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Sergei Poselenovfd51b0e2008-06-06 15:42:44 +02001/*
2 * (C) Copyright 2008
3 * Sergei Poselenov, Emcraft Systems, sposelenov@emcraft.com.
4 *
5 * See file CREDITS for list of people who contributed to this
6 * project.
7 *
8 * This program is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU General Public License as
10 * published by the Free Software Foundation; either version 2 of
11 * the License, or (at your option) any later version.
12 *
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
17 *
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, write to the Free Software
20 * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
21 * MA 02111-1307 USA
22 */
23
24#include <common.h>
25
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +020026#if defined(CONFIG_SYS_NAND_BASE)
Sergei Poselenovfd51b0e2008-06-06 15:42:44 +020027#include <nand.h>
28#include <asm/errno.h>
29#include <asm/io.h>
30
31static int state;
32static void nand_write_byte(struct mtd_info *mtd, u_char byte);
33static void nand_write_buf(struct mtd_info *mtd, const u_char *buf, int len);
Sergei Poselenovfd51b0e2008-06-06 15:42:44 +020034static u_char nand_read_byte(struct mtd_info *mtd);
35static u16 nand_read_word(struct mtd_info *mtd);
36static void nand_read_buf(struct mtd_info *mtd, u_char *buf, int len);
37static int nand_verify_buf(struct mtd_info *mtd, const u_char *buf, int len);
38static int nand_device_ready(struct mtd_info *mtdinfo);
Sergei Poselenovfd51b0e2008-06-06 15:42:44 +020039
40#define FPGA_NAND_CMD_MASK (0x7 << 28)
Scott Wood68cf19a2008-08-13 18:24:05 -050041#define FPGA_NAND_CMD_COMMAND (0x0 << 28)
Sergei Poselenovfd51b0e2008-06-06 15:42:44 +020042#define FPGA_NAND_CMD_ADDR (0x1 << 28)
43#define FPGA_NAND_CMD_READ (0x2 << 28)
44#define FPGA_NAND_CMD_WRITE (0x3 << 28)
45#define FPGA_NAND_BUSY (0x1 << 15)
46#define FPGA_NAND_ENABLE (0x1 << 31)
Scott Wood68cf19a2008-08-13 18:24:05 -050047#define FPGA_NAND_DATA_SHIFT 16
Sergei Poselenovfd51b0e2008-06-06 15:42:44 +020048
49/**
50 * nand_write_byte - write one byte to the chip
51 * @mtd: MTD device structure
52 * @byte: pointer to data byte to write
53 */
54static void nand_write_byte(struct mtd_info *mtd, u_char byte)
55{
56 nand_write_buf(mtd, (const uchar *)&byte, sizeof(byte));
57}
58
59/**
Sergei Poselenovfd51b0e2008-06-06 15:42:44 +020060 * nand_write_buf - write buffer to chip
61 * @mtd: MTD device structure
62 * @buf: data buffer
63 * @len: number of bytes to write
64 */
65static void nand_write_buf(struct mtd_info *mtd, const u_char *buf, int len)
66{
67 int i;
68 struct nand_chip *this = mtd->priv;
Sergei Poselenovfd51b0e2008-06-06 15:42:44 +020069
70 for (i = 0; i < len; i++) {
Scott Wood68cf19a2008-08-13 18:24:05 -050071 out_be32(this->IO_ADDR_W,
72 state | (buf[i] << FPGA_NAND_DATA_SHIFT));
Sergei Poselenovfd51b0e2008-06-06 15:42:44 +020073 }
74}
75
76
77/**
78 * nand_read_byte - read one byte from the chip
79 * @mtd: MTD device structure
80 */
81static u_char nand_read_byte(struct mtd_info *mtd)
82{
83 u8 byte;
84 nand_read_buf(mtd, (uchar *)&byte, sizeof(byte));
85 return byte;
86}
87
88/**
89 * nand_read_word - read one word from the chip
90 * @mtd: MTD device structure
