FreeBSD/Linux Kernel Cross Reference
sys/include/asm-alpha/jensen.h

     #ifndef __ALPHA_JENSEN_H
     #define __ALPHA_JENSEN_H
     
     #include <asm/compiler.h>
     
     /*
      * Defines for the AlphaPC EISA IO and memory address space.
      */
     
    /* The Jensen is strange */
    /* #define AUX_IRQ (9) *//* done in keyboard.h now */
    
    /*
     * NOTE! The memory operations do not set any memory barriers, as it's
     * not needed for cases like a frame buffer that is essentially memory-like.
     * You need to do them by hand if the operations depend on ordering.
     *
     * Similarly, the port IO operations do a "mb" only after a write operation:
     * if an mb is needed before (as in the case of doing memory mapped IO
     * first, and then a port IO operation to the same device), it needs to be
     * done by hand.
     *
     * After the above has bitten me 100 times, I'll give up and just do the
     * mb all the time, but right now I'm hoping this will work out.  Avoiding
     * mb's may potentially be a noticeable speed improvement, but I can't
     * honestly say I've tested it.
     *
     * Handling interrupts that need to do mb's to synchronize to non-interrupts
     * is another fun race area.  Don't do it (because if you do, I'll have to
     * do *everything* with interrupts disabled, ugh).
     */
    
    /*
     * EISA Interrupt Acknowledge address
     */
    #define EISA_INTA               (IDENT_ADDR + 0x100000000UL)
    
    /*
     * FEPROM addresses
     */
    #define EISA_FEPROM0            (IDENT_ADDR + 0x180000000UL)
    #define EISA_FEPROM1            (IDENT_ADDR + 0x1A0000000UL)
    
    /*
     * VL82C106 base address
     */
    #define EISA_VL82C106           (IDENT_ADDR + 0x1C0000000UL)
    
    /*
     * EISA "Host Address Extension" address (bits 25-31 of the EISA address)
     */
    #define EISA_HAE                (IDENT_ADDR + 0x1D0000000UL)
    
    /*
     * "SYSCTL" register address
     */
    #define EISA_SYSCTL             (IDENT_ADDR + 0x1E0000000UL)
    
    /*
     * "spare" register address
     */
    #define EISA_SPARE              (IDENT_ADDR + 0x1F0000000UL)
    
    /*
     * EISA memory address offset
     */
    #define EISA_MEM                (IDENT_ADDR + 0x200000000UL)
    
    /*
     * EISA IO address offset
     */
    #define EISA_IO                 (IDENT_ADDR + 0x300000000UL)
    
    
    #ifdef __KERNEL__
    
    #ifndef __EXTERN_INLINE
    #define __EXTERN_INLINE extern inline
    #define __IO_EXTERN_INLINE
    #endif
    
    /*
     * Handle the "host address register". This needs to be set
     * to the high 7 bits of the EISA address.  This is also needed
     * for EISA IO addresses, which are only 16 bits wide (the
     * hae needs to be set to 0).
     *
     * HAE isn't needed for the local IO operations, though.
     */
    
    #define JENSEN_HAE_ADDRESS      EISA_HAE
    #define JENSEN_HAE_MASK         0x1ffffff
    
    __EXTERN_INLINE void jensen_set_hae(unsigned long addr)
    {
            /* hae on the Jensen is bits 31:25 shifted right */
            addr >>= 25;
            if (addr != alpha_mv.hae_cache)
                    set_hae(addr);
   }
   
   #define vuip    volatile unsigned int *
   
   /*
    * IO functions
    *
    * The "local" functions are those that don't go out to the EISA bus,
    * but instead act on the VL82C106 chip directly.. This is mainly the
    * keyboard, RTC,  printer and first two serial lines..
    *
    * The local stuff makes for some complications, but it seems to be
    * gone in the PCI version. I hope I can get DEC suckered^H^H^H^H^H^H^H^H
    * convinced that I need one of the newer machines.
    */
   
   static inline unsigned int jensen_local_inb(unsigned long addr)
   {
           return 0xff & *(vuip)((addr << 9) + EISA_VL82C106);
   }
   
   static inline void jensen_local_outb(u8 b, unsigned long addr)
   {
           *(vuip)((addr << 9) + EISA_VL82C106) = b;
           mb();
   }
   
   static inline unsigned int jensen_bus_inb(unsigned long addr)
   {
           long result;
   
           jensen_set_hae(0);
           result = *(volatile int *)((addr << 7) + EISA_IO + 0x00);
           return __kernel_extbl(result, addr & 3);
   }
   
   static inline void jensen_bus_outb(u8 b, unsigned long addr)
   {
           jensen_set_hae(0);
           *(vuip)((addr << 7) + EISA_IO + 0x00) = b * 0x01010101;
           mb();
   }
   
   /*
    * It seems gcc is not very good at optimizing away logical
    * operations that result in operations across inline functions.
    * Which is why this is a macro.
    */
   
   #define jensen_is_local(addr) ( \
   /* keyboard */  (addr == 0x60 || addr == 0x64) || \
   /* RTC */       (addr == 0x170 || addr == 0x171) || \
   /* mb COM2 */   (addr >= 0x2f8 && addr <= 0x2ff) || \
   /* mb LPT1 */   (addr >= 0x3bc && addr <= 0x3be) || \
   /* mb COM2 */   (addr >= 0x3f8 && addr <= 0x3ff))
   
   __EXTERN_INLINE u8 jensen_inb(unsigned long addr)
   {
           if (jensen_is_local(addr))
                   return jensen_local_inb(addr);
           else
                   return jensen_bus_inb(addr);
   }
   
