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1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * Aeroflex Gaisler GRETH 10/100/1G Ethernet MAC.
4 *
5 * 2005-2010 (c) Aeroflex Gaisler AB
6 *
7 * This driver supports GRETH 10/100 and GRETH 10/100/1G Ethernet MACs
8 * available in the GRLIB VHDL IP core library.
9 *
10 * Full documentation of both cores can be found here:
11 * https://www.gaisler.com/products/grlib/grip.pdf
12 *
13 * The Gigabit version supports scatter/gather DMA, any alignment of
14 * buffers and checksum offloading.
15 *
16 * Contributors: Kristoffer Glembo
17 * Daniel Hellstrom
18 * Marko Isomaki
19 */
20
21#include <linux/dma-mapping.h>
22#include <linux/module.h>
23#include <linux/uaccess.h>
24#include <linux/interrupt.h>
25#include <linux/netdevice.h>
26#include <linux/etherdevice.h>
27#include <linux/ethtool.h>
28#include <linux/skbuff.h>
29#include <linux/io.h>
30#include <linux/crc32.h>
31#include <linux/mii.h>
32#include <linux/of.h>
33#include <linux/of_net.h>
34#include <linux/platform_device.h>
35#include <linux/slab.h>
36#include <asm/cacheflush.h>
37#include <asm/byteorder.h>
38
39#ifdef CONFIG_SPARC
40#include <asm/idprom.h>
41#endif
42
43#include "greth.h"
44
45#define GRETH_DEF_MSG_ENABLE \
46 (NETIF_MSG_DRV | \
47 NETIF_MSG_PROBE | \
48 NETIF_MSG_LINK | \
49 NETIF_MSG_IFDOWN | \
50 NETIF_MSG_IFUP | \
51 NETIF_MSG_RX_ERR | \
52 NETIF_MSG_TX_ERR)
53
54static int greth_debug = -1; /* -1 == use GRETH_DEF_MSG_ENABLE as value */
55module_param(greth_debug, int, 0);
56MODULE_PARM_DESC(greth_debug, "GRETH bitmapped debugging message enable value");
57
58/* Accept MAC address of the form macaddr=0x08,0x00,0x20,0x30,0x40,0x50 */
59static int macaddr[6];
60module_param_array(macaddr, int, NULL, 0);
61MODULE_PARM_DESC(macaddr, "GRETH Ethernet MAC address");
62
63static int greth_edcl = 1;
64module_param(greth_edcl, int, 0);
65MODULE_PARM_DESC(greth_edcl, "GRETH EDCL usage indicator. Set to 1 if EDCL is used.");
66
67static int greth_open(struct net_device *dev);
68static netdev_tx_t greth_start_xmit(struct sk_buff *skb,
69 struct net_device *dev);
70static netdev_tx_t greth_start_xmit_gbit(struct sk_buff *skb,
71 struct net_device *dev);
72static int greth_rx(struct net_device *dev, int limit);
73static int greth_rx_gbit(struct net_device *dev, int limit);
74static void greth_clean_tx(struct net_device *dev);
75static void greth_clean_tx_gbit(struct net_device *dev);
76static irqreturn_t greth_interrupt(int irq, void *dev_id);
77static int greth_close(struct net_device *dev);
78static int greth_set_mac_add(struct net_device *dev, void *p);
79static void greth_set_multicast_list(struct net_device *dev);
80
81#define GRETH_REGLOAD(a) (be32_to_cpu(__raw_readl(&(a))))
82#define GRETH_REGSAVE(a, v) (__raw_writel(cpu_to_be32(v), &(a)))
83#define GRETH_REGORIN(a, v) (GRETH_REGSAVE(a, (GRETH_REGLOAD(a) | (v))))
84#define GRETH_REGANDIN(a, v) (GRETH_REGSAVE(a, (GRETH_REGLOAD(a) & (v))))
85
86#define NEXT_TX(N) (((N) + 1) & GRETH_TXBD_NUM_MASK)
87#define SKIP_TX(N, C) (((N) + C) & GRETH_TXBD_NUM_MASK)
88#define NEXT_RX(N) (((N) + 1) & GRETH_RXBD_NUM_MASK)
89
90static void greth_print_rx_packet(void *addr, int len)
91{
92 print_hex_dump(KERN_DEBUG, "RX: ", DUMP_PREFIX_OFFSET, 16, 1,
93 addr, len, true);
94}
95
96static void greth_print_tx_packet(struct sk_buff *skb)
97{
98 int i;
99 int length;
100
101 if (skb_shinfo(skb)->nr_frags == 0)
102 length = skb->len;
103 else
104 length = skb_headlen(skb);
105
106 print_hex_dump(KERN_DEBUG, "TX: ", DUMP_PREFIX_OFFSET, 16, 1,
107 skb->data, length, true);
108
109 for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) {
110
111 print_hex_dump(KERN_DEBUG, "TX: ", DUMP_PREFIX_OFFSET, 16, 1,
112 skb_frag_address(&skb_shinfo(skb)->frags[i]),
113 skb_frag_size(&skb_shinfo(skb)->frags[i]), true);
114 }
115}
116
117static inline void greth_enable_tx(struct greth_private *greth)
118{
119 wmb();
120 GRETH_REGORIN(greth->regs->control, GRETH_TXEN);
121}
122
123static inline void greth_enable_tx_and_irq(struct greth_private *greth)
124{
125 wmb(); /* BDs must been written to memory before enabling TX */
126 GRETH_REGORIN(greth->regs->control, GRETH_TXEN | GRETH_TXI);
127}
128
129static inline void greth_disable_tx(struct greth_private *greth)
130{
131 GRETH_REGANDIN(greth->regs->control, ~GRETH_TXEN);
132}
133
134static inline void greth_enable_rx(struct greth_private *greth)
135{
136 wmb();
137 GRETH_REGORIN(greth->regs->control, GRETH_RXEN);
138}
139
140static inline void greth_disable_rx(struct greth_private *greth)
141{
142 GRETH_REGANDIN(greth->regs->control, ~GRETH_RXEN);
143}
144
145static inline void greth_enable_irqs(struct greth_private *greth)
146{
147 GRETH_REGORIN(greth->regs->control, GRETH_RXI | GRETH_TXI);
148}
149
150static inline void greth_disable_irqs(struct greth_private *greth)
151{
152 GRETH_REGANDIN(greth->regs->control, ~(GRETH_RXI|GRETH_TXI));
153}
154
155static inline void greth_write_bd(u32 *bd, u32 val)
156{
157 __raw_writel(cpu_to_be32(val), bd);
158}
159
160static inline u32 greth_read_bd(u32 *bd)
161{
162 return be32_to_cpu(__raw_readl(bd));
163}
164
165static void greth_clean_rings(struct greth_private *greth)
166{
167 int i;
168 struct greth_bd *rx_bdp = greth->rx_bd_base;
169 struct greth_bd *tx_bdp = greth->tx_bd_base;
170
171 if (greth->gbit_mac) {
172
173 /* Free and unmap RX buffers */
174 for (i = 0; i < GRETH_RXBD_NUM; i++, rx_bdp++) {
175 if (greth->rx_skbuff[i] != NULL) {
176 dev_kfree_skb(greth->rx_skbuff[i]);
177 dma_unmap_single(greth->dev,
178 greth_read_bd(&rx_bdp->addr),
179 MAX_FRAME_SIZE+NET_IP_ALIGN,
180 DMA_FROM_DEVICE);
181 }
182 }
183
184 /* TX buffers */
