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greth.c
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1 /*
2  * Aeroflex Gaisler GRETH 10/100/1G Ethernet MAC.
3  *
4  * 2005-2010 (c) Aeroflex Gaisler AB
5  *
6  * This driver supports GRETH 10/100 and GRETH 10/100/1G Ethernet MACs
7  * available in the GRLIB VHDL IP core library.
8  *
9  * Full documentation of both cores can be found here:
10  * http://www.gaisler.com/products/grlib/grip.pdf
11  *
12  * The Gigabit version supports scatter/gather DMA, any alignment of
13  * buffers and checksum offloading.
14  *
15  * This program is free software; you can redistribute it and/or modify it
16  * under the terms of the GNU General Public License as published by the
17  * Free Software Foundation; either version 2 of the License, or (at your
18  * option) any later version.
19  *
20  * Contributors: Kristoffer Glembo
21  * Daniel Hellstrom
22  * Marko Isomaki
23  */
24 
25 #include <linux/dma-mapping.h>
26 #include <linux/module.h>
27 #include <linux/uaccess.h>
28 #include <linux/init.h>
29 #include <linux/interrupt.h>
30 #include <linux/netdevice.h>
31 #include <linux/etherdevice.h>
32 #include <linux/ethtool.h>
33 #include <linux/skbuff.h>
34 #include <linux/io.h>
35 #include <linux/crc32.h>
36 #include <linux/mii.h>
37 #include <linux/of_device.h>
38 #include <linux/of_platform.h>
39 #include <linux/slab.h>
40 #include <asm/cacheflush.h>
41 #include <asm/byteorder.h>
42 
43 #ifdef CONFIG_SPARC
44 #include <asm/idprom.h>
45 #endif
46 
47 #include "greth.h"
48 
49 #define GRETH_DEF_MSG_ENABLE \
50  (NETIF_MSG_DRV | \
51  NETIF_MSG_PROBE | \
52  NETIF_MSG_LINK | \
53  NETIF_MSG_IFDOWN | \
54  NETIF_MSG_IFUP | \
55  NETIF_MSG_RX_ERR | \
56  NETIF_MSG_TX_ERR)
57 
58 static int greth_debug = -1; /* -1 == use GRETH_DEF_MSG_ENABLE as value */
59 module_param(greth_debug, int, 0);
60 MODULE_PARM_DESC(greth_debug, "GRETH bitmapped debugging message enable value");
61 
62 /* Accept MAC address of the form macaddr=0x08,0x00,0x20,0x30,0x40,0x50 */
63 static int macaddr[6];
64 module_param_array(macaddr, int, NULL, 0);
65 MODULE_PARM_DESC(macaddr, "GRETH Ethernet MAC address");
66 
67 static int greth_edcl = 1;
68 module_param(greth_edcl, int, 0);
69 MODULE_PARM_DESC(greth_edcl, "GRETH EDCL usage indicator. Set to 1 if EDCL is used.");
70 
71 static int greth_open(struct net_device *dev);
72 static netdev_tx_t greth_start_xmit(struct sk_buff *skb,
73  struct net_device *dev);
74 static netdev_tx_t greth_start_xmit_gbit(struct sk_buff *skb,
75  struct net_device *dev);
76 static int greth_rx(struct net_device *dev, int limit);
77 static int greth_rx_gbit(struct net_device *dev, int limit);
78 static void greth_clean_tx(struct net_device *dev);
79 static void greth_clean_tx_gbit(struct net_device *dev);
80 static irqreturn_t greth_interrupt(int irq, void *dev_id);
81 static int greth_close(struct net_device *dev);
82 static int greth_set_mac_add(struct net_device *dev, void *p);
83 static void greth_set_multicast_list(struct net_device *dev);
84 
85 #define GRETH_REGLOAD(a) (be32_to_cpu(__raw_readl(&(a))))
86 #define GRETH_REGSAVE(a, v) (__raw_writel(cpu_to_be32(v), &(a)))
87 #define GRETH_REGORIN(a, v) (GRETH_REGSAVE(a, (GRETH_REGLOAD(a) | (v))))
88 #define GRETH_REGANDIN(a, v) (GRETH_REGSAVE(a, (GRETH_REGLOAD(a) & (v))))
89 
90 #define NEXT_TX(N) (((N) + 1) & GRETH_TXBD_NUM_MASK)
91 #define SKIP_TX(N, C) (((N) + C) & GRETH_TXBD_NUM_MASK)
92 #define NEXT_RX(N) (((N) + 1) & GRETH_RXBD_NUM_MASK)
93 
94 static void greth_print_rx_packet(void *addr, int len)
95 {
96  print_hex_dump(KERN_DEBUG, "RX: ", DUMP_PREFIX_OFFSET, 16, 1,
97  addr, len, true);
98 }
99 
100 static void greth_print_tx_packet(struct sk_buff *skb)
101 {
102  int i;
103  int length;
104 
105  if (skb_shinfo(skb)->nr_frags == 0)
106  length = skb->len;
107  else
108  length = skb_headlen(skb);
109 
110  print_hex_dump(KERN_DEBUG, "TX: ", DUMP_PREFIX_OFFSET, 16, 1,
111  skb->data, length, true);
112 
113  for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) {
114 
115  print_hex_dump(KERN_DEBUG, "TX: ", DUMP_PREFIX_OFFSET, 16, 1,
116  skb_frag_address(&skb_shinfo(skb)->frags[i]),
117  skb_shinfo(skb)->frags[i].size, true);
118  }
119 }
120 
121 static inline void greth_enable_tx(struct greth_private *greth)
122 {
123  wmb();
124  GRETH_REGORIN(greth->regs->control, GRETH_TXEN);
125 }
126 
127 static inline void greth_disable_tx(struct greth_private *greth)
128 {
129  GRETH_REGANDIN(greth->regs->control, ~GRETH_TXEN);
130 }
131 
132 static inline void greth_enable_rx(struct greth_private *greth)
133 {
134  wmb();
135  GRETH_REGORIN(greth->regs->control, GRETH_RXEN);
136 }
137 
138 static inline void greth_disable_rx(struct greth_private *greth)
139 {
140  GRETH_REGANDIN(greth->regs->control, ~GRETH_RXEN);
141 }
142 
143 static inline void greth_enable_irqs(struct greth_private *greth)
144 {
145  GRETH_REGORIN(greth->regs->control, GRETH_RXI | GRETH_TXI);
146 }
147 
148 static inline void greth_disable_irqs(struct greth_private *greth)
149 {
150  GRETH_REGANDIN(greth->regs->control, ~(GRETH_RXI|GRETH_TXI));
151 }
152 
153 static inline void greth_write_bd(u32 *bd, u32 val)
154 {
155  __raw_writel(cpu_to_be32(val), bd);
156 }
157 
158 static inline u32 greth_read_bd(u32 *bd)
159 {
160  return be32_to_cpu(__raw_readl(bd));
161 }
162 
163 static void greth_clean_rings(struct greth_private *greth)
164 {
165  int i;
166  struct greth_bd *rx_bdp = greth->rx_bd_base;
167  struct greth_bd *tx_bdp = greth->tx_bd_base;
168 
169  if (greth->gbit_mac) {
170 
171  /* Free and unmap RX buffers */
172  for (i = 0; i < GRETH_RXBD_NUM; i++, rx_bdp++) {
173  if (greth->rx_skbuff[i] != NULL) {
174  dev_kfree_skb(greth->rx_skbuff[i]);
175  dma_unmap_single(greth->dev,
176  greth_read_bd(&rx_bdp->addr),
177  MAX_FRAME_SIZE+NET_IP_ALIGN,
178  DMA_FROM_DEVICE);
179  }
180  }
181 
182  /* TX buffers */
