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ondemand: Solve a big performance issue by counting IOWAIT time as busy
[linux/fpc-iii.git] / drivers / net / meth.c
blob9f72cb45f4af65933b41b5ec5951032fd5ad6a09
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, __func__ , ## 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 /* The maximum time waited (in jiffies) before assuming a Tx failed. (400ms) */
55 #define TX_TIMEOUT (400*HZ/1000)
56
57 static int timeout = TX_TIMEOUT;
58 module_param(timeout, int, 0);
59
60 /*
61 * This structure is private to each device. It is used to pass
62 * packets in and out, so there is place for a packet
63 */
64 struct meth_private {
65 /* in-memory copy of MAC Control register */
66 unsigned long mac_ctrl;
67 /* in-memory copy of DMA Control register */
68 unsigned long dma_ctrl;
69 /* address of PHY, used by mdio_* functions, initialized in mdio_probe */
70 unsigned long phy_addr;
71 tx_packet *tx_ring;
72 dma_addr_t tx_ring_dma;
73 struct sk_buff *tx_skbs[TX_RING_ENTRIES];
74 dma_addr_t tx_skb_dmas[TX_RING_ENTRIES];
75 unsigned long tx_read, tx_write, tx_count;
76
77 rx_packet *rx_ring[RX_RING_ENTRIES];
78 dma_addr_t rx_ring_dmas[RX_RING_ENTRIES];
79 struct sk_buff *rx_skbs[RX_RING_ENTRIES];
80 unsigned long rx_write;
81
82 spinlock_t meth_lock;
83 };
84
85 static void meth_tx_timeout(struct net_device *dev);
86 static irqreturn_t meth_interrupt(int irq, void *dev_id);
87
88 /* global, initialized in ip32-setup.c */
89 char o2meth_eaddr[8]={0,0,0,0,0,0,0,0};
90
91 static inline void load_eaddr(struct net_device *dev)
92 {
93 int i;
94 u64 macaddr;
95
96 DPRINTK("Loading MAC Address: %pM\n", dev->dev_addr);
97 macaddr = 0;
98 for (i = 0; i < 6; i++)
99 macaddr |= (u64)dev->dev_addr[i] << ((5 - i) * 8);
100
101 mace->eth.mac_addr = macaddr;
102 }
103
104 /*
105 * Waits for BUSY status of mdio bus to clear
106 */
107 #define WAIT_FOR_PHY(___rval) \
108 while ((___rval = mace->eth.phy_data) & MDIO_BUSY) { \
109 udelay(25); \
110 }
111 /*read phy register, return value read */
112 static unsigned long mdio_read(struct meth_private *priv, unsigned long phyreg)
113 {
114 unsigned long rval;
115 WAIT_FOR_PHY(rval);
116 mace->eth.phy_regs = (priv->phy_addr << 5) | (phyreg & 0x1f);
117 udelay(25);
118 mace->eth.phy_trans_go = 1;
119 udelay(25);
120 WAIT_FOR_PHY(rval);
121 return rval & MDIO_DATA_MASK;
122 }
123
124 static int mdio_probe(struct meth_private *priv)
125 {
126 int i;
127 unsigned long p2, p3, flags;
128 /* check if phy is detected already */
129 if(priv->phy_addr>=0&&priv->phy_addr<32)
130 return 0;
131 spin_lock_irqsave(&priv->meth_lock, flags);
132 for (i=0;i<32;++i){
133 priv->phy_addr=i;
134 p2=mdio_read(priv,2);
135 p3=mdio_read(priv,3);
136 #if MFE_DEBUG>=2
137 switch ((p2<<12)|(p3>>4)){
138 case PHY_QS6612X:
139 DPRINTK("PHY is QS6612X\n");
140 break;
141 case PHY_ICS1889:
142 DPRINTK("PHY is ICS1889\n");
143 break;
144 case PHY_ICS1890:
145 DPRINTK("PHY is ICS1890\n");
146 break;
147 case PHY_DP83840:
148 DPRINTK("PHY is DP83840\n");
149 break;
150 }
151 #endif
152 if(p2!=0xffff&&p2!=0x0000){
153 DPRINTK("PHY code: %x\n",(p2<<12)|(p3>>4));
154 break;
155 }
156 }
157 spin_unlock_irqrestore(&priv->meth_lock, flags);
158 if(priv->phy_addr<32) {
159 return 0;
160 }
161 DPRINTK("Oopsie! PHY is not known!\n");
162 priv->phy_addr=-1;
163 return -ENODEV;
164 }
165
166 static void meth_check_link(struct net_device *dev)
167 {
168 struct meth_private *priv = netdev_priv(dev);
169 unsigned long mii_advertising = mdio_read(priv, 4);
170 unsigned long mii_partner = mdio_read(priv, 5);
171 unsigned long negotiated = mii_advertising & mii_partner;
172 unsigned long duplex, speed;
173
174 if (mii_partner == 0xffff)
175 return;
176
177 speed = (negotiated & 0x0380) ? METH_100MBIT : 0;
178 duplex = ((negotiated & 0x0100) || (negotiated & 0x01C0) == 0x0040) ?
