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Linux/arch/blackfin/kernel/gptimers.c

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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 
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 
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 
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 
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 
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
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 
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
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 
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 
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 
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 
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 
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 
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
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 
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 
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 
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 
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 
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 
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 
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 
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 
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 
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 
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 
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 
348 void disable_gptimers_sync(uint16_t mask)
349 {
350         _disable_gptimers(mask);
351         SSYNC();
352 }
353 EXPORT_SYMBOL(disable_gptimers_sync);
354 
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 
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 
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 

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