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Allocate the DMA channel shareable and only aquire it while the

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device is open.  This allows certain old and rather special dual
floppy controllers to work on both channels, as long as you only
have one open at a time.
This commit is contained in:
Poul-Henning Kamp 2004-07-05 20:56:06 +00:00
parent 91ea86d7e8
commit de0b7a6307
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=131648
1 changed files with 18 additions and 15 deletions
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33
sys/dev/fdc/fdc.c
View file

@ -132,6 +132,7 @@ struct fdc_data
{
int fdcu; /* our unit number */
int dmachan;
int dmacnt;
int flags;
#define FDC_ATTACHED 0x01
#define FDC_STAT_VALID 0x08
@ -770,7 +771,8 @@ fdc_alloc_resources(struct fdc_data *fdc)
}
fdc->res_irq = bus_alloc_resource_any(dev, SYS_RES_IRQ,
&fdc->rid_irq, RF_ACTIVE | RF_SHAREABLE);
&fdc->rid_irq,
RF_ACTIVE | RF_SHAREABLE);
if (fdc->res_irq == 0) {
device_printf(dev, "cannot reserve interrupt line\n");
return ENXIO;
@ -778,8 +780,7 @@ fdc_alloc_resources(struct fdc_data *fdc)
if ((fdc->flags & FDC_NODMA) == 0) {
fdc->res_drq = bus_alloc_resource_any(dev, SYS_RES_DRQ,
&fdc->rid_drq,
RF_ACTIVE);
&fdc->rid_drq, RF_ACTIVE | RF_SHAREABLE);
if (fdc->res_drq == 0) {
device_printf(dev, "cannot reserve DMA request line\n");
fdc->flags |= FDC_NODMA;
@ -964,9 +965,6 @@ fdc_detach(device_t dev)
/* reset controller, turn motor off */
fdout_wr(fdc, 0);
if ((fdc->flags & FDC_NODMA) == 0)
isa_dma_release(fdc->dmachan);
if ((fdc->flags & FDC_ATTACHED) == 0) {
device_printf(dev, "already unloaded\n");
return (0);
@ -1030,15 +1028,6 @@ fdc_attach(device_t dev)
fdc->fdcu = device_get_unit(dev);
fdc->flags |= FDC_ATTACHED | FDC_NEEDS_RESET;
if ((fdc->flags & FDC_NODMA) == 0) {
/*
* Acquire the DMA channel forever, the driver will do
* the rest
* XXX should integrate with rman
*/
isa_dma_acquire(fdc->dmachan);
isa_dmainit(fdc->dmachan, MAX_SEC_SIZE);
}
fdc->state = DEVIDLE;
/* reset controller, turn motor off, clear fdout mirror reg */
@ -1574,6 +1563,14 @@ fdopen(struct cdev *dev, int flags, int mode, struct thread *td)
return (rv);
}
fd->flags |= FD_OPEN;
if ((fdc->flags & FDC_NODMA) == 0) {
if (fdc->dmacnt++ == 0) {
isa_dma_acquire(fdc->dmachan);
isa_dmainit(fdc->dmachan, MAX_SEC_SIZE);
}
}
/*
* Clearing the DMA overrun counter at open time is a bit messy.
* Since we're only managing one counter per controller, opening
@ -1594,11 +1591,17 @@ static int
fdclose(struct cdev *dev, int flags, int mode, struct thread *td)
{
struct fd_data *fd;
fdc_p fdc;
fd = dev->si_drv1;
fdc = fd->fdc;
fd->flags &= ~(FD_OPEN | FD_NONBLOCK);
fd->options &= ~(FDOPT_NORETRY | FDOPT_NOERRLOG | FDOPT_NOERROR);
if ((fdc->flags & FDC_NODMA) == 0)
if (--fdc->dmacnt == 0)
isa_dma_release(fdc->dmachan);
return (0);
}