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ppi /
ppi.c
Revision
1.8:
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Wed May 19 22:52:43 2004 UTC (9 years ago) by
dillon
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MAIN
CVS tags:
HEAD,
DragonFly_Stable,
DragonFly_Snap29Sep2004,
DragonFly_Snap13Sep2004,
DragonFly_RELEASE_1_2_Slip,
DragonFly_RELEASE_1_2,
DragonFly_1_0_REL,
DragonFly_1_0_RC1,
DragonFly_1_0A_REL
Device layer rollup commit.
* cdevsw_add() is now required. cdevsw_add() and cdevsw_remove() may specify
a mask/match indicating the range of supported minor numbers. Multiple
cdevsw_add()'s using the same major number, but distinctly different
ranges, may be issued. All devices that failed to call cdevsw_add() before
now do.
* cdevsw_remove() now automatically marks all devices within its supported
range as being destroyed.
* vnode->v_rdev is no longer resolved when the vnode is created. Instead,
only v_udev (a newly added field) is resolved. v_rdev is resolved when
the vnode is opened and cleared on the last close.
* A great deal of code was making rather dubious assumptions with regards
to the validity of devices associated with vnodes, primarily due to
the persistence of a device structure due to being indexed by (major, minor)
instead of by (cdevsw, major, minor). In particular, if you run a program
which connects to a USB device and then you pull the USB device and plug
it back in, the vnode subsystem will continue to believe that the device
is open when, in fact, it isn't (because it was destroyed and recreated).
In particular, note that all the VFS mount procedures now check devices
via v_udev instead of v_rdev prior to calling VOP_OPEN(), since v_rdev
is NULL prior to the first open.
* The disk layer's device interaction has been rewritten. The disk layer
(i.e. the slice and disklabel management layer) no longer overloads
its data onto the device structure representing the underlying physical
disk. Instead, the disk layer uses the new cdevsw_add() functionality
to register its own cdevsw using the underlying device's major number,
and simply does NOT register the underlying device's cdevsw. No
confusion is created because the device hash is now based on
(cdevsw,major,minor) rather then (major,minor).
NOTE: This also means that underlying raw disk devices may use the entire
device minor number instead of having to reserve the bits used by the disk
layer, and also means that can we (theoretically) stack a fully
disklabel-supported 'disk' on top of any block device.
* The new reference counting scheme prevents this by associating a device
with a cdevsw and disconnecting the device from its cdevsw when the cdevsw
is removed. Additionally, all udev2dev() lookups run through the cdevsw
mask/match and only successfully find devices still associated with an
active cdevsw.
* Major work on MFS: MFS no longer shortcuts vnode and device creation. It
now creates a real vnode and a real device and implements real open and
close VOPs. Additionally, due to the disk layer changes, MFS is no longer
limited to 255 mounts. The new limit is 16 million. Since MFS creates a
real device node, mount_mfs will now create a real /dev/mfs<PID> device
that can be read from userland (e.g. so you can dump an MFS filesystem).
* BUF AND DEVICE STRATEGY changes. The struct buf contains a b_dev field.
In order to properly handle stacked devices we now require that the b_dev
field be initialized before the device strategy routine is called. This
required some additional work in various VFS implementations. To enforce
this requirement, biodone() now sets b_dev to NODEV. The new disk layer
will adjust b_dev before forwarding a request to the actual physical
device.
* A bug in the ISO CD boot sequence which resulted in a panic has been fixed.
Testing by: lots of people, but David Rhodus found the most aggregious bugs.
1: /*-
2: * Copyright (c) 1997, 1998, 1999 Nicolas Souchu, Michael Smith
3: * All rights reserved.
4: *
5: * Redistribution and use in source and binary forms, with or without
6: * modification, are permitted provided that the following conditions
7: * are met:
8: * 1. Redistributions of source code must retain the above copyright
9: * notice, this list of conditions and the following disclaimer.
10: * 2. Redistributions in binary form must reproduce the above copyright
11: * notice, this list of conditions and the following disclaimer in the
12: * documentation and/or other materials provided with the distribution.
13: *
14: * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17: * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
24: * SUCH DAMAGE.
