NetBSD/sys/arch/x68k/dev/dma.c

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1996-05-05 16:17:03 +04:00
/* $NetBSD: dma.c,v 1.1.1.1 1996/05/05 12:17:03 oki Exp $ */
/*-
* Copyright (c) 1993, 1994 Charles Hannum.
* Copyright (c) 1990 The Regents of the University of California.
* All rights reserved.
*
* This code is derived from software contributed to Berkeley by
* Don Ahn.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the University of
* California, Berkeley and its contributors.
* 4. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/file.h>
#include <sys/buf.h>
#include <sys/syslog.h>
#include <sys/malloc.h>
#include <sys/uio.h>
#include <vm/vm.h>
#include <machine/cpu.h>
#include <x68k/x68k/iodevice.h>
#include <x68k/dev/dmavar.h>
#define NDMA 4
/* region of physical memory known to be contiguous */
caddr_t dma_dataaddr[NDMA];
caddr_t dma_bouncebuf[NDMA];
vm_size_t dma_bouncebytes[NDMA];
char dma_bounced[NDMA];
/*
* Check for problems with the address range of a DMA transfer
* (non-contiguous physical pages, outside of bus address space,
* crossing DMA page boundaries).
* Return true if special handling needed.
*/
int
dmarangecheck(va, length)
vm_offset_t va;
u_long length;
{
vm_offset_t phys, priorpage = 0, endva;
u_int dma_pgmsk = ~PGOFSET;
endva = round_page(va + length);
for (; va < endva ; va += NBPG) {
phys = trunc_page(pmap_extract(pmap_kernel(), va));
if (phys == 0)
panic("dmacheck: no physical page present");
if (phys >= (1<<24))
return 1; /* XXX */
if (priorpage) {
if (priorpage + NBPG != phys)
return 1;
/* check if crossing a DMA page boundary */
if ((priorpage ^ phys) & dma_pgmsk)
return 1;
}
priorpage = phys;
}
return 0;
}
/*
* program HD63450 DMAC channel.
*/
void
x68k_dmastart(flag, addr, nbytes, chan)
int flag;
caddr_t addr;
int nbytes;
int chan;
{
volatile struct dmac *dmac = &IODEVbase->io_dma[chan];
if (dmarangecheck((vm_offset_t)addr, nbytes)) {
dma_bouncebytes[chan] = nbytes;
dma_dataaddr[chan] = addr;
if (!(flag)) {
bcopy(addr, dma_bouncebuf[chan], nbytes);
dma_bounced[chan] = DMA_BWR;
} else {
dma_bounced[chan] = DMA_BRD;
}
addr = dma_bouncebuf[chan];
} else {
dma_bounced[chan] = 0;
}
dmac->csr = 0xff;
dmac->ocr = flag ? 0xb2 : 0x32;
dmac->mtc = (unsigned short)nbytes;
asm("nop");
asm("nop");
dmac->mar = (unsigned long)kvtop(addr);
#if defined(M68040)
/*
* Push back dirty cache lines
*/
if (mmutype == MMU_68040)
DCFP(kvtop(addr));
#endif
dmac->ccr = 0x88;
}
#if 0
void
isa_dmadone(flags, addr, nbytes, chan)
int flags;
caddr_t addr;
vm_size_t nbytes;
int chan;
{
u_char tc;
#ifdef DIAGNOSTIC
if (chan < 0 || chan > 7)
panic("isa_dmadone: impossible request");
#endif
/* check that the terminal count was reached */
if ((chan & 4) == 0)
tc = inb(DMA1_SR) & (1 << chan);
else
tc = inb(DMA2_SR) & (1 << (chan & 3));
if (tc == 0)
/* XXX probably should panic or something */
log(LOG_ERR, "dma channel %d not finished\n", chan);
/* copy bounce buffer on read */
if (dma_bounced[chan]) {
bcopy(dma_bounce[chan], addr, nbytes);
dma_bounced[chan] = 0;
}
/* mask channel */
if ((chan & 4) == 0)
outb(DMA1_SMSK, DMA37SM_SET | chan);
else
outb(DMA2_SMSK, DMA37SM_SET | (chan & 3));
}
/* head of queue waiting for physmem to become available */
struct buf isa_physmemq;
/* blocked waiting for resource to become free for exclusive use */
static isaphysmemflag;
/* if waited for and call requested when free (B_CALL) */
static void (*isaphysmemunblock)(); /* needs to be a list */
/*
* Allocate contiguous physical memory for transfer, returning
* a *virtual* address to region. May block waiting for resource.
* (assumed to be called at splbio())
*/
caddr_t
isa_allocphysmem(caddr_t va, unsigned length, void (*func)()) {
isaphysmemunblock = func;
while (isaphysmemflag & B_BUSY) {
isaphysmemflag |= B_WANTED;
sleep((caddr_t)&isaphysmemflag, PRIBIO);
}
isaphysmemflag |= B_BUSY;
return((caddr_t)isaphysmem);
}
/*
* Free contiguous physical memory used for transfer.
* (assumed to be called at splbio())
*/
void
isa_freephysmem(caddr_t va, unsigned length) {
isaphysmemflag &= ~B_BUSY;
if (isaphysmemflag & B_WANTED) {
isaphysmemflag &= B_WANTED;
wakeup((caddr_t)&isaphysmemflag);
if (isaphysmemunblock)
(*isaphysmemunblock)();
}
}
#endif