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kbuild: document howto build external modules using several directories
[linux-2.6/verdex.git] / drivers / net / meth.c
blobe23655f5049fa340ba432fc3ecb4fb90b1bd3d1e
1 /*
2 * meth.c -- O2 Builtin 10/100 Ethernet driver
3 *
4 * Copyright (C) 2001-2003 Ilya Volynets
5 *
6 * This program is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU General Public License
8 * as published by the Free Software Foundation; either version
9 * 2 of the License, or (at your option) any later version.
10 */
11 #include <linux/module.h>
12 #include <linux/init.h>
13
14 #include <linux/sched.h>
15 #include <linux/kernel.h> /* printk() */
16 #include <linux/delay.h>
17 #include <linux/slab.h>
18 #include <linux/errno.h> /* error codes */
19 #include <linux/types.h> /* size_t */
20 #include <linux/interrupt.h> /* mark_bh */
21
22 #include <linux/in.h>
23 #include <linux/in6.h>
24 #include <linux/device.h> /* struct device, et al */
25 #include <linux/netdevice.h> /* struct device, and other headers */
26 #include <linux/etherdevice.h> /* eth_type_trans */
27 #include <linux/ip.h> /* struct iphdr */
28 #include <linux/tcp.h> /* struct tcphdr */
29 #include <linux/skbuff.h>
30 #include <linux/mii.h> /* MII definitions */
31
32 #include <asm/ip32/mace.h>
33 #include <asm/ip32/ip32_ints.h>
34
35 #include <asm/io.h>
36 #include <asm/checksum.h>
37 #include <asm/scatterlist.h>
38 #include <linux/dma-mapping.h>
39
40 #include "meth.h"
41
42 #ifndef MFE_DEBUG
43 #define MFE_DEBUG 0
44 #endif
45
46 #if MFE_DEBUG>=1
47 #define DPRINTK(str,args...) printk(KERN_DEBUG "meth: %s: " str, __FUNCTION__ , ## args)
48 #define MFE_RX_DEBUG 2
49 #else
50 #define DPRINTK(str,args...)
51 #define MFE_RX_DEBUG 0
52 #endif
53
54
55 static const char *meth_str="SGI O2 Fast Ethernet";
56 MODULE_AUTHOR("Ilya Volynets <ilya@theIlya.com>");
57 MODULE_DESCRIPTION("SGI O2 Builtin Fast Ethernet driver");
58
59 #define HAVE_TX_TIMEOUT
60 /* The maximum time waited (in jiffies) before assuming a Tx failed. (400ms) */
61 #define TX_TIMEOUT (400*HZ/1000)
62
63 #ifdef HAVE_TX_TIMEOUT
64 static int timeout = TX_TIMEOUT;
65 MODULE_PARM(timeout, "i");
66 #endif
67
68 /*
69 * This structure is private to each device. It is used to pass
70 * packets in and out, so there is place for a packet
71 */
72 struct meth_private {
73 struct net_device_stats stats;
74 /* in-memory copy of MAC Control register */
75 unsigned long mac_ctrl;
76 /* in-memory copy of DMA Control register */
77 unsigned long dma_ctrl;
78 /* address of PHY, used by mdio_* functions, initialized in mdio_probe */
79 unsigned long phy_addr;
80 tx_packet *tx_ring;
81 dma_addr_t tx_ring_dma;
82 struct sk_buff *tx_skbs[TX_RING_ENTRIES];
83 dma_addr_t tx_skb_dmas[TX_RING_ENTRIES];
84 unsigned long tx_read, tx_write, tx_count;
85
86 rx_packet *rx_ring[RX_RING_ENTRIES];
