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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/bitops.h>
59#include <asm/pgtable.h>
60#include <asm/io.h>
61#include <asm/dma.h>
62
63#include <asm/mach-rc32434/rb.h>
64#include <asm/mach-rc32434/rc32434.h>
65#include <asm/mach-rc32434/eth.h>
66#include <asm/mach-rc32434/dma_v.h>
67
68#define DRV_NAME "korina"
69#define DRV_VERSION "0.10"
70#define DRV_RELDATE "04Mar2008"
71
72#define STATION_ADDRESS_HIGH(dev) (((dev)->dev_addr[0] << 8) | \
73 ((dev)->dev_addr[1]))
74#define STATION_ADDRESS_LOW(dev) (((dev)->dev_addr[2] << 24) | \
75 ((dev)->dev_addr[3] << 16) | \
76 ((dev)->dev_addr[4] << 8) | \
77 ((dev)->dev_addr[5]))
78
79#define MII_CLOCK 1250000 /* no more than 2.5MHz */
80
81/* the following must be powers of two */
82#define KORINA_NUM_RDS 64 /* number of receive descriptors */
83#define KORINA_NUM_TDS 64 /* number of transmit descriptors */
84
85/* KORINA_RBSIZE is the hardware's default maximum receive
86 * frame size in bytes. Having this hardcoded means that there
87 * is no support for MTU sizes greater than 1500. */
88#define KORINA_RBSIZE 1536 /* size of one resource buffer = Ether MTU */
89#define KORINA_RDS_MASK (KORINA_NUM_RDS - 1)
90#define KORINA_TDS_MASK (KORINA_NUM_TDS - 1)
91#define RD_RING_SIZE (KORINA_NUM_RDS * sizeof(struct dma_desc))
92#define TD_RING_SIZE (KORINA_NUM_TDS * sizeof(struct dma_desc))
93
94#define TX_TIMEOUT (6000 * HZ / 1000)
95
96enum chain_status { desc_filled, desc_empty };
97#define IS_DMA_FINISHED(X) (((X) & (DMA_DESC_FINI)) != 0)
98#define IS_DMA_DONE(X) (((X) & (DMA_DESC_DONE)) != 0)
99#define RCVPKT_LENGTH(X) (((X) & ETH_RX_LEN) >> ETH_RX_LEN_BIT)
100
101/* Information that need to be kept for each board. */
102struct korina_private {
103 struct eth_regs *eth_regs;
104 struct dma_reg *rx_dma_regs;
105 struct dma_reg *tx_dma_regs;
106 struct dma_desc *td_ring; /* transmit descriptor ring */
107 struct dma_desc *rd_ring; /* receive descriptor ring */
108
109 struct sk_buff *tx_skb[KORINA_NUM_TDS];
110 struct sk_buff *rx_skb[KORINA_NUM_RDS];
111
112 int rx_next_done;
113 int rx_chain_head;
114 int rx_chain_tail;
115 enum chain_status rx_chain_status;
116
117 int tx_next_done;
118 int tx_chain_head;
119 int tx_chain_tail;
120 enum chain_status tx_chain_status;
121 int tx_count;
122 int tx_full;
123
124 int rx_irq;
125 int tx_irq;
126 int ovr_irq;
127 int und_irq;
128
129 spinlock_t lock; /* NIC xmit lock */
130
131 int dma_halt_cnt;
132 int dma_run_cnt;
133 struct napi_struct napi;
134 struct timer_list media_check_timer;
135 struct mii_if_info mii_if;
136 struct work_struct restart_task;
137 struct net_device *dev;
138 int phy_addr;
139};
140
141extern unsigned int idt_cpu_freq;
142
143static 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
149static 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
165static inline void korina_chain_dma(struct dma_reg *ch, u32 dma_addr)
166{
167 writel(dma_addr, &ch->dmandptr);
168}
169
170static 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
177static 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
184static 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
190static 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 */
197static 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_prev, chain_next;
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_prev = (lp->tx_chain_tail - 1) & KORINA_TDS_MASK;
235 chain_next = (lp->tx_chain_tail + 1) & 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_next;
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_prev].control &=
255 ~DMA_DESC_COF;
256 /* Link to prev */
257 lp->td_ring[chain_prev].link = CPHYSADDR(td);
258 /* Move tail */
259 lp->tx_chain_tail = chain_next;
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_next;
274 lp->tx_chain_status = desc_filled;
