g_ncr5380.c

GNU Mach 微内核源代码, 基于美国卡内基美隆大学的 Mach 研究项目

/*
 * Generic Generic NCR5380 driver
 *	
 * Copyright 1993, Drew Eckhardt
 *	Visionary Computing
 *	(Unix and Linux consulting and custom programming)
 *	[e-mail]
 *      [phone]
 *
 * NCR53C400 extensions (c) 1994,1995,1996, Kevin Lentin
 *    [e-mail]
 *
 * ALPHA RELEASE 1. 
 *
 * For more information, please consult 
 *
 * NCR 5380 Family
 * SCSI Protocol Controller
 * Databook
 *
 * NCR Microelectronics
 * 1635 Aeroplaza Drive
 * Colorado Springs, CO 80916
 * 1+ [phone]
 * 1+ [phone]
 */

/* 
 * TODO : flesh out DMA support, find some one actually using this (I have
 * 	a memory mapped Trantor board that works fine)
 */

/*
 * Options :
 *
 * PARITY - enable parity checking.  Not supported.
 *
 * SCSI2 - enable support for SCSI-II tagged queueing.  Untested.
 *
 * USLEEP - enable support for devices that don't disconnect.  Untested.
 *
 * The card is detected and initialized in one of several ways : 
 * 1.  With command line overrides - NCR5380=port,irq may be 
 *     used on the LILO command line to override the defaults.
 *
 * 2.  With the GENERIC_NCR5380_OVERRIDE compile time define.  This is 
 *     specified as an array of address, irq, dma, board tuples.  Ie, for
 *     one board at 0x350, IRQ5, no dma, I could say  
 *     -DGENERIC_NCR5380_OVERRIDE={{0xcc000, 5, DMA_NONE, BOARD_NCR5380}}
 * 
 * -1 should be specified for no or DMA interrupt, -2 to autoprobe for an 
 * 	IRQ line if overridden on the command line.
 *
 * 3.  When included as a module, with arguments passed on the command line:
 *         ncr_irq=xx	the interrupt
 *         ncr_addr=xx  the port or base address (for port or memory
 *              	mapped, resp.)
 *         ncr_dma=xx	the DMA
 *         ncr_5380=1	to set up for a NCR5380 board
 *         ncr_53c400=1	to set up for a NCR53C400 board
 *     e.g.
 *     modprobe g_NCR5380 ncr_irq=5 ncr_addr=0x350 ncr_5380=1
 *       for a port mapped NCR5380 board or
 *     modprobe g_NCR5380 ncr_irq=255 ncr_addr=0xc8000 ncr_53c400=1
 *       for a memory mapped NCR53C400 board with interrupts disabled.
 * 
 * 255 should be specified for no or DMA interrupt, 254 to autoprobe for an 
 * 	IRQ line if overridden on the command line.
 *     
 */
 
/*
 * $Log: g_NCR5380.c,v $
 * Revision 1.1  1999/04/26 05:54:33  tb
 * 1998-11-30  OKUJI Yoshinori  <[e-mail]>
 *
 * 	Clean up linux emulation code to make it architecture-independent
 * 	as much as possible.
 *
 * 	* linux: Renamed from linuxdev.
 * 	* Makefile.in (objfiles): Add linux.o instead of linuxdev.o.
 * 	(MAKE): New variable. Used for the linux.o target.
 * 	* configure.in: Add AC_CHECK_TOOL(MAKE, make).
 * 	* i386/i386/spl.h: Include <i386/ipl.h>, for compatibility with
 * 	OSF Mach 3.0. Suggested by Elgin Lee <[e-mail]>.
 * 	* linux/src: Renamed from linux/linux.
 * 	* linux/dev: Renamed from linux/mach.
 * 	* linux/Drivers.in (AC_INIT): Use dev/include/linux/autoconf.h,
 * 	instead of mach/include/linux/autoconf.h.
 * 	* Makefile.in (all): Target ../linux.o instead of ../linuxdev.o.
 * 	* linux/dev/drivers/block/genhd.c: Include <machine/spl.h> instead
 * 	of <i386/ipl.h>.
 * 	* linux/dev/drivers/net/auto_irq.c: Remove unneeded header files,
 * 	<i386/ipl.h> and <i386/pic.h>.
 * 	* linux/dev/init/main.c: Many i386-dependent codes moved to ...
 * 	* linux/dev/arch/i386/irq.c: ... here.
 * 	* linux/dev/arch/i386/setup.c: New file.
 * 	* linux/dev/arch/i386/linux_emul.h: Likewise.
 * 	* linux/dev/arch/i386/glue/timer.c: Merged into sched.c.
 * 	* linux/dev/arch/i386/glue/sched.c: Include <machine/spl.h> instead
 * 	of <i386/ipl.h>, and moved to ...
 * 	* linux/dev/kernel/sched.c: ... here.
 * 	* linux/dev/arch/i386/glue/block.c: Include <machine/spl.h> and
 * 	<linux_emul.h>, instead of i386-dependent header files, and
 * 	moved to ...
 * 	* linux/dev/glue/blocl.c: ... here.
 * 	* linux/dev/arch/i386/glue/net.c: Include <machine/spl.h> and
 * 	<linux_emul.h>, instead of i386-dependent header files, and
 * 	moved to ...
 * 	* linux/dev/glue/net.c: ... here.
 * 	* linux/dev/arch/i386/glue/misc.c: Remove `x86' and moved to ...
 * 	* linux/dev/glue/misc.c: ... here.
 * 	* linux/dev/arch/i386/glue/kmem.c: Moved to ...
 * 	* linux/dev/glue/kmem.c: ... here.
 *
 */

