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Linux/drivers/net/ethernet/ethoc.c

  1 /*
  2  * linux/drivers/net/ethernet/ethoc.c
  3  *
  4  * Copyright (C) 2007-2008 Avionic Design Development GmbH
  5  * Copyright (C) 2008-2009 Avionic Design GmbH
  6  *
  7  * This program is free software; you can redistribute it and/or modify
  8  * it under the terms of the GNU General Public License version 2 as
  9  * published by the Free Software Foundation.
 10  *
 11  * Written by Thierry Reding <thierry.reding@avionic-design.de>
 12  */
 13 
 14 #include <linux/dma-mapping.h>
 15 #include <linux/etherdevice.h>
 16 #include <linux/clk.h>
 17 #include <linux/crc32.h>
 18 #include <linux/interrupt.h>
 19 #include <linux/io.h>
 20 #include <linux/mii.h>
 21 #include <linux/phy.h>
 22 #include <linux/platform_device.h>
 23 #include <linux/sched.h>
 24 #include <linux/slab.h>
 25 #include <linux/of.h>
 26 #include <linux/module.h>
 27 #include <net/ethoc.h>
 28 
 29 static int buffer_size = 0x8000; /* 32 KBytes */
 30 module_param(buffer_size, int, 0);
 31 MODULE_PARM_DESC(buffer_size, "DMA buffer allocation size");
 32 
 33 /* register offsets */
 34 #define MODER           0x00
 35 #define INT_SOURCE      0x04
 36 #define INT_MASK        0x08
 37 #define IPGT            0x0c
 38 #define IPGR1           0x10
 39 #define IPGR2           0x14
 40 #define PACKETLEN       0x18
 41 #define COLLCONF        0x1c
 42 #define TX_BD_NUM       0x20
 43 #define CTRLMODER       0x24
 44 #define MIIMODER        0x28
 45 #define MIICOMMAND      0x2c
 46 #define MIIADDRESS      0x30
 47 #define MIITX_DATA      0x34
 48 #define MIIRX_DATA      0x38
 49 #define MIISTATUS       0x3c
 50 #define MAC_ADDR0       0x40
 51 #define MAC_ADDR1       0x44
 52 #define ETH_HASH0       0x48
 53 #define ETH_HASH1       0x4c
 54 #define ETH_TXCTRL      0x50
 55 #define ETH_END         0x54
 56 
 57 /* mode register */
 58 #define MODER_RXEN      (1 <<  0) /* receive enable */
 59 #define MODER_TXEN      (1 <<  1) /* transmit enable */
 60 #define MODER_NOPRE     (1 <<  2) /* no preamble */
 61 #define MODER_BRO       (1 <<  3) /* broadcast address */
 62 #define MODER_IAM       (1 <<  4) /* individual address mode */
 63 #define MODER_PRO       (1 <<  5) /* promiscuous mode */
 64 #define MODER_IFG       (1 <<  6) /* interframe gap for incoming frames */
 65 #define MODER_LOOP      (1 <<  7) /* loopback */
 66 #define MODER_NBO       (1 <<  8) /* no back-off */
 67 #define MODER_EDE       (1 <<  9) /* excess defer enable */
 68 #define MODER_FULLD     (1 << 10) /* full duplex */
 69 #define MODER_RESET     (1 << 11) /* FIXME: reset (undocumented) */
 70 #define MODER_DCRC      (1 << 12) /* delayed CRC enable */
 71 #define MODER_CRC       (1 << 13) /* CRC enable */
 72 #define MODER_HUGE      (1 << 14) /* huge packets enable */
 73 #define MODER_PAD       (1 << 15) /* padding enabled */
 74 #define MODER_RSM       (1 << 16) /* receive small packets */
 75 
 76 /* interrupt source and mask registers */
 77 #define INT_MASK_TXF    (1 << 0) /* transmit frame */
 78 #define INT_MASK_TXE    (1 << 1) /* transmit error */
 79 #define INT_MASK_RXF    (1 << 2) /* receive frame */
 80 #define INT_MASK_RXE    (1 << 3) /* receive error */
 81 #define INT_MASK_BUSY   (1 << 4)
 82 #define INT_MASK_TXC    (1 << 5) /* transmit control frame */
 83 #define INT_MASK_RXC    (1 << 6) /* receive control frame */
 84 
 85 #define INT_MASK_TX     (INT_MASK_TXF | INT_MASK_TXE)
 86 #define INT_MASK_RX     (INT_MASK_RXF | INT_MASK_RXE)
 87 
 88 #define INT_MASK_ALL ( \
 89                 INT_MASK_TXF | INT_MASK_TXE | \
 90                 INT_MASK_RXF | INT_MASK_RXE | \
 91                 INT_MASK_TXC | INT_MASK_RXC | \
 92                 INT_MASK_BUSY \
 93         )
 94 
 95 /* packet length register */
 96 #define PACKETLEN_MIN(min)              (((min) & 0xffff) << 16)
 97 #define PACKETLEN_MAX(max)              (((max) & 0xffff) <<  0)
 98 #define PACKETLEN_MIN_MAX(min, max)     (PACKETLEN_MIN(min) | \
 99                                         PACKETLEN_MAX(max))
100 
101 /* transmit buffer number register */
102 #define TX_BD_NUM_VAL(x)        (((x) <= 0x80) ? (x) : 0x80)
103 
104 /* control module mode register */
105 #define CTRLMODER_PASSALL       (1 << 0) /* pass all receive frames */
106 #define CTRLMODER_RXFLOW        (1 << 1) /* receive control flow */
107 #define CTRLMODER_TXFLOW        (1 << 2) /* transmit control flow */
108 
109 /* MII mode register */
110 #define MIIMODER_CLKDIV(x)      ((x) & 0xfe) /* needs to be an even number */
111 #define MIIMODER_NOPRE          (1 << 8) /* no preamble */
112 
113 /* MII command register */
114 #define MIICOMMAND_SCAN         (1 << 0) /* scan status */
115 #define MIICOMMAND_READ         (1 << 1) /* read status */
116 #define MIICOMMAND_WRITE        (1 << 2) /* write control data */
117 
118 /* MII address register */
119 #define MIIADDRESS_FIAD(x)              (((x) & 0x1f) << 0)
120 #define MIIADDRESS_RGAD(x)              (((x) & 0x1f) << 8)
121 #define MIIADDRESS_ADDR(phy, reg)       (MIIADDRESS_FIAD(phy) | \
122                                         MIIADDRESS_RGAD(reg))
123 
124 /* MII transmit data register */
125 #define MIITX_DATA_VAL(x)       ((x) & 0xffff)
126 
127 /* MII receive data register */
128 #define MIIRX_DATA_VAL(x)       ((x) & 0xffff)
129 
130 /* MII status register */
131 #define MIISTATUS_LINKFAIL      (1 << 0)
