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(base, reg)               inb_p((base) + (reg))
  15#define fd_outb(value, base, reg)       outb_p(value, (base) + (reg))
  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 */
 114