1 files changed, 122 insertions, 0 deletions

diff --git a/drivers/mtd/maps/walnut.c b/drivers/mtd/maps/walnut.c
new file mode 100644
index 000000000000..d6137b1b5670
--- /dev/null
+++ b/drivers/mtd/maps/walnut.c
@@ -0,0 +1,122 @@
+/*
+ * $Id: walnut.c,v 1.2 2004/12/10 12:07:42 holindho Exp $
+ * 
+ * Mapping for Walnut flash
+ * (used ebony.c as a "framework")
+ * 
+ * Heikki Lindholm <holindho@infradead.org>
+ * 
+ * 
+ * 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.
+ */
+
+#include <linux/module.h>
+#include <linux/types.h>
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/mtd/mtd.h>
+#include <linux/mtd/map.h>
+#include <linux/mtd/partitions.h>
+#include <linux/config.h>
+#include <linux/version.h>
+#include <asm/io.h>
+#include <asm/ibm4xx.h>
+#include <platforms/4xx/walnut.h>
+
+/* these should be in platforms/4xx/walnut.h ? */
+#define WALNUT_FLASH_ONBD_N(x)          (x & 0x02)
+#define WALNUT_FLASH_SRAM_SEL(x)        (x & 0x01)
+#define WALNUT_FLASH_LOW                0xFFF00000
+#define WALNUT_FLASH_HIGH               0xFFF80000
+#define WALNUT_FLASH_SIZE               0x80000
+
+static struct mtd_info *flash;
+
+static struct map_info walnut_map = {
+        .name =         "Walnut flash",
+        .size =         WALNUT_FLASH_SIZE,
+        .bankwidth =    1,
+};
+
+/* Actually, OpenBIOS is the last 128 KiB of the flash - better
+ * partitioning could be made */
+static struct mtd_partition walnut_partitions[] = {
+        {
+                .name =   "OpenBIOS",
+                .offset = 0x0,
+                .size =   WALNUT_FLASH_SIZE,
+                /*.mask_flags = MTD_WRITEABLE, */ /* force read-only */         
+        }
+};
+
+int __init init_walnut(void)
+{
+        u8 fpga_brds1;
+        void *fpga_brds1_adr;
+        void *fpga_status_adr;
+        unsigned long flash_base;
+
+        /* this should already be mapped (platform/4xx/walnut.c) */
+        fpga_status_adr = ioremap(WALNUT_FPGA_BASE, 8);
+        if (!fpga_status_adr)
+                return -ENOMEM;
+
+        fpga_brds1_adr = fpga_status_adr+5;
+        fpga_brds1 = readb(fpga_brds1_adr);
+        /* iounmap(fpga_status_adr); */
+
+        if (WALNUT_FLASH_ONBD_N(fpga_brds1)) {
+                printk("The on-board flash is disabled (U79 sw 5)!");
+                return -EIO;
+        }
+        if (WALNUT_FLASH_SRAM_SEL(fpga_brds1)) 
+                flash_base = WALNUT_FLASH_LOW;
+        else
+                flash_base = WALNUT_FLASH_HIGH;
+        
+        walnut_map.phys = flash_base;
+        walnut_map.virt =
+                (void __iomem *)ioremap(flash_base, walnut_map.size);
+
+        if (!walnut_map.virt) {
+                printk("Failed to ioremap flash.\n");
+                return -EIO;
+        }
+
+        simple_map_init(&walnut_map);
+
+        flash = do_map_probe("jedec_probe", &walnut_map);
+        if (flash) {
+                flash->owner = THIS_MODULE;
+                add_mtd_partitions(flash, walnut_partitions,
+                                        ARRAY_SIZE(walnut_partitions));
+        } else {
+                printk("map probe failed for flash\n");
+                return -ENXIO;
+        }
+
+        return 0;
+}
+
+static void __exit cleanup_walnut(void)
+{
+        if (flash) {
+                del_mtd_partitions(flash);
+                map_destroy(flash);
+        }
+
+        if (walnut_map.virt) {
+                iounmap((void *)walnut_map.virt);
+                walnut_map.virt = 0;
+        }
+}
+
+module_init(init_walnut);
+module_exit(cleanup_walnut);
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Heikki Lindholm <holindho@infradead.org>");
+MODULE_DESCRIPTION("MTD map and partitions for IBM 405GP Walnut boards");