1 #define PSEUDO_DMA
2
3 /*
4 * Trantor T128/T128F/T228 driver
5 * Note : architecturally, the T100 and T130 are different and won't
6 * work
7 *
8 * Copyright 1993, Drew Eckhardt
9 * Visionary Computing
10 * (Unix and Linux consulting and custom programming)
11 * drew@colorado.edu
12 * +1 (303) 440-4894
13 *
14 * For more information, please consult
15 *
16 * Trantor Systems, Ltd.
17 * T128/T128F/T228 SCSI Host Adapter
18 * Hardware Specifications
19 *
20 * Trantor Systems, Ltd.
21 * 5415 Randall Place
22 * Fremont, CA 94538
23 * 1+ (415) 770-1400, FAX 1+ (415) 770-9910
24 */
25
26 /*
27 * The card is detected and initialized in one of several ways :
28 * 1. Autoprobe (default) - since the board is memory mapped,
29 * a BIOS signature is scanned for to locate the registers.
30 * An interrupt is triggered to autoprobe for the interrupt
31 * line.
32 *
33 * 2. With command line overrides - t128=address,irq may be
34 * used on the LILO command line to override the defaults.
35 *
36 * 3. With the T128_OVERRIDE compile time define. This is
37 * specified as an array of address, irq tuples. Ie, for
38 * one board at the default 0xcc000 address, IRQ5, I could say
39 * -DT128_OVERRIDE={{0xcc000, 5}}
40 *
41 * Note that if the override methods are used, place holders must
42 * be specified for other boards in the system.
43 *
44 * T128/T128F jumper/dipswitch settings (note : on my sample, the switches
45 * were epoxy'd shut, meaning I couldn't change the 0xcc000 base address) :
46 *
47 * T128 Sw7 Sw8 Sw6 = 0ws Sw5 = boot
48 * T128F Sw6 Sw7 Sw5 = 0ws Sw4 = boot Sw8 = floppy disable
49 * cc000 off off
50 * c8000 off on
51 * dc000 on off
52 * d8000 on on
53 *
54 *
55 * Interrupts
56 * There is a 12 pin jumper block, jp1, numbered as follows :
57 * T128 (JP1) T128F (J5)
58 * 2 4 6 8 10 12 11 9 7 5 3 1
59 * 1 3 5 7 9 11 12 10 8 6 4 2
60 *
61 * 3 2-4
62 * 5 1-3
63 * 7 3-5
64 * T128F only
65 * 10 8-10
66 * 12 7-9
67 * 14 10-12
68 * 15 9-11
69 */
70
71 #include <linux/signal.h>
72 #include <linux/io.h>
73 #include <linux/blkdev.h>
74 #include <linux/interrupt.h>
75 #include <linux/stat.h>
76 #include <linux/init.h>
77 #include <linux/module.h>
78 #include <linux/delay.h>
79
80 #include <scsi/scsi_host.h>
81 #include "t128.h"
82 #define AUTOPROBE_IRQ
83 #include "NCR5380.h"
84
85 static struct override {
86 unsigned long address;
87 int irq;
88 } overrides
89 #ifdef T128_OVERRIDE
90 [] __initdata = T128_OVERRIDE;
91 #else
92 [4] __initdata = {{0, IRQ_AUTO}, {0, IRQ_AUTO},
93 {0 ,IRQ_AUTO}, {0, IRQ_AUTO}};
94 #endif
95
96 #define NO_OVERRIDES ARRAY_SIZE(overrides)
97
98 static struct base {
99 unsigned int address;
100 int noauto;
101 } bases[] __initdata = {
102 { 0xcc000, 0}, { 0xc8000, 0}, { 0xdc000, 0}, { 0xd8000, 0}
103 };
104
105 #define NO_BASES ARRAY_SIZE(bases)
106
107 static struct signature {
108 const char *string;
109 int offset;
110 } signatures[] __initdata = {
111 {"TSROM: SCSI BIOS, Version 1.12", 0x36},
112 };
113
114 #define NO_SIGNATURES ARRAY_SIZE(signatures)
115
116 #ifndef MODULE
117 /*
118 * Function : t128_setup(char *str, int *ints)
119 *
120 * Purpose : LILO command line initialization of the overrides array,
121 *
122 * Inputs : str - unused, ints - array of integer parameters with ints[0]
123 * equal to the number of ints.
124 *
125 */
126
t128_setup(char * str)127 static int __init t128_setup(char *str)
128 {
129 static int commandline_current = 0;
130 int i;
131 int ints[10];
132
133 get_options(str, ARRAY_SIZE(ints), ints);
134 if (ints[0] != 2)
135 printk("t128_setup : usage t128=address,irq\n");
136 else
137 if (commandline_current < NO_OVERRIDES) {
138 overrides[commandline_current].address = ints[1];
139 overrides[commandline_current].irq = ints[2];
140 for (i = 0; i < NO_BASES; ++i)
141 if (bases[i].address == ints[1]) {
142 bases[i].noauto = 1;
143 break;
144 }
145 ++commandline_current;
146 }
147 return 1;
148 }
149
150 __setup("t128=", t128_setup);
151 #endif
152
153 /*
154 * Function : int t128_detect(struct scsi_host_template * tpnt)
155 *
156 * Purpose : detects and initializes T128,T128F, or T228 controllers
157 * that were autoprobed, overridden on the LILO command line,
158 * or specified at compile time.
