dm: SMEM (Shared memory) uclass

This is a uclass for Shared memory manager drivers.

A Shared Memory Manager driver implements an interface for allocating
and accessing items in the memory area shared among all of the
processors.

Signed-off-by: Ramon Fried <ramon.fried@gmail.com>

Reviewed-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Philipp Tomsich <philipp.tomsich@theobroma-systems.com>

4 files changed, 53 insertions, 0 deletions

diff --git a/drivers/Makefile b/drivers/Makefile
index 66834c33e3..276e5ee4d7 100644
--- a/drivers/Makefile
+++ b/drivers/Makefile
@@ -98,6 +98,7 @@ obj-y += pwm/
 obj-y += reset/
 obj-y += input/
 # SOC specific infrastructure drivers.
+obj-y += smem/
 obj-y += soc/
 obj-$(CONFIG_REMOTEPROC) += remoteproc/
 obj-y += thermal/
diff --git a/drivers/smem/Kconfig b/drivers/smem/Kconfig
new file mode 100644
index 0000000000..64337a8b8e
--- /dev/null
+++ b/drivers/smem/Kconfig
@@ -0,0 +1,2 @@
+menuconfig SMEM
+	bool  "SMEM (Shared Memory mamanger) support"
diff --git a/drivers/smem/Makefile b/drivers/smem/Makefile
new file mode 100644
index 0000000000..ca55c4512d
--- /dev/null
+++ b/drivers/smem/Makefile
@@ -0,0 +1,5 @@
+# SPDX-License-Identifier: GPL-2.0+
+#
+# Makefile for the U-Boot SMEM interface drivers
+
+obj-$(CONFIG_SMEM) += smem-uclass.o
diff --git a/drivers/smem/smem-uclass.c b/drivers/smem/smem-uclass.c
new file mode 100644
index 0000000000..ce7bf40656
--- /dev/null
+++ b/drivers/smem/smem-uclass.c
@@ -0,0 +1,45 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Copyright (c) 2018 Ramon Fried <ramon.fried@gmail.com>
+ */
+
+#include <common.h>
+#include <dm.h>
+#include <smem.h>
+
+int smem_alloc(struct udevice *dev, unsigned int host,
+		unsigned int item, size_t size)
+{
+	struct smem_ops *ops = smem_get_ops(dev);
+
+	if (!ops->alloc)
+		return -ENOSYS;
+
+	return ops->alloc(host, item, size);
+}
+
+void *smem_get(struct udevice *dev, unsigned int host,
+		unsigned int item, size_t *size)
+{
+	struct smem_ops *ops = smem_get_ops(dev);
+
+	if (!ops->get)
+		return NULL;
+
+	return ops->get(host, item, size);
+}
+
+int smem_get_free_space(struct udevice *dev, unsigned int host)
+{
+	struct smem_ops *ops = smem_get_ops(dev);
+
+	if (!ops->get_free_space)
+		return -ENOSYS;
+
+	return ops->get_free_space(host);
+}
+
+UCLASS_DRIVER(smem) = {
+	.id     = UCLASS_SMEM,
+	.name       = "smem",
+};