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1 #define AUTOSENSE
2 #define PSEUDO_DMA
3 
4 /*
5  * Trantor T128/T128F/T228 driver
6  *	Note : architecturally, the T100 and T130 are different and won't
7  * 	work
8  *
9  * Copyright 1993, Drew Eckhardt
10  *	Visionary Computing
11  *	(Unix and Linux consulting and custom programming)
12  *	drew@colorado.edu
13  *      +1 (303) 440-4894
14  *
15  * DISTRIBUTION RELEASE 3.
16  *
17  * For more information, please consult
18  *
19  * Trantor Systems, Ltd.
20  * T128/T128F/T228 SCSI Host Adapter
21  * Hardware Specifications
22  *
23  * Trantor Systems, Ltd.
24  * 5415 Randall Place
25  * Fremont, CA 94538
26  * 1+ (415) 770-1400, FAX 1+ (415) 770-9910
27  *
28  * and
29  *
30  * NCR 5380 Family
31  * SCSI Protocol Controller
32  * Databook
33  *
34  * NCR Microelectronics
35  * 1635 Aeroplaza Drive
36  * Colorado Springs, CO 80916
37  * 1+ (719) 578-3400
38  * 1+ (800) 334-5454
39  */
40 
41 /*
42  * Options :
43  * AUTOSENSE - if defined, REQUEST SENSE will be performed automatically
44  *      for commands that return with a CHECK CONDITION status.
45  *
46  * PSEUDO_DMA - enables PSEUDO-DMA hardware, should give a 3-4X performance
47  * increase compared to polled I/O.
48  *
49  * PARITY - enable parity checking.  Not supported.
50  *
51  * SCSI2 - enable support for SCSI-II tagged queueing.  Untested.
52  *
53  *
54  * UNSAFE - leave interrupts enabled during pseudo-DMA transfers.  You
55  *          only really want to use this if you're having a problem with
56  *          dropped characters during high speed communications, and even
57  *          then, you're going to be better off twiddling with transfersize.
58  *
59  * USLEEP - enable support for devices that don't disconnect.  Untested.
60  *
61  * The card is detected and initialized in one of several ways :
62  * 1.  Autoprobe (default) - since the board is memory mapped,
63  *     a BIOS signature is scanned for to locate the registers.
64  *     An interrupt is triggered to autoprobe for the interrupt
65  *     line.
66  *
67  * 2.  With command line overrides - t128=address,irq may be
68  *     used on the LILO command line to override the defaults.
69  *
70  * 3.  With the T128_OVERRIDE compile time define.  This is
71  *     specified as an array of address, irq tuples.  Ie, for
72  *     one board at the default 0xcc000 address, IRQ5, I could say
73  *     -DT128_OVERRIDE={{0xcc000, 5}}
74  *
75  *     Note that if the override methods are used, place holders must
76  *     be specified for other boards in the system.
77  *
78  * T128/T128F jumper/dipswitch settings (note : on my sample, the switches
79  * were epoxy'd shut, meaning I couldn't change the 0xcc000 base address) :
80  *
81  * T128    Sw7 Sw8 Sw6 = 0ws Sw5 = boot
82  * T128F   Sw6 Sw7 Sw5 = 0ws Sw4 = boot Sw8 = floppy disable
83  * cc000   off off
84  * c8000   off on
85  * dc000   on  off
86  * d8000   on  on
87  *
88  *
89  * Interrupts
90  * There is a 12 pin jumper block, jp1, numbered as follows :
91  *   T128 (JP1)  	 T128F (J5)
92  * 2 4 6 8 10 12	11 9  7 5 3 1
93  * 1 3 5 7 9  11	12 10 8 6 4 2
94  *
95  * 3   2-4
96  * 5   1-3
97  * 7   3-5
98  * T128F only
99  * 10 8-10
100  * 12 7-9
101  * 14 10-12
102  * 15 9-11
103  */
104 
105 /*
106  * $Log: t128.c,v $
107  */
108 
109 #include <linux/signal.h>
110 #include <linux/io.h>
111 #include <linux/blkdev.h>
112 #include <linux/interrupt.h>
113 #include <linux/stat.h>
114 #include <linux/init.h>
115 #include <linux/module.h>
116 #include <linux/delay.h>
117 
118 #include "scsi.h"
