1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3  * Xilinx EmacLite Linux driver for the Xilinx Ethernet MAC Lite device.
4  *
5  * This is a new flat driver which is based on the original emac_lite
6  * driver from John Williams <john.williams@xilinx.com>.
7  *
8  * 2007 - 2013 (c) Xilinx, Inc.
9  */
10 
11 #include <linux/module.h>
12 #include <linux/uaccess.h>
13 #include <linux/netdevice.h>
14 #include <linux/etherdevice.h>
15 #include <linux/skbuff.h>
16 #include <linux/ethtool.h>
17 #include <linux/io.h>
18 #include <linux/slab.h>
19 #include <linux/of_address.h>
20 #include <linux/of_device.h>
21 #include <linux/of_platform.h>
22 #include <linux/of_mdio.h>
23 #include <linux/of_net.h>
24 #include <linux/phy.h>
25 #include <linux/interrupt.h>
26 #include <linux/iopoll.h>
27 
28 #define DRIVER_NAME "xilinx_emaclite"
29 
30 /* Register offsets for the EmacLite Core */
31 #define XEL_TXBUFF_OFFSET	0x0		/* Transmit Buffer */
32 #define XEL_MDIOADDR_OFFSET	0x07E4		/* MDIO Address Register */
33 #define XEL_MDIOWR_OFFSET	0x07E8		/* MDIO Write Data Register */
34 #define XEL_MDIORD_OFFSET	0x07EC		/* MDIO Read Data Register */
35 #define XEL_MDIOCTRL_OFFSET	0x07F0		/* MDIO Control Register */
36 #define XEL_GIER_OFFSET		0x07F8		/* GIE Register */
37 #define XEL_TSR_OFFSET		0x07FC		/* Tx status */
38 #define XEL_TPLR_OFFSET		0x07F4		/* Tx packet length */
39 
40 #define XEL_RXBUFF_OFFSET	0x1000		/* Receive Buffer */
41 #define XEL_RPLR_OFFSET		0x100C		/* Rx packet length */
42 #define XEL_RSR_OFFSET		0x17FC		/* Rx status */
43 
44 #define XEL_BUFFER_OFFSET	0x0800		/* Next Tx/Rx buffer's offset */
45 
46 /* MDIO Address Register Bit Masks */
47 #define XEL_MDIOADDR_REGADR_MASK  0x0000001F	/* Register Address */
48 #define XEL_MDIOADDR_PHYADR_MASK  0x000003E0	/* PHY Address */
49 #define XEL_MDIOADDR_PHYADR_SHIFT 5
50 #define XEL_MDIOADDR_OP_MASK	  0x00000400	/* RD/WR Operation */
51 
52 /* MDIO Write Data Register Bit Masks */
53 #define XEL_MDIOWR_WRDATA_MASK	  0x0000FFFF	/* Data to be Written */
54 
55 /* MDIO Read Data Register Bit Masks */
56 #define XEL_MDIORD_RDDATA_MASK	  0x0000FFFF	/* Data to be Read */
57 
58 /* MDIO Control Register Bit Masks */
59 #define XEL_MDIOCTRL_MDIOSTS_MASK 0x00000001	/* MDIO Status Mask */
60 #define XEL_MDIOCTRL_MDIOEN_MASK  0x00000008	/* MDIO Enable */
61 
62 /* Global Interrupt Enable Register (GIER) Bit Masks */
63 #define XEL_GIER_GIE_MASK	0x80000000	/* Global Enable */
64 
65 /* Transmit Status Register (TSR) Bit Masks */
66 #define XEL_TSR_XMIT_BUSY_MASK	 0x00000001	/* Tx complete */
67 #define XEL_TSR_PROGRAM_MASK	 0x00000002	/* Program the MAC address */
68 #define XEL_TSR_XMIT_IE_MASK	 0x00000008	/* Tx interrupt enable bit */
69 #define XEL_TSR_XMIT_ACTIVE_MASK 0x80000000	/* Buffer is active, SW bit
70 						 * only. This is not documented
71 						 * in the HW spec
72 						 */
73 
74 /* Define for programming the MAC address into the EmacLite */
75 #define XEL_TSR_PROG_MAC_ADDR	(XEL_TSR_XMIT_BUSY_MASK | XEL_TSR_PROGRAM_MASK)
76 
77 /* Receive Status Register (RSR) */
78 #define XEL_RSR_RECV_DONE_MASK	0x00000001	/* Rx complete */
79 #define XEL_RSR_RECV_IE_MASK	0x00000008	/* Rx interrupt enable bit */
80 
81 /* Transmit Packet Length Register (TPLR) */
82 #define XEL_TPLR_LENGTH_MASK	0x0000FFFF	/* Tx packet length */
83 
84 /* Receive Packet Length Register (RPLR) */
85 #define XEL_RPLR_LENGTH_MASK	0x0000FFFF	/* Rx packet length */
86 
87 #define XEL_HEADER_OFFSET	12		/* Offset to length field */
88 #define XEL_HEADER_SHIFT	16		/* Shift value for length */
89 
90 /* General Ethernet Definitions */
91 #define XEL_ARP_PACKET_SIZE		28	/* Max ARP packet size */
92 #define XEL_HEADER_IP_LENGTH_OFFSET	16	/* IP Length Offset */
93 
94 
95 
96 #define TX_TIMEOUT		(60 * HZ)	/* Tx timeout is 60 seconds. */
97 #define ALIGNMENT		4
98 
99 /* BUFFER_ALIGN(adr) calculates the number of bytes to the next alignment. */
100 #define BUFFER_ALIGN(adr) ((ALIGNMENT - ((uintptr_t)adr)) % ALIGNMENT)
101 
102 #ifdef __BIG_ENDIAN
103 #define xemaclite_readl		ioread32be
104 #define xemaclite_writel	iowrite32be
105 #else
106 #define xemaclite_readl		ioread32
107 #define xemaclite_writel	iowrite32
108 #endif
109 
110 /**
111  * struct net_local - Our private per device data
112  * @ndev:		instance of the network device
113  * @tx_ping_pong:	indicates whether Tx Pong buffer is configured in HW
114  * @rx_ping_pong:	indicates whether Rx Pong buffer is configured in HW
115  * @next_tx_buf_to_use:	next Tx buffer to write to
116  * @next_rx_buf_to_use:	next Rx buffer to read from
117  * @base_addr:		base address of the Emaclite device
118  * @reset_lock:		lock used for synchronization
119  * @deferred_skb:	holds an skb (for transmission at a later time) when the
120  *			Tx buffer is not free
121  * @phy_dev:		pointer to the PHY device
122  * @phy_node:		pointer to the PHY device node
123  * @mii_bus:		pointer to the MII bus
124  * @last_link:		last link status
125  */
126 struct net_local {
127 
128 	struct net_device *ndev;
129 
130 	bool tx_ping_pong;
131 	bool rx_ping_pong;
132 	u32 next_tx_buf_to_use;
133 	u32 next_rx_buf_to_use;
134 	void __iomem *base_addr;
135 
136 	spinlock_t reset_lock;
137 	struct sk_buff *deferred_skb;
138 
139 	struct phy_device *phy_dev;
140 	struct device_node *phy_node;
141 
142 	struct mii_bus *mii_bus;
143 
144 	int last_link;
145 };
146 
147 
148 /*************************/
149 /* EmacLite driver calls */
150 /*************************/
151 
152 /**
153  * xemaclite_enable_interrupts - Enable the interrupts for the EmacLite device
154  * @drvdata:	Pointer to the Emaclite device private data
155  *
156  * This function enables the Tx and Rx interrupts for the Emaclite device along
157  * with the Global Interrupt Enable.
