aboutsummaryrefslogtreecommitdiffstats
path: root/arch/blackfin/kernel/gptimers.c
blob: 06459f4bf43a61371af9a1dcaf159edb35abd4bb (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
/*
 * gptimers.c - Blackfin General Purpose Timer core API
 *
 * Copyright (c) 2005-2008 Analog Devices Inc.
 * Copyright (C) 2005 John DeHority
 * Copyright (C) 2006 Hella Aglaia GmbH (awe@aglaia-gmbh.de)
 *
 * Licensed under the GPLv2.
 */

#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/io.h>

#include <asm/blackfin.h>
#include <asm/gptimers.h>

#ifdef DEBUG
# define tassert(expr)
#else
# define tassert(expr) \
	if (!(expr)) \
		printk(KERN_DEBUG "%s:%s:%i: Assertion failed: " #expr "\n", __FILE__, __func__, __LINE__);
#endif

#define BFIN_TIMER_NUM_GROUP  (BFIN_TIMER_OCTET(MAX_BLACKFIN_GPTIMERS - 1) + 1)

static struct bfin_gptimer_regs * const timer_regs[MAX_BLACKFIN_GPTIMERS] =
{
	(void *)TIMER0_CONFIG,
	(void *)TIMER1_CONFIG,
	(void *)TIMER2_CONFIG,
#if (MAX_BLACKFIN_GPTIMERS > 3)
	(void *)TIMER3_CONFIG,
	(void *)TIMER4_CONFIG,
	(void *)TIMER5_CONFIG,
	(void *)TIMER6_CONFIG,
	(void *)TIMER7_CONFIG,
# if (MAX_BLACKFIN_GPTIMERS > 8)
	(void *)TIMER8_CONFIG,
	(void *)TIMER9_CONFIG,
	(void *)TIMER10_CONFIG,
#  if (MAX_BLACKFIN_GPTIMERS > 11)
	(void *)TIMER11_CONFIG,
#  endif
# endif
#endif
};

static struct bfin_gptimer_group_regs * const group_regs[BFIN_TIMER_NUM_GROUP] =
{
	(void *)TIMER0_GROUP_REG,
#if (MAX_BLACKFIN_GPTIMERS > 8)
	(void *)TIMER8_GROUP_REG,
#endif
};

static uint32_t const trun_mask[MAX_BLACKFIN_GPTIMERS] =
{
	TIMER_STATUS_TRUN0,
	TIMER_STATUS_TRUN1,
	TIMER_STATUS_TRUN2,
#if (MAX_BLACKFIN_GPTIMERS > 3)
	TIMER_STATUS_TRUN3,
	TIMER_STATUS_TRUN4,
	TIMER_STATUS_TRUN5,
	TIMER_STATUS_TRUN6,
	TIMER_STATUS_TRUN7,
# if (MAX_BLACKFIN_GPTIMERS > 8)
	TIMER_STATUS_TRUN8,
	TIMER_STATUS_TRUN9,
	TIMER_STATUS_TRUN10,
#  if (MAX_BLACKFIN_GPTIMERS > 11)
	TIMER_STATUS_TRUN11,
#  endif
# endif
#endif
};

static uint32_t const tovf_mask[MAX_BLACKFIN_GPTIMERS] =
{
	TIMER_STATUS_TOVF0,
	TIMER_STATUS_TOVF1,
	TIMER_STATUS_TOVF2,
#if (MAX_BLACKFIN_GPTIMERS > 3)
	TIMER_STATUS_TOVF3,
	TIMER_STATUS_TOVF4,
	TIMER_STATUS_TOVF5,
	TIMER_STATUS_TOVF6,
	TIMER_STATUS_TOVF7,
# if (MAX_BLACKFIN_GPTIMERS > 8)
	TIMER_STATUS_TOVF8,
	TIMER_STATUS_TOVF9,
	TIMER_STATUS_TOVF10,
#  if (MAX_BLACKFIN_GPTIMERS > 11)
	TIMER_STATUS_TOVF11,
#  endif
# endif
#endif
};

