ncr53c406a.c

基于组件方式开发操作系统的OSKIT源代码

/* 
 *  NCR53c406.c
 *  Low-level SCSI driver for NCR53c406a chip.
 *  Copyright (C) 1994, 1995, 1996 Normunds Saumanis ([e-mail])
 * 
 *  LILO command line usage: ncr53c406a=<PORTBASE>[,<IRQ>[,<FASTPIO>]]
 *  Specify IRQ = 0 for non-interrupt driven mode.
 *  FASTPIO = 1 for fast pio mode, 0 for slow mode.
 *
 *  This program is free software; you can redistribute it and/or modify it
 *  under the terms of the GNU General Public License as published by the
 *  Free Software Foundation; either version 2, or (at your option) any
 *  later version.
 *
 *  This program is distributed in the hope that it will be useful, but
 *  WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 *  General Public License for more details.
 *
 */

#define NCR53C406A_DEBUG 0
#define VERBOSE_NCR53C406A_DEBUG 0

/* Set this to 1 for PIO mode (recommended) or to 0 for DMA mode */
#define USE_PIO 1

#define USE_BIOS 0
/* #define BIOS_ADDR 0xD8000 */ /* define this if autoprobe fails */
/* #define PORT_BASE 0x330 */   /* define this if autoprobe fails */
/* #define IRQ_LEV   0	*/      /* define this if autoprobe fails */
#define DMA_CHAN  5		/* this is ignored if DMA is disabled */

/* Set this to 0 if you encounter kernel lockups while transferring 
 * data in PIO mode */
#define USE_FAST_PIO 1

/* ============= End of user configurable parameters ============= */

#include <linux/module.h>

#include <linux/errno.h>
#include <linux/ioport.h>
#include <linux/sched.h>
#include <linux/interrupt.h>
#include <linux/proc_fs.h>
#include <linux/stat.h>
#include <linux/init.h>
#include <asm/io.h>
#include <asm/dma.h>
#include <asm/bitops.h>
#include <asm/irq.h>

#include <linux/blk.h>
#include <asm/spinlock.h>
#include "scsi.h"
#include "hosts.h"
#include "sd.h"

#include "NCR53c406a.h"

/* ============================================================= */

#define WATCHDOG 5000000

#define SYNC_MODE 0 		/* Synchronous transfer mode */

#if DEBUG
#undef NCR53C406A_DEBUG
#define NCR53C406A_DEBUG 1
#endif

#if USE_PIO
#define USE_DMA 0
#else
#define USE_DMA 1
#endif

/* Default configuration */
#define C1_IMG   0x07		/* ID=7 */
#define C2_IMG   0x48		/* FE SCSI2 */
#if USE_DMA
#define C3_IMG   0x21		/* CDB TE */
#else
#define C3_IMG   0x20		/* CDB */
#endif
#define C4_IMG   0x04		/* ANE */
#define C5_IMG   0xb6		/* AA PI SIE POL */

#define REG0 (outb(C4_IMG, CONFIG4))
#define REG1 (outb(C5_IMG, CONFIG5))

#if NCR53C406A_DEBUG
#define DEB(x) x
#else
#define DEB(x)
#endif

#if VERBOSE_NCR53C406A_DEBUG
#define VDEB(x) x
#else
#define VDEB(x)
#endif

#define LOAD_DMA_COUNT(count) \
  outb(count & 0xff, TC_LSB); \
  outb((count >> 8) & 0xff, TC_MSB); \
  outb((count >> 16) & 0xff, TC_HIGH);

