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soc: ti: pruss: Add pruss_{request,release}_mem_region() API

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Add two new API - pruss_request_mem_region() & pruss_release_mem_region(),
to the PRUSS platform driver to allow client drivers to acquire and release
the common memory resources present within a PRU-ICSS subsystem. This
allows the client drivers to directly manipulate the respective memories,
as per their design contract with the associated firmware.

Co-developed-by: Suman Anna <s-anna@ti.com>
Signed-off-by: Suman Anna <s-anna@ti.com>
Signed-off-by: Andrew F. Davis <afd@ti.com>
Co-developed-by: Grzegorz Jaszczyk <grzegorz.jaszczyk@linaro.org>
Signed-off-by: Grzegorz Jaszczyk <grzegorz.jaszczyk@linaro.org>
Reviewed-by: Roger Quadros <rogerq@kernel.org>
Acked-by: Mathieu Poirier <mathieu.poirier@linaro.org>
Reviewed-by: Tony Lindgren <tony@atomide.com>
Reviewed-by: Simon Horman <simon.horman@corigine.com>
Signed-off-by: MD Danish Anwar <danishanwar@ti.com>
Link: https://lore.kernel.org/r/20230414045542.3249939-3-danishanwar@ti.com
Signed-off-by: Nishanth Menon <nm@ti.com>
This commit is contained in:
Andrew F. Davis 2023-04-14 10:25:40 +05:30 committed by Nishanth Menon
parent 67d1b0a103
commit b789ca1e33
2 changed files with 99 additions and 0 deletions
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77
drivers/soc/ti/pruss.c
View file

@ -92,6 +92,82 @@ void pruss_put(struct pruss *pruss)
}
EXPORT_SYMBOL_GPL(pruss_put);
/**
* pruss_request_mem_region() - request a memory resource
* @pruss: the pruss instance
* @mem_id: the memory resource id
* @region: pointer to memory region structure to be filled in
*
* This function allows a client driver to request a memory resource,
* and if successful, will let the client driver own the particular
* memory region until released using the pruss_release_mem_region()
* API.
*
* Return: 0 if requested memory region is available (in such case pointer to
* memory region is returned via @region), an error otherwise
*/
int pruss_request_mem_region(struct pruss *pruss, enum pruss_mem mem_id,
struct pruss_mem_region *region)
{
if (!pruss || !region || mem_id >= PRUSS_MEM_MAX)
return -EINVAL;
mutex_lock(&pruss->lock);
if (pruss->mem_in_use[mem_id]) {
mutex_unlock(&pruss->lock);
return -EBUSY;
}
*region = pruss->mem_regions[mem_id];
pruss->mem_in_use[mem_id] = region;
mutex_unlock(&pruss->lock);
return 0;
}
EXPORT_SYMBOL_GPL(pruss_request_mem_region);
/**
* pruss_release_mem_region() - release a memory resource
* @pruss: the pruss instance
* @region: the memory region to release
*
* This function is the complimentary function to
* pruss_request_mem_region(), and allows the client drivers to
* release back a memory resource.
*
* Return: 0 on success, an error code otherwise
*/
int pruss_release_mem_region(struct pruss *pruss,
struct pruss_mem_region *region)
{
int id;
if (!pruss || !region)
return -EINVAL;
mutex_lock(&pruss->lock);
/* find out the memory region being released */
for (id = 0; id < PRUSS_MEM_MAX; id++) {
if (pruss->mem_in_use[id] == region)
break;
}
if (id == PRUSS_MEM_MAX) {
mutex_unlock(&pruss->lock);
return -EINVAL;
}
pruss->mem_in_use[id] = NULL;
mutex_unlock(&pruss->lock);
return 0;
}
EXPORT_SYMBOL_GPL(pruss_release_mem_region);
static void pruss_of_free_clk_provider(void *data)
{
struct device_node *clk_mux_np = data;
@ -298,6 +374,7 @@ static int pruss_probe(struct platform_device *pdev)
return -ENOMEM;
pruss->dev = dev;
mutex_init(&pruss->lock);
child = of_get_child_by_name(np, "memories");
if (!child) {

22
include/linux/pruss_driver.h
View file

@ -9,6 +9,7 @@
#ifndef _PRUSS_DRIVER_H_
#define _PRUSS_DRIVER_H_
#include <linux/mutex.h>
#include <linux/remoteproc/pruss.h>
#include <linux/types.h>
#include <linux/err.h>
@ -41,6 +42,8 @@ struct pruss_mem_region {
* @cfg_base: base iomap for CFG region
* @cfg_regmap: regmap for config region
* @mem_regions: data for each of the PRUSS memory regions
* @mem_in_use: to indicate if memory resource is in use
* @lock: mutex to serialize access to resources
* @core_clk_mux: clk handle for PRUSS CORE_CLK_MUX
* @iep_clk_mux: clk handle for PRUSS IEP_CLK_MUX
*/
@ -49,6 +52,8 @@ struct pruss {
void __iomem *cfg_base;
struct regmap *cfg_regmap;
struct pruss_mem_region mem_regions[PRUSS_MEM_MAX];
struct pruss_mem_region *mem_in_use[PRUSS_MEM_MAX];
struct mutex lock; /* PRU resource lock */
struct clk *core_clk_mux;
struct clk *iep_clk_mux;
};
@ -57,6 +62,10 @@ struct pruss {
struct pruss *pruss_get(struct rproc *rproc);
void pruss_put(struct pruss *pruss);
int pruss_request_mem_region(struct pruss *pruss, enum pruss_mem mem_id,
struct pruss_mem_region *region);
int pruss_release_mem_region(struct pruss *pruss,
struct pruss_mem_region *region);
#else
@ -67,6 +76,19 @@ static inline struct pruss *pruss_get(struct rproc *rproc)
static inline void pruss_put(struct pruss *pruss) { }
static inline int pruss_request_mem_region(struct pruss *pruss,
enum pruss_mem mem_id,
struct pruss_mem_region *region)
{
return -EOPNOTSUPP;
}
static inline int pruss_release_mem_region(struct pruss *pruss,
struct pruss_mem_region *region)
{
return -EOPNOTSUPP;
}
#endif /* CONFIG_TI_PRUSS */
#endif /* _PRUSS_DRIVER_H_ */