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[/] [or1k_old/] [trunk/] [uclinux/] [uClinux-2.0.x/] [drivers/] [scsi/] [dtc.c] - Blame information for rev 1782

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Line No. Rev Author Line
1 199 simons
 
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/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
 
90
struct proc_dir_entry proc_scsi_dtc = {
91
   PROC_SCSI_T128, 7, "dtc3x80",
92
        S_IFDIR | S_IRUGO | S_IXUGO, 2
93
     };
94
 
95
 
96
static struct override {
97
   __u32 address;
98
   int irq;
99
} overrides
100
#ifdef OVERRIDE
101
[] = OVERRIDE;
102
#else
103
[4] = {{0, IRQ_AUTO}, {0, IRQ_AUTO}, {0, IRQ_AUTO},
104
       {0, IRQ_AUTO}};
105
#endif
106
 
107
#define NO_OVERRIDES (sizeof(overrides) / sizeof(struct override))
108
 
109
static struct base {
110
   __u32 address;
111
   int noauto;
112
} bases[] = {{0xcc000, 0}, {0xc8000, 0},
113
{0xdc000, 0}, {0xd8000, 0}};
114
 
115
#define NO_BASES (sizeof (bases) / sizeof (struct base))
116
 
117
static const struct signature {
118
   const char *string;
119
   int offset;
120
} signatures[] = { {"DATA TECHNOLOGY CORPORATION BIOS", 0x25}, };
121
 
122
#define NO_SIGNATURES (sizeof (signatures) /  sizeof (struct signature))
123
 
124
/*
125
 * Function : dtc_setup(char *str, int *ints)
126
 *
127
 * Purpose : LILO command line initialization of the overrides array,
128
 *
129
 * Inputs : str - unused, ints - array of integer parameters with ints[0]
130
 *      equal to the number of ints.
131
 *
132
*/
133
 
134
void dtc_setup(char *str, int *ints) {
135
   static int commandline_current = 0;
136
   int i;
137
   if (ints[0] != 2)
138
      printk("dtc_setup: usage dtc=address,irq\n");
139
   else
140
      if (commandline_current < NO_OVERRIDES) {
141
      overrides[commandline_current].address = ints[1];
142
      overrides[commandline_current].irq = ints[2];
143
      for (i = 0; i < NO_BASES; ++i)
144
         if (bases[i].address == ints[1]) {
145
         bases[i].noauto = 1;
146
         break;
147
      }
148
      ++commandline_current;
149
   }
150
}
151
 
152
/*
153
 * Function : int dtc_detect(Scsi_Host_Template * tpnt)
154
 *
155
 * Purpose : detects and initializes DTC 3180/3280 controllers
156
 *      that were autoprobed, overridden on the LILO command line,
157
 *      or specified at compile time.
158
 *
159
 * Inputs : tpnt - template for this SCSI adapter.
160
 *
161
 * Returns : 1 if a host adapter was found, 0 if not.
162
 *
163
*/
164
 
165
 
166
int dtc_detect(Scsi_Host_Template * tpnt) {
167
   static int current_override = 0, current_base = 0;
168
   struct Scsi_Host *instance;
169
   unsigned char *base;
170
   int sig, count;
171
 
172
   tpnt->proc_dir = &proc_scsi_dtc;
173
   tpnt->proc_info = &dtc_proc_info;
174
 
175
   for (count = 0; current_override < NO_OVERRIDES; ++current_override) {
176
      base = NULL;
177
 
178
      if (overrides[current_override].address)
179
         base = (unsigned char *)overrides[current_override].address;
180
      else
181
         for (; !base && (current_base < NO_BASES); ++current_base) {
182
#if (DTCDEBUG & DTCDEBUG_INIT)
183
         printk("scsi : probing address %08x\n", (unsigned int) bases[current_base].address);
184
#endif
185
         for (sig = 0; sig < NO_SIGNATURES; ++sig)
186
            if (!bases[current_base].noauto && !memcmp
187
              ((unsigned char *)(bases[current_base].address + signatures[sig].offset),
188
              signatures[sig].string, strlen(signatures[sig].string))) {
189
            base = (unsigned char *)bases[current_base].address;
190
#if (DTCDEBUG & DTCDEBUG_INIT)
191
            printk("scsi-dtc : detected board.\n");
192
#endif
193
            break;
194
         }
195
      }
196
 