185 while (greth->tx_free < GRETH_TXBD_NUM) {
186
187 struct sk_buff *skb = greth->tx_skbuff[greth->tx_last];
188 int nr_frags = skb_shinfo(skb)->nr_frags;
189 tx_bdp = greth->tx_bd_base + greth->tx_last;
190 greth->tx_last = NEXT_TX(greth->tx_last);
191
192 dma_unmap_single(greth->dev,
193 greth_read_bd(&tx_bdp->addr),
194 skb_headlen(skb),
195 DMA_TO_DEVICE);
196
197 for (i = 0; i < nr_frags; i++) {
198 skb_frag_t *frag = &skb_shinfo(skb)->frags[i];
199 tx_bdp = greth->tx_bd_base + greth->tx_last;
200
201 dma_unmap_page(greth->dev,
202 greth_read_bd(&tx_bdp->addr),
203 skb_frag_size(frag),
204 DMA_TO_DEVICE);
205
206 greth->tx_last = NEXT_TX(greth->tx_last);
207 }
208 greth->tx_free += nr_frags+1;
209 dev_kfree_skb(skb);
210 }
211
212
213 } else { /* 10/100 Mbps MAC */
214
215 for (i = 0; i < GRETH_RXBD_NUM; i++, rx_bdp++) {
216 kfree(greth->rx_bufs[i]);
217 dma_unmap_single(greth->dev,
218 greth_read_bd(&rx_bdp->addr),
219 MAX_FRAME_SIZE,
220 DMA_FROM_DEVICE);
221 }
222 for (i = 0; i < GRETH_TXBD_NUM; i++, tx_bdp++) {
223 kfree(greth->tx_bufs[i]);
224 dma_unmap_single(greth->dev,
225 greth_read_bd(&tx_bdp->addr),
226 MAX_FRAME_SIZE,
227 DMA_TO_DEVICE);
228 }
229 }
230}
231
232static int greth_init_rings(struct greth_private *greth)
233{
234 struct sk_buff *skb;
235 struct greth_bd *rx_bd, *tx_bd;
236 u32 dma_addr;
237 int i;
238
239 rx_bd = greth->rx_bd_base;
240 tx_bd = greth->tx_bd_base;
241
242 /* Initialize descriptor rings and buffers */
243 if (greth->gbit_mac) {
244
245 for (i = 0; i < GRETH_RXBD_NUM; i++) {
246 skb = netdev_alloc_skb(greth->netdev, MAX_FRAME_SIZE+NET_IP_ALIGN);
247 if (skb == NULL) {
248 if (netif_msg_ifup(greth))
249 dev_err(greth->dev, "Error allocating DMA ring.\n");
250 goto cleanup;
251 }
252 skb_reserve(skb, NET_IP_ALIGN);
253 dma_addr = dma_map_single(greth->dev,
254 skb->data,
255 MAX_FRAME_SIZE+NET_IP_ALIGN,
256 DMA_FROM_DEVICE);
257
258 if (dma_mapping_error(greth->dev, dma_addr)) {
259 if (netif_msg_ifup(greth))
260 dev_err(greth->dev, "Could not create initial DMA mapping\n");
261 dev_kfree_skb(skb);
262 goto cleanup;
263 }
264 greth->rx_skbuff[i] = skb;
265 greth_write_bd(&rx_bd[i].addr, dma_addr);
266 greth_write_bd(&rx_bd[i].stat, GRETH_BD_EN | GRETH_BD_IE);
267 }
268
269 } else {
270
271 /* 10/100 MAC uses a fixed set of buffers and copy to/from SKBs */
272 for (i = 0; i < GRETH_RXBD_NUM; i++) {
273
274 greth->rx_bufs[i] = kmalloc(MAX_FRAME_SIZE, GFP_KERNEL);
275
276 if (greth->rx_bufs[i] == NULL) {
277 if (netif_msg_ifup(greth))
278 dev_err(greth->dev, "Error allocating DMA ring.\n");
279 goto cleanup;
280 }
281
282 dma_addr = dma_map_single(greth->dev,
283 greth->rx_bufs[i],
284 MAX_FRAME_SIZE,
285 DMA_FROM_DEVICE);
286
287 if (dma_mapping_error(greth->dev, dma_addr)) {
288 if (netif_msg_ifup(greth))
289 dev_err(greth->dev, "Could not create initial DMA mapping\n");
290 goto cleanup;
291 }
292 greth_write_bd(&rx_bd[i].addr, dma_addr);
293 greth_write_bd(&rx_bd[i].stat, GRETH_BD_EN | GRETH_BD_IE);
294 }
295 for (i = 0; i < GRETH_TXBD_NUM; i++) {
296
297 greth->tx_bufs[i] = kmalloc(MAX_FRAME_SIZE, GFP_KERNEL);
298
299 if (greth->tx_bufs[i] == NULL) {
300 if (netif_msg_ifup(greth))
301 dev_err(greth->dev, "Error allocating DMA ring.\n");
302 goto cleanup;
303 }
304
305 dma_addr = dma_map_single(greth->dev,
306 greth->tx_bufs[i],
307 MAX_FRAME_SIZE,
308 DMA_TO_DEVICE);
309
310 if (dma_mapping_error(greth->dev, dma_addr)) {
311 if (netif_msg_ifup(greth))
312 dev_err(greth->dev, "Could not create initial DMA mapping\n");
313 goto cleanup;
314 }
315 greth_write_bd(&tx_bd[i].addr, dma_addr);
316 greth_write_bd(&tx_bd[i].stat, 0);
317 }
318 }
319 greth_write_bd(&rx_bd[GRETH_RXBD_NUM - 1].stat,
320 greth_read_bd(&rx_bd[GRETH_RXBD_NUM - 1].stat) | GRETH_BD_WR);
321
322 /* Initialize pointers. */
323 greth->rx_cur = 0;
324 greth->tx_next = 0;
325 greth->tx_last = 0;
326 greth->tx_free = GRETH_TXBD_NUM;
327
328 /* Initialize descriptor base address */
329 GRETH_REGSAVE(greth->regs->tx_desc_p, greth->tx_bd_base_phys);
330 GRETH_REGSAVE(greth->regs->rx_desc_p, greth->rx_bd_base_phys);
331
332 return 0;
333
334cleanup:
335 greth_clean_rings(greth);
336 return -ENOMEM;
337}
338
339static int greth_open(struct net_device *dev)
340{
341 struct greth_private *greth = netdev_priv(dev);
342 int err;
343
344 err = greth_init_rings(greth);
345 if (err) {
346 if (netif_msg_ifup(greth))
347 dev_err(&dev->dev, "Could not allocate memory for DMA rings\n");
348 return err;
349 }
350
351 err = request_irq(greth->irq, greth_interrupt, 0, "eth", (void *) dev);
352 if (err) {
353 if (netif_msg_ifup(greth))
354 dev_err(&dev->dev, "Could not allocate interrupt %d\n", dev->irq);
355 greth_clean_rings(greth);
356 return err;
357 }
358
359 if (netif_msg_ifup(greth))
360 dev_dbg(&dev->dev, " starting queue\n");
361 netif_start_queue(dev);
362
363 GRETH_REGSAVE(greth->regs->status, 0xFF);
364
365 napi_enable(&greth->napi);
366
367 greth_enable_irqs(greth);
368 greth_enable_tx(greth);
369 greth_enable_rx(greth);
370 return 0;
371
372}
373
374static int greth_close(struct net_device *dev)
375{
376 struct greth_private *greth = netdev_priv(dev);
377
378 napi_disable(&greth->napi);
379
380 greth_disable_irqs(greth);
381 greth_disable_tx(greth);
382 greth_disable_rx(greth);
383
384 netif_stop_queue(dev);
385
386 free_irq(greth->irq, (void *) dev);
387
388 greth_clean_rings(greth);
389
390 return 0;
391}
392
393static netdev_tx_t
394greth_start_xmit(struct sk_buff *skb, struct net_device *dev)
395{
396 struct greth_private *greth = netdev_priv(dev);
397 struct greth_bd *bdp;
398 int err = NETDEV_TX_OK;
399 u32 status, dma_addr, ctrl;
400 unsigned long flags;
401
402 /* Clean TX Ring */
