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 #if 0 /* currently unused */
151 static unsigned char status_pc_to_mfc3(unsigned char status)
152 {
153 unsigned char ret = 1;
154
155 if (status & PARPORT_STATUS_BUSY) /* Busy */
156 ret &= ~1;
157 if (status & PARPORT_STATUS_ACK) /* Ack */
158 ret |= 8;
159 if (status & PARPORT_STATUS_PAPEROUT) /* PaperOut */
160 ret |= 2;
161 if (status & PARPORT_STATUS_SELECT) /* select */
162 ret |= 4;
163 if (status & PARPORT_STATUS_ERROR) /* error */
164 ret |= 16;
165 return ret;
166 }
167 #endif
168
169 static unsigned char status_mfc3_to_pc(unsigned char status)
170 {
171 unsigned char ret = PARPORT_STATUS_BUSY;
172
173 if (status & 1) /* Busy */
174 ret &= ~PARPORT_STATUS_BUSY;
175 if (status & 2) /* PaperOut */
176 ret |= PARPORT_STATUS_PAPEROUT;
177 if (status & 4) /* Selected */
178 ret |= PARPORT_STATUS_SELECT;
179 if (status & 8) /* Ack */
180 ret |= PARPORT_STATUS_ACK;
181 if (status & 16) /* /ERROR */
182 ret |= PARPORT_STATUS_ERROR;
183
184 return ret;
185 }
186
187 #if 0 /* currently unused */
188 static void mfc3_write_status( struct parport *p, unsigned char status)
189 {
190 DPRINTK(KERN_DEBUG "write_status %02x\n",status);
191 pia(p)->ppra = (pia(p)->ppra & 0xe0) | status_pc_to_mfc3(status);
192 }
193 #endif
194
195 static unsigned char mfc3_read_status(struct parport *p)
196 {
197 unsigned char status;
198
199 status = status_mfc3_to_pc(pia(p)->ppra & 0x1f);
200 DPRINTK(KERN_DEBUG "read_status %02x\n", status);
201 return status;
202 }
203
204 #if 0 /* currently unused */
205 static void mfc3_change_mode( struct parport *p, int m)
206 {
207 /* XXX: This port only has one mode, and I am
208 not sure about the corresponding PC-style mode*/
209 }
210 #endif
211
212 static int use_cnt = 0;
213
214 static irqreturn_t mfc3_interrupt(int irq, void *dev_id)
215 {
216 int i;
217
218 for( i = 0; i < MAX_MFC; i++)
219 if (this_port[i] != NULL)
220 if (pia(this_port[i])->crb & 128) { /* Board caused interrupt */
221 dummy = pia(this_port[i])->pprb; /* clear irq bit */
222 parport_generic_irq(this_port[i]);
223 }
224 return IRQ_HANDLED;
225 }
226
227 static void mfc3_enable_irq(struct parport *p)
228 {
229 pia(p)->crb |= PIA_C1_ENABLE_IRQ;
230 }
231
232 static void mfc3_disable_irq(struct parport *p)
233 {
234 pia(p)->crb &= ~PIA_C1_ENABLE_IRQ;
235 }
236
237 static void mfc3_data_forward(struct parport *p)
238 {
239 DPRINTK(KERN_DEBUG "forward\n");
240 pia(p)->crb &= ~PIA_DDR; /* make data direction register visible */
241 pia(p)->pddrb = 255; /* all pins output */
242 pia(p)->crb |= PIA_DDR; /* make data register visible - default */
243 }
244
245 static void mfc3_data_reverse(struct parport *p)
246 {
247 DPRINTK(KERN_DEBUG "reverse\n");
248 pia(p)->crb &= ~PIA_DDR; /* make data direction register visible */
249 pia(p)->pddrb = 0; /* all pins input */
250 pia(p)->crb |= PIA_DDR; /* make data register visible - default */
251 }
252
253 static void mfc3_init_state(struct pardevice *dev, struct parport_state *s)
254 {
255 s->u.amiga.data = 0;
256 s->u.amiga.datadir = 255;
257 s->u.amiga.status = 0;
258 s->u.amiga.statusdir = 0xe0;
259 }
260
261 static void mfc3_save_state(struct parport *p, struct parport_state *s)
262 {
263 s->u.amiga.data = pia(p)->pprb;
264 pia(p)->crb &= ~PIA_DDR;
265 s->u.amiga.datadir = pia(p)->pddrb;
266 pia(p)->crb |= PIA_DDR;
267 s->u.amiga.status = pia(p)->ppra;
268 pia(p)->cra &= ~PIA_DDR;
269 s->u.amiga.statusdir = pia(p)->pddrb;
270 pia(p)->cra |= PIA_DDR;
271 }
272
273 static void mfc3_restore_state(struct parport *p, struct parport_state *s)
274 {
275 pia(p)->pprb = s->u.amiga.data;
276 pia(p)->crb &= ~PIA_DDR;
277 pia(p)->pddrb = s->u.amiga.datadir;
278 pia(p)->crb |= PIA_DDR;
