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torvalds
GitHub Repository: torvalds/linux
 Path: blob/master/arch/alpha/include/asm/floppy.h
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/*

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 * Architecture specific parts of the Floppy driver

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 *

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 * This file is subject to the terms and conditions of the GNU General Public

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 * License.  See the file "COPYING" in the main directory of this archive

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 * for more details.

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 *

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 * Copyright (C) 1995

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 */

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#ifndef __ASM_ALPHA_FLOPPY_H

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#define __ASM_ALPHA_FLOPPY_H

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#define fd_inb(base, reg)		inb_p((base) + (reg))

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#define fd_outb(value, base, reg)	outb_p(value, (base) + (reg))

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#define fd_enable_dma()         enable_dma(FLOPPY_DMA)

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#define fd_disable_dma()        disable_dma(FLOPPY_DMA)

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#define fd_request_dma()        request_dma(FLOPPY_DMA,"floppy")

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#define fd_free_dma()           free_dma(FLOPPY_DMA)

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#define fd_clear_dma_ff()       clear_dma_ff(FLOPPY_DMA)

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#define fd_set_dma_mode(mode)   set_dma_mode(FLOPPY_DMA,mode)

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#define fd_set_dma_addr(addr)   set_dma_addr(FLOPPY_DMA,isa_virt_to_bus(addr))

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#define fd_set_dma_count(count) set_dma_count(FLOPPY_DMA,count)

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#define fd_enable_irq()         enable_irq(FLOPPY_IRQ)

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#define fd_disable_irq()        disable_irq(FLOPPY_IRQ)

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#define fd_request_irq()        request_irq(FLOPPY_IRQ, floppy_interrupt,\

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					    0, "floppy", NULL)

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#define fd_free_irq()           free_irq(FLOPPY_IRQ, NULL)

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#ifdef CONFIG_PCI

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#include <linux/pci.h>

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#define fd_dma_setup(addr,size,mode,io) alpha_fd_dma_setup(addr,size,mode,io)

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static __inline__ int 

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alpha_fd_dma_setup(char *addr, unsigned long size, int mode, int io)

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{

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	static unsigned long prev_size;

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	static dma_addr_t bus_addr = 0;

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	static char *prev_addr;

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	static int prev_dir;

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	int dir;

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	dir = (mode != DMA_MODE_READ) ? DMA_FROM_DEVICE : DMA_TO_DEVICE;

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	if (bus_addr 

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	    && (addr != prev_addr || size != prev_size || dir != prev_dir)) {

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		/* different from last time -- unmap prev */

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		dma_unmap_single(&isa_bridge->dev, bus_addr, prev_size,

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				 prev_dir);

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		bus_addr = 0;

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	}

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	if (!bus_addr)	/* need to map it */

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		bus_addr = dma_map_single(&isa_bridge->dev, addr, size, dir);

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	/* remember this one as prev */

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	prev_addr = addr;

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	prev_size = size;

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	prev_dir = dir;

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	fd_clear_dma_ff();

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	fd_set_dma_mode(mode);

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	set_dma_addr(FLOPPY_DMA, bus_addr);

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	fd_set_dma_count(size);

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	virtual_dma_port = io;

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	fd_enable_dma();

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	return 0;

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}

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#endif /* CONFIG_PCI */

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__inline__ void virtual_dma_init(void)

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{

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	/* Nothing to do on an Alpha */

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}

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static int FDC1 = 0x3f0;

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static int FDC2 = -1;

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/*

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 * Again, the CMOS information doesn't work on the alpha..

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 */

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#define FLOPPY0_TYPE 6

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#define FLOPPY1_TYPE 0

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#define N_FDC 2

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#define N_DRIVE 8

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/*

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 * Most Alphas have no problems with floppy DMA crossing 64k borders,

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 * except for certain ones, like XL and RUFFIAN.

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 *

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 * However, the test is simple and fast, and this *is* floppy, after all,

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 * so we do it for all platforms, just to make sure.

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 *

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 * This is advantageous in other circumstances as well, as in moving

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 * about the PCI DMA windows and forcing the floppy to start doing

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 * scatter-gather when it never had before, and there *is* a problem

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 * on that platform... ;-}

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 */

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static inline unsigned long CROSS_64KB(void *a, unsigned long s)

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{

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	unsigned long p = (unsigned long)a;

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	return ((p + s - 1) ^ p) & ~0xffffUL;

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}

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#define EXTRA_FLOPPY_PARAMS

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#endif /* __ASM_ALPHA_FLOPPY_H */

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