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path: root/drivers/parport
Commit message (Expand)AuthorAge
* Merge git://git.kernel.org/pub/scm/linux/kernel/git/brodo/pcmcia-2.6Linus Torvalds2011-05-24
|\
| * pcmcia: Convert pcmcia_device_id declarations to constJoe Perches2011-05-06
* | Merge branch 'tty-next' of git://git.kernel.org/pub/scm/linux/kernel/git/greg...Linus Torvalds2011-05-23
|\ \ | |/ |/|
| * parport: Use request_muxed_region for IT87 probe and lockAlan Cox2011-05-06
* | parport_pc.c: correctly release the requested region for the IT887xNiels de Vos2011-04-19
|/
* Fix common misspellingsLucas De Marchi2011-03-31
* dt/sparc: Eliminate users of of_platform_{,un}register_driverGrant Likely2011-02-28
* parport: make lockdep happy with waitlist_lockAlexander Gordeev2011-01-25
* Merge branch 'for-next' of git://git.kernel.org/pub/scm/linux/kernel/git/jiko...Linus Torvalds2010-10-24
|\
| * parport_pc: show the detection of a 2 serial port ITE8874 chipNiels de Vos2010-08-24
* | Merge git://git.kernel.org/pub/scm/linux/kernel/git/brodo/pcmcia-2.6Linus Torvalds2010-10-21
|\ \
| * | pcmcia: remove obsolete and wrong commentsDominik Brodowski2010-09-29
| * | pcmcia: move driver name to struct pcmcia_driverDominik Brodowski2010-09-29
| * | pcmcia: use autoconfiguration feature for ioports and iomemDominik Brodowski2010-09-29
| * | pcmcia: introduce autoconfiguration featureDominik Brodowski2010-09-29
| * | pcmcia: convert pcmcia_request_configuration to pcmcia_enable_deviceDominik Brodowski2010-09-29
| * | pcmcia: move config_{base,index,regs} to struct pcmcia_deviceDominik Brodowski2010-09-29
| * | pcmcia: simplify IntTypeDominik Brodowski2010-09-29
* | | parport: Semaphore cleanupThomas Gleixner2010-10-12
|/ /
* | Merge branch 'next-devicetree' of git://git.secretlab.ca/git/linux-2.6Linus Torvalds2010-08-12
|\ \
| * | of/device: Replace struct of_device with struct platform_deviceGrant Likely2010-08-06
* | | parport_serial: use the PCI IRQ if offeredFr?d?ric Bri?re2010-08-11
| |/ |/|
* | Merge git://git.kernel.org/pub/scm/linux/kernel/git/brodo/pcmcia-2.6Linus Torvalds2010-08-06
|\ \ | |/ |/|
| * pcmcia: do not use io_req_t when calling pcmcia_request_io()Dominik Brodowski2010-08-03
| * pcmcia: do not use io_req_t after call to pcmcia_request_io()Dominik Brodowski2010-08-03
| * pcmcia: remove cs_types.hDominik Brodowski2010-07-30
* | of/platform: remove all of_bus_type and of_platform_bus_type referencesGrant Likely2010-07-24
* | sparc/of: Move of_device fields into struct pdev_archdataGrant Likely2010-06-28
|/
* m68k: amiga - Parallel port platform device conversionGeert Uytterhoeven2010-05-26
* Merge remote branch 'origin' into secretlab/next-devicetreeGrant Likely2010-05-22
|\
| * pcmcia: dev_node removal (write-only drivers)Dominik Brodowski2010-05-10
| * pcmcia: re-work pcmcia_request_irq()Dominik Brodowski2010-05-10
* | of: Remove duplicate fields from of_platform_driverGrant Likely2010-05-22
|/
* include cleanup: Update gfp.h and slab.h includes to prepare for breaking imp...Tejun Heo2010-03-30
* Merge branch 'for-next' into for-linusJiri Kosina2010-03-08
|\
| * Remove drivers/parport/ChangeLogJiri Kosina2010-02-18
* | serial: 8250_pci: add support for MCS9865 / SYBA 6x Serial Port CardIra W. Snyder2010-03-02
|/
* parport_pc.c: use correct length in strncmpJoe Perches2009-12-16
* Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/gee...Linus Torvalds2009-12-08
|\
| * m68k: parport_mfc3 - Not makes it a bool before the comparison.Roel Kluin2009-12-06
* | Merge git://git.kernel.org/pub/scm/linux/kernel/git/ebiederm/sysctl-2.6Linus Torvalds2009-12-08
|\ \
| * | sysctl: Drop & in front of every proc_handler.Eric W. Biederman2009-11-18
| * | sysctl drivers: Remove dead binary sysctl supportEric W. Biederman2009-11-12
| |/
* | pcmcia: rework the irq_req_t typedefDominik Brodowski2009-11-28
* | pcmcia: use dynamic debug infrastructure, deprecate CS_CHECK (misc drivers)Dominik Brodowski2009-11-09
|/
* sysctl: remove "struct file *" argument of ->proc_handlerAlexey Dobriyan2009-09-24
* parport/serial: add support for NetMos 9901 Multi-IO cardMichael Buesch2009-06-30
* parport_pc: set properly the dma_mask for parport_pc deviceFUJITA Tomonori2009-06-22
* parport_pc: after superio probing restore original register valuesJens Rottmann2009-06-22
* parport: remove driver_data direct access of struct deviceGreg Kroah-Hartman2009-06-16
generated by cgit v1.2.2 (git 2.25.0) at 2025-09-17 09:28:25 -0400
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/*
net-3-driver for the IBM LAN Adapter/A

This is an extension to the Linux operating system, and is covered by the
same GNU General Public License that covers that work.

