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1#define AUTOSENSE
2#define PSEUDO_DMA
3
4/*
5 * Trantor T128/T128F/T228 driver
6 * Note : architecturally, the T100 and T130 are different and won't
7 * work
8 *
9 * Copyright 1993, Drew Eckhardt
10 * Visionary Computing
11 * (Unix and Linux consulting and custom programming)
12 * drew@colorado.edu
13 * +1 (303) 440-4894
14 *
15 * DISTRIBUTION RELEASE 3.
16 *
17 * For more information, please consult
18 *
19 * Trantor Systems, Ltd.
20 * T128/T128F/T228 SCSI Host Adapter
21 * Hardware Specifications
22 *
23 * Trantor Systems, Ltd.
24 * 5415 Randall Place
25 * Fremont, CA 94538
26 * 1+ (415) 770-1400, FAX 1+ (415) 770-9910
27 *
28 * and
29 *
30 * NCR 5380 Family
31 * SCSI Protocol Controller
32 * Databook
33 *
34 * NCR Microelectronics
35 * 1635 Aeroplaza Drive
36 * Colorado Springs, CO 80916
37 * 1+ (719) 578-3400
38 * 1+ (800) 334-5454
39 */
40
41/*
42 * Options :
43 * AUTOSENSE - if defined, REQUEST SENSE will be performed automatically
44 * for commands that return with a CHECK CONDITION status.
45 *
46 * PSEUDO_DMA - enables PSEUDO-DMA hardware, should give a 3-4X performance
47 * increase compared to polled I/O.
48 *
49 * PARITY - enable parity checking. Not supported.
50 *
51 * SCSI2 - enable support for SCSI-II tagged queueing. Untested.
52 *
53 *
54 * UNSAFE - leave interrupts enabled during pseudo-DMA transfers. You
55 * only really want to use this if you're having a problem with
56 * dropped characters during high speed communications, and even
57 * then, you're going to be better off twiddling with transfersize.
58 *
59 * USLEEP - enable support for devices that don't disconnect. Untested.
60 *
61 * The card is detected and initialized in one of several ways :
62 * 1. Autoprobe (default) - since the board is memory mapped,
63 * a BIOS signature is scanned for to locate the registers.
64 * An interrupt is triggered to autoprobe for the interrupt
65 * line.
66 *
67 * 2. With command line overrides - t128=address,irq may be
68 * used on the LILO command line to override the defaults.
69 *
70 * 3. With the T128_OVERRIDE compile time define. This is
71 * specified as an array of address, irq tuples. Ie, for
72 * one board at the default 0xcc000 address, IRQ5, I could say
73 * -DT128_OVERRIDE={{0xcc000, 5}}
74 *
75 * Note that if the override methods are used, place holders must
76 * be specified for other boards in the system.
