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1/*
2 * ks8842.c timberdale KS8842 ethernet driver
3 * Copyright (c) 2009 Intel Corporation
4 *
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License version 2 as
7 * published by the Free Software Foundation.
8 *
9 * This program is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
13 *
14 * You should have received a copy of the GNU General Public License
15 * along with this program; if not, write to the Free Software
16 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
17 */
18
19/* Supports:
20 * The Micrel KS8842 behind the timberdale FPGA
21 * The genuine Micrel KS8841/42 device with ISA 16/32bit bus interface
22 */
23
24#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
25
26#include <linux/interrupt.h>
27#include <linux/kernel.h>
28#include <linux/module.h>
29#include <linux/platform_device.h>
30#include <linux/netdevice.h>
31#include <linux/etherdevice.h>
32#include <linux/ethtool.h>
33#include <linux/ks8842.h>
34#include <linux/dmaengine.h>
35#include <linux/dma-mapping.h>
36#include <linux/scatterlist.h>
37
38#define DRV_NAME "ks8842"
39
40/* Timberdale specific Registers */
41#define REG_TIMB_RST 0x1c
42#define REG_TIMB_FIFO 0x20
43#define REG_TIMB_ISR 0x24
44#define REG_TIMB_IER 0x28
45#define REG_TIMB_IAR 0x2C
46#define REQ_TIMB_DMA_RESUME 0x30
47
48/* KS8842 registers */
49
50#define REG_SELECT_BANK 0x0e
51
52/* bank 0 registers */
53#define REG_QRFCR 0x04
54
55/* bank 2 registers */
56#define REG_MARL 0x00
57#define REG_MARM 0x02
58#define REG_MARH 0x04
59
60/* bank 3 registers */
61#define REG_GRR 0x06
62
63/* bank 16 registers */
64#define REG_TXCR 0x00
65#define REG_TXSR 0x02
66#define REG_RXCR 0x04
67#define REG_TXMIR 0x08
68#define REG_RXMIR 0x0A
69
70/* bank 17 registers */
71#define REG_TXQCR 0x00
72#define REG_RXQCR 0x02
73#define REG_TXFDPR 0x04
74#define REG_RXFDPR 0x06
75#define REG_QMU_DATA_LO 0x08
76#define REG_QMU_DATA_HI 0x0A
77
78/* bank 18 registers */
79#define REG_IER 0x00
80#define IRQ_LINK_CHANGE 0x8000
81#define IRQ_TX 0x4000
82#define IRQ_RX 0x2000
83#define IRQ_RX_OVERRUN 0x0800
84#define IRQ_TX_STOPPED 0x0200
85#define IRQ_RX_STOPPED 0x0100
86#define IRQ_RX_ERROR 0x0080
87#define ENABLED_IRQS (IRQ_LINK_CHANGE | IRQ_TX | IRQ_RX | IRQ_RX_STOPPED | \
88 IRQ_TX_STOPPED | IRQ_RX_OVERRUN | IRQ_RX_ERROR)
89/* When running via timberdale in DMA mode, the RX interrupt should be
90 enabled in the KS8842, but not in the FPGA IP, since the IP handles
91 RX DMA internally.
92 TX interrupts are not needed it is handled by the FPGA the driver is
93 notified via DMA callbacks.
94*/
95#define ENABLED_IRQS_DMA_IP (IRQ_LINK_CHANGE | IRQ_RX_STOPPED | \
96 IRQ_TX_STOPPED | IRQ_RX_OVERRUN | IRQ_RX_ERROR)
97#define ENABLED_IRQS_DMA (ENABLED_IRQS_DMA_IP | IRQ_RX)
98#define REG_ISR 0x02
99#define REG_RXSR 0x04
100#define RXSR_VALID 0x8000
101#define RXSR_BROADCAST 0x80
102#define RXSR_MULTICAST 0x40
103#define RXSR_UNICAST 0x20
104#define RXSR_FRAMETYPE 0x08
105#define RXSR_TOO_LONG 0x04
106#define RXSR_RUNT 0x02
107#define RXSR_CRC_ERROR 0x01
108#define RXSR_ERROR (RXSR_TOO_LONG | RXSR_RUNT | RXSR_CRC_ERROR)
109
110/* bank 32 registers */
111#define REG_SW_ID_AND_ENABLE 0x00
112#define REG_SGCR1 0x02
113#define REG_SGCR2 0x04
114#define REG_SGCR3 0x06
115
116/* bank 39 registers */
117#define REG_MACAR1 0x00
118#define REG_MACAR2 0x02
119#define REG_MACAR3 0x04
120
121/* bank 45 registers */
122#define REG_P1MBCR 0x00
123#define REG_P1MBSR 0x02
124
125/* bank 46 registers */
126#define REG_P2MBCR 0x00
127#define REG_P2MBSR 0x02
128
129/* bank 48 registers */
130#define REG_P1CR2 0x02
131
132/* bank 49 registers */
133#define REG_P1CR4 0x02
134#define REG_P1SR 0x04
135
136/* flags passed by platform_device for configuration */
137#define MICREL_KS884X 0x01 /* 0=Timeberdale(FPGA), 1=Micrel */
138#define KS884X_16BIT 0x02 /* 1=16bit, 0=32bit */
139
140#define DMA_BUFFER_SIZE 2048
141
142struct ks8842_tx_dma_ctl {
143 struct dma_chan *chan;
144 struct dma_async_tx_descriptor *adesc;
145 void *buf;
146 struct scatterlist sg;
147 int channel;
148};
149
150struct ks8842_rx_dma_ctl {
151 struct dma_chan *chan;
152 struct dma_async_tx_descriptor *adesc;
153 struct sk_buff *skb;
154 struct scatterlist sg;
155 struct tasklet_struct tasklet;
156 int channel;
157};
158
159#define KS8842_USE_DMA(adapter) (((adapter)->dma_tx.channel != -1) && \
160 ((adapter)->dma_rx.channel != -1))
161
162struct ks8842_adapter {
163 void __iomem *hw_addr;
164 int irq;
165 unsigned long conf_flags; /* copy of platform_device config */
