Version:  2.0.40 2.2.26 2.4.37 3.0 3.1 3.2 3.3 3.4 3.5 3.6 3.7 3.8 3.9 3.10 3.11 3.12 3.13 3.14 3.15 3.16

Linux/drivers/net/ethernet/micrel/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/interrupt.h>
 27 #include <linux/kernel.h>
 28 #include <linux/module.h>
 29 #include <linux/platform_device.h>
 30 #include <linux/netdevice.h>
 31 #include <linux/etherdevice.h>
 32 #include <linux/ethtool.h>
 33 #include <linux/ks8842.h>
 34 #include <linux/dmaengine.h>
 35 #include <linux/dma-mapping.h>
 36 #include <linux/scatterlist.h>
 37 
 38 #define DRV_NAME "ks8842"
 39 
 40 /* Timberdale specific Registers */
 41 #define REG_TIMB_RST            0x1c
 42 #define REG_TIMB_FIFO           0x20
 43 #define REG_TIMB_ISR            0x24
 44 #define REG_TIMB_IER            0x28
 45 #define REG_TIMB_IAR            0x2C
 46 #define REQ_TIMB_DMA_RESUME     0x30
 47 
 48 /* KS8842 registers */
 49 
 50 #define REG_SELECT_BANK 0x0e
 51 
 52 /* bank 0 registers */
 53 #define REG_QRFCR       0x04
 54 
 55 /* bank 2 registers */
 56 #define REG_MARL        0x00
 57 #define REG_MARM        0x02
 58 #define REG_MARH        0x04
 59 
 60 /* bank 3 registers */
 61 #define REG_GRR         0x06
 62 
 63 /* bank 16 registers */
 64 #define REG_TXCR        0x00
 65 #define REG_TXSR        0x02
 66 #define REG_RXCR        0x04
 67 #define REG_TXMIR       0x08
 68 #define REG_RXMIR       0x0A
 69 
 70 /* bank 17 registers */
 71 #define REG_TXQCR       0x00
 72 #define REG_RXQCR       0x02
 73 #define REG_TXFDPR      0x04
 74 #define REG_RXFDPR      0x06
 75 #define REG_QMU_DATA_LO 0x08
 76 #define REG_QMU_DATA_HI 0x0A
 77 
 78 /* bank 18 registers */
 79 #define REG_IER         0x00
 80 #define IRQ_LINK_CHANGE 0x8000
 81 #define IRQ_TX          0x4000
 82 #define IRQ_RX          0x2000
 83 #define IRQ_RX_OVERRUN  0x0800
 84 #define IRQ_TX_STOPPED  0x0200
 85 #define IRQ_RX_STOPPED  0x0100
 86 #define IRQ_RX_ERROR    0x0080
 87 #define ENABLED_IRQS    (IRQ_LINK_CHANGE | IRQ_TX | IRQ_RX | IRQ_RX_STOPPED | \
 88                 IRQ_TX_STOPPED | IRQ_RX_OVERRUN | IRQ_RX_ERROR)
 89 /* When running via timberdale in DMA mode, the RX interrupt should be
 90    enabled in the KS8842, but not in the FPGA IP, since the IP handles
 91    RX DMA internally.
 92    TX interrupts are not needed it is handled by the FPGA the driver is
 93    notified via DMA callbacks.
 94 */
 95 #define ENABLED_IRQS_DMA_IP     (IRQ_LINK_CHANGE | IRQ_RX_STOPPED | \
 96         IRQ_TX_STOPPED | IRQ_RX_OVERRUN | IRQ_RX_ERROR)
 97 #define ENABLED_IRQS_DMA        (ENABLED_IRQS_DMA_IP | IRQ_RX)
 98 #define REG_ISR         0x02
 99 #define REG_RXSR        0x04
100 #define RXSR_VALID      0x8000
101 #define RXSR_BROADCAST  0x80
102 #define RXSR_MULTICAST  0x40
103 #define RXSR_UNICAST    0x20
104 #define RXSR_FRAMETYPE  0x08
105 #define RXSR_TOO_LONG   0x04
106 #define RXSR_RUNT       0x02
107 #define RXSR_CRC_ERROR  0x01
108 #define RXSR_ERROR      (RXSR_TOO_LONG | RXSR_RUNT | RXSR_CRC_ERROR)
109 
110 /* bank 32 registers */
111 #define REG_SW_ID_AND_ENABLE    0x00
112 #define REG_SGCR1               0x02
113 #define REG_SGCR2               0x04
114 #define REG_SGCR3               0x06
115 
116 /* bank 39 registers */
117 #define REG_MACAR1              0x00
118 #define REG_MACAR2              0x02
119 #define REG_MACAR3              0x04
120 
121 /* bank 45 registers */
122 #define REG_P1MBCR              0x00
123 #define REG_P1MBSR              0x02
124 
125 /* bank 46 registers */
126 #define REG_P2MBCR              0x00
127 #define REG_P2MBSR              0x02
128 
129 /* bank 48 registers */
130 #define REG_P1CR2               0x02
131 
132 /* bank 49 registers */
133 #define REG_P1CR4               0x02
134 #define REG_P1SR                0x04
135 
136 /* flags passed by platform_device for configuration */
137 #define MICREL_KS884X           0x01    /* 0=Timeberdale(FPGA), 1=Micrel */
138 #define KS884X_16BIT            0x02    /*  1=16bit, 0=32bit */
139 
140 #define DMA_BUFFER_SIZE         2048
141 
142 struct ks8842_tx_dma_ctl {
143         struct dma_chan *chan;
144         struct dma_async_tx_descriptor *adesc;
145         void *buf;
146         struct scatterlist sg;
147         int channel;
148 };
149 
150 struct ks8842_rx_dma_ctl {
151         struct dma_chan *chan;
152         struct dma_async_tx_descriptor *adesc;
153         struct sk_buff  *skb;
154         struct scatterlist sg;
155         struct tasklet_struct tasklet;
156         int channel;
157 };
158 
159 #define KS8842_USE_DMA(adapter) (((adapter)->dma_tx.channel != -1) && \
160          ((adapter)->dma_rx.channel != -1))
161 
162 struct ks8842_adapter {
163         void __iomem    *hw_addr;
164         int             irq;
165         unsigned long   conf_flags;     /* copy of platform_device config */
166         struct tasklet_struct   tasklet;
167         spinlock_t      lock; /* spinlock to be interrupt safe */
168         struct work_struct timeout_work;
169         struct net_device *netdev;
170         struct device *dev;
171         struct ks8842_tx_dma_ctl        dma_tx;
172         struct ks8842_rx_dma_ctl        dma_rx;
173 };
174 
175 static void ks8842_dma_rx_cb(void *data);
176 static void ks8842_dma_tx_cb(void *data);
177 
178 static inline void ks8842_resume_dma(struct ks8842_adapter *adapter)
179 {
180         iowrite32(1, adapter->hw_addr + REQ_TIMB_DMA_RESUME);
181 }
182 
183 static inline void ks8842_select_bank(struct ks8842_adapter *adapter, u16 bank)
184 {
185         iowrite16(bank, adapter->hw_addr + REG_SELECT_BANK);
186 }
187 
188 static inline void ks8842_write8(struct ks8842_adapter *adapter, u16 bank,
189         u8 value, int offset)
190 {
191         ks8842_select_bank(adapter, bank);
192         iowrite8(value, adapter->hw_addr + offset);
193 }
194 
195 static inline void ks8842_write16(struct ks8842_adapter *adapter, u16 bank,
196         u16 value, int offset)
197 {
198         ks8842_select_bank(adapter, bank);
199         iowrite16(value, adapter->hw_addr + offset);
200 }
201 
202 static inline void ks8842_enable_bits(struct ks8842_adapter *adapter, u16 bank,
203         u16 bits, int offset)
204 {
205         u16 reg;
206         ks8842_select_bank(adapter, bank);
