[PATCH v5 10/11] firmware: imx: enclave api to read-common-fuses

Pankaj Gupta
2023-08-23T07:37:46Z

Added an API to read the common fuses only accessible to
enclave-firmware.

Signed-off-by: Pankaj Gupta <pankaj.gupta@nxp.com>
---
drivers/firmware/imx/ele_base_msg.c | 80 +++++++++++++++++++++++
include/linux/firmware/imx/ele_base_msg.h | 7 ++
2 files changed, 87 insertions(+)

diff --git a/drivers/firmware/imx/ele_base_msg.c b/drivers/firmware/imx/ele_base_msg.c
index b19ab8abeeb8..9785fcdcc29d 100644
--- a/drivers/firmware/imx/ele_base_msg.c
+++ b/drivers/firmware/imx/ele_base_msg.c
@@ -190,3 +190,83 @@ int ele_service_swap(struct device *dev,

return -EINVAL;
}
+
+static int read_otp_uniq_id(struct ele_mu_priv *priv, u32 *value)
+{
+ unsigned int tag, command, size, ver, status;
+
+ tag = MSG_TAG(priv->rx_msg.header);
+ command = MSG_COMMAND(priv->rx_msg.header);
+ size = MSG_SIZE(priv->rx_msg.header);
+ ver = MSG_VER(priv->rx_msg.header);
+ status = RES_STATUS(priv->rx_msg.data[0]);
+
+ if (tag == priv->rsp_tag &&
+ command == ELE_READ_FUSE_REQ &&
+ size == ELE_READ_FUSE_RSP_MSG_SZ &&
+ ver == ELE_BASE_API_VERSION &&
+ status == priv->success_tag) {
+ value[0] = priv->rx_msg.data[1];
+ value[1] = priv->rx_msg.data[2];
+ value[2] = priv->rx_msg.data[3];
+ value[3] = priv->rx_msg.data[4];
+ return 0;
+ }
+
+ return -EINVAL;
+}
+
+static int read_fuse_word(struct ele_mu_priv *priv, u32 *value)
+{
+ unsigned int tag, command, size, ver, status;
+
+ tag = MSG_TAG(priv->rx_msg.header);
+ command = MSG_COMMAND(priv->rx_msg.header);
+ size = MSG_SIZE(priv->rx_msg.header);
+ ver = MSG_VER(priv->rx_msg.header);
+ status = RES_STATUS(priv->rx_msg.data[0]);
+
+ if (tag == priv->rsp_tag &&
+ command == ELE_READ_FUSE_REQ &&
+ size == ELE_READ_FUSE_REQ_MSG_SZ &&
+ ver == ELE_BASE_API_VERSION &&
+ status == priv->success_tag) {
+ value[0] = priv->rx_msg.data[1];
+ return 0;
+ }
+
+ return -EINVAL;
+}
+
+int read_common_fuse(struct device *dev,
+ uint16_t fuse_id, u32 *value)
+{
+ struct ele_mu_priv *priv = dev_get_drvdata(dev);
+ int err;
+
+ err = plat_fill_cmd_msg_hdr(priv,
+ (struct mu_hdr *)&priv->tx_msg.header,
+ ELE_READ_FUSE_REQ, 8);
+ if (err) {
+ pr_err("Error: plat_fill_cmd_msg_hdr failed.\n");
+ return err;
+ }
+
+ priv->tx_msg.data[0] = fuse_id;
+ err = imx_ele_msg_send_rcv(priv);
+ if (err < 0)
+ return err;
+
+ switch (fuse_id) {
+ case OTP_UNIQ_ID:
+ err = read_otp_uniq_id(priv, value);
+ break;
+ default:
+ err = read_fuse_word(priv, value);
+ break;
+ }
+
+ return err;
+}
+EXPORT_SYMBOL_GPL(read_common_fuse);
+
diff --git a/include/linux/firmware/imx/ele_base_msg.h b/include/linux/firmware/imx/ele_base_msg.h
index 6fbea7a8d7c9..99a135c21f56 100644
--- a/include/linux/firmware/imx/ele_base_msg.h
+++ b/include/linux/firmware/imx/ele_base_msg.h
@@ -47,6 +47,13 @@
#define ELE_IMEM_EXPORT 0x1
#define ELE_IMEM_IMPORT 0x2

+#define ELE_READ_FUSE_REQ 0x97
+#define ELE_READ_FUSE_RSP_MSG_SZ 0x07
+#define ELE_READ_FUSE_REQ_MSG_SZ 0x03
+
+#define OTP_UNIQ_ID 0x01
+#define OTFAD_CONFIG 0x2
+
#define ELE_BASE_API_VERSION 0x6

int ele_get_info(struct device *dev, phys_addr_t addr, u32 data_size);
--
2.34.1