1 /*
2 * Copyright (C) 2005 - 2007 by Basler Vision Technologies AG
3 * Author: Thomas Koeller <thomas.koeller.qbaslerweb.com>
4 * Original code by Thies Moeller <thies.moeller@baslerweb.com>
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
10 *
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
15 *
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, write to the Free Software
18 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
19 */
20
21 #include <linux/module.h>
22 #include <linux/types.h>
23 #include <linux/init.h>
24 #include <linux/kernel.h>
25 #include <linux/string.h>
26 #include <linux/ioport.h>
27 #include <linux/platform_device.h>
28 #include <linux/delay.h>
29 #include <linux/err.h>
30
31 #include <linux/mtd/mtd.h>
32 #include <linux/mtd/nand.h>
33 #include <linux/mtd/nand_ecc.h>
34 #include <linux/mtd/partitions.h>
35
36 #include <asm/io.h>
37 #include <asm/rm9k-ocd.h>
38
39 #include <excite_nandflash.h>
40
41 #define EXCITE_NANDFLASH_VERSION "0.1"
42
43 /* I/O register offsets */
44 #define EXCITE_NANDFLASH_DATA_BYTE 0x00
45 #define EXCITE_NANDFLASH_STATUS_BYTE 0x0c
46 #define EXCITE_NANDFLASH_ADDR_BYTE 0x10
47 #define EXCITE_NANDFLASH_CMD_BYTE 0x14
48
49 /* prefix for debug output */
50 static const char module_id[] = "excite_nandflash";
51
52 /*
53 * partition definition
54 */
55 static const struct mtd_partition partition_info[] = {
56 {
57 .name = "eXcite RootFS",
58 .offset = 0,
59 .size = MTDPART_SIZ_FULL
60 }
61 };
62
63 static inline const struct resource *
64 excite_nand_get_resource(struct platform_device *d, unsigned long flags,
65 const char *basename)
66 {
67 char buf[80];
68
69 if (snprintf(buf, sizeof buf, "%s_%u", basename, d->id) >= sizeof buf)
70 return NULL;
71 return platform_get_resource_byname(d, flags, buf);
72 }
73
74 static inline void __iomem *
75 excite_nand_map_regs(struct platform_device *d, const char *basename)
76 {
77 void *result = NULL;
78 const struct resource *const r =
79 excite_nand_get_resource(d, IORESOURCE_MEM, basename);
80
81 if (r)
82 result = ioremap_nocache(r->start, r->end + 1 - r->start);
83 return result;
84 }
85
86 /* controller and mtd information */
87 struct excite_nand_drvdata {
88 struct mtd_info board_mtd;
89 struct nand_chip board_chip;
90 void __iomem *regs;
91 void __iomem *tgt;
92 };
93
94 /* Control function */
95 static void excite_nand_control(struct mtd_info *mtd, int cmd,
96 unsigned int ctrl)
97 {
98 struct excite_nand_drvdata * const d =
99 container_of(mtd, struct excite_nand_drvdata, board_mtd);
100
101 switch (ctrl) {
102 case NAND_CTRL_CHANGE | NAND_CTRL_CLE:
103 d->tgt = d->regs + EXCITE_NANDFLASH_CMD_BYTE;
104 break;
105 case NAND_CTRL_CHANGE | NAND_CTRL_ALE:
106 d->tgt = d->regs + EXCITE_NANDFLASH_ADDR_BYTE;
107 break;
108 case NAND_CTRL_CHANGE | NAND_NCE:
109 d->tgt = d->regs + EXCITE_NANDFLASH_DATA_BYTE;
110 break;
111 }
112
113 if (cmd != NAND_CMD_NONE)
114 __raw_writeb(cmd, d->tgt);
115 }
116
117 /* Return 0 if flash is busy, 1 if ready */
118 static int excite_nand_devready(struct mtd_info *mtd)
119 {
120 struct excite_nand_drvdata * const drvdata =
121 container_of(mtd, struct excite_nand_drvdata, board_mtd);
122
123 return __raw_readb(drvdata->regs + EXCITE_NANDFLASH_STATUS_BYTE);
124 }
125
126 /*
127 * Called by device layer to remove the driver.
128 * The binding to the mtd and all allocated
129 * resources are released.