183  while (greth->tx_free < GRETH_TXBD_NUM) {
184 
185  struct sk_buff *skb = greth->tx_skbuff[greth->tx_last];
186  int nr_frags = skb_shinfo(skb)->nr_frags;
187  tx_bdp = greth->tx_bd_base + greth->tx_last;
188  greth->tx_last = NEXT_TX(greth->tx_last);
189 
190  dma_unmap_single(greth->dev,
191  greth_read_bd(&tx_bdp->addr),
192  skb_headlen(skb),
193  DMA_TO_DEVICE);
194 
195  for (i = 0; i < nr_frags; i++) {
196  skb_frag_t *frag = &skb_shinfo(skb)->frags[i];
197  tx_bdp = greth->tx_bd_base + greth->tx_last;
198 
199  dma_unmap_page(greth->dev,
200  greth_read_bd(&tx_bdp->addr),
201  skb_frag_size(frag),
202  DMA_TO_DEVICE);
203 
204  greth->tx_last = NEXT_TX(greth->tx_last);
205  }
206  greth->tx_free += nr_frags+1;
207  dev_kfree_skb(skb);
208  }
209 
210 
211  } else { /* 10/100 Mbps MAC */
212 
213  for (i = 0; i < GRETH_RXBD_NUM; i++, rx_bdp++) {
214  kfree(greth->rx_bufs[i]);
215  dma_unmap_single(greth->dev,
216  greth_read_bd(&rx_bdp->addr),
217  MAX_FRAME_SIZE,
218  DMA_FROM_DEVICE);
219  }
220  for (i = 0; i < GRETH_TXBD_NUM; i++, tx_bdp++) {
221  kfree(greth->tx_bufs[i]);
222  dma_unmap_single(greth->dev,
223  greth_read_bd(&tx_bdp->addr),
224  MAX_FRAME_SIZE,
225  DMA_TO_DEVICE);
226  }
227  }
228 }
229 
230 static int greth_init_rings(struct greth_private *greth)
231 {
232  struct sk_buff *skb;
233  struct greth_bd *rx_bd, *tx_bd;
234  u32 dma_addr;
235  int i;
236 
237  rx_bd = greth->rx_bd_base;
238  tx_bd = greth->tx_bd_base;
239 
240  /* Initialize descriptor rings and buffers */
241  if (greth->gbit_mac) {
242 
243  for (i = 0; i < GRETH_RXBD_NUM; i++) {
244  skb = netdev_alloc_skb(greth->netdev, MAX_FRAME_SIZE+NET_IP_ALIGN);
245  if (skb == NULL) {
246  if (netif_msg_ifup(greth))
247  dev_err(greth->dev, "Error allocating DMA ring.\n");
248  goto cleanup;
249  }
250  skb_reserve(skb, NET_IP_ALIGN);
251  dma_addr = dma_map_single(greth->dev,
252  skb->data,
253  MAX_FRAME_SIZE+NET_IP_ALIGN,
254  DMA_FROM_DEVICE);
255 
256  if (dma_mapping_error(greth->dev, dma_addr)) {
257  if (netif_msg_ifup(greth))
258  dev_err(greth->dev, "Could not create initial DMA mapping\n");
259  goto cleanup;
260  }
261  greth->rx_skbuff[i] = skb;
262  greth_write_bd(&rx_bd[i].addr, dma_addr);
263  greth_write_bd(&rx_bd[i].stat, GRETH_BD_EN | GRETH_BD_IE);
264  }
265 
266  } else {
267 
268  /* 10/100 MAC uses a fixed set of buffers and copy to/from SKBs */
269  for (i = 0; i < GRETH_RXBD_NUM; i++) {
270 
271  greth->rx_bufs[i] = kmalloc(MAX_FRAME_SIZE, GFP_KERNEL);
272 
273  if (greth->rx_bufs[i] == NULL) {
274  if (netif_msg_ifup(greth))
275  dev_err(greth->dev, "Error allocating DMA ring.\n");
276  goto cleanup;
277  }
278 
279  dma_addr = dma_map_single(greth->dev,
280  greth->rx_bufs[i],
281  MAX_FRAME_SIZE,
282  DMA_FROM_DEVICE);
283 
284  if (dma_mapping_error(greth->dev, dma_addr)) {
285  if (netif_msg_ifup(greth))
286  dev_err(greth->dev, "Could not create initial DMA mapping\n");
287  goto cleanup;
288  }
289  greth_write_bd(&rx_bd[i].addr, dma_addr);
290  greth_write_bd(&rx_bd[i].stat, GRETH_BD_EN | GRETH_BD_IE);
291  }
292  for (i = 0; i < GRETH_TXBD_NUM; i++) {
293 
294  greth->tx_bufs[i] = kmalloc(MAX_FRAME_SIZE, GFP_KERNEL);
295 
296  if (greth->tx_bufs[i] == NULL) {
297  if (netif_msg_ifup(greth))
298  dev_err(greth->dev, "Error allocating DMA ring.\n");
299  goto cleanup;
300  }
301 
302  dma_addr = dma_map_single(greth->dev,
303  greth->tx_bufs[i],
304  MAX_FRAME_SIZE,
305  DMA_TO_DEVICE);
306 
307  if (dma_mapping_error(greth->dev, dma_addr)) {
308  if (netif_msg_ifup(greth))
309  dev_err(greth->dev, "Could not create initial DMA mapping\n");
310  goto cleanup;
311  }
312  greth_write_bd(&tx_bd[i].addr, dma_addr);
313  greth_write_bd(&tx_bd[i].stat, 0);
314  }
315  }
316  greth_write_bd(&rx_bd[GRETH_RXBD_NUM - 1].stat,
317  greth_read_bd(&rx_bd[GRETH_RXBD_NUM - 1].stat) | GRETH_BD_WR);
318 
319  /* Initialize pointers. */
320  greth->rx_cur = 0;
321  greth->tx_next = 0;
322  greth->tx_last = 0;
323  greth->tx_free = GRETH_TXBD_NUM;
324 
325  /* Initialize descriptor base address */
326  GRETH_REGSAVE(greth->regs->tx_desc_p, greth->tx_bd_base_phys);
327  GRETH_REGSAVE(greth->regs->rx_desc_p, greth->rx_bd_base_phys);
328 
329  return 0;
330 
331 cleanup:
332  greth_clean_rings(greth);
333  return -ENOMEM;
334 }
335 
336 static int greth_open(struct net_device *dev)
337 {
338  struct greth_private *greth = netdev_priv(dev);
339  int err;
340 
341  err = greth_init_rings(greth);
342  if (err) {
343  if (netif_msg_ifup(greth))
344  dev_err(&dev->dev, "Could not allocate memory for DMA rings\n");
345  return err;
346  }
347 
348  err = request_irq(greth->irq, greth_interrupt, 0, "eth", (void *) dev);
349  if (err) {
350  if (netif_msg_ifup(greth))
351  dev_err(&dev->dev, "Could not allocate interrupt %d\n", dev->irq);
352  greth_clean_rings(greth);
353  return err;
354  }
355 
356  if (netif_msg_ifup(greth))
357  dev_dbg(&dev->dev, " starting queue\n");
358  netif_start_queue(dev);
359 
360  GRETH_REGSAVE(greth->regs->status, 0xFF);
361 
362  napi_enable(&greth->napi);
363 
364  greth_enable_irqs(greth);
365  greth_enable_tx(greth);
366  greth_enable_rx(greth);
367  return 0;
368 
369 }
370 
371 static int greth_close(struct net_device *dev)
372 {
373  struct greth_private *greth = netdev_priv(dev);
374 
375  napi_disable(&greth->napi);
376 
377  greth_disable_irqs(greth);
378  greth_disable_tx(greth);
379  greth_disable_rx(greth);
380 
381  netif_stop_queue(dev);
382 
383  free_irq(greth->irq, (void *) dev);
384 
385  greth_clean_rings(greth);
386 
387  return 0;
388 }
389 
390 static netdev_tx_t
391 greth_start_xmit(struct sk_buff *skb, struct net_device *dev)
392 {
393  struct greth_private *greth = netdev_priv(dev);
394  struct greth_bd *bdp;
395  int err = NETDEV_TX_OK;
396  u32 status, dma_addr, ctrl;
397  unsigned long flags;
398 
399  /* Clean TX Ring */
400  greth_clean_tx(greth->netdev);
