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/blkdev.h>
79 #include <linux/delay.h>
80 #include <linux/stat.h>
81 #include <linux/string.h>
82 #include <linux/init.h>
83 #include <linux/interrupt.h>
86 #include <scsi/scsi_host.h>
92 #define DTC_PUBLIC_RELEASE 2
95 * The DTC3180 & 3280 boards are memory mapped.
101 /* Offset from DTC_5380_OFFSET */
102 #define DTC_CONTROL_REG 0x100 /* rw */
103 #define D_CR_ACCESS 0x80 /* ro set=can access 3280 registers */
104 #define CSR_DIR_READ 0x40 /* rw direction, 1 = read 0 = write */
106 #define CSR_RESET 0x80 /* wo Resets 53c400 */
107 #define CSR_5380_REG 0x80 /* ro 5380 registers can be accessed */
108 #define CSR_TRANS_DIR 0x40 /* rw Data transfer direction */
109 #define CSR_SCSI_BUFF_INTR 0x20 /* rw Enable int on transfer ready */
110 #define CSR_5380_INTR 0x10 /* rw Enable 5380 interrupts */
111 #define CSR_SHARED_INTR 0x08 /* rw Interrupt sharing */
112 #define CSR_HOST_BUF_NOT_RDY 0x04 /* ro Host buffer not ready */
113 #define CSR_SCSI_BUF_RDY 0x02 /* ro SCSI buffer ready */
114 #define CSR_GATED_5380_IRQ 0x01 /* ro Last block xferred */
115 #define CSR_INT_BASE (CSR_SCSI_BUFF_INTR | CSR_5380_INTR)
118 #define DTC_BLK_CNT 0x101 /* rw
119 * # of 128-byte blocks to transfer */
122 #define D_CR_ACCESS 0x80 /* ro set=can access 3280 registers */
124 #define DTC_SWITCH_REG 0x3982 /* ro - DIP switches */
125 #define DTC_RESUME_XFER 0x3982 /* wo - resume data xfer
126 * after disconnect/reconnect*/
128 #define DTC_5380_OFFSET 0x3880 /* 8 registers here, see NCR5380.h */
130 /*!!!! for dtc, it's a 128 byte buffer at 3900 !!! */
131 #define DTC_DATA_BUF 0x3900 /* rw 128 bytes long */
133 static struct override
{
134 unsigned int address
;
138 [] __initdata
= OVERRIDE
;
141 { 0, IRQ_AUTO
}, { 0, IRQ_AUTO
}, { 0, IRQ_AUTO
}, { 0, IRQ_AUTO
}
145 #define NO_OVERRIDES ARRAY_SIZE(overrides)
148 unsigned long address
;
150 } bases
[] __initdata
= {
157 #define NO_BASES ARRAY_SIZE(bases)
159 static const struct signature
{
163 {"DATA TECHNOLOGY CORPORATION BIOS", 0x25},
166 #define NO_SIGNATURES ARRAY_SIZE(signatures)
170 * Function : dtc_setup(char *str, int *ints)
172 * Purpose : LILO command line initialization of the overrides array,
174 * Inputs : str - unused, ints - array of integer parameters with ints[0]
175 * equal to the number of ints.
179 static void __init
dtc_setup(char *str
, int *ints
)
181 static int commandline_current
= 0;
184 printk("dtc_setup: usage dtc=address,irq\n");
185 else if (commandline_current
< NO_OVERRIDES
) {
186 overrides
[commandline_current
].address
= ints
[1];
187 overrides
[commandline_current
].irq
= ints
[2];
188 for (i
= 0; i
< NO_BASES
; ++i
)
189 if (bases
[i
].address
== ints
[1]) {
193 ++commandline_current
;
199 * Function : int dtc_detect(struct scsi_host_template * tpnt)
201 * Purpose : detects and initializes DTC 3180/3280 controllers
202 * that were autoprobed, overridden on the LILO command line,
203 * or specified at compile time.
205 * Inputs : tpnt - template for this SCSI adapter.
207 * Returns : 1 if a host adapter was found, 0 if not.
