- 根目录:
- arch
- alpha
- include
- asm
- io.h
#ifndef __ALPHA_IO_H
#define __ALPHA_IO_H
#ifdef __KERNEL__
#include <linux/kernel.h>
#include <linux/mm.h>
#include <asm/compiler.h>
#include <asm/pgtable.h>
#include <asm/machvec.h>
#include <asm/hwrpb.h>
/* The generic header contains only prototypes. Including it ensures that
the implementation we have here matches that interface. */
#include <asm-generic/iomap.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 0xffff800000000000UL
#else
#define IDENT_ADDR 0xfffffc0000000000UL
#endif
/*
* 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.
*/
extern inline void __set_hae(unsigned long new_hae)
{
unsigned long flags = swpipl(IPL_MAX);
barrier();
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;
setipl(flags);
barrier();
}
extern 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.
*/
#ifdef USE_48_BIT_KSEG
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);
}
#else
static inline unsigned long virt_to_phys(void *address)
{
unsigned long phys = (unsigned long)address;
/* Sign-extend from bit 41. */
phys <<= (64 - 41);
phys = (long)phys >> (64 - 41);
/* Crop to the physical address width of the processor. */
phys &= (1ul << hwrpb->pa_bits) - 1;
return phys;
}
static inline void * phys_to_virt(unsigned long address)
{
return (void *)(IDENT_ADDR + (address & ((1ul << 41) - 1)));
}
#endif
#define page_to_phys(page) page_to_pa(page)
static inline dma_addr_t __deprecated isa_page_to_bus(struct page *page)
{
return page_to_phys(page);
}
/* Maximum PIO space address supported? */
#define IO_SPACE_LIMIT 0xffff
/*
* 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 DMA-mapping API.
*/
extern unsigned long __direct_map_base;
extern unsigned long __direct_map_size;
static inline unsigned long __deprecated 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;
}
#define isa_virt_to_bus virt_to_bus
static inline void * __deprecated 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;
}
#define isa_bus_to_virt bus_to_virt
/*
* There are different chipsets to interface the Alpha CPUs to the world.
*/
#define IO_CONCAT(a,b) _IO_CONCAT(a,b)
#define _IO_CONCAT(a,b) a ## _ ## b
#ifdef CONFIG_ALPHA_GENERIC
/* In a generic kernel, we always go through the machine vector. */
#define REMAP1(TYPE, NAME, QUAL) \
static inline TYPE generic_##NAME(QUAL void __iomem *addr) \
{ \
return alpha_mv.mv_##NAME(addr); \
}
#define REMAP2(TYPE, NAME, QUAL) \
static inline void generic_##NAME(TYPE b, QUAL void __iomem *addr) \
{ \
alpha_mv.mv_##NAME(b, addr); \
}
REMAP1(unsigned int, ioread8, /**/)
REMAP1(unsigned int, ioread16, /**/)
REMAP1(unsigned int, ioread32, /**/)
REMAP1(u8, readb, const volatile)
REMAP1(u16, readw, const volatile)
REMAP1(u32, readl, const volatile)
REMAP1(u64, readq, const volatile)
REMAP2(u8, iowrite8, /**/)
REMAP2(u16, iowrite16, /**/)
REMAP2(u32, iowrite32, /**/)
REMAP2(u8, writeb, volatile)
REMAP2(u16, writew, volatile)
REMAP2(u32, writel, volatile)
REMAP2(u64, writeq, volatile)
#undef REMAP1
#undef REMAP2
extern inline void __iomem *generic_ioportmap(unsigned long a)
{
return alpha_mv.mv_ioportmap(a);
}
static inline void __iomem *generic_ioremap(unsigned long a, unsigned long s)
{
return alpha_mv.mv_ioremap(a, s);
}
static inline void generic_iounmap(volatile void __iomem *a)
{
return alpha_mv.mv_iounmap(a);
}
static inline int generic_is_ioaddr(unsigned long a)
{
return alpha_mv.mv_is_ioaddr(a);
}
static inline int generic_is_mmio(const volatile void __iomem *a)
{
return alpha_mv.mv_is_mmio(a);
}
#define __IO_PREFIX generic
#define generic_trivial_rw_bw 0
#define generic_trivial_rw_lq 0
#define generic_trivial_io_bw 0
#define generic_trivial_io_lq 0
#define generic_trivial_iounmap 0
#else
#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_MARVEL)
# include <asm/core_marvel.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
#endif /* GENERIC */
/*
* We always have external versions of these routines.
