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/*
96 * The DTC3180 & 3280 boards are memory mapped.
97 *
98 */
99
100/*
101 */
102/* Offset from DTC_5380_OFFSET */
103#define DTC_CONTROL_REG 0x100 /* rw */
104#define D_CR_ACCESS 0x80 /* ro set=can access 3280 registers */
105#define CSR_DIR_READ 0x40 /* rw direction, 1 = read 0 = write */
106
107#define CSR_RESET 0x80 /* wo Resets 53c400 */
108#define CSR_5380_REG 0x80 /* ro 5380 registers can be accessed */
109#define CSR_TRANS_DIR 0x40 /* rw Data transfer direction */
110#define CSR_SCSI_BUFF_INTR 0x20 /* rw Enable int on transfer ready */
111#define CSR_5380_INTR 0x10 /* rw Enable 5380 interrupts */
112#define CSR_SHARED_INTR 0x08 /* rw Interrupt sharing */
113#define CSR_HOST_BUF_NOT_RDY 0x04 /* ro Host buffer not ready */
114#define CSR_SCSI_BUF_RDY 0x02 /* ro SCSI buffer ready */
115#define CSR_GATED_5380_IRQ 0x01 /* ro Last block xferred */
116#define CSR_INT_BASE (CSR_SCSI_BUFF_INTR | CSR_5380_INTR)
117
118
119#define DTC_BLK_CNT 0x101 /* rw
120 * # of 128-byte blocks to transfer */
121
122
123#define D_CR_ACCESS 0x80 /* ro set=can access 3280 registers */
124
125#define DTC_SWITCH_REG 0x3982 /* ro - DIP switches */
126#define DTC_RESUME_XFER 0x3982 /* wo - resume data xfer
127 * after disconnect/reconnect*/
128
129#define DTC_5380_OFFSET 0x3880 /* 8 registers here, see NCR5380.h */
130
131/*!!!! for dtc, it's a 128 byte buffer at 3900 !!! */
132#define DTC_DATA_BUF 0x3900 /* rw 128 bytes long */
133
134static struct override {
135 unsigned int address;
136 int irq;
137} overrides
138#ifdef OVERRIDE
139[] __initdata = OVERRIDE;
140#else
141[4] __initdata = { {
1420, IRQ_AUTO}, {
1430, IRQ_AUTO}, {
1440, IRQ_AUTO}, {
1450, IRQ_AUTO}};
146#endif
147
148#define NO_OVERRIDES (sizeof(overrides) / sizeof(struct override))
149
150static struct base {
151 unsigned long address;
152 int noauto;
153} bases[] __initdata = {
154 { 0xcc000, 0 },
155 { 0xc8000, 0 },
156 { 0xdc000, 0 },
157 { 0xd8000, 0 }
158};
159
160#define NO_BASES (sizeof (bases) / sizeof (struct base))
161
162static const struct signature {
163 const char *string;
164 int offset;
165} signatures[] = {
166 {"DATA TECHNOLOGY CORPORATION BIOS", 0x25},
167};
168
169#define NO_SIGNATURES (sizeof (signatures) / sizeof (struct signature))
170
171#ifndef MODULE
172/*
173 * Function : dtc_setup(char *str, int *ints)
174 *
175 * Purpose : LILO command line initialization of the overrides array,
176 *
177 * Inputs : str - unused, ints - array of integer parameters with ints[0]
178 * equal to the number of ints.
179 *
180*/
181
182static void __init dtc_setup(char *str, int *ints)
183{
184 static int commandline_current = 0;
185 int i;
186 if (ints[0] != 2)
187 printk("dtc_setup: usage dtc=address,irq\n");
188 else if (commandline_current < NO_OVERRIDES) {
189 overrides[commandline_current].address = ints[1];
190 overrides[commandline_current].irq = ints[2];
191 for (i = 0; i < NO_BASES; ++i)
192 if (bases[i].address == ints[1]) {
193 bases[i].noauto = 1;
194 break;
195 }
196 ++commandline_current;
197 }
198}
199#endif
200
201/*
202 * Function : int dtc_detect(Scsi_Host_Template * tpnt)
203 *
204 * Purpose : detects and initializes DTC 3180/3280 controllers
205 * that were autoprobed, overridden on the LILO command line,
206 * or specified at compile time.
