tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1
2#define AUTOSENSE
3#define PSEUDO_DMA
4#define DONT_USE_INTR
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
9
10
11/*
12 * DTC 3180/3280 driver, by
13 * Ray Van Tassle rayvt@comm.mot.com
14 *
15 * taken from ...
16 * Trantor T128/T128F/T228 driver by...
17 *
18 * Drew Eckhardt
19 * Visionary Computing
20 * (Unix and Linux consulting and custom programming)
21 * drew@colorado.edu
22 * +1 (303) 440-4894
23 *
24 * DISTRIBUTION RELEASE 1.
25 *
26 * For more information, please consult
27 *
28 * NCR 5380 Family
29 * SCSI Protocol Controller
30 * Databook
31*/
32
33/*
34 * Options :
35 * AUTOSENSE - if defined, REQUEST SENSE will be performed automatically
36 * for commands that return with a CHECK CONDITION status.
37 *
38 * PSEUDO_DMA - enables PSEUDO-DMA hardware, should give a 3-4X performance
39 * increase compared to polled I/O.
40 *
41 * PARITY - enable parity checking. Not supported.
42 *
43 * UNSAFE - leave interrupts enabled during pseudo-DMA transfers.
44 * You probably want this.
45 *
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
50 * line.
51 *
52 * 2. With command line overrides - dtc=address,irq may be
53 * used on the LILO command line to override the defaults.
54 *
55*/
56
57/*----------------------------------------------------------------*/
58/* the following will set the monitor border color (useful to find
59 where something crashed or gets stuck at */
60/* 1 = blue
61 2 = green
62 3 = cyan
63 4 = red
64 5 = magenta
65 6 = yellow
66 7 = white
67*/
68#if 0
69#define rtrc(i) {inb(0x3da); outb(0x31, 0x3c0); outb((i), 0x3c0);}
70#else
71#define rtrc(i) {}
72#endif
73
74
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>
85#include <asm/io.h>
86#include "scsi.h"
87#include <scsi/scsi_host.h>
88#include "dtc.h"
89#define AUTOPROBE_IRQ
90#include "NCR5380.h"
91
92
93#define DTC_PUBLIC_RELEASE 2
94
95/*#define DTCDEBUG 0x1*/
96#define DTCDEBUG_INIT 0x1
97#define DTCDEBUG_TRANSFER 0x2
98
99/*
100 * The DTC3180 & 3280 boards are memory mapped.
101 *
102 */
103
104/*
105 */
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 */
110
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)
121
122
123#define DTC_BLK_CNT 0x101 /* rw
124 * # of 128-byte blocks to transfer */
125
126
127#define D_CR_ACCESS 0x80 /* ro set=can access 3280 registers */
128
129#define DTC_SWITCH_REG 0x3982 /* ro - DIP switches */
130#define DTC_RESUME_XFER 0x3982 /* wo - resume data xfer
131 * after disconnect/reconnect*/
132
133#define DTC_5380_OFFSET 0x3880 /* 8 registers here, see NCR5380.h */
134
135/*!!!! for dtc, it's a 128 byte buffer at 3900 !!! */
136#define DTC_DATA_BUF 0x3900 /* rw 128 bytes long */
137
138static struct override {
139 unsigned int address;
140 int irq;
141} overrides
142#ifdef OVERRIDE
143[] __initdata = OVERRIDE;
144#else
145[4] __initdata = { {
1460, IRQ_AUTO}, {
1470, IRQ_AUTO}, {
1480, IRQ_AUTO}, {
1490, IRQ_AUTO}};
150#endif
151
152#define NO_OVERRIDES (sizeof(overrides) / sizeof(struct override))
153
154static struct base {
155 unsigned long address;
156 int noauto;
157} bases[] __initdata = {
158 { 0xcc000, 0 },
159 { 0xc8000, 0 },
160 { 0xdc000, 0 },
161 { 0xd8000, 0 }
162};
163
164#define NO_BASES (sizeof (bases) / sizeof (struct base))
165
166static const struct signature {
167 const char *string;
168 int offset;
169} signatures[] = {
170 {"DATA TECHNOLOGY CORPORATION BIOS", 0x25},
171};
172
173#define NO_SIGNATURES (sizeof (signatures) / sizeof (struct signature))
174
175#ifndef MODULE
176/*
177 * Function : dtc_setup(char *str, int *ints)
178 *
179 * Purpose : LILO command line initialization of the overrides array,
180 *
181 * Inputs : str - unused, ints - array of integer parameters with ints[0]
182 * equal to the number of ints.
