xref: /openbmc/u-boot/drivers/net/macb.c (revision c2cde27d)
1 /*
2  * Copyright (C) 2005-2006 Atmel Corporation
3  *
4  * SPDX-License-Identifier:	GPL-2.0+
5  */
6 #include <common.h>
7 
8 /*
9  * The u-boot networking stack is a little weird.  It seems like the
10  * networking core allocates receive buffers up front without any
11  * regard to the hardware that's supposed to actually receive those
12  * packets.
13  *
14  * The MACB receives packets into 128-byte receive buffers, so the
15  * buffers allocated by the core isn't very practical to use.  We'll
16  * allocate our own, but we need one such buffer in case a packet
17  * wraps around the DMA ring so that we have to copy it.
18  *
19  * Therefore, define CONFIG_SYS_RX_ETH_BUFFER to 1 in the board-specific
20  * configuration header.  This way, the core allocates one RX buffer
21  * and one TX buffer, each of which can hold a ethernet packet of
22  * maximum size.
23  *
24  * For some reason, the networking core unconditionally specifies a
25  * 32-byte packet "alignment" (which really should be called
26  * "padding").  MACB shouldn't need that, but we'll refrain from any
27  * core modifications here...
28  */
29 
30 #include <net.h>
31 #include <netdev.h>
32 #include <malloc.h>
33 #include <miiphy.h>
34 
35 #include <linux/mii.h>
36 #include <asm/io.h>
37 #include <asm/dma-mapping.h>
38 #include <asm/arch/clk.h>
39 #include <asm-generic/errno.h>
40 
41 #include "macb.h"
42 
43 #define CONFIG_SYS_MACB_RX_BUFFER_SIZE		4096
44 #define CONFIG_SYS_MACB_RX_RING_SIZE		(CONFIG_SYS_MACB_RX_BUFFER_SIZE / 128)
45 #define CONFIG_SYS_MACB_TX_RING_SIZE		16
46 #define CONFIG_SYS_MACB_TX_TIMEOUT		1000
47 #define CONFIG_SYS_MACB_AUTONEG_TIMEOUT	5000000
48 
49 struct macb_dma_desc {
50 	u32	addr;
51 	u32	ctrl;
52 };
53 
54 #define RXADDR_USED		0x00000001
55 #define RXADDR_WRAP		0x00000002
56 
57 #define RXBUF_FRMLEN_MASK	0x00000fff
58 #define RXBUF_FRAME_START	0x00004000
59 #define RXBUF_FRAME_END		0x00008000
60 #define RXBUF_TYPEID_MATCH	0x00400000
61 #define RXBUF_ADDR4_MATCH	0x00800000
62 #define RXBUF_ADDR3_MATCH	0x01000000
63 #define RXBUF_ADDR2_MATCH	0x02000000
64 #define RXBUF_ADDR1_MATCH	0x04000000
65 #define RXBUF_BROADCAST		0x80000000
66 
67 #define TXBUF_FRMLEN_MASK	0x000007ff
68 #define TXBUF_FRAME_END		0x00008000
69 #define TXBUF_NOCRC		0x00010000
70 #define TXBUF_EXHAUSTED		0x08000000
71 #define TXBUF_UNDERRUN		0x10000000
72 #define TXBUF_MAXRETRY		0x20000000
73 #define TXBUF_WRAP		0x40000000
74 #define TXBUF_USED		0x80000000
75 
76 struct macb_device {
77 	void			*regs;
78 
79 	unsigned int		rx_tail;
80 	unsigned int		tx_head;
81 	unsigned int		tx_tail;
82 
83 	void			*rx_buffer;
84 	void			*tx_buffer;
85 	struct macb_dma_desc	*rx_ring;
86 	struct macb_dma_desc	*tx_ring;
87 
88 	unsigned long		rx_buffer_dma;
89 	unsigned long		rx_ring_dma;
90 	unsigned long		tx_ring_dma;
91 
92 	const struct device	*dev;
93 	struct eth_device	netdev;
94 	unsigned short		phy_addr;
95 	struct mii_dev		*bus;
96 };
97 #define to_macb(_nd) container_of(_nd, struct macb_device, netdev)
98 
99 static int macb_is_gem(struct macb_device *macb)
100 {
101 	return MACB_BFEXT(IDNUM, macb_readl(macb, MID)) == 0x2;
102 }
103 
