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https://git.kernel.org/pub/scm/linux/kernel/git/chenhuacai/linux-loongson
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b92b361213
The ioread/iowrite accessors also need barriers as they're used in place of readl/writel et.al. in portable drivers. Create __iormb() and __iowmb() which are conditionally defined to be barriers dependent on ARM_DMA_MEM_BUFFERABLE, and always use these macros in the accessors. Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
319 lines
11 KiB
C
319 lines
11 KiB
C
/*
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* arch/arm/include/asm/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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* 05-Oct-2004 BJD Moved memory string functions to use void __iomem
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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 <asm/byteorder.h>
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#include <asm/memory.h>
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#include <asm/system.h>
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/*
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* ISA I/O bus memory addresses are 1:1 with the physical address.
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*/
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#define isa_virt_to_bus virt_to_phys
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#define isa_page_to_bus page_to_phys
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#define isa_bus_to_virt phys_to_virt
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/*
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* Generic IO read/write. These perform native-endian accesses. Note
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* that some architectures will want to re-define __raw_{read,write}w.
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*/
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extern void __raw_writesb(void __iomem *addr, const void *data, int bytelen);
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extern void __raw_writesw(void __iomem *addr, const void *data, int wordlen);
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extern void __raw_writesl(void __iomem *addr, const void *data, int longlen);
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extern void __raw_readsb(const void __iomem *addr, void *data, int bytelen);
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extern void __raw_readsw(const void __iomem *addr, void *data, int wordlen);
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extern void __raw_readsl(const void __iomem *addr, void *data, int longlen);
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#define __raw_writeb(v,a) (__chk_io_ptr(a), *(volatile unsigned char __force *)(a) = (v))
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#define __raw_writew(v,a) (__chk_io_ptr(a), *(volatile unsigned short __force *)(a) = (v))
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#define __raw_writel(v,a) (__chk_io_ptr(a), *(volatile unsigned int __force *)(a) = (v))
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#define __raw_readb(a) (__chk_io_ptr(a), *(volatile unsigned char __force *)(a))
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#define __raw_readw(a) (__chk_io_ptr(a), *(volatile unsigned short __force *)(a))
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#define __raw_readl(a) (__chk_io_ptr(a), *(volatile unsigned int __force *)(a))
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/*
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* Architecture ioremap implementation.
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*/
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#define MT_DEVICE 0
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#define MT_DEVICE_NONSHARED 1
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#define MT_DEVICE_CACHED 2
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#define MT_DEVICE_WC 3
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/*
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* types 4 onwards can be found in asm/mach/map.h and are undefined
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* for ioremap
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*/
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/*
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* __arm_ioremap takes CPU physical address.
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* __arm_ioremap_pfn takes a Page Frame Number and an offset into that page
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* The _caller variety takes a __builtin_return_address(0) value for
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* /proc/vmalloc to use - and should only be used in non-inline functions.
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*/
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extern void __iomem *__arm_ioremap_pfn_caller(unsigned long, unsigned long,
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size_t, unsigned int, void *);
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extern void __iomem *__arm_ioremap_caller(unsigned long, size_t, unsigned int,
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void *);
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extern void __iomem *__arm_ioremap_pfn(unsigned long, unsigned long, size_t, unsigned int);
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extern void __iomem *__arm_ioremap(unsigned long, size_t, unsigned int);
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extern void __iounmap(volatile void __iomem *addr);
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/*
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* Bad read/write accesses...
