drivers/net: Add Micrel KS8841/42 support to ks8842 driver
[linux-2.6.git] / drivers / net / ks8842.c
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/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>
32 #include <linux/ks8842.h>
33
34 #define DRV_NAME "ks8842"
35
36 /* Timberdale specific Registers */
37 #define REG_TIMB_RST    0x1c
38
39 /* KS8842 registers */
40
41 #define REG_SELECT_BANK 0x0e
42
43 /* bank 0 registers */
44 #define REG_QRFCR       0x04
45
46 /* bank 2 registers */
47 #define REG_MARL        0x00
48 #define REG_MARM        0x02
49 #define REG_MARH        0x04
50
51 /* bank 3 registers */
52 #define REG_GRR         0x06
53
54 /* bank 16 registers */
55 #define REG_TXCR        0x00
56 #define REG_TXSR        0x02
57 #define REG_RXCR        0x04
58 #define REG_TXMIR       0x08
59 #define REG_RXMIR       0x0A
60
61 /* bank 17 registers */
62 #define REG_TXQCR       0x00
63 #define REG_RXQCR       0x02
64 #define REG_TXFDPR      0x04
65 #define REG_RXFDPR      0x06
66 #define REG_QMU_DATA_LO 0x08
67 #define REG_QMU_DATA_HI 0x0A
68
69 /* bank 18 registers */
70 #define REG_IER         0x00
71 #define IRQ_LINK_CHANGE 0x8000
72 #define IRQ_TX          0x4000
73 #define IRQ_RX          0x2000
74 #define IRQ_RX_OVERRUN  0x0800
75 #define IRQ_TX_STOPPED  0x0200
76 #define IRQ_RX_STOPPED  0x0100
77 #define IRQ_RX_ERROR    0x0080
78 #define ENABLED_IRQS    (IRQ_LINK_CHANGE | IRQ_TX | IRQ_RX | IRQ_RX_STOPPED | \
79                 IRQ_TX_STOPPED | IRQ_RX_OVERRUN | IRQ_RX_ERROR)
80 #define REG_ISR         0x02
81 #define REG_RXSR        0x04
82 #define RXSR_VALID      0x8000
83 #define RXSR_BROADCAST  0x80
84 #define RXSR_MULTICAST  0x40
85 #define RXSR_UNICAST    0x20
86 #define RXSR_FRAMETYPE  0x08
87 #define RXSR_TOO_LONG   0x04
88 #define RXSR_RUNT       0x02
89 #define RXSR_CRC_ERROR  0x01
90 #define RXSR_ERROR      (RXSR_TOO_LONG | RXSR_RUNT | RXSR_CRC_ERROR)
91
92 /* bank 32 registers */
93 #define REG_SW_ID_AND_ENABLE    0x00
94 #define REG_SGCR1               0x02
95 #define REG_SGCR2               0x04
96 #define REG_SGCR3               0x06
97
98 /* bank 39 registers */
99 #define REG_MACAR1              0x00
100 #define REG_MACAR2              0x02
101 #define REG_MACAR3              0x04
102
103 /* bank 45 registers */
104 #define REG_P1MBCR              0x00
105 #define REG_P1MBSR              0x02
106
107 /* bank 46 registers */
108 #define REG_P2MBCR              0x00
109 #define REG_P2MBSR              0x02
110
111 /* bank 48 registers */
112 #define REG_P1CR2               0x02
113
114 /* bank 49 registers */
115 #define REG_P1CR4               0x02
116 #define REG_P1SR                0x04
117
118 /* flags passed by platform_device for configuration */
119 #define MICREL_KS884X           0x01    /* 0=Timeberdale(FPGA), 1=Micrel */
120 #define KS884X_16BIT            0x02    /*  1=16bit, 0=32bit */
121
122 struct ks8842_adapter {
123         void __iomem    *hw_addr;
124         int             irq;
125         unsigned long   conf_flags;     /* copy of platform_device config */
126         struct tasklet_struct   tasklet;
127         spinlock_t      lock; /* spinlock to be interrupt safe */
128         struct work_struct timeout_work;
129         struct net_device *netdev;
