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korina: reset resource buffer size to 1536
[linux-2.6/verdex.git] / drivers / net / korina.c
blobe30c2f437d193c22ca065c9f8255422d33c88c72
1 /*
2 * Driver for the IDT RC32434 (Korina) on-chip ethernet controller.
3 *
4 * Copyright 2004 IDT Inc. (rischelp@idt.com)
5 * Copyright 2006 Felix Fietkau <nbd@openwrt.org>
6 * Copyright 2008 Florian Fainelli <florian@openwrt.org>
7 *
8 * This program is free software; you can redistribute it and/or modify it
9 * under the terms of the GNU General Public License as published by the
10 * Free Software Foundation; either version 2 of the License, or (at your
11 * option) any later version.
12 *
13 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
14 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
15 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN
16 * NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
17 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
18 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
19 * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
20 * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
21 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
22 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
23 *
24 * You should have received a copy of the GNU General Public License along
25 * with this program; if not, write to the Free Software Foundation, Inc.,
26 * 675 Mass Ave, Cambridge, MA 02139, USA.
27 *
28 * Writing to a DMA status register:
29 *
30 * When writing to the status register, you should mask the bit you have
31 * been testing the status register with. Both Tx and Rx DMA registers
32 * should stick to this procedure.
33 */
34
35 #include <linux/module.h>
36 #include <linux/kernel.h>
37 #include <linux/moduleparam.h>
38 #include <linux/sched.h>
39 #include <linux/ctype.h>
40 #include <linux/types.h>
41 #include <linux/interrupt.h>
42 #include <linux/init.h>
43 #include <linux/ioport.h>
44 #include <linux/in.h>
45 #include <linux/slab.h>
46 #include <linux/string.h>
47 #include <linux/delay.h>
48 #include <linux/netdevice.h>
49 #include <linux/etherdevice.h>
50 #include <linux/skbuff.h>
51 #include <linux/errno.h>
52 #include <linux/platform_device.h>
53 #include <linux/mii.h>
54 #include <linux/ethtool.h>
55 #include <linux/crc32.h>
56
57 #include <asm/bootinfo.h>
58 #include <asm/system.h>
59 #include <asm/bitops.h>
60 #include <asm/pgtable.h>
61 #include <asm/segment.h>
62 #include <asm/io.h>
63 #include <asm/dma.h>
64
65 #include <asm/mach-rc32434/rb.h>
66 #include <asm/mach-rc32434/rc32434.h>
67 #include <asm/mach-rc32434/eth.h>
68 #include <asm/mach-rc32434/dma_v.h>
69
70 #define DRV_NAME "korina"
71 #define DRV_VERSION "0.10"
72 #define DRV_RELDATE "04Mar2008"
73
74 #define STATION_ADDRESS_HIGH(dev) (((dev)->dev_addr[0] << 8) | \
75 ((dev)->dev_addr[1]))
76 #define STATION_ADDRESS_LOW(dev) (((dev)->dev_addr[2] << 24) | \
77 ((dev)->dev_addr[3] << 16) | \
78 ((dev)->dev_addr[4] << 8) | \
79 ((dev)->dev_addr[5]))
80
81 #define MII_CLOCK 1250000 /* no more than 2.5MHz */
82
83 /* the following must be powers of two */
84 #define KORINA_NUM_RDS 64 /* number of receive descriptors */
85 #define KORINA_NUM_TDS 64 /* number of transmit descriptors */
86
87 /* KORINA_RBSIZE is the hardware's default maximum receive
88 * frame size in bytes. Having this hardcoded means that there
89 * is no support for MTU sizes greater than 1500. */
90 #define KORINA_RBSIZE 1536 /* size of one resource buffer = Ether MTU */
91 #define KORINA_RDS_MASK (KORINA_NUM_RDS - 1)
92 #define KORINA_TDS_MASK (KORINA_NUM_TDS - 1)
93 #define RD_RING_SIZE (KORINA_NUM_RDS * sizeof(struct dma_desc))
94 #define TD_RING_SIZE (KORINA_NUM_TDS * sizeof(struct dma_desc))
95
96 #define TX_TIMEOUT (6000 * HZ / 1000)
97
98 enum chain_status { desc_filled, desc_empty };
99 #define IS_DMA_FINISHED(X) (((X) & (DMA_DESC_FINI)) != 0)
100 #define IS_DMA_DONE(X) (((X) & (DMA_DESC_DONE)) != 0)
101 #define RCVPKT_LENGTH(X) (((X) & ETH_RX_LEN) >> ETH_RX_LEN_BIT)
102
103 /* Information that need to be kept for each board. */
104 struct korina_private {
105 struct eth_regs *eth_regs;
106 struct dma_reg *rx_dma_regs;
107 struct dma_reg *tx_dma_regs;
108 struct dma_desc *td_ring; /* transmit descriptor ring */
109 struct dma_desc *rd_ring; /* receive descriptor ring */
110
111 struct sk_buff *tx_skb[KORINA_NUM_TDS];
112 struct sk_buff *rx_skb[KORINA_NUM_RDS];
113
114 int rx_next_done;
115 int rx_chain_head;
116 int rx_chain_tail;
117 enum chain_status rx_chain_status;
118
119 int tx_next_done;
120 int tx_chain_head;
121 int tx_chain_tail;
122 enum chain_status tx_chain_status;
123 int tx_count;
124 int tx_full;
125
126 int rx_irq;
127 int tx_irq;
128 int ovr_irq;
