/*
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/*
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* arch/arm/kernel/dma-arc.c
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* arch/arm/kernel/dma-arc.c
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*
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*
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* Copyright (C) 1998 Dave Gilbert / Russell King
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* Copyright (C) 1998 Dave Gilbert / Russell King
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*
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*
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* DMA functions specific to Archimedes architecture
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* DMA functions specific to Archimedes architecture
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*/
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*/
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#include <linux/sched.h>
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#include <linux/sched.h>
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#include <asm/dma.h>
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#include <asm/dma.h>
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#include <asm/io.h>
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#include <asm/io.h>
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#include <asm/hardware.h>
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#include <asm/hardware.h>
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#include "dma.h"
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#include "dma.h"
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int arch_get_dma_residue(dmach_t channel, dma_t *dma)
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int arch_get_dma_residue(dmach_t channel, dma_t *dma)
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{
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{
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if (channel != DMA_VIRTUAL_FLOPPY0 &&
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if (channel != DMA_VIRTUAL_FLOPPY0 &&
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channel != DMA_VIRTUAL_FLOPPY1) {
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channel != DMA_VIRTUAL_FLOPPY1) {
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printk ("arch_dma_count: invalid channel %d\n", channel);
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printk ("arch_dma_count: invalid channel %d\n", channel);
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return 0;
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return 0;
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} else {
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} else {
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extern int fdc1772_bytestogo;
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extern int fdc1772_bytestogo;
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return fdc1772_bytestogo;
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return fdc1772_bytestogo;
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}
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}
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}
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}
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int arch_request_dma(dmach_t channel, dma_t *dma, const char *devname)
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int arch_request_dma(dmach_t channel, dma_t *dma, const char *devname)
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{
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{
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if (channel == DMA_VIRTUAL_FLOPPY0 ||
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if (channel == DMA_VIRTUAL_FLOPPY0 ||
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channel == DMA_VIRTUAL_FLOPPY1)
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channel == DMA_VIRTUAL_FLOPPY1)
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return 0;
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return 0;
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else
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else
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return -EINVAL;
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return -EINVAL;
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}
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}
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void arch_free_dma(dmach_t channel, dma_t *dma)
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void arch_free_dma(dmach_t channel, dma_t *dma)
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{
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{
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if (channel != DMA_VIRTUAL_FLOPPY0 &&
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if (channel != DMA_VIRTUAL_FLOPPY0 &&
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channel != DMA_VIRTUAL_FLOPPY1)
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channel != DMA_VIRTUAL_FLOPPY1)
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return 0;
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return 0;
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else
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else
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return -EINVAL;
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return -EINVAL;
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}
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}
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void arch_enable_dma(dmach_t channel, dma_t *dma)
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void arch_enable_dma(dmach_t channel, dma_t *dma)
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{
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{
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switch (channel) {
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switch (channel) {
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case DMA_VIRTUAL_FLOPPY0: { /* Data DMA */
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case DMA_VIRTUAL_FLOPPY0: { /* Data DMA */
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switch (dma->dma_mode) {
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switch (dma->dma_mode) {
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case DMA_MODE_READ: /* read */
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case DMA_MODE_READ: /* read */
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{
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{
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extern unsigned char fdc1772_dma_read, fdc1772_dma_read_end;
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extern unsigned char fdc1772_dma_read, fdc1772_dma_read_end;
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extern void fdc1772_setupdma(unsigned int count,unsigned int addr);
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extern void fdc1772_setupdma(unsigned int count,unsigned int addr);
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unsigned long flags;
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unsigned long flags;
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#ifdef DEBUG
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#ifdef DEBUG
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printk("enable_dma fdc1772 data read\n");
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printk("enable_dma fdc1772 data read\n");
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#endif
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#endif
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save_flags(flags);
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save_flags(flags);
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cliIF();
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cliIF();
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memcpy ((void *)0x1c, (void *)&fdc1772_dma_read,
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memcpy ((void *)0x1c, (void *)&fdc1772_dma_read,
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&fdc1772_dma_read_end - &fdc1772_dma_read);
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&fdc1772_dma_read_end - &fdc1772_dma_read);
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fdc1772_setupdma(dma->buf.length, __bus_to_virt(dma->buf.address)); /* Sets data pointer up */
