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1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * ks8842.c timberdale KS8842 ethernet driver
4 * Copyright (c) 2009 Intel Corporation
5 */
6
7/* Supports:
8 * The Micrel KS8842 behind the timberdale FPGA
9 * The genuine Micrel KS8841/42 device with ISA 16/32bit bus interface
10 */
11
12#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
13
14#include <linux/interrupt.h>
15#include <linux/kernel.h>
16#include <linux/module.h>
17#include <linux/platform_device.h>
18#include <linux/netdevice.h>
19#include <linux/etherdevice.h>
20#include <linux/ethtool.h>
21#include <linux/ks8842.h>
22#include <linux/dmaengine.h>
23#include <linux/dma-mapping.h>
24#include <linux/scatterlist.h>
25
26#define DRV_NAME "ks8842"
27
28/* Timberdale specific Registers */
29#define REG_TIMB_RST 0x1c
30#define REG_TIMB_FIFO 0x20
31#define REG_TIMB_ISR 0x24
32#define REG_TIMB_IER 0x28
33#define REG_TIMB_IAR 0x2C
34#define REQ_TIMB_DMA_RESUME 0x30
35
36/* KS8842 registers */
37
38#define REG_SELECT_BANK 0x0e
39
40/* bank 0 registers */
41#define REG_QRFCR 0x04
42
43/* bank 2 registers */
44#define REG_MARL 0x00
45#define REG_MARM 0x02
46#define REG_MARH 0x04
47
48/* bank 3 registers */
49#define REG_GRR 0x06
50
51/* bank 16 registers */
52#define REG_TXCR 0x00
53#define REG_TXSR 0x02
54#define REG_RXCR 0x04
55#define REG_TXMIR 0x08
56#define REG_RXMIR 0x0A
57
58/* bank 17 registers */
59#define REG_TXQCR 0x00
60#define REG_RXQCR 0x02
61#define REG_TXFDPR 0x04
62#define REG_RXFDPR 0x06
63#define REG_QMU_DATA_LO 0x08
64#define REG_QMU_DATA_HI 0x0A
65
66/* bank 18 registers */
67#define REG_IER 0x00
68#define IRQ_LINK_CHANGE 0x8000
69#define IRQ_TX 0x4000
70#define IRQ_RX 0x2000
71#define IRQ_RX_OVERRUN 0x0800
72#define IRQ_TX_STOPPED 0x0200
73#define IRQ_RX_STOPPED 0x0100
74#define IRQ_RX_ERROR 0x0080
75#define ENABLED_IRQS (IRQ_LINK_CHANGE | IRQ_TX | IRQ_RX | IRQ_RX_STOPPED | \
76 IRQ_TX_STOPPED | IRQ_RX_OVERRUN | IRQ_RX_ERROR)
77/* When running via timberdale in DMA mode, the RX interrupt should be
78 enabled in the KS8842, but not in the FPGA IP, since the IP handles
79 RX DMA internally.
80 TX interrupts are not needed it is handled by the FPGA the driver is
81 notified via DMA callbacks.
82*/
83#define ENABLED_IRQS_DMA_IP (IRQ_LINK_CHANGE | IRQ_RX_STOPPED | \
84 IRQ_TX_STOPPED | IRQ_RX_OVERRUN | IRQ_RX_ERROR)
85#define ENABLED_IRQS_DMA (ENABLED_IRQS_DMA_IP | IRQ_RX)
86#define REG_ISR 0x02
87#define REG_RXSR 0x04
88#define RXSR_VALID 0x8000
89#define RXSR_BROADCAST 0x80
90#define RXSR_MULTICAST 0x40
91#define RXSR_UNICAST 0x20
92#define RXSR_FRAMETYPE 0x08
93#define RXSR_TOO_LONG 0x04
94#define RXSR_RUNT 0x02
95#define RXSR_CRC_ERROR 0x01
96#define RXSR_ERROR (RXSR_TOO_LONG | RXSR_RUNT | RXSR_CRC_ERROR)
97
98/* bank 32 registers */
99#define REG_SW_ID_AND_ENABLE 0x00
100#define REG_SGCR1 0x02
101#define REG_SGCR2 0x04
102#define REG_SGCR3 0x06
103
104/* bank 39 registers */
105#define REG_MACAR1 0x00
106#define REG_MACAR2 0x02
107#define REG_MACAR3 0x04
108
109/* bank 45 registers */
110#define REG_P1MBCR 0x00
111#define REG_P1MBSR 0x02
112
113/* bank 46 registers */
114#define REG_P2MBCR 0x00
115#define REG_P2MBSR 0x02
116
117/* bank 48 registers */
118#define REG_P1CR2 0x02
119
120/* bank 49 registers */
121#define REG_P1CR4 0x02
122#define REG_P1SR 0x04
123
124/* flags passed by platform_device for configuration */
125#define MICREL_KS884X 0x01 /* 0=Timeberdale(FPGA), 1=Micrel */
126#define KS884X_16BIT 0x02 /* 1=16bit, 0=32bit */
127
128#define DMA_BUFFER_SIZE 2048
129
130struct ks8842_tx_dma_ctl {
131 struct dma_chan *chan;
132 struct dma_async_tx_descriptor *adesc;
133 void *buf;
134 struct scatterlist sg;
135 int channel;
136};
137
138struct ks8842_rx_dma_ctl {
139 struct dma_chan *chan;
140 struct dma_async_tx_descriptor *adesc;
141 struct sk_buff *skb;
142 struct scatterlist sg;
143 struct tasklet_struct tasklet;
144 int channel;
145};
146
147#define KS8842_USE_DMA(adapter) (((adapter)->dma_tx.channel != -1) && \
148 ((adapter)->dma_rx.channel != -1))
149
150struct ks8842_adapter {
151 void __iomem *hw_addr;
152 int irq;
153 unsigned long conf_flags; /* copy of platform_device config */
154 struct tasklet_struct tasklet;
155 spinlock_t lock; /* spinlock to be interrupt safe */
156 struct work_struct timeout_work;
157 struct net_device *netdev;
158 struct device *dev;
159 struct ks8842_tx_dma_ctl dma_tx;
160 struct ks8842_rx_dma_ctl dma_rx;
161};
162
163static void ks8842_dma_rx_cb(void *data);
164static void ks8842_dma_tx_cb(void *data);
165
166static inline void ks8842_resume_dma(struct ks8842_adapter *adapter)
167{
168 iowrite32(1, adapter->hw_addr + REQ_TIMB_DMA_RESUME);
169}
170
171static inline void ks8842_select_bank(struct ks8842_adapter *adapter, u16 bank)
172{
173 iowrite16(bank, adapter->hw_addr + REG_SELECT_BANK);
174}
175
176static inline void ks8842_write8(struct ks8842_adapter *adapter, u16 bank,
177 u8 value, int offset)
178{
179 ks8842_select_bank(adapter, bank);
180 iowrite8(value, adapter->hw_addr + offset);
181}
182
183static inline void ks8842_write16(struct ks8842_adapter *adapter, u16 bank,
184 u16 value, int offset)
185{
186 ks8842_select_bank(adapter, bank);
187 iowrite16(value, adapter->hw_addr + offset);
188}
189