129 int und_irq;
130
131 spinlock_t lock; /* NIC xmit lock */
132
133 int dma_halt_cnt;
134 int dma_run_cnt;
135 struct napi_struct napi;
136 struct mii_if_info mii_if;
137 struct net_device *dev;
138 int phy_addr;
139 };
140
141 extern unsigned int idt_cpu_freq;
142
143 static inline void korina_start_dma(struct dma_reg *ch, u32 dma_addr)
144 {
145 writel(0, &ch->dmandptr);
146 writel(dma_addr, &ch->dmadptr);
147 }
148
149 static inline void korina_abort_dma(struct net_device *dev,
150 struct dma_reg *ch)
151 {
152 if (readl(&ch->dmac) & DMA_CHAN_RUN_BIT) {
153 writel(0x10, &ch->dmac);
154
155 while (!(readl(&ch->dmas) & DMA_STAT_HALT))
156 dev->trans_start = jiffies;
157
158 writel(0, &ch->dmas);
159 }
160
161 writel(0, &ch->dmadptr);
162 writel(0, &ch->dmandptr);
163 }
164
165 static inline void korina_chain_dma(struct dma_reg *ch, u32 dma_addr)
166 {
167 writel(dma_addr, &ch->dmandptr);
168 }
169
170 static void korina_abort_tx(struct net_device *dev)
171 {
172 struct korina_private *lp = netdev_priv(dev);
173
174 korina_abort_dma(dev, lp->tx_dma_regs);
175 }
176
177 static void korina_abort_rx(struct net_device *dev)
178 {
179 struct korina_private *lp = netdev_priv(dev);
180
181 korina_abort_dma(dev, lp->rx_dma_regs);
182 }
183
184 static void korina_start_rx(struct korina_private *lp,
185 struct dma_desc *rd)
186 {
187 korina_start_dma(lp->rx_dma_regs, CPHYSADDR(rd));
188 }
189
190 static void korina_chain_rx(struct korina_private *lp,
191 struct dma_desc *rd)
192 {
193 korina_chain_dma(lp->rx_dma_regs, CPHYSADDR(rd));
194 }
195
196 /* transmit packet */
197 static int korina_send_packet(struct sk_buff *skb, struct net_device *dev)
198 {
199 struct korina_private *lp = netdev_priv(dev);
200 unsigned long flags;
201 u32 length;
202 u32 chain_index;
203 struct dma_desc *td;
204
205 spin_lock_irqsave(&lp->lock, flags);
206
207 td = &lp->td_ring[lp->tx_chain_tail];
208
209 /* stop queue when full, drop pkts if queue already full */
210 if (lp->tx_count >= (KORINA_NUM_TDS - 2)) {
211 lp->tx_full = 1;
212
213 if (lp->tx_count == (KORINA_NUM_TDS - 2))
214 netif_stop_queue(dev);
215 else {
216 dev->stats.tx_dropped++;
217 dev_kfree_skb_any(skb);
218 spin_unlock_irqrestore(&lp->lock, flags);
219
220 return NETDEV_TX_BUSY;
221 }
222 }
223
224 lp->tx_count++;
225
226 lp->tx_skb[lp->tx_chain_tail] = skb;
227
228 length = skb->len;
229 dma_cache_wback((u32)skb->data, skb->len);
230
231 /* Setup the transmit descriptor. */
232 dma_cache_inv((u32) td, sizeof(*td));
233 td->ca = CPHYSADDR(skb->data);
234 chain_index = (lp->tx_chain_tail - 1) &
235 KORINA_TDS_MASK;
236
237 if (readl(&(lp->tx_dma_regs->dmandptr)) == 0) {
238 if (lp->tx_chain_status == desc_empty) {
239 /* Update tail */
240 td->control = DMA_COUNT(length) |
241 DMA_DESC_COF | DMA_DESC_IOF;
242 /* Move tail */
243 lp->tx_chain_tail = chain_index;
244 /* Write to NDPTR */
245 writel(CPHYSADDR(&lp->td_ring[lp->tx_chain_head]),
246 &lp->tx_dma_regs->dmandptr);
247 /* Move head to tail */
248 lp->tx_chain_head = lp->tx_chain_tail;
249 } else {
250 /* Update tail */
251 td->control = DMA_COUNT(length) |
252 DMA_DESC_COF | DMA_DESC_IOF;
253 /* Link to prev */
254 lp->td_ring[chain_index].control &=
255 ~DMA_DESC_COF;
256 /* Link to prev */
257 lp->td_ring[chain_index].link = CPHYSADDR(td);
258 /* Move tail */
259 lp->tx_chain_tail = chain_index;
260 /* Write to NDPTR */
261 writel(CPHYSADDR(&lp->td_ring[lp->tx_chain_head]),
262 &(lp->tx_dma_regs->dmandptr));
263 /* Move head to tail */
264 lp->tx_chain_head = lp->tx_chain_tail;
265 lp->tx_chain_status = desc_empty;
266 }
267 } else {
268 if (lp->tx_chain_status == desc_empty) {
269 /* Update tail */
270 td->control = DMA_COUNT(length) |
271 DMA_DESC_COF | DMA_DESC_IOF;
272 /* Move tail */
273 lp->tx_chain_tail = chain_index;
274 lp->tx_chain_status = desc_filled;
275 netif_stop_queue(dev);
276 } else {
277 /* Update tail */
278 td->control = DMA_COUNT(length) |
279 DMA_DESC_COF | DMA_DESC_IOF;
280 lp->td_ring[chain_index].control &=
281 ~DMA_DESC_COF;
282 lp->td_ring[chain_index].link = CPHYSADDR(td);
283 lp->tx_chain_tail = chain_index;
284 }
285 }
286 dma_cache_wback((u32) td, sizeof(*td));
287
288 dev->trans_start = jiffies;
289 spin_unlock_irqrestore(&lp->lock, flags);
290
291 return NETDEV_TX_OK;
292 }
293
294 static int mdio_read(struct net_device *dev, int mii_id, int reg)
295 {
296 struct korina_private *lp = netdev_priv(dev);
297 int ret;
298
299 mii_id = ((lp->rx_irq == 0x2c ? 1 : 0) << 8);
300
301 writel(0, &lp->eth_regs->miimcfg);
302 writel(0, &lp->eth_regs->miimcmd);
303 writel(mii_id | reg, &lp->eth_regs->miimaddr);
304 writel(ETH_MII_CMD_SCN, &lp->eth_regs->miimcmd);
305
306 ret = (int)(readl(&lp->eth_regs->miimrdd));
307 return ret;
308 }
309
