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libpayload: Add support for split transactions in EHCI

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With split transactions, the EHCI host controller can handle full- and
low-speed devices on hubs in high-speed mode. This adds support for split
transactions for control and bulk transfers.

Change-Id: I30fa1ce25757f33b1e6ed34207949c9255f05d49
Signed-off-by: Nico Huber <nico.huber@secunet.com>
Reviewed-on: http://review.coreboot.org/1081
Tested-by: build bot (Jenkins)
Reviewed-by: Stefan Reinauer <stefan.reinauer@coreboot.org>
This commit is contained in:
Nico Huber
2012-05-23 09:21:54 +02:00
committed by Stefan Reinauer
parent d5d024f3e5
commit 1ab6075320
4 changed files with 53 additions and 12 deletions
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49
payloads/libpayload/drivers/usb/ehci.c
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@@ -61,6 +61,30 @@ static void ehci_shutdown (hci_t *controller)
enum { EHCI_OUT=0, EHCI_IN=1, EHCI_SETUP=2 };
/*
* returns the address of the closest USB2.0 hub, which is responsible for
* split transactions, along with the number of the used downstream port
*/
static 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;
} else {
debug("ehci: Couldn't find closest USB2.0 hub.\n");
return 1;
}
}
/* returns handled bytes. assumes that the fields it writes are empty on entry */
static int fill_td(qtd_t *td, void* data, int datalen)
{
@@ -140,6 +164,13 @@ static int ehci_bulk (endpoint_t *ep, int size, u8 *data, int finalize)
int endp = ep->endpoint & 0xf;
int pid = (ep->direction==IN)?EHCI_IN:EHCI_OUT;
int hubaddr = 0, hubport = 0;
if (ep->dev->speed < 2) {
/* we need a split transaction */
if (closest_usb2_hub(ep->dev, &hubaddr, &hubport))
return 1;
}
qtd_t *head = memalign(32, sizeof(qtd_t));
qtd_t *cur = head;
while (1) {
@@ -173,7 +204,9 @@ static int ehci_bulk (endpoint_t *ep, int size, u8 *data, int finalize)
(1 << QH_RECLAIM_HEAD_SHIFT) |
(ep->maxpacketsize << QH_MPS_SHIFT) |
(0 << QH_NAK_CNT_SHIFT);
qh->epcaps = 3 << QH_PIPE_MULTIPLIER_SHIFT;
qh->epcaps = (3 << QH_PIPE_MULTIPLIER_SHIFT) |
(hubport << QH_PORT_NUMBER_SHIFT) |
(hubaddr << QH_HUB_ADDRESS_SHIFT);
qh->td.next_qtd = virt_to_phys(head);
qh->td.token |= (ep->toggle?QTD_TOGGLE_DATA1:0);
@@ -209,6 +242,14 @@ static int ehci_control (usbdev_t *dev, direction_t dir, int drlen, void *devreq
int mlen = dev->endpoints[0].maxpacketsize;
int result = 0;
int hubaddr = 0, hubport = 0, non_hs_ctrl_ep = 0;
if (dev->speed < 2) {
/* we need a split transaction */
if (closest_usb2_hub(dev, &hubaddr, &hubport))
return 1;
non_hs_ctrl_ep = 1;
}
/* create qTDs */
qtd_t *head = memalign(32, sizeof(qtd_t));
qtd_t *cur = head;
@@ -263,9 +304,11 @@ static int ehci_control (usbdev_t *dev, direction_t dir, int drlen, void *devreq
(1 << QH_DTC_SHIFT) | /* ctrl transfers are special: take toggle bit from TD */
(1 << QH_RECLAIM_HEAD_SHIFT) |
(mlen << QH_MPS_SHIFT) |
(0 << QH_NON_HS_CTRL_EP_SHIFT) | /* no non-HS device support yet */
(non_hs_ctrl_ep << QH_NON_HS_CTRL_EP_SHIFT) |
(0 << QH_NAK_CNT_SHIFT);
qh->epcaps = 3 << QH_PIPE_MULTIPLIER_SHIFT;
qh->epcaps = (3 << QH_PIPE_MULTIPLIER_SHIFT) |
(hubport << QH_PORT_NUMBER_SHIFT) |
(hubaddr << QH_HUB_ADDRESS_SHIFT);
qh->td.next_qtd = virt_to_phys(head);
/* hook up QH */