190static inline void ks8842_enable_bits(struct ks8842_adapter *adapter, u16 bank,
191 u16 bits, int offset)
192{
193 u16 reg;
194 ks8842_select_bank(adapter, bank);
195 reg = ioread16(adapter->hw_addr + offset);
196 reg |= bits;
197 iowrite16(reg, adapter->hw_addr + offset);
198}
199
200static inline void ks8842_clear_bits(struct ks8842_adapter *adapter, u16 bank,
201 u16 bits, int offset)
202{
203 u16 reg;
204 ks8842_select_bank(adapter, bank);
205 reg = ioread16(adapter->hw_addr + offset);
206 reg &= ~bits;
207 iowrite16(reg, adapter->hw_addr + offset);
208}
209
210static inline void ks8842_write32(struct ks8842_adapter *adapter, u16 bank,
211 u32 value, int offset)
212{
213 ks8842_select_bank(adapter, bank);
214 iowrite32(value, adapter->hw_addr + offset);
215}
216
217static inline u8 ks8842_read8(struct ks8842_adapter *adapter, u16 bank,
218 int offset)
219{
220 ks8842_select_bank(adapter, bank);
221 return ioread8(adapter->hw_addr + offset);
222}
223
224static inline u16 ks8842_read16(struct ks8842_adapter *adapter, u16 bank,
225 int offset)
226{
227 ks8842_select_bank(adapter, bank);
228 return ioread16(adapter->hw_addr + offset);
229}
230
231static inline u32 ks8842_read32(struct ks8842_adapter *adapter, u16 bank,
232 int offset)
233{
234 ks8842_select_bank(adapter, bank);
235 return ioread32(adapter->hw_addr + offset);
236}
237
238static void ks8842_reset(struct ks8842_adapter *adapter)
239{
240 if (adapter->conf_flags & MICREL_KS884X) {
241 ks8842_write16(adapter, 3, 1, REG_GRR);
242 msleep(10);
243 iowrite16(0, adapter->hw_addr + REG_GRR);
244 } else {
245 /* The KS8842 goes haywire when doing softare reset
246 * a work around in the timberdale IP is implemented to
247 * do a hardware reset instead
248 ks8842_write16(adapter, 3, 1, REG_GRR);
249 msleep(10);
250 iowrite16(0, adapter->hw_addr + REG_GRR);
251 */
252 iowrite32(0x1, adapter->hw_addr + REG_TIMB_RST);
253 msleep(20);
254 }
255}
256
257static void ks8842_update_link_status(struct net_device *netdev,
258 struct ks8842_adapter *adapter)
259{
260 /* check the status of the link */
261 if (ks8842_read16(adapter, 45, REG_P1MBSR) & 0x4) {
262 netif_carrier_on(netdev);
263 netif_wake_queue(netdev);
264 } else {
265 netif_stop_queue(netdev);
266 netif_carrier_off(netdev);
267 }
268}
269
270static void ks8842_enable_tx(struct ks8842_adapter *adapter)
271{
272 ks8842_enable_bits(adapter, 16, 0x01, REG_TXCR);
273}
274
275static void ks8842_disable_tx(struct ks8842_adapter *adapter)
276{
277 ks8842_clear_bits(adapter, 16, 0x01, REG_TXCR);
278}
279
280static void ks8842_enable_rx(struct ks8842_adapter *adapter)
281{
282 ks8842_enable_bits(adapter, 16, 0x01, REG_RXCR);
283}
284
285static void ks8842_disable_rx(struct ks8842_adapter *adapter)
286{
287 ks8842_clear_bits(adapter, 16, 0x01, REG_RXCR);
288}
289
290static void ks8842_reset_hw(struct ks8842_adapter *adapter)
291{
292 /* reset the HW */
293 ks8842_reset(adapter);
294
295 /* Enable QMU Transmit flow control / transmit padding / Transmit CRC */
296 ks8842_write16(adapter, 16, 0x000E, REG_TXCR);
297
298 /* enable the receiver, uni + multi + broadcast + flow ctrl
299 + crc strip */
300 ks8842_write16(adapter, 16, 0x8 | 0x20 | 0x40 | 0x80 | 0x400,
301 REG_RXCR);
302
303 /* TX frame pointer autoincrement */
304 ks8842_write16(adapter, 17, 0x4000, REG_TXFDPR);
305
306 /* RX frame pointer autoincrement */
307 ks8842_write16(adapter, 17, 0x4000, REG_RXFDPR);
308
309 /* RX 2 kb high watermark */
310 ks8842_write16(adapter, 0, 0x1000, REG_QRFCR);
311
312 /* aggressive back off in half duplex */
313 ks8842_enable_bits(adapter, 32, 1 << 8, REG_SGCR1);
314
315 /* enable no excessive collison drop */
316 ks8842_enable_bits(adapter, 32, 1 << 3, REG_SGCR2);
317
318 /* Enable port 1 force flow control / back pressure / transmit / recv */
319 ks8842_write16(adapter, 48, 0x1E07, REG_P1CR2);
320
321 /* restart port auto-negotiation */
322 ks8842_enable_bits(adapter, 49, 1 << 13, REG_P1CR4);
323
324 /* Enable the transmitter */
325 ks8842_enable_tx(adapter);
326
327 /* Enable the receiver */
328 ks8842_enable_rx(adapter);
329
330 /* clear all interrupts */
331 ks8842_write16(adapter, 18, 0xffff, REG_ISR);
332
333 /* enable interrupts */
334 if (KS8842_USE_DMA(adapter)) {
335 /* When running in DMA Mode the RX interrupt is not enabled in
336 timberdale because RX data is received by DMA callbacks
337 it must still be enabled in the KS8842 because it indicates
338 to timberdale when there is RX data for it's DMA FIFOs */
339 iowrite16(ENABLED_IRQS_DMA_IP, adapter->hw_addr + REG_TIMB_IER);
340 ks8842_write16(adapter, 18, ENABLED_IRQS_DMA, REG_IER);
341 } else {
342 if (!(adapter->conf_flags & MICREL_KS884X))
343 iowrite16(ENABLED_IRQS,
344 adapter->hw_addr + REG_TIMB_IER);
345 ks8842_write16(adapter, 18, ENABLED_IRQS, REG_IER);
346 }
347 /* enable the switch */
348 ks8842_write16(adapter, 32, 0x1, REG_SW_ID_AND_ENABLE);
349}
350
351static void ks8842_init_mac_addr(struct ks8842_adapter *adapter)
352{
353 u8 addr[ETH_ALEN];
354 int i;
355 u16 mac;
356
357 for (i = 0; i < ETH_ALEN; i++)
358 addr[ETH_ALEN - i - 1] = ks8842_read8(adapter, 2, REG_MARL + i);
359 eth_hw_addr_set(adapter->netdev, addr);
360
361 if (adapter->conf_flags & MICREL_KS884X) {
362 /*
363 the sequence of saving mac addr between MAC and Switch is
364 different.
