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    Subject[PATCH 2/3] usb: dwc3: add Fujitsu Specific Glue layer
    Date
    This patch adds support for Synopsis DesignWare USB3 IP Core found
    on Fujitsu Socs.

    Signed-off-by: Sneeker Yeh <Sneeker.Yeh@tw.fujitsu.com>
    ---
    .../devicetree/bindings/usb/fujitsu-dwc3.txt | 25 +++
    drivers/usb/dwc3/Kconfig | 11 ++
    drivers/usb/dwc3/Makefile | 1 +
    drivers/usb/dwc3/dwc3-mb86s70.c | 194 ++++++++++++++++++++
    4 files changed, 231 insertions(+)
    create mode 100644 Documentation/devicetree/bindings/usb/fujitsu-dwc3.txt
    create mode 100644 drivers/usb/dwc3/dwc3-mb86s70.c

    diff --git a/Documentation/devicetree/bindings/usb/fujitsu-dwc3.txt b/Documentation/devicetree/bindings/usb/fujitsu-dwc3.txt
    new file mode 100644
    index 0000000..df77f91
    --- /dev/null
    +++ b/Documentation/devicetree/bindings/usb/fujitsu-dwc3.txt
    @@ -0,0 +1,25 @@
    +FUJITSU GLUE COMPONENTS
    +
    +MB86S7x DWC3 GLUE
    + - compatible : Should be "fujitsu,mb86s70-dwc3"
    + - clocks: from common clock binding, handle to usb clock.
    + - clock-names: from common clock binding.
    + - #address-cells, #size-cells : Must be present if the device has sub-nodes
    + - ranges: the child address space are mapped 1:1 onto the parent address space
    + - #stream-id-cells : handle to use "arm,mmu-400" ARM IOMMU driver
    +
    +Sub-nodes:
    +The dwc3 core should be added as subnode to MB86S7x dwc3 glue.
    +- dwc3 :
    + The binding details of dwc3 can be found in:
    + Documentation/devicetree/bindings/usb/dwc3.txt
    +
    +usb3host: mb86s70_usb3host {
    + compatible = "fujitsu,mb86s70-dwc3";
    + clocks = <&clk_alw_1_1>;
    + clock-names = "bus_clk";
    + #address-cells = <2>;
    + #size-cells = <1>;
    + ranges;
    + #stream-id-cells = <0>;
    +};
    diff --git a/drivers/usb/dwc3/Kconfig b/drivers/usb/dwc3/Kconfig
    index 58b5b2c..3390d42 100644
    --- a/drivers/usb/dwc3/Kconfig
    +++ b/drivers/usb/dwc3/Kconfig
    @@ -61,6 +61,17 @@ config USB_DWC3_EXYNOS
    Recent Exynos5 SoCs ship with one DesignWare Core USB3 IP inside,
    say 'Y' or 'M' if you have one such device.

