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09c434b8 | 1 | // SPDX-License-Identifier: GPL-2.0-only |
1da177e4 LT |
2 | /* Low-level parallel port routines for the Multiface 3 card |
3 | * | |
4 | * Author: Joerg Dorchain <joerg@dorchain.net> | |
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 | #ifdef DEBUG | |
74 | #define DPRINTK printk | |
75 | #else | |
76 | static inline int DPRINTK(void *nothing, ...) {return 0;} | |
77 | #endif | |
78 | ||
79 | static struct parport *this_port[MAX_MFC] = {NULL, }; | |
80 | static volatile int dummy; /* for trigger readds */ | |
81 | ||
82 | #define pia(dev) ((struct pia *)(dev->base)) | |
83 | static struct parport_operations pp_mfc3_ops; | |
84 | ||
85 | static void mfc3_write_data(struct parport *p, unsigned char data) | |
86 | { | |
87 | DPRINTK(KERN_DEBUG "write_data %c\n",data); | |
88 | ||
89 | dummy = pia(p)->pprb; /* clears irq bit */ | |
90 | /* Triggers also /STROBE.*/ | |
91 | pia(p)->pprb = data; | |
92 | } | |
93 | ||
94 | static unsigned char mfc3_read_data(struct parport *p) | |
95 | { | |
96 | /* clears interrupt bit. Triggers also /STROBE. */ | |
97 | return pia(p)->pprb; | |
98 | } | |
99 | ||
100 | static unsigned char control_pc_to_mfc3(unsigned char control) | |
101 | { | |
102 | unsigned char ret = 32|64; | |
103 | ||
104 | if (control & PARPORT_CONTROL_SELECT) /* XXX: What is SELECP? */ | |
105 | ret &= ~32; /* /SELECT_IN */ | |
106 | if (control & PARPORT_CONTROL_INIT) /* INITP */ | |
107 | ret |= 128; | |
108 | if (control & PARPORT_CONTROL_AUTOFD) /* AUTOLF */ | |
109 | ret &= ~64; | |
110 | if (control & PARPORT_CONTROL_STROBE) /* Strobe */ | |
111 | /* Handled directly by hardware */; | |
112 | return ret; | |
113 | } | |
114 | ||
115 | static unsigned char control_mfc3_to_pc(unsigned char control) | |
116 | { | |
117 | unsigned char ret = PARPORT_CONTROL_STROBE | |
118 | | PARPORT_CONTROL_AUTOFD | PARPORT_CONTROL_SELECT; | |
119 | ||
120 | if (control & 128) /* /INITP */ | |
121 | ret |= PARPORT_CONTROL_INIT; | |
122 | if (control & 64) /* /AUTOLF */ | |
123 | ret &= ~PARPORT_CONTROL_AUTOFD; | |
124 | if (control & 32) /* /SELECT_IN */ | |
125 | ret &= ~PARPORT_CONTROL_SELECT; | |
126 | return ret; | |
127 | } | |
128 | ||
129 | static void mfc3_write_control(struct parport *p, unsigned char control) | |
130 | { | |
131 | DPRINTK(KERN_DEBUG "write_control %02x\n",control); | |
132 | pia(p)->ppra = (pia(p)->ppra & 0x1f) | control_pc_to_mfc3(control); | |
133 | } | |
134 | ||
135 | static unsigned char mfc3_read_control( struct parport *p) | |
136 | { | |
137 | DPRINTK(KERN_DEBUG "read_control \n"); | |
138 | return control_mfc3_to_pc(pia(p)->ppra & 0xe0); | |
139 | } | |
140 | ||
141 | static unsigned char mfc3_frob_control( struct parport *p, unsigned char mask, unsigned char val) | |
142 | { | |
143 | unsigned char old; | |
144 | ||
145 | DPRINTK(KERN_DEBUG "frob_control mask %02x, value %02x\n",mask,val); | |
146 | old = mfc3_read_control(p); | |
147 | mfc3_write_control(p, (old & ~mask) ^ val); | |
148 | return old; | |
149 | } | |
150 | ||
1da177e4 LT |
151 | static unsigned char status_mfc3_to_pc(unsigned char status) |
152 | { | |
153 | unsigned char ret = PARPORT_STATUS_BUSY; | |
154 | ||
155 | if (status & 1) /* Busy */ | |
156 | ret &= ~PARPORT_STATUS_BUSY; | |
157 | if (status & 2) /* PaperOut */ | |
158 | ret |= PARPORT_STATUS_PAPEROUT; | |
159 | if (status & 4) /* Selected */ | |
160 | ret |= PARPORT_STATUS_SELECT; | |
161 | if (status & 8) /* Ack */ | |
162 | ret |= PARPORT_STATUS_ACK; | |
163 | if (status & 16) /* /ERROR */ | |
164 | ret |= PARPORT_STATUS_ERROR; | |
