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1 /*
2  * gptimers.c - Blackfin General Purpose Timer core API
3  *
4  * Copyright (c) 2005-2008 Analog Devices Inc.
5  * Copyright (C) 2005 John DeHority
6  * Copyright (C) 2006 Hella Aglaia GmbH (awe@aglaia-gmbh.de)
7  *
8  * Licensed under the GPLv2.
9  */
10 
11 #include <linux/kernel.h>
12 #include <linux/module.h>
13 #include <linux/io.h>
14 
15 #include <asm/blackfin.h>
16 #include <asm/gptimers.h>
17 
18 #ifdef DEBUG
19 # define tassert(expr)
20 #else
21 # define tassert(expr) \
22 	if (!(expr)) \
23 		printk(KERN_DEBUG "%s:%s:%i: Assertion failed: " #expr "\n", __FILE__, __func__, __LINE__);
24 #endif
25 
26 #ifndef CONFIG_BF60x
27 # define BFIN_TIMER_NUM_GROUP  (BFIN_TIMER_OCTET(MAX_BLACKFIN_GPTIMERS - 1) + 1)
28 #else
29 # define BFIN_TIMER_NUM_GROUP  1
30 #endif
31 
32 static struct bfin_gptimer_regs * const timer_regs[MAX_BLACKFIN_GPTIMERS] =
33 {
34 	(void *)TIMER0_CONFIG,
35 	(void *)TIMER1_CONFIG,
36 	(void *)TIMER2_CONFIG,
37 #if (MAX_BLACKFIN_GPTIMERS > 3)
38 	(void *)TIMER3_CONFIG,
39 	(void *)TIMER4_CONFIG,
40 	(void *)TIMER5_CONFIG,
41 	(void *)TIMER6_CONFIG,
42 	(void *)TIMER7_CONFIG,
43 # if (MAX_BLACKFIN_GPTIMERS > 8)
44 	(void *)TIMER8_CONFIG,
45 	(void *)TIMER9_CONFIG,
46 	(void *)TIMER10_CONFIG,
47 #  if (MAX_BLACKFIN_GPTIMERS > 11)
48 	(void *)TIMER11_CONFIG,
49 #  endif
50 # endif
51 #endif
52 };
53 
54 static struct bfin_gptimer_group_regs * const group_regs[BFIN_TIMER_NUM_GROUP] =
55 {
56 	(void *)TIMER0_GROUP_REG,
57 #if (MAX_BLACKFIN_GPTIMERS > 8)
58 	(void *)TIMER8_GROUP_REG,
59 #endif
60 };
61 
62 static uint32_t const trun_mask[MAX_BLACKFIN_GPTIMERS] =
63 {
64 	TIMER_STATUS_TRUN0,
65 	TIMER_STATUS_TRUN1,
66 	TIMER_STATUS_TRUN2,
67 #if (MAX_BLACKFIN_GPTIMERS > 3)
68 	TIMER_STATUS_TRUN3,
69 	TIMER_STATUS_TRUN4,
70 	TIMER_STATUS_TRUN5,
71 	TIMER_STATUS_TRUN6,
72 	TIMER_STATUS_TRUN7,
73 # if (MAX_BLACKFIN_GPTIMERS > 8)
74 	TIMER_STATUS_TRUN8,
75 	TIMER_STATUS_TRUN9,
76 	TIMER_STATUS_TRUN10,
77 #  if (MAX_BLACKFIN_GPTIMERS > 11)
78 	TIMER_STATUS_TRUN11,
79 #  endif
80 # endif
81 #endif
82 };
83 
84 static uint32_t const tovf_mask[MAX_BLACKFIN_GPTIMERS] =
85 {
86 	TIMER_STATUS_TOVF0,
87 	TIMER_STATUS_TOVF1,
88 	TIMER_STATUS_TOVF2,
89 #if (MAX_BLACKFIN_GPTIMERS > 3)
90 	TIMER_STATUS_TOVF3,
91 	TIMER_STATUS_TOVF4,
92 	TIMER_STATUS_TOVF5,
93 	TIMER_STATUS_TOVF6,
94 	TIMER_STATUS_TOVF7,
95 # if (MAX_BLACKFIN_GPTIMERS > 8)
96 	TIMER_STATUS_TOVF8,
97 	TIMER_STATUS_TOVF9,
98 	TIMER_STATUS_TOVF10,
99 #  if (MAX_BLACKFIN_GPTIMERS > 11)
100 	TIMER_STATUS_TOVF11,
101 #  endif
102 # endif
103 #endif
104 };
105 
106 static uint32_t const timil_mask[MAX_BLACKFIN_GPTIMERS] =
107 {
108 	TIMER_STATUS_TIMIL0,
109 	TIMER_STATUS_TIMIL1,
110 	TIMER_STATUS_TIMIL2,
111 #if (MAX_BLACKFIN_GPTIMERS > 3)
112 	TIMER_STATUS_TIMIL3,
113 	TIMER_STATUS_TIMIL4,
114 	TIMER_STATUS_TIMIL5,
115 	TIMER_STATUS_TIMIL6,
116 	TIMER_STATUS_TIMIL7,
117 # if (MAX_BLACKFIN_GPTIMERS > 8)
118 	TIMER_STATUS_TIMIL8,
119 	TIMER_STATUS_TIMIL9,