179 METH_PHY_FDX : 0;
180
181 if ((priv->mac_ctrl & METH_PHY_FDX) ^ duplex) {
182 DPRINTK("Setting %s-duplex\n", duplex ? "full" : "half");
183 if (duplex)
184 priv->mac_ctrl |= METH_PHY_FDX;
185 else
186 priv->mac_ctrl &= ~METH_PHY_FDX;
187 mace->eth.mac_ctrl = priv->mac_ctrl;
188 }
189
190 if ((priv->mac_ctrl & METH_100MBIT) ^ speed) {
191 DPRINTK("Setting %dMbs mode\n", speed ? 100 : 10);
192 if (duplex)
193 priv->mac_ctrl |= METH_100MBIT;
194 else
195 priv->mac_ctrl &= ~METH_100MBIT;
196 mace->eth.mac_ctrl = priv->mac_ctrl;
197 }
198 }
199
200
201 static int meth_init_tx_ring(struct meth_private *priv)
202 {
203 /* Init TX ring */
204 priv->tx_ring = dma_alloc_coherent(NULL, TX_RING_BUFFER_SIZE,
205 &priv->tx_ring_dma, GFP_ATOMIC);
206 if (!priv->tx_ring)
207 return -ENOMEM;
208 memset(priv->tx_ring, 0, TX_RING_BUFFER_SIZE);
209 priv->tx_count = priv->tx_read = priv->tx_write = 0;
210 mace->eth.tx_ring_base = priv->tx_ring_dma;
211 /* Now init skb save area */
212 memset(priv->tx_skbs, 0, sizeof(priv->tx_skbs));
213 memset(priv->tx_skb_dmas, 0, sizeof(priv->tx_skb_dmas));
214 return 0;
215 }
216
217 static int meth_init_rx_ring(struct meth_private *priv)
218 {
219 int i;
220
221 for (i = 0; i < RX_RING_ENTRIES; i++) {
222 priv->rx_skbs[i] = alloc_skb(METH_RX_BUFF_SIZE, 0);
223 /* 8byte status vector + 3quad padding + 2byte padding,
224 * to put data on 64bit aligned boundary */
225 skb_reserve(priv->rx_skbs[i],METH_RX_HEAD);
226 priv->rx_ring[i]=(rx_packet*)(priv->rx_skbs[i]->head);
227 /* I'll need to re-sync it after each RX */
228 priv->rx_ring_dmas[i] =
229 dma_map_single(NULL, priv->rx_ring[i],
230 METH_RX_BUFF_SIZE, DMA_FROM_DEVICE);
231 mace->eth.rx_fifo = priv->rx_ring_dmas[i];
232 }
233 priv->rx_write = 0;
234 return 0;
235 }
236 static void meth_free_tx_ring(struct meth_private *priv)
237 {
238 int i;
239
240 /* Remove any pending skb */
241 for (i = 0; i < TX_RING_ENTRIES; i++) {
242 if (priv->tx_skbs[i])
243 dev_kfree_skb(priv->tx_skbs[i]);
244 priv->tx_skbs[i] = NULL;
245 }
246 dma_free_coherent(NULL, TX_RING_BUFFER_SIZE, priv->tx_ring,
247 priv->tx_ring_dma);
248 }
249
250 /* Presumes RX DMA engine is stopped, and RX fifo ring is reset */
251 static void meth_free_rx_ring(struct meth_private *priv)
252 {
253 int i;
254
255 for (i = 0; i < RX_RING_ENTRIES; i++) {
256 dma_unmap_single(NULL, priv->rx_ring_dmas[i],
257 METH_RX_BUFF_SIZE, DMA_FROM_DEVICE);
258 priv->rx_ring[i] = 0;
259 priv->rx_ring_dmas[i] = 0;
260 kfree_skb(priv->rx_skbs[i]);
261 }
262 }
263
264 int meth_reset(struct net_device *dev)
265 {
266 struct meth_private *priv = netdev_priv(dev);
267
268 /* Reset card */
269 mace->eth.mac_ctrl = SGI_MAC_RESET;
270 udelay(1);
271 mace->eth.mac_ctrl = 0;
272 udelay(25);
273
274 /* Load ethernet address */
275 load_eaddr(dev);
276 /* Should load some "errata", but later */
277
278 /* Check for device */
279 if (mdio_probe(priv) < 0) {
280 DPRINTK("Unable to find PHY\n");
