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Committer: Michael Beasley <mike@snafu.setup>
[mikesnafu-overlay.git] / drivers / net / meth.c
blobcdaa8fc218091a947996280d27c63caa16f56f84
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/delay.h>
12 #include <linux/dma-mapping.h>
13 #include <linux/init.h>
14 #include <linux/kernel.h>
15 #include <linux/module.h>
16 #include <linux/platform_device.h>
17 #include <linux/slab.h>
18 #include <linux/errno.h>
19 #include <linux/types.h>
20 #include <linux/interrupt.h>
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
37 #include "meth.h"
38
39 #ifndef MFE_DEBUG
40 #define MFE_DEBUG 0
41 #endif
42
43 #if MFE_DEBUG>=1
44 #define DPRINTK(str,args...) printk(KERN_DEBUG "meth: %s: " str, __FUNCTION__ , ## args)
45 #define MFE_RX_DEBUG 2
46 #else
47 #define DPRINTK(str,args...)
48 #define MFE_RX_DEBUG 0
49 #endif
50
51
52 static const char *meth_str="SGI O2 Fast Ethernet";
53
54 #define HAVE_TX_TIMEOUT
55 /* The maximum time waited (in jiffies) before assuming a Tx failed. (400ms) */
56 #define TX_TIMEOUT (400*HZ/1000)
57
58 #ifdef HAVE_TX_TIMEOUT
59 static int timeout = TX_TIMEOUT;
60 module_param(timeout, int, 0);
61 #endif
62
63 /*
64 * This structure is private to each device. It is used to pass
65 * packets in and out, so there is place for a packet
66 */
67 struct meth_private {
68 /* in-memory copy of MAC Control register */
69 unsigned long mac_ctrl;
70 /* in-memory copy of DMA Control register */
71 unsigned long dma_ctrl;
72 /* address of PHY, used by mdio_* functions, initialized in mdio_probe */
73 unsigned long phy_addr;
74 tx_packet *tx_ring;
75 dma_addr_t tx_ring_dma;
76 struct sk_buff *tx_skbs[TX_RING_ENTRIES];
77 dma_addr_t tx_skb_dmas[TX_RING_ENTRIES];
78 unsigned long tx_read, tx_write, tx_count;
79
80 rx_packet *rx_ring[RX_RING_ENTRIES];
81 dma_addr_t rx_ring_dmas[RX_RING_ENTRIES];
82 struct sk_buff *rx_skbs[RX_RING_ENTRIES];
83 unsigned long rx_write;
84
85 spinlock_t meth_lock;
86 };
87
88 static void meth_tx_timeout(struct net_device *dev);
89 static irqreturn_t meth_interrupt(int irq, void *dev_id);
90
91 /* global, initialized in ip32-setup.c */
92 char o2meth_eaddr[8]={0,0,0,0,0,0,0,0};
93
94 static inline void load_eaddr(struct net_device *dev)
95 {
96 int i;
97 DECLARE_MAC_BUF(mac);
98 u64 macaddr;
99
100 DPRINTK("Loading MAC Address: %s\n", print_mac(mac, dev->dev_addr));
101 macaddr = 0;
102 for (i = 0; i < 6; i++)
103 macaddr |= dev->dev_addr[i] << ((5 - i) * 8);
104
105 mace->eth.mac_addr = macaddr;
106 }
107
108 /*
109 * Waits for BUSY status of mdio bus to clear
110 */
111 #define WAIT_FOR_PHY(___rval) \
112 while ((___rval = mace->eth.phy_data) & MDIO_BUSY) { \
113 udelay(25); \
114 }
115 /*read phy register, return value read */
116 static unsigned long mdio_read(struct meth_private *priv, unsigned long phyreg)
117 {
118 unsigned long rval;
119 WAIT_FOR_PHY(rval);
120 mace->eth.phy_regs = (priv->phy_addr << 5) | (phyreg & 0x1f);
121 udelay(25);
122 mace->eth.phy_trans_go = 1;
123 udelay(25);
124 WAIT_FOR_PHY(rval);
125 return rval & MDIO_DATA_MASK;
126 }
127
128 static int mdio_probe(struct meth_private *priv)
129 {
130 int i;
131 unsigned long p2, p3;
132 /* check if phy is detected already */
