| /* |
| * This file is subject to the terms and conditions of the GNU General Public |
| * License. See the file "COPYING" in the main directory of this archive |
| * for more details. |
| * |
| * Copyright (C) 1994, 1995 Waldorf GmbH |
| * Copyright (C) 1994 - 2000 Ralf Baechle |
| * Copyright (C) 1999, 2000 Silicon Graphics, Inc. |
| * Copyright (C) 2000 FSMLabs, Inc. |
| */ |
| #ifndef _ASM_IO_H |
| #define _ASM_IO_H |
| |
| #include <linux/config.h> |
| #include <linux/pagemap.h> |
| #include <linux/types.h> |
| #include <asm/addrspace.h> |
| #include <asm/pgtable-bits.h> |
| #include <asm/byteorder.h> |
| |
| #ifdef CONFIG_SGI_IP27 |
| extern unsigned long bus_to_baddr[256]; |
| |
| #define bus_to_baddr(bus, addr) (bus_to_baddr[(bus)->number] + (addr)) |
| #define baddr_to_bus(bus, addr) ((addr) - bus_to_baddr[(bus)->number]) |
| #define __swizzle_addr_w(port) ((port) ^ 2) |
| #else |
| #define bus_to_baddr(bus, addr) (addr) |
| #define baddr_to_bus(bus, addr) (addr) |
| #define __swizzle_addr_w(port) (port) |
| #endif |
| |
| /* |
| * Slowdown I/O port space accesses for antique hardware. |
| */ |
| #undef CONF_SLOWDOWN_IO |
| |
| /* |
| * Sane hardware offers swapping of I/O space accesses in hardware; less |
| * sane hardware forces software to fiddle with this. Totally insane hardware |
| * introduces special cases like: |
| * |
| * IP22 seems braindead enough to swap 16-bits values in hardware, but not |
| * 32-bits. Go figure... Can't tell without documentation. |
| * |
| * We only do the swapping to keep the kernel config bits of bi-endian |
| * machines a bit saner. |
| */ |
| #if defined(CONFIG_SWAP_IO_SPACE_W) && defined(__MIPSEB__) |
| #define __ioswab16(x) swab16(x) |
| #else |
| #define __ioswab16(x) (x) |
| #endif |
| #if defined(CONFIG_SWAP_IO_SPACE_L) && defined(__MIPSEB__) |
| #define __ioswab32(x) swab32(x) |
| #else |
| #define __ioswab32(x) (x) |
| #endif |
| |
| /* |
| * Change "struct page" to physical address. |
| */ |
| #ifdef CONFIG_64BIT_PHYS_ADDR |
| #define page_to_phys(page) ((u64)(page - mem_map) << PAGE_SHIFT) |
| #else |
| #define page_to_phys(page) ((page - mem_map) << PAGE_SHIFT) |
| #endif |
| |
| #define IO_SPACE_LIMIT 0xffff |
| |
| extern void * __ioremap(phys_t offset, phys_t size, unsigned long flags); |
| |
| /* |
| * ioremap - map bus memory into CPU space |
| * @offset: bus address of the memory |
| * @size: size of the resource to map |
| * |
| * ioremap performs a platform specific sequence of operations to |
| * make bus memory CPU accessible via the readb/readw/readl/writeb/ |
| * writew/writel functions and the other mmio helpers. The returned |
| * address is not guaranteed to be usable directly as a virtual |
| * address. |
| */ |
| |
| #define ioremap(offset, size) \ |
| __ioremap((offset), (size), _CACHE_UNCACHED) |
| |
| /* |
| * ioremap_nocache - map bus memory into CPU space |
| * @offset: bus address of the memory |
| * @size: size of the resource to map |
| * |
| * ioremap_nocache performs a platform specific sequence of operations to |
| * make bus memory CPU accessible via the readb/readw/readl/writeb/ |
| * writew/writel functions and the other mmio helpers. The returned |
| * address is not guaranteed to be usable directly as a virtual |
| * address. |
| * |
| * This version of ioremap ensures that the memory is marked uncachable |
| * on the CPU as well as honouring existing caching rules from things like |
| * the PCI bus. Note that there are other caches and buffers on many |
| * busses. In paticular driver authors should read up on PCI writes |
| * |
| * It's useful if some control registers are in such an area and |
| * write combining or read caching is not desirable: |
| */ |
| #define ioremap_nocache(offset, size) \ |
| __ioremap((offset), (size), _CACHE_UNCACHED) |
| #define ioremap_cacheable_cow(offset, size) \ |
