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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 = ctl->chan->device->device_prep_slave_sg(ctl->chan,
462 &ctl->sg, 1, DMA_TO_DEVICE,
463 DMA_PREP_INTERRUPT | DMA_COMPL_SKIP_SRC_UNMAP);
464 if (!ctl->adesc)
465 return NETDEV_TX_BUSY;
466
467 ctl->adesc->callback_param = netdev;
468 ctl->adesc->callback = ks8842_dma_tx_cb;
469 ctl->adesc->tx_submit(ctl->adesc);
470
471 netdev->stats.tx_bytes += skb->len;
472
473 dev_kfree_skb(skb);
474
475 return NETDEV_TX_OK;
476}
477
478static int ks8842_tx_frame(struct sk_buff *skb, struct net_device *netdev)
479{
480 struct ks8842_adapter *adapter = netdev_priv(netdev);
481 int len = skb->len;
482
483 netdev_dbg(netdev, "%s: len %u head %p data %p tail %p end %p\n",
484 __func__, skb->len, skb->head, skb->data,
485 skb_tail_pointer(skb), skb_end_pointer(skb));
486
487 /* check FIFO buffer space, we need space for CRC and command bits */
488 if (ks8842_tx_fifo_space(adapter) < len + 8)
489 return NETDEV_TX_BUSY;
490
491 if (adapter->conf_flags & KS884X_16BIT) {
492 u16 *ptr16 = (u16 *)skb->data;
493 ks8842_write16(adapter, 17, 0x8000 | 0x100, REG_QMU_DATA_LO);
494 ks8842_write16(adapter, 17, (u16)len, REG_QMU_DATA_HI);
495 netdev->stats.tx_bytes += len;
496
497 /* copy buffer */
498 while (len > 0) {
499 iowrite16(*ptr16++, adapter->hw_addr + REG_QMU_DATA_LO);
500 iowrite16(*ptr16++, adapter->hw_addr + REG_QMU_DATA_HI);
501 len -= sizeof(u32);
502 }
503 } else {
504
505 u32 *ptr = (u32 *)skb->data;
506 u32 ctrl;
507 /* the control word, enable IRQ, port 1 and the length */
508 ctrl = 0x8000 | 0x100 | (len << 16);
509 ks8842_write32(adapter, 17, ctrl, REG_QMU_DATA_LO);
510
511 netdev->stats.tx_bytes += len;
512
513 /* copy buffer */
514 while (len > 0) {
515 iowrite32(*ptr, adapter->hw_addr + REG_QMU_DATA_LO);
516 len -= sizeof(u32);
517 ptr++;
518 }
519 }
520
521 /* enqueue packet */
522 ks8842_write16(adapter, 17, 1, REG_TXQCR);
523
524 dev_kfree_skb(skb);
525
526 return NETDEV_TX_OK;
527}
528
529static void ks8842_update_rx_err_counters(struct net_device *netdev, u32 status)
530{
531 netdev_dbg(netdev, "RX error, status: %x\n", status);
532
533 netdev->stats.rx_errors++;
534 if (status & RXSR_TOO_LONG)
535 netdev->stats.rx_length_errors++;
536 if (status & RXSR_CRC_ERROR)
537 netdev->stats.rx_crc_errors++;
538 if (status & RXSR_RUNT)
539 netdev->stats.rx_frame_errors++;
540}
541
542static void ks8842_update_rx_counters(struct net_device *netdev, u32 status,
543 int len)
544{
545 netdev_dbg(netdev, "RX packet, len: %d\n", len);
546
547 netdev->stats.rx_packets++;
548 netdev->stats.rx_bytes += len;
549 if (status & RXSR_MULTICAST)
550 netdev->stats.multicast++;
551}
552
553static int __ks8842_start_new_rx_dma(struct net_device *netdev)
554{
555 struct ks8842_adapter *adapter = netdev_priv(netdev);
556 struct ks8842_rx_dma_ctl *ctl = &adapter->dma_rx;
557 struct scatterlist *sg = &ctl->sg;
558 int err;
559
560 ctl->skb = netdev_alloc_skb(netdev, DMA_BUFFER_SIZE);
561 if (ctl->skb) {
