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70 lines
2.0 KiB
Diff
70 lines
2.0 KiB
Diff
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From 15a0487680cf506bb4b9bfee2c41b2c3176d4efa Mon Sep 17 00:00:00 2001
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From: Samuel Holland <samuel@sholland.org>
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Date: Wed, 27 Apr 2022 19:01:57 -0500
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Subject: [PATCH 050/117] iommu/sun50i: Support variants without an external
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reset
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The IOMMU in the Allwinner D1 SoC does not have an external reset line.
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Only attempt to get the reset on hardware variants which should have one
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according to the binding. And switch from the deprecated function to the
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explicit "exclusive" variant.
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Signed-off-by: Samuel Holland <samuel@sholland.org>
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---
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drivers/iommu/sun50i-iommu.c | 18 ++++++++++++++++--
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1 file changed, 16 insertions(+), 2 deletions(-)
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--- a/drivers/iommu/sun50i-iommu.c
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+++ b/drivers/iommu/sun50i-iommu.c
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@@ -95,6 +95,10 @@
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#define SPAGE_SIZE 4096
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+struct sun50i_iommu_variant {
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+ bool has_reset;
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+};
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+
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struct sun50i_iommu {
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struct iommu_device iommu;
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@@ -979,9 +983,14 @@ static irqreturn_t sun50i_iommu_irq(int
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static int sun50i_iommu_probe(struct platform_device *pdev)
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{
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+ const struct sun50i_iommu_variant *variant;
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struct sun50i_iommu *iommu;
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int ret, irq;
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+ variant = of_device_get_match_data(&pdev->dev);
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+ if (!variant)
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+ return -EINVAL;
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+
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iommu = devm_kzalloc(&pdev->dev, sizeof(*iommu), GFP_KERNEL);
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if (!iommu)
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return -ENOMEM;
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@@ -1021,7 +1030,8 @@ static int sun50i_iommu_probe(struct pla
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goto err_free_group;
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}
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- iommu->reset = devm_reset_control_get(&pdev->dev, NULL);
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+ if (variant->has_reset)
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+ iommu->reset = devm_reset_control_get_exclusive(&pdev->dev, NULL);
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if (IS_ERR(iommu->reset)) {
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dev_err(&pdev->dev, "Couldn't get our reset line.\n");
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ret = PTR_ERR(iommu->reset);
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@@ -1059,8 +1069,12 @@ err_free_cache:
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return ret;
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}
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+static const struct sun50i_iommu_variant sun50i_h6_iommu = {
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+ .has_reset = true,
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+};
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+
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static const struct of_device_id sun50i_iommu_dt[] = {
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- { .compatible = "allwinner,sun50i-h6-iommu", },
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+ { .compatible = "allwinner,sun50i-h6-iommu", .data = &sun50i_h6_iommu },
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{ /* sentinel */ },
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};
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MODULE_DEVICE_TABLE(of, sun50i_iommu_dt);
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