5 #define UNSAFE /* Leave interrupts enabled during pseudo-dma I/O */
6 #define xNDEBUG (NDEBUG_INTR+NDEBUG_RESELECTION+\
7 NDEBUG_SELECTION+NDEBUG_ARBITRATION)
8 #define DMA_WORKS_RIGHT
12 * DTC 3180/3280 driver, by
13 * Ray Van Tassle rayvt@comm.mot.com
16 * Trantor T128/T128F/T228 driver by...
20 * (Unix and Linux consulting and custom programming)
24 * DISTRIBUTION RELEASE 1.
26 * For more information, please consult
29 * SCSI Protocol Controller
35 * AUTOSENSE - if defined, REQUEST SENSE will be performed automatically
36 * for commands that return with a CHECK CONDITION status.
38 * PSEUDO_DMA - enables PSEUDO-DMA hardware, should give a 3-4X performance
39 * increase compared to polled I/O.
41 * PARITY - enable parity checking. Not supported.
43 * UNSAFE - leave interrupts enabled during pseudo-DMA transfers.
44 * You probably want this.
46 * The card is detected and initialized in one of several ways :
47 * 1. Autoprobe (default) - since the board is memory mapped,
48 * a BIOS signature is scanned for to locate the registers.
49 * An interrupt is triggered to autoprobe for the interrupt
52 * 2. With command line overrides - dtc=address,irq may be
53 * used on the LILO command line to override the defaults.
57 /*----------------------------------------------------------------*/
58 /* the following will set the monitor border color (useful to find
59 where something crashed or gets stuck at */
69 #define rtrc(i) {inb(0x3da); outb(0x31, 0x3c0); outb((i), 0x3c0);}
75 #include <asm/system.h>
76 #include <linux/module.h>
77 #include <linux/signal.h>
78 #include <linux/sched.h>
79 #include <linux/blkdev.h>
80 #include <linux/delay.h>
81 #include <linux/stat.h>
82 #include <linux/string.h>
83 #include <linux/init.h>
84 #include <linux/interrupt.h>
87 #include <scsi/scsi_host.h>
93 #define DTC_PUBLIC_RELEASE 2
95 /*#define DTCDEBUG 0x1*/
96 #define DTCDEBUG_INIT 0x1
97 #define DTCDEBUG_TRANSFER 0x2
100 * The DTC3180 & 3280 boards are memory mapped.
106 /* Offset from DTC_5380_OFFSET */
107 #define DTC_CONTROL_REG 0x100 /* rw */
108 #define D_CR_ACCESS 0x80 /* ro set=can access 3280 registers */
109 #define CSR_DIR_READ 0x40 /* rw direction, 1 = read 0 = write */
111 #define CSR_RESET 0x80 /* wo Resets 53c400 */
112 #define CSR_5380_REG 0x80 /* ro 5380 registers can be accessed */
113 #define CSR_TRANS_DIR 0x40 /* rw Data transfer direction */
114 #define CSR_SCSI_BUFF_INTR 0x20 /* rw Enable int on transfer ready */
115 #define CSR_5380_INTR 0x10 /* rw Enable 5380 interrupts */
116 #define CSR_SHARED_INTR 0x08 /* rw Interrupt sharing */
117 #define CSR_HOST_BUF_NOT_RDY 0x04 /* ro Host buffer not ready */
118 #define CSR_SCSI_BUF_RDY 0x02 /* ro SCSI buffer ready */
119 #define CSR_GATED_5380_IRQ 0x01 /* ro Last block xferred */
120 #define CSR_INT_BASE (CSR_SCSI_BUFF_INTR | CSR_5380_INTR)
123 #define DTC_BLK_CNT 0x101 /* rw
124 * # of 128-byte blocks to transfer */
127 #define D_CR_ACCESS 0x80 /* ro set=can access 3280 registers */
129 #define DTC_SWITCH_REG 0x3982 /* ro - DIP switches */
130 #define DTC_RESUME_XFER 0x3982 /* wo - resume data xfer
131 * after disconnect/reconnect*/
133 #define DTC_5380_OFFSET 0x3880 /* 8 registers here, see NCR5380.h */
