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 <asm/setup.h>
63 #include <asm/amigahw.h>
64 #include <asm/irq.h>
65 #include <asm/amigaints.h>
66
67 /* Maximum Number of Cards supported */
68 #define MAX_MFC 5
69
70 #undef DEBUG
71 #ifdef DEBUG
72 #define DPRINTK printk
73 #else
74 static inline int DPRINTK(void *nothing, ...) {return 0;}
75 #endif
76
77 static struct parport *this_port[MAX_MFC] = {NULL, };
78 static volatile int dummy; /* for trigger readds */
79
80 #define pia(dev) ((struct pia *)(dev->base))
81 static struct parport_operations pp_mfc3_ops;
82
83 static void mfc3_write_data(struct parport *p, unsigned char data)
84 {
85 DPRINTK("write_data %c\n",data);
86
87 dummy = pia(p)->pprb; /* clears irq bit */
88 /* Triggers also /STROBE.*/
89 pia(p)->pprb = data;
90 }
91
92 static unsigned char mfc3_read_data(struct parport *p)
93 {
94 /* clears interupt bit. Triggers also /STROBE. */
95 return pia(p)->pprb;
96 }
97
98 static unsigned char control_pc_to_mfc3(unsigned char control)
99 {
100 unsigned char ret = 32|64;
101
102 if (control & PARPORT_CONTROL_SELECT) /* XXX: What is SELECP? */
103 ret &= ~32; /* /SELECT_IN */
104 if (control & PARPORT_CONTROL_INIT) /* INITP */
105 ret |= 128;
106 if (control & PARPORT_CONTROL_AUTOFD) /* AUTOLF */
107 ret &= ~64;
108 if (control & PARPORT_CONTROL_STROBE) /* Strobe */
109 /* Handled directly by hardware */;
110 return ret;
111 }
112
113 static unsigned char control_mfc3_to_pc(unsigned char control)
114 {
115 unsigned char ret = PARPORT_CONTROL_STROBE
116 | PARPORT_CONTROL_AUTOFD | PARPORT_CONTROL_SELECT;
117
118 if (control & 128) /* /INITP */
119 ret |= PARPORT_CONTROL_INIT;
120 if (control & 64) /* /AUTOLF */
121 ret &= ~PARPORT_CONTROL_AUTOFD;
122 if (control & 32) /* /SELECT_IN */
123 ret &= ~PARPORT_CONTROL_SELECT;
124 return ret;
125 }
126
127 static void mfc3_write_control(struct parport *p, unsigned char control)
128 {
129 DPRINTK("write_control %02x\n",control);
130 pia(p)->ppra = (pia(p)->ppra & 0x1f) | control_pc_to_mfc3(control);
131 }
132
133 static unsigned char mfc3_read_control( struct parport *p)
134 {
135 DPRINTK("read_control \n");
136 return control_mfc3_to_pc(pia(p)->ppra & 0xe0);
137 }
138
139 static unsigned char mfc3_frob_control( struct parport *p, unsigned char mask, unsigned char val)
140 {
141 unsigned char old;
142
143 DPRINTK("frob_control mask %02x, value %02x\n",mask,val);
144 old = mfc3_read_control(p);
145 mfc3_write_control(p, (old & ~mask) ^ val);
146 return old;
147 }
148
149 #if 0 /* currently unused */
150 static unsigned char status_pc_to_mfc3(unsigned char status)
151 {
152 unsigned char ret = 1;
153
154 if (status & PARPORT_STATUS_BUSY) /* Busy */
155 ret &= ~1;
156 if (status & PARPORT_STATUS_ACK) /* Ack */
157 ret |= 8;
158 if (status & PARPORT_STATUS_PAPEROUT) /* PaperOut */
159 ret |= 2;
160 if (status & PARPORT_STATUS_SELECT) /* select */
161 ret |= 4;
162 if (status & PARPORT_STATUS_ERROR) /* error */
163 ret |= 16;
164 return ret;
165 }
166 #endif
167
168 static unsigned char status_mfc3_to_pc(unsigned char status)
169 {
170 unsigned char ret = PARPORT_STATUS_BUSY;
171
172 if (status & 1) /* Busy */
173 ret &= ~PARPORT_STATUS_BUSY;
