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sched: push RT tasks from overloaded CPUs
[linux-2.6/kmemtrace.git] / drivers / net / bmac.c
bloba42bd19646d371e0ce75245280e446215495258e
1 /*
2 * Network device driver for the BMAC ethernet controller on
3 * Apple Powermacs. Assumes it's under a DBDMA controller.
4 *
5 * Copyright (C) 1998 Randy Gobbel.
6 *
7 * May 1999, Al Viro: proper release of /proc/net/bmac entry, switched to
8 * dynamic procfs inode.
9 */
10 #include <linux/module.h>
11 #include <linux/kernel.h>
12 #include <linux/netdevice.h>
13 #include <linux/etherdevice.h>
14 #include <linux/delay.h>
15 #include <linux/string.h>
16 #include <linux/timer.h>
17 #include <linux/proc_fs.h>
18 #include <linux/init.h>
19 #include <linux/spinlock.h>
20 #include <linux/crc32.h>
21 #include <linux/bitrev.h>
22 #include <linux/ethtool.h>
23 #include <asm/prom.h>
24 #include <asm/dbdma.h>
25 #include <asm/io.h>
26 #include <asm/page.h>
27 #include <asm/pgtable.h>
28 #include <asm/machdep.h>
29 #include <asm/pmac_feature.h>
30 #include <asm/macio.h>
31 #include <asm/irq.h>
32
33 #include "bmac.h"
34
35 #define trunc_page(x) ((void *)(((unsigned long)(x)) & ~((unsigned long)(PAGE_SIZE - 1))))
36 #define round_page(x) trunc_page(((unsigned long)(x)) + ((unsigned long)(PAGE_SIZE - 1)))
37
38 /*
39 * CRC polynomial - used in working out multicast filter bits.
40 */
41 #define ENET_CRCPOLY 0x04c11db7
42
43 /* switch to use multicast code lifted from sunhme driver */
44 #define SUNHME_MULTICAST
45
46 #define N_RX_RING 64
47 #define N_TX_RING 32
48 #define MAX_TX_ACTIVE 1
49 #define ETHERCRC 4
50 #define ETHERMINPACKET 64
51 #define ETHERMTU 1500
52 #define RX_BUFLEN (ETHERMTU + 14 + ETHERCRC + 2)
53 #define TX_TIMEOUT HZ /* 1 second */
54
55 /* Bits in transmit DMA status */
56 #define TX_DMA_ERR 0x80
57
58 #define XXDEBUG(args)
59
60 struct bmac_data {
61 /* volatile struct bmac *bmac; */
62 struct sk_buff_head *queue;
63 volatile struct dbdma_regs __iomem *tx_dma;
64 int tx_dma_intr;
65 volatile struct dbdma_regs __iomem *rx_dma;
66 int rx_dma_intr;
67 volatile struct dbdma_cmd *tx_cmds; /* xmit dma command list */
68 volatile struct dbdma_cmd *rx_cmds; /* recv dma command list */
69 struct macio_dev *mdev;
70 int is_bmac_plus;
71 struct sk_buff *rx_bufs[N_RX_RING];
72 int rx_fill;
73 int rx_empty;
74 struct sk_buff *tx_bufs[N_TX_RING];
75 int tx_fill;
76 int tx_empty;
77 unsigned char tx_fullup;
78 struct timer_list tx_timeout;
79 int timeout_active;
80 int sleeping;
81 int opened;
82 unsigned short hash_use_count[64];
83 unsigned short hash_table_mask[4];
84 spinlock_t lock;
85 };
86
87 #if 0 /* Move that to ethtool */
88
89 typedef struct bmac_reg_entry {
90 char *name;
91 unsigned short reg_offset;
92 } bmac_reg_entry_t;
93
94 #define N_REG_ENTRIES 31
95
96 static bmac_reg_entry_t reg_entries[N_REG_ENTRIES] = {
97 {"MEMADD", MEMADD},
98 {"MEMDATAHI", MEMDATAHI},
99 {"MEMDATALO", MEMDATALO},
100 {"TXPNTR", TXPNTR},
101 {"RXPNTR", RXPNTR},
102 {"IPG1", IPG1},
103 {"IPG2", IPG2},
104 {"ALIMIT", ALIMIT},
105 {"SLOT", SLOT},
106 {"PALEN", PALEN},
107 {"PAPAT", PAPAT},
108 {"TXSFD", TXSFD},
109 {"JAM", JAM},
110 {"TXCFG", TXCFG},
111 {"TXMAX", TXMAX},
112 {"TXMIN", TXMIN},
113 {"PAREG", PAREG},
114 {"DCNT", DCNT},
115 {"NCCNT", NCCNT},
116 {"NTCNT", NTCNT},
117 {"EXCNT", EXCNT},
118 {"LTCNT", LTCNT},
119 {"TXSM", TXSM},
120 {"RXCFG", RXCFG},
121 {"RXMAX", RXMAX},
122 {"RXMIN", RXMIN},
123 {"FRCNT", FRCNT},
124 {"AECNT", AECNT},
125 {"FECNT", FECNT},
126 {"RXSM", RXSM},
127 {"RXCV", RXCV}
128 };
129
130 #endif
131
132 static unsigned char *bmac_emergency_rxbuf;
133
134 /*
135 * Number of bytes of private data per BMAC: allow enough for
136 * the rx and tx dma commands plus a branch dma command each,
137 * and another 16 bytes to allow us to align the dma command
138 * buffers on a 16 byte boundary.
139 */
140 #define PRIV_BYTES (sizeof(struct bmac_data) \
141 + (N_RX_RING + N_TX_RING + 4) * sizeof(struct dbdma_cmd) \
142 + sizeof(struct sk_buff_head))
143
144 static int bmac_open(struct net_device *dev);
145 static int bmac_close(struct net_device *dev);
146 static int bmac_transmit_packet(struct sk_buff *skb, struct net_device *dev);
147 static void bmac_set_multicast(struct net_device *dev);
148 static void bmac_reset_and_enable(struct net_device *dev);
149 static void bmac_start_chip(struct net_device *dev);
150 static void bmac_init_chip(struct net_device *dev);
151 static void bmac_init_registers(struct net_device *dev);
152 static void bmac_enable_and_reset_chip(struct net_device *dev);
153 static int bmac_set_address(struct net_device *dev, void *addr);
154 static irqreturn_t bmac_misc_intr(int irq, void *dev_id);
155 static irqreturn_t bmac_txdma_intr(int irq, void *dev_id);
156 static irqreturn_t bmac_rxdma_intr(int irq, void *dev_id);
157 static void bmac_set_timeout(struct net_device *dev);
158 static void bmac_tx_timeout(unsigned long data);
159 static int bmac_output(struct sk_buff *skb, struct net_device *dev);
160 static void bmac_start(struct net_device *dev);
161
162 #define DBDMA_SET(x) ( ((x) | (x) << 16) )
163 #define DBDMA_CLEAR(x) ( (x) << 16)
164
165 static inline void
166 dbdma_st32(volatile __u32 __iomem *a, unsigned long x)
167 {
168 __asm__ volatile( "stwbrx %0,0,%1" : : "r" (x), "r" (a) : "memory");
169 return;
170 }
171
172 static inline unsigned long
173 dbdma_ld32(volatile __u32 __iomem *a)
174 {
175 __u32 swap;
176 __asm__ volatile ("lwbrx %0,0,%1" : "=r" (swap) : "r" (a));
177 return swap;
178 }
179
180 static void
181 dbdma_continue(volatile struct dbdma_regs __iomem *dmap)
182 {
183 dbdma_st32(&dmap->control,
184 DBDMA_SET(RUN|WAKE) | DBDMA_CLEAR(PAUSE|DEAD));
185 eieio();
186 }
187
188 static void
189 dbdma_reset(volatile struct dbdma_regs __iomem *dmap)
190 {
191 dbdma_st32(&dmap->control,
192 DBDMA_CLEAR(ACTIVE|DEAD|WAKE|FLUSH|PAUSE|RUN));
193 eieio();
194 while (dbdma_ld32(&dmap->status) & RUN)
195 eieio();
