diff options
Diffstat (limited to 'drivers/mtd/maps/autcpu12-nvram.c')
| -rw-r--r-- | drivers/mtd/maps/autcpu12-nvram.c | 127 |
1 files changed, 127 insertions, 0 deletions
diff --git a/drivers/mtd/maps/autcpu12-nvram.c b/drivers/mtd/maps/autcpu12-nvram.c new file mode 100644 index 00000000000..cf362ccc3c8 --- /dev/null +++ b/drivers/mtd/maps/autcpu12-nvram.c @@ -0,0 +1,127 @@ +/* + * NV-RAM memory access on autcpu12 + * (C) 2002 Thomas Gleixner (gleixner@autronix.de) + * + * $Id: autcpu12-nvram.c,v 1.8 2004/11/04 13:24:14 gleixner Exp $ + * + * 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 + * + */ + +#include <linux/module.h> +#include <linux/types.h> +#include <linux/kernel.h> +#include <linux/ioport.h> +#include <linux/init.h> +#include <asm/io.h> +#include <asm/sizes.h> +#include <asm/hardware.h> +#include <asm/arch/autcpu12.h> +#include <linux/mtd/mtd.h> +#include <linux/mtd/map.h> +#include <linux/mtd/partitions.h> + + +static struct mtd_info *sram_mtd; + +struct map_info autcpu12_sram_map = { + .name = "SRAM", + .size = 32768, + .bankwidth = 4, + .phys = 0x12000000, +}; + +static int __init init_autcpu12_sram (void) +{ + int err, save0, save1; + + autcpu12_sram_map.virt = ioremap(0x12000000, SZ_128K); + if (!autcpu12_sram_map.virt) { + printk("Failed to ioremap autcpu12 NV-RAM space\n"); + err = -EIO; + goto out; + } + simple_map_init(&autcpu_sram_map); + + /* + * Check for 32K/128K + * read ofs 0 + * read ofs 0x10000 + * Write complement to ofs 0x100000 + * Read and check result on ofs 0x0 + * Restore contents + */ + save0 = map_read32(&autcpu12_sram_map,0); + save1 = map_read32(&autcpu12_sram_map,0x10000); + map_write32(&autcpu12_sram_map,~save0,0x10000); + /* if we find this pattern on 0x0, we have 32K size + * restore contents and exit + */ + if ( map_read32(&autcpu12_sram_map,0) != save0) { + map_write32(&autcpu12_sram_map,save0,0x0); + goto map; + } + /* We have a 128K found, restore 0x10000 and set size + * to 128K + */ + map_write32(&autcpu12_sram_map,save1,0x10000); + autcpu12_sram_map.size = SZ_128K; + +map: + sram_mtd = do_map_probe("map_ram", &autcpu12_sram_map); + if (!sram_mtd) { + printk("NV-RAM probe failed\n"); + err = -ENXIO; + goto out_ioremap; + } + + sram_mtd->owner = THIS_MODULE; + sram_mtd->erasesize = 16; + + if (add_mtd_device(sram_mtd)) { + printk("NV-RAM device addition failed\n"); + err = -ENOMEM; + goto out_probe; + } + + printk("NV-RAM device size %ldKiB registered on AUTCPU12\n",autcpu12_sram_map.size/SZ_1K); + + return 0; + +out_probe: + map_destroy(sram_mtd); + sram_mtd = 0; + +out_ioremap: + iounmap((void *)autcpu12_sram_map.virt); +out: + return err; +} + +static void __exit cleanup_autcpu12_maps(void) +{ + if (sram_mtd) { + del_mtd_device(sram_mtd); + map_destroy(sram_mtd); + iounmap((void *)autcpu12_sram_map.virt); + } +} + +module_init(init_autcpu12_sram); +module_exit(cleanup_autcpu12_maps); + +MODULE_AUTHOR("Thomas Gleixner"); +MODULE_DESCRIPTION("autcpu12 NV-RAM map driver"); +MODULE_LICENSE("GPL"); |