fdomain.c

linux和2410结合开发 用他可以生成2410所需的zImage文件

/* fdomain.c -- Future Domain TMC-16x0 SCSI driver
 * Created: Sun May  3 18:53:19 1992 by [e-mail]
 * Revised: Mon Dec 28 21:59:02 1998 by [e-mail]
 * Author: Rickard E. Faith, [e-mail]
 * Copyright 1992-1996, 1998 Rickard E. Faith ([e-mail])
 * Shared IRQ supported added 7/7/2001  Alan Cox <[e-mail]>

 * 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.

 * You should have received a copy of the GNU General Public License along
 * with this program; if not, write to the Free Software Foundation, Inc.,
 * 675 Mass Ave, Cambridge, MA 02139, USA.

 **************************************************************************

 SUMMARY:

 Future Domain BIOS versions supported for autodetect:
    2.0, 3.0, 3.2, 3.4 (1.0), 3.5 (2.0), 3.6, 3.61
 Chips are supported:
    TMC-1800, TMC-18C50, TMC-18C30, TMC-36C70
 Boards supported:
    Future Domain TMC-1650, TMC-1660, TMC-1670, TMC-1680, TMC-1610M/MER/MEX
    Future Domain TMC-3260 (PCI)
    Quantum ISA-200S, ISA-250MG
    Adaptec AHA-2920A (PCI) [BUT *NOT* AHA-2920C -- use aic7xxx instead]
    IBM ?
 LILO/INSMOD command-line options:
    fdomain=<PORT_BASE>,<IRQ>[,<ADAPTER_ID>]


    
 NOTE:

 The Adaptec AHA-2920C has an Adaptec AIC-7850 chip on it.
 Use the aic7xxx driver for this board.
       
 The Adaptec AHA-2920A has a Future Domain chip on it, so this is the right
 driver for that card.  Unfortunately, the boxes will probably just say
 "2920", so you'll have to look on the card for a Future Domain logo, or a
 letter after the 2920.

 
 
 THANKS:

 Thanks to Adaptec for providing PCI boards for testing.  This finally
 enabled me to test the PCI detection and correct it for PCI boards that do
 not have a BIOS at a standard ISA location.  For PCI boards, LILO/INSMOD
 command-line options should no longer be needed.  --RF 18Nov98


 
 DESCRIPTION:
 
 This is the Linux low-level SCSI driver for Future Domain TMC-1660/1680
 TMC-1650/1670, and TMC-3260 SCSI host adapters.  The 1650 and 1670 have a
 25-pin external connector, whereas the 1660 and 1680 have a SCSI-2 50-pin
 high-density external connector.  The 1670 and 1680 have floppy disk
 controllers built in.  The TMC-3260 is a PCI bus card.

 Future Domain's older boards are based on the TMC-1800 chip, and this
 driver was originally written for a TMC-1680 board with the TMC-1800 chip.
 More recently, boards are being produced with the TMC-18C50 and TMC-18C30
 chips.  The latest and greatest board may not work with this driver.  If
 you have to patch this driver so that it will recognize your board's BIOS
 signature, then the driver may fail to function after the board is
 detected.

 Please note that the drive ordering that Future Domain implemented in BIOS
 versions 3.4 and 3.5 is the opposite of the order (currently) used by the
 rest of the SCSI industry.  If you have BIOS version 3.4 or 3.5, and have
 more then one drive, then the drive ordering will be the reverse of that
 which you see under DOS.  For example, under DOS SCSI ID 0 will be D: and
 SCSI ID 1 will be C: (the boot device).  Under Linux, SCSI ID 0 will be
 /dev/sda and SCSI ID 1 will be /dev/sdb.  The Linux ordering is consistent
 with that provided by all the other SCSI drivers for Linux.  If you want
 this changed, you will probably have to patch the higher level SCSI code.
 If you do so, please send me patches that are protected by #ifdefs.

 If you have a TMC-8xx or TMC-9xx board, then this is not the driver for
 your board.  Please refer to the Seagate driver for more information and
 possible support.

