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EMAC driver: define MDC_CLK=2.5MHz and caculate mdc_div according to SCLK.
[deliverable/linux.git] / drivers / net / bfin_mac.c
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 udelay(1);
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 switch (phydev->speed) {
375 case 10:
376 opmode |= RMII_10;
377 break;
378 case 100:
379 opmode &= ~(RMII_10);
380 break;
381 default:
382 printk(KERN_WARNING
383 "%s: Ack! Speed (%d) is not 10/100!\n",
384 DRV_NAME, phydev->speed);
385 break;
386 }
387 bfin_write_EMAC_OPMODE(opmode);
388 #endif
389
390 new_state = 1;
391 lp->old_speed = phydev->speed;
392 }
393
394 if (!lp->old_link) {
395 new_state = 1;
396 lp->old_link = 1;
397 netif_schedule(dev);
398 }
399 } else if (lp->old_link) {
400 new_state = 1;
401 lp->old_link = 0;
402 lp->old_speed = 0;
403 lp->old_duplex = -1;
404 }
405
406 if (new_state) {
407 u32 opmode = bfin_read_EMAC_OPMODE();
408 phy_print_status(phydev);
409 pr_debug("EMAC_OPMODE = 0x%08x\n", opmode);
410 }
411
412 spin_unlock_irqrestore(&lp->lock, flags);
413 }
414
415 /* MDC = 2.5 MHz */
416 #define MDC_CLK 2500000
417
418 static int mii_probe(struct net_device *dev)
419 {
420 struct bf537mac_local *lp = netdev_priv(dev);
421 struct phy_device *phydev = NULL;
422 unsigned short sysctl;
423 int i;
424 u32 sclk, mdc_div;
425
426 /* Enable PHY output early */
427 if (!(bfin_read_VR_CTL() & PHYCLKOE))
428 bfin_write_VR_CTL(bfin_read_VR_CTL() | PHYCLKOE);
429
430 sclk = get_sclk();
431 mdc_div = ((sclk / MDC_CLK) / 2) - 1;
432
433 sysctl = bfin_read_EMAC_SYSCTL();
434 sysctl |= SET_MDCDIV(mdc_div);
435 bfin_write_EMAC_SYSCTL(sysctl);
436
437 /* search for connect PHY device */
438 for (i = 0; i < PHY_MAX_ADDR; i++) {
439 struct phy_device *const tmp_phydev = lp->mii_bus.phy_map[i];
440
441 if (!tmp_phydev)
442 continue; /* no PHY here... */
443
444 phydev = tmp_phydev;
445 break; /* found it */
446 }
447
448 /* now we are supposed to have a proper phydev, to attach to... */
449 if (!phydev) {
450 printk(KERN_INFO "%s: Don't found any phy device at all\n",
451 dev->name);
452 return -ENODEV;
453 }
454
455 #if defined(CONFIG_BFIN_MAC_RMII)
456 phydev = phy_connect(dev, phydev->dev.bus_id, &bf537_adjust_link, 0,
457 PHY_INTERFACE_MODE_RMII);
458 #else
459 phydev = phy_connect(dev, phydev->dev.bus_id, &bf537_adjust_link, 0,
460 PHY_INTERFACE_MODE_MII);
461 #endif
462
463 if (IS_ERR(phydev)) {
464 printk(KERN_ERR "%s: Could not attach to PHY\n", dev->name);
465 return PTR_ERR(phydev);
466 }
467
468 /* mask with MAC supported features */
469 phydev->supported &= (SUPPORTED_10baseT_Half
470 | SUPPORTED_10baseT_Full
471 | SUPPORTED_100baseT_Half
472 | SUPPORTED_100baseT_Full
473 | SUPPORTED_Autoneg
474 | SUPPORTED_Pause | SUPPORTED_Asym_Pause
475 | SUPPORTED_MII
476 | SUPPORTED_TP);
477
478 phydev->advertising = phydev->supported;
479
480 lp->old_link = 0;
481 lp->old_speed = 0;
482 lp->old_duplex = -1;
483 lp->phydev = phydev;
484
485 printk(KERN_INFO "%s: attached PHY driver [%s] "
486 "(mii_bus:phy_addr=%s, irq=%d, mdc_clk=%dHz(mdc_div=%d)"
487 "@sclk=%dMHz)\n",
488 DRV_NAME, phydev->drv->name, phydev->dev.bus_id, phydev->irq,
