Version:  2.0.40 2.2.26 2.4.37 3.1 3.2 3.3 3.4 3.5 3.6 3.7 3.8 3.9 3.10 3.11 3.12 3.13 3.14 3.15 3.16 3.17

Linux/drivers/net/ethernet/faraday/ftmac100.c

  1 /*
  2  * Faraday FTMAC100 10/100 Ethernet
  3  *
  4  * (C) Copyright 2009-2011 Faraday Technology
  5  * Po-Yu Chuang <ratbert@faraday-tech.com>
  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  *****************************************************************************/
 57 struct ftmac100_descs {
 58         struct ftmac100_rxdes rxdes[RX_QUEUE_ENTRIES];
 59         struct ftmac100_txdes txdes[TX_QUEUE_ENTRIES];
 60 };
 61 
 62 struct ftmac100 {
 63         struct resource *res;
 64         void __iomem *base;
 65         int irq;
 66 
 67         struct ftmac100_descs *descs;
 68         dma_addr_t descs_dma_addr;
 69 
 70         unsigned int rx_pointer;
 71         unsigned int tx_clean_pointer;
 72         unsigned int tx_pointer;
 73         unsigned int tx_pending;
 74 
 75         spinlock_t tx_lock;
 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 {
102         iowrite32(INT_MASK_ALL_ENABLED, priv->base + FTMAC100_OFFSET_IMR);
103 }
104 
105 static void ftmac100_disable_all_int(struct ftmac100 *priv)
106 {
107         iowrite32(INT_MASK_ALL_DISABLED, priv->base + FTMAC100_OFFSET_IMR);
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 */
131         iowrite32(FTMAC100_MACCR_SW_RST, priv->base + FTMAC100_OFFSET_MACCR);
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 
187         iowrite32(FTMAC100_APTC_RXPOLL_CNT(1), priv->base + FTMAC100_OFFSET_APTC);
188 
189         ftmac100_set_mac(priv, netdev->dev_addr);
190 
191         iowrite32(MACCR_ENABLE_ALL, priv->base + FTMAC100_OFFSET_MACCR);
192         return 0;
193 }
194 
195 static void ftmac100_stop_hw(struct ftmac100 *priv)
196 {
197         iowrite32(0, priv->base + FTMAC100_OFFSET_MACCR);
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 {
215         return rxdes->rxdes0 & cpu_to_le32(FTMAC100_RXDES0_RXDMA_OWN);
216 }
217 
218 static void ftmac100_rxdes_set_dma_own(struct ftmac100_rxdes *rxdes)
219 {
220         /* clear status bits */
221         rxdes->rxdes0 = cpu_to_le32(FTMAC100_RXDES0_RXDMA_OWN);
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 {
246         return rxdes->rxdes0 & cpu_to_le32(FTMAC100_RXDES0_RX_ODD_NB);
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 {
256         return rxdes->rxdes0 & cpu_to_le32(FTMAC100_RXDES0_MULTICAST);
257 }
258 
259 static void ftmac100_rxdes_set_buffer_size(struct ftmac100_rxdes *rxdes,
260                                            unsigned int size)
261 {
262         rxdes->rxdes1 &= cpu_to_le32(FTMAC100_RXDES1_EDORR);
263         rxdes->rxdes1 |= cpu_to_le32(FTMAC100_RXDES1_RXBUF_SIZE(size));
264 }
265 
266 static void ftmac100_rxdes_set_end_of_ring(struct ftmac100_rxdes *rxdes)
267 {
268         rxdes->rxdes1 |= cpu_to_le32(FTMAC100_RXDES1_EDORR);
269 }
270 
271 static void ftmac100_rxdes_set_dma_addr(struct ftmac100_rxdes *rxdes,
272                                         dma_addr_t addr)
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);
436         dma_unmap_page(priv->dev, map, RX_BUF_SIZE, DMA_FROM_DEVICE);
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 */
447                 __pskb_pull_tail(skb, ETH_HLEN);
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;
475         txdes->txdes1 &= cpu_to_le32(FTMAC100_TXDES1_EDOTR);
476         txdes->txdes2 = 0;
477         txdes->txdes3 = 0;
478 }
479 
480 static bool ftmac100_txdes_owned_by_dma(struct ftmac100_txdes *txdes)
481 {
482         return txdes->txdes0 & cpu_to_le32(FTMAC100_TXDES0_TXDMA_OWN);
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();
492         txdes->txdes0 |= cpu_to_le32(FTMAC100_TXDES0_TXDMA_OWN);
493 }
494 
495 static bool ftmac100_txdes_excessive_collision(struct ftmac100_txdes *txdes)
496 {
497         return txdes->txdes0 & cpu_to_le32(FTMAC100_TXDES0_TXPKT_EXSCOL);
498 }
499 
500 static bool ftmac100_txdes_late_collision(struct ftmac100_txdes *txdes)
501 {
502         return txdes->txdes0 & cpu_to_le32(FTMAC100_TXDES0_TXPKT_LATECOL);
503 }
504 