87 dma_addr_t rx_ring_dmas[RX_RING_ENTRIES];
88 struct sk_buff *rx_skbs[RX_RING_ENTRIES];
89 unsigned long rx_write;
90
91 spinlock_t meth_lock;
92 };
93
94 static void meth_tx_timeout(struct net_device *dev);
95 static irqreturn_t meth_interrupt(int irq, void *dev_id, struct pt_regs *pregs);
96
97 /* global, initialized in ip32-setup.c */
98 char o2meth_eaddr[8]={0,0,0,0,0,0,0,0};
99
100 static inline void load_eaddr(struct net_device *dev)
101 {
102 int i;
103 DPRINTK("Loading MAC Address: %02x:%02x:%02x:%02x:%02x:%02x\n",
104 (int)o2meth_eaddr[0]&0xFF,(int)o2meth_eaddr[1]&0xFF,(int)o2meth_eaddr[2]&0xFF,
105 (int)o2meth_eaddr[3]&0xFF,(int)o2meth_eaddr[4]&0xFF,(int)o2meth_eaddr[5]&0xFF);
106 for (i = 0; i < 6; i++)
107 dev->dev_addr[i] = o2meth_eaddr[i];
108 mace->eth.mac_addr = (*(unsigned long*)o2meth_eaddr) >> 16;
109 }
110
111 /*
112 * Waits for BUSY status of mdio bus to clear
113 */
114 #define WAIT_FOR_PHY(___rval) \
115 while ((___rval = mace->eth.phy_data) & MDIO_BUSY) { \
116 udelay(25); \
117 }
118 /*read phy register, return value read */
119 static unsigned long mdio_read(struct meth_private *priv, unsigned long phyreg)
120 {
121 unsigned long rval;
122 WAIT_FOR_PHY(rval);
123 mace->eth.phy_regs = (priv->phy_addr << 5) | (phyreg & 0x1f);
124 udelay(25);
125 mace->eth.phy_trans_go = 1;
126 udelay(25);
127 WAIT_FOR_PHY(rval);
128 return rval & MDIO_DATA_MASK;
129 }
130
131 static int mdio_probe(struct meth_private *priv)
132 {
133 int i;
134 unsigned long p2, p3;
135 /* check if phy is detected already */
136 if(priv->phy_addr>=0&&priv->phy_addr<32)
137 return 0;
138 spin_lock(&priv->meth_lock);
139 for (i=0;i<32;++i){
140 priv->phy_addr=i;
141 p2=mdio_read(priv,2);
142 p3=mdio_read(priv,3);
143 #if MFE_DEBUG>=2
144 switch ((p2<<12)|(p3>>4)){
145 case PHY_QS6612X:
146 DPRINTK("PHY is QS6612X\n");
147 break;
148 case PHY_ICS1889:
149 DPRINTK("PHY is ICS1889\n");
150 break;
151 case PHY_ICS1890:
152 DPRINTK("PHY is ICS1890\n");
153 break;
154 case PHY_DP83840:
155 DPRINTK("PHY is DP83840\n");
156 break;
157 }
158 #endif
159 if(p2!=0xffff&&p2!=0x0000){
160 DPRINTK("PHY code: %x\n",(p2<<12)|(p3>>4));
161 break;
162 }
163 }
164 spin_unlock(&priv->meth_lock);
165 if(priv->phy_addr<32) {
166 return 0;
167 }
168 DPRINTK("Oopsie! PHY is not known!\n");
169 priv->phy_addr=-1;
170 return -ENODEV;
171 }
172
173 static void meth_check_link(struct net_device *dev)
174 {
175 struct meth_private *priv = (struct meth_private *) dev->priv;
176 unsigned long mii_advertising = mdio_read(priv, 4);
177 unsigned long mii_partner = mdio_read(priv, 5);
178 unsigned long negotiated = mii_advertising & mii_partner;
179 unsigned long duplex, speed;
180
181 if (mii_partner == 0xffff)
182 return;
183
184 speed = (negotiated & 0x0380) ? METH_100MBIT : 0;
185 duplex = ((negotiated & 0x0100) || (negotiated & 0x01C0) == 0x0040) ?
