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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
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);
}
/*
* ioremap - map bus memory into CPU space
* @offset: bus address of the memory
* @size: size of the resource to map
*
* ioremap performs a platform specific sequence of operations to
* make bus memory CPU accessible via the readb/readw/readl/writeb/
* writew/writel functions and the other mmio helpers. The returned
* address is not guaranteed to be usable directly as a virtual
* address.
*/
#define ioremap(offset, size) \
ioremap_prot((offset), (size), _CACHE_SUC)
/*
* ioremap_wc - map bus memory into CPU space
* @offset: bus address of the memory
* @size: size of the resource to map
*
* ioremap_wc performs a platform specific sequence of operations to
* make bus memory CPU accessible via the readb/readw/readl/writeb/
* writew/writel functions and the other mmio helpers. The returned
* address is not guaranteed to be usable directly as a virtual
* address.
*
* This version of ioremap ensures that the memory is marked uncachable
* but accelerated by means of write-combining feature. It is specifically
* useful for PCIe prefetchable windows, which may vastly improve a
* communications performance. If it was determined on boot stage, what
* CPU CCA doesn't support WUC, the method shall fall-back to the
* _CACHE_SUC option (see cpu_probe() method).
*/
#define ioremap_wc(offset, size) \
ioremap_prot((offset), (size), _CACHE_WUC)
/*
* ioremap_cache - map bus memory into CPU space
* @offset: bus address of the memory
* @size: size of the resource to map
*
* ioremap_cache performs a platform specific sequence of operations to
* make bus memory CPU accessible via the readb/readw/readl/writeb/
* writew/writel functions and the other mmio helpers. The returned
* address is not guaranteed to be usable directly as a virtual
* address.
*
* This version of ioremap ensures that the memory is marked cachable by
* the CPU. Also enables full write-combining. Useful for some
* memory-like regions on I/O busses.
*/
#define ioremap_cache(offset, size) \
ioremap_prot((offset), (size), _CACHE_CC)
static inline void iounmap(const volatile void __iomem *addr)
{
}
#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))
#include <asm-generic/io.h>
#endif /* _ASM_IO_H */
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