firmware: arm_scmi: Add initial support for i.MX MISC protocol

i.MX95 System Manager(SM) firmware includes a SCMI vendor protocol, SCMI
MISC protocol which includes controls that are misc settings/actions that
must be exposed from the SM to agents. They are device specific and are
usually define to access bit fields in various mix block control modules,
IOMUX_GPR, and other General Purpose registers, Control Status Registers
owned by the SM.

Reviewed-by: Cristian Marussi <cristian.marussi@arm.com>
Signed-off-by: Peng Fan <peng.fan@nxp.com>
Message-Id: <20240823-imx95-bbm-misc-v2-v8-3-e600ed9e9271@nxp.com>
Signed-off-by: Sudeep Holla <sudeep.holla@arm.com>

drivers/firmware/arm_scmi/vendors/imx/Kconfig

@@ -12,4 +12,14 @@ config IMX_SCMI_BBM_EXT
 	  To compile this driver as a module, choose M here: the
 	  module will be called imx-sm-bbm.
 
+config IMX_SCMI_MISC_EXT
+	tristate "i.MX SCMI MISC EXTENSION"
+	depends on ARM_SCMI_PROTOCOL || (COMPILE_TEST && OF)
+	default y if ARCH_MXC
+	help
+	  This enables i.MX System MISC control logic such as gpio expander
+	  wakeup
+
+	  To compile this driver as a module, choose M here: the
+	  module will be called imx-sm-misc.
 endmenu

drivers/firmware/arm_scmi/vendors/imx/Makefile

@@ -1,2 +1,3 @@
 # SPDX-License-Identifier: GPL-2.0-only
 obj-$(CONFIG_IMX_SCMI_BBM_EXT) += imx-sm-bbm.o
+obj-$(CONFIG_IMX_SCMI_MISC_EXT) += imx-sm-misc.o