207 *
208 * Inputs : tpnt - template for this SCSI adapter.
209 *
210 * Returns : 1 if a host adapter was found, 0 if not.
211 *
212*/
213
214static int __init dtc_detect(Scsi_Host_Template * tpnt)
215{
216 static int current_override = 0, current_base = 0;
217 struct Scsi_Host *instance;
218 unsigned int addr;
219 void __iomem *base;
220 int sig, count;
221
222 tpnt->proc_name = "dtc3x80";
223 tpnt->proc_info = &dtc_proc_info;
224
225 for (count = 0; current_override < NO_OVERRIDES; ++current_override) {
226 addr = 0;
227 base = NULL;
228
229 if (overrides[current_override].address) {
230 addr = overrides[current_override].address;
231 base = ioremap(addr, 0x2000);
232 if (!base)
233 addr = 0;
234 } else
235 for (; !addr && (current_base < NO_BASES); ++current_base) {
236#if (DTCDEBUG & DTCDEBUG_INIT)
237 printk("scsi-dtc : probing address %08x\n", bases[current_base].address);
238#endif
239 if (bases[current_base].noauto)
240 continue;
241 base = ioremap(bases[current_base].address, 0x2000);
242 if (!base)
243 continue;
244 for (sig = 0; sig < NO_SIGNATURES; ++sig) {
245 if (check_signature(base + signatures[sig].offset, signatures[sig].string, strlen(signatures[sig].string))) {
246 addr = bases[current_base].address;
247#if (DTCDEBUG & DTCDEBUG_INIT)
248 printk("scsi-dtc : detected board.\n");
249#endif
250 goto found;
251 }
252 }
253 iounmap(base);
254 }
255
256#if defined(DTCDEBUG) && (DTCDEBUG & DTCDEBUG_INIT)
257 printk("scsi-dtc : base = %08x\n", addr);
258#endif
259
260 if (!addr)
261 break;
262
263found:
264 instance = scsi_register(tpnt, sizeof(struct NCR5380_hostdata));
265 if (instance == NULL)
266 break;
267
268 instance->base = addr;
269 ((struct NCR5380_hostdata *)(instance)->hostdata)->base = base;
270
271 NCR5380_init(instance, 0);
272
273 NCR5380_write(DTC_CONTROL_REG, CSR_5380_INTR); /* Enable int's */
274 if (overrides[current_override].irq != IRQ_AUTO)
275 instance->irq = overrides[current_override].irq;
276 else
277 instance->irq = NCR5380_probe_irq(instance, DTC_IRQS);
278
279#ifndef DONT_USE_INTR
280 /* With interrupts enabled, it will sometimes hang when doing heavy
281 * reads. So better not enable them until I finger it out. */
282 if (instance->irq != SCSI_IRQ_NONE)
283 if (request_irq(instance->irq, dtc_intr, SA_INTERRUPT, "dtc", instance)) {
284 printk(KERN_ERR "scsi%d : IRQ%d not free, interrupts disabled\n", instance->host_no, instance->irq);
285 instance->irq = SCSI_IRQ_NONE;
286 }
287
288 if (instance->irq == SCSI_IRQ_NONE) {
289 printk(KERN_WARNING "scsi%d : interrupts not enabled. for better interactive performance,\n", instance->host_no);
290 printk(KERN_WARNING "scsi%d : please jumper the board for a free IRQ.\n", instance->host_no);
291 }
292#else
293 if (instance->irq != SCSI_IRQ_NONE)
294 printk(KERN_WARNING "scsi%d : interrupts not used. Might as well not jumper it.\n", instance->host_no);
295 instance->irq = SCSI_IRQ_NONE;