186 METH_PHY_FDX : 0;
187
188 if ((priv->mac_ctrl & METH_PHY_FDX) ^ duplex) {
189 DPRINTK("Setting %s-duplex\n", duplex ? "full" : "half");
190 if (duplex)
191 priv->mac_ctrl |= METH_PHY_FDX;
192 else
193 priv->mac_ctrl &= ~METH_PHY_FDX;
194 mace->eth.mac_ctrl = priv->mac_ctrl;
195 }
196
197 if ((priv->mac_ctrl & METH_100MBIT) ^ speed) {
198 DPRINTK("Setting %dMbs mode\n", speed ? 100 : 10);
199 if (duplex)
200 priv->mac_ctrl |= METH_100MBIT;
201 else
202 priv->mac_ctrl &= ~METH_100MBIT;
203 mace->eth.mac_ctrl = priv->mac_ctrl;
204 }
205 }
206
207
208 static int meth_init_tx_ring(struct meth_private *priv)
209 {
210 /* Init TX ring */
211 priv->tx_ring = dma_alloc_coherent(NULL, TX_RING_BUFFER_SIZE,
212 &priv->tx_ring_dma, GFP_ATOMIC);
213 if (!priv->tx_ring)
214 return -ENOMEM;
215 memset(priv->tx_ring, 0, TX_RING_BUFFER_SIZE);
216 priv->tx_count = priv->tx_read = priv->tx_write = 0;
217 mace->eth.tx_ring_base = priv->tx_ring_dma;
218 /* Now init skb save area */
219 memset(priv->tx_skbs, 0, sizeof(priv->tx_skbs));
220 memset(priv->tx_skb_dmas, 0, sizeof(priv->tx_skb_dmas));
221 return 0;
222 }
223
224 static int meth_init_rx_ring(struct meth_private *priv)
225 {
226 int i;
227
228 for (i = 0; i < RX_RING_ENTRIES; i++) {
229 priv->rx_skbs[i] = alloc_skb(METH_RX_BUFF_SIZE, 0);
230 /* 8byte status vector + 3quad padding + 2byte padding,
231 * to put data on 64bit aligned boundary */
232 skb_reserve(priv->rx_skbs[i],METH_RX_HEAD);
233 priv->rx_ring[i]=(rx_packet*)(priv->rx_skbs[i]->head);
234 /* I'll need to re-sync it after each RX */
235 priv->rx_ring_dmas[i] =
236 dma_map_single(NULL, priv->rx_ring[i],
237 METH_RX_BUFF_SIZE, DMA_FROM_DEVICE);
238 mace->eth.rx_fifo = priv->rx_ring_dmas[i];
239 }
240 priv->rx_write = 0;
241 return 0;
242 }
243 static void meth_free_tx_ring(struct meth_private *priv)
244 {
245 int i;
246
247 /* Remove any pending skb */
248 for (i = 0; i < TX_RING_ENTRIES; i++) {
249 if (priv->tx_skbs[i])
250 dev_kfree_skb(priv->tx_skbs[i]);
251 priv->tx_skbs[i] = NULL;
252 }
253 dma_free_coherent(NULL, TX_RING_BUFFER_SIZE, priv->tx_ring,
254 priv->tx_ring_dma);
255 }
256
257 /* Presumes RX DMA engine is stopped, and RX fifo ring is reset */
258 static void meth_free_rx_ring(struct meth_private *priv)
259 {
260 int i;
261
262 for (i = 0; i < RX_RING_ENTRIES; i++) {
263 dma_unmap_single(NULL, priv->rx_ring_dmas[i],
264 METH_RX_BUFF_SIZE, DMA_FROM_DEVICE);
265 priv->rx_ring[i] = 0;
266 priv->rx_ring_dmas[i] = 0;
267 kfree_skb(priv->rx_skbs[i]);
268 }
269 }
270
271 int meth_reset(struct net_device *dev)
272 {
273 struct meth_private *priv = (struct meth_private *) dev->priv;
274
275 /* Reset card */
276 mace->eth.mac_ctrl = SGI_MAC_RESET;
277 udelay(1);
278 mace->eth.mac_ctrl = 0;
279 udelay(25);
280
281 /* Load ethernet address */
282 load_eaddr(dev);
283 /* Should load some "errata", but later */
284
285 /* Check for device */
286 if (mdio_probe(priv) < 0) {
287 DPRINTK("Unable to find PHY\n");
288 return -ENODEV;
289 }
290
291 /* Initial mode: 10 | Half-duplex | Accept normal packets */
292 priv->mac_ctrl = METH_ACCEPT_MCAST | METH_DEFAULT_IPG;
293 if (dev->flags | IFF_PROMISC)
294 priv->mac_ctrl |= METH_PROMISC;
295 mace->eth.mac_ctrl = priv->mac_ctrl;
296
297 /* Autonegotiate speed and duplex mode */
298 meth_check_link(dev);
299
300 /* Now set dma control, but don't enable DMA, yet */
301 priv->dma_ctrl = (4 << METH_RX_OFFSET_SHIFT) |
302 (RX_RING_ENTRIES << METH_RX_DEPTH_SHIFT);
303 mace->eth.dma_ctrl = priv->dma_ctrl;
