fp@2589: /**
fp@2589:     Network Driver for Beckhoff CCAT communication controller
fp@2589:     Copyright (C) 2014  Beckhoff Automation GmbH
fp@2589:     Author: Patrick Bruenn <p.bruenn@beckhoff.com>
fp@2589: 
fp@2589:     This program is free software; you can redistribute it and/or modify
fp@2589:     it under the terms of the GNU General Public License as published by
fp@2589:     the Free Software Foundation; either version 2 of the License, or
fp@2589:     (at your option) any later version.
fp@2589: 
fp@2589:     This program is distributed in the hope that it will be useful,
fp@2589:     but WITHOUT ANY WARRANTY; without even the implied warranty of
fp@2589:     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
fp@2589:     GNU General Public License for more details.
fp@2589: 
fp@2589:     You should have received a copy of the GNU General Public License along
fp@2589:     with this program; if not, write to the Free Software Foundation, Inc.,
fp@2589:     51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
fp@2589: */
fp@2589: 
fp@2589: #include <linux/etherdevice.h>
fp@2589: #include <linux/kernel.h>
fp@2589: #include <linux/module.h>
fp@2589: #include <linux/netdevice.h>
fp@2589: 
fp@2589: #include "module.h"
fp@2589: #include "netdev.h"
fp@2589: 
fp@2589: /**
fp@2589:  * EtherCAT frame to enable forwarding on EtherCAT Terminals
fp@2589:  */
fp@2589: static const u8 frameForwardEthernetFrames[] = {
fp@2589: 	0x01, 0x01, 0x05, 0x01, 0x00, 0x00,
fp@2589: 	0x00, 0x1b, 0x21, 0x36, 0x1b, 0xce,
fp@2589: 	0x88, 0xa4, 0x0e, 0x10,
fp@2589: 	0x08,
fp@2589: 	0x00,
fp@2589: 	0x00, 0x00,
fp@2589: 	0x00, 0x01,
fp@2589: 	0x02, 0x00,
fp@2589: 	0x00, 0x00,
fp@2589: 	0x00, 0x00,
fp@2589: 	0x00, 0x00
fp@2589: };
fp@2589: 
fp@2589: #define FIFO_LENGTH 64
fp@2589: #define POLL_TIME ktime_set(0, 100 * NSEC_PER_USEC)
fp@2589: 
fp@2589: /**
fp@2589:  * Helper to check if frame in tx dma memory was already marked as sent by CCAT
fp@2589:  */
fp@2589: static inline bool ccat_eth_frame_sent(const struct ccat_eth_frame *const frame)
fp@2589: {
fp@2589: 	return le32_to_cpu(frame->tx_flags) & CCAT_FRAME_SENT;
fp@2589: }
fp@2589: 
fp@2589: /**
fp@2589:  * Helper to check if frame in tx dma memory was already marked as sent by CCAT
fp@2589:  */
fp@2589: static inline bool ccat_eth_frame_received(const struct ccat_eth_frame *const
fp@2589: 					   frame)
fp@2589: {
fp@2589: 	return le32_to_cpu(frame->rx_flags) & CCAT_FRAME_RECEIVED;
fp@2589: }
fp@2589: 
fp@2589: static void ecdev_kfree_skb_any(struct sk_buff *skb)
fp@2589: {
fp@2589: 	/* never release a skb in EtherCAT mode */
fp@2589: }
fp@2589: 
fp@2589: static bool ecdev_carrier_ok(const struct net_device *const netdev)
fp@2589: {
fp@2589: 	struct ccat_eth_priv *const priv = netdev_priv(netdev);
fp@2589: 	return ecdev_get_link(priv->ecdev);
fp@2589: }
fp@2589: 
fp@2589: static void ecdev_carrier_on(struct net_device *const netdev)
fp@2589: {
