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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;
22#define MTDRAM_TOTAL_SIZE (total_size * 1024)
23#define MTDRAM_ERASE_SIZE (erase_size * 1024)
24
25#ifdef MODULE
26module_param(total_size, ulong, 0);
27MODULE_PARM_DESC(total_size, "Total device size in KiB");
28module_param(erase_size, ulong, 0);
29MODULE_PARM_DESC(erase_size, "Device erase block size in KiB");
30#endif
31
32// We could store these in the mtd structure, but we only support 1 device..
33static struct mtd_info *mtd_info;
34
35static int ram_erase(struct mtd_info *mtd, struct erase_info *instr)
36{
37 if (instr->addr + instr->len > mtd->size)
38 return -EINVAL;
39
40 memset((char *)mtd->priv + instr->addr, 0xff, instr->len);
41
42 instr->state = MTD_ERASE_DONE;
43 mtd_erase_callback(instr);
44
45 return 0;
46}
47
48static int ram_point(struct mtd_info *mtd, loff_t from, size_t len,
49 size_t *retlen, void **virt, resource_size_t *phys)
50{
51 if (from + len > mtd->size)
52 return -EINVAL;
53
54 /* can we return a physical address with this driver? */
55 if (phys)
56 return -EINVAL;
57
58 *virt = mtd->priv + from;
59 *retlen = len;
60 return 0;
61}
62
63static void ram_unpoint(struct mtd_info *mtd, loff_t from, size_t len)
64{
65}
66
67/*
68 * Allow NOMMU mmap() to directly map the device (if not NULL)
69 * - return the address to which the offset maps
70 * - return -ENOSYS to indicate refusal to do the mapping
71 */
72static unsigned long ram_get_unmapped_area(struct mtd_info *mtd,
73 unsigned long len,
74 unsigned long offset,
75 unsigned long flags)
76{
77 return (unsigned long) mtd->priv + offset;
78}
79
80static int ram_read(struct mtd_info *mtd, loff_t from, size_t len,
81 size_t *retlen, u_char *buf)
82{
83 if (from + len > mtd->size)
84 return -EINVAL;
85
86 memcpy(buf, mtd->priv + from, len);
87
88 *retlen = len;
89 return 0;
90}
91
92static int ram_write(struct mtd_info *mtd, loff_t to, size_t len,
93 size_t *retlen, const u_char *buf)
94{
95 if (to + len > mtd->size)
96 return -EINVAL;
97
98 memcpy((char *)mtd->priv + to, buf, len);
99
100 *retlen = len;
101 return 0;
102}
103
104static void __exit cleanup_mtdram(void)
105{
106 if (mtd_info) {
107 mtd_device_unregister(mtd_info);
108 vfree(mtd_info->priv);
109 kfree(mtd_info);
110 }
111}
112
113int mtdram_init_device(struct mtd_info *mtd, void *mapped_address,
114 unsigned long size, char *name)
115{
116 memset(mtd, 0, sizeof(*mtd));
117
118 /* Setup the MTD structure */
119 mtd->name = name;
120 mtd->type = MTD_RAM;
121 mtd->flags = MTD_CAP_RAM;
122 mtd->size = size;
123 mtd->writesize = 1;
124 mtd->writebufsize = 64; /* Mimic CFI NOR flashes */
125 mtd->erasesize = MTDRAM_ERASE_SIZE;
126 mtd->priv = mapped_address;
127
128 mtd->owner = THIS_MODULE;
129 mtd->erase = ram_erase;
130 mtd->point = ram_point;
131 mtd->unpoint = ram_unpoint;
132 mtd->get_unmapped_area = ram_get_unmapped_area;
133 mtd->read = ram_read;
134 mtd->write = ram_write;
135
136 if (mtd_device_register(mtd, NULL, 0))
137 return -EIO;
138
139 return 0;
140}
141
142static int __init init_mtdram(void)
143{
144 void *addr;
145 int err;
146
147 if (!total_size)
148 return -EINVAL;
149
150 /* Allocate some memory */
151 mtd_info = kmalloc(sizeof(struct mtd_info), GFP_KERNEL);
152 if (!mtd_info)
153 return -ENOMEM;
154
155 addr = vmalloc(MTDRAM_TOTAL_SIZE);
156 if (!addr) {
157 kfree(mtd_info);
158 mtd_info = NULL;
159 return -ENOMEM;
160 }
161 err = mtdram_init_device(mtd_info, addr, MTDRAM_TOTAL_SIZE, "mtdram test device");
162 if (err) {
163 vfree(addr);
164 kfree(mtd_info);
165 mtd_info = NULL;
166 return err;
167 }
168 memset(mtd_info->priv, 0xff, MTDRAM_TOTAL_SIZE);
169 return err;
170}
171
172module_init(init_mtdram);
173module_exit(cleanup_mtdram);
174
175MODULE_LICENSE("GPL");
176MODULE_AUTHOR("Alexander Larsson <alexl@redhat.com>");
177MODULE_DESCRIPTION("Simulated MTD driver for testing");