1 #define AUTOSENSE
2 #define PSEUDO_DMA
3 #define DONT_USE_INTR
4 #define UNSAFE /* Leave interrupts enabled during pseudo-dma I/O */
5 #define xNDEBUG (NDEBUG_INTR+NDEBUG_RESELECTION+\
6 NDEBUG_SELECTION+NDEBUG_ARBITRATION)
7 #define DMA_WORKS_RIGHT
8
9 /*
10 * DTC 3180/3280 driver, by
11 * Ray Van Tassle rayvt@comm.mot.com
12 *
13 * taken from ...
14 * Trantor T128/T128F/T228 driver by...
15 *
16 * Drew Eckhardt
17 * Visionary Computing
18 * (Unix and Linux consulting and custom programming)
19 * drew@colorado.edu
20 * +1 (303) 440-4894
21 *
22 * DISTRIBUTION RELEASE 1.
23 *
24 * For more information, please consult
25 *
26 * NCR 5380 Family
27 * SCSI Protocol Controller
28 * Databook
29 */
30
31 /*
32 * Options :
33 * AUTOSENSE - if defined, REQUEST SENSE will be performed automatically
34 * for commands that return with a CHECK CONDITION status.
35 *
36 * PSEUDO_DMA - enables PSEUDO-DMA hardware, should give a 3-4X performance
37 * increase compared to polled I/O.
38 *
39 * PARITY - enable parity checking. Not supported.
40 *
41 * UNSAFE - leave interrupts enabled during pseudo-DMA transfers.
42 * You probably want this.
43 *
44 * The card is detected and initialized in one of several ways :
45 * 1. Autoprobe (default) - since the board is memory mapped,
46 * a BIOS signature is scanned for to locate the registers.
47 * An interrupt is triggered to autoprobe for the interrupt
48 * line.
49 *
50 * 2. With command line overrides - dtc=address,irq may be
51 * used on the LILO command line to override the defaults.
52 *
53 */
54
55 /*----------------------------------------------------------------*/
56 /* the following will set the monitor border color (useful to find
57 where something crashed or gets stuck at */
58 /* 1 = blue
59 2 = green
60 3 = cyan
61 4 = red
62 5 = magenta
63 6 = yellow
64 7 = white
65 */
66
67 #if 0
68 #define rtrc(i) {inb(0x3da); outb(0x31, 0x3c0); outb((i), 0x3c0);}
69 #else
70 #define rtrc(i) {}
71 #endif
72
73
74 #include <asm/system.h>
75 #include <linux/module.h>
76 #include <linux/signal.h>
77 #include <linux/sched.h>
78 #include <linux/blk.h>
79 #include <asm/io.h>
80 #include "scsi.h"
81 #include "hosts.h"
82 #include "dtc.h"
83 #define AUTOPROBE_IRQ
84 #include "NCR5380.h"
85 #include "constants.h"
86 #include "sd.h"
87 #include <linux/stat.h>
88 #include <linux/string.h>
89 #include <linux/init.h>
90
91
92 #define DTC_PUBLIC_RELEASE 2
93
94 /*#define DTCDEBUG 0x1*/
95 #define DTCDEBUG_INIT 0x1
96 #define DTCDEBUG_TRANSFER 0x2
97
98 /*
99 * The DTC3180 & 3280 boards are memory mapped.