25: *
26: * $FreeBSD: src/sys/dev/ppbus/ppi.c,v 1.21.2.3 2000/08/07 18:24:43 peter Exp $
27: * $DragonFly: src/sys/dev/misc/ppi/ppi.c,v 1.8 2004/05/19 22:52:43 dillon Exp $
28: *
29: */
30: #include "opt_ppb_1284.h"
31:
32: #include <sys/param.h>
33: #include <sys/systm.h>
34: #include <sys/module.h>
35: #include <sys/bus.h>
36: #include <sys/conf.h>
37: #include <sys/kernel.h>
38: #include <sys/uio.h>
39: #include <sys/fcntl.h>
40:
41: #include <machine/clock.h>
42: #include <machine/bus.h>
43: #include <machine/resource.h>
44: #include <sys/rman.h>
45:
46: #include <bus/ppbus/ppbconf.h>
47: #include <bus/ppbus/ppb_msq.h>
48:
49: #ifdef PERIPH_1284
50: #include <bus/ppbus/ppb_1284.h>
51: #endif
52:
53: #include "ppi.h"
54:
55: #include "ppbus_if.h"
56:
57: #include <bus/ppbus/ppbio.h>
58:
59: #define BUFSIZE 512
60:
61: struct ppi_data {
62:
63: int ppi_unit;
64: int ppi_flags;
65: #define HAVE_PPBUS (1<<0)
66: #define HAD_PPBUS (1<<1)
67:
68: int ppi_count;
69: int ppi_mode; /* IEEE1284 mode */
70: char ppi_buffer[BUFSIZE];
71:
72: #ifdef PERIPH_1284
73: struct resource *intr_resource; /* interrupt resource */
74: void *intr_cookie; /* interrupt registration cookie */
75: #endif /* PERIPH_1284 */
76: };
77:
78: #define DEVTOSOFTC(dev) \
79: ((struct ppi_data *)device_get_softc(dev))
80: #define UNITOSOFTC(unit) \
81: ((struct ppi_data *)devclass_get_softc(ppi_devclass, (unit)))
82: #define UNITODEVICE(unit) \
83: (devclass_get_device(ppi_devclass, (unit)))
84:
85: static devclass_t ppi_devclass;
86:
87: static d_open_t ppiopen;
88: static d_close_t ppiclose;
89: static d_ioctl_t ppiioctl;
90: static d_write_t ppiwrite;
91: static d_read_t ppiread;
92:
93: #define CDEV_MAJOR 82
94: static struct cdevsw ppi_cdevsw = {
95: /* name */ "ppi",
96: /* maj */ CDEV_MAJOR,
97: /* flags */ 0,
98: /* port */ NULL,
99: /* clone */ NULL,
100:
101: /* open */ ppiopen,
102: /* close */ ppiclose,
103: /* read */ ppiread,
104: /* write */ ppiwrite,
105: /* ioctl */ ppiioctl,
106: /* poll */ nopoll,
107: /* mmap */ nommap,
108: /* strategy */ nostrategy,
109: /* dump */ nodump,
110: /* psize */ nopsize
111: };
112:
113: #ifdef PERIPH_1284
114:
115: static void
116: ppi_enable_intr(device_t ppidev)
117: {
118: char r;
119: device_t ppbus = device_get_parent(ppidev);
120:
121: r = ppb_rctr(ppbus);
122: ppb_wctr(ppbus, r | IRQENABLE);
123:
124: return;
125: }
126:
127: static void
128: ppi_disable_intr(device_t ppidev)
129: {
130: char r;
131: device_t ppbus = device_get_parent(ppidev);
132:
133: r = ppb_rctr(ppbus);
134: ppb_wctr(ppbus, r & ~IRQENABLE);
135:
136: return;
137: }
138:
139: #endif /* PERIPH_1284 */
140:
141: static void
142: ppi_identify(driver_t *driver, device_t parent)
143: {
144:
145: BUS_ADD_CHILD(parent, 0, "ppi", 0);
146: }
147:
148: /*
149: * ppi_probe()
150: */
151: static int
152: ppi_probe(device_t dev)
153: {
154: struct ppi_data *ppi;
155:
156: /* probe is always ok */
157: device_set_desc(dev, "Parallel I/O");
158:
159: ppi = DEVTOSOFTC(dev);
160: bzero(ppi, sizeof(struct ppi_data));
161:
162: return (0);
163: }
164:
165: /*
166: * ppi_attach()
167: */
168: static int
169: ppi_attach(device_t dev)
170: {
171: #ifdef PERIPH_1284
172: uintptr_t irq;
173: int zero = 0;
174: struct ppi_data *ppi = DEVTOSOFTC(dev);
175:
176: /* retrive the irq */
177: BUS_READ_IVAR(device_get_parent(dev), dev, PPBUS_IVAR_IRQ, &irq);
178:
179: /* declare our interrupt handler */
180: ppi->intr_resource = bus_alloc_resource(dev, SYS_RES_IRQ,
181: &zero, irq, irq, 1, RF_ACTIVE);
182: #endif /* PERIPH_1284 */
183:
184: cdevsw_add(&ppi_cdevsw, -1, device_get_unit(dev));