207         reg = ioread16(adapter->hw_addr + offset);
208         reg |= bits;
209         iowrite16(reg, adapter->hw_addr + offset);
210 }
211 
212 static inline void ks8842_clear_bits(struct ks8842_adapter *adapter, u16 bank,
213         u16 bits, int offset)
214 {
215         u16 reg;
216         ks8842_select_bank(adapter, bank);
217         reg = ioread16(adapter->hw_addr + offset);
218         reg &= ~bits;
219         iowrite16(reg, adapter->hw_addr + offset);
220 }
221 
222 static inline void ks8842_write32(struct ks8842_adapter *adapter, u16 bank,
223         u32 value, int offset)
224 {
225         ks8842_select_bank(adapter, bank);
226         iowrite32(value, adapter->hw_addr + offset);
227 }
228 
229 static inline u8 ks8842_read8(struct ks8842_adapter *adapter, u16 bank,
230         int offset)
231 {
232         ks8842_select_bank(adapter, bank);
233         return ioread8(adapter->hw_addr + offset);
234 }
235 
236 static inline u16 ks8842_read16(struct ks8842_adapter *adapter, u16 bank,
237         int offset)
238 {
239         ks8842_select_bank(adapter, bank);
240         return ioread16(adapter->hw_addr + offset);
241 }
242 
243 static inline u32 ks8842_read32(struct ks8842_adapter *adapter, u16 bank,
244         int offset)
245 {
246         ks8842_select_bank(adapter, bank);
247         return ioread32(adapter->hw_addr + offset);
248 }
249 
250 static void ks8842_reset(struct ks8842_adapter *adapter)
251 {
252         if (adapter->conf_flags & MICREL_KS884X) {
253                 ks8842_write16(adapter, 3, 1, REG_GRR);
254                 msleep(10);
255                 iowrite16(0, adapter->hw_addr + REG_GRR);
256         } else {
257                 /* The KS8842 goes haywire when doing softare reset
258                 * a work around in the timberdale IP is implemented to
259                 * do a hardware reset instead
260                 ks8842_write16(adapter, 3, 1, REG_GRR);
261                 msleep(10);
262                 iowrite16(0, adapter->hw_addr + REG_GRR);
263                 */
264                 iowrite32(0x1, adapter->hw_addr + REG_TIMB_RST);
265                 msleep(20);
266         }
267 }
268 
269 static void ks8842_update_link_status(struct net_device *netdev,
270         struct ks8842_adapter *adapter)
271 {
272         /* check the status of the link */
273         if (ks8842_read16(adapter, 45, REG_P1MBSR) & 0x4) {
274                 netif_carrier_on(netdev);
275                 netif_wake_queue(netdev);
276         } else {
277                 netif_stop_queue(netdev);
278                 netif_carrier_off(netdev);
279         }
280 }
281 
282 static void ks8842_enable_tx(struct ks8842_adapter *adapter)
283 {
284         ks8842_enable_bits(adapter, 16, 0x01, REG_TXCR);
285 }
286 
287 static void ks8842_disable_tx(struct ks8842_adapter *adapter)
288 {
289         ks8842_clear_bits(adapter, 16, 0x01, REG_TXCR);
290 }
291 
292 static void ks8842_enable_rx(struct ks8842_adapter *adapter)
293 {
294         ks8842_enable_bits(adapter, 16, 0x01, REG_RXCR);
295 }
296 
297 static void ks8842_disable_rx(struct ks8842_adapter *adapter)
298 {
299         ks8842_clear_bits(adapter, 16, 0x01, REG_RXCR);
300 }
301 
302 static void ks8842_reset_hw(struct ks8842_adapter *adapter)
303 {
304         /* reset the HW */
305         ks8842_reset(adapter);
306 
307         /* Enable QMU Transmit flow control / transmit padding / Transmit CRC */
308         ks8842_write16(adapter, 16, 0x000E, REG_TXCR);
309 
310         /* enable the receiver, uni + multi + broadcast + flow ctrl
311                 + crc strip */
312         ks8842_write16(adapter, 16, 0x8 | 0x20 | 0x40 | 0x80 | 0x400,
313                 REG_RXCR);
314 
315         /* TX frame pointer autoincrement */
316         ks8842_write16(adapter, 17, 0x4000, REG_TXFDPR);
317 
318         /* RX frame pointer autoincrement */
319         ks8842_write16(adapter, 17, 0x4000, REG_RXFDPR);
320 
321         /* RX 2 kb high watermark */
322         ks8842_write16(adapter, 0, 0x1000, REG_QRFCR);
323 
324         /* aggressive back off in half duplex */
325         ks8842_enable_bits(adapter, 32, 1 << 8, REG_SGCR1);
326 
327         /* enable no excessive collison drop */
328         ks8842_enable_bits(adapter, 32, 1 << 3, REG_SGCR2);
329 
330         /* Enable port 1 force flow control / back pressure / transmit / recv */
331         ks8842_write16(adapter, 48, 0x1E07, REG_P1CR2);
332 
333         /* restart port auto-negotiation */
334         ks8842_enable_bits(adapter, 49, 1 << 13, REG_P1CR4);
335 
336         /* Enable the transmitter */
337         ks8842_enable_tx(adapter);
338 
339         /* Enable the receiver */
340         ks8842_enable_rx(adapter);
341 
342         /* clear all interrupts */
343         ks8842_write16(adapter, 18, 0xffff, REG_ISR);
344 
345         /* enable interrupts */
346         if (KS8842_USE_DMA(adapter)) {
347                 /* When running in DMA Mode the RX interrupt is not enabled in
348                    timberdale because RX data is received by DMA callbacks
349                    it must still be enabled in the KS8842 because it indicates
350                    to timberdale when there is RX data for it's DMA FIFOs */
351                 iowrite16(ENABLED_IRQS_DMA_IP, adapter->hw_addr + REG_TIMB_IER);
352                 ks8842_write16(adapter, 18, ENABLED_IRQS_DMA, REG_IER);
353         } else {
354                 if (!(adapter->conf_flags & MICREL_KS884X))
355                         iowrite16(ENABLED_IRQS,
356                                 adapter->hw_addr + REG_TIMB_IER);
357                 ks8842_write16(adapter, 18, ENABLED_IRQS, REG_IER);
358         }
359         /* enable the switch */
360         ks8842_write16(adapter, 32, 0x1, REG_SW_ID_AND_ENABLE);
361 }
362 
363 static void ks8842_read_mac_addr(struct ks8842_adapter *adapter, u8 *dest)
364 {
365         int i;
366         u16 mac;
367 
368         for (i = 0; i < ETH_ALEN; i++)
369                 dest[ETH_ALEN - i - 1] = ks8842_read8(adapter, 2, REG_MARL + i);
370 
371         if (adapter->conf_flags & MICREL_KS884X) {
372                 /*
373                 the sequence of saving mac addr between MAC and Switch is
374                 different.
