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openrisc: map as uncached in ioremap 

Openrisc is the only architecture not mapping ioremap as uncached,
which has been the default since the Linux 2.6.x days.  Switch it
over to implement uncached semantics by default.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Stafford Horne <shorne@gmail.com>
This commit is contained in:
Christoph Hellwig 2019-08-17 09:32:32 +02:00 committed by Stafford Horne
parent eabe7e9a21
commit f3b17320db
3 changed files with 8 additions and 22 deletions
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20
arch/openrisc/include/asm/io.h
View File

@ -25,25 +25,11 @@
#define PIO_OFFSET 0
#define PIO_MASK 0
#define ioremap_nocache ioremap_nocache
#define ioremap_nocache ioremap
#include <asm-generic/io.h>
#include <asm/pgtable.h>
extern void __iomem *__ioremap(phys_addr_t offset, unsigned long size,
pgprot_t prot);
static inline void __iomem *ioremap(phys_addr_t offset, size_t size)
{
return __ioremap(offset, size, PAGE_KERNEL);
}
/* #define _PAGE_CI 0x002 */
static inline void __iomem *ioremap_nocache(phys_addr_t offset,
unsigned long size)
{
return __ioremap(offset, size,
__pgprot(pgprot_val(PAGE_KERNEL) | _PAGE_CI));
}
void __iomem *ioremap(phys_addr_t offset, unsigned long size);
extern void iounmap(void *addr);
#endif

2
arch/openrisc/include/asm/pgtable.h
View File

@ -97,7 +97,7 @@ extern void paging_init(void);
/* Define some higher level generic page attributes.
*
* If you change _PAGE_CI definition be sure to change it in
* io.h for ioremap_nocache() too.
* io.h for ioremap() too.
*/
/*

8
arch/openrisc/mm/ioremap.c
View File

@ -34,8 +34,7 @@ static unsigned int fixmaps_used __initdata;
* have to convert them into an offset in a page-aligned mapping, but the
* caller shouldn't need to know that small detail.
*/
void __iomem *__ref
__ioremap(phys_addr_t addr, unsigned long size, pgprot_t prot)
void __iomem *__ref ioremap(phys_addr_t addr, unsigned long size)
{
phys_addr_t p;
unsigned long v;
@ -66,7 +65,8 @@ __ioremap(phys_addr_t addr, unsigned long size, pgprot_t prot)
fixmaps_used += (size >> PAGE_SHIFT);
}
if (ioremap_page_range(v, v + size, p, prot)) {
if (ioremap_page_range(v, v + size, p,
__pgprot(pgprot_val(PAGE_KERNEL) | _PAGE_CI))) {
if (likely(mem_init_done))
vfree(area->addr);
else
@ -76,7 +76,7 @@ __ioremap(phys_addr_t addr, unsigned long size, pgprot_t prot)
return (void __iomem *)(offset + (char *)v);
}
EXPORT_SYMBOL(__ioremap);
EXPORT_SYMBOL(ioremap);
void iounmap(void *addr)
{