io.h

来自「最新版的u-boot,2008-10-18发布」· C头文件 代码 · 共 302 行

/* originally from linux source.
 * removed the dependencies on CONFIG_ values
 * removed virt_to_phys stuff (and in fact everything surrounded by #if __KERNEL__)
 * Modified By Rob Taylor, Flying Pig Systems, 2000
 */

#ifndef _PPC_IO_H
#define _PPC_IO_H

#include <linux/config.h>
#include <asm/byteorder.h>

#define SIO_CONFIG_RA   0x398
#define SIO_CONFIG_RD   0x399

#ifndef _IO_BASE
#define _IO_BASE 0
#endif

#define readb(addr) in_8((volatile u8 *)(addr))
#define writeb(b,addr) out_8((volatile u8 *)(addr), (b))
#if !defined(__BIG_ENDIAN)
#define readw(addr) (*(volatile u16 *) (addr))
#define readl(addr) (*(volatile u32 *) (addr))
#define writew(b,addr) ((*(volatile u16 *) (addr)) = (b))
#define writel(b,addr) ((*(volatile u32 *) (addr)) = (b))
#else
#define readw(addr) in_le16((volatile u16 *)(addr))
#define readl(addr) in_le32((volatile u32 *)(addr))
#define writew(b,addr) out_le16((volatile u16 *)(addr),(b))
#define writel(b,addr) out_le32((volatile u32 *)(addr),(b))
#endif

/*
 * The insw/outsw/insl/outsl macros don't do byte-swapping.
 * They are only used in practice for transferring buffers which
 * are arrays of bytes, and byte-swapping is not appropriate in
 * that case.  - paulus
 */
#define insb(port, buf, ns) _insb((u8 *)((port)+_IO_BASE), (buf), (ns))
#define outsb(port, buf, ns)    _outsb((u8 *)((port)+_IO_BASE), (buf), (ns))
#define insw(port, buf, ns) _insw_ns((u16 *)((port)+_IO_BASE), (buf), (ns))
#define outsw(port, buf, ns)    _outsw_ns((u16 *)((port)+_IO_BASE), (buf), (ns))
#define insl(port, buf, nl) _insl_ns((u32 *)((port)+_IO_BASE), (buf), (nl))
#define outsl(port, buf, nl)    _outsl_ns((u32 *)((port)+_IO_BASE), (buf), (nl))

#define inb(port)       in_8((u8 *)((port)+_IO_BASE))
#define outb(val, port)     out_8((u8 *)((port)+_IO_BASE), (val))
#if !defined(__BIG_ENDIAN)
#define inw(port)       in_be16((u16 *)((port)+_IO_BASE))
#define outw(val, port)     out_be16((u16 *)((port)+_IO_BASE), (val))
#define inl(port)       in_be32((u32 *)((port)+_IO_BASE))
#define outl(val, port)     out_be32((u32 *)((port)+_IO_BASE), (val))
#else
#define inw(port)       in_le16((u16 *)((port)+_IO_BASE))
#define outw(val, port)     out_le16((u16 *)((port)+_IO_BASE), (val))
#define inl(port)       in_le32((u32 *)((port)+_IO_BASE))
#define outl(val, port)     out_le32((u32 *)((port)+_IO_BASE), (val))
#endif

#define inb_p(port)     in_8((u8 *)((port)+_IO_BASE))
#define outb_p(val, port)   out_8((u8 *)((port)+_IO_BASE), (val))
#define inw_p(port)     in_le16((u16 *)((port)+_IO_BASE))
#define outw_p(val, port)   out_le16((u16 *)((port)+_IO_BASE), (val))
#define inl_p(port)     in_le32((u32 *)((port)+_IO_BASE))
#define outl_p(val, port)   out_le32((u32 *)((port)+_IO_BASE), (val))

extern void _insb(volatile u8 *port, void *buf, int ns);
extern void _outsb(volatile u8 *port, const void *buf, int ns);
extern void _insw(volatile u16 *port, void *buf, int ns);
extern void _outsw(volatile u16 *port, const void *buf, int ns);
extern void _insl(volatile u32 *port, void *buf, int nl);
extern void _outsl(volatile u32 *port, const void *buf, int nl);
extern void _insw_ns(volatile u16 *port, void *buf, int ns);
extern void _outsw_ns(volatile u16 *port, const void *buf, int ns);
extern void _insl_ns(volatile u32 *port, void *buf, int nl);
extern void _outsl_ns(volatile u32 *port, const void *buf, int nl);

