1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * meth.c -- O2 Builtin 10/100 Ethernet driver
4 *
5 * Copyright (C) 2001-2003 Ilya Volynets
6 */
7 #include <linux/delay.h>
8 #include <linux/dma-mapping.h>
9 #include <linux/kernel.h>
10 #include <linux/module.h>
11 #include <linux/platform_device.h>
12 #include <linux/slab.h>
13 #include <linux/errno.h>
14 #include <linux/types.h>
15 #include <linux/interrupt.h>
16
17 #include <linux/in.h>
18 #include <linux/in6.h>
19 #include <linux/device.h> /* struct device, et al */
20 #include <linux/netdevice.h> /* struct device, and other headers */
21 #include <linux/etherdevice.h> /* eth_type_trans */
22 #include <linux/ip.h> /* struct iphdr */
23 #include <linux/tcp.h> /* struct tcphdr */
24 #include <linux/skbuff.h>
25 #include <linux/mii.h> /* MII definitions */
26 #include <linux/crc32.h>
27
28 #include <asm/ip32/mace.h>
29 #include <asm/ip32/ip32_ints.h>
30
31 #include <asm/io.h>
32
33 #include "meth.h"
34
35 #ifndef MFE_DEBUG
36 #define MFE_DEBUG 0
37 #endif
38
39 #if MFE_DEBUG>=1
40 #define DPRINTK(str,args...) printk(KERN_DEBUG "meth: %s: " str, __func__ , ## args)
41 #define MFE_RX_DEBUG 2
42 #else
43 #define DPRINTK(str,args...)
44 #define MFE_RX_DEBUG 0
45 #endif
46
47
48 static const char *meth_str="SGI O2 Fast Ethernet";
49
50 /* The maximum time waited (in jiffies) before assuming a Tx failed. (400ms) */
51 #define TX_TIMEOUT (400*HZ/1000)
52
53 static int timeout = TX_TIMEOUT;
54 module_param(timeout, int, 0);
55
56 /*
57 * Maximum number of multicast addresses to filter (vs. Rx-all-multicast).
58 * MACE Ethernet uses a 64 element hash table based on the Ethernet CRC.
59 */
60 #define METH_MCF_LIMIT 32
61
62 /*
63 * This structure is private to each device. It is used to pass
64 * packets in and out, so there is place for a packet
65 */
66 struct meth_private {
67 struct platform_device *pdev;
68
69 /* in-memory copy of MAC Control register */
70 u64 mac_ctrl;
71
72 /* in-memory copy of DMA Control register */
73 unsigned long dma_ctrl;
74 /* address of PHY, used by mdio_* functions, initialized in mdio_probe */
75 unsigned long phy_addr;
76 tx_packet *tx_ring;
77 dma_addr_t tx_ring_dma;
78 struct sk_buff *tx_skbs[TX_RING_ENTRIES];
79 dma_addr_t tx_skb_dmas[TX_RING_ENTRIES];
80 unsigned long tx_read, tx_write, tx_count;
81
82 rx_packet *rx_ring[RX_RING_ENTRIES];
83 dma_addr_t rx_ring_dmas[RX_RING_ENTRIES];
84 struct sk_buff *rx_skbs[RX_RING_ENTRIES];
85 unsigned long rx_write;
86
87 /* Multicast filter. */
88 u64 mcast_filter;
89
90 spinlock_t meth_lock;
91 };
92
93 static void meth_tx_timeout(struct net_device *dev, unsigned int txqueue);