132 #define MIISTATUS_BUSY          (1 << 1)
133 #define MIISTATUS_INVALID       (1 << 2)
134 
135 /* TX buffer descriptor */
136 #define TX_BD_CS                (1 <<  0) /* carrier sense lost */
137 #define TX_BD_DF                (1 <<  1) /* defer indication */
138 #define TX_BD_LC                (1 <<  2) /* late collision */
139 #define TX_BD_RL                (1 <<  3) /* retransmission limit */
140 #define TX_BD_RETRY_MASK        (0x00f0)
141 #define TX_BD_RETRY(x)          (((x) & 0x00f0) >>  4)
142 #define TX_BD_UR                (1 <<  8) /* transmitter underrun */
143 #define TX_BD_CRC               (1 << 11) /* TX CRC enable */
144 #define TX_BD_PAD               (1 << 12) /* pad enable for short packets */
145 #define TX_BD_WRAP              (1 << 13)
146 #define TX_BD_IRQ               (1 << 14) /* interrupt request enable */
147 #define TX_BD_READY             (1 << 15) /* TX buffer ready */
148 #define TX_BD_LEN(x)            (((x) & 0xffff) << 16)
149 #define TX_BD_LEN_MASK          (0xffff << 16)
150 
151 #define TX_BD_STATS             (TX_BD_CS | TX_BD_DF | TX_BD_LC | \
152                                 TX_BD_RL | TX_BD_RETRY_MASK | TX_BD_UR)
153 
154 /* RX buffer descriptor */
155 #define RX_BD_LC        (1 <<  0) /* late collision */
156 #define RX_BD_CRC       (1 <<  1) /* RX CRC error */
157 #define RX_BD_SF        (1 <<  2) /* short frame */
158 #define RX_BD_TL        (1 <<  3) /* too long */
159 #define RX_BD_DN        (1 <<  4) /* dribble nibble */
160 #define RX_BD_IS        (1 <<  5) /* invalid symbol */
161 #define RX_BD_OR        (1 <<  6) /* receiver overrun */
162 #define RX_BD_MISS      (1 <<  7)
163 #define RX_BD_CF        (1 <<  8) /* control frame */
164 #define RX_BD_WRAP      (1 << 13)
165 #define RX_BD_IRQ       (1 << 14) /* interrupt request enable */
166 #define RX_BD_EMPTY     (1 << 15)
167 #define RX_BD_LEN(x)    (((x) & 0xffff) << 16)
168 
169 #define RX_BD_STATS     (RX_BD_LC | RX_BD_CRC | RX_BD_SF | RX_BD_TL | \
170                         RX_BD_DN | RX_BD_IS | RX_BD_OR | RX_BD_MISS)
171 
172 #define ETHOC_BUFSIZ            1536
173 #define ETHOC_ZLEN              64
174 #define ETHOC_BD_BASE           0x400
175 #define ETHOC_TIMEOUT           (HZ / 2)
176 #define ETHOC_MII_TIMEOUT       (1 + (HZ / 5))
177 
178 /**
179  * struct ethoc - driver-private device structure
180  * @iobase:     pointer to I/O memory region
181  * @membase:    pointer to buffer memory region
182  * @dma_alloc:  dma allocated buffer size
183  * @io_region_size:     I/O memory region size
184  * @num_bd:     number of buffer descriptors
185  * @num_tx:     number of send buffers
186  * @cur_tx:     last send buffer written
187  * @dty_tx:     last buffer actually sent
188  * @num_rx:     number of receive buffers
189  * @cur_rx:     current receive buffer
190  * @vma:        pointer to array of virtual memory addresses for buffers
191  * @netdev:     pointer to network device structure
192  * @napi:       NAPI structure
193  * @msg_enable: device state flags
194  * @lock:       device lock
195  * @phy:        attached PHY
196  * @mdio:       MDIO bus for PHY access
197  * @phy_id:     address of attached PHY
198  */
199 struct ethoc {
200         void __iomem *iobase;
201         void __iomem *membase;
202         int dma_alloc;
203         resource_size_t io_region_size;
204         bool big_endian;
205 
206         unsigned int num_bd;
207         unsigned int num_tx;
208         unsigned int cur_tx;
209         unsigned int dty_tx;
210 
211         unsigned int num_rx;
212         unsigned int cur_rx;
213 
214         void **vma;
215 
216         struct net_device *netdev;
217         struct napi_struct napi;
218         u32 msg_enable;
219 
220         spinlock_t lock;
221 
222         struct phy_device *phy;
223         struct mii_bus *mdio;
224         struct clk *clk;
225         s8 phy_id;
226 };
227 
228 /**
229  * struct ethoc_bd - buffer descriptor
230  * @stat:       buffer statistics
231  * @addr:       physical memory address
232  */
233 struct ethoc_bd {
234         u32 stat;
235         u32 addr;
236 };
237 
238 static inline u32 ethoc_read(struct ethoc *dev, loff_t offset)
239 {
240         if (dev->big_endian)
241                 return ioread32be(dev->iobase + offset);
242         else
243                 return ioread32(dev->iobase + offset);
244 }
245 
246 static inline void ethoc_write(struct ethoc *dev, loff_t offset, u32 data)
247 {
248         if (dev->big_endian)
249                 iowrite32be(data, dev->iobase + offset);
250         else
251                 iowrite32(data, dev->iobase + offset);
252 }
253 
254 static inline void ethoc_read_bd(struct ethoc *dev, int index,
255                 struct ethoc_bd *bd)
256 {
257         loff_t offset = ETHOC_BD_BASE + (index * sizeof(struct ethoc_bd));
258         bd->stat = ethoc_read(dev, offset + 0);
259         bd->addr = ethoc_read(dev, offset + 4);
260 }
261 
262 static inline void ethoc_write_bd(struct ethoc *dev, int index,
263                 const struct ethoc_bd *bd)
264 {
265         loff_t offset = ETHOC_BD_BASE + (index * sizeof(struct ethoc_bd));
266         ethoc_write(dev, offset + 0, bd->stat);
267         ethoc_write(dev, offset + 4, bd->addr);
268 }
269 
270 static inline void ethoc_enable_irq(struct ethoc *dev, u32 mask)
271 {
272         u32 imask = ethoc_read(dev, INT_MASK);
