = pdata->dev;
1378 	struct phy_device *phy_dev = ndev->phydev;
1379 	int rc = 0;
1380 
1381 	if (!phy_dev)
1382 		return rc;
1383 
1384 	rc = phy_read(phy_dev, MII_LAN83C185_CTRL_STATUS);
1385 
1386 	if (rc < 0) {
1387 		SMSC_WARN(pdata, drv, "Failed reading PHY control reg");
1388 		return rc;
1389 	}
1390 
1391 	/* Only disable if energy detect mode is already enabled */
1392 	if (rc & MII_LAN83C185_EDPWRDOWN) {
1393 		/* Disable energy detect mode for this SMSC Transceivers */
1394 		rc = phy_write(phy_dev, MII_LAN83C185_CTRL_STATUS,
1395 			       rc & (~MII_LAN83C185_EDPWRDOWN));
1396 
1397 		if (rc < 0) {
1398 			SMSC_WARN(pdata, drv, "Failed writing PHY control reg");
1399 			return rc;
1400 		}
1401 		/* Allow PHY to wakeup */
1402 		mdelay(2);
1403 	}
1404 
1405 	return 0;
1406 }
1407 
1408 static int smsc911x_phy_enable_energy_detect(struct smsc911x_data *pdata)
1409 {
1410 	struct net_device *ndev = pdata->dev;
1411 	struct phy_device *phy_dev = ndev->phydev;
1412 	int rc = 0;
1413 
1414 	if (!phy_dev)
1415 		return rc;
1416 
1417 	rc = phy_read(phy_dev, MII_LAN83C185_CTRL_STATUS);
1418 
1419 	if (rc < 0) {
1420 		SMSC_WARN(pdata, drv, "Failed reading PHY control reg");
1421 		return rc;
1422 	}
1423 
1424 	/* Only enable if energy detect mode is already disabled */
1425 	if (!(rc & MII_LAN83C185_EDPWRDOWN)) {
1426 		/* Enable energy detect mode for this SMSC Transceivers */
1427 		rc = phy_write(phy_dev, MII_LAN83C185_CTRL_STATUS,
1428 			       rc | MII_LAN83C185_EDPWRDOWN);
1429 
1430 		if (rc < 0) {
1431 			SMSC_WARN(pdata, drv, "Failed writing PHY control reg");
1432 			return rc;
1433 		}
1434 	}
1435 	return 0;
1436 }
1437 
1438 static int smsc911x_soft_reset(struct smsc911x_data *pdata)
1439 {
1440 	unsigned int timeout;
1441 	unsigned int temp;
1442 	int ret;
1443 	unsigned int reset_offset = HW_CFG;
1444 	unsigned int reset_mask = HW_CFG_SRST_;
1445 
1446 	/*
1447 	 * Make sure to power-up the PHY chip before doing a reset, otherwise
1448 	 * the reset fails.
1449 	 */
1450 	ret = smsc911x_phy_general_power_up(pdata);
1451 	if (ret) {
1452 		SMSC_WARN(pdata, drv, "Failed to power-up the PHY chip");
1453 		return ret;
1454 	}
1455 
1456 	/*
1457 	 * LAN9210/LAN9211/LAN9220/LAN9221 chips have an internal PHY that
1458 	 * are initialized in a Energy Detect Power-Down mode that prevents
1459 	 * the MAC chip to be software reseted. So we have to wakeup the PHY
1460 	 * before.
1461 	 */
1462 	if (pdata->generation == 4) {
1463 		ret = smsc911x_phy_disable_energy_detect(pdata);
1464 
1465 		if (ret) {
1466 			SMSC_WARN(pdata, drv, "Failed to wakeup the PHY chip");
1467 			return ret;
1468 		}
1469 	}
1470 
1471 	if ((pdata->idrev & 0xFFFF0000) == LAN9250) {
1472 		/* special reset for  LAN9250 */
1473 		reset_offset = RESET_CTL;
1474 		reset_mask = RESET_CTL_DIGITAL_RST_;
1475 	}
1476 
1477 	/* Reset the LAN911x */
1478 	smsc911x_reg_write(pdata, reset_offset, reset_mask);
1479 
1480 	/* verify reset bit is cleared */
1481 	timeout = 10;
1482 	do {
1483 		udelay(10);
1484 		temp = smsc911x_reg_read(pdata, reset_offset);
1485 	} while ((--timeout) && (temp & reset_mask));
1486 
1487 	if (unlikely(temp & reset_mask)) {
1488 		SMSC_WARN(pdata, drv, "Failed to complete reset");
1489 		return -EIO;
1490 	}
1491 
1492 	if (pdata->generation == 4) {
1493 		ret = smsc911x_phy_enable_energy_detect(pdata);
1494 
1495 		if (ret) {
1496 			SMSC_WARN(pdata, drv, "Failed to wakeup the PHY chip");
1497 			return ret;
1498 		}
1499 	}
1500 
1501 	return 0;
1502 }
1503 
1504 /* Sets the device MAC address to dev_addr, called with mac_lock held */
1505 static void
1506 smsc911x_set_hw_mac_address(struct smsc911x_data *pdata, const u8 dev_addr[6])
1507 {
1508 	u32 mac_high16 = (dev_addr[5] << 8) | dev_addr[4];
1509 	u32 mac_low32 = (dev_addr[3] << 24) | (dev_addr[2] << 16) |
1510 	    (dev_addr[1] << 8) | dev_addr[0];
1511 
1512 	SMSC_ASSERT_MAC_LOCK(pdata);
1513 
1514 	smsc911x_mac_write(pdata, ADDRH, mac_high16);
1515 	smsc911x_mac_write(pdata, ADDRL, mac_low32);
1516 }
1517 
1518 static void smsc911x_disable_irq_chip(struct net_device *dev)
1519 {
1520 	struct smsc911x_data *pdata = netdev_priv(dev);
1521 
1522 	smsc911x_reg_write(pdata, INT_EN, 0);
1523 	smsc911x_reg_write(pdata, INT_STS, 0xFFFFFFFF);
1524 }
1525 
1526 static irqreturn_t smsc911x_irqhandler(int irq, void *dev_id)
1527 {
1528 	struct net_device *dev = dev_id;
1529 	struct smsc911x_data *pdata = netdev_priv(dev);
1530 	u32 intsts = smsc911x_reg_read(pdata, INT_STS);
1531 	u32 inten = smsc911x_reg_read(pdata, INT_EN);
1532 	int serviced = IRQ_NONE;
1533 	u32 temp;
1534 
1535 	if (unlikely(intsts & inten & INT_STS_SW_INT_)) {
1536 		temp = smsc911x_reg_read(pdata, INT_EN);
1537 		temp &= (~INT_EN_SW_INT_EN_);
1538 		smsc911x_reg_write(pdata, INT_EN, temp);
1539 		smsc911x_reg_write(pdata, INT_STS, INT_STS_SW_INT_);
1540 		pdata->software_irq_signal = 1;
1541 		smp_wmb();
1542 		serviced = IRQ_HANDLED;
1543 	}
1544 
1545 	if (unlikely(intsts & inten & INT_STS_RXSTOP_INT_)) {
1546 		/* Called when there is a multicast update scheduled and
1547 		 * it is now safe to complete the update */
1548 		SMSC_TRACE(pdata, intr, "RX Stop interrupt");
1549 		smsc911x_reg_write(pdata, INT_STS, INT_STS_RXSTOP_INT_);
1550 		if (pdata->multicast_update_pending)