#define AUTOPROBE_IRQ
#define AUTOSENSE

#include <linux/config.h>

#ifdef CONFIG_SCSI_GENERIC_NCR53C400
#define NCR53C400_PSEUDO_DMA 1
#define PSEUDO_DMA
#define NCR53C400
#define NCR5380_STATS
#undef NCR5380_STAT_LIMIT
#endif
#if defined(CONFIG_SCSI_G_NCR5380_PORT) && defined(CONFIG_SCSI_G_NCR5380_MEM)
#error You can not configure the Generic NCR 5380 SCSI Driver for memory mapped I/O and port mapped I/O at the same time (yet)
#endif
#if !defined(CONFIG_SCSI_G_NCR5380_PORT) && !defined(CONFIG_SCSI_G_NCR5380_MEM)
#error You must configure the Generic NCR 5380 SCSI Driver for one of memory mapped I/O and port mapped I/O.
#endif

#include <asm/system.h>
#include <asm/io.h>
#include <linux/signal.h>
#include <linux/sched.h>
#include <linux/blk.h>
#include "scsi.h"
#include "hosts.h"
#include "g_NCR5380.h"
#include "NCR5380.h"
#include "constants.h"
#include "sd.h"
#include<linux/stat.h>

struct proc_dir_entry proc_scsi_g_ncr5380 = {
    PROC_SCSI_GENERIC_NCR5380, 9, "g_NCR5380",
    S_IFDIR | S_IRUGO | S_IXUGO, 2
};

#define NCR_NOT_SET 0
static int ncr_irq=NCR_NOT_SET;
static int ncr_dma=NCR_NOT_SET;
static int ncr_addr=NCR_NOT_SET;
static int ncr_5380=NCR_NOT_SET;
static int ncr_53c400=NCR_NOT_SET;

static struct override {
	NCR5380_implementation_fields;
    int irq;
    int dma;
    int board;	/* Use NCR53c400, Ricoh, etc. extensions ? */
} overrides 
#ifdef GENERIC_NCR5380_OVERRIDE 
    [] = GENERIC_NCR5380_OVERRIDE
#else
    [1] = {{0,},};
#endif

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

/*
 * Function : static internal_setup(int board, char *str, int *ints)
 *
 * Purpose : LILO command line initialization of the overrides array,
 * 
 * Inputs : board - either BOARD_NCR5380 for a normal NCR5380 board, 
 * 	or BOARD_NCR53C400 for a NCR53C400 board. str - unused, ints - 
 *	array of integer parameters with ints[0] equal to the number of ints.
 *
 */

static void internal_setup(int board, char *str, int *ints) {
    static int commandline_current = 0;
    switch (board) {
    case BOARD_NCR5380:
	if (ints[0] != 2 && ints[0] != 3) {
	    printk("generic_NCR5380_setup : usage ncr5380=" STRVAL(NCR5380_map_name) ",irq,dma\n");
	    return;
	}
    case BOARD_NCR53C400:
	if (ints[0] != 2) {
	    printk("generic_NCR53C400_setup : usage ncr53c400=" STRVAL(NCR5380_map_name) ",irq\n");
	    return;
	}
    }

    if (commandline_current < NO_OVERRIDES) {
	overrides[commandline_current].NCR5380_map_name = (NCR5380_map_type)ints[1];
	overrides[commandline_current].irq = ints[2];
	if (ints[0] == 3) 
	    overrides[commandline_current].dma = ints[3];
	else 
	    overrides[commandline_current].dma = DMA_NONE;
	overrides[commandline_current].board = board;
	    ++commandline_current;
    }
}

/*
 * Function : generic_NCR5380_setup (char *str, int *ints)
 *
 * Purpose : LILO command line initialization of the overrides array,
 * 
 * Inputs : str - unused, ints - array of integer parameters with ints[0] 
 * 	equal to the number of ints.
 */

void generic_NCR5380_setup (char *str, int *ints) {
    internal_setup (BOARD_NCR5380, str, ints);
}

/*
 * Function : generic_NCR53C400_setup (char *str, int *ints)
 *
 * Purpose : LILO command line initialization of the overrides array,
 * 
 * Inputs : str - unused, ints - array of integer parameters with ints[0] 
 * 	equal to the number of ints.
 */

void generic_NCR53C400_setup (char *str, int *ints) {
    internal_setup (BOARD_NCR53C400, str, ints);
}

