[linux-2.6-block.git] / drivers / scsi / dtc.c


#define PSEUDO_DMA
#define DONT_USE_INTR
#define UNSAFE			/* Leave interrupts enabled during pseudo-dma I/O */
#define DMA_WORKS_RIGHT


/*
 * DTC 3180/3280 driver, by
 *	Ray Van Tassle	rayvt@comm.mot.com
 *
 *	taken from ...
 *	Trantor T128/T128F/T228 driver by...
 *
 * 	Drew Eckhardt
 *	Visionary Computing
 *	(Unix and Linux consulting and custom programming)
 *	drew@colorado.edu
 *      +1 (303) 440-4894
 *
 * DISTRIBUTION RELEASE 1.
 */

/*
 * The card is detected and initialized in one of several ways : 
 * 1.  Autoprobe (default) - since the board is memory mapped, 
 *     a BIOS signature is scanned for to locate the registers.
 *     An interrupt is triggered to autoprobe for the interrupt
 *     line.
 *
 * 2.  With command line overrides - dtc=address,irq may be 
 *     used on the LILO command line to override the defaults.
 * 
*/

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


#include <linux/module.h>
#include <linux/signal.h>
#include <linux/blkdev.h>
#include <linux/delay.h>
#include <linux/stat.h>
#include <linux/string.h>
#include <linux/init.h>
#include <linux/interrupt.h>
#include <linux/io.h>
#include "scsi.h"
#include <scsi/scsi_host.h>
#include "dtc.h"
#define AUTOPROBE_IRQ
#include "NCR5380.h"


#define DTC_PUBLIC_RELEASE 2

/*
 * The DTC3180 & 3280 boards are memory mapped.
 * 
 */

/*
 */
/* Offset from DTC_5380_OFFSET */
#define DTC_CONTROL_REG		0x100	/* rw */
#define D_CR_ACCESS		0x80	/* ro set=can access 3280 registers */
#define CSR_DIR_READ		0x40	/* rw direction, 1 = read 0 = write */

#define CSR_RESET              0x80	/* wo  Resets 53c400 */
#define CSR_5380_REG           0x80	/* ro  5380 registers can be accessed */
#define CSR_TRANS_DIR          0x40	/* rw  Data transfer direction */
#define CSR_SCSI_BUFF_INTR     0x20	/* rw  Enable int on transfer ready */
#define CSR_5380_INTR          0x10	/* rw  Enable 5380 interrupts */
#define CSR_SHARED_INTR        0x08	/* rw  Interrupt sharing */
#define CSR_HOST_BUF_NOT_RDY   0x04	/* ro  Host buffer not ready */
#define CSR_SCSI_BUF_RDY       0x02	/* ro  SCSI buffer ready */
#define CSR_GATED_5380_IRQ     0x01	/* ro  Last block xferred */
#define CSR_INT_BASE (CSR_SCSI_BUFF_INTR | CSR_5380_INTR)


#define DTC_BLK_CNT		0x101	/* rw 
					 * # of 128-byte blocks to transfer */


#define D_CR_ACCESS             0x80	/* ro set=can access 3280 registers */

#define DTC_SWITCH_REG		0x3982	/* ro - DIP switches */
#define DTC_RESUME_XFER		0x3982	/* wo - resume data xfer 
					 * after disconnect/reconnect*/

#define DTC_5380_OFFSET		0x3880	/* 8 registers here, see NCR5380.h */

/*!!!! for dtc, it's a 128 byte buffer at 3900 !!! */
#define DTC_DATA_BUF		0x3900	/* rw 128 bytes long */

static struct override {
	unsigned int address;
	int irq;
} overrides
#ifdef OVERRIDE
[] __initdata = OVERRIDE;
#else
[4] __initdata = {
	{ 0, IRQ_AUTO }, { 0, IRQ_AUTO }, { 0, IRQ_AUTO }, { 0, IRQ_AUTO }
};
#endif

#define NO_OVERRIDES ARRAY_SIZE(overrides)

static struct base {
	unsigned long address;
	int noauto;
} bases[] __initdata = {
	{ 0xcc000, 0 },
	{ 0xc8000, 0 },
	{ 0xdc000, 0 },
	{ 0xd8000, 0 }
};

#define NO_BASES ARRAY_SIZE(bases)

static const struct signature {
	const char *string;
	int offset;
} signatures[] = {
	{"DATA TECHNOLOGY CORPORATION BIOS", 0x25},
};