197
#if defined(DTCDEBUG) && (DTCDEBUG & DTCDEBUG_INIT)
198
      printk("scsi-dtc : base = %08x\n", (unsigned int) base);
199
#endif
200
 
201
      if (!base)
202
         break;
203
 
204
      instance = scsi_register (tpnt, sizeof(struct NCR5380_hostdata));
205
      instance->base = base;
206
 
207
      NCR5380_init(instance, 0);
208
 
209
      NCR5380_write(DTC_CONTROL_REG, CSR_5380_INTR); /* Enable int's */
210
      if (overrides[current_override].irq != IRQ_AUTO)
211
         instance->irq = overrides[current_override].irq;
212
      else
213
         instance->irq = NCR5380_probe_irq(instance, DTC_IRQS);
214
 
215
#ifndef DONT_USE_INTR
216
/* With interrupts enabled, it will sometimes hang when doing heavy
217
 * reads. So better not enable them until I finger it out. */
218
      if (instance->irq != IRQ_NONE)
219
         if (request_irq(instance->irq, dtc_intr, SA_INTERRUPT, "dtc")) {
220
         printk("scsi%d : IRQ%d not free, interrupts disabled\n",
221
              instance->host_no, instance->irq);
222
         instance->irq = IRQ_NONE;
223
      }
224
 
225
      if (instance->irq == IRQ_NONE) {
226
         printk("scsi%d : interrupts not enabled. for better interactive performance,\n", instance->host_no);
227
         printk("scsi%d : please jumper the board for a free IRQ.\n", instance->host_no);
228
      }
229
#else
230
      if (instance->irq != IRQ_NONE)
231
         printk("scsi%d : interrupts not used. Might as well not jumper it.\n",
232
                instance->host_no);
233
      instance->irq = IRQ_NONE;
234
#endif
235
#if defined(DTCDEBUG) && (DTCDEBUG & DTCDEBUG_INIT)
236
      printk("scsi%d : irq = %d\n", instance->host_no, instance->irq);
237
#endif
238
 
239
      printk("scsi%d : at 0x%05X", instance->host_no, (int)instance->base);
240
      if (instance->irq == IRQ_NONE)
241
         printk (" interrupts disabled");
242
      else
243
         printk (" irq %d", instance->irq);
244
      printk(" options CAN_QUEUE=%d  CMD_PER_LUN=%d release=%d",
245
           CAN_QUEUE, CMD_PER_LUN, DTC_PUBLIC_RELEASE);
246
      NCR5380_print_options(instance);
247
      printk("\n");
248
 
249
      ++current_override;
250
      ++count;
251
   }
252
   return count;
253
}
254
 
255
/*
256
 * Function : int dtc_biosparam(Disk * disk, kdev_t dev, int *ip)
257
 *
258
 * Purpose : Generates a BIOS / DOS compatible H-C-S mapping for
259
 *      the specified device / size.
260
 *
261
 * Inputs : size = size of device in sectors (512 bytes), dev = block device
262
 *      major / minor, ip[] = {heads, sectors, cylinders}
263
 *
264
 * Returns : always 0 (success), initializes ip
265
 *
266
*/
267
 
268
/*
269
 * XXX Most SCSI boards use this mapping, I could be incorrect.  Some one
270
 * using hard disks on a trantor should verify that this mapping corresponds
271
 * to that used by the BIOS / ASPI driver by running the linux fdisk program
272
 * and matching the H_C_S coordinates to what DOS uses.
273
*/
274
 
275
int dtc_biosparam(Disk * disk, kdev_t dev, int * ip)
276
{
277
   int size = disk->capacity;
278
 
279
   ip[0] = 64;
280
   ip[1] = 32;
281
   ip[2] = size >> 11;
282
   return 0;
283
}
284
 
285
/****************************************************************
286
 * Function : int NCR5380_pread (struct Scsi_Host *instance,
287
 *      unsigned char *dst, int len)
288
 *
289
 * Purpose : Fast 5380 pseudo-dma read function, reads len bytes to
290
 *      dst
291
 *
292
 * Inputs : dst = destination, len = length in bytes
293
 *
294
 * Returns : 0 on success, non zero on a failure such as a watchdog
295
 *      timeout.
296
*/
297
 
298
static int dtc_maxi = 0;
299
static int dtc_wmaxi = 0;
300
 
301
static inline int NCR5380_pread (struct Scsi_Host *instance,
302
     unsigned char *dst, int len)
303
     {
304
   unsigned char *d = dst;
305
   int i;       /* For counting time spent in the poll-loop */
306
   NCR5380_local_declare();
307
   NCR5380_setup(instance);
308
 
