提交 4a64f68d 编写于 作者: G Greentime Hu

nds32: Device specific operations

This patch introduces ioremap implementations.
Signed-off-by: NVincent Chen <vincentc@andestech.com>
Signed-off-by: NGreentime Hu <greentime@andestech.com>
Acked-by: NArnd Bergmann <arnd@arndb.de>
上级 484367b6
// SPDX-License-Identifier: GPL-2.0
// Copyright (C) 2005-2017 Andes Technology Corporation
#ifndef __ASM_NDS32_IO_H
#define __ASM_NDS32_IO_H
extern void iounmap(volatile void __iomem *addr);
#define __raw_writeb __raw_writeb
static inline void __raw_writeb(u8 val, volatile void __iomem *addr)
{
asm volatile("sbi %0, [%1]" : : "r" (val), "r" (addr));
}
#define __raw_writew __raw_writew
static inline void __raw_writew(u16 val, volatile void __iomem *addr)
{
asm volatile("shi %0, [%1]" : : "r" (val), "r" (addr));
}
#define __raw_writel __raw_writel
static inline void __raw_writel(u32 val, volatile void __iomem *addr)
{
asm volatile("swi %0, [%1]" : : "r" (val), "r" (addr));
}
#define __raw_readb __raw_readb
static inline u8 __raw_readb(const volatile void __iomem *addr)
{
u8 val;
asm volatile("lbi %0, [%1]" : "=r" (val) : "r" (addr));
return val;
}
#define __raw_readw __raw_readw
static inline u16 __raw_readw(const volatile void __iomem *addr)
{
u16 val;
asm volatile("lhi %0, [%1]" : "=r" (val) : "r" (addr));
return val;
}
#define __raw_readl __raw_readl
static inline u32 __raw_readl(const volatile void __iomem *addr)
{
u32 val;
asm volatile("lwi %0, [%1]" : "=r" (val) : "r" (addr));
return val;
}
#define __iormb() rmb()
#define __iowmb() wmb()
#define mmiowb() __asm__ __volatile__ ("msync all" : : : "memory");
/*
* {read,write}{b,w,l,q}_relaxed() are like the regular version, but
* are not guaranteed to provide ordering against spinlocks or memory
* accesses.
*/
#define readb_relaxed(c) ({ u8 __v = __raw_readb(c); __v; })
#define readw_relaxed(c) ({ u16 __v = le16_to_cpu((__force __le16)__raw_readw(c)); __v; })
#define readl_relaxed(c) ({ u32 __v = le32_to_cpu((__force __le32)__raw_readl(c)); __v; })
#define writeb_relaxed(v,c) ((void)__raw_writeb((v),(c)))
#define writew_relaxed(v,c) ((void)__raw_writew((__force u16)cpu_to_le16(v),(c)))
#define writel_relaxed(v,c) ((void)__raw_writel((__force u32)cpu_to_le32(v),(c)))
/*
* {read,write}{b,w,l,q}() access little endian memory and return result in
* native endianness.
*/
#define readb(c) ({ u8 __v = readb_relaxed(c); __iormb(); __v; })
#define readw(c) ({ u16 __v = readw_relaxed(c); __iormb(); __v; })
#define readl(c) ({ u32 __v = readl_relaxed(c); __iormb(); __v; })
#define writeb(v,c) ({ __iowmb(); writeb_relaxed((v),(c)); })
#define writew(v,c) ({ __iowmb(); writew_relaxed((v),(c)); })
#define writel(v,c) ({ __iowmb(); writel_relaxed((v),(c)); })
#include <asm-generic/io.h>
#endif /* __ASM_NDS32_IO_H */
// SPDX-License-Identifier: GPL-2.0
// Copyright (C) 2005-2017 Andes Technology Corporation
#include <linux/vmalloc.h>
#include <linux/io.h>
#include <linux/mm.h>
#include <asm/pgtable.h>
void __iomem *ioremap(phys_addr_t phys_addr, size_t size);
static void __iomem *__ioremap_caller(phys_addr_t phys_addr, size_t size,
void *caller)
{
struct vm_struct *area;
unsigned long addr, offset, last_addr;
pgprot_t prot;
/* Don't allow wraparound or zero size */
last_addr = phys_addr + size - 1;
if (!size || last_addr < phys_addr)
return NULL;
/*
* Mappings have to be page-aligned
*/
offset = phys_addr & ~PAGE_MASK;
phys_addr &= PAGE_MASK;
size = PAGE_ALIGN(last_addr + 1) - phys_addr;
/*
* Ok, go for it..
*/
area = get_vm_area_caller(size, VM_IOREMAP, caller);
if (!area)
return NULL;
area->phys_addr = phys_addr;
addr = (unsigned long)area->addr;
prot = __pgprot(_PAGE_V | _PAGE_M_KRW | _PAGE_D |
_PAGE_G | _PAGE_C_DEV);
if (ioremap_page_range(addr, addr + size, phys_addr, prot)) {
vunmap((void *)addr);
return NULL;
}
return (__force void __iomem *)(offset + (char *)addr);
}
void __iomem *ioremap(phys_addr_t phys_addr, size_t size)
{
return __ioremap_caller(phys_addr, size,
__builtin_return_address(0));
}
EXPORT_SYMBOL(ioremap);
void iounmap(volatile void __iomem * addr)
{
vunmap((void *)(PAGE_MASK & (unsigned long)addr));
}
EXPORT_SYMBOL(iounmap);
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