[PATCH v3 3/6] firmware: arm_scmi: add initial support for i.MX BBM protocol
Peng Fan (OSS)
peng.fan at oss.nxp.com
Fri Apr 12 03:47:09 PDT 2024
From: Peng Fan <peng.fan at nxp.com>
i.MX95 has a battery-backed module(BBM), which has persistent storage (GPR),
an RTC, and the ON/OFF button. The System Manager(SM) firmware use SCMI vendor
protocol(SCMI BBM) to let agent be able to use GPR, RTC and ON/OFF
button.
Signed-off-by: Peng Fan <peng.fan at nxp.com>
---
drivers/firmware/arm_scmi/Kconfig | 10 +
drivers/firmware/arm_scmi/Makefile | 1 +
drivers/firmware/arm_scmi/imx-sm-bbm.c | 378 +++++++++++++++++++++++++++++++++
include/linux/scmi_imx_protocol.h | 45 ++++
4 files changed, 434 insertions(+)
diff --git a/drivers/firmware/arm_scmi/Kconfig b/drivers/firmware/arm_scmi/Kconfig
index aa5842be19b2..56d11c9d9f47 100644
--- a/drivers/firmware/arm_scmi/Kconfig
+++ b/drivers/firmware/arm_scmi/Kconfig
@@ -181,3 +181,13 @@ config ARM_SCMI_POWER_CONTROL
early shutdown/reboot SCMI requests.
endmenu
+
+config IMX_SCMI_BBM_EXT
+ tristate "i.MX SCMI BBM EXTENSION"
+ depends on ARM_SCMI_PROTOCOL || (COMPILE_TEST && OF)
+ default y if ARCH_MXC
+ help
+ This enables i.MX System BBM control logic which supports RTC
+ and BUTTON.
+
+ This driver can also be built as a module.
diff --git a/drivers/firmware/arm_scmi/Makefile b/drivers/firmware/arm_scmi/Makefile
index a7bc4796519c..327687acf857 100644
--- a/drivers/firmware/arm_scmi/Makefile
+++ b/drivers/firmware/arm_scmi/Makefile
@@ -11,6 +11,7 @@ scmi-transport-$(CONFIG_ARM_SCMI_HAVE_MSG) += msg.o
scmi-transport-$(CONFIG_ARM_SCMI_TRANSPORT_VIRTIO) += virtio.o
scmi-transport-$(CONFIG_ARM_SCMI_TRANSPORT_OPTEE) += optee.o
scmi-protocols-y = base.o clock.o perf.o power.o reset.o sensors.o system.o voltage.o powercap.o
+scmi-protocols-$(CONFIG_IMX_SCMI_BBM_EXT) += imx-sm-bbm.o
scmi-module-objs := $(scmi-driver-y) $(scmi-protocols-y) $(scmi-transport-y)
obj-$(CONFIG_ARM_SCMI_PROTOCOL) += scmi-core.o
diff --git a/drivers/firmware/arm_scmi/imx-sm-bbm.c b/drivers/firmware/arm_scmi/imx-sm-bbm.c
new file mode 100644
index 000000000000..7ee699cc4215
--- /dev/null
+++ b/drivers/firmware/arm_scmi/imx-sm-bbm.c
@@ -0,0 +1,378 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * System Control and Management Interface (SCMI) NXP BBM Protocol
+ *
+ * Copyright 2024 NXP
+ */
+
+#define pr_fmt(fmt) "SCMI Notifications BBM - " 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
+
+enum scmi_imx_bbm_protocol_cmd {
+ IMX_BBM_GPR_SET = 0x3,
+ IMX_BBM_GPR_GET = 0x4,
+ IMX_BBM_RTC_ATTRIBUTES = 0x5,
+ IMX_BBM_RTC_TIME_SET = 0x6,
+ IMX_BBM_RTC_TIME_GET = 0x7,
+ IMX_BBM_RTC_ALARM_SET = 0x8,
+ IMX_BBM_BUTTON_GET = 0x9,
+ IMX_BBM_RTC_NOTIFY = 0xA,
+ IMX_BBM_BUTTON_NOTIFY = 0xB,
+};
+
+#define GET_RTCS_NR(x) le32_get_bits((x), GENMASK(23, 16))
+#define GET_GPRS_NR(x) le32_get_bits((x), GENMASK(15, 0))
+
+#define SCMI_IMX_BBM_NOTIFY_RTC_UPDATED BIT(2)
+#define SCMI_IMX_BBM_NOTIFY_RTC_ROLLOVER BIT(1)
+#define SCMI_IMX_BBM_NOTIFY_RTC_ALARM BIT(0)
+
+#define SCMI_IMX_BBM_RTC_ALARM_ENABLE_FLAG BIT(0)
