[mirror_ubuntu-zesty-kernel.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.
 *
 * For more information, please consult 
 *
 * NCR 5380 Family
 * SCSI Protocol Controller
 * Databook
*/

/*
 * Options : 
 * PSEUDO_DMA - enables PSEUDO-DMA hardware, should give a 3-4X performance
 * increase compared to polled I/O.
 *
 * PARITY - enable parity checking.  Not supported.
 *
 * UNSAFE - leave interrupts enabled during pseudo-DMA transfers. 
 *		You probably want this.
 *
 * 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);

#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 != SCSI_IRQ_NONE)
			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 = SCSI_IRQ_NONE;
			}

		if (instance->irq == SCSI_IRQ_NONE) {
			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 != SCSI_IRQ_NONE)
			printk(KERN_WARNING "scsi%d : interrupts not used. Might as well not jumper it.\n", instance->host_no);
		instance->irq = SCSI_IRQ_NONE;
#endif
#if defined(DTCDEBUG) && (DTCDEBUG & DTCDEBUG_INIT)
		printk("scsi%d : irq = %d\n", instance->host_no, instance->irq);
#endif

		printk(KERN_INFO "scsi%d : at 0x%05X", instance->host_no, (int) instance->base);
		if (instance->irq == SCSI_IRQ_NONE)
			printk(" interrupts disabled");
		else
			printk(" irq %d", instance->irq);
		printk(" options CAN_QUEUE=%d  CMD_PER_LUN=%d release=%d", CAN_QUEUE, CMD_PER_LUN, DTC_PUBLIC_RELEASE);
		NCR5380_print_options(instance);
		printk("\n");

		++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 int dtc_maxi = 0;
static int dtc_wmaxi = 0;

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 */
	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 == SCSI_IRQ_NONE)
		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 > dtc_maxi)
		dtc_maxi = 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;
	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 == SCSI_IRQ_NONE)
		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 > dtc_wmaxi)
		dtc_wmaxi = 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)
		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,
	.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.
	22	*
	23	* For more information, please consult
	24	*
	25	* NCR 5380 Family
	26	* SCSI Protocol Controller
	27	* Databook
	28	*/
	29
	30	/*
	31	* Options :
1da177e4 LT	32	* PSEUDO_DMA - enables PSEUDO-DMA hardware, should give a 3-4X performance
	33	* increase compared to polled I/O.
	34	*
	35	* PARITY - enable parity checking. Not supported.
	36	*
	37	* UNSAFE - leave interrupts enabled during pseudo-DMA transfers.
	38	* You probably want this.
	39	*
	40	* The card is detected and initialized in one of several ways :
	41	* 1. Autoprobe (default) - since the board is memory mapped,
	42	* a BIOS signature is scanned for to locate the registers.
	43	* An interrupt is triggered to autoprobe for the interrupt
	44	* line.
	45	*
	46	* 2. With command line overrides - dtc=address,irq may be
	47	* used on the LILO command line to override the defaults.
	48	*
	49	*/
	50
	51	/----------------------------------------------------------------/
	52	/* the following will set the monitor border color (useful to find
	53	where something crashed or gets stuck at */
	54	/* 1 = blue
	55	2 = green
	56	3 = cyan
	57	4 = red
	58	5 = magenta
	59	6 = yellow
	60	7 = white
	61	*/
	62	#if 0
	63	#define rtrc(i) {inb(0x3da); outb(0x31, 0x3c0); outb((i), 0x3c0);}
	64	#else
	65	#define rtrc(i) {}
	66	#endif
	67
	68
1da177e4 LT	69	#include <linux/module.h>
1da177e4 LT	70	#include <linux/signal.h>
1da177e4 LT	71	#include <linux/blkdev.h>
	72	#include <linux/delay.h>
	73	#include <linux/stat.h>
	74	#include <linux/string.h>
	75	#include <linux/init.h>
	76	#include <linux/interrupt.h>
53d5ed62	77	#include <linux/io.h>
1da177e4 LT	78	#include "scsi.h"
	79	#include <scsi/scsi_host.h>
	80	#include "dtc.h"
	81	#define AUTOPROBE_IRQ
	82	#include "NCR5380.h"
	83
	84
	85	#define DTC_PUBLIC_RELEASE 2
	86
1da177e4 LT	87	/*
	88	* The DTC3180 & 3280 boards are memory mapped.