158  */
159 static void xemaclite_enable_interrupts(struct net_local *drvdata)
160 {
161 	u32 reg_data;
162 
163 	/* Enable the Tx interrupts for the first Buffer */
164 	reg_data = xemaclite_readl(drvdata->base_addr + XEL_TSR_OFFSET);
165 	xemaclite_writel(reg_data | XEL_TSR_XMIT_IE_MASK,
166 			 drvdata->base_addr + XEL_TSR_OFFSET);
167 
168 	/* Enable the Rx interrupts for the first buffer */
169 	xemaclite_writel(XEL_RSR_RECV_IE_MASK, drvdata->base_addr + XEL_RSR_OFFSET);
170 
171 	/* Enable the Global Interrupt Enable */
172 	xemaclite_writel(XEL_GIER_GIE_MASK, drvdata->base_addr + XEL_GIER_OFFSET);
173 }
174 
175 /**
176  * xemaclite_disable_interrupts - Disable the interrupts for the EmacLite device
177  * @drvdata:	Pointer to the Emaclite device private data
178  *
179  * This function disables the Tx and Rx interrupts for the Emaclite device,
180  * along with the Global Interrupt Enable.
181  */
182 static void xemaclite_disable_interrupts(struct net_local *drvdata)
183 {
184 	u32 reg_data;
185 
186 	/* Disable the Global Interrupt Enable */
187 	xemaclite_writel(XEL_GIER_GIE_MASK, drvdata->base_addr + XEL_GIER_OFFSET);
188 
189 	/* Disable the Tx interrupts for the first buffer */
190 	reg_data = xemaclite_readl(drvdata->base_addr + XEL_TSR_OFFSET);
191 	xemaclite_writel(reg_data & (~XEL_TSR_XMIT_IE_MASK),
192 			 drvdata->base_addr + XEL_TSR_OFFSET);
193 
194 	/* Disable the Rx interrupts for the first buffer */
195 	reg_data = xemaclite_readl(drvdata->base_addr + XEL_RSR_OFFSET);
196 	xemaclite_writel(reg_data & (~XEL_RSR_RECV_IE_MASK),
197 			 drvdata->base_addr + XEL_RSR_OFFSET);
198 }
199 
200 /**
201  * xemaclite_aligned_write - Write from 16-bit aligned to 32-bit aligned address
202  * @src_ptr:	Void pointer to the 16-bit aligned source address
203  * @dest_ptr:	Pointer to the 32-bit aligned destination address
204  * @length:	Number bytes to write from source to destination
205  *
206  * This function writes data from a 16-bit aligned buffer to a 32-bit aligned
207  * address in the EmacLite device.
208  */
209 static void xemaclite_aligned_write(const void *src_ptr, u32 *dest_ptr,
210 				    unsigned length)
211 {
212 	const u16 *from_u16_ptr;
213 	u32 align_buffer;
214 	u32 *to_u32_ptr;
215 	u16 *to_u16_ptr;
216 
217 	to_u32_ptr = dest_ptr;
218 	from_u16_ptr = src_ptr;
219 	align_buffer = 0;
220 
221 	for (; length > 3; length -= 4) {
222 		to_u16_ptr = (u16 *)&align_buffer;
223 		*to_u16_ptr++ = *from_u16_ptr++;
224 		*to_u16_ptr++ = *from_u16_ptr++;
225 
226 		/* This barrier resolves occasional issues seen around
227 		 * cases where the data is not properly flushed out
228 		 * from the processor store buffers to the destination
229 		 * memory locations.
230 		 */
231 		wmb();
232 
233 		/* Output a word */
234 		*to_u32_ptr++ = align_buffer;
235 	}
236 	if (length) {
237 		u8 *from_u8_ptr, *to_u8_ptr;
238 
239 		/* Set up to output the remaining data */
240 		align_buffer = 0;
241 		to_u8_ptr = (u8 *)&align_buffer;
242 		from_u8_ptr = (u8 *)from_u16_ptr;
243 
244 		/* Output the remaining data */
245 		for (; length > 0; length--)
246 			*to_u8_ptr++ = *from_u8_ptr++;
247 
248 		/* This barrier resolves occasional issues seen around
249 		 * cases where the data is not properly flushed out
250 		 * from the processor store buffers to the destination
251 		 * memory locations.
252 		 */
253 		wmb();
254 		*to_u32_ptr = align_buffer;
255 	}
256 }
257 
258 /**
259  * xemaclite_aligned_read - Read from 32-bit aligned to 16-bit aligned buffer
260  * @src_ptr:	Pointer to the 32-bit aligned source address
261  * @dest_ptr:	Pointer to the 16-bit aligned destination address
262  * @length:	Number bytes to read from source to destination
263  *
264  * This function reads data from a 32-bit aligned address in the EmacLite device
265  * to a 16-bit aligned buffer.
266  */
267 static void xemaclite_aligned_read(u32 *src_ptr, u8 *dest_ptr,
268 				   unsigned length)
269 {
270 	u16 *to_u16_ptr, *from_u16_ptr;
271 	u32 *from_u32_ptr;
272 	u32 align_buffer;
273 
274 	from_u32_ptr = src_ptr;
275 	to_u16_ptr = (u16 *)dest_ptr;
276 
277 	for (; length > 3; length -= 4) {
278 		/* Copy each word into the temporary buffer */
279 		align_buffer = *from_u32_ptr++;
280 		from_u16_ptr = (u16 *)&align_buffer;
281 
282 		/* Read data from source */
283 		*to_u16_ptr++ = *from_u16_ptr++;
284 		*to_u16_ptr++ = *from_u16_ptr++;
285 	}
286 
287 	if (length) {
288 		u8 *to_u8_ptr, *from_u8_ptr;
289 
290 		/* Set up to read the remaining data */
291 		to_u8_ptr = (u8 *)to_u16_ptr;
292 		align_buffer = *from_u32_ptr++;
293 		from_u8_ptr = (u8 *)&align_buffer;
294 
295 		/* Read the remaining data */
296 		for (; length > 0; length--)
297 			*to_u8_ptr = *from_u8_ptr;
298 	}
299 }
300 
301 /**
302  * xemaclite_send_data - Send an Ethernet frame
303  * @drvdata:	Pointer to the Emaclite device private data
304  * @data:	Pointer to the data to be sent
305  * @byte_count:	Total frame size, including header
306  *
307  * This function checks if the Tx buffer of the Emaclite device is free to send
308  * data. If so, it fills the Tx buffer with data for transmission. Otherwise, it
309  * returns an error.
