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 DMA_WORKS_RIGHT
7
8
9/*
10 * DTC 3180/3280 driver, by
11 * Ray Van Tassle rayvt@comm.mot.com
12 *
13 * taken from ...
14 * Trantor T128/T128F/T228 driver by...
15 *
16 * Drew Eckhardt
17 * Visionary Computing
18 * (Unix and Linux consulting and custom programming)
19 * drew@colorado.edu
20 * +1 (303) 440-4894
21 *
22 * DISTRIBUTION RELEASE 1.
23 *
24 * For more information, please consult
25 *
26 * NCR 5380 Family
27 * SCSI Protocol Controller
28 * Databook
29*/
30
31/*
32 * Options :
33 * AUTOSENSE - if defined, REQUEST SENSE will be performed automatically
34 * for commands that return with a CHECK CONDITION status.
35 *
36 * PSEUDO_DMA - enables PSEUDO-DMA hardware, should give a 3-4X performance
37 * increase compared to polled I/O.
38 *
39 * PARITY - enable parity checking. Not supported.
40 *
41 * UNSAFE - leave interrupts enabled during pseudo-DMA transfers.
42 * You probably want this.
43 *
44 * The card is detected and initialized in one of several ways :
45 * 1. Autoprobe (default) - since the board is memory mapped,
46 * a BIOS signature is scanned for to locate the registers.
47 * An interrupt is triggered to autoprobe for the interrupt
48 * line.
49 *
50 * 2. With command line overrides - dtc=address,irq may be
51 * used on the LILO command line to override the defaults.
52 *
53*/
54
55/*----------------------------------------------------------------*/
56/* the following will set the monitor border color (useful to find
57 where something crashed or gets stuck at */
58/* 1 = blue
59 2 = green
60 3 = cyan
61 4 = red
62 5 = magenta
63 6 = yellow
64 7 = white
65*/
66#if 0
67#define rtrc(i) {inb(0x3da); outb(0x31, 0x3c0); outb((i), 0x3c0);}
68#else
69#define rtrc(i) {}
70#endif
71
72
73#include <linux/module.h>
74#include <linux/signal.h>
75#include <linux/blkdev.h>
76#include <linux/delay.h>
77#include <linux/stat.h>
78#include <linux/string.h>
79#include <linux/init.h>
80#include <linux/interrupt.h>
81#include <linux/io.h>
82#include "scsi.h"
83#include <scsi/scsi_host.h>
84#include "dtc.h"
85#define AUTOPROBE_IRQ
86#include "NCR5380.h"
87
88
89#define DTC_PUBLIC_RELEASE 2
90
91/*
92 * The DTC3180 & 3280 boards are memory mapped.
93 *
94 */
95
96/*
97 */
98/* Offset from DTC_5380_OFFSET */
99#define DTC_CONTROL_REG 0x100 /* rw */
100#define D_CR_ACCESS 0x80 /* ro set=can access 3280 registers */
101#define CSR_DIR_READ 0x40 /* rw direction, 1 = read 0 = write */
102
103#define CSR_RESET 0x80 /* wo Resets 53c400 */
104#define CSR_5380_REG 0x80 /* ro 5380 registers can be accessed */
105#define CSR_TRANS_DIR 0x40 /* rw Data transfer direction */
106#define CSR_SCSI_BUFF_INTR 0x20 /* rw Enable int on transfer ready */
107#define CSR_5380_INTR 0x10 /* rw Enable 5380 interrupts */
108#define CSR_SHARED_INTR 0x08 /* rw Interrupt sharing */
109#define CSR_HOST_BUF_NOT_RDY 0x04 /* ro Host buffer not ready */
110#define CSR_SCSI_BUF_RDY 0x02 /* ro SCSI buffer ready */
111#define CSR_GATED_5380_IRQ 0x01 /* ro Last block xferred */
112#define CSR_INT_BASE (CSR_SCSI_BUFF_INTR | CSR_5380_INTR)
113
114
115#define DTC_BLK_CNT 0x101 /* rw
116 * # of 128-byte blocks to transfer */
117
118
119#define D_CR_ACCESS 0x80 /* ro set=can access 3280 registers */
120
121#define DTC_SWITCH_REG 0x3982 /* ro - DIP switches */
122#define DTC_RESUME_XFER 0x3982 /* wo - resume data xfer
123 * after disconnect/reconnect*/
124
125#define DTC_5380_OFFSET 0x3880 /* 8 registers here, see NCR5380.h */
126
127/*!!!! for dtc, it's a 128 byte buffer at 3900 !!! */
128#define DTC_DATA_BUF 0x3900 /* rw 128 bytes long */
129
130static struct override {
131 unsigned int address;
132 int irq;
133} overrides
134#ifdef OVERRIDE
135[] __initdata = OVERRIDE;
136#else