135 /*!!!! for dtc, it's a 128 byte buffer at 3900 !!! */
136 #define DTC_DATA_BUF 0x3900 /* rw 128 bytes long */
138 static struct override
{
139 unsigned int address
;
143 [] __initdata
= OVERRIDE
;
152 #define NO_OVERRIDES (sizeof(overrides) / sizeof(struct override))
155 unsigned long address
;
157 } bases
[] __initdata
= {
164 #define NO_BASES (sizeof (bases) / sizeof (struct base))
166 static const struct signature
{
170 {"DATA TECHNOLOGY CORPORATION BIOS", 0x25},
173 #define NO_SIGNATURES (sizeof (signatures) / sizeof (struct signature))
177 * Function : dtc_setup(char *str, int *ints)
179 * Purpose : LILO command line initialization of the overrides array,
181 * Inputs : str - unused, ints - array of integer parameters with ints[0]
182 * equal to the number of ints.
186 static void __init
dtc_setup(char *str
, int *ints
)
188 static int commandline_current
= 0;
191 printk("dtc_setup: usage dtc=address,irq\n");
192 else if (commandline_current
< NO_OVERRIDES
) {
193 overrides
[commandline_current
].address
= ints
[1];
194 overrides
[commandline_current
].irq
= ints
[2];
195 for (i
= 0; i
< NO_BASES
; ++i
)
196 if (bases
[i
].address
== ints
[1]) {
200 ++commandline_current
;
206 * Function : int dtc_detect(Scsi_Host_Template * tpnt)
208 * Purpose : detects and initializes DTC 3180/3280 controllers
209 * that were autoprobed, overridden on the LILO command line,
210 * or specified at compile time.
212 * Inputs : tpnt - template for this SCSI adapter.
214 * Returns : 1 if a host adapter was found, 0 if not.
218 static int __init
dtc_detect(Scsi_Host_Template
* tpnt
)
220 static int current_override
= 0, current_base
= 0;
221 struct Scsi_Host
*instance
;
225 tpnt
->proc_name
= "dtc3x80";
226 tpnt
->proc_info
= &dtc_proc_info
;
228 for (count
= 0; current_override
< NO_OVERRIDES
; ++current_override
) {
231 if (overrides
[current_override
].address
)
232 base
= overrides
[current_override
].address
;
234 for (; !base
&& (current_base
< NO_BASES
); ++current_base
) {
235 #if (DTCDEBUG & DTCDEBUG_INIT)
236 printk("scsi-dtc : probing address %08x\n", bases
[current_base
].address
);
238 for (sig
= 0; sig
< NO_SIGNATURES
; ++sig
)
239 if (!bases
[current_base
].noauto
&& isa_check_signature(bases
[current_base
].address
+ signatures
[sig
].offset
, signatures
[sig
].string
, strlen(signatures
[sig
].string
))) {
240 base
= bases
[current_base
].address
;
241 #if (DTCDEBUG & DTCDEBUG_INIT)
242 printk("scsi-dtc : detected board.\n");
248 #if defined(DTCDEBUG) && (DTCDEBUG & DTCDEBUG_INIT)
249 printk("scsi-dtc : base = %08x\n", base
);
255 instance
= scsi_register(tpnt
, sizeof(struct NCR5380_hostdata
));
256 if (instance
== NULL
)
259 instance
->base
= base
;
261 NCR5380_init(instance
, 0);
263 NCR5380_write(DTC_CONTROL_REG
, CSR_5380_INTR
); /* Enable int's */
264 if (overrides
[current_override
].irq
!= IRQ_AUTO
)
265 instance
->irq
= overrides
[current_override
].irq
;
267 instance
->irq
= NCR5380_probe_irq(instance
, DTC_IRQS
);
269 #ifndef DONT_USE_INTR
270 /* With interrupts enabled, it will sometimes hang when doing heavy
271 * reads. So better not enable them until I finger it out. */
