Date:   Thu, 10 Dec 2020 09:48:46 +0100
From:   franck.lenormand@....nxp.com
To:     shawnguo@...nel.org, s.hauer@...gutronix.de, festevam@...il.com
Cc:     franck.lenormand@....nxp.com, kernel@...gutronix.de,
        linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-imx@....com, aisheng.dong@....com, abel.vesa@....com,
        Anson.Huang@....com, linux@...pel-privat.de, daniel.baluta@....com,
        qiangqing.zhang@....com, peng.fan@....com
Subject: [PATCH v4 1/5] firmware: imx: scu-seco: Add Secure Controller APIS

From: Franck LENORMAND <franck.lenormand@....nxp.com>

This patch adds the APIs:
 - imx_sc_seco_build_info: get commit and sha of SECO
 - imx_sc_seco_secvio_enable: enable SNVS IRQ handling
 - imx_sc_seco_secvio_config: configure SNVS register
 - imx_sc_seco_secvio_dgo_config: configure SNVS DGO register

Signed-off-by: Franck LENORMAND <franck.lenormand@....com>
---
 drivers/firmware/imx/Makefile         |   2 +-
 drivers/firmware/imx/imx-scu.c        |   8 +-
 drivers/firmware/imx/seco.c           | 253 ++++++++++++++++++++++++++++++++++
 include/linux/firmware/imx/ipc.h      |   1 +
 include/linux/firmware/imx/sci.h      |   1 +
 include/linux/firmware/imx/svc/seco.h |  73 ++++++++++
 6 files changed, 334 insertions(+), 4 deletions(-)
 create mode 100644 drivers/firmware/imx/seco.c
 create mode 100644 include/linux/firmware/imx/svc/seco.h

diff --git a/drivers/firmware/imx/Makefile b/drivers/firmware/imx/Makefile
index b76acba..f23e2b0 100644
--- a/drivers/firmware/imx/Makefile
+++ b/drivers/firmware/imx/Makefile
@@ -1,4 +1,4 @@
 # SPDX-License-Identifier: GPL-2.0
 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-$(CONFIG_IMX_SCU)		+= imx-scu.o misc.o imx-scu-irq.o rm.o imx-scu-soc.o seco.o
 obj-$(CONFIG_IMX_SCU_PD)	+= scu-pd.o
diff --git a/drivers/firmware/imx/imx-scu.c b/drivers/firmware/imx/imx-scu.c
index dca79ca..bf768d2 100644
--- a/drivers/firmware/imx/imx-scu.c
+++ b/drivers/firmware/imx/imx-scu.c
@@ -241,9 +241,11 @@ int imx_scu_call_rpc(struct imx_sc_ipc *sc_ipc, void *msg, bool have_resp)
 		 * APIs are defined as void function in SCU firmware, so they
 		 * should be treated as return success always.
 		 */
-		if ((saved_svc == IMX_SC_RPC_SVC_MISC) &&
-			(saved_func == IMX_SC_MISC_FUNC_UNIQUE_ID ||
-			 saved_func == IMX_SC_MISC_FUNC_GET_BUTTON_STATUS))
+		if ((saved_svc == IMX_SC_RPC_SVC_MISC &&
+			 (saved_func == IMX_SC_MISC_FUNC_UNIQUE_ID ||
+			  saved_func == IMX_SC_MISC_FUNC_GET_BUTTON_STATUS)) ||
+			(saved_svc == IMX_SC_RPC_SVC_SECO &&
+			 (saved_func == IMX_SC_SECO_FUNC_BUILD_INFO)))
 			ret = 0;
 	}
 
