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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 * Copyright 2017 Roman Yeryomin <roman@advem.lv>
8 *
9 * This program is free software; you can redistribute it and/or modify it
10 * under the terms of the GNU General Public License as published by the
11 * Free Software Foundation; either version 2 of the License, or (at your
12 * option) any later version.
13 *
14 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
15 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
16 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN
17 * NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
18 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
19 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
20 * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
21 * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
22 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
23 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
24 *
25 * You should have received a copy of the GNU General Public License along
26 * with this program; if not, write to the Free Software Foundation, Inc.,
27 * 675 Mass Ave, Cambridge, MA 02139, USA.
28 *
29 * Writing to a DMA status register:
30 *
31 * When writing to the status register, you should mask the bit you have
32 * been testing the status register with. Both Tx and Rx DMA registers
33 * should stick to this procedure.
34 */
35
36#include <linux/module.h>
37#include <linux/kernel.h>
38#include <linux/moduleparam.h>
39#include <linux/sched.h>
40#include <linux/ctype.h>
41#include <linux/types.h>
42#include <linux/interrupt.h>
43#include <linux/ioport.h>
44#include <linux/iopoll.h>
45#include <linux/in.h>
46#include <linux/of.h>
47#include <linux/of_net.h>
48#include <linux/slab.h>
49#include <linux/string.h>
50#include <linux/delay.h>
51#include <linux/netdevice.h>
52#include <linux/etherdevice.h>
53#include <linux/skbuff.h>
54#include <linux/errno.h>
55#include <linux/platform_device.h>
56#include <linux/mii.h>
57#include <linux/ethtool.h>
58#include <linux/crc32.h>
59#include <linux/pgtable.h>
60#include <linux/clk.h>
61
62#define DRV_NAME "korina"
63#define DRV_VERSION "0.20"
64#define DRV_RELDATE "15Sep2017"
65
66struct eth_regs {
67 u32 ethintfc;
68 u32 ethfifott;
69 u32 etharc;
70 u32 ethhash0;
71 u32 ethhash1;
72 u32 ethu0[4]; /* Reserved. */
73 u32 ethpfs;
74 u32 ethmcp;
75 u32 eth_u1[10]; /* Reserved. */
76 u32 ethspare;
77 u32 eth_u2[42]; /* Reserved. */
78 u32 ethsal0;
79 u32 ethsah0;
80 u32 ethsal1;
81 u32 ethsah1;
82 u32 ethsal2;
83 u32 ethsah2;
84 u32 ethsal3;
85 u32 ethsah3;
86 u32 ethrbc;
87 u32 ethrpc;
88 u32 ethrupc;
89 u32 ethrfc;
90 u32 ethtbc;
91 u32 ethgpf;
92 u32 eth_u9[50]; /* Reserved. */
93 u32 ethmac1;
94 u32 ethmac2;
95 u32 ethipgt;
96 u32 ethipgr;
97 u32 ethclrt;
98 u32 ethmaxf;
99 u32 eth_u10; /* Reserved. */
100 u32 ethmtest;
101 u32 miimcfg;
102 u32 miimcmd;
103 u32 miimaddr;
104 u32 miimwtd;
105 u32 miimrdd;
106 u32 miimind;
107 u32 eth_u11; /* Reserved. */
108 u32 eth_u12; /* Reserved. */
109 u32 ethcfsa0;
110 u32 ethcfsa1;
111 u32 ethcfsa2;
112};
113
114/* Ethernet interrupt registers */
115#define ETH_INT_FC_EN BIT(0)
116#define ETH_INT_FC_ITS BIT(1)
117#define ETH_INT_FC_RIP BIT(2)
118#define ETH_INT_FC_JAM BIT(3)
119#define ETH_INT_FC_OVR BIT(4)
120#define ETH_INT_FC_UND BIT(5)
121#define ETH_INT_FC_IOC 0x000000c0
122
123/* Ethernet FIFO registers */
124#define ETH_FIFI_TT_TTH_BIT 0
125#define ETH_FIFO_TT_TTH 0x0000007f
126
127/* Ethernet ARC/multicast registers */
128#define ETH_ARC_PRO BIT(0)
129#define ETH_ARC_AM BIT(1)
130#define ETH_ARC_AFM BIT(2)
131#define ETH_ARC_AB BIT(3)
132
133/* Ethernet SAL registers */
134#define ETH_SAL_BYTE_5 0x000000ff
135#define ETH_SAL_BYTE_4 0x0000ff00
136#define ETH_SAL_BYTE_3 0x00ff0000
137#define ETH_SAL_BYTE_2 0xff000000
138
139/* Ethernet SAH registers */
140#define ETH_SAH_BYTE1 0x000000ff
141#define ETH_SAH_BYTE0 0x0000ff00
142
143/* Ethernet GPF register */
144#define ETH_GPF_PTV 0x0000ffff
145
146/* Ethernet PFG register */
147#define ETH_PFS_PFD BIT(0)
148
149/* Ethernet CFSA[0-3] registers */
150#define ETH_CFSA0_CFSA4 0x000000ff
151#define ETH_CFSA0_CFSA5 0x0000ff00
152#define ETH_CFSA1_CFSA2 0x000000ff
153#define ETH_CFSA1_CFSA3 0x0000ff00
154#define ETH_CFSA1_CFSA0 0x000000ff
155#define ETH_CFSA1_CFSA1 0x0000ff00
156
157/* Ethernet MAC1 registers */
158#define ETH_MAC1_RE BIT(0)
159#define ETH_MAC1_PAF BIT(1)
160#define ETH_MAC1_RFC BIT(2)
161#define ETH_MAC1_TFC BIT(3)
162#define ETH_MAC1_LB BIT(4)
163#define ETH_MAC1_MR BIT(31)
164
165/* Ethernet MAC2 registers */
166#define ETH_MAC2_FD BIT(0)
167#define ETH_MAC2_FLC BIT(1)
168#define ETH_MAC2_HFE BIT(2)
169#define ETH_MAC2_DC BIT(3)
170#define ETH_MAC2_CEN BIT(4)
171#define ETH_MAC2_PE BIT(5)
172#define ETH_MAC2_VPE BIT(6)
173#define ETH_MAC2_APE BIT(7)
174#define ETH_MAC2_PPE BIT(8)
175#define ETH_MAC2_LPE BIT(9)
176#define ETH_MAC2_NB BIT(12)
177#define ETH_MAC2_BP BIT(13)
178#define ETH_MAC2_ED BIT(14)
179
180/* Ethernet IPGT register */
181#define ETH_IPGT 0x0000007f
182
183/* Ethernet IPGR registers */
184#define ETH_IPGR_IPGR2 0x0000007f
185#define ETH_IPGR_IPGR1 0x00007f00
186
187/* Ethernet CLRT registers */
188#define ETH_CLRT_MAX_RET 0x0000000f
189#define ETH_CLRT_COL_WIN 0x00003f00
190
191/* Ethernet MAXF register */
192#define ETH_MAXF 0x0000ffff
193
194/* Ethernet test registers */
195#define ETH_TEST_REG BIT(2)
196#define ETH_MCP_DIV 0x000000ff
197
198/* MII registers */
199#define ETH_MII_CFG_RSVD 0x0000000c
200#define ETH_MII_CMD_RD BIT(0)
201#define ETH_MII_CMD_SCN BIT(1)
202#define ETH_MII_REG_ADDR 0x0000001f
203#define ETH_MII_PHY_ADDR 0x00001f00
204#define ETH_MII_WTD_DATA 0x0000ffff
205#define ETH_MII_RDD_DATA 0x0000ffff
206#define ETH_MII_IND_BSY BIT(0)
207#define ETH_MII_IND_SCN BIT(1)
208#define ETH_MII_IND_NV BIT(2)
209
210/* Values for the DEVCS field of the Ethernet DMA Rx and Tx descriptors. */
211#define ETH_RX_FD BIT(0)
212#define ETH_RX_LD BIT(1)
213#define ETH_RX_ROK BIT(2)
214#define ETH_RX_FM BIT(3)
215#define ETH_RX_MP BIT(4)
216#define ETH_RX_BP BIT(5)
217#define ETH_RX_VLT BIT(6)
218#define ETH_RX_CF BIT(7)
219#define ETH_RX_OVR BIT(8)
220#define ETH_RX_CRC BIT(9)
221#define ETH_RX_CV BIT(10)
222#define ETH_RX_DB BIT(11)
223#define ETH_RX_LE BIT(12)
224#define ETH_RX_LOR BIT(13)
225#define ETH_RX_CES BIT(14)
226#define ETH_RX_LEN_BIT 16
227#define ETH_RX_LEN 0xffff0000
228
229#define ETH_TX_FD BIT(0)
230#define ETH_TX_LD BIT(1)
231#define ETH_TX_OEN BIT(2)
232#define ETH_TX_PEN BIT(3)
233#define ETH_TX_CEN BIT(4)
234#define ETH_TX_HEN BIT(5)
235#define ETH_TX_TOK BIT(6)
236#define ETH_TX_MP BIT(7)
237#define ETH_TX_BP BIT(8)
238#define ETH_TX_UND BIT(9)
239#define ETH_TX_OF BIT(10)
240#define ETH_TX_ED BIT(11)
241#define ETH_TX_EC BIT(12)
242#define ETH_TX_LC BIT(13)
243#define ETH_TX_TD BIT(14)
244#define ETH_TX_CRC BIT(15)
245#define ETH_TX_LE BIT(16)
246#define ETH_TX_CC 0x001E0000
247
248/* DMA descriptor (in physical memory). */
249struct dma_desc {
250 u32 control; /* Control. use DMAD_* */
251 u32 ca; /* Current Address. */
252 u32 devcs; /* Device control and status. */
253 u32 link; /* Next descriptor in chain. */
254};
255
256#define DMA_DESC_COUNT_BIT 0
257#define DMA_DESC_COUNT_MSK 0x0003ffff
258#define DMA_DESC_DS_BIT 20
259#define DMA_DESC_DS_MSK 0x00300000
260
261#define DMA_DESC_DEV_CMD_BIT 22
262#define DMA_DESC_DEV_CMD_MSK 0x01c00000
263
264/* DMA descriptors interrupts */
265#define DMA_DESC_COF BIT(25) /* Chain on finished */
266#define DMA_DESC_COD BIT(26) /* Chain on done */
267#define DMA_DESC_IOF BIT(27) /* Interrupt on finished */
268#define DMA_DESC_IOD BIT(28) /* Interrupt on done */
269#define DMA_DESC_TERM BIT(29) /* Terminated */
270#define DMA_DESC_DONE BIT(30) /* Done */
271#define DMA_DESC_FINI BIT(31) /* Finished */
272
273/* DMA register (within Internal Register Map). */
274struct dma_reg {
275 u32 dmac; /* Control. */
276 u32 dmas; /* Status. */
277 u32 dmasm; /* Mask. */
278 u32 dmadptr; /* Descriptor pointer. */
279 u32 dmandptr; /* Next descriptor pointer. */
280};
281
282/* DMA channels specific registers */
283#define DMA_CHAN_RUN_BIT BIT(0)
284#define DMA_CHAN_DONE_BIT BIT(1)
285#define DMA_CHAN_MODE_BIT BIT(2)
286#define DMA_CHAN_MODE_MSK 0x0000000c
287#define DMA_CHAN_MODE_AUTO 0
288#define DMA_CHAN_MODE_BURST 1
289#define DMA_CHAN_MODE_XFRT 2
290#define DMA_CHAN_MODE_RSVD 3
291#define DMA_CHAN_ACT_BIT BIT(4)
292
293/* DMA status registers */
294#define DMA_STAT_FINI BIT(0)
295#define DMA_STAT_DONE BIT(1)
296#define DMA_STAT_CHAIN BIT(2)
297#define DMA_STAT_ERR BIT(3)
298#define DMA_STAT_HALT BIT(4)
299
300#define STATION_ADDRESS_HIGH(dev) (((dev)->dev_addr[0] << 8) | \
301 ((dev)->dev_addr[1]))
302#define STATION_ADDRESS_LOW(dev) (((dev)->dev_addr[2] << 24) | \
303 ((dev)->dev_addr[3] << 16) | \
304 ((dev)->dev_addr[4] << 8) | \
305 ((dev)->dev_addr[5]))
306
307#define MII_CLOCK 1250000 /* no more than 2.5MHz */
308
309/* the following must be powers of two */
310#define KORINA_NUM_RDS 64 /* number of receive descriptors */
311#define KORINA_NUM_TDS 64 /* number of transmit descriptors */
312
313/* KORINA_RBSIZE is the hardware's default maximum receive
314 * frame size in bytes. Having this hardcoded means that there
315 * is no support for MTU sizes greater than 1500. */
316#define KORINA_RBSIZE 1536 /* size of one resource buffer = Ether MTU */
317#define KORINA_RDS_MASK (KORINA_NUM_RDS - 1)
318#define KORINA_TDS_MASK (KORINA_NUM_TDS - 1)
319#define RD_RING_SIZE (KORINA_NUM_RDS * sizeof(struct dma_desc))
320#define TD_RING_SIZE (KORINA_NUM_TDS * sizeof(struct dma_desc))
321
322#define TX_TIMEOUT (6000 * HZ / 1000)
323
324enum chain_status {
325 desc_filled,
326 desc_is_empty
327};
328
329#define DMA_COUNT(count) ((count) & DMA_DESC_COUNT_MSK)
330#define IS_DMA_FINISHED(X) (((X) & (DMA_DESC_FINI)) != 0)
331#define IS_DMA_DONE(X) (((X) & (DMA_DESC_DONE)) != 0)
332#define RCVPKT_LENGTH(X) (((X) & ETH_RX_LEN) >> ETH_RX_LEN_BIT)
333
334/* Information that need to be kept for each board. */
335struct korina_private {