401 
402  if (unlikely(greth->tx_free <= 0)) {
403  spin_lock_irqsave(&greth->devlock, flags);/*save from poll/irq*/
404  ctrl = GRETH_REGLOAD(greth->regs->control);
405  /* Enable TX IRQ only if not already in poll() routine */
406  if (ctrl & GRETH_RXI)
407  GRETH_REGSAVE(greth->regs->control, ctrl | GRETH_TXI);
408  netif_stop_queue(dev);
409  spin_unlock_irqrestore(&greth->devlock, flags);
410  return NETDEV_TX_BUSY;
411  }
412 
413  if (netif_msg_pktdata(greth))
414  greth_print_tx_packet(skb);
415 
416 
417  if (unlikely(skb->len > MAX_FRAME_SIZE)) {
418  dev->stats.tx_errors++;
419  goto out;
420  }
421 
422  bdp = greth->tx_bd_base + greth->tx_next;
423  dma_addr = greth_read_bd(&bdp->addr);
424 
425  memcpy((unsigned char *) phys_to_virt(dma_addr), skb->data, skb->len);
426 
427  dma_sync_single_for_device(greth->dev, dma_addr, skb->len, DMA_TO_DEVICE);
428 
429  status = GRETH_BD_EN | GRETH_BD_IE | (skb->len & GRETH_BD_LEN);
430  greth->tx_bufs_length[greth->tx_next] = skb->len & GRETH_BD_LEN;
431 
432  /* Wrap around descriptor ring */
433  if (greth->tx_next == GRETH_TXBD_NUM_MASK) {
434  status |= GRETH_BD_WR;
435  }
436 
437  greth->tx_next = NEXT_TX(greth->tx_next);
438  greth->tx_free--;
439 
440  /* Write descriptor control word and enable transmission */
441  greth_write_bd(&bdp->stat, status);
442  spin_lock_irqsave(&greth->devlock, flags); /*save from poll/irq*/
443  greth_enable_tx(greth);
444  spin_unlock_irqrestore(&greth->devlock, flags);
445 
446 out:
447  dev_kfree_skb(skb);
448  return err;
449 }
450 
451 
452 static netdev_tx_t
453 greth_start_xmit_gbit(struct sk_buff *skb, struct net_device *dev)
454 {
455  struct greth_private *greth = netdev_priv(dev);
456  struct greth_bd *bdp;
457  u32 status = 0, dma_addr, ctrl;
458  int curr_tx, nr_frags, i, err = NETDEV_TX_OK;
459  unsigned long flags;
460 
461  nr_frags = skb_shinfo(skb)->nr_frags;
462 
463  /* Clean TX Ring */
464  greth_clean_tx_gbit(dev);
465 
466  if (greth->tx_free < nr_frags + 1) {
467  spin_lock_irqsave(&greth->devlock, flags);/*save from poll/irq*/
468  ctrl = GRETH_REGLOAD(greth->regs->control);
469  /* Enable TX IRQ only if not already in poll() routine */
470  if (ctrl & GRETH_RXI)
471  GRETH_REGSAVE(greth->regs->control, ctrl | GRETH_TXI);
472  netif_stop_queue(dev);
473  spin_unlock_irqrestore(&greth->devlock, flags);
474  err = NETDEV_TX_BUSY;
475  goto out;
476  }
477 
478  if (netif_msg_pktdata(greth))
479  greth_print_tx_packet(skb);
480 
481  if (unlikely(skb->len > MAX_FRAME_SIZE)) {
482  dev->stats.tx_errors++;
483  goto out;
484  }
485 
486  /* Save skb pointer. */
487  greth->tx_skbuff[greth->tx_next] = skb;
488 
489  /* Linear buf */
490  if (nr_frags != 0)
491  status = GRETH_TXBD_MORE;
492 
493  if (skb->ip_summed == CHECKSUM_PARTIAL)
494  status |= GRETH_TXBD_CSALL;
495  status |= skb_headlen(skb) & GRETH_BD_LEN;
496  if (greth->tx_next == GRETH_TXBD_NUM_MASK)
497  status |= GRETH_BD_WR;
498 
499 
500  bdp = greth->tx_bd_base + greth->tx_next;
501  greth_write_bd(&bdp->stat, status);
502  dma_addr = dma_map_single(greth->dev, skb->data, skb_headlen(skb), DMA_TO_DEVICE);
503 
504  if (unlikely(dma_mapping_error(greth->dev, dma_addr)))
505  goto map_error;
506 
507  greth_write_bd(&bdp->addr, dma_addr);
508 
509  curr_tx = NEXT_TX(greth->tx_next);
510 
511  /* Frags */
512  for (i = 0; i < nr_frags; i++) {
513  skb_frag_t *frag = &skb_shinfo(skb)->frags[i];
514  greth->tx_skbuff[curr_tx] = NULL;
515  bdp = greth->tx_bd_base + curr_tx;
516 
517  status = GRETH_BD_EN;
518  if (skb->ip_summed == CHECKSUM_PARTIAL)
519  status |= GRETH_TXBD_CSALL;
520  status |= skb_frag_size(frag) & GRETH_BD_LEN;
521 
522  /* Wrap around descriptor ring */
523  if (curr_tx == GRETH_TXBD_NUM_MASK)
524  status |= GRETH_BD_WR;
525 
526  /* More fragments left */
527  if (i < nr_frags - 1)
528  status |= GRETH_TXBD_MORE;
529  else
530  status |= GRETH_BD_IE; /* enable IRQ on last fragment */
531 
532  greth_write_bd(&bdp->stat, status);
533 
534  dma_addr = skb_frag_dma_map(greth->dev, frag, 0, skb_frag_size(frag),
535  DMA_TO_DEVICE);
536 
537  if (unlikely(dma_mapping_error(greth->dev, dma_addr)))
538  goto frag_map_error;
539 
540  greth_write_bd(&bdp->addr, dma_addr);
541 
542  curr_tx = NEXT_TX(curr_tx);
543  }
544 
545  wmb();
546 
547  /* Enable the descriptor chain by enabling the first descriptor */
548  bdp = greth->tx_bd_base + greth->tx_next;
549  greth_write_bd(&bdp->stat, greth_read_bd(&bdp->stat) | GRETH_BD_EN);
550  greth->tx_next = curr_tx;
551  greth->tx_free -= nr_frags + 1;
552 
553  wmb();
554 
555  spin_lock_irqsave(&greth->devlock, flags); /*save from poll/irq*/
556  greth_enable_tx(greth);
557  spin_unlock_irqrestore(&greth->devlock, flags);
558 
559  return NETDEV_TX_OK;
560 
561 frag_map_error:
562  /* Unmap SKB mappings that succeeded and disable descriptor */
563  for (i = 0; greth->tx_next + i != curr_tx; i++) {
564  bdp = greth->tx_bd_base + greth->tx_next + i;
565  dma_unmap_single(greth->dev,
566  greth_read_bd(&bdp->addr),
567  greth_read_bd(&bdp->stat) & GRETH_BD_LEN,
568  DMA_TO_DEVICE);
569  greth_write_bd(&bdp->stat, 0);
570  }
571 map_error:
572  if (net_ratelimit())
573  dev_warn(greth->dev, "Could not create TX DMA mapping\n");
574  dev_kfree_skb(skb);
575 out:
576  return err;
577 }
578 
579 static irqreturn_t greth_interrupt(int irq, void *dev_id)
580 {
581  struct net_device *dev = dev_id;
582  struct greth_private *greth;
583  u32 status, ctrl;
584  irqreturn_t retval = IRQ_NONE;
585 
586  greth = netdev_priv(dev);
587 
588  spin_lock(&greth->devlock);
589 
590  /* Get the interrupt events that caused us to be here. */
591  status = GRETH_REGLOAD(greth->regs->status);
592 
593  /* Must see if interrupts are enabled also, INT_TX|INT_RX flags may be
594  * set regardless of whether IRQ is enabled or not. Especially
595  * important when shared IRQ.
