mirror of
https://github.com/torvalds/linux.git
synced 2024-11-18 10:01:43 +00:00
1da177e4c3
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
138 lines
2.8 KiB
C
138 lines
2.8 KiB
C
/* 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/config.h>
|
|
#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
|