[PATCH v2 2/2] usb: chipidea: Add support for zynq usb host and device controller

[Punnaiah Choudary Kalluri <punnaiah.choudary.kalluri@xilinx.com>]

Zynq soc uses Chipidea/Synopsys usb IP core(CI13612). This patch adds
necessary glue to allow the chipidea driver to work on zynq soc.

Signed-off-by: Punnaiah Choudary Kalluri <punnaia@xilinx.com>
---
Changes in v2:
- modified the commit message for better readability
- fixed the dev_err message
---
 drivers/usb/chipidea/Makefile       |    1 +
 drivers/usb/chipidea/ci_hdrc_zynq.c |  115 +++++++++++++++++++++++++++++++++++
 2 files changed, 116 insertions(+), 0 deletions(-)
 create mode 100644 drivers/usb/chipidea/ci_hdrc_zynq.c

diff --git a/drivers/usb/chipidea/Makefile b/drivers/usb/chipidea/Makefile
index 2f099c7..b0d6b6f 100644
--- a/drivers/usb/chipidea/Makefile
+++ b/drivers/usb/chipidea/Makefile
@@ -12,6 +12,7 @@ ci_hdrc-$(CONFIG_USB_OTG_FSM)		+= otg_fsm.o
 
 obj-$(CONFIG_USB_CHIPIDEA)	+= ci_hdrc_msm.o
 obj-$(CONFIG_USB_CHIPIDEA)	+= ci_hdrc_zevio.o
+obj-$(CONFIG_USB_CHIPIDEA)	+= ci_hdrc_zynq.o
 
 # PCI doesn't provide stubs, need to check
 ifneq ($(CONFIG_PCI),)
diff --git a/drivers/usb/chipidea/ci_hdrc_zynq.c b/drivers/usb/chipidea/ci_hdrc_zynq.c
new file mode 100644
index 0000000..5ef2717
--- /dev/null
+++ b/drivers/usb/chipidea/ci_hdrc_zynq.c
@@ -0,0 +1,115 @@
+/*
+ * Copyright (C) 2014 Xilinx, Inc.
+ *
+ * This program is free software; you can redistribute it and/or modify it under
+ * the terms of the GNU General Public License version 2 as published by the
+ * Free Software Foundation; either version 2 of the License, or (at your
+ * option) any later version.
+ */
+
+#include <linux/clk.h>
+#include <linux/dma-mapping.h>
+#include <linux/module.h>
+#include <linux/of_platform.h>
+#include <linux/platform_device.h>
+#include <linux/pm_runtime.h>
+#include <linux/usb/chipidea.h>
+
+#include "ci.h"
+
+#define ZYNQ_USB_DMA_MASK	0xFFFFFFF0
+
+struct ci_hdrc_zynq_data {
+	struct platform_device *ci_pdev;
+	struct clk *clk;
+};
+
+static struct ci_hdrc_platform_data pdata = {
+	.name           = "ci_hdrc_zynq",
+	.capoffset      = DEF_CAPOFFSET,
+	.flags          = CI_HDRC_REQUIRE_TRANSCEIVER
+};
+
+static int ci_hdrc_zynq_probe(struct platform_device *pdev)
+{
+	struct ci_hdrc_zynq_data *data;
+	int ret;
+
+	data = devm_kzalloc(&pdev->dev, sizeof(*data), GFP_KERNEL);
+	if (!data) {
+		dev_err(&pdev->dev, "Failed to allocate ci_hdrc_zynq data!\n");
+		return -ENOMEM;
+	}
+
+	data->clk = devm_clk_get(&pdev->dev, NULL);
+	if (IS_ERR(data->clk)) {
+		dev_err(&pdev->dev,
+			"Failed to get clock, err=%ld\n", PTR_ERR(data->clk));
+		return PTR_ERR(data->clk);
+	}
+
+	ret = clk_prepare_enable(data->clk);
+	if (ret) {
+		dev_err(&pdev->dev,
+			"Failed to prepare or enable clock, err=%d\n", ret);
+		return ret;
+	}
+
+	ret = dma_coerce_mask_and_coherent(&pdev->dev, ZYNQ_USB_DMA_MASK);
+	if (ret)
+		goto err_clk;
+
+	data->ci_pdev = ci_hdrc_add_device(&pdev->dev,
+				pdev->resource, pdev->num_resources,
+				&pdata);
+	if (IS_ERR(data->ci_pdev)) {
+		ret = PTR_ERR(data->ci_pdev);
+		dev_err(&pdev->dev,
+			"Can't register ci_hdrc platform device, err=%d\n",
+			ret);
+		goto err_clk;
+	}
+
+	platform_set_drvdata(pdev, data);
+
+	pm_runtime_no_callbacks(&pdev->dev);
+	pm_runtime_enable(&pdev->dev);
+	return 0;
+
+err_clk:
+	clk_disable_unprepare(data->clk);
+	return ret;
+}
+
+static int ci_hdrc_zynq_remove(struct platform_device *pdev)
+{
+	struct ci_hdrc_zynq_data *data = platform_get_drvdata(pdev);
+
+	pm_runtime_disable(&pdev->dev);
+	ci_hdrc_remove_device(data->ci_pdev);
+	clk_disable_unprepare(data->clk);
+
+	return 0;
+}
+
+static const struct of_device_id ci_hdrc_zynq_dt_ids[] = {
+	{ .compatible = "xlnx,zynq-usb-2.20a" },
+	{},
+};
+
+static struct platform_driver ci_hdrc_zynq_driver = {
+	.probe = ci_hdrc_zynq_probe,
+	.remove = ci_hdrc_zynq_remove,
+	.driver = {
+		.name = "zynq_usb",
+		.owner = THIS_MODULE,
+		.of_match_table = ci_hdrc_zynq_dt_ids,
+	 },
+};
+
+module_platform_driver(ci_hdrc_zynq_driver);
+
+MODULE_ALIAS("platform:zynq_usb");
+MODULE_DESCRIPTION("CI HDRC ZYNQ USB binding");
+MODULE_AUTHOR("Xilinx Inc");
+MODULE_LICENSE("GPL v2");
-- 
1.7.4