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path: root/drivers/usb/dwc3/dwc3-exynos.c
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Diffstat (limited to 'drivers/usb/dwc3/dwc3-exynos.c')
-rw-r--r--drivers/usb/dwc3/dwc3-exynos.c301
1 files changed, 301 insertions, 0 deletions
diff --git a/drivers/usb/dwc3/dwc3-exynos.c b/drivers/usb/dwc3/dwc3-exynos.c
new file mode 100644
index 000000000..7bd0a95b2
--- /dev/null
+++ b/drivers/usb/dwc3/dwc3-exynos.c
@@ -0,0 +1,301 @@
+/**
+ * dwc3-exynos.c - Samsung EXYNOS DWC3 Specific Glue layer
+ *
+ * Copyright (c) 2012 Samsung Electronics Co., Ltd.
+ * http://www.samsung.com
+ *
+ * Author: Anton Tikhomirov <av.tikhomirov@samsung.com>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 of
+ * the License as published by the Free Software Foundation.
+ *
+ * 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/kernel.h>
+#include <linux/slab.h>
+#include <linux/platform_device.h>
+#include <linux/dma-mapping.h>
+#include <linux/clk.h>
+#include <linux/usb/otg.h>
+#include <linux/usb/usb_phy_generic.h>
+#include <linux/of.h>
+#include <linux/of_platform.h>
+#include <linux/regulator/consumer.h>
+
+struct dwc3_exynos {
+ struct platform_device *usb2_phy;
+ struct platform_device *usb3_phy;
+ struct device *dev;
+
+ struct clk *clk;
+ struct clk *susp_clk;
+ struct clk *axius_clk;
+
+ struct regulator *vdd33;
+ struct regulator *vdd10;
+};
+
+static int dwc3_exynos_register_phys(struct dwc3_exynos *exynos)
+{
+ struct usb_phy_generic_platform_data pdata;
+ struct platform_device *pdev;
+ int ret;
+
+ memset(&pdata, 0x00, sizeof(pdata));
+
+ pdev = platform_device_alloc("usb_phy_generic", PLATFORM_DEVID_AUTO);
+ if (!pdev)
+ return -ENOMEM;
+
+ exynos->usb2_phy = pdev;
+ pdata.type = USB_PHY_TYPE_USB2;
+ pdata.gpio_reset = -1;
+
+ ret = platform_device_add_data(exynos->usb2_phy, &pdata, sizeof(pdata));
+ if (ret)
+ goto err1;
+
+ pdev = platform_device_alloc("usb_phy_generic", PLATFORM_DEVID_AUTO);
+ if (!pdev) {
+ ret = -ENOMEM;
+ goto err1;
+ }
+
+ exynos->usb3_phy = pdev;
+ pdata.type = USB_PHY_TYPE_USB3;
+
+ ret = platform_device_add_data(exynos->usb3_phy, &pdata, sizeof(pdata));
+ if (ret)
+ goto err2;
+
+ ret = platform_device_add(exynos->usb2_phy);
+ if (ret)
+ goto err2;
+
+ ret = platform_device_add(exynos->usb3_phy);
+ if (ret)
+ goto err3;
+
+ return 0;
+
+err3:
+ platform_device_del(exynos->usb2_phy);
+
+err2:
+ platform_device_put(exynos->usb3_phy);
+
+err1:
+ platform_device_put(exynos->usb2_phy);
+
+ return ret;
+}
+
+static int dwc3_exynos_remove_child(struct device *dev, void *unused)
+{
+ struct platform_device *pdev = to_platform_device(dev);
+
+ platform_device_unregister(pdev);
+
+ return 0;
+}
+
+static int dwc3_exynos_probe(struct platform_device *pdev)
+{
+ struct dwc3_exynos *exynos;
+ struct device *dev = &pdev->dev;
+ struct device_node *node = dev->of_node;
+
+ int ret;
+
+ exynos = devm_kzalloc(dev, sizeof(*exynos), GFP_KERNEL);
+ if (!exynos)
+ return -ENOMEM;
+
+ /*
+ * Right now device-tree probed devices don't get dma_mask set.
+ * Since shared usb code relies on it, set it here for now.
+ * Once we move to full device tree support this will vanish off.