596  */
597  ctrl = GRETH_REGLOAD(greth->regs->control);
598 
599  /* Handle rx and tx interrupts through poll */
600  if (((status & (GRETH_INT_RE | GRETH_INT_RX)) && (ctrl & GRETH_RXI)) ||
601  ((status & (GRETH_INT_TE | GRETH_INT_TX)) && (ctrl & GRETH_TXI))) {
602  retval = IRQ_HANDLED;
603 
604  /* Disable interrupts and schedule poll() */
605  greth_disable_irqs(greth);
606  napi_schedule(&greth->napi);
607  }
608 
609  mmiowb();
610  spin_unlock(&greth->devlock);
611 
612  return retval;
613 }
614 
615 static void greth_clean_tx(struct net_device *dev)
616 {
617  struct greth_private *greth;
618  struct greth_bd *bdp;
619  u32 stat;
620 
621  greth = netdev_priv(dev);
622 
623  while (1) {
624  bdp = greth->tx_bd_base + greth->tx_last;
625  GRETH_REGSAVE(greth->regs->status, GRETH_INT_TE | GRETH_INT_TX);
626  mb();
627  stat = greth_read_bd(&bdp->stat);
628 
629  if (unlikely(stat & GRETH_BD_EN))
630  break;
631 
632  if (greth->tx_free == GRETH_TXBD_NUM)
633  break;
634 
635  /* Check status for errors */
636  if (unlikely(stat & GRETH_TXBD_STATUS)) {
637  dev->stats.tx_errors++;
638  if (stat & GRETH_TXBD_ERR_AL)
639  dev->stats.tx_aborted_errors++;
640  if (stat & GRETH_TXBD_ERR_UE)
641  dev->stats.tx_fifo_errors++;
642  }
643  dev->stats.tx_packets++;
644  dev->stats.tx_bytes += greth->tx_bufs_length[greth->tx_last];
645  greth->tx_last = NEXT_TX(greth->tx_last);
646  greth->tx_free++;
647  }
648 
649  if (greth->tx_free > 0) {
650  netif_wake_queue(dev);
651  }
652 
653 }
654 
655 static inline void greth_update_tx_stats(struct net_device *dev, u32 stat)
656 {
657  /* Check status for errors */
658  if (unlikely(stat & GRETH_TXBD_STATUS)) {
659  dev->stats.tx_errors++;
660  if (stat & GRETH_TXBD_ERR_AL)
661  dev->stats.tx_aborted_errors++;
662  if (stat & GRETH_TXBD_ERR_UE)
663  dev->stats.tx_fifo_errors++;
664  if (stat & GRETH_TXBD_ERR_LC)
665  dev->stats.tx_aborted_errors++;
666  }
667  dev->stats.tx_packets++;
668 }
669 
670 static void greth_clean_tx_gbit(struct net_device *dev)
671 {
672  struct greth_private *greth;
673  struct greth_bd *bdp, *bdp_last_frag;
674  struct sk_buff *skb;
675  u32 stat;
676  int nr_frags, i;
677 
678  greth = netdev_priv(dev);
679 
680  while (greth->tx_free < GRETH_TXBD_NUM) {
681 
682  skb = greth->tx_skbuff[greth->tx_last];
683 
684  nr_frags = skb_shinfo(skb)->nr_frags;
685 
686  /* We only clean fully completed SKBs */
687  bdp_last_frag = greth->tx_bd_base + SKIP_TX(greth->tx_last, nr_frags);
688 
689  GRETH_REGSAVE(greth->regs->status, GRETH_INT_TE | GRETH_INT_TX);
690  mb();
691  stat = greth_read_bd(&bdp_last_frag->stat);
692 
693  if (stat & GRETH_BD_EN)
694  break;
695 
696  greth->tx_skbuff[greth->tx_last] = NULL;
697 
698  greth_update_tx_stats(dev, stat);
699  dev->stats.tx_bytes += skb->len;
700 
701  bdp = greth->tx_bd_base + greth->tx_last;
702 
703  greth->tx_last = NEXT_TX(greth->tx_last);
704 
705  dma_unmap_single(greth->dev,
706  greth_read_bd(&bdp->addr),
707  skb_headlen(skb),
708  DMA_TO_DEVICE);
709 
710  for (i = 0; i < nr_frags; i++) {
711  skb_frag_t *frag = &skb_shinfo(skb)->frags[i];
712  bdp = greth->tx_bd_base + greth->tx_last;
713 
714  dma_unmap_page(greth->dev,
715  greth_read_bd(&bdp->addr),
716  skb_frag_size(frag),
717  DMA_TO_DEVICE);
718 
719  greth->tx_last = NEXT_TX(greth->tx_last);
720  }
721  greth->tx_free += nr_frags+1;
722  dev_kfree_skb(skb);
723  }
724 
725  if (netif_queue_stopped(dev) && (greth->tx_free > (MAX_SKB_FRAGS+1)))
726  netif_wake_queue(dev);
727 }
728 
729 static int greth_rx(struct net_device *dev, int limit)
730 {
731  struct greth_private *greth;
732  struct greth_bd *bdp;
733  struct sk_buff *skb;
734  int pkt_len;
735  int bad, count;
736  u32 status, dma_addr;
737  unsigned long flags;
738 
739  greth = netdev_priv(dev);
740 
741  for (count = 0; count < limit; ++count) {
742 
743  bdp = greth->rx_bd_base + greth->rx_cur;
744  GRETH_REGSAVE(greth->regs->status, GRETH_INT_RE | GRETH_INT_RX);
745  mb();
746  status = greth_read_bd(&bdp->stat);
747 
748  if (unlikely(status & GRETH_BD_EN)) {
749  break;
750  }
751 
752  dma_addr = greth_read_bd(&bdp->addr);
753  bad = 0;
754 
755  /* Check status for errors. */
756  if (unlikely(status & GRETH_RXBD_STATUS)) {
757  if (status & GRETH_RXBD_ERR_FT) {
758  dev->stats.rx_length_errors++;
759  bad = 1;
760  }
761  if (status & (GRETH_RXBD_ERR_AE | GRETH_RXBD_ERR_OE)) {
762  dev->stats.rx_frame_errors++;
763  bad = 1;
764  }
765  if (status & GRETH_RXBD_ERR_CRC) {
766  dev->stats.rx_crc_errors++;
767  bad = 1;
768  }
769  }
770  if (unlikely(bad)) {
771  dev->stats.rx_errors++;
772 
773  } else {
774 
775  pkt_len = status & GRETH_BD_LEN;
776 
777  skb = netdev_alloc_skb(dev, pkt_len + NET_IP_ALIGN);
778 
779  if (unlikely(skb == NULL)) {
780 
781  if (net_ratelimit())
782  dev_warn(&dev->dev, "low on memory - " "packet dropped\n");
783 
784  dev->stats.rx_dropped++;
785 
786  } else {
787  skb_reserve(skb, NET_IP_ALIGN);
788 
789  dma_sync_single_for_cpu(greth->dev,
790  dma_addr,
791  pkt_len,
792  DMA_FROM_DEVICE);
793 
794  if (netif_msg_pktdata(greth))
795  greth_print_rx_packet(phys_to_virt(dma_addr), pkt_len);
796 
797  memcpy(skb_put(skb, pkt_len), phys_to_virt(dma_addr), pkt_len);
798 
799  skb->protocol = eth_type_trans(skb, dev);
800  dev->stats.rx_bytes += pkt_len;
801  dev->stats.rx_packets++;
802  netif_receive_skb(skb);
803  }
804  }
805 
806  status = GRETH_BD_EN | GRETH_BD_IE;
807  if (greth->rx_cur == GRETH_RXBD_NUM_MASK) {
808  status |= GRETH_BD_WR;
809  }
810 
811  wmb();
812  greth_write_bd(&bdp->stat, status);
813 
814  dma_sync_single_for_device(greth->dev, dma_addr, MAX_FRAME_SIZE, DMA_FROM_DEVICE);
815 
816  spin_lock_irqsave(&greth->devlock, flags); /* save from XMIT */
