From ddfa975a8cf66753a7d829bada753c3617628486 Mon Sep 17 00:00:00 2001 From: "Kanigeri, Hari" Date: Mon, 24 May 2010 02:01:51 +0000 Subject: omap iommu: add functionality to get TLB miss interrupt In order to enable TLB miss interrupt, the TWL should be disabled. This patch provides the functionality to get the MMU fault interrupt for a TLB miss in the cases where the users are working with the locked TLB entries and with TWL disabled. New interface is added to select twl and to enable TLB miss interrupt. Signed-off-by: Hari Kanigeri Signed-off-by: Ramesh Gupta Signed-off-by: Hiroshi Doyu --- arch/arm/plat-omap/iommu.c | 17 +++++++++++++++++ 1 file changed, 17 insertions(+) (limited to 'arch/arm/plat-omap/iommu.c') diff --git a/arch/arm/plat-omap/iommu.c b/arch/arm/plat-omap/iommu.c index 341c48179ee..688ae66bb8f 100644 --- a/arch/arm/plat-omap/iommu.c +++ b/arch/arm/plat-omap/iommu.c @@ -370,6 +370,23 @@ void flush_iotlb_all(struct iommu *obj) } EXPORT_SYMBOL_GPL(flush_iotlb_all); +/** + * iommu_set_twl - enable/disable table walking logic + * @obj: target iommu + * @on: enable/disable + * + * Function used to enable/disable TWL. If one wants to work + * exclusively with locked TLB entries and receive notifications + * for TLB miss then call this function to disable TWL. + */ +void iommu_set_twl(struct iommu *obj, bool on) +{ + clk_enable(obj->clk); + arch_iommu->set_twl(obj, on); + clk_disable(obj->clk); +} +EXPORT_SYMBOL_GPL(iommu_set_twl); + #if defined(CONFIG_OMAP_IOMMU_DEBUG_MODULE) ssize_t iommu_dump_ctx(struct iommu *obj, char *buf, ssize_t bytes) -- cgit v1.2.3