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Add a lock for DMA Channels to prevent two devices from using the same DMA
channel at the same time. The functions isa_dma_acquire() and isa_dma_release() should be used in all ISA drivers which call isa_dmastart(). This can be used more generally to register the usage of DMA channels in any driver, but it is required for drivers using isa_dmastart() and friends. Clean up sanity checks, error messages, etc. Remove isa_dmadone_nobounce(), it is no longer needed Reviewed by: bde
This commit is contained in:
Sujal Patel
parent
dadd5f3a95
commit
1dce4e5d60
Notes:
svn2git
2020-12-20 02:59:44 +00:00
svn path=/head/; revision=15147
3 changed files with 230 additions and 94 deletions
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@ -34,7 +34,7 @@
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* SUCH DAMAGE.
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*
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* from: @(#)isa.c 7.2 (Berkeley) 5/13/91
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* $Id: isa.c,v 1.65 1996/03/10 07:04:44 gibbs Exp $
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* $Id: isa.c,v 1.66 1996/04/07 17:32:13 bde Exp $
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*/
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/*
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@ -125,7 +125,7 @@ static void conflict __P((struct isa_device *dvp, struct isa_device *tmpdvp,
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char const *format));
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static int haveseen __P((struct isa_device *dvp, struct isa_device *tmpdvp,
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u_int checkbits));
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static int isa_dmarangecheck __P((caddr_t va, unsigned length, unsigned chan));
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static int isa_dmarangecheck __P((caddr_t va, u_int length, int chan));
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static inthand2_t isa_strayintr;
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static void register_imask __P((struct isa_device *dvp, u_int mask));
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@ -559,26 +559,35 @@ isa_defaultirq()
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}
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static caddr_t dma_bouncebuf[8];
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static unsigned dma_bouncebufsize[8];
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static char dma_bounced[8];
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static char dma_busy[8];
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static u_int dma_bouncebufsize[8];
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static u_int8_t dma_bounced = 0;
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static u_int8_t dma_busy = 0; /* Used in isa_dmastart() */
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static u_int8_t dma_inuse = 0; /* User for acquire/release */
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#define VALID_DMA_MASK (7)
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/* high byte of address is stored in this port for i-th dma channel */
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static short dmapageport[8] =
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{ 0x87, 0x83, 0x81, 0x82, 0x8f, 0x8b, 0x89, 0x8a };
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/*
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* Allocate a DMA channel.
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* Setup a DMA channel's bounce buffer.
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*/
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void
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isa_dmainit(chan, bouncebufsize)
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unsigned chan;
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unsigned bouncebufsize;
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int chan;
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u_int bouncebufsize;
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{
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void *buf;
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if (chan > 7 || dma_bouncebuf[chan] != NULL)
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#ifdef DIAGNOSTIC
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if (chan & ~VALID_DMA_MASK)
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panic("isa_dmainit: channel out of range");
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if (dma_bouncebuf[chan] != NULL)
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panic("isa_dmainit: impossible request");
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#endif
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dma_bouncebufsize[chan] = bouncebufsize;
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/* Try malloc() first. It works better if it works. */
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@ -598,14 +607,68 @@ isa_dmainit(chan, bouncebufsize)
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dma_bouncebuf[chan] = buf;
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}
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/*
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* Register a DMA channel's usage. Usually called from a device driver
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* in open() or during it's initialization.
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*/
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int
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isa_dma_acquire(chan)
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int chan;
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{
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#ifdef DIAGNOSTIC
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if (chan & ~VALID_DMA_MASK)
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panic("isa_dma_acquire: channel out of range");
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#endif
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if (dma_inuse & (1 << chan)) {
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printf("isa_dma_acquire: channel %d already in use\n", chan);
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return (EBUSY);
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}
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dma_inuse |= (1 << chan);
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return (0);
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}
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/*
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* Unregister a DMA channel's usage. Usually called from a device driver
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* during close() or during it's shutdown.