 
 
 HISTORY:

 Linux       Driver      Driver
 Version     Version     Date         Support/Notes

             0.0          3 May 1992  V2.0 BIOS; 1800 chip
 0.97        1.9         28 Jul 1992
 0.98.6      3.1         27 Nov 1992
 0.99        3.2          9 Dec 1992

 0.99.3      3.3         10 Jan 1993  V3.0 BIOS
 0.99.5      3.5         18 Feb 1993
 0.99.10     3.6         15 May 1993  V3.2 BIOS; 18C50 chip
 0.99.11     3.17         3 Jul 1993  (now under RCS)
 0.99.12     3.18        13 Aug 1993
 0.99.14     5.6         31 Oct 1993  (reselection code removed)

 0.99.15     5.9         23 Jan 1994  V3.4 BIOS (preliminary)
 1.0.8/1.1.1 5.15         1 Apr 1994  V3.4 BIOS; 18C30 chip (preliminary)
 1.0.9/1.1.3 5.16         7 Apr 1994  V3.4 BIOS; 18C30 chip
 1.1.38      5.18        30 Jul 1994  36C70 chip (PCI version of 18C30)
 1.1.62      5.20         2 Nov 1994  V3.5 BIOS
 1.1.73      5.22         7 Dec 1994  Quantum ISA-200S board; V2.0 BIOS

 1.1.82      5.26        14 Jan 1995  V3.5 BIOS; TMC-1610M/MER/MEX board
 1.2.10      5.28         5 Jun 1995  Quantum ISA-250MG board; V2.0, V2.01 BIOS
 1.3.4       5.31        23 Jun 1995  PCI BIOS-32 detection (preliminary)
 1.3.7       5.33         4 Jul 1995  PCI BIOS-32 detection
 1.3.28      5.36        17 Sep 1995  V3.61 BIOS; LILO command-line support
 1.3.34      5.39        12 Oct 1995  V3.60 BIOS; /proc
 1.3.72      5.39         8 Feb 1996  Adaptec AHA-2920 board
 1.3.85      5.41         4 Apr 1996
 2.0.12      5.44         8 Aug 1996  Use ID 7 for all PCI cards
 2.1.1       5.45         2 Oct 1996  Update ROM accesses for 2.1.x
 2.1.97      5.46	 23 Apr 1998  Rewritten PCI detection routines [mj]
 2.1.11x     5.47	  9 Aug 1998  Touched for 8 SCSI disk majors support
             5.48        18 Nov 1998  BIOS no longer needed for PCI detection
 2.2.0       5.50        28 Dec 1998  Support insmod parameters
 

 REFERENCES USED:

 "TMC-1800 SCSI Chip Specification (FDC-1800T)", Future Domain Corporation,
 1990.

 "Technical Reference Manual: 18C50 SCSI Host Adapter Chip", Future Domain
 Corporation, January 1992.

 "LXT SCSI Products: Specifications and OEM Technical Manual (Revision
 B/September 1991)", Maxtor Corporation, 1991.

 "7213S product Manual (Revision P3)", Maxtor Corporation, 1992.

 "Draft Proposed American National Standard: Small Computer System
 Interface - 2 (SCSI-2)", Global Engineering Documents. (X3T9.2/86-109,
 revision 10h, October 17, 1991)

 Private communications, Drew Eckhardt ([e-mail]) and Eric
 Youngdale ([e-mail]), 1992.

 Private communication, Tuong Le (Future Domain Engineering department),
 1994. (Disk geometry computations for Future Domain BIOS version 3.4, and
 TMC-18C30 detection.)

 Hogan, Thom. The Programmer's PC Sourcebook. Microsoft Press, 1988. Page
 60 (2.39: Disk Partition Table Layout).

 "18C30 Technical Reference Manual", Future Domain Corporation, 1993, page
 6-1.


 
 NOTES ON REFERENCES:

 The Maxtor manuals were free.  Maxtor telephone technical support is
 great!

 The Future Domain manuals were $25 and $35.  They document the chip, not
 the TMC-16x0 boards, so some information I had to guess at.  In 1992,
 Future Domain sold DOS BIOS source for $250 and the UN*X driver source was
 $750, but these required a non-disclosure agreement, so even if I could
 have afforded them, they would *not* have been useful for writing this
 publically distributable driver.  Future Domain technical support has
 provided some information on the phone and have sent a few useful FAXs.
 They have been much more helpful since they started to recognize that the
 word "Linux" refers to an operating system :-).