296#endif
297#if defined(DTCDEBUG) && (DTCDEBUG & DTCDEBUG_INIT)
298 printk("scsi%d : irq = %d\n", instance->host_no, instance->irq);
299#endif
300
301 printk(KERN_INFO "scsi%d : at 0x%05X", instance->host_no, (int) instance->base);
302 if (instance->irq == SCSI_IRQ_NONE)
303 printk(" interrupts disabled");
304 else
305 printk(" irq %d", instance->irq);
306 printk(" options CAN_QUEUE=%d CMD_PER_LUN=%d release=%d", CAN_QUEUE, CMD_PER_LUN, DTC_PUBLIC_RELEASE);
307 NCR5380_print_options(instance);
308 printk("\n");
309
310 ++current_override;
311 ++count;
312 }
313 return count;
314}
315
316/*
317 * Function : int dtc_biosparam(Disk * disk, struct block_device *dev, int *ip)
318 *
319 * Purpose : Generates a BIOS / DOS compatible H-C-S mapping for
320 * the specified device / size.
321 *
322 * Inputs : size = size of device in sectors (512 bytes), dev = block device
323 * major / minor, ip[] = {heads, sectors, cylinders}
324 *
325 * Returns : always 0 (success), initializes ip
326 *
327*/
328
329/*
330 * XXX Most SCSI boards use this mapping, I could be incorrect. Some one
331 * using hard disks on a trantor should verify that this mapping corresponds
332 * to that used by the BIOS / ASPI driver by running the linux fdisk program
333 * and matching the H_C_S coordinates to what DOS uses.
334*/
335
336static int dtc_biosparam(struct scsi_device *sdev, struct block_device *dev,
337 sector_t capacity, int *ip)
338{
339 int size = capacity;
340
341 ip[0] = 64;
342 ip[1] = 32;
343 ip[2] = size >> 11;
344 return 0;
345}
346
347
348/****************************************************************
349 * Function : int NCR5380_pread (struct Scsi_Host *instance,
350 * unsigned char *dst, int len)
351 *
352 * Purpose : Fast 5380 pseudo-dma read function, reads len bytes to
353 * dst
354 *
355 * Inputs : dst = destination, len = length in bytes
356 *
357 * Returns : 0 on success, non zero on a failure such as a watchdog
358 * timeout.
359*/
360
361static int dtc_maxi = 0;
362static int dtc_wmaxi = 0;
363
364static inline int NCR5380_pread(struct Scsi_Host *instance, unsigned char *dst, int len)
365{
366 unsigned char *d = dst;
367 int i; /* For counting time spent in the poll-loop */
368 NCR5380_local_declare();
369 NCR5380_setup(instance);
370
371 i = 0;
372 NCR5380_read(RESET_PARITY_INTERRUPT_REG);
373 NCR5380_write(MODE_REG, MR_ENABLE_EOP_INTR | MR_DMA_MODE);
374 if (instance->irq == SCSI_IRQ_NONE)
375 NCR5380_write(DTC_CONTROL_REG, CSR_DIR_READ);
376 else
377 NCR5380_write(DTC_CONTROL_REG, CSR_DIR_READ | CSR_INT_BASE);
378 NCR5380_write(DTC_BLK_CNT, len >> 7); /* Block count */
379 rtrc(1);
380 while (len > 0) {
381 rtrc(2);
382 while (NCR5380_read(DTC_CONTROL_REG) & CSR_HOST_BUF_NOT_RDY)
383 ++i;
384 rtrc(3);
385 memcpy_fromio(d, base + DTC_DATA_BUF, 128);
386 d += 128;
387 len -= 128;
388 rtrc(7);
389 /*** with int's on, it sometimes hangs after here.
