[deliverable/linux.git] / drivers / scsi / dtc.c

#define DONT_USE_INTR

/*
 * 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
 */

/*
 * 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/blkdev.h>
#include <linux/string.h>
#include <linux/init.h>
#include <linux/interrupt.h>
#include <linux/io.h>
#include <scsi/scsi_host.h>

#include "dtc.h"
#define AUTOPROBE_IRQ
#include "NCR5380.h"

/*
 * 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;
	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, current_base;
	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) {
				dprintk(NDEBUG_INIT, "dtc: probing address 0x%08x\n",
				        (unsigned int)bases[current_base].address);
				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;
						dprintk(NDEBUG_INIT, "dtc: detected board\n");
						goto found;
					}
				}
				iounmap(base);
			}

		dprintk(NDEBUG_INIT, "dtc: addr = 0x%08x\n", addr);

		if (!addr)
			break;

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

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

		if (NCR5380_init(instance, 0))
			goto out_unregister;

		NCR5380_maybe_reset_bus(instance);

		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
		dprintk(NDEBUG_INIT, "scsi%d : irq = %d\n",
		        instance->host_no, instance->irq);

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

out_unregister:
	scsi_unregister(instance);
out_unmap:
	iounmap(base);
	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 dtc_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);

	i = 0;
	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, hostdata->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;
	rtrc(0);
	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 dtc_pwrite(struct Scsi_Host *instance,
                             unsigned char *src, int len)
{
	int i;
	struct NCR5380_hostdata *hostdata = shost_priv(instance);

	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(hostdata->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. */
	rtrc(0);
	return (0);
}

static int dtc_dma_xfer_len(struct scsi_cmnd *cmd)
{
	int transfersize = cmd->transfersize;

	/* Limit transfers to 32K, for xx400 & xx406
	 * pseudoDMA that transfers in 128 bytes blocks.
	 */
	if (transfersize > 32 * 1024 && cmd->SCp.this_residual &&
	    !(cmd->SCp.this_residual % transfersize))
		transfersize = 32 * 1024;

	return transfersize;
}

MODULE_LICENSE("GPL");

#include "NCR5380.c"

static int dtc_release(struct Scsi_Host *shost)
{
	struct NCR5380_hostdata *hostdata = shost_priv(shost);

	if (shost->irq != NO_IRQ)
		free_irq(shost->irq, shost);
	NCR5380_exit(shost);
	scsi_unregister(shost);
	iounmap(hostdata->base);
	return 0;
}