196 }
197
198 static void
199 dbdma_setcmd(volatile struct dbdma_cmd *cp,
200 unsigned short cmd, unsigned count, unsigned long addr,
201 unsigned long cmd_dep)
202 {
203 out_le16(&cp->command, cmd);
204 out_le16(&cp->req_count, count);
205 out_le32(&cp->phy_addr, addr);
206 out_le32(&cp->cmd_dep, cmd_dep);
207 out_le16(&cp->xfer_status, 0);
208 out_le16(&cp->res_count, 0);
209 }
210
211 static inline
212 void bmwrite(struct net_device *dev, unsigned long reg_offset, unsigned data )
213 {
214 out_le16((void __iomem *)dev->base_addr + reg_offset, data);
215 }
216
217
218 static inline
219 unsigned short bmread(struct net_device *dev, unsigned long reg_offset )
220 {
221 return in_le16((void __iomem *)dev->base_addr + reg_offset);
222 }
223
224 static void
225 bmac_enable_and_reset_chip(struct net_device *dev)
226 {
227 struct bmac_data *bp = netdev_priv(dev);
228 volatile struct dbdma_regs __iomem *rd = bp->rx_dma;
229 volatile struct dbdma_regs __iomem *td = bp->tx_dma;
230
231 if (rd)
232 dbdma_reset(rd);
233 if (td)
234 dbdma_reset(td);
235
236 pmac_call_feature(PMAC_FTR_BMAC_ENABLE, macio_get_of_node(bp->mdev), 0, 1);
237 }
238
239 #define MIFDELAY udelay(10)
240
241 static unsigned int
242 bmac_mif_readbits(struct net_device *dev, int nb)
243 {
244 unsigned int val = 0;
245
246 while (--nb >= 0) {
247 bmwrite(dev, MIFCSR, 0);
248 MIFDELAY;
249 if (bmread(dev, MIFCSR) & 8)
250 val |= 1 << nb;
251 bmwrite(dev, MIFCSR, 1);
252 MIFDELAY;
253 }
254 bmwrite(dev, MIFCSR, 0);
255 MIFDELAY;
256 bmwrite(dev, MIFCSR, 1);
257 MIFDELAY;
258 return val;
259 }
260
261 static void
262 bmac_mif_writebits(struct net_device *dev, unsigned int val, int nb)
263 {
264 int b;
265
266 while (--nb >= 0) {
267 b = (val & (1 << nb))? 6: 4;
268 bmwrite(dev, MIFCSR, b);
269 MIFDELAY;
270 bmwrite(dev, MIFCSR, b|1);
271 MIFDELAY;
272 }
273 }
274
275 static unsigned int
276 bmac_mif_read(struct net_device *dev, unsigned int addr)
277 {
278 unsigned int val;
279
280 bmwrite(dev, MIFCSR, 4);
281 MIFDELAY;
282 bmac_mif_writebits(dev, ~0U, 32);
283 bmac_mif_writebits(dev, 6, 4);
284 bmac_mif_writebits(dev, addr, 10);
285 bmwrite(dev, MIFCSR, 2);
286 MIFDELAY;
287 bmwrite(dev, MIFCSR, 1);
288 MIFDELAY;
289 val = bmac_mif_readbits(dev, 17);
290 bmwrite(dev, MIFCSR, 4);
291 MIFDELAY;
292 return val;
293 }
294
295 static void
296 bmac_mif_write(struct net_device *dev, unsigned int addr, unsigned int val)
297 {
298 bmwrite(dev, MIFCSR, 4);
299 MIFDELAY;
300 bmac_mif_writebits(dev, ~0U, 32);
301 bmac_mif_writebits(dev, 5, 4);
302 bmac_mif_writebits(dev, addr, 10);
303 bmac_mif_writebits(dev, 2, 2);
304 bmac_mif_writebits(dev, val, 16);
305 bmac_mif_writebits(dev, 3, 2);
306 }
307
308 static void
309 bmac_init_registers(struct net_device *dev)
310 {
311 struct bmac_data *bp = netdev_priv(dev);
312 volatile unsigned short regValue;
313 unsigned short *pWord16;
314 int i;
315
316 /* XXDEBUG(("bmac: enter init_registers\n")); */
317
318 bmwrite(dev, RXRST, RxResetValue);
319 bmwrite(dev, TXRST, TxResetBit);
320
321 i = 100;
322 do {
323 --i;
324 udelay(10000);
325 regValue = bmread(dev, TXRST); /* wait for reset to clear..acknowledge */
326 } while ((regValue & TxResetBit) && i > 0);
327
328 if (!bp->is_bmac_plus) {
329 regValue = bmread(dev, XCVRIF);
330 regValue |= ClkBit | SerialMode | COLActiveLow;
331 bmwrite(dev, XCVRIF, regValue);
332 udelay(10000);
333 }
334
335 bmwrite(dev, RSEED, (unsigned short)0x1968);
336
337 regValue = bmread(dev, XIFC);
338 regValue |= TxOutputEnable;
339 bmwrite(dev, XIFC, regValue);
340
341 bmread(dev, PAREG);
342
343 /* set collision counters to 0 */
344 bmwrite(dev, NCCNT, 0);
345 bmwrite(dev, NTCNT, 0);
346 bmwrite(dev, EXCNT, 0);
347 bmwrite(dev, LTCNT, 0);
348
349 /* set rx counters to 0 */
350 bmwrite(dev, FRCNT, 0);
351 bmwrite(dev, LECNT, 0);
352 bmwrite(dev, AECNT, 0);
353 bmwrite(dev, FECNT, 0);
354 bmwrite(dev, RXCV, 0);
355
356 /* set tx fifo information */
357 bmwrite(dev, TXTH, 4); /* 4 octets before tx starts */
358
359 bmwrite(dev, TXFIFOCSR, 0); /* first disable txFIFO */
360 bmwrite(dev, TXFIFOCSR, TxFIFOEnable );
361
362 /* set rx fifo information */
363 bmwrite(dev, RXFIFOCSR, 0); /* first disable rxFIFO */
364 bmwrite(dev, RXFIFOCSR, RxFIFOEnable );
365
366 //bmwrite(dev, TXCFG, TxMACEnable); /* TxNeverGiveUp maybe later */
367 bmread(dev, STATUS); /* read it just to clear it */
368
369 /* zero out the chip Hash Filter registers */
370 for (i=0; i<4; i++) bp->hash_table_mask[i] = 0;
371 bmwrite(dev, BHASH3, bp->hash_table_mask[0]); /* bits 15 - 0 */
372 bmwrite(dev, BHASH2, bp->hash_table_mask[1]); /* bits 31 - 16 */
373 bmwrite(dev, BHASH1, bp->hash_table_mask[2]); /* bits 47 - 32 */
374 bmwrite(dev, BHASH0, bp->hash_table_mask[3]); /* bits 63 - 48 */
375
376 pWord16 = (unsigned short *)dev->dev_addr;
377 bmwrite(dev, MADD0, *pWord16++);
378 bmwrite(dev, MADD1, *pWord16++);
379 bmwrite(dev, MADD2, *pWord16);
380
381 bmwrite(dev, RXCFG, RxCRCNoStrip | RxHashFilterEnable | RxRejectOwnPackets);
382
383 bmwrite(dev, INTDISABLE, EnableNormal);
384
385 return;
386 }
387
388 #if 0
389 static void
390 bmac_disable_interrupts(struct net_device *dev)
391 {
392 bmwrite(dev, INTDISABLE, DisableAll);
393 }
394
395 static void
396 bmac_enable_interrupts(struct net_device *dev)
397 {
398 bmwrite(dev, INTDISABLE, EnableNormal);
399 }
400 #endif
401
402
403 static void
404 bmac_start_chip(struct net_device *dev)
405 {
406 struct bmac_data *bp = netdev_priv(dev);
407 volatile struct dbdma_regs __iomem *rd = bp->rx_dma;
408 unsigned short oldConfig;
409
410 /* enable rx dma channel */
411 dbdma_continue(rd);
412
413 oldConfig = bmread(dev, TXCFG);
414 bmwrite(dev, TXCFG, oldConfig | TxMACEnable );
415
416 /* turn on rx plus any other bits already on (promiscuous possibly) */
417 oldConfig = bmread(dev, RXCFG);
418 bmwrite(dev, RXCFG, oldConfig | RxMACEnable );
419 udelay(20000);
420 }
421
422 static void
423 bmac_init_phy(struct net_device *dev)