119 #include <scsi/scsi_host.h>
120 #include "t128.h"
121 #define AUTOPROBE_IRQ
122 #include "NCR5380.h"
123 
124 static struct override {
125     unsigned long address;
126     int irq;
127 } overrides
128 #ifdef T128_OVERRIDE
129     [] __initdata = T128_OVERRIDE;
130 #else
131     [4] __initdata = {{0, IRQ_AUTO}, {0, IRQ_AUTO},
132         {0 ,IRQ_AUTO}, {0, IRQ_AUTO}};
133 #endif
134 
135 #define NO_OVERRIDES ARRAY_SIZE(overrides)
136 
137 static struct base {
138     unsigned int address;
139     int noauto;
140 } bases[] __initdata = {
141     { 0xcc000, 0}, { 0xc8000, 0}, { 0xdc000, 0}, { 0xd8000, 0}
142 };
143 
144 #define NO_BASES ARRAY_SIZE(bases)
145 
146 static struct signature {
147     const char *string;
148     int offset;
149 } signatures[] __initdata = {
150 {"TSROM: SCSI BIOS, Version 1.12", 0x36},
151 };
152 
153 #define NO_SIGNATURES ARRAY_SIZE(signatures)
154 
155 /*
156  * Function : t128_setup(char *str, int *ints)
157  *
158  * Purpose : LILO command line initialization of the overrides array,
159  *
160  * Inputs : str - unused, ints - array of integer parameters with ints[0]
161  *	equal to the number of ints.
162  *
163  */
164 
t128_setup(char * str,int * ints)165 void __init t128_setup(char *str, int *ints){
166     static int commandline_current = 0;
167     int i;
168     if (ints[0] != 2)
169 	printk("t128_setup : usage t128=address,irq\n");
170     else
171 	if (commandline_current < NO_OVERRIDES) {
172 	    overrides[commandline_current].address = ints[1];
173 	    overrides[commandline_current].irq = ints[2];
174 	    for (i = 0; i < NO_BASES; ++i)
175 		if (bases[i].address == ints[1]) {
176 		    bases[i].noauto = 1;
177 		    break;
178 		}
179 	    ++commandline_current;
180 	}
181 }
182 
183 /*
184  * Function : int t128_detect(struct scsi_host_template * tpnt)
185  *
186  * Purpose : detects and initializes T128,T128F, or T228 controllers
187  *	that were autoprobed, overridden on the LILO command line,
188  *	or specified at compile time.
189  *
190  * Inputs : tpnt - template for this SCSI adapter.
191  *
192  * Returns : 1 if a host adapter was found, 0 if not.
193  *
194  */
195 
t128_detect(struct scsi_host_template * tpnt)196 int __init t128_detect(struct scsi_host_template * tpnt){
197     static int current_override = 0, current_base = 0;
198     struct Scsi_Host *instance;
199     unsigned long base;
200     void __iomem *p;
201     int sig, count;
202 
203     tpnt->proc_name = "t128";
204     tpnt->show_info = t128_show_info;
205     tpnt->write_info = t128_write_info;
206 
207     for (count = 0; current_override < NO_OVERRIDES; ++current_override) {
208 	base = 0;
209 	p = NULL;
210 
211 	if (overrides[current_override].address) {
212 	    base = overrides[current_override].address;
213 	    p = ioremap(bases[current_base].address, 0x2000);
214 	    if (!p)
215 		base = 0;
216 	} else
217 	    for (; !base && (current_base < NO_BASES); ++current_base) {
218 #if (TDEBUG & TDEBUG_INIT)
219     printk("scsi-t128 : probing address %08x\n", bases[current_base].address);
220 #endif
221 		if (bases[current_base].noauto)
222 			continue;
223 		p = ioremap(bases[current_base].address, 0x2000);
224 		if (!p)
225 			continue;
226 		for (sig = 0; sig < NO_SIGNATURES; ++sig)
227 		    if (check_signature(p + signatures[sig].offset,
228 					signatures[sig].string,
229 					strlen(signatures[sig].string))) {
230 			base = bases[current_base].address;
231 #if (TDEBUG & TDEBUG_INIT)
232 			printk("scsi-t128 : detected board.\n");
233 #endif
234 			goto found;
235 		    }
236 		iounmap(p);
237 	    }
238 
