1. TRCRSCTLRn - Resource Selection Control Registers n=0~1 are reserved,
we shouldn't access them.
2. The max number of 'n' here is defined in TRCIDR4.NUMRSPAIR whoes value
indicates the number of resource selection *pairs*, and 0 indicates
one resource selection pair, 1 indicates two pairs, and so on ...
So, the total number of resource selection control registers which we can
access is (TRCIDR4.NUMRSPAIR * 2)
Signed-off-by: Chunyan Zhang <zhang.chun...@linaro.org>
---
drivers/hwtracing/coresight/coresight-etm4x.c | 15 ++++++++++-----
1 file changed, 10 insertions(+), 5 deletions(-)
diff --git a/drivers/hwtracing/coresight/coresight-etm4x.c
b/drivers/hwtracing/coresight/coresight-etm4x.c
index 1312e99..9425249 100644
--- a/drivers/hwtracing/coresight/coresight-etm4x.c
+++ b/drivers/hwtracing/coresight/coresight-etm4x.c
@@ -136,7 +136,9 @@ static void etm4_enable_hw(void *info)
writel_relaxed(drvdata->cntr_val[i],
drvdata->base + TRCCNTVRn(i));
}
- for (i = 0; i < drvdata->nr_resource; i++)
+
+ /* Resource selector pair 0 is always implemented and reserved */
+ for (i = 2; i < (drvdata->nr_resource + 1) * 2; i++)
writel_relaxed(drvdata->res_ctrl[i],
drvdata->base + TRCRSCTLRn(i));
@@ -489,8 +491,9 @@ static ssize_t reset_store(struct device *dev,
drvdata->cntr_val[i] = 0x0;
}
- drvdata->res_idx = 0x0;
- for (i = 0; i < drvdata->nr_resource; i++)
+ /* Resource selector pair 0 is always implemented and reserved */
+ drvdata->res_idx = 0x2;
+ for (i = 2; i < (drvdata->nr_resource + 1) * 2; i++)
drvdata->res_ctrl[i] = 0x0;
for (i = 0; i < drvdata->nr_ss_cmp; i++) {
@@ -1729,7 +1732,7 @@ static ssize_t res_idx_store(struct device *dev,
if (kstrtoul(buf, 16, &val))
return -EINVAL;
/* Resource selector pair 0 is always implemented and reserved */
- if ((val == 0) || (val >= drvdata->nr_resource))
+ if (val < 2 || val > (drvdata->nr_resource + 1) * 2)
return -EINVAL;
/*
@@ -2498,7 +2501,9 @@ static void etm4_init_default_data(struct etmv4_drvdata
*drvdata)
drvdata->cntr_val[i] = 0x0;
}
- for (i = 2; i < drvdata->nr_resource * 2; i++)
+ /* Resource selector pair 0 is always implemented and reserved */
+ drvdata->res_idx = 0x2;
+ for (i = 2; i < (drvdata->nr_resource + 1) * 2; i++)
drvdata->res_ctrl[i] = 0x0;
for (i = 0; i < drvdata->nr_ss_cmp; i++) {
--
1.9.1
--
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