summaryrefslogtreecommitdiff
path: root/drivers/mtd/nand/raw/fsl_upm.c
blob: 5ccc28ec0985651cea6d12e5b94eab69966358f9 (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
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
/*
 * Freescale UPM NAND driver.
 *
 * Copyright © 2007-2008  MontaVista Software, Inc.
 *
 * Author: Anton Vorontsov <avorontsov@ru.mvista.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/kernel.h>
#include <linux/module.h>
#include <linux/delay.h>
#include <linux/mtd/rawnand.h>
#include <linux/mtd/nand_ecc.h>
#include <linux/mtd/partitions.h>
#include <linux/mtd/mtd.h>
#include <linux/of_address.h>
#include <linux/of_platform.h>
#include <linux/of_gpio.h>
#include <linux/io.h>
#include <linux/slab.h>
#include <asm/fsl_lbc.h>

#define FSL_UPM_WAIT_RUN_PATTERN  0x1
#define FSL_UPM_WAIT_WRITE_BYTE   0x2
#define FSL_UPM_WAIT_WRITE_BUFFER 0x4

struct fsl_upm_nand {
	struct device *dev;
	struct nand_chip chip;
	int last_ctrl;
	struct mtd_partition *parts;
	struct fsl_upm upm;
	uint8_t upm_addr_offset;
	uint8_t upm_cmd_offset;
	void __iomem *io_base;
	int rnb_gpio[NAND_MAX_CHIPS];
	uint32_t mchip_offsets[NAND_MAX_CHIPS];
	uint32_t mchip_count;
	uint32_t mchip_number;
	int chip_delay;
	uint32_t wait_flags;
};

static inline struct fsl_upm_nand *to_fsl_upm_nand(struct mtd_info *mtdinfo)
{
	return container_of(mtd_to_nand(mtdinfo), struct fsl_upm_nand,
			    chip);
}

static int fun_chip_ready(struct nand_chip *chip)
{
	struct fsl_upm_nand *fun = to_fsl_upm_nand(nand_to_mtd(chip));

	if (gpio_get_value(fun->rnb_gpio[fun->mchip_number]))
		return 1;

	dev_vdbg(fun->dev, "busy\n");
	return 0;
}

static void fun_wait_rnb(struct fsl_upm_nand *fun)
{
	if (fun->rnb_gpio[fun->mchip_number] >= 0) {
		struct mtd_info *mtd = nand_to_mtd(&fun->chip);
		int cnt = 1000000;

		while (--cnt && !fun_chip_ready(&fun->chip))
			cpu_relax();
		if (!cnt)
			dev_err(fun->dev, "tired waiting for RNB\n");
	} else {
		ndelay(100);
	}
}

static void fun_cmd_ctrl(struct nand_chip *chip, int cmd, unsigned int ctrl)
{
	struct fsl_upm_nand *fun = to_fsl_upm_nand(nand_to_mtd(chip));
	u32 mar;

	if (!(ctrl & fun->last_ctrl)) {
		fsl_upm_end_pattern(&fun->upm);

		if (cmd == NAND_CMD_NONE)
			return;

		fun->last_ctrl = ctrl & (NAND_ALE | NAND_CLE);
	}

	if (ctrl & NAND_CTRL_CHANGE) {
		if (ctrl & NAND_ALE)
			fsl_upm_start_pattern(&fun->upm, fun->upm_addr_offset);
		else if (ctrl & NAND_CLE)
			fsl_upm_start_pattern(&fun->upm, fun->upm_cmd_offset);
	}

	mar = (cmd << (32 - fun->upm.width)) |
		fun->mchip_offsets[fun->mchip_number];
	fsl_upm_run_pattern(&fun->upm, chip->legacy.IO_ADDR_R, mar);

	if (fun->wait_flags & FSL_UPM_WAIT_RUN_PATTERN)
		fun_wait_rnb(fun);
}

static void fun_select_chip(struct nand_chip *chip, int mchip_nr)
{
	struct fsl_upm_nand *fun = to_fsl_upm_nand(nand_to_mtd(chip));

