1 /* Low-level parallel port routines for the Multiface 3 card
3 * Author: Joerg Dorchain <joerg@dorchain.net>
5 * (C) The elitist m68k Users(TM)
7 * based on the existing parport_amiga and lp_mfc
10 * From the MFC3 documentation:
12 * Miscellaneous PIA Details
13 * -------------------------
15 * The two open-drain interrupt outputs /IRQA and /IRQB are routed to
16 * /INT2 of the Z2 bus.
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.
21 * Centronics Pin Connections for the PIA
22 * --------------------------------------
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".
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 * -------+-----+-----+---------------------------------------------------------
48 * Should be enough to understand some of the driver.
50 * Per convention for normal use the port registers are visible.
51 * If you need the data direction registers, restore the value in the
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>
66 #include <asm/amigaints.h>
68 /* Maximum Number of Cards supported */
73 #define DPRINTK printk
75 static inline int DPRINTK(void *nothing, ...) {return 0;}
78 static struct parport *this_port[MAX_MFC] = {NULL, };
79 static volatile int dummy; /* for trigger readds */
81 #define pia(dev) ((struct pia *)(dev->base))
82 static struct parport_operations pp_mfc3_ops;
84 static void mfc3_write_data(struct parport *p, unsigned char data)
86 DPRINTK(KERN_DEBUG "write_data %c\n",data);
88 dummy = pia(p)->pprb; /* clears irq bit */
89 /* Triggers also /STROBE.*/
93 static unsigned char mfc3_read_data(struct parport *p)
95 /* clears interrupt bit. Triggers also /STROBE. */
99 static unsigned char control_pc_to_mfc3(unsigned char control)
101 unsigned char ret = 32|64;
103 if (control & PARPORT_CONTROL_SELECT) /* XXX: What is SELECP? */
104 ret &= ~32; /* /SELECT_IN */
105 if (control & PARPORT_CONTROL_INIT) /* INITP */
107 if (control & PARPORT_CONTROL_AUTOFD) /* AUTOLF */
109 if (control & PARPORT_CONTROL_STROBE) /* Strobe */
110 /* Handled directly by hardware */;
114 static unsigned char control_mfc3_to_pc(unsigned char control)
116 unsigned char ret = PARPORT_CONTROL_STROBE
117 | PARPORT_CONTROL_AUTOFD | PARPORT_CONTROL_SELECT;
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;
128 static void mfc3_write_control(struct parport *p, unsigned char control)
130 DPRINTK(KERN_DEBUG "write_control %02x\n",control);
131 pia(p)->ppra = (pia(p)->ppra & 0x1f) | control_pc_to_mfc3(control);
134 static unsigned char mfc3_read_control( struct parport *p)
136 DPRINTK(KERN_DEBUG "read_control \n");
137 return control_mfc3_to_pc(pia(p)->ppra & 0xe0);
140 static unsigned char mfc3_frob_control( struct parport *p, unsigned char mask, unsigned char val)
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);
150 #if 0 /* currently unused */
151 static unsigned char status_pc_to_mfc3(unsigned char status)
153 unsigned char ret = 1;
155 if (status & PARPORT_STATUS_BUSY) /* Busy */
157 if (status & PARPORT_STATUS_ACK) /* Ack */
159 if (status & PARPORT_STATUS_PAPEROUT) /* PaperOut */
161 if (status & PARPORT_STATUS_SELECT) /* select */
163 if (status & PARPORT_STATUS_ERROR) /* error */
169 static unsigned char status_mfc3_to_pc(unsigned char status)
171 unsigned char ret = PARPORT_STATUS_BUSY;
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;
187 #if 0 /* currently unused */
188 static void mfc3_write_status( struct parport *p, unsigned char status)
190 DPRINTK(KERN_DEBUG "write_status %02x\n",status);
191 pia(p)->ppra = (pia(p)->ppra & 0xe0) | status_pc_to_mfc3(status);
195 static unsigned char mfc3_read_status(struct parport *p)
197 unsigned char status;
199 status = status_mfc3_to_pc(pia(p)->ppra & 0x1f);