drivers/firmware/arm_scmi/vendors/imx/imx-sm-misc.c

@@ -0,0 +1,318 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * System control and Management Interface (SCMI) NXP MISC Protocol
+ *
+ * Copyright 2024 NXP
+ */
+
+#define pr_fmt(fmt) "SCMI Notifications MISC - " fmt
+
+#include <linux/bits.h>
+#include <linux/io.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>
+
+#include "../../protocols.h"
+#include "../../notify.h"
+
+#define SCMI_PROTOCOL_SUPPORTED_VERSION		0x10000
+
+#define MAX_MISC_CTRL_SOURCES			GENMASK(15, 0)
+
+enum scmi_imx_misc_protocol_cmd {
+	SCMI_IMX_MISC_CTRL_SET	= 0x3,
+	SCMI_IMX_MISC_CTRL_GET	= 0x4,
+	SCMI_IMX_MISC_CTRL_NOTIFY = 0x8,
+};
+
+struct scmi_imx_misc_info {
+	u32 version;
+	u32 nr_dev_ctrl;
+	u32 nr_brd_ctrl;
+	u32 nr_reason;
+};
+
+struct scmi_msg_imx_misc_protocol_attributes {
+	__le32 attributes;
+};
+
+#define GET_BRD_CTRLS_NR(x)	le32_get_bits((x), GENMASK(31, 24))
+#define GET_REASONS_NR(x)	le32_get_bits((x), GENMASK(23, 16))
+#define GET_DEV_CTRLS_NR(x)	le32_get_bits((x), GENMASK(15, 0))
+#define BRD_CTRL_START_ID	BIT(15)
+
+struct scmi_imx_misc_ctrl_set_in {
+	__le32 id;
+	__le32 num;
+	__le32 value[];
+};
+
+struct scmi_imx_misc_ctrl_notify_in {
+	__le32 ctrl_id;
+	__le32 flags;
+};
+
+struct scmi_imx_misc_ctrl_notify_payld {
+	__le32 ctrl_id;
+	__le32 flags;
+};
+
+struct scmi_imx_misc_ctrl_get_out {
+	__le32 num;
+	__le32 val[];
+};
+
+static int scmi_imx_misc_attributes_get(const struct scmi_protocol_handle *ph,
+					struct scmi_imx_misc_info *mi)
+{
+	int ret;
+	struct scmi_xfer *t;
+	struct scmi_msg_imx_misc_protocol_attributes *attr;
+
+	ret = ph->xops->xfer_get_init(ph, PROTOCOL_ATTRIBUTES, 0,
+				      sizeof(*attr), &t);
+	if (ret)
+		return ret;
+
+	attr = t->rx.buf;
+
+	ret = ph->xops->do_xfer(ph, t);
+	if (!ret) {
+		mi->nr_dev_ctrl = GET_DEV_CTRLS_NR(attr->attributes);
+		mi->nr_brd_ctrl = GET_BRD_CTRLS_NR(attr->attributes);
+		mi->nr_reason = GET_REASONS_NR(attr->attributes);
+		dev_info(ph->dev, "i.MX MISC NUM DEV CTRL: %d, NUM BRD CTRL: %d,NUM Reason: %d\n",
+			 mi->nr_dev_ctrl, mi->nr_brd_ctrl, mi->nr_reason);
+	}
+
+	ph->xops->xfer_put(ph, t);
+
+	return ret;
+}
+
+static int scmi_imx_misc_ctrl_validate_id(const struct scmi_protocol_handle *ph,
+					  u32 ctrl_id)
+{
+	struct scmi_imx_misc_info *mi = ph->get_priv(ph);
+
+	/*
+	 * [0,      BRD_CTRL_START_ID) is for Dev Ctrl which is SOC related
+	 * [BRD_CTRL_START_ID, 0xffff) is for Board Ctrl which is board related
+	 */
+	if (ctrl_id < BRD_CTRL_START_ID && ctrl_id > mi->nr_dev_ctrl)
+		return -EINVAL;
+	if (ctrl_id >= BRD_CTRL_START_ID + mi->nr_brd_ctrl)
+		return -EINVAL;
+
+	return 0;
+}
+
+static int scmi_imx_misc_ctrl_notify(const struct scmi_protocol_handle *ph,
+				     u32 ctrl_id, u32 evt_id, u32 flags)
+{
+	struct scmi_imx_misc_ctrl_notify_in *in;
+	struct scmi_xfer *t;
+	int ret;
+
+	ret = scmi_imx_misc_ctrl_validate_id(ph, ctrl_id);
+	if (ret)
+		return ret;
+
+	ret = ph->xops->xfer_get_init(ph, SCMI_IMX_MISC_CTRL_NOTIFY,
+				      sizeof(*in), 0, &t);
+	if (ret)
+		return ret;
+
+	in = t->tx.buf;
+	in->ctrl_id = cpu_to_le32(ctrl_id);
+	in->flags = cpu_to_le32(flags);
+
+	ret = ph->xops->do_xfer(ph, t);
+
+	ph->xops->xfer_put(ph, t);
+
+	return ret;
+}
+
+static int
+scmi_imx_misc_ctrl_set_notify_enabled(const struct scmi_protocol_handle *ph,
+				      u8 evt_id, u32 src_id, bool enable)
+{
+	int ret;
+
+	/* misc_ctrl_req_notify is for enablement */
+	if (enable)
+		return 0;
+
+	ret = scmi_imx_misc_ctrl_notify(ph, src_id, evt_id, 0);
+	if (ret)
+		dev_err(ph->dev, "FAIL_ENABLED - evt[%X] src[%d] - ret:%d\n",
+			evt_id, src_id, ret);
+
+	return ret;
+}
+
+static void *
+scmi_imx_misc_ctrl_fill_custom_report(const struct scmi_protocol_handle *ph,
+				      u8 evt_id, ktime_t timestamp,
+				      const void *payld, size_t payld_sz,
+				      void *report, u32 *src_id)
+{
+	const struct scmi_imx_misc_ctrl_notify_payld *p = payld;
+	struct scmi_imx_misc_ctrl_notify_report *r = report;
+
+	if (sizeof(*p) != payld_sz)
+		return NULL;
+
+	r->timestamp = timestamp;
+	r->ctrl_id = le32_to_cpu(p->ctrl_id);
+	r->flags = le32_to_cpu(p->flags);
+	if (src_id)
+		*src_id = r->ctrl_id;
+	dev_dbg(ph->dev, "%s: ctrl_id: %d flags: %d\n", __func__,
+		r->ctrl_id, r->flags);
+
+	return r;
+}
+
+static const struct scmi_event_ops scmi_imx_misc_event_ops = {
+	.set_notify_enabled = scmi_imx_misc_ctrl_set_notify_enabled,
+	.fill_custom_report = scmi_imx_misc_ctrl_fill_custom_report,
+};
+
+static const struct scmi_event scmi_imx_misc_events[] = {
+	{
+		.id = SCMI_EVENT_IMX_MISC_CONTROL,
+		.max_payld_sz = sizeof(struct scmi_imx_misc_ctrl_notify_payld),
+		.max_report_sz = sizeof(struct scmi_imx_misc_ctrl_notify_report),
+	},
+};
+
+static struct scmi_protocol_events scmi_imx_misc_protocol_events = {
+	.queue_sz = SCMI_PROTO_QUEUE_SZ,
+	.ops = &scmi_imx_misc_event_ops,
+	.evts = scmi_imx_misc_events,
+	.num_events = ARRAY_SIZE(scmi_imx_misc_events),
+	.num_sources = MAX_MISC_CTRL_SOURCES,
+};
+
+static int scmi_imx_misc_ctrl_get(const struct scmi_protocol_handle *ph,
+				  u32 ctrl_id, u32 *num, u32 *val)
+{
+	struct scmi_imx_misc_ctrl_get_out *out;
+	struct scmi_xfer *t;
+	int ret, i;
+	int max_msg_size = ph->hops->get_max_msg_size(ph);
+	int max_num = (max_msg_size - sizeof(*out)) / sizeof(__le32);
+
+	ret = scmi_imx_misc_ctrl_validate_id(ph, ctrl_id);
+	if (ret)
+		return ret;
+
+	ret = ph->xops->xfer_get_init(ph, SCMI_IMX_MISC_CTRL_GET, sizeof(u32),
+				      0, &t);
+	if (ret)
+		return ret;
+
+	put_unaligned_le32(ctrl_id, t->tx.buf);
+	ret = ph->xops->do_xfer(ph, t);
+	if (!ret) {
+		out = t->rx.buf;
+		*num = le32_to_cpu(out->num);
+
+		if (*num >= max_num ||
+		    *num * sizeof(__le32) > t->rx.len - sizeof(__le32)) {
+			ph->xops->xfer_put(ph, t);
+			return -EINVAL;
+		}
+
+		for (i = 0; i < *num; i++)
+			val[i] = le32_to_cpu(out->val[i]);
+	}
+
+	ph->xops->xfer_put(ph, t);
+
+	return ret;
+}
+
+static int scmi_imx_misc_ctrl_set(const struct scmi_protocol_handle *ph,
+				  u32 ctrl_id, u32 num, u32 *val)
+{
+	struct scmi_imx_misc_ctrl_set_in *in;
+	struct scmi_xfer *t;
+	int ret, i;
+	int max_msg_size = ph->hops->get_max_msg_size(ph);
+	int max_num = (max_msg_size - sizeof(*in)) / sizeof(__le32);
+
+	ret = scmi_imx_misc_ctrl_validate_id(ph, ctrl_id);
+	if (ret)
+		return ret;
+
+	if (num > max_num)
+		return -EINVAL;
+
+	ret = ph->xops->xfer_get_init(ph, SCMI_IMX_MISC_CTRL_SET, sizeof(*in),
+				      0, &t);
+	if (ret)
+		return ret;
+
+	in = t->tx.buf;
+	in->id = cpu_to_le32(ctrl_id);
+	in->num = cpu_to_le32(num);
+	for (i = 0; i < num; i++)
+		in->value[i] = cpu_to_le32(val[i]);
+
+	ret = ph->xops->do_xfer(ph, t);
+
+	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,
+};
+
+static int scmi_imx_misc_protocol_init(const struct scmi_protocol_handle *ph)
+{
+	struct scmi_imx_misc_info *minfo;
+	u32 version;
+	int ret;
+
+	ret = ph->xops->version_get(ph, &version);
+	if (ret)
+		return ret;
+
+	dev_info(ph->dev, "NXP SM MISC Version %d.%d\n",
+		 PROTOCOL_REV_MAJOR(version), PROTOCOL_REV_MINOR(version));
+
+	minfo = devm_kzalloc(ph->dev, sizeof(*minfo), GFP_KERNEL);
+	if (!minfo)
+		return -ENOMEM;
+
+	ret = scmi_imx_misc_attributes_get(ph, minfo);
+	if (ret)
+		return ret;
+
+	return ph->set_priv(ph, minfo, version);
+}
+
+static const struct scmi_protocol scmi_imx_misc = {
+	.id = SCMI_PROTOCOL_IMX_MISC,
+	.owner = THIS_MODULE,
+	.instance_init = &scmi_imx_misc_protocol_init,
+	.ops = &scmi_imx_misc_proto_ops,
+	.events = &scmi_imx_misc_protocol_events,
+	.supported_version = SCMI_PROTOCOL_SUPPORTED_VERSION,
+	.vendor_id = "NXP",
+	.sub_vendor_id = "IMX",
+};
+module_scmi_protocol(scmi_imx_misc);
+
+MODULE_DESCRIPTION("i.MX SCMI MISC driver");
+MODULE_LICENSE("GPL");

