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sh: make pmb iomapping configurable.

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This plugs in an early_param for permitting transparent PMB-backed
ioremapping to be enabled/disabled. For the time being, we use a
default-disabled policy.

Signed-off-by: Paul Mundt <lethal@linux-sh.org>
This commit is contained in:
Paul Mundt 2010-03-02 16:49:50 +09:00
parent 90e7d649d8
commit 4cfa8e75d6
1 changed files with 17 additions and 0 deletions
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17
arch/sh/mm/pmb.c
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@ -68,6 +68,8 @@ static DEFINE_RWLOCK(pmb_rwlock);
static struct pmb_entry pmb_entry_list[NR_PMB_ENTRIES];
static DECLARE_BITMAP(pmb_map, NR_PMB_ENTRIES);
static unsigned int pmb_iomapping_enabled;
static __always_inline unsigned long mk_pmb_entry(unsigned int entry)
{
return (entry & PMB_E_MASK) << PMB_E_SHIFT;
@ -284,6 +286,9 @@ void __iomem *pmb_remap_caller(phys_addr_t phys, unsigned long size,
unsigned long aligned;
struct vm_struct *area;
if (!pmb_iomapping_enabled)
return NULL;
/*
* Small mappings need to go through the TLB.
*/
@ -684,6 +689,18 @@ static void __init pmb_resize(void)
}
#endif
static int __init early_pmb(char *p)
{
if (!p)
return 0;
if (strstr(p, "iomap"))
pmb_iomapping_enabled = 1;
return 0;
}
early_param("pmb", early_pmb);
void __init pmb_init(void)
{
/* Synchronize software state */