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remoteproc: pru: Add APIs to get and put the PRU cores

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Add two new APIs, pru_rproc_get() and pru_rproc_put(), to the PRU
driver to allow client drivers to acquire and release the remoteproc
device associated with a PRU core. The PRU cores are treated as
resources with only one client owning it at a time.

The pru_rproc_get() function returns the rproc handle corresponding
to a PRU core identified by the device tree "ti,prus" property under
the client node. The pru_rproc_put() is the complementary function
to pru_rproc_get().

Signed-off-by: Suman Anna <s-anna@ti.com>
Signed-off-by: Tero Kristo <t-kristo@ti.com>
Signed-off-by: Grzegorz Jaszczyk <grzegorz.jaszczyk@linaro.org>
Signed-off-by: MD Danish Anwar <danishanwar@ti.com>
Reviewed-by: Roger Quadros <rogerq@kernel.org>
Link: https://lore.kernel.org/r/20230106121046.886863-4-danishanwar@ti.com
Signed-off-by: Mathieu Poirier <mathieu.poirier@linaro.org>
This commit is contained in:
MD Danish Anwar 2023-01-06 17:40:43 +05:30 committed by Mathieu Poirier
parent 9b9ad70f28
commit 919e894254
2 changed files with 156 additions and 2 deletions
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128
drivers/remoteproc/pru_rproc.c
View File