137[4] __initdata = {
138 { 0, IRQ_AUTO }, { 0, IRQ_AUTO }, { 0, IRQ_AUTO }, { 0, IRQ_AUTO }
139};
140#endif
141
142#define NO_OVERRIDES ARRAY_SIZE(overrides)
143
144static struct base {
145 unsigned long address;
146 int noauto;
147} bases[] __initdata = {
148 { 0xcc000, 0 },
149 { 0xc8000, 0 },
150 { 0xdc000, 0 },
151 { 0xd8000, 0 }
152};
153
154#define NO_BASES ARRAY_SIZE(bases)
155
156static const struct signature {
157 const char *string;
158 int offset;
159} signatures[] = {
160 {"DATA TECHNOLOGY CORPORATION BIOS", 0x25},
161};
162
163#define NO_SIGNATURES ARRAY_SIZE(signatures)
164
165#ifndef MODULE
166/*
167 * Function : dtc_setup(char *str, int *ints)
168 *
169 * Purpose : LILO command line initialization of the overrides array,
170 *
171 * Inputs : str - unused, ints - array of integer parameters with ints[0]
172 * equal to the number of ints.
173 *
174 */
175
176static void __init dtc_setup(char *str, int *ints)
177{
178 static int commandline_current = 0;
179 int i;
180 if (ints[0] != 2)
181 printk("dtc_setup: usage dtc=address,irq\n");
182 else if (commandline_current < NO_OVERRIDES) {
183 overrides[commandline_current].address = ints[1];
184 overrides[commandline_current].irq = ints[2];
185 for (i = 0; i < NO_BASES; ++i)
186 if (bases[i].address == ints[1]) {
187 bases[i].noauto = 1;
188 break;
189 }
190 ++commandline_current;
191 }
192}
193#endif
194
195/*
196 * Function : int dtc_detect(struct scsi_host_template * tpnt)
197 *
198 * Purpose : detects and initializes DTC 3180/3280 controllers
199 * that were autoprobed, overridden on the LILO command line,
200 * or specified at compile time.
201 *
202 * Inputs : tpnt - template for this SCSI adapter.
203 *
204 * Returns : 1 if a host adapter was found, 0 if not.
205 *
206*/
207
208static int __init dtc_detect(struct scsi_host_template * tpnt)
209{
210 static int current_override = 0, current_base = 0;
211 struct Scsi_Host *instance;
212 unsigned int addr;
213 void __iomem *base;
214 int sig, count;
215
216 tpnt->proc_name = "dtc3x80";
217 tpnt->show_info = dtc_show_info;
218 tpnt->write_info = dtc_write_info;
219
220 for (count = 0; current_override < NO_OVERRIDES; ++current_override) {
221 addr = 0;
222 base = NULL;
223
224 if (overrides[current_override].address) {
225 addr = overrides[current_override].address;
226 base = ioremap(addr, 0x2000);
227 if (!base)
228 addr = 0;
229 } else
230 for (; !addr && (current_base < NO_BASES); ++current_base) {
231#if (DTCDEBUG & DTCDEBUG_INIT)
232 printk(KERN_DEBUG "scsi-dtc : probing address %08x\n", bases[current_base].address);
233#endif
234 if (bases[current_base].noauto)
235 continue;
236 base = ioremap(bases[current_base].address, 0x2000);
237 if (!base)
238 continue;
239 for (sig = 0; sig < NO_SIGNATURES; ++sig) {
240 if (check_signature(base + signatures[sig].offset, signatures[sig].string, strlen(signatures[sig].string))) {
241 addr = bases[current_base].address;
242#if (DTCDEBUG & DTCDEBUG_INIT)
243 printk(KERN_DEBUG "scsi-dtc : detected board.\n");
244#endif
245 goto found;
246 }
247 }
248 iounmap(base);
249 }
250
251#if defined(DTCDEBUG) && (DTCDEBUG & DTCDEBUG_INIT)
252 printk(KERN_DEBUG "scsi-dtc : base = %08x\n", addr);
253#endif
254
255 if (!addr)
256 break;
257
258found:
259 instance = scsi_register(tpnt, sizeof(struct NCR5380_hostdata));
260 if (instance == NULL)
261 break;
262
263 instance->base = addr;
264 ((struct NCR5380_hostdata *)(instance)->hostdata)->base = base;
265
266 NCR5380_init(instance, 0);
267
268 NCR5380_write(DTC_CONTROL_REG, CSR_5380_INTR); /* Enable int's */
269 if (overrides[current_override].irq != IRQ_AUTO)
270 instance->irq = overrides[current_override].irq;
271 else
272 instance->irq = NCR5380_probe_irq(instance, DTC_IRQS);
273
274#ifndef DONT_USE_INTR
