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libpayload: Enforce strict packet handling order in ChipIdea driver 

First handle IN packets, then OUT packets and finally SETUP packets.
This makes OS X happy. It isn't implemented as the data sheet recommends
but it avoids implementing a state machine and should always produce
observable effects identical to that of the stateful solution.

BRANCH=none
BUG=none
TEST=`fastboot getvar version` on OSX works

Change-Id: Ic7b27387771d6a7794fba12fc822fccc48770ea8
Signed-off-by: Patrick Georgi <pgeorgi@chromium.org>
Original-Commit-Id: f0e59547519d50b1d34f6abdc6132330125f94f3
Original-Change-Id: Iada1cff011f11e7d5cb1a1b34896ab590f488ec7
Original-Signed-off-by: Patrick Georgi <pgeorgi@chromium.org>
Original-Reviewed-on: https://chromium-review.googlesource.com/258062
Original-Reviewed-by: Furquan Shaikh <furquan@chromium.org>
Reviewed-on: http://review.coreboot.org/9788
Tested-by: build bot (Jenkins)
Reviewed-by: Stefan Reinauer <stefan.reinauer@coreboot.org>
This commit is contained in:
Patrick Georgi 2015-03-10 12:51:31 +01:00
parent 49a80ce475
commit e17d57ecab
1 changed files with 41 additions and 17 deletions
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58
payloads/libpayload/drivers/udc/chipidea.c
View File

@ -359,8 +359,47 @@ static int chipidea_poll(struct usbdev_ctrl *this)
} }
if (sts & (USBSTS_UEI | USBSTS_UI)) { if (sts & (USBSTS_UEI | USBSTS_UI)) {
uint32_t bitmap = readl(&p->opreg->epsetupstat); uint32_t bitmap;
int ep = 0; int ep;
/* This slightly deviates from the recommendation in the
* data sheets, but the strict ordering is to simplify
* handling control transfers, which are initialized in
* the third step with a SETUP packet, then proceed in
* the next poll loop with in transfers (either data or
* status phase), then optionally out transfers (status
* phase).
*/
/* in transfers */
bitmap = (readl(&p->opreg->epcomplete) >> 16) & 0xffff;
ep = 0;
while (bitmap) {
if (bitmap & 1) {
debug("incoming packet on EP %d (in)\n", ep);
handle_endpoint(this, ep, 1);
clear_ep(p, ep & 0xf, 1);
}
bitmap >>= 1;
ep++;
}
/* out transfers */
bitmap = readl(&p->opreg->epcomplete) & 0xffff;
ep = 0;
while (bitmap) {
if (bitmap & 1) {
debug("incoming packet on EP %d (out)\n", ep);
handle_endpoint(this, ep, 0);
clear_ep(p, ep, 0);
}
bitmap >>= 1;
ep++;
}
/* setup transfers */
bitmap = readl(&p->opreg->epsetupstat);
ep = 0;
while (bitmap) { while (bitmap) {
if (bitmap & 1) { if (bitmap & 1) {
debug("incoming packet on EP %d (setup)\n", ep); debug("incoming packet on EP %d (setup)\n", ep);
@ -369,21 +408,6 @@ static int chipidea_poll(struct usbdev_ctrl *this)
bitmap >>= 1; bitmap >>= 1;
ep++; ep++;
} }
bitmap = readl(&p->opreg->epcomplete);
ep = 0;
int dir_in = 0;
while (bitmap) {
if (bitmap & 1) {
debug("incoming packet on EP %d (%s)\n",
ep, dir_in ? "intr/in" : "out");
handle_endpoint(this, ep & 0xf, dir_in);
clear_ep(p, ep & 0xf, dir_in);
}
bitmap >>= 1;
ep++;
if (ep == 16)
dir_in = 1;
}
} }
return 1; return 1;