On 24/07/2023 09:38, Komal Bajaj wrote:
For some of the Qualcomm SoC's, it is possible that
some of the fuse regions or entire qfprom region is
protected from non-secure access. In such situations,
Linux will have to use secure calls to read the region.
With that motivation, add secure qfprom driver.
Signed-off-by: Komal Bajaj <quic_kbajaj@xxxxxxxxxxx>
---
drivers/nvmem/Kconfig | 13 +++++
drivers/nvmem/Makefile | 2 +
drivers/nvmem/sec-qfprom.c | 101 +++++++++++++++++++++++++++++++++++++
3 files changed, 116 insertions(+)
create mode 100644 drivers/nvmem/sec-qfprom.c
diff --git a/drivers/nvmem/sec-qfprom.c b/drivers/nvmem/sec-qfprom.c
new file mode 100644
index 000000000000..bc68053b7d94
--- /dev/null
+++ b/drivers/nvmem/sec-qfprom.c
@@ -0,0 +1,101 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright (c) 2023, Qualcomm Innovation Center, Inc. All rights reserved.
+ */
+
+#include <linux/firmware/qcom/qcom_scm.h>
+#include <linux/mod_devicetable.h>
+#include <linux/nvmem-provider.h>
+#include <linux/platform_device.h>
+#include <linux/pm_runtime.h>
+
+static int sec_qfprom_probe(struct platform_device *pdev)
+{
+ struct nvmem_config econfig = {
+ .name = "sec-qfprom",
+ .stride = 1,
+ .word_size = 1,
+ .id = NVMEM_DEVID_AUTO,
+ .reg_read = sec_qfprom_reg_read,
+ };
+ struct device *dev = &pdev->dev;
+ struct nvmem_device *nvmem;
+ struct sec_qfprom *priv;
+ struct resource *res;
+ int ret;
+
+ priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
+ if (!priv)
+ return -ENOMEM;
+
+ res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ if (!res)
+ return -EINVAL;
+
+ priv->base = res->start;
+
+ econfig.size = resource_size(res);
+ econfig.dev = dev;
+ econfig.priv = priv;
+
+ priv->dev = dev;
+
+ ret = devm_pm_runtime_enable(dev);
+ if (ret)
+ return ret;
Any reason why we need to enable pm runtime for this driver? As Am not
seeing any pm runtime handlers or users in this driver.
--srini
+
+ nvmem = devm_nvmem_register(dev, &econfig);
+
+ return PTR_ERR_OR_ZERO(nvmem);
+}
+
+static const struct of_device_id sec_qfprom_of_match[] = {
+ { .compatible = "qcom,sec-qfprom" },
+ {/* sentinel */},
+};
+MODULE_DEVICE_TABLE(of, sec_qfprom_of_match);
+
+static struct platform_driver qfprom_driver = {
+ .probe = sec_qfprom_probe,
+ .driver = {
+ .name = "qcom_sec_qfprom",
+ .of_match_table = sec_qfprom_of_match,
+ },
+};
+module_platform_driver(qfprom_driver);
+MODULE_DESCRIPTION("Qualcomm Secure QFPROM driver");
+MODULE_LICENSE("GPL");
--
2.40.1