424 {
425 unsigned int addr;
426 struct bmac_data *bp = netdev_priv(dev);
427
428 printk(KERN_DEBUG "phy registers:");
429 for (addr = 0; addr < 32; ++addr) {
430 if ((addr & 7) == 0)
431 printk("\n" KERN_DEBUG);
432 printk(" %.4x", bmac_mif_read(dev, addr));
433 }
434 printk("\n");
435 if (bp->is_bmac_plus) {
436 unsigned int capable, ctrl;
437
438 ctrl = bmac_mif_read(dev, 0);
439 capable = ((bmac_mif_read(dev, 1) & 0xf800) >> 6) | 1;
440 if (bmac_mif_read(dev, 4) != capable
441 || (ctrl & 0x1000) == 0) {
442 bmac_mif_write(dev, 4, capable);
443 bmac_mif_write(dev, 0, 0x1200);
444 } else
445 bmac_mif_write(dev, 0, 0x1000);
446 }
447 }
448
449 static void bmac_init_chip(struct net_device *dev)
450 {
451 bmac_init_phy(dev);
452 bmac_init_registers(dev);
453 }
454
455 #ifdef CONFIG_PM
456 static int bmac_suspend(struct macio_dev *mdev, pm_message_t state)
457 {
458 struct net_device* dev = macio_get_drvdata(mdev);
459 struct bmac_data *bp = netdev_priv(dev);
460 unsigned long flags;
461 unsigned short config;
462 int i;
463
464 netif_device_detach(dev);
465 /* prolly should wait for dma to finish & turn off the chip */
466 spin_lock_irqsave(&bp->lock, flags);
467 if (bp->timeout_active) {
468 del_timer(&bp->tx_timeout);
469 bp->timeout_active = 0;
470 }
471 disable_irq(dev->irq);
472 disable_irq(bp->tx_dma_intr);
473 disable_irq(bp->rx_dma_intr);
474 bp->sleeping = 1;
475 spin_unlock_irqrestore(&bp->lock, flags);
476 if (bp->opened) {
477 volatile struct dbdma_regs __iomem *rd = bp->rx_dma;
478 volatile struct dbdma_regs __iomem *td = bp->tx_dma;
479
480 config = bmread(dev, RXCFG);
481 bmwrite(dev, RXCFG, (config & ~RxMACEnable));
482 config = bmread(dev, TXCFG);
483 bmwrite(dev, TXCFG, (config & ~TxMACEnable));
484 bmwrite(dev, INTDISABLE, DisableAll); /* disable all intrs */
485 /* disable rx and tx dma */
486 st_le32(&rd->control, DBDMA_CLEAR(RUN|PAUSE|FLUSH|WAKE)); /* clear run bit */
487 st_le32(&td->control, DBDMA_CLEAR(RUN|PAUSE|FLUSH|WAKE)); /* clear run bit */
488 /* free some skb's */
489 for (i=0; i<N_RX_RING; i++) {
490 if (bp->rx_bufs[i] != NULL) {
491 dev_kfree_skb(bp->rx_bufs[i]);
492 bp->rx_bufs[i] = NULL;
493 }
494 }
495 for (i = 0; i<N_TX_RING; i++) {
496 if (bp->tx_bufs[i] != NULL) {
497 dev_kfree_skb(bp->tx_bufs[i]);
498 bp->tx_bufs[i] = NULL;
499 }
500 }
501 }
502 pmac_call_feature(PMAC_FTR_BMAC_ENABLE, macio_get_of_node(bp->mdev), 0, 0);
503 return 0;
504 }
505
506 static int bmac_resume(struct macio_dev *mdev)
507 {
508 struct net_device* dev = macio_get_drvdata(mdev);
509 struct bmac_data *bp = netdev_priv(dev);
510
511 /* see if this is enough */
512 if (bp->opened)
513 bmac_reset_and_enable(dev);
514
515 enable_irq(dev->irq);
516 enable_irq(bp->tx_dma_intr);
517 enable_irq(bp->rx_dma_intr);
518 netif_device_attach(dev);
519
520 return 0;
521 }
522 #endif /* CONFIG_PM */
523
524 static int bmac_set_address(struct net_device *dev, void *addr)
525 {
526 struct bmac_data *bp = netdev_priv(dev);
527 unsigned char *p = addr;
528 unsigned short *pWord16;
529 unsigned long flags;
530 int i;
531
532 XXDEBUG(("bmac: enter set_address\n"));
533 spin_lock_irqsave(&bp->lock, flags);
534
535 for (i = 0; i < 6; ++i) {
536 dev->dev_addr[i] = p[i];
537 }
538 /* load up the hardware address */
539 pWord16 = (unsigned short *)dev->dev_addr;
540 bmwrite(dev, MADD0, *pWord16++);
541 bmwrite(dev, MADD1, *pWord16++);
542 bmwrite(dev, MADD2, *pWord16);
543
544 spin_unlock_irqrestore(&bp->lock, flags);
545 XXDEBUG(("bmac: exit set_address\n"));
546 return 0;
547 }
548
549 static inline void bmac_set_timeout(struct net_device *dev)
550 {
551 struct bmac_data *bp = netdev_priv(dev);
552 unsigned long flags;
553
554 spin_lock_irqsave(&bp->lock, flags);
555 if (bp->timeout_active)
556 del_timer(&bp->tx_timeout);
557 bp->tx_timeout.expires = jiffies + TX_TIMEOUT;
558 bp->tx_timeout.function = bmac_tx_timeout;
559 bp->tx_timeout.data = (unsigned long) dev;
560 add_timer(&bp->tx_timeout);
561 bp->timeout_active = 1;
562 spin_unlock_irqrestore(&bp->lock, flags);
563 }
564
565 static void
566 bmac_construct_xmt(struct sk_buff *skb, volatile struct dbdma_cmd *cp)
567 {
568 void *vaddr;
569 unsigned long baddr;
570 unsigned long len;
571
572 len = skb->len;
573 vaddr = skb->data;
574 baddr = virt_to_bus(vaddr);
575
576 dbdma_setcmd(cp, (OUTPUT_LAST | INTR_ALWAYS | WAIT_IFCLR), len, baddr, 0);
577 }
578
579 static void
580 bmac_construct_rxbuff(struct sk_buff *skb, volatile struct dbdma_cmd *cp)
581 {
582 unsigned char *addr = skb? skb->data: bmac_emergency_rxbuf;
583
584 dbdma_setcmd(cp, (INPUT_LAST | INTR_ALWAYS), RX_BUFLEN,
585 virt_to_bus(addr), 0);
586 }
587
588 static void
589 bmac_init_tx_ring(struct bmac_data *bp)
590 {
591 volatile struct dbdma_regs __iomem *td = bp->tx_dma;
592
593 memset((char *)bp->tx_cmds, 0, (N_TX_RING+1) * sizeof(struct dbdma_cmd));
594
595 bp->tx_empty = 0;
596 bp->tx_fill = 0;
597 bp->tx_fullup = 0;
598
599 /* put a branch at the end of the tx command list */
600 dbdma_setcmd(&bp->tx_cmds[N_TX_RING],
601 (DBDMA_NOP | BR_ALWAYS), 0, 0, virt_to_bus(bp->tx_cmds));
602
603 /* reset tx dma */
604 dbdma_reset(td);
605 out_le32(&td->wait_sel, 0x00200020);
606 out_le32(&td->cmdptr, virt_to_bus(bp->tx_cmds));
607 }
608
609 static int
610 bmac_init_rx_ring(struct bmac_data *bp)
611 {
612 volatile struct dbdma_regs __iomem *rd = bp->rx_dma;
613 int i;
614 struct sk_buff *skb;
615
616 /* initialize list of sk_buffs for receiving and set up recv dma */
617 memset((char *)bp->rx_cmds, 0,
618 (N_RX_RING + 1) * sizeof(struct dbdma_cmd));
619 for (i = 0; i < N_RX_RING; i++) {
620 if ((skb = bp->rx_bufs[i]) == NULL) {
621 bp->rx_bufs[i] = skb = dev_alloc_skb(RX_BUFLEN+2);
622 if (skb != NULL)
623 skb_reserve(skb, 2);
624 }
625 bmac_construct_rxbuff(skb, &bp->rx_cmds[i]);
626 }
627
628 bp->rx_empty = 0;
629 bp->rx_fill = i;
630
631 /* Put a branch back to the beginning of the receive command list */
632 dbdma_setcmd(&bp->rx_cmds[N_RX_RING],
