drivers/net/hp-plus.c - kernel/msm-4.19 - Gitiles

 /* hp-plus.c: A HP PCLAN/plus ethernet driver for linux. */
 /*
 	Written 1994 by Donald Becker.

 	This driver is for the Hewlett Packard PC LAN (27***) plus ethercards.
 	These cards are sold under several model numbers, usually 2724*.

 	This software may be used and distributed according to the terms
 	of the GNU General Public License, incorporated herein by reference.

 	The author may be reached as becker@scyld.com, or C/O
 	Scyld Computing Corporation
 	410 Severn Ave., Suite 210
 	Annapolis MD 21403

 	As is often the case, a great deal of credit is owed to Russ Nelson.
 	The Crynwr packet driver was my primary source of HP-specific
 	programming information.
 */

 static const char version[] =
 "hp-plus.c:v1.10 9/24/94 Donald Becker (becker@cesdis.gsfc.nasa.gov)\n";

 #include <linux/module.h>

 #include <linux/string.h>		/* Important -- this inlines word moves. */
 #include <linux/kernel.h>
 #include <linux/errno.h>
 #include <linux/ioport.h>
 #include <linux/netdevice.h>
 #include <linux/etherdevice.h>
 #include <linux/init.h>
 #include <linux/delay.h>

 #include <asm/system.h>
 #include <asm/io.h>

 #include "8390.h"

 #define DRV_NAME "hp-plus"

 /* A zero-terminated list of I/O addresses to be probed. */
 static unsigned int hpplus_portlist[] __initdata =
 {0x200, 0x240, 0x280, 0x2C0, 0x300, 0x320, 0x340, 0};

 /*
    The HP EtherTwist chip implementation is a fairly routine DP8390
    implementation.  It allows both shared memory and programmed-I/O buffer
    access, using a custom interface for both.  The programmed-I/O mode is
    entirely implemented in the HP EtherTwist chip, bypassing the problem
    ridden built-in 8390 facilities used on NE2000 designs.  The shared
    memory mode is likewise special, with an offset register used to make
    packets appear at the shared memory base.  Both modes use a base and bounds
    page register to hide the Rx ring buffer wrap -- a packet that spans the
    end of physical buffer memory appears continuous to the driver. (c.f. the
    3c503 and Cabletron E2100)

    A special note: the internal buffer of the board is only 8 bits wide.
    This lays several nasty traps for the unaware:
    - the 8390 must be programmed for byte-wide operations
    - all I/O and memory operations must work on whole words (the access
      latches are serially preloaded and have no byte-swapping ability).

    This board is laid out in I/O space much like the earlier HP boards:
    the first 16 locations are for the board registers, and the second 16 are
    for the 8390.  The board is easy to identify, with both a dedicated 16 bit
    ID register and a constant 0x530* value in the upper bits of the paging
    register.
 */

 #define HP_ID			0x00	/* ID register, always 0x4850. */
 #define HP_PAGING		0x02	/* Registers visible @ 8-f, see PageName. */
 #define HPP_OPTION		0x04	/* Bitmapped options, see HP_Option.	*/
 #define HPP_OUT_ADDR	0x08	/* I/O output location in Perf_Page.	*/
 #define HPP_IN_ADDR		0x0A	/* I/O input location in Perf_Page.		*/
 #define HP_DATAPORT		0x0c	/* I/O data transfer in Perf_Page.		*/
 #define NIC_OFFSET		0x10	/* Offset to the 8390 registers.		*/
 #define HP_IO_EXTENT	32

 #define HP_START_PG		0x00	/* First page of TX buffer */
 #define HP_STOP_PG		0x80	/* Last page +1 of RX ring */

 /* The register set selected in HP_PAGING. */
 enum PageName {
 	Perf_Page = 0,				/* Normal operation. */
 	MAC_Page = 1,				/* The ethernet address (+checksum). */
 	HW_Page = 2,				/* EEPROM-loaded hardware parameters. */
 	LAN_Page = 4,				/* Transceiver selection, testing, etc. */
 	ID_Page = 6 };

 /* The bit definitions for the HPP_OPTION register. */
 enum HP_Option {
 	NICReset = 1, ChipReset = 2, 	/* Active low, really UNreset. */
 	EnableIRQ = 4, FakeIntr = 8, BootROMEnb = 0x10, IOEnb = 0x20,
 	MemEnable = 0x40, ZeroWait = 0x80, MemDisable = 0x1000, };

 static int hpp_probe1(struct net_device *dev, int ioaddr);

 static void hpp_reset_8390(struct net_device *dev);
 static int hpp_open(struct net_device *dev);
 static int hpp_close(struct net_device *dev);
 static void hpp_mem_block_input(struct net_device *dev, int count,
 						  struct sk_buff *skb, int ring_offset);
 static void hpp_mem_block_output(struct net_device *dev, int count,
 							const unsigned char *buf, int start_page);
 static void hpp_mem_get_8390_hdr(struct net_device *dev, struct e8390_pkt_hdr *hdr,
 						  int ring_page);
 static void hpp_io_block_input(struct net_device *dev, int count,
 						  struct sk_buff *skb, int ring_offset);
 static void hpp_io_block_output(struct net_device *dev, int count,
 							const unsigned char *buf, int start_page);
 static void hpp_io_get_8390_hdr(struct net_device *dev, struct e8390_pkt_hdr *hdr,
 						  int ring_page);


