xref: /openbmc/linux/drivers/scsi/arm/eesox.c (revision 6e9b7cd6) 
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  */
68 static int term[MAX_ECARDS] = { 1, 1, 1, 1, 1, 1, 1, 1 };
69 
70 #define NR_SG	256
71 
72 struct 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  */
86 static void
87 eesoxscsi_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  */
101 static void
102 eesoxscsi_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 
111 static 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  */
121 static void
122 eesoxscsi_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  */
142 static irqreturn_t
143 eesoxscsi_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  */
158 static fasdmatype_t
159 eesoxscsi_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 
196 static 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 
274 static 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 
354 static void
355 eesoxscsi_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  */
371 static void
372 eesoxscsi_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  */
384 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  */
403 static int
404 eesoxscsi_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 
427 static 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 
443 static 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 
452 static 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 
473 static DEVICE_ATTR(bus_term, S_IRUGO | S_IWUSR,
474 		   eesoxscsi_show_term, eesoxscsi_store_term);
475 
476 static 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 
495 static 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 
596 static 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 
615 static const struct ecard_id eesoxscsi_cids[] = {
616 	{ MANU_EESOX, PROD_EESOX_SCSI2 },
617 	{ 0xffff, 0xffff },
618 };
619 
620 static 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 
629 static int __init eesox_init(void)
630 {
631 	return ecard_register_driver(&eesoxscsi_driver);
632 }
633 
634 static void __exit eesox_exit(void)
635 {
636 	ecard_remove_driver(&eesoxscsi_driver);
637 }
638 
639 module_init(eesox_init);
640 module_exit(eesox_exit);
641 
642 MODULE_AUTHOR("Russell King");
643 MODULE_DESCRIPTION("EESOX 'Fast' SCSI driver for Acorn machines");
644 module_param_array(term, int, NULL, 0);
645 MODULE_PARM_DESC(term, "SCSI bus termination");
646 MODULE_LICENSE("GPL");
647