104 static void macb_mdio_write(struct macb_device *macb, u8 reg, u16 value)
105 {
106 	unsigned long netctl;
107 	unsigned long netstat;
108 	unsigned long frame;
109 
110 	netctl = macb_readl(macb, NCR);
111 	netctl |= MACB_BIT(MPE);
112 	macb_writel(macb, NCR, netctl);
113 
114 	frame = (MACB_BF(SOF, 1)
115 		 | MACB_BF(RW, 1)
116 		 | MACB_BF(PHYA, macb->phy_addr)
117 		 | MACB_BF(REGA, reg)
118 		 | MACB_BF(CODE, 2)
119 		 | MACB_BF(DATA, value));
120 	macb_writel(macb, MAN, frame);
121 
122 	do {
123 		netstat = macb_readl(macb, NSR);
124 	} while (!(netstat & MACB_BIT(IDLE)));
125 
126 	netctl = macb_readl(macb, NCR);
127 	netctl &= ~MACB_BIT(MPE);
128 	macb_writel(macb, NCR, netctl);
129 }
130 
131 static u16 macb_mdio_read(struct macb_device *macb, u8 reg)
132 {
133 	unsigned long netctl;
134 	unsigned long netstat;
135 	unsigned long frame;
136 
137 	netctl = macb_readl(macb, NCR);
138 	netctl |= MACB_BIT(MPE);
139 	macb_writel(macb, NCR, netctl);
140 
141 	frame = (MACB_BF(SOF, 1)
142 		 | MACB_BF(RW, 2)
143 		 | MACB_BF(PHYA, macb->phy_addr)
144 		 | MACB_BF(REGA, reg)
145 		 | MACB_BF(CODE, 2));
146 	macb_writel(macb, MAN, frame);
147 
148 	do {
149 		netstat = macb_readl(macb, NSR);
150 	} while (!(netstat & MACB_BIT(IDLE)));
151 
152 	frame = macb_readl(macb, MAN);
153 
154 	netctl = macb_readl(macb, NCR);
155 	netctl &= ~MACB_BIT(MPE);
156 	macb_writel(macb, NCR, netctl);
157 
158 	return MACB_BFEXT(DATA, frame);
159 }
160 
161 void __weak arch_get_mdio_control(const char *name)
162 {
163 	return;
164 }
165 
166 #if defined(CONFIG_CMD_MII) || defined(CONFIG_PHYLIB)
167 
168 int macb_miiphy_read(const char *devname, u8 phy_adr, u8 reg, u16 *value)
169 {
170 	struct eth_device *dev = eth_get_dev_by_name(devname);
171 	struct macb_device *macb = to_macb(dev);
172 
173 	if ( macb->phy_addr != phy_adr )
174 		return -1;
175 
176 	arch_get_mdio_control(devname);
177 	*value = macb_mdio_read(macb, reg);
178 
179 	return 0;
180 }
181 
182 int macb_miiphy_write(const char *devname, u8 phy_adr, u8 reg, u16 value)
183 {
184 	struct eth_device *dev = eth_get_dev_by_name(devname);
185 	struct macb_device *macb = to_macb(dev);
186 
187 	if ( macb->phy_addr != phy_adr )
188 		return -1;
189 
190 	arch_get_mdio_control(devname);
191 	macb_mdio_write(macb, reg, value);
192 
193 	return 0;
194 }
195 #endif
196 
197 
198 #if defined(CONFIG_CMD_NET)
199 
200 static int macb_send(struct eth_device *netdev, void *packet, int length)
201 {
202 	struct macb_device *macb = to_macb(netdev);
203 	unsigned long paddr, ctrl;
204 	unsigned int tx_head = macb->tx_head;
205 	int i;
206 
207 	paddr = dma_map_single(packet, length, DMA_TO_DEVICE);
208 
209 	ctrl = length & TXBUF_FRMLEN_MASK;
210 	ctrl |= TXBUF_FRAME_END;
211 	if (tx_head == (CONFIG_SYS_MACB_TX_RING_SIZE - 1)) {
212 		ctrl |= TXBUF_WRAP;
213 		macb->tx_head = 0;
214 	} else
215 		macb->tx_head++;
216 
217 	macb->tx_ring[tx_head].ctrl = ctrl;
218 	macb->tx_ring[tx_head].addr = paddr;
219 	barrier();
220 	macb_writel(macb, NCR, MACB_BIT(TE) | MACB_BIT(RE) | MACB_BIT(TSTART));
221 
222 	/*
223 	 * I guess this is necessary because the networking core may
224 	 * re-use the transmit buffer as soon as we return...