375                 */
376 
377                 mac = ks8842_read16(adapter, 2, REG_MARL);
378                 ks8842_write16(adapter, 39, mac, REG_MACAR3);
379                 mac = ks8842_read16(adapter, 2, REG_MARM);
380                 ks8842_write16(adapter, 39, mac, REG_MACAR2);
381                 mac = ks8842_read16(adapter, 2, REG_MARH);
382                 ks8842_write16(adapter, 39, mac, REG_MACAR1);
383         } else {
384 
385                 /* make sure the switch port uses the same MAC as the QMU */
386                 mac = ks8842_read16(adapter, 2, REG_MARL);
387                 ks8842_write16(adapter, 39, mac, REG_MACAR1);
388                 mac = ks8842_read16(adapter, 2, REG_MARM);
389                 ks8842_write16(adapter, 39, mac, REG_MACAR2);
390                 mac = ks8842_read16(adapter, 2, REG_MARH);
391                 ks8842_write16(adapter, 39, mac, REG_MACAR3);
392         }
393 }
394 
395 static void ks8842_write_mac_addr(struct ks8842_adapter *adapter, u8 *mac)
396 {
397         unsigned long flags;
398         unsigned i;
399 
400         spin_lock_irqsave(&adapter->lock, flags);
401         for (i = 0; i < ETH_ALEN; i++) {
402                 ks8842_write8(adapter, 2, mac[ETH_ALEN - i - 1], REG_MARL + i);
403                 if (!(adapter->conf_flags & MICREL_KS884X))
404                         ks8842_write8(adapter, 39, mac[ETH_ALEN - i - 1],
405                                 REG_MACAR1 + i);
406         }
407 
408         if (adapter->conf_flags & MICREL_KS884X) {
409                 /*
410                 the sequence of saving mac addr between MAC and Switch is
411                 different.
412                 */
413 
414                 u16 mac;
415 
416                 mac = ks8842_read16(adapter, 2, REG_MARL);
417                 ks8842_write16(adapter, 39, mac, REG_MACAR3);
418                 mac = ks8842_read16(adapter, 2, REG_MARM);
419                 ks8842_write16(adapter, 39, mac, REG_MACAR2);
420                 mac = ks8842_read16(adapter, 2, REG_MARH);
421                 ks8842_write16(adapter, 39, mac, REG_MACAR1);
422         }
423         spin_unlock_irqrestore(&adapter->lock, flags);
424 }
425 
426 static inline u16 ks8842_tx_fifo_space(struct ks8842_adapter *adapter)
427 {
428         return ks8842_read16(adapter, 16, REG_TXMIR) & 0x1fff;
429 }
430 
431 static int ks8842_tx_frame_dma(struct sk_buff *skb, struct net_device *netdev)
432 {
433         struct ks8842_adapter *adapter = netdev_priv(netdev);
434         struct ks8842_tx_dma_ctl *ctl = &adapter->dma_tx;
435         u8 *buf = ctl->buf;
436 
437         if (ctl->adesc) {
438                 netdev_dbg(netdev, "%s: TX ongoing\n", __func__);
439                 /* transfer ongoing */
440                 return NETDEV_TX_BUSY;
441         }
442 
443         sg_dma_len(&ctl->sg) = skb->len + sizeof(u32);
444 
445         /* copy data to the TX buffer */
446         /* the control word, enable IRQ, port 1 and the length */
447         *buf++ = 0x00;
448         *buf++ = 0x01; /* Port 1 */
449         *buf++ = skb->len & 0xff;
450         *buf++ = (skb->len >> 8) & 0xff;
451         skb_copy_from_linear_data(skb, buf, skb->len);
452 
453         dma_sync_single_range_for_device(adapter->dev,
454                 sg_dma_address(&ctl->sg), 0, sg_dma_len(&ctl->sg),
455                 DMA_TO_DEVICE);
456 
457         /* make sure the length is a multiple of 4 */
458         if (sg_dma_len(&ctl->sg) % 4)
459                 sg_dma_len(&ctl->sg) += 4 - sg_dma_len(&ctl->sg) % 4;
460 
461         ctl->adesc = dmaengine_prep_slave_sg(ctl->chan,
462                 &ctl->sg, 1, DMA_MEM_TO_DEV, DMA_PREP_INTERRUPT);
463         if (!ctl->adesc)
464                 return NETDEV_TX_BUSY;
465 
466         ctl->adesc->callback_param = netdev;
467         ctl->adesc->callback = ks8842_dma_tx_cb;
468         ctl->adesc->tx_submit(ctl->adesc);
469 
470         netdev->stats.tx_bytes += skb->len;
471 
472         dev_kfree_skb(skb);
473 
474         return NETDEV_TX_OK;
475 }
476 
477 static int ks8842_tx_frame(struct sk_buff *skb, struct net_device *netdev)
478 {
479         struct ks8842_adapter *adapter = netdev_priv(netdev);
480         int len = skb->len;
481 
482         netdev_dbg(netdev, "%s: len %u head %p data %p tail %p end %p\n",
483                 __func__, skb->len, skb->head, skb->data,
484                 skb_tail_pointer(skb), skb_end_pointer(skb));
485 
486         /* check FIFO buffer space, we need space for CRC and command bits */
487         if (ks8842_tx_fifo_space(adapter) < len + 8)
488                 return NETDEV_TX_BUSY;
489 
490         if (adapter->conf_flags & KS884X_16BIT) {
491                 u16 *ptr16 = (u16 *)skb->data;
492                 ks8842_write16(adapter, 17, 0x8000 | 0x100, REG_QMU_DATA_LO);
493                 ks8842_write16(adapter, 17, (u16)len, REG_QMU_DATA_HI);
494                 netdev->stats.tx_bytes += len;
495 
496                 /* copy buffer */
497                 while (len > 0) {
498                         iowrite16(*ptr16++, adapter->hw_addr + REG_QMU_DATA_LO);
499                         iowrite16(*ptr16++, adapter->hw_addr + REG_QMU_DATA_HI);
500                         len -= sizeof(u32);
501                 }
502         } else {
503 
504                 u32 *ptr = (u32 *)skb->data;
505                 u32 ctrl;
506                 /* the control word, enable IRQ, port 1 and the length */
507                 ctrl = 0x8000 | 0x100 | (len << 16);
508                 ks8842_write32(adapter, 17, ctrl, REG_QMU_DATA_LO);
509 
510                 netdev->stats.tx_bytes += len;
