drivers/net/wan/pci200syn.c - arm/linux - Git at Google

 /*
  * Goramo PCI200SYN synchronous serial card driver for Linux
  *
  * Copyright (C) 2002-2008 Krzysztof Halasa <khc@pm.waw.pl>
  *
  * This program is free software; you can redistribute it and/or modify it
  * under the terms of version 2 of the GNU General Public License
  * as published by the Free Software Foundation.
  *
  * For information see <http://www.kernel.org/pub/linux/utils/net/hdlc/>
  *
  * Sources of information:
  *    Hitachi HD64572 SCA-II User's Manual
  *    PLX Technology Inc. PCI9052 Data Book
  */

 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

 #include <linux/module.h>
 #include <linux/kernel.h>
 #include <linux/capability.h>
 #include <linux/slab.h>
 #include <linux/types.h>
 #include <linux/fcntl.h>
 #include <linux/in.h>
 #include <linux/string.h>
 #include <linux/errno.h>
 #include <linux/init.h>
 #include <linux/ioport.h>
 #include <linux/moduleparam.h>
 #include <linux/netdevice.h>
 #include <linux/hdlc.h>
 #include <linux/pci.h>
 #include <linux/delay.h>
 #include <asm/io.h>

 #include "hd64572.h"

 #undef DEBUG_PKT
 #define DEBUG_RINGS

 #define PCI200SYN_PLX_SIZE	0x80	/* PLX control window size (128b) */
 #define PCI200SYN_SCA_SIZE	0x400	/* SCA window size (1Kb) */
 #define MAX_TX_BUFFERS		10

 static int pci_clock_freq = 33000000;
 #define CLOCK_BASE pci_clock_freq

 /*
  *      PLX PCI9052 local configuration and shared runtime registers.
  *      This structure can be used to access 9052 registers (memory mapped).
  */
 typedef struct {
 	u32 loc_addr_range[4];	/* 00-0Ch : Local Address Ranges */
 	u32 loc_rom_range;	/* 10h : Local ROM Range */
 	u32 loc_addr_base[4];	/* 14-20h : Local Address Base Addrs */
 	u32 loc_rom_base;	/* 24h : Local ROM Base */
 	u32 loc_bus_descr[4];	/* 28-34h : Local Bus Descriptors */
 	u32 rom_bus_descr;	/* 38h : ROM Bus Descriptor */
 	u32 cs_base[4];		/* 3C-48h : Chip Select Base Addrs */
 	u32 intr_ctrl_stat;	/* 4Ch : Interrupt Control/Status */
 	u32 init_ctrl;		/* 50h : EEPROM ctrl, Init Ctrl, etc */
 }plx9052;


 typedef struct port_s {
 	struct napi_struct napi;
 	struct net_device *netdev;
 	struct card_s *card;
 	spinlock_t lock;	/* TX lock */
 	sync_serial_settings settings;
 	int rxpart;		/* partial frame received, next frame invalid*/
 	unsigned short encoding;
 	unsigned short parity;
 	u16 rxin;		/* rx ring buffer 'in' pointer */
 	u16 txin;		/* tx ring buffer 'in' and 'last' pointers */
 	u16 txlast;
 	u8 rxs, txs, tmc;	/* SCA registers */
 	u8 chan;		/* physical port # - 0 or 1 */
 }port_t;


 typedef struct card_s {
 	u8 __iomem *rambase;	/* buffer memory base (virtual) */
 	u8 __iomem *scabase;	/* SCA memory base (virtual) */
 	plx9052 __iomem *plxbase;/* PLX registers memory base (virtual) */
 	u16 rx_ring_buffers;	/* number of buffers in a ring */
 	u16 tx_ring_buffers;
 	u16 buff_offset;	/* offset of first buffer of first channel */
 	u8 irq;			/* interrupt request level */

 	port_t ports[2];
 }card_t;


