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/* SPDX-License-Identifier: GPL-2.0+ */
/*
* (C) Copyright 2000-2002
* Wolfgang Denk, DENX Software Engineering, wd@denx.de.
*/
#ifndef _ASM_IO_H
#define _ASM_IO_H
#include <linux/compiler.h>
/*
* This file contains the definitions for the x86 IO instructions
* inb/inw/inl/outb/outw/outl and the "string versions" of the same
* (insb/insw/insl/outsb/outsw/outsl). You can also use "pausing"
* versions of the single-IO instructions (inb_p/inw_p/..).
*
* This file is not meant to be obfuscating: it's just complicated
* to (a) handle it all in a way that makes gcc able to optimize it
* as well as possible and (b) trying to avoid writing the same thing
* over and over again with slight variations and possibly making a
* mistake somewhere.
*/
/*
* Thanks to James van Artsdalen for a better timing-fix than
* the two short jumps: using outb's to a nonexistent port seems
* to guarantee better timings even on fast machines.
*
* On the other hand, I'd like to be sure of a non-existent port:
* I feel a bit unsafe about using 0x80 (should be safe, though)
*
* Linus
*/
/*
* Bit simplified and optimized by Jan Hubicka
* Support of BIGMEM added by Gerhard Wichert, Siemens AG, July 1999.
*
* isa_memset_io, isa_memcpy_fromio, isa_memcpy_toio added,
* isa_read[wl] and isa_write[wl] fixed
* - Arnaldo Carvalho de Melo <acme@conectiva.com.br>
*/
#define IO_SPACE_LIMIT 0xffff
#include <asm/types.h>
#ifdef __KERNEL__
/*
* 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.
*/
#define readb(addr) (*(volatile u8 *)(uintptr_t)(addr))
#define readw(addr) (*(volatile u16 *)(uintptr_t)(addr))
#define readl(addr) (*(volatile u32 *)(uintptr_t)(addr))
#define readq(addr) (*(volatile u64 *)(uintptr_t)(addr))
#define __raw_readb readb
#define __raw_readw readw
#define __raw_readl readl
#define __raw_readq readq
#define writeb(b, addr) (*(volatile u8 *)(addr) = (b))
#define writew(b, addr) (*(volatile u16 *)(addr) = (b))
#define writel(b, addr) (*(volatile u32 *)(addr) = (b))
#define writeq(b, addr) (*(volatile u64 *)(addr) = (b))
#define __raw_writeb writeb
#define __raw_writew writew
#define __raw_writel writel
#define __raw_writeq writeq
#define memset_io(a,b,c) memset((a),(b),(c))
#define memcpy_fromio(a,b,c) memcpy((a),(b),(c))
#define memcpy_toio(a,b,c) memcpy((a),(b),(c))
#define out_arch(type, endian, a, v) __raw_write##type(cpu_to_##endian(v), a)
#define in_arch(type, endian, a) endian##_to_cpu(__raw_read##type(a))
#define out_le64(a, v) out_arch(q, le64, a, v)
#define out_le32(a, v) out_arch(l, le32, a, v)
#define out_le16(a, v) out_arch(w, le16, a, v)
#define in_le64(a) in_arch(q, le64, a)
#define in_le32(a) in_arch(l, le32, a)
#define in_le16(a) in_arch(w, le16, a)
#define out_be32(a, v) out_arch(l, be32, a, v)
#define out_be16(a, v) out_arch(w, be16, a, v)
#define in_be32(a) in_arch(l, be32, a)
#define in_be16(a) in_arch(w, be16, a)
#define out_8(a, v) __raw_writeb(v, a)
#define in_8(a) __raw_readb(a)
#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)
#endif /* __KERNEL__ */
#ifdef SLOW_IO_BY_JUMPING
#define __SLOW_DOWN_IO "\njmp 1f\n1:\tjmp 1f\n1:"
#else
#define __SLOW_DOWN_IO "\noutb %%al,$0xed"
#endif
#ifdef REALLY_SLOW_IO
#define __FULL_SLOW_DOWN_IO __SLOW_DOWN_IO __SLOW_DOWN_IO __SLOW_DOWN_IO __SLOW_DOWN_IO
#else
#define __FULL_SLOW_DOWN_IO __SLOW_DOWN_IO
#endif
/*
* Talk about misusing macros..
