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arch/arm64/imx9: Extend ELE API with RNG support
- Add ELE command to initialize the ELE RNG context. - Add ELE command to poll the readiness of the RNG - Add ELE command to obtain random numbers. - Replace AHAB_ prefixes with ELE_ - Cleanup header includes - Added some explanatory comments on .../hardware/imx9_ele.h Signed-off-by: Theodore Karatapanis <tkaratapanis@census-labs.com>
This commit is contained in:
Theodore Karatapanis
Alan C. Assis
parent
e115c4364e
commit
fcbd3099aa
3 changed files with 203 additions and 34 deletions
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@ -28,24 +28,35 @@
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****************************************************************************/
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#include <hardware/imx9_memorymap.h>
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#include <stdint.h>
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/****************************************************************************
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* Pre-processor Definitions
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****************************************************************************/
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#define ELE_MAX_MSG 255U
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#define AHAB_VERSION 0x6
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#define AHAB_CMD_TAG 0x17
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#define AHAB_RESP_TAG 0xe1
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#define ELE_RELEASE_RDC_REQ 0xc4
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#define ELE_READ_FUSE_REQ 0x97
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#define ELE_GET_EVENTS_REQ 0xa2
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#define ELE_CMD_TAG 0x17
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#define ELE_VERSION 0x6
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#define ELE_VERSION_FW 0x7
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#define ELE_RESP_TAG 0xe1
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#define ELE_OK 0xd6
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/* ELE commands. */
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#define ELE_DERIVE_KEY_REQ 0xa9
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#define ELE_GET_EVENTS_REQ 0xa2
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#define ELE_GET_TRNG_STATE_REQ 0xa4
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#define ELE_GET_RNG_REQ 0xcd
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#define ELE_FWD_LIFECYCLE_UP_REQ 0x95
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#define ELE_OEM_CNTN_AUTH_REQ 0x87
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#define ELE_VERIFY_IMAGE_REQ 0x88
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#define ELE_READ_FUSE_REQ 0x97
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#define ELE_RELEASE_CONTAINER_REQ 0x89
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#define ELE_OK 0xd6
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#define ELE_RELEASE_RDC_REQ 0xc4
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#define ELE_START_RNG_REQ 0xa3
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#define ELE_VERIFY_IMAGE_REQ 0x88
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/* Messaging Unit registers. */
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#define ELE_MU_TCR (IMX9_S3MUA_BASE + 0x120)
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#define ELE_MU_TSR (IMX9_S3MUA_BASE + 0x124)
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@ -57,8 +68,14 @@
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#define ELE_MU_TR(i) (IMX9_S3MUA_BASE + 0x200 + (i) * 4)
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#define ELE_MU_RR(i) (IMX9_S3MUA_BASE + 0x280 + (i) * 4)
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/* Fuse and Status Block lifecycle register. */
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#define FSB_LC_REG 0x4751041cUL
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/****************************************************************************
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* Public Types
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****************************************************************************/
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struct ele_header_t
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{
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union
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@ -24,16 +24,8 @@
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* Included Files
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****************************************************************************/
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#include <nuttx/config.h>
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#include <stdint.h>
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#include <stdbool.h>
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#include <errno.h>
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#include <nuttx/arch.h>
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#include <nuttx/clock.h>
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#include <debug.h>
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#include <arch/board/board.h>
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#include <errno.h>
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#include "chip.h"
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#include "arm64_internal.h"
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@ -52,12 +44,24 @@
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#define upper_32_bits(n) ((uint32_t)(((n) >> 16) >> 16))
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#define lower_32_bits(n) ((uint32_t)(n))
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#define ELE_RNG_TIMEOUT_US 5000
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#define ELE_RNG_SLEEP_US 100
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#define ELE_TRNG_STATUS_READY 0x3
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#define ELE_CSAL_STATUS_READY 0x2
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/****************************************************************************
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* Private Types
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****************************************************************************/
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struct ele_msg msg;
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struct ele_trng_state
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{
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uint8_t trng_state;
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uint8_t csal_state;
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uint16_t reserved;
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};
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/****************************************************************************
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* Private Function Prototypes
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****************************************************************************/
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@ -154,8 +158,8 @@ void imx9_ele_init(void)
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int imx9_ele_release_rdc(uint32_t rdc_id)
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{
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msg.header.version = AHAB_VERSION;
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msg.header.tag = AHAB_CMD_TAG;
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msg.header.version = ELE_VERSION;
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msg.header.tag = ELE_CMD_TAG;
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msg.header.size = 2;
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msg.header.command = ELE_RELEASE_RDC_REQ;
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msg.data[0] = rdc_id;
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@ -175,8 +179,8 @@ uint32_t imx9_ele_read_common_fuse(uint32_t fuse_id)
