From: Thierry Reding <treding@xxxxxxxxxx> All of these Tegra SoC generations have a ChipIdea UDC IP block that can be used for device mode communication with a host. Implement rudimentary support that doesn't allow switching between host and device modes. Tested-by: Michał Mirosław <mirq-linux@xxxxxxxxxxxx> Signed-off-by: Thierry Reding <treding@xxxxxxxxxx> [digetx@xxxxxxxxx: rebased patches and added DMA alignment quirk for Tegra20] Signed-off-by: Dmitry Osipenko <digetx@xxxxxxxxx> Acked-by: Peter Chen <peter.chen@xxxxxxx> --- drivers/usb/chipidea/Makefile | 1 + drivers/usb/chipidea/ci_hdrc_tegra.c | 155 +++++++++++++++++++++++++++++++++++ 2 files changed, 156 insertions(+) create mode 100644 drivers/usb/chipidea/ci_hdrc_tegra.c diff --git a/drivers/usb/chipidea/Makefile b/drivers/usb/chipidea/Makefile index 39fca5715ed3..ddcbddf8361a 100644 --- a/drivers/usb/chipidea/Makefile +++ b/drivers/usb/chipidea/Makefile @@ -15,3 +15,4 @@ obj-$(CONFIG_USB_CHIPIDEA) += ci_hdrc_zevio.o obj-$(CONFIG_USB_CHIPIDEA_PCI) += ci_hdrc_pci.o obj-$(CONFIG_USB_CHIPIDEA_OF) += usbmisc_imx.o ci_hdrc_imx.o +obj-$(CONFIG_USB_CHIPIDEA_OF) += ci_hdrc_tegra.o diff --git a/drivers/usb/chipidea/ci_hdrc_tegra.c b/drivers/usb/chipidea/ci_hdrc_tegra.c new file mode 100644 index 000000000000..bfcee2702d50 --- /dev/null +++ b/drivers/usb/chipidea/ci_hdrc_tegra.c @@ -0,0 +1,155 @@ +/* + * Copyright (c) 2016, NVIDIA Corporation + * + * This program is free software; you can redistribute it and/or modify it + * under the terms and conditions of the GNU General Public License, + * version 2, as published by the Free Software Foundation. + */ + +#include <linux/clk.h> +#include <linux/module.h> +#include <linux/of_device.h> +#include <linux/reset.h> + +#include <linux/usb/chipidea.h> + +#include "ci.h" + +struct tegra_udc { + struct ci_hdrc_platform_data data; + struct platform_device *dev; + + struct usb_phy *phy; + struct clk *clk; +}; + +struct tegra_udc_soc_info { + unsigned long flags; +}; + +static const struct tegra_udc_soc_info tegra20_udc_soc_info = { + .flags = CI_HDRC_REQUIRES_ALIGNED_DMA, +}; + +static const struct tegra_udc_soc_info tegra30_udc_soc_info = { + .flags = 0, +}; + +static const struct tegra_udc_soc_info tegra114_udc_soc_info = { + .flags = 0, +}; + +static const struct tegra_udc_soc_info tegra124_udc_soc_info = { + .flags = 0, +}; + +static const struct of_device_id tegra_udc_of_match[] = { + { + .compatible = "nvidia,tegra20-udc", + .data = &tegra20_udc_soc_info, + }, { + .compatible = "nvidia,tegra30-udc", + .data = &tegra30_udc_soc_info, + }, { + .compatible = "nvidia,tegra114-udc", + .data = &tegra114_udc_soc_info, + }, { + .compatible = "nvidia,tegra124-udc", + .data = &tegra124_udc_soc_info, + }, { + /* sentinel */ + } +}; +MODULE_DEVICE_TABLE(of, tegra_udc_of_match); + +static int tegra_udc_probe(struct platform_device *pdev) +{ + const struct tegra_udc_soc_info *soc; + struct tegra_udc *udc; + int err; + + udc = devm_kzalloc(&pdev->dev, sizeof(*udc), GFP_KERNEL); + if (!udc) + return -ENOMEM; + + soc = of_device_get_match_data(&pdev->dev); + if (!soc) { + dev_err(&pdev->dev, "failed to match OF data\n"); + return -EINVAL; + } + + udc->phy = devm_usb_get_phy_by_phandle(&pdev->dev, "nvidia,phy", 0); + if (IS_ERR(udc->phy)) { + err = PTR_ERR(udc->phy); + dev_err(&pdev->dev, "failed to get PHY: %d\n", err); + return err; + } + + udc->clk = devm_clk_get(&pdev->dev, NULL); + if (IS_ERR(udc->clk)) { + err = PTR_ERR(udc->clk); + dev_err(&pdev->dev, "failed to get clock: %d\n", err); + return err; + } + + err = clk_prepare_enable(udc->clk); + if (err < 0) { + dev_err(&pdev->dev, "failed to enable clock: %d\n", err); + return err; + } + + /* + * Tegra's USB PHY driver doesn't implement optional phy_init() + * hook, so we have to power on UDC controller before ChipIdea + * driver initialization kicks in. + */ + usb_phy_set_suspend(udc->phy, 0); + + /* setup and register ChipIdea HDRC device */ + udc->data.name = "tegra-udc"; + udc->data.flags = soc->flags; + udc->data.usb_phy = udc->phy; + udc->data.capoffset = DEF_CAPOFFSET; + + udc->dev = ci_hdrc_add_device(&pdev->dev, pdev->resource, + pdev->num_resources, &udc->data); + if (IS_ERR(udc->dev)) { + err = PTR_ERR(udc->dev); + dev_err(&pdev->dev, "failed to add HDRC device: %d\n", err); + goto fail_power_off; + } + + platform_set_drvdata(pdev, udc); + + return 0; + +fail_power_off: + usb_phy_set_suspend(udc->phy, 1); + clk_disable_unprepare(udc->clk); + return err; +} + +static int tegra_udc_remove(struct platform_device *pdev) +{ + struct tegra_udc *udc = platform_get_drvdata(pdev); + + usb_phy_set_suspend(udc->phy, 1); + clk_disable_unprepare(udc->clk); + + return 0; +} + +static struct platform_driver tegra_udc_driver = { + .driver = { + .name = "tegra-udc", + .of_match_table = tegra_udc_of_match, + }, + .probe = tegra_udc_probe, + .remove = tegra_udc_remove, +}; +module_platform_driver(tegra_udc_driver); + +MODULE_DESCRIPTION("NVIDIA Tegra USB device mode driver"); +MODULE_AUTHOR("Thierry Reding <treding@xxxxxxxxxx>"); +MODULE_ALIAS("platform:tegra-udc"); +MODULE_LICENSE("GPL v2"); -- 2.13.3 -- 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