--- /dev/null
+/*
+ * 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) 2008 John Crispin <blogic@openwrt.org>
+ */
+
+#include <linux/module.h>
+#include <linux/types.h>
+#include <linux/kernel.h>
+#include <linux/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 <linux/magic.h>
+#include <linux/platform_device.h>
+
+#include <ifxmips.h>
+#include <ifxmips_prom.h>
+#include <ifxmips_ebu.h>
+
+#ifndef CONFIG_MTD_PARTITIONS
+#error Please enable CONFIG_MTD_PARTITIONS
+#endif
+
+static struct map_info ifxmips_map = {
+ .name = "ifx-nor",
+ .bankwidth = 2,
+ .size = 0x400000,
+};
+
+static map_word ifxmips_read16(struct map_info *map, unsigned long adr)
+{
+ unsigned long flags;
+ map_word temp;
+ spin_lock_irqsave(&ebu_lock, flags);
+ adr ^= 2;
+ temp.x[0] = *((__u16 *)(map->virt + adr));
+ spin_unlock_irqrestore(&ebu_lock, flags);
+ return temp;
+}
+
+static void ifxmips_write16(struct map_info *map, map_word d, unsigned long adr)
+{
+ unsigned long flags;
+ spin_lock_irqsave(&ebu_lock, flags);
+ adr ^= 2;
+ *((__u16 *)(map->virt + adr)) = d.x[0];
+ spin_unlock_irqrestore(&ebu_lock, flags);
+}
+
+void ifxmips_copy_from(struct map_info *map, void *to, unsigned long from, ssize_t len)
+{
+ unsigned char *p;
+ unsigned char *to_8;
+ unsigned long flags;
+ spin_lock_irqsave(&ebu_lock, flags);
+ from = (unsigned long)(from + map->virt);
+ p = (unsigned char *) from;
+ to_8 = (unsigned char *) to;
+ while (len--)
+ *to_8++ = *p++;
+ spin_unlock_irqrestore(&ebu_lock, flags);
+}
+
+void ifxmips_copy_to(struct map_info *map,
+ unsigned long to,
+ const void *from,
+ ssize_t len)
+{
+ unsigned char *p = (unsigned char *)from;
+ unsigned char *to_8;
+ unsigned long flags;
+ spin_lock_irqsave(&ebu_lock, flags);
+ to += (unsigned long) map->virt;
+ to_8 = (unsigned char *)to;
+ while (len--)
+ *p++ = *to_8++;
+ spin_unlock_irqrestore(&ebu_lock, flags);
+}
+
+static struct mtd_partition ifxmips_partitions[] = {
+ {
+ .name = "uboot",
+ .offset = 0x00000000,
+ .size = 0x00020000,
+ },
+ {
+ .name = "uboot_env",
+ .offset = 0x00020000,
+ .size = 0x0,
+ },
+ {
+ .name = "kernel",
+ .offset = 0x0,
+ .size = 0x0,
+ },
+ {
+ .name = "rootfs",
+ .offset = 0x0,
+ .size = 0x0,
+ },
+ {
+ .name = "board_config",
+ .offset = 0x0,
+ .size = 0x0,
+ },
+};
+
+static struct mtd_partition ifxmips_meta_partition = {
+ .name = "linux",
+ .offset = 0x00030000,
+ .size = 0x0,
+};
+
+static const char *part_probe_types[] = { "cmdlinepart", NULL };
+
+int find_uImage_size(unsigned long start_offset)
+{
+ unsigned long magic;
+ unsigned long temp;
+ ifxmips_copy_from(&ifxmips_map, &magic, start_offset, 4);
+ if (le32_to_cpu(magic) != 0x56190527) {
+ printk(KERN_INFO "ifxmips_mtd: invalid magic (0x%08X) of kernel at 0x%08lx \n", le32_to_cpu(magic), start_offset);
+ return 0;
+ }
+ ifxmips_copy_from(&ifxmips_map, &temp, start_offset + 12, 4);
+ printk(KERN_INFO "ifxmips_mtd: kernel size is %ld \n", temp + 0x40);
+ return temp + 0x40;
+}
+
+int find_brn_block(unsigned long start_offset)
+{
+ unsigned char temp[9];
+ ifxmips_copy_from(&ifxmips_map, &temp, start_offset, 8);
+ temp[8] = '\0';
+ printk(KERN_INFO "data in brn block %s\n", temp);
+ if (memcmp(temp, "BRN-BOOT", 8) == 0)
+ return 1;
+ else
+ return 0;
+}
+
+int detect_squashfs_partition(unsigned long start_offset)
+{
+ unsigned long temp;
+ ifxmips_copy_from(&ifxmips_map, &temp, start_offset, 4);
+ return le32_to_cpu(temp) == SQUASHFS_MAGIC;
+}
+
+static int ifxmips_mtd_probe(struct platform_device *dev)
+{
+ struct mtd_info *ifxmips_mtd = NULL;
+ struct mtd_partition *parts = NULL;
+ unsigned long uimage_size;
+ int err, i;