159 *
160 * Inputs : tpnt - template for this SCSI adapter.
161 *
162 * Returns : 1 if a host adapter was found, 0 if not.
163 *
164 */
165
t128_detect(struct scsi_host_template * tpnt)166 static int __init t128_detect(struct scsi_host_template *tpnt)
167 {
168 static int current_override = 0, current_base = 0;
169 struct Scsi_Host *instance;
170 unsigned long base;
171 void __iomem *p;
172 int sig, count;
173
174 for (count = 0; current_override < NO_OVERRIDES; ++current_override) {
175 base = 0;
176 p = NULL;
177
178 if (overrides[current_override].address) {
179 base = overrides[current_override].address;
180 p = ioremap(bases[current_base].address, 0x2000);
181 if (!p)
182 base = 0;
183 } else
184 for (; !base && (current_base < NO_BASES); ++current_base) {
185 #if (TDEBUG & TDEBUG_INIT)
186 printk("scsi-t128 : probing address %08x\n", bases[current_base].address);
187 #endif
188 if (bases[current_base].noauto)
189 continue;
190 p = ioremap(bases[current_base].address, 0x2000);
191 if (!p)
192 continue;
193 for (sig = 0; sig < NO_SIGNATURES; ++sig)
194 if (check_signature(p + signatures[sig].offset,
195 signatures[sig].string,
196 strlen(signatures[sig].string))) {
197 base = bases[current_base].address;
198 #if (TDEBUG & TDEBUG_INIT)
199 printk("scsi-t128 : detected board.\n");
200 #endif
201 goto found;
202 }
203 iounmap(p);
204 }
205
206 #if defined(TDEBUG) && (TDEBUG & TDEBUG_INIT)
207 printk("scsi-t128 : base = %08x\n", (unsigned int) base);
208 #endif
209
210 if (!base)
211 break;
212
213 found:
214 instance = scsi_register (tpnt, sizeof(struct NCR5380_hostdata));
215 if(instance == NULL)
216 break;
217
218 instance->base = base;
219 ((struct NCR5380_hostdata *)instance->hostdata)->base = p;
220
221 NCR5380_init(instance, 0);
222
223 if (overrides[current_override].irq != IRQ_AUTO)
224 instance->irq = overrides[current_override].irq;
225 else
226 instance->irq = NCR5380_probe_irq(instance, T128_IRQS);
227
228 /* Compatibility with documented NCR5380 kernel parameters */
229 if (instance->irq == 255)
230 instance->irq = NO_IRQ;
231
232 if (instance->irq != NO_IRQ)
233 if (request_irq(instance->irq, t128_intr, 0, "t128",
234 instance)) {
235 printk("scsi%d : IRQ%d not free, interrupts disabled\n",
236 instance->host_no, instance->irq);
237 instance->irq = NO_IRQ;
238 }
239
240 if (instance->irq == NO_IRQ) {
241 printk("scsi%d : interrupts not enabled. for better interactive performance,\n", instance->host_no);
242 printk("scsi%d : please jumper the board for a free IRQ.\n", instance->host_no);
243 }
244
245 #if defined(TDEBUG) && (TDEBUG & TDEBUG_INIT)
246 printk("scsi%d : irq = %d\n", instance->host_no, instance->irq);
247 #endif
248
249 ++current_override;
250 ++count;
251 }
252 return count;
253 }
254
t128_release(struct Scsi_Host * shost)255 static int t128_release(struct Scsi_Host *shost)
256 {
257 NCR5380_local_declare();
258 NCR5380_setup(shost);
259 if (shost->irq != NO_IRQ)
260 free_irq(shost->irq, shost);
261 NCR5380_exit(shost);
262 if (shost->io_port && shost->n_io_port)
263 release_region(shost->io_port, shost->n_io_port);
264 scsi_unregister(shost);
265 iounmap(base);
266 return 0;
267 }
268
269 /*
270 * Function : int t128_biosparam(Disk * disk, struct block_device *dev, int *ip)
271 *
272 * Purpose : Generates a BIOS / DOS compatible H-C-S mapping for
273 * the specified device / size.
274 *
275 * Inputs : size = size of device in sectors (512 bytes), dev = block device
276 * major / minor, ip[] = {heads, sectors, cylinders}
277 *
278 * Returns : always 0 (success), initializes ip
279 *
280 */
281
282 /*
283 * XXX Most SCSI boards use this mapping, I could be incorrect. Some one
284 * using hard disks on a trantor should verify that this mapping corresponds
285 * to that used by the BIOS / ASPI driver by running the linux fdisk program
286 * and matching the H_C_S coordinates to what DOS uses.