336 struct eth_regs __iomem *eth_regs;
337 struct dma_reg __iomem *rx_dma_regs;
338 struct dma_reg __iomem *tx_dma_regs;
339 struct dma_desc *td_ring; /* transmit descriptor ring */
340 struct dma_desc *rd_ring; /* receive descriptor ring */
341 dma_addr_t td_dma;
342 dma_addr_t rd_dma;
343
344 struct sk_buff *tx_skb[KORINA_NUM_TDS];
345 struct sk_buff *rx_skb[KORINA_NUM_RDS];
346
347 dma_addr_t rx_skb_dma[KORINA_NUM_RDS];
348 dma_addr_t tx_skb_dma[KORINA_NUM_TDS];
349
350 int rx_next_done;
351 int rx_chain_head;
352 int rx_chain_tail;
353 enum chain_status rx_chain_status;
354
355 int tx_next_done;
356 int tx_chain_head;
357 int tx_chain_tail;
358 enum chain_status tx_chain_status;
359 int tx_count;
360 int tx_full;
361
362 int rx_irq;
363 int tx_irq;
364
365 spinlock_t lock; /* NIC xmit lock */
366
367 int dma_halt_cnt;
368 int dma_run_cnt;
369 struct napi_struct napi;
370 struct timer_list media_check_timer;
371 struct mii_if_info mii_if;
372 struct work_struct restart_task;
373 struct net_device *dev;
374 struct device *dmadev;
375 int mii_clock_freq;
376};
377
378static dma_addr_t korina_tx_dma(struct korina_private *lp, int idx)
379{
380 return lp->td_dma + (idx * sizeof(struct dma_desc));
381}
382
383static dma_addr_t korina_rx_dma(struct korina_private *lp, int idx)
384{
385 return lp->rd_dma + (idx * sizeof(struct dma_desc));
386}
387
388static inline void korina_abort_dma(struct net_device *dev,
389 struct dma_reg *ch)
390{
391 if (readl(&ch->dmac) & DMA_CHAN_RUN_BIT) {
392 writel(0x10, &ch->dmac);
393
394 while (!(readl(&ch->dmas) & DMA_STAT_HALT))
395 netif_trans_update(dev);
396
397 writel(0, &ch->dmas);
398 }
399
400 writel(0, &ch->dmadptr);
401 writel(0, &ch->dmandptr);
402}
403
404static void korina_abort_tx(struct net_device *dev)
405{
406 struct korina_private *lp = netdev_priv(dev);
407
408 korina_abort_dma(dev, lp->tx_dma_regs);
409}
410
411static void korina_abort_rx(struct net_device *dev)
412{
413 struct korina_private *lp = netdev_priv(dev);
414
415 korina_abort_dma(dev, lp->rx_dma_regs);
416}
417
418/* transmit packet */
419static netdev_tx_t korina_send_packet(struct sk_buff *skb,
420 struct net_device *dev)
421{
422 struct korina_private *lp = netdev_priv(dev);
423 u32 chain_prev, chain_next;
424 unsigned long flags;
425 struct dma_desc *td;
426 dma_addr_t ca;
427 u32 length;
428 int idx;
429
430 spin_lock_irqsave(&lp->lock, flags);
431
432 idx = lp->tx_chain_tail;
433 td = &lp->td_ring[idx];
434
435 /* stop queue when full, drop pkts if queue already full */
436 if (lp->tx_count >= (KORINA_NUM_TDS - 2)) {
437 lp->tx_full = 1;
438
439 if (lp->tx_count == (KORINA_NUM_TDS - 2))
440 netif_stop_queue(dev);
441 else
442 goto drop_packet;
443 }
444
445 lp->tx_count++;
446
447 lp->tx_skb[idx] = skb;
448
449 length = skb->len;
450
451 /* Setup the transmit descriptor. */
452 ca = dma_map_single(lp->dmadev, skb->data, length, DMA_TO_DEVICE);
453 if (dma_mapping_error(lp->dmadev, ca))
454 goto drop_packet;
455
456 lp->tx_skb_dma[idx] = ca;
457 td->ca = ca;
458
459 chain_prev = (idx - 1) & KORINA_TDS_MASK;
460 chain_next = (idx + 1) & KORINA_TDS_MASK;
461
462 if (readl(&(lp->tx_dma_regs->dmandptr)) == 0) {
463 if (lp->tx_chain_status == desc_is_empty) {
464 /* Update tail */
465 td->control = DMA_COUNT(length) |
466 DMA_DESC_COF | DMA_DESC_IOF;
467 /* Move tail */
468 lp->tx_chain_tail = chain_next;
469 /* Write to NDPTR */
470 writel(korina_tx_dma(lp, lp->tx_chain_head),
471 &lp->tx_dma_regs->dmandptr);
472 /* Move head to tail */
473 lp->tx_chain_head = lp->tx_chain_tail;
474 } else {
475 /* Update tail */
476 td->control = DMA_COUNT(length) |
477 DMA_DESC_COF | DMA_DESC_IOF;
478 /* Link to prev */
479 lp->td_ring[chain_prev].control &=
480 ~DMA_DESC_COF;
481 /* Link to prev */
482 lp->td_ring[chain_prev].link = korina_tx_dma(lp, idx);
483 /* Move tail */
484 lp->tx_chain_tail = chain_next;
485 /* Write to NDPTR */
486 writel(korina_tx_dma(lp, lp->tx_chain_head),
487 &lp->tx_dma_regs->dmandptr);
488 /* Move head to tail */
489 lp->tx_chain_head = lp->tx_chain_tail;
490 lp->tx_chain_status = desc_is_empty;
491 }
492 } else {
493 if (lp->tx_chain_status == desc_is_empty) {
494 /* Update tail */
495 td->control = DMA_COUNT(length) |
496 DMA_DESC_COF | DMA_DESC_IOF;
497 /* Move tail */
498 lp->tx_chain_tail = chain_next;
499 lp->tx_chain_status = desc_filled;
500 } else {
501 /* Update tail */
502 td->control = DMA_COUNT(length) |
503 DMA_DESC_COF | DMA_DESC_IOF;
504 lp->td_ring[chain_prev].control &=
505 ~DMA_DESC_COF;
506 lp->td_ring[chain_prev].link = korina_tx_dma(lp, idx);
507 lp->tx_chain_tail = chain_next;
508 }
509 }
510
511 netif_trans_update(dev);
512 spin_unlock_irqrestore(&lp->lock, flags);
513
514 return NETDEV_TX_OK;
515
516drop_packet:
517 dev->stats.tx_dropped++;
518 dev_kfree_skb_any(skb);
519 spin_unlock_irqrestore(&lp->lock, flags);
520
521 return NETDEV_TX_OK;
522}
523
524static int korina_mdio_wait(struct korina_private *lp)
525{
526 u32 value;
527
528 return readl_poll_timeout_atomic(&lp->eth_regs->miimind,
529 value, value & ETH_MII_IND_BSY,
530 1, 1000);
531}
532
533static int korina_mdio_read(struct net_device *dev, int phy, int reg)
534{
535 struct korina_private *lp = netdev_priv(dev);
536 int ret;
537
538 ret = korina_mdio_wait(lp);
539 if (ret < 0)
540 return ret;
541
542 writel(phy << 8 | reg, &lp->eth_regs->miimaddr);
543 writel(1, &lp->eth_regs->miimcmd);
544
545 ret = korina_mdio_wait(lp);
546 if (ret < 0)
547 return ret;
548
549 if (readl(&lp->eth_regs->miimind) & ETH_MII_IND_NV)
550 return -EINVAL;
551
552 ret = readl(&lp->eth_regs->miimrdd);
553 writel(0, &lp->eth_regs->miimcmd);
554 return ret;
555}
556
557static void korina_mdio_write(struct net_device *dev, int phy, int reg, int val)
558{
559 struct korina_private *lp = netdev_priv(dev);
560
561 if (korina_mdio_wait(lp))
562 return;
563
564 writel(0, &lp->eth_regs->miimcmd);
565 writel(phy << 8 | reg, &lp->eth_regs->miimaddr);
566 writel(val, &lp->eth_regs->miimwtd);
567}
568
569/* Ethernet Rx DMA interrupt */
570static irqreturn_t korina_rx_dma_interrupt(int irq, void *dev_id)
571{
572 struct net_device *dev = dev_id;
573 struct korina_private *lp = netdev_priv(dev);
574 u32 dmas, dmasm;
575 irqreturn_t retval;
576
577 dmas = readl(&lp->rx_dma_regs->dmas);
578 if (dmas & (DMA_STAT_DONE | DMA_STAT_HALT | DMA_STAT_ERR)) {
579 dmasm = readl(&lp->rx_dma_regs->dmasm);
580 writel(dmasm | (DMA_STAT_DONE |
581 DMA_STAT_HALT | DMA_STAT_ERR),
582 &lp->rx_dma_regs->dmasm);
583
584 napi_schedule(&lp->napi);
585
586 if (dmas & DMA_STAT_ERR)
587 printk(KERN_ERR "%s: DMA error\n", dev->name);
588
589 retval = IRQ_HANDLED;
590 } else
591 retval = IRQ_NONE;
592
593 return retval;
594}
595
596static int korina_rx(struct net_device *dev, int limit)
597{
598 struct korina_private *lp = netdev_priv(dev);
599 struct dma_desc *rd = &lp->rd_ring[lp->rx_next_done];
600 struct sk_buff *skb, *skb_new;
601 u32 devcs, pkt_len, dmas;
602 dma_addr_t ca;
603 int count;
604
605 for (count = 0; count < limit; count++) {
606 skb = lp->rx_skb[lp->rx_next_done];
607 skb_new = NULL;
608
609 devcs = rd->devcs;
610
611 if ((KORINA_RBSIZE - (u32)DMA_COUNT(rd->control)) == 0)
612 break;
613
614 /* check that this is a whole packet
615 * WARNING: DMA_FD bit incorrectly set
616 * in Rc32434 (errata ref #077) */
617 if (!(devcs & ETH_RX_LD))
618 goto next;
619
620 if (!(devcs & ETH_RX_ROK)) {
621 /* Update statistics counters */
622 dev->stats.rx_errors++;
623 dev->stats.rx_dropped++;
624 if (devcs & ETH_RX_CRC)
625 dev->stats.rx_crc_errors++;
626 if (devcs & ETH_RX_LE)
627 dev->stats.rx_length_errors++;
628 if (devcs & ETH_RX_OVR)
629 dev->stats.rx_fifo_errors++;
630 if (devcs & ETH_RX_CV)
631 dev->stats.rx_frame_errors++;
632 if (devcs & ETH_RX_CES)
633 dev->stats.rx_frame_errors++;
634
635 goto next;
636 }
637
638 /* Malloc up new buffer. */
639 skb_new = netdev_alloc_skb_ip_align(dev, KORINA_RBSIZE);
640 if (!skb_new)
641 break;
642
643 ca = dma_map_single(lp->dmadev, skb_new->data, KORINA_RBSIZE,
644 DMA_FROM_DEVICE);
645 if (dma_mapping_error(lp->dmadev, ca)) {
646 dev_kfree_skb_any(skb_new);
647 break;
648 }
649
650 pkt_len = RCVPKT_LENGTH(devcs);
651 dma_unmap_single(lp->dmadev, lp->rx_skb_dma[lp->rx_next_done],
652 pkt_len, DMA_FROM_DEVICE);
653
654 /* Do not count the CRC */
655 skb_put(skb, pkt_len - 4);
656 skb->protocol = eth_type_trans(skb, dev);
657
658 /* Pass the packet to upper layers */
659 napi_gro_receive(&lp->napi, skb);
660 dev->stats.rx_packets++;
661 dev->stats.rx_bytes += pkt_len;
662
663 /* Update the mcast stats */
664 if (devcs & ETH_RX_MP)
665 dev->stats.multicast++;
666
667 lp->rx_skb[lp->rx_next_done] = skb_new;
668 lp->rx_skb_dma[lp->rx_next_done] = ca;
669
670next:
671 rd->devcs = 0;
672
673 /* Restore descriptor's curr_addr */
674 rd->ca = lp->rx_skb_dma[lp->rx_next_done];
675
676 rd->control = DMA_COUNT(KORINA_RBSIZE) |
677 DMA_DESC_COD | DMA_DESC_IOD;
678 lp->rd_ring[(lp->rx_next_done - 1) &
679 KORINA_RDS_MASK].control &=
680 ~DMA_DESC_COD;
681
682 lp->rx_next_done = (lp->rx_next_done + 1) & KORINA_RDS_MASK;
683 rd = &lp->rd_ring[lp->rx_next_done];
684 writel((u32)~DMA_STAT_DONE, &lp->rx_dma_regs->dmas);
685 }
686
687 dmas = readl(&lp->rx_dma_regs->dmas);
688
689 if (dmas & DMA_STAT_HALT) {
690 writel((u32)~(DMA_STAT_HALT | DMA_STAT_ERR),
691 &lp->rx_dma_regs->dmas);
692
693 lp->dma_halt_cnt++;
694 rd->devcs = 0;
695 rd->ca = lp->rx_skb_dma[lp->rx_next_done];
696 writel(korina_rx_dma(lp, rd - lp->rd_ring),
697 &lp->rx_dma_regs->dmandptr);
698 }
699
700 return count;
701}
702
703static int korina_poll(struct napi_struct *napi, int budget)
704{
705 struct korina_private *lp =
706 container_of(napi, struct korina_private, napi);
707 struct net_device *dev = lp->dev;
708 int work_done;
709
710 work_done = korina_rx(dev, budget);
711 if (work_done < budget) {
712 napi_complete_done(napi, work_done);
713
714 writel(readl(&lp->rx_dma_regs->dmasm) &
715 ~(DMA_STAT_DONE | DMA_STAT_HALT | DMA_STAT_ERR),
716 &lp->rx_dma_regs->dmasm);
717 }
718 return work_done;
719}
720
721/*
722 * Set or clear the multicast filter for this adaptor.
