aboutsummaryrefslogtreecommitdiff
path: root/drivers/mtd/nand/ndfc.c
blob: ee1713907b92b0684a64de524ca564214699f705 (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
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
/*
 *  drivers/mtd/ndfc.c
 *
 *  Overview:
 *   Platform independent driver for NDFC (NanD Flash Controller)
 *   integrated into EP440 cores
 *
 *   Ported to an OF platform driver by Sean MacLennan
 *
 *   The NDFC supports multiple chips, but this driver only supports a
 *   single chip since I do not have access to any boards with
 *   multiple chips.
 *
 *  Author: Thomas Gleixner
 *
 *  Copyright 2006 IBM
 *  Copyright 2008 PIKA Technologies
 *    Sean MacLennan <smaclennan@pikatech.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.
 *
 */
#include <linux/module.h>
#include <linux/mtd/nand.h>
#include <linux/mtd/nand_ecc.h>
#include <linux/mtd/partitions.h>
#include <linux/mtd/ndfc.h>
#include <linux/slab.h>
#include <linux/mtd/mtd.h>
#include <linux/of_platform.h>
#include <asm/io.h>

#define NDFC_MAX_CS    4

struct ndfc_controller {
	struct platform_device *ofdev;
	void __iomem *ndfcbase;
	struct mtd_info mtd;
	struct nand_chip chip;
	int chip_select;
	struct nand_hw_control ndfc_control;
};

static struct ndfc_controller ndfc_ctrl[NDFC_MAX_CS];

static void ndfc_select_chip(struct mtd_info *mtd, int chip)
{
	uint32_t ccr;
	struct nand_chip *nchip = mtd->priv;
	struct ndfc_controller *ndfc = nchip->priv;

	ccr = in_be32(ndfc->ndfcbase + NDFC_CCR);
	if (chip >= 0) {
		ccr &= ~NDFC_CCR_BS_MASK;
		ccr |= NDFC_CCR_BS(chip + ndfc->chip_select);
	} else
		ccr |= NDFC_CCR_RESET_CE;
	out_be32(ndfc->ndfcbase + NDFC_CCR, ccr);
}

static void ndfc_hwcontrol(struct mtd_info *mtd, int cmd, unsigned int ctrl)
{
	struct nand_chip *chip = mtd->priv;
	struct ndfc_controller *ndfc = chip->priv;

	if (cmd == NAND_CMD_NONE)
		return;

	if (ctrl & NAND_CLE)
		writel(cmd & 0xFF, ndfc->ndfcbase + NDFC_CMD);
	else
		writel(cmd & 0xFF, ndfc->ndfcbase + NDFC_ALE);
}

static int ndfc_ready(struct mtd_info *mtd)
{
	struct nand_chip *chip = mtd->priv;
	struct ndfc_controller *ndfc = chip->priv;

	return in_be32(ndfc->ndfcbase + NDFC_STAT) & NDFC_STAT_IS_READY;
}

static void ndfc_enable_hwecc(struct mtd_info *mtd, int mode)
{
	uint32_t ccr;
	struct nand_chip *chip = mtd->priv;
	struct ndfc_controller *ndfc = chip->priv;

	ccr = in_be32(ndfc->ndfcbase + NDFC_CCR);
	ccr |= NDFC_CCR_RESET_ECC;
	out_be32(ndfc->ndfcbase + NDFC_CCR, ccr);
	wmb();
}

static int ndfc_calculate_ecc(struct mtd_info *mtd,
			      const u_char *dat, u_char *ecc_code)
{
	struct nand_chip *chip = mtd->priv;
	struct ndfc_controller *ndfc = chip->priv;
	uint32_t ecc;
	uint8_t *p = (uint8_t *)&ecc;

	wmb();
	ecc = in_be32(ndfc->ndfcbase + NDFC_ECC);
	/* The NDFC uses Smart Media (SMC) bytes order */
	ecc_code[0] = p[1];
	ecc_code[1] = p[2];
	ecc_code[2] = p[3];

	return 0;
}

/*
 * Speedups for buffer read/write/verify
 *
 * NDFC allows 32bit read/write of data. So we can speed up the buffer
 * functions. No further checking, as nand_base will always read/write
 * page aligned.
 */
static void ndfc_read_buf(struct mtd_info *mtd, uint8_t *buf, int len)
{
	struct nand_chip *chip = mtd->priv;
	struct ndfc_controller *ndfc = chip->priv;
	uint32_t *p = (uint32_t *) buf;

	for(;len > 0; len -= 4)
		*p++ = in_be32(ndfc->ndfcbase + NDFC_DATA);
}

static void ndfc_write_buf(struct mtd_info *mtd, const uint8_t *buf, int len)
{
	struct nand_chip *chip = mtd->priv;
	struct ndfc_controller *ndfc = chip->priv;
	uint32_t *p = (uint32_t *) buf;

	for(;len > 0; len -= 4)
		out_be32(ndfc->ndfcbase + NDFC_DATA, *p++);
}

static int ndfc_verify_buf(struct mtd_info *mtd, const uint8_t *buf, int len)
{
	struct nand_chip *chip = mtd->priv;
	struct ndfc_controller *ndfc = chip->priv;
	uint32_t *p = (uint32_t *) buf;

	for(;len > 0; len -= 4)
		if (*p++ != in_be32(ndfc->ndfcbase + NDFC_DATA))
			return -EFAULT;
	return 0;
}

