1 /*
2  * (C) Copyright 2007-2009 Michal Simek
3  * (C) Copyright 2003 Xilinx Inc.
4  *
5  * Michal SIMEK <monstr@monstr.eu>
6  *
7  * SPDX-License-Identifier:	GPL-2.0+
8  */
9 
10 #include <common.h>
11 #include <net.h>
12 #include <config.h>
13 #include <dm.h>
14 #include <console.h>
15 #include <malloc.h>
16 #include <asm/io.h>
17 #include <phy.h>
18 #include <miiphy.h>
19 #include <fdtdec.h>
20 #include <linux/errno.h>
21 #include <linux/kernel.h>
22 #include <asm/io.h>
23 
24 DECLARE_GLOBAL_DATA_PTR;
25 
26 #define ENET_ADDR_LENGTH	6
27 #define ETH_FCS_LEN		4 /* Octets in the FCS */
28 
29 /* Xmit complete */
30 #define XEL_TSR_XMIT_BUSY_MASK		0x00000001UL
31 /* Xmit interrupt enable bit */
32 #define XEL_TSR_XMIT_IE_MASK		0x00000008UL
33 /* Program the MAC address */
34 #define XEL_TSR_PROGRAM_MASK		0x00000002UL
35 /* define for programming the MAC address into the EMAC Lite */
36 #define XEL_TSR_PROG_MAC_ADDR	(XEL_TSR_XMIT_BUSY_MASK | XEL_TSR_PROGRAM_MASK)
37 
38 /* Transmit packet length upper byte */
39 #define XEL_TPLR_LENGTH_MASK_HI		0x0000FF00UL
40 /* Transmit packet length lower byte */
41 #define XEL_TPLR_LENGTH_MASK_LO		0x000000FFUL
42 
43 /* Recv complete */
44 #define XEL_RSR_RECV_DONE_MASK		0x00000001UL
45 /* Recv interrupt enable bit */
46 #define XEL_RSR_RECV_IE_MASK		0x00000008UL
47 
48 /* MDIO Address Register Bit Masks */
49 #define XEL_MDIOADDR_REGADR_MASK  0x0000001F	/* Register Address */
50 #define XEL_MDIOADDR_PHYADR_MASK  0x000003E0	/* PHY Address */
51 #define XEL_MDIOADDR_PHYADR_SHIFT 5
52 #define XEL_MDIOADDR_OP_MASK	  0x00000400	/* RD/WR Operation */
53 
54 /* MDIO Write Data Register Bit Masks */
55 #define XEL_MDIOWR_WRDATA_MASK	  0x0000FFFF	/* Data to be Written */
56 
57 /* MDIO Read Data Register Bit Masks */
58 #define XEL_MDIORD_RDDATA_MASK	  0x0000FFFF	/* Data to be Read */
59 
60 /* MDIO Control Register Bit Masks */
61 #define XEL_MDIOCTRL_MDIOSTS_MASK 0x00000001	/* MDIO Status Mask */
62 #define XEL_MDIOCTRL_MDIOEN_MASK  0x00000008	/* MDIO Enable */
63 
64 struct emaclite_regs {
65 	u32 tx_ping; /* 0x0 - TX Ping buffer */
66 	u32 reserved1[504];
67 	u32 mdioaddr; /* 0x7e4 - MDIO Address Register */
68 	u32 mdiowr; /* 0x7e8 - MDIO Write Data Register */
69 	u32 mdiord;/* 0x7ec - MDIO Read Data Register */
70 	u32 mdioctrl; /* 0x7f0 - MDIO Control Register */
71 	u32 tx_ping_tplr; /* 0x7f4 - Tx packet length */
72 	u32 global_interrupt; /* 0x7f8 - Global interrupt enable */
73 	u32 tx_ping_tsr; /* 0x7fc - Tx status */
74 	u32 tx_pong; /* 0x800 - TX Pong buffer */
75 	u32 reserved2[508];
76 	u32 tx_pong_tplr; /* 0xff4 - Tx packet length */
77 	u32 reserved3; /* 0xff8 */
78 	u32 tx_pong_tsr; /* 0xffc - Tx status */
79 	u32 rx_ping; /* 0x1000 - Receive Buffer */
80 	u32 reserved4[510];
81 	u32 rx_ping_rsr; /* 0x17fc - Rx status */
82 	u32 rx_pong; /* 0x1800 - Receive Buffer */
83 	u32 reserved5[510];
84 	u32 rx_pong_rsr; /* 0x1ffc - Rx status */
85 };
86 