1551 			smsc911x_rx_multicast_update_workaround(pdata);
1552 		serviced = IRQ_HANDLED;
1553 	}
1554 
1555 	if (intsts & inten & INT_STS_TDFA_) {
1556 		temp = smsc911x_reg_read(pdata, FIFO_INT);
1557 		temp |= FIFO_INT_TX_AVAIL_LEVEL_;
1558 		smsc911x_reg_write(pdata, FIFO_INT, temp);
1559 		smsc911x_reg_write(pdata, INT_STS, INT_STS_TDFA_);
1560 		netif_wake_queue(dev);
1561 		serviced = IRQ_HANDLED;
1562 	}
1563 
1564 	if (unlikely(intsts & inten & INT_STS_RXE_)) {
1565 		SMSC_TRACE(pdata, intr, "RX Error interrupt");
1566 		smsc911x_reg_write(pdata, INT_STS, INT_STS_RXE_);
1567 		serviced = IRQ_HANDLED;
1568 	}
1569 
1570 	if (likely(intsts & inten & INT_STS_RSFL_)) {
1571 		if (likely(napi_schedule_prep(&pdata->napi))) {
1572 			/* Disable Rx interrupts */
1573 			temp = smsc911x_reg_read(pdata, INT_EN);
1574 			temp &= (~INT_EN_RSFL_EN_);
1575 			smsc911x_reg_write(pdata, INT_EN, temp);
1576 			/* Schedule a NAPI poll */
1577 			__napi_schedule(&pdata->napi);
1578 		} else {
1579 			SMSC_WARN(pdata, rx_err, "napi_schedule_prep failed");
1580 		}
1581 		serviced = IRQ_HANDLED;
1582 	}
1583 
1584 	return serviced;
1585 }
1586 
1587 static int smsc911x_open(struct net_device *dev)
1588 {
1589 	struct smsc911x_data *pdata = netdev_priv(dev);
1590 	unsigned int timeout;
1591 	unsigned int temp;
1592 	unsigned int intcfg;
1593 	int retval;
1594 	int irq_flags;
1595 
1596 	pm_runtime_get_sync(dev->dev.parent);
1597 
1598 	/* find and start the given phy */
1599 	if (!dev->phydev) {
1600 		retval = smsc911x_mii_probe(dev);
1601 		if (retval < 0) {
1602 			SMSC_WARN(pdata, probe, "Error starting phy");
1603 			goto out;
1604 		}
1605 	}
1606 
1607 	/* Reset the LAN911x */
1608 	retval = smsc911x_soft_reset(pdata);
1609 	if (retval) {
1610 		SMSC_WARN(pdata, hw, "soft reset failed");
1611 		goto mii_free_out;
1612 	}
1613 
1614 	smsc911x_reg_write(pdata, HW_CFG, 0x00050000);
1615 	smsc911x_reg_write(pdata, AFC_CFG, 0x006E3740);
1616 
1617 	/* Increase the legal frame size of VLAN tagged frames to 1522 bytes */
1618 	spin_lock_irq(&pdata->mac_lock);
1619 	smsc911x_mac_write(pdata, VLAN1, ETH_P_8021Q);
1620 	spin_unlock_irq(&pdata->mac_lock);
1621 
1622 	/* Make sure EEPROM has finished loading before setting GPIO_CFG */
1623 	timeout = 50;
1624 	while ((smsc911x_reg_read(pdata, E2P_CMD) & E2P_CMD_EPC_BUSY_) &&
1625 	       --timeout) {
1626 		udelay(10);
1627 	}
1628 
1629 	if (unlikely(timeout == 0))
1630 		SMSC_WARN(pdata, ifup,
1631 			  "Timed out waiting for EEPROM busy bit to clear");
1632 
1633 	smsc911x_reg_write(pdata, GPIO_CFG, 0x70070000);
1634 
1635 	/* The soft reset above cleared the device's MAC address,
1636 	 * restore it from local copy (set in probe) */
1637 	spin_lock_irq(&pdata->mac_lock);
1638 	smsc911x_set_hw_mac_address(pdata, dev->dev_addr);
1639 	spin_unlock_irq(&pdata->mac_lock);
1640 
1641 	/* Initialise irqs, but leave all sources disabled */
1642 	smsc911x_disable_irq_chip(dev);
1643 
1644 	/* Set interrupt deassertion to 100uS */
1645 	intcfg = ((10 << 24) | INT_CFG_IRQ_EN_);
1646 
1647 	if (pdata->config.irq_polarity) {
1648 		SMSC_TRACE(pdata, ifup, "irq polarity: active high");
1649 		intcfg |= INT_CFG_IRQ_POL_;
1650 	} else {
1651 		SMSC_TRACE(pdata, ifup, "irq polarity: active low");
1652 	}
1653 
1654 	if (pdata->config.irq_type) {
1655 		SMSC_TRACE(pdata, ifup, "irq type: push-pull");
1656 		intcfg |= INT_CFG_IRQ_TYPE_;
1657 	} else {
1658 		SMSC_TRACE(pdata, ifup, "irq type: open drain");
1659 	}
1660 
1661 	smsc911x_reg_write(pdata, INT_CFG, intcfg);
1662 
1663 	SMSC_TRACE(pdata, ifup, "Testing irq handler using IRQ %d", dev->irq);
1664 	pdata->software_irq_signal = 0;
1665 	smp_wmb();
1666 
1667 	irq_flags = irq_get_trigger_type(dev->irq);
1668 	retval = request_irq(dev->irq, smsc911x_irqhandler,
1669 			     irq_flags | IRQF_SHARED, dev->name, dev);
1670 	if (retval) {
1671 		SMSC_WARN(pdata, probe,
1672 			  "Unable to claim requested irq: %d", dev->irq);
1673 		goto mii_free_out;
1674 	}
1675 
1676 	temp = smsc911x_reg_read(pdata, INT_EN);
1677 	temp |= INT_EN_SW_INT_EN_;
1678 	smsc911x_reg_write(pdata, INT_EN, temp);
1679 
1680 	timeout = 1000;
1681 	while (timeout--) {
1682 		if (pdata->software_irq_signal)
1683 			break;
1684 		msleep(1);
1685 	}
1686 
1687 	if (!pdata->software_irq_signal) {
1688 		netdev_warn(dev, "ISR failed signaling test (IRQ %d)\n",
1689 			    dev->irq);
1690 		retval = -ENODEV;
1691 		goto irq_stop_out;
1692 	}
1693 	SMSC_TRACE(pdata, ifup, "IRQ handler passed test using IRQ %d",
1694 		   dev->irq);
1695 
1696 	netdev_info(dev, "SMSC911x/921x identified at %#08lx, IRQ: %d\n",
1697 		    (unsigned long)pdata->ioaddr, dev->irq);
1698 
1699 	/* Reset the last known duplex and carrier */
1700 	pdata->last_duplex = -1;
1701 	pdata->last_carrier = -1;
1702 
1703 	/* Bring the PHY up */
1704 	phy_start(dev->phydev);
1705 
1706 	temp = smsc911x_reg_read(pdata, HW_CFG);
1707 	/* Preserve TX FIFO size and external PHY configuration */
1708 	temp &= (HW_CFG_TX_FIF_SZ_|0x00000FFF);
1709 	temp |= HW_CFG_SF_;
1710 	smsc911x_reg_write(pdata, HW_CFG, temp);
1711 
1712 	temp = smsc911x_reg_read(pdata, FIFO_INT);
1713 	temp |= FIFO_INT_TX_AVAIL_LEVEL_;
1714 	temp &= ~(FIFO_INT_RX_STS_LEVEL_);
1715 	smsc911x_reg_write(pdata, FIFO_INT, temp);
1716 
1717 	/* set RX Data offset to 2 bytes for alignment */
