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| author |   Paul Mundt <lethal@linux-sh.org> | 2010-03-02 16:49:50 +0900 |
|---|---|---|
| committer | Paul Mundt <lethal@linux-sh.org> | 2010-03-02 16:49:50 +0900 |
| commit | 4cfa8e75d6854699597e21fd570721d63f899934 (patch) | |
| tree | cb9199101ee22020524b6e96bfed4caa4ba12e7e /arch/sh/mm/pmb.c | |
| parent | sh: reworked dynamic PMB mapping. (diff) | |
| download | linux-dev-4cfa8e75d6854699597e21fd570721d63f899934.tar.xz linux-dev-4cfa8e75d6854699597e21fd570721d63f899934.zip | |
sh: make pmb iomapping configurable.
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>
Diffstat (limited to 'arch/sh/mm/pmb.c')
| -rw-r--r-- | arch/sh/mm/pmb.c | 17 |
1 files changed, 17 insertions, 0 deletions
diff --git a/arch/sh/mm/pmb.c b/arch/sh/mm/pmb.c index 9a516b89839a..9429355c18ca 100644 --- a/arch/sh/mm/pmb.c +++ b/arch/sh/mm/pmb.c @@ -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 */ |