281 return -ENODEV;
282 }
283
284 /* Initial mode: 10 | Half-duplex | Accept normal packets */
285 priv->mac_ctrl = METH_ACCEPT_MCAST | METH_DEFAULT_IPG;
286 if (dev->flags & IFF_PROMISC)
287 priv->mac_ctrl |= METH_PROMISC;
288 mace->eth.mac_ctrl = priv->mac_ctrl;
289
290 /* Autonegotiate speed and duplex mode */
291 meth_check_link(dev);
292
293 /* Now set dma control, but don't enable DMA, yet */
294 priv->dma_ctrl = (4 << METH_RX_OFFSET_SHIFT) |
295 (RX_RING_ENTRIES << METH_RX_DEPTH_SHIFT);
296 mace->eth.dma_ctrl = priv->dma_ctrl;
297
298 return 0;
299 }
300
301 /*============End Helper Routines=====================*/
302
303 /*
304 * Open and close
305 */
306 static int meth_open(struct net_device *dev)
307 {
308 struct meth_private *priv = netdev_priv(dev);
309 int ret;
310
311 priv->phy_addr = -1; /* No PHY is known yet... */
312
313 /* Initialize the hardware */
314 ret = meth_reset(dev);
315 if (ret < 0)
316 return ret;
317
318 /* Allocate the ring buffers */
319 ret = meth_init_tx_ring(priv);
320 if (ret < 0)
321 return ret;
322 ret = meth_init_rx_ring(priv);
323 if (ret < 0)
324 goto out_free_tx_ring;
325
326 ret = request_irq(dev->irq, meth_interrupt, 0, meth_str, dev);
327 if (ret) {
328 printk(KERN_ERR "%s: Can't get irq %d\n", dev->name, dev->irq);
329 goto out_free_rx_ring;
330 }
331
332 /* Start DMA */
333 priv->dma_ctrl |= METH_DMA_TX_EN | /*METH_DMA_TX_INT_EN |*/
334 METH_DMA_RX_EN | METH_DMA_RX_INT_EN;
335 mace->eth.dma_ctrl = priv->dma_ctrl;
336
337 DPRINTK("About to start queue\n");
338 netif_start_queue(dev);
339
340 return 0;
341
342 out_free_rx_ring:
343 meth_free_rx_ring(priv);
344 out_free_tx_ring:
345 meth_free_tx_ring(priv);
346
347 return ret;
348 }
349
350 static int meth_release(struct net_device *dev)
351 {
352 struct meth_private *priv = netdev_priv(dev);
353
354 DPRINTK("Stopping queue\n");
355 netif_stop_queue(dev); /* can't transmit any more */
356 /* shut down DMA */
357 priv->dma_ctrl &= ~(METH_DMA_TX_EN | METH_DMA_TX_INT_EN |
358 METH_DMA_RX_EN | METH_DMA_RX_INT_EN);
359 mace->eth.dma_ctrl = priv->dma_ctrl;
360 free_irq(dev->irq, dev);
361 meth_free_tx_ring(priv);
362 meth_free_rx_ring(priv);
363
364 return 0;
365 }
366
367 /*
368 * Receive a packet: retrieve, encapsulate and pass over to upper levels
369 */
370 static void meth_rx(struct net_device* dev, unsigned long int_status)
371 {
372 struct sk_buff *skb;
373 unsigned long status, flags;
374 struct meth_private *priv = netdev_priv(dev);
375 unsigned long fifo_rptr = (int_status & METH_INT_RX_RPTR_MASK) >> 8;
376
377 spin_lock_irqsave(&priv->meth_lock, flags);
378 priv->dma_ctrl &= ~METH_DMA_RX_INT_EN;
379 mace->eth.dma_ctrl = priv->dma_ctrl;
380 spin_unlock_irqrestore(&priv->meth_lock, flags);
381
382 if (int_status & METH_INT_RX_UNDERFLOW) {
383 fifo_rptr = (fifo_rptr - 1) & 0x0f;
384 }
385 while (priv->rx_write != fifo_rptr) {
386 dma_unmap_single(NULL, priv->rx_ring_dmas[priv->rx_write],