94 static irqreturn_t meth_interrupt(int irq, void *dev_id);
95
96 /* global, initialized in ip32-setup.c */
97 char o2meth_eaddr[8]={0,0,0,0,0,0,0,0};
98
load_eaddr(struct net_device * dev)99 static inline void load_eaddr(struct net_device *dev)
100 {
101 int i;
102 u64 macaddr;
103
104 DPRINTK("Loading MAC Address: %pM\n", dev->dev_addr);
105 macaddr = 0;
106 for (i = 0; i < 6; i++)
107 macaddr |= (u64)dev->dev_addr[i] << ((5 - i) * 8);
108
109 mace->eth.mac_addr = macaddr;
110 }
111
112 /*
113 * Waits for BUSY status of mdio bus to clear
114 */
115 #define WAIT_FOR_PHY(___rval) \
116 while ((___rval = mace->eth.phy_data) & MDIO_BUSY) { \
117 udelay(25); \
118 }
119 /*read phy register, return value read */
mdio_read(struct meth_private * priv,unsigned long phyreg)120 static unsigned long mdio_read(struct meth_private *priv, unsigned long phyreg)
121 {
122 unsigned long rval;
123 WAIT_FOR_PHY(rval);
124 mace->eth.phy_regs = (priv->phy_addr << 5) | (phyreg & 0x1f);
125 udelay(25);
126 mace->eth.phy_trans_go = 1;
127 udelay(25);
128 WAIT_FOR_PHY(rval);
129 return rval & MDIO_DATA_MASK;
130 }
131
mdio_probe(struct meth_private * priv)132 static int mdio_probe(struct meth_private *priv)
133 {
134 int i;
135 unsigned long p2, p3, flags;
136 /* check if phy is detected already */
137 if(priv->phy_addr>=0&&priv->phy_addr<32)
138 return 0;
139 spin_lock_irqsave(&priv->meth_lock, flags);
140 for (i=0;i<32;++i){
141 priv->phy_addr=i;
142 p2=mdio_read(priv,2);
143 p3=mdio_read(priv,3);
144 #if MFE_DEBUG>=2
145 switch ((p2<<12)|(p3>>4)){
146 case PHY_QS6612X:
147 DPRINTK("PHY is QS6612X\n");
148 break;
149 case PHY_ICS1889:
150 DPRINTK("PHY is ICS1889\n");
151 break;
152 case PHY_ICS1890:
153 DPRINTK("PHY is ICS1890\n");
154 break;
155 case PHY_DP83840:
156 DPRINTK("PHY is DP83840\n");
157 break;
158 }
159 #endif
160 if(p2!=0xffff&&p2!=0x0000){
161 DPRINTK("PHY code: %x\n",(p2<<12)|(p3>>4));
162 break;
163 }
164 }
165 spin_unlock_irqrestore(&priv->meth_lock, flags);
166 if(priv->phy_addr<32) {
167 return 0;
168 }
169 DPRINTK("Oopsie! PHY is not known!\n");
170 priv->phy_addr=-1;
171 return -ENODEV;
172 }
173
meth_check_link(struct net_device * dev)174 static void meth_check_link(struct net_device *dev)
175 {
176 struct meth_private *priv = netdev_priv(dev);
177 unsigned long mii_advertising = mdio_read(priv, 4);
178 unsigned long mii_partner = mdio_read(priv, 5);
179 unsigned long negotiated = mii_advertising & mii_partner;
180 unsigned long duplex, speed;
181
182 if (mii_partner == 0xffff)
183 return;
184
185 speed = (negotiated & 0x0380) ? METH_100MBIT : 0;
186 duplex = ((negotiated & 0x0100) || (negotiated & 0x01C0) == 0x0040) ?
