1 /*
2 * linux/drivers/acorn/scsi/powertec.c
3 *
4 * Copyright (C) 1997-2003 Russell King
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License version 2 as
8 * published by the Free Software Foundation.
9 *
10 * This driver is based on experimentation. Hence, it may have made
11 * assumptions about the particular card that I have available, and
12 * may not be reliable!
13 *
14 * Changelog:
15 * 01-10-1997 RMK Created, READONLY version.
16 * 15-02-1998 RMK Added DMA support and hardware definitions.
17 * 15-04-1998 RMK Only do PIO if FAS216 will allow it.
18 * 02-05-1998 RMK Moved DMA sg list into per-interface structure.
19 * 27-06-1998 RMK Changed asm/delay.h to linux/delay.h
20 * 02-04-2000 RMK Updated for new error handling code.
21 */
22 #include <linux/module.h>
23 #include <linux/blk.h>
24 #include <linux/kernel.h>
25 #include <linux/string.h>
26 #include <linux/ioport.h>
27 #include <linux/sched.h>
28 #include <linux/proc_fs.h>
29 #include <linux/delay.h>
30 #include <linux/pci.h>
31 #include <linux/init.h>
32
33 #include <asm/dma.h>
34 #include <asm/ecard.h>
35 #include <asm/io.h>
36 #include <asm/irq.h>
37 #include <asm/pgtable.h>
38
39 #include "../../scsi/sd.h"
40 #include "../../scsi/hosts.h"
41 #include "fas216.h"
42 #include "scsi.h"
43
44 #include <scsi/scsicam.h>
45
46 /*
47 * List of devices that the driver will recognise
48 */
49 #define POWERTECSCSI_LIST { MANU_ALSYSTEMS, PROD_ALSYS_SCSIATAPI }
50
51 #define POWERTEC_FAS216_OFFSET 0xc00
52 #define POWERTEC_FAS216_SHIFT 4
53
54 #define POWERTEC_INTR_STATUS 0x800
55 #define POWERTEC_INTR_BIT 0x80
56
57 #define POWERTEC_RESET_CONTROL 0x406
58 #define POWERTEC_RESET_BIT 1
59
60 #define POWERTEC_TERM_CONTROL 0x806
61 #define POWERTEC_TERM_ENABLE 1
62
63 #define POWERTEC_INTR_CONTROL 0x407
64 #define POWERTEC_INTR_ENABLE 1
65 #define POWERTEC_INTR_DISABLE 0
66
67 #define VERSION "1.10 (22/01/2003 2.4.19-rmk5)"
68
69 /*
70 * Use term=0,1,0,0,0 to turn terminators on/off.
71 * One entry per slot.
72 */
73 static int term[MAX_ECARDS] = { 1, 1, 1, 1, 1, 1, 1, 1 };
74
75 #define NR_SG 256
76
77 struct powertec_info {
78 FAS216_Info info;
79 struct expansion_card *ec;
80 unsigned int term_port;
81 unsigned int term_ctl;
82 struct scatterlist sg[NR_SG];
83 };
84
85 /* Prototype: void powertecscsi_irqenable(ec, irqnr)
86 * Purpose : Enable interrupts on Powertec SCSI card
87 * Params : ec - expansion card structure
88 * : irqnr - interrupt number
89 */
90 static void
powertecscsi_irqenable(struct expansion_card * ec,int irqnr)91 powertecscsi_irqenable(struct expansion_card *ec, int irqnr)
92 {
93 unsigned int port = (unsigned int)ec->irq_data;
94 outb(POWERTEC_INTR_ENABLE, port);
95 }
96
97 /* Prototype: void powertecscsi_irqdisable(ec, irqnr)
98 * Purpose : Disable interrupts on Powertec SCSI card
99 * Params : ec - expansion card structure
100 * : irqnr - interrupt number
101 */
102 static void
powertecscsi_irqdisable(struct expansion_card * ec,int irqnr)103 powertecscsi_irqdisable(struct expansion_card *ec, int irqnr)
104 {
105 unsigned int port = (unsigned int)ec->irq_data;
106 outb(POWERTEC_INTR_DISABLE, port);
