1 files changed, 187 insertions, 0 deletions

diff --git a/drivers/mtd/maps/db1550-flash.c b/drivers/mtd/maps/db1550-flash.c
new file mode 100644
index 000000000000..d213888462a4
--- /dev/null
+++ b/drivers/mtd/maps/db1550-flash.c
@@ -0,0 +1,187 @@
+/*
+ * Flash memory access on Alchemy Db1550 board
+ * 
+ * $Id: db1550-flash.c,v 1.7 2004/11/04 13:24:14 gleixner Exp $
+ *
+ * (C) 2004 Embedded Edge, LLC, based on db1550-flash.c:
+ * (C) 2003, 2004 Pete Popov <ppopov@embeddedalley.com>
+ * 
+ */
+
+#include <linux/config.h>
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/types.h>
+#include <linux/kernel.h>
+
+#include <linux/mtd/mtd.h>
+#include <linux/mtd/map.h>
+#include <linux/mtd/partitions.h>
+
+#include <asm/io.h>
+
+#ifdef  DEBUG_RW
+#define DBG(x...)       printk(x)
+#else
+#define DBG(x...)       
+#endif
+
+static unsigned long window_addr;
+static unsigned long window_size;
+
+
+static struct map_info db1550_map = {
+        .name = "Db1550 flash",
+};
+
+static unsigned char flash_bankwidth = 4;
+
+/* 
+ * Support only 64MB NOR Flash parts
+ */
+
+#if defined(CONFIG_MTD_DB1550_BOOT) && defined(CONFIG_MTD_DB1550_USER)
+#define DB1550_BOTH_BANKS
+#elif defined(CONFIG_MTD_DB1550_BOOT) && !defined(CONFIG_MTD_DB1550_USER)
+#define DB1550_BOOT_ONLY
+#elif !defined(CONFIG_MTD_DB1550_BOOT) && defined(CONFIG_MTD_DB1550_USER)
+#define DB1550_USER_ONLY
+#endif
+
+#ifdef DB1550_BOTH_BANKS
+/* both banks will be used. Combine the first bank and the first 
+ * part of the second bank together into a single jffs/jffs2
+ * partition.
+ */
+static struct mtd_partition db1550_partitions[] = {
+        /* assume boot[2:0]:swap is '0000' or '1000', which translates to:
+         * 1C00 0000 1FFF FFFF CE0 64MB Boot NOR Flash
+         * 1800 0000 1BFF FFFF CE0 64MB Param NOR Flash
+         */
+        {
+                .name = "User FS",
+                .size =   (0x1FC00000 - 0x18000000),
+                .offset = 0x0000000
+        },{
+                .name = "yamon",
+                .size = 0x0100000,
+                .offset = MTDPART_OFS_APPEND,
+                .mask_flags = MTD_WRITEABLE
+        },{
+                .name = "raw kernel",
+                .size = (0x300000 - 0x40000), /* last 256KB is yamon env */
+                .offset = MTDPART_OFS_APPEND,
+        }
+};
+#elif defined(DB1550_BOOT_ONLY)
+static struct mtd_partition db1550_partitions[] = {
+        /* assume boot[2:0]:swap is '0000' or '1000', which translates to:
+         * 1C00 0000 1FFF FFFF CE0 64MB Boot NOR Flash
+         */
+        {
+                .name = "User FS",
+                .size =   0x03c00000,
+                .offset = 0x0000000
+        },{
+                .name = "yamon",
+                .size = 0x0100000,
+                .offset = MTDPART_OFS_APPEND,
+                .mask_flags = MTD_WRITEABLE
+        },{
+                .name = "raw kernel",
+                .size = (0x300000-0x40000), /* last 256KB is yamon env */
+                .offset = MTDPART_OFS_APPEND,
+        }
+};
+#elif defined(DB1550_USER_ONLY)
+static struct mtd_partition db1550_partitions[] = {
+        /* assume boot[2:0]:swap is '0000' or '1000', which translates to:
+         * 1800 0000 1BFF FFFF CE0 64MB Param NOR Flash
+         */
+        {
+                .name = "User FS",
+                .size = (0x4000000 - 0x200000), /* reserve 2MB for raw kernel */
+                .offset = 0x0000000
+        },{
+                .name = "raw kernel",
+                .size = MTDPART_SIZ_FULL,
+                .offset = MTDPART_OFS_APPEND,
+        }
+};
+#else
+#error MTD_DB1550 define combo error /* should never happen */
+#endif
+
+#define NB_OF(x)  (sizeof(x)/sizeof(x[0]))
+
+static struct mtd_info *mymtd;
+
+/*
+ * Probe the flash density and setup window address and size
+ * based on user CONFIG options. There are times when we don't
+ * want the MTD driver to be probing the boot or user flash,
+ * so having the option to enable only one bank is important.
+ */
+int setup_flash_params(void)
+{
+#if defined(DB1550_BOTH_BANKS)
+                        window_addr = 0x18000000;
+                        window_size = 0x8000000; 
+#elif defined(DB1550_BOOT_ONLY)
+                        window_addr = 0x1C000000;
+                        window_size = 0x4000000; 
+#else /* USER ONLY */
+                        window_addr = 0x18000000;
+                        window_size = 0x4000000; 
+#endif
+        return 0;
+}
+
+int __init db1550_mtd_init(void)
+{
+        struct mtd_partition *parts;
+        int nb_parts = 0;
+        
+        /* Default flash bankwidth */
+        db1550_map.bankwidth = flash_bankwidth;
+
+        if (setup_flash_params()) 
+                return -ENXIO;
+
+        /*
+         * Static partition definition selection
+         */
+        parts = db1550_partitions;
+        nb_parts = NB_OF(db1550_partitions);
+        db1550_map.size = window_size;
+
+        /*
+         * Now let's probe for the actual flash.  Do it here since
+         * specific machine settings might have been set above.
+         */
+        printk(KERN_NOTICE "Db1550 flash: probing %d-bit flash bus\n", 
+                        db1550_map.bankwidth*8);
+        db1550_map.virt = ioremap(window_addr, window_size);
+        mymtd = do_map_probe("cfi_probe", &db1550_map);
+        if (!mymtd) return -ENXIO;
+        mymtd->owner = THIS_MODULE;
+
+        add_mtd_partitions(mymtd, parts, nb_parts);
+        return 0;
+}
+
+static void __exit db1550_mtd_cleanup(void)
+{
+        if (mymtd) {
+                del_mtd_partitions(mymtd);
+                map_destroy(mymtd);
+                iounmap((void *) db1550_map.virt);
+        }
+}
+
+module_init(db1550_mtd_init);
+module_exit(db1550_mtd_cleanup);
+
+MODULE_AUTHOR("Embedded Edge, LLC");
+MODULE_DESCRIPTION("Db1550 mtd map driver");
+MODULE_LICENSE("GPL");