511 
512                 /* copy buffer */
513                 while (len > 0) {
514                         iowrite32(*ptr, adapter->hw_addr + REG_QMU_DATA_LO);
515                         len -= sizeof(u32);
516                         ptr++;
517                 }
518         }
519 
520         /* enqueue packet */
521         ks8842_write16(adapter, 17, 1, REG_TXQCR);
522 
523         dev_kfree_skb(skb);
524 
525         return NETDEV_TX_OK;
526 }
527 
528 static void ks8842_update_rx_err_counters(struct net_device *netdev, u32 status)
529 {
530         netdev_dbg(netdev, "RX error, status: %x\n", status);
531 
532         netdev->stats.rx_errors++;
533         if (status & RXSR_TOO_LONG)
534                 netdev->stats.rx_length_errors++;
535         if (status & RXSR_CRC_ERROR)
536                 netdev->stats.rx_crc_errors++;
537         if (status & RXSR_RUNT)
538                 netdev->stats.rx_frame_errors++;
539 }
540 
541 static void ks8842_update_rx_counters(struct net_device *netdev, u32 status,
542         int len)
543 {
544         netdev_dbg(netdev, "RX packet, len: %d\n", len);
545 
546         netdev->stats.rx_packets++;
547         netdev->stats.rx_bytes += len;
548         if (status & RXSR_MULTICAST)
549                 netdev->stats.multicast++;
550 }
551 
552 static int __ks8842_start_new_rx_dma(struct net_device *netdev)
553 {
554         struct ks8842_adapter *adapter = netdev_priv(netdev);
555         struct ks8842_rx_dma_ctl *ctl = &adapter->dma_rx;
556         struct scatterlist *sg = &ctl->sg;
557         int err;
558 
559         ctl->skb = netdev_alloc_skb(netdev, DMA_BUFFER_SIZE);
560         if (ctl->skb) {
561                 sg_init_table(sg, 1);
562                 sg_dma_address(sg) = dma_map_single(adapter->dev,
563                         ctl->skb->data, DMA_BUFFER_SIZE, DMA_FROM_DEVICE);
564                 err = dma_mapping_error(adapter->dev, sg_dma_address(sg));
565                 if (unlikely(err)) {
566                         sg_dma_address(sg) = 0;
567                         goto out;
568                 }
569 
570                 sg_dma_len(sg) = DMA_BUFFER_SIZE;
571 
572                 ctl->adesc = dmaengine_prep_slave_sg(ctl->chan,
573                         sg, 1, DMA_DEV_TO_MEM, DMA_PREP_INTERRUPT);
574 
575                 if (!ctl->adesc)
576                         goto out;
577 
578                 ctl->adesc->callback_param = netdev;
579                 ctl->adesc->callback = ks8842_dma_rx_cb;
580                 ctl->adesc->tx_submit(ctl->adesc);
581         } else {
582                 err = -ENOMEM;
583                 sg_dma_address(sg) = 0;
584                 goto out;
585         }
586 
587         return err;
588 out:
589         if (sg_dma_address(sg))
590                 dma_unmap_single(adapter->dev, sg_dma_address(sg),
591                         DMA_BUFFER_SIZE, DMA_FROM_DEVICE);
592         sg_dma_address(sg) = 0;
593         if (ctl->skb)
594                 dev_kfree_skb(ctl->skb);
595 
596         ctl->skb = NULL;
597 
598         printk(KERN_ERR DRV_NAME": Failed to start RX DMA: %d\n", err);
599         return err;
600 }
601 
602 static void ks8842_rx_frame_dma_tasklet(unsigned long arg)
603 {
604         struct net_device *netdev = (struct net_device *)arg;
605         struct ks8842_adapter *adapter = netdev_priv(netdev);
606         struct ks8842_rx_dma_ctl *ctl = &adapter->dma_rx;
607         struct sk_buff *skb = ctl->skb;
608         dma_addr_t addr = sg_dma_address(&ctl->sg);
609         u32 status;
610 
611         ctl->adesc = NULL;
612 
613         /* kick next transfer going */
614         __ks8842_start_new_rx_dma(netdev);
615 
616         /* now handle the data we got */
617         dma_unmap_single(adapter->dev, addr, DMA_BUFFER_SIZE, DMA_FROM_DEVICE);
618 
619         status = *((u32 *)skb->data);
620 
621         netdev_dbg(netdev, "%s - rx_data: status: %x\n",
622                 __func__, status & 0xffff);
623 
624         /* check the status */
625         if ((status & RXSR_VALID) && !(status & RXSR_ERROR)) {
626                 int len = (status >> 16) & 0x7ff;
627 
628                 ks8842_update_rx_counters(netdev, status, len);
629 
630                 /* reserve 4 bytes which is the status word */
631                 skb_reserve(skb, 4);
632                 skb_put(skb, len);
633 
634                 skb->protocol = eth_type_trans(skb, netdev);
635                 netif_rx(skb);
636         } else {
637                 ks8842_update_rx_err_counters(netdev, status);
638                 dev_kfree_skb(skb);
639         }
640 }
641 
642 static void ks8842_rx_frame(struct net_device *netdev,
643         struct ks8842_adapter *adapter)
644 {
645         u32 status;
646         int len;
647 
648         if (adapter->conf_flags & KS884X_16BIT) {
649                 status = ks8842_read16(adapter, 17, REG_QMU_DATA_LO);
650                 len = ks8842_read16(adapter, 17, REG_QMU_DATA_HI);
651                 netdev_dbg(netdev, "%s - rx_data: status: %x\n",
652                            __func__, status);
653         } else {
654                 status = ks8842_read32(adapter, 17, REG_QMU_DATA_LO);
655                 len = (status >> 16) & 0x7ff;
656                 status &= 0xffff;
657                 netdev_dbg(netdev, "%s - rx_data: status: %x\n",
658                            __func__, status);
659         }
660 
661         /* check the status */
662         if ((status & RXSR_VALID) && !(status & RXSR_ERROR)) {
663                 struct sk_buff *skb = netdev_alloc_skb_ip_align(netdev, len + 3);