 #define get_port(card, port)	     (&card->ports[port])
 #define sca_flush(card)		     (sca_in(IER0, card));

 static inline void new_memcpy_toio(char __iomem *dest, char *src, int length)
 {
 	int len;
 	do {
 		len = length > 256 ? 256 : length;
 		memcpy_toio(dest, src, len);
 		dest += len;
 		src += len;
 		length -= len;
 		readb(dest);
 	} while (len);
 }

 #undef memcpy_toio
 #define memcpy_toio new_memcpy_toio

 #include "hd64572.c"


 static void pci200_set_iface(port_t *port)
 {
 	card_t *card = port->card;
 	u16 msci = get_msci(port);
 	u8 rxs = port->rxs & CLK_BRG_MASK;
 	u8 txs = port->txs & CLK_BRG_MASK;

 	sca_out(EXS_TES1, (port->chan ? MSCI1_OFFSET : MSCI0_OFFSET) + EXS,
 		port->card);
 	switch(port->settings.clock_type) {
 	case CLOCK_INT:
 		rxs |= CLK_BRG; /* BRG output */
 		txs |= CLK_PIN_OUT | CLK_TX_RXCLK; /* RX clock */
 		break;

 	case CLOCK_TXINT:
 		rxs |= CLK_LINE; /* RXC input */
 		txs |= CLK_PIN_OUT | CLK_BRG; /* BRG output */
 		break;

 	case CLOCK_TXFROMRX:
 		rxs |= CLK_LINE; /* RXC input */
 		txs |= CLK_PIN_OUT | CLK_TX_RXCLK; /* RX clock */
 		break;

 	default:		/* EXTernal clock */
 		rxs |= CLK_LINE; /* RXC input */
 		txs |= CLK_PIN_OUT | CLK_LINE; /* TXC input */
 		break;
 	}

 	port->rxs = rxs;
 	port->txs = txs;
 	sca_out(rxs, msci + RXS, card);
 	sca_out(txs, msci + TXS, card);
 	sca_set_port(port);
 }


 static int pci200_open(struct net_device *dev)
 {
 	port_t *port = dev_to_port(dev);

 	int result = hdlc_open(dev);
 	if (result)
 		return result;

 	sca_open(dev);
 	pci200_set_iface(port);
 	sca_flush(port->card);
 	return 0;
 }


 static int pci200_close(struct net_device *dev)
 {
 	sca_close(dev);
 	sca_flush(dev_to_port(dev)->card);
 	hdlc_close(dev);
 	return 0;
 }


 static int pci200_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
 {
 	const size_t size = sizeof(sync_serial_settings);
 	sync_serial_settings new_line;
 	sync_serial_settings __user *line = ifr->ifr_settings.ifs_ifsu.sync;
 	port_t *port = dev_to_port(dev);

 #ifdef DEBUG_RINGS
 	if (cmd == SIOCDEVPRIVATE) {
 		sca_dump_rings(dev);
 		return 0;
 	}
 #endif
 	if (cmd != SIOCWANDEV)
 		return hdlc_ioctl(dev, ifr, cmd);

 	switch(ifr->ifr_settings.type) {
 	case IF_GET_IFACE:
 		ifr->ifr_settings.type = IF_IFACE_V35;
 		if (ifr->ifr_settings.size < size) {
 			ifr->ifr_settings.size = size; /* data size wanted */
 			return -ENOBUFS;
 		}
 		if (copy_to_user(line, &port->settings, size))
 			return -EFAULT;
 		return 0;

 	case IF_IFACE_V35:
 	case IF_IFACE_SYNC_SERIAL:
 		if (!capable(CAP_NET_ADMIN))
 			return -EPERM;

 		if (copy_from_user(&new_line, line, size))
 			return -EFAULT;

 		if (new_line.clock_type != CLOCK_EXT &&
 		    new_line.clock_type != CLOCK_TXFROMRX &&
 		    new_line.clock_type != CLOCK_INT &&
 		    new_line.clock_type != CLOCK_TXINT)
 			return -EINVAL;	/* No such clock setting */

 		if (new_line.loopback != 0 && new_line.loopback != 1)
 			return -EINVAL;

