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1 // SPDX-License-Identifier: GPL-2.0-only
2 /* Low-level parallel port routines for the Multiface 3 card
3  *
4  * Author: Joerg Dorchain <[email protected]>
5  *
6  * (C) The elitist m68k Users(TM)
7  *
8  * based on the existing parport_amiga and lp_mfc
9  *
10  *
11  * From the MFC3 documentation:
12  * 
13  * Miscellaneous PIA Details
14  * -------------------------
15  * 
16  *      The two open-drain interrupt outputs /IRQA and /IRQB are routed to
17  * /INT2 of the Z2 bus.
18  * 
19  *      The CPU data bus of the PIA (D0-D7) is connected to D8-D15 on the Z2
20  * bus. This means that any PIA registers are accessed at even addresses.
21  * 
22  * Centronics Pin Connections for the PIA
23  * --------------------------------------
24  * 
25  *      The following table shows the connections between the PIA and the
26  * Centronics interface connector. These connections implement a single, but
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
29  * "Parallel Connectors".
30  * 
31  * 
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  * -------+-----+-----+---------------------------------------------------------
48  * 
49  * Should be enough to understand some of the driver.
50  *
51  * Per convention for normal use the port registers are visible.
52  * If you need the data direction registers, restore the value in the
53  * control register.
54  */
55
56 #include "multiface.h"
57 #include <linux/module.h>
58 #include <linux/init.h>
59 #include <linux/parport.h>
60 #include <linux/delay.h>
61 #include <linux/mc6821.h>
62 #include <linux/zorro.h>
63 #include <linux/interrupt.h>
64 #include <asm/setup.h>
65 #include <asm/amigahw.h>
66 #include <asm/irq.h>
67 #include <asm/amigaints.h>
68
69 /* Maximum Number of Cards supported */
70 #define MAX_MFC 5
71
72 #undef DEBUG
73
74 static struct parport *this_port[MAX_MFC] = {NULL, };
75 static volatile int dummy; /* for trigger readds */
76
77 #define pia(dev) ((struct pia *)(dev->base))
78 static struct parport_operations pp_mfc3_ops;
79
80 static void mfc3_write_data(struct parport *p, unsigned char data)
81 {
82         pr_debug("write_data %c\n", data);
83
84         dummy = pia(p)->pprb; /* clears irq bit */
85         /* Triggers also /STROBE.*/
86         pia(p)->pprb = data;
87 }
88
89 static unsigned char mfc3_read_data(struct parport *p)
90 {
91         /* clears interrupt bit. Triggers also /STROBE. */
92         return pia(p)->pprb;
93 }
94
95 static unsigned char control_pc_to_mfc3(unsigned char control)
96 {
97         unsigned char ret = 32|64;
98
99         if (control & PARPORT_CONTROL_SELECT) /* XXX: What is SELECP? */
100                 ret &= ~32; /* /SELECT_IN */
101         if (control & PARPORT_CONTROL_INIT) /* INITP */
102                 ret |= 128;
103         if (control & PARPORT_CONTROL_AUTOFD) /* AUTOLF */
104                 ret &= ~64;
105         /* PARPORT_CONTROL_STROBE handled directly by hardware */
106         return ret;
107 }
108
109 static unsigned char control_mfc3_to_pc(unsigned char control)
110 {
111         unsigned char ret = PARPORT_CONTROL_STROBE 
112                           | PARPORT_CONTROL_AUTOFD | PARPORT_CONTROL_SELECT;
113
114         if (control & 128) /* /INITP */
115                 ret |= PARPORT_CONTROL_INIT;
116         if (control & 64) /* /AUTOLF */
117                 ret &= ~PARPORT_CONTROL_AUTOFD;
118         if (control & 32) /* /SELECT_IN */
119                 ret &= ~PARPORT_CONTROL_SELECT;
120         return ret;
121 }
122
123 static void mfc3_write_control(struct parport *p, unsigned char control)
124 {
125         pr_debug("write_control %02x\n", control);
126         pia(p)->ppra = (pia(p)->ppra & 0x1f) | control_pc_to_mfc3(control);
127 }
128         
129 static unsigned char mfc3_read_control( struct parport *p)
130 {
131         pr_debug("read_control\n");
132         return control_mfc3_to_pc(pia(p)->ppra & 0xe0);
133 }
134
135 static unsigned char mfc3_frob_control( struct parport *p, unsigned char mask, unsigned char val)
136 {
137         unsigned char old;
