tmscsim.c

Linux内核源代码 为压缩文件 是<<Linux内核>>一书中的源代码

/***********************************************************************
 *	FILE NAME : TMSCSIM.C					       *
 *	     BY   : C.L. Huang,  [e-mail]		       *
 *	Description: Device Driver for Tekram DC-390(T) PCI SCSI       *
 *		     Bus Master Host Adapter			       *
 * (C)Copyright 1995-1996 Tekram Technology Co., Ltd.		       *
 ***********************************************************************/
/* (C) Copyright: put under GNU GPL in 10/96  (see README.tmscsim)	*
*************************************************************************/
/* $Id: tmscsim.c,v 2.60.2.30 2000/12/20 01:07:12 garloff Exp $		*/
/*	Enhancements and bugfixes by					*
 *	Kurt Garloff <[e-mail]>	<[e-mail]>		*
 ***********************************************************************/
/*	HISTORY:							*
 *									*
 *	REV#	DATE	NAME	DESCRIPTION				*
 *	1.00  96/04/24	CLH	First release				*
 *	1.01  96/06/12	CLH	Fixed bug of Media Change for Removable *
 *				Device, scan all LUN. Support Pre2.0.10 *
 *	1.02  96/06/18	CLH	Fixed bug of Command timeout ...	*
 *	1.03  96/09/25	KG	Added tmscsim_proc_info()		*
 *	1.04  96/10/11	CLH	Updating for support KV 2.0.x		*
 *	1.05  96/10/18	KG	Fixed bug in DC390_abort(null ptr deref)*
 *	1.06  96/10/25	KG	Fixed module support			*
 *	1.07  96/11/09	KG	Fixed tmscsim_proc_info()		*
 *	1.08  96/11/18	KG	Fixed null ptr in DC390_Disconnect()	*
 *	1.09  96/11/30	KG	Added register the allocated IO space	*
 *	1.10  96/12/05	CLH	Modified tmscsim_proc_info(), and reset *
 *				pending interrupt in DC390_detect()	*
 *	1.11  97/02/05	KG/CLH	Fixeds problem with partitions greater	*
 *				than 1GB				*
 *	1.12  98/02/15  MJ      Rewritten PCI probing			*
 *	1.13  98/04/08	KG	Support for non DC390, __initfunc decls,*
 *				changed max devs from 10 to 16		*
 *	1.14a 98/05/05	KG	Dynamic DCB allocation, add-single-dev	*
 *				for LUNs if LUN_SCAN (BIOS) not set	*
 *				runtime config using /proc interface	*
 *	1.14b 98/05/06	KG	eliminated cli (); sti (); spinlocks	*
 *	1.14c 98/05/07	KG	2.0.x compatibility			*
 *	1.20a 98/05/07	KG	changed names of funcs to be consistent *
 *				DC390_ (entry points), dc390_ (internal)*
 *				reworked locking			*
 *	1.20b 98/05/12	KG	bugs: version, kfree, _ctmp		*
 *				debug output				*
 *	1.20c 98/05/12	KG	bugs: kfree, parsing, EEpromDefaults	*
 *	1.20d 98/05/14	KG	bugs: list linkage, clear flag after  	*
 *				reset on startup, code cleanup		*
 *	1.20e 98/05/15	KG	spinlock comments, name space cleanup	*
 *				pLastDCB now part of ACB structure	*
 *				added stats, timeout for 2.1, TagQ bug	*
 *				RESET and INQUIRY interface commands	*
 *	1.20f 98/05/18	KG	spinlocks fixes, max_lun fix, free DCBs	*
 *				for missing LUNs, pending int		*
 *	1.20g 98/05/19	KG	Clean up: Avoid short			*