273         imask |= mask;
274         ethoc_write(dev, INT_MASK, imask);
275 }
276 
277 static inline void ethoc_disable_irq(struct ethoc *dev, u32 mask)
278 {
279         u32 imask = ethoc_read(dev, INT_MASK);
280         imask &= ~mask;
281         ethoc_write(dev, INT_MASK, imask);
282 }
283 
284 static inline void ethoc_ack_irq(struct ethoc *dev, u32 mask)
285 {
286         ethoc_write(dev, INT_SOURCE, mask);
287 }
288 
289 static inline void ethoc_enable_rx_and_tx(struct ethoc *dev)
290 {
291         u32 mode = ethoc_read(dev, MODER);
292         mode |= MODER_RXEN | MODER_TXEN;
293         ethoc_write(dev, MODER, mode);
294 }
295 
296 static inline void ethoc_disable_rx_and_tx(struct ethoc *dev)
297 {
298         u32 mode = ethoc_read(dev, MODER);
299         mode &= ~(MODER_RXEN | MODER_TXEN);
300         ethoc_write(dev, MODER, mode);
301 }
302 
303 static int ethoc_init_ring(struct ethoc *dev, unsigned long mem_start)
304 {
305         struct ethoc_bd bd;
306         int i;
307         void *vma;
308 
309         dev->cur_tx = 0;
310         dev->dty_tx = 0;
311         dev->cur_rx = 0;
312 
313         ethoc_write(dev, TX_BD_NUM, dev->num_tx);
314 
315         /* setup transmission buffers */
316         bd.addr = mem_start;
317         bd.stat = TX_BD_IRQ | TX_BD_CRC;
318         vma = dev->membase;
319 
320         for (i = 0; i < dev->num_tx; i++) {
321                 if (i == dev->num_tx - 1)
322                         bd.stat |= TX_BD_WRAP;
323 
324                 ethoc_write_bd(dev, i, &bd);
325                 bd.addr += ETHOC_BUFSIZ;
326 
327                 dev->vma[i] = vma;
328                 vma += ETHOC_BUFSIZ;
329         }
330 
331         bd.stat = RX_BD_EMPTY | RX_BD_IRQ;
332 
333         for (i = 0; i < dev->num_rx; i++) {
334                 if (i == dev->num_rx - 1)
335                         bd.stat |= RX_BD_WRAP;
336 
337                 ethoc_write_bd(dev, dev->num_tx + i, &bd);
338                 bd.addr += ETHOC_BUFSIZ;
339 
340                 dev->vma[dev->num_tx + i] = vma;
341                 vma += ETHOC_BUFSIZ;
342         }
343 
344         return 0;
345 }
346 
347 static int ethoc_reset(struct ethoc *dev)
348 {
349         u32 mode;
350 
351         /* TODO: reset controller? */
352 
353         ethoc_disable_rx_and_tx(dev);
354 
355         /* TODO: setup registers */
356 
357         /* enable FCS generation and automatic padding */
358         mode = ethoc_read(dev, MODER);
359         mode |= MODER_CRC | MODER_PAD;
360         ethoc_write(dev, MODER, mode);
361 
362         /* set full-duplex mode */
363         mode = ethoc_read(dev, MODER);
364         mode |= MODER_FULLD;
365         ethoc_write(dev, MODER, mode);
366         ethoc_write(dev, IPGT, 0x15);
367 
368         ethoc_ack_irq(dev, INT_MASK_ALL);
369         ethoc_enable_irq(dev, INT_MASK_ALL);
370         ethoc_enable_rx_and_tx(dev);
371         return 0;
372 }
373 
374 static unsigned int ethoc_update_rx_stats(struct ethoc *dev,
375                 struct ethoc_bd *bd)
376 {
377         struct net_device *netdev = dev->netdev;
378         unsigned int ret = 0;
379 
380         if (bd->stat & RX_BD_TL) {
381                 dev_err(&netdev->dev, "RX: frame too long\n");
382                 netdev->stats.rx_length_errors++;
383                 ret++;
384         }
385 
386         if (bd->stat & RX_BD_SF) {
387                 dev_err(&netdev->dev, "RX: frame too short\n");
388                 netdev->stats.rx_length_errors++;
389                 ret++;
390         }
391 
392         if (bd->stat & RX_BD_DN) {
393                 dev_err(&netdev->dev, "RX: dribble nibble\n");
394                 netdev->stats.rx_frame_errors++;
395         }
396 
397         if (bd->stat & RX_BD_CRC) {
398                 dev_err(&netdev->dev, "RX: wrong CRC\n");
399                 netdev->stats.rx_crc_errors++;
400                 ret++;
401         }
402 
403         if (bd->stat & RX_BD_OR) {
404                 dev_err(&netdev->dev, "RX: overrun\n");
405                 netdev->stats.rx_over_errors++;
406                 ret++;
407         }
408 
409         if (bd->stat & RX_BD_MISS)
410                 netdev->stats.rx_missed_errors++;
411 
412         if (bd->stat & RX_BD_LC) {
413                 dev_err(&netdev->dev, "RX: late collision\n");
414                 netdev->stats.collisions++;
415                 ret++;
416         }
417 
418         return ret;
419 }
420 
421 static int ethoc_rx(struct net_device *dev, int limit)
422 {
423         struct ethoc *priv = netdev_priv(dev);
424         int count;
425 
426         for (count = 0; count < limit; ++count) {
427                 unsigned int entry;
428                 struct ethoc_bd bd;
429 
430                 entry = priv->num_tx + priv->cur_rx;
431                 ethoc_read_bd(priv, entry, &bd);
432                 if (bd.stat & RX_BD_EMPTY) {
433                         ethoc_ack_irq(priv, INT_MASK_RX);
434                         /* If packet (interrupt) came in between checking
435                          * BD_EMTPY and clearing the interrupt source, then we
436                          * risk missing the packet as the RX interrupt won't
437                          * trigger right away when we reenable it; hence, check
438                          * BD_EMTPY here again to make sure there isn't such a
439                          * packet waiting for us...