403 greth_clean_tx(greth->netdev);
404
405 if (unlikely(greth->tx_free <= 0)) {
406 spin_lock_irqsave(&greth->devlock, flags);/*save from poll/irq*/
407 ctrl = GRETH_REGLOAD(greth->regs->control);
408 /* Enable TX IRQ only if not already in poll() routine */
409 if (ctrl & GRETH_RXI)
410 GRETH_REGSAVE(greth->regs->control, ctrl | GRETH_TXI);
411 netif_stop_queue(dev);
412 spin_unlock_irqrestore(&greth->devlock, flags);
413 return NETDEV_TX_BUSY;
414 }
415
416 if (netif_msg_pktdata(greth))
417 greth_print_tx_packet(skb);
418
419
420 if (unlikely(skb->len > MAX_FRAME_SIZE)) {
421 dev->stats.tx_errors++;
422 goto out;
423 }
424
425 bdp = greth->tx_bd_base + greth->tx_next;
426 dma_addr = greth_read_bd(&bdp->addr);
427
428 memcpy((unsigned char *) phys_to_virt(dma_addr), skb->data, skb->len);
429
430 dma_sync_single_for_device(greth->dev, dma_addr, skb->len, DMA_TO_DEVICE);
431
432 status = GRETH_BD_EN | GRETH_BD_IE | (skb->len & GRETH_BD_LEN);
433 greth->tx_bufs_length[greth->tx_next] = skb->len & GRETH_BD_LEN;
434
435 /* Wrap around descriptor ring */
436 if (greth->tx_next == GRETH_TXBD_NUM_MASK) {
437 status |= GRETH_BD_WR;
438 }
439
440 greth->tx_next = NEXT_TX(greth->tx_next);
441 greth->tx_free--;
442
443 /* Write descriptor control word and enable transmission */
444 greth_write_bd(&bdp->stat, status);
445 spin_lock_irqsave(&greth->devlock, flags); /*save from poll/irq*/
446 greth_enable_tx(greth);
447 spin_unlock_irqrestore(&greth->devlock, flags);
448
449out:
450 dev_kfree_skb(skb);
451 return err;
452}
453
454static inline u16 greth_num_free_bds(u16 tx_last, u16 tx_next)
455{
456 if (tx_next < tx_last)
457 return (tx_last - tx_next) - 1;
458 else
459 return GRETH_TXBD_NUM - (tx_next - tx_last) - 1;
460}
461
462static netdev_tx_t
463greth_start_xmit_gbit(struct sk_buff *skb, struct net_device *dev)
464{
465 struct greth_private *greth = netdev_priv(dev);
466 struct greth_bd *bdp;
467 u32 status, dma_addr;
468 int curr_tx, nr_frags, i, err = NETDEV_TX_OK;
469 unsigned long flags;
470 u16 tx_last;
471
472 nr_frags = skb_shinfo(skb)->nr_frags;
473 tx_last = greth->tx_last;
474 rmb(); /* tx_last is updated by the poll task */
475
476 if (greth_num_free_bds(tx_last, greth->tx_next) < nr_frags + 1) {
477 netif_stop_queue(dev);
478 err = NETDEV_TX_BUSY;
479 goto out;
480 }
481
482 if (netif_msg_pktdata(greth))
483 greth_print_tx_packet(skb);
484
485 if (unlikely(skb->len > MAX_FRAME_SIZE)) {
486 dev->stats.tx_errors++;
487 goto len_error;
488 }
489
490 /* Save skb pointer. */
491 greth->tx_skbuff[greth->tx_next] = skb;
492
493 /* Linear buf */
494 if (nr_frags != 0)
495 status = GRETH_TXBD_MORE;
496 else
497 status = GRETH_BD_IE;
498
499 if (skb->ip_summed == CHECKSUM_PARTIAL)
500 status |= GRETH_TXBD_CSALL;
501 status |= skb_headlen(skb) & GRETH_BD_LEN;
502 if (greth->tx_next == GRETH_TXBD_NUM_MASK)
503 status |= GRETH_BD_WR;
504
505
506 bdp = greth->tx_bd_base + greth->tx_next;
507 greth_write_bd(&bdp->stat, status);
508 dma_addr = dma_map_single(greth->dev, skb->data, skb_headlen(skb), DMA_TO_DEVICE);
509
510 if (unlikely(dma_mapping_error(greth->dev, dma_addr)))
511 goto map_error;
512
513 greth_write_bd(&bdp->addr, dma_addr);
514
515 curr_tx = NEXT_TX(greth->tx_next);
516
517 /* Frags */
518 for (i = 0; i < nr_frags; i++) {
519 skb_frag_t *frag = &skb_shinfo(skb)->frags[i];
520 greth->tx_skbuff[curr_tx] = NULL;
521 bdp = greth->tx_bd_base + curr_tx;
522
523 status = GRETH_BD_EN;
524 if (skb->ip_summed == CHECKSUM_PARTIAL)
525 status |= GRETH_TXBD_CSALL;
526 status |= skb_frag_size(frag) & GRETH_BD_LEN;
527
528 /* Wrap around descriptor ring */
529 if (curr_tx == GRETH_TXBD_NUM_MASK)
530 status |= GRETH_BD_WR;
531
532 /* More fragments left */
533 if (i < nr_frags - 1)
534 status |= GRETH_TXBD_MORE;
535 else
536 status |= GRETH_BD_IE; /* enable IRQ on last fragment */
537
538 greth_write_bd(&bdp->stat, status);
539
540 dma_addr = skb_frag_dma_map(greth->dev, frag, 0, skb_frag_size(frag),
541 DMA_TO_DEVICE);
542
543 if (unlikely(dma_mapping_error(greth->dev, dma_addr)))
544 goto frag_map_error;
545
546 greth_write_bd(&bdp->addr, dma_addr);
547
548 curr_tx = NEXT_TX(curr_tx);
549 }
550
551 wmb();
552
553 /* Enable the descriptor chain by enabling the first descriptor */
554 bdp = greth->tx_bd_base + greth->tx_next;
555 greth_write_bd(&bdp->stat,
556 greth_read_bd(&bdp->stat) | GRETH_BD_EN);
557
558 spin_lock_irqsave(&greth->devlock, flags); /*save from poll/irq*/
559 greth->tx_next = curr_tx;
560 greth_enable_tx_and_irq(greth);
561 spin_unlock_irqrestore(&greth->devlock, flags);
562
563 return NETDEV_TX_OK;
564
565frag_map_error:
566 /* Unmap SKB mappings that succeeded and disable descriptor */
567 for (i = 0; greth->tx_next + i != curr_tx; i++) {
568 bdp = greth->tx_bd_base + greth->tx_next + i;
569 dma_unmap_single(greth->dev,
570 greth_read_bd(&bdp->addr),
571 greth_read_bd(&bdp->stat) & GRETH_BD_LEN,
572 DMA_TO_DEVICE);
573 greth_write_bd(&bdp->stat, 0);
574 }
575map_error:
576 if (net_ratelimit())
577 dev_warn(greth->dev, "Could not create TX DMA mapping\n");
578len_error:
579 dev_kfree_skb(skb);
580out:
581 return err;
582}
583
584static irqreturn_t greth_interrupt(int irq, void *dev_id)
585{
586 struct net_device *dev = dev_id;
587 struct greth_private *greth;
588 u32 status, ctrl;
589 irqreturn_t retval = IRQ_NONE;
590
591 greth = netdev_priv(dev);
592
593 spin_lock(&greth->devlock);
594
595 /* Get the interrupt events that caused us to be here. */
596 status = GRETH_REGLOAD(greth->regs->status);
597
598 /* Must see if interrupts are enabled also, INT_TX|INT_RX flags may be
599 * set regardless of whether IRQ is enabled or not. Especially
600 * important when shared IRQ.