+ */
+ ret = dma_coerce_mask_and_coherent(dev, DMA_BIT_MASK(32));
+ if (ret)
+ return ret;
+
+ platform_set_drvdata(pdev, exynos);
+
+ ret = dwc3_exynos_register_phys(exynos);
+ if (ret) {
+ dev_err(dev, "couldn't register PHYs\n");
+ return ret;
+ }
+
+ exynos->dev = dev;
+
+ exynos->clk = devm_clk_get(dev, "usbdrd30");
+ if (IS_ERR(exynos->clk)) {
+ dev_err(dev, "couldn't get clock\n");
+ return -EINVAL;
+ }
+ clk_prepare_enable(exynos->clk);
+
+ exynos->susp_clk = devm_clk_get(dev, "usbdrd30_susp_clk");
+ if (IS_ERR(exynos->susp_clk)) {
+ dev_dbg(dev, "no suspend clk specified\n");
+ exynos->susp_clk = NULL;
+ }
+ clk_prepare_enable(exynos->susp_clk);
+
+ if (of_device_is_compatible(node, "samsung,exynos7-dwusb3")) {
+ exynos->axius_clk = devm_clk_get(dev, "usbdrd30_axius_clk");
+ if (IS_ERR(exynos->axius_clk)) {
+ dev_err(dev, "no AXI UpScaler clk specified\n");
+ return -ENODEV;
+ }
+ clk_prepare_enable(exynos->axius_clk);
+ } else {
+ exynos->axius_clk = NULL;
+ }
+
+ exynos->vdd33 = devm_regulator_get(dev, "vdd33");
+ if (IS_ERR(exynos->vdd33)) {
+ ret = PTR_ERR(exynos->vdd33);
+ goto err2;
+ }
+ ret = regulator_enable(exynos->vdd33);
+ if (ret) {
+ dev_err(dev, "Failed to enable VDD33 supply\n");
+ goto err2;
+ }
+
+ exynos->vdd10 = devm_regulator_get(dev, "vdd10");
+ if (IS_ERR(exynos->vdd10)) {
+ ret = PTR_ERR(exynos->vdd10);
+ goto err3;
+ }
+ ret = regulator_enable(exynos->vdd10);
+ if (ret) {
+ dev_err(dev, "Failed to enable VDD10 supply\n");
+ goto err3;
+ }
+
+ if (node) {
+ ret = of_platform_populate(node, NULL, NULL, dev);
+ if (ret) {
+ dev_err(dev, "failed to add dwc3 core\n");
+ goto err4;
+ }
+ } else {
+ dev_err(dev, "no device node, failed to add dwc3 core\n");
+ ret = -ENODEV;
+ goto err4;
+ }
+
+ return 0;
+
+err4:
+ regulator_disable(exynos->vdd10);
+err3:
+ regulator_disable(exynos->vdd33);
+err2:
+ clk_disable_unprepare(exynos->axius_clk);
+ clk_disable_unprepare(exynos->susp_clk);
+ clk_disable_unprepare(exynos->clk);
+ return ret;
+}
+
+static int dwc3_exynos_remove(struct platform_device *pdev)
+{
+ struct dwc3_exynos *exynos = platform_get_drvdata(pdev);
+
+ device_for_each_child(&pdev->dev, NULL, dwc3_exynos_remove_child);
+ platform_device_unregister(exynos->usb2_phy);
+ platform_device_unregister(exynos->usb3_phy);
+
+ clk_disable_unprepare(exynos->axius_clk);
+ clk_disable_unprepare(exynos->susp_clk);
+ clk_disable_unprepare(exynos->clk);
+
+ regulator_disable(exynos->vdd33);
+ regulator_disable(exynos->vdd10);
+
+ return 0;
+}
+
+static const struct of_device_id exynos_dwc3_match[] = {
+ { .compatible = "samsung,exynos5250-dwusb3" },
+ { .compatible = "samsung,exynos7-dwusb3" },
+ {},
+};
+MODULE_DEVICE_TABLE(of, exynos_dwc3_match);
+
+#ifdef CONFIG_PM_SLEEP
+static int dwc3_exynos_suspend(struct device *dev)
+{
+ struct dwc3_exynos *exynos = dev_get_drvdata(dev);
+
+ clk_disable(exynos->axius_clk);
+ clk_disable(exynos->clk);
+
+ regulator_disable(exynos->vdd33);
+ regulator_disable(exynos->vdd10);
+
+ return 0;
+}
+
+static int dwc3_exynos_resume(struct device *dev)
+{
+ struct dwc3_exynos *exynos = dev_get_drvdata(dev);
+ int ret;
+
+ ret = regulator_enable(exynos->vdd33);
+ if (ret) {
+ dev_err(dev, "Failed to enable VDD33 supply\n");
+ return ret;
+ }
+ ret = regulator_enable(exynos->vdd10);
+ if (ret) {
+ dev_err(dev, "Failed to enable VDD10 supply\n");
+ return ret;
+ }
+
+ clk_enable(exynos->clk);
+ clk_enable(exynos->axius_clk);
+
+ /* runtime set active to reflect active state. */
+ pm_runtime_disable(dev);
+ pm_runtime_set_active(dev);
+ pm_runtime_enable(dev);
+
+ return 0;
+}
+
+static const struct dev_pm_ops dwc3_exynos_dev_pm_ops = {
+ SET_SYSTEM_SLEEP_PM_OPS(dwc3_exynos_suspend, dwc3_exynos_resume)
+};
+
+#define DEV_PM_OPS (&dwc3_exynos_dev_pm_ops)
+#else
+#define DEV_PM_OPS NULL
+#endif /* CONFIG_PM_SLEEP */
+
+static struct platform_driver dwc3_exynos_driver = {
+ .probe = dwc3_exynos_probe,
+ .remove = dwc3_exynos_remove,
+ .driver = {
+ .name = "exynos-dwc3",
+ .of_match_table = exynos_dwc3_match,
+ .pm = DEV_PM_OPS,
+ },
+};
+
+module_platform_driver(dwc3_exynos_driver);
+
+MODULE_ALIAS("platform:exynos-dwc3");
+MODULE_AUTHOR("Anton Tikhomirov <av.tikhomirov@samsung.com>");
+MODULE_LICENSE("GPL v2");
+MODULE_DESCRIPTION("DesignWare USB3 EXYNOS Glue Layer");
generated by cgit v1.2.3 (git 2.25.1) at 2024-07-01 16:58:42 +0000