#define NO_SIGNATURES ARRAY_SIZE(signatures)

#ifndef MODULE
/*
 * Function : dtc_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.
 *
 */

static int __init dtc_setup(char *str)
{
	static int commandline_current = 0;
	int i;
	int ints[10];

	get_options(str, ARRAY_SIZE(ints), ints);
	if (ints[0] != 2)
		printk("dtc_setup: usage dtc=address,irq\n");
	else if (commandline_current < NO_OVERRIDES) {
		overrides[commandline_current].address = ints[1];
		overrides[commandline_current].irq = ints[2];
		for (i = 0; i < NO_BASES; ++i)
			if (bases[i].address == ints[1]) {
				bases[i].noauto = 1;
				break;
			}
		++commandline_current;
	}
	return 1;
}

__setup("dtc=", dtc_setup);
#endif

/* 
 * Function : int dtc_detect(struct scsi_host_template * tpnt)
 *
 * Purpose : detects and initializes DTC 3180/3280 controllers
 *	that were autoprobed, overridden on the LILO command line, 
 *	or specified at compile time.
 *
 * Inputs : tpnt - template for this SCSI adapter.
 * 
 * Returns : 1 if a host adapter was found, 0 if not.
 *
*/

static int __init dtc_detect(struct scsi_host_template * tpnt)
{
	static int current_override = 0, current_base = 0;
	struct Scsi_Host *instance;
	unsigned int addr;
	void __iomem *base;
	int sig, count;

	for (count = 0; current_override < NO_OVERRIDES; ++current_override) {
		addr = 0;
		base = NULL;

		if (overrides[current_override].address) {
			addr = overrides[current_override].address;
			base = ioremap(addr, 0x2000);
			if (!base)
				addr = 0;
		} else
			for (; !addr && (current_base < NO_BASES); ++current_base) {
#if (DTCDEBUG & DTCDEBUG_INIT)
				printk(KERN_DEBUG "scsi-dtc : probing address %08x\n", bases[current_base].address);
#endif
				if (bases[current_base].noauto)
					continue;
				base = ioremap(bases[current_base].address, 0x2000);
				if (!base)
					continue;
				for (sig = 0; sig < NO_SIGNATURES; ++sig) {
					if (check_signature(base + signatures[sig].offset, signatures[sig].string, strlen(signatures[sig].string))) {
						addr = bases[current_base].address;
#if (DTCDEBUG & DTCDEBUG_INIT)
						printk(KERN_DEBUG "scsi-dtc : detected board.\n");
#endif
						goto found;
					}
				}
				iounmap(base);
			}

#if defined(DTCDEBUG) && (DTCDEBUG & DTCDEBUG_INIT)
		printk(KERN_DEBUG "scsi-dtc : base = %08x\n", addr);
#endif

		if (!addr)
			break;

found:
		instance = scsi_register(tpnt, sizeof(struct NCR5380_hostdata));
		if (instance == NULL)
			break;

		instance->base = addr;
		((struct NCR5380_hostdata *)(instance)->hostdata)->base = base;

		NCR5380_init(instance, 0);

		NCR5380_write(DTC_CONTROL_REG, CSR_5380_INTR);	/* Enable int's */
		if (overrides[current_override].irq != IRQ_AUTO)
			instance->irq = overrides[current_override].irq;
		else
			instance->irq = NCR5380_probe_irq(instance, DTC_IRQS);

		/* Compatibility with documented NCR5380 kernel parameters */
		if (instance->irq == 255)
			instance->irq = NO_IRQ;

#ifndef DONT_USE_INTR
		/* With interrupts enabled, it will sometimes hang when doing heavy
		 * reads. So better not enable them until I finger it out. */
		if (instance->irq != NO_IRQ)
			if (request_irq(instance->irq, dtc_intr, 0,
					"dtc", instance)) {
				printk(KERN_ERR "scsi%d : IRQ%d not free, interrupts disabled\n", instance->host_no, instance->irq);
				instance->irq = NO_IRQ;
			}

		if (instance->irq == NO_IRQ) {
			printk(KERN_WARNING "scsi%d : interrupts not enabled. for better interactive performance,\n", instance->host_no);
			printk(KERN_WARNING "scsi%d : please jumper the board for a free IRQ.\n", instance->host_no);
		}
#else
		if (instance->irq != NO_IRQ)
			printk(KERN_WARNING "scsi%d : interrupts not used. Might as well not jumper it.\n", instance->host_no);
		instance->irq = NO_IRQ;
#endif
#if defined(DTCDEBUG) && (DTCDEBUG & DTCDEBUG_INIT)
		printk("scsi%d : irq = %d\n", instance->host_no, instance->irq);
#endif

