applicom.c

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/* Derived from Applicom driver ac.c for SCO Unix                            */
/* Ported by David Woodhouse, Axiom (Cambridge) Ltd.                         */
/* [e-mail]  30/8/98                                                    */
/* $Id: ac.c,v 1.30 2000/03/22 16:03:57 dwmw2 Exp $			     */
/* This module is for Linux 2.1 and 2.2 series kernels.                      */
/*****************************************************************************/
/* J PAGET 18/02/94 passage V2.4.2 ioctl avec code 2 reset to les interrupt  */
/* ceci pour reseter correctement apres une sortie sauvage                   */
/* J PAGET 02/05/94 passage V2.4.3 dans le traitement de d'interruption,     */
/* LoopCount n'etait pas initialise a 0.                                     */
/* F LAFORSE 04/07/95 version V2.6.0 lecture bidon apres acces a une carte   */
/*           pour liberer le bus                                             */
/* J.PAGET 19/11/95 version V2.6.1 Nombre, addresse,irq n'est plus configure */
/* et passe en argument a acinit, mais est scrute sur le bus pour s'adapter  */
/* au nombre de cartes presentes sur le bus. IOCL code 6 affichait V2.4.3    */
/* F.LAFORSE 28/11/95 creation de fichiers acXX.o avec les differentes       */
/* adresses de base des cartes, IOCTL 6 plus complet                         */
/* J.PAGET le 19/08/96 copie de la version V2.6 en V2.8.0 sans modification  */
/* de code autre que le texte V2.6.1 en V2.8.0                               */
/*****************************************************************************/


#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/malloc.h>
#include <asm/errno.h>
#include <asm/io.h>
#include <asm/uaccess.h>
#include <linux/miscdevice.h>
#include <linux/pci.h>
#include <linux/wait.h>
#include <linux/init.h>
#include <linux/compatmac.h>

#include "applicom.h"

#if LINUX_VERSION_CODE < 0x20300 
/* These probably want adding to <linux/compatmac.h> */
#define init_waitqueue_head(x) do { *(x) = NULL; } while (0);
#define PCI_BASE_ADDRESS(dev) (dev->base_address[0])
#define DECLARE_WAIT_QUEUE_HEAD(x) struct wait_queue *x
#define __setup(x,y) /* */
#else
#define PCI_BASE_ADDRESS(dev) (dev->resource[0].start)
#endif

/* NOTE: We use for loops with {write,read}b() instead of 
   memcpy_{from,to}io throughout this driver. This is because
   the board doesn't correctly handle word accesses - only
   bytes. 
*/


#undef DEBUG

#define MAX_BOARD 8		/* maximum of pc board possible */
#define MAX_ISA_BOARD 4
#define LEN_RAM_IO 0x800
#define AC_MINOR 157

#ifndef PCI_VENDOR_ID_APPLICOM
#define PCI_VENDOR_ID_APPLICOM                0x1389
#define PCI_DEVICE_ID_APPLICOM_PCIGENERIC     0x0001
#define PCI_DEVICE_ID_APPLICOM_PCI2000IBS_CAN 0x0002
#define PCI_DEVICE_ID_APPLICOM_PCI2000PFB     0x0003
#endif
#define MAX_PCI_DEVICE_NUM 3

static char *applicom_pci_devnames[] = {
	"PCI board",
	"PCI2000IBS / PCI2000CAN",
	"PCI2000PFB"
};

MODULE_AUTHOR("David Woodhouse & Applicom International");
MODULE_DESCRIPTION("Driver for Applicom Profibus card");
MODULE_PARM(irq, "i");
MODULE_PARM_DESC(irq, "IRQ of the Applicom board");
MODULE_PARM(mem, "i");
MODULE_PARM_DESC(mem, "Shared Memory Address of Applicom board");