664 
665                 if (skb) {
666 
667                         ks8842_update_rx_counters(netdev, status, len);
668 
669                         if (adapter->conf_flags & KS884X_16BIT) {
670                                 u16 *data16 = (u16 *)skb_put(skb, len);
671                                 ks8842_select_bank(adapter, 17);
672                                 while (len > 0) {
673                                         *data16++ = ioread16(adapter->hw_addr +
674                                                 REG_QMU_DATA_LO);
675                                         *data16++ = ioread16(adapter->hw_addr +
676                                                 REG_QMU_DATA_HI);
677                                         len -= sizeof(u32);
678                                 }
679                         } else {
680                                 u32 *data = (u32 *)skb_put(skb, len);
681 
682                                 ks8842_select_bank(adapter, 17);
683                                 while (len > 0) {
684                                         *data++ = ioread32(adapter->hw_addr +
685                                                 REG_QMU_DATA_LO);
686                                         len -= sizeof(u32);
687                                 }
688                         }
689                         skb->protocol = eth_type_trans(skb, netdev);
690                         netif_rx(skb);
691                 } else
692                         netdev->stats.rx_dropped++;
693         } else
694                 ks8842_update_rx_err_counters(netdev, status);
695 
696         /* set high watermark to 3K */
697         ks8842_clear_bits(adapter, 0, 1 << 12, REG_QRFCR);
698 
699         /* release the frame */
700         ks8842_write16(adapter, 17, 0x01, REG_RXQCR);
701 
702         /* set high watermark to 2K */
703         ks8842_enable_bits(adapter, 0, 1 << 12, REG_QRFCR);
704 }
705 
706 static void ks8842_handle_rx(struct net_device *netdev,
707         struct ks8842_adapter *adapter)
708 {
709         u16 rx_data = ks8842_read16(adapter, 16, REG_RXMIR) & 0x1fff;
710         netdev_dbg(netdev, "%s Entry - rx_data: %d\n", __func__, rx_data);
711         while (rx_data) {
712                 ks8842_rx_frame(netdev, adapter);
713                 rx_data = ks8842_read16(adapter, 16, REG_RXMIR) & 0x1fff;
714         }
715 }
716 
717 static void ks8842_handle_tx(struct net_device *netdev,
718         struct ks8842_adapter *adapter)
719 {
720         u16 sr = ks8842_read16(adapter, 16, REG_TXSR);
721         netdev_dbg(netdev, "%s - entry, sr: %x\n", __func__, sr);
722         netdev->stats.tx_packets++;
723         if (netif_queue_stopped(netdev))
724                 netif_wake_queue(netdev);
725 }
726 
727 static void ks8842_handle_rx_overrun(struct net_device *netdev,
728         struct ks8842_adapter *adapter)
729 {
730         netdev_dbg(netdev, "%s: entry\n", __func__);
731         netdev->stats.rx_errors++;
732         netdev->stats.rx_fifo_errors++;
733 }
734 
735 static void ks8842_tasklet(unsigned long arg)
736 {
737         struct net_device *netdev = (struct net_device *)arg;
738         struct ks8842_adapter *adapter = netdev_priv(netdev);
739         u16 isr;
740         unsigned long flags;
741         u16 entry_bank;
742 
743         /* read current bank to be able to set it back */
744         spin_lock_irqsave(&adapter->lock, flags);
745         entry_bank = ioread16(adapter->hw_addr + REG_SELECT_BANK);
746         spin_unlock_irqrestore(&adapter->lock, flags);
747 
748         isr = ks8842_read16(adapter, 18, REG_ISR);
749         netdev_dbg(netdev, "%s - ISR: 0x%x\n", __func__, isr);
750 
751         /* when running in DMA mode, do not ack RX interrupts, it is handled
752            internally by timberdale, otherwise it's DMA FIFO:s would stop
753         */
754         if (KS8842_USE_DMA(adapter))
755                 isr &= ~IRQ_RX;
756 
757         /* Ack */
758         ks8842_write16(adapter, 18, isr, REG_ISR);
759 
760         if (!(adapter->conf_flags & MICREL_KS884X))
761                 /* Ack in the timberdale IP as well */
762                 iowrite32(0x1, adapter->hw_addr + REG_TIMB_IAR);
763 
764         if (!netif_running(netdev))
765                 return;
766 
767         if (isr & IRQ_LINK_CHANGE)
768                 ks8842_update_link_status(netdev, adapter);
769 
770         /* should not get IRQ_RX when running DMA mode */
771         if (isr & (IRQ_RX | IRQ_RX_ERROR) && !KS8842_USE_DMA(adapter))
772                 ks8842_handle_rx(netdev, adapter);
773 
774         /* should only happen when in PIO mode */
775         if (isr & IRQ_TX)
776                 ks8842_handle_tx(netdev, adapter);
777 
778         if (isr & IRQ_RX_OVERRUN)
779                 ks8842_handle_rx_overrun(netdev, adapter);
780 
781         if (isr & IRQ_TX_STOPPED) {
782                 ks8842_disable_tx(adapter);
783                 ks8842_enable_tx(adapter);
784         }
785 
786         if (isr & IRQ_RX_STOPPED) {
787                 ks8842_disable_rx(adapter);
788                 ks8842_enable_rx(adapter);
789         }
790 
791         /* re-enable interrupts, put back the bank selection register */
792         spin_lock_irqsave(&adapter->lock, flags);
793         if (KS8842_USE_DMA(adapter))
794                 ks8842_write16(adapter, 18, ENABLED_IRQS_DMA, REG_IER);
795         else
796                 ks8842_write16(adapter, 18, ENABLED_IRQS, REG_IER);
797         iowrite16(entry_bank, adapter->hw_addr + REG_SELECT_BANK);
798 