633 (DBDMA_NOP | BR_ALWAYS), 0, 0, virt_to_bus(bp->rx_cmds));
634
635 /* start rx dma */
636 dbdma_reset(rd);
637 out_le32(&rd->cmdptr, virt_to_bus(bp->rx_cmds));
638
639 return 1;
640 }
641
642
643 static int bmac_transmit_packet(struct sk_buff *skb, struct net_device *dev)
644 {
645 struct bmac_data *bp = netdev_priv(dev);
646 volatile struct dbdma_regs __iomem *td = bp->tx_dma;
647 int i;
648
649 /* see if there's a free slot in the tx ring */
650 /* XXDEBUG(("bmac_xmit_start: empty=%d fill=%d\n", */
651 /* bp->tx_empty, bp->tx_fill)); */
652 i = bp->tx_fill + 1;
653 if (i >= N_TX_RING)
654 i = 0;
655 if (i == bp->tx_empty) {
656 netif_stop_queue(dev);
657 bp->tx_fullup = 1;
658 XXDEBUG(("bmac_transmit_packet: tx ring full\n"));
659 return -1; /* can't take it at the moment */
660 }
661
662 dbdma_setcmd(&bp->tx_cmds[i], DBDMA_STOP, 0, 0, 0);
663
664 bmac_construct_xmt(skb, &bp->tx_cmds[bp->tx_fill]);
665
666 bp->tx_bufs[bp->tx_fill] = skb;
667 bp->tx_fill = i;
668
669 dev->stats.tx_bytes += skb->len;
670
671 dbdma_continue(td);
672
673 return 0;
674 }
675
676 static int rxintcount;
677
678 static irqreturn_t bmac_rxdma_intr(int irq, void *dev_id)
679 {
680 struct net_device *dev = (struct net_device *) dev_id;
681 struct bmac_data *bp = netdev_priv(dev);
682 volatile struct dbdma_regs __iomem *rd = bp->rx_dma;
683 volatile struct dbdma_cmd *cp;
684 int i, nb, stat;
685 struct sk_buff *skb;
686 unsigned int residual;
687 int last;
688 unsigned long flags;
689
690 spin_lock_irqsave(&bp->lock, flags);
691
692 if (++rxintcount < 10) {
693 XXDEBUG(("bmac_rxdma_intr\n"));
694 }
695
696 last = -1;
697 i = bp->rx_empty;
698
699 while (1) {
700 cp = &bp->rx_cmds[i];
701 stat = ld_le16(&cp->xfer_status);
702 residual = ld_le16(&cp->res_count);
703 if ((stat & ACTIVE) == 0)
704 break;
705 nb = RX_BUFLEN - residual - 2;
706 if (nb < (ETHERMINPACKET - ETHERCRC)) {
707 skb = NULL;
708 dev->stats.rx_length_errors++;
709 dev->stats.rx_errors++;
710 } else {
711 skb = bp->rx_bufs[i];
712 bp->rx_bufs[i] = NULL;
713 }
714 if (skb != NULL) {
715 nb -= ETHERCRC;
716 skb_put(skb, nb);
717 skb->protocol = eth_type_trans(skb, dev);
718 netif_rx(skb);
719 dev->last_rx = jiffies;
720 ++dev->stats.rx_packets;
721 dev->stats.rx_bytes += nb;
722 } else {
723 ++dev->stats.rx_dropped;
724 }
725 dev->last_rx = jiffies;
726 if ((skb = bp->rx_bufs[i]) == NULL) {
727 bp->rx_bufs[i] = skb = dev_alloc_skb(RX_BUFLEN+2);
728 if (skb != NULL)
729 skb_reserve(bp->rx_bufs[i], 2);
730 }
731 bmac_construct_rxbuff(skb, &bp->rx_cmds[i]);
732 st_le16(&cp->res_count, 0);
733 st_le16(&cp->xfer_status, 0);
734 last = i;
735 if (++i >= N_RX_RING) i = 0;
736 }
737
738 if (last != -1) {
739 bp->rx_fill = last;
740 bp->rx_empty = i;
741 }
742
743 dbdma_continue(rd);
744 spin_unlock_irqrestore(&bp->lock, flags);
745
746 if (rxintcount < 10) {
747 XXDEBUG(("bmac_rxdma_intr done\n"));
748 }
749 return IRQ_HANDLED;
750 }
751
752 static int txintcount;
753
754 static irqreturn_t bmac_txdma_intr(int irq, void *dev_id)
755 {
756 struct net_device *dev = (struct net_device *) dev_id;
757 struct bmac_data *bp = netdev_priv(dev);
758 volatile struct dbdma_cmd *cp;
759 int stat;
760 unsigned long flags;
761
762 spin_lock_irqsave(&bp->lock, flags);
763
764 if (txintcount++ < 10) {
765 XXDEBUG(("bmac_txdma_intr\n"));
766 }
767
768 /* del_timer(&bp->tx_timeout); */
769 /* bp->timeout_active = 0; */
770
771 while (1) {
772 cp = &bp->tx_cmds[bp->tx_empty];
773 stat = ld_le16(&cp->xfer_status);
774 if (txintcount < 10) {
775 XXDEBUG(("bmac_txdma_xfer_stat=%#0x\n", stat));
776 }
777 if (!(stat & ACTIVE)) {
778 /*
779 * status field might not have been filled by DBDMA
780 */
781 if (cp == bus_to_virt(in_le32(&bp->tx_dma->cmdptr)))
782 break;
783 }
784
785 if (bp->tx_bufs[bp->tx_empty]) {
786 ++dev->stats.tx_packets;
787 dev_kfree_skb_irq(bp->tx_bufs[bp->tx_empty]);
788 }
789 bp->tx_bufs[bp->tx_empty] = NULL;
790 bp->tx_fullup = 0;
791 netif_wake_queue(dev);
792 if (++bp->tx_empty >= N_TX_RING)
793 bp->tx_empty = 0;
794 if (bp->tx_empty == bp->tx_fill)
795 break;
796 }
797
798 spin_unlock_irqrestore(&bp->lock, flags);
799
800 if (txintcount < 10) {
801 XXDEBUG(("bmac_txdma_intr done->bmac_start\n"));
802 }
803
804 bmac_start(dev);
805 return IRQ_HANDLED;
806 }
807
808 #ifndef SUNHME_MULTICAST
809 /* Real fast bit-reversal algorithm, 6-bit values */
810 static int reverse6[64] = {
811 0x0,0x20,0x10,0x30,0x8,0x28,0x18,0x38,
812 0x4,0x24,0x14,0x34,0xc,0x2c,0x1c,0x3c,
813 0x2,0x22,0x12,0x32,0xa,0x2a,0x1a,0x3a,
814 0x6,0x26,0x16,0x36,0xe,0x2e,0x1e,0x3e,
815 0x1,0x21,0x11,0x31,0x9,0x29,0x19,0x39,
816 0x5,0x25,0x15,0x35,0xd,0x2d,0x1d,0x3d,
817 0x3,0x23,0x13,0x33,0xb,0x2b,0x1b,0x3b,
818 0x7,0x27,0x17,0x37,0xf,0x2f,0x1f,0x3f
819 };
820
821 static unsigned int
822 crc416(unsigned int curval, unsigned short nxtval)
823 {
824 register unsigned int counter, cur = curval, next = nxtval;
825 register int high_crc_set, low_data_set;
826
827 /* Swap bytes */
828 next = ((next & 0x00FF) << 8) | (next >> 8);
829
830 /* Compute bit-by-bit */
831 for (counter = 0; counter < 16; ++counter) {
832 /* is high CRC bit set? */
833 if ((cur & 0x80000000) == 0) high_crc_set = 0;
834 else high_crc_set = 1;
835
836 cur = cur << 1;
837
838 if ((next & 0x0001) == 0) low_data_set = 0;
839 else low_data_set = 1;
840
841 next = next >> 1;
842
843 /* do the XOR */
844 if (high_crc_set ^ low_data_set) cur = cur ^ ENET_CRCPOLY;
845 }
846 return cur;
847 }
848
849 static unsigned int
850 bmac_crc(unsigned short *address)
851 {
852 unsigned int newcrc;
853
854 XXDEBUG(("bmac_crc: addr=%#04x, %#04x, %#04x\n", *address, address[1], address[2]));
855 newcrc = crc416(0xffffffff, *address); /* address bits 47 - 32 */
856 newcrc = crc416(newcrc, address[1]); /* address bits 31 - 16 */
857 newcrc = crc416(newcrc, address[2]); /* address bits 15 - 0 */
858
859 return(newcrc);
860 }
861
862 /*
863 * Add requested mcast addr to BMac's hash table filter.