239 #if defined(TDEBUG) && (TDEBUG & TDEBUG_INIT)
240 	printk("scsi-t128 : base = %08x\n", (unsigned int) base);
241 #endif
242 
243 	if (!base)
244 	    break;
245 
246 found:
247 	instance = scsi_register (tpnt, sizeof(struct NCR5380_hostdata));
248 	if(instance == NULL)
249 		break;
250 
251 	instance->base = base;
252 	((struct NCR5380_hostdata *)instance->hostdata)->base = p;
253 
254 	NCR5380_init(instance, 0);
255 
256 	if (overrides[current_override].irq != IRQ_AUTO)
257 	    instance->irq = overrides[current_override].irq;
258 	else
259 	    instance->irq = NCR5380_probe_irq(instance, T128_IRQS);
260 
261 	if (instance->irq != SCSI_IRQ_NONE)
262 	    if (request_irq(instance->irq, t128_intr, IRQF_DISABLED, "t128",
263 			    instance)) {
264 		printk("scsi%d : IRQ%d not free, interrupts disabled\n",
265 		    instance->host_no, instance->irq);
266 		instance->irq = SCSI_IRQ_NONE;
267 	    }
268 
269 	if (instance->irq == SCSI_IRQ_NONE) {
270 	    printk("scsi%d : interrupts not enabled. for better interactive performance,\n", instance->host_no);
271 	    printk("scsi%d : please jumper the board for a free IRQ.\n", instance->host_no);
272 	}
273 
274 #if defined(TDEBUG) && (TDEBUG & TDEBUG_INIT)
275 	printk("scsi%d : irq = %d\n", instance->host_no, instance->irq);
276 #endif
277 
278 	printk("scsi%d : at 0x%08lx", instance->host_no, instance->base);
279 	if (instance->irq == SCSI_IRQ_NONE)
280 	    printk (" interrupts disabled");
281 	else
282 	    printk (" irq %d", instance->irq);
283 	printk(" options CAN_QUEUE=%d  CMD_PER_LUN=%d release=%d",
284 	    CAN_QUEUE, CMD_PER_LUN, T128_PUBLIC_RELEASE);
285 	NCR5380_print_options(instance);
286 	printk("\n");
287 
288 	++current_override;
289 	++count;
290     }
291     return count;
292 }
293 
t128_release(struct Scsi_Host * shost)294 static int t128_release(struct Scsi_Host *shost)
295 {
296 	NCR5380_local_declare();
297 	NCR5380_setup(shost);
298 	if (shost->irq)
299 		free_irq(shost->irq, shost);
300 	NCR5380_exit(shost);
301 	if (shost->io_port && shost->n_io_port)
302 		release_region(shost->io_port, shost->n_io_port);
303 	scsi_unregister(shost);
304 	iounmap(base);
305 	return 0;
306 }
307 
308 /*
309  * Function : int t128_biosparam(Disk * disk, struct block_device *dev, int *ip)
310  *
311  * Purpose : Generates a BIOS / DOS compatible H-C-S mapping for
312  *	the specified device / size.
313  *
314  * Inputs : size = size of device in sectors (512 bytes), dev = block device
315  *	major / minor, ip[] = {heads, sectors, cylinders}
316  *
317  * Returns : always 0 (success), initializes ip
318  *
319  */
320 
321 /*
322  * XXX Most SCSI boards use this mapping, I could be incorrect.  Some one
323  * using hard disks on a trantor should verify that this mapping corresponds
324  * to that used by the BIOS / ASPI driver by running the linux fdisk program
325  * and matching the H_C_S coordinates to what DOS uses.
326  */
327 
t128_biosparam(struct scsi_device * sdev,struct block_device * bdev,sector_t capacity,int * ip)328 int t128_biosparam(struct scsi_device *sdev, struct block_device *bdev,
329 		sector_t capacity, int * ip)
330 {
331   ip[0] = 64;
332   ip[1] = 32;
333   ip[2] = capacity >> 11;
334   return 0;
335 }
336 
337 /*
338  * Function : int NCR5380_pread (struct Scsi_Host *instance,
339  *	unsigned char *dst, int len)
340  *
341  * Purpose : Fast 5380 pseudo-dma read function, transfers len bytes to
342  *	dst
343  *
344  * Inputs : dst = destination, len = length in bytes
345  *
346  * Returns : 0 on success, non zero on a failure such as a watchdog
347  * 	timeout.
