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/*
* Copyright (C) 2016 Texas Instruments Incorporated - http://www.ti.com/
*
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* * Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the
* distribution.
*
* * Neither the name of Texas Instruments Incorporated nor the names of
* its contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
/**
* File : pru_rpmsg.c
*
* Summary : An RPMsg implementation for the PRU to use while communicating
* with the ARM host.
*
* Notes :
* - Implementaion of the interface described in "pru_rpmsg.h"
*/
#include <pru_rpmsg.h>
struct pru_rpmsg_hdr {
uint32_t src;
uint32_t dst;
uint32_t reserved;
uint16_t len;
uint16_t flags;
uint8_t data[0];
};
struct pru_rpmsg_ns_msg {
char name[RPMSG_NAME_SIZE];
uint32_t addr;
uint32_t flags;
};
int16_t pru_rpmsg_init(
struct pru_rpmsg_transport *transport,
struct fw_rsc_vdev_vring *vring0,
struct fw_rsc_vdev_vring *vring1,
uint32_t to_arm_event,
uint32_t from_arm_event
)
{
if (to_arm_event > MAX_VALID_EVENT || to_arm_event < MIN_VALID_EVENT)
return PRU_RPMSG_INVALID_EVENT;
if (from_arm_event > MAX_VALID_EVENT || from_arm_event < MIN_VALID_EVENT)
return PRU_RPMSG_INVALID_EVENT;
pru_virtqueue_init(&transport->virtqueue0, vring0, to_arm_event, from_arm_event);
pru_virtqueue_init(&transport->virtqueue1, vring1, to_arm_event, from_arm_event);
return PRU_RPMSG_SUCCESS;
}
int16_t pru_rpmsg_send(
struct pru_rpmsg_transport *transport,
uint32_t src,
uint32_t dst,
void *data,
uint16_t len
)
{
struct pru_rpmsg_hdr *msg;
uint32_t msg_len;
int16_t head;
struct pru_virtqueue *virtqueue;
/*
* The length of our payload is larger than the maximum RPMsg buffer size
* allowed
*/
if (len > (RPMSG_BUF_SIZE - sizeof(struct pru_rpmsg_hdr)))
return PRU_RPMSG_BUF_TOO_SMALL;
virtqueue = &transport->virtqueue0;
/* Get an available buffer */
head = pru_virtqueue_get_avail_buf(virtqueue, (void **)&msg, &msg_len);
if (head < 0)
return PRU_RPMSG_NO_BUF_AVAILABLE;
/* Copy local data buffer to the descriptor buffer address */
memcpy(msg->data, data, len);
msg->len = len;
msg->dst = dst;
msg->src = src;
msg->flags = 0;
msg->reserved = 0;
/* Add the used buffer */
if (pru_virtqueue_add_used_buf(virtqueue, head, msg_len) < 0)
return PRU_RPMSG_INVALID_HEAD;
/* Kick the ARM host */
pru_virtqueue_kick(virtqueue);
return PRU_RPMSG_SUCCESS;
}
int16_t pru_rpmsg_receive(
struct pru_rpmsg_transport *transport,
uint16_t *src,
uint16_t *dst,
void *data,
uint16_t *len
)
{
int16_t head;
struct pru_rpmsg_hdr *msg;
uint32_t msg_len;
struct pru_virtqueue *virtqueue;
virtqueue = &transport->virtqueue1;
/* Get an available buffer */
head = pru_virtqueue_get_avail_buf(virtqueue, (void **)&msg, &msg_len);
if (head < 0)
return PRU_RPMSG_NO_BUF_AVAILABLE;
/* Copy the message payload to the local data buffer provided */
memcpy(data, msg->data, msg->len);
*src = msg->src;
*dst = msg->dst;
*len = msg->len;
/* Add the used buffer */
if (pru_virtqueue_add_used_buf(virtqueue, head, msg_len) < 0)
return PRU_RPMSG_INVALID_HEAD;
/* Kick the ARM host */
pru_virtqueue_kick(virtqueue);
return PRU_RPMSG_SUCCESS;
}
int16_t pru_rpmsg_channel(
enum pru_rpmsg_ns_flags flags,
struct pru_rpmsg_transport *transport,
char *name,
int32_t port
)
{
struct pru_rpmsg_ns_msg ns_msg;
uint8_t i;
for (i = 0; i < RPMSG_NAME_SIZE; i++) {
ns_msg.name[i] = name[i];
}
ns_msg.addr = port;
ns_msg.flags = flags;
return pru_rpmsg_send(transport, port, 53, &ns_msg, sizeof(ns_msg));
}
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