MODULE_SUPPORTED_DEVICE("ac");


struct applicom_board {
	unsigned long PhysIO;
	unsigned long RamIO;
	wait_queue_head_t FlagSleepSend;
	long irq;
	spinlock_t mutex;
} apbs[MAX_BOARD];

static unsigned int irq = 0;	/* interrupt number IRQ       */
static unsigned long mem = 0;	/* physical segment of board  */

static unsigned int numboards;	/* number of installed boards */
static volatile unsigned char Dummy;
static DECLARE_WAIT_QUEUE_HEAD(FlagSleepRec);
static unsigned int WriteErrorCount;	/* number of write error      */
static unsigned int ReadErrorCount;	/* number of read error       */
static unsigned int DeviceErrorCount;	/* number of device error     */

static loff_t ac_llseek(struct file *, loff_t, int);
static ssize_t ac_read (struct file *, char *, size_t, loff_t *);
static ssize_t ac_write (struct file *, const char *, size_t, loff_t *);
static int ac_ioctl(struct inode *, struct file *, unsigned int,
		    unsigned long);
static void ac_interrupt(int, void *, struct pt_regs *);

struct file_operations ac_fops = {
	owner:THIS_MODULE,
	llseek:ac_llseek,
	read:ac_read,
	write:ac_write,
	ioctl:ac_ioctl,
};

struct miscdevice ac_miscdev = {
	AC_MINOR,
	"ac",
	&ac_fops
};

static int dummy;	/* dev_id for request_irq() */

int ac_register_board(unsigned long physloc, unsigned long loc, 
		      unsigned char boardno)
{
	volatile unsigned char byte_reset_it;

	if((readb(loc + CONF_END_TEST)     != 0x00) ||
	   (readb(loc + CONF_END_TEST + 1) != 0x55) ||
	   (readb(loc + CONF_END_TEST + 2) != 0xAA) ||
	   (readb(loc + CONF_END_TEST + 3) != 0xFF))
		return 0;

	if (!boardno)
		boardno = readb(loc + NUMCARD_OWNER_TO_PC);

	if (!boardno && boardno > MAX_BOARD) {
		printk(KERN_WARNING "Board #%d (at 0x%lx) is out of range (1 <= x <= %d).\n",
		       boardno, physloc, MAX_BOARD);
		return 0;
	}

	if (apbs[boardno - 1].RamIO) {
		printk(KERN_WARNING "Board #%d (at 0x%lx) conflicts with previous board #%d (at 0x%lx)\n", 
		       boardno, physloc, boardno, apbs[boardno-1].PhysIO);
		return 0;
	}

	boardno--;

	apbs[boardno].PhysIO = physloc;
	apbs[boardno].RamIO = loc;
	init_waitqueue_head(&apbs[boardno].FlagSleepSend);
	spin_lock_init(&apbs[boardno].mutex);
	byte_reset_it = readb(loc + RAM_IT_TO_PC);

	numboards++;
	return boardno + 1;
}

#ifdef MODULE

#define applicom_init init_module

void cleanup_module(void)
{
	int i;

	misc_deregister(&ac_miscdev);

	for (i = 0; i < MAX_BOARD; i++) {

		if (!apbs[i].RamIO)
			continue;
		
		iounmap((void *) apbs[i].RamIO);

		if (apbs[i].irq)
			free_irq(apbs[i].irq, &dummy);
	}
}

#endif				/* MODULE */

int __init applicom_init(void)
{
	int i, numisa = 0;
	struct pci_dev *dev = NULL;
	void *RamIO;
	int boardno;

	printk(KERN_INFO "Applicom driver: $Id: ac.c,v 1.30 2000/03/22 16:03:57 dwmw2 Exp $\n");

	/* No mem and irq given - check for a PCI card */

	while ( (dev = pci_find_class(PCI_CLASS_OTHERS << 16, dev))) {

		if (dev->vendor != PCI_VENDOR_ID_APPLICOM)
			continue;
		
		if (dev->device  > MAX_PCI_DEVICE_NUM || dev->device == 0)
			continue;
		
		if (pci_enable_device(dev))
			return -EIO;

