2 * ks8842.c timberdale KS8842 ethernet driver
3 * Copyright (c) 2009 Intel Corporation
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.
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.
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.
20 * The Micrel KS8842 behind the timberdale FPGA
21 * The genuine Micrel KS8841/42 device with ISA 16/32bit bus interface
24 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
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 #include <linux/dmaengine.h>
34 #include <linux/dma-mapping.h>
35 #include <linux/scatterlist.h>
37 #define DRV_NAME "ks8842"
39 /* Timberdale specific Registers */
40 #define REG_TIMB_RST 0x1c
41 #define REG_TIMB_FIFO 0x20
42 #define REG_TIMB_ISR 0x24
43 #define REG_TIMB_IER 0x28
44 #define REG_TIMB_IAR 0x2C
45 #define REQ_TIMB_DMA_RESUME 0x30
47 /* KS8842 registers */
49 #define REG_SELECT_BANK 0x0e
51 /* bank 0 registers */
52 #define REG_QRFCR 0x04
54 /* bank 2 registers */
59 /* bank 3 registers */
62 /* bank 16 registers */
66 #define REG_TXMIR 0x08
67 #define REG_RXMIR 0x0A
69 /* bank 17 registers */
70 #define REG_TXQCR 0x00
71 #define REG_RXQCR 0x02
72 #define REG_TXFDPR 0x04
73 #define REG_RXFDPR 0x06
74 #define REG_QMU_DATA_LO 0x08
75 #define REG_QMU_DATA_HI 0x0A
77 /* bank 18 registers */
79 #define IRQ_LINK_CHANGE 0x8000
82 #define IRQ_RX_OVERRUN 0x0800
83 #define IRQ_TX_STOPPED 0x0200
84 #define IRQ_RX_STOPPED 0x0100
85 #define IRQ_RX_ERROR 0x0080
86 #define ENABLED_IRQS (IRQ_LINK_CHANGE | IRQ_TX | IRQ_RX | IRQ_RX_STOPPED | \
87 IRQ_TX_STOPPED | IRQ_RX_OVERRUN | IRQ_RX_ERROR)
88 /* When running via timberdale in DMA mode, the RX interrupt should be
89 enabled in the KS8842, but not in the FPGA IP, since the IP handles
91 TX interrupts are not needed it is handled by the FPGA the driver is
92 notified via DMA callbacks.
94 #define ENABLED_IRQS_DMA_IP (IRQ_LINK_CHANGE | IRQ_RX_STOPPED | \
95 IRQ_TX_STOPPED | IRQ_RX_OVERRUN | IRQ_RX_ERROR)
96 #define ENABLED_IRQS_DMA (ENABLED_IRQS_DMA_IP | IRQ_RX)
99 #define RXSR_VALID 0x8000
100 #define RXSR_BROADCAST 0x80
101 #define RXSR_MULTICAST 0x40
102 #define RXSR_UNICAST 0x20
103 #define RXSR_FRAMETYPE 0x08
104 #define RXSR_TOO_LONG 0x04
105 #define RXSR_RUNT 0x02
106 #define RXSR_CRC_ERROR 0x01
107 #define RXSR_ERROR (RXSR_TOO_LONG | RXSR_RUNT | RXSR_CRC_ERROR)
109 /* bank 32 registers */
110 #define REG_SW_ID_AND_ENABLE 0x00
111 #define REG_SGCR1 0x02
112 #define REG_SGCR2 0x04
113 #define REG_SGCR3 0x06
115 /* bank 39 registers */
116 #define REG_MACAR1 0x00
117 #define REG_MACAR2 0x02
118 #define REG_MACAR3 0x04
120 /* bank 45 registers */
121 #define REG_P1MBCR 0x00
122 #define REG_P1MBSR 0x02
124 /* bank 46 registers */
125 #define REG_P2MBCR 0x00
126 #define REG_P2MBSR 0x02
128 /* bank 48 registers */
129 #define REG_P1CR2 0x02
131 /* bank 49 registers */
132 #define REG_P1CR4 0x02
133 #define REG_P1SR 0x04
135 /* flags passed by platform_device for configuration */
136 #define MICREL_KS884X 0x01 /* 0=Timeberdale(FPGA), 1=Micrel */
137 #define KS884X_16BIT 0x02 /* 1=16bit, 0=32bit */
139 #define DMA_BUFFER_SIZE 2048
141 struct ks8842_tx_dma_ctl {
142 struct dma_chan *chan;
143 struct dma_async_tx_descriptor *adesc;
145 struct scatterlist sg;
149 struct ks8842_rx_dma_ctl {
150 struct dma_chan *chan;
151 struct dma_async_tx_descriptor *adesc;
153 struct scatterlist sg;
154 struct tasklet_struct tasklet;
158 #define KS8842_USE_DMA(adapter) (((adapter)->dma_tx.channel != -1) && \
159 ((adapter)->dma_rx.channel != -1))
161 struct ks8842_adapter {
162 void __iomem *hw_addr;
164 unsigned long conf_flags; /* copy of platform_device config */
165 struct tasklet_struct tasklet;
166 spinlock_t lock; /* spinlock to be interrupt safe */
167 struct work_struct timeout_work;
168 struct net_device *netdev;
170 struct ks8842_tx_dma_ctl dma_tx;
171 struct ks8842_rx_dma_ctl dma_rx;
174 static void ks8842_dma_rx_cb(void *data);
175 static void ks8842_dma_tx_cb(void *data);
177 static inline void ks8842_resume_dma(struct ks8842_adapter *adapter)