310 static void mdio_write(struct net_device *dev, int mii_id, int reg, int val)
311 {
312 struct korina_private *lp = netdev_priv(dev);
313
314 mii_id = ((lp->rx_irq == 0x2c ? 1 : 0) << 8);
315
316 writel(0, &lp->eth_regs->miimcfg);
317 writel(1, &lp->eth_regs->miimcmd);
318 writel(mii_id | reg, &lp->eth_regs->miimaddr);
319 writel(ETH_MII_CMD_SCN, &lp->eth_regs->miimcmd);
320 writel(val, &lp->eth_regs->miimwtd);
321 }
322
323 /* Ethernet Rx DMA interrupt */
324 static irqreturn_t korina_rx_dma_interrupt(int irq, void *dev_id)
325 {
326 struct net_device *dev = dev_id;
327 struct korina_private *lp = netdev_priv(dev);
328 u32 dmas, dmasm;
329 irqreturn_t retval;
330
331 dmas = readl(&lp->rx_dma_regs->dmas);
332 if (dmas & (DMA_STAT_DONE | DMA_STAT_HALT | DMA_STAT_ERR)) {
333 netif_rx_schedule_prep(&lp->napi);
334
335 dmasm = readl(&lp->rx_dma_regs->dmasm);
336 writel(dmasm | (DMA_STAT_DONE |
337 DMA_STAT_HALT | DMA_STAT_ERR),
338 &lp->rx_dma_regs->dmasm);
339
340 if (dmas & DMA_STAT_ERR)
341 printk(KERN_ERR DRV_NAME "%s: DMA error\n", dev->name);
342
343 retval = IRQ_HANDLED;
344 } else
345 retval = IRQ_NONE;
346
347 return retval;
348 }
349
350 static int korina_rx(struct net_device *dev, int limit)
351 {
352 struct korina_private *lp = netdev_priv(dev);
353 struct dma_desc *rd = &lp->rd_ring[lp->rx_next_done];
354 struct sk_buff *skb, *skb_new;
355 u8 *pkt_buf;
356 u32 devcs, pkt_len, dmas, rx_free_desc;
357 int count;
358
359 dma_cache_inv((u32)rd, sizeof(*rd));
360
361 for (count = 0; count < limit; count++) {
362
363 devcs = rd->devcs;
364
365 /* Update statistics counters */
366 if (devcs & ETH_RX_CRC)
367 dev->stats.rx_crc_errors++;
368 if (devcs & ETH_RX_LOR)
369 dev->stats.rx_length_errors++;
370 if (devcs & ETH_RX_LE)
371 dev->stats.rx_length_errors++;
372 if (devcs & ETH_RX_OVR)
373 dev->stats.rx_over_errors++;
374 if (devcs & ETH_RX_CV)
375 dev->stats.rx_frame_errors++;
376 if (devcs & ETH_RX_CES)
377 dev->stats.rx_length_errors++;
378 if (devcs & ETH_RX_MP)
379 dev->stats.multicast++;
380
381 if ((devcs & ETH_RX_LD) != ETH_RX_LD) {
382 /* check that this is a whole packet
383 * WARNING: DMA_FD bit incorrectly set
384 * in Rc32434 (errata ref #077) */
385 dev->stats.rx_errors++;
386 dev->stats.rx_dropped++;
387 }
388
389 while ((rx_free_desc = KORINA_RBSIZE - (u32)DMA_COUNT(rd->control)) != 0) {
390 /* init the var. used for the later
391 * operations within the while loop */
392 skb_new = NULL;
393 pkt_len = RCVPKT_LENGTH(devcs);
394 skb = lp->rx_skb[lp->rx_next_done];
395
396 if ((devcs & ETH_RX_ROK)) {
397 /* must be the (first and) last
398 * descriptor then */
399 pkt_buf = (u8 *)lp->rx_skb[lp->rx_next_done]->data;
400
401 /* invalidate the cache */
402 dma_cache_inv((unsigned long)pkt_buf, pkt_len - 4);
403
404 /* Malloc up new buffer. */
405 skb_new = netdev_alloc_skb(dev, KORINA_RBSIZE + 2);
406
407 if (!skb_new)
408 break;
409 /* Do not count the CRC */
410 skb_put(skb, pkt_len - 4);
411 skb->protocol = eth_type_trans(skb, dev);
412
413 /* Pass the packet to upper layers */
414 netif_receive_skb(skb);
415 dev->stats.rx_packets++;
416 dev->stats.rx_bytes += pkt_len;
417
418 /* Update the mcast stats */
419 if (devcs & ETH_RX_MP)
420 dev->stats.multicast++;
421
422 lp->rx_skb[lp->rx_next_done] = skb_new;
423 }
424
425 rd->devcs = 0;
426
427 /* Restore descriptor's curr_addr */
428 if (skb_new)
429 rd->ca = CPHYSADDR(skb_new->data);
430 else
431 rd->ca = CPHYSADDR(skb->data);
432
433 rd->control = DMA_COUNT(KORINA_RBSIZE) |
434 DMA_DESC_COD | DMA_DESC_IOD;
435 lp->rd_ring[(lp->rx_next_done - 1) &
436 KORINA_RDS_MASK].control &=
437 ~DMA_DESC_COD;
438
439 lp->rx_next_done = (lp->rx_next_done + 1) & KORINA_RDS_MASK;
440 dma_cache_wback((u32)rd, sizeof(*rd));
441 rd = &lp->rd_ring[lp->rx_next_done];
442 writel(~DMA_STAT_DONE, &lp->rx_dma_regs->dmas);
443 }
444 }
445
446 dmas = readl(&lp->rx_dma_regs->dmas);
447
448 if (dmas & DMA_STAT_HALT) {
449 writel(~(DMA_STAT_HALT | DMA_STAT_ERR),
450 &lp->rx_dma_regs->dmas);
451
452 lp->dma_halt_cnt++;
453 rd->devcs = 0;
454 skb = lp->rx_skb[lp->rx_next_done];
455 rd->ca = CPHYSADDR(skb->data);
456 dma_cache_wback((u32)rd, sizeof(*rd));
457 korina_chain_rx(lp, rd);
458 }
459
460 return count;
461 }
462
463 static int korina_poll(struct napi_struct *napi, int budget)
464 {
465 struct korina_private *lp =
466 container_of(napi, struct korina_private, napi);
467 struct net_device *dev = lp->dev;
468 int work_done;
469
470 work_done = korina_rx(dev, budget);
471 if (work_done < budget) {
472 netif_rx_complete(napi);
473
474 writel(readl(&lp->rx_dma_regs->dmasm) &
475 ~(DMA_STAT_DONE | DMA_STAT_HALT | DMA_STAT_ERR),
476 &lp->rx_dma_regs->dmasm);
477 }
478 return work_done;
479 }
480
481 /*
482 * Set or clear the multicast filter for this adaptor.