130 };
131
132 static inline void ks8842_select_bank(struct ks8842_adapter *adapter, u16 bank)
133 {
134         iowrite16(bank, adapter->hw_addr + REG_SELECT_BANK);
135 }
136
137 static inline void ks8842_write8(struct ks8842_adapter *adapter, u16 bank,
138         u8 value, int offset)
139 {
140         ks8842_select_bank(adapter, bank);
141         iowrite8(value, adapter->hw_addr + offset);
142 }
143
144 static inline void ks8842_write16(struct ks8842_adapter *adapter, u16 bank,
145         u16 value, int offset)
146 {
147         ks8842_select_bank(adapter, bank);
148         iowrite16(value, adapter->hw_addr + offset);
149 }
150
151 static inline void ks8842_enable_bits(struct ks8842_adapter *adapter, u16 bank,
152         u16 bits, int offset)
153 {
154         u16 reg;
155         ks8842_select_bank(adapter, bank);
156         reg = ioread16(adapter->hw_addr + offset);
157         reg |= bits;
158         iowrite16(reg, adapter->hw_addr + offset);
159 }
160
161 static inline void ks8842_clear_bits(struct ks8842_adapter *adapter, u16 bank,
162         u16 bits, int offset)
163 {
164         u16 reg;
165         ks8842_select_bank(adapter, bank);
166         reg = ioread16(adapter->hw_addr + offset);
167         reg &= ~bits;
168         iowrite16(reg, adapter->hw_addr + offset);
169 }
170
171 static inline void ks8842_write32(struct ks8842_adapter *adapter, u16 bank,
172         u32 value, int offset)
173 {
174         ks8842_select_bank(adapter, bank);
175         iowrite32(value, adapter->hw_addr + offset);
176 }
177
178 static inline u8 ks8842_read8(struct ks8842_adapter *adapter, u16 bank,
179         int offset)
180 {
181         ks8842_select_bank(adapter, bank);
182         return ioread8(adapter->hw_addr + offset);
183 }
184
185 static inline u16 ks8842_read16(struct ks8842_adapter *adapter, u16 bank,
186         int offset)
187 {
188         ks8842_select_bank(adapter, bank);
189         return ioread16(adapter->hw_addr + offset);
190 }
191
192 static inline u32 ks8842_read32(struct ks8842_adapter *adapter, u16 bank,
193         int offset)
194 {
195         ks8842_select_bank(adapter, bank);
196         return ioread32(adapter->hw_addr + offset);
197 }
198
199 static void ks8842_reset(struct ks8842_adapter *adapter)
200 {
201         if (adapter->conf_flags & MICREL_KS884X) {
202                 ks8842_write16(adapter, 3, 1, REG_GRR);
203                 msleep(10);
204                 iowrite16(0, adapter->hw_addr + REG_GRR);
205         } else {
206                 /* The KS8842 goes haywire when doing softare reset
207                 * a work around in the timberdale IP is implemented to
208                 * do a hardware reset instead
209                 ks8842_write16(adapter, 3, 1, REG_GRR);
210                 msleep(10);
211                 iowrite16(0, adapter->hw_addr + REG_GRR);
212                 */
213                 iowrite32(0x1, adapter->hw_addr + REG_TIMB_RST);
214                 msleep(20);
215         }
216 }
217
218 static void ks8842_update_link_status(struct net_device *netdev,
219         struct ks8842_adapter *adapter)
220 {
221         /* check the status of the link */
222         if (ks8842_read16(adapter, 45, REG_P1MBSR) & 0x4) {