174 if (status & 2) /* PaperOut */
175 ret |= PARPORT_STATUS_PAPEROUT;
176 if (status & 4) /* Selected */
177 ret |= PARPORT_STATUS_SELECT;
178 if (status & 8) /* Ack */
179 ret |= PARPORT_STATUS_ACK;
180 if (status & 16) /* /ERROR */
181 ret |= PARPORT_STATUS_ERROR;
182
183 return ret;
184 }
185
186 #if 0 /* currently unused */
187 static void mfc3_write_status( struct parport *p, unsigned char status)
188 {
189 DPRINTK("write_status %02x\n",status);
190 pia(p)->ppra = (pia(p)->ppra & 0xe0) | status_pc_to_mfc3(status);
191 }
192 #endif
193
194 static unsigned char mfc3_read_status(struct parport *p)
195 {
196 unsigned char status;
197
198 status = status_mfc3_to_pc(pia(p)->ppra & 0x1f);
199 DPRINTK("read_status %02x\n", status);
200 return status;
201 }
202
203 #if 0 /* currently unused */
204 static void mfc3_change_mode( struct parport *p, int m)
205 {
206 /* XXX: This port only has one mode, and I am
207 not sure about the corresponding PC-style mode*/
208 }
209 #endif
210
211 static int use_cnt = 0;
212
213 static void mfc3_interrupt(int irq, void *dev_id, struct pt_regs *regs)
214 {
215 int i;
216
217 for( i = 0; i < MAX_MFC; i++)
218 if (this_port[i] != NULL)
219 if (pia(this_port[i])->crb & 128) { /* Board caused interrupt */
220 dummy = pia(this_port[i])->pprb; /* clear irq bit */
221 parport_generic_irq(irq, this_port[i], regs);
222 }
223 }
224
225 static void mfc3_enable_irq(struct parport *p)
226 {
227 pia(p)->crb |= PIA_C1_ENABLE_IRQ;
228 }
229
230 static void mfc3_disable_irq(struct parport *p)
231 {
232 pia(p)->crb &= ~PIA_C1_ENABLE_IRQ;
233 }
234
235 static void mfc3_data_forward(struct parport *p)
236 {
237 DPRINTK("forward\n");
238 pia(p)->crb &= ~PIA_DDR; /* make data direction register visible */
239 pia(p)->pddrb = 255; /* all pins output */
240 pia(p)->crb |= PIA_DDR; /* make data register visible - default */
241 }
242
243 static void mfc3_data_reverse(struct parport *p)
244 {
245 DPRINTK("reverse\n");
246 pia(p)->crb &= ~PIA_DDR; /* make data direction register visible */
247 pia(p)->pddrb = 0; /* all pins input */
248 pia(p)->crb |= PIA_DDR; /* make data register visible - default */
249 }
250
251 static void mfc3_init_state(struct pardevice *dev, struct parport_state *s)
252 {
253 s->u.amiga.data = 0;
254 s->u.amiga.datadir = 255;
255 s->u.amiga.status = 0;
256 s->u.amiga.statusdir = 0xe0;
257 }
258
259 static void mfc3_save_state(struct parport *p, struct parport_state *s)
260 {
261 s->u.amiga.data = pia(p)->pprb;
262 pia(p)->crb &= ~PIA_DDR;
263 s->u.amiga.datadir = pia(p)->pddrb;
264 pia(p)->crb |= PIA_DDR;
265 s->u.amiga.status = pia(p)->ppra;
266 pia(p)->cra &= ~PIA_DDR;
267 s->u.amiga.statusdir = pia(p)->pddrb;
268 pia(p)->cra |= PIA_DDR;
269 }
270
271 static void mfc3_restore_state(struct parport *p, struct parport_state *s)
272 {
273 pia(p)->pprb = s->u.amiga.data;
274 pia(p)->crb &= ~PIA_DDR;
275 pia(p)->pddrb = s->u.amiga.datadir;
276 pia(p)->crb |= PIA_DDR;
277 pia(p)->ppra = s->u.amiga.status;
278 pia(p)->cra &= ~PIA_DDR;
279 pia(p)->pddrb = s->u.amiga.statusdir;
280 pia(p)->cra |= PIA_DDR;
281 }
282
283 static void mfc3_inc_use_count(void)
284 {
285 MOD_INC_USE_COUNT;
286 }
287
288 static void mfc3_dec_use_count(void)
289 {
