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Linux/drivers/usb/phy/phy-am335x.c

  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 

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