1 /* Low-level parallel port routines for the Multiface 3 card
2  *
3  * Author: Joerg Dorchain <joerg@dorchain.net>
4  *
5  * (C) The elitist m68k Users(TM)
6  *
7  * based on the existing parport_amiga and lp_mfc
8  *
9  *
10  * From the MFC3 documentation:
11  *
12  * Miscellaneous PIA Details
13  * -------------------------
14  *
15  * 	The two open-drain interrupt outputs /IRQA and /IRQB are routed to
16  * /INT2 of the Z2 bus.
17  *
18  * 	The CPU data bus of the PIA (D0-D7) is connected to D8-D15 on the Z2
19  * bus. This means that any PIA registers are accessed at even addresses.
20  *
21  * Centronics Pin Connections for the PIA
22  * --------------------------------------
23  *
24  * 	The following table shows the connections between the PIA and the
25  * Centronics interface connector. These connections implement a single, but
26  * very complete, Centronics type interface. The Pin column gives the pin
27  * numbers of the PIA. The Centronics pin numbers can be found in the section
28  * "Parallel Connectors".
29  *
30  *
31  *    Pin | PIA | Dir | Centronics Names
32  * -------+-----+-----+---------------------------------------------------------
33  *     19 | CB2 | --> | /STROBE (aka /DRDY)
34  *  10-17 | PBx | <-> | DATA0 - DATA7
35  *     18 | CB1 | <-- | /ACK
36  *     40 | CA1 | <-- | BUSY
37  *      3 | PA1 | <-- | PAPER-OUT (aka POUT)
38  *      4 | PA2 | <-- | SELECTED (aka SEL)
39  *      9 | PA7 | --> | /INIT (aka /RESET or /INPUT-PRIME)
40  *      6 | PA4 | <-- | /ERROR (aka /FAULT)
41  *      7 | PA5 | --> | DIR (aka /SELECT-IN)
42  *      8 | PA6 | --> | /AUTO-FEED-XT
43  *     39 | CA2 | --> | open
44  *      5 | PA3 | <-- | /ACK (same as CB1!)
45  *      2 | PA0 | <-- | BUSY (same as CA1!)
46  * -------+-----+-----+---------------------------------------------------------
47  *
48  * Should be enough to understand some of the driver.
49  *
50  * Per convention for normal use the port registers are visible.
51  * If you need the data direction registers, restore the value in the
52  * control register.
53  */
54 
55 #include "multiface.h"
56 #include <linux/module.h>
57 #include <linux/init.h>
58 #include <linux/parport.h>
59 #include <linux/delay.h>
60 #include <linux/mc6821.h>
61 #include <linux/zorro.h>
62 #include <linux/interrupt.h>
63 #include <asm/setup.h>
64 #include <asm/amigahw.h>
65 #include <asm/irq.h>
66 #include <asm/amigaints.h>
67 
68 /* Maximum Number of Cards supported */
69 #define MAX_MFC 5
70 
71 #undef DEBUG
72 #ifdef DEBUG
73 #define DPRINTK printk
74 #else
75 static inline int DPRINTK(void *nothing, ...) {return 0;}
76 #endif
77 
78 static struct parport *this_port[MAX_MFC] = {NULL, };
79 static volatile int dummy; /* for trigger readds */
80 
81 #define pia(dev) ((struct pia *)(dev->base))
82 static struct parport_operations pp_mfc3_ops;
83 
84 static void mfc3_write_data(struct parport *p, unsigned char data)
85 {
86 DPRINTK(KERN_DEBUG "write_data %c\n",data);
87 
88 	dummy = pia(p)->pprb; /* clears irq bit */
89 	/* Triggers also /STROBE.*/
90 	pia(p)->pprb = data;
91 }
92 
93 static unsigned char mfc3_read_data(struct parport *p)
94 {
95 	/* clears interrupt bit. Triggers also /STROBE. */
96 	return pia(p)->pprb;
97 }
98 
99 static unsigned char control_pc_to_mfc3(unsigned char control)
100 {
101 	unsigned char ret = 32|64;
102 
103 	if (control & PARPORT_CONTROL_SELECT) /* XXX: What is SELECP? */
104 		ret &= ~32; /* /SELECT_IN */
105 	if (control & PARPORT_CONTROL_INIT) /* INITP */
106 		ret |= 128;
107 	if (control & PARPORT_CONTROL_AUTOFD) /* AUTOLF */
108 		ret &= ~64;
109 	if (control & PARPORT_CONTROL_STROBE) /* Strobe */
110 		/* Handled directly by hardware */;
111 	return ret;
112 }
113 
114 static unsigned char control_mfc3_to_pc(unsigned char control)
115 {
116 	unsigned char ret = PARPORT_CONTROL_STROBE
