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usbdebug: Use separate data toggle for each pipe 

USB defines a mechanism to detect certain cases of lost handshakes
using an alternating data sequence number, referred to as data
toggling. This patch fixes each pipe to have its own tracking of
the data toggle state.

Change-Id: I62420bdaeadd0842da3189428a37eeb10c646900
Signed-off-by: Kyösti Mälkki <kyosti.malkki@gmail.com>
Reviewed-on: http://review.coreboot.org/3865
Tested-by: build bot (Jenkins)
Reviewed-by: Aaron Durbin <adurbin@google.com>
This commit is contained in:
Kyösti Mälkki 2013-08-10 10:50:38 +03:00
parent 75d006232a
commit e29584c141
1 changed files with 27 additions and 20 deletions
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47
src/lib/usbdebug.c
View File

@ -41,6 +41,7 @@ struct dbgp_pipe
{
u8 devnum;
u8 endpoint;
u8 pid;
u8 status;
u8 bufidx;
char buf[8];
@ -69,10 +70,6 @@ static int dbgp_enabled(void);
#define USB_DEBUG_DEVNUM 127
#define DBGP_DATA_TOGGLE 0x8800
#define DBGP_PID_UPDATE(x, tok) \
((((x) ^ DBGP_DATA_TOGGLE) & 0xffff00) | ((tok) & 0xff))
#define DBGP_LEN_UPDATE(x, len) (((x) & ~0x0f) | ((len) & 0x0f))
/*
* USB Packet IDs (PIDs)
@ -154,14 +151,15 @@ static void dbgp_breath(void)
static int dbgp_wait_until_done(struct ehci_dbg_port *ehci_debug, struct dbgp_pipe *pipe,
unsigned ctrl, int loop)
{
u32 pids, lpid;
u32 rd_ctrl, rd_pids;
u8 lpid;
int ret;
retry:
write32((unsigned long)&ehci_debug->control, ctrl | DBGP_GO);
ret = dbgp_wait_until_complete(ehci_debug);
pids = read32((unsigned long)&ehci_debug->pids);
lpid = DBGP_PID_GET(pids);
rd_ctrl = read32((unsigned long)&ehci_debug->control);
rd_pids = read32((unsigned long)&ehci_debug->pids);
if (ret < 0) {
if (ret == -DBGP_ERR_BAD && --loop > 0)
@ -169,16 +167,29 @@ retry:
return ret;
}
lpid = DBGP_PID_GET(rd_pids);
/* If I get an ACK or in-sync DATA PID, we are done. */
if ((lpid == USB_PID_ACK) || (lpid == pipe->pid)) {
if (DBGP_LEN(rd_ctrl))
pipe->pid ^= USB_PID_DATA_TOGGLE;
}
/* If the port is getting full or it has dropped data
* start pacing ourselves, not necessary but it's friendly.
*/
if ((lpid == USB_PID_NAK) || (lpid == USB_PID_NYET))
else if (lpid == USB_PID_NYET) {
dbgp_breath();
/* If I get a NACK reissue the transmission */
if (lpid == USB_PID_NAK) {
if (--loop > 0)
goto retry;
ret = -DBGP_ERR_BAD;
}
/* If I get a NACK or out-of-sync DATA PID, reissue the transmission. */
else if ((lpid == USB_PID_NAK) || (lpid == (pipe->pid ^ USB_PID_DATA_TOGGLE))) {
if (--loop > 0)
goto retry;
ret = -DBGP_ERR_BAD;
}
return ret;
@ -223,14 +234,11 @@ static int dbgp_bulk_write(struct ehci_dbg_port *ehci_debug, struct dbgp_pipe *p
return -1;
addr = DBGP_EPADDR(pipe->devnum, pipe->endpoint);
pids = read32((unsigned long)&ehci_debug->pids);
pids = DBGP_PID_UPDATE(pids, USB_PID_OUT);
pids = DBGP_PID_SET(pipe->pid, USB_PID_OUT);
ctrl = read32((unsigned long)&ehci_debug->control);
ctrl = DBGP_LEN_UPDATE(ctrl, size);
ctrl |= DBGP_OUT;
ctrl |= DBGP_GO;
dbgp_set_data(ehci_debug, bytes, size);
write32((unsigned long)&ehci_debug->address, addr);
@ -257,14 +265,11 @@ static int dbgp_bulk_read(struct ehci_dbg_port *ehci_debug, struct dbgp_pipe *pi
return -1;
addr = DBGP_EPADDR(pipe->devnum, pipe->endpoint);
pids = read32((unsigned long)&ehci_debug->pids);
pids = DBGP_PID_UPDATE(pids, USB_PID_IN);
pids = DBGP_PID_SET(pipe->pid, USB_PID_IN);
ctrl = read32((unsigned long)&ehci_debug->control);
ctrl = DBGP_LEN_UPDATE(ctrl, size);
ctrl &= ~DBGP_OUT;
ctrl |= DBGP_GO;
write32((unsigned long)&ehci_debug->address, addr);
write32((unsigned long)&ehci_debug->pids, pids);
@ -317,8 +322,9 @@ static int dbgp_control_msg(struct ehci_dbg_port *ehci_debug, unsigned devnum, i
pipe->devnum = devnum;
pipe->endpoint = 0;
pipe->pid = USB_PID_DATA0;
addr = DBGP_EPADDR(pipe->devnum, pipe->endpoint);
pids = DBGP_PID_SET(USB_PID_DATA0, USB_PID_SETUP);
pids = DBGP_PID_SET(pipe->pid, USB_PID_SETUP);
ctrl = read32((unsigned long)&ehci_debug->control);
ctrl = DBGP_LEN_UPDATE(ctrl, sizeof(req));
@ -613,6 +619,7 @@ debug_dev_found:
/* Prepare endpoint pipes. */
for (i=1; i<DBGP_MAX_ENDPOINTS; i++) {
info->ep_pipe[i].devnum = USB_DEBUG_DEVNUM;
info->ep_pipe[i].pid = USB_PID_DATA0;
}
info->ep_pipe[DBGP_CONSOLE_EPOUT].endpoint = dbgp_desc.bDebugOutEndpoint;
info->ep_pipe[DBGP_CONSOLE_EPIN].endpoint = dbgp_desc.bDebugInEndpoint;