 *	1.20h 98/05/21	KG	Remove AdaptSCSIID, max_lun ...		*
 *	1.20i 98/05/21	KG	Aiiie: Bug with TagQMask       		*
 *	1.20j 98/05/24	KG	Handle STAT_BUSY, handle pACB->pLinkDCB	*
 *				== 0 in remove_dev and DoingSRB_Done	*
 *	1.20k 98/05/25	KG	DMA_INT	(experimental)	       		*
 *	1.20l 98/05/27	KG	remove DMA_INT; DMA_IDLE cmds added;	*
 *	1.20m 98/06/10	KG	glitch configurable; made some global	*
 *				vars part of ACB; use DC390_readX	*
 *	1.20n 98/06/11	KG	startup params				*
 *	1.20o 98/06/15	KG	added TagMaxNum to boot/module params	*
 *				Device Nr -> Idx, TagMaxNum power of 2  *
 *	1.20p 98/06/17	KG	Docu updates. Reset depends on settings *
 *				pci_set_master added; 2.0.xx: pcibios_*	*
 *				used instead of MechNum things ...	*
 *	1.20q 98/06/23	KG	Changed defaults. Added debug code for	*
 *				removable media and fixed it. TagMaxNum	*
 *				fixed for DC390. Locking: ACB, DRV for	*
 *				better IRQ sharing. Spelling: Queueing	*
 *				Parsing and glitch_cfg changes. Display	*
 *				real SyncSpeed value. Made DisConn	*
 *				functional (!)				*
 *	1.20r 98/06/30	KG	Debug macros, allow disabling DsCn, set	*
 *				BIT4 in CtrlR4, EN_PAGE_INT, 2.0 module	*
 *				param -1 fixed.				*
 *	1.20s 98/08/20	KG	Debug info on abort(), try to check PCI,*
 *				phys_to_bus instead of phys_to_virt,	*
 *				fixed sel. process, fixed locking,	*
 *				added MODULE_XXX infos, changed IRQ	*
 *				request flags, disable DMA_INT		*
 *	1.20t 98/09/07	KG	TagQ report fixed; Write Erase DMA Stat;*
 *				initfunc -> __init; better abort;	*
 *				Timeout for XFER_DONE & BLAST_COMPLETE;	*
 *				Allow up to 33 commands being processed *
 *	2.0a  98/10/14	KG	Max Cmnds back to 17. DMA_Stat clearing *
 *				all flags. Clear within while() loops	*
 *				in DataIn_0/Out_0. Null ptr in dumpinfo	*
 *				for pSRB==0. Better locking during init.*
 *				bios_param() now respects part. table.	*
 *	2.0b  98/10/24	KG	Docu fixes. Timeout Msg in DMA Blast.	*
 *				Disallow illegal idx in INQUIRY/REMOVE	*
 *	2.0c  98/11/19	KG	Cleaned up detect/init for SMP boxes, 	*
 *				Write Erase DMA (1.20t) caused problems	*
 *	2.0d  98/12/25	KG	Christmas release ;-) Message handling  *
 *				completely reworked. Handle target ini-	*
 *				tiated SDTR correctly.			*
 *	2.0d1 99/01/25	KG	Try to handle RESTORE_PTR		*
 *	2.0d2 99/02/08	KG	Check for failure of kmalloc, correct 	*
 *				inclusion of scsicam.h, DelayReset	*
 *	2.0d3 99/05/31	KG	DRIVER_OK -> DID_OK, DID_NO_CONNECT,	*
 *				detect Target mode and warn.		*
 *				pcmd->result handling cleaned up.	*
 *	2.0d4 99/06/01	KG	Cleaned selection process. Found bug	*
 *				which prevented more than 16 tags. Now:	*
 *				24. SDTR cleanup. Cleaner multi-LUN	*
 *				handling. Don't modify ControlRegs/FIFO	*
 *				when connected.				*
 *	2.0d5 99/06/01	KG	Clear DevID, Fix INQUIRY after cfg chg.	*