fp@2589: 	struct ccat_eth_priv *const priv = netdev_priv(netdev);
fp@2589: 	ecdev_set_link(priv->ecdev, 1);
fp@2589: }
fp@2589: 
fp@2589: static void ecdev_carrier_off(struct net_device *const netdev)
fp@2589: {
fp@2589: 	struct ccat_eth_priv *const priv = netdev_priv(netdev);
fp@2589: 	ecdev_set_link(priv->ecdev, 0);
fp@2589: }
fp@2589: 
fp@2589: static void ecdev_nop(struct net_device *const netdev)
fp@2589: {
fp@2589: 	/* dummy called if nothing has to be done in EtherCAT operation mode */
fp@2589: }
fp@2589: 
fp@2589: static void unregister_ecdev(struct net_device *const netdev)
fp@2589: {
fp@2589: 	struct ccat_eth_priv *const priv = netdev_priv(netdev);
fp@2589: 	ecdev_close(priv->ecdev);
fp@2589: 	ecdev_withdraw(priv->ecdev);
fp@2589: }
fp@2589: 
fp@2589: static void ccat_eth_fifo_inc(struct ccat_eth_dma_fifo *fifo)
fp@2589: {
fp@2589: 	if (++fifo->next >= fifo->end)
fp@2589: 		fifo->next = fifo->dma.virt;
fp@2589: }
fp@2589: 
fp@2589: typedef void (*fifo_add_function) (struct ccat_eth_dma_fifo *,
fp@2589: 				   struct ccat_eth_frame *);
fp@2589: 
fp@2589: static void ccat_eth_rx_fifo_add(struct ccat_eth_dma_fifo *fifo,
fp@2589: 				 struct ccat_eth_frame *frame)
fp@2589: {
fp@2589: 	const size_t offset = ((void *)(frame) - fifo->dma.virt);
fp@2589: 	const u32 addr_and_length = (1 << 31) | offset;
fp@2589: 
fp@2589: 	frame->rx_flags = cpu_to_le32(0);
fp@2589: 	iowrite32(addr_and_length, fifo->reg);
fp@2589: }
fp@2589: 
fp@2589: static void ccat_eth_tx_fifo_add_free(struct ccat_eth_dma_fifo *fifo,
fp@2589: 				      struct ccat_eth_frame *frame)
fp@2589: {
fp@2589: 	/* mark frame as ready to use for tx */
fp@2589: 	frame->tx_flags = cpu_to_le32(CCAT_FRAME_SENT);
fp@2589: }
fp@2589: 
fp@2589: static void ccat_eth_dma_fifo_reset(struct ccat_eth_dma_fifo *fifo)
fp@2589: {
fp@2589: 	/* reset hw fifo */
fp@2589: 	iowrite32(0, fifo->reg + 0x8);
fp@2589: 	wmb();
fp@2589: 
fp@2589: 	if (fifo->add) {
fp@2589: 		fifo->next = fifo->dma.virt;
fp@2589: 		do {
fp@2589: 			fifo->add(fifo, fifo->next);
fp@2589: 			ccat_eth_fifo_inc(fifo);
fp@2589: 		} while (fifo->next != fifo->dma.virt);
fp@2589: 	}
fp@2589: }
fp@2589: 
fp@2589: static int ccat_eth_dma_fifo_init(struct ccat_eth_dma_fifo *fifo,
fp@2589: 				  void __iomem * const fifo_reg,
fp@2589: 				  fifo_add_function add, size_t channel,
fp@2589: 				  struct ccat_eth_priv *const priv)
fp@2589: {
fp@2589: 	if (0 !=
fp@2589: 	    ccat_dma_init(&fifo->dma, channel, priv->ccatdev->bar[2].ioaddr,
fp@2589: 			  &priv->ccatdev->pdev->dev)) {
fp@2589: 		pr_info("init DMA%llu memory failed.\n", (u64) channel);
fp@2589: 		return -1;
fp@2589: 	}
fp@2589: 	fifo->add = add;
fp@2589: 	fifo->end = ((struct ccat_eth_frame *)fifo->dma.virt) + FIFO_LENGTH;
fp@2589: 	fifo->reg = fifo_reg;
fp@2589: 	return 0;
fp@2589: }
fp@2589: 
fp@2589: /**
fp@2589:  * Stop both (Rx/Tx) DMA fifo's and free related management structures
fp@2589:  */
fp@2589: static void ccat_eth_priv_free_dma(struct ccat_eth_priv *priv)