1718 	smsc911x_reg_write(pdata, RX_CFG, (NET_IP_ALIGN << 8));
1719 
1720 	/* enable NAPI polling before enabling RX interrupts */
1721 	napi_enable(&pdata->napi);
1722 
1723 	temp = smsc911x_reg_read(pdata, INT_EN);
1724 	temp |= (INT_EN_TDFA_EN_ | INT_EN_RSFL_EN_ | INT_EN_RXSTOP_INT_EN_);
1725 	smsc911x_reg_write(pdata, INT_EN, temp);
1726 
1727 	spin_lock_irq(&pdata->mac_lock);
1728 	temp = smsc911x_mac_read(pdata, MAC_CR);
1729 	temp |= (MAC_CR_TXEN_ | MAC_CR_RXEN_ | MAC_CR_HBDIS_);
1730 	smsc911x_mac_write(pdata, MAC_CR, temp);
1731 	spin_unlock_irq(&pdata->mac_lock);
1732 
1733 	smsc911x_reg_write(pdata, TX_CFG, TX_CFG_TX_ON_);
1734 
1735 	netif_start_queue(dev);
1736 	return 0;
1737 
1738 irq_stop_out:
1739 	free_irq(dev->irq, dev);
1740 mii_free_out:
1741 	phy_disconnect(dev->phydev);
1742 	dev->phydev = NULL;
1743 out:
1744 	pm_runtime_put(dev->dev.parent);
1745 	return retval;
1746 }
1747 
1748 /* Entry point for stopping the interface */
1749 static int smsc911x_stop(struct net_device *dev)
1750 {
1751 	struct smsc911x_data *pdata = netdev_priv(dev);
1752 	unsigned int temp;
1753 
1754 	/* Disable all device interrupts */
1755 	temp = smsc911x_reg_read(pdata, INT_CFG);
1756 	temp &= ~INT_CFG_IRQ_EN_;
1757 	smsc911x_reg_write(pdata, INT_CFG, temp);
1758 
1759 	/* Stop Tx and Rx polling */
1760 	netif_stop_queue(dev);
1761 	napi_disable(&pdata->napi);
1762 
1763 	/* At this point all Rx and Tx activity is stopped */
1764 	dev->stats.rx_dropped += smsc911x_reg_read(pdata, RX_DROP);
1765 	smsc911x_tx_update_txcounters(dev);
1766 
1767 	free_irq(dev->irq, dev);
1768 
1769 	/* Bring the PHY down */
1770 	if (dev->phydev) {
1771 		phy_stop(dev->phydev);
1772 		phy_disconnect(dev->phydev);
1773 		dev->phydev = NULL;
1774 	}
1775 	netif_carrier_off(dev);
1776 	pm_runtime_put(dev->dev.parent);
1777 
1778 	SMSC_TRACE(pdata, ifdown, "Interface stopped");
1779 	return 0;
1780 }
1781 
1782 /* Entry point for transmitting a packet */
1783 static netdev_tx_t
1784 smsc911x_hard_start_xmit(struct sk_buff *skb, struct net_device *dev)
1785 {
1786 	struct smsc911x_data *pdata = netdev_priv(dev);
1787 	unsigned int freespace;
1788 	unsigned int tx_cmd_a;
1789 	unsigned int tx_cmd_b;
1790 	unsigned int temp;
1791 	u32 wrsz;
1792 	ulong bufp;
1793 
1794 	freespace = smsc911x_reg_read(pdata, TX_FIFO_INF) & TX_FIFO_INF_TDFREE_;
1795 
1796 	if (unlikely(freespace < TX_FIFO_LOW_THRESHOLD))
1797 		SMSC_WARN(pdata, tx_err,
1798 			  "Tx data fifo low, space available: %d", freespace);
1799 
1800 	/* Word alignment adjustment */
1801 	tx_cmd_a = (u32)((ulong)skb->data & 0x03) << 16;
1802 	tx_cmd_a |= TX_CMD_A_FIRST_SEG_ | TX_CMD_A_LAST_SEG_;
1803 	tx_cmd_a |= (unsigned int)skb->len;
1804 
1805 	tx_cmd_b = ((unsigned int)skb->len) << 16;
1806 	tx_cmd_b |= (unsigned int)skb->len;
1807 
1808 	smsc911x_reg_write(pdata, TX_DATA_FIFO, tx_cmd_a);
1809 	smsc911x_reg_write(pdata, TX_DATA_FIFO, tx_cmd_b);
1810 
1811 	bufp = (ulong)skb->data & (~0x3);
1812 	wrsz = (u32)skb->len + 3;
1813 	wrsz += (u32)((ulong)skb->data & 0x3);
1814 	wrsz >>= 2;
1815 
1816 	pdata->ops->tx_writefifo(pdata, (unsigned int *)bufp, wrsz);
1817 	freespace -= (skb->len + 32);
1818 	skb_tx_timestamp(skb);
1819 	dev_consume_skb_any(skb);
1820 
1821 	if (unlikely(smsc911x_tx_get_txstatcount(pdata) >= 30))
1822 		smsc911x_tx_update_txcounters(dev);
1823 
1824 	if (freespace < TX_FIFO_LOW_THRESHOLD) {
1825 		netif_stop_queue(dev);
1826 		temp = smsc911x_reg_read(pdata, FIFO_INT);
1827 		temp &= 0x00FFFFFF;
1828 		temp |= 0x32000000;
1829 		smsc911x_reg_write(pdata, FIFO_INT, temp);
1830 	}
1831 
1832 	return NETDEV_TX_OK;
1833 }
1834 
1835 /* Entry point for getting status counters */
1836 static struct net_device_stats *smsc911x_get_stats(struct net_device *dev)
1837 {
1838 	struct smsc911x_data *pdata = netdev_priv(dev);
1839 	smsc911x_tx_update_txcounters(dev);
1840 	dev->stats.rx_dropped += smsc911x_reg_read(pdata, RX_DROP);
1841 	return &dev->stats;
1842 }
1843 
1844 /* Entry point for setting addressing modes */
1845 static void smsc911x_set_multicast_list(struct net_device *dev)
1846 {
1847 	struct smsc911x_data *pdata = netdev_priv(dev);
1848 	unsigned long flags;
1849 
1850 	if (dev->flags & IFF_PROMISC) {
1851 		/* Enabling promiscuous mode */
1852 		pdata->set_bits_mask = MAC_CR_PRMS_;
1853 		pdata->clear_bits_mask = (MAC_CR_MCPAS_ | MAC_CR_HPFILT_);
1854 		pdata->hashhi = 0;
1855 		pdata->hashlo = 0;
1856 	} else if (dev->flags & IFF_ALLMULTI) {
1857 		/* Enabling all multicast mode */
1858 		pdata->set_bits_mask = MAC_CR_MCPAS_;
1859 		pdata->clear_bits_mask = (MAC_CR_PRMS_ | MAC_CR_HPFILT_);
1860 		pdata->hashhi = 0;
1861 		pdata->hashlo = 0;
1862 	} else if (!netdev_mc_empty(dev)) {
1863 		/* Enabling specific multicast addresses */
1864 		unsigned int hash_high = 0;
1865 		unsigned int hash_low = 0;
1866 		struct netdev_hw_addr *ha;
1867 
1868 		pdata->set_bits_mask = MAC_CR_HPFILT_;
1869 		pdata->clear_bits_mask = (MAC_CR_PRMS_ | MAC_CR_MCPAS_);
1870 
1871 		netdev_for_each_mc_addr(ha, dev) {
1872 			unsigned int bitnum = smsc911x_hash(ha->addr);
1873 			unsigned int mask = 0x01 << (bitnum & 0x1F);
1874 
1875 			if (bitnum & 0x20)
1876 				hash_high |= mask;
1877 			else
1878 				hash_low |= mask;
1879 		}
1880 
1881 		pdata->hashhi = hash_high;
