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fs: use kmem_cache_zalloc instead
[pv_ops_mirror.git] / drivers / net / bfin_mac.c
blob53fe7ded5d509275b0827891f4551d376e6b749d
1 /*
2 * File: drivers/net/bfin_mac.c
3 * Based on:
4 * Maintainer:
5 * Bryan Wu <bryan.wu@analog.com>
6 *
7 * Original author:
8 * Luke Yang <luke.yang@analog.com>
9 *
10 * Created:
11 * Description:
12 *
13 * Modified:
14 * Copyright 2004-2006 Analog Devices Inc.
15 *
16 * Bugs: Enter bugs at http://blackfin.uclinux.org/
17 *
18 * This program is free software ; you can redistribute it and/or modify
19 * it under the terms of the GNU General Public License as published by
20 * the Free Software Foundation ; either version 2, or (at your option)
21 * any later version.
22 *
23 * This program is distributed in the hope that it will be useful,
24 * but WITHOUT ANY WARRANTY ; without even the implied warranty of
25 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
26 * GNU General Public License for more details.
27 *
28 * You should have received a copy of the GNU General Public License
29 * along with this program ; see the file COPYING.
30 * If not, write to the Free Software Foundation,
31 * 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
32 */
33
34 #include <linux/init.h>
35 #include <linux/module.h>
36 #include <linux/kernel.h>
37 #include <linux/sched.h>
38 #include <linux/slab.h>
39 #include <linux/delay.h>
40 #include <linux/timer.h>
41 #include <linux/errno.h>
42 #include <linux/irq.h>
43 #include <linux/io.h>
44 #include <linux/ioport.h>
45 #include <linux/crc32.h>
46 #include <linux/device.h>
47 #include <linux/spinlock.h>
48 #include <linux/ethtool.h>
49 #include <linux/mii.h>
50 #include <linux/phy.h>
51 #include <linux/netdevice.h>
52 #include <linux/etherdevice.h>
53 #include <linux/skbuff.h>
54 #include <linux/platform_device.h>
55
56 #include <asm/dma.h>
57 #include <linux/dma-mapping.h>
58
59 #include <asm/blackfin.h>
60 #include <asm/cacheflush.h>
61 #include <asm/portmux.h>
62
63 #include "bfin_mac.h"
64
65 #define DRV_NAME "bfin_mac"
66 #define DRV_VERSION "1.1"
67 #define DRV_AUTHOR "Bryan Wu, Luke Yang"
68 #define DRV_DESC "Blackfin BF53[67] on-chip Ethernet MAC driver"
69
70 MODULE_AUTHOR(DRV_AUTHOR);
71 MODULE_LICENSE("GPL");
72 MODULE_DESCRIPTION(DRV_DESC);
73
74 #if defined(CONFIG_BFIN_MAC_USE_L1)
75 # define bfin_mac_alloc(dma_handle, size) l1_data_sram_zalloc(size)
76 # define bfin_mac_free(dma_handle, ptr) l1_data_sram_free(ptr)
77 #else
78 # define bfin_mac_alloc(dma_handle, size) \
79 dma_alloc_coherent(NULL, size, dma_handle, GFP_KERNEL)
80 # define bfin_mac_free(dma_handle, ptr) \
81 dma_free_coherent(NULL, sizeof(*ptr), ptr, dma_handle)
82 #endif
83
84 #define PKT_BUF_SZ 1580
85
86 #define MAX_TIMEOUT_CNT 500
87
88 /* pointers to maintain transmit list */
89 static struct net_dma_desc_tx *tx_list_head;
90 static struct net_dma_desc_tx *tx_list_tail;
91 static struct net_dma_desc_rx *rx_list_head;
92 static struct net_dma_desc_rx *rx_list_tail;
93 static struct net_dma_desc_rx *current_rx_ptr;
94 static struct net_dma_desc_tx *current_tx_ptr;
95 static struct net_dma_desc_tx *tx_desc;
96 static struct net_dma_desc_rx *rx_desc;
97
98 static void bf537mac_disable(void);
99 static void bf537mac_enable(void);
100
101 static void desc_list_free(void)
102 {
103 struct net_dma_desc_rx *r;
104 struct net_dma_desc_tx *t;
105 int i;
106 #if !defined(CONFIG_BFIN_MAC_USE_L1)
107 dma_addr_t dma_handle = 0;
108 #endif
109
110 if (tx_desc) {
111 t = tx_list_head;
112 for (i = 0; i < CONFIG_BFIN_TX_DESC_NUM; i++) {
113 if (t) {
114 if (t->skb) {
115 dev_kfree_skb(t->skb);
116 t->skb = NULL;
117 }
118 t = t->next;
119 }
120 }
121 bfin_mac_free(dma_handle, tx_desc);
122 }
123
124 if (rx_desc) {
125 r = rx_list_head;
126 for (i = 0; i < CONFIG_BFIN_RX_DESC_NUM; i++) {
127 if (r) {
128 if (r->skb) {
129 dev_kfree_skb(r->skb);
130 r->skb = NULL;
131 }
132 r = r->next;
133 }
134 }
135 bfin_mac_free(dma_handle, rx_desc);
136 }
137 }
138
139 static int desc_list_init(void)
140 {
141 int i;
142 struct sk_buff *new_skb;
143 #if !defined(CONFIG_BFIN_MAC_USE_L1)
144 /*
145 * This dma_handle is useless in Blackfin dma_alloc_coherent().
