[PATCH v3 03/12] imx95: Add get_reset_reason() to retrieve the LM/system last booted/shutdown reasons
Alice Guo (OSS)
alice.guo at oss.nxp.com
Tue Sep 23 04:14:55 CEST 2025
From: Peng Fan <peng.fan at nxp.com>
System Manager provides the last booted and shutdown reasons of the
logical machines (LM) and system using the SCMI misc protocol (Protocol
ID: 0x84, Message ID: 0xA). This path adds get_reset_reason() to query
and print these reasons in SPL and U-Boot.
Signed-off-by: Peng Fan <peng.fan at nxp.com>
Signed-off-by: Alice Guo <alice.guo at nxp.com>
Reviewed-by: Ye Li <ye.li at nxp.com>
---
arch/arm/include/asm/arch-imx9/sys_proto.h | 1 +
arch/arm/mach-imx/imx9/scmi/soc.c | 110 +++++++++++++++++++++++++++++
board/freescale/imx95_evk/spl.c | 3 +
include/scmi_nxp_protocols.h | 55 +++++++++++++++
4 files changed, 169 insertions(+)
diff --git a/arch/arm/include/asm/arch-imx9/sys_proto.h b/arch/arm/include/asm/arch-imx9/sys_proto.h
index 455aa95339e..dead7a99a66 100644
--- a/arch/arm/include/asm/arch-imx9/sys_proto.h
+++ b/arch/arm/include/asm/arch-imx9/sys_proto.h
@@ -21,6 +21,7 @@ int m33_prepare(void);
int low_drive_freq_update(void *blob);
enum imx9_soc_voltage_mode soc_target_voltage_mode(void);
+int get_reset_reason(bool sys, bool lm);
#define is_voltage_mode(mode) (soc_target_voltage_mode() == (mode))
diff --git a/arch/arm/mach-imx/imx9/scmi/soc.c b/arch/arm/mach-imx/imx9/scmi/soc.c
index f973652d0cb..f04b9255cdb 100644
--- a/arch/arm/mach-imx/imx9/scmi/soc.c
+++ b/arch/arm/mach-imx/imx9/scmi/soc.c
@@ -17,8 +17,10 @@
#include <env_internal.h>
#include <fuse.h>
#include <imx_thermal.h>
+#include <linux/bitfield.h>
#include <linux/iopoll.h>
#include <scmi_agent.h>
+#include <scmi_nxp_protocols.h>
DECLARE_GLOBAL_DATA_PTR;
@@ -468,6 +470,114 @@ err:
printf("%s: fuse read err: %d\n", __func__, ret);
}
+static char *rst_string[32] = {
+ "cm33_lockup",
+ "cm33_swreq",
+ "cm7_lockup",
+ "cm7_swreq",
+ "fccu",
+ "jtag_sw",
+ "ele",
+ "tempsense",
+ "wdog1",
+ "wdog2",
+ "wdog3",
+ "wdog4",
+ "wdog5",
+ "jtag",
+ "cm33_exc",
+ "bbm",
+ "sw",
+ "sm_err", "fusa_sreco", "pmic", "unused", "unused", "unused",
+ "unused", "unused", "unused", "unused", "unused", "unused",
+ "unused", "unused",
+ "por"
+};
+
+int get_reset_reason(bool sys, bool lm)
+{
+ struct scmi_imx_misc_reset_reason_in in = {
+ .flags = MISC_REASON_FLAG_SYSTEM,
+ };
+
+ struct scmi_imx_misc_reset_reason_out out = { 0 };
+ struct scmi_msg msg = {
+ .protocol_id = SCMI_PROTOCOL_ID_IMX_MISC,
+ .message_id = SCMI_IMX_MISC_RESET_REASON,
+ .in_msg = (u8 *)&in,
+ .in_msg_sz = sizeof(in),
+ .out_msg = (u8 *)&out,
+ .out_msg_sz = sizeof(out),
+ };
+ int ret;
+
+ struct udevice *dev;
+
+ ret = uclass_get_device_by_name(UCLASS_CLK, "protocol at 14", &dev);
+ if (ret)
+ return ret;
+
+ if (sys) {
+ ret = devm_scmi_process_msg(dev, &msg);
+ if (out.status) {
+ printf("%s:%d for SYS\n", __func__, out.status);
+ return ret;
+ }
+
+ if (out.bootflags & MISC_BOOT_FLAG_VLD) {
+ printf("SYS Boot reason: %s, origin: %ld, errid: %ld\n",
+ rst_string[out.bootflags & MISC_BOOT_FLAG_REASON],
+ out.bootflags & MISC_BOOT_FLAG_ORG_VLD ?
+ FIELD_GET(MISC_BOOT_FLAG_ORIGIN, out.bootflags) : -1,
+ out.bootflags & MISC_BOOT_FLAG_ERR_VLD ?
