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libpayload: usb: dwc2: support split transaction

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With split transaction, dwc2 host controller can handle full- and
low-speed devices on hub in high-speed mode. This commit adds support
for split control and interrupt transfers

BUG=None
TEST=Connect usb keyboard through hub, usb keyboard can work
BRANCH=None

Change-Id: If7a00db21c8ad4c635f39581382b877603075d1a
Signed-off-by: Patrick Georgi <pgeorgi@chromium.org>
Original-Commit-Id: 4fb514b7f7f7e414fa94bfce05420957b1c57019
Original-Change-Id: I07e64064c6182d33905ae4efb13712645de7cf93
Original-Signed-off-by: Yunzhi Li <lyz@rock-chips.com>
Original-Reviewed-on: https://chromium-review.googlesource.com/283282
Original-Tested-by: Lin Huang <hl@rock-chips.com>
Original-Commit-Queue: Lin Huang <hl@rock-chips.com>
Original-Reviewed-by: Julius Werner <jwerner@chromium.org>
Reviewed-on: http://review.coreboot.org/10956
Tested-by: build bot (Jenkins)
Reviewed-by: Stefan Reinauer <stefan.reinauer@coreboot.org>
This commit is contained in:
Yunzhi Li
2015-07-02 15:28:11 +08:00
committed by Patrick Georgi
parent ae3d71a4d1
commit ebd3da7dba
6 changed files with 182 additions and 36 deletions
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26
payloads/libpayload/drivers/usb/usb.c
View File

@ -653,3 +653,29 @@ usb_generic_init (usbdev_t *dev)
usb_detach_device(dev->controller, dev->address);
}
}
/*
* returns the address of the closest USB2.0 hub, which is responsible for
* split transactions, along with the number of the used downstream port
*/
int closest_usb2_hub(const usbdev_t *dev, int *const addr, int *const port)
{
const usbdev_t *usb1dev;
do {
usb1dev = dev;
if ((dev->hub >= 0) && (dev->hub < 128))
dev = dev->controller->devices[dev->hub];
else
dev = NULL;
} while (dev && (dev->speed < 2));
if (dev) {
*addr = usb1dev->hub;
*port = usb1dev->port;
return 0;
}
usb_debug("Couldn't find closest USB2.0 hub.\n");
return 1;
}