pas16.c

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#define AUTOSENSE
#define PSEUDO_DMA
#define BOARD_REQUIRES_NO_UDELAY	/* PAS16 needs no I/O recovery delays */
#define UNSAFE				/* Not unsafe for PAS16 -- use it */

/*
 * This driver adapted from Drew Eckhardt's Trantor T128 driver
 *
 * Copyright 1993, Drew Eckhardt
 *	Visionary Computing
 *	(Unix and Linux consulting and custom programming)
 *	[e-mail]
 *      [phone]
 *
 *  ( Based on T128 - DISTRIBUTION RELEASE 3. ) 
 *
 * Modified to work with the Pro Audio Spectrum/Studio 16
 * by John Weidman.
 *
 *
 * For more information, please consult 
 *
 * Media Vision
 * [phone]
 * [phone]
 * 
 * and 
 *
 * NCR 5380 Family
 * SCSI Protocol Controller
 * Databook
 *
 * NCR Microelectronics
 * 1635 Aeroplaza Drive
 * Colorado Springs, CO 80916
 * 1+ [phone]
 * 1+ [phone]
 */

/*
 * Options : 
 * AUTOSENSE - if defined, REQUEST SENSE will be performed automatically
 *      for commands that return with a CHECK CONDITION status. 
 *
 * LIMIT_TRANSFERSIZE - if defined, limit the pseudo-dma transfers to 512
 *      bytes at a time.  Since interrupts are disabled by default during
 *      these transfers, we might need this to give reasonable interrupt
 *      service time if the transfer size gets too large.
 *
 * PSEUDO_DMA - enables PSEUDO-DMA hardware, should give a 3-4X performance
 * increase compared to polled I/O.
 *
 * PARITY - enable parity checking.  Not supported.
 * 
 * UNSAFE - leave interrupts enabled during pseudo-DMA transfers.  This
 *	    parameter comes from the NCR5380 code.  It is NOT unsafe with
 *	    the PAS16 and you should use it.  If you don't you will have
 *	    a problem with dropped characters during high speed
 *	    communications during SCSI transfers.  If you really don't
 *	    want to use UNSAFE you can try defining LIMIT_TRANSFERSIZE or
 *	    twiddle with the transfer size in the high level code.
 *
 * The card is detected and initialized in one of several ways : 
 * 1.  Autoprobe (default) - There are many different models of
 *     the Pro Audio Spectrum/Studio 16, and I only have one of
 *     them, so this may require a little tweaking.  An interrupt
 *     is triggered to autoprobe for the interrupt line.  Note:
 *     with the newer model boards, the interrupt is set via
 *     software after reset using the default_irq for the
 *     current board number.
 *
 * 2.  With command line overrides - pas16=port,irq may be 
 *     used on the LILO command line to override the defaults.
 *
 * 3.  With the PAS16_OVERRIDE compile time define.  This is 
 *     specified as an array of address, irq tuples.  Ie, for
 *     one board at the default 0x388 address, IRQ10, I could say 
 *     -DPAS16_OVERRIDE={{0x388, 10}}
 *     NOTE:  Untested.
 *	
 * 4.  When included as a module, with arguments passed on the command line:
 *         pas16_irq=xx		the interrupt
 *         pas16_addr=xx	the port
 *     e.g. "modprobe pas16 pas16_addr=0x388 pas16_irq=5"
 *
 *     Note that if the override methods are used, place holders must
 *     be specified for other boards in the system.
 *
 *
 * Configuration notes :
 *   The current driver does not support interrupt sharing with the
 *   sound portion of the card.  If you use the same irq for the
 *   scsi port and sound you will have problems.  Either use
 *   a different irq for the scsi port or don't use interrupts
 *   for the scsi port.
 *
 *   If you have problems with your card not being recognized, use
 *   the LILO command line override.  Try to get it recognized without
 *   interrupts.  Ie, for a board at the default 0x388 base port,
 *   boot: linux pas16=0x388,255
 *
 *   IRQ_NONE (255) should be specified for no interrupt,
 *   IRQ_AUTO (254) to autoprobe for an IRQ line if overridden
 *   on the command line.
 *
 *   (IRQ_AUTO == 254, IRQ_NONE == 255 in NCR5380.h)
 */

#include <linux/module.h>

#include <asm/system.h>
#include <linux/signal.h>
#include <linux/proc_fs.h>
#include <linux/sched.h>
#include <asm/io.h>
#include <linux/blk.h>
#include "scsi.h"
#include "hosts.h"
#include "pas16.h"
#define AUTOPROBE_IRQ
#include "NCR5380.h"
#include "constants.h"
#include "sd.h"

#include <linux/stat.h>
#include <linux/init.h>

static int pas_maxi = 0;
static int pas_wmaxi = 0;
static unsigned short pas16_addr = 0;
static int pas16_irq = 0;

static int scsi_irq_translate[] = { 0, 0, 1, 2, 3, 4, 5, 6, 0, 0, 7, 8, 9, 0, 10, 11 };

