1 // SPDX-License-Identifier: GPL-2.0-only
4  * Copyright (c) 2003-2004	Joern Engel <joern@wh.fh-wedel.de>
28 #include <linux/mtd/mtd.h>
31 	struct mtd_info mtd;  member
37 static int phram_erase(struct mtd_info *mtd, struct erase_info *instr)  in phram_erase()  argument
39 	u_char *start = mtd->priv;  in phram_erase()
41 	memset(start + instr->addr, 0xff, instr->len);  in phram_erase()
46 static int phram_point(struct mtd_info *mtd, loff_t from, size_t len,  in phram_point()  argument
49 	*virt = mtd->priv + from;  in phram_point()
54 static int phram_unpoint(struct mtd_info *mtd, loff_t from, size_t len)  in phram_unpoint()  argument
59 static int phram_read(struct mtd_info *mtd, loff_t from, size_t len,  in phram_read()  argument
62 	u_char *start = mtd->priv;  in phram_read()
69 static int phram_write(struct mtd_info *mtd, loff_t to, size_t len,  in phram_write()  argument
72 	u_char *start = mtd->priv;  in phram_write()
84 		mtd_device_unregister(&this->mtd);  in unregister_devices()
85 		iounmap(this->mtd.priv);  in unregister_devices()
86 		kfree(this->mtd.name);  in unregister_devices()
94 	int ret = -ENOMEM;  in register_device()
100 	ret = -EIO;  in register_device()
101 	new->mtd.priv = ioremap(start, len);  in register_device()
102 	if (!new->mtd.priv) {  in register_device()
108 	new->mtd.name = name;  in register_device()
109 	new->mtd.size = len;  in register_device()
110 	new->mtd.flags = MTD_CAP_RAM;  in register_device()
111 	new->mtd._erase = phram_erase;  in register_device()
112 	new->mtd._point = phram_point;  in register_device()
113 	new->mtd._unpoint = phram_unpoint;  in register_device()
114 	new->mtd._read = phram_read;  in register_device()
115 	new->mtd._write = phram_write;  in register_device()
116 	new->mtd.owner = THIS_MODULE;  in register_device()
117 	new->mtd.type = MTD_RAM;  in register_device()
118 	new->mtd.erasesize = PAGE_SIZE;  in register_device()
119 	new->mtd.writesize = 1;  in register_device()
121 	ret = -EAGAIN;  in register_device()
122 	if (mtd_device_register(&new->mtd, NULL, 0)) {  in register_device()
127 	list_add_tail(&new->list, &phram_list);  in register_device()
131 	iounmap(new->mtd.priv);  in register_device()
147 		if (token[len - 1] == 'i') {  in parse_num64()
148 			switch (token[len - 2]) {  in parse_num64()
157 				token[len - 2] = 0;  in parse_num64()
160 				return -EINVAL;  in parse_num64()
178 		return -ENOSPC;  in parse_name()
182 		return -ENOMEM;  in parse_name()
207  * - phram=<device>,<address>,<size> for module case
208  * - phram.phram=<device>,<address>,<size> for built-in case
293 		return -ENOSPC;  in phram_param_call()
326 MODULE_AUTHOR("Joern Engel <joern@wh.fh-wedel.de>");
327 MODULE_DESCRIPTION("MTD driver for physical RAM");