2  * mtdram - a test mtd device
18 #include <linux/mtd/mtd.h>
19 #include <linux/mtd/mtdram.h>
34 // We could store these in the mtd structure, but we only support 1 device..
37 static int check_offs_len(struct mtd_info *mtd, loff_t ofs, uint64_t len)  in check_offs_len()  argument
42 	if (mtd_mod_by_eb(ofs, mtd)) {  in check_offs_len()
48 	if (mtd_mod_by_eb(len, mtd)) {  in check_offs_len()
56 static int ram_erase(struct mtd_info *mtd, struct erase_info *instr)  in ram_erase()  argument
58 	if (check_offs_len(mtd, instr->addr, instr->len))  in ram_erase()
60 	memset((char *)mtd->priv + instr->addr, 0xff, instr->len);  in ram_erase()
65 static int ram_point(struct mtd_info *mtd, loff_t from, size_t len,  in ram_point()  argument
68 	*virt = mtd->priv + from;  in ram_point()
94 static int ram_unpoint(struct mtd_info *mtd, loff_t from, size_t len)  in ram_unpoint()  argument
99 static int ram_read(struct mtd_info *mtd, loff_t from, size_t len,  in ram_read()  argument
102 	memcpy(buf, mtd->priv + from, len);  in ram_read()
107 static int ram_write(struct mtd_info *mtd, loff_t to, size_t len,  in ram_write()  argument
110 	memcpy((char *)mtd->priv + to, buf, len);  in ram_write()
124 int mtdram_init_device(struct mtd_info *mtd, void *mapped_address,  in mtdram_init_device()  argument
127 	memset(mtd, 0, sizeof(*mtd));  in mtdram_init_device()
129 	/* Setup the MTD structure */  in mtdram_init_device()
130 	mtd->name = name;  in mtdram_init_device()
131 	mtd->type = MTD_RAM;  in mtdram_init_device()
132 	mtd->flags = MTD_CAP_RAM;  in mtdram_init_device()
133 	mtd->size = size;  in mtdram_init_device()
134 	mtd->writesize = 1;  in mtdram_init_device()
135 	mtd->writebufsize = writebuf_size;  in mtdram_init_device()
136 	mtd->erasesize = MTDRAM_ERASE_SIZE;  in mtdram_init_device()
137 	mtd->priv = mapped_address;  in mtdram_init_device()
139 	mtd->owner = THIS_MODULE;  in mtdram_init_device()
140 	mtd->_erase = ram_erase;  in mtdram_init_device()
141 	mtd->_point = ram_point;  in mtdram_init_device()
142 	mtd->_unpoint = ram_unpoint;  in mtdram_init_device()
143 	mtd->_read = ram_read;  in mtdram_init_device()
144 	mtd->_write = ram_write;  in mtdram_init_device()
146 	if (mtd_device_register(mtd, NULL, 0))  in mtdram_init_device()
187 MODULE_DESCRIPTION("Simulated MTD driver for testing");