505 static void ftmac100_txdes_set_end_of_ring(struct ftmac100_txdes *txdes)
506 {
507         txdes->txdes1 |= cpu_to_le32(FTMAC100_TXDES1_EDOTR);
508 }
509 
510 static void ftmac100_txdes_set_first_segment(struct ftmac100_txdes *txdes)
511 {
512         txdes->txdes1 |= cpu_to_le32(FTMAC100_TXDES1_FTS);
513 }
514 
515 static void ftmac100_txdes_set_last_segment(struct ftmac100_txdes *txdes)
516 {
517         txdes->txdes1 |= cpu_to_le32(FTMAC100_TXDES1_LTS);
518 }
519 
520 static void ftmac100_txdes_set_txint(struct ftmac100_txdes *txdes)
521 {
522         txdes->txdes1 |= cpu_to_le32(FTMAC100_TXDES1_TXIC);
523 }
524 
525 static void ftmac100_txdes_set_buffer_size(struct ftmac100_txdes *txdes,
526                                            unsigned int len)
527 {
528         txdes->txdes1 |= cpu_to_le32(FTMAC100_TXDES1_TXBUF_SIZE(len));
529 }
530 
531 static void ftmac100_txdes_set_dma_addr(struct ftmac100_txdes *txdes,
532                                         dma_addr_t addr)
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 
711                 dma_unmap_page(priv->dev, map, RX_BUF_SIZE, DMA_FROM_DEVICE);
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_zalloc_coherent(priv->dev,
736                                           sizeof(struct ftmac100_descs),
737                                           &priv->descs_dma_addr,
738                                           GFP_KERNEL);
739         if (!priv->descs)
740                 return -ENOMEM;
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) |
772                 FTMAC100_PHYCR_MIIRD;
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) |
798                 FTMAC100_PHYCR_MIIWR;
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         strlcpy(info->driver, DRV_NAME, sizeof(info->driver));
824         strlcpy(info->version, DRV_VERSION, sizeof(info->version));
825         strlcpy(info->bus_info, dev_name(&netdev->dev), sizeof(info->bus_info));
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 
890         if (status & (FTMAC100_INT_RPKT_FINISH | FTMAC100_INT_NORXBUF)) {
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 
920         if (status & (FTMAC100_INT_NORXBUF | FTMAC100_INT_RPKT_LOST |
921                       FTMAC100_INT_AHB_ERR | FTMAC100_INT_PHYSTS_CHG)) {
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         netdev->ethtool_ops = &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         free_netdev(netdev);
1153 err_alloc_etherdev:
1154         return err;
1155 }
1156 
1157 static int __exit ftmac100_remove(struct platform_device *pdev)
1158 {
1159         struct net_device *netdev;
1160         struct ftmac100 *priv;
1161 
1162         netdev = platform_get_drvdata(pdev);
1163         priv = netdev_priv(netdev);
1164 
1165         unregister_netdev(netdev);
1166 
1167         iounmap(priv->base);
1168         release_resource(priv->res);
1169 
1170         netif_napi_del(&priv->napi);
1171         free_netdev(netdev);
1172         return 0;
1173 }
1174 
1175 static struct platform_driver ftmac100_driver = {
1176         .probe          = ftmac100_probe,
1177         .remove         = __exit_p(ftmac100_remove),
1178         .driver         = {
1179                 .name   = DRV_NAME,
1180                 .owner  = THIS_MODULE,
1181         },
1182 };
1183 
1184 /******************************************************************************
1185  * initialization / finalization
1186  *****************************************************************************/
1187 static int __init ftmac100_init(void)
1188 {
1189         pr_info("Loading version " DRV_VERSION " ...\n");
1190         return platform_driver_register(&ftmac100_driver);
1191 }
1192 
1193 static void __exit ftmac100_exit(void)
1194 {
1195         platform_driver_unregister(&ftmac100_driver);
1196 }
1197 
1198 module_init(ftmac100_init);
1199 module_exit(ftmac100_exit);
1200 
1201 MODULE_AUTHOR("Po-Yu Chuang <ratbert@faraday-tech.com>");
1202 MODULE_DESCRIPTION("FTMAC100 driver");
1203 MODULE_LICENSE("GPL");
1204 

This page was automatically generated by LXR 0.3.1 (source).  •  Linux is a registered trademark of Linus Torvalds  •  Contact us