 		memcpy(&port->settings, &new_line, size); /* Update settings */
 		pci200_set_iface(port);
 		sca_flush(port->card);
 		return 0;

 	default:
 		return hdlc_ioctl(dev, ifr, cmd);
 	}
 }


 static void pci200_pci_remove_one(struct pci_dev *pdev)
 {
 	int i;
 	card_t *card = pci_get_drvdata(pdev);

 	for (i = 0; i < 2; i++)
 		if (card->ports[i].card)
 			unregister_hdlc_device(card->ports[i].netdev);

 	if (card->irq)
 		free_irq(card->irq, card);

 	if (card->rambase)
 		iounmap(card->rambase);
 	if (card->scabase)
 		iounmap(card->scabase);
 	if (card->plxbase)
 		iounmap(card->plxbase);

 	pci_release_regions(pdev);
 	pci_disable_device(pdev);
 	if (card->ports[0].netdev)
 		free_netdev(card->ports[0].netdev);
 	if (card->ports[1].netdev)
 		free_netdev(card->ports[1].netdev);
 	kfree(card);
 }

 static const struct net_device_ops pci200_ops = {
 	.ndo_open       = pci200_open,
 	.ndo_stop       = pci200_close,
 	.ndo_start_xmit = hdlc_start_xmit,
 	.ndo_do_ioctl   = pci200_ioctl,
 };

 static int pci200_pci_init_one(struct pci_dev *pdev,
 			       const struct pci_device_id *ent)
 {
 	card_t *card;
 	u32 __iomem *p;
 	int i;
 	u32 ramsize;
 	u32 ramphys;		/* buffer memory base */
 	u32 scaphys;		/* SCA memory base */
 	u32 plxphys;		/* PLX registers memory base */

 	i = pci_enable_device(pdev);
 	if (i)
 		return i;

 	i = pci_request_regions(pdev, "PCI200SYN");
 	if (i) {
 		pci_disable_device(pdev);
 		return i;
 	}

 	card = kzalloc(sizeof(card_t), GFP_KERNEL);
 	if (card == NULL) {
 		pci_release_regions(pdev);
 		pci_disable_device(pdev);
 		return -ENOBUFS;
 	}
 	pci_set_drvdata(pdev, card);
 	card->ports[0].netdev = alloc_hdlcdev(&card->ports[0]);
 	card->ports[1].netdev = alloc_hdlcdev(&card->ports[1]);
 	if (!card->ports[0].netdev || !card->ports[1].netdev) {
 		pr_err("unable to allocate memory\n");
 		pci200_pci_remove_one(pdev);
 		return -ENOMEM;
 	}

 	if (pci_resource_len(pdev, 0) != PCI200SYN_PLX_SIZE ||
 	    pci_resource_len(pdev, 2) != PCI200SYN_SCA_SIZE ||
 	    pci_resource_len(pdev, 3) < 16384) {
 		pr_err("invalid card EEPROM parameters\n");
 		pci200_pci_remove_one(pdev);
 		return -EFAULT;
 	}

 	plxphys = pci_resource_start(pdev,0) & PCI_BASE_ADDRESS_MEM_MASK;
 	card->plxbase = ioremap(plxphys, PCI200SYN_PLX_SIZE);

 	scaphys = pci_resource_start(pdev,2) & PCI_BASE_ADDRESS_MEM_MASK;
 	card->scabase = ioremap(scaphys, PCI200SYN_SCA_SIZE);

 	ramphys = pci_resource_start(pdev,3) & PCI_BASE_ADDRESS_MEM_MASK;
 	card->rambase = pci_ioremap_bar(pdev, 3);

 	if (card->plxbase == NULL ||
 	    card->scabase == NULL ||
 	    card->rambase == NULL) {
 		pr_err("ioremap() failed\n");
 		pci200_pci_remove_one(pdev);
 		return -EFAULT;
 	}

