io.h
上传用户:jlfgdled
上传日期:2013-04-10
资源大小:33168k
文件大小:14k
- #ifndef __ALPHA_IO_H
- #define __ALPHA_IO_H
- /* We don't use IO slowdowns on the Alpha, but.. */
- #define __SLOW_DOWN_IO do { } while (0)
- #define SLOW_DOWN_IO do { } while (0)
- /*
- * Virtual -> physical identity mapping starts at this offset
- */
- #ifdef USE_48_BIT_KSEG
- #define IDENT_ADDR 0xffff800000000000
- #else
- #define IDENT_ADDR 0xfffffc0000000000
- #endif
- #ifdef __KERNEL__
- #include <linux/config.h>
- #include <linux/kernel.h>
- #include <asm/system.h>
- #include <asm/machvec.h>
- /*
- * We try to avoid hae updates (thus the cache), but when we
- * do need to update the hae, we need to do it atomically, so
- * that any interrupts wouldn't get confused with the hae
- * register not being up-to-date with respect to the hardware
- * value.
- */
- static inline void __set_hae(unsigned long new_hae)
- {
- unsigned long flags;
- __save_and_cli(flags);
- alpha_mv.hae_cache = new_hae;
- *alpha_mv.hae_register = new_hae;
- mb();
- /* Re-read to make sure it was written. */
- new_hae = *alpha_mv.hae_register;
- __restore_flags(flags);
- }
- static inline void set_hae(unsigned long new_hae)
- {
- if (new_hae != alpha_mv.hae_cache)
- __set_hae(new_hae);
- }
- /*
- * Change virtual addresses to physical addresses and vv.
- */
- static inline unsigned long virt_to_phys(void *address)
- {
- return (unsigned long)address - IDENT_ADDR;
- }
- static inline void * phys_to_virt(unsigned long address)
- {
- return (void *) (address + IDENT_ADDR);
- }
- #define page_to_phys(page) PAGE_TO_PA(page)
- /*
- * Change addresses as seen by the kernel (virtual) to addresses as
- * seen by a device (bus), and vice versa.
- *
- * Note that this only works for a limited range of kernel addresses,
- * and very well may not span all memory. Consider this interface
- * deprecated in favour of the mapping functions in <asm/pci.h>.
- */
- extern unsigned long __direct_map_base;
- extern unsigned long __direct_map_size;
- static inline unsigned long virt_to_bus(void *address)
- {
- unsigned long phys = virt_to_phys(address);
- unsigned long bus = phys + __direct_map_base;
- return phys <= __direct_map_size ? bus : 0;
- }
- static inline void *bus_to_virt(unsigned long address)
- {
- void *virt;
- /* This check is a sanity check but also ensures that bus address 0
- maps to virtual address 0 which is useful to detect null pointers
- (the NCR driver is much simpler if NULL pointers are preserved). */
- address -= __direct_map_base;
- virt = phys_to_virt(address);
- return (long)address <= 0 ? NULL : virt;
- }
- #else /* !__KERNEL__ */
- /*
- * Define actual functions in private name-space so it's easier to
- * accommodate things like XFree or svgalib that like to define their
- * own versions of inb etc.
- */
- extern void __sethae (unsigned long addr); /* syscall */
- extern void _sethae (unsigned long addr); /* cached version */
- #endif /* !__KERNEL__ */
- /*
- * There are different chipsets to interface the Alpha CPUs to the world.
