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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_gen_xceiv.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_gen_xceiv 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 
126 static const struct dev_pm_ops am335x_pm_ops = {
127         SET_SYSTEM_SLEEP_PM_OPS(am335x_phy_suspend, am335x_phy_resume)
128 };
129 
130 #define DEV_PM_OPS     (&am335x_pm_ops)
131 #else
132 #define DEV_PM_OPS     NULL
133 #endif
134 
135 static const struct of_device_id am335x_phy_ids[] = {
136         { .compatible = "ti,am335x-usb-phy" },
137         { }
138 };
139 MODULE_DEVICE_TABLE(of, am335x_phy_ids);
140 
141 static struct platform_driver am335x_phy_driver = {
142         .probe          = am335x_phy_probe,
143         .remove         = am335x_phy_remove,
144         .driver         = {
145                 .name   = "am335x-phy-driver",
146                 .owner  = THIS_MODULE,
147                 .pm = DEV_PM_OPS,
148                 .of_match_table = am335x_phy_ids,
149         },
150 };
151 
152 module_platform_driver(am335x_phy_driver);
153 MODULE_LICENSE("GPL v2");
154 

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