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Message-Id: <1458678202-3447-7-git-send-email-mathieu.poirier@linaro.org>
Date: Tue, 22 Mar 2016 14:23:14 -0600
From: Mathieu Poirier <mathieu.poirier@...aro.org>
To: linux-arm-kernel@...ts.infradead.org
Cc: linux-kernel@...r.kernel.org
Subject: [PATCH 06/14] coresight: tmc: making prepare/unprepare functions generic
Dealing with HW related matters in tmc_read_prepare/unprepare
becomes convoluted when many cases need to be handled distinctively.
As such moving processing related to HW setup to individual driver
files and keep the core driver generic.
Signed-off-by: Mathieu Poirier <mathieu.poirier@...aro.org>
---
drivers/hwtracing/coresight/coresight-tmc-etf.c | 68 ++++++++++++++++++++++++-
drivers/hwtracing/coresight/coresight-tmc-etr.c | 50 +++++++++++++++++-
drivers/hwtracing/coresight/coresight-tmc.c | 55 ++++----------------
drivers/hwtracing/coresight/coresight-tmc.h | 8 +--
4 files changed, 131 insertions(+), 50 deletions(-)
diff --git a/drivers/hwtracing/coresight/coresight-tmc-etf.c b/drivers/hwtracing/coresight/coresight-tmc-etf.c
index 467d19221f7b..789384be81b6 100644
--- a/drivers/hwtracing/coresight/coresight-tmc-etf.c
+++ b/drivers/hwtracing/coresight/coresight-tmc-etf.c
@@ -71,7 +71,7 @@ static void tmc_etb_dump_hw(struct tmc_drvdata *drvdata)
}
}
-void tmc_etb_disable_hw(struct tmc_drvdata *drvdata)
+static void tmc_etb_disable_hw(struct tmc_drvdata *drvdata)
{
CS_UNLOCK(drvdata->base);
@@ -202,3 +202,69 @@ const struct coresight_ops tmc_etf_cs_ops = {
.sink_ops = &tmc_etf_sink_ops,
.link_ops = &tmc_etf_link_ops,
};
+
+int tmc_read_prepare_etf(struct tmc_drvdata *drvdata)
+{
+ int ret = 0;
+ enum tmc_mode mode;
+ unsigned long flags;
+
+ spin_lock_irqsave(&drvdata->spinlock, flags);
+
+ /* The TMC isn't enable, so there is no need to disable it */
+ if (!drvdata->enable)
+ goto out;
+
+ if (drvdata->config_type != TMC_CONFIG_TYPE_ETB &&
+ drvdata->config_type != TMC_CONFIG_TYPE_ETF) {
+ ret = -EINVAL;
+ goto out;
+ }
+
+ /* There is no point in reading a TMC in HW FIFO mode */
+ mode = readl_relaxed(drvdata->base + TMC_MODE);
+ if (mode != TMC_MODE_CIRCULAR_BUFFER) {
+ ret = -EINVAL;
+ goto out;
+ }
+
+ tmc_etb_disable_hw(drvdata);
+ drvdata->reading = true;
+
+out:
+ spin_unlock_irqrestore(&drvdata->spinlock, flags);
+ return ret;
+}
+
+int tmc_read_unprepare_etf(struct tmc_drvdata *drvdata)
+{
+ int ret = 0;
+ enum tmc_mode mode;
+ unsigned long flags;
+
+ spin_lock_irqsave(&drvdata->spinlock, flags);
+
+ /* The TMC isn't enable, so there is no need to enable it */
+ if (!drvdata->enable)
+ goto out;
+
+ if (drvdata->config_type != TMC_CONFIG_TYPE_ETB &&
+ drvdata->config_type != TMC_CONFIG_TYPE_ETF) {
+ ret = -EINVAL;
+ goto out;
+ }
+
+ /* There is no point in reading a TMC in HW FIFO mode */
+ mode = readl_relaxed(drvdata->base + TMC_MODE);
+ if (mode != TMC_MODE_CIRCULAR_BUFFER) {
+ ret = -EINVAL;
+ goto out;
+ }
+
+ tmc_etb_enable_hw(drvdata);
+ drvdata->reading = false;
+
+out:
+ spin_unlock_irqrestore(&drvdata->spinlock, flags);
+ return ret;
+}
diff --git a/drivers/hwtracing/coresight/coresight-tmc-etr.c b/drivers/hwtracing/coresight/coresight-tmc-etr.c
index 910d6f3b7d26..e1b43e0bd1dd 100644
--- a/drivers/hwtracing/coresight/coresight-tmc-etr.c
+++ b/drivers/hwtracing/coresight/coresight-tmc-etr.c
@@ -70,7 +70,7 @@ static void tmc_etr_dump_hw(struct tmc_drvdata *drvdata)
drvdata->buf = drvdata->vaddr;
}
-void tmc_etr_disable_hw(struct tmc_drvdata *drvdata)
+static void tmc_etr_disable_hw(struct tmc_drvdata *drvdata)
{
CS_UNLOCK(drvdata->base);
@@ -126,3 +126,51 @@ static const struct coresight_ops_sink tmc_etr_sink_ops = {
const struct coresight_ops tmc_etr_cs_ops = {
.sink_ops = &tmc_etr_sink_ops,
};
+
+int tmc_read_prepare_etr(struct tmc_drvdata *drvdata)
+{
+ int ret = 0;
+ unsigned long flags;
+
+ spin_lock_irqsave(&drvdata->spinlock, flags);
+
+ /* The TMC isn't enable, so there is no need to disable it */
+ if (!drvdata->enable)
+ goto out;
+