133 if(priv->phy_addr>=0&&priv->phy_addr<32)
134 return 0;
135 spin_lock(&priv->meth_lock);
136 for (i=0;i<32;++i){
137 priv->phy_addr=i;
138 p2=mdio_read(priv,2);
139 p3=mdio_read(priv,3);
140 #if MFE_DEBUG>=2
141 switch ((p2<<12)|(p3>>4)){
142 case PHY_QS6612X:
143 DPRINTK("PHY is QS6612X\n");
144 break;
145 case PHY_ICS1889:
146 DPRINTK("PHY is ICS1889\n");
147 break;
148 case PHY_ICS1890:
149 DPRINTK("PHY is ICS1890\n");
150 break;
151 case PHY_DP83840:
152 DPRINTK("PHY is DP83840\n");
153 break;
154 }
155 #endif
156 if(p2!=0xffff&&p2!=0x0000){
157 DPRINTK("PHY code: %x\n",(p2<<12)|(p3>>4));
158 break;
159 }
160 }
161 spin_unlock(&priv->meth_lock);
162 if(priv->phy_addr<32) {
163 return 0;
164 }
165 DPRINTK("Oopsie! PHY is not known!\n");
166 priv->phy_addr=-1;
167 return -ENODEV;
168 }
169
170 static void meth_check_link(struct net_device *dev)
171 {
172 struct meth_private *priv = netdev_priv(dev);
173 unsigned long mii_advertising = mdio_read(priv, 4);
174 unsigned long mii_partner = mdio_read(priv, 5);
175 unsigned long negotiated = mii_advertising & mii_partner;
176 unsigned long duplex, speed;
177
178 if (mii_partner == 0xffff)
179 return;
180
181 speed = (negotiated & 0x0380) ? METH_100MBIT : 0;
182 duplex = ((negotiated & 0x0100) || (negotiated & 0x01C0) == 0x0040) ?
183 METH_PHY_FDX : 0;
184
185 if ((priv->mac_ctrl & METH_PHY_FDX) ^ duplex) {
186 DPRINTK("Setting %s-duplex\n", duplex ? "full" : "half");
187 if (duplex)
188 priv->mac_ctrl |= METH_PHY_FDX;
189 else
190 priv->mac_ctrl &= ~METH_PHY_FDX;
191 mace->eth.mac_ctrl = priv->mac_ctrl;
192 }
193
194 if ((priv->mac_ctrl & METH_100MBIT) ^ speed) {
195 DPRINTK("Setting %dMbs mode\n", speed ? 100 : 10);
196 if (duplex)
197 priv->mac_ctrl |= METH_100MBIT;
198 else
199 priv->mac_ctrl &= ~METH_100MBIT;
200 mace->eth.mac_ctrl = priv->mac_ctrl;
201 }
202 }
203
204
205 static int meth_init_tx_ring(struct meth_private *priv)
206 {
207 /* Init TX ring */
208 priv->tx_ring = dma_alloc_coherent(NULL, TX_RING_BUFFER_SIZE,
209 &priv->tx_ring_dma, GFP_ATOMIC);
210 if (!priv->tx_ring)
211 return -ENOMEM;
212 memset(priv->tx_ring, 0, TX_RING_BUFFER_SIZE);
213 priv->tx_count = priv->tx_read = priv->tx_write = 0;
214 mace->eth.tx_ring_base = priv->tx_ring_dma;
215 /* Now init skb save area */
216 memset(priv->tx_skbs, 0, sizeof(priv->tx_skbs));
217 memset(priv->tx_skb_dmas, 0, sizeof(priv->tx_skb_dmas));
218 return 0;
219 }
220
221 static int meth_init_rx_ring(struct meth_private *priv)
222 {
223 int i;
224
225 for (i = 0; i < RX_RING_ENTRIES; i++) {
226 priv->rx_skbs[i] = alloc_skb(METH_RX_BUFF_SIZE, 0);
227 /* 8byte status vector + 3quad padding + 2byte padding,
228 * to put data on 64bit aligned boundary */
229 skb_reserve(priv->rx_skbs[i],METH_RX_HEAD);
230 priv->rx_ring[i]=(rx_packet*)(priv->rx_skbs[i]->head);
231 /* I'll need to re-sync it after each RX */
232 priv->rx_ring_dmas[i] =
233 dma_map_single(NULL, priv->rx_ring[i],
234 METH_RX_BUFF_SIZE, DMA_FROM_DEVICE);
235 mace->eth.rx_fifo = priv->rx_ring_dmas[i];
236 }
237 priv->rx_write = 0;
238 return 0;
239 }
240 static void meth_free_tx_ring(struct meth_private *priv)
241 {
242 int i;
243
244 /* Remove any pending skb */
245 for (i = 0; i < TX_RING_ENTRIES; i++) {
