drivers/net/wan/hostess_sv11.c - linux - Git at Google

 // SPDX-License-Identifier: GPL-2.0-only
 /*
  *	Comtrol SV11 card driver
  *
  *	This is a slightly odd Z85230 synchronous driver. All you need to
  *	know basically is
  *
  *	Its a genuine Z85230
  *
  *	It supports DMA using two DMA channels in SYNC mode. The driver doesn't
  *	use these facilities
  *
  *	The control port is at io+1, the data at io+3 and turning off the DMA
  *	is done by writing 0 to io+4
  *
  *	The hardware does the bus handling to avoid the need for delays between
  *	touching control registers.
  *
  *	Port B isn't wired (why - beats me)
  *
  *	Generic HDLC port Copyright (C) 2008 Krzysztof Halasa <khc@pm.waw.pl>
  */

 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

 #include <linux/module.h>
 #include <linux/kernel.h>
 #include <linux/mm.h>
 #include <linux/net.h>
 #include <linux/skbuff.h>
 #include <linux/netdevice.h>
 #include <linux/if_arp.h>
 #include <linux/delay.h>
 #include <linux/hdlc.h>
 #include <linux/ioport.h>
 #include <linux/slab.h>
 #include <net/arp.h>

 #include <asm/irq.h>
 #include <asm/io.h>
 #include <asm/dma.h>
 #include <asm/byteorder.h>
 #include "z85230.h"

 static int dma;

 /*
  *	Network driver support routines
  */

 static inline struct z8530_dev* dev_to_sv(struct net_device *dev)
 {
 	return (struct z8530_dev *)dev_to_hdlc(dev)->priv;
 }

 /*
  *	Frame receive. Simple for our card as we do HDLC and there
  *	is no funny garbage involved
  */

 static void hostess_input(struct z8530_channel *c, struct sk_buff *skb)
 {
 	/* Drop the CRC - it's not a good idea to try and negotiate it ;) */
 	skb_trim(skb, skb->len - 2);
 	skb->protocol = hdlc_type_trans(skb, c->netdevice);
 	skb_reset_mac_header(skb);
 	skb->dev = c->netdevice;
 	/*
 	 *	Send it to the PPP layer. We don't have time to process
 	 *	it right now.
 	 */
 	netif_rx(skb);
 }

 /*
  *	We've been placed in the UP state
  */

 static int hostess_open(struct net_device *d)
 {
 	struct z8530_dev *sv11 = dev_to_sv(d);
 	int err = -1;

 	/*
 	 *	Link layer up
 	 */
 	switch (dma) {
 		case 0:
 			err = z8530_sync_open(d, &sv11->chanA);
 			break;
 		case 1:
 			err = z8530_sync_dma_open(d, &sv11->chanA);
 			break;
 		case 2:
 			err = z8530_sync_txdma_open(d, &sv11->chanA);
 			break;
 	}

 	if (err)
 		return err;

 	err = hdlc_open(d);
 	if (err) {
 		switch (dma) {
 			case 0:
 				z8530_sync_close(d, &sv11->chanA);
 				break;
 			case 1:
 				z8530_sync_dma_close(d, &sv11->chanA);
 				break;
 			case 2:
 				z8530_sync_txdma_close(d, &sv11->chanA);
 				break;
 		}
 		return err;
 	}
 	sv11->chanA.rx_function = hostess_input;

 	/*
 	 *	Go go go
 	 */

 	netif_start_queue(d);
 	return 0;
 }

 static int hostess_close(struct net_device *d)
 {
 	struct z8530_dev *sv11 = dev_to_sv(d);
 	/*
 	 *	Discard new frames
 	 */
 	sv11->chanA.rx_function = z8530_null_rx;

 	hdlc_close(d);
 	netif_stop_queue(d);

 	switch (dma) {
 		case 0:
 			z8530_sync_close(d, &sv11->chanA);
 			break;
 		case 1:
 			z8530_sync_dma_close(d, &sv11->chanA);
 			break;
 		case 2:
 			z8530_sync_txdma_close(d, &sv11->chanA);
 			break;
 	}
 	return 0;
 }

 static int hostess_ioctl(struct net_device *d, struct ifreq *ifr, int cmd)
 {
 	/* struct z8530_dev *sv11=dev_to_sv(d);
 	   z8530_ioctl(d,&sv11->chanA,ifr,cmd) */
 	return hdlc_ioctl(d, ifr, cmd);
 }

