Merge branch 'master' into upstream-fixes
[linux-2.6.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                 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                         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 static int mii_probe(struct net_device *dev)
416 {
417         struct bf537mac_local *lp = netdev_priv(dev);
418         struct phy_device *phydev = NULL;
419         unsigned short sysctl;
420         int i;
421
422         /* Enable PHY output early */
423         if (!(bfin_read_VR_CTL() & PHYCLKOE))
424                 bfin_write_VR_CTL(bfin_read_VR_CTL() | PHYCLKOE);
425
426         /* MDC  = 2.5 MHz */
427         sysctl = bfin_read_EMAC_SYSCTL();
428         sysctl |= SET_MDCDIV(24);
429         bfin_write_EMAC_SYSCTL(sysctl);
430
431         /* search for connect PHY device */
432         for (i = 0; i < PHY_MAX_ADDR; i++) {
433                 struct phy_device *const tmp_phydev = lp->mii_bus.phy_map[i];
434
435                 if (!tmp_phydev)
436                         continue; /* no PHY here... */
437
438                 phydev = tmp_phydev;
439                 break; /* found it */
440         }
441
442         /* now we are supposed to have a proper phydev, to attach to... */
443         if (!phydev) {
444                 printk(KERN_INFO "%s: Don't found any phy device at all\n",
445                         dev->name);
446                 return -ENODEV;
447         }
448
449 #if defined(CONFIG_BFIN_MAC_RMII)
450         phydev = phy_connect(dev, phydev->dev.bus_id, &bf537_adjust_link, 0,
451                         PHY_INTERFACE_MODE_RMII);
452 #else
453         phydev = phy_connect(dev, phydev->dev.bus_id, &bf537_adjust_link, 0,
454                         PHY_INTERFACE_MODE_MII);
455 #endif
456
457         if (IS_ERR(phydev)) {
458                 printk(KERN_ERR "%s: Could not attach to PHY\n", dev->name);
459                 return PTR_ERR(phydev);
460         }
461
462         /* mask with MAC supported features */
463         phydev->supported &= (SUPPORTED_10baseT_Half
464                               | SUPPORTED_10baseT_Full
465                               | SUPPORTED_100baseT_Half
466                               | SUPPORTED_100baseT_Full
467                               | SUPPORTED_Autoneg
468                               | SUPPORTED_Pause | SUPPORTED_Asym_Pause
469                               | SUPPORTED_MII
470                               | SUPPORTED_TP);
471
472         phydev->advertising = phydev->supported;
473
474         lp->old_link = 0;
475         lp->old_speed = 0;
476         lp->old_duplex = -1;
477         lp->phydev = phydev;
478
479         printk(KERN_INFO "%s: attached PHY driver [%s] "
480                "(mii_bus:phy_addr=%s, irq=%d)\n",
481                DRV_NAME, phydev->drv->name, phydev->dev.bus_id, phydev->irq);
482
483         return 0;
484 }
485
486 /**************************************************************************/
487 void setup_system_regs(struct net_device *dev)
488 {
489         unsigned short sysctl;
490
491         /*
492          * Odd word alignment for Receive Frame DMA word
493          * Configure checksum support and rcve frame word alignment
494          */
495         sysctl = bfin_read_EMAC_SYSCTL();
496 #if defined(BFIN_MAC_CSUM_OFFLOAD)
497         sysctl |= RXDWA | RXCKS;
498 #else
499         sysctl |= RXDWA;
500 #endif
501         bfin_write_EMAC_SYSCTL(sysctl);
502
503         bfin_write_EMAC_MMC_CTL(RSTC | CROLL);
504
505         /* Initialize the TX DMA channel registers */
