pas16.c

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	/* Now see if it looks like a PAS16 board */
	board_rev = inb(io_port + PCB_CONFIG);

	if (board_rev == 0xff)
		return 0;

	tmp = board_rev ^ 0xe0;

	outb(tmp, io_port + PCB_CONFIG);
	tmp = inb(io_port + PCB_CONFIG);
	outb(board_rev, io_port + PCB_CONFIG);

	if (board_rev != tmp)	/* Not a PAS-16 */
		return 0;

	if ((inb(io_port + OPERATION_MODE_1) & 0x03) != 0x03)
		return 0;	/* return if no SCSI interface found */

	/* Mediavision has some new model boards that return ID bits
	 * that indicate a SCSI interface, but they're not (LMS).  We'll
	 * put in an additional test to try to weed them out.
	 */

	outb(0x01, io_port + WAIT_STATE);		/* 1 Wait state       */
	NCR5380_write(MODE_REG, 0x20);			/* Is it really SCSI? */
	if (NCR5380_read(MODE_REG) != 0x20)		/* Write to a reg.    */
		return 0;				/* and try to read    */
	NCR5380_write(MODE_REG, 0x00);			/* it back.           */
	if (NCR5380_read(MODE_REG) != 0x00)
		return 0;

	return 1;
}

/**
 *	pas16_setup	-	parse command line
 *	@str: command line block
 *
 *	LILO command line initialization of the overrides array from
 *	the passed in pas16= options
 */

int __init pas16_setup(char *str, int *ints)
{
	static int commandline_current = 0;
	int i;
	int ints[10];

	get_options(str, sizeof(ints) / sizeof(int), ints);
	if (ints[0] != 2)
		printk(KERN_ERR "pas16_setup : usage pas16=io_port,irq\n");
	else if (commandline_current < NO_OVERRIDES) {
		overrides[commandline_current].io_port = (unsigned short) ints[1];
		overrides[commandline_current].irq = ints[2];
		for (i = 0; i < NO_BASES; ++i)
			if (bases[i].io_port == (unsigned short) ints[1]) {
				bases[i].noauto = 1;
				break;
			}
		++commandline_current;
	}
	return 1;
}

__setup("pas16=", pas16_setup);

/**
 *	pas16_detect	-	detect and configure a pas16
 *	@tpnt: template
 *
 *	Detects and initializes PAS16 controllers that were autoprobed, 
 *	overridden on the LILO command line, or specified at compile time.
 */

int __init pas16_detect(Scsi_Host_Template * tpnt)
{
	static int current_override = 0;
	static unsigned short current_base = 0;
	struct Scsi_Host *instance;
	unsigned short io_port;
	int count;

	tpnt->proc_name = "pas16";
	tpnt->proc_info = &pas16_proc_info;

	if (pas16_addr != 0) {
		overrides[0].io_port = pas16_addr;
		/*
		 *  This is how we avoid seeing more than
		 *  one host adapter at the same I/O port.
		 *  Cribbed shamelessly from pas16_setup().
		 */
		for (count = 0; count < NO_BASES; ++count)
			if (bases[count].io_port == pas16_addr) {
				bases[count].noauto = 1;
				break;
			}
	}
	if (pas16_irq != 0)
		overrides[0].irq = pas16_irq;

	for (count = 0; current_override < NO_OVERRIDES; ++current_override) {
		io_port = 0;

		if (overrides[current_override].io_port) {
			io_port = overrides[current_override].io_port;
			enable_board(current_override, io_port);
			init_board(io_port, overrides[current_override].irq, 1);
		}
		else
		{
			for (; !io_port && (current_base < NO_BASES); ++current_base) {
				if (!bases[current_base].noauto && pas16_hw_detect(current_base)) {
					io_port = bases[current_base].io_port;
					init_board(io_port, default_irqs[current_base], 0);
				}
			}
		}

		if (!io_port)
			break;

		instance = scsi_register(tpnt, sizeof(struct NCR5380_hostdata));
		if (instance == NULL)
			break;

		instance->io_port = io_port;