107 }
108
109 static const expansioncard_ops_t powertecscsi_ops = {
110 .irqenable = powertecscsi_irqenable,
111 .irqdisable = powertecscsi_irqdisable,
112 };
113
114 /* Prototype: void powertecscsi_terminator_ctl(host, on_off)
115 * Purpose : Turn the Powertec SCSI terminators on or off
116 * Params : host - card to turn on/off
117 * : on_off - !0 to turn on, 0 to turn off
118 */
119 static void
powertecscsi_terminator_ctl(struct Scsi_Host * host,int on_off)120 powertecscsi_terminator_ctl(struct Scsi_Host *host, int on_off)
121 {
122 struct powertec_info *info = (struct powertec_info *)host->hostdata;
123
124 info->term_ctl = on_off ? POWERTEC_TERM_ENABLE : 0;
125 outb(info->term_ctl, info->term_port);
126 }
127
128 /* Prototype: void powertecscsi_intr(irq, *dev_id, *regs)
129 * Purpose : handle interrupts from Powertec SCSI card
130 * Params : irq - interrupt number
131 * dev_id - user-defined (Scsi_Host structure)
132 * regs - processor registers at interrupt
133 */
134 static void
powertecscsi_intr(int irq,void * dev_id,struct pt_regs * regs)135 powertecscsi_intr(int irq, void *dev_id, struct pt_regs *regs)
136 {
137 fas216_intr(dev_id);
138 }
139
140 /* Prototype: fasdmatype_t powertecscsi_dma_setup(host, SCpnt, direction, min_type)
141 * Purpose : initialises DMA/PIO
142 * Params : host - host
143 * SCpnt - command
144 * direction - DMA on to/off of card
145 * min_type - minimum DMA support that we must have for this transfer
146 * Returns : type of transfer to be performed
147 */
148 static fasdmatype_t
powertecscsi_dma_setup(struct Scsi_Host * host,Scsi_Pointer * SCp,fasdmadir_t direction,fasdmatype_t min_type)149 powertecscsi_dma_setup(struct Scsi_Host *host, Scsi_Pointer *SCp,
150 fasdmadir_t direction, fasdmatype_t min_type)
151 {
152 struct powertec_info *info = (struct powertec_info *)host->hostdata;
153 int dmach = host->dma_channel;
154
155 if (info->info.ifcfg.capabilities & FASCAP_DMA &&
156 min_type == fasdma_real_all) {
157 int bufs, map_dir, dma_dir;
158
159 bufs = copy_SCp_to_sg(&info->sg[0], SCp, NR_SG);
160
161 if (direction == DMA_OUT)
162 map_dir = PCI_DMA_TODEVICE,
163 dma_dir = DMA_MODE_WRITE;
164 else
165 map_dir = PCI_DMA_FROMDEVICE,
166 dma_dir = DMA_MODE_READ;
167
168 pci_map_sg(NULL, info->sg, bufs, map_dir);
169
170 disable_dma(dmach);
171 set_dma_sg(dmach, info->sg, bufs);
172 set_dma_mode(dmach, dma_dir);
173 enable_dma(dmach);
174 return fasdma_real_all;
175 }
176
177 /*
178 * If we're not doing DMA,
179 * we'll do slow PIO
180 */
181 return fasdma_pio;
182 }
183
184 /* Prototype: int powertecscsi_dma_stop(host, SCpnt)
185 * Purpose : stops DMA/PIO
186 * Params : host - host
187 * SCpnt - command
188 */
189 static void
powertecscsi_dma_stop(struct Scsi_Host * host,Scsi_Pointer * SCp)190 powertecscsi_dma_stop(struct Scsi_Host *host, Scsi_Pointer *SCp)
191 {
192 if (host->dma_channel != NO_DMA)
193 disable_dma(host->dma_channel);
194 }
195
196 /* Prototype: const char *powertecscsi_info(struct Scsi_Host * host)
197 * Purpose : returns a descriptive string about this interface,
198 * Params : host - driver host structure to return info for.