179 iowrite32(1, adapter->hw_addr + REQ_TIMB_DMA_RESUME);
182 static inline void ks8842_select_bank(struct ks8842_adapter *adapter, u16 bank)
184 iowrite16(bank, adapter->hw_addr + REG_SELECT_BANK);
187 static inline void ks8842_write8(struct ks8842_adapter *adapter, u16 bank,
188 u8 value, int offset)
190 ks8842_select_bank(adapter, bank);
191 iowrite8(value, adapter->hw_addr + offset);
194 static inline void ks8842_write16(struct ks8842_adapter *adapter, u16 bank,
195 u16 value, int offset)
197 ks8842_select_bank(adapter, bank);
198 iowrite16(value, adapter->hw_addr + offset);
201 static inline void ks8842_enable_bits(struct ks8842_adapter *adapter, u16 bank,
202 u16 bits, int offset)
205 ks8842_select_bank(adapter, bank);
206 reg = ioread16(adapter->hw_addr + offset);
208 iowrite16(reg, adapter->hw_addr + offset);
211 static inline void ks8842_clear_bits(struct ks8842_adapter *adapter, u16 bank,
212 u16 bits, int offset)
215 ks8842_select_bank(adapter, bank);
216 reg = ioread16(adapter->hw_addr + offset);
218 iowrite16(reg, adapter->hw_addr + offset);
221 static inline void ks8842_write32(struct ks8842_adapter *adapter, u16 bank,
222 u32 value, int offset)
224 ks8842_select_bank(adapter, bank);
225 iowrite32(value, adapter->hw_addr + offset);
228 static inline u8 ks8842_read8(struct ks8842_adapter *adapter, u16 bank,
231 ks8842_select_bank(adapter, bank);
232 return ioread8(adapter->hw_addr + offset);
235 static inline u16 ks8842_read16(struct ks8842_adapter *adapter, u16 bank,
238 ks8842_select_bank(adapter, bank);
239 return ioread16(adapter->hw_addr + offset);
242 static inline u32 ks8842_read32(struct ks8842_adapter *adapter, u16 bank,
245 ks8842_select_bank(adapter, bank);
246 return ioread32(adapter->hw_addr + offset);
249 static void ks8842_reset(struct ks8842_adapter *adapter)
251 if (adapter->conf_flags & MICREL_KS884X) {
252 ks8842_write16(adapter, 3, 1, REG_GRR);
254 iowrite16(0, adapter->hw_addr + REG_GRR);
256 /* The KS8842 goes haywire when doing softare reset
257 * a work around in the timberdale IP is implemented to
258 * do a hardware reset instead
259 ks8842_write16(adapter, 3, 1, REG_GRR);
261 iowrite16(0, adapter->hw_addr + REG_GRR);
263 iowrite32(0x1, adapter->hw_addr + REG_TIMB_RST);
268 static void ks8842_update_link_status(struct net_device *netdev,
269 struct ks8842_adapter *adapter)
271 /* check the status of the link */
272 if (ks8842_read16(adapter, 45, REG_P1MBSR) & 0x4) {
273 netif_carrier_on(netdev);
274 netif_wake_queue(netdev);
276 netif_stop_queue(netdev);
277 netif_carrier_off(netdev);
281 static void ks8842_enable_tx(struct ks8842_adapter *adapter)
283 ks8842_enable_bits(adapter, 16, 0x01, REG_TXCR);
286 static void ks8842_disable_tx(struct ks8842_adapter *adapter)
288 ks8842_clear_bits(adapter, 16, 0x01, REG_TXCR);
291 static void ks8842_enable_rx(struct ks8842_adapter *adapter)
293 ks8842_enable_bits(adapter, 16, 0x01, REG_RXCR);
296 static void ks8842_disable_rx(struct ks8842_adapter *adapter)
298 ks8842_clear_bits(adapter, 16, 0x01, REG_RXCR);
301 static void ks8842_reset_hw(struct ks8842_adapter *adapter)
304 ks8842_reset(adapter);
306 /* Enable QMU Transmit flow control / transmit padding / Transmit CRC */
307 ks8842_write16(adapter, 16, 0x000E, REG_TXCR);
309 /* enable the receiver, uni + multi + broadcast + flow ctrl
311 ks8842_write16(adapter, 16, 0x8 | 0x20 | 0x40 | 0x80 | 0x400,
314 /* TX frame pointer autoincrement */
315 ks8842_write16(adapter, 17, 0x4000, REG_TXFDPR);
317 /* RX frame pointer autoincrement */
318 ks8842_write16(adapter, 17, 0x4000, REG_RXFDPR);
320 /* RX 2 kb high watermark */
321 ks8842_write16(adapter, 0, 0x1000, REG_QRFCR);
323 /* aggresive back off in half duplex */
324 ks8842_enable_bits(adapter, 32, 1 << 8, REG_SGCR1);
326 /* enable no excessive collison drop */
327 ks8842_enable_bits(adapter, 32, 1 << 3, REG_SGCR2);
329 /* Enable port 1 force flow control / back pressure / transmit / recv */
330 ks8842_write16(adapter, 48, 0x1E07, REG_P1CR2);