87 struct xemaclite {
88 	bool use_rx_pong_buffer_next;	/* Next RX buffer to read from */
89 	u32 txpp;		/* TX ping pong buffer */
90 	u32 rxpp;		/* RX ping pong buffer */
91 	int phyaddr;
92 	struct emaclite_regs *regs;
93 	struct phy_device *phydev;
94 	struct mii_dev *bus;
95 };
96 
97 static uchar etherrxbuff[PKTSIZE_ALIGN]; /* Receive buffer */
98 
99 static void xemaclite_alignedread(u32 *srcptr, void *destptr, u32 bytecount)
100 {
101 	u32 i;
102 	u32 alignbuffer;
103 	u32 *to32ptr;
104 	u32 *from32ptr;
105 	u8 *to8ptr;
106 	u8 *from8ptr;
107 
108 	from32ptr = (u32 *) srcptr;
109 
110 	/* Word aligned buffer, no correction needed. */
111 	to32ptr = (u32 *) destptr;
112 	while (bytecount > 3) {
113 		*to32ptr++ = *from32ptr++;
114 		bytecount -= 4;
115 	}
116 	to8ptr = (u8 *) to32ptr;
117 
118 	alignbuffer = *from32ptr++;
119 	from8ptr = (u8 *) &alignbuffer;
120 
121 	for (i = 0; i < bytecount; i++)
122 		*to8ptr++ = *from8ptr++;
123 }
124 
125 static void xemaclite_alignedwrite(void *srcptr, u32 *destptr, u32 bytecount)
126 {
127 	u32 i;
128 	u32 alignbuffer;
129 	u32 *to32ptr = (u32 *) destptr;
130 	u32 *from32ptr;
131 	u8 *to8ptr;
132 	u8 *from8ptr;
133 
134 	from32ptr = (u32 *) srcptr;
135 	while (bytecount > 3) {
136 
137 		*to32ptr++ = *from32ptr++;
138 		bytecount -= 4;
139 	}
140 
141 	alignbuffer = 0;
142 	to8ptr = (u8 *) &alignbuffer;
143 	from8ptr = (u8 *) from32ptr;
144 
145 	for (i = 0; i < bytecount; i++)
146 		*to8ptr++ = *from8ptr++;
147 
148 	*to32ptr++ = alignbuffer;
149 }
150 
151 static int wait_for_bit(const char *func, u32 *reg, const u32 mask,
152 			bool set, unsigned int timeout)
153 {
154 	u32 val;
155 	unsigned long start = get_timer(0);
156 
157 	while (1) {
158 		val = __raw_readl(reg);
159 
160 		if (!set)
161 			val = ~val;
162 
163 		if ((val & mask) == mask)
164 			return 0;
165 
166 		if (get_timer(start) > timeout)
167 			break;
168 
169 		if (ctrlc()) {
170 			puts("Abort\n");
171 			return -EINTR;
172 		}
173 
174 		udelay(1);
175 	}
176 
177 	debug("%s: Timeout (reg=%p mask=%08x wait_set=%i)\n",
178 	      func, reg, mask, set);
179 
180 	return -ETIMEDOUT;
181 }
182 
183 static int mdio_wait(struct emaclite_regs *regs)
184 {
185 	return wait_for_bit(__func__, &regs->mdioctrl,
186 			    XEL_MDIOCTRL_MDIOSTS_MASK, false, 2000);
187 }
188 
189 static u32 phyread(struct xemaclite *emaclite, u32 phyaddress, u32 registernum,
190 		   u16 *data)
191 {
192 	struct emaclite_regs *regs = emaclite->regs;
193 
194 	if (mdio_wait(regs))
195 		return 1;
196 
197 	u32 ctrl_reg = __raw_readl(&regs->mdioctrl);
198 	__raw_writel(XEL_MDIOADDR_OP_MASK
199 		| ((phyaddress << XEL_MDIOADDR_PHYADR_SHIFT)
200 		| registernum), &regs->mdioaddr);
201 	__raw_writel(ctrl_reg | XEL_MDIOCTRL_MDIOSTS_MASK, &regs->mdioctrl);
202 
203 	if (mdio_wait(regs))
204 		return 1;
205 
206 	/* Read data */
207 	*data = __raw_readl(&regs->mdiord);
208 	return 0;
209 }
210 