120 	TIMER_STATUS_TIMIL10,
121 #  if (MAX_BLACKFIN_GPTIMERS > 11)
122 	TIMER_STATUS_TIMIL11,
123 #  endif
124 # endif
125 #endif
126 };
127 
set_gptimer_pwidth(unsigned int timer_id,uint32_t value)128 void set_gptimer_pwidth(unsigned int timer_id, uint32_t value)
129 {
130 	tassert(timer_id < MAX_BLACKFIN_GPTIMERS);
131 	bfin_write(&timer_regs[timer_id]->width, value);
132 	SSYNC();
133 }
134 EXPORT_SYMBOL(set_gptimer_pwidth);
135 
get_gptimer_pwidth(unsigned int timer_id)136 uint32_t get_gptimer_pwidth(unsigned int timer_id)
137 {
138 	tassert(timer_id < MAX_BLACKFIN_GPTIMERS);
139 	return bfin_read(&timer_regs[timer_id]->width);
140 }
141 EXPORT_SYMBOL(get_gptimer_pwidth);
142 
set_gptimer_period(unsigned int timer_id,uint32_t period)143 void set_gptimer_period(unsigned int timer_id, uint32_t period)
144 {
145 	tassert(timer_id < MAX_BLACKFIN_GPTIMERS);
146 	bfin_write(&timer_regs[timer_id]->period, period);
147 	SSYNC();
148 }
149 EXPORT_SYMBOL(set_gptimer_period);
150 
get_gptimer_period(unsigned int timer_id)151 uint32_t get_gptimer_period(unsigned int timer_id)
152 {
153 	tassert(timer_id < MAX_BLACKFIN_GPTIMERS);
154 	return bfin_read(&timer_regs[timer_id]->period);
155 }
156 EXPORT_SYMBOL(get_gptimer_period);
157 
get_gptimer_count(unsigned int timer_id)158 uint32_t get_gptimer_count(unsigned int timer_id)
159 {
160 	tassert(timer_id < MAX_BLACKFIN_GPTIMERS);
161 	return bfin_read(&timer_regs[timer_id]->counter);
162 }
163 EXPORT_SYMBOL(get_gptimer_count);
164 
165 #ifdef CONFIG_BF60x
set_gptimer_delay(unsigned int timer_id,uint32_t delay)166 void set_gptimer_delay(unsigned int timer_id, uint32_t delay)
167 {
168 	tassert(timer_id < MAX_BLACKFIN_GPTIMERS);
169 	bfin_write(&timer_regs[timer_id]->delay, delay);
170 	SSYNC();
171 }
172 EXPORT_SYMBOL(set_gptimer_delay);
173 
get_gptimer_delay(unsigned int timer_id)174 uint32_t get_gptimer_delay(unsigned int timer_id)
175 {
176 	tassert(timer_id < MAX_BLACKFIN_GPTIMERS);
177 	return bfin_read(&timer_regs[timer_id]->delay);
178 }
179 EXPORT_SYMBOL(get_gptimer_delay);
180 #endif
181 
182 #ifdef CONFIG_BF60x
get_gptimer_intr(unsigned int timer_id)183 int get_gptimer_intr(unsigned int timer_id)
184 {
185 	tassert(timer_id < MAX_BLACKFIN_GPTIMERS);
186 	return !!(bfin_read(&group_regs[BFIN_TIMER_OCTET(timer_id)]->data_ilat) & timil_mask[timer_id]);
187 }
188 EXPORT_SYMBOL(get_gptimer_intr);
189 
clear_gptimer_intr(unsigned int timer_id)190 void clear_gptimer_intr(unsigned int timer_id)
191 {
192 	tassert(timer_id < MAX_BLACKFIN_GPTIMERS);
193 	bfin_write(&group_regs[BFIN_TIMER_OCTET(timer_id)]->data_ilat, timil_mask[timer_id]);
194 }
195 EXPORT_SYMBOL(clear_gptimer_intr);
196 
get_gptimer_over(unsigned int timer_id)197 int get_gptimer_over(unsigned int timer_id)
198 {
199 	tassert(timer_id < MAX_BLACKFIN_GPTIMERS);
200 	return !!(bfin_read(&group_regs[BFIN_TIMER_OCTET(timer_id)]->stat_ilat) & tovf_mask[timer_id]);
201 }
202 EXPORT_SYMBOL(get_gptimer_over);
203 
clear_gptimer_over(unsigned int timer_id)204 void clear_gptimer_over(unsigned int timer_id)
