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arm: Clean up asm/io.h
asm/io.h is the header file containing the central MMIO accessor macros. Judging by the header and the comments, it was apparently once copied from the Linux kernel, but has deviated since then *heavily*. There is absolutely no point in staying close to the original Linux code anymore, so just remove the old cruft, by: - removing pointless Linux history - removing commented code - removing outdated comments - removing unused definitions (for mem_isa) This massively improves the readability of the file. Signed-off-by: Andre Przywara <andre.przywara@arm.com>
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1 changed files with 2 additions and 96 deletions
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@ -1,45 +1,26 @@
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/*
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* linux/include/asm-arm/io.h
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* I/O device access primitives. Based on early versions from the Linux kernel.
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*
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* Copyright (C) 1996-2000 Russell King
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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* Modifications:
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* 16-Sep-1996 RMK Inlined the inx/outx functions & optimised for both
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* constant addresses and variable addresses.
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* 04-Dec-1997 RMK Moved a lot of this stuff to the new architecture
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* specific IO header files.
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* 27-Mar-1999 PJB Second parameter of memcpy_toio is const..
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* 04-Apr-1999 PJB Added check_signature.
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* 12-Dec-1999 RMK More cleanups
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* 18-Jun-2000 RMK Removed virt_to_* and friends definitions
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*/
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#ifndef __ASM_ARM_IO_H
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#define __ASM_ARM_IO_H
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#ifdef __KERNEL__
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#include <linux/types.h>
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#include <linux/kernel.h>
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#include <asm/byteorder.h>
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#include <asm/memory.h>
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#include <asm/barriers.h>
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#if 0 /* XXX###XXX */
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#include <asm/arch/hardware.h>
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#endif /* XXX###XXX */
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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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* Generic virtual read/write. Note that we don't support half-word
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* read/writes. We define __arch_*[bl] here, and leave __arch_*w
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* to the architecture specific code.
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*/
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/* Generic virtual read/write. */
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#define __arch_getb(a) (*(volatile unsigned char *)(a))
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#define __arch_getw(a) (*(volatile unsigned short *)(a))
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#define __arch_getl(a) (*(volatile unsigned int *)(a))
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@ -247,13 +228,6 @@ static inline void __raw_readsl(unsigned long addr, void *data, int longlen)
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#define setbits_64(addr, set) setbits(64, addr, set)
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#define clrsetbits_64(addr, clear, set) clrsetbits(64, addr, clear, set)
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/*
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* Now, pick up the machine-defined IO definitions
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*/
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#if 0 /* XXX###XXX */
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#include <asm/arch/io.h>
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#endif /* XXX###XXX */
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/*
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* IO port access primitives
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* -------------------------
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@ -317,16 +291,6 @@ static inline void __raw_readsl(unsigned long addr, void *data, int longlen)
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#define writesb(a, d, s) __raw_writesb((unsigned long)a, d, s)
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#define readsb(a, d, s) __raw_readsb((unsigned long)a, d, s)
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/*
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* DMA-consistent mapping functions. These allocate/free a region of
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* uncached, unwrite-buffered mapped memory space for use with DMA
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* devices. This is the "generic" version. The PCI specific version
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* is in pci.h
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*/
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extern void *consistent_alloc(int gfp, size_t size, dma_addr_t *handle);
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extern void consistent_free(void *vaddr, size_t size, dma_addr_t handle);
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extern void consistent_sync(void *vaddr, size_t size, int rw);
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/*
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* String version of IO memory access ops:
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*/
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@ -334,8 +298,6 @@ extern void _memcpy_fromio(void *, unsigned long, size_t);
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extern void _memcpy_toio(unsigned long, const void *, size_t);
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extern void _memset_io(unsigned long, int, size_t);
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extern void __readwrite_bug(const char *fn);
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/* Optimized copy functions to read from/write to IO sapce */
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#ifdef CONFIG_ARM64
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#include <cpu_func.h>
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@ -441,62 +403,6 @@ void __memset_io(volatile void __iomem *dst, int c, size_t count)
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#define memcpy_toio(a, b, c) memcpy((void *)(a), (b), (c))
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#endif
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/*
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* If this architecture has ISA IO, then define the isa_read/isa_write
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* macros.
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*/
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#ifdef __mem_isa
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#define isa_readb(addr) __raw_readb(__mem_isa(addr))
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#define isa_readw(addr) __raw_readw(__mem_isa(addr))
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#define isa_readl(addr) __raw_readl(__mem_isa(addr))
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#define isa_writeb(val,addr) __raw_writeb(val,__mem_isa(addr))
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#define isa_writew(val,addr) __raw_writew(val,__mem_isa(addr))
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#define isa_writel(val,addr) __raw_writel(val,__mem_isa(addr))
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#define isa_memset_io(a,b,c) _memset_io(__mem_isa(a),(b),(c))
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#define isa_memcpy_fromio(a,b,c) _memcpy_fromio((a),__mem_isa(b),(c))
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#define isa_memcpy_toio(a,b,c) _memcpy_toio(__mem_isa((a)),(b),(c))
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#define isa_eth_io_copy_and_sum(a,b,c,d) \
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eth_copy_and_sum((a),__mem_isa(b),(c),(d))
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static inline int
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isa_check_signature(unsigned long io_addr, const unsigned char *signature,
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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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#else /* __mem_isa */
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#define isa_readb(addr) (__readwrite_bug("isa_readb"),0)
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#define isa_readw(addr) (__readwrite_bug("isa_readw"),0)
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#define isa_readl(addr) (__readwrite_bug("isa_readl"),0)
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#define isa_writeb(val,addr) __readwrite_bug("isa_writeb")
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#define isa_writew(val,addr) __readwrite_bug("isa_writew")
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#define isa_writel(val,addr) __readwrite_bug("isa_writel")
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#define isa_memset_io(a,b,c) __readwrite_bug("isa_memset_io")
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#define isa_memcpy_fromio(a,b,c) __readwrite_bug("isa_memcpy_fromio")
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#define isa_memcpy_toio(a,b,c) __readwrite_bug("isa_memcpy_toio")
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#define isa_eth_io_copy_and_sum(a,b,c,d) \
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__readwrite_bug("isa_eth_io_copy_and_sum")
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#define isa_check_signature(io,sig,len) (0)
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#endif /* __mem_isa */
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#endif /* __KERNEL__ */
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#include <asm-generic/io.h>
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#include <iotrace.h>
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