199 * Returns : pointer to a static buffer containing null terminated string.
200 */
powertecscsi_info(struct Scsi_Host * host)201 const char *powertecscsi_info(struct Scsi_Host *host)
202 {
203 struct powertec_info *info = (struct powertec_info *)host->hostdata;
204 static char string[150];
205
206 sprintf(string, "%s (%s) in slot %d v%s terminators o%s",
207 host->hostt->name, info->info.scsi.type, info->ec->slot_no,
208 VERSION, info->term_ctl ? "n" : "ff");
209
210 return string;
211 }
212
213 /* Prototype: int powertecscsi_set_proc_info(struct Scsi_Host *host, char *buffer, int length)
214 * Purpose : Set a driver specific function
215 * Params : host - host to setup
216 * : buffer - buffer containing string describing operation
217 * : length - length of string
218 * Returns : -EINVAL, or 0
219 */
220 static int
powertecscsi_set_proc_info(struct Scsi_Host * host,char * buffer,int length)221 powertecscsi_set_proc_info(struct Scsi_Host *host, char *buffer, int length)
222 {
223 int ret = length;
224
225 if (length >= 12 && strncmp(buffer, "POWERTECSCSI", 12) == 0) {
226 buffer += 12;
227 length -= 12;
228
229 if (length >= 5 && strncmp(buffer, "term=", 5) == 0) {
230 if (buffer[5] == '1')
231 powertecscsi_terminator_ctl(host, 1);
232 else if (buffer[5] == '0')
233 powertecscsi_terminator_ctl(host, 0);
234 else
235 ret = -EINVAL;
236 } else
237 ret = -EINVAL;
238 } else
239 ret = -EINVAL;
240
241 return ret;
242 }
243
244 /* Prototype: int powertecscsi_proc_info(char *buffer, char **start, off_t offset,
245 * int length, int host_no, int inout)
246 * Purpose : Return information about the driver to a user process accessing
247 * the /proc filesystem.
248 * Params : buffer - a buffer to write information to
249 * start - a pointer into this buffer set by this routine to the start
250 * of the required information.
251 * offset - offset into information that we have read upto.
252 * length - length of buffer
253 * host_no - host number to return information for
254 * inout - 0 for reading, 1 for writing.
255 * Returns : length of data written to buffer.
256 */
powertecscsi_proc_info(char * buffer,char ** start,off_t offset,int length,int host_no,int inout)257 int powertecscsi_proc_info(char *buffer, char **start, off_t offset,
258 int length, int host_no, int inout)
259 {
260 int pos, begin;
261 struct Scsi_Host *host;
262 struct powertec_info *info;
263 Scsi_Device *scd;
264
265 host = scsi_host_hn_get(host_no);
266 if (!host)
267 return 0;
268
269 if (inout == 1)
270 return powertecscsi_set_proc_info(host, buffer, length);
271
272 info = (struct powertec_info *)host->hostdata;
273
274 begin = 0;
275 pos = sprintf(buffer, "PowerTec SCSI driver v%s\n", VERSION);
276
277 pos += fas216_print_host(&info->info, buffer + pos);
278 pos += sprintf(buffer + pos, "Term : o%s\n",
279 info->term_ctl ? "n" : "ff");
280
281 pos += fas216_print_stats(&info->info, buffer + pos);
282
283 pos += sprintf(buffer+pos, "\nAttached devices:\n");
284
285 for (scd = host->host_queue; scd; scd = scd->next) {
286 pos += fas216_print_device(&info->info, scd, buffer + pos);
287
288 if (pos + begin < offset) {
289 begin += pos;
290 pos = 0;
291 }
292 if (pos + begin > offset + length)
293 break;
294 }
295
296 *start = buffer + (offset - begin);
297 pos -= offset - begin;
298 if (pos > length)
299 pos = length;
300
301 return pos;
302 }
303
304 static int powertecscsi_probe(struct expansion_card *ec);
305
306 /* Prototype: int powertecscsi_detect(Scsi_Host_Template * tpnt)
307 * Purpose : initialises PowerTec SCSI driver
308 * Params : tpnt - template for this SCSI adapter
309 * Returns : >0 if host found, 0 otherwise.
