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// 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");
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