1 #include <linux/module.h> 2 #include <linux/platform_device.h> 3 #include <linux/dma-mapping.h> 4 #include <linux/usb/otg.h> 5 #include <linux/usb/usb_phy_generic.h> 6 #include <linux/slab.h> 7 #include <linux/clk.h> 8 #include <linux/of.h> 9 #include <linux/of_address.h> 10 #include <linux/usb/of.h> 11 12 #include "phy-am335x-control.h" 13 #include "phy-generic.h" 14 15 struct am335x_phy { 16 struct usb_phy_generic usb_phy_gen; 17 struct phy_control *phy_ctrl; 18 int id; 19 enum usb_dr_mode dr_mode; 20 }; 21 22 static int am335x_init(struct usb_phy *phy) 23 { 24 struct am335x_phy *am_phy = dev_get_drvdata(phy->dev); 25 26 phy_ctrl_power(am_phy->phy_ctrl, am_phy->id, am_phy->dr_mode, true); 27 return 0; 28 } 29 30 static void am335x_shutdown(struct usb_phy *phy) 31 { 32 struct am335x_phy *am_phy = dev_get_drvdata(phy->dev); 33 34 phy_ctrl_power(am_phy->phy_ctrl, am_phy->id, am_phy->dr_mode, false); 35 } 36 37 static int am335x_phy_probe(struct platform_device *pdev) 38 { 39 struct am335x_phy *am_phy; 40 struct device *dev = &pdev->dev; 41 int ret; 42 43 am_phy = devm_kzalloc(dev, sizeof(*am_phy), GFP_KERNEL); 44 if (!am_phy) 45 return -ENOMEM; 46 47 am_phy->phy_ctrl = am335x_get_phy_control(dev); 48 if (!am_phy->phy_ctrl) 49 return -EPROBE_DEFER; 50 51 am_phy->id = of_alias_get_id(pdev->dev.of_node, "phy"); 52 if (am_phy->id < 0) { 53 dev_err(&pdev->dev, "Missing PHY id: %d\n", am_phy->id); 54 return am_phy->id; 55 } 56 57 am_phy->dr_mode = of_usb_get_dr_mode_by_phy(pdev->dev.of_node, -1); 58 59 ret = usb_phy_gen_create_phy(dev, &am_phy->usb_phy_gen, NULL); 60 if (ret) 61 return ret; 62 63 ret = usb_add_phy_dev(&am_phy->usb_phy_gen.phy); 64 if (ret) 65 return ret; 66 am_phy->usb_phy_gen.phy.init = am335x_init; 67 am_phy->usb_phy_gen.phy.shutdown = am335x_shutdown; 68 69 platform_set_drvdata(pdev, am_phy); 70 device_init_wakeup(dev, true); 71 72 /* 73 * If we leave PHY wakeup enabled then AM33XX wakes up 74 * immediately from DS0. To avoid this we mark dev->power.can_wakeup 75 * to false. The same is checked in suspend routine to decide 76 * on whether to enable PHY wakeup or not. 77 * PHY wakeup works fine in standby mode, there by allowing us to 78 * handle remote wakeup, wakeup on disconnect and connect. 79 */ 80 81 device_set_wakeup_enable(dev, false); 82 phy_ctrl_power(am_phy->phy_ctrl, am_phy->id, am_phy->dr_mode, false); 83 84 return 0; 85 } 86 87 static int am335x_phy_remove(struct platform_device *pdev) 88 { 89 struct am335x_phy *am_phy = platform_get_drvdata(pdev); 90 91 usb_remove_phy(&am_phy->usb_phy_gen.phy); 92 return 0; 93 } 94 95 #ifdef CONFIG_PM_SLEEP 96 static int am335x_phy_suspend(struct device *dev) 97 { 98 struct platform_device *pdev = to_platform_device(dev); 99 struct am335x_phy *am_phy = platform_get_drvdata(pdev); 100 101 /* 102 * Enable phy wakeup only if dev->power.can_wakeup is true. 103 * Make sure to enable wakeup to support remote wakeup in 104 * standby mode ( same is not supported in OFF(DS0) mode). 105 * Enable it by doing 106 * echo enabled > /sys/bus/platform/devices/<usb-phy-id>/power/wakeup 107 */ 108 109 if (device_may_wakeup(dev)) 110 phy_ctrl_wkup(am_phy->phy_ctrl, am_phy->id, true); 111 112 phy_ctrl_power(am_phy->phy_ctrl, am_phy->id, am_phy->dr_mode, false); 113 114 return 0; 115 } 116 117 static int am335x_phy_resume(struct device *dev) 118 { 119 struct platform_device *pdev = to_platform_device(dev); 120 struct am335x_phy *am_phy = platform_get_drvdata(pdev); 121 122 phy_ctrl_power(am_phy->phy_ctrl, am_phy->id, am_phy->dr_mode, true); 123 124 if (device_may_wakeup(dev)) 125 phy_ctrl_wkup(am_phy->phy_ctrl, am_phy->id, false); 126 127 return 0; 128 } 129 #endif 130 131 static SIMPLE_DEV_PM_OPS(am335x_pm_ops, am335x_phy_suspend, am335x_phy_resume); 132 133 static const struct of_device_id am335x_phy_ids[] = { 134 { .compatible = "ti,am335x-usb-phy" }, 135 { } 136 }; 137 MODULE_DEVICE_TABLE(of, am335x_phy_ids); 138 139 static struct platform_driver am335x_phy_driver = { 140 .probe = am335x_phy_probe, 141 .remove = am335x_phy_remove, 142 .driver = { 143 .name = "am335x-phy-driver", 144 .pm = &am335x_pm_ops, 145 .of_match_table = am335x_phy_ids, 146 }, 147 }; 148 149 module_platform_driver(am335x_phy_driver); 150 MODULE_LICENSE("GPL v2"); 151