223                 netif_carrier_on(netdev);
224                 netif_wake_queue(netdev);
225         } else {
226                 netif_stop_queue(netdev);
227                 netif_carrier_off(netdev);
228         }
229 }
230
231 static void ks8842_enable_tx(struct ks8842_adapter *adapter)
232 {
233         ks8842_enable_bits(adapter, 16, 0x01, REG_TXCR);
234 }
235
236 static void ks8842_disable_tx(struct ks8842_adapter *adapter)
237 {
238         ks8842_clear_bits(adapter, 16, 0x01, REG_TXCR);
239 }
240
241 static void ks8842_enable_rx(struct ks8842_adapter *adapter)
242 {
243         ks8842_enable_bits(adapter, 16, 0x01, REG_RXCR);
244 }
245
246 static void ks8842_disable_rx(struct ks8842_adapter *adapter)
247 {
248         ks8842_clear_bits(adapter, 16, 0x01, REG_RXCR);
249 }
250
251 static void ks8842_reset_hw(struct ks8842_adapter *adapter)
252 {
253         /* reset the HW */
254         ks8842_reset(adapter);
255
256         /* Enable QMU Transmit flow control / transmit padding / Transmit CRC */
257         ks8842_write16(adapter, 16, 0x000E, REG_TXCR);
258
259         /* enable the receiver, uni + multi + broadcast + flow ctrl
260                 + crc strip */
261         ks8842_write16(adapter, 16, 0x8 | 0x20 | 0x40 | 0x80 | 0x400,
262                 REG_RXCR);
263
264         /* TX frame pointer autoincrement */
265         ks8842_write16(adapter, 17, 0x4000, REG_TXFDPR);
266
267         /* RX frame pointer autoincrement */
268         ks8842_write16(adapter, 17, 0x4000, REG_RXFDPR);
269
270         /* RX 2 kb high watermark */
271         ks8842_write16(adapter, 0, 0x1000, REG_QRFCR);
272
273         /* aggresive back off in half duplex */
274         ks8842_enable_bits(adapter, 32, 1 << 8, REG_SGCR1);
275
276         /* enable no excessive collison drop */
277         ks8842_enable_bits(adapter, 32, 1 << 3, REG_SGCR2);
278
279         /* Enable port 1 force flow control / back pressure / transmit / recv */
280         ks8842_write16(adapter, 48, 0x1E07, REG_P1CR2);
281
282         /* restart port auto-negotiation */
283         ks8842_enable_bits(adapter, 49, 1 << 13, REG_P1CR4);
284
285         if (!(adapter->conf_flags & MICREL_KS884X))
286                 /* only advertise 10Mbps */
287                 ks8842_clear_bits(adapter, 49, 3 << 2, REG_P1CR4);
288
289         /* Enable the transmitter */
290         ks8842_enable_tx(adapter);
291
292         /* Enable the receiver */
293         ks8842_enable_rx(adapter);
294
295         /* clear all interrupts */
296         ks8842_write16(adapter, 18, 0xffff, REG_ISR);
297
298         /* enable interrupts */
299         ks8842_write16(adapter, 18, ENABLED_IRQS, REG_IER);
300
301         /* enable the switch */
302         ks8842_write16(adapter, 32, 0x1, REG_SW_ID_AND_ENABLE);
303 }
304
305 static void ks8842_read_mac_addr(struct ks8842_adapter *adapter, u8 *dest)
306 {
307         int i;
308         u16 mac;
309
310         for (i = 0; i < ETH_ALEN; i++)
311                 dest[ETH_ALEN - i - 1] = ks8842_read8(adapter, 2, REG_MARL + i);
312
313         if (adapter->conf_flags & MICREL_KS884X) {
314                 /*
315                 the sequence of saving mac addr between MAC and Switch is
316                 different.