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

/*
 * Function : int dtc_biosparam(Disk * disk, struct block_device *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.
*/

static int dtc_biosparam(struct scsi_device *sdev, struct block_device *dev,
			 sector_t capacity, int *ip)
{
	int size = capacity;

	ip[0] = 64;
	ip[1] = 32;
	ip[2] = size >> 11;
	return 0;
}


/****************************************************************
 * Function : int NCR5380_pread (struct Scsi_Host *instance, 
 *	unsigned char *dst, int len)
 *
 * Purpose : Fast 5380 pseudo-dma read function, reads len bytes to 
 *	dst
 * 
 * Inputs : dst = destination, len = length in bytes
 *
 * Returns : 0 on success, non zero on a failure such as a watchdog 
 * 	timeout.
*/

static inline int NCR5380_pread(struct Scsi_Host *instance, unsigned char *dst, int len)
{
	unsigned char *d = dst;
	int i;			/* For counting time spent in the poll-loop */
	struct NCR5380_hostdata *hostdata = shost_priv(instance);
	NCR5380_local_declare();
	NCR5380_setup(instance);

	i = 0;
	NCR5380_read(RESET_PARITY_INTERRUPT_REG);
	NCR5380_write(MODE_REG, MR_ENABLE_EOP_INTR | MR_DMA_MODE);
	if (instance->irq == NO_IRQ)
		NCR5380_write(DTC_CONTROL_REG, CSR_DIR_READ);
	else
		NCR5380_write(DTC_CONTROL_REG, CSR_DIR_READ | CSR_INT_BASE);
	NCR5380_write(DTC_BLK_CNT, len >> 7);	/* Block count */
	rtrc(1);
	while (len > 0) {
		rtrc(2);
		while (NCR5380_read(DTC_CONTROL_REG) & CSR_HOST_BUF_NOT_RDY)
			++i;
		rtrc(3);
		memcpy_fromio(d, base + DTC_DATA_BUF, 128);
		d += 128;
		len -= 128;
		rtrc(7);
		/*** with int's on, it sometimes hangs after here.
		 * Looks like something makes HBNR go away. */
	}
	rtrc(4);
	while (!(NCR5380_read(DTC_CONTROL_REG) & D_CR_ACCESS))
		++i;
	NCR5380_write(MODE_REG, 0);	/* Clear the operating mode */
	rtrc(0);
	NCR5380_read(RESET_PARITY_INTERRUPT_REG);
	if (i > hostdata->spin_max_r)
		hostdata->spin_max_r = i;
	return (0);
}

/****************************************************************
 * Function : int NCR5380_pwrite (struct Scsi_Host *instance, 
 *	unsigned char *src, int len)
 *
 * Purpose : Fast 5380 pseudo-dma write function, transfers len bytes from
 *	src
 * 
 * Inputs : src = source, len = length in bytes
 *
 * Returns : 0 on success, non zero on a failure such as a watchdog 
 * 	timeout.
*/

static inline int NCR5380_pwrite(struct Scsi_Host *instance, unsigned char *src, int len)
{
	int i;
	struct NCR5380_hostdata *hostdata = shost_priv(instance);
	NCR5380_local_declare();
	NCR5380_setup(instance);

	NCR5380_read(RESET_PARITY_INTERRUPT_REG);
	NCR5380_write(MODE_REG, MR_ENABLE_EOP_INTR | MR_DMA_MODE);
	/* set direction (write) */
	if (instance->irq == NO_IRQ)
		NCR5380_write(DTC_CONTROL_REG, 0);
	else
		NCR5380_write(DTC_CONTROL_REG, CSR_5380_INTR);
	NCR5380_write(DTC_BLK_CNT, len >> 7);	/* Block count */
	for (i = 0; len > 0; ++i) {
		rtrc(5);
		/* Poll until the host buffer can accept data. */
		while (NCR5380_read(DTC_CONTROL_REG) & CSR_HOST_BUF_NOT_RDY)
			++i;
		rtrc(3);
		memcpy_toio(base + DTC_DATA_BUF, src, 128);
		src += 128;
		len -= 128;
	}
	rtrc(4);
	while (!(NCR5380_read(DTC_CONTROL_REG) & D_CR_ACCESS))
		++i;
	rtrc(6);
	/* Wait until the last byte has been sent to the disk */
	while (!(NCR5380_read(TARGET_COMMAND_REG) & TCR_LAST_BYTE_SENT))
		++i;
	rtrc(7);
	/* Check for parity error here. fixme. */
	NCR5380_write(MODE_REG, 0);	/* Clear the operating mode */
	rtrc(0);
	if (i > hostdata->spin_max_w)
		hostdata->spin_max_w = i;
	return (0);
}