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*/
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extern void __readwrite_bug(const char *fn);
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/*
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* A typesafe __io() helper
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*/
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static inline void __iomem *__typesafe_io(unsigned long addr)
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{
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return (void __iomem *)addr;
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}
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/*
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* Now, pick up the machine-defined IO definitions
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*/
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#include <mach/io.h>
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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 ARM 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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* Note that for a big endian machine, this implies that the following
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* big endian mode connectivity is in place, as described by numerous
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* ARM documents:
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*
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* PCI: D0-D7 D8-D15 D16-D23 D24-D31
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* ARM: D24-D31 D16-D23 D8-D15 D0-D7
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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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#ifdef __io
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#define outb(v,p) __raw_writeb(v,__io(p))
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#define outw(v,p) __raw_writew((__force __u16) \
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cpu_to_le16(v),__io(p))
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#define outl(v,p) __raw_writel((__force __u32) \
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cpu_to_le32(v),__io(p))
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#define inb(p) ({ __u8 __v = __raw_readb(__io(p)); __v; })
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#define inw(p) ({ __u16 __v = le16_to_cpu((__force __le16) \
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__raw_readw(__io(p))); __v; })
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#define inl(p) ({ __u32 __v = le32_to_cpu((__force __le32) \
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__raw_readl(__io(p))); __v; })
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#define outsb(p,d,l) __raw_writesb(__io(p),d,l)
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#define outsw(p,d,l) __raw_writesw(__io(p),d,l)
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#define outsl(p,d,l) __raw_writesl(__io(p),d,l)
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#define insb(p,d,l) __raw_readsb(__io(p),d,l)
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#define insw(p,d,l) __raw_readsw(__io(p),d,l)
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#define insl(p,d,l) __raw_readsl(__io(p),d,l)
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#endif
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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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/*
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* String version of IO memory access ops:
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*/
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extern void _memcpy_fromio(void *, const volatile void __iomem *, size_t);
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extern void _memcpy_toio(volatile void __iomem *, const void *, size_t);
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extern void _memset_io(volatile void __iomem *, int, size_t);
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#define mmiowb()
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/*
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* Memory access primitives
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* ------------------------
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*
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* These perform PCI memory accesses via an ioremap region. They don't
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* take an address as such, but a cookie.
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*
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* Again, this are defined to perform little endian accesses. See the
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* IO port primitives for more information.
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*/
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#ifdef __mem_pci
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#define readb_relaxed(c) ({ u8 __v = __raw_readb(__mem_pci(c)); __v; })
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#define readw_relaxed(c) ({ u16 __v = le16_to_cpu((__force __le16) \
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__raw_readw(__mem_pci(c))); __v; })
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#define readl_relaxed(c) ({ u32 __v = le32_to_cpu((__force __le32) \
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__raw_readl(__mem_pci(c))); __v; })
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#define writeb_relaxed(v,c) ((void)__raw_writeb(v,__mem_pci(c)))
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#define writew_relaxed(v,c) ((void)__raw_writew((__force u16) \
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cpu_to_le16(v),__mem_pci(c)))
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#define writel_relaxed(v,c) ((void)__raw_writel((__force u32) \
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cpu_to_le32(v),__mem_pci(c)))
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#ifdef CONFIG_ARM_DMA_MEM_BUFFERABLE
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#define __iormb() rmb()
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#define __iowmb() wmb()
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#else
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#define __iormb() do { } while (0)
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#define __iowmb() do { } while (0)
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#endif
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#define readb(c) ({ u8 __v = readb_relaxed(c); __iormb(); __v; })
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#define readw(c) ({ u16 __v = readw_relaxed(c); __iormb(); __v; })
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#define readl(c) ({ u32 __v = readl_relaxed(c); __iormb(); __v; })
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#define writeb(v,c) ({ __iowmb(); writeb_relaxed(v,c); })
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#define writew(v,c) ({ __iowmb(); writew_relaxed(v,c); })
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#define writel(v,c) ({ __iowmb(); writel_relaxed(v,c); })
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#define readsb(p,d,l) __raw_readsb(__mem_pci(p),d,l)
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#define readsw(p,d,l) __raw_readsw(__mem_pci(p),d,l)
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#define readsl(p,d,l) __raw_readsl(__mem_pci(p),d,l)
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#define writesb(p,d,l) __raw_writesb(__mem_pci(p),d,l)
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#define writesw(p,d,l) __raw_writesw(__mem_pci(p),d,l)
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#define writesl(p,d,l) __raw_writesl(__mem_pci(p),d,l)
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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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#elif !defined(readb)
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#define readb(c) (__readwrite_bug("readb"),0)
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#define readw(c) (__readwrite_bug("readw"),0)
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#define readl(c) (__readwrite_bug("readl"),0)
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#define writeb(v,c) __readwrite_bug("writeb")
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#define writew(v,c) __readwrite_bug("writew")
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#define writel(v,c) __readwrite_bug("writel")
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#define check_signature(io,sig,len) (0)
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#endif /* __mem_pci */
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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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* Documentation/IO-mapping.txt.
