1 // SPDX-License-Identifier: GPL-2.0-only
5  *  Copyright (C) 1997-2005 Russell King
8  *   30-08-1997	RMK	0.0.0	Created, READONLY version.
9  *   22-01-1998	RMK	0.0.1	Updated to 2.1.80.
10  *   15-04-1998	RMK	0.0.1	Only do PIO if FAS216 will allow it.
11  *   02-05-1998	RMK	0.0.2	Updated & added DMA support.
12  *   27-06-1998	RMK		Changed asm/delay.h to linux/delay.h
13  *   18-08-1998	RMK	0.0.3	Fixed synchronous transfer depth.
14  *   02-04-2000	RMK	0.0.4	Updated for new error handling code.
25 #include <linux/dma-mapping.h>
90  * Params   : ec    - expansion card structure
91  *          : irqnr - interrupt number
96 	struct cumanascsi2_info *info = ec->irq_data;  in cumanascsi_2_irqenable()
97 	writeb(ALATCH_ENA_INT, info->base + CUMANASCSI2_ALATCH);  in cumanascsi_2_irqenable()
102  * Params   : ec    - expansion card structure
103  *          : irqnr - interrupt number
108 	struct cumanascsi2_info *info = ec->irq_data;  in cumanascsi_2_irqdisable()
109 	writeb(ALATCH_DIS_INT, info->base + CUMANASCSI2_ALATCH);  in cumanascsi_2_irqdisable()
119  * Params   : host   - card to turn on/off
120  *          : on_off - !0 to turn on, 0 to turn off
125 	struct cumanascsi2_info *info = (struct cumanascsi2_info *)host->hostdata;  in cumanascsi_2_terminator_ctl()
128 		info->terms = 1;  in cumanascsi_2_terminator_ctl()
129 		writeb(ALATCH_ENA_TERM, info->base + CUMANASCSI2_ALATCH);  in cumanascsi_2_terminator_ctl()
131 		info->terms = 0;  in cumanascsi_2_terminator_ctl()
132 		writeb(ALATCH_DIS_TERM, info->base + CUMANASCSI2_ALATCH);  in cumanascsi_2_terminator_ctl()
138  * Params   : irq    - interrupt number
139  *	      dev_id - user-defined (Scsi_Host structure)
146 	return fas216_intr(&info->info);  in cumanascsi_2_intr()
150  * Purpose  : initialises DMA/PIO
151  * Params   : host      - host
152  *	      SCpnt     - command
153  *	      direction - DMA on to/off of card
154  *	      min_type  - minimum DMA support that we must have for this transfer
155  * Returns  : type of transfer to be performed
161 	struct cumanascsi2_info *info = (struct cumanascsi2_info *)host->hostdata;  in cumanascsi_2_dma_setup()
163 	int dmach = info->info.scsi.dma;  in cumanascsi_2_dma_setup()
165 	writeb(ALATCH_DIS_DMA, info->base + CUMANASCSI2_ALATCH);  in cumanascsi_2_dma_setup()
168 	    (min_type == fasdma_real_all || SCp->this_residual >= 512)) {  in cumanascsi_2_dma_setup()
171 		bufs = copy_SCp_to_sg(&info->sg[0], SCp, NR_SG);  in cumanascsi_2_dma_setup()
183 		dma_map_sg(dev, info->sg, bufs, map_dir);  in cumanascsi_2_dma_setup()
186 		set_dma_sg(dmach, info->sg, bufs);  in cumanascsi_2_dma_setup()
187 		writeb(alatch_dir, info->base + CUMANASCSI2_ALATCH);  in cumanascsi_2_dma_setup()
190 		writeb(ALATCH_ENA_DMA, info->base + CUMANASCSI2_ALATCH);  in cumanascsi_2_dma_setup()
191 		writeb(ALATCH_DIS_BIT32, info->base + CUMANASCSI2_ALATCH);  in cumanascsi_2_dma_setup()