483 */
484 static void korina_multicast_list(struct net_device *dev)
485 {
486 struct korina_private *lp = netdev_priv(dev);
487 unsigned long flags;
488 struct dev_mc_list *dmi = dev->mc_list;
489 u32 recognise = ETH_ARC_AB; /* always accept broadcasts */
490 int i;
491
492 /* Set promiscuous mode */
493 if (dev->flags & IFF_PROMISC)
494 recognise |= ETH_ARC_PRO;
495
496 else if ((dev->flags & IFF_ALLMULTI) || (dev->mc_count > 4))
497 /* All multicast and broadcast */
498 recognise |= ETH_ARC_AM;
499
500 /* Build the hash table */
501 if (dev->mc_count > 4) {
502 u16 hash_table[4];
503 u32 crc;
504
505 for (i = 0; i < 4; i++)
506 hash_table[i] = 0;
507
508 for (i = 0; i < dev->mc_count; i++) {
509 char *addrs = dmi->dmi_addr;
510
511 dmi = dmi->next;
512
513 if (!(*addrs & 1))
514 continue;
515
516 crc = ether_crc_le(6, addrs);
517 crc >>= 26;
518 hash_table[crc >> 4] |= 1 << (15 - (crc & 0xf));
519 }
520 /* Accept filtered multicast */
521 recognise |= ETH_ARC_AFM;
522
523 /* Fill the MAC hash tables with their values */
524 writel((u32)(hash_table[1] << 16 | hash_table[0]),
525 &lp->eth_regs->ethhash0);
526 writel((u32)(hash_table[3] << 16 | hash_table[2]),
527 &lp->eth_regs->ethhash1);
528 }
529
530 spin_lock_irqsave(&lp->lock, flags);
531 writel(recognise, &lp->eth_regs->etharc);
532 spin_unlock_irqrestore(&lp->lock, flags);
533 }
534
535 static void korina_tx(struct net_device *dev)
536 {
537 struct korina_private *lp = netdev_priv(dev);
538 struct dma_desc *td = &lp->td_ring[lp->tx_next_done];
539 u32 devcs;
540 u32 dmas;
541
542 spin_lock(&lp->lock);
543
544 /* Process all desc that are done */
545 while (IS_DMA_FINISHED(td->control)) {
546 if (lp->tx_full == 1) {
547 netif_wake_queue(dev);
548 lp->tx_full = 0;
549 }
550
551 devcs = lp->td_ring[lp->tx_next_done].devcs;
552 if ((devcs & (ETH_TX_FD | ETH_TX_LD)) !=
553 (ETH_TX_FD | ETH_TX_LD)) {
554 dev->stats.tx_errors++;
555 dev->stats.tx_dropped++;
556
557 /* Should never happen */
558 printk(KERN_ERR DRV_NAME "%s: split tx ignored\n",
559 dev->name);
560 } else if (devcs & ETH_TX_TOK) {
561 dev->stats.tx_packets++;
562 dev->stats.tx_bytes +=
563 lp->tx_skb[lp->tx_next_done]->len;
564 } else {
565 dev->stats.tx_errors++;
566 dev->stats.tx_dropped++;
567
568 /* Underflow */
569 if (devcs & ETH_TX_UND)
570 dev->stats.tx_fifo_errors++;
571
572 /* Oversized frame */
573 if (devcs & ETH_TX_OF)
574 dev->stats.tx_aborted_errors++;
575
576 /* Excessive deferrals */
577 if (devcs & ETH_TX_ED)
578 dev->stats.tx_carrier_errors++;
579
580 /* Collisions: medium busy */
581 if (devcs & ETH_TX_EC)
582 dev->stats.collisions++;
583
584 /* Late collision */
585 if (devcs & ETH_TX_LC)
586 dev->stats.tx_window_errors++;
587 }
588
589 /* We must always free the original skb */
590 if (lp->tx_skb[lp->tx_next_done]) {
591 dev_kfree_skb_any(lp->tx_skb[lp->tx_next_done]);
592 lp->tx_skb[lp->tx_next_done] = NULL;
593 }
594
595 lp->td_ring[lp->tx_next_done].control = DMA_DESC_IOF;
596 lp->td_ring[lp->tx_next_done].devcs = ETH_TX_FD | ETH_TX_LD;
597 lp->td_ring[lp->tx_next_done].link = 0;
598 lp->td_ring[lp->tx_next_done].ca = 0;
599 lp->tx_count--;
600
601 /* Go on to next transmission */
602 lp->tx_next_done = (lp->tx_next_done + 1) & KORINA_TDS_MASK;
603 td = &lp->td_ring[lp->tx_next_done];
604
605 }
606
607 /* Clear the DMA status register */
608 dmas = readl(&lp->tx_dma_regs->dmas);
609 writel(~dmas, &lp->tx_dma_regs->dmas);
610
611 writel(readl(&lp->tx_dma_regs->dmasm) &
612 ~(DMA_STAT_FINI | DMA_STAT_ERR),
613 &lp->tx_dma_regs->dmasm);
614
615 spin_unlock(&lp->lock);
616 }
617
618 static irqreturn_t
619 korina_tx_dma_interrupt(int irq, void *dev_id)
620 {
621 struct net_device *dev = dev_id;
622 struct korina_private *lp = netdev_priv(dev);
623 u32 dmas, dmasm;
624 irqreturn_t retval;
625
626 dmas = readl(&lp->tx_dma_regs->dmas);
627
628 if (dmas & (DMA_STAT_FINI | DMA_STAT_ERR)) {
629 korina_tx(dev);
630
631 dmasm = readl(&lp->tx_dma_regs->dmasm);
632 writel(dmasm | (DMA_STAT_FINI | DMA_STAT_ERR),
633 &lp->tx_dma_regs->dmasm);
634
635 if (lp->tx_chain_status == desc_filled &&
636 (readl(&(lp->tx_dma_regs->dmandptr)) == 0)) {
637 writel(CPHYSADDR(&lp->td_ring[lp->tx_chain_head]),
638 &(lp->tx_dma_regs->dmandptr));
639 lp->tx_chain_status = desc_empty;
640 lp->tx_chain_head = lp->tx_chain_tail;
641 dev->trans_start = jiffies;
642 }
643 if (dmas & DMA_STAT_ERR)