77 *
78 * T128/T128F jumper/dipswitch settings (note : on my sample, the switches
79 * were epoxy'd shut, meaning I couldn't change the 0xcc000 base address) :
80 *
81 * T128 Sw7 Sw8 Sw6 = 0ws Sw5 = boot
82 * T128F Sw6 Sw7 Sw5 = 0ws Sw4 = boot Sw8 = floppy disable
83 * cc000 off off
84 * c8000 off on
85 * dc000 on off
86 * d8000 on on
87 *
88 *
89 * Interrupts
90 * There is a 12 pin jumper block, jp1, numbered as follows :
91 * T128 (JP1) T128F (J5)
92 * 2 4 6 8 10 12 11 9 7 5 3 1
93 * 1 3 5 7 9 11 12 10 8 6 4 2
94 *
95 * 3 2-4
96 * 5 1-3
97 * 7 3-5
98 * T128F only
99 * 10 8-10
100 * 12 7-9
101 * 14 10-12
102 * 15 9-11
103 */
104
105/*
106 * $Log: t128.c,v $
107 */
108
109#include <linux/signal.h>
110#include <linux/io.h>
111#include <linux/blkdev.h>
112#include <linux/interrupt.h>
113#include <linux/stat.h>
114#include <linux/init.h>
115#include <linux/module.h>
116#include <linux/delay.h>
117
118#include "scsi.h"
119#include <scsi/scsi_host.h>
120#include "t128.h"
121#define AUTOPROBE_IRQ
122#include "NCR5380.h"
123
124static struct override {
125 unsigned long address;
126 int irq;
127} overrides
128#ifdef T128_OVERRIDE
129 [] __initdata = T128_OVERRIDE;
130#else
131 [4] __initdata = {{0, IRQ_AUTO}, {0, IRQ_AUTO},
132 {0 ,IRQ_AUTO}, {0, IRQ_AUTO}};
133#endif
134
135#define NO_OVERRIDES ARRAY_SIZE(overrides)
136
137static struct base {
138 unsigned int address;
139 int noauto;
140} bases[] __initdata = {
141 { 0xcc000, 0}, { 0xc8000, 0}, { 0xdc000, 0}, { 0xd8000, 0}
142};
143
144#define NO_BASES ARRAY_SIZE(bases)
145
146static struct signature {
147 const char *string;
148 int offset;
149} signatures[] __initdata = {
150{"TSROM: SCSI BIOS, Version 1.12", 0x36},
151};
152
153#define NO_SIGNATURES ARRAY_SIZE(signatures)
154
155/*
156 * Function : t128_setup(char *str, int *ints)
157 *
158 * Purpose : LILO command line initialization of the overrides array,
159 *
160 * Inputs : str - unused, ints - array of integer parameters with ints[0]
161 * equal to the number of ints.
162 *
163 */
164
165void __init t128_setup(char *str, int *ints){
166 static int commandline_current = 0;
167 int i;
168 if (ints[0] != 2)
169 printk("t128_setup : usage t128=address,irq\n");
170 else
171 if (commandline_current < NO_OVERRIDES) {
172 overrides[commandline_current].address = ints[1];
173 overrides[commandline_current].irq = ints[2];
174 for (i = 0; i < NO_BASES; ++i)
175 if (bases[i].address == ints[1]) {
176 bases[i].noauto = 1;
177 break;
178 }
179 ++commandline_current;
180 }
181}
182
183/*
184 * Function : int t128_detect(struct scsi_host_template * tpnt)
185 *
186 * Purpose : detects and initializes T128,T128F, or T228 controllers
187 * that were autoprobed, overridden on the LILO command line,
188 * or specified at compile time.
189 *
190 * Inputs : tpnt - template for this SCSI adapter.
191 *
192 * Returns : 1 if a host adapter was found, 0 if not.
193 *
194 */
195
196int __init t128_detect(struct scsi_host_template * tpnt){
197 static int current_override = 0, current_base = 0;
198 struct Scsi_Host *instance;
199 unsigned long base;
200 void __iomem *p;
201 int sig, count;
202
203 tpnt->proc_name = "t128";
204 tpnt->proc_info = &t128_proc_info;
205
206 for (count = 0; current_override < NO_OVERRIDES; ++current_override) {
207 base = 0;
208 p = NULL;
209
210 if (overrides[current_override].address) {
211 base = overrides[current_override].address;
212 p = ioremap(bases[current_base].address, 0x2000);
