Root/drivers/parport/parport_mfc3.c

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

Archive Download this file



interactive