304
305 return 0;
306 }
307
308 /*============End Helper Routines=====================*/
309
310 /*
311 * Open and close
312 */
313 static int meth_open(struct net_device *dev)
314 {
315 struct meth_private *priv = dev->priv;
316 int ret;
317
318 priv->phy_addr = -1; /* No PHY is known yet... */
319
320 /* Initialize the hardware */
321 ret = meth_reset(dev);
322 if (ret < 0)
323 return ret;
324
325 /* Allocate the ring buffers */
326 ret = meth_init_tx_ring(priv);
327 if (ret < 0)
328 return ret;
329 ret = meth_init_rx_ring(priv);
330 if (ret < 0)
331 goto out_free_tx_ring;
332
333 ret = request_irq(dev->irq, meth_interrupt, 0, meth_str, dev);
334 if (ret) {
335 printk(KERN_ERR "%s: Can't get irq %d\n", dev->name, dev->irq);
336 goto out_free_rx_ring;
337 }
338
339 /* Start DMA */
340 priv->dma_ctrl |= METH_DMA_TX_EN | /*METH_DMA_TX_INT_EN |*/
341 METH_DMA_RX_EN | METH_DMA_RX_INT_EN;
342 mace->eth.dma_ctrl = priv->dma_ctrl;
343
344 DPRINTK("About to start queue\n");
345 netif_start_queue(dev);
346
347 return 0;
348
349 out_free_rx_ring:
350 meth_free_rx_ring(priv);
351 out_free_tx_ring:
352 meth_free_tx_ring(priv);
353
354 return ret;
355 }
356
357 static int meth_release(struct net_device *dev)
358 {
359 struct meth_private *priv = dev->priv;
360
361 DPRINTK("Stopping queue\n");
362 netif_stop_queue(dev); /* can't transmit any more */
363 /* shut down DMA */
364 priv->dma_ctrl &= ~(METH_DMA_TX_EN | METH_DMA_TX_INT_EN |
365 METH_DMA_RX_EN | METH_DMA_RX_INT_EN);
366 mace->eth.dma_ctrl = priv->dma_ctrl;
367 free_irq(dev->irq, dev);
368 meth_free_tx_ring(priv);
369 meth_free_rx_ring(priv);
370
371 return 0;
372 }
373
374 /*
375 * Receive a packet: retrieve, encapsulate and pass over to upper levels
376 */
377 static void meth_rx(struct net_device* dev, unsigned long int_status)
378 {
379 struct sk_buff *skb;
380 unsigned long status;
381 struct meth_private *priv = (struct meth_private *) dev->priv;
382 unsigned long fifo_rptr = (int_status & METH_INT_RX_RPTR_MASK) >> 8;
383
384 spin_lock(&priv->meth_lock);
385 priv->dma_ctrl &= ~METH_DMA_RX_INT_EN;
386 mace->eth.dma_ctrl = priv->dma_ctrl;
387 spin_unlock(&priv->meth_lock);
388
389 if (int_status & METH_INT_RX_UNDERFLOW) {
390 fifo_rptr = (fifo_rptr - 1) & 0x0f;
391 }
392 while (priv->rx_write != fifo_rptr) {
393 dma_unmap_single(NULL, priv->rx_ring_dmas[priv->rx_write],
394 METH_RX_BUFF_SIZE, DMA_FROM_DEVICE);
395 status = priv->rx_ring[priv->rx_write]->status.raw;
396 #if MFE_DEBUG
397 if (!(status & METH_RX_ST_VALID)) {
398 DPRINTK("Not received? status=%016lx\n",status);
399 }
400 #endif
401 if ((!(status & METH_RX_STATUS_ERRORS)) && (status & METH_RX_ST_VALID)) {
402 int len = (status & 0xffff) - 4; /* omit CRC */
403 /* length sanity check */
404 if (len < 60 || len > 1518) {
405 printk(KERN_DEBUG "%s: bogus packet size: %ld, status=%#2lx.\n",
406 dev->name, priv->rx_write,
407 priv->rx_ring[priv->rx_write]->status.raw);
408 priv->stats.rx_errors++;
409 priv->stats.rx_length_errors++;
410 skb = priv->rx_skbs[priv->rx_write];
411 } else {
412 skb = alloc_skb(METH_RX_BUFF_SIZE, GFP_ATOMIC | GFP_DMA);
413 if (!skb) {
414 /* Ouch! No memory! Drop packet on the floor */
415 DPRINTK("No mem: dropping packet\n");
416 priv->stats.rx_dropped++;
417 skb = priv->rx_skbs[priv->rx_write];
418 } else {
419 struct sk_buff *skb_c = priv->rx_skbs[priv->rx_write];
420 /* 8byte status vector + 3quad padding + 2byte padding,
421 * to put data on 64bit aligned boundary */
