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/arch/alpha/include/asm/floppy.h

http://github.com/mirrors/linux
C Header | 113 lines | 64 code | 22 blank | 27 comment | 9 complexity | aa478c6cf822ba09bd1cbc9b391f6da1 MD5 | raw file
  1/*
  2 * Architecture specific parts of the Floppy driver
  3 *
  4 * This file is subject to the terms and conditions of the GNU General Public
  5 * License.  See the file "COPYING" in the main directory of this archive
  6 * for more details.
  7 *
  8 * Copyright (C) 1995
  9 */
 10#ifndef __ASM_ALPHA_FLOPPY_H
 11#define __ASM_ALPHA_FLOPPY_H
 12
 13
 14#define fd_inb(port)			inb_p(port)
 15#define fd_outb(value,port)		outb_p(value,port)
 16
 17#define fd_enable_dma()         enable_dma(FLOPPY_DMA)
 18#define fd_disable_dma()        disable_dma(FLOPPY_DMA)
 19#define fd_request_dma()        request_dma(FLOPPY_DMA,"floppy")
 20#define fd_free_dma()           free_dma(FLOPPY_DMA)
 21#define fd_clear_dma_ff()       clear_dma_ff(FLOPPY_DMA)
 22#define fd_set_dma_mode(mode)   set_dma_mode(FLOPPY_DMA,mode)
 23#define fd_set_dma_addr(addr)   set_dma_addr(FLOPPY_DMA,virt_to_bus(addr))
 24#define fd_set_dma_count(count) set_dma_count(FLOPPY_DMA,count)
 25#define fd_enable_irq()         enable_irq(FLOPPY_IRQ)
 26#define fd_disable_irq()        disable_irq(FLOPPY_IRQ)
 27#define fd_request_irq()        request_irq(FLOPPY_IRQ, floppy_interrupt,\
 28					    0, "floppy", NULL)
 29#define fd_free_irq()           free_irq(FLOPPY_IRQ, NULL)
 30
 31#ifdef CONFIG_PCI
 32
 33#include <linux/pci.h>
 34
 35#define fd_dma_setup(addr,size,mode,io) alpha_fd_dma_setup(addr,size,mode,io)
 36
 37static __inline__ int 
 38alpha_fd_dma_setup(char *addr, unsigned long size, int mode, int io)
 39{
 40	static unsigned long prev_size;
 41	static dma_addr_t bus_addr = 0;
 42	static char *prev_addr;
 43	static int prev_dir;
 44	int dir;
 45
 46	dir = (mode != DMA_MODE_READ) ? PCI_DMA_FROMDEVICE : PCI_DMA_TODEVICE;
 47
 48	if (bus_addr 
 49	    && (addr != prev_addr || size != prev_size || dir != prev_dir)) {
 50		/* different from last time -- unmap prev */
 51		pci_unmap_single(isa_bridge, bus_addr, prev_size, prev_dir);
 52		bus_addr = 0;
 53	}
 54
 55	if (!bus_addr)	/* need to map it */
 56		bus_addr = pci_map_single(isa_bridge, addr, size, dir);
 57
 58	/* remember this one as prev */
 59	prev_addr = addr;
 60	prev_size = size;
 61	prev_dir = dir;
 62
 63	fd_clear_dma_ff();
 64	fd_set_dma_mode(mode);
 65	set_dma_addr(FLOPPY_DMA, bus_addr);
 66	fd_set_dma_count(size);
 67	virtual_dma_port = io;
 68	fd_enable_dma();
 69
 70	return 0;
 71}
 72
 73#endif /* CONFIG_PCI */
 74
 75__inline__ void virtual_dma_init(void)
 76{
 77	/* Nothing to do on an Alpha */
 78}
 79
 80static int FDC1 = 0x3f0;
 81static int FDC2 = -1;
 82
 83/*
 84 * Again, the CMOS information doesn't work on the alpha..
 85 */
 86#define FLOPPY0_TYPE 6
 87#define FLOPPY1_TYPE 0
 88
 89#define N_FDC 2
 90#define N_DRIVE 8
 91
 92/*
 93 * Most Alphas have no problems with floppy DMA crossing 64k borders,
 94 * except for certain ones, like XL and RUFFIAN.
 95 *
 96 * However, the test is simple and fast, and this *is* floppy, after all,
 97 * so we do it for all platforms, just to make sure.
 98 *
 99 * This is advantageous in other circumstances as well, as in moving
100 * about the PCI DMA windows and forcing the floppy to start doing
101 * scatter-gather when it never had before, and there *is* a problem
102 * on that platform... ;-}
103 */
104
105static inline unsigned long CROSS_64KB(void *a, unsigned long s)
106{
107	unsigned long p = (unsigned long)a;
108	return ((p + s - 1) ^ p) & ~0xffffUL;
109}
110
111#define EXTRA_FLOPPY_PARAMS
112
113#endif /* __ASM_ALPHA_FLOPPY_H */