562 sg_init_table(sg, 1);
563 sg_dma_address(sg) = dma_map_single(adapter->dev,
564 ctl->skb->data, DMA_BUFFER_SIZE, DMA_FROM_DEVICE);
565 err = dma_mapping_error(adapter->dev, sg_dma_address(sg));
566 if (unlikely(err)) {
567 sg_dma_address(sg) = 0;
568 goto out;
569 }
570
571 sg_dma_len(sg) = DMA_BUFFER_SIZE;
572
573 ctl->adesc = ctl->chan->device->device_prep_slave_sg(ctl->chan,
574 sg, 1, DMA_FROM_DEVICE,
575 DMA_PREP_INTERRUPT | DMA_COMPL_SKIP_SRC_UNMAP);
576
577 if (!ctl->adesc)
578 goto out;
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 err;
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 = (u16 *)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 = (u32 *)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
708void ks8842_handle_rx(struct net_device *netdev, struct ks8842_adapter *adapter)
709{
710 u16 rx_data = ks8842_read16(adapter, 16, REG_RXMIR) & 0x1fff;
711 netdev_dbg(netdev, "%s Entry - rx_data: %d\n", __func__, rx_data);
712 while (rx_data) {
713 ks8842_rx_frame(netdev, adapter);
714 rx_data = ks8842_read16(adapter, 16, REG_RXMIR) & 0x1fff;
715 }
716}
717
718void ks8842_handle_tx(struct net_device *netdev, struct ks8842_adapter *adapter)
719{
720 u16 sr = ks8842_read16(adapter, 16, REG_TXSR);
721 netdev_dbg(netdev, "%s - entry, sr: %x\n", __func__, sr);
722 netdev->stats.tx_packets++;
723 if (netif_queue_stopped(netdev))
724 netif_wake_queue(netdev);
725}
726
727void ks8842_handle_rx_overrun(struct net_device *netdev,
728 struct ks8842_adapter *adapter)
729{
730 netdev_dbg(netdev, "%s: entry\n", __func__);
731 netdev->stats.rx_errors++;
732 netdev->stats.rx_fifo_errors++;
733}
734
735void ks8842_tasklet(unsigned long arg)
736{
737 struct net_device *netdev = (struct net_device *)arg;
738 struct ks8842_adapter *adapter = netdev_priv(netdev);
739 u16 isr;
740 unsigned long flags;
741 u16 entry_bank;
742
743 /* read current bank to be able to set it back */
744 spin_lock_irqsave(&adapter->lock, flags);
745 entry_bank = ioread16(adapter->hw_addr + REG_SELECT_BANK);
746 spin_unlock_irqrestore(&adapter->lock, flags);
747
748 isr = ks8842_read16(adapter, 18, REG_ISR);
749 netdev_dbg(netdev, "%s - ISR: 0x%x\n", __func__, isr);
750
751 /* when running in DMA mode, do not ack RX interrupts, it is handled
752 internally by timberdale, otherwise it's DMA FIFO:s would stop
753 */
754 if (KS8842_USE_DMA(adapter))
755 isr &= ~IRQ_RX;
756
757 /* Ack */
758 ks8842_write16(adapter, 18, isr, REG_ISR);
759
760 if (!(adapter->conf_flags & MICREL_KS884X))
761 /* Ack in the timberdale IP as well */
762 iowrite32(0x1, adapter->hw_addr + REG_TIMB_IAR);
763
764 if (!netif_running(netdev))
765 return;
766
767 if (isr & IRQ_LINK_CHANGE)
768 ks8842_update_link_status(netdev, adapter);
769
770 /* should not get IRQ_RX when running DMA mode */
771 if (isr & (IRQ_RX | IRQ_RX_ERROR) && !KS8842_USE_DMA(adapter))
772 ks8842_handle_rx(netdev, adapter);
773
774 /* should only happen when in PIO mode */
775 if (isr & IRQ_TX)
776 ks8842_handle_tx(netdev, adapter);
777
778 if (isr & IRQ_RX_OVERRUN)