165 | ||
166 | return ret; | |
167 | } | |
168 | ||
1da177e4 LT |
169 | static unsigned char mfc3_read_status(struct parport *p) |
170 | { | |
171 | unsigned char status; | |
172 | ||
173 | status = status_mfc3_to_pc(pia(p)->ppra & 0x1f); | |
174 | DPRINTK(KERN_DEBUG "read_status %02x\n", status); | |
175 | return status; | |
176 | } | |
177 | ||
df4c756e | 178 | static int use_cnt; |
1da177e4 | 179 | |
7d12e780 | 180 | static irqreturn_t mfc3_interrupt(int irq, void *dev_id) |
1da177e4 LT |
181 | { |
182 | int i; | |
183 | ||
184 | for( i = 0; i < MAX_MFC; i++) | |
185 | if (this_port[i] != NULL) | |
186 | if (pia(this_port[i])->crb & 128) { /* Board caused interrupt */ | |
187 | dummy = pia(this_port[i])->pprb; /* clear irq bit */ | |
f230d101 | 188 | parport_generic_irq(this_port[i]); |
1da177e4 LT |
189 | } |
190 | return IRQ_HANDLED; | |
191 | } | |
192 | ||
193 | static void mfc3_enable_irq(struct parport *p) | |
194 | { | |
195 | pia(p)->crb |= PIA_C1_ENABLE_IRQ; | |
196 | } | |
197 | ||
198 | static void mfc3_disable_irq(struct parport *p) | |
199 | { | |
200 | pia(p)->crb &= ~PIA_C1_ENABLE_IRQ; | |
201 | } | |
202 | ||
203 | static void mfc3_data_forward(struct parport *p) | |
204 | { | |
205 | DPRINTK(KERN_DEBUG "forward\n"); | |
206 | pia(p)->crb &= ~PIA_DDR; /* make data direction register visible */ | |
207 | pia(p)->pddrb = 255; /* all pins output */ | |
208 | pia(p)->crb |= PIA_DDR; /* make data register visible - default */ | |
209 | } | |
210 | ||
211 | static void mfc3_data_reverse(struct parport *p) | |
212 | { | |
213 | DPRINTK(KERN_DEBUG "reverse\n"); | |
214 | pia(p)->crb &= ~PIA_DDR; /* make data direction register visible */ | |
215 | pia(p)->pddrb = 0; /* all pins input */ | |
216 | pia(p)->crb |= PIA_DDR; /* make data register visible - default */ | |
217 | } | |
218 | ||
219 | static void mfc3_init_state(struct pardevice *dev, struct parport_state *s) | |
220 | { | |
221 | s->u.amiga.data = 0; | |
222 | s->u.amiga.datadir = 255; | |
223 | s->u.amiga.status = 0; | |
224 | s->u.amiga.statusdir = 0xe0; | |
225 | } | |
226 | ||
227 | static void mfc3_save_state(struct parport *p, struct parport_state *s) | |
228 | { | |
229 | s->u.amiga.data = pia(p)->pprb; | |
230 | pia(p)->crb &= ~PIA_DDR; | |
231 | s->u.amiga.datadir = pia(p)->pddrb; | |
232 | pia(p)->crb |= PIA_DDR; | |
233 | s->u.amiga.status = pia(p)->ppra; | |
234 | pia(p)->cra &= ~PIA_DDR; | |
235 | s->u.amiga.statusdir = pia(p)->pddrb; | |
236 | pia(p)->cra |= PIA_DDR; | |
237 | } | |
238 | ||
239 | static void mfc3_restore_state(struct parport *p, struct parport_state *s) | |
240 | { | |
241 | pia(p)->pprb = s->u.amiga.data; | |
242 | pia(p)->crb &= ~PIA_DDR; | |
243 | pia(p)->pddrb = s->u.amiga.datadir; | |
244 | pia(p)->crb |= PIA_DDR; | |
245 | pia(p)->ppra = s->u.amiga.status; | |
246 | pia(p)->cra &= ~PIA_DDR; | |
247 | pia(p)->pddrb = s->u.amiga.statusdir; | |
248 | pia(p)->cra |= PIA_DDR; | |
249 | } | |
250 | ||
251 | static struct parport_operations pp_mfc3_ops = { | |
252 | .write_data = mfc3_write_data, | |
253 | .read_data = mfc3_read_data, | |
254 | ||
255 | .write_control = mfc3_write_control, | |
256 | .read_control = mfc3_read_control, | |
257 | .frob_control = mfc3_frob_control, | |
258 | ||
259 | .read_status = mfc3_read_status, | |
260 | ||
261 | .enable_irq = mfc3_enable_irq, | |
262 | .disable_irq = mfc3_disable_irq, | |
263 | ||
264 | .data_forward = mfc3_data_forward, | |
265 | .data_reverse = mfc3_data_reverse, | |
266 | ||
267 | .init_state = mfc3_init_state, | |
268 | .save_state = mfc3_save_state, | |
269 | .restore_state = mfc3_restore_state, | |