@ -2,12 +2,14 @@
/*
* PRU-ICSS remoteproc driver for various TI SoCs
*
* Copyright (C) 2014-2020 Texas Instruments Incorporated - https://www.ti.com/
* Copyright (C) 2014-2022 Texas Instruments Incorporated - https://www.ti.com/
*
* Author(s):
* Suman Anna <s-anna@ti.com>
* Andrew F. Davis <afd@ti.com>
* Grzegorz Jaszczyk <grzegorz.jaszczyk@linaro.org> for Texas Instruments
* Puranjay Mohan <p-mohan@ti.com>
* Md Danish Anwar <danishanwar@ti.com>
*/
#include <linux/bitops.h>
@ -112,6 +114,8 @@ struct pru_private_data {
* @rproc: remoteproc pointer for this PRU core
* @data: PRU core specific data
* @mem_regions: data for each of the PRU memory regions
* @client_np: client device node
* @lock: mutex to protect client usage
* @fw_name: name of firmware image used during loading
* @mapped_irq: virtual interrupt numbers of created fw specific mapping
* @pru_interrupt_map: pointer to interrupt mapping description (firmware)
@ -127,6 +131,8 @@ struct pru_rproc {
struct rproc *rproc;
const struct pru_private_data *data;
struct pruss_mem_region mem_regions[PRU_IOMEM_MAX];
struct device_node *client_np;
struct mutex lock;
const char *fw_name;
unsigned int *mapped_irq;
struct pru_irq_rsc *pru_interrupt_map;
@ -147,6 +153,120 @@ void pru_control_write_reg(struct pru_rproc *pru, unsigned int reg, u32 val)
writel_relaxed(val, pru->mem_regions[PRU_IOMEM_CTRL].va + reg);
}
static struct rproc *__pru_rproc_get(struct device_node *np, int index)
{
struct rproc *rproc;
phandle rproc_phandle;
int ret;
ret = of_property_read_u32_index(np, "ti,prus", index, &rproc_phandle);
if (ret)
return ERR_PTR(ret);
rproc = rproc_get_by_phandle(rproc_phandle);
if (!rproc) {
ret = -EPROBE_DEFER;
return ERR_PTR(ret);
}
/* make sure it is PRU rproc */
if (!is_pru_rproc(rproc->dev.parent)) {
rproc_put(rproc);
return ERR_PTR(-ENODEV);
}
return rproc;
}
/**
* pru_rproc_get() - get the PRU rproc instance from a device node
* @np: the user/client device node
* @index: index to use for the ti,prus property
* @pru_id: optional pointer to return the PRU remoteproc processor id
*
* This function looks through a client device node's "ti,prus" property at
* index @index and returns the rproc handle for a valid PRU remote processor if
* found. The function allows only one user to own the PRU rproc resource at a
* time. Caller must call pru_rproc_put() when done with using the rproc, not
* required if the function returns a failure.
*
* When optional @pru_id pointer is passed the PRU remoteproc processor id is
* returned.
*
* Return: rproc handle on success, and an ERR_PTR on failure using one
* of the following error values
* -ENODEV if device is not found
* -EBUSY if PRU is already acquired by anyone
* -EPROBE_DEFER is PRU device is not probed yet
*/
struct rproc *pru_rproc_get(struct device_node *np, int index,
enum pruss_pru_id *pru_id)
{
struct rproc *rproc;
struct pru_rproc *pru;
struct device *dev;
int ret;
rproc = __pru_rproc_get(np, index);
if (IS_ERR(rproc))
return rproc;
pru = rproc->priv;
dev = &rproc->dev;
mutex_lock(&pru->lock);
if (pru->client_np) {
mutex_unlock(&pru->lock);
ret = -EBUSY;
goto err_no_rproc_handle;
}
pru->client_np = np;
mutex_unlock(&pru->lock);
if (pru_id)
*pru_id = pru->id;
return rproc;
err_no_rproc_handle:
rproc_put(rproc);
return ERR_PTR(ret);
}
EXPORT_SYMBOL_GPL(pru_rproc_get);
/**
* pru_rproc_put() - release the PRU rproc resource
* @rproc: the rproc resource to release
*
* Releases the PRU rproc resource and makes it available to other
* users.
*/
void pru_rproc_put(struct rproc *rproc)
{
struct pru_rproc *pru;
if (IS_ERR_OR_NULL(rproc) || !is_pru_rproc(rproc->dev.parent))
return;
pru = rproc->priv;
mutex_lock(&pru->lock);
if (!pru->client_np) {
mutex_unlock(&pru->lock);
return;
}
pru->client_np = NULL;
mutex_unlock(&pru->lock);
rproc_put(rproc);
}
EXPORT_SYMBOL_GPL(pru_rproc_put);
static inline u32 pru_debug_read_reg(struct pru_rproc *pru, unsigned int reg)
{
return readl_relaxed(pru->mem_regions[PRU_IOMEM_DEBUG].va + reg);
@ -817,6 +937,8 @@ static int pru_rproc_probe(struct platform_device *pdev)
pru->pruss = platform_get_drvdata(ppdev);
pru->rproc = rproc;
pru->fw_name = fw_name;
pru->client_np = NULL;
mutex_init(&pru->lock);
for (i = 0; i < ARRAY_SIZE(mem_names); i++) {
res = platform_get_resource_byname(pdev, IORESOURCE_MEM,
@ -905,7 +1027,7 @@ MODULE_DEVICE_TABLE(of, pru_rproc_match);
static struct platform_driver pru_rproc_driver = {
.driver = {
.name = "pru-rproc",
.name = PRU_RPROC_DRVNAME,
.of_match_table = pru_rproc_match,
.suppress_bind_attrs = true,
},
@ -917,5 +1039,7 @@ module_platform_driver(pru_rproc_driver);
MODULE_AUTHOR("Suman Anna <s-anna@ti.com>");
MODULE_AUTHOR("Andrew F. Davis <afd@ti.com>");
MODULE_AUTHOR("Grzegorz Jaszczyk <grzegorz.jaszczyk@linaro.org>");
MODULE_AUTHOR("Puranjay Mohan <p-mohan@ti.com>");
MODULE_AUTHOR("Md Danish Anwar <danishanwar@ti.com>");
MODULE_DESCRIPTION("PRU-ICSS Remote Processor Driver");
MODULE_LICENSE("GPL v2");

30
include/linux/remoteproc/pruss.h
View File

@ -28,4 +28,34 @@ enum pruss_pru_id {
PRUSS_NUM_PRUS,
};
struct device_node;
#if IS_ENABLED(CONFIG_PRU_REMOTEPROC)
struct rproc *pru_rproc_get(struct device_node *np, int index,
enum pruss_pru_id *pru_id);
void pru_rproc_put(struct rproc *rproc);
#else
static inline struct rproc *
pru_rproc_get(struct device_node *np, int index, enum pruss_pru_id *pru_id)
{
return ERR_PTR(-EOPNOTSUPP);
}
static inline void pru_rproc_put(struct rproc *rproc) { }
#endif /* CONFIG_PRU_REMOTEPROC */
static inline bool is_pru_rproc(struct device *dev)
{
const char *drv_name = dev_driver_string(dev);
if (strncmp(drv_name, PRU_RPROC_DRVNAME, sizeof(PRU_RPROC_DRVNAME)))
return false;
return true;
}
#endif /* __LINUX_PRUSS_H */