644 printk(KERN_ERR DRV_NAME "%s: DMA error\n", dev->name);
645
646 retval = IRQ_HANDLED;
647 } else
648 retval = IRQ_NONE;
649
650 return retval;
651 }
652
653
654 static void korina_check_media(struct net_device *dev, unsigned int init_media)
655 {
656 struct korina_private *lp = netdev_priv(dev);
657
658 mii_check_media(&lp->mii_if, 0, init_media);
659
660 if (lp->mii_if.full_duplex)
661 writel(readl(&lp->eth_regs->ethmac2) | ETH_MAC2_FD,
662 &lp->eth_regs->ethmac2);
663 else
664 writel(readl(&lp->eth_regs->ethmac2) & ~ETH_MAC2_FD,
665 &lp->eth_regs->ethmac2);
666 }
667
668 static void korina_set_carrier(struct mii_if_info *mii)
669 {
670 if (mii->force_media) {
671 /* autoneg is off: Link is always assumed to be up */
672 if (!netif_carrier_ok(mii->dev))
673 netif_carrier_on(mii->dev);
674 } else /* Let MMI library update carrier status */
675 korina_check_media(mii->dev, 0);
676 }
677
678 static int korina_ioctl(struct net_device *dev, struct ifreq *rq, int cmd)
679 {
680 struct korina_private *lp = netdev_priv(dev);
681 struct mii_ioctl_data *data = if_mii(rq);
682 int rc;
683
684 if (!netif_running(dev))
685 return -EINVAL;
686 spin_lock_irq(&lp->lock);
687 rc = generic_mii_ioctl(&lp->mii_if, data, cmd, NULL);
688 spin_unlock_irq(&lp->lock);
689 korina_set_carrier(&lp->mii_if);
690
691 return rc;
692 }
693
694 /* ethtool helpers */
695 static void netdev_get_drvinfo(struct net_device *dev,
696 struct ethtool_drvinfo *info)
697 {
698 struct korina_private *lp = netdev_priv(dev);
699
700 strcpy(info->driver, DRV_NAME);
701 strcpy(info->version, DRV_VERSION);
702 strcpy(info->bus_info, lp->dev->name);
703 }
704
705 static int netdev_get_settings(struct net_device *dev, struct ethtool_cmd *cmd)
706 {
707 struct korina_private *lp = netdev_priv(dev);
708 int rc;
709
710 spin_lock_irq(&lp->lock);
711 rc = mii_ethtool_gset(&lp->mii_if, cmd);
712 spin_unlock_irq(&lp->lock);
713
714 return rc;
715 }
716
717 static int netdev_set_settings(struct net_device *dev, struct ethtool_cmd *cmd)
718 {
719 struct korina_private *lp = netdev_priv(dev);
720 int rc;
721
722 spin_lock_irq(&lp->lock);
723 rc = mii_ethtool_sset(&lp->mii_if, cmd);
724 spin_unlock_irq(&lp->lock);
725 korina_set_carrier(&lp->mii_if);
726
727 return rc;
728 }
729
730 static u32 netdev_get_link(struct net_device *dev)
731 {
732 struct korina_private *lp = netdev_priv(dev);
733
734 return mii_link_ok(&lp->mii_if);
735 }
736
737 static struct ethtool_ops netdev_ethtool_ops = {
738 .get_drvinfo = netdev_get_drvinfo,
739 .get_settings = netdev_get_settings,
740 .set_settings = netdev_set_settings,
741 .get_link = netdev_get_link,
742 };
743
744 static void korina_alloc_ring(struct net_device *dev)
745 {
746 struct korina_private *lp = netdev_priv(dev);
747 int i;
748
749 /* Initialize the transmit descriptors */
750 for (i = 0; i < KORINA_NUM_TDS; i++) {
751 lp->td_ring[i].control = DMA_DESC_IOF;
752 lp->td_ring[i].devcs = ETH_TX_FD | ETH_TX_LD;
753 lp->td_ring[i].ca = 0;
754 lp->td_ring[i].link = 0;
755 }
756 lp->tx_next_done = lp->tx_chain_head = lp->tx_chain_tail =
757 lp->tx_full = lp->tx_count = 0;
758 lp->tx_chain_status = desc_empty;
759
760 /* Initialize the receive descriptors */
761 for (i = 0; i < KORINA_NUM_RDS; i++) {
762 struct sk_buff *skb = lp->rx_skb[i];
763
764 skb = dev_alloc_skb(KORINA_RBSIZE + 2);
765 if (!skb)
766 break;
767 skb_reserve(skb, 2);
768 lp->rx_skb[i] = skb;
769 lp->rd_ring[i].control = DMA_DESC_IOD |
770 DMA_COUNT(KORINA_RBSIZE);
771 lp->rd_ring[i].devcs = 0;
772 lp->rd_ring[i].ca = CPHYSADDR(skb->data);
773 lp->rd_ring[i].link = CPHYSADDR(&lp->rd_ring[i+1]);
774 }
775
776 /* loop back */
777 lp->rd_ring[i].link = CPHYSADDR(&lp->rd_ring[0]);
778 lp->rx_next_done = 0;
779
780 lp->rd_ring[i].control |= DMA_DESC_COD;
781 lp->rx_chain_head = 0;
782 lp->rx_chain_tail = 0;
783 lp->rx_chain_status = desc_empty;
784 }
785
786 static void korina_free_ring(struct net_device *dev)
787 {
788 struct korina_private *lp = netdev_priv(dev);
789 int i;
790
791 for (i = 0; i < KORINA_NUM_RDS; i++) {
792 lp->rd_ring[i].control = 0;
793 if (lp->rx_skb[i])
794 dev_kfree_skb_any(lp->rx_skb[i]);
795 lp->rx_skb[i] = NULL;
796 }
797
798 for (i = 0; i < KORINA_NUM_TDS; i++) {
799 lp->td_ring[i].control = 0;
800 if (lp->tx_skb[i])
801 dev_kfree_skb_any(lp->tx_skb[i]);
802 lp->tx_skb[i] = NULL;
803 }
804 }
805
806 /*
807 * Initialize the RC32434 ethernet controller.
