mirror of
https://github.com/torvalds/linux
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345 lines
10 KiB
C
345 lines
10 KiB
C
#ifndef __ASM_SH_IO_H
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#define __ASM_SH_IO_H
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/*
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* Convention:
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* read{b,w,l}/write{b,w,l} are for PCI,
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* while in{b,w,l}/out{b,w,l} are for ISA
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* These may (will) be platform specific function.
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* In addition we have 'pausing' versions: in{b,w,l}_p/out{b,w,l}_p
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* and 'string' versions: ins{b,w,l}/outs{b,w,l}
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* For read{b,w,l} and write{b,w,l} there are also __raw versions, which
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* do not have a memory barrier after them.
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*
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* In addition, we have
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* ctrl_in{b,w,l}/ctrl_out{b,w,l} for SuperH specific I/O.
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* which are processor specific.
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*/
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/*
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* We follow the Alpha convention here:
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* __inb expands to an inline function call (which calls via the mv)
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* _inb is a real function call (note ___raw fns are _ version of __raw)
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* inb by default expands to _inb, but the machine specific code may
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* define it to __inb if it chooses.
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*/
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#include <asm/cache.h>
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#include <asm/system.h>
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#include <asm/addrspace.h>
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#include <asm/machvec.h>
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#include <asm/pgtable.h>
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#include <asm-generic/iomap.h>
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#ifdef __KERNEL__
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/*
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* Depending on which platform we are running on, we need different
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* I/O functions.
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*/
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#define __IO_PREFIX generic
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#include <asm/io_generic.h>
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#define maybebadio(port) \
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printk(KERN_ERR "bad PC-like io %s:%u for port 0x%lx at 0x%08x\n", \
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__FUNCTION__, __LINE__, (port), (u32)__builtin_return_address(0))
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/*
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* Since boards are able to define their own set of I/O routines through
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* their respective machine vector, we always wrap through the mv.
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*
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* Also, in the event that a board hasn't provided its own definition for
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* a given routine, it will be wrapped to generic code at run-time.
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*/
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#define __inb(p) sh_mv.mv_inb((p))
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#define __inw(p) sh_mv.mv_inw((p))
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#define __inl(p) sh_mv.mv_inl((p))
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#define __outb(x,p) sh_mv.mv_outb((x),(p))
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#define __outw(x,p) sh_mv.mv_outw((x),(p))
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#define __outl(x,p) sh_mv.mv_outl((x),(p))
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#define __inb_p(p) sh_mv.mv_inb_p((p))
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#define __inw_p(p) sh_mv.mv_inw_p((p))
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#define __inl_p(p) sh_mv.mv_inl_p((p))
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#define __outb_p(x,p) sh_mv.mv_outb_p((x),(p))
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#define __outw_p(x,p) sh_mv.mv_outw_p((x),(p))
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#define __outl_p(x,p) sh_mv.mv_outl_p((x),(p))
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#define __insb(p,b,c) sh_mv.mv_insb((p), (b), (c))
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#define __insw(p,b,c) sh_mv.mv_insw((p), (b), (c))
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#define __insl(p,b,c) sh_mv.mv_insl((p), (b), (c))
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#define __outsb(p,b,c) sh_mv.mv_outsb((p), (b), (c))
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#define __outsw(p,b,c) sh_mv.mv_outsw((p), (b), (c))
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#define __outsl(p,b,c) sh_mv.mv_outsl((p), (b), (c))
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#define __readb(a) sh_mv.mv_readb((a))
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#define __readw(a) sh_mv.mv_readw((a))
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#define __readl(a) sh_mv.mv_readl((a))
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#define __writeb(v,a) sh_mv.mv_writeb((v),(a))
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#define __writew(v,a) sh_mv.mv_writew((v),(a))
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#define __writel(v,a) sh_mv.mv_writel((v),(a))
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#define inb __inb
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#define inw __inw
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#define inl __inl
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#define outb __outb
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#define outw __outw
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#define outl __outl
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#define inb_p __inb_p
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#define inw_p __inw_p
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#define inl_p __inl_p
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#define outb_p __outb_p
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#define outw_p __outw_p
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#define outl_p __outl_p
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#define insb __insb
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#define insw __insw
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#define insl __insl
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#define outsb __outsb
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#define outsw __outsw
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#define outsl __outsl
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#define __raw_readb(a) __readb((void __iomem *)(a))
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#define __raw_readw(a) __readw((void __iomem *)(a))
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#define __raw_readl(a) __readl((void __iomem *)(a))
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#define __raw_writeb(v, a) __writeb(v, (void __iomem *)(a))
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#define __raw_writew(v, a) __writew(v, (void __iomem *)(a))
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#define __raw_writel(v, a) __writel(v, (void __iomem *)(a))
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/*
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* The platform header files may define some of these macros to use
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* the inlined versions where appropriate. These macros may also be
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* redefined by userlevel programs.
