| #include?<linux/module.h>
#include?<linux/types.h>
#include?<linux/kernel.h>
#include?<linux/init.h>
#include?<asm/io.h>
#include?<linux/mtd/mtd.h>
#include?<linux/mtd/map.h>
#ifdef?CONFIG_MTD_PARTITIONS
#include?<linux/mtd/partitions.h>
#endif
#define?WINDOW_ADDR?0x10000000?/*?physical?properties?of?flash?*/
#define?WINDOW_SIZE?0x00800000?/*?intel?28F640J3A?8MB?*/
#define?BUSWIDTH?2?/*?data?bus?width?16bits?*/
/*?can?be?"cfi_probe",?"jedec_probe",?"map_rom",?NULL?};?*/
#define?PROBETYPES?{?"cfi_probe",?NULL?}
#define?MSG_PREFIX?"AT91RM9200-NOR:"?/*?prefix?for?our?printk()'s?*/
#define?MTDID?"at91rm9200-%d"?/*?for?mtdparts=?partitioning?*/
static?struct?mtd_info?*mymtd;
struct?map_info?at91rm9200nor_map?=?{
????????.name?=?"NOR?flash?on?AT91RM9200DK",
????????.size?=?WINDOW_SIZE,
????????.bankwidth?=?BUSWIDTH,
????????.phys?=?WINDOW_ADDR,
};
#ifdef?CONFIG_MTD_PARTITIONS
/*
?*?MTD?partitioning?stuff
?*/
static?struct?mtd_partition?at91rm9200nor_partitions[5]?=
{
????????{
????????????????//?U-boot?128KB
????????????????.name?=?"U-boot",
????????????????.size?=?0x20000,
????????????????.offset?=?0
????????},
????????{
????????????????//?uImage?2MB
????????????????.name?=?"Kernel",
????????????????.size?=?0x200000,
????????????????.offset?=?0x20000
????????},
????????{
????????????????//?RootFS?3MB
????????????????.name?=?"RootFS",
????????????????.size?=?0x300000,
????????????????.offset?=?0x220000
????????},
????????{
????????????????//?UserFS
????????????????.name?=?"Jffs2",
????????????????.size?=?0x2C0000,
????????????????.offset?=?0x520000
????????},
????????{
????????????????//?Parameters
????????????????.name?=?"Parameters",
????????????????.offset?=?0x7E0000
????????},
};
static?const?char?*probes[]?=?{?NULL?};
#endif
static?int?mtd_parts_nb?=?0;
static?struct?mtd_partition?*mtd_parts?=?0;
int?__init?init_at91rm9200nor(void)
{
????????static?const?char?*rom_probe_types[]?=?PROBETYPES;
????????const?char?**type;
????????const?char?*part_type?=?0;
????????printk(KERN_NOTICE?MSG_PREFIX?"0x%08x?at?0x%08xn",
???????????????WINDOW_SIZE,?WINDOW_ADDR);
????????at91rm9200nor_map.virt?=?ioremap(WINDOW_ADDR,?WINDOW_SIZE);
????????if?(!at91rm9200nor_map.virt)?{
????????????????printk(MSG_PREFIX?"failed?to?ioremapn");
????????????????return?-EIO;
????????}
????????simple_map_init(&at91rm9200nor_map);
????????mymtd?=?0;
????????type?=?rom_probe_types;
????????for(;?!mymtd?&&?*type;?type++)?{
????????????????mymtd?=?do_map_probe(*type,?&at91rm9200nor_map);
????????}
????????if?(mymtd)?{
????????????????mymtd->owner?=?THIS_MODULE;
#ifdef?CONFIG_MTD_PARTITIONS
????????????????mtd_parts_nb?=?parse_mtd_partitions(mymtd,?probes,?&mtd_parts,?0);
????????????????if?(mtd_parts_nb?>?0)
??????????????????part_type?=?"detected";
????????????????if?(mtd_parts_nb?==?0)
????????????????{
????????????????????????mtd_parts?=?at91rm9200nor_partitions;
????????????????????????mtd_parts_nb?=?ARRAY_SIZE(at91rm9200nor_partitions);
????????????????????????part_type?=?"static";
????????????????}
#endif
????????????????add_mtd_device(mymtd);
????????????????if?(mtd_parts_nb?==?0)
??????????????????printk(KERN_NOTICE?MSG_PREFIX?"no?partition?info?availablen");
????????????????else
????????????????{
????????????????????????printk(KERN_NOTICE?MSG_PREFIX
???????????????????????????????"using?%s?partition?definitionn",?part_type); ?//mymtd为master?mtd_info它不被添加到数组mtd_table[]中，它只用于初始化 ?//每一个分区的mtd_info。而后将每一个分区对应的mtd_info添加到数组mtd_table[] ?//供上层调用。MTD原始设备驱动层的主要工作就是向?mtd_table[]中添加mtd_info。?
????????????????????????add_mtd_partitions(mymtd,?mtd_parts,?mtd_parts_nb);
????????????????}
????????????????return?0;
????????}
????????iounmap((void?*)at91rm9200nor_map.virt);
????????return?-ENXIO;
}
static?void?__exit?cleanup_at91rm9200nor(void)
{
????????if?(mymtd)?{
????????????????del_mtd_device(mymtd);
????????????????map_destroy(mymtd);
????????}
????????if?(at91rm9200nor_map.virt)?{
????????????????iounmap((void?*)at91rm9200nor_map.virt);
????????????????at91rm9200nor_map.virt?=?0;
????????}
}
module_init(init_at91rm9200nor);
module_exit(cleanup_at91rm9200nor);
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Marius?Groeger?<mag@sysgo.de>");
MODULE_DESCRIPTION("Generic?configurable?MTD?map?driver"); |
