[PATCH v1 4/7] usb: chipidea: add imx driver binding

[alexander.shishkin@linux.intel.com (Alexander Shishkin)]

Richard Zhao <richard.zhao@freescale.com> writes:

> Signed-off-by: Richard Zhao <richard.zhao@freescale.com>

Besides things that were already pointed out, some minor comments below:

> ---
>  drivers/usb/chipidea/Makefile      |    2 +-
>  drivers/usb/chipidea/ci13xxx_imx.c |  177 ++++++++++++++++++++++++++++++++++++
>  2 files changed, 178 insertions(+), 1 deletions(-)
>  create mode 100644 drivers/usb/chipidea/ci13xxx_imx.c
>
> diff --git a/drivers/usb/chipidea/Makefile b/drivers/usb/chipidea/Makefile
> index 0f34c0c..6821385 100644
> --- a/drivers/usb/chipidea/Makefile
> +++ b/drivers/usb/chipidea/Makefile
> @@ -14,5 +14,5 @@ ifneq ($(CONFIG_ARCH_MSM),)
>  endif
>  
>  ifneq ($(CONFIG_ARCH_MXC),)
> -	obj-$(CONFIG_USB_CHIPIDEA)	+= phy-imx-utmi.o
> +	obj-$(CONFIG_USB_CHIPIDEA)	+= phy-imx-utmi.o ci13xxx_imx.o
>  endif
> diff --git a/drivers/usb/chipidea/ci13xxx_imx.c b/drivers/usb/chipidea/ci13xxx_imx.c
> new file mode 100644
> index 0000000..5f36f07
> --- /dev/null
> +++ b/drivers/usb/chipidea/ci13xxx_imx.c
> @@ -0,0 +1,177 @@
> +/*
> + * Copyright 2012 Freescale Semiconductor, Inc.
> + *
> + * The code contained herein is licensed under the GNU General Public
> + * License. You may obtain a copy of the GNU General Public License
> + * Version 2 or later at the following locations:
> + *
> + * http://www.opensource.org/licenses/gpl-license.html
> + * http://www.gnu.org/copyleft/gpl.html
> + */
> +
> +#include <linux/module.h>
> +#include <linux/platform_device.h>
> +#include <linux/of_platform.h>
> +#include <linux/of_gpio.h>
> +#include <linux/pm_runtime.h>
> +#include <linux/usb/ulpi.h>
> +#include <linux/usb/gadget.h>
> +#include <linux/usb/chipidea.h>
> +#include <linux/usb/otg.h>
> +#include <linux/dma-mapping.h>
> +
> +#include "ci.h"
> +
> +#define pdev_to_phy(pdev) \
> +	((struct usb_phy *)platform_get_drvdata(pdev))
> +
> +static void ci13xxx_imx_notify_event(struct ci13xxx *udc, unsigned event)
> +{
> +#if 0
> +	struct device *dev = udc->gadget.dev.parent;
> +	int val;
> +
> +	switch (event) {
> +	case CI13XXX_CONTROLLER_RESET_EVENT:
> +		dev_dbg(dev, "CI13XXX_CONTROLLER_RESET_EVENT received\n");
> +		writel(0, USB_AHBBURST);
> +		writel(0, USB_AHBMODE);
> +		break;
> +	case CI13XXX_CONTROLLER_STOPPED_EVENT:
> +		dev_dbg(dev, "CI13XXX_CONTROLLER_STOPPED_EVENT received\n");
> +		/*
> +		 * Put the transceiver in non-driving mode. Otherwise host
> +		 * may not detect soft-disconnection.
> +		 */
> +		val = usb_phy_io_read(udc->transceiver, ULPI_FUNC_CTRL);
> +		val &= ~ULPI_FUNC_CTRL_OPMODE_MASK;
> +		val |= ULPI_FUNC_CTRL_OPMODE_NONDRIVING;
> +		usb_phy_io_write(udc->transceiver, val, ULPI_FUNC_CTRL);
> +		break;
> +	default:
> +		dev_dbg(dev, "unknown ci13xxx_udc event\n");
> +		break;
> +	}
> +#endif
> +}
> +
> +static struct ci13xxx_udc_driver ci13xxx_imx_udc_driver = {
> +	.name			= "ci13xxx_imx",
> +	.flags			= CI13XXX_REGS_SHARED |
> +				  CI13XXX_PULLUP_ON_VBUS |
> +				  CI13XXX_DISABLE_STREAMING,
> +	.capoffset		= 0x100,

There's a DEF_CAPOFFSET for this in <linux/usb/chipidea.h>, because this
is really a single most popular offset of the capability registers in
chipidea controllers.

