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ftmac100.c
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1 /*
2  * Faraday FTMAC100 10/100 Ethernet
3  *
4  * (C) Copyright 2009-2011 Faraday Technology
5  * Po-Yu Chuang <[email protected]>
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 as published by
9  * the Free Software Foundation; either version 2 of the License, or
10  * (at your option) any later version.
11  *
12  * This program is distributed in the hope that it will be useful,
13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15  * GNU General Public License for more details.
16  *
17  * You should have received a copy of the GNU General Public License
18  * along with this program; if not, write to the Free Software
19  * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
20  */
21 
22 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
23 
24 #include <linux/dma-mapping.h>
25 #include <linux/etherdevice.h>
26 #include <linux/ethtool.h>
27 #include <linux/init.h>
28 #include <linux/interrupt.h>
29 #include <linux/io.h>
30 #include <linux/mii.h>
31 #include <linux/module.h>
32 #include <linux/netdevice.h>
33 #include <linux/platform_device.h>
34 
35 #include "ftmac100.h"
36 
37 #define DRV_NAME "ftmac100"
38 #define DRV_VERSION "0.2"
39 
40 #define RX_QUEUE_ENTRIES 128 /* must be power of 2 */
41 #define TX_QUEUE_ENTRIES 16 /* must be power of 2 */
42 
43 #define MAX_PKT_SIZE 1518
44 #define RX_BUF_SIZE 2044 /* must be smaller than 0x7ff */
45 
46 #if MAX_PKT_SIZE > 0x7ff
47 #error invalid MAX_PKT_SIZE
48 #endif
49 
50 #if RX_BUF_SIZE > 0x7ff || RX_BUF_SIZE > PAGE_SIZE
51 #error invalid RX_BUF_SIZE
52 #endif
53 
54 /******************************************************************************
55  * private data
56  *****************************************************************************/
60 };
61 
62 struct ftmac100 {
63  struct resource *res;
64  void __iomem *base;
65  int irq;
66 
69 
70  unsigned int rx_pointer;
71  unsigned int tx_clean_pointer;
72  unsigned int tx_pointer;
73  unsigned int tx_pending;
74 
76 
77  struct net_device *netdev;
78  struct device *dev;
79  struct napi_struct napi;
80 
81  struct mii_if_info mii;
82 };
83 
84 static int ftmac100_alloc_rx_page(struct ftmac100 *priv,
85  struct ftmac100_rxdes *rxdes, gfp_t gfp);
86 
87 /******************************************************************************
88  * internal functions (hardware register access)
89  *****************************************************************************/
90 #define INT_MASK_ALL_ENABLED (FTMAC100_INT_RPKT_FINISH | \
91  FTMAC100_INT_NORXBUF | \
92  FTMAC100_INT_XPKT_OK | \
93  FTMAC100_INT_XPKT_LOST | \
94  FTMAC100_INT_RPKT_LOST | \
95  FTMAC100_INT_AHB_ERR | \
96  FTMAC100_INT_PHYSTS_CHG)
97 
98 #define INT_MASK_ALL_DISABLED 0
99 
100 static void ftmac100_enable_all_int(struct ftmac100 *priv)
101 {
103 }
104 
105 static void ftmac100_disable_all_int(struct ftmac100 *priv)
106 {
108 }
109 
110 static void ftmac100_set_rx_ring_base(struct ftmac100 *priv, dma_addr_t addr)
111 {
112  iowrite32(addr, priv->base + FTMAC100_OFFSET_RXR_BADR);
113 }
114 
115 static void ftmac100_set_tx_ring_base(struct ftmac100 *priv, dma_addr_t addr)
116 {
117  iowrite32(addr, priv->base + FTMAC100_OFFSET_TXR_BADR);
118 }
119 
120 static void ftmac100_txdma_start_polling(struct ftmac100 *priv)
121 {
122  iowrite32(1, priv->base + FTMAC100_OFFSET_TXPD);
123 }
124 
125 static int ftmac100_reset(struct ftmac100 *priv)
126 {
127  struct net_device *netdev = priv->netdev;
128  int i;
129 
130  /* NOTE: reset clears all registers */
132 
133  for (i = 0; i < 5; i++) {
134  unsigned int maccr;
135 
136  maccr = ioread32(priv->base + FTMAC100_OFFSET_MACCR);
137  if (!(maccr & FTMAC100_MACCR_SW_RST)) {
138  /*
139  * FTMAC100_MACCR_SW_RST cleared does not indicate
140  * that hardware reset completed (what the f*ck).
141  * We still need to wait for a while.
