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 struct resource *resource; 45 void __iomem *base; 46 struct phy *phy; 47 48 resource = platform_get_resource(pdev, IORESOURCE_MEM, 0); 49 base = devm_ioremap_resource(dev, resource); 50 if (IS_ERR(base)) { 51 dev_err(dev, "failed to remap PHY regs\n"); 52 return PTR_ERR(base); 53 } 54 55 phy = devm_phy_create(dev, NULL, &mmp3_hsic_phy_ops); 56 if (IS_ERR(phy)) { 57 dev_err(dev, "failed to create PHY\n"); 58 return PTR_ERR(phy); 59 } 60 61 phy_set_drvdata(phy, (void *)base); 62 provider = devm_of_phy_provider_register(dev, of_phy_simple_xlate); 63 if (IS_ERR(provider)) { 64 dev_err(dev, "failed to register PHY provider\n"); 65 return PTR_ERR(provider); 66 } 67 68 return 0; 69 } 70 71 static struct platform_driver mmp3_hsic_phy_driver = { 72 .probe = mmp3_hsic_phy_probe, 73 .driver = { 74 .name = "mmp3-hsic-phy", 75 .of_match_table = mmp3_hsic_phy_of_match, 76 }, 77 }; 78 module_platform_driver(mmp3_hsic_phy_driver); 79 80 MODULE_AUTHOR("Lubomir Rintel <lkundrak@v3.sk>"); 81 MODULE_DESCRIPTION("Marvell MMP3 USB HSIC PHY Driver"); 82 MODULE_LICENSE("GPL"); 83