*/
#define __OUT1(s,x) \
static inline void _out##s(unsigned x value, unsigned short port) {
#define __OUT2(s,s1,s2) \
__asm__ __volatile__ ("out" #s " %" s1 "0,%" s2 "1"
#define __OUT(s,s1,x) \
__OUT1(s,x) __OUT2(s,s1,"w") : : "a" (value), "Nd" (port)); } \
__OUT1(s##_p,x) __OUT2(s,s1,"w") __FULL_SLOW_DOWN_IO : : "a" (value), "Nd" (port));}
#define __IN1(s) \
static inline RETURN_TYPE _in##s(unsigned short port) { RETURN_TYPE _v;
#define __IN2(s,s1,s2) \
__asm__ __volatile__ ("in" #s " %" s2 "1,%" s1 "0"
#define __IN(s,s1,i...) \
__IN1(s) __IN2(s,s1,"w") : "=a" (_v) : "Nd" (port) ,##i ); return _v; } \
__IN1(s##_p) __IN2(s,s1,"w") __FULL_SLOW_DOWN_IO : "=a" (_v) : "Nd" (port) ,##i ); return _v; }
#define __INS(s) \
static inline void ins##s(unsigned short port, void * addr, unsigned long count) \
{ __asm__ __volatile__ ("rep ; ins" #s \
: "=D" (addr), "=c" (count) : "d" (port),"0" (addr),"1" (count)); }
#define __OUTS(s) \
static inline void outs##s(unsigned short port, const void * addr, unsigned long count) \
{ __asm__ __volatile__ ("rep ; outs" #s \
: "=S" (addr), "=c" (count) : "d" (port),"0" (addr),"1" (count)); }
#define RETURN_TYPE unsigned char
__IN(b,"")
#undef RETURN_TYPE
#define RETURN_TYPE unsigned short
__IN(w,"")
#undef RETURN_TYPE
#define RETURN_TYPE unsigned int
__IN(l,"")
#undef RETURN_TYPE
#define inb(port) _inb((uintptr_t)(port))
#define inw(port) _inw((uintptr_t)(port))
#define inl(port) _inl((uintptr_t)(port))
__OUT(b,"b",char)
__OUT(w,"w",short)
__OUT(l,,int)
#define outb(val, port) _outb(val, (uintptr_t)(port))
#define outw(val, port) _outw(val, (uintptr_t)(port))
#define outl(val, port) _outl(val, (uintptr_t)(port))
__INS(b)
__INS(w)
__INS(l)
__OUTS(b)
__OUTS(w)
__OUTS(l)
/* IO space accessors */
#define clrio(type, addr, clear) \
out##type(in##type(addr) & ~(clear), (addr))
#define setio(type, addr, set) \
out##type(in##type(addr) | (set), (addr))
#define clrsetio(type, addr, clear, set) \
out##type((in##type(addr) & ~(clear)) | (set), (addr))
#define clrio_32(addr, clear) clrio(l, addr, clear)
#define clrio_16(addr, clear) clrio(w, addr, clear)
#define clrio_8(addr, clear) clrio(b, addr, clear)
#define setio_32(addr, set) setio(l, addr, set)
#define setio_16(addr, set) setio(w, addr, set)
#define setio_8(addr, set) setio(b, addr, set)
#define clrsetio_32(addr, clear, set) clrsetio(l, addr, clear, set)
#define clrsetio_16(addr, clear, set) clrsetio(w, addr, clear, set)
#define clrsetio_8(addr, clear, set) clrsetio(b, addr, clear, set)
static inline void sync(void)
{
}
/*
* TODO: The kernel offers some more advanced versions of barriers, it might
* have some advantages to use them instead of the simple one here.
*/
#define dmb() __asm__ __volatile__ ("" : : : "memory")
#define __iormb() dmb()
#define __iowmb() dmb()
/*
* 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.
*/
/*
* We assume that all the low physical PIO addresses (0-0xffff) 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_RESERVED 0x10000UL
/*
* 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 { \
is_pio; \
} \
} while (0)
static inline u8 ioread8(const volatile void __iomem *addr)
{
IO_COND(addr, return inb(port), return readb(addr));
return 0xff;
}
static inline u16 ioread16(const volatile void __iomem *addr)
{
IO_COND(addr, return inw(port), return readw(addr));
return 0xffff;
}
static inline u32 ioread32(const volatile void __iomem *addr)
{
IO_COND(addr, return inl(port), return readl(addr));
return 0xffffffff;
}
static inline void iowrite8(u8 value, volatile void __iomem *addr)
{
IO_COND(addr, outb(value, port), writeb(value, addr));
}
static inline void iowrite16(u16 value, volatile void __iomem *addr)
{
IO_COND(addr, outw(value, port), writew(value, addr));
}
static inline void iowrite32(u32 value, volatile void __iomem *addr)
{
IO_COND(addr, outl(value, port), writel(value, addr));
}
#include <asm-generic/io.h>
#endif /* _ASM_IO_H */