 /*
  *	Passed network frames, fire them downwind.
  */

 static netdev_tx_t hostess_queue_xmit(struct sk_buff *skb,
 					    struct net_device *d)
 {
 	return z8530_queue_xmit(&dev_to_sv(d)->chanA, skb);
 }

 static int hostess_attach(struct net_device *dev, unsigned short encoding,
 			  unsigned short parity)
 {
 	if (encoding == ENCODING_NRZ && parity == PARITY_CRC16_PR1_CCITT)
 		return 0;
 	return -EINVAL;
 }

 /*
  *	Description block for a Comtrol Hostess SV11 card
  */

 static const struct net_device_ops hostess_ops = {
 	.ndo_open       = hostess_open,
 	.ndo_stop       = hostess_close,
 	.ndo_start_xmit = hdlc_start_xmit,
 	.ndo_do_ioctl   = hostess_ioctl,
 };

 static struct z8530_dev *sv11_init(int iobase, int irq)
 {
 	struct z8530_dev *sv;
 	struct net_device *netdev;
 	/*
 	 *	Get the needed I/O space
 	 */

 	if (!request_region(iobase, 8, "Comtrol SV11")) {
 		pr_warn("I/O 0x%X already in use\n", iobase);
 		return NULL;
 	}

 	sv = kzalloc(sizeof(struct z8530_dev), GFP_KERNEL);
 	if (!sv)
 		goto err_kzalloc;

 	/*
 	 *	Stuff in the I/O addressing
 	 */

 	sv->active = 0;

 	sv->chanA.ctrlio = iobase + 1;
 	sv->chanA.dataio = iobase + 3;
 	sv->chanB.ctrlio = -1;
 	sv->chanB.dataio = -1;
 	sv->chanA.irqs = &z8530_nop;
 	sv->chanB.irqs = &z8530_nop;

 	outb(0, iobase + 4);		/* DMA off */

 	/* We want a fast IRQ for this device. Actually we'd like an even faster
 	   IRQ ;) - This is one driver RtLinux is made for */

 	if (request_irq(irq, z8530_interrupt, 0,
 			"Hostess SV11", sv) < 0) {
 		pr_warn("IRQ %d already in use\n", irq);
 		goto err_irq;
 	}

 	sv->irq = irq;
 	sv->chanA.private = sv;
 	sv->chanA.dev = sv;
 	sv->chanB.dev = sv;

 	if (dma) {
 		/*
 		 *	You can have DMA off or 1 and 3 thats the lot
 		 *	on the Comtrol.
 		 */
 		sv->chanA.txdma = 3;
 		sv->chanA.rxdma = 1;
 		outb(0x03 | 0x08, iobase + 4);		/* DMA on */
 		if (request_dma(sv->chanA.txdma, "Hostess SV/11 (TX)"))
 			goto err_txdma;

 		if (dma == 1)
 			if (request_dma(sv->chanA.rxdma, "Hostess SV/11 (RX)"))
 				goto err_rxdma;
 	}

 	/* Kill our private IRQ line the hostess can end up chattering
 	   until the configuration is set */
 	disable_irq(irq);

 	/*
 	 *	Begin normal initialise
 	 */

 	if (z8530_init(sv)) {
 		pr_err("Z8530 series device not found\n");
 		enable_irq(irq);
 		goto free_dma;
 	}
 	z8530_channel_load(&sv->chanB, z8530_dead_port);
 	if (sv->type == Z85C30)
 		z8530_channel_load(&sv->chanA, z8530_hdlc_kilostream);
 	else
 		z8530_channel_load(&sv->chanA, z8530_hdlc_kilostream_85230);

 	enable_irq(irq);

