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>
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);
454 if (shost->io_port && shost->n_io_port)
455 release_region(shost->io_port, shost->n_io_port);
456 scsi_unregister(shost);
460 static Scsi_Host_Template driver_template = {
461 .name = "DTC 3180/3280 ",
462 .detect = dtc_detect,
463 .release = dtc_release,
464 .queuecommand = dtc_queue_command,
465 .eh_abort_handler = dtc_abort,
466 .eh_bus_reset_handler = dtc_bus_reset,
467 .eh_device_reset_handler = dtc_device_reset,
468 .eh_host_reset_handler = dtc_host_reset,
469 .bios_param = dtc_biosparam,
470 .can_queue = CAN_QUEUE,
472 .sg_tablesize = SG_ALL,
473 .cmd_per_lun = CMD_PER_LUN,
474 .use_clustering = DISABLE_CLUSTERING,
476 #include "scsi_module.c"