86 lines
2.2 KiB
C
86 lines
2.2 KiB
C
/*
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* Copyright (c) 2014, The Linux foundation. All rights reserved.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License rev 2 and
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* only rev 2 as published by the free Software foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or fITNESS fOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*/
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#include <linux/clk.h>
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#include <linux/err.h>
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#include <linux/io.h>
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#include <linux/module.h>
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#include <linux/of.h>
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#include <linux/of_platform.h>
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#include <linux/platform_device.h>
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#define GSBI_CTRL_REG 0x0000
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#define GSBI_PROTOCOL_SHIFT 4
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static int gsbi_probe(struct platform_device *pdev)
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{
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struct device_node *node = pdev->dev.of_node;
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struct resource *res;
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void __iomem *base;
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struct clk *hclk;
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u32 mode, crci = 0;
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res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
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base = devm_ioremap_resource(&pdev->dev, res);
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if (IS_ERR(base))
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return PTR_ERR(base);
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if (of_property_read_u32(node, "qcom,mode", &mode)) {
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dev_err(&pdev->dev, "missing mode configuration\n");
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return -EINVAL;
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}
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/* not required, so default to 0 if not present */
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of_property_read_u32(node, "qcom,crci", &crci);
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dev_info(&pdev->dev, "GSBI port protocol: %d crci: %d\n", mode, crci);
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hclk = devm_clk_get(&pdev->dev, "iface");
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if (IS_ERR(hclk))
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return PTR_ERR(hclk);
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clk_prepare_enable(hclk);
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writel_relaxed((mode << GSBI_PROTOCOL_SHIFT) | crci,
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base + GSBI_CTRL_REG);
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/* make sure the gsbi control write is not reordered */
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wmb();
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clk_disable_unprepare(hclk);
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return of_platform_populate(pdev->dev.of_node, NULL, NULL, &pdev->dev);
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}
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static const struct of_device_id gsbi_dt_match[] = {
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{ .compatible = "qcom,gsbi-v1.0.0", },
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{ },
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};
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MODULE_DEVICE_TABLE(of, gsbi_dt_match);
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static struct platform_driver gsbi_driver = {
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.driver = {
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.name = "gsbi",
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.owner = THIS_MODULE,
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.of_match_table = gsbi_dt_match,
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},
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.probe = gsbi_probe,
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};
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module_platform_driver(gsbi_driver);
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MODULE_AUTHOR("Andy Gross <agross@codeaurora.org>");
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MODULE_DESCRIPTION("QCOM GSBI driver");
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MODULE_LICENSE("GPL v2");
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