 	/*
 	 *	Now we can take the IRQ
 	 */

 	sv->chanA.netdevice = netdev = alloc_hdlcdev(sv);
 	if (!netdev)
 		goto free_dma;

 	dev_to_hdlc(netdev)->attach = hostess_attach;
 	dev_to_hdlc(netdev)->xmit = hostess_queue_xmit;
 	netdev->netdev_ops = &hostess_ops;
 	netdev->base_addr = iobase;
 	netdev->irq = irq;

 	if (register_hdlc_device(netdev)) {
 		pr_err("unable to register HDLC device\n");
 		free_netdev(netdev);
 		goto free_dma;
 	}

 	z8530_describe(sv, "I/O", iobase);
 	sv->active = 1;
 	return sv;

 free_dma:
 	if (dma == 1)
 		free_dma(sv->chanA.rxdma);
 err_rxdma:
 	if (dma)
 		free_dma(sv->chanA.txdma);
 err_txdma:
 	free_irq(irq, sv);
 err_irq:
 	kfree(sv);
 err_kzalloc:
 	release_region(iobase, 8);
 	return NULL;
 }

 static void sv11_shutdown(struct z8530_dev *dev)
 {
 	unregister_hdlc_device(dev->chanA.netdevice);
 	z8530_shutdown(dev);
 	free_irq(dev->irq, dev);
 	if (dma) {
 		if (dma == 1)
 			free_dma(dev->chanA.rxdma);
 		free_dma(dev->chanA.txdma);
 	}
 	release_region(dev->chanA.ctrlio - 1, 8);
 	free_netdev(dev->chanA.netdevice);
 	kfree(dev);
 }

 static int io = 0x200;
 static int irq = 9;

 module_param_hw(io, int, ioport, 0);
 MODULE_PARM_DESC(io, "The I/O base of the Comtrol Hostess SV11 card");
 module_param_hw(dma, int, dma, 0);
 MODULE_PARM_DESC(dma, "Set this to 1 to use DMA1/DMA3 for TX/RX");
 module_param_hw(irq, int, irq, 0);
 MODULE_PARM_DESC(irq, "The interrupt line setting for the Comtrol Hostess SV11 card");

 MODULE_AUTHOR("Alan Cox");
 MODULE_LICENSE("GPL");
 MODULE_DESCRIPTION("Modular driver for the Comtrol Hostess SV11");

 static struct z8530_dev *sv11_unit;

 int init_module(void)
 {
 	if ((sv11_unit = sv11_init(io, irq)) == NULL)
 		return -ENODEV;
 	return 0;
 }

 void cleanup_module(void)
 {
 	if (sv11_unit)
 		sv11_shutdown(sv11_unit);
 }
	// SPDX-License-Identifier: GPL-2.0-only
	/*
	* Comtrol SV11 card driver
	*
	* This is a slightly odd Z85230 synchronous driver. All you need to
	* know basically is
	*
	* Its a genuine Z85230
	*
	* It supports DMA using two DMA channels in SYNC mode. The driver doesn't
	* use these facilities
	*
	* The control port is at io+1, the data at io+3 and turning off the DMA
	* is done by writing 0 to io+4
	*
	* The hardware does the bus handling to avoid the need for delays between
	* touching control registers.
	*
	* Port B isn't wired (why - beats me)
	*
	* Generic HDLC port Copyright (C) 2008 Krzysztof Halasa <khc@pm.waw.pl>
	*/

	#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

	#include <linux/module.h>
	#include <linux/kernel.h>
	#include <linux/mm.h>
	#include <linux/net.h>
	#include <linux/skbuff.h>
	#include <linux/netdevice.h>
	#include <linux/if_arp.h>
	#include <linux/delay.h>
	#include <linux/hdlc.h>
	#include <linux/ioport.h>
	#include <linux/slab.h>
	#include <net/arp.h>

	#include <asm/irq.h>
	#include <asm/io.h>
	#include <asm/dma.h>
	#include <asm/byteorder.h>
	#include "z85230.h"

	static int dma;

	/*
	* Network driver support routines
	*/

	static inline struct z8530_dev* dev_to_sv(struct net_device *dev)
	{
	return (struct z8530_dev *)dev_to_hdlc(dev)->priv;
	}