	89	*
	90	*/
	91
	92	/*
	93	*/
	94	/* Offset from DTC_5380_OFFSET */
	95	#define DTC_CONTROL_REG 0x100 /* rw */
	96	#define D_CR_ACCESS 0x80 /* ro set=can access 3280 registers */
	97	#define CSR_DIR_READ 0x40 /* rw direction, 1 = read 0 = write */
	98
	99	#define CSR_RESET 0x80 /* wo Resets 53c400 */
	100	#define CSR_5380_REG 0x80 /* ro 5380 registers can be accessed */
	101	#define CSR_TRANS_DIR 0x40 /* rw Data transfer direction */
	102	#define CSR_SCSI_BUFF_INTR 0x20 /* rw Enable int on transfer ready */
	103	#define CSR_5380_INTR 0x10 /* rw Enable 5380 interrupts */
	104	#define CSR_SHARED_INTR 0x08 /* rw Interrupt sharing */
	105	#define CSR_HOST_BUF_NOT_RDY 0x04 /* ro Host buffer not ready */
	106	#define CSR_SCSI_BUF_RDY 0x02 /* ro SCSI buffer ready */
	107	#define CSR_GATED_5380_IRQ 0x01 /* ro Last block xferred */
	108	#define CSR_INT_BASE (CSR_SCSI_BUFF_INTR \| CSR_5380_INTR)
	109
	110
	111	#define DTC_BLK_CNT 0x101 /* rw
	112	* # of 128-byte blocks to transfer */
	113
	114
	115	#define D_CR_ACCESS 0x80 /* ro set=can access 3280 registers */
	116
	117	#define DTC_SWITCH_REG 0x3982 /* ro - DIP switches */
	118	#define DTC_RESUME_XFER 0x3982 /* wo - resume data xfer
	119	* after disconnect/reconnect*/
	120
	121	#define DTC_5380_OFFSET 0x3880 /* 8 registers here, see NCR5380.h */
	122
	123	/!!!! for dtc, it's a 128 byte buffer at 3900 !!! /
	124	#define DTC_DATA_BUF 0x3900 /* rw 128 bytes long */
	125
	126	static struct override {
	127	unsigned int address;
	128	int irq;
	129	} overrides
	130	#ifdef OVERRIDE
	131	[] __initdata = OVERRIDE;
	132	#else
1fbe8529 AC	133	[4] __initdata = {
	134	{ 0, IRQ_AUTO }, { 0, IRQ_AUTO }, { 0, IRQ_AUTO }, { 0, IRQ_AUTO }
	135	};
1da177e4 LT	136	#endif
1da177e4 LT	137
6391a113	138	#define NO_OVERRIDES ARRAY_SIZE(overrides)
1da177e4 LT	139
	140	static struct base {
	141	unsigned long address;
	142	int noauto;
6391a113 TK	143	} bases[] __initdata = {
	144	{ 0xcc000, 0 },
	145	{ 0xc8000, 0 },
	146	{ 0xdc000, 0 },
1da177e4 LT	147	{ 0xd8000, 0 }
	148	};
	149
6391a113	150	#define NO_BASES ARRAY_SIZE(bases)
1da177e4 LT	151
	152	static const struct signature {
	153	const char *string;
	154	int offset;
6391a113	155	} signatures[] = {
1da177e4 LT	156	{"DATA TECHNOLOGY CORPORATION BIOS", 0x25},
	157	};
	158
6391a113	159	#define NO_SIGNATURES ARRAY_SIZE(signatures)
1da177e4 LT	160
	161	#ifndef MODULE
	162	/*
	163	* Function : dtc_setup(char str, int ints)
	164	*
	165	* Purpose : LILO command line initialization of the overrides array,
6391a113	166	*
1da177e4 LT	167	* Inputs : str - unused, ints - array of integer parameters with ints[0]
	168	* equal to the number of ints.
