1 /****************************************************************************/ 2 3 /* 4 * uclinux.c -- generic memory mapped MTD driver for uclinux 5 * 6 * (C) Copyright 2002, Greg Ungerer (gerg@snapgear.com) 7 */ 8 9 /****************************************************************************/ 10 11 #include <linux/module.h> 12 #include <linux/types.h> 13 #include <linux/init.h> 14 #include <linux/kernel.h> 15 #include <linux/fs.h> 16 #include <linux/mm.h> 17 #include <linux/major.h> 18 #include <linux/mtd/mtd.h> 19 #include <linux/mtd/map.h> 20 #include <linux/mtd/partitions.h> 21 #include <asm/io.h> 22 23 /****************************************************************************/ 24 25 struct map_info uclinux_ram_map = { 26 .name = "RAM", 27 }; 28 29 struct mtd_info *uclinux_ram_mtdinfo; 30 31 /****************************************************************************/ 32 33 struct mtd_partition uclinux_romfs[] = { 34 { .name = "ROMfs" } 35 }; 36 37 #define NUM_PARTITIONS ARRAY_SIZE(uclinux_romfs) 38 39 /****************************************************************************/ 40 41 int uclinux_point(struct mtd_info *mtd, loff_t from, size_t len, 42 size_t *retlen, void **virt, resource_size_t *phys) 43 { 44 struct map_info *map = mtd->priv; 45 *virt = map->virt + from; 46 if (phys) 47 *phys = map->phys + from; 48 *retlen = len; 49 return(0); 50 } 51 52 /****************************************************************************/ 53 54 static int __init uclinux_mtd_init(void) 55 { 56 struct mtd_info *mtd; 57 struct map_info *mapp; 58 extern char _ebss; 59 unsigned long addr = (unsigned long) &_ebss; 60 61 mapp = &uclinux_ram_map; 62 mapp->phys = addr; 63 mapp->size = PAGE_ALIGN(ntohl(*((unsigned long *)(addr + 8)))); 64 mapp->bankwidth = 4; 65 66 printk("uclinux[mtd]: RAM probe address=0x%x size=0x%x\n", 67 (int) mapp->phys, (int) mapp->size); 68 69 mapp->virt = ioremap_nocache(mapp->phys, mapp->size); 70 71 if (mapp->virt == 0) { 72 printk("uclinux[mtd]: ioremap_nocache() failed\n"); 73 return(-EIO); 74 } 75 76 simple_map_init(mapp); 77 78 mtd = do_map_probe("map_ram", mapp); 79 if (!mtd) { 80 printk("uclinux[mtd]: failed to find a mapping?\n"); 81 iounmap(mapp->virt); 82 return(-ENXIO); 83 } 84 85 mtd->owner = THIS_MODULE; 86 mtd->point = uclinux_point; 87 mtd->priv = mapp; 88 89 uclinux_ram_mtdinfo = mtd; 90 add_mtd_partitions(mtd, uclinux_romfs, NUM_PARTITIONS); 91 92 return(0); 93 } 94 95 /****************************************************************************/ 96 97 static void __exit uclinux_mtd_cleanup(void) 98 { 99 if (uclinux_ram_mtdinfo) { 100 del_mtd_partitions(uclinux_ram_mtdinfo); 101 map_destroy(uclinux_ram_mtdinfo); 102 uclinux_ram_mtdinfo = NULL; 103 } 104 if (uclinux_ram_map.virt) { 105 iounmap((void *) uclinux_ram_map.virt); 106 uclinux_ram_map.virt = 0; 107 } 108 } 109 110 /****************************************************************************/ 111 112 module_init(uclinux_mtd_init); 113 module_exit(uclinux_mtd_cleanup); 114 115 MODULE_LICENSE("GPL"); 116 MODULE_AUTHOR("Greg Ungerer <gerg@snapgear.com>"); 117 MODULE_DESCRIPTION("Generic RAM based MTD for uClinux"); 118 119 /****************************************************************************/ 120