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stmmac: fix automatic PAD/FCS stripping
[linux-2.6-block.git] / drivers / net / ks8842.c
CommitLineData
\9aöjfors, 2009-06-04 03:35:55 +0000">b07878e5 1/*
a1aa8822 2 * ks8842.c timberdale KS8842 ethernet driver
\9aöjfors, 2009-06-04 03:35:55 +0000" rowspan="18">b07878e5
R		 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
28bd620c 21 * The genuine Micrel KS8841/42 device with ISA 16/32bit bus interface
\9aöjfors, 2009-06-04 03:35:55 +0000" rowspan="2">b07878e5
R		 22 */
23
0dc7d2b3
JP		 24#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
25
\9aöjfors, 2009-06-04 03:35:55 +0000" rowspan="6">b07878e5
R		 26#include <linux/kernel.h>
27#include <linux/module.h>
28#include <linux/platform_device.h>
29#include <linux/netdevice.h>
30#include <linux/etherdevice.h>
31#include <linux/ethtool.h>
a1aa8822 32#include <linux/ks8842.h>
\9aöjfors, 2009-06-04 03:35:55 +0000" rowspan="4">b07878e5
R		 33
34#define DRV_NAME "ks8842"
35
36/* Timberdale specific Registers */
db5824dd
RR		 37#define REG_TIMB_RST 0x1c
38#define REG_TIMB_FIFO 0x20
39#define REG_TIMB_ISR 0x24
40#define REG_TIMB_IER 0x28
41#define REG_TIMB_IAR 0x2C
42#define REQ_TIMB_DMA_RESUME 0x30
\9aöjfors, 2009-06-04 03:35:55 +0000" rowspan="80">b07878e5
R		 43
44/* KS8842 registers */
45
46#define REG_SELECT_BANK 0x0e
47
48/* bank 0 registers */
49#define REG_QRFCR 0x04
50
51/* bank 2 registers */
52#define REG_MARL 0x00
53#define REG_MARM 0x02
54#define REG_MARH 0x04
55
56/* bank 3 registers */
57#define REG_GRR 0x06
58
59/* bank 16 registers */
60#define REG_TXCR 0x00
61#define REG_TXSR 0x02
62#define REG_RXCR 0x04
63#define REG_TXMIR 0x08
64#define REG_RXMIR 0x0A
65
66/* bank 17 registers */
67#define REG_TXQCR 0x00
68#define REG_RXQCR 0x02
69#define REG_TXFDPR 0x04
70#define REG_RXFDPR 0x06
71#define REG_QMU_DATA_LO 0x08
72#define REG_QMU_DATA_HI 0x0A
73
74/* bank 18 registers */
75#define REG_IER 0x00
76#define IRQ_LINK_CHANGE 0x8000
77#define IRQ_TX 0x4000
78#define IRQ_RX 0x2000
79#define IRQ_RX_OVERRUN 0x0800
80#define IRQ_TX_STOPPED 0x0200
81#define IRQ_RX_STOPPED 0x0100
82#define IRQ_RX_ERROR 0x0080
83#define ENABLED_IRQS (IRQ_LINK_CHANGE | IRQ_TX | IRQ_RX | IRQ_RX_STOPPED | \
84 IRQ_TX_STOPPED | IRQ_RX_OVERRUN | IRQ_RX_ERROR)
85#define REG_ISR 0x02
86#define REG_RXSR 0x04
87#define RXSR_VALID 0x8000
88#define RXSR_BROADCAST 0x80
89#define RXSR_MULTICAST 0x40
90#define RXSR_UNICAST 0x20
91#define RXSR_FRAMETYPE 0x08
92#define RXSR_TOO_LONG 0x04
93#define RXSR_RUNT 0x02
94#define RXSR_CRC_ERROR 0x01
95#define RXSR_ERROR (RXSR_TOO_LONG | RXSR_RUNT | RXSR_CRC_ERROR)
96
97/* bank 32 registers */
98#define REG_SW_ID_AND_ENABLE 0x00
99#define REG_SGCR1 0x02
100#define REG_SGCR2 0x04
101#define REG_SGCR3 0x06
102
103/* bank 39 registers */
104#define REG_MACAR1 0x00
105#define REG_MACAR2 0x02
106#define REG_MACAR3 0x04
107
108/* bank 45 registers */
109#define REG_P1MBCR 0x00
110#define REG_P1MBSR 0x02
111
112/* bank 46 registers */
113#define REG_P2MBCR 0x00
114#define REG_P2MBSR 0x02
115
116/* bank 48 registers */
117#define REG_P1CR2 0x02
118
119/* bank 49 registers */
120#define REG_P1CR4 0x02
121#define REG_P1SR 0x04
122
28bd620c
DC		 123/* flags passed by platform_device for configuration */
124#define MICREL_KS884X 0x01 /* 0=Timeberdale(FPGA), 1=Micrel */
125#define KS884X_16BIT 0x02 /* 1=16bit, 0=32bit */
126
\9aöjfors, 2009-06-04 03:35:55 +0000" rowspan="3">b07878e5
R		 127struct ks8842_adapter {
128 void __iomem *hw_addr;
129 int irq;
28bd620c 130 unsigned long conf_flags; /* copy of platform_device config */