317                 */
318
319                 mac = ks8842_read16(adapter, 2, REG_MARL);
320                 ks8842_write16(adapter, 39, mac, REG_MACAR3);
321                 mac = ks8842_read16(adapter, 2, REG_MARM);
322                 ks8842_write16(adapter, 39, mac, REG_MACAR2);
323                 mac = ks8842_read16(adapter, 2, REG_MARH);
324                 ks8842_write16(adapter, 39, mac, REG_MACAR1);
325         } else {
326
327                 /* make sure the switch port uses the same MAC as the QMU */
328                 mac = ks8842_read16(adapter, 2, REG_MARL);
329                 ks8842_write16(adapter, 39, mac, REG_MACAR1);
330                 mac = ks8842_read16(adapter, 2, REG_MARM);
331                 ks8842_write16(adapter, 39, mac, REG_MACAR2);
332                 mac = ks8842_read16(adapter, 2, REG_MARH);
333                 ks8842_write16(adapter, 39, mac, REG_MACAR3);
334         }
335 }
336
337 static void ks8842_write_mac_addr(struct ks8842_adapter *adapter, u8 *mac)
338 {
339         unsigned long flags;
340         unsigned i;
341
342         spin_lock_irqsave(&adapter->lock, flags);
343         for (i = 0; i < ETH_ALEN; i++) {
344                 ks8842_write8(adapter, 2, mac[ETH_ALEN - i - 1], REG_MARL + i);
345                 if (!(adapter->conf_flags & MICREL_KS884X))
346                         ks8842_write8(adapter, 39, mac[ETH_ALEN - i - 1],
347                                 REG_MACAR1 + i);
348         }
349
350         if (adapter->conf_flags & MICREL_KS884X) {
351                 /*
352                 the sequence of saving mac addr between MAC and Switch is
353                 different.
354                 */
355
356                 u16 mac;
357
358                 mac = ks8842_read16(adapter, 2, REG_MARL);
359                 ks8842_write16(adapter, 39, mac, REG_MACAR3);
360                 mac = ks8842_read16(adapter, 2, REG_MARM);
361                 ks8842_write16(adapter, 39, mac, REG_MACAR2);
362                 mac = ks8842_read16(adapter, 2, REG_MARH);
363                 ks8842_write16(adapter, 39, mac, REG_MACAR1);
364         }
365         spin_unlock_irqrestore(&adapter->lock, flags);
366 }
367
368 static inline u16 ks8842_tx_fifo_space(struct ks8842_adapter *adapter)
369 {
370         return ks8842_read16(adapter, 16, REG_TXMIR) & 0x1fff;
371 }
372
373 static int ks8842_tx_frame(struct sk_buff *skb, struct net_device *netdev)
374 {
375         struct ks8842_adapter *adapter = netdev_priv(netdev);
376         int len = skb->len;
377
378         netdev_dbg(netdev, "%s: len %u head %p data %p tail %p end %p\n",
379                 __func__, skb->len, skb->head, skb->data,
380                 skb_tail_pointer(skb), skb_end_pointer(skb));
381
382         /* check FIFO buffer space, we need space for CRC and command bits */
383         if (ks8842_tx_fifo_space(adapter) < len + 8)
384                 return NETDEV_TX_BUSY;
385
386         if (adapter->conf_flags & KS884X_16BIT) {
387                 u16 *ptr16 = (u16 *)skb->data;
388                 ks8842_write16(adapter, 17, 0x8000 | 0x100, REG_QMU_DATA_LO);
389                 ks8842_write16(adapter, 17, (u16)len, REG_QMU_DATA_HI);
390                 netdev->stats.tx_bytes += len;
391
392                 /* copy buffer */
393                 while (len > 0) {
394                         iowrite16(*ptr16++, adapter->hw_addr + REG_QMU_DATA_LO);
395                         iowrite16(*ptr16++, adapter->hw_addr + REG_QMU_DATA_HI);
396                         len -= sizeof(u32);
397                 }
398         } else {
399
400                 u32 *ptr = (u32 *)skb->data;
401                 u32 ctrl;
402                 /* the control word, enable IRQ, port 1 and the length */
403                 ctrl = 0x8000 | 0x100 | (len << 16);
404                 ks8842_write32(adapter, 17, ctrl, REG_QMU_DATA_LO);
405
406                 netdev->stats.tx_bytes += len;
407
408                 /* copy buffer */
409                 while (len > 0) {
