Add the rt linux 4.1.3-rt3 as base

[kvmfornfv.git] / kernel / drivers / usb / dwc3 / dwc3-qcom.c

diff --git a/kernel/drivers/usb/dwc3/dwc3-qcom.c b/kernel/drivers/usb/dwc3/dwc3-qcom.c
new file mode 100644 (file)
index 0000000..8c2e8ee
--- /dev/null
+++ b/kernel/drivers/usb/dwc3/dwc3-qcom.c
@@ -0,0 +1,130 @@
+/* Copyright (c) 2013-2014, The Linux Foundation. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 and
+ * only version 2 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/clk.h>
+#include <linux/err.h>
+#include <linux/io.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/of_platform.h>
+#include <linux/platform_device.h>
+
+struct dwc3_qcom {
+       struct device           *dev;
+
+       struct clk              *core_clk;
+       struct clk              *iface_clk;
+       struct clk              *sleep_clk;
+};
+
+static int dwc3_qcom_probe(struct platform_device *pdev)
+{
+       struct device_node *node = pdev->dev.of_node;
+       struct dwc3_qcom *qdwc;
+       int ret;
+
+       qdwc = devm_kzalloc(&pdev->dev, sizeof(*qdwc), GFP_KERNEL);
+       if (!qdwc)
+               return -ENOMEM;
+
+       platform_set_drvdata(pdev, qdwc);
+
+       qdwc->dev = &pdev->dev;
+
+       qdwc->core_clk = devm_clk_get(qdwc->dev, "core");
+       if (IS_ERR(qdwc->core_clk)) {
+               dev_err(qdwc->dev, "failed to get core clock\n");
+               return PTR_ERR(qdwc->core_clk);
+       }
+
+       qdwc->iface_clk = devm_clk_get(qdwc->dev, "iface");
+       if (IS_ERR(qdwc->iface_clk)) {
+               dev_dbg(qdwc->dev, "failed to get optional iface clock\n");
+               qdwc->iface_clk = NULL;
+       }
+
+       qdwc->sleep_clk = devm_clk_get(qdwc->dev, "sleep");
+       if (IS_ERR(qdwc->sleep_clk)) {
+               dev_dbg(qdwc->dev, "failed to get optional sleep clock\n");
+               qdwc->sleep_clk = NULL;
+       }
+
+       ret = clk_prepare_enable(qdwc->core_clk);
+       if (ret) {
+               dev_err(qdwc->dev, "failed to enable core clock\n");
+               goto err_core;
+       }
+
+       ret = clk_prepare_enable(qdwc->iface_clk);
+       if (ret) {
+               dev_err(qdwc->dev, "failed to enable optional iface clock\n");
+               goto err_iface;
+       }
+
+       ret = clk_prepare_enable(qdwc->sleep_clk);
+       if (ret) {
+               dev_err(qdwc->dev, "failed to enable optional sleep clock\n");
+               goto err_sleep;
+       }
+
+       ret = of_platform_populate(node, NULL, NULL, qdwc->dev);
+       if (ret) {
+               dev_err(qdwc->dev, "failed to register core - %d\n", ret);
+               goto err_clks;
+       }
+
+       return 0;
+
+err_clks:
+       clk_disable_unprepare(qdwc->sleep_clk);
+err_sleep:
+       clk_disable_unprepare(qdwc->iface_clk);
+err_iface:
+       clk_disable_unprepare(qdwc->core_clk);
+err_core:
+       return ret;
+}
+
+static int dwc3_qcom_remove(struct platform_device *pdev)
+{
+       struct dwc3_qcom *qdwc = platform_get_drvdata(pdev);
+
+       of_platform_depopulate(&pdev->dev);
+
+       clk_disable_unprepare(qdwc->sleep_clk);
+       clk_disable_unprepare(qdwc->iface_clk);
+       clk_disable_unprepare(qdwc->core_clk);
+
+       return 0;
+}
+
+static const struct of_device_id of_dwc3_match[] = {
+       { .compatible = "qcom,dwc3" },
+       { /* Sentinel */ }
+};
+MODULE_DEVICE_TABLE(of, of_dwc3_match);
+
+static struct platform_driver dwc3_qcom_driver = {
+       .probe          = dwc3_qcom_probe,
+       .remove         = dwc3_qcom_remove,
+       .driver         = {
+               .name   = "qcom-dwc3",
+               .of_match_table = of_dwc3_match,
+       },
+};
+
+module_platform_driver(dwc3_qcom_driver);
+
+MODULE_ALIAS("platform:qcom-dwc3");
+MODULE_LICENSE("GPL v2");
+MODULE_DESCRIPTION("DesignWare USB3 QCOM Glue Layer");
+MODULE_AUTHOR("Ivan T. Ivanov <iivanov@mm-sol.com>");