- */
- #ifdef __KERNEL__
- #ifdef CONFIG_ALPHA_GENERIC
- /* In a generic kernel, we always go through the machine vector. */
- # define __inb(p) alpha_mv.mv_inb((unsigned long)(p))
- # define __inw(p) alpha_mv.mv_inw((unsigned long)(p))
- # define __inl(p) alpha_mv.mv_inl((unsigned long)(p))
- # define __outb(x,p) alpha_mv.mv_outb((x),(unsigned long)(p))
- # define __outw(x,p) alpha_mv.mv_outw((x),(unsigned long)(p))
- # define __outl(x,p) alpha_mv.mv_outl((x),(unsigned long)(p))
- # define __readb(a) alpha_mv.mv_readb((unsigned long)(a))
- # define __readw(a) alpha_mv.mv_readw((unsigned long)(a))
- # define __readl(a) alpha_mv.mv_readl((unsigned long)(a))
- # define __readq(a) alpha_mv.mv_readq((unsigned long)(a))
- # define __writeb(v,a) alpha_mv.mv_writeb((v),(unsigned long)(a))
- # define __writew(v,a) alpha_mv.mv_writew((v),(unsigned long)(a))
- # define __writel(v,a) alpha_mv.mv_writel((v),(unsigned long)(a))
- # define __writeq(v,a) alpha_mv.mv_writeq((v),(unsigned long)(a))
- # define __ioremap(a,s) alpha_mv.mv_ioremap((unsigned long)(a),(s))
- # define __iounmap(a) alpha_mv.mv_iounmap((unsigned long)(a))
- # define __is_ioaddr(a) alpha_mv.mv_is_ioaddr((unsigned long)(a))
- # define inb __inb
- # define inw __inw
- # define inl __inl
- # define outb __outb
- # define outw __outw
- # define outl __outl
- # define __raw_readb __readb
- # define __raw_readw __readw
- # define __raw_readl __readl
- # define __raw_readq __readq
- # define __raw_writeb __writeb
- # define __raw_writew __writew
- # define __raw_writel __writel
- # define __raw_writeq __writeq
- #else
- /* Control how and what gets defined within the core logic headers. */
- #define __WANT_IO_DEF
- #if defined(CONFIG_ALPHA_APECS)
- # include <asm/core_apecs.h>
- #elif defined(CONFIG_ALPHA_CIA)
- # include <asm/core_cia.h>
- #elif defined(CONFIG_ALPHA_IRONGATE)
- # include <asm/core_irongate.h>
- #elif defined(CONFIG_ALPHA_JENSEN)
- # include <asm/jensen.h>
- #elif defined(CONFIG_ALPHA_LCA)
- # include <asm/core_lca.h>
- #elif defined(CONFIG_ALPHA_MCPCIA)
- # include <asm/core_mcpcia.h>
- #elif defined(CONFIG_ALPHA_POLARIS)
- # include <asm/core_polaris.h>
- #elif defined(CONFIG_ALPHA_T2)
- # include <asm/core_t2.h>
- #elif defined(CONFIG_ALPHA_TSUNAMI)
- # include <asm/core_tsunami.h>
- #elif defined(CONFIG_ALPHA_TITAN)
- # include <asm/core_titan.h>
- #elif defined(CONFIG_ALPHA_WILDFIRE)
- # include <asm/core_wildfire.h>
- #else
- #error "What system is this?"
- #endif
- #undef __WANT_IO_DEF
- #endif /* GENERIC */
- #endif /* __KERNEL__ */
- /*
- * The convention used for inb/outb etc. is that names starting with
- * two underscores are the inline versions, names starting with a
- * single underscore are proper functions, and names starting with a
- * letter are macros that map in some way to inline or proper function
- * versions. Not all that pretty, but before you change it, be sure
- * to convince yourself that it won't break anything (in particular
- * module support).
- */
- extern u8 _inb (unsigned long port);
- extern u16 _inw (unsigned long port);
- extern u32 _inl (unsigned long port);
- extern void _outb (u8 b,unsigned long port);
- extern void _outw (u16 w,unsigned long port);
- extern void _outl (u32 l,unsigned long port);
- extern u8 _readb(unsigned long addr);
- extern u16 _readw(unsigned long addr);
- extern u32 _readl(unsigned long addr);
- extern u64 _readq(unsigned long addr);
- extern void _writeb(u8 b, unsigned long addr);
- extern void _writew(u16 b, unsigned long addr);
- extern void _writel(u32 b, unsigned long addr);
- extern void _writeq(u64 b, unsigned long addr);
- #ifdef __KERNEL__
- /*
- * The platform header files may define some of these macros to use
- * the inlined versions where appropriate. These macros may also be
- * redefined by userlevel programs.
- */
- #ifndef inb
- # define inb(p) _inb(p)
- #endif
- #ifndef inw
- # define inw(p) _inw(p)
- #endif
- #ifndef inl
- # define inl(p) _inl(p)
- #endif
- #ifndef outb
- # define outb(b,p) _outb((b),(p))
- #endif
- #ifndef outw
- # define outw(w,p) _outw((w),(p))
- #endif
- #ifndef outl
- # define outl(l,p) _outl((l),(p))
- #endif
- #ifndef inb_p
- # define inb_p inb
- #endif
- #ifndef inw_p
- # define inw_p inw
- #endif
- #ifndef inl_p
- # define inl_p inl
- #endif
- #ifndef outb_p
- # define outb_p outb
- #endif
- #ifndef outw_p
- # define outw_p outw
- #endif
- #ifndef outl_p
- # define outl_p outl
- #endif
- #define IO_SPACE_LIMIT 0xffff
- #else
- /* Userspace declarations. Kill in 2.5. */
- extern unsigned int inb(unsigned long port);
- extern unsigned int inw(unsigned long port);
- extern unsigned int inl(unsigned long port);
- extern void outb(unsigned char b,unsigned long port);
- extern void outw(unsigned short w,unsigned long port);
- extern void outl(unsigned int l,unsigned long port);
- extern unsigned long readb(unsigned long addr);
- extern unsigned long readw(unsigned long addr);
- extern unsigned long readl(unsigned long addr);
- extern void writeb(unsigned char b, unsigned long addr);
- extern void writew(unsigned short b, unsigned long addr);
- extern void writel(unsigned int b, unsigned long addr);
- #endif /* __KERNEL__ */
- #ifdef __KERNEL__
- /*
- * On Alpha, we have the whole of I/O space mapped at all times, but
- * at odd and sometimes discontinuous addresses. Note that the
- * discontinuities are all across busses, so we need not care for that
- * for any one device.