332 /* restart port auto-negotiation */
333 ks8842_enable_bits(adapter, 49, 1 << 13, REG_P1CR4);
335 /* Enable the transmitter */
336 ks8842_enable_tx(adapter);
338 /* Enable the receiver */
339 ks8842_enable_rx(adapter);
341 /* clear all interrupts */
342 ks8842_write16(adapter, 18, 0xffff, REG_ISR);
344 /* enable interrupts */
345 if (KS8842_USE_DMA(adapter)) {
346 /* When running in DMA Mode the RX interrupt is not enabled in
347 timberdale because RX data is received by DMA callbacks
348 it must still be enabled in the KS8842 because it indicates
349 to timberdale when there is RX data for it's DMA FIFOs */
350 iowrite16(ENABLED_IRQS_DMA_IP, adapter->hw_addr + REG_TIMB_IER);
351 ks8842_write16(adapter, 18, ENABLED_IRQS_DMA, REG_IER);
353 if (!(adapter->conf_flags & MICREL_KS884X))
354 iowrite16(ENABLED_IRQS,
355 adapter->hw_addr + REG_TIMB_IER);
356 ks8842_write16(adapter, 18, ENABLED_IRQS, REG_IER);
358 /* enable the switch */
359 ks8842_write16(adapter, 32, 0x1, REG_SW_ID_AND_ENABLE);
362 static void ks8842_read_mac_addr(struct ks8842_adapter *adapter, u8 *dest)
367 for (i = 0; i < ETH_ALEN; i++)
368 dest[ETH_ALEN - i - 1] = ks8842_read8(adapter, 2, REG_MARL + i);
370 if (adapter->conf_flags & MICREL_KS884X) {
372 the sequence of saving mac addr between MAC and Switch is
376 mac = ks8842_read16(adapter, 2, REG_MARL);
377 ks8842_write16(adapter, 39, mac, REG_MACAR3);
378 mac = ks8842_read16(adapter, 2, REG_MARM);
379 ks8842_write16(adapter, 39, mac, REG_MACAR2);
380 mac = ks8842_read16(adapter, 2, REG_MARH);
381 ks8842_write16(adapter, 39, mac, REG_MACAR1);
384 /* make sure the switch port uses the same MAC as the QMU */
385 mac = ks8842_read16(adapter, 2, REG_MARL);
386 ks8842_write16(adapter, 39, mac, REG_MACAR1);
387 mac = ks8842_read16(adapter, 2, REG_MARM);
388 ks8842_write16(adapter, 39, mac, REG_MACAR2);
389 mac = ks8842_read16(adapter, 2, REG_MARH);
390 ks8842_write16(adapter, 39, mac, REG_MACAR3);
394 static void ks8842_write_mac_addr(struct ks8842_adapter *adapter, u8 *mac)
399 spin_lock_irqsave(&adapter->lock, flags);
400 for (i = 0; i < ETH_ALEN; i++) {
401 ks8842_write8(adapter, 2, mac[ETH_ALEN - i - 1], REG_MARL + i);
402 if (!(adapter->conf_flags & MICREL_KS884X))
403 ks8842_write8(adapter, 39, mac[ETH_ALEN - i - 1],
407 if (adapter->conf_flags & MICREL_KS884X) {
409 the sequence of saving mac addr between MAC and Switch is
415 mac = ks8842_read16(adapter, 2, REG_MARL);
416 ks8842_write16(adapter, 39, mac, REG_MACAR3);
417 mac = ks8842_read16(adapter, 2, REG_MARM);
418 ks8842_write16(adapter, 39, mac, REG_MACAR2);
419 mac = ks8842_read16(adapter, 2, REG_MARH);
420 ks8842_write16(adapter, 39, mac, REG_MACAR1);
422 spin_unlock_irqrestore(&adapter->lock, flags);
425 static inline u16 ks8842_tx_fifo_space(struct ks8842_adapter *adapter)
427 return ks8842_read16(adapter, 16, REG_TXMIR) & 0x1fff;
430 static int ks8842_tx_frame_dma(struct sk_buff *skb, struct net_device *netdev)
432 struct ks8842_adapter *adapter = netdev_priv(netdev);
433 struct ks8842_tx_dma_ctl *ctl = &adapter->dma_tx;
437 netdev_dbg(netdev, "%s: TX ongoing\n", __func__);
438 /* transfer ongoing */
439 return NETDEV_TX_BUSY;
442 sg_dma_len(&ctl->sg) = skb->len + sizeof(u32);
444 /* copy data to the TX buffer */
445 /* the control word, enable IRQ, port 1 and the length */
447 *buf++ = 0x01; /* Port 1 */
448 *buf++ = skb->len & 0xff;
449 *buf++ = (skb->len >> 8) & 0xff;
450 skb_copy_from_linear_data(skb, buf, skb->len);
452 dma_sync_single_range_for_device(adapter->dev,
453 sg_dma_address(&ctl->sg), 0, sg_dma_len(&ctl->sg),
456 /* make sure the length is a multiple of 4 */
457 if (sg_dma_len(&ctl->sg) % 4)
458 sg_dma_len(&ctl->sg) += 4 - sg_dma_len(&ctl->sg) % 4;
460 ctl->adesc = ctl->chan->device->device_prep_slave_sg(ctl->chan,
461 &ctl->sg, 1, DMA_TO_DEVICE,
462 DMA_PREP_INTERRUPT | DMA_COMPL_SKIP_SRC_UNMAP);
464 return NETDEV_TX_BUSY;
466 ctl->adesc->callback_param = netdev;
467 ctl->adesc->callback = ks8842_dma_tx_cb;
468 ctl->adesc->tx_submit(ctl->adesc);
470 netdev->stats.tx_bytes += skb->len;