MODULE_LICENSE("GPL");

#include "NCR5380.c"

static int dtc_release(struct Scsi_Host *shost)
{
	NCR5380_local_declare();
	NCR5380_setup(shost);
	if (shost->irq != NO_IRQ)
		free_irq(shost->irq, shost);
	NCR5380_exit(shost);
	if (shost->io_port && shost->n_io_port)
		release_region(shost->io_port, shost->n_io_port);
	scsi_unregister(shost);
	iounmap(base);
	return 0;
}

static struct scsi_host_template driver_template = {
	.name				= "DTC 3180/3280 ",
	.detect				= dtc_detect,
	.release			= dtc_release,
	.proc_name			= "dtc3x80",
	.show_info			= dtc_show_info,
	.write_info			= dtc_write_info,
	.info				= dtc_info,
	.queuecommand			= dtc_queue_command,
	.eh_abort_handler		= dtc_abort,
	.eh_bus_reset_handler		= dtc_bus_reset,
	.bios_param     		= dtc_biosparam,
	.can_queue      		= CAN_QUEUE,
	.this_id        		= 7,
	.sg_tablesize   		= SG_ALL,
	.cmd_per_lun    		= CMD_PER_LUN,
	.use_clustering 		= DISABLE_CLUSTERING,
};
#include "scsi_module.c"
Commit	Line	Data
1da177e4	1
1da177e4 LT	2	#define PSEUDO_DMA
	3	#define DONT_USE_INTR
	4	#define UNSAFE /* Leave interrupts enabled during pseudo-dma I/O */
1da177e4 LT	5	#define DMA_WORKS_RIGHT
	6
	7
	8	/*
	9	* DTC 3180/3280 driver, by
	10	* Ray Van Tassle rayvt@comm.mot.com
	11	*
	12	* taken from ...
	13	* Trantor T128/T128F/T228 driver by...
	14	*
	15	* Drew Eckhardt
	16	* Visionary Computing
	17	* (Unix and Linux consulting and custom programming)
	18	* drew@colorado.edu
	19	* +1 (303) 440-4894
	20	*
	21	* DISTRIBUTION RELEASE 1.
3f9e986e	22	*/
1da177e4 LT	23
1da177e4 LT	24	/*
1da177e4 LT	25	* The card is detected and initialized in one of several ways :
	26	* 1. Autoprobe (default) - since the board is memory mapped,
	27	* a BIOS signature is scanned for to locate the registers.
	28	* An interrupt is triggered to autoprobe for the interrupt
	29	* line.
	30	*
	31	* 2. With command line overrides - dtc=address,irq may be
	32	* used on the LILO command line to override the defaults.
	33	*
	34	*/
	35
	36	/----------------------------------------------------------------/
	37	/* the following will set the monitor border color (useful to find
	38	where something crashed or gets stuck at */
	39	/* 1 = blue
	40	2 = green
	41	3 = cyan
	42	4 = red
	43	5 = magenta
	44	6 = yellow
	45	7 = white
	46	*/
	47	#if 0
	48	#define rtrc(i) {inb(0x3da); outb(0x31, 0x3c0); outb((i), 0x3c0);}
	49	#else
	50	#define rtrc(i) {}
	51	#endif
	52
	53
1da177e4 LT	54	#include <linux/module.h>
1da177e4 LT	55	#include <linux/signal.h>
1da177e4 LT	56	#include <linux/blkdev.h>
	57	#include <linux/delay.h>
	58	#include <linux/stat.h>
	59	#include <linux/string.h>
	60	#include <linux/init.h>
	61	#include <linux/interrupt.h>
53d5ed62	62	#include <linux/io.h>
1da177e4 LT	63	#include "scsi.h"
	64	#include <scsi/scsi_host.h>
	65	#include "dtc.h"
	66	#define AUTOPROBE_IRQ
	67	#include "NCR5380.h"
	68
	69
	70	#define DTC_PUBLIC_RELEASE 2
	71
1da177e4 LT	72	/*
	73	* The DTC3180 & 3280 boards are memory mapped.
	74	*
	75	*/
	76
	77	/*
	78	*/
	79	/* Offset from DTC_5380_OFFSET */
	80	#define DTC_CONTROL_REG 0x100 /* rw */
	81	#define D_CR_ACCESS 0x80 /* ro set=can access 3280 registers */
	82	#define CSR_DIR_READ 0x40 /* rw direction, 1 = read 0 = write */