| __ioremap((offset), (size), _CACHE_CACHABLE_COW) |
| #define ioremap_uncached_accelerated(offset, size) \ |
| __ioremap((offset), (size), _CACHE_UNCACHED_ACCELERATED) |
| |
| extern void iounmap(void *addr); |
| |
| /* |
| * XXX We need system specific versions of these to handle EISA address bits |
| * 24-31 on SNI. |
| * XXX more SNI hacks. |
| */ |
| #define readb(addr) (*(volatile unsigned char *)(addr)) |
| #define readw(addr) __ioswab16((*(volatile unsigned short *)(addr))) |
| #define readl(addr) __ioswab32((*(volatile unsigned int *)(addr))) |
| |
| #define __raw_readb(addr) (*(volatile unsigned char *)(addr)) |
| #define __raw_readw(addr) (*(volatile unsigned short *)(addr)) |
| #define __raw_readl(addr) (*(volatile unsigned int *)(addr)) |
| |
| #define writeb(b,addr) ((*(volatile unsigned char *)(addr)) = (b)) |
| #define writew(b,addr) ((*(volatile unsigned short *)(addr)) = (__ioswab16(b))) |
| #define writel(b,addr) ((*(volatile unsigned int *)(addr)) = (__ioswab32(b))) |
| |
| #define __raw_writeb(b,addr) ((*(volatile unsigned char *)(addr)) = (b)) |
| #define __raw_writew(w,addr) ((*(volatile unsigned short *)(addr)) = (w)) |
| #define __raw_writel(l,addr) ((*(volatile unsigned int *)(addr)) = (l)) |
| |
| /* |
| * TODO: Should use variants that don't do prefetching. |
| */ |
| #define memset_io(a,b,c) memset((void *)(a),(b),(c)) |
| #define memcpy_fromio(a,b,c) memcpy((a),(void *)(b),(c)) |
| #define memcpy_toio(a,b,c) memcpy((void *)(a),(b),(c)) |
| |
| /* |
| * isa_slot_offset is the address where E(ISA) busaddress 0 is mapped |
| * for the processor. This implies the assumption that there is only |
| * one of these busses. |
| */ |
| extern unsigned long isa_slot_offset; |
| |
| /* |
| * ISA space is 'always mapped' on currently supported MIPS systems, no need |
| * to explicitly ioremap() it. The fact that the ISA IO space is mapped |
| * to PAGE_OFFSET is pure coincidence - it does not mean ISA values |
| * are physical addresses. The following constant pointer can be |
| * used as the IO-area pointer (it can be iounmapped as well, so the |
| * analogy with PCI is quite large): |
| */ |
| #define __ISA_IO_base ((char *)(isa_slot_offset)) |
| |
| #define isa_readb(a) readb(__ISA_IO_base + (a)) |
| #define isa_readw(a) readw(__ISA_IO_base + (a)) |
| #define isa_readl(a) readl(__ISA_IO_base + (a)) |
| #define isa_writeb(b,a) writeb(b,__ISA_IO_base + (a)) |
| #define isa_writew(w,a) writew(w,__ISA_IO_base + (a)) |
| #define isa_writel(l,a) writel(l,__ISA_IO_base + (a)) |
| #define isa_memset_io(a,b,c) memset_io(__ISA_IO_base + (a),(b),(c)) |
| #define isa_memcpy_fromio(a,b,c) memcpy_fromio((a),__ISA_IO_base + (b),(c)) |
| #define isa_memcpy_toio(a,b,c) memcpy_toio(__ISA_IO_base + (a),(b),(c)) |
| |
| /* |
| * 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. |
| */ |
| #define eth_io_copy_and_sum(skb,src,len,unused) memcpy_fromio((skb)->data,(src),(len)) |
| #define isa_eth_io_copy_and_sum(a,b,c,d) eth_copy_and_sum((a),(b),(c),(d)) |
| |
| /* |
| * check_signature - find BIOS signatures |
| * @io_addr: mmio address to check |
| * @signature: signature block |
| * @length: length of signature |
| * |
| * Perform a signature comparison with the mmio address io_addr. This |
| * address should have been obtained by ioremap. |
| * Returns 1 on a match. |
| */ |
| 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_check_signature - find BIOS signatures |
| * @io_addr: mmio address to check |
| * @signature: signature block |
| * @length: length of signature |
| * |
| * Perform a signature comparison with the ISA mmio address io_addr. |
| * Returns 1 on a match. |
| * |
| * This function is deprecated. New drivers should use ioremap and |
| * check_signature. |
| */ |
| |
| 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; |
| } |
| |
| /* |
| * virt_to_phys - map virtual addresses to physical |
| * @address: address to remap |
