floppy.h
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/*
* Architecture specific parts of the Floppy driver
*
* This file is subject to the terms and conditions of the GNU General Public
* License. See the file "COPYING" in the main directory of this archive
* for more details.
*
* Copyright (C) 1995
*/
#ifdef __KERNEL__
#ifndef __ASM_PPC_FLOPPY_H
#define __ASM_PPC_FLOPPY_H
#define fd_inb(port) inb_p(port)
#define fd_outb(value,port) outb_p(value,port)
#define fd_disable_dma() fd_ops->_disable_dma(FLOPPY_DMA)
#define fd_free_dma() fd_ops->_free_dma(FLOPPY_DMA)
#define fd_get_dma_residue() fd_ops->_get_dma_residue(FLOPPY_DMA)
#define fd_dma_setup(addr, size, mode, io) fd_ops->_dma_setup(addr, size, mode, io)
#define fd_enable_irq() enable_irq(FLOPPY_IRQ)
#define fd_disable_irq() disable_irq(FLOPPY_IRQ)
#define fd_free_irq() free_irq(FLOPPY_IRQ, NULL);
static int fd_request_dma(void);
struct fd_dma_ops {
void (*_disable_dma)(unsigned int dmanr);
void (*_free_dma)(unsigned int dmanr);
int (*_get_dma_residue)(unsigned int dummy);
int (*_dma_setup)(char *addr, unsigned long size, int mode, int io);
};
static int virtual_dma_count;
static int virtual_dma_residue;
static char *virtual_dma_addr;
static int virtual_dma_mode;
static int doing_vdma;
static struct fd_dma_ops *fd_ops;
static irqreturn_t floppy_hardint(int irq, void *dev_id, struct pt_regs * regs)
{
unsigned char st;
int lcount;
char *lptr;
if (!doing_vdma)
return floppy_interrupt(irq, dev_id, regs);
st = 1;
for (lcount=virtual_dma_count, lptr=virtual_dma_addr;
lcount; lcount--, lptr++) {
st=inb(virtual_dma_port+4) & 0xa0 ;
if (st != 0xa0)
break;
if (virtual_dma_mode)
outb_p(*lptr, virtual_dma_port+5);
else
*lptr = inb_p(virtual_dma_port+5);
}
virtual_dma_count = lcount;
virtual_dma_addr = lptr;
st = inb(virtual_dma_port+4);
if (st == 0x20)
return IRQ_HANDLED;
if (!(st & 0x20)) {
virtual_dma_residue += virtual_dma_count;
virtual_dma_count=0;
doing_vdma = 0;
floppy_interrupt(irq, dev_id, regs);
return IRQ_HANDLED;
}
return IRQ_HANDLED;
}
static void vdma_disable_dma(unsigned int dummy)
{
doing_vdma = 0;
virtual_dma_residue += virtual_dma_count;
virtual_dma_count=0;
}
static void vdma_nop(unsigned int dummy)
{
}
static int vdma_get_dma_residue(unsigned int dummy)
{
return virtual_dma_count + virtual_dma_residue;
}
static int fd_request_irq(void)
{
if (can_use_virtual_dma)
return request_irq(FLOPPY_IRQ, floppy_hardint,SA_INTERRUPT,
"floppy", NULL);
else
return request_irq(FLOPPY_IRQ, floppy_interrupt,
SA_INTERRUPT|SA_SAMPLE_RANDOM,
"floppy", NULL);
}
static int vdma_dma_setup(char *addr, unsigned long size, int mode, int io)
{
doing_vdma = 1;
virtual_dma_port = io;
virtual_dma_mode = (mode == DMA_MODE_WRITE);
virtual_dma_addr = addr;
virtual_dma_count = size;
virtual_dma_residue = 0;
return 0;
}
static int hard_dma_setup(char *addr, unsigned long size, int mode, int io)
{
/* actual, physical DMA */
doing_vdma = 0;
clear_dma_ff(FLOPPY_DMA);
set_dma_mode(FLOPPY_DMA,mode);
set_dma_addr(FLOPPY_DMA,(unsigned int)virt_to_bus(addr));
set_dma_count(FLOPPY_DMA,size);
enable_dma(FLOPPY_DMA);
return 0;
}
static struct fd_dma_ops real_dma_ops =
{
._disable_dma = disable_dma,
._free_dma = free_dma,
._get_dma_residue = get_dma_residue,
._dma_setup = hard_dma_setup
};
static struct fd_dma_ops virt_dma_ops =
{
._disable_dma = vdma_disable_dma,
._free_dma = vdma_nop,
._get_dma_residue = vdma_get_dma_residue,
._dma_setup = vdma_dma_setup
};
static int fd_request_dma()
{
if (can_use_virtual_dma & 1) {
fd_ops = &virt_dma_ops;
return 0;
}
else {
fd_ops = &real_dma_ops;
return request_dma(FLOPPY_DMA, "floppy");
}
}
static int FDC1 = 0x3f0;
static int FDC2 = -1;
/*
* Again, the CMOS information not available
*/
#define FLOPPY0_TYPE 6
#define FLOPPY1_TYPE 0
#define N_FDC 2 /* Don't change this! */
#define N_DRIVE 8
#define FLOPPY_MOTOR_MASK 0xf0
/*
* The PowerPC has no problems with floppy DMA crossing 64k borders.
*/
#define CROSS_64KB(a,s) (0)
#endif /* __ASM_PPC_FLOPPY_H */
#define EXTRA_FLOPPY_PARAMS
#endif /* __KERNEL__ */