- *
- * The DRM drivers need to be able to map contiguously a (potentially)
- * discontiguous set of I/O pages. This set of pages is scatter-gather
- * mapped contiguously from the perspective of the bus, but we can't
- * directly access DMA addresses from the CPU, these addresses need to
- * have a real ioremap. Therefore, iounmap and the size argument to
- * ioremap are needed to give the platforms the ability to fully implement
- * ioremap.
- *
- * Map the I/O space address into the kernel's virtual address space.
- */
- static inline void * ioremap(unsigned long offset, unsigned long size)
- {
- return (void *) __ioremap(offset, size);
- }
- static inline void iounmap(void *addr)
- {
- __iounmap(addr);
- }
- static inline void * ioremap_nocache(unsigned long offset, unsigned long size)
- {
- return ioremap(offset, size);
- }
- /* Indirect back to the macros provided. */
- extern u8 ___raw_readb(unsigned long addr);
- extern u16 ___raw_readw(unsigned long addr);
- extern u32 ___raw_readl(unsigned long addr);
- extern u64 ___raw_readq(unsigned long addr);
- extern void ___raw_writeb(u8 b, unsigned long addr);
- extern void ___raw_writew(u16 b, unsigned long addr);
- extern void ___raw_writel(u32 b, unsigned long addr);
- extern void ___raw_writeq(u64 b, unsigned long addr);
- #ifdef __raw_readb
- # define readb(a) ({ u8 r_ = __raw_readb(a); mb(); r_; })
- #endif
- #ifdef __raw_readw
- # define readw(a) ({ u16 r_ = __raw_readw(a); mb(); r_; })
- #endif
- #ifdef __raw_readl
- # define readl(a) ({ u32 r_ = __raw_readl(a); mb(); r_; })
- #endif
- #ifdef __raw_readq
- # define readq(a) ({ u64 r_ = __raw_readq(a); mb(); r_; })
- #endif
- #ifdef __raw_writeb
- # define writeb(v,a) ({ __raw_writeb((v),(a)); mb(); })
- #endif
- #ifdef __raw_writew
- # define writew(v,a) ({ __raw_writew((v),(a)); mb(); })
- #endif
- #ifdef __raw_writel
- # define writel(v,a) ({ __raw_writel((v),(a)); mb(); })
- #endif
- #ifdef __raw_writeq
- # define writeq(v,a) ({ __raw_writeq((v),(a)); mb(); })
- #endif
- #ifndef __raw_readb
- # define __raw_readb(a) ___raw_readb((unsigned long)(a))
- #endif
- #ifndef __raw_readw
- # define __raw_readw(a) ___raw_readw((unsigned long)(a))
- #endif
- #ifndef __raw_readl
- # define __raw_readl(a) ___raw_readl((unsigned long)(a))
- #endif
- #ifndef __raw_readq
- # define __raw_readq(a) ___raw_readq((unsigned long)(a))
- #endif
- #ifndef __raw_writeb
- # define __raw_writeb(v,a) ___raw_writeb((v),(unsigned long)(a))
- #endif
- #ifndef __raw_writew
- # define __raw_writew(v,a) ___raw_writew((v),(unsigned long)(a))
- #endif
- #ifndef __raw_writel
- # define __raw_writel(v,a) ___raw_writel((v),(unsigned long)(a))
- #endif
- #ifndef __raw_writeq
- # define __raw_writeq(v,a) ___raw_writeq((v),(unsigned long)(a))
- #endif
- #ifndef readb
- # define readb(a) _readb((unsigned long)(a))
- #endif
- #ifndef readw
- # define readw(a) _readw((unsigned long)(a))
- #endif
- #ifndef readl
- # define readl(a) _readl((unsigned long)(a))
- #endif
- #ifndef readq
- # define readq(a) _readq((unsigned long)(a))
- #endif
- #ifndef writeb
- # define writeb(v,a) _writeb((v),(unsigned long)(a))
- #endif
- #ifndef writew
- # define writew(v,a) _writew((v),(unsigned long)(a))
- #endif
- #ifndef writel
- # define writel(v,a) _writel((v),(unsigned long)(a))
- #endif
- #ifndef writeq
- # define writeq(v,a) _writeq((v),(unsigned long)(a))
- #endif
- /*
- * String version of IO memory access ops:
- */
- extern void _memcpy_fromio(void *, unsigned long, long);
- extern void _memcpy_toio(unsigned long, const void *, long);
- extern void _memset_c_io(unsigned long, unsigned long, long);
- #define memcpy_fromio(to,from,len)
- _memcpy_fromio((to),(unsigned long)(from),(len))
- #define memcpy_toio(to,from,len)
- _memcpy_toio((unsigned long)(to),(from),(len))
- #define memset_io(addr,c,len)
- _memset_c_io((unsigned long)(addr),0x0101010101010101UL*(u8)(c),(len))
- #define __HAVE_ARCH_MEMSETW_IO
- #define memsetw_io(addr,c,len)
- _memset_c_io((unsigned long)(addr),0x0001000100010001UL*(u16)(c),(len))
- /*
- * String versions of in/out ops:
- */
- extern void insb (unsigned long port, void *dst, unsigned long count);
- extern void insw (unsigned long port, void *dst, unsigned long count);
- extern void insl (unsigned long port, void *dst, unsigned long count);
- extern void outsb (unsigned long port, const void *src, unsigned long count);
- extern void outsw (unsigned long port, const void *src, unsigned long count);
- extern void outsl (unsigned long port, const void *src, unsigned long count);
- /*
- * XXX - We don't have csum_partial_copy_fromio() yet, so we cheat here and
- * just copy it. The net code will then do the checksum later. Presently
- * only used by some shared memory 8390 Ethernet cards anyway.
- */
- #define eth_io_copy_and_sum(skb,src,len,unused)
- memcpy_fromio((skb)->data,(src),(len))
- static inline int
- check_signature(unsigned long io_addr, const unsigned char *signature,
- int length)
- {
- int retval = 0;
- do {
- if (readb(io_addr) != *signature)
- goto out;
- io_addr++;
- signature++;
- length--;
- } while (length);
- retval = 1;
- out:
- return retval;
- }
- /*
- * ISA space is mapped to some machine-specific location on Alpha.
- * Call into the existing hooks to get the address translated.
- */
- #define isa_readb(a) readb(__ioremap((a),1))
- #define isa_readw(a) readw(__ioremap((a),2))
- #define isa_readl(a) readl(__ioremap((a),4))
- #define isa_writeb(b,a) writeb((b),__ioremap((a),1))
- #define isa_writew(w,a) writew((w),__ioremap((a),2))
- #define isa_writel(l,a) writel((l),__ioremap((a),4))
- #define isa_memset_io(a,b,c) memset_io(__ioremap((a),(c)),(b),(c))
- #define isa_memcpy_fromio(a,b,c) memcpy_fromio((a),__ioremap((b),(c)),(c))
- #define isa_memcpy_toio(a,b,c) memcpy_toio(__ioremap((a),(c)),(b),(c))
- static inline int
- isa_check_signature(unsigned long io_addr, const unsigned char *signature,
- int length)
- {
- int retval = 0;
- do {
- if (isa_readb(io_addr) != *signature)
- goto out;
- io_addr++;
- signature++;
- length--;
- } while (length);
- retval = 1;
- out:
- return retval;
- }
- /*
- * The Alpha Jensen hardware for some rather strange reason puts
- * the RTC clock at 0x170 instead of 0x70. Probably due to some
- * misguided idea about using 0x70 for NMI stuff.
- *
- * These defines will override the defaults when doing RTC queries
- */
- #ifdef CONFIG_ALPHA_GENERIC
- # define RTC_PORT(x) ((x) + alpha_mv.rtc_port)
- #else
- # ifdef CONFIG_ALPHA_JENSEN
- # define RTC_PORT(x) (0x170+(x))
- # else
- # define RTC_PORT(x) (0x70 + (x))
- # endif
- #endif
- #define RTC_ALWAYS_BCD 0
- /* Nothing to do */
- #define dma_cache_inv(_start,_size) do { } while (0)
- #define dma_cache_wback(_start,_size) do { } while (0)
- #define dma_cache_wback_inv(_start,_size) do { } while (0)
- #endif /* __KERNEL__ */
- #endif /* __ALPHA_IO_H */