489 MDC_CLK, mdc_div, sclk/1000000);
490
491 return 0;
492 }
493
494 /**************************************************************************/
495 void setup_system_regs(struct net_device *dev)
496 {
497 unsigned short sysctl;
498
499 /*
500 * Odd word alignment for Receive Frame DMA word
501 * Configure checksum support and rcve frame word alignment
502 */
503 sysctl = bfin_read_EMAC_SYSCTL();
504 #if defined(BFIN_MAC_CSUM_OFFLOAD)
505 sysctl |= RXDWA | RXCKS;
506 #else
507 sysctl |= RXDWA;
508 #endif
509 bfin_write_EMAC_SYSCTL(sysctl);
510
511 bfin_write_EMAC_MMC_CTL(RSTC | CROLL);
512
513 /* Initialize the TX DMA channel registers */
514 bfin_write_DMA2_X_COUNT(0);
515 bfin_write_DMA2_X_MODIFY(4);
516 bfin_write_DMA2_Y_COUNT(0);
517 bfin_write_DMA2_Y_MODIFY(0);
518
519 /* Initialize the RX DMA channel registers */
520 bfin_write_DMA1_X_COUNT(0);
521 bfin_write_DMA1_X_MODIFY(4);
522 bfin_write_DMA1_Y_COUNT(0);
523 bfin_write_DMA1_Y_MODIFY(0);
524 }
525
526 static void setup_mac_addr(u8 *mac_addr)
527 {
528 u32 addr_low = le32_to_cpu(*(__le32 *) & mac_addr[0]);
529 u16 addr_hi = le16_to_cpu(*(__le16 *) & mac_addr[4]);
530
531 /* this depends on a little-endian machine */
532 bfin_write_EMAC_ADDRLO(addr_low);
533 bfin_write_EMAC_ADDRHI(addr_hi);
534 }
535
536 static int bf537mac_set_mac_address(struct net_device *dev, void *p)
537 {
538 struct sockaddr *addr = p;
539 if (netif_running(dev))
540 return -EBUSY;
541 memcpy(dev->dev_addr, addr->sa_data, dev->addr_len);
542 setup_mac_addr(dev->dev_addr);
543 return 0;
544 }
545
546 static void adjust_tx_list(void)
547 {
548 int timeout_cnt = MAX_TIMEOUT_CNT;
549
550 if (tx_list_head->status.status_word != 0
551 && current_tx_ptr != tx_list_head) {
552 goto adjust_head; /* released something, just return; */
553 }
554
555 /*
556 * if nothing released, check wait condition
557 * current's next can not be the head,
558 * otherwise the dma will not stop as we want
559 */
560 if (current_tx_ptr->next->next == tx_list_head) {
561 while (tx_list_head->status.status_word == 0) {
562 mdelay(1);
563 if (tx_list_head->status.status_word != 0
564 || !(bfin_read_DMA2_IRQ_STATUS() & 0x08)) {
565 goto adjust_head;
566 }
567 if (timeout_cnt-- < 0) {
568 printk(KERN_ERR DRV_NAME
569 ": wait for adjust tx list head timeout\n");
570 break;
571 }
572 }
573 if (tx_list_head->status.status_word != 0) {
574 goto adjust_head;
575 }
576 }
577
578 return;
579
580 adjust_head:
581 do {
582 tx_list_head->desc_a.config &= ~DMAEN;
583 tx_list_head->status.status_word = 0;
584 if (tx_list_head->skb) {
585 dev_kfree_skb(tx_list_head->skb);
586 tx_list_head->skb = NULL;
587 } else {
588 printk(KERN_ERR DRV_NAME
589 ": no sk_buff in a transmitted frame!\n");
590 }
591 tx_list_head = tx_list_head->next;
592 } while (tx_list_head->status.status_word != 0
593 && current_tx_ptr != tx_list_head);
594 return;
595
596 }
597
598 static int bf537mac_hard_start_xmit(struct sk_buff *skb,
599 struct net_device *dev)
600 {
601 struct bf537mac_local *lp = netdev_priv(dev);
602 unsigned int data;
603
604 current_tx_ptr->skb = skb;
605
606 /*
607 * Is skb->data always 16-bit aligned?
608 * Do we need to memcpy((char *)(tail->packet + 2), skb->data, len)?