142  */
143  udelay(500);
144  return 0;
145  }
146 
147  udelay(1000);
148  }
149 
150  netdev_err(netdev, "software reset failed\n");
151  return -EIO;
152 }
153 
154 static void ftmac100_set_mac(struct ftmac100 *priv, const unsigned char *mac)
155 {
156  unsigned int maddr = mac[0] << 8 | mac[1];
157  unsigned int laddr = mac[2] << 24 | mac[3] << 16 | mac[4] << 8 | mac[5];
158 
159  iowrite32(maddr, priv->base + FTMAC100_OFFSET_MAC_MADR);
160  iowrite32(laddr, priv->base + FTMAC100_OFFSET_MAC_LADR);
161 }
162 
163 #define MACCR_ENABLE_ALL (FTMAC100_MACCR_XMT_EN | \
164  FTMAC100_MACCR_RCV_EN | \
165  FTMAC100_MACCR_XDMA_EN | \
166  FTMAC100_MACCR_RDMA_EN | \
167  FTMAC100_MACCR_CRC_APD | \
168  FTMAC100_MACCR_FULLDUP | \
169  FTMAC100_MACCR_RX_RUNT | \
170  FTMAC100_MACCR_RX_BROADPKT)
171 
172 static int ftmac100_start_hw(struct ftmac100 *priv)
173 {
174  struct net_device *netdev = priv->netdev;
175 
176  if (ftmac100_reset(priv))
177  return -EIO;
178 
179  /* setup ring buffer base registers */
180  ftmac100_set_rx_ring_base(priv,
181  priv->descs_dma_addr +
182  offsetof(struct ftmac100_descs, rxdes));
183  ftmac100_set_tx_ring_base(priv,
184  priv->descs_dma_addr +
185  offsetof(struct ftmac100_descs, txdes));
186 
188 
189  ftmac100_set_mac(priv, netdev->dev_addr);
190 
192  return 0;
193 }
194 
195 static void ftmac100_stop_hw(struct ftmac100 *priv)
196 {
198 }
199 
200 /******************************************************************************
201  * internal functions (receive descriptor)
202  *****************************************************************************/
203 static bool ftmac100_rxdes_first_segment(struct ftmac100_rxdes *rxdes)
204 {
205  return rxdes->rxdes0 & cpu_to_le32(FTMAC100_RXDES0_FRS);
206 }
207 
208 static bool ftmac100_rxdes_last_segment(struct ftmac100_rxdes *rxdes)
209 {
210  return rxdes->rxdes0 & cpu_to_le32(FTMAC100_RXDES0_LRS);
211 }
212 
213 static bool ftmac100_rxdes_owned_by_dma(struct ftmac100_rxdes *rxdes)
214 {
216 }
217 
218 static void ftmac100_rxdes_set_dma_own(struct ftmac100_rxdes *rxdes)
219 {
220  /* clear status bits */
222 }
223 
224 static bool ftmac100_rxdes_rx_error(struct ftmac100_rxdes *rxdes)
225 {
226  return rxdes->rxdes0 & cpu_to_le32(FTMAC100_RXDES0_RX_ERR);
227 }
228 
229 static bool ftmac100_rxdes_crc_error(struct ftmac100_rxdes *rxdes)
230 {
231  return rxdes->rxdes0 & cpu_to_le32(FTMAC100_RXDES0_CRC_ERR);
232 }
233 
234 static bool ftmac100_rxdes_frame_too_long(struct ftmac100_rxdes *rxdes)
235 {
236  return rxdes->rxdes0 & cpu_to_le32(FTMAC100_RXDES0_FTL);
237 }
238 
239 static bool ftmac100_rxdes_runt(struct ftmac100_rxdes *rxdes)
240 {
241  return rxdes->rxdes0 & cpu_to_le32(FTMAC100_RXDES0_RUNT);
242 }
243 
244 static bool ftmac100_rxdes_odd_nibble(struct ftmac100_rxdes *rxdes)
245 {
247 }
248 
249 static unsigned int ftmac100_rxdes_frame_length(struct ftmac100_rxdes *rxdes)
250 {
251  return le32_to_cpu(rxdes->rxdes0) & FTMAC100_RXDES0_RFL;
252 }
253 
254 static bool ftmac100_rxdes_multicast(struct ftmac100_rxdes *rxdes)
255 {
257 }
258 
259 static void ftmac100_rxdes_set_buffer_size(struct ftmac100_rxdes *rxdes,
260  unsigned int size)
261 {
264 }
265 
266 static void ftmac100_rxdes_set_end_of_ring(struct ftmac100_rxdes *rxdes)
267 {
269 }
270 
271 static void ftmac100_rxdes_set_dma_addr(struct ftmac100_rxdes *rxdes,
273 {
274  rxdes->rxdes2 = cpu_to_le32(addr);
275 }
276 
277 static dma_addr_t ftmac100_rxdes_get_dma_addr(struct ftmac100_rxdes *rxdes)
278 {
279  return le32_to_cpu(rxdes->rxdes2);
280 }
281 
282 /*
283  * rxdes3 is not used by hardware. We use it to keep track of page.
284  * Since hardware does not touch it, we can skip cpu_to_le32()/le32_to_cpu().