506         bfin_write_DMA2_X_COUNT(0);
507         bfin_write_DMA2_X_MODIFY(4);
508         bfin_write_DMA2_Y_COUNT(0);
509         bfin_write_DMA2_Y_MODIFY(0);
510
511         /* Initialize the RX DMA channel registers */
512         bfin_write_DMA1_X_COUNT(0);
513         bfin_write_DMA1_X_MODIFY(4);
514         bfin_write_DMA1_Y_COUNT(0);
515         bfin_write_DMA1_Y_MODIFY(0);
516 }
517
518 static void setup_mac_addr(u8 *mac_addr)
519 {
520         u32 addr_low = le32_to_cpu(*(__le32 *) & mac_addr[0]);
521         u16 addr_hi = le16_to_cpu(*(__le16 *) & mac_addr[4]);
522
523         /* this depends on a little-endian machine */
524         bfin_write_EMAC_ADDRLO(addr_low);
525         bfin_write_EMAC_ADDRHI(addr_hi);
526 }
527
528 static int bf537mac_set_mac_address(struct net_device *dev, void *p)
529 {
530         struct sockaddr *addr = p;
531         if (netif_running(dev))
532                 return -EBUSY;
533         memcpy(dev->dev_addr, addr->sa_data, dev->addr_len);
534         setup_mac_addr(dev->dev_addr);
535         return 0;
536 }
537
538 static void adjust_tx_list(void)
539 {
540         int timeout_cnt = MAX_TIMEOUT_CNT;
541
542         if (tx_list_head->status.status_word != 0
543             && current_tx_ptr != tx_list_head) {
544                 goto adjust_head;       /* released something, just return; */
545         }
546
547         /*
548          * if nothing released, check wait condition
549          * current's next can not be the head,
550          * otherwise the dma will not stop as we want
551          */
552         if (current_tx_ptr->next->next == tx_list_head) {
553                 while (tx_list_head->status.status_word == 0) {
554                         mdelay(10);
555                         if (tx_list_head->status.status_word != 0
556                             || !(bfin_read_DMA2_IRQ_STATUS() & 0x08)) {
557                                 goto adjust_head;
558                         }
559                         if (timeout_cnt-- < 0) {
560                                 printk(KERN_ERR DRV_NAME
561                                 ": wait for adjust tx list head timeout\n");
562                                 break;
563                         }
564                 }
565                 if (tx_list_head->status.status_word != 0) {
566                         goto adjust_head;
567                 }
568         }
569
570         return;
571
572 adjust_head:
573         do {
574                 tx_list_head->desc_a.config &= ~DMAEN;
575                 tx_list_head->status.status_word = 0;
576                 if (tx_list_head->skb) {
577                         dev_kfree_skb(tx_list_head->skb);
578                         tx_list_head->skb = NULL;
579                 } else {
580                         printk(KERN_ERR DRV_NAME
581                                ": no sk_buff in a transmitted frame!\n");
582                 }
583                 tx_list_head = tx_list_head->next;
584         } while (tx_list_head->status.status_word != 0
585                  && current_tx_ptr != tx_list_head);
586         return;
587
588 }
589
590 static int bf537mac_hard_start_xmit(struct sk_buff *skb,
591                                 struct net_device *dev)
592 {
593         struct bf537mac_local *lp = netdev_priv(dev);
594         unsigned int data;
595
596         current_tx_ptr->skb = skb;
597
598         /*
599          * Is skb->data always 16-bit aligned?
600          * Do we need to memcpy((char *)(tail->packet + 2), skb->data, len)?