   __EXTERN_INLINE void jensen_outb(u8 b, unsigned long addr)
   {
           if (jensen_is_local(addr))
                   jensen_local_outb(b, addr);
           else
                   jensen_bus_outb(b, addr);
   }
   
   __EXTERN_INLINE u16 jensen_inw(unsigned long addr)
   {
           long result;
   
           jensen_set_hae(0);
           result = *(volatile int *) ((addr << 7) + EISA_IO + 0x20);
           result >>= (addr & 3) * 8;
           return 0xffffUL & result;
   }
   
   __EXTERN_INLINE u32 jensen_inl(unsigned long addr)
   {
           jensen_set_hae(0);
           return *(vuip) ((addr << 7) + EISA_IO + 0x60);
   }
   
   __EXTERN_INLINE void jensen_outw(u16 b, unsigned long addr)
   {
           jensen_set_hae(0);
           *(vuip) ((addr << 7) + EISA_IO + 0x20) = b * 0x00010001;
           mb();
   }
   
   __EXTERN_INLINE void jensen_outl(u32 b, unsigned long addr)
   {
           jensen_set_hae(0);
           *(vuip) ((addr << 7) + EISA_IO + 0x60) = b;
           mb();
   }
   
   /*
    * Memory functions.
    */
   
   __EXTERN_INLINE u8 jensen_readb(unsigned long addr)
   {
           long result;
   
           jensen_set_hae(addr);
           addr &= JENSEN_HAE_MASK;
           result = *(volatile int *) ((addr << 7) + EISA_MEM + 0x00);
           result >>= (addr & 3) * 8;
           return 0xffUL & result;
   }
   
   __EXTERN_INLINE u16 jensen_readw(unsigned long addr)
   {
           long result;
   
           jensen_set_hae(addr);
           addr &= JENSEN_HAE_MASK;
           result = *(volatile int *) ((addr << 7) + EISA_MEM + 0x20);
           result >>= (addr & 3) * 8;
           return 0xffffUL & result;
   }
   
   __EXTERN_INLINE u32 jensen_readl(unsigned long addr)
   {
           jensen_set_hae(addr);
           addr &= JENSEN_HAE_MASK;
           return *(vuip) ((addr << 7) + EISA_MEM + 0x60);
   }
   
   __EXTERN_INLINE u64 jensen_readq(unsigned long addr)
   {
           unsigned long r0, r1;
   
           jensen_set_hae(addr);
           addr &= JENSEN_HAE_MASK;
           addr = (addr << 7) + EISA_MEM + 0x60;
           r0 = *(vuip) (addr);
           r1 = *(vuip) (addr + (4 << 7));
           return r1 << 32 | r0;
   }
   
   __EXTERN_INLINE void jensen_writeb(u8 b, unsigned long addr)
   {
           jensen_set_hae(addr);
           addr &= JENSEN_HAE_MASK;
           *(vuip) ((addr << 7) + EISA_MEM + 0x00) = b * 0x01010101;
   }
   
   __EXTERN_INLINE void jensen_writew(u16 b, unsigned long addr)
   {
           jensen_set_hae(addr);
           addr &= JENSEN_HAE_MASK;
           *(vuip) ((addr << 7) + EISA_MEM + 0x20) = b * 0x00010001;
   }
   
   __EXTERN_INLINE void jensen_writel(u32 b, unsigned long addr)
   {
           jensen_set_hae(addr);
           addr &= JENSEN_HAE_MASK;
           *(vuip) ((addr << 7) + EISA_MEM + 0x60) = b;
   }
   
   __EXTERN_INLINE void jensen_writeq(u64 b, unsigned long addr)
   {
           jensen_set_hae(addr);
           addr &= JENSEN_HAE_MASK;
           addr = (addr << 7) + EISA_MEM + 0x60;
           *(vuip) (addr) = b;
           *(vuip) (addr + (4 << 7)) = b >> 32;
   }
   
   __EXTERN_INLINE unsigned long jensen_ioremap(unsigned long addr, 
                                                unsigned long size)
   {
           return addr;
   }
   
   __EXTERN_INLINE void jensen_iounmap(unsigned long addr)
   {
           return;
   }
   
   __EXTERN_INLINE int jensen_is_ioaddr(unsigned long addr)
   {
           return (long)addr >= 0;
   }
   
   #undef vuip
   
   #ifdef __WANT_IO_DEF
   
   #define __inb           jensen_inb
   #define __inw           jensen_inw
   #define __inl           jensen_inl
   #define __outb          jensen_outb
   #define __outw          jensen_outw
   #define __outl          jensen_outl
   #define __readb         jensen_readb
   #define __readw         jensen_readw
   #define __writeb        jensen_writeb
   #define __writew        jensen_writew
   #define __readl         jensen_readl
   #define __readq         jensen_readq
   #define __writel        jensen_writel
   #define __writeq        jensen_writeq
   #define __ioremap       jensen_ioremap
   #define __iounmap(a)    jensen_iounmap((unsigned long)a)
   #define __is_ioaddr     jensen_is_ioaddr
   
   /*
    * The above have so much overhead that it probably doesn't make
    * sense to have them inlined (better icache behaviour).
    */
   #define inb(port) \
   (__builtin_constant_p((port))?__inb(port):_inb(port))
   
   #define outb(x, port) \
   (__builtin_constant_p((port))?__outb((x),(port)):_outb((x),(port)))
   
   #endif /* __WANT_IO_DEF */
   
   #ifdef __IO_EXTERN_INLINE
   #undef __EXTERN_INLINE
   #undef __IO_EXTERN_INLINE
   #endif
   
   #endif /* __KERNEL__ */
   
   #endif /* __ALPHA_JENSEN_H */

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