diff --git a/drivers/firmware/imx/seco.c b/drivers/firmware/imx/seco.c
new file mode 100644
index 0000000..fd11bd4
--- /dev/null
+++ b/drivers/firmware/imx/seco.c
@@ -0,0 +1,253 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Copyright 2020 NXP
+ *
+ * File containing client-side RPC functions for the SECO service. These
+ * functions are ported to clients that communicate to the SC.
+ */
+
+#include <linux/firmware/imx/sci.h>
+
+struct imx_sc_msg_seco_get_build_id {
+	struct imx_sc_rpc_msg hdr;
+	u32 version;
+	u32 commit;
+};
+
+/**
+ * imx_sc_seco_build_info() - Get version and commit ID of the SECO
+ *
+ * @ipc: IPC handle
+ * @version: Version of the SECO
+ * @commit: Commit ID of the SECO
+ *
+ * @return Returns 0 for success and < 0 for errors
+ */
+int imx_sc_seco_build_info(struct imx_sc_ipc *ipc, uint32_t *version,
+			   uint32_t *commit)
+{
+	int ret;
+	struct imx_sc_msg_seco_get_build_id msg;
+	struct imx_sc_rpc_msg *hdr = &msg.hdr;
+
+	hdr->ver = IMX_SC_RPC_VERSION;
+	hdr->svc = IMX_SC_RPC_SVC_SECO;
+	hdr->func = IMX_SC_SECO_FUNC_BUILD_INFO;
+	hdr->size = 1;
+
+	ret = imx_scu_call_rpc(ipc, &msg, true);
+	if (ret)
+		return ret;
+
+	if (version)
+		*version = msg.version;
+	if (commit)
+		*commit = msg.commit;
+
+	return 0;
+}
+EXPORT_SYMBOL(imx_sc_seco_build_info);
+
+/**
+ * imx_sc_seco_secvio_enable() - Enable the processing of secvio IRQ from the
+ * SNVS by the SECO
+ *
+ * @ipc: IPC handle
+ *
+ * @return Returns 0 for success and < 0 for errors
+ */
+int imx_sc_seco_secvio_enable(struct imx_sc_ipc *ipc)
+{
+	struct imx_sc_rpc_msg msg;
+	int ret;
+
+	msg.ver = IMX_SC_RPC_VERSION;
+	msg.svc = IMX_SC_RPC_SVC_SECO;
+	msg.func = IMX_SC_SECO_FUNC_SECVIO_ENABLE;
+	msg.size = 1;
+
+	ret = imx_scu_call_rpc(ipc, &msg, true);
+	if (ret)
+		return ret;
+
+	return 0;
+}
+EXPORT_SYMBOL(imx_sc_seco_secvio_enable);
+
+struct imx_sc_msg_seco_config {
+	struct imx_sc_rpc_msg hdr;
+	union {
+		struct req_seco_config {
+			u32 data0;
+			u32 data1;
+			u32 data2;
+			u32 data3;
+			u32 data4;
+			u8 id;
+			u8 access;
+			u8 size;
+		} __packed __aligned(4) req;
+		struct resp_seco_config {
+			u32 data0;
+			u32 data1;
+			u32 data2;
+			u32 data3;
+			u32 data4;
+		} rsp;
+	} u;
+
+};
+
+/**
+ * imx_sc_seco_secvio_config() - Configure a set of SNVS registers for secure
+ * violation
+ *
+ * Some registers are extended by others registers, they configure the same
+ * kind of behavior, it constitutes a set
+ *
+ * @ipc: IPC handle
+ * @id: ID of the register, ie the offset of the first register of the set
+ * @access: Write (1) or Read (0) the registers
+ * @data0: Data for the first register
+ * @data1: Data for the second register
+ * @data2: Data for the third register
+ * @data3: Data for the fourth register
+ * @data4: Data for the fifth register
+ * @size: Number of register to configure
+ *
+ * @return Returns 0 for success and < 0 for errors
+ */
+int imx_sc_seco_secvio_config(struct imx_sc_ipc *ipc, u8 id, u8 access,
+			      u32 *data0, u32 *data1, u32 *data2, u32 *data3,
