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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/regulator/consumer.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);
 59 
 60         ret = usb_phy_gen_create_phy(dev, &am_phy->usb_phy_gen, NULL);
 61         if (ret)
 62                 return ret;
 63 
 64         ret = usb_add_phy_dev(&am_phy->usb_phy_gen.phy);
 65         if (ret)
 66                 return ret;
 67         am_phy->usb_phy_gen.phy.init = am335x_init;
 68         am_phy->usb_phy_gen.phy.shutdown = am335x_shutdown;
 69 
 70         platform_set_drvdata(pdev, am_phy);
 71         device_init_wakeup(dev, true);
 72 
 73         /*
 74          * If we leave PHY wakeup enabled then AM33XX wakes up
 75          * immediately from DS0. To avoid this we mark dev->power.can_wakeup
 76          * to false. The same is checked in suspend routine to decide
 77          * on whether to enable PHY wakeup or not.
 78          * PHY wakeup works fine in standby mode, there by allowing us to
 79          * handle remote wakeup, wakeup on disconnect and connect.
 80          */
 81 
 82         device_set_wakeup_enable(dev, false);
 83         phy_ctrl_power(am_phy->phy_ctrl, am_phy->id, am_phy->dr_mode, false);
 84 
 85         return 0;
 86 }
 87 
 88 static int am335x_phy_remove(struct platform_device *pdev)
 89 {
 90         struct am335x_phy *am_phy = platform_get_drvdata(pdev);
 91 
 92         usb_remove_phy(&am_phy->usb_phy_gen.phy);
 93         return 0;
 94 }
 95 
 96 #ifdef CONFIG_PM_SLEEP
 97 static int am335x_phy_suspend(struct device *dev)
 98 {
 99         struct platform_device  *pdev = to_platform_device(dev);
100         struct am335x_phy *am_phy = platform_get_drvdata(pdev);
101 
102         /*
103          * Enable phy wakeup only if dev->power.can_wakeup is true.
104          * Make sure to enable wakeup to support remote wakeup  in
105          * standby mode ( same is not supported in OFF(DS0) mode).
106          * Enable it by doing
107          * echo enabled > /sys/bus/platform/devices/<usb-phy-id>/power/wakeup
108          */
109 
110         if (device_may_wakeup(dev))
111                 phy_ctrl_wkup(am_phy->phy_ctrl, am_phy->id, true);
112 
113         phy_ctrl_power(am_phy->phy_ctrl, am_phy->id, am_phy->dr_mode, false);
114 
115         return 0;
116 }
117 
118 static int am335x_phy_resume(struct device *dev)
119 {
120         struct platform_device  *pdev = to_platform_device(dev);
121         struct am335x_phy       *am_phy = platform_get_drvdata(pdev);
122 
123         phy_ctrl_power(am_phy->phy_ctrl, am_phy->id, am_phy->dr_mode, true);
124 
125         if (device_may_wakeup(dev))
126                 phy_ctrl_wkup(am_phy->phy_ctrl, am_phy->id, false);
127 
128         return 0;
129 }
130 #endif
131 
132 static SIMPLE_DEV_PM_OPS(am335x_pm_ops, am335x_phy_suspend, am335x_phy_resume);
133 
134 static const struct of_device_id am335x_phy_ids[] = {
135         { .compatible = "ti,am335x-usb-phy" },
136         { }
137 };
138 MODULE_DEVICE_TABLE(of, am335x_phy_ids);
139 
140 static struct platform_driver am335x_phy_driver = {
141         .probe          = am335x_phy_probe,
142         .remove         = am335x_phy_remove,
143         .driver         = {
144                 .name   = "am335x-phy-driver",
145                 .pm = &am335x_pm_ops,
146                 .of_match_table = am335x_phy_ids,
147         },
148 };
149 
150 module_platform_driver(am335x_phy_driver);
151 MODULE_LICENSE("GPL v2");
152 

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