Copyright 1999 by Alfred Arnold (alfred@ccac.rwth-aachen.de,
                                 alfred.arnold@lancom.de)

This driver is based both on the SK_MCA driver, which is itself based on the
SK_G16 and 3C523 driver.

paper sources:
  'PC Hardware: Aufbau, Funktionsweise, Programmierung' by
  Hans-Peter Messmer for the basic Microchannel stuff

  'Linux Geraetetreiber' by Allesandro Rubini, Kalle Dalheimer
  for help on Ethernet driver programming

  'DP83934CVUL-20/25 MHz SONIC-T Ethernet Controller Datasheet' by National
  Semiconductor for info on the MAC chip

  'LAN Technical Reference Ethernet Adapter Interface Version 1 Release 1.0
   Document Number SC30-3661-00' by IBM for info on the adapter itself

  Also see http://www.natsemi.com/

special acknowledgements to:
  - Bob Eager for helping me out with documentation from IBM
  - Jim Shorney for his endless patience with me while I was using
    him as a beta tester to trace down the address filter bug ;-)

  Missing things:

  -> set debug level via ioctl instead of compile-time switches
  -> I didn't follow the development of the 2.1.x kernels, so my
     assumptions about which things changed with which kernel version
     are probably nonsense

History:
  Nov 6th, 1999
  	startup from SK_MCA driver
  Dec 6th, 1999
	finally got docs about the card.  A big thank you to Bob Eager!
  Dec 12th, 1999
	first packet received
  Dec 13th, 1999
	recv queue done, tcpdump works
  Dec 15th, 1999
	transmission part works
  Dec 28th, 1999
	added usage of the isa_functions for Linux 2.3 .  Things should
	still work with 2.0.x....
  Jan 28th, 2000
	in Linux 2.2.13, the version.h file mysteriously didn't get
	included.  Added a workaround for this.  Futhermore, it now
	not only compiles as a modules ;-)
  Jan 30th, 2000
	newer kernels automatically probe more than one board, so the
	'startslot' as a variable is also needed here
  Apr 12th, 2000
	the interrupt mask register is not set 'hard' instead of individually
	setting registers, since this seems to set bits that shouldn't be
	set
  May 21st, 2000
	reset interrupt status immediately after CAM load
	add a recovery delay after releasing the chip's reset line
  May 24th, 2000
	finally found the bug in the address filter setup - damned signed
        chars!
  June 1st, 2000
	corrected version codes, added support for the latest 2.3 changes
  Oct 28th, 2002
  	cleaned up for the 2.5 tree <alan@redhat.com>

 *************************************************************************/

#include <linux/kernel.h>
#include <linux/string.h>
#include <linux/errno.h>
#include <linux/ioport.h>
#include <linux/slab.h>
#include <linux/interrupt.h>
#include <linux/delay.h>
#include <linux/time.h>
#include <linux/mca-legacy.h>
#include <linux/module.h>
#include <linux/netdevice.h>
#include <linux/etherdevice.h>
#include <linux/skbuff.h>
#include <linux/bitops.h>

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

#define _IBM_LANA_DRIVER_
#include "ibmlana.h"

#undef DEBUG

#define DRV_NAME "ibmlana"

/* ------------------------------------------------------------------------
 * global static data - not more since we can handle multiple boards and
 * have to pack all state info into the device struct!
 * ------------------------------------------------------------------------ */

static char *MediaNames[Media_Count] = {
	"10BaseT", "10Base5", "Unknown", "10Base2"
};

/* ------------------------------------------------------------------------
 * private subfunctions
 * ------------------------------------------------------------------------ */

#ifdef DEBUG
  /* dump all registers */

static void dumpregs(struct net_device *dev)
{
	int z;

	for (z = 0; z < 160; z += 2) {
		if (!(z & 15))
			printk("REGS: %04x:", z);
		printk(" %04x", inw(dev->base_addr + z));
		if ((z & 15) == 14)
			printk("\n");
	}
}

/* dump parts of shared memory - only needed during debugging */

static void dumpmem(struct net_device *dev, u32 start, u32 len)
{
	ibmlana_priv *priv = netdev_priv(dev);
	int z;

	printk("Address %04x:\n", start);
	for (z = 0; z < len; z++) {
		if ((z & 15) == 0)
			printk("%04x:", z);
		printk(" %02x", readb(priv->base + start + z));
		if ((z & 15) == 15)
			printk("\n");
	}
	if ((z & 15) != 0)
		printk("\n");
}