440                          */
441                         ethoc_read_bd(priv, entry, &bd);
442                         if (bd.stat & RX_BD_EMPTY)
443                                 break;
444                 }
445 
446                 if (ethoc_update_rx_stats(priv, &bd) == 0) {
447                         int size = bd.stat >> 16;
448                         struct sk_buff *skb;
449 
450                         size -= 4; /* strip the CRC */
451                         skb = netdev_alloc_skb_ip_align(dev, size);
452 
453                         if (likely(skb)) {
454                                 void *src = priv->vma[entry];
455                                 memcpy_fromio(skb_put(skb, size), src, size);
456                                 skb->protocol = eth_type_trans(skb, dev);
457                                 dev->stats.rx_packets++;
458                                 dev->stats.rx_bytes += size;
459                                 netif_receive_skb(skb);
460                         } else {
461                                 if (net_ratelimit())
462                                         dev_warn(&dev->dev,
463                                             "low on memory - packet dropped\n");
464 
465                                 dev->stats.rx_dropped++;
466                                 break;
467                         }
468                 }
469 
470                 /* clear the buffer descriptor so it can be reused */
471                 bd.stat &= ~RX_BD_STATS;
472                 bd.stat |=  RX_BD_EMPTY;
473                 ethoc_write_bd(priv, entry, &bd);
474                 if (++priv->cur_rx == priv->num_rx)
475                         priv->cur_rx = 0;
476         }
477 
478         return count;
479 }
480 
481 static void ethoc_update_tx_stats(struct ethoc *dev, struct ethoc_bd *bd)
482 {
483         struct net_device *netdev = dev->netdev;
484 
485         if (bd->stat & TX_BD_LC) {
486                 dev_err(&netdev->dev, "TX: late collision\n");
487                 netdev->stats.tx_window_errors++;
488         }
489 
490         if (bd->stat & TX_BD_RL) {
491                 dev_err(&netdev->dev, "TX: retransmit limit\n");
492                 netdev->stats.tx_aborted_errors++;
493         }
494 
495         if (bd->stat & TX_BD_UR) {
496                 dev_err(&netdev->dev, "TX: underrun\n");
497                 netdev->stats.tx_fifo_errors++;
498         }
499 
500         if (bd->stat & TX_BD_CS) {
501                 dev_err(&netdev->dev, "TX: carrier sense lost\n");
502                 netdev->stats.tx_carrier_errors++;
503         }
504 
505         if (bd->stat & TX_BD_STATS)
506                 netdev->stats.tx_errors++;
507 
508         netdev->stats.collisions += (bd->stat >> 4) & 0xf;
509         netdev->stats.tx_bytes += bd->stat >> 16;
510         netdev->stats.tx_packets++;
511 }
512 
513 static int ethoc_tx(struct net_device *dev, int limit)
514 {
515         struct ethoc *priv = netdev_priv(dev);
516         int count;
517         struct ethoc_bd bd;
518 
519         for (count = 0; count < limit; ++count) {
520                 unsigned int entry;
521 
522                 entry = priv->dty_tx & (priv->num_tx-1);
523 
524                 ethoc_read_bd(priv, entry, &bd);
525 
526                 if (bd.stat & TX_BD_READY || (priv->dty_tx == priv->cur_tx)) {
527                         ethoc_ack_irq(priv, INT_MASK_TX);
528                         /* If interrupt came in between reading in the BD
529                          * and clearing the interrupt source, then we risk
530                          * missing the event as the TX interrupt won't trigger
531                          * right away when we reenable it; hence, check
532                          * BD_EMPTY here again to make sure there isn't such an
533                          * event pending...
534                          */
535                         ethoc_read_bd(priv, entry, &bd);
536                         if (bd.stat & TX_BD_READY ||
537                             (priv->dty_tx == priv->cur_tx))
538                                 break;
539                 }
540 
541                 ethoc_update_tx_stats(priv, &bd);
542                 priv->dty_tx++;
543         }
544 
545         if ((priv->cur_tx - priv->dty_tx) <= (priv->num_tx / 2))
546                 netif_wake_queue(dev);
547 
548         return count;
549 }
550 
551 static irqreturn_t ethoc_interrupt(int irq, void *dev_id)
552 {
553         struct net_device *dev = dev_id;
554         struct ethoc *priv = netdev_priv(dev);
555         u32 pending;
556         u32 mask;
557 
558         /* Figure out what triggered the interrupt...
559          * The tricky bit here is that the interrupt source bits get
560          * set in INT_SOURCE for an event regardless of whether that
561          * event is masked or not.  Thus, in order to figure out what
562          * triggered the interrupt, we need to remove the sources
563          * for all events that are currently masked.  This behaviour
564          * is not particularly well documented but reasonable...
565          */
566         mask = ethoc_read(priv, INT_MASK);
567         pending = ethoc_read(priv, INT_SOURCE);
568         pending &= mask;
569 
570         if (unlikely(pending == 0))
571                 return IRQ_NONE;
572 
573         ethoc_ack_irq(priv, pending);
574 
575         /* We always handle the dropped packet interrupt */
576         if (pending & INT_MASK_BUSY) {
577                 dev_err(&dev->dev, "packet dropped\n");
578                 dev->stats.rx_dropped++;
579         }
580 
581         /* Handle receive/transmit event by switching to polling */
582         if (pending & (INT_MASK_TX | INT_MASK_RX)) {
583                 ethoc_disable_irq(priv, INT_MASK_TX | INT_MASK_RX);
584                 napi_schedule(&priv->napi);
585         }
586 
587         return IRQ_HANDLED;
588 }
589 
590 static int ethoc_get_mac_address(struct net_device *dev, void *addr)
591 {
592         struct ethoc *priv = netdev_priv(dev);
593         u8 *mac = (u8 *)addr;
594         u32 reg;
595 
596         reg = ethoc_read(priv, MAC_ADDR0);
597         mac[2] = (reg >> 24) & 0xff;
598         mac[3] = (reg >> 16) & 0xff;
599         mac[4] = (reg >>  8) & 0xff;
600         mac[5] = (reg >>  0) & 0xff;
601 
602         reg = ethoc_read(priv, MAC_ADDR1);
603         mac[0] = (reg >>  8) & 0xff;
604         mac[1] = (reg >>  0) & 0xff;
