mirror of
https://github.com/AsahiLinux/u-boot
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65e43a1063
virt_to_phys() returns the physical address given a virtual. In most cases this will be just the input value as the vast majority of systems run in a 1:1 mode. However in systems that are not running this way it should report the physical address or ~0 if no mapping exists for the given virtual address. Signed-off-by: Kumar Gala <galak@kernel.crashing.org>
270 lines
8.6 KiB
C
270 lines
8.6 KiB
C
/*
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* linux/include/asm-sh/io.h
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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_SH_IO_H
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#define __ASM_SH_IO_H
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#ifdef __KERNEL__
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#include <linux/types.h>
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#include <asm/byteorder.h>
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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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#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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#define __arch_putb(v, a) (*(volatile unsigned char *)(a) = (v))
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#define __arch_putw(v, a) (*(volatile unsigned short *)(a) = (v))
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#define __arch_putl(v, a) (*(volatile unsigned int *)(a) = (v))
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extern void __raw_writesb(unsigned int addr, const void *data, int bytelen);
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extern void __raw_writesw(unsigned int addr, const void *data, int wordlen);
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extern void __raw_writesl(unsigned int addr, const void *data, int longlen);
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extern void __raw_readsb(unsigned int addr, void *data, int bytelen);
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extern void __raw_readsw(unsigned int addr, void *data, int wordlen);
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extern void __raw_readsl(unsigned int addr, void *data, int longlen);
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#define __raw_writeb(v, a) __arch_putb(v, a)
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#define __raw_writew(v, a) __arch_putw(v, a)
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#define __raw_writel(v, a) __arch_putl(v, a)
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#define __raw_readb(a) __arch_getb(a)
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#define __raw_readw(a) __arch_getw(a)
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#define __raw_readl(a) __arch_getl(a)
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/*
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* The compiler seems to be incapable of optimising constants
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* properly. Spell it out to the compiler in some cases.
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* These are only valid for small values of "off" (< 1<<12)
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*/
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#define __raw_base_writeb(val, base, off) __arch_base_putb(val, base, off)
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#define __raw_base_writew(val, base, off) __arch_base_putw(val, base, off)
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#define __raw_base_writel(val, base, off) __arch_base_putl(val, base, off)
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#define __raw_base_readb(base, off) __arch_base_getb(base, off)
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#define __raw_base_readw(base, off) __arch_base_getw(base, off)
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#define __raw_base_readl(base, off) __arch_base_getl(base, off)
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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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*
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* The SH doesn't have special IO access instructions; all IO is memory
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* mapped. Note that these are defined to perform little endian accesses
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* only. Their primary purpose is to access PCI and ISA peripherals.
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*
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* The machine specific io.h include defines __io to translate an "IO"
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* address to a memory address.
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*
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* Note that we prevent GCC re-ordering or caching values in expressions
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* by introducing sequence points into the in*() definitions. Note that
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* __raw_* do not guarantee this behaviour.
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*
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* The {in,out}[bwl] macros are for emulating x86-style PCI/ISA IO space.
