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88 lines
2.8 KiB
Diff
88 lines
2.8 KiB
Diff
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From 044ee8f85267599a9b0112911f5c16d4548b4289 Mon Sep 17 00:00:00 2001
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From: Evan Green <evgreen@chromium.org>
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Date: Fri, 27 Nov 2020 10:28:36 +0000
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Subject: [PATCH] nvmem: qfprom: Don't touch certain fuses
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Some fuse ranges are protected by the XPU such that the AP cannot
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access them. Attempting to do so causes an SError. Use the newly
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introduced per-soc compatible string, and the newly introduced
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nvmem keepout support to attach the set of regions
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we should not access.
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Reviewed-by: Douglas Anderson <dianders@chromium.org>
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Signed-off-by: Evan Green <evgreen@chromium.org>
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Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
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Link: https://lore.kernel.org/r/20201127102837.19366-5-srinivas.kandagatla@linaro.org
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Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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---
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drivers/nvmem/qfprom.c | 30 ++++++++++++++++++++++++++++++
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1 file changed, 30 insertions(+)
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--- a/drivers/nvmem/qfprom.c
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+++ b/drivers/nvmem/qfprom.c
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@@ -12,6 +12,7 @@
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#include <linux/mod_devicetable.h>
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#include <linux/nvmem-provider.h>
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#include <linux/platform_device.h>
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+#include <linux/property.h>
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#include <linux/regulator/consumer.h>
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/* Blow timer clock frequency in Mhz */
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@@ -89,6 +90,28 @@ struct qfprom_touched_values {
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};
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/**
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+ * struct qfprom_soc_compatible_data - Data matched against the SoC
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+ * compatible string.
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+ *
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+ * @keepout: Array of keepout regions for this SoC.
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+ * @nkeepout: Number of elements in the keepout array.
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+ */
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+struct qfprom_soc_compatible_data {
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+ const struct nvmem_keepout *keepout;
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+ unsigned int nkeepout;
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+};
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+
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+static const struct nvmem_keepout sc7180_qfprom_keepout[] = {
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+ {.start = 0x128, .end = 0x148},
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+ {.start = 0x220, .end = 0x228}
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+};
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+
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+static const struct qfprom_soc_compatible_data sc7180_qfprom = {
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+ .keepout = sc7180_qfprom_keepout,
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+ .nkeepout = ARRAY_SIZE(sc7180_qfprom_keepout)
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+};
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+
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+/**
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* qfprom_disable_fuse_blowing() - Undo enabling of fuse blowing.
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* @priv: Our driver data.
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* @old: The data that was stashed from before fuse blowing.
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@@ -302,6 +325,7 @@ static int qfprom_probe(struct platform_
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struct device *dev = &pdev->dev;
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struct resource *res;
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struct nvmem_device *nvmem;
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+ const struct qfprom_soc_compatible_data *soc_data;
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struct qfprom_priv *priv;
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int ret;
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@@ -320,6 +344,11 @@ static int qfprom_probe(struct platform_
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econfig.priv = priv;
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priv->dev = dev;
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+ soc_data = device_get_match_data(dev);
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+ if (soc_data) {
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+ econfig.keepout = soc_data->keepout;
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+ econfig.nkeepout = soc_data->nkeepout;
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+ }
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/*
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* If more than one region is provided then the OS has the ability
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@@ -375,6 +404,7 @@ static int qfprom_probe(struct platform_
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static const struct of_device_id qfprom_of_match[] = {
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{ .compatible = "qcom,qfprom",},
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+ { .compatible = "qcom,sc7180-qfprom", .data = &sc7180_qfprom},
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{/* sentinel */},
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};
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MODULE_DEVICE_TABLE(of, qfprom_of_match);
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