static uint32_t const timil_mask[MAX_BLACKFIN_GPTIMERS] =
{
	TIMER_STATUS_TIMIL0,
	TIMER_STATUS_TIMIL1,
	TIMER_STATUS_TIMIL2,
#if (MAX_BLACKFIN_GPTIMERS > 3)
	TIMER_STATUS_TIMIL3,
	TIMER_STATUS_TIMIL4,
	TIMER_STATUS_TIMIL5,
	TIMER_STATUS_TIMIL6,
	TIMER_STATUS_TIMIL7,
# if (MAX_BLACKFIN_GPTIMERS > 8)
	TIMER_STATUS_TIMIL8,
	TIMER_STATUS_TIMIL9,
	TIMER_STATUS_TIMIL10,
#  if (MAX_BLACKFIN_GPTIMERS > 11)
	TIMER_STATUS_TIMIL11,
#  endif
# endif
#endif
};

void set_gptimer_pwidth(unsigned int timer_id, uint32_t value)
{
	tassert(timer_id < MAX_BLACKFIN_GPTIMERS);
	bfin_write(&timer_regs[timer_id]->width, value);
	SSYNC();
}
EXPORT_SYMBOL(set_gptimer_pwidth);

uint32_t get_gptimer_pwidth(unsigned int timer_id)
{
	tassert(timer_id < MAX_BLACKFIN_GPTIMERS);
	return bfin_read(&timer_regs[timer_id]->width);
}
EXPORT_SYMBOL(get_gptimer_pwidth);

void set_gptimer_period(unsigned int timer_id, uint32_t period)
{
	tassert(timer_id < MAX_BLACKFIN_GPTIMERS);
	bfin_write(&timer_regs[timer_id]->period, period);
	SSYNC();
}
EXPORT_SYMBOL(set_gptimer_period);

uint32_t get_gptimer_period(unsigned int timer_id)
{
	tassert(timer_id < MAX_BLACKFIN_GPTIMERS);
	return bfin_read(&timer_regs[timer_id]->period);
}
EXPORT_SYMBOL(get_gptimer_period);

uint32_t get_gptimer_count(unsigned int timer_id)
{
	tassert(timer_id < MAX_BLACKFIN_GPTIMERS);
	return bfin_read(&timer_regs[timer_id]->counter);
}
EXPORT_SYMBOL(get_gptimer_count);

uint32_t get_gptimer_status(unsigned int group)
{
	tassert(group < BFIN_TIMER_NUM_GROUP);
	return bfin_read(&group_regs[group]->status);
}
EXPORT_SYMBOL(get_gptimer_status);

void set_gptimer_status(unsigned int group, uint32_t value)
{
	tassert(group < BFIN_TIMER_NUM_GROUP);
	bfin_write(&group_regs[group]->status, value);
	SSYNC();
}
EXPORT_SYMBOL(set_gptimer_status);

static uint32_t read_gptimer_status(unsigned int timer_id)
{
	return bfin_read(&group_regs[BFIN_TIMER_OCTET(timer_id)]->status);
}

int get_gptimer_intr(unsigned int timer_id)
{
	tassert(timer_id < MAX_BLACKFIN_GPTIMERS);
	return !!(read_gptimer_status(timer_id) & timil_mask[timer_id]);
}
EXPORT_SYMBOL(get_gptimer_intr);

void clear_gptimer_intr(unsigned int timer_id)
{
	tassert(timer_id < MAX_BLACKFIN_GPTIMERS);
	bfin_write(&group_regs[BFIN_TIMER_OCTET(timer_id)]->status, timil_mask[timer_id]);
}
EXPORT_SYMBOL(clear_gptimer_intr);

int get_gptimer_over(unsigned int timer_id)
{
	tassert(timer_id < MAX_BLACKFIN_GPTIMERS);
	return !!(read_gptimer_status(timer_id) & tovf_mask[timer_id]);
}
EXPORT_SYMBOL(get_gptimer_over);