601 */
602 ctrl = GRETH_REGLOAD(greth->regs->control);
603
604 /* Handle rx and tx interrupts through poll */
605 if (((status & (GRETH_INT_RE | GRETH_INT_RX)) && (ctrl & GRETH_RXI)) ||
606 ((status & (GRETH_INT_TE | GRETH_INT_TX)) && (ctrl & GRETH_TXI))) {
607 retval = IRQ_HANDLED;
608
609 /* Disable interrupts and schedule poll() */
610 greth_disable_irqs(greth);
611 napi_schedule(&greth->napi);
612 }
613
614 spin_unlock(&greth->devlock);
615
616 return retval;
617}
618
619static void greth_clean_tx(struct net_device *dev)
620{
621 struct greth_private *greth;
622 struct greth_bd *bdp;
623 u32 stat;
624
625 greth = netdev_priv(dev);
626
627 while (1) {
628 bdp = greth->tx_bd_base + greth->tx_last;
629 GRETH_REGSAVE(greth->regs->status, GRETH_INT_TE | GRETH_INT_TX);
630 mb();
631 stat = greth_read_bd(&bdp->stat);
632
633 if (unlikely(stat & GRETH_BD_EN))
634 break;
635
636 if (greth->tx_free == GRETH_TXBD_NUM)
637 break;
638
639 /* Check status for errors */
640 if (unlikely(stat & GRETH_TXBD_STATUS)) {
641 dev->stats.tx_errors++;
642 if (stat & GRETH_TXBD_ERR_AL)
643 dev->stats.tx_aborted_errors++;
644 if (stat & GRETH_TXBD_ERR_UE)
645 dev->stats.tx_fifo_errors++;
646 }
647 dev->stats.tx_packets++;
648 dev->stats.tx_bytes += greth->tx_bufs_length[greth->tx_last];
649 greth->tx_last = NEXT_TX(greth->tx_last);
650 greth->tx_free++;
651 }
652
653 if (greth->tx_free > 0) {
654 netif_wake_queue(dev);
655 }
656}
657
658static inline void greth_update_tx_stats(struct net_device *dev, u32 stat)
659{
660 /* Check status for errors */
661 if (unlikely(stat & GRETH_TXBD_STATUS)) {
662 dev->stats.tx_errors++;
663 if (stat & GRETH_TXBD_ERR_AL)
664 dev->stats.tx_aborted_errors++;
665 if (stat & GRETH_TXBD_ERR_UE)
666 dev->stats.tx_fifo_errors++;
667 if (stat & GRETH_TXBD_ERR_LC)
668 dev->stats.tx_aborted_errors++;
669 }
670 dev->stats.tx_packets++;
671}
672
673static void greth_clean_tx_gbit(struct net_device *dev)
674{
675 struct greth_private *greth;
676 struct greth_bd *bdp, *bdp_last_frag;
677 struct sk_buff *skb = NULL;
678 u32 stat;
679 int nr_frags, i;
680 u16 tx_last;
681
682 greth = netdev_priv(dev);
683 tx_last = greth->tx_last;
684
685 while (tx_last != greth->tx_next) {
686
687 skb = greth->tx_skbuff[tx_last];
688
689 nr_frags = skb_shinfo(skb)->nr_frags;
690
691 /* We only clean fully completed SKBs */
692 bdp_last_frag = greth->tx_bd_base + SKIP_TX(tx_last, nr_frags);
693
694 GRETH_REGSAVE(greth->regs->status, GRETH_INT_TE | GRETH_INT_TX);
695 mb();
696 stat = greth_read_bd(&bdp_last_frag->stat);
697
698 if (stat & GRETH_BD_EN)
699 break;
700
701 greth->tx_skbuff[tx_last] = NULL;
702
703 greth_update_tx_stats(dev, stat);
704 dev->stats.tx_bytes += skb->len;
705
706 bdp = greth->tx_bd_base + tx_last;
707
708 tx_last = NEXT_TX(tx_last);
709
710 dma_unmap_single(greth->dev,
711 greth_read_bd(&bdp->addr),
712 skb_headlen(skb),
713 DMA_TO_DEVICE);
714
715 for (i = 0; i < nr_frags; i++) {
716 skb_frag_t *frag = &skb_shinfo(skb)->frags[i];
717 bdp = greth->tx_bd_base + tx_last;
718
719 dma_unmap_page(greth->dev,
720 greth_read_bd(&bdp->addr),
721 skb_frag_size(frag),
722 DMA_TO_DEVICE);
723
724 tx_last = NEXT_TX(tx_last);
725 }
726 dev_kfree_skb(skb);
727 }
728 if (skb) { /* skb is set only if the above while loop was entered */
729 wmb();
730 greth->tx_last = tx_last;
731
732 if (netif_queue_stopped(dev) &&
733 (greth_num_free_bds(tx_last, greth->tx_next) >
734 (MAX_SKB_FRAGS+1)))
735 netif_wake_queue(dev);
736 }
737}
738
739static int greth_rx(struct net_device *dev, int limit)
740{
741 struct greth_private *greth;
742 struct greth_bd *bdp;
743 struct sk_buff *skb;
744 int pkt_len;
745 int bad, count;
746 u32 status, dma_addr;
747 unsigned long flags;
748
749 greth = netdev_priv(dev);
750
751 for (count = 0; count < limit; ++count) {
752
753 bdp = greth->rx_bd_base + greth->rx_cur;
754 GRETH_REGSAVE(greth->regs->status, GRETH_INT_RE | GRETH_INT_RX);
755 mb();
756 status = greth_read_bd(&bdp->stat);
757
758 if (unlikely(status & GRETH_BD_EN)) {
759 break;
760 }
761
762 dma_addr = greth_read_bd(&bdp->addr);
763 bad = 0;
764
765 /* Check status for errors. */
766 if (unlikely(status & GRETH_RXBD_STATUS)) {
767 if (status & GRETH_RXBD_ERR_FT) {
768 dev->stats.rx_length_errors++;
769 bad = 1;
770 }
771 if (status & (GRETH_RXBD_ERR_AE | GRETH_RXBD_ERR_OE)) {
772 dev->stats.rx_frame_errors++;
773 bad = 1;
774 }
775 if (status & GRETH_RXBD_ERR_CRC) {
776 dev->stats.rx_crc_errors++;
777 bad = 1;
778 }
779 }
780 if (unlikely(bad)) {
781 dev->stats.rx_errors++;
782
783 } else {
784
785 pkt_len = status & GRETH_BD_LEN;
786
787 skb = netdev_alloc_skb(dev, pkt_len + NET_IP_ALIGN);
788
789 if (unlikely(skb == NULL)) {
790
791 if (net_ratelimit())
792 dev_warn(&dev->dev, "low on memory - " "packet dropped\n");
793
794 dev->stats.rx_dropped++;
795
796 } else {
797 skb_reserve(skb, NET_IP_ALIGN);
798
799 dma_sync_single_for_cpu(greth->dev,
800 dma_addr,
801 pkt_len,
802 DMA_FROM_DEVICE);
803
804 if (netif_msg_pktdata(greth))
805 greth_print_rx_packet(phys_to_virt(dma_addr), pkt_len);
806
807 skb_put_data(skb, phys_to_virt(dma_addr),
808 pkt_len);
809
810 skb->protocol = eth_type_trans(skb, dev);
811 dev->stats.rx_bytes += pkt_len;
812 dev->stats.rx_packets++;
813 netif_receive_skb(skb);
814 }
815 }
816
817 status = GRETH_BD_EN | GRETH_BD_IE;
818 if (greth->rx_cur == GRETH_RXBD_NUM_MASK) {
819 status |= GRETH_BD_WR;
820 }
821
822 wmb();
823 greth_write_bd(&bdp->stat, status);
824
825 dma_sync_single_for_device(greth->dev, dma_addr, MAX_FRAME_SIZE, DMA_FROM_DEVICE);
826
827 spin_lock_irqsave(&greth->devlock, flags); /* save from XMIT */
828 greth_enable_rx(greth);
829 spin_unlock_irqrestore(&greth->devlock, flags);
830
831 greth->rx_cur = NEXT_RX(greth->rx_cur);
832 }
833
834 return count;
835}
836
837static inline int hw_checksummed(u32 status)
838{
839
840 if (status & GRETH_RXBD_IP_FRAG)
841 return 0;
842
843 if (status & GRETH_RXBD_IP && status & GRETH_RXBD_IP_CSERR)
844 return 0;
845
846 if (status & GRETH_RXBD_UDP && status & GRETH_RXBD_UDP_CSERR)
847 return 0;
848
849 if (status & GRETH_RXBD_TCP && status & GRETH_RXBD_TCP_CSERR)
850 return 0;
851
852 return 1;
853}
854
855static int greth_rx_gbit(struct net_device *dev, int limit)
856{
857 struct greth_private *greth;
858 struct greth_bd *bdp;
859 struct sk_buff *skb, *newskb;
860 int pkt_len;
861 int bad, count = 0;
862 u32 status, dma_addr;
863 unsigned long flags;
864
865 greth = netdev_priv(dev);
866
867 for (count = 0; count < limit; ++count) {
868
869 bdp = greth->rx_bd_base + greth->rx_cur;
870 skb = greth->rx_skbuff[greth->rx_cur];
