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