+ int kernel_part = 2, rootfs_part = 3;
+ int num_parts = ARRAY_SIZE(ifxmips_partitions);
+
+ ifxmips_w32(0x1d7ff, IFXMIPS_EBU_BUSCON0);
+
+ ifxmips_map.read = ifxmips_read16;
+ ifxmips_map.write = ifxmips_write16;
+ ifxmips_map.copy_from = ifxmips_copy_from;
+ ifxmips_map.copy_to = ifxmips_copy_to;
+ ifxmips_map.phys = dev->resource->start;
+ ifxmips_map.size = dev->resource->end - ifxmips_map.phys + 1;
+ ifxmips_map.virt = ioremap_nocache(ifxmips_map.phys, ifxmips_map.size);
+
+ if (!ifxmips_map.virt) {
+ printk(KERN_WARNING "ifxmips_mtd: failed to ioremap!\n");
+ return -EIO;
+ }
+
+ ifxmips_mtd = (struct mtd_info *) do_map_probe("cfi_probe", &ifxmips_map);
+ if (!ifxmips_mtd) {
+ iounmap(ifxmips_map.virt);
+ printk(KERN_WARNING "ifxmips_mtd: probing failed\n");
+ return -ENXIO;
+ }
+
+ ifxmips_mtd->owner = THIS_MODULE;
+
+ err = parse_mtd_partitions(ifxmips_mtd, part_probe_types, &parts, 0);
+ if (err > 0) {
+ printk(KERN_INFO "ifxmips_mtd: found %d partitions from cmdline\n", err);
+ num_parts = err;
+ kernel_part = 0;
+ rootfs_part = 0;
+ for (i = 0; i < num_parts; i++) {
+ if (strcmp(parts[i].name, "kernel") == 0)
+ kernel_part = i;
+ if (strcmp(parts[i].name, "rootfs") == 0)
+ rootfs_part = i;
+ }
+ } else {
+ /* if the flash is 64k sectors, the kernel will reside at 0xb0030000
+ if the flash is 128k sectors, the kernel will reside at 0xb0040000 */
+ ifxmips_partitions[1].size = ifxmips_mtd->erasesize;
+ ifxmips_partitions[2].offset = ifxmips_partitions[1].offset + ifxmips_mtd->erasesize;
+ parts = &ifxmips_partitions[0];
+ }
+
+ /* dynamic size detection only if rootfs-part follows kernel-part */
+ if (kernel_part+1 == rootfs_part) {
+ uimage_size = find_uImage_size(parts[kernel_part].offset);
+
+ if (detect_squashfs_partition(parts[kernel_part].offset + uimage_size)) {
+ printk(KERN_INFO "ifxmips_mtd: found a squashfs following the uImage\n");
+ } else {
+ uimage_size &= ~(ifxmips_mtd->erasesize -1);
+ uimage_size += ifxmips_mtd->erasesize;
+ }
+
+ parts[kernel_part].size = uimage_size;
+ parts[rootfs_part].offset = parts[kernel_part].offset + parts[kernel_part].size;
+ parts[rootfs_part].size = ((ifxmips_mtd->size >> 20) * 1024 * 1024) - parts[rootfs_part].offset;
+
+ ifxmips_meta_partition.offset = parts[kernel_part].offset;
+ ifxmips_meta_partition.size = parts[kernel_part].size + parts[rootfs_part].size;
+ }
+
+ if (err <= 0) {
+ if (ifxmips_has_brn_block()) {
+ parts[3].size -= ifxmips_mtd->erasesize;
+ parts[4].offset = ifxmips_mtd->size - ifxmips_mtd->erasesize;
+ parts[4].size = ifxmips_mtd->erasesize;
+ ifxmips_meta_partition.size -= ifxmips_mtd->erasesize;
+ } else {
+ num_parts--;
+ }
+ }
+
+ add_mtd_partitions(ifxmips_mtd, parts, num_parts);
+ add_mtd_partitions(ifxmips_mtd, &ifxmips_meta_partition, 1);
+
+ printk(KERN_INFO "ifxmips_mtd: added %s flash with %dMB\n",
+ ifxmips_map.name, ((int)ifxmips_mtd->size) >> 20);
+ return 0;
+}
+
+static struct platform_driver ifxmips_mtd_driver = {
+ .probe = ifxmips_mtd_probe,
+ .driver = {
+ .name = "ifxmips_mtd",
+ .owner = THIS_MODULE,
+ },
+};
+
+int __init init_ifxmips_mtd(void)
+{
+ int ret = platform_driver_register(&ifxmips_mtd_driver);
+ if (ret)
+ printk(KERN_INFO "ifxmips_mtd: error registering platfom driver!");
+ return ret;
+}
+
+static void __exit cleanup_ifxmips_mtd(void)
+{
+ platform_driver_unregister(&ifxmips_mtd_driver);
+}
+
+module_init(init_ifxmips_mtd);
+module_exit(cleanup_ifxmips_mtd);
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("John Crispin <blogic@openwrt.org>");
+MODULE_DESCRIPTION("MTD map driver for IFXMIPS boards");
projects / openwrt.git / blobdiff