183 *
184*/
185
186static void __init dtc_setup(char *str, int *ints)
187{
188 static int commandline_current = 0;
189 int i;
190 if (ints[0] != 2)
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]) {
197 bases[i].noauto = 1;
198 break;
199 }
200 ++commandline_current;
201 }
202}
203#endif
204
205/*
206 * Function : int dtc_detect(Scsi_Host_Template * tpnt)
207 *
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.
211 *
212 * Inputs : tpnt - template for this SCSI adapter.
213 *
214 * Returns : 1 if a host adapter was found, 0 if not.
215 *
216*/
217
218static int __init dtc_detect(Scsi_Host_Template * tpnt)
219{
220 static int current_override = 0, current_base = 0;
221 struct Scsi_Host *instance;
222 unsigned int addr;
223 void __iomem *base;
224 int sig, count;
225
226 tpnt->proc_name = "dtc3x80";
227 tpnt->proc_info = &dtc_proc_info;
228
229 for (count = 0; current_override < NO_OVERRIDES; ++current_override) {
230 addr = 0;
231 base = NULL;
232
233 if (overrides[current_override].address) {
234 addr = overrides[current_override].address;
235 base = ioremap(addr, 0x2000);
236 if (!base)
237 addr = 0;
238 } else
239 for (; !addr && (current_base < NO_BASES); ++current_base) {
240#if (DTCDEBUG & DTCDEBUG_INIT)
241 printk("scsi-dtc : probing address %08x\n", bases[current_base].address);
242#endif
243 if (bases[current_base].noauto)
244 continue;
245 base = ioremap(bases[current_base].address, 0x2000);
246 if (!base)
247 continue;
248 for (sig = 0; sig < NO_SIGNATURES; ++sig) {
249 if (check_signature(base + signatures[sig].offset, signatures[sig].string, strlen(signatures[sig].string))) {
250 addr = bases[current_base].address;
251#if (DTCDEBUG & DTCDEBUG_INIT)
252 printk("scsi-dtc : detected board.\n");
253#endif
254 goto found;
255 }
256 }
257 iounmap(base);
258 }
259
260#if defined(DTCDEBUG) && (DTCDEBUG & DTCDEBUG_INIT)
261 printk("scsi-dtc : base = %08x\n", addr);
262#endif
263
264 if (!addr)
265 break;
266
267found:
268 instance = scsi_register(tpnt, sizeof(struct NCR5380_hostdata));
269 if (instance == NULL)
270 break;
271
272 instance->base = addr;
273 ((struct NCR5380_hostdata *)(instance)->hostdata)->base = base;
274
275 NCR5380_init(instance, 0);
276
277 NCR5380_write(DTC_CONTROL_REG, CSR_5380_INTR); /* Enable int's */
278 if (overrides[current_override].irq != IRQ_AUTO)
279 instance->irq = overrides[current_override].irq;
280 else
281 instance->irq = NCR5380_probe_irq(instance, DTC_IRQS);
282
283#ifndef DONT_USE_INTR
284 /* With interrupts enabled, it will sometimes hang when doing heavy
285 * reads. So better not enable them until I finger it out. */
286 if (instance->irq != SCSI_IRQ_NONE)
287 if (request_irq(instance->irq, dtc_intr, SA_INTERRUPT, "dtc", instance)) {
288 printk(KERN_ERR "scsi%d : IRQ%d not free, interrupts disabled\n", instance->host_no, instance->irq);
289 instance->irq = SCSI_IRQ_NONE;
290 }
291
292 if (instance->irq == SCSI_IRQ_NONE) {
293 printk(KERN_WARNING "scsi%d : interrupts not enabled. for better interactive performance,\n", instance->host_no);
294 printk(KERN_WARNING "scsi%d : please jumper the board for a free IRQ.\n", instance->host_no);