779 ks8842_handle_rx_overrun(netdev, adapter);
780
781 if (isr & IRQ_TX_STOPPED) {
782 ks8842_disable_tx(adapter);
783 ks8842_enable_tx(adapter);
784 }
785
786 if (isr & IRQ_RX_STOPPED) {
787 ks8842_disable_rx(adapter);
788 ks8842_enable_rx(adapter);
789 }
790
791 /* re-enable interrupts, put back the bank selection register */
792 spin_lock_irqsave(&adapter->lock, flags);
793 if (KS8842_USE_DMA(adapter))
794 ks8842_write16(adapter, 18, ENABLED_IRQS_DMA, REG_IER);
795 else
796 ks8842_write16(adapter, 18, ENABLED_IRQS, REG_IER);
797 iowrite16(entry_bank, adapter->hw_addr + REG_SELECT_BANK);
798
799 /* Make sure timberdale continues DMA operations, they are stopped while
800 we are handling the ks8842 because we might change bank */
801 if (KS8842_USE_DMA(adapter))
802 ks8842_resume_dma(adapter);
803
804 spin_unlock_irqrestore(&adapter->lock, flags);
805}
806
807static irqreturn_t ks8842_irq(int irq, void *devid)
808{
809 struct net_device *netdev = devid;
810 struct ks8842_adapter *adapter = netdev_priv(netdev);
811 u16 isr;
812 u16 entry_bank = ioread16(adapter->hw_addr + REG_SELECT_BANK);
813 irqreturn_t ret = IRQ_NONE;
814
815 isr = ks8842_read16(adapter, 18, REG_ISR);
816 netdev_dbg(netdev, "%s - ISR: 0x%x\n", __func__, isr);
817
818 if (isr) {
819 if (KS8842_USE_DMA(adapter))
820 /* disable all but RX IRQ, since the FPGA relies on it*/
821 ks8842_write16(adapter, 18, IRQ_RX, REG_IER);
822 else
823 /* disable IRQ */
824 ks8842_write16(adapter, 18, 0x00, REG_IER);
825
826 /* schedule tasklet */
827 tasklet_schedule(&adapter->tasklet);
828
829 ret = IRQ_HANDLED;
830 }
831
832 iowrite16(entry_bank, adapter->hw_addr + REG_SELECT_BANK);
833
834 /* After an interrupt, tell timberdale to continue DMA operations.
835 DMA is disabled while we are handling the ks8842 because we might
836 change bank */
837 ks8842_resume_dma(adapter);
838
839 return ret;
840}
841
842static void ks8842_dma_rx_cb(void *data)
843{
844 struct net_device *netdev = data;
845 struct ks8842_adapter *adapter = netdev_priv(netdev);
846
847 netdev_dbg(netdev, "RX DMA finished\n");
848 /* schedule tasklet */
849 if (adapter->dma_rx.adesc)
850 tasklet_schedule(&adapter->dma_rx.tasklet);
851}
852
853static void ks8842_dma_tx_cb(void *data)
854{
855 struct net_device *netdev = data;
856 struct ks8842_adapter *adapter = netdev_priv(netdev);
857 struct ks8842_tx_dma_ctl *ctl = &adapter->dma_tx;
858
859 netdev_dbg(netdev, "TX DMA finished\n");
860
861 if (!ctl->adesc)
862 return;
863
864 netdev->stats.tx_packets++;
865 ctl->adesc = NULL;
866
867 if (netif_queue_stopped(netdev))
868 netif_wake_queue(netdev);
869}
870
871static void ks8842_stop_dma(struct ks8842_adapter *adapter)
872{
873 struct ks8842_tx_dma_ctl *tx_ctl = &adapter->dma_tx;
874 struct ks8842_rx_dma_ctl *rx_ctl = &adapter->dma_rx;
875
876 tx_ctl->adesc = NULL;
877 if (tx_ctl->chan)
878 tx_ctl->chan->device->device_control(tx_ctl->chan,
879 DMA_TERMINATE_ALL, 0);
880
881 rx_ctl->adesc = NULL;
882 if (rx_ctl->chan)
883 rx_ctl->chan->device->device_control(rx_ctl->chan,