 	/* Reset PLX */
 	p = &card->plxbase->init_ctrl;
 	writel(readl(p) | 0x40000000, p);
 	readl(p);		/* Flush the write - do not use sca_flush */
 	udelay(1);

 	writel(readl(p) & ~0x40000000, p);
 	readl(p);		/* Flush the write - do not use sca_flush */
 	udelay(1);

 	ramsize = sca_detect_ram(card, card->rambase,
 				 pci_resource_len(pdev, 3));

 	/* number of TX + RX buffers for one port - this is dual port card */
 	i = ramsize / (2 * (sizeof(pkt_desc) + HDLC_MAX_MRU));
 	card->tx_ring_buffers = min(i / 2, MAX_TX_BUFFERS);
 	card->rx_ring_buffers = i - card->tx_ring_buffers;

 	card->buff_offset = 2 * sizeof(pkt_desc) * (card->tx_ring_buffers +
 						    card->rx_ring_buffers);

 	pr_info("%u KB RAM at 0x%x, IRQ%u, using %u TX + %u RX packets rings\n",
 		ramsize / 1024, ramphys,
 		pdev->irq, card->tx_ring_buffers, card->rx_ring_buffers);

 	if (card->tx_ring_buffers < 1) {
 		pr_err("RAM test failed\n");
 		pci200_pci_remove_one(pdev);
 		return -EFAULT;
 	}

 	/* Enable interrupts on the PCI bridge */
 	p = &card->plxbase->intr_ctrl_stat;
 	writew(readw(p) | 0x0040, p);

 	/* Allocate IRQ */
 	if (request_irq(pdev->irq, sca_intr, IRQF_SHARED, "pci200syn", card)) {
 		pr_warn("could not allocate IRQ%d\n", pdev->irq);
 		pci200_pci_remove_one(pdev);
 		return -EBUSY;
 	}
 	card->irq = pdev->irq;

 	sca_init(card, 0);

 	for (i = 0; i < 2; i++) {
 		port_t *port = &card->ports[i];
 		struct net_device *dev = port->netdev;
 		hdlc_device *hdlc = dev_to_hdlc(dev);
 		port->chan = i;

 		spin_lock_init(&port->lock);
 		dev->irq = card->irq;
 		dev->mem_start = ramphys;
 		dev->mem_end = ramphys + ramsize - 1;
 		dev->tx_queue_len = 50;
 		dev->netdev_ops = &pci200_ops;
 		hdlc->attach = sca_attach;
 		hdlc->xmit = sca_xmit;
 		port->settings.clock_type = CLOCK_EXT;
 		port->card = card;
 		sca_init_port(port);
 		if (register_hdlc_device(dev)) {
 			pr_err("unable to register hdlc device\n");
 			port->card = NULL;
 			pci200_pci_remove_one(pdev);
 			return -ENOBUFS;
 		}

 		netdev_info(dev, "PCI200SYN channel %d\n", port->chan);
 	}

 	sca_flush(card);
 	return 0;
 }


 static const struct pci_device_id pci200_pci_tbl[] = {
 	{ PCI_VENDOR_ID_PLX, PCI_DEVICE_ID_PLX_9050, PCI_VENDOR_ID_PLX,
 	  PCI_DEVICE_ID_PLX_PCI200SYN, 0, 0, 0 },
 	{ 0, }
 };


 static struct pci_driver pci200_pci_driver = {
 	.name		= "PCI200SYN",
 	.id_table	= pci200_pci_tbl,
 	.probe		= pci200_pci_init_one,
 	.remove		= pci200_pci_remove_one,
 };


 static int __init pci200_init_module(void)
 {
 	if (pci_clock_freq < 1000000 || pci_clock_freq > 80000000) {
 		pr_err("Invalid PCI clock frequency\n");
 		return -EINVAL;
 	}
 	return pci_register_driver(&pci200_pci_driver);
 }


 static void __exit pci200_cleanup_module(void)
 {
 	pci_unregister_driver(&pci200_pci_driver);
 }