 *	2.0d6 99/06/02	KG	Added ADD special command to allow cfg.	*
 *				before detection. Reset SYNC_NEGO_DONE	*
 *				after a bus reset.			*
 *	2.0d7 99/06/03	KG	Fixed bugs wrt add,remove commands	*
 *	2.0d8 99/06/04	KG	Removed copying of cmnd into CmdBlock.	*
 *				Fixed Oops in _release().		*
 *	2.0d9 99/06/06	KG	Also tag queue INQUIRY, T_U_R, ...	*
 *				Allow arb. no. of Tagged Cmnds. Max 32	*
 *	2.0d1099/06/20	KG	TagMaxNo changes now honoured! Queueing *
 *				clearified (renamed ..) TagMask handling*
 *				cleaned.				*
 *	2.0d1199/06/28	KG	cmd->result now identical to 2.0d2	*
 *	2.0d1299/07/04	KG	Changed order of processing in IRQ	*
 *	2.0d1399/07/05	KG	Don't update DCB fields if removed	*
 *	2.0d1499/07/05	KG	remove_dev: Move kfree() to the end	*
 *	2.0d1599/07/12	KG	use_new_eh_code: 0, ULONG -> UINT where	*
 *				appropriate				*
 *	2.0d1699/07/13	KG	Reenable StartSCSI interrupt, Retry msg	*
 *	2.0d1799/07/15	KG	Remove debug msg. Disable recfg. when	*
 *				there are queued cmnds			*
 *	2.0d1899/07/18	KG	Selection timeout: Don't requeue	*
 *	2.0d1999/07/18	KG	Abort: Only call scsi_done if dequeued	*
 *	2.0d2099/07/19	KG	Rst_Detect: DoingSRB_Done		*
 *	2.0d2199/08/15	KG	dev_id for request/free_irq, cmnd[0] for*
 *				RETRY, SRBdone does DID_ABORT for the 	*
 *				cmd passed by DC390_reset()		*
 *	2.0d2299/08/25	KG	dev_id fixed. can_queue: 42		*
 *	2.0d2399/08/25	KG	Removed some debugging code. dev_id 	*
 *				now is set to pACB. Use u8,u16,u32. 	*
 *	2.0d2499/11/14	KG	Unreg. I/O if failed IRQ alloc. Call	*
 * 				done () w/ DID_BAD_TARGET in case of	*
 *				missing DCB. We	are old EH!!		*
 *	2.0d2500/01/15	KG	2.3.3x compat from Andreas Schultz	*
 *				set unique_id. Disable RETRY message.	*
 *	2.0d2600/01/29	KG	Go to new EH.				*
 *	2.0d2700/01/31	KG	... but maintain 2.0 compat.		*
 *				and fix DCB freeing			*
 *	2.0d2800/02/14	KG	Queue statistics fixed, dump special cmd*
 *				Waiting_Timer for failed StartSCSI	*
 *				New EH: Don't return cmnds to ML on RST *
 *				Use old EH (don't have new EH fns yet)	*
 * 				Reset: Unlock, but refuse to queue	*
 * 				2.3 __setup function			*
 *	2.0e  00/05/22	KG	Return residual for 2.3			*
 *	2.0e1 00/05/25	KG	Compile fixes for 2.3.99		*
 *	2.0e2 00/05/27	KG	Jeff Garzik's pci_enable_device()	*
 *	2.0e3 00/09/29	KG	Some 2.4 changes. Don't try Sync Nego	*
 *				before INQUIRY has reported ability. 	*
 *				Recognise INQUIRY as scanning command.	*
 *	2.0e4 00/10/13	KG	Allow compilation into 2.4 kernel	*
 *	2.0e5 00/11/17	KG	Store Inq.flags in DCB			*
 *	2.0e6 00/11/22  KG	2.4 init function (Thx to O.Schumann)	*
 * 				2.4 PCI device table (Thx to A.Richter)	*
 *	2.0e7 00/11/28	KG	Allow overriding of BIOS settings	*
 *	2.0f  00/12/20	KG	Handle failed INQUIRYs during scan	*
 ***********************************************************************/