185: make_dev(&ppi_cdevsw, device_get_unit(dev), /* XXX cleanup */
186: UID_ROOT, GID_WHEEL,
187: 0600, "ppi%d", device_get_unit(dev));
188:
189: return (0);
190: }
191:
192: #ifdef PERIPH_1284
193: /*
194: * Cable
195: * -----
196: *
197: * Use an IEEE1284 compliant (DB25/DB25) cable with the following tricks:
198: *
199: * nStrobe <-> nAck 1 <-> 10
200: * nAutofd <-> Busy 11 <-> 14
201: * nSelectin <-> Select 17 <-> 13
202: * nInit <-> nFault 15 <-> 16
203: *
204: */
205: static void
206: ppiintr(void *arg)
207: {
208: device_t ppidev = (device_t)arg;
209: device_t ppbus = device_get_parent(ppidev);
210: struct ppi_data *ppi = DEVTOSOFTC(ppidev);
211:
212: ppi_disable_intr(ppidev);
213:
214: switch (ppb_1284_get_state(ppbus)) {
215:
216: /* accept IEEE1284 negociation then wakeup an waiting process to
217: * continue negociation at process level */
218: case PPB_FORWARD_IDLE:
219: /* Event 1 */
220: if ((ppb_rstr(ppbus) & (SELECT | nBUSY)) ==
221: (SELECT | nBUSY)) {
222: /* IEEE1284 negociation */
223: #ifdef DEBUG_1284
224: printf("N");
225: #endif
226:
227: /* Event 2 - prepare for reading the ext. value */
228: ppb_wctr(ppbus, (PCD | STROBE | nINIT) & ~SELECTIN);
229:
230: ppb_1284_set_state(ppbus, PPB_NEGOCIATION);
231:
232: } else {
233: #ifdef DEBUG_1284
234: printf("0x%x", ppb_rstr(ppbus));
235: #endif
236: ppb_peripheral_terminate(ppbus, PPB_DONTWAIT);
237: break;
238: }
239:
240: /* wake up any process waiting for negociation from
241: * remote master host */
242:
243: /* XXX should set a variable to warn the process about
244: * the interrupt */
245:
246: wakeup(ppi);
247: break;
248: default:
249: #ifdef DEBUG_1284
250: printf("?%d", ppb_1284_get_state(ppbus));
251: #endif
252: ppb_1284_set_state(ppbus, PPB_FORWARD_IDLE);
253: ppb_set_mode(ppbus, PPB_COMPATIBLE);
254: break;
255: }
256:
257: ppi_enable_intr(ppidev);
258:
259: return;
260: }
261: #endif /* PERIPH_1284 */
262:
263: static int
264: ppiopen(dev_t dev, int flags, int fmt, d_thread_t *td)
265: {
266: u_int unit = minor(dev);
267: struct ppi_data *ppi = UNITOSOFTC(unit);
268: device_t ppidev = UNITODEVICE(unit);
269: device_t ppbus = device_get_parent(ppidev);
270: int res;
271:
272: if (!ppi)
273: return (ENXIO);
274:
275: if (!(ppi->ppi_flags & HAVE_PPBUS)) {
276: if ((res = ppb_request_bus(ppbus, ppidev,
277: (flags & O_NONBLOCK) ? PPB_DONTWAIT :
278: (PPB_WAIT | PPB_INTR))))
279: return (res);
280:
281: ppi->ppi_flags |= HAVE_PPBUS;
282:
283: #ifdef PERIPH_1284
284: if (ppi->intr_resource) {
285: /* register our interrupt handler */
286: BUS_SETUP_INTR(device_get_parent(ppidev), ppidev, ppi->intr_resource,
287: INTR_TYPE_TTY, ppiintr, dev, &ppi->intr_cookie);
288: }
289: #endif /* PERIPH_1284 */
290: }
291: ppi->ppi_count += 1;
292:
293: return (0);
294: }
295:
296: static int
297: ppiclose(dev_t dev, int flags, int fmt, d_thread_t *td)
298: {
299: u_int unit = minor(dev);
300: struct ppi_data *ppi = UNITOSOFTC(unit);
301: device_t ppidev = UNITODEVICE(unit);
302: device_t ppbus = device_get_parent(ppidev);
303:
304: ppi->ppi_count --;
305: if (!ppi->ppi_count) {
306:
307: #ifdef PERIPH_1284
308: switch (ppb_1284_get_state(ppbus)) {
309: case PPB_PERIPHERAL_IDLE:
310: ppb_peripheral_terminate(ppbus, 0);
311: break;
312: case PPB_REVERSE_IDLE:
313: case PPB_EPP_IDLE:
314: case PPB_ECP_FORWARD_IDLE:
315: default:
316: ppb_1284_terminate(ppbus);
317: break;
318: }
319: #endif /* PERIPH_1284 */
320:
321: /* unregistration of interrupt forced by release */
322: ppb_release_bus(ppbus, ppidev);
323:
324: ppi->ppi_flags &= ~HAVE_PPBUS;
325: }
326:
327: return (0);
328: }
329:
330: /*
331: * ppiread()
332: *
333: * IEEE1284 compliant read.
