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49 lines
1.2 KiB
C
49 lines
1.2 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Copyright (c) 2020 Bjørn Mork <bjorn@mork.no>
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*/
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#include <linux/io.h>
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#include <linux/module.h>
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#define MODULE_NAME "mt7621-qtn-rgmii"
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#define RGMII_REG_BASE 0x1e110008
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#define RGMII_REG_SIZE 4
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#define RGMII_REG_VALUE 0x9000c
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static u32 oldval;
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static int __init mt7621_qtn_rgmii_init(void)
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{
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void __iomem *base = ioremap(RGMII_REG_BASE, RGMII_REG_SIZE);
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if (!base)
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return -ENOMEM;
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oldval = ioread32(base);
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if (oldval != RGMII_REG_VALUE) {
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iowrite32(RGMII_REG_VALUE, base);
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pr_info(MODULE_NAME ": changed register 0x%08x value from 0x%08x to 0x%08x\n", RGMII_REG_BASE, oldval, RGMII_REG_VALUE);
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}
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iounmap(base);
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return 0;
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}
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static void __exit mt7621_qtn_rgmii_exit(void)
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{
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void __iomem *base = ioremap(RGMII_REG_BASE, RGMII_REG_SIZE);
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if (!base)
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return;
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if (oldval != RGMII_REG_VALUE) {
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iowrite32(oldval, base);
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pr_info(MODULE_NAME ": reset register 0x%08x back to 0x%08x\n", RGMII_REG_BASE, oldval);
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}
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iounmap(base);
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}
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module_init(mt7621_qtn_rgmii_init);
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module_exit(mt7621_qtn_rgmii_exit);
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MODULE_LICENSE("GPL");
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MODULE_AUTHOR("Bjørn Mork <bjorn@mork.no>");
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MODULE_DESCRIPTION("Enable RGMII connected Quantenna module on MT7621");
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