/* print exact time - ditto */

static void PrTime(void)
{
	struct timeval tv;

	do_gettimeofday(&tv);
	printk("%9d:%06d: ", (int) tv.tv_sec, (int) tv.tv_usec);
}
#endif				/* DEBUG */

/* deduce resources out of POS registers */

static void getaddrs(int slot, int *base, int *memlen, int *iobase,
		     int *irq, ibmlana_medium * medium)
{
	u_char pos0, pos1;

	pos0 = mca_read_stored_pos(slot, 2);
	pos1 = mca_read_stored_pos(slot, 3);

	*base = 0xc0000 + ((pos1 & 0xf0) << 9);
	*memlen = (pos1 & 0x01) ? 0x8000 : 0x4000;
	*iobase = (pos0 & 0xe0) << 7;
	switch (pos0 & 0x06) {
	case 0:
		*irq = 5;
		break;
	case 2:
		*irq = 15;
		break;
	case 4:
		*irq = 10;
		break;
	case 6:
		*irq = 11;
		break;
	}
	*medium = (pos0 & 0x18) >> 3;
}

/* wait on register value with mask and timeout */

static int wait_timeout(struct net_device *dev, int regoffs, u16 mask,
			u16 value, int timeout)
{
	unsigned long fin = jiffies + timeout;

	while (time_before(jiffies,fin))
		if ((inw(dev->base_addr + regoffs) & mask) == value)
			return 1;

	return 0;
}


/* reset the whole board */

static void ResetBoard(struct net_device *dev)
{
	unsigned char bcmval;

	/* read original board control value */

	bcmval = inb(dev->base_addr + BCMREG);

	/* set reset bit for a while */

	bcmval |= BCMREG_RESET;
	outb(bcmval, dev->base_addr + BCMREG);
	udelay(10);
	bcmval &= ~BCMREG_RESET;
	outb(bcmval, dev->base_addr + BCMREG);

	/* switch over to RAM again */

	bcmval |= BCMREG_RAMEN | BCMREG_RAMWIN;
	outb(bcmval, dev->base_addr + BCMREG);
}

/* calculate RAM layout & set up descriptors in RAM */

static void InitDscrs(struct net_device *dev)
{
	ibmlana_priv *priv = netdev_priv(dev);
	u32 addr, baddr, raddr;
	int z;
	tda_t tda;
	rda_t rda;
	rra_t rra;

	/* initialize RAM */

	memset_io(priv->base, 0xaa,
		      dev->mem_start - dev->mem_start);	/* XXX: typo? */

	/* setup n TX descriptors - independent of RAM size */

	priv->tdastart = addr = 0;
	priv->txbufstart = baddr = sizeof(tda_t) * TXBUFCNT;
	for (z = 0; z < TXBUFCNT; z++) {
		tda.status = 0;
		tda.config = 0;
		tda.length = 0;
		tda.fragcount = 1;
		tda.startlo = baddr;
		tda.starthi = 0;
		tda.fraglength = 0;
		if (z == TXBUFCNT - 1)
			tda.link = priv->tdastart;
		else
			tda.link = addr + sizeof(tda_t);
		tda.link |= 1;
		memcpy_toio(priv->base + addr, &tda, sizeof(tda_t));
		addr += sizeof(tda_t);
		baddr += PKTSIZE;
	}

	/* calculate how many receive buffers fit into remaining memory */

	priv->rxbufcnt = (dev->mem_end - dev->mem_start - baddr) / (sizeof(rra_t) + sizeof(rda_t) + PKTSIZE);

	/* calculate receive addresses */

	priv->rrastart = raddr = priv->txbufstart + (TXBUFCNT * PKTSIZE);
	priv->rdastart = addr = priv->rrastart + (priv->rxbufcnt * sizeof(rra_t));
	priv->rxbufstart = baddr = priv->rdastart + (priv->rxbufcnt * sizeof(rda_t));

	for (z = 0; z < priv->rxbufcnt; z++) {
		rra.startlo = baddr;
		rra.starthi = 0;
		rra.cntlo = PKTSIZE >> 1;
		rra.cnthi = 0;
		memcpy_toio(priv->base + raddr, &rra, sizeof(rra_t));

		rda.status = 0;
		rda.length = 0;
		rda.startlo = 0;
		rda.starthi = 0;
		rda.seqno = 0;
		if (z < priv->rxbufcnt - 1)
			rda.link = addr + sizeof(rda_t);
		else
			rda.link = 1;
		rda.inuse = 1;
		memcpy_toio(priv->base + addr, &rda, sizeof(rda_t));

		baddr += PKTSIZE;
		raddr += sizeof(rra_t);
		addr += sizeof(rda_t);
	}

	/* initialize current pointers */

	priv->nextrxdescr = 0;
	priv->lastrxdescr = priv->rxbufcnt - 1;
	priv->nexttxdescr = 0;
	priv->currtxdescr = 0;
	priv->txusedcnt = 0;
	memset(priv->txused, 0, sizeof(priv->txused));
}

