Deleted Added
sdiff udiff text old ( 146214 ) new ( 199104 )
full compact
isa_dma.c (146214) isa_dma.c (199104)
1/*-
2 * Copyright (c) 1991 The Regents of the University of California.
3 * All rights reserved.
4 *
5 * This code is derived from software contributed to Berkeley by
6 * William Jolitz.
7 *
8 * Redistribution and use in source and binary forms, with or without

--- 19 unchanged lines hidden (view full) ---

28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
30 * SUCH DAMAGE.
31 *
32 * from: @(#)isa.c 7.2 (Berkeley) 5/13/91
33 */
34
35#include <sys/cdefs.h>
1/*-
2 * Copyright (c) 1991 The Regents of the University of California.
3 * All rights reserved.
4 *
5 * This code is derived from software contributed to Berkeley by
6 * William Jolitz.
7 *
8 * Redistribution and use in source and binary forms, with or without

--- 19 unchanged lines hidden (view full) ---

28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
30 * SUCH DAMAGE.
31 *
32 * from: @(#)isa.c 7.2 (Berkeley) 5/13/91
33 */
34
35#include <sys/cdefs.h>
36__FBSDID("$FreeBSD: head/sys/i386/isa/isa_dma.c 146214 2005-05-14 10:14:56Z nyan $");
36__FBSDID("$FreeBSD: head/sys/i386/isa/isa_dma.c 199104 2009-11-09 20:29:10Z rdivacky $");
37
38/*
39 * code to manage AT bus
40 *
41 * 92/08/18 Frank P. MacLachlan (fpm@crash.cts.com):
42 * Fixed uninitialized variable problem and added code to deal
43 * with DMA page boundaries in isa_dmarangecheck(). Fixed word
44 * mode DMA count compution and reorganized DMA setup code in

--- 19 unchanged lines hidden (view full) ---

64static int isa_dmarangecheck(caddr_t va, u_int length, int chan);
65
66static caddr_t dma_bouncebuf[8];
67static u_int dma_bouncebufsize[8];
68static u_int8_t dma_bounced = 0;
69static u_int8_t dma_busy = 0; /* Used in isa_dmastart() */
70static u_int8_t dma_inuse = 0; /* User for acquire/release */
71static u_int8_t dma_auto_mode = 0;
37
38/*
39 * code to manage AT bus
40 *
41 * 92/08/18 Frank P. MacLachlan (fpm@crash.cts.com):
42 * Fixed uninitialized variable problem and added code to deal
43 * with DMA page boundaries in isa_dmarangecheck(). Fixed word
44 * mode DMA count compution and reorganized DMA setup code in