387 METH_RX_BUFF_SIZE, DMA_FROM_DEVICE);
388 status = priv->rx_ring[priv->rx_write]->status.raw;
389 #if MFE_DEBUG
390 if (!(status & METH_RX_ST_VALID)) {
391 DPRINTK("Not received? status=%016lx\n",status);
392 }
393 #endif
394 if ((!(status & METH_RX_STATUS_ERRORS)) && (status & METH_RX_ST_VALID)) {
395 int len = (status & 0xffff) - 4; /* omit CRC */
396 /* length sanity check */
397 if (len < 60 || len > 1518) {
398 printk(KERN_DEBUG "%s: bogus packet size: %ld, status=%#2Lx.\n",
399 dev->name, priv->rx_write,
400 priv->rx_ring[priv->rx_write]->status.raw);
401 dev->stats.rx_errors++;
402 dev->stats.rx_length_errors++;
403 skb = priv->rx_skbs[priv->rx_write];
404 } else {
405 skb = alloc_skb(METH_RX_BUFF_SIZE, GFP_ATOMIC);
406 if (!skb) {
407 /* Ouch! No memory! Drop packet on the floor */
408 DPRINTK("No mem: dropping packet\n");
409 dev->stats.rx_dropped++;
410 skb = priv->rx_skbs[priv->rx_write];
411 } else {
412 struct sk_buff *skb_c = priv->rx_skbs[priv->rx_write];
413 /* 8byte status vector + 3quad padding + 2byte padding,
414 * to put data on 64bit aligned boundary */
415 skb_reserve(skb, METH_RX_HEAD);
416 /* Write metadata, and then pass to the receive level */
417 skb_put(skb_c, len);
418 priv->rx_skbs[priv->rx_write] = skb;
419 skb_c->protocol = eth_type_trans(skb_c, dev);
420 dev->stats.rx_packets++;
421 dev->stats.rx_bytes += len;
422 netif_rx(skb_c);
423 }
424 }
425 } else {
426 dev->stats.rx_errors++;
427 skb=priv->rx_skbs[priv->rx_write];
428 #if MFE_DEBUG>0
429 printk(KERN_WARNING "meth: RX error: status=0x%016lx\n",status);
430 if(status&METH_RX_ST_RCV_CODE_VIOLATION)
431 printk(KERN_WARNING "Receive Code Violation\n");
432 if(status&METH_RX_ST_CRC_ERR)
433 printk(KERN_WARNING "CRC error\n");
434 if(status&METH_RX_ST_INV_PREAMBLE_CTX)
435 printk(KERN_WARNING "Invalid Preamble Context\n");
436 if(status&METH_RX_ST_LONG_EVT_SEEN)
437 printk(KERN_WARNING "Long Event Seen...\n");
438 if(status&METH_RX_ST_BAD_PACKET)
439 printk(KERN_WARNING "Bad Packet\n");
440 if(status&METH_RX_ST_CARRIER_EVT_SEEN)
441 printk(KERN_WARNING "Carrier Event Seen\n");
442 #endif
443 }
444 priv->rx_ring[priv->rx_write] = (rx_packet*)skb->head;
445 priv->rx_ring[priv->rx_write]->status.raw = 0;
446 priv->rx_ring_dmas[priv->rx_write] =
447 dma_map_single(NULL, priv->rx_ring[priv->rx_write],
448 METH_RX_BUFF_SIZE, DMA_FROM_DEVICE);
449 mace->eth.rx_fifo = priv->rx_ring_dmas[priv->rx_write];
450 ADVANCE_RX_PTR(priv->rx_write);
451 }
452 spin_lock_irqsave(&priv->meth_lock, flags);
453 /* In case there was underflow, and Rx DMA was disabled */
454 priv->dma_ctrl |= METH_DMA_RX_INT_EN | METH_DMA_RX_EN;
455 mace->eth.dma_ctrl = priv->dma_ctrl;
456 mace->eth.int_stat = METH_INT_RX_THRESHOLD;
457 spin_unlock_irqrestore(&priv->meth_lock, flags);
458 }
459
460 static int meth_tx_full(struct net_device *dev)
461 {
462 struct meth_private *priv = netdev_priv(dev);
463