static struct scsi_host_template driver_template = {
	.name			= "DTC 3180/3280",
	.detect			= dtc_detect,
	.release		= dtc_release,
	.proc_name		= "dtc3x80",
	.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		= 32,
	.this_id		= 7,
	.sg_tablesize		= SG_ALL,
	.cmd_per_lun		= 2,
	.use_clustering		= DISABLE_CLUSTERING,
	.cmd_size		= NCR5380_CMD_SIZE,
	.max_sectors		= 128,
};
#include "scsi_module.c"
Commit	Line	Data
1da177e4	1	#define DONT_USE_INTR
1da177e4 LT	2
	3	/*
	4	* DTC 3180/3280 driver, by
	5	* Ray Van Tassle rayvt@comm.mot.com
	6	*
	7	* taken from ...
	8	* Trantor T128/T128F/T228 driver by...
	9	*
	10	* Drew Eckhardt
	11	* Visionary Computing
	12	* (Unix and Linux consulting and custom programming)
	13	* drew@colorado.edu
	14	* +1 (303) 440-4894
3f9e986e	15	*/
1da177e4 LT	16
1da177e4 LT	17	/*
1da177e4 LT	18	* The card is detected and initialized in one of several ways :
	19	* 1. Autoprobe (default) - since the board is memory mapped,
	20	* a BIOS signature is scanned for to locate the registers.
	21	* An interrupt is triggered to autoprobe for the interrupt
	22	* line.
	23	*
	24	* 2. With command line overrides - dtc=address,irq may be
	25	* used on the LILO command line to override the defaults.
	26	*
	27	*/
	28
	29	/----------------------------------------------------------------/
	30	/* the following will set the monitor border color (useful to find
	31	where something crashed or gets stuck at */
	32	/* 1 = blue
	33	2 = green
	34	3 = cyan
	35	4 = red
	36	5 = magenta
	37	6 = yellow
	38	7 = white
	39	*/
	40	#if 0
	41	#define rtrc(i) {inb(0x3da); outb(0x31, 0x3c0); outb((i), 0x3c0);}
	42	#else
	43	#define rtrc(i) {}
	44	#endif
	45
	46
1da177e4	47	#include <linux/module.h>
1da177e4	48	#include <linux/blkdev.h>
1da177e4 LT	49	#include <linux/string.h>
	50	#include <linux/init.h>
	51	#include <linux/interrupt.h>
53d5ed62	52	#include <linux/io.h>
1da177e4	53	#include <scsi/scsi_host.h>
161c0059	54
1da177e4 LT	55	#include "dtc.h"
	56	#define AUTOPROBE_IRQ
	57	#include "NCR5380.h"
	58
1da177e4 LT	59	/*
	60	* The DTC3180 & 3280 boards are memory mapped.
	61	*
	62	*/
	63
	64	/*
	65	*/
	66	/* Offset from DTC_5380_OFFSET */
	67	#define DTC_CONTROL_REG 0x100 /* rw */
	68	#define D_CR_ACCESS 0x80 /* ro set=can access 3280 registers */
	69	#define CSR_DIR_READ 0x40 /* rw direction, 1 = read 0 = write */
	70
	71	#define CSR_RESET 0x80 /* wo Resets 53c400 */
	72	#define CSR_5380_REG 0x80 /* ro 5380 registers can be accessed */
	73	#define CSR_TRANS_DIR 0x40 /* rw Data transfer direction */
	74	#define CSR_SCSI_BUFF_INTR 0x20 /* rw Enable int on transfer ready */
	75	#define CSR_5380_INTR 0x10 /* rw Enable 5380 interrupts */
	76	#define CSR_SHARED_INTR 0x08 /* rw Interrupt sharing */
	77	#define CSR_HOST_BUF_NOT_RDY 0x04 /* ro Host buffer not ready */
	78	#define CSR_SCSI_BUF_RDY 0x02 /* ro SCSI buffer ready */
	79	#define CSR_GATED_5380_IRQ 0x01 /* ro Last block xferred */
	80	#define CSR_INT_BASE (CSR_SCSI_BUFF_INTR \| CSR_5380_INTR)
	81
	82
	83	#define DTC_BLK_CNT 0x101 /* rw
	84	* # of 128-byte blocks to transfer */
	85
	86
	87	#define D_CR_ACCESS 0x80 /* ro set=can access 3280 registers */
	88
	89	#define DTC_SWITCH_REG 0x3982 /* ro - DIP switches */
	90	#define DTC_RESUME_XFER 0x3982 /* wo - resume data xfer
	91	* after disconnect/reconnect*/
	92
	93	#define DTC_5380_OFFSET 0x3880 /* 8 registers here, see NCR5380.h */
	94
	95	/!!!! for dtc, it's a 128 byte buffer at 3900 !!! /
	96	#define DTC_DATA_BUF 0x3900 /* rw 128 bytes long */
	97
	98	static struct override {
	99	unsigned int address;
	100	int irq;
	101	} overrides
	102	#ifdef OVERRIDE
	103	[] __initdata = OVERRIDE;
	104	#else
1fbe8529 AC	105	[4] __initdata = {
	106	{ 0, IRQ_AUTO }, { 0, IRQ_AUTO }, { 0, IRQ_AUTO }, { 0, IRQ_AUTO }
	107	};
