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Diffstat (limited to 'arch/hexagon/include/asm/io.h')
-rw-r--r-- | arch/hexagon/include/asm/io.h | 341 |
1 files changed, 341 insertions, 0 deletions
diff --git a/arch/hexagon/include/asm/io.h b/arch/hexagon/include/asm/io.h new file mode 100644 index 0000000000..e2b308e32a --- /dev/null +++ b/arch/hexagon/include/asm/io.h @@ -0,0 +1,341 @@ +/* SPDX-License-Identifier: GPL-2.0-only */ +/* + * IO definitions for the Hexagon architecture + * + * Copyright (c) 2010-2013, The Linux Foundation. All rights reserved. + */ + +#ifndef _ASM_IO_H +#define _ASM_IO_H + +#ifdef __KERNEL__ + +#include <linux/types.h> +#include <asm/iomap.h> +#include <asm/page.h> +#include <asm/cacheflush.h> + +/* + * We don't have PCI yet. + * _IO_BASE is pointing at what should be unused virtual space. + */ +#define IO_SPACE_LIMIT 0xffff +#define _IO_BASE ((void __iomem *)0xfe000000) + +#define IOMEM(x) ((void __force __iomem *)(x)) + +extern int remap_area_pages(unsigned long start, unsigned long phys_addr, + unsigned long end, unsigned long flags); + +/* Defined in lib/io.c, needed for smc91x driver. */ +extern void __raw_readsw(const void __iomem *addr, void *data, int wordlen); +extern void __raw_writesw(void __iomem *addr, const void *data, int wordlen); + +extern void __raw_readsl(const void __iomem *addr, void *data, int wordlen); +extern void __raw_writesl(void __iomem *addr, const void *data, int wordlen); + +#define readsw(p, d, l) __raw_readsw(p, d, l) +#define writesw(p, d, l) __raw_writesw(p, d, l) + +#define readsl(p, d, l) __raw_readsl(p, d, l) +#define writesl(p, d, l) __raw_writesl(p, d, l) + +/* + * virt_to_phys - map virtual address to physical + * @address: address to map + */ +static inline unsigned long virt_to_phys(volatile void *address) +{ + return __pa(address); +} + +/* + * phys_to_virt - map physical address to virtual + * @address: address to map + */ +static inline void *phys_to_virt(unsigned long address) +{ + return __va(address); +} + +/* + * convert a physical pointer to a virtual kernel pointer for + * /dev/mem access. + */ +#define xlate_dev_mem_ptr(p) __va(p) + +/* + * IO port access primitives. Hexagon doesn't have special IO access + * instructions; all I/O is memory mapped. + * + * in/out are used for "ports", but we don't have "port instructions", + * so these are really just memory mapped too. + */ + +/* + * readb - read byte from memory mapped device + * @addr: pointer to memory + * + * Operates on "I/O bus memory space" + */ +static inline u8 readb(const volatile void __iomem *addr) +{ + u8 val; + asm volatile( + "%0 = memb(%1);" + : "=&r" (val) + : "r" (addr) + ); + return val; +} + +static inline u16 readw(const volatile void __iomem *addr) +{ + u16 val; + asm volatile( + "%0 = memh(%1);" + : "=&r" (val) + : "r" (addr) + ); + return val; +} + +static inline u32 readl(const volatile void __iomem *addr) +{ + u32 val; + asm volatile( + "%0 = memw(%1);" + : "=&r" (val) + : "r" (addr) + ); + return val; +} + +/* + * writeb - write a byte to a memory location + * @data: data to write to + * @addr: pointer to memory + * + */ +static inline void writeb(u8 data, volatile void __iomem *addr) +{ + asm volatile( + "memb(%0) = %1;" + : + : "r" (addr), "r" (data) + : "memory" + ); +} + +static inline void writew(u16 data, volatile void __iomem *addr) +{ + asm volatile( + "memh(%0) = %1;" + : + : "r" (addr), "r" (data) + : "memory" + ); + +} + +static inline void writel(u32 data, volatile void __iomem *addr) +{ + asm volatile( + "memw(%0) = %1;" + : + : "r" (addr), "r" (data) + : "memory" + ); +} + +#define __raw_writeb writeb +#define __raw_writew writew +#define __raw_writel writel + +#define __raw_readb readb +#define __raw_readw readw +#define __raw_readl readl + +/* + * http://comments.gmane.org/gmane.linux.ports.arm.kernel/117626 + */ + +#define readb_relaxed __raw_readb +#define readw_relaxed __raw_readw +#define readl_relaxed __raw_readl + +#define writeb_relaxed __raw_writeb +#define writew_relaxed __raw_writew +#define writel_relaxed __raw_writel + +/* + * I/O memory mapping functions. + */ +#define _PAGE_IOREMAP (_PAGE_PRESENT | _PAGE_READ | _PAGE_WRITE | \ + (__HEXAGON_C_DEV << 6)) + +#define ioremap_uc(addr, size) ioremap((addr), (size)) + + +#define __raw_writel writel + +static inline void memcpy_fromio(void *dst, const volatile void __iomem *src, + int count) +{ + memcpy(dst, (void *) src, count); +} + +static inline void memcpy_toio(volatile void __iomem *dst, const void *src, + int count) +{ + memcpy((void *) dst, src, count); +} + +static inline void memset_io(volatile void __iomem *addr, int value, + size_t size) +{ + memset((void __force *)addr, value, size); +} + +#define PCI_IO_ADDR (volatile void __iomem *) + +/* + * inb - read byte from I/O port or something + * @port: address in I/O space + * + * Operates on "I/O bus I/O space" + */ +static inline u8 inb(unsigned long port) +{ + return readb(_IO_BASE + (port & IO_SPACE_LIMIT)); +} + +static inline u16 inw(unsigned long port) +{ + return readw(_IO_BASE + (port & IO_SPACE_LIMIT)); +} + +static inline u32 inl(unsigned long port) +{ + return readl(_IO_BASE + (port & IO_SPACE_LIMIT)); +} + +/* + * outb - write a byte to a memory location + * @data: data to write to + * @addr: address in I/O space + */ +static inline void outb(u8 data, unsigned long port) +{ + writeb(data, _IO_BASE + (port & IO_SPACE_LIMIT)); +} + +static inline void outw(u16 data, unsigned long port) +{ + writew(data, _IO_BASE + (port & IO_SPACE_LIMIT)); +} + +static inline void outl(u32 data, unsigned long port) +{ + writel(data, _IO_BASE + (port & IO_SPACE_LIMIT)); +} + +#define outb_p outb +#define outw_p outw +#define outl_p outl + +#define inb_p inb +#define inw_p inw +#define inl_p inl + +static inline void insb(unsigned long port, void *buffer, int count) +{ + if (count) { + u8 *buf = buffer; + do { + u8 x = inb(port); + *buf++ = x; + } while (--count); + } +} + +static inline void insw(unsigned long port, void *buffer, int count) +{ + if (count) { + u16 *buf = buffer; + do { + u16 x = inw(port); + *buf++ = x; + } while (--count); + } +} + +static inline void insl(unsigned long port, void *buffer, int count) +{ + if (count) { + u32 *buf = buffer; + do { + u32 x = inw(port); + *buf++ = x; + } while (--count); + } +} + +static inline void outsb(unsigned long port, const void *buffer, int count) +{ + if (count) { + const u8 *buf = buffer; + do { + outb(*buf++, port); + } while (--count); + } +} + +static inline void outsw(unsigned long port, const void *buffer, int count) +{ + if (count) { + const u16 *buf = buffer; + do { + outw(*buf++, port); + } while (--count); + } +} + +static inline void outsl(unsigned long port, const void *buffer, int count) +{ + if (count) { + const u32 *buf = buffer; + do { + outl(*buf++, port); + } while (--count); + } +} + +/* + * These defines are necessary to use the generic io.h for filling in + * the missing parts of the API contract. This is because the platform + * uses (inline) functions rather than defines and the generic helper + * fills in the undefined. + */ +#define virt_to_phys virt_to_phys +#define phys_to_virt phys_to_virt +#define memset_io memset_io +#define memcpy_fromio memcpy_fromio +#define memcpy_toio memcpy_toio +#define readb readb +#define readw readw +#define readl readl +#define writeb writeb +#define writew writew +#define writel writel +#define insb insb +#define insw insw +#define insl insl +#define outsb outsb +#define outsw outsw +#define outsl outsl +#include <asm-generic/io.h> + +#endif /* __KERNEL__ */ + +#endif |