365 */
366
367 mac = ks8842_read16(adapter, 2, REG_MARL);
368 ks8842_write16(adapter, 39, mac, REG_MACAR3);
369 mac = ks8842_read16(adapter, 2, REG_MARM);
370 ks8842_write16(adapter, 39, mac, REG_MACAR2);
371 mac = ks8842_read16(adapter, 2, REG_MARH);
372 ks8842_write16(adapter, 39, mac, REG_MACAR1);
373 } else {
374
375 /* make sure the switch port uses the same MAC as the QMU */
376 mac = ks8842_read16(adapter, 2, REG_MARL);
377 ks8842_write16(adapter, 39, mac, REG_MACAR1);
378 mac = ks8842_read16(adapter, 2, REG_MARM);
379 ks8842_write16(adapter, 39, mac, REG_MACAR2);
380 mac = ks8842_read16(adapter, 2, REG_MARH);
381 ks8842_write16(adapter, 39, mac, REG_MACAR3);
382 }
383}
384
385static void ks8842_write_mac_addr(struct ks8842_adapter *adapter, const u8 *mac)
386{
387 unsigned long flags;
388 unsigned i;
389
390 spin_lock_irqsave(&adapter->lock, flags);
391 for (i = 0; i < ETH_ALEN; i++) {
392 ks8842_write8(adapter, 2, mac[ETH_ALEN - i - 1], REG_MARL + i);
393 if (!(adapter->conf_flags & MICREL_KS884X))
394 ks8842_write8(adapter, 39, mac[ETH_ALEN - i - 1],
395 REG_MACAR1 + i);
396 }
397
398 if (adapter->conf_flags & MICREL_KS884X) {
399 /*
400 the sequence of saving mac addr between MAC and Switch is
401 different.
402 */
403
404 u16 mac;
405
406 mac = ks8842_read16(adapter, 2, REG_MARL);
407 ks8842_write16(adapter, 39, mac, REG_MACAR3);
408 mac = ks8842_read16(adapter, 2, REG_MARM);
409 ks8842_write16(adapter, 39, mac, REG_MACAR2);
410 mac = ks8842_read16(adapter, 2, REG_MARH);
411 ks8842_write16(adapter, 39, mac, REG_MACAR1);
412 }
413 spin_unlock_irqrestore(&adapter->lock, flags);
414}
415
416static inline u16 ks8842_tx_fifo_space(struct ks8842_adapter *adapter)
417{
418 return ks8842_read16(adapter, 16, REG_TXMIR) & 0x1fff;
419}
420
421static int ks8842_tx_frame_dma(struct sk_buff *skb, struct net_device *netdev)
422{
423 struct ks8842_adapter *adapter = netdev_priv(netdev);
424 struct ks8842_tx_dma_ctl *ctl = &adapter->dma_tx;
425 u8 *buf = ctl->buf;
426
427 if (ctl->adesc) {
428 netdev_dbg(netdev, "%s: TX ongoing\n", __func__);
429 /* transfer ongoing */
430 return NETDEV_TX_BUSY;
431 }
432
433 sg_dma_len(&ctl->sg) = skb->len + sizeof(u32);
434
435 /* copy data to the TX buffer */
436 /* the control word, enable IRQ, port 1 and the length */
437 *buf++ = 0x00;
438 *buf++ = 0x01; /* Port 1 */
439 *buf++ = skb->len & 0xff;
440 *buf++ = (skb->len >> 8) & 0xff;
441 skb_copy_from_linear_data(skb, buf, skb->len);
442
443 dma_sync_single_range_for_device(adapter->dev,
444 sg_dma_address(&ctl->sg), 0, sg_dma_len(&ctl->sg),
445 DMA_TO_DEVICE);
446
447 /* make sure the length is a multiple of 4 */
448 if (sg_dma_len(&ctl->sg) % 4)
449 sg_dma_len(&ctl->sg) += 4 - sg_dma_len(&ctl->sg) % 4;
450
451 ctl->adesc = dmaengine_prep_slave_sg(ctl->chan,
452 &ctl->sg, 1, DMA_MEM_TO_DEV, DMA_PREP_INTERRUPT);
453 if (!ctl->adesc)
454 return NETDEV_TX_BUSY;
455
456 ctl->adesc->callback_param = netdev;
457 ctl->adesc->callback = ks8842_dma_tx_cb;
458 ctl->adesc->tx_submit(ctl->adesc);
459
460 netdev->stats.tx_bytes += skb->len;
461
462 dev_kfree_skb(skb);
463
464 return NETDEV_TX_OK;
465}
466
467static int ks8842_tx_frame(struct sk_buff *skb, struct net_device *netdev)
468{
469 struct ks8842_adapter *adapter = netdev_priv(netdev);
470 int len = skb->len;
471
472 netdev_dbg(netdev, "%s: len %u head %p data %p tail %p end %p\n",
473 __func__, skb->len, skb->head, skb->data,
474 skb_tail_pointer(skb), skb_end_pointer(skb));
475
476 /* check FIFO buffer space, we need space for CRC and command bits */
477 if (ks8842_tx_fifo_space(adapter) < len + 8)
478 return NETDEV_TX_BUSY;
479
480 if (adapter->conf_flags & KS884X_16BIT) {
481 u16 *ptr16 = (u16 *)skb->data;
482 ks8842_write16(adapter, 17, 0x8000 | 0x100, REG_QMU_DATA_LO);
483 ks8842_write16(adapter, 17, (u16)len, REG_QMU_DATA_HI);
484 netdev->stats.tx_bytes += len;
485
486 /* copy buffer */
487 while (len > 0) {
488 iowrite16(*ptr16++, adapter->hw_addr + REG_QMU_DATA_LO);
489 iowrite16(*ptr16++, adapter->hw_addr + REG_QMU_DATA_HI);
490 len -= sizeof(u32);
491 }
492 } else {
493
494 u32 *ptr = (u32 *)skb->data;
495 u32 ctrl;
496 /* the control word, enable IRQ, port 1 and the length */
497 ctrl = 0x8000 | 0x100 | (len << 16);
