1 files changed, 80 insertions, 0 deletions
diff --git a/arch/avr32/boards/mimc200/fram.c b/arch/avr32/boards/mimc200/fram.c
new file mode 100644
index 00000000000..54fbd95cee9
--- /dev/null
+++ b/arch/avr32/boards/mimc200/fram.c
@@ -0,0 +1,80 @@
+/*
+ * FRAM driver for MIMC200 board
+ *
+ * Copyright 2008 Mark Jackson <mpfj@mimc.co.uk>
+ *
+ * This module adds *very* simply support for the system's FRAM device.
+ * At the moment, this is hard-coded to the MIMC200 platform, and only
+ * supports mmap().
+ */
+
+#define FRAM_VERSION	"1.0"
+
+#include <linux/miscdevice.h>
+#include <linux/proc_fs.h>
+#include <linux/mm.h>
+#include <linux/io.h>
+
+#define FRAM_BASE	0xac000000
+#define FRAM_SIZE	0x20000
+
+/*
+ * The are the file operation function for user access to /dev/fram
+ */
+
+static int fram_mmap(struct file *filp, struct vm_area_struct *vma)
+{
+	int ret;
+
+	ret = remap_pfn_range(vma,
+		vma->vm_start,
+		virt_to_phys((void *)((unsigned long)FRAM_BASE)) >> PAGE_SHIFT,
+		vma->vm_end-vma->vm_start,
+		PAGE_SHARED);
+
+	if (ret != 0)
+		return -EAGAIN;
+
+	return 0;
+}
+
+static const struct file_operations fram_fops = {
+	.owner			= THIS_MODULE,
+	.mmap			= fram_mmap,
+};
+
+#define FRAM_MINOR	0
+
+static struct miscdevice fram_dev = {
+	FRAM_MINOR,
+	"fram",
+	&fram_fops
+};
+
+static int __init
+fram_init(void)
+{
+	int ret;
+
+	ret = misc_register(&fram_dev);
+	if (ret) {
+		printk(KERN_ERR "fram: can't misc_register on minor=%d\n",
+		    FRAM_MINOR);
+		return ret;
+	}
+	printk(KERN_INFO "FRAM memory driver v" FRAM_VERSION "\n");
+	return 0;
+}
+
+static void __exit
+fram_cleanup_module(void)
+{
+	misc_deregister(&fram_dev);
+}
+
+module_init(fram_init);
+module_exit(fram_cleanup_module);
+
+MODULE_LICENSE("GPL");
+
+MODULE_ALIAS_MISCDEV(FRAM_MINOR);