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

   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_cacheflush(addr,size) /* nothing */
  28#define fd_request_irq()        request_irq(FLOPPY_IRQ, floppy_interrupt,\
  29                                            0, "floppy", NULL)
  30#define fd_free_irq()           free_irq(FLOPPY_IRQ, NULL)
  31
  32#ifdef CONFIG_PCI
  33
  34#include <linux/pci.h>
  35
  36#define fd_dma_setup(addr,size,mode,io) alpha_fd_dma_setup(addr,size,mode,io)
  37
  38static __inline__ int 
  39alpha_fd_dma_setup(char *addr, unsigned long size, int mode, int io)
  40{
  41        static unsigned long prev_size;
  42        static dma_addr_t bus_addr = 0;
  43        static char *prev_addr;
  44        static int prev_dir;
  45        int dir;
  46
  47        dir = (mode != DMA_MODE_READ) ? PCI_DMA_FROMDEVICE : PCI_DMA_TODEVICE;
  48
  49        if (bus_addr 
  50            && (addr != prev_addr || size != prev_size || dir != prev_dir)) {
  51                /* different from last time -- unmap prev */
  52                pci_unmap_single(isa_bridge, bus_addr, prev_size, prev_dir);
  53                bus_addr = 0;
  54        }
  55
  56        if (!bus_addr)  /* need to map it */
  57                bus_addr = pci_map_single(isa_bridge, addr, size, dir);
  58
  59        /* remember this one as prev */
  60        prev_addr = addr;
  61        prev_size = size;
  62        prev_dir = dir;
  63
  64        fd_clear_dma_ff();
  65        fd_cacheflush(addr, size);
  66        fd_set_dma_mode(mode);
  67        set_dma_addr(FLOPPY_DMA, bus_addr);
  68        fd_set_dma_count(size);
  69        virtual_dma_port = io;
  70        fd_enable_dma();
  71
  72        return 0;
  73}
  74
  75#endif /* CONFIG_PCI */
  76
  77__inline__ void virtual_dma_init(void)
  78{
  79        /* Nothing to do on an Alpha */
  80}
  81
  82static int FDC1 = 0x3f0;
  83static int FDC2 = -1;
  84
  85/*
  86 * Again, the CMOS information doesn't work on the alpha..
  87 */
  88#define FLOPPY0_TYPE 6
  89#define FLOPPY1_TYPE 0
  90
  91#define N_FDC 2
  92#define N_DRIVE 8
  93
  94/*
  95 * Most Alphas have no problems with floppy DMA crossing 64k borders,
  96 * except for certain ones, like XL and RUFFIAN.
  97 *
  98 * However, the test is simple and fast, and this *is* floppy, after all,
  99 * so we do it for all platforms, just to make sure.
 100 *
 101 * This is advantageous in other circumstances as well, as in moving
 102 * about the PCI DMA windows and forcing the floppy to start doing
 103 * scatter-gather when it never had before, and there *is* a problem
 104 * on that platform... ;-}
 105 */
 106
 107static inline unsigned long CROSS_64KB(void *a, unsigned long s)
 108{
 109        unsigned long p = (unsigned long)a;
 110        return ((p + s - 1) ^ p) & ~0xffffUL;
 111}
 112
 113#define EXTRA_FLOPPY_PARAMS
 114
 115#endif /* __ASM_ALPHA_FLOPPY_H */
 116