723 */
724static void korina_multicast_list(struct net_device *dev)
725{
726 struct korina_private *lp = netdev_priv(dev);
727 unsigned long flags;
728 struct netdev_hw_addr *ha;
729 u32 recognise = ETH_ARC_AB; /* always accept broadcasts */
730
731 /* Set promiscuous mode */
732 if (dev->flags & IFF_PROMISC)
733 recognise |= ETH_ARC_PRO;
734
735 else if ((dev->flags & IFF_ALLMULTI) || (netdev_mc_count(dev) > 4))
736 /* All multicast and broadcast */
737 recognise |= ETH_ARC_AM;
738
739 /* Build the hash table */
740 if (netdev_mc_count(dev) > 4) {
741 u16 hash_table[4] = { 0 };
742 u32 crc;
743
744 netdev_for_each_mc_addr(ha, dev) {
745 crc = ether_crc_le(6, ha->addr);
746 crc >>= 26;
747 hash_table[crc >> 4] |= 1 << (15 - (crc & 0xf));
748 }
749 /* Accept filtered multicast */
750 recognise |= ETH_ARC_AFM;
751
752 /* Fill the MAC hash tables with their values */
753 writel((u32)(hash_table[1] << 16 | hash_table[0]),
754 &lp->eth_regs->ethhash0);
755 writel((u32)(hash_table[3] << 16 | hash_table[2]),
756 &lp->eth_regs->ethhash1);
757 }
758
759 spin_lock_irqsave(&lp->lock, flags);
760 writel(recognise, &lp->eth_regs->etharc);
761 spin_unlock_irqrestore(&lp->lock, flags);
762}
763
764static void korina_tx(struct net_device *dev)
765{
766 struct korina_private *lp = netdev_priv(dev);
767 struct dma_desc *td = &lp->td_ring[lp->tx_next_done];
768 u32 devcs;
769 u32 dmas;
770
771 spin_lock(&lp->lock);
772
773 /* Process all desc that are done */
774 while (IS_DMA_FINISHED(td->control)) {
775 if (lp->tx_full == 1) {
776 netif_wake_queue(dev);
777 lp->tx_full = 0;
778 }
779
780 devcs = lp->td_ring[lp->tx_next_done].devcs;
781 if ((devcs & (ETH_TX_FD | ETH_TX_LD)) !=
782 (ETH_TX_FD | ETH_TX_LD)) {
783 dev->stats.tx_errors++;
784 dev->stats.tx_dropped++;
785
786 /* Should never happen */
787 printk(KERN_ERR "%s: split tx ignored\n",
788 dev->name);
789 } else if (devcs & ETH_TX_TOK) {
790 dev->stats.tx_packets++;
791 dev->stats.tx_bytes +=
792 lp->tx_skb[lp->tx_next_done]->len;
793 } else {
794 dev->stats.tx_errors++;
795 dev->stats.tx_dropped++;
796
797 /* Underflow */
798 if (devcs & ETH_TX_UND)
799 dev->stats.tx_fifo_errors++;
800
801 /* Oversized frame */
802 if (devcs & ETH_TX_OF)
803 dev->stats.tx_aborted_errors++;
804
805 /* Excessive deferrals */
806 if (devcs & ETH_TX_ED)
807 dev->stats.tx_carrier_errors++;
808
809 /* Collisions: medium busy */
810 if (devcs & ETH_TX_EC)
811 dev->stats.collisions++;
812
813 /* Late collision */
814 if (devcs & ETH_TX_LC)
815 dev->stats.tx_window_errors++;
816 }
817
818 /* We must always free the original skb */
819 if (lp->tx_skb[lp->tx_next_done]) {
820 dma_unmap_single(lp->dmadev,
821 lp->tx_skb_dma[lp->tx_next_done],
822 lp->tx_skb[lp->tx_next_done]->len,
823 DMA_TO_DEVICE);
824 dev_kfree_skb_any(lp->tx_skb[lp->tx_next_done]);
825 lp->tx_skb[lp->tx_next_done] = NULL;
826 }
827
828 lp->td_ring[lp->tx_next_done].control = DMA_DESC_IOF;
829 lp->td_ring[lp->tx_next_done].devcs = ETH_TX_FD | ETH_TX_LD;
830 lp->td_ring[lp->tx_next_done].link = 0;
831 lp->td_ring[lp->tx_next_done].ca = 0;
832 lp->tx_count--;
833
834 /* Go on to next transmission */
835 lp->tx_next_done = (lp->tx_next_done + 1) & KORINA_TDS_MASK;
836 td = &lp->td_ring[lp->tx_next_done];
837
838 }
839
840 /* Clear the DMA status register */
841 dmas = readl(&lp->tx_dma_regs->dmas);
842 writel(~dmas, &lp->tx_dma_regs->dmas);
843
844 writel(readl(&lp->tx_dma_regs->dmasm) &
845 ~(DMA_STAT_FINI | DMA_STAT_ERR),
846 &lp->tx_dma_regs->dmasm);
847
848 spin_unlock(&lp->lock);
849}
850
851static irqreturn_t
852korina_tx_dma_interrupt(int irq, void *dev_id)
853{
854 struct net_device *dev = dev_id;
855 struct korina_private *lp = netdev_priv(dev);
856 u32 dmas, dmasm;
857 irqreturn_t retval;
858
859 dmas = readl(&lp->tx_dma_regs->dmas);
860
861 if (dmas & (DMA_STAT_FINI | DMA_STAT_ERR)) {
862 dmasm = readl(&lp->tx_dma_regs->dmasm);
863 writel(dmasm | (DMA_STAT_FINI | DMA_STAT_ERR),
864 &lp->tx_dma_regs->dmasm);
865
866 korina_tx(dev);
867
868 if (lp->tx_chain_status == desc_filled &&
869 (readl(&(lp->tx_dma_regs->dmandptr)) == 0)) {
870 writel(korina_tx_dma(lp, lp->tx_chain_head),
871 &lp->tx_dma_regs->dmandptr);
872 lp->tx_chain_status = desc_is_empty;
873 lp->tx_chain_head = lp->tx_chain_tail;
874 netif_trans_update(dev);
875 }
876 if (dmas & DMA_STAT_ERR)
877 printk(KERN_ERR "%s: DMA error\n", dev->name);
878
879 retval = IRQ_HANDLED;
880 } else
881 retval = IRQ_NONE;
882
883 return retval;
884}
885
886
887static void korina_check_media(struct net_device *dev, unsigned int init_media)
888{
889 struct korina_private *lp = netdev_priv(dev);
890
891 mii_check_media(&lp->mii_if, 1, init_media);
892
893 if (lp->mii_if.full_duplex)
894 writel(readl(&lp->eth_regs->ethmac2) | ETH_MAC2_FD,
895 &lp->eth_regs->ethmac2);
896 else
897 writel(readl(&lp->eth_regs->ethmac2) & ~ETH_MAC2_FD,
898 &lp->eth_regs->ethmac2);
899}
900
901static void korina_poll_media(struct timer_list *t)
902{
903 struct korina_private *lp = from_timer(lp, t, media_check_timer);
904 struct net_device *dev = lp->dev;
905
906 korina_check_media(dev, 0);
907 mod_timer(&lp->media_check_timer, jiffies + HZ);
908}
909
910static void korina_set_carrier(struct mii_if_info *mii)
911{
912 if (mii->force_media) {
913 /* autoneg is off: Link is always assumed to be up */
914 if (!netif_carrier_ok(mii->dev))
915 netif_carrier_on(mii->dev);
916 } else /* Let MMI library update carrier status */
917 korina_check_media(mii->dev, 0);
918}
919
920static int korina_ioctl(struct net_device *dev, struct ifreq *rq, int cmd)
921{
922 struct korina_private *lp = netdev_priv(dev);
923 struct mii_ioctl_data *data = if_mii(rq);
924 int rc;
925
926 if (!netif_running(dev))
927 return -EINVAL;
928 spin_lock_irq(&lp->lock);
929 rc = generic_mii_ioctl(&lp->mii_if, data, cmd, NULL);
930 spin_unlock_irq(&lp->lock);
931 korina_set_carrier(&lp->mii_if);
932
933 return rc;
934}
935
936/* ethtool helpers */
937static void netdev_get_drvinfo(struct net_device *dev,
938 struct ethtool_drvinfo *info)
939{
940 struct korina_private *lp = netdev_priv(dev);
941
942 strscpy(info->driver, DRV_NAME, sizeof(info->driver));
943 strscpy(info->version, DRV_VERSION, sizeof(info->version));
944 strscpy(info->bus_info, lp->dev->name, sizeof(info->bus_info));
945}
946
947static int netdev_get_link_ksettings(struct net_device *dev,
948 struct ethtool_link_ksettings *cmd)
949{
950 struct korina_private *lp = netdev_priv(dev);
951
952 spin_lock_irq(&lp->lock);
953 mii_ethtool_get_link_ksettings(&lp->mii_if, cmd);
954 spin_unlock_irq(&lp->lock);
955
956 return 0;
957}
958
959static int netdev_set_link_ksettings(struct net_device *dev,
960 const struct ethtool_link_ksettings *cmd)
961{
962 struct korina_private *lp = netdev_priv(dev);
963 int rc;
964
965 spin_lock_irq(&lp->lock);
966 rc = mii_ethtool_set_link_ksettings(&lp->mii_if, cmd);
967 spin_unlock_irq(&lp->lock);
968 korina_set_carrier(&lp->mii_if);
969
970 return rc;
971}
972
973static u32 netdev_get_link(struct net_device *dev)
974{
975 struct korina_private *lp = netdev_priv(dev);
976
977 return mii_link_ok(&lp->mii_if);
978}
979
980static const struct ethtool_ops netdev_ethtool_ops = {
981 .get_drvinfo = netdev_get_drvinfo,
982 .get_link = netdev_get_link,
983 .get_link_ksettings = netdev_get_link_ksettings,
984 .set_link_ksettings = netdev_set_link_ksettings,
985};
986
987static int korina_alloc_ring(struct net_device *dev)
988{
989 struct korina_private *lp = netdev_priv(dev);
990 struct sk_buff *skb;
991 dma_addr_t ca;
992 int i;
993
994 /* Initialize the transmit descriptors */
995 for (i = 0; i < KORINA_NUM_TDS; i++) {
996 lp->td_ring[i].control = DMA_DESC_IOF;
997 lp->td_ring[i].devcs = ETH_TX_FD | ETH_TX_LD;
998 lp->td_ring[i].ca = 0;
999 lp->td_ring[i].link = 0;
1000 }
1001 lp->tx_next_done = lp->tx_chain_head = lp->tx_chain_tail =
1002 lp->tx_full = lp->tx_count = 0;
1003 lp->tx_chain_status = desc_is_empty;
1004
1005 /* Initialize the receive descriptors */
1006 for (i = 0; i < KORINA_NUM_RDS; i++) {
1007 skb = netdev_alloc_skb_ip_align(dev, KORINA_RBSIZE);
1008 if (!skb)
1009 return -ENOMEM;
1010 lp->rx_skb[i] = skb;
1011 lp->rd_ring[i].control = DMA_DESC_IOD |
1012 DMA_COUNT(KORINA_RBSIZE);
1013 lp->rd_ring[i].devcs = 0;
1014 ca = dma_map_single(lp->dmadev, skb->data, KORINA_RBSIZE,
1015 DMA_FROM_DEVICE);
1016 if (dma_mapping_error(lp->dmadev, ca))
1017 return -ENOMEM;
1018 lp->rd_ring[i].ca = ca;
1019 lp->rx_skb_dma[i] = ca;
1020 lp->rd_ring[i].link = korina_rx_dma(lp, i + 1);
1021 }
1022
1023 /* loop back receive descriptors, so the last
1024 * descriptor points to the first one */
1025 lp->rd_ring[i - 1].link = lp->rd_dma;
1026 lp->rd_ring[i - 1].control |= DMA_DESC_COD;
1027
1028 lp->rx_next_done = 0;
1029 lp->rx_chain_head = 0;
1030 lp->rx_chain_tail = 0;
1031 lp->rx_chain_status = desc_is_empty;
1032
1033 return 0;
1034}
1035
1036static void korina_free_ring(struct net_device *dev)
1037{
1038 struct korina_private *lp = netdev_priv(dev);
1039 int i;
1040
1041 for (i = 0; i < KORINA_NUM_RDS; i++) {
1042 lp->rd_ring[i].control = 0;
1043 if (lp->rx_skb[i]) {
1044 dma_unmap_single(lp->dmadev, lp->rx_skb_dma[i],
1045 KORINA_RBSIZE, DMA_FROM_DEVICE);
1046 dev_kfree_skb_any(lp->rx_skb[i]);
1047 lp->rx_skb[i] = NULL;
1048 }
1049 }
1050
1051 for (i = 0; i < KORINA_NUM_TDS; i++) {
1052 lp->td_ring[i].control = 0;
1053 if (lp->tx_skb[i]) {
1054 dma_unmap_single(lp->dmadev, lp->tx_skb_dma[i],
1055 lp->tx_skb[i]->len, DMA_TO_DEVICE);
1056 dev_kfree_skb_any(lp->tx_skb[i]);
1057 lp->tx_skb[i] = NULL;
1058 }
1059 }
1060}
1061
1062/*
1063 * Initialize the RC32434 ethernet controller.