187 METH_PHY_FDX : 0;
188
189 if ((priv->mac_ctrl & METH_PHY_FDX) ^ duplex) {
190 DPRINTK("Setting %s-duplex\n", duplex ? "full" : "half");
191 if (duplex)
192 priv->mac_ctrl |= METH_PHY_FDX;
193 else
194 priv->mac_ctrl &= ~METH_PHY_FDX;
195 mace->eth.mac_ctrl = priv->mac_ctrl;
196 }
197
198 if ((priv->mac_ctrl & METH_100MBIT) ^ speed) {
199 DPRINTK("Setting %dMbs mode\n", speed ? 100 : 10);
200 if (duplex)
201 priv->mac_ctrl |= METH_100MBIT;
202 else
203 priv->mac_ctrl &= ~METH_100MBIT;
204 mace->eth.mac_ctrl = priv->mac_ctrl;
205 }
206 }
207
208
meth_init_tx_ring(struct meth_private * priv)209 static int meth_init_tx_ring(struct meth_private *priv)
210 {
211 /* Init TX ring */
212 priv->tx_ring = dma_alloc_coherent(&priv->pdev->dev,
213 TX_RING_BUFFER_SIZE, &priv->tx_ring_dma, GFP_ATOMIC);
214 if (!priv->tx_ring)
215 return -ENOMEM;
216
217 priv->tx_count = priv->tx_read = priv->tx_write = 0;
218 mace->eth.tx_ring_base = priv->tx_ring_dma;
219 /* Now init skb save area */
220 memset(priv->tx_skbs, 0, sizeof(priv->tx_skbs));
221 memset(priv->tx_skb_dmas, 0, sizeof(priv->tx_skb_dmas));
222 return 0;
223 }
224
meth_init_rx_ring(struct meth_private * priv)225 static int meth_init_rx_ring(struct meth_private *priv)
226 {
227 int i;
228
229 for (i = 0; i < RX_RING_ENTRIES; i++) {
230 priv->rx_skbs[i] = alloc_skb(METH_RX_BUFF_SIZE, 0);
231 /* 8byte status vector + 3quad padding + 2byte padding,
232 * to put data on 64bit aligned boundary */
233 skb_reserve(priv->rx_skbs[i],METH_RX_HEAD);
234 priv->rx_ring[i]=(rx_packet*)(priv->rx_skbs[i]->head);
235 /* I'll need to re-sync it after each RX */
236 priv->rx_ring_dmas[i] =
237 dma_map_single(&priv->pdev->dev, priv->rx_ring[i],
238 METH_RX_BUFF_SIZE, DMA_FROM_DEVICE);
239 mace->eth.rx_fifo = priv->rx_ring_dmas[i];
240 }
241 priv->rx_write = 0;
242 return 0;
243 }
meth_free_tx_ring(struct meth_private * priv)244 static void meth_free_tx_ring(struct meth_private *priv)
245 {
246 int i;
247
248 /* Remove any pending skb */
249 for (i = 0; i < TX_RING_ENTRIES; i++) {
250 dev_kfree_skb(priv->tx_skbs[i]);
251 priv->tx_skbs[i] = NULL;
252 }
253 dma_free_coherent(&priv->pdev->dev, 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 */
meth_free_rx_ring(struct meth_private * priv)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(&priv->pdev->dev, 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
meth_reset(struct net_device * dev)271 int meth_reset(struct net_device *dev)
272 {
273 struct meth_private *priv = netdev_priv(dev);
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 */
meth_open(struct net_device * dev)313 static int meth_open(struct net_device *dev)
314 {
315 struct meth_private *priv = netdev_priv(dev);
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
meth_release(struct net_device * dev)357 static int meth_release(struct net_device *dev)
358 {
359 struct meth_private *priv = netdev_priv(dev);
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 */
meth_rx(struct net_device * dev,unsigned long int_status)377 static void meth_rx(struct net_device* dev, unsigned long int_status)
