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146 lines
3.7 KiB
146 lines
3.7 KiB
// SPDX-License-Identifier: GPL-2.0 |
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#include <linux/module.h> |
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#include <linux/platform_device.h> |
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#include <linux/dma-mapping.h> |
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#include <linux/usb/otg.h> |
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#include <linux/usb/usb_phy_generic.h> |
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#include <linux/slab.h> |
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#include <linux/clk.h> |
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#include <linux/of.h> |
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#include <linux/of_address.h> |
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#include <linux/usb/of.h> |
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#include "phy-am335x-control.h" |
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#include "phy-generic.h" |
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struct am335x_phy { |
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struct usb_phy_generic usb_phy_gen; |
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struct phy_control *phy_ctrl; |
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int id; |
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enum usb_dr_mode dr_mode; |
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}; |
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static int am335x_init(struct usb_phy *phy) |
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{ |
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struct am335x_phy *am_phy = dev_get_drvdata(phy->dev); |
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phy_ctrl_power(am_phy->phy_ctrl, am_phy->id, am_phy->dr_mode, true); |
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return 0; |
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} |
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static void am335x_shutdown(struct usb_phy *phy) |
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{ |
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struct am335x_phy *am_phy = dev_get_drvdata(phy->dev); |
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phy_ctrl_power(am_phy->phy_ctrl, am_phy->id, am_phy->dr_mode, false); |
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} |
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static int am335x_phy_probe(struct platform_device *pdev) |
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{ |
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struct am335x_phy *am_phy; |
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struct device *dev = &pdev->dev; |
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int ret; |
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am_phy = devm_kzalloc(dev, sizeof(*am_phy), GFP_KERNEL); |
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if (!am_phy) |
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return -ENOMEM; |
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am_phy->phy_ctrl = am335x_get_phy_control(dev); |
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if (!am_phy->phy_ctrl) |
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return -EPROBE_DEFER; |
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am_phy->id = of_alias_get_id(pdev->dev.of_node, "phy"); |
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if (am_phy->id < 0) { |
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dev_err(&pdev->dev, "Missing PHY id: %d\n", am_phy->id); |
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return am_phy->id; |
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} |
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am_phy->dr_mode = of_usb_get_dr_mode_by_phy(pdev->dev.of_node, -1); |
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ret = usb_phy_gen_create_phy(dev, &am_phy->usb_phy_gen); |
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if (ret) |
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return ret; |
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am_phy->usb_phy_gen.phy.init = am335x_init; |
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am_phy->usb_phy_gen.phy.shutdown = am335x_shutdown; |
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platform_set_drvdata(pdev, am_phy); |
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device_init_wakeup(dev, true); |
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/* |
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* If we leave PHY wakeup enabled then AM33XX wakes up |
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* immediately from DS0. To avoid this we mark dev->power.can_wakeup |
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* to false. The same is checked in suspend routine to decide |
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* on whether to enable PHY wakeup or not. |
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* PHY wakeup works fine in standby mode, there by allowing us to |
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* handle remote wakeup, wakeup on disconnect and connect. |
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*/ |
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device_set_wakeup_enable(dev, false); |
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phy_ctrl_power(am_phy->phy_ctrl, am_phy->id, am_phy->dr_mode, false); |
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return usb_add_phy_dev(&am_phy->usb_phy_gen.phy); |
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} |
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static int am335x_phy_remove(struct platform_device *pdev) |
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{ |
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struct am335x_phy *am_phy = platform_get_drvdata(pdev); |
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usb_remove_phy(&am_phy->usb_phy_gen.phy); |
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return 0; |
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} |
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#ifdef CONFIG_PM_SLEEP |
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static int am335x_phy_suspend(struct device *dev) |
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{ |
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struct am335x_phy *am_phy = dev_get_drvdata(dev); |
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/* |
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* Enable phy wakeup only if dev->power.can_wakeup is true. |
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* Make sure to enable wakeup to support remote wakeup in |
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* standby mode ( same is not supported in OFF(DS0) mode). |
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* Enable it by doing |
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* echo enabled > /sys/bus/platform/devices/<usb-phy-id>/power/wakeup |
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*/ |
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if (device_may_wakeup(dev)) |
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phy_ctrl_wkup(am_phy->phy_ctrl, am_phy->id, true); |
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phy_ctrl_power(am_phy->phy_ctrl, am_phy->id, am_phy->dr_mode, false); |
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return 0; |
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} |
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static int am335x_phy_resume(struct device *dev) |
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{ |
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struct am335x_phy *am_phy = dev_get_drvdata(dev); |
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phy_ctrl_power(am_phy->phy_ctrl, am_phy->id, am_phy->dr_mode, true); |
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if (device_may_wakeup(dev)) |
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phy_ctrl_wkup(am_phy->phy_ctrl, am_phy->id, false); |
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return 0; |
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} |
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#endif |
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static SIMPLE_DEV_PM_OPS(am335x_pm_ops, am335x_phy_suspend, am335x_phy_resume); |
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static const struct of_device_id am335x_phy_ids[] = { |
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{ .compatible = "ti,am335x-usb-phy" }, |
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{ } |
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}; |
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MODULE_DEVICE_TABLE(of, am335x_phy_ids); |
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static struct platform_driver am335x_phy_driver = { |
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.probe = am335x_phy_probe, |
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.remove = am335x_phy_remove, |
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.driver = { |
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.name = "am335x-phy-driver", |
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.pm = &am335x_pm_ops, |
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.of_match_table = am335x_phy_ids, |
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}, |
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}; |
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module_platform_driver(am335x_phy_driver); |
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MODULE_LICENSE("GPL v2");
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