tmscsim.c

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/************************************************************************
 *	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 Documentation/scsi/tmscsim.txt)	*
 ************************************************************************
 * $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	*
 *	2.1a  03/11/29  GL, KG	Initial fixing for 2.6. Convert to	*
 *				use the current PCI-mapping API, update	*
 *				command-queuing.			*
 *	2.1b  04/04/13  GL	Fix for 64-bit platforms		*
 *	2.1b1 04/01/31	GL	(applied 05.04) Remove internal		*
 *				command-queuing.			*
 *	2.1b2 04/02/01	CH	(applied 05.04) Fix error-handling	*
 *	2.1c  04/05/23  GL	Update to use the new pci_driver API,	*
 *				some scsi EH updates, more cleanup.	*
 *	2.1d  04/05/27	GL	Moved setting of scan_devices to	*
 *				slave_alloc/_configure/_destroy, as	*
 *				suggested by CH.			*
 ***********************************************************************/

/* 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

//#define NOP do{}while(0)
#define C_NOP

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

#include <linux/config.h>
#include <linux/module.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/mm.h>
#include <linux/blkdev.h>
#include <linux/timer.h>
#include <linux/interrupt.h>
#include <linux/init.h>
#include <linux/spinlock.h>
#include <asm/io.h>

#include <scsi/scsi.h>
#include <scsi/scsi_cmnd.h>
#include <scsi/scsi_device.h>
#include <scsi/scsi_host.h>
#include <scsi/scsicam.h>


#define DC390_BANNER "Tekram DC390/AM53C974"
#define DC390_VERSION "2.1d 2004-05-27"

#define PCI_DEVICE_ID_AMD53C974 	PCI_DEVICE_ID_AMD_SCSI


 static struct pci_device_id tmscsim_pci_tbl[] = {
	{
		.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);

#include "tmscsim.h"

static u8 dc390_StartSCSI( struct dc390_acb* pACB, struct dc390_dcb* pDCB, struct dc390_srb* pSRB );
static void dc390_DataOut_0( struct dc390_acb* pACB, struct dc390_srb* pSRB, u8 *psstatus);
static void dc390_DataIn_0( struct dc390_acb* pACB, struct dc390_srb* pSRB, u8 *psstatus);
static void dc390_Command_0( struct dc390_acb* pACB, struct dc390_srb* pSRB, u8 *psstatus);
static void dc390_Status_0( struct dc390_acb* pACB, struct dc390_srb* pSRB, u8 *psstatus);
static void dc390_MsgOut_0( struct dc390_acb* pACB, struct dc390_srb* pSRB, u8 *psstatus);
static void dc390_MsgIn_0( struct dc390_acb* pACB, struct dc390_srb* pSRB, u8 *psstatus);
static void dc390_DataOutPhase( struct dc390_acb* pACB, struct dc390_srb* pSRB, u8 *psstatus);
static void dc390_DataInPhase( struct dc390_acb* pACB, struct dc390_srb* pSRB, u8 *psstatus);
static void dc390_CommandPhase( struct dc390_acb* pACB, struct dc390_srb* pSRB, u8 *psstatus);
static void dc390_StatusPhase( struct dc390_acb* pACB, struct dc390_srb* pSRB, u8 *psstatus);
static void dc390_MsgOutPhase( struct dc390_acb* pACB, struct dc390_srb* pSRB, u8 *psstatus);
static void dc390_MsgInPhase( struct dc390_acb* pACB, struct dc390_srb* pSRB, u8 *psstatus);
static void dc390_Nop_0( struct dc390_acb* pACB, struct dc390_srb* pSRB, u8 *psstatus);
static void dc390_Nop_1( struct dc390_acb* pACB, struct dc390_srb* pSRB, u8 *psstatus);

static void dc390_SetXferRate( struct dc390_acb* pACB, struct dc390_dcb* pDCB );
static void dc390_Disconnect( struct dc390_acb* pACB );
static void dc390_Reselect( struct dc390_acb* pACB );
static void dc390_SRBdone( struct dc390_acb* pACB, struct dc390_dcb* pDCB, struct dc390_srb* pSRB );
static void dc390_DoingSRB_Done( struct dc390_acb* pACB, struct scsi_cmnd * cmd);
static void dc390_ScsiRstDetect( struct dc390_acb* pACB );
static void dc390_ResetSCSIBus( struct dc390_acb* pACB );
static void dc390_EnableMsgOut_Abort(struct dc390_acb*, struct dc390_srb*);
static irqreturn_t do_DC390_Interrupt( int, void *, struct pt_regs *);

static int    dc390_initAdapter(struct Scsi_Host *psh, unsigned long io_port, u8 Irq, u8 index );
static void   dc390_updateDCB (struct dc390_acb* pACB, struct dc390_dcb* pDCB);

static struct dc390_acb*	dc390_pACB_start= NULL;
static struct dc390_acb*	dc390_pACB_current = NULL;
static u32	dc390_laststatus = 0;
static u8	dc390_adapterCnt = 0;

