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/*
* arch/arm/kernel/dma-arc.c
*
* Copyright (C) 1998 Dave Gilbert / Russell King
*
* DMA functions specific to Archimedes architecture
*/
#include <linux/sched.h>
#include <linux/init.h>
#include <asm/dma.h>
#include <asm/io.h>
#include <asm/hardware.h>
#include "dma.h"
int arch_request_dma(dmach_t channel, dma_t *dma)
{
if (channel == DMA_VIRTUAL_FLOPPY0 ||
channel == DMA_VIRTUAL_FLOPPY1)
return 0;
else
return -EINVAL;
}
void arch_free_dma(dmach_t channel, dma_t *dma)
{
if (channel != DMA_VIRTUAL_FLOPPY0 &&
channel != DMA_VIRTUAL_FLOPPY1)
return 0;
else
return -EINVAL;
}
void arch_enable_dma(dmach_t channel, dma_t *dma)
{
switch (channel) {
case DMA_VIRTUAL_FLOPPY0: { /* Data DMA */
switch (dma->dma_mode) {
case DMA_MODE_READ: /* read */
{
extern unsigned char fdc1772_dma_read, fdc1772_dma_read_end;
extern void fdc1772_setupdma(unsigned int count,unsigned int addr);
unsigned long flags;
#ifdef DEBUG
printk("enable_dma fdc1772 data read\n");
#endif
save_flags(flags);
cliIF();
memcpy ((void *)0x1c, (void *)&fdc1772_dma_read,
&fdc1772_dma_read_end - &fdc1772_dma_read);
fdc1772_setupdma(dma->buf.length, __bus_to_virt(dma->buf.address)); /* Sets data pointer up */
enable_irq (64);
restore_flags(flags);
}
break;
case DMA_MODE_WRITE: /* write */
{
extern unsigned char fdc1772_dma_write, fdc1772_dma_write_end;
extern void fdc1772_setupdma(unsigned int count,unsigned int addr);
unsigned long flags;
#ifdef DEBUG
printk("enable_dma fdc1772 data write\n");
#endif
save_flags(flags);
cliIF();
memcpy ((void *)0x1c, (void *)&fdc1772_dma_write,
&fdc1772_dma_write_end - &fdc1772_dma_write);
fdc1772_setupdma(dma->buf.length, __bus_to_virt(dma->buf.address)); /* Sets data pointer up */
enable_irq (64);
restore_flags(flags);
}
break;
default:
printk ("enable_dma: dma%d not initialised\n", channel);
return;
}
}
break;
case DMA_VIRTUAL_FLOPPY1: { /* Command end FIQ - actually just sets a flag */
/* Need to build a branch at the FIQ address */
extern void fdc1772_comendhandler(void);
unsigned long flags;
/*printk("enable_dma fdc1772 command end FIQ\n");*/
save_flags(flags);
cliIF();
*((unsigned int *)0x1c)=0xea000000 | (((unsigned int)fdc1772_comendhandler-(0x1c+8))/4); /* B fdc1772_comendhandler */
restore_flags(flags);
}
break;
}
}
void arch_disable_dma(dmach_t channel, dma_t *dma)
{
if (channel != DMA_VIRTUAL_FLOPPY0 &&
channel != DMA_VIRTUAL_FLOPPY1)
printk("arch_disable_dma: invalid channel %d\n", channel);
else
disable_irq(dma->dma_irq);
}
__initfunc(void arch_dma_init(dma_t *dma))
{
dma[DMA_VIRTUAL_FLOPPY0].dma_irq = 64;
dma[DMA_VIRTUAL_FLOPPY1].dma_irq = 65;
}
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