From 92b3c1108be5d1522e729e9a18e0eb40653489e9 Mon Sep 17 00:00:00 2001
From: "S.J.R. van Schaik" <stephan@whiteboxsystems.nl>
Date: Sat, 11 Mar 2017 12:42:32 +0000
Subject: [PATCH] flash: implement flash driver model

---
 Makefile            |  2 ++
 include/flash.h     | 20 ++++++++++++++++++++
 source/core/flash.c | 29 +++++++++++++++++++++++++++++
 3 files changed, 51 insertions(+)
 create mode 100644 include/flash.h
 create mode 100644 source/core/flash.c

diff --git a/Makefile b/Makefile
index 823d6a7..f4bebc5 100644
--- a/Makefile
+++ b/Makefile
@@ -22,6 +22,8 @@ obj-y += source/shell.o
 obj-y += source/spi_flash.o
 obj-y += source/usart.o
 
+obj-y += source/core/flash.o
+
 obj = $(addprefix $(BUILD)/, $(obj-y))
 
 # Include the dependencies.
diff --git a/include/flash.h b/include/flash.h
new file mode 100644
index 0000000..cb5c348
--- /dev/null
+++ b/include/flash.h
@@ -0,0 +1,20 @@
+#pragma once
+
+struct flash_dev;
+
+struct flash_ops {
+	int (* read)(struct flash_dev *dev, uint32_t addr, void *data, size_t len);
+	int (* write)(struct flash_dev *dev, uint32_t addr, const void *data,
+		size_t len);
+	int (* erase)(struct flash_dev *dev, uint32_t addr, size_t len);
+};
+
+struct flash_dev {
+	struct flash_ops *ops;
+	void *priv;
+};
+
+int flash_read(struct flash_dev *dev, uint32_t addr, void *data, size_t len);
+int flash_write(struct flash_dev *dev, uint32_t addr, const void *data,
+	size_t len);
+int flash_erase(struct flash_dev *dev, uint32_t addr, size_t len);
diff --git a/source/core/flash.c b/source/core/flash.c
new file mode 100644
index 0000000..959923a
--- /dev/null
+++ b/source/core/flash.c
@@ -0,0 +1,29 @@
+#include <stdint.h>
+#include <stdlib.h>
+
+#include <flash.h>
+
+int flash_read(struct flash_dev *dev, uint32_t addr, void *data, size_t len)
+{
+	if (!dev)
+		return -1;
+
+	return dev->ops->read(dev, addr, data, len);
+}
+
+int flash_write(struct flash_dev *dev, uint32_t addr, const void *data,
+	size_t len)
+{
+	if (!dev)
+		return -1;
+
+	return dev->ops->write(dev, addr, data, len);
+}
+
+int flash_erase(struct flash_dev *dev, uint32_t addr, size_t len)
+{
+	if (!dev)
+		return -1;
+
+	return dev->ops->erase(dev, addr, len);
+}