/* 
 * Function : int generic_NCR5380_detect(Scsi_Host_Template * tpnt)
 *
 * Purpose : initializes generic NCR5380 driver based on the 
 *	command line / compile time port and irq definitions.
 *
 * Inputs : tpnt - template for this SCSI adapter.
 * 
 * Returns : 1 if a host adapter was found, 0 if not.
 *
 */

int generic_NCR5380_detect(Scsi_Host_Template * tpnt) {
    static int current_override = 0;
    int count;
    int flags = 0;
    struct Scsi_Host *instance;

    if (ncr_irq != NCR_NOT_SET)
	overrides[0].irq=ncr_irq;
    if (ncr_dma != NCR_NOT_SET)
	overrides[0].dma=ncr_dma;
    if (ncr_addr != NCR_NOT_SET)
	overrides[0].NCR5380_map_name=(NCR5380_map_type)ncr_addr;
    if (ncr_5380 != NCR_NOT_SET)
	overrides[0].board=BOARD_NCR5380;
    else if (ncr_53c400 != NCR_NOT_SET)
	overrides[0].board=BOARD_NCR53C400;

    tpnt->proc_dir = &proc_scsi_g_ncr5380;

    for (count = 0; current_override < NO_OVERRIDES; ++current_override) {
	if (!(overrides[current_override].NCR5380_map_name))
	    continue;

	switch (overrides[current_override].board) {
	case BOARD_NCR5380:
	    flags = FLAG_NO_PSEUDO_DMA;
	    break;
	case BOARD_NCR53C400:
	    flags = FLAG_NCR53C400;
	    break;
	}

	instance = scsi_register (tpnt, sizeof(struct NCR5380_hostdata));
	instance->NCR5380_instance_name = overrides[current_override].NCR5380_map_name;

	NCR5380_init(instance, flags);

	if (overrides[current_override].irq != IRQ_AUTO)
	    instance->irq = overrides[current_override].irq;
	else 
	    instance->irq = NCR5380_probe_irq(instance, 0xffff);

	if (instance->irq != IRQ_NONE) 
	    if (request_irq(instance->irq, generic_NCR5380_intr, SA_INTERRUPT, "NCR5380", NULL)) {
		printk("scsi%d : IRQ%d not free, interrupts disabled\n", 
		    instance->host_no, instance->irq);
		instance->irq = IRQ_NONE;
	    } 

	if (instance->irq == IRQ_NONE) {
	    printk("scsi%d : interrupts not enabled. for better interactive performance,\n", instance->host_no);
	    printk("scsi%d : please jumper the board for a free IRQ.\n", instance->host_no);
	}

	printk("scsi%d : at " STRVAL(NCR5380_map_name) " 0x%x", instance->host_no, (unsigned int)instance->NCR5380_instance_name);
	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, GENERIC_NCR5380_PUBLIC_RELEASE);
	NCR5380_print_options(instance);
	printk("\n");

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

const char * generic_NCR5380_info (struct Scsi_Host* host) {
    static const char string[]="Generic NCR5380/53C400 Driver";
    return string;
}

int generic_NCR5380_release_resources(struct Scsi_Host * instance)
{
    NCR5380_local_declare();

    NCR5380_setup(instance);

    if (instance->irq != IRQ_NONE)
	free_irq(instance->irq, NULL);

	return 0;
}

#ifdef BIOSPARAM
/*
 * Function : int generic_NCR5380_biosparam(Disk * disk, kdev_t dev, int *ip)
 *
 * Purpose : Generates a BIOS / DOS compatible H-C-S mapping for 
 *	the specified device / size.
 * 
 * Inputs : size = size of device in sectors (512 bytes), dev = block device
 *	major / minor, ip[] = {heads, sectors, cylinders}  
 *
 * Returns : always 0 (success), initializes ip
 *	
 */

/* 
 * XXX Most SCSI boards use this mapping, I could be incorrect.  Some one
 * using hard disks on a trantor should verify that this mapping corresponds
 * to that used by the BIOS / ASPI driver by running the linux fdisk program
 * and matching the H_C_S coordinates to what DOS uses.
 */

int generic_NCR5380_biosparam(Disk * disk, kdev_t dev, int *ip)
{
  int size = disk->capacity;
  ip[0] = 64;
  ip[1] = 32;
  ip[2] = size >> 11;
  return 0;
}
#endif

#if NCR53C400_PSEUDO_DMA
static inline int NCR5380_pread (struct Scsi_Host *instance, unsigned char *dst,    int len)
{
    int blocks = len / 128;
    int start = 0;
    int i;
    int bl;
    NCR5380_local_declare();

    NCR5380_setup(instance);

#if (NDEBUG & NDEBUG_C400_PREAD)
    printk("53C400r: About to read %d blocks for %d bytes\n", blocks, len);
#endif

    NCR5380_write(C400_CONTROL_STATUS_REG, CSR_BASE | CSR_TRANS_DIR);
    NCR5380_write(C400_BLOCK_COUNTER_REG, blocks);
    while (1) {