605 
606         return 0;
607 }
608 
609 static int ethoc_poll(struct napi_struct *napi, int budget)
610 {
611         struct ethoc *priv = container_of(napi, struct ethoc, napi);
612         int rx_work_done = 0;
613         int tx_work_done = 0;
614 
615         rx_work_done = ethoc_rx(priv->netdev, budget);
616         tx_work_done = ethoc_tx(priv->netdev, budget);
617 
618         if (rx_work_done < budget && tx_work_done < budget) {
619                 napi_complete(napi);
620                 ethoc_enable_irq(priv, INT_MASK_TX | INT_MASK_RX);
621         }
622 
623         return rx_work_done;
624 }
625 
626 static int ethoc_mdio_read(struct mii_bus *bus, int phy, int reg)
627 {
628         struct ethoc *priv = bus->priv;
629         int i;
630 
631         ethoc_write(priv, MIIADDRESS, MIIADDRESS_ADDR(phy, reg));
632         ethoc_write(priv, MIICOMMAND, MIICOMMAND_READ);
633 
634         for (i = 0; i < 5; i++) {
635                 u32 status = ethoc_read(priv, MIISTATUS);
636                 if (!(status & MIISTATUS_BUSY)) {
637                         u32 data = ethoc_read(priv, MIIRX_DATA);
638                         /* reset MII command register */
639                         ethoc_write(priv, MIICOMMAND, 0);
640                         return data;
641                 }
642                 usleep_range(100, 200);
643         }
644 
645         return -EBUSY;
646 }
647 
648 static int ethoc_mdio_write(struct mii_bus *bus, int phy, int reg, u16 val)
649 {
650         struct ethoc *priv = bus->priv;
651         int i;
652 
653         ethoc_write(priv, MIIADDRESS, MIIADDRESS_ADDR(phy, reg));
654         ethoc_write(priv, MIITX_DATA, val);
655         ethoc_write(priv, MIICOMMAND, MIICOMMAND_WRITE);
656 
657         for (i = 0; i < 5; i++) {
658                 u32 stat = ethoc_read(priv, MIISTATUS);
659                 if (!(stat & MIISTATUS_BUSY)) {
660                         /* reset MII command register */
661                         ethoc_write(priv, MIICOMMAND, 0);
662                         return 0;
663                 }
664                 usleep_range(100, 200);
665         }
666 
667         return -EBUSY;
668 }
669 
670 static void ethoc_mdio_poll(struct net_device *dev)
671 {
672 }
673 
674 static int ethoc_mdio_probe(struct net_device *dev)
675 {
676         struct ethoc *priv = netdev_priv(dev);
677         struct phy_device *phy;
678         int err;
679 
680         if (priv->phy_id != -1)
681                 phy = mdiobus_get_phy(priv->mdio, priv->phy_id);
682         else
683                 phy = phy_find_first(priv->mdio);
684 
685         if (!phy) {
686                 dev_err(&dev->dev, "no PHY found\n");
687                 return -ENXIO;
688         }
689 
690         err = phy_connect_direct(dev, phy, ethoc_mdio_poll,
691                                  PHY_INTERFACE_MODE_GMII);
692         if (err) {
693                 dev_err(&dev->dev, "could not attach to PHY\n");
694                 return err;
695         }
696 
697         priv->phy = phy;
698         phy->advertising &= ~(ADVERTISED_1000baseT_Full |
699                               ADVERTISED_1000baseT_Half);
700         phy->supported &= ~(SUPPORTED_1000baseT_Full |
701                             SUPPORTED_1000baseT_Half);
702 
703         return 0;
704 }
705 
706 static int ethoc_open(struct net_device *dev)
707 {
708         struct ethoc *priv = netdev_priv(dev);
709         int ret;
710 
711         ret = request_irq(dev->irq, ethoc_interrupt, IRQF_SHARED,
712                         dev->name, dev);
713         if (ret)
714                 return ret;
715 
716         ethoc_init_ring(priv, dev->mem_start);
717         ethoc_reset(priv);
718 
719         if (netif_queue_stopped(dev)) {
720                 dev_dbg(&dev->dev, " resuming queue\n");
721                 netif_wake_queue(dev);
722         } else {
723                 dev_dbg(&dev->dev, " starting queue\n");
724                 netif_start_queue(dev);
725         }
726 
727         phy_start(priv->phy);
728         napi_enable(&priv->napi);
729 
730         if (netif_msg_ifup(priv)) {
731                 dev_info(&dev->dev, "I/O: %08lx Memory: %08lx-%08lx\n",
732                                 dev->base_addr, dev->mem_start, dev->mem_end);
733         }
734 
735         return 0;
736 }
737 
738 static int ethoc_stop(struct net_device *dev)
739 {
740         struct ethoc *priv = netdev_priv(dev);
741 
742         napi_disable(&priv->napi);
743 
744         if (priv->phy)
745                 phy_stop(priv->phy);
746 
747         ethoc_disable_rx_and_tx(priv);
748         free_irq(dev->irq, dev);
749 
750         if (!netif_queue_stopped(dev))
751                 netif_stop_queue(dev);
752 
753         return 0;
754 }
755 
756 static int ethoc_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
757 {
758         struct ethoc *priv = netdev_priv(dev);
759         struct mii_ioctl_data *mdio = if_mii(ifr);
760         struct phy_device *phy = NULL;
761 
762         if (!netif_running(dev))
763                 return -EINVAL;
764 
765         if (cmd != SIOCGMIIPHY) {
766                 if (mdio->phy_id >= PHY_MAX_ADDR)
767                         return -ERANGE;
768 
769                 phy = mdiobus_get_phy(priv->mdio, mdio->phy_id);
770                 if (!phy)
771                         return -ENODEV;
772         } else {
773                 phy = priv->phy;
774         }
775 
776         return phy_mii_ioctl(phy, ifr, cmd);
777 }
778 
779 static void ethoc_do_set_mac_address(struct net_device *dev)
780 {
781         struct ethoc *priv = netdev_priv(dev);
782         unsigned char *mac = dev->dev_addr;
783 
784         ethoc_write(priv, MAC_ADDR0, (mac[2] << 24) | (mac[3] << 16) |
785                                      (mac[4] <<  8) | (mac[5] <<  0));
786         ethoc_write(priv, MAC_ADDR1, (mac[0] <<  8) | (mac[1] <<  0));
787 }
788 
789 static int ethoc_set_mac_address(struct net_device *dev, void *p)
790 {
791         const struct sockaddr *addr = p;
792 
793         if (!is_valid_ether_addr(addr->sa_data))
794                 return -EADDRNOTAVAIL;
795         memcpy(dev->dev_addr, addr->sa_data, ETH_ALEN);
796         ethoc_do_set_mac_address(dev);
797         return 0;
798 }
799 
800 static void ethoc_set_multicast_list(struct net_device *dev)
801 {
802         struct ethoc *priv = netdev_priv(dev);
803         u32 mode = ethoc_read(priv, MODER);
804         struct netdev_hw_addr *ha;