117 			  | PARPORT_CONTROL_AUTOFD | PARPORT_CONTROL_SELECT;
118 
119 	if (control & 128) /* /INITP */
120 		ret |= PARPORT_CONTROL_INIT;
121 	if (control & 64) /* /AUTOLF */
122 		ret &= ~PARPORT_CONTROL_AUTOFD;
123 	if (control & 32) /* /SELECT_IN */
124 		ret &= ~PARPORT_CONTROL_SELECT;
125 	return ret;
126 }
127 
128 static void mfc3_write_control(struct parport *p, unsigned char control)
129 {
130 DPRINTK(KERN_DEBUG "write_control %02x\n",control);
131 	pia(p)->ppra = (pia(p)->ppra & 0x1f) | control_pc_to_mfc3(control);
132 }
133 
134 static unsigned char mfc3_read_control( struct parport *p)
135 {
136 DPRINTK(KERN_DEBUG "read_control \n");
137 	return control_mfc3_to_pc(pia(p)->ppra & 0xe0);
138 }
139 
140 static unsigned char mfc3_frob_control( struct parport *p, unsigned char mask, unsigned char val)
141 {
142 	unsigned char old;
143 
144 DPRINTK(KERN_DEBUG "frob_control mask %02x, value %02x\n",mask,val);
145 	old = mfc3_read_control(p);
146 	mfc3_write_control(p, (old & ~mask) ^ val);
147 	return old;
148 }
149 
150 static unsigned char status_mfc3_to_pc(unsigned char status)
151 {
152 	unsigned char ret = PARPORT_STATUS_BUSY;
153 
154 	if (status & 1) /* Busy */
155 		ret &= ~PARPORT_STATUS_BUSY;
156 	if (status & 2) /* PaperOut */
157 		ret |= PARPORT_STATUS_PAPEROUT;
158 	if (status & 4) /* Selected */
159 		ret |= PARPORT_STATUS_SELECT;
160 	if (status & 8) /* Ack */
161 		ret |= PARPORT_STATUS_ACK;
162 	if (status & 16) /* /ERROR */
163 		ret |= PARPORT_STATUS_ERROR;
164 
165 	return ret;
166 }
167 
168 static unsigned char mfc3_read_status(struct parport *p)
169 {
170 	unsigned char status;
171 
172 	status = status_mfc3_to_pc(pia(p)->ppra & 0x1f);
173 DPRINTK(KERN_DEBUG "read_status %02x\n", status);
174 	return status;
175 }
176 
177 static int use_cnt = 0;
178 
179 static irqreturn_t mfc3_interrupt(int irq, void *dev_id)
180 {
181 	int i;
182 
183 	for( i = 0; i < MAX_MFC; i++)
184 		if (this_port[i] != NULL)
185 			if (pia(this_port[i])->crb & 128) { /* Board caused interrupt */
186 				dummy = pia(this_port[i])->pprb; /* clear irq bit */
187 				parport_generic_irq(this_port[i]);
188 			}
189 	return IRQ_HANDLED;
190 }
191 
192 static void mfc3_enable_irq(struct parport *p)
193 {
194 	pia(p)->crb |= PIA_C1_ENABLE_IRQ;
195 }
196 
197 static void mfc3_disable_irq(struct parport *p)
198 {
199 	pia(p)->crb &= ~PIA_C1_ENABLE_IRQ;
200 }
201 
202 static void mfc3_data_forward(struct parport *p)
203 {
204 	DPRINTK(KERN_DEBUG "forward\n");
205 	pia(p)->crb &= ~PIA_DDR; /* make data direction register visible */
206 	pia(p)->pddrb = 255; /* all pins output */
207 	pia(p)->crb |= PIA_DDR; /* make data register visible - default */
208 }
209 
210 static void mfc3_data_reverse(struct parport *p)
211 {
212 	DPRINTK(KERN_DEBUG "reverse\n");
213 	pia(p)->crb &= ~PIA_DDR; /* make data direction register visible */
214 	pia(p)->pddrb = 0; /* all pins input */
215 	pia(p)->crb |= PIA_DDR; /* make data register visible - default */
216 }
217 
218 static void mfc3_init_state(struct pardevice *dev, struct parport_state *s)
219 {
220 	s->u.amiga.data = 0;
221 	s->u.amiga.datadir = 255;
222 	s->u.amiga.status = 0;
223 	s->u.amiga.statusdir = 0xe0;
224 }
225 
226 static void mfc3_save_state(struct parport *p, struct parport_state *s)
227 {
228 	s->u.amiga.data = pia(p)->pprb;
229 	pia(p)->crb &= ~PIA_DDR;
230 	s->u.amiga.datadir = pia(p)->pddrb;
231 	pia(p)->crb |= PIA_DDR;
232 	s->u.amiga.status = pia(p)->ppra;
233 	pia(p)->cra &= ~PIA_DDR;
234 	s->u.amiga.statusdir = pia(p)->pddrb;
235 	pia(p)->cra |= PIA_DDR;
236 }
237 
238 static void mfc3_restore_state(struct parport *p, struct parport_state *s)
239 {
240 	pia(p)->pprb = s->u.amiga.data;
241 	pia(p)->crb &= ~PIA_DDR;
242 	pia(p)->pddrb = s->u.amiga.datadir;
243 	pia(p)->crb |= PIA_DDR;
