aboutsummaryrefslogtreecommitdiff
path: root/drivers/mxc/mipi/mxc_mipi_csi2.c
blob: 89592a84745ca0ee00d5017002e495e379c30417 (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
362
363
364
365
366
367
368
/*
 * Copyright (C) 2011 Freescale Semiconductor, Inc. All Rights Reserved.
 *
 * 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.,
 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
 */

#include <linux/types.h>
#include <linux/init.h>
#include <linux/platform_device.h>
#include <linux/err.h>
#include <linux/clk.h>
#include <linux/console.h>
#include <linux/io.h>
#include <linux/bitops.h>
#include <linux/ipu.h>
#include <linux/mxcfb.h>
#include <linux/regulator/consumer.h>
#include <linux/backlight.h>
#include <linux/spinlock.h>
#include <linux/delay.h>
#include <linux/fsl_devices.h>

#include <mach/hardware.h>
#include <mach/clock.h>
#include <mach/mipi_csi2.h>

#include "mxc_mipi_csi2.h"

static struct mipi_csi2_info *gmipi_csi2;

static inline void mipi_csi2_write(struct mipi_csi2_info *info, unsigned value, unsigned offset)
{
	writel(value, info->mipi_csi2_base + offset);
}

static inline unsigned int mipi_csi2_read(struct mipi_csi2_info *info, unsigned offset)
{
	return readl(info->mipi_csi2_base + offset);
}

/*!
 * This function is called to set mipi lanes.
 *
 * @param	info		mipi csi2 hander
 * @return      Returns setted value
 */
unsigned int mipi_csi2_set_lanes(struct mipi_csi2_info *info)
{
	mipi_csi2_write(info, info->lanes - 1, CSI2_N_LANES);

	return mipi_csi2_read(info, CSI2_N_LANES);
}
EXPORT_SYMBOL(mipi_csi2_set_lanes);

/*!
 * This function is called to set mipi data type.
 *
 * @param	info		mipi csi2 hander
 * @return      Returns setted value
 */
unsigned int mipi_csi2_set_datatype(struct mipi_csi2_info *info,
										unsigned int datatype)
{
	info->datatype = datatype;

	return info->datatype;
}
EXPORT_SYMBOL(mipi_csi2_set_datatype);

/*!
 * This function is called to get mipi data type.
 *
 * @param	info		mipi csi2 hander
 * @return      Returns mipi data type
 */
unsigned int mipi_csi2_get_datatype(struct mipi_csi2_info *info)
{
	return info->datatype;
}
EXPORT_SYMBOL(mipi_csi2_get_datatype);

/*!
 * This function is called to get mipi csi2 dphy status.
 *
 * @param	info		mipi csi2 hander
 * @return      Returns dphy status
 */
unsigned int mipi_csi2_dphy_status(struct mipi_csi2_info *info)
{
	return mipi_csi2_read(info, CSI2_PHY_STATE);
}
EXPORT_SYMBOL(mipi_csi2_dphy_status);

/*!
 * This function is called to get mipi csi2 error1 status.
 *
 * @param	info		mipi csi2 hander
 * @return      Returns error1 value
 */
unsigned int mipi_csi2_get_error1(struct mipi_csi2_info *info)
{
	return mipi_csi2_read(info, CSI2_ERR1);
}
EXPORT_SYMBOL(mipi_csi2_get_error1);

/*!
 * This function is called to get mipi csi2 error1 status.
 *
 * @param	info		mipi csi2 hander
 * @return      Returns error1 value
 */
unsigned int mipi_csi2_get_error2(struct mipi_csi2_info *info)
{
	return mipi_csi2_read(info, CSI2_ERR2);
}
EXPORT_SYMBOL(mipi_csi2_get_error2);

/*!
 * This function is called to enable mipi to ipu pixel clock.
 *
 * @param	info		mipi csi2 hander
 * @return      Returns 0 on success or negative error code on fail
 */
int mipi_csi2_pixelclk_enable(struct mipi_csi2_info *info)
{
	return clk_enable(info->pixel_clk);
}
EXPORT_SYMBOL(mipi_csi2_pixelclk_enable);