146 * The real dma handler is the return value of dma_alloc_coherent().
147 */
148 dma_addr_t dma_handle;
149 #endif
150
151 tx_desc = bfin_mac_alloc(&dma_handle,
152 sizeof(struct net_dma_desc_tx) *
153 CONFIG_BFIN_TX_DESC_NUM);
154 if (tx_desc == NULL)
155 goto init_error;
156
157 rx_desc = bfin_mac_alloc(&dma_handle,
158 sizeof(struct net_dma_desc_rx) *
159 CONFIG_BFIN_RX_DESC_NUM);
160 if (rx_desc == NULL)
161 goto init_error;
162
163 /* init tx_list */
164 tx_list_head = tx_list_tail = tx_desc;
165
166 for (i = 0; i < CONFIG_BFIN_TX_DESC_NUM; i++) {
167 struct net_dma_desc_tx *t = tx_desc + i;
168 struct dma_descriptor *a = &(t->desc_a);
169 struct dma_descriptor *b = &(t->desc_b);
170
171 /*
172 * disable DMA
173 * read from memory WNR = 0
174 * wordsize is 32 bits
175 * 6 half words is desc size
176 * large desc flow
177 */
178 a->config = WDSIZE_32 | NDSIZE_6 | DMAFLOW_LARGE;
179 a->start_addr = (unsigned long)t->packet;
180 a->x_count = 0;
181 a->next_dma_desc = b;
182
183 /*
184 * enabled DMA
185 * write to memory WNR = 1
186 * wordsize is 32 bits
187 * disable interrupt
188 * 6 half words is desc size
189 * large desc flow
190 */
191 b->config = DMAEN | WNR | WDSIZE_32 | NDSIZE_6 | DMAFLOW_LARGE;
192 b->start_addr = (unsigned long)(&(t->status));
193 b->x_count = 0;
194
195 t->skb = NULL;
196 tx_list_tail->desc_b.next_dma_desc = a;
197 tx_list_tail->next = t;
198 tx_list_tail = t;
199 }
200 tx_list_tail->next = tx_list_head; /* tx_list is a circle */
201 tx_list_tail->desc_b.next_dma_desc = &(tx_list_head->desc_a);
202 current_tx_ptr = tx_list_head;
203
204 /* init rx_list */
205 rx_list_head = rx_list_tail = rx_desc;
206
207 for (i = 0; i < CONFIG_BFIN_RX_DESC_NUM; i++) {
208 struct net_dma_desc_rx *r = rx_desc + i;
209 struct dma_descriptor *a = &(r->desc_a);
210 struct dma_descriptor *b = &(r->desc_b);
211
212 /* allocate a new skb for next time receive */
213 new_skb = dev_alloc_skb(PKT_BUF_SZ + 2);
214 if (!new_skb) {
215 printk(KERN_NOTICE DRV_NAME
216 ": init: low on mem - packet dropped\n");
217 goto init_error;
218 }
219 skb_reserve(new_skb, 2);
220 r->skb = new_skb;
221
222 /*
223 * enabled DMA
224 * write to memory WNR = 1
225 * wordsize is 32 bits
226 * disable interrupt
227 * 6 half words is desc size
228 * large desc flow
229 */
230 a->config = DMAEN | WNR | WDSIZE_32 | NDSIZE_6 | DMAFLOW_LARGE;
231 /* since RXDWA is enabled */
232 a->start_addr = (unsigned long)new_skb->data - 2;
233 a->x_count = 0;
234 a->next_dma_desc = b;
235
236 /*
237 * enabled DMA
238 * write to memory WNR = 1
239 * wordsize is 32 bits
240 * enable interrupt
241 * 6 half words is desc size
242 * large desc flow
243 */
244 b->config = DMAEN | WNR | WDSIZE_32 | DI_EN |
245 NDSIZE_6 | DMAFLOW_LARGE;
246 b->start_addr = (unsigned long)(&(r->status));
247 b->x_count = 0;
248
249 rx_list_tail->desc_b.next_dma_desc = a;
250 rx_list_tail->next = r;
251 rx_list_tail = r;
252 }
253 rx_list_tail->next = rx_list_head; /* rx_list is a circle */
254 rx_list_tail->desc_b.next_dma_desc = &(rx_list_head->desc_a);
255 current_rx_ptr = rx_list_head;
256
257 return 0;
258
259 init_error:
260 desc_list_free();
261 printk(KERN_ERR DRV_NAME ": kmalloc failed\n");
262 return -ENOMEM;
263 }
264