464 return (priv->tx_count >= TX_RING_ENTRIES - 1);
465 }
466
467 static void meth_tx_cleanup(struct net_device* dev, unsigned long int_status)
468 {
469 struct meth_private *priv = netdev_priv(dev);
470 unsigned long status, flags;
471 struct sk_buff *skb;
472 unsigned long rptr = (int_status&TX_INFO_RPTR) >> 16;
473
474 spin_lock_irqsave(&priv->meth_lock, flags);
475
476 /* Stop DMA notification */
477 priv->dma_ctrl &= ~(METH_DMA_TX_INT_EN);
478 mace->eth.dma_ctrl = priv->dma_ctrl;
479
480 while (priv->tx_read != rptr) {
481 skb = priv->tx_skbs[priv->tx_read];
482 status = priv->tx_ring[priv->tx_read].header.raw;
483 #if MFE_DEBUG>=1
484 if (priv->tx_read == priv->tx_write)
485 DPRINTK("Auchi! tx_read=%d,tx_write=%d,rptr=%d?\n", priv->tx_read, priv->tx_write,rptr);
486 #endif
487 if (status & METH_TX_ST_DONE) {
488 if (status & METH_TX_ST_SUCCESS){
489 dev->stats.tx_packets++;
490 dev->stats.tx_bytes += skb->len;
491 } else {
492 dev->stats.tx_errors++;
493 #if MFE_DEBUG>=1
494 DPRINTK("TX error: status=%016lx <",status);
495 if(status & METH_TX_ST_SUCCESS)
496 printk(" SUCCESS");
497 if(status & METH_TX_ST_TOOLONG)
498 printk(" TOOLONG");
499 if(status & METH_TX_ST_UNDERRUN)
500 printk(" UNDERRUN");
501 if(status & METH_TX_ST_EXCCOLL)
502 printk(" EXCCOLL");
503 if(status & METH_TX_ST_DEFER)
504 printk(" DEFER");
505 if(status & METH_TX_ST_LATECOLL)
506 printk(" LATECOLL");
507 printk(" >\n");
508 #endif
509 }
510 } else {
511 DPRINTK("RPTR points us here, but packet not done?\n");
512 break;
513 }
514 dev_kfree_skb_irq(skb);
515 priv->tx_skbs[priv->tx_read] = NULL;
516 priv->tx_ring[priv->tx_read].header.raw = 0;
517 priv->tx_read = (priv->tx_read+1)&(TX_RING_ENTRIES-1);
518 priv->tx_count--;
519 }
520
521 /* wake up queue if it was stopped */
522 if (netif_queue_stopped(dev) && !meth_tx_full(dev)) {
523 netif_wake_queue(dev);
524 }
525
526 mace->eth.int_stat = METH_INT_TX_EMPTY | METH_INT_TX_PKT;
527 spin_unlock_irqrestore(&priv->meth_lock, flags);
528 }
529
530 static void meth_error(struct net_device* dev, unsigned status)
531 {
532 struct meth_private *priv = netdev_priv(dev);
533 unsigned long flags;
534
535 printk(KERN_WARNING "meth: error status: 0x%08x\n",status);
536 /* check for errors too... */
537 if (status & (METH_INT_TX_LINK_FAIL))
538 printk(KERN_WARNING "meth: link failure\n");
539 /* Should I do full reset in this case? */
540 if (status & (METH_INT_MEM_ERROR))
541 printk(KERN_WARNING "meth: memory error\n");
542 if (status & (METH_INT_TX_ABORT))
543 printk(KERN_WARNING "meth: aborted\n");
544 if (status & (METH_INT_RX_OVERFLOW))
545 printk(KERN_WARNING "meth: Rx overflow\n");
546 if (status & (METH_INT_RX_UNDERFLOW)) {
547 printk(KERN_WARNING "meth: Rx underflow\n");
548 spin_lock_irqsave(&priv->meth_lock, flags);
549 mace->eth.int_stat = METH_INT_RX_UNDERFLOW;
550 /* more underflow interrupts will be delivered,
551 * effectively throwing us into an infinite loop.