--- 19 unchanged lines hidden (view full) ---

64static int isa_dmarangecheck(caddr_t va, u_int length, int chan);
65
66static caddr_t dma_bouncebuf[8];
67static u_int dma_bouncebufsize[8];
68static u_int8_t dma_bounced = 0;
69static u_int8_t dma_busy = 0; /* Used in isa_dmastart() */
70static u_int8_t dma_inuse = 0; /* User for acquire/release */
71static u_int8_t dma_auto_mode = 0;
72static struct mtx isa_dma_lock;
73MTX_SYSINIT(isa_dma_lock, &isa_dma_lock, "isa DMA lock", MTX_DEF);
72
73#define VALID_DMA_MASK (7)
74
75/* high byte of address is stored in this port for i-th dma channel */
76static int dmapageport[8] = { 0x87, 0x83, 0x81, 0x82, 0x8f, 0x8b, 0x89, 0x8a };
77
78/*
79 * Setup a DMA channel's bounce buffer.
80 */
81int
82isa_dma_init(int chan, u_int bouncebufsize, int flag)
83{
84 void *buf;
74
75#define VALID_DMA_MASK (7)
76
77/* high byte of address is stored in this port for i-th dma channel */
78static int dmapageport[8] = { 0x87, 0x83, 0x81, 0x82, 0x8f, 0x8b, 0x89, 0x8a };
79
80/*
81 * Setup a DMA channel's bounce buffer.
82 */
83int
84isa_dma_init(int chan, u_int bouncebufsize, int flag)
85{
86 void *buf;
87 int contig;
85
88
86 /*
87 * If a DMA channel is shared, both drivers have to call isa_dma_init
88 * since they don't know that the other driver will do it.
89 * Just return if we're already set up good.
90 * XXX: this only works if they agree on the bouncebuf size. This
91 * XXX: is typically the case since they are multiple instances of
92 * XXX: the same driver.
93 */
94 if (dma_bouncebuf[chan] != NULL)
95 return (0);
96
97#ifdef DIAGNOSTIC
98 if (chan & ~VALID_DMA_MASK)
99 panic("isa_dma_init: channel out of range");
100#endif
101
89#ifdef DIAGNOSTIC
90 if (chan & ~VALID_DMA_MASK)
91 panic("isa_dma_init: channel out of range");
92#endif
93
102 dma_bouncebufsize[chan] = bouncebufsize;
103
104 /* Try malloc() first. It works better if it works. */
105 buf = malloc(bouncebufsize, M_DEVBUF, flag);
106 if (buf != NULL) {
94
95 /* Try malloc() first. It works better if it works. */
96 buf = malloc(bouncebufsize, M_DEVBUF, flag);
97 if (buf != NULL) {
107 if (isa_dmarangecheck(buf, bouncebufsize, chan) == 0) {
108 dma_bouncebuf[chan] = buf;
109 return (0);
98 if (isa_dmarangecheck(buf, bouncebufsize, chan) != 0) {
99 free(buf, M_DEVBUF);
100 buf = NULL;
110 }
101 }
111 free(buf, M_DEVBUF);
102 contig = 0;
112 }
103 }
113 buf = contigmalloc(bouncebufsize, M_DEVBUF, flag, 0ul, 0xfffffful,
104
105 if (buf == NULL) {
106 buf = contigmalloc(bouncebufsize, M_DEVBUF, flag, 0ul, 0xfffffful,
114 1ul, chan & 4 ? 0x20000ul : 0x10000ul);
107 1ul, chan & 4 ? 0x20000ul : 0x10000ul);
108 contig = 1;
109 }
110
115 if (buf == NULL)
116 return (ENOMEM);
111 if (buf == NULL)
112 return (ENOMEM);
113
114 mtx_lock(&isa_dma_lock);
115 /*
116 * If a DMA channel is shared, both drivers have to call isa_dma_init
117 * since they don't know that the other driver will do it.
118 * Just return if we're already set up good.
119 * XXX: this only works if they agree on the bouncebuf size. This
120 * XXX: is typically the case since they are multiple instances of
121 * XXX: the same driver.
122 */
123 if (dma_bouncebuf[chan] != NULL) {
124 if (contig)
125 contigfree(buf, bouncebufsize, M_DEVBUF);
126 else
127 free(buf, M_DEVBUF);
128 mtx_unlock(&isa_dma_lock);
129 return (0);
130 }
131
132 dma_bouncebufsize[chan] = bouncebufsize;
117 dma_bouncebuf[chan] = buf;
133 dma_bouncebuf[chan] = buf;
134
135 mtx_unlock(&isa_dma_lock);
136
118 return (0);
119}
120
121/*
122 * Register a DMA channel's usage. Usually called from a device driver
