void usbhs_pipe_set_trans_count_if_bulk(struct usbhs_pipe *pipe, int len)
{
if (!usbhs_pipe_type_is(pipe, USB_ENDPOINT_XFER_BULK))
return;
/*
* clear and disable transfer counter for IN/OUT pipe
*/
usbhsp_pipe_tre_set(pipe, TRCLR | TRENB, TRCLR);
/*
* Only IN direction bulk pipe can use transfer count.
* Without using this function,
* received data will break if it was large data size.
* see PIPEnTRN/PIPEnTRE for detail
*/
if (usbhs_pipe_is_dir_in(pipe)) {
int maxp = usbhs_pipe_get_maxpacket(pipe);
usbhsp_pipe_trn_set(pipe, 0xffff, DIV_ROUND_UP(len, maxp));
usbhsp_pipe_tre_set(pipe, TRENB, TRENB); /* enable */
}
}
static int usbhsh_pipe_attach(struct usbhsh_hpriv *hpriv,
struct urb *urb)
{
struct usbhs_priv *priv = usbhsh_hpriv_to_priv(hpriv);
struct usbhsh_ep *uep = usbhsh_ep_to_uep(urb->ep);
struct usbhsh_device *udev = usbhsh_device_get(hpriv, urb);
struct usbhs_pipe *pipe;
struct usb_endpoint_descriptor *desc = &urb->ep->desc;
struct device *dev = usbhs_priv_to_dev(priv);
unsigned long flags;
int dir_in_req = !!usb_pipein(urb->pipe);
int is_dcp = usb_endpoint_xfer_control(desc);
int i, dir_in;
int ret = -EBUSY;
/******************** spin lock ********************/
usbhs_lock(priv, flags);
/*
* if uep has been attached to pipe,
* reuse it
*/
if (usbhsh_uep_to_pipe(uep)) {
ret = 0;
goto usbhsh_pipe_attach_done;
}
usbhs_for_each_pipe_with_dcp(pipe, priv, i) {
/* check pipe type */
if (!usbhs_pipe_type_is(pipe, usb_endpoint_type(desc)))
continue;
/* check pipe direction if normal pipe */
if (!is_dcp) {
dir_in = !!usbhs_pipe_is_dir_in(pipe);
if (0 != (dir_in - dir_in_req))
continue;
}
/* check pipe is free */
if (usbhsh_pipe_to_uep(pipe))
continue;
/*
* attach pipe to uep
*
* usbhs_pipe_config_update() should be called after
* usbhs_set_device_config()
* see
* DCPMAXP/PIPEMAXP
*/
usbhsh_uep_to_pipe(uep) = pipe;
usbhsh_pipe_to_uep(pipe) = uep;
usbhs_pipe_config_update(pipe,
usbhsh_device_number(hpriv, udev),
usb_endpoint_num(desc),
usb_endpoint_maxp(desc));
dev_dbg(dev, "%s [%d-%d(%s:%s)]\n", __func__,
usbhsh_device_number(hpriv, udev),
usb_endpoint_num(desc),
usbhs_pipe_name(pipe),
dir_in_req ? "in" : "out");
ret = 0;
break;
}
usbhsh_pipe_attach_done:
if (0 == ret)
uep->counter++;
usbhs_unlock(priv, flags);
/******************** spin unlock ******************/
return ret;
}