601          */
602         if ((((unsigned int)(skb->data)) & 0x02) == 2) {
603                 /* move skb->data to current_tx_ptr payload */
604                 data = (unsigned int)(skb->data) - 2;
605                 *((unsigned short *)data) = (unsigned short)(skb->len);
606                 current_tx_ptr->desc_a.start_addr = (unsigned long)data;
607                 /* this is important! */
608                 blackfin_dcache_flush_range(data, (data + (skb->len)) + 2);
609
610         } else {
611                 *((unsigned short *)(current_tx_ptr->packet)) =
612                     (unsigned short)(skb->len);
613                 memcpy((char *)(current_tx_ptr->packet + 2), skb->data,
614                        (skb->len));
615                 current_tx_ptr->desc_a.start_addr =
616                     (unsigned long)current_tx_ptr->packet;
617                 if (current_tx_ptr->status.status_word != 0)
618                         current_tx_ptr->status.status_word = 0;
619                 blackfin_dcache_flush_range((unsigned int)current_tx_ptr->
620                                             packet,
621                                             (unsigned int)(current_tx_ptr->
622                                                            packet + skb->len) +
623                                             2);
624         }
625
626         /* enable this packet's dma */
627         current_tx_ptr->desc_a.config |= DMAEN;
628
629         /* tx dma is running, just return */
630         if (bfin_read_DMA2_IRQ_STATUS() & 0x08)
631                 goto out;
632
633         /* tx dma is not running */
634         bfin_write_DMA2_NEXT_DESC_PTR(&(current_tx_ptr->desc_a));
635         /* dma enabled, read from memory, size is 6 */
636         bfin_write_DMA2_CONFIG(current_tx_ptr->desc_a.config);
637         /* Turn on the EMAC tx */
638         bfin_write_EMAC_OPMODE(bfin_read_EMAC_OPMODE() | TE);
639
640 out:
641         adjust_tx_list();
642         current_tx_ptr = current_tx_ptr->next;
643         dev->trans_start = jiffies;
644         dev->stats.tx_packets++;
645         dev->stats.tx_bytes += (skb->len);
646         return 0;
647 }
648
649 static void bf537mac_rx(struct net_device *dev)
650 {
651         struct sk_buff *skb, *new_skb;
652         struct bf537mac_local *lp = netdev_priv(dev);
653         unsigned short len;
654
655         /* allocate a new skb for next time receive */
656         skb = current_rx_ptr->skb;
657         new_skb = dev_alloc_skb(PKT_BUF_SZ + 2);
658         if (!new_skb) {
659                 printk(KERN_NOTICE DRV_NAME
660                        ": rx: low on mem - packet dropped\n");
661                 dev->stats.rx_dropped++;
662                 goto out;
663         }
664         /* reserve 2 bytes for RXDWA padding */
665         skb_reserve(new_skb, 2);
666         current_rx_ptr->skb = new_skb;
667         current_rx_ptr->desc_a.start_addr = (unsigned long)new_skb->data - 2;
668
669         len = (unsigned short)((current_rx_ptr->status.status_word) & RX_FRLEN);
670         skb_put(skb, len);
671         blackfin_dcache_invalidate_range((unsigned long)skb->head,
672                                          (unsigned long)skb->tail);
673
674         dev->last_rx = jiffies;
675         skb->dev = dev;
676         skb->protocol = eth_type_trans(skb, dev);
677 #if defined(BFIN_MAC_CSUM_OFFLOAD)
678         skb->csum = current_rx_ptr->status.ip_payload_csum;
679         skb->ip_summed = CHECKSUM_COMPLETE;
680 #endif
681
682         netif_rx(skb);
683         dev->stats.rx_packets++;
684         dev->stats.rx_bytes += len;
685         current_rx_ptr->status.status_word = 0x00000000;
686         current_rx_ptr = current_rx_ptr->next;
687
688 out:
689         return;
690 }
691
692 /* interrupt routine to handle rx and error signal */
693 static irqreturn_t bf537mac_interrupt(int irq, void *dev_id)
694 {
695         struct net_device *dev = dev_id;
696         int number = 0;
697
698 get_one_packet:
699         if (current_rx_ptr->status.status_word == 0) {
700                 /* no more new packet received */
701                 if (number == 0) {
702                         if (current_rx_ptr->next->status.status_word != 0) {
703                                 current_rx_ptr = current_rx_ptr->next;
704                                 goto real_rx;
705                         }
706                 }
707                 bfin_write_DMA1_IRQ_STATUS(bfin_read_DMA1_IRQ_STATUS() |
708                                            DMA_DONE | DMA_ERR);
709                 return IRQ_HANDLED;
710         }
711
712 real_rx:
713         bf537mac_rx(dev);
714         number++;
715         goto get_one_packet;
716 }
717
718 #ifdef CONFIG_NET_POLL_CONTROLLER
719 static void bf537mac_poll(struct net_device *dev)
720 {
721         disable_irq(IRQ_MAC_RX);
722         bf537mac_interrupt(IRQ_MAC_RX, dev);
723         enable_irq(IRQ_MAC_RX);
724 }
725 #endif                          /* CONFIG_NET_POLL_CONTROLLER */
726
727 static void bf537mac_disable(void)
728 {
729         unsigned int opmode;
730
731         opmode = bfin_read_EMAC_OPMODE();
732         opmode &= (~RE);
733         opmode &= (~TE);
734         /* Turn off the EMAC */
735         bfin_write_EMAC_OPMODE(opmode);
736 }
737
738 /*
739  * Enable Interrupts, Receive, and Transmit
740  */
741 static void bf537mac_enable(void)
742 {
743         u32 opmode;
744
745         pr_debug("%s: %s\n", DRV_NAME, __FUNCTION__);
746
747         /* Set RX DMA */
748         bfin_write_DMA1_NEXT_DESC_PTR(&(rx_list_head->desc_a));
749         bfin_write_DMA1_CONFIG(rx_list_head->desc_a.config);
750
751         /* Wait MII done */
752         mdio_poll();