310  *
311  * Return:	0 upon success or -1 if the buffer(s) are full.
312  *
313  * Note:	The maximum Tx packet size can not be more than Ethernet header
314  *		(14 Bytes) + Maximum MTU (1500 bytes). This is excluding FCS.
315  */
316 static int xemaclite_send_data(struct net_local *drvdata, u8 *data,
317 			       unsigned int byte_count)
318 {
319 	u32 reg_data;
320 	void __iomem *addr;
321 
322 	/* Determine the expected Tx buffer address */
323 	addr = drvdata->base_addr + drvdata->next_tx_buf_to_use;
324 
325 	/* If the length is too large, truncate it */
326 	if (byte_count > ETH_FRAME_LEN)
327 		byte_count = ETH_FRAME_LEN;
328 
329 	/* Check if the expected buffer is available */
330 	reg_data = xemaclite_readl(addr + XEL_TSR_OFFSET);
331 	if ((reg_data & (XEL_TSR_XMIT_BUSY_MASK |
332 	     XEL_TSR_XMIT_ACTIVE_MASK)) == 0) {
333 
334 		/* Switch to next buffer if configured */
335 		if (drvdata->tx_ping_pong != 0)
336 			drvdata->next_tx_buf_to_use ^= XEL_BUFFER_OFFSET;
337 	} else if (drvdata->tx_ping_pong != 0) {
338 		/* If the expected buffer is full, try the other buffer,
339 		 * if it is configured in HW
340 		 */
341 
342 		addr = (void __iomem __force *)((uintptr_t __force)addr ^
343 						 XEL_BUFFER_OFFSET);
344 		reg_data = xemaclite_readl(addr + XEL_TSR_OFFSET);
345 
346 		if ((reg_data & (XEL_TSR_XMIT_BUSY_MASK |
347 		     XEL_TSR_XMIT_ACTIVE_MASK)) != 0)
348 			return -1; /* Buffers were full, return failure */
349 	} else
350 		return -1; /* Buffer was full, return failure */
351 
352 	/* Write the frame to the buffer */
353 	xemaclite_aligned_write(data, (u32 __force *)addr, byte_count);
354 
355 	xemaclite_writel((byte_count & XEL_TPLR_LENGTH_MASK),
356 			 addr + XEL_TPLR_OFFSET);
357 
358 	/* Update the Tx Status Register to indicate that there is a
359 	 * frame to send. Set the XEL_TSR_XMIT_ACTIVE_MASK flag which
360 	 * is used by the interrupt handler to check whether a frame
361 	 * has been transmitted
362 	 */
363 	reg_data = xemaclite_readl(addr + XEL_TSR_OFFSET);
364 	reg_data |= (XEL_TSR_XMIT_BUSY_MASK | XEL_TSR_XMIT_ACTIVE_MASK);
365 	xemaclite_writel(reg_data, addr + XEL_TSR_OFFSET);
366 
367 	return 0;
368 }
369 
370 /**
371  * xemaclite_recv_data - Receive a frame
372  * @drvdata:	Pointer to the Emaclite device private data
373  * @data:	Address where the data is to be received
374  * @maxlen:    Maximum supported ethernet packet length
375  *
376  * This function is intended to be called from the interrupt context or
377  * with a wrapper which waits for the receive frame to be available.
378  *
379  * Return:	Total number of bytes received
380  */
381 static u16 xemaclite_recv_data(struct net_local *drvdata, u8 *data, int maxlen)
382 {
383 	void __iomem *addr;
384 	u16 length, proto_type;
385 	u32 reg_data;
386 
387 	/* Determine the expected buffer address */
388 	addr = (drvdata->base_addr + drvdata->next_rx_buf_to_use);
389 
390 	/* Verify which buffer has valid data */
391 	reg_data = xemaclite_readl(addr + XEL_RSR_OFFSET);
392 
393 	if ((reg_data & XEL_RSR_RECV_DONE_MASK) == XEL_RSR_RECV_DONE_MASK) {
394 		if (drvdata->rx_ping_pong != 0)
395 			drvdata->next_rx_buf_to_use ^= XEL_BUFFER_OFFSET;
396 	} else {
397 		/* The instance is out of sync, try other buffer if other
398 		 * buffer is configured, return 0 otherwise. If the instance is
399 		 * out of sync, do not update the 'next_rx_buf_to_use' since it
400 		 * will correct on subsequent calls
401 		 */
402 		if (drvdata->rx_ping_pong != 0)
403 			addr = (void __iomem __force *)
404 				((uintptr_t __force)addr ^
405 				 XEL_BUFFER_OFFSET);
406 		else
407 			return 0;	/* No data was available */
408 
409 		/* Verify that buffer has valid data */
410 		reg_data = xemaclite_readl(addr + XEL_RSR_OFFSET);
411 		if ((reg_data & XEL_RSR_RECV_DONE_MASK) !=
412 		     XEL_RSR_RECV_DONE_MASK)
413 			return 0;	/* No data was available */
414 	}
415 
416 	/* Get the protocol type of the ethernet frame that arrived
417 	 */
418 	proto_type = ((ntohl(xemaclite_readl(addr + XEL_HEADER_OFFSET +
419 			XEL_RXBUFF_OFFSET)) >> XEL_HEADER_SHIFT) &
420 			XEL_RPLR_LENGTH_MASK);
421 
422 	/* Check if received ethernet frame is a raw ethernet frame
423 	 * or an IP packet or an ARP packet
424 	 */
425 	if (proto_type > ETH_DATA_LEN) {
426 
427 		if (proto_type == ETH_P_IP) {
428 			length = ((ntohl(xemaclite_readl(addr +
429 					XEL_HEADER_IP_LENGTH_OFFSET +
430 					XEL_RXBUFF_OFFSET)) >>
431 					XEL_HEADER_SHIFT) &
432 					XEL_RPLR_LENGTH_MASK);
433 			length = min_t(u16, length, ETH_DATA_LEN);
434 			length += ETH_HLEN + ETH_FCS_LEN;
435 
436 		} else if (proto_type == ETH_P_ARP)
437 			length = XEL_ARP_PACKET_SIZE + ETH_HLEN + ETH_FCS_LEN;
438 		else
439 			/* Field contains type other than IP or ARP, use max
440 			 * frame size and let user parse it
441 			 */
442 			length = ETH_FRAME_LEN + ETH_FCS_LEN;
443 	} else
444 		/* Use the length in the frame, plus the header and trailer */
445 		length = proto_type + ETH_HLEN + ETH_FCS_LEN;
446 
447 	if (WARN_ON(length > maxlen))
448 		length = maxlen;
449 
450 	/* Read from the EmacLite device */
451 	xemaclite_aligned_read((u32 __force *)(addr + XEL_RXBUFF_OFFSET),
452 				data, length);
453 
454 	/* Acknowledge the frame */
455 	reg_data = xemaclite_readl(addr + XEL_RSR_OFFSET);
456 	reg_data &= ~XEL_RSR_RECV_DONE_MASK;
457 	xemaclite_writel(reg_data, addr + XEL_RSR_OFFSET);
458 
459 	return length;
460 }
461 
462 /**
463  * xemaclite_update_address - Update the MAC address in the device
464  * @drvdata:	Pointer to the Emaclite device private data
465  * @address_ptr:Pointer to the MAC address (MAC address is a 48-bit value)
466  *
467  * Tx must be idle and Rx should be idle for deterministic results.