265
266 /*---PHY CONTROL AND CONFIGURATION-----------------------------------------*/
267
268 /* Set FER regs to MUX in Ethernet pins */
269 static int setup_pin_mux(int action)
270 {
271 #if defined(CONFIG_BFIN_MAC_RMII)
272 u16 pin_req[] = P_RMII0;
273 #else
274 u16 pin_req[] = P_MII0;
275 #endif
276
277 if (action) {
278 if (peripheral_request_list(pin_req, DRV_NAME)) {
279 printk(KERN_ERR DRV_NAME
280 ": Requesting Peripherals failed\n");
281 return -EFAULT;
282 }
283 } else
284 peripheral_free_list(pin_req);
285
286 return 0;
287 }
288
289 /*
290 * MII operations
291 */
292 /* Wait until the previous MDC/MDIO transaction has completed */
293 static void mdio_poll(void)
294 {
295 int timeout_cnt = MAX_TIMEOUT_CNT;
296
297 /* poll the STABUSY bit */
298 while ((bfin_read_EMAC_STAADD()) & STABUSY) {
299 mdelay(10);
300 if (timeout_cnt-- < 0) {
301 printk(KERN_ERR DRV_NAME
302 ": wait MDC/MDIO transaction to complete timeout\n");
303 break;
304 }
305 }
306 }
307
308 /* Read an off-chip register in a PHY through the MDC/MDIO port */
309 static int mdiobus_read(struct mii_bus *bus, int phy_addr, int regnum)
310 {
311 mdio_poll();
312
313 /* read mode */
314 bfin_write_EMAC_STAADD(SET_PHYAD((u16) phy_addr) |
315 SET_REGAD((u16) regnum) |
316 STABUSY);
317
318 mdio_poll();
319
320 return (int) bfin_read_EMAC_STADAT();
321 }
322
323 /* Write an off-chip register in a PHY through the MDC/MDIO port */
324 static int mdiobus_write(struct mii_bus *bus, int phy_addr, int regnum,
325 u16 value)
326 {
327 mdio_poll();
328
329 bfin_write_EMAC_STADAT((u32) value);
330
331 /* write mode */
332 bfin_write_EMAC_STAADD(SET_PHYAD((u16) phy_addr) |
333 SET_REGAD((u16) regnum) |
334 STAOP |
335 STABUSY);
336
337 mdio_poll();
338
339 return 0;
340 }
341
342 static int mdiobus_reset(struct mii_bus *bus)
343 {
344 return 0;
345 }
346
347 static void bf537_adjust_link(struct net_device *dev)
348 {
349 struct bf537mac_local *lp = netdev_priv(dev);
350 struct phy_device *phydev = lp->phydev;
351 unsigned long flags;
352 int new_state = 0;
353
354 spin_lock_irqsave(&lp->lock, flags);
355 if (phydev->link) {
356 /* Now we make sure that we can be in full duplex mode.
357 * If not, we operate in half-duplex mode. */
358 if (phydev->duplex != lp->old_duplex) {
359 u32 opmode = bfin_read_EMAC_OPMODE();
360 new_state = 1;
361
362 if (phydev->duplex)
363 opmode |= FDMODE;
364 else
365 opmode &= ~(FDMODE);
366
367 bfin_write_EMAC_OPMODE(opmode);
368 lp->old_duplex = phydev->duplex;
369 }
370
371 if (phydev->speed != lp->old_speed) {
372 #if defined(CONFIG_BFIN_MAC_RMII)
373 u32 opmode = bfin_read_EMAC_OPMODE();
374 bf537mac_disable();
375 switch (phydev->speed) {
376 case 10:
377 opmode |= RMII_10;
378 break;
379 case 100:
380 opmode &= ~(RMII_10);
381 break;
382 default:
383 printk(KERN_WARNING
384 "%s: Ack! Speed (%d) is not 10/100!\n",
385 DRV_NAME, phydev->speed);
386 break;
387 }
388 bfin_write_EMAC_OPMODE(opmode);
389 bf537mac_enable();
390 #endif
391
392 new_state = 1;
393 lp->old_speed = phydev->speed;
394 }
395
396 if (!lp->old_link) {
397 new_state = 1;
398 lp->old_link = 1;
399 netif_schedule(dev);
400 }
401 } else if (lp->old_link) {
402 new_state = 1;
403 lp->old_link = 0;
404 lp->old_speed = 0;
