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csky: Fixup ioremap function losing

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Implement the following apis to meet usage in different scenarios.

 - ioremap          (NonCache + StrongOrder)
 - ioremap_nocache  (NonCache + StrongOrder)
 - ioremap_wc       (NonCache + WeakOrder  )
 - ioremap_cache    (   Cache + WeakOrder  )

Also change flag VM_ALLOC to VM_IOREMAP in get_vm_area_caller.

Signed-off-by: Guo Ren <ren_guo@c-sky.com>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: Christoph Hellwig <hch@infradead.org>
This commit is contained in:
Guo Ren 2019-08-15 16:24:56 +08:00
parent ae76f635d4
commit 5336c17928
2 changed files with 29 additions and 17 deletions
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23
arch/csky/include/asm/io.h
View File

@ -4,17 +4,10 @@
#ifndef __ASM_CSKY_IO_H
#define __ASM_CSKY_IO_H
#include <abi/pgtable-bits.h>
#include <asm/pgtable.h>
#include <linux/types.h>
#include <linux/version.h>
extern void __iomem *ioremap(phys_addr_t offset, size_t size);
extern void iounmap(void *addr);
extern int remap_area_pages(unsigned long address, phys_addr_t phys_addr,
size_t size, unsigned long flags);
/*
* I/O memory access primitives. Reads are ordered relative to any
* following Normal memory access. Writes are ordered relative to any prior
@ -40,9 +33,17 @@ extern int remap_area_pages(unsigned long address, phys_addr_t phys_addr,
#define writel(v,c) ({ wmb(); writel_relaxed((v),(c)); mb(); })
#endif
#define ioremap_nocache(phy, sz) ioremap(phy, sz)
#define ioremap_wc ioremap_nocache
#define ioremap_wt ioremap_nocache
/*
* I/O memory mapping functions.
*/
extern void __iomem *ioremap_cache(phys_addr_t addr, size_t size);
extern void __iomem *__ioremap(phys_addr_t addr, size_t size, pgprot_t prot);
extern void iounmap(void *addr);
#define ioremap(addr, size) __ioremap((addr), (size), pgprot_noncached(PAGE_KERNEL))
#define ioremap_wc(addr, size) __ioremap((addr), (size), pgprot_writecombine(PAGE_KERNEL))
#define ioremap_nocache(addr, size) ioremap((addr), (size))
#define ioremap_cache ioremap_cache
#include <asm-generic/io.h>

23
arch/csky/mm/ioremap.c
View File

@ -8,12 +8,12 @@
#include <asm/pgtable.h>
void __iomem *ioremap(phys_addr_t addr, size_t size)
static void __iomem *__ioremap_caller(phys_addr_t addr, size_t size,
pgprot_t prot, void *caller)
{
phys_addr_t last_addr;
unsigned long offset, vaddr;
struct vm_struct *area;
pgprot_t prot;
last_addr = addr + size - 1;
if (!size || last_addr < addr)
@ -23,14 +23,12 @@ void __iomem *ioremap(phys_addr_t addr, size_t size)
addr &= PAGE_MASK;
size = PAGE_ALIGN(size + offset);
area = get_vm_area_caller(size, VM_ALLOC, __builtin_return_address(0));
area = get_vm_area_caller(size, VM_IOREMAP, caller);
if (!area)
return NULL;
vaddr = (unsigned long)area->addr;
prot = pgprot_noncached(PAGE_KERNEL);
if (ioremap_page_range(vaddr, vaddr + size, addr, prot)) {
free_vm_area(area);
return NULL;
@ -38,7 +36,20 @@ void __iomem *ioremap(phys_addr_t addr, size_t size)
return (void __iomem *)(vaddr + offset);
}
EXPORT_SYMBOL(ioremap);
void __iomem *__ioremap(phys_addr_t phys_addr, size_t size, pgprot_t prot)
{
return __ioremap_caller(phys_addr, size, prot,
__builtin_return_address(0));
}
EXPORT_SYMBOL(__ioremap);
void __iomem *ioremap_cache(phys_addr_t phys_addr, size_t size)
{
return __ioremap_caller(phys_addr, size, PAGE_KERNEL,
__builtin_return_address(0));
}
EXPORT_SYMBOL(ioremap_cache);
void iounmap(void __iomem *addr)
{