468  * It is recommended that this function should be called after the
469  * initialization and before transmission of any packets from the device.
470  * The MAC address can be programmed using any of the two transmit
471  * buffers (if configured).
472  */
473 static void xemaclite_update_address(struct net_local *drvdata,
474 				     const u8 *address_ptr)
475 {
476 	void __iomem *addr;
477 	u32 reg_data;
478 
479 	/* Determine the expected Tx buffer address */
480 	addr = drvdata->base_addr + drvdata->next_tx_buf_to_use;
481 
482 	xemaclite_aligned_write(address_ptr, (u32 __force *)addr, ETH_ALEN);
483 
484 	xemaclite_writel(ETH_ALEN, addr + XEL_TPLR_OFFSET);
485 
486 	/* Update the MAC address in the EmacLite */
487 	reg_data = xemaclite_readl(addr + XEL_TSR_OFFSET);
488 	xemaclite_writel(reg_data | XEL_TSR_PROG_MAC_ADDR, addr + XEL_TSR_OFFSET);
489 
490 	/* Wait for EmacLite to finish with the MAC address update */
491 	while ((xemaclite_readl(addr + XEL_TSR_OFFSET) &
492 		XEL_TSR_PROG_MAC_ADDR) != 0)
493 		;
494 }
495 
496 /**
497  * xemaclite_set_mac_address - Set the MAC address for this device
498  * @dev:	Pointer to the network device instance
499  * @address:	Void pointer to the sockaddr structure
500  *
501  * This function copies the HW address from the sockaddr strucutre to the
502  * net_device structure and updates the address in HW.
503  *
504  * Return:	Error if the net device is busy or 0 if the addr is set
505  *		successfully
506  */
507 static int xemaclite_set_mac_address(struct net_device *dev, void *address)
508 {
509 	struct net_local *lp = netdev_priv(dev);
510 	struct sockaddr *addr = address;
511 
512 	if (netif_running(dev))
513 		return -EBUSY;
514 
515 	eth_hw_addr_set(dev, addr->sa_data);
516 	xemaclite_update_address(lp, dev->dev_addr);
517 	return 0;
518 }
519 
520 /**
521  * xemaclite_tx_timeout - Callback for Tx Timeout
522  * @dev:	Pointer to the network device
523  * @txqueue:	Unused
524  *
525  * This function is called when Tx time out occurs for Emaclite device.
526  */
527 static void xemaclite_tx_timeout(struct net_device *dev, unsigned int txqueue)
528 {
529 	struct net_local *lp = netdev_priv(dev);
530 	unsigned long flags;
531 
532 	dev_err(&lp->ndev->dev, "Exceeded transmit timeout of %lu ms\n",
533 		TX_TIMEOUT * 1000UL / HZ);
534 
535 	dev->stats.tx_errors++;
536 
537 	/* Reset the device */
538 	spin_lock_irqsave(&lp->reset_lock, flags);
539 
540 	/* Shouldn't really be necessary, but shouldn't hurt */
541 	netif_stop_queue(dev);
542 
543 	xemaclite_disable_interrupts(lp);
544 	xemaclite_enable_interrupts(lp);
545 
546 	if (lp->deferred_skb) {
547 		dev_kfree_skb(lp->deferred_skb);
548 		lp->deferred_skb = NULL;
549 		dev->stats.tx_errors++;
550 	}
551 
552 	/* To exclude tx timeout */
553 	netif_trans_update(dev); /* prevent tx timeout */
554 
555 	/* We're all ready to go. Start the queue */
556 	netif_wake_queue(dev);
557 	spin_unlock_irqrestore(&lp->reset_lock, flags);
558 }
559 
560 /**********************/
561 /* Interrupt Handlers */
562 /**********************/
563 
564 /**
565  * xemaclite_tx_handler - Interrupt handler for frames sent
566  * @dev:	Pointer to the network device
567  *
568  * This function updates the number of packets transmitted and handles the
569  * deferred skb, if there is one.
570  */
571 static void xemaclite_tx_handler(struct net_device *dev)
572 {
573 	struct net_local *lp = netdev_priv(dev);
574 
575 	dev->stats.tx_packets++;
576 
577 	if (!lp->deferred_skb)
578 		return;
579 
580 	if (xemaclite_send_data(lp, (u8 *)lp->deferred_skb->data,
581 				lp->deferred_skb->len))
582 		return;
583 
584 	dev->stats.tx_bytes += lp->deferred_skb->len;
585 	dev_consume_skb_irq(lp->deferred_skb);
586 	lp->deferred_skb = NULL;
587 	netif_trans_update(dev); /* prevent tx timeout */
588 	netif_wake_queue(dev);
589 }
590 
591 /**
592  * xemaclite_rx_handler- Interrupt handler for frames received
593  * @dev:	Pointer to the network device
594  *
595  * This function allocates memory for a socket buffer, fills it with data
596  * received and hands it over to the TCP/IP stack.
597  */
598 static void xemaclite_rx_handler(struct net_device *dev)
599 {
600 	struct net_local *lp = netdev_priv(dev);
601 	struct sk_buff *skb;
602 	unsigned int align;
603 	u32 len;
604 
605 	len = ETH_FRAME_LEN + ETH_FCS_LEN;
606 	skb = netdev_alloc_skb(dev, len + ALIGNMENT);
607 	if (!skb) {
608 		/* Couldn't get memory. */
609 		dev->stats.rx_dropped++;
610 		dev_err(&lp->ndev->dev, "Could not allocate receive buffer\n");
611 		return;
612 	}
613 
614 	/* A new skb should have the data halfword aligned, but this code is
615 	 * here just in case that isn't true. Calculate how many
616 	 * bytes we should reserve to get the data to start on a word
617 	 * boundary
618 	 */
619 	align = BUFFER_ALIGN(skb->data);
620 	if (align)
621 		skb_reserve(skb, align);
622 
623 	skb_reserve(skb, 2);
624 
625 	len = xemaclite_recv_data(lp, (u8 *)skb->data, len);
626 
627 	if (!len) {
628 		dev->stats.rx_errors++;
629 		dev_kfree_skb_irq(skb);
630 		return;
631 	}
632 
633 	skb_put(skb, len);	/* Tell the skb how much data we got */
634 
635 	skb->protocol = eth_type_trans(skb, dev);
636 	skb_checksum_none_assert(skb);
637 
638 	dev->stats.rx_packets++;
639 	dev->stats.rx_bytes += len;
640 
641 	if (!skb_defer_rx_timestamp(skb))
642 		netif_rx(skb);	/* Send the packet upstream */
643 }
644 
645 /**
646  * xemaclite_interrupt - Interrupt handler for this driver
647  * @irq:	Irq of the Emaclite device
648  * @dev_id:	Void pointer to the network device instance used as callback
649  *		reference
650  *
651  * Return:	IRQ_HANDLED
652  *
653  * This function handles the Tx and Rx interrupts of the EmacLite device.