1da177e4 LT	108	#endif
1da177e4 LT	109
6391a113	110	#define NO_OVERRIDES ARRAY_SIZE(overrides)
1da177e4 LT	111
	112	static struct base {
	113	unsigned long address;
	114	int noauto;
6391a113 TK	115	} bases[] __initdata = {
	116	{ 0xcc000, 0 },
	117	{ 0xc8000, 0 },
	118	{ 0xdc000, 0 },
1da177e4 LT	119	{ 0xd8000, 0 }
	120	};
	121
6391a113	122	#define NO_BASES ARRAY_SIZE(bases)
1da177e4 LT	123
	124	static const struct signature {
	125	const char *string;
	126	int offset;
6391a113	127	} signatures[] = {
1da177e4 LT	128	{"DATA TECHNOLOGY CORPORATION BIOS", 0x25},
	129	};
	130
6391a113	131	#define NO_SIGNATURES ARRAY_SIZE(signatures)
1da177e4 LT	132
	133	#ifndef MODULE
	134	/*
	135	* Function : dtc_setup(char str, int ints)
	136	*
	137	* Purpose : LILO command line initialization of the overrides array,
6391a113	138	*
1da177e4 LT	139	* Inputs : str - unused, ints - array of integer parameters with ints[0]
	140	* equal to the number of ints.
	141	*
1fbe8529	142	*/
1da177e4	143
925e4610	144	static int __init dtc_setup(char *str)
1da177e4	145	{
d5f7e65d	146	static int commandline_current;
1da177e4	147	int i;
925e4610 FT	148	int ints[10];
	149
	150	get_options(str, ARRAY_SIZE(ints), ints);
1da177e4 LT	151	if (ints[0] != 2)
	152	printk("dtc_setup: usage dtc=address,irq\n");
	153	else if (commandline_current < NO_OVERRIDES) {
	154	overrides[commandline_current].address = ints[1];
	155	overrides[commandline_current].irq = ints[2];
	156	for (i = 0; i < NO_BASES; ++i)
	157	if (bases[i].address == ints[1]) {
	158	bases[i].noauto = 1;
	159	break;
	160	}
	161	++commandline_current;
	162	}
925e4610	163	return 1;
1da177e4	164	}
925e4610 FT	165
925e4610 FT	166	__setup("dtc=", dtc_setup);
1da177e4 LT	167	#endif
	168
	169	/*
d0be4a7d	170	* Function : int dtc_detect(struct scsi_host_template * tpnt)
1da177e4 LT	171	*
	172	* Purpose : detects and initializes DTC 3180/3280 controllers
	173	* that were autoprobed, overridden on the LILO command line,
	174	* or specified at compile time.
	175	*
	176	* Inputs : tpnt - template for this SCSI adapter.
	177	*
	178	* Returns : 1 if a host adapter was found, 0 if not.
	179	*
	180	*/
	181
d0be4a7d	182	static int __init dtc_detect(struct scsi_host_template * tpnt)
1da177e4	183	{
d5f7e65d	184	static int current_override, current_base;
1da177e4 LT	185	struct Scsi_Host *instance;
	186	unsigned int addr;
	187	void __iomem *base;
	188	int sig, count;
	189
1da177e4 LT	190	for (count = 0; current_override < NO_OVERRIDES; ++current_override) {
	191	addr = 0;
	192	base = NULL;
	193
	194	if (overrides[current_override].address) {
	195	addr = overrides[current_override].address;
	196	base = ioremap(addr, 0x2000);
	197	if (!base)
	198	addr = 0;
	199	} else
	200	for (; !addr && (current_base < NO_BASES); ++current_base) {
2f7dba9f FT	201	dprintk(NDEBUG_INIT, "dtc: probing address 0x%08x\n",
2f7dba9f FT	202	(unsigned int)bases[current_base].address);
1da177e4 LT	203	if (bases[current_base].noauto)
	204	continue;
	205	base = ioremap(bases[current_base].address, 0x2000);
	206	if (!base)
	207	continue;
	208	for (sig = 0; sig < NO_SIGNATURES; ++sig) {
	209	if (check_signature(base + signatures[sig].offset, signatures[sig].string, strlen(signatures[sig].string))) {
	210	addr = bases[current_base].address;
2f7dba9f	211	dprintk(NDEBUG_INIT, "dtc: detected board\n");
1da177e4 LT	212	goto found;
	213	}
	214	}
	215	iounmap(base);
	216	}
	217
2f7dba9f	218	dprintk(NDEBUG_INIT, "dtc: addr = 0x%08x\n", addr);
1da177e4 LT	219
	220	if (!addr)
	221	break;
	222
	223	found:
	224	instance = scsi_register(tpnt, sizeof(struct NCR5380_hostdata));
	225	if (instance == NULL)
0ad0eff9	226	goto out_unmap;
1da177e4 LT	227
	228	instance->base = addr;
	229	((struct NCR5380_hostdata *)(instance)->hostdata)->base = base;