378 {
379 struct sk_buff *skb;
380 unsigned long status, flags;
381 struct meth_private *priv = netdev_priv(dev);
382 unsigned long fifo_rptr = (int_status & METH_INT_RX_RPTR_MASK) >> 8;
383
384 spin_lock_irqsave(&priv->meth_lock, flags);
385 priv->dma_ctrl &= ~METH_DMA_RX_INT_EN;
386 mace->eth.dma_ctrl = priv->dma_ctrl;
387 spin_unlock_irqrestore(&priv->meth_lock, flags);
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(&priv->pdev->dev,
394 priv->rx_ring_dmas[priv->rx_write],
395 METH_RX_BUFF_SIZE, DMA_FROM_DEVICE);
396 status = priv->rx_ring[priv->rx_write]->status.raw;
397 #if MFE_DEBUG
398 if (!(status & METH_RX_ST_VALID)) {
399 DPRINTK("Not received? status=%016lx\n",status);
400 }
401 #endif
402 if ((!(status & METH_RX_STATUS_ERRORS)) && (status & METH_RX_ST_VALID)) {
403 int len = (status & 0xffff) - 4; /* omit CRC */
404 /* length sanity check */
405 if (len < 60 || len > 1518) {
406 printk(KERN_DEBUG "%s: bogus packet size: %ld, status=%#2Lx.\n",
407 dev->name, priv->rx_write,
408 priv->rx_ring[priv->rx_write]->status.raw);
409 dev->stats.rx_errors++;
410 dev->stats.rx_length_errors++;
411 skb = priv->rx_skbs[priv->rx_write];
412 } else {
413 skb = alloc_skb(METH_RX_BUFF_SIZE, GFP_ATOMIC);
414 if (!skb) {
415 /* Ouch! No memory! Drop packet on the floor */
416 DPRINTK("No mem: dropping packet\n");
417 dev->stats.rx_dropped++;
418 skb = priv->rx_skbs[priv->rx_write];
419 } else {
420 struct sk_buff *skb_c = priv->rx_skbs[priv->rx_write];
421 /* 8byte status vector + 3quad padding + 2byte padding,
422 * to put data on 64bit aligned boundary */
423 skb_reserve(skb, METH_RX_HEAD);
424 /* Write metadata, and then pass to the receive level */
425 skb_put(skb_c, len);
426 priv->rx_skbs[priv->rx_write] = skb;
427 skb_c->protocol = eth_type_trans(skb_c, dev);
428 dev->stats.rx_packets++;
429 dev->stats.rx_bytes += len;
430 netif_rx(skb_c);
431 }
432 }
433 } else {
434 dev->stats.rx_errors++;
435 skb=priv->rx_skbs[priv->rx_write];
436 #if MFE_DEBUG>0
437 printk(KERN_WARNING "meth: RX error: status=0x%016lx\n",status);
438 if(status&METH_RX_ST_RCV_CODE_VIOLATION)
439 printk(KERN_WARNING "Receive Code Violation\n");
440 if(status&METH_RX_ST_CRC_ERR)
441 printk(KERN_WARNING "CRC error\n");
442 if(status&METH_RX_ST_INV_PREAMBLE_CTX)
443 printk(KERN_WARNING "Invalid Preamble Context\n");
444 if(status&METH_RX_ST_LONG_EVT_SEEN)
445 printk(KERN_WARNING "Long Event Seen...\n");
446 if(status&METH_RX_ST_BAD_PACKET)
447 printk(KERN_WARNING "Bad Packet\n");
448 if(status&METH_RX_ST_CARRIER_EVT_SEEN)
449 printk(KERN_WARNING "Carrier Event Seen\n");
450 #endif
451 }
452 priv->rx_ring[priv->rx_write] = (rx_packet*)skb->head;
453 priv->rx_ring[priv->rx_write]->status.raw = 0;
454 priv->rx_ring_dmas[priv->rx_write] =
455 dma_map_single(&priv->pdev->dev,
456 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_irqsave(&priv->meth_lock, flags);
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_irqrestore(&priv->meth_lock, flags);
467 }
468
meth_tx_full(struct net_device * dev)469 static int meth_tx_full(struct net_device *dev)