246 if (priv->tx_skbs[i])
247 dev_kfree_skb(priv->tx_skbs[i]);
248 priv->tx_skbs[i] = NULL;
249 }
250 dma_free_coherent(NULL, TX_RING_BUFFER_SIZE, priv->tx_ring,
251 priv->tx_ring_dma);
252 }
253
254 /* Presumes RX DMA engine is stopped, and RX fifo ring is reset */
255 static void meth_free_rx_ring(struct meth_private *priv)
256 {
257 int i;
258
259 for (i = 0; i < RX_RING_ENTRIES; i++) {
260 dma_unmap_single(NULL, priv->rx_ring_dmas[i],
261 METH_RX_BUFF_SIZE, DMA_FROM_DEVICE);
262 priv->rx_ring[i] = 0;
263 priv->rx_ring_dmas[i] = 0;
264 kfree_skb(priv->rx_skbs[i]);
265 }
266 }
267
268 int meth_reset(struct net_device *dev)
269 {
270 struct meth_private *priv = netdev_priv(dev);
271
272 /* Reset card */
273 mace->eth.mac_ctrl = SGI_MAC_RESET;
274 udelay(1);
275 mace->eth.mac_ctrl = 0;
276 udelay(25);
277
278 /* Load ethernet address */
279 load_eaddr(dev);
280 /* Should load some "errata", but later */
281
282 /* Check for device */
283 if (mdio_probe(priv) < 0) {
284 DPRINTK("Unable to find PHY\n");
285 return -ENODEV;
286 }
287
288 /* Initial mode: 10 | Half-duplex | Accept normal packets */
289 priv->mac_ctrl = METH_ACCEPT_MCAST | METH_DEFAULT_IPG;
290 if (dev->flags | IFF_PROMISC)
291 priv->mac_ctrl |= METH_PROMISC;
292 mace->eth.mac_ctrl = priv->mac_ctrl;
293
294 /* Autonegotiate speed and duplex mode */
295 meth_check_link(dev);
296
297 /* Now set dma control, but don't enable DMA, yet */
298 priv->dma_ctrl = (4 << METH_RX_OFFSET_SHIFT) |
299 (RX_RING_ENTRIES << METH_RX_DEPTH_SHIFT);
300 mace->eth.dma_ctrl = priv->dma_ctrl;
301
302 return 0;
303 }
304
305 /*============End Helper Routines=====================*/
306
307 /*
308 * Open and close
309 */
310 static int meth_open(struct net_device *dev)
311 {
312 struct meth_private *priv = netdev_priv(dev);
313 int ret;
314
315 priv->phy_addr = -1; /* No PHY is known yet... */
316
317 /* Initialize the hardware */
318 ret = meth_reset(dev);
319 if (ret < 0)
320 return ret;
321
322 /* Allocate the ring buffers */
323 ret = meth_init_tx_ring(priv);
324 if (ret < 0)
325 return ret;
326 ret = meth_init_rx_ring(priv);
327 if (ret < 0)
328 goto out_free_tx_ring;
329
330 ret = request_irq(dev->irq, meth_interrupt, 0, meth_str, dev);
331 if (ret) {
332 printk(KERN_ERR "%s: Can't get irq %d\n", dev->name, dev->irq);
333 goto out_free_rx_ring;
334 }
335
336 /* Start DMA */
337 priv->dma_ctrl |= METH_DMA_TX_EN | /*METH_DMA_TX_INT_EN |*/
338 METH_DMA_RX_EN | METH_DMA_RX_INT_EN;
339 mace->eth.dma_ctrl = priv->dma_ctrl;
340
341 DPRINTK("About to start queue\n");
342 netif_start_queue(dev);
343
344 return 0;
345
346 out_free_rx_ring:
347 meth_free_rx_ring(priv);
348 out_free_tx_ring:
349 meth_free_tx_ring(priv);
350
351 return ret;
352 }
353
354 static int meth_release(struct net_device *dev)
355 {
356 struct meth_private *priv = netdev_priv(dev);
357
358 DPRINTK("Stopping queue\n");
359 netif_stop_queue(dev); /* can't transmit any more */
360 /* shut down DMA */
361 priv->dma_ctrl &= ~(METH_DMA_TX_EN | METH_DMA_TX_INT_EN |
362 METH_DMA_RX_EN | METH_DMA_RX_INT_EN);
363 mace->eth.dma_ctrl = priv->dma_ctrl;
364 free_irq(dev->irq, dev);
365 meth_free_tx_ring(priv);
366 meth_free_rx_ring(priv);
367
368 return 0;
369 }
370