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*/
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#define outb(v, p) __raw_writeb(v, p)
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#define outw(v, p) __raw_writew(cpu_to_le16(v), p)
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#define outl(v, p) __raw_writel(cpu_to_le32(v), p)
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#define inb(p) ({ unsigned int __v = __raw_readb(p); __v; })
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#define inw(p) ({ unsigned int __v = __le16_to_cpu(__raw_readw(p)); __v; })
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#define inl(p) ({ unsigned int __v = __le32_to_cpu(__raw_readl(p)); __v; })
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#define outsb(p, d, l) __raw_writesb(p, d, l)
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#define outsw(p, d, l) __raw_writesw(p, d, l)
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#define outsl(p, d, l) __raw_writesl(p, d, l)
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#define insb(p, d, l) __raw_readsb(p, d, l)
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#define insw(p, d, l) __raw_readsw(p, d, l)
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#define insl(p, d, l) __raw_readsl(p, d, l)
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#define outb_p(val, port) outb((val), (port))
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#define outw_p(val, port) outw((val), (port))
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#define outl_p(val, port) outl((val), (port))
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#define inb_p(port) inb((port))
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#define inw_p(port) inw((port))
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#define inl_p(port) inl((port))
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#define outsb_p(port, from, len) outsb(port, from, len)
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#define outsw_p(port, from, len) outsw(port, from, len)
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#define outsl_p(port, from, len) outsl(port, from, len)
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#define insb_p(port, to, len) insb(port, to, len)
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#define insw_p(port, to, len) insw(port, to, len)
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#define insl_p(port, to, len) insl(port, to, len)
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/* for U-Boot PCI */
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#define out_8(port, val) outb(val, port)
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#define out_le16(port, val) outw(val, port)
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#define out_le32(port, val) outl(val, port)
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#define in_8(port) inb(port)
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#define in_le16(port) inw(port)
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#define in_le32(port) inl(port)
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/*
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* ioremap and friends.
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*
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* ioremap takes a PCI memory address, as specified in
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* linux/Documentation/IO-mapping.txt. If you want a
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* physical address, use __ioremap instead.
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*/
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extern void *__ioremap(unsigned long offset, size_t size, unsigned long flags);
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extern void __iounmap(void *addr);
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/*
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* Generic ioremap support.
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*
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* Define:
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* iomem_valid_addr(off,size)
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* iomem_to_phys(off)
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*/
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#ifdef iomem_valid_addr
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#define __arch_ioremap(off, sz, nocache) \
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({ \
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unsigned long _off = (off), _size = (sz); \
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void *_ret = (void *)0; \
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if (iomem_valid_addr(_off, _size)) \
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_ret = __ioremap(iomem_to_phys(_off), _size, 0); \
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_ret; \
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})
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#define __arch_iounmap __iounmap
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#endif
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#define ioremap(off, sz) __arch_ioremap((off), (sz), 0)
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#define ioremap_nocache(off, sz) __arch_ioremap((off), (sz), 1)
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#define iounmap(_addr) __arch_iounmap(_addr)
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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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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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/*
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* If this architecture has PCI memory IO, then define the read/write
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* macros. These should only be used with the cookie passed from
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* ioremap.
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*/
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#ifdef __mem_pci
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#define readb(c) ({ unsigned int __v = __raw_readb(__mem_pci(c)); __v; })
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#define readw(c)\
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({ unsigned int __v = le16_to_cpu(__raw_readw(__mem_pci(c))); __v; })
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#define readl(c)\
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({ unsigned int __v = le32_to_cpu(__raw_readl(__mem_pci(c))); __v; })
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#define writeb(v, c) __raw_writeb(v, __mem_pci(c))
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#define writew(v, c) __raw_writew(cpu_to_le16(v), __mem_pci(c))
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#define writel(v, c) __raw_writel(cpu_to_le32(v), __mem_pci(c))
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#define memset_io(c, v, l) _memset_io(__mem_pci(c), (v), (l))
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#define memcpy_fromio(a, c, l) _memcpy_fromio((a), __mem_pci(c), (l))
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#define memcpy_toio(c, a, l) _memcpy_toio(__mem_pci(c), (a), (l))
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#define eth_io_copy_and_sum(s, c, l, b) \
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eth_copy_and_sum((s), __mem_pci(c), (l), (b))
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static inline int
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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 (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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#elif !defined(readb)
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#define readb(addr) __raw_readb(addr)
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#define readw(addr) __raw_readw(addr)
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#define readl(addr) __raw_readl(addr)
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#define writeb(v, addr) __raw_writeb(v, addr)
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#define writew(v, addr) __raw_writew(v, addr)
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#define writel(v, addr) __raw_writel(v, addr)
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#define check_signature(io, sig, len) (0)
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#endif /* __mem_pci */
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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 *)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)(vaddr);
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}
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#endif /* __KERNEL__ */
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#endif /* __ASM_SH_IO_H */
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