799         /* Make sure timberdale continues DMA operations, they are stopped while
800            we are handling the ks8842 because we might change bank */
801         if (KS8842_USE_DMA(adapter))
802                 ks8842_resume_dma(adapter);
803 
804         spin_unlock_irqrestore(&adapter->lock, flags);
805 }
806 
807 static irqreturn_t ks8842_irq(int irq, void *devid)
808 {
809         struct net_device *netdev = devid;
810         struct ks8842_adapter *adapter = netdev_priv(netdev);
811         u16 isr;
812         u16 entry_bank = ioread16(adapter->hw_addr + REG_SELECT_BANK);
813         irqreturn_t ret = IRQ_NONE;
814 
815         isr = ks8842_read16(adapter, 18, REG_ISR);
816         netdev_dbg(netdev, "%s - ISR: 0x%x\n", __func__, isr);
817 
818         if (isr) {
819                 if (KS8842_USE_DMA(adapter))
820                         /* disable all but RX IRQ, since the FPGA relies on it*/
821                         ks8842_write16(adapter, 18, IRQ_RX, REG_IER);
822                 else
823                         /* disable IRQ */
824                         ks8842_write16(adapter, 18, 0x00, REG_IER);
825 
826                 /* schedule tasklet */
827                 tasklet_schedule(&adapter->tasklet);
828 
829                 ret = IRQ_HANDLED;
830         }
831 
832         iowrite16(entry_bank, adapter->hw_addr + REG_SELECT_BANK);
833 
834         /* After an interrupt, tell timberdale to continue DMA operations.
835            DMA is disabled while we are handling the ks8842 because we might
836            change bank */
837         ks8842_resume_dma(adapter);
838 
839         return ret;
840 }
841 
842 static void ks8842_dma_rx_cb(void *data)
843 {
844         struct net_device       *netdev = data;
845         struct ks8842_adapter   *adapter = netdev_priv(netdev);
846 
847         netdev_dbg(netdev, "RX DMA finished\n");
848         /* schedule tasklet */
849         if (adapter->dma_rx.adesc)
850                 tasklet_schedule(&adapter->dma_rx.tasklet);
851 }
852 
853 static void ks8842_dma_tx_cb(void *data)
854 {
855         struct net_device               *netdev = data;
856         struct ks8842_adapter           *adapter = netdev_priv(netdev);
857         struct ks8842_tx_dma_ctl        *ctl = &adapter->dma_tx;
858 
859         netdev_dbg(netdev, "TX DMA finished\n");
860 
861         if (!ctl->adesc)
862                 return;
863 
864         netdev->stats.tx_packets++;
865         ctl->adesc = NULL;
866 
867         if (netif_queue_stopped(netdev))
868                 netif_wake_queue(netdev);
869 }
870 
871 static void ks8842_stop_dma(struct ks8842_adapter *adapter)
872 {
873         struct ks8842_tx_dma_ctl *tx_ctl = &adapter->dma_tx;
874         struct ks8842_rx_dma_ctl *rx_ctl = &adapter->dma_rx;
875 
876         tx_ctl->adesc = NULL;
877         if (tx_ctl->chan)
878                 tx_ctl->chan->device->device_control(tx_ctl->chan,
879                         DMA_TERMINATE_ALL, 0);
880 
881         rx_ctl->adesc = NULL;
882         if (rx_ctl->chan)
883                 rx_ctl->chan->device->device_control(rx_ctl->chan,
884                         DMA_TERMINATE_ALL, 0);
885 
886         if (sg_dma_address(&rx_ctl->sg))
887                 dma_unmap_single(adapter->dev, sg_dma_address(&rx_ctl->sg),
888                         DMA_BUFFER_SIZE, DMA_FROM_DEVICE);
889         sg_dma_address(&rx_ctl->sg) = 0;
890 
891         dev_kfree_skb(rx_ctl->skb);
892         rx_ctl->skb = NULL;
893 }
894 
895 static void ks8842_dealloc_dma_bufs(struct ks8842_adapter *adapter)
896 {
897         struct ks8842_tx_dma_ctl *tx_ctl = &adapter->dma_tx;
898         struct ks8842_rx_dma_ctl *rx_ctl = &adapter->dma_rx;
899 
900         ks8842_stop_dma(adapter);
901 
902         if (tx_ctl->chan)
903                 dma_release_channel(tx_ctl->chan);
904         tx_ctl->chan = NULL;
905 
906         if (rx_ctl->chan)
907                 dma_release_channel(rx_ctl->chan);
908         rx_ctl->chan = NULL;
909 
910         tasklet_kill(&rx_ctl->tasklet);
911 
912         if (sg_dma_address(&tx_ctl->sg))
913                 dma_unmap_single(adapter->dev, sg_dma_address(&tx_ctl->sg),
914                         DMA_BUFFER_SIZE, DMA_TO_DEVICE);
915         sg_dma_address(&tx_ctl->sg) = 0;
916 
917         kfree(tx_ctl->buf);
918         tx_ctl->buf = NULL;
919 }
920 
921 static bool ks8842_dma_filter_fn(struct dma_chan *chan, void *filter_param)
922 {
923         return chan->chan_id == (long)filter_param;
924 }
925 
926 static int ks8842_alloc_dma_bufs(struct net_device *netdev)
927 {
928         struct ks8842_adapter *adapter = netdev_priv(netdev);
929         struct ks8842_tx_dma_ctl *tx_ctl = &adapter->dma_tx;
930         struct ks8842_rx_dma_ctl *rx_ctl = &adapter->dma_rx;
931         int err;
932 
933         dma_cap_mask_t mask;
934 
935         dma_cap_zero(mask);
936         dma_cap_set(DMA_SLAVE, mask);
937         dma_cap_set(DMA_PRIVATE, mask);
938 
939         sg_init_table(&tx_ctl->sg, 1);
940 
941         tx_ctl->chan = dma_request_channel(mask, ks8842_dma_filter_fn,
942                                            (void *)(long)tx_ctl->channel);
943         if (!tx_ctl->chan) {
944                 err = -ENODEV;
945                 goto err;
946         }
947 
948         /* allocate DMA buffer */
949         tx_ctl->buf = kmalloc(DMA_BUFFER_SIZE, GFP_KERNEL);
950         if (!tx_ctl->buf) {
951                 err = -ENOMEM;
952                 goto err;
953         }
954 
955         sg_dma_address(&tx_ctl->sg) = dma_map_single(adapter->dev,
956                 tx_ctl->buf, DMA_BUFFER_SIZE, DMA_TO_DEVICE);
