/*
* 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_X86__FLOPPY_H
#define ASM_X86__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 irqreturn_t floppy_hardint(int irq, void *dev_id)
{
unsigned char st;
#undef TRACE_FLPY_INT
#ifdef TRACE_FLPY_INT
static int calls;
static int bytes;
static int dma_wait;
#endif
if (!doing_pdma)
return floppy_interrupt(irq, dev_id);
#ifdef TRACE_FLPY_INT
if (!calls)
bytes = virtual_dma_count;
#endif
{
int lcount;
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 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;
}
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|__GFP_NORETRY, 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 long)addr >= (unsigned long)high_memory)
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 long)addr >= (unsigned long)high_memory ||
isa_virt_to_bus(addr) >= 0x1000000 ||
_CROSS_64KB(addr, size, 0))
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
/* actual, physical DMA */
doing_pdma = 0;
clear_dma_ff(FLOPPY_DMA);
set_dma_mode(FLOPPY_DMA, mode);
set_dma_addr(FLOPPY_DMA, isa_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 \
({ \
unsigned long flags; \
unsigned char val; \
spin_lock_irqsave(&rtc_lock, flags); \
val = (CMOS_READ(0x10) >> 4) & 15; \
spin_unlock_irqrestore(&rtc_lock, flags); \
val; \
})
#define FLOPPY1_TYPE \
({ \
unsigned long flags; \
unsigned char val; \
spin_lock_irqsave(&rtc_lock, flags); \
val = CMOS_READ(0x10) & 15; \
spin_unlock_irqrestore(&rtc_lock, flags); \
val; \
})
#define N_FDC 2
#define N_DRIVE 8
#define EXTRA_FLOPPY_PARAMS
#endif /* ASM_X86__FLOPPY_H */