 

 ALPHA TESTERS:

 There are many other alpha testers that come and go as the driver
 develops.  The people listed here were most helpful in times of greatest
 need (mostly early on -- I've probably left out a few worthy people in
 more recent times):

 Todd Carrico ([e-mail]), Dan Poirier ([e-mail] ), Ken
 Corey ([e-mail]), C. de Bruin (bruin@[e-mail]), Sakari
 Aaltonen ([e-mail]), John Rice ([e-mail]), Brad
 Yearwood ([e-mail]), and Ray Toy ([e-mail]).

 Special thanks to Tien-Wan Yang ([e-mail]), who graciously lent me
 his 18C50-based card for debugging.  He is the sole reason that this
 driver works with the 18C50 chip.

 Thanks to Dave Newman ([e-mail]) for providing initial patches for
 the version 3.4 BIOS.

 Thanks to James T. McKinley ([e-mail]) for providing
 patches that support the TMC-3260, a PCI bus card with the 36C70 chip.
 The 36C70 chip appears to be "completely compatible" with the 18C30 chip.

 Thanks to Eric Kasten ([e-mail]) for providing the
 patch for the version 3.5 BIOS.

 Thanks for Stephen Henson ([e-mail]) for providing the
 patch for the Quantum ISA-200S SCSI adapter.
 
 Thanks to Adam Bowen for the signature to the 1610M/MER/MEX scsi cards, to
 Martin Andrews ([e-mail]) for the signature to some
 random TMC-1680 repackaged by IBM; and to Mintak Ng ([e-mail]) for
 the version 3.61 BIOS signature.

 Thanks for Mark Singer ([e-mail]) and Richard Simpson
 ([e-mail]) for more Quantum signatures and detective
 work on the Quantum RAM layout.

 Special thanks to James T. McKinley ([e-mail]) for
 providing patches for proper PCI BIOS32-mediated detection of the TMC-3260
 card (a PCI bus card with the 36C70 chip).  Please send James PCI-related
 bug reports.

 Thanks to Tom Cavin ([e-mail]) for preliminary command-line option
 patches.

 New PCI detection code written by Martin Mares <[e-mail]>

 Insmod parameter code based on patches from Daniel Graham
 <[e-mail]>. 
 
 All of the alpha testers deserve much thanks.



 NOTES ON USER DEFINABLE OPTIONS:

 DEBUG: This turns on the printing of various debug information.

 ENABLE_PARITY: This turns on SCSI parity checking.  With the current
 driver, all attached devices must support SCSI parity.  If none of your
 devices support parity, then you can probably get the driver to work by
 turning this option off.  I have no way of testing this, however, and it
 would appear that no one ever uses this option.

 FIFO_COUNT: The host adapter has an 8K cache (host adapters based on the
 18C30 chip have a 2k cache).  When this many 512 byte blocks are filled by
 the SCSI device, an interrupt will be raised.  Therefore, this could be as
 low as 0, or as high as 16.  Note, however, that values which are too high
 or too low seem to prevent any interrupts from occurring, and thereby lock
 up the machine.  I have found that 2 is a good number, but throughput may
 be increased by changing this value to values which are close to 2.
 Please let me know if you try any different values.

 DO_DETECT: This activates some old scan code which was needed before the
 high level drivers got fixed.  If you are having trouble with the driver,
 turning this on should not hurt, and might help.  Please let me know if
 this is the case, since this code will be removed from future drivers.

 RESELECTION: This is no longer an option, since I gave up trying to
 implement it in version 4.x of this driver.  It did not improve
 performance at all and made the driver unstable (because I never found one
 of the two race conditions which were introduced by the multiple
 outstanding command code).  The instability seems a very high price to pay
 just so that you don't have to wait for the tape to rewind.  If you want
 this feature implemented, send me patches.  I'll be happy to send a copy
 of my (broken) driver to anyone who would like to see a copy.