410                         iowrite32(*ptr, adapter->hw_addr + REG_QMU_DATA_LO);
411                         len -= sizeof(u32);
412                         ptr++;
413                 }
414         }
415
416         /* enqueue packet */
417         ks8842_write16(adapter, 17, 1, REG_TXQCR);
418
419         dev_kfree_skb(skb);
420
421         return NETDEV_TX_OK;
422 }
423
424 static void ks8842_rx_frame(struct net_device *netdev,
425         struct ks8842_adapter *adapter)
426 {
427         u16 status16;
428         u32 status;
429         int len;
430
431         if (adapter->conf_flags & KS884X_16BIT) {
432                 status16 = ks8842_read16(adapter, 17, REG_QMU_DATA_LO);
433                 len  = (int)ks8842_read16(adapter, 17, REG_QMU_DATA_HI);
434                 len &= 0xffff;
435                 netdev_dbg(netdev, "%s - rx_data: status: %x\n",
436                            __func__, status16);
437         } else {
438                 status = ks8842_read32(adapter, 17, REG_QMU_DATA_LO);
439                 len = (status >> 16) & 0x7ff;
440                 status &= 0xffff;
441                 netdev_dbg(netdev, "%s - rx_data: status: %x\n",
442                            __func__, status);
443         }
444
445         /* check the status */
446         if ((status & RXSR_VALID) && !(status & RXSR_ERROR)) {
447                 struct sk_buff *skb = netdev_alloc_skb_ip_align(netdev, len);
448
449                 netdev_dbg(netdev, "%s, got package, len: %d\n", __func__, len);
450                 if (skb) {
451
452                         netdev->stats.rx_packets++;
453                         netdev->stats.rx_bytes += len;
454                         if (status & RXSR_MULTICAST)
455                                 netdev->stats.multicast++;
456
457                         if (adapter->conf_flags & KS884X_16BIT) {
458                                 u16 *data16 = (u16 *)skb_put(skb, len);
459                                 ks8842_select_bank(adapter, 17);
460                                 while (len > 0) {
461                                         *data16++ = ioread16(adapter->hw_addr +
462                                                 REG_QMU_DATA_LO);
463                                         *data16++ = ioread16(adapter->hw_addr +
464                                                 REG_QMU_DATA_HI);
465                                         len -= sizeof(u32);
466                                 }
467                         } else {
468                                 u32 *data = (u32 *)skb_put(skb, len);
469
470                                 ks8842_select_bank(adapter, 17);
471                                 while (len > 0) {
472                                         *data++ = ioread32(adapter->hw_addr +
473                                                 REG_QMU_DATA_LO);
474                                         len -= sizeof(u32);
475                                 }
476                         }
477                         skb->protocol = eth_type_trans(skb, netdev);
478                         netif_rx(skb);
479                 } else
480                         netdev->stats.rx_dropped++;
481         } else {
482                 netdev_dbg(netdev, "RX error, status: %x\n", status);
483                 netdev->stats.rx_errors++;
484                 if (status & RXSR_TOO_LONG)
485                         netdev->stats.rx_length_errors++;
486                 if (status & RXSR_CRC_ERROR)
487                         netdev->stats.rx_crc_errors++;
488                 if (status & RXSR_RUNT)
489                         netdev->stats.rx_frame_errors++;
490         }
491
492         /* set high watermark to 3K */
493         ks8842_clear_bits(adapter, 0, 1 << 12, REG_QRFCR);
494
495         /* release the frame */
496         ks8842_write16(adapter, 17, 0x01, REG_RXQCR);
497
498         /* set high watermark to 2K */
499         ks8842_enable_bits(adapter, 0, 1 << 12, REG_QRFCR);
500 }
501
