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005174d661
It is common with memory-mapped I/O to use the address of a structure member
to access memory, as in:
struct some_regs {
u32 ctrl;
u32 data;
}
struct some_regs *regs = (struct some_regs *)BASE_ADDRESS;
writel(1, ®->ctrl);
writel(2, ®->data);
This does not currently work with inl(), outl(), etc. Add a cast to permit
this.
Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
328 lines
9.5 KiB
C
328 lines
9.5 KiB
C
#ifndef _ASM_IO_H
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#define _ASM_IO_H
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#include <linux/compiler.h>
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/*
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* This file contains the definitions for the x86 IO instructions
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* inb/inw/inl/outb/outw/outl and the "string versions" of the same
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* (insb/insw/insl/outsb/outsw/outsl). You can also use "pausing"
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* versions of the single-IO instructions (inb_p/inw_p/..).
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*
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* This file is not meant to be obfuscating: it's just complicated
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* to (a) handle it all in a way that makes gcc able to optimize it
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* as well as possible and (b) trying to avoid writing the same thing
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* over and over again with slight variations and possibly making a
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* mistake somewhere.
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*/
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/*
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* Thanks to James van Artsdalen for a better timing-fix than
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* the two short jumps: using outb's to a nonexistent port seems
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* to guarantee better timings even on fast machines.
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*
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* On the other hand, I'd like to be sure of a non-existent port:
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* I feel a bit unsafe about using 0x80 (should be safe, though)
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*
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* Linus
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*/
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/*
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* Bit simplified and optimized by Jan Hubicka
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* Support of BIGMEM added by Gerhard Wichert, Siemens AG, July 1999.
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*
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* isa_memset_io, isa_memcpy_fromio, isa_memcpy_toio added,
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* isa_read[wl] and isa_write[wl] fixed
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* - Arnaldo Carvalho de Melo <acme@conectiva.com.br>
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*/
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#define IO_SPACE_LIMIT 0xffff
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#include <asm/types.h>
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#ifdef __KERNEL__
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/*
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* readX/writeX() are used to access memory mapped devices. On some
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* architectures the memory mapped IO stuff needs to be accessed
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* differently. On the x86 architecture, we just read/write the
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* memory location directly.
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*/
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#define readb(addr) (*(volatile unsigned char *) (addr))
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#define readw(addr) (*(volatile unsigned short *) (addr))
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#define readl(addr) (*(volatile unsigned int *) (addr))
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#define __raw_readb readb
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#define __raw_readw readw
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#define __raw_readl readl
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#define writeb(b,addr) (*(volatile unsigned char *) (addr) = (b))
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#define writew(b,addr) (*(volatile unsigned short *) (addr) = (b))
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#define writel(b,addr) (*(volatile unsigned int *) (addr) = (b))
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#define __raw_writeb writeb
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#define __raw_writew writew
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#define __raw_writel writel
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#define memset_io(a,b,c) memset((a),(b),(c))
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#define memcpy_fromio(a,b,c) memcpy((a),(b),(c))
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#define memcpy_toio(a,b,c) memcpy((a),(b),(c))
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#define write_arch(type, endian, a, v) __raw_write##type(cpu_to_##endian(v), a)
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#define read_arch(type, endian, a) endian##_to_cpu(__raw_read##type(a))
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#define write_le64(a, v) write_arch(q, le64, a, v)
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#define write_le32(a, v) write_arch(l, le32, a, v)
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#define write_le16(a, v) write_arch(w, le16, a, v)
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#define read_le64(a) read_arch(q, le64, a)
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#define read_le32(a) read_arch(l, le32, a)
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#define read_le16(a) read_arch(w, le16, a)
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#define write_be32(a, v) write_arch(l, be32, a, v)
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#define write_be16(a, v) write_arch(w, be16, a, v)
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#define read_be32(a) read_arch(l, be32, a)
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#define read_be16(a) read_arch(w, be16, a)
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#define write_8(a, v) __raw_writeb(v, a)
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#define read_8(a) __raw_readb(a)
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#define clrbits(type, addr, clear) \
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write_##type((addr), read_##type(addr) & ~(clear))
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#define setbits(type, addr, set) \
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write_##type((addr), read_##type(addr) | (set))
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#define clrsetbits(type, addr, clear, set) \