> +
> +	.notify_event		= ci13xxx_imx_notify_event,
> +};
> +
> +static int ci13xxx_imx_probe(struct platform_device *pdev)
> +{
> +	struct platform_device *plat_ci, *phy_pdev;
> +	struct device_node *phy_np;
> +	struct resource *res;
> +	int hub_reset, vbus_pwr;
> +	int ret;
> +
> +	dev_dbg(&pdev->dev, "ci13xxx_imx_probe\n");

Certain people don't take kindly to adding debug prints like this one. :)

> +
> +	phy_np = of_parse_phandle(pdev->dev.of_node, "fsl,usbphy", 0);
> +	if (phy_np) {
> +		phy_pdev = of_find_device_by_node(phy_np);
> +		if (phy_pdev) {
> +			struct usb_phy *phy;
> +			phy = pdev_to_phy(phy_pdev);
> +			if (phy)
> +				usb_phy_init(phy);
> +		}
> +		of_node_put(phy_np);
> +	}
> +
> +	hub_reset = of_get_named_gpio(pdev->dev.of_node, "fsl,hub-reset", 0);
> +	if (hub_reset > 0 &&
> +	    devm_gpio_request(&pdev->dev, hub_reset, "hub-reset")) {
> +		gpio_direction_output(hub_reset, 0);
> +		udelay(10);
> +		gpio_direction_output(hub_reset, 1);
> +	}
> +
> +	/* we only support host now, so enable vbus here */
> +	vbus_pwr = of_get_named_gpio(pdev->dev.of_node, "fsl,vbus-power", 0);
> +	if (vbus_pwr > 0 &&
> +	    devm_gpio_request(&pdev->dev, vbus_pwr, "vbus-pwr")) {
> +		gpio_direction_output(vbus_pwr, 1);
> +	}
> +
> +	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> +	if (!res) {
> +		dev_err(&pdev->dev, "can't get device resources\n");
> +		return -ENOENT;
> +	}
> +
> +	plat_ci = platform_device_alloc("ci_hdrc", (int)res->start);

Regarding the instance id here: you probably want to use something more
meaningful than the starting address. I was thinking about stealing id
allocator from Felipe's dwc3 (dwc3_get_device_id()), but decided to
first deal with more important things.

I was considering using idr for this, but it kind of feels like an
overkill for this purpose. So I'm wondering if it makes sense to
generalize dwc3_get_device_id() so that other drivers can make use of
it?

> +	if (!plat_ci) {
> +		dev_err(&pdev->dev, "can't allocate ci_hdrc platform device\n");
> +		return -ENOMEM;
> +	}
> +
> +	ret = platform_device_add_resources(plat_ci, pdev->resource,
> +					    pdev->num_resources);
> +	if (ret) {
> +		dev_err(&pdev->dev, "can't add resources to platform device\n");
> +		goto put_platform;
> +	}
> +
> +	ret = platform_device_add_data(plat_ci, &ci13xxx_imx_udc_driver,
> +				       sizeof(ci13xxx_imx_udc_driver));
> +	if (ret)
> +		goto put_platform;
> +
> +	plat_ci->dev.dma_mask =
> +		kmalloc(sizeof(*pdev->dev.dma_mask), GFP_KERNEL);
> +	if (!plat_ci->dev.dma_mask) {
> +		ret = -ENOMEM;
> +		goto put_platform;
> +	}
> +	*plat_ci->dev.dma_mask = DMA_BIT_MASK(32);
> +	plat_ci->dev.coherent_dma_mask = DMA_BIT_MASK(32);
> +
> +	ret = platform_device_add(plat_ci);
> +	if (ret)
> +		goto free_dma_mask;
> +
> +	pm_runtime_no_callbacks(&pdev->dev);
> +	pm_runtime_enable(&pdev->dev);
> +
> +	return 0;
> +
> +free_dma_mask:
> +	kfree(plat_ci->dev.dma_mask);
> +	plat_ci->dev.dma_mask = NULL;
> +put_platform:
> +	platform_device_put(plat_ci);
> +
> +	return ret;
> +}
> +
> +static const struct of_device_id ci13xxx_imx_dt_ids[] = {
> +	{ .compatible = "fsl,imx6q-usboh3", },
> +	{ /* sentinel */ }
> +};
> +
> +static struct platform_driver ci13xxx_imx_driver = {
> +	.probe = ci13xxx_imx_probe,
> +	.driver = {
> +		.name = "imx_usboh3",
> +		.of_match_table = ci13xxx_imx_dt_ids,
> +	 },
> +};
> +
> +MODULE_ALIAS("platform:imx_usboh3");
> +
> +static int __init ci13xxx_imx_init(void)
> +{
> +	return platform_driver_register(&ci13xxx_imx_driver);
> +}
> +module_init(ci13xxx_imx_init);
> +
> +MODULE_LICENSE("GPL v2");
> -- 
> 1.7.5.4
>
>
> --
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