244 	pia(p)->ppra = s->u.amiga.status;
245 	pia(p)->cra &= ~PIA_DDR;
246 	pia(p)->pddrb = s->u.amiga.statusdir;
247 	pia(p)->cra |= PIA_DDR;
248 }
249 
250 static struct parport_operations pp_mfc3_ops = {
251 	.write_data	= mfc3_write_data,
252 	.read_data	= mfc3_read_data,
253 
254 	.write_control	= mfc3_write_control,
255 	.read_control	= mfc3_read_control,
256 	.frob_control	= mfc3_frob_control,
257 
258 	.read_status	= mfc3_read_status,
259 
260 	.enable_irq	= mfc3_enable_irq,
261 	.disable_irq	= mfc3_disable_irq,
262 
263 	.data_forward	= mfc3_data_forward,
264 	.data_reverse	= mfc3_data_reverse,
265 
266 	.init_state	= mfc3_init_state,
267 	.save_state	= mfc3_save_state,
268 	.restore_state	= mfc3_restore_state,
269 
270 	.epp_write_data	= parport_ieee1284_epp_write_data,
271 	.epp_read_data	= parport_ieee1284_epp_read_data,
272 	.epp_write_addr	= parport_ieee1284_epp_write_addr,
273 	.epp_read_addr	= parport_ieee1284_epp_read_addr,
274 
275 	.ecp_write_data	= parport_ieee1284_ecp_write_data,
276 	.ecp_read_data	= parport_ieee1284_ecp_read_data,
277 	.ecp_write_addr	= parport_ieee1284_ecp_write_addr,
278 
279 	.compat_write_data	= parport_ieee1284_write_compat,
280 	.nibble_read_data	= parport_ieee1284_read_nibble,
281 	.byte_read_data		= parport_ieee1284_read_byte,
282 
283 	.owner		= THIS_MODULE,
284 };
285 
286 /* ----------- Initialisation code --------------------------------- */
287 
288 static int __init parport_mfc3_init(void)
289 {
290 	struct parport *p;
291 	int pias = 0;
292 	struct pia *pp;
293 	struct zorro_dev *z = NULL;
294 
295 	if (!MACH_IS_AMIGA)
296 		return -ENODEV;
297 
298 	while ((z = zorro_find_device(ZORRO_PROD_BSC_MULTIFACE_III, z))) {
299 		unsigned long piabase = z->resource.start+PIABASE;
300 		if (!request_mem_region(piabase, sizeof(struct pia), "PIA"))
301 			continue;
302 
303 		pp = ZTWO_VADDR(piabase);
304 		pp->crb = 0;
305 		pp->pddrb = 255; /* all data pins output */
306 		pp->crb = PIA_DDR|32|8;
307 		dummy = pp->pddrb; /* reading clears interrupt */
308 		pp->cra = 0;
309 		pp->pddra = 0xe0; /* /RESET,  /DIR ,/AUTO-FEED output */
310 		pp->cra = PIA_DDR;
311 		pp->ppra = 0; /* reset printer */
312 		udelay(10);
313 		pp->ppra = 128;
314 		p = parport_register_port((unsigned long)pp, IRQ_AMIGA_PORTS,
315 					  PARPORT_DMA_NONE, &pp_mfc3_ops);
316 		if (!p)
317 			goto out_port;
318 
319 		if (p->irq != PARPORT_IRQ_NONE) {
320 			if (use_cnt++ == 0)
321 				if (request_irq(IRQ_AMIGA_PORTS, mfc3_interrupt, IRQF_SHARED, p->name, &pp_mfc3_ops))
322 					goto out_irq;
323 		}
324 		p->dev = &z->dev;
325 
326 		this_port[pias++] = p;
327 		printk(KERN_INFO "%s: Multiface III port using irq\n", p->name);
328 		/* XXX: set operating mode */
329 
330 		p->private_data = (void *)piabase;
331 		parport_announce_port (p);
332 
333 		if (pias >= MAX_MFC)
334 			break;
335 		continue;
336 
337 	out_irq:
338 		parport_put_port(p);
339 	out_port:
340 		release_mem_region(piabase, sizeof(struct pia));
341 	}
342 
343 	return pias ? 0 : -ENODEV;
344 }
345 
346 static void __exit parport_mfc3_exit(void)
347 {
348 	int i;
349 
350 	for (i = 0; i < MAX_MFC; i++) {
351 		if (!this_port[i])
352 			continue;
353 		parport_remove_port(this_port[i]);
354 		if (this_port[i]->irq != PARPORT_IRQ_NONE) {
355 			if (--use_cnt == 0)
356 				free_irq(IRQ_AMIGA_PORTS, &pp_mfc3_ops);
357 		}
358 		release_mem_region(ZTWO_PADDR(this_port[i]->private_data), sizeof(struct pia));
359 		parport_put_port(this_port[i]);
360 	}
361 }
362 
363 
364 MODULE_AUTHOR("Joerg Dorchain <joerg@dorchain.net>");
365 MODULE_DESCRIPTION("Parport Driver for Multiface 3 expansion cards Parallel Port");
366 MODULE_SUPPORTED_DEVICE("Multiface 3 Parallel Port");
367 MODULE_LICENSE("GPL");
368 
369 module_init(parport_mfc3_init)
370 module_exit(parport_mfc3_exit)
371