fp@2589: {
fp@2589: 	/* reset hw fifo's */
fp@2589: 	iowrite32(0, priv->rx_fifo.reg + 0x8);
fp@2589: 	iowrite32(0, priv->tx_fifo.reg + 0x8);
fp@2589: 	wmb();
fp@2589: 
fp@2589: 	/* release dma */
fp@2589: 	ccat_dma_free(&priv->rx_fifo.dma);
fp@2589: 	ccat_dma_free(&priv->tx_fifo.dma);
fp@2589: }
fp@2589: 
fp@2589: /**
fp@2589:  * Initalizes both (Rx/Tx) DMA fifo's and related management structures
fp@2589:  */
fp@2589: static int ccat_eth_priv_init_dma(struct ccat_eth_priv *priv)
fp@2589: {
fp@2589: 	if (ccat_eth_dma_fifo_init
fp@2589: 	    (&priv->rx_fifo, priv->reg.rx_fifo, ccat_eth_rx_fifo_add,
fp@2589: 	     priv->info.rx_dma_chan, priv)) {
fp@2589: 		pr_warn("init Rx DMA fifo failed.\n");
fp@2589: 		return -1;
fp@2589: 	}
fp@2589: 
fp@2589: 	if (ccat_eth_dma_fifo_init
fp@2589: 	    (&priv->tx_fifo, priv->reg.tx_fifo, ccat_eth_tx_fifo_add_free,
fp@2589: 	     priv->info.tx_dma_chan, priv)) {
fp@2589: 		pr_warn("init Tx DMA fifo failed.\n");
fp@2589: 		ccat_dma_free(&priv->rx_fifo.dma);
fp@2589: 		return -1;
fp@2589: 	}
fp@2589: 
fp@2589: 	/* disable MAC filter */
fp@2589: 	iowrite8(0, priv->reg.mii + 0x8 + 6);
fp@2589: 	wmb();
fp@2589: 	return 0;
fp@2589: }
fp@2589: 
fp@2589: /**
fp@2589:  * Initializes the CCat... members of the ccat_eth_priv structure.
fp@2589:  * Call this function only if info and ioaddr are already initialized!
fp@2589:  */
fp@2589: static void ccat_eth_priv_init_mappings(struct ccat_eth_priv *priv)
fp@2589: {
fp@2589: 	struct ccat_mac_infoblock offsets;
fp@2589: 	void __iomem *const func_base =
fp@2589: 	    priv->ccatdev->bar[0].ioaddr + priv->info.addr;
fp@2589: 
fp@2589: 	memcpy_fromio(&offsets, func_base, sizeof(offsets));
fp@2589: 	priv->reg.mii = func_base + offsets.mii;
fp@2589: 	priv->reg.tx_fifo = func_base + offsets.tx_fifo;
fp@2589: 	priv->reg.rx_fifo = func_base + offsets.tx_fifo + 0x10;
fp@2589: 	priv->reg.mac = func_base + offsets.mac;
fp@2589: 	priv->reg.rx_mem = func_base + offsets.rx_mem;
fp@2589: 	priv->reg.tx_mem = func_base + offsets.tx_mem;
fp@2589: 	priv->reg.misc = func_base + offsets.misc;
fp@2589: }
fp@2589: 
fp@2589: static netdev_tx_t ccat_eth_start_xmit(struct sk_buff *skb,
fp@2589: 				       struct net_device *dev)
fp@2589: {
fp@2589: 	struct ccat_eth_priv *const priv = netdev_priv(dev);
fp@2589: 	struct ccat_eth_dma_fifo *const fifo = &priv->tx_fifo;
fp@2589: 	u32 addr_and_length;
fp@2589: 
fp@2589: 	if (skb_is_nonlinear(skb)) {
fp@2589: 		pr_warn("Non linear skb not supported -> drop frame.\n");
fp@2589: 		atomic64_inc(&priv->tx_dropped);
fp@2589: 		priv->kfree_skb_any(skb);
fp@2589: 		return NETDEV_TX_OK;
fp@2589: 	}
fp@2589: 
fp@2589: 	if (skb->len > sizeof(fifo->next->data)) {
fp@2589: 		pr_warn("skb.len %llu exceeds dma buffer %llu -> drop frame.\n",
fp@2589: 			(u64) skb->len, (u64) sizeof(fifo->next->data));
fp@2589: 		atomic64_inc(&priv->tx_dropped);
fp@2589: 		priv->kfree_skb_any(skb);
fp@2589: 		return NETDEV_TX_OK;
fp@2589: 	}
fp@2589: 