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*
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*/
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#ifndef __arch_ioremap
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#define ioremap(cookie,size) __arm_ioremap(cookie, size, MT_DEVICE)
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#define ioremap_nocache(cookie,size) __arm_ioremap(cookie, size, MT_DEVICE)
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#define ioremap_cached(cookie,size) __arm_ioremap(cookie, size, MT_DEVICE_CACHED)
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#define ioremap_wc(cookie,size) __arm_ioremap(cookie, size, MT_DEVICE_WC)
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#define iounmap(cookie) __iounmap(cookie)
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#else
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#define ioremap(cookie,size) __arch_ioremap((cookie), (size), MT_DEVICE)
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#define ioremap_nocache(cookie,size) __arch_ioremap((cookie), (size), MT_DEVICE)
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#define ioremap_cached(cookie,size) __arch_ioremap((cookie), (size), MT_DEVICE_CACHED)
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#define ioremap_wc(cookie,size) __arch_ioremap((cookie), (size), MT_DEVICE_WC)
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#define iounmap(cookie) __arch_iounmap(cookie)
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#endif
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/*
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* io{read,write}{8,16,32} macros
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*/
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#ifndef ioread8
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#define ioread8(p) ({ unsigned int __v = __raw_readb(p); __iormb(); __v; })
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#define ioread16(p) ({ unsigned int __v = le16_to_cpu((__force __le16)__raw_readw(p)); __iormb(); __v; })
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#define ioread32(p) ({ unsigned int __v = le32_to_cpu((__force __le32)__raw_readl(p)); __iormb(); __v; })
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#define iowrite8(v,p) ({ __iowmb(); (void)__raw_writeb(v, p); })
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#define iowrite16(v,p) ({ __iowmb(); (void)__raw_writew((__force __u16)cpu_to_le16(v), p); })
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#define iowrite32(v,p) ({ __iowmb(); (void)__raw_writel((__force __u32)cpu_to_le32(v), p); })
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#define ioread8_rep(p,d,c) __raw_readsb(p,d,c)
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#define ioread16_rep(p,d,c) __raw_readsw(p,d,c)
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#define ioread32_rep(p,d,c) __raw_readsl(p,d,c)
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#define iowrite8_rep(p,s,c) __raw_writesb(p,s,c)
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#define iowrite16_rep(p,s,c) __raw_writesw(p,s,c)
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#define iowrite32_rep(p,s,c) __raw_writesl(p,s,c)
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extern void __iomem *ioport_map(unsigned long port, unsigned int nr);
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extern void ioport_unmap(void __iomem *addr);
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#endif
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struct pci_dev;
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extern void __iomem *pci_iomap(struct pci_dev *dev, int bar, unsigned long maxlen);
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extern void pci_iounmap(struct pci_dev *dev, void __iomem *addr);
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/*
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* can the hardware map this into one segment or not, given no other
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* constraints.
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*/
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#define BIOVEC_MERGEABLE(vec1, vec2) \
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((bvec_to_phys((vec1)) + (vec1)->bv_len) == bvec_to_phys((vec2)))
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#ifdef CONFIG_MMU
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#define ARCH_HAS_VALID_PHYS_ADDR_RANGE
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extern int valid_phys_addr_range(unsigned long addr, size_t size);
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extern int valid_mmap_phys_addr_range(unsigned long pfn, size_t size);
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#endif
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/*
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* Convert a physical pointer to a virtual kernel pointer for /dev/mem
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* access
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*/
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#define xlate_dev_mem_ptr(p) __va(p)
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/*
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* Convert a virtual cached pointer to an uncached pointer
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*/
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#define xlate_dev_kmem_ptr(p) p
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/*
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* Register ISA memory and port locations for glibc iopl/inb/outb
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* emulation.
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*/
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extern void register_isa_ports(unsigned int mmio, unsigned int io,
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unsigned int io_shift);
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#endif /* __KERNEL__ */
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#endif /* __ASM_ARM_IO_H */
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