255 lines
5.1 KiB
C
255 lines
5.1 KiB
C
/*
|
|
* Implementation independent bits of the Floppy driver.
|
|
*
|
|
* much of this file is derived from what was originally the Q40 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) 1999, 2000, 2001
|
|
*
|
|
* Sun3x support added 2/4/2000 Sam Creasey (sammy@sammy.net)
|
|
*
|
|
*/
|
|
|
|
#include <asm/io.h>
|
|
|
|
#include <linux/vmalloc.h>
|
|
|
|
asmlinkage irqreturn_t floppy_hardint(int irq, void *dev_id);
|
|
|
|
/* constants... */
|
|
|
|
#undef MAX_DMA_ADDRESS
|
|
#define MAX_DMA_ADDRESS 0x00 /* nothing like that */
|
|
|
|
|
|
/*
|
|
* Again, the CMOS information doesn't work on m68k..
|
|
*/
|
|
#define FLOPPY0_TYPE (MACH_IS_Q40 ? 6 : 4)
|
|
#define FLOPPY1_TYPE 0
|
|
|
|
/* basically PC init + set use_virtual_dma */
|
|
#define FDC1 m68k_floppy_init()
|
|
|
|
#define N_FDC 1
|
|
#define N_DRIVE 8
|
|
|
|
|
|
/* vdma globals adapted from asm-i386/floppy.h */
|
|
|
|
static int virtual_dma_count=0;
|
|
static int virtual_dma_residue=0;
|
|
static char *virtual_dma_addr=NULL;
|
|
static int virtual_dma_mode=0;
|
|
static int doing_pdma=0;
|
|
|
|
#include <asm/sun3xflop.h>
|
|
|
|
extern spinlock_t dma_spin_lock;
|
|
|
|
static __inline__ unsigned long claim_dma_lock(void)
|
|
{
|
|
unsigned long flags;
|
|
spin_lock_irqsave(&dma_spin_lock, flags);
|
|
return flags;
|
|
}
|
|
|
|
static __inline__ void release_dma_lock(unsigned long flags)
|
|
{
|
|
spin_unlock_irqrestore(&dma_spin_lock, flags);
|
|
}
|
|
|
|
|
|
static __inline__ unsigned char fd_inb(int port)
|
|
{
|
|
if(MACH_IS_Q40)
|
|
return inb_p(port);
|
|
else if(MACH_IS_SUN3X)
|
|
return sun3x_82072_fd_inb(port);
|
|
return 0;
|
|
}
|
|
|
|
static __inline__ void fd_outb(unsigned char value, int port)
|
|
{
|
|
if(MACH_IS_Q40)
|
|
outb_p(value, port);
|
|
else if(MACH_IS_SUN3X)
|
|
sun3x_82072_fd_outb(value, port);
|
|
}
|
|
|
|
|
|
static int fd_request_irq(void)
|
|
{
|
|
if(MACH_IS_Q40)
|
|
return request_irq(FLOPPY_IRQ, floppy_hardint,
|
|
IRQF_DISABLED, "floppy", floppy_hardint);
|
|
else if(MACH_IS_SUN3X)
|
|
return sun3xflop_request_irq();
|
|
return -ENXIO;
|
|
}
|
|
|
|
static void fd_free_irq(void)
|
|
{
|
|
if(MACH_IS_Q40)
|
|
free_irq(FLOPPY_IRQ, floppy_hardint);
|
|
}
|
|
|
|
#define fd_request_dma() vdma_request_dma(FLOPPY_DMA,"floppy")
|
|
#define fd_get_dma_residue() vdma_get_dma_residue(FLOPPY_DMA)
|
|
#define fd_dma_mem_alloc(size) vdma_mem_alloc(size)
|
|
#define fd_dma_setup(addr, size, mode, io) vdma_dma_setup(addr, size, mode, io)
|
|
|
|
#define fd_enable_irq() /* nothing... */
|
|
#define fd_disable_irq() /* nothing... */
|
|
|
|
#define fd_free_dma() /* nothing */
|
|
|
|
/* No 64k boundary crossing problems on Q40 - no DMA at all */
|
|
