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/blkdev.h>
79#include <linux/delay.h>
80#include <linux/stat.h>
81#include <linux/string.h>
82#include <linux/init.h>
83#include <linux/interrupt.h>
84#include <linux/io.h>
85#include "scsi.h"
86#include <scsi/scsi_host.h>
87#include "dtc.h"
88#define AUTOPROBE_IRQ
89#include "NCR5380.h"
90
91
92#define DTC_PUBLIC_RELEASE 2
93
94/*
95 * The DTC3180 & 3280 boards are memory mapped.
96 *
97 */
98
99/*
100 */
101/* Offset from DTC_5380_OFFSET */
102#define DTC_CONTROL_REG 0x100 /* rw */
103#define D_CR_ACCESS 0x80 /* ro set=can access 3280 registers */
104#define CSR_DIR_READ 0x40 /* rw direction, 1 = read 0 = write */
105
106#define CSR_RESET 0x80 /* wo Resets 53c400 */
107#define CSR_5380_REG 0x80 /* ro 5380 registers can be accessed */
108#define CSR_TRANS_DIR 0x40 /* rw Data transfer direction */
109#define CSR_SCSI_BUFF_INTR 0x20 /* rw Enable int on transfer ready */
110#define CSR_5380_INTR 0x10 /* rw Enable 5380 interrupts */
111#define CSR_SHARED_INTR 0x08 /* rw Interrupt sharing */
112#define CSR_HOST_BUF_NOT_RDY 0x04 /* ro Host buffer not ready */
113#define CSR_SCSI_BUF_RDY 0x02 /* ro SCSI buffer ready */
114#define CSR_GATED_5380_IRQ 0x01 /* ro Last block xferred */
115#define CSR_INT_BASE (CSR_SCSI_BUFF_INTR | CSR_5380_INTR)
116
117
118#define DTC_BLK_CNT 0x101 /* rw
119 * # of 128-byte blocks to transfer */
120
121
122#define D_CR_ACCESS 0x80 /* ro set=can access 3280 registers */
123
124#define DTC_SWITCH_REG 0x3982 /* ro - DIP switches */
125#define DTC_RESUME_XFER 0x3982 /* wo - resume data xfer
126 * after disconnect/reconnect*/
127
128#define DTC_5380_OFFSET 0x3880 /* 8 registers here, see NCR5380.h */
129
130/*!!!! for dtc, it's a 128 byte buffer at 3900 !!! */
131#define DTC_DATA_BUF 0x3900 /* rw 128 bytes long */
132
133static struct override {
134 unsigned int address;
135 int irq;
136} overrides
137#ifdef OVERRIDE
138[] __initdata = OVERRIDE;
139#else
140[4] __initdata = { {
1410, IRQ_AUTO}, {
1420, IRQ_AUTO}, {
1430, IRQ_AUTO}, {
1440, IRQ_AUTO}};
145#endif
146
147#define NO_OVERRIDES ARRAY_SIZE(overrides)
148
149static struct base {
150 unsigned long address;
151 int noauto;
152} bases[] __initdata = {
153 { 0xcc000, 0 },
154 { 0xc8000, 0 },
155 { 0xdc000, 0 },
156 { 0xd8000, 0 }
157};
158
159#define NO_BASES ARRAY_SIZE(bases)
160
161static const struct signature {
162 const char *string;
163 int offset;
164} signatures[] = {
165 {"DATA TECHNOLOGY CORPORATION BIOS", 0x25},
166};
167
168#define NO_SIGNATURES ARRAY_SIZE(signatures)
169
170#ifndef MODULE
171/*
172 * Function : dtc_setup(char *str, int *ints)
173 *
174 * Purpose : LILO command line initialization of the overrides array,
175 *
176 * Inputs : str - unused, ints - array of integer parameters with ints[0]
177 * equal to the number of ints.