808 */
809 static int korina_init(struct net_device *dev)
810 {
811 struct korina_private *lp = netdev_priv(dev);
812
813 /* Disable DMA */
814 korina_abort_tx(dev);
815 korina_abort_rx(dev);
816
817 /* reset ethernet logic */
818 writel(0, &lp->eth_regs->ethintfc);
819 while ((readl(&lp->eth_regs->ethintfc) & ETH_INT_FC_RIP))
820 dev->trans_start = jiffies;
821
822 /* Enable Ethernet Interface */
823 writel(ETH_INT_FC_EN, &lp->eth_regs->ethintfc);
824
825 /* Allocate rings */
826 korina_alloc_ring(dev);
827
828 writel(0, &lp->rx_dma_regs->dmas);
829 /* Start Rx DMA */
830 korina_start_rx(lp, &lp->rd_ring[0]);
831
832 writel(readl(&lp->tx_dma_regs->dmasm) &
833 ~(DMA_STAT_FINI | DMA_STAT_ERR),
834 &lp->tx_dma_regs->dmasm);
835 writel(readl(&lp->rx_dma_regs->dmasm) &
836 ~(DMA_STAT_DONE | DMA_STAT_HALT | DMA_STAT_ERR),
837 &lp->rx_dma_regs->dmasm);
838
839 /* Accept only packets destined for this Ethernet device address */
840 writel(ETH_ARC_AB, &lp->eth_regs->etharc);
841
842 /* Set all Ether station address registers to their initial values */
843 writel(STATION_ADDRESS_LOW(dev), &lp->eth_regs->ethsal0);
844 writel(STATION_ADDRESS_HIGH(dev), &lp->eth_regs->ethsah0);
845
846 writel(STATION_ADDRESS_LOW(dev), &lp->eth_regs->ethsal1);
847 writel(STATION_ADDRESS_HIGH(dev), &lp->eth_regs->ethsah1);
848
849 writel(STATION_ADDRESS_LOW(dev), &lp->eth_regs->ethsal2);
850 writel(STATION_ADDRESS_HIGH(dev), &lp->eth_regs->ethsah2);
851
852 writel(STATION_ADDRESS_LOW(dev), &lp->eth_regs->ethsal3);
853 writel(STATION_ADDRESS_HIGH(dev), &lp->eth_regs->ethsah3);
854
855
856 /* Frame Length Checking, Pad Enable, CRC Enable, Full Duplex set */
857 writel(ETH_MAC2_PE | ETH_MAC2_CEN | ETH_MAC2_FD,
858 &lp->eth_regs->ethmac2);
859
860 /* Back to back inter-packet-gap */
861 writel(0x15, &lp->eth_regs->ethipgt);
862 /* Non - Back to back inter-packet-gap */
863 writel(0x12, &lp->eth_regs->ethipgr);
864
865 /* Management Clock Prescaler Divisor
866 * Clock independent setting */
867 writel(((idt_cpu_freq) / MII_CLOCK + 1) & ~1,
868 &lp->eth_regs->ethmcp);
869
870 /* don't transmit until fifo contains 48b */
871 writel(48, &lp->eth_regs->ethfifott);
872
873 writel(ETH_MAC1_RE, &lp->eth_regs->ethmac1);
874
875 napi_enable(&lp->napi);
876 netif_start_queue(dev);
877
878 return 0;
879 }
880
881 /*
882 * Restart the RC32434 ethernet controller.
883 * FIXME: check the return status where we call it
884 */
885 static int korina_restart(struct net_device *dev)
886 {
887 struct korina_private *lp = netdev_priv(dev);
888 int ret;
889
890 /*
891 * Disable interrupts
892 */
893 disable_irq(lp->rx_irq);
894 disable_irq(lp->tx_irq);
895 disable_irq(lp->ovr_irq);
896 disable_irq(lp->und_irq);
897
898 writel(readl(&lp->tx_dma_regs->dmasm) |
899 DMA_STAT_FINI | DMA_STAT_ERR,
900 &lp->tx_dma_regs->dmasm);
901 writel(readl(&lp->rx_dma_regs->dmasm) |
902 DMA_STAT_DONE | DMA_STAT_HALT | DMA_STAT_ERR,
903 &lp->rx_dma_regs->dmasm);
904
905 korina_free_ring(dev);
906
907 ret = korina_init(dev);
908 if (ret < 0) {
909 printk(KERN_ERR DRV_NAME "%s: cannot restart device\n",
910 dev->name);
911 return ret;
912 }
913 korina_multicast_list(dev);
914
915 enable_irq(lp->und_irq);
916 enable_irq(lp->ovr_irq);
917 enable_irq(lp->tx_irq);
918 enable_irq(lp->rx_irq);
919
920 return ret;
921 }
922
923 static void korina_clear_and_restart(struct net_device *dev, u32 value)
924 {
925 struct korina_private *lp = netdev_priv(dev);
926
927 netif_stop_queue(dev);
928 writel(value, &lp->eth_regs->ethintfc);
929 korina_restart(dev);
930 }
931
932 /* Ethernet Tx Underflow interrupt */
933 static irqreturn_t korina_und_interrupt(int irq, void *dev_id)
934 {
935 struct net_device *dev = dev_id;
936 struct korina_private *lp = netdev_priv(dev);
937 unsigned int und;
938
939 spin_lock(&lp->lock);
940
941 und = readl(&lp->eth_regs->ethintfc);
942
943 if (und & ETH_INT_FC_UND)
944 korina_clear_and_restart(dev, und & ~ETH_INT_FC_UND);
945
946 spin_unlock(&lp->lock);
947
948 return IRQ_HANDLED;
949 }
950
951 static void korina_tx_timeout(struct net_device *dev)
952 {
953 struct korina_private *lp = netdev_priv(dev);