287 */
288
t128_biosparam(struct scsi_device * sdev,struct block_device * bdev,sector_t capacity,int * ip)289 static int t128_biosparam(struct scsi_device *sdev, struct block_device *bdev,
290 sector_t capacity, int *ip)
291 {
292 ip[0] = 64;
293 ip[1] = 32;
294 ip[2] = capacity >> 11;
295 return 0;
296 }
297
298 /*
299 * Function : int NCR5380_pread (struct Scsi_Host *instance,
300 * unsigned char *dst, int len)
301 *
302 * Purpose : Fast 5380 pseudo-dma read function, transfers len bytes to
303 * dst
304 *
305 * Inputs : dst = destination, len = length in bytes
306 *
307 * Returns : 0 on success, non zero on a failure such as a watchdog
308 * timeout.
309 */
310
NCR5380_pread(struct Scsi_Host * instance,unsigned char * dst,int len)311 static inline int NCR5380_pread (struct Scsi_Host *instance, unsigned char *dst,
312 int len) {
313 NCR5380_local_declare();
314 void __iomem *reg;
315 unsigned char *d = dst;
316 register int i = len;
317
318 NCR5380_setup(instance);
319 reg = base + T_DATA_REG_OFFSET;
320
321 #if 0
322 for (; i; --i) {
323 while (!(readb(base+T_STATUS_REG_OFFSET) & T_ST_RDY)) barrier();
324 #else
325 while (!(readb(base+T_STATUS_REG_OFFSET) & T_ST_RDY)) barrier();
326 for (; i; --i) {
327 #endif
328 *d++ = readb(reg);
329 }
330
331 if (readb(base + T_STATUS_REG_OFFSET) & T_ST_TIM) {
332 unsigned char tmp;
333 void __iomem *foo = base + T_CONTROL_REG_OFFSET;
334 tmp = readb(foo);
335 writeb(tmp | T_CR_CT, foo);
336 writeb(tmp, foo);
337 printk("scsi%d : watchdog timer fired in NCR5380_pread()\n",
338 instance->host_no);
339 return -1;
340 } else
341 return 0;
342 }
343
344 /*
345 * Function : int NCR5380_pwrite (struct Scsi_Host *instance,
346 * unsigned char *src, int len)
347 *
348 * Purpose : Fast 5380 pseudo-dma write function, transfers len bytes from
349 * src
350 *
351 * Inputs : src = source, len = length in bytes
352 *
353 * Returns : 0 on success, non zero on a failure such as a watchdog
354 * timeout.
355 */
356
357 static inline int NCR5380_pwrite (struct Scsi_Host *instance, unsigned char *src,
358 int len) {
359 NCR5380_local_declare();
360 void __iomem *reg;
361 unsigned char *s = src;
362 register int i = len;
363
364 NCR5380_setup(instance);
365 reg = base + T_DATA_REG_OFFSET;
366
367 #if 0
368 for (; i; --i) {
369 while (!(readb(base+T_STATUS_REG_OFFSET) & T_ST_RDY)) barrier();
370 #else
371 while (!(readb(base+T_STATUS_REG_OFFSET) & T_ST_RDY)) barrier();
372 for (; i; --i) {
373 #endif
374 writeb(*s++, reg);
375 }
376
377 if (readb(base + T_STATUS_REG_OFFSET) & T_ST_TIM) {
378 unsigned char tmp;
379 void __iomem *foo = base + T_CONTROL_REG_OFFSET;
380 tmp = readb(foo);
381 writeb(tmp | T_CR_CT, foo);
382 writeb(tmp, foo);
383 printk("scsi%d : watchdog timer fired in NCR5380_pwrite()\n",
384 instance->host_no);
385 return -1;
386 } else
387 return 0;
388 }
389
390 MODULE_LICENSE("GPL");
391
392 #include "NCR5380.c"
393
394 static struct scsi_host_template driver_template = {
395 .name = "Trantor T128/T128F/T228",
396 .detect = t128_detect,
397 .release = t128_release,
398 .proc_name = "t128",
399 .show_info = t128_show_info,
400 .write_info = t128_write_info,
401 .info = t128_info,
402 .queuecommand = t128_queue_command,
403 .eh_abort_handler = t128_abort,
404 .eh_bus_reset_handler = t128_bus_reset,
405 .bios_param = t128_biosparam,
406 .can_queue = CAN_QUEUE,
407 .this_id = 7,
408 .sg_tablesize = SG_ALL,
409 .cmd_per_lun = CMD_PER_LUN,
410 .use_clustering = DISABLE_CLUSTERING,
411 };
412 #include "scsi_module.c"
413