100 *
101 */
102
103 /*
104 */
105 /* Offset from DTC_5380_OFFSET */
106 #define DTC_CONTROL_REG 0x100 /* rw */
107 #define D_CR_ACCESS 0x80 /* ro set=can access 3280 registers */
108 #define CSR_DIR_READ 0x40 /* rw direction, 1 = read 0 = write */
109
110 #define CSR_RESET 0x80 /* wo Resets 53c400 */
111 #define CSR_5380_REG 0x80 /* ro 5380 registers can be accessed */
112 #define CSR_TRANS_DIR 0x40 /* rw Data transfer direction */
113 #define CSR_SCSI_BUFF_INTR 0x20 /* rw Enable int on transfer ready */
114 #define CSR_5380_INTR 0x10 /* rw Enable 5380 interrupts */
115 #define CSR_SHARED_INTR 0x08 /* rw Interrupt sharing */
116 #define CSR_HOST_BUF_NOT_RDY 0x04 /* ro Host buffer not ready */
117 #define CSR_SCSI_BUF_RDY 0x02 /* ro SCSI buffer ready */
118 #define CSR_GATED_5380_IRQ 0x01 /* ro Last block xferred */
119 #define CSR_INT_BASE (CSR_SCSI_BUFF_INTR | CSR_5380_INTR)
120
121
122 #define DTC_BLK_CNT 0x101 /* rw
123 * # of 128-byte blocks to transfer */
124
125
126 #define D_CR_ACCESS 0x80 /* ro set=can access 3280 registers */
127
128 #define DTC_SWITCH_REG 0x3982 /* ro - DIP switches */
129 #define DTC_RESUME_XFER 0x3982 /* wo - resume data xfer
130 * after disconnect/reconnect */
131
132 #define DTC_5380_OFFSET 0x3880 /* 8 registers here, see NCR5380.h */
133
134 /*!!!! for dtc, it's a 128 byte buffer at 3900 !!! */
135 #define DTC_DATA_BUF 0x3900 /* rw 128 bytes long */
136
137 static struct override {
138 unsigned int address;
139 int irq;
140 } overrides
141 #ifdef OVERRIDE
142 [] __initdata = OVERRIDE;
143 #else
144 [4] __initdata = {
145 {0, IRQ_AUTO},
146 {0, IRQ_AUTO},
147 {0, IRQ_AUTO},
148 {0, IRQ_AUTO}
149 };
150 #endif
151
152 #define NO_OVERRIDES (sizeof(overrides) / sizeof(struct override))
153
154 static struct base {
155 unsigned long address;
156 int noauto;
157 } bases[] __initdata = {
158 {0xcc000, 0},
159 {0xc8000, 0},
160 {0xdc000, 0},
161 {0xd8000, 0}
162 };
163
164 #define NO_BASES (sizeof (bases) / sizeof (struct base))
165
166 static const struct signature {
167 const char *string;
168 int offset;
169 } signatures[] = {
170 {"DATA TECHNOLOGY CORPORATION BIOS", 0x25},
171 };
172
173 #define NO_SIGNATURES (sizeof (signatures) / sizeof (struct signature))
174
175 /**
176 * dtc_setup - option setup for dtc3x80
177 *
178 * LILO command line initialization of the overrides array,
179 */
180
dtc_setup(char * str)181 static int __init dtc_setup(char *str)
182 {
183 static int commandline_current = 0;
184 int i;
185 int ints[10];
186
187 get_options(str, sizeof(ints) / sizeof(int), ints);
188
189 if (ints[0] != 2)
190 printk(KERN_ERR "dtc_setup: usage dtc=address,irq\n");
191 else if (commandline_current < NO_OVERRIDES) {
192 overrides[commandline_current].address = ints[1];
193 overrides[commandline_current].irq = ints[2];
194 for (i = 0; i < NO_BASES; ++i)
195 if (bases[i].address == ints[1]) {
196 bases[i].noauto = 1;
197 break;
198 }
199 ++commandline_current;
200 }
201 return 1;
202 }
203
204 __setup("dtc=", dtc_setup);
205
206 /**
207 * dtc_detect - detect DTC 3x80 controllers
208 * @tpnt: controller template
209 *
210 * Detects and initializes DTC 3180/3280 controllers
211 * that were autoprobed, overridden on the LILO command line,
212 * or specified at compile time.