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*/
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#ifdef __readb
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# define readb(a) ({ unsigned long r_ = __raw_readb(a); mb(); r_; })
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#endif
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#ifdef __raw_readw
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# define readw(a) ({ unsigned long r_ = __raw_readw(a); mb(); r_; })
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#endif
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#ifdef __raw_readl
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# define readl(a) ({ unsigned long r_ = __raw_readl(a); mb(); r_; })
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#endif
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#ifdef __raw_writeb
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# define writeb(v,a) ({ __raw_writeb((v),(a)); mb(); })
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#endif
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#ifdef __raw_writew
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# define writew(v,a) ({ __raw_writew((v),(a)); mb(); })
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#endif
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#ifdef __raw_writel
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# define writel(v,a) ({ __raw_writel((v),(a)); mb(); })
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#endif
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#define readb_relaxed(a) readb(a)
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#define readw_relaxed(a) readw(a)
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#define readl_relaxed(a) readl(a)
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/* Simple MMIO */
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#define ioread8(a) readb(a)
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#define ioread16(a) readw(a)
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#define ioread16be(a) be16_to_cpu(__raw_readw((a)))
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#define ioread32(a) readl(a)
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#define ioread32be(a) be32_to_cpu(__raw_readl((a)))
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#define iowrite8(v,a) writeb((v),(a))
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#define iowrite16(v,a) writew((v),(a))
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#define iowrite16be(v,a) __raw_writew(cpu_to_be16((v)),(a))
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#define iowrite32(v,a) writel((v),(a))
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#define iowrite32be(v,a) __raw_writel(cpu_to_be32((v)),(a))
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#define ioread8_rep(a,d,c) insb((a),(d),(c))
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#define ioread16_rep(a,d,c) insw((a),(d),(c))
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#define ioread32_rep(a,d,c) insl((a),(d),(c))
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#define iowrite8_rep(a,s,c) outsb((a),(s),(c))
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#define iowrite16_rep(a,s,c) outsw((a),(s),(c))
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#define iowrite32_rep(a,s,c) outsl((a),(s),(c))
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#define mmiowb() wmb() /* synco on SH-4A, otherwise a nop */
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/*
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* This function provides a method for the generic case where a board-specific
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* ioport_map simply needs to return the port + some arbitrary port base.
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*
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* We use this at board setup time to implicitly set the port base, and
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* as a result, we can use the generic ioport_map.
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*/
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static inline void __set_io_port_base(unsigned long pbase)
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{
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extern unsigned long generic_io_base;
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generic_io_base = pbase;
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}
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/* We really want to try and get these to memcpy etc */
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extern void memcpy_fromio(void *, volatile void __iomem *, unsigned long);
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extern void memcpy_toio(volatile void __iomem *, const void *, unsigned long);
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extern void memset_io(volatile void __iomem *, int, unsigned long);
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/* SuperH on-chip I/O functions */
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static inline unsigned char ctrl_inb(unsigned long addr)
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{
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return *(volatile unsigned char*)addr;
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}
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static inline unsigned short ctrl_inw(unsigned long addr)
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{
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return *(volatile unsigned short*)addr;
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}
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static inline unsigned int ctrl_inl(unsigned long addr)
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{
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return *(volatile unsigned long*)addr;
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}
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static inline void ctrl_outb(unsigned char b, unsigned long addr)
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{
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*(volatile unsigned char*)addr = b;
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}
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static inline void ctrl_outw(unsigned short b, unsigned long addr)
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{
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*(volatile unsigned short*)addr = b;
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}
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static inline void ctrl_outl(unsigned int b, unsigned long addr)
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{
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*(volatile unsigned long*)addr = b;
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}
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#define IO_SPACE_LIMIT 0xffffffff
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/*
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* Change virtual addresses to physical addresses and vv.