fp@2589: 	if (!ccat_eth_frame_sent(fifo->next)) {
fp@2589: 		netdev_err(dev, "BUG! Tx Ring full when queue awake!\n");
fp@2589: 		priv->stop_queue(priv->netdev);
fp@2589: 		return NETDEV_TX_BUSY;
fp@2589: 	}
fp@2589: 
fp@2589: 	/* prepare frame in DMA memory */
fp@2589: 	fifo->next->tx_flags = cpu_to_le32(0);
fp@2589: 	fifo->next->length = cpu_to_le16(skb->len);
fp@2589: 	memcpy(fifo->next->data, skb->data, skb->len);
fp@2589: 
fp@2589: 	/* Queue frame into CCAT TX-FIFO, CCAT ignores the first 8 bytes of the tx descriptor */
fp@2589: 	addr_and_length = offsetof(struct ccat_eth_frame, length);
fp@2589: 	addr_and_length += ((void *)fifo->next - fifo->dma.virt);
fp@2589: 	addr_and_length += ((skb->len + CCAT_ETH_FRAME_HEAD_LEN) / 8) << 24;
fp@2589: 	iowrite32(addr_and_length, priv->reg.tx_fifo);
fp@2589: 
fp@2589: 	/* update stats */
fp@2589: 	atomic64_add(skb->len, &priv->tx_bytes);
fp@2589: 
fp@2589: 	priv->kfree_skb_any(skb);
fp@2589: 
fp@2589: 	ccat_eth_fifo_inc(fifo);
fp@2589: 	/* stop queue if tx ring is full */
fp@2589: 	if (!ccat_eth_frame_sent(fifo->next)) {
fp@2589: 		priv->stop_queue(priv->netdev);
fp@2589: 	}
fp@2589: 	return NETDEV_TX_OK;
fp@2589: }
fp@2589: 
fp@2589: /**
fp@2589:  * Function to transmit a raw buffer to the network (f.e. frameForwardEthernetFrames)
fp@2589:  * @dev a valid net_device
fp@2589:  * @data pointer to your raw buffer
fp@2589:  * @len number of bytes in the raw buffer to transmit
fp@2589:  */
fp@2589: static void ccat_eth_xmit_raw(struct net_device *dev, const char *const data,
fp@2589: 			      size_t len)
fp@2589: {
fp@2589: 	struct sk_buff *skb = dev_alloc_skb(len);
fp@2589: 
fp@2589: 	skb->dev = dev;
fp@2589: 	skb_copy_to_linear_data(skb, data, len);
fp@2589: 	skb_put(skb, len);
fp@2589: 	ccat_eth_start_xmit(skb, dev);
fp@2589: }
fp@2589: 
fp@2589: static void ccat_eth_receive(struct net_device *const dev,
fp@2589: 			     const void *const data, const size_t len)
fp@2589: {
fp@2589: 	struct sk_buff *const skb = dev_alloc_skb(len + NET_IP_ALIGN);
fp@2589: 	struct ccat_eth_priv *const priv = netdev_priv(dev);
fp@2589: 
fp@2589: 	if (!skb) {
fp@2589: 		pr_info("%s() out of memory :-(\n", __FUNCTION__);
fp@2589: 		atomic64_inc(&priv->rx_dropped);
fp@2589: 		return;
fp@2589: 	}
fp@2589: 	skb->dev = dev;
fp@2589: 	skb_reserve(skb, NET_IP_ALIGN);
fp@2589: 	skb_copy_to_linear_data(skb, data, len);
fp@2589: 	skb_put(skb, len);
fp@2589: 	skb->protocol = eth_type_trans(skb, dev);
fp@2589: 	skb->ip_summed = CHECKSUM_UNNECESSARY;
fp@2589: 	atomic64_add(len, &priv->rx_bytes);
fp@2589: 	netif_rx(skb);
fp@2589: }
fp@2589: 
fp@2589: static void ccat_eth_link_down(struct net_device *const dev)
fp@2589: {
fp@2589: 	struct ccat_eth_priv *const priv = netdev_priv(dev);
fp@2589: 
fp@2589: 	priv->stop_queue(dev);
fp@2589: 	priv->carrier_off(dev);
fp@2589: 	netdev_info(dev, "NIC Link is Down\n");
fp@2589: }
fp@2589: 
fp@2589: static void ccat_eth_link_up(struct net_device *const dev)
