@@ -22,3 +22,14 @@ config IMX_SCU
This driver manages the IPC interface between host CPU and the
SCU firmware running on M4.
+
+config IMX_SCMI_MISC_DRV
+ tristate "IMX SCMI MISC Protocol driver"
+ depends on IMX_SCMI_MISC_EXT || COMPILE_TEST
+ default y if ARCH_MXC
+ help
+ The System Controller Management Interface firmware (SCMI FW) is
+ a low-level system function which runs on a dedicated Cortex-M
+ core that could provide misc functions such as board control.
+
+ This driver can also be built as a module.
@@ -1,3 +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_SCMI_MISC_DRV} += sm-misc.o
new file mode 100644
@@ -0,0 +1,119 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Copyright 2024 NXP
+ */
+
+#include <linux/firmware/imx/sm.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/platform_device.h>
+#include <linux/scmi_protocol.h>
+#include <linux/scmi_imx_protocol.h>
+
+static const struct scmi_imx_misc_proto_ops *imx_misc_ctrl_ops;
+static struct scmi_protocol_handle *ph;
+struct notifier_block scmi_imx_misc_ctrl_nb;
+
+int scmi_imx_misc_ctrl_set(u32 id, u32 val)
+{
+ if (!ph)
+ return -EPROBE_DEFER;
+
+ return imx_misc_ctrl_ops->misc_ctrl_set(ph, id, 1, &val);
+};
+EXPORT_SYMBOL(scmi_imx_misc_ctrl_set);
+
+int scmi_imx_misc_ctrl_get(u32 id, u32 *num, u32 *val)
+{
+ if (!ph)
+ return -EPROBE_DEFER;
+
+ return imx_misc_ctrl_ops->misc_ctrl_get(ph, id, num, val);
+}
+EXPORT_SYMBOL(scmi_imx_misc_ctrl_get);
+
+static int scmi_imx_misc_ctrl_notifier(struct notifier_block *nb,
+ unsigned long event, void *data)
+{
+ /*
+ * notifier_chain_register requires a valid notifier_block and
+ * valid notifier_call. SCMI_EVENT_IMX_MISC_CONTROL is needed
+ * to let SCMI firmware enable control events, but the hook here
+ * is just a dummy function to avoid kernel panic as of now.
+ */
+ return 0;
+}
+
+static int scmi_imx_misc_ctrl_probe(struct scmi_device *sdev)
+{
+ const struct scmi_handle *handle = sdev->handle;
+ struct device_node *np = sdev->dev.of_node;
+ u32 src_id, flags;
+ int ret, i, num;
+
+ if (!handle)
+ return -ENODEV;
+
+ if (imx_misc_ctrl_ops) {
+ dev_err(&sdev->dev, "misc ctrl already initialized\n");
+ return -EEXIST;
+ }
+
+ imx_misc_ctrl_ops = handle->devm_protocol_get(sdev, SCMI_PROTOCOL_IMX_MISC, &ph);
+ if (IS_ERR(imx_misc_ctrl_ops))
+ return PTR_ERR(imx_misc_ctrl_ops);
+
+ num = of_property_count_u32_elems(np, "nxp,ctrl-ids");
+ if (num % 2) {
+ dev_err(&sdev->dev, "Invalid wakeup-sources\n");
+ return -EINVAL;
+ }
+
+ scmi_imx_misc_ctrl_nb.notifier_call = &scmi_imx_misc_ctrl_notifier;
+ for (i = 0; i < num; i += 2) {
+ ret = of_property_read_u32_index(np, "nxp,ctrl-ids", i, &src_id);
+ if (ret) {
+ dev_err(&sdev->dev, "Failed to read ctrl-id: %i\n", i);
+ continue;
+ }
+
+ ret = of_property_read_u32_index(np, "nxp,ctrl-ids", i + 1, &flags);
+ if (ret) {
+ dev_err(&sdev->dev, "Failed to read ctrl-id value: %d\n", i + 1);
+ continue;
+ }
+
+ ret = handle->notify_ops->devm_event_notifier_register(sdev, SCMI_PROTOCOL_IMX_MISC,
+ SCMI_EVENT_IMX_MISC_CONTROL,
+ &src_id,
+ &scmi_imx_misc_ctrl_nb);
+ if (ret)
+ dev_err(&sdev->dev, "Failed to register scmi misc event: %d\n", src_id);
+ else {
+ ret = imx_misc_ctrl_ops->misc_ctrl_req_notify(ph, src_id,
+ SCMI_EVENT_IMX_MISC_CONTROL,
+ flags);
+ if (ret)
+ dev_err(&sdev->dev, "Failed to req notify: %d\n", src_id);
+ }
+ }
+
+ return 0;
+}
+
+static const struct scmi_device_id scmi_id_table[] = {
+ { SCMI_PROTOCOL_IMX_MISC, "imx-misc-ctrl" },
+ { },
+};
+MODULE_DEVICE_TABLE(scmi, scmi_id_table);
+
+static struct scmi_driver scmi_imx_misc_ctrl_driver = {
+ .name = "scmi-imx-misc-ctrl",
+ .probe = scmi_imx_misc_ctrl_probe,
+ .id_table = scmi_id_table,
+};
+module_scmi_driver(scmi_imx_misc_ctrl_driver);
+
+MODULE_AUTHOR("Peng Fan <peng.fan@nxp.com>");
+MODULE_DESCRIPTION("IMX SM MISC driver");
+MODULE_LICENSE("GPL");
new file mode 100644
@@ -0,0 +1,33 @@
+/* SPDX-License-Identifier: GPL-2.0+ */
+/*
+ * Copyright 2024 NXP
+ */
+
+#ifndef _SCMI_IMX_H
+#define _SCMI_IMX_H
+
+#include <linux/bitfield.h>
+#include <linux/types.h>
+
+#define SCMI_IMX_CTRL_PDM_CLK_SEL 0 /* AON PDM clock sel */
+#define SCMI_IMX_CTRL_MQS1_SETTINGS 1 /* AON MQS settings */
+#define SCMI_IMX_CTRL_SAI1_MCLK 2 /* AON SAI1 MCLK */
+#define SCMI_IMX_CTRL_SAI3_MCLK 3 /* WAKE SAI3 MCLK */
+#define SCMI_IMX_CTRL_SAI4_MCLK 4 /* WAKE SAI4 MCLK */
+#define SCMI_IMX_CTRL_SAI5_MCLK 5 /* WAKE SAI5 MCLK */
+
+#if IS_ENABLED(CONFIG_IMX_SCMI_MISC_EXT)
+int scmi_imx_misc_ctrl_get(u32 id, u32 *num, u32 *val);
+int scmi_imx_misc_ctrl_set(u32 id, u32 val);
+#else
+static inline int scmi_imx_misc_ctrl_get(u32 id, u32 *num, u32 *val)
+{
+ return -EOPNOTSUPP;
+}
+
+static inline int scmi_imx_misc_ctrl_set(u32 id, u32 val);
+{
+ return -EOPNOTSUPP;
+}
+#endif
+#endif