279 pia(p)->ppra = s->u.amiga.status;
280 pia(p)->cra &= ~PIA_DDR;
281 pia(p)->pddrb = s->u.amiga.statusdir;
282 pia(p)->cra |= PIA_DDR;
283 }
284
285 static struct parport_operations pp_mfc3_ops = {
286 .write_data = mfc3_write_data,
287 .read_data = mfc3_read_data,
288
289 .write_control = mfc3_write_control,
290 .read_control = mfc3_read_control,
291 .frob_control = mfc3_frob_control,
292
293 .read_status = mfc3_read_status,
294
295 .enable_irq = mfc3_enable_irq,
296 .disable_irq = mfc3_disable_irq,
297
298 .data_forward = mfc3_data_forward,
299 .data_reverse = mfc3_data_reverse,
300
301 .init_state = mfc3_init_state,
302 .save_state = mfc3_save_state,
303 .restore_state = mfc3_restore_state,
304
305 .epp_write_data = parport_ieee1284_epp_write_data,
306 .epp_read_data = parport_ieee1284_epp_read_data,
307 .epp_write_addr = parport_ieee1284_epp_write_addr,
308 .epp_read_addr = parport_ieee1284_epp_read_addr,
309
310 .ecp_write_data = parport_ieee1284_ecp_write_data,
311 .ecp_read_data = parport_ieee1284_ecp_read_data,
312 .ecp_write_addr = parport_ieee1284_ecp_write_addr,
313
314 .compat_write_data = parport_ieee1284_write_compat,
315 .nibble_read_data = parport_ieee1284_read_nibble,
316 .byte_read_data = parport_ieee1284_read_byte,
317
318 .owner = THIS_MODULE,
319 };
320
321 /* ----------- Initialisation code --------------------------------- */
322
323 static int __init parport_mfc3_init(void)
324 {
325 struct parport *p;
326 int pias = 0;
327 struct pia *pp;
328 struct zorro_dev *z = NULL;
329
330 if (!MACH_IS_AMIGA)
331 return -ENODEV;
332
333 while ((z = zorro_find_device(ZORRO_PROD_BSC_MULTIFACE_III, z))) {
334 unsigned long piabase = z->resource.start+PIABASE;
335 if (!request_mem_region(piabase, sizeof(struct pia), "PIA"))
336 continue;
337
338 pp = (struct pia *)ZTWO_VADDR(piabase);
339 pp->crb = 0;
340 pp->pddrb = 255; /* all data pins output */
341 pp->crb = PIA_DDR|32|8;
342 dummy = pp->pddrb; /* reading clears interrupt */
343 pp->cra = 0;
344 pp->pddra = 0xe0; /* /RESET, /DIR ,/AUTO-FEED output */
345 pp->cra = PIA_DDR;
346 pp->ppra = 0; /* reset printer */
347 udelay(10);
348 pp->ppra = 128;
349 p = parport_register_port((unsigned long)pp, IRQ_AMIGA_PORTS,
350 PARPORT_DMA_NONE, &pp_mfc3_ops);
351 if (!p)
352 goto out_port;
353
354 if (p->irq != PARPORT_IRQ_NONE) {
355 if (use_cnt++ == 0)
356 if (request_irq(IRQ_AMIGA_PORTS, mfc3_interrupt, IRQF_SHARED, p->name, &pp_mfc3_ops))
357 goto out_irq;
358 }
359 p->dev = &z->dev;
360
361 this_port[pias++] = p;
362 printk(KERN_INFO "%s: Multiface III port using irq\n", p->name);
363 /* XXX: set operating mode */
364
365 p->private_data = (void *)piabase;
366 parport_announce_port (p);
367
368 if (pias >= MAX_MFC)
369 break;
370 continue;
371
372 out_irq:
373 parport_put_port(p);
374 out_port:
375 release_mem_region(piabase, sizeof(struct pia));
376 }
377
378 return pias ? 0 : -ENODEV;
379 }
380
381 static void __exit parport_mfc3_exit(void)
382 {
383 int i;
384
385 for (i = 0; i < MAX_MFC; i++) {
386 if (!this_port[i])
387 continue;
388 parport_remove_port(this_port[i]);
389 if (!this_port[i]->irq != PARPORT_IRQ_NONE) {
390 if (--use_cnt == 0)
391 free_irq(IRQ_AMIGA_PORTS, &pp_mfc3_ops);
392 }
393 release_mem_region(ZTWO_PADDR(this_port[i]->private_data), sizeof(struct pia));
394 parport_put_port(this_port[i]);
395 }
396 }
397
398
399 MODULE_AUTHOR("Joerg Dorchain <joerg@dorchain.net>");
400 MODULE_DESCRIPTION("Parport Driver for Multiface 3 expansion cards Paralllel Port");
401 MODULE_SUPPORTED_DEVICE("Multiface 3 Parallel Port");
402 MODULE_LICENSE("GPL");
403
404 module_init(parport_mfc3_init)
405 module_exit(parport_mfc3_exit)
406
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