225 	 */
226 	for (i = 0; i <= CONFIG_SYS_MACB_TX_TIMEOUT; i++) {
227 		barrier();
228 		ctrl = macb->tx_ring[tx_head].ctrl;
229 		if (ctrl & TXBUF_USED)
230 			break;
231 		udelay(1);
232 	}
233 
234 	dma_unmap_single(packet, length, paddr);
235 
236 	if (i <= CONFIG_SYS_MACB_TX_TIMEOUT) {
237 		if (ctrl & TXBUF_UNDERRUN)
238 			printf("%s: TX underrun\n", netdev->name);
239 		if (ctrl & TXBUF_EXHAUSTED)
240 			printf("%s: TX buffers exhausted in mid frame\n",
241 			       netdev->name);
242 	} else {
243 		printf("%s: TX timeout\n", netdev->name);
244 	}
245 
246 	/* No one cares anyway */
247 	return 0;
248 }
249 
250 static void reclaim_rx_buffers(struct macb_device *macb,
251 			       unsigned int new_tail)
252 {
253 	unsigned int i;
254 
255 	i = macb->rx_tail;
256 	while (i > new_tail) {
257 		macb->rx_ring[i].addr &= ~RXADDR_USED;
258 		i++;
259 		if (i > CONFIG_SYS_MACB_RX_RING_SIZE)
260 			i = 0;
261 	}
262 
263 	while (i < new_tail) {
264 		macb->rx_ring[i].addr &= ~RXADDR_USED;
265 		i++;
266 	}
267 
268 	barrier();
269 	macb->rx_tail = new_tail;
270 }
271 
272 static int macb_recv(struct eth_device *netdev)
273 {
274 	struct macb_device *macb = to_macb(netdev);
275 	unsigned int rx_tail = macb->rx_tail;
276 	void *buffer;
277 	int length;
278 	int wrapped = 0;
279 	u32 status;
280 
281 	for (;;) {
282 		if (!(macb->rx_ring[rx_tail].addr & RXADDR_USED))
283 			return -1;
284 
285 		status = macb->rx_ring[rx_tail].ctrl;
286 		if (status & RXBUF_FRAME_START) {
287 			if (rx_tail != macb->rx_tail)
288 				reclaim_rx_buffers(macb, rx_tail);
289 			wrapped = 0;
290 		}
291 
292 		if (status & RXBUF_FRAME_END) {
293 			buffer = macb->rx_buffer + 128 * macb->rx_tail;
294 			length = status & RXBUF_FRMLEN_MASK;
295 			if (wrapped) {
296 				unsigned int headlen, taillen;
297 
298 				headlen = 128 * (CONFIG_SYS_MACB_RX_RING_SIZE
299 						 - macb->rx_tail);
300 				taillen = length - headlen;
301 				memcpy((void *)NetRxPackets[0],
302 				       buffer, headlen);
303 				memcpy((void *)NetRxPackets[0] + headlen,
304 				       macb->rx_buffer, taillen);
305 				buffer = (void *)NetRxPackets[0];
306 			}
307 
308 			NetReceive(buffer, length);
309 			if (++rx_tail >= CONFIG_SYS_MACB_RX_RING_SIZE)
310 				rx_tail = 0;
311 			reclaim_rx_buffers(macb, rx_tail);
312 		} else {
313 			if (++rx_tail >= CONFIG_SYS_MACB_RX_RING_SIZE) {
314 				wrapped = 1;