/* set up Rx + Tx descriptors in SONIC */

static int InitSONIC(struct net_device *dev)
{
	ibmlana_priv *priv = netdev_priv(dev);

	/* set up start & end of resource area */

	outw(0, SONIC_URRA);
	outw(priv->rrastart, dev->base_addr + SONIC_RSA);
	outw(priv->rrastart + (priv->rxbufcnt * sizeof(rra_t)), dev->base_addr + SONIC_REA);
	outw(priv->rrastart, dev->base_addr + SONIC_RRP);
	outw(priv->rrastart, dev->base_addr + SONIC_RWP);

	/* set EOBC so that only one packet goes into one buffer */

	outw((PKTSIZE - 4) >> 1, dev->base_addr + SONIC_EOBC);

	/* let SONIC read the first RRA descriptor */

	outw(CMDREG_RRRA, dev->base_addr + SONIC_CMDREG);
	if (!wait_timeout(dev, SONIC_CMDREG, CMDREG_RRRA, 0, 2)) {
		printk(KERN_ERR "%s: SONIC did not respond on RRRA command - giving up.", dev->name);
		return 0;
	}

	/* point SONIC to the first RDA */

	outw(0, dev->base_addr + SONIC_URDA);
	outw(priv->rdastart, dev->base_addr + SONIC_CRDA);

	/* set upper half of TDA address */

	outw(0, dev->base_addr + SONIC_UTDA);

	return 1;
}

/* stop SONIC so we can reinitialize it */

static void StopSONIC(struct net_device *dev)
{
	/* disable interrupts */

	outb(inb(dev->base_addr + BCMREG) & (~BCMREG_IEN), dev->base_addr + BCMREG);
	outb(0, dev->base_addr + SONIC_IMREG);

	/* reset the SONIC */

	outw(CMDREG_RST, dev->base_addr + SONIC_CMDREG);
	udelay(10);
	outw(CMDREG_RST, dev->base_addr + SONIC_CMDREG);
}

/* initialize card and SONIC for proper operation */

static void putcam(camentry_t * cams, int *camcnt, char *addr)
{
	camentry_t *pcam = cams + (*camcnt);
	u8 *uaddr = (u8 *) addr;

	pcam->index = *camcnt;
	pcam->addr0 = (((u16) uaddr[1]) << 8) | uaddr[0];
	pcam->addr1 = (((u16) uaddr[3]) << 8) | uaddr[2];
	pcam->addr2 = (((u16) uaddr[5]) << 8) | uaddr[4];
	(*camcnt)++;
}

static void InitBoard(struct net_device *dev)
{
	ibmlana_priv *priv = netdev_priv(dev);
	int camcnt;
	camentry_t cams[16];
	u32 cammask;
	struct dev_mc_list *mcptr;
	u16 rcrval;

	/* reset the SONIC */

	outw(CMDREG_RST, dev->base_addr + SONIC_CMDREG);
	udelay(10);

	/* clear all spurious interrupts */

	outw(inw(dev->base_addr + SONIC_ISREG), dev->base_addr + SONIC_ISREG);

	/* set up the SONIC's bus interface - constant for this adapter -
	   must be done while the SONIC is in reset */

	outw(DCREG_USR1 | DCREG_USR0 | DCREG_WC1 | DCREG_DW32, dev->base_addr + SONIC_DCREG);
	outw(0, dev->base_addr + SONIC_DCREG2);

	/* remove reset form the SONIC */

	outw(0, dev->base_addr + SONIC_CMDREG);
	udelay(10);

	/* data sheet requires URRA to be programmed before setting up the CAM contents */

	outw(0, dev->base_addr + SONIC_URRA);

	/* program the CAM entry 0 to the device address */

	camcnt = 0;
	putcam(cams, &camcnt, dev->dev_addr);

	/* start putting the multicast addresses into the CAM list.  Stop if
	   it is full. */

	for (mcptr = dev->mc_list; mcptr != NULL; mcptr = mcptr->next) {
		putcam(cams, &camcnt, mcptr->dmi_addr);
		if (camcnt == 16)
			break;
	}

	/* calculate CAM mask */

	cammask = (1 << camcnt) - 1;

	/* feed CDA into SONIC, initialize RCR value (always get broadcasts) */

	memcpy_toio(priv->base, cams, sizeof(camentry_t) * camcnt);
	memcpy_toio(priv->base + (sizeof(camentry_t) * camcnt), &cammask, sizeof(cammask));

#ifdef DEBUG
	printk("CAM setup:\n");
	dumpmem(dev, 0, sizeof(camentry_t) * camcnt + sizeof(cammask));
#endif

	outw(0, dev->base_addr + SONIC_CAMPTR);
	outw(camcnt, dev->base_addr + SONIC_CAMCNT);
	outw(CMDREG_LCAM, dev->base_addr + SONIC_CMDREG);
	if (!wait_timeout(dev, SONIC_CMDREG, CMDREG_LCAM, 0, 2)) {
		printk(KERN_ERR "%s:SONIC did not respond on LCAM command - giving up.", dev->name);
		return;
	} else {
		/* clear interrupt condition */

		outw(ISREG_LCD, dev->base_addr + SONIC_ISREG);