753
754         /* We enable only RX here */
755         /* ASTP   : Enable Automatic Pad Stripping
756            PR     : Promiscuous Mode for test
757            PSF    : Receive frames with total length less than 64 bytes.
758            FDMODE : Full Duplex Mode
759            LB     : Internal Loopback for test
760            RE     : Receiver Enable */
761         opmode = bfin_read_EMAC_OPMODE();
762         if (opmode & FDMODE)
763                 opmode |= PSF;
764         else
765                 opmode |= DRO | DC | PSF;
766         opmode |= RE;
767
768 #if defined(CONFIG_BFIN_MAC_RMII)
769         opmode |= RMII; /* For Now only 100MBit are supported */
770 #ifdef CONFIG_BF_REV_0_2
771         opmode |= TE;
772 #endif
773 #endif
774         /* Turn on the EMAC rx */
775         bfin_write_EMAC_OPMODE(opmode);
776 }
777
778 /* Our watchdog timed out. Called by the networking layer */
779 static void bf537mac_timeout(struct net_device *dev)
780 {
781         pr_debug("%s: %s\n", dev->name, __FUNCTION__);
782
783         bf537mac_disable();
784
785         /* reset tx queue */
786         tx_list_tail = tx_list_head->next;
787
788         bf537mac_enable();
789
790         /* We can accept TX packets again */
791         dev->trans_start = jiffies;
792         netif_wake_queue(dev);
793 }
794
795 /*
796  * This routine will, depending on the values passed to it,
797  * either make it accept multicast packets, go into
798  * promiscuous mode (for TCPDUMP and cousins) or accept
799  * a select set of multicast packets
800  */
801 static void bf537mac_set_multicast_list(struct net_device *dev)
802 {
803         u32 sysctl;
804
805         if (dev->flags & IFF_PROMISC) {
806                 printk(KERN_INFO "%s: set to promisc mode\n", dev->name);
807                 sysctl = bfin_read_EMAC_OPMODE();
808                 sysctl |= RAF;
809                 bfin_write_EMAC_OPMODE(sysctl);
810         } else if (dev->flags & IFF_ALLMULTI || dev->mc_count) {
811                 /* accept all multicast */
812                 sysctl = bfin_read_EMAC_OPMODE();
813                 sysctl |= PAM;
814                 bfin_write_EMAC_OPMODE(sysctl);
815         } else {
816                 /* clear promisc or multicast mode */
817                 sysctl = bfin_read_EMAC_OPMODE();
818                 sysctl &= ~(RAF | PAM);
819                 bfin_write_EMAC_OPMODE(sysctl);
820         }
821 }
822
823 /*
824  * this puts the device in an inactive state
825  */
826 static void bf537mac_shutdown(struct net_device *dev)
827 {
828         /* Turn off the EMAC */
829         bfin_write_EMAC_OPMODE(0x00000000);
830         /* Turn off the EMAC RX DMA */
831         bfin_write_DMA1_CONFIG(0x0000);
832         bfin_write_DMA2_CONFIG(0x0000);
833 }
834
835 /*
836  * Open and Initialize the interface
837  *
838  * Set up everything, reset the card, etc..