285  */
286 static void ftmac100_rxdes_set_page(struct ftmac100_rxdes *rxdes, struct page *page)
287 {
288  rxdes->rxdes3 = (unsigned int)page;
289 }
290 
291 static struct page *ftmac100_rxdes_get_page(struct ftmac100_rxdes *rxdes)
292 {
293  return (struct page *)rxdes->rxdes3;
294 }
295 
296 /******************************************************************************
297  * internal functions (receive)
298  *****************************************************************************/
299 static int ftmac100_next_rx_pointer(int pointer)
300 {
301  return (pointer + 1) & (RX_QUEUE_ENTRIES - 1);
302 }
303 
304 static void ftmac100_rx_pointer_advance(struct ftmac100 *priv)
305 {
306  priv->rx_pointer = ftmac100_next_rx_pointer(priv->rx_pointer);
307 }
308 
309 static struct ftmac100_rxdes *ftmac100_current_rxdes(struct ftmac100 *priv)
310 {
311  return &priv->descs->rxdes[priv->rx_pointer];
312 }
313 
314 static struct ftmac100_rxdes *
315 ftmac100_rx_locate_first_segment(struct ftmac100 *priv)
316 {
317  struct ftmac100_rxdes *rxdes = ftmac100_current_rxdes(priv);
318 
319  while (!ftmac100_rxdes_owned_by_dma(rxdes)) {
320  if (ftmac100_rxdes_first_segment(rxdes))
321  return rxdes;
322 
323  ftmac100_rxdes_set_dma_own(rxdes);
324  ftmac100_rx_pointer_advance(priv);
325  rxdes = ftmac100_current_rxdes(priv);
326  }
327 
328  return NULL;
329 }
330 
331 static bool ftmac100_rx_packet_error(struct ftmac100 *priv,
332  struct ftmac100_rxdes *rxdes)
333 {
334  struct net_device *netdev = priv->netdev;
335  bool error = false;
336 
337  if (unlikely(ftmac100_rxdes_rx_error(rxdes))) {
338  if (net_ratelimit())
339  netdev_info(netdev, "rx err\n");
340 
341  netdev->stats.rx_errors++;
342  error = true;
343  }
344 
345  if (unlikely(ftmac100_rxdes_crc_error(rxdes))) {
346  if (net_ratelimit())
347  netdev_info(netdev, "rx crc err\n");
348 
349  netdev->stats.rx_crc_errors++;
350  error = true;
351  }
352 
353  if (unlikely(ftmac100_rxdes_frame_too_long(rxdes))) {
354  if (net_ratelimit())
355  netdev_info(netdev, "rx frame too long\n");
356 
357  netdev->stats.rx_length_errors++;
358  error = true;
359  } else if (unlikely(ftmac100_rxdes_runt(rxdes))) {
360  if (net_ratelimit())
361  netdev_info(netdev, "rx runt\n");
362 
363  netdev->stats.rx_length_errors++;
364  error = true;
365  } else if (unlikely(ftmac100_rxdes_odd_nibble(rxdes))) {
366  if (net_ratelimit())
367  netdev_info(netdev, "rx odd nibble\n");
368 
369  netdev->stats.rx_length_errors++;
370  error = true;
371  }
372 
373  return error;
374 }
375 
376 static void ftmac100_rx_drop_packet(struct ftmac100 *priv)
377 {
378  struct net_device *netdev = priv->netdev;
379  struct ftmac100_rxdes *rxdes = ftmac100_current_rxdes(priv);
380  bool done = false;
381 
382  if (net_ratelimit())
383  netdev_dbg(netdev, "drop packet %p\n", rxdes);
384 
385  do {
386  if (ftmac100_rxdes_last_segment(rxdes))
387  done = true;
388 
389  ftmac100_rxdes_set_dma_own(rxdes);
390  ftmac100_rx_pointer_advance(priv);
391  rxdes = ftmac100_current_rxdes(priv);
392  } while (!done && !ftmac100_rxdes_owned_by_dma(rxdes));
393 
394  netdev->stats.rx_dropped++;
395 }
396 
397 static bool ftmac100_rx_packet(struct ftmac100 *priv, int *processed)
398 {
399  struct net_device *netdev = priv->netdev;
400  struct ftmac100_rxdes *rxdes;
401  struct sk_buff *skb;
402  struct page *page;
403  dma_addr_t map;
404  int length;
405 
406  rxdes = ftmac100_rx_locate_first_segment(priv);
407  if (!rxdes)
408  return false;
409 
410  if (unlikely(ftmac100_rx_packet_error(priv, rxdes))) {
411  ftmac100_rx_drop_packet(priv);
412  return true;
413  }
414 
415  /*
416  * It is impossible to get multi-segment packets
417  * because we always provide big enough receive buffers.
418  */
419  if (unlikely(!ftmac100_rxdes_last_segment(rxdes)))
420  BUG();
421 
422  /* start processing */
423  skb = netdev_alloc_skb_ip_align(netdev, 128);
424  if (unlikely(!skb)) {
425  if (net_ratelimit())
426  netdev_err(netdev, "rx skb alloc failed\n");
427 
428  ftmac100_rx_drop_packet(priv);
429  return true;
430  }
431 
432  if (unlikely(ftmac100_rxdes_multicast(rxdes)))
433  netdev->stats.multicast++;
434 
435  map = ftmac100_rxdes_get_dma_addr(rxdes);
437 
438  length = ftmac100_rxdes_frame_length(rxdes);
439  page = ftmac100_rxdes_get_page(rxdes);
440  skb_fill_page_desc(skb, 0, page, 0, length);
441  skb->len += length;
442  skb->data_len += length;
443 
444  if (length > 128) {
445  skb->truesize += PAGE_SIZE;
446  /* We pull the minimum amount into linear part */
448  } else {
449  /* Small frames are copied into linear part to free one page */
450  __pskb_pull_tail(skb, length);
451  }
452  ftmac100_alloc_rx_page(priv, rxdes, GFP_ATOMIC);
453 
454  ftmac100_rx_pointer_advance(priv);
455 
456  skb->protocol = eth_type_trans(skb, netdev);
457 
458  netdev->stats.rx_packets++;
459  netdev->stats.rx_bytes += skb->len;
460 
461  /* push packet to protocol stack */
462  netif_receive_skb(skb);
463 
464  (*processed)++;
465  return true;
466 }
467 
468 /******************************************************************************
469  * internal functions (transmit descriptor)
470  *****************************************************************************/
471 static void ftmac100_txdes_reset(struct ftmac100_txdes *txdes)
472 {
473  /* clear all except end of ring bit */
474  txdes->txdes0 = 0;
476  txdes->txdes2 = 0;
477  txdes->txdes3 = 0;
478 }
479 
480 static bool ftmac100_txdes_owned_by_dma(struct ftmac100_txdes *txdes)
481 {
483 }
484 
485 static void ftmac100_txdes_set_dma_own(struct ftmac100_txdes *txdes)
486 {
487  /*
488  * Make sure dma own bit will not be set before any other
489  * descriptor fields.
