summaryrefslogtreecommitdiffstats
path: root/drivers/mtd/nand/ndfc.c
blob: fe8d38514ba655ce79e8b4bc788726a5e6e060d5 (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
/*
 *  drivers/mtd/ndfc.c
 *
 *  Overview:
 *   Platform independend driver for NDFC (NanD Flash Controller)
 *   integrated into EP440 cores
 *
 *  Author: Thomas Gleixner
 *
 *  Copyright 2006 IBM
 *
 *  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/mtd/mtd.h>
#include <linux/platform_device.h>

#include <asm/io.h>
#include <asm/ibm44x.h>

struct ndfc_nand_mtd {
	struct mtd_info			mtd;
	struct nand_chip		chip;
	struct platform_nand_chip	*pl_chip;
};

static struct ndfc_nand_mtd ndfc_mtd[NDFC_MAX_BANKS];

struct ndfc_controller {
	void __iomem		*ndfcbase;
	struct nand_hw_control	ndfc_control;
	atomic_t		childs_active;
};

static struct ndfc_controller ndfc_ctrl;

static void ndfc_select_chip(struct mtd_info *mtd, int chip)
{
	uint32_t ccr;
	struct ndfc_controller *ndfc = &ndfc_ctrl;
	struct nand_chip *nandchip = mtd->priv;
	struct ndfc_nand_mtd *nandmtd = nandchip->priv;
	struct platform_nand_chip *pchip = nandmtd->pl_chip;

	ccr = __raw_readl(ndfc->ndfcbase + NDFC_CCR);
	if (chip >= 0) {
		ccr &= ~NDFC_CCR_BS_MASK;
		ccr |= NDFC_CCR_BS(chip + pchip->chip_offset);
	} else
		ccr |= NDFC_CCR_RESET_CE;
	writel(ccr, ndfc->ndfcbase + NDFC_CCR);
}

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

	if (cmd == NAND_CMD_NONE)
		return;

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

static int ndfc_ready(struct mtd_info *mtd)
{
	struct ndfc_controller *ndfc = &ndfc_ctrl;

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

static void ndfc_enable_hwecc(struct mtd_info *mtd, int mode)
{
	uint32_t ccr;
	struct ndfc_controller *ndfc = &ndfc_ctrl;

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

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

	wmb();
	ecc = __raw_readl(ndfc->ndfcbase + NDFC_ECC);
	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 ndfc_controller *ndfc = &ndfc_ctrl;
	uint32_t *p = (uint32_t *) buf;

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

static void ndfc_write_buf(struct mtd_info *mtd, const uint8_t *buf, int len)
{
	struct ndfc_controller *ndfc = &ndfc_ctrl;
	uint32_t *p = (uint32_t *) buf;

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

static int ndfc_verify_buf(struct mtd_info *mtd, const uint8_t *buf, int len)
{
	struct ndfc_controller *ndfc = &ndfc_ctrl;
	uint32_t *p = (uint32_t *) buf;

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

/*
 * Initialize chip structure
 */
static void ndfc_chip_init(struct ndfc_nand_mtd *mtd)
{
	struct ndfc_controller *ndfc = &ndfc_ctrl;
	struct nand_chip *chip = &mtd->chip;

	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->priv = mtd;
	chip->options = mtd->pl_chip->options;
	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->ecclayout = mtd->pl_chip->ecclayout;
	mtd->mtd.priv = chip;
	mtd->mtd.owner = THIS_MODULE;
}

static int ndfc_chip_probe(struct platform_device *pdev)
{
	struct platform_nand_chip *nc = pdev->dev.platform_data;
	struct ndfc_chip_settings *settings = nc->priv;
	struct ndfc_controller *ndfc = &ndfc_ctrl;
	struct ndfc_nand_mtd *nandmtd;

	if (nc->chip_offset >= NDFC_MAX_BANKS || nc->nr_chips > NDFC_MAX_BANKS)
		return -EINVAL;