#ifdef DEBUG
		printk("Loading CAM done, address pointers %04x:%04x\n",
		       inw(dev->base_addr + SONIC_URRA),
		       inw(dev->base_addr + SONIC_CAMPTR));
		{
			int z;

			printk("\n-->CAM: PTR %04x CNT %04x\n",
			       inw(dev->base_addr + SONIC_CAMPTR),
			       inw(dev->base_addr + SONIC_CAMCNT));
			outw(CMDREG_RST, dev->base_addr + SONIC_CMDREG);
			for (z = 0; z < camcnt; z++) {
				outw(z, dev->base_addr + SONIC_CAMEPTR);
				printk("Entry %d: %04x %04x %04x\n", z,
				       inw(dev->base_addr + SONIC_CAMADDR0),
				       inw(dev->base_addr + SONIC_CAMADDR1),
				       inw(dev->base_addr + SONIC_CAMADDR2));
			}
			outw(0, dev->base_addr + SONIC_CMDREG);
		}
#endif
	}

	rcrval = RCREG_BRD | RCREG_LB_NONE;

	/* if still multicast addresses left or ALLMULTI is set, set the multicast
	   enable bit */

	if ((dev->flags & IFF_ALLMULTI) || (mcptr != NULL))
		rcrval |= RCREG_AMC;

	/* promiscous mode ? */

	if (dev->flags & IFF_PROMISC)
		rcrval |= RCREG_PRO;

	/* program receive mode */

	outw(rcrval, dev->base_addr + SONIC_RCREG);
#ifdef DEBUG
	printk("\nRCRVAL: %04x\n", rcrval);
#endif

	/* set up descriptors in shared memory + feed them into SONIC registers */

	InitDscrs(dev);
	if (!InitSONIC(dev))
		return;

	/* reset all pending interrupts */

	outw(0xffff, dev->base_addr + SONIC_ISREG);

	/* enable transmitter + receiver interrupts */

	outw(CMDREG_RXEN, dev->base_addr + SONIC_CMDREG);
	outw(IMREG_PRXEN | IMREG_RBEEN | IMREG_PTXEN | IMREG_TXEREN, dev->base_addr + SONIC_IMREG);

	/* turn on card interrupts */

	outb(inb(dev->base_addr + BCMREG) | BCMREG_IEN, dev->base_addr + BCMREG);

#ifdef DEBUG
	printk("Register dump after initialization:\n");
	dumpregs(dev);
#endif
}

/* start transmission of a descriptor */

static void StartTx(struct net_device *dev, int descr)
{
	ibmlana_priv *priv = netdev_priv(dev);
	int addr;

	addr = priv->tdastart + (descr * sizeof(tda_t));

	/* put descriptor address into SONIC */

	outw(addr, dev->base_addr + SONIC_CTDA);

	/* trigger transmitter */

	priv->currtxdescr = descr;
	outw(CMDREG_TXP, dev->base_addr + SONIC_CMDREG);
}

/* ------------------------------------------------------------------------
 * interrupt handler(s)
 * ------------------------------------------------------------------------ */

/* receive buffer area exhausted */

static void irqrbe_handler(struct net_device *dev)
{
	ibmlana_priv *priv = netdev_priv(dev);

	/* point the SONIC back to the RRA start */

	outw(priv->rrastart, dev->base_addr + SONIC_RRP);
	outw(priv->rrastart, dev->base_addr + SONIC_RWP);
}

/* receive interrupt */

static void irqrx_handler(struct net_device *dev)
{
	ibmlana_priv *priv = netdev_priv(dev);
	rda_t rda;
	u32 rdaaddr, lrdaaddr;

	/* loop until ... */

	while (1) {
		/* read descriptor that was next to be filled by SONIC */

		rdaaddr = priv->rdastart + (priv->nextrxdescr * sizeof(rda_t));
		lrdaaddr = priv->rdastart + (priv->lastrxdescr * sizeof(rda_t));
		memcpy_fromio(&rda, priv->base + rdaaddr, sizeof(rda_t));

		/* iron out upper word halves of fields we use - SONIC will duplicate
		   bits 0..15 to 16..31 */

		rda.status &= 0xffff;
		rda.length &= 0xffff;
		rda.startlo &= 0xffff;

		/* stop if the SONIC still owns it, i.e. there is no data for us */

		if (rda.inuse)
			break;

		/* good packet? */

		else if (rda.status & RCREG_PRX) {
			struct sk_buff *skb;

			/* fetch buffer */

			skb = dev_alloc_skb(rda.length + 2);
			if (skb == NULL)
				dev->stats.rx_dropped++;
			else {
				/* copy out data */

				memcpy_fromio(skb_put(skb, rda.length),
					       priv->base +
					       rda.startlo, rda.length);