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*/
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void
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isa_dma_release(chan)
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int chan;
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{
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#ifdef DIAGNOSTIC
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if (chan & ~VALID_DMA_MASK)
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panic("isa_dma_release: channel out of range");
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if (dma_inuse & (1 << chan) == 0)
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printf("isa_dma_release: channel %d not in use\n", chan);
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#endif
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if (dma_busy & (1 << chan)) {
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dma_busy &= ~(1 << chan);
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/*
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* XXX We should also do "dma_bounced &= (1 << chan);"
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* because we are acting on behalf of isa_dmadone() which
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* was not called to end the last DMA operation. This does
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* not matter now, but it may in the future.
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*/
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}
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dma_inuse &= ~(1 << chan);
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}
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/*
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* isa_dmacascade(): program 8237 DMA controller channel to accept
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* external dma control by a board.
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*/
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void isa_dmacascade(unsigned chan)
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void isa_dmacascade(chan)
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int chan;
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{
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if (chan > 7)
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panic("isa_dmacascade: impossible request");
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#ifdef DIAGNOSTIC
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if (chan & ~VALID_DMA_MASK)
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panic("isa_dmacascade: channel out of range");
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#endif
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/* set dma channel mode, and set dma channel mode */
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if ((chan & 4) == 0) {
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@ -621,26 +684,34 @@ void isa_dmacascade(unsigned chan)
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* isa_dmastart(): program 8237 DMA controller channel, avoid page alignment
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* problems by using a bounce buffer.
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*/
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void isa_dmastart(int flags, caddr_t addr, unsigned nbytes, unsigned chan)
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{ vm_offset_t phys;
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void isa_dmastart(int flags, caddr_t addr, u_int nbytes, int chan)
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{
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vm_offset_t phys;
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int waport;
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caddr_t newaddr;
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if ( chan > 7
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|| (chan < 4 && nbytes > (1<<16))
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#ifdef DIAGNOSTIC
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if (chan & ~VALID_DMA_MASK)
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panic("isa_dmastart: channel out of range");
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if ((chan < 4 && nbytes > (1<<16))
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|| (chan >= 4 && (nbytes > (1<<17) || (u_int)addr & 1)))
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panic("isa_dmastart: impossible request");
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#ifdef notdef
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if (dma_busy[chan])
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printf("isa_dmastart: channel %u busy\n", chan);
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if (dma_inuse & (1 << chan) == 0)
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printf("isa_dmastart: channel %d not acquired\n", chan);
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#endif
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dma_busy[chan] = 1;
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if (dma_busy & (1 << chan))
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printf("isa_dmastart: channel %d busy\n", chan);
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dma_busy |= (1 << chan);
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if (isa_dmarangecheck(addr, nbytes, chan)) {
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if (dma_bouncebuf[chan] == NULL
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|| dma_bouncebufsize[chan] < nbytes)
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panic("isa_dmastart: bad bounce buffer");
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dma_bounced[chan] = 1;
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dma_bounced |= (1 << chan);
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newaddr = dma_bouncebuf[chan];
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/* copy bounce buffer on write */
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@ -723,36 +794,33 @@ void isa_dmastart(int flags, caddr_t addr, unsigned nbytes, unsigned chan)
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}
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void isa_dmadone(int flags, caddr_t addr, int nbytes, int chan)
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{
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{
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#ifdef DIAGNOSTIC
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if (chan & ~VALID_DMA_MASK)
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panic("isa_dmadone: channel out of range");
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#ifdef notdef
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if (!dma_busy[chan])
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if (dma_inuse & (1 << chan) == 0)
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printf("isa_dmadone: channel %d not acquired\n", chan);
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#endif
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#if 0
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/*
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* XXX This should be checked, but drivers like ad1848 only call
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* isa_dmastart() once because they use Auto DMA mode. If we
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* leave this in, drivers that do this will print this continuously.