310 */
powertecscsi_detect(Scsi_Host_Template * tpnt)311 static int powertecscsi_detect(Scsi_Host_Template *tpnt)
312 {
313 static const card_ids powertecscsi_cids[] =
314 { POWERTECSCSI_LIST, { 0xffff, 0xffff} };
315 struct expansion_card *ec;
316 int count = 0, ret;
317
318 ecard_startfind();
319
320 while (1) {
321 ec = ecard_find(0, powertecscsi_cids);
322 if (!ec)
323 break;
324
325 ecard_claim(ec);
326
327 ret = powertecscsi_probe(ec);
328 if (ret) {
329 ecard_release(ec);
330 break;
331 }
332 ++count;
333 }
334 return count;
335 }
336
337 static void powertecscsi_remove(struct Scsi_Host *host);
338
339 /* Prototype: int powertecscsi_release(struct Scsi_Host * host)
340 * Purpose : releases all resources used by this adapter
341 * Params : host - driver host structure to return info for.
342 */
powertecscsi_release(struct Scsi_Host * host)343 static int powertecscsi_release(struct Scsi_Host *host)
344 {
345 powertecscsi_remove(host);
346 return 0;
347 }
348
349 static Scsi_Host_Template powertecscsi_template = {
350 .module = THIS_MODULE,
351 .proc_info = powertecscsi_proc_info,
352 .name = "PowerTec SCSI",
353 .detect = powertecscsi_detect,
354 .release = powertecscsi_release,
355 .info = powertecscsi_info,
356 .bios_param = scsicam_bios_param,
357 .command = fas216_command,
358 .queuecommand = fas216_queue_command,
359 .eh_host_reset_handler = fas216_eh_host_reset,
360 .eh_bus_reset_handler = fas216_eh_bus_reset,
361 .eh_device_reset_handler = fas216_eh_device_reset,
362 .eh_abort_handler = fas216_eh_abort,
363 .use_new_eh_code = 1,
364
365 .can_queue = 1,
366 .this_id = 7,
367 .sg_tablesize = SG_ALL,
368 .cmd_per_lun = 1,
369 .use_clustering = ENABLE_CLUSTERING,
370 .proc_name = "powertec",
371 };
372
373 static int
powertecscsi_probe(struct expansion_card * ec)374 powertecscsi_probe(struct expansion_card *ec)
375 {
376 struct Scsi_Host *host;
377 struct powertec_info *info;
378 unsigned long base;
379 int ret;
380
381 base = ecard_address(ec, ECARD_IOC, ECARD_FAST);
382
383 request_region(base + POWERTEC_FAS216_OFFSET,
384 16 << POWERTEC_FAS216_SHIFT, "powertec2-fas");
385
386 host = scsi_register(&powertecscsi_template,
387 sizeof (struct powertec_info));
388 if (!host) {
389 ret = -ENOMEM;
390 goto out_region;
391 }
392
393 host->io_port = base;
394 host->irq = ec->irq;
395 host->dma_channel = ec->dma;
396
397 ec->irqaddr = (unsigned char *)ioaddr(base + POWERTEC_INTR_STATUS);
398 ec->irqmask = POWERTEC_INTR_BIT;
399 ec->irq_data = (void *)(base + POWERTEC_INTR_CONTROL);
400 ec->ops = (expansioncard_ops_t *)&powertecscsi_ops;
401
402 info = (struct powertec_info *)host->hostdata;
403 info->ec = ec;
404 info->term_port = base + POWERTEC_TERM_CONTROL;
405 powertecscsi_terminator_ctl(host, term[ec->slot_no]);
406
407 info->info.scsi.io_port = host->io_port + POWERTEC_FAS216_OFFSET;
