1 /* 2 * include/asm-xtensa/io.h 3 * 4 * This file is subject to the terms and conditions of the GNU General Public 5 * License. See the file "COPYING" in the main directory of this archive 6 * for more details. 7 * 8 * Copyright (C) 2001 - 2005 Tensilica Inc. 9 */ 10 11 #ifndef _XTENSA_IO_H 12 #define _XTENSA_IO_H 13 14 #ifdef __KERNEL__ 15 #include <asm/byteorder.h> 16 #include <asm/page.h> 17 #include <linux/bug.h> 18 #include <linux/kernel.h> 19 20 #include <linux/types.h> 21 22 #define XCHAL_KIO_CACHED_VADDR 0xe0000000 23 #define XCHAL_KIO_BYPASS_VADDR 0xf0000000 24 #define XCHAL_KIO_PADDR 0xf0000000 25 #define XCHAL_KIO_SIZE 0x10000000 26 27 #define IOADDR(x) (XCHAL_KIO_BYPASS_VADDR + (x)) 28 #define IO_SPACE_LIMIT ~0 29 30 #ifdef CONFIG_MMU 31 /* 32 * Return the virtual address for the specified bus memory. 33 * Note that we currently don't support any address outside the KIO segment. 34 */ 35 static inline void __iomem *ioremap_nocache(unsigned long offset, 36 unsigned long size) 37 { 38 if (offset >= XCHAL_KIO_PADDR 39 && offset - XCHAL_KIO_PADDR < XCHAL_KIO_SIZE) 40 return (void*)(offset-XCHAL_KIO_PADDR+XCHAL_KIO_BYPASS_VADDR); 41 else 42 BUG(); 43 } 44 45 static inline void __iomem *ioremap_cache(unsigned long offset, 46 unsigned long size) 47 { 48 if (offset >= XCHAL_KIO_PADDR 49 && offset - XCHAL_KIO_PADDR < XCHAL_KIO_SIZE) 50 return (void*)(offset-XCHAL_KIO_PADDR+XCHAL_KIO_CACHED_VADDR); 51 else 52 BUG(); 53 } 54 55 #define ioremap_wc ioremap_nocache 56 57 static inline void __iomem *ioremap(unsigned long offset, unsigned long size) 58 { 59 return ioremap_nocache(offset, size); 60 } 61 62 static inline void iounmap(volatile void __iomem *addr) 63 { 64 } 65 #endif /* CONFIG_MMU */ 66 67 /* 68 * Generic I/O 69 */ 70 #define readb_relaxed readb 71 #define readw_relaxed readw 72 #define readl_relaxed readl 73 74 #endif /* __KERNEL__ */ 75 76 #include <asm-generic/io.h> 77 78 #endif /* _XTENSA_IO_H */ 79