498 ks8842_write32(adapter, 17, ctrl, REG_QMU_DATA_LO);
499
500 netdev->stats.tx_bytes += len;
501
502 /* copy buffer */
503 while (len > 0) {
504 iowrite32(*ptr, adapter->hw_addr + REG_QMU_DATA_LO);
505 len -= sizeof(u32);
506 ptr++;
507 }
508 }
509
510 /* enqueue packet */
511 ks8842_write16(adapter, 17, 1, REG_TXQCR);
512
513 dev_kfree_skb(skb);
514
515 return NETDEV_TX_OK;
516}
517
518static void ks8842_update_rx_err_counters(struct net_device *netdev, u32 status)
519{
520 netdev_dbg(netdev, "RX error, status: %x\n", status);
521
522 netdev->stats.rx_errors++;
523 if (status & RXSR_TOO_LONG)
524 netdev->stats.rx_length_errors++;
525 if (status & RXSR_CRC_ERROR)
526 netdev->stats.rx_crc_errors++;
527 if (status & RXSR_RUNT)
528 netdev->stats.rx_frame_errors++;
529}
530
531static void ks8842_update_rx_counters(struct net_device *netdev, u32 status,
532 int len)
533{
534 netdev_dbg(netdev, "RX packet, len: %d\n", len);
535
536 netdev->stats.rx_packets++;
537 netdev->stats.rx_bytes += len;
538 if (status & RXSR_MULTICAST)
539 netdev->stats.multicast++;
540}
541
542static int __ks8842_start_new_rx_dma(struct net_device *netdev)
543{
544 struct ks8842_adapter *adapter = netdev_priv(netdev);
545 struct ks8842_rx_dma_ctl *ctl = &adapter->dma_rx;
546 struct scatterlist *sg = &ctl->sg;
547 int err;
548
549 ctl->skb = netdev_alloc_skb(netdev, DMA_BUFFER_SIZE);
550 if (ctl->skb) {
551 sg_init_table(sg, 1);
552 sg_dma_address(sg) = dma_map_single(adapter->dev,
553 ctl->skb->data, DMA_BUFFER_SIZE, DMA_FROM_DEVICE);
554 if (dma_mapping_error(adapter->dev, sg_dma_address(sg))) {
555 err = -ENOMEM;
556 sg_dma_address(sg) = 0;
557 goto out;
558 }
559
560 sg_dma_len(sg) = DMA_BUFFER_SIZE;
561
562 ctl->adesc = dmaengine_prep_slave_sg(ctl->chan,
563 sg, 1, DMA_DEV_TO_MEM, DMA_PREP_INTERRUPT);
564
565 if (!ctl->adesc) {
566 err = -ENOMEM;
567 goto out;
568 }
569
570 ctl->adesc->callback_param = netdev;
571 ctl->adesc->callback = ks8842_dma_rx_cb;
572 ctl->adesc->tx_submit(ctl->adesc);
573 } else {
574 err = -ENOMEM;
575 sg_dma_address(sg) = 0;
576 goto out;
577 }
578
579 return 0;
580out:
581 if (sg_dma_address(sg))
582 dma_unmap_single(adapter->dev, sg_dma_address(sg),
583 DMA_BUFFER_SIZE, DMA_FROM_DEVICE);
584 sg_dma_address(sg) = 0;
585 dev_kfree_skb(ctl->skb);
586 ctl->skb = NULL;
587
588 printk(KERN_ERR DRV_NAME": Failed to start RX DMA: %d\n", err);
589 return err;
590}
591
592static void ks8842_rx_frame_dma_tasklet(struct tasklet_struct *t)
593{
594 struct ks8842_adapter *adapter = from_tasklet(adapter, t, dma_rx.tasklet);
595 struct net_device *netdev = adapter->netdev;
596 struct ks8842_rx_dma_ctl *ctl = &adapter->dma_rx;
597 struct sk_buff *skb = ctl->skb;
598 dma_addr_t addr = sg_dma_address(&ctl->sg);
599 u32 status;
600
601 ctl->adesc = NULL;
602
603 /* kick next transfer going */
604 __ks8842_start_new_rx_dma(netdev);
605
606 /* now handle the data we got */
607 dma_unmap_single(adapter->dev, addr, DMA_BUFFER_SIZE, DMA_FROM_DEVICE);
608
609 status = *((u32 *)skb->data);
610
611 netdev_dbg(netdev, "%s - rx_data: status: %x\n",
612 __func__, status & 0xffff);
613
614 /* check the status */
615 if ((status & RXSR_VALID) && !(status & RXSR_ERROR)) {
616 int len = (status >> 16) & 0x7ff;
617
618 ks8842_update_rx_counters(netdev, status, len);
619
620 /* reserve 4 bytes which is the status word */
621 skb_reserve(skb, 4);
622 skb_put(skb, len);
623
624 skb->protocol = eth_type_trans(skb, netdev);
625 netif_rx(skb);
626 } else {
627 ks8842_update_rx_err_counters(netdev, status);
628 dev_kfree_skb(skb);
629 }
630}
631
632static void ks8842_rx_frame(struct net_device *netdev,
633 struct ks8842_adapter *adapter)
634{
635 u32 status;
636 int len;
637
638 if (adapter->conf_flags & KS884X_16BIT) {
639 status = ks8842_read16(adapter, 17, REG_QMU_DATA_LO);
640 len = ks8842_read16(adapter, 17, REG_QMU_DATA_HI);
641 netdev_dbg(netdev, "%s - rx_data: status: %x\n",
642 __func__, status);
643 } else {
644 status = ks8842_read32(adapter, 17, REG_QMU_DATA_LO);
645 len = (status >> 16) & 0x7ff;
646 status &= 0xffff;
647 netdev_dbg(netdev, "%s - rx_data: status: %x\n",
648 __func__, status);
649 }
650
651 /* check the status */
652 if ((status & RXSR_VALID) && !(status & RXSR_ERROR)) {