 /*	Probe a list of addresses for an HP LAN+ adaptor.
 	This routine is almost boilerplate. */

 static int __init do_hpp_probe(struct net_device *dev)
 {
 	int i;
 	int base_addr = dev->base_addr;
 	int irq = dev->irq;

 	if (base_addr > 0x1ff)		/* Check a single specified location. */
 		return hpp_probe1(dev, base_addr);
 	else if (base_addr != 0)	/* Don't probe at all. */
 		return -ENXIO;

 	for (i = 0; hpplus_portlist[i]; i++) {
 		if (hpp_probe1(dev, hpplus_portlist[i]) == 0)
 			return 0;
 		dev->irq = irq;
 	}

 	return -ENODEV;
 }

 #ifndef MODULE
 struct net_device * __init hp_plus_probe(int unit)
 {
 	struct net_device *dev = alloc_eip_netdev();
 	int err;

 	if (!dev)
 		return ERR_PTR(-ENOMEM);

 	sprintf(dev->name, "eth%d", unit);
 	netdev_boot_setup_check(dev);

 	err = do_hpp_probe(dev);
 	if (err)
 		goto out;
 	return dev;
 out:
 	free_netdev(dev);
 	return ERR_PTR(err);
 }
 #endif

 /* Do the interesting part of the probe at a single address. */
 static int __init hpp_probe1(struct net_device *dev, int ioaddr)
 {
 	int i, retval;
 	unsigned char checksum = 0;
 	const char name[] = "HP-PC-LAN+";
 	int mem_start;
 	static unsigned version_printed;

 	if (!request_region(ioaddr, HP_IO_EXTENT, DRV_NAME))
 		return -EBUSY;

 	/* Check for the HP+ signature, 50 48 0x 53. */
 	if (inw(ioaddr + HP_ID) != 0x4850
 		|| (inw(ioaddr + HP_PAGING) & 0xfff0) != 0x5300) {
 		retval = -ENODEV;
 		goto out;
 	}

 	if (ei_debug  &&  version_printed++ == 0)
 		printk(version);

 	printk("%s: %s at %#3x, ", dev->name, name, ioaddr);

 	/* Retrieve and checksum the station address. */
 	outw(MAC_Page, ioaddr + HP_PAGING);

 	for(i = 0; i < ETHER_ADDR_LEN; i++) {
 		unsigned char inval = inb(ioaddr + 8 + i);
 		dev->dev_addr[i] = inval;
 		checksum += inval;
 	}
 	checksum += inb(ioaddr + 14);

 	printk("%pM", dev->dev_addr);

 	if (checksum != 0xff) {
 		printk(" bad checksum %2.2x.\n", checksum);
 		retval = -ENODEV;
 		goto out;
 	} else {
 		/* Point at the Software Configuration Flags. */
 		outw(ID_Page, ioaddr + HP_PAGING);
 		printk(" ID %4.4x", inw(ioaddr + 12));
 	}

 	/* Read the IRQ line. */
 	outw(HW_Page, ioaddr + HP_PAGING);
 	{
 		int irq = inb(ioaddr + 13) & 0x0f;
 		int option = inw(ioaddr + HPP_OPTION);

 		dev->irq = irq;
 		if (option & MemEnable) {
 			mem_start = inw(ioaddr + 9) << 8;
 			printk(", IRQ %d, memory address %#x.\n", irq, mem_start);
 		} else {
 			mem_start = 0;
 			printk(", IRQ %d, programmed-I/O mode.\n", irq);
 		}
 	}

 	/* Set the wrap registers for string I/O reads.   */
 	outw((HP_START_PG + TX_PAGES/2) | ((HP_STOP_PG - 1) << 8), ioaddr + 14);

 	/* Set the base address to point to the NIC, not the "real" base! */
 	dev->base_addr = ioaddr + NIC_OFFSET;

 	dev->open = &hpp_open;
 	dev->stop = &hpp_close;
 #ifdef CONFIG_NET_POLL_CONTROLLER
 	dev->poll_controller = ei_poll;
 #endif

 	ei_status.name = name;
 	ei_status.word16 = 0;		/* Agggghhhhh! Debug time: 2 days! */
 	ei_status.tx_start_page = HP_START_PG;
 	ei_status.rx_start_page = HP_START_PG + TX_PAGES/2;
 	ei_status.stop_page = HP_STOP_PG;

 	ei_status.reset_8390 = &hpp_reset_8390;
 	ei_status.block_input = &hpp_io_block_input;
 	ei_status.block_output = &hpp_io_block_output;
 	ei_status.get_8390_hdr = &hpp_io_get_8390_hdr;

