Adds usb-phy driver support for am33xx platform, the host/device peripheral controller shall get this phy object to control the phy operations. Signed-off-by: Ravi Babu <ravibabu@xxxxxx> --- drivers/usb/phy/Kconfig | 9 ++ drivers/usb/phy/Makefile | 1 + drivers/usb/phy/phy-dsps-usb.c | 236 ++++++++++++++++++++++++++++++++++++++++ 3 files changed, 246 insertions(+), 0 deletions(-) create mode 100644 drivers/usb/phy/phy-dsps-usb.c diff --git a/drivers/usb/phy/Kconfig b/drivers/usb/phy/Kconfig index 372db48..b55c265 100644 --- a/drivers/usb/phy/Kconfig +++ b/drivers/usb/phy/Kconfig @@ -85,6 +85,15 @@ config OMAP_USB3 This driver interacts with the "OMAP Control USB Driver" to power on/off the PHY. +config DSPS_USB2PHY + tristate "DSPS USB2 PHY Driver" + depends on SOC_AM33XX + help + Enable this to support the transceiver that is part of SOC. This + phy supports all LS/FS/HS speed and also supports OTG functionality. + The USB OTG controller communicates with this phy through stand UTMI + interface. + config SAMSUNG_USBPHY tristate "Samsung USB PHY Driver" help diff --git a/drivers/usb/phy/Makefile b/drivers/usb/phy/Makefile index 33863c0..0b16fb3 100644 --- a/drivers/usb/phy/Makefile +++ b/drivers/usb/phy/Makefile @@ -17,6 +17,7 @@ obj-$(CONFIG_NOP_USB_XCEIV) += phy-nop.o obj-$(CONFIG_OMAP_CONTROL_USB) += phy-omap-control.o obj-$(CONFIG_OMAP_USB2) += phy-omap-usb2.o obj-$(CONFIG_OMAP_USB3) += phy-omap-usb3.o +obj-$(CONFIG_DSPS_USB2PHY) += phy-dsps-usb.o obj-$(CONFIG_SAMSUNG_USBPHY) += phy-samsung-usb.o obj-$(CONFIG_SAMSUNG_USB2PHY) += phy-samsung-usb2.o obj-$(CONFIG_SAMSUNG_USB3PHY) += phy-samsung-usb3.o diff --git a/drivers/usb/phy/phy-dsps-usb.c b/drivers/usb/phy/phy-dsps-usb.c new file mode 100644 index 0000000..aae97b3 --- /dev/null +++ b/drivers/usb/phy/phy-dsps-usb.c @@ -0,0 +1,236 @@ +/* + * phy-dsps-usb.c - TI gs70 based usb phy driver used by usb controller + * + * Copyright (C) 2013 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. + * + * 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/usb/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/usb/phy.h> + +struct dsps_phy { + struct usb_phy phy; + struct device *dev; + struct platform_device *pdev; + void __iomem *phy_ctrl; + void __iomem *phy_wkup; + u8 is_suspended:1; + int id; +}; + +#define DSPS_USBPHY_CM_PWRDN (1 << 0) +#define DSPS_USBPHY_OTG_PWRDN (1 << 1) +#define DSPS_USBPHY_OTGVDET_EN (1 << 19) +#define DSPS_USBPHY_OTGSESSEND_EN (1 << 20) +#define DSPS_USB0_WKUP_CTRL_ENABLE (1 << 0) +#define DSPS_USB1_WKUP_CTRL_ENABLE (1 << 8) +#define phy_to_dspsphy(x) container_of((x), struct dsps_phy, phy) + +static void dsps_usbphy_power(struct usb_phy *phy, bool is_on) +{ + struct dsps_phy *dsps_phy = phy_to_dspsphy(phy); + u32 val; + + val = readl(dsps_phy->phy_ctrl); + + if (is_on) { + val &= ~(DSPS_USBPHY_CM_PWRDN | DSPS_USBPHY_OTG_PWRDN); + val |= DSPS_USBPHY_OTGVDET_EN | + DSPS_USBPHY_OTGSESSEND_EN; + } else + val |= DSPS_USBPHY_CM_PWRDN | DSPS_USBPHY_OTG_PWRDN; + + writel(val, dsps_phy->phy_ctrl); +} + +static void dsps_usbphy_wakeup(struct usb_phy *phy, bool enable) +{ + struct dsps_phy *dsps_phy = phy_to_dspsphy(phy); + int id = dsps_phy->id; + u32 val, wkup_flag; + + val = readl(dsps_phy->phy_wkup); + wkup_flag = id ? DSPS_USB1_WKUP_CTRL_ENABLE : + DSPS_USB0_WKUP_CTRL_ENABLE; + + if (enable) + val |= wkup_flag; + else + val &= ~wkup_flag; + + writel(val, dsps_phy->phy_wkup); +} + +static int dsps_usbphy_suspend(struct usb_phy *x, int suspend) +{ + struct dsps_phy *dsps_phy = phy_to_dspsphy(x); + + if (suspend) { + if (!pm_runtime_suspended(&dsps_phy->pdev->dev)) + pm_runtime_put(&dsps_phy->pdev->dev); + } else if (!suspend) + pm_runtime_get(&dsps_phy->pdev->dev); + + return 0; +} + +static int dsps_usbphy_init(struct usb_phy *phy) +{ + /* enable the phy */ + dsps_usbphy_power(phy, 1); + + return 0; +} + +static void dsps_usbphy_shutdown(struct usb_phy *phy) +{ + /* disable the phy */ + dsps_usbphy_power(phy, 0); +} + +static int dsps_usbphy_probe(struct platform_device *pdev) +{ + struct device_node *np = pdev->dev.of_node; + struct dsps_phy *phy; + struct usb_otg *otg; + struct resource *res; + + phy = devm_kzalloc(&pdev->dev, sizeof(*phy), GFP_KERNEL); + if (!phy) { + dev_err(&pdev->dev, "unable to allocate memory for USB2 PHY\n"); + return -ENOMEM; + } + + otg = devm_kzalloc(&pdev->dev, sizeof(*otg), GFP_KERNEL); + if (!otg) { + dev_err(&pdev->dev, "unable to allocate memory for USB OTG\n"); + return -ENOMEM; + } + + phy->dev = &pdev->dev; + phy->pdev = pdev; + + res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "phy_ctrl"); + phy->phy_ctrl = devm_ioremap_resource(&pdev->dev, res); + if (IS_ERR(phy->phy_ctrl)) + return PTR_ERR(phy->phy_ctrl); + + res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "phy_wkup"); + phy->phy_wkup = ioremap(res->start, resource_size(res)); + if (IS_ERR(phy->phy_wkup)) + return PTR_ERR(phy->phy_wkup); + + if (np) + of_property_read_u32(np, "id", &phy->id); + + phy->phy.dev = phy->dev; + phy->phy.label = "dsps-usbphy"; + phy->phy.otg = otg; + phy->phy.type = USB_PHY_TYPE_USB2; + phy->phy.init = dsps_usbphy_init; + phy->phy.shutdown = dsps_usbphy_shutdown; + phy->phy.set_suspend = dsps_usbphy_suspend; + otg->phy = &phy->phy; + + usb_add_phy_dev(&phy->phy); + + platform_set_drvdata(pdev, phy); + + pm_runtime_enable(phy->dev); + + return 0; +} + +static int dsps_usbphy_remove(struct platform_device *pdev) +{ + struct dsps_phy *phy = platform_get_drvdata(pdev); + + dsps_usbphy_power(&phy->phy, 0); + iounmap(phy->phy_wkup); + usb_remove_phy(&phy->phy); + + if (!pm_runtime_suspended(&pdev->dev)) + pm_runtime_put(&pdev->dev); + pm_runtime_disable(&pdev->dev); + + return 0; +} + +#ifdef CONFIG_PM_RUNTIME + +static int dsps_usbphy_runtime_suspend(struct device *dev) +{ + struct dsps_phy *dsps_phy = dev_get_drvdata(dev); + + /* suspend usb-phy */ + dsps_usbphy_power(&dsps_phy->phy, 0); + dsps_phy->is_suspended = 1; + + return 0; +} + +static int dsps_usbphy_runtime_resume(struct device *dev) +{ + struct dsps_phy *dsps_phy = dev_get_drvdata(dev); + + /* resume usb-phy */ + dsps_usbphy_power(&dsps_phy->phy, 1); + dsps_phy->is_suspended = 0; + + return 0; +} + +static const struct dev_pm_ops dsps_usbphy_pm_ops = { + SET_RUNTIME_PM_OPS(dsps_usbphy_runtime_suspend, + dsps_usbphy_runtime_resume, NULL) +}; + +#define DEV_PM_OPS (&dsps_usbphy_pm_ops) +#else +#define DEV_PM_OPS NULL +#endif + +#ifdef CONFIG_OF +static const struct of_device_id dsps_usbphy_id_table[] = { + { .compatible = "ti,dsps-usbphy" }, + {} +}; +MODULE_DEVICE_TABLE(of, dsps_usbphy_id_table); +#endif + +static struct platform_driver dsps_usbphy_driver = { + .probe = dsps_usbphy_probe, + .remove = dsps_usbphy_remove, + .driver = { + .name = "dsps-usbphy", + .owner = THIS_MODULE, + .pm = DEV_PM_OPS, + .of_match_table = of_match_ptr(dsps_usbphy_id_table), + }, +}; + +module_platform_driver(dsps_usbphy_driver); + +MODULE_ALIAS("platform: dsps_usbphy"); +MODULE_AUTHOR("Ravi Babu <ravibabu@xxxxxx>"); +MODULE_DESCRIPTION("dsps USB2 phy driver"); +MODULE_LICENSE("GPL v2"); -- 1.7.0.4 -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