405 lp->old_duplex = -1;
406 }
407
408 if (new_state) {
409 u32 opmode = bfin_read_EMAC_OPMODE();
410 phy_print_status(phydev);
411 pr_debug("EMAC_OPMODE = 0x%08x\n", opmode);
412 }
413
414 spin_unlock_irqrestore(&lp->lock, flags);
415 }
416
417 static int mii_probe(struct net_device *dev)
418 {
419 struct bf537mac_local *lp = netdev_priv(dev);
420 struct phy_device *phydev = NULL;
421 unsigned short sysctl;
422 int i;
423
424 /* Enable PHY output early */
425 if (!(bfin_read_VR_CTL() & PHYCLKOE))
426 bfin_write_VR_CTL(bfin_read_VR_CTL() | PHYCLKOE);
427
428 /* MDC = 2.5 MHz */
429 sysctl = bfin_read_EMAC_SYSCTL();
430 sysctl |= SET_MDCDIV(24);
431 bfin_write_EMAC_SYSCTL(sysctl);
432
433 /* search for connect PHY device */
434 for (i = 0; i < PHY_MAX_ADDR; i++) {
435 struct phy_device *const tmp_phydev = lp->mii_bus.phy_map[i];
436
437 if (!tmp_phydev)
438 continue; /* no PHY here... */
439
440 phydev = tmp_phydev;
441 break; /* found it */
442 }
443
444 /* now we are supposed to have a proper phydev, to attach to... */
445 if (!phydev) {
446 printk(KERN_INFO "%s: Don't found any phy device at all\n",
447 dev->name);
448 return -ENODEV;
449 }
450
451 #if defined(CONFIG_BFIN_MAC_RMII)
452 phydev = phy_connect(dev, phydev->dev.bus_id, &bf537_adjust_link, 0,
453 PHY_INTERFACE_MODE_RMII);
454 #else
455 phydev = phy_connect(dev, phydev->dev.bus_id, &bf537_adjust_link, 0,
456 PHY_INTERFACE_MODE_MII);
457 #endif
458
459 if (IS_ERR(phydev)) {
460 printk(KERN_ERR "%s: Could not attach to PHY\n", dev->name);
461 return PTR_ERR(phydev);
462 }
463
464 /* mask with MAC supported features */
465 phydev->supported &= (SUPPORTED_10baseT_Half
466 | SUPPORTED_10baseT_Full
467 | SUPPORTED_100baseT_Half
468 | SUPPORTED_100baseT_Full
469 | SUPPORTED_Autoneg
470 | SUPPORTED_Pause | SUPPORTED_Asym_Pause
471 | SUPPORTED_MII
472 | SUPPORTED_TP);
473
474 phydev->advertising = phydev->supported;
475
476 lp->old_link = 0;
477 lp->old_speed = 0;
478 lp->old_duplex = -1;
479 lp->phydev = phydev;
480
481 printk(KERN_INFO "%s: attached PHY driver [%s] "
482 "(mii_bus:phy_addr=%s, irq=%d)\n",
483 DRV_NAME, phydev->drv->name, phydev->dev.bus_id, phydev->irq);
484
485 return 0;
486 }
487
488 /**************************************************************************/
489 void setup_system_regs(struct net_device *dev)
490 {
491 unsigned short sysctl;
492
493 /*
494 * Odd word alignment for Receive Frame DMA word
495 * Configure checksum support and rcve frame word alignment
496 */
497 sysctl = bfin_read_EMAC_SYSCTL();
498 #if defined(BFIN_MAC_CSUM_OFFLOAD)
499 sysctl |= RXDWA | RXCKS;
500 #else
501 sysctl |= RXDWA;
502 #endif
503 bfin_write_EMAC_SYSCTL(sysctl);
504
505 bfin_write_EMAC_MMC_CTL(RSTC | CROLL);
506
507 /* Initialize the TX DMA channel registers */
508 bfin_write_DMA2_X_COUNT(0);
509 bfin_write_DMA2_X_MODIFY(4);
510 bfin_write_DMA2_Y_COUNT(0);
511 bfin_write_DMA2_Y_MODIFY(0);
512
513 /* Initialize the RX DMA channel registers */
514 bfin_write_DMA1_X_COUNT(0);
515 bfin_write_DMA1_X_MODIFY(4);
516 bfin_write_DMA1_Y_COUNT(0);
517 bfin_write_DMA1_Y_MODIFY(0);
518 }
519
520 static void setup_mac_addr(u8 *mac_addr)
521 {
522 u32 addr_low = le32_to_cpu(*(__le32 *) & mac_addr[0]);
