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1#define PSEUDO_DMA
2#define DONT_USE_INTR
3
4/*
5 * DTC 3180/3280 driver, by
6 * Ray Van Tassle rayvt@comm.mot.com
7 *
8 * taken from ...
9 * Trantor T128/T128F/T228 driver by...
10 *
11 * Drew Eckhardt
12 * Visionary Computing
13 * (Unix and Linux consulting and custom programming)
14 * drew@colorado.edu
15 * +1 (303) 440-4894
16 */
17
18/*
19 * The card is detected and initialized in one of several ways :
20 * 1. Autoprobe (default) - since the board is memory mapped,
21 * a BIOS signature is scanned for to locate the registers.
22 * An interrupt is triggered to autoprobe for the interrupt
23 * line.
24 *
25 * 2. With command line overrides - dtc=address,irq may be
26 * used on the LILO command line to override the defaults.
27 *
28*/
29
30/*----------------------------------------------------------------*/
31/* the following will set the monitor border color (useful to find
32 where something crashed or gets stuck at */
33/* 1 = blue
34 2 = green
35 3 = cyan
36 4 = red
37 5 = magenta
38 6 = yellow
39 7 = white
40*/
41#if 0
42#define rtrc(i) {inb(0x3da); outb(0x31, 0x3c0); outb((i), 0x3c0);}
43#else
44#define rtrc(i) {}
45#endif
46
47
48#include <linux/module.h>
49#include <linux/blkdev.h>
50#include <linux/string.h>
51#include <linux/init.h>
52#include <linux/interrupt.h>
53#include <linux/io.h>
54#include <scsi/scsi_host.h>
55
56#include "dtc.h"
57#define AUTOPROBE_IRQ
58#include "NCR5380.h"
59
60/*
61 * The DTC3180 & 3280 boards are memory mapped.
62 *
63 */
64
65/*
66 */
67/* Offset from DTC_5380_OFFSET */
68#define DTC_CONTROL_REG 0x100 /* rw */
69#define D_CR_ACCESS 0x80 /* ro set=can access 3280 registers */
70#define CSR_DIR_READ 0x40 /* rw direction, 1 = read 0 = write */
71
72#define CSR_RESET 0x80 /* wo Resets 53c400 */
73#define CSR_5380_REG 0x80 /* ro 5380 registers can be accessed */
74#define CSR_TRANS_DIR 0x40 /* rw Data transfer direction */
75#define CSR_SCSI_BUFF_INTR 0x20 /* rw Enable int on transfer ready */
76#define CSR_5380_INTR 0x10 /* rw Enable 5380 interrupts */
77#define CSR_SHARED_INTR 0x08 /* rw Interrupt sharing */
78#define CSR_HOST_BUF_NOT_RDY 0x04 /* ro Host buffer not ready */
79#define CSR_SCSI_BUF_RDY 0x02 /* ro SCSI buffer ready */
80#define CSR_GATED_5380_IRQ 0x01 /* ro Last block xferred */
81#define CSR_INT_BASE (CSR_SCSI_BUFF_INTR | CSR_5380_INTR)
82
83
84#define DTC_BLK_CNT 0x101 /* rw
85 * # of 128-byte blocks to transfer */
86
87
88#define D_CR_ACCESS 0x80 /* ro set=can access 3280 registers */
89
90#define DTC_SWITCH_REG 0x3982 /* ro - DIP switches */
91#define DTC_RESUME_XFER 0x3982 /* wo - resume data xfer
92 * after disconnect/reconnect*/
93
94#define DTC_5380_OFFSET 0x3880 /* 8 registers here, see NCR5380.h */
95
96/*!!!! for dtc, it's a 128 byte buffer at 3900 !!! */
97#define DTC_DATA_BUF 0x3900 /* rw 128 bytes long */
98
99static struct override {
100 unsigned int address;
101 int irq;
102} overrides
103#ifdef OVERRIDE
104[] __initdata = OVERRIDE;
105#else
106[4] __initdata = {
107 { 0, IRQ_AUTO }, { 0, IRQ_AUTO }, { 0, IRQ_AUTO }, { 0, IRQ_AUTO }
108};
109#endif
110
111#define NO_OVERRIDES ARRAY_SIZE(overrides)
112
113static struct base {
114 unsigned long address;
115 int noauto;
116} bases[] __initdata = {
117 { 0xcc000, 0 },
118 { 0xc8000, 0 },
119 { 0xdc000, 0 },
120 { 0xd8000, 0 }
121};
122
123#define NO_BASES ARRAY_SIZE(bases)
124
125static const struct signature {
126 const char *string;
127 int offset;
128} signatures[] = {
129 {"DATA TECHNOLOGY CORPORATION BIOS", 0x25},
130};
131
132#define NO_SIGNATURES ARRAY_SIZE(signatures)
133
134#ifndef MODULE
135/*
136 * Function : dtc_setup(char *str, int *ints)
137 *
138 * Purpose : LILO command line initialization of the overrides array,
139 *
140 * Inputs : str - unused, ints - array of integer parameters with ints[0]
141 * equal to the number of ints.
