/* * linux/arch/unicore32/include/asm/io.h * * Code specific to PKUnity SoC and UniCore ISA * * Copyright (C) 2001-2010 GUAN Xue-tao * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License version 2 as * published by the Free Software Foundation. */ #ifndef __UNICORE_IO_H__ #define __UNICORE_IO_H__ #ifdef __KERNEL__ #include <asm/byteorder.h> #include <asm/memory.h> #define PCI_IOBASE PKUNITY_PCILIO_BASE #include <asm-generic/io.h> /* * __uc32_ioremap and __uc32_ioremap_cached takes CPU physical address. */ extern void __iomem *__uc32_ioremap(unsigned long, size_t); extern void __iomem *__uc32_ioremap_cached(unsigned long, size_t); extern void __uc32_iounmap(volatile void __iomem *addr); /* * ioremap and friends. * * ioremap takes a PCI memory address, as specified in * Documentation/io-mapping.txt. * */ #define ioremap(cookie, size) __uc32_ioremap(cookie, size) #define ioremap_cached(cookie, size) __uc32_ioremap_cached(cookie, size) #define ioremap_nocache(cookie, size) __uc32_ioremap(cookie, size) #define iounmap(cookie) __uc32_iounmap(cookie) #define readb_relaxed readb #define readw_relaxed readw #define readl_relaxed readl #define HAVE_ARCH_PIO_SIZE #define PIO_OFFSET (unsigned int)(PCI_IOBASE) #define PIO_MASK (unsigned int)(IO_SPACE_LIMIT) #define PIO_RESERVED (PIO_OFFSET + PIO_MASK + 1) #ifdef CONFIG_STRICT_DEVMEM #include <linux/ioport.h> #include <linux/mm.h> /* * devmem_is_allowed() checks to see if /dev/mem access to a certain * address is valid. The argument is a physical page number. * We mimic x86 here by disallowing access to system RAM as well as * device-exclusive MMIO regions. This effectively disable read()/write() * on /dev/mem. */ static inline int devmem_is_allowed(unsigned long pfn) { if (iomem_is_exclusive(pfn << PAGE_SHIFT)) return 0; if (!page_is_ram(pfn)) return 1; return 0; } #endif /* CONFIG_STRICT_DEVMEM */ #endif /* __KERNEL__ */ #endif /* __UNICORE_IO_H__ */