		RamIO = ioremap(PCI_BASE_ADDRESS(dev), LEN_RAM_IO);

		if (!RamIO) {
			printk(KERN_INFO "ac.o: Failed to ioremap PCI memory space at 0x%lx\n", PCI_BASE_ADDRESS(dev));
			return -EIO;
		}

		printk(KERN_INFO "Applicom %s found at mem 0x%lx, irq %d\n",
		       applicom_pci_devnames[dev->device-1], PCI_BASE_ADDRESS(dev), 
		       dev->irq);

		if (!(boardno = ac_register_board(PCI_BASE_ADDRESS(dev),
						  (unsigned long)RamIO,0))) {
			printk(KERN_INFO "ac.o: PCI Applicom device doesn't have correct signature.\n");
			iounmap(RamIO);
			continue;
		}

		if (request_irq(dev->irq, &ac_interrupt, SA_SHIRQ, "Applicom PCI", &dummy)) {
			printk(KERN_INFO "Could not allocate IRQ %d for PCI Applicom device.\n", dev->irq);
			iounmap(RamIO);
			apbs[boardno - 1].RamIO = 0;
			continue;
		}

		/* Enable interrupts. */

		writeb(0x40, apbs[boardno - 1].RamIO + RAM_IT_FROM_PC);

		apbs[boardno - 1].irq = dev->irq;
	}

	/* Finished with PCI cards. If none registered, 
	 * and there was no mem/irq specified, exit */

	if (!mem || !irq) {
		if (numboards)
			goto fin;
		else {
			printk(KERN_INFO "ac.o: No PCI boards found.\n");
			printk(KERN_INFO "ac.o: For an ISA board you must supply memory and irq parameters.\n");
			return -ENXIO;
		}
	}

	/* Now try the specified ISA cards */

	RamIO = ioremap(mem, LEN_RAM_IO * MAX_ISA_BOARD);

	if (!RamIO) 
		printk(KERN_INFO "ac.o: Failed to ioremap ISA memory space at 0x%lx\n", mem);

	for (i = 0; i < MAX_ISA_BOARD; i++) {
		RamIO = ioremap(mem + (LEN_RAM_IO * i), LEN_RAM_IO);

		if (!RamIO) {
			printk(KERN_INFO "ac.o: Failed to ioremap the ISA card's memory space (slot #%d)\n", i + 1);
			continue;
		}

		if (!(boardno = ac_register_board((unsigned long)mem+ (LEN_RAM_IO*i),
						  (unsigned long)RamIO,i+1))) {
			iounmap(RamIO);
			continue;
		}

		printk(KERN_NOTICE "Applicom ISA card found at mem 0x%lx, irq %d\n", mem + (LEN_RAM_IO*i), irq);

		if (!numisa) {
			if (request_irq(irq, &ac_interrupt, SA_SHIRQ, "Applicom ISA", &dummy)) {
				printk(KERN_WARNING "Could not allocate IRQ %d for ISA Applicom device.\n", irq);
				iounmap((void *) RamIO);
				apbs[boardno - 1].RamIO = 0;
			}
			apbs[boardno - 1].irq = irq;
		}
		else
			apbs[boardno - 1].irq = 0;

		numisa++;
	}

	if (!numisa)
		printk(KERN_WARNING"ac.o: No valid ISA Applicom boards found at mem 0x%lx\n",mem);

 fin:
	init_waitqueue_head(&FlagSleepRec);

	WriteErrorCount = 0;
	ReadErrorCount = 0;
	DeviceErrorCount = 0;

	if (numboards) {
		misc_register(&ac_miscdev);
		for (i = 0; i < MAX_BOARD; i++) {
			int serial;
			char boardname[(SERIAL_NUMBER - TYPE_CARD) + 1];

			if (!apbs[i].RamIO)
				continue;

			for (serial = 0; serial < SERIAL_NUMBER - TYPE_CARD; serial++)
				boardname[serial] = readb(apbs[i].RamIO + TYPE_CARD + serial);

			boardname[serial] = 0;


			printk(KERN_INFO "Applicom board %d: %s, PROM V%d.%d",
			       i+1, boardname,
			       (int)(readb(apbs[i].RamIO + VERS) >> 4),
			       (int)(readb(apbs[i].RamIO + VERS) & 0xF));
			