502 void ks8842_handle_rx(struct net_device *netdev, struct ks8842_adapter *adapter)
503 {
504         u16 rx_data = ks8842_read16(adapter, 16, REG_RXMIR) & 0x1fff;
505         netdev_dbg(netdev, "%s Entry - rx_data: %d\n", __func__, rx_data);
506         while (rx_data) {
507                 ks8842_rx_frame(netdev, adapter);
508                 rx_data = ks8842_read16(adapter, 16, REG_RXMIR) & 0x1fff;
509         }
510 }
511
512 void ks8842_handle_tx(struct net_device *netdev, struct ks8842_adapter *adapter)
513 {
514         u16 sr = ks8842_read16(adapter, 16, REG_TXSR);
515         netdev_dbg(netdev, "%s - entry, sr: %x\n", __func__, sr);
516         netdev->stats.tx_packets++;
517         if (netif_queue_stopped(netdev))
518                 netif_wake_queue(netdev);
519 }
520
521 void ks8842_handle_rx_overrun(struct net_device *netdev,
522         struct ks8842_adapter *adapter)
523 {
524         netdev_dbg(netdev, "%s: entry\n", __func__);
525         netdev->stats.rx_errors++;
526         netdev->stats.rx_fifo_errors++;
527 }
528
529 void ks8842_tasklet(unsigned long arg)
530 {
531         struct net_device *netdev = (struct net_device *)arg;
532         struct ks8842_adapter *adapter = netdev_priv(netdev);
533         u16 isr;
534         unsigned long flags;
535         u16 entry_bank;
536
537         /* read current bank to be able to set it back */
538         spin_lock_irqsave(&adapter->lock, flags);
539         entry_bank = ioread16(adapter->hw_addr + REG_SELECT_BANK);
540         spin_unlock_irqrestore(&adapter->lock, flags);
541
542         isr = ks8842_read16(adapter, 18, REG_ISR);
543         netdev_dbg(netdev, "%s - ISR: 0x%x\n", __func__, isr);
544
545         /* Ack */
546         ks8842_write16(adapter, 18, isr, REG_ISR);
547
548         if (!netif_running(netdev))
549                 return;
550
551         if (isr & IRQ_LINK_CHANGE)
552                 ks8842_update_link_status(netdev, adapter);
553
554         if (isr & (IRQ_RX | IRQ_RX_ERROR))
555                 ks8842_handle_rx(netdev, adapter);
556
557         if (isr & IRQ_TX)
558                 ks8842_handle_tx(netdev, adapter);
559
560         if (isr & IRQ_RX_OVERRUN)
561                 ks8842_handle_rx_overrun(netdev, adapter);
562
563         if (isr & IRQ_TX_STOPPED) {
564                 ks8842_disable_tx(adapter);
565                 ks8842_enable_tx(adapter);
566         }
567
568         if (isr & IRQ_RX_STOPPED) {
569                 ks8842_disable_rx(adapter);
570                 ks8842_enable_rx(adapter);
571         }
572
573         /* re-enable interrupts, put back the bank selection register */
574         spin_lock_irqsave(&adapter->lock, flags);
575         ks8842_write16(adapter, 18, ENABLED_IRQS, REG_IER);
576         iowrite16(entry_bank, adapter->hw_addr + REG_SELECT_BANK);
577         spin_unlock_irqrestore(&adapter->lock, flags);
578 }
579
580 static irqreturn_t ks8842_irq(int irq, void *devid)
581 {
582         struct net_device *netdev = devid;
583         struct ks8842_adapter *adapter = netdev_priv(netdev);
584         u16 isr;
585         u16 entry_bank = ioread16(adapter->hw_addr + REG_SELECT_BANK);
586         irqreturn_t ret = IRQ_NONE;
587
588         isr = ks8842_read16(adapter, 18, REG_ISR);
589         netdev_dbg(netdev, "%s - ISR: 0x%x\n", __func__, isr);
590
591         if (isr) {
592                 /* disable IRQ */
593                 ks8842_write16(adapter, 18, 0x00, REG_IER);
594
595                 /* schedule tasklet */
596                 tasklet_schedule(&adapter->tasklet);
597
598                 ret = IRQ_HANDLED;
599         }
600
601         iowrite16(entry_bank, adapter->hw_addr + REG_SELECT_BANK);
602
603         return ret;
604 }
605
606
607 /* Netdevice operations */
608
609 static int ks8842_open(struct net_device *netdev)
610 {
611         struct ks8842_adapter *adapter = netdev_priv(netdev);
612         int err;
613
614         netdev_dbg(netdev, "%s - entry\n", __func__);
615
616         /* reset the HW */
