[U-Boot] [PATCH v2 3/6] usb: dwc3: Add generic DWC3 glue logic driver

[Jean-Jacques Hiblot <jjhiblot@ti.com>]

On 18/05/2018 13:15, Michal Simek wrote:
> By enabling BLK by default this is the next driver which needs to get
> support for DM_USB. Adding generic DWC3 glue logic which only
> parse nodes and read device mode. Based on it probe proper
> host/peripheral DWC3 drivers for it.
>
> Signed-off-by: Michal Simek <michal.simek@xilinx.com>
> ---
>
> Changes in v2:
> - Change style to avoid correct but not nice indentation by using char
>    *driver variable (suggested by Marek)
>
>   drivers/usb/dwc3/Kconfig        |   6 ++
>   drivers/usb/dwc3/Makefile       |   1 +
>   drivers/usb/dwc3/dwc3-generic.c | 157 ++++++++++++++++++++++++++++++++
>   3 files changed, 164 insertions(+)
>   create mode 100644 drivers/usb/dwc3/dwc3-generic.c
>
> diff --git a/drivers/usb/dwc3/Kconfig b/drivers/usb/dwc3/Kconfig
> index ae7fc1c6304d..943b7630eba4 100644
> --- a/drivers/usb/dwc3/Kconfig
> +++ b/drivers/usb/dwc3/Kconfig
> @@ -37,6 +37,12 @@ config USB_DWC3_OMAP
>   
>   	  Say 'Y' here if you have one such device
>   
> +config USB_DWC3_GENERIC
> +	bool "Xilinx ZynqMP and similar Platforms"
> +	depends on DM_USB && USB_DWC3
> +	help
> +	  Some platforms can reuse this DWC3 generic implementation.
> +
>   config USB_DWC3_UNIPHIER
>   	bool "DesignWare USB3 Host Support on UniPhier Platforms"
>   	depends on ARCH_UNIPHIER && USB_XHCI_DWC3
> diff --git a/drivers/usb/dwc3/Makefile b/drivers/usb/dwc3/Makefile
> index cd18b8d9ec02..60b5515a67da 100644
> --- a/drivers/usb/dwc3/Makefile
> +++ b/drivers/usb/dwc3/Makefile
> @@ -7,6 +7,7 @@ dwc3-y					:= core.o
>   obj-$(CONFIG_USB_DWC3_GADGET)		+= gadget.o ep0.o
>   
>   obj-$(CONFIG_USB_DWC3_OMAP)		+= dwc3-omap.o
> +obj-$(CONFIG_USB_DWC3_GENERIC)		+= dwc3-generic.o
>   obj-$(CONFIG_USB_DWC3_UNIPHIER)		+= dwc3-uniphier.o
>   obj-$(CONFIG_USB_DWC3_PHY_OMAP)		+= ti_usb_phy.o
>   obj-$(CONFIG_USB_DWC3_PHY_SAMSUNG)	+= samsung_usb_phy.o
> diff --git a/drivers/usb/dwc3/dwc3-generic.c b/drivers/usb/dwc3/dwc3-generic.c
> new file mode 100644
> index 000000000000..ca63eac3d98e
> --- /dev/null
> +++ b/drivers/usb/dwc3/dwc3-generic.c
> @@ -0,0 +1,157 @@
> +// SPDX-License-Identifier:     GPL-2.0
> +/*
> + * Generic DWC3 Glue layer
> + *
> + * Copyright (C) 2016 - 2018 Xilinx, Inc.
> + *
> + * Based on dwc3-omap.c.
