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openrisc: map as uncached in ioremap

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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)
{