477 static int ks8842_tx_frame(struct sk_buff *skb, struct net_device *netdev)
479 struct ks8842_adapter *adapter = netdev_priv(netdev);
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));
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;
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;
498 iowrite16(*ptr16++, adapter->hw_addr + REG_QMU_DATA_LO);
499 iowrite16(*ptr16++, adapter->hw_addr + REG_QMU_DATA_HI);
504 u32 *ptr = (u32 *)skb->data;
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);
510 netdev->stats.tx_bytes += len;
514 iowrite32(*ptr, adapter->hw_addr + REG_QMU_DATA_LO);
521 ks8842_write16(adapter, 17, 1, REG_TXQCR);
528 static void ks8842_update_rx_err_counters(struct net_device *netdev, u32 status)
530 netdev_dbg(netdev, "RX error, status: %x\n", status);
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++;
541 static void ks8842_update_rx_counters(struct net_device *netdev, u32 status,
544 netdev_dbg(netdev, "RX packet, len: %d\n", len);
546 netdev->stats.rx_packets++;
547 netdev->stats.rx_bytes += len;
548 if (status & RXSR_MULTICAST)
549 netdev->stats.multicast++;
552 static int __ks8842_start_new_rx_dma(struct net_device *netdev)
554 struct ks8842_adapter *adapter = netdev_priv(netdev);
555 struct ks8842_rx_dma_ctl *ctl = &adapter->dma_rx;
556 struct scatterlist *sg = &ctl->sg;
559 ctl->skb = netdev_alloc_skb(netdev, DMA_BUFFER_SIZE);
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));
566 sg_dma_address(sg) = 0;
570 sg_dma_len(sg) = DMA_BUFFER_SIZE;
572 ctl->adesc = ctl->chan->device->device_prep_slave_sg(ctl->chan,
573 sg, 1, DMA_FROM_DEVICE,
574 DMA_PREP_INTERRUPT | DMA_COMPL_SKIP_SRC_UNMAP);
579 ctl->adesc->callback_param = netdev;
580 ctl->adesc->callback = ks8842_dma_rx_cb;
581 ctl->adesc->tx_submit(ctl->adesc);
584 sg_dma_address(sg) = 0;
590 if (sg_dma_address(sg))
591 dma_unmap_single(adapter->dev, sg_dma_address(sg),
592 DMA_BUFFER_SIZE, DMA_FROM_DEVICE);
593 sg_dma_address(sg) = 0;
595 dev_kfree_skb(ctl->skb);
599 printk(KERN_ERR DRV_NAME": Failed to start RX DMA: %d\n", err);
603 static void ks8842_rx_frame_dma_tasklet(unsigned long arg)
605 struct net_device *netdev = (struct net_device *)arg;
606 struct ks8842_adapter *adapter = netdev_priv(netdev);
607 struct ks8842_rx_dma_ctl *ctl = &adapter->dma_rx;
608 struct sk_buff *skb = ctl->skb;
609 dma_addr_t addr = sg_dma_address(&ctl->sg);
614 /* kick next transfer going */
615 __ks8842_start_new_rx_dma(netdev);
617 /* now handle the data we got */
618 dma_unmap_single(adapter->dev, addr, DMA_BUFFER_SIZE, DMA_FROM_DEVICE);
620 status = *((u32 *)skb->data);
622 netdev_dbg(netdev, "%s - rx_data: status: %x\n",
623 __func__, status & 0xffff);
625 /* check the status */
626 if ((status & RXSR_VALID) && !(status & RXSR_ERROR)) {
627 int len = (status >> 16) & 0x7ff;
629 ks8842_update_rx_counters(netdev, status, len);
631 /* reserve 4 bytes which is the status word */
635 skb->protocol = eth_type_trans(skb, netdev);
638 ks8842_update_rx_err_counters(netdev, status);
643 static void ks8842_rx_frame(struct net_device *netdev,
644 struct ks8842_adapter *adapter)
649 if (adapter->conf_flags & KS884X_16BIT) {
650 status = ks8842_read16(adapter, 17, REG_QMU_DATA_LO);
651 len = ks8842_read16(adapter, 17, REG_QMU_DATA_HI);
652 netdev_dbg(netdev, "%s - rx_data: status: %x\n",
655 status = ks8842_read32(adapter, 17, REG_QMU_DATA_LO);
656 len = (status >> 16) & 0x7ff;
658 netdev_dbg(netdev, "%s - rx_data: status: %x\n",
662 /* check the status */
663 if ((status & RXSR_VALID) && !(status & RXSR_ERROR)) {
664 struct sk_buff *skb = netdev_alloc_skb_ip_align(netdev, len);
668 ks8842_update_rx_counters(netdev, status, len);
670 if (adapter->conf_flags & KS884X_16BIT) {
671 u16 *data16 = (u16 *)skb_put(skb, len);
672 ks8842_select_bank(adapter, 17);
674 *data16++ = ioread16(adapter->hw_addr +
676 *data16++ = ioread16(adapter->hw_addr +
681 u32 *data = (u32 *)skb_put(skb, len);
683 ks8842_select_bank(adapter, 17);
685 *data++ = ioread32(adapter->hw_addr +