295 }
296#else
297 if (instance->irq != SCSI_IRQ_NONE)
298 printk(KERN_WARNING "scsi%d : interrupts not used. Might as well not jumper it.\n", instance->host_no);
299 instance->irq = SCSI_IRQ_NONE;
300#endif
301#if defined(DTCDEBUG) && (DTCDEBUG & DTCDEBUG_INIT)
302 printk("scsi%d : irq = %d\n", instance->host_no, instance->irq);
303#endif
304
305 printk(KERN_INFO "scsi%d : at 0x%05X", instance->host_no, (int) instance->base);
306 if (instance->irq == SCSI_IRQ_NONE)
307 printk(" interrupts disabled");
308 else
309 printk(" irq %d", instance->irq);
310 printk(" options CAN_QUEUE=%d CMD_PER_LUN=%d release=%d", CAN_QUEUE, CMD_PER_LUN, DTC_PUBLIC_RELEASE);
311 NCR5380_print_options(instance);
312 printk("\n");
313
314 ++current_override;
315 ++count;
316 }
317 return count;
318}
319
320/*
321 * Function : int dtc_biosparam(Disk * disk, struct block_device *dev, int *ip)
322 *
323 * Purpose : Generates a BIOS / DOS compatible H-C-S mapping for
324 * the specified device / size.
325 *
326 * Inputs : size = size of device in sectors (512 bytes), dev = block device
327 * major / minor, ip[] = {heads, sectors, cylinders}
328 *
329 * Returns : always 0 (success), initializes ip
330 *
331*/
332
333/*
334 * XXX Most SCSI boards use this mapping, I could be incorrect. Some one
335 * using hard disks on a trantor should verify that this mapping corresponds
336 * to that used by the BIOS / ASPI driver by running the linux fdisk program
337 * and matching the H_C_S coordinates to what DOS uses.
338*/
339
340static int dtc_biosparam(struct scsi_device *sdev, struct block_device *dev,
341 sector_t capacity, int *ip)
342{
343 int size = capacity;
344
345 ip[0] = 64;
346 ip[1] = 32;
347 ip[2] = size >> 11;
348 return 0;
349}
350
351
352/****************************************************************
353 * Function : int NCR5380_pread (struct Scsi_Host *instance,
354 * unsigned char *dst, int len)
355 *
356 * Purpose : Fast 5380 pseudo-dma read function, reads len bytes to
357 * dst
358 *
359 * Inputs : dst = destination, len = length in bytes
360 *
361 * Returns : 0 on success, non zero on a failure such as a watchdog
362 * timeout.
363*/
364
365static int dtc_maxi = 0;
366static int dtc_wmaxi = 0;
367
368static inline int NCR5380_pread(struct Scsi_Host *instance, unsigned char *dst, int len)
369{
370 unsigned char *d = dst;
371 int i; /* For counting time spent in the poll-loop */
372 NCR5380_local_declare();
373 NCR5380_setup(instance);
374
375 i = 0;
376 NCR5380_read(RESET_PARITY_INTERRUPT_REG);
377 NCR5380_write(MODE_REG, MR_ENABLE_EOP_INTR | MR_DMA_MODE);
378 if (instance->irq == SCSI_IRQ_NONE)
379 NCR5380_write(DTC_CONTROL_REG, CSR_DIR_READ);
380 else
381 NCR5380_write(DTC_CONTROL_REG, CSR_DIR_READ | CSR_INT_BASE);
382 NCR5380_write(DTC_BLK_CNT, len >> 7); /* Block count */
383 rtrc(1);
384 while (len > 0) {
385 rtrc(2);
386 while (NCR5380_read(DTC_CONTROL_REG) & CSR_HOST_BUF_NOT_RDY)
387 ++i;
388 rtrc(3);
389 memcpy_fromio(d, base + DTC_DATA_BUF, 128);
390 d += 128;
391 len -= 128;
392 rtrc(7);
393 /*** with int's on, it sometimes hangs after here.