fp@2589: {
fp@2589: 	struct ccat_eth_priv *const priv = netdev_priv(dev);
fp@2589: 
fp@2589: 	netdev_info(dev, "NIC Link is Up\n");
fp@2589: 	/* TODO netdev_info(dev, "NIC Link is Up %u Mbps %s Duplex\n",
fp@2589: 	   speed == SPEED_100 ? 100 : 10,
fp@2589: 	   cmd.duplex == DUPLEX_FULL ? "Full" : "Half"); */
fp@2589: 
fp@2589: 	ccat_eth_dma_fifo_reset(&priv->rx_fifo);
fp@2589: 	ccat_eth_dma_fifo_reset(&priv->tx_fifo);
fp@2589: 
fp@2589: 	/* TODO reset CCAT MAC register */
fp@2589: 
fp@2589: 	ccat_eth_xmit_raw(dev, frameForwardEthernetFrames,
fp@2589: 			  sizeof(frameForwardEthernetFrames));
fp@2589: 	priv->carrier_on(dev);
fp@2589: 	priv->start_queue(dev);
fp@2589: }
fp@2589: 
fp@2589: /**
fp@2589:  * Read link state from CCAT hardware
fp@2589:  * @return 1 if link is up, 0 if not
fp@2589:  */
fp@2589: inline static size_t ccat_eth_priv_read_link_state(const struct ccat_eth_priv
fp@2589: 						   *const priv)
fp@2589: {
fp@2589: 	return (1 << 24) == (ioread32(priv->reg.mii + 0x8 + 4) & (1 << 24));
fp@2589: }
fp@2589: 
fp@2589: /**
fp@2589:  * Poll for link state changes
fp@2589:  */
fp@2589: static void poll_link(struct ccat_eth_priv *const priv)
fp@2589: {
fp@2589: 	const size_t link = ccat_eth_priv_read_link_state(priv);
fp@2589: 
fp@2589: 	if (link != priv->carrier_ok(priv->netdev)) {
fp@2589: 		if (link)
fp@2589: 			ccat_eth_link_up(priv->netdev);
fp@2589: 		else
fp@2589: 			ccat_eth_link_down(priv->netdev);
fp@2589: 	}
fp@2589: }
fp@2589: 
fp@2589: /**
fp@2589:  * Poll for available rx dma descriptors in ethernet operating mode
fp@2589:  */
fp@2589: static void poll_rx(struct ccat_eth_priv *const priv)
fp@2589: {
fp@2589: 	static const size_t overhead = CCAT_ETH_FRAME_HEAD_LEN - 4;
fp@2589: 	struct ccat_eth_dma_fifo *const fifo = &priv->rx_fifo;
fp@2589: 
fp@2589: 	/* TODO omit possible deadlock in situations with heavy traffic */
fp@2589: 	while (ccat_eth_frame_received(fifo->next)) {
fp@2589: 		const size_t len = le16_to_cpu(fifo->next->length) - overhead;
fp@2589: 		if (priv->ecdev) {
fp@2589: 			ecdev_receive(priv->ecdev, fifo->next->data, len);
fp@2589: 		} else {
fp@2589: 			ccat_eth_receive(priv->netdev, fifo->next->data, len);
fp@2589: 		}
fp@2589: 		ccat_eth_rx_fifo_add(fifo, fifo->next);
fp@2589: 		ccat_eth_fifo_inc(fifo);
fp@2589: 	}
fp@2589: }
fp@2589: 
fp@2589: static void ec_poll_rx(struct net_device *dev)
fp@2589: {
fp@2589: 	struct ccat_eth_priv *const priv = netdev_priv(dev);
fp@2589: 	poll_rx(priv);
fp@2589: }
fp@2589: 
fp@2589: /**
fp@2589:  * Poll for available tx dma descriptors in ethernet operating mode
fp@2589:  */
fp@2589: static void poll_tx(struct ccat_eth_priv *const priv)
fp@2589: {
fp@2589: 	if (ccat_eth_frame_sent(priv->tx_fifo.next)) {
fp@2589: 		netif_wake_queue(priv->netdev);
fp@2589: 	}
fp@2589: }
fp@2589: 
fp@2589: /**
fp@2589:  * Since CCAT doesn't support interrupts until now, we have to poll
fp@2589:  * some status bits to recognize things like link change etc.
