pas16.c

基于组件方式开发操作系统的OSKIT源代码

#define AUTOSENSE
#define PSEUDO_DMA
#define FOO
#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.
 * 
 * SCSI2 - enable support for SCSI-II tagged queueing.  Untested.
 *
 * 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.
 *
 * USLEEP - enable support for devices that don't disconnect.  Untested.
 *
 * 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)
 */
 
#ifdef MODULE
#include <linux/module.h>
#endif

#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>

struct proc_dir_entry proc_scsi_pas16 = {
    PROC_SCSI_PAS16, 5, "pas16",
    S_IFDIR | S_IRUGO | S_IXUGO, 2
};
static int pas_maxi = 0;
static int pas_wmaxi = 0;
static unsigned short pas16_addr = 0;
static int pas16_irq = 0;
 

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.
 */
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
		    */
    };
/*----------------------------------------------------------------*/
/* the following will set the monitor border color (useful to find
 where something crashed or gets stuck at */
/* 1 = blue
 2 = green
 3 = cyan
 4 = red
 5 = magenta
 6 = yellow
 7 = white
*/
#if 1
#define rtrc(i) {inb(0x3da); outb(0x31, 0x3c0); outb((i), 0x3c0);}
#else
#define rtrc(i) {}
#endif


/*
 * Function : enable_board( int  board_num, unsigned short port )
 *
 * Purpose :  set address in new model board
 *
 * Inputs : board_num - logical board number 0-3, port - base address
 *
 */

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



/*
 * Function : init_board( unsigned short port, int irq )
 *
 * Purpose :  Set the board up to handle the SCSI interface
 *
 * Inputs : port - base address of the board,
 *	    irq - irq to assign to the SCSI port
 *	    force_irq - set it even if it conflicts with sound driver
 *
 */

__initfunc (static void
	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( "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 );
	}
}


/*
 * Function : pas16_hw_detect( unsigned short board_num )
 *
 * Purpose : determine if a pas16 board is present
 * 
 * Inputs : board_num - logical board number ( 0 - 3 )
 *
 * Returns : 0 if board not found, 1 if found.
 */

__initfunc(static int
     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.
     */