1 /* 2 * linux/arch/unicore32/include/asm/io.h 3 * 4 * Code specific to PKUnity SoC and UniCore ISA 5 * 6 * Copyright (C) 2001-2010 GUAN Xue-tao 7 * 8 * This program is free software; you can redistribute it and/or modify 9 * it under the terms of the GNU General Public License version 2 as 10 * published by the Free Software Foundation. 11 */ 12 #ifndef __UNICORE_IO_H__ 13 #define __UNICORE_IO_H__ 14 15 #ifdef __KERNEL__ 16 17 #include <asm/byteorder.h> 18 #include <asm/memory.h> 19 20 #define PCI_IOBASE PKUNITY_PCILIO_BASE 21 #include <asm-generic/io.h> 22 23 /* 24 * __uc32_ioremap and __uc32_ioremap_cached takes CPU physical address. 25 */ 26 extern void __iomem *__uc32_ioremap(unsigned long, size_t); 27 extern void __iomem *__uc32_ioremap_cached(unsigned long, size_t); 28 extern void __uc32_iounmap(volatile void __iomem *addr); 29 30 /* 31 * ioremap and friends. 32 * 33 * ioremap takes a PCI memory address, as specified in 34 * Documentation/io-mapping.txt. 35 * 36 */ 37 #define ioremap(cookie, size) __uc32_ioremap(cookie, size) 38 #define ioremap_cached(cookie, size) __uc32_ioremap_cached(cookie, size) 39 #define ioremap_nocache(cookie, size) __uc32_ioremap(cookie, size) 40 #define iounmap(cookie) __uc32_iounmap(cookie) 41 42 #define readb_relaxed readb 43 #define readw_relaxed readw 44 #define readl_relaxed readl 45 46 #define HAVE_ARCH_PIO_SIZE 47 #define PIO_OFFSET (unsigned int)(PCI_IOBASE) 48 #define PIO_MASK (unsigned int)(IO_SPACE_LIMIT) 49 #define PIO_RESERVED (PIO_OFFSET + PIO_MASK + 1) 50 51 #ifdef CONFIG_STRICT_DEVMEM 52 53 #include <linux/ioport.h> 54 #include <linux/mm.h> 55 56 /* 57 * devmem_is_allowed() checks to see if /dev/mem access to a certain 58 * address is valid. The argument is a physical page number. 59 * We mimic x86 here by disallowing access to system RAM as well as 60 * device-exclusive MMIO regions. This effectively disable read()/write() 61 * on /dev/mem. 62 */ devmem_is_allowed(unsigned long pfn)63static inline int devmem_is_allowed(unsigned long pfn) 64 { 65 if (iomem_is_exclusive(pfn << PAGE_SHIFT)) 66 return 0; 67 if (!page_is_ram(pfn)) 68 return 1; 69 return 0; 70 } 71 72 #endif /* CONFIG_STRICT_DEVMEM */ 73 74 #endif /* __KERNEL__ */ 75 #endif /* __UNICORE_IO_H__ */ 76