203  * Prototype: void cumanascsi_2_dma_pseudo(host, SCpnt, direction, transfer)
205  * Params   : host      - host
206  *	      SCpnt     - command
207  *	      direction - DMA on to/off of card
208  *	      transfer  - minimum number of bytes we expect to transfer
212 			fasdmadir_t direction, int transfer)  in cumanascsi_2_dma_pseudo()  argument
214 	struct cumanascsi2_info *info = (struct cumanascsi2_info *)host->hostdata;  in cumanascsi_2_dma_pseudo()
218 	length = SCp->this_residual;  in cumanascsi_2_dma_pseudo()
219 	addr = SCp->ptr;  in cumanascsi_2_dma_pseudo()
225 			unsigned int status = readb(info->base + CUMANASCSI2_STATUS);  in cumanascsi_2_dma_pseudo()
234 			writew(word, info->base + CUMANASCSI2_PSEUDODMA);  in cumanascsi_2_dma_pseudo()
236 			length -= 2;  in cumanascsi_2_dma_pseudo()
242 		if (transfer && (transfer & 255)) {  in cumanascsi_2_dma_pseudo()
244 				unsigned int status = readb(info->base + CUMANASCSI2_STATUS);  in cumanascsi_2_dma_pseudo()
252 				readsw(info->base + CUMANASCSI2_PSEUDODMA,  in cumanascsi_2_dma_pseudo()
255 				length -= 256;  in cumanascsi_2_dma_pseudo()
261 			unsigned int status = readb(info->base + CUMANASCSI2_STATUS);  in cumanascsi_2_dma_pseudo()
269 			word = readw(info->base + CUMANASCSI2_PSEUDODMA);  in cumanascsi_2_dma_pseudo()
271 			if (--length > 0) {  in cumanascsi_2_dma_pseudo()
273 				length --;  in cumanascsi_2_dma_pseudo()
280  * Purpose  : stops DMA/PIO
281  * Params   : host  - host
282  *	      SCpnt - command
287 	struct cumanascsi2_info *info = (struct cumanascsi2_info *)host->hostdata;  in cumanascsi_2_dma_stop()
288 	if (info->info.scsi.dma != NO_DMA) {  in cumanascsi_2_dma_stop()
289 		writeb(ALATCH_DIS_DMA, info->base + CUMANASCSI2_ALATCH);  in cumanascsi_2_dma_stop()
290 		disable_dma(info->info.scsi.dma);  in cumanascsi_2_dma_stop()
296  * Params   : host - driver host structure to return info for.
301 	struct cumanascsi2_info *info = (struct cumanascsi2_info *)host->hostdata;  in cumanascsi_2_info()
305 		host->hostt->name, info->info.scsi.type, info->ec->slot_no,  in cumanascsi_2_info()
306 		VERSION, info->terms ? "n" : "ff");  in cumanascsi_2_info()
313  * Params   : host   - host to setup
314  *          : buffer - buffer containing string describing operation
315  *          : length - length of string
316  * Returns  : -EINVAL, or 0
325 		length -= 11;  in cumanascsi_2_set_proc_info()
333 				ret = -EINVAL;  in cumanascsi_2_set_proc_info()
335 			ret = -EINVAL;  in cumanascsi_2_set_proc_info()
338 		ret = -EINVAL;  in cumanascsi_2_set_proc_info()
347 	info = (struct cumanascsi2_info *)host->hostdata;  in cumanascsi_2_show_info()
350 	fas216_print_host(&info->info, m);  in cumanascsi_2_show_info()
352 			info->terms ? "n" : "ff");  in cumanascsi_2_show_info()
354 	fas216_print_stats(&info->info, m);  in cumanascsi_2_show_info()