 	/* Check if the memory_enable flag is set in the option register. */
 	if (mem_start) {
 		ei_status.block_input = &hpp_mem_block_input;
 		ei_status.block_output = &hpp_mem_block_output;
 		ei_status.get_8390_hdr = &hpp_mem_get_8390_hdr;
 		dev->mem_start = mem_start;
 		ei_status.mem = ioremap(mem_start,
 					(HP_STOP_PG - HP_START_PG)*256);
 		if (!ei_status.mem) {
 			retval = -ENOMEM;
 			goto out;
 		}
 		ei_status.rmem_start = dev->mem_start + TX_PAGES/2*256;
 		dev->mem_end = ei_status.rmem_end
 			= dev->mem_start + (HP_STOP_PG - HP_START_PG)*256;
 	}

 	outw(Perf_Page, ioaddr + HP_PAGING);
 	NS8390p_init(dev, 0);
 	/* Leave the 8390 and HP chip reset. */
 	outw(inw(ioaddr + HPP_OPTION) & ~EnableIRQ, ioaddr + HPP_OPTION);

 	retval = register_netdev(dev);
 	if (retval)
 		goto out1;
 	return 0;
 out1:
 	iounmap(ei_status.mem);
 out:
 	release_region(ioaddr, HP_IO_EXTENT);
 	return retval;
 }

 static int
 hpp_open(struct net_device *dev)
 {
 	int ioaddr = dev->base_addr - NIC_OFFSET;
 	int option_reg;
 	int retval;

 	if ((retval = request_irq(dev->irq, eip_interrupt, 0, dev->name, dev))) {
 	    return retval;
 	}

 	/* Reset the 8390 and HP chip. */
 	option_reg = inw(ioaddr + HPP_OPTION);
 	outw(option_reg & ~(NICReset + ChipReset), ioaddr + HPP_OPTION);
 	udelay(5);
 	/* Unreset the board and enable interrupts. */
 	outw(option_reg | (EnableIRQ + NICReset + ChipReset), ioaddr + HPP_OPTION);

 	/* Set the wrap registers for programmed-I/O operation.   */
 	outw(HW_Page, ioaddr + HP_PAGING);
 	outw((HP_START_PG + TX_PAGES/2) | ((HP_STOP_PG - 1) << 8), ioaddr + 14);

 	/* Select the operational page. */
 	outw(Perf_Page, ioaddr + HP_PAGING);

 	eip_open(dev);
 	return 0;
 }

 static int
 hpp_close(struct net_device *dev)
 {
 	int ioaddr = dev->base_addr - NIC_OFFSET;
 	int option_reg = inw(ioaddr + HPP_OPTION);

 	free_irq(dev->irq, dev);
 	eip_close(dev);
 	outw((option_reg & ~EnableIRQ) | MemDisable | NICReset | ChipReset,
 		 ioaddr + HPP_OPTION);

 	return 0;
 }

 static void
 hpp_reset_8390(struct net_device *dev)
 {
 	int ioaddr = dev->base_addr - NIC_OFFSET;
 	int option_reg = inw(ioaddr + HPP_OPTION);

 	if (ei_debug > 1) printk("resetting the 8390 time=%ld...", jiffies);

 	outw(option_reg & ~(NICReset + ChipReset), ioaddr + HPP_OPTION);
 	/* Pause a few cycles for the hardware reset to take place. */
 	udelay(5);
 	ei_status.txing = 0;
 	outw(option_reg | (EnableIRQ + NICReset + ChipReset), ioaddr + HPP_OPTION);

 	udelay(5);


 	if ((inb_p(ioaddr+NIC_OFFSET+EN0_ISR) & ENISR_RESET) == 0)
 		printk("%s: hp_reset_8390() did not complete.\n", dev->name);

 	if (ei_debug > 1) printk("8390 reset done (%ld).", jiffies);
 	return;
 }

 /* The programmed-I/O version of reading the 4 byte 8390 specific header.
    Note that transfer with the EtherTwist+ must be on word boundaries. */

 static void
 hpp_io_get_8390_hdr(struct net_device *dev, struct e8390_pkt_hdr *hdr, int ring_page)
 {
 	int ioaddr = dev->base_addr - NIC_OFFSET;

 	outw((ring_page<<8), ioaddr + HPP_IN_ADDR);
 	insw(ioaddr + HP_DATAPORT, hdr, sizeof(struct e8390_pkt_hdr)>>1);
 }

 /* Block input and output, similar to the Crynwr packet driver. */

 static void
 hpp_io_block_input(struct net_device *dev, int count, struct sk_buff *skb, int ring_offset)
 {
 	int ioaddr = dev->base_addr - NIC_OFFSET;
 	char *buf = skb->data;

 	outw(ring_offset, ioaddr + HPP_IN_ADDR);
 	insw(ioaddr + HP_DATAPORT, buf, count>>1);
 	if (count & 0x01)
         buf[count-1] = inw(ioaddr + HP_DATAPORT);
 }