334: *
335: * First, try negociation to BYTE then NIBBLE mode
336: * If no data is available, wait for it otherwise transfer as much as possible
337: */
338: static int
339: ppiread(dev_t dev, struct uio *uio, int ioflag)
340: {
341: #ifdef PERIPH_1284
342: u_int unit = minor(dev);
343: struct ppi_data *ppi = UNITOSOFTC(unit);
344: device_t ppidev = UNITODEVICE(unit);
345: device_t ppbus = device_get_parent(ppidev);
346: int len, error = 0;
347:
348: switch (ppb_1284_get_state(ppbus)) {
349: case PPB_PERIPHERAL_IDLE:
350: ppb_peripheral_terminate(ppbus, 0);
351: /* fall throught */
352:
353: case PPB_FORWARD_IDLE:
354: /* if can't negociate NIBBLE mode then try BYTE mode,
355: * the peripheral may be a computer
356: */
357: if ((ppb_1284_negociate(ppbus,
358: ppi->ppi_mode = PPB_NIBBLE, 0))) {
359:
360: /* XXX Wait 2 seconds to let the remote host some
361: * time to terminate its interrupt
362: */
363: tsleep(ppi, 0, "ppiread", 2*hz);
364:
365: if ((error = ppb_1284_negociate(ppbus,
366: ppi->ppi_mode = PPB_BYTE, 0)))
367: return (error);
368: }
369: break;
370:
371: case PPB_REVERSE_IDLE:
372: case PPB_EPP_IDLE:
373: case PPB_ECP_FORWARD_IDLE:
374: default:
375: break;
376: }
377:
378: #ifdef DEBUG_1284
379: printf("N");
380: #endif
381: /* read data */
382: len = 0;
383: while (uio->uio_resid) {
384: if ((error = ppb_1284_read(ppbus, ppi->ppi_mode,
385: ppi->ppi_buffer, min(BUFSIZE, uio->uio_resid),
386: &len))) {
387: goto error;
388: }
389:
390: if (!len)
391: goto error; /* no more data */
392:
393: #ifdef DEBUG_1284
394: printf("d");
395: #endif
396: if ((error = uiomove(ppi->ppi_buffer, len, uio)))
397: goto error;
398: }
399:
400: error:
401:
402: #else /* PERIPH_1284 */
403: int error = ENODEV;
404: #endif
405:
406: return (error);
407: }
408:
409: /*
410: * ppiwrite()
411: *
412: * IEEE1284 compliant write
413: *
414: * Actually, this is the peripheral side of a remote IEEE1284 read
415: *
416: * The first part of the negociation (IEEE1284 device detection) is
417: * done at interrupt level, then the remaining is done by the writing
418: * process
419: *
420: * Once negociation done, transfer data
421: */
422: static int
423: ppiwrite(dev_t dev, struct uio *uio, int ioflag)
424: {
425: #ifdef PERIPH_1284
426: u_int unit = minor(dev);
427: struct ppi_data *ppi = UNITOSOFTC(unit);
428: device_t ppidev = UNITODEVICE(unit);
429: device_t ppbus = device_get_parent(ppidev);
430: int len, error = 0, sent;
431:
432: #if 0
433: int ret;
434:
435: #define ADDRESS MS_PARAM(0, 0, MS_TYP_PTR)
436: #define LENGTH MS_PARAM(0, 1, MS_TYP_INT)
437:
438: struct ppb_microseq msq[] = {
439: { MS_OP_PUT, { MS_UNKNOWN, MS_UNKNOWN, MS_UNKNOWN } },
440: MS_RET(0)
441: };
442:
443: /* negociate ECP mode */
444: if (ppb_1284_negociate(ppbus, PPB_ECP, 0)) {
445: printf("ppiwrite: ECP negociation failed\n");
446: }
447:
448: while (!error && (len = min(uio->uio_resid, BUFSIZE))) {
449: uiomove(ppi->ppi_buffer, len, uio);
450:
451: ppb_MS_init_msq(msq, 2, ADDRESS, ppi->ppi_buffer, LENGTH, len);
452:
453: error = ppb_MS_microseq(ppbus, msq, &ret);
454: }
455: #endif
456:
457: /* we have to be peripheral to be able to send data, so
458: * wait for the appropriate state