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*/
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if (dma_busy & (1 << chan) == 0)
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printf("isa_dmadone: channel %d not busy\n", chan);
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#endif
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if (dma_bounced[chan]) {
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if (dma_bounced & (1 << chan)) {
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/* copy bounce buffer on read */
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if (flags & B_READ)
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bcopy(dma_bouncebuf[chan], addr, nbytes);
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dma_bounced[chan] = 0;
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dma_bounced &= ~(1 << chan);
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}
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dma_busy[chan] = 0;
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}
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void
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isa_dmadone_nobounce(chan)
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unsigned chan;
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{
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#ifdef notdef
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if (!dma_busy[chan])
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printf("isa_dmadone_nobounce: channel %u not busy\n", chan);
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#endif
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if (dma_bounced[chan]) {
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printf("isa_dmadone_nobounce: channel %u bounced\n", chan);
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dma_bounced[chan] = 0;
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}
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dma_busy[chan] = 0;
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dma_busy &= ~(1 << chan);
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}
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/*
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@ -763,7 +831,7 @@ isa_dmadone_nobounce(chan)
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*/
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static int
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isa_dmarangecheck(caddr_t va, unsigned length, unsigned chan) {
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isa_dmarangecheck(caddr_t va, u_int length, int chan) {
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vm_offset_t phys, priorpage = 0, endva;
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u_int dma_pgmsk = (chan & 4) ? ~(128*1024-1) : ~(64*1024-1);
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@ -34,7 +34,7 @@
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* SUCH DAMAGE.
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*
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* from: @(#)isa.c 7.2 (Berkeley) 5/13/91
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* $Id: isa.c,v 1.65 1996/03/10 07:04:44 gibbs Exp $
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* $Id: isa.c,v 1.66 1996/04/07 17:32:13 bde Exp $
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*/
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/*
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@ -125,7 +125,7 @@ static void conflict __P((struct isa_device *dvp, struct isa_device *tmpdvp,
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char const *format));
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static int haveseen __P((struct isa_device *dvp, struct isa_device *tmpdvp,
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u_int checkbits));
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static int isa_dmarangecheck __P((caddr_t va, unsigned length, unsigned chan));
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static int isa_dmarangecheck __P((caddr_t va, u_int length, int chan));
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static inthand2_t isa_strayintr;
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static void register_imask __P((struct isa_device *dvp, u_int mask));
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@ -559,26 +559,35 @@ isa_defaultirq()
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}
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static caddr_t dma_bouncebuf[8];
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static unsigned dma_bouncebufsize[8];
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static char dma_bounced[8];
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static char dma_busy[8];
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static u_int dma_bouncebufsize[8];
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static u_int8_t dma_bounced = 0;
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static u_int8_t dma_busy = 0; /* Used in isa_dmastart() */
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static u_int8_t dma_inuse = 0; /* User for acquire/release */
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#define VALID_DMA_MASK (7)
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/* high byte of address is stored in this port for i-th dma channel */
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static short dmapageport[8] =
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{ 0x87, 0x83, 0x81, 0x82, 0x8f, 0x8b, 0x89, 0x8a };
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/*
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* Allocate a DMA channel.
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* Setup a DMA channel's bounce buffer.
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*/
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void
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isa_dmainit(chan, bouncebufsize)
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unsigned chan;
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unsigned bouncebufsize;
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int chan;
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u_int bouncebufsize;
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{
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void *buf;
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if (chan > 7 || dma_bouncebuf[chan] != NULL)
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#ifdef DIAGNOSTIC
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if (chan & ~VALID_DMA_MASK)
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panic("isa_dmainit: channel out of range");
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if (dma_bouncebuf[chan] != NULL)
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panic("isa_dmainit: impossible request");
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#endif
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dma_bouncebufsize[chan] = bouncebufsize;
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/* Try malloc() first. It works better if it works. */
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@ -598,14 +607,68 @@ isa_dmainit(chan, bouncebufsize)
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dma_bouncebuf[chan] = buf;
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}
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/*
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* Register a DMA channel's usage. Usually called from a device driver
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* in open() or during it's initialization.