	169	*
1fbe8529	170	*/
1da177e4	171
925e4610	172	static int __init dtc_setup(char *str)
1da177e4 LT	173	{
	174	static int commandline_current = 0;
	175	int i;
925e4610 FT	176	int ints[10];
	177
	178	get_options(str, ARRAY_SIZE(ints), ints);
1da177e4 LT	179	if (ints[0] != 2)
	180	printk("dtc_setup: usage dtc=address,irq\n");
	181	else if (commandline_current < NO_OVERRIDES) {
	182	overrides[commandline_current].address = ints[1];
	183	overrides[commandline_current].irq = ints[2];
	184	for (i = 0; i < NO_BASES; ++i)
	185	if (bases[i].address == ints[1]) {
	186	bases[i].noauto = 1;
	187	break;
	188	}
	189	++commandline_current;
	190	}
925e4610	191	return 1;
1da177e4	192	}
925e4610 FT	193
925e4610 FT	194	__setup("dtc=", dtc_setup);
1da177e4 LT	195	#endif
	196
	197	/*
d0be4a7d	198	* Function : int dtc_detect(struct scsi_host_template * tpnt)
1da177e4 LT	199	*
	200	* Purpose : detects and initializes DTC 3180/3280 controllers
	201	* that were autoprobed, overridden on the LILO command line,
	202	* or specified at compile time.
	203	*
	204	* Inputs : tpnt - template for this SCSI adapter.
	205	*
	206	* Returns : 1 if a host adapter was found, 0 if not.
	207	*
	208	*/
	209
d0be4a7d	210	static int __init dtc_detect(struct scsi_host_template * tpnt)
1da177e4 LT	211	{
	212	static int current_override = 0, current_base = 0;
	213	struct Scsi_Host *instance;
	214	unsigned int addr;
	215	void __iomem *base;
	216	int sig, count;
	217
1da177e4 LT	218	for (count = 0; current_override < NO_OVERRIDES; ++current_override) {
	219	addr = 0;
	220	base = NULL;
	221
	222	if (overrides[current_override].address) {
	223	addr = overrides[current_override].address;
	224	base = ioremap(addr, 0x2000);
	225	if (!base)
	226	addr = 0;
	227	} else
	228	for (; !addr && (current_base < NO_BASES); ++current_base) {
	229	#if (DTCDEBUG & DTCDEBUG_INIT)
1fbe8529	230	printk(KERN_DEBUG "scsi-dtc : probing address %08x\n", bases[current_base].address);
1da177e4 LT	231	#endif
	232	if (bases[current_base].noauto)
	233	continue;
	234	base = ioremap(bases[current_base].address, 0x2000);
	235	if (!base)
	236	continue;
	237	for (sig = 0; sig < NO_SIGNATURES; ++sig) {
	238	if (check_signature(base + signatures[sig].offset, signatures[sig].string, strlen(signatures[sig].string))) {
	239	addr = bases[current_base].address;
	240	#if (DTCDEBUG & DTCDEBUG_INIT)
5307b1e8	241	printk(KERN_DEBUG "scsi-dtc : detected board.\n");
1da177e4 LT	242	#endif
	243	goto found;
	244	}
	245	}
	246	iounmap(base);
	247	}
	248
	249	#if defined(DTCDEBUG) && (DTCDEBUG & DTCDEBUG_INIT)
1fbe8529	250	printk(KERN_DEBUG "scsi-dtc : base = %08x\n", addr);
1da177e4 LT	251	#endif
	252
	253	if (!addr)
	254	break;
	255
	256	found:
	257	instance = scsi_register(tpnt, sizeof(struct NCR5380_hostdata));
	258	if (instance == NULL)
	259	break;
	260
	261	instance->base = addr;
	262	((struct NCR5380_hostdata *)(instance)->hostdata)->base = base;
	263
	264	NCR5380_init(instance, 0);
	265
	266	NCR5380_write(DTC_CONTROL_REG, CSR_5380_INTR); /* Enable int's */
	267	if (overrides[current_override].irq != IRQ_AUTO)
	268	instance->irq = overrides[current_override].irq;
	269	else
	270	instance->irq = NCR5380_probe_irq(instance, DTC_IRQS);
	271
	272	#ifndef DONT_USE_INTR
	273	/* With interrupts enabled, it will sometimes hang when doing heavy
	274	* reads. So better not enable them until I finger it out. */
	275	if (instance->irq != SCSI_IRQ_NONE)
4909cc2b	276	if (request_irq(instance->irq, dtc_intr, 0,
1e641664	277	"dtc", instance)) {
