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 <asm/vectors.h> 18 #include <linux/bug.h> 19 #include <linux/kernel.h> 20 21 #include <linux/types.h> 22 23 #define IOADDR(x) (XCHAL_KIO_BYPASS_VADDR + (x)) 24 #define IO_SPACE_LIMIT ~0 25 26 #ifdef CONFIG_MMU 27 28 #if XCHAL_HAVE_PTP_MMU && XCHAL_HAVE_SPANNING_WAY && CONFIG_OF 29 extern unsigned long xtensa_kio_paddr; 30 31 static inline unsigned long xtensa_get_kio_paddr(void) 32 { 33 return xtensa_kio_paddr; 34 } 35 #endif 36 37 /* 38 * Return the virtual address for the specified bus memory. 39 * Note that we currently don't support any address outside the KIO segment. 40 */ 41 static inline void __iomem *ioremap_nocache(unsigned long offset, 42 unsigned long size) 43 { 44 if (offset >= XCHAL_KIO_PADDR 45 && offset - XCHAL_KIO_PADDR < XCHAL_KIO_SIZE) 46 return (void*)(offset-XCHAL_KIO_PADDR+XCHAL_KIO_BYPASS_VADDR); 47 else 48 BUG(); 49 } 50 51 static inline void __iomem *ioremap_cache(unsigned long offset, 52 unsigned long size) 53 { 54 if (offset >= XCHAL_KIO_PADDR 55 && offset - XCHAL_KIO_PADDR < XCHAL_KIO_SIZE) 56 return (void*)(offset-XCHAL_KIO_PADDR+XCHAL_KIO_CACHED_VADDR); 57 else 58 BUG(); 59 } 60 61 #define ioremap_wc ioremap_nocache 62 63 static inline void __iomem *ioremap(unsigned long offset, unsigned long size) 64 { 65 return ioremap_nocache(offset, size); 66 } 67 68 static inline void iounmap(volatile void __iomem *addr) 69 { 70 } 71 72 #define virt_to_bus virt_to_phys 73 #define bus_to_virt phys_to_virt 74 75 #endif /* CONFIG_MMU */ 76 77 /* 78 * Generic I/O 79 */ 80 #define readb_relaxed readb 81 #define readw_relaxed readw 82 #define readl_relaxed readl 83 84 #endif /* __KERNEL__ */ 85 86 #include <asm-generic/io.h> 87 88 #endif /* _XTENSA_IO_H */ 89