	83
	84	#define CSR_RESET 0x80 /* wo Resets 53c400 */
	85	#define CSR_5380_REG 0x80 /* ro 5380 registers can be accessed */
	86	#define CSR_TRANS_DIR 0x40 /* rw Data transfer direction */
	87	#define CSR_SCSI_BUFF_INTR 0x20 /* rw Enable int on transfer ready */
	88	#define CSR_5380_INTR 0x10 /* rw Enable 5380 interrupts */
	89	#define CSR_SHARED_INTR 0x08 /* rw Interrupt sharing */
	90	#define CSR_HOST_BUF_NOT_RDY 0x04 /* ro Host buffer not ready */
	91	#define CSR_SCSI_BUF_RDY 0x02 /* ro SCSI buffer ready */
	92	#define CSR_GATED_5380_IRQ 0x01 /* ro Last block xferred */
	93	#define CSR_INT_BASE (CSR_SCSI_BUFF_INTR \| CSR_5380_INTR)
	94
	95
	96	#define DTC_BLK_CNT 0x101 /* rw
	97	* # of 128-byte blocks to transfer */
	98
	99
	100	#define D_CR_ACCESS 0x80 /* ro set=can access 3280 registers */
	101
	102	#define DTC_SWITCH_REG 0x3982 /* ro - DIP switches */
	103	#define DTC_RESUME_XFER 0x3982 /* wo - resume data xfer
	104	* after disconnect/reconnect*/
	105
	106	#define DTC_5380_OFFSET 0x3880 /* 8 registers here, see NCR5380.h */
	107
	108	/!!!! for dtc, it's a 128 byte buffer at 3900 !!! /
	109	#define DTC_DATA_BUF 0x3900 /* rw 128 bytes long */
	110
	111	static struct override {
	112	unsigned int address;
	113	int irq;
	114	} overrides
	115	#ifdef OVERRIDE
	116	[] __initdata = OVERRIDE;
	117	#else
1fbe8529 AC	118	[4] __initdata = {
	119	{ 0, IRQ_AUTO }, { 0, IRQ_AUTO }, { 0, IRQ_AUTO }, { 0, IRQ_AUTO }
	120	};
1da177e4 LT	121	#endif
1da177e4 LT	122
6391a113	123	#define NO_OVERRIDES ARRAY_SIZE(overrides)
1da177e4 LT	124
	125	static struct base {
	126	unsigned long address;
	127	int noauto;
6391a113 TK	128	} bases[] __initdata = {
	129	{ 0xcc000, 0 },
	130	{ 0xc8000, 0 },
	131	{ 0xdc000, 0 },
1da177e4 LT	132	{ 0xd8000, 0 }
	133	};
	134
6391a113	135	#define NO_BASES ARRAY_SIZE(bases)
1da177e4 LT	136
	137	static const struct signature {
	138	const char *string;
	139	int offset;
6391a113	140	} signatures[] = {
1da177e4 LT	141	{"DATA TECHNOLOGY CORPORATION BIOS", 0x25},
	142	};
	143
6391a113	144	#define NO_SIGNATURES ARRAY_SIZE(signatures)
1da177e4 LT	145
	146	#ifndef MODULE
	147	/*
	148	* Function : dtc_setup(char str, int ints)
	149	*
	150	* Purpose : LILO command line initialization of the overrides array,
6391a113	151	*
1da177e4 LT	152	* Inputs : str - unused, ints - array of integer parameters with ints[0]
	153	* equal to the number of ints.
	154	*
1fbe8529	155	*/
1da177e4	156
925e4610	157	static int __init dtc_setup(char *str)
1da177e4 LT	158	{
	159	static int commandline_current = 0;
	160	int i;
925e4610 FT	161	int ints[10];
	162
	163	get_options(str, ARRAY_SIZE(ints), ints);
1da177e4 LT	164	if (ints[0] != 2)
	165	printk("dtc_setup: usage dtc=address,irq\n");
	166	else if (commandline_current < NO_OVERRIDES) {
	167	overrides[commandline_current].address = ints[1];
	168	overrides[commandline_current].irq = ints[2];
	169	for (i = 0; i < NO_BASES; ++i)
	170	if (bases[i].address == ints[1]) {
	171	bases[i].noauto = 1;
	172	break;
	173	}
	174	++commandline_current;
	175	}
925e4610	176	return 1;
1da177e4	177	}
925e4610 FT	178
925e4610 FT	179	__setup("dtc=", dtc_setup);
1da177e4 LT	180	#endif
	181
	182	/*