459: */
460: if (ppb_1284_get_state(ppbus) < PPB_PERIPHERAL_NEGOCIATION)
461: ppb_1284_terminate(ppbus);
462:
463: while (ppb_1284_get_state(ppbus) != PPB_PERIPHERAL_IDLE) {
464: /* XXX should check a variable before sleeping */
465: #ifdef DEBUG_1284
466: printf("s");
467: #endif
468:
469: ppi_enable_intr(ppidev);
470:
471: /* sleep until IEEE1284 negociation starts */
472: error = tsleep(ppi, PCATCH, "ppiwrite", 0);
473:
474: switch (error) {
475: case 0:
476: /* negociate peripheral side with BYTE mode */
477: ppb_peripheral_negociate(ppbus, PPB_BYTE, 0);
478: break;
479: case EWOULDBLOCK:
480: break;
481: default:
482: goto error;
483: }
484: }
485: #ifdef DEBUG_1284
486: printf("N");
487: #endif
488:
489: /* negociation done, write bytes to master host */
490: while ((len = min(uio->uio_resid, BUFSIZE)) != 0) {
491: uiomove(ppi->ppi_buffer, len, uio);
492: if ((error = byte_peripheral_write(ppbus,
493: ppi->ppi_buffer, len, &sent)))
494: goto error;
495: #ifdef DEBUG_1284
496: printf("d");
497: #endif
498: }
499:
500: error:
501:
502: #else /* PERIPH_1284 */
503: int error = ENODEV;
504: #endif
505:
506: return (error);
507: }
508:
509: static int
510: ppiioctl(dev_t dev, u_long cmd, caddr_t data, int flags, d_thread_t *td)
511: {
512: u_int unit = minor(dev);
513: device_t ppidev = UNITODEVICE(unit);
514: device_t ppbus = device_get_parent(ppidev);
515: int error = 0;
516: u_int8_t *val = (u_int8_t *)data;
517:
518: switch (cmd) {
519:
520: case PPIGDATA: /* get data register */
521: *val = ppb_rdtr(ppbus);
522: break;
523: case PPIGSTATUS: /* get status bits */
524: *val = ppb_rstr(ppbus);
525: break;
526: case PPIGCTRL: /* get control bits */
527: *val = ppb_rctr(ppbus);
528: break;
529: case PPIGEPPD: /* get EPP data bits */
530: *val = ppb_repp_D(ppbus);
531: break;
532: case PPIGECR: /* get ECP bits */
533: *val = ppb_recr(ppbus);
534: break;
535: case PPIGFIFO: /* read FIFO */
536: *val = ppb_rfifo(ppbus);
537: break;
538: case PPISDATA: /* set data register */
539: ppb_wdtr(ppbus, *val);
540: break;
541: case PPISSTATUS: /* set status bits */
542: ppb_wstr(ppbus, *val);
543: break;
544: case PPISCTRL: /* set control bits */
545: ppb_wctr(ppbus, *val);
546: break;
547: case PPISEPPD: /* set EPP data bits */
548: ppb_wepp_D(ppbus, *val);
549: break;
550: case PPISECR: /* set ECP bits */
551: ppb_wecr(ppbus, *val);
552: break;
553: case PPISFIFO: /* write FIFO */
554: ppb_wfifo(ppbus, *val);
555: break;
556: case PPIGEPPA: /* get EPP address bits */
557: *val = ppb_repp_A(ppbus);
558: break;
559: case PPISEPPA: /* set EPP address bits */
560: ppb_wepp_A(ppbus, *val);
561: break;
562: default:
563: error = ENOTTY;
564: break;
565: }
566:
567: return (error);
568: }
569:
570: static device_method_t ppi_methods[] = {
571: /* device interface */
572: DEVMETHOD(device_identify, ppi_identify),
573: DEVMETHOD(device_probe, ppi_probe),
574: DEVMETHOD(device_attach, ppi_attach),
575:
576: { 0, 0 }
577: };
578:
579: static driver_t ppi_driver = {
580: "ppi",
581: ppi_methods,
582: sizeof(struct ppi_data),
583: };
584: DRIVER_MODULE(ppi, ppbus, ppi_driver, ppi_devclass, 0, 0);
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