394 * Looks like something makes HBNR go away. */
395 }
396 rtrc(4);
397 while (!(NCR5380_read(DTC_CONTROL_REG) & D_CR_ACCESS))
398 ++i;
399 NCR5380_write(MODE_REG, 0); /* Clear the operating mode */
400 rtrc(0);
401 NCR5380_read(RESET_PARITY_INTERRUPT_REG);
402 if (i > dtc_maxi)
403 dtc_maxi = i;
404 return (0);
405}
406
407/****************************************************************
408 * Function : int NCR5380_pwrite (struct Scsi_Host *instance,
409 * unsigned char *src, int len)
410 *
411 * Purpose : Fast 5380 pseudo-dma write function, transfers len bytes from
412 * src
413 *
414 * Inputs : src = source, len = length in bytes
415 *
416 * Returns : 0 on success, non zero on a failure such as a watchdog
417 * timeout.
418*/
419
420static inline int NCR5380_pwrite(struct Scsi_Host *instance, unsigned char *src, int len)
421{
422 int i;
423 NCR5380_local_declare();
424 NCR5380_setup(instance);
425
426 NCR5380_read(RESET_PARITY_INTERRUPT_REG);
427 NCR5380_write(MODE_REG, MR_ENABLE_EOP_INTR | MR_DMA_MODE);
428 /* set direction (write) */
429 if (instance->irq == SCSI_IRQ_NONE)
430 NCR5380_write(DTC_CONTROL_REG, 0);
431 else
432 NCR5380_write(DTC_CONTROL_REG, CSR_5380_INTR);
433 NCR5380_write(DTC_BLK_CNT, len >> 7); /* Block count */
434 for (i = 0; len > 0; ++i) {
435 rtrc(5);
436 /* Poll until the host buffer can accept data. */
437 while (NCR5380_read(DTC_CONTROL_REG) & CSR_HOST_BUF_NOT_RDY)
438 ++i;
439 rtrc(3);
440 memcpy_toio(base + DTC_DATA_BUF, src, 128);
441 src += 128;
442 len -= 128;
443 }
444 rtrc(4);
445 while (!(NCR5380_read(DTC_CONTROL_REG) & D_CR_ACCESS))
446 ++i;
447 rtrc(6);
448 /* Wait until the last byte has been sent to the disk */
449 while (!(NCR5380_read(TARGET_COMMAND_REG) & TCR_LAST_BYTE_SENT))
450 ++i;
451 rtrc(7);
452 /* Check for parity error here. fixme. */
453 NCR5380_write(MODE_REG, 0); /* Clear the operating mode */
454 rtrc(0);
455 if (i > dtc_wmaxi)
456 dtc_wmaxi = i;
457 return (0);
458}
459
460MODULE_LICENSE("GPL");
461
462#include "NCR5380.c"
463
464static int dtc_release(struct Scsi_Host *shost)
465{
466 NCR5380_local_declare();
467 NCR5380_setup(shost);
468 if (shost->irq)
469 free_irq(shost->irq, NULL);
470 NCR5380_exit(shost);
471 if (shost->io_port && shost->n_io_port)
472 release_region(shost->io_port, shost->n_io_port);
473 scsi_unregister(shost);
474 iounmap(base);
475 return 0;
476}
477
478static Scsi_Host_Template driver_template = {
479 .name = "DTC 3180/3280 ",
480 .detect = dtc_detect,
481 .release = dtc_release,
482 .queuecommand = dtc_queue_command,
483 .eh_abort_handler = dtc_abort,
484 .eh_bus_reset_handler = dtc_bus_reset,
485 .bios_param = dtc_biosparam,
486 .can_queue = CAN_QUEUE,
487 .this_id = 7,
488 .sg_tablesize = SG_ALL,
489 .cmd_per_lun = CMD_PER_LUN,
490 .use_clustering = DISABLE_CLUSTERING,
491};
492#include "scsi_module.c"