diff --git a/plat/ti/k3/common/drivers/sec_proxy/sec_proxy.c b/plat/ti/k3/common/drivers/sec_proxy/sec_proxy.c index 5dd54d4ff..4924b13b9 100644 --- a/plat/ti/k3/common/drivers/sec_proxy/sec_proxy.c +++ b/plat/ti/k3/common/drivers/sec_proxy/sec_proxy.c @@ -162,6 +162,44 @@ static inline int k3_sec_proxy_verify_thread(struct k3_sec_proxy_thread *spt, return 0; } +/** + * k3_sec_proxy_clear_rx_thread() - Clear Secure Proxy thread + * + * @id: Channel Identifier + * + * Return: 0 if all goes well, else appropriate error message + */ +int k3_sec_proxy_clear_rx_thread(enum k3_sec_proxy_chan_id id) +{ + struct k3_sec_proxy_thread *spt = &spm.threads[id]; + + /* Check for any errors already available */ + if (mmio_read_32(spt->rt + RT_THREAD_STATUS) & + RT_THREAD_STATUS_ERROR_MASK) { + ERROR("Thread %d is corrupted, cannot send data\n", spt->id); + return -EINVAL; + } + + /* Make sure thread is configured for right direction */ + if (!(mmio_read_32(spt->scfg + SCFG_THREAD_CTRL) & SCFG_THREAD_CTRL_DIR_MASK)) { + ERROR("Cannot clear a transmit thread %d\n", spt->id); + return -EINVAL; + } + + /* Read off messages from thread until empty */ + uint32_t try_count = 10; + while (mmio_read_32(spt->rt + RT_THREAD_STATUS) & RT_THREAD_STATUS_CUR_CNT_MASK) { + if (!(try_count--)) { + ERROR("Could not clear all messages from thread %d\n", spt->id); + return -ETIMEDOUT; + } + WARN("Clearing message from thread %d\n", spt->id); + mmio_read_32(spt->data + spm.desc.data_end_offset); + } + + return 0; +} + /** * k3_sec_proxy_send() - Send data over a Secure Proxy thread * @id: Channel Identifier diff --git a/plat/ti/k3/common/drivers/sec_proxy/sec_proxy.h b/plat/ti/k3/common/drivers/sec_proxy/sec_proxy.h index 2d987f83a..6c4f5dfff 100644 --- a/plat/ti/k3/common/drivers/sec_proxy/sec_proxy.h +++ b/plat/ti/k3/common/drivers/sec_proxy/sec_proxy.h @@ -37,6 +37,15 @@ struct k3_sec_proxy_msg { uint8_t *buf; }; +/** + * k3_sec_proxy_send() - Send data over a Secure Proxy thread + * @id: Channel Identifier + * @msg: Pointer to k3_sec_proxy_msg + * + * Return: 0 if all goes well, else appropriate error message + */ +int k3_sec_proxy_clear_rx_thread(enum k3_sec_proxy_chan_id id); + /** * k3_sec_proxy_send() - Send data over a Secure Proxy thread * @id: Channel Identifier