[2/3] add STIH4xx ION driver

diff --git a/drivers/staging/android/ion/Kconfig b/drivers/staging/android/ion/Kconfig
index c8fb413..eb47230 100644
--- a/drivers/staging/android/ion/Kconfig
+++ b/drivers/staging/android/ion/Kconfig
@@ -42,6 +42,13 @@  config ION_HISI
 
 source "drivers/staging/android/ion/hisilicon/Kconfig"
 
+config ION_STI
+        bool "stih4xx ION Driver"
+        depends on ARCH_STI && ION
+	select ION_OF
+        help
+          Choose this option if you wish to use ion on STIH4xx SoC.
+
 config ION_OF
 	bool "Devicetree support for Ion"
 	depends on ION && OF_ADDRESS
diff --git a/drivers/staging/android/ion/Makefile b/drivers/staging/android/ion/Makefile
index 5d630a0..bc02ea4 100644
--- a/drivers/staging/android/ion/Makefile
+++ b/drivers/staging/android/ion/Makefile
@@ -9,5 +9,7 @@  endif
 obj-$(CONFIG_ION_DUMMY) += ion_dummy_driver.o
 obj-$(CONFIG_ION_TEGRA) += tegra/
 obj-$(CONFIG_ION_HISI) += hisilicon/
+obj-$(CONFIG_ION_STI) += sti/
+
 obj-$(CONFIG_ION_OF) += ion_of.o
 
diff --git a/drivers/staging/android/ion/sti/Makefile b/drivers/staging/android/ion/sti/Makefile
new file mode 100644
index 0000000..5690431
--- /dev/null
+++ b/drivers/staging/android/ion/sti/Makefile
@@ -0,0 +1 @@ 
+obj-$(CONFIG_ION_STI) += sti_ion.o
diff --git a/drivers/staging/android/ion/sti/sti_ion.c b/drivers/staging/android/ion/sti/sti_ion.c
new file mode 100644
index 0000000..4c0f52b
--- /dev/null
+++ b/drivers/staging/android/ion/sti/sti_ion.c
@@ -0,0 +1,103 @@ 
+/*
+ * STIH4xx ION Driver
+ *
+ * Copyright (c) 2016 STMicroelectronics
+ *
+ * Author: Benjamin Gaignard <benjamin.gaignard@st.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include <linux/err.h>
+#include <linux/mm.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/platform_device.h>
+#include <linux/slab.h>
+
+#include "../ion_priv.h"
+#include "../ion.h"
+#include "../ion_of.h"
+
+struct sti_ion_dev {
+	struct ion_heap	**heaps;
+	struct ion_device *idev;
+	struct ion_platform_data *data;
+};
+
+static struct ion_of_heap sti_heaps[] = {
+	PLATFORM_HEAP("st,cma", 0, ION_HEAP_TYPE_DMA, "cma"),
+	{}
+};
+
+static int sti_ion_probe(struct platform_device *pdev)
+{
+	struct sti_ion_dev *ipdev;
+	int i;
+
+	ipdev = devm_kzalloc(&pdev->dev, sizeof(*ipdev), GFP_KERNEL);
+	if (!ipdev)
+		return -ENOMEM;
+
+	platform_set_drvdata(pdev, ipdev);
+
+	ipdev->idev = ion_device_create(NULL);
+	if (IS_ERR(ipdev->idev))
+		return PTR_ERR(ipdev->idev);
+
+	ipdev->data = ion_parse_dt(pdev, sti_heaps);
+	if (IS_ERR(ipdev->data))
+		return PTR_ERR(ipdev->data);
+
+	ipdev->heaps = devm_kzalloc(&pdev->dev,
+				sizeof(struct ion_heap) * ipdev->data->nr,
+				GFP_KERNEL);
+	if (!ipdev->heaps) {
+		ion_destroy_platform_data(ipdev->data);
+		return -ENOMEM;
+	}
+
+	for (i = 0; i < ipdev->data->nr; i++) {
+		ipdev->heaps[i] = ion_heap_create(&ipdev->data->heaps[i]);
+		if (!ipdev->heaps) {
+			ion_destroy_platform_data(ipdev->data);
+			return -ENOMEM;
+		}
+		ion_device_add_heap(ipdev->idev, ipdev->heaps[i]);
+	}
+	return 0;
+}
+
+static int sti_ion_remove(struct platform_device *pdev)
+{
+	struct sti_ion_dev *ipdev;
+	int i;
+
+	ipdev = platform_get_drvdata(pdev);
+
+	for (i = 0; i < ipdev->data->nr; i++)
+		ion_heap_destroy(ipdev->heaps[i]);
+
+	ion_destroy_platform_data(ipdev->data);
+	ion_device_destroy(ipdev->idev);
+
+	return 0;
+}
+
+static const struct of_device_id sti_ion_match_table[] = {
+	{.compatible = "st,sti-ion"},
+	{},
+};
+
+static struct platform_driver sti_ion_driver = {
+	.probe = sti_ion_probe,
+	.remove = sti_ion_remove,
+	.driver = {
+		.name = "ion-sti",
+		.of_match_table = sti_ion_match_table,
+	},
+};
+
+module_platform_driver(sti_ion_driver);