817  greth_enable_rx(greth);
818  spin_unlock_irqrestore(&greth->devlock, flags);
819 
820  greth->rx_cur = NEXT_RX(greth->rx_cur);
821  }
822 
823  return count;
824 }
825 
826 static inline int hw_checksummed(u32 status)
827 {
828 
829  if (status & GRETH_RXBD_IP_FRAG)
830  return 0;
831 
832  if (status & GRETH_RXBD_IP && status & GRETH_RXBD_IP_CSERR)
833  return 0;
834 
835  if (status & GRETH_RXBD_UDP && status & GRETH_RXBD_UDP_CSERR)
836  return 0;
837 
838  if (status & GRETH_RXBD_TCP && status & GRETH_RXBD_TCP_CSERR)
839  return 0;
840 
841  return 1;
842 }
843 
844 static int greth_rx_gbit(struct net_device *dev, int limit)
845 {
846  struct greth_private *greth;
847  struct greth_bd *bdp;
848  struct sk_buff *skb, *newskb;
849  int pkt_len;
850  int bad, count = 0;
851  u32 status, dma_addr;
852  unsigned long flags;
853 
854  greth = netdev_priv(dev);
855 
856  for (count = 0; count < limit; ++count) {
857 
858  bdp = greth->rx_bd_base + greth->rx_cur;
859  skb = greth->rx_skbuff[greth->rx_cur];
860  GRETH_REGSAVE(greth->regs->status, GRETH_INT_RE | GRETH_INT_RX);
861  mb();
862  status = greth_read_bd(&bdp->stat);
863  bad = 0;
864 
865  if (status & GRETH_BD_EN)
866  break;
867 
868  /* Check status for errors. */
869  if (unlikely(status & GRETH_RXBD_STATUS)) {
870 
871  if (status & GRETH_RXBD_ERR_FT) {
872  dev->stats.rx_length_errors++;
873  bad = 1;
874  } else if (status &
875  (GRETH_RXBD_ERR_AE | GRETH_RXBD_ERR_OE | GRETH_RXBD_ERR_LE)) {
876  dev->stats.rx_frame_errors++;
877  bad = 1;
878  } else if (status & GRETH_RXBD_ERR_CRC) {
879  dev->stats.rx_crc_errors++;
880  bad = 1;
881  }
882  }
883 
884  /* Allocate new skb to replace current, not needed if the
885  * current skb can be reused */
886  if (!bad && (newskb=netdev_alloc_skb(dev, MAX_FRAME_SIZE + NET_IP_ALIGN))) {
887  skb_reserve(newskb, NET_IP_ALIGN);
888 
889  dma_addr = dma_map_single(greth->dev,
890  newskb->data,
891  MAX_FRAME_SIZE + NET_IP_ALIGN,
892  DMA_FROM_DEVICE);
893 
894  if (!dma_mapping_error(greth->dev, dma_addr)) {
895  /* Process the incoming frame. */
896  pkt_len = status & GRETH_BD_LEN;
897 
898  dma_unmap_single(greth->dev,
899  greth_read_bd(&bdp->addr),
900  MAX_FRAME_SIZE + NET_IP_ALIGN,
901  DMA_FROM_DEVICE);
902 
903  if (netif_msg_pktdata(greth))
904  greth_print_rx_packet(phys_to_virt(greth_read_bd(&bdp->addr)), pkt_len);
905 
906  skb_put(skb, pkt_len);
907 
908  if (dev->features & NETIF_F_RXCSUM && hw_checksummed(status))
909  skb->ip_summed = CHECKSUM_UNNECESSARY;
910  else
911  skb_checksum_none_assert(skb);
912 
913  skb->protocol = eth_type_trans(skb, dev);
914  dev->stats.rx_packets++;
915  dev->stats.rx_bytes += pkt_len;
916  netif_receive_skb(skb);
917 
918  greth->rx_skbuff[greth->rx_cur] = newskb;
919  greth_write_bd(&bdp->addr, dma_addr);
920  } else {
921  if (net_ratelimit())
922  dev_warn(greth->dev, "Could not create DMA mapping, dropping packet\n");
923  dev_kfree_skb(newskb);
924  /* reusing current skb, so it is a drop */
925  dev->stats.rx_dropped++;
926  }
927  } else if (bad) {
928  /* Bad Frame transfer, the skb is reused */
929  dev->stats.rx_dropped++;
930  } else {
931  /* Failed Allocating a new skb. This is rather stupid
932  * but the current "filled" skb is reused, as if
933  * transfer failure. One could argue that RX descriptor
934  * table handling should be divided into cleaning and
935  * filling as the TX part of the driver
936  */
937  if (net_ratelimit())
938  dev_warn(greth->dev, "Could not allocate SKB, dropping packet\n");
939  /* reusing current skb, so it is a drop */
940  dev->stats.rx_dropped++;
941  }
942 
943  status = GRETH_BD_EN | GRETH_BD_IE;
944  if (greth->rx_cur == GRETH_RXBD_NUM_MASK) {
945  status |= GRETH_BD_WR;
946  }
947 
948  wmb();
949  greth_write_bd(&bdp->stat, status);
950  spin_lock_irqsave(&greth->devlock, flags);
951  greth_enable_rx(greth);
952  spin_unlock_irqrestore(&greth->devlock, flags);
953  greth->rx_cur = NEXT_RX(greth->rx_cur);
954  }
955 
956  return count;
957 
958 }
959 
960 static int greth_poll(struct napi_struct *napi, int budget)
961 {
962  struct greth_private *greth;
963  int work_done = 0;
964  unsigned long flags;
965  u32 mask, ctrl;
966  greth = container_of(napi, struct greth_private, napi);
967 
968 restart_txrx_poll:
969  if (netif_queue_stopped(greth->netdev)) {
970  if (greth->gbit_mac)
971  greth_clean_tx_gbit(greth->netdev);
972  else
973  greth_clean_tx(greth->netdev);
974  }
975 
976  if (greth->gbit_mac) {
977  work_done += greth_rx_gbit(greth->netdev, budget - work_done);
978  } else {
979  work_done += greth_rx(greth->netdev, budget - work_done);
980  }
981 
982  if (work_done < budget) {
983 
984  spin_lock_irqsave(&greth->devlock, flags);
985 
986  ctrl = GRETH_REGLOAD(greth->regs->control);
987  if (netif_queue_stopped(greth->netdev)) {
988  GRETH_REGSAVE(greth->regs->control,
989  ctrl | GRETH_TXI | GRETH_RXI);
990  mask = GRETH_INT_RX | GRETH_INT_RE |
991  GRETH_INT_TX | GRETH_INT_TE;
992  } else {
993  GRETH_REGSAVE(greth->regs->control, ctrl | GRETH_RXI);
994  mask = GRETH_INT_RX | GRETH_INT_RE;
995  }
996 
997  if (GRETH_REGLOAD(greth->regs->status) & mask) {
998  GRETH_REGSAVE(greth->regs->control, ctrl);
999  spin_unlock_irqrestore(&greth->devlock, flags);
1000  goto restart_txrx_poll;
1001  } else {
1002  __napi_complete(napi);
1003  spin_unlock_irqrestore(&greth->devlock, flags);
1004  }
1005  }
1006 
1007  return work_done;
1008 }
1009 
1010 static int greth_set_mac_add(struct net_device *dev, void *p)
1011 {
1012  struct sockaddr *addr = p;
1013  struct greth_private *greth;
1014  struct greth_regs *regs;
1015 
1016  greth = netdev_priv(dev);
1017  regs = greth->regs;
1018 
1019  if (!is_valid_ether_addr(addr->sa_data))
1020  return -EADDRNOTAVAIL;
