summaryrefslogtreecommitdiff
path: root/arch/avr32/boards/mimc200/fram.c
diff options
context:
space:
mode:
authorSrikant Patnaik2015-01-11 12:28:04 +0530
committerSrikant Patnaik2015-01-11 12:28:04 +0530
commit871480933a1c28f8a9fed4c4d34d06c439a7a422 (patch)
tree8718f573808810c2a1e8cb8fb6ac469093ca2784 /arch/avr32/boards/mimc200/fram.c
parent9d40ac5867b9aefe0722bc1f110b965ff294d30d (diff)
downloadFOSSEE-netbook-kernel-source-871480933a1c28f8a9fed4c4d34d06c439a7a422.tar.gz
FOSSEE-netbook-kernel-source-871480933a1c28f8a9fed4c4d34d06c439a7a422.tar.bz2
FOSSEE-netbook-kernel-source-871480933a1c28f8a9fed4c4d34d06c439a7a422.zip
Moved, renamed, and deleted files
The original directory structure was scattered and unorganized. Changes are basically to make it look like kernel structure.
Diffstat (limited to 'arch/avr32/boards/mimc200/fram.c')
-rw-r--r--arch/avr32/boards/mimc200/fram.c81
1 files changed, 81 insertions, 0 deletions
diff --git a/arch/avr32/boards/mimc200/fram.c b/arch/avr32/boards/mimc200/fram.c
new file mode 100644
index 00000000..9764a1a1
--- /dev/null
+++ b/arch/avr32/boards/mimc200/fram.c
@@ -0,0 +1,81 @@
+/*
+ * 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,
+ .llseek = noop_llseek,
+};
+
+#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);