+
+#define SCMI_IMX_BBM_NOTIFY_RTC_FLAG \
+ (SCMI_IMX_BBM_NOTIFY_RTC_UPDATED | SCMI_IMX_BBM_NOTIFY_RTC_ROLLOVER | \
+ SCMI_IMX_BBM_NOTIFY_RTC_ALARM)
+
+#define SCMI_IMX_BBM_EVENT_RTC_MASK GENMASK(31, 24)
+
+struct scmi_imx_bbm_info {
+ u32 version;
+ int nr_rtc;
+ int nr_gpr;
+};
+
+struct scmi_msg_imx_bbm_protocol_attributes {
+ __le32 attributes;
+};
+
+struct scmi_imx_bbm_set_time {
+ __le32 id;
+ __le32 flags;
+ __le32 value_low;
+ __le32 value_high;
+};
+
+struct scmi_imx_bbm_get_time {
+ __le32 id;
+ __le32 flags;
+};
+
+struct scmi_imx_bbm_alarm_time {
+ __le32 id;
+ __le32 flags;
+ __le32 value_low;
+ __le32 value_high;
+};
+
+struct scmi_msg_imx_bbm_rtc_notify {
+ __le32 rtc_id;
+ __le32 flags;
+};
+
+struct scmi_msg_imx_bbm_button_notify {
+ __le32 flags;
+};
+
+struct scmi_imx_bbm_notify_payld {
+ __le32 flags;
+};
+
+static int scmi_imx_bbm_attributes_get(const struct scmi_protocol_handle *ph,
+ struct scmi_imx_bbm_info *pi)
+{
+ int ret;
+ struct scmi_xfer *t;
+ struct scmi_msg_imx_bbm_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) {
+ pi->nr_rtc = GET_RTCS_NR(attr->attributes);
+ pi->nr_gpr = GET_GPRS_NR(attr->attributes);
+ }
+
+ ph->xops->xfer_put(ph, t);
+
+ return ret;
+}
+
+static int scmi_imx_bbm_notify(const struct scmi_protocol_handle *ph,
+ u32 src_id, int message_id, bool enable)
+{
+ int ret;
+ struct scmi_xfer *t;
+
+ if (message_id == IMX_BBM_RTC_NOTIFY) {
+ struct scmi_msg_imx_bbm_rtc_notify *rtc_notify;
+
+ ret = ph->xops->xfer_get_init(ph, message_id,
+ sizeof(*rtc_notify), 0, &t);
+ if (ret)
+ return ret;
+
+ rtc_notify = t->tx.buf;
+ rtc_notify->rtc_id = cpu_to_le32(0);
+ rtc_notify->flags =
+ cpu_to_le32(enable ? SCMI_IMX_BBM_NOTIFY_RTC_FLAG : 0);
+ } else if (message_id == IMX_BBM_BUTTON_NOTIFY) {
+ struct scmi_msg_imx_bbm_button_notify *button_notify;
+
+ ret = ph->xops->xfer_get_init(ph, message_id,
+ sizeof(*button_notify), 0, &t);
+ if (ret)
+ return ret;
+
+ button_notify = t->tx.buf;
+ button_notify->flags = cpu_to_le32(enable ? 1 : 0);
+ } else {
+ return -EINVAL;
+ }
+
+ ret = ph->xops->do_xfer(ph, t);
+
+ ph->xops->xfer_put(ph, t);
+ return ret;
+}
+
+static enum scmi_imx_bbm_protocol_cmd evt_2_cmd[] = {
+ IMX_BBM_RTC_NOTIFY,
+ IMX_BBM_BUTTON_NOTIFY
+};
+
+static int scmi_imx_bbm_set_notify_enabled(const struct scmi_protocol_handle *ph,
+ u8 evt_id, u32 src_id, bool enable)
+{
+ int ret, cmd_id;
+
+ if (evt_id >= ARRAY_SIZE(evt_2_cmd))
+ return -EINVAL;
+
+ cmd_id = evt_2_cmd[evt_id];
+ ret = scmi_imx_bbm_notify(ph, src_id, cmd_id, enable);
+ if (ret)
+ pr_debug("FAIL_ENABLED - evt[%X] dom[%d] - ret:%d\n",
+ evt_id, src_id, ret);
+
+ return ret;
+}
+
+static void *scmi_imx_bbm_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_bbm_notify_payld *p = payld;
+ struct scmi_imx_bbm_notif_report *r = report;
+
+ if (sizeof(*p) != payld_sz)
+ return NULL;
+
+ if (evt_id == SCMI_EVENT_IMX_BBM_RTC) {
+ r->is_rtc = true;
+ r->is_button = false;
+ r->timestamp = timestamp;
+ r->rtc_id = le32_get_bits(p->flags, SCMI_IMX_BBM_EVENT_RTC_MASK);