884 DMA_TERMINATE_ALL, 0);
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 err = dma_mapping_error(adapter->dev,
958 sg_dma_address(&tx_ctl->sg));
959 if (err) {
960 sg_dma_address(&tx_ctl->sg) = 0;
961 goto err;
962 }
963
964 rx_ctl->chan = dma_request_channel(mask, ks8842_dma_filter_fn,
965 (void *)(long)rx_ctl->channel);
966 if (!rx_ctl->chan) {
967 err = -ENODEV;
968 goto err;
969 }
970
971 tasklet_init(&rx_ctl->tasklet, ks8842_rx_frame_dma_tasklet,
972 (unsigned long)netdev);
973
974 return 0;
975err:
976 ks8842_dealloc_dma_bufs(adapter);
977 return err;
978}
979
980/* Netdevice operations */
981
982static int ks8842_open(struct net_device *netdev)
983{
984 struct ks8842_adapter *adapter = netdev_priv(netdev);
985 int err;
986
987 netdev_dbg(netdev, "%s - entry\n", __func__);
988
989 if (KS8842_USE_DMA(adapter)) {
990 err = ks8842_alloc_dma_bufs(netdev);
991
992 if (!err) {
993 /* start RX dma */
994 err = __ks8842_start_new_rx_dma(netdev);
995 if (err)
996 ks8842_dealloc_dma_bufs(adapter);
997 }
998
999 if (err) {
1000 printk(KERN_WARNING DRV_NAME
1001 ": Failed to initiate DMA, running PIO\n");
1002 ks8842_dealloc_dma_bufs(adapter);
1003 adapter->dma_rx.channel = -1;
1004 adapter->dma_tx.channel = -1;
1005 }
1006 }
1007
1008 /* reset the HW */
1009 ks8842_reset_hw(adapter);
1010
1011 ks8842_write_mac_addr(adapter, netdev->dev_addr);
1012
1013 ks8842_update_link_status(netdev, adapter);
1014
1015 err = request_irq(adapter->irq, ks8842_irq, IRQF_SHARED, DRV_NAME,
1016 netdev);
1017 if (err) {
1018 pr_err("Failed to request IRQ: %d: %d\n", adapter->irq, err);
1019 return err;
1020 }
1021
1022 return 0;
1023}
1024
1025static int ks8842_close(struct net_device *netdev)
1026{
1027 struct ks8842_adapter *adapter = netdev_priv(netdev);
1028
1029 netdev_dbg(netdev, "%s - entry\n", __func__);
1030
1031 cancel_work_sync(&adapter->timeout_work);
1032
1033 if (KS8842_USE_DMA(adapter))
1034 ks8842_dealloc_dma_bufs(adapter);
1035
1036 /* free the irq */
1037 free_irq(adapter->irq, netdev);
1038
1039 /* disable the switch */
1040 ks8842_write16(adapter, 32, 0x0, REG_SW_ID_AND_ENABLE);
1041
1042 return 0;
1043}
1044
1045static netdev_tx_t ks8842_xmit_frame(struct sk_buff *skb,
1046 struct net_device *netdev)
1047{
1048 int ret;
1049 struct ks8842_adapter *adapter = netdev_priv(netdev);
1050
1051 netdev_dbg(netdev, "%s: entry\n", __func__);
1052
1053 if (KS8842_USE_DMA(adapter)) {
1054 unsigned long flags;
1055 ret = ks8842_tx_frame_dma(skb, netdev);
1056 /* for now only allow one transfer at the time */
1057 spin_lock_irqsave(&adapter->lock, flags);
1058 if (adapter->dma_tx.adesc)
1059 netif_stop_queue(netdev);
1060 spin_unlock_irqrestore(&adapter->lock, flags);
1061 return ret;
1062 }
1063
1064 ret = ks8842_tx_frame(skb, netdev);
1065
1066 if (ks8842_tx_fifo_space(adapter) < netdev->mtu + 8)
1067 netif_stop_queue(netdev);
1068
1069 return ret;
1070}
1071
1072static int ks8842_set_mac(struct net_device *netdev, void *p)
1073{
1074 struct ks8842_adapter *adapter = netdev_priv(netdev);
