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235 lines
6.3 KiB
Diff
235 lines
6.3 KiB
Diff
From 41c2b5280cd2fa3e198c422cdf223ba6e48f857a Mon Sep 17 00:00:00 2001
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From: Felipe Balbi <balbi@ti.com>
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Date: Wed, 18 Nov 2015 13:15:20 -0600
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Subject: [PATCH] usb: dwc3: add generic OF glue layer
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For simple platforms which merely enable some clocks
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and populate its children, we can use this generic
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glue layer to avoid boilerplate code duplication.
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For now this supports Qcom and Xilinx, but if we
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find a way to add generic handling of regulators and
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optional PHYs, we can absorb exynos as well.
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Tested-by: Subbaraya Sundeep Bhatta <subbaraya.sundeep.bhatta@xilinx.com>
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Signed-off-by: Felipe Balbi <balbi@ti.com>
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(cherry picked from commit 16adc674d0d68a50dfc725574738d7ae11cf5d7e)
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Change-Id: I6fd260442997b198dc12ca726814b7a9518e6353
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Signed-off-by: Nitheesh Sekar <nsekar@codeaurora.org>
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---
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drivers/usb/dwc3/Kconfig | 9 ++
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drivers/usb/dwc3/Makefile | 1 +
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drivers/usb/dwc3/dwc3-of-simple.c | 178 ++++++++++++++++++++++++++++++++++++++
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3 files changed, 188 insertions(+)
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create mode 100644 drivers/usb/dwc3/dwc3-of-simple.c
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--- a/drivers/usb/dwc3/Kconfig
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+++ b/drivers/usb/dwc3/Kconfig
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@@ -87,6 +87,15 @@ config USB_DWC3_KEYSTONE
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Support of USB2/3 functionality in TI Keystone2 platforms.
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Say 'Y' or 'M' here if you have one such device
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+config USB_DWC3_OF_SIMPLE
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+ tristate "Generic OF Simple Glue Layer"
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+ depends on OF && COMMON_CLK
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+ default USB_DWC3
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+ help
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+ Support USB2/3 functionality in simple SoC integrations.
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+ Currently supports Xilinx and Qualcomm DWC USB3 IP.
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+ Say 'Y' or 'M' if you have one such device.
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+
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config USB_DWC3_ST
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tristate "STMicroelectronics Platforms"
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depends on ARCH_STI && OF
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--- a/drivers/usb/dwc3/Makefile
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+++ b/drivers/usb/dwc3/Makefile
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@@ -37,5 +37,6 @@ obj-$(CONFIG_USB_DWC3_OMAP) += dwc3-oma
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obj-$(CONFIG_USB_DWC3_EXYNOS) += dwc3-exynos.o
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obj-$(CONFIG_USB_DWC3_PCI) += dwc3-pci.o
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obj-$(CONFIG_USB_DWC3_KEYSTONE) += dwc3-keystone.o
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+obj-$(CONFIG_USB_DWC3_OF_SIMPLE) += dwc3-of-simple.o
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obj-$(CONFIG_USB_DWC3_QCOM) += dwc3-qcom.o
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obj-$(CONFIG_USB_DWC3_ST) += dwc3-st.o
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--- /dev/null
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+++ b/drivers/usb/dwc3/dwc3-of-simple.c
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@@ -0,0 +1,178 @@
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+/**
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+ * dwc3-of-simple.c - OF glue layer for simple integrations
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+ *
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+ * Copyright (c) 2015 Texas Instruments Incorporated - http://www.ti.com
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+ *
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+ * Author: Felipe Balbi <balbi@ti.com>
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+ *
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+ * This program is free software: you can redistribute it and/or modify
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+ * it under the terms of the GNU General Public License version 2 of
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+ * the License as published by the Free Software Foundation.
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+ *
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+ * This program is distributed in the hope that it will be useful,
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+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
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+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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+ * GNU General Public License for more details.