617         ks8842_reset_hw(adapter);
618
619         ks8842_write_mac_addr(adapter, netdev->dev_addr);
620
621         ks8842_update_link_status(netdev, adapter);
622
623         err = request_irq(adapter->irq, ks8842_irq, IRQF_SHARED, DRV_NAME,
624                 netdev);
625         if (err) {
626                 pr_err("Failed to request IRQ: %d: %d\n", adapter->irq, err);
627                 return err;
628         }
629
630         return 0;
631 }
632
633 static int ks8842_close(struct net_device *netdev)
634 {
635         struct ks8842_adapter *adapter = netdev_priv(netdev);
636
637         netdev_dbg(netdev, "%s - entry\n", __func__);
638
639         cancel_work_sync(&adapter->timeout_work);
640
641         /* free the irq */
642         free_irq(adapter->irq, netdev);
643
644         /* disable the switch */
645         ks8842_write16(adapter, 32, 0x0, REG_SW_ID_AND_ENABLE);
646
647         return 0;
648 }
649
650 static netdev_tx_t ks8842_xmit_frame(struct sk_buff *skb,
651                                      struct net_device *netdev)
652 {
653         int ret;
654         struct ks8842_adapter *adapter = netdev_priv(netdev);
655
656         netdev_dbg(netdev, "%s: entry\n", __func__);
657
658         ret = ks8842_tx_frame(skb, netdev);
659
660         if (ks8842_tx_fifo_space(adapter) <  netdev->mtu + 8)
661                 netif_stop_queue(netdev);
662
663         return ret;
664 }
665
666 static int ks8842_set_mac(struct net_device *netdev, void *p)
667 {
668         struct ks8842_adapter *adapter = netdev_priv(netdev);
669         struct sockaddr *addr = p;
670         char *mac = (u8 *)addr->sa_data;
671
672         netdev_dbg(netdev, "%s: entry\n", __func__);
673
674         if (!is_valid_ether_addr(addr->sa_data))
675                 return -EADDRNOTAVAIL;
676
677         memcpy(netdev->dev_addr, mac, netdev->addr_len);
678
679         ks8842_write_mac_addr(adapter, mac);
680         return 0;
681 }
682
683 static void ks8842_tx_timeout_work(struct work_struct *work)
684 {
685         struct ks8842_adapter *adapter =
686                 container_of(work, struct ks8842_adapter, timeout_work);
687         struct net_device *netdev = adapter->netdev;
688         unsigned long flags;
689
690         netdev_dbg(netdev, "%s: entry\n", __func__);
691
692         spin_lock_irqsave(&adapter->lock, flags);
693         /* disable interrupts */
694         ks8842_write16(adapter, 18, 0, REG_IER);
695         ks8842_write16(adapter, 18, 0xFFFF, REG_ISR);
696
697         netif_stop_queue(netdev);
698
699         spin_unlock_irqrestore(&adapter->lock, flags);
700
701         ks8842_reset_hw(adapter);
702
703         ks8842_write_mac_addr(adapter, netdev->dev_addr);
704
705         ks8842_update_link_status(netdev, adapter);
706 }
707
708 static void ks8842_tx_timeout(struct net_device *netdev)
709 {
710         struct ks8842_adapter *adapter = netdev_priv(netdev);
711
712         netdev_dbg(netdev, "%s: entry\n", __func__);
713
714         schedule_work(&adapter->timeout_work);
715 }
716
717 static const struct net_device_ops ks8842_netdev_ops = {
718         .ndo_open               = ks8842_open,
719         .ndo_stop               = ks8842_close,
720         .ndo_start_xmit         = ks8842_xmit_frame,
721         .ndo_set_mac_address    = ks8842_set_mac,
722         .ndo_tx_timeout         = ks8842_tx_timeout,
723         .ndo_validate_addr      = eth_validate_addr
724 };
725
726 static const struct ethtool_ops ks8842_ethtool_ops = {
727         .get_link               = ethtool_op_get_link,
728 };
729
730 static int __devinit ks8842_probe(struct platform_device *pdev)
731 {
732         int err = -ENOMEM;
733         struct resource *iomem;
734         struct net_device *netdev;
735         struct ks8842_adapter *adapter;
736         struct ks8842_platform_data *pdata = pdev->dev.platform_data;
737         u16 id;
738         unsigned i;
739
740         iomem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