166 struct tasklet_struct tasklet;
167 spinlock_t lock; /* spinlock to be interrupt safe */
168 struct work_struct timeout_work;
169 struct net_device *netdev;
170 struct device *dev;
171 struct ks8842_tx_dma_ctl dma_tx;
172 struct ks8842_rx_dma_ctl dma_rx;
173};
174
175static void ks8842_dma_rx_cb(void *data);
176static void ks8842_dma_tx_cb(void *data);
177
178static inline void ks8842_resume_dma(struct ks8842_adapter *adapter)
179{
180 iowrite32(1, adapter->hw_addr + REQ_TIMB_DMA_RESUME);
181}
182
183static inline void ks8842_select_bank(struct ks8842_adapter *adapter, u16 bank)
184{
185 iowrite16(bank, adapter->hw_addr + REG_SELECT_BANK);
186}
187
188static inline void ks8842_write8(struct ks8842_adapter *adapter, u16 bank,
189 u8 value, int offset)
190{
191 ks8842_select_bank(adapter, bank);
192 iowrite8(value, adapter->hw_addr + offset);
193}
194
195static inline void ks8842_write16(struct ks8842_adapter *adapter, u16 bank,
196 u16 value, int offset)
197{
198 ks8842_select_bank(adapter, bank);
199 iowrite16(value, adapter->hw_addr + offset);
200}
201
202static inline void ks8842_enable_bits(struct ks8842_adapter *adapter, u16 bank,
203 u16 bits, int offset)
204{
205 u16 reg;
206 ks8842_select_bank(adapter, bank);
207 reg = ioread16(adapter->hw_addr + offset);
208 reg |= bits;
209 iowrite16(reg, adapter->hw_addr + offset);
210}
211
212static inline void ks8842_clear_bits(struct ks8842_adapter *adapter, u16 bank,
213 u16 bits, int offset)
214{
215 u16 reg;
216 ks8842_select_bank(adapter, bank);
217 reg = ioread16(adapter->hw_addr + offset);
218 reg &= ~bits;
219 iowrite16(reg, adapter->hw_addr + offset);
220}
221
222static inline void ks8842_write32(struct ks8842_adapter *adapter, u16 bank,
223 u32 value, int offset)
224{
225 ks8842_select_bank(adapter, bank);
226 iowrite32(value, adapter->hw_addr + offset);
227}
228
229static inline u8 ks8842_read8(struct ks8842_adapter *adapter, u16 bank,
230 int offset)
231{
232 ks8842_select_bank(adapter, bank);
233 return ioread8(adapter->hw_addr + offset);
234}
235
236static inline u16 ks8842_read16(struct ks8842_adapter *adapter, u16 bank,
237 int offset)
238{
239 ks8842_select_bank(adapter, bank);
240 return ioread16(adapter->hw_addr + offset);
241}
242
243static inline u32 ks8842_read32(struct ks8842_adapter *adapter, u16 bank,
244 int offset)
245{
246 ks8842_select_bank(adapter, bank);
247 return ioread32(adapter->hw_addr + offset);
248}
249
250static void ks8842_reset(struct ks8842_adapter *adapter)
251{
252 if (adapter->conf_flags & MICREL_KS884X) {
253 ks8842_write16(adapter, 3, 1, REG_GRR);
254 msleep(10);
255 iowrite16(0, adapter->hw_addr + REG_GRR);
256 } else {
257 /* The KS8842 goes haywire when doing softare reset
258 * a work around in the timberdale IP is implemented to
259 * do a hardware reset instead
260 ks8842_write16(adapter, 3, 1, REG_GRR);
261 msleep(10);
262 iowrite16(0, adapter->hw_addr + REG_GRR);
263 */
264 iowrite32(0x1, adapter->hw_addr + REG_TIMB_RST);
265 msleep(20);
266 }
267}
268
269static void ks8842_update_link_status(struct net_device *netdev,
270 struct ks8842_adapter *adapter)
271{
272 /* check the status of the link */
273 if (ks8842_read16(adapter, 45, REG_P1MBSR) & 0x4) {
274 netif_carrier_on(netdev);
275 netif_wake_queue(netdev);
276 } else {
277 netif_stop_queue(netdev);
278 netif_carrier_off(netdev);
279 }
280}
281
282static void ks8842_enable_tx(struct ks8842_adapter *adapter)
283{
284 ks8842_enable_bits(adapter, 16, 0x01, REG_TXCR);
285}
286
287static void ks8842_disable_tx(struct ks8842_adapter *adapter)
288{
289 ks8842_clear_bits(adapter, 16, 0x01, REG_TXCR);
290}
291
292static void ks8842_enable_rx(struct ks8842_adapter *adapter)
293{
294 ks8842_enable_bits(adapter, 16, 0x01, REG_RXCR);
295}
296
297static void ks8842_disable_rx(struct ks8842_adapter *adapter)
298{
299 ks8842_clear_bits(adapter, 16, 0x01, REG_RXCR);
300}
301
302static void ks8842_reset_hw(struct ks8842_adapter *adapter)
303{
304 /* reset the HW */
305 ks8842_reset(adapter);
306
307 /* Enable QMU Transmit flow control / transmit padding / Transmit CRC */
308 ks8842_write16(adapter, 16, 0x000E, REG_TXCR);
309
310 /* enable the receiver, uni + multi + broadcast + flow ctrl
311 + crc strip */
312 ks8842_write16(adapter, 16, 0x8 | 0x20 | 0x40 | 0x80 | 0x400,
313 REG_RXCR);
314
315 /* TX frame pointer autoincrement */
316 ks8842_write16(adapter, 17, 0x4000, REG_TXFDPR);
317
318 /* RX frame pointer autoincrement */
319 ks8842_write16(adapter, 17, 0x4000, REG_RXFDPR);
320
321 /* RX 2 kb high watermark */