1064 */
1065static int korina_init(struct net_device *dev)
1066{
1067 struct korina_private *lp = netdev_priv(dev);
1068
1069 /* Disable DMA */
1070 korina_abort_tx(dev);
1071 korina_abort_rx(dev);
1072
1073 /* reset ethernet logic */
1074 writel(0, &lp->eth_regs->ethintfc);
1075 while ((readl(&lp->eth_regs->ethintfc) & ETH_INT_FC_RIP))
1076 netif_trans_update(dev);
1077
1078 /* Enable Ethernet Interface */
1079 writel(ETH_INT_FC_EN, &lp->eth_regs->ethintfc);
1080
1081 /* Allocate rings */
1082 if (korina_alloc_ring(dev)) {
1083 printk(KERN_ERR "%s: descriptor allocation failed\n", dev->name);
1084 korina_free_ring(dev);
1085 return -ENOMEM;
1086 }
1087
1088 writel(0, &lp->rx_dma_regs->dmas);
1089 /* Start Rx DMA */
1090 writel(0, &lp->rx_dma_regs->dmandptr);
1091 writel(korina_rx_dma(lp, 0), &lp->rx_dma_regs->dmadptr);
1092
1093 writel(readl(&lp->tx_dma_regs->dmasm) &
1094 ~(DMA_STAT_FINI | DMA_STAT_ERR),
1095 &lp->tx_dma_regs->dmasm);
1096 writel(readl(&lp->rx_dma_regs->dmasm) &
1097 ~(DMA_STAT_DONE | DMA_STAT_HALT | DMA_STAT_ERR),
1098 &lp->rx_dma_regs->dmasm);
1099
1100 /* Accept only packets destined for this Ethernet device address */
1101 writel(ETH_ARC_AB, &lp->eth_regs->etharc);
1102
1103 /* Set all Ether station address registers to their initial values */
1104 writel(STATION_ADDRESS_LOW(dev), &lp->eth_regs->ethsal0);
1105 writel(STATION_ADDRESS_HIGH(dev), &lp->eth_regs->ethsah0);
1106
1107 writel(STATION_ADDRESS_LOW(dev), &lp->eth_regs->ethsal1);
1108 writel(STATION_ADDRESS_HIGH(dev), &lp->eth_regs->ethsah1);
1109
1110 writel(STATION_ADDRESS_LOW(dev), &lp->eth_regs->ethsal2);
1111 writel(STATION_ADDRESS_HIGH(dev), &lp->eth_regs->ethsah2);
1112
1113 writel(STATION_ADDRESS_LOW(dev), &lp->eth_regs->ethsal3);
1114 writel(STATION_ADDRESS_HIGH(dev), &lp->eth_regs->ethsah3);
1115
1116
1117 /* Frame Length Checking, Pad Enable, CRC Enable, Full Duplex set */
1118 writel(ETH_MAC2_PE | ETH_MAC2_CEN | ETH_MAC2_FD,
1119 &lp->eth_regs->ethmac2);
1120
1121 /* Back to back inter-packet-gap */
1122 writel(0x15, &lp->eth_regs->ethipgt);
1123 /* Non - Back to back inter-packet-gap */
1124 writel(0x12, &lp->eth_regs->ethipgr);
1125
1126 /* Management Clock Prescaler Divisor
1127 * Clock independent setting */
1128 writel(((lp->mii_clock_freq) / MII_CLOCK + 1) & ~1,
1129 &lp->eth_regs->ethmcp);
1130 writel(0, &lp->eth_regs->miimcfg);
1131
1132 /* don't transmit until fifo contains 48b */
1133 writel(48, &lp->eth_regs->ethfifott);
1134
1135 writel(ETH_MAC1_RE, &lp->eth_regs->ethmac1);
1136
1137 korina_check_media(dev, 1);
1138
1139 napi_enable(&lp->napi);
1140 netif_start_queue(dev);
1141
1142 return 0;
1143}
1144
1145/*
1146 * Restart the RC32434 ethernet controller.
1147 */
1148static void korina_restart_task(struct work_struct *work)
1149{
1150 struct korina_private *lp = container_of(work,
1151 struct korina_private, restart_task);
1152 struct net_device *dev = lp->dev;
1153
1154 /*
1155 * Disable interrupts
1156 */
1157 disable_irq(lp->rx_irq);
1158 disable_irq(lp->tx_irq);
1159
1160 writel(readl(&lp->tx_dma_regs->dmasm) |
1161 DMA_STAT_FINI | DMA_STAT_ERR,
1162 &lp->tx_dma_regs->dmasm);
1163 writel(readl(&lp->rx_dma_regs->dmasm) |
1164 DMA_STAT_DONE | DMA_STAT_HALT | DMA_STAT_ERR,
1165 &lp->rx_dma_regs->dmasm);
1166
1167 napi_disable(&lp->napi);
1168
1169 korina_free_ring(dev);
1170
1171 if (korina_init(dev) < 0) {
1172 printk(KERN_ERR "%s: cannot restart device\n", dev->name);
1173 return;
1174 }
1175 korina_multicast_list(dev);
1176
1177 enable_irq(lp->tx_irq);
1178 enable_irq(lp->rx_irq);
1179}
1180
1181static void korina_tx_timeout(struct net_device *dev, unsigned int txqueue)
1182{
1183 struct korina_private *lp = netdev_priv(dev);
1184
1185 schedule_work(&lp->restart_task);
1186}
1187
1188#ifdef CONFIG_NET_POLL_CONTROLLER
1189static void korina_poll_controller(struct net_device *dev)
1190{
1191 disable_irq(dev->irq);
1192 korina_tx_dma_interrupt(dev->irq, dev);
1193 enable_irq(dev->irq);
1194}
1195#endif
1196
1197static int korina_open(struct net_device *dev)
1198{
1199 struct korina_private *lp = netdev_priv(dev);
1200 int ret;
1201
1202 /* Initialize */
1203 ret = korina_init(dev);
1204 if (ret < 0) {
1205 printk(KERN_ERR "%s: cannot open device\n", dev->name);
1206 goto out;
1207 }
1208
1209 /* Install the interrupt handler
1210 * that handles the Done Finished */
1211 ret = request_irq(lp->rx_irq, korina_rx_dma_interrupt,
1212 0, "Korina ethernet Rx", dev);
1213 if (ret < 0) {
1214 printk(KERN_ERR "%s: unable to get Rx DMA IRQ %d\n",
1215 dev->name, lp->rx_irq);
1216 goto err_release;
1217 }
1218 ret = request_irq(lp->tx_irq, korina_tx_dma_interrupt,
1219 0, "Korina ethernet Tx", dev);
1220 if (ret < 0) {
1221 printk(KERN_ERR "%s: unable to get Tx DMA IRQ %d\n",
1222 dev->name, lp->tx_irq);
1223 goto err_free_rx_irq;
1224 }
1225
1226 mod_timer(&lp->media_check_timer, jiffies + 1);
1227out:
1228 return ret;
1229
1230err_free_rx_irq:
1231 free_irq(lp->rx_irq, dev);
1232err_release:
1233 korina_free_ring(dev);
1234 goto out;
1235}
1236
1237static int korina_close(struct net_device *dev)
1238{
1239 struct korina_private *lp = netdev_priv(dev);
1240 u32 tmp;
1241
1242 del_timer(&lp->media_check_timer);
1243
1244 /* Disable interrupts */
1245 disable_irq(lp->rx_irq);
1246 disable_irq(lp->tx_irq);
1247
1248 korina_abort_tx(dev);
1249 tmp = readl(&lp->tx_dma_regs->dmasm);
1250 tmp = tmp | DMA_STAT_FINI | DMA_STAT_ERR;
1251 writel(tmp, &lp->tx_dma_regs->dmasm);
1252
1253 korina_abort_rx(dev);
1254 tmp = readl(&lp->rx_dma_regs->dmasm);
1255 tmp = tmp | DMA_STAT_DONE | DMA_STAT_HALT | DMA_STAT_ERR;
1256 writel(tmp, &lp->rx_dma_regs->dmasm);
1257
1258 napi_disable(&lp->napi);
1259
1260 cancel_work_sync(&lp->restart_task);
1261
1262 korina_free_ring(dev);
1263
1264 free_irq(lp->rx_irq, dev);
1265 free_irq(lp->tx_irq, dev);
1266
1267 return 0;
1268}
1269
1270static const struct net_device_ops korina_netdev_ops = {
1271 .ndo_open = korina_open,
1272 .ndo_stop = korina_close,
1273 .ndo_start_xmit = korina_send_packet,
1274 .ndo_set_rx_mode = korina_multicast_list,
1275 .ndo_tx_timeout = korina_tx_timeout,
1276 .ndo_eth_ioctl = korina_ioctl,
1277 .ndo_validate_addr = eth_validate_addr,
1278 .ndo_set_mac_address = eth_mac_addr,
1279#ifdef CONFIG_NET_POLL_CONTROLLER
1280 .ndo_poll_controller = korina_poll_controller,
1281#endif
1282};
1283
1284static int korina_probe(struct platform_device *pdev)
1285{
1286 u8 *mac_addr = dev_get_platdata(&pdev->dev);
1287 struct korina_private *lp;
1288 struct net_device *dev;
1289 struct clk *clk;
1290 void __iomem *p;
1291 int rc;
1292
1293 dev = devm_alloc_etherdev(&pdev->dev, sizeof(struct korina_private));
1294 if (!dev)
1295 return -ENOMEM;
1296
1297 SET_NETDEV_DEV(dev, &pdev->dev);
1298 lp = netdev_priv(dev);
1299
1300 if (mac_addr)
1301 eth_hw_addr_set(dev, mac_addr);
1302 else if (of_get_ethdev_address(pdev->dev.of_node, dev) < 0)
1303 eth_hw_addr_random(dev);
1304
1305 clk = devm_clk_get_optional_enabled(&pdev->dev, "mdioclk");
1306 if (IS_ERR(clk))
1307 return PTR_ERR(clk);
1308 if (clk) {
1309 lp->mii_clock_freq = clk_get_rate(clk);
1310 } else {
1311 lp->mii_clock_freq = 200000000; /* max possible input clk */
1312 }
1313
1314 lp->rx_irq = platform_get_irq_byname(pdev, "rx");
1315 lp->tx_irq = platform_get_irq_byname(pdev, "tx");
1316
1317 p = devm_platform_ioremap_resource_byname(pdev, "emac");
1318 if (IS_ERR(p)) {
1319 printk(KERN_ERR DRV_NAME ": cannot remap registers\n");
1320 return PTR_ERR(p);