123 * in open() or during its initialization.
124 */
125int
126isa_dma_acquire(chan)
127 int chan;
128{
129#ifdef DIAGNOSTIC
130 if (chan & ~VALID_DMA_MASK)
131 panic("isa_dma_acquire: channel out of range");
132#endif
133
137 return (0);
138}
139
140/*
141 * Register a DMA channel's usage. Usually called from a device driver
142 * in open() or during its initialization.
143 */
144int
145isa_dma_acquire(chan)
146 int chan;
147{
148#ifdef DIAGNOSTIC
149 if (chan & ~VALID_DMA_MASK)
150 panic("isa_dma_acquire: channel out of range");
151#endif
152
153 mtx_lock(&isa_dma_lock);
134 if (dma_inuse & (1 << chan)) {
135 printf("isa_dma_acquire: channel %d already in use\n", chan);
154 if (dma_inuse & (1 << chan)) {
155 printf("isa_dma_acquire: channel %d already in use\n", chan);
156 mtx_unlock(&isa_dma_lock);
136 return (EBUSY);
137 }
138 dma_inuse |= (1 << chan);
139 dma_auto_mode &= ~(1 << chan);
157 return (EBUSY);
158 }
159 dma_inuse |= (1 << chan);
160 dma_auto_mode &= ~(1 << chan);
161 mtx_unlock(&isa_dma_lock);
140
141 return (0);
142}
143
144/*
145 * Unregister a DMA channel's usage. Usually called from a device driver
146 * during close() or during its shutdown.
147 */
148void
149isa_dma_release(chan)
150 int chan;
151{
152#ifdef DIAGNOSTIC
153 if (chan & ~VALID_DMA_MASK)
154 panic("isa_dma_release: channel out of range");
155
162
163 return (0);
164}
165
166/*
167 * Unregister a DMA channel's usage. Usually called from a device driver
168 * during close() or during its shutdown.
169 */
170void
171isa_dma_release(chan)
172 int chan;
173{
174#ifdef DIAGNOSTIC
175 if (chan & ~VALID_DMA_MASK)
176 panic("isa_dma_release: channel out of range");
177
178 mtx_lock(&isa_dma_lock);
156 if ((dma_inuse & (1 << chan)) == 0)
157 printf("isa_dma_release: channel %d not in use\n", chan);
179 if ((dma_inuse & (1 << chan)) == 0)
180 printf("isa_dma_release: channel %d not in use\n", chan);
181#else
182 mtx_lock(&isa_dma_lock);
158#endif
159
160 if (dma_busy & (1 << chan)) {
161 dma_busy &= ~(1 << chan);
162 /*
163 * XXX We should also do "dma_bounced &= (1 << chan);"
164 * because we are acting on behalf of isa_dmadone() which
165 * was not called to end the last DMA operation. This does
166 * not matter now, but it may in the future.
167 */
168 }
169
170 dma_inuse &= ~(1 << chan);
171 dma_auto_mode &= ~(1 << chan);
183#endif
184
185 if (dma_busy & (1 << chan)) {
186 dma_busy &= ~(1 << chan);
187 /*
188 * XXX We should also do "dma_bounced &= (1 << chan);"
189 * because we are acting on behalf of isa_dmadone() which
190 * was not called to end the last DMA operation. This does
191 * not matter now, but it may in the future.
192 */
193 }
194
195 dma_inuse &= ~(1 << chan);
196 dma_auto_mode &= ~(1 << chan);
197
198 mtx_unlock(&isa_dma_lock);
172}
173
174/*
175 * isa_dmacascade(): program 8237 DMA controller channel to accept
176 * external dma control by a board.
177 */
178void
179isa_dmacascade(chan)
180 int chan;
181{
182#ifdef DIAGNOSTIC
183 if (chan & ~VALID_DMA_MASK)
184 panic("isa_dmacascade: channel out of range");
185#endif
186
199}
200
201/*
202 * isa_dmacascade(): program 8237 DMA controller channel to accept
203 * external dma control by a board.
204 */
205void
206isa_dmacascade(chan)
207 int chan;
208{
209#ifdef DIAGNOSTIC
210 if (chan & ~VALID_DMA_MASK)
211 panic("isa_dmacascade: channel out of range");
212#endif
213
214 mtx_lock(&isa_dma_lock);
187 /* set dma channel mode, and set dma channel mode */
188 if ((chan & 4) == 0) {
189 outb(DMA1_MODE, DMA37MD_CASCADE | chan);
190 outb(DMA1_SMSK, chan);
191 } else {
192 outb(DMA2_MODE, DMA37MD_CASCADE | (chan & 3));