490  */
491  wmb();
493 }
494 
495 static bool ftmac100_txdes_excessive_collision(struct ftmac100_txdes *txdes)
496 {
498 }
499 
500 static bool ftmac100_txdes_late_collision(struct ftmac100_txdes *txdes)
501 {
503 }
504 
505 static void ftmac100_txdes_set_end_of_ring(struct ftmac100_txdes *txdes)
506 {
508 }
509 
510 static void ftmac100_txdes_set_first_segment(struct ftmac100_txdes *txdes)
511 {
513 }
514 
515 static void ftmac100_txdes_set_last_segment(struct ftmac100_txdes *txdes)
516 {
518 }
519 
520 static void ftmac100_txdes_set_txint(struct ftmac100_txdes *txdes)
521 {
523 }
524 
525 static void ftmac100_txdes_set_buffer_size(struct ftmac100_txdes *txdes,
526  unsigned int len)
527 {
529 }
530 
531 static void ftmac100_txdes_set_dma_addr(struct ftmac100_txdes *txdes,
533 {
534  txdes->txdes2 = cpu_to_le32(addr);
535 }
536 
537 static dma_addr_t ftmac100_txdes_get_dma_addr(struct ftmac100_txdes *txdes)
538 {
539  return le32_to_cpu(txdes->txdes2);
540 }
541 
542 /*
543  * txdes3 is not used by hardware. We use it to keep track of socket buffer.
544  * Since hardware does not touch it, we can skip cpu_to_le32()/le32_to_cpu().
545  */
546 static void ftmac100_txdes_set_skb(struct ftmac100_txdes *txdes, struct sk_buff *skb)
547 {
548  txdes->txdes3 = (unsigned int)skb;
549 }
550 
551 static struct sk_buff *ftmac100_txdes_get_skb(struct ftmac100_txdes *txdes)
552 {
553  return (struct sk_buff *)txdes->txdes3;
554 }
555 
556 /******************************************************************************
557  * internal functions (transmit)
558  *****************************************************************************/
559 static int ftmac100_next_tx_pointer(int pointer)
560 {
561  return (pointer + 1) & (TX_QUEUE_ENTRIES - 1);
562 }
563 
564 static void ftmac100_tx_pointer_advance(struct ftmac100 *priv)
565 {
566  priv->tx_pointer = ftmac100_next_tx_pointer(priv->tx_pointer);
567 }
568 
569 static void ftmac100_tx_clean_pointer_advance(struct ftmac100 *priv)
570 {
571  priv->tx_clean_pointer = ftmac100_next_tx_pointer(priv->tx_clean_pointer);
572 }
573 
574 static struct ftmac100_txdes *ftmac100_current_txdes(struct ftmac100 *priv)
575 {
576  return &priv->descs->txdes[priv->tx_pointer];
577 }
578 
579 static struct ftmac100_txdes *ftmac100_current_clean_txdes(struct ftmac100 *priv)
580 {
581  return &priv->descs->txdes[priv->tx_clean_pointer];
582 }
583 
584 static bool ftmac100_tx_complete_packet(struct ftmac100 *priv)
585 {
586  struct net_device *netdev = priv->netdev;
587  struct ftmac100_txdes *txdes;
588  struct sk_buff *skb;
589  dma_addr_t map;
590 
591  if (priv->tx_pending == 0)
592  return false;
593 
594  txdes = ftmac100_current_clean_txdes(priv);
595 
596  if (ftmac100_txdes_owned_by_dma(txdes))
597  return false;
598 
599  skb = ftmac100_txdes_get_skb(txdes);
600  map = ftmac100_txdes_get_dma_addr(txdes);
601 
602  if (unlikely(ftmac100_txdes_excessive_collision(txdes) ||
603  ftmac100_txdes_late_collision(txdes))) {
604  /*
605  * packet transmitted to ethernet lost due to late collision
606  * or excessive collision
607  */
608  netdev->stats.tx_aborted_errors++;
609  } else {
610  netdev->stats.tx_packets++;
611  netdev->stats.tx_bytes += skb->len;
612  }
613 
614  dma_unmap_single(priv->dev, map, skb_headlen(skb), DMA_TO_DEVICE);
615  dev_kfree_skb(skb);
616 
617  ftmac100_txdes_reset(txdes);
618 
619  ftmac100_tx_clean_pointer_advance(priv);
620 
621  spin_lock(&priv->tx_lock);
622  priv->tx_pending--;
623  spin_unlock(&priv->tx_lock);
624  netif_wake_queue(netdev);
625 
626  return true;
627 }
628 
629 static void ftmac100_tx_complete(struct ftmac100 *priv)
630 {
631  while (ftmac100_tx_complete_packet(priv))
632  ;
633 }
634 
635 static int ftmac100_xmit(struct ftmac100 *priv, struct sk_buff *skb,
636  dma_addr_t map)
637 {
638  struct net_device *netdev = priv->netdev;
639  struct ftmac100_txdes *txdes;
640  unsigned int len = (skb->len < ETH_ZLEN) ? ETH_ZLEN : skb->len;
641 
642  txdes = ftmac100_current_txdes(priv);
643  ftmac100_tx_pointer_advance(priv);