864 *
865 */
866
867 static void
868 bmac_addhash(struct bmac_data *bp, unsigned char *addr)
869 {
870 unsigned int crc;
871 unsigned short mask;
872
873 if (!(*addr)) return;
874 crc = bmac_crc((unsigned short *)addr) & 0x3f; /* Big-endian alert! */
875 crc = reverse6[crc]; /* Hyperfast bit-reversing algorithm */
876 if (bp->hash_use_count[crc]++) return; /* This bit is already set */
877 mask = crc % 16;
878 mask = (unsigned char)1 << mask;
879 bp->hash_use_count[crc/16] |= mask;
880 }
881
882 static void
883 bmac_removehash(struct bmac_data *bp, unsigned char *addr)
884 {
885 unsigned int crc;
886 unsigned char mask;
887
888 /* Now, delete the address from the filter copy, as indicated */
889 crc = bmac_crc((unsigned short *)addr) & 0x3f; /* Big-endian alert! */
890 crc = reverse6[crc]; /* Hyperfast bit-reversing algorithm */
891 if (bp->hash_use_count[crc] == 0) return; /* That bit wasn't in use! */
892 if (--bp->hash_use_count[crc]) return; /* That bit is still in use */
893 mask = crc % 16;
894 mask = ((unsigned char)1 << mask) ^ 0xffff; /* To turn off bit */
895 bp->hash_table_mask[crc/16] &= mask;
896 }
897
898 /*
899 * Sync the adapter with the software copy of the multicast mask
900 * (logical address filter).
901 */
902
903 static void
904 bmac_rx_off(struct net_device *dev)
905 {
906 unsigned short rx_cfg;
907
908 rx_cfg = bmread(dev, RXCFG);
909 rx_cfg &= ~RxMACEnable;
910 bmwrite(dev, RXCFG, rx_cfg);
911 do {
912 rx_cfg = bmread(dev, RXCFG);
913 } while (rx_cfg & RxMACEnable);
914 }
915
916 unsigned short
917 bmac_rx_on(struct net_device *dev, int hash_enable, int promisc_enable)
918 {
919 unsigned short rx_cfg;
920
921 rx_cfg = bmread(dev, RXCFG);
922 rx_cfg |= RxMACEnable;
923 if (hash_enable) rx_cfg |= RxHashFilterEnable;
924 else rx_cfg &= ~RxHashFilterEnable;
925 if (promisc_enable) rx_cfg |= RxPromiscEnable;
926 else rx_cfg &= ~RxPromiscEnable;
927 bmwrite(dev, RXRST, RxResetValue);
928 bmwrite(dev, RXFIFOCSR, 0); /* first disable rxFIFO */
929 bmwrite(dev, RXFIFOCSR, RxFIFOEnable );
930 bmwrite(dev, RXCFG, rx_cfg );
931 return rx_cfg;
932 }
933
934 static void
935 bmac_update_hash_table_mask(struct net_device *dev, struct bmac_data *bp)
936 {
937 bmwrite(dev, BHASH3, bp->hash_table_mask[0]); /* bits 15 - 0 */
938 bmwrite(dev, BHASH2, bp->hash_table_mask[1]); /* bits 31 - 16 */
939 bmwrite(dev, BHASH1, bp->hash_table_mask[2]); /* bits 47 - 32 */
940 bmwrite(dev, BHASH0, bp->hash_table_mask[3]); /* bits 63 - 48 */
941 }
942
943 #if 0
944 static void
945 bmac_add_multi(struct net_device *dev,
946 struct bmac_data *bp, unsigned char *addr)
947 {
948 /* XXDEBUG(("bmac: enter bmac_add_multi\n")); */
949 bmac_addhash(bp, addr);
950 bmac_rx_off(dev);
951 bmac_update_hash_table_mask(dev, bp);
952 bmac_rx_on(dev, 1, (dev->flags & IFF_PROMISC)? 1 : 0);
953 /* XXDEBUG(("bmac: exit bmac_add_multi\n")); */
954 }
955
956 static void
957 bmac_remove_multi(struct net_device *dev,
958 struct bmac_data *bp, unsigned char *addr)
959 {
960 bmac_removehash(bp, addr);
961 bmac_rx_off(dev);
962 bmac_update_hash_table_mask(dev, bp);
963 bmac_rx_on(dev, 1, (dev->flags & IFF_PROMISC)? 1 : 0);
964 }
965 #endif
966
967 /* Set or clear the multicast filter for this adaptor.
968 num_addrs == -1 Promiscuous mode, receive all packets
969 num_addrs == 0 Normal mode, clear multicast list
970 num_addrs > 0 Multicast mode, receive normal and MC packets, and do
971 best-effort filtering.
972 */
973 static void bmac_set_multicast(struct net_device *dev)
974 {
975 struct dev_mc_list *dmi;
976 struct bmac_data *bp = netdev_priv(dev);
977 int num_addrs = dev->mc_count;
978 unsigned short rx_cfg;
979 int i;
980
981 if (bp->sleeping)
982 return;
983
984 XXDEBUG(("bmac: enter bmac_set_multicast, n_addrs=%d\n", num_addrs));
985
986 if((dev->flags & IFF_ALLMULTI) || (dev->mc_count > 64)) {
987 for (i=0; i<4; i++) bp->hash_table_mask[i] = 0xffff;
988 bmac_update_hash_table_mask(dev, bp);
989 rx_cfg = bmac_rx_on(dev, 1, 0);
990 XXDEBUG(("bmac: all multi, rx_cfg=%#08x\n"));
991 } else if ((dev->flags & IFF_PROMISC) || (num_addrs < 0)) {
992 rx_cfg = bmread(dev, RXCFG);
993 rx_cfg |= RxPromiscEnable;
994 bmwrite(dev, RXCFG, rx_cfg);
995 rx_cfg = bmac_rx_on(dev, 0, 1);
996 XXDEBUG(("bmac: promisc mode enabled, rx_cfg=%#08x\n", rx_cfg));
997 } else {
998 for (i=0; i<4; i++) bp->hash_table_mask[i] = 0;
999 for (i=0; i<64; i++) bp->hash_use_count[i] = 0;
1000 if (num_addrs == 0) {
1001 rx_cfg = bmac_rx_on(dev, 0, 0);
1002 XXDEBUG(("bmac: multi disabled, rx_cfg=%#08x\n", rx_cfg));
1003 } else {
1004 for (dmi=dev->mc_list; dmi!=NULL; dmi=dmi->next)
1005 bmac_addhash(bp, dmi->dmi_addr);
1006 bmac_update_hash_table_mask(dev, bp);
1007 rx_cfg = bmac_rx_on(dev, 1, 0);
1008 XXDEBUG(("bmac: multi enabled, rx_cfg=%#08x\n", rx_cfg));
1009 }
1010 }
1011 /* XXDEBUG(("bmac: exit bmac_set_multicast\n")); */
1012 }
1013 #else /* ifdef SUNHME_MULTICAST */
1014
1015 /* The version of set_multicast below was lifted from sunhme.c */
1016
1017 static void bmac_set_multicast(struct net_device *dev)
1018 {
1019 struct dev_mc_list *dmi = dev->mc_list;
1020 char *addrs;
1021 int i;
1022 unsigned short rx_cfg;
1023 u32 crc;
1024
1025 if((dev->flags & IFF_ALLMULTI) || (dev->mc_count > 64)) {
1026 bmwrite(dev, BHASH0, 0xffff);
1027 bmwrite(dev, BHASH1, 0xffff);
1028 bmwrite(dev, BHASH2, 0xffff);
1029 bmwrite(dev, BHASH3, 0xffff);
1030 } else if(dev->flags & IFF_PROMISC) {
1031 rx_cfg = bmread(dev, RXCFG);
