| /* | |
| * 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__ */ |