609 */
610 if ((((unsigned int)(skb->data)) & 0x02) == 2) {
611 /* move skb->data to current_tx_ptr payload */
612 data = (unsigned int)(skb->data) - 2;
613 *((unsigned short *)data) = (unsigned short)(skb->len);
614 current_tx_ptr->desc_a.start_addr = (unsigned long)data;
615 /* this is important! */
616 blackfin_dcache_flush_range(data, (data + (skb->len)) + 2);
617
618 } else {
619 *((unsigned short *)(current_tx_ptr->packet)) =
620 (unsigned short)(skb->len);
621 memcpy((char *)(current_tx_ptr->packet + 2), skb->data,
622 (skb->len));
623 current_tx_ptr->desc_a.start_addr =
624 (unsigned long)current_tx_ptr->packet;
625 if (current_tx_ptr->status.status_word != 0)
626 current_tx_ptr->status.status_word = 0;
627 blackfin_dcache_flush_range((unsigned int)current_tx_ptr->
628 packet,
629 (unsigned int)(current_tx_ptr->
630 packet + skb->len) +
631 2);
632 }
633
634 /* enable this packet's dma */
635 current_tx_ptr->desc_a.config |= DMAEN;
636
637 /* tx dma is running, just return */
638 if (bfin_read_DMA2_IRQ_STATUS() & 0x08)
639 goto out;
640
641 /* tx dma is not running */
642 bfin_write_DMA2_NEXT_DESC_PTR(&(current_tx_ptr->desc_a));
643 /* dma enabled, read from memory, size is 6 */
644 bfin_write_DMA2_CONFIG(current_tx_ptr->desc_a.config);
645 /* Turn on the EMAC tx */
646 bfin_write_EMAC_OPMODE(bfin_read_EMAC_OPMODE() | TE);
647
648 out:
649 adjust_tx_list();
650 current_tx_ptr = current_tx_ptr->next;
651 dev->trans_start = jiffies;
652 dev->stats.tx_packets++;
653 dev->stats.tx_bytes += (skb->len);
654 return 0;
655 }
656
657 static void bf537mac_rx(struct net_device *dev)
658 {
659 struct sk_buff *skb, *new_skb;
660 struct bf537mac_local *lp = netdev_priv(dev);
661 unsigned short len;
662
663 /* allocate a new skb for next time receive */
664 skb = current_rx_ptr->skb;
665 new_skb = dev_alloc_skb(PKT_BUF_SZ + 2);
666 if (!new_skb) {
667 printk(KERN_NOTICE DRV_NAME
668 ": rx: low on mem - packet dropped\n");
669 dev->stats.rx_dropped++;
670 goto out;
671 }
672 /* reserve 2 bytes for RXDWA padding */
673 skb_reserve(new_skb, 2);
674 current_rx_ptr->skb = new_skb;
675 current_rx_ptr->desc_a.start_addr = (unsigned long)new_skb->data - 2;
676
677 len = (unsigned short)((current_rx_ptr->status.status_word) & RX_FRLEN);
678 skb_put(skb, len);
679 blackfin_dcache_invalidate_range((unsigned long)skb->head,
680 (unsigned long)skb->tail);
681
682 dev->last_rx = jiffies;
683 skb->dev = dev;
684 skb->protocol = eth_type_trans(skb, dev);
685 #if defined(BFIN_MAC_CSUM_OFFLOAD)
686 skb->csum = current_rx_ptr->status.ip_payload_csum;
687 skb->ip_summed = CHECKSUM_COMPLETE;
688 #endif
689
690 netif_rx(skb);
691 dev->stats.rx_packets++;
692 dev->stats.rx_bytes += len;
693 current_rx_ptr->status.status_word = 0x00000000;
694 current_rx_ptr = current_rx_ptr->next;
695
696 out:
697 return;
698 }
699
700 /* interrupt routine to handle rx and error signal */
701 static irqreturn_t bf537mac_interrupt(int irq, void *dev_id)
702 {
703 struct net_device *dev = dev_id;
704 int number = 0;
705
706 get_one_packet:
707 if (current_rx_ptr->status.status_word == 0) {
708 /* no more new packet received */
709 if (number == 0) {
710 if (current_rx_ptr->next->status.status_word != 0) {
711 current_rx_ptr = current_rx_ptr->next;
712 goto real_rx;
713 }
714 }
715 bfin_write_DMA1_IRQ_STATUS(bfin_read_DMA1_IRQ_STATUS() |
