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/*
* Q40 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) 1999
*/
#include <asm/io.h>
#include <linux/vmalloc.h>
asmlinkage void floppy_hardint(int irq, void *dev_id, struct pt_regs * regs);
#define MAX_DMA_ADDRESS 0x00 /* nothing like that */
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);
}
#define fd_inb(port) inb_p(port)
#define fd_outb(port,value) outb_p(port,value)
#define fd_request_dma() vdma_request_dma(FLOPPY_DMA,"floppy")
/*#define fd_free_dma() */
#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_irq() free_irq(FLOPPY_IRQ, NULL)
#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 q40_floppy_init(void)
{
use_virtual_dma =1;
/* FLOPPY_IRQ=6; */
if (MACH_IS_Q40)
return 0x3f0;
else
return -1;
}
/*
* Again, the CMOS information doesn't work on the Q40..
*/
#define FLOPPY0_TYPE 6
#define FLOPPY1_TYPE 0
#define FLOPPY_MOTOR_MASK 0xf0
/* basically PC init + set use_virtual_dma */
#define FDC1 q40_floppy_init()
static int FDC2 = -1;
#define N_FDC 1
#define N_DRIVE 8
/* vdma stuff adapted from asm-i386/floppy.h */
static int virtual_dma_count=0;
static int virtual_dma_residue=0;
static char *virtual_dma_addr=0;
static int virtual_dma_mode=0;
static int doing_pdma=0;
static int fd_request_irq(void)
{
return request_irq(FLOPPY_IRQ, floppy_hardint,SA_INTERRUPT,
"floppy", NULL);
}
/*#define SLOW_DOWN do{outb(0,0x80);}while(0)*/
#define SLOW_DOWN do{int count=1;do{if(!jiffies)break;}while(count-->0);}while(0)
asmlinkage void floppy_hardint(int irq, void *dev_id, struct pt_regs * regs)
{
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, regs);
return;
}
#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;
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, regs);
return;
}
#ifdef TRACE_FLPY_INT
if(!virtual_dma_count)
dma_wait++;
#endif
}
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 = io;
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;
}
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