- 根目录:
- arch
- tile
- include
- asm
- io.h
/*
* Copyright 2010 Tilera Corporation. All Rights Reserved.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation, version 2.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
* NON INFRINGEMENT. See the GNU General Public License for
* more details.
*/
#ifndef _ASM_TILE_IO_H
#define _ASM_TILE_IO_H
#include <linux/kernel.h>
#include <linux/bug.h>
#include <asm/page.h>
/* Maximum PCI I/O space address supported. */
#define IO_SPACE_LIMIT 0xffffffff
/*
* 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
/*
* Change "struct page" to physical address.
*/
#define page_to_phys(page) ((dma_addr_t)page_to_pfn(page) << PAGE_SHIFT)
/*
* Some places try to pass in an loff_t for PHYSADDR (?!), so we cast it to
* long before casting it to a pointer to avoid compiler warnings.
*/
#if CHIP_HAS_MMIO()
extern void __iomem *ioremap(resource_size_t offset, unsigned long size);
extern void __iomem *ioremap_prot(resource_size_t offset, unsigned long size,
pgprot_t pgprot);
extern void iounmap(volatile void __iomem *addr);
#else
#define ioremap(physaddr, size) ((void __iomem *)(unsigned long)(physaddr))
#define iounmap(addr) ((void)0)
#endif
#define ioremap_nocache(physaddr, size) ioremap(physaddr, size)
#define ioremap_wc(physaddr, size) ioremap(physaddr, size)
#define ioremap_writethrough(physaddr, size) ioremap(physaddr, size)
#define ioremap_fullcache(physaddr, size) ioremap(physaddr, size)
#define mmiowb()
/* Conversion between virtual and physical mappings. */
#define mm_ptov(addr) ((void *)phys_to_virt(addr))
#define mm_vtop(addr) ((unsigned long)virt_to_phys(addr))
#if CHIP_HAS_MMIO()
/*
* We use inline assembly to guarantee that the compiler does not
* split an access into multiple byte-sized accesses as it might
* sometimes do if a register data structure is marked "packed".
* Obviously on tile we can't tolerate such an access being
* actually unaligned, but we want to avoid the case where the
* compiler conservatively would generate multiple accesses even
* for an aligned read or write.
*/
static inline u8 __raw_readb(const volatile void __iomem *addr)
{
return *(const volatile u8 __force *)addr;
}
static inline u16 __raw_readw(const volatile void __iomem *addr)
{
u16 ret;
asm volatile("ld2u %0, %1" : "=r" (ret) : "r" (addr));
barrier();
return le16_to_cpu(ret);
}
static inline u32 __raw_readl(const volatile void __iomem *addr)
{
u32 ret;
/* Sign-extend to conform to u32 ABI sign-extension convention. */
asm volatile("ld4s %0, %1" : "=r" (ret) : "r" (addr));
barrier();
return le32_to_cpu(ret);
}
static inline u64 __raw_readq(const volatile void __iomem *addr)
{
u64 ret;
asm volatile("ld %0, %1" : "=r" (ret) : "r" (addr));
barrier();
return le64_to_cpu(ret);
}
static inline void __raw_writeb(u8 val, volatile void __iomem *addr)
{
*(volatile u8 __force *)addr = val;
}
static inline void __raw_writew(u16 val, volatile void __iomem *addr)
{
asm volatile("st2 %0, %1" :: "r" (addr), "r" (cpu_to_le16(val)));
}
static inline void __raw_writel(u32 val, volatile void __iomem *addr)
{
asm volatile("st4 %0, %1" :: "r" (addr), "r" (cpu_to_le32(val)));
}
static inline void __raw_writeq(u64 val, volatile void __iomem *addr)
{
asm volatile("st %0, %1" :: "r" (addr), "r" (cpu_to_le64(val)));
}
/*
* The on-chip I/O hardware on tilegx is configured with VA=PA for the
* kernel's PA range. The low-level APIs and field names use "va" and
* "void *" nomenclature, to be consistent with the general notion
* that the addresses in question are virtualizable, but in the kernel
* context we are actually manipulating PA values. (In other contexts,
* e.g. access from user space, we do in fact use real virtual addresses
* in the va fields.) To allow readers of the code to understand what's
* happening, we direct their attention to this comment by using the
* following two functions that just duplicate __va() and __pa().