178 *
179*/
180
181static void __init dtc_setup(char *str, int *ints)
182{
183 static int commandline_current = 0;
184 int i;
185 if (ints[0] != 2)
186 printk("dtc_setup: usage dtc=address,irq\n");
187 else if (commandline_current < NO_OVERRIDES) {
188 overrides[commandline_current].address = ints[1];
189 overrides[commandline_current].irq = ints[2];
190 for (i = 0; i < NO_BASES; ++i)
191 if (bases[i].address == ints[1]) {
192 bases[i].noauto = 1;
193 break;
194 }
195 ++commandline_current;
196 }
197}
198#endif
199
200/*
201 * Function : int dtc_detect(struct scsi_host_template * tpnt)
202 *
203 * Purpose : detects and initializes DTC 3180/3280 controllers
204 * that were autoprobed, overridden on the LILO command line,
205 * or specified at compile time.
206 *
207 * Inputs : tpnt - template for this SCSI adapter.
208 *
209 * Returns : 1 if a host adapter was found, 0 if not.
210 *
211*/
212
213static int __init dtc_detect(struct scsi_host_template * tpnt)
214{
215 static int current_override = 0, current_base = 0;
216 struct Scsi_Host *instance;
217 unsigned int addr;
218 void __iomem *base;
219 int sig, count;
220
221 tpnt->proc_name = "dtc3x80";
222 tpnt->proc_info = &dtc_proc_info;
223
224 for (count = 0; current_override < NO_OVERRIDES; ++current_override) {
225 addr = 0;
226 base = NULL;
227
228 if (overrides[current_override].address) {
229 addr = overrides[current_override].address;
230 base = ioremap(addr, 0x2000);
231 if (!base)
232 addr = 0;
233 } else
234 for (; !addr && (current_base < NO_BASES); ++current_base) {
235#if (DTCDEBUG & DTCDEBUG_INIT)
236 printk("scsi-dtc : probing address %08x\n", bases[current_base].address);
237#endif
238 if (bases[current_base].noauto)
239 continue;
240 base = ioremap(bases[current_base].address, 0x2000);
241 if (!base)
242 continue;
243 for (sig = 0; sig < NO_SIGNATURES; ++sig) {
244 if (check_signature(base + signatures[sig].offset, signatures[sig].string, strlen(signatures[sig].string))) {
245 addr = bases[current_base].address;
246#if (DTCDEBUG & DTCDEBUG_INIT)
247 printk("scsi-dtc : detected board.\n");
248#endif
249 goto found;
250 }
251 }
252 iounmap(base);
253 }
254
255#if defined(DTCDEBUG) && (DTCDEBUG & DTCDEBUG_INIT)
256 printk("scsi-dtc : base = %08x\n", addr);
257#endif
258
259 if (!addr)
260 break;
261
262found:
263 instance = scsi_register(tpnt, sizeof(struct NCR5380_hostdata));
264 if (instance == NULL)
265 break;
266
267 instance->base = addr;
268 ((struct NCR5380_hostdata *)(instance)->hostdata)->base = base;
269
270 NCR5380_init(instance, 0);
271
272 NCR5380_write(DTC_CONTROL_REG, CSR_5380_INTR); /* Enable int's */
273 if (overrides[current_override].irq != IRQ_AUTO)
274 instance->irq = overrides[current_override].irq;
275 else
276 instance->irq = NCR5380_probe_irq(instance, DTC_IRQS);
277
278#ifndef DONT_USE_INTR
279 /* With interrupts enabled, it will sometimes hang when doing heavy
280 * reads. So better not enable them until I finger it out. */
281 if (instance->irq != SCSI_IRQ_NONE)
282 if (request_irq(instance->irq, dtc_intr, IRQF_DISABLED, "dtc", instance)) {
283 printk(KERN_ERR "scsi%d : IRQ%d not free, interrupts disabled\n", instance->host_no, instance->irq);
284 instance->irq = SCSI_IRQ_NONE;
285 }
286
287 if (instance->irq == SCSI_IRQ_NONE) {
