initial merge of danube, pci is still broken and the new dma code still needs to...

[openwrt.git] / target / linux / danube / files / drivers / mtd / maps / danube.c

diff --git a/target/linux/danube/files/drivers/mtd/maps/danube.c b/target/linux/danube/files/drivers/mtd/maps/danube.c
new file mode 100644 (file)
index 0000000..25e9df3
--- /dev/null
+++ b/target/linux/danube/files/drivers/mtd/maps/danube.c
@@ -0,0 +1,194 @@
+/*
+ *  Driver for DANUBE flashmap 
+ *
+ * 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
+ *
+ * Copyright (C) 2004 Liu Peng Infineon IFAP DC COM CPE
+ * Copyright (C) 2007 John Crispin <blogic@openwrt.org>
+ */
+
+#include <linux/module.h>
+#include <linux/types.h>
+#include <linux/kernel.h>
+#include <asm/io.h>
+
+#include <linux/init.h>
+#include <linux/mtd/mtd.h>
+#include <linux/mtd/map.h>
+#include <linux/mtd/partitions.h>
+#include <linux/mtd/cfi.h>
+#include <asm/danube/danube.h>
+#include <linux/magic.h>
+
+static struct map_info
+danube_map = {
+       .name = "DANUBE_FLASH",
+       .bankwidth = 2,
+       .size = 0x400000,
+};
+
+static map_word
+danube_read16 (struct map_info * map, unsigned long adr)
+{
+       map_word temp;
+
+       adr ^= 2;
+       temp.x[0] = *((__u16 *) (map->virt + adr));
+
+       return temp;
+}
+
+static void
+danube_write16 (struct map_info *map, map_word d, unsigned long adr)
+{
+       adr ^= 2;
+       *((__u16 *) (map->virt + adr)) = d.x[0];
+}
+
+void
+danube_copy_from (struct map_info *map, void *to, unsigned long from, ssize_t len)
+{
+       u8 *p;
+       u8 *to_8;
+
+       from = (unsigned long) (from + map->virt);
+       p = (u8 *) from;
+       to_8 = (u8 *) to;
+       while(len--){
+               *to_8++ = *p++;
+       }
+}
+
+void
+danube_copy_to (struct map_info *map, unsigned long to, const void *from, ssize_t len)
+{
+       u8 *p =  (u8*) from;
+       u8 *to_8;
+
+       to += (unsigned long) map->virt;
+       to_8 = (u8*)to;
+       while(len--){
+               *p++ = *to_8++;
+       }
+}
+
+static struct mtd_partition
+danube_partitions[4] = {
+       {
+               name:"U-Boot",
+               offset:0x00000000,
+               size:0x00020000,
+       },
+       {
+               name:"U-Boot-Env",
+               offset:0x00020000,
+               size:0x00010000,
+       },
+       {
+               name:"kernel",
+               offset:0x00030000,
+               size:0x0,
+       },
+       {
+               name:"rootfs",
+               offset:0x0,
+               size:0x0,
+       },
+};
+
+#define DANUBE_FLASH_START             0x10000000
+#define DANUBE_FLASH_MAX               0x2000000
+
+int
+find_uImage_size (unsigned long start_offset){
+       unsigned long temp;
+
+       danube_copy_from(&danube_map, &temp, start_offset + 12, 4);
+       printk("kernel size is %ld \n", temp + 0x40);
+       return temp + 0x40;
+}
+
+int
+detect_squashfs_partition (unsigned long start_offset){
+       unsigned long temp;
+
+       danube_copy_from(&danube_map, &temp, start_offset, 4);
+
+       return (temp == SQUASHFS_MAGIC);
+}
+
+int __init
+init_danube_mtd (void)
+{
+       struct mtd_info *danube_mtd = NULL;
+       struct mtd_partition *parts = NULL;
+       unsigned long uimage_size;
+
+       writel(0x1d7ff, DANUBE_EBU_BUSCON0);
+
+       danube_map.read = danube_read16;
+       danube_map.write = danube_write16;
+       danube_map.copy_from = danube_copy_from;
+       danube_map.copy_to = danube_copy_to;
+
+       danube_map.phys = DANUBE_FLASH_START;
+       danube_map.virt = ioremap_nocache(DANUBE_FLASH_START, DANUBE_FLASH_MAX);
+       danube_map.size = DANUBE_FLASH_MAX;
+       if (!danube_map.virt) {
+               printk(KERN_WARNING "Failed to ioremap!\n");
+               return -EIO;
+       }
+
+       danube_mtd = (struct mtd_info *) do_map_probe("cfi_probe", &danube_map);
+       if (!danube_mtd) {
+               iounmap(danube_map.virt);
+               printk("probing failed\n");
+               return -ENXIO;
+       }
+
+       danube_mtd->owner = THIS_MODULE;
+
+       uimage_size = find_uImage_size(danube_partitions[2].offset);
+
+       if(detect_squashfs_partition(danube_partitions[2].offset + uimage_size)){
+               printk("Found a squashfs following the uImage\n");
+       } else {
+               uimage_size &= ~0xffff;
+               uimage_size += 0x10000;
+       }
+
+       danube_partitions[2].size = uimage_size;
+       danube_partitions[3].offset = danube_partitions[2].offset + danube_partitions[2].size;
+       danube_partitions[3].size = ((danube_mtd->size >> 20) * 1024 * 1024) - danube_partitions[3].offset;
+
+       parts = &danube_partitions[0];
+       add_mtd_partitions(danube_mtd, parts, 4);
+
+       printk("Added danube flash with %dMB\n", danube_mtd->size >> 20);
+       return 0;
+}
+
+static void
+__exit
+cleanup_danube_mtd (void)
+{
+}
+
+module_init (init_danube_mtd);
+module_exit (cleanup_danube_mtd);
+
+MODULE_LICENSE ("GPL");
+MODULE_AUTHOR ("John Crispin <blogic@openwrt.org>");
+MODULE_DESCRIPTION ("MTD map driver for DANUBE boards");