+			      u32 *data4, u8 size)
+{
+	struct imx_sc_msg_seco_config msg;
+	struct imx_sc_rpc_msg *hdr = &msg.hdr;
+	int ret;
+
+	hdr->ver = IMX_SC_RPC_VERSION;
+	hdr->svc = IMX_SC_RPC_SVC_SECO;
+	hdr->func = IMX_SC_SECO_FUNC_SECVIO_CONFIG;
+	hdr->size = 7;
+
+	/* Check the pointers on data are valid and set it if doing a write */
+	switch (size) {
+	case 5:
+		if (!data4)
+			return -EINVAL;
+		if (access)
+			msg.u.req.data4 = *data4;
+		fallthrough;
+	case 4:
+		if (!data3)
+			return -EINVAL;
+		if (access)
+			msg.u.req.data3 = *data3;
+		fallthrough;
+	case 3:
+		if (!data2)
+			return -EINVAL;
+		if (access)
+			msg.u.req.data2 = *data2;
+		fallthrough;
+	case 2:
+		if (!data1)
+			return -EINVAL;
+		if (access)
+			msg.u.req.data1 = *data1;
+		fallthrough;
+	case 1:
+		if (!data0)
+			return -EINVAL;
+		if (access)
+			msg.u.req.data0 = *data0;
+		break;
+	default:
+		return -EINVAL;
+	}
+
+	msg.u.req.id = id;
+	msg.u.req.access = access;
+	msg.u.req.size = size;
+
+	ret = imx_scu_call_rpc(ipc, &msg, true);
+	if (ret)
+		return ret;
+
+	/* Pointers already checked so we just copy the data if reading */
+	if (!access)
+		switch (size) {
+		case 5:
+			*data4 = msg.u.rsp.data4;
+			fallthrough;
+		case 4:
+			*data3 = msg.u.rsp.data3;
+			fallthrough;
+		case 3:
+			*data2 = msg.u.rsp.data2;
+			fallthrough;
+		case 2:
+			*data1 = msg.u.rsp.data1;
+			fallthrough;
+		case 1:
+			*data0 = msg.u.rsp.data0;
+		}
+
+	return 0;
+}
+EXPORT_SYMBOL(imx_sc_seco_secvio_config);
+
+struct imx_sc_msg_seco_dgo_config {
+	struct imx_sc_rpc_msg hdr;
+	union {
+		struct req_seco_dgo_config {
+			u32 data;
+			u8 id;
+			u8 access;
+		} __packed __aligned(4) req;
+		struct resp_seco_dgo_config {
+			u32 data;
+		} rsp;
+	} u;
+};
+
+/**
+ * imx_sc_seco_secvio_dgo_config() - Configure the DGO module
+ *
+ * @ipc: IPC handle
+ * @id: ID of the register, ie the offset of the register
+ * @access: Write (1) or Read (0) the registers
+ * @data: Data for the register
+ *
+ * @return Returns 0 for success and < 0 for errors
+ */
+int imx_sc_seco_secvio_dgo_config(struct imx_sc_ipc *ipc, u8 id, u8 access,
+				  u32 *data)
+{
+	struct imx_sc_msg_seco_dgo_config msg;
+	struct imx_sc_rpc_msg *hdr = &msg.hdr;
+	int ret;
+
+	hdr->ver = IMX_SC_RPC_VERSION;
+	hdr->svc = IMX_SC_RPC_SVC_SECO;
+	hdr->func = IMX_SC_SECO_FUNC_SECVIO_DGO_CONFIG;
+	hdr->size = 3;
+
+	if (!data)
+		return -EINVAL;
+	if (access)
+		msg.u.req.data = *data;
+
+	msg.u.req.access = access;
+	msg.u.req.id = id;
+
+	ret = imx_scu_call_rpc(ipc, &msg, true);
+	if (ret)
+		return ret;
+
+	if (!access && data)
+		*data = msg.u.rsp.data;
+
+	return 0;
+}
+EXPORT_SYMBOL(imx_sc_seco_secvio_dgo_config);
diff --git a/include/linux/firmware/imx/ipc.h b/include/linux/firmware/imx/ipc.h
index 89105743..6924359 100644
--- a/include/linux/firmware/imx/ipc.h
+++ b/include/linux/firmware/imx/ipc.h
@@ -25,6 +25,7 @@ enum imx_sc_rpc_svc {
 	IMX_SC_RPC_SVC_PAD = 6,
 	IMX_SC_RPC_SVC_MISC = 7,
 	IMX_SC_RPC_SVC_IRQ = 8,
+	IMX_SC_RPC_SVC_SECO = 9,
 };
 
