firmware: arm_scmi: imx: Support getting reset reason of MISC protocol

MISC protocol supports getting reset reason per Logical Machine or
System. Add the API for user to retrieve the information from System
Manager.

Signed-off-by: Peng Fan <peng.fan@nxp.com>
Reviewed-by: Daniel Baluta <daniel.baluta@nxp.com>
Link: https://patch.msgid.link/20260305-scmi-imx-reset-v1-1-18de78978ba9@nxp.com
Signed-off-by: Sudeep Holla <sudeep.holla@kernel.org>

2 files changed, 100 insertions, 0 deletions

diff --git a/drivers/firmware/arm_scmi/vendors/imx/imx-sm-misc.c b/drivers/firmware/arm_scmi/vendors/imx/imx-sm-misc.c
index 0ada753367ef..637973fb45e6 100644
--- a/drivers/firmware/arm_scmi/vendors/imx/imx-sm-misc.c
+++ b/drivers/firmware/arm_scmi/vendors/imx/imx-sm-misc.c
@@ -27,6 +27,7 @@ enum scmi_imx_misc_protocol_cmd {
 	SCMI_IMX_MISC_CTRL_GET	= 0x4,
 	SCMI_IMX_MISC_DISCOVER_BUILD_INFO = 0x6,
 	SCMI_IMX_MISC_CTRL_NOTIFY = 0x8,
+	SCMI_IMX_MISC_RESET_REASON_GET = 0xA,
 	SCMI_IMX_MISC_CFG_INFO_GET = 0xC,
 	SCMI_IMX_MISC_SYSLOG_GET = 0xD,
 	SCMI_IMX_MISC_BOARD_INFO = 0xE,
@@ -89,6 +90,37 @@ struct scmi_imx_misc_cfg_info_out {
 	u8 cfgname[MISC_MAX_CFGNAME];
 };
 
+struct scmi_imx_misc_reset_reason_in {
+#define MISC_REASON_FLAG_SYSTEM	BIT(0)
+	__le32 flags;
+};
+
+struct scmi_imx_misc_reset_reason_out {
+	/* Boot reason flags */
+#define MISC_BOOT_FLAG_VLD		BIT(31)
+#define MISC_BOOT_FLAG_ORG_VLD		BIT(28)
+#define MISC_BOOT_FLAG_ORIGIN		GENMASK(27, 24)
+#define MISC_BOOT_FLAG_O_SHIFT		24
+#define MISC_BOOT_FLAG_ERR_VLD		BIT(23)
+#define MISC_BOOT_FLAG_ERR_ID		GENMASK(22, 8)
+#define MISC_BOOT_FLAG_E_SHIFT		8
+#define MISC_BOOT_FLAG_REASON		GENMASK(7, 0)
+	__le32 b_flags;
+	/* Shutdown reason flags */
+#define MISC_SHUTDOWN_FLAG_VLD		BIT(31)
+#define MISC_SHUTDOWN_FLAG_EXT_LEN	GENMASK(30, 29)
+#define MISC_SHUTDOWN_FLAG_ORG_VLD	BIT(28)
+#define MISC_SHUTDOWN_FLAG_ORIGIN	GENMASK(27, 24)
+#define MISC_SHUTDOWN_FLAG_O_SHIFT	24
+#define MISC_SHUTDOWN_FLAG_ERR_VLD	BIT(23)
+#define MISC_SHUTDOWN_FLAG_ERR_ID	GENMASK(22, 8)
+#define MISC_SHUTDOWN_FLAG_E_SHIFT	8
+#define MISC_SHUTDOWN_FLAG_REASON	GENMASK(7, 0)
+	__le32 s_flags;
+	/* Array of extended info words */
+	__le32 extinfo[MISC_EXT_INFO_LEN_MAX];
+};
+
 struct scmi_imx_misc_syslog_in {
 	__le32 flags;
 	__le32 index;
@@ -452,11 +484,65 @@ static int scmi_imx_misc_syslog_get(const struct scmi_protocol_handle *ph, u16 *
 	return ph->hops->iter_response_run(iter);
 }
 