390 * Looks like something makes HBNR go away. */
391 }
392 rtrc(4);
393 while (!(NCR5380_read(DTC_CONTROL_REG) & D_CR_ACCESS))
394 ++i;
395 NCR5380_write(MODE_REG, 0); /* Clear the operating mode */
396 rtrc(0);
397 NCR5380_read(RESET_PARITY_INTERRUPT_REG);
398 if (i > dtc_maxi)
399 dtc_maxi = i;
400 return (0);
401}
402
403/****************************************************************
404 * Function : int NCR5380_pwrite (struct Scsi_Host *instance,
405 * unsigned char *src, int len)
406 *
407 * Purpose : Fast 5380 pseudo-dma write function, transfers len bytes from
408 * src
409 *
410 * Inputs : src = source, len = length in bytes
411 *
412 * Returns : 0 on success, non zero on a failure such as a watchdog
413 * timeout.
414*/
415
416static inline int NCR5380_pwrite(struct Scsi_Host *instance, unsigned char *src, int len)
417{
418 int i;
419 NCR5380_local_declare();
420 NCR5380_setup(instance);
421
422 NCR5380_read(RESET_PARITY_INTERRUPT_REG);
423 NCR5380_write(MODE_REG, MR_ENABLE_EOP_INTR | MR_DMA_MODE);
424 /* set direction (write) */
425 if (instance->irq == SCSI_IRQ_NONE)
426 NCR5380_write(DTC_CONTROL_REG, 0);
427 else
428 NCR5380_write(DTC_CONTROL_REG, CSR_5380_INTR);
429 NCR5380_write(DTC_BLK_CNT, len >> 7); /* Block count */
430 for (i = 0; len > 0; ++i) {
431 rtrc(5);
432 /* Poll until the host buffer can accept data. */
433 while (NCR5380_read(DTC_CONTROL_REG) & CSR_HOST_BUF_NOT_RDY)
434 ++i;
435 rtrc(3);
436 memcpy_toio(base + DTC_DATA_BUF, src, 128);
437 src += 128;
438 len -= 128;
439 }
440 rtrc(4);
441 while (!(NCR5380_read(DTC_CONTROL_REG) & D_CR_ACCESS))
442 ++i;
443 rtrc(6);
444 /* Wait until the last byte has been sent to the disk */
445 while (!(NCR5380_read(TARGET_COMMAND_REG) & TCR_LAST_BYTE_SENT))
446 ++i;
447 rtrc(7);
448 /* Check for parity error here. fixme. */
449 NCR5380_write(MODE_REG, 0); /* Clear the operating mode */
450 rtrc(0);
451 if (i > dtc_wmaxi)
452 dtc_wmaxi = i;
453 return (0);
454}
455
456MODULE_LICENSE("GPL");
457
458#include "NCR5380.c"
459
460static int dtc_release(struct Scsi_Host *shost)
461{
462 NCR5380_local_declare();
463 NCR5380_setup(shost);
464 if (shost->irq)
465 free_irq(shost->irq, NULL);
466 NCR5380_exit(shost);
467 if (shost->io_port && shost->n_io_port)
468 release_region(shost->io_port, shost->n_io_port);
469 scsi_unregister(shost);
470 iounmap(base);
471 return 0;
472}
473
474static Scsi_Host_Template driver_template = {
475 .name = "DTC 3180/3280 ",
476 .detect = dtc_detect,
477 .release = dtc_release,
478 .queuecommand = dtc_queue_command,
479 .eh_abort_handler = dtc_abort,
480 .eh_bus_reset_handler = dtc_bus_reset,
481 .bios_param = dtc_biosparam,
482 .can_queue = CAN_QUEUE,
483 .this_id = 7,
484 .sg_tablesize = SG_ALL,
485 .cmd_per_lun = CMD_PER_LUN,
486 .use_clustering = DISABLE_CLUSTERING,
487};
488#include "scsi_module.c"