371 /*
372 * Receive a packet: retrieve, encapsulate and pass over to upper levels
373 */
374 static void meth_rx(struct net_device* dev, unsigned long int_status)
375 {
376 struct sk_buff *skb;
377 unsigned long status;
378 struct meth_private *priv = netdev_priv(dev);
379 unsigned long fifo_rptr = (int_status & METH_INT_RX_RPTR_MASK) >> 8;
380
381 spin_lock(&priv->meth_lock);
382 priv->dma_ctrl &= ~METH_DMA_RX_INT_EN;
383 mace->eth.dma_ctrl = priv->dma_ctrl;
384 spin_unlock(&priv->meth_lock);
385
386 if (int_status & METH_INT_RX_UNDERFLOW) {
387 fifo_rptr = (fifo_rptr - 1) & 0x0f;
388 }
389 while (priv->rx_write != fifo_rptr) {
390 dma_unmap_single(NULL, priv->rx_ring_dmas[priv->rx_write],
391 METH_RX_BUFF_SIZE, DMA_FROM_DEVICE);
392 status = priv->rx_ring[priv->rx_write]->status.raw;
393 #if MFE_DEBUG
394 if (!(status & METH_RX_ST_VALID)) {
395 DPRINTK("Not received? status=%016lx\n",status);
396 }
397 #endif
398 if ((!(status & METH_RX_STATUS_ERRORS)) && (status & METH_RX_ST_VALID)) {
399 int len = (status & 0xffff) - 4; /* omit CRC */
400 /* length sanity check */
401 if (len < 60 || len > 1518) {
402 printk(KERN_DEBUG "%s: bogus packet size: %ld, status=%#2lx.\n",
403 dev->name, priv->rx_write,
404 priv->rx_ring[priv->rx_write]->status.raw);
405 dev->stats.rx_errors++;
406 dev->stats.rx_length_errors++;
407 skb = priv->rx_skbs[priv->rx_write];
408 } else {
409 skb = alloc_skb(METH_RX_BUFF_SIZE, GFP_ATOMIC);
410 if (!skb) {
411 /* Ouch! No memory! Drop packet on the floor */
412 DPRINTK("No mem: dropping packet\n");
413 dev->stats.rx_dropped++;
414 skb = priv->rx_skbs[priv->rx_write];
415 } else {
416 struct sk_buff *skb_c = priv->rx_skbs[priv->rx_write];
417 /* 8byte status vector + 3quad padding + 2byte padding,
418 * to put data on 64bit aligned boundary */
419 skb_reserve(skb, METH_RX_HEAD);
420 /* Write metadata, and then pass to the receive level */
421 skb_put(skb_c, len);
422 priv->rx_skbs[priv->rx_write] = skb;
423 skb_c->protocol = eth_type_trans(skb_c, dev);
424 dev->last_rx = jiffies;
425 dev->stats.rx_packets++;
426 dev->stats.rx_bytes += len;
427 netif_rx(skb_c);
428 }
429 }
430 } else {
431 dev->stats.rx_errors++;
432 skb=priv->rx_skbs[priv->rx_write];
433 #if MFE_DEBUG>0
434 printk(KERN_WARNING "meth: RX error: status=0x%016lx\n",status);
435 if(status&METH_RX_ST_RCV_CODE_VIOLATION)
436 printk(KERN_WARNING "Receive Code Violation\n");
437 if(status&METH_RX_ST_CRC_ERR)
438 printk(KERN_WARNING "CRC error\n");
439 if(status&METH_RX_ST_INV_PREAMBLE_CTX)
440 printk(KERN_WARNING "Invalid Preamble Context\n");
441 if(status&METH_RX_ST_LONG_EVT_SEEN)
442 printk(KERN_WARNING "Long Event Seen...\n");
443 if(status&METH_RX_ST_BAD_PACKET)
444 printk(KERN_WARNING "Bad Packet\n");
445 if(status&METH_RX_ST_CARRIER_EVT_SEEN)
446 printk(KERN_WARNING "Carrier Event Seen\n");
447 #endif
448 }
449 priv->rx_ring[priv->rx_write] = (rx_packet*)skb->head;
450 priv->rx_ring[priv->rx_write]->status.raw = 0;
451 priv->rx_ring_dmas[priv->rx_write] =
452 dma_map_single(NULL, priv->rx_ring[priv->rx_write],
453 METH_RX_BUFF_SIZE, DMA_FROM_DEVICE);
454 mace->eth.rx_fifo = priv->rx_ring_dmas[priv->rx_write];
455 ADVANCE_RX_PTR(priv->rx_write);
456 }
457 spin_lock(&priv->meth_lock);