+ r->rtc_evt = le32_get_bits(p->flags, SCMI_IMX_BBM_NOTIFY_RTC_FLAG);
+ dev_dbg(ph->dev, "RTC: %d evt: %x\n", r->rtc_id, r->rtc_evt);
+ *src_id = r->rtc_evt;
+ } else if (evt_id == SCMI_EVENT_IMX_BBM_BUTTON) {
+ r->is_rtc = false;
+ r->is_button = true;
+ r->timestamp = timestamp;
+ dev_dbg(ph->dev, "BBM Button\n");
+ *src_id = 0;
+ } else {
+ WARN_ON_ONCE(1);
+ return NULL;
+ }
+
+ return r;
+}
+
+static const struct scmi_event scmi_imx_bbm_events[] = {
+ {
+ .id = SCMI_EVENT_IMX_BBM_RTC,
+ .max_payld_sz = sizeof(struct scmi_imx_bbm_notify_payld),
+ .max_report_sz = sizeof(struct scmi_imx_bbm_notif_report),
+ },
+ {
+ .id = SCMI_EVENT_IMX_BBM_BUTTON,
+ .max_payld_sz = sizeof(struct scmi_imx_bbm_notify_payld),
+ .max_report_sz = sizeof(struct scmi_imx_bbm_notif_report),
+ },
+};
+
+static const struct scmi_event_ops scmi_imx_bbm_event_ops = {
+ .set_notify_enabled = scmi_imx_bbm_set_notify_enabled,
+ .fill_custom_report = scmi_imx_bbm_fill_custom_report,
+};
+
+static const struct scmi_protocol_events scmi_imx_bbm_protocol_events = {
+ .queue_sz = SCMI_PROTO_QUEUE_SZ,
+ .ops = &scmi_imx_bbm_event_ops,
+ .evts = scmi_imx_bbm_events,
+ .num_events = ARRAY_SIZE(scmi_imx_bbm_events),
+ .num_sources = 1,
+};
+
+static int scmi_imx_bbm_protocol_init(const struct scmi_protocol_handle *ph)
+{
+ u32 version;
+ int ret;
+ struct scmi_imx_bbm_info *binfo;
+
+ ret = ph->xops->version_get(ph, &version);
+ if (ret)
+ return ret;
+
+ dev_info(ph->dev, "NXP SM BBM Version %d.%d\n",
+ PROTOCOL_REV_MAJOR(version), PROTOCOL_REV_MINOR(version));
+
+ binfo = devm_kzalloc(ph->dev, sizeof(*binfo), GFP_KERNEL);
+ if (!binfo)
+ return -ENOMEM;
+
+ ret = scmi_imx_bbm_attributes_get(ph, binfo);
+ if (ret)
+ return ret;
+
+ return ph->set_priv(ph, binfo, version);
+}
+
+static int scmi_imx_bbm_rtc_time_set(const struct scmi_protocol_handle *ph,
+ u32 rtc_id, u64 sec)
+{
+ struct scmi_imx_bbm_info *pi = ph->get_priv(ph);
+ struct scmi_imx_bbm_set_time *cfg;
+ struct scmi_xfer *t;
+ int ret;
+
+ if (rtc_id >= pi->nr_rtc)
+ return -EINVAL;
+
+ ret = ph->xops->xfer_get_init(ph, IMX_BBM_RTC_TIME_SET, sizeof(*cfg), 0, &t);
+ if (ret)
+ return ret;
+
+ cfg = t->tx.buf;
+ cfg->id = cpu_to_le32(rtc_id);
+ cfg->flags = 0;
+ cfg->value_low = cpu_to_le32(lower_32_bits(sec));
+ cfg->value_high = cpu_to_le32(upper_32_bits(sec));
+
+ ret = ph->xops->do_xfer(ph, t);
+
+ ph->xops->xfer_put(ph, t);
+
+ return ret;
+}
+
+static int scmi_imx_bbm_rtc_time_get(const struct scmi_protocol_handle *ph,
+ u32 rtc_id, u64 *value)
+{
+ struct scmi_imx_bbm_info *pi = ph->get_priv(ph);
+ struct scmi_imx_bbm_get_time *cfg;
+ struct scmi_xfer *t;
+ int ret;
+
+ if (rtc_id >= pi->nr_rtc)
+ return -EINVAL;
+
+ ret = ph->xops->xfer_get_init(ph, IMX_BBM_RTC_TIME_GET, sizeof(*cfg),
+ sizeof(u64), &t);
+ if (ret)
+ return ret;
+
+ cfg = t->tx.buf;
+ cfg->id = cpu_to_le32(rtc_id);
+ cfg->flags = 0;
+
+ ret = ph->xops->do_xfer(ph, t);
+ if (!ret)
+ *value = get_unaligned_le64(t->rx.buf);
+
+ ph->xops->xfer_put(ph, t);
+
+ return ret;
+}
+