\9aöjfors, 2009-06-04 03:35:55 +0000" rowspan="2">b07878e5
R		 131 struct tasklet_struct tasklet;
132 spinlock_t lock; /* spinlock to be interrupt safe */
cc88e450
RR		 133 struct work_struct timeout_work;
134 struct net_device *netdev;
\9aöjfors, 2009-06-04 03:35:55 +0000" rowspan="71">b07878e5
R		 135};
136
137static inline void ks8842_select_bank(struct ks8842_adapter *adapter, u16 bank)
138{
139 iowrite16(bank, adapter->hw_addr + REG_SELECT_BANK);
140}
141
142static inline void ks8842_write8(struct ks8842_adapter *adapter, u16 bank,
143 u8 value, int offset)
144{
145 ks8842_select_bank(adapter, bank);
146 iowrite8(value, adapter->hw_addr + offset);
147}
148
149static inline void ks8842_write16(struct ks8842_adapter *adapter, u16 bank,
150 u16 value, int offset)
151{
152 ks8842_select_bank(adapter, bank);
153 iowrite16(value, adapter->hw_addr + offset);
154}
155
156static inline void ks8842_enable_bits(struct ks8842_adapter *adapter, u16 bank,
157 u16 bits, int offset)
158{
159 u16 reg;
160 ks8842_select_bank(adapter, bank);
161 reg = ioread16(adapter->hw_addr + offset);
162 reg |= bits;
163 iowrite16(reg, adapter->hw_addr + offset);
164}
165
166static inline void ks8842_clear_bits(struct ks8842_adapter *adapter, u16 bank,
167 u16 bits, int offset)
168{
169 u16 reg;
170 ks8842_select_bank(adapter, bank);
171 reg = ioread16(adapter->hw_addr + offset);
172 reg &= ~bits;
173 iowrite16(reg, adapter->hw_addr + offset);
174}
175
176static inline void ks8842_write32(struct ks8842_adapter *adapter, u16 bank,
177 u32 value, int offset)
178{
179 ks8842_select_bank(adapter, bank);
180 iowrite32(value, adapter->hw_addr + offset);
181}
182
183static inline u8 ks8842_read8(struct ks8842_adapter *adapter, u16 bank,
184 int offset)
185{
186 ks8842_select_bank(adapter, bank);
187 return ioread8(adapter->hw_addr + offset);
188}
189
190static inline u16 ks8842_read16(struct ks8842_adapter *adapter, u16 bank,
191 int offset)
192{
193 ks8842_select_bank(adapter, bank);
194 return ioread16(adapter->hw_addr + offset);
195}
196
197static inline u32 ks8842_read32(struct ks8842_adapter *adapter, u16 bank,
198 int offset)
199{
200 ks8842_select_bank(adapter, bank);
201 return ioread32(adapter->hw_addr + offset);
202}
203
204static void ks8842_reset(struct ks8842_adapter *adapter)
205{
28bd620c
DC		 206 if (adapter->conf_flags & MICREL_KS884X) {
207 ks8842_write16(adapter, 3, 1, REG_GRR);
208 msleep(10);
209 iowrite16(0, adapter->hw_addr + REG_GRR);
210 } else {
211 /* The KS8842 goes haywire when doing softare reset
212 * a work around in the timberdale IP is implemented to
213 * do a hardware reset instead
214 ks8842_write16(adapter, 3, 1, REG_GRR);
215 msleep(10);
216 iowrite16(0, adapter->hw_addr + REG_GRR);
217 */
218 iowrite32(0x1, adapter->hw_addr + REG_TIMB_RST);
219 msleep(20);
220 }
\9aöjfors, 2009-06-04 03:35:55 +0000" rowspan="68">b07878e5
R		 221}
222
223static void ks8842_update_link_status(struct net_device *netdev,
224 struct ks8842_adapter *adapter)
225{
226 /* check the status of the link */
227 if (ks8842_read16(adapter, 45, REG_P1MBSR) & 0x4) {
228 netif_carrier_on(netdev);
229 netif_wake_queue(netdev);
230 } else {
231 netif_stop_queue(netdev);
232 netif_carrier_off(netdev);
233 }
234}
235
236static void ks8842_enable_tx(struct ks8842_adapter *adapter)
237{
238 ks8842_enable_bits(adapter, 16, 0x01, REG_TXCR);
239}
240
241static void ks8842_disable_tx(struct ks8842_adapter *adapter)
242{
243 ks8842_clear_bits(adapter, 16, 0x01, REG_TXCR);
244}
245
