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path: root/drivers/mtd/maps/uclinux.c
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Diffstat (limited to 'drivers/mtd/maps/uclinux.c')
-rw-r--r--drivers/mtd/maps/uclinux.c127
1 files changed, 127 insertions, 0 deletions
diff --git a/drivers/mtd/maps/uclinux.c b/drivers/mtd/maps/uclinux.c
new file mode 100644
index 0000000..811d92e
--- /dev/null
+++ b/drivers/mtd/maps/uclinux.c
@@ -0,0 +1,127 @@
+/****************************************************************************/
+
+/*
+ * uclinux.c -- generic memory mapped MTD driver for uclinux
+ *
+ * (C) Copyright 2002, Greg Ungerer (gerg@snapgear.com)
+ *
+ * $Id: uclinux.c,v 1.10 2005/01/05 18:05:13 dwmw2 Exp $
+ */
+
+/****************************************************************************/
+
+#include <linux/config.h>
+#include <linux/module.h>
+#include <linux/types.h>
+#include <linux/init.h>
+#include <linux/kernel.h>
+#include <linux/fs.h>
+#include <linux/major.h>
+#include <linux/root_dev.h>
+#include <linux/mtd/mtd.h>
+#include <linux/mtd/map.h>
+#include <linux/mtd/partitions.h>
+#include <asm/io.h>
+
+/****************************************************************************/
+
+
+/****************************************************************************/
+
+struct map_info uclinux_ram_map = {
+ .name = "RAM",
+};
+
+struct mtd_info *uclinux_ram_mtdinfo;
+
+/****************************************************************************/
+
+struct mtd_partition uclinux_romfs[] = {
+ { .name = "ROMfs" }
+};
+
+#define NUM_PARTITIONS (sizeof(uclinux_romfs) / sizeof(uclinux_romfs[0]))
+
+/****************************************************************************/
+
+int uclinux_point(struct mtd_info *mtd, loff_t from, size_t len,
+ size_t *retlen, u_char **mtdbuf)
+{
+ struct map_info *map = mtd->priv;
+ *mtdbuf = (u_char *) (map->virt + ((int) from));
+ *retlen = len;
+ return(0);
+}
+
+/****************************************************************************/
+
+int __init uclinux_mtd_init(void)
+{
+ struct mtd_info *mtd;
+ struct map_info *mapp;
+ extern char _ebss;
+
+ mapp = &uclinux_ram_map;
+ mapp->phys = (unsigned long) &_ebss;
+ mapp->size = PAGE_ALIGN(*((unsigned long *)((&_ebss) + 8)));
+ mapp->bankwidth = 4;
+
+ printk("uclinux[mtd]: RAM probe address=0x%x size=0x%x\n",
+ (int) mapp->map_priv_2, (int) mapp->size);
+
+ mapp->virt = ioremap_nocache(mapp->phys, mapp->size);
+
+ if (mapp->virt == 0) {
+ printk("uclinux[mtd]: ioremap_nocache() failed\n");
+ return(-EIO);
+ }
+
+ simple_map_init(mapp);
+
+ mtd = do_map_probe("map_ram", mapp);
+ if (!mtd) {
+ printk("uclinux[mtd]: failed to find a mapping?\n");
+ iounmap(mapp->virt);
+ return(-ENXIO);
+ }
+
+ mtd->owner = THIS_MODULE;
+ mtd->point = uclinux_point;
+ mtd->priv = mapp;
+
+ uclinux_ram_mtdinfo = mtd;
+ add_mtd_partitions(mtd, uclinux_romfs, NUM_PARTITIONS);
+
+ printk("uclinux[mtd]: set %s to be root filesystem\n",
+ uclinux_romfs[0].name);
+ ROOT_DEV = MKDEV(MTD_BLOCK_MAJOR, 0);
+ put_mtd_device(mtd);
+
+ return(0);
+}
+
+/****************************************************************************/
+
+void __exit uclinux_mtd_cleanup(void)
+{
+ if (uclinux_ram_mtdinfo) {
+ del_mtd_partitions(uclinux_ram_mtdinfo);
+ map_destroy(uclinux_ram_mtdinfo);
+ uclinux_ram_mtdinfo = NULL;
+ }
+ if (uclinux_ram_map.map_priv_1) {
+ iounmap((void *) uclinux_ram_map.virt);
+ uclinux_ram_map.virt = 0;
+ }
+}
+
+/****************************************************************************/
+
+module_init(uclinux_mtd_init);
+module_exit(uclinux_mtd_cleanup);
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Greg Ungerer <gerg@snapgear.com>");
+MODULE_DESCRIPTION("Generic RAM based MTD for uClinux");
+
+/****************************************************************************/
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