FreeBSD/Linux Kernel Cross Reference
sys/lib/iomap.c

     /*
      * Implement the default iomap interfaces
      *
      * (C) Copyright 2004 Linus Torvalds
      */
     #include <linux/pci.h>
     #include <linux/io.h>
     
     #include <linux/export.h>
    
    /*
     * Read/write from/to an (offsettable) iomem cookie. It might be a PIO
     * access or a MMIO access, these functions don't care. The info is
     * encoded in the hardware mapping set up by the mapping functions
     * (or the cookie itself, depending on implementation and hw).
     *
     * The generic routines don't assume any hardware mappings, and just
     * encode the PIO/MMIO as part of the cookie. They coldly assume that
     * the MMIO IO mappings are not in the low address range.
     *
     * Architectures for which this is not true can't use this generic
     * implementation and should do their own copy.
     */
    
    #ifndef HAVE_ARCH_PIO_SIZE
    /*
     * We encode the physical PIO addresses (0-0xffff) into the
     * pointer by offsetting them with a constant (0x10000) and
     * assuming that all the low addresses are always PIO. That means
     * we can do some sanity checks on the low bits, and don't
     * need to just take things for granted.
     */
    #define PIO_OFFSET      0x10000UL
    #define PIO_MASK        0x0ffffUL
    #define PIO_RESERVED    0x40000UL
    #endif
    
    static void bad_io_access(unsigned long port, const char *access)
    {
            static int count = 10;
            if (count) {
                    count--;
                    WARN(1, KERN_ERR "Bad IO access at port %#lx (%s)\n", port, access);
            }
    }
    
    /*
     * Ugly macros are a way of life.
     */
    #define IO_COND(addr, is_pio, is_mmio) do {                     \
            unsigned long port = (unsigned long __force)addr;       \
            if (port >= PIO_RESERVED) {                             \
                    is_mmio;                                        \
            } else if (port > PIO_OFFSET) {                         \
                    port &= PIO_MASK;                               \
                    is_pio;                                         \
            } else                                                  \
                    bad_io_access(port, #is_pio );                  \
    } while (0)
    
    #ifndef pio_read16be
    #define pio_read16be(port) swab16(inw(port))
    #define pio_read32be(port) swab32(inl(port))
    #endif
    
    #ifndef mmio_read16be
    #define mmio_read16be(addr) be16_to_cpu(__raw_readw(addr))
    #define mmio_read32be(addr) be32_to_cpu(__raw_readl(addr))
    #endif
    
    unsigned int ioread8(void __iomem *addr)
    {
            IO_COND(addr, return inb(port), return readb(addr));
            return 0xff;
    }
    unsigned int ioread16(void __iomem *addr)
    {
            IO_COND(addr, return inw(port), return readw(addr));
            return 0xffff;
    }
    unsigned int ioread16be(void __iomem *addr)
    {
            IO_COND(addr, return pio_read16be(port), return mmio_read16be(addr));
            return 0xffff;
    }
    unsigned int ioread32(void __iomem *addr)
    {
            IO_COND(addr, return inl(port), return readl(addr));
            return 0xffffffff;
    }
    unsigned int ioread32be(void __iomem *addr)
    {
            IO_COND(addr, return pio_read32be(port), return mmio_read32be(addr));
            return 0xffffffff;
    }
    EXPORT_SYMBOL(ioread8);
    EXPORT_SYMBOL(ioread16);
    EXPORT_SYMBOL(ioread16be);
    EXPORT_SYMBOL(ioread32);
   EXPORT_SYMBOL(ioread32be);
   
   #ifndef pio_write16be
   #define pio_write16be(val,port) outw(swab16(val),port)
   #define pio_write32be(val,port) outl(swab32(val),port)
   #endif
   
   #ifndef mmio_write16be
   #define mmio_write16be(val,port) __raw_writew(be16_to_cpu(val),port)
   #define mmio_write32be(val,port) __raw_writel(be32_to_cpu(val),port)
   #endif
   
   void iowrite8(u8 val, void __iomem *addr)
   {
           IO_COND(addr, outb(val,port), writeb(val, addr));
   }
   void iowrite16(u16 val, void __iomem *addr)
   {
           IO_COND(addr, outw(val,port), writew(val, addr));
   }
   void iowrite16be(u16 val, void __iomem *addr)
   {
           IO_COND(addr, pio_write16be(val,port), mmio_write16be(val, addr));
   }
   void iowrite32(u32 val, void __iomem *addr)
   {
           IO_COND(addr, outl(val,port), writel(val, addr));
   }
   void iowrite32be(u32 val, void __iomem *addr)
   {
           IO_COND(addr, pio_write32be(val,port), mmio_write32be(val, addr));
   }
   EXPORT_SYMBOL(iowrite8);
   EXPORT_SYMBOL(iowrite16);
   EXPORT_SYMBOL(iowrite16be);
   EXPORT_SYMBOL(iowrite32);
   EXPORT_SYMBOL(iowrite32be);
   