211 static int __init
dtc_detect(struct scsi_host_template
* tpnt
)
213 static int current_override
= 0, current_base
= 0;
214 struct Scsi_Host
*instance
;
219 tpnt
->proc_name
= "dtc3x80";
220 tpnt
->proc_info
= &dtc_proc_info
;
222 for (count
= 0; current_override
< NO_OVERRIDES
; ++current_override
) {
226 if (overrides
[current_override
].address
) {
227 addr
= overrides
[current_override
].address
;
228 base
= ioremap(addr
, 0x2000);
232 for (; !addr
&& (current_base
< NO_BASES
); ++current_base
) {
233 #if (DTCDEBUG & DTCDEBUG_INIT)
234 printk(KERN_DEBUG
"scsi-dtc : probing address %08x\n", bases
[current_base
].address
);
236 if (bases
[current_base
].noauto
)
238 base
= ioremap(bases
[current_base
].address
, 0x2000);
241 for (sig
= 0; sig
< NO_SIGNATURES
; ++sig
) {
242 if (check_signature(base
+ signatures
[sig
].offset
, signatures
[sig
].string
, strlen(signatures
[sig
].string
))) {
243 addr
= bases
[current_base
].address
;
244 #if (DTCDEBUG & DTCDEBUG_INIT)
245 printk(KERN_DEBUG
"scsi-dtc : detected board.\n");
253 #if defined(DTCDEBUG) && (DTCDEBUG & DTCDEBUG_INIT)
254 printk(KERN_DEBUG
"scsi-dtc : base = %08x\n", addr
);
261 instance
= scsi_register(tpnt
, sizeof(struct NCR5380_hostdata
));
262 if (instance
== NULL
)
265 instance
->base
= addr
;
266 ((struct NCR5380_hostdata
*)(instance
)->hostdata
)->base
= base
;
268 NCR5380_init(instance
, 0);
270 NCR5380_write(DTC_CONTROL_REG
, CSR_5380_INTR
); /* Enable int's */
271 if (overrides
[current_override
].irq
!= IRQ_AUTO
)
272 instance
->irq
= overrides
[current_override
].irq
;
274 instance
->irq
= NCR5380_probe_irq(instance
, DTC_IRQS
);
276 #ifndef DONT_USE_INTR
277 /* With interrupts enabled, it will sometimes hang when doing heavy
278 * reads. So better not enable them until I finger it out. */
279 if (instance
->irq
!= SCSI_IRQ_NONE
)
280 if (request_irq(instance
->irq
, dtc_intr
, IRQF_DISABLED
,
282 printk(KERN_ERR
"scsi%d : IRQ%d not free, interrupts disabled\n", instance
->host_no
, instance
->irq
);
283 instance
->irq
= SCSI_IRQ_NONE
;
286 if (instance
->irq
== SCSI_IRQ_NONE
) {
287 printk(KERN_WARNING
"scsi%d : interrupts not enabled. for better interactive performance,\n", instance
->host_no
);
288 printk(KERN_WARNING
"scsi%d : please jumper the board for a free IRQ.\n", instance
->host_no
);
291 if (instance
->irq
!= SCSI_IRQ_NONE
)
292 printk(KERN_WARNING
"scsi%d : interrupts not used. Might as well not jumper it.\n", instance
->host_no
);
293 instance
->irq
= SCSI_IRQ_NONE
;
295 #if defined(DTCDEBUG) && (DTCDEBUG & DTCDEBUG_INIT)
296 printk("scsi%d : irq = %d\n", instance
->host_no
, instance
->irq
);
299 printk(KERN_INFO
"scsi%d : at 0x%05X", instance
->host_no
, (int) instance
->base
);
300 if (instance
->irq
== SCSI_IRQ_NONE
)
301 printk(" interrupts disabled");
303 printk(" irq %d", instance
->irq
);
304 printk(" options CAN_QUEUE=%d CMD_PER_LUN=%d release=%d", CAN_QUEUE
, CMD_PER_LUN
, DTC_PUBLIC_RELEASE
);
305 NCR5380_print_options(instance
);
315 * Function : int dtc_biosparam(Disk * disk, struct block_device *dev, int *ip)
317 * Purpose : Generates a BIOS / DOS compatible H-C-S mapping for
318 * the specified device / size.
320 * Inputs : size = size of device in sectors (512 bytes), dev = block device
321 * major / minor, ip[] = {heads, sectors, cylinders}
323 * Returns : always 0 (success), initializes ip
328 * XXX Most SCSI boards use this mapping, I could be incorrect. Some one
329 * using hard disks on a trantor should verify that this mapping corresponds
330 * to that used by the BIOS / ASPI driver by running the linux fdisk program
331 * and matching the H_C_S coordinates to what DOS uses.