1da177e4 LT	278	printk(KERN_ERR "scsi%d : IRQ%d not free, interrupts disabled\n", instance->host_no, instance->irq);
	279	instance->irq = SCSI_IRQ_NONE;
	280	}
	281
	282	if (instance->irq == SCSI_IRQ_NONE) {
	283	printk(KERN_WARNING "scsi%d : interrupts not enabled. for better interactive performance,\n", instance->host_no);
	284	printk(KERN_WARNING "scsi%d : please jumper the board for a free IRQ.\n", instance->host_no);
	285	}
	286	#else
	287	if (instance->irq != SCSI_IRQ_NONE)
	288	printk(KERN_WARNING "scsi%d : interrupts not used. Might as well not jumper it.\n", instance->host_no);
	289	instance->irq = SCSI_IRQ_NONE;
	290	#endif
	291	#if defined(DTCDEBUG) && (DTCDEBUG & DTCDEBUG_INIT)
	292	printk("scsi%d : irq = %d\n", instance->host_no, instance->irq);
	293	#endif
	294
	295	printk(KERN_INFO "scsi%d : at 0x%05X", instance->host_no, (int) instance->base);
	296	if (instance->irq == SCSI_IRQ_NONE)
	297	printk(" interrupts disabled");
	298	else
	299	printk(" irq %d", instance->irq);
	300	printk(" options CAN_QUEUE=%d CMD_PER_LUN=%d release=%d", CAN_QUEUE, CMD_PER_LUN, DTC_PUBLIC_RELEASE);
	301	NCR5380_print_options(instance);
	302	printk("\n");
	303
	304	++current_override;
	305	++count;
	306	}
	307	return count;
	308	}
	309
	310	/*
	311	* Function : int dtc_biosparam(Disk * disk, struct block_device dev, int ip)
	312	*
	313	* Purpose : Generates a BIOS / DOS compatible H-C-S mapping for
	314	* the specified device / size.
	315	*
	316	* Inputs : size = size of device in sectors (512 bytes), dev = block device
	317	* major / minor, ip[] = {heads, sectors, cylinders}
	318	*
	319	* Returns : always 0 (success), initializes ip
	320	*
	321	*/
	322
	323	/*
	324	* XXX Most SCSI boards use this mapping, I could be incorrect. Some one
	325	* using hard disks on a trantor should verify that this mapping corresponds
	326	* to that used by the BIOS / ASPI driver by running the linux fdisk program
	327	* and matching the H_C_S coordinates to what DOS uses.
	328	*/
	329
	330	static int dtc_biosparam(struct scsi_device sdev, struct block_device dev,
	331	sector_t capacity, int *ip)
	332	{
	333	int size = capacity;
	334
	335	ip[0] = 64;
	336	ip[1] = 32;
	337	ip[2] = size >> 11;
	338	return 0;
	339	}
	340
	341
342	/****************************************************************
343	* Function : int NCR5380_pread (struct Scsi_Host *instance,
344	* unsigned char *dst, int len)
345	*
346	* Purpose : Fast 5380 pseudo-dma read function, reads len bytes to
347	* dst
348	*
349	* Inputs : dst = destination, len = length in bytes
350	*
351	* Returns : 0 on success, non zero on a failure such as a watchdog
352	* timeout.
353	*/
354
355	static int dtc_maxi = 0;
356	static int dtc_wmaxi = 0;
357
358	static inline int NCR5380_pread(struct Scsi_Host instance, unsigned char dst, int len)
359	{
360	unsigned char *d = dst;
361	int i; /* For counting time spent in the poll-loop */
362	NCR5380_local_declare();
363	NCR5380_setup(instance);
364
365	i = 0;
366	NCR5380_read(RESET_PARITY_INTERRUPT_REG);
367	NCR5380_write(MODE_REG, MR_ENABLE_EOP_INTR \| MR_DMA_MODE);
368	if (instance->irq == SCSI_IRQ_NONE)
369	NCR5380_write(DTC_CONTROL_REG, CSR_DIR_READ);
370	else
371	NCR5380_write(DTC_CONTROL_REG, CSR_DIR_READ \| CSR_INT_BASE);
372	NCR5380_write(DTC_BLK_CNT, len >> 7); /* Block count */
373	rtrc(1);
374	while (len > 0) {
375	rtrc(2);
376	while (NCR5380_read(DTC_CONTROL_REG) & CSR_HOST_BUF_NOT_RDY)
377	++i;
378	rtrc(3);
379	memcpy_fromio(d, base + DTC_DATA_BUF, 128);
380	d += 128;
381	len -= 128;
382	rtrc(7);
383	/*** with int's on, it sometimes hangs after here.
