iommu/tegra-smmu: Split smmu_flush_ptc()

smmu_flush_ptc() is used in two modes: one is to flush an individual
entry, the other is to flush all entries.  We know at the call site
which we require.  Split the function into smmu_flush_ptc_all() and
smmu_flush_ptc().
Signed-off-by: NRussell King <rmk+kernel@arm.linux.org.uk>
Signed-off-by: NThierry Reding <treding@nvidia.com>

drivers/iommu/tegra-smmu.c

@@ -165,13 +165,17 @@ static void smmu_flush_dcache(struct page *page, unsigned long offset,
 #endif
 }
 
+static void smmu_flush_ptc_all(struct tegra_smmu *smmu)
+{
+	smmu_writel(smmu, SMMU_PTC_FLUSH_TYPE_ALL, SMMU_PTC_FLUSH);
+}
+
 static inline void smmu_flush_ptc(struct tegra_smmu *smmu, struct page *page,
 				  unsigned long offset)
 {
-	phys_addr_t phys = page ? page_to_phys(page) : 0;
+	phys_addr_t phys = page_to_phys(page);
 	u32 value;
 
-	if (page) {
 	offset &= ~(smmu->mc->soc->atom_size - 1);
 
 	if (smmu->mc->soc->num_address_bits > 32) {
@@ -184,10 +188,6 @@ static inline void smmu_flush_ptc(struct tegra_smmu *smmu, struct page *page,
 	}
 
 	value = (phys + offset) | SMMU_PTC_FLUSH_TYPE_ADR;
-	} else {
-		value = SMMU_PTC_FLUSH_TYPE_ALL;
-	}
-
 	smmu_writel(smmu, value, SMMU_PTC_FLUSH);
 }
 
@@ -894,7 +894,7 @@ struct tegra_smmu *tegra_smmu_probe(struct device *dev,
 
 	smmu_writel(smmu, value, SMMU_TLB_CONFIG);
 
-	smmu_flush_ptc(smmu, NULL, 0);
+	smmu_flush_ptc_all(smmu);
 	smmu_flush_tlb(smmu);
 	smmu_writel(smmu, SMMU_CONFIG_ENABLE, SMMU_CONFIG);
 	smmu_flush(smmu);