| * |
| * The returned physical address is the physical (CPU) mapping for |
| * the memory address given. It is only valid to use this function on |
| * addresses directly mapped or allocated via kmalloc. |
| * |
| * This function does not give bus mappings for DMA transfers. In |
| * almost all conceivable cases a device driver should not be using |
| * this function |
| */ |
| |
| static inline unsigned long virt_to_phys(volatile void * address) |
| { |
| return (unsigned long)address - PAGE_OFFSET; |
| } |
| |
| /* |
| * phys_to_virt - map physical address to virtual |
| * @address: address to remap |
| * |
| * The returned virtual address is a current CPU mapping for |
| * the memory address given. It is only valid to use this function on |
| * addresses that have a kernel mapping |
| * |
| * This function does not handle bus mappings for DMA transfers. In |
| * almost all conceivable cases a device driver should not be using |
| * this function |
| */ |
| |
| static inline void * phys_to_virt(unsigned long address) |
| { |
| return (void *)(address + PAGE_OFFSET); |
| } |
| |
| /* |
| * IO bus memory addresses are also 1:1 with the physical address |
| */ |
| static inline unsigned long virt_to_bus(volatile void * address) |
| { |
| return (unsigned long)address - PAGE_OFFSET; |
| } |
| |
| static inline void * bus_to_virt(unsigned long address) |
| { |
| return (void *)(address + PAGE_OFFSET); |
| } |
| |
| /* This is too simpleminded for more sophisticated than dumb hardware ... */ |
| #define page_to_bus page_to_phys |
| |
| /* |
| * On MIPS I/O ports are memory mapped, so we access them using normal |
| * load/store instructions. mips_io_port_base is the virtual address to |
| * which all ports are being mapped. For sake of efficiency some code |
| * assumes that this is an address that can be loaded with a single lui |
| * instruction, so the lower 16 bits must be zero. Should be true on |
| * on any sane architecture; generic code does not use this assumption. |
| */ |
| extern const unsigned long mips_io_port_base; |
| |
| #define set_io_port_base(base) \ |
| do { * (unsigned long *) &mips_io_port_base = (base); } while (0) |
| |
| #define __SLOW_DOWN_IO \ |
| __asm__ __volatile__( \ |
| "sb\t$0,0x80(%0)" \ |
| : : "r" (mips_io_port_base)); |
| |
| #ifdef CONF_SLOWDOWN_IO |
| #ifdef REALLY_SLOW_IO |
| #define SLOW_DOWN_IO { __SLOW_DOWN_IO; __SLOW_DOWN_IO; __SLOW_DOWN_IO; __SLOW_DOWN_IO; } |
| #else |
| #define SLOW_DOWN_IO __SLOW_DOWN_IO |
| #endif |
| #else |
| #define SLOW_DOWN_IO |
| #endif |
| |
| #define outb(val,port) \ |
| do { \ |
| *(volatile u8 *)(mips_io_port_base + (port)) = (val); \ |
| } while(0) |
| |
| #define outw(val,port) \ |
| do { \ |
| *(volatile u16 *)(mips_io_port_base + __swizzle_addr_w(port)) = \ |
| __ioswab16(val); \ |
| } while(0) |
| |
| #define outl(val,port) \ |
| do { \ |
| *(volatile u32 *)(mips_io_port_base + (port)) = __ioswab32(val);\ |
| } while(0) |
| |
| #define outb_p(val,port) \ |
| do { \ |
| *(volatile u8 *)(mips_io_port_base + (port)) = (val); \ |
| SLOW_DOWN_IO; \ |
| } while(0) |
| |
| #define outw_p(val,port) \ |
| do { \ |
| *(volatile u16 *)(mips_io_port_base + __swizzle_addr_w(port)) = \ |
| __ioswab16(val); \ |
| SLOW_DOWN_IO; \ |
| } while(0) |
| |
| #define outl_p(val,port) \ |
| do { \ |
| *(volatile u32 *)(mips_io_port_base + (port)) = __ioswab32(val);\ |
| SLOW_DOWN_IO; \ |
| } while(0) |
| |
| static inline unsigned char inb(unsigned long port) |
| { |
| return *(volatile u8 *)(mips_io_port_base + port); |
| } |
| |
| static inline unsigned short inw(unsigned long port) |
| { |
| port = __swizzle_addr_w(port); |
| |
| return __ioswab16(*(volatile u16 *)(mips_io_port_base + port)); |
| } |
| |
| static inline unsigned int inl(unsigned long port) |
| { |
| return __ioswab32(*(volatile u32 *)(mips_io_port_base + port)); |
| } |
| |