690 skb->protocol = eth_type_trans(skb, netdev);
693 netdev->stats.rx_dropped++;
695 ks8842_update_rx_err_counters(netdev, status);
697 /* set high watermark to 3K */
698 ks8842_clear_bits(adapter, 0, 1 << 12, REG_QRFCR);
700 /* release the frame */
701 ks8842_write16(adapter, 17, 0x01, REG_RXQCR);
703 /* set high watermark to 2K */
704 ks8842_enable_bits(adapter, 0, 1 << 12, REG_QRFCR);
707 void ks8842_handle_rx(struct net_device *netdev, struct ks8842_adapter *adapter)
709 u16 rx_data = ks8842_read16(adapter, 16, REG_RXMIR) & 0x1fff;
710 netdev_dbg(netdev, "%s Entry - rx_data: %d\n", __func__, rx_data);
712 ks8842_rx_frame(netdev, adapter);
713 rx_data = ks8842_read16(adapter, 16, REG_RXMIR) & 0x1fff;
717 void ks8842_handle_tx(struct net_device *netdev, struct ks8842_adapter *adapter)
719 u16 sr = ks8842_read16(adapter, 16, REG_TXSR);
720 netdev_dbg(netdev, "%s - entry, sr: %x\n", __func__, sr);
721 netdev->stats.tx_packets++;
722 if (netif_queue_stopped(netdev))
723 netif_wake_queue(netdev);
726 void ks8842_handle_rx_overrun(struct net_device *netdev,
727 struct ks8842_adapter *adapter)
729 netdev_dbg(netdev, "%s: entry\n", __func__);
730 netdev->stats.rx_errors++;
731 netdev->stats.rx_fifo_errors++;
734 void ks8842_tasklet(unsigned long arg)
736 struct net_device *netdev = (struct net_device *)arg;
737 struct ks8842_adapter *adapter = netdev_priv(netdev);
742 /* read current bank to be able to set it back */
743 spin_lock_irqsave(&adapter->lock, flags);
744 entry_bank = ioread16(adapter->hw_addr + REG_SELECT_BANK);
745 spin_unlock_irqrestore(&adapter->lock, flags);
747 isr = ks8842_read16(adapter, 18, REG_ISR);
748 netdev_dbg(netdev, "%s - ISR: 0x%x\n", __func__, isr);
750 /* when running in DMA mode, do not ack RX interrupts, it is handled
751 internally by timberdale, otherwise it's DMA FIFO:s would stop
753 if (KS8842_USE_DMA(adapter))
757 ks8842_write16(adapter, 18, isr, REG_ISR);
759 if (!(adapter->conf_flags & MICREL_KS884X))
760 /* Ack in the timberdale IP as well */
761 iowrite32(0x1, adapter->hw_addr + REG_TIMB_IAR);
763 if (!netif_running(netdev))
766 if (isr & IRQ_LINK_CHANGE)
767 ks8842_update_link_status(netdev, adapter);
769 /* should not get IRQ_RX when running DMA mode */
770 if (isr & (IRQ_RX | IRQ_RX_ERROR) && !KS8842_USE_DMA(adapter))
771 ks8842_handle_rx(netdev, adapter);
773 /* should only happen when in PIO mode */
775 ks8842_handle_tx(netdev, adapter);
777 if (isr & IRQ_RX_OVERRUN)
778 ks8842_handle_rx_overrun(netdev, adapter);
780 if (isr & IRQ_TX_STOPPED) {
781 ks8842_disable_tx(adapter);
782 ks8842_enable_tx(adapter);
785 if (isr & IRQ_RX_STOPPED) {
786 ks8842_disable_rx(adapter);
787 ks8842_enable_rx(adapter);
790 /* re-enable interrupts, put back the bank selection register */
791 spin_lock_irqsave(&adapter->lock, flags);
792 if (KS8842_USE_DMA(adapter))
793 ks8842_write16(adapter, 18, ENABLED_IRQS_DMA, REG_IER);
795 ks8842_write16(adapter, 18, ENABLED_IRQS, REG_IER);
796 iowrite16(entry_bank, adapter->hw_addr + REG_SELECT_BANK);
798 /* Make sure timberdale continues DMA operations, they are stopped while
799 we are handling the ks8842 because we might change bank */
800 if (KS8842_USE_DMA(adapter))
801 ks8842_resume_dma(adapter);
803 spin_unlock_irqrestore(&adapter->lock, flags);
806 static irqreturn_t ks8842_irq(int irq, void *devid)
808 struct net_device *netdev = devid;
809 struct ks8842_adapter *adapter = netdev_priv(netdev);
811 u16 entry_bank = ioread16(adapter->hw_addr + REG_SELECT_BANK);
812 irqreturn_t ret = IRQ_NONE;
814 isr = ks8842_read16(adapter, 18, REG_ISR);
815 netdev_dbg(netdev, "%s - ISR: 0x%x\n", __func__, isr);
818 if (KS8842_USE_DMA(adapter))
819 /* disable all but RX IRQ, since the FPGA relies on it*/
820 ks8842_write16(adapter, 18, IRQ_RX, REG_IER);
823 ks8842_write16(adapter, 18, 0x00, REG_IER);
825 /* schedule tasklet */
826 tasklet_schedule(&adapter->tasklet);
831 iowrite16(entry_bank, adapter->hw_addr + REG_SELECT_BANK);
833 /* After an interrupt, tell timberdale to continue DMA operations.
