pussuw commented on code in PR #16387:
URL: https://github.com/apache/nuttx/pull/16387#discussion_r2092611969
##########
arch/arm64/src/imx9/imx9_ele.c:
##########
@@ -387,3 +391,103 @@ int imx9_ele_verify_image(uint32_t img_id, uint32_t
*response)
return -EIO;
}
+
+int imx9_ele_start_rng(void)
+{
+ msg.header.version = ELE_VERSION;
+ msg.header.tag = ELE_CMD_TAG;
+ msg.header.size = 1;
+ msg.header.command = ELE_START_RNG_REQ;
+
+ imx9_ele_sendmsg(&msg);
+ imx9_ele_receivemsg(&msg);
+
+ if ((msg.data[0] & 0xff) == ELE_OK)
+ {
+ return 0;
+ }
+
+ return -EIO;
+}
+
+int imx9_ele_get_trng_state(void)
+{
+ msg.header.version = ELE_VERSION;
+ msg.header.tag = ELE_CMD_TAG;
+ msg.header.size = 1;
+ msg.header.command = ELE_GET_TRNG_STATE_REQ;
+
+ imx9_ele_sendmsg(&msg);
+ imx9_ele_receivemsg(&msg);
+
+ if ((msg.data[0] & 0xff) == ELE_OK)
+ {
+ struct ele_trng_state *ele_trng =
+ (struct ele_trng_state *)(msg.data + 1);
+ if (ele_trng->trng_state != ELE_TRNG_STATUS_READY ||
+ ele_trng->csal_state != ELE_CSAL_STATUS_READY)
+ {
+ /* Ensure imx9_ele_start_rng() was called earlier or we will
+ * end up here.
+ */
+
+ return -EBUSY;
+ }
+ else
+ {
+ return 0;
+ }
+ }
+
+ return -EIO;
+}
+
+int imx9_ele_get_random(uint32_t paddr, size_t len)
+{
+ uint16_t counter = 0;
+ uint16_t max_tries = ELE_RNG_TIMEOUT_US / ELE_RNG_SLEEP_US;
+
+ if (paddr == 0 || len == 0)
+ {
+ _err("Wrong input parameters!\n");
+ return -EINVAL;
+ }
+
+ while ((imx9_ele_get_trng_state() != 0))
+ {
+ if (counter > max_tries)
+ {
+ _err("Timed out after %hu iterations!\n", counter);
+ return -EBUSY;
+ }
+
+ usleep(ELE_RNG_SLEEP_US);
+ counter++;
+ }
+
+ /* Flush the cache before sending the request to ELE. */
+
+ up_flush_dcache((uintptr_t)paddr, (uintptr_t)(paddr + len));
+
+ msg.header.version = ELE_VERSION_FW;
+ msg.header.tag = ELE_CMD_TAG;
+ msg.header.size = 4;
+ msg.header.command = ELE_GET_RNG_REQ;
+ msg.data[0] = 0;
+ msg.data[1] = paddr;
+ msg.data[2] = len;
+
+ imx9_ele_sendmsg(&msg);
+ imx9_ele_receivemsg(&msg);
+
+ if ((msg.data[0] & 0xff) == ELE_OK)
+ {
+ /* Invalidate the cache so we can read the result from RAM. */
+
+ up_invalidate_dcache((uintptr_t)paddr,
Review Comment:
Cache ops deal with virtual addresses, is this an issue, or is paddr=vaddr ?
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