aboutsummaryrefslogtreecommitdiff
path: root/arch/mips/basler/excite/excite_flashtest.c
blob: f0024a8e3294e6cd30cf1bcd85637eca467262c0 (plain)
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
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
/*
*  Copyright (C) 2005 by Basler Vision Technologies AG
*  Author: Thies Moeller <thies.moeller@baslerweb.com>
*
*  This program is free software; you can redistribute it and/or modify
*  it under the terms of the GNU General Public License as published by
*  the Free Software Foundation; either version 2 of the License, or
*  (at your option) any later version.
*
*  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
*/

#include <linux/module.h>
#include <linux/types.h>
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/string.h>
#include <linux/ioport.h>
#include <linux/device.h>
#include <linux/delay.h>
#include <linux/err.h>
#include <linux/kernel.h>

#include <excite.h>

#include <asm/io.h>

#include <linux/mtd/mtd.h>
#include <linux/mtd/nand.h>
#include <linux/mtd/nand_ecc.h>
#include <linux/mtd/partitions.h>
#include <asm/rm9k-ocd.h> // for ocd_write
#include <linux/workqueue.h> // for queue

#include "excite_nandflash.h"
#include "nandflash.h"

#define PFX "excite flashtest: "
typedef void __iomem *io_reg_t;

#define io_readb(__a__)		__raw_readb((__a__))
#define io_writeb(__v__, __a__)	__raw_writeb((__v__), (__a__))



static inline const struct resource *excite_nandflash_get_resource(
	struct platform_device *d, unsigned long flags, const char *basename)
{
	const char fmt[] = "%s_%u";
	char buf[80];

	if (unlikely(snprintf(buf, sizeof buf, fmt, basename, d->id) >= sizeof buf))
		return NULL;

	return platform_get_resource_byname(d, flags, buf);
}

static inline io_reg_t
excite_nandflash_map_regs(struct platform_device *d, const char *basename)
{
	void *result = NULL;
	const struct resource *const r =
	    excite_nandflash_get_resource(d, IORESOURCE_MEM, basename);
	if (r)
	   result = ioremap_nocache(r->start, r->end + 1 - r->start);
	return result;
}

/* controller and mtd information */

struct excite_nandflash_drvdata {
	struct mtd_info board_mtd;
	struct nand_chip board_chip;
	io_reg_t regs;
};


/* command and control functions */
static void excite_nandflash_hwcontrol(struct mtd_info *mtd, int cmd)
{
	struct nand_chip *this = mtd->priv;
	io_reg_t regs = container_of(mtd,struct excite_nandflash_drvdata,board_mtd)->regs;

	switch (cmd) {
	/* Select the command latch */
	case NAND_CTL_SETCLE: this->IO_ADDR_W = regs + EXCITE_NANDFLASH_CMD;
		break;
	/* Deselect the command latch */
	case NAND_CTL_CLRCLE: this->IO_ADDR_W = regs + EXCITE_NANDFLASH_DATA;
		break;
	/* Select the address latch */
	case NAND_CTL_SETALE: this->IO_ADDR_W = regs + EXCITE_NANDFLASH_ADDR;
		break;
	/* Deselect the address latch */
	case NAND_CTL_CLRALE: this->IO_ADDR_W = regs  + EXCITE_NANDFLASH_DATA;
		break;
	/* Select the chip  -- not used */
	case NAND_CTL_SETNCE:
		break;
	/* Deselect the chip -- not used */
	case NAND_CTL_CLRNCE:
		break;
	}

	this->IO_ADDR_R = this->IO_ADDR_W;
}

/* excite_nandflash_devready()
 *
 * returns 0 if the nand is busy, 1 if it is ready
 */
static int excite_nandflash_devready(struct mtd_info *mtd)
{
	struct excite_nandflash_drvdata *drvdata =
	    container_of(mtd, struct excite_nandflash_drvdata, board_mtd);

	return io_readb(drvdata->regs + EXCITE_NANDFLASH_STATUS);
}

/* device management functions */

/* excite_nandflash_remove
 *
 * called by device layer to remove the driver
 * the binding to the mtd and all allocated
 * resources are released
 */
static int excite_nandflash_remove(struct device *dev)
{
	struct excite_nandflash_drvdata *this = dev_get_drvdata(dev);

	pr_info(PFX "remove");

	dev_set_drvdata(dev, NULL);

	if (this == NULL) {
		pr_debug(PFX "call remove without private data!!");
		return 0;
	}


