/* *  linux/arch/arm/kernel/dma-arc.c * *  Copyright (C) 1998-1999 Dave Gilbert / Russell King * * 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>#include <asm/mach/dma.h>#define DPRINTK(x...) printk(KERN_DEBUG x)#if defined(CONFIG_BLK_DEV_FD1772) || defined(CONFIG_BLK_DEV_FD1772_MODULE)static void arc_floppy_data_enable_dma(dmach_t channel, dma_t *dma){	DPRINTK("arc_floppy_data_enable_dma\n");	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;		DPRINTK("enable_dma fdc1772 data read\n");		local_save_flags(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 */		extern unsigned char fdc1772_dma_write, fdc1772_dma_write_end;		extern void fdc1772_setupdma(unsigned int count,unsigned int addr);		unsigned long flags;		DPRINTK("enable_dma fdc1772 data write\n");		local_save_flags(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");*/	local_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_A5Kstatic 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(&regs);	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->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(&regs);	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;}