246static void ks8842_enable_rx(struct ks8842_adapter *adapter)
247{
248 ks8842_enable_bits(adapter, 16, 0x01, REG_RXCR);
249}
250
251static void ks8842_disable_rx(struct ks8842_adapter *adapter)
252{
253 ks8842_clear_bits(adapter, 16, 0x01, REG_RXCR);
254}
255
256static void ks8842_reset_hw(struct ks8842_adapter *adapter)
257{
258 /* reset the HW */
259 ks8842_reset(adapter);
260
261 /* Enable QMU Transmit flow control / transmit padding / Transmit CRC */
262 ks8842_write16(adapter, 16, 0x000E, REG_TXCR);
263
264 /* enable the receiver, uni + multi + broadcast + flow ctrl
265 + crc strip */
266 ks8842_write16(adapter, 16, 0x8 | 0x20 | 0x40 | 0x80 | 0x400,
267 REG_RXCR);
268
269 /* TX frame pointer autoincrement */
270 ks8842_write16(adapter, 17, 0x4000, REG_TXFDPR);
271
272 /* RX frame pointer autoincrement */
273 ks8842_write16(adapter, 17, 0x4000, REG_RXFDPR);
274
275 /* RX 2 kb high watermark */
276 ks8842_write16(adapter, 0, 0x1000, REG_QRFCR);
277
278 /* aggresive back off in half duplex */
279 ks8842_enable_bits(adapter, 32, 1 << 8, REG_SGCR1);
280
281 /* enable no excessive collison drop */
282 ks8842_enable_bits(adapter, 32, 1 << 3, REG_SGCR2);
283
284 /* Enable port 1 force flow control / back pressure / transmit / recv */
285 ks8842_write16(adapter, 48, 0x1E07, REG_P1CR2);
286
287 /* restart port auto-negotiation */
288 ks8842_enable_bits(adapter, 49, 1 << 13, REG_P1CR4);
28bd620c 289
\9aöjfors, 2009-06-04 03:35:55 +0000" rowspan="24">b07878e5
R		 290 /* Enable the transmitter */
291 ks8842_enable_tx(adapter);
292
293 /* Enable the receiver */
294 ks8842_enable_rx(adapter);
295
296 /* clear all interrupts */
297 ks8842_write16(adapter, 18, 0xffff, REG_ISR);
298
299 /* enable interrupts */
300 ks8842_write16(adapter, 18, ENABLED_IRQS, REG_IER);
301
302 /* enable the switch */
303 ks8842_write16(adapter, 32, 0x1, REG_SW_ID_AND_ENABLE);
304}
305
306static void ks8842_read_mac_addr(struct ks8842_adapter *adapter, u8 *dest)
307{
308 int i;
309 u16 mac;
310
311 for (i = 0; i < ETH_ALEN; i++)
312 dest[ETH_ALEN - i - 1] = ks8842_read8(adapter, 2, REG_MARL + i);
313
28bd620c
DC		 314 if (adapter->conf_flags & MICREL_KS884X) {
315 /*
316 the sequence of saving mac addr between MAC and Switch is
317 different.
318 */
319
320 mac = ks8842_read16(adapter, 2, REG_MARL);
321 ks8842_write16(adapter, 39, mac, REG_MACAR3);
322 mac = ks8842_read16(adapter, 2, REG_MARM);
323 ks8842_write16(adapter, 39, mac, REG_MACAR2);
324 mac = ks8842_read16(adapter, 2, REG_MARH);
325 ks8842_write16(adapter, 39, mac, REG_MACAR1);
326 } else {
327
328 /* make sure the switch port uses the same MAC as the QMU */
329 mac = ks8842_read16(adapter, 2, REG_MARL);
330 ks8842_write16(adapter, 39, mac, REG_MACAR1);
331 mac = ks8842_read16(adapter, 2, REG_MARM);
332 ks8842_write16(adapter, 39, mac, REG_MACAR2);
333 mac = ks8842_read16(adapter, 2, REG_MARH);
334 ks8842_write16(adapter, 39, mac, REG_MACAR3);
335 }
\9aöjfors, 2009-06-04 03:35:55 +0000" rowspan="2">b07878e5
R		 336}
337
a1aa8822
RR		 338static void ks8842_write_mac_addr(struct ks8842_adapter *adapter, u8 *mac)
339{
340 unsigned long flags;
341 unsigned i;
342
343 spin_lock_irqsave(&adapter->lock, flags);
344 for (i = 0; i < ETH_ALEN; i++) {
345 ks8842_write8(adapter, 2, mac[ETH_ALEN - i - 1], REG_MARL + i);
28bd620c
DC		 346 if (!(adapter->conf_flags & MICREL_KS884X))
347 ks8842_write8(adapter, 39, mac[ETH_ALEN - i - 1],
348 REG_MACAR1 + i);
349 }
350
351 if (adapter->conf_flags & MICREL_KS884X) {
352 /*
353 the sequence of saving mac addr between MAC and Switch is
354 different.