1032 rx_cfg |= RxPromiscEnable;
1033 bmwrite(dev, RXCFG, rx_cfg);
1034 } else {
1035 u16 hash_table[4];
1036
1037 rx_cfg = bmread(dev, RXCFG);
1038 rx_cfg &= ~RxPromiscEnable;
1039 bmwrite(dev, RXCFG, rx_cfg);
1040
1041 for(i = 0; i < 4; i++) hash_table[i] = 0;
1042
1043 for(i = 0; i < dev->mc_count; i++) {
1044 addrs = dmi->dmi_addr;
1045 dmi = dmi->next;
1046
1047 if(!(*addrs & 1))
1048 continue;
1049
1050 crc = ether_crc_le(6, addrs);
1051 crc >>= 26;
1052 hash_table[crc >> 4] |= 1 << (crc & 0xf);
1053 }
1054 bmwrite(dev, BHASH0, hash_table[0]);
1055 bmwrite(dev, BHASH1, hash_table[1]);
1056 bmwrite(dev, BHASH2, hash_table[2]);
1057 bmwrite(dev, BHASH3, hash_table[3]);
1058 }
1059 }
1060 #endif /* SUNHME_MULTICAST */
1061
1062 static int miscintcount;
1063
1064 static irqreturn_t bmac_misc_intr(int irq, void *dev_id)
1065 {
1066 struct net_device *dev = (struct net_device *) dev_id;
1067 struct bmac_data *bp = netdev_priv(dev);
1068 unsigned int status = bmread(dev, STATUS);
1069 if (miscintcount++ < 10) {
1070 XXDEBUG(("bmac_misc_intr\n"));
1071 }
1072 /* XXDEBUG(("bmac_misc_intr, status=%#08x\n", status)); */
1073 /* bmac_txdma_intr_inner(irq, dev_id); */
1074 /* if (status & FrameReceived) dev->stats.rx_dropped++; */
1075 if (status & RxErrorMask) dev->stats.rx_errors++;
1076 if (status & RxCRCCntExp) dev->stats.rx_crc_errors++;
1077 if (status & RxLenCntExp) dev->stats.rx_length_errors++;
1078 if (status & RxOverFlow) dev->stats.rx_over_errors++;
1079 if (status & RxAlignCntExp) dev->stats.rx_frame_errors++;
1080
1081 /* if (status & FrameSent) dev->stats.tx_dropped++; */
1082 if (status & TxErrorMask) dev->stats.tx_errors++;
1083 if (status & TxUnderrun) dev->stats.tx_fifo_errors++;
1084 if (status & TxNormalCollExp) dev->stats.collisions++;
1085 return IRQ_HANDLED;
1086 }
1087
1088 /*
1089 * Procedure for reading EEPROM
1090 */
1091 #define SROMAddressLength 5
1092 #define DataInOn 0x0008
1093 #define DataInOff 0x0000
1094 #define Clk 0x0002
1095 #define ChipSelect 0x0001
1096 #define SDIShiftCount 3
1097 #define SD0ShiftCount 2
1098 #define DelayValue 1000 /* number of microseconds */
1099 #define SROMStartOffset 10 /* this is in words */
1100 #define SROMReadCount 3 /* number of words to read from SROM */
1101 #define SROMAddressBits 6
1102 #define EnetAddressOffset 20
1103
1104 static unsigned char
1105 bmac_clock_out_bit(struct net_device *dev)
1106 {
1107 unsigned short data;
1108 unsigned short val;
1109
1110 bmwrite(dev, SROMCSR, ChipSelect | Clk);
1111 udelay(DelayValue);
1112
1113 data = bmread(dev, SROMCSR);
1114 udelay(DelayValue);
1115 val = (data >> SD0ShiftCount) & 1;
1116
1117 bmwrite(dev, SROMCSR, ChipSelect);
1118 udelay(DelayValue);
1119
1120 return val;
1121 }
1122
1123 static void
1124 bmac_clock_in_bit(struct net_device *dev, unsigned int val)
1125 {
1126 unsigned short data;
1127
1128 if (val != 0 && val != 1) return;
1129
1130 data = (val << SDIShiftCount);
1131 bmwrite(dev, SROMCSR, data | ChipSelect );
1132 udelay(DelayValue);
1133
1134 bmwrite(dev, SROMCSR, data | ChipSelect | Clk );
1135 udelay(DelayValue);
1136
1137 bmwrite(dev, SROMCSR, data | ChipSelect);
1138 udelay(DelayValue);
1139 }
1140
1141 static void
1142 reset_and_select_srom(struct net_device *dev)
1143 {
1144 /* first reset */
1145 bmwrite(dev, SROMCSR, 0);
1146 udelay(DelayValue);
1147
1148 /* send it the read command (110) */
1149 bmac_clock_in_bit(dev, 1);
1150 bmac_clock_in_bit(dev, 1);
1151 bmac_clock_in_bit(dev, 0);
1152 }
1153
1154 static unsigned short
1155 read_srom(struct net_device *dev, unsigned int addr, unsigned int addr_len)
1156 {
1157 unsigned short data, val;
1158 int i;
1159
1160 /* send out the address we want to read from */
1161 for (i = 0; i < addr_len; i++) {
1162 val = addr >> (addr_len-i-1);
1163 bmac_clock_in_bit(dev, val & 1);
1164 }
1165
1166 /* Now read in the 16-bit data */
1167 data = 0;
1168 for (i = 0; i < 16; i++) {
1169 val = bmac_clock_out_bit(dev);
1170 data <<= 1;
1171 data |= val;
1172 }
1173 bmwrite(dev, SROMCSR, 0);
1174
1175 return data;
1176 }
1177
1178 /*
1179 * It looks like Cogent and SMC use different methods for calculating
1180 * checksums. What a pain..
1181 */
1182
1183 static int
1184 bmac_verify_checksum(struct net_device *dev)
1185 {
1186 unsigned short data, storedCS;
1187
1188 reset_and_select_srom(dev);
1189 data = read_srom(dev, 3, SROMAddressBits);
1190 storedCS = ((data >> 8) & 0x0ff) | ((data << 8) & 0xff00);
1191
1192 return 0;
1193 }
1194
1195
1196 static void
1197 bmac_get_station_address(struct net_device *dev, unsigned char *ea)
1198 {
1199 int i;
1200 unsigned short data;
1201
1202 for (i = 0; i < 6; i++)
1203 {
1204 reset_and_select_srom(dev);
1205 data = read_srom(dev, i + EnetAddressOffset/2, SROMAddressBits);
1206 ea[2*i] = bitrev8(data & 0x0ff);
1207 ea[2*i+1] = bitrev8((data >> 8) & 0x0ff);
1208 }
1209 }
1210
1211 static void bmac_reset_and_enable(struct net_device *dev)
1212 {
1213 struct bmac_data *bp = netdev_priv(dev);
1214 unsigned long flags;
1215 struct sk_buff *skb;
1216 unsigned char *data;
1217
1218 spin_lock_irqsave(&bp->lock, flags);
1219 bmac_enable_and_reset_chip(dev);
1220 bmac_init_tx_ring(bp);
1221 bmac_init_rx_ring(bp);
1222 bmac_init_chip(dev);
1223 bmac_start_chip(dev);
1224 bmwrite(dev, INTDISABLE, EnableNormal);
1225 bp->sleeping = 0;
1226
1227 /*
1228 * It seems that the bmac can't receive until it's transmitted
1229 * a packet. So we give it a dummy packet to transmit.