142 *
143 */
144
145static int __init dtc_setup(char *str)
146{
147 static int commandline_current;
148 int i;
149 int ints[10];
150
151 get_options(str, ARRAY_SIZE(ints), ints);
152 if (ints[0] != 2)
153 printk("dtc_setup: usage dtc=address,irq\n");
154 else if (commandline_current < NO_OVERRIDES) {
155 overrides[commandline_current].address = ints[1];
156 overrides[commandline_current].irq = ints[2];
157 for (i = 0; i < NO_BASES; ++i)
158 if (bases[i].address == ints[1]) {
159 bases[i].noauto = 1;
160 break;
161 }
162 ++commandline_current;
163 }
164 return 1;
165}
166
167__setup("dtc=", dtc_setup);
168#endif
169
170/*
171 * Function : int dtc_detect(struct scsi_host_template * tpnt)
172 *
173 * Purpose : detects and initializes DTC 3180/3280 controllers
174 * that were autoprobed, overridden on the LILO command line,
175 * or specified at compile time.
176 *
177 * Inputs : tpnt - template for this SCSI adapter.
178 *
179 * Returns : 1 if a host adapter was found, 0 if not.
180 *
181*/
182
183static int __init dtc_detect(struct scsi_host_template * tpnt)
184{
185 static int current_override, current_base;
186 struct Scsi_Host *instance;
187 unsigned int addr;
188 void __iomem *base;
189 int sig, count;
190
191 for (count = 0; current_override < NO_OVERRIDES; ++current_override) {
192 addr = 0;
193 base = NULL;
194
195 if (overrides[current_override].address) {
196 addr = overrides[current_override].address;
197 base = ioremap(addr, 0x2000);
198 if (!base)
199 addr = 0;
200 } else
201 for (; !addr && (current_base < NO_BASES); ++current_base) {
202 dprintk(NDEBUG_INIT, "dtc: probing address 0x%08x\n",
203 (unsigned int)bases[current_base].address);
204 if (bases[current_base].noauto)
205 continue;
206 base = ioremap(bases[current_base].address, 0x2000);
207 if (!base)
208 continue;
209 for (sig = 0; sig < NO_SIGNATURES; ++sig) {
210 if (check_signature(base + signatures[sig].offset, signatures[sig].string, strlen(signatures[sig].string))) {
211 addr = bases[current_base].address;
212 dprintk(NDEBUG_INIT, "dtc: detected board\n");
213 goto found;
214 }
215 }
216 iounmap(base);
217 }
218
219 dprintk(NDEBUG_INIT, "dtc: addr = 0x%08x\n", addr);
220
221 if (!addr)
222 break;
223
224found:
225 instance = scsi_register(tpnt, sizeof(struct NCR5380_hostdata));
226 if (instance == NULL)
227 goto out_unmap;
228
229 instance->base = addr;
230 ((struct NCR5380_hostdata *)(instance)->hostdata)->base = base;
231
232 if (NCR5380_init(instance, FLAG_NO_DMA_FIXUP))
233 goto out_unregister;
234
235 NCR5380_maybe_reset_bus(instance);
236
237 NCR5380_write(DTC_CONTROL_REG, CSR_5380_INTR); /* Enable int's */
238 if (overrides[current_override].irq != IRQ_AUTO)
239 instance->irq = overrides[current_override].irq;
240 else
241 instance->irq = NCR5380_probe_irq(instance, DTC_IRQS);
242
243 /* Compatibility with documented NCR5380 kernel parameters */
244 if (instance->irq == 255)
245 instance->irq = NO_IRQ;
246
247#ifndef DONT_USE_INTR
248 /* With interrupts enabled, it will sometimes hang when doing heavy
249 * reads. So better not enable them until I finger it out. */