275 } else {
276 /* Update tail */
277 td->control = DMA_COUNT(length) |
278 DMA_DESC_COF | DMA_DESC_IOF;
279 lp->td_ring[chain_prev].control &=
280 ~DMA_DESC_COF;
281 lp->td_ring[chain_prev].link = CPHYSADDR(td);
282 lp->tx_chain_tail = chain_next;
283 }
284 }
285 dma_cache_wback((u32) td, sizeof(*td));
286
287 dev->trans_start = jiffies;
288 spin_unlock_irqrestore(&lp->lock, flags);
289
290 return NETDEV_TX_OK;
291}
292
293static int mdio_read(struct net_device *dev, int mii_id, int reg)
294{
295 struct korina_private *lp = netdev_priv(dev);
296 int ret;
297
298 mii_id = ((lp->rx_irq == 0x2c ? 1 : 0) << 8);
299
300 writel(0, &lp->eth_regs->miimcfg);
301 writel(0, &lp->eth_regs->miimcmd);
302 writel(mii_id | reg, &lp->eth_regs->miimaddr);
303 writel(ETH_MII_CMD_SCN, &lp->eth_regs->miimcmd);
304
305 ret = (int)(readl(&lp->eth_regs->miimrdd));
306 return ret;
307}
308
309static void mdio_write(struct net_device *dev, int mii_id, int reg, int val)
310{
311 struct korina_private *lp = netdev_priv(dev);
312
313 mii_id = ((lp->rx_irq == 0x2c ? 1 : 0) << 8);
314
315 writel(0, &lp->eth_regs->miimcfg);
316 writel(1, &lp->eth_regs->miimcmd);
317 writel(mii_id | reg, &lp->eth_regs->miimaddr);
318 writel(ETH_MII_CMD_SCN, &lp->eth_regs->miimcmd);
319 writel(val, &lp->eth_regs->miimwtd);
320}
321
322/* Ethernet Rx DMA interrupt */
323static irqreturn_t korina_rx_dma_interrupt(int irq, void *dev_id)
324{
325 struct net_device *dev = dev_id;
326 struct korina_private *lp = netdev_priv(dev);
327 u32 dmas, dmasm;
328 irqreturn_t retval;
329
330 dmas = readl(&lp->rx_dma_regs->dmas);
331 if (dmas & (DMA_STAT_DONE | DMA_STAT_HALT | DMA_STAT_ERR)) {
332 dmasm = readl(&lp->rx_dma_regs->dmasm);
333 writel(dmasm | (DMA_STAT_DONE |
334 DMA_STAT_HALT | DMA_STAT_ERR),
335 &lp->rx_dma_regs->dmasm);
336
337 napi_schedule(&lp->napi);
338
339 if (dmas & DMA_STAT_ERR)
340 printk(KERN_ERR "%s: DMA error\n", dev->name);
341
342 retval = IRQ_HANDLED;
343 } else
344 retval = IRQ_NONE;
345
346 return retval;
347}
348
349static int korina_rx(struct net_device *dev, int limit)
350{
351 struct korina_private *lp = netdev_priv(dev);
352 struct dma_desc *rd = &lp->rd_ring[lp->rx_next_done];
353 struct sk_buff *skb, *skb_new;
354 u8 *pkt_buf;
355 u32 devcs, pkt_len, dmas;
356 int count;
357
358 dma_cache_inv((u32)rd, sizeof(*rd));
359
360 for (count = 0; count < limit; count++) {
361 skb = lp->rx_skb[lp->rx_next_done];
362 skb_new = NULL;
363
364 devcs = rd->devcs;
365
366 if ((KORINA_RBSIZE - (u32)DMA_COUNT(rd->control)) == 0)
367 break;
368
369 /* Update statistics counters */
370 if (devcs & ETH_RX_CRC)
371 dev->stats.rx_crc_errors++;
372 if (devcs & ETH_RX_LOR)
373 dev->stats.rx_length_errors++;
374 if (devcs & ETH_RX_LE)
375 dev->stats.rx_length_errors++;
376 if (devcs & ETH_RX_OVR)
377 dev->stats.rx_fifo_errors++;
378 if (devcs & ETH_RX_CV)
379 dev->stats.rx_frame_errors++;
380 if (devcs & ETH_RX_CES)
381 dev->stats.rx_length_errors++;
382 if (devcs & ETH_RX_MP)
383 dev->stats.multicast++;
384
385 if ((devcs & ETH_RX_LD) != ETH_RX_LD) {
386 /* check that this is a whole packet
387 * WARNING: DMA_FD bit incorrectly set
388 * in Rc32434 (errata ref #077) */
389 dev->stats.rx_errors++;
390 dev->stats.rx_dropped++;
391 } else if ((devcs & ETH_RX_ROK)) {
392 pkt_len = RCVPKT_LENGTH(devcs);
393
394 /* must be the (first and) last
395 * descriptor then */
396 pkt_buf = (u8 *)lp->rx_skb[lp->rx_next_done]->data;
397
398 /* invalidate the cache */
399 dma_cache_inv((unsigned long)pkt_buf, pkt_len - 4);
400
401 /* Malloc up new buffer. */
402 skb_new = netdev_alloc_skb_ip_align(dev, KORINA_RBSIZE);
403
404 if (!skb_new)
405 break;
406 /* Do not count the CRC */
407 skb_put(skb, pkt_len - 4);
408 skb->protocol = eth_type_trans(skb, dev);
409
410 /* Pass the packet to upper layers */
411 netif_receive_skb(skb);
412 dev->stats.rx_packets++;