+static int scmi_imx_misc_reset_reason(const struct scmi_protocol_handle *ph, bool system,
+				      struct scmi_imx_misc_reset_reason *boot_r,
+				      struct scmi_imx_misc_reset_reason *shut_r,
+				      u32 *extinfo)
+{
+	struct scmi_imx_misc_reset_reason_in *in;
+	struct scmi_imx_misc_reset_reason_out *out;
+	struct scmi_xfer *t;
+	int ret;
+
+	ret = ph->xops->xfer_get_init(ph, SCMI_IMX_MISC_RESET_REASON_GET, sizeof(*in),
+				      sizeof(*out), &t);
+	if (ret)
+		return ret;
+
+	in = t->tx.buf;
+	if (system)
+		in->flags = le32_encode_bits(1, MISC_REASON_FLAG_SYSTEM);
+	else
+		in->flags = cpu_to_le32(0);
+
+	ret = ph->xops->do_xfer(ph, t);
+	if (!ret) {
+		out = t->rx.buf;
+		if (boot_r) {
+			boot_r->valid = le32_get_bits(out->b_flags, MISC_BOOT_FLAG_VLD);
+			boot_r->orig_valid = le32_get_bits(out->b_flags, MISC_BOOT_FLAG_ORG_VLD);
+			boot_r->err_valid = le32_get_bits(out->b_flags, MISC_BOOT_FLAG_ERR_VLD);
+			boot_r->reason = le32_get_bits(out->b_flags, MISC_BOOT_FLAG_REASON);
+			boot_r->origin = le32_get_bits(out->b_flags, MISC_BOOT_FLAG_ORIGIN);
+			boot_r->errid = le32_get_bits(out->b_flags, MISC_BOOT_FLAG_ERR_ID);
+		}
+
+		if (shut_r) {
+			shut_r->valid = le32_get_bits(out->s_flags, MISC_SHUTDOWN_FLAG_VLD);
+			shut_r->orig_valid = le32_get_bits(out->s_flags,
+							   MISC_SHUTDOWN_FLAG_ORG_VLD);
+			shut_r->err_valid = le32_get_bits(out->s_flags,
+							  MISC_SHUTDOWN_FLAG_ERR_VLD);
+			shut_r->reason = le32_get_bits(out->s_flags, MISC_SHUTDOWN_FLAG_REASON);
+			shut_r->origin = le32_get_bits(out->s_flags, MISC_SHUTDOWN_FLAG_ORIGIN);
+			shut_r->errid = le32_get_bits(out->s_flags, MISC_SHUTDOWN_FLAG_ERR_ID);
+		}
+
+		if (extinfo)
+			memcpy_from_le32(extinfo, out->extinfo, MISC_EXT_INFO_LEN_MAX);
+	}
+
+	ph->xops->xfer_put(ph, t);
+
+	return ret;
+}
+
 static const struct scmi_imx_misc_proto_ops scmi_imx_misc_proto_ops = {
 	.misc_ctrl_set = scmi_imx_misc_ctrl_set,
 	.misc_ctrl_get = scmi_imx_misc_ctrl_get,
 	.misc_ctrl_req_notify = scmi_imx_misc_ctrl_notify,
 	.misc_syslog = scmi_imx_misc_syslog_get,
+	.misc_reset_reason = scmi_imx_misc_reset_reason,
 };
 
 static int scmi_imx_misc_protocol_init(const struct scmi_protocol_handle *ph)
diff --git a/include/linux/scmi_imx_protocol.h b/include/linux/scmi_imx_protocol.h
index 2407d7693b6b..ab867463c08c 100644
--- a/include/linux/scmi_imx_protocol.h
+++ b/include/linux/scmi_imx_protocol.h
@@ -52,6 +52,17 @@ struct scmi_imx_misc_ctrl_notify_report {
 	unsigned int		flags;
 };
 
+
+#define MISC_EXT_INFO_LEN_MAX	4
+struct scmi_imx_misc_reset_reason {
+	bool valid:1;
+	bool orig_valid:1;
+	bool err_valid:1;
+	u32 reason;
+	u32 origin;
+	u32 errid;
+};
+
 struct scmi_imx_misc_proto_ops {
 	int (*misc_ctrl_set)(const struct scmi_protocol_handle *ph, u32 id,
 			     u32 num, u32 *val);
@@ -61,6 +72,9 @@ struct scmi_imx_misc_proto_ops {
 				    u32 ctrl_id, u32 evt_id, u32 flags);
 	int (*misc_syslog)(const struct scmi_protocol_handle *ph, u16 *size,
 			   void *array);
+	int (*misc_reset_reason)(const struct scmi_protocol_handle *ph,
+				 bool system, struct scmi_imx_misc_reset_reason *boot_r,
+				 struct scmi_imx_misc_reset_reason *shut_r, u32 *extinfo);
 };
 
 /* See LMM_ATTRIBUTES in imx95.rst */