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usb: gadget: udc: core: add usb_gadget_{un}map_request_by_dev()

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If the following environment, the first argument of DMA API should
be set to a DMAC's device structure, not a udc controller's one.
 - A udc controller needs an external DMAC device (like a DMA Engine).
 - The external DMAC enables IOMMU.

So, this patch add usb_gadget_{un}map_request_by_dev() API to set
a DMAC's device structure by a udc controller driver.

Signed-off-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>
Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>
This commit is contained in:
Yoshihiro Shimoda 2016-04-18 16:53:39 +09:00 committed by Felipe Balbi
parent 5096c4d3bf
commit 679ca39fc6
2 changed files with 22 additions and 6 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

24
drivers/usb/gadget/udc/udc-core.c
View file

@ -61,11 +61,9 @@ static int udc_bind_to_driver(struct usb_udc *udc,
#ifdef CONFIG_HAS_DMA
int usb_gadget_map_request(struct usb_gadget *gadget,
int usb_gadget_map_request_by_dev(struct device *dev,
struct usb_request *req, int is_in)
{
struct device *dev = gadget->dev.parent;
if (req->length == 0)
return 0;
@ -92,24 +90,38 @@ int usb_gadget_map_request(struct usb_gadget *gadget,
return 0;
}
EXPORT_SYMBOL_GPL(usb_gadget_map_request_by_dev);
int usb_gadget_map_request(struct usb_gadget *gadget,
struct usb_request *req, int is_in)
{
return usb_gadget_map_request_by_dev(gadget->dev.parent, req, is_in);
}
EXPORT_SYMBOL_GPL(usb_gadget_map_request);
void usb_gadget_unmap_request(struct usb_gadget *gadget,
void usb_gadget_unmap_request_by_dev(struct device *dev,
struct usb_request *req, int is_in)
{
if (req->length == 0)
return;
if (req->num_mapped_sgs) {
dma_unmap_sg(gadget->dev.parent, req->sg, req->num_mapped_sgs,
dma_unmap_sg(dev, req->sg, req->num_mapped_sgs,
is_in ? DMA_TO_DEVICE : DMA_FROM_DEVICE);
req->num_mapped_sgs = 0;
} else {
dma_unmap_single(gadget->dev.parent, req->dma, req->length,
dma_unmap_single(dev, req->dma, req->length,
is_in ? DMA_TO_DEVICE : DMA_FROM_DEVICE);
}
}
EXPORT_SYMBOL_GPL(usb_gadget_unmap_request_by_dev);
void usb_gadget_unmap_request(struct usb_gadget *gadget,
struct usb_request *req, int is_in)
{
usb_gadget_unmap_request_by_dev(gadget->dev.parent, req, is_in);
}
EXPORT_SYMBOL_GPL(usb_gadget_unmap_request);
#endif /* CONFIG_HAS_DMA */

4
include/linux/usb/gadget.h
View file

@ -1223,9 +1223,13 @@ int usb_otg_descriptor_init(struct usb_gadget *gadget,
/* utility to simplify map/unmap of usb_requests to/from DMA */
extern int usb_gadget_map_request_by_dev(struct device *dev,
struct usb_request *req, int is_in);
extern int usb_gadget_map_request(struct usb_gadget *gadget,
struct usb_request *req, int is_in);
extern void usb_gadget_unmap_request_by_dev(struct device *dev,
struct usb_request *req, int is_in);
extern void usb_gadget_unmap_request(struct usb_gadget *gadget,
struct usb_request *req, int is_in);