/* * omap-usb2.c - USB PHY, talking to musb controller in OMAP. * * Copyright (C) 2012 Texas Instruments Incorporated - http://www.ti.com * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2 of the License, or * (at your option) any later version. * * Author: Kishon Vijay Abraham I <kishon@ti.com> * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * */ #include <linux/module.h> #include <linux/platform_device.h> #include <linux/slab.h> #include <linux/of.h> #include <linux/io.h> #include <linux/phy/omap_usb.h> #include <linux/usb/phy_companion.h> #include <linux/clk.h> #include <linux/err.h> #include <linux/pm_runtime.h> #include <linux/delay.h> #include <linux/phy/omap_control_phy.h> #include <linux/phy/phy.h> #include <linux/of_platform.h> #define USB2PHY_DISCON_BYP_LATCH (1 << 31) #define USB2PHY_ANA_CONFIG1 0x4c /** * omap_usb2_set_comparator - links the comparator present in the sytem with * this phy * @comparator - the companion phy(comparator) for this phy * * The phy companion driver should call this API passing the phy_companion * filled with set_vbus and start_srp to be used by usb phy. * * For use by phy companion driver */ int omap_usb2_set_comparator(struct phy_companion *comparator) { struct omap_usb *phy; struct usb_phy *x = usb_get_phy(USB_PHY_TYPE_USB2); if (IS_ERR(x)) return -ENODEV; phy = phy_to_omapusb(x); phy->comparator = comparator; return 0; } EXPORT_SYMBOL_GPL(omap_usb2_set_comparator); static int omap_usb_set_vbus(struct usb_otg *otg, bool enabled) { struct omap_usb *phy = phy_to_omapusb(otg->usb_phy); if (!phy->comparator) return -ENODEV; return phy->comparator->set_vbus(phy->comparator, enabled); } static int omap_usb_start_srp(struct usb_otg *otg) { struct omap_usb *phy = phy_to_omapusb(otg->usb_phy); if (!phy->comparator) return -ENODEV; return phy->comparator->start_srp(phy->comparator); } static int omap_usb_set_host(struct usb_otg *otg, struct usb_bus *host) { otg->host = host; if (!host) otg->state = OTG_STATE_UNDEFINED; return 0; } static int omap_usb_set_peripheral(struct usb_otg *otg, struct usb_gadget *gadget) { otg->gadget = gadget; if (!gadget) otg->state = OTG_STATE_UNDEFINED; return 0; } static int omap_usb_power_off(struct phy *x) { struct omap_usb *phy = phy_get_drvdata(x); omap_control_phy_power(phy->control_dev, 0); return 0; } static int omap_usb_power_on(struct phy *x) { struct omap_usb *phy = phy_get_drvdata(x); omap_control_phy_power(phy->control_dev, 1); return 0; } static int omap_usb_init(struct phy *x) { struct omap_usb *phy = phy_get_drvdata(x); u32 val; if (phy->flags & OMAP_USB2_CALIBRATE_FALSE_DISCONNECT) { /* * * Reduce the sensitivity of internal PHY by enabling the * DISCON_BYP_LATCH of the USB2PHY_ANA_CONFIG1 register. This * resolves issues with certain devices which can otherwise * be prone to false disconnects. * */ val = omap_usb_readl(phy->phy_base, USB2PHY_ANA_CONFIG1); val |= USB2PHY_DISCON_BYP_LATCH; omap_usb_writel(phy->phy_base, USB2PHY_ANA_CONFIG1, val); } return 0; } static struct phy_ops ops = { .init = omap_usb_init, .power_on = omap_usb_power_on, .power_off = omap_usb_power_off, .owner = THIS_MODULE, }; #ifdef CONFIG_OF static const struct usb_phy_data omap_usb2_data = { .label = "omap_usb2", .flags = OMAP_USB2_HAS_START_SRP | OMAP_USB2_HAS_SET_VBUS, }; static const struct usb_phy_data omap5_usb2_data = { .label = "omap5_usb2", .flags = 0, }; static const struct usb_phy_data dra7x_usb2_data = { .label = "dra7x_usb2", .flags = OMAP_USB2_CALIBRATE_FALSE_DISCONNECT, }; static const struct usb_phy_data am437x_usb2_data = { .label = "am437x_usb2", .flags = 0, }; static const struct of_device_id omap_usb2_id_table[] = { { .compatible = "ti,omap-usb2", .data = &omap_usb2_data, }, { .compatible = "ti,omap5-usb2", .data = &omap5_usb2_data, }, { .compatible = "ti,dra7x-usb2", .data = &dra7x_usb2_data, }, { .compatible = "ti,am437x-usb2", .data = &am437x_usb2_data, }, {}, }; MODULE_DEVICE_TABLE(of, omap_usb2_id_table); #endif static int omap_usb2_probe(struct platform_device *pdev) { struct omap_usb *phy; struct phy *generic_phy; struct resource *res; struct phy_provider *phy_provider; struct usb_otg *otg; struct device_node *node = pdev->dev.of_node; struct device_node *control_node; struct platform_device *control_pdev; const struct of_device_id *of_id; struct usb_phy_data *phy_data; of_id = of_match_device(of_match_ptr(omap_usb2_id_table), &pdev->dev); if (!of_id) return -EINVAL; phy_data = (struct usb_phy_data *)of_id->data; phy = devm_kzalloc(&pdev->dev, sizeof(*phy), GFP_KERNEL); if (!phy) return -ENOMEM; otg = devm_kzalloc(&pdev->dev, sizeof(*otg), GFP_KERNEL); if (!otg) return -ENOMEM; phy->dev = &pdev->dev; phy->phy.dev = phy->dev; phy->phy.label = phy_data->label; phy->phy.otg = otg; phy->phy.type = USB_PHY_TYPE_USB2; if (phy_data->flags & OMAP_USB2_CALIBRATE_FALSE_DISCONNECT) { res = platform_get_resource(pdev, IORESOURCE_MEM, 0); phy->phy_base = devm_ioremap_resource(&pdev->dev, res); if (IS_ERR(phy->phy_base)) return PTR_ERR(phy->phy_base); phy->flags |= OMAP_USB2_CALIBRATE_FALSE_DISCONNECT; } control_node = of_parse_phandle(node, "ctrl-module", 0); if (!control_node) { dev_err(&pdev->dev, "Failed to get control device phandle\n"); return -EINVAL; } control_pdev = of_find_device_by_node(control_node); if (!control_pdev) { dev_err(&pdev->dev, "Failed to get control device\n"); return -EINVAL; } phy->control_dev = &control_pdev->dev; omap_control_phy_power(phy->control_dev, 0); otg->set_host = omap_usb_set_host; otg->set_peripheral = omap_usb_set_peripheral; if (phy_data->flags & OMAP_USB2_HAS_SET_VBUS) otg->set_vbus = omap_usb_set_vbus; if (phy_data->flags & OMAP_USB2_HAS_START_SRP) otg->start_srp = omap_usb_start_srp; otg->usb_phy = &phy->phy; platform_set_drvdata(pdev, phy); pm_runtime_enable(phy->dev); generic_phy = devm_phy_create(phy->dev, NULL, &ops); if (IS_ERR(generic_phy)) { pm_runtime_disable(phy->dev); return PTR_ERR(generic_phy); } phy_set_drvdata(generic_phy, phy); phy_provider = devm_of_phy_provider_register(phy->dev, of_phy_simple_xlate); if (IS_ERR(phy_provider)) { pm_runtime_disable(phy->dev); return PTR_ERR(phy_provider); } phy->wkupclk = devm_clk_get(phy->dev, "wkupclk"); if (IS_ERR(phy->wkupclk)) { dev_warn(&pdev->dev, "unable to get wkupclk, trying old name\n"); phy->wkupclk = devm_clk_get(phy->dev, "usb_phy_cm_clk32k"); if (IS_ERR(phy->wkupclk)) { dev_err(&pdev->dev, "unable to get usb_phy_cm_clk32k\n"); return PTR_ERR(phy->wkupclk); } else { dev_warn(&pdev->dev, "found usb_phy_cm_clk32k, please fix DTS\n"); } } clk_prepare(phy->wkupclk); phy->optclk = devm_clk_get(phy->dev, "refclk"); if (IS_ERR(phy->optclk)) { dev_dbg(&pdev->dev, "unable to get refclk, trying old name\n"); phy->optclk = devm_clk_get(phy->dev, "usb_otg_ss_refclk960m"); if (IS_ERR(phy->optclk)) { dev_dbg(&pdev->dev, "unable to get usb_otg_ss_refclk960m\n"); } else { dev_warn(&pdev->dev, "found usb_otg_ss_refclk960m, please fix DTS\n"); } } else { clk_prepare(phy->optclk); } usb_add_phy_dev(&phy->phy); return 0; } static int omap_usb2_remove(struct platform_device *pdev) { struct omap_usb *phy = platform_get_drvdata(pdev); clk_unprepare(phy->wkupclk); if (!IS_ERR(phy->optclk)) clk_unprepare(phy->optclk); usb_remove_phy(&phy->phy); pm_runtime_disable(phy->dev); return 0; } #ifdef CONFIG_PM static int omap_usb2_runtime_suspend(struct device *dev) { struct platform_device *pdev = to_platform_device(dev); struct omap_usb *phy = platform_get_drvdata(pdev); clk_disable(phy->wkupclk); if (!IS_ERR(phy->optclk)) clk_disable(phy->optclk); return 0; } static int omap_usb2_runtime_resume(struct device *dev) { struct platform_device *pdev = to_platform_device(dev); struct omap_usb *phy = platform_get_drvdata(pdev); int ret; ret = clk_enable(phy->wkupclk); if (ret < 0) { dev_err(phy->dev, "Failed to enable wkupclk %d\n", ret); goto err0; } if (!IS_ERR(phy->optclk)) { ret = clk_enable(phy->optclk); if (ret < 0) { dev_err(phy->dev, "Failed to enable optclk %d\n", ret); goto err1; } } return 0; err1: clk_disable(phy->wkupclk); err0: return ret; } static const struct dev_pm_ops omap_usb2_pm_ops = { SET_RUNTIME_PM_OPS(omap_usb2_runtime_suspend, omap_usb2_runtime_resume, NULL) }; #define DEV_PM_OPS (&omap_usb2_pm_ops) #else #define DEV_PM_OPS NULL #endif static struct platform_driver omap_usb2_driver = { .probe = omap_usb2_probe, .remove = omap_usb2_remove, .driver = { .name = "omap-usb2", .pm = DEV_PM_OPS, .of_match_table = of_match_ptr(omap_usb2_id_table), }, }; module_platform_driver(omap_usb2_driver); MODULE_ALIAS("platform: omap_usb2"); MODULE_AUTHOR("Texas Instruments Inc."); MODULE_DESCRIPTION("OMAP USB2 phy driver"); MODULE_LICENSE("GPL v2");