213 */
214
dtc_detect(Scsi_Host_Template * tpnt)215 int __init dtc_detect(Scsi_Host_Template * tpnt)
216 {
217 static int current_override = 0, current_base = 0;
218 struct Scsi_Host *instance;
219 unsigned int 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 {
227 base = 0;
228
229 if (overrides[current_override].address)
230 base = overrides[current_override].address;
231 else
232 {
233 for (; !base && (current_base < NO_BASES); ++current_base) {
234 for (sig = 0; sig < NO_SIGNATURES; ++sig)
235 {
236 if (!bases[current_base].noauto && isa_check_signature(bases[current_base].address + signatures[sig].offset, signatures[sig].string, strlen(signatures[sig].string))) {
237 base = bases[current_base].address;
238 break;
239 }
240 }
241 }
242 }
243
244 if (!base)
245 break;
246
247 instance = scsi_register(tpnt, sizeof(struct NCR5380_hostdata));
248 if (instance == NULL)
249 break;
250
251 instance->base = base;
252
253 NCR5380_init(instance, 0);
254
255 NCR5380_write(DTC_CONTROL_REG, CSR_5380_INTR); /* Enable int's */
256 if (overrides[current_override].irq != IRQ_AUTO)
257 instance->irq = overrides[current_override].irq;
258 else
259 instance->irq = NCR5380_probe_irq(instance, DTC_IRQS);
260
261 #ifndef DONT_USE_INTR
262 /* With interrupts enabled, it will sometimes hang when doing heavy
263 * reads. So better not enable them until I figure it out. */
264 if (instance->irq != SCSI_IRQ_NONE)
265 if (request_irq(instance->irq, do_dtc_intr, SA_INTERRUPT, "dtc"))
266 {
267 printk(KERN_WARNING "scsi%d : IRQ%d not free, interrupts disabled\n", instance->host_no, instance->irq);
268 instance->irq = SCSI_IRQ_NONE;
269 }
270
271 if (instance->irq == SCSI_IRQ_NONE) {
272 printk(KERN_INFO "scsi%d : interrupts not enabled. for better interactive performance,\n", instance->host_no);
273 printk(KERN_INFO "scsi%d : please jumper the board for a free IRQ.\n", instance->host_no);
274 }
275 #else
276 if (instance->irq != SCSI_IRQ_NONE)
277 printk(KERN_INFO "scsi%d : interrupts not used. Might as well not jumper it.\n", instance->host_no);
278 instance->irq = SCSI_IRQ_NONE;
279 #endif
280 printk(KERN_INFO "scsi%d : at 0x%05X", instance->host_no, (int) instance->base);
281 if (instance->irq == SCSI_IRQ_NONE)
282 printk(" interrupts disabled");
283 else
284 printk(" irq %d", instance->irq);
285 printk(" options CAN_QUEUE=%d CMD_PER_LUN=%d release=%d", CAN_QUEUE, CMD_PER_LUN, DTC_PUBLIC_RELEASE);
286 NCR5380_print_options(instance);
287 printk("\n");
288
289 ++current_override;
290 ++count;
291 }
292 return count;
293 }
294
295 /**
296 * dtc_biosparam - compute disk geometry
297 * @disk: disk to generate for
298 * @dev: major/minor of device
299 * @ip: returned geometry
300 *
301 * Generates a BIOS / DOS compatible H-C-S mapping for
302 * the specified device / size.
303 */
304
dtc_biosparam(Disk * disk,kdev_t dev,int * ip)305 int dtc_biosparam(Disk * disk, kdev_t dev, int *ip)
306 {
307 int size = disk->capacity;
308
309 ip[0] = 64;
310 ip[1] = 32;
311 ip[2] = size >> 11;
312 return 0;
313 }
314
315
316 static int dtc_maxi = 0;
317 static int dtc_wmaxi = 0;
318
319 /**
320 * NCR5380_pread - fast pseudo DMA read
321 * @instance: controller
322 * @dst: destination buffer
323 * @len: expected/max size
324 *
325 * Fast 5380 pseudo-dma read function, reads len bytes from the controller
326 * mmio area into dst.