 /* The corresponding shared memory versions of the above 2 functions. */

 static void
 hpp_mem_get_8390_hdr(struct net_device *dev, struct e8390_pkt_hdr *hdr, int ring_page)
 {
 	int ioaddr = dev->base_addr - NIC_OFFSET;
 	int option_reg = inw(ioaddr + HPP_OPTION);

 	outw((ring_page<<8), ioaddr + HPP_IN_ADDR);
 	outw(option_reg & ~(MemDisable + BootROMEnb), ioaddr + HPP_OPTION);
 	memcpy_fromio(hdr, ei_status.mem, sizeof(struct e8390_pkt_hdr));
 	outw(option_reg, ioaddr + HPP_OPTION);
 	hdr->count = (le16_to_cpu(hdr->count) + 3) & ~3;	/* Round up allocation. */
 }

 static void
 hpp_mem_block_input(struct net_device *dev, int count, struct sk_buff *skb, int ring_offset)
 {
 	int ioaddr = dev->base_addr - NIC_OFFSET;
 	int option_reg = inw(ioaddr + HPP_OPTION);

 	outw(ring_offset, ioaddr + HPP_IN_ADDR);

 	outw(option_reg & ~(MemDisable + BootROMEnb), ioaddr + HPP_OPTION);

 	/* Caution: this relies on get_8390_hdr() rounding up count!
 	   Also note that we *can't* use eth_io_copy_and_sum() because
 	   it will not always copy "count" bytes (e.g. padded IP).  */

 	memcpy_fromio(skb->data, ei_status.mem, count);
 	outw(option_reg, ioaddr + HPP_OPTION);
 }

 /* A special note: we *must* always transfer >=16 bit words.
    It's always safe to round up, so we do. */
 static void
 hpp_io_block_output(struct net_device *dev, int count,
 					const unsigned char *buf, int start_page)
 {
 	int ioaddr = dev->base_addr - NIC_OFFSET;
 	outw(start_page << 8, ioaddr + HPP_OUT_ADDR);
 	outsl(ioaddr + HP_DATAPORT, buf, (count+3)>>2);
 	return;
 }

 static void
 hpp_mem_block_output(struct net_device *dev, int count,
 				const unsigned char *buf, int start_page)
 {
 	int ioaddr = dev->base_addr - NIC_OFFSET;
 	int option_reg = inw(ioaddr + HPP_OPTION);

 	outw(start_page << 8, ioaddr + HPP_OUT_ADDR);
 	outw(option_reg & ~(MemDisable + BootROMEnb), ioaddr + HPP_OPTION);
 	memcpy_toio(ei_status.mem, buf, (count + 3) & ~3);
 	outw(option_reg, ioaddr + HPP_OPTION);

 	return;
 }


 #ifdef MODULE
 #define MAX_HPP_CARDS	4	/* Max number of HPP cards per module */
 static struct net_device *dev_hpp[MAX_HPP_CARDS];
 static int io[MAX_HPP_CARDS];
 static int irq[MAX_HPP_CARDS];

 module_param_array(io, int, NULL, 0);
 module_param_array(irq, int, NULL, 0);
 MODULE_PARM_DESC(io, "I/O port address(es)");
 MODULE_PARM_DESC(irq, "IRQ number(s); ignored if properly detected");
 MODULE_DESCRIPTION("HP PC-LAN+ ISA ethernet driver");
 MODULE_LICENSE("GPL");

 /* This is set up so that only a single autoprobe takes place per call.
 ISA device autoprobes on a running machine are not recommended. */
 int __init
 init_module(void)
 {
 	struct net_device *dev;
 	int this_dev, found = 0;

 	for (this_dev = 0; this_dev < MAX_HPP_CARDS; this_dev++) {
 		if (io[this_dev] == 0)  {
 			if (this_dev != 0) break; /* only autoprobe 1st one */
 			printk(KERN_NOTICE "hp-plus.c: Presently autoprobing (not recommended) for a single card.\n");
 		}
 		dev = alloc_ei_netdev();
 		if (!dev)
 			break;
 		dev->irq = irq[this_dev];
 		dev->base_addr = io[this_dev];
 		if (do_hpp_probe(dev) == 0) {
 			dev_hpp[found++] = dev;
 			continue;
 		}
 		free_netdev(dev);
 		printk(KERN_WARNING "hp-plus.c: No HP-Plus card found (i/o = 0x%x).\n", io[this_dev]);
 		break;
 	}
 	if (found)
 		return 0;
 	return -ENXIO;
 }

 static void cleanup_card(struct net_device *dev)
 {
 	/* NB: hpp_close() handles free_irq */
 	iounmap(ei_status.mem);
 	release_region(dev->base_addr - NIC_OFFSET, HP_IO_EXTENT);
 }

 void __exit
 cleanup_module(void)
 {
 	int this_dev;

 	for (this_dev = 0; this_dev < MAX_HPP_CARDS; this_dev++) {
 		struct net_device *dev = dev_hpp[this_dev];
 		if (dev) {
 			unregister_netdev(dev);
 			cleanup_card(dev);
 			free_netdev(dev);
 		}
 	}
 }
 #endif /* MODULE */
	/* hp-plus.c: A HP PCLAN/plus ethernet driver for linux. */
	/*
	Written 1994 by Donald Becker.

