pc98/cbus/cbus_dma.c

67 static int isa_dmarangecheck(caddr_t va, u_int length, int chan);
87 isa_dma_init(int chan, u_int bouncebufsize, int flag)
92 	if (chan & ~VALID_DMA_MASK)
94 	if (dma_bouncebuf[chan] != NULL)
102 		if (isa_dmarangecheck(buf, bouncebufsize, chan) != 0) {
110 			   1ul, chan & 4 ? 0x20000ul : 0x10000ul);
118 	dma_bouncebufsize[chan] = bouncebufsize;
119 	dma_bouncebuf[chan] = buf;
131 isa_dma_acquire(chan)
132 	int chan;
135 	if (chan & ~VALID_DMA_MASK)
140 	if (dma_inuse & (1 << chan)) {
141 		printf("isa_dma_acquire: channel %d already in use\n", chan);
145 	dma_inuse |= (1 << chan);
146 	dma_auto_mode &= ~(1 << chan);
157 isa_dma_release(chan)
158 	int chan;
161 	if (chan & ~VALID_DMA_MASK)
165 	if ((dma_inuse & (1 << chan)) == 0)
166 		printf("isa_dma_release: channel %d not in use\n", chan);
171 	if (dma_busy & (1 << chan)) {
172 		dma_busy &= ~(1 << chan);
174 		 * XXX We should also do "dma_bounced &= (1 << chan);"
181 	dma_inuse &= ~(1 << chan);
182 	dma_auto_mode &= ~(1 << chan);
192 isa_dmastart(int flags, caddr_t addr, u_int nbytes, int chan)
201 	dma_range_checked = isa_dmarangecheck(addr, nbytes, chan);
204 	if (chan & ~VALID_DMA_MASK)
207 	if ((chan < 4 && nbytes > (1<<16))
208 	    || (chan >= 4 && (nbytes > (1<<17) || (u_int)addr & 1)))
212 	if ((dma_inuse & (1 << chan)) == 0)
213 		printf("isa_dmastart: channel %d not acquired\n", chan);
224 	if (dma_busy & (1 << chan))
225 		printf("isa_dmastart: channel %d busy\n", chan);
228 	dma_busy |= (1 << chan);
231 		if (dma_bouncebuf[chan] == NULL
232 		    || dma_bouncebufsize[chan] < nbytes)
234 		dma_bounced |= (1 << chan);
235 		newaddr = dma_bouncebuf[chan];
244 	    dma_auto_mode |= (1 << chan);
246 	    dma_auto_mode &= ~(1 << chan);
257 			outb(DMA1_MODE, DMA37MD_AUTO|DMA37MD_WRITE|chan);
259 			outb(DMA1_MODE, DMA37MD_AUTO|DMA37MD_READ|chan);
262 			outb(DMA1_MODE, DMA37MD_SINGLE|DMA37MD_WRITE|chan);
264 			outb(DMA1_MODE, DMA37MD_SINGLE|DMA37MD_READ|chan);
269 	waport =  DMA1_CHN(chan);
272 	outb(dmapageport[chan], phys>>16);
279 	outb(DMA1_SMSK, chan);
285 isa_dmadone(int flags, caddr_t addr, int nbytes, int chan)
295 	if (chan & ~VALID_DMA_MASK)
298 	if ((dma_inuse & (1 << chan)) == 0)
299 		printf("isa_dmadone: channel %d not acquired\n", chan);
303 	if (((dma_busy & (1 << chan)) == 0) &&
304 	    (dma_auto_mode & (1 << chan)) == 0 )
305 		printf("isa_dmadone: channel %d not busy\n", chan);
307 	if ((dma_auto_mode & (1 << chan)) == 0)
308 		outb(DMA1_SMSK, (chan & 3) | 4);
310 	if (dma_bounced & (1 << chan)) {
313 			bcopy(dma_bouncebuf[chan], addr, nbytes);
315 		dma_bounced &= ~(1 << chan);
317 	dma_busy &= ~(1 << chan);
329 isa_dmarangecheck(caddr_t va, u_int length, int chan)
333 	u_int dma_pgmsk = (chan & 4) ?  ~(128*1024-1) : ~(64*1024-1);
392 isa_dmastatus_locked(int chan)
401 	if ((dma_inuse & (1 << chan)) == 0) {
402 		printf("isa_dmastatus: channel %d not active\n", chan);
407 	if (((dma_busy & (1 << chan)) == 0) &&
408 	    (dma_auto_mode & (1 << chan)) == 0 ) {
409 	    printf("chan %d not busy\n", chan);
413 	waport = DMA1_CHN(chan) + 2;
435 	if (chan >= 4)			/* high channels move words */
441 isa_dmastatus(int chan)
446 	status = isa_dmastatus_locked(chan);
456 isa_dmatc(int chan)
459 	return(inb(DMA1_STATUS) & (1 << chan));
466 isa_dmastop(int chan)
471 	if ((dma_inuse & (1 << chan)) == 0)
472 		printf("isa_dmastop: channel %d not acquired\n", chan);
474 	if (((dma_busy & (1 << chan)) == 0) &&
475 	    ((dma_auto_mode & (1 << chan)) == 0)) {
476 		printf("chan %d not busy\n", chan);
481 	if ((chan & 4) == 0)
482 		outb(DMA1_SMSK, (chan & 3) | 4 /* disable mask */);
484 	status = isa_dmastatus_locked(chan);