523 u16 addr_hi = le16_to_cpu(*(__le16 *) & mac_addr[4]);
524
525 /* this depends on a little-endian machine */
526 bfin_write_EMAC_ADDRLO(addr_low);
527 bfin_write_EMAC_ADDRHI(addr_hi);
528 }
529
530 static int bf537mac_set_mac_address(struct net_device *dev, void *p)
531 {
532 struct sockaddr *addr = p;
533 if (netif_running(dev))
534 return -EBUSY;
535 memcpy(dev->dev_addr, addr->sa_data, dev->addr_len);
536 setup_mac_addr(dev->dev_addr);
537 return 0;
538 }
539
540 static void adjust_tx_list(void)
541 {
542 int timeout_cnt = MAX_TIMEOUT_CNT;
543
544 if (tx_list_head->status.status_word != 0
545 && current_tx_ptr != tx_list_head) {
546 goto adjust_head; /* released something, just return; */
547 }
548
549 /*
550 * if nothing released, check wait condition
551 * current's next can not be the head,
552 * otherwise the dma will not stop as we want
553 */
554 if (current_tx_ptr->next->next == tx_list_head) {
555 while (tx_list_head->status.status_word == 0) {
556 mdelay(10);
557 if (tx_list_head->status.status_word != 0
558 || !(bfin_read_DMA2_IRQ_STATUS() & 0x08)) {
559 goto adjust_head;
560 }
561 if (timeout_cnt-- < 0) {
562 printk(KERN_ERR DRV_NAME
563 ": wait for adjust tx list head timeout\n");
564 break;
565 }
566 }
567 if (tx_list_head->status.status_word != 0) {
568 goto adjust_head;
569 }
570 }
571
572 return;
573
574 adjust_head:
575 do {
576 tx_list_head->desc_a.config &= ~DMAEN;
577 tx_list_head->status.status_word = 0;
578 if (tx_list_head->skb) {
579 dev_kfree_skb(tx_list_head->skb);
580 tx_list_head->skb = NULL;
581 } else {
582 printk(KERN_ERR DRV_NAME
583 ": no sk_buff in a transmitted frame!\n");
584 }
585 tx_list_head = tx_list_head->next;
586 } while (tx_list_head->status.status_word != 0
587 && current_tx_ptr != tx_list_head);
588 return;
589
590 }
591
592 static int bf537mac_hard_start_xmit(struct sk_buff *skb,
593 struct net_device *dev)
594 {
595 struct bf537mac_local *lp = netdev_priv(dev);
596 unsigned int data;
597
598 current_tx_ptr->skb = skb;
599
600 /*
601 * Is skb->data always 16-bit aligned?
602 * Do we need to memcpy((char *)(tail->packet + 2), skb->data, len)?
603 */
604 if ((((unsigned int)(skb->data)) & 0x02) == 2) {
605 /* move skb->data to current_tx_ptr payload */
606 data = (unsigned int)(skb->data) - 2;
607 *((unsigned short *)data) = (unsigned short)(skb->len);
608 current_tx_ptr->desc_a.start_addr = (unsigned long)data;
609 /* this is important! */
610 blackfin_dcache_flush_range(data, (data + (skb->len)) + 2);
611
612 } else {
613 *((unsigned short *)(current_tx_ptr->packet)) =
614 (unsigned short)(skb->len);
615 memcpy((char *)(current_tx_ptr->packet + 2), skb->data,
616 (skb->len));
617 current_tx_ptr->desc_a.start_addr =
618 (unsigned long)current_tx_ptr->packet;
619 if (current_tx_ptr->status.status_word != 0)
620 current_tx_ptr->status.status_word = 0;
621 blackfin_dcache_flush_range((unsigned int)current_tx_ptr->
622 packet,
623 (unsigned int)(current_tx_ptr->
624 packet + skb->len) +
625 2);
626 }
627
628 /* enable this packet's dma */
629 current_tx_ptr->desc_a.config |= DMAEN;
630
631 /* tx dma is running, just return */
632 if (bfin_read_DMA2_IRQ_STATUS() & 0x08)
633 goto out;
634
635 /* tx dma is not running */
