98 lines
2.2 KiB
C
98 lines
2.2 KiB
C
// 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",
|
|
.add_legacy_fixed_of_cells = true,
|
|
.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");
|