				/* set up skb fields */

				skb->protocol = eth_type_trans(skb, dev);
				skb->ip_summed = CHECKSUM_NONE;

				/* bookkeeping */
				dev->last_rx = jiffies;
				dev->stats.rx_packets++;
				dev->stats.rx_bytes += rda.length;

				/* pass to the upper layers */
				netif_rx(skb);
			}
		}

		/* otherwise check error status bits and increase statistics */

		else {
			dev->stats.rx_errors++;
			if (rda.status & RCREG_FAER)
				dev->stats.rx_frame_errors++;
			if (rda.status & RCREG_CRCR)
				dev->stats.rx_crc_errors++;
		}

		/* descriptor processed, will become new last descriptor in queue */

		rda.link = 1;
		rda.inuse = 1;
		memcpy_toio(priv->base + rdaaddr, &rda,
			     sizeof(rda_t));

		/* set up link and EOL = 0 in currently last descriptor. Only write
		   the link field since the SONIC may currently already access the
		   other fields. */

		memcpy_toio(priv->base + lrdaaddr + 20, &rdaaddr, 4);

		/* advance indices */

		priv->lastrxdescr = priv->nextrxdescr;
		if ((++priv->nextrxdescr) >= priv->rxbufcnt)
			priv->nextrxdescr = 0;
	}
}

/* transmit interrupt */

static void irqtx_handler(struct net_device *dev)
{
	ibmlana_priv *priv = netdev_priv(dev);
	tda_t tda;

	/* fetch descriptor (we forgot the size ;-) */
	memcpy_fromio(&tda, priv->base + priv->tdastart + (priv->currtxdescr * sizeof(tda_t)), sizeof(tda_t));

	/* update statistics */
	dev->stats.tx_packets++;
	dev->stats.tx_bytes += tda.length;

	/* update our pointers */
	priv->txused[priv->currtxdescr] = 0;
	priv->txusedcnt--;

	/* if there are more descriptors present in RAM, start them */
	if (priv->txusedcnt > 0)
		StartTx(dev, (priv->currtxdescr + 1) % TXBUFCNT);

	/* tell the upper layer we can go on transmitting */
	netif_wake_queue(dev);
}

static void irqtxerr_handler(struct net_device *dev)
{
	ibmlana_priv *priv = netdev_priv(dev);
	tda_t tda;

	/* fetch descriptor to check status */
	memcpy_fromio(&tda, priv->base + priv->tdastart + (priv->currtxdescr * sizeof(tda_t)), sizeof(tda_t));

	/* update statistics */
	dev->stats.tx_errors++;
	if (tda.status & (TCREG_NCRS | TCREG_CRSL))
		dev->stats.tx_carrier_errors++;
	if (tda.status & TCREG_EXC)
		dev->stats.tx_aborted_errors++;
	if (tda.status & TCREG_OWC)
		dev->stats.tx_window_errors++;
	if (tda.status & TCREG_FU)
		dev->stats.tx_fifo_errors++;

	/* update our pointers */
	priv->txused[priv->currtxdescr] = 0;
	priv->txusedcnt--;

	/* if there are more descriptors present in RAM, start them */
	if (priv->txusedcnt > 0)
		StartTx(dev, (priv->currtxdescr + 1) % TXBUFCNT);

	/* tell the upper layer we can go on transmitting */
	netif_wake_queue(dev);
}

/* general interrupt entry */

static irqreturn_t irq_handler(int irq, void *device)
{
	struct net_device *dev = (struct net_device *) device;
	u16 ival;

	/* in case we're not meant... */
	if (!(inb(dev->base_addr + BCMREG) & BCMREG_IPEND))
		return IRQ_NONE;

	/* loop through the interrupt bits until everything is clear */
	while (1) {
		ival = inw(dev->base_addr + SONIC_ISREG);

		if (ival & ISREG_RBE) {
			irqrbe_handler(dev);
			outw(ISREG_RBE, dev->base_addr + SONIC_ISREG);
		}
		if (ival & ISREG_PKTRX) {
			irqrx_handler(dev);
			outw(ISREG_PKTRX, dev->base_addr + SONIC_ISREG);
		}
		if (ival & ISREG_TXDN) {
			irqtx_handler(dev);
			outw(ISREG_TXDN, dev->base_addr + SONIC_ISREG);
		}
		if (ival & ISREG_TXER) {
			irqtxerr_handler(dev);
			outw(ISREG_TXER, dev->base_addr + SONIC_ISREG);
		}
		break;
	}
	return IRQ_HANDLED;
}

/* ------------------------------------------------------------------------
 * driver methods
 * ------------------------------------------------------------------------ */

/* MCA info */

static int ibmlana_getinfo(char *buf, int slot, void *d)
{
	int len = 0, i;
	struct net_device *dev = (struct net_device *) d;
	ibmlana_priv *priv;

	/* can't say anything about an uninitialized device... */

	if (dev == NULL)
		return len;
	priv = netdev_priv(dev);