458 /* In case there was underflow, and Rx DMA was disabled */
459 priv->dma_ctrl |= METH_DMA_RX_INT_EN | METH_DMA_RX_EN;
460 mace->eth.dma_ctrl = priv->dma_ctrl;
461 mace->eth.int_stat = METH_INT_RX_THRESHOLD;
462 spin_unlock(&priv->meth_lock);
463 }
464
465 static int meth_tx_full(struct net_device *dev)
466 {
467 struct meth_private *priv = netdev_priv(dev);
468
469 return (priv->tx_count >= TX_RING_ENTRIES - 1);
470 }
471
472 static void meth_tx_cleanup(struct net_device* dev, unsigned long int_status)
473 {
474 struct meth_private *priv = netdev_priv(dev);
475 unsigned long status;
476 struct sk_buff *skb;
477 unsigned long rptr = (int_status&TX_INFO_RPTR) >> 16;
478
479 spin_lock(&priv->meth_lock);
480
481 /* Stop DMA notification */
482 priv->dma_ctrl &= ~(METH_DMA_TX_INT_EN);
483 mace->eth.dma_ctrl = priv->dma_ctrl;
484
485 while (priv->tx_read != rptr) {
486 skb = priv->tx_skbs[priv->tx_read];
487 status = priv->tx_ring[priv->tx_read].header.raw;
488 #if MFE_DEBUG>=1
489 if (priv->tx_read == priv->tx_write)
490 DPRINTK("Auchi! tx_read=%d,tx_write=%d,rptr=%d?\n", priv->tx_read, priv->tx_write,rptr);
491 #endif
492 if (status & METH_TX_ST_DONE) {
493 if (status & METH_TX_ST_SUCCESS){
494 dev->stats.tx_packets++;
495 dev->stats.tx_bytes += skb->len;
496 } else {
497 dev->stats.tx_errors++;
498 #if MFE_DEBUG>=1
499 DPRINTK("TX error: status=%016lx <",status);
500 if(status & METH_TX_ST_SUCCESS)
501 printk(" SUCCESS");
502 if(status & METH_TX_ST_TOOLONG)
503 printk(" TOOLONG");
504 if(status & METH_TX_ST_UNDERRUN)
505 printk(" UNDERRUN");
506 if(status & METH_TX_ST_EXCCOLL)
507 printk(" EXCCOLL");
508 if(status & METH_TX_ST_DEFER)
509 printk(" DEFER");
510 if(status & METH_TX_ST_LATECOLL)
511 printk(" LATECOLL");
512 printk(" >\n");
513 #endif
514 }
515 } else {
516 DPRINTK("RPTR points us here, but packet not done?\n");
517 break;
518 }
519 dev_kfree_skb_irq(skb);
520 priv->tx_skbs[priv->tx_read] = NULL;
521 priv->tx_ring[priv->tx_read].header.raw = 0;
522 priv->tx_read = (priv->tx_read+1)&(TX_RING_ENTRIES-1);
523 priv->tx_count--;
524 }
525
526 /* wake up queue if it was stopped */
527 if (netif_queue_stopped(dev) && !meth_tx_full(dev)) {
528 netif_wake_queue(dev);
529 }
530
531 mace->eth.int_stat = METH_INT_TX_EMPTY | METH_INT_TX_PKT;
532 spin_unlock(&priv->meth_lock);
533 }
534
535 static void meth_error(struct net_device* dev, unsigned status)
536 {
537 struct meth_private *priv = netdev_priv(dev);
538
539 printk(KERN_WARNING "meth: error status: 0x%08x\n",status);
540 /* check for errors too... */
541 if (status & (METH_INT_TX_LINK_FAIL))
542 printk(KERN_WARNING "meth: link failure\n");
543 /* Should I do full reset in this case? */
544 if (status & (METH_INT_MEM_ERROR))
545 printk(KERN_WARNING "meth: memory error\n");
546 if (status & (METH_INT_TX_ABORT))
547 printk(KERN_WARNING "meth: aborted\n");
548 if (status & (METH_INT_RX_OVERFLOW))
549 printk(KERN_WARNING "meth: Rx overflow\n");
550 if (status & (METH_INT_RX_UNDERFLOW)) {
551 printk(KERN_WARNING "meth: Rx underflow\n");
552 spin_lock(&priv->meth_lock);
553 mace->eth.int_stat = METH_INT_RX_UNDERFLOW;
554 /* more underflow interrupts will be delivered,
555 * effectively throwing us into an infinite loop.
