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coresight: etm4x: Use TRCDEVARCH for component discovery

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We have been using TRCIDR1 for detecting the ETM version. This
is in preparation for the future IP support.

Link: https://lore.kernel.org/r/20210110224850.1880240-20-suzuki.poulose@arm.com
Cc: Mike Leach <mike.leach@linaro.org>
Signed-off-by: Suzuki K Poulose <suzuki.poulose@arm.com>
Signed-off-by: Mathieu Poirier <mathieu.poirier@linaro.org>
Link: https://lore.kernel.org/r/20210201181351.1475223-22-mathieu.poirier@linaro.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Suzuki K Poulose 2021-02-01 11:13:41 -07:00 committed by Greg Kroah-Hartman
parent fd6e790500
commit 8b94db1eda
1 changed files with 23 additions and 23 deletions
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46
drivers/hwtracing/coresight/coresight-etm4x-core.c
View File

@ -153,18 +153,6 @@ static void etm4_cs_unlock(struct etmv4_drvdata *drvdata,
CS_UNLOCK(csa->base);
}
static bool etm4_arch_supported(u8 arch)
{
/* Mask out the minor version number */
switch (arch & 0xf0) {
case ETM_ARCH_V4:
break;
default:
return false;
}
return true;
}
static int etm4_cpu_id(struct coresight_device *csdev)
{
struct etmv4_drvdata *drvdata = dev_get_drvdata(csdev->dev.parent);
@ -784,6 +772,26 @@ static const struct coresight_ops etm4_cs_ops = {
static bool etm4_init_iomem_access(struct etmv4_drvdata *drvdata,
struct csdev_access *csa)
{
u32 devarch = readl_relaxed(drvdata->base + TRCDEVARCH);
u32 idr1 = readl_relaxed(drvdata->base + TRCIDR1);
/*
* All ETMs must implement TRCDEVARCH to indicate that
* the component is an ETMv4. To support any broken
* implementations we fall back to TRCIDR1 check, which
* is not really reliable.
*/
if ((devarch & ETM_DEVARCH_ID_MASK) == ETM_DEVARCH_ETMv4x_ARCH) {
drvdata->arch = etm_devarch_to_arch(devarch);
} else {
pr_warn("CPU%d: ETM4x incompatible TRCDEVARCH: %x, falling back to TRCIDR1\n",
smp_processor_id(), devarch);
if (ETM_TRCIDR1_ARCH_MAJOR(idr1) != ETM_TRCIDR1_ARCH_ETMv4)
return false;
drvdata->arch = etm_trcidr_to_arch(idr1);
}
*csa = CSDEV_ACCESS_IOMEM(drvdata->base);
return true;
}
@ -800,7 +808,6 @@ static bool etm4_init_csdev_access(struct etmv4_drvdata *drvdata,
static void etm4_init_arch_data(void *info)
{
u32 etmidr0;
u32 etmidr1;
u32 etmidr2;
u32 etmidr3;
u32 etmidr4;
@ -865,14 +872,6 @@ static void etm4_init_arch_data(void *info)
/* TSSIZE, bits[28:24] Global timestamp size field */
drvdata->ts_size = BMVAL(etmidr0, 24, 28);
/* base architecture of trace unit */
etmidr1 = etm4x_relaxed_read32(csa, TRCIDR1);
/*
* TRCARCHMIN, bits[7:4] architecture the minor version number
* TRCARCHMAJ, bits[11:8] architecture major versin number
*/
drvdata->arch = BMVAL(etmidr1, 4, 11);
/* maximum size of resources */
etmidr2 = etm4x_relaxed_read32(csa, TRCIDR2);
/* CIDSIZE, bits[9:5] Indicates the Context ID size */
@ -1712,7 +1711,7 @@ static int etm4_probe(struct amba_device *adev, const struct amba_id *id)
etm4_init_arch_data, &init_arg, 1))
dev_err(dev, "ETM arch init failed\n");
if (etm4_arch_supported(drvdata->arch) == false)
if (!drvdata->arch)
return -EINVAL;
etm4_init_trace_id(drvdata);
@ -1744,7 +1743,8 @@ static int etm4_probe(struct amba_device *adev, const struct amba_id *id)
pm_runtime_put(&adev->dev);
dev_info(&drvdata->csdev->dev, "CPU%d: ETM v%d.%d initialized\n",
drvdata->cpu, drvdata->arch >> 4, drvdata->arch & 0xf);
drvdata->cpu, ETM_ARCH_MAJOR_VERSION(drvdata->arch),
ETM_ARCH_MINOR_VERSION(drvdata->arch));
if (boot_enable) {
coresight_enable(drvdata->csdev);