	if (mchip_nr == -1) {
		chip->legacy.cmd_ctrl(chip, NAND_CMD_NONE, 0 | NAND_CTRL_CHANGE);
	} else if (mchip_nr >= 0 && mchip_nr < NAND_MAX_CHIPS) {
		fun->mchip_number = mchip_nr;
		chip->legacy.IO_ADDR_R = fun->io_base + fun->mchip_offsets[mchip_nr];
		chip->legacy.IO_ADDR_W = chip->legacy.IO_ADDR_R;
	} else {
		BUG();
	}
}

static uint8_t fun_read_byte(struct nand_chip *chip)
{
	struct fsl_upm_nand *fun = to_fsl_upm_nand(nand_to_mtd(chip));

	return in_8(fun->chip.legacy.IO_ADDR_R);
}

static void fun_read_buf(struct nand_chip *chip, uint8_t *buf, int len)
{
	struct fsl_upm_nand *fun = to_fsl_upm_nand(nand_to_mtd(chip));
	int i;

	for (i = 0; i < len; i++)
		buf[i] = in_8(fun->chip.legacy.IO_ADDR_R);
}

static void fun_write_buf(struct nand_chip *chip, const uint8_t *buf, int len)
{
	struct fsl_upm_nand *fun = to_fsl_upm_nand(nand_to_mtd(chip));
	int i;

	for (i = 0; i < len; i++) {
		out_8(fun->chip.legacy.IO_ADDR_W, buf[i]);
		if (fun->wait_flags & FSL_UPM_WAIT_WRITE_BYTE)
			fun_wait_rnb(fun);
	}
	if (fun->wait_flags & FSL_UPM_WAIT_WRITE_BUFFER)
		fun_wait_rnb(fun);
}

static int fun_chip_init(struct fsl_upm_nand *fun,
			 const struct device_node *upm_np,
			 const struct resource *io_res)
{
	struct mtd_info *mtd = nand_to_mtd(&fun->chip);
	int ret;
	struct device_node *flash_np;

	fun->chip.legacy.IO_ADDR_R = fun->io_base;
	fun->chip.legacy.IO_ADDR_W = fun->io_base;
	fun->chip.legacy.cmd_ctrl = fun_cmd_ctrl;
	fun->chip.legacy.chip_delay = fun->chip_delay;
	fun->chip.legacy.read_byte = fun_read_byte;
	fun->chip.legacy.read_buf = fun_read_buf;
	fun->chip.legacy.write_buf = fun_write_buf;
	fun->chip.ecc.mode = NAND_ECC_SOFT;
	fun->chip.ecc.algo = NAND_ECC_HAMMING;
	if (fun->mchip_count > 1)
		fun->chip.legacy.select_chip = fun_select_chip;

	if (fun->rnb_gpio[0] >= 0)
		fun->chip.legacy.dev_ready = fun_chip_ready;

	mtd->dev.parent = fun->dev;

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

	nand_set_flash_node(&fun->chip, flash_np);
	mtd->name = kasprintf(GFP_KERNEL, "0x%llx.%pOFn", (u64)io_res->start,
			      flash_np);
	if (!mtd->name) {
		ret = -ENOMEM;
		goto err;
	}

	ret = nand_scan(&fun->chip, fun->mchip_count);
	if (ret)
		goto err;

	ret = mtd_device_register(mtd, NULL, 0);
err:
	of_node_put(flash_np);
	if (ret)
		kfree(mtd->name);
	return ret;
}

static int fun_probe(struct platform_device *ofdev)
{
	struct fsl_upm_nand *fun;
	struct resource io_res;
	const __be32 *prop;
	int rnb_gpio;
	int ret;
	int size;
	int i;

	fun = kzalloc(sizeof(*fun), GFP_KERNEL);
	if (!fun)
		return -ENOMEM;

	ret = of_address_to_resource(ofdev->dev.of_node, 0, &io_res);
	if (ret) {
		dev_err(&ofdev->dev, "can't get IO base\n");
		goto err1;
	}

	ret = fsl_upm_find(io_res.start, &fun->upm);
	if (ret) {
		dev_err(&ofdev->dev, "can't find UPM\n");
		goto err1;
	}

	prop = of_get_property(ofdev->dev.of_node, "fsl,upm-addr-offset",
			       &size);
	if (!prop || size != sizeof(uint32_t)) {
		dev_err(&ofdev->dev, "can't get UPM address offset\n");
		ret = -EINVAL;
		goto err1;
	}
	fun->upm_addr_offset = *prop;