275 /* With interrupts enabled, it will sometimes hang when doing heavy
276 * reads. So better not enable them until I finger it out. */
277 if (instance->irq != SCSI_IRQ_NONE)
278 if (request_irq(instance->irq, dtc_intr, 0,
279 "dtc", instance)) {
280 printk(KERN_ERR "scsi%d : IRQ%d not free, interrupts disabled\n", instance->host_no, instance->irq);
281 instance->irq = SCSI_IRQ_NONE;
282 }
283
284 if (instance->irq == SCSI_IRQ_NONE) {
285 printk(KERN_WARNING "scsi%d : interrupts not enabled. for better interactive performance,\n", instance->host_no);
286 printk(KERN_WARNING "scsi%d : please jumper the board for a free IRQ.\n", instance->host_no);
287 }
288#else
289 if (instance->irq != SCSI_IRQ_NONE)
290 printk(KERN_WARNING "scsi%d : interrupts not used. Might as well not jumper it.\n", instance->host_no);
291 instance->irq = SCSI_IRQ_NONE;
292#endif
293#if defined(DTCDEBUG) && (DTCDEBUG & DTCDEBUG_INIT)
294 printk("scsi%d : irq = %d\n", instance->host_no, instance->irq);
295#endif
296
297 printk(KERN_INFO "scsi%d : at 0x%05X", instance->host_no, (int) instance->base);
298 if (instance->irq == SCSI_IRQ_NONE)
299 printk(" interrupts disabled");
300 else
301 printk(" irq %d", instance->irq);
302 printk(" options CAN_QUEUE=%d CMD_PER_LUN=%d release=%d", CAN_QUEUE, CMD_PER_LUN, DTC_PUBLIC_RELEASE);
303 NCR5380_print_options(instance);
304 printk("\n");
305
306 ++current_override;
307 ++count;
308 }
309 return count;
310}
311
312/*
313 * Function : int dtc_biosparam(Disk * disk, struct block_device *dev, int *ip)
314 *
315 * Purpose : Generates a BIOS / DOS compatible H-C-S mapping for
316 * the specified device / size.
317 *
318 * Inputs : size = size of device in sectors (512 bytes), dev = block device
319 * major / minor, ip[] = {heads, sectors, cylinders}
320 *
321 * Returns : always 0 (success), initializes ip
322 *
323*/
324
325/*
326 * XXX Most SCSI boards use this mapping, I could be incorrect. Some one
327 * using hard disks on a trantor should verify that this mapping corresponds
328 * to that used by the BIOS / ASPI driver by running the linux fdisk program
329 * and matching the H_C_S coordinates to what DOS uses.
330*/
331
332static int dtc_biosparam(struct scsi_device *sdev, struct block_device *dev,
333 sector_t capacity, int *ip)
334{
335 int size = capacity;
336
337 ip[0] = 64;
338 ip[1] = 32;
339 ip[2] = size >> 11;
340 return 0;
341}
342
343
344/****************************************************************
345 * Function : int NCR5380_pread (struct Scsi_Host *instance,
346 * unsigned char *dst, int len)
347 *
348 * Purpose : Fast 5380 pseudo-dma read function, reads len bytes to
349 * dst
350 *
351 * Inputs : dst = destination, len = length in bytes
352 *
353 * Returns : 0 on success, non zero on a failure such as a watchdog
354 * timeout.
355*/
356
357static int dtc_maxi = 0;
358static int dtc_wmaxi = 0;
359
360static inline int NCR5380_pread(struct Scsi_Host *instance, unsigned char *dst, int len)
361{
362 unsigned char *d = dst;
363 int i; /* For counting time spent in the poll-loop */
364 NCR5380_local_declare();
365 NCR5380_setup(instance);
366
367 i = 0;
368 NCR5380_read(RESET_PARITY_INTERRUPT_REG);
369 NCR5380_write(MODE_REG, MR_ENABLE_EOP_INTR | MR_DMA_MODE);
370 if (instance->irq == SCSI_IRQ_NONE)
371 NCR5380_write(DTC_CONTROL_REG, CSR_DIR_READ);
372 else
373 NCR5380_write(DTC_CONTROL_REG, CSR_DIR_READ | CSR_INT_BASE);
374 NCR5380_write(DTC_BLK_CNT, len >> 7); /* Block count */
375 rtrc(1);
376 while (len > 0) {
377 rtrc(2);
378 while (NCR5380_read(DTC_CONTROL_REG) & CSR_HOST_BUF_NOT_RDY)
379 ++i;
380 rtrc(3);
381 memcpy_fromio(d, base + DTC_DATA_BUF, 128);
382 d += 128;
383 len -= 128;
384 rtrc(7);
385 /*** with int's on, it sometimes hangs after here.
