phy/marvell/phy-mmp3-hsic.c

0001 // SPDX-License-Identifier: GPL-2.0+
0002 /*
0003  * Copyright (C) 2020 Lubomir Rintel <lkundrak@v3.sk>
0004  */
0005
0006 #include <linux/delay.h>
0007 #include <linux/io.h>
0008 #include <linux/module.h>
0009 #include <linux/phy/phy.h>
0010 #include <linux/platform_device.h>
0011
0012 #define HSIC_CTRL   0x08
0013 #define HSIC_ENABLE BIT(7)
0014 #define PLL_BYPASS  BIT(4)
0015
0016 static int mmp3_hsic_phy_init(struct phy *phy)
0017 {
0018     void __iomem *base = (void __iomem *)phy_get_drvdata(phy);
0019     u32 hsic_ctrl;
0020
0021     hsic_ctrl = readl_relaxed(base + HSIC_CTRL);
0022     hsic_ctrl |= HSIC_ENABLE;
0023     hsic_ctrl |= PLL_BYPASS;
0024     writel_relaxed(hsic_ctrl, base + HSIC_CTRL);
0025
0026     return 0;
0027 }
0028
0029 static const struct phy_ops mmp3_hsic_phy_ops = {
0030     .init       = mmp3_hsic_phy_init,
0031     .owner      = THIS_MODULE,
0032 };
0033
0034 static const struct of_device_id mmp3_hsic_phy_of_match[] = {
0035     { .compatible = "marvell,mmp3-hsic-phy", },
0036     { },
0037 };
0038 MODULE_DEVICE_TABLE(of, mmp3_hsic_phy_of_match);
0039
0040 static int mmp3_hsic_phy_probe(struct platform_device *pdev)
0041 {
0042     struct device *dev = &pdev->dev;
0043     struct phy_provider *provider;
0044     struct resource *resource;
0045     void __iomem *base;
0046     struct phy *phy;
0047
0048     resource = platform_get_resource(pdev, IORESOURCE_MEM, 0);
0049     base = devm_ioremap_resource(dev, resource);
0050     if (IS_ERR(base))
0051         return PTR_ERR(base);
0052
0053     phy = devm_phy_create(dev, NULL, &mmp3_hsic_phy_ops);
0054     if (IS_ERR(phy)) {
0055         dev_err(dev, "failed to create PHY\n");
0056         return PTR_ERR(phy);
0057     }
0058
0059     phy_set_drvdata(phy, (void *)base);
0060     provider = devm_of_phy_provider_register(dev, of_phy_simple_xlate);
0061     if (IS_ERR(provider)) {
0062         dev_err(dev, "failed to register PHY provider\n");
0063         return PTR_ERR(provider);
0064     }
0065
0066     return 0;
0067 }
0068
0069 static struct platform_driver mmp3_hsic_phy_driver = {
0070     .probe      = mmp3_hsic_phy_probe,
0071     .driver     = {
0072         .name   = "mmp3-hsic-phy",
0073         .of_match_table = mmp3_hsic_phy_of_match,
0074     },
0075 };
0076 module_platform_driver(mmp3_hsic_phy_driver);
0077
0078 MODULE_AUTHOR("Lubomir Rintel <lkundrak@v3.sk>");
0079 MODULE_DESCRIPTION("Marvell MMP3 USB HSIC PHY Driver");
0080 MODULE_LICENSE("GPL");