654  */
655 static irqreturn_t xemaclite_interrupt(int irq, void *dev_id)
656 {
657 	bool tx_complete = false;
658 	struct net_device *dev = dev_id;
659 	struct net_local *lp = netdev_priv(dev);
660 	void __iomem *base_addr = lp->base_addr;
661 	u32 tx_status;
662 
663 	/* Check if there is Rx Data available */
664 	if ((xemaclite_readl(base_addr + XEL_RSR_OFFSET) &
665 			 XEL_RSR_RECV_DONE_MASK) ||
666 	    (xemaclite_readl(base_addr + XEL_BUFFER_OFFSET + XEL_RSR_OFFSET)
667 			 & XEL_RSR_RECV_DONE_MASK))
668 
669 		xemaclite_rx_handler(dev);
670 
671 	/* Check if the Transmission for the first buffer is completed */
672 	tx_status = xemaclite_readl(base_addr + XEL_TSR_OFFSET);
673 	if (((tx_status & XEL_TSR_XMIT_BUSY_MASK) == 0) &&
674 		(tx_status & XEL_TSR_XMIT_ACTIVE_MASK) != 0) {
675 
676 		tx_status &= ~XEL_TSR_XMIT_ACTIVE_MASK;
677 		xemaclite_writel(tx_status, base_addr + XEL_TSR_OFFSET);
678 
679 		tx_complete = true;
680 	}
681 
682 	/* Check if the Transmission for the second buffer is completed */
683 	tx_status = xemaclite_readl(base_addr + XEL_BUFFER_OFFSET + XEL_TSR_OFFSET);
684 	if (((tx_status & XEL_TSR_XMIT_BUSY_MASK) == 0) &&
685 		(tx_status & XEL_TSR_XMIT_ACTIVE_MASK) != 0) {
686 
687 		tx_status &= ~XEL_TSR_XMIT_ACTIVE_MASK;
688 		xemaclite_writel(tx_status, base_addr + XEL_BUFFER_OFFSET +
689 				 XEL_TSR_OFFSET);
690 
691 		tx_complete = true;
692 	}
693 
694 	/* If there was a Tx interrupt, call the Tx Handler */
695 	if (tx_complete != 0)
696 		xemaclite_tx_handler(dev);
697 
698 	return IRQ_HANDLED;
699 }
700 
701 /**********************/
702 /* MDIO Bus functions */
703 /**********************/
704 
705 /**
706  * xemaclite_mdio_wait - Wait for the MDIO to be ready to use
707  * @lp:		Pointer to the Emaclite device private data
708  *
709  * This function waits till the device is ready to accept a new MDIO
710  * request.
711  *
712  * Return:	0 for success or ETIMEDOUT for a timeout
713  */
714 
715 static int xemaclite_mdio_wait(struct net_local *lp)
716 {
717 	u32 val;
718 
719 	/* wait for the MDIO interface to not be busy or timeout
720 	 * after some time.
721 	 */
722 	return readx_poll_timeout(xemaclite_readl,
723 				  lp->base_addr + XEL_MDIOCTRL_OFFSET,
724 				  val, !(val & XEL_MDIOCTRL_MDIOSTS_MASK),
725 				  1000, 20000);
726 }
727 
728 /**
729  * xemaclite_mdio_read - Read from a given MII management register
730  * @bus:	the mii_bus struct
731  * @phy_id:	the phy address
732  * @reg:	register number to read from
733  *
734  * This function waits till the device is ready to accept a new MDIO
735  * request and then writes the phy address to the MDIO Address register
736  * and reads data from MDIO Read Data register, when its available.
737  *
738  * Return:	Value read from the MII management register
739  */
740 static int xemaclite_mdio_read(struct mii_bus *bus, int phy_id, int reg)
741 {
742 	struct net_local *lp = bus->priv;
743 	u32 ctrl_reg;
744 	u32 rc;
745 
746 	if (xemaclite_mdio_wait(lp))
747 		return -ETIMEDOUT;
748 
749 	/* Write the PHY address, register number and set the OP bit in the
750 	 * MDIO Address register. Set the Status bit in the MDIO Control
751 	 * register to start a MDIO read transaction.
752 	 */
753 	ctrl_reg = xemaclite_readl(lp->base_addr + XEL_MDIOCTRL_OFFSET);
754 	xemaclite_writel(XEL_MDIOADDR_OP_MASK |
755 			 ((phy_id << XEL_MDIOADDR_PHYADR_SHIFT) | reg),
756 			 lp->base_addr + XEL_MDIOADDR_OFFSET);
757 	xemaclite_writel(ctrl_reg | XEL_MDIOCTRL_MDIOSTS_MASK,
758 			 lp->base_addr + XEL_MDIOCTRL_OFFSET);
759 
760 	if (xemaclite_mdio_wait(lp))
761 		return -ETIMEDOUT;
762 
763 	rc = xemaclite_readl(lp->base_addr + XEL_MDIORD_OFFSET);
764 
765 	dev_dbg(&lp->ndev->dev,
766 		"%s(phy_id=%i, reg=%x) == %x\n", __func__,
767 		phy_id, reg, rc);
768 
769 	return rc;
770 }
771 
772 /**
773  * xemaclite_mdio_write - Write to a given MII management register
774  * @bus:	the mii_bus struct
775  * @phy_id:	the phy address
776  * @reg:	register number to write to
777  * @val:	value to write to the register number specified by reg
778  *
779  * This function waits till the device is ready to accept a new MDIO
780  * request and then writes the val to the MDIO Write Data register.