1321 }
1322 lp->eth_regs = p;
1323
1324 p = devm_platform_ioremap_resource_byname(pdev, "dma_rx");
1325 if (IS_ERR(p)) {
1326 printk(KERN_ERR DRV_NAME ": cannot remap Rx DMA registers\n");
1327 return PTR_ERR(p);
1328 }
1329 lp->rx_dma_regs = p;
1330
1331 p = devm_platform_ioremap_resource_byname(pdev, "dma_tx");
1332 if (IS_ERR(p)) {
1333 printk(KERN_ERR DRV_NAME ": cannot remap Tx DMA registers\n");
1334 return PTR_ERR(p);
1335 }
1336 lp->tx_dma_regs = p;
1337
1338 lp->td_ring = dmam_alloc_coherent(&pdev->dev, TD_RING_SIZE,
1339 &lp->td_dma, GFP_KERNEL);
1340 if (!lp->td_ring)
1341 return -ENOMEM;
1342
1343 lp->rd_ring = dmam_alloc_coherent(&pdev->dev, RD_RING_SIZE,
1344 &lp->rd_dma, GFP_KERNEL);
1345 if (!lp->rd_ring)
1346 return -ENOMEM;
1347
1348 spin_lock_init(&lp->lock);
1349 /* just use the rx dma irq */
1350 dev->irq = lp->rx_irq;
1351 lp->dev = dev;
1352 lp->dmadev = &pdev->dev;
1353
1354 dev->netdev_ops = &korina_netdev_ops;
1355 dev->ethtool_ops = &netdev_ethtool_ops;
1356 dev->watchdog_timeo = TX_TIMEOUT;
1357 netif_napi_add(dev, &lp->napi, korina_poll);
1358
1359 lp->mii_if.dev = dev;
1360 lp->mii_if.mdio_read = korina_mdio_read;
1361 lp->mii_if.mdio_write = korina_mdio_write;
1362 lp->mii_if.phy_id = 1;
1363 lp->mii_if.phy_id_mask = 0x1f;
1364 lp->mii_if.reg_num_mask = 0x1f;
1365
1366 platform_set_drvdata(pdev, dev);
1367
1368 rc = register_netdev(dev);
1369 if (rc < 0) {
1370 printk(KERN_ERR DRV_NAME
1371 ": cannot register net device: %d\n", rc);
1372 return rc;
1373 }
1374 timer_setup(&lp->media_check_timer, korina_poll_media, 0);
1375
1376 INIT_WORK(&lp->restart_task, korina_restart_task);
1377
1378 printk(KERN_INFO "%s: " DRV_NAME "-" DRV_VERSION " " DRV_RELDATE "\n",
1379 dev->name);
1380 return rc;
1381}
1382
1383static void korina_remove(struct platform_device *pdev)
1384{
1385 struct net_device *dev = platform_get_drvdata(pdev);
1386
1387 unregister_netdev(dev);
1388}
1389
1390#ifdef CONFIG_OF
1391static const struct of_device_id korina_match[] = {
1392 {
1393 .compatible = "idt,3243x-emac",
1394 },
1395 { }
1396};
1397MODULE_DEVICE_TABLE(of, korina_match);
1398#endif
1399
1400static struct platform_driver korina_driver = {
1401 .driver = {
1402 .name = "korina",
1403 .of_match_table = of_match_ptr(korina_match),
1404 },
1405 .probe = korina_probe,
1406 .remove_new = korina_remove,
1407};
1408
1409module_platform_driver(korina_driver);
1410
1411MODULE_AUTHOR("Philip Rischel <rischelp@idt.com>");
1412MODULE_AUTHOR("Felix Fietkau <nbd@openwrt.org>");
1413MODULE_AUTHOR("Florian Fainelli <florian@openwrt.org>");
1414MODULE_AUTHOR("Roman Yeryomin <roman@advem.lv>");
1415MODULE_DESCRIPTION("IDT RC32434 (Korina) Ethernet driver");
1416MODULE_LICENSE("GPL");
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/ioport.h>
43#include <linux/in.h>
44#include <linux/slab.h>
45#include <linux/string.h>
46#include <linux/delay.h>
47#include <linux/netdevice.h>
48#include <linux/etherdevice.h>
49#include <linux/skbuff.h>
50#include <linux/errno.h>
51#include <linux/platform_device.h>
52#include <linux/mii.h>
53#include <linux/ethtool.h>
54#include <linux/crc32.h>
55
56#include <asm/bootinfo.h>
57#include <asm/bitops.h>
58#include <asm/pgtable.h>
59#include <asm/io.h>
60#include <asm/dma.h>
61
62#include <asm/mach-rc32434/rb.h>
63#include <asm/mach-rc32434/rc32434.h>
64#include <asm/mach-rc32434/eth.h>
65#include <asm/mach-rc32434/dma_v.h>
66
67#define DRV_NAME "korina"
68#define DRV_VERSION "0.10"
69#define DRV_RELDATE "04Mar2008"
70
71#define STATION_ADDRESS_HIGH(dev) (((dev)->dev_addr[0] << 8) | \
72 ((dev)->dev_addr[1]))
73#define STATION_ADDRESS_LOW(dev) (((dev)->dev_addr[2] << 24) | \
74 ((dev)->dev_addr[3] << 16) | \
75 ((dev)->dev_addr[4] << 8) | \
76 ((dev)->dev_addr[5]))
77
78#define MII_CLOCK 1250000 /* no more than 2.5MHz */
79
80/* the following must be powers of two */
81#define KORINA_NUM_RDS 64 /* number of receive descriptors */
82#define KORINA_NUM_TDS 64 /* number of transmit descriptors */
83
84/* KORINA_RBSIZE is the hardware's default maximum receive
85 * frame size in bytes. Having this hardcoded means that there
86 * is no support for MTU sizes greater than 1500. */
87#define KORINA_RBSIZE 1536 /* size of one resource buffer = Ether MTU */
88#define KORINA_RDS_MASK (KORINA_NUM_RDS - 1)
89#define KORINA_TDS_MASK (KORINA_NUM_TDS - 1)
90#define RD_RING_SIZE (KORINA_NUM_RDS * sizeof(struct dma_desc))
91#define TD_RING_SIZE (KORINA_NUM_TDS * sizeof(struct dma_desc))
92
93#define TX_TIMEOUT (6000 * HZ / 1000)
94
95enum chain_status { desc_filled, desc_empty };
96#define IS_DMA_FINISHED(X) (((X) & (DMA_DESC_FINI)) != 0)
97#define IS_DMA_DONE(X) (((X) & (DMA_DESC_DONE)) != 0)
98#define RCVPKT_LENGTH(X) (((X) & ETH_RX_LEN) >> ETH_RX_LEN_BIT)
99
100/* Information that need to be kept for each board. */
101struct korina_private {
102 struct eth_regs *eth_regs;
103 struct dma_reg *rx_dma_regs;
104 struct dma_reg *tx_dma_regs;
105 struct dma_desc *td_ring; /* transmit descriptor ring */
106 struct dma_desc *rd_ring; /* receive descriptor ring */
107
108 struct sk_buff *tx_skb[KORINA_NUM_TDS];
109 struct sk_buff *rx_skb[KORINA_NUM_RDS];
110
111 int rx_next_done;
112 int rx_chain_head;
113 int rx_chain_tail;
114 enum chain_status rx_chain_status;
115
116 int tx_next_done;
117 int tx_chain_head;
118 int tx_chain_tail;
119 enum chain_status tx_chain_status;
120 int tx_count;
121 int tx_full;
122
123 int rx_irq;
124 int tx_irq;
125 int ovr_irq;
126 int und_irq;
127
128 spinlock_t lock; /* NIC xmit lock */
129
130 int dma_halt_cnt;
131 int dma_run_cnt;
132 struct napi_struct napi;
133 struct timer_list media_check_timer;
134 struct mii_if_info mii_if;
135 struct work_struct restart_task;
136 struct net_device *dev;
137 int phy_addr;
138};
139
140extern unsigned int idt_cpu_freq;
141
142static inline void korina_start_dma(struct dma_reg *ch, u32 dma_addr)
143{
144 writel(0, &ch->dmandptr);
145 writel(dma_addr, &ch->dmadptr);
146}
147
148static inline void korina_abort_dma(struct net_device *dev,
149 struct dma_reg *ch)
150{
151 if (readl(&ch->dmac) & DMA_CHAN_RUN_BIT) {
152 writel(0x10, &ch->dmac);
153
154 while (!(readl(&ch->dmas) & DMA_STAT_HALT))
155 netif_trans_update(dev);
156
157 writel(0, &ch->dmas);
158 }
159
160 writel(0, &ch->dmadptr);
161 writel(0, &ch->dmandptr);
162}
163
164static inline void korina_chain_dma(struct dma_reg *ch, u32 dma_addr)
165{
166 writel(dma_addr, &ch->dmandptr);
167}
168
169static void korina_abort_tx(struct net_device *dev)
170{
171 struct korina_private *lp = netdev_priv(dev);
172
173 korina_abort_dma(dev, lp->tx_dma_regs);
174}
175
176static void korina_abort_rx(struct net_device *dev)
177{
178 struct korina_private *lp = netdev_priv(dev);
179
180 korina_abort_dma(dev, lp->rx_dma_regs);
181}
182
183static void korina_start_rx(struct korina_private *lp,
184 struct dma_desc *rd)
185{
186 korina_start_dma(lp->rx_dma_regs, CPHYSADDR(rd));
187}
188
189static void korina_chain_rx(struct korina_private *lp,
190 struct dma_desc *rd)
191{
192 korina_chain_dma(lp->rx_dma_regs, CPHYSADDR(rd));
193}
194
195/* transmit packet */
196static int korina_send_packet(struct sk_buff *skb, struct net_device *dev)
197{
198 struct korina_private *lp = netdev_priv(dev);
199 unsigned long flags;
200 u32 length;
201 u32 chain_prev, chain_next;
202 struct dma_desc *td;
203
204 spin_lock_irqsave(&lp->lock, flags);
205
206 td = &lp->td_ring[lp->tx_chain_tail];
207
208 /* stop queue when full, drop pkts if queue already full */
