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1/*
2 * mtdram - a test mtd device
3 * Author: Alexander Larsson <alex@cendio.se>
4 *
5 * Copyright (c) 1999 Alexander Larsson <alex@cendio.se>
6 * Copyright (c) 2005 Joern Engel <joern@wh.fh-wedel.de>
7 *
8 * This code is GPL
9 *
10 */
11
12#include <linux/module.h>
13#include <linux/slab.h>
14#include <linux/ioport.h>
15#include <linux/vmalloc.h>
16#include <linux/mm.h>
17#include <linux/init.h>
18#include <linux/mtd/mtd.h>
19#include <linux/mtd/mtdram.h>
20
21static unsigned long total_size = CONFIG_MTDRAM_TOTAL_SIZE;
22static unsigned long erase_size = CONFIG_MTDRAM_ERASE_SIZE;
23static unsigned long writebuf_size = 64;
24#define MTDRAM_TOTAL_SIZE (total_size * 1024)
25#define MTDRAM_ERASE_SIZE (erase_size * 1024)
26
27module_param(total_size, ulong, 0);
28MODULE_PARM_DESC(total_size, "Total device size in KiB");
29module_param(erase_size, ulong, 0);
30MODULE_PARM_DESC(erase_size, "Device erase block size in KiB");
31module_param(writebuf_size, ulong, 0);
32MODULE_PARM_DESC(writebuf_size, "Device write buf size in Bytes (Default: 64)");
33
34// We could store these in the mtd structure, but we only support 1 device..
35static struct mtd_info *mtd_info;
36
37static int check_offs_len(struct mtd_info *mtd, loff_t ofs, uint64_t len)
38{
39 int ret = 0;
40
41 /* Start address must align on block boundary */
42 if (mtd_mod_by_eb(ofs, mtd)) {
43 pr_debug("%s: unaligned address\n", __func__);
44 ret = -EINVAL;
45 }
46
47 /* Length must align on block boundary */
48 if (mtd_mod_by_eb(len, mtd)) {
49 pr_debug("%s: length not block aligned\n", __func__);
50 ret = -EINVAL;
51 }
52
53 return ret;
54}
55
56static int ram_erase(struct mtd_info *mtd, struct erase_info *instr)
57{
58 if (check_offs_len(mtd, instr->addr, instr->len))
59 return -EINVAL;
60 memset((char *)mtd->priv + instr->addr, 0xff, instr->len);
61
62 return 0;
63}
64
65static int ram_point(struct mtd_info *mtd, loff_t from, size_t len,
66 size_t *retlen, void **virt, resource_size_t *phys)
67{
68 *virt = mtd->priv + from;
69 *retlen = len;
70
71 if (phys) {
72 /* limit retlen to the number of contiguous physical pages */
73 unsigned long page_ofs = offset_in_page(*virt);
74 void *addr = *virt - page_ofs;
75 unsigned long pfn1, pfn0 = vmalloc_to_pfn(addr);
76
77 *phys = __pfn_to_phys(pfn0) + page_ofs;
78 len += page_ofs;
79 while (len > PAGE_SIZE) {
80 len -= PAGE_SIZE;
81 addr += PAGE_SIZE;
82 pfn0++;
83 pfn1 = vmalloc_to_pfn(addr);
84 if (pfn1 != pfn0) {
85 *retlen = addr - *virt;
86 break;
87 }
88 }
89 }
90
91 return 0;
92}
93
94static int ram_unpoint(struct mtd_info *mtd, loff_t from, size_t len)
95{
96 return 0;
97}
98
99static int ram_read(struct mtd_info *mtd, loff_t from, size_t len,
100 size_t *retlen, u_char *buf)
101{
102 memcpy(buf, mtd->priv + from, len);
103 *retlen = len;
104 return 0;
105}
106
107static int ram_write(struct mtd_info *mtd, loff_t to, size_t len,
108 size_t *retlen, const u_char *buf)