/*
 * The *_ns versions below don't do byte-swapping.
 * Neither do the standard versions now, these are just here
 * for older code.
 */
#define insw_ns(port, buf, ns)  _insw_ns((u16 *)((port)+_IO_BASE), (buf), (ns))
#define outsw_ns(port, buf, ns) _outsw_ns((u16 *)((port)+_IO_BASE), (buf), (ns))
#define insl_ns(port, buf, nl)  _insl_ns((u32 *)((port)+_IO_BASE), (buf), (nl))
#define outsl_ns(port, buf, nl) _outsl_ns((u32 *)((port)+_IO_BASE), (buf), (nl))


#define IO_SPACE_LIMIT ~0

#define memset_io(a,b,c)       memset((void *)(a),(b),(c))
#define memcpy_fromio(a,b,c)   memcpy((a),(void *)(b),(c))
#define memcpy_toio(a,b,c)  memcpy((void *)(a),(b),(c))

/*
 * Enforce In-order Execution of I/O:
 * Acts as a barrier to ensure all previous I/O accesses have
 * completed before any further ones are issued.
 */
static inline void eieio(void)
{
	__asm__ __volatile__ ("eieio" : : : "memory");
}

static inline void sync(void)
{
	__asm__ __volatile__ ("sync" : : : "memory");
}

static inline void isync(void)
{
	__asm__ __volatile__ ("isync" : : : "memory");
}

/* Enforce in-order execution of data I/O.
 * No distinction between read/write on PPC; use eieio for all three.
 */
#define iobarrier_rw() eieio()
#define iobarrier_r()  eieio()
#define iobarrier_w()  eieio()

/*
 * Non ordered and non-swapping "raw" accessors
 */
#define __iomem
#define PCI_FIX_ADDR(addr)	(addr)

static inline unsigned char __raw_readb(const volatile void __iomem *addr)
{
	return *(volatile unsigned char *)PCI_FIX_ADDR(addr);
}
static inline unsigned short __raw_readw(const volatile void __iomem *addr)
{
	return *(volatile unsigned short *)PCI_FIX_ADDR(addr);
}
static inline unsigned int __raw_readl(const volatile void __iomem *addr)
{
	return *(volatile unsigned int *)PCI_FIX_ADDR(addr);
}
static inline void __raw_writeb(unsigned char v, volatile void __iomem *addr)
{
	*(volatile unsigned char *)PCI_FIX_ADDR(addr) = v;
}
static inline void __raw_writew(unsigned short v, volatile void __iomem *addr)
{
	*(volatile unsigned short *)PCI_FIX_ADDR(addr) = v;
}
static inline void __raw_writel(unsigned int v, volatile void __iomem *addr)
{
	*(volatile unsigned int *)PCI_FIX_ADDR(addr) = v;
}

/*
 * 8, 16 and 32 bit, big and little endian I/O operations, with barrier.
 *
 * Read operations have additional twi & isync to make sure the read
 * is actually performed (i.e. the data has come back) before we start
 * executing any following instructions.
 */
extern inline int in_8(const volatile unsigned char __iomem *addr)
{
	int ret;

	__asm__ __volatile__(
		"sync; lbz%U1%X1 %0,%1;\n"
		"twi 0,%0,0;\n"
		"isync" : "=r" (ret) : "m" (*addr));
	return ret;
}

extern inline void out_8(volatile unsigned char __iomem *addr, int val)
{
	__asm__ __volatile__("stb%U0%X0 %1,%0; eieio" : "=m" (*addr) : "r" (val));
}

extern inline int in_le16(const volatile unsigned short __iomem *addr)
{
	int ret;

	__asm__ __volatile__("sync; lhbrx %0,0,%1;\n"
			     "twi 0,%0,0;\n"
			     "isync" : "=r" (ret) :
			      "r" (addr), "m" (*addr));
	return ret;
}

extern inline int in_be16(const volatile unsigned short __iomem *addr)
{
	int ret;