/* Chip commands */
#define DMA_OP               0x80

#define SCSI_NOP             0x00
#define FLUSH_FIFO           0x01
#define CHIP_RESET           0x02
#define SCSI_RESET           0x03
#define RESELECT             0x40
#define SELECT_NO_ATN        0x41
#define SELECT_ATN           0x42
#define SELECT_ATN_STOP      0x43
#define ENABLE_SEL           0x44
#define DISABLE_SEL          0x45
#define SELECT_ATN3          0x46
#define RESELECT3            0x47
#define TRANSFER_INFO        0x10
#define INIT_CMD_COMPLETE    0x11
#define MSG_ACCEPT           0x12
#define TRANSFER_PAD         0x18
#define SET_ATN              0x1a
#define RESET_ATN            0x1b
#define SEND_MSG             0x20
#define SEND_STATUS          0x21
#define SEND_DATA            0x22
#define DISCONN_SEQ          0x23
#define TERMINATE_SEQ        0x24
#define TARG_CMD_COMPLETE    0x25
#define DISCONN              0x27
#define RECV_MSG             0x28
#define RECV_CMD             0x29
#define RECV_DATA            0x2a
#define RECV_CMD_SEQ         0x2b
#define TARGET_ABORT_DMA     0x04

/*----------------------------------------------------------------*/
/* 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 NCR53C406A_DEBUG
#define rtrc(i) {inb(0x3da);outb(0x31,0x3c0);outb((i),0x3c0);}
#else
#define rtrc(i) {}
#endif
/*----------------------------------------------------------------*/

enum Phase {
    idle,
    data_out,
    data_in,
    command_ph,
    status_ph,
    message_out,
    message_in
};

/* Static function prototypes */
static  void NCR53c406a_intr(int, void *, struct pt_regs *);
static  void do_NCR53c406a_intr(int, void *, struct pt_regs *);
static  void internal_done(Scsi_Cmnd *);
static  void wait_intr(void);
static  void chip_init(void);
static  void calc_port_addr(void);
#ifndef IRQ_LEV
static  int  irq_probe(void);
#endif

/* ================================================================= */

#if USE_BIOS
static void *bios_base = (void *)0;
#endif

#if PORT_BASE
static int   port_base = PORT_BASE;
#else
static int   port_base = 0;
#endif

#if IRQ_LEV
static int   irq_level = IRQ_LEV;
#else
static int   irq_level = -1; /* 0 is 'no irq', so use -1 for 'uninitialized'*/
#endif

#if USE_DMA
static int   dma_chan = 0;
#endif

#if USE_PIO
static int   fast_pio = USE_FAST_PIO;
#endif

static Scsi_Cmnd         *current_SC       = NULL;
static volatile int internal_done_flag = 0;
static volatile int internal_done_errcode = 0;
static char info_msg[256];

struct proc_dir_entry proc_scsi_NCR53c406a = {
    PROC_SCSI_NCR53C406A, 7, "NCR53c406a",
    S_IFDIR | S_IRUGO | S_IXUGO, 2
};
/* ================================================================= */

/* possible BIOS locations */
#if USE_BIOS
static void *addresses[] = {
    (void *)0xd8000,
    (void *)0xc8000
};
#define ADDRESS_COUNT (sizeof( addresses ) / sizeof( unsigned ))
#endif USE_BIOS
		       
/* possible i/o port addresses */
static unsigned short ports[] =
  { 0x230, 0x330, 0x280, 0x290, 0x330, 0x340, 0x300, 0x310, 0x348, 0x350 };
#define PORT_COUNT (sizeof( ports ) / sizeof( unsigned short ))

/* possible interrupt channels */
static unsigned short intrs[] = { 10, 11, 12, 15 };
#define INTR_COUNT (sizeof( intrs ) / sizeof( unsigned short ))

/* signatures for NCR 53c406a based controllers */
#if USE_BIOS
struct signature {
    char *signature;
    int  sig_offset;
    int  sig_length;
} signatures[] __initdata = {
    /*          1         2         3         4         5         6 */
    /* 123456789012345678901234567890123456789012345678901234567890 */
    { "Copyright (C) Acculogic, Inc.\r\n2.8M Diskette Extension Bios ver 4.04.03 03/01/1993", 61, 82 },
};
#define SIGNATURE_COUNT (sizeof( signatures ) / sizeof( struct signature ))
#endif USE_BIOS