653 struct sk_buff *skb = netdev_alloc_skb_ip_align(netdev, len + 3);
654
655 if (skb) {
656
657 ks8842_update_rx_counters(netdev, status, len);
658
659 if (adapter->conf_flags & KS884X_16BIT) {
660 u16 *data16 = skb_put(skb, len);
661 ks8842_select_bank(adapter, 17);
662 while (len > 0) {
663 *data16++ = ioread16(adapter->hw_addr +
664 REG_QMU_DATA_LO);
665 *data16++ = ioread16(adapter->hw_addr +
666 REG_QMU_DATA_HI);
667 len -= sizeof(u32);
668 }
669 } else {
670 u32 *data = skb_put(skb, len);
671
672 ks8842_select_bank(adapter, 17);
673 while (len > 0) {
674 *data++ = ioread32(adapter->hw_addr +
675 REG_QMU_DATA_LO);
676 len -= sizeof(u32);
677 }
678 }
679 skb->protocol = eth_type_trans(skb, netdev);
680 netif_rx(skb);
681 } else
682 netdev->stats.rx_dropped++;
683 } else
684 ks8842_update_rx_err_counters(netdev, status);
685
686 /* set high watermark to 3K */
687 ks8842_clear_bits(adapter, 0, 1 << 12, REG_QRFCR);
688
689 /* release the frame */
690 ks8842_write16(adapter, 17, 0x01, REG_RXQCR);
691
692 /* set high watermark to 2K */
693 ks8842_enable_bits(adapter, 0, 1 << 12, REG_QRFCR);
694}
695
696static void ks8842_handle_rx(struct net_device *netdev,
697 struct ks8842_adapter *adapter)
698{
699 u16 rx_data = ks8842_read16(adapter, 16, REG_RXMIR) & 0x1fff;
700 netdev_dbg(netdev, "%s Entry - rx_data: %d\n", __func__, rx_data);
701 while (rx_data) {
702 ks8842_rx_frame(netdev, adapter);
703 rx_data = ks8842_read16(adapter, 16, REG_RXMIR) & 0x1fff;
704 }
705}
706
707static void ks8842_handle_tx(struct net_device *netdev,
708 struct ks8842_adapter *adapter)
709{
710 u16 sr = ks8842_read16(adapter, 16, REG_TXSR);
711 netdev_dbg(netdev, "%s - entry, sr: %x\n", __func__, sr);
712 netdev->stats.tx_packets++;
713 if (netif_queue_stopped(netdev))
714 netif_wake_queue(netdev);
715}
716
717static void ks8842_handle_rx_overrun(struct net_device *netdev,
718 struct ks8842_adapter *adapter)
719{
720 netdev_dbg(netdev, "%s: entry\n", __func__);
721 netdev->stats.rx_errors++;
722 netdev->stats.rx_fifo_errors++;
723}
724
725static void ks8842_tasklet(struct tasklet_struct *t)
726{
727 struct ks8842_adapter *adapter = from_tasklet(adapter, t, tasklet);
728 struct net_device *netdev = adapter->netdev;
729 u16 isr;
730 unsigned long flags;
731 u16 entry_bank;
732
733 /* read current bank to be able to set it back */
734 spin_lock_irqsave(&adapter->lock, flags);
735 entry_bank = ioread16(adapter->hw_addr + REG_SELECT_BANK);
736 spin_unlock_irqrestore(&adapter->lock, flags);
737
738 isr = ks8842_read16(adapter, 18, REG_ISR);
739 netdev_dbg(netdev, "%s - ISR: 0x%x\n", __func__, isr);
740
741 /* when running in DMA mode, do not ack RX interrupts, it is handled
742 internally by timberdale, otherwise it's DMA FIFO:s would stop
743 */
744 if (KS8842_USE_DMA(adapter))
745 isr &= ~IRQ_RX;
746
747 /* Ack */
748 ks8842_write16(adapter, 18, isr, REG_ISR);
749
750 if (!(adapter->conf_flags & MICREL_KS884X))
751 /* Ack in the timberdale IP as well */
752 iowrite32(0x1, adapter->hw_addr + REG_TIMB_IAR);
753
754 if (!netif_running(netdev))
755 return;
756
757 if (isr & IRQ_LINK_CHANGE)
758 ks8842_update_link_status(netdev, adapter);
759
760 /* should not get IRQ_RX when running DMA mode */
761 if (isr & (IRQ_RX | IRQ_RX_ERROR) && !KS8842_USE_DMA(adapter))
762 ks8842_handle_rx(netdev, adapter);
763
764 /* should only happen when in PIO mode */
765 if (isr & IRQ_TX)
766 ks8842_handle_tx(netdev, adapter);
767
768 if (isr & IRQ_RX_OVERRUN)
769 ks8842_handle_rx_overrun(netdev, adapter);
770
771 if (isr & IRQ_TX_STOPPED) {
772 ks8842_disable_tx(adapter);
773 ks8842_enable_tx(adapter);
774 }
775
776 if (isr & IRQ_RX_STOPPED) {
777 ks8842_disable_rx(adapter);
778 ks8842_enable_rx(adapter);
779 }
780
781 /* re-enable interrupts, put back the bank selection register */
782 spin_lock_irqsave(&adapter->lock, flags);
783 if (KS8842_USE_DMA(adapter))
784 ks8842_write16(adapter, 18, ENABLED_IRQS_DMA, REG_IER);
785 else
786 ks8842_write16(adapter, 18, ENABLED_IRQS, REG_IER);
787 iowrite16(entry_bank, adapter->hw_addr + REG_SELECT_BANK);
788
789 /* Make sure timberdale continues DMA operations, they are stopped while
790 we are handling the ks8842 because we might change bank */
791 if (KS8842_USE_DMA(adapter))
792 ks8842_resume_dma(adapter);
793