	230
1bb46002	231	if (NCR5380_init(instance, 0))
0ad0eff9	232	goto out_unregister;
1da177e4	233
b6488f97 FT	234	NCR5380_maybe_reset_bus(instance);
b6488f97 FT	235
1da177e4 LT	236	NCR5380_write(DTC_CONTROL_REG, CSR_5380_INTR); /* Enable int's */
	237	if (overrides[current_override].irq != IRQ_AUTO)
	238	instance->irq = overrides[current_override].irq;
	239	else
	240	instance->irq = NCR5380_probe_irq(instance, DTC_IRQS);
	241
22f5f10d FT	242	/* Compatibility with documented NCR5380 kernel parameters */
	243	if (instance->irq == 255)
	244	instance->irq = NO_IRQ;
	245
1da177e4 LT	246	#ifndef DONT_USE_INTR
	247	/* With interrupts enabled, it will sometimes hang when doing heavy
	248	* reads. So better not enable them until I finger it out. */
22f5f10d	249	if (instance->irq != NO_IRQ)
4909cc2b	250	if (request_irq(instance->irq, dtc_intr, 0,
1e641664	251	"dtc", instance)) {
1da177e4	252	printk(KERN_ERR "scsi%d : IRQ%d not free, interrupts disabled\n", instance->host_no, instance->irq);
22f5f10d	253	instance->irq = NO_IRQ;
1da177e4 LT	254	}
1da177e4 LT	255
22f5f10d	256	if (instance->irq == NO_IRQ) {
1da177e4 LT	257	printk(KERN_WARNING "scsi%d : interrupts not enabled. for better interactive performance,\n", instance->host_no);
	258	printk(KERN_WARNING "scsi%d : please jumper the board for a free IRQ.\n", instance->host_no);
	259	}
	260	#else
22f5f10d	261	if (instance->irq != NO_IRQ)
1da177e4	262	printk(KERN_WARNING "scsi%d : interrupts not used. Might as well not jumper it.\n", instance->host_no);
22f5f10d	263	instance->irq = NO_IRQ;
1da177e4	264	#endif
2f7dba9f FT	265	dprintk(NDEBUG_INIT, "scsi%d : irq = %d\n",
2f7dba9f FT	266	instance->host_no, instance->irq);
1da177e4	267
1da177e4 LT	268	++current_override;
	269	++count;
	270	}
	271	return count;
0ad0eff9 FT	272
	273	out_unregister:
	274	scsi_unregister(instance);
	275	out_unmap:
	276	iounmap(base);
	277	return count;
1da177e4 LT	278	}
	279
	280	/*
	281	* Function : int dtc_biosparam(Disk * disk, struct block_device dev, int ip)
	282	*
	283	* Purpose : Generates a BIOS / DOS compatible H-C-S mapping for
	284	* the specified device / size.
	285	*
	286	* Inputs : size = size of device in sectors (512 bytes), dev = block device
	287	* major / minor, ip[] = {heads, sectors, cylinders}
	288	*
	289	* Returns : always 0 (success), initializes ip
	290	*
	291	*/
	292
	293	/*
	294	* XXX Most SCSI boards use this mapping, I could be incorrect. Some one
	295	* using hard disks on a trantor should verify that this mapping corresponds
	296	* to that used by the BIOS / ASPI driver by running the linux fdisk program
	297	* and matching the H_C_S coordinates to what DOS uses.
	298	*/
	299
	300	static int dtc_biosparam(struct scsi_device sdev, struct block_device dev,
	301	sector_t capacity, int *ip)
	302	{
	303	int size = capacity;
	304
	305	ip[0] = 64;
	306	ip[1] = 32;
	307	ip[2] = size >> 11;
	308	return 0;
	309	}
	310
	311
	312	/****************************************************************
	313	* Function : int NCR5380_pread (struct Scsi_Host *instance,
	314	* unsigned char *dst, int len)
	315	*
	316	* Purpose : Fast 5380 pseudo-dma read function, reads len bytes to
	317	* dst
	318	*
	319	* Inputs : dst = destination, len = length in bytes
	320	*
	321	* Returns : 0 on success, non zero on a failure such as a watchdog
	322	* timeout.
	323	*/
	324
6c4b88ca FT	325	static inline int dtc_pread(struct Scsi_Host *instance,
6c4b88ca FT	326	unsigned char *dst, int len)
1da177e4 LT	327	{
	328	unsigned char *d = dst;
	329	int i; /* For counting time spent in the poll-loop */
a9c2dc43	330	struct NCR5380_hostdata *hostdata = shost_priv(instance);
1da177e4 LT	331
1da177e4 LT	332	i = 0;
22f5f10d	333	if (instance->irq == NO_IRQ)
1da177e4 LT	334	NCR5380_write(DTC_CONTROL_REG, CSR_DIR_READ);
