firmware: imx: Add i.MX95 MISC driver

The i.MX95 System manager exports SCMI MISC protocol for linux to do
various settings, such as set board gpio expander as wakeup source.

The driver is to add the support.

Reviewed-by: Cristian Marussi <cristian.marussi@arm.com>
Signed-off-by: Peng Fan <peng.fan@nxp.com>
Message-Id: <20240823-imx95-bbm-misc-v2-v8-5-e600ed9e9271@nxp.com>
Signed-off-by: Sudeep Holla <sudeep.holla@arm.com>

3 files changed, 131 insertions, 0 deletions

diff --git a/drivers/firmware/imx/Kconfig b/drivers/firmware/imx/Kconfig
index 183613f82a11..477d3f32d99a 100644
--- a/drivers/firmware/imx/Kconfig
+++ b/drivers/firmware/imx/Kconfig
@@ -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.
diff --git a/drivers/firmware/imx/Makefile b/drivers/firmware/imx/Makefile
index 8f9f04a513a8..8d046c341be8 100644
--- a/drivers/firmware/imx/Makefile
+++ b/drivers/firmware/imx/Makefile
@@ -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
diff --git a/drivers/firmware/imx/sm-misc.c b/drivers/firmware/imx/sm-misc.c
new file mode 100644
index 000000000000..fc3ee12c2be8
--- /dev/null
+++ b/drivers/firmware/imx/sm-misc.c
@@ -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");