109{
110 memcpy((char *)mtd->priv + to, buf, len);
111 *retlen = len;
112 return 0;
113}
114
115static void __exit cleanup_mtdram(void)
116{
117 if (mtd_info) {
118 mtd_device_unregister(mtd_info);
119 vfree(mtd_info->priv);
120 kfree(mtd_info);
121 }
122}
123
124int mtdram_init_device(struct mtd_info *mtd, void *mapped_address,
125 unsigned long size, const char *name)
126{
127 memset(mtd, 0, sizeof(*mtd));
128
129 /* Setup the MTD structure */
130 mtd->name = name;
131 mtd->type = MTD_RAM;
132 mtd->flags = MTD_CAP_RAM;
133 mtd->size = size;
134 mtd->writesize = 1;
135 mtd->writebufsize = writebuf_size;
136 mtd->erasesize = MTDRAM_ERASE_SIZE;
137 mtd->priv = mapped_address;
138
139 mtd->owner = THIS_MODULE;
140 mtd->_erase = ram_erase;
141 mtd->_point = ram_point;
142 mtd->_unpoint = ram_unpoint;
143 mtd->_read = ram_read;
144 mtd->_write = ram_write;
145
146 if (mtd_device_register(mtd, NULL, 0))
147 return -EIO;
148
149 return 0;
150}
151
152static int __init init_mtdram(void)
153{
154 void *addr;
155 int err;
156
157 if (!total_size)
158 return -EINVAL;
159
160 /* Allocate some memory */
161 mtd_info = kmalloc(sizeof(struct mtd_info), GFP_KERNEL);
162 if (!mtd_info)
163 return -ENOMEM;
164
165 addr = vmalloc(MTDRAM_TOTAL_SIZE);
166 if (!addr) {
167 kfree(mtd_info);
168 mtd_info = NULL;
169 return -ENOMEM;
170 }
171 err = mtdram_init_device(mtd_info, addr, MTDRAM_TOTAL_SIZE, "mtdram test device");
172 if (err) {
173 vfree(addr);
174 kfree(mtd_info);
175 mtd_info = NULL;
176 return err;
177 }
178 memset(mtd_info->priv, 0xff, MTDRAM_TOTAL_SIZE);
179 return err;
180}
181
182module_init(init_mtdram);
183module_exit(cleanup_mtdram);
184
185MODULE_LICENSE("GPL");
186MODULE_AUTHOR("Alexander Larsson <alexl@redhat.com>");
187MODULE_DESCRIPTION("Simulated MTD driver for testing");
1/*
2 * mtdram - a test mtd device
3 * Author: Alexander Larsson <alex@cendio.se>
4 *
5 * Copyright (c) 1999 Alexander Larsson <alex@cendio.se>
6 * Copyright (c) 2005 Joern Engel <joern@wh.fh-wedel.de>
7 *
8 * This code is GPL
9 *
10 */
11
12#include <linux/module.h>
13#include <linux/slab.h>
14#include <linux/ioport.h>
15#include <linux/vmalloc.h>
16#include <linux/init.h>
17#include <linux/mtd/mtd.h>
18#include <linux/mtd/mtdram.h>
19
20static unsigned long total_size = CONFIG_MTDRAM_TOTAL_SIZE;
21static unsigned long erase_size = CONFIG_MTDRAM_ERASE_SIZE;
22static unsigned long writebuf_size = 64;
23#define MTDRAM_TOTAL_SIZE (total_size * 1024)
24#define MTDRAM_ERASE_SIZE (erase_size * 1024)
25
26#ifdef MODULE
27module_param(total_size, ulong, 0);
28MODULE_PARM_DESC(total_size, "Total device size in KiB");
29module_param(erase_size, ulong, 0);
30MODULE_PARM_DESC(erase_size, "Device erase block size in KiB");
31module_param(writebuf_size, ulong, 0);
32MODULE_PARM_DESC(writebuf_size, "Device write buf size in Bytes (Default: 64)");
33#endif
34
35// We could store these in the mtd structure, but we only support 1 device..