644 
645  /* setup TX descriptor */
646  ftmac100_txdes_set_skb(txdes, skb);
647  ftmac100_txdes_set_dma_addr(txdes, map);
648 
649  ftmac100_txdes_set_first_segment(txdes);
650  ftmac100_txdes_set_last_segment(txdes);
651  ftmac100_txdes_set_txint(txdes);
652  ftmac100_txdes_set_buffer_size(txdes, len);
653 
654  spin_lock(&priv->tx_lock);
655  priv->tx_pending++;
656  if (priv->tx_pending == TX_QUEUE_ENTRIES)
657  netif_stop_queue(netdev);
658 
659  /* start transmit */
660  ftmac100_txdes_set_dma_own(txdes);
661  spin_unlock(&priv->tx_lock);
662 
663  ftmac100_txdma_start_polling(priv);
664  return NETDEV_TX_OK;
665 }
666 
667 /******************************************************************************
668  * internal functions (buffer)
669  *****************************************************************************/
670 static int ftmac100_alloc_rx_page(struct ftmac100 *priv,
671  struct ftmac100_rxdes *rxdes, gfp_t gfp)
672 {
673  struct net_device *netdev = priv->netdev;
674  struct page *page;
675  dma_addr_t map;
676 
677  page = alloc_page(gfp);
678  if (!page) {
679  if (net_ratelimit())
680  netdev_err(netdev, "failed to allocate rx page\n");
681  return -ENOMEM;
682  }
683 
684  map = dma_map_page(priv->dev, page, 0, RX_BUF_SIZE, DMA_FROM_DEVICE);
685  if (unlikely(dma_mapping_error(priv->dev, map))) {
686  if (net_ratelimit())
687  netdev_err(netdev, "failed to map rx page\n");
688  __free_page(page);
689  return -ENOMEM;
690  }
691 
692  ftmac100_rxdes_set_page(rxdes, page);
693  ftmac100_rxdes_set_dma_addr(rxdes, map);
694  ftmac100_rxdes_set_buffer_size(rxdes, RX_BUF_SIZE);
695  ftmac100_rxdes_set_dma_own(rxdes);
696  return 0;
697 }
698 
699 static void ftmac100_free_buffers(struct ftmac100 *priv)
700 {
701  int i;
702 
703  for (i = 0; i < RX_QUEUE_ENTRIES; i++) {
704  struct ftmac100_rxdes *rxdes = &priv->descs->rxdes[i];
705  struct page *page = ftmac100_rxdes_get_page(rxdes);
706  dma_addr_t map = ftmac100_rxdes_get_dma_addr(rxdes);
707 
708  if (!page)
709  continue;
710 
712  __free_page(page);
713  }
714 
715  for (i = 0; i < TX_QUEUE_ENTRIES; i++) {
716  struct ftmac100_txdes *txdes = &priv->descs->txdes[i];
717  struct sk_buff *skb = ftmac100_txdes_get_skb(txdes);
718  dma_addr_t map = ftmac100_txdes_get_dma_addr(txdes);
719 
720  if (!skb)
721  continue;
722 
723  dma_unmap_single(priv->dev, map, skb_headlen(skb), DMA_TO_DEVICE);
724  dev_kfree_skb(skb);
725  }
726 
727  dma_free_coherent(priv->dev, sizeof(struct ftmac100_descs),
728  priv->descs, priv->descs_dma_addr);
729 }
730 
731 static int ftmac100_alloc_buffers(struct ftmac100 *priv)
732 {
733  int i;
734 
735  priv->descs = dma_alloc_coherent(priv->dev, sizeof(struct ftmac100_descs),
736  &priv->descs_dma_addr, GFP_KERNEL);
737  if (!priv->descs)
738  return -ENOMEM;
739 
740  memset(priv->descs, 0, sizeof(struct ftmac100_descs));
741 
742  /* initialize RX ring */
743  ftmac100_rxdes_set_end_of_ring(&priv->descs->rxdes[RX_QUEUE_ENTRIES - 1]);
744 
745  for (i = 0; i < RX_QUEUE_ENTRIES; i++) {
746  struct ftmac100_rxdes *rxdes = &priv->descs->rxdes[i];
747 
748  if (ftmac100_alloc_rx_page(priv, rxdes, GFP_KERNEL))
749  goto err;
750  }
751 
752  /* initialize TX ring */
753  ftmac100_txdes_set_end_of_ring(&priv->descs->txdes[TX_QUEUE_ENTRIES - 1]);
754  return 0;
755 
756 err:
757  ftmac100_free_buffers(priv);
758  return -ENOMEM;
759 }
760 
761 /******************************************************************************
762  * struct mii_if_info functions
763  *****************************************************************************/
764 static int ftmac100_mdio_read(struct net_device *netdev, int phy_id, int reg)
765 {
766  struct ftmac100 *priv = netdev_priv(netdev);
767  unsigned int phycr;
768  int i;
769 
770  phycr = FTMAC100_PHYCR_PHYAD(phy_id) |
771  FTMAC100_PHYCR_REGAD(reg) |
773 
774  iowrite32(phycr, priv->base + FTMAC100_OFFSET_PHYCR);
775 
776  for (i = 0; i < 10; i++) {
777  phycr = ioread32(priv->base + FTMAC100_OFFSET_PHYCR);
778 
779  if ((phycr & FTMAC100_PHYCR_MIIRD) == 0)