1021 
1022  memcpy(dev->dev_addr, addr->sa_data, dev->addr_len);
1023  GRETH_REGSAVE(regs->esa_msb, dev->dev_addr[0] << 8 | dev->dev_addr[1]);
1024  GRETH_REGSAVE(regs->esa_lsb, dev->dev_addr[2] << 24 | dev->dev_addr[3] << 16 |
1025  dev->dev_addr[4] << 8 | dev->dev_addr[5]);
1026 
1027  return 0;
1028 }
1029 
1030 static u32 greth_hash_get_index(__u8 *addr)
1031 {
1032  return (ether_crc(6, addr)) & 0x3F;
1033 }
1034 
1035 static void greth_set_hash_filter(struct net_device *dev)
1036 {
1037  struct netdev_hw_addr *ha;
1038  struct greth_private *greth = netdev_priv(dev);
1039  struct greth_regs *regs = greth->regs;
1040  u32 mc_filter[2];
1041  unsigned int bitnr;
1042 
1043  mc_filter[0] = mc_filter[1] = 0;
1044 
1045  netdev_for_each_mc_addr(ha, dev) {
1046  bitnr = greth_hash_get_index(ha->addr);
1047  mc_filter[bitnr >> 5] |= 1 << (bitnr & 31);
1048  }
1049 
1050  GRETH_REGSAVE(regs->hash_msb, mc_filter[1]);
1051  GRETH_REGSAVE(regs->hash_lsb, mc_filter[0]);
1052 }
1053 
1054 static void greth_set_multicast_list(struct net_device *dev)
1055 {
1056  int cfg;
1057  struct greth_private *greth = netdev_priv(dev);
1058  struct greth_regs *regs = greth->regs;
1059 
1060  cfg = GRETH_REGLOAD(regs->control);
1061  if (dev->flags & IFF_PROMISC)
1062  cfg |= GRETH_CTRL_PR;
1063  else
1064  cfg &= ~GRETH_CTRL_PR;
1065 
1066  if (greth->multicast) {
1067  if (dev->flags & IFF_ALLMULTI) {
1068  GRETH_REGSAVE(regs->hash_msb, -1);
1069  GRETH_REGSAVE(regs->hash_lsb, -1);
1070  cfg |= GRETH_CTRL_MCEN;
1071  GRETH_REGSAVE(regs->control, cfg);
1072  return;
1073  }
1074 
1075  if (netdev_mc_empty(dev)) {
1076  cfg &= ~GRETH_CTRL_MCEN;
1077  GRETH_REGSAVE(regs->control, cfg);
1078  return;
1079  }
1080 
1081  /* Setup multicast filter */
1082  greth_set_hash_filter(dev);
1083  cfg |= GRETH_CTRL_MCEN;
1084  }
1085  GRETH_REGSAVE(regs->control, cfg);
1086 }
1087 
1088 static u32 greth_get_msglevel(struct net_device *dev)
1089 {
1090  struct greth_private *greth = netdev_priv(dev);
1091  return greth->msg_enable;
1092 }
1093 
1094 static void greth_set_msglevel(struct net_device *dev, u32 value)
1095 {
1096  struct greth_private *greth = netdev_priv(dev);
1097  greth->msg_enable = value;
1098 }
1099 static int greth_get_settings(struct net_device *dev, struct ethtool_cmd *cmd)
1100 {
1101  struct greth_private *greth = netdev_priv(dev);
1102  struct phy_device *phy = greth->phy;
1103 
1104  if (!phy)
1105  return -ENODEV;
1106 
1107  return phy_ethtool_gset(phy, cmd);
1108 }
1109 
1110 static int greth_set_settings(struct net_device *dev, struct ethtool_cmd *cmd)
1111 {
1112  struct greth_private *greth = netdev_priv(dev);
1113  struct phy_device *phy = greth->phy;
1114 
1115  if (!phy)
1116  return -ENODEV;
1117 
1118  return phy_ethtool_sset(phy, cmd);
1119 }
1120 
1121 static int greth_get_regs_len(struct net_device *dev)
1122 {
1123  return sizeof(struct greth_regs);
1124 }
1125 
1126 static void greth_get_drvinfo(struct net_device *dev, struct ethtool_drvinfo *info)
1127 {
1128  struct greth_private *greth = netdev_priv(dev);
1129 
1130  strncpy(info->driver, dev_driver_string(greth->dev), 32);
1131  strncpy(info->version, "revision: 1.0", 32);
1132  strncpy(info->bus_info, greth->dev->bus->name, 32);
1133  strncpy(info->fw_version, "N/A", 32);
1134  info->eedump_len = 0;
1135  info->regdump_len = sizeof(struct greth_regs);
1136 }
1137 
1138 static void greth_get_regs(struct net_device *dev, struct ethtool_regs *regs, void *p)
1139 {
1140  int i;
1141  struct greth_private *greth = netdev_priv(dev);
1142  u32 __iomem *greth_regs = (u32 __iomem *) greth->regs;
1143  u32 *buff = p;
1144 
1145  for (i = 0; i < sizeof(struct greth_regs) / sizeof(u32); i++)
1146  buff[i] = greth_read_bd(&greth_regs[i]);
1147 }
1148 
1149 static const struct ethtool_ops greth_ethtool_ops = {
1150  .get_msglevel = greth_get_msglevel,
1151  .set_msglevel = greth_set_msglevel,
1152  .get_settings = greth_get_settings,
1153  .set_settings = greth_set_settings,
1154  .get_drvinfo = greth_get_drvinfo,
1155  .get_regs_len = greth_get_regs_len,
1156  .get_regs = greth_get_regs,
1157  .get_link = ethtool_op_get_link,
1158 };
1159 
1160 static struct net_device_ops greth_netdev_ops = {
1161  .ndo_open = greth_open,
1162  .ndo_stop = greth_close,
1163  .ndo_start_xmit = greth_start_xmit,
1164  .ndo_set_mac_address = greth_set_mac_add,
1165  .ndo_validate_addr = eth_validate_addr,
1166 };
1167 
1168 static inline int wait_for_mdio(struct greth_private *greth)
1169 {
1170  unsigned long timeout = jiffies + 4*HZ/100;
1171  while (GRETH_REGLOAD(greth->regs->mdio) & GRETH_MII_BUSY) {
1172  if (time_after(jiffies, timeout))
1173  return 0;
1174  }
1175  return 1;
1176 }
1177 
1178 static int greth_mdio_read(struct mii_bus *bus, int phy, int reg)
1179 {
1180  struct greth_private *greth = bus->priv;
1181  int data;
1182 
1183  if (!wait_for_mdio(greth))
1184  return -EBUSY;
1185 
1186  GRETH_REGSAVE(greth->regs->mdio, ((phy & 0x1F) << 11) | ((reg & 0x1F) << 6) | 2);
1187 
1188  if (!wait_for_mdio(greth))
1189  return -EBUSY;
1190 
1191  if (!(GRETH_REGLOAD(greth->regs->mdio) & GRETH_MII_NVALID)) {
1192  data = (GRETH_REGLOAD(greth->regs->mdio) >> 16) & 0xFFFF;
1193  return data;
1194 
1195  } else {
1196  return -1;
1197  }
1198 }
1199 
1200 static int greth_mdio_write(struct mii_bus *bus, int phy, int reg, u16 val)
1201 {
1202  struct greth_private *greth = bus->priv;
1203 
1204  if (!wait_for_mdio(greth))
1205  return -EBUSY;
1206 
1207  GRETH_REGSAVE(greth->regs->mdio,
1208  ((val & 0xFFFF) << 16) | ((phy & 0x1F) << 11) | ((reg & 0x1F) << 6) | 1);
1209 
1210  if (!wait_for_mdio(greth))
1211  return -EBUSY;
1212 
1213  return 0;
1214 }
1215 
1216 static int greth_mdio_reset(struct mii_bus *bus)
