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/aeroflex/greth.c

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

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