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coresight: only use etm0 for populating configuration

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With maxcpus=1, only core0 will be running with other cores in
reset until they are explicitly hotplugged on. To avoid reading
ETM registers for cores that are in reset during probe, use only
ETM0 for populating configuration info. For other ETM probes,
copy the info from ETM0.

Change-Id: I9ae4539b004956a026e919323413f9e3c7d5ba4a
Signed-off-by: Pratik Patel <pratikp@codeaurora.org>
This commit is contained in:
Pratik Patel 2012-09-05 18:07:59 -07:00 committed by Iliyan Malchev
parent 1dfded8d83
commit a6b94fb4ab
1 changed files with 26 additions and 3 deletions
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29
drivers/coresight/coresight-etm.c
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@ -195,6 +195,8 @@ struct etm_drvdata {
uint32_t timestamp_event;
};
static struct etm_drvdata *etm0drvdata;
/* ETM clock is derived from the processor clock and gets enabled on a
* logical OR of below items on Krait (pass2 onwards):
* 1.CPMR[ETMCLKEN] is 1
@ -1459,6 +1461,16 @@ err:
return ret;
}
static void __devinit etm_copy_arch_data(struct etm_drvdata *drvdata)
{
drvdata->arch = etm0drvdata->arch;
drvdata->nr_addr_cmp = etm0drvdata->nr_addr_cmp;
drvdata->nr_cntr = etm0drvdata->nr_cntr;
drvdata->nr_ext_inp = etm0drvdata->nr_ext_inp;
drvdata->nr_ext_out = etm0drvdata->nr_ext_out;
drvdata->nr_ctxid_cmp = etm0drvdata->nr_ctxid_cmp;
}
static void __devinit etm_init_default_data(struct etm_drvdata *drvdata)
{
int i;
@ -1564,9 +1576,20 @@ static int __devinit etm_probe(struct platform_device *pdev)
if (ret)
goto err0;
ret = etm_init_arch_data(drvdata);
if (ret)
goto err1;
/* Use CPU0 to populate read-only configuration data for ETM0. For other
* ETMs copy it over from ETM0.
*/
if (drvdata->cpu == 0) {
ret = etm_init_arch_data(drvdata);
if (ret)
goto err1;
etm0drvdata = drvdata;
} else {
if (etm0drvdata)
etm_copy_arch_data(drvdata);
else
goto err1;
}
etm_init_default_data(drvdata);
clk_disable_unprepare(drvdata->clk);