422 skb_reserve(skb, METH_RX_HEAD);
423 /* Write metadata, and then pass to the receive level */
424 skb_put(skb_c, len);
425 priv->rx_skbs[priv->rx_write] = skb;
426 skb_c->dev = dev;
427 skb_c->protocol = eth_type_trans(skb_c, dev);
428 dev->last_rx = jiffies;
429 priv->stats.rx_packets++;
430 priv->stats.rx_bytes += len;
431 netif_rx(skb_c);
432 }
433 }
434 } else {
435 priv->stats.rx_errors++;
436 skb=priv->rx_skbs[priv->rx_write];
437 #if MFE_DEBUG>0
438 printk(KERN_WARNING "meth: RX error: status=0x%016lx\n",status);
439 if(status&METH_RX_ST_RCV_CODE_VIOLATION)
440 printk(KERN_WARNING "Receive Code Violation\n");
441 if(status&METH_RX_ST_CRC_ERR)
442 printk(KERN_WARNING "CRC error\n");
443 if(status&METH_RX_ST_INV_PREAMBLE_CTX)
444 printk(KERN_WARNING "Invalid Preamble Context\n");
445 if(status&METH_RX_ST_LONG_EVT_SEEN)
446 printk(KERN_WARNING "Long Event Seen...\n");
447 if(status&METH_RX_ST_BAD_PACKET)
448 printk(KERN_WARNING "Bad Packet\n");
449 if(status&METH_RX_ST_CARRIER_EVT_SEEN)
450 printk(KERN_WARNING "Carrier Event Seen\n");
451 #endif
452 }
453 priv->rx_ring[priv->rx_write] = (rx_packet*)skb->head;
454 priv->rx_ring[priv->rx_write]->status.raw = 0;
455 priv->rx_ring_dmas[priv->rx_write] =
456 dma_map_single(NULL, priv->rx_ring[priv->rx_write],
457 METH_RX_BUFF_SIZE, DMA_FROM_DEVICE);
458 mace->eth.rx_fifo = priv->rx_ring_dmas[priv->rx_write];
459 ADVANCE_RX_PTR(priv->rx_write);
460 }
461 spin_lock(&priv->meth_lock);
462 /* In case there was underflow, and Rx DMA was disabled */
463 priv->dma_ctrl |= METH_DMA_RX_INT_EN | METH_DMA_RX_EN;
464 mace->eth.dma_ctrl = priv->dma_ctrl;
465 mace->eth.int_stat = METH_INT_RX_THRESHOLD;
466 spin_unlock(&priv->meth_lock);
467 }
468
469 static int meth_tx_full(struct net_device *dev)
470 {
471 struct meth_private *priv = (struct meth_private *) dev->priv;
472
473 return (priv->tx_count >= TX_RING_ENTRIES - 1);
474 }
475
476 static void meth_tx_cleanup(struct net_device* dev, unsigned long int_status)
477 {
478 struct meth_private *priv = dev->priv;
479 unsigned long status;
480 struct sk_buff *skb;
481 unsigned long rptr = (int_status&TX_INFO_RPTR) >> 16;
482
483 spin_lock(&priv->meth_lock);
484
485 /* Stop DMA notification */
486 priv->dma_ctrl &= ~(METH_DMA_TX_INT_EN);
487 mace->eth.dma_ctrl = priv->dma_ctrl;
488
489 while (priv->tx_read != rptr) {
490 skb = priv->tx_skbs[priv->tx_read];
491 status = priv->tx_ring[priv->tx_read].header.raw;
492 #if MFE_DEBUG>=1
493 if (priv->tx_read == priv->tx_write)
494 DPRINTK("Auchi! tx_read=%d,tx_write=%d,rptr=%d?\n", priv->tx_read, priv->tx_write,rptr);
495 #endif
496 if (status & METH_TX_ST_DONE) {
497 if (status & METH_TX_ST_SUCCESS){
498 priv->stats.tx_packets++;
499 priv->stats.tx_bytes += skb->len;
500 } else {
501 priv->stats.tx_errors++;
502 #if MFE_DEBUG>=1
503 DPRINTK("TX error: status=%016lx <",status);
504 if(status & METH_TX_ST_SUCCESS)
505 printk(" SUCCESS");
506 if(status & METH_TX_ST_TOOLONG)
507 printk(" TOOLONG");
508 if(status & METH_TX_ST_UNDERRUN)
509 printk(" UNDERRUN");
510 if(status & METH_TX_ST_EXCCOLL)
511 printk(" EXCCOLL");
512 if(status & METH_TX_ST_DEFER)
513 printk(" DEFER");
514 if(status & METH_TX_ST_LATECOLL)
515 printk(" LATECOLL");
516 printk(" >\n");
517 #endif
518 }
519 } else {
520 DPRINTK("RPTR points us here, but packet not done?\n");
521 break;
522 }
523 dev_kfree_skb_irq(skb);
524 priv->tx_skbs[priv->tx_read] = NULL;
525 priv->tx_ring[priv->tx_read].header.raw = 0;
526 priv->tx_read = (priv->tx_read+1)&(TX_RING_ENTRIES-1);