200 DPRINTK(KERN_DEBUG "read_status %02x\n", status);
204 #if 0 /* currently unused */
205 static void mfc3_change_mode( struct parport *p, int m)
207 /* XXX: This port only has one mode, and I am
208 not sure about the corresponding PC-style mode*/
212 static int use_cnt = 0;
214 static irqreturn_t mfc3_interrupt(int irq, void *dev_id, struct pt_regs *regs)
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(irq, this_port[i], regs);
227 static void mfc3_enable_irq(struct parport *p)
229 pia(p)->crb |= PIA_C1_ENABLE_IRQ;
232 static void mfc3_disable_irq(struct parport *p)
234 pia(p)->crb &= ~PIA_C1_ENABLE_IRQ;
237 static void mfc3_data_forward(struct parport *p)
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 */
245 static void mfc3_data_reverse(struct parport *p)
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 */
253 static void mfc3_init_state(struct pardevice *dev, struct parport_state *s)
256 s->u.amiga.datadir = 255;
257 s->u.amiga.status = 0;
258 s->u.amiga.statusdir = 0xe0;
261 static void mfc3_save_state(struct parport *p, struct parport_state *s)
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;
273 static void mfc3_restore_state(struct parport *p, struct parport_state *s)
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;
285 static struct parport_operations pp_mfc3_ops = {
286 .write_data = mfc3_write_data,
287 .read_data = mfc3_read_data,
289 .write_control = mfc3_write_control,
290 .read_control = mfc3_read_control,
291 .frob_control = mfc3_frob_control,
293 .read_status = mfc3_read_status,
295 .enable_irq = mfc3_enable_irq,
296 .disable_irq = mfc3_disable_irq,
298 .data_forward = mfc3_data_forward,
299 .data_reverse = mfc3_data_reverse,
301 .init_state = mfc3_init_state,
302 .save_state = mfc3_save_state,
303 .restore_state = mfc3_restore_state,
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,
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,
314 .compat_write_data = parport_ieee1284_write_compat,
315 .nibble_read_data = parport_ieee1284_read_nibble,
316 .byte_read_data = parport_ieee1284_read_byte,
318 .owner = THIS_MODULE,
321 /* ----------- Initialisation code --------------------------------- */
323 static int __init parport_mfc3_init(void)
328 struct zorro_dev *z = NULL;
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"))
338 pp = (struct pia *)ZTWO_VADDR(piabase);
340 pp->pddrb = 255; /* all data pins output */
341 pp->crb = PIA_DDR|32|8;
342 dummy = pp->pddrb; /* reading clears interrupt */
344 pp->pddra = 0xe0; /* /RESET, /DIR ,/AUTO-FEED output */
346 pp->ppra = 0; /* reset printer */
349 p = parport_register_port((unsigned long)pp, IRQ_AMIGA_PORTS,
350 PARPORT_DMA_NONE, &pp_mfc3_ops);
354 if (p->irq != PARPORT_IRQ_NONE) {
356 if (request_irq(IRQ_AMIGA_PORTS, mfc3_interrupt, IRQF_SHARED, p->name, &pp_mfc3_ops))
360 this_port[pias++] = p;
361 printk(KERN_INFO "%s: Multiface III port using irq\n", p->name);
362 /* XXX: set operating mode */
364 p->private_data = (void *)piabase;
365 parport_announce_port (p);
374 release_mem_region(piabase, sizeof(struct pia));
377 return pias ? 0 : -ENODEV;
380 static void __exit parport_mfc3_exit(void)
384 for (i = 0; i < MAX_MFC; i++) {
387 parport_remove_port(this_port[i]);
388 if (!this_port[i]->irq != PARPORT_IRQ_NONE) {
390 free_irq(IRQ_AMIGA_PORTS, &pp_mfc3_ops);
392 release_mem_region(ZTWO_PADDR(this_port[i]->private_data), sizeof(struct pia));
393 parport_put_port(this_port[i]);
398 MODULE_AUTHOR("Joerg Dorchain <joerg@dorchain.net>");
399 MODULE_DESCRIPTION("Parport Driver for Multiface 3 expansion cards Paralllel Port");
400 MODULE_SUPPORTED_DEVICE("Multiface 3 Parallel Port");
401 MODULE_LICENSE("GPL");
403 module_init(parport_mfc3_init)
404 module_exit(parport_mfc3_exit)