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

#define PSEUDO_DMA
#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, FLAG_NO_DMA_FIXUP))
			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 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);

	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);
	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);

	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);
	if (i > hostdata->spin_max_w)
		hostdata->spin_max_w = i;
	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",
	.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		= 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 LT	1	#define PSEUDO_DMA
1da177e4 LT	2	#define DONT_USE_INTR
1da177e4 LT	3
	4	/*
	5	* DTC 3180/3280 driver, by
	6	* Ray Van Tassle rayvt@comm.mot.com
	7	*
	8	* taken from ...
	9	* Trantor T128/T128F/T228 driver by...
	10	*
	11	* Drew Eckhardt
	12	* Visionary Computing
	13	* (Unix and Linux consulting and custom programming)
	14	* drew@colorado.edu
	15	* +1 (303) 440-4894
3f9e986e	16	*/
1da177e4 LT	17
1da177e4 LT	18	/*
1da177e4 LT	19	* The card is detected and initialized in one of several ways :
	20	* 1. Autoprobe (default) - since the board is memory mapped,
	21	* a BIOS signature is scanned for to locate the registers.
	22	* An interrupt is triggered to autoprobe for the interrupt
	23	* line.
	24	*
	25	* 2. With command line overrides - dtc=address,irq may be
	26	* used on the LILO command line to override the defaults.
	27	*
	28	*/
	29
	30	/----------------------------------------------------------------/
	31	/* the following will set the monitor border color (useful to find
	32	where something crashed or gets stuck at */
	33	/* 1 = blue
	34	2 = green
	35	3 = cyan
	36	4 = red
	37	5 = magenta
	38	6 = yellow
	39	7 = white
	40	*/
	41	#if 0
	42	#define rtrc(i) {inb(0x3da); outb(0x31, 0x3c0); outb((i), 0x3c0);}
	43	#else
	44	#define rtrc(i) {}
	45	#endif
	46
	47
1da177e4	48	#include <linux/module.h>
1da177e4	49	#include <linux/blkdev.h>
1da177e4 LT	50	#include <linux/string.h>
	51	#include <linux/init.h>
	52	#include <linux/interrupt.h>
53d5ed62	53	#include <linux/io.h>
1da177e4	54	#include <scsi/scsi_host.h>
161c0059	55
1da177e4 LT	56	#include "dtc.h"
	57	#define AUTOPROBE_IRQ
	58	#include "NCR5380.h"
	59
1da177e4 LT	60	/*
	61	* The DTC3180 & 3280 boards are memory mapped.
	62	*
	63	*/
	64
	65	/*
	66	*/
	67	/* Offset from DTC_5380_OFFSET */
	68	#define DTC_CONTROL_REG 0x100 /* rw */
	69	#define D_CR_ACCESS 0x80 /* ro set=can access 3280 registers */
	70	#define CSR_DIR_READ 0x40 /* rw direction, 1 = read 0 = write */
	71
	72	#define CSR_RESET 0x80 /* wo Resets 53c400 */
	73	#define CSR_5380_REG 0x80 /* ro 5380 registers can be accessed */
	74	#define CSR_TRANS_DIR 0x40 /* rw Data transfer direction */
	75	#define CSR_SCSI_BUFF_INTR 0x20 /* rw Enable int on transfer ready */
	76	#define CSR_5380_INTR 0x10 /* rw Enable 5380 interrupts */
	77	#define CSR_SHARED_INTR 0x08 /* rw Interrupt sharing */
	78	#define CSR_HOST_BUF_NOT_RDY 0x04 /* ro Host buffer not ready */
	79	#define CSR_SCSI_BUF_RDY 0x02 /* ro SCSI buffer ready */
	80	#define CSR_GATED_5380_IRQ 0x01 /* ro Last block xferred */
	81	#define CSR_INT_BASE (CSR_SCSI_BUFF_INTR \| CSR_5380_INTR)
	82
	83
	84	#define DTC_BLK_CNT 0x101 /* rw
	85	* # of 128-byte blocks to transfer */
	86
	87
	88	#define D_CR_ACCESS 0x80 /* ro set=can access 3280 registers */
	89
	90	#define DTC_SWITCH_REG 0x3982 /* ro - DIP switches */
	91	#define DTC_RESUME_XFER 0x3982 /* wo - resume data xfer
	92	* after disconnect/reconnect*/
	93
	94	#define DTC_5380_OFFSET 0x3880 /* 8 registers here, see NCR5380.h */
	95
	96	/!!!! for dtc, it's a 128 byte buffer at 3900 !!! /