/* Uncomment SA_INTERRUPT, if the driver refuses to share its IRQ with other devices */
#define DC390_IRQ SA_SHIRQ /* | SA_INTERRUPT */

/* DEBUG options */
//#define DC390_DEBUG0
//#define DC390_DEBUG1
//#define DC390_DCBDEBUG
//#define DC390_PARSEDEBUG
//#define DC390_REMOVABLEDEBUG
//#define DC390_LOCKDEBUG

/* Debug definitions */
#ifdef DC390_DEBUG0
# define DEBUG0(x) x;
#else
# define DEBUG0(x)
#endif
#ifdef DC390_DEBUG1
# define DEBUG1(x) x;
#else
# define DEBUG1(x)
#endif
#ifdef DC390_DCBDEBUG
# define DCBDEBUG(x) x;
#else
# define DCBDEBUG(x)
#endif
#ifdef DC390_PARSEDEBUG
# define PARSEDEBUG(x) x;
#else
# define PARSEDEBUG(x)
#endif
#ifdef DC390_REMOVABLEDEBUG
# define REMOVABLEDEBUG(x) x;
#else
# define REMOVABLEDEBUG(x)
#endif
#define DCBDEBUG1(x)

/* Includes */
#ifdef MODULE
# include <linux/module.h>
#endif

#include <asm/dma.h>
#include <asm/io.h>
#include <asm/system.h>
#include <linux/delay.h>
#include <linux/signal.h>
#include <linux/sched.h>
#include <linux/errno.h>
#include <linux/kernel.h>
#include <linux/ioport.h>
#include <linux/pci.h>
#include <linux/proc_fs.h>
#include <linux/string.h>
#include <linux/ctype.h>
#include <linux/mm.h>
#include <linux/config.h>
#include <linux/version.h>
#include <linux/blk.h>
#include <linux/timer.h>

#include "scsi.h"
#include "hosts.h"
#include "constants.h"
#include "sd.h"
#include <linux/stat.h>
#include <scsi/scsicam.h>

#include "dc390.h"

#define PCI_DEVICE_ID_AMD53C974 	PCI_DEVICE_ID_AMD_SCSI

/* Locking */

/* Note: Starting from 2.1.9x, the mid-level scsi code issues a 
 * spinlock_irqsave (&io_request_lock) before calling the driver's 
 * routines, so we don't need to lock, except in the IRQ handler.
 * The policy 3, let the midlevel scsi code do the io_request_locks
 * and us locking on a driver specific lock, shouldn't hurt anybody; it
 * just causes a minor performance degradation for setting the locks.
 */

/* spinlock things
 * level 3: lock on both adapter specific locks and (global) io_request_lock
 * level 2: lock on adapter specific locks only
 * level 1: rely on the locking of the mid level code (io_request_lock)
 * undef  : traditional save_flags; cli; restore_flags;
 */

//#define DEBUG_SPINLOCKS 2	/* Set to 0, 1 or 2 in include/linux/spinlock.h */

#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,1,30)
# include <linux/init.h>
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,3,30)
# include <linux/spinlock.h>
#else
# include <asm/spinlock.h>
#endif
#endif


#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,1,93) 
# define USE_SPINLOCKS 1
# define NEW_PCI 1
#else
# undef NEW_PCI
# if LINUX_VERSION_CODE >= KERNEL_VERSION(2,1,30)
#  define USE_SPINLOCKS 2
# endif
#endif

#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,3,99)
static struct pci_device_id tmscsim_pci_tbl[] __initdata = {
	{
		vendor: PCI_VENDOR_ID_AMD,
		device: PCI_DEVICE_ID_AMD53C974,
		subvendor: PCI_ANY_ID,
		subdevice: PCI_ANY_ID,
	},
	{ }		/* Terminating entry */
};
MODULE_DEVICE_TABLE(pci, tmscsim_pci_tbl);
#endif
	
#ifdef USE_SPINLOCKS

# if USE_SPINLOCKS == 3 /* both */

#  if defined (CONFIG_SMP) || DEBUG_SPINLOCKS > 0
#   define DC390_LOCKA_INIT { spinlock_t __unlocked = SPIN_LOCK_UNLOCKED; pACB->lock = __unlocked; };
#  else
#   define DC390_LOCKA_INIT
#  endif
   spinlock_t dc390_drvlock = SPIN_LOCK_UNLOCKED;

#  define DC390_AFLAGS unsigned long aflags;
#  define DC390_IFLAGS unsigned long iflags;
#  define DC390_DFLAGS unsigned long dflags; 

#  define DC390_LOCK_IO spin_lock_irqsave (&io_request_lock, iflags)
#  define DC390_UNLOCK_IO spin_unlock_irqrestore (&io_request_lock, iflags)

