1 files changed, 127 insertions, 0 deletions

diff --git a/drivers/mtd/maps/autcpu12-nvram.c b/drivers/mtd/maps/autcpu12-nvram.c
new file mode 100644
index 000000000000..cf362ccc3c8e
--- /dev/null
+++ b/drivers/mtd/maps/autcpu12-nvram.c
@@ -0,0 +1,127 @@
+/*
+ * NV-RAM memory access on autcpu12 
+ * (C) 2002 Thomas Gleixner (gleixner@autronix.de)
+ *
+ * $Id: autcpu12-nvram.c,v 1.8 2004/11/04 13:24:14 gleixner Exp $ 
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ *
+ */
+
+#include <linux/module.h>
+#include <linux/types.h>
+#include <linux/kernel.h>
+#include <linux/ioport.h>
+#include <linux/init.h>
+#include <asm/io.h>
+#include <asm/sizes.h>
+#include <asm/hardware.h>
+#include <asm/arch/autcpu12.h>
+#include <linux/mtd/mtd.h>
+#include <linux/mtd/map.h>
+#include <linux/mtd/partitions.h>
+
+
+static struct mtd_info *sram_mtd;
+
+struct map_info autcpu12_sram_map = {
+        .name = "SRAM",
+        .size = 32768,
+        .bankwidth = 4,
+        .phys = 0x12000000,
+};
+
+static int __init init_autcpu12_sram (void)
+{
+        int err, save0, save1;
+
+        autcpu12_sram_map.virt = ioremap(0x12000000, SZ_128K);
+        if (!autcpu12_sram_map.virt) {
+                printk("Failed to ioremap autcpu12 NV-RAM space\n");
+                err = -EIO;
+                goto out;
+        }
+        simple_map_init(&autcpu_sram_map);
+
+        /* 
+         * Check for 32K/128K 
+         * read ofs 0 
+         * read ofs 0x10000 
+         * Write complement to ofs 0x100000
+         * Read and check result on ofs 0x0
+         * Restore contents
+         */
+        save0 = map_read32(&autcpu12_sram_map,0);
+        save1 = map_read32(&autcpu12_sram_map,0x10000);
+        map_write32(&autcpu12_sram_map,~save0,0x10000);
+        /* if we find this pattern on 0x0, we have 32K size 
+         * restore contents and exit
+         */
+        if ( map_read32(&autcpu12_sram_map,0) != save0) {
+                map_write32(&autcpu12_sram_map,save0,0x0);
+                goto map;
+        }
+        /* We have a 128K found, restore 0x10000 and set size
+         * to 128K
+         */
+        map_write32(&autcpu12_sram_map,save1,0x10000);
+        autcpu12_sram_map.size = SZ_128K;
+
+map:
+        sram_mtd = do_map_probe("map_ram", &autcpu12_sram_map);
+        if (!sram_mtd) {
+                printk("NV-RAM probe failed\n");
+                err = -ENXIO;
+                goto out_ioremap;
+        }
+
+        sram_mtd->owner = THIS_MODULE;
+        sram_mtd->erasesize = 16;
+        
+        if (add_mtd_device(sram_mtd)) {
+                printk("NV-RAM device addition failed\n");
+                err = -ENOMEM;
+                goto out_probe;
+        }
+
+        printk("NV-RAM device size %ldKiB registered on AUTCPU12\n",autcpu12_sram_map.size/SZ_1K);
+                
+        return 0;
+
+out_probe:
+        map_destroy(sram_mtd);
+        sram_mtd = 0;
+
+out_ioremap:
+        iounmap((void *)autcpu12_sram_map.virt);
+out:
+        return err;
+}
+
+static void __exit cleanup_autcpu12_maps(void)
+{
+        if (sram_mtd) {
+                del_mtd_device(sram_mtd);
+                map_destroy(sram_mtd);
+                iounmap((void *)autcpu12_sram_map.virt);
+        }
+}
+
+module_init(init_autcpu12_sram);
+module_exit(cleanup_autcpu12_maps);
+
+MODULE_AUTHOR("Thomas Gleixner");
+MODULE_DESCRIPTION("autcpu12 NV-RAM map driver");
+MODULE_LICENSE("GPL");