diff options
Diffstat (limited to 'linux-2.4.x/drivers/mtd/maps/ixp2000.c')
| -rw-r--r-- | linux-2.4.x/drivers/mtd/maps/ixp2000.c | 275 |
1 files changed, 275 insertions, 0 deletions
diff --git a/linux-2.4.x/drivers/mtd/maps/ixp2000.c b/linux-2.4.x/drivers/mtd/maps/ixp2000.c new file mode 100644 index 0000000..3749231 --- /dev/null +++ b/linux-2.4.x/drivers/mtd/maps/ixp2000.c @@ -0,0 +1,275 @@ +/* + * $Id: ixp2000.c,v 1.11 2005/11/29 20:01:28 gleixner Exp $ + * + * drivers/mtd/maps/ixp2000.c + * + * Mapping for the Intel XScale IXP2000 based systems + * + * Copyright (C) 2002 Intel Corp. + * Copyright (C) 2003-2004 MontaVista Software, Inc. + * + * Original Author: Naeem M Afzal <naeem.m.afzal@intel.com> + * Maintainer: Deepak Saxena <dsaxena@plexity.net> + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + * + */ + +#include <linux/module.h> +#include <linux/types.h> +#include <linux/init.h> +#include <linux/kernel.h> +#include <linux/string.h> +#include <linux/slab.h> +#include <linux/ioport.h> +#include <linux/device.h> +#include <linux/platform_device.h> + +#include <linux/mtd/mtd.h> +#include <linux/mtd/map.h> +#include <linux/mtd/partitions.h> + +#include <asm/io.h> +#include <asm/hardware.h> +#include <asm/mach/flash.h> + +#include <linux/reboot.h> + +struct ixp2000_flash_info { + struct mtd_info *mtd; + struct map_info map; + struct mtd_partition *partitions; + struct resource *res; + int nr_banks; +}; + +static inline unsigned long flash_bank_setup(struct map_info *map, unsigned long ofs) +{ + unsigned long (*set_bank)(unsigned long) = + (unsigned long(*)(unsigned long))map->map_priv_2; + + return (set_bank ? set_bank(ofs) : ofs); +} + +#ifdef __ARMEB__ +/* + * Rev A0 and A1 of IXP2400 silicon have a broken addressing unit which + * causes the lower address bits to be XORed with 0x11 on 8 bit accesses + * and XORed with 0x10 on 16 bit accesses. See the spec update, erratum 44. + */ +static int erratum44_workaround = 0; + +static inline unsigned long address_fix8_write(unsigned long addr) +{ + if (erratum44_workaround) { + return (addr ^ 3); + } + return addr; +} +#else + +#define address_fix8_write(x) (x) +#endif + +static map_word ixp2000_flash_read8(struct map_info *map, unsigned long ofs) +{ + map_word val; + + val.x[0] = *((u8 *)(map->map_priv_1 + flash_bank_setup(map, ofs))); + return val; +} + +/* + * We can't use the standard memcpy due to the broken SlowPort + * address translation on rev A0 and A1 silicon and the fact that + * we have banked flash. + */ +static void ixp2000_flash_copy_from(struct map_info *map, void *to, + unsigned long from, ssize_t len) +{ + from = flash_bank_setup(map, from); + while(len--) + *(__u8 *) to++ = *(__u8 *)(map->map_priv_1 + from++); +} + +static void ixp2000_flash_write8(struct map_info *map, map_word d, unsigned long ofs) +{ + *(__u8 *) (address_fix8_write(map->map_priv_1 + + flash_bank_setup(map, ofs))) = d.x[0]; +} + +static void ixp2000_flash_copy_to(struct map_info *map, unsigned long to, + const void *from, ssize_t len) +{ + to = flash_bank_setup(map, to); + while(len--) { + unsigned long tmp = address_fix8_write(map->map_priv_1 + to++); + *(__u8 *)(tmp) = *(__u8 *)(from++); + } +} + + +static int ixp2000_flash_remove(struct platform_device *dev) +{ + struct flash_platform_data *plat = dev->dev.platform_data; + struct ixp2000_flash_info *info = platform_get_drvdata(dev); + + platform_set_drvdata(dev, NULL); + + if(!info) + return 0; + + if (info->mtd) { + del_mtd_partitions(info->mtd); + map_destroy(info->mtd); + } + if (info->map.map_priv_1) + iounmap((void *) info->map.map_priv_1); + + kfree(info->partitions); + + if (info->res) { + release_resource(info->res); + kfree(info->res); + } + + if (plat->exit) + plat->exit(); + + return 0; +} + + +static int ixp2000_flash_probe(struct platform_device *dev) +{ + static const char *probes[] = { "RedBoot", "cmdlinepart", NULL }; + struct ixp2000_flash_data *ixp_data = dev->dev.platform_data; + struct flash_platform_data *plat; + struct ixp2000_flash_info *info; + unsigned long window_size; + int err = -1; + + if (!ixp_data) + return -ENODEV; + + plat = ixp_data->platform_data; + if (!plat) + return -ENODEV; + + window_size = dev->resource->end - dev->resource->start + 1; + dev_info(&dev->dev, "Probe of IXP2000 flash(%d banks x %dMiB)\n", + ixp_data->nr_banks, ((u32)window_size >> 20)); + + if (plat->width != 1) { + dev_err(&dev->dev, "IXP2000 MTD map only supports 8-bit mode, asking for %d\n", + plat->width * 8); + return -EIO; + } + + info = kmalloc(sizeof(struct ixp2000_flash_info), GFP_KERNEL); + if(!info) { + err = -ENOMEM; + goto Error; + } + memzero(info, sizeof(struct ixp2000_flash_info)); + + platform_set_drvdata(dev, info); + + /* + * Tell the MTD layer we're not 1:1 mapped so that it does + * not attempt to do a direct access on us. + */ + info->map.phys = NO_XIP; + + info->nr_banks = ixp_data->nr_banks; + info->map.size = ixp_data->nr_banks * window_size; + info->map.bankwidth = 1; + + /* + * map_priv_2 is used to store a ptr to to the bank_setup routine + */ + info->map.map_priv_2 = (unsigned long) ixp_data->bank_setup; + + info->map.name = dev->dev.bus_id; + info->map.read = ixp2000_flash_read8; + info->map.write = ixp2000_flash_write8; + info->map.copy_from = ixp2000_flash_copy_from; + info->map.copy_to = ixp2000_flash_copy_to; + + info->res = request_mem_region(dev->resource->start, + dev->resource->end - dev->resource->start + 1, + dev->dev.bus_id); + if (!info->res) { + dev_err(&dev->dev, "Could not reserve memory region\n"); + err = -ENOMEM; + goto Error; + } + + info->map.map_priv_1 = (unsigned long) ioremap(dev->resource->start, + dev->resource->end - dev->resource->start + 1); + if (!info->map.map_priv_1) { + dev_err(&dev->dev, "Failed to ioremap flash region\n"); + err = -EIO; + goto Error; + } + +#if defined(__ARMEB__) + /* + * Enable erratum 44 workaround for NPUs with broken slowport + */ + + erratum44_workaround = ixp2000_has_broken_slowport(); + dev_info(&dev->dev, "Erratum 44 workaround %s\n", + erratum44_workaround ? "enabled" : "disabled"); +#endif + + info->mtd = do_map_probe(plat->map_name, &info->map); + if (!info->mtd) { + dev_err(&dev->dev, "map_probe failed\n"); + err = -ENXIO; + goto Error; + } + info->mtd->owner = THIS_MODULE; + + err = parse_mtd_partitions(info->mtd, probes, &info->partitions, 0); + if (err > 0) { + err = add_mtd_partitions(info->mtd, info->partitions, err); + if(err) + dev_err(&dev->dev, "Could not parse partitions\n"); + } + + if (err) + goto Error; + + return 0; + +Error: + ixp2000_flash_remove(dev); + return err; +} + +static struct platform_driver ixp2000_flash_driver = { + .probe = ixp2000_flash_probe, + .remove = ixp2000_flash_remove, + .driver = { + .name = "IXP2000-Flash", + }, +}; + +static int __init ixp2000_flash_init(void) +{ + return platform_driver_register(&ixp2000_flash_driver); +} + +static void __exit ixp2000_flash_exit(void) +{ + platform_driver_unregister(&ixp2000_flash_driver); +} + +module_init(ixp2000_flash_init); +module_exit(ixp2000_flash_exit); +MODULE_LICENSE("GPL"); +MODULE_AUTHOR("Deepak Saxena <dsaxena@plexity.net>"); + |