636 bfin_write_DMA2_NEXT_DESC_PTR(&(current_tx_ptr->desc_a));
637 /* dma enabled, read from memory, size is 6 */
638 bfin_write_DMA2_CONFIG(current_tx_ptr->desc_a.config);
639 /* Turn on the EMAC tx */
640 bfin_write_EMAC_OPMODE(bfin_read_EMAC_OPMODE() | TE);
641
642 out:
643 adjust_tx_list();
644 current_tx_ptr = current_tx_ptr->next;
645 dev->trans_start = jiffies;
646 dev->stats.tx_packets++;
647 dev->stats.tx_bytes += (skb->len);
648 return 0;
649 }
650
651 static void bf537mac_rx(struct net_device *dev)
652 {
653 struct sk_buff *skb, *new_skb;
654 struct bf537mac_local *lp = netdev_priv(dev);
655 unsigned short len;
656
657 /* allocate a new skb for next time receive */
658 skb = current_rx_ptr->skb;
659 new_skb = dev_alloc_skb(PKT_BUF_SZ + 2);
660 if (!new_skb) {
661 printk(KERN_NOTICE DRV_NAME
662 ": rx: low on mem - packet dropped\n");
663 dev->stats.rx_dropped++;
664 goto out;
665 }
666 /* reserve 2 bytes for RXDWA padding */
667 skb_reserve(new_skb, 2);
668 current_rx_ptr->skb = new_skb;
669 current_rx_ptr->desc_a.start_addr = (unsigned long)new_skb->data - 2;
670
671 len = (unsigned short)((current_rx_ptr->status.status_word) & RX_FRLEN);
672 skb_put(skb, len);
673 blackfin_dcache_invalidate_range((unsigned long)skb->head,
674 (unsigned long)skb->tail);
675
676 dev->last_rx = jiffies;
677 skb->dev = dev;
678 skb->protocol = eth_type_trans(skb, dev);
679 #if defined(BFIN_MAC_CSUM_OFFLOAD)
680 skb->csum = current_rx_ptr->status.ip_payload_csum;
681 skb->ip_summed = CHECKSUM_PARTIAL;
682 #endif
683
684 netif_rx(skb);
685 dev->stats.rx_packets++;
686 dev->stats.rx_bytes += len;
687 current_rx_ptr->status.status_word = 0x00000000;
688 current_rx_ptr = current_rx_ptr->next;
689
690 out:
691 return;
692 }
693
694 /* interrupt routine to handle rx and error signal */
695 static irqreturn_t bf537mac_interrupt(int irq, void *dev_id)
696 {
697 struct net_device *dev = dev_id;
698 int number = 0;
699
700 get_one_packet:
701 if (current_rx_ptr->status.status_word == 0) {
702 /* no more new packet received */
703 if (number == 0) {
704 if (current_rx_ptr->next->status.status_word != 0) {
705 current_rx_ptr = current_rx_ptr->next;
706 goto real_rx;
707 }
708 }
709 bfin_write_DMA1_IRQ_STATUS(bfin_read_DMA1_IRQ_STATUS() |
710 DMA_DONE | DMA_ERR);
711 return IRQ_HANDLED;
712 }
713
714 real_rx:
715 bf537mac_rx(dev);
716 number++;
717 goto get_one_packet;
718 }
719
720 #ifdef CONFIG_NET_POLL_CONTROLLER
721 static void bf537mac_poll(struct net_device *dev)
722 {
723 disable_irq(IRQ_MAC_RX);
724 bf537mac_interrupt(IRQ_MAC_RX, dev);
725 enable_irq(IRQ_MAC_RX);
726 }
727 #endif /* CONFIG_NET_POLL_CONTROLLER */
728
729 static void bf537mac_disable(void)
730 {
731 unsigned int opmode;
732
733 opmode = bfin_read_EMAC_OPMODE();
734 opmode &= (~RE);
735 opmode &= (~TE);
736 /* Turn off the EMAC */
737 bfin_write_EMAC_OPMODE(opmode);
738 }
739
740 /*
741 * Enable Interrupts, Receive, and Transmit
742 */
743 static void bf537mac_enable(void)
744 {
745 u32 opmode;
746
747 pr_debug("%s: %s\n", DRV_NAME, __FUNCTION__);
748
749 /* Set RX DMA */
750 bfin_write_DMA1_NEXT_DESC_PTR(&(rx_list_head->desc_a));
751 bfin_write_DMA1_CONFIG(rx_list_head->desc_a.config);
752
753 /* Wait MII done */
754 mdio_poll();