470 {
471 struct meth_private *priv = netdev_priv(dev);
472
473 return priv->tx_count >= TX_RING_ENTRIES - 1;
474 }
475
meth_tx_cleanup(struct net_device * dev,unsigned long int_status)476 static void meth_tx_cleanup(struct net_device* dev, unsigned long int_status)
477 {
478 struct meth_private *priv = netdev_priv(dev);
479 unsigned long status, flags;
480 struct sk_buff *skb;
481 unsigned long rptr = (int_status&TX_INFO_RPTR) >> 16;
482
483 spin_lock_irqsave(&priv->meth_lock, flags);
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 dev->stats.tx_packets++;
499 dev->stats.tx_bytes += skb->len;
500 } else {
501 dev->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_consume_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_irqrestore(&priv->meth_lock, flags);
537 }
538
meth_error(struct net_device * dev,unsigned status)539 static void meth_error(struct net_device* dev, unsigned status)
540 {
541 struct meth_private *priv = netdev_priv(dev);
542 unsigned long flags;
543
544 printk(KERN_WARNING "meth: error status: 0x%08x\n",status);
545 /* check for errors too... */
546 if (status & (METH_INT_TX_LINK_FAIL))
547 printk(KERN_WARNING "meth: link failure\n");
548 /* Should I do full reset in this case? */
549 if (status & (METH_INT_MEM_ERROR))
550 printk(KERN_WARNING "meth: memory error\n");
551 if (status & (METH_INT_TX_ABORT))
552 printk(KERN_WARNING "meth: aborted\n");
553 if (status & (METH_INT_RX_OVERFLOW))
554 printk(KERN_WARNING "meth: Rx overflow\n");
555 if (status & (METH_INT_RX_UNDERFLOW)) {
556 printk(KERN_WARNING "meth: Rx underflow\n");
557 spin_lock_irqsave(&priv->meth_lock, flags);
558 mace->eth.int_stat = METH_INT_RX_UNDERFLOW;
559 /* more underflow interrupts will be delivered,
560 * effectively throwing us into an infinite loop.
561 * Thus I stop processing Rx in this case. */
562 priv->dma_ctrl &= ~METH_DMA_RX_EN;
563 mace->eth.dma_ctrl = priv->dma_ctrl;
564 DPRINTK("Disabled meth Rx DMA temporarily\n");
565 spin_unlock_irqrestore(&priv->meth_lock, flags);
566 }
567 mace->eth.int_stat = METH_INT_ERROR;
568 }
569
570 /*
571 * The typical interrupt entry point
572 */
meth_interrupt(int irq,void * dev_id)573 static irqreturn_t meth_interrupt(int irq, void *dev_id)
574 {
575 struct net_device *dev = (struct net_device *)dev_id;
576 struct meth_private *priv = netdev_priv(dev);
577 unsigned long status;
578
579 status = mace->eth.int_stat;
580 while (status & 0xff) {
581 /* First handle errors - if we get Rx underflow,
582 * Rx DMA will be disabled, and Rx handler will reenable
583 * it. I don't think it's possible to get Rx underflow,
584 * without getting Rx interrupt */
585 if (status & METH_INT_ERROR) {
586 meth_error(dev, status);
587 }
588 if (status & (METH_INT_TX_EMPTY | METH_INT_TX_PKT)) {
589 /* a transmission is over: free the skb */
590 meth_tx_cleanup(dev, status);
591 }
592 if (status & METH_INT_RX_THRESHOLD) {
593 if (!(priv->dma_ctrl & METH_DMA_RX_INT_EN))
594 break;
595 /* send it to meth_rx for handling */
596 meth_rx(dev, status);
