1 // SPDX-License-Identifier: GPL-2.0 2 #include <linux/module.h> 3 #include <linux/platform_device.h> 4 #include <linux/dma-mapping.h> 5 #include <linux/usb/otg.h> 6 #include <linux/usb/usb_phy_generic.h> 7 #include <linux/slab.h> 8 #include <linux/clk.h> 9 #include <linux/of.h> 10 #include <linux/of_address.h> 11 #include <linux/usb/of.h> 12 13 #include "phy-am335x-control.h" 14 #include "phy-generic.h" 15 16 struct am335x_phy { 17 struct usb_phy_generic usb_phy_gen; 18 struct phy_control *phy_ctrl; 19 int id; 20 enum usb_dr_mode dr_mode; 21 }; 22 23 static int am335x_init(struct usb_phy *phy) 24 { 25 struct am335x_phy *am_phy = dev_get_drvdata(phy->dev); 26 27 phy_ctrl_power(am_phy->phy_ctrl, am_phy->id, am_phy->dr_mode, true); 28 return 0; 29 } 30 31 static void am335x_shutdown(struct usb_phy *phy) 32 { 33 struct am335x_phy *am_phy = dev_get_drvdata(phy->dev); 34 35 phy_ctrl_power(am_phy->phy_ctrl, am_phy->id, am_phy->dr_mode, false); 36 } 37 38 static int am335x_phy_probe(struct platform_device *pdev) 39 { 40 struct am335x_phy *am_phy; 41 struct device *dev = &pdev->dev; 42 int ret; 43 44 am_phy = devm_kzalloc(dev, sizeof(*am_phy), GFP_KERNEL); 45 if (!am_phy) 46 return -ENOMEM; 47 48 am_phy->phy_ctrl = am335x_get_phy_control(dev); 49 if (!am_phy->phy_ctrl) 50 return -EPROBE_DEFER; 51 52 am_phy->id = of_alias_get_id(pdev->dev.of_node, "phy"); 53 if (am_phy->id < 0) { 54 dev_err(&pdev->dev, "Missing PHY id: %d\n", am_phy->id); 55 return am_phy->id; 56 } 57 58 am_phy->dr_mode = of_usb_get_dr_mode_by_phy(pdev->dev.of_node, -1); 59 60 ret = usb_phy_gen_create_phy(dev, &am_phy->usb_phy_gen); 61 if (ret) 62 return ret; 63 64 am_phy->usb_phy_gen.phy.init = am335x_init; 65 am_phy->usb_phy_gen.phy.shutdown = am335x_shutdown; 66 67 platform_set_drvdata(pdev, am_phy); 68 device_init_wakeup(dev, true); 69 70 /* 71 * If we leave PHY wakeup enabled then AM33XX wakes up 72 * immediately from DS0. To avoid this we mark dev->power.can_wakeup 73 * to false. The same is checked in suspend routine to decide 74 * on whether to enable PHY wakeup or not. 75 * PHY wakeup works fine in standby mode, there by allowing us to 76 * handle remote wakeup, wakeup on disconnect and connect. 77 */ 78 79 device_set_wakeup_enable(dev, false); 80 phy_ctrl_power(am_phy->phy_ctrl, am_phy->id, am_phy->dr_mode, false); 81 82 return usb_add_phy_dev(&am_phy->usb_phy_gen.phy); 83 } 84 85 static int am335x_phy_remove(struct platform_device *pdev) 86 { 87 struct am335x_phy *am_phy = platform_get_drvdata(pdev); 88 89 usb_remove_phy(&am_phy->usb_phy_gen.phy); 90 return 0; 91 } 92 93 #ifdef CONFIG_PM_SLEEP 94 static int am335x_phy_suspend(struct device *dev) 95 { 96 struct am335x_phy *am_phy = dev_get_drvdata(dev); 97 98 /* 99 * Enable phy wakeup only if dev->power.can_wakeup is true. 100 * Make sure to enable wakeup to support remote wakeup in 101 * standby mode ( same is not supported in OFF(DS0) mode). 102 * Enable it by doing 103 * echo enabled > /sys/bus/platform/devices/<usb-phy-id>/power/wakeup 104 */ 105 106 if (device_may_wakeup(dev)) 107 phy_ctrl_wkup(am_phy->phy_ctrl, am_phy->id, true); 108 109 phy_ctrl_power(am_phy->phy_ctrl, am_phy->id, am_phy->dr_mode, false); 110 111 return 0; 112 } 113 114 static int am335x_phy_resume(struct device *dev) 115 { 116 struct am335x_phy *am_phy = dev_get_drvdata(dev); 117 118 phy_ctrl_power(am_phy->phy_ctrl, am_phy->id, am_phy->dr_mode, true); 119 120 if (device_may_wakeup(dev)) 121 phy_ctrl_wkup(am_phy->phy_ctrl, am_phy->id, false); 122 123 return 0; 124 } 125 #endif 126 127 static SIMPLE_DEV_PM_OPS(am335x_pm_ops, am335x_phy_suspend, am335x_phy_resume); 128 129 static const struct of_device_id am335x_phy_ids[] = { 130 { .compatible = "ti,am335x-usb-phy" }, 131 { } 132 }; 133 MODULE_DEVICE_TABLE(of, am335x_phy_ids); 134 135 static struct platform_driver am335x_phy_driver = { 136 .probe = am335x_phy_probe, 137 .remove = am335x_phy_remove, 138 .driver = { 139 .name = "am335x-phy-driver", 140 .pm = &am335x_pm_ops, 141 .of_match_table = am335x_phy_ids, 142 }, 143 }; 144 145 module_platform_driver(am335x_phy_driver); 146 MODULE_LICENSE("GPL v2"); 147