From: Cho KyongHo Date: Mon, 12 May 2014 06:14:50 +0000 (+0530) Subject: iommu/exynos: Remove prefetch buffer setting X-Git-Tag: firefly_0821_release~176^2~3820^2~8^2^5~19 X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=8f8fcf970e5866150af98233ae7ebf25ffe8cba7;p=firefly-linux-kernel-4.4.55.git iommu/exynos: Remove prefetch buffer setting Prefetch buffer is a cache of System MMU 3.x and caches a block of page table entries to make effect of larger page with small pages. However, how to control prefetch buffers and the specifications of prefetch buffers different from minor versions of System MMU v3. Prefetch buffers must be controled with care because there are some restrictions in H/W design. The interface and implementation to initiate prefetch buffers will be prepared later. Signed-off-by: Cho KyongHo Signed-off-by: Shaik Ameer Basha Signed-off-by: Joerg Roedel --- diff --git a/drivers/iommu/exynos-iommu.c b/drivers/iommu/exynos-iommu.c index 06fc70ee4389..4fc31fc6a49a 100644 --- a/drivers/iommu/exynos-iommu.c +++ b/drivers/iommu/exynos-iommu.c @@ -245,13 +245,6 @@ static void __sysmmu_set_ptbase(void __iomem *sfrbase, __sysmmu_tlb_invalidate(sfrbase); } -static void __sysmmu_set_prefbuf(void __iomem *sfrbase, unsigned long base, - unsigned long size, int idx) -{ - __raw_writel(base, sfrbase + REG_PB0_SADDR + idx * 8); - __raw_writel(size - 1 + base, sfrbase + REG_PB0_EADDR + idx * 8); -} - static void __set_fault_handler(struct sysmmu_drvdata *data, sysmmu_fault_handler_t handler) { @@ -401,13 +394,6 @@ static int __exynos_sysmmu_enable(struct sysmmu_drvdata *data, data->pgtable = pgtable; __sysmmu_set_ptbase(data->sfrbase, pgtable); - if ((readl(data->sfrbase + REG_MMU_VERSION) >> 28) == 3) { - /* System MMU version is 3.x */ - __raw_writel((1 << 12) | (2 << 28), - data->sfrbase + REG_MMU_CFG); - __sysmmu_set_prefbuf(data->sfrbase, 0, -1, 0); - __sysmmu_set_prefbuf(data->sfrbase, 0, -1, 1); - } __raw_writel(CTRL_ENABLE, data->sfrbase + REG_MMU_CTRL);