954 unsigned long flags;
955
956 spin_lock_irqsave(&lp->lock, flags);
957 korina_restart(dev);
958 spin_unlock_irqrestore(&lp->lock, flags);
959 }
960
961 /* Ethernet Rx Overflow interrupt */
962 static irqreturn_t
963 korina_ovr_interrupt(int irq, void *dev_id)
964 {
965 struct net_device *dev = dev_id;
966 struct korina_private *lp = netdev_priv(dev);
967 unsigned int ovr;
968
969 spin_lock(&lp->lock);
970 ovr = readl(&lp->eth_regs->ethintfc);
971
972 if (ovr & ETH_INT_FC_OVR)
973 korina_clear_and_restart(dev, ovr & ~ETH_INT_FC_OVR);
974
975 spin_unlock(&lp->lock);
976
977 return IRQ_HANDLED;
978 }
979
980 #ifdef CONFIG_NET_POLL_CONTROLLER
981 static void korina_poll_controller(struct net_device *dev)
982 {
983 disable_irq(dev->irq);
984 korina_tx_dma_interrupt(dev->irq, dev);
985 enable_irq(dev->irq);
986 }
987 #endif
988
989 static int korina_open(struct net_device *dev)
990 {
991 struct korina_private *lp = netdev_priv(dev);
992 int ret;
993
994 /* Initialize */
995 ret = korina_init(dev);
996 if (ret < 0) {
997 printk(KERN_ERR DRV_NAME "%s: cannot open device\n", dev->name);
998 goto out;
999 }
1000
1001 /* Install the interrupt handler
1002 * that handles the Done Finished
1003 * Ovr and Und Events */
1004 ret = request_irq(lp->rx_irq, &korina_rx_dma_interrupt,
1005 IRQF_SHARED | IRQF_DISABLED, "Korina ethernet Rx", dev);
1006 if (ret < 0) {
1007 printk(KERN_ERR DRV_NAME "%s: unable to get Rx DMA IRQ %d\n",
1008 dev->name, lp->rx_irq);
1009 goto err_release;
1010 }
1011 ret = request_irq(lp->tx_irq, &korina_tx_dma_interrupt,
1012 IRQF_SHARED | IRQF_DISABLED, "Korina ethernet Tx", dev);
1013 if (ret < 0) {
1014 printk(KERN_ERR DRV_NAME "%s: unable to get Tx DMA IRQ %d\n",
1015 dev->name, lp->tx_irq);
1016 goto err_free_rx_irq;
1017 }
1018
1019 /* Install handler for overrun error. */
1020 ret = request_irq(lp->ovr_irq, &korina_ovr_interrupt,
1021 IRQF_SHARED | IRQF_DISABLED, "Ethernet Overflow", dev);
1022 if (ret < 0) {
1023 printk(KERN_ERR DRV_NAME"%s: unable to get OVR IRQ %d\n",
1024 dev->name, lp->ovr_irq);
1025 goto err_free_tx_irq;
1026 }
1027
1028 /* Install handler for underflow error. */
1029 ret = request_irq(lp->und_irq, &korina_und_interrupt,
1030 IRQF_SHARED | IRQF_DISABLED, "Ethernet Underflow", dev);
1031 if (ret < 0) {
1032 printk(KERN_ERR DRV_NAME "%s: unable to get UND IRQ %d\n",
1033 dev->name, lp->und_irq);
1034 goto err_free_ovr_irq;
1035 }
1036 out:
1037 return ret;
1038
1039 err_free_ovr_irq:
1040 free_irq(lp->ovr_irq, dev);
1041 err_free_tx_irq:
1042 free_irq(lp->tx_irq, dev);
1043 err_free_rx_irq:
1044 free_irq(lp->rx_irq, dev);
1045 err_release:
1046 korina_free_ring(dev);
1047 goto out;
1048 }
1049
1050 static int korina_close(struct net_device *dev)
1051 {
1052 struct korina_private *lp = netdev_priv(dev);
1053 u32 tmp;
1054
1055 /* Disable interrupts */
1056 disable_irq(lp->rx_irq);
1057 disable_irq(lp->tx_irq);
1058 disable_irq(lp->ovr_irq);
1059 disable_irq(lp->und_irq);
1060
1061 korina_abort_tx(dev);
1062 tmp = readl(&lp->tx_dma_regs->dmasm);
1063 tmp = tmp | DMA_STAT_FINI | DMA_STAT_ERR;
1064 writel(tmp, &lp->tx_dma_regs->dmasm);
1065
1066 korina_abort_rx(dev);
1067 tmp = readl(&lp->rx_dma_regs->dmasm);
1068 tmp = tmp | DMA_STAT_DONE | DMA_STAT_HALT | DMA_STAT_ERR;
1069 writel(tmp, &lp->rx_dma_regs->dmasm);
1070
1071 korina_free_ring(dev);
1072
1073 free_irq(lp->rx_irq, dev);
1074 free_irq(lp->tx_irq, dev);
1075 free_irq(lp->ovr_irq, dev);
1076 free_irq(lp->und_irq, dev);
1077
1078 return 0;
1079 }
1080
1081 static int korina_probe(struct platform_device *pdev)
1082 {
1083 struct korina_device *bif = platform_get_drvdata(pdev);
1084 struct korina_private *lp;
1085 struct net_device *dev;
1086 struct resource *r;
1087 int rc;
1088
1089 dev = alloc_etherdev(sizeof(struct korina_private));
1090 if (!dev) {
1091 printk(KERN_ERR DRV_NAME ": alloc_etherdev failed\n");
1092 return -ENOMEM;
1093 }
1094 SET_NETDEV_DEV(dev, &pdev->dev);
1095 lp = netdev_priv(dev);
1096
1097 bif->dev = dev;
1098 memcpy(dev->dev_addr, bif->mac, 6);
1099
1100 lp->rx_irq = platform_get_irq_byname(pdev, "korina_rx");
1101 lp->tx_irq = platform_get_irq_byname(pdev, "korina_tx");