		NCR5380_init(instance, 0);

		if (overrides[current_override].irq != IRQ_AUTO)
			instance->irq = overrides[current_override].irq;
		else
			instance->irq = NCR5380_probe_irq(instance, PAS16_IRQS);

		if (instance->irq != IRQ_NONE)
			if (request_irq(instance->irq, do_pas16_intr, SA_INTERRUPT, "pas16", NULL)) {
				printk(KERN_WARNING "scsi%d : IRQ%d not free, interrupts disabled\n", instance->host_no, instance->irq);
				instance->irq = IRQ_NONE;
			}

		if (instance->irq == IRQ_NONE) {
			printk(KERN_INFO "scsi%d : interrupts not enabled. for better interactive performance,\n", instance->host_no);
			printk(KERN_INFO "scsi%d : please jumper the board for a free IRQ.\n", instance->host_no);
			/* Disable 5380 interrupts, leave drive params the same */
			outb(0x4d, io_port + SYS_CONFIG_4);
			outb((inb(io_port + IO_CONFIG_3) & 0x0f), io_port + IO_CONFIG_3);
		}

		printk(KERN_INFO "scsi%d : at 0x%04x", instance->host_no, (int)
		       instance->io_port);
		if (instance->irq == IRQ_NONE)
			printk(" interrupts disabled");
		else
			printk(" irq %d", instance->irq);
		printk(" options CAN_QUEUE=%d  CMD_PER_LUN=%d release=%d", CAN_QUEUE, CMD_PER_LUN, PAS16_PUBLIC_RELEASE);
		NCR5380_print_options(instance);
		printk("\n");

		++current_override;
		++count;
	}
	return count;
}

/**
 *	pas16_biosparam		-	generate C/H/S data
 *	@disk: Disk to set up
 *	@dev: device ident of disk
 *	@ip: array to return C/H/S mapping
 *
 *	Generates a BIOS / DOS compatible H-C-S mapping for 
 *	the specified device / size.
 */

int pas16_biosparam(Disk * disk, kdev_t dev, int *ip)
{
	int size = disk->capacity;
	ip[0] = 64;
	ip[1] = 32;
	ip[2] = size >> 11;	/* I think I have it as /(32*64) */
	if (ip[2] > 1024) {	/* yes, >, not >= */
		ip[0] = 255;
		ip[1] = 63;
		ip[2] = size / (63 * 255);
		if (ip[2] > 1023)	/* yes >1023... */
			ip[2] = 1023;
	}

	return 0;
}

/**
 *	NCR5380_pread 		-	pseudo DMA read
 *	@instance: board to read from
 *	@dst: destination for data
 *	@len: expected/max block length
 *
 *	Fast 5380 pseudo-dma read function, transfers len bytes to 
 *	dst. Unlike most boards the PAS has IRQs enabled here, which
 *	helps no end.
 */

static inline int NCR5380_pread(struct Scsi_Host *instance, unsigned char *dst, int len)
{
	unsigned char *d = dst;
	unsigned short reg = (unsigned short) (instance->io_port + P_DATA_REG_OFFSET);
	int i = len;
	int ii = 0;

	while (!(inb(instance->io_port + P_STATUS_REG_OFFSET) & P_ST_RDY))
		++ii;

	insb(reg, d, i);

	if (inb(instance->io_port + P_TIMEOUT_STATUS_REG_OFFSET) & P_TS_TIM) {
		outb(P_TS_CT, instance->io_port + P_TIMEOUT_STATUS_REG_OFFSET);
		printk(KERN_ERR "scsi%d : watchdog timer fired in NCR5380_pread()\n", instance->host_no);
		return -1;
	}
	if (ii > pas_maxi)
		pas_maxi = ii;
	return 0;
}

/**
 *	NCR5380_pwrite 		-	pseudo DMA write
 *	@instance: board to write to
 *	@src: source for data
 *	@len: expected/max block length
 *
 *	Fast 5380 pseudo-dma write function, transfers len bytes from
 *	src. Unlike most boards the PAS has IRQs enabled here, which
 *	helps no end.
 */

static inline int NCR5380_pwrite(struct Scsi_Host *instance, unsigned char *src, int len)
{
	unsigned char *s = src;
	unsigned short reg = (instance->io_port + P_DATA_REG_OFFSET);
	int i = len;
	int ii = 0;

	while (!((inb(instance->io_port + P_STATUS_REG_OFFSET)) & P_ST_RDY))
		++ii;

	outsb(reg, s, i);

	if (inb(instance->io_port + P_TIMEOUT_STATUS_REG_OFFSET) & P_TS_TIM) {
		outb(P_TS_CT, instance->io_port + P_TIMEOUT_STATUS_REG_OFFSET);
		printk(KERN_ERR "scsi%d : watchdog timer fired in NCR5380_pwrite()\n", instance->host_no);
		return -1;
	}
	if (ii > pas_maxi)
		pas_wmaxi = ii;
	return 0;
}

#include "NCR5380.c"

/* Eventually this will go into an include file, but this will be later */
static Scsi_Host_Template driver_template = MV_PAS16;

#include "scsi_module.c"

#ifdef MODULE
MODULE_PARM(pas16_addr, "h");
MODULE_PARM(pas16_irq, "i");
#endif
MODULE_LICENSE("GPL");