iommu/exynos: Simplify master clock operations

All clock API function can be called on NULL clock, so simplify code avoid
checking of master clock presence.

Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com>
Signed-off-by: Joerg Roedel <jroedel@suse.de>

diff --git a/drivers/iommu/exynos-iommu.c b/drivers/iommu/exynos-iommu.c
index 8c8a7f7..bf6b826 100644 (file)
--- a/drivers/iommu/exynos-iommu.c
+++ b/drivers/iommu/exynos-iommu.c
@@ -333,8 +333,7 @@ static irqreturn_t exynos_sysmmu_irq(int irq, void *dev_id)
 
        spin_lock(&data->lock);
 
-       if (!IS_ERR(data->clk_master))
-               clk_enable(data->clk_master);
+       clk_enable(data->clk_master);
 
        itype = (enum exynos_sysmmu_inttype)
                __ffs(__raw_readl(data->sfrbase + REG_INT_STATUS));
@@ -366,8 +365,7 @@ static irqreturn_t exynos_sysmmu_irq(int irq, void *dev_id)
 
        sysmmu_unblock(data->sfrbase);
 
-       if (!IS_ERR(data->clk_master))
-               clk_disable(data->clk_master);
+       clk_disable(data->clk_master);
 
        spin_unlock(&data->lock);
 
@@ -376,15 +374,13 @@ static irqreturn_t exynos_sysmmu_irq(int irq, void *dev_id)
 
 static void __sysmmu_disable_nocount(struct sysmmu_drvdata *data)
 {
-       if (!IS_ERR(data->clk_master))
-               clk_enable(data->clk_master);
+       clk_enable(data->clk_master);
 
        __raw_writel(CTRL_DISABLE, data->sfrbase + REG_MMU_CTRL);
        __raw_writel(0, data->sfrbase + REG_MMU_CFG);
 
        clk_disable(data->clk);
-       if (!IS_ERR(data->clk_master))
-               clk_disable(data->clk_master);
+       clk_disable(data->clk_master);
 }
 
 static bool __sysmmu_disable(struct sysmmu_drvdata *data)
@@ -437,8 +433,7 @@ static void __sysmmu_init_config(struct sysmmu_drvdata *data)
 
 static void __sysmmu_enable_nocount(struct sysmmu_drvdata *data)
 {
-       if (!IS_ERR(data->clk_master))
-               clk_enable(data->clk_master);
+       clk_enable(data->clk_master);
        clk_enable(data->clk);
 
        __raw_writel(CTRL_BLOCK, data->sfrbase + REG_MMU_CTRL);
@@ -449,8 +444,7 @@ static void __sysmmu_enable_nocount(struct sysmmu_drvdata *data)
 
        __raw_writel(CTRL_ENABLE, data->sfrbase + REG_MMU_CTRL);
 
-       if (!IS_ERR(data->clk_master))
-               clk_disable(data->clk_master);
+       clk_disable(data->clk_master);
 }
 
 static int __sysmmu_enable(struct sysmmu_drvdata *data, phys_addr_t pgtable,
@@ -493,16 +487,14 @@ static void sysmmu_tlb_invalidate_flpdcache(struct sysmmu_drvdata *data,
 {
        unsigned long flags;
 
-       if (!IS_ERR(data->clk_master))
-               clk_enable(data->clk_master);
+       clk_enable(data->clk_master);
 
        spin_lock_irqsave(&data->lock, flags);
        if (is_sysmmu_active(data))
                __sysmmu_tlb_invalidate_flpdcache(data, iova);
        spin_unlock_irqrestore(&data->lock, flags);
 
-       if (!IS_ERR(data->clk_master))
-               clk_disable(data->clk_master);
+       clk_disable(data->clk_master);
 }
 
 static void sysmmu_tlb_invalidate_entry(struct sysmmu_drvdata *data,
@@ -514,8 +506,7 @@ static void sysmmu_tlb_invalidate_entry(struct sysmmu_drvdata *data,
        if (is_sysmmu_active(data)) {
                unsigned int num_inv = 1;
 
-               if (!IS_ERR(data->clk_master))
-                       clk_enable(data->clk_master);
+               clk_enable(data->clk_master);
 
                /*
                 * L2TLB invalidation required
@@ -535,8 +526,7 @@ static void sysmmu_tlb_invalidate_entry(struct sysmmu_drvdata *data,
                                data->sfrbase, iova, num_inv);
                        sysmmu_unblock(data->sfrbase);
                }
-               if (!IS_ERR(data->clk_master))
-                       clk_disable(data->clk_master);
+               clk_disable(data->clk_master);
        } else {
                dev_dbg(data->master,
                        "disabled. Skipping TLB invalidation @ %#x\n", iova);
@@ -593,6 +583,8 @@ static int __init exynos_sysmmu_probe(struct platform_device *pdev)
                        dev_err(dev, "Failed to prepare master's clk\n");
                        return ret;
                }
+       } else {
+               data->clk_master = NULL;
        }
 
        data->sysmmu = dev;