273 lines
6.1 KiB
C
273 lines
6.1 KiB
C
/*
|
|
* Architecture specific parts of the Floppy driver
|
|
* include/asm-i386/floppy.h
|
|
*
|
|
* 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_SH_FLOPPY_H
|
|
#define __ASM_SH_FLOPPY_H
|
|
|
|
#include <linux/vmalloc.h>
|
|
|
|
|
|
/*
|
|
* The DMA channel used by the floppy controller cannot access data at
|
|
* addresses >= 16MB
|
|
*
|
|
* Went back to the 1MB limit, as some people had problems with the floppy
|
|
* driver otherwise. It doesn't matter much for performance anyway, as most
|
|
* floppy accesses go through the track buffer.
|
|
*/
|
|
#define _CROSS_64KB(a,s,vdma) \
|
|
(!vdma && ((unsigned long)(a)/K_64 != ((unsigned long)(a) + (s) - 1) / K_64))
|
|
|
|
#define CROSS_64KB(a,s) _CROSS_64KB(a,s,use_virtual_dma & 1)
|
|
|
|
|
|
#define SW fd_routine[use_virtual_dma&1]
|
|
#define CSW fd_routine[can_use_virtual_dma & 1]
|
|
|
|
|
|
#define fd_inb(port) inb_p(port)
|
|
#define fd_outb(value,port) outb_p(value,port)
|
|
|
|
#define fd_request_dma() CSW._request_dma(FLOPPY_DMA,"floppy")
|
|
#define fd_free_dma() CSW._free_dma(FLOPPY_DMA)
|
|
#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)
|
|
#define fd_get_dma_residue() SW._get_dma_residue(FLOPPY_DMA)
|
|
#define fd_dma_mem_alloc(size) SW._dma_mem_alloc(size)
|
|
#define fd_dma_setup(addr, size, mode, io) SW._dma_setup(addr, size, mode, io)
|
|
|
|
#define FLOPPY_CAN_FALLBACK_ON_NODMA
|
|
|
|
static int virtual_dma_count;
|
|
static int virtual_dma_residue;
|
|
static char *virtual_dma_addr;
|
|
static int virtual_dma_mode;
|
|
static int doing_pdma;
|
|
|
|
static void floppy_hardint(int irq, void *dev_id, struct pt_regs * regs)
|
|
{
|
|
register unsigned char st;
|
|
|
|
#undef TRACE_FLPY_INT
|
|
|
|
#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;
|
|
|
|
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 void fd_disable_dma(void)
|
|
{
|
|
if(! (can_use_virtual_dma & 1))
|
|
disable_dma(FLOPPY_DMA);
|
|
doing_pdma = 0;
|
|
virtual_dma_residue += virtual_dma_count;
|
|
virtual_dma_count=0;
|
|
}
|
|
|
|
static int vdma_request_dma(unsigned int dmanr, const char * device_id)
|
|
{
|
|
return 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,
|
|
IRQF_DISABLED, "floppy", NULL);
|
|
else
|
|
return request_irq(FLOPPY_IRQ, floppy_interrupt,
|
|
IRQF_DISABLED, "floppy", NULL);
|
|
}
|
|
|
|
static unsigned long dma_mem_alloc(unsigned long size)
|
|
{
|
|
return __get_dma_pages(GFP_KERNEL,get_order(size));
|
|
}
|
|
|
|
|
|
static unsigned long vdma_mem_alloc(unsigned long size)
|
|
{
|
|
return (unsigned long) vmalloc(size);
|
|
|
|
}
|
|
|
|
#define nodma_mem_alloc(size) vdma_mem_alloc(size)
|
|
|
|
static void _fd_dma_mem_free(unsigned long addr, unsigned long size)
|
|
{
|
|
if((unsigned int) addr >= (unsigned int) high_memory)
|
|
return vfree((void *)addr);
|
|
else
|
|
free_pages(addr, get_order(size));
|
|
}
|
|
|
|
#define fd_dma_mem_free(addr, size) _fd_dma_mem_free(addr, size)
|
|
|
|
static void _fd_chose_dma_mode(char *addr, unsigned long size)
|
|
{
|
|
if(can_use_virtual_dma == 2) {
|
|
if((unsigned int) addr >= (unsigned int) high_memory ||
|
|
virt_to_bus(addr) >= 0x10000000)
|
|
use_virtual_dma = 1;
|
|
else
|
|
use_virtual_dma = 0;
|
|
} else {
|
|
use_virtual_dma = can_use_virtual_dma & 1;
|
|
}
|
|
}
|
|
|
|
#define fd_chose_dma_mode(addr, size) _fd_chose_dma_mode(addr, size)
|
|
|
|
|
|
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 int hard_dma_setup(char *addr, unsigned long size, int mode, int io)
|
|
{
|
|
#ifdef FLOPPY_SANITY_CHECK
|
|
if (CROSS_64KB(addr, size)) {
|
|
printk("DMA crossing 64-K boundary %p-%p\n", addr, addr+size);
|
|
return -1;
|
|
}
|
|
#endif
|
|
|
|
dma_cache_wback_inv(addr, size);
|
|
|
|
/* actual, physical DMA */
|
|
doing_pdma = 0;
|
|
clear_dma_ff(FLOPPY_DMA);
|
|
set_dma_mode(FLOPPY_DMA,mode);
|
|
set_dma_addr(FLOPPY_DMA,virt_to_bus(addr));
|
|
set_dma_count(FLOPPY_DMA,size);
|
|
enable_dma(FLOPPY_DMA);
|
|
return 0;
|
|
}
|
|
|
|
static struct fd_routine_l {
|
|
int (*_request_dma)(unsigned int dmanr, const char * device_id);
|
|
void (*_free_dma)(unsigned int dmanr);
|
|
int (*_get_dma_residue)(unsigned int dummy);
|
|
unsigned long (*_dma_mem_alloc) (unsigned long size);
|
|
int (*_dma_setup)(char *addr, unsigned long size, int mode, int io);
|
|
} fd_routine[] = {
|
|
{
|
|
request_dma,
|
|
free_dma,
|
|
get_dma_residue,
|
|
dma_mem_alloc,
|
|
hard_dma_setup
|
|
},
|
|
{
|
|
vdma_request_dma,
|
|
vdma_nop,
|
|
vdma_get_dma_residue,
|
|
vdma_mem_alloc,
|
|
vdma_dma_setup
|
|
}
|
|
};
|
|
|
|
|
|
static int FDC1 = 0x3f0;
|
|
static int FDC2 = -1;
|
|
|
|
/*
|
|
* Floppy types are stored in the rtc's CMOS RAM and so rtc_lock
|
|
* is needed to prevent corrupted CMOS RAM in case "insmod floppy"
|
|
* coincides with another rtc CMOS user. Paul G.
|
|
*/
|
|
#define FLOPPY0_TYPE (4)
|
|
#define FLOPPY1_TYPE (0)
|
|
|
|
#define N_FDC 2
|
|
#define N_DRIVE 8
|
|
|
|
#define FLOPPY_MOTOR_MASK 0xf0
|
|
|
|
#define AUTO_DMA
|
|
|
|
#define EXTRA_FLOPPY_PARAMS
|
|
|
|
#endif /* __ASM_SH_FLOPPY_H */
|