1075 struct sockaddr *addr = p;
1076 char *mac = (u8 *)addr->sa_data;
1077
1078 netdev_dbg(netdev, "%s: entry\n", __func__);
1079
1080 if (!is_valid_ether_addr(addr->sa_data))
1081 return -EADDRNOTAVAIL;
1082
1083 memcpy(netdev->dev_addr, mac, netdev->addr_len);
1084
1085 ks8842_write_mac_addr(adapter, mac);
1086 return 0;
1087}
1088
1089static void ks8842_tx_timeout_work(struct work_struct *work)
1090{
1091 struct ks8842_adapter *adapter =
1092 container_of(work, struct ks8842_adapter, timeout_work);
1093 struct net_device *netdev = adapter->netdev;
1094 unsigned long flags;
1095
1096 netdev_dbg(netdev, "%s: entry\n", __func__);
1097
1098 spin_lock_irqsave(&adapter->lock, flags);
1099
1100 if (KS8842_USE_DMA(adapter))
1101 ks8842_stop_dma(adapter);
1102
1103 /* disable interrupts */
1104 ks8842_write16(adapter, 18, 0, REG_IER);
1105 ks8842_write16(adapter, 18, 0xFFFF, REG_ISR);
1106
1107 netif_stop_queue(netdev);
1108
1109 spin_unlock_irqrestore(&adapter->lock, flags);
1110
1111 ks8842_reset_hw(adapter);
1112
1113 ks8842_write_mac_addr(adapter, netdev->dev_addr);
1114
1115 ks8842_update_link_status(netdev, adapter);
1116
1117 if (KS8842_USE_DMA(adapter))
1118 __ks8842_start_new_rx_dma(netdev);
1119}
1120
1121static void ks8842_tx_timeout(struct net_device *netdev)
1122{
1123 struct ks8842_adapter *adapter = netdev_priv(netdev);
1124
1125 netdev_dbg(netdev, "%s: entry\n", __func__);
1126
1127 schedule_work(&adapter->timeout_work);
1128}
1129
1130static const struct net_device_ops ks8842_netdev_ops = {
1131 .ndo_open = ks8842_open,
1132 .ndo_stop = ks8842_close,
1133 .ndo_start_xmit = ks8842_xmit_frame,
1134 .ndo_set_mac_address = ks8842_set_mac,
1135 .ndo_tx_timeout = ks8842_tx_timeout,
1136 .ndo_validate_addr = eth_validate_addr
1137};
1138
1139static const struct ethtool_ops ks8842_ethtool_ops = {
1140 .get_link = ethtool_op_get_link,
1141};
1142
1143static int __devinit ks8842_probe(struct platform_device *pdev)
1144{
1145 int err = -ENOMEM;
1146 struct resource *iomem;
1147 struct net_device *netdev;
1148 struct ks8842_adapter *adapter;
1149 struct ks8842_platform_data *pdata = pdev->dev.platform_data;
1150 u16 id;
1151 unsigned i;
1152
1153 iomem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1154 if (!request_mem_region(iomem->start, resource_size(iomem), DRV_NAME))
1155 goto err_mem_region;
1156
1157 netdev = alloc_etherdev(sizeof(struct ks8842_adapter));
1158 if (!netdev)
1159 goto err_alloc_etherdev;
1160
1161 SET_NETDEV_DEV(netdev, &pdev->dev);
1162
1163 adapter = netdev_priv(netdev);
1164 adapter->netdev = netdev;
1165 INIT_WORK(&adapter->timeout_work, ks8842_tx_timeout_work);
1166 adapter->hw_addr = ioremap(iomem->start, resource_size(iomem));
1167 adapter->conf_flags = iomem->flags;
1168
1169 if (!adapter->hw_addr)
1170 goto err_ioremap;
1171
1172 adapter->irq = platform_get_irq(pdev, 0);
1173 if (adapter->irq < 0) {
1174 err = adapter->irq;
1175 goto err_get_irq;
1176 }
1177
1178 adapter->dev = (pdev->dev.parent) ? pdev->dev.parent : &pdev->dev;