355 */
356
357 u16 mac;
358
359 mac = ks8842_read16(adapter, 2, REG_MARL);
360 ks8842_write16(adapter, 39, mac, REG_MACAR3);
361 mac = ks8842_read16(adapter, 2, REG_MARM);
362 ks8842_write16(adapter, 39, mac, REG_MACAR2);
363 mac = ks8842_read16(adapter, 2, REG_MARH);
364 ks8842_write16(adapter, 39, mac, REG_MACAR1);
a1aa8822
RR		 365 }
366 spin_unlock_irqrestore(&adapter->lock, flags);
367}
368
\9aöjfors, 2009-06-04 03:35:55 +0000" rowspan="9">b07878e5
R		 369static inline u16 ks8842_tx_fifo_space(struct ks8842_adapter *adapter)
370{
371 return ks8842_read16(adapter, 16, REG_TXMIR) & 0x1fff;
372}
373
374static int ks8842_tx_frame(struct sk_buff *skb, struct net_device *netdev)
375{
376 struct ks8842_adapter *adapter = netdev_priv(netdev);
377 int len = skb->len;
\9aöjfors, 2009-06-04 03:35:55 +0000">b07878e5 378
a99db196 379 netdev_dbg(netdev, "%s: len %u head %p data %p tail %p end %p\n",
\9aöjfors, 2009-06-04 03:35:55 +0000" rowspan="7">b07878e5
R		 380 __func__, skb->len, skb->head, skb->data,
381 skb_tail_pointer(skb), skb_end_pointer(skb));
382
383 /* check FIFO buffer space, we need space for CRC and command bits */
384 if (ks8842_tx_fifo_space(adapter) < len + 8)
385 return NETDEV_TX_BUSY;
386
28bd620c
DC		 387 if (adapter->conf_flags & KS884X_16BIT) {
388 u16 *ptr16 = (u16 *)skb->data;
389 ks8842_write16(adapter, 17, 0x8000 | 0x100, REG_QMU_DATA_LO);
390 ks8842_write16(adapter, 17, (u16)len, REG_QMU_DATA_HI);
391 netdev->stats.tx_bytes += len;
392
393 /* copy buffer */
394 while (len > 0) {
395 iowrite16(*ptr16++, adapter->hw_addr + REG_QMU_DATA_LO);
396 iowrite16(*ptr16++, adapter->hw_addr + REG_QMU_DATA_HI);
397 len -= sizeof(u32);
398 }
399 } else {
400
401 u32 *ptr = (u32 *)skb->data;
402 u32 ctrl;
403 /* the control word, enable IRQ, port 1 and the length */
404 ctrl = 0x8000 | 0x100 | (len << 16);
405 ks8842_write32(adapter, 17, ctrl, REG_QMU_DATA_LO);
\9aöjfors, 2009-06-04 03:35:55 +0000">b07878e5 406
28bd620c 407 netdev->stats.tx_bytes += len;
\9aöjfors, 2009-06-04 03:35:55 +0000">b07878e5 408
28bd620c
DC		 409 /* copy buffer */
410 while (len > 0) {
411 iowrite32(*ptr, adapter->hw_addr + REG_QMU_DATA_LO);
412 len -= sizeof(u32);
413 ptr++;
414 }
\9aöjfors, 2009-06-04 03:35:55 +0000" rowspan="13">b07878e5
R		 415 }
416
417 /* enqueue packet */
418 ks8842_write16(adapter, 17, 1, REG_TXQCR);
419
420 dev_kfree_skb(skb);
421
422 return NETDEV_TX_OK;
423}
424
425static void ks8842_rx_frame(struct net_device *netdev,
426 struct ks8842_adapter *adapter)
427{
28bd620c
DC		 428 u32 status;
429 int len;
\9aöjfors, 2009-06-04 03:35:55 +0000">b07878e5 430
28bd620c 431 if (adapter->conf_flags & KS884X_16BIT) {
e2df8b7f
DM		 432 status = ks8842_read16(adapter, 17, REG_QMU_DATA_LO);
433 len = ks8842_read16(adapter, 17, REG_QMU_DATA_HI);
28bd620c 434 netdev_dbg(netdev, "%s - rx_data: status: %x\n",
e2df8b7f 435 __func__, status);
28bd620c
DC		 436 } else {
437 status = ks8842_read32(adapter, 17, REG_QMU_DATA_LO);
438 len = (status >> 16) & 0x7ff;
439 status &= 0xffff;
440 netdev_dbg(netdev, "%s - rx_data: status: %x\n",
441 __func__, status);
442 }
\9aöjfors, 2009-06-04 03:35:55 +0000" rowspan="3">b07878e5
R		 443
444 /* check the status */
445 if ((status & RXSR_VALID) && !(status & RXSR_ERROR)) {
89d71a66 446 struct sk_buff *skb = netdev_alloc_skb_ip_align(netdev, len);
\9aöjfors, 2009-06-04 03:35:55 +0000">b07878e5 447
a99db196 448 netdev_dbg(netdev, "%s, got package, len: %d\n", __func__, len);
\9aöjfors, 2009-06-04 03:35:55 +0000">b07878e5 449 if (skb) {