552 * Thus I stop processing Rx in this case. */
553 priv->dma_ctrl &= ~METH_DMA_RX_EN;
554 mace->eth.dma_ctrl = priv->dma_ctrl;
555 DPRINTK("Disabled meth Rx DMA temporarily\n");
556 spin_unlock_irqrestore(&priv->meth_lock, flags);
557 }
558 mace->eth.int_stat = METH_INT_ERROR;
559 }
560
561 /*
562 * The typical interrupt entry point
563 */
564 static irqreturn_t meth_interrupt(int irq, void *dev_id)
565 {
566 struct net_device *dev = (struct net_device *)dev_id;
567 struct meth_private *priv = netdev_priv(dev);
568 unsigned long status;
569
570 status = mace->eth.int_stat;
571 while (status & 0xff) {
572 /* First handle errors - if we get Rx underflow,
573 * Rx DMA will be disabled, and Rx handler will reenable
574 * it. I don't think it's possible to get Rx underflow,
575 * without getting Rx interrupt */
576 if (status & METH_INT_ERROR) {
577 meth_error(dev, status);
578 }
579 if (status & (METH_INT_TX_EMPTY | METH_INT_TX_PKT)) {
580 /* a transmission is over: free the skb */
581 meth_tx_cleanup(dev, status);
582 }
583 if (status & METH_INT_RX_THRESHOLD) {
584 if (!(priv->dma_ctrl & METH_DMA_RX_INT_EN))
585 break;
586 /* send it to meth_rx for handling */
587 meth_rx(dev, status);
588 }
589 status = mace->eth.int_stat;
590 }
591
592 return IRQ_HANDLED;
593 }
594
595 /*
596 * Transmits packets that fit into TX descriptor (are <=120B)
597 */
598 static void meth_tx_short_prepare(struct meth_private *priv,
599 struct sk_buff *skb)
600 {
601 tx_packet *desc = &priv->tx_ring[priv->tx_write];
602 int len = (skb->len < ETH_ZLEN) ? ETH_ZLEN : skb->len;
603
604 desc->header.raw = METH_TX_CMD_INT_EN | (len-1) | ((128-len) << 16);
605 /* maybe I should set whole thing to 0 first... */
606 skb_copy_from_linear_data(skb, desc->data.dt + (120 - len), skb->len);
607 if (skb->len < len)
608 memset(desc->data.dt + 120 - len + skb->len, 0, len-skb->len);
609 }
610 #define TX_CATBUF1 BIT(25)
611 static void meth_tx_1page_prepare(struct meth_private *priv,
612 struct sk_buff *skb)
613 {
614 tx_packet *desc = &priv->tx_ring[priv->tx_write];
615 void *buffer_data = (void *)(((unsigned long)skb->data + 7) & ~7);
616 int unaligned_len = (int)((unsigned long)buffer_data - (unsigned long)skb->data);
617 int buffer_len = skb->len - unaligned_len;
618 dma_addr_t catbuf;
619
620 desc->header.raw = METH_TX_CMD_INT_EN | TX_CATBUF1 | (skb->len - 1);
621
622 /* unaligned part */
623 if (unaligned_len) {
624 skb_copy_from_linear_data(skb, desc->data.dt + (120 - unaligned_len),
625 unaligned_len);
626 desc->header.raw |= (128 - unaligned_len) << 16;
627 }
628
629 /* first page */
630 catbuf = dma_map_single(NULL, buffer_data, buffer_len,
631 DMA_TO_DEVICE);
632 desc->data.cat_buf[0].form.start_addr = catbuf >> 3;
633 desc->data.cat_buf[0].form.len = buffer_len - 1;
634 }
635 #define TX_CATBUF2 BIT(26)
636 static void meth_tx_2page_prepare(struct meth_private *priv,