413 dev->stats.rx_bytes += pkt_len;
414
415 /* Update the mcast stats */
416 if (devcs & ETH_RX_MP)
417 dev->stats.multicast++;
418
419 lp->rx_skb[lp->rx_next_done] = skb_new;
420 }
421
422 rd->devcs = 0;
423
424 /* Restore descriptor's curr_addr */
425 if (skb_new)
426 rd->ca = CPHYSADDR(skb_new->data);
427 else
428 rd->ca = CPHYSADDR(skb->data);
429
430 rd->control = DMA_COUNT(KORINA_RBSIZE) |
431 DMA_DESC_COD | DMA_DESC_IOD;
432 lp->rd_ring[(lp->rx_next_done - 1) &
433 KORINA_RDS_MASK].control &=
434 ~DMA_DESC_COD;
435
436 lp->rx_next_done = (lp->rx_next_done + 1) & KORINA_RDS_MASK;
437 dma_cache_wback((u32)rd, sizeof(*rd));
438 rd = &lp->rd_ring[lp->rx_next_done];
439 writel(~DMA_STAT_DONE, &lp->rx_dma_regs->dmas);
440 }
441
442 dmas = readl(&lp->rx_dma_regs->dmas);
443
444 if (dmas & DMA_STAT_HALT) {
445 writel(~(DMA_STAT_HALT | DMA_STAT_ERR),
446 &lp->rx_dma_regs->dmas);
447
448 lp->dma_halt_cnt++;
449 rd->devcs = 0;
450 skb = lp->rx_skb[lp->rx_next_done];
451 rd->ca = CPHYSADDR(skb->data);
452 dma_cache_wback((u32)rd, sizeof(*rd));
453 korina_chain_rx(lp, rd);
454 }
455
456 return count;
457}
458
459static int korina_poll(struct napi_struct *napi, int budget)
460{
461 struct korina_private *lp =
462 container_of(napi, struct korina_private, napi);
463 struct net_device *dev = lp->dev;
464 int work_done;
465
466 work_done = korina_rx(dev, budget);
467 if (work_done < budget) {
468 napi_complete(napi);
469
470 writel(readl(&lp->rx_dma_regs->dmasm) &
471 ~(DMA_STAT_DONE | DMA_STAT_HALT | DMA_STAT_ERR),
472 &lp->rx_dma_regs->dmasm);
473 }
474 return work_done;
475}
476
477/*
478 * Set or clear the multicast filter for this adaptor.
479 */
480static void korina_multicast_list(struct net_device *dev)
481{
482 struct korina_private *lp = netdev_priv(dev);
483 unsigned long flags;
484 struct netdev_hw_addr *ha;
485 u32 recognise = ETH_ARC_AB; /* always accept broadcasts */
486 int i;
487
488 /* Set promiscuous mode */
489 if (dev->flags & IFF_PROMISC)
490 recognise |= ETH_ARC_PRO;
491
492 else if ((dev->flags & IFF_ALLMULTI) || (netdev_mc_count(dev) > 4))
493 /* All multicast and broadcast */
494 recognise |= ETH_ARC_AM;
495
496 /* Build the hash table */
497 if (netdev_mc_count(dev) > 4) {
498 u16 hash_table[4];
499 u32 crc;
500
501 for (i = 0; i < 4; i++)
502 hash_table[i] = 0;
503
504 netdev_for_each_mc_addr(ha, dev) {
505 crc = ether_crc_le(6, ha->addr);
506 crc >>= 26;
507 hash_table[crc >> 4] |= 1 << (15 - (crc & 0xf));
508 }
509 /* Accept filtered multicast */
510 recognise |= ETH_ARC_AFM;
511
512 /* Fill the MAC hash tables with their values */
513 writel((u32)(hash_table[1] << 16 | hash_table[0]),
514 &lp->eth_regs->ethhash0);
515 writel((u32)(hash_table[3] << 16 | hash_table[2]),
516 &lp->eth_regs->ethhash1);
517 }
518
519 spin_lock_irqsave(&lp->lock, flags);
520 writel(recognise, &lp->eth_regs->etharc);
521 spin_unlock_irqrestore(&lp->lock, flags);
522}
523
524static void korina_tx(struct net_device *dev)
525{
526 struct korina_private *lp = netdev_priv(dev);
527 struct dma_desc *td = &lp->td_ring[lp->tx_next_done];
528 u32 devcs;
529 u32 dmas;
530
531 spin_lock(&lp->lock);
532
533 /* Process all desc that are done */
534 while (IS_DMA_FINISHED(td->control)) {
535 if (lp->tx_full == 1) {
536 netif_wake_queue(dev);
537 lp->tx_full = 0;
538 }
539
540 devcs = lp->td_ring[lp->tx_next_done].devcs;
541 if ((devcs & (ETH_TX_FD | ETH_TX_LD)) !=
542 (ETH_TX_FD | ETH_TX_LD)) {
543 dev->stats.tx_errors++;
544 dev->stats.tx_dropped++;
545
546 /* Should never happen */
547 printk(KERN_ERR "%s: split tx ignored\n",
548 dev->name);
549 } else if (devcs & ETH_TX_TOK) {
550 dev->stats.tx_packets++;
551 dev->stats.tx_bytes +=
552 lp->tx_skb[lp->tx_next_done]->len;
553 } else {
554 dev->stats.tx_errors++;
555 dev->stats.tx_dropped++;
556
557 /* Underflow */
558 if (devcs & ETH_TX_UND)