\9aöjfors, 2009-06-04 03:35:55 +0000" rowspan="6">b07878e5
R		 450
451 netdev->stats.rx_packets++;
452 netdev->stats.rx_bytes += len;
453 if (status & RXSR_MULTICAST)
454 netdev->stats.multicast++;
455
28bd620c
DC		 456 if (adapter->conf_flags & KS884X_16BIT) {
457 u16 *data16 = (u16 *)skb_put(skb, len);
458 ks8842_select_bank(adapter, 17);
459 while (len > 0) {
460 *data16++ = ioread16(adapter->hw_addr +
461 REG_QMU_DATA_LO);
462 *data16++ = ioread16(adapter->hw_addr +
463 REG_QMU_DATA_HI);
464 len -= sizeof(u32);
465 }
466 } else {
467 u32 *data = (u32 *)skb_put(skb, len);
468
469 ks8842_select_bank(adapter, 17);
470 while (len > 0) {
471 *data++ = ioread32(adapter->hw_addr +
472 REG_QMU_DATA_LO);
473 len -= sizeof(u32);
474 }
\9aöjfors, 2009-06-04 03:35:55 +0000">b07878e5 475 }
\9aöjfors, 2009-06-04 03:35:55 +0000" rowspan="5">b07878e5
R		 476 skb->protocol = eth_type_trans(skb, netdev);
477 netif_rx(skb);
478 } else
479 netdev->stats.rx_dropped++;
480 } else {
a99db196 481 netdev_dbg(netdev, "RX error, status: %x\n", status);
\9aöjfors, 2009-06-04 03:35:55 +0000" rowspan="22">b07878e5
R		 482 netdev->stats.rx_errors++;
483 if (status & RXSR_TOO_LONG)
484 netdev->stats.rx_length_errors++;
485 if (status & RXSR_CRC_ERROR)
486 netdev->stats.rx_crc_errors++;
487 if (status & RXSR_RUNT)
488 netdev->stats.rx_frame_errors++;
489 }
490
491 /* set high watermark to 3K */
492 ks8842_clear_bits(adapter, 0, 1 << 12, REG_QRFCR);
493
494 /* release the frame */
495 ks8842_write16(adapter, 17, 0x01, REG_RXQCR);
496
497 /* set high watermark to 2K */
498 ks8842_enable_bits(adapter, 0, 1 << 12, REG_QRFCR);
499}
500
501void ks8842_handle_rx(struct net_device *netdev, struct ks8842_adapter *adapter)
502{
503 u16 rx_data = ks8842_read16(adapter, 16, REG_RXMIR) & 0x1fff;
a99db196 504 netdev_dbg(netdev, "%s Entry - rx_data: %d\n", __func__, rx_data);
\9aöjfors, 2009-06-04 03:35:55 +0000" rowspan="9">b07878e5
R		 505 while (rx_data) {
506 ks8842_rx_frame(netdev, adapter);
507 rx_data = ks8842_read16(adapter, 16, REG_RXMIR) & 0x1fff;
508 }
509}
510
511void ks8842_handle_tx(struct net_device *netdev, struct ks8842_adapter *adapter)
512{
513 u16 sr = ks8842_read16(adapter, 16, REG_TXSR);
a99db196 514 netdev_dbg(netdev, "%s - entry, sr: %x\n", __func__, sr);
\9aöjfors, 2009-06-04 03:35:55 +0000" rowspan="8">b07878e5
R		 515 netdev->stats.tx_packets++;
516 if (netif_queue_stopped(netdev))
517 netif_wake_queue(netdev);
518}
519
520void ks8842_handle_rx_overrun(struct net_device *netdev,
521 struct ks8842_adapter *adapter)
522{
a99db196 523 netdev_dbg(netdev, "%s: entry\n", __func__);
\9aöjfors, 2009-06-04 03:35:55 +0000" rowspan="18">b07878e5
R		 524 netdev->stats.rx_errors++;
525 netdev->stats.rx_fifo_errors++;
526}
527
528void ks8842_tasklet(unsigned long arg)
529{
530 struct net_device *netdev = (struct net_device *)arg;
531 struct ks8842_adapter *adapter = netdev_priv(netdev);
532 u16 isr;
533 unsigned long flags;
534 u16 entry_bank;
535
536 /* read current bank to be able to set it back */
537 spin_lock_irqsave(&adapter->lock, flags);
538 entry_bank = ioread16(adapter->hw_addr + REG_SELECT_BANK);
539 spin_unlock_irqrestore(&adapter->lock, flags);
540
541 isr = ks8842_read16(adapter, 18, REG_ISR);
a99db196 542 netdev_dbg(netdev, "%s - ISR: 0x%x\n", __func__, isr);
\9aöjfors, 2009-06-04 03:35:55 +0000" rowspan="4">b07878e5
R		 543
544 /* Ack */
545 ks8842_write16(adapter, 18, isr, REG_ISR);
546
db5824dd
RR		 547 if (!(adapter->conf_flags & MICREL_KS884X))