91 */
92static u16 nand_read_word(struct mtd_info *mtd)
93{
94 u16 word;
95 nand_read_buf(mtd, (uchar *)&word, sizeof(word));
96 return word;
97}
98
99/**
100 * nand_read_buf - read chip data into buffer
101 * @mtd: MTD device structure
102 * @buf: buffer to store date
103 * @len: number of bytes to read
104 */
105static void nand_read_buf(struct mtd_info *mtd, u_char *buf, int len)
106{
107 int i;
108 struct nand_chip *this = mtd->priv;
109 int val;
110
111 val = (state & FPGA_NAND_ENABLE) | FPGA_NAND_CMD_READ;
112
113 out_be32(this->IO_ADDR_W, val);
114 for (i = 0; i < len; i++) {
115 buf[i] = (in_be32(this->IO_ADDR_R) >> FPGA_NAND_DATA_SHIFT) & 0xff;
116 }
117}
118
119/**
120 * nand_verify_buf - Verify chip data against buffer
121 * @mtd: MTD device structure
122 * @buf: buffer containing the data to compare
123 * @len: number of bytes to compare
124 */
125static int nand_verify_buf(struct mtd_info *mtd, const u_char *buf, int len)
126{
127 int i;
128
129 for (i = 0; i < len; i++) {
130 if (buf[i] != nand_read_byte(mtd));
Scott Wood68cf19a2008-08-13 18:24:05 -0500131 return -EFAULT;
Sergei Poselenovfd51b0e2008-06-06 15:42:44 +0200132 }
133 return 0;
134}
135
136/**
137 * nand_device_ready - Check the NAND device is ready for next command.
138 * @mtd: MTD device structure
139 */
140static int nand_device_ready(struct mtd_info *mtdinfo)
141{
142 struct nand_chip *this = mtdinfo->priv;
143
144 if (in_be32(this->IO_ADDR_W) & FPGA_NAND_BUSY)
145 return 0; /* busy */
146 return 1;
147}
148
149/**
150 * nand_hwcontrol - NAND control functions wrapper.
151 * @mtd: MTD device structure
152 * @cmd: Command
153 */
Scott Wood68cf19a2008-08-13 18:24:05 -0500154static void nand_hwcontrol(struct mtd_info *mtdinfo, int cmd, unsigned int ctrl)
Sergei Poselenovfd51b0e2008-06-06 15:42:44 +0200155{
Scott Wood68cf19a2008-08-13 18:24:05 -0500156 if (ctrl & NAND_CTRL_CHANGE) {
157 state &= ~(FPGA_NAND_CMD_MASK | FPGA_NAND_ENABLE);
Sergei Poselenovfd51b0e2008-06-06 15:42:44 +0200158
Scott Wood68cf19a2008-08-13 18:24:05 -0500159 switch (ctrl & (NAND_ALE | NAND_CLE)) {
160 case 0:
161 state |= FPGA_NAND_CMD_WRITE;
162 break;
163
164 case NAND_ALE:
165 state |= FPGA_NAND_CMD_ADDR;
166 break;
167
168 case NAND_CLE:
169 state |= FPGA_NAND_CMD_COMMAND;
170 break;
171
172 default:
173 printf("%s: unknown ctrl %#x\n", __FUNCTION__, ctrl);
174 }
175
176 if (ctrl & NAND_NCE)
177 state |= FPGA_NAND_ENABLE;
Sergei Poselenovfd51b0e2008-06-06 15:42:44 +0200178 }
Scott Wood68cf19a2008-08-13 18:24:05 -0500179
180 if (cmd != NAND_CMD_NONE)
181 nand_write_byte(mtdinfo, cmd);
Sergei Poselenovfd51b0e2008-06-06 15:42:44 +0200182}
183
184int board_nand_init(struct nand_chip *nand)
185{
Scott Wood68cf19a2008-08-13 18:24:05 -0500186 nand->cmd_ctrl = nand_hwcontrol;
187 nand->ecc.mode = NAND_ECC_SOFT;
Sergei Poselenovfd51b0e2008-06-06 15:42:44 +0200188 nand->dev_ready = nand_device_ready;
Sergei Poselenovfd51b0e2008-06-06 15:42:44 +0200189 nand->read_byte = nand_read_byte;
Sergei Poselenovfd51b0e2008-06-06 15:42:44 +0200190 nand->read_word = nand_read_word;
191 nand->write_buf = nand_write_buf;
192 nand->read_buf = nand_read_buf;
193 nand->verify_buf = nand_verify_buf;
194
195 return 0;
196}
197
198#endif