fp@2589:  */
fp@2589: static enum hrtimer_restart poll_timer_callback(struct hrtimer *timer)
fp@2589: {
fp@2589: 	struct ccat_eth_priv *const priv =
fp@2589: 	    container_of(timer, struct ccat_eth_priv, poll_timer);
fp@2589: 
fp@2589: 	poll_link(priv);
fp@2589: 	if(!priv->ecdev) {
fp@2589: 		poll_rx(priv);
fp@2589: 		poll_tx(priv);
fp@2589: 	}
fp@2589: 	hrtimer_forward_now(timer, POLL_TIME);
fp@2589: 	return HRTIMER_RESTART;
fp@2589: }
fp@2589: 
fp@2589: static struct rtnl_link_stats64 *ccat_eth_get_stats64(struct net_device *dev, struct rtnl_link_stats64
fp@2589: 						      *storage)
fp@2589: {
fp@2589: 	struct ccat_eth_priv *const priv = netdev_priv(dev);
fp@2589: 	struct ccat_mac_register mac;
fp@2589: 	memcpy_fromio(&mac, priv->reg.mac, sizeof(mac));
fp@2589: 	storage->rx_packets = mac.rx_frames;	/* total packets received       */
fp@2589: 	storage->tx_packets = mac.tx_frames;	/* total packets transmitted    */
fp@2589: 	storage->rx_bytes = atomic64_read(&priv->rx_bytes);	/* total bytes received         */
fp@2589: 	storage->tx_bytes = atomic64_read(&priv->tx_bytes);	/* total bytes transmitted      */
fp@2589: 	storage->rx_errors = mac.frame_len_err + mac.rx_mem_full + mac.crc_err + mac.rx_err;	/* bad packets received         */
fp@2589: 	storage->tx_errors = mac.tx_mem_full;	/* packet transmit problems     */
fp@2589: 	storage->rx_dropped = atomic64_read(&priv->rx_dropped);	/* no space in linux buffers    */
fp@2589: 	storage->tx_dropped = atomic64_read(&priv->tx_dropped);	/* no space available in linux  */
fp@2589: 	//TODO __u64    multicast;              /* multicast packets received   */
fp@2589: 	//TODO __u64    collisions;
fp@2589: 
fp@2589: 	/* detailed rx_errors: */
fp@2589: 	storage->rx_length_errors = mac.frame_len_err;
fp@2589: 	storage->rx_over_errors = mac.rx_mem_full;	/* receiver ring buff overflow  */
fp@2589: 	storage->rx_crc_errors = mac.crc_err;	/* recved pkt with crc error    */
fp@2589: 	storage->rx_frame_errors = mac.rx_err;	/* recv'd frame alignment error */
fp@2589: 	storage->rx_fifo_errors = mac.rx_mem_full;	/* recv'r fifo overrun          */
fp@2589: 	//TODO __u64    rx_missed_errors;       /* receiver missed packet       */
fp@2589: 
fp@2589: 	/* detailed tx_errors */
fp@2589: 	//TODO __u64    tx_aborted_errors;
fp@2589: 	//TODO __u64    tx_carrier_errors;
fp@2589: 	//TODO __u64    tx_fifo_errors;
fp@2589: 	//TODO __u64    tx_heartbeat_errors;
fp@2589: 	//TODO __u64    tx_window_errors;
fp@2589: 
fp@2589: 	/* for cslip etc */
fp@2589: 	//TODO __u64    rx_compressed;
fp@2589: 	//TODO __u64    tx_compressed;
fp@2589: 	return storage;
fp@2589: }
fp@2589: 
fp@2589: static int ccat_eth_open(struct net_device *dev)
fp@2589: {
fp@2589: 	struct ccat_eth_priv *const priv = netdev_priv(dev);
fp@2589: 
fp@2589: 	hrtimer_init(&priv->poll_timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
fp@2589: 	priv->poll_timer.function = poll_timer_callback;
fp@2589: 	hrtimer_start(&priv->poll_timer, POLL_TIME, HRTIMER_MODE_REL);
fp@2589: 	return 0;
fp@2589: }
fp@2589: 
fp@2589: static int ccat_eth_stop(struct net_device *dev)
fp@2589: {
fp@2589: 	struct ccat_eth_priv *const priv = netdev_priv(dev);