209 if (lp->tx_count >= (KORINA_NUM_TDS - 2)) {
210 lp->tx_full = 1;
211
212 if (lp->tx_count == (KORINA_NUM_TDS - 2))
213 netif_stop_queue(dev);
214 else {
215 dev->stats.tx_dropped++;
216 dev_kfree_skb_any(skb);
217 spin_unlock_irqrestore(&lp->lock, flags);
218
219 return NETDEV_TX_BUSY;
220 }
221 }
222
223 lp->tx_count++;
224
225 lp->tx_skb[lp->tx_chain_tail] = skb;
226
227 length = skb->len;
228 dma_cache_wback((u32)skb->data, skb->len);
229
230 /* Setup the transmit descriptor. */
231 dma_cache_inv((u32) td, sizeof(*td));
232 td->ca = CPHYSADDR(skb->data);
233 chain_prev = (lp->tx_chain_tail - 1) & KORINA_TDS_MASK;
234 chain_next = (lp->tx_chain_tail + 1) & KORINA_TDS_MASK;
235
236 if (readl(&(lp->tx_dma_regs->dmandptr)) == 0) {
237 if (lp->tx_chain_status == desc_empty) {
238 /* Update tail */
239 td->control = DMA_COUNT(length) |
240 DMA_DESC_COF | DMA_DESC_IOF;
241 /* Move tail */
242 lp->tx_chain_tail = chain_next;
243 /* Write to NDPTR */
244 writel(CPHYSADDR(&lp->td_ring[lp->tx_chain_head]),
245 &lp->tx_dma_regs->dmandptr);
246 /* Move head to tail */
247 lp->tx_chain_head = lp->tx_chain_tail;
248 } else {
249 /* Update tail */
250 td->control = DMA_COUNT(length) |
251 DMA_DESC_COF | DMA_DESC_IOF;
252 /* Link to prev */
253 lp->td_ring[chain_prev].control &=
254 ~DMA_DESC_COF;
255 /* Link to prev */
256 lp->td_ring[chain_prev].link = CPHYSADDR(td);
257 /* Move tail */
258 lp->tx_chain_tail = chain_next;
259 /* Write to NDPTR */
260 writel(CPHYSADDR(&lp->td_ring[lp->tx_chain_head]),
261 &(lp->tx_dma_regs->dmandptr));
262 /* Move head to tail */
263 lp->tx_chain_head = lp->tx_chain_tail;
264 lp->tx_chain_status = desc_empty;
265 }
266 } else {
267 if (lp->tx_chain_status == desc_empty) {
268 /* Update tail */
269 td->control = DMA_COUNT(length) |
270 DMA_DESC_COF | DMA_DESC_IOF;
271 /* Move tail */
272 lp->tx_chain_tail = chain_next;
273 lp->tx_chain_status = desc_filled;
274 } else {
275 /* Update tail */
276 td->control = DMA_COUNT(length) |
277 DMA_DESC_COF | DMA_DESC_IOF;
278 lp->td_ring[chain_prev].control &=
279 ~DMA_DESC_COF;
280 lp->td_ring[chain_prev].link = CPHYSADDR(td);
281 lp->tx_chain_tail = chain_next;
282 }
283 }
284 dma_cache_wback((u32) td, sizeof(*td));
285
286 netif_trans_update(dev);
287 spin_unlock_irqrestore(&lp->lock, flags);
288
289 return NETDEV_TX_OK;
290}
291
292static int mdio_read(struct net_device *dev, int mii_id, int reg)
293{
294 struct korina_private *lp = netdev_priv(dev);
295 int ret;
296
297 mii_id = ((lp->rx_irq == 0x2c ? 1 : 0) << 8);
298
299 writel(0, &lp->eth_regs->miimcfg);
300 writel(0, &lp->eth_regs->miimcmd);
301 writel(mii_id | reg, &lp->eth_regs->miimaddr);
302 writel(ETH_MII_CMD_SCN, &lp->eth_regs->miimcmd);
303
304 ret = (int)(readl(&lp->eth_regs->miimrdd));
305 return ret;
306}
307
308static void mdio_write(struct net_device *dev, int mii_id, int reg, int val)
309{
310 struct korina_private *lp = netdev_priv(dev);
311
312 mii_id = ((lp->rx_irq == 0x2c ? 1 : 0) << 8);
313
314 writel(0, &lp->eth_regs->miimcfg);
315 writel(1, &lp->eth_regs->miimcmd);
316 writel(mii_id | reg, &lp->eth_regs->miimaddr);
317 writel(ETH_MII_CMD_SCN, &lp->eth_regs->miimcmd);
318 writel(val, &lp->eth_regs->miimwtd);
319}
320
321/* Ethernet Rx DMA interrupt */
322static irqreturn_t korina_rx_dma_interrupt(int irq, void *dev_id)
323{
324 struct net_device *dev = dev_id;
325 struct korina_private *lp = netdev_priv(dev);
326 u32 dmas, dmasm;
327 irqreturn_t retval;
328
329 dmas = readl(&lp->rx_dma_regs->dmas);
330 if (dmas & (DMA_STAT_DONE | DMA_STAT_HALT | DMA_STAT_ERR)) {
331 dmasm = readl(&lp->rx_dma_regs->dmasm);
332 writel(dmasm | (DMA_STAT_DONE |
333 DMA_STAT_HALT | DMA_STAT_ERR),
334 &lp->rx_dma_regs->dmasm);
335
336 napi_schedule(&lp->napi);
337
338 if (dmas & DMA_STAT_ERR)
339 printk(KERN_ERR "%s: DMA error\n", dev->name);
340
341 retval = IRQ_HANDLED;
342 } else
343 retval = IRQ_NONE;
344
345 return retval;
346}
347
348static int korina_rx(struct net_device *dev, int limit)
349{
350 struct korina_private *lp = netdev_priv(dev);
351 struct dma_desc *rd = &lp->rd_ring[lp->rx_next_done];
352 struct sk_buff *skb, *skb_new;
353 u8 *pkt_buf;
354 u32 devcs, pkt_len, dmas;
355 int count;
356
357 dma_cache_inv((u32)rd, sizeof(*rd));
358
359 for (count = 0; count < limit; count++) {
360 skb = lp->rx_skb[lp->rx_next_done];
361 skb_new = NULL;
362
363 devcs = rd->devcs;
364
365 if ((KORINA_RBSIZE - (u32)DMA_COUNT(rd->control)) == 0)
366 break;
367
368 /* Update statistics counters */
369 if (devcs & ETH_RX_CRC)
370 dev->stats.rx_crc_errors++;
371 if (devcs & ETH_RX_LOR)
372 dev->stats.rx_length_errors++;
373 if (devcs & ETH_RX_LE)
374 dev->stats.rx_length_errors++;
375 if (devcs & ETH_RX_OVR)
376 dev->stats.rx_fifo_errors++;
377 if (devcs & ETH_RX_CV)
378 dev->stats.rx_frame_errors++;
379 if (devcs & ETH_RX_CES)
380 dev->stats.rx_length_errors++;
381 if (devcs & ETH_RX_MP)
382 dev->stats.multicast++;
383
384 if ((devcs & ETH_RX_LD) != ETH_RX_LD) {
385 /* check that this is a whole packet
386 * WARNING: DMA_FD bit incorrectly set
387 * in Rc32434 (errata ref #077) */
388 dev->stats.rx_errors++;
389 dev->stats.rx_dropped++;
390 } else if ((devcs & ETH_RX_ROK)) {
391 pkt_len = RCVPKT_LENGTH(devcs);
392
393 /* must be the (first and) last
394 * descriptor then */
395 pkt_buf = (u8 *)lp->rx_skb[lp->rx_next_done]->data;
396
397 /* invalidate the cache */
398 dma_cache_inv((unsigned long)pkt_buf, pkt_len - 4);
399
400 /* Malloc up new buffer. */
401 skb_new = netdev_alloc_skb_ip_align(dev, KORINA_RBSIZE);
402
403 if (!skb_new)
404 break;
405 /* Do not count the CRC */
406 skb_put(skb, pkt_len - 4);
407 skb->protocol = eth_type_trans(skb, dev);
408
409 /* Pass the packet to upper layers */
410 netif_receive_skb(skb);
411 dev->stats.rx_packets++;
412 dev->stats.rx_bytes += pkt_len;
413
414 /* Update the mcast stats */
415 if (devcs & ETH_RX_MP)
416 dev->stats.multicast++;
417
418 lp->rx_skb[lp->rx_next_done] = skb_new;
419 }
420
421 rd->devcs = 0;
422
423 /* Restore descriptor's curr_addr */
424 if (skb_new)
425 rd->ca = CPHYSADDR(skb_new->data);
426 else
427 rd->ca = CPHYSADDR(skb->data);
428
429 rd->control = DMA_COUNT(KORINA_RBSIZE) |
430 DMA_DESC_COD | DMA_DESC_IOD;
431 lp->rd_ring[(lp->rx_next_done - 1) &
432 KORINA_RDS_MASK].control &=
433 ~DMA_DESC_COD;
434
435 lp->rx_next_done = (lp->rx_next_done + 1) & KORINA_RDS_MASK;
436 dma_cache_wback((u32)rd, sizeof(*rd));
437 rd = &lp->rd_ring[lp->rx_next_done];
438 writel(~DMA_STAT_DONE, &lp->rx_dma_regs->dmas);
439 }
440
441 dmas = readl(&lp->rx_dma_regs->dmas);
442
443 if (dmas & DMA_STAT_HALT) {
444 writel(~(DMA_STAT_HALT | DMA_STAT_ERR),
445 &lp->rx_dma_regs->dmas);
446
447 lp->dma_halt_cnt++;
448 rd->devcs = 0;
449 skb = lp->rx_skb[lp->rx_next_done];
450 rd->ca = CPHYSADDR(skb->data);
451 dma_cache_wback((u32)rd, sizeof(*rd));
452 korina_chain_rx(lp, rd);
453 }
454
455 return count;
456}
457
458static int korina_poll(struct napi_struct *napi, int budget)
459{
460 struct korina_private *lp =
461 container_of(napi, struct korina_private, napi);
462 struct net_device *dev = lp->dev;
463 int work_done;
464
465 work_done = korina_rx(dev, budget);
466 if (work_done < budget) {
467 napi_complete(napi);
468
469 writel(readl(&lp->rx_dma_regs->dmasm) &
470 ~(DMA_STAT_DONE | DMA_STAT_HALT | DMA_STAT_ERR),
471 &lp->rx_dma_regs->dmasm);
472 }
473 return work_done;
474}
475
476/*
477 * Set or clear the multicast filter for this adaptor.