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{
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uint32_t value = 0;
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msg.header.version = AHAB_VERSION;
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msg.header.tag = AHAB_CMD_TAG;
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msg.header.version = ELE_VERSION;
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msg.header.tag = ELE_CMD_TAG;
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msg.header.size = 2;
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msg.header.command = ELE_READ_FUSE_REQ;
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msg.data[0] = fuse_id;
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@ -225,8 +229,8 @@ int imx9_ele_get_key(uint8_t *key, size_t key_size,
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return -EINVAL;
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}
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msg.header.version = AHAB_VERSION;
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msg.header.tag = AHAB_CMD_TAG;
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msg.header.version = ELE_VERSION;
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msg.header.tag = ELE_CMD_TAG;
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msg.header.size = 7;
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msg.header.command = ELE_DERIVE_KEY_REQ;
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msg.data[0] = upper_32_bits((ulong)key);
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@ -264,8 +268,8 @@ int imx9_ele_get_events(uint32_t *buffer, size_t buffer_size)
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size_t events_num;
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size_t i;
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msg.header.version = AHAB_VERSION;
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msg.header.tag = AHAB_CMD_TAG;
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msg.header.version = ELE_VERSION;
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msg.header.tag = ELE_CMD_TAG;
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msg.header.size = 1;
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msg.header.command = ELE_GET_EVENTS_REQ;
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@ -295,8 +299,8 @@ int imx9_ele_get_events(uint32_t *buffer, size_t buffer_size)
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int imx9_ele_close_device(void)
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{
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msg.header.version = AHAB_VERSION;
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msg.header.tag = AHAB_CMD_TAG;
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msg.header.version = ELE_VERSION;
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msg.header.tag = ELE_CMD_TAG;
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msg.header.size = 2;
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msg.header.command = ELE_FWD_LIFECYCLE_UP_REQ;
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msg.data[0] = 0x08;
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@ -319,8 +323,8 @@ uint32_t imx9_ele_get_lifecycle(void)
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int imx9_ele_auth_oem_ctnr(unsigned long ctnr_addr, uint32_t *response)
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{
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msg.header.version = AHAB_VERSION;
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msg.header.tag = AHAB_CMD_TAG;
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msg.header.version = ELE_VERSION;
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msg.header.tag = ELE_CMD_TAG;
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msg.header.size = 3;
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msg.header.command = ELE_OEM_CNTN_AUTH_REQ;
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msg.data[0] = upper_32_bits(ctnr_addr);
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@ -343,8 +347,8 @@ int imx9_ele_auth_oem_ctnr(unsigned long ctnr_addr, uint32_t *response)
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int imx9_ele_release_container(uint32_t *response)
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{
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msg.header.version = AHAB_VERSION;
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msg.header.tag = AHAB_CMD_TAG;
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msg.header.version = ELE_VERSION;
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msg.header.tag = ELE_CMD_TAG;
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msg.header.size = 1;
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msg.header.command = ELE_RELEASE_CONTAINER_REQ;
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@ -366,8 +370,8 @@ int imx9_ele_release_container(uint32_t *response)
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int imx9_ele_verify_image(uint32_t img_id, uint32_t *response)
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{
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msg.header.version = AHAB_VERSION;
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msg.header.tag = AHAB_CMD_TAG;
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msg.header.version = ELE_VERSION;
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msg.header.tag = ELE_CMD_TAG;
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msg.header.size = 2;
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msg.header.command = ELE_VERIFY_IMAGE_REQ;
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msg.data[0] = 1 << img_id;
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@ -387,3 +391,103 @@ int imx9_ele_verify_image(uint32_t img_id, uint32_t *response)
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return -EIO;
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}
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int imx9_ele_start_rng(void)
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{
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msg.header.version = ELE_VERSION;
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msg.header.tag = ELE_CMD_TAG;
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msg.header.size = 1;
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msg.header.command = ELE_START_RNG_REQ;
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imx9_ele_sendmsg(&msg);
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imx9_ele_receivemsg(&msg);
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if ((msg.data[0] & 0xff) == ELE_OK)
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{
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return 0;
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}
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return -EIO;
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}
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int imx9_ele_get_trng_state(void)
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{
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msg.header.version = ELE_VERSION;
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msg.header.tag = ELE_CMD_TAG;
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msg.header.size = 1;
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msg.header.command = ELE_GET_TRNG_STATE_REQ;
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imx9_ele_sendmsg(&msg);
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imx9_ele_receivemsg(&msg);
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if ((msg.data[0] & 0xff) == ELE_OK)
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{
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struct ele_trng_state *ele_trng =
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(struct ele_trng_state *)(msg.data + 1);
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if (ele_trng->trng_state != ELE_TRNG_STATUS_READY ||
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ele_trng->csal_state != ELE_CSAL_STATUS_READY)
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{
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/* Ensure imx9_ele_start_rng() was called earlier or we will
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* end up here.