+static int scmi_imx_bbm_rtc_alarm_set(const struct scmi_protocol_handle *ph,
+ u32 rtc_id, u64 sec)
+{
+ struct scmi_imx_bbm_info *pi = ph->get_priv(ph);
+ struct scmi_imx_bbm_alarm_time *cfg;
+ struct scmi_xfer *t;
+ int ret;
+
+ if (rtc_id >= pi->nr_rtc)
+ return -EINVAL;
+
+ ret = ph->xops->xfer_get_init(ph, IMX_BBM_RTC_ALARM_SET, sizeof(*cfg), 0, &t);
+ if (ret)
+ return ret;
+
+ cfg = t->tx.buf;
+ cfg->id = cpu_to_le32(rtc_id);
+ cfg->flags = SCMI_IMX_BBM_RTC_ALARM_ENABLE_FLAG;
+ cfg->value_low = cpu_to_le32(lower_32_bits(sec));
+ cfg->value_high = cpu_to_le32(upper_32_bits(sec));
+
+ ret = ph->xops->do_xfer(ph, t);
+
+ ph->xops->xfer_put(ph, t);
+
+ return ret;
+}
+
+static int scmi_imx_bbm_button_get(const struct scmi_protocol_handle *ph, u32 *state)
+{
+ struct scmi_xfer *t;
+ int ret;
+
+ ret = ph->xops->xfer_get_init(ph, IMX_BBM_BUTTON_GET, 0, sizeof(u32), &t);
+ if (ret)
+ return ret;
+
+ ret = ph->xops->do_xfer(ph, t);
+ if (!ret)
+ *state = get_unaligned_le32(t->rx.buf);
+
+ ph->xops->xfer_put(ph, t);
+
+ return ret;
+}
+
+static const struct scmi_imx_bbm_proto_ops scmi_imx_bbm_proto_ops = {
+ .rtc_time_get = scmi_imx_bbm_rtc_time_get,
+ .rtc_time_set = scmi_imx_bbm_rtc_time_set,
+ .rtc_alarm_set = scmi_imx_bbm_rtc_alarm_set,
+ .button_get = scmi_imx_bbm_button_get,
+};
+
+static const struct scmi_protocol scmi_imx_bbm = {
+ .id = SCMI_PROTOCOL_IMX_BBM,
+ .owner = THIS_MODULE,
+ .instance_init = &scmi_imx_bbm_protocol_init,
+ .ops = &scmi_imx_bbm_proto_ops,
+ .events = &scmi_imx_bbm_protocol_events,
+ .supported_version = SCMI_PROTOCOL_SUPPORTED_VERSION,
+};
+
+module_scmi_protocol(scmi_imx_bbm);
diff --git a/include/linux/scmi_imx_protocol.h b/include/linux/scmi_imx_protocol.h
new file mode 100644
index 000000000000..90ce011a4429
--- /dev/null
+++ b/include/linux/scmi_imx_protocol.h
@@ -0,0 +1,45 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+/*
+ * SCMI Message Protocol driver NXP extension header
+ *
+ * Copyright 2024 NXP.
+ */
+
+#ifndef _LINUX_SCMI_NXP_PROTOCOL_H
+#define _LINUX_SCMI_NXP_PROTOCOL_H
+
+#include <linux/bitfield.h>
+#include <linux/device.h>
+#include <linux/notifier.h>
+#include <linux/types.h>
+
+enum scmi_nxp_protocol {
+ SCMI_PROTOCOL_IMX_BBM = 0x81,
+};
+
+struct scmi_imx_bbm_proto_ops {
+ int (*rtc_time_set)(const struct scmi_protocol_handle *ph, u32 id,
+ uint64_t sec);
+ int (*rtc_time_get)(const struct scmi_protocol_handle *ph, u32 id,
+ u64 *val);
+ int (*rtc_alarm_set)(const struct scmi_protocol_handle *ph, u32 id,
+ u64 sec);
+ int (*button_get)(const struct scmi_protocol_handle *ph, u32 *state);
+};
+
+enum scmi_nxp_notification_events {
+ SCMI_EVENT_IMX_BBM_RTC = 0x0,
+ SCMI_EVENT_IMX_BBM_BUTTON = 0x1,
+ SCMI_EVENT_IMX_MISC_CONTROL_DISABLED = 0x0,
+ SCMI_EVENT_IMX_MISC_CONTROL_FALLING_EDGE = 0x1,
+ SCMI_EVENT_IMX_MISC_CONTROL_RISING_EDGE = 0x2,
+};
+
+struct scmi_imx_bbm_notif_report {
+ bool is_rtc;
+ bool is_button;
+ ktime_t timestamp;
+ unsigned int rtc_id;
+ unsigned int rtc_evt;
+};
+#endif
--
2.37.1
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