527 priv->tx_count--;
528 }
529
530 /* wake up queue if it was stopped */
531 if (netif_queue_stopped(dev) && !meth_tx_full(dev)) {
532 netif_wake_queue(dev);
533 }
534
535 mace->eth.int_stat = METH_INT_TX_EMPTY | METH_INT_TX_PKT;
536 spin_unlock(&priv->meth_lock);
537 }
538
539 static void meth_error(struct net_device* dev, unsigned status)
540 {
541 struct meth_private *priv = (struct meth_private *) dev->priv;
542
543 printk(KERN_WARNING "meth: error status: 0x%08x\n",status);
544 /* check for errors too... */
545 if (status & (METH_INT_TX_LINK_FAIL))
546 printk(KERN_WARNING "meth: link failure\n");
547 /* Should I do full reset in this case? */
548 if (status & (METH_INT_MEM_ERROR))
549 printk(KERN_WARNING "meth: memory error\n");
550 if (status & (METH_INT_TX_ABORT))
551 printk(KERN_WARNING "meth: aborted\n");
552 if (status & (METH_INT_RX_OVERFLOW))
553 printk(KERN_WARNING "meth: Rx overflow\n");
554 if (status & (METH_INT_RX_UNDERFLOW)) {
555 printk(KERN_WARNING "meth: Rx underflow\n");
556 spin_lock(&priv->meth_lock);
557 mace->eth.int_stat = METH_INT_RX_UNDERFLOW;
558 /* more underflow interrupts will be delivered,
559 * effectively throwing us into an infinite loop.
560 * Thus I stop processing Rx in this case. */
561 priv->dma_ctrl &= ~METH_DMA_RX_EN;
562 mace->eth.dma_ctrl = priv->dma_ctrl;
563 DPRINTK("Disabled meth Rx DMA temporarily\n");
564 spin_unlock(&priv->meth_lock);
565 }
566 mace->eth.int_stat = METH_INT_ERROR;
567 }
568
569 /*
570 * The typical interrupt entry point
571 */
572 static irqreturn_t meth_interrupt(int irq, void *dev_id, struct pt_regs *pregs)
573 {
574 struct net_device *dev = (struct net_device *)dev_id;
575 struct meth_private *priv = (struct meth_private *) dev->priv;
576 unsigned long status;
577
578 status = mace->eth.int_stat;
579 while (status & 0xff) {
580 /* First handle errors - if we get Rx underflow,
581 * Rx DMA will be disabled, and Rx handler will reenable
582 * it. I don't think it's possible to get Rx underflow,
583 * without getting Rx interrupt */
584 if (status & METH_INT_ERROR) {
585 meth_error(dev, status);
586 }
587 if (status & (METH_INT_TX_EMPTY | METH_INT_TX_PKT)) {
588 /* a transmission is over: free the skb */
589 meth_tx_cleanup(dev, status);
590 }
591 if (status & METH_INT_RX_THRESHOLD) {
592 if (!(priv->dma_ctrl & METH_DMA_RX_INT_EN))
593 break;
594 /* send it to meth_rx for handling */
595 meth_rx(dev, status);
596 }
597 status = mace->eth.int_stat;
598 }
599
600 return IRQ_HANDLED;
601 }
602
603 /*
604 * Transmits packets that fit into TX descriptor (are <=120B)
605 */
606 static void meth_tx_short_prepare(struct meth_private *priv,
607 struct sk_buff *skb)
608 {
609 tx_packet *desc = &priv->tx_ring[priv->tx_write];
610 int len = (skb->len < ETH_ZLEN) ? ETH_ZLEN : skb->len;
611
612 desc->header.raw = METH_TX_CMD_INT_EN | (len-1) | ((128-len) << 16);
613 /* maybe I should set whole thing to 0 first... */
614 memcpy(desc->data.dt + (120 - len), skb->data, skb->len);
615 if (skb->len < len)
616 memset(desc->data.dt + 120 - len + skb->len, 0, len-skb->len);
617 }
618 #define TX_CATBUF1 BIT(25)
619 static void meth_tx_1page_prepare(struct meth_private *priv,
620 struct sk_buff *skb)
621 {
622 tx_packet *desc = &priv->tx_ring[priv->tx_write];
623 void *buffer_data = (void *)(((unsigned long)skb->data + 7) & ~7);
624 int unaligned_len = (int)((unsigned long)buffer_data - (unsigned long)skb->data);
625 int buffer_len = skb->len - unaligned_len;