1217 {
1218  return 0;
1219 }
1220 
1221 static void greth_link_change(struct net_device *dev)
1222 {
1223  struct greth_private *greth = netdev_priv(dev);
1224  struct phy_device *phydev = greth->phy;
1225  unsigned long flags;
1226  int status_change = 0;
1227  u32 ctrl;
1228 
1229  spin_lock_irqsave(&greth->devlock, flags);
1230 
1231  if (phydev->link) {
1232 
1233  if ((greth->speed != phydev->speed) || (greth->duplex != phydev->duplex)) {
1234  ctrl = GRETH_REGLOAD(greth->regs->control) &
1235  ~(GRETH_CTRL_FD | GRETH_CTRL_SP | GRETH_CTRL_GB);
1236 
1237  if (phydev->duplex)
1238  ctrl |= GRETH_CTRL_FD;
1239 
1240  if (phydev->speed == SPEED_100)
1241  ctrl |= GRETH_CTRL_SP;
1242  else if (phydev->speed == SPEED_1000)
1243  ctrl |= GRETH_CTRL_GB;
1244 
1245  GRETH_REGSAVE(greth->regs->control, ctrl);
1246  greth->speed = phydev->speed;
1247  greth->duplex = phydev->duplex;
1248  status_change = 1;
1249  }
1250  }
1251 
1252  if (phydev->link != greth->link) {
1253  if (!phydev->link) {
1254  greth->speed = 0;
1255  greth->duplex = -1;
1256  }
1257  greth->link = phydev->link;
1258 
1259  status_change = 1;
1260  }
1261 
1262  spin_unlock_irqrestore(&greth->devlock, flags);
1263 
1264  if (status_change) {
1265  if (phydev->link)
1266  pr_debug("%s: link up (%d/%s)\n",
1267  dev->name, phydev->speed,
1268  DUPLEX_FULL == phydev->duplex ? "Full" : "Half");
1269  else
1270  pr_debug("%s: link down\n", dev->name);
1271  }
1272 }
1273 
1274 static int greth_mdio_probe(struct net_device *dev)
1275 {
1276  struct greth_private *greth = netdev_priv(dev);
1277  struct phy_device *phy = NULL;
1278  int ret;
1279 
1280  /* Find the first PHY */
1281  phy = phy_find_first(greth->mdio);
1282 
1283  if (!phy) {
1284  if (netif_msg_probe(greth))
1285  dev_err(&dev->dev, "no PHY found\n");
1286  return -ENXIO;
1287  }
1288 
1289  ret = phy_connect_direct(dev, phy, &greth_link_change,
1290  0, greth->gbit_mac ?
1291  PHY_INTERFACE_MODE_GMII :
1292  PHY_INTERFACE_MODE_MII);
1293  if (ret) {
1294  if (netif_msg_ifup(greth))
1295  dev_err(&dev->dev, "could not attach to PHY\n");
1296  return ret;
1297  }
1298 
1299  if (greth->gbit_mac)
1300  phy->supported &= PHY_GBIT_FEATURES;
1301  else
1302  phy->supported &= PHY_BASIC_FEATURES;
1303 
1304  phy->advertising = phy->supported;
1305 
1306  greth->link = 0;
1307  greth->speed = 0;
1308  greth->duplex = -1;
1309  greth->phy = phy;
1310 
1311  return 0;
1312 }
1313 
1314 static inline int phy_aneg_done(struct phy_device *phydev)
1315 {
1316  int retval;
1317 
1318  retval = phy_read(phydev, MII_BMSR);
1319 
1320  return (retval < 0) ? retval : (retval & BMSR_ANEGCOMPLETE);
1321 }
1322 
1323 static int greth_mdio_init(struct greth_private *greth)
1324 {
1325  int ret, phy;
1326  unsigned long timeout;
1327 
1328  greth->mdio = mdiobus_alloc();
1329  if (!greth->mdio) {
1330  return -ENOMEM;
1331  }
1332 
1333  greth->mdio->name = "greth-mdio";
1334  snprintf(greth->mdio->id, MII_BUS_ID_SIZE, "%s-%d", greth->mdio->name, greth->irq);
1335  greth->mdio->read = greth_mdio_read;
1336  greth->mdio->write = greth_mdio_write;
1337  greth->mdio->reset = greth_mdio_reset;
1338  greth->mdio->priv = greth;
1339 
1340  greth->mdio->irq = greth->mdio_irqs;
1341 
1342  for (phy = 0; phy < PHY_MAX_ADDR; phy++)
1343  greth->mdio->irq[phy] = PHY_POLL;
1344 
1345  ret = mdiobus_register(greth->mdio);
1346  if (ret) {
1347  goto error;
1348  }
1349 
1350  ret = greth_mdio_probe(greth->netdev);
1351  if (ret) {
1352  if (netif_msg_probe(greth))
1353  dev_err(&greth->netdev->dev, "failed to probe MDIO bus\n");
1354  goto unreg_mdio;
1355  }
1356 
1357  phy_start(greth->phy);
1358 
1359  /* If Ethernet debug link is used make autoneg happen right away */
1360  if (greth->edcl && greth_edcl == 1) {
1361  phy_start_aneg(greth->phy);
1362  timeout = jiffies + 6*HZ;
1363  while (!phy_aneg_done(greth->phy) && time_before(jiffies, timeout)) {
1364  }
1365  genphy_read_status(greth->phy);
1366  greth_link_change(greth->netdev);
1367  }
1368 
1369  return 0;
1370 
1371 unreg_mdio:
1372  mdiobus_unregister(greth->mdio);
1373 error:
1374  mdiobus_free(greth->mdio);
1375  return ret;
1376 }
1377 
1378 /* Initialize the GRETH MAC */
1379 static int __devinit greth_of_probe(struct platform_device *ofdev)
1380 {
1381  struct net_device *dev;
1382  struct greth_private *greth;
1383  struct greth_regs *regs;
1384 
1385  int i;
1386  int err;
1387  int tmp;
1388  unsigned long timeout;
1389 
1390  dev = alloc_etherdev(sizeof(struct greth_private));
1391 
1392  if (dev == NULL)
1393  return -ENOMEM;
1394 
1395  greth = netdev_priv(dev);
1396  greth->netdev = dev;
1397  greth->dev = &ofdev->dev;
1398 
1399  if (greth_debug > 0)
1400  greth->msg_enable = greth_debug;
1401  else
1402  greth->msg_enable = GRETH_DEF_MSG_ENABLE;
1403 
1404  spin_lock_init(&greth->devlock);
1405 
1406  greth->regs = of_ioremap(&ofdev->resource[0], 0,
1407  resource_size(&ofdev->resource[0]),
1408  "grlib-greth regs");
1409 
1410  if (greth->regs == NULL) {
1411  if (netif_msg_probe(greth))
1412  dev_err(greth->dev, "ioremap failure.\n");
1413  err = -EIO;
1414  goto error1;
1415  }
1416 
1417  regs = greth->regs;
1418  greth->irq = ofdev->archdata.irqs[0];
1419 
1420  dev_set_drvdata(greth->dev, dev);
1421  SET_NETDEV_DEV(dev, greth->dev);
1422 
1423  if (netif_msg_probe(greth))
1424  dev_dbg(greth->dev, "resetting controller.\n");
1425 
1426  /* Reset the controller. */
1427  GRETH_REGSAVE(regs->control, GRETH_RESET);
1428 
1429  /* Wait for MAC to reset itself */
1430  timeout = jiffies + HZ/100;
1431  while (GRETH_REGLOAD(regs->control) & GRETH_RESET) {
1432  if (time_after(jiffies, timeout)) {
1433  err = -EIO;
1434  if (netif_msg_probe(greth))
1435  dev_err(greth->dev, "timeout when waiting for reset.\n");