#  define DC390_LOCK_DRV spin_lock_irqsave (&dc390_drvlock, dflags)
#  define DC390_UNLOCK_DRV spin_unlock_irqrestore (&dc390_drvlock, dflags)
#  define DC390_LOCK_DRV_NI spin_lock (&dc390_drvlock)
#  define DC390_UNLOCK_DRV_NI spin_unlock (&dc390_drvlock)

#  define DC390_LOCK_ACB spin_lock_irqsave (&(pACB->lock), aflags)
#  define DC390_UNLOCK_ACB spin_unlock_irqrestore (&(pACB->lock), aflags)
#  define DC390_LOCK_ACB_NI spin_lock (&(pACB->lock))
#  define DC390_UNLOCK_ACB_NI spin_unlock (&(pACB->lock))
//#  define DC390_LOCKA_INIT spin_lock_init (&(pACB->lock))

# else

#  if USE_SPINLOCKS == 2 /* adapter specific locks */

#   if defined (CONFIG_SMP) || DEBUG_SPINLOCKS > 0
#    define DC390_LOCKA_INIT { spinlock_t __unlocked = SPIN_LOCK_UNLOCKED; pACB->lock = __unlocked; };
#   else
#    define DC390_LOCKA_INIT
#   endif
    spinlock_t dc390_drvlock = SPIN_LOCK_UNLOCKED;
#   define DC390_AFLAGS unsigned long aflags;
#   define DC390_IFLAGS 
#  define DC390_DFLAGS unsigned long dflags; 
#   define DC390_LOCK_IO /* spin_lock_irqsave (&io_request_lock, iflags) */
#   define DC390_UNLOCK_IO /* spin_unlock_irqrestore (&io_request_lock, iflags) */
#   define DC390_LOCK_DRV spin_lock_irqsave (&dc390_drvlock, dflags)
#   define DC390_UNLOCK_DRV spin_unlock_irqrestore (&dc390_drvlock, dflags)
#   define DC390_LOCK_DRV_NI spin_lock (&dc390_drvlock)
#   define DC390_UNLOCK_DRV_NI spin_unlock (&dc390_drvlock)
#   define DC390_LOCK_ACB spin_lock_irqsave (&(pACB->lock), aflags)
#   define DC390_UNLOCK_ACB spin_unlock_irqrestore (&(pACB->lock), aflags)
#   define DC390_LOCK_ACB_NI spin_lock (&(pACB->lock))
#   define DC390_UNLOCK_ACB_NI spin_unlock (&(pACB->lock))
//#   define DC390_LOCKA_INIT spin_lock_init (&(pACB->lock))

#  else /* USE_SPINLOCKS == 1: global lock io_request_lock */

#   define DC390_AFLAGS 
#   define DC390_IFLAGS unsigned long iflags;
#   define DC390_DFLAGS unsigned long dflags; 
    spinlock_t dc390_drvlock = SPIN_LOCK_UNLOCKED;
#   define DC390_LOCK_IO spin_lock_irqsave (&io_request_lock, iflags)
#   define DC390_UNLOCK_IO spin_unlock_irqrestore (&io_request_lock, iflags)
#   define DC390_LOCK_DRV spin_lock_irqsave (&dc390_drvlock, dflags)
#   define DC390_UNLOCK_DRV spin_unlock_irqrestore (&dc390_drvlock, dflags)
#   define DC390_LOCK_DRV_NI spin_lock (&dc390_drvlock)
#   define DC390_UNLOCK_DRV_NI spin_unlock (&dc390_drvlock)
#   define DC390_LOCK_ACB /* DC390_LOCK_IO */
#   define DC390_UNLOCK_ACB /* DC390_UNLOCK_IO */
#   define DC390_LOCK_ACB_NI /* spin_lock (&(pACB->lock)) */
#   define DC390_UNLOCK_ACB_NI /* spin_unlock (&(pACB->lock)) */
#   define DC390_LOCKA_INIT /* DC390_LOCKA_INIT */

