1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
|
/* sbc_gxx.c -- MTD map driver for Arcom Control Systems SBC-MediaGX,
SBC-GXm and SBC-GX1 series boards.
Copyright (C) 2001 Arcom Control System Ltd
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
$Id: sbc_gxx.c,v 1.33 2004/11/28 09:40:40 dwmw2 Exp $
The SBC-MediaGX / SBC-GXx has up to 16 MiB of
Intel StrataFlash (28F320/28F640) in x8 mode.
This driver uses the CFI probe and Intel Extended Command Set drivers.
The flash is accessed as follows:
16 KiB memory window at 0xdc000-0xdffff
Two IO address locations for paging
0x258
bit 0-7: address bit 14-21
0x259
bit 0-1: address bit 22-23
bit 7: 0 - reset/powered down
1 - device enabled
The single flash device is divided into 3 partition which appear as
separate MTD devices.
25/04/2001 AJL (Arcom) Modified signon strings and partition sizes
(to support bzImages up to 638KiB-ish)
*/
// Includes
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/ioport.h>
#include <linux/init.h>
#include <asm/io.h>
#include <linux/mtd/mtd.h>
#include <linux/mtd/map.h>
#include <linux/mtd/partitions.h>
// Defines
// - Hardware specific
#define WINDOW_START 0xdc000
/* Number of bits in offset. */
#define WINDOW_SHIFT 14
#define WINDOW_LENGTH (1 << WINDOW_SHIFT)
/* The bits for the offset into the window. */
#define WINDOW_MASK (WINDOW_LENGTH-1)
#define PAGE_IO 0x258
#define PAGE_IO_SIZE 2
/* bit 7 of 0x259 must be 1 to enable device. */
#define DEVICE_ENABLE 0x8000
// - Flash / Partition sizing
#define MAX_SIZE_KiB 16384
#define BOOT_PARTITION_SIZE_KiB 768
#define DATA_PARTITION_SIZE_KiB 1280
#define APP_PARTITION_SIZE_KiB 6144
// Globals
static volatile int page_in_window = -1; // Current page in window.
static void __iomem *iomapadr;
static DEFINE_SPINLOCK(sbc_gxx_spin);
/* partition_info gives details on the logical partitions that the split the
* single flash device into. If the size if zero we use up to the end of the
* device. */
static struct mtd_partition partition_info[]={
{ .name = "SBC-GXx flash boot partition",
.offset = 0,
.size = BOOT_PARTITION_SIZE_KiB*1024 },
{ .name = "SBC-GXx flash data partition",
.offset = BOOT_PARTITION_SIZE_KiB*1024,
.size = (DATA_PARTITION_SIZE_KiB)*1024 },
{ .name = "SBC-GXx flash application partition",
.offset = (BOOT_PARTITION_SIZE_KiB+DATA_PARTITION_SIZE_KiB)*1024 }
};
#define NUM_PARTITIONS 3
static inline void sbc_gxx_page(struct map_info *map, unsigned long ofs)
{
unsigned long page = ofs >> WINDOW_SHIFT;
if( page!=page_in_window ) {
outw( page | DEVICE_ENABLE, PAGE_IO );
page_in_window = page;
}
}
static map_word sbc_gxx_read8(struct map_info *map, unsigned long ofs)
{
map_word ret;
spin_lock(&sbc_gxx_spin);
sbc_gxx_page(map, ofs);
ret.x[0] = readb(iomapadr + (ofs & WINDOW_MASK));
spin_unlock(&sbc_gxx_spin);
return ret;
}
static void sbc_gxx_copy_from(struct map_info *map, void *to, unsigned long from, ssize_t len)
{
while(len) {
unsigned long thislen = len;
if (len > (WINDOW_LENGTH - (from & WINDOW_MASK)))
thislen = WINDOW_LENGTH-(from & WINDOW_MASK);
spin_lock(&sbc_gxx_spin);
sbc_gxx_page(map, from);
memcpy_fromio(to, iomapadr + (from & WINDOW_MASK), thislen);
spin_unlock(&sbc_gxx_spin);
to += thislen;
from += thislen;
len -= thislen;
}
}
static void sbc_gxx_write8(struct map_info *map, map_word d, unsigned long adr)
{
spin_lock(&sbc_gxx_spin);
sbc_gxx_page(map, adr);
writeb(d.x[0], iomapadr + (adr & WINDOW_MASK));
spin_unlock(&sbc_gxx_spin);
}
static void sbc_gxx_copy_to(struct map_info *map, unsigned long to, const void *from, ssize_t len)
{
while(len) {
unsigned long thislen = len;
if (len > (WINDOW_LENGTH - (to & WINDOW_MASK)))
thislen = WINDOW_LENGTH-(to & WINDOW_MASK);
spin_lock(&sbc_gxx_spin);
sbc_gxx_page(map, to);
memcpy_toio(iomapadr + (to & WINDOW_MASK), from, thislen);
spin_unlock(&sbc_gxx_spin);
to += thislen;
from += thislen;
len -= thislen;
}
}
static struct map_info sbc_gxx_map = {
.name = "SBC-GXx flash",
.phys = NO_XIP,
.size = MAX_SIZE_KiB*1024, /* this must be set to a maximum possible amount
of flash so the cfi probe routines find all
the chips */
.bankwidth = 1,
.read = sbc_gxx_read8,
.copy_from = sbc_gxx_copy_from,
.write = sbc_gxx_write8,
.copy_to = sbc_gxx_copy_to
};
/* MTD device for all of the flash. */
static struct mtd_info *all_mtd;
static void cleanup_sbc_gxx(void)
{
if( all_mtd ) {
del_mtd_partitions( all_mtd );
map_destroy( all_mtd );
}
iounmap(iomapadr);
release_region(PAGE_IO,PAGE_IO_SIZE);
}
static int __init init_sbc_gxx(void)
{
iomapadr = ioremap(WINDOW_START, WINDOW_LENGTH);
if (!iomapadr) {
printk( KERN_ERR"%s: failed to ioremap memory region\n",
sbc_gxx_map.name );
return -EIO;
}
if (!request_region( PAGE_IO, PAGE_IO_SIZE, "SBC-GXx flash")) {
printk( KERN_ERR"%s: IO ports 0x%x-0x%x in use\n",
sbc_gxx_map.name,
PAGE_IO, PAGE_IO+PAGE_IO_SIZE-1 );
iounmap(iomapadr);
return -EAGAIN;
}
printk( KERN_INFO"%s: IO:0x%x-0x%x MEM:0x%x-0x%x\n",
sbc_gxx_map.name,
PAGE_IO, PAGE_IO+PAGE_IO_SIZE-1,
WINDOW_START, WINDOW_START+WINDOW_LENGTH-1 );
/* Probe for chip. */
all_mtd = do_map_probe( "cfi_probe", &sbc_gxx_map );
if( !all_mtd ) {
cleanup_sbc_gxx();
return -ENXIO;
}
all_mtd->owner = THIS_MODULE;
/* Create MTD devices for each partition. */
add_mtd_partitions(all_mtd, partition_info, NUM_PARTITIONS );
return 0;
}
module_init(init_sbc_gxx);
module_exit(cleanup_sbc_gxx);
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Arcom Control Systems Ltd.");
MODULE_DESCRIPTION("MTD map driver for SBC-GXm and SBC-GX1 series boards");
|