d0be4a7d	183	* Function : int dtc_detect(struct scsi_host_template * tpnt)
1da177e4 LT	184	*
	185	* Purpose : detects and initializes DTC 3180/3280 controllers
	186	* that were autoprobed, overridden on the LILO command line,
	187	* or specified at compile time.
	188	*
	189	* Inputs : tpnt - template for this SCSI adapter.
	190	*
	191	* Returns : 1 if a host adapter was found, 0 if not.
	192	*
	193	*/
	194
d0be4a7d	195	static int __init dtc_detect(struct scsi_host_template * tpnt)
1da177e4 LT	196	{
	197	static int current_override = 0, current_base = 0;
	198	struct Scsi_Host *instance;
	199	unsigned int addr;
	200	void __iomem *base;
	201	int sig, count;
	202
1da177e4 LT	203	for (count = 0; current_override < NO_OVERRIDES; ++current_override) {
	204	addr = 0;
	205	base = NULL;
	206
	207	if (overrides[current_override].address) {
	208	addr = overrides[current_override].address;
	209	base = ioremap(addr, 0x2000);
	210	if (!base)
	211	addr = 0;
	212	} else
	213	for (; !addr && (current_base < NO_BASES); ++current_base) {
	214	#if (DTCDEBUG & DTCDEBUG_INIT)
1fbe8529	215	printk(KERN_DEBUG "scsi-dtc : probing address %08x\n", bases[current_base].address);
1da177e4 LT	216	#endif
	217	if (bases[current_base].noauto)
	218	continue;
	219	base = ioremap(bases[current_base].address, 0x2000);
	220	if (!base)
	221	continue;
	222	for (sig = 0; sig < NO_SIGNATURES; ++sig) {
	223	if (check_signature(base + signatures[sig].offset, signatures[sig].string, strlen(signatures[sig].string))) {
	224	addr = bases[current_base].address;
	225	#if (DTCDEBUG & DTCDEBUG_INIT)
5307b1e8	226	printk(KERN_DEBUG "scsi-dtc : detected board.\n");
1da177e4 LT	227	#endif
	228	goto found;
	229	}
	230	}
	231	iounmap(base);
	232	}
	233
	234	#if defined(DTCDEBUG) && (DTCDEBUG & DTCDEBUG_INIT)
1fbe8529	235	printk(KERN_DEBUG "scsi-dtc : base = %08x\n", addr);
1da177e4 LT	236	#endif
	237
	238	if (!addr)
	239	break;
	240
	241	found:
	242	instance = scsi_register(tpnt, sizeof(struct NCR5380_hostdata));
	243	if (instance == NULL)
	244	break;
	245
	246	instance->base = addr;
	247	((struct NCR5380_hostdata *)(instance)->hostdata)->base = base;
	248
	249	NCR5380_init(instance, 0);
	250
	251	NCR5380_write(DTC_CONTROL_REG, CSR_5380_INTR); /* Enable int's */
	252	if (overrides[current_override].irq != IRQ_AUTO)
	253	instance->irq = overrides[current_override].irq;
	254	else
	255	instance->irq = NCR5380_probe_irq(instance, DTC_IRQS);
	256
22f5f10d FT	257	/* Compatibility with documented NCR5380 kernel parameters */
	258	if (instance->irq == 255)
	259	instance->irq = NO_IRQ;
	260
1da177e4 LT	261	#ifndef DONT_USE_INTR
	262	/* With interrupts enabled, it will sometimes hang when doing heavy
	263	* reads. So better not enable them until I finger it out. */
22f5f10d	264	if (instance->irq != NO_IRQ)
4909cc2b	265	if (request_irq(instance->irq, dtc_intr, 0,
1e641664	266	"dtc", instance)) {
1da177e4	267	printk(KERN_ERR "scsi%d : IRQ%d not free, interrupts disabled\n", instance->host_no, instance->irq);
22f5f10d	268	instance->irq = NO_IRQ;
1da177e4 LT	269	}
1da177e4 LT	270
22f5f10d	271	if (instance->irq == NO_IRQ) {
1da177e4 LT	272	printk(KERN_WARNING "scsi%d : interrupts not enabled. for better interactive performance,\n", instance->host_no);