322 ks8842_write16(adapter, 0, 0x1000, REG_QRFCR);
323
324 /* aggressive back off in half duplex */
325 ks8842_enable_bits(adapter, 32, 1 << 8, REG_SGCR1);
326
327 /* enable no excessive collison drop */
328 ks8842_enable_bits(adapter, 32, 1 << 3, REG_SGCR2);
329
330 /* Enable port 1 force flow control / back pressure / transmit / recv */
331 ks8842_write16(adapter, 48, 0x1E07, REG_P1CR2);
332
333 /* restart port auto-negotiation */
334 ks8842_enable_bits(adapter, 49, 1 << 13, REG_P1CR4);
335
336 /* Enable the transmitter */
337 ks8842_enable_tx(adapter);
338
339 /* Enable the receiver */
340 ks8842_enable_rx(adapter);
341
342 /* clear all interrupts */
343 ks8842_write16(adapter, 18, 0xffff, REG_ISR);
344
345 /* enable interrupts */
346 if (KS8842_USE_DMA(adapter)) {
347 /* When running in DMA Mode the RX interrupt is not enabled in
348 timberdale because RX data is received by DMA callbacks
349 it must still be enabled in the KS8842 because it indicates
350 to timberdale when there is RX data for it's DMA FIFOs */
351 iowrite16(ENABLED_IRQS_DMA_IP, adapter->hw_addr + REG_TIMB_IER);
352 ks8842_write16(adapter, 18, ENABLED_IRQS_DMA, REG_IER);
353 } else {
354 if (!(adapter->conf_flags & MICREL_KS884X))
355 iowrite16(ENABLED_IRQS,
356 adapter->hw_addr + REG_TIMB_IER);
357 ks8842_write16(adapter, 18, ENABLED_IRQS, REG_IER);
358 }
359 /* enable the switch */
360 ks8842_write16(adapter, 32, 0x1, REG_SW_ID_AND_ENABLE);
361}
362
363static void ks8842_read_mac_addr(struct ks8842_adapter *adapter, u8 *dest)
364{
365 int i;
366 u16 mac;
367
368 for (i = 0; i < ETH_ALEN; i++)
369 dest[ETH_ALEN - i - 1] = ks8842_read8(adapter, 2, REG_MARL + i);
370
371 if (adapter->conf_flags & MICREL_KS884X) {
372 /*
373 the sequence of saving mac addr between MAC and Switch is
374 different.
375 */
376
377 mac = ks8842_read16(adapter, 2, REG_MARL);
378 ks8842_write16(adapter, 39, mac, REG_MACAR3);
379 mac = ks8842_read16(adapter, 2, REG_MARM);
380 ks8842_write16(adapter, 39, mac, REG_MACAR2);
381 mac = ks8842_read16(adapter, 2, REG_MARH);
382 ks8842_write16(adapter, 39, mac, REG_MACAR1);
383 } else {
384
385 /* make sure the switch port uses the same MAC as the QMU */
386 mac = ks8842_read16(adapter, 2, REG_MARL);
387 ks8842_write16(adapter, 39, mac, REG_MACAR1);
388 mac = ks8842_read16(adapter, 2, REG_MARM);
389 ks8842_write16(adapter, 39, mac, REG_MACAR2);
390 mac = ks8842_read16(adapter, 2, REG_MARH);
391 ks8842_write16(adapter, 39, mac, REG_MACAR3);
392 }
393}
394
395static void ks8842_write_mac_addr(struct ks8842_adapter *adapter, u8 *mac)
396{
397 unsigned long flags;
398 unsigned i;
399
400 spin_lock_irqsave(&adapter->lock, flags);
401 for (i = 0; i < ETH_ALEN; i++) {
402 ks8842_write8(adapter, 2, mac[ETH_ALEN - i - 1], REG_MARL + i);
403 if (!(adapter->conf_flags & MICREL_KS884X))
404 ks8842_write8(adapter, 39, mac[ETH_ALEN - i - 1],
405 REG_MACAR1 + i);
406 }
407
408 if (adapter->conf_flags & MICREL_KS884X) {
409 /*
410 the sequence of saving mac addr between MAC and Switch is
411 different.
412 */
413
414 u16 mac;
415
416 mac = ks8842_read16(adapter, 2, REG_MARL);
417 ks8842_write16(adapter, 39, mac, REG_MACAR3);
418 mac = ks8842_read16(adapter, 2, REG_MARM);
419 ks8842_write16(adapter, 39, mac, REG_MACAR2);
420 mac = ks8842_read16(adapter, 2, REG_MARH);
421 ks8842_write16(adapter, 39, mac, REG_MACAR1);
422 }
423 spin_unlock_irqrestore(&adapter->lock, flags);
424}
425
426static inline u16 ks8842_tx_fifo_space(struct ks8842_adapter *adapter)
427{
428 return ks8842_read16(adapter, 16, REG_TXMIR) & 0x1fff;
429}
430
431static int ks8842_tx_frame_dma(struct sk_buff *skb, struct net_device *netdev)
432{
433 struct ks8842_adapter *adapter = netdev_priv(netdev);
434 struct ks8842_tx_dma_ctl *ctl = &adapter->dma_tx;
435 u8 *buf = ctl->buf;
436
437 if (ctl->adesc) {
438 netdev_dbg(netdev, "%s: TX ongoing\n", __func__);
439 /* transfer ongoing */
440 return NETDEV_TX_BUSY;
441 }
442
443 sg_dma_len(&ctl->sg) = skb->len + sizeof(u32);
444
445 /* copy data to the TX buffer */
446 /* the control word, enable IRQ, port 1 and the length */
447 *buf++ = 0x00;
448 *buf++ = 0x01; /* Port 1 */
449 *buf++ = skb->len & 0xff;
450 *buf++ = (skb->len >> 8) & 0xff;
451 skb_copy_from_linear_data(skb, buf, skb->len);
452
453 dma_sync_single_range_for_device(adapter->dev,
454 sg_dma_address(&ctl->sg), 0, sg_dma_len(&ctl->sg),
455 DMA_TO_DEVICE);
456
457 /* make sure the length is a multiple of 4 */
458 if (sg_dma_len(&ctl->sg) % 4)
459 sg_dma_len(&ctl->sg) += 4 - sg_dma_len(&ctl->sg) % 4;
460