597 }
598 status = mace->eth.int_stat;
599 }
600
601 return IRQ_HANDLED;
602 }
603
604 /*
605 * Transmits packets that fit into TX descriptor (are <=120B)
606 */
meth_tx_short_prepare(struct meth_private * priv,struct sk_buff * skb)607 static void meth_tx_short_prepare(struct meth_private *priv,
608 struct sk_buff *skb)
609 {
610 tx_packet *desc = &priv->tx_ring[priv->tx_write];
611 int len = (skb->len < ETH_ZLEN) ? ETH_ZLEN : skb->len;
612
613 desc->header.raw = METH_TX_CMD_INT_EN | (len-1) | ((128-len) << 16);
614 /* maybe I should set whole thing to 0 first... */
615 skb_copy_from_linear_data(skb, desc->data.dt + (120 - len), skb->len);
616 if (skb->len < len)
617 memset(desc->data.dt + 120 - len + skb->len, 0, len-skb->len);
618 }
619 #define TX_CATBUF1 BIT(25)
meth_tx_1page_prepare(struct meth_private * priv,struct sk_buff * skb)620 static void meth_tx_1page_prepare(struct meth_private *priv,
621 struct sk_buff *skb)
622 {
623 tx_packet *desc = &priv->tx_ring[priv->tx_write];
624 void *buffer_data = (void *)(((unsigned long)skb->data + 7) & ~7);
625 int unaligned_len = (int)((unsigned long)buffer_data - (unsigned long)skb->data);
626 int buffer_len = skb->len - unaligned_len;
627 dma_addr_t catbuf;
628
629 desc->header.raw = METH_TX_CMD_INT_EN | TX_CATBUF1 | (skb->len - 1);
630
631 /* unaligned part */
632 if (unaligned_len) {
633 skb_copy_from_linear_data(skb, desc->data.dt + (120 - unaligned_len),
634 unaligned_len);
635 desc->header.raw |= (128 - unaligned_len) << 16;
636 }
637
638 /* first page */
639 catbuf = dma_map_single(&priv->pdev->dev, buffer_data, buffer_len,
640 DMA_TO_DEVICE);
641 desc->data.cat_buf[0].form.start_addr = catbuf >> 3;
642 desc->data.cat_buf[0].form.len = buffer_len - 1;
643 }
644 #define TX_CATBUF2 BIT(26)
meth_tx_2page_prepare(struct meth_private * priv,struct sk_buff * skb)645 static void meth_tx_2page_prepare(struct meth_private *priv,
646 struct sk_buff *skb)
647 {
648 tx_packet *desc = &priv->tx_ring[priv->tx_write];
649 void *buffer1_data = (void *)(((unsigned long)skb->data + 7) & ~7);
650 void *buffer2_data = (void *)PAGE_ALIGN((unsigned long)skb->data);
651 int unaligned_len = (int)((unsigned long)buffer1_data - (unsigned long)skb->data);
652 int buffer1_len = (int)((unsigned long)buffer2_data - (unsigned long)buffer1_data);
653 int buffer2_len = skb->len - buffer1_len - unaligned_len;
654 dma_addr_t catbuf1, catbuf2;
655
656 desc->header.raw = METH_TX_CMD_INT_EN | TX_CATBUF1 | TX_CATBUF2| (skb->len - 1);
657 /* unaligned part */
658 if (unaligned_len){
659 skb_copy_from_linear_data(skb, desc->data.dt + (120 - unaligned_len),
660 unaligned_len);
661 desc->header.raw |= (128 - unaligned_len) << 16;
662 }
663
664 /* first page */
665 catbuf1 = dma_map_single(&priv->pdev->dev, buffer1_data, buffer1_len,
666 DMA_TO_DEVICE);
667 desc->data.cat_buf[0].form.start_addr = catbuf1 >> 3;
668 desc->data.cat_buf[0].form.len = buffer1_len - 1;
669 /* second page */
670 catbuf2 = dma_map_single(&priv->pdev->dev, buffer2_data, buffer2_len,
671 DMA_TO_DEVICE);
