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6136a23263
Add basic CPU driver used to retrieve CPU model information. Tested-by: Daniel Golle <daniel@makrotopia.org> Signed-off-by: Weijie Gao <weijie.gao@mediatek.com> Reviewed-by: Simon Glass <sjg@chromium.org>
87 lines
1.7 KiB
C
87 lines
1.7 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Copyright (C) 2022 MediaTek Inc. All rights reserved.
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*
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* Author: Weijie Gao <weijie.gao@mediatek.com>
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*/
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#include <linux/types.h>
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#include <cpu.h>
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#include <dm.h>
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#include <regmap.h>
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#include <syscon.h>
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#include <asm/global_data.h>
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#include <linux/err.h>
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#include <linux/io.h>
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DECLARE_GLOBAL_DATA_PTR;
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struct mtk_cpu_plat {
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struct regmap *hwver;
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};
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static int mtk_cpu_get_desc(const struct udevice *dev, char *buf, int size)
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{
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struct mtk_cpu_plat *plat = dev_get_plat(dev);
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uint val;
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regmap_read(plat->hwver, 0, &val);
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snprintf(buf, size, "MediaTek MT%04X", val);
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return 0;
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}
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static int mtk_cpu_get_count(const struct udevice *dev)
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{
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return 1;
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}
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static int mtk_cpu_get_vendor(const struct udevice *dev, char *buf, int size)
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{
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snprintf(buf, size, "MediaTek");
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return 0;
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}
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static int mtk_cpu_probe(struct udevice *dev)
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{
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struct mtk_cpu_plat *plat = dev_get_plat(dev);
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struct ofnode_phandle_args args;
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int ret;
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ret = dev_read_phandle_with_args(dev, "mediatek,hwver", NULL, 0, 0,
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&args);
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if (ret)
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return ret;
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plat->hwver = syscon_node_to_regmap(args.node);
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if (IS_ERR(plat->hwver))
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return PTR_ERR(plat->hwver);
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return 0;
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}
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static const struct cpu_ops mtk_cpu_ops = {
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.get_desc = mtk_cpu_get_desc,
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.get_count = mtk_cpu_get_count,
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.get_vendor = mtk_cpu_get_vendor,
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};
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static const struct udevice_id mtk_cpu_ids[] = {
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{ .compatible = "arm,cortex-a7" },
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{ .compatible = "arm,cortex-a53" },
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{ .compatible = "arm,cortex-a73" },
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{ /* sentinel */ }
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};
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U_BOOT_DRIVER(cpu_mtk) = {
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.name = "mtk-cpu",
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.id = UCLASS_CPU,
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.of_match = mtk_cpu_ids,
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.ops = &mtk_cpu_ops,
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.probe = mtk_cpu_probe,
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.plat_auto = sizeof(struct mtk_cpu_plat),
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.flags = DM_FLAG_PRE_RELOC,
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};
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