1 // SPDX-License-Identifier: GPL-2.0+ 2 /* 3 * Copyright (C) 2020 Lubomir Rintel <lkundrak@v3.sk> 4 */ 5 6 #include <linux/delay.h> 7 #include <linux/io.h> 8 #include <linux/module.h> 9 #include <linux/phy/phy.h> 10 #include <linux/platform_device.h> 11 12 #define HSIC_CTRL 0x08 13 #define HSIC_ENABLE BIT(7) 14 #define PLL_BYPASS BIT(4) 15 16 static int mmp3_hsic_phy_init(struct phy *phy) 17 { 18 void __iomem *base = (void __iomem *)phy_get_drvdata(phy); 19 u32 hsic_ctrl; 20 21 hsic_ctrl = readl_relaxed(base + HSIC_CTRL); 22 hsic_ctrl |= HSIC_ENABLE; 23 hsic_ctrl |= PLL_BYPASS; 24 writel_relaxed(hsic_ctrl, base + HSIC_CTRL); 25 26 return 0; 27 } 28 29 static const struct phy_ops mmp3_hsic_phy_ops = { 30 .init = mmp3_hsic_phy_init, 31 .owner = THIS_MODULE, 32 }; 33 34 static const struct of_device_id mmp3_hsic_phy_of_match[] = { 35 { .compatible = "marvell,mmp3-hsic-phy", }, 36 { }, 37 }; 38 MODULE_DEVICE_TABLE(of, mmp3_hsic_phy_of_match); 39 40 static int mmp3_hsic_phy_probe(struct platform_device *pdev) 41 { 42 struct device *dev = &pdev->dev; 43 struct phy_provider *provider; 44 void __iomem *base; 45 struct phy *phy; 46 47 base = devm_platform_get_and_ioremap_resource(pdev, 0, NULL); 48 if (IS_ERR(base)) 49 return PTR_ERR(base); 50 51 phy = devm_phy_create(dev, NULL, &mmp3_hsic_phy_ops); 52 if (IS_ERR(phy)) { 53 dev_err(dev, "failed to create PHY\n"); 54 return PTR_ERR(phy); 55 } 56 57 phy_set_drvdata(phy, (void *)base); 58 provider = devm_of_phy_provider_register(dev, of_phy_simple_xlate); 59 if (IS_ERR(provider)) { 60 dev_err(dev, "failed to register PHY provider\n"); 61 return PTR_ERR(provider); 62 } 63 64 return 0; 65 } 66 67 static struct platform_driver mmp3_hsic_phy_driver = { 68 .probe = mmp3_hsic_phy_probe, 69 .driver = { 70 .name = "mmp3-hsic-phy", 71 .of_match_table = mmp3_hsic_phy_of_match, 72 }, 73 }; 74 module_platform_driver(mmp3_hsic_phy_driver); 75 76 MODULE_AUTHOR("Lubomir Rintel <lkundrak@v3.sk>"); 77 MODULE_DESCRIPTION("Marvell MMP3 USB HSIC PHY Driver"); 78 MODULE_LICENSE("GPL"); 79