559 dev->stats.tx_fifo_errors++;
560
561 /* Oversized frame */
562 if (devcs & ETH_TX_OF)
563 dev->stats.tx_aborted_errors++;
564
565 /* Excessive deferrals */
566 if (devcs & ETH_TX_ED)
567 dev->stats.tx_carrier_errors++;
568
569 /* Collisions: medium busy */
570 if (devcs & ETH_TX_EC)
571 dev->stats.collisions++;
572
573 /* Late collision */
574 if (devcs & ETH_TX_LC)
575 dev->stats.tx_window_errors++;
576 }
577
578 /* We must always free the original skb */
579 if (lp->tx_skb[lp->tx_next_done]) {
580 dev_kfree_skb_any(lp->tx_skb[lp->tx_next_done]);
581 lp->tx_skb[lp->tx_next_done] = NULL;
582 }
583
584 lp->td_ring[lp->tx_next_done].control = DMA_DESC_IOF;
585 lp->td_ring[lp->tx_next_done].devcs = ETH_TX_FD | ETH_TX_LD;
586 lp->td_ring[lp->tx_next_done].link = 0;
587 lp->td_ring[lp->tx_next_done].ca = 0;
588 lp->tx_count--;
589
590 /* Go on to next transmission */
591 lp->tx_next_done = (lp->tx_next_done + 1) & KORINA_TDS_MASK;
592 td = &lp->td_ring[lp->tx_next_done];
593
594 }
595
596 /* Clear the DMA status register */
597 dmas = readl(&lp->tx_dma_regs->dmas);
598 writel(~dmas, &lp->tx_dma_regs->dmas);
599
600 writel(readl(&lp->tx_dma_regs->dmasm) &
601 ~(DMA_STAT_FINI | DMA_STAT_ERR),
602 &lp->tx_dma_regs->dmasm);
603
604 spin_unlock(&lp->lock);
605}
606
607static irqreturn_t
608korina_tx_dma_interrupt(int irq, void *dev_id)
609{
610 struct net_device *dev = dev_id;
611 struct korina_private *lp = netdev_priv(dev);
612 u32 dmas, dmasm;
613 irqreturn_t retval;
614
615 dmas = readl(&lp->tx_dma_regs->dmas);
616
617 if (dmas & (DMA_STAT_FINI | DMA_STAT_ERR)) {
618 dmasm = readl(&lp->tx_dma_regs->dmasm);
619 writel(dmasm | (DMA_STAT_FINI | DMA_STAT_ERR),
620 &lp->tx_dma_regs->dmasm);
621
622 korina_tx(dev);
623
624 if (lp->tx_chain_status == desc_filled &&
625 (readl(&(lp->tx_dma_regs->dmandptr)) == 0)) {
626 writel(CPHYSADDR(&lp->td_ring[lp->tx_chain_head]),
627 &(lp->tx_dma_regs->dmandptr));
628 lp->tx_chain_status = desc_empty;
629 lp->tx_chain_head = lp->tx_chain_tail;
630 dev->trans_start = jiffies;
631 }
632 if (dmas & DMA_STAT_ERR)
633 printk(KERN_ERR "%s: DMA error\n", dev->name);
634
635 retval = IRQ_HANDLED;
636 } else
637 retval = IRQ_NONE;
638
639 return retval;
640}
641
642
643static void korina_check_media(struct net_device *dev, unsigned int init_media)
644{
645 struct korina_private *lp = netdev_priv(dev);
646
647 mii_check_media(&lp->mii_if, 0, init_media);
648
649 if (lp->mii_if.full_duplex)
650 writel(readl(&lp->eth_regs->ethmac2) | ETH_MAC2_FD,
651 &lp->eth_regs->ethmac2);
652 else
653 writel(readl(&lp->eth_regs->ethmac2) & ~ETH_MAC2_FD,
654 &lp->eth_regs->ethmac2);
655}
656
657static void korina_poll_media(unsigned long data)
658{
659 struct net_device *dev = (struct net_device *) data;
660 struct korina_private *lp = netdev_priv(dev);
661
662 korina_check_media(dev, 0);
663 mod_timer(&lp->media_check_timer, jiffies + HZ);
664}
665
666static void korina_set_carrier(struct mii_if_info *mii)
667{
668 if (mii->force_media) {
669 /* autoneg is off: Link is always assumed to be up */
670 if (!netif_carrier_ok(mii->dev))
671 netif_carrier_on(mii->dev);
672 } else /* Let MMI library update carrier status */
673 korina_check_media(mii->dev, 0);
674}
675
676static int korina_ioctl(struct net_device *dev, struct ifreq *rq, int cmd)
677{
678 struct korina_private *lp = netdev_priv(dev);
679 struct mii_ioctl_data *data = if_mii(rq);
680 int rc;
681
682 if (!netif_running(dev))
683 return -EINVAL;
684 spin_lock_irq(&lp->lock);
685 rc = generic_mii_ioctl(&lp->mii_if, data, cmd, NULL);
686 spin_unlock_irq(&lp->lock);
687 korina_set_carrier(&lp->mii_if);
688
689 return rc;
690}
691
692/* ethtool helpers */
693static void netdev_get_drvinfo(struct net_device *dev,
694 struct ethtool_drvinfo *info)
695{
696 struct korina_private *lp = netdev_priv(dev);
697