461 ctl->adesc = dmaengine_prep_slave_sg(ctl->chan,
462 &ctl->sg, 1, DMA_MEM_TO_DEV, DMA_PREP_INTERRUPT);
463 if (!ctl->adesc)
464 return NETDEV_TX_BUSY;
465
466 ctl->adesc->callback_param = netdev;
467 ctl->adesc->callback = ks8842_dma_tx_cb;
468 ctl->adesc->tx_submit(ctl->adesc);
469
470 netdev->stats.tx_bytes += skb->len;
471
472 dev_kfree_skb(skb);
473
474 return NETDEV_TX_OK;
475}
476
477static int ks8842_tx_frame(struct sk_buff *skb, struct net_device *netdev)
478{
479 struct ks8842_adapter *adapter = netdev_priv(netdev);
480 int len = skb->len;
481
482 netdev_dbg(netdev, "%s: len %u head %p data %p tail %p end %p\n",
483 __func__, skb->len, skb->head, skb->data,
484 skb_tail_pointer(skb), skb_end_pointer(skb));
485
486 /* check FIFO buffer space, we need space for CRC and command bits */
487 if (ks8842_tx_fifo_space(adapter) < len + 8)
488 return NETDEV_TX_BUSY;
489
490 if (adapter->conf_flags & KS884X_16BIT) {
491 u16 *ptr16 = (u16 *)skb->data;
492 ks8842_write16(adapter, 17, 0x8000 | 0x100, REG_QMU_DATA_LO);
493 ks8842_write16(adapter, 17, (u16)len, REG_QMU_DATA_HI);
494 netdev->stats.tx_bytes += len;
495
496 /* copy buffer */
497 while (len > 0) {
498 iowrite16(*ptr16++, adapter->hw_addr + REG_QMU_DATA_LO);
499 iowrite16(*ptr16++, adapter->hw_addr + REG_QMU_DATA_HI);
500 len -= sizeof(u32);
501 }
502 } else {
503
504 u32 *ptr = (u32 *)skb->data;
505 u32 ctrl;
506 /* the control word, enable IRQ, port 1 and the length */
507 ctrl = 0x8000 | 0x100 | (len << 16);
508 ks8842_write32(adapter, 17, ctrl, REG_QMU_DATA_LO);
509
510 netdev->stats.tx_bytes += len;
511
512 /* copy buffer */
513 while (len > 0) {
514 iowrite32(*ptr, adapter->hw_addr + REG_QMU_DATA_LO);
515 len -= sizeof(u32);
516 ptr++;
517 }
518 }
519
520 /* enqueue packet */
521 ks8842_write16(adapter, 17, 1, REG_TXQCR);
522
523 dev_kfree_skb(skb);
524
525 return NETDEV_TX_OK;
526}
527
528static void ks8842_update_rx_err_counters(struct net_device *netdev, u32 status)
529{
530 netdev_dbg(netdev, "RX error, status: %x\n", status);
531
532 netdev->stats.rx_errors++;
533 if (status & RXSR_TOO_LONG)
534 netdev->stats.rx_length_errors++;
535 if (status & RXSR_CRC_ERROR)
536 netdev->stats.rx_crc_errors++;
537 if (status & RXSR_RUNT)
538 netdev->stats.rx_frame_errors++;
539}
540
541static void ks8842_update_rx_counters(struct net_device *netdev, u32 status,
542 int len)
543{
544 netdev_dbg(netdev, "RX packet, len: %d\n", len);
545
546 netdev->stats.rx_packets++;
547 netdev->stats.rx_bytes += len;
548 if (status & RXSR_MULTICAST)
549 netdev->stats.multicast++;
550}
551
552static int __ks8842_start_new_rx_dma(struct net_device *netdev)
553{
554 struct ks8842_adapter *adapter = netdev_priv(netdev);
555 struct ks8842_rx_dma_ctl *ctl = &adapter->dma_rx;
556 struct scatterlist *sg = &ctl->sg;
557 int err;
558
559 ctl->skb = netdev_alloc_skb(netdev, DMA_BUFFER_SIZE);
560 if (ctl->skb) {
561 sg_init_table(sg, 1);
562 sg_dma_address(sg) = dma_map_single(adapter->dev,
563 ctl->skb->data, DMA_BUFFER_SIZE, DMA_FROM_DEVICE);
564 if (dma_mapping_error(adapter->dev, sg_dma_address(sg))) {
565 err = -ENOMEM;
566 sg_dma_address(sg) = 0;
567 goto out;
568 }
569
570 sg_dma_len(sg) = DMA_BUFFER_SIZE;
571
572 ctl->adesc = dmaengine_prep_slave_sg(ctl->chan,
573 sg, 1, DMA_DEV_TO_MEM, DMA_PREP_INTERRUPT);
574
575 if (!ctl->adesc) {
576 err = -ENOMEM;
577 goto out;
578 }
579
580 ctl->adesc->callback_param = netdev;
581 ctl->adesc->callback = ks8842_dma_rx_cb;
582 ctl->adesc->tx_submit(ctl->adesc);
583 } else {
584 err = -ENOMEM;
585 sg_dma_address(sg) = 0;
586 goto out;
587 }
588
589 return 0;
590out:
591 if (sg_dma_address(sg))
592 dma_unmap_single(adapter->dev, sg_dma_address(sg),
593 DMA_BUFFER_SIZE, DMA_FROM_DEVICE);
594 sg_dma_address(sg) = 0;
595 if (ctl->skb)
596 dev_kfree_skb(ctl->skb);
597
598 ctl->skb = NULL;
599
600 printk(KERN_ERR DRV_NAME": Failed to start RX DMA: %d\n", err);
601 return err;
602}
603
604static void ks8842_rx_frame_dma_tasklet(unsigned long arg)
605{
606 struct net_device *netdev = (struct net_device *)arg;
607 struct ks8842_adapter *adapter = netdev_priv(netdev);
608 struct ks8842_rx_dma_ctl *ctl = &adapter->dma_rx;
609 struct sk_buff *skb = ctl->skb;
610 dma_addr_t addr = sg_dma_address(&ctl->sg);
611 u32 status;
612
613 ctl->adesc = NULL;
614
615 /* kick next transfer going */
616 __ks8842_start_new_rx_dma(netdev);
617
618 /* now handle the data we got */
619 dma_unmap_single(adapter->dev, addr, DMA_BUFFER_SIZE, DMA_FROM_DEVICE);
620
621 status = *((u32 *)skb->data);
622
623 netdev_dbg(netdev, "%s - rx_data: status: %x\n",