327 */
328
NCR5380_pread(struct Scsi_Host * instance,unsigned char * dst,int len)329 static inline int NCR5380_pread(struct Scsi_Host *instance, unsigned char *dst, int len)
330 {
331 unsigned char *d = dst;
332 int i; /* For counting time spent in the poll-loop */
333 NCR5380_local_declare();
334 NCR5380_setup(instance);
335
336 i = 0;
337 NCR5380_read(RESET_PARITY_INTERRUPT_REG);
338 NCR5380_write(MODE_REG, MR_ENABLE_EOP_INTR | MR_DMA_MODE);
339 if (instance->irq == SCSI_IRQ_NONE)
340 NCR5380_write(DTC_CONTROL_REG, CSR_DIR_READ);
341 else
342 NCR5380_write(DTC_CONTROL_REG, CSR_DIR_READ | CSR_INT_BASE);
343 NCR5380_write(DTC_BLK_CNT, len >> 7); /* Block count */
344 rtrc(1);
345 while (len > 0) {
346 rtrc(2);
347 while (NCR5380_read(DTC_CONTROL_REG) & CSR_HOST_BUF_NOT_RDY)
348 ++i;
349 rtrc(3);
350 isa_memcpy_fromio(d, base + DTC_DATA_BUF, 128);
351 d += 128;
352 len -= 128;
353 rtrc(7);
354 /*** with int's on, it sometimes hangs after here.
355 * Looks like something makes HBNR go away. */
356 }
357 rtrc(4);
358 while (!(NCR5380_read(DTC_CONTROL_REG) & D_CR_ACCESS))
359 ++i;
360 NCR5380_write(MODE_REG, 0); /* Clear the operating mode */
361 rtrc(0);
362 NCR5380_read(RESET_PARITY_INTERRUPT_REG);
363 if (i > dtc_maxi)
364 dtc_maxi = i;
365 return (0);
366 }
367
368 /**
369 * NCR5380_pwrite - fast pseudo DMA write
370 * @instance: controller
371 * @dst: destination buffer
372 * @len: expected/max size
373 *
374 * Fast 5380 pseudo-dma write function, writes len bytes to the
375 * controller mmio area from src.
376 */
377
NCR5380_pwrite(struct Scsi_Host * instance,unsigned char * src,int len)378 static inline int NCR5380_pwrite(struct Scsi_Host *instance, unsigned char *src, int len)
379 {
380 int i;
381 NCR5380_local_declare();
382 NCR5380_setup(instance);
383
384 NCR5380_read(RESET_PARITY_INTERRUPT_REG);
385 NCR5380_write(MODE_REG, MR_ENABLE_EOP_INTR | MR_DMA_MODE);
386 /* set direction (write) */
387 if (instance->irq == SCSI_IRQ_NONE)
388 NCR5380_write(DTC_CONTROL_REG, 0);
389 else
390 NCR5380_write(DTC_CONTROL_REG, CSR_5380_INTR);
391 NCR5380_write(DTC_BLK_CNT, len >> 7); /* Block count */
392 for (i = 0; len > 0; ++i) {
393 rtrc(5);
394 /* Poll until the host buffer can accept data. */
395 while (NCR5380_read(DTC_CONTROL_REG) & CSR_HOST_BUF_NOT_RDY)
396 ++i;
397 rtrc(3);
398 isa_memcpy_toio(base + DTC_DATA_BUF, src, 128);
399 src += 128;
400 len -= 128;
401 }
402 rtrc(4);
403 while (!(NCR5380_read(DTC_CONTROL_REG) & D_CR_ACCESS))
404 ++i;
405 rtrc(6);
406 /* Wait until the last byte has been sent to the disk */
407 while (!(NCR5380_read(TARGET_COMMAND_REG) & TCR_LAST_BYTE_SENT))
408 ++i;
409 rtrc(7);
410 /* Check for parity error here. fixme. */
411 NCR5380_write(MODE_REG, 0); /* Clear the operating mode */
412 rtrc(0);
413 if (i > dtc_wmaxi)
414 dtc_wmaxi = i;
415 return (0);
416 }
417
418 MODULE_LICENSE("GPL");
419
420 #include "NCR5380.c"
421
422 /* Eventually this will go into an include file, but this will be later */
423 static Scsi_Host_Template driver_template = DTC3x80;
424 #include "scsi_module.c"
425