void clear_gptimer_over(unsigned int timer_id)
{
	tassert(timer_id < MAX_BLACKFIN_GPTIMERS);
	bfin_write(&group_regs[BFIN_TIMER_OCTET(timer_id)]->status, tovf_mask[timer_id]);
}
EXPORT_SYMBOL(clear_gptimer_over);

int get_gptimer_run(unsigned int timer_id)
{
	tassert(timer_id < MAX_BLACKFIN_GPTIMERS);
	return !!(read_gptimer_status(timer_id) & trun_mask[timer_id]);
}
EXPORT_SYMBOL(get_gptimer_run);

void set_gptimer_config(unsigned int timer_id, uint16_t config)
{
	tassert(timer_id < MAX_BLACKFIN_GPTIMERS);
	bfin_write(&timer_regs[timer_id]->config, config);
	SSYNC();
}
EXPORT_SYMBOL(set_gptimer_config);

uint16_t get_gptimer_config(unsigned int timer_id)
{
	tassert(timer_id < MAX_BLACKFIN_GPTIMERS);
	return bfin_read(&timer_regs[timer_id]->config);
}
EXPORT_SYMBOL(get_gptimer_config);

void enable_gptimers(uint16_t mask)
{
	int i;
	tassert((mask & ~BLACKFIN_GPTIMER_IDMASK) == 0);
	for (i = 0; i < BFIN_TIMER_NUM_GROUP; ++i) {
		bfin_write(&group_regs[i]->enable, mask & 0xFF);
		mask >>= 8;
	}
	SSYNC();
}
EXPORT_SYMBOL(enable_gptimers);

static void _disable_gptimers(uint16_t mask)
{
	int i;
	uint16_t m = mask;
	tassert((mask & ~BLACKFIN_GPTIMER_IDMASK) == 0);
	for (i = 0; i < BFIN_TIMER_NUM_GROUP; ++i) {
		bfin_write(&group_regs[i]->disable, m & 0xFF);
		m >>= 8;
	}
}

void disable_gptimers(uint16_t mask)
{
	int i;
	_disable_gptimers(mask);
	for (i = 0; i < MAX_BLACKFIN_GPTIMERS; ++i)
		if (mask & (1 << i))
			bfin_write(&group_regs[BFIN_TIMER_OCTET(i)]->status, trun_mask[i]);
	SSYNC();
}
EXPORT_SYMBOL(disable_gptimers);

void disable_gptimers_sync(uint16_t mask)
{
	_disable_gptimers(mask);
	SSYNC();
}
EXPORT_SYMBOL(disable_gptimers_sync);

void set_gptimer_pulse_hi(unsigned int timer_id)
{
	tassert(timer_id < MAX_BLACKFIN_GPTIMERS);
	bfin_write_or(&timer_regs[timer_id]->config, TIMER_PULSE_HI);
	SSYNC();
}
EXPORT_SYMBOL(set_gptimer_pulse_hi);

void clear_gptimer_pulse_hi(unsigned int timer_id)
{
	tassert(timer_id < MAX_BLACKFIN_GPTIMERS);
	bfin_write_and(&timer_regs[timer_id]->config, ~TIMER_PULSE_HI);
	SSYNC();
}
EXPORT_SYMBOL(clear_gptimer_pulse_hi);

uint16_t get_enabled_gptimers(void)
{
	int i;
	uint16_t result = 0;
	for (i = 0; i < BFIN_TIMER_NUM_GROUP; ++i)
		result |= (bfin_read(&group_regs[i]->enable) << (i << 3));
	return result;
}
EXPORT_SYMBOL(get_enabled_gptimers);

MODULE_AUTHOR("Axel Weiss (awe@aglaia-gmbh.de)");
MODULE_DESCRIPTION("Blackfin General Purpose Timers API");
MODULE_LICENSE("GPL");