288 printk(KERN_WARNING "scsi%d : interrupts not enabled. for better interactive performance,\n", instance->host_no);
289 printk(KERN_WARNING "scsi%d : please jumper the board for a free IRQ.\n", instance->host_no);
290 }
291#else
292 if (instance->irq != SCSI_IRQ_NONE)
293 printk(KERN_WARNING "scsi%d : interrupts not used. Might as well not jumper it.\n", instance->host_no);
294 instance->irq = SCSI_IRQ_NONE;
295#endif
296#if defined(DTCDEBUG) && (DTCDEBUG & DTCDEBUG_INIT)
297 printk("scsi%d : irq = %d\n", instance->host_no, instance->irq);
298#endif
299
300 printk(KERN_INFO "scsi%d : at 0x%05X", instance->host_no, (int) instance->base);
301 if (instance->irq == SCSI_IRQ_NONE)
302 printk(" interrupts disabled");
303 else
304 printk(" irq %d", instance->irq);
305 printk(" options CAN_QUEUE=%d CMD_PER_LUN=%d release=%d", CAN_QUEUE, CMD_PER_LUN, DTC_PUBLIC_RELEASE);
306 NCR5380_print_options(instance);
307 printk("\n");
308
309 ++current_override;
310 ++count;
311 }
312 return count;
313}
314
315/*
316 * Function : int dtc_biosparam(Disk * disk, struct block_device *dev, int *ip)
317 *
318 * Purpose : Generates a BIOS / DOS compatible H-C-S mapping for
319 * the specified device / size.
320 *
321 * Inputs : size = size of device in sectors (512 bytes), dev = block device
322 * major / minor, ip[] = {heads, sectors, cylinders}
323 *
324 * Returns : always 0 (success), initializes ip
325 *
326*/
327
328/*
329 * XXX Most SCSI boards use this mapping, I could be incorrect. Some one
330 * using hard disks on a trantor should verify that this mapping corresponds
331 * to that used by the BIOS / ASPI driver by running the linux fdisk program
332 * and matching the H_C_S coordinates to what DOS uses.
333*/
334
335static int dtc_biosparam(struct scsi_device *sdev, struct block_device *dev,
336 sector_t capacity, int *ip)
337{
338 int size = capacity;
339
340 ip[0] = 64;
341 ip[1] = 32;
342 ip[2] = size >> 11;
343 return 0;
344}
345
346
347/****************************************************************
348 * Function : int NCR5380_pread (struct Scsi_Host *instance,
349 * unsigned char *dst, int len)
350 *
351 * Purpose : Fast 5380 pseudo-dma read function, reads len bytes to
352 * dst
353 *
354 * Inputs : dst = destination, len = length in bytes
355 *
356 * Returns : 0 on success, non zero on a failure such as a watchdog
357 * timeout.
358*/
359
360static int dtc_maxi = 0;
361static int dtc_wmaxi = 0;
362
363static inline int NCR5380_pread(struct Scsi_Host *instance, unsigned char *dst, int len)
364{
365 unsigned char *d = dst;
366 int i; /* For counting time spent in the poll-loop */
367 NCR5380_local_declare();
368 NCR5380_setup(instance);
369
370 i = 0;
371 NCR5380_read(RESET_PARITY_INTERRUPT_REG);
372 NCR5380_write(MODE_REG, MR_ENABLE_EOP_INTR | MR_DMA_MODE);
373 if (instance->irq == SCSI_IRQ_NONE)
374 NCR5380_write(DTC_CONTROL_REG, CSR_DIR_READ);
375 else
376 NCR5380_write(DTC_CONTROL_REG, CSR_DIR_READ | CSR_INT_BASE);
377 NCR5380_write(DTC_BLK_CNT, len >> 7); /* Block count */
378 rtrc(1);
379 while (len > 0) {
380 rtrc(2);
381 while (NCR5380_read(DTC_CONTROL_REG) & CSR_HOST_BUF_NOT_RDY)
382 ++i;
383 rtrc(3);
384 memcpy_fromio(d, base + DTC_DATA_BUF, 128);
385 d += 128;
386 len -= 128;
387 rtrc(7);
388 /*** with int's on, it sometimes hangs after here.
