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bus: stm32_firewall: add stm32_firewall_get_grant_all_access() API

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Add the stm32_firewall_get_grant_all_access() API to be able to fetch
all firewall references in an access-controllers property and try to grant
access to all of them.

Signed-off-by: Gatien Chevallier <gatien.chevallier@foss.st.com>
Reviewed-by: Linus Walleij <linusw@kernel.org>
Link: https://lore.kernel.org/r/20260226-debug_bus-v6-5-5d794697798d@foss.st.com
Signed-off-by: Alexandre Torgue <alexandre.torgue@foss.st.com>
This commit is contained in:
Gatien Chevallier
2026-02-26 11:30:20 +01:00
committed by Alexandre Torgue
parent 892320d203
commit 4ea96cfc72
2 changed files with 68 additions and 0 deletions
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42
drivers/bus/stm32_firewall.c
View File

@@ -184,6 +184,48 @@ void stm32_firewall_release_access_by_id(struct stm32_firewall *firewall, u32 su
}
EXPORT_SYMBOL_GPL(stm32_firewall_release_access_by_id);
int stm32_firewall_get_grant_all_access(struct device *dev, struct stm32_firewall **firewall,
int *nb_firewall)
{
struct stm32_firewall *loc_firewall;
int err;
int i;
*nb_firewall = of_count_phandle_with_args(dev->of_node, "access-controllers",
"#access-controller-cells");
if (*nb_firewall < 0)
return *nb_firewall;
if (!*nb_firewall) {
*firewall = NULL;
return 0;
}
loc_firewall = devm_kcalloc(dev, *nb_firewall, sizeof(*loc_firewall), GFP_KERNEL);
if (!loc_firewall)
return -ENOMEM;
/* Get stm32 firewall information */
err = stm32_firewall_get_firewall(dev->of_node, loc_firewall, *nb_firewall);
if (err)
return err;
for (i = 0; i < *nb_firewall; i++) {
err = stm32_firewall_grant_access(&loc_firewall[i]);
if (err) {
while (i--)
stm32_firewall_release_access(&loc_firewall[i]);
return err;
}
}
*firewall = loc_firewall;
return 0;
}
EXPORT_SYMBOL_GPL(stm32_firewall_get_grant_all_access);
/* Firewall controller API */
int stm32_firewall_controller_register(struct stm32_firewall_controller *firewall_controller)

26
include/linux/bus/stm32_firewall_device.h
View File

@@ -112,6 +112,25 @@ int stm32_firewall_grant_access_by_id(struct stm32_firewall *firewall, u32 subsy
*/
void stm32_firewall_release_access_by_id(struct stm32_firewall *firewall, u32 subsystem_id);
/**
* stm32_firewall_get_grant_all_access - Allocate and get all the firewall(s) associated to given
* device. Then, try to grant access rights for each element.
* This function is basically a helper function that wraps
* both stm32_firewall_get_firewall() and
* stm32_firewall_grant_access() on all firewall references of
* a device along with the allocation of the array.
* Realease access using stm32_firewall_release_access* APIs
* when done.
*
* @dev: Device performing the checks
* @firewall: Pointer to the array of firewall references to be allocated
* @nb_firewall: Number of allocated elements in @firewall
*
* Returns 0 on success, or appropriate errno code if error occurred.
*/
int stm32_firewall_get_grant_all_access(struct device *dev, struct stm32_firewall **firewall,
int *nb_firewall);
#else /* CONFIG_STM32_FIREWALL */
static inline int stm32_firewall_get_firewall(struct device_node *np,
@@ -141,5 +160,12 @@ static inline void stm32_firewall_release_access_by_id(struct stm32_firewall *fi
{
}
static inline int stm32_firewall_get_grant_all_access(struct device *dev,
struct stm32_firewall **firewall,
int *nb_firewall)
{
return -ENODEV;
}
#endif /* CONFIG_STM32_FIREWALL */
#endif /* STM32_FIREWALL_DEVICE_H */