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1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * linux/drivers/acorn/scsi/eesox.c
4 *
5 * Copyright (C) 1997-2005 Russell King
6 *
7 * This driver is based on experimentation. Hence, it may have made
8 * assumptions about the particular card that I have available, and
9 * may not be reliable!
10 *
11 * Changelog:
12 * 01-10-1997 RMK Created, READONLY version
13 * 15-02-1998 RMK READ/WRITE version
14 * added DMA support and hardware definitions
15 * 14-03-1998 RMK Updated DMA support
16 * Added terminator control
17 * 15-04-1998 RMK Only do PIO if FAS216 will allow it.
18 * 27-06-1998 RMK Changed asm/delay.h to linux/delay.h
19 * 02-04-2000 RMK 0.0.3 Fixed NO_IRQ/NO_DMA problem, updated for new
20 * error handling code.
21 */
22#include <linux/module.h>
23#include <linux/blkdev.h>
24#include <linux/kernel.h>
25#include <linux/string.h>
26#include <linux/ioport.h>
27#include <linux/proc_fs.h>
28#include <linux/delay.h>
29#include <linux/interrupt.h>
30#include <linux/init.h>
31#include <linux/dma-mapping.h>
32#include <linux/pgtable.h>
33
34#include <asm/io.h>
35#include <asm/dma.h>
36#include <asm/ecard.h>
37
38#include <scsi/scsi.h>
39#include <scsi/scsi_cmnd.h>
40#include <scsi/scsi_device.h>
41#include <scsi/scsi_eh.h>
42#include <scsi/scsi_host.h>
43#include <scsi/scsi_tcq.h>
44#include "fas216.h"
45#include "arm_scsi.h"
46
47#include <scsi/scsicam.h>
48
49#define EESOX_FAS216_OFFSET 0x3000
50#define EESOX_FAS216_SHIFT 5
51
52#define EESOX_DMASTAT 0x2800
53#define EESOX_STAT_INTR 0x01
54#define EESOX_STAT_DMA 0x02
55
56#define EESOX_CONTROL 0x2800
57#define EESOX_INTR_ENABLE 0x04
58#define EESOX_TERM_ENABLE 0x02
59#define EESOX_RESET 0x01
60
61#define EESOX_DMADATA 0x3800
62
63#define VERSION "1.10 (17/01/2003 2.5.59)"
64
65/*
66 * Use term=0,1,0,0,0 to turn terminators on/off
67 */
68static int term[MAX_ECARDS] = { 1, 1, 1, 1, 1, 1, 1, 1 };
69
70#define NR_SG 256
71
72struct eesoxscsi_info {
73 FAS216_Info info;
74 struct expansion_card *ec;
75 void __iomem *base;
76 void __iomem *ctl_port;
77 unsigned int control;
78 struct scatterlist sg[NR_SG]; /* Scatter DMA list */
79};
80
81/* Prototype: void eesoxscsi_irqenable(ec, irqnr)
82 * Purpose : Enable interrupts on EESOX SCSI card
83 * Params : ec - expansion card structure
84 * : irqnr - interrupt number
85 */
86static void
87eesoxscsi_irqenable(struct expansion_card *ec, int irqnr)
88{
89 struct eesoxscsi_info *info = (struct eesoxscsi_info *)ec->irq_data;
90
91 info->control |= EESOX_INTR_ENABLE;
92
93 writeb(info->control, info->ctl_port);
94}
95
96/* Prototype: void eesoxscsi_irqdisable(ec, irqnr)
97 * Purpose : Disable interrupts on EESOX SCSI card
98 * Params : ec - expansion card structure
99 * : irqnr - interrupt number
100 */
101static void
102eesoxscsi_irqdisable(struct expansion_card *ec, int irqnr)
103{
104 struct eesoxscsi_info *info = (struct eesoxscsi_info *)ec->irq_data;
105
106 info->control &= ~EESOX_INTR_ENABLE;