193 outb(DMA2_SMSK, chan & 3);
194 }
215 /* set dma channel mode, and set dma channel mode */
216 if ((chan & 4) == 0) {
217 outb(DMA1_MODE, DMA37MD_CASCADE | chan);
218 outb(DMA1_SMSK, chan);
219 } else {
220 outb(DMA2_MODE, DMA37MD_CASCADE | (chan & 3));
221 outb(DMA2_SMSK, chan & 3);
222 }
223 mtx_unlock(&isa_dma_lock);
195}
196
197/*
198 * isa_dmastart(): program 8237 DMA controller channel, avoid page alignment
199 * problems by using a bounce buffer.
200 */
201void
202isa_dmastart(int flags, caddr_t addr, u_int nbytes, int chan)
203{
204 vm_paddr_t phys;
205 int waport;
206 caddr_t newaddr;
224}
225
226/*
227 * isa_dmastart(): program 8237 DMA controller channel, avoid page alignment
228 * problems by using a bounce buffer.
229 */
230void
231isa_dmastart(int flags, caddr_t addr, u_int nbytes, int chan)
232{
233 vm_paddr_t phys;
234 int waport;
235 caddr_t newaddr;
236 int dma_range_checked;
207
237
208 GIANT_REQUIRED;
238 /* translate to physical */
239 phys = pmap_extract(kernel_pmap, (vm_offset_t)addr);
240 dma_range_checked = isa_dmarangecheck(addr, nbytes, chan);
209
210#ifdef DIAGNOSTIC
211 if (chan & ~VALID_DMA_MASK)
212 panic("isa_dmastart: channel out of range");
213
214 if ((chan < 4 && nbytes > (1<<16))
215 || (chan >= 4 && (nbytes > (1<<17) || (u_int)addr & 1)))
216 panic("isa_dmastart: impossible request");
217
241
242#ifdef DIAGNOSTIC
243 if (chan & ~VALID_DMA_MASK)
244 panic("isa_dmastart: channel out of range");
245
246 if ((chan < 4 && nbytes > (1<<16))
247 || (chan >= 4 && (nbytes > (1<<17) || (u_int)addr & 1)))
248 panic("isa_dmastart: impossible request");
249
250 mtx_lock(&isa_dma_lock);
218 if ((dma_inuse & (1 << chan)) == 0)
219 printf("isa_dmastart: channel %d not acquired\n", chan);
251 if ((dma_inuse & (1 << chan)) == 0)
252 printf("isa_dmastart: channel %d not acquired\n", chan);
253#else
254 mtx_lock(&isa_dma_lock);
220#endif
221
222#if 0
223 /*
224 * XXX This should be checked, but drivers like ad1848 only call
225 * isa_dmastart() once because they use Auto DMA mode. If we
226 * leave this in, drivers that do this will print this continuously.
227 */
228 if (dma_busy & (1 << chan))
229 printf("isa_dmastart: channel %d busy\n", chan);
230#endif
231
232 dma_busy |= (1 << chan);
233
255#endif
256
257#if 0
258 /*
259 * XXX This should be checked, but drivers like ad1848 only call
260 * isa_dmastart() once because they use Auto DMA mode. If we
261 * leave this in, drivers that do this will print this continuously.
262 */
263 if (dma_busy & (1 << chan))
264 printf("isa_dmastart: channel %d busy\n", chan);
265#endif
266
267 dma_busy |= (1 << chan);
268
234 if (isa_dmarangecheck(addr, nbytes, chan)) {
269 if (dma_range_checked) {
235 if (dma_bouncebuf[chan] == NULL
236 || dma_bouncebufsize[chan] < nbytes)
237 panic("isa_dmastart: bad bounce buffer");
238 dma_bounced |= (1 << chan);
239 newaddr = dma_bouncebuf[chan];
240
241 /* copy bounce buffer on write */
242 if (!(flags & ISADMA_READ))
243 bcopy(addr, newaddr, nbytes);
244 addr = newaddr;
245 }
246
270 if (dma_bouncebuf[chan] == NULL
271 || dma_bouncebufsize[chan] < nbytes)
272 panic("isa_dmastart: bad bounce buffer");
273 dma_bounced |= (1 << chan);
274 newaddr = dma_bouncebuf[chan];
275
276 /* copy bounce buffer on write */
277 if (!(flags & ISADMA_READ))
278 bcopy(addr, newaddr, nbytes);
279 addr = newaddr;
280 }
281
247 /* translate to physical */
248 phys = pmap_extract(kernel_pmap, (vm_offset_t)addr);
249
250 if (flags & ISADMA_RAW) {
251 dma_auto_mode |= (1 << chan);
252 } else {
253 dma_auto_mode &= ~(1 << chan);
254 }
255
256 if ((chan & 4) == 0) {
257 /*