fp@2589: 
fp@2589: 	priv->stop_queue(dev);
fp@2589: 	hrtimer_cancel(&priv->poll_timer);
fp@2589: 	return 0;
fp@2589: }
fp@2589: 
fp@2589: static const struct net_device_ops ccat_eth_netdev_ops = {
fp@2589: 	.ndo_get_stats64 = ccat_eth_get_stats64,
fp@2589: 	.ndo_open = ccat_eth_open,
fp@2589: 	.ndo_start_xmit = ccat_eth_start_xmit,
fp@2589: 	.ndo_stop = ccat_eth_stop,
fp@2589: };
fp@2589: 
fp@2589: struct ccat_eth_priv *ccat_eth_init(const struct ccat_device *const ccatdev,
fp@2589: 				    const void __iomem * const addr)
fp@2589: {
fp@2589: 	struct ccat_eth_priv *priv;
fp@2589: 	struct net_device *const netdev = alloc_etherdev(sizeof(*priv));
fp@2589: 
fp@2589: 	priv = netdev_priv(netdev);
fp@2589: 	priv->netdev = netdev;
fp@2589: 	priv->ccatdev = ccatdev;
fp@2589: 
fp@2589: 	/* ccat register mappings */
fp@2589: 	memcpy_fromio(&priv->info, addr, sizeof(priv->info));
fp@2589: 	ccat_eth_priv_init_mappings(priv);
fp@2589: 
fp@2589: 	if (ccat_eth_priv_init_dma(priv)) {
fp@2589: 		pr_warn("%s(): DMA initialization failed.\n", __FUNCTION__);
fp@2589: 		free_netdev(netdev);
fp@2589: 		return NULL;
fp@2589: 	}
fp@2589: 
fp@2589: 	/* init netdev with MAC and stack callbacks */
fp@2589: 	memcpy_fromio(netdev->dev_addr, priv->reg.mii + 8, netdev->addr_len);
fp@2589: 	netdev->netdev_ops = &ccat_eth_netdev_ops;
fp@2589: 
fp@2589: 	/* use as EtherCAT device? */
fp@2589: 	priv->ecdev = ecdev_offer(netdev, ec_poll_rx, THIS_MODULE);
fp@2589: 	if (priv->ecdev) {
fp@2589: 		priv->carrier_off = ecdev_carrier_off;
fp@2589: 		priv->carrier_ok = ecdev_carrier_ok;
fp@2589: 		priv->carrier_on = ecdev_carrier_on;
fp@2589: 		priv->kfree_skb_any = ecdev_kfree_skb_any;
fp@2589: 		priv->start_queue = ecdev_nop;
fp@2589: 		priv->stop_queue = ecdev_nop;
fp@2589: 		priv->unregister = unregister_ecdev;
fp@2589: 
fp@2589: 		priv->carrier_off(netdev);
fp@2589: 		if (ecdev_open(priv->ecdev)) {
fp@2589: 			pr_info("unable to register network device.\n");
fp@2589: 			ecdev_withdraw(priv->ecdev);
fp@2589: 			ccat_eth_priv_free_dma(priv);
fp@2589: 			free_netdev(netdev);
fp@2589: 			return NULL;
fp@2589: 		}
fp@2589: 		return priv;
fp@2589: 	}
fp@2589: 
fp@2589: 	/* EtherCAT disabled -> prepare normal ethernet mode */
fp@2589: 	priv->carrier_off = netif_carrier_off;
fp@2589: 	priv->carrier_ok = netif_carrier_ok;
fp@2589: 	priv->carrier_on = netif_carrier_on;
fp@2589: 	priv->kfree_skb_any = dev_kfree_skb_any;
fp@2589: 	priv->start_queue = netif_start_queue;
fp@2589: 	priv->stop_queue = netif_stop_queue;
fp@2589: 	priv->unregister = unregister_netdev;
fp@2589: 
fp@2589: 	priv->carrier_off(netdev);
fp@2589: 	if (register_netdev(netdev)) {
fp@2589: 		pr_info("unable to register network device.\n");
fp@2589: 		ccat_eth_priv_free_dma(priv);
fp@2589: 		free_netdev(netdev);
fp@2589: 		return NULL;
fp@2589: 	}
fp@2589: 	pr_info("registered %s as network device.\n", netdev->name);
fp@2589: 	return priv;
fp@2589: }
fp@2589: 
fp@2589: void ccat_eth_remove(struct ccat_eth_priv *const priv)
fp@2589: {
fp@2589: 	priv->unregister(priv->netdev);
fp@2589: 	ccat_eth_priv_free_dma(priv);
fp@2589: 	free_netdev(priv->netdev);
fp@2589: }