107
108 writeb(info->control, info->ctl_port);
109}
110
111static const expansioncard_ops_t eesoxscsi_ops = {
112 .irqenable = eesoxscsi_irqenable,
113 .irqdisable = eesoxscsi_irqdisable,
114};
115
116/* Prototype: void eesoxscsi_terminator_ctl(*host, on_off)
117 * Purpose : Turn the EESOX SCSI terminators on or off
118 * Params : host - card to turn on/off
119 * : on_off - !0 to turn on, 0 to turn off
120 */
121static void
122eesoxscsi_terminator_ctl(struct Scsi_Host *host, int on_off)
123{
124 struct eesoxscsi_info *info = (struct eesoxscsi_info *)host->hostdata;
125 unsigned long flags;
126
127 spin_lock_irqsave(host->host_lock, flags);
128 if (on_off)
129 info->control |= EESOX_TERM_ENABLE;
130 else
131 info->control &= ~EESOX_TERM_ENABLE;
132
133 writeb(info->control, info->ctl_port);
134 spin_unlock_irqrestore(host->host_lock, flags);
135}
136
137/* Prototype: void eesoxscsi_intr(irq, *dev_id, *regs)
138 * Purpose : handle interrupts from EESOX SCSI card
139 * Params : irq - interrupt number
140 * dev_id - user-defined (Scsi_Host structure)
141 */
142static irqreturn_t
143eesoxscsi_intr(int irq, void *dev_id)
144{
145 struct eesoxscsi_info *info = dev_id;
146
147 return fas216_intr(&info->info);
148}
149
150/* Prototype: fasdmatype_t eesoxscsi_dma_setup(host, SCpnt, direction, min_type)
151 * Purpose : initialises DMA/PIO
152 * Params : host - host
153 * SCpnt - command
154 * direction - DMA on to/off of card
155 * min_type - minimum DMA support that we must have for this transfer
156 * Returns : type of transfer to be performed
157 */
158static fasdmatype_t
159eesoxscsi_dma_setup(struct Scsi_Host *host, struct scsi_pointer *SCp,
160 fasdmadir_t direction, fasdmatype_t min_type)
161{
162 struct eesoxscsi_info *info = (struct eesoxscsi_info *)host->hostdata;
163 struct device *dev = scsi_get_device(host);
164 int dmach = info->info.scsi.dma;
165
166 if (dmach != NO_DMA &&
167 (min_type == fasdma_real_all || SCp->this_residual >= 512)) {
168 int bufs, map_dir, dma_dir;
169
170 bufs = copy_SCp_to_sg(&info->sg[0], SCp, NR_SG);
171
172 if (direction == DMA_OUT) {
173 map_dir = DMA_TO_DEVICE;
174 dma_dir = DMA_MODE_WRITE;
175 } else {
176 map_dir = DMA_FROM_DEVICE;
177 dma_dir = DMA_MODE_READ;
178 }
179
180 dma_map_sg(dev, info->sg, bufs, map_dir);
181
182 disable_dma(dmach);
183 set_dma_sg(dmach, info->sg, bufs);
184 set_dma_mode(dmach, dma_dir);
185 enable_dma(dmach);
186 return fasdma_real_all;
187 }
188 /*
189 * We don't do DMA, we only do slow PIO
190 *
191 * Some day, we will do Pseudo DMA
192 */
193 return fasdma_pseudo;
194}
195
196static void eesoxscsi_buffer_in(void *buf, int length, void __iomem *base)
197{
198 const void __iomem *reg_fas = base + EESOX_FAS216_OFFSET;
199 const void __iomem *reg_dmastat = base + EESOX_DMASTAT;
200 const void __iomem *reg_dmadata = base + EESOX_DMADATA;
201 register const unsigned long mask = 0xffff;
202
203 do {
204 unsigned int status;
205
206 /*
207 * Interrupt request?