	273	printk(KERN_WARNING "scsi%d : please jumper the board for a free IRQ.\n", instance->host_no);
	274	}
	275	#else
22f5f10d	276	if (instance->irq != NO_IRQ)
1da177e4	277	printk(KERN_WARNING "scsi%d : interrupts not used. Might as well not jumper it.\n", instance->host_no);
22f5f10d	278	instance->irq = NO_IRQ;
1da177e4 LT	279	#endif
	280	#if defined(DTCDEBUG) && (DTCDEBUG & DTCDEBUG_INIT)
	281	printk("scsi%d : irq = %d\n", instance->host_no, instance->irq);
	282	#endif
	283
1da177e4 LT	284	++current_override;
	285	++count;
	286	}
	287	return count;
	288	}
	289
	290	/*
	291	* Function : int dtc_biosparam(Disk * disk, struct block_device dev, int ip)
	292	*
	293	* Purpose : Generates a BIOS / DOS compatible H-C-S mapping for
	294	* the specified device / size.
	295	*
	296	* Inputs : size = size of device in sectors (512 bytes), dev = block device
	297	* major / minor, ip[] = {heads, sectors, cylinders}
	298	*
	299	* Returns : always 0 (success), initializes ip
	300	*
	301	*/
	302
	303	/*
	304	* XXX Most SCSI boards use this mapping, I could be incorrect. Some one
	305	* using hard disks on a trantor should verify that this mapping corresponds
	306	* to that used by the BIOS / ASPI driver by running the linux fdisk program
	307	* and matching the H_C_S coordinates to what DOS uses.
	308	*/
	309
	310	static int dtc_biosparam(struct scsi_device sdev, struct block_device dev,
	311	sector_t capacity, int *ip)
	312	{
	313	int size = capacity;
	314
	315	ip[0] = 64;
	316	ip[1] = 32;
	317	ip[2] = size >> 11;
	318	return 0;
	319	}
	320
	321
	322	/****************************************************************
	323	* Function : int NCR5380_pread (struct Scsi_Host *instance,
	324	* unsigned char *dst, int len)
	325	*
	326	* Purpose : Fast 5380 pseudo-dma read function, reads len bytes to
	327	* dst
	328	*
	329	* Inputs : dst = destination, len = length in bytes
	330	*
	331	* Returns : 0 on success, non zero on a failure such as a watchdog
	332	* timeout.
	333	*/
	334
1da177e4 LT	335	static inline int NCR5380_pread(struct Scsi_Host instance, unsigned char dst, int len)
	336	{
	337	unsigned char *d = dst;
	338	int i; /* For counting time spent in the poll-loop */
a9c2dc43	339	struct NCR5380_hostdata *hostdata = shost_priv(instance);
1da177e4 LT	340	NCR5380_local_declare();
	341	NCR5380_setup(instance);
	342
	343	i = 0;
	344	NCR5380_read(RESET_PARITY_INTERRUPT_REG);
	345	NCR5380_write(MODE_REG, MR_ENABLE_EOP_INTR \| MR_DMA_MODE);
22f5f10d	346	if (instance->irq == NO_IRQ)
1da177e4 LT	347	NCR5380_write(DTC_CONTROL_REG, CSR_DIR_READ);
	348	else
	349	NCR5380_write(DTC_CONTROL_REG, CSR_DIR_READ \| CSR_INT_BASE);
	350	NCR5380_write(DTC_BLK_CNT, len >> 7); /* Block count */
	351	rtrc(1);
	352	while (len > 0) {
	353	rtrc(2);
	354	while (NCR5380_read(DTC_CONTROL_REG) & CSR_HOST_BUF_NOT_RDY)
	355	++i;
	356	rtrc(3);
	357	memcpy_fromio(d, base + DTC_DATA_BUF, 128);
	358	d += 128;
	359	len -= 128;
	360	rtrc(7);
	361	/*** with int's on, it sometimes hangs after here.
	362	* Looks like something makes HBNR go away. */
	363	}
	364	rtrc(4);
	365	while (!(NCR5380_read(DTC_CONTROL_REG) & D_CR_ACCESS))
	366	++i;
	367	NCR5380_write(MODE_REG, 0); /* Clear the operating mode */