 MODULE_AUTHOR("Krzysztof Halasa <khc@pm.waw.pl>");
 MODULE_DESCRIPTION("Goramo PCI200SYN serial port driver");
 MODULE_LICENSE("GPL v2");
 MODULE_DEVICE_TABLE(pci, pci200_pci_tbl);
 module_param(pci_clock_freq, int, 0444);
 MODULE_PARM_DESC(pci_clock_freq, "System PCI clock frequency in Hz");
 module_init(pci200_init_module);
 module_exit(pci200_cleanup_module);
	/*
	* Goramo PCI200SYN synchronous serial card driver for Linux
	*
	* Copyright (C) 2002-2008 Krzysztof Halasa <khc@pm.waw.pl>
	*
	* This program is free software; you can redistribute it and/or modify it
	* under the terms of version 2 of the GNU General Public License
	* as published by the Free Software Foundation.
	*
	* For information see <http://www.kernel.org/pub/linux/utils/net/hdlc/>
	*
	* Sources of information:
	* Hitachi HD64572 SCA-II User's Manual
	* PLX Technology Inc. PCI9052 Data Book
	*/

	#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

	#include <linux/module.h>
	#include <linux/kernel.h>
	#include <linux/capability.h>
	#include <linux/slab.h>
	#include <linux/types.h>
	#include <linux/fcntl.h>
	#include <linux/in.h>
	#include <linux/string.h>
	#include <linux/errno.h>
	#include <linux/init.h>
	#include <linux/ioport.h>
	#include <linux/moduleparam.h>
	#include <linux/netdevice.h>
	#include <linux/hdlc.h>
	#include <linux/pci.h>
	#include <linux/delay.h>
	#include <asm/io.h>

	#include "hd64572.h"

	#undef DEBUG_PKT
	#define DEBUG_RINGS

	#define PCI200SYN_PLX_SIZE 0x80 /* PLX control window size (128b) */
	#define PCI200SYN_SCA_SIZE 0x400 /* SCA window size (1Kb) */
	#define MAX_TX_BUFFERS 10

	static int pci_clock_freq = 33000000;
	#define CLOCK_BASE pci_clock_freq

	/*
	* PLX PCI9052 local configuration and shared runtime registers.
	* This structure can be used to access 9052 registers (memory mapped).
	*/
	typedef struct {
	u32 loc_addr_range[4]; /* 00-0Ch : Local Address Ranges */
	u32 loc_rom_range; /* 10h : Local ROM Range */
	u32 loc_addr_base[4]; /* 14-20h : Local Address Base Addrs */
	u32 loc_rom_base; /* 24h : Local ROM Base */
	u32 loc_bus_descr[4]; /* 28-34h : Local Bus Descriptors */
	u32 rom_bus_descr; /* 38h : ROM Bus Descriptor */
	u32 cs_base[4]; /* 3C-48h : Chip Select Base Addrs */
	u32 intr_ctrl_stat; /* 4Ch : Interrupt Control/Status */
	u32 init_ctrl; /* 50h : EEPROM ctrl, Init Ctrl, etc */
	}plx9052;



	typedef struct port_s {
	struct napi_struct napi;
	struct net_device *netdev;
	struct card_s *card;
	spinlock_t lock; /* TX lock */
	sync_serial_settings settings;
	int rxpart; /* partial frame received, next frame invalid*/
	unsigned short encoding;
	unsigned short parity;
	u16 rxin; /* rx ring buffer 'in' pointer */
	u16 txin; /* tx ring buffer 'in' and 'last' pointers */
	u16 txlast;
	u8 rxs, txs, tmc; /* SCA registers */
	u8 chan; /* physical port # - 0 or 1 */
	}port_t;



	typedef struct card_s {
	u8 __iomem rambase; / buffer memory base (virtual) */
	u8 __iomem scabase; / SCA memory base (virtual) */
	plx9052 __iomem plxbase;/ PLX registers memory base (virtual) */
	u16 rx_ring_buffers; /* number of buffers in a ring */
	u16 tx_ring_buffers;
	u16 buff_offset; /* offset of first buffer of first channel */
	u8 irq; /* interrupt request level */

	port_t ports[2];
	}card_t;