	97	#define DTC_DATA_BUF 0x3900 /* rw 128 bytes long */
	98
	99	static struct override {
	100	unsigned int address;
	101	int irq;
	102	} overrides
	103	#ifdef OVERRIDE
	104	[] __initdata = OVERRIDE;
	105	#else
1fbe8529 AC	106	[4] __initdata = {
	107	{ 0, IRQ_AUTO }, { 0, IRQ_AUTO }, { 0, IRQ_AUTO }, { 0, IRQ_AUTO }
	108	};
1da177e4 LT	109	#endif
1da177e4 LT	110
6391a113	111	#define NO_OVERRIDES ARRAY_SIZE(overrides)
1da177e4 LT	112
	113	static struct base {
	114	unsigned long address;
	115	int noauto;
6391a113 TK	116	} bases[] __initdata = {
	117	{ 0xcc000, 0 },
	118	{ 0xc8000, 0 },
	119	{ 0xdc000, 0 },
1da177e4 LT	120	{ 0xd8000, 0 }
	121	};
	122
6391a113	123	#define NO_BASES ARRAY_SIZE(bases)
1da177e4 LT	124
	125	static const struct signature {
	126	const char *string;
	127	int offset;
6391a113	128	} signatures[] = {
1da177e4 LT	129	{"DATA TECHNOLOGY CORPORATION BIOS", 0x25},
	130	};
	131
6391a113	132	#define NO_SIGNATURES ARRAY_SIZE(signatures)
1da177e4 LT	133
	134	#ifndef MODULE
	135	/*
	136	* Function : dtc_setup(char str, int ints)
	137	*
	138	* Purpose : LILO command line initialization of the overrides array,
6391a113	139	*
1da177e4 LT	140	* Inputs : str - unused, ints - array of integer parameters with ints[0]
	141	* equal to the number of ints.
	142	*
1fbe8529	143	*/
1da177e4	144
925e4610	145	static int __init dtc_setup(char *str)
1da177e4	146	{
d5f7e65d	147	static int commandline_current;
1da177e4	148	int i;
925e4610 FT	149	int ints[10];
	150
	151	get_options(str, ARRAY_SIZE(ints), ints);
1da177e4 LT	152	if (ints[0] != 2)
	153	printk("dtc_setup: usage dtc=address,irq\n");
	154	else if (commandline_current < NO_OVERRIDES) {
	155	overrides[commandline_current].address = ints[1];
	156	overrides[commandline_current].irq = ints[2];
	157	for (i = 0; i < NO_BASES; ++i)
	158	if (bases[i].address == ints[1]) {
	159	bases[i].noauto = 1;
	160	break;
	161	}
	162	++commandline_current;
	163	}
925e4610	164	return 1;
1da177e4	165	}
925e4610 FT	166
925e4610 FT	167	__setup("dtc=", dtc_setup);
1da177e4 LT	168	#endif
	169
	170	/*
d0be4a7d	171	* Function : int dtc_detect(struct scsi_host_template * tpnt)
1da177e4 LT	172	*
	173	* Purpose : detects and initializes DTC 3180/3280 controllers
	174	* that were autoprobed, overridden on the LILO command line,
	175	* or specified at compile time.
	176	*
	177	* Inputs : tpnt - template for this SCSI adapter.
	178	*
	179	* Returns : 1 if a host adapter was found, 0 if not.
	180	*
	181	*/
	182
d0be4a7d	183	static int __init dtc_detect(struct scsi_host_template * tpnt)
1da177e4	184	{
d5f7e65d	185	static int current_override, current_base;
1da177e4 LT	186	struct Scsi_Host *instance;
	187	unsigned int addr;
	188	void __iomem *base;
	189	int sig, count;
	190
1da177e4 LT	191	for (count = 0; current_override < NO_OVERRIDES; ++current_override) {
	192	addr = 0;
	193	base = NULL;
	194
	195	if (overrides[current_override].address) {
	196	addr = overrides[current_override].address;
	197	base = ioremap(addr, 0x2000);
	198	if (!base)
	199	addr = 0;
	200	} else
	201	for (; !addr && (current_base < NO_BASES); ++current_base) {
2f7dba9f FT	202	dprintk(NDEBUG_INIT, "dtc: probing address 0x%08x\n",
2f7dba9f FT	203	(unsigned int)bases[current_base].address);
1da177e4 LT	204	if (bases[current_base].noauto)
	205	continue;
	206	base = ioremap(bases[current_base].address, 0x2000);
	207	if (!base)
	208	continue;
	209	for (sig = 0; sig < NO_SIGNATURES; ++sig) {
	210	if (check_signature(base + signatures[sig].offset, signatures[sig].string, strlen(signatures[sig].string))) {
	211	addr = bases[current_base].address;
2f7dba9f	212	dprintk(NDEBUG_INIT, "dtc: detected board\n");
1da177e4 LT	213	goto found;
	214	}
	215	}
	216	iounmap(base);
	217	}
