Orange Pi5 kernel

// SPDX-License-Identifier: GPL-2.0-only
/*
 * Amlogic Meson GX eFuse Driver
 *
 * Copyright (c) 2016 Endless Computers, Inc.
 * Author: Carlo Caione <carlo@endlessm.com>
 */
 
#include <linux/clk.h>
#include <linux/module.h>
#include <linux/nvmem-provider.h>
#include <linux/of.h>
#include <linux/platform_device.h>
 
#include <linux/firmware/meson/meson_sm.h>
 
static int meson_efuse_read(void *context, unsigned int offset,
<------><------><------>    void *val, size_t bytes)
{
<------>struct meson_sm_firmware *fw = context;
 
<------>return meson_sm_call_read(fw, (u8 *)val, bytes, SM_EFUSE_READ, offset,
<------><------><------><------>  bytes, 0, 0, 0);
}
 
static int meson_efuse_write(void *context, unsigned int offset,
<------><------><------>     void *val, size_t bytes)
{
<------>struct meson_sm_firmware *fw = context;
 
<------>return meson_sm_call_write(fw, (u8 *)val, bytes, SM_EFUSE_WRITE, offset,
<------><------><------><------>   bytes, 0, 0, 0);
}
 
static const struct of_device_id meson_efuse_match[] = {
<------>{ .compatible = "amlogic,meson-gxbb-efuse", },
<------>{ /* sentinel */ },
};
MODULE_DEVICE_TABLE(of, meson_efuse_match);
 
static int meson_efuse_probe(struct platform_device *pdev)
{
<------>struct device *dev = &pdev->dev;
<------>struct meson_sm_firmware *fw;
<------>struct device_node *sm_np;
<------>struct nvmem_device *nvmem;
<------>struct nvmem_config *econfig;
<------>struct clk *clk;
<------>unsigned int size;
<------>int ret;
 
<------>sm_np = of_parse_phandle(pdev->dev.of_node, "secure-monitor", 0);
<------>if (!sm_np) {
<------><------>dev_err(&pdev->dev, "no secure-monitor node\n");
<------><------>return -ENODEV;
<------>}
 
<------>fw = meson_sm_get(sm_np);
<------>of_node_put(sm_np);
<------>if (!fw)
<------><------>return -EPROBE_DEFER;
 
<------>clk = devm_clk_get(dev, NULL);
<------>if (IS_ERR(clk)) {
<------><------>ret = PTR_ERR(clk);
<------><------>if (ret != -EPROBE_DEFER)
<------><------><------>dev_err(dev, "failed to get efuse gate");
<------><------>return ret;
<------>}
 
<------>ret = clk_prepare_enable(clk);
<------>if (ret) {
<------><------>dev_err(dev, "failed to enable gate");
<------><------>return ret;
<------>}
 
<------>ret = devm_add_action_or_reset(dev,
<------><------><------><------>       (void(*)(void *))clk_disable_unprepare,
<------><------><------><------>       clk);
<------>if (ret) {
<------><------>dev_err(dev, "failed to add disable callback");
<------><------>return ret;
<------>}
 
<------>if (meson_sm_call(fw, SM_EFUSE_USER_MAX, &size, 0, 0, 0, 0, 0) < 0) {
<------><------>dev_err(dev, "failed to get max user");
<------><------>return -EINVAL;
<------>}
 
<------>econfig = devm_kzalloc(dev, sizeof(*econfig), GFP_KERNEL);
<------>if (!econfig)
<------><------>return -ENOMEM;
 
<------>econfig->dev = dev;
<------>econfig->name = dev_name(dev);
<------>econfig->stride = 1;
<------>econfig->word_size = 1;
<------>econfig->reg_read = meson_efuse_read;
<------>econfig->reg_write = meson_efuse_write;
<------>econfig->size = size;
<------>econfig->priv = fw;
 
<------>nvmem = devm_nvmem_register(&pdev->dev, econfig);
 
<------>return PTR_ERR_OR_ZERO(nvmem);
}
 
static struct platform_driver meson_efuse_driver = {
<------>.probe = meson_efuse_probe,
<------>.driver = {
<------><------>.name = "meson-efuse",
<------><------>.of_match_table = meson_efuse_match,
<------>},
};
 
module_platform_driver(meson_efuse_driver);
 
MODULE_AUTHOR("Carlo Caione <carlo@endlessm.com>");
MODULE_DESCRIPTION("Amlogic Meson GX NVMEM driver");
MODULE_LICENSE("GPL v2");