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
|
// SPDX-License-Identifier: GPL-2.0+
/*
* (C) Copyright 2008
* Sergei Poselenov, Emcraft Systems, sposelenov@emcraft.com.
*/
#include <config.h>
#if defined(CFG_SYS_NAND_BASE)
#include <nand.h>
#include <linux/errno.h>
#include <linux/mtd/rawnand.h>
#include <asm/io.h>
static int state;
static void sc_nand_write_byte(struct mtd_info *mtd, u_char byte);
static void sc_nand_write_buf(struct mtd_info *mtd, const u_char *buf, int len);
static u_char sc_nand_read_byte(struct mtd_info *mtd);
static u16 sc_nand_read_word(struct mtd_info *mtd);
static void sc_nand_read_buf(struct mtd_info *mtd, u_char *buf, int len);
static int sc_nand_device_ready(struct mtd_info *mtdinfo);
#define FPGA_NAND_CMD_MASK (0x7 << 28)
#define FPGA_NAND_CMD_COMMAND (0x0 << 28)
#define FPGA_NAND_CMD_ADDR (0x1 << 28)
#define FPGA_NAND_CMD_READ (0x2 << 28)
#define FPGA_NAND_CMD_WRITE (0x3 << 28)
#define FPGA_NAND_BUSY (0x1 << 15)
#define FPGA_NAND_ENABLE (0x1 << 31)
#define FPGA_NAND_DATA_SHIFT 16
/**
* sc_nand_write_byte - write one byte to the chip
* @mtd: MTD device structure
* @byte: pointer to data byte to write
*/
static void sc_nand_write_byte(struct mtd_info *mtd, u_char byte)
{
sc_nand_write_buf(mtd, (const uchar *)&byte, sizeof(byte));
}
/**
* sc_nand_write_buf - write buffer to chip
* @mtd: MTD device structure
* @buf: data buffer
* @len: number of bytes to write
*/
static void sc_nand_write_buf(struct mtd_info *mtd, const u_char *buf, int len)
{
int i;
struct nand_chip *this = mtd_to_nand(mtd);
for (i = 0; i < len; i++) {
out_be32(this->IO_ADDR_W,
state | (buf[i] << FPGA_NAND_DATA_SHIFT));
}
}
/**
* sc_nand_read_byte - read one byte from the chip
* @mtd: MTD device structure
*/
static u_char sc_nand_read_byte(struct mtd_info *mtd)
{
u8 byte;
sc_nand_read_buf(mtd, (uchar *)&byte, sizeof(byte));
return byte;
}
/**
* sc_nand_read_word - read one word from the chip
* @mtd: MTD device structure
*/
static u16 sc_nand_read_word(struct mtd_info *mtd)
{
u16 word;
sc_nand_read_buf(mtd, (uchar *)&word, sizeof(word));
return word;
}
/**
* sc_nand_read_buf - read chip data into buffer
* @mtd: MTD device structure
* @buf: buffer to store date
* @len: number of bytes to read
*/
static void sc_nand_read_buf(struct mtd_info *mtd, u_char *buf, int len)
{
int i;
struct nand_chip *this = mtd_to_nand(mtd);
int val;
val = (state & FPGA_NAND_ENABLE) | FPGA_NAND_CMD_READ;
out_be32(this->IO_ADDR_W, val);
for (i = 0; i < len; i++) {
buf[i] = (in_be32(this->IO_ADDR_R) >> FPGA_NAND_DATA_SHIFT) & 0xff;
}
}
/**
* sc_nand_device_ready - Check the NAND device is ready for next command.
* @mtd: MTD device structure
*/
static int sc_nand_device_ready(struct mtd_info *mtdinfo)
{
struct nand_chip *this = mtd_to_nand(mtdinfo);
if (in_be32(this->IO_ADDR_W) & FPGA_NAND_BUSY)
return 0; /* busy */
return 1;
}
/**
* sc_nand_hwcontrol - NAND control functions wrapper.
* @mtd: MTD device structure
* @cmd: Command
*/
static void sc_nand_hwcontrol(struct mtd_info *mtdinfo, int cmd, unsigned int ctrl)
{
if (ctrl & NAND_CTRL_CHANGE) {
state &= ~(FPGA_NAND_CMD_MASK | FPGA_NAND_ENABLE);
switch (ctrl & (NAND_ALE | NAND_CLE)) {
case 0:
state |= FPGA_NAND_CMD_WRITE;
break;
case NAND_ALE:
state |= FPGA_NAND_CMD_ADDR;
break;
case NAND_CLE:
state |= FPGA_NAND_CMD_COMMAND;
break;
default:
printf("%s: unknown ctrl %#x\n", __FUNCTION__, ctrl);
}
if (ctrl & NAND_NCE)
state |= FPGA_NAND_ENABLE;
}
if (cmd != NAND_CMD_NONE)
sc_nand_write_byte(mtdinfo, cmd);
}
int board_nand_init(struct nand_chip *nand)
{
nand->cmd_ctrl = sc_nand_hwcontrol;
nand->ecc.mode = NAND_ECC_SOFT;
nand->dev_ready = sc_nand_device_ready;
nand->read_byte = sc_nand_read_byte;
nand->read_word = sc_nand_read_word;
nand->write_buf = sc_nand_write_buf;
nand->read_buf = sc_nand_read_buf;
return 0;
}
#endif
|