548 /* Ack in the timberdale IP as well */
549 iowrite32(0x1, adapter->hw_addr + REG_TIMB_IAR);
550
\9aöjfors, 2009-06-04 03:35:55 +0000" rowspan="34">b07878e5
R		 551 if (!netif_running(netdev))
552 return;
553
554 if (isr & IRQ_LINK_CHANGE)
555 ks8842_update_link_status(netdev, adapter);
556
557 if (isr & (IRQ_RX | IRQ_RX_ERROR))
558 ks8842_handle_rx(netdev, adapter);
559
560 if (isr & IRQ_TX)
561 ks8842_handle_tx(netdev, adapter);
562
563 if (isr & IRQ_RX_OVERRUN)
564 ks8842_handle_rx_overrun(netdev, adapter);
565
566 if (isr & IRQ_TX_STOPPED) {
567 ks8842_disable_tx(adapter);
568 ks8842_enable_tx(adapter);
569 }
570
571 if (isr & IRQ_RX_STOPPED) {
572 ks8842_disable_rx(adapter);
573 ks8842_enable_rx(adapter);
574 }
575
576 /* re-enable interrupts, put back the bank selection register */
577 spin_lock_irqsave(&adapter->lock, flags);
578 ks8842_write16(adapter, 18, ENABLED_IRQS, REG_IER);
579 iowrite16(entry_bank, adapter->hw_addr + REG_SELECT_BANK);
580 spin_unlock_irqrestore(&adapter->lock, flags);
581}
582
583static irqreturn_t ks8842_irq(int irq, void *devid)
584{
a99db196
RR		 585 struct net_device *netdev = devid;
586 struct ks8842_adapter *adapter = netdev_priv(netdev);
\9aöjfors, 2009-06-04 03:35:55 +0000" rowspan="5">b07878e5
R		 587 u16 isr;
588 u16 entry_bank = ioread16(adapter->hw_addr + REG_SELECT_BANK);
589 irqreturn_t ret = IRQ_NONE;
590
591 isr = ks8842_read16(adapter, 18, REG_ISR);
a99db196 592 netdev_dbg(netdev, "%s - ISR: 0x%x\n", __func__, isr);
\9aöjfors, 2009-06-04 03:35:55 +0000" rowspan="24">b07878e5
R		 593
594 if (isr) {
595 /* disable IRQ */
596 ks8842_write16(adapter, 18, 0x00, REG_IER);
597
598 /* schedule tasklet */
599 tasklet_schedule(&adapter->tasklet);
600
601 ret = IRQ_HANDLED;
602 }
603
604 iowrite16(entry_bank, adapter->hw_addr + REG_SELECT_BANK);
605
606 return ret;
607}
608
609
610/* Netdevice operations */
611
612static int ks8842_open(struct net_device *netdev)
613{
614 struct ks8842_adapter *adapter = netdev_priv(netdev);
615 int err;
616
a99db196 617 netdev_dbg(netdev, "%s - entry\n", __func__);
\9aöjfors, 2009-06-04 03:35:55 +0000" rowspan="4">b07878e5
R		 618
619 /* reset the HW */
620 ks8842_reset_hw(adapter);
621
a1aa8822
RR		 622 ks8842_write_mac_addr(adapter, netdev->dev_addr);
623
\9aöjfors, 2009-06-04 03:35:55 +0000" rowspan="3">b07878e5
R		 624 ks8842_update_link_status(netdev, adapter);
625
626 err = request_irq(adapter->irq, ks8842_irq, IRQF_SHARED, DRV_NAME,
a99db196 627 netdev);
\9aöjfors, 2009-06-04 03:35:55 +0000">b07878e5 628 if (err) {
0dc7d2b3 629 pr_err("Failed to request IRQ: %d: %d\n", adapter->irq, err);
\9aöjfors, 2009-06-04 03:35:55 +0000" rowspan="10">b07878e5
R		 630 return err;
631 }
632
633 return 0;
634}
635
636static int ks8842_close(struct net_device *netdev)
637{
638 struct ks8842_adapter *adapter = netdev_priv(netdev);
639
a99db196 640 netdev_dbg(netdev, "%s - entry\n", __func__);
\9aöjfors, 2009-06-04 03:35:55 +0000">b07878e5 641
cc88e450
RR		 642 cancel_work_sync(&adapter->timeout_work);
643
\9aöjfors, 2009-06-04 03:35:55 +0000">b07878e5 644 /* free the irq */
a99db196 645 free_irq(adapter->irq, netdev);
\9aöjfors, 2009-06-04 03:35:55 +0000" rowspan="7">b07878e5
R		 646
647 /* disable the switch */
648 ks8842_write16(adapter, 32, 0x0, REG_SW_ID_AND_ENABLE);
649
650 return 0;
651}
652
61357325
SH		 653static netdev_tx_t ks8842_xmit_frame(struct sk_buff *skb,
654 struct net_device *netdev)
\9aöjfors, 2009-06-04 03:35:55 +0000" rowspan="4">b07878e5