1882 		pdata->hashlo = hash_low;
1883 	} else {
1884 		/* Enabling local MAC address only */
1885 		pdata->set_bits_mask = 0;
1886 		pdata->clear_bits_mask =
1887 		    (MAC_CR_PRMS_ | MAC_CR_MCPAS_ | MAC_CR_HPFILT_);
1888 		pdata->hashhi = 0;
1889 		pdata->hashlo = 0;
1890 	}
1891 
1892 	spin_lock_irqsave(&pdata->mac_lock, flags);
1893 
1894 	if (pdata->generation <= 1) {
1895 		/* Older hardware revision - cannot change these flags while
1896 		 * receiving data */
1897 		if (!pdata->multicast_update_pending) {
1898 			unsigned int temp;
1899 			SMSC_TRACE(pdata, hw, "scheduling mcast update");
1900 			pdata->multicast_update_pending = 1;
1901 
1902 			/* Request the hardware to stop, then perform the
1903 			 * update when we get an RX_STOP interrupt */
1904 			temp = smsc911x_mac_read(pdata, MAC_CR);
1905 			temp &= ~(MAC_CR_RXEN_);
1906 			smsc911x_mac_write(pdata, MAC_CR, temp);
1907 		} else {
1908 			/* There is another update pending, this should now
1909 			 * use the newer values */
1910 		}
1911 	} else {
1912 		/* Newer hardware revision - can write immediately */
1913 		smsc911x_rx_multicast_update(pdata);
1914 	}
1915 
1916 	spin_unlock_irqrestore(&pdata->mac_lock, flags);
1917 }
1918 
1919 #ifdef CONFIG_NET_POLL_CONTROLLER
1920 static void smsc911x_poll_controller(struct net_device *dev)
1921 {
1922 	disable_irq(dev->irq);
1923 	smsc911x_irqhandler(0, dev);
1924 	enable_irq(dev->irq);
1925 }
1926 #endif				/* CONFIG_NET_POLL_CONTROLLER */
1927 
1928 static int smsc911x_set_mac_address(struct net_device *dev, void *p)
1929 {
1930 	struct smsc911x_data *pdata = netdev_priv(dev);
1931 	struct sockaddr *addr = p;
1932 
1933 	/* On older hardware revisions we cannot change the mac address
1934 	 * registers while receiving data.  Newer devices can safely change
1935 	 * this at any time. */
1936 	if (pdata->generation <= 1 && netif_running(dev))
1937 		return -EBUSY;
1938 
1939 	if (!is_valid_ether_addr(addr->sa_data))
1940 		return -EADDRNOTAVAIL;
1941 
1942 	eth_hw_addr_set(dev, addr->sa_data);
1943 
1944 	spin_lock_irq(&pdata->mac_lock);
1945 	smsc911x_set_hw_mac_address(pdata, dev->dev_addr);
1946 	spin_unlock_irq(&pdata->mac_lock);
1947 
1948 	netdev_info(dev, "MAC Address: %pM\n", dev->dev_addr);
1949 
1950 	return 0;
1951 }
1952 
1953 static void smsc911x_ethtool_getdrvinfo(struct net_device *dev,
1954 					struct ethtool_drvinfo *info)
1955 {
1956 	strlcpy(info->driver, SMSC_CHIPNAME, sizeof(info->driver));
1957 	strlcpy(info->version, SMSC_DRV_VERSION, sizeof(info->version));
1958 	strlcpy(info->bus_info, dev_name(dev->dev.parent),
1959 		sizeof(info->bus_info));
1960 }
1961 
1962 static u32 smsc911x_ethtool_getmsglevel(struct net_device *dev)
1963 {
1964 	struct smsc911x_data *pdata = netdev_priv(dev);
1965 	return pdata->msg_enable;
1966 }
1967 
1968 static void smsc911x_ethtool_setmsglevel(struct net_device *dev, u32 level)
1969 {
1970 	struct smsc911x_data *pdata = netdev_priv(dev);
1971 	pdata->msg_enable = level;
1972 }
1973 
1974 static int smsc911x_ethtool_getregslen(struct net_device *dev)
1975 {
1976 	return (((E2P_DATA - ID_REV) / 4 + 1) + (WUCSR - MAC_CR) + 1 + 32) *
1977 	    sizeof(u32);
1978 }
1979 
1980 static void
1981 smsc911x_ethtool_getregs(struct net_device *dev, struct ethtool_regs *regs,
1982 			 void *buf)
1983 {
1984 	struct smsc911x_data *pdata = netdev_priv(dev);
1985 	struct phy_device *phy_dev = dev->phydev;
1986 	unsigned long flags;
1987 	unsigned int i;
1988 	unsigned int j = 0;
1989 	u32 *data = buf;
1990 
1991 	regs->version = pdata->idrev;
1992 	for (i = ID_REV; i <= E2P_DATA; i += (sizeof(u32)))
1993 		data[j++] = smsc911x_reg_read(pdata, i);
1994 
1995 	for (i = MAC_CR; i <= WUCSR; i++) {
1996 		spin_lock_irqsave(&pdata->mac_lock, flags);
1997 		data[j++] = smsc911x_mac_read(pdata, i);
1998 		spin_unlock_irqrestore(&pdata->mac_lock, flags);
1999 	}
2000 
2001 	for (i = 0; i <= 31; i++)
2002 		data[j++] = smsc911x_mii_read(phy_dev->mdio.bus,
2003 					      phy_dev->mdio.addr, i);
2004 }
2005 
2006 static void smsc911x_eeprom_enable_access(struct smsc911x_data *pdata)
2007 {
2008 	unsigned int temp = smsc911x_reg_read(pdata, GPIO_CFG);
2009 	temp &= ~GPIO_CFG_EEPR_EN_;
2010 	smsc911x_reg_write(pdata, GPIO_CFG, temp);
2011 	msleep(1);
2012 }
2013 
2014 static int smsc911x_eeprom_send_cmd(struct smsc911x_data *pdata, u32 op)
2015 {
2016 	int timeout = 100;
2017 	u32 e2cmd;
2018 
2019 	SMSC_TRACE(pdata, drv, "op 0x%08x", op);
2020 	if (smsc911x_reg_read(pdata, E2P_CMD) & E2P_CMD_EPC_BUSY_) {
2021 		SMSC_WARN(pdata, drv, "Busy at start");
2022 		return -EBUSY;
2023 	}
2024 
2025 	e2cmd = op | E2P_CMD_EPC_BUSY_;
2026 	smsc911x_reg_write(pdata, E2P_CMD, e2cmd);
2027 
2028 	do {
2029 		msleep(1);
2030 		e2cmd = smsc911x_reg_read(pdata, E2P_CMD);
2031 	} while ((e2cmd & E2P_CMD_EPC_BUSY_) && (--timeout));
2032 
2033 	if (!timeout) {
2034 		SMSC_TRACE(pdata, drv, "TIMED OUT");
2035 		return -EAGAIN;
2036 	}
2037 
2038 	if (e2cmd & E2P_CMD_EPC_TIMEOUT_) {
2039 		SMSC_TRACE(pdata, drv, "Error occurred during eeprom operation");
2040 		return -EINVAL;
2041 	}
2042 
2043 	return 0;
2044 }
2045 
2046 static int smsc911x_eeprom_read_location(struct smsc911x_data *pdata,
2047 					 u8 address, u8 *data)
2048 {
2049 	u32 op = E2P_CMD_EPC_CMD_READ_ | address;
2050 	int ret;