741         if (!request_mem_region(iomem->start, resource_size(iomem), DRV_NAME))
742                 goto err_mem_region;
743
744         netdev = alloc_etherdev(sizeof(struct ks8842_adapter));
745         if (!netdev)
746                 goto err_alloc_etherdev;
747
748         SET_NETDEV_DEV(netdev, &pdev->dev);
749
750         adapter = netdev_priv(netdev);
751         adapter->netdev = netdev;
752         INIT_WORK(&adapter->timeout_work, ks8842_tx_timeout_work);
753         adapter->hw_addr = ioremap(iomem->start, resource_size(iomem));
754         adapter->conf_flags = iomem->flags;
755
756         if (!adapter->hw_addr)
757                 goto err_ioremap;
758
759         adapter->irq = platform_get_irq(pdev, 0);
760         if (adapter->irq < 0) {
761                 err = adapter->irq;
762                 goto err_get_irq;
763         }
764
765         tasklet_init(&adapter->tasklet, ks8842_tasklet, (unsigned long)netdev);
766         spin_lock_init(&adapter->lock);
767
768         netdev->netdev_ops = &ks8842_netdev_ops;
769         netdev->ethtool_ops = &ks8842_ethtool_ops;
770
771         /* Check if a mac address was given */
772         i = netdev->addr_len;
773         if (pdata) {
774                 for (i = 0; i < netdev->addr_len; i++)
775                         if (pdata->macaddr[i] != 0)
776                                 break;
777
778                 if (i < netdev->addr_len)
779                         /* an address was passed, use it */
780                         memcpy(netdev->dev_addr, pdata->macaddr,
781                                 netdev->addr_len);
782         }
783
784         if (i == netdev->addr_len) {
785                 ks8842_read_mac_addr(adapter, netdev->dev_addr);
786
787                 if (!is_valid_ether_addr(netdev->dev_addr))
788                         random_ether_addr(netdev->dev_addr);
789         }
790
791         id = ks8842_read16(adapter, 32, REG_SW_ID_AND_ENABLE);
792
793         strcpy(netdev->name, "eth%d");
794         err = register_netdev(netdev);
795         if (err)
796                 goto err_register;
797
798         platform_set_drvdata(pdev, netdev);
799
800         pr_info("Found chip, family: 0x%x, id: 0x%x, rev: 0x%x\n",
801                 (id >> 8) & 0xff, (id >> 4) & 0xf, (id >> 1) & 0x7);
802
803         return 0;
804
805 err_register:
806 err_get_irq:
807         iounmap(adapter->hw_addr);
808 err_ioremap:
809         free_netdev(netdev);
810 err_alloc_etherdev:
811         release_mem_region(iomem->start, resource_size(iomem));
812 err_mem_region:
813         return err;
814 }
815
816 static int __devexit ks8842_remove(struct platform_device *pdev)
817 {
818         struct net_device *netdev = platform_get_drvdata(pdev);
819         struct ks8842_adapter *adapter = netdev_priv(netdev);
820         struct resource *iomem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
821
822         unregister_netdev(netdev);
823         tasklet_kill(&adapter->tasklet);
824         iounmap(adapter->hw_addr);
825         free_netdev(netdev);
826         release_mem_region(iomem->start, resource_size(iomem));
827         platform_set_drvdata(pdev, NULL);
828         return 0;
829 }
830
831
832 static struct platform_driver ks8842_platform_driver = {
833         .driver = {
834                 .name   = DRV_NAME,
835                 .owner  = THIS_MODULE,
836         },
837         .probe          = ks8842_probe,
838         .remove         = ks8842_remove,
839 };
840
841 static int __init ks8842_init(void)
842 {
843         return platform_driver_register(&ks8842_platform_driver);
844 }
845
846 static void __exit ks8842_exit(void)
847 {
848         platform_driver_unregister(&ks8842_platform_driver);
849 }
850
851 module_init(ks8842_init);
852 module_exit(ks8842_exit);
853
854 MODULE_DESCRIPTION("Timberdale KS8842 ethernet driver");
855 MODULE_AUTHOR("Mocean Laboratories <info@mocean-labs.com>");
856 MODULE_LICENSE("GPL v2");
857 MODULE_ALIAS("platform:ks8842");
858