624 __func__, status & 0xffff);
625
626 /* check the status */
627 if ((status & RXSR_VALID) && !(status & RXSR_ERROR)) {
628 int len = (status >> 16) & 0x7ff;
629
630 ks8842_update_rx_counters(netdev, status, len);
631
632 /* reserve 4 bytes which is the status word */
633 skb_reserve(skb, 4);
634 skb_put(skb, len);
635
636 skb->protocol = eth_type_trans(skb, netdev);
637 netif_rx(skb);
638 } else {
639 ks8842_update_rx_err_counters(netdev, status);
640 dev_kfree_skb(skb);
641 }
642}
643
644static void ks8842_rx_frame(struct net_device *netdev,
645 struct ks8842_adapter *adapter)
646{
647 u32 status;
648 int len;
649
650 if (adapter->conf_flags & KS884X_16BIT) {
651 status = ks8842_read16(adapter, 17, REG_QMU_DATA_LO);
652 len = ks8842_read16(adapter, 17, REG_QMU_DATA_HI);
653 netdev_dbg(netdev, "%s - rx_data: status: %x\n",
654 __func__, status);
655 } else {
656 status = ks8842_read32(adapter, 17, REG_QMU_DATA_LO);
657 len = (status >> 16) & 0x7ff;
658 status &= 0xffff;
659 netdev_dbg(netdev, "%s - rx_data: status: %x\n",
660 __func__, status);
661 }
662
663 /* check the status */
664 if ((status & RXSR_VALID) && !(status & RXSR_ERROR)) {
665 struct sk_buff *skb = netdev_alloc_skb_ip_align(netdev, len + 3);
666
667 if (skb) {
668
669 ks8842_update_rx_counters(netdev, status, len);
670
671 if (adapter->conf_flags & KS884X_16BIT) {
672 u16 *data16 = skb_put(skb, len);
673 ks8842_select_bank(adapter, 17);
674 while (len > 0) {
675 *data16++ = ioread16(adapter->hw_addr +
676 REG_QMU_DATA_LO);
677 *data16++ = ioread16(adapter->hw_addr +
678 REG_QMU_DATA_HI);
679 len -= sizeof(u32);
680 }
681 } else {
682 u32 *data = skb_put(skb, len);
683
684 ks8842_select_bank(adapter, 17);
685 while (len > 0) {
686 *data++ = ioread32(adapter->hw_addr +
687 REG_QMU_DATA_LO);
688 len -= sizeof(u32);
689 }
690 }
691 skb->protocol = eth_type_trans(skb, netdev);
692 netif_rx(skb);
693 } else
694 netdev->stats.rx_dropped++;
695 } else
696 ks8842_update_rx_err_counters(netdev, status);
697
698 /* set high watermark to 3K */
699 ks8842_clear_bits(adapter, 0, 1 << 12, REG_QRFCR);
700
701 /* release the frame */
702 ks8842_write16(adapter, 17, 0x01, REG_RXQCR);
703
704 /* set high watermark to 2K */
705 ks8842_enable_bits(adapter, 0, 1 << 12, REG_QRFCR);
706}
707
708static void ks8842_handle_rx(struct net_device *netdev,
709 struct ks8842_adapter *adapter)
710{
711 u16 rx_data = ks8842_read16(adapter, 16, REG_RXMIR) & 0x1fff;
712 netdev_dbg(netdev, "%s Entry - rx_data: %d\n", __func__, rx_data);
713 while (rx_data) {
714 ks8842_rx_frame(netdev, adapter);
715 rx_data = ks8842_read16(adapter, 16, REG_RXMIR) & 0x1fff;
716 }
717}
718
719static void ks8842_handle_tx(struct net_device *netdev,
720 struct ks8842_adapter *adapter)
721{
722 u16 sr = ks8842_read16(adapter, 16, REG_TXSR);
723 netdev_dbg(netdev, "%s - entry, sr: %x\n", __func__, sr);
724 netdev->stats.tx_packets++;
725 if (netif_queue_stopped(netdev))
726 netif_wake_queue(netdev);
727}
728
729static void ks8842_handle_rx_overrun(struct net_device *netdev,
730 struct ks8842_adapter *adapter)
731{
732 netdev_dbg(netdev, "%s: entry\n", __func__);
733 netdev->stats.rx_errors++;
734 netdev->stats.rx_fifo_errors++;
735}
736
737static void ks8842_tasklet(unsigned long arg)
738{
739 struct net_device *netdev = (struct net_device *)arg;
740 struct ks8842_adapter *adapter = netdev_priv(netdev);
741 u16 isr;
742 unsigned long flags;
743 u16 entry_bank;
744
745 /* read current bank to be able to set it back */
746 spin_lock_irqsave(&adapter->lock, flags);
747 entry_bank = ioread16(adapter->hw_addr + REG_SELECT_BANK);
748 spin_unlock_irqrestore(&adapter->lock, flags);
749
750 isr = ks8842_read16(adapter, 18, REG_ISR);
751 netdev_dbg(netdev, "%s - ISR: 0x%x\n", __func__, isr);
752
753 /* when running in DMA mode, do not ack RX interrupts, it is handled
754 internally by timberdale, otherwise it's DMA FIFO:s would stop
755 */
756 if (KS8842_USE_DMA(adapter))
757 isr &= ~IRQ_RX;
758
759 /* Ack */
760 ks8842_write16(adapter, 18, isr, REG_ISR);
761
762 if (!(adapter->conf_flags & MICREL_KS884X))
763 /* Ack in the timberdale IP as well */
764 iowrite32(0x1, adapter->hw_addr + REG_TIMB_IAR);
765
766 if (!netif_running(netdev))
767 return;
768
769 if (isr & IRQ_LINK_CHANGE)
770 ks8842_update_link_status(netdev, adapter);
771
772 /* should not get IRQ_RX when running DMA mode */
773 if (isr & (IRQ_RX | IRQ_RX_ERROR) && !KS8842_USE_DMA(adapter))
774 ks8842_handle_rx(netdev, adapter);
775
776 /* should only happen when in PIO mode */
777 if (isr & IRQ_TX)
