[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
 */

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