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iommu/arm-smmu: Clear global and context bank fault status registers 

After reset these registers have unknown values.
This might cause problems when evaluating SMMU_GFSR and/or SMMU_CB_FSR
in handlers for combined interrupts.

Signed-off-by: Andreas Herrmann <andreas.herrmann@calxeda.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
This commit is contained in:
Andreas Herrmann 2013-10-01 13:39:09 +01:00 committed by Will Deacon
parent 2ef0f03120
commit 659db6f6be
1 changed files with 20 additions and 11 deletions
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31
drivers/iommu/arm-smmu.c
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@ -1562,9 +1562,13 @@ static struct iommu_ops arm_smmu_ops = {
static void arm_smmu_device_reset(struct arm_smmu_device *smmu)
{
void __iomem *gr0_base = ARM_SMMU_GR0(smmu);
void __iomem *sctlr_base = ARM_SMMU_CB_BASE(smmu) + ARM_SMMU_CB_SCTLR;
void __iomem *cb_base;
int i = 0;
u32 scr0 = readl_relaxed(gr0_base + ARM_SMMU_GR0_sCR0);
u32 reg;
/* Clear Global FSR */
reg = readl_relaxed(gr0_base + ARM_SMMU_GR0_sGFSR);
writel(reg, gr0_base + ARM_SMMU_GR0_sGFSR);
/* Mark all SMRn as invalid and all S2CRn as bypass */
for (i = 0; i < smmu->num_mapping_groups; ++i) {
@ -1572,33 +1576,38 @@ static void arm_smmu_device_reset(struct arm_smmu_device *smmu)
writel_relaxed(S2CR_TYPE_BYPASS, gr0_base + ARM_SMMU_GR0_S2CR(i));
}
/* Make sure all context banks are disabled */
for (i = 0; i < smmu->num_context_banks; ++i)
writel_relaxed(0, sctlr_base + ARM_SMMU_CB(smmu, i));
/* Make sure all context banks are disabled and clear CB_FSR */
for (i = 0; i < smmu->num_context_banks; ++i) {
cb_base = ARM_SMMU_CB_BASE(smmu) + ARM_SMMU_CB(smmu, i);
writel_relaxed(0, cb_base + ARM_SMMU_CB_SCTLR);
writel_relaxed(FSR_FAULT, cb_base + ARM_SMMU_CB_FSR);
}
/* Invalidate the TLB, just in case */
writel_relaxed(0, gr0_base + ARM_SMMU_GR0_STLBIALL);
writel_relaxed(0, gr0_base + ARM_SMMU_GR0_TLBIALLH);
writel_relaxed(0, gr0_base + ARM_SMMU_GR0_TLBIALLNSNH);
reg = readl_relaxed(gr0_base + ARM_SMMU_GR0_sCR0);
/* Enable fault reporting */
scr0 |= (sCR0_GFRE | sCR0_GFIE | sCR0_GCFGFRE | sCR0_GCFGFIE);
reg |= (sCR0_GFRE | sCR0_GFIE | sCR0_GCFGFRE | sCR0_GCFGFIE);
/* Disable TLB broadcasting. */
scr0 |= (sCR0_VMIDPNE | sCR0_PTM);
reg |= (sCR0_VMIDPNE | sCR0_PTM);
/* Enable client access, but bypass when no mapping is found */
scr0 &= ~(sCR0_CLIENTPD | sCR0_USFCFG);
reg &= ~(sCR0_CLIENTPD | sCR0_USFCFG);
/* Disable forced broadcasting */
scr0 &= ~sCR0_FB;
reg &= ~sCR0_FB;
/* Don't upgrade barriers */
scr0 &= ~(sCR0_BSU_MASK << sCR0_BSU_SHIFT);
reg &= ~(sCR0_BSU_MASK << sCR0_BSU_SHIFT);
/* Push the button */
arm_smmu_tlb_sync(smmu);
writel_relaxed(scr0, gr0_base + ARM_SMMU_GR0_sCR0);
writel_relaxed(reg, gr0_base + ARM_SMMU_GR0_sCR0);
}
static int arm_smmu_id_size_to_bits(int size)