	/*
	* Frame receive. Simple for our card as we do HDLC and there
	* is no funny garbage involved
	*/

	static void hostess_input(struct z8530_channel c, struct sk_buff skb)
	{
	/* Drop the CRC - it's not a good idea to try and negotiate it ;) */
	skb_trim(skb, skb->len - 2);
	skb->protocol = hdlc_type_trans(skb, c->netdevice);
	skb_reset_mac_header(skb);
	skb->dev = c->netdevice;
	/*
	* Send it to the PPP layer. We don't have time to process
	* it right now.
	*/
	netif_rx(skb);
	}

	/*
	* We've been placed in the UP state
	*/

	static int hostess_open(struct net_device *d)
	{
	struct z8530_dev *sv11 = dev_to_sv(d);
	int err = -1;

	/*
	* Link layer up
	*/
	switch (dma) {
	case 0:
	err = z8530_sync_open(d, &sv11->chanA);
	break;
	case 1:
	err = z8530_sync_dma_open(d, &sv11->chanA);
	break;
	case 2:
	err = z8530_sync_txdma_open(d, &sv11->chanA);
	break;
	}

	if (err)
	return err;

	err = hdlc_open(d);
	if (err) {
	switch (dma) {
	case 0:
	z8530_sync_close(d, &sv11->chanA);
	break;
	case 1:
	z8530_sync_dma_close(d, &sv11->chanA);
	break;
	case 2:
	z8530_sync_txdma_close(d, &sv11->chanA);
	break;
	}
	return err;
	}
	sv11->chanA.rx_function = hostess_input;

	/*
	* Go go go
	*/

	netif_start_queue(d);
	return 0;
	}

	static int hostess_close(struct net_device *d)
	{
	struct z8530_dev *sv11 = dev_to_sv(d);
	/*
	* Discard new frames
	*/
	sv11->chanA.rx_function = z8530_null_rx;

	hdlc_close(d);
	netif_stop_queue(d);

	switch (dma) {
	case 0:
	z8530_sync_close(d, &sv11->chanA);
	break;
	case 1:
	z8530_sync_dma_close(d, &sv11->chanA);
	break;
	case 2:
	z8530_sync_txdma_close(d, &sv11->chanA);
	break;
	}
	return 0;
	}

	static int hostess_ioctl(struct net_device d, struct ifreq ifr, int cmd)
	{
	/* struct z8530_dev *sv11=dev_to_sv(d);
	z8530_ioctl(d,&sv11->chanA,ifr,cmd) */
	return hdlc_ioctl(d, ifr, cmd);
	}

	/*
	* Passed network frames, fire them downwind.
	*/

	static netdev_tx_t hostess_queue_xmit(struct sk_buff *skb,
	struct net_device *d)
	{
	return z8530_queue_xmit(&dev_to_sv(d)->chanA, skb);
	}

	static int hostess_attach(struct net_device *dev, unsigned short encoding,
	unsigned short parity)
	{
	if (encoding == ENCODING_NRZ && parity == PARITY_CRC16_PR1_CCITT)
	return 0;
	return -EINVAL;
	}

	/*
	* Description block for a Comtrol Hostess SV11 card
	*/

	static const struct net_device_ops hostess_ops = {
	.ndo_open = hostess_open,
	.ndo_stop = hostess_close,
	.ndo_start_xmit = hdlc_start_xmit,
	.ndo_do_ioctl = hostess_ioctl,
	};

	static struct z8530_dev *sv11_init(int iobase, int irq)
	{
	struct z8530_dev *sv;
	struct net_device *netdev;
	/*
	* Get the needed I/O space
	*/

	if (!request_region(iobase, 8, "Comtrol SV11")) {
	pr_warn("I/O 0x%X already in use\n", iobase);
	return NULL;
	}

	sv = kzalloc(sizeof(struct z8530_dev), GFP_KERNEL);
	if (!sv)
	goto err_kzalloc;