334 static int dtc_biosparam(struct scsi_device
*sdev
, struct block_device
*dev
,
335 sector_t capacity
, int *ip
)
346 /****************************************************************
347 * Function : int NCR5380_pread (struct Scsi_Host *instance,
348 * unsigned char *dst, int len)
350 * Purpose : Fast 5380 pseudo-dma read function, reads len bytes to
353 * Inputs : dst = destination, len = length in bytes
355 * Returns : 0 on success, non zero on a failure such as a watchdog
359 static int dtc_maxi
= 0;
360 static int dtc_wmaxi
= 0;
362 static inline int NCR5380_pread(struct Scsi_Host
*instance
, unsigned char *dst
, int len
)
364 unsigned char *d
= dst
;
365 int i
; /* For counting time spent in the poll-loop */
366 NCR5380_local_declare();
367 NCR5380_setup(instance
);
370 NCR5380_read(RESET_PARITY_INTERRUPT_REG
);
371 NCR5380_write(MODE_REG
, MR_ENABLE_EOP_INTR
| MR_DMA_MODE
);
372 if (instance
->irq
== SCSI_IRQ_NONE
)
373 NCR5380_write(DTC_CONTROL_REG
, CSR_DIR_READ
);
375 NCR5380_write(DTC_CONTROL_REG
, CSR_DIR_READ
| CSR_INT_BASE
);
376 NCR5380_write(DTC_BLK_CNT
, len
>> 7); /* Block count */
380 while (NCR5380_read(DTC_CONTROL_REG
) & CSR_HOST_BUF_NOT_RDY
)
383 memcpy_fromio(d
, base
+ DTC_DATA_BUF
, 128);
387 /*** with int's on, it sometimes hangs after here.
388 * Looks like something makes HBNR go away. */
391 while (!(NCR5380_read(DTC_CONTROL_REG
) & D_CR_ACCESS
))
393 NCR5380_write(MODE_REG
, 0); /* Clear the operating mode */
395 NCR5380_read(RESET_PARITY_INTERRUPT_REG
);
401 /****************************************************************
402 * Function : int NCR5380_pwrite (struct Scsi_Host *instance,
403 * unsigned char *src, int len)
405 * Purpose : Fast 5380 pseudo-dma write function, transfers len bytes from
408 * Inputs : src = source, len = length in bytes
410 * Returns : 0 on success, non zero on a failure such as a watchdog
414 static inline int NCR5380_pwrite(struct Scsi_Host
*instance
, unsigned char *src
, int len
)
417 NCR5380_local_declare();
418 NCR5380_setup(instance
);
420 NCR5380_read(RESET_PARITY_INTERRUPT_REG
);
421 NCR5380_write(MODE_REG
, MR_ENABLE_EOP_INTR
| MR_DMA_MODE
);
422 /* set direction (write) */
423 if (instance
->irq
== SCSI_IRQ_NONE
)
424 NCR5380_write(DTC_CONTROL_REG
, 0);
426 NCR5380_write(DTC_CONTROL_REG
, CSR_5380_INTR
);
427 NCR5380_write(DTC_BLK_CNT
, len
>> 7); /* Block count */
428 for (i
= 0; len
> 0; ++i
) {
430 /* Poll until the host buffer can accept data. */
431 while (NCR5380_read(DTC_CONTROL_REG
) & CSR_HOST_BUF_NOT_RDY
)
434 memcpy_toio(base
+ DTC_DATA_BUF
, src
, 128);
439 while (!(NCR5380_read(DTC_CONTROL_REG
) & D_CR_ACCESS
))
442 /* Wait until the last byte has been sent to the disk */
443 while (!(NCR5380_read(TARGET_COMMAND_REG
) & TCR_LAST_BYTE_SENT
))
446 /* Check for parity error here. fixme. */
447 NCR5380_write(MODE_REG
, 0); /* Clear the operating mode */
454 MODULE_LICENSE("GPL");
458 static int dtc_release(struct Scsi_Host
*shost
)
460 NCR5380_local_declare();
461 NCR5380_setup(shost
);
463 free_irq(shost
->irq
, shost
);
465 if (shost
->io_port
&& shost
->n_io_port
)
466 release_region(shost
->io_port
, shost
->n_io_port
);
467 scsi_unregister(shost
);
472 static struct scsi_host_template driver_template
= {
473 .name
= "DTC 3180/3280 ",
474 .detect
= dtc_detect
,
475 .release
= dtc_release
,
476 .queuecommand
= dtc_queue_command
,
477 .eh_abort_handler
= dtc_abort
,
478 .eh_bus_reset_handler
= dtc_bus_reset
,
479 .bios_param
= dtc_biosparam
,
480 .can_queue
= CAN_QUEUE
,
482 .sg_tablesize
= SG_ALL
,
483 .cmd_per_lun
= CMD_PER_LUN
,
484 .use_clustering
= DISABLE_CLUSTERING
,
486 #include "scsi_module.c"