272 if (instance
->irq
!= SCSI_IRQ_NONE
)
273 if (request_irq(instance
->irq
, dtc_intr
, SA_INTERRUPT
, "dtc", instance
)) {
274 printk(KERN_ERR
"scsi%d : IRQ%d not free, interrupts disabled\n", instance
->host_no
, instance
->irq
);
275 instance
->irq
= SCSI_IRQ_NONE
;
278 if (instance
->irq
== SCSI_IRQ_NONE
) {
279 printk(KERN_WARNING
"scsi%d : interrupts not enabled. for better interactive performance,\n", instance
->host_no
);
280 printk(KERN_WARNING
"scsi%d : please jumper the board for a free IRQ.\n", instance
->host_no
);
283 if (instance
->irq
!= SCSI_IRQ_NONE
)
284 printk(KERN_WARNING
"scsi%d : interrupts not used. Might as well not jumper it.\n", instance
->host_no
);
285 instance
->irq
= SCSI_IRQ_NONE
;
287 #if defined(DTCDEBUG) && (DTCDEBUG & DTCDEBUG_INIT)
288 printk("scsi%d : irq = %d\n", instance
->host_no
, instance
->irq
);
291 printk(KERN_INFO
"scsi%d : at 0x%05X", instance
->host_no
, (int) instance
->base
);
292 if (instance
->irq
== SCSI_IRQ_NONE
)
293 printk(" interrupts disabled");
295 printk(" irq %d", instance
->irq
);
296 printk(" options CAN_QUEUE=%d CMD_PER_LUN=%d release=%d", CAN_QUEUE
, CMD_PER_LUN
, DTC_PUBLIC_RELEASE
);
297 NCR5380_print_options(instance
);
307 * Function : int dtc_biosparam(Disk * disk, struct block_device *dev, int *ip)
309 * Purpose : Generates a BIOS / DOS compatible H-C-S mapping for
310 * the specified device / size.
312 * Inputs : size = size of device in sectors (512 bytes), dev = block device
313 * major / minor, ip[] = {heads, sectors, cylinders}
315 * Returns : always 0 (success), initializes ip
320 * XXX Most SCSI boards use this mapping, I could be incorrect. Some one
321 * using hard disks on a trantor should verify that this mapping corresponds
322 * to that used by the BIOS / ASPI driver by running the linux fdisk program
323 * and matching the H_C_S coordinates to what DOS uses.
326 static int dtc_biosparam(struct scsi_device
*sdev
, struct block_device
*dev
,
327 sector_t capacity
, int *ip
)
338 /****************************************************************
339 * Function : int NCR5380_pread (struct Scsi_Host *instance,
340 * unsigned char *dst, int len)
342 * Purpose : Fast 5380 pseudo-dma read function, reads len bytes to
345 * Inputs : dst = destination, len = length in bytes
347 * Returns : 0 on success, non zero on a failure such as a watchdog
351 static int dtc_maxi
= 0;
352 static int dtc_wmaxi
= 0;
354 static inline int NCR5380_pread(struct Scsi_Host
*instance
, unsigned char *dst
, int len
)
356 unsigned char *d
= dst
;
357 int i
; /* For counting time spent in the poll-loop */
358 NCR5380_local_declare();
359 NCR5380_setup(instance
);
362 NCR5380_read(RESET_PARITY_INTERRUPT_REG
);
363 NCR5380_write(MODE_REG
, MR_ENABLE_EOP_INTR
| MR_DMA_MODE
);
364 if (instance
->irq
== SCSI_IRQ_NONE
)
365 NCR5380_write(DTC_CONTROL_REG
, CSR_DIR_READ
);
367 NCR5380_write(DTC_CONTROL_REG
, CSR_DIR_READ
| CSR_INT_BASE
);
368 NCR5380_write(DTC_BLK_CNT
, len
>> 7); /* Block count */
372 while (NCR5380_read(DTC_CONTROL_REG
) & CSR_HOST_BUF_NOT_RDY
)
375 isa_memcpy_fromio(d
, base
+ DTC_DATA_BUF
, 128);
379 /*** with int's on, it sometimes hangs after here.