805         u32 hash[2] = { 0, 0 };
806 
807         /* set loopback mode if requested */
808         if (dev->flags & IFF_LOOPBACK)
809                 mode |=  MODER_LOOP;
810         else
811                 mode &= ~MODER_LOOP;
812 
813         /* receive broadcast frames if requested */
814         if (dev->flags & IFF_BROADCAST)
815                 mode &= ~MODER_BRO;
816         else
817                 mode |=  MODER_BRO;
818 
819         /* enable promiscuous mode if requested */
820         if (dev->flags & IFF_PROMISC)
821                 mode |=  MODER_PRO;
822         else
823                 mode &= ~MODER_PRO;
824 
825         ethoc_write(priv, MODER, mode);
826 
827         /* receive multicast frames */
828         if (dev->flags & IFF_ALLMULTI) {
829                 hash[0] = 0xffffffff;
830                 hash[1] = 0xffffffff;
831         } else {
832                 netdev_for_each_mc_addr(ha, dev) {
833                         u32 crc = ether_crc(ETH_ALEN, ha->addr);
834                         int bit = (crc >> 26) & 0x3f;
835                         hash[bit >> 5] |= 1 << (bit & 0x1f);
836                 }
837         }
838 
839         ethoc_write(priv, ETH_HASH0, hash[0]);
840         ethoc_write(priv, ETH_HASH1, hash[1]);
841 }
842 
843 static int ethoc_change_mtu(struct net_device *dev, int new_mtu)
844 {
845         return -ENOSYS;
846 }
847 
848 static void ethoc_tx_timeout(struct net_device *dev)
849 {
850         struct ethoc *priv = netdev_priv(dev);
851         u32 pending = ethoc_read(priv, INT_SOURCE);
852         if (likely(pending))
853                 ethoc_interrupt(dev->irq, dev);
854 }
855 
856 static netdev_tx_t ethoc_start_xmit(struct sk_buff *skb, struct net_device *dev)
857 {
858         struct ethoc *priv = netdev_priv(dev);
859         struct ethoc_bd bd;
860         unsigned int entry;
861         void *dest;
862 
863         if (skb_put_padto(skb, ETHOC_ZLEN)) {
864                 dev->stats.tx_errors++;
865                 goto out_no_free;
866         }
867 
868         if (unlikely(skb->len > ETHOC_BUFSIZ)) {
869                 dev->stats.tx_errors++;
870                 goto out;
871         }
872 
873         entry = priv->cur_tx % priv->num_tx;
874         spin_lock_irq(&priv->lock);
875         priv->cur_tx++;
876 
877         ethoc_read_bd(priv, entry, &bd);
878         if (unlikely(skb->len < ETHOC_ZLEN))
879                 bd.stat |=  TX_BD_PAD;
880         else
881                 bd.stat &= ~TX_BD_PAD;
882 
883         dest = priv->vma[entry];
884         memcpy_toio(dest, skb->data, skb->len);
885 
886         bd.stat &= ~(TX_BD_STATS | TX_BD_LEN_MASK);
887         bd.stat |= TX_BD_LEN(skb->len);
888         ethoc_write_bd(priv, entry, &bd);
889 
890         bd.stat |= TX_BD_READY;
891         ethoc_write_bd(priv, entry, &bd);
892 
893         if (priv->cur_tx == (priv->dty_tx + priv->num_tx)) {
894                 dev_dbg(&dev->dev, "stopping queue\n");
895                 netif_stop_queue(dev);
896         }
897 
898         spin_unlock_irq(&priv->lock);
899         skb_tx_timestamp(skb);
900 out:
901         dev_kfree_skb(skb);
902 out_no_free:
903         return NETDEV_TX_OK;
904 }
905 
906 static int ethoc_get_settings(struct net_device *dev, struct ethtool_cmd *cmd)
907 {
908         struct ethoc *priv = netdev_priv(dev);
909         struct phy_device *phydev = priv->phy;
910 
911         if (!phydev)
912                 return -EOPNOTSUPP;
913 
914         return phy_ethtool_gset(phydev, cmd);
915 }
916 
917 static int ethoc_set_settings(struct net_device *dev, struct ethtool_cmd *cmd)
918 {
919         struct ethoc *priv = netdev_priv(dev);
920         struct phy_device *phydev = priv->phy;
921 
922         if (!phydev)
923                 return -EOPNOTSUPP;
924 
925         return phy_ethtool_sset(phydev, cmd);
926 }
927 
928 static int ethoc_get_regs_len(struct net_device *netdev)
929 {
930         return ETH_END;
931 }
932 
933 static void ethoc_get_regs(struct net_device *dev, struct ethtool_regs *regs,
934                            void *p)
935 {
936         struct ethoc *priv = netdev_priv(dev);
937         u32 *regs_buff = p;
938         unsigned i;
939 
940         regs->version = 0;
941         for (i = 0; i < ETH_END / sizeof(u32); ++i)
942                 regs_buff[i] = ethoc_read(priv, i * sizeof(u32));
943 }
944 
945 static void ethoc_get_ringparam(struct net_device *dev,
946                                 struct ethtool_ringparam *ring)
947 {
948         struct ethoc *priv = netdev_priv(dev);
949 
950         ring->rx_max_pending = priv->num_bd - 1;
951         ring->rx_mini_max_pending = 0;
952         ring->rx_jumbo_max_pending = 0;
953         ring->tx_max_pending = priv->num_bd - 1;
954 
955         ring->rx_pending = priv->num_rx;
956         ring->rx_mini_pending = 0;
957         ring->rx_jumbo_pending = 0;
958         ring->tx_pending = priv->num_tx;
959 }
960 
961 static int ethoc_set_ringparam(struct net_device *dev,
962                                struct ethtool_ringparam *ring)
963 {
964         struct ethoc *priv = netdev_priv(dev);
965 
966         if (ring->tx_pending < 1 || ring->rx_pending < 1 ||
967             ring->tx_pending + ring->rx_pending > priv->num_bd)
968                 return -EINVAL;
969         if (ring->rx_mini_pending || ring->rx_jumbo_pending)
970                 return -EINVAL;
971 
972         if (netif_running(dev)) {
973                 netif_tx_disable(dev);
974                 ethoc_disable_rx_and_tx(priv);
975                 ethoc_disable_irq(priv, INT_MASK_TX | INT_MASK_RX);
976                 synchronize_irq(dev->irq);
977         }
978 
979         priv->num_tx = rounddown_pow_of_two(ring->tx_pending);
980         priv->num_rx = ring->rx_pending;
981         ethoc_init_ring(priv, dev->mem_start);
982 
983         if (netif_running(dev)) {
984                 ethoc_enable_irq(priv, INT_MASK_TX | INT_MASK_RX);
985                 ethoc_enable_rx_and_tx(priv);
986                 netif_wake_queue(dev);
987         }
988         return 0;
989 }
990 
991 const struct ethtool_ops ethoc_ethtool_ops = {
992         .get_settings = ethoc_get_settings,
993         .set_settings = ethoc_set_settings,
994         .get_regs_len = ethoc_get_regs_len,
995         .get_regs = ethoc_get_regs,
996         .get_link = ethtool_op_get_link,
997         .get_ringparam = ethoc_get_ringparam,
998         .set_ringparam = ethoc_set_ringparam,