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* These are trivial on the 1:1 Linux/SuperH mapping
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*/
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static inline unsigned long virt_to_phys(volatile void *address)
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{
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return PHYSADDR(address);
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}
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static inline void *phys_to_virt(unsigned long address)
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{
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return (void *)P1SEGADDR(address);
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}
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#define virt_to_bus virt_to_phys
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#define bus_to_virt phys_to_virt
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#define page_to_bus page_to_phys
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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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* On SH, we traditionally have the whole physical address space mapped
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* at all times (as MIPS does), so "ioremap()" and "iounmap()" do not
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* need to do anything but place the address in the proper segment. This
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* is true for P1 and P2 addresses, as well as some P3 ones. However,
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* most of the P3 addresses and newer cores using extended addressing
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* need to map through page tables, so the ioremap() implementation
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* becomes a bit more complicated. See arch/sh/mm/ioremap.c for
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* additional notes on this.
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*
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* We cheat a bit and always return uncachable areas until we've fixed
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* the drivers to handle caching properly.
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*/
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#ifdef CONFIG_MMU
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void __iomem *__ioremap(unsigned long offset, unsigned long size,
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unsigned long flags);
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void __iounmap(void __iomem *addr);
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#else
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#define __ioremap(offset, size, flags) ((void __iomem *)(offset))
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#define __iounmap(addr) do { } while (0)
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#endif /* CONFIG_MMU */
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static inline void __iomem *
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__ioremap_mode(unsigned long offset, unsigned long size, unsigned long flags)
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{
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unsigned long last_addr = offset + size - 1;
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/*
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* For P1 and P2 space this is trivial, as everything is already
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* mapped. Uncached access for P1 addresses are done through P2.
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* In the P3 case or for addresses outside of the 29-bit space,
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* mapping must be done by the PMB or by using page tables.
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*/
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if (likely(PXSEG(offset) < P3SEG && PXSEG(last_addr) < P3SEG)) {
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if (unlikely(flags & _PAGE_CACHABLE))
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return (void __iomem *)P1SEGADDR(offset);
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return (void __iomem *)P2SEGADDR(offset);
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}
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return __ioremap(offset, size, flags);
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}
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#define ioremap(offset, size) \
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__ioremap_mode((offset), (size), 0)
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#define ioremap_nocache(offset, size) \
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__ioremap_mode((offset), (size), 0)
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#define ioremap_cache(offset, size) \
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__ioremap_mode((offset), (size), _PAGE_CACHABLE)
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#define p3_ioremap(offset, size, flags) \
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__ioremap((offset), (size), (flags))
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#define iounmap(addr) \
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__iounmap((addr))
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static inline int check_signature(char __iomem *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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* The caches on some architectures aren't dma-coherent and have need to
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* handle this in software. There are three types of operations that
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* can be applied to dma buffers.
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*
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* - dma_cache_wback_inv(start, size) makes caches and RAM coherent by
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* writing the content of the caches back to memory, if necessary.
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* The function also invalidates the affected part of the caches as
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* necessary before DMA transfers from outside to memory.
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* - dma_cache_inv(start, size) invalidates the affected parts of the
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* caches. Dirty lines of the caches may be written back or simply
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* be discarded. This operation is necessary before dma operations
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* to the memory.
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* - dma_cache_wback(start, size) writes back any dirty lines but does
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* not invalidate the cache. This can be used before DMA reads from
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* memory,
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*/
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#define dma_cache_wback_inv(_start,_size) \
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__flush_purge_region(_start,_size)
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#define dma_cache_inv(_start,_size) \
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__flush_invalidate_region(_start,_size)
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#define dma_cache_wback(_start,_size) \
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__flush_wback_region(_start,_size)
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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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#endif /* __KERNEL__ */
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#endif /* __ASM_SH_IO_H */
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