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
240
241
242
243
244
|
/*
* Copyright (C) 2006-2007 PA Semi, Inc
*
* Author: Egor Martovetsky <egor@pasemi.com>
* Maintained by: Olof Johansson <olof@lixom.net>
*
* Driver for the PWRficient onchip NAND flash interface
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*
* 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
*/
#undef DEBUG
#include <linux/slab.h>
#include <linux/init.h>
#include <linux/module.h>
#include <linux/mtd/mtd.h>
#include <linux/mtd/nand.h>
#include <linux/mtd/nand_ecc.h>
#include <linux/of_platform.h>
#include <linux/platform_device.h>
#include <linux/pci.h>
#include <asm/io.h>
#define LBICTRL_LPCCTL_NR 0x00004000
#define CLE_PIN_CTL 15
#define ALE_PIN_CTL 14
static unsigned int lpcctl;
static struct mtd_info *pasemi_nand_mtd;
static const char driver_name[] = "pasemi-nand";
static void pasemi_read_buf(struct mtd_info *mtd, u_char *buf, int len)
{
struct nand_chip *chip = mtd->priv;
while (len > 0x800) {
memcpy_fromio(buf, chip->IO_ADDR_R, 0x800);
buf += 0x800;
len -= 0x800;
}
memcpy_fromio(buf, chip->IO_ADDR_R, len);
}
static void pasemi_write_buf(struct mtd_info *mtd, const u_char *buf, int len)
{
struct nand_chip *chip = mtd->priv;
while (len > 0x800) {
memcpy_toio(chip->IO_ADDR_R, buf, 0x800);
buf += 0x800;
len -= 0x800;
}
memcpy_toio(chip->IO_ADDR_R, buf, len);
}
static void pasemi_hwcontrol(struct mtd_info *mtd, int cmd,
unsigned int ctrl)
{
struct nand_chip *chip = mtd->priv;
if (cmd == NAND_CMD_NONE)
return;
if (ctrl & NAND_CLE)
out_8(chip->IO_ADDR_W + (1 << CLE_PIN_CTL), cmd);
else
out_8(chip->IO_ADDR_W + (1 << ALE_PIN_CTL), cmd);
/* Push out posted writes */
eieio();
inl(lpcctl);
}
int pasemi_device_ready(struct mtd_info *mtd)
{
return !!(inl(lpcctl) & LBICTRL_LPCCTL_NR);
}
static int __devinit pasemi_nand_probe(struct of_device *ofdev,
const struct of_device_id *match)
{
struct pci_dev *pdev;
struct device_node *np = ofdev->node;
struct resource res;
struct nand_chip *chip;
int err = 0;
err = of_address_to_resource(np, 0, &res);
if (err)
return -EINVAL;
/* We only support one device at the moment */
if (pasemi_nand_mtd)
return -ENODEV;
pr_debug("pasemi_nand at %llx-%llx\n", res.start, res.end);
/* Allocate memory for MTD device structure and private data */
pasemi_nand_mtd = kzalloc(sizeof(struct mtd_info) +
sizeof(struct nand_chip), GFP_KERNEL);
if (!pasemi_nand_mtd) {
printk(KERN_WARNING
"Unable to allocate PASEMI NAND MTD device structure\n");
err = -ENOMEM;
goto out;
}
/* Get pointer to private data */
chip = (struct nand_chip *)&pasemi_nand_mtd[1];
/* Link the private data with the MTD structure */
pasemi_nand_mtd->priv = chip;
pasemi_nand_mtd->owner = THIS_MODULE;
chip->IO_ADDR_R = of_iomap(np, 0);
chip->IO_ADDR_W = chip->IO_ADDR_R;
if (!chip->IO_ADDR_R) {
err = -EIO;
goto out_mtd;
}
pdev = pci_get_device(PCI_VENDOR_ID_PASEMI, 0xa008, NULL);
if (!pdev) {
err = -ENODEV;
goto out_ior;
}
lpcctl = pci_resource_start(pdev, 0);
pci_dev_put(pdev);
if (!request_region(lpcctl, 4, driver_name)) {
err = -EBUSY;
goto out_ior;
}
chip->cmd_ctrl = pasemi_hwcontrol;
chip->dev_ready = pasemi_device_ready;
chip->read_buf = pasemi_read_buf;
chip->write_buf = pasemi_write_buf;
chip->chip_delay = 0;
chip->ecc.mode = NAND_ECC_SOFT;
/* Enable the following for a flash based bad block table */
chip->options = NAND_USE_FLASH_BBT | NAND_NO_AUTOINCR;
/* Scan to find existance of the device */
if (nand_scan(pasemi_nand_mtd, 1)) {
err = -ENXIO;
goto out_lpc;
}
if (add_mtd_device(pasemi_nand_mtd)) {
printk(KERN_ERR "pasemi_nand: Unable to register MTD device\n");
err = -ENODEV;
goto out_lpc;
}
printk(KERN_INFO "PA Semi NAND flash at %08llx, control at I/O %x\n",
res.start, lpcctl);
return 0;
out_lpc:
release_region(lpcctl, 4);
out_ior:
iounmap(chip->IO_ADDR_R);
out_mtd:
kfree(pasemi_nand_mtd);
out:
return err;
}
static int __devexit pasemi_nand_remove(struct of_device *ofdev)
{
struct nand_chip *chip;
if (!pasemi_nand_mtd)
return 0;
chip = pasemi_nand_mtd->priv;
/* Release resources, unregister device */
nand_release(pasemi_nand_mtd);
release_region(lpcctl, 4);
iounmap(chip->IO_ADDR_R);
/* Free the MTD device structure */
kfree(pasemi_nand_mtd);
pasemi_nand_mtd = NULL;
return 0;
}
static const struct of_device_id pasemi_nand_match[] =
{
{
.compatible = "pasemi,localbus-nand",
},
{},
};
MODULE_DEVICE_TABLE(of, pasemi_nand_match);
static struct of_platform_driver pasemi_nand_driver =
{
.name = (char*)driver_name,
.match_table = pasemi_nand_match,
.probe = pasemi_nand_probe,
.remove = pasemi_nand_remove,
};
static int __init pasemi_nand_init(void)
{
return of_register_platform_driver(&pasemi_nand_driver);
}
module_init(pasemi_nand_init);
static void __exit pasemi_nand_exit(void)
{
of_unregister_platform_driver(&pasemi_nand_driver);
}
module_exit(pasemi_nand_exit);
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Egor Martovetsky <egor@pasemi.com>");
MODULE_DESCRIPTION("NAND flash interface driver for PA Semi PWRficient");
|