839  */
840 static int bf537mac_open(struct net_device *dev)
841 {
842         struct bf537mac_local *lp = netdev_priv(dev);
843         int retval;
844         pr_debug("%s: %s\n", dev->name, __FUNCTION__);
845
846         /*
847          * Check that the address is valid.  If its not, refuse
848          * to bring the device up.  The user must specify an
849          * address using ifconfig eth0 hw ether xx:xx:xx:xx:xx:xx
850          */
851         if (!is_valid_ether_addr(dev->dev_addr)) {
852                 printk(KERN_WARNING DRV_NAME ": no valid ethernet hw addr\n");
853                 return -EINVAL;
854         }
855
856         /* initial rx and tx list */
857         retval = desc_list_init();
858
859         if (retval)
860                 return retval;
861
862         phy_start(lp->phydev);
863         setup_system_regs(dev);
864         bf537mac_disable();
865         bf537mac_enable();
866
867         pr_debug("hardware init finished\n");
868         netif_start_queue(dev);
869         netif_carrier_on(dev);
870
871         return 0;
872 }
873
874 /*
875  *
876  * this makes the board clean up everything that it can
877  * and not talk to the outside world.   Caused by
878  * an 'ifconfig ethX down'
879  */
880 static int bf537mac_close(struct net_device *dev)
881 {
882         struct bf537mac_local *lp = netdev_priv(dev);
883         pr_debug("%s: %s\n", dev->name, __FUNCTION__);
884
885         netif_stop_queue(dev);
886         netif_carrier_off(dev);
887
888         phy_stop(lp->phydev);
889
890         /* clear everything */
891         bf537mac_shutdown(dev);
892
893         /* free the rx/tx buffers */
894         desc_list_free();
895
896         return 0;
897 }
898
899 static int __init bf537mac_probe(struct net_device *dev)
900 {
901         struct bf537mac_local *lp = netdev_priv(dev);
902         int retval;
903         int i;
904
905         /* Grab the MAC address in the MAC */
906         *(__le32 *) (&(dev->dev_addr[0])) = cpu_to_le32(bfin_read_EMAC_ADDRLO());
907         *(__le16 *) (&(dev->dev_addr[4])) = cpu_to_le16((u16) bfin_read_EMAC_ADDRHI());
908
909         /* probe mac */
910         /*todo: how to proble? which is revision_register */
911         bfin_write_EMAC_ADDRLO(0x12345678);
912         if (bfin_read_EMAC_ADDRLO() != 0x12345678) {
913                 pr_debug("can't detect bf537 mac!\n");
914                 retval = -ENODEV;
915                 goto err_out;
916         }
917
918         /* set the GPIO pins to Ethernet mode */
919         retval = setup_pin_mux(1);
920         if (retval)
921                 return retval;
922
923         /*Is it valid? (Did bootloader initialize it?) */
924         if (!is_valid_ether_addr(dev->dev_addr)) {
925                 /* Grab the MAC from the board somehow - this is done in the
926                    arch/blackfin/mach-bf537/boards/eth_mac.c */
927                 bfin_get_ether_addr(dev->dev_addr);
928         }
929
930         /* If still not valid, get a random one */
931         if (!is_valid_ether_addr(dev->dev_addr)) {
932                 random_ether_addr(dev->dev_addr);
933         }
934
935         setup_mac_addr(dev->dev_addr);
936
937         /* MDIO bus initial */
938         lp->mii_bus.priv = dev;
939         lp->mii_bus.read = mdiobus_read;
940         lp->mii_bus.write = mdiobus_write;
941         lp->mii_bus.reset = mdiobus_reset;
942         lp->mii_bus.name = "bfin_mac_mdio";
943         lp->mii_bus.id = 0;
944         lp->mii_bus.irq = kmalloc(sizeof(int)*PHY_MAX_ADDR, GFP_KERNEL);
945         for (i = 0; i < PHY_MAX_ADDR; ++i)
946                 lp->mii_bus.irq[i] = PHY_POLL;
947
948         mdiobus_register(&lp->mii_bus);
949
950         retval = mii_probe(dev);
951         if (retval)
952                 return retval;