	218
2f7dba9f	219	dprintk(NDEBUG_INIT, "dtc: addr = 0x%08x\n", addr);
1da177e4 LT	220
	221	if (!addr)
	222	break;
	223
	224	found:
	225	instance = scsi_register(tpnt, sizeof(struct NCR5380_hostdata));
	226	if (instance == NULL)
0ad0eff9	227	goto out_unmap;
1da177e4 LT	228
	229	instance->base = addr;
	230	((struct NCR5380_hostdata *)(instance)->hostdata)->base = base;
	231
55181be8	232	if (NCR5380_init(instance, FLAG_NO_DMA_FIXUP))
0ad0eff9	233	goto out_unregister;
1da177e4	234
b6488f97 FT	235	NCR5380_maybe_reset_bus(instance);
b6488f97 FT	236
1da177e4 LT	237	NCR5380_write(DTC_CONTROL_REG, CSR_5380_INTR); /* Enable int's */
	238	if (overrides[current_override].irq != IRQ_AUTO)
	239	instance->irq = overrides[current_override].irq;
	240	else
	241	instance->irq = NCR5380_probe_irq(instance, DTC_IRQS);
	242
22f5f10d FT	243	/* Compatibility with documented NCR5380 kernel parameters */
	244	if (instance->irq == 255)
	245	instance->irq = NO_IRQ;
	246
1da177e4 LT	247	#ifndef DONT_USE_INTR
	248	/* With interrupts enabled, it will sometimes hang when doing heavy
	249	* reads. So better not enable them until I finger it out. */
22f5f10d	250	if (instance->irq != NO_IRQ)
4909cc2b	251	if (request_irq(instance->irq, dtc_intr, 0,
1e641664	252	"dtc", instance)) {
1da177e4	253	printk(KERN_ERR "scsi%d : IRQ%d not free, interrupts disabled\n", instance->host_no, instance->irq);
22f5f10d	254	instance->irq = NO_IRQ;
1da177e4 LT	255	}
1da177e4 LT	256
22f5f10d	257	if (instance->irq == NO_IRQ) {
1da177e4 LT	258	printk(KERN_WARNING "scsi%d : interrupts not enabled. for better interactive performance,\n", instance->host_no);
	259	printk(KERN_WARNING "scsi%d : please jumper the board for a free IRQ.\n", instance->host_no);
	260	}
	261	#else
22f5f10d	262	if (instance->irq != NO_IRQ)
1da177e4	263	printk(KERN_WARNING "scsi%d : interrupts not used. Might as well not jumper it.\n", instance->host_no);
22f5f10d	264	instance->irq = NO_IRQ;
1da177e4	265	#endif
2f7dba9f FT	266	dprintk(NDEBUG_INIT, "scsi%d : irq = %d\n",
2f7dba9f FT	267	instance->host_no, instance->irq);
1da177e4	268
1da177e4 LT	269	++current_override;
	270	++count;
	271	}
	272	return count;
0ad0eff9 FT	273
	274	out_unregister:
	275	scsi_unregister(instance);
	276	out_unmap:
	277	iounmap(base);
	278	return count;
1da177e4 LT	279	}
	280
	281	/*
	282	* Function : int dtc_biosparam(Disk * disk, struct block_device dev, int ip)
	283	*
	284	* Purpose : Generates a BIOS / DOS compatible H-C-S mapping for
	285	* the specified device / size.
	286	*
	287	* Inputs : size = size of device in sectors (512 bytes), dev = block device
	288	* major / minor, ip[] = {heads, sectors, cylinders}
	289	*
	290	* Returns : always 0 (success), initializes ip
	291	*
	292	*/
	293
	294	/*
	295	* XXX Most SCSI boards use this mapping, I could be incorrect. Some one
	296	* using hard disks on a trantor should verify that this mapping corresponds
	297	* to that used by the BIOS / ASPI driver by running the linux fdisk program
	298	* and matching the H_C_S coordinates to what DOS uses.
	299	*/
	300
	301	static int dtc_biosparam(struct scsi_device sdev, struct block_device dev,
	302	sector_t capacity, int *ip)
	303	{
	304	int size = capacity;
	305
	306	ip[0] = 64;
	307	ip[1] = 32;
	308	ip[2] = size >> 11;
	309	return 0;
	310	}
	311
	312
	313	/****************************************************************
	314	* Function : int NCR5380_pread (struct Scsi_Host *instance,
	315	* unsigned char *dst, int len)
	316	*
	317	* Purpose : Fast 5380 pseudo-dma read function, reads len bytes to
	318	* dst
	319	*
	320	* Inputs : dst = destination, len = length in bytes
	321	*
	322	* Returns : 0 on success, non zero on a failure such as a watchdog
	323	* timeout.