	/* print info */

	len += sprintf(buf + len, "IRQ: %d\n", priv->realirq);
	len += sprintf(buf + len, "I/O: %#lx\n", dev->base_addr);
	len += sprintf(buf + len, "Memory: %#lx-%#lx\n", dev->mem_start, dev->mem_end - 1);
	len += sprintf(buf + len, "Transceiver: %s\n", MediaNames[priv->medium]);
	len += sprintf(buf + len, "Device: %s\n", dev->name);
	len += sprintf(buf + len, "MAC address:");
	for (i = 0; i < 6; i++)
		len += sprintf(buf + len, " %02x", dev->dev_addr[i]);
	buf[len++] = '\n';
	buf[len] = 0;

	return len;
}

/* open driver.  Means also initialization and start of LANCE */

static int ibmlana_open(struct net_device *dev)
{
	int result;
	ibmlana_priv *priv = netdev_priv(dev);

	/* register resources - only necessary for IRQ */

	result = request_irq(priv->realirq, irq_handler, IRQF_SHARED | IRQF_SAMPLE_RANDOM, dev->name, dev);
	if (result != 0) {
		printk(KERN_ERR "%s: failed to register irq %d\n", dev->name, dev->irq);
		return result;
	}
	dev->irq = priv->realirq;

	/* set up the card and SONIC */
	InitBoard(dev);

	/* initialize operational flags */
	netif_start_queue(dev);
	return 0;
}

/* close driver.  Shut down board and free allocated resources */

static int ibmlana_close(struct net_device *dev)
{
	/* turn off board */

	/* release resources */
	if (dev->irq != 0)
		free_irq(dev->irq, dev);
	dev->irq = 0;
	return 0;
}

/* transmit a block. */

static int ibmlana_tx(struct sk_buff *skb, struct net_device *dev)
{
	ibmlana_priv *priv = netdev_priv(dev);
	int retval = 0, tmplen, addr;
	unsigned long flags;
	tda_t tda;
	int baddr;

	/* find out if there are free slots for a frame to transmit. If not,
	   the upper layer is in deep desperation and we simply ignore the frame. */

	if (priv->txusedcnt >= TXBUFCNT) {
		retval = -EIO;
		dev->stats.tx_dropped++;
		goto tx_done;
	}

	/* copy the frame data into the next free transmit buffer - fillup missing */
	tmplen = skb->len;
	if (tmplen < 60)
		tmplen = 60;
	baddr = priv->txbufstart + (priv->nexttxdescr * PKTSIZE);
	memcpy_toio(priv->base + baddr, skb->data, skb->len);

	/* copy filler into RAM - in case we're filling up...
	   we're filling a bit more than necessary, but that doesn't harm
	   since the buffer is far larger...
	   Sorry Linus for the filler string but I couldn't resist ;-) */

	if (tmplen > skb->len) {
		char *fill = "NetBSD is a nice OS too! ";
		unsigned int destoffs = skb->len, l = strlen(fill);

		while (destoffs < tmplen) {
			memcpy_toio(priv->base + baddr + destoffs, fill, l);
			destoffs += l;
		}
	}

	/* set up the new frame descriptor */
	addr = priv->tdastart + (priv->nexttxdescr * sizeof(tda_t));
	memcpy_fromio(&tda, priv->base + addr, sizeof(tda_t));
	tda.length = tda.fraglength = tmplen;
	memcpy_toio(priv->base + addr, &tda, sizeof(tda_t));

	/* if there were no active descriptors, trigger the SONIC */
	spin_lock_irqsave(&priv->lock, flags);

	priv->txusedcnt++;
	priv->txused[priv->nexttxdescr] = 1;

	/* are all transmission slots used up ? */
	if (priv->txusedcnt >= TXBUFCNT)
		netif_stop_queue(dev);

	if (priv->txusedcnt == 1)
		StartTx(dev, priv->nexttxdescr);
	priv->nexttxdescr = (priv->nexttxdescr + 1) % TXBUFCNT;

	spin_unlock_irqrestore(&priv->lock, flags);
tx_done:
	dev_kfree_skb(skb);
	return retval;
}

/* switch receiver mode. */

static void ibmlana_set_multicast_list(struct net_device *dev)
{
	/* first stop the SONIC... */
	StopSONIC(dev);
	/* ...then reinit it with the new flags */
	InitBoard(dev);
}

/* ------------------------------------------------------------------------
 * hardware check
 * ------------------------------------------------------------------------ */

static int startslot;		/* counts through slots when probing multiple devices */

static int ibmlana_probe(struct net_device *dev)
{
	int slot, z;
	int base = 0, irq = 0, iobase = 0, memlen = 0;
	ibmlana_priv *priv;
	ibmlana_medium medium;
	DECLARE_MAC_BUF(mac);

	/* can't work without an MCA bus ;-) */
	if (MCA_bus == 0)
		return -ENODEV;

	base = dev->mem_start;
	irq = dev->irq;

	for (slot = startslot; (slot = mca_find_adapter(IBM_LANA_ID, slot)) != -1; slot++) {
		/* deduce card addresses */
		getaddrs(slot, &base, &memlen, &iobase, &irq, &medium);