 struct imx_sc_rpc_msg {
diff --git a/include/linux/firmware/imx/sci.h b/include/linux/firmware/imx/sci.h
index 22c7657..914dce1 100644
--- a/include/linux/firmware/imx/sci.h
+++ b/include/linux/firmware/imx/sci.h
@@ -15,6 +15,7 @@
 #include <linux/firmware/imx/svc/misc.h>
 #include <linux/firmware/imx/svc/pm.h>
 #include <linux/firmware/imx/svc/rm.h>
+#include <linux/firmware/imx/svc/seco.h>
 
 int imx_scu_enable_general_irq_channel(struct device *dev);
 int imx_scu_irq_register_notifier(struct notifier_block *nb);
diff --git a/include/linux/firmware/imx/svc/seco.h b/include/linux/firmware/imx/svc/seco.h
new file mode 100644
index 0000000..3bd5e74
--- /dev/null
+++ b/include/linux/firmware/imx/svc/seco.h
@@ -0,0 +1,73 @@
+/* SPDX-License-Identifier: GPL-2.0+ */
+/*
+ * Copyright 2020 NXP
+ *
+ * Header file containing the public API for the System Controller (SC)
+ * Security Controller (SECO) function.
+ *
+ * SECO_SVC (SVC) Security Controller Service
+ *
+ * Module for the Security Controller (SECO) service.
+ */
+
+#ifndef _SC_SECO_API_H
+#define _SC_SECO_API_H
+
+#include <linux/errno.h>
+#include <linux/firmware/imx/sci.h>
+
+/*
+ * This type is used to indicate RPC SECO function calls.
+ */
+enum imx_sc_seco_func {
+	IMX_SC_SECO_FUNC_UNKNOWN = 0,
+	IMX_SC_SECO_FUNC_BUILD_INFO = 16,
+	IMX_SC_SECO_FUNC_SECVIO_ENABLE = 25,
+	IMX_SC_SECO_FUNC_SECVIO_CONFIG = 26,
+	IMX_SC_SECO_FUNC_SECVIO_DGO_CONFIG = 27,
+};
+
+#if IS_ENABLED(CONFIG_IMX_SCU)
+int imx_sc_seco_build_info(struct imx_sc_ipc *ipc, uint32_t *version,
+			   uint32_t *commit);
+
+int imx_sc_seco_secvio_enable(struct imx_sc_ipc *ipc);
+
+int imx_sc_seco_secvio_config(struct imx_sc_ipc *ipc, u8 id, u8 access,
+			      u32 *data0, u32 *data1, u32 *data2, u32 *data3,
+			      u32 *data4, u8 size);
+
+int imx_sc_seco_secvio_dgo_config(struct imx_sc_ipc *ipc, u8 id, u8 access,
+				  u32 *data);
+
+#else /* IS_ENABLED(CONFIG_IMX_SCU) */
+static inline
+int imx_sc_seco_build_info(struct imx_sc_ipc *ipc, uint32_t *version,
+			   uint32_t *commit)
+{
+	return -EOPNOTSUPP;
+}
+
+static inline
+int imx_sc_seco_secvio_enable(struct imx_sc_ipc *ipc)
+{
+	return -EOPNOTSUPP;
+}
+
+static inline
+int imx_sc_seco_secvio_config(struct imx_sc_ipc *ipc, u8 id, u8 access,
+			      u32 *data0, u32 *data1, u32 *data2, u32 *data3,
+			      u32 *data4, u8 size)
+{
+	return -EOPNOTSUPP;
+}
+
+static inline
+int imx_sc_seco_secvio_dgo_config(struct imx_sc_ipc *ipc, u8 id, u8 access,
+				  u32 *data)
+{
+	return -EOPNOTSUPP;
+}
+#endif /* IS_ENABLED(CONFIG_IMX_SCU) */
+
+#endif /* _SC_SECO_API_H */
-- 
2.7.4

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