[PATCH 5/7] firmware: arm_scmi: imx: Support getting syslog of MISC protocol

Peng Fan
2025-06-27T06:06:03Z

MISC protocol supports getting system log regarding system sleep latency
,wakeup interrupt and etc. Add the API for user to retrieve the
information from SM.

Signed-off-by: Peng Fan <peng.fan@nxp.com>
---
.../firmware/arm_scmi/vendors/imx/imx-sm-misc.c | 78 ++++++++++++++++++++++
include/linux/scmi_imx_protocol.h | 19 ++++++
2 files changed, 97 insertions(+)

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 d5b24bc4d4ca6c19f4cddfaea6e9d9b32a4c92f7..1a6d75357b76ce6bb7d06461999b368c27f1fa43 100644
--- a/drivers/firmware/arm_scmi/vendors/imx/imx-sm-misc.c
+++ b/drivers/firmware/arm_scmi/vendors/imx/imx-sm-misc.c
@@ -28,6 +28,7 @@ enum scmi_imx_misc_protocol_cmd {
SCMI_IMX_MISC_DISCOVER_BUILDINFO = 0x6,
SCMI_IMX_MISC_SI_INFO = 0xB,
SCMI_IMX_MISC_CFG_INFO = 0xC,
+ SCMI_IMX_MISC_SYSLOG = 0xD,
SCMI_IMX_MISC_CTRL_NOTIFY = 0x8,
};

@@ -87,6 +88,19 @@ struct scmi_imx_misc_si_info_out {
u8 siname[MISC_MAX_SINAME];
};

+struct scmi_imx_misc_syslog_in {
+ __le32 flags;
+ __le32 index;
+};
+
+#define REMAINING(x) le32_get_bits((x), GENMASK(31, 20))
+#define RETURNED(x) le32_get_bits((x), GENMASK(11, 0))
+
+struct scmi_imx_misc_syslog_out {
+ __le32 numlogflags;
+ __le32 syslog[];
+};
+
static int scmi_imx_misc_attributes_get(const struct scmi_protocol_handle *ph,
struct scmi_imx_misc_info *mi)
{
@@ -368,6 +382,69 @@ static int scmi_imx_misc_silicon_info(const struct scmi_protocol_handle *ph,
return ret;
}

+struct scmi_imx_misc_syslog_ipriv {
+ u32 *array;
+};
+
+static void iter_misc_syslog_prepare_message(void *message, u32 desc_index,
+ const void *priv)
+{
+ struct scmi_imx_misc_syslog_in *msg = message;
+
+ msg->flags = cpu_to_le32(0);
+ msg->index = cpu_to_le32(desc_index);
+}
+
+static int iter_misc_syslog_update_state(struct scmi_iterator_state *st,
+ const void *response, void *priv)
+{
+ const struct scmi_imx_misc_syslog_out *r = response;
+
+ st->num_returned = RETURNED(r->numlogflags);
+ st->num_remaining = REMAINING(r->numlogflags);
+
+ return 0;
+}
+
+static int
+iter_misc_syslog_process_response(const struct scmi_protocol_handle *ph,
+ const void *response,
+ struct scmi_iterator_state *st, void *priv)
+{
+ const struct scmi_imx_misc_syslog_out *r = response;
+ struct scmi_imx_misc_syslog_ipriv *p = priv;
+
+ p->array[st->desc_index + st->loop_idx] =
+ le32_to_cpu(r->syslog[st->loop_idx]);
+
+ return 0;
+}
+
+static int scmi_imx_misc_syslog(const struct scmi_protocol_handle *ph, u16 size,
+ void *array)
+{
+ struct scmi_iterator_ops ops = {
+ .prepare_message = iter_misc_syslog_prepare_message,
+ .update_state = iter_misc_syslog_update_state,
+ .process_response = iter_misc_syslog_process_response,
+ };
+ struct scmi_imx_misc_syslog_ipriv ipriv = {
+ .array = array,
+ };
+ void *iter;
+
+ if (!array || !size)
+ return -EINVAL;
+
+ iter = ph->hops->iter_response_init(ph, &ops, size, SCMI_IMX_MISC_SYSLOG,
+ sizeof(struct scmi_imx_misc_syslog_in),
+ &ipriv);
+ if (IS_ERR(iter))
+ return PTR_ERR(iter);
+
+ return ph->hops->iter_response_run(iter);
+}
+
static const struct scmi_imx_misc_proto_ops scmi_imx_misc_proto_ops = {
.misc_cfg_info = scmi_imx_misc_cfg_info,
.misc_ctrl_set = scmi_imx_misc_ctrl_set,
@@ -375,6 +452,7 @@ static const struct scmi_imx_misc_proto_ops scmi_imx_misc_proto_ops = {
.misc_ctrl_req_notify = scmi_imx_misc_ctrl_notify,
.misc_discover_build_info = scmi_imx_discover_build_info,
.misc_silicon_info = scmi_imx_misc_silicon_info,
+ .misc_syslog = scmi_imx_misc_syslog,
};

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 0e639dfb5d16e281e2ccf006a63694b316c431f4..ff34d974046aa982fa9f5d46fc673412e01a532d 100644
--- a/include/linux/scmi_imx_protocol.h
+++ b/include/linux/scmi_imx_protocol.h
@@ -71,6 +71,23 @@ struct scmi_imx_misc_system_info {
u8 siname[MISC_MAX_SINAME];
};

+struct scmi_imx_misc_sys_sleep_rec {
+ u32 sleepentryusec;
+ u32 sleepexitusec;
+ u32 sleepcnt;
+ u32 wakesource;
+ u32 mixpwrstat;
+ u32 mempwrstat;
+ u32 pllpwrstat;
+ u32 syssleepmode;
+ u32 syssleepflags;
+};
+
+struct scmi_imx_misc_syslog {
+ struct scmi_imx_misc_sys_sleep_rec syssleeprecord;
+ uint32_t deverrlog;
+};
+
struct scmi_imx_misc_proto_ops {
int (*misc_cfg_info)(const struct scmi_protocol_handle *ph,
struct scmi_imx_misc_system_info *info);
@@ -84,6 +101,8 @@ struct scmi_imx_misc_proto_ops {
struct scmi_imx_misc_system_info *info);
int (*misc_silicon_info)(const struct scmi_protocol_handle *ph,
struct scmi_imx_misc_system_info *info);
+ int (*misc_syslog)(const struct scmi_protocol_handle *ph, u16 size,
+ void *array);
};

/* See LMM_ATTRIBUTES in imx95.rst */

--
2.37.1