1179
1180 /* DMA is only supported when accessed via timberdale */
1181 if (!(adapter->conf_flags & MICREL_KS884X) && pdata &&
1182 (pdata->tx_dma_channel != -1) &&
1183 (pdata->rx_dma_channel != -1)) {
1184 adapter->dma_rx.channel = pdata->rx_dma_channel;
1185 adapter->dma_tx.channel = pdata->tx_dma_channel;
1186 } else {
1187 adapter->dma_rx.channel = -1;
1188 adapter->dma_tx.channel = -1;
1189 }
1190
1191 tasklet_init(&adapter->tasklet, ks8842_tasklet, (unsigned long)netdev);
1192 spin_lock_init(&adapter->lock);
1193
1194 netdev->netdev_ops = &ks8842_netdev_ops;
1195 netdev->ethtool_ops = &ks8842_ethtool_ops;
1196
1197 /* Check if a mac address was given */
1198 i = netdev->addr_len;
1199 if (pdata) {
1200 for (i = 0; i < netdev->addr_len; i++)
1201 if (pdata->macaddr[i] != 0)
1202 break;
1203
1204 if (i < netdev->addr_len)
1205 /* an address was passed, use it */
1206 memcpy(netdev->dev_addr, pdata->macaddr,
1207 netdev->addr_len);
1208 }
1209
1210 if (i == netdev->addr_len) {
1211 ks8842_read_mac_addr(adapter, netdev->dev_addr);
1212
1213 if (!is_valid_ether_addr(netdev->dev_addr))
1214 random_ether_addr(netdev->dev_addr);
1215 }
1216
1217 id = ks8842_read16(adapter, 32, REG_SW_ID_AND_ENABLE);
1218
1219 strcpy(netdev->name, "eth%d");
1220 err = register_netdev(netdev);
1221 if (err)
1222 goto err_register;
1223
1224 platform_set_drvdata(pdev, netdev);
1225
1226 pr_info("Found chip, family: 0x%x, id: 0x%x, rev: 0x%x\n",
1227 (id >> 8) & 0xff, (id >> 4) & 0xf, (id >> 1) & 0x7);
1228
1229 return 0;
1230
1231err_register:
1232err_get_irq:
1233 iounmap(adapter->hw_addr);
1234err_ioremap:
1235 free_netdev(netdev);
1236err_alloc_etherdev:
1237 release_mem_region(iomem->start, resource_size(iomem));
1238err_mem_region:
1239 return err;
1240}
1241
1242static int __devexit ks8842_remove(struct platform_device *pdev)
1243{
1244 struct net_device *netdev = platform_get_drvdata(pdev);
1245 struct ks8842_adapter *adapter = netdev_priv(netdev);
1246 struct resource *iomem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1247
1248 unregister_netdev(netdev);
1249 tasklet_kill(&adapter->tasklet);
1250 iounmap(adapter->hw_addr);
1251 free_netdev(netdev);
1252 release_mem_region(iomem->start, resource_size(iomem));
1253 platform_set_drvdata(pdev, NULL);
1254 return 0;
1255}
1256
1257
1258static struct platform_driver ks8842_platform_driver = {
1259 .driver = {
1260 .name = DRV_NAME,
1261 .owner = THIS_MODULE,
1262 },
1263 .probe = ks8842_probe,
1264 .remove = ks8842_remove,
1265};
1266
1267static int __init ks8842_init(void)
1268{
1269 return platform_driver_register(&ks8842_platform_driver);
1270}
1271
1272static void __exit ks8842_exit(void)
1273{
1274 platform_driver_unregister(&ks8842_platform_driver);
1275}
1276
1277module_init(ks8842_init);
1278module_exit(ks8842_exit);
1279
1280MODULE_DESCRIPTION("Timberdale KS8842 ethernet driver");
1281MODULE_AUTHOR("Mocean Laboratories <info@mocean-labs.com>");
1282MODULE_LICENSE("GPL v2");
1283MODULE_ALIAS("platform:ks8842");
1284