698 strcpy(info->driver, DRV_NAME);
699 strcpy(info->version, DRV_VERSION);
700 strcpy(info->bus_info, lp->dev->name);
701}
702
703static int netdev_get_settings(struct net_device *dev, struct ethtool_cmd *cmd)
704{
705 struct korina_private *lp = netdev_priv(dev);
706 int rc;
707
708 spin_lock_irq(&lp->lock);
709 rc = mii_ethtool_gset(&lp->mii_if, cmd);
710 spin_unlock_irq(&lp->lock);
711
712 return rc;
713}
714
715static int netdev_set_settings(struct net_device *dev, struct ethtool_cmd *cmd)
716{
717 struct korina_private *lp = netdev_priv(dev);
718 int rc;
719
720 spin_lock_irq(&lp->lock);
721 rc = mii_ethtool_sset(&lp->mii_if, cmd);
722 spin_unlock_irq(&lp->lock);
723 korina_set_carrier(&lp->mii_if);
724
725 return rc;
726}
727
728static u32 netdev_get_link(struct net_device *dev)
729{
730 struct korina_private *lp = netdev_priv(dev);
731
732 return mii_link_ok(&lp->mii_if);
733}
734
735static const struct ethtool_ops netdev_ethtool_ops = {
736 .get_drvinfo = netdev_get_drvinfo,
737 .get_settings = netdev_get_settings,
738 .set_settings = netdev_set_settings,
739 .get_link = netdev_get_link,
740};
741
742static int korina_alloc_ring(struct net_device *dev)
743{
744 struct korina_private *lp = netdev_priv(dev);
745 struct sk_buff *skb;
746 int i;
747
748 /* Initialize the transmit descriptors */
749 for (i = 0; i < KORINA_NUM_TDS; i++) {
750 lp->td_ring[i].control = DMA_DESC_IOF;
751 lp->td_ring[i].devcs = ETH_TX_FD | ETH_TX_LD;
752 lp->td_ring[i].ca = 0;
753 lp->td_ring[i].link = 0;
754 }
755 lp->tx_next_done = lp->tx_chain_head = lp->tx_chain_tail =
756 lp->tx_full = lp->tx_count = 0;
757 lp->tx_chain_status = desc_empty;
758
759 /* Initialize the receive descriptors */
760 for (i = 0; i < KORINA_NUM_RDS; i++) {
761 skb = netdev_alloc_skb_ip_align(dev, KORINA_RBSIZE);
762 if (!skb)
763 return -ENOMEM;
764 lp->rx_skb[i] = skb;
765 lp->rd_ring[i].control = DMA_DESC_IOD |
766 DMA_COUNT(KORINA_RBSIZE);
767 lp->rd_ring[i].devcs = 0;
768 lp->rd_ring[i].ca = CPHYSADDR(skb->data);
769 lp->rd_ring[i].link = CPHYSADDR(&lp->rd_ring[i+1]);
770 }
771
772 /* loop back receive descriptors, so the last
773 * descriptor points to the first one */
774 lp->rd_ring[i - 1].link = CPHYSADDR(&lp->rd_ring[0]);
775 lp->rd_ring[i - 1].control |= DMA_DESC_COD;
776
777 lp->rx_next_done = 0;
778 lp->rx_chain_head = 0;
779 lp->rx_chain_tail = 0;
780 lp->rx_chain_status = desc_empty;
781
782 return 0;
783}
784
785static void korina_free_ring(struct net_device *dev)
786{
787 struct korina_private *lp = netdev_priv(dev);
788 int i;
789
790 for (i = 0; i < KORINA_NUM_RDS; i++) {
791 lp->rd_ring[i].control = 0;
792 if (lp->rx_skb[i])
793 dev_kfree_skb_any(lp->rx_skb[i]);
794 lp->rx_skb[i] = NULL;
795 }
796
797 for (i = 0; i < KORINA_NUM_TDS; i++) {
798 lp->td_ring[i].control = 0;
799 if (lp->tx_skb[i])
800 dev_kfree_skb_any(lp->tx_skb[i]);
801 lp->tx_skb[i] = NULL;
802 }
803}
804
805/*
806 * Initialize the RC32434 ethernet controller.
807 */
808static int korina_init(struct net_device *dev)
809{
810 struct korina_private *lp = netdev_priv(dev);
811
812 /* Disable DMA */
813 korina_abort_tx(dev);
814 korina_abort_rx(dev);
815
816 /* reset ethernet logic */
817 writel(0, &lp->eth_regs->ethintfc);
818 while ((readl(&lp->eth_regs->ethintfc) & ETH_INT_FC_RIP))
819 dev->trans_start = jiffies;
820
821 /* Enable Ethernet Interface */
822 writel(ETH_INT_FC_EN, &lp->eth_regs->ethintfc);
823
824 /* Allocate rings */
825 if (korina_alloc_ring(dev)) {
826 printk(KERN_ERR "%s: descriptor allocation failed\n", dev->name);
827 korina_free_ring(dev);
828 return -ENOMEM;
829 }
830
831 writel(0, &lp->rx_dma_regs->dmas);
832 /* Start Rx DMA */
833 korina_start_rx(lp, &lp->rd_ring[0]);
834
835 writel(readl(&lp->tx_dma_regs->dmasm) &
836 ~(DMA_STAT_FINI | DMA_STAT_ERR),
837 &lp->tx_dma_regs->dmasm);
838 writel(readl(&lp->rx_dma_regs->dmasm) &