211 static u32 phywrite(struct xemaclite *emaclite, u32 phyaddress, u32 registernum,
212 		    u16 data)
213 {
214 	struct emaclite_regs *regs = emaclite->regs;
215 
216 	if (mdio_wait(regs))
217 		return 1;
218 
219 	/*
220 	 * Write the PHY address, register number and clear the OP bit in the
221 	 * MDIO Address register and then write the value into the MDIO Write
222 	 * Data register. Finally, set the Status bit in the MDIO Control
223 	 * register to start a MDIO write transaction.
224 	 */
225 	u32 ctrl_reg = __raw_readl(&regs->mdioctrl);
226 	__raw_writel(~XEL_MDIOADDR_OP_MASK
227 		& ((phyaddress << XEL_MDIOADDR_PHYADR_SHIFT)
228 		| registernum), &regs->mdioaddr);
229 	__raw_writel(data, &regs->mdiowr);
230 	__raw_writel(ctrl_reg | XEL_MDIOCTRL_MDIOSTS_MASK, &regs->mdioctrl);
231 
232 	if (mdio_wait(regs))
233 		return 1;
234 
235 	return 0;
236 }
237 
238 static void emaclite_stop(struct udevice *dev)
239 {
240 	debug("eth_stop\n");
241 }
242 
243 /* Use MII register 1 (MII status register) to detect PHY */
244 #define PHY_DETECT_REG  1
245 
246 /* Mask used to verify certain PHY features (or register contents)
247  * in the register above:
248  *  0x1000: 10Mbps full duplex support
249  *  0x0800: 10Mbps half duplex support
250  *  0x0008: Auto-negotiation support
251  */
252 #define PHY_DETECT_MASK 0x1808
253 
254 static int setup_phy(struct udevice *dev)
255 {
256 	int i, ret;
257 	u16 phyreg;
258 	struct xemaclite *emaclite = dev_get_priv(dev);
259 	struct phy_device *phydev;
260 
261 	u32 supported = SUPPORTED_10baseT_Half |
262 			SUPPORTED_10baseT_Full |
263 			SUPPORTED_100baseT_Half |
264 			SUPPORTED_100baseT_Full;
265 
266 	if (emaclite->phyaddr != -1) {
267 		phyread(emaclite, emaclite->phyaddr, PHY_DETECT_REG, &phyreg);
268 		if ((phyreg != 0xFFFF) &&
269 		    ((phyreg & PHY_DETECT_MASK) == PHY_DETECT_MASK)) {
270 			/* Found a valid PHY address */
271 			debug("Default phy address %d is valid\n",
272 			      emaclite->phyaddr);
273 		} else {
274 			debug("PHY address is not setup correctly %d\n",
275 			      emaclite->phyaddr);
276 			emaclite->phyaddr = -1;
277 		}
278 	}
279 
280 	if (emaclite->phyaddr == -1) {
281 		/* detect the PHY address */
282 		for (i = 31; i >= 0; i--) {
283 			phyread(emaclite, i, PHY_DETECT_REG, &phyreg);
284 			if ((phyreg != 0xFFFF) &&
285 			    ((phyreg & PHY_DETECT_MASK) == PHY_DETECT_MASK)) {
286 				/* Found a valid PHY address */
287 				emaclite->phyaddr = i;
288 				debug("emaclite: Found valid phy address, %d\n",
289 				      i);
290 				break;
291 			}
292 		}
293 	}
294 
295 	/* interface - look at tsec */
296 	phydev = phy_connect(emaclite->bus, emaclite->phyaddr, dev,
297 			     PHY_INTERFACE_MODE_MII);
298 	/*
299 	 * Phy can support 1000baseT but device NOT that's why phydev->supported
300 	 * must be setup for 1000baseT. phydev->advertising setups what speeds
301 	 * will be used for autonegotiation where 1000baseT must be disabled.
