[linux-2.6.git] / include / asm-sh / io.h

#ifndef __ASM_SH_IO_H
#define __ASM_SH_IO_H

/*
 * Convention:
 *    read{b,w,l}/write{b,w,l} are for PCI,
 *    while in{b,w,l}/out{b,w,l} are for ISA
 * These may (will) be platform specific function.
 * In addition we have 'pausing' versions: in{b,w,l}_p/out{b,w,l}_p
 * and 'string' versions: ins{b,w,l}/outs{b,w,l}
 * For read{b,w,l} and write{b,w,l} there are also __raw versions, which
 * do not have a memory barrier after them.
 *
 * In addition, we have
 *   ctrl_in{b,w,l}/ctrl_out{b,w,l} for SuperH specific I/O.
 *   which are processor specific.
 */

/*
 * We follow the Alpha convention here:
 *  __inb expands to an inline function call (which calls via the mv)
 *  _inb  is a real function call (note ___raw fns are _ version of __raw)
 *  inb   by default expands to _inb, but the machine specific code may
 *        define it to __inb if it chooses.
 */
#include <linux/config.h>
#include <asm/cache.h>
#include <asm/system.h>
#include <asm/addrspace.h>
#include <asm/machvec.h>
#include <asm/pgtable.h>
#include <asm-generic/iomap.h>

#ifdef __KERNEL__

/*
 * Depending on which platform we are running on, we need different
 * I/O functions.
 */
#define __IO_PREFIX     generic
#include <asm/io_generic.h>

#define maybebadio(port) \
  printk(KERN_ERR "bad PC-like io %s:%u for port 0x%lx at 0x%08x\n", \
         __FUNCTION__, __LINE__, (port), (u32)__builtin_return_address(0))

/*
 * Since boards are able to define their own set of I/O routines through
 * their respective machine vector, we always wrap through the mv.
 *
 * Also, in the event that a board hasn't provided its own definition for
 * a given routine, it will be wrapped to generic code at run-time.
 */

#define __inb(p)        sh_mv.mv_inb((p))
#define __inw(p)        sh_mv.mv_inw((p))
#define __inl(p)        sh_mv.mv_inl((p))
#define __outb(x,p)     sh_mv.mv_outb((x),(p))
#define __outw(x,p)     sh_mv.mv_outw((x),(p))
#define __outl(x,p)     sh_mv.mv_outl((x),(p))

#define __inb_p(p)      sh_mv.mv_inb_p((p))
#define __inw_p(p)      sh_mv.mv_inw_p((p))
#define __inl_p(p)      sh_mv.mv_inl_p((p))
#define __outb_p(x,p)   sh_mv.mv_outb_p((x),(p))
#define __outw_p(x,p)   sh_mv.mv_outw_p((x),(p))
#define __outl_p(x,p)   sh_mv.mv_outl_p((x),(p))

#define __insb(p,b,c)   sh_mv.mv_insb((p), (b), (c))
#define __insw(p,b,c)   sh_mv.mv_insw((p), (b), (c))
#define __insl(p,b,c)   sh_mv.mv_insl((p), (b), (c))
#define __outsb(p,b,c)  sh_mv.mv_outsb((p), (b), (c))
#define __outsw(p,b,c)  sh_mv.mv_outsw((p), (b), (c))
#define __outsl(p,b,c)  sh_mv.mv_outsl((p), (b), (c))

#define __readb(a)      sh_mv.mv_readb((a))
#define __readw(a)      sh_mv.mv_readw((a))
#define __readl(a)      sh_mv.mv_readl((a))
#define __writeb(v,a)   sh_mv.mv_writeb((v),(a))
#define __writew(v,a)   sh_mv.mv_writew((v),(a))
#define __writel(v,a)   sh_mv.mv_writel((v),(a))

#define inb             __inb
#define inw             __inw
#define inl             __inl
#define outb            __outb
#define outw            __outw
#define outl            __outl

#define inb_p           __inb_p
#define inw_p           __inw_p
#define inl_p           __inl_p
#define outb_p          __outb_p
#define outw_p          __outw_p
#define outl_p          __outl_p

#define insb            __insb
#define insw            __insw
#define insl            __insl
#define outsb           __outsb
#define outsw           __outsw
#define outsl           __outsl

#define __raw_readb(a)          __readb((void __iomem *)(a))
#define __raw_readw(a)          __readw((void __iomem *)(a))
#define __raw_readl(a)          __readl((void __iomem *)(a))
#define __raw_writeb(v, a)      __writeb(v, (void __iomem *)(a))
#define __raw_writew(v, a)      __writew(v, (void __iomem *)(a))
#define __raw_writel(v, a)      __writel(v, (void __iomem *)(a))