*/
typedef unsigned long tile_io_addr_t;
static inline tile_io_addr_t va_to_tile_io_addr(void *va)
{
BUILD_BUG_ON(sizeof(phys_addr_t) != sizeof(tile_io_addr_t));
return __pa(va);
}
static inline void *tile_io_addr_to_va(tile_io_addr_t tile_io_addr)
{
return __va(tile_io_addr);
}
#else /* CHIP_HAS_MMIO() */
#ifdef CONFIG_PCI
extern u8 _tile_readb(unsigned long addr);
extern u16 _tile_readw(unsigned long addr);
extern u32 _tile_readl(unsigned long addr);
extern u64 _tile_readq(unsigned long addr);
extern void _tile_writeb(u8 val, unsigned long addr);
extern void _tile_writew(u16 val, unsigned long addr);
extern void _tile_writel(u32 val, unsigned long addr);
extern void _tile_writeq(u64 val, unsigned long addr);
#define __raw_readb(addr) _tile_readb((unsigned long)addr)
#define __raw_readw(addr) _tile_readw((unsigned long)addr)
#define __raw_readl(addr) _tile_readl((unsigned long)addr)
#define __raw_readq(addr) _tile_readq((unsigned long)addr)
#define __raw_writeb(val, addr) _tile_writeb(val, (unsigned long)addr)
#define __raw_writew(val, addr) _tile_writew(val, (unsigned long)addr)
#define __raw_writel(val, addr) _tile_writel(val, (unsigned long)addr)
#define __raw_writeq(val, addr) _tile_writeq(val, (unsigned long)addr)
#else /* CONFIG_PCI */
/*
* The tilepro architecture does not support IOMEM unless PCI is enabled.
* Unfortunately we can't yet simply not declare these methods,
* since some generic code that compiles into the kernel, but
* we never run, uses them unconditionally.
*/
static inline int iomem_panic(void)
{
panic("readb/writeb and friends do not exist on tile without PCI");
return 0;
}
static inline u8 readb(unsigned long addr)
{
return iomem_panic();
}
static inline u16 _readw(unsigned long addr)
{
return iomem_panic();
}
static inline u32 readl(unsigned long addr)
{
return iomem_panic();
}
static inline u64 readq(unsigned long addr)
{
return iomem_panic();
}
static inline void writeb(u8 val, unsigned long addr)
{
iomem_panic();
}
static inline void writew(u16 val, unsigned long addr)
{
iomem_panic();
}
static inline void writel(u32 val, unsigned long addr)
{
iomem_panic();
}
static inline void writeq(u64 val, unsigned long addr)
{
iomem_panic();
}
#endif /* CONFIG_PCI */
#endif /* CHIP_HAS_MMIO() */
#define readb __raw_readb
#define readw __raw_readw
#define readl __raw_readl
#define readq __raw_readq
#define writeb __raw_writeb
#define writew __raw_writew
#define writel __raw_writel
#define writeq __raw_writeq
#define readb_relaxed readb
#define readw_relaxed readw
#define readl_relaxed readl
#define readq_relaxed readq
#define ioread8 readb
#define ioread16 readw
#define ioread32 readl
#define ioread64 readq
#define iowrite8 writeb
#define iowrite16 writew
#define iowrite32 writel
#define iowrite64 writeq
#if CHIP_HAS_MMIO() || defined(CONFIG_PCI)
static inline void memset_io(volatile void *dst, int val, size_t len)
{
size_t x;
BUG_ON((unsigned long)dst & 0x3);
val = (val & 0xff) * 0x01010101;
for (x = 0; x < len; x += 4)
writel(val, dst + x);
}
static inline void memcpy_fromio(void *dst, const volatile void __iomem *src,
size_t len)
{
size_t x;
BUG_ON((unsigned long)src & 0x3);
for (x = 0; x < len; x += 4)
*(u32 *)(dst + x) = readl(src + x);
}
static inline void memcpy_toio(volatile void __iomem *dst, const void *src,
size_t len)
{
size_t x;
BUG_ON((unsigned long)dst & 0x3);
for (x = 0; x < len; x += 4)
writel(*(u32 *)(src + x), dst + x);
}
#endif
#if CHIP_HAS_MMIO() && defined(CONFIG_TILE_PCI_IO)
static inline u8 inb(unsigned long addr)
{
return readb((volatile void __iomem *) addr);
}
static inline u16 inw(unsigned long addr)
{
return readw((volatile void __iomem *) addr);
}
static inline u32 inl(unsigned long addr)
{
return readl((volatile void __iomem *) addr);
}
static inline void outb(u8 b, unsigned long addr)
{
writeb(b, (volatile void __iomem *) addr);
}
static inline void outw(u16 b, unsigned long addr)
{
writew(b, (volatile void __iomem *) addr);
}