755
756 /* We enable only RX here */
757 /* ASTP : Enable Automatic Pad Stripping
758 PR : Promiscuous Mode for test
759 PSF : Receive frames with total length less than 64 bytes.
760 FDMODE : Full Duplex Mode
761 LB : Internal Loopback for test
762 RE : Receiver Enable */
763 opmode = bfin_read_EMAC_OPMODE();
764 if (opmode & FDMODE)
765 opmode |= PSF;
766 else
767 opmode |= DRO | DC | PSF;
768 opmode |= RE;
769
770 #if defined(CONFIG_BFIN_MAC_RMII)
771 opmode |= RMII; /* For Now only 100MBit are supported */
772 #ifdef CONFIG_BF_REV_0_2
773 opmode |= TE;
774 #endif
775 #endif
776 /* Turn on the EMAC rx */
777 bfin_write_EMAC_OPMODE(opmode);
778 }
779
780 /* Our watchdog timed out. Called by the networking layer */
781 static void bf537mac_timeout(struct net_device *dev)
782 {
783 pr_debug("%s: %s\n", dev->name, __FUNCTION__);
784
785 bf537mac_disable();
786
787 /* reset tx queue */
788 tx_list_tail = tx_list_head->next;
789
790 bf537mac_enable();
791
792 /* We can accept TX packets again */
793 dev->trans_start = jiffies;
794 netif_wake_queue(dev);
795 }
796
797 /*
798 * This routine will, depending on the values passed to it,
799 * either make it accept multicast packets, go into
800 * promiscuous mode (for TCPDUMP and cousins) or accept
801 * a select set of multicast packets
802 */
803 static void bf537mac_set_multicast_list(struct net_device *dev)
804 {
805 u32 sysctl;
806
807 if (dev->flags & IFF_PROMISC) {
808 printk(KERN_INFO "%s: set to promisc mode\n", dev->name);
809 sysctl = bfin_read_EMAC_OPMODE();
810 sysctl |= RAF;
811 bfin_write_EMAC_OPMODE(sysctl);
812 } else if (dev->flags & IFF_ALLMULTI || dev->mc_count) {
813 /* accept all multicast */
814 sysctl = bfin_read_EMAC_OPMODE();
815 sysctl |= PAM;
816 bfin_write_EMAC_OPMODE(sysctl);
817 } else {
818 /* clear promisc or multicast mode */
819 sysctl = bfin_read_EMAC_OPMODE();
820 sysctl &= ~(RAF | PAM);
821 bfin_write_EMAC_OPMODE(sysctl);
822 }
823 }
824
825 /*
826 * this puts the device in an inactive state
827 */
828 static void bf537mac_shutdown(struct net_device *dev)
829 {
830 /* Turn off the EMAC */
831 bfin_write_EMAC_OPMODE(0x00000000);
832 /* Turn off the EMAC RX DMA */
833 bfin_write_DMA1_CONFIG(0x0000);
834 bfin_write_DMA2_CONFIG(0x0000);
835 }
836
837 /*
838 * Open and Initialize the interface
839 *
840 * Set up everything, reset the card, etc..
841 */
842 static int bf537mac_open(struct net_device *dev)
843 {
844 struct bf537mac_local *lp = netdev_priv(dev);
845 int retval;
846 pr_debug("%s: %s\n", dev->name, __FUNCTION__);
847
848 /*
849 * Check that the address is valid. If its not, refuse
850 * to bring the device up. The user must specify an
851 * address using ifconfig eth0 hw ether xx:xx:xx:xx:xx:xx
852 */
853 if (!is_valid_ether_addr(dev->dev_addr)) {
854 printk(KERN_WARNING DRV_NAME ": no valid ethernet hw addr\n");
855 return -EINVAL;
856 }
857
858 /* initial rx and tx list */
859 retval = desc_list_init();
860
861 if (retval)
862 return retval;
863
864 phy_start(lp->phydev);
865 setup_system_regs(dev);
866 bf537mac_disable();
867 bf537mac_enable();
868
869 pr_debug("hardware init finished\n");
870 netif_start_queue(dev);
871 netif_carrier_on(dev);
872
873 return 0;
874 }
875
876 /*
877 *
878 * this makes the board clean up everything that it can
879 * and not talk to the outside world. Caused by
880 * an 'ifconfig ethX down'
881 */
882 static int bf537mac_close(struct net_device *dev)
883 {
884 struct bf537mac_local *lp = netdev_priv(dev);
885 pr_debug("%s: %s\n", dev->name, __FUNCTION__);
886
887 netif_stop_queue(dev);
888 netif_carrier_off(dev);
889
890 phy_stop(lp->phydev);
891
892 /* clear everything */
893 bf537mac_shutdown(dev);
894
895 /* free the rx/tx buffers */
896 desc_list_free();
897
898 return 0;
899 }
900
901 static int __init bf537mac_probe(struct net_device *dev)
902 {
903 struct bf537mac_local *lp = netdev_priv(dev);
904 int retval;
905 int i;
906
907 /* Grab the MAC address in the MAC */
908 *(__le32 *) (&(dev->dev_addr[0])) = cpu_to_le32(bfin_read_EMAC_ADDRLO());
909 *(__le16 *) (&(dev->dev_addr[4])) = cpu_to_le16((u16) bfin_read_EMAC_ADDRHI());
910
911 /* probe mac */
912 /*todo: how to proble? which is revision_register */
913 bfin_write_EMAC_ADDRLO(0x12345678);
914 if (bfin_read_EMAC_ADDRLO() != 0x12345678) {
