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iommu/arm-smmu: use relaxed accessors where possible 

Apart from fault handling and page table manipulation, we don't care
about memory ordering between SMMU control registers and normal,
cacheable memory, so use the _relaxed I/O accessors wherever possible.

Signed-off-by: Will Deacon <will.deacon@arm.com>
This commit is contained in:
Will Deacon 2013-08-21 13:49:53 +01:00
parent 8a7f431221
commit 25724841df
1 changed files with 3 additions and 3 deletions
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6
drivers/iommu/arm-smmu.c
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@ -778,7 +778,7 @@ static void arm_smmu_init_context_bank(struct arm_smmu_domain *smmu_domain)
#ifdef __BIG_ENDIAN #ifdef __BIG_ENDIAN
reg |= SCTLR_E; reg |= SCTLR_E;
#endif #endif
writel(reg, cb_base + ARM_SMMU_CB_SCTLR); writel_relaxed(reg, cb_base + ARM_SMMU_CB_SCTLR);
} }
static int arm_smmu_init_domain_context(struct iommu_domain *domain, static int arm_smmu_init_domain_context(struct iommu_domain *domain,
@ -1595,7 +1595,7 @@ static void arm_smmu_device_reset(struct arm_smmu_device *smmu)
/* Push the button */ /* Push the button */
arm_smmu_tlb_sync(smmu); arm_smmu_tlb_sync(smmu);
writel(scr0, gr0_base + ARM_SMMU_GR0_sCR0); writel_relaxed(scr0, gr0_base + ARM_SMMU_GR0_sCR0);
} }
static int arm_smmu_id_size_to_bits(int size) static int arm_smmu_id_size_to_bits(int size)
@ -1928,7 +1928,7 @@ static int arm_smmu_device_remove(struct platform_device *pdev)
free_irq(smmu->irqs[i], smmu); free_irq(smmu->irqs[i], smmu);
/* Turn the thing off */ /* Turn the thing off */
writel(sCR0_CLIENTPD, ARM_SMMU_GR0(smmu) + ARM_SMMU_GR0_sCR0); writel_relaxed(sCR0_CLIENTPD, ARM_SMMU_GR0(smmu) + ARM_SMMU_GR0_sCR0);
return 0; return 0;
} }