![Jörn Engel](/assets/img/avatar_default.png)
Signed-off-by: Jörn Engel <joern@wohnheim.fh-wedel.de> Signed-off-by: Adrian Bunk <bunk@stusta.de>
215 lines
5.6 KiB
C
215 lines
5.6 KiB
C
/*
|
|
* linux/arch/arm26/kernel/dma.c
|
|
*
|
|
* Copyright (C) 1998-1999 Dave Gilbert / Russell King
|
|
* Copyright (C) 2003 Ian Molton
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License version 2 as
|
|
* published by the Free Software Foundation.
|
|
*
|
|
* DMA functions specific to Archimedes and A5000 architecture
|
|
*/
|
|
#include <linux/sched.h>
|
|
#include <linux/init.h>
|
|
|
|
#include <asm/dma.h>
|
|
#include <asm/fiq.h>
|
|
#include <asm/irq.h>
|
|
#include <asm/io.h>
|
|
#include <asm/hardware.h>
|
|
#include <asm/mach-types.h>
|
|
|
|
#define DPRINTK(x...) printk(KERN_DEBUG x)
|
|
|
|
#if defined(CONFIG_BLK_DEV_FD1772) || defined(CONFIG_BLK_DEV_FD1772_MODULE)
|
|
|
|
extern unsigned char fdc1772_dma_read, fdc1772_dma_read_end;
|
|
extern unsigned char fdc1772_dma_write, fdc1772_dma_write_end;
|
|
extern void fdc1772_setupdma(unsigned int count,unsigned int addr);
|
|
|
|
static void arc_floppy_data_enable_dma(dmach_t channel, dma_t *dma)
|
|
{
|
|
DPRINTK("arc_floppy_data_enable_dma\n");
|
|
|
|
if (dma->using_sg)
|
|
BUG();
|
|
|
|
switch (dma->dma_mode) {
|
|
case DMA_MODE_READ: { /* read */
|
|
unsigned long flags;
|
|
DPRINTK("enable_dma fdc1772 data read\n");
|
|
local_save_flags_cli(flags);
|
|
clf();
|
|
|
|
memcpy ((void *)0x1c, (void *)&fdc1772_dma_read,
|
|
&fdc1772_dma_read_end - &fdc1772_dma_read);
|
|
fdc1772_setupdma(dma->buf.length, dma->buf.__address); /* Sets data pointer up */
|
|
enable_fiq(FIQ_FLOPPYDATA);
|
|
local_irq_restore(flags);
|
|
}
|
|
break;
|
|
|
|
case DMA_MODE_WRITE: { /* write */
|
|
unsigned long flags;
|
|
DPRINTK("enable_dma fdc1772 data write\n");
|
|
local_save_flags_cli(flags);
|
|
clf();
|
|
memcpy ((void *)0x1c, (void *)&fdc1772_dma_write,
|
|
&fdc1772_dma_write_end - &fdc1772_dma_write);
|
|
fdc1772_setupdma(dma->buf.length, dma->buf.__address); /* Sets data pointer up */
|
|
enable_fiq(FIQ_FLOPPYDATA);
|
|
|
|
local_irq_restore(flags);
|
|
}
|
|
break;
|
|
default:
|
|
printk ("enable_dma: dma%d not initialised\n", channel);
|
|
}
|
|
}
|
|
|
|
static int arc_floppy_data_get_dma_residue(dmach_t channel, dma_t *dma)
|
|
{
|
|
extern unsigned int fdc1772_bytestogo;
|
|
|
|
/* 10/1/1999 DAG - I presume its the number of bytes left? */
|
|
return fdc1772_bytestogo;
|
|
}
|
|
|
|
static void arc_floppy_cmdend_enable_dma(dmach_t channel, dma_t *dma)
|
|
{
|
|
/* Need to build a branch at the FIQ address */
|
|
extern void fdc1772_comendhandler(void);
|
|
unsigned long flags;
|
|
|
|
DPRINTK("arc_floppy_cmdend_enable_dma\n");
|
|
/*printk("enable_dma fdc1772 command end FIQ\n");*/
|
|
save_flags(flags);
|
|
clf();
|
|
|
|
/* B fdc1772_comendhandler */
|
|
*((unsigned int *)0x1c)=0xea000000 |
|
|
(((unsigned int)fdc1772_comendhandler-(0x1c+8))/4);
|
|
|
|
local_irq_restore(flags);
|
|
}
|
|
|
|
static int arc_floppy_cmdend_get_dma_residue(dmach_t channel, dma_t *dma)
|
|
{
|
|
/* 10/1/1999 DAG - Presume whether there is an outstanding command? */
|
|
extern unsigned int fdc1772_fdc_int_done;
|
|
|
|
/* Explicit! If the int done is 0 then 1 int to go */