1436  goto error2;
1437  }
1438  }
1439 
1440  /* Get default PHY address */
1441  greth->phyaddr = (GRETH_REGLOAD(regs->mdio) >> 11) & 0x1F;
1442 
1443  /* Check if we have GBIT capable MAC */
1444  tmp = GRETH_REGLOAD(regs->control);
1445  greth->gbit_mac = (tmp >> 27) & 1;
1446 
1447  /* Check for multicast capability */
1448  greth->multicast = (tmp >> 25) & 1;
1449 
1450  greth->edcl = (tmp >> 31) & 1;
1451 
1452  /* If we have EDCL we disable the EDCL speed-duplex FSM so
1453  * it doesn't interfere with the software */
1454  if (greth->edcl != 0)
1455  GRETH_REGORIN(regs->control, GRETH_CTRL_DISDUPLEX);
1456 
1457  /* Check if MAC can handle MDIO interrupts */
1458  greth->mdio_int_en = (tmp >> 26) & 1;
1459 
1460  err = greth_mdio_init(greth);
1461  if (err) {
1462  if (netif_msg_probe(greth))
1463  dev_err(greth->dev, "failed to register MDIO bus\n");
1464  goto error2;
1465  }
1466 
1467  /* Allocate TX descriptor ring in coherent memory */
1468  greth->tx_bd_base = (struct greth_bd *) dma_alloc_coherent(greth->dev,
1469  1024,
1470  &greth->tx_bd_base_phys,
1471  GFP_KERNEL);
1472 
1473  if (!greth->tx_bd_base) {
1474  if (netif_msg_probe(greth))
1475  dev_err(&dev->dev, "could not allocate descriptor memory.\n");
1476  err = -ENOMEM;
1477  goto error3;
1478  }
1479 
1480  memset(greth->tx_bd_base, 0, 1024);
1481 
1482  /* Allocate RX descriptor ring in coherent memory */
1483  greth->rx_bd_base = (struct greth_bd *) dma_alloc_coherent(greth->dev,
1484  1024,
1485  &greth->rx_bd_base_phys,
1486  GFP_KERNEL);
1487 
1488  if (!greth->rx_bd_base) {
1489  if (netif_msg_probe(greth))
1490  dev_err(greth->dev, "could not allocate descriptor memory.\n");
1491  err = -ENOMEM;
1492  goto error4;
1493  }
1494 
1495  memset(greth->rx_bd_base, 0, 1024);
1496 
1497  /* Get MAC address from: module param, OF property or ID prom */
1498  for (i = 0; i < 6; i++) {
1499  if (macaddr[i] != 0)
1500  break;
1501  }
1502  if (i == 6) {
1503  const unsigned char *addr;
1504  int len;
1505  addr = of_get_property(ofdev->dev.of_node, "local-mac-address",
1506  &len);
1507  if (addr != NULL && len == 6) {
1508  for (i = 0; i < 6; i++)
1509  macaddr[i] = (unsigned int) addr[i];
1510  } else {
1511 #ifdef CONFIG_SPARC
1512  for (i = 0; i < 6; i++)
1513  macaddr[i] = (unsigned int) idprom->id_ethaddr[i];
1514 #endif
1515  }
1516  }
1517 
1518  for (i = 0; i < 6; i++)
1519  dev->dev_addr[i] = macaddr[i];
1520 
1521  macaddr[5]++;
1522 
1523  if (!is_valid_ether_addr(&dev->dev_addr[0])) {
1524  if (netif_msg_probe(greth))
1525  dev_err(greth->dev, "no valid ethernet address, aborting.\n");
1526  err = -EINVAL;
1527  goto error5;
1528  }
1529 
1530  GRETH_REGSAVE(regs->esa_msb, dev->dev_addr[0] << 8 | dev->dev_addr[1]);
1531  GRETH_REGSAVE(regs->esa_lsb, dev->dev_addr[2] << 24 | dev->dev_addr[3] << 16 |
1532  dev->dev_addr[4] << 8 | dev->dev_addr[5]);
1533 
1534  /* Clear all pending interrupts except PHY irq */
1535  GRETH_REGSAVE(regs->status, 0xFF);
1536 
1537  if (greth->gbit_mac) {
1538  dev->hw_features = NETIF_F_SG | NETIF_F_IP_CSUM |
1539  NETIF_F_RXCSUM;
1540  dev->features = dev->hw_features | NETIF_F_HIGHDMA;
1541  greth_netdev_ops.ndo_start_xmit = greth_start_xmit_gbit;
1542  }
1543 
1544  if (greth->multicast) {
1545  greth_netdev_ops.ndo_set_rx_mode = greth_set_multicast_list;
1546  dev->flags |= IFF_MULTICAST;
1547  } else {
1548  dev->flags &= ~IFF_MULTICAST;
1549  }
1550 
1551  dev->netdev_ops = &greth_netdev_ops;
1552  dev->ethtool_ops = &greth_ethtool_ops;
1553 
1554  err = register_netdev(dev);
1555  if (err) {
1556  if (netif_msg_probe(greth))
1557  dev_err(greth->dev, "netdevice registration failed.\n");
1558  goto error5;
1559  }
1560 
1561  /* setup NAPI */
1562  netif_napi_add(dev, &greth->napi, greth_poll, 64);
1563 
1564  return 0;
1565 
1566 error5:
1567  dma_free_coherent(greth->dev, 1024, greth->rx_bd_base, greth->rx_bd_base_phys);
1568 error4:
1569  dma_free_coherent(greth->dev, 1024, greth->tx_bd_base, greth->tx_bd_base_phys);
1570 error3:
1571  mdiobus_unregister(greth->mdio);
1572 error2:
1573  of_iounmap(&ofdev->resource[0], greth->regs, resource_size(&ofdev->resource[0]));
1574 error1:
1575  free_netdev(dev);
1576  return err;
1577 }
1578 
1579 static int __devexit greth_of_remove(struct platform_device *of_dev)
1580 {
1581  struct net_device *ndev = dev_get_drvdata(&of_dev->dev);
1582  struct greth_private *greth = netdev_priv(ndev);
1583 
1584  /* Free descriptor areas */
1585  dma_free_coherent(&of_dev->dev, 1024, greth->rx_bd_base, greth->rx_bd_base_phys);
1586 
1587  dma_free_coherent(&of_dev->dev, 1024, greth->tx_bd_base, greth->tx_bd_base_phys);
1588 
1589  dev_set_drvdata(&of_dev->dev, NULL);
1590 
1591  if (greth->phy)
1592  phy_stop(greth->phy);
1593  mdiobus_unregister(greth->mdio);
1594 
1595  unregister_netdev(ndev);
1596  free_netdev(ndev);
1597 
1598  of_iounmap(&of_dev->resource[0], greth->regs, resource_size(&of_dev->resource[0]));
1599 
1600  return 0;
1601 }
1602 
1603 static struct of_device_id greth_of_match[] = {
1604  {
1605  .name = "GAISLER_ETHMAC",
1606  },
1607  {
1608  .name = "01_01d",
1609  },
1610  {},
1611 };
1612 
1613 MODULE_DEVICE_TABLE(of, greth_of_match);
1614 
1615 static struct platform_driver greth_of_driver = {
1616  .driver = {
1617  .name = "grlib-greth",
1618  .owner = THIS_MODULE,
1619  .of_match_table = greth_of_match,
1620  },
1621  .probe = greth_of_probe,
1622  .remove = __devexit_p(greth_of_remove),
1623 };
1624 
1625 module_platform_driver(greth_of_driver);
1626 
1627 MODULE_AUTHOR("Aeroflex Gaisler AB.");
1628 MODULE_DESCRIPTION("Aeroflex Gaisler Ethernet MAC driver");
1629 MODULE_LICENSE("GPL");
Generated on Thu Jan 10 2013 13:58:17 for Linux Kernel by   doxygen 1.8.2