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*/
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int
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isa_dma_acquire(chan)
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int chan;
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{
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#ifdef DIAGNOSTIC
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if (chan & ~VALID_DMA_MASK)
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panic("isa_dma_acquire: channel out of range");
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#endif
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if (dma_inuse & (1 << chan)) {
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printf("isa_dma_acquire: channel %d already in use\n", chan);
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return (EBUSY);
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}
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dma_inuse |= (1 << chan);
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return (0);
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}
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/*
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* Unregister a DMA channel's usage. Usually called from a device driver
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* during close() or during it's shutdown.
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*/
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void
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isa_dma_release(chan)
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int chan;
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{
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#ifdef DIAGNOSTIC
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if (chan & ~VALID_DMA_MASK)
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panic("isa_dma_release: channel out of range");
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if (dma_inuse & (1 << chan) == 0)
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printf("isa_dma_release: channel %d not in use\n", chan);
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#endif
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if (dma_busy & (1 << chan)) {
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dma_busy &= ~(1 << chan);
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/*
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* XXX We should also do "dma_bounced &= (1 << chan);"
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* because we are acting on behalf of isa_dmadone() which
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* was not called to end the last DMA operation. This does
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* not matter now, but it may in the future.
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*/
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}
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dma_inuse &= ~(1 << chan);
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}
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/*
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* isa_dmacascade(): program 8237 DMA controller channel to accept
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* external dma control by a board.
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*/
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void isa_dmacascade(unsigned chan)
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void isa_dmacascade(chan)
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int chan;
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{
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if (chan > 7)
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panic("isa_dmacascade: impossible request");
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#ifdef DIAGNOSTIC
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if (chan & ~VALID_DMA_MASK)
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panic("isa_dmacascade: channel out of range");
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#endif
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/* set dma channel mode, and set dma channel mode */
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if ((chan & 4) == 0) {
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|
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@ -621,26 +684,34 @@ void isa_dmacascade(unsigned chan)
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* isa_dmastart(): program 8237 DMA controller channel, avoid page alignment
|
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* problems by using a bounce buffer.
|
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*/
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void isa_dmastart(int flags, caddr_t addr, unsigned nbytes, unsigned chan)
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{ vm_offset_t phys;
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void isa_dmastart(int flags, caddr_t addr, u_int nbytes, int chan)
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{
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vm_offset_t phys;
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int waport;
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caddr_t newaddr;
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if ( chan > 7
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|| (chan < 4 && nbytes > (1<<16))
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#ifdef DIAGNOSTIC
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if (chan & ~VALID_DMA_MASK)
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panic("isa_dmastart: channel out of range");
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if ((chan < 4 && nbytes > (1<<16))
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|| (chan >= 4 && (nbytes > (1<<17) || (u_int)addr & 1)))
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panic("isa_dmastart: impossible request");
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#ifdef notdef
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if (dma_busy[chan])
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printf("isa_dmastart: channel %u busy\n", chan);
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if (dma_inuse & (1 << chan) == 0)
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printf("isa_dmastart: channel %d not acquired\n", chan);
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#endif
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dma_busy[chan] = 1;
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if (dma_busy & (1 << chan))
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printf("isa_dmastart: channel %d busy\n", chan);
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dma_busy |= (1 << chan);
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if (isa_dmarangecheck(addr, nbytes, chan)) {
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if (dma_bouncebuf[chan] == NULL
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|| dma_bouncebufsize[chan] < nbytes)
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panic("isa_dmastart: bad bounce buffer");
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dma_bounced[chan] = 1;
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dma_bounced |= (1 << chan);
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newaddr = dma_bouncebuf[chan];
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/* copy bounce buffer on write */
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|
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@ -723,36 +794,33 @@ void isa_dmastart(int flags, caddr_t addr, unsigned nbytes, unsigned chan)
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}
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void isa_dmadone(int flags, caddr_t addr, int nbytes, int chan)
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{
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{
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#ifdef DIAGNOSTIC
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if (chan & ~VALID_DMA_MASK)
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panic("isa_dmadone: channel out of range");
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#ifdef notdef
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if (!dma_busy[chan])
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if (dma_inuse & (1 << chan) == 0)
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printf("isa_dmadone: channel %d not acquired\n", chan);
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#endif
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#if 0
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/*
|
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* 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.
