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ti: k3: drivers: sec_proxy: Allow clearing a Secure Proxy receive thread 

It can be needed to discard all messages in a receive queue. This
can be used during some error recovery situations.

Signed-off-by: Andrew F. Davis <afd@ti.com>
Acked-by: Nishanth Menon <nm@ti.com>
This commit is contained in:
Andrew F. Davis 2019-01-04 12:44:00 -06:00
parent c40c88f81b
commit 2004552e62
2 changed files with 47 additions and 0 deletions
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38
plat/ti/k3/common/drivers/sec_proxy/sec_proxy.c
View File

@ -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

9
plat/ti/k3/common/drivers/sec_proxy/sec_proxy.h
View File

@ -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