/*
 * The platform header files may define some of these macros to use
 * the inlined versions where appropriate.  These macros may also be
 * redefined by userlevel programs.
 */
#ifdef __readb
# define readb(a)       ({ unsigned long r_ = __raw_readb(a); mb(); r_; })
#endif
#ifdef __raw_readw
# define readw(a)       ({ unsigned long r_ = __raw_readw(a); mb(); r_; })
#endif
#ifdef __raw_readl
# define readl(a)       ({ unsigned long r_ = __raw_readl(a); mb(); r_; })
#endif

#ifdef __raw_writeb
# define writeb(v,a)    ({ __raw_writeb((v),(a)); mb(); })
#endif
#ifdef __raw_writew
# define writew(v,a)    ({ __raw_writew((v),(a)); mb(); })
#endif
#ifdef __raw_writel
# define writel(v,a)    ({ __raw_writel((v),(a)); mb(); })
#endif

#define readb_relaxed(a) readb(a)
#define readw_relaxed(a) readw(a)
#define readl_relaxed(a) readl(a)

/* Simple MMIO */
#define ioread8(a)              readb(a)
#define ioread16(a)             readw(a)
#define ioread16be(a)           be16_to_cpu(__raw_readw((a)))
#define ioread32(a)             readl(a)
#define ioread32be(a)           be32_to_cpu(__raw_readl((a)))

#define iowrite8(v,a)           writeb((v),(a))
#define iowrite16(v,a)          writew((v),(a))
#define iowrite16be(v,a)        __raw_writew(cpu_to_be16((v)),(a))
#define iowrite32(v,a)          writel((v),(a))
#define iowrite32be(v,a)        __raw_writel(cpu_to_be32((v)),(a))

#define ioread8_rep(a,d,c)      insb((a),(d),(c))
#define ioread16_rep(a,d,c)     insw((a),(d),(c))
#define ioread32_rep(a,d,c)     insl((a),(d),(c))

#define iowrite8_rep(a,s,c)     outsb((a),(s),(c))
#define iowrite16_rep(a,s,c)    outsw((a),(s),(c))
#define iowrite32_rep(a,s,c)    outsl((a),(s),(c))

#define mmiowb()        wmb()   /* synco on SH-4A, otherwise a nop */

/*
 * This function provides a method for the generic case where a board-specific
 * ioport_map simply needs to return the port + some arbitrary port base.
 *
 * We use this at board setup time to implicitly set the port base, and
 * as a result, we can use the generic ioport_map.
 */
static inline void __set_io_port_base(unsigned long pbase)
{
        extern unsigned long generic_io_base;

        generic_io_base = pbase;
}

#define isa_readb(a) readb(ioport_map(a, 1))
#define isa_readw(a) readw(ioport_map(a, 2))
#define isa_readl(a) readl(ioport_map(a, 4))
#define isa_writeb(b,a) writeb(b,ioport_map(a, 1))
#define isa_writew(w,a) writew(w,ioport_map(a, 2))
#define isa_writel(l,a) writel(l,ioport_map(a, 4))

#define isa_memset_io(a,b,c) \
  memset((void *)(ioport_map((unsigned long)(a), 1)),(b),(c))
#define isa_memcpy_fromio(a,b,c) \
  memcpy((a),(void *)(ioport_map((unsigned long)(b), 1)),(c))
#define isa_memcpy_toio(a,b,c) \
  memcpy((void *)(ioport_map((unsigned long)(a), 1)),(b),(c))

/* We really want to try and get these to memcpy etc */
extern void memcpy_fromio(void *, volatile void __iomem *, unsigned long);
extern void memcpy_toio(volatile void __iomem *, const void *, unsigned long);
extern void memset_io(volatile void __iomem *, int, unsigned long);

/* SuperH on-chip I/O functions */
static inline unsigned char ctrl_inb(unsigned long addr)
{
        return *(volatile unsigned char*)addr;
}

static inline unsigned short ctrl_inw(unsigned long addr)
{
        return *(volatile unsigned short*)addr;
}

static inline unsigned int ctrl_inl(unsigned long addr)
{
        return *(volatile unsigned long*)addr;
}

static inline void ctrl_outb(unsigned char b, unsigned long addr)
{
        *(volatile unsigned char*)addr = b;
}

static inline void ctrl_outw(unsigned short b, unsigned long addr)
{
        *(volatile unsigned short*)addr = b;
}

static inline void ctrl_outl(unsigned int b, unsigned long addr)
{
        *(volatile unsigned long*)addr = b;
}

