134 lines
2.5 KiB
C
134 lines
2.5 KiB
C
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/* SPDX-License-Identifier: GPL-2.0-only */
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/*
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* IO definitions for the Hexagon architecture
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*
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* Copyright (c) 2010-2013, The Linux Foundation. All rights reserved.
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*/
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#ifndef _ASM_IO_H
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#define _ASM_IO_H
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#include <linux/types.h>
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#include <asm/page.h>
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#include <asm/cacheflush.h>
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extern int remap_area_pages(unsigned long start, unsigned long phys_addr,
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unsigned long end, unsigned long flags);
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/*
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* virt_to_phys - map virtual address to physical
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* @address: address to map
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*/
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static inline unsigned long virt_to_phys(volatile void *address)
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{
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return __pa(address);
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}
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/*
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* phys_to_virt - map physical address to virtual
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* @address: address to map
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*/
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static inline void *phys_to_virt(unsigned long address)
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{
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return __va(address);
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}
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/*
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* readb - read byte from memory mapped device
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* @addr: pointer to memory
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*
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*/
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static inline u8 __raw_readb(const volatile void __iomem *addr)
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{
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u8 val;
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asm volatile(
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"%0 = memb(%1);"
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: "=&r" (val)
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: "r" (addr)
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);
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return val;
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}
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#define __raw_readb __raw_readb
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static inline u16 __raw_readw(const volatile void __iomem *addr)
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{
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u16 val;
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asm volatile(
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"%0 = memh(%1);"
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: "=&r" (val)
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: "r" (addr)
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);
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return val;
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}
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#define __raw_readw __raw_readw
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static inline u32 __raw_readl(const volatile void __iomem *addr)
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{
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u32 val;
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asm volatile(
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"%0 = memw(%1);"
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: "=&r" (val)
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: "r" (addr)
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);
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return val;
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}
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#define __raw_readl __raw_readl
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/*
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* writeb - write a byte to a memory location
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* @data: data to write to
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* @addr: pointer to memory
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*
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*/
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static inline void __raw_writeb(u8 data, volatile void __iomem *addr)
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{
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asm volatile(
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"memb(%0) = %1;"
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:
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: "r" (addr), "r" (data)
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: "memory"
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);
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}
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#define __raw_writeb __raw_writeb
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static inline void __raw_writew(u16 data, volatile void __iomem *addr)
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{
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asm volatile(
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"memh(%0) = %1;"
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:
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: "r" (addr), "r" (data)
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: "memory"
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);
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}
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#define __raw_writew __raw_writew
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static inline void __raw_writel(u32 data, volatile void __iomem *addr)
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{
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asm volatile(
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"memw(%0) = %1;"
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:
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: "r" (addr), "r" (data)
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: "memory"
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);
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}
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#define __raw_writel __raw_writel
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/*
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* I/O memory mapping functions.
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*/
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#define _PAGE_IOREMAP (_PAGE_PRESENT | _PAGE_READ | _PAGE_WRITE | \
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(__HEXAGON_C_DEV << 6))
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/*
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* These defines are necessary to use the generic io.h for filling in
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* the missing parts of the API contract. This is because the platform
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* uses (inline) functions rather than defines and the generic helper
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* fills in the undefined.
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*/
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#define virt_to_phys virt_to_phys
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#define phys_to_virt phys_to_virt
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#include <asm-generic/io.h>
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#endif
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