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Better DMA allocator (thanks to Jason R. Thorpe).

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This commit is contained in:
marcus 2001-01-19 20:27:31 +00:00
parent 28899ce913
commit 8cd0ae534a
1 changed files with 55 additions and 3 deletions
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58
sys/arch/dreamcast/dev/maple/maple.c
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@ -1,4 +1,4 @@
/* $NetBSD: maple.c,v 1.1 2001/01/16 00:32:42 marcus Exp $ */
/* $NetBSD: maple.c,v 1.2 2001/01/19 20:27:31 marcus Exp $ */
/*
* Copyright (c) 2001 Marcus Comstedt
@ -72,6 +72,9 @@ static void maple_callout __P((void *));
static void maple_send_commands __P((struct maple_softc *));
static void maple_check_responses __P((struct maple_softc *));
int maple_alloc_dma __P((size_t, vaddr_t *, paddr_t *));
void maple_free_dma __P((paddr_t, size_t));
/*
* Global variables.
@ -347,6 +350,51 @@ maple_callout(ctx)
(void *)maple_callout, sc);
}
int
maple_alloc_dma(size, vap, pap)
size_t size;
vaddr_t *vap;
paddr_t *pap;
{
extern paddr_t avail_start, avail_end; /* from pmap.c */
struct pglist mlist;
vm_page_t m;
int error;
size = round_page(size);
TAILQ_INIT(&mlist);
error = uvm_pglistalloc(size, avail_start, avail_end - PAGE_SIZE,
0, 0, &mlist, 1, 0);
if (error)
return (error);
m = TAILQ_FIRST(&mlist);
*pap = VM_PAGE_TO_PHYS(m);
*vap = SH3_PHYS_TO_P2SEG(VM_PAGE_TO_PHYS(m));
return (0);
}
void
maple_free_dma(paddr, size)
paddr_t paddr;
size_t size;
{
struct pglist mlist;
vm_page_t m;
bus_addr_t addr;
TAILQ_INIT(&mlist);
for (addr = paddr; addr < paddr + size; addr += PAGE_SIZE) {
m = PHYS_TO_VM_PAGE(addr);
TAILQ_INSERT_TAIL(&mlist, m, pageq);
}
uvm_pglistfree(&mlist);
}
static void
mapleattach(parent, self, aux)
struct device *parent, *self;
@ -354,6 +402,7 @@ mapleattach(parent, self, aux)
{
struct maple_softc *sc;
vaddr_t dmabuffer;
paddr_t dmabuffer_phys;
u_int32_t *p;
int i, j;
@ -361,9 +410,12 @@ mapleattach(parent, self, aux)
printf("\n");
dmabuffer = uvm_km_alloc(phys_map, MAPLE_DMABUF_SIZE);
if (maple_alloc_dma(MAPLE_DMABUF_SIZE, &dmabuffer, &dmabuffer_phys)) {
printf("%s: unable to allocate DMA buffers.\n", sc->sc_dev.dv_xname);
return;
}
p = (u_int32_t *) vtophys(dmabuffer);
p = (u_int32_t *) dmabuffer;
for (i = 0; i < MAPLE_PORTS; i++)
for (j = 0; j < MAPLE_SUBUNITS; j++) {