871 GRETH_REGSAVE(greth->regs->status, GRETH_INT_RE | GRETH_INT_RX);
872 mb();
873 status = greth_read_bd(&bdp->stat);
874 bad = 0;
875
876 if (status & GRETH_BD_EN)
877 break;
878
879 /* Check status for errors. */
880 if (unlikely(status & GRETH_RXBD_STATUS)) {
881
882 if (status & GRETH_RXBD_ERR_FT) {
883 dev->stats.rx_length_errors++;
884 bad = 1;
885 } else if (status &
886 (GRETH_RXBD_ERR_AE | GRETH_RXBD_ERR_OE | GRETH_RXBD_ERR_LE)) {
887 dev->stats.rx_frame_errors++;
888 bad = 1;
889 } else if (status & GRETH_RXBD_ERR_CRC) {
890 dev->stats.rx_crc_errors++;
891 bad = 1;
892 }
893 }
894
895 /* Allocate new skb to replace current, not needed if the
896 * current skb can be reused */
897 if (!bad && (newskb=netdev_alloc_skb(dev, MAX_FRAME_SIZE + NET_IP_ALIGN))) {
898 skb_reserve(newskb, NET_IP_ALIGN);
899
900 dma_addr = dma_map_single(greth->dev,
901 newskb->data,
902 MAX_FRAME_SIZE + NET_IP_ALIGN,
903 DMA_FROM_DEVICE);
904
905 if (!dma_mapping_error(greth->dev, dma_addr)) {
906 /* Process the incoming frame. */
907 pkt_len = status & GRETH_BD_LEN;
908
909 dma_unmap_single(greth->dev,
910 greth_read_bd(&bdp->addr),
911 MAX_FRAME_SIZE + NET_IP_ALIGN,
912 DMA_FROM_DEVICE);
913
914 if (netif_msg_pktdata(greth))
915 greth_print_rx_packet(phys_to_virt(greth_read_bd(&bdp->addr)), pkt_len);
916
917 skb_put(skb, pkt_len);
918
919 if (dev->features & NETIF_F_RXCSUM && hw_checksummed(status))
920 skb->ip_summed = CHECKSUM_UNNECESSARY;
921 else
922 skb_checksum_none_assert(skb);
923
924 skb->protocol = eth_type_trans(skb, dev);
925 dev->stats.rx_packets++;
926 dev->stats.rx_bytes += pkt_len;
927 netif_receive_skb(skb);
928
929 greth->rx_skbuff[greth->rx_cur] = newskb;
930 greth_write_bd(&bdp->addr, dma_addr);
931 } else {
932 if (net_ratelimit())
933 dev_warn(greth->dev, "Could not create DMA mapping, dropping packet\n");
934 dev_kfree_skb(newskb);
935 /* reusing current skb, so it is a drop */
936 dev->stats.rx_dropped++;
937 }
938 } else if (bad) {
939 /* Bad Frame transfer, the skb is reused */
940 dev->stats.rx_dropped++;
941 } else {
942 /* Failed Allocating a new skb. This is rather stupid
943 * but the current "filled" skb is reused, as if
944 * transfer failure. One could argue that RX descriptor
945 * table handling should be divided into cleaning and
946 * filling as the TX part of the driver
947 */
948 if (net_ratelimit())
949 dev_warn(greth->dev, "Could not allocate SKB, dropping packet\n");
950 /* reusing current skb, so it is a drop */
951 dev->stats.rx_dropped++;
952 }
953
954 status = GRETH_BD_EN | GRETH_BD_IE;
955 if (greth->rx_cur == GRETH_RXBD_NUM_MASK) {
956 status |= GRETH_BD_WR;
957 }
958
959 wmb();
960 greth_write_bd(&bdp->stat, status);
961 spin_lock_irqsave(&greth->devlock, flags);
962 greth_enable_rx(greth);
963 spin_unlock_irqrestore(&greth->devlock, flags);
964 greth->rx_cur = NEXT_RX(greth->rx_cur);
965 }
966
967 return count;
968
969}
970
971static int greth_poll(struct napi_struct *napi, int budget)
972{
973 struct greth_private *greth;
974 int work_done = 0;
975 unsigned long flags;
976 u32 mask, ctrl;
977 greth = container_of(napi, struct greth_private, napi);
978
979restart_txrx_poll:
980 if (greth->gbit_mac) {
981 greth_clean_tx_gbit(greth->netdev);
982 work_done += greth_rx_gbit(greth->netdev, budget - work_done);
983 } else {
984 if (netif_queue_stopped(greth->netdev))
985 greth_clean_tx(greth->netdev);
986 work_done += greth_rx(greth->netdev, budget - work_done);
987 }
988
989 if (work_done < budget) {
990
991 spin_lock_irqsave(&greth->devlock, flags);
992
993 ctrl = GRETH_REGLOAD(greth->regs->control);
994 if ((greth->gbit_mac && (greth->tx_last != greth->tx_next)) ||
995 (!greth->gbit_mac && netif_queue_stopped(greth->netdev))) {
996 GRETH_REGSAVE(greth->regs->control,
997 ctrl | GRETH_TXI | GRETH_RXI);
998 mask = GRETH_INT_RX | GRETH_INT_RE |
999 GRETH_INT_TX | GRETH_INT_TE;
1000 } else {
1001 GRETH_REGSAVE(greth->regs->control, ctrl | GRETH_RXI);
1002 mask = GRETH_INT_RX | GRETH_INT_RE;
1003 }
1004
1005 if (GRETH_REGLOAD(greth->regs->status) & mask) {
1006 GRETH_REGSAVE(greth->regs->control, ctrl);
1007 spin_unlock_irqrestore(&greth->devlock, flags);
1008 goto restart_txrx_poll;
1009 } else {
1010 napi_complete_done(napi, work_done);
1011 spin_unlock_irqrestore(&greth->devlock, flags);
1012 }
1013 }
1014
1015 return work_done;
1016}
1017
1018static int greth_set_mac_add(struct net_device *dev, void *p)
1019{
1020 struct sockaddr *addr = p;
1021 struct greth_private *greth;
1022 struct greth_regs *regs;
1023
1024 greth = netdev_priv(dev);
1025 regs = greth->regs;
1026
1027 if (!is_valid_ether_addr(addr->sa_data))
1028 return -EADDRNOTAVAIL;
1029
1030 eth_hw_addr_set(dev, addr->sa_data);
1031 GRETH_REGSAVE(regs->esa_msb, dev->dev_addr[0] << 8 | dev->dev_addr[1]);
1032 GRETH_REGSAVE(regs->esa_lsb, dev->dev_addr[2] << 24 | dev->dev_addr[3] << 16 |
1033 dev->dev_addr[4] << 8 | dev->dev_addr[5]);
1034
1035 return 0;
1036}
1037
1038static u32 greth_hash_get_index(__u8 *addr)
1039{
1040 return (ether_crc(6, addr)) & 0x3F;
1041}
1042
1043static void greth_set_hash_filter(struct net_device *dev)
1044{
1045 struct netdev_hw_addr *ha;
1046 struct greth_private *greth = netdev_priv(dev);
1047 struct greth_regs *regs = greth->regs;
1048 u32 mc_filter[2];
1049 unsigned int bitnr;
1050
1051 mc_filter[0] = mc_filter[1] = 0;
1052
1053 netdev_for_each_mc_addr(ha, dev) {
1054 bitnr = greth_hash_get_index(ha->addr);
1055 mc_filter[bitnr >> 5] |= 1 << (bitnr & 31);
1056 }
1057
1058 GRETH_REGSAVE(regs->hash_msb, mc_filter[1]);
1059 GRETH_REGSAVE(regs->hash_lsb, mc_filter[0]);
1060}
1061
1062static void greth_set_multicast_list(struct net_device *dev)
1063{
1064 int cfg;
1065 struct greth_private *greth = netdev_priv(dev);
1066 struct greth_regs *regs = greth->regs;
1067
1068 cfg = GRETH_REGLOAD(regs->control);
1069 if (dev->flags & IFF_PROMISC)
1070 cfg |= GRETH_CTRL_PR;
1071 else
1072 cfg &= ~GRETH_CTRL_PR;
1073
1074 if (greth->multicast) {
1075 if (dev->flags & IFF_ALLMULTI) {
1076 GRETH_REGSAVE(regs->hash_msb, -1);
1077 GRETH_REGSAVE(regs->hash_lsb, -1);
1078 cfg |= GRETH_CTRL_MCEN;
1079 GRETH_REGSAVE(regs->control, cfg);
1080 return;
1081 }
1082
1083 if (netdev_mc_empty(dev)) {
1084 cfg &= ~GRETH_CTRL_MCEN;
1085 GRETH_REGSAVE(regs->control, cfg);
1086 return;
1087 }
1088
1089 /* Setup multicast filter */
1090 greth_set_hash_filter(dev);
1091 cfg |= GRETH_CTRL_MCEN;
1092 }
1093 GRETH_REGSAVE(regs->control, cfg);
1094}
1095
1096static u32 greth_get_msglevel(struct net_device *dev)
1097{
1098 struct greth_private *greth = netdev_priv(dev);
1099 return greth->msg_enable;