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write_##type((addr), (read_##type(addr) & ~(clear)) | (set))
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#define clrbits_be32(addr, clear) clrbits(be32, addr, clear)
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#define setbits_be32(addr, set) setbits(be32, addr, set)
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#define clrsetbits_be32(addr, clear, set) clrsetbits(be32, addr, clear, set)
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#define clrbits_le32(addr, clear) clrbits(le32, addr, clear)
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#define setbits_le32(addr, set) setbits(le32, addr, set)
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#define clrsetbits_le32(addr, clear, set) clrsetbits(le32, addr, clear, set)
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#define clrbits_be16(addr, clear) clrbits(be16, addr, clear)
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#define setbits_be16(addr, set) setbits(be16, addr, set)
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#define clrsetbits_be16(addr, clear, set) clrsetbits(be16, addr, clear, set)
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#define clrbits_le16(addr, clear) clrbits(le16, addr, clear)
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#define setbits_le16(addr, set) setbits(le16, addr, set)
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#define clrsetbits_le16(addr, clear, set) clrsetbits(le16, addr, clear, set)
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#define clrbits_8(addr, clear) clrbits(8, addr, clear)
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#define setbits_8(addr, set) setbits(8, addr, set)
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#define clrsetbits_8(addr, clear, set) clrsetbits(8, addr, clear, set)
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/*
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* ISA space is 'always mapped' on a typical x86 system, no need to
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* explicitly ioremap() it. The fact that the ISA IO space is mapped
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* to PAGE_OFFSET is pure coincidence - it does not mean ISA values
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* are physical addresses. The following constant pointer can be
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* used as the IO-area pointer (it can be iounmapped as well, so the
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* analogy with PCI is quite large):
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*/
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#define isa_readb(a) readb((a))
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#define isa_readw(a) readw((a))
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#define isa_readl(a) readl((a))
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#define isa_writeb(b,a) writeb(b,(a))
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#define isa_writew(w,a) writew(w,(a))
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#define isa_writel(l,a) writel(l,(a))
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#define isa_memset_io(a,b,c) memset_io((a),(b),(c))
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#define isa_memcpy_fromio(a,b,c) memcpy_fromio((a),(b),(c))
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#define isa_memcpy_toio(a,b,c) memcpy_toio((a),(b),(c))
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static inline int check_signature(unsigned long io_addr,
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const unsigned char *signature, int length)
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{
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int retval = 0;
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do {
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if (readb(io_addr) != *signature)
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goto out;
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io_addr++;
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signature++;
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length--;
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} while (length);
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retval = 1;
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out:
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return retval;
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}
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/**
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* isa_check_signature - find BIOS signatures
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* @io_addr: mmio address to check
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* @signature: signature block
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* @length: length of signature
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*
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* Perform a signature comparison with the ISA mmio address io_addr.
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* Returns 1 on a match.
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*
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* This function is deprecated. New drivers should use ioremap and
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* check_signature.
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*/
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static inline int isa_check_signature(unsigned long io_addr,
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const unsigned char *signature, int length)
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{
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int retval = 0;
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do {
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if (isa_readb(io_addr) != *signature)
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goto out;
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io_addr++;
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signature++;
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length--;
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} while (length);
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retval = 1;
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out:
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return retval;
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}
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#endif /* __KERNEL__ */
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#ifdef SLOW_IO_BY_JUMPING
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#define __SLOW_DOWN_IO "\njmp 1f\n1:\tjmp 1f\n1:"
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#else
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#define __SLOW_DOWN_IO "\noutb %%al,$0xed"
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#endif
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#ifdef REALLY_SLOW_IO
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#define __FULL_SLOW_DOWN_IO __SLOW_DOWN_IO __SLOW_DOWN_IO __SLOW_DOWN_IO __SLOW_DOWN_IO
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#else
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#define __FULL_SLOW_DOWN_IO __SLOW_DOWN_IO
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#endif
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/*
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* Talk about misusing macros..
