Commit 5bc1cf14 authored by Shawn Guo's avatar Shawn Guo Committed by Joerg Roedel
Browse files

iommu/qcom: add optional 'tbu' clock for TLB invalidate 



On some SoCs like MSM8939 with A405 adreno, there is a gfx_tbu clock
needs to be on while doing TLB invalidate. Otherwise, TLBSYNC status
will not be correctly reflected, causing the system to go into a bad
state.  Add it as an optional clock, so that platforms that have this
clock can pass it over DT.

While adding the third clock, let's switch to bulk clk API to simplify
the enable/disable calls.  clk_bulk_get() cannot used because the
existing two clocks are required while the new one is optional.

Signed-off-by: default avatarShawn Guo <shawn.guo@linaro.org>
Reviewed-by: default avatarBjorn Andersson <bjorn.andersson@linaro.org>
Link: https://lore.kernel.org/r/20200518141656.26284-1-shawn.guo@linaro.org


Signed-off-by: default avatarJoerg Roedel <jroedel@suse.de>
parent 6a8b55ed

drivers/iommu/qcom_iommu.c

+26 −36
Original line number Diff line number Diff line
@@ -37,14 +37,20 @@ 


#define SMMU_INTR_SEL_NS     0x2000



enum qcom_iommu_clk {

	CLK_IFACE,

	CLK_BUS,

	CLK_TBU,

	CLK_NUM,

};



struct qcom_iommu_ctx;



struct qcom_iommu_dev {

	/* IOMMU core code handle */

	struct iommu_device	 iommu;

	struct device		*dev;

	struct clk		*iface_clk;

	struct clk		*bus_clk;

	struct clk_bulk_data clks[CLK_NUM];

	void __iomem		*local_base;

	u32			 sec_id;

	u8			 num_ctxs;
@@ -626,32 +632,6 @@ static const struct iommu_ops qcom_iommu_ops = { 
	.pgsize_bitmap	= SZ_4K | SZ_64K | SZ_1M | SZ_16M,

};



static int qcom_iommu_enable_clocks(struct qcom_iommu_dev *qcom_iommu)

{

	int ret;



	ret = clk_prepare_enable(qcom_iommu->iface_clk);

	if (ret) {

		dev_err(qcom_iommu->dev, "Couldn't enable iface_clk\n");

		return ret;

	}



	ret = clk_prepare_enable(qcom_iommu->bus_clk);

	if (ret) {

		dev_err(qcom_iommu->dev, "Couldn't enable bus_clk\n");

		clk_disable_unprepare(qcom_iommu->iface_clk);

		return ret;

	}



	return 0;

}



static void qcom_iommu_disable_clocks(struct qcom_iommu_dev *qcom_iommu)

{

	clk_disable_unprepare(qcom_iommu->bus_clk);

	clk_disable_unprepare(qcom_iommu->iface_clk);

}



static int qcom_iommu_sec_ptbl_init(struct device *dev)

{

	size_t psize = 0;
@@ -808,6 +788,7 @@ static int qcom_iommu_device_probe(struct platform_device *pdev) 
	struct qcom_iommu_dev *qcom_iommu;

	struct device *dev = &pdev->dev;

	struct resource *res;

	struct clk *clk;

	int ret, max_asid = 0;



	/* find the max asid (which is 1:1 to ctx bank idx), so we know how
@@ -827,17 +808,26 @@ static int qcom_iommu_device_probe(struct platform_device *pdev) 
	if (res)

		qcom_iommu->local_base = devm_ioremap_resource(dev, res);



	qcom_iommu->iface_clk = devm_clk_get(dev, "iface");

	if (IS_ERR(qcom_iommu->iface_clk)) {

	clk = devm_clk_get(dev, "iface");

	if (IS_ERR(clk)) {

		dev_err(dev, "failed to get iface clock\n");

		return PTR_ERR(qcom_iommu->iface_clk);

		return PTR_ERR(clk);

	}

	qcom_iommu->clks[CLK_IFACE].clk = clk;



	qcom_iommu->bus_clk = devm_clk_get(dev, "bus");

	if (IS_ERR(qcom_iommu->bus_clk)) {

	clk = devm_clk_get(dev, "bus");

	if (IS_ERR(clk)) {

		dev_err(dev, "failed to get bus clock\n");

		return PTR_ERR(qcom_iommu->bus_clk);

		return PTR_ERR(clk);

	}

	qcom_iommu->clks[CLK_BUS].clk = clk;



	clk = devm_clk_get_optional(dev, "tbu");

	if (IS_ERR(clk)) {

		dev_err(dev, "failed to get tbu clock\n");

		return PTR_ERR(clk);

	}

	qcom_iommu->clks[CLK_TBU].clk = clk;



	if (of_property_read_u32(dev->of_node, "qcom,iommu-secure-id",

				 &qcom_iommu->sec_id)) {
@@ -909,14 +899,14 @@ static int __maybe_unused qcom_iommu_resume(struct device *dev) 
{

	struct qcom_iommu_dev *qcom_iommu = dev_get_drvdata(dev);



	return qcom_iommu_enable_clocks(qcom_iommu);

	return clk_bulk_prepare_enable(CLK_NUM, qcom_iommu->clks);

}



static int __maybe_unused qcom_iommu_suspend(struct device *dev)

{

	struct qcom_iommu_dev *qcom_iommu = dev_get_drvdata(dev);



	qcom_iommu_disable_clocks(qcom_iommu);

	clk_bulk_disable_unprepare(CLK_NUM, qcom_iommu->clks);



	return 0;

}