408 info->info.scsi.io_shift = POWERTEC_FAS216_SHIFT;
409 info->info.scsi.irq = host->irq;
410 info->info.ifcfg.clockrate = 40; /* MHz */
411 info->info.ifcfg.select_timeout = 255;
412 info->info.ifcfg.asyncperiod = 200; /* ns */
413 info->info.ifcfg.sync_max_depth = 7;
414 info->info.ifcfg.cntl3 = CNTL3_BS8 | CNTL3_FASTSCSI | CNTL3_FASTCLK;
415 info->info.ifcfg.disconnect_ok = 1;
416 info->info.ifcfg.wide_max_size = 0;
417 info->info.ifcfg.capabilities = 0;
418 info->info.dma.setup = powertecscsi_dma_setup;
419 info->info.dma.pseudo = NULL;
420 info->info.dma.stop = powertecscsi_dma_stop;
421
422 ret = fas216_init(host);
423 if (ret)
424 goto out_free;
425
426 ret = request_irq(host->irq, powertecscsi_intr,
427 SA_INTERRUPT, "powertec", &info->info);
428 if (ret) {
429 printk("scsi%d: IRQ%d not free: %d\n",
430 host->host_no, host->irq, ret);
431 goto out_release;
432 }
433
434 if (host->dma_channel != NO_DMA) {
435 if (request_dma(host->dma_channel, "powertec")) {
436 printk("scsi%d: DMA%d not free, using PIO\n",
437 host->host_no, host->dma_channel);
438 host->dma_channel = NO_DMA;
439 } else {
440 set_dma_speed(host->dma_channel, 180);
441 info->info.ifcfg.capabilities |= FASCAP_DMA;
442 }
443 }
444
445 ret = fas216_add(host);
446 if (ret == 0)
447 goto out;
448
449 if (host->dma_channel != NO_DMA)
450 free_dma(host->dma_channel);
451 free_irq(host->irq, host);
452
453 out_release:
454 fas216_release(host);
455
456 out_free:
457 scsi_unregister(host);
458
459 out_region:
460 release_region(base + POWERTEC_FAS216_OFFSET,
461 16 << POWERTEC_FAS216_SHIFT);
462
463 out:
464 return ret;
465 }
466
powertecscsi_remove(struct Scsi_Host * host)467 static void powertecscsi_remove(struct Scsi_Host *host)
468 {
469 struct powertec_info *info = (struct powertec_info *)host->hostdata;
470
471 fas216_remove(host);
472
473 if (host->dma_channel != NO_DMA)
474 free_dma(host->dma_channel);
475 free_irq(host->irq, info);
476
477 release_region(host->io_port + POWERTEC_FAS216_OFFSET,
478 16 << POWERTEC_FAS216_SHIFT);
479
480 fas216_release(host);
481 ecard_release(info->ec);
482 }
483
powertecscsi_init(void)484 static int __init powertecscsi_init(void)
485 {
486 scsi_register_module(MODULE_SCSI_HA, &powertecscsi_template);
487 if (powertecscsi_template.present)
488 return 0;
489
490 scsi_unregister_module(MODULE_SCSI_HA, &powertecscsi_template);
491 return -ENODEV;
492 }
493
powertecscsi_exit(void)494 static void __exit powertecscsi_exit(void)
495 {
496 scsi_unregister_module(MODULE_SCSI_HA, &powertecscsi_template);
497 }
498
499 module_init(powertecscsi_init);
500 module_exit(powertecscsi_exit);
501
502 MODULE_AUTHOR("Russell King");
503 MODULE_DESCRIPTION("Powertec SCSI driver");
504 MODULE_PARM(term, "1-8i");
505 MODULE_PARM_DESC(term, "SCSI bus termination");
506 MODULE_LICENSE("GPL");
507 EXPORT_NO_SYMBOLS;
508