386 * Looks like something makes HBNR go away. */
387 }
388 rtrc(4);
389 while (!(NCR5380_read(DTC_CONTROL_REG) & D_CR_ACCESS))
390 ++i;
391 NCR5380_write(MODE_REG, 0); /* Clear the operating mode */
392 rtrc(0);
393 NCR5380_read(RESET_PARITY_INTERRUPT_REG);
394 if (i > dtc_maxi)
395 dtc_maxi = i;
396 return (0);
397}
398
399/****************************************************************
400 * Function : int NCR5380_pwrite (struct Scsi_Host *instance,
401 * unsigned char *src, int len)
402 *
403 * Purpose : Fast 5380 pseudo-dma write function, transfers len bytes from
404 * src
405 *
406 * Inputs : src = source, len = length in bytes
407 *
408 * Returns : 0 on success, non zero on a failure such as a watchdog
409 * timeout.
410*/
411
412static inline int NCR5380_pwrite(struct Scsi_Host *instance, unsigned char *src, int len)
413{
414 int i;
415 NCR5380_local_declare();
416 NCR5380_setup(instance);
417
418 NCR5380_read(RESET_PARITY_INTERRUPT_REG);
419 NCR5380_write(MODE_REG, MR_ENABLE_EOP_INTR | MR_DMA_MODE);
420 /* set direction (write) */
421 if (instance->irq == SCSI_IRQ_NONE)
422 NCR5380_write(DTC_CONTROL_REG, 0);
423 else
424 NCR5380_write(DTC_CONTROL_REG, CSR_5380_INTR);
425 NCR5380_write(DTC_BLK_CNT, len >> 7); /* Block count */
426 for (i = 0; len > 0; ++i) {
427 rtrc(5);
428 /* Poll until the host buffer can accept data. */
429 while (NCR5380_read(DTC_CONTROL_REG) & CSR_HOST_BUF_NOT_RDY)
430 ++i;
431 rtrc(3);
432 memcpy_toio(base + DTC_DATA_BUF, src, 128);
433 src += 128;
434 len -= 128;
435 }
436 rtrc(4);
437 while (!(NCR5380_read(DTC_CONTROL_REG) & D_CR_ACCESS))
438 ++i;
439 rtrc(6);
440 /* Wait until the last byte has been sent to the disk */
441 while (!(NCR5380_read(TARGET_COMMAND_REG) & TCR_LAST_BYTE_SENT))
442 ++i;
443 rtrc(7);
444 /* Check for parity error here. fixme. */
445 NCR5380_write(MODE_REG, 0); /* Clear the operating mode */
446 rtrc(0);
447 if (i > dtc_wmaxi)
448 dtc_wmaxi = i;
449 return (0);
450}
451
452MODULE_LICENSE("GPL");
453
454#include "NCR5380.c"
455
456static int dtc_release(struct Scsi_Host *shost)
457{
458 NCR5380_local_declare();
459 NCR5380_setup(shost);
460 if (shost->irq)
461 free_irq(shost->irq, shost);
462 NCR5380_exit(shost);
463 if (shost->io_port && shost->n_io_port)
464 release_region(shost->io_port, shost->n_io_port);
465 scsi_unregister(shost);
466 iounmap(base);
467 return 0;
468}
469
470static struct scsi_host_template driver_template = {
471 .name = "DTC 3180/3280 ",
472 .detect = dtc_detect,
473 .release = dtc_release,
474 .queuecommand = dtc_queue_command,
475 .eh_abort_handler = dtc_abort,
476 .eh_bus_reset_handler = dtc_bus_reset,
477 .bios_param = dtc_biosparam,
478 .can_queue = CAN_QUEUE,
479 .this_id = 7,
480 .sg_tablesize = SG_ALL,
481 .cmd_per_lun = CMD_PER_LUN,
482 .use_clustering = DISABLE_CLUSTERING,
483};
484#include "scsi_module.c"