		/* slot already in use ? */
		if (mca_is_adapter_used(slot))
			continue;
		/* were we looking for something different ? */
		if (dev->irq && dev->irq != irq)
			continue;
		if (dev->mem_start && dev->mem_start != base)
			continue;
		/* found something that matches */
		break;
	}

	/* nothing found ? */
	if (slot == -1)
		return (base != 0 || irq != 0) ? -ENXIO : -ENODEV;

	/* announce success */
	printk(KERN_INFO "%s: IBM LAN Adapter/A found in slot %d\n", dev->name, slot + 1);

	/* try to obtain I/O range */
	if (!request_region(iobase, IBM_LANA_IORANGE, DRV_NAME)) {
		printk(KERN_ERR "%s: cannot allocate I/O range at %#x!\n", DRV_NAME, iobase);
		startslot = slot + 1;
		return -EBUSY;
	}

	priv = netdev_priv(dev);
	priv->slot = slot;
	priv->realirq = irq;
	priv->medium = medium;
	spin_lock_init(&priv->lock);


	/* set base + irq for this device (irq not allocated so far) */

	dev->irq = 0;
	dev->mem_start = base;
	dev->mem_end = base + memlen;
	dev->base_addr = iobase;

	priv->base = ioremap(base, memlen);
	if (!priv->base) {
		printk(KERN_ERR "%s: cannot remap memory!\n", DRV_NAME);
		startslot = slot + 1;
		release_region(iobase, IBM_LANA_IORANGE);
		return -EBUSY;
	}

	/* make procfs entries */
	mca_set_adapter_name(slot, "IBM LAN Adapter/A");
	mca_set_adapter_procfn(slot, (MCA_ProcFn) ibmlana_getinfo, dev);

	mca_mark_as_used(slot);

	/* set methods */

	dev->open = ibmlana_open;
	dev->stop = ibmlana_close;
	dev->hard_start_xmit = ibmlana_tx;
	dev->do_ioctl = NULL;
	dev->set_multicast_list = ibmlana_set_multicast_list;
	dev->flags |= IFF_MULTICAST;

	/* copy out MAC address */

	for (z = 0; z < sizeof(dev->dev_addr); z++)
		dev->dev_addr[z] = inb(dev->base_addr + MACADDRPROM + z);

	/* print config */

	printk(KERN_INFO "%s: IRQ %d, I/O %#lx, memory %#lx-%#lx, "
	       "MAC address %s.\n",
	       dev->name, priv->realirq, dev->base_addr,
	       dev->mem_start, dev->mem_end - 1,
	       print_mac(mac, dev->dev_addr));
	printk(KERN_INFO "%s: %s medium\n", dev->name, MediaNames[priv->medium]);

	/* reset board */

	ResetBoard(dev);

	/* next probe will start at next slot */

	startslot = slot + 1;

	return 0;
}

/* ------------------------------------------------------------------------
 * modularization support
 * ------------------------------------------------------------------------ */

#ifdef MODULE

#define DEVMAX 5

static struct net_device *moddevs[DEVMAX];
static int irq;
static int io;

module_param(irq, int, 0);
module_param(io, int, 0);
MODULE_PARM_DESC(irq, "IBM LAN/A IRQ number");
MODULE_PARM_DESC(io, "IBM LAN/A I/O base address");
MODULE_LICENSE("GPL");

int init_module(void)
{
	int z;

	startslot = 0;
	for (z = 0; z < DEVMAX; z++) {
		struct net_device *dev = alloc_etherdev(sizeof(ibmlana_priv));
		if (!dev)
			break;
		dev->irq = irq;
		dev->base_addr = io;
		if (ibmlana_probe(dev)) {
			free_netdev(dev);
			break;
		}
		if (register_netdev(dev)) {
			ibmlana_priv *priv = netdev_priv(dev);
			release_region(dev->base_addr, IBM_LANA_IORANGE);
			mca_mark_as_unused(priv->slot);
			mca_set_adapter_name(priv->slot, "");
			mca_set_adapter_procfn(priv->slot, NULL, NULL);
			iounmap(priv->base);
			free_netdev(dev);
			break;
		}
		moddevs[z] = dev;
	}
	return (z > 0) ? 0 : -EIO;
}

void cleanup_module(void)
{
	int z;
	for (z = 0; z < DEVMAX; z++) {
		struct net_device *dev = moddevs[z];
		if (dev) {
			ibmlana_priv *priv = netdev_priv(dev);
			unregister_netdev(dev);
			/*DeinitBoard(dev); */
			release_region(dev->base_addr, IBM_LANA_IORANGE);
			mca_mark_as_unused(priv->slot);
			mca_set_adapter_name(priv->slot, "");
			mca_set_adapter_procfn(priv->slot, NULL, NULL);
			iounmap(priv->base);
			free_netdev(dev);
		}
	}
}
#endif				/* MODULE */
generated by cgit v1.2.2 (git 2.25.0) at 2025-09-17 09:28:21 -0400