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/*
* 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/config.h>
#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;
}
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