--- 58 unchanged lines hidden (view full) ---

316 /* send count */
317 nbytes >>= 1;
318 outb(waport + 2, --nbytes);
319 outb(waport + 2, nbytes>>8);
320
321 /* unmask channel */
322 outb(DMA2_SMSK, chan & 3);
323 }
282 if (flags & ISADMA_RAW) {
283 dma_auto_mode |= (1 << chan);
284 } else {
285 dma_auto_mode &= ~(1 << chan);
286 }
287
288 if ((chan & 4) == 0) {
289 /*

--- 58 unchanged lines hidden (view full) ---

348 /* send count */
349 nbytes >>= 1;
350 outb(waport + 2, --nbytes);
351 outb(waport + 2, nbytes>>8);
352
353 /* unmask channel */
354 outb(DMA2_SMSK, chan & 3);
355 }
356 mtx_unlock(&isa_dma_lock);
324}
325
326void
327isa_dmadone(int flags, caddr_t addr, int nbytes, int chan)
328{
329#ifdef DIAGNOSTIC
330 if (chan & ~VALID_DMA_MASK)
331 panic("isa_dmadone: channel out of range");
332
333 if ((dma_inuse & (1 << chan)) == 0)
334 printf("isa_dmadone: channel %d not acquired\n", chan);
335#endif
336
357}
358
359void
360isa_dmadone(int flags, caddr_t addr, int nbytes, int chan)
361{
362#ifdef DIAGNOSTIC
363 if (chan & ~VALID_DMA_MASK)
364 panic("isa_dmadone: channel out of range");
365
366 if ((dma_inuse & (1 << chan)) == 0)
367 printf("isa_dmadone: channel %d not acquired\n", chan);
368#endif
369
370 mtx_lock(&isa_dma_lock);
337 if (((dma_busy & (1 << chan)) == 0) &&
338 (dma_auto_mode & (1 << chan)) == 0 )
339 printf("isa_dmadone: channel %d not busy\n", chan);
340
341 if ((dma_auto_mode & (1 << chan)) == 0)
342 outb(chan & 4 ? DMA2_SMSK : DMA1_SMSK, (chan & 3) | 4);
343
344 if (dma_bounced & (1 << chan)) {
345 /* copy bounce buffer on read */
346 if (flags & ISADMA_READ)
347 bcopy(dma_bouncebuf[chan], addr, nbytes);
348
349 dma_bounced &= ~(1 << chan);
350 }
351 dma_busy &= ~(1 << chan);
371 if (((dma_busy & (1 << chan)) == 0) &&
372 (dma_auto_mode & (1 << chan)) == 0 )
373 printf("isa_dmadone: channel %d not busy\n", chan);
374
375 if ((dma_auto_mode & (1 << chan)) == 0)
376 outb(chan & 4 ? DMA2_SMSK : DMA1_SMSK, (chan & 3) | 4);
377
378 if (dma_bounced & (1 << chan)) {
379 /* copy bounce buffer on read */
380 if (flags & ISADMA_READ)
381 bcopy(dma_bouncebuf[chan], addr, nbytes);
382
383 dma_bounced &= ~(1 << chan);
384 }
385 dma_busy &= ~(1 << chan);
386 mtx_unlock(&isa_dma_lock);
352}
353
354/*
355 * Check for problems with the address range of a DMA transfer
356 * (non-contiguous physical pages, outside of bus address space,
357 * crossing DMA page boundaries).
358 * Return true if special handling needed.
359 */
360
361static int
362isa_dmarangecheck(caddr_t va, u_int length, int chan)
363{
364 vm_paddr_t phys, priorpage = 0;
365 vm_offset_t endva;
366 u_int dma_pgmsk = (chan & 4) ? ~(128*1024-1) : ~(64*1024-1);
367
387}
388
389/*
390 * Check for problems with the address range of a DMA transfer
391 * (non-contiguous physical pages, outside of bus address space,
392 * crossing DMA page boundaries).
393 * Return true if special handling needed.
394 */
395
396static int
397isa_dmarangecheck(caddr_t va, u_int length, int chan)
398{
399 vm_paddr_t phys, priorpage = 0;
400 vm_offset_t endva;
401 u_int dma_pgmsk = (chan & 4) ? ~(128*1024-1) : ~(64*1024-1);
402
368 GIANT_REQUIRED;
369
370 endva = (vm_offset_t)round_page((vm_offset_t)va + length);
371 for (; va < (caddr_t) endva ; va += PAGE_SIZE) {
372 phys = trunc_page(pmap_extract(kernel_pmap, (vm_offset_t)va));
373#define ISARAM_END RAM_END
374 if (phys == 0)
375 panic("isa_dmacheck: no physical page present");
376 if (phys >= ISARAM_END)
377 return (1);