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+ *
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+ * This is a combination of the old dwc3-qcom.c by Ivan T. Ivanov
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+ * <iivanov@mm-sol.com> and the original patch adding support for Xilinx' SoC
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+ * by Subbaraya Sundeep Bhatta <subbaraya.sundeep.bhatta@xilinx.com>
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+ */
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+
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+#include <linux/module.h>
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+#include <linux/kernel.h>
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+#include <linux/slab.h>
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+#include <linux/platform_device.h>
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+#include <linux/dma-mapping.h>
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+#include <linux/clk.h>
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+#include <linux/clk-provider.h>
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+#include <linux/of.h>
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+#include <linux/of_platform.h>
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+#include <linux/pm_runtime.h>
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+
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+struct dwc3_of_simple {
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+ struct device *dev;
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+ struct clk **clks;
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+ int num_clocks;
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+};
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+
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+static int dwc3_of_simple_probe(struct platform_device *pdev)
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+{
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+ struct dwc3_of_simple *simple;
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+ struct device *dev = &pdev->dev;
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+ struct device_node *np = dev->of_node;
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+
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+ int ret;
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+ int i;
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+
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+ simple = devm_kzalloc(dev, sizeof(*simple), GFP_KERNEL);
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+ if (!simple)
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+ return -ENOMEM;
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+
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+ ret = of_clk_get_parent_count(np);
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+ if (ret < 0)
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+ return ret;
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+
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+ simple->num_clocks = ret;
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+
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+ simple->clks = devm_kcalloc(dev, simple->num_clocks,
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+ sizeof(struct clk *), GFP_KERNEL);
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+ if (!simple->clks)
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+ return -ENOMEM;
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+
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+ simple->dev = dev;
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+
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+ for (i = 0; i < simple->num_clocks; i++) {
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+ struct clk *clk;
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+
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+ clk = of_clk_get(np, i);
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+ if (IS_ERR(clk)) {
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+ while (--i >= 0)
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+ clk_put(simple->clks[i]);
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+ return PTR_ERR(clk);
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+ }
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+
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+ ret = clk_prepare_enable(clk);
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+ if (ret < 0) {
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+ while (--i >= 0) {
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+ clk_disable_unprepare(simple->clks[i]);
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+ clk_put(simple->clks[i]);
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+ }
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+ clk_put(clk);
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+
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+ return ret;
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+ }
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+
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+ simple->clks[i] = clk;
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+ }
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+
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+ ret = of_platform_populate(np, NULL, NULL, dev);
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+ if (ret) {
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+ for (i = 0; i < simple->num_clocks; i++) {
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+ clk_disable_unprepare(simple->clks[i]);
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+ clk_put(simple->clks[i]);
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+ }
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+
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+ return ret;
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+ }
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+
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+ pm_runtime_set_active(dev);
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+ pm_runtime_enable(dev);
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+ pm_runtime_get_sync(dev);
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+
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+ return 0;
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+}
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+
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+static int dwc3_of_simple_remove(struct platform_device *pdev)
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+{
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+ struct dwc3_of_simple *simple = platform_get_drvdata(pdev);
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+ struct device *dev = &pdev->dev;
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+ int i;
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+
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+ for (i = 0; i < simple->num_clocks; i++) {
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+ clk_unprepare(simple->clks[i]);
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+ clk_put(simple->clks[i]);
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+ }
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+
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+ of_platform_depopulate(dev);
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+
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+ pm_runtime_put_sync(dev);
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+ pm_runtime_disable(dev);
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+
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+ return 0;
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+}
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+
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+static int dwc3_of_simple_runtime_suspend(struct device *dev)
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+{
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+ struct dwc3_of_simple *simple = dev_get_drvdata(dev);
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+ int i;
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+
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+ for (i = 0; i < simple->num_clocks; i++)
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+ clk_disable(simple->clks[i]);
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+
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+ return 0;
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+}
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+
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+static int dwc3_of_simple_runtime_resume(struct device *dev)
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+{
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+ struct dwc3_of_simple *simple = dev_get_drvdata(dev);
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+ int ret;
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+ int i;
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+
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+ for (i = 0; i < simple->num_clocks; i++) {
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+ ret = clk_enable(simple->clks[i]);
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+ if (ret < 0) {
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+ while (--i >= 0)
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+ clk_disable(simple->clks[i]);
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+ return ret;
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+ }
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+ }
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+
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+ return 0;
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+}
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+
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+static const struct dev_pm_ops dwc3_of_simple_dev_pm_ops = {
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+ SET_RUNTIME_PM_OPS(dwc3_of_simple_runtime_suspend,
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+ dwc3_of_simple_runtime_resume, NULL)
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+};
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+
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+static const struct of_device_id of_dwc3_simple_match[] = {
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+ { .compatible = "qcom,dwc3" },
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+ { .compatible = "xlnx,zynqmp-dwc3" },
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+ { /* Sentinel */ }
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+};
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+MODULE_DEVICE_TABLE(of, of_dwc3_simple_match);
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+
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+static struct platform_driver dwc3_of_simple_driver = {
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+ .probe = dwc3_of_simple_probe,
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+ .remove = dwc3_of_simple_remove,
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+ .driver = {
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+ .name = "dwc3-of-simple",
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+ .of_match_table = of_dwc3_simple_match,
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+ },
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+};
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+
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+module_platform_driver(dwc3_of_simple_driver);
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+MODULE_LICENSE("GPL v2");
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+MODULE_DESCRIPTION("DesignWare USB3 OF Simple Glue Layer");
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+MODULE_AUTHOR("Felipe Balbi <balbi@ti.com>");
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