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| author | David Cohen <dacohen@gmail.com> | 2011-02-16 19:35:51 +0000 |
|---|---|---|
| committer | Tony Lindgren <tony@atomide.com> | 2011-02-24 14:23:17 -0800 |
| commit | d594f1f31afe13edd8c02f3854a65cc58cfb3b74 (patch) | |
| tree | 8986a9af7302b214316f9498d153be46c9c4df38 /arch/arm/mach-omap2/iommu2.c | |
| parent | 92e753d7984db36f0a3c0bbf0f377da114768775 (diff) | |
| download | kernel_samsung_smdk4412-d594f1f31afe13edd8c02f3854a65cc58cfb3b74.zip kernel_samsung_smdk4412-d594f1f31afe13edd8c02f3854a65cc58cfb3b74.tar.gz kernel_samsung_smdk4412-d594f1f31afe13edd8c02f3854a65cc58cfb3b74.tar.bz2 | |
omap: IOMMU: add support to callback during fault handling
Add support to register an isr for IOMMU fault situations and adapt it
to allow such (*isr)() to be used as fault callback. Drivers using IOMMU
module might want to be informed when errors happen in order to debug it
or react.
Signed-off-by: David Cohen <dacohen@gmail.com>
Acked-by: Hiroshi DOYU <Hiroshi.DOYU@nokia.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>
Diffstat (limited to 'arch/arm/mach-omap2/iommu2.c')
| -rw-r--r-- | arch/arm/mach-omap2/iommu2.c | 17 |
1 files changed, 15 insertions, 2 deletions
diff --git a/arch/arm/mach-omap2/iommu2.c b/arch/arm/mach-omap2/iommu2.c index 49a1e5e..adb083e 100644 --- a/arch/arm/mach-omap2/iommu2.c +++ b/arch/arm/mach-omap2/iommu2.c @@ -146,18 +146,31 @@ static void omap2_iommu_set_twl(struct iommu *obj, bool on) static u32 omap2_iommu_fault_isr(struct iommu *obj, u32 *ra) { u32 stat, da; + u32 errs = 0; stat = iommu_read_reg(obj, MMU_IRQSTATUS); stat &= MMU_IRQ_MASK; - if (!stat) + if (!stat) { + *ra = 0; return 0; + } da = iommu_read_reg(obj, MMU_FAULT_AD); *ra = da; + if (stat & MMU_IRQ_TLBMISS) + errs |= OMAP_IOMMU_ERR_TLB_MISS; + if (stat & MMU_IRQ_TRANSLATIONFAULT) + errs |= OMAP_IOMMU_ERR_TRANS_FAULT; + if (stat & MMU_IRQ_EMUMISS) + errs |= OMAP_IOMMU_ERR_EMU_MISS; + if (stat & MMU_IRQ_TABLEWALKFAULT) + errs |= OMAP_IOMMU_ERR_TBLWALK_FAULT; + if (stat & MMU_IRQ_MULTIHITFAULT) + errs |= OMAP_IOMMU_ERR_MULTIHIT_FAULT; iommu_write_reg(obj, stat, MMU_IRQSTATUS); - return stat; + return errs; } static void omap2_tlb_read_cr(struct iommu *obj, struct cr_regs *cr) |