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*/
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return -EBUSY;
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}
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else
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{
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return 0;
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}
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}
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return -EIO;
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}
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int imx9_ele_get_random(uint32_t paddr, size_t len)
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{
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uint16_t counter = 0;
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uint16_t max_tries = ELE_RNG_TIMEOUT_US / ELE_RNG_SLEEP_US;
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if (paddr == 0 || len == 0)
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{
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_err("Wrong input parameters!\n");
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return -EINVAL;
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}
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while ((imx9_ele_get_trng_state() != 0))
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{
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if (counter > max_tries)
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{
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_err("Timed out after %hu iterations!\n", counter);
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return -EBUSY;
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}
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usleep(ELE_RNG_SLEEP_US);
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counter++;
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}
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/* Flush the cache before sending the request to ELE. */
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up_flush_dcache((uintptr_t)paddr, (uintptr_t)(paddr + len));
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msg.header.version = ELE_VERSION_FW;
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msg.header.tag = ELE_CMD_TAG;
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msg.header.size = 4;
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msg.header.command = ELE_GET_RNG_REQ;
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msg.data[0] = 0;
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msg.data[1] = paddr;
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msg.data[2] = len;
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imx9_ele_sendmsg(&msg);
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imx9_ele_receivemsg(&msg);
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if ((msg.data[0] & 0xff) == ELE_OK)
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{
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/* Invalidate the cache so we can read the result from RAM. */
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up_invalidate_dcache((uintptr_t)paddr,
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(uintptr_t)(paddr + len));
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return 0;
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}
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return -EIO;
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}
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@ -27,8 +27,9 @@
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* Included Files
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****************************************************************************/
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#include <nuttx/config.h>
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#include "hardware/imx9_ele.h"
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#include <sys/types.h>
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#include <stdint.h>
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/****************************************************************************
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* Public Function Prototypes
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@ -219,4 +220,51 @@ int imx9_ele_release_container(uint32_t *response);
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****************************************************************************/
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int imx9_ele_verify_image(uint32_t img_id, uint32_t *response);
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/****************************************************************************
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* Name: imx9_ele_start_rng
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*
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* Description:
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* Sends command to initialize the ELE RNG context.
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*
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* Returned Value:
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* Zero (OK) is returned for success. A negated errno value is returned on
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* failure.
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*
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****************************************************************************/
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int imx9_ele_start_rng(void);
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/****************************************************************************
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* Name: imx9_ele_get_trng_state
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*
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* Description:
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* Query the state of the True Random Number Generator.
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*
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* Returned Value:
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* Zero is returned if the Random Number Generator (RNG) is ready for use.
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* A negated errno value (-EBUSY) or another is returned on failure.
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*
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****************************************************************************/
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int imx9_ele_get_trng_state(void);
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/****************************************************************************
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* Name: imx9_ele_get_random
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*
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* Description:
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* Request from the ELE the generation of a random number of specified
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* length.
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*
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* Input Parameters:
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* paddr - 32bit physical address to store the random number.
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* len - Length in bytes of the random number.
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*
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* Returned Value:
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* Zero is returned if ELE successfully generated the random number.
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* A negated errno value (-EBUSY) or another is returned on failure.
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*
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****************************************************************************/
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int imx9_ele_get_random(uint32_t paddr, size_t len);
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#endif /* __ARCH_ARM64_SRC_IMX9_IMX9_ELE_H */
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