839 ~(DMA_STAT_DONE | DMA_STAT_HALT | DMA_STAT_ERR),
840 &lp->rx_dma_regs->dmasm);
841
842 /* Accept only packets destined for this Ethernet device address */
843 writel(ETH_ARC_AB, &lp->eth_regs->etharc);
844
845 /* Set all Ether station address registers to their initial values */
846 writel(STATION_ADDRESS_LOW(dev), &lp->eth_regs->ethsal0);
847 writel(STATION_ADDRESS_HIGH(dev), &lp->eth_regs->ethsah0);
848
849 writel(STATION_ADDRESS_LOW(dev), &lp->eth_regs->ethsal1);
850 writel(STATION_ADDRESS_HIGH(dev), &lp->eth_regs->ethsah1);
851
852 writel(STATION_ADDRESS_LOW(dev), &lp->eth_regs->ethsal2);
853 writel(STATION_ADDRESS_HIGH(dev), &lp->eth_regs->ethsah2);
854
855 writel(STATION_ADDRESS_LOW(dev), &lp->eth_regs->ethsal3);
856 writel(STATION_ADDRESS_HIGH(dev), &lp->eth_regs->ethsah3);
857
858
859 /* Frame Length Checking, Pad Enable, CRC Enable, Full Duplex set */
860 writel(ETH_MAC2_PE | ETH_MAC2_CEN | ETH_MAC2_FD,
861 &lp->eth_regs->ethmac2);
862
863 /* Back to back inter-packet-gap */
864 writel(0x15, &lp->eth_regs->ethipgt);
865 /* Non - Back to back inter-packet-gap */
866 writel(0x12, &lp->eth_regs->ethipgr);
867
868 /* Management Clock Prescaler Divisor
869 * Clock independent setting */
870 writel(((idt_cpu_freq) / MII_CLOCK + 1) & ~1,
871 &lp->eth_regs->ethmcp);
872
873 /* don't transmit until fifo contains 48b */
874 writel(48, &lp->eth_regs->ethfifott);
875
876 writel(ETH_MAC1_RE, &lp->eth_regs->ethmac1);
877
878 napi_enable(&lp->napi);
879 netif_start_queue(dev);
880
881 return 0;
882}
883
884/*
885 * Restart the RC32434 ethernet controller.
886 */
887static void korina_restart_task(struct work_struct *work)
888{
889 struct korina_private *lp = container_of(work,
890 struct korina_private, restart_task);
891 struct net_device *dev = lp->dev;
892
893 /*
894 * Disable interrupts
895 */
896 disable_irq(lp->rx_irq);
897 disable_irq(lp->tx_irq);
898 disable_irq(lp->ovr_irq);
899 disable_irq(lp->und_irq);
900
901 writel(readl(&lp->tx_dma_regs->dmasm) |
902 DMA_STAT_FINI | DMA_STAT_ERR,
903 &lp->tx_dma_regs->dmasm);
904 writel(readl(&lp->rx_dma_regs->dmasm) |
905 DMA_STAT_DONE | DMA_STAT_HALT | DMA_STAT_ERR,
906 &lp->rx_dma_regs->dmasm);
907
908 korina_free_ring(dev);
909
910 napi_disable(&lp->napi);
911
912 if (korina_init(dev) < 0) {
913 printk(KERN_ERR "%s: cannot restart device\n", dev->name);
914 return;
915 }
916 korina_multicast_list(dev);
917
918 enable_irq(lp->und_irq);
919 enable_irq(lp->ovr_irq);
920 enable_irq(lp->tx_irq);
921 enable_irq(lp->rx_irq);
922}
923
924static void korina_clear_and_restart(struct net_device *dev, u32 value)
925{
926 struct korina_private *lp = netdev_priv(dev);
927
928 netif_stop_queue(dev);
929 writel(value, &lp->eth_regs->ethintfc);
930 schedule_work(&lp->restart_task);
931}
932
933/* Ethernet Tx Underflow interrupt */
934static irqreturn_t korina_und_interrupt(int irq, void *dev_id)
935{
936 struct net_device *dev = dev_id;
937 struct korina_private *lp = netdev_priv(dev);
938 unsigned int und;
939
940 spin_lock(&lp->lock);
941
942 und = readl(&lp->eth_regs->ethintfc);
943
944 if (und & ETH_INT_FC_UND)
945 korina_clear_and_restart(dev, und & ~ETH_INT_FC_UND);
946
947 spin_unlock(&lp->lock);
948
949 return IRQ_HANDLED;
950}
951
952static void korina_tx_timeout(struct net_device *dev)
953{
954 struct korina_private *lp = netdev_priv(dev);
955
956 schedule_work(&lp->restart_task);
957}
958
959/* Ethernet Rx Overflow interrupt */
960static irqreturn_t
961korina_ovr_interrupt(int irq, void *dev_id)
962{
963 struct net_device *dev = dev_id;
964 struct korina_private *lp = netdev_priv(dev);
965 unsigned int ovr;
966
967 spin_lock(&lp->lock);
968 ovr = readl(&lp->eth_regs->ethintfc);
969
970 if (ovr & ETH_INT_FC_OVR)
971 korina_clear_and_restart(dev, ovr & ~ETH_INT_FC_OVR);
972
973 spin_unlock(&lp->lock);
974
975 return IRQ_HANDLED;
976}
977