2051 
2052 	SMSC_TRACE(pdata, drv, "address 0x%x", address);
2053 	ret = smsc911x_eeprom_send_cmd(pdata, op);
2054 
2055 	if (!ret)
2056 		data[address] = smsc911x_reg_read(pdata, E2P_DATA);
2057 
2058 	return ret;
2059 }
2060 
2061 static int smsc911x_eeprom_write_location(struct smsc911x_data *pdata,
2062 					  u8 address, u8 data)
2063 {
2064 	u32 op = E2P_CMD_EPC_CMD_ERASE_ | address;
2065 	int ret;
2066 
2067 	SMSC_TRACE(pdata, drv, "address 0x%x, data 0x%x", address, data);
2068 	ret = smsc911x_eeprom_send_cmd(pdata, op);
2069 
2070 	if (!ret) {
2071 		op = E2P_CMD_EPC_CMD_WRITE_ | address;
2072 		smsc911x_reg_write(pdata, E2P_DATA, (u32)data);
2073 
2074 		/* Workaround for hardware read-after-write restriction */
2075 		smsc911x_reg_read(pdata, BYTE_TEST);
2076 
2077 		ret = smsc911x_eeprom_send_cmd(pdata, op);
2078 	}
2079 
2080 	return ret;
2081 }
2082 
2083 static int smsc911x_ethtool_get_eeprom_len(struct net_device *dev)
2084 {
2085 	return SMSC911X_EEPROM_SIZE;
2086 }
2087 
2088 static int smsc911x_ethtool_get_eeprom(struct net_device *dev,
2089 				       struct ethtool_eeprom *eeprom, u8 *data)
2090 {
2091 	struct smsc911x_data *pdata = netdev_priv(dev);
2092 	u8 eeprom_data[SMSC911X_EEPROM_SIZE];
2093 	int len;
2094 	int i;
2095 
2096 	smsc911x_eeprom_enable_access(pdata);
2097 
2098 	len = min(eeprom->len, SMSC911X_EEPROM_SIZE);
2099 	for (i = 0; i < len; i++) {
2100 		int ret = smsc911x_eeprom_read_location(pdata, i, eeprom_data);
2101 		if (ret < 0) {
2102 			eeprom->len = 0;
2103 			return ret;
2104 		}
2105 	}
2106 
2107 	memcpy(data, &eeprom_data[eeprom->offset], len);
2108 	eeprom->len = len;
2109 	return 0;
2110 }
2111 
2112 static int smsc911x_ethtool_set_eeprom(struct net_device *dev,
2113 				       struct ethtool_eeprom *eeprom, u8 *data)
2114 {
2115 	int ret;
2116 	struct smsc911x_data *pdata = netdev_priv(dev);
2117 
2118 	smsc911x_eeprom_enable_access(pdata);
2119 	smsc911x_eeprom_send_cmd(pdata, E2P_CMD_EPC_CMD_EWEN_);
2120 	ret = smsc911x_eeprom_write_location(pdata, eeprom->offset, *data);
2121 	smsc911x_eeprom_send_cmd(pdata, E2P_CMD_EPC_CMD_EWDS_);
2122 
2123 	/* Single byte write, according to man page */
2124 	eeprom->len = 1;
2125 
2126 	return ret;
2127 }
2128 
2129 static const struct ethtool_ops smsc911x_ethtool_ops = {
2130 	.get_link = ethtool_op_get_link,
2131 	.get_drvinfo = smsc911x_ethtool_getdrvinfo,
2132 	.nway_reset = phy_ethtool_nway_reset,
2133 	.get_msglevel = smsc911x_ethtool_getmsglevel,
2134 	.set_msglevel = smsc911x_ethtool_setmsglevel,
2135 	.get_regs_len = smsc911x_ethtool_getregslen,
2136 	.get_regs = smsc911x_ethtool_getregs,
2137 	.get_eeprom_len = smsc911x_ethtool_get_eeprom_len,
2138 	.get_eeprom = smsc911x_ethtool_get_eeprom,
2139 	.set_eeprom = smsc911x_ethtool_set_eeprom,
2140 	.get_ts_info = ethtool_op_get_ts_info,
2141 	.get_link_ksettings = phy_ethtool_get_link_ksettings,
2142 	.set_link_ksettings = phy_ethtool_set_link_ksettings,
2143 };
2144 
2145 static const struct net_device_ops smsc911x_netdev_ops = {
2146 	.ndo_open		= smsc911x_open,
2147 	.ndo_stop		= smsc911x_stop,
2148 	.ndo_start_xmit		= smsc911x_hard_start_xmit,
2149 	.ndo_get_stats		= smsc911x_get_stats,
2150 	.ndo_set_rx_mode	= smsc911x_set_multicast_list,
2151 	.ndo_eth_ioctl		= phy_do_ioctl_running,
2152 	.ndo_validate_addr	= eth_validate_addr,
2153 	.ndo_set_mac_address 	= smsc911x_set_mac_address,
2154 #ifdef CONFIG_NET_POLL_CONTROLLER
2155 	.ndo_poll_controller	= smsc911x_poll_controller,
2156 #endif
2157 };
2158 
2159 /* copies the current mac address from hardware to dev->dev_addr */
2160 static void smsc911x_read_mac_address(struct net_device *dev)
2161 {
2162 	struct smsc911x_data *pdata = netdev_priv(dev);
2163 	u32 mac_high16 = smsc911x_mac_read(pdata, ADDRH);
2164 	u32 mac_low32 = smsc911x_mac_read(pdata, ADDRL);
2165 	u8 addr[ETH_ALEN];
2166 
2167 	addr[0] = (u8)(mac_low32);
2168 	addr[1] = (u8)(mac_low32 >> 8);
2169 	addr[2] = (u8)(mac_low32 >> 16);
2170 	addr[3] = (u8)(mac_low32 >> 24);
2171 	addr[4] = (u8)(mac_high16);
2172 	addr[5] = (u8)(mac_high16 >> 8);
2173 	eth_hw_addr_set(dev, addr);
2174 }
2175 
2176 /* Initializing private device structures, only called from probe */
2177 static int smsc911x_init(struct net_device *dev)
2178 {
2179 	struct smsc911x_data *pdata = netdev_priv(dev);
2180 	unsigned int byte_test, mask;
2181 	unsigned int to = 100;
2182 
2183 	SMSC_TRACE(pdata, probe, "Driver Parameters:");
2184 	SMSC_TRACE(pdata, probe, "LAN base: 0x%08lX",
2185 		   (unsigned long)pdata->ioaddr);
2186 	SMSC_TRACE(pdata, probe, "IRQ: %d", dev->irq);
2187 	SMSC_TRACE(pdata, probe, "PHY will be autodetected.");
2188 
2189 	spin_lock_init(&pdata->dev_lock);
2190 	spin_lock_init(&pdata->mac_lock);
2191 
2192 	if (pdata->ioaddr == NULL) {
2193 		SMSC_WARN(pdata, probe, "pdata->ioaddr: 0x00000000");
2194 		return -ENODEV;
2195 	}
2196 
2197 	/*
2198 	 * poll the READY bit in PMT_CTRL. Any other access to the device is
2199 	 * forbidden while this bit isn't set. Try for 100ms
2200 	 *
2201 	 * Note that this test is done before the WORD_SWAP register is
2202 	 * programmed. So in some configurations the READY bit is at 16 before
2203 	 * WORD_SWAP is written to. This issue is worked around by waiting
2204 	 * until either bit 0 or bit 16 gets set in PMT_CTRL.