957         err = dma_mapping_error(adapter->dev,
958                 sg_dma_address(&tx_ctl->sg));
959         if (err) {
960                 sg_dma_address(&tx_ctl->sg) = 0;
961                 goto err;
962         }
963 
964         rx_ctl->chan = dma_request_channel(mask, ks8842_dma_filter_fn,
965                                            (void *)(long)rx_ctl->channel);
966         if (!rx_ctl->chan) {
967                 err = -ENODEV;
968                 goto err;
969         }
970 
971         tasklet_init(&rx_ctl->tasklet, ks8842_rx_frame_dma_tasklet,
972                 (unsigned long)netdev);
973 
974         return 0;
975 err:
976         ks8842_dealloc_dma_bufs(adapter);
977         return err;
978 }
979 
980 /* Netdevice operations */
981 
982 static int ks8842_open(struct net_device *netdev)
983 {
984         struct ks8842_adapter *adapter = netdev_priv(netdev);
985         int err;
986 
987         netdev_dbg(netdev, "%s - entry\n", __func__);
988 
989         if (KS8842_USE_DMA(adapter)) {
990                 err = ks8842_alloc_dma_bufs(netdev);
991 
992                 if (!err) {
993                         /* start RX dma */
994                         err = __ks8842_start_new_rx_dma(netdev);
995                         if (err)
996                                 ks8842_dealloc_dma_bufs(adapter);
997                 }
998 
999                 if (err) {
1000                         printk(KERN_WARNING DRV_NAME
1001                                 ": Failed to initiate DMA, running PIO\n");
1002                         ks8842_dealloc_dma_bufs(adapter);
1003                         adapter->dma_rx.channel = -1;
1004                         adapter->dma_tx.channel = -1;
1005                 }
1006         }
1007 
1008         /* reset the HW */
1009         ks8842_reset_hw(adapter);
1010 
1011         ks8842_write_mac_addr(adapter, netdev->dev_addr);
1012 
1013         ks8842_update_link_status(netdev, adapter);
1014 
1015         err = request_irq(adapter->irq, ks8842_irq, IRQF_SHARED, DRV_NAME,
1016                 netdev);
1017         if (err) {
1018                 pr_err("Failed to request IRQ: %d: %d\n", adapter->irq, err);
1019                 return err;
1020         }
1021 
1022         return 0;
1023 }
1024 
1025 static int ks8842_close(struct net_device *netdev)
1026 {
1027         struct ks8842_adapter *adapter = netdev_priv(netdev);
1028 
1029         netdev_dbg(netdev, "%s - entry\n", __func__);
1030 
1031         cancel_work_sync(&adapter->timeout_work);
1032 
1033         if (KS8842_USE_DMA(adapter))
1034                 ks8842_dealloc_dma_bufs(adapter);
1035 
1036         /* free the irq */
1037         free_irq(adapter->irq, netdev);
1038 
1039         /* disable the switch */
1040         ks8842_write16(adapter, 32, 0x0, REG_SW_ID_AND_ENABLE);
1041 
1042         return 0;
1043 }
1044 
1045 static netdev_tx_t ks8842_xmit_frame(struct sk_buff *skb,
1046                                      struct net_device *netdev)
1047 {
1048         int ret;
1049         struct ks8842_adapter *adapter = netdev_priv(netdev);
1050 
1051         netdev_dbg(netdev, "%s: entry\n", __func__);
1052 
1053         if (KS8842_USE_DMA(adapter)) {
1054                 unsigned long flags;
1055                 ret = ks8842_tx_frame_dma(skb, netdev);
1056                 /* for now only allow one transfer at the time */
1057                 spin_lock_irqsave(&adapter->lock, flags);
1058                 if (adapter->dma_tx.adesc)
1059                         netif_stop_queue(netdev);
1060                 spin_unlock_irqrestore(&adapter->lock, flags);
1061                 return ret;
1062         }
1063 
1064         ret = ks8842_tx_frame(skb, netdev);
1065 
1066         if (ks8842_tx_fifo_space(adapter) <  netdev->mtu + 8)
1067                 netif_stop_queue(netdev);
1068 
1069         return ret;
1070 }
1071 
1072 static int ks8842_set_mac(struct net_device *netdev, void *p)
1073 {
1074         struct ks8842_adapter *adapter = netdev_priv(netdev);
1075         struct sockaddr *addr = p;
1076         char *mac = (u8 *)addr->sa_data;
1077 
1078         netdev_dbg(netdev, "%s: entry\n", __func__);
1079 
1080         if (!is_valid_ether_addr(addr->sa_data))
1081                 return -EADDRNOTAVAIL;
1082 
1083         memcpy(netdev->dev_addr, mac, netdev->addr_len);
1084 
1085         ks8842_write_mac_addr(adapter, mac);
1086         return 0;
1087 }
1088 
1089 static void ks8842_tx_timeout_work(struct work_struct *work)
1090 {
1091         struct ks8842_adapter *adapter =
1092                 container_of(work, struct ks8842_adapter, timeout_work);
1093         struct net_device *netdev = adapter->netdev;
1094         unsigned long flags;
1095 
1096         netdev_dbg(netdev, "%s: entry\n", __func__);
1097 
1098         spin_lock_irqsave(&adapter->lock, flags);
1099 
1100         if (KS8842_USE_DMA(adapter))
1101                 ks8842_stop_dma(adapter);
1102 
1103         /* disable interrupts */
1104         ks8842_write16(adapter, 18, 0, REG_IER);
1105         ks8842_write16(adapter, 18, 0xFFFF, REG_ISR);
1106 
1107         netif_stop_queue(netdev);
1108 
1109         spin_unlock_irqrestore(&adapter->lock, flags);
1110 
1111         ks8842_reset_hw(adapter);
1112 
1113         ks8842_write_mac_addr(adapter, netdev->dev_addr);
1114 
1115         ks8842_update_link_status(netdev, adapter);
1116 
1117         if (KS8842_USE_DMA(adapter))
1118                 __ks8842_start_new_rx_dma(netdev);
1119 }
1120 
1121 static void ks8842_tx_timeout(struct net_device *netdev)
1122 {
1123         struct ks8842_adapter *adapter = netdev_priv(netdev);