250 if (instance->irq != NO_IRQ)
251 if (request_irq(instance->irq, dtc_intr, 0,
252 "dtc", instance)) {
253 printk(KERN_ERR "scsi%d : IRQ%d not free, interrupts disabled\n", instance->host_no, instance->irq);
254 instance->irq = NO_IRQ;
255 }
256
257 if (instance->irq == NO_IRQ) {
258 printk(KERN_WARNING "scsi%d : interrupts not enabled. for better interactive performance,\n", instance->host_no);
259 printk(KERN_WARNING "scsi%d : please jumper the board for a free IRQ.\n", instance->host_no);
260 }
261#else
262 if (instance->irq != NO_IRQ)
263 printk(KERN_WARNING "scsi%d : interrupts not used. Might as well not jumper it.\n", instance->host_no);
264 instance->irq = NO_IRQ;
265#endif
266 dprintk(NDEBUG_INIT, "scsi%d : irq = %d\n",
267 instance->host_no, instance->irq);
268
269 ++current_override;
270 ++count;
271 }
272 return count;
273
274out_unregister:
275 scsi_unregister(instance);
276out_unmap:
277 iounmap(base);
278 return count;
279}
280
281/*
282 * Function : int dtc_biosparam(Disk * disk, struct block_device *dev, int *ip)
283 *
284 * Purpose : Generates a BIOS / DOS compatible H-C-S mapping for
285 * the specified device / size.
286 *
287 * Inputs : size = size of device in sectors (512 bytes), dev = block device
288 * major / minor, ip[] = {heads, sectors, cylinders}
289 *
290 * Returns : always 0 (success), initializes ip
291 *
292*/
293
294/*
295 * XXX Most SCSI boards use this mapping, I could be incorrect. Some one
296 * using hard disks on a trantor should verify that this mapping corresponds
297 * to that used by the BIOS / ASPI driver by running the linux fdisk program
298 * and matching the H_C_S coordinates to what DOS uses.
299*/
300
301static int dtc_biosparam(struct scsi_device *sdev, struct block_device *dev,
302 sector_t capacity, int *ip)
303{
304 int size = capacity;
305
306 ip[0] = 64;
307 ip[1] = 32;
308 ip[2] = size >> 11;
309 return 0;
310}
311
312
313/****************************************************************
314 * Function : int NCR5380_pread (struct Scsi_Host *instance,
315 * unsigned char *dst, int len)
316 *
317 * Purpose : Fast 5380 pseudo-dma read function, reads len bytes to
318 * dst
319 *
320 * Inputs : dst = destination, len = length in bytes
321 *
322 * Returns : 0 on success, non zero on a failure such as a watchdog
323 * timeout.
324*/
325
326static inline int NCR5380_pread(struct Scsi_Host *instance, unsigned char *dst, int len)
327{
328 unsigned char *d = dst;
329 int i; /* For counting time spent in the poll-loop */
330 struct NCR5380_hostdata *hostdata = shost_priv(instance);
331
332 i = 0;
333 if (instance->irq == NO_IRQ)
334 NCR5380_write(DTC_CONTROL_REG, CSR_DIR_READ);
335 else
336 NCR5380_write(DTC_CONTROL_REG, CSR_DIR_READ | CSR_INT_BASE);
337 NCR5380_write(DTC_BLK_CNT, len >> 7); /* Block count */
338 rtrc(1);
339 while (len > 0) {
340 rtrc(2);
341 while (NCR5380_read(DTC_CONTROL_REG) & CSR_HOST_BUF_NOT_RDY)
342 ++i;
343 rtrc(3);
344 memcpy_fromio(d, hostdata->base + DTC_DATA_BUF, 128);
345 d += 128;
346 len -= 128;
347 rtrc(7);
348 /*** with int's on, it sometimes hangs after here.
