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author | André Fabian Silva Delgado <emulatorman@parabola.nu> | 2015-08-05 17:04:01 -0300 |
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committer | André Fabian Silva Delgado <emulatorman@parabola.nu> | 2015-08-05 17:04:01 -0300 |
commit | 57f0f512b273f60d52568b8c6b77e17f5636edc0 (patch) | |
tree | 5e910f0e82173f4ef4f51111366a3f1299037a7b /arch/unicore32/include/asm/io.h |
Initial import
Diffstat (limited to 'arch/unicore32/include/asm/io.h')
-rw-r--r-- | arch/unicore32/include/asm/io.h | 75 |
1 files changed, 75 insertions, 0 deletions
diff --git a/arch/unicore32/include/asm/io.h b/arch/unicore32/include/asm/io.h new file mode 100644 index 000000000..cb1d8fd2b --- /dev/null +++ b/arch/unicore32/include/asm/io.h @@ -0,0 +1,75 @@ +/* + * 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__ */ |