716 DMA_DONE | DMA_ERR);
717 return IRQ_HANDLED;
718 }
719
720 real_rx:
721 bf537mac_rx(dev);
722 number++;
723 goto get_one_packet;
724 }
725
726 #ifdef CONFIG_NET_POLL_CONTROLLER
727 static void bf537mac_poll(struct net_device *dev)
728 {
729 disable_irq(IRQ_MAC_RX);
730 bf537mac_interrupt(IRQ_MAC_RX, dev);
731 enable_irq(IRQ_MAC_RX);
732 }
733 #endif /* CONFIG_NET_POLL_CONTROLLER */
734
735 static void bf537mac_disable(void)
736 {
737 unsigned int opmode;
738
739 opmode = bfin_read_EMAC_OPMODE();
740 opmode &= (~RE);
741 opmode &= (~TE);
742 /* Turn off the EMAC */
743 bfin_write_EMAC_OPMODE(opmode);
744 }
745
746 /*
747 * Enable Interrupts, Receive, and Transmit
748 */
749 static void bf537mac_enable(void)
750 {
751 u32 opmode;
752
753 pr_debug("%s: %s\n", DRV_NAME, __FUNCTION__);
754
755 /* Set RX DMA */
756 bfin_write_DMA1_NEXT_DESC_PTR(&(rx_list_head->desc_a));
757 bfin_write_DMA1_CONFIG(rx_list_head->desc_a.config);
758
759 /* Wait MII done */
760 mdio_poll();
761
762 /* We enable only RX here */
763 /* ASTP : Enable Automatic Pad Stripping
764 PR : Promiscuous Mode for test
765 PSF : Receive frames with total length less than 64 bytes.
766 FDMODE : Full Duplex Mode
767 LB : Internal Loopback for test
768 RE : Receiver Enable */
769 opmode = bfin_read_EMAC_OPMODE();
770 if (opmode & FDMODE)
771 opmode |= PSF;
772 else
773 opmode |= DRO | DC | PSF;
774 opmode |= RE;
775
776 #if defined(CONFIG_BFIN_MAC_RMII)
777 opmode |= RMII; /* For Now only 100MBit are supported */
778 #ifdef CONFIG_BF_REV_0_2
779 opmode |= TE;
780 #endif
781 #endif
782 /* Turn on the EMAC rx */
783 bfin_write_EMAC_OPMODE(opmode);
784 }
785
786 /* Our watchdog timed out. Called by the networking layer */
787 static void bf537mac_timeout(struct net_device *dev)
788 {
789 pr_debug("%s: %s\n", dev->name, __FUNCTION__);
790
791 bf537mac_disable();
792
793 /* reset tx queue */
794 tx_list_tail = tx_list_head->next;
795
796 bf537mac_enable();
797
798 /* We can accept TX packets again */
799 dev->trans_start = jiffies;
800 netif_wake_queue(dev);
801 }
802
803 /*
804 * This routine will, depending on the values passed to it,
805 * either make it accept multicast packets, go into
806 * promiscuous mode (for TCPDUMP and cousins) or accept
807 * a select set of multicast packets
808 */
809 static void bf537mac_set_multicast_list(struct net_device *dev)
810 {
811 u32 sysctl;
812
813 if (dev->flags & IFF_PROMISC) {
814 printk(KERN_INFO "%s: set to promisc mode\n", dev->name);
815 sysctl = bfin_read_EMAC_OPMODE();
816 sysctl |= RAF;
817 bfin_write_EMAC_OPMODE(sysctl);
818 } else if (dev->flags & IFF_ALLMULTI || dev->mc_count) {
819 /* accept all multicast */
820 sysctl = bfin_read_EMAC_OPMODE();
821 sysctl |= PAM;
822 bfin_write_EMAC_OPMODE(sysctl);
823 } else {
824 /* clear promisc or multicast mode */
825 sysctl = bfin_read_EMAC_OPMODE();
826 sysctl &= ~(RAF | PAM);
827 bfin_write_EMAC_OPMODE(sysctl);
828 }
829 }
830
831 /*
832 * this puts the device in an inactive state
833 */
834 static void bf537mac_shutdown(struct net_device *dev)
835 {
836 /* Turn off the EMAC */
837 bfin_write_EMAC_OPMODE(0x00000000);
838 /* Turn off the EMAC RX DMA */
839 bfin_write_DMA1_CONFIG(0x0000);
840 bfin_write_DMA2_CONFIG(0x0000);
841 }
842
843 /*
844 * Open and Initialize the interface
845 *
846 * Set up everything, reset the card, etc..