   /*
    * These are the "repeat MMIO read/write" functions.
    * Note the "__raw" accesses, since we don't want to
    * convert to CPU byte order. We write in "IO byte
    * order" (we also don't have IO barriers).
    */
   #ifndef mmio_insb
   static inline void mmio_insb(void __iomem *addr, u8 *dst, int count)
   {
           while (--count >= 0) {
                   u8 data = __raw_readb(addr);
                   *dst = data;
                   dst++;
           }
   }
   static inline void mmio_insw(void __iomem *addr, u16 *dst, int count)
   {
           while (--count >= 0) {
                   u16 data = __raw_readw(addr);
                   *dst = data;
                   dst++;
           }
   }
   static inline void mmio_insl(void __iomem *addr, u32 *dst, int count)
   {
           while (--count >= 0) {
                   u32 data = __raw_readl(addr);
                   *dst = data;
                   dst++;
           }
   }
   #endif
   
   #ifndef mmio_outsb
   static inline void mmio_outsb(void __iomem *addr, const u8 *src, int count)
   {
           while (--count >= 0) {
                   __raw_writeb(*src, addr);
                   src++;
           }
   }
   static inline void mmio_outsw(void __iomem *addr, const u16 *src, int count)
   {
           while (--count >= 0) {
                   __raw_writew(*src, addr);
                   src++;
           }
   }
   static inline void mmio_outsl(void __iomem *addr, const u32 *src, int count)
   {
           while (--count >= 0) {
                   __raw_writel(*src, addr);
                   src++;
           }
   }
   #endif
   
   void ioread8_rep(void __iomem *addr, void *dst, unsigned long count)
   {
           IO_COND(addr, insb(port,dst,count), mmio_insb(addr, dst, count));
   }
   void ioread16_rep(void __iomem *addr, void *dst, unsigned long count)
   {
           IO_COND(addr, insw(port,dst,count), mmio_insw(addr, dst, count));
   }
   void ioread32_rep(void __iomem *addr, void *dst, unsigned long count)
   {
           IO_COND(addr, insl(port,dst,count), mmio_insl(addr, dst, count));
   }
   EXPORT_SYMBOL(ioread8_rep);
   EXPORT_SYMBOL(ioread16_rep);
   EXPORT_SYMBOL(ioread32_rep);
   
   void iowrite8_rep(void __iomem *addr, const void *src, unsigned long count)
   {
           IO_COND(addr, outsb(port, src, count), mmio_outsb(addr, src, count));
   }
   void iowrite16_rep(void __iomem *addr, const void *src, unsigned long count)
   {
           IO_COND(addr, outsw(port, src, count), mmio_outsw(addr, src, count));
   }
   void iowrite32_rep(void __iomem *addr, const void *src, unsigned long count)
   {
           IO_COND(addr, outsl(port, src,count), mmio_outsl(addr, src, count));
   }
   EXPORT_SYMBOL(iowrite8_rep);
   EXPORT_SYMBOL(iowrite16_rep);
   EXPORT_SYMBOL(iowrite32_rep);
   
   #ifdef CONFIG_HAS_IOPORT
   /* Create a virtual mapping cookie for an IO port range */
   void __iomem *ioport_map(unsigned long port, unsigned int nr)
   {
           if (port > PIO_MASK)
                   return NULL;
           return (void __iomem *) (unsigned long) (port + PIO_OFFSET);
   }
   
   void ioport_unmap(void __iomem *addr)
   {
           /* Nothing to do */
   }
   EXPORT_SYMBOL(ioport_map);
   EXPORT_SYMBOL(ioport_unmap);
   #endif /* CONFIG_HAS_IOPORT */
   
   #ifdef CONFIG_PCI
   /* Hide the details if this is a MMIO or PIO address space and just do what
    * you expect in the correct way. */
   void pci_iounmap(struct pci_dev *dev, void __iomem * addr)
   {
           IO_COND(addr, /* nothing */, iounmap(addr));
   }
   EXPORT_SYMBOL(pci_iounmap);
   #endif /* CONFIG_PCI */

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