780  return phycr & FTMAC100_PHYCR_MIIRDATA;
781 
782  udelay(100);
783  }
784 
785  netdev_err(netdev, "mdio read timed out\n");
786  return 0;
787 }
788 
789 static void ftmac100_mdio_write(struct net_device *netdev, int phy_id, int reg,
790  int data)
791 {
792  struct ftmac100 *priv = netdev_priv(netdev);
793  unsigned int phycr;
794  int i;
795 
796  phycr = FTMAC100_PHYCR_PHYAD(phy_id) |
797  FTMAC100_PHYCR_REGAD(reg) |
799 
800  data = FTMAC100_PHYWDATA_MIIWDATA(data);
801 
802  iowrite32(data, priv->base + FTMAC100_OFFSET_PHYWDATA);
803  iowrite32(phycr, priv->base + FTMAC100_OFFSET_PHYCR);
804 
805  for (i = 0; i < 10; i++) {
806  phycr = ioread32(priv->base + FTMAC100_OFFSET_PHYCR);
807 
808  if ((phycr & FTMAC100_PHYCR_MIIWR) == 0)
809  return;
810 
811  udelay(100);
812  }
813 
814  netdev_err(netdev, "mdio write timed out\n");
815 }
816 
817 /******************************************************************************
818  * struct ethtool_ops functions
819  *****************************************************************************/
820 static void ftmac100_get_drvinfo(struct net_device *netdev,
821  struct ethtool_drvinfo *info)
822 {
823  strcpy(info->driver, DRV_NAME);
824  strcpy(info->version, DRV_VERSION);
825  strcpy(info->bus_info, dev_name(&netdev->dev));
826 }
827 
828 static int ftmac100_get_settings(struct net_device *netdev, struct ethtool_cmd *cmd)
829 {
830  struct ftmac100 *priv = netdev_priv(netdev);
831  return mii_ethtool_gset(&priv->mii, cmd);
832 }
833 
834 static int ftmac100_set_settings(struct net_device *netdev, struct ethtool_cmd *cmd)
835 {
836  struct ftmac100 *priv = netdev_priv(netdev);
837  return mii_ethtool_sset(&priv->mii, cmd);
838 }
839 
840 static int ftmac100_nway_reset(struct net_device *netdev)
841 {
842  struct ftmac100 *priv = netdev_priv(netdev);
843  return mii_nway_restart(&priv->mii);
844 }
845 
846 static u32 ftmac100_get_link(struct net_device *netdev)
847 {
848  struct ftmac100 *priv = netdev_priv(netdev);
849  return mii_link_ok(&priv->mii);
850 }
851 
852 static const struct ethtool_ops ftmac100_ethtool_ops = {
853  .set_settings = ftmac100_set_settings,
854  .get_settings = ftmac100_get_settings,
855  .get_drvinfo = ftmac100_get_drvinfo,
856  .nway_reset = ftmac100_nway_reset,
857  .get_link = ftmac100_get_link,
858 };
859 
860 /******************************************************************************
861  * interrupt handler
862  *****************************************************************************/
863 static irqreturn_t ftmac100_interrupt(int irq, void *dev_id)
864 {
865  struct net_device *netdev = dev_id;
866  struct ftmac100 *priv = netdev_priv(netdev);
867 
868  if (likely(netif_running(netdev))) {
869  /* Disable interrupts for polling */
870  ftmac100_disable_all_int(priv);
871  napi_schedule(&priv->napi);
872  }
873 
874  return IRQ_HANDLED;
875 }
876 
877 /******************************************************************************
878  * struct napi_struct functions
879  *****************************************************************************/
880 static int ftmac100_poll(struct napi_struct *napi, int budget)
881 {
882  struct ftmac100 *priv = container_of(napi, struct ftmac100, napi);
883  struct net_device *netdev = priv->netdev;
884  unsigned int status;
885  bool completed = true;
886  int rx = 0;
887 
888  status = ioread32(priv->base + FTMAC100_OFFSET_ISR);
889 
891  /*
892  * FTMAC100_INT_RPKT_FINISH:
893  * RX DMA has received packets into RX buffer successfully
894  *
895  * FTMAC100_INT_NORXBUF:
896  * RX buffer unavailable
897  */
898  bool retry;
899 
900  do {
901  retry = ftmac100_rx_packet(priv, &rx);
902  } while (retry && rx < budget);
903 
904  if (retry && rx == budget)
905  completed = false;
906  }
907 
908  if (status & (FTMAC100_INT_XPKT_OK | FTMAC100_INT_XPKT_LOST)) {
909  /*
910  * FTMAC100_INT_XPKT_OK:
911  * packet transmitted to ethernet successfully
912  *
913  * FTMAC100_INT_XPKT_LOST:
914  * packet transmitted to ethernet lost due to late