	This driver is for the Hewlett Packard PC LAN (27***) plus ethercards.
	These cards are sold under several model numbers, usually 2724*.

	This software may be used and distributed according to the terms
	of the GNU General Public License, incorporated herein by reference.

	The author may be reached as becker@scyld.com, or C/O
	Scyld Computing Corporation
	410 Severn Ave., Suite 210
	Annapolis MD 21403

	As is often the case, a great deal of credit is owed to Russ Nelson.
	The Crynwr packet driver was my primary source of HP-specific
	programming information.
	*/

	static const char version[] =
	"hp-plus.c:v1.10 9/24/94 Donald Becker (becker@cesdis.gsfc.nasa.gov)\n";

	#include <linux/module.h>

	#include <linux/string.h> /* Important -- this inlines word moves. */
	#include <linux/kernel.h>
	#include <linux/errno.h>
	#include <linux/ioport.h>
	#include <linux/netdevice.h>
	#include <linux/etherdevice.h>
	#include <linux/init.h>
	#include <linux/delay.h>

	#include <asm/system.h>
	#include <asm/io.h>

	#include "8390.h"

	#define DRV_NAME "hp-plus"

	/* A zero-terminated list of I/O addresses to be probed. */
	static unsigned int hpplus_portlist[] __initdata =
	{0x200, 0x240, 0x280, 0x2C0, 0x300, 0x320, 0x340, 0};

	/*
	The HP EtherTwist chip implementation is a fairly routine DP8390
	implementation. It allows both shared memory and programmed-I/O buffer
	access, using a custom interface for both. The programmed-I/O mode is
	entirely implemented in the HP EtherTwist chip, bypassing the problem
	ridden built-in 8390 facilities used on NE2000 designs. The shared
	memory mode is likewise special, with an offset register used to make
	packets appear at the shared memory base. Both modes use a base and bounds
	page register to hide the Rx ring buffer wrap -- a packet that spans the
	end of physical buffer memory appears continuous to the driver. (c.f. the
	3c503 and Cabletron E2100)

	A special note: the internal buffer of the board is only 8 bits wide.
	This lays several nasty traps for the unaware:
	- the 8390 must be programmed for byte-wide operations
	- all I/O and memory operations must work on whole words (the access
	latches are serially preloaded and have no byte-swapping ability).

	This board is laid out in I/O space much like the earlier HP boards:
	the first 16 locations are for the board registers, and the second 16 are
	for the 8390. The board is easy to identify, with both a dedicated 16 bit
	ID register and a constant 0x530* value in the upper bits of the paging
	register.
	*/

	#define HP_ID 0x00 /* ID register, always 0x4850. */
	#define HP_PAGING 0x02 /* Registers visible @ 8-f, see PageName. */
	#define HPP_OPTION 0x04 /* Bitmapped options, see HP_Option. */
	#define HPP_OUT_ADDR 0x08 /* I/O output location in Perf_Page. */
	#define HPP_IN_ADDR 0x0A /* I/O input location in Perf_Page. */
	#define HP_DATAPORT 0x0c /* I/O data transfer in Perf_Page. */
	#define NIC_OFFSET 0x10 /* Offset to the 8390 registers. */
	#define HP_IO_EXTENT 32

	#define HP_START_PG 0x00 /* First page of TX buffer */
	#define HP_STOP_PG 0x80 /* Last page +1 of RX ring */

	/* The register set selected in HP_PAGING. */
	enum PageName {
	Perf_Page = 0, /* Normal operation. */
	MAC_Page = 1, /* The ethernet address (+checksum). */
	HW_Page = 2, /* EEPROM-loaded hardware parameters. */
	LAN_Page = 4, /* Transceiver selection, testing, etc. */
	ID_Page = 6 };

