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https://github.com/brain-hackers/u-boot-brain
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![Michal Simek](/assets/img/avatar_default.png)
Cast u32 bit value to 64bit before recasting to 64bit pointer to avoid pointer from integer cast size mismatch warnings. Warning log: +../drivers/usb/gadget/udc/udc-core.c: In function ‘usb_gadget_unmap_request’: +../drivers/usb/gadget/udc/udc-core.c:68:19: warning: cast to pointer from integer of different size [-Wint-to-pointer-cast] Signed-off-by: Michal Simek <michal.simek@xilinx.com>
355 lines
8.7 KiB
C
355 lines
8.7 KiB
C
/**
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* udc-core.c - Core UDC Framework
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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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* Taken from Linux Kernel v3.19-rc1 (drivers/usb/gadget/udc-core.c) and ported
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* to uboot.
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*
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* commit 02e8c96627 : usb: gadget: udc: core: prepend udc_attach_driver with
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* usb_
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*
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* SPDX-License-Identifier: GPL-2.0
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*/
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#include <linux/compat.h>
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#include <malloc.h>
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#include <asm/cache.h>
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#include <asm/dma-mapping.h>
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#include <common.h>
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#include <linux/usb/ch9.h>
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#include <linux/usb/gadget.h>
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/**
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* struct usb_udc - describes one usb device controller
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* @driver - the gadget driver pointer. For use by the class code
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* @dev - the child device to the actual controller
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* @gadget - the gadget. For use by the class code
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* @list - for use by the udc class driver
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*
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* This represents the internal data structure which is used by the UDC-class
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* to hold information about udc driver and gadget together.
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*/
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struct usb_udc {
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struct usb_gadget_driver *driver;
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struct usb_gadget *gadget;
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struct device dev;
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struct list_head list;
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};
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static struct class *udc_class;
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static LIST_HEAD(udc_list);
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DEFINE_MUTEX(udc_lock);
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/* ------------------------------------------------------------------------- */
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int usb_gadget_map_request(struct usb_gadget *gadget,
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struct usb_request *req, int is_in)
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{
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if (req->length == 0)
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return 0;
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req->dma = dma_map_single(req->buf, req->length,
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is_in ? DMA_TO_DEVICE : DMA_FROM_DEVICE);
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return 0;
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}
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EXPORT_SYMBOL_GPL(usb_gadget_map_request);
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void usb_gadget_unmap_request(struct usb_gadget *gadget,
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struct usb_request *req, int is_in)
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{
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if (req->length == 0)
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return;
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dma_unmap_single((void *)(uintptr_t)req->dma, req->length,
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is_in ? DMA_TO_DEVICE : DMA_FROM_DEVICE);
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}
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EXPORT_SYMBOL_GPL(usb_gadget_unmap_request);
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/* ------------------------------------------------------------------------- */
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/**
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* usb_gadget_giveback_request - give the request back to the gadget layer
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* Context: in_interrupt()
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*
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* This is called by device controller drivers in order to return the
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* completed request back to the gadget layer.
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*/
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void usb_gadget_giveback_request(struct usb_ep *ep,
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struct usb_request *req)
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{
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req->complete(ep, req);
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}
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EXPORT_SYMBOL_GPL(usb_gadget_giveback_request);
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/* ------------------------------------------------------------------------- */
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void usb_gadget_set_state(struct usb_gadget *gadget,
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enum usb_device_state state)
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{
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gadget->state = state;
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}
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EXPORT_SYMBOL_GPL(usb_gadget_set_state);
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/* ------------------------------------------------------------------------- */
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/**
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* usb_gadget_udc_reset - notifies the udc core that bus reset occurs
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* @gadget: The gadget which bus reset occurs
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* @driver: The gadget driver we want to notify
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*
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* If the udc driver has bus reset handler, it needs to call this when the bus
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* reset occurs, it notifies the gadget driver that the bus reset occurs as
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* well as updates gadget state.
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*/
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void usb_gadget_udc_reset(struct usb_gadget *gadget,
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struct usb_gadget_driver *driver)
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{
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driver->reset(gadget);
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usb_gadget_set_state(gadget, USB_STATE_DEFAULT);
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}
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EXPORT_SYMBOL_GPL(usb_gadget_udc_reset);
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/**
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* usb_gadget_udc_start - tells usb device controller to start up
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* @udc: The UDC to be started
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*
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* This call is issued by the UDC Class driver when it's about
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* to register a gadget driver to the device controller, before
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* calling gadget driver's bind() method.
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*
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* It allows the controller to be powered off until strictly
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* necessary to have it powered on.
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*
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* Returns zero on success, else negative errno.
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*/
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static inline int usb_gadget_udc_start(struct usb_udc *udc)
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{
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return udc->gadget->ops->udc_start(udc->gadget, udc->driver);
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}
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/**
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* usb_gadget_udc_stop - tells usb device controller we don't need it anymore
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* @gadget: The device we want to stop activity
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* @driver: The driver to unbind from @gadget
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*
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* This call is issued by the UDC Class driver after calling
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* gadget driver's unbind() method.
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*
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* The details are implementation specific, but it can go as
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* far as powering off UDC completely and disable its data
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* line pullups.
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*/
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static inline void usb_gadget_udc_stop(struct usb_udc *udc)
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{
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udc->gadget->ops->udc_stop(udc->gadget);
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}
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/**
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* usb_udc_release - release the usb_udc struct
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* @dev: the dev member within usb_udc
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*
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* This is called by driver's core in order to free memory once the last
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* reference is released.