847 */
848 static int bf537mac_open(struct net_device *dev)
849 {
850 struct bf537mac_local *lp = netdev_priv(dev);
851 int retval;
852 pr_debug("%s: %s\n", dev->name, __FUNCTION__);
853
854 /*
855 * Check that the address is valid. If its not, refuse
856 * to bring the device up. The user must specify an
857 * address using ifconfig eth0 hw ether xx:xx:xx:xx:xx:xx
858 */
859 if (!is_valid_ether_addr(dev->dev_addr)) {
860 printk(KERN_WARNING DRV_NAME ": no valid ethernet hw addr\n");
861 return -EINVAL;
862 }
863
864 /* initial rx and tx list */
865 retval = desc_list_init();
866
867 if (retval)
868 return retval;
869
870 phy_start(lp->phydev);
871 setup_system_regs(dev);
872 bf537mac_disable();
873 bf537mac_enable();
874
875 pr_debug("hardware init finished\n");
876 netif_start_queue(dev);
877 netif_carrier_on(dev);
878
879 return 0;
880 }
881
882 /*
883 *
884 * this makes the board clean up everything that it can
885 * and not talk to the outside world. Caused by
886 * an 'ifconfig ethX down'
887 */
888 static int bf537mac_close(struct net_device *dev)
889 {
890 struct bf537mac_local *lp = netdev_priv(dev);
891 pr_debug("%s: %s\n", dev->name, __FUNCTION__);
892
893 netif_stop_queue(dev);
894 netif_carrier_off(dev);
895
896 phy_stop(lp->phydev);
897
898 /* clear everything */
899 bf537mac_shutdown(dev);
900
901 /* free the rx/tx buffers */
902 desc_list_free();
903
904 return 0;
905 }
906
907 static int __init bf537mac_probe(struct net_device *dev)
908 {
909 struct bf537mac_local *lp = netdev_priv(dev);
910 int retval;
911 int i;
912
913 /* Grab the MAC address in the MAC */
914 *(__le32 *) (&(dev->dev_addr[0])) = cpu_to_le32(bfin_read_EMAC_ADDRLO());
915 *(__le16 *) (&(dev->dev_addr[4])) = cpu_to_le16((u16) bfin_read_EMAC_ADDRHI());
916
917 /* probe mac */
918 /*todo: how to proble? which is revision_register */
919 bfin_write_EMAC_ADDRLO(0x12345678);
920 if (bfin_read_EMAC_ADDRLO() != 0x12345678) {
921 pr_debug("can't detect bf537 mac!\n");
922 retval = -ENODEV;
923 goto err_out;
924 }
925
926 /* set the GPIO pins to Ethernet mode */
927 retval = setup_pin_mux(1);
928 if (retval)
929 return retval;
930
931 /*Is it valid? (Did bootloader initialize it?) */
932 if (!is_valid_ether_addr(dev->dev_addr)) {
933 /* Grab the MAC from the board somehow - this is done in the
934 arch/blackfin/mach-bf537/boards/eth_mac.c */
935 bfin_get_ether_addr(dev->dev_addr);
936 }
937
938 /* If still not valid, get a random one */
939 if (!is_valid_ether_addr(dev->dev_addr)) {
940 random_ether_addr(dev->dev_addr);
941 }
942
943 setup_mac_addr(dev->dev_addr);
944
945 /* MDIO bus initial */
946 lp->mii_bus.priv = dev;
947 lp->mii_bus.read = mdiobus_read;
948 lp->mii_bus.write = mdiobus_write;
949 lp->mii_bus.reset = mdiobus_reset;
950 lp->mii_bus.name = "bfin_mac_mdio";
951 lp->mii_bus.id = 0;
952 lp->mii_bus.irq = kmalloc(sizeof(int)*PHY_MAX_ADDR, GFP_KERNEL);
953 for (i = 0; i < PHY_MAX_ADDR; ++i)
954 lp->mii_bus.irq[i] = PHY_POLL;
955
956 mdiobus_register(&lp->mii_bus);
957
958 retval = mii_probe(dev);
959 if (retval)
960 return retval;
961
962 /* Fill in the fields of the device structure with ethernet values. */