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*/
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#define __OUT1(s,x) \
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static inline void _out##s(unsigned x value, unsigned short port) {
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#define __OUT2(s,s1,s2) \
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__asm__ __volatile__ ("out" #s " %" s1 "0,%" s2 "1"
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#define __OUT(s,s1,x) \
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__OUT1(s,x) __OUT2(s,s1,"w") : : "a" (value), "Nd" (port)); } \
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__OUT1(s##_p,x) __OUT2(s,s1,"w") __FULL_SLOW_DOWN_IO : : "a" (value), "Nd" (port));}
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#define __IN1(s) \
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static inline RETURN_TYPE _in##s(unsigned short port) { RETURN_TYPE _v;
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#define __IN2(s,s1,s2) \
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__asm__ __volatile__ ("in" #s " %" s2 "1,%" s1 "0"
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#define __IN(s,s1,i...) \
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__IN1(s) __IN2(s,s1,"w") : "=a" (_v) : "Nd" (port) ,##i ); return _v; } \
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__IN1(s##_p) __IN2(s,s1,"w") __FULL_SLOW_DOWN_IO : "=a" (_v) : "Nd" (port) ,##i ); return _v; }
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#define __INS(s) \
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static inline void ins##s(unsigned short port, void * addr, unsigned long count) \
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{ __asm__ __volatile__ ("rep ; ins" #s \
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: "=D" (addr), "=c" (count) : "d" (port),"0" (addr),"1" (count)); }
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#define __OUTS(s) \
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static inline void outs##s(unsigned short port, const void * addr, unsigned long count) \
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{ __asm__ __volatile__ ("rep ; outs" #s \
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: "=S" (addr), "=c" (count) : "d" (port),"0" (addr),"1" (count)); }
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#define RETURN_TYPE unsigned char
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__IN(b,"")
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#undef RETURN_TYPE
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#define RETURN_TYPE unsigned short
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__IN(w,"")
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#undef RETURN_TYPE
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#define RETURN_TYPE unsigned int
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__IN(l,"")
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#undef RETURN_TYPE
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#define inb(port) _inb((uintptr_t)(port))
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#define inw(port) _inw((uintptr_t)(port))
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#define inl(port) _inl((uintptr_t)(port))
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__OUT(b,"b",char)
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__OUT(w,"w",short)
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__OUT(l,,int)
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#define outb(val, port) _outb(val, (uintptr_t)(port))
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#define outw(val, port) _outw(val, (uintptr_t)(port))
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#define outl(val, port) _outl(val, (uintptr_t)(port))
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__INS(b)
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__INS(w)
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__INS(l)
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__OUTS(b)
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__OUTS(w)
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__OUTS(l)
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/* IO space accessors */
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#define clrio(type, addr, clear) \
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out##type(in##type(addr) & ~(clear), (addr))
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#define setio(type, addr, set) \
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out##type(in##type(addr) | (set), (addr))
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#define clrsetio(type, addr, clear, set) \
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out##type((in##type(addr) & ~(clear)) | (set), (addr))
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#define clrio_32(addr, clear) clrio(l, addr, clear)
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#define clrio_16(addr, clear) clrio(w, addr, clear)
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#define clrio_8(addr, clear) clrio(b, addr, clear)
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#define setio_32(addr, set) setio(l, addr, set)
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#define setio_16(addr, set) setio(w, addr, set)
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#define setio_8(addr, set) setio(b, addr, set)
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#define clrsetio_32(addr, clear, set) clrsetio(l, addr, clear, set)
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#define clrsetio_16(addr, clear, set) clrsetio(w, addr, clear, set)
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#define clrsetio_8(addr, clear, set) clrsetio(b, addr, clear, set)
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static inline void sync(void)
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{
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}
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/*
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* Given a physical address and a length, return a virtual address
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* that can be used to access the memory range with the caching
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* properties specified by "flags".
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*/
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#define MAP_NOCACHE (0)
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#define MAP_WRCOMBINE (0)
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#define MAP_WRBACK (0)
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#define MAP_WRTHROUGH (0)
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static inline void *
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map_physmem(phys_addr_t paddr, unsigned long len, unsigned long flags)
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{
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return (void *)(uintptr_t)paddr;
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}
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/*
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* Take down a mapping set up by map_physmem().
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*/
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static inline void unmap_physmem(void *vaddr, unsigned long flags)
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{
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}
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static inline phys_addr_t virt_to_phys(void * vaddr)
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{
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return (phys_addr_t)(uintptr_t)(vaddr);
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}
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/*
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* TODO: The kernel offers some more advanced versions of barriers, it might
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* have some advantages to use them instead of the simple one here.
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*/
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#define dmb() __asm__ __volatile__ ("" : : : "memory")
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#define __iormb() dmb()
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#define __iowmb() dmb()
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#endif
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