[PATCH v7 1/4] remoteproc/davinci: use the reset framework

Bartosz Golaszewski
2018-06-21T07:37:03Z

From: Bartosz Golaszewski <bgolaszewski@baylibre.com>

Switch to using the reset framework instead of handcoded reset routines
we used so far.

Signed-off-by: Bartosz Golaszewski <bgolaszewski@baylibre.com>
Reviewed-by: Sekhar Nori <nsekhar@ti.com>
Reviewed-by: Philipp Zabel <p.zabel@pengutronix.de>
---
drivers/remoteproc/da8xx_remoteproc.c | 34 +++++++++++++++++++++++----
1 file changed, 29 insertions(+), 5 deletions(-)

diff --git a/drivers/remoteproc/da8xx_remoteproc.c b/drivers/remoteproc/da8xx_remoteproc.c
index b668e32996e2..76c06b70a1c6 100644
--- a/drivers/remoteproc/da8xx_remoteproc.c
+++ b/drivers/remoteproc/da8xx_remoteproc.c
@@ -10,6 +10,7 @@

#include <linux/bitops.h>
#include <linux/clk.h>
+#include <linux/reset.h>
#include <linux/err.h>
#include <linux/interrupt.h>
#include <linux/io.h>
@@ -20,8 +21,6 @@
#include <linux/platform_device.h>
#include <linux/remoteproc.h>

-#include <mach/clock.h> /* for davinci_clk_reset_assert/deassert() */
-
#include "remoteproc_internal.h"

static char *da8xx_fw_name;
@@ -72,6 +71,7 @@ struct da8xx_rproc {
struct da8xx_rproc_mem *mem;
int num_mems;
struct clk *dsp_clk;
+ struct reset_control *dsp_reset;
void (*ack_fxn)(struct irq_data *data);
struct irq_data *irq_data;
void __iomem *chipsig;
@@ -138,6 +138,7 @@ static int da8xx_rproc_start(struct rproc *rproc)
struct device *dev = rproc->dev.parent;
struct da8xx_rproc *drproc = (struct da8xx_rproc *)rproc->priv;
struct clk *dsp_clk = drproc->dsp_clk;
+ struct reset_control *dsp_reset = drproc->dsp_reset;
int ret;

/* hw requires the start (boot) address be on 1KB boundary */
@@ -155,7 +156,12 @@ static int da8xx_rproc_start(struct rproc *rproc)
return ret;
}

- davinci_clk_reset_deassert(dsp_clk);
+ ret = reset_control_deassert(dsp_reset);
+ if (ret) {
+ dev_err(dev, "reset_control_deassert() failed: %d\n", ret);
+ clk_disable_unprepare(dsp_clk);
+ return ret;
+ }

return 0;
}
@@ -163,8 +169,15 @@ static int da8xx_rproc_start(struct rproc *rproc)
static int da8xx_rproc_stop(struct rproc *rproc)
{
struct da8xx_rproc *drproc = rproc->priv;
+ struct device *dev = rproc->dev.parent;
+ int ret;
+
+ ret = reset_control_assert(drproc->dsp_reset);
+ if (ret) {
+ dev_err(dev, "reset_control_assert() failed: %d\n", ret);
+ return ret;
+ }

- davinci_clk_reset_assert(drproc->dsp_clk);
clk_disable_unprepare(drproc->dsp_clk);

return 0;
@@ -232,6 +245,7 @@ static int da8xx_rproc_probe(struct platform_device *pdev)
struct resource *bootreg_res;
struct resource *chipsig_res;
struct clk *dsp_clk;
+ struct reset_control *dsp_reset;
void __iomem *chipsig;
void __iomem *bootreg;
int irq;
@@ -268,6 +282,15 @@ static int da8xx_rproc_probe(struct platform_device *pdev)
return PTR_ERR(dsp_clk);
}

+ dsp_reset = devm_reset_control_get_exclusive(dev, NULL);
+ if (IS_ERR(dsp_reset)) {
+ if (PTR_ERR(dsp_reset) != -EPROBE_DEFER)
+ dev_err(dev, "unable to get reset control: %ld\n",
+ PTR_ERR(dsp_reset));
+
+ return PTR_ERR(dsp_reset);
+ }
+
if (dev->of_node) {
ret = of_reserved_mem_device_init(dev);
if (ret) {
@@ -287,6 +310,7 @@ static int da8xx_rproc_probe(struct platform_device *pdev)
drproc = rproc->priv;
drproc->rproc = rproc;
drproc->dsp_clk = dsp_clk;
+ drproc->dsp_reset = dsp_reset;
rproc->has_iommu = false;

ret = da8xx_rproc_get_internal_memories(pdev, drproc);
@@ -309,7 +333,7 @@ static int da8xx_rproc_probe(struct platform_device *pdev)
* *not* in reset, but da8xx_rproc_start() needs the DSP to be
* held in reset at the time it is called.
*/
- ret = davinci_clk_reset_assert(drproc->dsp_clk);
+ ret = reset_control_assert(dsp_reset);
if (ret)
goto free_rproc;

--
2.17.1