672 desc->data.cat_buf[1].form.start_addr = catbuf2 >> 3;
673 desc->data.cat_buf[1].form.len = buffer2_len - 1;
674 }
675
meth_add_to_tx_ring(struct meth_private * priv,struct sk_buff * skb)676 static void meth_add_to_tx_ring(struct meth_private *priv, struct sk_buff *skb)
677 {
678 /* Remember the skb, so we can free it at interrupt time */
679 priv->tx_skbs[priv->tx_write] = skb;
680 if (skb->len <= 120) {
681 /* Whole packet fits into descriptor */
682 meth_tx_short_prepare(priv, skb);
683 } else if (PAGE_ALIGN((unsigned long)skb->data) !=
684 PAGE_ALIGN((unsigned long)skb->data + skb->len - 1)) {
685 /* Packet crosses page boundary */
686 meth_tx_2page_prepare(priv, skb);
687 } else {
688 /* Packet is in one page */
689 meth_tx_1page_prepare(priv, skb);
690 }
691 priv->tx_write = (priv->tx_write + 1) & (TX_RING_ENTRIES - 1);
692 mace->eth.tx_info = priv->tx_write;
693 priv->tx_count++;
694 }
695
696 /*
697 * Transmit a packet (called by the kernel)
698 */
meth_tx(struct sk_buff * skb,struct net_device * dev)699 static netdev_tx_t meth_tx(struct sk_buff *skb, struct net_device *dev)
700 {
701 struct meth_private *priv = netdev_priv(dev);
702 unsigned long flags;
703
704 spin_lock_irqsave(&priv->meth_lock, flags);
705 /* Stop DMA notification */
706 priv->dma_ctrl &= ~(METH_DMA_TX_INT_EN);
707 mace->eth.dma_ctrl = priv->dma_ctrl;
708
709 meth_add_to_tx_ring(priv, skb);
710 netif_trans_update(dev); /* save the timestamp */
711
712 /* If TX ring is full, tell the upper layer to stop sending packets */
713 if (meth_tx_full(dev)) {
714 printk(KERN_DEBUG "TX full: stopping\n");
715 netif_stop_queue(dev);
716 }
717
718 /* Restart DMA notification */
719 priv->dma_ctrl |= METH_DMA_TX_INT_EN;
720 mace->eth.dma_ctrl = priv->dma_ctrl;
721
722 spin_unlock_irqrestore(&priv->meth_lock, flags);
723
724 return NETDEV_TX_OK;
725 }
726
727 /*
728 * Deal with a transmit timeout.
729 */
meth_tx_timeout(struct net_device * dev,unsigned int txqueue)730 static void meth_tx_timeout(struct net_device *dev, unsigned int txqueue)
731 {
732 struct meth_private *priv = netdev_priv(dev);
733 unsigned long flags;
734
735 printk(KERN_WARNING "%s: transmit timed out\n", dev->name);
736
737 /* Protect against concurrent rx interrupts */
738 spin_lock_irqsave(&priv->meth_lock,flags);
739
740 /* Try to reset the interface. */
741 meth_reset(dev);
742
743 dev->stats.tx_errors++;
744
745 /* Clear all rings */
746 meth_free_tx_ring(priv);
747 meth_free_rx_ring(priv);
748 meth_init_tx_ring(priv);
749 meth_init_rx_ring(priv);
750
751 /* Restart dma */
752 priv->dma_ctrl |= METH_DMA_TX_EN | METH_DMA_RX_EN | METH_DMA_RX_INT_EN;
753 mace->eth.dma_ctrl = priv->dma_ctrl;
754
755 /* Enable interrupt */
756 spin_unlock_irqrestore(&priv->meth_lock, flags);
757
758 netif_trans_update(dev); /* prevent tx timeout */
759 netif_wake_queue(dev);
760 }
761
762 /*
763 * Ioctl commands
764 */
meth_ioctl(struct net_device * dev,struct ifreq * rq,int cmd)765 static int meth_ioctl(struct net_device *dev, struct ifreq *rq, int cmd)
766 {
767 /* XXX Not yet implemented */
768 switch(cmd) {