1100}
1101
1102static void greth_set_msglevel(struct net_device *dev, u32 value)
1103{
1104 struct greth_private *greth = netdev_priv(dev);
1105 greth->msg_enable = value;
1106}
1107
1108static int greth_get_regs_len(struct net_device *dev)
1109{
1110 return sizeof(struct greth_regs);
1111}
1112
1113static void greth_get_drvinfo(struct net_device *dev, struct ethtool_drvinfo *info)
1114{
1115 struct greth_private *greth = netdev_priv(dev);
1116
1117 strscpy(info->driver, dev_driver_string(greth->dev),
1118 sizeof(info->driver));
1119 strscpy(info->bus_info, greth->dev->bus->name, sizeof(info->bus_info));
1120}
1121
1122static void greth_get_regs(struct net_device *dev, struct ethtool_regs *regs, void *p)
1123{
1124 int i;
1125 struct greth_private *greth = netdev_priv(dev);
1126 u32 __iomem *greth_regs = (u32 __iomem *) greth->regs;
1127 u32 *buff = p;
1128
1129 for (i = 0; i < sizeof(struct greth_regs) / sizeof(u32); i++)
1130 buff[i] = greth_read_bd(&greth_regs[i]);
1131}
1132
1133static const struct ethtool_ops greth_ethtool_ops = {
1134 .get_msglevel = greth_get_msglevel,
1135 .set_msglevel = greth_set_msglevel,
1136 .get_drvinfo = greth_get_drvinfo,
1137 .get_regs_len = greth_get_regs_len,
1138 .get_regs = greth_get_regs,
1139 .get_link = ethtool_op_get_link,
1140 .get_link_ksettings = phy_ethtool_get_link_ksettings,
1141 .set_link_ksettings = phy_ethtool_set_link_ksettings,
1142};
1143
1144static struct net_device_ops greth_netdev_ops = {
1145 .ndo_open = greth_open,
1146 .ndo_stop = greth_close,
1147 .ndo_start_xmit = greth_start_xmit,
1148 .ndo_set_mac_address = greth_set_mac_add,
1149 .ndo_validate_addr = eth_validate_addr,
1150};
1151
1152static inline int wait_for_mdio(struct greth_private *greth)
1153{
1154 unsigned long timeout = jiffies + 4*HZ/100;
1155 while (GRETH_REGLOAD(greth->regs->mdio) & GRETH_MII_BUSY) {
1156 if (time_after(jiffies, timeout))
1157 return 0;
1158 }
1159 return 1;
1160}
1161
1162static int greth_mdio_read(struct mii_bus *bus, int phy, int reg)
1163{
1164 struct greth_private *greth = bus->priv;
1165 int data;
1166
1167 if (!wait_for_mdio(greth))
1168 return -EBUSY;
1169
1170 GRETH_REGSAVE(greth->regs->mdio, ((phy & 0x1F) << 11) | ((reg & 0x1F) << 6) | 2);
1171
1172 if (!wait_for_mdio(greth))
1173 return -EBUSY;
1174
1175 if (!(GRETH_REGLOAD(greth->regs->mdio) & GRETH_MII_NVALID)) {
1176 data = (GRETH_REGLOAD(greth->regs->mdio) >> 16) & 0xFFFF;
1177 return data;
1178
1179 } else {
1180 return -1;
1181 }
1182}
1183
1184static int greth_mdio_write(struct mii_bus *bus, int phy, int reg, u16 val)
1185{
1186 struct greth_private *greth = bus->priv;
1187
1188 if (!wait_for_mdio(greth))
1189 return -EBUSY;
1190
1191 GRETH_REGSAVE(greth->regs->mdio,
1192 ((val & 0xFFFF) << 16) | ((phy & 0x1F) << 11) | ((reg & 0x1F) << 6) | 1);
1193
1194 if (!wait_for_mdio(greth))
1195 return -EBUSY;
1196
1197 return 0;
1198}
1199
1200static void greth_link_change(struct net_device *dev)
1201{
1202 struct greth_private *greth = netdev_priv(dev);
1203 struct phy_device *phydev = dev->phydev;
1204 unsigned long flags;
1205 int status_change = 0;
1206 u32 ctrl;
1207
1208 spin_lock_irqsave(&greth->devlock, flags);
1209
1210 if (phydev->link) {
1211
1212 if ((greth->speed != phydev->speed) || (greth->duplex != phydev->duplex)) {
1213 ctrl = GRETH_REGLOAD(greth->regs->control) &
1214 ~(GRETH_CTRL_FD | GRETH_CTRL_SP | GRETH_CTRL_GB);
1215
1216 if (phydev->duplex)
1217 ctrl |= GRETH_CTRL_FD;
1218
1219 if (phydev->speed == SPEED_100)
1220 ctrl |= GRETH_CTRL_SP;
1221 else if (phydev->speed == SPEED_1000)
1222 ctrl |= GRETH_CTRL_GB;
1223
1224 GRETH_REGSAVE(greth->regs->control, ctrl);
1225 greth->speed = phydev->speed;
1226 greth->duplex = phydev->duplex;
1227 status_change = 1;
1228 }
1229 }
1230
1231 if (phydev->link != greth->link) {
1232 if (!phydev->link) {
1233 greth->speed = 0;
1234 greth->duplex = -1;
1235 }
1236 greth->link = phydev->link;
1237
1238 status_change = 1;
1239 }
1240
1241 spin_unlock_irqrestore(&greth->devlock, flags);
1242
1243 if (status_change) {
1244 if (phydev->link)
1245 pr_debug("%s: link up (%d/%s)\n",
1246 dev->name, phydev->speed,
1247 DUPLEX_FULL == phydev->duplex ? "Full" : "Half");
1248 else
1249 pr_debug("%s: link down\n", dev->name);
1250 }
1251}
1252
1253static int greth_mdio_probe(struct net_device *dev)
1254{
1255 struct greth_private *greth = netdev_priv(dev);
1256 struct phy_device *phy = NULL;
1257 int ret;
1258
1259 /* Find the first PHY */
1260 phy = phy_find_first(greth->mdio);
1261
1262 if (!phy) {
1263 if (netif_msg_probe(greth))
1264 dev_err(&dev->dev, "no PHY found\n");
1265 return -ENXIO;
1266 }
1267
1268 ret = phy_connect_direct(dev, phy, &greth_link_change,
1269 greth->gbit_mac ? PHY_INTERFACE_MODE_GMII : PHY_INTERFACE_MODE_MII);
1270 if (ret) {
1271 if (netif_msg_ifup(greth))
1272 dev_err(&dev->dev, "could not attach to PHY\n");
1273 return ret;
1274 }
1275
1276 if (greth->gbit_mac)
1277 phy_set_max_speed(phy, SPEED_1000);
1278 else
1279 phy_set_max_speed(phy, SPEED_100);
1280
1281 linkmode_copy(phy->advertising, phy->supported);
1282
1283 greth->link = 0;
1284 greth->speed = 0;
1285 greth->duplex = -1;
1286
1287 return 0;
1288}
1289
1290static int greth_mdio_init(struct greth_private *greth)
1291{
1292 int ret;
1293 unsigned long timeout;
1294 struct net_device *ndev = greth->netdev;
1295
1296 greth->mdio = mdiobus_alloc();
1297 if (!greth->mdio) {
1298 return -ENOMEM;
1299 }
1300
1301 greth->mdio->name = "greth-mdio";
1302 snprintf(greth->mdio->id, MII_BUS_ID_SIZE, "%s-%d", greth->mdio->name, greth->irq);
1303 greth->mdio->read = greth_mdio_read;
1304 greth->mdio->write = greth_mdio_write;
1305 greth->mdio->priv = greth;
1306
1307 ret = mdiobus_register(greth->mdio);
1308 if (ret) {
1309 goto error;
1310 }
1311
1312 ret = greth_mdio_probe(greth->netdev);
1313 if (ret) {
1314 if (netif_msg_probe(greth))
1315 dev_err(&greth->netdev->dev, "failed to probe MDIO bus\n");
1316 goto unreg_mdio;
1317 }
1318
1319 phy_start(ndev->phydev);
1320
1321 /* If Ethernet debug link is used make autoneg happen right away */
1322 if (greth->edcl && greth_edcl == 1) {
1323 phy_start_aneg(ndev->phydev);
1324 timeout = jiffies + 6*HZ;
1325 while (!phy_aneg_done(ndev->phydev) &&
1326 time_before(jiffies, timeout)) {
1327 }
1328 phy_read_status(ndev->phydev);
1329 greth_link_change(greth->netdev);
1330 }
1331
1332 return 0;
1333
1334unreg_mdio:
1335 mdiobus_unregister(greth->mdio);
1336error:
1337 mdiobus_free(greth->mdio);
1338 return ret;
1339}
1340
1341/* Initialize the GRETH MAC */
1342static int greth_of_probe(struct platform_device *ofdev)