|
||||
*/
|
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if (dma_busy & (1 << chan) == 0)
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printf("isa_dmadone: channel %d not busy\n", chan);
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#endif
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if (dma_bounced[chan]) {
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if (dma_bounced & (1 << chan)) {
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/* copy bounce buffer on read */
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if (flags & B_READ)
|
||||
bcopy(dma_bouncebuf[chan], addr, nbytes);
|
||||
|
||||
dma_bounced[chan] = 0;
|
||||
dma_bounced &= ~(1 << chan);
|
||||
}
|
||||
dma_busy[chan] = 0;
|
||||
}
|
||||
|
||||
void
|
||||
isa_dmadone_nobounce(chan)
|
||||
unsigned chan;
|
||||
{
|
||||
|
||||
#ifdef notdef
|
||||
if (!dma_busy[chan])
|
||||
printf("isa_dmadone_nobounce: channel %u not busy\n", chan);
|
||||
#endif
|
||||
if (dma_bounced[chan]) {
|
||||
printf("isa_dmadone_nobounce: channel %u bounced\n", chan);
|
||||
dma_bounced[chan] = 0;
|
||||
}
|
||||
dma_busy[chan] = 0;
|
||||
dma_busy &= ~(1 << chan);
|
||||
}
|
||||
|
||||
/*
|
||||
|
|
@ -763,7 +831,7 @@ isa_dmadone_nobounce(chan)
|
|||
*/
|
||||
|
||||
static int
|
||||
isa_dmarangecheck(caddr_t va, unsigned length, unsigned chan) {
|
||||
isa_dmarangecheck(caddr_t va, u_int length, int chan) {
|
||||
vm_offset_t phys, priorpage = 0, endva;
|
||||
u_int dma_pgmsk = (chan & 4) ? ~(128*1024-1) : ~(64*1024-1);
|
||||
|
||||
|
|
|
|||
|
|
@ -31,7 +31,7 @@
|
|||
* SUCH DAMAGE.
|
||||
*
|
||||
* from: @(#)isa_device.h 7.1 (Berkeley) 5/9/91
|
||||
* $Id: isa_device.h,v 1.27 1996/01/27 01:57:02 bde Exp $
|
||||
* $Id: isa_device.h,v 1.28 1996/01/30 22:56:02 mpp Exp $
|
||||
*/
|
||||
|
||||
#ifndef _I386_ISA_ISA_DEVICE_H_
|
||||
|
|
@ -154,12 +154,12 @@ struct isa_device *
|
|||
int haveseen_isadev __P((struct isa_device *dvp, u_int checkbits));
|
||||
void isa_configure __P((void));
|
||||
void isa_defaultirq __P((void));
|
||||
void isa_dmacascade __P((unsigned chan));
|
||||
void isa_dmacascade __P((int chan));
|
||||
void isa_dmadone __P((int flags, caddr_t addr, int nbytes, int chan));
|
||||
void isa_dmadone_nobounce __P((unsigned chan));
|
||||
void isa_dmainit __P((unsigned chan, unsigned bouncebufsize));
|
||||
void isa_dmastart __P((int flags, caddr_t addr, unsigned nbytes,
|
||||
unsigned chan));
|
||||
void isa_dmainit __P((int chan, u_int bouncebufsize));
|
||||
void isa_dmastart __P((int flags, caddr_t addr, u_int nbytes, int chan));
|
||||
int isa_dma_acquire __P((int chan));
|
||||
void isa_dma_release __P((int chan));
|
||||
int isa_externalize __P((struct isa_device *id, struct sysctl_req *req));
|
||||
int isa_generic_externalize __P((struct kern_devconf *kdc,
|
||||
struct sysctl_req *req));
|
||||
|
|
|
|||
Loading…
Reference in a new issue