static inline void outl(u32 b, unsigned long addr)
{
writel(b, (volatile void __iomem *) addr);
}
static inline void insb(unsigned long addr, void *buffer, int count)
{
if (count) {
u8 *buf = buffer;
do {
u8 x = inb(addr);
*buf++ = x;
} while (--count);
}
}
static inline void insw(unsigned long addr, void *buffer, int count)
{
if (count) {
u16 *buf = buffer;
do {
u16 x = inw(addr);
*buf++ = x;
} while (--count);
}
}
static inline void insl(unsigned long addr, void *buffer, int count)
{
if (count) {
u32 *buf = buffer;
do {
u32 x = inl(addr);
*buf++ = x;
} while (--count);
}
}
static inline void outsb(unsigned long addr, const void *buffer, int count)
{
if (count) {
const u8 *buf = buffer;
do {
outb(*buf++, addr);
} while (--count);
}
}
static inline void outsw(unsigned long addr, const void *buffer, int count)
{
if (count) {
const u16 *buf = buffer;
do {
outw(*buf++, addr);
} while (--count);
}
}
static inline void outsl(unsigned long addr, const void *buffer, int count)
{
if (count) {
const u32 *buf = buffer;
do {
outl(*buf++, addr);
} while (--count);
}
}
extern void __iomem *ioport_map(unsigned long port, unsigned int len);
extern void ioport_unmap(void __iomem *addr);
#else
/*
* The TilePro architecture does not support IOPORT, even with PCI.
* Unfortunately we can't yet simply not declare these methods,
* since some generic code that compiles into the kernel, but
* we never run, uses them unconditionally.
*/
static inline long ioport_panic(void)
{
#ifdef __tilegx__
panic("PCI IO space support is disabled. Configure the kernel with"
" CONFIG_TILE_PCI_IO to enable it");
#else
panic("inb/outb and friends do not exist on tile");
#endif
return 0;
}
static inline void __iomem *ioport_map(unsigned long port, unsigned int len)
{
pr_info("ioport_map: mapping IO resources is unsupported on tile.\n");
return NULL;
}
static inline void ioport_unmap(void __iomem *addr)
{
ioport_panic();
}
static inline u8 inb(unsigned long addr)
{
return ioport_panic();
}
static inline u16 inw(unsigned long addr)
{
return ioport_panic();
}
static inline u32 inl(unsigned long addr)
{
return ioport_panic();
}
static inline void outb(u8 b, unsigned long addr)
{
ioport_panic();
}
static inline void outw(u16 b, unsigned long addr)
{
ioport_panic();
}
static inline void outl(u32 b, unsigned long addr)
{
ioport_panic();
}
static inline void insb(unsigned long addr, void *buffer, int count)
{
ioport_panic();
}
static inline void insw(unsigned long addr, void *buffer, int count)
{
ioport_panic();
}
static inline void insl(unsigned long addr, void *buffer, int count)
{
ioport_panic();
}
static inline void outsb(unsigned long addr, const void *buffer, int count)
{
ioport_panic();
}
static inline void outsw(unsigned long addr, const void *buffer, int count)
{
ioport_panic();
}
static inline void outsl(unsigned long addr, const void *buffer, int count)
{
ioport_panic();
}
#endif /* CHIP_HAS_MMIO() && defined(CONFIG_TILE_PCI_IO) */
#define inb_p(addr) inb(addr)
#define inw_p(addr) inw(addr)
#define inl_p(addr) inl(addr)
#define outb_p(x, addr) outb((x), (addr))
#define outw_p(x, addr) outw((x), (addr))
#define outl_p(x, addr) outl((x), (addr))
#define ioread16be(addr) be16_to_cpu(ioread16(addr))
#define ioread32be(addr) be32_to_cpu(ioread32(addr))
#define iowrite16be(v, addr) iowrite16(be16_to_cpu(v), (addr))
#define iowrite32be(v, addr) iowrite32(be32_to_cpu(v), (addr))
#define ioread8_rep(p, dst, count) \
insb((unsigned long) (p), (dst), (count))
#define ioread16_rep(p, dst, count) \
insw((unsigned long) (p), (dst), (count))
#define ioread32_rep(p, dst, count) \
insl((unsigned long) (p), (dst), (count))
#define iowrite8_rep(p, src, count) \
outsb((unsigned long) (p), (src), (count))
#define iowrite16_rep(p, src, count) \
outsw((unsigned long) (p), (src), (count))
#define iowrite32_rep(p, src, count) \
outsl((unsigned long) (p), (src), (count))
#define virt_to_bus virt_to_phys
#define bus_to_virt phys_to_virt
#endif /* _ASM_TILE_IO_H */