include/linux/scmi_imx_protocol.h

@@ -15,6 +15,7 @@
 
 enum scmi_nxp_protocol {
 	SCMI_PROTOCOL_IMX_BBM = 0x81,
+	SCMI_PROTOCOL_IMX_MISC = 0x84,
 };
 
 struct scmi_imx_bbm_proto_ops {
@@ -30,6 +31,7 @@ struct scmi_imx_bbm_proto_ops {
 enum scmi_nxp_notification_events {
 	SCMI_EVENT_IMX_BBM_RTC = 0x0,
 	SCMI_EVENT_IMX_BBM_BUTTON = 0x1,
+	SCMI_EVENT_IMX_MISC_CONTROL = 0x0,
 };
 
 struct scmi_imx_bbm_notif_report {
@@ -39,4 +41,19 @@ struct scmi_imx_bbm_notif_report {
 	unsigned int		rtc_id;
 	unsigned int		rtc_evt;
 };
+
+struct scmi_imx_misc_ctrl_notify_report {
+	ktime_t			timestamp;
+	unsigned int		ctrl_id;
+	unsigned int		flags;
+};
+
+struct scmi_imx_misc_proto_ops {
+	int (*misc_ctrl_set)(const struct scmi_protocol_handle *ph, u32 id,
+			     u32 num, u32 *val);
+	int (*misc_ctrl_get)(const struct scmi_protocol_handle *ph, u32 id,
+			     u32 *num, u32 *val);
+	int (*misc_ctrl_req_notify)(const struct scmi_protocol_handle *ph,
+				    u32 ctrl_id, u32 evt_id, u32 flags);
+};
 #endif