778 ks8842_handle_tx(netdev, adapter);
779
780 if (isr & IRQ_RX_OVERRUN)
781 ks8842_handle_rx_overrun(netdev, adapter);
782
783 if (isr & IRQ_TX_STOPPED) {
784 ks8842_disable_tx(adapter);
785 ks8842_enable_tx(adapter);
786 }
787
788 if (isr & IRQ_RX_STOPPED) {
789 ks8842_disable_rx(adapter);
790 ks8842_enable_rx(adapter);
791 }
792
793 /* re-enable interrupts, put back the bank selection register */
794 spin_lock_irqsave(&adapter->lock, flags);
795 if (KS8842_USE_DMA(adapter))
796 ks8842_write16(adapter, 18, ENABLED_IRQS_DMA, REG_IER);
797 else
798 ks8842_write16(adapter, 18, ENABLED_IRQS, REG_IER);
799 iowrite16(entry_bank, adapter->hw_addr + REG_SELECT_BANK);
800
801 /* Make sure timberdale continues DMA operations, they are stopped while
802 we are handling the ks8842 because we might change bank */
803 if (KS8842_USE_DMA(adapter))
804 ks8842_resume_dma(adapter);
805
806 spin_unlock_irqrestore(&adapter->lock, flags);
807}
808
809static irqreturn_t ks8842_irq(int irq, void *devid)
810{
811 struct net_device *netdev = devid;
812 struct ks8842_adapter *adapter = netdev_priv(netdev);
813 u16 isr;
814 u16 entry_bank = ioread16(adapter->hw_addr + REG_SELECT_BANK);
815 irqreturn_t ret = IRQ_NONE;
816
817 isr = ks8842_read16(adapter, 18, REG_ISR);
818 netdev_dbg(netdev, "%s - ISR: 0x%x\n", __func__, isr);
819
820 if (isr) {
821 if (KS8842_USE_DMA(adapter))
822 /* disable all but RX IRQ, since the FPGA relies on it*/
823 ks8842_write16(adapter, 18, IRQ_RX, REG_IER);
824 else
825 /* disable IRQ */
826 ks8842_write16(adapter, 18, 0x00, REG_IER);
827
828 /* schedule tasklet */
829 tasklet_schedule(&adapter->tasklet);
830
831 ret = IRQ_HANDLED;
832 }
833
834 iowrite16(entry_bank, adapter->hw_addr + REG_SELECT_BANK);
835
836 /* After an interrupt, tell timberdale to continue DMA operations.
837 DMA is disabled while we are handling the ks8842 because we might
838 change bank */
839 ks8842_resume_dma(adapter);
840
841 return ret;
842}
843
844static void ks8842_dma_rx_cb(void *data)
845{
846 struct net_device *netdev = data;
847 struct ks8842_adapter *adapter = netdev_priv(netdev);
848
849 netdev_dbg(netdev, "RX DMA finished\n");
850 /* schedule tasklet */
851 if (adapter->dma_rx.adesc)
852 tasklet_schedule(&adapter->dma_rx.tasklet);
853}
854
855static void ks8842_dma_tx_cb(void *data)
856{
857 struct net_device *netdev = data;
858 struct ks8842_adapter *adapter = netdev_priv(netdev);
859 struct ks8842_tx_dma_ctl *ctl = &adapter->dma_tx;
860
861 netdev_dbg(netdev, "TX DMA finished\n");
862
863 if (!ctl->adesc)
864 return;
865
866 netdev->stats.tx_packets++;
867 ctl->adesc = NULL;
868
869 if (netif_queue_stopped(netdev))
870 netif_wake_queue(netdev);
871}
872
873static void ks8842_stop_dma(struct ks8842_adapter *adapter)
874{
875 struct ks8842_tx_dma_ctl *tx_ctl = &adapter->dma_tx;
876 struct ks8842_rx_dma_ctl *rx_ctl = &adapter->dma_rx;
877
878 tx_ctl->adesc = NULL;
879 if (tx_ctl->chan)
880 dmaengine_terminate_all(tx_ctl->chan);
881
882 rx_ctl->adesc = NULL;
883 if (rx_ctl->chan)
884 dmaengine_terminate_all(rx_ctl->chan);
885
886 if (sg_dma_address(&rx_ctl->sg))
887 dma_unmap_single(adapter->dev, sg_dma_address(&rx_ctl->sg),
888 DMA_BUFFER_SIZE, DMA_FROM_DEVICE);
889 sg_dma_address(&rx_ctl->sg) = 0;
890
891 dev_kfree_skb(rx_ctl->skb);
892 rx_ctl->skb = NULL;
893}
894
895static void ks8842_dealloc_dma_bufs(struct ks8842_adapter *adapter)
896{
897 struct ks8842_tx_dma_ctl *tx_ctl = &adapter->dma_tx;
898 struct ks8842_rx_dma_ctl *rx_ctl = &adapter->dma_rx;
899
900 ks8842_stop_dma(adapter);
901
902 if (tx_ctl->chan)
903 dma_release_channel(tx_ctl->chan);
904 tx_ctl->chan = NULL;
905
906 if (rx_ctl->chan)
907 dma_release_channel(rx_ctl->chan);
908 rx_ctl->chan = NULL;
909
910 tasklet_kill(&rx_ctl->tasklet);
911
912 if (sg_dma_address(&tx_ctl->sg))
913 dma_unmap_single(adapter->dev, sg_dma_address(&tx_ctl->sg),
914 DMA_BUFFER_SIZE, DMA_TO_DEVICE);
915 sg_dma_address(&tx_ctl->sg) = 0;
916
917 kfree(tx_ctl->buf);
918 tx_ctl->buf = NULL;
919}
920
921static bool ks8842_dma_filter_fn(struct dma_chan *chan, void *filter_param)
922{
923 return chan->chan_id == (long)filter_param;
924}
925
926static int ks8842_alloc_dma_bufs(struct net_device *netdev)
927{
928 struct ks8842_adapter *adapter = netdev_priv(netdev);
929 struct ks8842_tx_dma_ctl *tx_ctl = &adapter->dma_tx;
930 struct ks8842_rx_dma_ctl *rx_ctl = &adapter->dma_rx;
931 int err;
932
933 dma_cap_mask_t mask;
934
935 dma_cap_zero(mask);
936 dma_cap_set(DMA_SLAVE, mask);
937 dma_cap_set(DMA_PRIVATE, mask);
938
939 sg_init_table(&tx_ctl->sg, 1);