781  *
782  * Return:      0 upon success or a negative error upon failure
783  */
784 static int xemaclite_mdio_write(struct mii_bus *bus, int phy_id, int reg,
785 				u16 val)
786 {
787 	struct net_local *lp = bus->priv;
788 	u32 ctrl_reg;
789 
790 	dev_dbg(&lp->ndev->dev,
791 		"%s(phy_id=%i, reg=%x, val=%x)\n", __func__,
792 		phy_id, reg, val);
793 
794 	if (xemaclite_mdio_wait(lp))
795 		return -ETIMEDOUT;
796 
797 	/* Write the PHY address, register number and clear the OP bit in the
798 	 * MDIO Address register and then write the value into the MDIO Write
799 	 * Data register. Finally, set the Status bit in the MDIO Control
800 	 * register to start a MDIO write transaction.
801 	 */
802 	ctrl_reg = xemaclite_readl(lp->base_addr + XEL_MDIOCTRL_OFFSET);
803 	xemaclite_writel(~XEL_MDIOADDR_OP_MASK &
804 			 ((phy_id << XEL_MDIOADDR_PHYADR_SHIFT) | reg),
805 			 lp->base_addr + XEL_MDIOADDR_OFFSET);
806 	xemaclite_writel(val, lp->base_addr + XEL_MDIOWR_OFFSET);
807 	xemaclite_writel(ctrl_reg | XEL_MDIOCTRL_MDIOSTS_MASK,
808 			 lp->base_addr + XEL_MDIOCTRL_OFFSET);
809 
810 	return 0;
811 }
812 
813 /**
814  * xemaclite_mdio_setup - Register mii_bus for the Emaclite device
815  * @lp:		Pointer to the Emaclite device private data
816  * @dev:	Pointer to OF device structure
817  *
818  * This function enables MDIO bus in the Emaclite device and registers a
819  * mii_bus.
820  *
821  * Return:	0 upon success or a negative error upon failure
822  */
823 static int xemaclite_mdio_setup(struct net_local *lp, struct device *dev)
824 {
825 	struct mii_bus *bus;
826 	int rc;
827 	struct resource res;
828 	struct device_node *np = of_get_parent(lp->phy_node);
829 	struct device_node *npp;
830 
831 	/* Don't register the MDIO bus if the phy_node or its parent node
832 	 * can't be found.
833 	 */
834 	if (!np) {
835 		dev_err(dev, "Failed to register mdio bus.\n");
836 		return -ENODEV;
837 	}
838 	npp = of_get_parent(np);
839 
840 	of_address_to_resource(npp, 0, &res);
841 	if (lp->ndev->mem_start != res.start) {
842 		struct phy_device *phydev;
843 		phydev = of_phy_find_device(lp->phy_node);
844 		if (!phydev)
845 			dev_info(dev,
846 				 "MDIO of the phy is not registered yet\n");
847 		else
848 			put_device(&phydev->mdio.dev);
849 		return 0;
850 	}
851 
852 	/* Enable the MDIO bus by asserting the enable bit in MDIO Control
853 	 * register.
854 	 */
855 	xemaclite_writel(XEL_MDIOCTRL_MDIOEN_MASK,
856 			 lp->base_addr + XEL_MDIOCTRL_OFFSET);
857 
858 	bus = mdiobus_alloc();
859 	if (!bus) {
860 		dev_err(dev, "Failed to allocate mdiobus\n");
861 		return -ENOMEM;
862 	}
863 
864 	snprintf(bus->id, MII_BUS_ID_SIZE, "%.8llx",
865 		 (unsigned long long)res.start);
866 	bus->priv = lp;
867 	bus->name = "Xilinx Emaclite MDIO";
868 	bus->read = xemaclite_mdio_read;
869 	bus->write = xemaclite_mdio_write;
870 	bus->parent = dev;
871 
872 	rc = of_mdiobus_register(bus, np);
873 	if (rc) {
874 		dev_err(dev, "Failed to register mdio bus.\n");
875 		goto err_register;
876 	}
877 
878 	lp->mii_bus = bus;
879 
880 	return 0;
881 
882 err_register:
883 	mdiobus_free(bus);
884 	return rc;
885 }
886 
887 /**
888  * xemaclite_adjust_link - Link state callback for the Emaclite device
889  * @ndev: pointer to net_device struct
890  *
891  * There's nothing in the Emaclite device to be configured when the link
892  * state changes. We just print the status.
893  */
894 static void xemaclite_adjust_link(struct net_device *ndev)
895 {
896 	struct net_local *lp = netdev_priv(ndev);
897 	struct phy_device *phy = lp->phy_dev;
898 	int link_state;
899 
900 	/* hash together the state values to decide if something has changed */
901 	link_state = phy->speed | (phy->duplex << 1) | phy->link;
902 
903 	if (lp->last_link != link_state) {
904 		lp->last_link = link_state;
905 		phy_print_status(phy);
906 	}
907 }
908 
909 /**
910  * xemaclite_open - Open the network device
911  * @dev:	Pointer to the network device
912  *
913  * This function sets the MAC address, requests an IRQ and enables interrupts
914  * for the Emaclite device and starts the Tx queue.
915  * It also connects to the phy device, if MDIO is included in Emaclite device.
916  *
917  * Return:	0 on success. -ENODEV, if PHY cannot be connected.
918  *		Non-zero error value on failure.
919  */
920 static int xemaclite_open(struct net_device *dev)
921 {
922 	struct net_local *lp = netdev_priv(dev);
923 	int retval;
924 
925 	/* Just to be safe, stop the device first */
926 	xemaclite_disable_interrupts(lp);
927 
928 	if (lp->phy_node) {
929 		u32 bmcr;
930 
931 		lp->phy_dev = of_phy_connect(lp->ndev, lp->phy_node,
932 					     xemaclite_adjust_link, 0,
933 					     PHY_INTERFACE_MODE_MII);
934 		if (!lp->phy_dev) {
935 			dev_err(&lp->ndev->dev, "of_phy_connect() failed\n");
936 			return -ENODEV;
937 		}
938 
939 		/* EmacLite doesn't support giga-bit speeds */
940 		phy_set_max_speed(lp->phy_dev, SPEED_100);
941 
942 		/* Don't advertise 1000BASE-T Full/Half duplex speeds */
943 		phy_write(lp->phy_dev, MII_CTRL1000, 0);
944 
945 		/* Advertise only 10 and 100mbps full/half duplex speeds */
946 		phy_write(lp->phy_dev, MII_ADVERTISE, ADVERTISE_ALL |
947 			  ADVERTISE_CSMA);
948 
949 		/* Restart auto negotiation */
950 		bmcr = phy_read(lp->phy_dev, MII_BMCR);
951 		bmcr |= (BMCR_ANENABLE | BMCR_ANRESTART);
952 		phy_write(lp->phy_dev, MII_BMCR, bmcr);
953 
954 		phy_start(lp->phy_dev);
955 	}
956 
957 	/* Set the MAC address each time opened */
958 	xemaclite_update_address(lp, dev->dev_addr);
959 
960 	/* Grab the IRQ */
961 	retval = request_irq(dev->irq, xemaclite_interrupt, 0, dev->name, dev);
962 	if (retval) {
963 		dev_err(&lp->ndev->dev, "Could not allocate interrupt %d\n",
964 			dev->irq);
965 		if (lp->phy_dev)
966 			phy_disconnect(lp->phy_dev);
967 		lp->phy_dev = NULL;
968 
969 		return retval;
970 	}
971 
972 	/* Enable Interrupts */
973 	xemaclite_enable_interrupts(lp);
974 
975 	/* We're ready to go */
976 	netif_start_queue(dev);
977 
978 	return 0;
979 }
980 
981 /**
982  * xemaclite_close - Close the network device
983  * @dev:	Pointer to the network device
984  *
985  * This function stops the Tx queue, disables interrupts and frees the IRQ for
986  * the Emaclite device.