355 	fas216_print_devices(&info->info, m);  in cumanascsi_2_show_info()
392 		ret = -ENOMEM;  in cumanascsi2_probe()
399 		ret = -ENOMEM;  in cumanascsi2_probe()
405 	info = (struct cumanascsi2_info *)host->hostdata;  in cumanascsi2_probe()
406 	info->ec	= ec;  in cumanascsi2_probe()
407 	info->base	= base;  in cumanascsi2_probe()
409 	cumanascsi_2_terminator_ctl(host, term[ec->slot_no]);  in cumanascsi2_probe()
411 	info->info.scsi.io_base		= base + CUMANASCSI2_FAS216_OFFSET;  in cumanascsi2_probe()
412 	info->info.scsi.io_shift	= CUMANASCSI2_FAS216_SHIFT;  in cumanascsi2_probe()
413 	info->info.scsi.irq		= ec->irq;  in cumanascsi2_probe()
414 	info->info.scsi.dma		= ec->dma;  in cumanascsi2_probe()
415 	info->info.ifcfg.clockrate	= 40; /* MHz */  in cumanascsi2_probe()
416 	info->info.ifcfg.select_timeout	= 255;  in cumanascsi2_probe()
417 	info->info.ifcfg.asyncperiod	= 200; /* ns */  in cumanascsi2_probe()
418 	info->info.ifcfg.sync_max_depth	= 7;  in cumanascsi2_probe()
419 	info->info.ifcfg.cntl3		= CNTL3_BS8 | CNTL3_FASTSCSI | CNTL3_FASTCLK;  in cumanascsi2_probe()
420 	info->info.ifcfg.disconnect_ok	= 1;  in cumanascsi2_probe()
421 	info->info.ifcfg.wide_max_size	= 0;  in cumanascsi2_probe()
422 	info->info.ifcfg.capabilities	= FASCAP_PSEUDODMA;  in cumanascsi2_probe()
423 	info->info.dma.setup		= cumanascsi_2_dma_setup;  in cumanascsi2_probe()
424 	info->info.dma.pseudo		= cumanascsi_2_dma_pseudo;  in cumanascsi2_probe()
425 	info->info.dma.stop		= cumanascsi_2_dma_stop;  in cumanascsi2_probe()
427 	ec->irqaddr	= info->base + CUMANASCSI2_STATUS;  in cumanascsi2_probe()
428 	ec->irqmask	= STATUS_INT;  in cumanascsi2_probe()
436 	ret = request_irq(ec->irq, cumanascsi_2_intr,  in cumanascsi2_probe()
440 		       host->host_no, ec->irq, ret);  in cumanascsi2_probe()
444 	if (info->info.scsi.dma != NO_DMA) {  in cumanascsi2_probe()
445 		if (request_dma(info->info.scsi.dma, "cumanascsi2")) {  in cumanascsi2_probe()
446 			printk("scsi%d: DMA%d not free, using PIO\n",  in cumanascsi2_probe()
447 			       host->host_no, info->info.scsi.dma);  in cumanascsi2_probe()
448 			info->info.scsi.dma = NO_DMA;  in cumanascsi2_probe()
450 			set_dma_speed(info->info.scsi.dma, 180);  in cumanascsi2_probe()
451 			info->info.ifcfg.capabilities |= FASCAP_DMA;  in cumanascsi2_probe()
455 	ret = fas216_add(host, &ec->dev);  in cumanascsi2_probe()
459 	if (info->info.scsi.dma != NO_DMA)  in cumanascsi2_probe()
460 		free_dma(info->info.scsi.dma);  in cumanascsi2_probe()
461 	free_irq(ec->irq, info);  in cumanascsi2_probe()
479 	struct cumanascsi2_info *info = (struct cumanascsi2_info *)host->hostdata;  in cumanascsi2_remove()
484 	if (info->info.scsi.dma != NO_DMA)  in cumanascsi2_remove()
485 		free_dma(info->info.scsi.dma);  in cumanascsi2_remove()
486 	free_irq(ec->irq, info);  in cumanascsi2_remove()
521 MODULE_DESCRIPTION("Cumana SCSI-2 driver for Acorn machines");