302 	 */
303 	phydev->supported = supported | SUPPORTED_1000baseT_Half |
304 						SUPPORTED_1000baseT_Full;
305 	phydev->advertising = supported;
306 	emaclite->phydev = phydev;
307 	phy_config(phydev);
308 	ret = phy_startup(phydev);
309 	if (ret)
310 		return ret;
311 
312 	if (!phydev->link) {
313 		printf("%s: No link.\n", phydev->dev->name);
314 		return 0;
315 	}
316 
317 	/* Do not setup anything */
318 	return 1;
319 }
320 
321 static int emaclite_start(struct udevice *dev)
322 {
323 	struct xemaclite *emaclite = dev_get_priv(dev);
324 	struct eth_pdata *pdata = dev_get_platdata(dev);
325 	struct emaclite_regs *regs = emaclite->regs;
326 
327 	debug("EmacLite Initialization Started\n");
328 
329 /*
330  * TX - TX_PING & TX_PONG initialization
331  */
332 	/* Restart PING TX */
333 	__raw_writel(0, &regs->tx_ping_tsr);
334 	/* Copy MAC address */
335 	xemaclite_alignedwrite(pdata->enetaddr, &regs->tx_ping,
336 			       ENET_ADDR_LENGTH);
337 	/* Set the length */
338 	__raw_writel(ENET_ADDR_LENGTH, &regs->tx_ping_tplr);
339 	/* Update the MAC address in the EMAC Lite */
340 	__raw_writel(XEL_TSR_PROG_MAC_ADDR, &regs->tx_ping_tsr);
341 	/* Wait for EMAC Lite to finish with the MAC address update */
342 	while ((__raw_readl(&regs->tx_ping_tsr) &
343 		XEL_TSR_PROG_MAC_ADDR) != 0)
344 		;
345 
346 	if (emaclite->txpp) {
347 		/* The same operation with PONG TX */
348 		__raw_writel(0, &regs->tx_pong_tsr);
349 		xemaclite_alignedwrite(pdata->enetaddr, &regs->tx_pong,
350 				       ENET_ADDR_LENGTH);
351 		__raw_writel(ENET_ADDR_LENGTH, &regs->tx_pong_tplr);
352 		__raw_writel(XEL_TSR_PROG_MAC_ADDR, &regs->tx_pong_tsr);
353 		while ((__raw_readl(&regs->tx_pong_tsr) &
354 		       XEL_TSR_PROG_MAC_ADDR) != 0)
355 			;
356 	}
357 
358 /*
359  * RX - RX_PING & RX_PONG initialization
360  */
361 	/* Write out the value to flush the RX buffer */
362 	__raw_writel(XEL_RSR_RECV_IE_MASK, &regs->rx_ping_rsr);
363 
364 	if (emaclite->rxpp)
365 		__raw_writel(XEL_RSR_RECV_IE_MASK, &regs->rx_pong_rsr);
366 
367 	__raw_writel(XEL_MDIOCTRL_MDIOEN_MASK, &regs->mdioctrl);
368 	if (__raw_readl(&regs->mdioctrl) & XEL_MDIOCTRL_MDIOEN_MASK)
369 		if (!setup_phy(dev))
370 			return -1;
371 
372 	debug("EmacLite Initialization complete\n");
373 	return 0;
374 }
375 
376 static int xemaclite_txbufferavailable(struct xemaclite *emaclite)
377 {
378 	u32 tmp;
379 	struct emaclite_regs *regs = emaclite->regs;
380 
381 	/*
382 	 * Read the other buffer register
383 	 * and determine if the other buffer is available
384 	 */
385 	tmp = ~__raw_readl(&regs->tx_ping_tsr);
