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.
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 | 160 +++++++++++++++++++++++++++++++++++
2 files changed, 161 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..7814500e71fa
--- /dev/null
+++ b/drivers/usb/chipidea/ci_hdrc_tegra.c
@@ -0,0 +1,160 @@
+/*
+ * 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/platform_device.h>
+#include <linux/reset.h>
+
+#include <linux/usb/chipidea.h>
+
+#include "ci.h"
+
+struct tegra_udc_soc_info {
+ bool supports_unaligned_dma;
+};
+
+struct tegra_udc {
+ struct ci_hdrc_platform_data data;
+ struct platform_device *dev;
+
+ struct usb_phy *phy;
+ struct clk *clk;
+};
+
+static const struct tegra_udc_soc_info tegra20_udc_soc_info = {
+ .supports_unaligned_dma = false,
+};
+
+static const struct tegra_udc_soc_info tegra30_udc_soc_info = {
+ .supports_unaligned_dma = true,
+};
+
+static const struct tegra_udc_soc_info tegra114_udc_soc_info = {
+ .supports_unaligned_dma = true,
+};
+
+static const struct tegra_udc_soc_info tegra124_udc_soc_info = {
+ .supports_unaligned_dma = true,
+};
+
+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;
+ const struct of_device_id *id;
+ struct tegra_udc *udc;
+ int err;
+
+ udc = devm_kzalloc(&pdev->dev, sizeof(*udc), GFP_KERNEL);
+ if (!udc)
+ return -ENOMEM;
+
+ id = of_match_node(tegra_udc_of_match, pdev->dev.of_node);
+ if (!id)
+ return -ENODEV;
+
+ 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;
+ }
+
+ /* setup and register ChipIdea HDRC device */
+ udc->data.name = "tegra-udc";
+ udc->data.capoffset = DEF_CAPOFFSET;
+ udc->data.flags = 0;
+ udc->data.usb_phy = udc->phy;
+
+ /* setup device specific quirks */
+ soc = id->data;
+
+ if (!soc->supports_unaligned_dma)
+ udc->data.flags |= CI_HDRC_REQUIRES_ALIGNED_DMA;
+
+ /*
+ * 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);
+
+ 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@xxxxxxxxxx>");
+MODULE_ALIAS("platform:tegra-udc");
+MODULE_LICENSE("GPL v2");
--
2.13.3
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