556 * Thus I stop processing Rx in this case. */
557 priv->dma_ctrl &= ~METH_DMA_RX_EN;
558 mace->eth.dma_ctrl = priv->dma_ctrl;
559 DPRINTK("Disabled meth Rx DMA temporarily\n");
560 spin_unlock(&priv->meth_lock);
561 }
562 mace->eth.int_stat = METH_INT_ERROR;
563 }
564
565 /*
566 * The typical interrupt entry point
567 */
568 static irqreturn_t meth_interrupt(int irq, void *dev_id)
569 {
570 struct net_device *dev = (struct net_device *)dev_id;
571 struct meth_private *priv = netdev_priv(dev);
572 unsigned long status;
573
574 status = mace->eth.int_stat;
575 while (status & 0xff) {
576 /* First handle errors - if we get Rx underflow,
577 * Rx DMA will be disabled, and Rx handler will reenable
578 * it. I don't think it's possible to get Rx underflow,
579 * without getting Rx interrupt */
580 if (status & METH_INT_ERROR) {
581 meth_error(dev, status);
582 }
583 if (status & (METH_INT_TX_EMPTY | METH_INT_TX_PKT)) {
584 /* a transmission is over: free the skb */
585 meth_tx_cleanup(dev, status);
586 }
587 if (status & METH_INT_RX_THRESHOLD) {
588 if (!(priv->dma_ctrl & METH_DMA_RX_INT_EN))
589 break;
590 /* send it to meth_rx for handling */
591 meth_rx(dev, status);
592 }
593 status = mace->eth.int_stat;
594 }
595
596 return IRQ_HANDLED;
597 }
598
599 /*
600 * Transmits packets that fit into TX descriptor (are <=120B)
601 */
602 static void meth_tx_short_prepare(struct meth_private *priv,
603 struct sk_buff *skb)
604 {
605 tx_packet *desc = &priv->tx_ring[priv->tx_write];
606 int len = (skb->len < ETH_ZLEN) ? ETH_ZLEN : skb->len;
607
608 desc->header.raw = METH_TX_CMD_INT_EN | (len-1) | ((128-len) << 16);
609 /* maybe I should set whole thing to 0 first... */
610 skb_copy_from_linear_data(skb, desc->data.dt + (120 - len), skb->len);
611 if (skb->len < len)
612 memset(desc->data.dt + 120 - len + skb->len, 0, len-skb->len);
613 }
614 #define TX_CATBUF1 BIT(25)
615 static void meth_tx_1page_prepare(struct meth_private *priv,
616 struct sk_buff *skb)
617 {
618 tx_packet *desc = &priv->tx_ring[priv->tx_write];
619 void *buffer_data = (void *)(((unsigned long)skb->data + 7) & ~7);
620 int unaligned_len = (int)((unsigned long)buffer_data - (unsigned long)skb->data);
621 int buffer_len = skb->len - unaligned_len;
622 dma_addr_t catbuf;
623
624 desc->header.raw = METH_TX_CMD_INT_EN | TX_CATBUF1 | (skb->len - 1);
625
626 /* unaligned part */
627 if (unaligned_len) {
628 skb_copy_from_linear_data(skb, desc->data.dt + (120 - unaligned_len),
629 unaligned_len);
630 desc->header.raw |= (128 - unaligned_len) << 16;
631 }
632
633 /* first page */
634 catbuf = dma_map_single(NULL, buffer_data, buffer_len,
635 DMA_TO_DEVICE);
636 desc->data.cat_buf[0].form.start_addr = catbuf >> 3;
637 desc->data.cat_buf[0].form.len = buffer_len - 1;
638 }
639 #define TX_CATBUF2 BIT(26)
640 static void meth_tx_2page_prepare(struct meth_private *priv,
