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11#include <linux/module.h>
12#include <linux/profile.h>
13#include <linux/interrupt.h>
14#include <linux/time.h>
15#include <linux/timex.h>
16#include <linux/irq.h>
17#include <linux/clocksource.h>
18#include <linux/clockchips.h>
19#include <linux/cpufreq.h>
20
21#include <asm/blackfin.h>
22#include <asm/time.h>
23#include <asm/gptimers.h>
24#include <asm/nmi.h>
25
26
27#if defined(CONFIG_CYCLES_CLOCKSOURCE)
28
29static notrace cycle_t bfin_read_cycles(struct clocksource *cs)
30{
31#ifdef CONFIG_CPU_FREQ
32 return __bfin_cycles_off + (get_cycles() << __bfin_cycles_mod);
33#else
34 return get_cycles();
35#endif
36}
37
38static struct clocksource bfin_cs_cycles = {
39 .name = "bfin_cs_cycles",
40 .rating = 400,
41 .read = bfin_read_cycles,
42 .mask = CLOCKSOURCE_MASK(64),
43 .flags = CLOCK_SOURCE_IS_CONTINUOUS,
44};
45
46static inline unsigned long long bfin_cs_cycles_sched_clock(void)
47{
48 return clocksource_cyc2ns(bfin_read_cycles(&bfin_cs_cycles),
49 bfin_cs_cycles.mult, bfin_cs_cycles.shift);
50}
51
52static int __init bfin_cs_cycles_init(void)
53{
54 if (clocksource_register_hz(&bfin_cs_cycles, get_cclk()))
55 panic("failed to register clocksource");
56
57 return 0;
58}
59#else
60# define bfin_cs_cycles_init()
61#endif
62
63#ifdef CONFIG_GPTMR0_CLOCKSOURCE
64
65void __init setup_gptimer0(void)
66{
67 disable_gptimers(TIMER0bit);
68
69 set_gptimer_config(TIMER0_id, \
70 TIMER_OUT_DIS | TIMER_PERIOD_CNT | TIMER_MODE_PWM);
71 set_gptimer_period(TIMER0_id, -1);
72 set_gptimer_pwidth(TIMER0_id, -2);
73 SSYNC();
74 enable_gptimers(TIMER0bit);
75}
76
77static cycle_t bfin_read_gptimer0(struct clocksource *cs)
78{
79 return bfin_read_TIMER0_COUNTER();
80}
81
82static struct clocksource bfin_cs_gptimer0 = {
83 .name = "bfin_cs_gptimer0",
84 .rating = 350,
85 .read = bfin_read_gptimer0,
86 .mask = CLOCKSOURCE_MASK(32),
87 .flags = CLOCK_SOURCE_IS_CONTINUOUS,
88};
89
90static inline unsigned long long bfin_cs_gptimer0_sched_clock(void)
91{
92 return clocksource_cyc2ns(bfin_read_TIMER0_COUNTER(),
93 bfin_cs_gptimer0.mult, bfin_cs_gptimer0.shift);
94}
95
96static int __init bfin_cs_gptimer0_init(void)
97{
98 setup_gptimer0();
99
100 if (clocksource_register_hz(&bfin_cs_gptimer0, get_sclk()))
101 panic("failed to register clocksource");
102
103 return 0;
104}
105#else
106# define bfin_cs_gptimer0_init()
107#endif
108
109#if defined(CONFIG_GPTMR0_CLOCKSOURCE) || defined(CONFIG_CYCLES_CLOCKSOURCE)
110
111notrace unsigned long long sched_clock(void)
112{
113#if defined(CONFIG_CYCLES_CLOCKSOURCE)
114 return bfin_cs_cycles_sched_clock();
115#else
116 return bfin_cs_gptimer0_sched_clock();
117#endif
118}
119#endif
120
121#if defined(CONFIG_TICKSOURCE_GPTMR0)
122static int bfin_gptmr0_set_next_event(unsigned long cycles,
123 struct clock_event_device *evt)
124{
125 disable_gptimers(TIMER0bit);
126
127
128 set_gptimer_pwidth(TIMER0_id, cycles - 3);
129 enable_gptimers(TIMER0bit);
130 return 0;
131}
132