270 | ||
271 | .epp_write_data = parport_ieee1284_epp_write_data, | |
272 | .epp_read_data = parport_ieee1284_epp_read_data, | |
273 | .epp_write_addr = parport_ieee1284_epp_write_addr, | |
274 | .epp_read_addr = parport_ieee1284_epp_read_addr, | |
275 | ||
276 | .ecp_write_data = parport_ieee1284_ecp_write_data, | |
277 | .ecp_read_data = parport_ieee1284_ecp_read_data, | |
278 | .ecp_write_addr = parport_ieee1284_ecp_write_addr, | |
279 | ||
280 | .compat_write_data = parport_ieee1284_write_compat, | |
281 | .nibble_read_data = parport_ieee1284_read_nibble, | |
282 | .byte_read_data = parport_ieee1284_read_byte, | |
283 | ||
284 | .owner = THIS_MODULE, | |
285 | }; | |
286 | ||
287 | /* ----------- Initialisation code --------------------------------- */ | |
288 | ||
289 | static int __init parport_mfc3_init(void) | |
290 | { | |
291 | struct parport *p; | |
292 | int pias = 0; | |
293 | struct pia *pp; | |
294 | struct zorro_dev *z = NULL; | |
295 | ||
296 | if (!MACH_IS_AMIGA) | |
297 | return -ENODEV; | |
298 | ||
299 | while ((z = zorro_find_device(ZORRO_PROD_BSC_MULTIFACE_III, z))) { | |
300 | unsigned long piabase = z->resource.start+PIABASE; | |
301 | if (!request_mem_region(piabase, sizeof(struct pia), "PIA")) | |
302 | continue; | |
303 | ||
6112ea08 | 304 | pp = ZTWO_VADDR(piabase); |
1da177e4 LT |
305 | pp->crb = 0; |
306 | pp->pddrb = 255; /* all data pins output */ | |
307 | pp->crb = PIA_DDR|32|8; | |
308 | dummy = pp->pddrb; /* reading clears interrupt */ | |
309 | pp->cra = 0; | |
310 | pp->pddra = 0xe0; /* /RESET, /DIR ,/AUTO-FEED output */ | |
311 | pp->cra = PIA_DDR; | |
312 | pp->ppra = 0; /* reset printer */ | |
313 | udelay(10); | |
314 | pp->ppra = 128; | |
315 | p = parport_register_port((unsigned long)pp, IRQ_AMIGA_PORTS, | |
316 | PARPORT_DMA_NONE, &pp_mfc3_ops); | |
317 | if (!p) | |
318 | goto out_port; | |
319 | ||
320 | if (p->irq != PARPORT_IRQ_NONE) { | |
321 | if (use_cnt++ == 0) | |
dace1453 | 322 | if (request_irq(IRQ_AMIGA_PORTS, mfc3_interrupt, IRQF_SHARED, p->name, &pp_mfc3_ops)) |
1da177e4 LT |
323 | goto out_irq; |
324 | } | |
c15a3837 | 325 | p->dev = &z->dev; |
1da177e4 LT |
326 | |
327 | this_port[pias++] = p; | |
328 | printk(KERN_INFO "%s: Multiface III port using irq\n", p->name); | |
329 | /* XXX: set operating mode */ | |
330 | ||
331 | p->private_data = (void *)piabase; | |
332 | parport_announce_port (p); | |
333 | ||
334 | if (pias >= MAX_MFC) | |
335 | break; | |
336 | continue; | |
337 | ||
338 | out_irq: | |
339 | parport_put_port(p); | |
340 | out_port: | |
341 | release_mem_region(piabase, sizeof(struct pia)); | |
342 | } | |
343 | ||
344 | return pias ? 0 : -ENODEV; | |
345 | } | |
346 | ||
347 | static void __exit parport_mfc3_exit(void) | |
348 | { | |
349 | int i; | |
350 | ||
351 | for (i = 0; i < MAX_MFC; i++) { | |
352 | if (!this_port[i]) | |
353 | continue; | |
354 | parport_remove_port(this_port[i]); | |
49966bae | 355 | if (this_port[i]->irq != PARPORT_IRQ_NONE) { |
1da177e4 LT |
356 | if (--use_cnt == 0) |
357 | free_irq(IRQ_AMIGA_PORTS, &pp_mfc3_ops); | |
358 | } | |
359 | release_mem_region(ZTWO_PADDR(this_port[i]->private_data), sizeof(struct pia)); | |
360 | parport_put_port(this_port[i]); | |
361 | } | |
362 | } | |
363 | ||
364 | ||
365 | MODULE_AUTHOR("Joerg Dorchain <joerg@dorchain.net>"); | |
42b2aa86 | 366 | MODULE_DESCRIPTION("Parport Driver for Multiface 3 expansion cards Parallel Port"); |
1da177e4 LT |
367 | MODULE_SUPPORTED_DEVICE("Multiface 3 Parallel Port"); |
368 | MODULE_LICENSE("GPL"); | |
369 | ||
370 | module_init(parport_mfc3_init) | |
371 | module_exit(parport_mfc3_exit) |