	335	else
	336	NCR5380_write(DTC_CONTROL_REG, CSR_DIR_READ \| CSR_INT_BASE);
	337	NCR5380_write(DTC_BLK_CNT, len >> 7); /* Block count */
	338	rtrc(1);
	339	while (len > 0) {
	340	rtrc(2);
	341	while (NCR5380_read(DTC_CONTROL_REG) & CSR_HOST_BUF_NOT_RDY)
	342	++i;
	343	rtrc(3);
54d8fe44	344	memcpy_fromio(d, hostdata->base + DTC_DATA_BUF, 128);
1da177e4 LT	345	d += 128;
	346	len -= 128;
	347	rtrc(7);
	348	/*** with int's on, it sometimes hangs after here.
	349	* Looks like something makes HBNR go away. */
	350	}
	351	rtrc(4);
	352	while (!(NCR5380_read(DTC_CONTROL_REG) & D_CR_ACCESS))
	353	++i;
1da177e4	354	rtrc(0);
1da177e4 LT	355	return (0);
	356	}
	357
	358	/****************************************************************
	359	* Function : int NCR5380_pwrite (struct Scsi_Host *instance,
	360	* unsigned char *src, int len)
	361	*
	362	* Purpose : Fast 5380 pseudo-dma write function, transfers len bytes from
	363	* src
	364	*
	365	* Inputs : src = source, len = length in bytes
	366	*
	367	* Returns : 0 on success, non zero on a failure such as a watchdog
	368	* timeout.
	369	*/
	370
6c4b88ca FT	371	static inline int dtc_pwrite(struct Scsi_Host *instance,
6c4b88ca FT	372	unsigned char *src, int len)
1da177e4 LT	373	{
1da177e4 LT	374	int i;
a9c2dc43	375	struct NCR5380_hostdata *hostdata = shost_priv(instance);
1da177e4	376
22f5f10d	377	if (instance->irq == NO_IRQ)
1da177e4 LT	378	NCR5380_write(DTC_CONTROL_REG, 0);
	379	else
	380	NCR5380_write(DTC_CONTROL_REG, CSR_5380_INTR);
	381	NCR5380_write(DTC_BLK_CNT, len >> 7); /* Block count */
	382	for (i = 0; len > 0; ++i) {
	383	rtrc(5);
	384	/* Poll until the host buffer can accept data. */
	385	while (NCR5380_read(DTC_CONTROL_REG) & CSR_HOST_BUF_NOT_RDY)
	386	++i;
	387	rtrc(3);
54d8fe44	388	memcpy_toio(hostdata->base + DTC_DATA_BUF, src, 128);
1da177e4 LT	389	src += 128;
	390	len -= 128;
	391	}
	392	rtrc(4);
	393	while (!(NCR5380_read(DTC_CONTROL_REG) & D_CR_ACCESS))
	394	++i;
	395	rtrc(6);
	396	/* Wait until the last byte has been sent to the disk */
	397	while (!(NCR5380_read(TARGET_COMMAND_REG) & TCR_LAST_BYTE_SENT))
	398	++i;
	399	rtrc(7);
	400	/* Check for parity error here. fixme. */
1da177e4	401	rtrc(0);
1da177e4 LT	402	return (0);
	403	}
	404
ff3d4578 FT	405	static int dtc_dma_xfer_len(struct scsi_cmnd *cmd)
	406	{
	407	int transfersize = cmd->transfersize;
	408
	409	/* Limit transfers to 32K, for xx400 & xx406
	410	* pseudoDMA that transfers in 128 bytes blocks.
	411	*/
	412	if (transfersize > 32 * 1024 && cmd->SCp.this_residual &&
	413	!(cmd->SCp.this_residual % transfersize))
	414	transfersize = 32 * 1024;
	415
	416	return transfersize;
	417	}
	418
1da177e4 LT	419	MODULE_LICENSE("GPL");
	420
	421	#include "NCR5380.c"
	422
	423	static int dtc_release(struct Scsi_Host *shost)
	424	{
54d8fe44 FT	425	struct NCR5380_hostdata *hostdata = shost_priv(shost);
54d8fe44 FT	426
22f5f10d	427	if (shost->irq != NO_IRQ)
1e641664	428	free_irq(shost->irq, shost);
1da177e4	429	NCR5380_exit(shost);
1da177e4	430	scsi_unregister(shost);
54d8fe44	431	iounmap(hostdata->base);
1da177e4 LT	432	return 0;
	433	}
	434
d0be4a7d	435	static struct scsi_host_template driver_template = {
aa2e2cb1 FT	436	.name = "DTC 3180/3280",
	437	.detect = dtc_detect,
	438	.release = dtc_release,
	439	.proc_name = "dtc3x80",
aa2e2cb1 FT	440	.info = dtc_info,
	441	.queuecommand = dtc_queue_command,
	442	.eh_abort_handler = dtc_abort,
	443	.eh_bus_reset_handler = dtc_bus_reset,
	444	.bios_param = dtc_biosparam,
	445	.can_queue = 32,
	446	.this_id = 7,
	447	.sg_tablesize = SG_ALL,
	448	.cmd_per_lun = 2,
	449	.use_clustering = DISABLE_CLUSTERING,
32b26a10	450	.cmd_size = NCR5380_CMD_SIZE,
0a4e3612	451	.max_sectors = 128,
1da177e4 LT	452	};
1da177e4 LT	453	#include "scsi_module.c"