	/* free the common resources */
	if (this->regs != NULL) {
		iounmap(this->regs);
		this->regs = NULL;
	}

	kfree(this);

	return 0;
}

static int elapsed;

void my_workqueue_handler(void *arg)
{
	elapsed = 1;
}

DECLARE_WORK(sigElapsed, my_workqueue_handler, 0);


/* excite_nandflash_probe
 *
 * called by device layer when it finds a device matching
 * one our driver can handled. This code checks to see if
 * it can allocate all necessary resources then calls the
 * nand layer to look for devices
*/
static int excite_nandflash_probe(struct device *dev)
{
	struct platform_device *pdev = to_platform_device(dev);

	struct excite_nandflash_drvdata *drvdata;	    /* private driver data     */
	struct nand_chip              *board_chip;  /* private flash chip data */
	struct mtd_info               *board_mtd;   /* mtd info for this board */

	int err      = 0;
	int count    = 0;
	struct timeval tv,endtv;
	unsigned int dt;

	pr_info(PFX "probe dev: (%p)\n", dev);

	pr_info(PFX "adjust LB timing\n");
	ocd_writel(0x00000330, LDP2);

	drvdata = kmalloc(sizeof(*drvdata), GFP_KERNEL);
	if (unlikely(!drvdata)) {
		printk(KERN_ERR PFX "no memory for drvdata\n");
		err = -ENOMEM;
		goto mem_error;
	}

	/* Initialize structures */
	memset(drvdata, 0, sizeof(*drvdata));

	/* bind private data into driver */
	dev_set_drvdata(dev, drvdata);

	/* allocate and map the resource */
	drvdata->regs =
	    excite_nandflash_map_regs(pdev, EXCITE_NANDFLASH_RESOURCE_REGS);

	if (unlikely(!drvdata->regs)) {
		printk(KERN_ERR PFX "cannot reserve register region\n");
		err = -ENXIO;
		goto io_error;
	}

	/* initialise our chip */
	board_chip = &drvdata->board_chip;

	board_chip->IO_ADDR_R = drvdata->regs + EXCITE_NANDFLASH_DATA;
	board_chip->IO_ADDR_W = drvdata->regs + EXCITE_NANDFLASH_DATA;

	board_chip->hwcontrol = excite_nandflash_hwcontrol;
	board_chip->dev_ready = excite_nandflash_devready;

	board_chip->chip_delay = 25;
	#if 0
	/* TODO: speedup the initial scan */
	board_chip->options = NAND_USE_FLASH_BBT;
	#endif
	board_chip->eccmode = NAND_ECC_SOFT;

	/* link chip to mtd */
	board_mtd = &drvdata->board_mtd;
	board_mtd->priv = board_chip;


	pr_info(PFX "FlashTest\n");
	elapsed = 0;
/*	schedule_delayed_work(&sigElapsed, 1*HZ);
	while (!elapsed) {
		io_readb(drvdata->regs + EXCITE_NANDFLASH_STATUS);
		count++;
	}
	pr_info(PFX "reads in 1 sec --> %d\n",count);
*/
	do_gettimeofday(&tv);
	for (count = 0 ; count < 1000000; count ++) {
		io_readb(drvdata->regs + EXCITE_NANDFLASH_STATUS);
	}
	do_gettimeofday(&endtv);
	dt = (endtv.tv_sec - tv.tv_sec) * 1000000 + endtv.tv_usec  - tv.tv_usec;
	pr_info(PFX "%8d us timeval\n",dt);
	pr_info(PFX "EndFlashTest\n");

/*      return with error to unload everything
*/
io_error:
	iounmap(drvdata->regs);

mem_error:
	kfree(drvdata);

	if (err == 0)
		err = -EINVAL;
	return err;
}

static struct device_driver excite_nandflash_driver = {
	.name = "excite_nand",
	.bus = &platform_bus_type,
	.probe = excite_nandflash_probe,
	.remove = excite_nandflash_remove,
};

static int __init excite_nandflash_init(void)
{
	pr_info(PFX "register Driver (Rev: $Revision:$)\n");
	return driver_register(&excite_nandflash_driver);
}

static void __exit excite_nandflash_exit(void)
{
	driver_unregister(&excite_nandflash_driver);
	pr_info(PFX "Driver unregistered");
}

module_init(excite_nandflash_init);
module_exit(excite_nandflash_exit);

MODULE_AUTHOR("Thies Moeller <thies.moeller@baslerweb.com>");
MODULE_DESCRIPTION("Basler eXcite NAND-Flash driver");
MODULE_LICENSE("GPL");