953
954         /* Fill in the fields of the device structure with ethernet values. */
955         ether_setup(dev);
956
957         dev->open = bf537mac_open;
958         dev->stop = bf537mac_close;
959         dev->hard_start_xmit = bf537mac_hard_start_xmit;
960         dev->set_mac_address = bf537mac_set_mac_address;
961         dev->tx_timeout = bf537mac_timeout;
962         dev->set_multicast_list = bf537mac_set_multicast_list;
963 #ifdef CONFIG_NET_POLL_CONTROLLER
964         dev->poll_controller = bf537mac_poll;
965 #endif
966
967         spin_lock_init(&lp->lock);
968
969         /* now, enable interrupts */
970         /* register irq handler */
971         if (request_irq
972             (IRQ_MAC_RX, bf537mac_interrupt, IRQF_DISABLED | IRQF_SHARED,
973              "BFIN537_MAC_RX", dev)) {
974                 printk(KERN_WARNING DRV_NAME
975                        ": Unable to attach BlackFin MAC RX interrupt\n");
976                 return -EBUSY;
977         }
978
979
980         retval = register_netdev(dev);
981         if (retval == 0) {
982                 /* now, print out the card info, in a short format.. */
983                 printk(KERN_INFO "%s: Version %s, %s\n",
984                          DRV_NAME, DRV_VERSION, DRV_DESC);
985         }
986
987 err_out:
988         return retval;
989 }
990
991 static int bfin_mac_probe(struct platform_device *pdev)
992 {
993         struct net_device *ndev;
994
995         ndev = alloc_etherdev(sizeof(struct bf537mac_local));
996         if (!ndev) {
997                 printk(KERN_WARNING DRV_NAME ": could not allocate device\n");
998                 return -ENOMEM;
999         }
1000
1001         SET_NETDEV_DEV(ndev, &pdev->dev);
1002
1003         platform_set_drvdata(pdev, ndev);
1004
1005         if (bf537mac_probe(ndev) != 0) {
1006                 platform_set_drvdata(pdev, NULL);
1007                 free_netdev(ndev);
1008                 printk(KERN_WARNING DRV_NAME ": not found\n");
1009                 return -ENODEV;
1010         }
1011
1012         return 0;
1013 }
1014
1015 static int bfin_mac_remove(struct platform_device *pdev)
1016 {
1017         struct net_device *ndev = platform_get_drvdata(pdev);
1018
1019         platform_set_drvdata(pdev, NULL);
1020
1021         unregister_netdev(ndev);
1022
1023         free_irq(IRQ_MAC_RX, ndev);
1024
1025         free_netdev(ndev);
1026
1027         setup_pin_mux(0);
1028
1029         return 0;
1030 }
1031
1032 #ifdef CONFIG_PM
1033 static int bfin_mac_suspend(struct platform_device *pdev, pm_message_t mesg)
1034 {
1035         struct net_device *net_dev = platform_get_drvdata(pdev);
1036
1037         if (netif_running(net_dev))
1038                 bf537mac_close(net_dev);
1039
1040         return 0;
1041 }
1042
1043 static int bfin_mac_resume(struct platform_device *pdev)
1044 {
1045         struct net_device *net_dev = platform_get_drvdata(pdev);
1046
1047         if (netif_running(net_dev))
1048                 bf537mac_open(net_dev);
1049
1050         return 0;
1051 }
1052 #else
1053 #define bfin_mac_suspend NULL
1054 #define bfin_mac_resume NULL
1055 #endif  /* CONFIG_PM */
1056
1057 static struct platform_driver bfin_mac_driver = {
1058         .probe = bfin_mac_probe,
1059         .remove = bfin_mac_remove,
1060         .resume = bfin_mac_resume,
1061         .suspend = bfin_mac_suspend,
1062         .driver = {
1063                    .name = DRV_NAME,
1064                    },
1065 };
1066
1067 static int __init bfin_mac_init(void)
1068 {
1069         return platform_driver_register(&bfin_mac_driver);
1070 }
1071
1072 module_init(bfin_mac_init);
1073
1074 static void __exit bfin_mac_cleanup(void)
1075 {
1076         platform_driver_unregister(&bfin_mac_driver);
1077 }
1078
1079 module_exit(bfin_mac_cleanup);