2205 	 *
2206 	 * SMSC has confirmed that checking bit 16 (marked as reserved in
2207 	 * the datasheet) is fine since these bits "will either never be set
2208 	 * or can only go high after READY does (so also indicate the device
2209 	 * is ready)".
2210 	 */
2211 
2212 	mask = PMT_CTRL_READY_ | swahw32(PMT_CTRL_READY_);
2213 	while (!(smsc911x_reg_read(pdata, PMT_CTRL) & mask) && --to)
2214 		udelay(1000);
2215 
2216 	if (to == 0) {
2217 		netdev_err(dev, "Device not READY in 100ms aborting\n");
2218 		return -ENODEV;
2219 	}
2220 
2221 	/* Check byte ordering */
2222 	byte_test = smsc911x_reg_read(pdata, BYTE_TEST);
2223 	SMSC_TRACE(pdata, probe, "BYTE_TEST: 0x%08X", byte_test);
2224 	if (byte_test == 0x43218765) {
2225 		SMSC_TRACE(pdata, probe, "BYTE_TEST looks swapped, "
2226 			   "applying WORD_SWAP");
2227 		smsc911x_reg_write(pdata, WORD_SWAP, 0xffffffff);
2228 
2229 		/* 1 dummy read of BYTE_TEST is needed after a write to
2230 		 * WORD_SWAP before its contents are valid */
2231 		byte_test = smsc911x_reg_read(pdata, BYTE_TEST);
2232 
2233 		byte_test = smsc911x_reg_read(pdata, BYTE_TEST);
2234 	}
2235 
2236 	if (byte_test != 0x87654321) {
2237 		SMSC_WARN(pdata, drv, "BYTE_TEST: 0x%08X", byte_test);
2238 		if (((byte_test >> 16) & 0xFFFF) == (byte_test & 0xFFFF)) {
2239 			SMSC_WARN(pdata, probe,
2240 				  "top 16 bits equal to bottom 16 bits");
2241 			SMSC_TRACE(pdata, probe,
2242 				   "This may mean the chip is set "
2243 				   "for 32 bit while the bus is reading 16 bit");
2244 		}
2245 		return -ENODEV;
2246 	}
2247 
2248 	/* Default generation to zero (all workarounds apply) */
2249 	pdata->generation = 0;
2250 
2251 	pdata->idrev = smsc911x_reg_read(pdata, ID_REV);
2252 	switch (pdata->idrev & 0xFFFF0000) {
2253 	case LAN9118:
2254 	case LAN9117:
2255 	case LAN9116:
2256 	case LAN9115:
2257 	case LAN89218:
2258 		/* LAN911[5678] family */
2259 		pdata->generation = pdata->idrev & 0x0000FFFF;
2260 		break;
2261 
2262 	case LAN9218:
2263 	case LAN9217:
2264 	case LAN9216:
2265 	case LAN9215:
2266 		/* LAN921[5678] family */
2267 		pdata->generation = 3;
2268 		break;
2269 
2270 	case LAN9210:
2271 	case LAN9211:
2272 	case LAN9220:
2273 	case LAN9221:
2274 	case LAN9250:
2275 		/* LAN9210/LAN9211/LAN9220/LAN9221/LAN9250 */
2276 		pdata->generation = 4;
2277 		break;
2278 
2279 	default:
2280 		SMSC_WARN(pdata, probe, "LAN911x not identified, idrev: 0x%08X",
2281 			  pdata->idrev);
2282 		return -ENODEV;
2283 	}
2284 
2285 	SMSC_TRACE(pdata, probe,
2286 		   "LAN911x identified, idrev: 0x%08X, generation: %d",
2287 		   pdata->idrev, pdata->generation);
2288 
2289 	if (pdata->generation == 0)
2290 		SMSC_WARN(pdata, probe,
2291 			  "This driver is not intended for this chip revision");
2292 
2293 	/* workaround for platforms without an eeprom, where the mac address
2294 	 * is stored elsewhere and set by the bootloader.  This saves the
2295 	 * mac address before resetting the device */
2296 	if (pdata->config.flags & SMSC911X_SAVE_MAC_ADDRESS) {
2297 		spin_lock_irq(&pdata->mac_lock);
2298 		smsc911x_read_mac_address(dev);
2299 		spin_unlock_irq(&pdata->mac_lock);
2300 	}
2301 
2302 	/* Reset the LAN911x */
2303 	if (smsc911x_phy_reset(pdata) || smsc911x_soft_reset(pdata))
2304 		return -ENODEV;
2305 
2306 	dev->flags |= IFF_MULTICAST;
2307 	netif_napi_add_weight(dev, &pdata->napi, smsc911x_poll,
2308 			      SMSC_NAPI_WEIGHT);
2309 	dev->netdev_ops = &smsc911x_netdev_ops;
2310 	dev->ethtool_ops = &smsc911x_ethtool_ops;
2311 
2312 	return 0;
2313 }
2314 
2315 static int smsc911x_drv_remove(struct platform_device *pdev)
2316 {
2317 	struct net_device *dev;
2318 	struct smsc911x_data *pdata;
2319 	struct resource *res;
2320 
2321 	dev = platform_get_drvdata(pdev);
2322 	BUG_ON(!dev);
2323 	pdata = netdev_priv(dev);
2324 	BUG_ON(!pdata);
2325 	BUG_ON(!pdata->ioaddr);
2326 
2327 	SMSC_TRACE(pdata, ifdown, "Stopping driver");
2328 
2329 	unregister_netdev(dev);
2330 
2331 	mdiobus_unregister(pdata->mii_bus);
2332 	mdiobus_free(pdata->mii_bus);
2333 
2334 	res = platform_get_resource_byname(pdev, IORESOURCE_MEM,
2335 					   "smsc911x-memory");
2336 	if (!res)
2337 		res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
2338 
2339 	release_mem_region(res->start, resource_size(res));
2340 
2341 	iounmap(pdata->ioaddr);
2342 
2343 	(void)smsc911x_disable_resources(pdev);
2344 	smsc911x_free_resources(pdev);
2345 
2346 	free_netdev(dev);
2347 
2348 	pm_runtime_disable(&pdev->dev);
2349 
2350 	return 0;
2351 }
2352 
2353 /* standard register acces */
2354 static const struct smsc911x_ops standard_smsc911x_ops = {
2355 	.reg_read = __smsc911x_reg_read,
2356 	.reg_write = __smsc911x_reg_write,
2357 	.rx_readfifo = smsc911x_rx_readfifo,
2358 	.tx_writefifo = smsc911x_tx_writefifo,
2359 };
2360 
2361 /* shifted register access */
2362 static const struct smsc911x_ops shifted_smsc911x_ops = {
2363 	.reg_read = __smsc911x_reg_read_shift,
