97 lines
2.1 KiB
C
97 lines
2.1 KiB
C
// SPDX-License-Identifier: GPL-2.0
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//
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// Copyright (C) 2019 Texas Instruments Incorporated - http://www.ti.com/
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//
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#include <linux/clk.h>
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#include <linux/io.h>
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/of_platform.h>
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#include <linux/platform_device.h>
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#include <linux/pm_runtime.h>
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#define TI_UFS_SS_CTRL 0x4
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#define TI_UFS_SS_RST_N_PCS BIT(0)
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#define TI_UFS_SS_CLK_26MHZ BIT(4)
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static int ti_j721e_ufs_probe(struct platform_device *pdev)
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{
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struct device *dev = &pdev->dev;
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unsigned long clk_rate;
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void __iomem *regbase;
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struct clk *clk;
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u32 reg = 0;
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int ret;
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regbase = devm_platform_ioremap_resource(pdev, 0);
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if (IS_ERR(regbase))
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return PTR_ERR(regbase);
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pm_runtime_enable(dev);
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ret = pm_runtime_resume_and_get(dev);
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if (ret < 0)
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goto disable_pm;
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/* Select MPHY refclk frequency */
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clk = devm_clk_get(dev, NULL);
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if (IS_ERR(clk)) {
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ret = PTR_ERR(clk);
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dev_err(dev, "Cannot claim MPHY clock.\n");
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goto clk_err;
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}
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clk_rate = clk_get_rate(clk);
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if (clk_rate == 26000000)
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reg |= TI_UFS_SS_CLK_26MHZ;
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devm_clk_put(dev, clk);
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/* Take UFS slave device out of reset */
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reg |= TI_UFS_SS_RST_N_PCS;
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writel(reg, regbase + TI_UFS_SS_CTRL);
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ret = of_platform_populate(pdev->dev.of_node, NULL, NULL,
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dev);
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if (ret) {
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dev_err(dev, "failed to populate child nodes %d\n", ret);
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goto clk_err;
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}
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return ret;
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clk_err:
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pm_runtime_put_sync(dev);
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disable_pm:
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pm_runtime_disable(dev);
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return ret;
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}
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static int ti_j721e_ufs_remove(struct platform_device *pdev)
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{
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of_platform_depopulate(&pdev->dev);
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pm_runtime_put_sync(&pdev->dev);
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pm_runtime_disable(&pdev->dev);
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return 0;
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}
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static const struct of_device_id ti_j721e_ufs_of_match[] = {
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{
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.compatible = "ti,j721e-ufs",
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},
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{ },
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};
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static struct platform_driver ti_j721e_ufs_driver = {
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.probe = ti_j721e_ufs_probe,
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.remove = ti_j721e_ufs_remove,
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.driver = {
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.name = "ti-j721e-ufs",
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.of_match_table = ti_j721e_ufs_of_match,
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},
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};
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module_platform_driver(ti_j721e_ufs_driver);
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MODULE_AUTHOR("Vignesh Raghavendra <vigneshr@ti.com>");
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MODULE_DESCRIPTION("TI UFS host controller glue driver");
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MODULE_LICENSE("GPL v2");
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