Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-2.6
[linux-2.6] / 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                 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);