[PATCH v5 07/11] firmware: imx: init-fw api exchange on imx93

[Pankaj Gupta]

On imx93 platforms, exchange init-fw message with enclave's firmware
is to be done.

Signed-off-by: Pankaj Gupta <pankaj.gupta@xxxxxxx>
---
 drivers/firmware/imx/Makefile           |  2 +-
 drivers/firmware/imx/ele_fw_api.c       | 56 +++++++++++++++++++++++++
 drivers/firmware/imx/se_fw.c            | 11 +++++
 include/linux/firmware/imx/ele_fw_api.h | 19 +++++++++
 4 files changed, 87 insertions(+), 1 deletion(-)
 create mode 100644 drivers/firmware/imx/ele_fw_api.c
 create mode 100644 include/linux/firmware/imx/ele_fw_api.h

diff --git a/drivers/firmware/imx/Makefile b/drivers/firmware/imx/Makefile
index eab3f03e2e5e..bc6ed5514a19 100644
--- a/drivers/firmware/imx/Makefile
+++ b/drivers/firmware/imx/Makefile
@@ -2,5 +2,5 @@
 obj-$(CONFIG_IMX_DSP)		+= imx-dsp.o
 obj-$(CONFIG_IMX_SCU)		+= imx-scu.o misc.o imx-scu-irq.o rm.o imx-scu-soc.o
 obj-$(CONFIG_IMX_SCU_PD)	+= scu-pd.o
-sec_enclave-objs		= se_fw.o ele_common.o ele_base_msg.o
+sec_enclave-objs		= se_fw.o ele_common.o ele_base_msg.o ele_fw_api.o
 obj-${CONFIG_IMX_SEC_ENCLAVE}	+= sec_enclave.o
diff --git a/drivers/firmware/imx/ele_fw_api.c b/drivers/firmware/imx/ele_fw_api.c
new file mode 100644
index 000000000000..1df1fbcb6d9e
--- /dev/null
+++ b/drivers/firmware/imx/ele_fw_api.c
@@ -0,0 +1,56 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Copyright 2023 NXP
+ */
+
+#include <linux/dma-mapping.h>
+#include <linux/firmware/imx/ele_fw_api.h>
+
+#include "ele_common.h"
+
+/* Fill a command message header with a given command ID and length in bytes. */
+static int plat_fill_cmd_msg_hdr(struct ele_mu_priv *priv,
+				 struct mu_hdr *hdr,
+				 uint8_t cmd, uint32_t len)
+{
+	int err = 0;
+
+	hdr->tag = priv->cmd_tag;
+	hdr->ver = MESSAGING_VERSION_7;
+	hdr->command = cmd;
+	hdr->size = (uint8_t)(len / sizeof(uint32_t));
+
+	return err;
+}
+
+int ele_init_fw(struct device *dev)
+{
+	struct ele_mu_priv *priv = dev_get_drvdata(dev);
+	int ret;
+	unsigned int tag, command, size, ver, status;
+
+	ret = plat_fill_cmd_msg_hdr(priv,
+				    (struct mu_hdr *)&priv->tx_msg.header,
+				    ELE_INIT_FW_REQ, 4);
+	if (ret)
+		return ret;
+
+	ret = imx_ele_msg_send_rcv(priv);
+	if (ret < 0)
+		return ret;
+
+	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_INIT_FW_REQ
+		&& size == ELE_INIT_FW_RSP_SZ
+		&& ver == MESSAGING_VERSION_7
+		&& status == priv->success_tag)
+		return 0;
+
+	return -EINVAL;
+}
diff --git a/drivers/firmware/imx/se_fw.c b/drivers/firmware/imx/se_fw.c
index 2c97b2adf18b..88300c41d62b 100644
--- a/drivers/firmware/imx/se_fw.c
+++ b/drivers/firmware/imx/se_fw.c
@@ -8,6 +8,7 @@
 #include <linux/dev_printk.h>
 #include <linux/errno.h>
 #include <linux/export.h>
+#include <linux/firmware/imx/ele_fw_api.h>
 #include <linux/firmware/imx/ele_base_msg.h>
 #include <linux/firmware/imx/ele_mu_ioctl.h>
 #include <linux/genalloc.h>
@@ -41,6 +42,7 @@ struct imx_info {
 	uint8_t *se_name;
 	uint8_t *pool_name;
 	bool reserved_dma_ranges;
+	bool init_fw;
 };
 
 static LIST_HEAD(priv_data_list);
@@ -55,6 +57,7 @@ static const struct imx_info imx8ulp_info = {
 	.se_name = "ele",
 	.pool_name = "sram-pool",
 	.reserved_dma_ranges = true,
+	.init_fw = false,
 };
 
 static const struct imx_info imx93_info = {
@@ -67,6 +70,7 @@ static const struct imx_info imx93_info = {
 	.se_name = "ele",
 	.pool_name = NULL,
 	.reserved_dma_ranges = true,
+	.init_fw = true,
 };
 
 static const struct of_device_id se_fw_match[] = {
@@ -1120,6 +1124,13 @@ static int se_fw_probe(struct platform_device *pdev)
 		priv->flags |= RESERVED_DMA_POOL;
 	}
 
+	if (info->init_fw) {
+		/* start initializing ele fw */
+		ret = ele_init_fw(dev);
+		if (ret)
+			dev_err(dev, "Failed to initialize ele fw.\n");
+	}
+
 	if (info->socdev) {
 		ret = imx_soc_device_register(dev, info);
 		if (ret) {
diff --git a/include/linux/firmware/imx/ele_fw_api.h b/include/linux/firmware/imx/ele_fw_api.h
new file mode 100644
index 000000000000..36c3f743cb38
--- /dev/null
+++ b/include/linux/firmware/imx/ele_fw_api.h
@@ -0,0 +1,19 @@
+/* SPDX-License-Identifier: GPL-2.0+ */
+/*
+ * Copyright 2023 NXP
+ */
+
+#ifndef ELE_FW_API_H
+#define ELE_FW_API_H
+
+#include <linux/hw_random.h>
+
+#define MESSAGING_VERSION_7		0x7
+
+#define ELE_INIT_FW_REQ                 0x17
+#define ELE_INIT_FW_RSP_SZ              0x2
+
+
+int ele_init_fw(struct device *dev);
+
+#endif /* ELE_FW_API_H */
-- 
2.34.1