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Diffstat (limited to '')
-rw-r--r-- | arch/loongarch/include/asm/io.h | 80 |
1 files changed, 80 insertions, 0 deletions
diff --git a/arch/loongarch/include/asm/io.h b/arch/loongarch/include/asm/io.h new file mode 100644 index 0000000000..c486c2341b --- /dev/null +++ b/arch/loongarch/include/asm/io.h @@ -0,0 +1,80 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +/* + * Copyright (C) 2020-2022 Loongson Technology Corporation Limited + */ +#ifndef _ASM_IO_H +#define _ASM_IO_H + +#include <linux/kernel.h> +#include <linux/types.h> + +#include <asm/addrspace.h> +#include <asm/cpu.h> +#include <asm/page.h> +#include <asm/pgtable-bits.h> +#include <asm/string.h> + +/* + * Change "struct page" to physical address. + */ +#define page_to_phys(page) ((phys_addr_t)page_to_pfn(page) << PAGE_SHIFT) + +extern void __init __iomem *early_ioremap(u64 phys_addr, unsigned long size); +extern void __init early_iounmap(void __iomem *addr, unsigned long size); + +#define early_memremap early_ioremap +#define early_memunmap early_iounmap + +#ifdef CONFIG_ARCH_IOREMAP + +static inline void __iomem *ioremap_prot(phys_addr_t offset, unsigned long size, + unsigned long prot_val) +{ + if (prot_val & _CACHE_CC) + return (void __iomem *)(unsigned long)(CACHE_BASE + offset); + else + return (void __iomem *)(unsigned long)(UNCACHE_BASE + offset); +} + +#define ioremap(offset, size) \ + ioremap_prot((offset), (size), pgprot_val(PAGE_KERNEL_SUC)) + +#define iounmap(addr) ((void)(addr)) + +#endif + +/* + * On LoongArch, ioremap() has two variants, ioremap_wc() and ioremap_cache(). + * They map bus memory into CPU space, the mapped memory is marked uncachable + * (_CACHE_SUC), uncachable but accelerated by write-combine (_CACHE_WUC) and + * cachable (_CACHE_CC) respectively for CPU access. + * + * @offset: bus address of the memory + * @size: size of the resource to map + */ +#define ioremap_wc(offset, size) \ + ioremap_prot((offset), (size), \ + pgprot_val(wc_enabled ? PAGE_KERNEL_WUC : PAGE_KERNEL_SUC)) + +#define ioremap_cache(offset, size) \ + ioremap_prot((offset), (size), pgprot_val(PAGE_KERNEL)) + +#define mmiowb() wmb() + +/* + * String version of I/O memory access operations. + */ +extern void __memset_io(volatile void __iomem *dst, int c, size_t count); +extern void __memcpy_toio(volatile void __iomem *to, const void *from, size_t count); +extern void __memcpy_fromio(void *to, const volatile void __iomem *from, size_t count); +#define memset_io(c, v, l) __memset_io((c), (v), (l)) +#define memcpy_fromio(a, c, l) __memcpy_fromio((a), (c), (l)) +#define memcpy_toio(c, a, l) __memcpy_toio((c), (a), (l)) + +#include <asm-generic/io.h> + +#define ARCH_HAS_VALID_PHYS_ADDR_RANGE +extern int valid_phys_addr_range(phys_addr_t addr, size_t size); +extern int valid_mmap_phys_addr_range(unsigned long pfn, size_t size); + +#endif /* _ASM_IO_H */ |