@@ -19,7 +19,7 @@
#include <linux/of_device.h>
#include <linux/of_irq.h>
#include <linux/remoteproc/pruss.h>
-#include <linux/pruss_driver.h>
+#include <linux/pruss_internal.h>
#include <linux/remoteproc.h>
#include "remoteproc_internal.h"
@@ -6,6 +6,7 @@
* Author(s):
* Suman Anna <s-anna@ti.com>
* Andrew F. Davis <afd@ti.com>
+ * Tero Kristo <t-kristo@ti.com>
*/
#include <linux/clk-provider.h>
@@ -16,8 +17,9 @@
#include <linux/of_address.h>
#include <linux/of_device.h>
#include <linux/pm_runtime.h>
-#include <linux/pruss_driver.h>
+#include <linux/pruss_internal.h>
#include <linux/regmap.h>
+#include <linux/remoteproc.h>
#include <linux/slab.h>
/**
@@ -30,6 +32,66 @@ struct pruss_private_data {
bool has_core_mux_clock;
};
+/**
+ * pruss_get() - get the pruss for a given PRU remoteproc
+ * @rproc: remoteproc handle of a PRU instance
+ *
+ * Finds the parent pruss device for a PRU given the @rproc handle of the
+ * PRU remote processor. This function increments the pruss device's refcount,
+ * so always use pruss_put() to decrement it back once pruss isn't needed
+ * anymore.
+ *
+ * This API doesn't check if @rproc is valid or not. It is expected the caller
+ * will have done a pru_rproc_get() on @rproc, before calling this API to make
+ * sure that @rproc is valid.
+ *
+ * Return: pruss handle on success, and an ERR_PTR on failure using one
+ * of the following error values
+ * -EINVAL if invalid parameter
+ * -ENODEV if PRU device or PRUSS device is not found
+ */
+struct pruss *pruss_get(struct rproc *rproc)
+{
+ struct pruss *pruss;
+ struct device *dev;
+ struct platform_device *ppdev;
+
+ if (IS_ERR_OR_NULL(rproc))
+ return ERR_PTR(-EINVAL);
+
+ dev = &rproc->dev;
+
+ /* make sure it is PRU rproc */
+ if (!dev->parent || !is_pru_rproc(dev->parent))
+ return ERR_PTR(-ENODEV);
+
+ ppdev = to_platform_device(dev->parent->parent);
+ pruss = platform_get_drvdata(ppdev);
+ if (!pruss)
+ return ERR_PTR(-ENODEV);
+
+ get_device(pruss->dev);
+
+ return pruss;
+}
+EXPORT_SYMBOL_GPL(pruss_get);
+
+/**
+ * pruss_put() - decrement pruss device's usecount
+ * @pruss: pruss handle
+ *
+ * Complimentary function for pruss_get(). Needs to be called
+ * after the PRUSS is used, and only if the pruss_get() succeeds.
+ */
+void pruss_put(struct pruss *pruss)
+{
+ if (IS_ERR_OR_NULL(pruss))
+ return;
+
+ put_device(pruss->dev);
+}
+EXPORT_SYMBOL_GPL(pruss_put);
+
static void pruss_of_free_clk_provider(void *data)
{
struct device_node *clk_mux_np = data;
similarity index 90%
rename from include/linux/pruss_driver.h
rename to include/linux/pruss_internal.h
@@ -6,9 +6,10 @@
* Suman Anna <s-anna@ti.com>
*/
-#ifndef _PRUSS_DRIVER_H_
-#define _PRUSS_DRIVER_H_
+#ifndef _PRUSS_INTERNAL_H_
+#define _PRUSS_INTERNAL_H_
+#include <linux/remoteproc/pruss.h>
#include <linux/types.h>
/*
@@ -51,4 +52,4 @@ struct pruss {
struct clk *iep_clk_mux;
};
-#endif /* _PRUSS_DRIVER_H_ */
+#endif /* _PRUSS_INTERNAL_H_ */
@@ -4,12 +4,14 @@
*
* Copyright (C) 2015-2022 Texas Instruments Incorporated - http://www.ti.com
* Suman Anna <s-anna@ti.com>
+ * Tero Kristo <t-kristo@ti.com>
*/
#ifndef __LINUX_PRUSS_H
#define __LINUX_PRUSS_H
#include <linux/device.h>
+#include <linux/err.h>
#include <linux/types.h>
#define PRU_RPROC_DRVNAME "pru-rproc"
@@ -44,6 +46,23 @@ enum pru_ctable_idx {
struct device_node;
struct rproc;
+struct pruss;
+
+#if IS_ENABLED(CONFIG_TI_PRUSS)
+
+struct pruss *pruss_get(struct rproc *rproc);
+void pruss_put(struct pruss *pruss);
+
+#else
+
+static inline struct pruss *pruss_get(struct rproc *rproc)
+{
+ return ERR_PTR(-EOPNOTSUPP);
+}
+
+static inline void pruss_put(struct pruss *pruss) { }
+
+#endif /* CONFIG_TI_PRUSS */
#if IS_ENABLED(CONFIG_PRU_REMOTEPROC)