315 				rx_tail = 0;
316 			}
317 		}
318 		barrier();
319 	}
320 
321 	return 0;
322 }
323 
324 static void macb_phy_reset(struct macb_device *macb)
325 {
326 	struct eth_device *netdev = &macb->netdev;
327 	int i;
328 	u16 status, adv;
329 
330 	adv = ADVERTISE_CSMA | ADVERTISE_ALL;
331 	macb_mdio_write(macb, MII_ADVERTISE, adv);
332 	printf("%s: Starting autonegotiation...\n", netdev->name);
333 	macb_mdio_write(macb, MII_BMCR, (BMCR_ANENABLE
334 					 | BMCR_ANRESTART));
335 
336 	for (i = 0; i < CONFIG_SYS_MACB_AUTONEG_TIMEOUT / 100; i++) {
337 		status = macb_mdio_read(macb, MII_BMSR);
338 		if (status & BMSR_ANEGCOMPLETE)
339 			break;
340 		udelay(100);
341 	}
342 
343 	if (status & BMSR_ANEGCOMPLETE)
344 		printf("%s: Autonegotiation complete\n", netdev->name);
345 	else
346 		printf("%s: Autonegotiation timed out (status=0x%04x)\n",
347 		       netdev->name, status);
348 }
349 
350 #ifdef CONFIG_MACB_SEARCH_PHY
351 static int macb_phy_find(struct macb_device *macb)
352 {
353 	int i;
354 	u16 phy_id;
355 
356 	/* Search for PHY... */
357 	for (i = 0; i < 32; i++) {
358 		macb->phy_addr = i;
359 		phy_id = macb_mdio_read(macb, MII_PHYSID1);
360 		if (phy_id != 0xffff) {
361 			printf("%s: PHY present at %d\n", macb->netdev.name, i);
362 			return 1;
363 		}
364 	}
365 
366 	/* PHY isn't up to snuff */
367 	printf("%s: PHY not found\n", macb->netdev.name);
368 
369 	return 0;
370 }
371 #endif /* CONFIG_MACB_SEARCH_PHY */
372 
373 
374 static int macb_phy_init(struct macb_device *macb)
375 {
376 	struct eth_device *netdev = &macb->netdev;
377 #ifdef CONFIG_PHYLIB
378 	struct phy_device *phydev;
379 #endif
380 	u32 ncfgr;
381 	u16 phy_id, status, adv, lpa;
382 	int media, speed, duplex;
383 	int i;
384 
385 	arch_get_mdio_control(netdev->name);
386 #ifdef CONFIG_MACB_SEARCH_PHY
387 	/* Auto-detect phy_addr */
388 	if (!macb_phy_find(macb)) {
389 		return 0;
390 	}
391 #endif /* CONFIG_MACB_SEARCH_PHY */
392 
393 	/* Check if the PHY is up to snuff... */
394 	phy_id = macb_mdio_read(macb, MII_PHYSID1);
395 	if (phy_id == 0xffff) {
396 		printf("%s: No PHY present\n", netdev->name);
397 		return 0;
398 	}
399 
400 #ifdef CONFIG_PHYLIB
401 	/* need to consider other phy interface mode */
402 	phydev = phy_connect(macb->bus, macb->phy_addr, netdev,
403 			     PHY_INTERFACE_MODE_RGMII);
404 	if (!phydev) {
405 		printf("phy_connect failed\n");
406 		return -ENODEV;
407 	}