999         .get_ts_info = ethtool_op_get_ts_info,
1000 };
1001 
1002 static const struct net_device_ops ethoc_netdev_ops = {
1003         .ndo_open = ethoc_open,
1004         .ndo_stop = ethoc_stop,
1005         .ndo_do_ioctl = ethoc_ioctl,
1006         .ndo_set_mac_address = ethoc_set_mac_address,
1007         .ndo_set_rx_mode = ethoc_set_multicast_list,
1008         .ndo_change_mtu = ethoc_change_mtu,
1009         .ndo_tx_timeout = ethoc_tx_timeout,
1010         .ndo_start_xmit = ethoc_start_xmit,
1011 };
1012 
1013 /**
1014  * ethoc_probe - initialize OpenCores ethernet MAC
1015  * pdev:        platform device
1016  */
1017 static int ethoc_probe(struct platform_device *pdev)
1018 {
1019         struct net_device *netdev = NULL;
1020         struct resource *res = NULL;
1021         struct resource *mmio = NULL;
1022         struct resource *mem = NULL;
1023         struct ethoc *priv = NULL;
1024         int num_bd;
1025         int ret = 0;
1026         bool random_mac = false;
1027         struct ethoc_platform_data *pdata = dev_get_platdata(&pdev->dev);
1028         u32 eth_clkfreq = pdata ? pdata->eth_clkfreq : 0;
1029 
1030         /* allocate networking device */
1031         netdev = alloc_etherdev(sizeof(struct ethoc));
1032         if (!netdev) {
1033                 ret = -ENOMEM;
1034                 goto out;
1035         }
1036 
1037         SET_NETDEV_DEV(netdev, &pdev->dev);
1038         platform_set_drvdata(pdev, netdev);
1039 
1040         /* obtain I/O memory space */
1041         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1042         if (!res) {
1043                 dev_err(&pdev->dev, "cannot obtain I/O memory space\n");
1044                 ret = -ENXIO;
1045                 goto free;
1046         }
1047 
1048         mmio = devm_request_mem_region(&pdev->dev, res->start,
1049                         resource_size(res), res->name);
1050         if (!mmio) {
1051                 dev_err(&pdev->dev, "cannot request I/O memory space\n");
1052                 ret = -ENXIO;
1053                 goto free;
1054         }
1055 
1056         netdev->base_addr = mmio->start;
1057 
1058         /* obtain buffer memory space */
1059         res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
1060         if (res) {
1061                 mem = devm_request_mem_region(&pdev->dev, res->start,
1062                         resource_size(res), res->name);
1063                 if (!mem) {
1064                         dev_err(&pdev->dev, "cannot request memory space\n");
1065                         ret = -ENXIO;
1066                         goto free;
1067                 }
1068 
1069                 netdev->mem_start = mem->start;
1070                 netdev->mem_end   = mem->end;
1071         }
1072 
1073 
1074         /* obtain device IRQ number */
1075         res = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
1076         if (!res) {
1077                 dev_err(&pdev->dev, "cannot obtain IRQ\n");
1078                 ret = -ENXIO;
1079                 goto free;
1080         }
1081 
1082         netdev->irq = res->start;
1083 
1084         /* setup driver-private data */
1085         priv = netdev_priv(netdev);
1086         priv->netdev = netdev;
1087         priv->dma_alloc = 0;
1088         priv->io_region_size = resource_size(mmio);
1089 
1090         priv->iobase = devm_ioremap_nocache(&pdev->dev, netdev->base_addr,
1091                         resource_size(mmio));
1092         if (!priv->iobase) {
1093                 dev_err(&pdev->dev, "cannot remap I/O memory space\n");
1094                 ret = -ENXIO;
1095                 goto free;
1096         }
1097 
1098         if (netdev->mem_end) {
1099                 priv->membase = devm_ioremap_nocache(&pdev->dev,
1100                         netdev->mem_start, resource_size(mem));
1101                 if (!priv->membase) {
1102                         dev_err(&pdev->dev, "cannot remap memory space\n");
1103                         ret = -ENXIO;
1104                         goto free;
1105                 }
1106         } else {
1107                 /* Allocate buffer memory */
1108                 priv->membase = dmam_alloc_coherent(&pdev->dev,
1109                         buffer_size, (void *)&netdev->mem_start,
1110                         GFP_KERNEL);
1111                 if (!priv->membase) {
1112                         dev_err(&pdev->dev, "cannot allocate %dB buffer\n",
1113                                 buffer_size);
1114                         ret = -ENOMEM;
1115                         goto free;
1116                 }
1117                 netdev->mem_end = netdev->mem_start + buffer_size;
1118                 priv->dma_alloc = buffer_size;
1119         }
1120 
1121         priv->big_endian = pdata ? pdata->big_endian :
1122                 of_device_is_big_endian(pdev->dev.of_node);
1123 
1124         /* calculate the number of TX/RX buffers, maximum 128 supported */
1125         num_bd = min_t(unsigned int,
1126                 128, (netdev->mem_end - netdev->mem_start + 1) / ETHOC_BUFSIZ);
1127         if (num_bd < 4) {
1128                 ret = -ENODEV;
1129                 goto free;
1130         }
1131         priv->num_bd = num_bd;
1132         /* num_tx must be a power of two */
1133         priv->num_tx = rounddown_pow_of_two(num_bd >> 1);
1134         priv->num_rx = num_bd - priv->num_tx;
1135 
1136         dev_dbg(&pdev->dev, "ethoc: num_tx: %d num_rx: %d\n",
1137                 priv->num_tx, priv->num_rx);
1138 
1139         priv->vma = devm_kzalloc(&pdev->dev, num_bd*sizeof(void *), GFP_KERNEL);
1140         if (!priv->vma) {
1141                 ret = -ENOMEM;
1142                 goto free;
1143         }
1144 
1145         /* Allow the platform setup code to pass in a MAC address. */
1146         if (pdata) {
1147                 memcpy(netdev->dev_addr, pdata->hwaddr, IFHWADDRLEN);
1148                 priv->phy_id = pdata->phy_id;
1149         } else {
1150                 const uint8_t *mac;
1151 
1152                 mac = of_get_property(pdev->dev.of_node,
1153                                       "local-mac-address",
1154                                       NULL);
1155                 if (mac)
1156                         memcpy(netdev->dev_addr, mac, IFHWADDRLEN);
1157                 priv->phy_id = -1;
1158         }
1159 
1160         /* Check that the given MAC address is valid. If it isn't, read the
1161          * current MAC from the controller.
