[v4,3/8] usb: chipidea: Add support for Tegra20/30/114/124

From: Thierry Reding <treding@nvidia.com>

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@rere.qmqm.pl>
Signed-off-by: Thierry Reding <treding@nvidia.com>
[digetx@gmail.com: rebased patches and added DMA alignment quirk for Tegra20]
Signed-off-by: Dmitry Osipenko <digetx@gmail.com>
Acked-by: Peter Chen <peter.chen@nxp.com>
---
 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

On 09.08.2017 14:49, Dmitry Osipenko wrote:
> From: Thierry Reding <treding@nvidia.com>
> 
> 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@rere.qmqm.pl>
> Signed-off-by: Thierry Reding <treding@nvidia.com>
> [digetx@gmail.com: rebased patches and added DMA alignment quirk for Tegra20]
> Signed-off-by: Dmitry Osipenko <digetx@gmail.com>
> Acked-by: Peter Chen <peter.chen@nxp.com>
> ---
>  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..fc55743bd768
> --- /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;
> +
> +	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;
> +	}
> +
> +	soc = of_device_get_match_data(&pdev->dev);
> +	if (!soc) {
> +		dev_err(&pdev->dev, "failed to match OF data\n");
> +		return -EINVAL;
> +	}

Oh, I made a mistake here. The code above should be before clock enabling. I'll
send V5 shortly.

> +
> +	/*
> +	 * 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 power_off;
> +	}
> +
> +	platform_set_drvdata(pdev, udc);
> +
> +	return 0;
> +
> +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@nvidia.com>");
> +MODULE_ALIAS("platform:tegra-udc");
> +MODULE_LICENSE("GPL v2");
>