915  * collision or excessive collision
916  */
917  ftmac100_tx_complete(priv);
918  }
919 
922  if (net_ratelimit())
923  netdev_info(netdev, "[ISR] = 0x%x: %s%s%s%s\n", status,
924  status & FTMAC100_INT_NORXBUF ? "NORXBUF " : "",
925  status & FTMAC100_INT_RPKT_LOST ? "RPKT_LOST " : "",
926  status & FTMAC100_INT_AHB_ERR ? "AHB_ERR " : "",
927  status & FTMAC100_INT_PHYSTS_CHG ? "PHYSTS_CHG" : "");
928 
929  if (status & FTMAC100_INT_NORXBUF) {
930  /* RX buffer unavailable */
931  netdev->stats.rx_over_errors++;
932  }
933 
934  if (status & FTMAC100_INT_RPKT_LOST) {
935  /* received packet lost due to RX FIFO full */
936  netdev->stats.rx_fifo_errors++;
937  }
938 
939  if (status & FTMAC100_INT_PHYSTS_CHG) {
940  /* PHY link status change */
941  mii_check_link(&priv->mii);
942  }
943  }
944 
945  if (completed) {
946  /* stop polling */
947  napi_complete(napi);
948  ftmac100_enable_all_int(priv);
949  }
950 
951  return rx;
952 }
953 
954 /******************************************************************************
955  * struct net_device_ops functions
956  *****************************************************************************/
957 static int ftmac100_open(struct net_device *netdev)
958 {
959  struct ftmac100 *priv = netdev_priv(netdev);
960  int err;
961 
962  err = ftmac100_alloc_buffers(priv);
963  if (err) {
964  netdev_err(netdev, "failed to allocate buffers\n");
965  goto err_alloc;
966  }
967 
968  err = request_irq(priv->irq, ftmac100_interrupt, 0, netdev->name, netdev);
969  if (err) {
970  netdev_err(netdev, "failed to request irq %d\n", priv->irq);
971  goto err_irq;
972  }
973 
974  priv->rx_pointer = 0;
975  priv->tx_clean_pointer = 0;
976  priv->tx_pointer = 0;
977  priv->tx_pending = 0;
978 
979  err = ftmac100_start_hw(priv);
980  if (err)
981  goto err_hw;
982 
983  napi_enable(&priv->napi);
984  netif_start_queue(netdev);
985 
986  ftmac100_enable_all_int(priv);
987 
988  return 0;
989 
990 err_hw:
991  free_irq(priv->irq, netdev);
992 err_irq:
993  ftmac100_free_buffers(priv);
994 err_alloc:
995  return err;
996 }
997 
998 static int ftmac100_stop(struct net_device *netdev)
999 {
1000  struct ftmac100 *priv = netdev_priv(netdev);
1001 
1002  ftmac100_disable_all_int(priv);
1003  netif_stop_queue(netdev);
1004  napi_disable(&priv->napi);
1005  ftmac100_stop_hw(priv);
1006  free_irq(priv->irq, netdev);
1007  ftmac100_free_buffers(priv);
1008 
1009  return 0;
1010 }
1011 
1012 static int ftmac100_hard_start_xmit(struct sk_buff *skb, struct net_device *netdev)
1013 {
1014  struct ftmac100 *priv = netdev_priv(netdev);
1015  dma_addr_t map;
1016 
1017  if (unlikely(skb->len > MAX_PKT_SIZE)) {
1018  if (net_ratelimit())
1019  netdev_dbg(netdev, "tx packet too big\n");
1020 
1021  netdev->stats.tx_dropped++;
1022  dev_kfree_skb(skb);
1023  return NETDEV_TX_OK;
1024  }
1025 
1026  map = dma_map_single(priv->dev, skb->data, skb_headlen(skb), DMA_TO_DEVICE);
1027  if (unlikely(dma_mapping_error(priv->dev, map))) {
1028  /* drop packet */
1029  if (net_ratelimit())
1030  netdev_err(netdev, "map socket buffer failed\n");
1031 
1032  netdev->stats.tx_dropped++;
1033  dev_kfree_skb(skb);
1034  return NETDEV_TX_OK;
1035  }
1036 
1037  return ftmac100_xmit(priv, skb, map);
1038 }
1039 
1040 /* optional */
1041 static int ftmac100_do_ioctl(struct net_device *netdev, struct ifreq *ifr, int cmd)
1042 {
1043  struct ftmac100 *priv = netdev_priv(netdev);
1044  struct mii_ioctl_data *data = if_mii(ifr);
1045 
1046  return generic_mii_ioctl(&priv->mii, data, cmd, NULL);
1047 }
1048 
1049 static const struct net_device_ops ftmac100_netdev_ops = {
1050  .ndo_open = ftmac100_open,
1051  .ndo_stop = ftmac100_stop,
1052  .ndo_start_xmit = ftmac100_hard_start_xmit,
1053  .ndo_set_mac_address = eth_mac_addr,
1054  .ndo_validate_addr = eth_validate_addr,
1055  .ndo_do_ioctl = ftmac100_do_ioctl,
1056 };
1057 
1058 /******************************************************************************
1059  * struct platform_driver functions