637 struct sk_buff *skb)
638 {
639 tx_packet *desc = &priv->tx_ring[priv->tx_write];
640 void *buffer1_data = (void *)(((unsigned long)skb->data + 7) & ~7);
641 void *buffer2_data = (void *)PAGE_ALIGN((unsigned long)skb->data);
642 int unaligned_len = (int)((unsigned long)buffer1_data - (unsigned long)skb->data);
643 int buffer1_len = (int)((unsigned long)buffer2_data - (unsigned long)buffer1_data);
644 int buffer2_len = skb->len - buffer1_len - unaligned_len;
645 dma_addr_t catbuf1, catbuf2;
646
647 desc->header.raw = METH_TX_CMD_INT_EN | TX_CATBUF1 | TX_CATBUF2| (skb->len - 1);
648 /* unaligned part */
649 if (unaligned_len){
650 skb_copy_from_linear_data(skb, desc->data.dt + (120 - unaligned_len),
651 unaligned_len);
652 desc->header.raw |= (128 - unaligned_len) << 16;
653 }
654
655 /* first page */
656 catbuf1 = dma_map_single(NULL, buffer1_data, buffer1_len,
657 DMA_TO_DEVICE);
658 desc->data.cat_buf[0].form.start_addr = catbuf1 >> 3;
659 desc->data.cat_buf[0].form.len = buffer1_len - 1;
660 /* second page */
661 catbuf2 = dma_map_single(NULL, buffer2_data, buffer2_len,
662 DMA_TO_DEVICE);
663 desc->data.cat_buf[1].form.start_addr = catbuf2 >> 3;
664 desc->data.cat_buf[1].form.len = buffer2_len - 1;
665 }
666
667 static void meth_add_to_tx_ring(struct meth_private *priv, struct sk_buff *skb)
668 {
669 /* Remember the skb, so we can free it at interrupt time */
670 priv->tx_skbs[priv->tx_write] = skb;
671 if (skb->len <= 120) {
672 /* Whole packet fits into descriptor */
673 meth_tx_short_prepare(priv, skb);
674 } else if (PAGE_ALIGN((unsigned long)skb->data) !=
675 PAGE_ALIGN((unsigned long)skb->data + skb->len - 1)) {
676 /* Packet crosses page boundary */
677 meth_tx_2page_prepare(priv, skb);
678 } else {
679 /* Packet is in one page */
680 meth_tx_1page_prepare(priv, skb);
681 }
682 priv->tx_write = (priv->tx_write + 1) & (TX_RING_ENTRIES - 1);
683 mace->eth.tx_info = priv->tx_write;
684 priv->tx_count++;
685 }
686
687 /*
688 * Transmit a packet (called by the kernel)
689 */
690 static int meth_tx(struct sk_buff *skb, struct net_device *dev)
691 {
692 struct meth_private *priv = netdev_priv(dev);
693 unsigned long flags;
694
695 spin_lock_irqsave(&priv->meth_lock, flags);
696 /* Stop DMA notification */
697 priv->dma_ctrl &= ~(METH_DMA_TX_INT_EN);
698 mace->eth.dma_ctrl = priv->dma_ctrl;
699
700 meth_add_to_tx_ring(priv, skb);
701 dev->trans_start = jiffies; /* save the timestamp */
702
703 /* If TX ring is full, tell the upper layer to stop sending packets */
704 if (meth_tx_full(dev)) {
705 printk(KERN_DEBUG "TX full: stopping\n");
706 netif_stop_queue(dev);
707 }
708
709 /* Restart DMA notification */
710 priv->dma_ctrl |= METH_DMA_TX_INT_EN;
711 mace->eth.dma_ctrl = priv->dma_ctrl;
712
713 spin_unlock_irqrestore(&priv->meth_lock, flags);
714
715 return NETDEV_TX_OK;
716 }
717
718 /*
719 * Deal with a transmit timeout.
