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/regulator/consumer.h> 9 #include <linux/of.h> 10 #include <linux/of_address.h> 11 12 #include "am35x-phy-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 }; 20 21 static int am335x_init(struct usb_phy *phy) 22 { 23 struct am335x_phy *am_phy = dev_get_drvdata(phy->dev); 24 25 phy_ctrl_power(am_phy->phy_ctrl, am_phy->id, true); 26 return 0; 27 } 28 29 static void am335x_shutdown(struct usb_phy *phy) 30 { 31 struct am335x_phy *am_phy = dev_get_drvdata(phy->dev); 32 33 phy_ctrl_power(am_phy->phy_ctrl, am_phy->id, false); 34 } 35 36 static int am335x_phy_probe(struct platform_device *pdev) 37 { 38 struct am335x_phy *am_phy; 39 struct device *dev = &pdev->dev; 40 int ret; 41 42 am_phy = devm_kzalloc(dev, sizeof(*am_phy), GFP_KERNEL); 43 if (!am_phy) 44 return -ENOMEM; 45 46 am_phy->phy_ctrl = am335x_get_phy_control(dev); 47 if (!am_phy->phy_ctrl) 48 return -EPROBE_DEFER; 49 am_phy->id = of_alias_get_id(pdev->dev.of_node, "phy"); 50 if (am_phy->id < 0) { 51 dev_err(&pdev->dev, "Missing PHY id: %d\n", am_phy->id); 52 return am_phy->id; 53 } 54 55 ret = usb_phy_gen_create_phy(dev, &am_phy->usb_phy_gen, NULL); 56 if (ret) 57 return ret; 58 59 ret = usb_add_phy_dev(&am_phy->usb_phy_gen.phy); 60 if (ret) 61 return ret; 62 am_phy->usb_phy_gen.phy.init = am335x_init; 63 am_phy->usb_phy_gen.phy.shutdown = am335x_shutdown; 64 65 platform_set_drvdata(pdev, am_phy); 66 device_init_wakeup(dev, true); 67 68 /* 69 * If we leave PHY wakeup enabled then AM33XX wakes up 70 * immediately from DS0. To avoid this we mark dev->power.can_wakeup 71 * to false. The same is checked in suspend routine to decide 72 * on whether to enable PHY wakeup or not. 73 * PHY wakeup works fine in standby mode, there by allowing us to 74 * handle remote wakeup, wakeup on disconnect and connect. 75 */ 76 77 device_set_wakeup_enable(dev, false); 78 phy_ctrl_power(am_phy->phy_ctrl, am_phy->id, false); 79 80 return 0; 81 } 82 83 static int am335x_phy_remove(struct platform_device *pdev) 84 { 85 struct am335x_phy *am_phy = platform_get_drvdata(pdev); 86 87 usb_remove_phy(&am_phy->usb_phy_gen.phy); 88 return 0; 89 } 90 91 #ifdef CONFIG_PM_SLEEP 92 static int am335x_phy_suspend(struct device *dev) 93 { 94 struct platform_device *pdev = to_platform_device(dev); 95 struct am335x_phy *am_phy = platform_get_drvdata(pdev); 96 97 /* 98 * Enable phy wakeup only if dev->power.can_wakeup is true. 99 * Make sure to enable wakeup to support remote wakeup in 100 * standby mode ( same is not supported in OFF(DS0) mode). 101 * Enable it by doing 102 * echo enabled > /sys/bus/platform/devices/<usb-phy-id>/power/wakeup 103 */ 104 105 if (device_may_wakeup(dev)) 106 phy_ctrl_wkup(am_phy->phy_ctrl, am_phy->id, true); 107 108 phy_ctrl_power(am_phy->phy_ctrl, am_phy->id, false); 109 110 return 0; 111 } 112 113 static int am335x_phy_resume(struct device *dev) 114 { 115 struct platform_device *pdev = to_platform_device(dev); 116 struct am335x_phy *am_phy = platform_get_drvdata(pdev); 117 118 phy_ctrl_power(am_phy->phy_ctrl, am_phy->id, 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 .owner = THIS_MODULE, 141 .pm = &am335x_pm_ops, 142 .of_match_table = am335x_phy_ids, 143 }, 144 }; 145 146 module_platform_driver(am335x_phy_driver); 147 MODULE_LICENSE("GPL v2"); 148