138
139         pr_debug("frob_control mask %02x, value %02x\n", mask, val);
140         old = mfc3_read_control(p);
141         mfc3_write_control(p, (old & ~mask) ^ val);
142         return old;
143 }
144
145 static unsigned char status_mfc3_to_pc(unsigned char status)
146 {
147         unsigned char ret = PARPORT_STATUS_BUSY;
148
149         if (status & 1) /* Busy */
150                 ret &= ~PARPORT_STATUS_BUSY;
151         if (status & 2) /* PaperOut */
152                 ret |= PARPORT_STATUS_PAPEROUT;
153         if (status & 4) /* Selected */
154                 ret |= PARPORT_STATUS_SELECT;
155         if (status & 8) /* Ack */
156                 ret |= PARPORT_STATUS_ACK;
157         if (status & 16) /* /ERROR */
158                 ret |= PARPORT_STATUS_ERROR;
159
160         return ret;
161 }
162
163 static unsigned char mfc3_read_status(struct parport *p)
164 {
165         unsigned char status;
166
167         status = status_mfc3_to_pc(pia(p)->ppra & 0x1f);
168         pr_debug("read_status %02x\n", status);
169         return status;
170 }
171
172 static int use_cnt;
173
174 static irqreturn_t mfc3_interrupt(int irq, void *dev_id)
175 {
176         int i;
177
178         for( i = 0; i < MAX_MFC; i++)
179                 if (this_port[i] != NULL)
180                         if (pia(this_port[i])->crb & 128) { /* Board caused interrupt */
181                                 dummy = pia(this_port[i])->pprb; /* clear irq bit */
182                                 parport_generic_irq(this_port[i]);
183                         }
184         return IRQ_HANDLED;
185 }
186
187 static void mfc3_enable_irq(struct parport *p)
188 {
189         pia(p)->crb |= PIA_C1_ENABLE_IRQ;
190 }
191
192 static void mfc3_disable_irq(struct parport *p)
193 {
194         pia(p)->crb &= ~PIA_C1_ENABLE_IRQ;
195 }
196
197 static void mfc3_data_forward(struct parport *p)
198 {
199         pr_debug("forward\n");
200         pia(p)->crb &= ~PIA_DDR; /* make data direction register visible */
201         pia(p)->pddrb = 255; /* all pins output */
202         pia(p)->crb |= PIA_DDR; /* make data register visible - default */
203 }
204
205 static void mfc3_data_reverse(struct parport *p)
206 {
207         pr_debug("reverse\n");
208         pia(p)->crb &= ~PIA_DDR; /* make data direction register visible */
209         pia(p)->pddrb = 0; /* all pins input */
210         pia(p)->crb |= PIA_DDR; /* make data register visible - default */
211 }
212
213 static void mfc3_init_state(struct pardevice *dev, struct parport_state *s)
214 {
215         s->u.amiga.data = 0;
216         s->u.amiga.datadir = 255;
217         s->u.amiga.status = 0;
218         s->u.amiga.statusdir = 0xe0;
219 }
220
221 static void mfc3_save_state(struct parport *p, struct parport_state *s)
222 {
223         s->u.amiga.data = pia(p)->pprb;
224         pia(p)->crb &= ~PIA_DDR;
225         s->u.amiga.datadir = pia(p)->pddrb;
226         pia(p)->crb |= PIA_DDR;
227         s->u.amiga.status = pia(p)->ppra;
228         pia(p)->cra &= ~PIA_DDR;
229         s->u.amiga.statusdir = pia(p)->pddrb;
230         pia(p)->cra |= PIA_DDR;
231 }
232
233 static void mfc3_restore_state(struct parport *p, struct parport_state *s)
234 {
235         pia(p)->pprb = s->u.amiga.data;
236         pia(p)->crb &= ~PIA_DDR;
237         pia(p)->pddrb = s->u.amiga.datadir;
238         pia(p)->crb |= PIA_DDR;
239         pia(p)->ppra = s->u.amiga.status;
240         pia(p)->cra &= ~PIA_DDR;
241         pia(p)->pddrb = s->u.amiga.statusdir;
242         pia(p)->cra |= PIA_DDR;
243 }
244
245 static struct parport_operations pp_mfc3_ops = {
246         .write_data     = mfc3_write_data,
247         .read_data      = mfc3_read_data,
248
249         .write_control  = mfc3_write_control,
250         .read_control   = mfc3_read_control,
251         .frob_control   = mfc3_frob_control,
252
253         .read_status    = mfc3_read_status,
254
255         .enable_irq     = mfc3_enable_irq,
256         .disable_irq    = mfc3_disable_irq,
257
258         .data_forward   = mfc3_data_forward, 
259         .data_reverse   = mfc3_data_reverse, 
260