978#ifdef CONFIG_NET_POLL_CONTROLLER
979static void korina_poll_controller(struct net_device *dev)
980{
981 disable_irq(dev->irq);
982 korina_tx_dma_interrupt(dev->irq, dev);
983 enable_irq(dev->irq);
984}
985#endif
986
987static int korina_open(struct net_device *dev)
988{
989 struct korina_private *lp = netdev_priv(dev);
990 int ret;
991
992 /* Initialize */
993 ret = korina_init(dev);
994 if (ret < 0) {
995 printk(KERN_ERR "%s: cannot open device\n", dev->name);
996 goto out;
997 }
998
999 /* Install the interrupt handler
1000 * that handles the Done Finished
1001 * Ovr and Und Events */
1002 ret = request_irq(lp->rx_irq, korina_rx_dma_interrupt,
1003 IRQF_DISABLED, "Korina ethernet Rx", dev);
1004 if (ret < 0) {
1005 printk(KERN_ERR "%s: unable to get Rx DMA IRQ %d\n",
1006 dev->name, lp->rx_irq);
1007 goto err_release;
1008 }
1009 ret = request_irq(lp->tx_irq, korina_tx_dma_interrupt,
1010 IRQF_DISABLED, "Korina ethernet Tx", dev);
1011 if (ret < 0) {
1012 printk(KERN_ERR "%s: unable to get Tx DMA IRQ %d\n",
1013 dev->name, lp->tx_irq);
1014 goto err_free_rx_irq;
1015 }
1016
1017 /* Install handler for overrun error. */
1018 ret = request_irq(lp->ovr_irq, korina_ovr_interrupt,
1019 IRQF_DISABLED, "Ethernet Overflow", dev);
1020 if (ret < 0) {
1021 printk(KERN_ERR "%s: unable to get OVR IRQ %d\n",
1022 dev->name, lp->ovr_irq);
1023 goto err_free_tx_irq;
1024 }
1025
1026 /* Install handler for underflow error. */
1027 ret = request_irq(lp->und_irq, korina_und_interrupt,
1028 IRQF_DISABLED, "Ethernet Underflow", dev);
1029 if (ret < 0) {
1030 printk(KERN_ERR "%s: unable to get UND IRQ %d\n",
1031 dev->name, lp->und_irq);
1032 goto err_free_ovr_irq;
1033 }
1034 mod_timer(&lp->media_check_timer, jiffies + 1);
1035out:
1036 return ret;
1037
1038err_free_ovr_irq:
1039 free_irq(lp->ovr_irq, dev);
1040err_free_tx_irq:
1041 free_irq(lp->tx_irq, dev);
1042err_free_rx_irq:
1043 free_irq(lp->rx_irq, dev);
1044err_release:
1045 korina_free_ring(dev);
1046 goto out;
1047}
1048
1049static int korina_close(struct net_device *dev)
1050{
1051 struct korina_private *lp = netdev_priv(dev);
1052 u32 tmp;
1053
1054 del_timer(&lp->media_check_timer);
1055
1056 /* Disable interrupts */
1057 disable_irq(lp->rx_irq);
1058 disable_irq(lp->tx_irq);
1059 disable_irq(lp->ovr_irq);
1060 disable_irq(lp->und_irq);
1061
1062 korina_abort_tx(dev);
1063 tmp = readl(&lp->tx_dma_regs->dmasm);
1064 tmp = tmp | DMA_STAT_FINI | DMA_STAT_ERR;
1065 writel(tmp, &lp->tx_dma_regs->dmasm);
1066
1067 korina_abort_rx(dev);
1068 tmp = readl(&lp->rx_dma_regs->dmasm);
1069 tmp = tmp | DMA_STAT_DONE | DMA_STAT_HALT | DMA_STAT_ERR;
1070 writel(tmp, &lp->rx_dma_regs->dmasm);
1071
1072 korina_free_ring(dev);
1073
1074 napi_disable(&lp->napi);
1075
1076 cancel_work_sync(&lp->restart_task);
1077
1078 free_irq(lp->rx_irq, dev);
1079 free_irq(lp->tx_irq, dev);
1080 free_irq(lp->ovr_irq, dev);
1081 free_irq(lp->und_irq, dev);
1082
1083 return 0;
1084}
1085
1086static const struct net_device_ops korina_netdev_ops = {
1087 .ndo_open = korina_open,
1088 .ndo_stop = korina_close,
1089 .ndo_start_xmit = korina_send_packet,
1090 .ndo_set_rx_mode = korina_multicast_list,
1091 .ndo_tx_timeout = korina_tx_timeout,
1092 .ndo_do_ioctl = korina_ioctl,
1093 .ndo_change_mtu = eth_change_mtu,
1094 .ndo_validate_addr = eth_validate_addr,
1095 .ndo_set_mac_address = eth_mac_addr,
1096#ifdef CONFIG_NET_POLL_CONTROLLER
1097 .ndo_poll_controller = korina_poll_controller,
1098#endif
1099};
1100
1101static int korina_probe(struct platform_device *pdev)
1102{
1103 struct korina_device *bif = platform_get_drvdata(pdev);
1104 struct korina_private *lp;
1105 struct net_device *dev;
1106 struct resource *r;
1107 int rc;
1108
1109 dev = alloc_etherdev(sizeof(struct korina_private));
1110 if (!dev)
1111 return -ENOMEM;
1112
1113 SET_NETDEV_DEV(dev, &pdev->dev);
