@@ -2,6 +2,7 @@
# Makefile for the linux kernel.
#
obj-$(CONFIG_ARM_PSCI_FW) += psci.o
+obj-$(CONFIG_ARM_SCPI_PROTOCOL) += scpi.o
obj-$(CONFIG_ARM_SCPI_PROTOCOL) += arm_scpi.o
obj-$(CONFIG_DMI) += dmi_scan.o
obj-$(CONFIG_DMI_SYSFS) += dmi-sysfs.o
new file mode 100644
@@ -0,0 +1,110 @@
+/*
+ * System Control and Power Interface (SCPI) Message Protocol framework
+ *
+ * SCPI Message Protocol is used between the System Control Processor(SCP)
+ * and the Application Processors(AP). The Message Handling Unit(MHU)
+ * provides a mechanism for inter-processor communication between SCP's
+ * Cortex M3 and AP.
+ *
+ * SCP offers control and management of the core/cluster power states,
+ * various power domain DVFS including the core/cluster, certain system
+ * clocks configuration, thermal sensors and many others.
+ *
+ * Copyright (C) 2015 ARM Ltd.
+ * Copyright (C) 2016 BayLibre, SAS.
+ * Author: Neil Armstrong <narmstrong@baylibre.com>
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <linux/device.h>
+#include <linux/err.h>
+#include <linux/export.h>
+#include <linux/io.h>
+#include <linux/kernel.h>
+#include <linux/list.h>
+#include <linux/of.h>
+#include <linux/scpi_protocol.h>
+#include <linux/spinlock.h>
+
+static DEFINE_MUTEX(scpi_list_mutex);
+static LIST_HEAD(scpi_drivers_list);
+
+struct scpi_ops *of_scpi_ops_get(struct device_node *node)
+{
+ struct scpi_ops *ops = NULL;
+ struct scpi_driver *r;
+
+ if (!node)
+ return ERR_PTR(-EINVAL);
+
+ mutex_lock(&scpi_list_mutex);
+ list_for_each_entry(r, &scpi_drivers_list, list) {
+ if (node == r->node) {
+ ops = r->ops;
+ break;
+ }
+ }
+ mutex_unlock(&scpi_list_mutex);
+
+ if (!ops)
+ return ERR_PTR(-EPROBE_DEFER);
+
+ return ops;
+}
+EXPORT_SYMBOL_GPL(of_scpi_ops_get);
+
+int scpi_driver_register(struct scpi_driver *drv)
+{
+ mutex_lock(&scpi_list_mutex);
+ list_add(&drv->list, &scpi_drivers_list);
+ mutex_unlock(&scpi_list_mutex);
+
+ return 0;
+}
+EXPORT_SYMBOL_GPL(scpi_driver_register);
+
+void scpi_driver_unregister(struct scpi_driver *drv)
+{
+ mutex_lock(&scpi_list_mutex);
+ list_del(&drv->list);
+ mutex_unlock(&scpi_list_mutex);
+}
+EXPORT_SYMBOL_GPL(scpi_driver_unregister);
+
+static void devm_scpi_driver_unregister(struct device *dev, void *res)
+{
+ scpi_driver_unregister(*(struct scpi_driver **)res);
+}
+
+int devm_scpi_driver_register(struct device *dev,
+ struct scpi_driver *drv)
+{
+ struct scpi_driver **rcdrv;
+ int ret;
+
+ rcdrv = devres_alloc(devm_scpi_driver_unregister, sizeof(*drv),
+ GFP_KERNEL);
+ if (!rcdrv)
+ return -ENOMEM;
+
+ ret = scpi_driver_register(drv);
+ if (!ret) {
+ *rcdrv = drv;
+ devres_add(dev, rcdrv);
+ } else
+ devres_free(rcdrv);
+
+ return ret;
+}
+EXPORT_SYMBOL_GPL(devm_scpi_driver_register);
Add a thin "register" interface for SCPI driver in order to register their ops along their node. Since nodes using the SCPI ops are currently sub-nodes, does not implement phandle xlate stuff. Signed-off-by: Neil Armstrong <narmstrong@baylibre.com> --- drivers/firmware/Makefile | 1 + drivers/firmware/scpi.c | 110 ++++++++++++++++++++++++++++++++++++++++++++++ 2 files changed, 111 insertions(+) create mode 100644 drivers/firmware/scpi.c