#define CROSS_64KB(a,s) (0)
|
|
|
|
#define DMA_MODE_READ 0x44 /* i386 look-alike */
|
|
#define DMA_MODE_WRITE 0x48
|
|
|
|
|
|
static int m68k_floppy_init(void)
|
|
{
|
|
use_virtual_dma =1;
|
|
can_use_virtual_dma = 1;
|
|
|
|
|
|
if (MACH_IS_Q40)
|
|
return 0x3f0;
|
|
else if(MACH_IS_SUN3X)
|
|
return sun3xflop_init();
|
|
else
|
|
return -1;
|
|
}
|
|
|
|
|
|
static int vdma_request_dma(unsigned int dmanr, const char * device_id)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
|
|
static int vdma_get_dma_residue(unsigned int dummy)
|
|
{
|
|
return virtual_dma_count + virtual_dma_residue;
|
|
}
|
|
|
|
|
|
static unsigned long vdma_mem_alloc(unsigned long size)
|
|
{
|
|
return (unsigned long) vmalloc(size);
|
|
|
|
}
|
|
|
|
static void _fd_dma_mem_free(unsigned long addr, unsigned long size)
|
|
{
|
|
vfree((void *)addr);
|
|
}
|
|
#define fd_dma_mem_free(addr,size) _fd_dma_mem_free(addr, size)
|
|
|
|
|
|
/* choose_dma_mode ???*/
|
|
|
|
static int vdma_dma_setup(char *addr, unsigned long size, int mode, int io)
|
|
{
|
|
doing_pdma = 1;
|
|
virtual_dma_port = (MACH_IS_Q40 ? io : 0);
|
|
virtual_dma_mode = (mode == DMA_MODE_WRITE);
|
|
virtual_dma_addr = addr;
|
|
virtual_dma_count = size;
|
|
virtual_dma_residue = 0;
|
|
return 0;
|
|
}
|
|
|
|
|
|
|
|
static void fd_disable_dma(void)
|
|
{
|
|
doing_pdma = 0;
|
|
virtual_dma_residue += virtual_dma_count;
|
|
virtual_dma_count=0;
|
|
}
|
|
|
|
|
|
|
|
/* this is the only truly Q40 specific function */
|
|
|
|
asmlinkage irqreturn_t floppy_hardint(int irq, void *dev_id)
|
|
{
|
|
register unsigned char st;
|
|
|
|
#undef TRACE_FLPY_INT
|
|
#define NO_FLOPPY_ASSEMBLER
|
|
|
|
#ifdef TRACE_FLPY_INT
|
|
static int calls=0;
|
|
static int bytes=0;
|
|
static int dma_wait=0;
|
|
#endif
|
|
if(!doing_pdma) {
|
|
floppy_interrupt(irq, dev_id);
|
|
return IRQ_HANDLED;
|
|
}
|
|
|
|
#ifdef TRACE_FLPY_INT
|
|
if(!calls)
|
|
bytes = virtual_dma_count;
|
|
#endif
|
|
|
|
{
|
|
register int lcount;
|
|
register char *lptr;
|
|
|
|
/* serve 1st byte fast: */
|
|
|
|
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);
|
|
}
|
|
|
|
#ifdef TRACE_FLPY_INT
|
|
calls++;
|
|
#endif
|
|
if(st == 0x20)
|
|
return IRQ_HANDLED;
|
|
if(!(st & 0x20)) {
|
|
virtual_dma_residue += virtual_dma_count;
|
|
virtual_dma_count=0;
|
|
#ifdef TRACE_FLPY_INT
|
|
printk("count=%x, residue=%x calls=%d bytes=%d dma_wait=%d\n",
|
|
virtual_dma_count, virtual_dma_residue, calls, bytes,
|
|
dma_wait);
|
|
calls = 0;
|
|
dma_wait=0;
|
|
#endif
|
|
doing_pdma = 0;
|
|
floppy_interrupt(irq, dev_id);
|
|
return IRQ_HANDLED;
|
|
}
|
|
#ifdef TRACE_FLPY_INT
|
|
if(!virtual_dma_count)
|
|
dma_wait++;
|
|
#endif
|
|
return IRQ_HANDLED;
|
|
}
|
|
|
|
#define EXTRA_FLOPPY_PARAMS
|