720 */
721 static void meth_tx_timeout(struct net_device *dev)
722 {
723 struct meth_private *priv = netdev_priv(dev);
724 unsigned long flags;
725
726 printk(KERN_WARNING "%s: transmit timed out\n", dev->name);
727
728 /* Protect against concurrent rx interrupts */
729 spin_lock_irqsave(&priv->meth_lock,flags);
730
731 /* Try to reset the interface. */
732 meth_reset(dev);
733
734 dev->stats.tx_errors++;
735
736 /* Clear all rings */
737 meth_free_tx_ring(priv);
738 meth_free_rx_ring(priv);
739 meth_init_tx_ring(priv);
740 meth_init_rx_ring(priv);
741
742 /* Restart dma */
743 priv->dma_ctrl |= METH_DMA_TX_EN | METH_DMA_RX_EN | METH_DMA_RX_INT_EN;
744 mace->eth.dma_ctrl = priv->dma_ctrl;
745
746 /* Enable interrupt */
747 spin_unlock_irqrestore(&priv->meth_lock, flags);
748
749 dev->trans_start = jiffies;
750 netif_wake_queue(dev);
751
752 return;
753 }
754
755 /*
756 * Ioctl commands
757 */
758 static int meth_ioctl(struct net_device *dev, struct ifreq *rq, int cmd)
759 {
760 /* XXX Not yet implemented */
761 switch(cmd) {
762 case SIOCGMIIPHY:
763 case SIOCGMIIREG:
764 case SIOCSMIIREG:
765 default:
766 return -EOPNOTSUPP;
767 }
768 }
769
770 static const struct net_device_ops meth_netdev_ops = {
771 .ndo_open = meth_open,
772 .ndo_stop = meth_release,
773 .ndo_start_xmit = meth_tx,
774 .ndo_do_ioctl = meth_ioctl,
775 .ndo_tx_timeout = meth_tx_timeout,
776 .ndo_change_mtu = eth_change_mtu,
777 .ndo_validate_addr = eth_validate_addr,
778 .ndo_set_mac_address = eth_mac_addr,
779 };
780
781 /*
782 * The init function.
783 */
784 static int __devinit meth_probe(struct platform_device *pdev)
785 {
786 struct net_device *dev;
787 struct meth_private *priv;
788 int err;
789
790 dev = alloc_etherdev(sizeof(struct meth_private));
791 if (!dev)
792 return -ENOMEM;
793
794 dev->netdev_ops = &meth_netdev_ops;
795 dev->watchdog_timeo = timeout;
796 dev->irq = MACE_ETHERNET_IRQ;
797 dev->base_addr = (unsigned long)&mace->eth;
798 memcpy(dev->dev_addr, o2meth_eaddr, 6);
799
800 priv = netdev_priv(dev);
801 spin_lock_init(&priv->meth_lock);
802 SET_NETDEV_DEV(dev, &pdev->dev);
803
804 err = register_netdev(dev);
805 if (err) {
806 free_netdev(dev);
807 return err;
808 }
809
810 printk(KERN_INFO "%s: SGI MACE Ethernet rev. %d\n",
811 dev->name, (unsigned int)(mace->eth.mac_ctrl >> 29));
812 return 0;
813 }
814
815 static int __exit meth_remove(struct platform_device *pdev)
816 {
817 struct net_device *dev = platform_get_drvdata(pdev);
818
819 unregister_netdev(dev);
820 free_netdev(dev);
821 platform_set_drvdata(pdev, NULL);
822
823 return 0;
824 }
825
826 static struct platform_driver meth_driver = {
827 .probe = meth_probe,
828 .remove = __exit_p(meth_remove),
829 .driver = {
830 .name = "meth",
831 .owner = THIS_MODULE,
832 }
833 };
834
835 static int __init meth_init_module(void)
836 {
837 int err;
838
839 err = platform_driver_register(&meth_driver);
840 if (err)
841 printk(KERN_ERR "Driver registration failed\n");
842
843 return err;
844 }
845
846 static void __exit meth_exit_module(void)
847 {
848 platform_driver_unregister(&meth_driver);
849 }
850
851 module_init(meth_init_module);
852 module_exit(meth_exit_module);
853
854 MODULE_AUTHOR("Ilya Volynets <ilya@theIlya.com>");
855 MODULE_DESCRIPTION("SGI O2 Builtin Fast Ethernet driver");
856 MODULE_LICENSE("GPL");
857 MODULE_ALIAS("platform:meth");
Linux with added FPC-III support