389 * Looks like something makes HBNR go away. */
390 }
391 rtrc(4);
392 while (!(NCR5380_read(DTC_CONTROL_REG) & D_CR_ACCESS))
393 ++i;
394 NCR5380_write(MODE_REG, 0); /* Clear the operating mode */
395 rtrc(0);
396 NCR5380_read(RESET_PARITY_INTERRUPT_REG);
397 if (i > dtc_maxi)
398 dtc_maxi = i;
399 return (0);
400}
401
402/****************************************************************
403 * Function : int NCR5380_pwrite (struct Scsi_Host *instance,
404 * unsigned char *src, int len)
405 *
406 * Purpose : Fast 5380 pseudo-dma write function, transfers len bytes from
407 * src
408 *
409 * Inputs : src = source, len = length in bytes
410 *
411 * Returns : 0 on success, non zero on a failure such as a watchdog
412 * timeout.
413*/
414
415static inline int NCR5380_pwrite(struct Scsi_Host *instance, unsigned char *src, int len)
416{
417 int i;
418 NCR5380_local_declare();
419 NCR5380_setup(instance);
420
421 NCR5380_read(RESET_PARITY_INTERRUPT_REG);
422 NCR5380_write(MODE_REG, MR_ENABLE_EOP_INTR | MR_DMA_MODE);
423 /* set direction (write) */
424 if (instance->irq == SCSI_IRQ_NONE)
425 NCR5380_write(DTC_CONTROL_REG, 0);
426 else
427 NCR5380_write(DTC_CONTROL_REG, CSR_5380_INTR);
428 NCR5380_write(DTC_BLK_CNT, len >> 7); /* Block count */
429 for (i = 0; len > 0; ++i) {
430 rtrc(5);
431 /* Poll until the host buffer can accept data. */
432 while (NCR5380_read(DTC_CONTROL_REG) & CSR_HOST_BUF_NOT_RDY)
433 ++i;
434 rtrc(3);
435 memcpy_toio(base + DTC_DATA_BUF, src, 128);
436 src += 128;
437 len -= 128;
438 }
439 rtrc(4);
440 while (!(NCR5380_read(DTC_CONTROL_REG) & D_CR_ACCESS))
441 ++i;
442 rtrc(6);
443 /* Wait until the last byte has been sent to the disk */
444 while (!(NCR5380_read(TARGET_COMMAND_REG) & TCR_LAST_BYTE_SENT))
445 ++i;
446 rtrc(7);
447 /* Check for parity error here. fixme. */
448 NCR5380_write(MODE_REG, 0); /* Clear the operating mode */
449 rtrc(0);
450 if (i > dtc_wmaxi)
451 dtc_wmaxi = i;
452 return (0);
453}
454
455MODULE_LICENSE("GPL");
456
457#include "NCR5380.c"
458
459static int dtc_release(struct Scsi_Host *shost)
460{
461 NCR5380_local_declare();
462 NCR5380_setup(shost);
463 if (shost->irq)
464 free_irq(shost->irq, NULL);
465 NCR5380_exit(shost);
466 if (shost->io_port && shost->n_io_port)
467 release_region(shost->io_port, shost->n_io_port);
468 scsi_unregister(shost);
469 iounmap(base);
470 return 0;
471}
472
473static struct scsi_host_template driver_template = {
474 .name = "DTC 3180/3280 ",
475 .detect = dtc_detect,
476 .release = dtc_release,
477 .queuecommand = dtc_queue_command,
478 .eh_abort_handler = dtc_abort,
479 .eh_bus_reset_handler = dtc_bus_reset,
480 .bios_param = dtc_biosparam,
481 .can_queue = CAN_QUEUE,
482 .this_id = 7,
483 .sg_tablesize = SG_ALL,
484 .cmd_per_lun = CMD_PER_LUN,
485 .use_clustering = DISABLE_CLUSTERING,
486};
487#include "scsi_module.c"