+From 0a9ec38c47c1ca4528aa058e2b9ea61901a7e632 Mon Sep 17 00:00:00 2001
+From: Komal Bajaj <quic_kbajaj@quicinc.com>
+Date: Tue, 1 Aug 2023 12:10:25 +0530
+Subject: [PATCH] nvmem: sec-qfprom: Add Qualcomm secure QFPROM support
+
+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,
+the OS will have to use secure calls to read the region.
+With that motivation, add secure qfprom driver.
+
+Signed-off-by: Komal Bajaj <quic_kbajaj@quicinc.com>
+Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
+---
+ drivers/nvmem/Kconfig | 13 ++++++
+ drivers/nvmem/Makefile | 2 +
+ drivers/nvmem/sec-qfprom.c | 96 ++++++++++++++++++++++++++++++++++++++
+ 3 files changed, 111 insertions(+)
+ create mode 100644 drivers/nvmem/sec-qfprom.c
+
+--- a/drivers/nvmem/Kconfig
++++ b/drivers/nvmem/Kconfig
+@@ -226,6 +226,19 @@ config NVMEM_QCOM_QFPROM
+ This driver can also be built as a module. If so, the module
+ will be called nvmem_qfprom.
+
++config NVMEM_QCOM_SEC_QFPROM
++ tristate "QCOM SECURE QFPROM Support"
++ depends on ARCH_QCOM || COMPILE_TEST
++ depends on HAS_IOMEM
++ depends on OF
++ select QCOM_SCM
++ help
++ Say y here to enable secure QFPROM support. The secure QFPROM provides access
++ functions for QFPROM data to rest of the drivers via nvmem interface.
++
++ This driver can also be built as a module. If so, the module will be called
++ nvmem_sec_qfprom.
++
+ config NVMEM_RAVE_SP_EEPROM
+ tristate "Rave SP EEPROM Support"
+ depends on RAVE_SP_CORE
+--- a/drivers/nvmem/Makefile
++++ b/drivers/nvmem/Makefile
+@@ -46,6 +46,8 @@ obj-$(CONFIG_NVMEM_NINTENDO_OTP) += nvme
+ nvmem-nintendo-otp-y := nintendo-otp.o
+ obj-$(CONFIG_NVMEM_QCOM_QFPROM) += nvmem_qfprom.o
+ nvmem_qfprom-y := qfprom.o
++obj-$(CONFIG_NVMEM_QCOM_SEC_QFPROM) += nvmem_sec_qfprom.o
++nvmem_sec_qfprom-y := sec-qfprom.o
+ obj-$(CONFIG_NVMEM_RAVE_SP_EEPROM) += nvmem-rave-sp-eeprom.o
+ nvmem-rave-sp-eeprom-y := rave-sp-eeprom.o
+ obj-$(CONFIG_NVMEM_RMEM) += nvmem-rmem.o
+--- /dev/null
++++ b/drivers/nvmem/sec-qfprom.c
+@@ -0,0 +1,96 @@
++// 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>
++
++/**
++ * struct sec_qfprom - structure holding secure qfprom attributes
++ *
++ * @base: starting physical address for secure qfprom corrected address space.
++ * @dev: qfprom device structure.
++ */
++struct sec_qfprom {
++ phys_addr_t base;
++ struct device *dev;
++};
++
++static int sec_qfprom_reg_read(void *context, unsigned int reg, void *_val, size_t bytes)
++{
++ struct sec_qfprom *priv = context;
++ unsigned int i;
++ u8 *val = _val;
++ u32 read_val;
++ u8 *tmp;
++
++ for (i = 0; i < bytes; i++, reg++) {
++ if (i == 0 || reg % 4 == 0) {
++ if (qcom_scm_io_readl(priv->base + (reg & ~3), &read_val)) {
++ dev_err(priv->dev, "Couldn't access fuse register\n");
++ return -EINVAL;
++ }
++ tmp = (u8 *)&read_val;
++ }
++
++ val[i] = tmp[reg & 3];
++ }
++
++ return 0;
++}
++
++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;
++
++ 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;
++
++ 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");