384	* Looks like something makes HBNR go away. */
385	}
386	rtrc(4);
387	while (!(NCR5380_read(DTC_CONTROL_REG) & D_CR_ACCESS))
388	++i;
389	NCR5380_write(MODE_REG, 0); /* Clear the operating mode */
390	rtrc(0);
391	NCR5380_read(RESET_PARITY_INTERRUPT_REG);
392	if (i > dtc_maxi)
393	dtc_maxi = i;
394	return (0);
395	}
396
397	/****************************************************************
398	* Function : int NCR5380_pwrite (struct Scsi_Host *instance,
399	* unsigned char *src, int len)
400	*
401	* Purpose : Fast 5380 pseudo-dma write function, transfers len bytes from
402	* src
403	*
404	* Inputs : src = source, len = length in bytes
405	*
406	* Returns : 0 on success, non zero on a failure such as a watchdog
407	* timeout.
408	*/
409
410	static inline int NCR5380_pwrite(struct Scsi_Host instance, unsigned char src, int len)
411	{
412	int i;
413	NCR5380_local_declare();
414	NCR5380_setup(instance);
415
416	NCR5380_read(RESET_PARITY_INTERRUPT_REG);
417	NCR5380_write(MODE_REG, MR_ENABLE_EOP_INTR \| MR_DMA_MODE);
418	/* set direction (write) */
419	if (instance->irq == SCSI_IRQ_NONE)
420	NCR5380_write(DTC_CONTROL_REG, 0);
421	else
422	NCR5380_write(DTC_CONTROL_REG, CSR_5380_INTR);
423	NCR5380_write(DTC_BLK_CNT, len >> 7); /* Block count */
424	for (i = 0; len > 0; ++i) {
425	rtrc(5);
426	/* Poll until the host buffer can accept data. */
427	while (NCR5380_read(DTC_CONTROL_REG) & CSR_HOST_BUF_NOT_RDY)
428	++i;
429	rtrc(3);
430	memcpy_toio(base + DTC_DATA_BUF, src, 128);
431	src += 128;
432	len -= 128;
433	}
434	rtrc(4);
435	while (!(NCR5380_read(DTC_CONTROL_REG) & D_CR_ACCESS))
436	++i;
437	rtrc(6);
438	/* Wait until the last byte has been sent to the disk */
439	while (!(NCR5380_read(TARGET_COMMAND_REG) & TCR_LAST_BYTE_SENT))
440	++i;
441	rtrc(7);
442	/* Check for parity error here. fixme. */
443	NCR5380_write(MODE_REG, 0); /* Clear the operating mode */
444	rtrc(0);
445	if (i > dtc_wmaxi)
446	dtc_wmaxi = i;
447	return (0);
448	}
449
450	MODULE_LICENSE("GPL");
451
452	#include "NCR5380.c"
453
454	static int dtc_release(struct Scsi_Host *shost)
455	{
456	NCR5380_local_declare();
457	NCR5380_setup(shost);
458	if (shost->irq)
1e641664	459	free_irq(shost->irq, shost);
1da177e4 LT	460	NCR5380_exit(shost);
	461	if (shost->io_port && shost->n_io_port)
	462	release_region(shost->io_port, shost->n_io_port);
	463	scsi_unregister(shost);
	464	iounmap(base);
	465	return 0;
	466	}
	467
d0be4a7d	468	static struct scsi_host_template driver_template = {
1da177e4 LT	469	.name = "DTC 3180/3280 ",
	470	.detect = dtc_detect,
	471	.release = dtc_release,
4d3d2a54 FT	472	.proc_name = "dtc3x80",
	473	.show_info = dtc_show_info,
	474	.write_info = dtc_write_info,
1da177e4 LT	475	.queuecommand = dtc_queue_command,
	476	.eh_abort_handler = dtc_abort,
	477	.eh_bus_reset_handler = dtc_bus_reset,
1da177e4 LT	478	.bios_param = dtc_biosparam,
	479	.can_queue = CAN_QUEUE,
	480	.this_id = 7,
	481	.sg_tablesize = SG_ALL,
	482	.cmd_per_lun = CMD_PER_LUN,
	483	.use_clustering = DISABLE_CLUSTERING,
	484	};
	485	#include "scsi_module.c"