987  * It also disconnects the phy device associated with the Emaclite device.
988  *
989  * Return:	0, always.
990  */
991 static int xemaclite_close(struct net_device *dev)
992 {
993 	struct net_local *lp = netdev_priv(dev);
994 
995 	netif_stop_queue(dev);
996 	xemaclite_disable_interrupts(lp);
997 	free_irq(dev->irq, dev);
998 
999 	if (lp->phy_dev)
1000 		phy_disconnect(lp->phy_dev);
1001 	lp->phy_dev = NULL;
1002 
1003 	return 0;
1004 }
1005 
1006 /**
1007  * xemaclite_send - Transmit a frame
1008  * @orig_skb:	Pointer to the socket buffer to be transmitted
1009  * @dev:	Pointer to the network device
1010  *
1011  * This function checks if the Tx buffer of the Emaclite device is free to send
1012  * data. If so, it fills the Tx buffer with data from socket buffer data,
1013  * updates the stats and frees the socket buffer. The Tx completion is signaled
1014  * by an interrupt. If the Tx buffer isn't free, then the socket buffer is
1015  * deferred and the Tx queue is stopped so that the deferred socket buffer can
1016  * be transmitted when the Emaclite device is free to transmit data.
1017  *
1018  * Return:	NETDEV_TX_OK, always.
1019  */
1020 static netdev_tx_t
1021 xemaclite_send(struct sk_buff *orig_skb, struct net_device *dev)
1022 {
1023 	struct net_local *lp = netdev_priv(dev);
1024 	struct sk_buff *new_skb;
1025 	unsigned int len;
1026 	unsigned long flags;
1027 
1028 	len = orig_skb->len;
1029 
1030 	new_skb = orig_skb;
1031 
1032 	spin_lock_irqsave(&lp->reset_lock, flags);
1033 	if (xemaclite_send_data(lp, (u8 *)new_skb->data, len) != 0) {
1034 		/* If the Emaclite Tx buffer is busy, stop the Tx queue and
1035 		 * defer the skb for transmission during the ISR, after the
1036 		 * current transmission is complete
1037 		 */
1038 		netif_stop_queue(dev);
1039 		lp->deferred_skb = new_skb;
1040 		/* Take the time stamp now, since we can't do this in an ISR. */
1041 		skb_tx_timestamp(new_skb);
1042 		spin_unlock_irqrestore(&lp->reset_lock, flags);
1043 		return NETDEV_TX_OK;
1044 	}
1045 	spin_unlock_irqrestore(&lp->reset_lock, flags);
1046 
1047 	skb_tx_timestamp(new_skb);
1048 
1049 	dev->stats.tx_bytes += len;
1050 	dev_consume_skb_any(new_skb);
1051 
1052 	return NETDEV_TX_OK;
1053 }
1054 
1055 /**
1056  * get_bool - Get a parameter from the OF device
1057  * @ofdev:	Pointer to OF device structure
1058  * @s:		Property to be retrieved
1059  *
1060  * This function looks for a property in the device node and returns the value
1061  * of the property if its found or 0 if the property is not found.
1062  *
1063  * Return:	Value of the parameter if the parameter is found, or 0 otherwise
1064  */
1065 static bool get_bool(struct platform_device *ofdev, const char *s)
1066 {
1067 	u32 *p = (u32 *)of_get_property(ofdev->dev.of_node, s, NULL);
1068 
1069 	if (!p) {
1070 		dev_warn(&ofdev->dev, "Parameter %s not found, defaulting to false\n", s);
1071 		return false;
1072 	}
1073 
1074 	return (bool)*p;
1075 }
1076 
1077 /**
1078  * xemaclite_ethtools_get_drvinfo - Get various Axi Emac Lite driver info
1079  * @ndev:       Pointer to net_device structure
1080  * @ed:         Pointer to ethtool_drvinfo structure
1081  *
1082  * This implements ethtool command for getting the driver information.
1083  * Issue "ethtool -i ethX" under linux prompt to execute this function.
1084  */
1085 static void xemaclite_ethtools_get_drvinfo(struct net_device *ndev,
1086 					   struct ethtool_drvinfo *ed)
1087 {
1088 	strlcpy(ed->driver, DRIVER_NAME, sizeof(ed->driver));
1089 }
1090 
1091 static const struct ethtool_ops xemaclite_ethtool_ops = {
1092 	.get_drvinfo    = xemaclite_ethtools_get_drvinfo,
1093 	.get_link       = ethtool_op_get_link,
1094 	.get_link_ksettings = phy_ethtool_get_link_ksettings,
1095 	.set_link_ksettings = phy_ethtool_set_link_ksettings,
1096 };
1097 
1098 static const struct net_device_ops xemaclite_netdev_ops;
1099 
1100 /**
1101  * xemaclite_of_probe - Probe method for the Emaclite device.
1102  * @ofdev:	Pointer to OF device structure
1103  *
1104  * This function probes for the Emaclite device in the device tree.
1105  * It initializes the driver data structure and the hardware, sets the MAC
1106  * address and registers the network device.
1107  * It also registers a mii_bus for the Emaclite device, if MDIO is included
1108  * in the device.
1109  *
1110  * Return:	0, if the driver is bound to the Emaclite device, or
1111  *		a negative error if there is failure.