|
|
return (fdc1772_fdc_int_done==0)?1:0;
|
|
}
|
|
|
|
static void arc_disable_dma(dmach_t channel, dma_t *dma)
|
|
{
|
|
disable_fiq(dma->dma_irq);
|
|
}
|
|
|
|
static struct dma_ops arc_floppy_data_dma_ops = {
|
|
.type = "FIQDMA",
|
|
.enable = arc_floppy_data_enable_dma,
|
|
.disable = arc_disable_dma,
|
|
.residue = arc_floppy_data_get_dma_residue,
|
|
};
|
|
|
|
static struct dma_ops arc_floppy_cmdend_dma_ops = {
|
|
.type = "FIQCMD",
|
|
.enable = arc_floppy_cmdend_enable_dma,
|
|
.disable = arc_disable_dma,
|
|
.residue = arc_floppy_cmdend_get_dma_residue,
|
|
};
|
|
#endif
|
|
|
|
#ifdef CONFIG_ARCH_A5K
|
|
static struct fiq_handler fh = {
|
|
.name = "floppydata"
|
|
};
|
|
|
|
static int a5k_floppy_get_dma_residue(dmach_t channel, dma_t *dma)
|
|
{
|
|
struct pt_regs regs;
|
|
get_fiq_regs(®s);
|
|
return regs.ARM_r9;
|
|
}
|
|
|
|
static void a5k_floppy_enable_dma(dmach_t channel, dma_t *dma)
|
|
{
|
|
struct pt_regs regs;
|
|
void *fiqhandler_start;
|
|
unsigned int fiqhandler_length;
|
|
extern void floppy_fiqsetup(unsigned long len, unsigned long addr,
|
|
unsigned long port);
|
|
|
|
if (dma->using_sg)
|
|
BUG();
|
|
|
|
if (dma->dma_mode == DMA_MODE_READ) {
|
|
extern unsigned char floppy_fiqin_start, floppy_fiqin_end;
|
|
fiqhandler_start = &floppy_fiqin_start;
|
|
fiqhandler_length = &floppy_fiqin_end - &floppy_fiqin_start;
|
|
} else {
|
|
extern unsigned char floppy_fiqout_start, floppy_fiqout_end;
|
|
fiqhandler_start = &floppy_fiqout_start;
|
|
fiqhandler_length = &floppy_fiqout_end - &floppy_fiqout_start;
|
|
}
|
|
if (claim_fiq(&fh)) {
|
|
printk("floppydma: couldn't claim FIQ.\n");
|
|
return;
|
|
}
|
|
memcpy((void *)0x1c, fiqhandler_start, fiqhandler_length);
|
|
regs.ARM_r9 = dma->buf.length;
|
|
regs.ARM_r10 = (unsigned long)dma->buf.__address;
|
|
regs.ARM_fp = FLOPPYDMA_BASE;
|
|
set_fiq_regs(®s);
|
|
enable_fiq(dma->dma_irq);
|
|
}
|
|
|
|
static void a5k_floppy_disable_dma(dmach_t channel, dma_t *dma)
|
|
{
|
|
disable_fiq(dma->dma_irq);
|
|
release_fiq(&fh);
|
|
}
|
|
|
|
static struct dma_ops a5k_floppy_dma_ops = {
|
|
.type = "FIQDMA",
|
|
.enable = a5k_floppy_enable_dma,
|
|
.disable = a5k_floppy_disable_dma,
|
|
.residue = a5k_floppy_get_dma_residue,
|
|
};
|
|
#endif
|
|
|
|
/*
|
|
* This is virtual DMA - we don't need anything here
|
|
*/
|
|
static void sound_enable_disable_dma(dmach_t channel, dma_t *dma)
|
|
{
|
|
}
|
|
|
|
static struct dma_ops sound_dma_ops = {
|
|
.type = "VIRTUAL",
|
|
.enable = sound_enable_disable_dma,
|
|
.disable = sound_enable_disable_dma,
|
|
};
|
|
|
|
void __init arch_dma_init(dma_t *dma)
|
|
{
|
|
#if defined(CONFIG_BLK_DEV_FD1772) || defined(CONFIG_BLK_DEV_FD1772_MODULE)
|
|
if (machine_is_archimedes()) {
|
|
dma[DMA_VIRTUAL_FLOPPY0].dma_irq = FIQ_FLOPPYDATA;
|
|
dma[DMA_VIRTUAL_FLOPPY0].d_ops = &arc_floppy_data_dma_ops;
|
|
dma[DMA_VIRTUAL_FLOPPY1].dma_irq = 1;
|
|
dma[DMA_VIRTUAL_FLOPPY1].d_ops = &arc_floppy_cmdend_dma_ops;
|
|
}
|
|
#endif
|
|
#ifdef CONFIG_ARCH_A5K
|
|
if (machine_is_a5k()) {
|
|
dma[DMA_VIRTUAL_FLOPPY0].dma_irq = FIQ_FLOPPYDATA;
|
|
dma[DMA_VIRTUAL_FLOPPY0].d_ops = &a5k_floppy_dma_ops;
|
|
}
|
|
#endif
|
|
dma[DMA_VIRTUAL_SOUND].d_ops = &sound_dma_ops;
|
|
}
|