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Diffstat (limited to 'arch/arm/mach-omap2/iommu2.c')
-rw-r--r--arch/arm/mach-omap2/iommu2.c44
1 files changed, 35 insertions, 9 deletions
diff --git a/arch/arm/mach-omap2/iommu2.c b/arch/arm/mach-omap2/iommu2.c
index e82da680d90..14ee686b649 100644
--- a/arch/arm/mach-omap2/iommu2.c
+++ b/arch/arm/mach-omap2/iommu2.c
@@ -44,9 +44,13 @@
#define MMU_IRQ_EMUMISS (1 << 2)
#define MMU_IRQ_TRANSLATIONFAULT (1 << 1)
#define MMU_IRQ_TLBMISS (1 << 0)
-#define MMU_IRQ_MASK \
- (MMU_IRQ_MULTIHITFAULT | MMU_IRQ_TABLEWALKFAULT | MMU_IRQ_EMUMISS | \
- MMU_IRQ_TRANSLATIONFAULT)
+
+#define __MMU_IRQ_FAULT \
+ (MMU_IRQ_MULTIHITFAULT | MMU_IRQ_EMUMISS | MMU_IRQ_TRANSLATIONFAULT)
+#define MMU_IRQ_MASK \
+ (__MMU_IRQ_FAULT | MMU_IRQ_TABLEWALKFAULT | MMU_IRQ_TLBMISS)
+#define MMU_IRQ_TWL_MASK (__MMU_IRQ_FAULT | MMU_IRQ_TABLEWALKFAULT)
+#define MMU_IRQ_TLB_MISS_MASK (__MMU_IRQ_FAULT | MMU_IRQ_TLBMISS)
/* MMU_CNTL */
#define MMU_CNTL_SHIFT 1
@@ -61,6 +65,26 @@
((pgsz) == MMU_CAM_PGSZ_64K) ? 0xffff0000 : \
((pgsz) == MMU_CAM_PGSZ_4K) ? 0xfffff000 : 0)
+
+static void __iommu_set_twl(struct iommu *obj, bool on)
+{
+ u32 l = iommu_read_reg(obj, MMU_CNTL);
+
+ if (on)
+ iommu_write_reg(obj, MMU_IRQ_TWL_MASK, MMU_IRQENABLE);
+ else
+ iommu_write_reg(obj, MMU_IRQ_TLB_MISS_MASK, MMU_IRQENABLE);
+
+ l &= ~MMU_CNTL_MASK;
+ if (on)
+ l |= (MMU_CNTL_MMU_EN | MMU_CNTL_TWL_EN);
+ else
+ l |= (MMU_CNTL_MMU_EN);
+
+ iommu_write_reg(obj, l, MMU_CNTL);
+}
+
+
static int omap2_iommu_enable(struct iommu *obj)
{
u32 l, pa;
@@ -96,13 +120,9 @@ static int omap2_iommu_enable(struct iommu *obj)
l |= (MMU_SYS_IDLE_SMART | MMU_SYS_AUTOIDLE);
iommu_write_reg(obj, l, MMU_SYSCONFIG);
- iommu_write_reg(obj, MMU_IRQ_MASK, MMU_IRQENABLE);
iommu_write_reg(obj, pa, MMU_TTB);
- l = iommu_read_reg(obj, MMU_CNTL);
- l &= ~MMU_CNTL_MASK;
- l |= (MMU_CNTL_MMU_EN | MMU_CNTL_TWL_EN);
- iommu_write_reg(obj, l, MMU_CNTL);
+ __iommu_set_twl(obj, true);
return 0;
}
@@ -118,6 +138,11 @@ static void omap2_iommu_disable(struct iommu *obj)
dev_dbg(obj->dev, "%s is shutting down\n", obj->name);
}
+static void omap2_iommu_set_twl(struct iommu *obj, bool on)
+{
+ __iommu_set_twl(obj, false);
+}
+
static u32 omap2_iommu_fault_isr(struct iommu *obj, u32 *ra)
{
int i;
@@ -147,7 +172,7 @@ static u32 omap2_iommu_fault_isr(struct iommu *obj, u32 *ra)
printk("\n");
iommu_write_reg(obj, stat, MMU_IRQSTATUS);
- omap2_iommu_disable(obj);
+
return stat;
}
@@ -300,6 +325,7 @@ static const struct iommu_functions omap2_iommu_ops = {
.enable = omap2_iommu_enable,
.disable = omap2_iommu_disable,
+ .set_twl = omap2_iommu_set_twl,
.fault_isr = omap2_iommu_fault_isr,
.tlb_read_cr = omap2_tlb_read_cr,