794 spin_unlock_irqrestore(&adapter->lock, flags);
795}
796
797static irqreturn_t ks8842_irq(int irq, void *devid)
798{
799 struct net_device *netdev = devid;
800 struct ks8842_adapter *adapter = netdev_priv(netdev);
801 u16 isr;
802 u16 entry_bank = ioread16(adapter->hw_addr + REG_SELECT_BANK);
803 irqreturn_t ret = IRQ_NONE;
804
805 isr = ks8842_read16(adapter, 18, REG_ISR);
806 netdev_dbg(netdev, "%s - ISR: 0x%x\n", __func__, isr);
807
808 if (isr) {
809 if (KS8842_USE_DMA(adapter))
810 /* disable all but RX IRQ, since the FPGA relies on it*/
811 ks8842_write16(adapter, 18, IRQ_RX, REG_IER);
812 else
813 /* disable IRQ */
814 ks8842_write16(adapter, 18, 0x00, REG_IER);
815
816 /* schedule tasklet */
817 tasklet_schedule(&adapter->tasklet);
818
819 ret = IRQ_HANDLED;
820 }
821
822 iowrite16(entry_bank, adapter->hw_addr + REG_SELECT_BANK);
823
824 /* After an interrupt, tell timberdale to continue DMA operations.
825 DMA is disabled while we are handling the ks8842 because we might
826 change bank */
827 ks8842_resume_dma(adapter);
828
829 return ret;
830}
831
832static void ks8842_dma_rx_cb(void *data)
833{
834 struct net_device *netdev = data;
835 struct ks8842_adapter *adapter = netdev_priv(netdev);
836
837 netdev_dbg(netdev, "RX DMA finished\n");
838 /* schedule tasklet */
839 if (adapter->dma_rx.adesc)
840 tasklet_schedule(&adapter->dma_rx.tasklet);
841}
842
843static void ks8842_dma_tx_cb(void *data)
844{
845 struct net_device *netdev = data;
846 struct ks8842_adapter *adapter = netdev_priv(netdev);
847 struct ks8842_tx_dma_ctl *ctl = &adapter->dma_tx;
848
849 netdev_dbg(netdev, "TX DMA finished\n");
850
851 if (!ctl->adesc)
852 return;
853
854 netdev->stats.tx_packets++;
855 ctl->adesc = NULL;
856
857 if (netif_queue_stopped(netdev))
858 netif_wake_queue(netdev);
859}
860
861static void ks8842_stop_dma(struct ks8842_adapter *adapter)
862{
863 struct ks8842_tx_dma_ctl *tx_ctl = &adapter->dma_tx;
864 struct ks8842_rx_dma_ctl *rx_ctl = &adapter->dma_rx;
865
866 tx_ctl->adesc = NULL;
867 if (tx_ctl->chan)
868 dmaengine_terminate_all(tx_ctl->chan);
869
870 rx_ctl->adesc = NULL;
871 if (rx_ctl->chan)
872 dmaengine_terminate_all(rx_ctl->chan);
873
874 if (sg_dma_address(&rx_ctl->sg))
875 dma_unmap_single(adapter->dev, sg_dma_address(&rx_ctl->sg),
876 DMA_BUFFER_SIZE, DMA_FROM_DEVICE);
877 sg_dma_address(&rx_ctl->sg) = 0;
878
879 dev_kfree_skb(rx_ctl->skb);
880 rx_ctl->skb = NULL;
881}
882
883static void ks8842_dealloc_dma_bufs(struct ks8842_adapter *adapter)
884{
885 struct ks8842_tx_dma_ctl *tx_ctl = &adapter->dma_tx;
886 struct ks8842_rx_dma_ctl *rx_ctl = &adapter->dma_rx;
887
888 ks8842_stop_dma(adapter);
889
890 if (tx_ctl->chan)
891 dma_release_channel(tx_ctl->chan);
892 tx_ctl->chan = NULL;
893
894 if (rx_ctl->chan)
895 dma_release_channel(rx_ctl->chan);
896 rx_ctl->chan = NULL;
897
898 tasklet_kill(&rx_ctl->tasklet);
899
900 if (sg_dma_address(&tx_ctl->sg))
901 dma_unmap_single(adapter->dev, sg_dma_address(&tx_ctl->sg),
902 DMA_BUFFER_SIZE, DMA_TO_DEVICE);
903 sg_dma_address(&tx_ctl->sg) = 0;
904
905 kfree(tx_ctl->buf);
906 tx_ctl->buf = NULL;
907}
908
909static bool ks8842_dma_filter_fn(struct dma_chan *chan, void *filter_param)
910{
911 return chan->chan_id == (long)filter_param;
912}
913
914static int ks8842_alloc_dma_bufs(struct net_device *netdev)
915{
916 struct ks8842_adapter *adapter = netdev_priv(netdev);
917 struct ks8842_tx_dma_ctl *tx_ctl = &adapter->dma_tx;
918 struct ks8842_rx_dma_ctl *rx_ctl = &adapter->dma_rx;
919 int err;
920
921 dma_cap_mask_t mask;
922
923 dma_cap_zero(mask);
924 dma_cap_set(DMA_SLAVE, mask);
925 dma_cap_set(DMA_PRIVATE, mask);
926
927 sg_init_table(&tx_ctl->sg, 1);
928
929 tx_ctl->chan = dma_request_channel(mask, ks8842_dma_filter_fn,
930 (void *)(long)tx_ctl->channel);
931 if (!tx_ctl->chan) {
932 err = -ENODEV;
933 goto err;
934 }
935
936 /* allocate DMA buffer */
937 tx_ctl->buf = kmalloc(DMA_BUFFER_SIZE, GFP_KERNEL);
938 if (!tx_ctl->buf) {
939 err = -ENOMEM;
940 goto err;
941 }
942
943 sg_dma_address(&tx_ctl->sg) = dma_map_single(adapter->dev,
944 tx_ctl->buf, DMA_BUFFER_SIZE, DMA_TO_DEVICE);
945 if (dma_mapping_error(adapter->dev, sg_dma_address(&tx_ctl->sg))) {
946 err = -ENOMEM;
947 sg_dma_address(&tx_ctl->sg) = 0;
948 goto err;