208 */
209 status = readb(reg_fas + (REG_STAT << EESOX_FAS216_SHIFT));
210 if (status & STAT_INT)
211 break;
212
213 /*
214 * DMA request active?
215 */
216 status = readb(reg_dmastat);
217 if (!(status & EESOX_STAT_DMA))
218 continue;
219
220 /*
221 * Get number of bytes in FIFO
222 */
223 status = readb(reg_fas + (REG_CFIS << EESOX_FAS216_SHIFT)) & CFIS_CF;
224 if (status > 16)
225 status = 16;
226 if (status > length)
227 status = length;
228
229 /*
230 * Align buffer.
231 */
232 if (((u32)buf) & 2 && status >= 2) {
233 *(u16 *)buf = readl(reg_dmadata);
234 buf += 2;
235 status -= 2;
236 length -= 2;
237 }
238
239 if (status >= 8) {
240 unsigned long l1, l2;
241
242 l1 = readl(reg_dmadata) & mask;
243 l1 |= readl(reg_dmadata) << 16;
244 l2 = readl(reg_dmadata) & mask;
245 l2 |= readl(reg_dmadata) << 16;
246 *(u32 *)buf = l1;
247 buf += 4;
248 *(u32 *)buf = l2;
249 buf += 4;
250 length -= 8;
251 continue;
252 }
253
254 if (status >= 4) {
255 unsigned long l1;
256
257 l1 = readl(reg_dmadata) & mask;
258 l1 |= readl(reg_dmadata) << 16;
259
260 *(u32 *)buf = l1;
261 buf += 4;
262 length -= 4;
263 continue;
264 }
265
266 if (status >= 2) {
267 *(u16 *)buf = readl(reg_dmadata);
268 buf += 2;
269 length -= 2;
270 }
271 } while (length);
272}
273
274static void eesoxscsi_buffer_out(void *buf, int length, void __iomem *base)
275{
276 const void __iomem *reg_fas = base + EESOX_FAS216_OFFSET;
277 const void __iomem *reg_dmastat = base + EESOX_DMASTAT;
278 void __iomem *reg_dmadata = base + EESOX_DMADATA;
279
280 do {
281 unsigned int status;
282
283 /*
284 * Interrupt request?
285 */
286 status = readb(reg_fas + (REG_STAT << EESOX_FAS216_SHIFT));
287 if (status & STAT_INT)
288 break;
289
290 /*
291 * DMA request active?
292 */
293 status = readb(reg_dmastat);
294 if (!(status & EESOX_STAT_DMA))
295 continue;
296
297 /*
298 * Get number of bytes in FIFO
299 */
300 status = readb(reg_fas + (REG_CFIS << EESOX_FAS216_SHIFT)) & CFIS_CF;
301 if (status > 16)
302 status = 16;
303 status = 16 - status;
304 if (status > length)
305 status = length;
306 status &= ~1;
307
308 /*
309 * Align buffer.