--- 36 unchanged lines hidden (view full) ---

414 * corresponding pair.
415 *
416 * In any other case, low1 and high1 can be considered to be correct.
417 *
418 * The function returns the number of bytes remaining in the transfer,
419 * or -1 if the channel requested is not active.
420 *
421 */
403 endva = (vm_offset_t)round_page((vm_offset_t)va + length);
404 for (; va < (caddr_t) endva ; va += PAGE_SIZE) {
405 phys = trunc_page(pmap_extract(kernel_pmap, (vm_offset_t)va));
406#define ISARAM_END RAM_END
407 if (phys == 0)
408 panic("isa_dmacheck: no physical page present");
409 if (phys >= ISARAM_END)
410 return (1);

--- 36 unchanged lines hidden (view full) ---

447 * corresponding pair.
448 *
449 * In any other case, low1 and high1 can be considered to be correct.
450 *
451 * The function returns the number of bytes remaining in the transfer,
452 * or -1 if the channel requested is not active.
453 *
454 */
422int
423isa_dmastatus(int chan)
455static int
456isa_dmastatus_locked(int chan)
424{
425 u_long cnt = 0;
426 int ffport, waport;
427 u_long low1, high1, low2, high2;
428
457{
458 u_long cnt = 0;
459 int ffport, waport;
460 u_long low1, high1, low2, high2;
461
462 mtx_assert(&isa_dma_lock, MA_OWNED);
463
429 /* channel active? */
430 if ((dma_inuse & (1 << chan)) == 0) {
431 printf("isa_dmastatus: channel %d not active\n", chan);
432 return(-1);
433 }
434 /* channel busy? */
435
436 if (((dma_busy & (1 << chan)) == 0) &&