/* ============================================================ */

/* Control Register Set 0 */
static int TC_LSB;		/* transfer counter lsb 	*/
static int TC_MSB;		/* transfer counter msb	*/
static int SCSI_FIFO;		/* scsi fifo register	*/
static int CMD_REG;		/* command register		*/
static int STAT_REG;		/* status register		*/
static int DEST_ID;		/* selection/reselection bus id */
static int INT_REG;		/* interrupt status register    */
static int SRTIMOUT;		/* select/reselect timeout reg  */
static int SEQ_REG;		/* sequence step register	*/
static int SYNCPRD;		/* synchronous transfer period  */
static int FIFO_FLAGS;		/* indicates # of bytes in fifo */
static int SYNCOFF;		/* synchronous offset register  */
static int CONFIG1;		/* configuration register	*/
static int CLKCONV;		/* clock conversion reg	*/
/*static int TESTREG;*/		/* test mode register		*/
static int CONFIG2;		/* Configuration 2 Register     */
static int CONFIG3;		/* Configuration 3 Register	*/
static int CONFIG4;		/* Configuration 4 Register     */
static int TC_HIGH;		/* Transfer Counter High */
/*static int FIFO_BOTTOM;*/	/* Reserve FIFO byte register   */

/* Control Register Set 1 */
/*static int JUMPER_SENSE;*/	/* Jumper sense port reg (r/w) */
/*static int SRAM_PTR;*/	/* SRAM address pointer reg (r/w) */
/*static int SRAM_DATA;*/	/* SRAM data register (r/w) */
static int PIO_FIFO;		/* PIO FIFO registers (r/w) */
/*static int PIO_FIFO1;*/	/*  */
/*static int PIO_FIFO2;*/	/*  */
/*static int PIO_FIFO3;*/	/*  */
static int PIO_STATUS;		/* PIO status (r/w) */
/*static int ATA_CMD;*/		/* ATA command/status reg (r/w) */
/*static int ATA_ERR;*/		/* ATA features/error register (r/w)*/
static int PIO_FLAG;		/* PIO flag interrupt enable (r/w) */
static int CONFIG5;		/* Configuration 5 register (r/w) */
/*static int SIGNATURE;*/	/* Signature Register (r) */
/*static int CONFIG6;*/		/* Configuration 6 register (r) */

/* ============================================================== */

#if USE_DMA
static __inline__ int 
NCR53c406a_dma_setup (unsigned char *ptr, 
		      unsigned int count, 
		      unsigned char mode) {
    unsigned limit;
    unsigned long flags = 0;
    
    VDEB(printk("dma: before count=%d   ", count));
    if (dma_chan <=3) {
        if (count > 65536)
            count = 65536;
        limit = 65536 - (((unsigned) ptr) & 0xFFFF);
    } else {
        if (count > (65536<<1)) 
            count = (65536<<1);
        limit = (65536<<1) - (((unsigned) ptr) & 0x1FFFF);
    }
    
    if (count > limit) count = limit;
    
    VDEB(printk("after count=%d\n", count));
    if ((count & 1) || (((unsigned) ptr) & 1))
        panic ("NCR53c406a: attempted unaligned DMA transfer\n"); 
    
    flags=claim_dma_lock();
    disable_dma(dma_chan);
    clear_dma_ff(dma_chan);
    set_dma_addr(dma_chan, (long) ptr);
    set_dma_count(dma_chan, count);
    set_dma_mode(dma_chan, mode);
    enable_dma(dma_chan);
    release_dma_lock(flags);    
    
    return count;
}

static __inline__ int 
NCR53c406a_dma_write(unsigned char *src, unsigned int count) {
    return NCR53c406a_dma_setup (src, count, DMA_MODE_WRITE);
}

static __inline__ int 
NCR53c406a_dma_read(unsigned char *src, unsigned int count) {
    return NCR53c406a_dma_setup (src, count, DMA_MODE_READ);
}

static __inline__ int 
NCR53c406a_dma_residual (void) {
    register int tmp;
    unsigned long flags;

    flags=claim_dma_lock();
    clear_dma_ff(dma_chan);
    tmp = get_dma_residue(dma_chan);
    release_dma_lock(flags);
    
    return tmp;
}
#endif USE_DMA

#if USE_PIO
static __inline__ int NCR53c406a_pio_read(unsigned char *request, 
					  unsigned int reqlen) 
{
    int	i;
    int	len;	/* current scsi fifo size */
    unsigned long flags = 0;
    
    REG1;