949 }
950
951 rx_ctl->chan = dma_request_channel(mask, ks8842_dma_filter_fn,
952 (void *)(long)rx_ctl->channel);
953 if (!rx_ctl->chan) {
954 err = -ENODEV;
955 goto err;
956 }
957
958 tasklet_setup(&rx_ctl->tasklet, ks8842_rx_frame_dma_tasklet);
959
960 return 0;
961err:
962 ks8842_dealloc_dma_bufs(adapter);
963 return err;
964}
965
966/* Netdevice operations */
967
968static int ks8842_open(struct net_device *netdev)
969{
970 struct ks8842_adapter *adapter = netdev_priv(netdev);
971 int err;
972
973 netdev_dbg(netdev, "%s - entry\n", __func__);
974
975 if (KS8842_USE_DMA(adapter)) {
976 err = ks8842_alloc_dma_bufs(netdev);
977
978 if (!err) {
979 /* start RX dma */
980 err = __ks8842_start_new_rx_dma(netdev);
981 if (err)
982 ks8842_dealloc_dma_bufs(adapter);
983 }
984
985 if (err) {
986 printk(KERN_WARNING DRV_NAME
987 ": Failed to initiate DMA, running PIO\n");
988 ks8842_dealloc_dma_bufs(adapter);
989 adapter->dma_rx.channel = -1;
990 adapter->dma_tx.channel = -1;
991 }
992 }
993
994 /* reset the HW */
995 ks8842_reset_hw(adapter);
996
997 ks8842_write_mac_addr(adapter, netdev->dev_addr);
998
999 ks8842_update_link_status(netdev, adapter);
1000
1001 err = request_irq(adapter->irq, ks8842_irq, IRQF_SHARED, DRV_NAME,
1002 netdev);
1003 if (err) {
1004 pr_err("Failed to request IRQ: %d: %d\n", adapter->irq, err);
1005 return err;
1006 }
1007
1008 return 0;
1009}
1010
1011static int ks8842_close(struct net_device *netdev)
1012{
1013 struct ks8842_adapter *adapter = netdev_priv(netdev);
1014
1015 netdev_dbg(netdev, "%s - entry\n", __func__);
1016
1017 cancel_work_sync(&adapter->timeout_work);
1018
1019 if (KS8842_USE_DMA(adapter))
1020 ks8842_dealloc_dma_bufs(adapter);
1021
1022 /* free the irq */
1023 free_irq(adapter->irq, netdev);
1024
1025 /* disable the switch */
1026 ks8842_write16(adapter, 32, 0x0, REG_SW_ID_AND_ENABLE);
1027
1028 return 0;
1029}
1030
1031static netdev_tx_t ks8842_xmit_frame(struct sk_buff *skb,
1032 struct net_device *netdev)
1033{
1034 int ret;
1035 struct ks8842_adapter *adapter = netdev_priv(netdev);
1036
1037 netdev_dbg(netdev, "%s: entry\n", __func__);
1038
1039 if (KS8842_USE_DMA(adapter)) {
1040 unsigned long flags;
1041 ret = ks8842_tx_frame_dma(skb, netdev);
1042 /* for now only allow one transfer at the time */
1043 spin_lock_irqsave(&adapter->lock, flags);
1044 if (adapter->dma_tx.adesc)
1045 netif_stop_queue(netdev);
1046 spin_unlock_irqrestore(&adapter->lock, flags);
1047 return ret;
1048 }
1049
1050 ret = ks8842_tx_frame(skb, netdev);
1051
1052 if (ks8842_tx_fifo_space(adapter) < netdev->mtu + 8)
1053 netif_stop_queue(netdev);
1054
1055 return ret;
1056}
1057
1058static int ks8842_set_mac(struct net_device *netdev, void *p)
1059{
1060 struct ks8842_adapter *adapter = netdev_priv(netdev);
1061 struct sockaddr *addr = p;
1062 char *mac = (u8 *)addr->sa_data;
1063
1064 netdev_dbg(netdev, "%s: entry\n", __func__);
1065
1066 if (!is_valid_ether_addr(addr->sa_data))
1067 return -EADDRNOTAVAIL;
1068
1069 eth_hw_addr_set(netdev, mac);
1070
1071 ks8842_write_mac_addr(adapter, mac);
1072 return 0;
1073}
1074
1075static void ks8842_tx_timeout_work(struct work_struct *work)
1076{
1077 struct ks8842_adapter *adapter =
1078 container_of(work, struct ks8842_adapter, timeout_work);
1079 struct net_device *netdev = adapter->netdev;
1080 unsigned long flags;
1081
1082 netdev_dbg(netdev, "%s: entry\n", __func__);
1083
1084 spin_lock_irqsave(&adapter->lock, flags);
1085
1086 if (KS8842_USE_DMA(adapter))
1087 ks8842_stop_dma(adapter);
1088
1089 /* disable interrupts */
1090 ks8842_write16(adapter, 18, 0, REG_IER);
1091 ks8842_write16(adapter, 18, 0xFFFF, REG_ISR);
1092
1093 netif_stop_queue(netdev);
1094
1095 spin_unlock_irqrestore(&adapter->lock, flags);
1096
1097 ks8842_reset_hw(adapter);
1098
1099 ks8842_write_mac_addr(adapter, netdev->dev_addr);
1100
1101 ks8842_update_link_status(netdev, adapter);
1102
1103 if (KS8842_USE_DMA(adapter))
1104 __ks8842_start_new_rx_dma(netdev);
1105}
1106
1107static void ks8842_tx_timeout(struct net_device *netdev, unsigned int txqueue)
1108{
1109 struct ks8842_adapter *adapter = netdev_priv(netdev);
1110
1111 netdev_dbg(netdev, "%s: entry\n", __func__);
1112
1113 schedule_work(&adapter->timeout_work);
1114}
1115