940
941 tx_ctl->chan = dma_request_channel(mask, ks8842_dma_filter_fn,
942 (void *)(long)tx_ctl->channel);
943 if (!tx_ctl->chan) {
944 err = -ENODEV;
945 goto err;
946 }
947
948 /* allocate DMA buffer */
949 tx_ctl->buf = kmalloc(DMA_BUFFER_SIZE, GFP_KERNEL);
950 if (!tx_ctl->buf) {
951 err = -ENOMEM;
952 goto err;
953 }
954
955 sg_dma_address(&tx_ctl->sg) = dma_map_single(adapter->dev,
956 tx_ctl->buf, DMA_BUFFER_SIZE, DMA_TO_DEVICE);
957 if (dma_mapping_error(adapter->dev, sg_dma_address(&tx_ctl->sg))) {
958 err = -ENOMEM;
959 sg_dma_address(&tx_ctl->sg) = 0;
960 goto err;
961 }
962
963 rx_ctl->chan = dma_request_channel(mask, ks8842_dma_filter_fn,
964 (void *)(long)rx_ctl->channel);
965 if (!rx_ctl->chan) {
966 err = -ENODEV;
967 goto err;
968 }
969
970 tasklet_init(&rx_ctl->tasklet, ks8842_rx_frame_dma_tasklet,
971 (unsigned long)netdev);
972
973 return 0;
974err:
975 ks8842_dealloc_dma_bufs(adapter);
976 return err;
977}
978
979/* Netdevice operations */
980
981static int ks8842_open(struct net_device *netdev)
982{
983 struct ks8842_adapter *adapter = netdev_priv(netdev);
984 int err;
985
986 netdev_dbg(netdev, "%s - entry\n", __func__);
987
988 if (KS8842_USE_DMA(adapter)) {
989 err = ks8842_alloc_dma_bufs(netdev);
990
991 if (!err) {
992 /* start RX dma */
993 err = __ks8842_start_new_rx_dma(netdev);
994 if (err)
995 ks8842_dealloc_dma_bufs(adapter);
996 }
997
998 if (err) {
999 printk(KERN_WARNING DRV_NAME
1000 ": Failed to initiate DMA, running PIO\n");
1001 ks8842_dealloc_dma_bufs(adapter);
1002 adapter->dma_rx.channel = -1;
1003 adapter->dma_tx.channel = -1;
1004 }
1005 }
1006
1007 /* reset the HW */
1008 ks8842_reset_hw(adapter);
1009
1010 ks8842_write_mac_addr(adapter, netdev->dev_addr);
1011
1012 ks8842_update_link_status(netdev, adapter);
1013
1014 err = request_irq(adapter->irq, ks8842_irq, IRQF_SHARED, DRV_NAME,
1015 netdev);
1016 if (err) {
1017 pr_err("Failed to request IRQ: %d: %d\n", adapter->irq, err);
1018 return err;
1019 }
1020
1021 return 0;
1022}
1023
1024static int ks8842_close(struct net_device *netdev)
1025{
1026 struct ks8842_adapter *adapter = netdev_priv(netdev);
1027
1028 netdev_dbg(netdev, "%s - entry\n", __func__);
1029
1030 cancel_work_sync(&adapter->timeout_work);
1031
1032 if (KS8842_USE_DMA(adapter))
1033 ks8842_dealloc_dma_bufs(adapter);
1034
1035 /* free the irq */
1036 free_irq(adapter->irq, netdev);
1037
1038 /* disable the switch */
1039 ks8842_write16(adapter, 32, 0x0, REG_SW_ID_AND_ENABLE);
1040
1041 return 0;
1042}
1043
1044static netdev_tx_t ks8842_xmit_frame(struct sk_buff *skb,
1045 struct net_device *netdev)
1046{
1047 int ret;
1048 struct ks8842_adapter *adapter = netdev_priv(netdev);
1049
1050 netdev_dbg(netdev, "%s: entry\n", __func__);
1051
1052 if (KS8842_USE_DMA(adapter)) {
1053 unsigned long flags;
1054 ret = ks8842_tx_frame_dma(skb, netdev);
1055 /* for now only allow one transfer at the time */
1056 spin_lock_irqsave(&adapter->lock, flags);
1057 if (adapter->dma_tx.adesc)
1058 netif_stop_queue(netdev);
1059 spin_unlock_irqrestore(&adapter->lock, flags);
1060 return ret;
1061 }
1062
1063 ret = ks8842_tx_frame(skb, netdev);
1064
1065 if (ks8842_tx_fifo_space(adapter) < netdev->mtu + 8)
1066 netif_stop_queue(netdev);
1067
1068 return ret;
1069}
1070
1071static int ks8842_set_mac(struct net_device *netdev, void *p)
1072{
1073 struct ks8842_adapter *adapter = netdev_priv(netdev);
1074 struct sockaddr *addr = p;
1075 char *mac = (u8 *)addr->sa_data;
1076
1077 netdev_dbg(netdev, "%s: entry\n", __func__);
1078
1079 if (!is_valid_ether_addr(addr->sa_data))
1080 return -EADDRNOTAVAIL;
1081
1082 memcpy(netdev->dev_addr, mac, netdev->addr_len);
1083
1084 ks8842_write_mac_addr(adapter, mac);
1085 return 0;
1086}
1087
1088static void ks8842_tx_timeout_work(struct work_struct *work)
1089{
1090 struct ks8842_adapter *adapter =
1091 container_of(work, struct ks8842_adapter, timeout_work);
1092 struct net_device *netdev = adapter->netdev;
1093 unsigned long flags;
1094
1095 netdev_dbg(netdev, "%s: entry\n", __func__);
1096
1097 spin_lock_irqsave(&adapter->lock, flags);
1098
1099 if (KS8842_USE_DMA(adapter))
1100 ks8842_stop_dma(adapter);
1101
1102 /* disable interrupts */
1103 ks8842_write16(adapter, 18, 0, REG_IER);
1104 ks8842_write16(adapter, 18, 0xFFFF, REG_ISR);
1105
1106 netif_stop_queue(netdev);
1107
1108 spin_unlock_irqrestore(&adapter->lock, flags);
1109
1110 ks8842_reset_hw(adapter);
1111
1112 ks8842_write_mac_addr(adapter, netdev->dev_addr);
1113
1114 ks8842_update_link_status(netdev, adapter);
1115