834 DMA is disabled while we are handling the ks8842 because we might
836 ks8842_resume_dma(adapter);
841 static void ks8842_dma_rx_cb(void *data)
843 struct net_device *netdev = data;
844 struct ks8842_adapter *adapter = netdev_priv(netdev);
846 netdev_dbg(netdev, "RX DMA finished\n");
847 /* schedule tasklet */
848 if (adapter->dma_rx.adesc)
849 tasklet_schedule(&adapter->dma_rx.tasklet);
852 static void ks8842_dma_tx_cb(void *data)
854 struct net_device *netdev = data;
855 struct ks8842_adapter *adapter = netdev_priv(netdev);
856 struct ks8842_tx_dma_ctl *ctl = &adapter->dma_tx;
858 netdev_dbg(netdev, "TX DMA finished\n");
863 netdev->stats.tx_packets++;
866 if (netif_queue_stopped(netdev))
867 netif_wake_queue(netdev);
870 static void ks8842_stop_dma(struct ks8842_adapter *adapter)
872 struct ks8842_tx_dma_ctl *tx_ctl = &adapter->dma_tx;
873 struct ks8842_rx_dma_ctl *rx_ctl = &adapter->dma_rx;
875 tx_ctl->adesc = NULL;
877 tx_ctl->chan->device->device_control(tx_ctl->chan,
878 DMA_TERMINATE_ALL, 0);
880 rx_ctl->adesc = NULL;
882 rx_ctl->chan->device->device_control(rx_ctl->chan,
883 DMA_TERMINATE_ALL, 0);
885 if (sg_dma_address(&rx_ctl->sg))
886 dma_unmap_single(adapter->dev, sg_dma_address(&rx_ctl->sg),
887 DMA_BUFFER_SIZE, DMA_FROM_DEVICE);
888 sg_dma_address(&rx_ctl->sg) = 0;
890 dev_kfree_skb(rx_ctl->skb);
894 static void ks8842_dealloc_dma_bufs(struct ks8842_adapter *adapter)
896 struct ks8842_tx_dma_ctl *tx_ctl = &adapter->dma_tx;
897 struct ks8842_rx_dma_ctl *rx_ctl = &adapter->dma_rx;
899 ks8842_stop_dma(adapter);
902 dma_release_channel(tx_ctl->chan);
906 dma_release_channel(rx_ctl->chan);
909 tasklet_kill(&rx_ctl->tasklet);
911 if (sg_dma_address(&tx_ctl->sg))
912 dma_unmap_single(adapter->dev, sg_dma_address(&tx_ctl->sg),
913 DMA_BUFFER_SIZE, DMA_TO_DEVICE);
914 sg_dma_address(&tx_ctl->sg) = 0;
920 static bool ks8842_dma_filter_fn(struct dma_chan *chan, void *filter_param)
922 return chan->chan_id == (long)filter_param;
925 static int ks8842_alloc_dma_bufs(struct net_device *netdev)
927 struct ks8842_adapter *adapter = netdev_priv(netdev);
928 struct ks8842_tx_dma_ctl *tx_ctl = &adapter->dma_tx;
929 struct ks8842_rx_dma_ctl *rx_ctl = &adapter->dma_rx;
935 dma_cap_set(DMA_SLAVE, mask);
936 dma_cap_set(DMA_PRIVATE, mask);
938 sg_init_table(&tx_ctl->sg, 1);
940 tx_ctl->chan = dma_request_channel(mask, ks8842_dma_filter_fn,
941 (void *)(long)tx_ctl->channel);
947 /* allocate DMA buffer */
948 tx_ctl->buf = kmalloc(DMA_BUFFER_SIZE, GFP_KERNEL);
954 sg_dma_address(&tx_ctl->sg) = dma_map_single(adapter->dev,
955 tx_ctl->buf, DMA_BUFFER_SIZE, DMA_TO_DEVICE);
956 err = dma_mapping_error(adapter->dev,
957 sg_dma_address(&tx_ctl->sg));
959 sg_dma_address(&tx_ctl->sg) = 0;
963 rx_ctl->chan = dma_request_channel(mask, ks8842_dma_filter_fn,
964 (void *)(long)rx_ctl->channel);
970 tasklet_init(&rx_ctl->tasklet, ks8842_rx_frame_dma_tasklet,
971 (unsigned long)netdev);
975 ks8842_dealloc_dma_bufs(adapter);
979 /* Netdevice operations */
981 static int ks8842_open(struct net_device *netdev)
983 struct ks8842_adapter *adapter = netdev_priv(netdev);
986 netdev_dbg(netdev, "%s - entry\n", __func__);
988 if (KS8842_USE_DMA(adapter)) {
989 err = ks8842_alloc_dma_bufs(netdev);
993 err = __ks8842_start_new_rx_dma(netdev);
995 ks8842_dealloc_dma_bufs(adapter);
999 printk(KERN_WARNING DRV_NAME
1000 ": Failed to initiate DMA, running PIO\n");