130 */
131 static int __exit excite_nand_remove(struct platform_device *dev)
132 {
133 struct excite_nand_drvdata * const this = platform_get_drvdata(dev);
134
135 platform_set_drvdata(dev, NULL);
136
137 if (unlikely(!this)) {
138 printk(KERN_ERR "%s: called %s without private data!!",
139 module_id, __func__);
140 return -EINVAL;
141 }
142
143 /* first thing we need to do is release our mtd
144 * then go through freeing the resource used
145 */
146 nand_release(&this->board_mtd);
147
148 /* free the common resources */
149 iounmap(this->regs);
150 kfree(this);
151
152 DEBUG(MTD_DEBUG_LEVEL1, "%s: removed\n", module_id);
153 return 0;
154 }
155
156 /*
157 * Called by device layer when it finds a device matching
158 * one our driver can handle. This code checks to see if
159 * it can allocate all necessary resources then calls the
160 * nand layer to look for devices.
161 */
162 static int __init excite_nand_probe(struct platform_device *pdev)
163 {
164 struct excite_nand_drvdata *drvdata; /* private driver data */
165 struct nand_chip *board_chip; /* private flash chip data */
166 struct mtd_info *board_mtd; /* mtd info for this board */
167 int scan_res;
168
169 drvdata = kzalloc(sizeof(*drvdata), GFP_KERNEL);
170 if (unlikely(!drvdata)) {
171 printk(KERN_ERR "%s: no memory for drvdata\n",
172 module_id);
173 return -ENOMEM;
174 }
175
176 /* bind private data into driver */
177 platform_set_drvdata(pdev, drvdata);
178
179 /* allocate and map the resource */
180 drvdata->regs =
181 excite_nand_map_regs(pdev, EXCITE_NANDFLASH_RESOURCE_REGS);
182
183 if (unlikely(!drvdata->regs)) {
184 printk(KERN_ERR "%s: cannot reserve register region\n",
185 module_id);
186 kfree(drvdata);
187 return -ENXIO;
188 }
189
190 drvdata->tgt = drvdata->regs + EXCITE_NANDFLASH_DATA_BYTE;
191
192 /* initialise our chip */
193 board_chip = &drvdata->board_chip;
194 board_chip->IO_ADDR_R = board_chip->IO_ADDR_W =
195 drvdata->regs + EXCITE_NANDFLASH_DATA_BYTE;
196 board_chip->cmd_ctrl = excite_nand_control;
197 board_chip->dev_ready = excite_nand_devready;
198 board_chip->chip_delay = 25;
199 board_chip->ecc.mode = NAND_ECC_SOFT;
200
201 /* link chip to mtd */
202 board_mtd = &drvdata->board_mtd;
203 board_mtd->priv = board_chip;
204
205 DEBUG(MTD_DEBUG_LEVEL2, "%s: device scan\n", module_id);
206 scan_res = nand_scan(&drvdata->board_mtd, 1);
207
208 if (likely(!scan_res)) {
209 DEBUG(MTD_DEBUG_LEVEL2, "%s: register partitions\n", module_id);
210 add_mtd_partitions(&drvdata->board_mtd, partition_info,
211 ARRAY_SIZE(partition_info));
212 } else {
213 iounmap(drvdata->regs);
214 kfree(drvdata);
215 printk(KERN_ERR "%s: device scan failed\n", module_id);
216 return -EIO;
217 }
218 return 0;
219 }
220
221 static struct platform_driver excite_nand_driver = {
222 .driver = {
223 .name = "excite_nand",
224 .owner = THIS_MODULE,
225 },
226 .probe = excite_nand_probe,
227 .remove = __devexit_p(excite_nand_remove)
228 };
229
230 static int __init excite_nand_init(void)
231 {
232 pr_info("Basler eXcite nand flash driver Version "
233 EXCITE_NANDFLASH_VERSION "\n");
234 return platform_driver_register(&excite_nand_driver);
235 }
236
237 static void __exit excite_nand_exit(void)
238 {
239 platform_driver_unregister(&excite_nand_driver);
240 }
241
242 module_init(excite_nand_init);
243 module_exit(excite_nand_exit);
244
245 MODULE_AUTHOR("Thomas Koeller <thomas.koeller@baslerweb.com>");
246 MODULE_DESCRIPTION("Basler eXcite NAND-Flash driver");
247 MODULE_LICENSE("GPL");
248 MODULE_VERSION(EXCITE_NANDFLASH_VERSION)
249
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