386 	if (emaclite->txpp)
387 		tmp |= ~__raw_readl(&regs->tx_pong_tsr);
388 
389 	return !(tmp & XEL_TSR_XMIT_BUSY_MASK);
390 }
391 
392 static int emaclite_send(struct udevice *dev, void *ptr, int len)
393 {
394 	u32 reg;
395 	struct xemaclite *emaclite = dev_get_priv(dev);
396 	struct emaclite_regs *regs = emaclite->regs;
397 
398 	u32 maxtry = 1000;
399 
400 	if (len > PKTSIZE)
401 		len = PKTSIZE;
402 
403 	while (xemaclite_txbufferavailable(emaclite) && maxtry) {
404 		udelay(10);
405 		maxtry--;
406 	}
407 
408 	if (!maxtry) {
409 		printf("Error: Timeout waiting for ethernet TX buffer\n");
410 		/* Restart PING TX */
411 		__raw_writel(0, &regs->tx_ping_tsr);
412 		if (emaclite->txpp) {
413 			__raw_writel(0, &regs->tx_pong_tsr);
414 		}
415 		return -1;
416 	}
417 
418 	/* Determine if the expected buffer address is empty */
419 	reg = __raw_readl(&regs->tx_ping_tsr);
420 	if ((reg & XEL_TSR_XMIT_BUSY_MASK) == 0) {
421 		debug("Send packet from tx_ping buffer\n");
422 		/* Write the frame to the buffer */
423 		xemaclite_alignedwrite(ptr, &regs->tx_ping, len);
424 		__raw_writel(len
425 			& (XEL_TPLR_LENGTH_MASK_HI | XEL_TPLR_LENGTH_MASK_LO),
426 		       &regs->tx_ping_tplr);
427 		reg = __raw_readl(&regs->tx_ping_tsr);
428 		reg |= XEL_TSR_XMIT_BUSY_MASK;
429 		__raw_writel(reg, &regs->tx_ping_tsr);
430 		return 0;
431 	}
432 
433 	if (emaclite->txpp) {
434 		/* Determine if the expected buffer address is empty */
435 		reg = __raw_readl(&regs->tx_pong_tsr);
436 		if ((reg & XEL_TSR_XMIT_BUSY_MASK) == 0) {
437 			debug("Send packet from tx_pong buffer\n");
438 			/* Write the frame to the buffer */
439 			xemaclite_alignedwrite(ptr, &regs->tx_pong, len);
440 			__raw_writel(len &
441 				 (XEL_TPLR_LENGTH_MASK_HI |
442 				  XEL_TPLR_LENGTH_MASK_LO),
443 				  &regs->tx_pong_tplr);
444 			reg = __raw_readl(&regs->tx_pong_tsr);
445 			reg |= XEL_TSR_XMIT_BUSY_MASK;
446 			__raw_writel(reg, &regs->tx_pong_tsr);
447 			return 0;
448 		}
449 	}
450 
451 	puts("Error while sending frame\n");
452 	return -1;
453 }
454 
455 static int emaclite_recv(struct udevice *dev, int flags, uchar **packetp)
456 {
457 	u32 length, first_read, reg, attempt = 0;
458 	void *addr, *ack;
459 	struct xemaclite *emaclite = dev->priv;
460 	struct emaclite_regs *regs = emaclite->regs;
461 	struct ethernet_hdr *eth;
462 	struct ip_udp_hdr *ip;
463 
464 try_again:
465 	if (!emaclite->use_rx_pong_buffer_next) {
466 		reg = __raw_readl(&regs->rx_ping_rsr);
467 		debug("Testing data at rx_ping\n");
468 		if ((reg & XEL_RSR_RECV_DONE_MASK) == XEL_RSR_RECV_DONE_MASK) {