1001 ks8842_dealloc_dma_bufs(adapter);
1002 adapter->dma_rx.channel = -1;
1003 adapter->dma_tx.channel = -1;
1008 ks8842_reset_hw(adapter);
1010 ks8842_write_mac_addr(adapter, netdev->dev_addr);
1012 ks8842_update_link_status(netdev, adapter);
1014 err = request_irq(adapter->irq, ks8842_irq, IRQF_SHARED, DRV_NAME,
1017 pr_err("Failed to request IRQ: %d: %d\n", adapter->irq, err);
1024 static int ks8842_close(struct net_device *netdev)
1026 struct ks8842_adapter *adapter = netdev_priv(netdev);
1028 netdev_dbg(netdev, "%s - entry\n", __func__);
1030 cancel_work_sync(&adapter->timeout_work);
1032 if (KS8842_USE_DMA(adapter))
1033 ks8842_dealloc_dma_bufs(adapter);
1036 free_irq(adapter->irq, netdev);
1038 /* disable the switch */
1039 ks8842_write16(adapter, 32, 0x0, REG_SW_ID_AND_ENABLE);
1044 static netdev_tx_t ks8842_xmit_frame(struct sk_buff *skb,
1045 struct net_device *netdev)
1048 struct ks8842_adapter *adapter = netdev_priv(netdev);
1050 netdev_dbg(netdev, "%s: entry\n", __func__);
1052 if (KS8842_USE_DMA(adapter)) {
1053 unsigned long flags;
1054 ret = ks8842_tx_frame_dma(skb, netdev);
1055 /* for now only allow one transfer at the time */
1056 spin_lock_irqsave(&adapter->lock, flags);
1057 if (adapter->dma_tx.adesc)
1058 netif_stop_queue(netdev);
1059 spin_unlock_irqrestore(&adapter->lock, flags);
1063 ret = ks8842_tx_frame(skb, netdev);
1065 if (ks8842_tx_fifo_space(adapter) < netdev->mtu + 8)
1066 netif_stop_queue(netdev);
1071 static int ks8842_set_mac(struct net_device *netdev, void *p)
1073 struct ks8842_adapter *adapter = netdev_priv(netdev);
1074 struct sockaddr *addr = p;
1075 char *mac = (u8 *)addr->sa_data;
1077 netdev_dbg(netdev, "%s: entry\n", __func__);
1079 if (!is_valid_ether_addr(addr->sa_data))
1080 return -EADDRNOTAVAIL;
1082 memcpy(netdev->dev_addr, mac, netdev->addr_len);
1084 ks8842_write_mac_addr(adapter, mac);
1088 static void ks8842_tx_timeout_work(struct work_struct *work)
1090 struct ks8842_adapter *adapter =
1091 container_of(work, struct ks8842_adapter, timeout_work);
1092 struct net_device *netdev = adapter->netdev;
1093 unsigned long flags;
1095 netdev_dbg(netdev, "%s: entry\n", __func__);
1097 spin_lock_irqsave(&adapter->lock, flags);
1099 if (KS8842_USE_DMA(adapter))
1100 ks8842_stop_dma(adapter);
1102 /* disable interrupts */
1103 ks8842_write16(adapter, 18, 0, REG_IER);
1104 ks8842_write16(adapter, 18, 0xFFFF, REG_ISR);
1106 netif_stop_queue(netdev);
1108 spin_unlock_irqrestore(&adapter->lock, flags);
1110 ks8842_reset_hw(adapter);
1112 ks8842_write_mac_addr(adapter, netdev->dev_addr);
1114 ks8842_update_link_status(netdev, adapter);
1116 if (KS8842_USE_DMA(adapter))
1117 __ks8842_start_new_rx_dma(netdev);
1120 static void ks8842_tx_timeout(struct net_device *netdev)
1122 struct ks8842_adapter *adapter = netdev_priv(netdev);
1124 netdev_dbg(netdev, "%s: entry\n", __func__);
1126 schedule_work(&adapter->timeout_work);
1129 static const struct net_device_ops ks8842_netdev_ops = {
1130 .ndo_open = ks8842_open,
1131 .ndo_stop = ks8842_close,
1132 .ndo_start_xmit = ks8842_xmit_frame,
1133 .ndo_set_mac_address = ks8842_set_mac,
1134 .ndo_tx_timeout = ks8842_tx_timeout,
1135 .ndo_validate_addr = eth_validate_addr
1138 static const struct ethtool_ops ks8842_ethtool_ops = {
1139 .get_link = ethtool_op_get_link,
1142 static int __devinit ks8842_probe(struct platform_device *pdev)
1145 struct resource *iomem;