380 * Looks like something makes HBNR go away. */
383 while (!(NCR5380_read(DTC_CONTROL_REG
) & D_CR_ACCESS
))
385 NCR5380_write(MODE_REG
, 0); /* Clear the operating mode */
387 NCR5380_read(RESET_PARITY_INTERRUPT_REG
);
393 /****************************************************************
394 * Function : int NCR5380_pwrite (struct Scsi_Host *instance,
395 * unsigned char *src, int len)
397 * Purpose : Fast 5380 pseudo-dma write function, transfers len bytes from
400 * Inputs : src = source, len = length in bytes
402 * Returns : 0 on success, non zero on a failure such as a watchdog
406 static inline int NCR5380_pwrite(struct Scsi_Host
*instance
, unsigned char *src
, int len
)
409 NCR5380_local_declare();
410 NCR5380_setup(instance
);
412 NCR5380_read(RESET_PARITY_INTERRUPT_REG
);
413 NCR5380_write(MODE_REG
, MR_ENABLE_EOP_INTR
| MR_DMA_MODE
);
414 /* set direction (write) */
415 if (instance
->irq
== SCSI_IRQ_NONE
)
416 NCR5380_write(DTC_CONTROL_REG
, 0);
418 NCR5380_write(DTC_CONTROL_REG
, CSR_5380_INTR
);
419 NCR5380_write(DTC_BLK_CNT
, len
>> 7); /* Block count */
420 for (i
= 0; len
> 0; ++i
) {
422 /* Poll until the host buffer can accept data. */
423 while (NCR5380_read(DTC_CONTROL_REG
) & CSR_HOST_BUF_NOT_RDY
)
426 isa_memcpy_toio(base
+ DTC_DATA_BUF
, src
, 128);
431 while (!(NCR5380_read(DTC_CONTROL_REG
) & D_CR_ACCESS
))
434 /* Wait until the last byte has been sent to the disk */
435 while (!(NCR5380_read(TARGET_COMMAND_REG
) & TCR_LAST_BYTE_SENT
))
438 /* Check for parity error here. fixme. */
439 NCR5380_write(MODE_REG
, 0); /* Clear the operating mode */
446 MODULE_LICENSE("GPL");
450 static int dtc_release(struct Scsi_Host
*shost
)
453 free_irq(shost
->irq
, NULL
);
455 if (shost
->io_port
&& shost
->n_io_port
)
456 release_region(shost
->io_port
, shost
->n_io_port
);
457 scsi_unregister(shost
);
461 static Scsi_Host_Template driver_template
= {
462 .name
= "DTC 3180/3280 ",
463 .detect
= dtc_detect
,
464 .release
= dtc_release
,
465 .queuecommand
= dtc_queue_command
,
466 .eh_abort_handler
= dtc_abort
,
467 .eh_bus_reset_handler
= dtc_bus_reset
,
468 .eh_device_reset_handler
= dtc_device_reset
,
469 .eh_host_reset_handler
= dtc_host_reset
,
470 .bios_param
= dtc_biosparam
,
471 .can_queue
= CAN_QUEUE
,
473 .sg_tablesize
= SG_ALL
,
474 .cmd_per_lun
= CMD_PER_LUN
,
475 .use_clustering
= DISABLE_CLUSTERING
,
477 #include "scsi_module.c"