R		 655{
656 int ret;
657 struct ks8842_adapter *adapter = netdev_priv(netdev);
658
a99db196 659 netdev_dbg(netdev, "%s: entry\n", __func__);
\9aöjfors, 2009-06-04 03:35:55 +0000" rowspan="12">b07878e5
R		 660
661 ret = ks8842_tx_frame(skb, netdev);
662
663 if (ks8842_tx_fifo_space(adapter) < netdev->mtu + 8)
664 netif_stop_queue(netdev);
665
666 return ret;
667}
668
669static int ks8842_set_mac(struct net_device *netdev, void *p)
670{
671 struct ks8842_adapter *adapter = netdev_priv(netdev);
\9aöjfors, 2009-06-04 03:35:55 +0000" rowspan="2">b07878e5
R		 672 struct sockaddr *addr = p;
673 char *mac = (u8 *)addr->sa_data;
\9aöjfors, 2009-06-04 03:35:55 +0000">b07878e5 674
a99db196 675 netdev_dbg(netdev, "%s: entry\n", __func__);
\9aöjfors, 2009-06-04 03:35:55 +0000" rowspan="6">b07878e5
R		 676
677 if (!is_valid_ether_addr(addr->sa_data))
678 return -EADDRNOTAVAIL;
679
680 memcpy(netdev->dev_addr, mac, netdev->addr_len);
681
a1aa8822 682 ks8842_write_mac_addr(adapter, mac);
\9aöjfors, 2009-06-04 03:35:55 +0000" rowspan="3">b07878e5
R		 683 return 0;
684}
685
cc88e450 686static void ks8842_tx_timeout_work(struct work_struct *work)
\9aöjfors, 2009-06-04 03:35:55 +0000">b07878e5 687{
cc88e450
RR		 688 struct ks8842_adapter *adapter =
689 container_of(work, struct ks8842_adapter, timeout_work);
690 struct net_device *netdev = adapter->netdev;
\9aöjfors, 2009-06-04 03:35:55 +0000" rowspan="2">b07878e5
R		 691 unsigned long flags;
692
a99db196 693 netdev_dbg(netdev, "%s: entry\n", __func__);
\9aöjfors, 2009-06-04 03:35:55 +0000" rowspan="5">b07878e5
R		 694
695 spin_lock_irqsave(&adapter->lock, flags);
696 /* disable interrupts */
697 ks8842_write16(adapter, 18, 0, REG_IER);
698 ks8842_write16(adapter, 18, 0xFFFF, REG_ISR);
cc88e450
RR		 699
700 netif_stop_queue(netdev);
701
\9aöjfors, 2009-06-04 03:35:55 +0000" rowspan="4">b07878e5
R		 702 spin_unlock_irqrestore(&adapter->lock, flags);
703
704 ks8842_reset_hw(adapter);
705
a1aa8822
RR		 706 ks8842_write_mac_addr(adapter, netdev->dev_addr);
707
\9aöjfors, 2009-06-04 03:35:55 +0000" rowspan="3">b07878e5
R		 708 ks8842_update_link_status(netdev, adapter);
709}
710
cc88e450
RR		 711static void ks8842_tx_timeout(struct net_device *netdev)
712{
713 struct ks8842_adapter *adapter = netdev_priv(netdev);
714
715 netdev_dbg(netdev, "%s: entry\n", __func__);
716
717 schedule_work(&adapter->timeout_work);
718}
719
\9aöjfors, 2009-06-04 03:35:55 +0000" rowspan="9">b07878e5
R		 720static const struct net_device_ops ks8842_netdev_ops = {
721 .ndo_open = ks8842_open,
722 .ndo_stop = ks8842_close,
723 .ndo_start_xmit = ks8842_xmit_frame,
724 .ndo_set_mac_address = ks8842_set_mac,
725 .ndo_tx_timeout = ks8842_tx_timeout,
726 .ndo_validate_addr = eth_validate_addr
727};
728
0fc0b732 729static const struct ethtool_ops ks8842_ethtool_ops = {
\9aöjfors, 2009-06-04 03:35:55 +0000" rowspan="9">b07878e5
R		 730 .get_link = ethtool_op_get_link,
731};
732
733static int __devinit ks8842_probe(struct platform_device *pdev)
734{
735 int err = -ENOMEM;
736 struct resource *iomem;
737 struct net_device *netdev;
738 struct ks8842_adapter *adapter;
a1aa8822 739 struct ks8842_platform_data *pdata = pdev->dev.platform_data;
\9aöjfors, 2009-06-04 03:35:55 +0000">b07878e5 740 u16 id;
a1aa8822 741 unsigned i;
\9aöjfors, 2009-06-04 03:35:55 +0000" rowspan="12">b07878e5
R		 742
743 iomem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
744 if (!request_mem_region(iomem->start, resource_size(iomem), DRV_NAME))
745 goto err_mem_region;