1112  */
1113 static int xemaclite_of_probe(struct platform_device *ofdev)
1114 {
1115 	struct resource *res;
1116 	struct net_device *ndev = NULL;
1117 	struct net_local *lp = NULL;
1118 	struct device *dev = &ofdev->dev;
1119 
1120 	int rc = 0;
1121 
1122 	dev_info(dev, "Device Tree Probing\n");
1123 
1124 	/* Create an ethernet device instance */
1125 	ndev = alloc_etherdev(sizeof(struct net_local));
1126 	if (!ndev)
1127 		return -ENOMEM;
1128 
1129 	dev_set_drvdata(dev, ndev);
1130 	SET_NETDEV_DEV(ndev, &ofdev->dev);
1131 
1132 	lp = netdev_priv(ndev);
1133 	lp->ndev = ndev;
1134 
1135 	/* Get IRQ for the device */
1136 	rc = platform_get_irq(ofdev, 0);
1137 	if (rc < 0)
1138 		goto error;
1139 
1140 	ndev->irq = rc;
1141 
1142 	res = platform_get_resource(ofdev, IORESOURCE_MEM, 0);
1143 	lp->base_addr = devm_ioremap_resource(&ofdev->dev, res);
1144 	if (IS_ERR(lp->base_addr)) {
1145 		rc = PTR_ERR(lp->base_addr);
1146 		goto error;
1147 	}
1148 
1149 	ndev->mem_start = res->start;
1150 	ndev->mem_end = res->end;
1151 
1152 	spin_lock_init(&lp->reset_lock);
1153 	lp->next_tx_buf_to_use = 0x0;
1154 	lp->next_rx_buf_to_use = 0x0;
1155 	lp->tx_ping_pong = get_bool(ofdev, "xlnx,tx-ping-pong");
1156 	lp->rx_ping_pong = get_bool(ofdev, "xlnx,rx-ping-pong");
1157 
1158 	rc = of_get_ethdev_address(ofdev->dev.of_node, ndev);
1159 	if (rc) {
1160 		dev_warn(dev, "No MAC address found, using random\n");
1161 		eth_hw_addr_random(ndev);
1162 	}
1163 
1164 	/* Clear the Tx CSR's in case this is a restart */
1165 	xemaclite_writel(0, lp->base_addr + XEL_TSR_OFFSET);
1166 	xemaclite_writel(0, lp->base_addr + XEL_BUFFER_OFFSET + XEL_TSR_OFFSET);
1167 
1168 	/* Set the MAC address in the EmacLite device */
1169 	xemaclite_update_address(lp, ndev->dev_addr);
1170 
1171 	lp->phy_node = of_parse_phandle(ofdev->dev.of_node, "phy-handle", 0);
1172 	xemaclite_mdio_setup(lp, &ofdev->dev);
1173 
1174 	dev_info(dev, "MAC address is now %pM\n", ndev->dev_addr);
1175 
1176 	ndev->netdev_ops = &xemaclite_netdev_ops;
1177 	ndev->ethtool_ops = &xemaclite_ethtool_ops;
1178 	ndev->flags &= ~IFF_MULTICAST;
1179 	ndev->watchdog_timeo = TX_TIMEOUT;
1180 
1181 	/* Finally, register the device */
1182 	rc = register_netdev(ndev);
1183 	if (rc) {
1184 		dev_err(dev,
1185 			"Cannot register network device, aborting\n");
1186 		goto error;
1187 	}
1188 
1189 	dev_info(dev,
1190 		 "Xilinx EmacLite at 0x%08lX mapped to 0x%p, irq=%d\n",
1191 		 (unsigned long __force)ndev->mem_start, lp->base_addr, ndev->irq);
1192 	return 0;
1193 
1194 error:
1195 	free_netdev(ndev);
1196 	return rc;
1197 }
1198 
1199 /**
1200  * xemaclite_of_remove - Unbind the driver from the Emaclite device.
1201  * @of_dev:	Pointer to OF device structure
1202  *
1203  * This function is called if a device is physically removed from the system or
1204  * if the driver module is being unloaded. It frees any resources allocated to
1205  * the device.
1206  *
1207  * Return:	0, always.
1208  */
1209 static int xemaclite_of_remove(struct platform_device *of_dev)
1210 {
1211 	struct net_device *ndev = platform_get_drvdata(of_dev);
1212 
1213 	struct net_local *lp = netdev_priv(ndev);
1214 
1215 	/* Un-register the mii_bus, if configured */
1216 	if (lp->mii_bus) {
1217 		mdiobus_unregister(lp->mii_bus);
1218 		mdiobus_free(lp->mii_bus);
1219 		lp->mii_bus = NULL;
1220 	}
1221 
1222 	unregister_netdev(ndev);
1223 
1224 	of_node_put(lp->phy_node);
1225 	lp->phy_node = NULL;
1226 
1227 	free_netdev(ndev);
1228 
1229 	return 0;
1230 }
1231 
1232 #ifdef CONFIG_NET_POLL_CONTROLLER
1233 static void
1234 xemaclite_poll_controller(struct net_device *ndev)
1235 {
1236 	disable_irq(ndev->irq);
1237 	xemaclite_interrupt(ndev->irq, ndev);
1238 	enable_irq(ndev->irq);
1239 }
1240 #endif
1241 
1242 /* Ioctl MII Interface */
1243 static int xemaclite_ioctl(struct net_device *dev, struct ifreq *rq, int cmd)
1244 {
1245 	if (!dev->phydev || !netif_running(dev))
1246 		return -EINVAL;
1247 
1248 	switch (cmd) {
1249 	case SIOCGMIIPHY:
1250 	case SIOCGMIIREG:
1251 	case SIOCSMIIREG:
1252 		return phy_mii_ioctl(dev->phydev, rq, cmd);
1253 	default:
1254 		return -EOPNOTSUPP;
1255 	}
1256 }
1257 
1258 static const struct net_device_ops xemaclite_netdev_ops = {
1259 	.ndo_open		= xemaclite_open,
1260 	.ndo_stop		= xemaclite_close,
1261 	.ndo_start_xmit		= xemaclite_send,
1262 	.ndo_set_mac_address	= xemaclite_set_mac_address,
1263 	.ndo_tx_timeout		= xemaclite_tx_timeout,
1264 	.ndo_eth_ioctl		= xemaclite_ioctl,
1265 #ifdef CONFIG_NET_POLL_CONTROLLER
1266 	.ndo_poll_controller = xemaclite_poll_controller,
1267 #endif
1268 };
1269 
1270 /* Match table for OF platform binding */
1271 static const struct of_device_id xemaclite_of_match[] = {
1272 	{ .compatible = "xlnx,opb-ethernetlite-1.01.a", },
1273 	{ .compatible = "xlnx,opb-ethernetlite-1.01.b", },
1274 	{ .compatible = "xlnx,xps-ethernetlite-1.00.a", },
1275 	{ .compatible = "xlnx,xps-ethernetlite-2.00.a", },
1276 	{ .compatible = "xlnx,xps-ethernetlite-2.01.a", },
1277 	{ .compatible = "xlnx,xps-ethernetlite-3.00.a", },
1278 	{ /* end of list */ },
1279 };
1280 MODULE_DEVICE_TABLE(of, xemaclite_of_match);
1281 
1282 static struct platform_driver xemaclite_of_driver = {
1283 	.driver = {
1284 		.name = DRIVER_NAME,
1285 		.of_match_table = xemaclite_of_match,
1286 	},
1287 	.probe		= xemaclite_of_probe,
1288 	.remove		= xemaclite_of_remove,
1289 };
1290 
1291 module_platform_driver(xemaclite_of_driver);
1292 
1293 MODULE_AUTHOR("Xilinx, Inc.");
1294 MODULE_DESCRIPTION("Xilinx Ethernet MAC Lite driver");
1295 MODULE_LICENSE("GPL");
1296