aboutsummaryrefslogtreecommitdiffstats
path: root/drivers/media/video/davinci/vpss.c
blob: 7ee72ecd3d81baea218dec5b41ab963f9978b3c4 (plain) (blame)
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
/*
 * Copyright (C) 2009 Texas Instruments.
 *
 * 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., 675 Mass Ave, Cambridge, MA 02139, USA.
 *
 * common vpss driver for all video drivers.
 */
#include <linux/kernel.h>
#include <linux/sched.h>
#include <linux/init.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/spinlock.h>
#include <linux/compiler.h>
#include <linux/io.h>
#include <mach/hardware.h>
#include <media/davinci/vpss.h>

MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("VPSS Driver");
MODULE_AUTHOR("Texas Instruments");

/* DM644x defines */
#define DM644X_SBL_PCR_VPSS		(4)

/* vpss BL register offsets */
#define DM355_VPSSBL_CCDCMUX		0x1c
/* vpss CLK register offsets */
#define DM355_VPSSCLK_CLKCTRL		0x04
/* masks and shifts */
#define VPSS_HSSISEL_SHIFT		4

/*
 * vpss operations. Depends on platform. Not all functions are available
 * on all platforms. The api, first check if a functio is available before
 * invoking it. In the probe, the function ptrs are intialized based on
 * vpss name. vpss name can be "dm355_vpss", "dm644x_vpss" etc.
 */
struct vpss_hw_ops {
	/* enable clock */
	int (*enable_clock)(enum vpss_clock_sel clock_sel, int en);
	/* select input to ccdc */
	void (*select_ccdc_source)(enum vpss_ccdc_source_sel src_sel);
	/* clear wbl overflow bit */
	int (*clear_wbl_overflow)(enum vpss_wbl_sel wbl_sel);
};

/* vpss configuration */
struct vpss_oper_config {
	__iomem void *vpss_bl_regs_base;
	__iomem void *vpss_regs_base;
	struct resource		*r1;
	resource_size_t		len1;
	struct resource		*r2;
	resource_size_t		len2;
	char vpss_name[32];
	spinlock_t vpss_lock;
	struct vpss_hw_ops hw_ops;
};

static struct vpss_oper_config oper_cfg;

/* register access routines */
static inline u32 bl_regr(u32 offset)
{
	return __raw_readl(oper_cfg.vpss_bl_regs_base + offset);
}

static inline void bl_regw(u32 val, u32 offset)
{
	__raw_writel(val, oper_cfg.vpss_bl_regs_base + offset);
}

static inline u32 vpss_regr(u32 offset)
{
	return __raw_readl(oper_cfg.vpss_regs_base + offset);
}

static inline void vpss_regw(u32 val, u32 offset)
{
	__raw_writel(val, oper_cfg.vpss_regs_base + offset);
}

static void dm355_select_ccdc_source(enum vpss_ccdc_source_sel src_sel)
{
	bl_regw(src_sel << VPSS_HSSISEL_SHIFT, DM355_VPSSBL_CCDCMUX);
}

int vpss_select_ccdc_source(enum vpss_ccdc_source_sel src_sel)
{
	if (!oper_cfg.hw_ops.select_ccdc_source)
		return -1;

	dm355_select_ccdc_source(src_sel);
	return 0;
}
EXPORT_SYMBOL(vpss_select_ccdc_source);

static int dm644x_clear_wbl_overflow(enum vpss_wbl_sel wbl_sel)
{
	u32 mask = 1, val;

	if (wbl_sel < VPSS_PCR_AEW_WBL_0 ||
	    wbl_sel > VPSS_PCR_CCDC_WBL_O)
		return -1;

	/* writing a 0 clear the overflow */
	mask = ~(mask << wbl_sel);
	val = bl_regr(DM644X_SBL_PCR_VPSS) & mask;
	bl_regw(val, DM644X_SBL_PCR_VPSS);
	return 0;
}

int vpss_clear_wbl_overflow(enum vpss_wbl_sel wbl_sel)
{
	if (!oper_cfg.hw_ops.clear_wbl_overflow)
		return -1;

	return oper_cfg.hw_ops.clear_wbl_overflow(wbl_sel);
}
EXPORT_SYMBOL(vpss_clear_wbl_overflow);

