From 7fd7e2cf339ea2ec570f6dae1cdfaf8e066eb4af Mon Sep 17 00:00:00 2001
From: Ramon Fried <ramon.fried@gmail.com>
Date: Mon, 2 Jul 2018 02:57:59 +0300
Subject: [PATCH] drivers: smem: sandbox

Add Sandbox driver for SMEM. mostly stub operations.

Signed-off-by: Ramon Fried <ramon.fried@gmail.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
---
 arch/sandbox/dts/test.dts   |  4 ++++
 configs/sandbox64_defconfig |  2 ++
 configs/sandbox_defconfig   |  2 ++
 drivers/smem/Kconfig        |  9 +++++++++
 drivers/smem/Makefile       |  1 +
 drivers/smem/sandbox_smem.c | 45 +++++++++++++++++++++++++++++++++++++++++++++
 6 files changed, 63 insertions(+)
 create mode 100644 drivers/smem/sandbox_smem.c

diff --git a/arch/sandbox/dts/test.dts b/arch/sandbox/dts/test.dts
index 5752bf5..01e6bc0 100644
--- a/arch/sandbox/dts/test.dts
+++ b/arch/sandbox/dts/test.dts
@@ -382,6 +382,10 @@
 		remoteproc-name = "remoteproc-test-dev2";
 	};
 
+	smem@0 {
+		compatible = "sandbox,smem";
+	};
+
 	spi@0 {
 		#address-cells = <1>;
 		#size-cells = <0>;
diff --git a/configs/sandbox64_defconfig b/configs/sandbox64_defconfig
index 20a2ab3..1fa85a8 100644
--- a/configs/sandbox64_defconfig
+++ b/configs/sandbox64_defconfig
@@ -199,3 +199,5 @@ CONFIG_UT_TIME=y
 CONFIG_UT_DM=y
 CONFIG_UT_ENV=y
 CONFIG_UT_OVERLAY=y
+CONFIG_SMEM=y
+CONFIG_SANDBOX_SMEM=y
diff --git a/configs/sandbox_defconfig b/configs/sandbox_defconfig
index 2fc84a1..47f6bfd 100644
--- a/configs/sandbox_defconfig
+++ b/configs/sandbox_defconfig
@@ -200,3 +200,5 @@ CONFIG_UT_TIME=y
 CONFIG_UT_DM=y
 CONFIG_UT_ENV=y
 CONFIG_UT_OVERLAY=y
+CONFIG_SMEM=y
+CONFIG_SANDBOX_SMEM=y
diff --git a/drivers/smem/Kconfig b/drivers/smem/Kconfig
index 6cf5a4e..7169d0f 100644
--- a/drivers/smem/Kconfig
+++ b/drivers/smem/Kconfig
@@ -3,6 +3,15 @@ menuconfig SMEM
 
 if SMEM
 
+config SANDBOX_SMEM
+    bool "Sandbox Shared Memory Manager (SMEM)"
+    depends on SANDBOX && DM
+    help
+      enable SMEM support for sandbox. This is an emulation of a real SMEM
+      manager.
+      The sandbox driver allocates a shared memory from the heap and
+      initialzies it on start.
+
 config MSM_SMEM
     bool "Qualcomm Shared Memory Manager (SMEM)"
     depends on DM
diff --git a/drivers/smem/Makefile b/drivers/smem/Makefile
index 605b8fc..af3e9b5 100644
--- a/drivers/smem/Makefile
+++ b/drivers/smem/Makefile
@@ -2,5 +2,6 @@
 #
 # Makefile for the U-Boot SMEM interface drivers
 
+obj-$(CONFIG_SANDBOX_SMEM) += sandbox_smem.o
 obj-$(CONFIG_SMEM) += smem-uclass.o
 obj-$(CONFIG_MSM_SMEM) += msm_smem.o
diff --git a/drivers/smem/sandbox_smem.c b/drivers/smem/sandbox_smem.c
new file mode 100644
index 0000000..7397e44
--- /dev/null
+++ b/drivers/smem/sandbox_smem.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 <errno.h>
+#include <smem.h>
+#include <asm/test.h>
+
+static int sandbox_smem_alloc(unsigned int host,
+		unsigned int item, size_t size)
+{
+	return 0;
+}
+
+static void *sandbox_smem_get(unsigned int host,
+		unsigned int item, size_t *size)
+{
+	return NULL;
+}
+
+static int sandbox_smem_get_free_space(unsigned int host)
+{
+	return 0;
+}
+
+static const struct smem_ops sandbox_smem_ops = {
+	.alloc	= sandbox_smem_alloc,
+	.get	= sandbox_smem_get,
+	.get_free_space	= sandbox_smem_get_free_space,
+};
+
+static const struct udevice_id sandbox_smem_ids[] = {
+	{ .compatible = "sandbox,smem" },
+	{ }
+};
+
+U_BOOT_DRIVER(smem_sandbox) = {
+	.name		= "smem_sandbox",
+	.id		= UCLASS_SMEM,
+	.of_match	= sandbox_smem_ids,
+	.ops		= &sandbox_smem_ops,
+};