	/* The bit definitions for the HPP_OPTION register. */
	enum HP_Option {
	NICReset = 1, ChipReset = 2, /* Active low, really UNreset. */
	EnableIRQ = 4, FakeIntr = 8, BootROMEnb = 0x10, IOEnb = 0x20,
	MemEnable = 0x40, ZeroWait = 0x80, MemDisable = 0x1000, };

	static int hpp_probe1(struct net_device *dev, int ioaddr);

	static void hpp_reset_8390(struct net_device *dev);
	static int hpp_open(struct net_device *dev);
	static int hpp_close(struct net_device *dev);
	static void hpp_mem_block_input(struct net_device *dev, int count,
	struct sk_buff *skb, int ring_offset);
	static void hpp_mem_block_output(struct net_device *dev, int count,
	const unsigned char *buf, int start_page);
	static void hpp_mem_get_8390_hdr(struct net_device dev, struct e8390_pkt_hdr hdr,
	int ring_page);
	static void hpp_io_block_input(struct net_device *dev, int count,
	struct sk_buff *skb, int ring_offset);
	static void hpp_io_block_output(struct net_device *dev, int count,
	const unsigned char *buf, int start_page);
	static void hpp_io_get_8390_hdr(struct net_device dev, struct e8390_pkt_hdr hdr,
	int ring_page);


	/* Probe a list of addresses for an HP LAN+ adaptor.
	This routine is almost boilerplate. */

	static int __init do_hpp_probe(struct net_device *dev)
	{
	int i;
	int base_addr = dev->base_addr;
	int irq = dev->irq;

	if (base_addr > 0x1ff) /* Check a single specified location. */
	return hpp_probe1(dev, base_addr);
	else if (base_addr != 0) /* Don't probe at all. */
	return -ENXIO;

	for (i = 0; hpplus_portlist[i]; i++) {
	if (hpp_probe1(dev, hpplus_portlist[i]) == 0)
	return 0;
	dev->irq = irq;
	}

	return -ENODEV;
	}

	#ifndef MODULE
	struct net_device * __init hp_plus_probe(int unit)
	{
	struct net_device *dev = alloc_eip_netdev();
	int err;

	if (!dev)
	return ERR_PTR(-ENOMEM);

	sprintf(dev->name, "eth%d", unit);
	netdev_boot_setup_check(dev);

	err = do_hpp_probe(dev);
	if (err)
	goto out;
	return dev;
	out:
	free_netdev(dev);
	return ERR_PTR(err);
	}
	#endif

	/* Do the interesting part of the probe at a single address. */
	static int __init hpp_probe1(struct net_device *dev, int ioaddr)
	{
	int i, retval;
	unsigned char checksum = 0;
	const char name[] = "HP-PC-LAN+";
	int mem_start;
	static unsigned version_printed;

	if (!request_region(ioaddr, HP_IO_EXTENT, DRV_NAME))
	return -EBUSY;

	/* Check for the HP+ signature, 50 48 0x 53. */
	if (inw(ioaddr + HP_ID) != 0x4850
	\|\| (inw(ioaddr + HP_PAGING) & 0xfff0) != 0x5300) {
	retval = -ENODEV;
	goto out;
	}

	if (ei_debug && version_printed++ == 0)
	printk(version);

	printk("%s: %s at %#3x, ", dev->name, name, ioaddr);

	/* Retrieve and checksum the station address. */
	outw(MAC_Page, ioaddr + HP_PAGING);

	for(i = 0; i < ETHER_ADDR_LEN; i++) {
	unsigned char inval = inb(ioaddr + 8 + i);
	dev->dev_addr[i] = inval;
	checksum += inval;
	}
	checksum += inb(ioaddr + 14);

	printk("%pM", dev->dev_addr);

	if (checksum != 0xff) {
	printk(" bad checksum %2.2x.\n", checksum);
	retval = -ENODEV;
	goto out;
	} else {
	/* Point at the Software Configuration Flags. */
	outw(ID_Page, ioaddr + HP_PAGING);
	printk(" ID %4.4x", inw(ioaddr + 12));
	}

	/* Read the IRQ line. */
	outw(HW_Page, ioaddr + HP_PAGING);
	{
	int irq = inb(ioaddr + 13) & 0x0f;
	int option = inw(ioaddr + HPP_OPTION);

	dev->irq = irq;
	if (option & MemEnable) {
	mem_start = inw(ioaddr + 9) << 8;
	printk(", IRQ %d, memory address %#x.\n", irq, mem_start);
	} else {
	mem_start = 0;
	printk(", IRQ %d, programmed-I/O mode.\n", irq);
	}
	}

	/* Set the wrap registers for string I/O reads. */
	outw((HP_START_PG + TX_PAGES/2) \| ((HP_STOP_PG - 1) << 8), ioaddr + 14);

	/* Set the base address to point to the NIC, not the "real" base! */
	dev->base_addr = ioaddr + NIC_OFFSET;

	dev->open = &hpp_open;
	dev->stop = &hpp_close;
	#ifdef CONFIG_NET_POLL_CONTROLLER
	dev->poll_controller = ei_poll;
	#endif

	ei_status.name = name;
	ei_status.word16 = 0; /* Agggghhhhh! Debug time: 2 days! */
	ei_status.tx_start_page = HP_START_PG;
	ei_status.rx_start_page = HP_START_PG + TX_PAGES/2;
	ei_status.stop_page = HP_STOP_PG;

	ei_status.reset_8390 = &hpp_reset_8390;
	ei_status.block_input = &hpp_io_block_input;
	ei_status.block_output = &hpp_io_block_output;
	ei_status.get_8390_hdr = &hpp_io_get_8390_hdr;