769 case SIOCGMIIPHY:
770 case SIOCGMIIREG:
771 case SIOCSMIIREG:
772 default:
773 return -EOPNOTSUPP;
774 }
775 }
776
meth_set_rx_mode(struct net_device * dev)777 static void meth_set_rx_mode(struct net_device *dev)
778 {
779 struct meth_private *priv = netdev_priv(dev);
780 unsigned long flags;
781
782 netif_stop_queue(dev);
783 spin_lock_irqsave(&priv->meth_lock, flags);
784 priv->mac_ctrl &= ~METH_PROMISC;
785
786 if (dev->flags & IFF_PROMISC) {
787 priv->mac_ctrl |= METH_PROMISC;
788 priv->mcast_filter = 0xffffffffffffffffUL;
789 } else if ((netdev_mc_count(dev) > METH_MCF_LIMIT) ||
790 (dev->flags & IFF_ALLMULTI)) {
791 priv->mac_ctrl |= METH_ACCEPT_AMCAST;
792 priv->mcast_filter = 0xffffffffffffffffUL;
793 } else {
794 struct netdev_hw_addr *ha;
795 priv->mac_ctrl |= METH_ACCEPT_MCAST;
796
797 netdev_for_each_mc_addr(ha, dev)
798 set_bit((ether_crc(ETH_ALEN, ha->addr) >> 26),
799 (volatile unsigned long *)&priv->mcast_filter);
800 }
801
802 /* Write the changes to the chip registers. */
803 mace->eth.mac_ctrl = priv->mac_ctrl;
804 mace->eth.mcast_filter = priv->mcast_filter;
805
806 /* Done! */
807 spin_unlock_irqrestore(&priv->meth_lock, flags);
808 netif_wake_queue(dev);
809 }
810
811 static const struct net_device_ops meth_netdev_ops = {
812 .ndo_open = meth_open,
813 .ndo_stop = meth_release,
814 .ndo_start_xmit = meth_tx,
815 .ndo_eth_ioctl = meth_ioctl,
816 .ndo_tx_timeout = meth_tx_timeout,
817 .ndo_validate_addr = eth_validate_addr,
818 .ndo_set_mac_address = eth_mac_addr,
819 .ndo_set_rx_mode = meth_set_rx_mode,
820 };
821
822 /*
823 * The init function.
824 */
meth_probe(struct platform_device * pdev)825 static int meth_probe(struct platform_device *pdev)
826 {
827 struct net_device *dev;
828 struct meth_private *priv;
829 int err;
830
831 dev = alloc_etherdev(sizeof(struct meth_private));
832 if (!dev)
833 return -ENOMEM;
834
835 dev->netdev_ops = &meth_netdev_ops;
836 dev->watchdog_timeo = timeout;
837 dev->irq = MACE_ETHERNET_IRQ;
838 dev->base_addr = (unsigned long)&mace->eth;
839 eth_hw_addr_set(dev, o2meth_eaddr);
840
841 priv = netdev_priv(dev);
842 priv->pdev = pdev;
843 spin_lock_init(&priv->meth_lock);
844 SET_NETDEV_DEV(dev, &pdev->dev);
845
846 err = register_netdev(dev);
847 if (err) {
848 free_netdev(dev);
849 return err;
850 }
851
852 printk(KERN_INFO "%s: SGI MACE Ethernet rev. %d\n",
853 dev->name, (unsigned int)(mace->eth.mac_ctrl >> 29));
854 return 0;
855 }
856
meth_remove(struct platform_device * pdev)857 static int meth_remove(struct platform_device *pdev)
858 {
859 struct net_device *dev = platform_get_drvdata(pdev);
860
861 unregister_netdev(dev);
862 free_netdev(dev);
863
864 return 0;
865 }
866
867 static struct platform_driver meth_driver = {
868 .probe = meth_probe,
869 .remove = meth_remove,
870 .driver = {
871 .name = "meth",
872 }
873 };
874
875 module_platform_driver(meth_driver);
876
877 MODULE_AUTHOR("Ilya Volynets <ilya@theIlya.com>");
878 MODULE_DESCRIPTION("SGI O2 Builtin Fast Ethernet driver");
879 MODULE_LICENSE("GPL");
880 MODULE_ALIAS("platform:meth");
881