626 dma_addr_t catbuf;
627
628 desc->header.raw = METH_TX_CMD_INT_EN | TX_CATBUF1 | (skb->len - 1);
629
630 /* unaligned part */
631 if (unaligned_len) {
632 memcpy(desc->data.dt + (120 - unaligned_len),
633 skb->data, unaligned_len);
634 desc->header.raw |= (128 - unaligned_len) << 16;
635 }
636
637 /* first page */
638 catbuf = dma_map_single(NULL, buffer_data, buffer_len,
639 DMA_TO_DEVICE);
640 desc->data.cat_buf[0].form.start_addr = catbuf >> 3;
641 desc->data.cat_buf[0].form.len = buffer_len - 1;
642 }
643 #define TX_CATBUF2 BIT(26)
644 static void meth_tx_2page_prepare(struct meth_private *priv,
645 struct sk_buff *skb)
646 {
647 tx_packet *desc = &priv->tx_ring[priv->tx_write];
648 void *buffer1_data = (void *)(((unsigned long)skb->data + 7) & ~7);
649 void *buffer2_data = (void *)PAGE_ALIGN((unsigned long)skb->data);
650 int unaligned_len = (int)((unsigned long)buffer1_data - (unsigned long)skb->data);
651 int buffer1_len = (int)((unsigned long)buffer2_data - (unsigned long)buffer1_data);
652 int buffer2_len = skb->len - buffer1_len - unaligned_len;
653 dma_addr_t catbuf1, catbuf2;
654
655 desc->header.raw = METH_TX_CMD_INT_EN | TX_CATBUF1 | TX_CATBUF2| (skb->len - 1);
656 /* unaligned part */
657 if (unaligned_len){
658 memcpy(desc->data.dt + (120 - unaligned_len),
659 skb->data, unaligned_len);
660 desc->header.raw |= (128 - unaligned_len) << 16;
661 }
662
663 /* first page */
664 catbuf1 = dma_map_single(NULL, buffer1_data, buffer1_len,
665 DMA_TO_DEVICE);
666 desc->data.cat_buf[0].form.start_addr = catbuf1 >> 3;
667 desc->data.cat_buf[0].form.len = buffer1_len - 1;
668 /* second page */
669 catbuf2 = dma_map_single(NULL, buffer2_data, buffer2_len,
670 DMA_TO_DEVICE);
671 desc->data.cat_buf[1].form.start_addr = catbuf2 >> 3;
672 desc->data.cat_buf[1].form.len = buffer2_len - 1;
673 }
674
675 static void meth_add_to_tx_ring(struct meth_private *priv, struct sk_buff *skb)
676 {
677 /* Remember the skb, so we can free it at interrupt time */
678 priv->tx_skbs[priv->tx_write] = skb;
679 if (skb->len <= 120) {
680 /* Whole packet fits into descriptor */
681 meth_tx_short_prepare(priv, skb);
682 } else if (PAGE_ALIGN((unsigned long)skb->data) !=
683 PAGE_ALIGN((unsigned long)skb->data + skb->len - 1)) {
684 /* Packet crosses page boundary */
685 meth_tx_2page_prepare(priv, skb);
686 } else {
687 /* Packet is in one page */
688 meth_tx_1page_prepare(priv, skb);
689 }
690 priv->tx_write = (priv->tx_write + 1) & (TX_RING_ENTRIES - 1);
691 mace->eth.tx_info = priv->tx_write;
692 priv->tx_count++;
693 }
694
695 /*
696 * Transmit a packet (called by the kernel)
697 */
698 static int meth_tx(struct sk_buff *skb, struct net_device *dev)
699 {
700 struct meth_private *priv = (struct meth_private *) dev->priv;
701 unsigned long flags;
702
703 spin_lock_irqsave(&priv->meth_lock, flags);
704 /* Stop DMA notification */
705 priv->dma_ctrl &= ~(METH_DMA_TX_INT_EN);
706 mace->eth.dma_ctrl = priv->dma_ctrl;
707
708 meth_add_to_tx_ring(priv, skb);
709 dev->trans_start = jiffies; /* save the timestamp */
710
711 /* If TX ring is full, tell the upper layer to stop sending packets */
712 if (meth_tx_full(dev)) {
713 printk(KERN_DEBUG "TX full: stopping\n");
714 netif_stop_queue(dev);
715 }
716
717 /* Restart DMA notification */
718 priv->dma_ctrl |= METH_DMA_TX_INT_EN;
719 mace->eth.dma_ctrl = priv->dma_ctrl;
720
721 spin_unlock_irqrestore(&priv->meth_lock, flags);
722
723 return 0;
724 }
725
726 /*
727 * Deal with a transmit timeout.