915 pr_debug("can't detect bf537 mac!\n");
916 retval = -ENODEV;
917 goto err_out;
918 }
919
920 /* set the GPIO pins to Ethernet mode */
921 retval = setup_pin_mux(1);
922 if (retval)
923 return retval;
924
925 /*Is it valid? (Did bootloader initialize it?) */
926 if (!is_valid_ether_addr(dev->dev_addr)) {
927 /* Grab the MAC from the board somehow - this is done in the
928 arch/blackfin/mach-bf537/boards/eth_mac.c */
929 get_bf537_ether_addr(dev->dev_addr);
930 }
931
932 /* If still not valid, get a random one */
933 if (!is_valid_ether_addr(dev->dev_addr)) {
934 random_ether_addr(dev->dev_addr);
935 }
936
937 setup_mac_addr(dev->dev_addr);
938
939 /* MDIO bus initial */
940 lp->mii_bus.priv = dev;
941 lp->mii_bus.read = mdiobus_read;
942 lp->mii_bus.write = mdiobus_write;
943 lp->mii_bus.reset = mdiobus_reset;
944 lp->mii_bus.name = "bfin_mac_mdio";
945 lp->mii_bus.id = 0;
946 lp->mii_bus.irq = kmalloc(sizeof(int)*PHY_MAX_ADDR, GFP_KERNEL);
947 for (i = 0; i < PHY_MAX_ADDR; ++i)
948 lp->mii_bus.irq[i] = PHY_POLL;
949
950 mdiobus_register(&lp->mii_bus);
951
952 retval = mii_probe(dev);
953 if (retval)
954 return retval;
955
956 /* Fill in the fields of the device structure with ethernet values. */
957 ether_setup(dev);
958
959 dev->open = bf537mac_open;
960 dev->stop = bf537mac_close;
961 dev->hard_start_xmit = bf537mac_hard_start_xmit;
962 dev->set_mac_address = bf537mac_set_mac_address;
963 dev->tx_timeout = bf537mac_timeout;
964 dev->set_multicast_list = bf537mac_set_multicast_list;
965 #ifdef CONFIG_NET_POLL_CONTROLLER
966 dev->poll_controller = bf537mac_poll;
967 #endif
968
969 spin_lock_init(&lp->lock);
970
971 /* now, enable interrupts */
972 /* register irq handler */
973 if (request_irq
974 (IRQ_MAC_RX, bf537mac_interrupt, IRQF_DISABLED | IRQF_SHARED,
975 "BFIN537_MAC_RX", dev)) {
976 printk(KERN_WARNING DRV_NAME
977 ": Unable to attach BlackFin MAC RX interrupt\n");
978 return -EBUSY;
979 }
980
981
982 retval = register_netdev(dev);
983 if (retval == 0) {
984 /* now, print out the card info, in a short format.. */
985 printk(KERN_INFO "%s: Version %s, %s\n",
986 DRV_NAME, DRV_VERSION, DRV_DESC);
987 }
988
989 err_out:
990 return retval;
991 }
992
993 static int bfin_mac_probe(struct platform_device *pdev)
994 {
995 struct net_device *ndev;
996
997 ndev = alloc_etherdev(sizeof(struct bf537mac_local));
998 if (!ndev) {
999 printk(KERN_WARNING DRV_NAME ": could not allocate device\n");
1000 return -ENOMEM;
1001 }
1002
1003 SET_NETDEV_DEV(ndev, &pdev->dev);
1004
1005 platform_set_drvdata(pdev, ndev);
1006
1007 if (bf537mac_probe(ndev) != 0) {
1008 platform_set_drvdata(pdev, NULL);
1009 free_netdev(ndev);
1010 printk(KERN_WARNING DRV_NAME ": not found\n");
1011 return -ENODEV;
1012 }
1013
1014 return 0;
1015 }
1016
1017 static int bfin_mac_remove(struct platform_device *pdev)
1018 {
1019 struct net_device *ndev = platform_get_drvdata(pdev);
1020
1021 platform_set_drvdata(pdev, NULL);
1022
1023 unregister_netdev(ndev);
1024
1025 free_irq(IRQ_MAC_RX, ndev);
1026
1027 free_netdev(ndev);
1028
1029 setup_pin_mux(0);
1030
1031 return 0;
1032 }
1033
1034 #ifdef CONFIG_PM
1035 static int bfin_mac_suspend(struct platform_device *pdev, pm_message_t mesg)
1036 {
1037 struct net_device *net_dev = platform_get_drvdata(pdev);
1038
1039 if (netif_running(net_dev))
1040 bf537mac_close(net_dev);
1041
1042 return 0;
1043 }
1044
1045 static int bfin_mac_resume(struct platform_device *pdev)
1046 {
1047 struct net_device *net_dev = platform_get_drvdata(pdev);
1048
1049 if (netif_running(net_dev))
1050 bf537mac_open(net_dev);
1051
1052 return 0;
1053 }
1054 #else
1055 #define bfin_mac_suspend NULL
1056 #define bfin_mac_resume NULL
1057 #endif /* CONFIG_PM */
1058
1059 static struct platform_driver bfin_mac_driver = {
1060 .probe = bfin_mac_probe,
1061 .remove = bfin_mac_remove,
1062 .resume = bfin_mac_resume,
1063 .suspend = bfin_mac_suspend,
1064 .driver = {
1065 .name = DRV_NAME,
1066 },
1067 };
1068
1069 static int __init bfin_mac_init(void)
1070 {
1071 return platform_driver_register(&bfin_mac_driver);
1072 }
1073
1074 module_init(bfin_mac_init);
1075
1076 static void __exit bfin_mac_cleanup(void)
1077 {
1078 platform_driver_unregister(&bfin_mac_driver);
1079 }
1080
1081 module_exit(bfin_mac_cleanup);
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