1162          */
1163         if (!is_valid_ether_addr(netdev->dev_addr))
1164                 ethoc_get_mac_address(netdev, netdev->dev_addr);
1165 
1166         /* Check the MAC again for validity, if it still isn't choose and
1167          * program a random one.
1168          */
1169         if (!is_valid_ether_addr(netdev->dev_addr)) {
1170                 eth_random_addr(netdev->dev_addr);
1171                 random_mac = true;
1172         }
1173 
1174         ethoc_do_set_mac_address(netdev);
1175 
1176         if (random_mac)
1177                 netdev->addr_assign_type = NET_ADDR_RANDOM;
1178 
1179         /* Allow the platform setup code to adjust MII management bus clock. */
1180         if (!eth_clkfreq) {
1181                 struct clk *clk = devm_clk_get(&pdev->dev, NULL);
1182 
1183                 if (!IS_ERR(clk)) {
1184                         priv->clk = clk;
1185                         clk_prepare_enable(clk);
1186                         eth_clkfreq = clk_get_rate(clk);
1187                 }
1188         }
1189         if (eth_clkfreq) {
1190                 u32 clkdiv = MIIMODER_CLKDIV(eth_clkfreq / 2500000 + 1);
1191 
1192                 if (!clkdiv)
1193                         clkdiv = 2;
1194                 dev_dbg(&pdev->dev, "setting MII clkdiv to %u\n", clkdiv);
1195                 ethoc_write(priv, MIIMODER,
1196                             (ethoc_read(priv, MIIMODER) & MIIMODER_NOPRE) |
1197                             clkdiv);
1198         }
1199 
1200         /* register MII bus */
1201         priv->mdio = mdiobus_alloc();
1202         if (!priv->mdio) {
1203                 ret = -ENOMEM;
1204                 goto free2;
1205         }
1206 
1207         priv->mdio->name = "ethoc-mdio";
1208         snprintf(priv->mdio->id, MII_BUS_ID_SIZE, "%s-%d",
1209                         priv->mdio->name, pdev->id);
1210         priv->mdio->read = ethoc_mdio_read;
1211         priv->mdio->write = ethoc_mdio_write;
1212         priv->mdio->priv = priv;
1213 
1214         ret = mdiobus_register(priv->mdio);
1215         if (ret) {
1216                 dev_err(&netdev->dev, "failed to register MDIO bus\n");
1217                 goto free2;
1218         }
1219 
1220         ret = ethoc_mdio_probe(netdev);
1221         if (ret) {
1222                 dev_err(&netdev->dev, "failed to probe MDIO bus\n");
1223                 goto error;
1224         }
1225 
1226         /* setup the net_device structure */
1227         netdev->netdev_ops = &ethoc_netdev_ops;
1228         netdev->watchdog_timeo = ETHOC_TIMEOUT;
1229         netdev->features |= 0;
1230         netdev->ethtool_ops = &ethoc_ethtool_ops;
1231 
1232         /* setup NAPI */
1233         netif_napi_add(netdev, &priv->napi, ethoc_poll, 64);
1234 
1235         spin_lock_init(&priv->lock);
1236 
1237         ret = register_netdev(netdev);
1238         if (ret < 0) {
1239                 dev_err(&netdev->dev, "failed to register interface\n");
1240                 goto error2;
1241         }
1242 
1243         goto out;
1244 
1245 error2:
1246         netif_napi_del(&priv->napi);
1247 error:
1248         mdiobus_unregister(priv->mdio);
1249         mdiobus_free(priv->mdio);
1250 free2:
1251         if (priv->clk)
1252                 clk_disable_unprepare(priv->clk);
1253 free:
1254         free_netdev(netdev);
1255 out:
1256         return ret;
1257 }
1258 
1259 /**
1260  * ethoc_remove - shutdown OpenCores ethernet MAC
1261  * @pdev:       platform device
1262  */
1263 static int ethoc_remove(struct platform_device *pdev)
1264 {
1265         struct net_device *netdev = platform_get_drvdata(pdev);
1266         struct ethoc *priv = netdev_priv(netdev);
1267 
1268         if (netdev) {
1269                 netif_napi_del(&priv->napi);
1270                 phy_disconnect(priv->phy);
1271                 priv->phy = NULL;
1272 
1273                 if (priv->mdio) {
1274                         mdiobus_unregister(priv->mdio);
1275                         mdiobus_free(priv->mdio);
1276                 }
1277                 if (priv->clk)
1278                         clk_disable_unprepare(priv->clk);
1279                 unregister_netdev(netdev);
1280                 free_netdev(netdev);
1281         }
1282 
1283         return 0;
1284 }
1285 
1286 #ifdef CONFIG_PM
1287 static int ethoc_suspend(struct platform_device *pdev, pm_message_t state)
1288 {
1289         return -ENOSYS;
1290 }
1291 
1292 static int ethoc_resume(struct platform_device *pdev)
1293 {
1294         return -ENOSYS;
1295 }
1296 #else
1297 # define ethoc_suspend NULL
1298 # define ethoc_resume  NULL
1299 #endif
1300 
1301 static const struct of_device_id ethoc_match[] = {
1302         { .compatible = "opencores,ethoc", },
1303         {},
1304 };
1305 MODULE_DEVICE_TABLE(of, ethoc_match);
1306 
1307 static struct platform_driver ethoc_driver = {
1308         .probe   = ethoc_probe,
1309         .remove  = ethoc_remove,
1310         .suspend = ethoc_suspend,
1311         .resume  = ethoc_resume,
1312         .driver  = {
1313                 .name = "ethoc",
1314                 .of_match_table = ethoc_match,
1315         },
1316 };
1317 
1318 module_platform_driver(ethoc_driver);
1319 
1320 MODULE_AUTHOR("Thierry Reding <thierry.reding@avionic-design.de>");
1321 MODULE_DESCRIPTION("OpenCores Ethernet MAC driver");
1322 MODULE_LICENSE("GPL v2");
1323 
1324 

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