2364 	.reg_write = __smsc911x_reg_write_shift,
2365 	.rx_readfifo = smsc911x_rx_readfifo_shift,
2366 	.tx_writefifo = smsc911x_tx_writefifo_shift,
2367 };
2368 
2369 static int smsc911x_probe_config(struct smsc911x_platform_config *config,
2370 				 struct device *dev)
2371 {
2372 	int phy_interface;
2373 	u32 width = 0;
2374 	int err;
2375 
2376 	phy_interface = device_get_phy_mode(dev);
2377 	if (phy_interface < 0)
2378 		phy_interface = PHY_INTERFACE_MODE_NA;
2379 	config->phy_interface = phy_interface;
2380 
2381 	device_get_mac_address(dev, config->mac);
2382 
2383 	err = device_property_read_u32(dev, "reg-io-width", &width);
2384 	if (err == -ENXIO)
2385 		return err;
2386 	if (!err && width == 4)
2387 		config->flags |= SMSC911X_USE_32BIT;
2388 	else
2389 		config->flags |= SMSC911X_USE_16BIT;
2390 
2391 	device_property_read_u32(dev, "reg-shift", &config->shift);
2392 
2393 	if (device_property_present(dev, "smsc,irq-active-high"))
2394 		config->irq_polarity = SMSC911X_IRQ_POLARITY_ACTIVE_HIGH;
2395 
2396 	if (device_property_present(dev, "smsc,irq-push-pull"))
2397 		config->irq_type = SMSC911X_IRQ_TYPE_PUSH_PULL;
2398 
2399 	if (device_property_present(dev, "smsc,force-internal-phy"))
2400 		config->flags |= SMSC911X_FORCE_INTERNAL_PHY;
2401 
2402 	if (device_property_present(dev, "smsc,force-external-phy"))
2403 		config->flags |= SMSC911X_FORCE_EXTERNAL_PHY;
2404 
2405 	if (device_property_present(dev, "smsc,save-mac-address"))
2406 		config->flags |= SMSC911X_SAVE_MAC_ADDRESS;
2407 
2408 	return 0;
2409 }
2410 
2411 static int smsc911x_drv_probe(struct platform_device *pdev)
2412 {
2413 	struct net_device *dev;
2414 	struct smsc911x_data *pdata;
2415 	struct smsc911x_platform_config *config = dev_get_platdata(&pdev->dev);
2416 	struct resource *res;
2417 	int res_size, irq;
2418 	int retval;
2419 
2420 	res = platform_get_resource_byname(pdev, IORESOURCE_MEM,
2421 					   "smsc911x-memory");
2422 	if (!res)
2423 		res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
2424 	if (!res) {
2425 		pr_warn("Could not allocate resource\n");
2426 		retval = -ENODEV;
2427 		goto out_0;
2428 	}
2429 	res_size = resource_size(res);
2430 
2431 	irq = platform_get_irq(pdev, 0);
2432 	if (irq == -EPROBE_DEFER) {
2433 		retval = -EPROBE_DEFER;
2434 		goto out_0;
2435 	} else if (irq < 0) {
2436 		pr_warn("Could not allocate irq resource\n");
2437 		retval = -ENODEV;
2438 		goto out_0;
2439 	}
2440 
2441 	if (!request_mem_region(res->start, res_size, SMSC_CHIPNAME)) {
2442 		retval = -EBUSY;
2443 		goto out_0;
2444 	}
2445 
2446 	dev = alloc_etherdev(sizeof(struct smsc911x_data));
2447 	if (!dev) {
2448 		retval = -ENOMEM;
2449 		goto out_release_io_1;
2450 	}
2451 
2452 	SET_NETDEV_DEV(dev, &pdev->dev);
2453 
2454 	pdata = netdev_priv(dev);
2455 	dev->irq = irq;
2456 	pdata->ioaddr = ioremap(res->start, res_size);
2457 	if (!pdata->ioaddr) {
2458 		retval = -ENOMEM;
2459 		goto out_ioremap_fail;
2460 	}
2461 
2462 	pdata->dev = dev;
2463 	pdata->msg_enable = ((1 << debug) - 1);
2464 
2465 	platform_set_drvdata(pdev, dev);
2466 
2467 	retval = smsc911x_request_resources(pdev);
2468 	if (retval)
2469 		goto out_request_resources_fail;
2470 
2471 	retval = smsc911x_enable_resources(pdev);
2472 	if (retval)
2473 		goto out_enable_resources_fail;
2474 
2475 	if (pdata->ioaddr == NULL) {
2476 		SMSC_WARN(pdata, probe, "Error smsc911x base address invalid");
2477 		retval = -ENOMEM;
2478 		goto out_disable_resources;
2479 	}
2480 
2481 	retval = smsc911x_probe_config(&pdata->config, &pdev->dev);
2482 	if (retval && config) {
2483 		/* copy config parameters across to pdata */
2484 		memcpy(&pdata->config, config, sizeof(pdata->config));
2485 		retval = 0;
2486 	}
2487 
2488 	if (retval) {
2489 		SMSC_WARN(pdata, probe, "Error smsc911x config not found");
2490 		goto out_disable_resources;
2491 	}
2492 
2493 	/* assume standard, non-shifted, access to HW registers */
2494 	pdata->ops = &standard_smsc911x_ops;
2495 	/* apply the right access if shifting is needed */
2496 	if (pdata->config.shift)
2497 		pdata->ops = &shifted_smsc911x_ops;
2498 
2499 	pm_runtime_enable(&pdev->dev);
2500 	pm_runtime_get_sync(&pdev->dev);
2501 
2502 	retval = smsc911x_init(dev);
2503 	if (retval < 0)
2504 		goto out_init_fail;
2505 
2506 	netif_carrier_off(dev);
2507 
2508 	retval = smsc911x_mii_init(pdev, dev);
2509 	if (retval) {
2510 		SMSC_WARN(pdata, probe, "Error %i initialising mii", retval);
2511 		goto out_init_fail;
2512 	}
2513 
2514 	retval = register_netdev(dev);
2515 	if (retval) {
2516 		SMSC_WARN(pdata, probe, "Error %i registering device", retval);
2517 		goto out_init_fail;
2518 	} else {
2519 		SMSC_TRACE(pdata, probe,
2520 			   "Network interface: \"%s\"", dev->name);
2521 	}
2522 
2523 	spin_lock_irq(&pdata->mac_lock);
2524 
2525 	/* Check if mac address has been specified when bringing interface up */
