147 строки
3.5 KiB
C
147 строки
3.5 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Copyright (c) 2015 MediaTek Inc.
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* Author: Andrew-CT Chen <andrew-ct.chen@mediatek.com>
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*/
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#include <linux/device.h>
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#include <linux/module.h>
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#include <linux/mod_devicetable.h>
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#include <linux/io.h>
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#include <linux/nvmem-provider.h>
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#include <linux/platform_device.h>
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#include <linux/property.h>
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struct mtk_efuse_pdata {
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bool uses_post_processing;
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};
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struct mtk_efuse_priv {
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void __iomem *base;
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};
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static int mtk_reg_read(void *context,
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unsigned int reg, void *_val, size_t bytes)
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{
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struct mtk_efuse_priv *priv = context;
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void __iomem *addr = priv->base + reg;
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u8 *val = _val;
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int i;
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for (i = 0; i < bytes; i++, val++)
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*val = readb(addr + i);
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return 0;
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}
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static int mtk_efuse_gpu_speedbin_pp(void *context, const char *id, int index,
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unsigned int offset, void *data, size_t bytes)
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{
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u8 *val = data;
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if (val[0] < 8)
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val[0] = BIT(val[0]);
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return 0;
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}
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static void mtk_efuse_fixup_cell_info(struct nvmem_device *nvmem,
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struct nvmem_layout *layout,
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struct nvmem_cell_info *cell)
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{
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size_t sz = strlen(cell->name);
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/*
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* On some SoCs, the GPU speedbin is not read as bitmask but as
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* a number with range [0-7] (max 3 bits): post process to use
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* it in OPP tables to describe supported-hw.
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*/
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if (cell->nbits <= 3 &&
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strncmp(cell->name, "gpu-speedbin", min(sz, strlen("gpu-speedbin"))) == 0)
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cell->read_post_process = mtk_efuse_gpu_speedbin_pp;
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}
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static struct nvmem_layout mtk_efuse_layout = {
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.fixup_cell_info = mtk_efuse_fixup_cell_info,
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};
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static int mtk_efuse_probe(struct platform_device *pdev)
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{
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struct device *dev = &pdev->dev;
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struct resource *res;
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struct nvmem_device *nvmem;
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struct nvmem_config econfig = {};
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struct mtk_efuse_priv *priv;
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const struct mtk_efuse_pdata *pdata;
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priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
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if (!priv)
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return -ENOMEM;
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priv->base = devm_platform_get_and_ioremap_resource(pdev, 0, &res);
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if (IS_ERR(priv->base))
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return PTR_ERR(priv->base);
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pdata = device_get_match_data(dev);
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econfig.stride = 1;
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econfig.word_size = 1;
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econfig.reg_read = mtk_reg_read;
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econfig.size = resource_size(res);
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econfig.priv = priv;
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econfig.dev = dev;
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if (pdata->uses_post_processing)
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econfig.layout = &mtk_efuse_layout;
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nvmem = devm_nvmem_register(dev, &econfig);
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return PTR_ERR_OR_ZERO(nvmem);
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}
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static const struct mtk_efuse_pdata mtk_mt8186_efuse_pdata = {
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.uses_post_processing = true,
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};
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static const struct mtk_efuse_pdata mtk_efuse_pdata = {
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.uses_post_processing = false,
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};
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static const struct of_device_id mtk_efuse_of_match[] = {
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{ .compatible = "mediatek,mt8173-efuse", .data = &mtk_efuse_pdata },
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{ .compatible = "mediatek,mt8186-efuse", .data = &mtk_mt8186_efuse_pdata },
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{ .compatible = "mediatek,efuse", .data = &mtk_efuse_pdata },
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{/* sentinel */},
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};
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MODULE_DEVICE_TABLE(of, mtk_efuse_of_match);
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static struct platform_driver mtk_efuse_driver = {
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.probe = mtk_efuse_probe,
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.driver = {
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.name = "mediatek,efuse",
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.of_match_table = mtk_efuse_of_match,
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},
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};
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static int __init mtk_efuse_init(void)
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{
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int ret;
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ret = platform_driver_register(&mtk_efuse_driver);
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if (ret) {
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pr_err("Failed to register efuse driver\n");
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return ret;
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}
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return 0;
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}
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static void __exit mtk_efuse_exit(void)
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{
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return platform_driver_unregister(&mtk_efuse_driver);
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}
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subsys_initcall(mtk_efuse_init);
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module_exit(mtk_efuse_exit);
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MODULE_AUTHOR("Andrew-CT Chen <andrew-ct.chen@mediatek.com>");
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MODULE_DESCRIPTION("Mediatek EFUSE driver");
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MODULE_LICENSE("GPL v2");
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