1343{
1344 struct net_device *dev;
1345 struct greth_private *greth;
1346 struct greth_regs *regs;
1347
1348 int i;
1349 int err;
1350 int tmp;
1351 u8 addr[ETH_ALEN];
1352 unsigned long timeout;
1353
1354 dev = alloc_etherdev(sizeof(struct greth_private));
1355
1356 if (dev == NULL)
1357 return -ENOMEM;
1358
1359 greth = netdev_priv(dev);
1360 greth->netdev = dev;
1361 greth->dev = &ofdev->dev;
1362
1363 if (greth_debug > 0)
1364 greth->msg_enable = greth_debug;
1365 else
1366 greth->msg_enable = GRETH_DEF_MSG_ENABLE;
1367
1368 spin_lock_init(&greth->devlock);
1369
1370 greth->regs = of_ioremap(&ofdev->resource[0], 0,
1371 resource_size(&ofdev->resource[0]),
1372 "grlib-greth regs");
1373
1374 if (greth->regs == NULL) {
1375 if (netif_msg_probe(greth))
1376 dev_err(greth->dev, "ioremap failure.\n");
1377 err = -EIO;
1378 goto error1;
1379 }
1380
1381 regs = greth->regs;
1382 greth->irq = ofdev->archdata.irqs[0];
1383
1384 dev_set_drvdata(greth->dev, dev);
1385 SET_NETDEV_DEV(dev, greth->dev);
1386
1387 if (netif_msg_probe(greth))
1388 dev_dbg(greth->dev, "resetting controller.\n");
1389
1390 /* Reset the controller. */
1391 GRETH_REGSAVE(regs->control, GRETH_RESET);
1392
1393 /* Wait for MAC to reset itself */
1394 timeout = jiffies + HZ/100;
1395 while (GRETH_REGLOAD(regs->control) & GRETH_RESET) {
1396 if (time_after(jiffies, timeout)) {
1397 err = -EIO;
1398 if (netif_msg_probe(greth))
1399 dev_err(greth->dev, "timeout when waiting for reset.\n");
1400 goto error2;
1401 }
1402 }
1403
1404 /* Get default PHY address */
1405 greth->phyaddr = (GRETH_REGLOAD(regs->mdio) >> 11) & 0x1F;
1406
1407 /* Check if we have GBIT capable MAC */
1408 tmp = GRETH_REGLOAD(regs->control);
1409 greth->gbit_mac = (tmp >> 27) & 1;
1410
1411 /* Check for multicast capability */
1412 greth->multicast = (tmp >> 25) & 1;
1413
1414 greth->edcl = (tmp >> 31) & 1;
1415
1416 /* If we have EDCL we disable the EDCL speed-duplex FSM so
1417 * it doesn't interfere with the software */
1418 if (greth->edcl != 0)
1419 GRETH_REGORIN(regs->control, GRETH_CTRL_DISDUPLEX);
1420
1421 /* Check if MAC can handle MDIO interrupts */
1422 greth->mdio_int_en = (tmp >> 26) & 1;
1423
1424 err = greth_mdio_init(greth);
1425 if (err) {
1426 if (netif_msg_probe(greth))
1427 dev_err(greth->dev, "failed to register MDIO bus\n");
1428 goto error2;
1429 }
1430
1431 /* Allocate TX descriptor ring in coherent memory */
1432 greth->tx_bd_base = dma_alloc_coherent(greth->dev, 1024,
1433 &greth->tx_bd_base_phys,
1434 GFP_KERNEL);
1435 if (!greth->tx_bd_base) {
1436 err = -ENOMEM;
1437 goto error3;
1438 }
1439
1440 /* Allocate RX descriptor ring in coherent memory */
1441 greth->rx_bd_base = dma_alloc_coherent(greth->dev, 1024,
1442 &greth->rx_bd_base_phys,
1443 GFP_KERNEL);
1444 if (!greth->rx_bd_base) {
1445 err = -ENOMEM;
1446 goto error4;
1447 }
1448
1449 /* Get MAC address from: module param, OF property or ID prom */
1450 for (i = 0; i < 6; i++) {
1451 if (macaddr[i] != 0)
1452 break;
1453 }
1454 if (i == 6) {
1455 err = of_get_mac_address(ofdev->dev.of_node, addr);
1456 if (!err) {
1457 for (i = 0; i < 6; i++)
1458 macaddr[i] = (unsigned int) addr[i];
1459 } else {
1460#ifdef CONFIG_SPARC
1461 for (i = 0; i < 6; i++)
1462 macaddr[i] = (unsigned int) idprom->id_ethaddr[i];
1463#endif
1464 }
1465 }
1466
1467 for (i = 0; i < 6; i++)
1468 addr[i] = macaddr[i];
1469 eth_hw_addr_set(dev, addr);
1470
1471 macaddr[5]++;
1472
1473 if (!is_valid_ether_addr(&dev->dev_addr[0])) {
1474 if (netif_msg_probe(greth))
1475 dev_err(greth->dev, "no valid ethernet address, aborting.\n");
1476 err = -EINVAL;
1477 goto error5;
1478 }
1479
1480 GRETH_REGSAVE(regs->esa_msb, dev->dev_addr[0] << 8 | dev->dev_addr[1]);
1481 GRETH_REGSAVE(regs->esa_lsb, dev->dev_addr[2] << 24 | dev->dev_addr[3] << 16 |
1482 dev->dev_addr[4] << 8 | dev->dev_addr[5]);
1483
1484 /* Clear all pending interrupts except PHY irq */
1485 GRETH_REGSAVE(regs->status, 0xFF);
1486
1487 if (greth->gbit_mac) {
1488 dev->hw_features = NETIF_F_SG | NETIF_F_IP_CSUM |
1489 NETIF_F_RXCSUM;
1490 dev->features = dev->hw_features | NETIF_F_HIGHDMA;
1491 greth_netdev_ops.ndo_start_xmit = greth_start_xmit_gbit;
1492 }
1493
1494 if (greth->multicast) {
1495 greth_netdev_ops.ndo_set_rx_mode = greth_set_multicast_list;
1496 dev->flags |= IFF_MULTICAST;
1497 } else {
1498 dev->flags &= ~IFF_MULTICAST;
1499 }
1500
1501 dev->netdev_ops = &greth_netdev_ops;
1502 dev->ethtool_ops = &greth_ethtool_ops;
1503
1504 err = register_netdev(dev);
1505 if (err) {
1506 if (netif_msg_probe(greth))
1507 dev_err(greth->dev, "netdevice registration failed.\n");
1508 goto error5;
1509 }
1510
1511 /* setup NAPI */
1512 netif_napi_add(dev, &greth->napi, greth_poll);
1513
1514 return 0;
1515
1516error5:
1517 dma_free_coherent(greth->dev, 1024, greth->rx_bd_base, greth->rx_bd_base_phys);
1518error4:
1519 dma_free_coherent(greth->dev, 1024, greth->tx_bd_base, greth->tx_bd_base_phys);
1520error3:
1521 mdiobus_unregister(greth->mdio);
1522error2:
1523 of_iounmap(&ofdev->resource[0], greth->regs, resource_size(&ofdev->resource[0]));
1524error1:
1525 free_netdev(dev);
1526 return err;
1527}
1528
1529static void greth_of_remove(struct platform_device *of_dev)
1530{
1531 struct net_device *ndev = platform_get_drvdata(of_dev);
1532 struct greth_private *greth = netdev_priv(ndev);
1533
1534 /* Free descriptor areas */
1535 dma_free_coherent(&of_dev->dev, 1024, greth->rx_bd_base, greth->rx_bd_base_phys);
1536
1537 dma_free_coherent(&of_dev->dev, 1024, greth->tx_bd_base, greth->tx_bd_base_phys);
1538
1539 if (ndev->phydev)
1540 phy_stop(ndev->phydev);
1541 mdiobus_unregister(greth->mdio);
1542
1543 unregister_netdev(ndev);
1544
1545 of_iounmap(&of_dev->resource[0], greth->regs, resource_size(&of_dev->resource[0]));
1546
1547 free_netdev(ndev);
1548}
1549
1550static const struct of_device_id greth_of_match[] = {
1551 {
1552 .name = "GAISLER_ETHMAC",
1553 },
1554 {
1555 .name = "01_01d",
1556 },
1557 {},
1558};
1559
1560MODULE_DEVICE_TABLE(of, greth_of_match);
1561
1562static struct platform_driver greth_of_driver = {
1563 .driver = {
1564 .name = "grlib-greth",
1565 .of_match_table = greth_of_match,
1566 },
1567 .probe = greth_of_probe,
1568 .remove = greth_of_remove,
1569};
1570
1571module_platform_driver(greth_of_driver);
1572
1573MODULE_AUTHOR("Aeroflex Gaisler AB.");
1574MODULE_DESCRIPTION("Aeroflex Gaisler Ethernet MAC driver");
1575MODULE_LICENSE("GPL");
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
58static int greth_debug = -1; /* -1 == use GRETH_DEF_MSG_ENABLE as value */
59module_param(greth_debug, int, 0);