205 {
206 	tassert(timer_id < MAX_BLACKFIN_GPTIMERS);
207 	bfin_write(&group_regs[BFIN_TIMER_OCTET(timer_id)]->stat_ilat, tovf_mask[timer_id]);
208 }
209 EXPORT_SYMBOL(clear_gptimer_over);
210 
get_gptimer_run(unsigned int timer_id)211 int get_gptimer_run(unsigned int timer_id)
212 {
213 	tassert(timer_id < MAX_BLACKFIN_GPTIMERS);
214 	return !!(bfin_read(&group_regs[BFIN_TIMER_OCTET(timer_id)]->run) & trun_mask[timer_id]);
215 }
216 EXPORT_SYMBOL(get_gptimer_run);
217 
get_gptimer_status(unsigned int group)218 uint32_t get_gptimer_status(unsigned int group)
219 {
220 	tassert(group < BFIN_TIMER_NUM_GROUP);
221 	return bfin_read(&group_regs[group]->data_ilat);
222 }
223 EXPORT_SYMBOL(get_gptimer_status);
224 
set_gptimer_status(unsigned int group,uint32_t value)225 void set_gptimer_status(unsigned int group, uint32_t value)
226 {
227 	tassert(group < BFIN_TIMER_NUM_GROUP);
228 	bfin_write(&group_regs[group]->data_ilat, value);
229 	SSYNC();
230 }
231 EXPORT_SYMBOL(set_gptimer_status);
232 #else
get_gptimer_status(unsigned int group)233 uint32_t get_gptimer_status(unsigned int group)
234 {
235 	tassert(group < BFIN_TIMER_NUM_GROUP);
236 	return bfin_read(&group_regs[group]->status);
237 }
238 EXPORT_SYMBOL(get_gptimer_status);
239 
set_gptimer_status(unsigned int group,uint32_t value)240 void set_gptimer_status(unsigned int group, uint32_t value)
241 {
242 	tassert(group < BFIN_TIMER_NUM_GROUP);
243 	bfin_write(&group_regs[group]->status, value);
244 	SSYNC();
245 }
246 EXPORT_SYMBOL(set_gptimer_status);
247 
read_gptimer_status(unsigned int timer_id)248 static uint32_t read_gptimer_status(unsigned int timer_id)
249 {
250 	return bfin_read(&group_regs[BFIN_TIMER_OCTET(timer_id)]->status);
251 }
252 
get_gptimer_intr(unsigned int timer_id)253 int get_gptimer_intr(unsigned int timer_id)
254 {
255 	tassert(timer_id < MAX_BLACKFIN_GPTIMERS);
256 	return !!(read_gptimer_status(timer_id) & timil_mask[timer_id]);
257 }
258 EXPORT_SYMBOL(get_gptimer_intr);
259 
clear_gptimer_intr(unsigned int timer_id)260 void clear_gptimer_intr(unsigned int timer_id)
261 {
262 	tassert(timer_id < MAX_BLACKFIN_GPTIMERS);
263 	bfin_write(&group_regs[BFIN_TIMER_OCTET(timer_id)]->status, timil_mask[timer_id]);
264 }
265 EXPORT_SYMBOL(clear_gptimer_intr);
266 
get_gptimer_over(unsigned int timer_id)267 int get_gptimer_over(unsigned int timer_id)
268 {
269 	tassert(timer_id < MAX_BLACKFIN_GPTIMERS);
270 	return !!(read_gptimer_status(timer_id) & tovf_mask[timer_id]);
271 }
272 EXPORT_SYMBOL(get_gptimer_over);
273 
clear_gptimer_over(unsigned int timer_id)274 void clear_gptimer_over(unsigned int timer_id)
275 {
276 	tassert(timer_id < MAX_BLACKFIN_GPTIMERS);
277 	bfin_write(&group_regs[BFIN_TIMER_OCTET(timer_id)]->status, tovf_mask[timer_id]);
278 }
279 EXPORT_SYMBOL(clear_gptimer_over);
280 
get_gptimer_run(unsigned int timer_id)281 int get_gptimer_run(unsigned int timer_id)
282 {
283 	tassert(timer_id < MAX_BLACKFIN_GPTIMERS);
284 	return !!(read_gptimer_status(timer_id) & trun_mask[timer_id]);