*/
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 b, unsigned long port);
extern void outl(u32 b, unsigned long port);
extern u8 readb(const volatile void __iomem *addr);
extern u16 readw(const volatile void __iomem *addr);
extern u32 readl(const volatile void __iomem *addr);
extern u64 readq(const volatile void __iomem *addr);
extern void writeb(u8 b, volatile void __iomem *addr);
extern void writew(u16 b, volatile void __iomem *addr);
extern void writel(u32 b, volatile void __iomem *addr);
extern void writeq(u64 b, volatile void __iomem *addr);
extern u8 __raw_readb(const volatile void __iomem *addr);
extern u16 __raw_readw(const volatile void __iomem *addr);
extern u32 __raw_readl(const volatile void __iomem *addr);
extern u64 __raw_readq(const volatile void __iomem *addr);
extern void __raw_writeb(u8 b, volatile void __iomem *addr);
extern void __raw_writew(u16 b, volatile void __iomem *addr);
extern void __raw_writel(u32 b, volatile void __iomem *addr);
extern void __raw_writeq(u64 b, volatile void __iomem *addr);
/*
* Mapping from port numbers to __iomem space is pretty easy.
*/
/* These two have to be extern inline because of the extern prototype from
<asm-generic/iomap.h>. It is not legal to mix "extern" and "static" for
the same declaration. */
extern inline void __iomem *ioport_map(unsigned long port, unsigned int size)
{
return IO_CONCAT(__IO_PREFIX,ioportmap) (port);
}
extern inline void ioport_unmap(void __iomem *addr)
{
}
static inline void __iomem *ioremap(unsigned long port, unsigned long size)
{
return IO_CONCAT(__IO_PREFIX,ioremap) (port, size);
}
static inline void __iomem *__ioremap(unsigned long port, unsigned long size,
unsigned long flags)
{
return ioremap(port, size);
}
static inline void __iomem * ioremap_nocache(unsigned long offset,
unsigned long size)
{
return ioremap(offset, size);
}
#define ioremap_uc ioremap_nocache
static inline void iounmap(volatile void __iomem *addr)
{
IO_CONCAT(__IO_PREFIX,iounmap)(addr);
}
static inline int __is_ioaddr(unsigned long addr)
{
return IO_CONCAT(__IO_PREFIX,is_ioaddr)(addr);
}
#define __is_ioaddr(a) __is_ioaddr((unsigned long)(a))
static inline int __is_mmio(const volatile void __iomem *addr)
{
return IO_CONCAT(__IO_PREFIX,is_mmio)(addr);
}
/*
* If the actual I/O bits are sufficiently trivial, then expand inline.
*/
#if IO_CONCAT(__IO_PREFIX,trivial_io_bw)
extern inline unsigned int ioread8(void __iomem *addr)
{
unsigned int ret = IO_CONCAT(__IO_PREFIX,ioread8)(addr);
mb();
return ret;
}
extern inline unsigned int ioread16(void __iomem *addr)
{
unsigned int ret = IO_CONCAT(__IO_PREFIX,ioread16)(addr);
mb();
return ret;
}
extern inline void iowrite8(u8 b, void __iomem *addr)
{
IO_CONCAT(__IO_PREFIX,iowrite8)(b, addr);
mb();
}
extern inline void iowrite16(u16 b, void __iomem *addr)
{
IO_CONCAT(__IO_PREFIX,iowrite16)(b, addr);
mb();
}
extern inline u8 inb(unsigned long port)
{
return ioread8(ioport_map(port, 1));
}
extern inline u16 inw(unsigned long port)
{
return ioread16(ioport_map(port, 2));
}
extern inline void outb(u8 b, unsigned long port)
{
iowrite8(b, ioport_map(port, 1));
}
extern inline void outw(u16 b, unsigned long port)
{
iowrite16(b, ioport_map(port, 2));
}
#endif
#if IO_CONCAT(__IO_PREFIX,trivial_io_lq)
extern inline unsigned int ioread32(void __iomem *addr)
{
unsigned int ret = IO_CONCAT(__IO_PREFIX,ioread32)(addr);
mb();
return ret;
}
extern inline void iowrite32(u32 b, void __iomem *addr)
{
IO_CONCAT(__IO_PREFIX,iowrite32)(b, addr);
mb();
}
extern inline u32 inl(unsigned long port)
{
return ioread32(ioport_map(port, 4));
}
extern inline void outl(u32 b, unsigned long port)
{
iowrite32(b, ioport_map(port, 4));
}
#endif
#if IO_CONCAT(__IO_PREFIX,trivial_rw_bw) == 1