			serial = (readb(apbs[i].RamIO + SERIAL_NUMBER) << 16) + 
				(readb(apbs[i].RamIO + SERIAL_NUMBER + 1) << 8) + 
				(readb(apbs[i].RamIO + SERIAL_NUMBER + 2) );

			if (serial != 0)
				printk(" S/N %d\n", serial);
			else
				printk("\n");
		}
		return 0;
	}

	else
		return -ENXIO;
}


#ifndef MODULE
__initcall(applicom_init);
#endif

static loff_t ac_llseek(struct file *file, loff_t offset, int origin)
{
	return -ESPIPE;
}

static ssize_t ac_write(struct file *file, const char *buf, size_t count, loff_t * ppos)
{
	unsigned int NumCard;	/* Board number 1 -> 8           */
	unsigned int IndexCard;	/* Index board number 0 -> 7     */
	unsigned char TicCard;	/* Board TIC to send             */
	unsigned long flags;	/* Current priority              */
	struct st_ram_io st_loc;
	struct mailbox tmpmailbox;
#ifdef DEBUG
	int c;
#endif
	DECLARE_WAITQUEUE(wait, current);

	if (count != sizeof(struct st_ram_io) + sizeof(struct mailbox)) {
		static int warncount = 5;
		if (warncount) {
			printk(KERN_INFO "Hmmm. write() of Applicom card, length %d != expected %d\n",
			       count, sizeof(struct st_ram_io) + sizeof(struct mailbox));
			warncount--;
		}
		return -EINVAL;
	}

	if(copy_from_user(&st_loc, buf, sizeof(struct st_ram_io))) 
		return -EFAULT;
	
	if(copy_from_user(&tmpmailbox, &buf[sizeof(struct st_ram_io)],
			  sizeof(struct mailbox))) 
		return -EFAULT;

	NumCard = st_loc.num_card;	/* board number to send          */
	TicCard = st_loc.tic_des_from_pc;	/* tic number to send            */
	IndexCard = NumCard - 1;

	if((NumCard < 1) || (NumCard > MAX_BOARD) || !apbs[IndexCard].RamIO)
		return -EINVAL;

#ifdef DEBUG
	printk("Write to applicom card #%d. struct st_ram_io follows:",
	       IndexCard+1);

		for (c = 0; c < sizeof(struct st_ram_io);) {
		
			printk("\n%5.5X: %2.2X", c, ((unsigned char *) &st_loc)[c]);

			for (c++; c % 8 && c < sizeof(struct st_ram_io); c++) {
				printk(" %2.2X", ((unsigned char *) &st_loc)[c]);
			}
		}

		printk("\nstruct mailbox follows:");

		for (c = 0; c < sizeof(struct mailbox);) {
			printk("\n%5.5X: %2.2X", c, ((unsigned char *) &tmpmailbox)[c]);

			for (c++; c % 8 && c < sizeof(struct mailbox); c++) {
				printk(" %2.2X", ((unsigned char *) &tmpmailbox)[c]);
			}
		}

		printk("\n");
#endif

	spin_lock_irqsave(&apbs[IndexCard].mutex, flags);

	/* Test octet ready correct */
	if(readb(apbs[IndexCard].RamIO + DATA_FROM_PC_READY) > 2) { 
		Dummy = readb(apbs[IndexCard].RamIO + VERS);
		spin_unlock_irqrestore(&apbs[IndexCard].mutex, flags);
		printk(KERN_WARNING "APPLICOM driver write error board %d, DataFromPcReady = %d\n",
		       IndexCard,(int)readb(apbs[IndexCard].RamIO + DATA_FROM_PC_READY));
		DeviceErrorCount++;
		return -EIO;
	}
	
	/* Place ourselves on the wait queue */
	current->state = TASK_INTERRUPTIBLE;
	add_wait_queue(&apbs[IndexCard].FlagSleepSend, &wait);

	/* Check whether the card is ready for us */
	while (readb(apbs[IndexCard].RamIO + DATA_FROM_PC_READY) != 0) {
		Dummy = readb(apbs[IndexCard].RamIO + VERS);
		/* It's busy. Sleep. */