1230 */
1231 skb = dev_alloc_skb(ETHERMINPACKET);
1232 if (skb != NULL) {
1233 data = skb_put(skb, ETHERMINPACKET);
1234 memset(data, 0, ETHERMINPACKET);
1235 memcpy(data, dev->dev_addr, 6);
1236 memcpy(data+6, dev->dev_addr, 6);
1237 bmac_transmit_packet(skb, dev);
1238 }
1239 spin_unlock_irqrestore(&bp->lock, flags);
1240 }
1241 static void bmac_get_drvinfo(struct net_device *dev, struct ethtool_drvinfo *info)
1242 {
1243 struct bmac_data *bp = netdev_priv(dev);
1244 strcpy(info->driver, "bmac");
1245 strcpy(info->bus_info, bp->mdev->ofdev.dev.bus_id);
1246 }
1247
1248 static const struct ethtool_ops bmac_ethtool_ops = {
1249 .get_drvinfo = bmac_get_drvinfo,
1250 .get_link = ethtool_op_get_link,
1251 };
1252
1253 static int __devinit bmac_probe(struct macio_dev *mdev, const struct of_device_id *match)
1254 {
1255 int j, rev, ret;
1256 struct bmac_data *bp;
1257 const unsigned char *prop_addr;
1258 unsigned char addr[6];
1259 struct net_device *dev;
1260 int is_bmac_plus = ((int)match->data) != 0;
1261 DECLARE_MAC_BUF(mac);
1262
1263 if (macio_resource_count(mdev) != 3 || macio_irq_count(mdev) != 3) {
1264 printk(KERN_ERR "BMAC: can't use, need 3 addrs and 3 intrs\n");
1265 return -ENODEV;
1266 }
1267 prop_addr = of_get_property(macio_get_of_node(mdev),
1268 "mac-address", NULL);
1269 if (prop_addr == NULL) {
1270 prop_addr = of_get_property(macio_get_of_node(mdev),
1271 "local-mac-address", NULL);
1272 if (prop_addr == NULL) {
1273 printk(KERN_ERR "BMAC: Can't get mac-address\n");
1274 return -ENODEV;
1275 }
1276 }
1277 memcpy(addr, prop_addr, sizeof(addr));
1278
1279 dev = alloc_etherdev(PRIV_BYTES);
1280 if (!dev) {
1281 printk(KERN_ERR "BMAC: alloc_etherdev failed, out of memory\n");
1282 return -ENOMEM;
1283 }
1284
1285 bp = netdev_priv(dev);
1286 SET_NETDEV_DEV(dev, &mdev->ofdev.dev);
1287 macio_set_drvdata(mdev, dev);
1288
1289 bp->mdev = mdev;
1290 spin_lock_init(&bp->lock);
1291
1292 if (macio_request_resources(mdev, "bmac")) {
1293 printk(KERN_ERR "BMAC: can't request IO resource !\n");
1294 goto out_free;
1295 }
1296
1297 dev->base_addr = (unsigned long)
1298 ioremap(macio_resource_start(mdev, 0), macio_resource_len(mdev, 0));
1299 if (dev->base_addr == 0)
1300 goto out_release;
1301
1302 dev->irq = macio_irq(mdev, 0);
1303
1304 bmac_enable_and_reset_chip(dev);
1305 bmwrite(dev, INTDISABLE, DisableAll);
1306
1307 rev = addr[0] == 0 && addr[1] == 0xA0;
1308 for (j = 0; j < 6; ++j)
1309 dev->dev_addr[j] = rev ? bitrev8(addr[j]): addr[j];
1310
1311 /* Enable chip without interrupts for now */
1312 bmac_enable_and_reset_chip(dev);
1313 bmwrite(dev, INTDISABLE, DisableAll);
1314
1315 dev->open = bmac_open;
1316 dev->stop = bmac_close;
1317 dev->ethtool_ops = &bmac_ethtool_ops;
1318 dev->hard_start_xmit = bmac_output;
1319 dev->set_multicast_list = bmac_set_multicast;
1320 dev->set_mac_address = bmac_set_address;
1321
1322 bmac_get_station_address(dev, addr);
1323 if (bmac_verify_checksum(dev) != 0)
1324 goto err_out_iounmap;
1325
1326 bp->is_bmac_plus = is_bmac_plus;
1327 bp->tx_dma = ioremap(macio_resource_start(mdev, 1), macio_resource_len(mdev, 1));
1328 if (!bp->tx_dma)
1329 goto err_out_iounmap;
1330 bp->tx_dma_intr = macio_irq(mdev, 1);
1331 bp->rx_dma = ioremap(macio_resource_start(mdev, 2), macio_resource_len(mdev, 2));
1332 if (!bp->rx_dma)
1333 goto err_out_iounmap_tx;
1334 bp->rx_dma_intr = macio_irq(mdev, 2);
1335
1336 bp->tx_cmds = (volatile struct dbdma_cmd *) DBDMA_ALIGN(bp + 1);
1337 bp->rx_cmds = bp->tx_cmds + N_TX_RING + 1;
1338
1339 bp->queue = (struct sk_buff_head *)(bp->rx_cmds + N_RX_RING + 1);
1340 skb_queue_head_init(bp->queue);
1341
1342 init_timer(&bp->tx_timeout);
1343
1344 ret = request_irq(dev->irq, bmac_misc_intr, 0, "BMAC-misc", dev);
1345 if (ret) {
1346 printk(KERN_ERR "BMAC: can't get irq %d\n", dev->irq);
1347 goto err_out_iounmap_rx;
1348 }
1349 ret = request_irq(bp->tx_dma_intr, bmac_txdma_intr, 0, "BMAC-txdma", dev);
1350 if (ret) {
1351 printk(KERN_ERR "BMAC: can't get irq %d\n", bp->tx_dma_intr);
1352 goto err_out_irq0;
1353 }
1354 ret = request_irq(bp->rx_dma_intr, bmac_rxdma_intr, 0, "BMAC-rxdma", dev);
1355 if (ret) {
1356 printk(KERN_ERR "BMAC: can't get irq %d\n", bp->rx_dma_intr);
1357 goto err_out_irq1;
1358 }
1359
1360 /* Mask chip interrupts and disable chip, will be
1361 * re-enabled on open()
1362 */
1363 disable_irq(dev->irq);
1364 pmac_call_feature(PMAC_FTR_BMAC_ENABLE, macio_get_of_node(bp->mdev), 0, 0);
1365
1366 if (register_netdev(dev) != 0) {
1367 printk(KERN_ERR "BMAC: Ethernet registration failed\n");
1368 goto err_out_irq2;
1369 }
1370
1371 printk(KERN_INFO "%s: BMAC%s at %s",
1372 dev->name, (is_bmac_plus ? "+" : ""), print_mac(mac, dev->dev_addr));
1373 XXDEBUG((", base_addr=%#0lx", dev->base_addr));
1374 printk("\n");
1375
1376 return 0;
1377
1378 err_out_irq2:
1379 free_irq(bp->rx_dma_intr, dev);
1380 err_out_irq1:
1381 free_irq(bp->tx_dma_intr, dev);
1382 err_out_irq0:
1383 free_irq(dev->irq, dev);
1384 err_out_iounmap_rx:
1385 iounmap(bp->rx_dma);
1386 err_out_iounmap_tx:
1387 iounmap(bp->tx_dma);
1388 err_out_iounmap:
1389 iounmap((void __iomem *)dev->base_addr);
1390 out_release:
1391 macio_release_resources(mdev);
1392 out_free:
1393 pmac_call_feature(PMAC_FTR_BMAC_ENABLE, macio_get_of_node(bp->mdev), 0, 0);
1394 free_netdev(dev);
1395
1396 return -ENODEV;
1397 }
1398
1399 static int bmac_open(struct net_device *dev)
1400 {
1401 struct bmac_data *bp = netdev_priv(dev);
1402 /* XXDEBUG(("bmac: enter open\n")); */
1403 /* reset the chip */
1404 bp->opened = 1;
1405 bmac_reset_and_enable(dev);
1406 enable_irq(dev->irq);
1407 return 0;
1408 }
1409
1410 static int bmac_close(struct net_device *dev)
1411 {
1412 struct bmac_data *bp = netdev_priv(dev);
1413 volatile struct dbdma_regs __iomem *rd = bp->rx_dma;
1414 volatile struct dbdma_regs __iomem *td = bp->tx_dma;
1415 unsigned short config;
1416 int i;
1417
1418 bp->sleeping = 1;
1419
1420 /* disable rx and tx */
1421 config = bmread(dev, RXCFG);
1422 bmwrite(dev, RXCFG, (config & ~RxMACEnable));
1423
1424 config = bmread(dev, TXCFG);
1425 bmwrite(dev, TXCFG, (config & ~TxMACEnable));
1426
1427 bmwrite(dev, INTDISABLE, DisableAll); /* disable all intrs */
1428
1429 /* disable rx and tx dma */
1430 st_le32(&rd->control, DBDMA_CLEAR(RUN|PAUSE|FLUSH|WAKE)); /* clear run bit */
1431 st_le32(&td->control, DBDMA_CLEAR(RUN|PAUSE|FLUSH|WAKE)); /* clear run bit */
1432
1433 /* free some skb's */
1434 XXDEBUG(("bmac: free rx bufs\n"));
1435 for (i=0; i<N_RX_RING; i++) {
1436 if (bp->rx_bufs[i] != NULL) {
1437 dev_kfree_skb(bp->rx_bufs[i]);
1438 bp->rx_bufs[i] = NULL;
1439 }
1440 }
1441 XXDEBUG(("bmac: free tx bufs\n"));