469 			debug("Data found in rx_ping buffer\n");
470 			addr = &regs->rx_ping;
471 			ack = &regs->rx_ping_rsr;
472 		} else {
473 			debug("Data not found in rx_ping buffer\n");
474 			/* Pong buffer is not available - return immediately */
475 			if (!emaclite->rxpp)
476 				return -1;
477 
478 			/* Try pong buffer if this is first attempt */
479 			if (attempt++)
480 				return -1;
481 			emaclite->use_rx_pong_buffer_next =
482 					!emaclite->use_rx_pong_buffer_next;
483 			goto try_again;
484 		}
485 	} else {
486 		reg = __raw_readl(&regs->rx_pong_rsr);
487 		debug("Testing data at rx_pong\n");
488 		if ((reg & XEL_RSR_RECV_DONE_MASK) == XEL_RSR_RECV_DONE_MASK) {
489 			debug("Data found in rx_pong buffer\n");
490 			addr = &regs->rx_pong;
491 			ack = &regs->rx_pong_rsr;
492 		} else {
493 			debug("Data not found in rx_pong buffer\n");
494 			/* Try ping buffer if this is first attempt */
495 			if (attempt++)
496 				return -1;
497 			emaclite->use_rx_pong_buffer_next =
498 					!emaclite->use_rx_pong_buffer_next;
499 			goto try_again;
500 		}
501 	}
502 
503 	/* Read all bytes for ARP packet with 32bit alignment - 48bytes  */
504 	first_read = ALIGN(ETHER_HDR_SIZE + ARP_HDR_SIZE + ETH_FCS_LEN, 4);
505 	xemaclite_alignedread(addr, etherrxbuff, first_read);
506 
507 	/* Detect real packet size */
508 	eth = (struct ethernet_hdr *)etherrxbuff;
509 	switch (ntohs(eth->et_protlen)) {
510 	case PROT_ARP:
511 		length = first_read;
512 		debug("ARP Packet %x\n", length);
513 		break;
514 	case PROT_IP:
515 		ip = (struct ip_udp_hdr *)(etherrxbuff + ETHER_HDR_SIZE);
516 		length = ntohs(ip->ip_len);
517 		length += ETHER_HDR_SIZE + ETH_FCS_LEN;
518 		debug("IP Packet %x\n", length);
519 		break;
520 	default:
521 		debug("Other Packet\n");
522 		length = PKTSIZE;
523 		break;
524 	}
525 
526 	/* Read the rest of the packet which is longer then first read */
527 	if (length != first_read)
528 		xemaclite_alignedread(addr + first_read,
529 				      etherrxbuff + first_read,
530 				      length - first_read);
531 
532 	/* Acknowledge the frame */
533 	reg = __raw_readl(ack);
534 	reg &= ~XEL_RSR_RECV_DONE_MASK;
535 	__raw_writel(reg, ack);
536 
537 	debug("Packet receive from 0x%p, length %dB\n", addr, length);
538 	*packetp = etherrxbuff;
539 	return length;
540 }
541 
542 static int emaclite_miiphy_read(struct mii_dev *bus, int addr,
543 				int devad, int reg)
544 {
545 	u32 ret;
546 	u16 val = 0;
547 
548 	ret = phyread(bus->priv, addr, reg, &val);
549 	debug("emaclite: Read MII 0x%x, 0x%x, 0x%x, %d\n", addr, reg, val, ret);
550 	return val;
551 }
552 
