1 files changed, 108 insertions, 0 deletions

diff --git a/drivers/mtd/maps/tsunami_flash.c b/drivers/mtd/maps/tsunami_flash.c
new file mode 100644
index 000000000000..170d71239e5e
--- /dev/null
+++ b/drivers/mtd/maps/tsunami_flash.c
@@ -0,0 +1,108 @@
+/*
+ * tsunami_flash.c
+ *
+ * flash chip on alpha ds10...
+ * $Id: tsunami_flash.c,v 1.9 2004/07/14 09:52:55 dwmw2 Exp $
+ */
+#include <asm/io.h>
+#include <asm/core_tsunami.h>
+#include <linux/init.h>
+#include <linux/mtd/map.h>
+#include <linux/mtd/mtd.h>
+
+#define FLASH_ENABLE_PORT 0x00C00001
+#define FLASH_ENABLE_BYTE 0x01
+#define FLASH_DISABLE_BYTE 0x00
+
+#define MAX_TIG_FLASH_SIZE (12*1024*1024)
+static inline map_word tsunami_flash_read8(struct map_info *map, unsigned long offset)
+{
+        map_word val;
+        val.x[0] = tsunami_tig_readb(offset);
+        return val;
+}
+
+static void tsunami_flash_write8(struct map_info *map, map_word value, unsigned long offset)
+{
+        tsunami_tig_writeb(value.x[0], offset);
+}
+
+static void tsunami_flash_copy_from(
+        struct map_info *map, void *addr, unsigned long offset, ssize_t len)
+{
+        unsigned char *dest;
+        dest = addr;
+        while(len && (offset < MAX_TIG_FLASH_SIZE)) {
+                *dest = tsunami_tig_readb(offset);
+                offset++;
+                dest++;
+                len--;
+        }
+}
+
+static void tsunami_flash_copy_to(
+        struct map_info *map, unsigned long offset, 
+        const void *addr, ssize_t len)
+{
+        const unsigned char *src;
+        src = addr;
+        while(len && (offset < MAX_TIG_FLASH_SIZE)) {
+                tsunami_tig_writeb(*src, offset);
+                offset++;
+                src++;
+                len--;
+        }
+}
+
+/*
+ * Deliberately don't provide operations wider than 8 bits.  I don't
+ * have then and it scares me to think how you could mess up if
+ * you tried to use them.   Buswidth is correctly so I'm safe.
+ */
+static struct map_info tsunami_flash_map = {
+        .name = "flash chip on the Tsunami TIG bus",
+        .size = MAX_TIG_FLASH_SIZE,
+        .phys = NO_XIP;
+        .bankwidth = 1,
+        .read = tsunami_flash_read8,
+        .copy_from = tsunami_flash_copy_from,
+        .write = tsunami_flash_write8,
+        .copy_to = tsunami_flash_copy_to,
+};
+
+static struct mtd_info *tsunami_flash_mtd;
+
+static void __exit  cleanup_tsunami_flash(void)
+{
+        struct mtd_info *mtd;
+        mtd = tsunami_flash_mtd;
+        if (mtd) {
+                del_mtd_device(mtd);
+                map_destroy(mtd);
+        }
+        tsunami_flash_mtd = 0;
+}
+
+
+static int __init init_tsunami_flash(void)
+{
+        static const char *rom_probe_types[] = { "cfi_probe", "jedec_probe", "map_rom", NULL };
+        char **type;
+
+        tsunami_tig_writeb(FLASH_ENABLE_BYTE, FLASH_ENABLE_PORT);
+        
+        tsunami_flash_mtd = 0;
+        type = rom_probe_types;
+        for(; !tsunami_flash_mtd && *type; type++) {
+                tsunami_flash_mtd = do_map_probe(*type, &tsunami_flash_map);
+        }
+        if (tsunami_flash_mtd) {
+                tsunami_flash_mtd->owner = THIS_MODULE;
+                add_mtd_device(tsunami_flash_mtd);
+                return 0;
+        }
+        return -ENXIO;
+}
+
+module_init(init_tsunami_flash);
+module_exit(cleanup_tsunami_flash);