	324	*/
	325
1da177e4 LT	326	static inline int NCR5380_pread(struct Scsi_Host instance, unsigned char dst, int len)
	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);
a9c2dc43 FT	355	if (i > hostdata->spin_max_r)
a9c2dc43 FT	356	hostdata->spin_max_r = i;
1da177e4 LT	357	return (0);
	358	}
	359
	360	/****************************************************************
	361	* Function : int NCR5380_pwrite (struct Scsi_Host *instance,
	362	* unsigned char *src, int len)
	363	*
	364	* Purpose : Fast 5380 pseudo-dma write function, transfers len bytes from
	365	* src
	366	*
	367	* Inputs : src = source, len = length in bytes
	368	*
	369	* Returns : 0 on success, non zero on a failure such as a watchdog
	370	* timeout.
	371	*/
	372
	373	static inline int NCR5380_pwrite(struct Scsi_Host instance, unsigned char src, int len)
	374	{
	375	int i;
a9c2dc43	376	struct NCR5380_hostdata *hostdata = shost_priv(instance);
1da177e4	377
22f5f10d	378	if (instance->irq == NO_IRQ)
1da177e4 LT	379	NCR5380_write(DTC_CONTROL_REG, 0);
	380	else
	381	NCR5380_write(DTC_CONTROL_REG, CSR_5380_INTR);
	382	NCR5380_write(DTC_BLK_CNT, len >> 7); /* Block count */
	383	for (i = 0; len > 0; ++i) {
	384	rtrc(5);
	385	/* Poll until the host buffer can accept data. */
	386	while (NCR5380_read(DTC_CONTROL_REG) & CSR_HOST_BUF_NOT_RDY)
	387	++i;
	388	rtrc(3);
54d8fe44	389	memcpy_toio(hostdata->base + DTC_DATA_BUF, src, 128);
1da177e4 LT	390	src += 128;
	391	len -= 128;
	392	}
	393	rtrc(4);
	394	while (!(NCR5380_read(DTC_CONTROL_REG) & D_CR_ACCESS))
	395	++i;
	396	rtrc(6);
	397	/* Wait until the last byte has been sent to the disk */
	398	while (!(NCR5380_read(TARGET_COMMAND_REG) & TCR_LAST_BYTE_SENT))
	399	++i;
	400	rtrc(7);
	401	/* Check for parity error here. fixme. */
1da177e4	402	rtrc(0);
a9c2dc43 FT	403	if (i > hostdata->spin_max_w)
a9c2dc43 FT	404	hostdata->spin_max_w = i;
1da177e4 LT	405	return (0);
	406	}
	407
ff3d4578 FT	408	static int dtc_dma_xfer_len(struct scsi_cmnd *cmd)
	409	{
	410	int transfersize = cmd->transfersize;
	411
	412	/* Limit transfers to 32K, for xx400 & xx406
	413	* pseudoDMA that transfers in 128 bytes blocks.
	414	*/
	415	if (transfersize > 32 * 1024 && cmd->SCp.this_residual &&
	416	!(cmd->SCp.this_residual % transfersize))
	417	transfersize = 32 * 1024;
	418
	419	return transfersize;
	420	}
	421
1da177e4 LT	422	MODULE_LICENSE("GPL");
	423
	424	#include "NCR5380.c"
	425
	426	static int dtc_release(struct Scsi_Host *shost)
	427	{
54d8fe44 FT	428	struct NCR5380_hostdata *hostdata = shost_priv(shost);
54d8fe44 FT	429
22f5f10d	430	if (shost->irq != NO_IRQ)
1e641664	431	free_irq(shost->irq, shost);
1da177e4	432	NCR5380_exit(shost);
1da177e4	433	scsi_unregister(shost);
54d8fe44	434	iounmap(hostdata->base);
1da177e4 LT	435	return 0;
	436	}
	437
d0be4a7d	438	static struct scsi_host_template driver_template = {
aa2e2cb1 FT	439	.name = "DTC 3180/3280",
	440	.detect = dtc_detect,
	441	.release = dtc_release,
	442	.proc_name = "dtc3x80",
	443	.show_info = dtc_show_info,
	444	.write_info = dtc_write_info,
	445	.info = dtc_info,
	446	.queuecommand = dtc_queue_command,
	447	.eh_abort_handler = dtc_abort,
	448	.eh_bus_reset_handler = dtc_bus_reset,
	449	.bios_param = dtc_biosparam,
	450	.can_queue = 32,
	451	.this_id = 7,
	452	.sg_tablesize = SG_ALL,
	453	.cmd_per_lun = 2,
	454	.use_clustering = DISABLE_CLUSTERING,
32b26a10	455	.cmd_size = NCR5380_CMD_SIZE,
0a4e3612	456	.max_sectors = 128,
1da177e4 LT	457	};
1da177e4 LT	458	#include "scsi_module.c"