1102 lp->ovr_irq = platform_get_irq_byname(pdev, "korina_ovr");
1103 lp->und_irq = platform_get_irq_byname(pdev, "korina_und");
1104
1105 r = platform_get_resource_byname(pdev, IORESOURCE_MEM, "korina_regs");
1106 dev->base_addr = r->start;
1107 lp->eth_regs = ioremap_nocache(r->start, r->end - r->start);
1108 if (!lp->eth_regs) {
1109 printk(KERN_ERR DRV_NAME "cannot remap registers\n");
1110 rc = -ENXIO;
1111 goto probe_err_out;
1112 }
1113
1114 r = platform_get_resource_byname(pdev, IORESOURCE_MEM, "korina_dma_rx");
1115 lp->rx_dma_regs = ioremap_nocache(r->start, r->end - r->start);
1116 if (!lp->rx_dma_regs) {
1117 printk(KERN_ERR DRV_NAME "cannot remap Rx DMA registers\n");
1118 rc = -ENXIO;
1119 goto probe_err_dma_rx;
1120 }
1121
1122 r = platform_get_resource_byname(pdev, IORESOURCE_MEM, "korina_dma_tx");
1123 lp->tx_dma_regs = ioremap_nocache(r->start, r->end - r->start);
1124 if (!lp->tx_dma_regs) {
1125 printk(KERN_ERR DRV_NAME "cannot remap Tx DMA registers\n");
1126 rc = -ENXIO;
1127 goto probe_err_dma_tx;
1128 }
1129
1130 lp->td_ring = kmalloc(TD_RING_SIZE + RD_RING_SIZE, GFP_KERNEL);
1131 if (!lp->td_ring) {
1132 printk(KERN_ERR DRV_NAME "cannot allocate descriptors\n");
1133 rc = -ENXIO;
1134 goto probe_err_td_ring;
1135 }
1136
1137 dma_cache_inv((unsigned long)(lp->td_ring),
1138 TD_RING_SIZE + RD_RING_SIZE);
1139
1140 /* now convert TD_RING pointer to KSEG1 */
1141 lp->td_ring = (struct dma_desc *)KSEG1ADDR(lp->td_ring);
1142 lp->rd_ring = &lp->td_ring[KORINA_NUM_TDS];
1143
1144 spin_lock_init(&lp->lock);
1145 /* just use the rx dma irq */
1146 dev->irq = lp->rx_irq;
1147 lp->dev = dev;
1148
1149 dev->open = korina_open;
1150 dev->stop = korina_close;
1151 dev->hard_start_xmit = korina_send_packet;
1152 dev->set_multicast_list = &korina_multicast_list;
1153 dev->ethtool_ops = &netdev_ethtool_ops;
1154 dev->tx_timeout = korina_tx_timeout;
1155 dev->watchdog_timeo = TX_TIMEOUT;
1156 dev->do_ioctl = &korina_ioctl;
1157 #ifdef CONFIG_NET_POLL_CONTROLLER
1158 dev->poll_controller = korina_poll_controller;
1159 #endif
1160 netif_napi_add(dev, &lp->napi, korina_poll, 64);
1161
1162 lp->phy_addr = (((lp->rx_irq == 0x2c? 1:0) << 8) | 0x05);
1163 lp->mii_if.dev = dev;
1164 lp->mii_if.mdio_read = mdio_read;
1165 lp->mii_if.mdio_write = mdio_write;
1166 lp->mii_if.phy_id = lp->phy_addr;
1167 lp->mii_if.phy_id_mask = 0x1f;
1168 lp->mii_if.reg_num_mask = 0x1f;
1169
1170 rc = register_netdev(dev);
1171 if (rc < 0) {
1172 printk(KERN_ERR DRV_NAME
1173 ": cannot register net device %d\n", rc);
1174 goto probe_err_register;
1175 }
1176 out:
1177 return rc;
1178
1179 probe_err_register:
1180 kfree(lp->td_ring);
1181 probe_err_td_ring:
1182 iounmap(lp->tx_dma_regs);
1183 probe_err_dma_tx:
1184 iounmap(lp->rx_dma_regs);
1185 probe_err_dma_rx:
1186 iounmap(lp->eth_regs);
1187 probe_err_out:
1188 free_netdev(dev);
1189 goto out;
1190 }
1191
1192 static int korina_remove(struct platform_device *pdev)
1193 {
1194 struct korina_device *bif = platform_get_drvdata(pdev);
1195 struct korina_private *lp = netdev_priv(bif->dev);
1196
1197 iounmap(lp->eth_regs);
1198 iounmap(lp->rx_dma_regs);
1199 iounmap(lp->tx_dma_regs);
1200
1201 platform_set_drvdata(pdev, NULL);
1202 unregister_netdev(bif->dev);
1203 free_netdev(bif->dev);
1204
1205 return 0;
1206 }
1207
1208 static struct platform_driver korina_driver = {
1209 .driver.name = "korina",
1210 .probe = korina_probe,
1211 .remove = korina_remove,
1212 };
1213
1214 static int __init korina_init_module(void)
1215 {
1216 return platform_driver_register(&korina_driver);
1217 }
1218
1219 static void korina_cleanup_module(void)
1220 {
1221 return platform_driver_unregister(&korina_driver);
1222 }
1223
1224 module_init(korina_init_module);
1225 module_exit(korina_cleanup_module);
1226
1227 MODULE_AUTHOR("Philip Rischel <rischelp@idt.com>");
1228 MODULE_AUTHOR("Felix Fietkau <nbd@openwrt.org>");
1229 MODULE_AUTHOR("Florian Fainelli <florian@openwrt.org>");
1230 MODULE_DESCRIPTION("IDT RC32434 (Korina) Ethernet driver");
1231 MODULE_LICENSE("GPL");
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