dvma.c
2.73 KB
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/* dvma.c: Routines that are used to access DMA on the Sparc SBus.
*
* Copyright (C) 1995 David S. Miller (davem@caip.rutgers.edu)
*/
#include <linux/string.h>
#include <linux/kernel.h>
#include <linux/slab.h>
#include <linux/init.h>
#include <linux/delay.h>
#include <asm/oplib.h>
#include <asm/io.h>
#include <asm/dma.h>
#include <asm/sbus.h>
struct sbus_dma *dma_chain;
void __init init_one_dvma(struct sbus_dma *dma, int num_dma)
{
printk("dma%d: ", num_dma);
dma->next = NULL;
dma->running = 0; /* No transfers going on as of yet */
dma->allocated = 0; /* No one has allocated us yet */
switch(sbus_readl(dma->regs + DMA_CSR)&DMA_DEVICE_ID) {
case DMA_VERS0:
dma->revision = dvmarev0;
printk("Revision 0 ");
break;
case DMA_ESCV1:
dma->revision = dvmaesc1;
printk("ESC Revision 1 ");
break;
case DMA_VERS1:
dma->revision = dvmarev1;
printk("Revision 1 ");
break;
case DMA_VERS2:
dma->revision = dvmarev2;
printk("Revision 2 ");
break;
case DMA_VERHME:
dma->revision = dvmahme;
printk("HME DVMA gate array ");
break;
case DMA_VERSPLUS:
dma->revision = dvmarevplus;
printk("Revision 1 PLUS ");
break;
default:
printk("unknown dma version %08x",
sbus_readl(dma->regs + DMA_CSR) & DMA_DEVICE_ID);
dma->allocated = 1;
break;
}
printk("\n");
}
/* Probe this SBus DMA module(s) */
void __init dvma_init(struct sbus_bus *sbus)
{
struct sbus_dev *this_dev;
struct sbus_dma *dma;
struct sbus_dma *dchain;
static int num_dma = 0;
for_each_sbusdev(this_dev, sbus) {
char *name = this_dev->prom_name;
int hme = 0;
if(!strcmp(name, "SUNW,fas"))
hme = 1;
else if(strcmp(name, "dma") &&
strcmp(name, "ledma") &&
strcmp(name, "espdma"))
continue;
/* Found one... */
dma = kmalloc(sizeof(struct sbus_dma), GFP_ATOMIC);
dma->sdev = this_dev;
/* Put at end of dma chain */
dchain = dma_chain;
if(dchain) {
while(dchain->next)
dchain = dchain->next;
dchain->next = dma;
} else {
/* We're the first in line */
dma_chain = dma;
}
dma->regs = sbus_ioremap(&dma->sdev->resource[0], 0,
dma->sdev->resource[0].end - dma->sdev->resource[0].start + 1,
"dma");
dma->node = dma->sdev->prom_node;
init_one_dvma(dma, num_dma++);
}
}
#ifdef CONFIG_SUN4
#include <asm/sun4paddr.h>
void __init sun4_dvma_init(void)
{
struct sbus_dma *dma;
struct resource r;
if(sun4_dma_physaddr) {
dma = kmalloc(sizeof(struct sbus_dma), GFP_ATOMIC);
/* No SBUS */
dma->sdev = NULL;
/* Only one DMA device */
dma_chain = dma;
memset(&r, 0, sizeof(r));
r.start = sun4_dma_physaddr;
dma->regs = sbus_ioremap(&r, 0, PAGE_SIZE, "dma");
/* No prom node */
dma->node = 0x0;
init_one_dvma(dma, 0);
} else {
dma_chain = NULL;
}
}
#endif