/* Startup values, to be overriden on the commandline */
static int tmscsim[] = {-2, -2, -2, -2, -2, -2};
static int tmscsim_paramnum = ARRAY_SIZE(tmscsim);

module_param_array(tmscsim, int, tmscsim_paramnum, 0);
MODULE_PARM_DESC(tmscsim, "Host SCSI ID, Speed (0=10MHz), Device Flags, Adapter Flags, Max Tags (log2(tags)-1), DelayReset (s)");
MODULE_AUTHOR("C.L. Huang / Kurt Garloff");
MODULE_DESCRIPTION("SCSI host adapter driver for Tekram DC390 and other AMD53C974A based PCI SCSI adapters");
MODULE_LICENSE("GPL");
MODULE_SUPPORTED_DEVICE("sd,sr,sg,st");

static void *dc390_phase0[]={
       dc390_DataOut_0,
       dc390_DataIn_0,
       dc390_Command_0,
       dc390_Status_0,
       dc390_Nop_0,
       dc390_Nop_0,
       dc390_MsgOut_0,
       dc390_MsgIn_0,
       dc390_Nop_1
       };

static void *dc390_phase1[]={
       dc390_DataOutPhase,
       dc390_DataInPhase,
       dc390_CommandPhase,
       dc390_StatusPhase,
       dc390_Nop_0,
       dc390_Nop_0,
       dc390_MsgOutPhase,
       dc390_MsgInPhase,
       dc390_Nop_1
       };

#ifdef DC390_DEBUG1
static char* dc390_p0_str[] = {
       "dc390_DataOut_0",
       "dc390_DataIn_0",
       "dc390_Command_0",
       "dc390_Status_0",
       "dc390_Nop_0",
       "dc390_Nop_0",
       "dc390_MsgOut_0",
       "dc390_MsgIn_0",
       "dc390_Nop_1"
       };
     
static char* dc390_p1_str[] = {
       "dc390_DataOutPhase",
       "dc390_DataInPhase",
       "dc390_CommandPhase",
       "dc390_StatusPhase",
       "dc390_Nop_0",
       "dc390_Nop_0",
       "dc390_MsgOutPhase",
       "dc390_MsgInPhase",
       "dc390_Nop_1"
       };
#endif   

/* Devices erroneously pretending to be able to do TagQ */
static u8  dc390_baddevname1[2][28] ={
       "SEAGATE ST3390N         9546",
       "HP      C3323-300       4269"};
#define BADDEVCNT	2

static char*  dc390_adapname = "DC390";
static u8  dc390_eepromBuf[MAX_ADAPTER_NUM][EE_LEN];
static u8  dc390_clock_period1[] = {4, 5, 6, 7, 8, 10, 13, 20};
static u8  dc390_clock_speed[] = {100,80,67,57,50, 40, 31, 20};

/***********************************************************************
 * Functions for access to DC390 EEPROM
 * and some to emulate it
 *
 **********************************************************************/


static void __devinit dc390_EnDisableCE(u8 mode, struct pci_dev *pdev, u8 *regval)
{
    u8 bval;

    bval = 0;
    if(mode == ENABLE_CE)
	*regval = 0xc0;
    else
	*regval = 0x80;
    pci_write_config_byte(pdev, *regval, bval);
    if(mode == DISABLE_CE)
        pci_write_config_byte(pdev, *regval, bval);
    udelay(160);
}


/* Override EEprom values with explicitly set values */
static void __devinit dc390_EEprom_Override (u8 index)
{
    u8 *ptr = (u8 *) dc390_eepromBuf[index];
    u8 id;
    
    /* Adapter Settings */
    if (tmscsim[0] != -2)
	ptr[EE_ADAPT_SCSI_ID] = (u8)tmscsim[0];	/* Adapter ID */
    if (tmscsim[3] != -2)
	ptr[EE_MODE2] = (u8)tmscsim[3];