213 if (!p)
214 base = 0;
215 } else
216 for (; !base && (current_base < NO_BASES); ++current_base) {
217#if (TDEBUG & TDEBUG_INIT)
218 printk("scsi-t128 : probing address %08x\n", bases[current_base].address);
219#endif
220 if (bases[current_base].noauto)
221 continue;
222 p = ioremap(bases[current_base].address, 0x2000);
223 if (!p)
224 continue;
225 for (sig = 0; sig < NO_SIGNATURES; ++sig)
226 if (check_signature(p + signatures[sig].offset,
227 signatures[sig].string,
228 strlen(signatures[sig].string))) {
229 base = bases[current_base].address;
230#if (TDEBUG & TDEBUG_INIT)
231 printk("scsi-t128 : detected board.\n");
232#endif
233 goto found;
234 }
235 iounmap(p);
236 }
237
238#if defined(TDEBUG) && (TDEBUG & TDEBUG_INIT)
239 printk("scsi-t128 : base = %08x\n", (unsigned int) base);
240#endif
241
242 if (!base)
243 break;
244
245found:
246 instance = scsi_register (tpnt, sizeof(struct NCR5380_hostdata));
247 if(instance == NULL)
248 break;
249
250 instance->base = base;
251 ((struct NCR5380_hostdata *)instance->hostdata)->base = p;
252
253 NCR5380_init(instance, 0);
254
255 if (overrides[current_override].irq != IRQ_AUTO)
256 instance->irq = overrides[current_override].irq;
257 else
258 instance->irq = NCR5380_probe_irq(instance, T128_IRQS);
259
260 if (instance->irq != SCSI_IRQ_NONE)
261 if (request_irq(instance->irq, t128_intr, IRQF_DISABLED, "t128",
262 instance)) {
263 printk("scsi%d : IRQ%d not free, interrupts disabled\n",
264 instance->host_no, instance->irq);
265 instance->irq = SCSI_IRQ_NONE;
266 }
267
268 if (instance->irq == SCSI_IRQ_NONE) {
269 printk("scsi%d : interrupts not enabled. for better interactive performance,\n", instance->host_no);
270 printk("scsi%d : please jumper the board for a free IRQ.\n", instance->host_no);
271 }
272
273#if defined(TDEBUG) && (TDEBUG & TDEBUG_INIT)
274 printk("scsi%d : irq = %d\n", instance->host_no, instance->irq);
275#endif
276
277 printk("scsi%d : at 0x%08lx", instance->host_no, instance->base);
278 if (instance->irq == SCSI_IRQ_NONE)
279 printk (" interrupts disabled");
280 else
281 printk (" irq %d", instance->irq);
282 printk(" options CAN_QUEUE=%d CMD_PER_LUN=%d release=%d",
283 CAN_QUEUE, CMD_PER_LUN, T128_PUBLIC_RELEASE);
284 NCR5380_print_options(instance);
285 printk("\n");
286
287 ++current_override;
288 ++count;
289 }
290 return count;
291}
292
293static int t128_release(struct Scsi_Host *shost)
294{
295 NCR5380_local_declare();
296 NCR5380_setup(shost);
297 if (shost->irq)
298 free_irq(shost->irq, shost);
299 NCR5380_exit(shost);
300 if (shost->io_port && shost->n_io_port)
301 release_region(shost->io_port, shost->n_io_port);
302 scsi_unregister(shost);
303 iounmap(base);
304 return 0;
305}
306
307/*
308 * Function : int t128_biosparam(Disk * disk, struct block_device *dev, int *ip)
309 *
310 * Purpose : Generates a BIOS / DOS compatible H-C-S mapping for
311 * the specified device / size.
312 *
313 * Inputs : size = size of device in sectors (512 bytes), dev = block device
314 * major / minor, ip[] = {heads, sectors, cylinders}
315 *
316 * Returns : always 0 (success), initializes ip
317 *
318 */
319
320/*
321 * XXX Most SCSI boards use this mapping, I could be incorrect. Some one
322 * using hard disks on a trantor should verify that this mapping corresponds
323 * to that used by the BIOS / ASPI driver by running the linux fdisk program
324 * and matching the H_C_S coordinates to what DOS uses.