348  */
349 
NCR5380_pread(struct Scsi_Host * instance,unsigned char * dst,int len)350 static inline int NCR5380_pread (struct Scsi_Host *instance, unsigned char *dst,
351     int len) {
352     NCR5380_local_declare();
353     void __iomem *reg;
354     unsigned char *d = dst;
355     register int i = len;
356 
357     NCR5380_setup(instance);
358     reg = base + T_DATA_REG_OFFSET;
359 
360 #if 0
361     for (; i; --i) {
362 	while (!(readb(base+T_STATUS_REG_OFFSET) & T_ST_RDY)) barrier();
363 #else
364     while (!(readb(base+T_STATUS_REG_OFFSET) & T_ST_RDY)) barrier();
365     for (; i; --i) {
366 #endif
367 	*d++ = readb(reg);
368     }
369 
370     if (readb(base + T_STATUS_REG_OFFSET) & T_ST_TIM) {
371 	unsigned char tmp;
372 	void __iomem *foo = base + T_CONTROL_REG_OFFSET;
373 	tmp = readb(foo);
374 	writeb(tmp | T_CR_CT, foo);
375 	writeb(tmp, foo);
376 	printk("scsi%d : watchdog timer fired in NCR5380_pread()\n",
377 	    instance->host_no);
378 	return -1;
379     } else
380 	return 0;
381 }
382 
383 /*
384  * Function : int NCR5380_pwrite (struct Scsi_Host *instance,
385  *	unsigned char *src, int len)
386  *
387  * Purpose : Fast 5380 pseudo-dma write function, transfers len bytes from
388  *	src
389  *
390  * Inputs : src = source, len = length in bytes
391  *
392  * Returns : 0 on success, non zero on a failure such as a watchdog
393  * 	timeout.
394  */
395 
396 static inline int NCR5380_pwrite (struct Scsi_Host *instance, unsigned char *src,
397     int len) {
398     NCR5380_local_declare();
399     void __iomem *reg;
400     unsigned char *s = src;
401     register int i = len;
402 
403     NCR5380_setup(instance);
404     reg = base + T_DATA_REG_OFFSET;
405 
406 #if 0
407     for (; i; --i) {
408 	while (!(readb(base+T_STATUS_REG_OFFSET) & T_ST_RDY)) barrier();
409 #else
410     while (!(readb(base+T_STATUS_REG_OFFSET) & T_ST_RDY)) barrier();
411     for (; i; --i) {
412 #endif
413 	writeb(*s++, reg);
414     }
415 
416     if (readb(base + T_STATUS_REG_OFFSET) & T_ST_TIM) {
417 	unsigned char tmp;
418 	void __iomem *foo = base + T_CONTROL_REG_OFFSET;
419 	tmp = readb(foo);
420 	writeb(tmp | T_CR_CT, foo);
421 	writeb(tmp, foo);
422 	printk("scsi%d : watchdog timer fired in NCR5380_pwrite()\n",
423 	    instance->host_no);
424 	return -1;
425     } else
426 	return 0;
427 }
428 
429 MODULE_LICENSE("GPL");
430 
431 #include "NCR5380.c"
432 
433 static struct scsi_host_template driver_template = {
434 	.name           = "Trantor T128/T128F/T228",
435 	.detect         = t128_detect,
436 	.release        = t128_release,
437 	.queuecommand   = t128_queue_command,
438 	.eh_abort_handler = t128_abort,
439 	.eh_bus_reset_handler    = t128_bus_reset,
440 	.bios_param     = t128_biosparam,
441 	.can_queue      = CAN_QUEUE,
442         .this_id        = 7,
443 	.sg_tablesize   = SG_ALL,
444 	.cmd_per_lun    = CMD_PER_LUN,
445 	.use_clustering = DISABLE_CLUSTERING,
446 };
447 #include "scsi_module.c"
448