746
747 netdev = alloc_etherdev(sizeof(struct ks8842_adapter));
748 if (!netdev)
749 goto err_alloc_etherdev;
750
751 SET_NETDEV_DEV(netdev, &pdev->dev);
752
753 adapter = netdev_priv(netdev);
cc88e450
RR		 754 adapter->netdev = netdev;
755 INIT_WORK(&adapter->timeout_work, ks8842_tx_timeout_work);
\9aöjfors, 2009-06-04 03:35:55 +0000">b07878e5 756 adapter->hw_addr = ioremap(iomem->start, resource_size(iomem));
28bd620c
DC		 757 adapter->conf_flags = iomem->flags;
758
\9aöjfors, 2009-06-04 03:35:55 +0000" rowspan="9">b07878e5
R		 759 if (!adapter->hw_addr)
760 goto err_ioremap;
761
762 adapter->irq = platform_get_irq(pdev, 0);
763 if (adapter->irq < 0) {
764 err = adapter->irq;
765 goto err_get_irq;
766 }
767
\9aöjfors, 2009-06-04 03:35:55 +0000" rowspan="6">b07878e5
R		 768 tasklet_init(&adapter->tasklet, ks8842_tasklet, (unsigned long)netdev);
769 spin_lock_init(&adapter->lock);
770
771 netdev->netdev_ops = &ks8842_netdev_ops;
772 netdev->ethtool_ops = &ks8842_ethtool_ops;
773
a1aa8822
RR		 774 /* Check if a mac address was given */
775 i = netdev->addr_len;
776 if (pdata) {
777 for (i = 0; i < netdev->addr_len; i++)
778 if (pdata->macaddr[i] != 0)
779 break;
780
781 if (i < netdev->addr_len)
782 /* an address was passed, use it */
783 memcpy(netdev->dev_addr, pdata->macaddr,
784 netdev->addr_len);
785 }
786
787 if (i == netdev->addr_len) {
788 ks8842_read_mac_addr(adapter, netdev->dev_addr);
789
790 if (!is_valid_ether_addr(netdev->dev_addr))
791 random_ether_addr(netdev->dev_addr);
792 }
\9aöjfors, 2009-06-04 03:35:55 +0000" rowspan="10">b07878e5
R		 793
794 id = ks8842_read16(adapter, 32, REG_SW_ID_AND_ENABLE);
795
796 strcpy(netdev->name, "eth%d");
797 err = register_netdev(netdev);
798 if (err)
799 goto err_register;
800
801 platform_set_drvdata(pdev, netdev);
802
0dc7d2b3 803 pr_info("Found chip, family: 0x%x, id: 0x%x, rev: 0x%x\n",
\9aöjfors, 2009-06-04 03:35:55 +0000" rowspan="58">b07878e5
R		 804 (id >> 8) & 0xff, (id >> 4) & 0xf, (id >> 1) & 0x7);
805
806 return 0;
807
808err_register:
809err_get_irq:
810 iounmap(adapter->hw_addr);
811err_ioremap:
812 free_netdev(netdev);
813err_alloc_etherdev:
814 release_mem_region(iomem->start, resource_size(iomem));
815err_mem_region:
816 return err;
817}
818
819static int __devexit ks8842_remove(struct platform_device *pdev)
820{
821 struct net_device *netdev = platform_get_drvdata(pdev);
822 struct ks8842_adapter *adapter = netdev_priv(netdev);
823 struct resource *iomem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
824
825 unregister_netdev(netdev);
826 tasklet_kill(&adapter->tasklet);
827 iounmap(adapter->hw_addr);
828 free_netdev(netdev);
829 release_mem_region(iomem->start, resource_size(iomem));
830 platform_set_drvdata(pdev, NULL);
831 return 0;
832}
833
834
835static struct platform_driver ks8842_platform_driver = {
836 .driver = {
837 .name = DRV_NAME,
838 .owner = THIS_MODULE,
839 },
840 .probe = ks8842_probe,
841 .remove = ks8842_remove,
842};
843
844static int __init ks8842_init(void)
845{
846 return platform_driver_register(&ks8842_platform_driver);
847}
848
849static void __exit ks8842_exit(void)
850{
851 platform_driver_unregister(&ks8842_platform_driver);
852}
853
854module_init(ks8842_init);
855module_exit(ks8842_exit);
856
857MODULE_DESCRIPTION("Timberdale KS8842 ethernet driver");
858MODULE_AUTHOR("Mocean Laboratories <info@mocean-labs.com>");
859MODULE_LICENSE("GPL v2");
860MODULE_ALIAS("platform:ks8842");
861
Linux 6.x block layer and io_uring tree(s)