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

INCLUDED FROM

DEFINITIONS

1. alpha_fd_dma_setup
2. virtual_dma_init
3. CROSS_64KB

   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 
  37 static __inline__ int 
  38 alpha_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 
  80 static int FDC1 = 0x3f0;
  81 static 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 
 105 static 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 */