| static inline unsigned char inb_p(unsigned long port) |
| { |
| u8 __val; |
| |
| __val = *(volatile u8 *)(mips_io_port_base + port); |
| SLOW_DOWN_IO; |
| |
| return __val; |
| } |
| |
| static inline unsigned short inw_p(unsigned long port) |
| { |
| u16 __val; |
| |
| port = __swizzle_addr_w(port); |
| __val = *(volatile u16 *)(mips_io_port_base + port); |
| SLOW_DOWN_IO; |
| |
| return __ioswab16(__val); |
| } |
| |
| static inline unsigned int inl_p(unsigned long port) |
| { |
| u32 __val; |
| |
| __val = *(volatile u32 *)(mips_io_port_base + port); |
| SLOW_DOWN_IO; |
| return __ioswab32(__val); |
| } |
| |
| static inline void __outsb(unsigned long port, void *addr, unsigned int count) |
| { |
| while (count--) { |
| outb(*(u8 *)addr, port); |
| addr++; |
| } |
| } |
| |
| static inline void __insb(unsigned long port, void *addr, unsigned int count) |
| { |
| while (count--) { |
| *(u8 *)addr = inb(port); |
| addr++; |
| } |
| } |
| |
| static inline void __outsw(unsigned long port, void *addr, unsigned int count) |
| { |
| while (count--) { |
| outw(*(u16 *)addr, port); |
| addr += 2; |
| } |
| } |
| |
| static inline void __insw(unsigned long port, void *addr, unsigned int count) |
| { |
| while (count--) { |
| *(u16 *)addr = inw(port); |
| addr += 2; |
| } |
| } |
| |
| static inline void __outsl(unsigned long port, void *addr, unsigned int count) |
| { |
| while (count--) { |
| outl(*(u32 *)addr, port); |
| addr += 4; |
| } |
| } |
| |
| static inline void __insl(unsigned long port, void *addr, unsigned int count) |
| { |
| while (count--) { |
| *(u32 *)addr = inl(port); |
| addr += 4; |
| } |
| } |
| |
| #define outsb(port, addr, count) __outsb(port, addr, count) |
| #define insb(port, addr, count) __insb(port, addr, count) |
| #define outsw(port, addr, count) __outsw(port, addr, count) |
| #define insw(port, addr, count) __insw(port, addr, count) |
| #define outsl(port, addr, count) __outsl(port, addr, count) |
| #define insl(port, addr, count) __insl(port, addr, count) |
| |
| /* |
| * The caches on some architectures aren't dma-coherent and have need to |
| * handle this in software. There are three types of operations that |
| * can be applied to dma buffers. |
| * |
| * - dma_cache_wback_inv(start, size) makes caches and coherent by |
| * writing the content of the caches back to memory, if necessary. |
| * The function also invalidates the affected part of the caches as |
| * necessary before DMA transfers from outside to memory. |
| * - dma_cache_wback(start, size) makes caches and coherent by |
| * writing the content of the caches back to memory, if necessary. |
| * The function also invalidates the affected part of the caches as |
| * necessary before DMA transfers from outside to memory. |
| * - dma_cache_inv(start, size) invalidates the affected parts of the |
| * caches. Dirty lines of the caches may be written back or simply |
| * be discarded. This operation is necessary before dma operations |
| * to the memory. |
| */ |
| #ifdef CONFIG_NONCOHERENT_IO |
| |
| extern void (*_dma_cache_wback_inv)(unsigned long start, unsigned long size); |
| extern void (*_dma_cache_wback)(unsigned long start, unsigned long size); |
| extern void (*_dma_cache_inv)(unsigned long start, unsigned long size); |
| |
| #define dma_cache_wback_inv(start,size) _dma_cache_wback_inv(start,size) |
| #define dma_cache_wback(start,size) _dma_cache_wback(start,size) |
| #define dma_cache_inv(start,size) _dma_cache_inv(start,size) |
| |
| #else /* Sane hardware */ |
| |
| #define dma_cache_wback_inv(start,size) \ |
| do { (void) (start); (void) (size); } while (0) |
| #define dma_cache_wback(start,size) \ |
| do { (void) (start); (void) (size); } while (0) |
| #define dma_cache_inv(start,size) \ |
| do { (void) (start); (void) (size); } while (0) |
| |
| #endif /* CONFIG_NONCOHERENT_IO */ |
| |
| #endif /* _ASM_IO_H */ |