963 ether_setup(dev);
964
965 dev->open = bf537mac_open;
966 dev->stop = bf537mac_close;
967 dev->hard_start_xmit = bf537mac_hard_start_xmit;
968 dev->set_mac_address = bf537mac_set_mac_address;
969 dev->tx_timeout = bf537mac_timeout;
970 dev->set_multicast_list = bf537mac_set_multicast_list;
971 #ifdef CONFIG_NET_POLL_CONTROLLER
972 dev->poll_controller = bf537mac_poll;
973 #endif
974
975 spin_lock_init(&lp->lock);
976
977 /* now, enable interrupts */
978 /* register irq handler */
979 if (request_irq
980 (IRQ_MAC_RX, bf537mac_interrupt, IRQF_DISABLED | IRQF_SHARED,
981 "BFIN537_MAC_RX", dev)) {
982 printk(KERN_WARNING DRV_NAME
983 ": Unable to attach BlackFin MAC RX interrupt\n");
984 return -EBUSY;
985 }
986
987
988 retval = register_netdev(dev);
989 if (retval == 0) {
990 /* now, print out the card info, in a short format.. */
991 printk(KERN_INFO "%s: Version %s, %s\n",
992 DRV_NAME, DRV_VERSION, DRV_DESC);
993 }
994
995 err_out:
996 return retval;
997 }
998
999 static int bfin_mac_probe(struct platform_device *pdev)
1000 {
1001 struct net_device *ndev;
1002
1003 ndev = alloc_etherdev(sizeof(struct bf537mac_local));
1004 if (!ndev) {
1005 printk(KERN_WARNING DRV_NAME ": could not allocate device\n");
1006 return -ENOMEM;
1007 }
1008
1009 SET_NETDEV_DEV(ndev, &pdev->dev);
1010
1011 platform_set_drvdata(pdev, ndev);
1012
1013 if (bf537mac_probe(ndev) != 0) {
1014 platform_set_drvdata(pdev, NULL);
1015 free_netdev(ndev);
1016 printk(KERN_WARNING DRV_NAME ": not found\n");
1017 return -ENODEV;
1018 }
1019
1020 return 0;
1021 }
1022
1023 static int bfin_mac_remove(struct platform_device *pdev)
1024 {
1025 struct net_device *ndev = platform_get_drvdata(pdev);
1026
1027 platform_set_drvdata(pdev, NULL);
1028
1029 unregister_netdev(ndev);
1030
1031 free_irq(IRQ_MAC_RX, ndev);
1032
1033 free_netdev(ndev);
1034
1035 setup_pin_mux(0);
1036
1037 return 0;
1038 }
1039
1040 #ifdef CONFIG_PM
1041 static int bfin_mac_suspend(struct platform_device *pdev, pm_message_t mesg)
1042 {
1043 struct net_device *net_dev = platform_get_drvdata(pdev);
1044
1045 if (netif_running(net_dev))
1046 bf537mac_close(net_dev);
1047
1048 return 0;
1049 }
1050
1051 static int bfin_mac_resume(struct platform_device *pdev)
1052 {
1053 struct net_device *net_dev = platform_get_drvdata(pdev);
1054
1055 if (netif_running(net_dev))
1056 bf537mac_open(net_dev);
1057
1058 return 0;
1059 }
1060 #else
1061 #define bfin_mac_suspend NULL
1062 #define bfin_mac_resume NULL
1063 #endif /* CONFIG_PM */
1064
1065 static struct platform_driver bfin_mac_driver = {
1066 .probe = bfin_mac_probe,
1067 .remove = bfin_mac_remove,
1068 .resume = bfin_mac_resume,
1069 .suspend = bfin_mac_suspend,
1070 .driver = {
1071 .name = DRV_NAME,
1072 },
1073 };
1074
1075 static int __init bfin_mac_init(void)
1076 {
1077 return platform_driver_register(&bfin_mac_driver);
1078 }
1079
1080 module_init(bfin_mac_init);
1081
1082 static void __exit bfin_mac_cleanup(void)
1083 {
1084 platform_driver_unregister(&bfin_mac_driver);
1085 }
1086
1087 module_exit(bfin_mac_cleanup);
Linux kernel - Deliverables
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