728 */
729 static void meth_tx_timeout(struct net_device *dev)
730 {
731 struct meth_private *priv = (struct meth_private *) dev->priv;
732 unsigned long flags;
733
734 printk(KERN_WARNING "%s: transmit timed out\n", dev->name);
735
736 /* Protect against concurrent rx interrupts */
737 spin_lock_irqsave(&priv->meth_lock,flags);
738
739 /* Try to reset the interface. */
740 meth_reset(dev);
741
742 priv->stats.tx_errors++;
743
744 /* Clear all rings */
745 meth_free_tx_ring(priv);
746 meth_free_rx_ring(priv);
747 meth_init_tx_ring(priv);
748 meth_init_rx_ring(priv);
749
750 /* Restart dma */
751 priv->dma_ctrl |= METH_DMA_TX_EN | METH_DMA_RX_EN | METH_DMA_RX_INT_EN;
752 mace->eth.dma_ctrl = priv->dma_ctrl;
753
754 /* Enable interrupt */
755 spin_unlock_irqrestore(&priv->meth_lock, flags);
756
757 dev->trans_start = jiffies;
758 netif_wake_queue(dev);
759
760 return;
761 }
762
763 /*
764 * Ioctl commands
765 */
766 static int meth_ioctl(struct net_device *dev, struct ifreq *rq, int cmd)
767 {
768 /* XXX Not yet implemented */
769 switch(cmd) {
770 case SIOCGMIIPHY:
771 case SIOCGMIIREG:
772 case SIOCSMIIREG:
773 default:
774 return -EOPNOTSUPP;
775 }
776 }
777
778 /*
779 * Return statistics to the caller
780 */
781 static struct net_device_stats *meth_stats(struct net_device *dev)
782 {
783 struct meth_private *priv = (struct meth_private *) dev->priv;
784 return &priv->stats;
785 }
786
787 /*
788 * The init function.
789 */
790 static struct net_device *meth_init(void)
791 {
792 struct net_device *dev;
793 struct meth_private *priv;
794 int ret;
795
796 dev = alloc_etherdev(sizeof(struct meth_private));
797 if (!dev)
798 return ERR_PTR(-ENOMEM);
799
800 dev->open = meth_open;
801 dev->stop = meth_release;
802 dev->hard_start_xmit = meth_tx;
803 dev->do_ioctl = meth_ioctl;
804 dev->get_stats = meth_stats;
805 #ifdef HAVE_TX_TIMEOUT
806 dev->tx_timeout = meth_tx_timeout;
807 dev->watchdog_timeo = timeout;
808 #endif
809 dev->irq = MACE_ETHERNET_IRQ;
810 dev->base_addr = (unsigned long)&mace->eth;
811
812 priv = (struct meth_private *) dev->priv;
813 spin_lock_init(&priv->meth_lock);
814
815 ret = register_netdev(dev);
816 if (ret) {
817 free_netdev(dev);
818 return ERR_PTR(ret);
819 }
820
821 printk(KERN_INFO "%s: SGI MACE Ethernet rev. %d\n",
822 dev->name, (unsigned int)(mace->eth.mac_ctrl >> 29));
823 return 0;
824 }
825
826 static struct net_device *meth_dev;
827
828 static int __init meth_init_module(void)
829 {
830 meth_dev = meth_init();
831 if (IS_ERR(meth_dev))
832 return PTR_ERR(meth_dev);
833 return 0;
834 }
835
836 static void __exit meth_exit_module(void)
837 {
838 unregister_netdev(meth_dev);
839 free_netdev(meth_dev);
840 }
841
842 module_init(meth_init_module);
843 module_exit(meth_exit_module);
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