310 */
311 if (((u32)buf) & 2 && status >= 2) {
312 writel(*(u16 *)buf << 16, reg_dmadata);
313 buf += 2;
314 status -= 2;
315 length -= 2;
316 }
317
318 if (status >= 8) {
319 unsigned long l1, l2;
320
321 l1 = *(u32 *)buf;
322 buf += 4;
323 l2 = *(u32 *)buf;
324 buf += 4;
325
326 writel(l1 << 16, reg_dmadata);
327 writel(l1, reg_dmadata);
328 writel(l2 << 16, reg_dmadata);
329 writel(l2, reg_dmadata);
330 length -= 8;
331 continue;
332 }
333
334 if (status >= 4) {
335 unsigned long l1;
336
337 l1 = *(u32 *)buf;
338 buf += 4;
339
340 writel(l1 << 16, reg_dmadata);
341 writel(l1, reg_dmadata);
342 length -= 4;
343 continue;
344 }
345
346 if (status >= 2) {
347 writel(*(u16 *)buf << 16, reg_dmadata);
348 buf += 2;
349 length -= 2;
350 }
351 } while (length);
352}
353
354static void
355eesoxscsi_dma_pseudo(struct Scsi_Host *host, struct scsi_pointer *SCp,
356 fasdmadir_t dir, int transfer_size)
357{
358 struct eesoxscsi_info *info = (struct eesoxscsi_info *)host->hostdata;
359 if (dir == DMA_IN) {
360 eesoxscsi_buffer_in(SCp->ptr, SCp->this_residual, info->base);
361 } else {
362 eesoxscsi_buffer_out(SCp->ptr, SCp->this_residual, info->base);
363 }
364}
365
366/* Prototype: int eesoxscsi_dma_stop(host, SCpnt)
367 * Purpose : stops DMA/PIO
368 * Params : host - host
369 * SCpnt - command
370 */
371static void
372eesoxscsi_dma_stop(struct Scsi_Host *host, struct scsi_pointer *SCp)
373{
374 struct eesoxscsi_info *info = (struct eesoxscsi_info *)host->hostdata;
375 if (info->info.scsi.dma != NO_DMA)
376 disable_dma(info->info.scsi.dma);
377}
378
379/* Prototype: const char *eesoxscsi_info(struct Scsi_Host * host)
380 * Purpose : returns a descriptive string about this interface,
381 * Params : host - driver host structure to return info for.
382 * Returns : pointer to a static buffer containing null terminated string.
383 */
384static const char *eesoxscsi_info(struct Scsi_Host *host)
385{
386 struct eesoxscsi_info *info = (struct eesoxscsi_info *)host->hostdata;
387 static char string[150];
388
389 sprintf(string, "%s (%s) in slot %d v%s terminators o%s",
390 host->hostt->name, info->info.scsi.type, info->ec->slot_no,
391 VERSION, info->control & EESOX_TERM_ENABLE ? "n" : "ff");
392
393 return string;
394}
395
396/* Prototype: int eesoxscsi_set_proc_info(struct Scsi_Host *host, char *buffer, int length)
397 * Purpose : Set a driver specific function
398 * Params : host - host to setup
399 * : buffer - buffer containing string describing operation
400 * : length - length of string
401 * Returns : -EINVAL, or 0
402 */
403static int
404eesoxscsi_set_proc_info(struct Scsi_Host *host, char *buffer, int length)
405{
406 int ret = length;
407
408 if (length >= 9 && strncmp(buffer, "EESOXSCSI", 9) == 0) {
409 buffer += 9;
410 length -= 9;
411
412 if (length >= 5 && strncmp(buffer, "term=", 5) == 0) {
413 if (buffer[5] == '1')
414 eesoxscsi_terminator_ctl(host, 1);
415 else if (buffer[5] == '0')
416 eesoxscsi_terminator_ctl(host, 0);
417 else
418 ret = -EINVAL;
419 } else
420 ret = -EINVAL;
421 } else
422 ret = -EINVAL;
423
424 return ret;
425}
426
427static int eesoxscsi_show_info(struct seq_file *m, struct Scsi_Host *host)
