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/*

 * 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_I386_FLOPPY_H

#define __ASM_I386_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(port,value)             outb_p(port,value)

#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, 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)

                return floppy_interrupt(irq, dev_id, regs);

#ifdef TRACE_FLPY_INT

        if(!calls)

                bytes = virtual_dma_count;

#endif

#ifndef NO_FLOPPY_ASSEMBLER

        __asm__ (

       "testl %1,%1"

        "je 3f"

"1:     inb %w4,%b0"

        "andb $160,%b0"

        "cmpb $160,%b0"

        "jne 2f"

        "incw %w4"

        "testl %3,%3"

        "jne 4f"

        "inb %w4,%b0"

        "movb %0,(%2)"

        "jmp 5f"

"4:     movb (%2),%0"

        "outb %b0,%w4"

"5:     decw %w4"

        "outb %0,$0x80"

        "decl %1"

        "incl %2"

        "testl %1,%1"

        "jne 1b"

"3:     inb %w4,%b0"

"2:     "

       : "=a" ((char) st),

       "=c" ((long) virtual_dma_count),

       "=S" ((long) virtual_dma_addr)

       : "b" ((long) virtual_dma_mode),

       "d" ((short) virtual_dma_port+4),

       "1" ((long) virtual_dma_count),

       "2" ((long) virtual_dma_addr));

#else   

        {

                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);

        }

#endif

#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, regs);

                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,SA_INTERRUPT,

                                                   "floppy", NULL);

        else

                return request_irq(FLOPPY_IRQ, floppy_interrupt,

                                                   SA_INTERRUPT|SA_SAMPLE_RANDOM,

                                                   "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 ||

                   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;

}

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 FLOPPY_MOTOR_MASK 0xf0

#define AUTO_DMA

#define EXTRA_FLOPPY_PARAMS

#endif /* __ASM_I386_FLOPPY_H */