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Diffstat (limited to 'src/lib')
-rw-r--r--src/lib/usbdebug.c45
1 files changed, 26 insertions, 19 deletions
diff --git a/src/lib/usbdebug.c b/src/lib/usbdebug.c
index ab47c77099..7e6d1c3556 100644
--- a/src/lib/usbdebug.c
+++ b/src/lib/usbdebug.c
@@ -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 (--loop > 0)
+ goto retry;
+ ret = -DBGP_ERR_BAD;
+ }
- /* If I get a NACK reissue the transmission */
- if (lpid == USB_PID_NAK) {
+ /* 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;