408 
409 	phy_config(phydev);
410 #endif
411 
412 	status = macb_mdio_read(macb, MII_BMSR);
413 	if (!(status & BMSR_LSTATUS)) {
414 		/* Try to re-negotiate if we don't have link already. */
415 		macb_phy_reset(macb);
416 
417 		for (i = 0; i < CONFIG_SYS_MACB_AUTONEG_TIMEOUT / 100; i++) {
418 			status = macb_mdio_read(macb, MII_BMSR);
419 			if (status & BMSR_LSTATUS)
420 				break;
421 			udelay(100);
422 		}
423 	}
424 
425 	if (!(status & BMSR_LSTATUS)) {
426 		printf("%s: link down (status: 0x%04x)\n",
427 		       netdev->name, status);
428 		return 0;
429 	}
430 
431 	/* First check for GMAC */
432 	if (macb_is_gem(macb)) {
433 		lpa = macb_mdio_read(macb, MII_STAT1000);
434 		if (lpa & (1 << 11)) {
435 			speed = 1000;
436 			duplex = 1;
437 		} else {
438 		       if (lpa & (1 << 10)) {
439 				speed = 1000;
440 				duplex = 1;
441 			} else {
442 				speed = 0;
443 			}
444 		}
445 
446 		if (speed == 1000) {
447 			printf("%s: link up, %dMbps %s-duplex (lpa: 0x%04x)\n",
448 			       netdev->name,
449 			       speed,
450 			       duplex ? "full" : "half",
451 			       lpa);
452 
453 			ncfgr = macb_readl(macb, NCFGR);
454 			ncfgr &= ~(GEM_BIT(GBE) | MACB_BIT(SPD) | MACB_BIT(FD));
455 			if (speed)
456 				ncfgr |= GEM_BIT(GBE);
457 			if (duplex)
458 				ncfgr |= MACB_BIT(FD);
459 			macb_writel(macb, NCFGR, ncfgr);
460 
461 			return 1;
462 		}
463 	}
464 
465 	/* fall back for EMAC checking */
466 	adv = macb_mdio_read(macb, MII_ADVERTISE);
467 	lpa = macb_mdio_read(macb, MII_LPA);
468 	media = mii_nway_result(lpa & adv);
469 	speed = (media & (ADVERTISE_100FULL | ADVERTISE_100HALF)
470 		 ? 1 : 0);
471 	duplex = (media & ADVERTISE_FULL) ? 1 : 0;
472 	printf("%s: link up, %sMbps %s-duplex (lpa: 0x%04x)\n",
473 	       netdev->name,
474 	       speed ? "100" : "10",
475 	       duplex ? "full" : "half",
476 	       lpa);
477 
478 	ncfgr = macb_readl(macb, NCFGR);
479 	ncfgr &= ~(MACB_BIT(SPD) | MACB_BIT(FD));
480 	if (speed)
481 		ncfgr |= MACB_BIT(SPD);
482 	if (duplex)
483 		ncfgr |= MACB_BIT(FD);
484 	macb_writel(macb, NCFGR, ncfgr);
485 
486 	return 1;
487 }
488 
489 static int macb_init(struct eth_device *netdev, bd_t *bd)
490 {
491 	struct macb_device *macb = to_macb(netdev);
492 	unsigned long paddr;
493 	int i;
494 
495 	/*
496 	 * macb_halt should have been called at some point before now,
497 	 * so we'll assume the controller is idle.