/*
 *  dm355_enable_clock - Enable VPSS Clock
 *  @clock_sel: CLock to be enabled/disabled
 *  @en: enable/disable flag
 *
 *  This is called to enable or disable a vpss clock
 */
static int dm355_enable_clock(enum vpss_clock_sel clock_sel, int en)
{
	unsigned long flags;
	u32 utemp, mask = 0x1, shift = 0;

	switch (clock_sel) {
	case VPSS_VPBE_CLOCK:
		/* nothing since lsb */
		break;
	case VPSS_VENC_CLOCK_SEL:
		shift = 2;
		break;
	case VPSS_CFALD_CLOCK:
		shift = 3;
		break;
	case VPSS_H3A_CLOCK:
		shift = 4;
		break;
	case VPSS_IPIPE_CLOCK:
		shift = 5;
		break;
	case VPSS_CCDC_CLOCK:
		shift = 6;
		break;
	default:
		printk(KERN_ERR "dm355_enable_clock:"
				" Invalid selector: %d\n", clock_sel);
		return -1;
	}

	spin_lock_irqsave(&oper_cfg.vpss_lock, flags);
	utemp = vpss_regr(DM355_VPSSCLK_CLKCTRL);
	if (!en)
		utemp &= ~(mask << shift);
	else
		utemp |= (mask << shift);

	vpss_regw(utemp, DM355_VPSSCLK_CLKCTRL);
	spin_unlock_irqrestore(&oper_cfg.vpss_lock, flags);
	return 0;
}

int vpss_enable_clock(enum vpss_clock_sel clock_sel, int en)
{
	if (!oper_cfg.hw_ops.enable_clock)
		return -1;

	return oper_cfg.hw_ops.enable_clock(clock_sel, en);
}
EXPORT_SYMBOL(vpss_enable_clock);

static int __init vpss_probe(struct platform_device *pdev)
{
	int status, dm355 = 0;

	if (!pdev->dev.platform_data) {
		dev_err(&pdev->dev, "no platform data\n");
		return -ENOENT;
	}
	strcpy(oper_cfg.vpss_name, pdev->dev.platform_data);

	if (!strcmp(oper_cfg.vpss_name, "dm355_vpss"))
		dm355 = 1;
	else if (strcmp(oper_cfg.vpss_name, "dm644x_vpss")) {
		dev_err(&pdev->dev, "vpss driver not supported on"
			" this platform\n");
		return -ENODEV;
	}

	dev_info(&pdev->dev, "%s vpss probed\n", oper_cfg.vpss_name);
	oper_cfg.r1 = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	if (!oper_cfg.r1)
		return -ENOENT;

	oper_cfg.len1 = oper_cfg.r1->end - oper_cfg.r1->start + 1;

	oper_cfg.r1 = request_mem_region(oper_cfg.r1->start, oper_cfg.len1,
					 oper_cfg.r1->name);
	if (!oper_cfg.r1)
		return -EBUSY;

	oper_cfg.vpss_bl_regs_base = ioremap(oper_cfg.r1->start, oper_cfg.len1);
	if (!oper_cfg.vpss_bl_regs_base) {
		status = -EBUSY;
		goto fail1;
	}

	if (dm355) {
		oper_cfg.r2 = platform_get_resource(pdev, IORESOURCE_MEM, 1);
		if (!oper_cfg.r2) {
			status = -ENOENT;
			goto fail2;
		}
		oper_cfg.len2 = oper_cfg.r2->end - oper_cfg.r2->start + 1;
		oper_cfg.r2 = request_mem_region(oper_cfg.r2->start,
						 oper_cfg.len2,
						 oper_cfg.r2->name);
		if (!oper_cfg.r2) {
			status = -EBUSY;
			goto fail2;
		}

		oper_cfg.vpss_regs_base = ioremap(oper_cfg.r2->start,
						  oper_cfg.len2);
		if (!oper_cfg.vpss_regs_base) {
			status = -EBUSY;
			goto fail3;
		}
	}

	if (dm355) {
		oper_cfg.hw_ops.enable_clock = dm355_enable_clock;
		oper_cfg.hw_ops.select_ccdc_source = dm355_select_ccdc_source;
	} else
		oper_cfg.hw_ops.clear_wbl_overflow = dm644x_clear_wbl_overflow;

	spin_lock_init(&oper_cfg.vpss_lock);
	dev_info(&pdev->dev, "%s vpss probe success\n", oper_cfg.vpss_name);
	return 0;

fail3:
	release_mem_region(oper_cfg.r2->start, oper_cfg.len2);
fail2:
	iounmap(oper_cfg.vpss_bl_regs_base);
fail1:
	release_mem_region(oper_cfg.r1->start, oper_cfg.len1);
	return status;
}

static int __devexit vpss_remove(struct platform_device *pdev)
{
	iounmap(oper_cfg.vpss_bl_regs_base);
	release_mem_region(oper_cfg.r1->start, oper_cfg.len1);
	if (!strcmp(oper_cfg.vpss_name, "dm355_vpss")) {
		iounmap(oper_cfg.vpss_regs_base);
		release_mem_region(oper_cfg.r2->start, oper_cfg.len2);
	}
	return 0;
}

static struct platform_driver vpss_driver = {
	.driver = {
		.name	= "vpss",
		.owner = THIS_MODULE,
	},
	.remove = __devexit_p(vpss_remove),
	.probe = vpss_probe,
};

static void vpss_exit(void)
{
	platform_driver_unregister(&vpss_driver);
}

static int __init vpss_init(void)
{
	return platform_driver_register(&vpss_driver);
}
subsys_initcall(vpss_init);
module_exit(vpss_exit);