	/* Check if the memory_enable flag is set in the option register. */
	if (mem_start) {
	ei_status.block_input = &hpp_mem_block_input;
	ei_status.block_output = &hpp_mem_block_output;
	ei_status.get_8390_hdr = &hpp_mem_get_8390_hdr;
	dev->mem_start = mem_start;
	ei_status.mem = ioremap(mem_start,
	(HP_STOP_PG - HP_START_PG)*256);
	if (!ei_status.mem) {
	retval = -ENOMEM;
	goto out;
	}
	ei_status.rmem_start = dev->mem_start + TX_PAGES/2*256;
	dev->mem_end = ei_status.rmem_end
	= dev->mem_start + (HP_STOP_PG - HP_START_PG)*256;
	}

	outw(Perf_Page, ioaddr + HP_PAGING);
	NS8390p_init(dev, 0);
	/* Leave the 8390 and HP chip reset. */
	outw(inw(ioaddr + HPP_OPTION) & ~EnableIRQ, ioaddr + HPP_OPTION);

	retval = register_netdev(dev);
	if (retval)
	goto out1;
	return 0;
	out1:
	iounmap(ei_status.mem);
	out:
	release_region(ioaddr, HP_IO_EXTENT);
	return retval;
	}

	static int
	hpp_open(struct net_device *dev)
	{
	int ioaddr = dev->base_addr - NIC_OFFSET;
	int option_reg;
	int retval;

	if ((retval = request_irq(dev->irq, eip_interrupt, 0, dev->name, dev))) {
	return retval;
	}

	/* Reset the 8390 and HP chip. */
	option_reg = inw(ioaddr + HPP_OPTION);
	outw(option_reg & ~(NICReset + ChipReset), ioaddr + HPP_OPTION);
	udelay(5);
	/* Unreset the board and enable interrupts. */
	outw(option_reg \| (EnableIRQ + NICReset + ChipReset), ioaddr + HPP_OPTION);

	/* Set the wrap registers for programmed-I/O operation. */
	outw(HW_Page, ioaddr + HP_PAGING);
	outw((HP_START_PG + TX_PAGES/2) \| ((HP_STOP_PG - 1) << 8), ioaddr + 14);

	/* Select the operational page. */
	outw(Perf_Page, ioaddr + HP_PAGING);

	eip_open(dev);
	return 0;
	}

	static int
	hpp_close(struct net_device *dev)
	{
	int ioaddr = dev->base_addr - NIC_OFFSET;
	int option_reg = inw(ioaddr + HPP_OPTION);

	free_irq(dev->irq, dev);
	eip_close(dev);
	outw((option_reg & ~EnableIRQ) \| MemDisable \| NICReset \| ChipReset,
	ioaddr + HPP_OPTION);

	return 0;
	}

	static void
	hpp_reset_8390(struct net_device *dev)
	{
	int ioaddr = dev->base_addr - NIC_OFFSET;
	int option_reg = inw(ioaddr + HPP_OPTION);

	if (ei_debug > 1) printk("resetting the 8390 time=%ld...", jiffies);

	outw(option_reg & ~(NICReset + ChipReset), ioaddr + HPP_OPTION);
	/* Pause a few cycles for the hardware reset to take place. */
	udelay(5);
	ei_status.txing = 0;
	outw(option_reg \| (EnableIRQ + NICReset + ChipReset), ioaddr + HPP_OPTION);

	udelay(5);


	if ((inb_p(ioaddr+NIC_OFFSET+EN0_ISR) & ENISR_RESET) == 0)
	printk("%s: hp_reset_8390() did not complete.\n", dev->name);

	if (ei_debug > 1) printk("8390 reset done (%ld).", jiffies);
	return;
	}

	/* The programmed-I/O version of reading the 4 byte 8390 specific header.
	Note that transfer with the EtherTwist+ must be on word boundaries. */

	static void
	hpp_io_get_8390_hdr(struct net_device dev, struct e8390_pkt_hdr hdr, int ring_page)
	{
	int ioaddr = dev->base_addr - NIC_OFFSET;

	outw((ring_page<<8), ioaddr + HPP_IN_ADDR);
	insw(ioaddr + HP_DATAPORT, hdr, sizeof(struct e8390_pkt_hdr)>>1);
	}

	/* Block input and output, similar to the Crynwr packet driver. */

	static void
	hpp_io_block_input(struct net_device dev, int count, struct sk_buff skb, int ring_offset)
	{
	int ioaddr = dev->base_addr - NIC_OFFSET;
	char *buf = skb->data;

	outw(ring_offset, ioaddr + HPP_IN_ADDR);
	insw(ioaddr + HP_DATAPORT, buf, count>>1);
	if (count & 0x01)
	buf[count-1] = inw(ioaddr + HP_DATAPORT);
	}