> + */
> +
> +#include <common.h>
> +#include <dm.h>
> +#include <dm/device-internal.h>
> +#include <dm/lists.h>
> +#include <linux/usb/otg.h>
> +#include <linux/compat.h>
> +#include <linux/usb/ch9.h>
> +#include <linux/usb/gadget.h>
> +#include <malloc.h>
> +#include <usb.h>
> +#include "core.h"
> +#include "gadget.h"
> +#include "linux-compat.h"
> +
> +DECLARE_GLOBAL_DATA_PTR;
> +
> +int usb_gadget_handle_interrupts(int index)
> +{
> +	struct dwc3 *priv;
> +	struct udevice *dev;
> +	int ret;
> +
> +	ret = uclass_first_device(UCLASS_USB_DEV_GENERIC, &dev);
> +	if (!dev || ret) {
> +		pr_err("No USB device found\n");
> +		return -ENODEV;
> +	}
> +
> +	priv = dev_get_priv(dev);
> +
> +	dwc3_gadget_uboot_handle_interrupt(priv);
> +
> +	return 0;
> +}
> +
> +static int dwc3_generic_peripheral_probe(struct udevice *dev)
> +{
> +	struct dwc3 *priv = dev_get_priv(dev);
> +
> +	return dwc3_init(priv);
> +}
> +
> +static int dwc3_generic_peripheral_remove(struct udevice *dev)
> +{
> +	struct dwc3 *priv = dev_get_priv(dev);
> +
> +	dwc3_remove(priv);
> +
> +	return 0;
> +}
> +
> +static int dwc3_generic_peripheral_ofdata_to_platdata(struct udevice *dev)
> +{
> +	struct dwc3 *priv = dev_get_priv(dev);
> +	int node = dev_of_offset(dev);
> +
> +	priv->regs = (void *)devfdt_get_addr(dev);
> +	priv->regs += DWC3_GLOBALS_REGS_START;
> +
> +	priv->maximum_speed = usb_get_maximum_speed(node);
> +	if (priv->maximum_speed == USB_SPEED_UNKNOWN) {
> +		pr_err("Invalid usb maximum speed\n");
> +		return -ENODEV;
> +	}
> +
> +	priv->dr_mode = usb_get_dr_mode(node);
> +	if (priv->dr_mode == USB_DR_MODE_UNKNOWN) {
> +		pr_err("Invalid usb mode setup\n");
> +		return -ENODEV;
> +	}
> +
> +	return 0;
> +}
> +
> +static int dwc3_generic_peripheral_bind(struct udevice *dev)
> +{
> +	return device_probe(dev);
This is wrong place to probe the device.
What must be done is to probe the device when it is first used.
I have a patch in progress for this. When it's cleaned up I'll share a 
repo so that you can have look and maybe pick it up.
> +}
> +
> +U_BOOT_DRIVER(dwc3_generic_peripheral) = {
> +	.name	= "dwc3-generic-peripheral",
> +	.id	= UCLASS_USB_DEV_GENERIC,
> +	.ofdata_to_platdata = dwc3_generic_peripheral_ofdata_to_platdata,
> +	.probe = dwc3_generic_peripheral_probe,
> +	.remove = dwc3_generic_peripheral_remove,
> +	.bind = dwc3_generic_peripheral_bind,
> +	.platdata_auto_alloc_size = sizeof(struct usb_platdata),
> +	.priv_auto_alloc_size = sizeof(struct dwc3),
> +	.flags	= DM_FLAG_ALLOC_PRIV_DMA,
> +};
> +
> +static int dwc3_generic_bind(struct udevice *parent)
> +{
> +	const void *fdt = gd->fdt_blob;
> +	int node;
> +	int ret;
> +
> +	for (node = fdt_first_subnode(fdt, dev_of_offset(parent)); node > 0;
> +	     node = fdt_next_subnode(fdt, node)) {
> +		const char *name = fdt_get_name(fdt, node, NULL);
> +		enum usb_dr_mode dr_mode;
> +		struct udevice *dev;
> +		const char *driver;
> +
> +		debug("%s: subnode name: %s\n", __func__, name);
> +		if (strncmp(name, "dwc3@", 4))
> +			continue;
> +
> +		dr_mode = usb_get_dr_mode(node);
> +
> +		switch (dr_mode) {
> +		case USB_DR_MODE_PERIPHERAL:
> +		case USB_DR_MODE_OTG:
> +			debug("%s: dr_mode: OTG or Peripheral\n", __func__);
> +			driver = "dwc3-generic-peripheral";
> +			break;
> +		case USB_DR_MODE_HOST:
> +			debug("%s: dr_mode: HOST\n", __func__);
> +			driver = "dwc3-generic-host";
> +			break;
> +		default:
> +			debug("%s: unsupported dr_mode\n", __func__);
> +			return -ENODEV;
> +		};
> +
> +		ret = device_bind_driver_to_node(parent, driver, name,
> +						 offset_to_ofnode(node), &dev);
> +		if (ret) {
> +			debug("%s: not able to bind usb device mode\n",
> +			      __func__);
> +			return ret;
> +		}
> +	}
> +
> +	return 0;
> +}
> +
> +static const struct udevice_id dwc3_generic_ids[] = {
> +	{ .compatible = "xlnx,zynqmp-dwc3" },
> +	{ }
> +};
> +
> +U_BOOT_DRIVER(dwc3_generic_wrapper) = {
> +	.name	= "dwc3-generic-wrapper",
> +	.id	= UCLASS_MISC,
> +	.of_match = dwc3_generic_ids,
> +	.bind = dwc3_generic_bind,
> +};