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*/
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static void usb_udc_release(struct device *dev)
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{
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struct usb_udc *udc;
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udc = container_of(dev, struct usb_udc, dev);
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kfree(udc);
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}
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/**
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* usb_add_gadget_udc_release - adds a new gadget to the udc class driver list
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* @parent: the parent device to this udc. Usually the controller driver's
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* device.
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* @gadget: the gadget to be added to the list.
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* @release: a gadget release function.
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*
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* Returns zero on success, negative errno otherwise.
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*/
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int usb_add_gadget_udc_release(struct device *parent, struct usb_gadget *gadget,
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void (*release)(struct device *dev))
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{
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struct usb_udc *udc;
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int ret = -ENOMEM;
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udc = kzalloc(sizeof(*udc), GFP_KERNEL);
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if (!udc)
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goto err1;
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dev_set_name(&gadget->dev, "gadget");
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gadget->dev.parent = parent;
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udc->dev.release = usb_udc_release;
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udc->dev.class = udc_class;
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udc->dev.parent = parent;
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udc->gadget = gadget;
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mutex_lock(&udc_lock);
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list_add_tail(&udc->list, &udc_list);
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usb_gadget_set_state(gadget, USB_STATE_NOTATTACHED);
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mutex_unlock(&udc_lock);
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return 0;
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err1:
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return ret;
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}
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EXPORT_SYMBOL_GPL(usb_add_gadget_udc_release);
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/**
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* usb_add_gadget_udc - adds a new gadget to the udc class driver list
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* @parent: the parent device to this udc. Usually the controller
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* driver's device.
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* @gadget: the gadget to be added to the list
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*
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* Returns zero on success, negative errno otherwise.
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*/
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int usb_add_gadget_udc(struct device *parent, struct usb_gadget *gadget)
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{
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return usb_add_gadget_udc_release(parent, gadget, NULL);
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}
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EXPORT_SYMBOL_GPL(usb_add_gadget_udc);
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static void usb_gadget_remove_driver(struct usb_udc *udc)
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{
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dev_dbg(&udc->dev, "unregistering UDC driver [%s]\n",
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udc->driver->function);
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usb_gadget_disconnect(udc->gadget);
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udc->driver->disconnect(udc->gadget);
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udc->driver->unbind(udc->gadget);
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usb_gadget_udc_stop(udc);
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udc->driver = NULL;
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}
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/**
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* usb_del_gadget_udc - deletes @udc from udc_list
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* @gadget: the gadget to be removed.
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*
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* This, will call usb_gadget_unregister_driver() if
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* the @udc is still busy.
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*/
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void usb_del_gadget_udc(struct usb_gadget *gadget)
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{
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struct usb_udc *udc = NULL;
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mutex_lock(&udc_lock);
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list_for_each_entry(udc, &udc_list, list)
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if (udc->gadget == gadget)
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goto found;
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dev_err(gadget->dev.parent, "gadget not registered.\n");
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mutex_unlock(&udc_lock);
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return;
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found:
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dev_vdbg(gadget->dev.parent, "unregistering gadget\n");
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list_del(&udc->list);
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mutex_unlock(&udc_lock);
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if (udc->driver)
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usb_gadget_remove_driver(udc);
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}
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EXPORT_SYMBOL_GPL(usb_del_gadget_udc);
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/* ------------------------------------------------------------------------- */
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static int udc_bind_to_driver(struct usb_udc *udc, struct usb_gadget_driver *driver)
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{
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int ret;
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dev_dbg(&udc->dev, "registering UDC driver [%s]\n",
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driver->function);
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udc->driver = driver;
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ret = driver->bind(udc->gadget);
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if (ret)
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goto err1;
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ret = usb_gadget_udc_start(udc);
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if (ret) {
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driver->unbind(udc->gadget);
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goto err1;
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}
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usb_gadget_connect(udc->gadget);
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return 0;
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err1:
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if (ret != -EISNAM)
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dev_err(&udc->dev, "failed to start %s: %d\n",
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udc->driver->function, ret);
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udc->driver = NULL;
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return ret;
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}
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int usb_gadget_probe_driver(struct usb_gadget_driver *driver)
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{
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struct usb_udc *udc = NULL;
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int ret;
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if (!driver || !driver->bind || !driver->setup)
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return -EINVAL;
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mutex_lock(&udc_lock);
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list_for_each_entry(udc, &udc_list, list) {
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/* For now we take the first one */
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if (!udc->driver)
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goto found;
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}
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printf("couldn't find an available UDC\n");
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mutex_unlock(&udc_lock);
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return -ENODEV;
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found:
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ret = udc_bind_to_driver(udc, driver);
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mutex_unlock(&udc_lock);
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return ret;
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}
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EXPORT_SYMBOL_GPL(usb_gadget_probe_driver);
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int usb_gadget_register_driver(struct usb_gadget_driver *driver)
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{
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return usb_gadget_probe_driver(driver);
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}
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EXPORT_SYMBOL_GPL(usb_gadget_register_driver);
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int usb_gadget_unregister_driver(struct usb_gadget_driver *driver)
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{
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struct usb_udc *udc = NULL;
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int ret = -ENODEV;
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if (!driver || !driver->unbind)
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return -EINVAL;
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mutex_lock(&udc_lock);
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list_for_each_entry(udc, &udc_list, list)
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if (udc->driver == driver) {
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usb_gadget_remove_driver(udc);
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usb_gadget_set_state(udc->gadget,
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USB_STATE_NOTATTACHED);
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ret = 0;
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break;
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}
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mutex_unlock(&udc_lock);
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return ret;
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}
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EXPORT_SYMBOL_GPL(usb_gadget_unregister_driver);
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MODULE_DESCRIPTION("UDC Framework");
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MODULE_AUTHOR("Felipe Balbi <balbi@ti.com>");
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MODULE_LICENSE("GPL v2");
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