    +config USB_DWC3_MB86S70
    + tristate "MB86S70 Designware USB3 Platform code"
    + default USB_DWC3
    + help
    + MB86S7X SOC ship with DesignWare Core USB3 IP inside,
    + this implementation also integrated Fujitsu USB PHY inside
    + this Core USB3 IP.
    +
    + say 'Y' or 'M' if you have one such device.
    +
    +
    config USB_DWC3_PCI
    tristate "PCIe-based Platforms"
    depends on PCI
    diff --git a/drivers/usb/dwc3/Makefile b/drivers/usb/dwc3/Makefile
    index bb34fbc..05d1de2 100644
    --- a/drivers/usb/dwc3/Makefile
    +++ b/drivers/usb/dwc3/Makefile
    @@ -38,3 +38,4 @@ obj-$(CONFIG_USB_DWC3_PCI) += dwc3-pci.o
    obj-$(CONFIG_USB_DWC3_KEYSTONE) += dwc3-keystone.o
    obj-$(CONFIG_USB_DWC3_QCOM) += dwc3-qcom.o
    obj-$(CONFIG_USB_DWC3_ST) += dwc3-st.o
    +obj-$(CONFIG_USB_DWC3_MB86S70) += dwc3-mb86s70.o
    diff --git a/drivers/usb/dwc3/dwc3-mb86s70.c b/drivers/usb/dwc3/dwc3-mb86s70.c
    new file mode 100644
    index 0000000..241c5bd
    --- /dev/null
    +++ b/drivers/usb/dwc3/dwc3-mb86s70.c
    @@ -0,0 +1,194 @@
    +/**
    + * dwc3-mb86s70.c - Fujitsu mb86s70 DWC3 Specific Glue layer
    + *
    + * Copyright (c) 2013 - 2014 FUJITSU SEMICONDUCTOR LIMITED
    + * http://jp.fujitsu.com/group/fsl
    + *
    + * Author: Alice Chan <Alice.Chan@tw.fujitsu.com>
    + * based on dwc3-exynos.c
    + *
    + * This program is free software; you can redistribute it and/or modify
    + * it under the terms of the GNU General Public License as published by
    + * the Free Software Foundation; either version 2 of the License, or
    + * (at your option) any later version.
    + */
    +
    +#include <linux/module.h>
    +#include <linux/kernel.h>
    +#include <linux/slab.h>
    +#include <linux/platform_device.h>
    +#include <linux/dma-mapping.h>
    +#include <linux/interrupt.h>
    +#include <linux/of.h>
    +#include <linux/of_platform.h>
    +#include <linux/pm_runtime.h>
    +#include <linux/clk.h>
    +
    +struct dwc3_mb86s70 {
    + struct device *dev;
    + struct clk **clk_table;
    +};
    +
    +/* return 0 means successful */
    +static int dwc3_mb86s70_clk_control(struct device *dev, bool on)
    +{
    + int ret, i;
    + struct clk *clk;
    +
    + if (!on)
    + goto clock_off;
    +
    + for (i = 0;; i++) {
    + clk = of_clk_get(dev->of_node, i);
    + if (IS_ERR(clk))
    + break;
    +
    + ret = clk_prepare_enable(clk);
    + if (ret) {
    + dev_err(dev, "failed to enable clock[%d]\n", i);
    + goto clock_off;
    + }
    + }
    +
    + return 0;
    +
    +clock_off:
    + for (i = 0;; i++) {
    + clk = of_clk_get(dev->of_node, i);
    + if (IS_ERR(clk))
    + break;
    +
    + clk_disable_unprepare(clk);
    + }
    +
    + return on;
    +}
    +
    +static int dwc3_mb86s70_remove_child(struct device *dev, void *unused)
    +{
    + struct platform_device *pdev = to_platform_device(dev);
    +
    + of_device_unregister(pdev);
    +
    + return 0;
    +}
    +
    +static u64 dwc3_mb86s70_dma_mask = DMA_BIT_MASK(32);
    +
    +static int dwc3_mb86s70_probe(struct platform_device *pdev)
    +{
    + struct dwc3_mb86s70 *mb86s70;
    + struct device *dev = &pdev->dev;
    + struct device_node *node = dev->of_node;
    + int ret;
    +
    + mb86s70 = devm_kzalloc(dev, sizeof(*mb86s70), GFP_KERNEL);
    + if (!mb86s70) {
    + ret = -ENOMEM;
    + goto err;
    + }
    +
    + dev->dma_mask = &dwc3_mb86s70_dma_mask;
    +
    + platform_set_drvdata(pdev, mb86s70);
    +
    + mb86s70->dev = dev;
    +
    + /* resume driver for clock, power */
    + pm_runtime_enable(&pdev->dev);
    + ret = pm_runtime_get_sync(&pdev->dev);
    + if (ret < 0) {
    + dev_err(&pdev->dev, "get_sync failed with err %d\n", ret);
    + goto err;
    + }
    +
    + if (node) {
    + ret = of_platform_populate(node, NULL, NULL, dev);
    + if (!ret)
    + return 0;
    + dev_err(dev, "failed to add dwc3 core\n");
    + }
    + dev_err(dev, "no device node, failed to add dwc3 core\n");
    + ret = -ENODEV;
    +
    +err:
    + return ret;
    +}
    +
    +static int dwc3_mb86s70_remove(struct platform_device *pdev)
    +{
    + device_for_each_child(&pdev->dev, NULL, dwc3_mb86s70_remove_child);
    +
    + pm_runtime_put_sync(&pdev->dev);
    + pm_runtime_disable(&pdev->dev);
    +
    + return 0;
    +}
    +
    +static const struct of_device_id mb86s70_dwc3_match[] = {
    + { .compatible = "fujitsu,mb86s70-dwc3" },
    + {},
    +};
    +MODULE_DEVICE_TABLE(of, mb86s70_dwc3_match);
    +
    +#ifdef CONFIG_PM
    +#ifdef CONFIG_PM_RUNTIME
    +static int dwc3_mb86s70_runtime_suspend(struct device *dev)
    +{
    + dwc3_mb86s70_clk_control(dev, false);
    +
    + return 0;
    +}
    +
    +static int dwc3_mb86s70_runtime_resume(struct device *dev)
    +{
    + dwc3_mb86s70_clk_control(dev, true);
    +
    + return 0;
    +}
    +#endif /* CONFIG_PM_RUNTIME */
    +static int dwc3_mb86s70_suspend(struct device *dev)
    +{
    + if (pm_runtime_status_suspended(dev))
    + return 0;
    +
    + return dwc3_mb86s70_runtime_suspend(dev);
    +}
    +
    +static int dwc3_mb86s70_resume(struct device *dev)
    +{
    + if (pm_runtime_status_suspended(dev))
    + return 0;
    +
    + return dwc3_mb86s70_runtime_resume(dev);
    +}
    +
    +static const struct dev_pm_ops dwc3_mb86s70_dev_pm_ops = {
    + .suspend = dwc3_mb86s70_suspend,
    + .resume = dwc3_mb86s70_resume,
    + SET_RUNTIME_PM_OPS(
    + dwc3_mb86s70_runtime_suspend,
    + dwc3_mb86s70_runtime_resume, NULL)
    +};
    +
    +#define DEV_PM_OPS (&dwc3_mb86s70_dev_pm_ops)
    +#else
    +#define DEV_PM_OPS NULL
    +#endif /* CONFIG_PM_SLEEP */
    +
    +static struct platform_driver dwc3_mb86s70_driver = {
    + .probe = dwc3_mb86s70_probe,
    + .remove = dwc3_mb86s70_remove,
    + .driver = {
    + .name = "mb86s70-dwc3",
    + .of_match_table = of_match_ptr(mb86s70_dwc3_match),
    + .pm = DEV_PM_OPS,
    + },
    +};
    +
    +module_platform_driver(dwc3_mb86s70_driver);
    +
    +MODULE_ALIAS("platform:mb86s70-dwc3");
    +MODULE_AUTHOR("Alice Chan <Alice.Chan@tw.fujitsu.com>");
    +MODULE_LICENSE("GPL");
    +MODULE_DESCRIPTION("DesignWare USB3 mb86s70 Glue Layer");
    --
    1.7.9.5


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