[PATCH v2 07/12] usb: chipidea: add a generic driver

[punnaiah choudary kalluri]

Since its a generic driver, support for configuring the dma_mask using
dma_coerce_mask_and_coherent would be good.

Regards,
Punnaiah

On Tue, Jun 24, 2014 at 4:05 PM, Antoine Ténart
<antoine.tenart at free-electrons.com> wrote:
> Add a generic ChipIdea driver, with optional PHY and clock, to support
> ChipIdea controllers that doesn't need specific functions.
>
> Needed for the Marvell Berlin SoCs SUB controllers.
>
> Signed-off-by: Antoine Ténart <antoine.tenart at free-electrons.com>
> ---
>  drivers/usb/chipidea/Makefile          |   1 +
>  drivers/usb/chipidea/ci_hdrc_generic.c | 108 +++++++++++++++++++++++++++++++++
>  2 files changed, 109 insertions(+)
>  create mode 100644 drivers/usb/chipidea/ci_hdrc_generic.c
>
> diff --git a/drivers/usb/chipidea/Makefile b/drivers/usb/chipidea/Makefile
> index 2f099c7df7b5..c705f0fe7a00 100644
> --- a/drivers/usb/chipidea/Makefile
> +++ b/drivers/usb/chipidea/Makefile
> @@ -20,4 +20,5 @@ endif
>
>  ifneq ($(CONFIG_OF),)
>         obj-$(CONFIG_USB_CHIPIDEA)      += usbmisc_imx.o ci_hdrc_imx.o
> +       obj-$(CONFIG_USB_CHIPIDEA)      += ci_hdrc_generic.o
>  endif
> diff --git a/drivers/usb/chipidea/ci_hdrc_generic.c b/drivers/usb/chipidea/ci_hdrc_generic.c
> new file mode 100644
> index 000000000000..27520710a1f7
> --- /dev/null
> +++ b/drivers/usb/chipidea/ci_hdrc_generic.c
> @@ -0,0 +1,108 @@
> +/*
> + * Copyright (C) 2014 Marvell Technology Group Ltd.
> + *
> + * Antoine Ténart <antoine.tenart at free-electrons.com>
> + *
> + * This file is licensed under the terms of the GNU General Public
> + * License version 2. This program is licensed "as is" without any
> + * warranty of any kind, whether express or implied.
> + */
> +
> +#include <linux/clk.h>
> +#include <linux/module.h>
> +#include <linux/platform_device.h>
> +#include <linux/usb/chipidea.h>
> +#include <linux/usb/hcd.h>
> +#include <linux/usb/ulpi.h>
> +
> +#include "ci.h"
> +
> +struct ci_hdrc_generic_priv {
> +       struct platform_device  *ci_pdev;
> +       struct clk              *clk;
> +};
> +
> +static int ci_hdrc_generic_probe(struct platform_device *pdev)
> +{
> +       struct device *dev = &pdev->dev;
> +       struct ci_hdrc_generic_priv *priv;
> +       struct ci_hdrc_platform_data ci_pdata = {
> +               .name           = "ci_hdrc",
> +               .capoffset      = DEF_CAPOFFSET,
> +               .flags          = CI_HDRC_REQUIRE_TRANSCEIVER |
> +                                 CI_HDRC_DISABLE_STREAMING,
> +       };
> +       int ret;
> +
> +       priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
> +       if (!priv)
> +               return -ENOMEM;
> +
> +       priv->clk = devm_clk_get(dev, NULL);
> +       if (!IS_ERR(priv->clk)) {
> +               ret = clk_prepare_enable(priv->clk);
> +               if (ret) {
> +                       dev_err(dev, "failed to enable the clock: %d\n", ret);
> +                       return ret;
> +               }
> +       }
> +
> +       ci_pdata.phy = devm_usb_get_phy_by_phandle(dev, "usb-phy", 0);
> +       if (IS_ERR(ci_pdata.phy))
> +               /* PHY is optional */
> +               ci_pdata.phy = NULL;
> +
> +       priv->ci_pdev = ci_hdrc_add_device(dev, pdev->resource,
> +                                    pdev->num_resources, &ci_pdata);
> +       if (IS_ERR(priv->ci_pdev)) {
> +               ret = PTR_ERR(priv->ci_pdev);
> +               if (ret != -EPROBE_DEFER)
> +                       dev_err(dev,
> +                               "failed to register ci_hdrc platform device: %d\n",
> +                               ret);
> +               goto clk_err;
> +       }
> +
> +       platform_set_drvdata(pdev, priv);
> +
> +       pm_runtime_no_callbacks(dev);
> +       pm_runtime_enable(dev);
> +
> +       return 0;
> +
> +clk_err:
> +       clk_disable_unprepare(priv->clk);
> +       return ret;
> +}
> +
> +static int ci_hdrc_generic_remove(struct platform_device *pdev)
> +{
> +       struct ci_hdrc_generic_priv *priv = platform_get_drvdata(pdev);
> +
> +       pm_runtime_disable(&pdev->dev);
> +       ci_hdrc_remove_device(priv->ci_pdev);
> +       clk_disable_unprepare(priv->clk);
> +
> +       return 0;
> +}
> +
> +static const struct of_device_id ci_hdrc_generic_of_match[] = {
> +       { .compatible = "chipidea-usb" },
> +       { }
> +};
> +MODULE_DEVICE_TABLE(of, ci_hdrc_generic_of_match);
> +
> +static struct platform_driver ci_hdrc_generic_driver = {
> +       .probe  = ci_hdrc_generic_probe,
> +       .remove = ci_hdrc_generic_remove,
> +       .driver = {
> +               .name           = "chipidea-usb",
> +               .owner          = THIS_MODULE,
> +               .of_match_table = ci_hdrc_generic_of_match,
> +       },
> +};
> +module_platform_driver(ci_hdrc_generic_driver);
> +
> +MODULE_DESCRIPTION("Generic ChipIdea HDRC USB binding");
> +MODULE_AUTHOR("Antoine Ténart <antoine.tenart at free-electrons.com>");
> +MODULE_LICENSE("GPL");
> --
> 1.9.1
>
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