641 struct sk_buff *skb)
642 {
643 tx_packet *desc = &priv->tx_ring[priv->tx_write];
644 void *buffer1_data = (void *)(((unsigned long)skb->data + 7) & ~7);
645 void *buffer2_data = (void *)PAGE_ALIGN((unsigned long)skb->data);
646 int unaligned_len = (int)((unsigned long)buffer1_data - (unsigned long)skb->data);
647 int buffer1_len = (int)((unsigned long)buffer2_data - (unsigned long)buffer1_data);
648 int buffer2_len = skb->len - buffer1_len - unaligned_len;
649 dma_addr_t catbuf1, catbuf2;
650
651 desc->header.raw = METH_TX_CMD_INT_EN | TX_CATBUF1 | TX_CATBUF2| (skb->len - 1);
652 /* unaligned part */
653 if (unaligned_len){
654 skb_copy_from_linear_data(skb, desc->data.dt + (120 - unaligned_len),
655 unaligned_len);
656 desc->header.raw |= (128 - unaligned_len) << 16;
657 }
658
659 /* first page */
660 catbuf1 = dma_map_single(NULL, buffer1_data, buffer1_len,
661 DMA_TO_DEVICE);
662 desc->data.cat_buf[0].form.start_addr = catbuf1 >> 3;
663 desc->data.cat_buf[0].form.len = buffer1_len - 1;
664 /* second page */
665 catbuf2 = dma_map_single(NULL, buffer2_data, buffer2_len,
666 DMA_TO_DEVICE);
667 desc->data.cat_buf[1].form.start_addr = catbuf2 >> 3;
668 desc->data.cat_buf[1].form.len = buffer2_len - 1;
669 }
670
671 static void meth_add_to_tx_ring(struct meth_private *priv, struct sk_buff *skb)
672 {
673 /* Remember the skb, so we can free it at interrupt time */
674 priv->tx_skbs[priv->tx_write] = skb;
675 if (skb->len <= 120) {
676 /* Whole packet fits into descriptor */
677 meth_tx_short_prepare(priv, skb);
678 } else if (PAGE_ALIGN((unsigned long)skb->data) !=
679 PAGE_ALIGN((unsigned long)skb->data + skb->len - 1)) {
680 /* Packet crosses page boundary */
681 meth_tx_2page_prepare(priv, skb);
682 } else {
683 /* Packet is in one page */
684 meth_tx_1page_prepare(priv, skb);
685 }
686 priv->tx_write = (priv->tx_write + 1) & (TX_RING_ENTRIES - 1);
687 mace->eth.tx_info = priv->tx_write;
688 priv->tx_count++;
689 }
690
691 /*
692 * Transmit a packet (called by the kernel)
693 */
694 static int meth_tx(struct sk_buff *skb, struct net_device *dev)
695 {
696 struct meth_private *priv = netdev_priv(dev);
697 unsigned long flags;
698
699 spin_lock_irqsave(&priv->meth_lock, flags);
700 /* Stop DMA notification */
701 priv->dma_ctrl &= ~(METH_DMA_TX_INT_EN);
702 mace->eth.dma_ctrl = priv->dma_ctrl;
703
704 meth_add_to_tx_ring(priv, skb);
705 dev->trans_start = jiffies; /* save the timestamp */
706
707 /* If TX ring is full, tell the upper layer to stop sending packets */
708 if (meth_tx_full(dev)) {
709 printk(KERN_DEBUG "TX full: stopping\n");
710 netif_stop_queue(dev);
711 }
712
713 /* Restart DMA notification */
714 priv->dma_ctrl |= METH_DMA_TX_INT_EN;
715 mace->eth.dma_ctrl = priv->dma_ctrl;
716
717 spin_unlock_irqrestore(&priv->meth_lock, flags);
718
719 return 0;
720 }
721
722 /*
723 * Deal with a transmit timeout.
