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