/* *  linux/arch/arm/kernel/dma-riscstation.c * *  Copyright (C) 1998 Russell King *  Copyright (C) 2002 Ben Dooks / Simtec Electronics * * 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 RiscStatiun architecture * * sliced down version of the RiscPC DMA code by RMK */#include <linux/sched.h>#include <linux/slab.h>#include <linux/mman.h>#include <linux/init.h>#include <linux/pci.h>#include <asm/page.h>#include <asm/dma.h>#include <asm/fiq.h>#include <asm/io.h>#include <asm/irq.h>#include <asm/hardware.h>#include <asm/uaccess.h>#include <asm/mach/dma.h>#include <asm/hardware/iomd.h>static struct fiq_handler fh = {	name: "floppydma"};static void floppy_enable_dma(dmach_t channel, dma_t *dma){	void *fiqhandler_start;	unsigned int fiqhandler_length;	struct pt_regs regs;	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;	}	regs.ARM_r9  = dma->buf.length;	regs.ARM_r10 = (unsigned long)dma->buf.address;	regs.ARM_fp  = FLOPPYDMA_BASE;	if (claim_fiq(&fh)) {		printk("floppydma: couldn't claim FIQ.\n");		return;	}	set_fiq_handler(fiqhandler_start, fiqhandler_length);	set_fiq_regs(&regs);	enable_fiq(dma->dma_irq);}static void floppy_disable_dma(dmach_t channel, dma_t *dma){	disable_fiq(dma->dma_irq);	release_fiq(&fh);}static int floppy_get_residue(dmach_t channel, dma_t *dma){	struct pt_regs regs;	get_fiq_regs(&regs);	return regs.ARM_r9;}static struct dma_ops floppy_dma_ops = {	type:		"FIQDMA",	enable:		floppy_enable_dma,	disable:	floppy_disable_dma,	residue:	floppy_get_residue,};/* * 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 0	iomd_writeb(0, IOMD_IO0CR);	iomd_writeb(0, IOMD_IO1CR);	iomd_writeb(0, IOMD_IO2CR);	iomd_writeb(0, IOMD_IO3CR);	iomd_writeb(0xa0, IOMD_DMATCR);#endif	dma[DMA_VIRTUAL_FLOPPY].dma_irq	= FIQ_FLOPPYDATA;	dma[DMA_VIRTUAL_FLOPPY].d_ops	= &floppy_dma_ops;	dma[DMA_VIRTUAL_SOUND].d_ops	= &sound_dma_ops;}