/*
* 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
*/
#ifndef __ASM_POWERPC_FLOPPY_H
#define __ASM_POWERPC_FLOPPY_H
#ifdef __KERNEL__

#include <asm/machdep.h>

#define fd_inb(port) inb_p(port)
#define fd_outb(value,port) outb_p(value,port)

#define fd_enable_dma() enable_dma(FLOPPY_DMA)
#define fd_disable_dma() fd_ops->_disable_dma(FLOPPY_DMA)
#define fd_free_dma() fd_ops->_free_dma(FLOPPY_DMA)
#define fd_clear_dma_ff() clear_dma_ff(FLOPPY_DMA)
#define fd_set_dma_mode(mode) set_dma_mode(FLOPPY_DMA, mode)
#define fd_set_dma_count(count) set_dma_count(FLOPPY_DMA, count)
#define fd_get_dma_residue() fd_ops->_get_dma_residue(FLOPPY_DMA)
#define fd_enable_irq() enable_irq(FLOPPY_IRQ)
#define fd_disable_irq() disable_irq(FLOPPY_IRQ)
#define fd_cacheflush(addr,size) /* nothing */
#define fd_free_irq() free_irq(FLOPPY_IRQ, NULL);

#include <linux/pci.h>
#include <asm/ppc-pci.h> /* for isa_bridge_pcidev */

#define fd_dma_setup(addr,size,mode,io) fd_ops->_dma_setup(addr,size,mode,io)

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)
{
unsigned char st;
int lcount;
char *lptr;

if (!doing_vdma)
return floppy_interrupt(irq, dev_id);


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);
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,
0, "floppy", NULL);
else
return request_irq(FLOPPY_IRQ, floppy_interrupt,
0, "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)
{
static unsigned long prev_size;
static dma_addr_t bus_addr = 0;
static char *prev_addr;
static int prev_dir;
int dir;

doing_vdma = 0;
dir = (mode == DMA_MODE_READ) ? PCI_DMA_FROMDEVICE : PCI_DMA_TODEVICE;

if (bus_addr
&& (addr != prev_addr || size != prev_size || dir != prev_dir)) {
/* different from last time -- unmap prev */
pci_unmap_single(isa_bridge_pcidev, bus_addr, prev_size, prev_dir);
bus_addr = 0;
}

if (!bus_addr) /* need to map it */
bus_addr = pci_map_single(isa_bridge_pcidev, addr, size, dir);

/* remember this one as prev */
prev_addr = addr;
prev_size = size;
prev_dir = dir;

fd_clear_dma_ff();
fd_cacheflush(addr, size);
fd_set_dma_mode(mode);
set_dma_addr(FLOPPY_DMA, bus_addr);
fd_set_dma_count(size);
virtual_dma_port = io;
fd_enable_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(void)
{
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

/*
* The PowerPC has no problems with floppy DMA crossing 64k borders.
*/
#define CROSS_64KB(a,s) (0)

#define EXTRA_FLOPPY_PARAMS

#endif /* __KERNEL__ */
#endif /* __ASM_POWERPC_FLOPPY_H */