724 */
725 static void meth_tx_timeout(struct net_device *dev)
726 {
727 struct meth_private *priv = netdev_priv(dev);
728 unsigned long flags;
729
730 printk(KERN_WARNING "%s: transmit timed out\n", dev->name);
731
732 /* Protect against concurrent rx interrupts */
733 spin_lock_irqsave(&priv->meth_lock,flags);
734
735 /* Try to reset the interface. */
736 meth_reset(dev);
737
738 dev->stats.tx_errors++;
739
740 /* Clear all rings */
741 meth_free_tx_ring(priv);
742 meth_free_rx_ring(priv);
743 meth_init_tx_ring(priv);
744 meth_init_rx_ring(priv);
745
746 /* Restart dma */
747 priv->dma_ctrl |= METH_DMA_TX_EN | METH_DMA_RX_EN | METH_DMA_RX_INT_EN;
748 mace->eth.dma_ctrl = priv->dma_ctrl;
749
750 /* Enable interrupt */
751 spin_unlock_irqrestore(&priv->meth_lock, flags);
752
753 dev->trans_start = jiffies;
754 netif_wake_queue(dev);
755
756 return;
757 }
758
759 /*
760 * Ioctl commands
761 */
762 static int meth_ioctl(struct net_device *dev, struct ifreq *rq, int cmd)
763 {
764 /* XXX Not yet implemented */
765 switch(cmd) {
766 case SIOCGMIIPHY:
767 case SIOCGMIIREG:
768 case SIOCSMIIREG:
769 default:
770 return -EOPNOTSUPP;
771 }
772 }
773
774 /*
775 * Return statistics to the caller
776 */
777 /*
778 * The init function.
779 */
780 static int __init meth_probe(struct platform_device *pdev)
781 {
782 struct net_device *dev;
783 struct meth_private *priv;
784 int err;
785
786 dev = alloc_etherdev(sizeof(struct meth_private));
787 if (!dev)
788 return -ENOMEM;
789
790 dev->open = meth_open;
791 dev->stop = meth_release;
792 dev->hard_start_xmit = meth_tx;
793 dev->do_ioctl = meth_ioctl;
794 #ifdef HAVE_TX_TIMEOUT
795 dev->tx_timeout = meth_tx_timeout;
796 dev->watchdog_timeo = timeout;
797 #endif
798 dev->irq = MACE_ETHERNET_IRQ;
799 dev->base_addr = (unsigned long)&mace->eth;
800 memcpy(dev->dev_addr, o2meth_eaddr, 6);
801
802 priv = netdev_priv(dev);
803 spin_lock_init(&priv->meth_lock);
804 SET_NETDEV_DEV(dev, &pdev->dev);
805
806 err = register_netdev(dev);
807 if (err) {
808 free_netdev(dev);
809 return err;
810 }
811
812 printk(KERN_INFO "%s: SGI MACE Ethernet rev. %d\n",
813 dev->name, (unsigned int)(mace->eth.mac_ctrl >> 29));
814 return 0;
815 }
816
817 static int __exit meth_remove(struct platform_device *pdev)
818 {
819 struct net_device *dev = platform_get_drvdata(pdev);
820
821 unregister_netdev(dev);
822 free_netdev(dev);
823 platform_set_drvdata(pdev, NULL);
824
825 return 0;
826 }
827
828 static struct platform_driver meth_driver = {
829 .probe = meth_probe,
830 .remove = __devexit_p(meth_remove),
831 .driver = {
832 .name = "meth",
833 }
834 };
835
836 static int __init meth_init_module(void)
837 {
838 int err;
839
840 err = platform_driver_register(&meth_driver);
841 if (err)
842 printk(KERN_ERR "Driver registration failed\n");
843
844 return err;
845 }
846
847 static void __exit meth_exit_module(void)
848 {
849 platform_driver_unregister(&meth_driver);
850 }
851
852 module_init(meth_init_module);
853 module_exit(meth_exit_module);
854
855 MODULE_AUTHOR("Ilya Volynets <ilya@theIlya.com>");
856 MODULE_DESCRIPTION("SGI O2 Builtin Fast Ethernet driver");
857 MODULE_LICENSE("GPL");
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