133static void bfin_gptmr0_set_mode(enum clock_event_mode mode,
134 struct clock_event_device *evt)
135{
136 switch (mode) {
137 case CLOCK_EVT_MODE_PERIODIC: {
138 set_gptimer_config(TIMER0_id, \
139 TIMER_OUT_DIS | TIMER_IRQ_ENA | \
140 TIMER_PERIOD_CNT | TIMER_MODE_PWM);
141 set_gptimer_period(TIMER0_id, get_sclk() / HZ);
142 set_gptimer_pwidth(TIMER0_id, get_sclk() / HZ - 1);
143 enable_gptimers(TIMER0bit);
144 break;
145 }
146 case CLOCK_EVT_MODE_ONESHOT:
147 disable_gptimers(TIMER0bit);
148 set_gptimer_config(TIMER0_id, \
149 TIMER_OUT_DIS | TIMER_IRQ_ENA | TIMER_MODE_PWM);
150 set_gptimer_period(TIMER0_id, 0);
151 break;
152 case CLOCK_EVT_MODE_UNUSED:
153 case CLOCK_EVT_MODE_SHUTDOWN:
154 disable_gptimers(TIMER0bit);
155 break;
156 case CLOCK_EVT_MODE_RESUME:
157 break;
158 }
159}
160
161static void bfin_gptmr0_ack(void)
162{
163 set_gptimer_status(TIMER_GROUP1, TIMER_STATUS_TIMIL0);
164}
165
166static void __init bfin_gptmr0_init(void)
167{
168 disable_gptimers(TIMER0bit);
169}
170
171#ifdef CONFIG_CORE_TIMER_IRQ_L1
172__attribute__((l1_text))
173#endif
174irqreturn_t bfin_gptmr0_interrupt(int irq, void *dev_id)
175{
176 struct clock_event_device *evt = dev_id;
177 smp_mb();
178
179
180
181
182
183
184 bfin_gptmr0_ack();
185 evt->event_handler(evt);
186 return IRQ_HANDLED;
187}
188
189static struct irqaction gptmr0_irq = {
190 .name = "Blackfin GPTimer0",
191 .flags = IRQF_DISABLED | IRQF_TIMER | \
192 IRQF_IRQPOLL | IRQF_PERCPU,
193 .handler = bfin_gptmr0_interrupt,
194};
195
196static struct clock_event_device clockevent_gptmr0 = {
197 .name = "bfin_gptimer0",
198 .rating = 300,
199 .irq = IRQ_TIMER0,
200 .shift = 32,
201 .features = CLOCK_EVT_FEAT_PERIODIC | CLOCK_EVT_FEAT_ONESHOT,
202 .set_next_event = bfin_gptmr0_set_next_event,
203 .set_mode = bfin_gptmr0_set_mode,
204};
205
206static void __init bfin_gptmr0_clockevent_init(struct clock_event_device *evt)
207{
208 unsigned long clock_tick;
209
210 clock_tick = get_sclk();
211 evt->mult = div_sc(clock_tick, NSEC_PER_SEC, evt->shift);
212 evt->max_delta_ns = clockevent_delta2ns(-1, evt);
213 evt->min_delta_ns = clockevent_delta2ns(100, evt);
214
215 evt->cpumask = cpumask_of(0);
216
217 clockevents_register_device(evt);
218}
219#endif
220
221#if defined(CONFIG_TICKSOURCE_CORETMR)
222
223static DEFINE_PER_CPU(struct clock_event_device, coretmr_events);
224
225static int bfin_coretmr_set_next_event(unsigned long cycles,
226 struct clock_event_device *evt)
227{
228 bfin_write_TCNTL(TMPWR);
229 CSYNC();
230 bfin_write_TCOUNT(cycles);
231 CSYNC();
232 bfin_write_TCNTL(TMPWR | TMREN);
233 return 0;
234}
235
236static void bfin_coretmr_set_mode(enum clock_event_mode mode,
237 struct clock_event_device *evt)
238{
239 switch (mode) {
240 case CLOCK_EVT_MODE_PERIODIC: {
241 unsigned long tcount = ((get_cclk() / (HZ * TIME_SCALE)) - 1);
242 bfin_write_TCNTL(TMPWR);
243 CSYNC();
244 bfin_write_TSCALE(TIME_SCALE - 1);
245 bfin_write_TPERIOD(tcount);
246 bfin_write_TCOUNT(tcount);
247 CSYNC();