553 static int emaclite_miiphy_write(struct mii_dev *bus, int addr, int devad,
554 				 int reg, u16 value)
555 {
556 	debug("emaclite: Write MII 0x%x, 0x%x, 0x%x\n", addr, reg, value);
557 	return phywrite(bus->priv, addr, reg, value);
558 }
559 
560 static int emaclite_probe(struct udevice *dev)
561 {
562 	struct xemaclite *emaclite = dev_get_priv(dev);
563 	int ret;
564 
565 	emaclite->bus = mdio_alloc();
566 	emaclite->bus->read = emaclite_miiphy_read;
567 	emaclite->bus->write = emaclite_miiphy_write;
568 	emaclite->bus->priv = emaclite;
569 	strcpy(emaclite->bus->name, "emaclite");
570 
571 	ret = mdio_register(emaclite->bus);
572 	if (ret)
573 		return ret;
574 
575 	return 0;
576 }
577 
578 static int emaclite_remove(struct udevice *dev)
579 {
580 	struct xemaclite *emaclite = dev_get_priv(dev);
581 
582 	free(emaclite->phydev);
583 	mdio_unregister(emaclite->bus);
584 	mdio_free(emaclite->bus);
585 
586 	return 0;
587 }
588 
589 static const struct eth_ops emaclite_ops = {
590 	.start = emaclite_start,
591 	.send = emaclite_send,
592 	.recv = emaclite_recv,
593 	.stop = emaclite_stop,
594 };
595 
596 static int emaclite_ofdata_to_platdata(struct udevice *dev)
597 {
598 	struct eth_pdata *pdata = dev_get_platdata(dev);
599 	struct xemaclite *emaclite = dev_get_priv(dev);
600 	int offset = 0;
601 
602 	pdata->iobase = (phys_addr_t)dev_get_addr(dev);
603 	emaclite->regs = (struct emaclite_regs *)ioremap_nocache(pdata->iobase,
604 								 0x10000);
605 
606 	emaclite->phyaddr = -1;
607 
608 	offset = fdtdec_lookup_phandle(gd->fdt_blob, dev->of_offset,
609 				      "phy-handle");
610 	if (offset > 0)
611 		emaclite->phyaddr = fdtdec_get_int(gd->fdt_blob, offset,
612 						   "reg", -1);
613 
614 	emaclite->txpp = fdtdec_get_int(gd->fdt_blob, dev->of_offset,
615 					"xlnx,tx-ping-pong", 0);
616 	emaclite->rxpp = fdtdec_get_int(gd->fdt_blob, dev->of_offset,
617 					"xlnx,rx-ping-pong", 0);
618 
619 	printf("EMACLITE: %lx, phyaddr %d, %d/%d\n", (ulong)emaclite->regs,
620 	       emaclite->phyaddr, emaclite->txpp, emaclite->rxpp);
621 
622 	return 0;
623 }
624 
625 static const struct udevice_id emaclite_ids[] = {
626 	{ .compatible = "xlnx,xps-ethernetlite-1.00.a" },
627 	{ }
628 };
629 
630 U_BOOT_DRIVER(emaclite) = {
631 	.name   = "emaclite",
632 	.id     = UCLASS_ETH,
633 	.of_match = emaclite_ids,
634 	.ofdata_to_platdata = emaclite_ofdata_to_platdata,
635 	.probe  = emaclite_probe,
636 	.remove = emaclite_remove,
637 	.ops    = &emaclite_ops,
638 	.priv_auto_alloc_size = sizeof(struct xemaclite),
639 	.platdata_auto_alloc_size = sizeof(struct eth_pdata),
640 };
641