#  endif /* 2 */
# endif /* 3 */

#else /* USE_SPINLOCKS undefined */

# define DC390_AFLAGS unsigned long aflags;
# define DC390_IFLAGS unsigned long iflags;
# define DC390_DFLAGS unsigned long dflags; 
# define DC390_LOCK_IO save_flags (iflags); cli ()
# define DC390_UNLOCK_IO restore_flags (iflags)
# define DC390_LOCK_DRV save_flags (dflags); cli ()
# define DC390_UNLOCK_DRV restore_flags (dflags)
# define DC390_LOCK_DRV_NI
# define DC390_UNLOCK_DRV_NI
# define DC390_LOCK_ACB save_flags (aflags); cli ()
# define DC390_UNLOCK_ACB restore_flags (aflags)
# define DC390_LOCK_ACB_NI
# define DC390_UNLOCK_ACB_NI
# define DC390_LOCKA_INIT
#endif /* def */


/* These macros are used for uniform access to 2.0.x and 2.1.x PCI config space*/

#ifdef NEW_PCI
# define PDEV pdev
# define PDEVDECL struct pci_dev *pdev
# define PDEVDECL0 struct pci_dev *pdev = NULL
# define PDEVDECL1 struct pci_dev *pdev
# define PDEVSET pACB->pdev=pdev
# define PDEVSET1 pdev=pACB->pdev
# define PCI_WRITE_CONFIG_BYTE(pd, rv, bv) pci_write_config_byte (pd, rv, bv)
# define PCI_READ_CONFIG_BYTE(pd, rv, bv) pci_read_config_byte (pd, rv, bv)
# define PCI_WRITE_CONFIG_WORD(pd, rv, bv) pci_write_config_word (pd, rv, bv)
# define PCI_READ_CONFIG_WORD(pd, rv, bv) pci_read_config_word (pd, rv, bv)
# define PCI_BUS_DEV pdev->bus->number, pdev->devfn
# define PCI_PRESENT pci_present ()
# define PCI_SET_MASTER pci_set_master (pdev)
# define PCI_FIND_DEVICE(vend, id) (pdev = pci_find_device (vend, id, pdev))
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,3,10)
# define PCI_GET_IO_AND_IRQ io_port = pci_resource_start (pdev, 0); irq = pdev->irq
#else
# define PCI_GET_IO_AND_IRQ io_port = pdev->base_address[0] & PCI_BASE_ADDRESS_IO_MASK; irq = pdev->irq
#endif
#else
# include <linux/bios32.h>
# define PDEV pbus, pdevfn
# define PDEVDECL UCHAR pbus, UCHAR pdevfn
# define PDEVDECL0 UCHAR pbus = 0; UCHAR pdevfn = 0; USHORT pci_index = 0; int error
# define PDEVDECL1 UCHAR pbus; UCHAR pdevfn /*; USHORT pci_index */
# define PDEVSET pACB->pbus=pbus; pACB->pdevfn=pdevfn /*; pACB->pci_index=pci_index */
# define PDEVSET1 pbus=pACB->pbus; pdevfn=pACB->pdevfn /*; pci_index=pACB->pci_index */
# define PCI_WRITE_CONFIG_BYTE(pd, rv, bv) pcibios_write_config_byte (pd, rv, bv)
# define PCI_READ_CONFIG_BYTE(pd, rv, bv) pcibios_read_config_byte (pd, rv, bv)
# define PCI_WRITE_CONFIG_WORD(pd, rv, bv) pcibios_write_config_word (pd, rv, bv)
# define PCI_READ_CONFIG_WORD(pd, rv, bv) pcibios_read_config_word (pd, rv, bv)
# define PCI_BUS_DEV pbus, pdevfn
# define PCI_PRESENT pcibios_present ()
# define PCI_SET_MASTER dc390_set_master (pbus, pdevfn)
# define PCI_FIND_DEVICE(vend, id) (!pcibios_find_device (vend, id, pci_index++, &pbus, &pdevfn))
# define PCI_GET_IO_AND_IRQ error = pcibios_read_config_dword (pbus, pdevfn, PCI_BASE_ADDRESS_0, &io_port);	\
 error |= pcibios_read_config_byte (pbus, pdevfn, PCI_INTERRUPT_LINE, &irq);	\
 io_port &= 0xfffe;	\