325 */
326
327int t128_biosparam(struct scsi_device *sdev, struct block_device *bdev,
328 sector_t capacity, int * ip)
329{
330 ip[0] = 64;
331 ip[1] = 32;
332 ip[2] = capacity >> 11;
333 return 0;
334}
335
336/*
337 * Function : int NCR5380_pread (struct Scsi_Host *instance,
338 * unsigned char *dst, int len)
339 *
340 * Purpose : Fast 5380 pseudo-dma read function, transfers len bytes to
341 * dst
342 *
343 * Inputs : dst = destination, len = length in bytes
344 *
345 * Returns : 0 on success, non zero on a failure such as a watchdog
346 * timeout.
347 */
348
349static inline int NCR5380_pread (struct Scsi_Host *instance, unsigned char *dst,
350 int len) {
351 NCR5380_local_declare();
352 void __iomem *reg;
353 unsigned char *d = dst;
354 register int i = len;
355
356 NCR5380_setup(instance);
357 reg = base + T_DATA_REG_OFFSET;
358
359#if 0
360 for (; i; --i) {
361 while (!(readb(base+T_STATUS_REG_OFFSET) & T_ST_RDY)) barrier();
362#else
363 while (!(readb(base+T_STATUS_REG_OFFSET) & T_ST_RDY)) barrier();
364 for (; i; --i) {
365#endif
366 *d++ = readb(reg);
367 }
368
369 if (readb(base + T_STATUS_REG_OFFSET) & T_ST_TIM) {
370 unsigned char tmp;
371 void __iomem *foo = base + T_CONTROL_REG_OFFSET;
372 tmp = readb(foo);
373 writeb(tmp | T_CR_CT, foo);
374 writeb(tmp, foo);
375 printk("scsi%d : watchdog timer fired in NCR5380_pread()\n",
376 instance->host_no);
377 return -1;
378 } else
379 return 0;
380}
381
382/*
383 * Function : int NCR5380_pwrite (struct Scsi_Host *instance,
384 * unsigned char *src, int len)
385 *
386 * Purpose : Fast 5380 pseudo-dma write function, transfers len bytes from
387 * src
388 *
389 * Inputs : src = source, len = length in bytes
390 *
391 * Returns : 0 on success, non zero on a failure such as a watchdog
392 * timeout.
393 */
394
395static inline int NCR5380_pwrite (struct Scsi_Host *instance, unsigned char *src,
396 int len) {
397 NCR5380_local_declare();
398 void __iomem *reg;
399 unsigned char *s = src;
400 register int i = len;
401
402 NCR5380_setup(instance);
403 reg = base + T_DATA_REG_OFFSET;
404
405#if 0
406 for (; i; --i) {
407 while (!(readb(base+T_STATUS_REG_OFFSET) & T_ST_RDY)) barrier();
408#else
409 while (!(readb(base+T_STATUS_REG_OFFSET) & T_ST_RDY)) barrier();
410 for (; i; --i) {
411#endif
412 writeb(*s++, reg);
413 }
414
415 if (readb(base + T_STATUS_REG_OFFSET) & T_ST_TIM) {
416 unsigned char tmp;
417 void __iomem *foo = base + T_CONTROL_REG_OFFSET;
418 tmp = readb(foo);
419 writeb(tmp | T_CR_CT, foo);
420 writeb(tmp, foo);
421 printk("scsi%d : watchdog timer fired in NCR5380_pwrite()\n",
422 instance->host_no);
423 return -1;
424 } else
425 return 0;
426}
427
428MODULE_LICENSE("GPL");
429
430#include "NCR5380.c"
431
432static struct scsi_host_template driver_template = {
433 .name = "Trantor T128/T128F/T228",
434 .detect = t128_detect,
435 .release = t128_release,
436 .queuecommand = t128_queue_command,
437 .eh_abort_handler = t128_abort,
438 .eh_bus_reset_handler = t128_bus_reset,
439 .bios_param = t128_biosparam,
440 .can_queue = CAN_QUEUE,
441 .this_id = 7,
442 .sg_tablesize = SG_ALL,
443 .cmd_per_lun = CMD_PER_LUN,
444 .use_clustering = DISABLE_CLUSTERING,
445};
446#include "scsi_module.c"