 **************************************************************************/

#include <linux/module.h>

#ifdef PCMCIA
#undef MODULE
#endif

#include <linux/init.h>
#include <linux/sched.h>
#include <asm/io.h>
#include <linux/blk.h>
#include "scsi.h"
#include "hosts.h"
#include "fdomain.h"
#include <asm/system.h>
#include <linux/spinlock.h>
#include <linux/errno.h>
#include <linux/string.h>
#include <linux/ioport.h>
#include <linux/proc_fs.h>
#include <linux/pci.h>
#include <linux/stat.h>
#include <linux/delay.h>

#include <linux/config.h>	/* for CONFIG_PCI */
  
#define VERSION          "$Revision: 5.50 $"

/* START OF USER DEFINABLE OPTIONS */

#define DEBUG            1	/* Enable debugging output */
#define ENABLE_PARITY    1	/* Enable SCSI Parity */
#define FIFO_COUNT       2	/* Number of 512 byte blocks before INTR */
#define DO_DETECT        0	/* Do device detection here (see scsi.c) */

/* END OF USER DEFINABLE OPTIONS */

#if DEBUG
#define EVERY_ACCESS     0	/* Write a line on every scsi access */
#define ERRORS_ONLY      1	/* Only write a line if there is an error */
#define DEBUG_DETECT     0	/* Debug fdomain_16x0_detect() */
#define DEBUG_MESSAGES   1	/* Debug MESSAGE IN phase */
#define DEBUG_ABORT      1	/* Debug abort() routine */
#define DEBUG_RESET      1	/* Debug reset() routine */
#define DEBUG_RACE       1      /* Debug interrupt-driven race condition */
#else
#define EVERY_ACCESS     0	/* LEAVE THESE ALONE--CHANGE THE ONES ABOVE */
#define ERRORS_ONLY      0
#define DEBUG_DETECT     0
#define DEBUG_MESSAGES   0
#define DEBUG_ABORT      0
#define DEBUG_RESET      0
#define DEBUG_RACE       0
#endif

/* Errors are reported on the line, so we don't need to report them again */
#if EVERY_ACCESS
#undef ERRORS_ONLY
#define ERRORS_ONLY      0
#endif

#if ENABLE_PARITY
#define PARITY_MASK      0x08
#else
#define PARITY_MASK      0x00
#endif

enum chip_type {
   unknown          = 0x00,
   tmc1800          = 0x01,
   tmc18c50         = 0x02,
   tmc18c30         = 0x03,
};

enum {
   in_arbitration   = 0x02,
   in_selection     = 0x04,
   in_other         = 0x08,
   disconnect       = 0x10,
   aborted          = 0x20,
   sent_ident       = 0x40,
};

enum in_port_type {
   Read_SCSI_Data   =  0,
   SCSI_Status      =  1,
   TMC_Status       =  2,
   FIFO_Status      =  3,	/* tmc18c50/tmc18c30 only */
   Interrupt_Cond   =  4,	/* tmc18c50/tmc18c30 only */
   LSB_ID_Code      =  5,
   MSB_ID_Code      =  6,
   Read_Loopback    =  7,
   SCSI_Data_NoACK  =  8,
   Interrupt_Status =  9,
   Configuration1   = 10,
   Configuration2   = 11,	/* tmc18c50/tmc18c30 only */
   Read_FIFO        = 12,
   FIFO_Data_Count  = 14
};

enum out_port_type {
   Write_SCSI_Data  =  0,
   SCSI_Cntl        =  1,
   Interrupt_Cntl   =  2,
   SCSI_Mode_Cntl   =  3,
   TMC_Cntl         =  4,
   Memory_Cntl      =  5,	/* tmc18c50/tmc18c30 only */
   Write_Loopback   =  7,
   IO_Control       = 11,	/* tmc18c30 only */
   Write_FIFO       = 12
};

static int               port_base         = 0;
static unsigned long     bios_base         = 0;
static int               bios_major        = 0;
static int               bios_minor        = 0;
static int               PCI_bus           = 0;
static int               Quantum           = 0;	/* Quantum board variant */
static int               interrupt_level   = 0;
static volatile int      in_command        = 0;
static Scsi_Cmnd         *current_SC       = NULL;
static enum chip_type    chip              = unknown;
static int               adapter_mask      = 0;
static int               this_id           = 0;
static int               setup_called      = 0;

#if DEBUG_RACE
static volatile int      in_interrupt_flag = 0;
#endif