cregit-Linux how code gets into the kernel

Release 4.10 arch/mips/include/asm/mach-generic/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) 1996, 1997, 1998, 2003 by Ralf Baechle
 */
#ifndef __ASM_MACH_GENERIC_FLOPPY_H

#define __ASM_MACH_GENERIC_FLOPPY_H

#include <linux/delay.h>
#include <linux/ioport.h>
#include <linux/sched.h>
#include <linux/linkage.h>
#include <linux/types.h>
#include <linux/mm.h>

#include <asm/bootinfo.h>
#include <asm/cachectl.h>
#include <asm/dma.h>
#include <asm/floppy.h>
#include <asm/io.h>
#include <asm/irq.h>
#include <asm/pgtable.h>

/*
 * How to access the FDC's registers.
 */

static inline unsigned char fd_inb(unsigned int port) { return inb_p(port); }

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static inline void fd_outb(unsigned char value, unsigned int port) { outb_p(value, port); }

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/* * How to access the floppy DMA functions. */
static inline void fd_enable_dma(void) { enable_dma(FLOPPY_DMA); }

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static inline void fd_disable_dma(void) { disable_dma(FLOPPY_DMA); }

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static inline int fd_request_dma(void) { return request_dma(FLOPPY_DMA, "floppy"); }

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static inline void fd_free_dma(void) { free_dma(FLOPPY_DMA); }

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static inline void fd_clear_dma_ff(void) { clear_dma_ff(FLOPPY_DMA); }

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static inline void fd_set_dma_mode(char mode) { set_dma_mode(FLOPPY_DMA, mode); }

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static inline void fd_set_dma_addr(char *addr) { set_dma_addr(FLOPPY_DMA, (unsigned long) addr); }

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static inline void fd_set_dma_count(unsigned int count) { set_dma_count(FLOPPY_DMA, count); }

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static inline int fd_get_dma_residue(void) { return get_dma_residue(FLOPPY_DMA); }

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static inline void fd_enable_irq(void) { enable_irq(FLOPPY_IRQ); }

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static inline void fd_disable_irq(void) { disable_irq(FLOPPY_IRQ); }

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static inline int fd_request_irq(void) { return request_irq(FLOPPY_IRQ, floppy_interrupt, 0, "floppy", NULL); }

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static inline void fd_free_irq(void) { free_irq(FLOPPY_IRQ, NULL); }

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#define fd_free_irq() free_irq(FLOPPY_IRQ, NULL);
static inline unsigned long fd_getfdaddr1(void) { return 0x3f0; }

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static inline unsigned long fd_dma_mem_alloc(unsigned long size) { return __get_dma_pages(GFP_KERNEL, get_order(size)); }

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static inline void fd_dma_mem_free(unsigned long addr, unsigned long size) { free_pages(addr, get_order(size)); }

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static inline unsigned long fd_drive_type(unsigned long n) { if (n == 0) return 4; /* 3,5", 1.44mb */ return 0; }

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#endif /* __ASM_MACH_GENERIC_FLOPPY_H */

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