	/*
	* Stuff in the I/O addressing
	*/

	sv->active = 0;

	sv->chanA.ctrlio = iobase + 1;
	sv->chanA.dataio = iobase + 3;
	sv->chanB.ctrlio = -1;
	sv->chanB.dataio = -1;
	sv->chanA.irqs = &z8530_nop;
	sv->chanB.irqs = &z8530_nop;

	outb(0, iobase + 4); /* DMA off */

	/* We want a fast IRQ for this device. Actually we'd like an even faster
	IRQ ;) - This is one driver RtLinux is made for */

	if (request_irq(irq, z8530_interrupt, 0,
	"Hostess SV11", sv) < 0) {
	pr_warn("IRQ %d already in use\n", irq);
	goto err_irq;
	}

	sv->irq = irq;
	sv->chanA.private = sv;
	sv->chanA.dev = sv;
	sv->chanB.dev = sv;

	if (dma) {
	/*
	* You can have DMA off or 1 and 3 thats the lot
	* on the Comtrol.
	*/
	sv->chanA.txdma = 3;
	sv->chanA.rxdma = 1;
	outb(0x03 \| 0x08, iobase + 4); /* DMA on */
	if (request_dma(sv->chanA.txdma, "Hostess SV/11 (TX)"))
	goto err_txdma;

	if (dma == 1)
	if (request_dma(sv->chanA.rxdma, "Hostess SV/11 (RX)"))
	goto err_rxdma;
	}

	/* Kill our private IRQ line the hostess can end up chattering
	until the configuration is set */
	disable_irq(irq);

	/*
	* Begin normal initialise
	*/

	if (z8530_init(sv)) {
	pr_err("Z8530 series device not found\n");
	enable_irq(irq);
	goto free_dma;
	}
	z8530_channel_load(&sv->chanB, z8530_dead_port);
	if (sv->type == Z85C30)
	z8530_channel_load(&sv->chanA, z8530_hdlc_kilostream);
	else
	z8530_channel_load(&sv->chanA, z8530_hdlc_kilostream_85230);

	enable_irq(irq);

	/*
	* Now we can take the IRQ
	*/

	sv->chanA.netdevice = netdev = alloc_hdlcdev(sv);
	if (!netdev)
	goto free_dma;

	dev_to_hdlc(netdev)->attach = hostess_attach;
	dev_to_hdlc(netdev)->xmit = hostess_queue_xmit;
	netdev->netdev_ops = &hostess_ops;
	netdev->base_addr = iobase;
	netdev->irq = irq;

	if (register_hdlc_device(netdev)) {
	pr_err("unable to register HDLC device\n");
	free_netdev(netdev);
	goto free_dma;
	}

	z8530_describe(sv, "I/O", iobase);
	sv->active = 1;
	return sv;

	free_dma:
	if (dma == 1)
	free_dma(sv->chanA.rxdma);
	err_rxdma:
	if (dma)
	free_dma(sv->chanA.txdma);
	err_txdma:
	free_irq(irq, sv);
	err_irq:
	kfree(sv);
	err_kzalloc:
	release_region(iobase, 8);
	return NULL;
	}

	static void sv11_shutdown(struct z8530_dev *dev)
	{
	unregister_hdlc_device(dev->chanA.netdevice);
	z8530_shutdown(dev);
	free_irq(dev->irq, dev);
	if (dma) {
	if (dma == 1)
	free_dma(dev->chanA.rxdma);
	free_dma(dev->chanA.txdma);
	}
	release_region(dev->chanA.ctrlio - 1, 8);
	free_netdev(dev->chanA.netdevice);
	kfree(dev);
	}

	static int io = 0x200;
	static int irq = 9;

	module_param_hw(io, int, ioport, 0);
	MODULE_PARM_DESC(io, "The I/O base of the Comtrol Hostess SV11 card");
	module_param_hw(dma, int, dma, 0);
	MODULE_PARM_DESC(dma, "Set this to 1 to use DMA1/DMA3 for TX/RX");
	module_param_hw(irq, int, irq, 0);
	MODULE_PARM_DESC(irq, "The interrupt line setting for the Comtrol Hostess SV11 card");

	MODULE_AUTHOR("Alan Cox");
	MODULE_LICENSE("GPL");
	MODULE_DESCRIPTION("Modular driver for the Comtrol Hostess SV11");

	static struct z8530_dev *sv11_unit;

	int init_module(void)
	{
	if ((sv11_unit = sv11_init(io, irq)) == NULL)
	return -ENODEV;
	return 0;
	}

	void cleanup_module(void)
	{
	if (sv11_unit)
	sv11_shutdown(sv11_unit);
	}