/*
* Setup a DMA channel's bounce buffer.
*/
void
isa_dmainit(int chan, u_int bouncebufsize)
{
void *buf;
#ifdef DIAGNOSTIC
if (chan & ~VALID_DMA_MASK)
panic("isa_dmainit: channel out of range");
if (dma_bouncebuf[chan] != NULL)
panic("isa_dmainit: impossible request");
#endif
dma_bouncebufsize[chan] = bouncebufsize;
/* Try malloc() first. It works better if it works. */
buf = kmalloc(bouncebufsize, M_DEVBUF, M_NOWAIT);
if (buf != NULL) {
if (isa_dmarangecheck(buf, bouncebufsize, chan) == 0) {
dma_bouncebuf[chan] = buf;
return;
}
kfree(buf, M_DEVBUF);
}
buf = contigmalloc(bouncebufsize, M_DEVBUF, M_NOWAIT, 0ul, 0xfffffful,
1ul, chan & 4 ? 0x20000ul : 0x10000ul);
if (buf == NULL)
kprintf("isa_dmainit(%d, %d) failed\n", chan, bouncebufsize);
else
dma_bouncebuf[chan] = buf;
}
/*
* Setup a DMA channel's bounce buffer.
*/
int
isa_dma_init(int chan, u_int bouncebufsize, int flag)
{
void *buf;
int contig;
#ifdef DIAGNOSTIC
if (chan & ~VALID_DMA_MASK)
panic("isa_dma_init: channel out of range");
#endif
/* Try malloc() first. It works better if it works. */
buf = malloc(bouncebufsize, M_DEVBUF, flag);
if (buf != NULL) {
if (isa_dmarangecheck(buf, bouncebufsize, chan) != 0) {
free(buf, M_DEVBUF);
buf = NULL;
}
contig = 0;
}
if (buf == NULL) {
buf = contigmalloc(bouncebufsize, M_DEVBUF, flag, 0ul, 0xfffffful,
1ul, chan & 4 ? 0x20000ul : 0x10000ul);
contig = 1;
}
if (buf == NULL)
return (ENOMEM);
mtx_lock(&isa_dma_lock);
/*
* If a DMA channel is shared, both drivers have to call isa_dma_init
* since they don't know that the other driver will do it.
* Just return if we're already set up good.
* XXX: this only works if they agree on the bouncebuf size. This
* XXX: is typically the case since they are multiple instances of
* XXX: the same driver.
*/
if (dma_bouncebuf[chan] != NULL) {
if (contig)
contigfree(buf, bouncebufsize, M_DEVBUF);
else
free(buf, M_DEVBUF);
mtx_unlock(&isa_dma_lock);
return (0);
}
dma_bouncebufsize[chan] = bouncebufsize;
dma_bouncebuf[chan] = buf;
mtx_unlock(&isa_dma_lock);
return (0);
}
/*
* Setup a DMA channel's bounce buffer.
*/
int
isa_dma_init(int chan, u_int bouncebufsize, int flag)
{
void *buf;
#ifdef DIAGNOSTIC
if (chan & ~VALID_DMA_MASK)
panic("isa_dma_init: channel out of range");
if (dma_bouncebuf[chan] != NULL)
panic("isa_dma_init: impossible request");
#endif
/* Try malloc() first. It works better if it works. */
buf = malloc(bouncebufsize, M_DEVBUF, flag);
if (buf != NULL) {
if (isa_dmarangecheck(buf, bouncebufsize, chan) != 0) {
free(buf, M_DEVBUF);
buf = NULL;
}
}
if (buf == NULL) {
buf = contigmalloc(bouncebufsize, M_DEVBUF, flag, 0ul, 0xfffffful,
1ul, chan & 4 ? 0x20000ul : 0x10000ul);
}
if (buf == NULL)
return (ENOMEM);
mtx_lock(&isa_dma_lock);
dma_bouncebufsize[chan] = bouncebufsize;
dma_bouncebuf[chan] = buf;
mtx_unlock(&isa_dma_lock);
return (0);
}
/*
* isa_dmastart(): program 8237 DMA controller channel, avoid page alignment
* problems by using a bounce buffer.
*/
void
isa_dmastart(int flags, caddr_t addr, u_int nbytes, int chan)
{
vm_paddr_t phys;
int waport;
caddr_t newaddr;
int dma_range_checked;
dma_range_checked = isa_dmarangecheck(addr, nbytes, chan);
#ifdef DIAGNOSTIC
if (chan & ~VALID_DMA_MASK)
panic("isa_dmastart: channel out of range");
if ((chan < 4 && nbytes > (1<<16))
|| (chan >= 4 && (nbytes > (1<<17) || (uintptr_t)addr & 1)))
panic("isa_dmastart: impossible request");
mtx_lock(&isa_dma_lock);
if ((dma_inuse & (1 << chan)) == 0)
printf("isa_dmastart: channel %d not acquired\n", chan);
#else
mtx_lock(&isa_dma_lock);
#endif
#if 0
/*
* XXX This should be checked, but drivers like ad1848 only call
* isa_dmastart() once because they use Auto DMA mode. If we
* leave this in, drivers that do this will print this continuously.
*/
if (dma_busy & (1 << chan))
printf("isa_dmastart: channel %d busy\n", chan);
#endif
dma_busy |= (1 << chan);
if (dma_range_checked) {
if (dma_bouncebuf[chan] == NULL
|| dma_bouncebufsize[chan] < nbytes)
panic("isa_dmastart: bad bounce buffer");
dma_bounced |= (1 << chan);
newaddr = dma_bouncebuf[chan];
/* copy bounce buffer on write */
if (!(flags & ISADMA_READ))
bcopy(addr, newaddr, nbytes);
addr = newaddr;
}
/* translate to physical */
phys = pmap_extract(kernel_pmap, (vm_offset_t)addr);
if (flags & ISADMA_RAW) {
dma_auto_mode |= (1 << chan);
} else {
dma_auto_mode &= ~(1 << chan);
}
if ((chan & 4) == 0) {
/*
* Program one of DMA channels 0..3. These are
* byte mode channels.
*/
/* set dma channel mode, and reset address ff */
/* If ISADMA_RAW flag is set, then use autoinitialise mode */
if (flags & ISADMA_RAW) {
if (flags & ISADMA_READ)
outb(DMA1_MODE, DMA37MD_AUTO|DMA37MD_WRITE|chan);
else
outb(DMA1_MODE, DMA37MD_AUTO|DMA37MD_READ|chan);
}
else
if (flags & ISADMA_READ)
outb(DMA1_MODE, DMA37MD_SINGLE|DMA37MD_WRITE|chan);
else
outb(DMA1_MODE, DMA37MD_SINGLE|DMA37MD_READ|chan);
outb(DMA1_FFC, 0);
/* send start address */
waport = DMA1_CHN(chan);
outb(waport, phys);
outb(waport, phys>>8);
outb(dmapageport[chan], phys>>16);
/* send count */
outb(waport + 1, --nbytes);
outb(waport + 1, nbytes>>8);
/* unmask channel */
outb(DMA1_SMSK, chan);
} else {
/*
* Program one of DMA channels 4..7. These are
* word mode channels.
*/
/* set dma channel mode, and reset address ff */
/* If ISADMA_RAW flag is set, then use autoinitialise mode */
if (flags & ISADMA_RAW) {