498 	 */
499 
500 	/* initialize DMA descriptors */
501 	paddr = macb->rx_buffer_dma;
502 	for (i = 0; i < CONFIG_SYS_MACB_RX_RING_SIZE; i++) {
503 		if (i == (CONFIG_SYS_MACB_RX_RING_SIZE - 1))
504 			paddr |= RXADDR_WRAP;
505 		macb->rx_ring[i].addr = paddr;
506 		macb->rx_ring[i].ctrl = 0;
507 		paddr += 128;
508 	}
509 	for (i = 0; i < CONFIG_SYS_MACB_TX_RING_SIZE; i++) {
510 		macb->tx_ring[i].addr = 0;
511 		if (i == (CONFIG_SYS_MACB_TX_RING_SIZE - 1))
512 			macb->tx_ring[i].ctrl = TXBUF_USED | TXBUF_WRAP;
513 		else
514 			macb->tx_ring[i].ctrl = TXBUF_USED;
515 	}
516 	macb->rx_tail = macb->tx_head = macb->tx_tail = 0;
517 
518 	macb_writel(macb, RBQP, macb->rx_ring_dma);
519 	macb_writel(macb, TBQP, macb->tx_ring_dma);
520 
521 	if (macb_is_gem(macb)) {
522 #ifdef CONFIG_RGMII
523 		gem_writel(macb, UR, GEM_BIT(RGMII));
524 #else
525 		gem_writel(macb, UR, 0);
526 #endif
527 	} else {
528 	/* choose RMII or MII mode. This depends on the board */
529 #ifdef CONFIG_RMII
530 #ifdef CONFIG_AT91FAMILY
531 	macb_writel(macb, USRIO, MACB_BIT(RMII) | MACB_BIT(CLKEN));
532 #else
533 	macb_writel(macb, USRIO, 0);
534 #endif
535 #else
536 #ifdef CONFIG_AT91FAMILY
537 	macb_writel(macb, USRIO, MACB_BIT(CLKEN));
538 #else
539 	macb_writel(macb, USRIO, MACB_BIT(MII));
540 #endif
541 #endif /* CONFIG_RMII */
542 	}
543 
544 	if (!macb_phy_init(macb))
545 		return -1;
546 
547 	/* Enable TX and RX */
548 	macb_writel(macb, NCR, MACB_BIT(TE) | MACB_BIT(RE));
549 
550 	return 0;
551 }
552 
553 static void macb_halt(struct eth_device *netdev)
554 {
555 	struct macb_device *macb = to_macb(netdev);
556 	u32 ncr, tsr;
557 
558 	/* Halt the controller and wait for any ongoing transmission to end. */
559 	ncr = macb_readl(macb, NCR);
560 	ncr |= MACB_BIT(THALT);
561 	macb_writel(macb, NCR, ncr);
562 
563 	do {
564 		tsr = macb_readl(macb, TSR);
565 	} while (tsr & MACB_BIT(TGO));
566 
567 	/* Disable TX and RX, and clear statistics */
568 	macb_writel(macb, NCR, MACB_BIT(CLRSTAT));
569 }
570 
571 static int macb_write_hwaddr(struct eth_device *dev)
572 {
573 	struct macb_device *macb = to_macb(dev);
574 	u32 hwaddr_bottom;
575 	u16 hwaddr_top;
576 
577 	/* set hardware address */
578 	hwaddr_bottom = dev->enetaddr[0] | dev->enetaddr[1] << 8 |
579 			dev->enetaddr[2] << 16 | dev->enetaddr[3] << 24;
580 	macb_writel(macb, SA1B, hwaddr_bottom);
581 	hwaddr_top = dev->enetaddr[4] | dev->enetaddr[5] << 8;
582 	macb_writel(macb, SA1T, hwaddr_top);
583 	return 0;
584 }
585 
586 static u32 macb_mdc_clk_div(int id, struct macb_device *macb)
587 {
588 	u32 config;
589 	unsigned long macb_hz = get_macb_pclk_rate(id);
590 
591 	if (macb_hz < 20000000)
592 		config = MACB_BF(CLK, MACB_CLK_DIV8);
593 	else if (macb_hz < 40000000)
594 		config = MACB_BF(CLK, MACB_CLK_DIV16);
595 	else if (macb_hz < 80000000)
596 		config = MACB_BF(CLK, MACB_CLK_DIV32);
597 	else
598 		config = MACB_BF(CLK, MACB_CLK_DIV64);
599 
600 	return config;
601 }
602 
603 static u32 gem_mdc_clk_div(int id, struct macb_device *macb)
604 {
605 	u32 config;
606 	unsigned long macb_hz = get_macb_pclk_rate(id);
607 
608 	if (macb_hz < 20000000)
609 		config = GEM_BF(CLK, GEM_CLK_DIV8);
610 	else if (macb_hz < 40000000)
611 		config = GEM_BF(CLK, GEM_CLK_DIV16);
612 	else if (macb_hz < 80000000)
613 		config = GEM_BF(CLK, GEM_CLK_DIV32);
614 	else if (macb_hz < 120000000)
615 		config = GEM_BF(CLK, GEM_CLK_DIV48);
616 	else if (macb_hz < 160000000)
617 		config = GEM_BF(CLK, GEM_CLK_DIV64);
618 	else
619 		config = GEM_BF(CLK, GEM_CLK_DIV96);
620 
621 	return config;
622 }
623 
624 /*
625  * Get the DMA bus width field of the network configuration register that we
626  * should program. We find the width from decoding the design configuration
627  * register to find the maximum supported data bus width.