	#define get_port(card, port) (&card->ports[port])
	#define sca_flush(card) (sca_in(IER0, card));

	static inline void new_memcpy_toio(char __iomem dest, char src, int length)
	{
	int len;
	do {
	len = length > 256 ? 256 : length;
	memcpy_toio(dest, src, len);
	dest += len;
	src += len;
	length -= len;
	readb(dest);
	} while (len);
	}

	#undef memcpy_toio
	#define memcpy_toio new_memcpy_toio

	#include "hd64572.c"


	static void pci200_set_iface(port_t *port)
	{
	card_t *card = port->card;
	u16 msci = get_msci(port);
	u8 rxs = port->rxs & CLK_BRG_MASK;
	u8 txs = port->txs & CLK_BRG_MASK;

	sca_out(EXS_TES1, (port->chan ? MSCI1_OFFSET : MSCI0_OFFSET) + EXS,
	port->card);
	switch(port->settings.clock_type) {
	case CLOCK_INT:
	rxs \|= CLK_BRG; /* BRG output */
	txs \|= CLK_PIN_OUT \| CLK_TX_RXCLK; /* RX clock */
	break;

	case CLOCK_TXINT:
	rxs \|= CLK_LINE; /* RXC input */
	txs \|= CLK_PIN_OUT \| CLK_BRG; /* BRG output */
	break;

	case CLOCK_TXFROMRX:
	rxs \|= CLK_LINE; /* RXC input */
	txs \|= CLK_PIN_OUT \| CLK_TX_RXCLK; /* RX clock */
	break;

	default: /* EXTernal clock */
	rxs \|= CLK_LINE; /* RXC input */
	txs \|= CLK_PIN_OUT \| CLK_LINE; /* TXC input */
	break;
	}

	port->rxs = rxs;
	port->txs = txs;
	sca_out(rxs, msci + RXS, card);
	sca_out(txs, msci + TXS, card);
	sca_set_port(port);
	}



	static int pci200_open(struct net_device *dev)
	{
	port_t *port = dev_to_port(dev);

	int result = hdlc_open(dev);
	if (result)
	return result;

	sca_open(dev);
	pci200_set_iface(port);
	sca_flush(port->card);
	return 0;
	}



	static int pci200_close(struct net_device *dev)
	{
	sca_close(dev);
	sca_flush(dev_to_port(dev)->card);
	hdlc_close(dev);
	return 0;
	}



	static int pci200_ioctl(struct net_device dev, struct ifreq ifr, int cmd)
	{
	const size_t size = sizeof(sync_serial_settings);
	sync_serial_settings new_line;
	sync_serial_settings __user *line = ifr->ifr_settings.ifs_ifsu.sync;
	port_t *port = dev_to_port(dev);

	#ifdef DEBUG_RINGS
	if (cmd == SIOCDEVPRIVATE) {
	sca_dump_rings(dev);
	return 0;
	}
	#endif
	if (cmd != SIOCWANDEV)
	return hdlc_ioctl(dev, ifr, cmd);

	switch(ifr->ifr_settings.type) {
	case IF_GET_IFACE:
	ifr->ifr_settings.type = IF_IFACE_V35;
	if (ifr->ifr_settings.size < size) {
	ifr->ifr_settings.size = size; /* data size wanted */
	return -ENOBUFS;
	}
	if (copy_to_user(line, &port->settings, size))
	return -EFAULT;
	return 0;

	case IF_IFACE_V35:
	case IF_IFACE_SYNC_SERIAL:
	if (!capable(CAP_NET_ADMIN))
	return -EPERM;

	if (copy_from_user(&new_line, line, size))
	return -EFAULT;

	if (new_line.clock_type != CLOCK_EXT &&
	new_line.clock_type != CLOCK_TXFROMRX &&
	new_line.clock_type != CLOCK_INT &&
	new_line.clock_type != CLOCK_TXINT)
	return -EINVAL; /* No such clock setting */

	if (new_line.loopback != 0 && new_line.loopback != 1)
	return -EINVAL;