+ FIELD_GET(MISC_BOOT_FLAG_ERR_ID, out.bootflags) : -1
+ );
+ }
+ if (out.shutdownflags & MISC_SHUTDOWN_FLAG_VLD) {
+ printf("SYS shutdown reason: %s, origin: %ld, errid: %ld\n",
+ rst_string[out.bootflags & MISC_SHUTDOWN_FLAG_REASON],
+ out.bootflags & MISC_SHUTDOWN_FLAG_ORG_VLD ?
+ FIELD_GET(MISC_SHUTDOWN_FLAG_ORIGIN, out.bootflags) : -1,
+ out.bootflags & MISC_SHUTDOWN_FLAG_ERR_VLD ?
+ FIELD_GET(MISC_SHUTDOWN_FLAG_ERR_ID, out.bootflags) : -1
+ );
+ }
+ }
+
+ if (lm) {
+ in.flags = 0;
+ memset(&out, 0, sizeof(struct scmi_imx_misc_reset_reason_out));
+
+ ret = devm_scmi_process_msg(dev, &msg);
+ if (out.status) {
+ printf("%s:%d for LM\n", __func__, out.status);
+ return ret;
+ }
+
+ if (out.bootflags & MISC_BOOT_FLAG_VLD) {
+ printf("LM Boot reason: %s, origin: %ld, errid: %ld\n",
+ rst_string[out.bootflags & MISC_BOOT_FLAG_REASON],
+ out.bootflags & MISC_BOOT_FLAG_ORG_VLD ?
+ FIELD_GET(MISC_BOOT_FLAG_ORIGIN, out.bootflags) : -1,
+ out.bootflags & MISC_BOOT_FLAG_ERR_VLD ?
+ FIELD_GET(MISC_BOOT_FLAG_ERR_ID, out.bootflags) : -1
+ );
+ }
+
+ if (out.shutdownflags & MISC_SHUTDOWN_FLAG_VLD) {
+ printf("LM shutdown reason: %s, origin: %ld, errid: %ld\n",
+ rst_string[out.bootflags & MISC_SHUTDOWN_FLAG_REASON],
+ out.bootflags & MISC_SHUTDOWN_FLAG_ORG_VLD ?
+ FIELD_GET(MISC_SHUTDOWN_FLAG_ORIGIN, out.bootflags) : -1,
+ out.bootflags & MISC_SHUTDOWN_FLAG_ERR_VLD ?
+ FIELD_GET(MISC_SHUTDOWN_FLAG_ERR_ID, out.bootflags) : -1
+ );
+ }
+ }
+
+ return 0;
+}
+
const char *get_imx_type(u32 imxtype)
{
switch (imxtype) {
diff --git a/board/freescale/imx95_evk/spl.c b/board/freescale/imx95_evk/spl.c
index 08f4da0bb73..3d64097b4c7 100644
--- a/board/freescale/imx95_evk/spl.c
+++ b/board/freescale/imx95_evk/spl.c
@@ -5,6 +5,7 @@
#include <asm/arch/clock.h>
#include <asm/arch/mu.h>
+#include <asm/arch/sys_proto.h>
#include <asm/mach-imx/boot_mode.h>
#include <asm/sections.h>
#include <hang.h>
@@ -65,5 +66,7 @@ void board_init_f(ulong dummy)
debug("SOC: 0x%x\n", gd->arch.soc_rev);
debug("LC: 0x%x\n", gd->arch.lifecycle);
+ get_reset_reason(true, false);
+
board_init_r(NULL, 0);
}
diff --git a/include/scmi_nxp_protocols.h b/include/scmi_nxp_protocols.h
new file mode 100644
index 00000000000..fe6ecd6a7cf
--- /dev/null
+++ b/include/scmi_nxp_protocols.h
@@ -0,0 +1,55 @@
+/* SPDX-License-Identifier: GPL-2.0 OR BSD-3-Clause */
+/*
+ * Copyright 2025 NXP
+ */
+
+#ifndef _SCMI_NXP_PROTOCOLS_H
+#define _SCMI_NXP_PROTOCOLS_H
+
+#include <asm/types.h>
+#include <linux/bitops.h>
+
+enum scmi_imx_protocol {
+ SCMI_IMX_PROTOCOL_ID_MISC = 0x84,
+};
+
+#define SCMI_PAYLOAD_LEN 100
+
+#define SCMI_ARRAY(X, Y) ((SCMI_PAYLOAD_LEN - (X)) / sizeof(Y))
+
+#define SCMI_IMX_MISC_RESET_REASON 0xA
+
+struct scmi_imx_misc_reset_reason_in {
+#define MISC_REASON_FLAG_SYSTEM BIT(0)
+ u32 flags;
+};
+
+struct scmi_imx_misc_reset_reason_out {
+ s32 status;
+ /* 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)
+ u32 bootflags;
+ /* 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)
+ u32 shutdownflags;
+ /* Array of extended info words */
+#define MISC_MAX_EXTINFO SCMI_ARRAY(16, u32)
+ u32 extInfo[MISC_MAX_EXTINFO];
+};
+
+#endif
--
2.43.0
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