	368	rtrc(0);
	369	NCR5380_read(RESET_PARITY_INTERRUPT_REG);
a9c2dc43 FT	370	if (i > hostdata->spin_max_r)
a9c2dc43 FT	371	hostdata->spin_max_r = i;
1da177e4 LT	372	return (0);
	373	}
	374
	375	/****************************************************************
	376	* Function : int NCR5380_pwrite (struct Scsi_Host *instance,
	377	* unsigned char *src, int len)
	378	*
	379	* Purpose : Fast 5380 pseudo-dma write function, transfers len bytes from
	380	* src
	381	*
	382	* Inputs : src = source, len = length in bytes
	383	*
	384	* Returns : 0 on success, non zero on a failure such as a watchdog
	385	* timeout.
	386	*/
	387
	388	static inline int NCR5380_pwrite(struct Scsi_Host instance, unsigned char src, int len)
	389	{
	390	int i;
a9c2dc43	391	struct NCR5380_hostdata *hostdata = shost_priv(instance);
1da177e4 LT	392	NCR5380_local_declare();
	393	NCR5380_setup(instance);
	394
	395	NCR5380_read(RESET_PARITY_INTERRUPT_REG);
	396	NCR5380_write(MODE_REG, MR_ENABLE_EOP_INTR \| MR_DMA_MODE);
	397	/* set direction (write) */
22f5f10d	398	if (instance->irq == NO_IRQ)
1da177e4 LT	399	NCR5380_write(DTC_CONTROL_REG, 0);
	400	else
	401	NCR5380_write(DTC_CONTROL_REG, CSR_5380_INTR);
	402	NCR5380_write(DTC_BLK_CNT, len >> 7); /* Block count */
	403	for (i = 0; len > 0; ++i) {
	404	rtrc(5);
	405	/* Poll until the host buffer can accept data. */
	406	while (NCR5380_read(DTC_CONTROL_REG) & CSR_HOST_BUF_NOT_RDY)
	407	++i;
	408	rtrc(3);
	409	memcpy_toio(base + DTC_DATA_BUF, src, 128);
	410	src += 128;
	411	len -= 128;
	412	}
	413	rtrc(4);
	414	while (!(NCR5380_read(DTC_CONTROL_REG) & D_CR_ACCESS))
	415	++i;
	416	rtrc(6);
	417	/* Wait until the last byte has been sent to the disk */
	418	while (!(NCR5380_read(TARGET_COMMAND_REG) & TCR_LAST_BYTE_SENT))
	419	++i;
	420	rtrc(7);
	421	/* Check for parity error here. fixme. */
	422	NCR5380_write(MODE_REG, 0); /* Clear the operating mode */
	423	rtrc(0);
a9c2dc43 FT	424	if (i > hostdata->spin_max_w)
a9c2dc43 FT	425	hostdata->spin_max_w = i;
1da177e4 LT	426	return (0);
	427	}
	428
	429	MODULE_LICENSE("GPL");
	430
	431	#include "NCR5380.c"
	432
	433	static int dtc_release(struct Scsi_Host *shost)
	434	{
	435	NCR5380_local_declare();
	436	NCR5380_setup(shost);
22f5f10d	437	if (shost->irq != NO_IRQ)
1e641664	438	free_irq(shost->irq, shost);
1da177e4 LT	439	NCR5380_exit(shost);
	440	if (shost->io_port && shost->n_io_port)
	441	release_region(shost->io_port, shost->n_io_port);
	442	scsi_unregister(shost);
	443	iounmap(base);
	444	return 0;
	445	}
	446
d0be4a7d	447	static struct scsi_host_template driver_template = {
1da177e4 LT	448	.name = "DTC 3180/3280 ",
	449	.detect = dtc_detect,
	450	.release = dtc_release,
4d3d2a54 FT	451	.proc_name = "dtc3x80",
	452	.show_info = dtc_show_info,
	453	.write_info = dtc_write_info,
8c32513b	454	.info = dtc_info,
1da177e4 LT	455	.queuecommand = dtc_queue_command,
	456	.eh_abort_handler = dtc_abort,
	457	.eh_bus_reset_handler = dtc_bus_reset,
1da177e4 LT	458	.bios_param = dtc_biosparam,
	459	.can_queue = CAN_QUEUE,
	460	.this_id = 7,
	461	.sg_tablesize = SG_ALL,
	462	.cmd_per_lun = CMD_PER_LUN,
	463	.use_clustering = DISABLE_CLUSTERING,
	464	};
	465	#include "scsi_module.c"