478 */
479static void korina_multicast_list(struct net_device *dev)
480{
481 struct korina_private *lp = netdev_priv(dev);
482 unsigned long flags;
483 struct netdev_hw_addr *ha;
484 u32 recognise = ETH_ARC_AB; /* always accept broadcasts */
485
486 /* Set promiscuous mode */
487 if (dev->flags & IFF_PROMISC)
488 recognise |= ETH_ARC_PRO;
489
490 else if ((dev->flags & IFF_ALLMULTI) || (netdev_mc_count(dev) > 4))
491 /* All multicast and broadcast */
492 recognise |= ETH_ARC_AM;
493
494 /* Build the hash table */
495 if (netdev_mc_count(dev) > 4) {
496 u16 hash_table[4] = { 0 };
497 u32 crc;
498
499 netdev_for_each_mc_addr(ha, dev) {
500 crc = ether_crc_le(6, ha->addr);
501 crc >>= 26;
502 hash_table[crc >> 4] |= 1 << (15 - (crc & 0xf));
503 }
504 /* Accept filtered multicast */
505 recognise |= ETH_ARC_AFM;
506
507 /* Fill the MAC hash tables with their values */
508 writel((u32)(hash_table[1] << 16 | hash_table[0]),
509 &lp->eth_regs->ethhash0);
510 writel((u32)(hash_table[3] << 16 | hash_table[2]),
511 &lp->eth_regs->ethhash1);
512 }
513
514 spin_lock_irqsave(&lp->lock, flags);
515 writel(recognise, &lp->eth_regs->etharc);
516 spin_unlock_irqrestore(&lp->lock, flags);
517}
518
519static void korina_tx(struct net_device *dev)
520{
521 struct korina_private *lp = netdev_priv(dev);
522 struct dma_desc *td = &lp->td_ring[lp->tx_next_done];
523 u32 devcs;
524 u32 dmas;
525
526 spin_lock(&lp->lock);
527
528 /* Process all desc that are done */
529 while (IS_DMA_FINISHED(td->control)) {
530 if (lp->tx_full == 1) {
531 netif_wake_queue(dev);
532 lp->tx_full = 0;
533 }
534
535 devcs = lp->td_ring[lp->tx_next_done].devcs;
536 if ((devcs & (ETH_TX_FD | ETH_TX_LD)) !=
537 (ETH_TX_FD | ETH_TX_LD)) {
538 dev->stats.tx_errors++;
539 dev->stats.tx_dropped++;
540
541 /* Should never happen */
542 printk(KERN_ERR "%s: split tx ignored\n",
543 dev->name);
544 } else if (devcs & ETH_TX_TOK) {
545 dev->stats.tx_packets++;
546 dev->stats.tx_bytes +=
547 lp->tx_skb[lp->tx_next_done]->len;
548 } else {
549 dev->stats.tx_errors++;
550 dev->stats.tx_dropped++;
551
552 /* Underflow */
553 if (devcs & ETH_TX_UND)
554 dev->stats.tx_fifo_errors++;
555
556 /* Oversized frame */
557 if (devcs & ETH_TX_OF)
558 dev->stats.tx_aborted_errors++;
559
560 /* Excessive deferrals */
561 if (devcs & ETH_TX_ED)
562 dev->stats.tx_carrier_errors++;
563
564 /* Collisions: medium busy */
565 if (devcs & ETH_TX_EC)
566 dev->stats.collisions++;
567
568 /* Late collision */
569 if (devcs & ETH_TX_LC)
570 dev->stats.tx_window_errors++;
571 }
572
573 /* We must always free the original skb */
574 if (lp->tx_skb[lp->tx_next_done]) {
575 dev_kfree_skb_any(lp->tx_skb[lp->tx_next_done]);
576 lp->tx_skb[lp->tx_next_done] = NULL;
577 }
578
579 lp->td_ring[lp->tx_next_done].control = DMA_DESC_IOF;
580 lp->td_ring[lp->tx_next_done].devcs = ETH_TX_FD | ETH_TX_LD;
581 lp->td_ring[lp->tx_next_done].link = 0;
582 lp->td_ring[lp->tx_next_done].ca = 0;
583 lp->tx_count--;
584
585 /* Go on to next transmission */
586 lp->tx_next_done = (lp->tx_next_done + 1) & KORINA_TDS_MASK;
587 td = &lp->td_ring[lp->tx_next_done];
588
589 }
590
591 /* Clear the DMA status register */
592 dmas = readl(&lp->tx_dma_regs->dmas);
593 writel(~dmas, &lp->tx_dma_regs->dmas);
594
595 writel(readl(&lp->tx_dma_regs->dmasm) &
596 ~(DMA_STAT_FINI | DMA_STAT_ERR),
597 &lp->tx_dma_regs->dmasm);
598
599 spin_unlock(&lp->lock);
600}
601
602static irqreturn_t
603korina_tx_dma_interrupt(int irq, void *dev_id)
604{
605 struct net_device *dev = dev_id;
606 struct korina_private *lp = netdev_priv(dev);
607 u32 dmas, dmasm;
608 irqreturn_t retval;
609
610 dmas = readl(&lp->tx_dma_regs->dmas);
611
612 if (dmas & (DMA_STAT_FINI | DMA_STAT_ERR)) {
613 dmasm = readl(&lp->tx_dma_regs->dmasm);
614 writel(dmasm | (DMA_STAT_FINI | DMA_STAT_ERR),
615 &lp->tx_dma_regs->dmasm);
616
617 korina_tx(dev);
618
619 if (lp->tx_chain_status == desc_filled &&
620 (readl(&(lp->tx_dma_regs->dmandptr)) == 0)) {
621 writel(CPHYSADDR(&lp->td_ring[lp->tx_chain_head]),
622 &(lp->tx_dma_regs->dmandptr));
623 lp->tx_chain_status = desc_empty;
624 lp->tx_chain_head = lp->tx_chain_tail;
625 netif_trans_update(dev);
626 }
627 if (dmas & DMA_STAT_ERR)
628 printk(KERN_ERR "%s: DMA error\n", dev->name);
629
630 retval = IRQ_HANDLED;
631 } else
632 retval = IRQ_NONE;
633
634 return retval;
635}
636
637
638static void korina_check_media(struct net_device *dev, unsigned int init_media)
639{
640 struct korina_private *lp = netdev_priv(dev);
641
642 mii_check_media(&lp->mii_if, 0, init_media);
643
644 if (lp->mii_if.full_duplex)
645 writel(readl(&lp->eth_regs->ethmac2) | ETH_MAC2_FD,
646 &lp->eth_regs->ethmac2);
647 else
648 writel(readl(&lp->eth_regs->ethmac2) & ~ETH_MAC2_FD,
649 &lp->eth_regs->ethmac2);
650}
651
652static void korina_poll_media(unsigned long data)
653{
654 struct net_device *dev = (struct net_device *) data;
655 struct korina_private *lp = netdev_priv(dev);
656
657 korina_check_media(dev, 0);
658 mod_timer(&lp->media_check_timer, jiffies + HZ);
659}
660
661static void korina_set_carrier(struct mii_if_info *mii)
662{
663 if (mii->force_media) {
664 /* autoneg is off: Link is always assumed to be up */
665 if (!netif_carrier_ok(mii->dev))
666 netif_carrier_on(mii->dev);
667 } else /* Let MMI library update carrier status */
668 korina_check_media(mii->dev, 0);
669}
670
671static int korina_ioctl(struct net_device *dev, struct ifreq *rq, int cmd)
672{
673 struct korina_private *lp = netdev_priv(dev);
674 struct mii_ioctl_data *data = if_mii(rq);
675 int rc;
676
677 if (!netif_running(dev))
678 return -EINVAL;
679 spin_lock_irq(&lp->lock);
680 rc = generic_mii_ioctl(&lp->mii_if, data, cmd, NULL);
681 spin_unlock_irq(&lp->lock);
682 korina_set_carrier(&lp->mii_if);
683
684 return rc;
685}
686
687/* ethtool helpers */
688static void netdev_get_drvinfo(struct net_device *dev,
689 struct ethtool_drvinfo *info)
690{
691 struct korina_private *lp = netdev_priv(dev);
692
693 strlcpy(info->driver, DRV_NAME, sizeof(info->driver));
694 strlcpy(info->version, DRV_VERSION, sizeof(info->version));
695 strlcpy(info->bus_info, lp->dev->name, sizeof(info->bus_info));
696}
697
698static int netdev_get_settings(struct net_device *dev, struct ethtool_cmd *cmd)
699{
700 struct korina_private *lp = netdev_priv(dev);
701 int rc;
702
703 spin_lock_irq(&lp->lock);
704 rc = mii_ethtool_gset(&lp->mii_if, cmd);
705 spin_unlock_irq(&lp->lock);
706
707 return rc;
708}
709
710static int netdev_set_settings(struct net_device *dev, struct ethtool_cmd *cmd)
711{
712 struct korina_private *lp = netdev_priv(dev);
713 int rc;
714
715 spin_lock_irq(&lp->lock);
716 rc = mii_ethtool_sset(&lp->mii_if, cmd);
717 spin_unlock_irq(&lp->lock);
718 korina_set_carrier(&lp->mii_if);
719
720 return rc;
721}
722
723static u32 netdev_get_link(struct net_device *dev)
724{
725 struct korina_private *lp = netdev_priv(dev);
726
727 return mii_link_ok(&lp->mii_if);
728}
729
730static const struct ethtool_ops netdev_ethtool_ops = {
731 .get_drvinfo = netdev_get_drvinfo,
732 .get_settings = netdev_get_settings,
733 .set_settings = netdev_set_settings,
734 .get_link = netdev_get_link,
735};
736
737static int korina_alloc_ring(struct net_device *dev)
738{
739 struct korina_private *lp = netdev_priv(dev);
740 struct sk_buff *skb;
741 int i;
742
743 /* Initialize the transmit descriptors */
744 for (i = 0; i < KORINA_NUM_TDS; i++) {
745 lp->td_ring[i].control = DMA_DESC_IOF;
746 lp->td_ring[i].devcs = ETH_TX_FD | ETH_TX_LD;
747 lp->td_ring[i].ca = 0;
748 lp->td_ring[i].link = 0;
749 }
750 lp->tx_next_done = lp->tx_chain_head = lp->tx_chain_tail =
751 lp->tx_full = lp->tx_count = 0;
752 lp->tx_chain_status = desc_empty;
753
754 /* Initialize the receive descriptors */
755 for (i = 0; i < KORINA_NUM_RDS; i++) {
756 skb = netdev_alloc_skb_ip_align(dev, KORINA_RBSIZE);
757 if (!skb)
758 return -ENOMEM;
759 lp->rx_skb[i] = skb;
760 lp->rd_ring[i].control = DMA_DESC_IOD |
761 DMA_COUNT(KORINA_RBSIZE);
762 lp->rd_ring[i].devcs = 0;
763 lp->rd_ring[i].ca = CPHYSADDR(skb->data);
764 lp->rd_ring[i].link = CPHYSADDR(&lp->rd_ring[i+1]);
765 }
766
767 /* loop back receive descriptors, so the last
768 * descriptor points to the first one */
769 lp->rd_ring[i - 1].link = CPHYSADDR(&lp->rd_ring[0]);
770 lp->rd_ring[i - 1].control |= DMA_DESC_COD;
771
772 lp->rx_next_done = 0;
773 lp->rx_chain_head = 0;
774 lp->rx_chain_tail = 0;
775 lp->rx_chain_status = desc_empty;
776
777 return 0;
778}
779
780static void korina_free_ring(struct net_device *dev)
781{
782 struct korina_private *lp = netdev_priv(dev);
783 int i;
784
785 for (i = 0; i < KORINA_NUM_RDS; i++) {
786 lp->rd_ring[i].control = 0;
787 if (lp->rx_skb[i])
788 dev_kfree_skb_any(lp->rx_skb[i]);
789 lp->rx_skb[i] = NULL;
790 }
791
792 for (i = 0; i < KORINA_NUM_TDS; i++) {
793 lp->td_ring[i].control = 0;
794 if (lp->tx_skb[i])
795 dev_kfree_skb_any(lp->tx_skb[i]);
796 lp->tx_skb[i] = NULL;
797 }
798}
799
800/*
801 * Initialize the RC32434 ethernet controller.
802 */
803static int korina_init(struct net_device *dev)
804{
805 struct korina_private *lp = netdev_priv(dev);
806
807 /* Disable DMA */
808 korina_abort_tx(dev);
809 korina_abort_rx(dev);
810
811 /* reset ethernet logic */
812 writel(0, &lp->eth_regs->ethintfc);
813 while ((readl(&lp->eth_regs->ethintfc) & ETH_INT_FC_RIP))
814 netif_trans_update(dev);
815
816 /* Enable Ethernet Interface */
817 writel(ETH_INT_FC_EN, &lp->eth_regs->ethintfc);
818
819 /* Allocate rings */
820 if (korina_alloc_ring(dev)) {
821 printk(KERN_ERR "%s: descriptor allocation failed\n", dev->name);
822 korina_free_ring(dev);
823 return -ENOMEM;
824 }
825
826 writel(0, &lp->rx_dma_regs->dmas);
827 /* Start Rx DMA */
828 korina_start_rx(lp, &lp->rd_ring[0]);
829
830 writel(readl(&lp->tx_dma_regs->dmasm) &
831 ~(DMA_STAT_FINI | DMA_STAT_ERR),
832 &lp->tx_dma_regs->dmasm);
833 writel(readl(&lp->rx_dma_regs->dmasm) &
834 ~(DMA_STAT_DONE | DMA_STAT_HALT | DMA_STAT_ERR),
835 &lp->rx_dma_regs->dmasm);
836
837 /* Accept only packets destined for this Ethernet device address */
838 writel(ETH_ARC_AB, &lp->eth_regs->etharc);
839
840 /* Set all Ether station address registers to their initial values */
841 writel(STATION_ADDRESS_LOW(dev), &lp->eth_regs->ethsal0);
842 writel(STATION_ADDRESS_HIGH(dev), &lp->eth_regs->ethsah0);
843
844 writel(STATION_ADDRESS_LOW(dev), &lp->eth_regs->ethsal1);
845 writel(STATION_ADDRESS_HIGH(dev), &lp->eth_regs->ethsah1);
846
847 writel(STATION_ADDRESS_LOW(dev), &lp->eth_regs->ethsal2);
848 writel(STATION_ADDRESS_HIGH(dev), &lp->eth_regs->ethsah2);
849
850 writel(STATION_ADDRESS_LOW(dev), &lp->eth_regs->ethsal3);
851 writel(STATION_ADDRESS_HIGH(dev), &lp->eth_regs->ethsah3);
852
853
854 /* Frame Length Checking, Pad Enable, CRC Enable, Full Duplex set */
855 writel(ETH_MAC2_PE | ETH_MAC2_CEN | ETH_MAC2_FD,
856 &lp->eth_regs->ethmac2);
857
858 /* Back to back inter-packet-gap */
859 writel(0x15, &lp->eth_regs->ethipgt);
860 /* Non - Back to back inter-packet-gap */
861 writel(0x12, &lp->eth_regs->ethipgr);
862
863 /* Management Clock Prescaler Divisor
864 * Clock independent setting */
865 writel(((idt_cpu_freq) / MII_CLOCK + 1) & ~1,
866 &lp->eth_regs->ethmcp);
867
868 /* don't transmit until fifo contains 48b */
869 writel(48, &lp->eth_regs->ethfifott);
870
871 writel(ETH_MAC1_RE, &lp->eth_regs->ethmac1);
872
873 napi_enable(&lp->napi);
874 netif_start_queue(dev);
875
876 return 0;
877}
878
879/*
880 * Restart the RC32434 ethernet controller.