--- 29 unchanged lines hidden (view full) ---

466 cnt = (low2 + (high2 << 8) + 1) & 0xffff;
467 }
468
469 if (chan >= 4) /* high channels move words */
470 cnt *= 2;
471 return(cnt);
472}
473
464 /* channel active? */
465 if ((dma_inuse & (1 << chan)) == 0) {
466 printf("isa_dmastatus: channel %d not active\n", chan);
467 return(-1);
468 }
469 /* channel busy? */
470
471 if (((dma_busy & (1 << chan)) == 0) &&

--- 29 unchanged lines hidden (view full) ---

501 cnt = (low2 + (high2 << 8) + 1) & 0xffff;
502 }
503
504 if (chan >= 4) /* high channels move words */
505 cnt *= 2;
506 return(cnt);
507}
508
509int
510isa_dmastatus(int chan)
511{
512 int status;
513
514 mtx_lock(&isa_dma_lock);
515 status = isa_dmastatus_locked(chan);
516 mtx_unlock(&isa_dma_lock);
517
518 return (status);
519}
520
474/*
475 * Reached terminal count yet ?
476 */
477int
478isa_dmatc(int chan)
479{
480
481 if (chan < 4)
482 return(inb(DMA1_STATUS) & (1 << chan));
483 else
484 return(inb(DMA2_STATUS) & (1 << (chan & 3)));
485}
486
487/*
488 * Stop a DMA transfer currently in progress.
489 */
490int
491isa_dmastop(int chan)
492{
521/*
522 * Reached terminal count yet ?
523 */
524int
525isa_dmatc(int chan)
526{
527
528 if (chan < 4)
529 return(inb(DMA1_STATUS) & (1 << chan));
530 else
531 return(inb(DMA2_STATUS) & (1 << (chan & 3)));
532}
533
534/*
535 * Stop a DMA transfer currently in progress.
536 */
537int
538isa_dmastop(int chan)
539{
540 int status;
541
542 mtx_lock(&isa_dma_lock);
493 if ((dma_inuse & (1 << chan)) == 0)
494 printf("isa_dmastop: channel %d not acquired\n", chan);
495
496 if (((dma_busy & (1 << chan)) == 0) &&
497 ((dma_auto_mode & (1 << chan)) == 0)) {
498 printf("chan %d not busy\n", chan);
543 if ((dma_inuse & (1 << chan)) == 0)
544 printf("isa_dmastop: channel %d not acquired\n", chan);
545
546 if (((dma_busy & (1 << chan)) == 0) &&
547 ((dma_auto_mode & (1 << chan)) == 0)) {
548 printf("chan %d not busy\n", chan);
549 mtx_unlock(&isa_dma_lock);
499 return -2 ;
500 }
501
502 if ((chan & 4) == 0) {
503 outb(DMA1_SMSK, (chan & 3) | 4 /* disable mask */);
504 } else {
505 outb(DMA2_SMSK, (chan & 3) | 4 /* disable mask */);
506 }
550 return -2 ;
551 }
552
553 if ((chan & 4) == 0) {
554 outb(DMA1_SMSK, (chan & 3) | 4 /* disable mask */);
555 } else {
556 outb(DMA2_SMSK, (chan & 3) | 4 /* disable mask */);
557 }
507 return(isa_dmastatus(chan));
558
559 status = isa_dmastatus_locked(chan);
560
561 mtx_unlock(&isa_dma_lock);
562
563 return (status);
508}
509
510/*
511 * Attach to the ISA PnP descriptor for the AT DMA controller
512 */
513static struct isa_pnp_id atdma_ids[] = {
514 { 0x0002d041 /* PNP0200 */, "AT DMA controller" },
515 { 0 }

--- 39 unchanged lines hidden --- 		564}
565
566/*
567 * Attach to the ISA PnP descriptor for the AT DMA controller
568 */
569static struct isa_pnp_id atdma_ids[] = {
570 { 0x0002d041 /* PNP0200 */, "AT DMA controller" },
571 { 0 }

--- 39 unchanged lines hidden ---