#define IO_SPACE_LIMIT 0xffffffff

/*
 * Change virtual addresses to physical addresses and vv.
 * These are trivial on the 1:1 Linux/SuperH mapping
 */
static inline unsigned long virt_to_phys(volatile void *address)
{
        return PHYSADDR(address);
}

static inline void *phys_to_virt(unsigned long address)
{
        return (void *)P1SEGADDR(address);
}

#define virt_to_bus virt_to_phys
#define bus_to_virt phys_to_virt
#define page_to_bus page_to_phys

/*
 * readX/writeX() are used to access memory mapped devices. On some
 * architectures the memory mapped IO stuff needs to be accessed
 * differently. On the x86 architecture, we just read/write the
 * memory location directly.
 *
 * On SH, we traditionally have the whole physical address space mapped
 * at all times (as MIPS does), so "ioremap()" and "iounmap()" do not
 * need to do anything but place the address in the proper segment. This
 * is true for P1 and P2 addresses, as well as some P3 ones. However,
 * most of the P3 addresses and newer cores using extended addressing
 * need to map through page tables, so the ioremap() implementation
 * becomes a bit more complicated. See arch/sh/mm/ioremap.c for
 * additional notes on this.
 *
 * We cheat a bit and always return uncachable areas until we've fixed
 * the drivers to handle caching properly.
 */
#ifdef CONFIG_MMU
void __iomem *__ioremap(unsigned long offset, unsigned long size,
                        unsigned long flags);
void __iounmap(void __iomem *addr);
#else
#define __ioremap(offset, size, flags)  ((void __iomem *)(offset))
#define __iounmap(addr)                 do { } while (0)
#endif /* CONFIG_MMU */

static inline void __iomem *
__ioremap_mode(unsigned long offset, unsigned long size, unsigned long flags)
{
        unsigned long last_addr = offset + size - 1;

        /*
         * For P1 and P2 space this is trivial, as everything is already
         * mapped. Uncached access for P1 addresses are done through P2.
         * In the P3 case or for addresses outside of the 29-bit space,
         * mapping must be done by the PMB or by using page tables.
         */
        if (likely(PXSEG(offset) < P3SEG && PXSEG(last_addr) < P3SEG)) {
                if (unlikely(flags & _PAGE_CACHABLE))
                        return (void __iomem *)P1SEGADDR(offset);

                return (void __iomem *)P2SEGADDR(offset);
        }

        return __ioremap(offset, size, flags);
}

#define ioremap(offset, size)                           \
        __ioremap_mode((offset), (size), 0)
#define ioremap_nocache(offset, size)                   \
        __ioremap_mode((offset), (size), 0)
#define ioremap_cache(offset, size)                     \
        __ioremap_mode((offset), (size), _PAGE_CACHABLE)
#define p3_ioremap(offset, size, flags)                 \
        __ioremap((offset), (size), (flags))
#define iounmap(addr)                                   \
        __iounmap((addr))

static inline int check_signature(char __iomem *io_addr,
                        const unsigned char *signature, int length)
{
        int retval = 0;
        do {
                if (readb(io_addr) != *signature)
                        goto out;
                io_addr++;
                signature++;
                length--;
        } while (length);
        retval = 1;
out:
        return retval;
}

/*
 * The caches on some architectures aren't dma-coherent and have need to
 * handle this in software.  There are three types of operations that
 * can be applied to dma buffers.
 *
 *  - dma_cache_wback_inv(start, size) makes caches and RAM coherent by
 *    writing the content of the caches back to memory, if necessary.
 *    The function also invalidates the affected part of the caches as
 *    necessary before DMA transfers from outside to memory.
 *  - dma_cache_inv(start, size) invalidates the affected parts of the
 *    caches.  Dirty lines of the caches may be written back or simply
 *    be discarded.  This operation is necessary before dma operations
 *    to the memory.
 *  - dma_cache_wback(start, size) writes back any dirty lines but does
 *    not invalidate the cache.  This can be used before DMA reads from
 *    memory,
 */

#define dma_cache_wback_inv(_start,_size) \
    __flush_purge_region(_start,_size)
#define dma_cache_inv(_start,_size) \
    __flush_invalidate_region(_start,_size)
#define dma_cache_wback(_start,_size) \
    __flush_wback_region(_start,_size)

/*
 * Convert a physical pointer to a virtual kernel pointer for /dev/mem
 * access
 */
#define xlate_dev_mem_ptr(p)    __va(p)

/*
 * Convert a virtual cached pointer to an uncached pointer
 */
#define xlate_dev_kmem_ptr(p)   p

#endif /* __KERNEL__ */

#endif /* __ASM_SH_IO_H */