248 bfin_write_TCNTL(TMPWR | TMREN | TAUTORLD);
249 break;
250 }
251 case CLOCK_EVT_MODE_ONESHOT:
252 bfin_write_TCNTL(TMPWR);
253 CSYNC();
254 bfin_write_TSCALE(TIME_SCALE - 1);
255 bfin_write_TPERIOD(0);
256 bfin_write_TCOUNT(0);
257 break;
258 case CLOCK_EVT_MODE_UNUSED:
259 case CLOCK_EVT_MODE_SHUTDOWN:
260 bfin_write_TCNTL(0);
261 CSYNC();
262 break;
263 case CLOCK_EVT_MODE_RESUME:
264 break;
265 }
266}
267
268void bfin_coretmr_init(void)
269{
270
271 bfin_write_TCNTL(TMPWR);
272 CSYNC();
273
274
275 bfin_write_TSCALE(TIME_SCALE - 1);
276 bfin_write_TPERIOD(0);
277 bfin_write_TCOUNT(0);
278
279 CSYNC();
280}
281
282#ifdef CONFIG_CORE_TIMER_IRQ_L1
283__attribute__((l1_text))
284#endif
285irqreturn_t bfin_coretmr_interrupt(int irq, void *dev_id)
286{
287 int cpu = smp_processor_id();
288 struct clock_event_device *evt = &per_cpu(coretmr_events, cpu);
289
290 smp_mb();
291 evt->event_handler(evt);
292
293 touch_nmi_watchdog();
294
295 return IRQ_HANDLED;
296}
297
298static struct irqaction coretmr_irq = {
299 .name = "Blackfin CoreTimer",
300 .flags = IRQF_DISABLED | IRQF_TIMER | \
301 IRQF_IRQPOLL | IRQF_PERCPU,
302 .handler = bfin_coretmr_interrupt,
303};
304
305void bfin_coretmr_clockevent_init(void)
306{
307 unsigned long clock_tick;
308 unsigned int cpu = smp_processor_id();
309 struct clock_event_device *evt = &per_cpu(coretmr_events, cpu);
310
311 evt->name = "bfin_core_timer";
312 evt->rating = 350;
313 evt->irq = -1;
314 evt->shift = 32;
315 evt->features = CLOCK_EVT_FEAT_PERIODIC | CLOCK_EVT_FEAT_ONESHOT;
316 evt->set_next_event = bfin_coretmr_set_next_event;
317 evt->set_mode = bfin_coretmr_set_mode;
318
319 clock_tick = get_cclk() / TIME_SCALE;
320 evt->mult = div_sc(clock_tick, NSEC_PER_SEC, evt->shift);
321 evt->max_delta_ns = clockevent_delta2ns(-1, evt);
322 evt->min_delta_ns = clockevent_delta2ns(100, evt);
323
324 evt->cpumask = cpumask_of(cpu);
325
326 clockevents_register_device(evt);
327}
328#endif
329
330
331void read_persistent_clock(struct timespec *ts)
332{
333 time_t secs_since_1970 = (365 * 37 + 9) * 24 * 60 * 60;
334 ts->tv_sec = secs_since_1970;
335 ts->tv_nsec = 0;
336}
337
338void __init time_init(void)
339{
340
341#ifdef CONFIG_RTC_DRV_BFIN
342
343
344
345
346 if ((bfin_read_RTC_STAT() & 0xC0000000) == 0xC0000000) {
347 printk(KERN_NOTICE "bfin-rtc: invalid date; resetting\n");
348 bfin_write_RTC_STAT(0);
349 }
350#endif
351
352 bfin_cs_cycles_init();
353 bfin_cs_gptimer0_init();
354
355#if defined(CONFIG_TICKSOURCE_CORETMR)
356 bfin_coretmr_init();
357 setup_irq(IRQ_CORETMR, &coretmr_irq);
358 bfin_coretmr_clockevent_init();
359#endif
360
361#if defined(CONFIG_TICKSOURCE_GPTMR0)
362 bfin_gptmr0_init();
363 setup_irq(IRQ_TIMER0, &gptmr0_irq);
364 gptmr0_irq.dev_id = &clockevent_gptmr0;
365 bfin_gptmr0_clockevent_init(&clockevent_gptmr0);
366#endif
367
368#if !defined(CONFIG_TICKSOURCE_CORETMR) && !defined(CONFIG_TICKSOURCE_GPTMR0)
369# error at least one clock event device is required
370#endif
371}
372