	prop = of_get_property(ofdev->dev.of_node, "fsl,upm-cmd-offset", &size);
	if (!prop || size != sizeof(uint32_t)) {
		dev_err(&ofdev->dev, "can't get UPM command offset\n");
		ret = -EINVAL;
		goto err1;
	}
	fun->upm_cmd_offset = *prop;

	prop = of_get_property(ofdev->dev.of_node,
			       "fsl,upm-addr-line-cs-offsets", &size);
	if (prop && (size / sizeof(uint32_t)) > 0) {
		fun->mchip_count = size / sizeof(uint32_t);
		if (fun->mchip_count >= NAND_MAX_CHIPS) {
			dev_err(&ofdev->dev, "too much multiple chips\n");
			goto err1;
		}
		for (i = 0; i < fun->mchip_count; i++)
			fun->mchip_offsets[i] = be32_to_cpu(prop[i]);
	} else {
		fun->mchip_count = 1;
	}

	for (i = 0; i < fun->mchip_count; i++) {
		fun->rnb_gpio[i] = -1;
		rnb_gpio = of_get_gpio(ofdev->dev.of_node, i);
		if (rnb_gpio >= 0) {
			ret = gpio_request(rnb_gpio, dev_name(&ofdev->dev));
			if (ret) {
				dev_err(&ofdev->dev,
					"can't request RNB gpio #%d\n", i);
				goto err2;
			}
			gpio_direction_input(rnb_gpio);
			fun->rnb_gpio[i] = rnb_gpio;
		} else if (rnb_gpio == -EINVAL) {
			dev_err(&ofdev->dev, "RNB gpio #%d is invalid\n", i);
			goto err2;
		}
	}

	prop = of_get_property(ofdev->dev.of_node, "chip-delay", NULL);
	if (prop)
		fun->chip_delay = be32_to_cpup(prop);
	else
		fun->chip_delay = 50;

	prop = of_get_property(ofdev->dev.of_node, "fsl,upm-wait-flags", &size);
	if (prop && size == sizeof(uint32_t))
		fun->wait_flags = be32_to_cpup(prop);
	else
		fun->wait_flags = FSL_UPM_WAIT_RUN_PATTERN |
				  FSL_UPM_WAIT_WRITE_BYTE;

	fun->io_base = devm_ioremap_nocache(&ofdev->dev, io_res.start,
					    resource_size(&io_res));
	if (!fun->io_base) {
		ret = -ENOMEM;
		goto err2;
	}

	fun->dev = &ofdev->dev;
	fun->last_ctrl = NAND_CLE;

	ret = fun_chip_init(fun, ofdev->dev.of_node, &io_res);
	if (ret)
		goto err2;

	dev_set_drvdata(&ofdev->dev, fun);

	return 0;
err2:
	for (i = 0; i < fun->mchip_count; i++) {
		if (fun->rnb_gpio[i] < 0)
			break;
		gpio_free(fun->rnb_gpio[i]);
	}
err1:
	kfree(fun);

	return ret;
}

static int fun_remove(struct platform_device *ofdev)
{
	struct fsl_upm_nand *fun = dev_get_drvdata(&ofdev->dev);
	struct mtd_info *mtd = nand_to_mtd(&fun->chip);
	int i;

	nand_release(&fun->chip);
	kfree(mtd->name);

	for (i = 0; i < fun->mchip_count; i++) {
		if (fun->rnb_gpio[i] < 0)
			break;
		gpio_free(fun->rnb_gpio[i]);
	}

	kfree(fun);

	return 0;
}

static const struct of_device_id of_fun_match[] = {
	{ .compatible = "fsl,upm-nand" },
	{},
};
MODULE_DEVICE_TABLE(of, of_fun_match);

static struct platform_driver of_fun_driver = {
	.driver = {
		.name = "fsl,upm-nand",
		.of_match_table = of_fun_match,
	},
	.probe		= fun_probe,
	.remove		= fun_remove,
};

module_platform_driver(of_fun_driver);

MODULE_LICENSE("GPL");
MODULE_AUTHOR("Anton Vorontsov <avorontsov@ru.mvista.com>");
MODULE_DESCRIPTION("Driver for NAND chips working through Freescale "
		   "LocalBus User-Programmable Machine");