	__asm__ __volatile__("sync; lhz%U1%X1 %0,%1;\n"
			     "twi 0,%0,0;\n"
			     "isync" : "=r" (ret) : "m" (*addr));
	return ret;
}

extern inline void out_le16(volatile unsigned short __iomem *addr, int val)
{
	__asm__ __volatile__("sync; sthbrx %1,0,%2" : "=m" (*addr) :
			      "r" (val), "r" (addr));
}

extern inline void out_be16(volatile unsigned short __iomem *addr, int val)
{
	__asm__ __volatile__("sync; sth%U0%X0 %1,%0" : "=m" (*addr) : "r" (val));
}

extern inline unsigned in_le32(const volatile unsigned __iomem *addr)
{
	unsigned ret;

	__asm__ __volatile__("sync; lwbrx %0,0,%1;\n"
			     "twi 0,%0,0;\n"
			     "isync" : "=r" (ret) :
			     "r" (addr), "m" (*addr));
	return ret;
}

extern inline unsigned in_be32(const volatile unsigned __iomem *addr)
{
	unsigned ret;

	__asm__ __volatile__("sync; lwz%U1%X1 %0,%1;\n"
			     "twi 0,%0,0;\n"
			     "isync" : "=r" (ret) : "m" (*addr));
	return ret;
}

extern inline void out_le32(volatile unsigned __iomem *addr, int val)
{
	__asm__ __volatile__("sync; stwbrx %1,0,%2" : "=m" (*addr) :
			     "r" (val), "r" (addr));
}

extern inline void out_be32(volatile unsigned __iomem *addr, int val)
{
	__asm__ __volatile__("sync; stw%U0%X0 %1,%0" : "=m" (*addr) : "r" (val));
}

/* Clear and set bits in one shot. These macros can be used to clear and
 * set multiple bits in a register using a single call. These macros can
 * also be used to set a multiple-bit bit pattern using a mask, by
 * specifying the mask in the 'clear' parameter and the new bit pattern
 * in the 'set' parameter.
 */

#define clrbits(type, addr, clear) \
	out_##type((addr), in_##type(addr) & ~(clear))

#define setbits(type, addr, set) \
	out_##type((addr), in_##type(addr) | (set))

#define clrsetbits(type, addr, clear, set) \
	out_##type((addr), (in_##type(addr) & ~(clear)) | (set))

#define clrbits_be32(addr, clear) clrbits(be32, addr, clear)
#define setbits_be32(addr, set) setbits(be32, addr, set)
#define clrsetbits_be32(addr, clear, set) clrsetbits(be32, addr, clear, set)

#define clrbits_le32(addr, clear) clrbits(le32, addr, clear)
#define setbits_le32(addr, set) setbits(le32, addr, set)
#define clrsetbits_le32(addr, clear, set) clrsetbits(le32, addr, clear, set)

#define clrbits_be16(addr, clear) clrbits(be16, addr, clear)
#define setbits_be16(addr, set) setbits(be16, addr, set)
#define clrsetbits_be16(addr, clear, set) clrsetbits(be16, addr, clear, set)

#define clrbits_le16(addr, clear) clrbits(le16, addr, clear)
#define setbits_le16(addr, set) setbits(le16, addr, set)
#define clrsetbits_le16(addr, clear, set) clrsetbits(le16, addr, clear, set)

#define clrbits_8(addr, clear) clrbits(8, addr, clear)
#define setbits_8(addr, set) setbits(8, addr, set)
#define clrsetbits_8(addr, clear, set) clrsetbits(8, addr, clear, set)

/*
 * Given a physical address and a length, return a virtual address
 * that can be used to access the memory range with the caching
 * properties specified by "flags".
 */
#define MAP_NOCACHE	(0)
#define MAP_WRCOMBINE	(0)
#define MAP_WRBACK	(0)
#define MAP_WRTHROUGH	(0)

static inline void *
map_physmem(phys_addr_t paddr, unsigned long len, unsigned long flags)
{
	return (void *)((unsigned long)paddr);
}

/*
 * Take down a mapping set up by map_physmem().
 */
static inline void unmap_physmem(void *vaddr, unsigned long flags)
{

}

#endif