60MODULE_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 */
63static int macaddr[6];
64module_param_array(macaddr, int, NULL, 0);
65MODULE_PARM_DESC(macaddr, "GRETH Ethernet MAC address");
66
67static int greth_edcl = 1;
68module_param(greth_edcl, int, 0);
69MODULE_PARM_DESC(greth_edcl, "GRETH EDCL usage indicator. Set to 1 if EDCL is used.");
70
71static int greth_open(struct net_device *dev);
72static netdev_tx_t greth_start_xmit(struct sk_buff *skb,
73 struct net_device *dev);
74static netdev_tx_t greth_start_xmit_gbit(struct sk_buff *skb,
75 struct net_device *dev);
76static int greth_rx(struct net_device *dev, int limit);
77static int greth_rx_gbit(struct net_device *dev, int limit);
78static void greth_clean_tx(struct net_device *dev);
79static void greth_clean_tx_gbit(struct net_device *dev);
80static irqreturn_t greth_interrupt(int irq, void *dev_id);
81static int greth_close(struct net_device *dev);
82static int greth_set_mac_add(struct net_device *dev, void *p);
83static 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
94static 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
100static 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
121static inline void greth_enable_tx(struct greth_private *greth)
122{
123 wmb();
124 GRETH_REGORIN(greth->regs->control, GRETH_TXEN);
125}
126
127static inline void greth_disable_tx(struct greth_private *greth)
128{
129 GRETH_REGANDIN(greth->regs->control, ~GRETH_TXEN);
130}
131
132static inline void greth_enable_rx(struct greth_private *greth)
133{
134 wmb();
135 GRETH_REGORIN(greth->regs->control, GRETH_RXEN);
136}
137
138static inline void greth_disable_rx(struct greth_private *greth)
139{
140 GRETH_REGANDIN(greth->regs->control, ~GRETH_RXEN);
141}
142
143static inline void greth_enable_irqs(struct greth_private *greth)
144{
145 GRETH_REGORIN(greth->regs->control, GRETH_RXI | GRETH_TXI);
146}
147
148static inline void greth_disable_irqs(struct greth_private *greth)
149{
150 GRETH_REGANDIN(greth->regs->control, ~(GRETH_RXI|GRETH_TXI));
151}
152
153static inline void greth_write_bd(u32 *bd, u32 val)
154{
155 __raw_writel(cpu_to_be32(val), bd);
156}
157
158static inline u32 greth_read_bd(u32 *bd)
159{
160 return be32_to_cpu(__raw_readl(bd));
161}
162
163static 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
230static 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
331cleanup:
332 greth_clean_rings(greth);
333 return -ENOMEM;
334}
335
336static 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
371static 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
390static netdev_tx_t
391greth_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
446out:
447 dev_kfree_skb(skb);
448 return err;
449}
450
451
452static netdev_tx_t
453greth_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
561frag_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 }
571map_error:
572 if (net_ratelimit())
573 dev_warn(greth->dev, "Could not create TX DMA mapping\n");
574 dev_kfree_skb(skb);
575out:
576 return err;
577}
578
579static 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
615static 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
655static 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
670static 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
729static 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
826static 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
844static 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
960static 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
968restart_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
1010static 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 = (struct greth_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
1030static u32 greth_hash_get_index(__u8 *addr)
1031{
1032 return (ether_crc(6, addr)) & 0x3F;
1033}
1034
1035static 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 = (struct greth_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
1054static 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 = (struct greth_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
1088static u32 greth_get_msglevel(struct net_device *dev)
1089{
1090 struct greth_private *greth = netdev_priv(dev);
1091 return greth->msg_enable;
1092}
1093
1094static 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}
1099static 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
1110static 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
1121static int greth_get_regs_len(struct net_device *dev)
1122{
1123 return sizeof(struct greth_regs);
1124}
1125
1126static 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
1138static 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
1149static 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
1160static 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
1168static 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
1178static 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
1200static 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
1216static int greth_mdio_reset(struct mii_bus *bus)
1217{
1218 return 0;
1219}
1220
1221static 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
1274static 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
1314static 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
1323static 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
1371unreg_mdio:
1372 mdiobus_unregister(greth->mdio);
1373error:
1374 mdiobus_free(greth->mdio);
1375 return ret;
1376}
1377
1378/* Initialize the GRETH MAC */
1379static 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 = (struct greth_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
1566error5:
1567 dma_free_coherent(greth->dev, 1024, greth->rx_bd_base, greth->rx_bd_base_phys);
1568error4:
1569 dma_free_coherent(greth->dev, 1024, greth->tx_bd_base, greth->tx_bd_base_phys);
1570error3:
1571 mdiobus_unregister(greth->mdio);
1572error2:
1573 of_iounmap(&ofdev->resource[0], greth->regs, resource_size(&ofdev->resource[0]));
1574error1:
1575 free_netdev(dev);
1576 return err;
1577}
1578
1579static 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
1603static struct of_device_id greth_of_match[] = {
1604 {
1605 .name = "GAISLER_ETHMAC",
1606 },
1607 {
1608 .name = "01_01d",
1609 },
1610 {},
1611};
1612
1613MODULE_DEVICE_TABLE(of, greth_of_match);
1614
1615static 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
1625module_platform_driver(greth_of_driver);
1626
1627MODULE_AUTHOR("Aeroflex Gaisler AB.");
1628MODULE_DESCRIPTION("Aeroflex Gaisler Ethernet MAC driver");
1629MODULE_LICENSE("GPL");