309
   i = 0;
310
   NCR5380_read(RESET_PARITY_INTERRUPT_REG);
311
   NCR5380_write(MODE_REG, MR_ENABLE_EOP_INTR | MR_DMA_MODE);
312
   if (instance->irq == IRQ_NONE)
313
      NCR5380_write(DTC_CONTROL_REG, CSR_DIR_READ);
314
   else
315
      NCR5380_write(DTC_CONTROL_REG, CSR_DIR_READ | CSR_INT_BASE);
316
   NCR5380_write(DTC_BLK_CNT, len >> 7);        /* Block count */
317
   rtrc(1);
318
   while (len > 0) {
319
      rtrc(2);
320
      while (NCR5380_read(DTC_CONTROL_REG) & CSR_HOST_BUF_NOT_RDY)
321
         ++i;
322
      rtrc(3);
323
      memcpy(d, (char *)(base + DTC_DATA_BUF), 128);
324
      d += 128;
325
      len -= 128;
326
      rtrc(7);  /*** with int's on, it sometimes hangs after here.
327
                 * Looks like something makes HBNR go away. */
328
   }
329
   rtrc(4);
330
   while ( !(NCR5380_read(DTC_CONTROL_REG) & D_CR_ACCESS))
331
      ++i;
332
   NCR5380_write(MODE_REG, 0); /* Clear the operating mode */
333
   rtrc(0);
334
   NCR5380_read(RESET_PARITY_INTERRUPT_REG);
335
   if (i > dtc_maxi)
336
      dtc_maxi = i;
337
   return(0);
338
}
339
 
340
/****************************************************************
341
 * Function : int NCR5380_pwrite (struct Scsi_Host *instance,
342
 *      unsigned char *src, int len)
343
 *
344
 * Purpose : Fast 5380 pseudo-dma write function, transfers len bytes from
345
 *      src
346
 *
347
 * Inputs : src = source, len = length in bytes
348
 *
349
 * Returns : 0 on success, non zero on a failure such as a watchdog
350
 *      timeout.
351
*/
352
 
353
static inline int NCR5380_pwrite (struct Scsi_Host *instance,
354
     unsigned char *src, int len) {
355
   int i;
356
   NCR5380_local_declare();
357
   NCR5380_setup(instance);
358
 
359
   NCR5380_read(RESET_PARITY_INTERRUPT_REG);
360
   NCR5380_write(MODE_REG, MR_ENABLE_EOP_INTR | MR_DMA_MODE);
361
   /* set direction (write) */
362
   if (instance->irq == IRQ_NONE)
363
      NCR5380_write(DTC_CONTROL_REG, 0);
364
   else
365
      NCR5380_write(DTC_CONTROL_REG, CSR_5380_INTR);
366
   NCR5380_write(DTC_BLK_CNT, len >> 7);        /* Block count */
367
   for (i = 0; len > 0; ++i) {
368
      rtrc(5);
369
      /* Poll until the host buffer can accept data. */
370
      while (NCR5380_read(DTC_CONTROL_REG) & CSR_HOST_BUF_NOT_RDY)
371
         ++i;
372
      rtrc(3);
373
      memcpy((char *)(base + DTC_DATA_BUF), src, 128);
374
      src += 128;
375
      len -= 128;
376
   }
377
   rtrc(4);
378
   while ( !(NCR5380_read(DTC_CONTROL_REG) & D_CR_ACCESS))
379
      ++i;
380
   rtrc(6);
381
   /* Wait until the last byte has been sent to the disk */
382
   while (!(NCR5380_read(TARGET_COMMAND_REG) & TCR_LAST_BYTE_SENT))
383
      ++i;
384
   rtrc(7);
385
   /* Check for parity error here. fixme. */
386
   NCR5380_write(MODE_REG, 0); /* Clear the operating mode */
387
   rtrc(0);
388
   if (i > dtc_wmaxi)
389
      dtc_wmaxi = i;
390
   return (0);
391
}
392
 
393
#include "NCR5380.c"
394
 
395
#ifdef MODULE
396
/* Eventually this will go into an include file, but this will be later */
397
Scsi_Host_Template driver_template = DTC3x80;
398
 
399
#include "scsi_module.c"
400
#endif

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