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zy1000: add code to check that SRST asserts 

Signed-off-by: Øyvind Harboe <oyvind.harboe@zylin.com>
This commit is contained in:
Øyvind Harboe 2011-03-03 11:00:14 +01:00
parent 4332bc32e4
commit 558f760ff0
1 changed files with 42 additions and 34 deletions
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76
src/jtag/zy1000/zy1000.c
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@ -172,6 +172,45 @@ static int zy1000_power_dropout(int *dropout)
return ERROR_OK; return ERROR_OK;
} }
/* Wait for SRST to assert or deassert */
static void waitSRST(bool asserted)
{
bool first = true;
long long start = 0;
long total = 0;
const char *mode = asserted ? "assert" : "deassert";
for (;;)
{
bool srstAsserted = readSRST();
if ( (asserted && srstAsserted) || (!asserted && !srstAsserted) )
{
if (total > 1)
{
LOG_USER("SRST took %dms to %s", (int)total, mode);
}
break;
}
if (first)
{
first = false;
start = timeval_ms();
}
total = timeval_ms() - start;
keep_alive();
if (total > 5000)
{
LOG_ERROR("SRST took too long to %s: %dms", mode, (int)total);
break;
}
}
}
void zy1000_reset(int trst, int srst) void zy1000_reset(int trst, int srst)
{ {
LOG_DEBUG("zy1000 trst=%d, srst=%d", trst, srst); LOG_DEBUG("zy1000 trst=%d, srst=%d", trst, srst);
@ -192,6 +231,8 @@ void zy1000_reset(int trst, int srst)
* idle in TAP_IDLE, reset halt on str912 will fail. * idle in TAP_IDLE, reset halt on str912 will fail.
*/ */
ZY1000_POKE(ZY1000_JTAG_BASE + 0x10, 0x00000001); ZY1000_POKE(ZY1000_JTAG_BASE + 0x10, 0x00000001);
waitSRST(true);
} }
if (!trst) if (!trst)
@ -218,40 +259,7 @@ void zy1000_reset(int trst, int srst)
if ((!srst && ((jtag_get_reset_config() & RESET_TRST_PULLS_SRST) == 0))|| if ((!srst && ((jtag_get_reset_config() & RESET_TRST_PULLS_SRST) == 0))||
(!srst && !trst && (jtag_get_reset_config() & RESET_TRST_PULLS_SRST))) (!srst && !trst && (jtag_get_reset_config() & RESET_TRST_PULLS_SRST)))
{ {
bool first = true; waitSRST(false);
long long start = 0;
long total = 0;
for (;;)
{
// We don't want to sense our own reset, so we clear here.
// There is of course a timing hole where we could loose
// a "real" reset.
if (!readSRST())
{
if (total > 1)
{
LOG_USER("SRST took %dms to deassert", (int)total);
}
break;
}
if (first)
{
first = false;
start = timeval_ms();
}
total = timeval_ms() - start;
keep_alive();
if (total > 5000)
{
LOG_ERROR("SRST took too long to deassert: %dms", (int)total);
break;
}
}
} }
} }