diff options
Diffstat (limited to 'drivers/staging/vc04_services/interface/vchiq_arm/vchiq_core.h')
| -rw-r--r-- | drivers/staging/vc04_services/interface/vchiq_arm/vchiq_core.h | 38 |
1 files changed, 28 insertions, 10 deletions
diff --git a/drivers/staging/vc04_services/interface/vchiq_arm/vchiq_core.h b/drivers/staging/vc04_services/interface/vchiq_arm/vchiq_core.h index 8b4a38f5b3f2..ec1a3caefaea 100644 --- a/drivers/staging/vc04_services/interface/vchiq_arm/vchiq_core.h +++ b/drivers/staging/vc04_services/interface/vchiq_arm/vchiq_core.h @@ -10,8 +10,8 @@ #include <linux/kref.h> #include <linux/rcupdate.h> #include <linux/wait.h> -#include <linux/raspberrypi/vchiq.h> +#include "../../include/linux/raspberrypi/vchiq.h" #include "vchiq_cfg.h" /* Do this so that we can test-build the code on non-rpi systems */ @@ -166,6 +166,24 @@ struct vchiq_bulk_queue { struct vchiq_bulk bulks[VCHIQ_NUM_SERVICE_BULKS]; }; +/* + * Remote events provide a way of presenting several virtual doorbells to a + * peer (ARM host to VPU) using only one physical doorbell. They can be thought + * of as a way for the peer to signal a semaphore, in this case implemented as + * a workqueue. + * + * Remote events remain signalled until acknowledged by the receiver, and they + * are non-counting. They are designed in such a way as to minimise the number + * of interrupts and avoid unnecessary waiting. + * + * A remote_event is as small data structures that live in shared memory. It + * comprises two booleans - armed and fired: + * + * The sender sets fired when they signal the receiver. + * If fired is set, the receiver has been signalled and need not wait. + * The receiver sets the armed field before they begin to wait. + * If armed is set, the receiver is waiting and wishes to be woken by interrupt. + */ struct remote_event { int armed; int fired; @@ -458,7 +476,7 @@ vchiq_init_slots(void *mem_base, int mem_size); extern int vchiq_init_state(struct vchiq_state *state, struct vchiq_slot_zero *slot_zero, struct device *dev); -extern enum vchiq_status +extern int vchiq_connect_internal(struct vchiq_state *state, struct vchiq_instance *instance); struct vchiq_service * @@ -467,10 +485,10 @@ vchiq_add_service_internal(struct vchiq_state *state, int srvstate, struct vchiq_instance *instance, void (*userdata_term)(void *userdata)); -extern enum vchiq_status +extern int vchiq_open_service_internal(struct vchiq_service *service, int client_id); -extern enum vchiq_status +extern int vchiq_close_service_internal(struct vchiq_service *service, int close_recvd); extern void @@ -485,7 +503,7 @@ vchiq_shutdown_internal(struct vchiq_state *state, struct vchiq_instance *instan extern void remote_event_pollall(struct vchiq_state *state); -extern enum vchiq_status +extern int vchiq_bulk_transfer(struct vchiq_instance *instance, unsigned int handle, void *offset, void __user *uoffset, int size, void *userdata, enum vchiq_bulk_mode mode, enum vchiq_bulk_dir dir); @@ -536,7 +554,7 @@ vchiq_service_get(struct vchiq_service *service); extern void vchiq_service_put(struct vchiq_service *service); -extern enum vchiq_status +extern int vchiq_queue_message(struct vchiq_instance *instance, unsigned int handle, ssize_t (*copy_callback)(void *context, void *dest, size_t offset, size_t maxsize), @@ -568,13 +586,13 @@ void vchiq_on_remote_release(struct vchiq_state *state); int vchiq_platform_init_state(struct vchiq_state *state); -enum vchiq_status vchiq_check_service(struct vchiq_service *service); +int vchiq_check_service(struct vchiq_service *service); void vchiq_on_remote_use_active(struct vchiq_state *state); -enum vchiq_status vchiq_send_remote_use(struct vchiq_state *state); +int vchiq_send_remote_use(struct vchiq_state *state); -enum vchiq_status vchiq_send_remote_use_active(struct vchiq_state *state); +int vchiq_send_remote_use_active(struct vchiq_state *state); void vchiq_platform_conn_state_changed(struct vchiq_state *state, enum vchiq_connstate oldstate, @@ -584,7 +602,7 @@ void vchiq_set_conn_state(struct vchiq_state *state, enum vchiq_connstate newsta void vchiq_log_dump_mem(const char *label, u32 addr, const void *void_mem, size_t num_bytes); -enum vchiq_status vchiq_remove_service(struct vchiq_instance *instance, unsigned int service); +int vchiq_remove_service(struct vchiq_instance *instance, unsigned int service); int vchiq_get_client_id(struct vchiq_instance *instance, unsigned int service); |