extern inline u8 __raw_readb(const volatile void __iomem *addr)
{
return IO_CONCAT(__IO_PREFIX,readb)(addr);
}
extern inline u16 __raw_readw(const volatile void __iomem *addr)
{
return IO_CONCAT(__IO_PREFIX,readw)(addr);
}
extern inline void __raw_writeb(u8 b, volatile void __iomem *addr)
{
IO_CONCAT(__IO_PREFIX,writeb)(b, addr);
}
extern inline void __raw_writew(u16 b, volatile void __iomem *addr)
{
IO_CONCAT(__IO_PREFIX,writew)(b, addr);
}
extern inline u8 readb(const volatile void __iomem *addr)
{
u8 ret = __raw_readb(addr);
mb();
return ret;
}
extern inline u16 readw(const volatile void __iomem *addr)
{
u16 ret = __raw_readw(addr);
mb();
return ret;
}
extern inline void writeb(u8 b, volatile void __iomem *addr)
{
__raw_writeb(b, addr);
mb();
}
extern inline void writew(u16 b, volatile void __iomem *addr)
{
__raw_writew(b, addr);
mb();
}
#endif
#if IO_CONCAT(__IO_PREFIX,trivial_rw_lq) == 1
extern inline u32 __raw_readl(const volatile void __iomem *addr)
{
return IO_CONCAT(__IO_PREFIX,readl)(addr);
}
extern inline u64 __raw_readq(const volatile void __iomem *addr)
{
return IO_CONCAT(__IO_PREFIX,readq)(addr);
}
extern inline void __raw_writel(u32 b, volatile void __iomem *addr)
{
IO_CONCAT(__IO_PREFIX,writel)(b, addr);
}
extern inline void __raw_writeq(u64 b, volatile void __iomem *addr)
{
IO_CONCAT(__IO_PREFIX,writeq)(b, addr);
}
extern inline u32 readl(const volatile void __iomem *addr)
{
u32 ret = __raw_readl(addr);
mb();
return ret;
}
extern inline u64 readq(const volatile void __iomem *addr)
{
u64 ret = __raw_readq(addr);
mb();
return ret;
}
extern inline void writel(u32 b, volatile void __iomem *addr)
{
__raw_writel(b, addr);
mb();
}
extern inline void writeq(u64 b, volatile void __iomem *addr)
{
__raw_writeq(b, addr);
mb();
}
#endif
#define ioread16be(p) be16_to_cpu(ioread16(p))
#define ioread32be(p) be32_to_cpu(ioread32(p))
#define iowrite16be(v,p) iowrite16(cpu_to_be16(v), (p))
#define iowrite32be(v,p) iowrite32(cpu_to_be32(v), (p))
#define inb_p inb
#define inw_p inw
#define inl_p inl
#define outb_p outb
#define outw_p outw
#define outl_p outl
#define readb_relaxed(addr) __raw_readb(addr)
#define readw_relaxed(addr) __raw_readw(addr)
#define readl_relaxed(addr) __raw_readl(addr)
#define readq_relaxed(addr) __raw_readq(addr)
#define writeb_relaxed(b, addr) __raw_writeb(b, addr)
#define writew_relaxed(b, addr) __raw_writew(b, addr)
#define writel_relaxed(b, addr) __raw_writel(b, addr)
#define writeq_relaxed(b, addr) __raw_writeq(b, addr)
#define mmiowb()
/*
* String version of IO memory access ops:
*/
extern void memcpy_fromio(void *, const volatile void __iomem *, long);
extern void memcpy_toio(volatile void __iomem *, const void *, long);
extern void _memset_c_io(volatile void __iomem *, unsigned long, long);
static inline void memset_io(volatile void __iomem *addr, u8 c, long len)
{
_memset_c_io(addr, 0x0101010101010101UL * c, len);
}
#define __HAVE_ARCH_MEMSETW_IO
static inline void memsetw_io(volatile void __iomem *addr, u16 c, long len)
{
_memset_c_io(addr, 0x0001000100010001UL * 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);
/*
* 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
/*
* Some mucking forons use if[n]def writeq to check if platform has it.
* It's a bloody bad idea and we probably want ARCH_HAS_WRITEQ for them
* to play with; for now just use cpp anti-recursion logics and make sure
* that damn thing is defined and expands to itself.
*/
#define writeq writeq
#define readq readq
/*
* Convert a physical pointer to a virtual kernel pointer for /dev/mem
* access
*/
#define xlate_dev_mem_ptr(p) __va(p)
/*
* Convert a virtual cached pointer to an uncached pointer
*/
#define xlate_dev_kmem_ptr(p) p
#endif /* __KERNEL__ */
#endif /* __ALPHA_IO_H */