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usbdebug: Dump low-level protocol details 

Dumping these EHCI host controller registers is useful to
solve problems with debug devices.

Change-Id: I0610cecca57b1b952d4f87211dd00c8c0bc398b9
Signed-off-by: Kyösti Mälkki <kyosti.malkki@gmail.com>
Reviewed-on: http://review.coreboot.org/3866
Tested-by: build bot (Jenkins)
Reviewed-by: Aaron Durbin <adurbin@google.com>
This commit is contained in:
Kyösti Mälkki 2013-08-10 10:50:43 +03:00
parent 5c87d2f17e
commit e53cece07b
1 changed files with 37 additions and 1 deletions
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38
src/lib/usbdebug.c
View File

@ -63,10 +63,12 @@ struct ehci_debug_info {
};
#if CONFIG_DEBUG_USBDEBUG
static void dbgp_print_data(struct ehci_dbg_port *ehci_debug);
static int dbgp_enabled(void);
# define dprintk(LEVEL, args...) \
do { if (!dbgp_enabled()) printk(LEVEL, ##args); } while (0)
#else
# define dbgp_print_data(x) do {} while(0)
# define dprintk(LEVEL, args...) do {} while(0)
#endif
@ -136,8 +138,10 @@ static int dbgp_wait_until_complete(struct ehci_dbg_port *ehci_debug)
break;
} while (++loop < DBGP_MICROFRAME_TIMEOUT_LOOPS);
if (! (ctrl & DBGP_DONE))
if (! (ctrl & DBGP_DONE)) {
dprintk(BIOS_ERR, "dbgp_wait_until_complete: retry timeout.\n");
return -DBGP_ERR_SIGNAL;
}
/* Now that we have observed the completed transaction,
* clear the done bit.
@ -155,6 +159,7 @@ static int dbgp_wait_until_done(struct ehci_dbg_port *ehci_debug, struct dbgp_pi
unsigned ctrl, const int timeout)
{
u32 rd_ctrl, rd_pids;
u32 ctrl_prev = 0, pids_prev = 0;
u8 lpid;
int ret, host_retries;
int loop;
@ -168,11 +173,21 @@ device_retry:
host_retry:
if (host_retries++ >= DBGP_MICROFRAME_RETRIES)
return -DBGP_ERR_BAD;
if (loop == 1 || host_retries > 1)
dprintk(BIOS_SPEW, "dbgp: start (@ %3d,%d) ctrl=%08x\n",
loop, host_retries, ctrl | DBGP_GO);
write32((unsigned long)&ehci_debug->control, ctrl | DBGP_GO);
ret = dbgp_wait_until_complete(ehci_debug);
rd_ctrl = read32((unsigned long)&ehci_debug->control);
rd_pids = read32((unsigned long)&ehci_debug->pids);
if (rd_ctrl != ctrl_prev || rd_pids != pids_prev || (ret<0)) {
ctrl_prev = rd_ctrl;
pids_prev = rd_pids;
dprintk(BIOS_SPEW, "dbgp: status (@ %3d,%d) ctrl=%08x pids=%08x ret=%d\n",
loop, host_retries, rd_ctrl, rd_pids, ret);
}
/* Controller hardware failure. */
if (ret == -DBGP_ERR_SIGNAL) {
return ret;
@ -208,6 +223,8 @@ host_retry:
ret = -DBGP_ERR_BAD;
}
dbgp_print_data(ehci_debug);
return ret;
}
@ -240,6 +257,25 @@ static void dbgp_get_data(struct ehci_dbg_port *ehci_debug, void *buf, int size)
bytes[i] = (hi >> (8*(i - 4))) & 0xff;
}
#if CONFIG_DEBUG_USBDEBUG
static void dbgp_print_data(struct ehci_dbg_port *ehci_debug)
{
u32 ctrl = read32((unsigned long)&ehci_debug->control);
u32 lo = read32((unsigned long)&ehci_debug->data03);
u32 hi = read32((unsigned long)&ehci_debug->data47);
int len = DBGP_LEN(ctrl);
if (len) {
int i;
dprintk(BIOS_SPEW, "dbgp: buf:");
for (i = 0; i < 4 && i < len; i++)
dprintk(BIOS_SPEW, " %02x", (lo >> (8*i)) & 0xff);
for (; i < 8 && i < len; i++)
dprintk(BIOS_SPEW, " %02x", (hi >> (8*(i - 4))) & 0xff);
dprintk(BIOS_SPEW, "\n");
}
}
#endif
static int dbgp_bulk_write(struct ehci_dbg_port *ehci_debug, struct dbgp_pipe *pipe,
const char *bytes, int size)
{