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/* SPDX-License-Identifier: GPL-2.0 */
/*
* Copyright (C) 2020-2022 Loongson Technology Corporation Limited
*/
#ifndef _ASM_IO_H
#define _ASM_IO_H
#define ARCH_HAS_IOREMAP_WC
#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(PAGE_KERNEL_WUC))
#define ioremap_cache(offset, size) \
ioremap_prot((offset), (size), pgprot_val(PAGE_KERNEL))
#define mmiowb() asm volatile ("dbar 0" ::: "memory")
/*
* 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))
#define __io_aw() mmiowb()
#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 */
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