/*!
 * This function is called to disable mipi to ipu pixel clock.
 *
 * @param	info		mipi csi2 hander
 * @return      Returns 0 on success or negative error code on fail
 */
void mipi_csi2_pixelclk_disable(struct mipi_csi2_info *info)
{
	clk_disable(info->pixel_clk);
}
EXPORT_SYMBOL(mipi_csi2_pixelclk_disable);

/*!
 * This function is called to power on mipi csi2.
 *
 * @param	info		mipi csi2 hander
 * @return      Returns 0 on success or negative error code on fail
 */
int mipi_csi2_reset(struct mipi_csi2_info *info)
{
	mipi_csi2_write(info, 0x0, CSI2_PHY_SHUTDOWNZ);
	mipi_csi2_write(info, 0x0, CSI2_DPHY_RSTZ);
	mipi_csi2_write(info, 0x0, CSI2_RESETN);

	mipi_csi2_write(info, 0x00000001, CSI2_PHY_TST_CTRL0);
	mipi_csi2_write(info, 0x00000000, CSI2_PHY_TST_CTRL1);
	mipi_csi2_write(info, 0x00000000, CSI2_PHY_TST_CTRL0);
	mipi_csi2_write(info, 0x00000002, CSI2_PHY_TST_CTRL0);
	mipi_csi2_write(info, 0x00010044, CSI2_PHY_TST_CTRL1);
	mipi_csi2_write(info, 0x00000000, CSI2_PHY_TST_CTRL0);
	mipi_csi2_write(info, 0x00000014, CSI2_PHY_TST_CTRL1);
	mipi_csi2_write(info, 0x00000002, CSI2_PHY_TST_CTRL0);
	mipi_csi2_write(info, 0x00000000, CSI2_PHY_TST_CTRL0);

	mipi_csi2_write(info, 0xffffffff, CSI2_PHY_SHUTDOWNZ);
	mipi_csi2_write(info, 0xffffffff, CSI2_DPHY_RSTZ);
	mipi_csi2_write(info, 0xffffffff, CSI2_RESETN);

	return 0;
}
EXPORT_SYMBOL(mipi_csi2_reset);

/*!
 * This function is called to get mipi csi2 info.
 *
 * @return      Returns mipi csi2 info struct pointor
 */
struct mipi_csi2_info *mipi_csi2_get_info(void)
{
	return gmipi_csi2;
}
EXPORT_SYMBOL(mipi_csi2_get_info);

/*!
 * This function is called to get mipi csi2 bind ipu num.
 *
 * @return      Returns mipi csi2 bind ipu num
 */
int mipi_csi2_get_bind_ipu(struct mipi_csi2_info *info)
{
	return info->ipu_id;
}
EXPORT_SYMBOL(mipi_csi2_get_bind_ipu);

/*!
 * This function is called to get mipi csi2 bind csi num.
 *
 * @return      Returns mipi csi2 bind csi num
 */
unsigned int mipi_csi2_get_bind_csi(struct mipi_csi2_info *info)
{
	return info->csi_id;
}
EXPORT_SYMBOL(mipi_csi2_get_bind_csi);

/*!
 * This function is called to get mipi csi2 virtual channel.
 *
 * @return      Returns mipi csi2 virtual channel num
 */
unsigned int mipi_csi2_get_virtual_channel(struct mipi_csi2_info *info)
{
	return info->v_channel;
}
EXPORT_SYMBOL(mipi_csi2_get_virtual_channel);

/**
 * This function is called by the driver framework to initialize the MIPI CSI2
 * device.
 *
 * @param	pdev	The device structure for the MIPI CSI2 passed in by the
 *			driver framework.
 *
 * @return      Returns 0 on success or negative error code on error
 */
static int mipi_csi2_probe(struct platform_device *pdev)
{
	struct mipi_csi2_platform_data *plat_data = pdev->dev.platform_data;
	struct resource *res;
	u32 mipi_csi2_dphy_ver;
	int ret;

	if ((plat_data->ipu_id < 0) || (plat_data->ipu_id > 1) ||
		(plat_data->csi_id > 1) || (plat_data->v_channel > 3) ||
		(plat_data->lanes > 4)) {
		dev_err(&pdev->dev, "invalid param for mimp csi2!\n");
		return -EINVAL;
	}

	gmipi_csi2 = kmalloc(sizeof(struct mipi_csi2_info), GFP_KERNEL);
	if (!gmipi_csi2) {
		ret = -ENOMEM;
		goto alloc_failed;
	}

