1 // SPDX-License-Identifier: GPL-2.0-only
2 /* Low-level parallel port routines for the Multiface 3 card
14  * -------------------------
16  * 	The two open-drain interrupt outputs /IRQA and /IRQB are routed to
19  * 	The CPU data bus of the PIA (D0-D7) is connected to D8-D15 on the Z2
22  * Centronics Pin Connections for the PIA
23  * --------------------------------------
27  * very complete, Centronics type interface. The Pin column gives the pin
28  * numbers of the PIA. The Centronics pin numbers can be found in the section
32  *    Pin | PIA | Dir | Centronics Names
33  * -------+-----+-----+---------------------------------------------------------
34  *     19 | CB2 | --> | /STROBE (aka /DRDY)
35  *  10-17 | PBx | <-> | DATA0 - DATA7
36  *     18 | CB1 | <-- | /ACK
37  *     40 | CA1 | <-- | BUSY
38  *      3 | PA1 | <-- | PAPER-OUT (aka POUT)
39  *      4 | PA2 | <-- | SELECTED (aka SEL)
40  *      9 | PA7 | --> | /INIT (aka /RESET or /INPUT-PRIME)
41  *      6 | PA4 | <-- | /ERROR (aka /FAULT)
42  *      7 | PA5 | --> | DIR (aka /SELECT-IN)
43  *      8 | PA6 | --> | /AUTO-FEED-XT
44  *     39 | CA2 | --> | open
45  *      5 | PA3 | <-- | /ACK (same as CB1!)
46  *      2 | PA0 | <-- | BUSY (same as CA1!)
47  * -------+-----+-----+---------------------------------------------------------
75 static volatile int dummy; /* for trigger readds */
77 #define pia(dev) ((struct pia *)(dev->base))
84 	dummy = pia(p)->pprb; /* clears irq bit */  in mfc3_write_data()
86 	pia(p)->pprb = data;  in mfc3_write_data()
92 	return pia(p)->pprb;  in mfc3_read_data()
126 	pia(p)->ppra = (pia(p)->ppra & 0x1f) | control_pc_to_mfc3(control);  in mfc3_write_control()
132 	return control_mfc3_to_pc(pia(p)->ppra & 0xe0);  in mfc3_read_control()
167 	status = status_mfc3_to_pc(pia(p)->ppra & 0x1f);  in mfc3_read_status()
172 static int use_cnt;
174 static irqreturn_t mfc3_interrupt(int irq, void *dev_id)  in mfc3_interrupt()
176 	int i;  in mfc3_interrupt()
180 			if (pia(this_port[i])->crb & 128) { /* Board caused interrupt */  in mfc3_interrupt()
181 				dummy = pia(this_port[i])->pprb; /* clear irq bit */  in mfc3_interrupt()
189 	pia(p)->crb |= PIA_C1_ENABLE_IRQ;  in mfc3_enable_irq()
194 	pia(p)->crb &= ~PIA_C1_ENABLE_IRQ;  in mfc3_disable_irq()
200 	pia(p)->crb &= ~PIA_DDR; /* make data direction register visible */  in mfc3_data_forward()
201 	pia(p)->pddrb = 255; /* all pins output */  in mfc3_data_forward()
202 	pia(p)->crb |= PIA_DDR; /* make data register visible - default */  in mfc3_data_forward()
208 	pia(p)->crb &= ~PIA_DDR; /* make data direction register visible */  in mfc3_data_reverse()
209 	pia(p)->pddrb = 0; /* all pins input */  in mfc3_data_reverse()
210 	pia(p)->crb |= PIA_DDR; /* make data register visible - default */  in mfc3_data_reverse()
215 	s->u.amiga.data = 0;  in mfc3_init_state()
216 	s->u.amiga.datadir = 255;  in mfc3_init_state()
217 	s->u.amiga.status = 0;  in mfc3_init_state()
218 	s->u.amiga.statusdir = 0xe0;  in mfc3_init_state()
223 	s->u.amiga.data = pia(p)->pprb;  in mfc3_save_state()
224 	pia(p)->crb &= ~PIA_DDR;  in mfc3_save_state()
225 	s->u.amiga.datadir = pia(p)->pddrb;  in mfc3_save_state()
226 	pia(p)->crb |= PIA_DDR;  in mfc3_save_state()
227 	s->u.amiga.status = pia(p)->ppra;  in mfc3_save_state()
228 	pia(p)->cra &= ~PIA_DDR;  in mfc3_save_state()
229 	s->u.amiga.statusdir = pia(p)->pddrb;  in mfc3_save_state()
230 	pia(p)->cra |= PIA_DDR;  in mfc3_save_state()
235 	pia(p)->pprb = s->u.amiga.data;  in mfc3_restore_state()
236 	pia(p)->crb &= ~PIA_DDR;  in mfc3_restore_state()
237 	pia(p)->pddrb = s->u.amiga.datadir;  in mfc3_restore_state()
238 	pia(p)->crb |= PIA_DDR;  in mfc3_restore_state()
239 	pia(p)->ppra = s->u.amiga.status;  in mfc3_restore_state()
240 	pia(p)->cra &= ~PIA_DDR;  in mfc3_restore_state()
241 	pia(p)->pddrb = s->u.amiga.statusdir;  in mfc3_restore_state()
242 	pia(p)->cra |= PIA_DDR;  in mfc3_restore_state()
281 /* ----------- Initialisation code --------------------------------- */
283 static int __init parport_mfc3_init(void)  in parport_mfc3_init()
286 	int pias = 0;  in parport_mfc3_init()
291 		return -ENODEV;  in parport_mfc3_init()
294 		unsigned long piabase = z->resource.start+PIABASE;  in parport_mfc3_init()
299 		pp->crb = 0;  in parport_mfc3_init()
300 		pp->pddrb = 255; /* all data pins output */  in parport_mfc3_init()
301 		pp->crb = PIA_DDR|32|8;  in parport_mfc3_init()
302 		dummy = pp->pddrb; /* reading clears interrupt */  in parport_mfc3_init()
303 		pp->cra = 0;  in parport_mfc3_init()
304 		pp->pddra = 0xe0; /* /RESET,  /DIR ,/AUTO-FEED output */  in parport_mfc3_init()
305 		pp->cra = PIA_DDR;  in parport_mfc3_init()
306 		pp->ppra = 0; /* reset printer */  in parport_mfc3_init()
308 		pp->ppra = 128;  in parport_mfc3_init()
314 		if (p->irq != PARPORT_IRQ_NONE) {  in parport_mfc3_init()
316 				if (request_irq(IRQ_AMIGA_PORTS, mfc3_interrupt, IRQF_SHARED, p->name, &pp_mfc3_ops))  in parport_mfc3_init()
319 		p->dev = &z->dev;  in parport_mfc3_init()
322 		pr_info("%s: Multiface III port using irq\n", p->name);  in parport_mfc3_init()
325 		p->private_data = (void *)piabase;  in parport_mfc3_init()
338 	return pias ? 0 : -ENODEV;  in parport_mfc3_init()
343 	int i;  in parport_mfc3_exit()
349 		if (this_port[i]->irq != PARPORT_IRQ_NONE) {  in parport_mfc3_exit()
350 			if (--use_cnt == 0)   in parport_mfc3_exit()
353 		release_mem_region(ZTWO_PADDR(this_port[i]->private_data), sizeof(struct pia));  in parport_mfc3_exit()