1124 
1125         netdev_dbg(netdev, "%s: entry\n", __func__);
1126 
1127         schedule_work(&adapter->timeout_work);
1128 }
1129 
1130 static const struct net_device_ops ks8842_netdev_ops = {
1131         .ndo_open               = ks8842_open,
1132         .ndo_stop               = ks8842_close,
1133         .ndo_start_xmit         = ks8842_xmit_frame,
1134         .ndo_set_mac_address    = ks8842_set_mac,
1135         .ndo_tx_timeout         = ks8842_tx_timeout,
1136         .ndo_validate_addr      = eth_validate_addr
1137 };
1138 
1139 static const struct ethtool_ops ks8842_ethtool_ops = {
1140         .get_link               = ethtool_op_get_link,
1141 };
1142 
1143 static int ks8842_probe(struct platform_device *pdev)
1144 {
1145         int err = -ENOMEM;
1146         struct resource *iomem;
1147         struct net_device *netdev;
1148         struct ks8842_adapter *adapter;
1149         struct ks8842_platform_data *pdata = dev_get_platdata(&pdev->dev);
1150         u16 id;
1151         unsigned i;
1152 
1153         iomem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1154         if (!request_mem_region(iomem->start, resource_size(iomem), DRV_NAME))
1155                 goto err_mem_region;
1156 
1157         netdev = alloc_etherdev(sizeof(struct ks8842_adapter));
1158         if (!netdev)
1159                 goto err_alloc_etherdev;
1160 
1161         SET_NETDEV_DEV(netdev, &pdev->dev);
1162 
1163         adapter = netdev_priv(netdev);
1164         adapter->netdev = netdev;
1165         INIT_WORK(&adapter->timeout_work, ks8842_tx_timeout_work);
1166         adapter->hw_addr = ioremap(iomem->start, resource_size(iomem));
1167         adapter->conf_flags = iomem->flags;
1168 
1169         if (!adapter->hw_addr)
1170                 goto err_ioremap;
1171 
1172         adapter->irq = platform_get_irq(pdev, 0);
1173         if (adapter->irq < 0) {
1174                 err = adapter->irq;
1175                 goto err_get_irq;
1176         }
1177 
1178         adapter->dev = (pdev->dev.parent) ? pdev->dev.parent : &pdev->dev;
1179 
1180         /* DMA is only supported when accessed via timberdale */
1181         if (!(adapter->conf_flags & MICREL_KS884X) && pdata &&
1182                 (pdata->tx_dma_channel != -1) &&
1183                 (pdata->rx_dma_channel != -1)) {
1184                 adapter->dma_rx.channel = pdata->rx_dma_channel;
1185                 adapter->dma_tx.channel = pdata->tx_dma_channel;
1186         } else {
1187                 adapter->dma_rx.channel = -1;
1188                 adapter->dma_tx.channel = -1;
1189         }
1190 
1191         tasklet_init(&adapter->tasklet, ks8842_tasklet, (unsigned long)netdev);
1192         spin_lock_init(&adapter->lock);
1193 
1194         netdev->netdev_ops = &ks8842_netdev_ops;
1195         netdev->ethtool_ops = &ks8842_ethtool_ops;
1196 
1197         /* Check if a mac address was given */
1198         i = netdev->addr_len;
1199         if (pdata) {
1200                 for (i = 0; i < netdev->addr_len; i++)
1201                         if (pdata->macaddr[i] != 0)
1202                                 break;
1203 
1204                 if (i < netdev->addr_len)
1205                         /* an address was passed, use it */
1206                         memcpy(netdev->dev_addr, pdata->macaddr,
1207                                 netdev->addr_len);
1208         }
1209 
1210         if (i == netdev->addr_len) {
1211                 ks8842_read_mac_addr(adapter, netdev->dev_addr);
1212 
1213                 if (!is_valid_ether_addr(netdev->dev_addr))
1214                         eth_hw_addr_random(netdev);
1215         }
1216 
1217         id = ks8842_read16(adapter, 32, REG_SW_ID_AND_ENABLE);
1218 
1219         strcpy(netdev->name, "eth%d");
1220         err = register_netdev(netdev);
1221         if (err)
1222                 goto err_register;
1223 
1224         platform_set_drvdata(pdev, netdev);
1225 
1226         pr_info("Found chip, family: 0x%x, id: 0x%x, rev: 0x%x\n",
1227                 (id >> 8) & 0xff, (id >> 4) & 0xf, (id >> 1) & 0x7);
1228 
1229         return 0;
1230 
1231 err_register:
1232 err_get_irq:
1233         iounmap(adapter->hw_addr);
1234 err_ioremap:
1235         free_netdev(netdev);
1236 err_alloc_etherdev:
1237         release_mem_region(iomem->start, resource_size(iomem));
1238 err_mem_region:
1239         return err;
1240 }
1241 
1242 static int ks8842_remove(struct platform_device *pdev)
1243 {
1244         struct net_device *netdev = platform_get_drvdata(pdev);
1245         struct ks8842_adapter *adapter = netdev_priv(netdev);
1246         struct resource *iomem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1247 
1248         unregister_netdev(netdev);
1249         tasklet_kill(&adapter->tasklet);
1250         iounmap(adapter->hw_addr);
1251         free_netdev(netdev);
1252         release_mem_region(iomem->start, resource_size(iomem));
1253         return 0;
1254 }
1255 
1256 
1257 static struct platform_driver ks8842_platform_driver = {
1258         .driver = {
1259                 .name   = DRV_NAME,
1260                 .owner  = THIS_MODULE,
1261         },
1262         .probe          = ks8842_probe,
1263         .remove         = ks8842_remove,
1264 };
1265 
1266 module_platform_driver(ks8842_platform_driver);
1267 
1268 MODULE_DESCRIPTION("Timberdale KS8842 ethernet driver");
1269 MODULE_AUTHOR("Mocean Laboratories <info@mocean-labs.com>");
1270 MODULE_LICENSE("GPL v2");
1271 MODULE_ALIAS("platform:ks8842");
1272 
1273 

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