Date: Thu, 8 Oct 1998 09:45:50 -0400 (EDT) From: "Larry S. Lile" <lile@stdio.com> To: hackers@FreeBSD.ORG Subject: DMA questions Message-ID: <Pine.SUN.3.91.981008093527.20081B-100000@heathers.stdio.com>
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I am working on a driver for Olicom token-ring cards and using the
Linux driver as a guideline but I am unsure about the dma commands
they are using. Any ideas on how to replicate this under FreeBSD?
Also is
there any good reference for dma under FreeBSD I can't seem to find much?
dmachan = oi->config->dmalevel;
if ((dmachan != TRLLD_DMA_PIO) &&
(dmachan != TRLLD_DMA_MASTER)) {
if (request_dma (dmachan, "oltr")) {
dprintk (KERN_INFO "%s: Couldn't grab DMA%d for this card.\n",
dev->name, dmachan);
return -EAGAIN;
oi->flags |= OLTR_GOT_DMA; }
/* I haven't the foggiest what "mode 0xc0" means. The SCO and DOS
drivers do similar things... */
> clear_dma_ff(dmachan); < This is what I am confused
> set_dma_count (dmachan, 0); < about...
> set_dma_mode (dmachan, 0xc0); <
> enable_dma (dmachan); <
}
Thanks in adavance
Larry Lile
lile@stdio.com
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