285 }
286 EXPORT_SYMBOL(get_gptimer_run);
287 #endif
288 
set_gptimer_config(unsigned int timer_id,uint16_t config)289 void set_gptimer_config(unsigned int timer_id, uint16_t config)
290 {
291 	tassert(timer_id < MAX_BLACKFIN_GPTIMERS);
292 	bfin_write(&timer_regs[timer_id]->config, config);
293 	SSYNC();
294 }
295 EXPORT_SYMBOL(set_gptimer_config);
296 
get_gptimer_config(unsigned int timer_id)297 uint16_t get_gptimer_config(unsigned int timer_id)
298 {
299 	tassert(timer_id < MAX_BLACKFIN_GPTIMERS);
300 	return bfin_read(&timer_regs[timer_id]->config);
301 }
302 EXPORT_SYMBOL(get_gptimer_config);
303 
enable_gptimers(uint16_t mask)304 void enable_gptimers(uint16_t mask)
305 {
306 	int i;
307 #ifdef CONFIG_BF60x
308 	uint16_t imask;
309 	imask = bfin_read16(TIMER_DATA_IMSK);
310 	imask &= ~mask;
311 	bfin_write16(TIMER_DATA_IMSK, imask);
312 #endif
313 	tassert((mask & ~BLACKFIN_GPTIMER_IDMASK) == 0);
314 	for (i = 0; i < BFIN_TIMER_NUM_GROUP; ++i) {
315 		bfin_write(&group_regs[i]->enable, mask & 0xFF);
316 		mask >>= 8;
317 	}
318 	SSYNC();
319 }
320 EXPORT_SYMBOL(enable_gptimers);
321 
_disable_gptimers(uint16_t mask)322 static void _disable_gptimers(uint16_t mask)
323 {
324 	int i;
325 	uint16_t m = mask;
326 	tassert((mask & ~BLACKFIN_GPTIMER_IDMASK) == 0);
327 	for (i = 0; i < BFIN_TIMER_NUM_GROUP; ++i) {
328 		bfin_write(&group_regs[i]->disable, m & 0xFF);
329 		m >>= 8;
330 	}
331 }
332 
disable_gptimers(uint16_t mask)333 void disable_gptimers(uint16_t mask)
334 {
335 #ifndef CONFIG_BF60x
336 	int i;
337 	_disable_gptimers(mask);
338 	for (i = 0; i < MAX_BLACKFIN_GPTIMERS; ++i)
339 		if (mask & (1 << i))
340 			bfin_write(&group_regs[BFIN_TIMER_OCTET(i)]->status, trun_mask[i]);
341 	SSYNC();
342 #else
343 	_disable_gptimers(mask);
344 #endif
345 }
346 EXPORT_SYMBOL(disable_gptimers);
347 
disable_gptimers_sync(uint16_t mask)348 void disable_gptimers_sync(uint16_t mask)
349 {
350 	_disable_gptimers(mask);
351 	SSYNC();
352 }
353 EXPORT_SYMBOL(disable_gptimers_sync);
354 
set_gptimer_pulse_hi(unsigned int timer_id)355 void set_gptimer_pulse_hi(unsigned int timer_id)
356 {
357 	tassert(timer_id < MAX_BLACKFIN_GPTIMERS);
358 	bfin_write_or(&timer_regs[timer_id]->config, TIMER_PULSE_HI);
359 	SSYNC();
360 }
361 EXPORT_SYMBOL(set_gptimer_pulse_hi);
362 
clear_gptimer_pulse_hi(unsigned int timer_id)363 void clear_gptimer_pulse_hi(unsigned int timer_id)
364 {
365 	tassert(timer_id < MAX_BLACKFIN_GPTIMERS);
366 	bfin_write_and(&timer_regs[timer_id]->config, ~TIMER_PULSE_HI);
367 	SSYNC();
368 }
369 EXPORT_SYMBOL(clear_gptimer_pulse_hi);
370 
get_enabled_gptimers(void)371 uint16_t get_enabled_gptimers(void)
372 {
373 	int i;
374 	uint16_t result = 0;
375 	for (i = 0; i < BFIN_TIMER_NUM_GROUP; ++i)
376 		result |= (bfin_read(&group_regs[i]->enable) << (i << 3));
377 	return result;
378 }
379 EXPORT_SYMBOL(get_enabled_gptimers);
380 
381 MODULE_AUTHOR("Axel Weiss (awe@aglaia-gmbh.de)");
382 MODULE_DESCRIPTION("Blackfin General Purpose Timers API");
383 MODULE_LICENSE("GPL");
384