1116static const struct net_device_ops ks8842_netdev_ops = {
1117 .ndo_open = ks8842_open,
1118 .ndo_stop = ks8842_close,
1119 .ndo_start_xmit = ks8842_xmit_frame,
1120 .ndo_set_mac_address = ks8842_set_mac,
1121 .ndo_tx_timeout = ks8842_tx_timeout,
1122 .ndo_validate_addr = eth_validate_addr
1123};
1124
1125static const struct ethtool_ops ks8842_ethtool_ops = {
1126 .get_link = ethtool_op_get_link,
1127};
1128
1129static int ks8842_probe(struct platform_device *pdev)
1130{
1131 int err = -ENOMEM;
1132 struct resource *iomem;
1133 struct net_device *netdev;
1134 struct ks8842_adapter *adapter;
1135 struct ks8842_platform_data *pdata = dev_get_platdata(&pdev->dev);
1136 u16 id;
1137 unsigned i;
1138
1139 iomem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1140 if (!iomem) {
1141 dev_err(&pdev->dev, "Invalid resource\n");
1142 return -EINVAL;
1143 }
1144 if (!request_mem_region(iomem->start, resource_size(iomem), DRV_NAME))
1145 goto err_mem_region;
1146
1147 netdev = alloc_etherdev(sizeof(struct ks8842_adapter));
1148 if (!netdev)
1149 goto err_alloc_etherdev;
1150
1151 SET_NETDEV_DEV(netdev, &pdev->dev);
1152
1153 adapter = netdev_priv(netdev);
1154 adapter->netdev = netdev;
1155 INIT_WORK(&adapter->timeout_work, ks8842_tx_timeout_work);
1156 adapter->hw_addr = ioremap(iomem->start, resource_size(iomem));
1157 adapter->conf_flags = iomem->flags;
1158
1159 if (!adapter->hw_addr)
1160 goto err_ioremap;
1161
1162 adapter->irq = platform_get_irq(pdev, 0);
1163 if (adapter->irq < 0) {
1164 err = adapter->irq;
1165 goto err_get_irq;
1166 }
1167
1168 adapter->dev = (pdev->dev.parent) ? pdev->dev.parent : &pdev->dev;
1169
1170 /* DMA is only supported when accessed via timberdale */
1171 if (!(adapter->conf_flags & MICREL_KS884X) && pdata &&
1172 (pdata->tx_dma_channel != -1) &&
1173 (pdata->rx_dma_channel != -1)) {
1174 adapter->dma_rx.channel = pdata->rx_dma_channel;
1175 adapter->dma_tx.channel = pdata->tx_dma_channel;
1176 } else {
1177 adapter->dma_rx.channel = -1;
1178 adapter->dma_tx.channel = -1;
1179 }
1180
1181 tasklet_setup(&adapter->tasklet, ks8842_tasklet);
1182 spin_lock_init(&adapter->lock);
1183
1184 netdev->netdev_ops = &ks8842_netdev_ops;
1185 netdev->ethtool_ops = &ks8842_ethtool_ops;
1186
1187 /* Check if a mac address was given */
1188 i = netdev->addr_len;
1189 if (pdata) {
1190 for (i = 0; i < netdev->addr_len; i++)
1191 if (pdata->macaddr[i] != 0)
1192 break;
1193
1194 if (i < netdev->addr_len)
1195 /* an address was passed, use it */
1196 eth_hw_addr_set(netdev, pdata->macaddr);
1197 }
1198
1199 if (i == netdev->addr_len) {
1200 ks8842_init_mac_addr(adapter);
1201
1202 if (!is_valid_ether_addr(netdev->dev_addr))
1203 eth_hw_addr_random(netdev);
1204 }
1205
1206 id = ks8842_read16(adapter, 32, REG_SW_ID_AND_ENABLE);
1207
1208 strcpy(netdev->name, "eth%d");
1209 err = register_netdev(netdev);
1210 if (err)
1211 goto err_register;
1212
1213 platform_set_drvdata(pdev, netdev);
1214
1215 pr_info("Found chip, family: 0x%x, id: 0x%x, rev: 0x%x\n",
1216 (id >> 8) & 0xff, (id >> 4) & 0xf, (id >> 1) & 0x7);
1217
1218 return 0;
1219
1220err_register:
1221err_get_irq:
1222 iounmap(adapter->hw_addr);
1223err_ioremap:
1224 free_netdev(netdev);
1225err_alloc_etherdev:
1226 release_mem_region(iomem->start, resource_size(iomem));
1227err_mem_region:
1228 return err;
1229}
1230
1231static void ks8842_remove(struct platform_device *pdev)
1232{
1233 struct net_device *netdev = platform_get_drvdata(pdev);
1234 struct ks8842_adapter *adapter = netdev_priv(netdev);
1235 struct resource *iomem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1236
1237 unregister_netdev(netdev);
1238 tasklet_kill(&adapter->tasklet);
1239 iounmap(adapter->hw_addr);
1240 free_netdev(netdev);
1241 release_mem_region(iomem->start, resource_size(iomem));
1242}
1243
1244
1245static struct platform_driver ks8842_platform_driver = {
1246 .driver = {
1247 .name = DRV_NAME,
1248 },
1249 .probe = ks8842_probe,
1250 .remove_new = ks8842_remove,
1251};
1252
1253module_platform_driver(ks8842_platform_driver);
1254
1255MODULE_DESCRIPTION("Timberdale KS8842 ethernet driver");
1256MODULE_AUTHOR("Mocean Laboratories <info@mocean-labs.com>");
1257MODULE_LICENSE("GPL v2");
1258MODULE_ALIAS("platform:ks8842");
1259