	memcpy(&port->settings, &new_line, size); /* Update settings */
	pci200_set_iface(port);
	sca_flush(port->card);
	return 0;

	default:
	return hdlc_ioctl(dev, ifr, cmd);
	}
	}



	static void pci200_pci_remove_one(struct pci_dev *pdev)
	{
	int i;
	card_t *card = pci_get_drvdata(pdev);

	for (i = 0; i < 2; i++)
	if (card->ports[i].card)
	unregister_hdlc_device(card->ports[i].netdev);

	if (card->irq)
	free_irq(card->irq, card);

	if (card->rambase)
	iounmap(card->rambase);
	if (card->scabase)
	iounmap(card->scabase);
	if (card->plxbase)
	iounmap(card->plxbase);

	pci_release_regions(pdev);
	pci_disable_device(pdev);
	if (card->ports[0].netdev)
	free_netdev(card->ports[0].netdev);
	if (card->ports[1].netdev)
	free_netdev(card->ports[1].netdev);
	kfree(card);
	}

	static const struct net_device_ops pci200_ops = {
	.ndo_open = pci200_open,
	.ndo_stop = pci200_close,
	.ndo_start_xmit = hdlc_start_xmit,
	.ndo_do_ioctl = pci200_ioctl,
	};

	static int pci200_pci_init_one(struct pci_dev *pdev,
	const struct pci_device_id *ent)
	{
	card_t *card;
	u32 __iomem *p;
	int i;
	u32 ramsize;
	u32 ramphys; /* buffer memory base */
	u32 scaphys; /* SCA memory base */
	u32 plxphys; /* PLX registers memory base */

	i = pci_enable_device(pdev);
	if (i)
	return i;

	i = pci_request_regions(pdev, "PCI200SYN");
	if (i) {
	pci_disable_device(pdev);
	return i;
	}

	card = kzalloc(sizeof(card_t), GFP_KERNEL);
	if (card == NULL) {
	pci_release_regions(pdev);
	pci_disable_device(pdev);
	return -ENOBUFS;
	}
	pci_set_drvdata(pdev, card);
	card->ports[0].netdev = alloc_hdlcdev(&card->ports[0]);
	card->ports[1].netdev = alloc_hdlcdev(&card->ports[1]);
	if (!card->ports[0].netdev \|\| !card->ports[1].netdev) {
	pr_err("unable to allocate memory\n");
	pci200_pci_remove_one(pdev);
	return -ENOMEM;
	}

	if (pci_resource_len(pdev, 0) != PCI200SYN_PLX_SIZE \|\|
	pci_resource_len(pdev, 2) != PCI200SYN_SCA_SIZE \|\|
	pci_resource_len(pdev, 3) < 16384) {
	pr_err("invalid card EEPROM parameters\n");
	pci200_pci_remove_one(pdev);
	return -EFAULT;
	}

	plxphys = pci_resource_start(pdev,0) & PCI_BASE_ADDRESS_MEM_MASK;
	card->plxbase = ioremap(plxphys, PCI200SYN_PLX_SIZE);

	scaphys = pci_resource_start(pdev,2) & PCI_BASE_ADDRESS_MEM_MASK;
	card->scabase = ioremap(scaphys, PCI200SYN_SCA_SIZE);

	ramphys = pci_resource_start(pdev,3) & PCI_BASE_ADDRESS_MEM_MASK;
	card->rambase = pci_ioremap_bar(pdev, 3);

	if (card->plxbase == NULL \|\|
	card->scabase == NULL \|\|
	card->rambase == NULL) {
	pr_err("ioremap() failed\n");
	pci200_pci_remove_one(pdev);
	return -EFAULT;
	}

	/* Reset PLX */
	p = &card->plxbase->init_ctrl;
	writel(readl(p) \| 0x40000000, p);
	readl(p); /* Flush the write - do not use sca_flush */
	udelay(1);

	writel(readl(p) & ~0x40000000, p);
	readl(p); /* Flush the write - do not use sca_flush */
	udelay(1);

	ramsize = sca_detect_ram(card, card->rambase,
	pci_resource_len(pdev, 3));