290 MOD_DEC_USE_COUNT;
291 }
292
293 static struct parport_operations pp_mfc3_ops = {
294 mfc3_write_data,
295 mfc3_read_data,
296
297 mfc3_write_control,
298 mfc3_read_control,
299 mfc3_frob_control,
300
301 mfc3_read_status,
302
303 mfc3_enable_irq,
304 mfc3_disable_irq,
305
306 mfc3_data_forward,
307 mfc3_data_reverse,
308
309 mfc3_init_state,
310 mfc3_save_state,
311 mfc3_restore_state,
312
313 mfc3_inc_use_count,
314 mfc3_dec_use_count,
315
316 parport_ieee1284_epp_write_data,
317 parport_ieee1284_epp_read_data,
318 parport_ieee1284_epp_write_addr,
319 parport_ieee1284_epp_read_addr,
320
321 parport_ieee1284_ecp_write_data,
322 parport_ieee1284_ecp_read_data,
323 parport_ieee1284_ecp_write_addr,
324
325 parport_ieee1284_write_compat,
326 parport_ieee1284_read_nibble,
327 parport_ieee1284_read_byte,
328 };
329
330 /* ----------- Initialisation code --------------------------------- */
331
332 int __init parport_mfc3_init(void)
333 {
334 struct parport *p;
335 int pias;
336 struct pia *pp;
337 struct zorro_dev *z = NULL;
338
339 if (!MACH_IS_AMIGA)
340 return -ENODEV;
341
342 while ((z = zorro_find_device(ZORRO_PROD_BSC_MULTIFACE_III, z))) {
343 unsigned long piabase = z->resource.start+PIABASE;
344 if (!request_mem_region(piabase, sizeof(struct pia), "PIA"))
345 continue;
346
347 pp = (struct pia *)ZTWO_VADDR(piabase);
348 pp->crb = 0;
349 pp->pddrb = 255; /* all data pins output */
350 pp->crb = PIA_DDR|32|8;
351 dummy = pp->pddrb; /* reading clears interrupt */
352 pp->cra = 0;
353 pp->pddra = 0xe0; /* /RESET, /DIR ,/AUTO-FEED output */
354 pp->cra = PIA_DDR;
355 pp->ppra = 0; /* reset printer */
356 udelay(10);
357 pp->ppra = 128;
358 p = parport_register_port((unsigned long)pp, IRQ_AMIGA_PORTS,
359 PARPORT_DMA_NONE, &pp_mfc3_ops);
360 if (!p)
361 goto out_port;
362
363 if (p->irq != PARPORT_IRQ_NONE) {
364 if (use_cnt++ == 0)
365 if (request_irq(IRQ_AMIGA_PORTS, mfc3_interrupt, SA_SHIRQ, p->name, &pp_mfc3_ops))
366 goto out_irq;
367 }
368
369 this_port[pias++] = p;
370 printk(KERN_INFO "%s: Multiface III port using irq\n", p->name);
371 /* XXX: set operating mode */
372 parport_proc_register(p);
373
374 p->private_data = (void *)piabase;
375 parport_announce_port (p);
376
377 if (pias >= MAX_MFC)
378 break;
379 continue;
380
381 out_irq:
382 parport_unregister_port(p);
383 out_port:
384 release_mem_region(piabase, sizeof(struct pia));
385 }
386
387 return pias ? 0 : -ENODEV;
388 }
389
390 void __exit parport_mfc3_exit(void)
391 {
392 int i;
393
394 for (i = 0; i < MAX_MFC; i++) {
395 if (!this_port[i])
396 continue;
397 if (!this_port[i]->irq != PARPORT_IRQ_NONE) {
398 if (--use_cnt == 0)
399 free_irq(IRQ_AMIGA_PORTS, &pp_mfc3_ops);
400 }
401 parport_proc_unregister(this_port[i]);
402 parport_unregister_port(this_port[i]);
403 release_mem_region(ZTWO_PADDR(this_port[i]->private_data), sizeof(struct pia));
404 }
405 }
406
407
408 MODULE_AUTHOR("Joerg Dorchain <joerg@dorchain.net>");
409 MODULE_DESCRIPTION("Parport Driver for Multiface 3 expansion cards Paralllel Port");
410 MODULE_SUPPORTED_DEVICE("Multiface 3 Parallel Port");
411
412 module_init(parport_mfc3_init)
413 module_exit(parport_mfc3_exit)
414
415
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