1114 lp = netdev_priv(dev);
1115
1116 bif->dev = dev;
1117 memcpy(dev->dev_addr, bif->mac, 6);
1118
1119 lp->rx_irq = platform_get_irq_byname(pdev, "korina_rx");
1120 lp->tx_irq = platform_get_irq_byname(pdev, "korina_tx");
1121 lp->ovr_irq = platform_get_irq_byname(pdev, "korina_ovr");
1122 lp->und_irq = platform_get_irq_byname(pdev, "korina_und");
1123
1124 r = platform_get_resource_byname(pdev, IORESOURCE_MEM, "korina_regs");
1125 dev->base_addr = r->start;
1126 lp->eth_regs = ioremap_nocache(r->start, resource_size(r));
1127 if (!lp->eth_regs) {
1128 printk(KERN_ERR DRV_NAME ": cannot remap registers\n");
1129 rc = -ENXIO;
1130 goto probe_err_out;
1131 }
1132
1133 r = platform_get_resource_byname(pdev, IORESOURCE_MEM, "korina_dma_rx");
1134 lp->rx_dma_regs = ioremap_nocache(r->start, resource_size(r));
1135 if (!lp->rx_dma_regs) {
1136 printk(KERN_ERR DRV_NAME ": cannot remap Rx DMA registers\n");
1137 rc = -ENXIO;
1138 goto probe_err_dma_rx;
1139 }
1140
1141 r = platform_get_resource_byname(pdev, IORESOURCE_MEM, "korina_dma_tx");
1142 lp->tx_dma_regs = ioremap_nocache(r->start, resource_size(r));
1143 if (!lp->tx_dma_regs) {
1144 printk(KERN_ERR DRV_NAME ": cannot remap Tx DMA registers\n");
1145 rc = -ENXIO;
1146 goto probe_err_dma_tx;
1147 }
1148
1149 lp->td_ring = kmalloc(TD_RING_SIZE + RD_RING_SIZE, GFP_KERNEL);
1150 if (!lp->td_ring) {
1151 rc = -ENXIO;
1152 goto probe_err_td_ring;
1153 }
1154
1155 dma_cache_inv((unsigned long)(lp->td_ring),
1156 TD_RING_SIZE + RD_RING_SIZE);
1157
1158 /* now convert TD_RING pointer to KSEG1 */
1159 lp->td_ring = (struct dma_desc *)KSEG1ADDR(lp->td_ring);
1160 lp->rd_ring = &lp->td_ring[KORINA_NUM_TDS];
1161
1162 spin_lock_init(&lp->lock);
1163 /* just use the rx dma irq */
1164 dev->irq = lp->rx_irq;
1165 lp->dev = dev;
1166
1167 dev->netdev_ops = &korina_netdev_ops;
1168 dev->ethtool_ops = &netdev_ethtool_ops;
1169 dev->watchdog_timeo = TX_TIMEOUT;
1170 netif_napi_add(dev, &lp->napi, korina_poll, 64);
1171
1172 lp->phy_addr = (((lp->rx_irq == 0x2c? 1:0) << 8) | 0x05);
1173 lp->mii_if.dev = dev;
1174 lp->mii_if.mdio_read = mdio_read;
1175 lp->mii_if.mdio_write = mdio_write;
1176 lp->mii_if.phy_id = lp->phy_addr;
1177 lp->mii_if.phy_id_mask = 0x1f;
1178 lp->mii_if.reg_num_mask = 0x1f;
1179
1180 rc = register_netdev(dev);
1181 if (rc < 0) {
1182 printk(KERN_ERR DRV_NAME
1183 ": cannot register net device: %d\n", rc);
1184 goto probe_err_register;
1185 }
1186 setup_timer(&lp->media_check_timer, korina_poll_media, (unsigned long) dev);
1187
1188 INIT_WORK(&lp->restart_task, korina_restart_task);
1189
1190 printk(KERN_INFO "%s: " DRV_NAME "-" DRV_VERSION " " DRV_RELDATE "\n",
1191 dev->name);
1192out:
1193 return rc;
1194
1195probe_err_register:
1196 kfree(lp->td_ring);
1197probe_err_td_ring:
1198 iounmap(lp->tx_dma_regs);
1199probe_err_dma_tx:
1200 iounmap(lp->rx_dma_regs);
1201probe_err_dma_rx:
1202 iounmap(lp->eth_regs);
1203probe_err_out:
1204 free_netdev(dev);
1205 goto out;
1206}
1207
1208static int korina_remove(struct platform_device *pdev)
1209{
1210 struct korina_device *bif = platform_get_drvdata(pdev);
1211 struct korina_private *lp = netdev_priv(bif->dev);
1212
1213 iounmap(lp->eth_regs);
1214 iounmap(lp->rx_dma_regs);
1215 iounmap(lp->tx_dma_regs);
1216
1217 platform_set_drvdata(pdev, NULL);
1218 unregister_netdev(bif->dev);
1219 free_netdev(bif->dev);
1220
1221 return 0;
1222}
1223
1224static struct platform_driver korina_driver = {
1225 .driver.name = "korina",
1226 .probe = korina_probe,
1227 .remove = korina_remove,
1228};
1229
1230module_platform_driver(korina_driver);
1231
1232MODULE_AUTHOR("Philip Rischel <rischelp@idt.com>");
1233MODULE_AUTHOR("Felix Fietkau <nbd@openwrt.org>");
1234MODULE_AUTHOR("Florian Fainelli <florian@openwrt.org>");
1235MODULE_DESCRIPTION("IDT RC32434 (Korina) Ethernet driver");
1236MODULE_LICENSE("GPL");