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/mod_devicetable.h> 9 #include <linux/module.h> 10 #include <linux/phy/phy.h> 11 #include <linux/platform_device.h> 12 13 #define HSIC_CTRL 0x08 14 #define HSIC_ENABLE BIT(7) 15 #define PLL_BYPASS BIT(4) 16 17 static int mmp3_hsic_phy_init(struct phy *phy) 18 { 19 void __iomem *base = (void __iomem *)phy_get_drvdata(phy); 20 u32 hsic_ctrl; 21 22 hsic_ctrl = readl_relaxed(base + HSIC_CTRL); 23 hsic_ctrl |= HSIC_ENABLE; 24 hsic_ctrl |= PLL_BYPASS; 25 writel_relaxed(hsic_ctrl, base + HSIC_CTRL); 26 27 return 0; 28 } 29 30 static const struct phy_ops mmp3_hsic_phy_ops = { 31 .init = mmp3_hsic_phy_init, 32 .owner = THIS_MODULE, 33 }; 34 35 static const struct of_device_id mmp3_hsic_phy_of_match[] = { 36 { .compatible = "marvell,mmp3-hsic-phy", }, 37 { }, 38 }; 39 MODULE_DEVICE_TABLE(of, mmp3_hsic_phy_of_match); 40 41 static int mmp3_hsic_phy_probe(struct platform_device *pdev) 42 { 43 struct device *dev = &pdev->dev; 44 struct phy_provider *provider; 45 void __iomem *base; 46 struct phy *phy; 47 48 base = devm_platform_get_and_ioremap_resource(pdev, 0, NULL); 49 if (IS_ERR(base)) 50 return PTR_ERR(base); 51 52 phy = devm_phy_create(dev, NULL, &mmp3_hsic_phy_ops); 53 if (IS_ERR(phy)) { 54 dev_err(dev, "failed to create PHY\n"); 55 return PTR_ERR(phy); 56 } 57 58 phy_set_drvdata(phy, (void *)base); 59 provider = devm_of_phy_provider_register(dev, of_phy_simple_xlate); 60 if (IS_ERR(provider)) { 61 dev_err(dev, "failed to register PHY provider\n"); 62 return PTR_ERR(provider); 63 } 64 65 return 0; 66 } 67 68 static struct platform_driver mmp3_hsic_phy_driver = { 69 .probe = mmp3_hsic_phy_probe, 70 .driver = { 71 .name = "mmp3-hsic-phy", 72 .of_match_table = mmp3_hsic_phy_of_match, 73 }, 74 }; 75 module_platform_driver(mmp3_hsic_phy_driver); 76 77 MODULE_AUTHOR("Lubomir Rintel <lkundrak@v3.sk>"); 78 MODULE_DESCRIPTION("Marvell MMP3 USB HSIC PHY Driver"); 79 MODULE_LICENSE("GPL"); 80