1060  *****************************************************************************/
1061 static int ftmac100_probe(struct platform_device *pdev)
1062 {
1063  struct resource *res;
1064  int irq;
1065  struct net_device *netdev;
1066  struct ftmac100 *priv;
1067  int err;
1068 
1069  if (!pdev)
1070  return -ENODEV;
1071 
1072  res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1073  if (!res)
1074  return -ENXIO;
1075 
1076  irq = platform_get_irq(pdev, 0);
1077  if (irq < 0)
1078  return irq;
1079 
1080  /* setup net_device */
1081  netdev = alloc_etherdev(sizeof(*priv));
1082  if (!netdev) {
1083  err = -ENOMEM;
1084  goto err_alloc_etherdev;
1085  }
1086 
1087  SET_NETDEV_DEV(netdev, &pdev->dev);
1088  SET_ETHTOOL_OPS(netdev, &ftmac100_ethtool_ops);
1089  netdev->netdev_ops = &ftmac100_netdev_ops;
1090 
1091  platform_set_drvdata(pdev, netdev);
1092 
1093  /* setup private data */
1094  priv = netdev_priv(netdev);
1095  priv->netdev = netdev;
1096  priv->dev = &pdev->dev;
1097 
1098  spin_lock_init(&priv->tx_lock);
1099 
1100  /* initialize NAPI */
1101  netif_napi_add(netdev, &priv->napi, ftmac100_poll, 64);
1102 
1103  /* map io memory */
1104  priv->res = request_mem_region(res->start, resource_size(res),
1105  dev_name(&pdev->dev));
1106  if (!priv->res) {
1107  dev_err(&pdev->dev, "Could not reserve memory region\n");
1108  err = -ENOMEM;
1109  goto err_req_mem;
1110  }
1111 
1112  priv->base = ioremap(res->start, resource_size(res));
1113  if (!priv->base) {
1114  dev_err(&pdev->dev, "Failed to ioremap ethernet registers\n");
1115  err = -EIO;
1116  goto err_ioremap;
1117  }
1118 
1119  priv->irq = irq;
1120 
1121  /* initialize struct mii_if_info */
1122  priv->mii.phy_id = 0;
1123  priv->mii.phy_id_mask = 0x1f;
1124  priv->mii.reg_num_mask = 0x1f;
1125  priv->mii.dev = netdev;
1126  priv->mii.mdio_read = ftmac100_mdio_read;
1127  priv->mii.mdio_write = ftmac100_mdio_write;
1128 
1129  /* register network device */
1130  err = register_netdev(netdev);
1131  if (err) {
1132  dev_err(&pdev->dev, "Failed to register netdev\n");
1133  goto err_register_netdev;
1134  }
1135 
1136  netdev_info(netdev, "irq %d, mapped at %p\n", priv->irq, priv->base);
1137 
1138  if (!is_valid_ether_addr(netdev->dev_addr)) {
1139  eth_hw_addr_random(netdev);
1140  netdev_info(netdev, "generated random MAC address %pM\n",
1141  netdev->dev_addr);
1142  }
1143 
1144  return 0;
1145 
1146 err_register_netdev:
1147  iounmap(priv->base);
1148 err_ioremap:
1149  release_resource(priv->res);
1150 err_req_mem:
1151  netif_napi_del(&priv->napi);
1152  platform_set_drvdata(pdev, NULL);
1153  free_netdev(netdev);
1154 err_alloc_etherdev:
1155  return err;
1156 }
1157 
1158 static int __exit ftmac100_remove(struct platform_device *pdev)
1159 {
1160  struct net_device *netdev;
1161  struct ftmac100 *priv;
1162 
1163  netdev = platform_get_drvdata(pdev);
1164  priv = netdev_priv(netdev);
1165 
1166  unregister_netdev(netdev);
1167 
1168  iounmap(priv->base);
1169  release_resource(priv->res);
1170 
1171  netif_napi_del(&priv->napi);
1172  platform_set_drvdata(pdev, NULL);
1173  free_netdev(netdev);
1174  return 0;
1175 }
1176 
1177 static struct platform_driver ftmac100_driver = {
1178  .probe = ftmac100_probe,
1179  .remove = __exit_p(ftmac100_remove),
1180  .driver = {
1181  .name = DRV_NAME,
1182  .owner = THIS_MODULE,
1183  },
1184 };
1185 
1186 /******************************************************************************
1187  * initialization / finalization
1188  *****************************************************************************/
1189 static int __init ftmac100_init(void)
1190 {
1191  pr_info("Loading version " DRV_VERSION " ...\n");
1192  return platform_driver_register(&ftmac100_driver);
1193 }
1194 
1195 static void __exit ftmac100_exit(void)
1196 {
1197  platform_driver_unregister(&ftmac100_driver);
1198 }
1199 
1200 module_init(ftmac100_init);
1201 module_exit(ftmac100_exit);
1202 
1203 MODULE_AUTHOR("Po-Yu Chuang <[email protected]>");
1204 MODULE_DESCRIPTION("FTMAC100 driver");
1205 MODULE_LICENSE("GPL");