/*
 * Initialize chip structure
 */
static int ndfc_chip_init(struct ndfc_controller *ndfc,
			  struct device_node *node)
{
	struct device_node *flash_np;
	struct nand_chip *chip = &ndfc->chip;
	struct mtd_part_parser_data ppdata;
	int ret;

	chip->IO_ADDR_R = ndfc->ndfcbase + NDFC_DATA;
	chip->IO_ADDR_W = ndfc->ndfcbase + NDFC_DATA;
	chip->cmd_ctrl = ndfc_hwcontrol;
	chip->dev_ready = ndfc_ready;
	chip->select_chip = ndfc_select_chip;
	chip->chip_delay = 50;
	chip->controller = &ndfc->ndfc_control;
	chip->read_buf = ndfc_read_buf;
	chip->write_buf = ndfc_write_buf;
	chip->verify_buf = ndfc_verify_buf;
	chip->ecc.correct = nand_correct_data;
	chip->ecc.hwctl = ndfc_enable_hwecc;
	chip->ecc.calculate = ndfc_calculate_ecc;
	chip->ecc.mode = NAND_ECC_HW;
	chip->ecc.size = 256;
	chip->ecc.bytes = 3;
	chip->priv = ndfc;

	ndfc->mtd.priv = chip;
	ndfc->mtd.owner = THIS_MODULE;

	flash_np = of_get_next_child(node, NULL);
	if (!flash_np)
		return -ENODEV;

	ppdata->of_node = flash_np;
	ndfc->mtd.name = kasprintf(GFP_KERNEL, "%s.%s",
			dev_name(&ndfc->ofdev->dev), flash_np->name);
	if (!ndfc->mtd.name) {
		ret = -ENOMEM;
		goto err;
	}

	ret = nand_scan(&ndfc->mtd, 1);
	if (ret)
		goto err;

	ret = mtd_device_parse_register(&ndfc->mtd, NULL, &ppdata, NULL, 0);

err:
	of_node_put(flash_np);
	if (ret)
		kfree(ndfc->mtd.name);
	return ret;
}

static int __devinit ndfc_probe(struct platform_device *ofdev)
{
	struct ndfc_controller *ndfc;
	const __be32 *reg;
	u32 ccr;
	int err, len, cs;

	/* Read the reg property to get the chip select */
	reg = of_get_property(ofdev->dev.of_node, "reg", &len);
	if (reg == NULL || len != 12) {
		dev_err(&ofdev->dev, "unable read reg property (%d)\n", len);
		return -ENOENT;
	}

	cs = be32_to_cpu(reg[0]);
	if (cs >= NDFC_MAX_CS) {
		dev_err(&ofdev->dev, "invalid CS number (%d)\n", cs);
		return -EINVAL;
	}

	ndfc = &ndfc_ctrl[cs];
	ndfc->chip_select = cs;

	spin_lock_init(&ndfc->ndfc_control.lock);
	init_waitqueue_head(&ndfc->ndfc_control.wq);
	ndfc->ofdev = ofdev;
	dev_set_drvdata(&ofdev->dev, ndfc);

	ndfc->ndfcbase = of_iomap(ofdev->dev.of_node, 0);
	if (!ndfc->ndfcbase) {
		dev_err(&ofdev->dev, "failed to get memory\n");
		return -EIO;
	}

	ccr = NDFC_CCR_BS(ndfc->chip_select);

	/* It is ok if ccr does not exist - just default to 0 */
	reg = of_get_property(ofdev->dev.of_node, "ccr", NULL);
	if (reg)
		ccr |= be32_to_cpup(reg);

	out_be32(ndfc->ndfcbase + NDFC_CCR, ccr);

	/* Set the bank settings if given */
	reg = of_get_property(ofdev->dev.of_node, "bank-settings", NULL);
	if (reg) {
		int offset = NDFC_BCFG0 + (ndfc->chip_select << 2);
		out_be32(ndfc->ndfcbase + offset, be32_to_cpup(reg));
	}

	err = ndfc_chip_init(ndfc, ofdev->dev.of_node);
	if (err) {
		iounmap(ndfc->ndfcbase);
		return err;
	}

	return 0;
}

static int __devexit ndfc_remove(struct platform_device *ofdev)
{
	struct ndfc_controller *ndfc = dev_get_drvdata(&ofdev->dev);

	nand_release(&ndfc->mtd);
	kfree(ndfc->mtd.name);

	return 0;
}

static const struct of_device_id ndfc_match[] = {
	{ .compatible = "ibm,ndfc", },
	{}
};
MODULE_DEVICE_TABLE(of, ndfc_match);

static struct platform_driver ndfc_driver = {
	.driver = {
		.name = "ndfc",
		.owner = THIS_MODULE,
		.of_match_table = ndfc_match,
	},
	.probe = ndfc_probe,
	.remove = __devexit_p(ndfc_remove),
};

static int __init ndfc_nand_init(void)
{
	return platform_driver_register(&ndfc_driver);
}

static void __exit ndfc_nand_exit(void)
{
	platform_driver_unregister(&ndfc_driver);
}

module_init(ndfc_nand_init);
module_exit(ndfc_nand_exit);

MODULE_LICENSE("GPL");
MODULE_AUTHOR("Thomas Gleixner <tglx@linutronix.de>");
MODULE_DESCRIPTION("OF Platform driver for NDFC");