261         .init_state     = mfc3_init_state,
262         .save_state     = mfc3_save_state,
263         .restore_state  = mfc3_restore_state,
264
265         .epp_write_data = parport_ieee1284_epp_write_data,
266         .epp_read_data  = parport_ieee1284_epp_read_data,
267         .epp_write_addr = parport_ieee1284_epp_write_addr,
268         .epp_read_addr  = parport_ieee1284_epp_read_addr,
269
270         .ecp_write_data = parport_ieee1284_ecp_write_data,
271         .ecp_read_data  = parport_ieee1284_ecp_read_data,
272         .ecp_write_addr = parport_ieee1284_ecp_write_addr,
273
274         .compat_write_data      = parport_ieee1284_write_compat,
275         .nibble_read_data       = parport_ieee1284_read_nibble,
276         .byte_read_data         = parport_ieee1284_read_byte,
277
278         .owner          = THIS_MODULE,
279 };
280
281 /* ----------- Initialisation code --------------------------------- */
282
283 static int __init parport_mfc3_init(void)
284 {
285         struct parport *p;
286         int pias = 0;
287         struct pia *pp;
288         struct zorro_dev *z = NULL;
289
290         if (!MACH_IS_AMIGA)
291                 return -ENODEV;
292
293         while ((z = zorro_find_device(ZORRO_PROD_BSC_MULTIFACE_III, z))) {
294                 unsigned long piabase = z->resource.start+PIABASE;
295                 if (!request_mem_region(piabase, sizeof(struct pia), "PIA"))
296                         continue;
297
298                 pp = ZTWO_VADDR(piabase);
299                 pp->crb = 0;
300                 pp->pddrb = 255; /* all data pins output */
301                 pp->crb = PIA_DDR|32|8;
302                 dummy = pp->pddrb; /* reading clears interrupt */
303                 pp->cra = 0;
304                 pp->pddra = 0xe0; /* /RESET,  /DIR ,/AUTO-FEED output */
305                 pp->cra = PIA_DDR;
306                 pp->ppra = 0; /* reset printer */
307                 udelay(10);
308                 pp->ppra = 128;
309                 p = parport_register_port((unsigned long)pp, IRQ_AMIGA_PORTS,
310                                           PARPORT_DMA_NONE, &pp_mfc3_ops);
311                 if (!p)
312                         goto out_port;
313
314                 if (p->irq != PARPORT_IRQ_NONE) {
315                         if (use_cnt++ == 0)
316                                 if (request_irq(IRQ_AMIGA_PORTS, mfc3_interrupt, IRQF_SHARED, p->name, &pp_mfc3_ops))
317                                         goto out_irq;
318                 }
319                 p->dev = &z->dev;
320
321                 this_port[pias++] = p;
322                 pr_info("%s: Multiface III port using irq\n", p->name);
323                 /* XXX: set operating mode */
324
325                 p->private_data = (void *)piabase;
326                 parport_announce_port (p);
327
328                 if (pias >= MAX_MFC)
329                         break;
330                 continue;
331
332         out_irq:
333                 parport_put_port(p);
334         out_port:
335                 release_mem_region(piabase, sizeof(struct pia));
336         }
337
338         return pias ? 0 : -ENODEV;
339 }
340
341 static void __exit parport_mfc3_exit(void)
342 {
343         int i;
344
345         for (i = 0; i < MAX_MFC; i++) {
346                 if (!this_port[i])
347                         continue;
348                 parport_remove_port(this_port[i]);
349                 if (this_port[i]->irq != PARPORT_IRQ_NONE) {
350                         if (--use_cnt == 0) 
351                                 free_irq(IRQ_AMIGA_PORTS, &pp_mfc3_ops);
352                 }
353                 release_mem_region(ZTWO_PADDR(this_port[i]->private_data), sizeof(struct pia));
354                 parport_put_port(this_port[i]);
355         }
356 }
357
358
359 MODULE_AUTHOR("Joerg Dorchain <[email protected]>");
360 MODULE_DESCRIPTION("Parport Driver for Multiface 3 expansion cards Parallel Port");
361 MODULE_LICENSE("GPL");
362
363 module_init(parport_mfc3_init)
364 module_exit(parport_mfc3_exit)
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