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
32static 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
54static 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
62static 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
84static 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
106static 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
128void 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}
134EXPORT_SYMBOL(set_gptimer_pwidth);
135
136uint32_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}
141EXPORT_SYMBOL(get_gptimer_pwidth);
142
143void 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}
149EXPORT_SYMBOL(set_gptimer_period);
150
151uint32_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}
156EXPORT_SYMBOL(get_gptimer_period);
157
158uint32_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}
163EXPORT_SYMBOL(get_gptimer_count);
164
165#ifdef CONFIG_BF60x
166void 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}
172EXPORT_SYMBOL(set_gptimer_delay);
173
174uint32_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}
179EXPORT_SYMBOL(get_gptimer_delay);
180#endif
181
182#ifdef CONFIG_BF60x
183int 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}
188EXPORT_SYMBOL(get_gptimer_intr);
189
190void 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}
195EXPORT_SYMBOL(clear_gptimer_intr);
196
197int 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}
202EXPORT_SYMBOL(get_gptimer_over);
203
204void 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}
209EXPORT_SYMBOL(clear_gptimer_over);
210
211int 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}
216EXPORT_SYMBOL(get_gptimer_run);
217
218uint32_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}
223EXPORT_SYMBOL(get_gptimer_status);
224
225void 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}
231EXPORT_SYMBOL(set_gptimer_status);
232#else
233uint32_t get_gptimer_status(unsigned int group)
234{
235	tassert(group < BFIN_TIMER_NUM_GROUP);
236	return bfin_read(&group_regs[group]->status);
237}
238EXPORT_SYMBOL(get_gptimer_status);
239
240void 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}
246EXPORT_SYMBOL(set_gptimer_status);
247
248static uint32_t read_gptimer_status(unsigned int timer_id)
249{
250	return bfin_read(&group_regs[BFIN_TIMER_OCTET(timer_id)]->status);
251}
252
253int 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}
258EXPORT_SYMBOL(get_gptimer_intr);
259
260void 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}
265EXPORT_SYMBOL(clear_gptimer_intr);
266
267int 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}
272EXPORT_SYMBOL(get_gptimer_over);
273
274void 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}
279EXPORT_SYMBOL(clear_gptimer_over);
280
281int 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}
286EXPORT_SYMBOL(get_gptimer_run);
287#endif
288
289void 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}
295EXPORT_SYMBOL(set_gptimer_config);
296
297uint16_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}
302EXPORT_SYMBOL(get_gptimer_config);
303
304void 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}
320EXPORT_SYMBOL(enable_gptimers);
321
322static 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
333void 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}
346EXPORT_SYMBOL(disable_gptimers);
347
348void disable_gptimers_sync(uint16_t mask)
349{
350	_disable_gptimers(mask);
351	SSYNC();
352}
353EXPORT_SYMBOL(disable_gptimers_sync);
354
355void 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}
361EXPORT_SYMBOL(set_gptimer_pulse_hi);
362
363void 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}
369EXPORT_SYMBOL(clear_gptimer_pulse_hi);
370
371uint16_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}
379EXPORT_SYMBOL(get_enabled_gptimers);
380
381MODULE_AUTHOR("Axel Weiss (awe@aglaia-gmbh.de)");
382MODULE_DESCRIPTION("Blackfin General Purpose Timers API");
383MODULE_LICENSE("GPL");
384