/* The default_irqs array contains values used to set the irq into the
 * board via software (as must be done on newer model boards without
 * irq jumpers on the board).  The first value in the array will be
 * assigned to logical board 0, the next to board 1, etc.
 */

static int default_irqs[] __initdata = {
	PAS16_DEFAULT_BOARD_1_IRQ,
	PAS16_DEFAULT_BOARD_2_IRQ,
	PAS16_DEFAULT_BOARD_3_IRQ,
	PAS16_DEFAULT_BOARD_4_IRQ
};

static struct override {
	unsigned short io_port;
	int irq;
} overrides
#ifdef PAS16_OVERRIDE
[] __initdata = PAS16_OVERRIDE;
#else
[4] __initdata = { 
	{0, IRQ_AUTO},
	{0, IRQ_AUTO},
	{0, IRQ_AUTO},
	{0, IRQ_AUTO}
};
#endif

#define NO_OVERRIDES (sizeof(overrides) / sizeof(struct override))

static struct base {
	unsigned short io_port;
	int noauto;
} bases[] __initdata = {
	{PAS16_DEFAULT_BASE_1, 0},
	{PAS16_DEFAULT_BASE_2, 0},
	{PAS16_DEFAULT_BASE_3, 0},
	{PAS16_DEFAULT_BASE_4, 0}
};

#define NO_BASES (sizeof (bases) / sizeof (struct base))

unsigned short pas16_offset[8] = {
	0x1c00,			/* OUTPUT_DATA_REG */
	0x1c01,			/* INITIATOR_COMMAND_REG */
	0x1c02,			/* MODE_REG */
	0x1c03,			/* TARGET_COMMAND_REG */
	0x3c00,			/* STATUS_REG ro, SELECT_ENABLE_REG wo */
	0x3c01,			/* BUS_AND_STATUS_REG ro, START_DMA_SEND_REG wo */
	0x3c02,			/* INPUT_DATA_REGISTER ro, (N/A on PAS16 ?)
				 * START_DMA_TARGET_RECEIVE_REG wo
				 */
	0x3c03,			/* RESET_PARITY_INTERRUPT_REG ro,
				 * START_DMA_INITIATOR_RECEIVE_REG wo
				 */
};
/*----------------------------------------------------------------*/

/**
 * 	enable_board	-	enable a pas16 board
 *	@board_num: logical board id
 *	@port: port to assign it
 *
 *	Sets the address on new model PAS16 hardware
 */

static void __init enable_board(int board_num, unsigned short port)
{
	outb(0xbc + board_num, MASTER_ADDRESS_PTR);
	outb(port >> 2, MASTER_ADDRESS_PTR);
}

/**
 *	init_board	-	set up board
 *	@port: board address
 *	@irq: interrupt line
 *	@force_irq: if true allow scsi/audio on the same int
 *
 *	Set the board up to handle the SCSI interface
 */

static void __init init_board(unsigned short io_port, int irq, int force_irq)
{
	unsigned int tmp;
	unsigned int pas_irq_code;

	/* Initialize the SCSI part of the board */

	outb(0x30, io_port + P_TIMEOUT_COUNTER_REG);		/* Timeout counter */
	outb(0x01, io_port + P_TIMEOUT_STATUS_REG_OFFSET);	/* Reset TC */
	outb(0x01, io_port + WAIT_STATE);			/* 1 Wait state */

	NCR5380_read(RESET_PARITY_INTERRUPT_REG);

	/*
	 *	Set the SCSI interrupt pointer without mucking up the sound
	 *	interrupt pointer in the same byte.
	 */
	 
	pas_irq_code = (irq < 16) ? scsi_irq_translate[irq] : 0;
	tmp = inb(io_port + IO_CONFIG_3);

	if (((tmp & 0x0f) == pas_irq_code) && pas_irq_code > 0 && !force_irq) {
		printk(KERN_WARNING "pas16: WARNING: Can't use same irq as sound " "driver -- interrupts disabled\n");
		/* Set up the drive parameters, disable 5380 interrupts */
		outb(0x4d, io_port + SYS_CONFIG_4);
	} else {
		tmp = (tmp & 0x0f) | (pas_irq_code << 4);
		outb(tmp, io_port + IO_CONFIG_3);

		/* Set up the drive parameters and enable 5380 interrupts */
		outb(0x6d, io_port + SYS_CONFIG_4);
	}
}


/**
 *	pas16_hw_detect		-	probe for hardware
 *	@board_num: logical board ID to probe for
 *
 *	Determine if a pas16 board is present
 */

static int __init pas16_hw_detect(unsigned short board_num)
{
	unsigned char board_rev, tmp;
	unsigned short io_port = bases[board_num].io_port;

	/* See if we can find a PAS16 board at the address associated
	 * with this logical board number.
	 */

	/* First, attempt to take a newer model board out of reset and
	 * give it a base address.  This shouldn't affect older boards.
	 */
	enable_board(board_num, io_port);