881 */
882static void korina_restart_task(struct work_struct *work)
883{
884 struct korina_private *lp = container_of(work,
885 struct korina_private, restart_task);
886 struct net_device *dev = lp->dev;
887
888 /*
889 * Disable interrupts
890 */
891 disable_irq(lp->rx_irq);
892 disable_irq(lp->tx_irq);
893 disable_irq(lp->ovr_irq);
894 disable_irq(lp->und_irq);
895
896 writel(readl(&lp->tx_dma_regs->dmasm) |
897 DMA_STAT_FINI | DMA_STAT_ERR,
898 &lp->tx_dma_regs->dmasm);
899 writel(readl(&lp->rx_dma_regs->dmasm) |
900 DMA_STAT_DONE | DMA_STAT_HALT | DMA_STAT_ERR,
901 &lp->rx_dma_regs->dmasm);
902
903 napi_disable(&lp->napi);
904
905 korina_free_ring(dev);
906
907 if (korina_init(dev) < 0) {
908 printk(KERN_ERR "%s: cannot restart device\n", dev->name);
909 return;
910 }
911 korina_multicast_list(dev);
912
913 enable_irq(lp->und_irq);
914 enable_irq(lp->ovr_irq);
915 enable_irq(lp->tx_irq);
916 enable_irq(lp->rx_irq);
917}
918
919static void korina_clear_and_restart(struct net_device *dev, u32 value)
920{
921 struct korina_private *lp = netdev_priv(dev);
922
923 netif_stop_queue(dev);
924 writel(value, &lp->eth_regs->ethintfc);
925 schedule_work(&lp->restart_task);
926}
927
928/* Ethernet Tx Underflow interrupt */
929static irqreturn_t korina_und_interrupt(int irq, void *dev_id)
930{
931 struct net_device *dev = dev_id;
932 struct korina_private *lp = netdev_priv(dev);
933 unsigned int und;
934
935 spin_lock(&lp->lock);
936
937 und = readl(&lp->eth_regs->ethintfc);
938
939 if (und & ETH_INT_FC_UND)
940 korina_clear_and_restart(dev, und & ~ETH_INT_FC_UND);
941
942 spin_unlock(&lp->lock);
943
944 return IRQ_HANDLED;
945}
946
947static void korina_tx_timeout(struct net_device *dev)
948{
949 struct korina_private *lp = netdev_priv(dev);
950
951 schedule_work(&lp->restart_task);
952}
953
954/* Ethernet Rx Overflow interrupt */
955static irqreturn_t
956korina_ovr_interrupt(int irq, void *dev_id)
957{
958 struct net_device *dev = dev_id;
959 struct korina_private *lp = netdev_priv(dev);
960 unsigned int ovr;
961
962 spin_lock(&lp->lock);
963 ovr = readl(&lp->eth_regs->ethintfc);
964
965 if (ovr & ETH_INT_FC_OVR)
966 korina_clear_and_restart(dev, ovr & ~ETH_INT_FC_OVR);
967
968 spin_unlock(&lp->lock);
969
970 return IRQ_HANDLED;
971}
972
973#ifdef CONFIG_NET_POLL_CONTROLLER
974static void korina_poll_controller(struct net_device *dev)
975{
976 disable_irq(dev->irq);
977 korina_tx_dma_interrupt(dev->irq, dev);
978 enable_irq(dev->irq);
979}
980#endif
981
982static int korina_open(struct net_device *dev)
983{
984 struct korina_private *lp = netdev_priv(dev);
985 int ret;
986
987 /* Initialize */
988 ret = korina_init(dev);
989 if (ret < 0) {
990 printk(KERN_ERR "%s: cannot open device\n", dev->name);
991 goto out;
992 }
993
994 /* Install the interrupt handler
995 * that handles the Done Finished
996 * Ovr and Und Events */
997 ret = request_irq(lp->rx_irq, korina_rx_dma_interrupt,
998 0, "Korina ethernet Rx", dev);
999 if (ret < 0) {
1000 printk(KERN_ERR "%s: unable to get Rx DMA IRQ %d\n",
1001 dev->name, lp->rx_irq);
1002 goto err_release;
1003 }
1004 ret = request_irq(lp->tx_irq, korina_tx_dma_interrupt,
1005 0, "Korina ethernet Tx", dev);
1006 if (ret < 0) {
1007 printk(KERN_ERR "%s: unable to get Tx DMA IRQ %d\n",
1008 dev->name, lp->tx_irq);
1009 goto err_free_rx_irq;
1010 }
1011
1012 /* Install handler for overrun error. */
1013 ret = request_irq(lp->ovr_irq, korina_ovr_interrupt,
1014 0, "Ethernet Overflow", dev);
1015 if (ret < 0) {
1016 printk(KERN_ERR "%s: unable to get OVR IRQ %d\n",
1017 dev->name, lp->ovr_irq);
1018 goto err_free_tx_irq;
1019 }
1020
1021 /* Install handler for underflow error. */
1022 ret = request_irq(lp->und_irq, korina_und_interrupt,
1023 0, "Ethernet Underflow", dev);
1024 if (ret < 0) {
1025 printk(KERN_ERR "%s: unable to get UND IRQ %d\n",
1026 dev->name, lp->und_irq);
1027 goto err_free_ovr_irq;
1028 }
1029 mod_timer(&lp->media_check_timer, jiffies + 1);
1030out:
1031 return ret;
1032
1033err_free_ovr_irq:
1034 free_irq(lp->ovr_irq, dev);
1035err_free_tx_irq:
1036 free_irq(lp->tx_irq, dev);
1037err_free_rx_irq:
1038 free_irq(lp->rx_irq, dev);
1039err_release:
1040 korina_free_ring(dev);
1041 goto out;
1042}
1043
1044static int korina_close(struct net_device *dev)
1045{
1046 struct korina_private *lp = netdev_priv(dev);
1047 u32 tmp;
1048
1049 del_timer(&lp->media_check_timer);
1050
1051 /* Disable interrupts */
1052 disable_irq(lp->rx_irq);
1053 disable_irq(lp->tx_irq);
1054 disable_irq(lp->ovr_irq);
1055 disable_irq(lp->und_irq);
1056
1057 korina_abort_tx(dev);
1058 tmp = readl(&lp->tx_dma_regs->dmasm);
1059 tmp = tmp | DMA_STAT_FINI | DMA_STAT_ERR;
1060 writel(tmp, &lp->tx_dma_regs->dmasm);
1061
1062 korina_abort_rx(dev);
1063 tmp = readl(&lp->rx_dma_regs->dmasm);
1064 tmp = tmp | DMA_STAT_DONE | DMA_STAT_HALT | DMA_STAT_ERR;
1065 writel(tmp, &lp->rx_dma_regs->dmasm);
1066
1067 napi_disable(&lp->napi);
1068
1069 cancel_work_sync(&lp->restart_task);
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
1081static const struct net_device_ops korina_netdev_ops = {
1082 .ndo_open = korina_open,
1083 .ndo_stop = korina_close,
1084 .ndo_start_xmit = korina_send_packet,
1085 .ndo_set_rx_mode = korina_multicast_list,
1086 .ndo_tx_timeout = korina_tx_timeout,
1087 .ndo_do_ioctl = korina_ioctl,
1088 .ndo_validate_addr = eth_validate_addr,
1089 .ndo_set_mac_address = eth_mac_addr,
1090#ifdef CONFIG_NET_POLL_CONTROLLER
1091 .ndo_poll_controller = korina_poll_controller,
1092#endif
1093};
1094
1095static int korina_probe(struct platform_device *pdev)
1096{
1097 struct korina_device *bif = platform_get_drvdata(pdev);
1098 struct korina_private *lp;
1099 struct net_device *dev;
1100 struct resource *r;
1101 int rc;
1102
1103 dev = alloc_etherdev(sizeof(struct korina_private));
1104 if (!dev)
1105 return -ENOMEM;
1106
1107 SET_NETDEV_DEV(dev, &pdev->dev);
1108 lp = netdev_priv(dev);
1109
1110 bif->dev = dev;
1111 memcpy(dev->dev_addr, bif->mac, ETH_ALEN);
1112
1113 lp->rx_irq = platform_get_irq_byname(pdev, "korina_rx");
1114 lp->tx_irq = platform_get_irq_byname(pdev, "korina_tx");
1115 lp->ovr_irq = platform_get_irq_byname(pdev, "korina_ovr");
1116 lp->und_irq = platform_get_irq_byname(pdev, "korina_und");
1117
1118 r = platform_get_resource_byname(pdev, IORESOURCE_MEM, "korina_regs");
1119 dev->base_addr = r->start;
1120 lp->eth_regs = ioremap_nocache(r->start, resource_size(r));
1121 if (!lp->eth_regs) {
1122 printk(KERN_ERR DRV_NAME ": cannot remap registers\n");
1123 rc = -ENXIO;
1124 goto probe_err_out;
1125 }
1126
1127 r = platform_get_resource_byname(pdev, IORESOURCE_MEM, "korina_dma_rx");
1128 lp->rx_dma_regs = ioremap_nocache(r->start, resource_size(r));
1129 if (!lp->rx_dma_regs) {
1130 printk(KERN_ERR DRV_NAME ": cannot remap Rx DMA registers\n");
1131 rc = -ENXIO;
1132 goto probe_err_dma_rx;
1133 }
1134
1135 r = platform_get_resource_byname(pdev, IORESOURCE_MEM, "korina_dma_tx");
1136 lp->tx_dma_regs = ioremap_nocache(r->start, resource_size(r));
1137 if (!lp->tx_dma_regs) {
1138 printk(KERN_ERR DRV_NAME ": cannot remap Tx DMA registers\n");
1139 rc = -ENXIO;
1140 goto probe_err_dma_tx;
1141 }
1142
1143 lp->td_ring = kmalloc(TD_RING_SIZE + RD_RING_SIZE, GFP_KERNEL);
1144 if (!lp->td_ring) {
1145 rc = -ENXIO;
1146 goto probe_err_td_ring;
1147 }
1148
1149 dma_cache_inv((unsigned long)(lp->td_ring),
1150 TD_RING_SIZE + RD_RING_SIZE);
1151
1152 /* now convert TD_RING pointer to KSEG1 */
1153 lp->td_ring = (struct dma_desc *)KSEG1ADDR(lp->td_ring);
1154 lp->rd_ring = &lp->td_ring[KORINA_NUM_TDS];
1155
1156 spin_lock_init(&lp->lock);
1157 /* just use the rx dma irq */
1158 dev->irq = lp->rx_irq;
1159 lp->dev = dev;
1160
1161 dev->netdev_ops = &korina_netdev_ops;
1162 dev->ethtool_ops = &netdev_ethtool_ops;
1163 dev->watchdog_timeo = TX_TIMEOUT;
1164 netif_napi_add(dev, &lp->napi, korina_poll, 64);
1165
1166 lp->phy_addr = (((lp->rx_irq == 0x2c? 1:0) << 8) | 0x05);
1167 lp->mii_if.dev = dev;
1168 lp->mii_if.mdio_read = mdio_read;
1169 lp->mii_if.mdio_write = mdio_write;
1170 lp->mii_if.phy_id = lp->phy_addr;
1171 lp->mii_if.phy_id_mask = 0x1f;
1172 lp->mii_if.reg_num_mask = 0x1f;
1173
1174 rc = register_netdev(dev);
1175 if (rc < 0) {
1176 printk(KERN_ERR DRV_NAME
1177 ": cannot register net device: %d\n", rc);
1178 goto probe_err_register;
1179 }
1180 setup_timer(&lp->media_check_timer, korina_poll_media, (unsigned long) dev);
1181
1182 INIT_WORK(&lp->restart_task, korina_restart_task);
1183
1184 printk(KERN_INFO "%s: " DRV_NAME "-" DRV_VERSION " " DRV_RELDATE "\n",
1185 dev->name);
1186out:
1187 return rc;
1188
1189probe_err_register:
1190 kfree(lp->td_ring);
1191probe_err_td_ring:
1192 iounmap(lp->tx_dma_regs);
1193probe_err_dma_tx:
1194 iounmap(lp->rx_dma_regs);
1195probe_err_dma_rx:
1196 iounmap(lp->eth_regs);
1197probe_err_out:
1198 free_netdev(dev);
1199 goto out;
1200}
1201
1202static int korina_remove(struct platform_device *pdev)
1203{
1204 struct korina_device *bif = platform_get_drvdata(pdev);
1205 struct korina_private *lp = netdev_priv(bif->dev);
1206
1207 iounmap(lp->eth_regs);
1208 iounmap(lp->rx_dma_regs);
1209 iounmap(lp->tx_dma_regs);
1210
1211 unregister_netdev(bif->dev);
1212 free_netdev(bif->dev);
1213
1214 return 0;
1215}
1216
1217static struct platform_driver korina_driver = {
1218 .driver.name = "korina",
1219 .probe = korina_probe,
1220 .remove = korina_remove,
1221};
1222
1223module_platform_driver(korina_driver);
1224
1225MODULE_AUTHOR("Philip Rischel <rischelp@idt.com>");
1226MODULE_AUTHOR("Felix Fietkau <nbd@openwrt.org>");
1227MODULE_AUTHOR("Florian Fainelli <florian@openwrt.org>");
1228MODULE_DESCRIPTION("IDT RC32434 (Korina) Ethernet driver");
1229MODULE_LICENSE("GPL");