	/* number of TX + RX buffers for one port - this is dual port card */
	i = ramsize / (2 * (sizeof(pkt_desc) + HDLC_MAX_MRU));
	card->tx_ring_buffers = min(i / 2, MAX_TX_BUFFERS);
	card->rx_ring_buffers = i - card->tx_ring_buffers;

	card->buff_offset = 2 * sizeof(pkt_desc) * (card->tx_ring_buffers +
	card->rx_ring_buffers);

	pr_info("%u KB RAM at 0x%x, IRQ%u, using %u TX + %u RX packets rings\n",
	ramsize / 1024, ramphys,
	pdev->irq, card->tx_ring_buffers, card->rx_ring_buffers);

	if (card->tx_ring_buffers < 1) {
	pr_err("RAM test failed\n");
	pci200_pci_remove_one(pdev);
	return -EFAULT;
	}

	/* Enable interrupts on the PCI bridge */
	p = &card->plxbase->intr_ctrl_stat;
	writew(readw(p) \| 0x0040, p);

	/* Allocate IRQ */
	if (request_irq(pdev->irq, sca_intr, IRQF_SHARED, "pci200syn", card)) {
	pr_warn("could not allocate IRQ%d\n", pdev->irq);
	pci200_pci_remove_one(pdev);
	return -EBUSY;
	}
	card->irq = pdev->irq;

	sca_init(card, 0);

	for (i = 0; i < 2; i++) {
	port_t *port = &card->ports[i];
	struct net_device *dev = port->netdev;
	hdlc_device *hdlc = dev_to_hdlc(dev);
	port->chan = i;

	spin_lock_init(&port->lock);
	dev->irq = card->irq;
	dev->mem_start = ramphys;
	dev->mem_end = ramphys + ramsize - 1;
	dev->tx_queue_len = 50;
	dev->netdev_ops = &pci200_ops;
	hdlc->attach = sca_attach;
	hdlc->xmit = sca_xmit;
	port->settings.clock_type = CLOCK_EXT;
	port->card = card;
	sca_init_port(port);
	if (register_hdlc_device(dev)) {
	pr_err("unable to register hdlc device\n");
	port->card = NULL;
	pci200_pci_remove_one(pdev);
	return -ENOBUFS;
	}

	netdev_info(dev, "PCI200SYN channel %d\n", port->chan);
	}

	sca_flush(card);
	return 0;
	}



	static const struct pci_device_id pci200_pci_tbl[] = {
	{ PCI_VENDOR_ID_PLX, PCI_DEVICE_ID_PLX_9050, PCI_VENDOR_ID_PLX,
	PCI_DEVICE_ID_PLX_PCI200SYN, 0, 0, 0 },
	{ 0, }
	};


	static struct pci_driver pci200_pci_driver = {
	.name = "PCI200SYN",
	.id_table = pci200_pci_tbl,
	.probe = pci200_pci_init_one,
	.remove = pci200_pci_remove_one,
	};


	static int __init pci200_init_module(void)
	{
	if (pci_clock_freq < 1000000 \|\| pci_clock_freq > 80000000) {
	pr_err("Invalid PCI clock frequency\n");
	return -EINVAL;
	}
	return pci_register_driver(&pci200_pci_driver);
	}



	static void __exit pci200_cleanup_module(void)
	{
	pci_unregister_driver(&pci200_pci_driver);
	}

	MODULE_AUTHOR("Krzysztof Halasa <khc@pm.waw.pl>");
	MODULE_DESCRIPTION("Goramo PCI200SYN serial port driver");
	MODULE_LICENSE("GPL v2");
	MODULE_DEVICE_TABLE(pci, pci200_pci_tbl);
	module_param(pci_clock_freq, int, 0444);
	MODULE_PARM_DESC(pci_clock_freq, "System PCI clock frequency in Hz");
	module_init(pci200_init_module);
	module_exit(pci200_cleanup_module);