	/* The corresponding shared memory versions of the above 2 functions. */

	static void
	hpp_mem_get_8390_hdr(struct net_device dev, struct e8390_pkt_hdr hdr, int ring_page)
	{
	int ioaddr = dev->base_addr - NIC_OFFSET;
	int option_reg = inw(ioaddr + HPP_OPTION);

	outw((ring_page<<8), ioaddr + HPP_IN_ADDR);
	outw(option_reg & ~(MemDisable + BootROMEnb), ioaddr + HPP_OPTION);
	memcpy_fromio(hdr, ei_status.mem, sizeof(struct e8390_pkt_hdr));
	outw(option_reg, ioaddr + HPP_OPTION);
	hdr->count = (le16_to_cpu(hdr->count) + 3) & ~3; /* Round up allocation. */
	}

	static void
	hpp_mem_block_input(struct net_device dev, int count, struct sk_buff skb, int ring_offset)
	{
	int ioaddr = dev->base_addr - NIC_OFFSET;
	int option_reg = inw(ioaddr + HPP_OPTION);

	outw(ring_offset, ioaddr + HPP_IN_ADDR);

	outw(option_reg & ~(MemDisable + BootROMEnb), ioaddr + HPP_OPTION);

	/* Caution: this relies on get_8390_hdr() rounding up count!
	Also note that we can't use eth_io_copy_and_sum() because
	it will not always copy "count" bytes (e.g. padded IP). */

	memcpy_fromio(skb->data, ei_status.mem, count);
	outw(option_reg, ioaddr + HPP_OPTION);
	}

	/* A special note: we must always transfer >=16 bit words.
	It's always safe to round up, so we do. */
	static void
	hpp_io_block_output(struct net_device *dev, int count,
	const unsigned char *buf, int start_page)
	{
	int ioaddr = dev->base_addr - NIC_OFFSET;
	outw(start_page << 8, ioaddr + HPP_OUT_ADDR);
	outsl(ioaddr + HP_DATAPORT, buf, (count+3)>>2);
	return;
	}

	static void
	hpp_mem_block_output(struct net_device *dev, int count,
	const unsigned char *buf, int start_page)
	{
	int ioaddr = dev->base_addr - NIC_OFFSET;
	int option_reg = inw(ioaddr + HPP_OPTION);

	outw(start_page << 8, ioaddr + HPP_OUT_ADDR);
	outw(option_reg & ~(MemDisable + BootROMEnb), ioaddr + HPP_OPTION);
	memcpy_toio(ei_status.mem, buf, (count + 3) & ~3);
	outw(option_reg, ioaddr + HPP_OPTION);

	return;
	}


	#ifdef MODULE
	#define MAX_HPP_CARDS 4 /* Max number of HPP cards per module */
	static struct net_device *dev_hpp[MAX_HPP_CARDS];
	static int io[MAX_HPP_CARDS];
	static int irq[MAX_HPP_CARDS];

	module_param_array(io, int, NULL, 0);
	module_param_array(irq, int, NULL, 0);
	MODULE_PARM_DESC(io, "I/O port address(es)");
	MODULE_PARM_DESC(irq, "IRQ number(s); ignored if properly detected");
	MODULE_DESCRIPTION("HP PC-LAN+ ISA ethernet driver");
	MODULE_LICENSE("GPL");

	/* This is set up so that only a single autoprobe takes place per call.
	ISA device autoprobes on a running machine are not recommended. */
	int __init
	init_module(void)
	{
	struct net_device *dev;
	int this_dev, found = 0;

	for (this_dev = 0; this_dev < MAX_HPP_CARDS; this_dev++) {
	if (io[this_dev] == 0) {
	if (this_dev != 0) break; /* only autoprobe 1st one */
	printk(KERN_NOTICE "hp-plus.c: Presently autoprobing (not recommended) for a single card.\n");
	}
	dev = alloc_ei_netdev();
	if (!dev)
	break;
	dev->irq = irq[this_dev];
	dev->base_addr = io[this_dev];
	if (do_hpp_probe(dev) == 0) {
	dev_hpp[found++] = dev;
	continue;
	}
	free_netdev(dev);
	printk(KERN_WARNING "hp-plus.c: No HP-Plus card found (i/o = 0x%x).\n", io[this_dev]);
	break;
	}
	if (found)
	return 0;
	return -ENXIO;
	}

	static void cleanup_card(struct net_device *dev)
	{
	/* NB: hpp_close() handles free_irq */
	iounmap(ei_status.mem);
	release_region(dev->base_addr - NIC_OFFSET, HP_IO_EXTENT);
	}

	void __exit
	cleanup_module(void)
	{
	int this_dev;

	for (this_dev = 0; this_dev < MAX_HPP_CARDS; this_dev++) {
	struct net_device *dev = dev_hpp[this_dev];
	if (dev) {
	unregister_netdev(dev);
	cleanup_card(dev);
	free_netdev(dev);
	}
	}
	}
	#endif /* MODULE */