36static struct mtd_info *mtd_info;
37
38static int check_offs_len(struct mtd_info *mtd, loff_t ofs, uint64_t len)
39{
40 int ret = 0;
41
42 /* Start address must align on block boundary */
43 if (mtd_mod_by_eb(ofs, mtd)) {
44 pr_debug("%s: unaligned address\n", __func__);
45 ret = -EINVAL;
46 }
47
48 /* Length must align on block boundary */
49 if (mtd_mod_by_eb(len, mtd)) {
50 pr_debug("%s: length not block aligned\n", __func__);
51 ret = -EINVAL;
52 }
53
54 return ret;
55}
56
57static int ram_erase(struct mtd_info *mtd, struct erase_info *instr)
58{
59 if (check_offs_len(mtd, instr->addr, instr->len))
60 return -EINVAL;
61 memset((char *)mtd->priv + instr->addr, 0xff, instr->len);
62 instr->state = MTD_ERASE_DONE;
63 mtd_erase_callback(instr);
64 return 0;
65}
66
67static int ram_point(struct mtd_info *mtd, loff_t from, size_t len,
68 size_t *retlen, void **virt, resource_size_t *phys)
69{
70 *virt = mtd->priv + from;
71 *retlen = len;
72 return 0;
73}
74
75static int ram_unpoint(struct mtd_info *mtd, loff_t from, size_t len)
76{
77 return 0;
78}
79
80/*
81 * Allow NOMMU mmap() to directly map the device (if not NULL)
82 * - return the address to which the offset maps
83 * - return -ENOSYS to indicate refusal to do the mapping
84 */
85static unsigned long ram_get_unmapped_area(struct mtd_info *mtd,
86 unsigned long len,
87 unsigned long offset,
88 unsigned long flags)
89{
90 return (unsigned long) mtd->priv + offset;
91}
92
93static int ram_read(struct mtd_info *mtd, loff_t from, size_t len,
94 size_t *retlen, u_char *buf)
95{
96 memcpy(buf, mtd->priv + from, len);
97 *retlen = len;
98 return 0;
99}
100
101static int ram_write(struct mtd_info *mtd, loff_t to, size_t len,
102 size_t *retlen, const u_char *buf)
103{
104 memcpy((char *)mtd->priv + to, buf, len);
105 *retlen = len;
106 return 0;
107}
108
109static void __exit cleanup_mtdram(void)
110{
111 if (mtd_info) {
112 mtd_device_unregister(mtd_info);
113 vfree(mtd_info->priv);
114 kfree(mtd_info);
115 }
116}
117
118int mtdram_init_device(struct mtd_info *mtd, void *mapped_address,
119 unsigned long size, const char *name)
120{
121 memset(mtd, 0, sizeof(*mtd));
122
123 /* Setup the MTD structure */
124 mtd->name = name;
125 mtd->type = MTD_RAM;
126 mtd->flags = MTD_CAP_RAM;
127 mtd->size = size;
128 mtd->writesize = 1;
129 mtd->writebufsize = writebuf_size;
130 mtd->erasesize = MTDRAM_ERASE_SIZE;
131 mtd->priv = mapped_address;
132
133 mtd->owner = THIS_MODULE;
134 mtd->_erase = ram_erase;
135 mtd->_point = ram_point;
136 mtd->_unpoint = ram_unpoint;
137 mtd->_get_unmapped_area = ram_get_unmapped_area;
138 mtd->_read = ram_read;
139 mtd->_write = ram_write;
140
141 if (mtd_device_register(mtd, NULL, 0))
142 return -EIO;
143
144 return 0;
145}
146
147static int __init init_mtdram(void)
148{
149 void *addr;
150 int err;
151
152 if (!total_size)
153 return -EINVAL;
154
155 /* Allocate some memory */
156 mtd_info = kmalloc(sizeof(struct mtd_info), GFP_KERNEL);
157 if (!mtd_info)
158 return -ENOMEM;
159
160 addr = vmalloc(MTDRAM_TOTAL_SIZE);
161 if (!addr) {
162 kfree(mtd_info);
163 mtd_info = NULL;
164 return -ENOMEM;
165 }
166 err = mtdram_init_device(mtd_info, addr, MTDRAM_TOTAL_SIZE, "mtdram test device");
167 if (err) {
168 vfree(addr);
169 kfree(mtd_info);
170 mtd_info = NULL;
171 return err;
172 }
173 memset(mtd_info->priv, 0xff, MTDRAM_TOTAL_SIZE);
174 return err;
175}
176
177module_init(init_mtdram);
178module_exit(cleanup_mtdram);
179
180MODULE_LICENSE("GPL");
181MODULE_AUTHOR("Alexander Larsson <alexl@redhat.com>");
182MODULE_DESCRIPTION("Simulated MTD driver for testing");