1116 if (KS8842_USE_DMA(adapter))
1117 __ks8842_start_new_rx_dma(netdev);
1118}
1119
1120static void ks8842_tx_timeout(struct net_device *netdev)
1121{
1122 struct ks8842_adapter *adapter = netdev_priv(netdev);
1123
1124 netdev_dbg(netdev, "%s: entry\n", __func__);
1125
1126 schedule_work(&adapter->timeout_work);
1127}
1128
1129static const struct net_device_ops ks8842_netdev_ops = {
1130 .ndo_open = ks8842_open,
1131 .ndo_stop = ks8842_close,
1132 .ndo_start_xmit = ks8842_xmit_frame,
1133 .ndo_set_mac_address = ks8842_set_mac,
1134 .ndo_tx_timeout = ks8842_tx_timeout,
1135 .ndo_validate_addr = eth_validate_addr
1136};
1137
1138static const struct ethtool_ops ks8842_ethtool_ops = {
1139 .get_link = ethtool_op_get_link,
1140};
1141
1142static int ks8842_probe(struct platform_device *pdev)
1143{
1144 int err = -ENOMEM;
1145 struct resource *iomem;
1146 struct net_device *netdev;
1147 struct ks8842_adapter *adapter;
1148 struct ks8842_platform_data *pdata = dev_get_platdata(&pdev->dev);
1149 u16 id;
1150 unsigned i;
1151
1152 iomem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1153 if (!request_mem_region(iomem->start, resource_size(iomem), DRV_NAME))
1154 goto err_mem_region;
1155
1156 netdev = alloc_etherdev(sizeof(struct ks8842_adapter));
1157 if (!netdev)
1158 goto err_alloc_etherdev;
1159
1160 SET_NETDEV_DEV(netdev, &pdev->dev);
1161
1162 adapter = netdev_priv(netdev);
1163 adapter->netdev = netdev;
1164 INIT_WORK(&adapter->timeout_work, ks8842_tx_timeout_work);
1165 adapter->hw_addr = ioremap(iomem->start, resource_size(iomem));
1166 adapter->conf_flags = iomem->flags;
1167
1168 if (!adapter->hw_addr)
1169 goto err_ioremap;
1170
1171 adapter->irq = platform_get_irq(pdev, 0);
1172 if (adapter->irq < 0) {
1173 err = adapter->irq;
1174 goto err_get_irq;
1175 }
1176
1177 adapter->dev = (pdev->dev.parent) ? pdev->dev.parent : &pdev->dev;
1178
1179 /* DMA is only supported when accessed via timberdale */
1180 if (!(adapter->conf_flags & MICREL_KS884X) && pdata &&
1181 (pdata->tx_dma_channel != -1) &&
1182 (pdata->rx_dma_channel != -1)) {
1183 adapter->dma_rx.channel = pdata->rx_dma_channel;
1184 adapter->dma_tx.channel = pdata->tx_dma_channel;
1185 } else {
1186 adapter->dma_rx.channel = -1;
1187 adapter->dma_tx.channel = -1;
1188 }
1189
1190 tasklet_init(&adapter->tasklet, ks8842_tasklet, (unsigned long)netdev);
1191 spin_lock_init(&adapter->lock);
1192
1193 netdev->netdev_ops = &ks8842_netdev_ops;
1194 netdev->ethtool_ops = &ks8842_ethtool_ops;
1195
1196 /* Check if a mac address was given */
1197 i = netdev->addr_len;
1198 if (pdata) {
1199 for (i = 0; i < netdev->addr_len; i++)
1200 if (pdata->macaddr[i] != 0)
1201 break;
1202
1203 if (i < netdev->addr_len)
1204 /* an address was passed, use it */
1205 memcpy(netdev->dev_addr, pdata->macaddr,
1206 netdev->addr_len);
1207 }
1208
1209 if (i == netdev->addr_len) {
1210 ks8842_read_mac_addr(adapter, netdev->dev_addr);
1211
1212 if (!is_valid_ether_addr(netdev->dev_addr))
1213 eth_hw_addr_random(netdev);
1214 }
1215
1216 id = ks8842_read16(adapter, 32, REG_SW_ID_AND_ENABLE);
1217
1218 strcpy(netdev->name, "eth%d");
1219 err = register_netdev(netdev);
1220 if (err)
1221 goto err_register;
1222
1223 platform_set_drvdata(pdev, netdev);
1224
1225 pr_info("Found chip, family: 0x%x, id: 0x%x, rev: 0x%x\n",
1226 (id >> 8) & 0xff, (id >> 4) & 0xf, (id >> 1) & 0x7);
1227
1228 return 0;
1229
1230err_register:
1231err_get_irq:
1232 iounmap(adapter->hw_addr);
1233err_ioremap:
1234 free_netdev(netdev);
1235err_alloc_etherdev:
1236 release_mem_region(iomem->start, resource_size(iomem));
1237err_mem_region:
1238 return err;
1239}
1240
1241static int ks8842_remove(struct platform_device *pdev)
1242{
1243 struct net_device *netdev = platform_get_drvdata(pdev);
1244 struct ks8842_adapter *adapter = netdev_priv(netdev);
1245 struct resource *iomem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1246
1247 unregister_netdev(netdev);
1248 tasklet_kill(&adapter->tasklet);
1249 iounmap(adapter->hw_addr);
1250 free_netdev(netdev);
1251 release_mem_region(iomem->start, resource_size(iomem));
1252 return 0;
1253}
1254
1255
1256static struct platform_driver ks8842_platform_driver = {
1257 .driver = {
1258 .name = DRV_NAME,
1259 },
1260 .probe = ks8842_probe,
1261 .remove = ks8842_remove,
1262};
1263
1264module_platform_driver(ks8842_platform_driver);
1265
1266MODULE_DESCRIPTION("Timberdale KS8842 ethernet driver");
1267MODULE_AUTHOR("Mocean Laboratories <info@mocean-labs.com>");
1268MODULE_LICENSE("GPL v2");
1269MODULE_ALIAS("platform:ks8842");
1270