428{
429 struct eesoxscsi_info *info;
430
431 info = (struct eesoxscsi_info *)host->hostdata;
432
433 seq_printf(m, "EESOX SCSI driver v%s\n", VERSION);
434 fas216_print_host(&info->info, m);
435 seq_printf(m, "Term : o%s\n",
436 info->control & EESOX_TERM_ENABLE ? "n" : "ff");
437
438 fas216_print_stats(&info->info, m);
439 fas216_print_devices(&info->info, m);
440 return 0;
441}
442
443static ssize_t eesoxscsi_show_term(struct device *dev, struct device_attribute *attr, char *buf)
444{
445 struct expansion_card *ec = ECARD_DEV(dev);
446 struct Scsi_Host *host = ecard_get_drvdata(ec);
447 struct eesoxscsi_info *info = (struct eesoxscsi_info *)host->hostdata;
448
449 return sprintf(buf, "%d\n", info->control & EESOX_TERM_ENABLE ? 1 : 0);
450}
451
452static ssize_t eesoxscsi_store_term(struct device *dev, struct device_attribute *attr, const char *buf, size_t len)
453{
454 struct expansion_card *ec = ECARD_DEV(dev);
455 struct Scsi_Host *host = ecard_get_drvdata(ec);
456 struct eesoxscsi_info *info = (struct eesoxscsi_info *)host->hostdata;
457 unsigned long flags;
458
459 if (len > 1) {
460 spin_lock_irqsave(host->host_lock, flags);
461 if (buf[0] != '0') {
462 info->control |= EESOX_TERM_ENABLE;
463 } else {
464 info->control &= ~EESOX_TERM_ENABLE;
465 }
466 writeb(info->control, info->ctl_port);
467 spin_unlock_irqrestore(host->host_lock, flags);
468 }
469
470 return len;
471}
472
473static DEVICE_ATTR(bus_term, S_IRUGO | S_IWUSR,
474 eesoxscsi_show_term, eesoxscsi_store_term);
475
476static const struct scsi_host_template eesox_template = {
477 .module = THIS_MODULE,
478 .show_info = eesoxscsi_show_info,
479 .write_info = eesoxscsi_set_proc_info,
480 .name = "EESOX SCSI",
481 .info = eesoxscsi_info,
482 .queuecommand = fas216_queue_command,
483 .eh_host_reset_handler = fas216_eh_host_reset,
484 .eh_bus_reset_handler = fas216_eh_bus_reset,
485 .eh_device_reset_handler = fas216_eh_device_reset,
486 .eh_abort_handler = fas216_eh_abort,
487 .cmd_size = sizeof(struct fas216_cmd_priv),
488 .can_queue = 1,
489 .this_id = 7,
490 .sg_tablesize = SG_MAX_SEGMENTS,
491 .dma_boundary = IOMD_DMA_BOUNDARY,
492 .proc_name = "eesox",
493};
494
495static int eesoxscsi_probe(struct expansion_card *ec, const struct ecard_id *id)
496{
497 struct Scsi_Host *host;
498 struct eesoxscsi_info *info;
499 void __iomem *base;
500 int ret;
501
502 ret = ecard_request_resources(ec);
503 if (ret)
504 goto out;
505
506 base = ecardm_iomap(ec, ECARD_RES_IOCFAST, 0, 0);
507 if (!base) {
508 ret = -ENOMEM;
509 goto out_region;
510 }
511
512 host = scsi_host_alloc(&eesox_template,
513 sizeof(struct eesoxscsi_info));
514 if (!host) {
515 ret = -ENOMEM;
516 goto out_region;
517 }
518
519 ecard_set_drvdata(ec, host);
520
521 info = (struct eesoxscsi_info *)host->hostdata;
522 info->ec = ec;
523 info->base = base;
524 info->ctl_port = base + EESOX_CONTROL;
525 info->control = term[ec->slot_no] ? EESOX_TERM_ENABLE : 0;
526 writeb(info->control, info->ctl_port);
527
528 info->info.scsi.io_base = base + EESOX_FAS216_OFFSET;
529 info->info.scsi.io_shift = EESOX_FAS216_SHIFT;
530 info->info.scsi.irq = ec->irq;