	/* Set the bank settings */
	__raw_writel(settings->bank_settings,
		     ndfc->ndfcbase + NDFC_BCFG0 + (nc->chip_offset << 2));

	nandmtd = &ndfc_mtd[pdev->id];
	if (nandmtd->pl_chip)
		return -EBUSY;

	nandmtd->pl_chip = nc;
	ndfc_chip_init(nandmtd);

	/* Scan for chips */
	if (nand_scan(&nandmtd->mtd, nc->nr_chips)) {
		nandmtd->pl_chip = NULL;
		return -ENODEV;
	}

#ifdef CONFIG_MTD_PARTITIONS
	printk("Number of partitions %d\n", nc->nr_partitions);
	if (nc->nr_partitions) {
		/* Add the full device, so complete dumps can be made */
		add_mtd_device(&nandmtd->mtd);
		add_mtd_partitions(&nandmtd->mtd, nc->partitions,
				   nc->nr_partitions);

	} else
#else
		add_mtd_device(&nandmtd->mtd);
#endif

	atomic_inc(&ndfc->childs_active);
	return 0;
}

static int ndfc_chip_remove(struct platform_device *pdev)
{
	return 0;
}

static int ndfc_nand_probe(struct platform_device *pdev)
{
	struct platform_nand_ctrl *nc = pdev->dev.platform_data;
	struct ndfc_controller_settings *settings = nc->priv;
	struct resource *res = pdev->resource;
	struct ndfc_controller *ndfc = &ndfc_ctrl;
	unsigned long long phys = settings->ndfc_erpn | res->start;

	ndfc->ndfcbase = ioremap64(phys, res->end - res->start + 1);
	if (!ndfc->ndfcbase) {
		printk(KERN_ERR "NDFC: ioremap failed\n");
		return -EIO;
	}

	__raw_writel(settings->ccr_settings, ndfc->ndfcbase + NDFC_CCR);

	spin_lock_init(&ndfc->ndfc_control.lock);
	init_waitqueue_head(&ndfc->ndfc_control.wq);

	platform_set_drvdata(pdev, ndfc);

	printk("NDFC NAND Driver initialized. Chip-Rev: 0x%08x\n",
	       __raw_readl(ndfc->ndfcbase + NDFC_REVID));

	return 0;
}

static int ndfc_nand_remove(struct platform_device *pdev)
{
	struct ndfc_controller *ndfc = platform_get_drvdata(pdev);

	if (atomic_read(&ndfc->childs_active))
		return -EBUSY;

	if (ndfc) {
		platform_set_drvdata(pdev, NULL);
		iounmap(ndfc_ctrl.ndfcbase);
		ndfc_ctrl.ndfcbase = NULL;
	}
	return 0;
}

/* driver device registration */

static struct platform_driver ndfc_chip_driver = {
	.probe		= ndfc_chip_probe,
	.remove		= ndfc_chip_remove,
	.driver		= {
		.name	= "ndfc-chip",
		.owner	= THIS_MODULE,
	},
};

static struct platform_driver ndfc_nand_driver = {
	.probe		= ndfc_nand_probe,
	.remove		= ndfc_nand_remove,
	.driver		= {
		.name	= "ndfc-nand",
		.owner	= THIS_MODULE,
	},
};

static int __init ndfc_nand_init(void)
{
	int ret;

	spin_lock_init(&ndfc_ctrl.ndfc_control.lock);
	init_waitqueue_head(&ndfc_ctrl.ndfc_control.wq);

	ret = platform_driver_register(&ndfc_nand_driver);
	if (!ret)
		ret = platform_driver_register(&ndfc_chip_driver);
	return ret;
}

static void __exit ndfc_nand_exit(void)
{
	platform_driver_unregister(&ndfc_chip_driver);
	platform_driver_unregister(&ndfc_nand_driver);
}

module_init(ndfc_nand_init);
module_exit(ndfc_nand_exit);

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