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Commit 850d313e authored by Marek Szyprowski's avatar Marek Szyprowski Committed by Joerg Roedel
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iommu/exynos: Add support for SYSMMU controller with bogus version reg 



SYSMMU on some SoCs reports bogus values in VERSION register. Force
hardware version to 1.0 for such controllers. This patch also moves reading
version register to driver's probe() function.

Signed-off-by: default avatarMarek Szyprowski <m.szyprowski@samsung.com>
Signed-off-by: default avatarJoerg Roedel <jroedel@suse.de>
parent d631ea98

drivers/iommu/exynos-iommu.c

+23 −1
Original line number Diff line number Diff line
@@ -284,6 +284,28 @@ static void __sysmmu_set_ptbase(struct sysmmu_drvdata *data, phys_addr_t pgd) 
	__sysmmu_tlb_invalidate(data);

}



static void __sysmmu_get_version(struct sysmmu_drvdata *data)

{

	u32 ver;



	clk_enable(data->clk_master);

	clk_enable(data->clk);



	ver = __raw_readl(data->sfrbase + REG_MMU_VERSION);



	/* controllers on some SoCs don't report proper version */

	if (ver == 0x80000001u)

		data->version = MAKE_MMU_VER(1, 0);

	else

		data->version = MMU_RAW_VER(ver);



	dev_dbg(data->sysmmu, "hardware version: %d.%d\n",

		MMU_MAJ_VER(data->version), MMU_MIN_VER(data->version));



	clk_disable(data->clk);

	clk_disable(data->clk_master);

}



static void show_fault_information(struct sysmmu_drvdata *data,

				   const struct sysmmu_fault_info *finfo,

				   sysmmu_iova_t fault_addr)
@@ -385,7 +407,6 @@ static void __sysmmu_init_config(struct sysmmu_drvdata *data) 
{

	unsigned int cfg;



	data->version = MMU_RAW_VER(__raw_readl(data->sfrbase + REG_MMU_VERSION));

	if (data->version <= MAKE_MMU_VER(3, 1))

		cfg = CFG_LRU | CFG_QOS(15);

	else if (data->version <= MAKE_MMU_VER(3, 2))
@@ -551,6 +572,7 @@ static int __init exynos_sysmmu_probe(struct platform_device *pdev) 


	platform_set_drvdata(pdev, data);



	__sysmmu_get_version(data);

	pm_runtime_enable(dev);



	return 0;