349 * Looks like something makes HBNR go away. */
350 }
351 rtrc(4);
352 while (!(NCR5380_read(DTC_CONTROL_REG) & D_CR_ACCESS))
353 ++i;
354 rtrc(0);
355 if (i > hostdata->spin_max_r)
356 hostdata->spin_max_r = i;
357 return (0);
358}
359
360/****************************************************************
361 * Function : int NCR5380_pwrite (struct Scsi_Host *instance,
362 * unsigned char *src, int len)
363 *
364 * Purpose : Fast 5380 pseudo-dma write function, transfers len bytes from
365 * src
366 *
367 * Inputs : src = source, len = length in bytes
368 *
369 * Returns : 0 on success, non zero on a failure such as a watchdog
370 * timeout.
371*/
372
373static inline int NCR5380_pwrite(struct Scsi_Host *instance, unsigned char *src, int len)
374{
375 int i;
376 struct NCR5380_hostdata *hostdata = shost_priv(instance);
377
378 if (instance->irq == NO_IRQ)
379 NCR5380_write(DTC_CONTROL_REG, 0);
380 else
381 NCR5380_write(DTC_CONTROL_REG, CSR_5380_INTR);
382 NCR5380_write(DTC_BLK_CNT, len >> 7); /* Block count */
383 for (i = 0; len > 0; ++i) {
384 rtrc(5);
385 /* Poll until the host buffer can accept data. */
386 while (NCR5380_read(DTC_CONTROL_REG) & CSR_HOST_BUF_NOT_RDY)
387 ++i;
388 rtrc(3);
389 memcpy_toio(hostdata->base + DTC_DATA_BUF, src, 128);
390 src += 128;
391 len -= 128;
392 }
393 rtrc(4);
394 while (!(NCR5380_read(DTC_CONTROL_REG) & D_CR_ACCESS))
395 ++i;
396 rtrc(6);
397 /* Wait until the last byte has been sent to the disk */
398 while (!(NCR5380_read(TARGET_COMMAND_REG) & TCR_LAST_BYTE_SENT))
399 ++i;
400 rtrc(7);
401 /* Check for parity error here. fixme. */
402 rtrc(0);
403 if (i > hostdata->spin_max_w)
404 hostdata->spin_max_w = i;
405 return (0);
406}
407
408static int dtc_dma_xfer_len(struct scsi_cmnd *cmd)
409{
410 int transfersize = cmd->transfersize;
411
412 /* Limit transfers to 32K, for xx400 & xx406
413 * pseudoDMA that transfers in 128 bytes blocks.
414 */
415 if (transfersize > 32 * 1024 && cmd->SCp.this_residual &&
416 !(cmd->SCp.this_residual % transfersize))
417 transfersize = 32 * 1024;
418
419 return transfersize;
420}
421
422MODULE_LICENSE("GPL");
423
424#include "NCR5380.c"
425
426static int dtc_release(struct Scsi_Host *shost)
427{
428 struct NCR5380_hostdata *hostdata = shost_priv(shost);
429
430 if (shost->irq != NO_IRQ)
431 free_irq(shost->irq, shost);
432 NCR5380_exit(shost);
433 scsi_unregister(shost);
434 iounmap(hostdata->base);
435 return 0;
436}
437
438static struct scsi_host_template driver_template = {
439 .name = "DTC 3180/3280",
440 .detect = dtc_detect,
441 .release = dtc_release,
442 .proc_name = "dtc3x80",
443 .show_info = dtc_show_info,
444 .write_info = dtc_write_info,
445 .info = dtc_info,
446 .queuecommand = dtc_queue_command,
447 .eh_abort_handler = dtc_abort,
448 .eh_bus_reset_handler = dtc_bus_reset,
449 .bios_param = dtc_biosparam,
450 .can_queue = 32,
451 .this_id = 7,
452 .sg_tablesize = SG_ALL,
453 .cmd_per_lun = 2,
454 .use_clustering = DISABLE_CLUSTERING,
455 .cmd_size = NCR5380_CMD_SIZE,
456 .max_sectors = 128,
457};
458#include "scsi_module.c"