Linux Cross Reference
Linux/include/asm-m68k/floppy.h

   /*
    * Q40 Architecture specific parts of the Floppy driver
    *
    * This file is subject to the terms and conditions of the GNU General Public
    * License.  See the file "COPYING" in the main directory of this archive
    * for more details.
    *
    * Copyright (C) 1999
    */
  
  #include <asm/io.h>
  
  #include <linux/vmalloc.h>
  
  
  asmlinkage void floppy_hardint(int irq, void *dev_id, struct pt_regs * regs);
  
  #undef MAX_DMA_ADDRESS
  #define MAX_DMA_ADDRESS   0x00  /* nothing like that */
  
  extern spinlock_t  dma_spin_lock;
  
  static __inline__ unsigned long claim_dma_lock(void)
  {
          unsigned long flags;
          spin_lock_irqsave(&dma_spin_lock, flags);
          return flags;
  }
  
  static __inline__ void release_dma_lock(unsigned long flags)
  {
          spin_unlock_irqrestore(&dma_spin_lock, flags);
  }
  
  
  
  #define fd_inb(port)                    inb_p(port)
  #define fd_outb(port,value)             outb_p(port,value)
  
  
  #define fd_request_dma()        vdma_request_dma(FLOPPY_DMA,"floppy")
  /*#define fd_free_dma()           */
  
  
  #define fd_get_dma_residue()    vdma_get_dma_residue(FLOPPY_DMA)
  #define fd_dma_mem_alloc(size)  vdma_mem_alloc(size)
  #define fd_dma_setup(addr, size, mode, io) vdma_dma_setup(addr, size, mode, io)
  
  
  #define fd_enable_irq()           /* nothing... */
  #define fd_disable_irq()          /* nothing... */
  #define fd_free_irq()           free_irq(FLOPPY_IRQ, NULL)
  
  #define fd_free_dma()             /* nothing */
  
  /* No 64k boundary crossing problems on Q40 - no DMA at all */
  #define CROSS_64KB(a,s) (0)
  
  #define DMA_MODE_READ  0x44    /* i386 look-alike */
  #define DMA_MODE_WRITE 0x48
  
  
  static int q40_floppy_init(void)
  {
    use_virtual_dma =1;
    /* FLOPPY_IRQ=6; */
  
    if (MACH_IS_Q40)  
      return 0x3f0;
    else
      return -1;
  }
  
  
  
  
  /*
   * Again, the CMOS information doesn't work on the Q40..
   */
  #define FLOPPY0_TYPE 6
  #define FLOPPY1_TYPE 0
  
  
  
  
  #define FLOPPY_MOTOR_MASK 0xf0
  
  
  
  
  /* basically PC init + set use_virtual_dma */
  #define  FDC1 q40_floppy_init()
  static int FDC2 = -1;
  
  
  #define N_FDC 1
  #define N_DRIVE 8
  
  
 
 /* vdma stuff adapted from asm-i386/floppy.h */
 
 static int virtual_dma_count=0;
 static int virtual_dma_residue=0;
 static char *virtual_dma_addr=0;
 static int virtual_dma_mode=0;
 static int doing_pdma=0;
 
 
 
 static int fd_request_irq(void)
 {
   return request_irq(FLOPPY_IRQ, floppy_hardint,SA_INTERRUPT,
                                                    "floppy", NULL);
 }
 
 /*#define SLOW_DOWN do{outb(0,0x80);}while(0)*/
 #define SLOW_DOWN do{int count=1;do{if(!jiffies)break;}while(count-->0);}while(0)
 
 asmlinkage void floppy_hardint(int irq, void *dev_id, struct pt_regs * regs)
 {
         register unsigned char st;
 
 #undef TRACE_FLPY_INT
 #define NO_FLOPPY_ASSEMBLER
 
 #ifdef TRACE_FLPY_INT 
         static int calls=0;
         static int bytes=0;
         static int dma_wait=0;
 #endif
         if(!doing_pdma) {
                 floppy_interrupt(irq, dev_id, regs);
                 return;
         }
 
 #ifdef TRACE_FLPY_INT
         if(!calls)
                 bytes = virtual_dma_count;
 #endif
 
         {
                 register int lcount;
                 register char *lptr;
 
                 /* serve 1st byte fast: */
 
                 st=1;
                 for(lcount=virtual_dma_count, lptr=virtual_dma_addr; 
                     lcount; lcount--, lptr++) {
                         st=inb(virtual_dma_port+4) & 0xa0 ;
                         if(st != 0xa0) 
                                 break;
                         if(virtual_dma_mode)
                                 outb_p(*lptr, virtual_dma_port+5);
                         else
                                 *lptr = inb_p(virtual_dma_port+5);
                 }
 
                 virtual_dma_count = lcount;
                 virtual_dma_addr = lptr;
                 st = inb(virtual_dma_port+4);
         }
 
 #ifdef TRACE_FLPY_INT
         calls++;
 #endif
         if(st == 0x20)
                 return;
         if(!(st & 0x20)) {
                 virtual_dma_residue += virtual_dma_count;
                 virtual_dma_count=0;
 #ifdef TRACE_FLPY_INT
                 printk("count=%x, residue=%x calls=%d bytes=%d dma_wait=%d\n", 
                        virtual_dma_count, virtual_dma_residue, calls, bytes,
                        dma_wait);
                 calls = 0;
                 dma_wait=0;
 #endif
                 doing_pdma = 0;
                 floppy_interrupt(irq, dev_id, regs);
                 return;
         }
 #ifdef TRACE_FLPY_INT
         if(!virtual_dma_count)
                 dma_wait++;
 #endif
 }
 
 
 
 static int vdma_request_dma(unsigned int dmanr, const char * device_id)
 {
         return 0;
 }
 
 
 static int vdma_get_dma_residue(unsigned int dummy)
 {
         return virtual_dma_count + virtual_dma_residue;
 }
 
 
 static unsigned long vdma_mem_alloc(unsigned long size)
 {
         return (unsigned long) vmalloc(size);
 
 }
 
 static void _fd_dma_mem_free(unsigned long addr, unsigned long size)
 {
         vfree((void *)addr);
 }
 #define fd_dma_mem_free(addr,size) _fd_dma_mem_free(addr, size)
 
 
 /* choose_dma_mode ???*/
 
 static int vdma_dma_setup(char *addr, unsigned long size, int mode, int io)
 {
         doing_pdma = 1;
         virtual_dma_port = io;
         virtual_dma_mode = (mode  == DMA_MODE_WRITE);
         virtual_dma_addr = addr;
         virtual_dma_count = size;
         virtual_dma_residue = 0;
         return 0;
 }
 
 
 
 static void fd_disable_dma(void)
 {
         doing_pdma = 0;
         virtual_dma_residue += virtual_dma_count;
         virtual_dma_count=0;
 }