+ if (drvdata->config_type != TMC_CONFIG_TYPE_ETR) {
+ ret = -EINVAL;
+ goto out;
+ }
+
+ tmc_etr_disable_hw(drvdata);
+ drvdata->reading = true;
+
+out:
+ spin_unlock_irqrestore(&drvdata->spinlock, flags);
+ return ret;
+}
+
+int tmc_read_unprepare_etr(struct tmc_drvdata *drvdata)
+{
+ int ret = 0;
+ unsigned long flags;
+
+ spin_lock_irqsave(&drvdata->spinlock, flags);
+
+ /* The TMC isn't enable, so there is no need to enable it */
+ if (!drvdata->enable)
+ goto out;
+
+ if (drvdata->config_type != TMC_CONFIG_TYPE_ETR) {
+ ret = -EINVAL;
+ goto out;
+ }
+
+ tmc_etr_enable_hw(drvdata);
+ drvdata->reading = false;
+
+out:
+ spin_unlock_irqrestore(&drvdata->spinlock, flags);
+ return ret;
+}
diff --git a/drivers/hwtracing/coresight/coresight-tmc.c b/drivers/hwtracing/coresight/coresight-tmc.c
index bc31131e4bd5..26dbef305851 100644
--- a/drivers/hwtracing/coresight/coresight-tmc.c
+++ b/drivers/hwtracing/coresight/coresight-tmc.c
@@ -75,76 +75,43 @@ void tmc_disable_hw(struct tmc_drvdata *drvdata)
static int tmc_read_prepare(struct tmc_drvdata *drvdata)
{
int ret = 0;
- unsigned long flags;
- enum tmc_mode mode;
-
- spin_lock_irqsave(&drvdata->spinlock, flags);
- if (!drvdata->enable)
- goto out;
switch (drvdata->config_type) {
case TMC_CONFIG_TYPE_ETB:
- tmc_etb_disable_hw(drvdata);
- break;
case TMC_CONFIG_TYPE_ETF:
- /* There is no point in reading a TMC in HW FIFO mode */
- mode = readl_relaxed(drvdata->base + TMC_MODE);
- if (mode != TMC_MODE_CIRCULAR_BUFFER) {
- ret = -EINVAL;
- goto err;
- }
-
- tmc_etb_disable_hw(drvdata);
+ ret = tmc_read_prepare_etf(drvdata);
break;
case TMC_CONFIG_TYPE_ETR:
- tmc_etr_disable_hw(drvdata);
+ ret = tmc_read_prepare_etr(drvdata);
break;
default:
ret = -EINVAL;
- goto err;
}
-out:
- drvdata->reading = true;
- dev_info(drvdata->dev, "TMC read start\n");
-err:
- spin_unlock_irqrestore(&drvdata->spinlock, flags);
+ if (!ret)
+ dev_info(drvdata->dev, "TMC read start\n");
+
return ret;
}
static void tmc_read_unprepare(struct tmc_drvdata *drvdata)
{
- unsigned long flags;
- enum tmc_mode mode;
-
- spin_lock_irqsave(&drvdata->spinlock, flags);
- if (!drvdata->enable)
- goto out;
+ int ret = 0;
switch (drvdata->config_type) {
case TMC_CONFIG_TYPE_ETB:
- tmc_etb_enable_hw(drvdata);
- break;
case TMC_CONFIG_TYPE_ETF:
- /* Make sure we don't re-enable a TMC in HW FIFO mode */
- mode = readl_relaxed(drvdata->base + TMC_MODE);
- if (mode != TMC_MODE_CIRCULAR_BUFFER)
- goto err;
-
- tmc_etb_enable_hw(drvdata);
+ ret = tmc_read_unprepare_etf(drvdata);
break;
case TMC_CONFIG_TYPE_ETR:
- tmc_etr_disable_hw(drvdata);
+ ret = tmc_read_unprepare_etr(drvdata);
break;
default:
- goto err;
+ ret = -EINVAL;
}
-out:
- drvdata->reading = false;
- dev_info(drvdata->dev, "TMC read end\n");
-err:
- spin_unlock_irqrestore(&drvdata->spinlock, flags);
+ if (!ret)
+ dev_info(drvdata->dev, "TMC read end\n");
}
static int tmc_open(struct inode *inode, struct file *file)
diff --git a/drivers/hwtracing/coresight/coresight-tmc.h b/drivers/hwtracing/coresight/coresight-tmc.h
index b99d4dfc1d0b..6b11caf77ad1 100644
--- a/drivers/hwtracing/coresight/coresight-tmc.h
+++ b/drivers/hwtracing/coresight/coresight-tmc.h
@@ -128,13 +128,13 @@ void tmc_enable_hw(struct tmc_drvdata *drvdata);
void tmc_disable_hw(struct tmc_drvdata *drvdata);
/* ETB/ETF functions */
-void tmc_etb_enable_hw(struct tmc_drvdata *drvdata);
-void tmc_etb_disable_hw(struct tmc_drvdata *drvdata);
+int tmc_read_prepare_etf(struct tmc_drvdata *drvdata);
+int tmc_read_unprepare_etf(struct tmc_drvdata *drvdata);
extern const struct coresight_ops tmc_etb_cs_ops;
extern const struct coresight_ops tmc_etf_cs_ops;
/* ETR functions */
-void tmc_etr_enable_hw(struct tmc_drvdata *drvdata);
-void tmc_etr_disable_hw(struct tmc_drvdata *drvdata);
+int tmc_read_prepare_etr(struct tmc_drvdata *drvdata);
+int tmc_read_unprepare_etr(struct tmc_drvdata *drvdata);
extern const struct coresight_ops tmc_etr_cs_ops;
#endif
--
2.1.4
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