628  */
629 static u32 macb_dbw(struct macb_device *macb)
630 {
631 	switch (GEM_BFEXT(DBWDEF, gem_readl(macb, DCFG1))) {
632 	case 4:
633 		return GEM_BF(DBW, GEM_DBW128);
634 	case 2:
635 		return GEM_BF(DBW, GEM_DBW64);
636 	case 1:
637 	default:
638 		return GEM_BF(DBW, GEM_DBW32);
639 	}
640 }
641 
642 int macb_eth_initialize(int id, void *regs, unsigned int phy_addr)
643 {
644 	struct macb_device *macb;
645 	struct eth_device *netdev;
646 	u32 ncfgr;
647 
648 	macb = malloc(sizeof(struct macb_device));
649 	if (!macb) {
650 		printf("Error: Failed to allocate memory for MACB%d\n", id);
651 		return -1;
652 	}
653 	memset(macb, 0, sizeof(struct macb_device));
654 
655 	netdev = &macb->netdev;
656 
657 	macb->rx_buffer = dma_alloc_coherent(CONFIG_SYS_MACB_RX_BUFFER_SIZE,
658 					     &macb->rx_buffer_dma);
659 	macb->rx_ring = dma_alloc_coherent(CONFIG_SYS_MACB_RX_RING_SIZE
660 					   * sizeof(struct macb_dma_desc),
661 					   &macb->rx_ring_dma);
662 	macb->tx_ring = dma_alloc_coherent(CONFIG_SYS_MACB_TX_RING_SIZE
663 					   * sizeof(struct macb_dma_desc),
664 					   &macb->tx_ring_dma);
665 
666 	macb->regs = regs;
667 	macb->phy_addr = phy_addr;
668 
669 	if (macb_is_gem(macb))
670 		sprintf(netdev->name, "gmac%d", id);
671 	else
672 		sprintf(netdev->name, "macb%d", id);
673 
674 	netdev->init = macb_init;
675 	netdev->halt = macb_halt;
676 	netdev->send = macb_send;
677 	netdev->recv = macb_recv;
678 	netdev->write_hwaddr = macb_write_hwaddr;
679 
680 	/*
681 	 * Do some basic initialization so that we at least can talk
682 	 * to the PHY
683 	 */
684 	if (macb_is_gem(macb)) {
685 		ncfgr = gem_mdc_clk_div(id, macb);
686 		ncfgr |= macb_dbw(macb);
687 	} else {
688 		ncfgr = macb_mdc_clk_div(id, macb);
689 	}
690 
691 	macb_writel(macb, NCFGR, ncfgr);
692 
693 	eth_register(netdev);
694 
695 #if defined(CONFIG_CMD_MII) || defined(CONFIG_PHYLIB)
696 	miiphy_register(netdev->name, macb_miiphy_read, macb_miiphy_write);
697 	macb->bus = miiphy_get_dev_by_name(netdev->name);
698 #endif
699 	return 0;
700 }
701 
702 #endif
703