1442 for (i = 0; i<N_TX_RING; i++) {
1443 if (bp->tx_bufs[i] != NULL) {
1444 dev_kfree_skb(bp->tx_bufs[i]);
1445 bp->tx_bufs[i] = NULL;
1446 }
1447 }
1448 XXDEBUG(("bmac: all bufs freed\n"));
1449
1450 bp->opened = 0;
1451 disable_irq(dev->irq);
1452 pmac_call_feature(PMAC_FTR_BMAC_ENABLE, macio_get_of_node(bp->mdev), 0, 0);
1453
1454 return 0;
1455 }
1456
1457 static void
1458 bmac_start(struct net_device *dev)
1459 {
1460 struct bmac_data *bp = netdev_priv(dev);
1461 int i;
1462 struct sk_buff *skb;
1463 unsigned long flags;
1464
1465 if (bp->sleeping)
1466 return;
1467
1468 spin_lock_irqsave(&bp->lock, flags);
1469 while (1) {
1470 i = bp->tx_fill + 1;
1471 if (i >= N_TX_RING)
1472 i = 0;
1473 if (i == bp->tx_empty)
1474 break;
1475 skb = skb_dequeue(bp->queue);
1476 if (skb == NULL)
1477 break;
1478 bmac_transmit_packet(skb, dev);
1479 }
1480 spin_unlock_irqrestore(&bp->lock, flags);
1481 }
1482
1483 static int
1484 bmac_output(struct sk_buff *skb, struct net_device *dev)
1485 {
1486 struct bmac_data *bp = netdev_priv(dev);
1487 skb_queue_tail(bp->queue, skb);
1488 bmac_start(dev);
1489 return 0;
1490 }
1491
1492 static void bmac_tx_timeout(unsigned long data)
1493 {
1494 struct net_device *dev = (struct net_device *) data;
1495 struct bmac_data *bp = netdev_priv(dev);
1496 volatile struct dbdma_regs __iomem *td = bp->tx_dma;
1497 volatile struct dbdma_regs __iomem *rd = bp->rx_dma;
1498 volatile struct dbdma_cmd *cp;
1499 unsigned long flags;
1500 unsigned short config, oldConfig;
1501 int i;
1502
1503 XXDEBUG(("bmac: tx_timeout called\n"));
1504 spin_lock_irqsave(&bp->lock, flags);
1505 bp->timeout_active = 0;
1506
1507 /* update various counters */
1508 /* bmac_handle_misc_intrs(bp, 0); */
1509
1510 cp = &bp->tx_cmds[bp->tx_empty];
1511 /* XXDEBUG((KERN_DEBUG "bmac: tx dmastat=%x %x runt=%d pr=%x fs=%x fc=%x\n", */
1512 /* ld_le32(&td->status), ld_le16(&cp->xfer_status), bp->tx_bad_runt, */
1513 /* mb->pr, mb->xmtfs, mb->fifofc)); */
1514
1515 /* turn off both tx and rx and reset the chip */
1516 config = bmread(dev, RXCFG);
1517 bmwrite(dev, RXCFG, (config & ~RxMACEnable));
1518 config = bmread(dev, TXCFG);
1519 bmwrite(dev, TXCFG, (config & ~TxMACEnable));
1520 out_le32(&td->control, DBDMA_CLEAR(RUN|PAUSE|FLUSH|WAKE|ACTIVE|DEAD));
1521 printk(KERN_ERR "bmac: transmit timeout - resetting\n");
1522 bmac_enable_and_reset_chip(dev);
1523
1524 /* restart rx dma */
1525 cp = bus_to_virt(ld_le32(&rd->cmdptr));
1526 out_le32(&rd->control, DBDMA_CLEAR(RUN|PAUSE|FLUSH|WAKE|ACTIVE|DEAD));
1527 out_le16(&cp->xfer_status, 0);
1528 out_le32(&rd->cmdptr, virt_to_bus(cp));
1529 out_le32(&rd->control, DBDMA_SET(RUN|WAKE));
1530
1531 /* fix up the transmit side */
1532 XXDEBUG((KERN_DEBUG "bmac: tx empty=%d fill=%d fullup=%d\n",
1533 bp->tx_empty, bp->tx_fill, bp->tx_fullup));
1534 i = bp->tx_empty;
1535 ++dev->stats.tx_errors;
1536 if (i != bp->tx_fill) {
1537 dev_kfree_skb(bp->tx_bufs[i]);
1538 bp->tx_bufs[i] = NULL;
1539 if (++i >= N_TX_RING) i = 0;
1540 bp->tx_empty = i;
1541 }
1542 bp->tx_fullup = 0;
1543 netif_wake_queue(dev);
1544 if (i != bp->tx_fill) {
1545 cp = &bp->tx_cmds[i];
1546 out_le16(&cp->xfer_status, 0);
1547 out_le16(&cp->command, OUTPUT_LAST);
1548 out_le32(&td->cmdptr, virt_to_bus(cp));
1549 out_le32(&td->control, DBDMA_SET(RUN));
1550 /* bmac_set_timeout(dev); */
1551 XXDEBUG((KERN_DEBUG "bmac: starting %d\n", i));
1552 }
1553
1554 /* turn it back on */
1555 oldConfig = bmread(dev, RXCFG);
1556 bmwrite(dev, RXCFG, oldConfig | RxMACEnable );
1557 oldConfig = bmread(dev, TXCFG);
1558 bmwrite(dev, TXCFG, oldConfig | TxMACEnable );
1559
1560 spin_unlock_irqrestore(&bp->lock, flags);
1561 }
1562
1563 #if 0
1564 static void dump_dbdma(volatile struct dbdma_cmd *cp,int count)
1565 {
1566 int i,*ip;
1567
1568 for (i=0;i< count;i++) {
1569 ip = (int*)(cp+i);
1570
1571 printk("dbdma req 0x%x addr 0x%x baddr 0x%x xfer/res 0x%x\n",
1572 ld_le32(ip+0),
1573 ld_le32(ip+1),
1574 ld_le32(ip+2),
1575 ld_le32(ip+3));
1576 }
1577
1578 }
1579 #endif
1580
1581 #if 0
1582 static int
1583 bmac_proc_info(char *buffer, char **start, off_t offset, int length)
1584 {
1585 int len = 0;
1586 off_t pos = 0;
1587 off_t begin = 0;
1588 int i;
1589
1590 if (bmac_devs == NULL)
1591 return (-ENOSYS);
1592
1593 len += sprintf(buffer, "BMAC counters & registers\n");
1594
1595 for (i = 0; i<N_REG_ENTRIES; i++) {
1596 len += sprintf(buffer + len, "%s: %#08x\n",
1597 reg_entries[i].name,
1598 bmread(bmac_devs, reg_entries[i].reg_offset));
1599 pos = begin + len;
1600
1601 if (pos < offset) {
1602 len = 0;
1603 begin = pos;
1604 }
1605
1606 if (pos > offset+length) break;
1607 }
1608
1609 *start = buffer + (offset - begin);
1610 len -= (offset - begin);
1611
1612 if (len > length) len = length;
1613
1614 return len;
1615 }
1616 #endif
1617
1618 static int __devexit bmac_remove(struct macio_dev *mdev)
1619 {
1620 struct net_device *dev = macio_get_drvdata(mdev);
1621 struct bmac_data *bp = netdev_priv(dev);
1622
1623 unregister_netdev(dev);
1624
1625 free_irq(dev->irq, dev);
1626 free_irq(bp->tx_dma_intr, dev);
1627 free_irq(bp->rx_dma_intr, dev);
1628
1629 iounmap((void __iomem *)dev->base_addr);
1630 iounmap(bp->tx_dma);
1631 iounmap(bp->rx_dma);
1632
1633 macio_release_resources(mdev);
1634
1635 free_netdev(dev);
1636
1637 return 0;
1638 }
1639
1640 static struct of_device_id bmac_match[] =
1641 {
1642 {
1643 .name = "bmac",
1644 .data = (void *)0,
1645 },
1646 {
1647 .type = "network",
1648 .compatible = "bmac+",
1649 .data = (void *)1,
1650 },
1651 {},
1652 };
1653 MODULE_DEVICE_TABLE (of, bmac_match);
1654
1655 static struct macio_driver bmac_driver =
1656 {
1657 .name = "bmac",
1658 .match_table = bmac_match,
1659 .probe = bmac_probe,
1660 .remove = bmac_remove,
1661 #ifdef CONFIG_PM
1662 .suspend = bmac_suspend,
1663 .resume = bmac_resume,
1664 #endif
1665 };
1666
1667
1668 static int __init bmac_init(void)
1669 {
1670 if (bmac_emergency_rxbuf == NULL) {
1671 bmac_emergency_rxbuf = kmalloc(RX_BUFLEN, GFP_KERNEL);
1672 if (bmac_emergency_rxbuf == NULL) {
1673 printk(KERN_ERR "BMAC: can't allocate emergency RX buffer\n");
1674 return -ENOMEM;
1675 }
1676 }
1677
1678 return macio_register_driver(&bmac_driver);
1679 }
1680
1681 static void __exit bmac_exit(void)
1682 {
1683 macio_unregister_driver(&bmac_driver);
1684
1685 kfree(bmac_emergency_rxbuf);
1686 bmac_emergency_rxbuf = NULL;
1687 }
1688
1689 MODULE_AUTHOR("Randy Gobbel/Paul Mackerras");
1690 MODULE_DESCRIPTION("PowerMac BMAC ethernet driver.");
1691 MODULE_LICENSE("GPL");
1692
1693 module_init(bmac_init);
1694 module_exit(bmac_exit);
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