2526 	if (is_valid_ether_addr(dev->dev_addr)) {
2527 		smsc911x_set_hw_mac_address(pdata, dev->dev_addr);
2528 		SMSC_TRACE(pdata, probe,
2529 			   "MAC Address is specified by configuration");
2530 	} else if (is_valid_ether_addr(pdata->config.mac)) {
2531 		eth_hw_addr_set(dev, pdata->config.mac);
2532 		SMSC_TRACE(pdata, probe,
2533 			   "MAC Address specified by platform data");
2534 	} else {
2535 		/* Try reading mac address from device. if EEPROM is present
2536 		 * it will already have been set */
2537 		smsc_get_mac(dev);
2538 
2539 		if (is_valid_ether_addr(dev->dev_addr)) {
2540 			/* eeprom values are valid  so use them */
2541 			SMSC_TRACE(pdata, probe,
2542 				   "Mac Address is read from LAN911x EEPROM");
2543 		} else {
2544 			/* eeprom values are invalid, generate random MAC */
2545 			eth_hw_addr_random(dev);
2546 			smsc911x_set_hw_mac_address(pdata, dev->dev_addr);
2547 			SMSC_TRACE(pdata, probe,
2548 				   "MAC Address is set to eth_random_addr");
2549 		}
2550 	}
2551 
2552 	spin_unlock_irq(&pdata->mac_lock);
2553 	pm_runtime_put(&pdev->dev);
2554 
2555 	netdev_info(dev, "MAC Address: %pM\n", dev->dev_addr);
2556 
2557 	return 0;
2558 
2559 out_init_fail:
2560 	pm_runtime_put(&pdev->dev);
2561 	pm_runtime_disable(&pdev->dev);
2562 out_disable_resources:
2563 	(void)smsc911x_disable_resources(pdev);
2564 out_enable_resources_fail:
2565 	smsc911x_free_resources(pdev);
2566 out_request_resources_fail:
2567 	iounmap(pdata->ioaddr);
2568 out_ioremap_fail:
2569 	free_netdev(dev);
2570 out_release_io_1:
2571 	release_mem_region(res->start, resource_size(res));
2572 out_0:
2573 	return retval;
2574 }
2575 
2576 #ifdef CONFIG_PM
2577 /* This implementation assumes the devices remains powered on its VDDVARIO
2578  * pins during suspend. */
2579 
2580 /* TODO: implement freeze/thaw callbacks for hibernation.*/
2581 
2582 static int smsc911x_suspend(struct device *dev)
2583 {
2584 	struct net_device *ndev = dev_get_drvdata(dev);
2585 	struct smsc911x_data *pdata = netdev_priv(ndev);
2586 
2587 	if (netif_running(ndev)) {
2588 		netif_stop_queue(ndev);
2589 		netif_device_detach(ndev);
2590 	}
2591 
2592 	/* enable wake on LAN, energy detection and the external PME
2593 	 * signal. */
2594 	smsc911x_reg_write(pdata, PMT_CTRL,
2595 		PMT_CTRL_PM_MODE_D1_ | PMT_CTRL_WOL_EN_ |
2596 		PMT_CTRL_ED_EN_ | PMT_CTRL_PME_EN_);
2597 
2598 	pm_runtime_disable(dev);
2599 	pm_runtime_set_suspended(dev);
2600 
2601 	return 0;
2602 }
2603 
2604 static int smsc911x_resume(struct device *dev)
2605 {
2606 	struct net_device *ndev = dev_get_drvdata(dev);
2607 	struct smsc911x_data *pdata = netdev_priv(ndev);
2608 	unsigned int to = 100;
2609 
2610 	pm_runtime_enable(dev);
2611 	pm_runtime_resume(dev);
2612 
2613 	/* Note 3.11 from the datasheet:
2614 	 * 	"When the LAN9220 is in a power saving state, a write of any
2615 	 * 	 data to the BYTE_TEST register will wake-up the device."
2616 	 */
2617 	smsc911x_reg_write(pdata, BYTE_TEST, 0);
2618 
2619 	/* poll the READY bit in PMT_CTRL. Any other access to the device is
2620 	 * forbidden while this bit isn't set. Try for 100ms and return -EIO
2621 	 * if it failed. */
2622 	while (!(smsc911x_reg_read(pdata, PMT_CTRL) & PMT_CTRL_READY_) && --to)
2623 		udelay(1000);
2624 
2625 	if (to == 0)
2626 		return -EIO;
2627 
2628 	if (netif_running(ndev)) {
2629 		netif_device_attach(ndev);
2630 		netif_start_queue(ndev);
2631 	}
2632 
2633 	return 0;
2634 }
2635 
2636 static const struct dev_pm_ops smsc911x_pm_ops = {
2637 	.suspend	= smsc911x_suspend,
2638 	.resume		= smsc911x_resume,
2639 };
2640 
2641 #define SMSC911X_PM_OPS (&smsc911x_pm_ops)
2642 
2643 #else
2644 #define SMSC911X_PM_OPS NULL
2645 #endif
2646 
2647 #ifdef CONFIG_OF
2648 static const struct of_device_id smsc911x_dt_ids[] = {
2649 	{ .compatible = "smsc,lan9115", },
2650 	{ /* sentinel */ }
2651 };
2652 MODULE_DEVICE_TABLE(of, smsc911x_dt_ids);
2653 #endif
2654 
2655 #ifdef CONFIG_ACPI
2656 static const struct acpi_device_id smsc911x_acpi_match[] = {
2657 	{ "ARMH9118", 0 },
2658 	{ }
2659 };
2660 MODULE_DEVICE_TABLE(acpi, smsc911x_acpi_match);
2661 #endif
2662 
2663 static struct platform_driver smsc911x_driver = {
2664 	.probe = smsc911x_drv_probe,
2665 	.remove = smsc911x_drv_remove,
2666 	.driver = {
2667 		.name	= SMSC_CHIPNAME,
2668 		.pm	= SMSC911X_PM_OPS,
2669 		.of_match_table = of_match_ptr(smsc911x_dt_ids),
2670 		.acpi_match_table = ACPI_PTR(smsc911x_acpi_match),
2671 	},
2672 };
2673 
2674 /* Entry point for loading the module */
2675 static int __init smsc911x_init_module(void)
2676 {
2677 	SMSC_INITIALIZE();
2678 	return platform_driver_register(&smsc911x_driver);
2679 }
2680 
2681 /* entry point for unloading the module */
2682 static void __exit smsc911x_cleanup_module(void)
2683 {
2684 	platform_driver_unregister(&smsc911x_driver);
2685 }
2686 
2687 module_init(smsc911x_init_module);
2688 module_exit(smsc911x_cleanup_module);
2689