1146 struct net_device *netdev;
1147 struct ks8842_adapter *adapter;
1148 struct ks8842_platform_data *pdata = pdev->dev.platform_data;
1152 iomem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1153 if (!request_mem_region(iomem->start, resource_size(iomem), DRV_NAME))
1154 goto err_mem_region;
1156 netdev = alloc_etherdev(sizeof(struct ks8842_adapter));
1158 goto err_alloc_etherdev;
1160 SET_NETDEV_DEV(netdev, &pdev->dev);
1162 adapter = netdev_priv(netdev);
1163 adapter->netdev = netdev;
1164 INIT_WORK(&adapter->timeout_work, ks8842_tx_timeout_work);
1165 adapter->hw_addr = ioremap(iomem->start, resource_size(iomem));
1166 adapter->conf_flags = iomem->flags;
1168 if (!adapter->hw_addr)
1171 adapter->irq = platform_get_irq(pdev, 0);
1172 if (adapter->irq < 0) {
1177 adapter->dev = (pdev->dev.parent) ? pdev->dev.parent : &pdev->dev;
1179 /* DMA is only supported when accessed via timberdale */
1180 if (!(adapter->conf_flags & MICREL_KS884X) && pdata &&
1181 (pdata->tx_dma_channel != -1) &&
1182 (pdata->rx_dma_channel != -1)) {
1183 adapter->dma_rx.channel = pdata->rx_dma_channel;
1184 adapter->dma_tx.channel = pdata->tx_dma_channel;
1186 adapter->dma_rx.channel = -1;
1187 adapter->dma_tx.channel = -1;
1190 tasklet_init(&adapter->tasklet, ks8842_tasklet, (unsigned long)netdev);
1191 spin_lock_init(&adapter->lock);
1193 netdev->netdev_ops = &ks8842_netdev_ops;
1194 netdev->ethtool_ops = &ks8842_ethtool_ops;
1196 /* Check if a mac address was given */
1197 i = netdev->addr_len;
1199 for (i = 0; i < netdev->addr_len; i++)
1200 if (pdata->macaddr[i] != 0)
1203 if (i < netdev->addr_len)
1204 /* an address was passed, use it */
1205 memcpy(netdev->dev_addr, pdata->macaddr,
1209 if (i == netdev->addr_len) {
1210 ks8842_read_mac_addr(adapter, netdev->dev_addr);
1212 if (!is_valid_ether_addr(netdev->dev_addr))
1213 random_ether_addr(netdev->dev_addr);
1216 id = ks8842_read16(adapter, 32, REG_SW_ID_AND_ENABLE);
1218 strcpy(netdev->name, "eth%d");
1219 err = register_netdev(netdev);
1223 platform_set_drvdata(pdev, netdev);
1225 pr_info("Found chip, family: 0x%x, id: 0x%x, rev: 0x%x\n",
1226 (id >> 8) & 0xff, (id >> 4) & 0xf, (id >> 1) & 0x7);
1232 iounmap(adapter->hw_addr);
1234 free_netdev(netdev);
1236 release_mem_region(iomem->start, resource_size(iomem));
1241 static int __devexit ks8842_remove(struct platform_device *pdev)
1243 struct net_device *netdev = platform_get_drvdata(pdev);
1244 struct ks8842_adapter *adapter = netdev_priv(netdev);
1245 struct resource *iomem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1247 unregister_netdev(netdev);
1248 tasklet_kill(&adapter->tasklet);
1249 iounmap(adapter->hw_addr);
1250 free_netdev(netdev);
1251 release_mem_region(iomem->start, resource_size(iomem));
1252 platform_set_drvdata(pdev, NULL);
1257 static struct platform_driver ks8842_platform_driver = {
1260 .owner = THIS_MODULE,
1262 .probe = ks8842_probe,
1263 .remove = ks8842_remove,
1266 static int __init ks8842_init(void)
1268 return platform_driver_register(&ks8842_platform_driver);
1271 static void __exit ks8842_exit(void)
1273 platform_driver_unregister(&ks8842_platform_driver);
1276 module_init(ks8842_init);
1277 module_exit(ks8842_exit);
1279 MODULE_DESCRIPTION("Timberdale KS8842 ethernet driver");
1280 MODULE_AUTHOR("Mocean Laboratories <info@mocean-labs.com>");
1281 MODULE_LICENSE("GPL v2");
1282 MODULE_ALIAS("platform:ks8842");