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fdc1772_setupdma(dma->buf.length, __bus_to_virt(dma->buf.address)); /* Sets data pointer up */
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enable_irq (64);
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enable_irq (64);
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restore_flags(flags);
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restore_flags(flags);
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}
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}
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break;
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break;
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case DMA_MODE_WRITE: /* write */
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case DMA_MODE_WRITE: /* write */
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{
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{
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extern unsigned char fdc1772_dma_write, fdc1772_dma_write_end;
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extern unsigned char fdc1772_dma_write, fdc1772_dma_write_end;
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extern void fdc1772_setupdma(unsigned int count,unsigned int addr);
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extern void fdc1772_setupdma(unsigned int count,unsigned int addr);
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unsigned long flags;
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unsigned long flags;
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#ifdef DEBUG
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#ifdef DEBUG
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printk("enable_dma fdc1772 data write\n");
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printk("enable_dma fdc1772 data write\n");
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#endif
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#endif
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save_flags(flags);
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save_flags(flags);
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cliIF();
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cliIF();
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memcpy ((void *)0x1c, (void *)&fdc1772_dma_write,
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memcpy ((void *)0x1c, (void *)&fdc1772_dma_write,
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&fdc1772_dma_write_end - &fdc1772_dma_write);
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&fdc1772_dma_write_end - &fdc1772_dma_write);
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fdc1772_setupdma(dma->buf.length, __bus_to_virt(dma->buf.address)); /* Sets data pointer up */
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fdc1772_setupdma(dma->buf.length, __bus_to_virt(dma->buf.address)); /* Sets data pointer up */
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enable_irq (64);
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enable_irq (64);
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restore_flags(flags);
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restore_flags(flags);
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}
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}
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break;
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break;
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default:
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default:
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printk ("enable_dma: dma%d not initialised\n", channel);
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printk ("enable_dma: dma%d not initialised\n", channel);
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return;
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return;
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}
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}
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}
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}
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break;
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break;
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case DMA_VIRTUAL_FLOPPY1: { /* Command end FIQ - actually just sets a flag */
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case DMA_VIRTUAL_FLOPPY1: { /* Command end FIQ - actually just sets a flag */
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/* Need to build a branch at the FIQ address */
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/* Need to build a branch at the FIQ address */
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extern void fdc1772_comendhandler(void);
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extern void fdc1772_comendhandler(void);
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unsigned long flags;
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unsigned long flags;
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/*printk("enable_dma fdc1772 command end FIQ\n");*/
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/*printk("enable_dma fdc1772 command end FIQ\n");*/
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save_flags(flags);
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save_flags(flags);
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cliIF();
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cliIF();
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*((unsigned int *)0x1c)=0xea000000 | (((unsigned int)fdc1772_comendhandler-(0x1c+8))/4); /* B fdc1772_comendhandler */
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*((unsigned int *)0x1c)=0xea000000 | (((unsigned int)fdc1772_comendhandler-(0x1c+8))/4); /* B fdc1772_comendhandler */
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restore_flags(flags);
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restore_flags(flags);
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}
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}
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break;
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break;
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}
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}
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}
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}
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void arch_disable_dma(dmach_t channel, dma_t *dma)
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void arch_disable_dma(dmach_t channel, dma_t *dma)
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{
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{
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if (channel != DMA_VIRTUAL_FLOPPY0 &&
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if (channel != DMA_VIRTUAL_FLOPPY0 &&
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channel != DMA_VIRTUAL_FLOPPY1)
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channel != DMA_VIRTUAL_FLOPPY1)
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printk("arch_disable_dma: invalid channel %d\n", channel);
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printk("arch_disable_dma: invalid channel %d\n", channel);
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else
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else
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disable_irq(dma->dma_irq);
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disable_irq(dma->dma_irq);
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}
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}
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void arch_dma_init(dma_t *dma)
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void arch_dma_init(dma_t *dma)
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{
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{
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dma[DMA_VIRTUAL_FLOPPY0].dma_irq = 64;
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dma[DMA_VIRTUAL_FLOPPY0].dma_irq = 64;
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dma[DMA_VIRTUAL_FLOPPY1].dma_irq = 65;
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dma[DMA_VIRTUAL_FLOPPY1].dma_irq = 65;
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}
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}
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