531 info->info.scsi.dma = ec->dma;
532 info->info.ifcfg.clockrate = 40; /* MHz */
533 info->info.ifcfg.select_timeout = 255;
534 info->info.ifcfg.asyncperiod = 200; /* ns */
535 info->info.ifcfg.sync_max_depth = 7;
536 info->info.ifcfg.cntl3 = CNTL3_FASTSCSI | CNTL3_FASTCLK;
537 info->info.ifcfg.disconnect_ok = 1;
538 info->info.ifcfg.wide_max_size = 0;
539 info->info.ifcfg.capabilities = FASCAP_PSEUDODMA;
540 info->info.dma.setup = eesoxscsi_dma_setup;
541 info->info.dma.pseudo = eesoxscsi_dma_pseudo;
542 info->info.dma.stop = eesoxscsi_dma_stop;
543
544 ec->irqaddr = base + EESOX_DMASTAT;
545 ec->irqmask = EESOX_STAT_INTR;
546
547 ecard_setirq(ec, &eesoxscsi_ops, info);
548
549 device_create_file(&ec->dev, &dev_attr_bus_term);
550
551 ret = fas216_init(host);
552 if (ret)
553 goto out_free;
554
555 ret = request_irq(ec->irq, eesoxscsi_intr, 0, "eesoxscsi", info);
556 if (ret) {
557 printk("scsi%d: IRQ%d not free: %d\n",
558 host->host_no, ec->irq, ret);
559 goto out_remove;
560 }
561
562 if (info->info.scsi.dma != NO_DMA) {
563 if (request_dma(info->info.scsi.dma, "eesox")) {
564 printk("scsi%d: DMA%d not free, DMA disabled\n",
565 host->host_no, info->info.scsi.dma);
566 info->info.scsi.dma = NO_DMA;
567 } else {
568 set_dma_speed(info->info.scsi.dma, 180);
569 info->info.ifcfg.capabilities |= FASCAP_DMA;
570 info->info.ifcfg.cntl3 |= CNTL3_BS8;
571 }
572 }
573
574 ret = fas216_add(host, &ec->dev);
575 if (ret == 0)
576 goto out;
577
578 if (info->info.scsi.dma != NO_DMA)
579 free_dma(info->info.scsi.dma);
580 free_irq(ec->irq, info);
581
582 out_remove:
583 fas216_remove(host);
584
585 out_free:
586 device_remove_file(&ec->dev, &dev_attr_bus_term);
587 scsi_host_put(host);
588
589 out_region:
590 ecard_release_resources(ec);
591
592 out:
593 return ret;
594}
595
596static void eesoxscsi_remove(struct expansion_card *ec)
597{
598 struct Scsi_Host *host = ecard_get_drvdata(ec);
599 struct eesoxscsi_info *info = (struct eesoxscsi_info *)host->hostdata;
600
601 ecard_set_drvdata(ec, NULL);
602 fas216_remove(host);
603
604 if (info->info.scsi.dma != NO_DMA)
605 free_dma(info->info.scsi.dma);
606 free_irq(ec->irq, info);
607
608 device_remove_file(&ec->dev, &dev_attr_bus_term);
609
610 fas216_release(host);
611 scsi_host_put(host);
612 ecard_release_resources(ec);
613}
614
615static const struct ecard_id eesoxscsi_cids[] = {
616 { MANU_EESOX, PROD_EESOX_SCSI2 },
617 { 0xffff, 0xffff },
618};
619
620static struct ecard_driver eesoxscsi_driver = {
621 .probe = eesoxscsi_probe,
622 .remove = eesoxscsi_remove,
623 .id_table = eesoxscsi_cids,
624 .drv = {
625 .name = "eesoxscsi",
626 },
627};
628
629static int __init eesox_init(void)
630{
631 return ecard_register_driver(&eesoxscsi_driver);
632}
633
634static void __exit eesox_exit(void)
635{
636 ecard_remove_driver(&eesoxscsi_driver);
637}
638
639module_init(eesox_init);
640module_exit(eesox_exit);
641
642MODULE_AUTHOR("Russell King");
643MODULE_DESCRIPTION("EESOX 'Fast' SCSI driver for Acorn machines");
644module_param_array(term, int, NULL, 0);
645MODULE_PARM_DESC(term, "SCSI bus termination");
646MODULE_LICENSE("GPL");