]> git.sur5r.net Git - openocd/blob - src/flash/s3c2410_nand.c
David Brownell <david-b@pacbell.net>:
[openocd] / src / flash / s3c2410_nand.c
1 /***************************************************************************
2  *   Copyright (C) 2007, 2008 by Ben Dooks                                 *
3  *   ben@fluff.org                                                         *
4  *                                                                         *
5  *   This program is free software; you can redistribute it and/or modify  *
6  *   it under the terms of the GNU General Public License as published by  *
7  *   the Free Software Foundation; either version 2 of the License, or     *
8  *   (at your option) any later version.                                   *
9  *                                                                         *
10  *   This program is distributed in the hope that it will be useful,       *
11  *   but WITHOUT ANY WARRANTY; without even the implied warranty of        *
12  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the         *
13  *   GNU General Public License for more details.                          *
14  *                                                                         *
15  *   You should have received a copy of the GNU General Public License     *
16  *   along with this program; if not, write to the                         *
17  *   Free Software Foundation, Inc.,                                       *
18  *   59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.             *
19  ***************************************************************************/
20
21 /*
22  * S3C2410 OpenOCD NAND Flash controller support.
23  *
24  * Many thanks to Simtec Electronics for sponsoring this work.
25  */
26
27 #ifdef HAVE_CONFIG_H
28 #include "config.h"
29 #endif
30
31 #include "s3c24xx_nand.h"
32
33
34 static int s3c2410_nand_device_command(struct command_context_s *cmd_ctx, char *cmd, char **args, int argc, struct nand_device_s *device);
35 static int s3c2410_init(struct nand_device_s *device);
36 static int s3c2410_read_data(struct nand_device_s *device, void *data);
37 static int s3c2410_write_data(struct nand_device_s *device, u16 data);
38 static int s3c2410_nand_ready(struct nand_device_s *device, int timeout);
39
40 nand_flash_controller_t s3c2410_nand_controller =
41 {
42         .name                   = "s3c2410",
43         .nand_device_command    = s3c2410_nand_device_command,
44         .register_commands      = s3c24xx_register_commands,
45         .init                   = s3c2410_init,
46         .reset                  = s3c24xx_reset,
47         .command                = s3c24xx_command,
48         .address                = s3c24xx_address,
49         .write_data             = s3c2410_write_data,
50         .read_data              = s3c2410_read_data,
51         .write_page             = s3c24xx_write_page,
52         .read_page              = s3c24xx_read_page,
53         .controller_ready       = s3c24xx_controller_ready,
54         .nand_ready             = s3c2410_nand_ready,
55 };
56
57 static int s3c2410_nand_device_command(struct command_context_s *cmd_ctx, char *cmd,
58                                 char **args, int argc,
59                                 struct nand_device_s *device)
60 {
61         s3c24xx_nand_controller_t *info;
62
63         info = s3c24xx_nand_device_command(cmd_ctx, cmd, args, argc, device);
64         if (info == NULL) {
65                 return ERROR_NAND_DEVICE_INVALID;
66         }
67
68         /* fill in the address fields for the core device */
69         info->cmd = S3C2410_NFCMD;
70         info->addr = S3C2410_NFADDR;
71         info->data = S3C2410_NFDATA;
72         info->nfstat = S3C2410_NFSTAT;
73
74         return ERROR_OK;
75 }
76
77 static int s3c2410_init(struct nand_device_s *device)
78 {
79         s3c24xx_nand_controller_t *s3c24xx_info = device->controller_priv;
80         target_t *target = s3c24xx_info->target;
81
82         target_write_u32(target, S3C2410_NFCONF,
83                          S3C2410_NFCONF_EN | S3C2410_NFCONF_TACLS(3) |
84                          S3C2410_NFCONF_TWRPH0(5) | S3C2410_NFCONF_TWRPH1(3));
85
86         return ERROR_OK;
87 }
88
89 static int s3c2410_write_data(struct nand_device_s *device, u16 data)
90 {
91         s3c24xx_nand_controller_t *s3c24xx_info = device->controller_priv;
92         target_t *target = s3c24xx_info->target;
93
94         if (target->state != TARGET_HALTED) {
95                 LOG_ERROR("target must be halted to use S3C24XX NAND flash controller");
96                 return ERROR_NAND_OPERATION_FAILED;
97         }
98
99         target_write_u32(target, S3C2410_NFDATA, data);
100         return ERROR_OK;
101 }
102
103 static int s3c2410_read_data(struct nand_device_s *device, void *data)
104 {
105         s3c24xx_nand_controller_t *s3c24xx_info = device->controller_priv;
106         target_t *target = s3c24xx_info->target;
107
108         if (target->state != TARGET_HALTED) {
109                 LOG_ERROR("target must be halted to use S3C24XX NAND flash controller");
110                 return ERROR_NAND_OPERATION_FAILED;
111         }
112
113         target_read_u8(target, S3C2410_NFDATA, data);
114         return ERROR_OK;
115 }
116
117 static int s3c2410_nand_ready(struct nand_device_s *device, int timeout)
118 {
119         s3c24xx_nand_controller_t *s3c24xx_info = device->controller_priv;
120         target_t *target = s3c24xx_info->target;
121         u8 status;
122
123         if (target->state != TARGET_HALTED) {
124                 LOG_ERROR("target must be halted to use S3C24XX NAND flash controller");
125                 return ERROR_NAND_OPERATION_FAILED;
126         }
127
128         do {
129                 target_read_u8(target, S3C2410_NFSTAT, &status);
130
131                 if (status & S3C2410_NFSTAT_BUSY)
132                         return 1;
133
134                 alive_sleep(1);
135         } while (timeout-- > 0);
136
137         return 0;
138 }