	/* get mipi csi2 informaiton */
	gmipi_csi2->pdev = pdev;
	gmipi_csi2->ipu_id = plat_data->ipu_id;
	gmipi_csi2->csi_id = plat_data->csi_id;
	gmipi_csi2->v_channel = plat_data->v_channel;
	gmipi_csi2->lanes = plat_data->lanes;

	/* get mipi dphy clk */
	gmipi_csi2->dphy_clk = clk_get(&pdev->dev, plat_data->dphy_clk);
	if (IS_ERR(gmipi_csi2->dphy_clk)) {
		dev_err(&pdev->dev, "failed to get dphy pll_ref_clk\n");
		ret = PTR_ERR(gmipi_csi2->dphy_clk);
		goto err_clk1;
	}

	/* get mipi to ipu pixel clk */
	gmipi_csi2->pixel_clk = clk_get(&pdev->dev, plat_data->pixel_clk);
	if (IS_ERR(gmipi_csi2->pixel_clk)) {
		dev_err(&pdev->dev, "failed to get mipi pixel clk\n");
		ret = PTR_ERR(gmipi_csi2->pixel_clk);
		goto err_clk2;
	}

	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	if (!res) {
		ret = -ENODEV;
		goto failed_get_res;
	}

	/* mipi register mapping */
	gmipi_csi2->mipi_csi2_base = ioremap(res->start, PAGE_SIZE);
	if (!gmipi_csi2->mipi_csi2_base) {
		ret = -ENOMEM;
		goto failed_ioremap;
	}

	/* mipi dphy clk enable for register access */
	clk_enable(gmipi_csi2->dphy_clk);
	/* get mipi csi2 dphy version */
	mipi_csi2_dphy_ver = mipi_csi2_read(gmipi_csi2, CSI2_VERSION);

	platform_set_drvdata(pdev, gmipi_csi2);

	dev_info(&pdev->dev, "i.MX MIPI CSI2 driver probed\n");
	dev_info(&pdev->dev, "i.MX MIPI CSI2 dphy version is 0x%x\n",
						mipi_csi2_dphy_ver);

	return 0;

failed_ioremap:
failed_get_res:
	clk_put(gmipi_csi2->pixel_clk);
err_clk2:
	clk_put(gmipi_csi2->dphy_clk);
err_clk1:
	kfree(gmipi_csi2);
alloc_failed:
	return ret;
}

static int __devexit mipi_csi2_remove(struct platform_device *pdev)
{
	/* unmapping mipi register */
	iounmap(gmipi_csi2->mipi_csi2_base);

	/* disable mipi dphy clk */
	clk_disable(gmipi_csi2->dphy_clk);
	clk_put(gmipi_csi2->dphy_clk);

	clk_put(gmipi_csi2->pixel_clk);

	kfree(gmipi_csi2);

	dev_set_drvdata(&pdev->dev, NULL);

	return 0;
}

static struct platform_driver mipi_csi2_driver = {
	.driver = {
		   .name = "mxc_mipi_csi2",
	},
	.probe = mipi_csi2_probe,
	.remove = __devexit_p(mipi_csi2_remove),
};

static int __init mipi_csi2_init(void)
{
	int err;

	err = platform_driver_register(&mipi_csi2_driver);
	if (err) {
		pr_err("mipi_csi2_driver register failed\n");
		return -ENODEV;
	}

	pr_info("MIPI CSI2 driver module loaded\n");

	return 0;
}

static void __exit mipi_csi2_cleanup(void)
{
	platform_driver_unregister(&mipi_csi2_driver);
}

module_init(mipi_csi2_init);
module_exit(mipi_csi2_cleanup);

MODULE_AUTHOR("Freescale Semiconductor, Inc.");
MODULE_DESCRIPTION("i.MX MIPI CSI2 driver");
MODULE_LICENSE("GPL");