Loading...
1/*
2 * SuperH Timer Support - TMU
3 *
4 * Copyright (C) 2009 Magnus Damm
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License
9 *
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 * GNU General Public License for more details.
14 *
15 * You should have received a copy of the GNU General Public License
16 * along with this program; if not, write to the Free Software
17 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
18 */
19
20#include <linux/init.h>
21#include <linux/platform_device.h>
22#include <linux/spinlock.h>
23#include <linux/interrupt.h>
24#include <linux/ioport.h>
25#include <linux/delay.h>
26#include <linux/io.h>
27#include <linux/clk.h>
28#include <linux/irq.h>
29#include <linux/err.h>
30#include <linux/clocksource.h>
31#include <linux/clockchips.h>
32#include <linux/sh_timer.h>
33#include <linux/slab.h>
34
35struct sh_tmu_priv {
36 void __iomem *mapbase;
37 struct clk *clk;
38 struct irqaction irqaction;
39 struct platform_device *pdev;
40 unsigned long rate;
41 unsigned long periodic;
42 struct clock_event_device ced;
43 struct clocksource cs;
44};
45
46static DEFINE_SPINLOCK(sh_tmu_lock);
47
48#define TSTR -1 /* shared register */
49#define TCOR 0 /* channel register */
50#define TCNT 1 /* channel register */
51#define TCR 2 /* channel register */
52
53static inline unsigned long sh_tmu_read(struct sh_tmu_priv *p, int reg_nr)
54{
55 struct sh_timer_config *cfg = p->pdev->dev.platform_data;
56 void __iomem *base = p->mapbase;
57 unsigned long offs;
58
59 if (reg_nr == TSTR)
60 return ioread8(base - cfg->channel_offset);
61
62 offs = reg_nr << 2;
63
64 if (reg_nr == TCR)
65 return ioread16(base + offs);
66 else
67 return ioread32(base + offs);
68}
69
70static inline void sh_tmu_write(struct sh_tmu_priv *p, int reg_nr,
71 unsigned long value)
72{
73 struct sh_timer_config *cfg = p->pdev->dev.platform_data;
74 void __iomem *base = p->mapbase;
75 unsigned long offs;
76
77 if (reg_nr == TSTR) {
78 iowrite8(value, base - cfg->channel_offset);
79 return;
80 }
81
82 offs = reg_nr << 2;
83
84 if (reg_nr == TCR)
85 iowrite16(value, base + offs);
86 else
87 iowrite32(value, base + offs);
88}
89
90static void sh_tmu_start_stop_ch(struct sh_tmu_priv *p, int start)
91{
92 struct sh_timer_config *cfg = p->pdev->dev.platform_data;
93 unsigned long flags, value;
94
95 /* start stop register shared by multiple timer channels */
96 spin_lock_irqsave(&sh_tmu_lock, flags);
97 value = sh_tmu_read(p, TSTR);
98
99 if (start)
100 value |= 1 << cfg->timer_bit;
101 else
102 value &= ~(1 << cfg->timer_bit);
103
104 sh_tmu_write(p, TSTR, value);
105 spin_unlock_irqrestore(&sh_tmu_lock, flags);
106}
107
108static int sh_tmu_enable(struct sh_tmu_priv *p)
109{
110 int ret;
111
112 /* enable clock */
113 ret = clk_enable(p->clk);
114 if (ret) {
115 dev_err(&p->pdev->dev, "cannot enable clock\n");
116 return ret;
117 }
118
119 /* make sure channel is disabled */
120 sh_tmu_start_stop_ch(p, 0);
121
122 /* maximum timeout */
123 sh_tmu_write(p, TCOR, 0xffffffff);
124 sh_tmu_write(p, TCNT, 0xffffffff);
125
126 /* configure channel to parent clock / 4, irq off */
127 p->rate = clk_get_rate(p->clk) / 4;
128 sh_tmu_write(p, TCR, 0x0000);
129
130 /* enable channel */
131 sh_tmu_start_stop_ch(p, 1);
132
133 return 0;
134}
135
136static void sh_tmu_disable(struct sh_tmu_priv *p)
137{
138 /* disable channel */
139 sh_tmu_start_stop_ch(p, 0);
140
141 /* disable interrupts in TMU block */
142 sh_tmu_write(p, TCR, 0x0000);
143
144 /* stop clock */
145 clk_disable(p->clk);
146}
147
148static void sh_tmu_set_next(struct sh_tmu_priv *p, unsigned long delta,
149 int periodic)
150{
151 /* stop timer */
152 sh_tmu_start_stop_ch(p, 0);
153
154 /* acknowledge interrupt */
155 sh_tmu_read(p, TCR);
156
157 /* enable interrupt */
158 sh_tmu_write(p, TCR, 0x0020);
159
160 /* reload delta value in case of periodic timer */
161 if (periodic)
162 sh_tmu_write(p, TCOR, delta);
163 else
164 sh_tmu_write(p, TCOR, 0xffffffff);
165
166 sh_tmu_write(p, TCNT, delta);
167
168 /* start timer */
169 sh_tmu_start_stop_ch(p, 1);
170}
171
172static irqreturn_t sh_tmu_interrupt(int irq, void *dev_id)
173{
174 struct sh_tmu_priv *p = dev_id;
175
176 /* disable or acknowledge interrupt */
177 if (p->ced.mode == CLOCK_EVT_MODE_ONESHOT)
178 sh_tmu_write(p, TCR, 0x0000);
179 else
180 sh_tmu_write(p, TCR, 0x0020);
181
182 /* notify clockevent layer */
183 p->ced.event_handler(&p->ced);
184 return IRQ_HANDLED;
185}
186
187static struct sh_tmu_priv *cs_to_sh_tmu(struct clocksource *cs)
188{
189 return container_of(cs, struct sh_tmu_priv, cs);
190}
191
192static cycle_t sh_tmu_clocksource_read(struct clocksource *cs)
193{
194 struct sh_tmu_priv *p = cs_to_sh_tmu(cs);
195
196 return sh_tmu_read(p, TCNT) ^ 0xffffffff;
197}
198
199static int sh_tmu_clocksource_enable(struct clocksource *cs)
200{
201 struct sh_tmu_priv *p = cs_to_sh_tmu(cs);
202 int ret;
203
204 ret = sh_tmu_enable(p);
205 if (!ret)
206 __clocksource_updatefreq_hz(cs, p->rate);
207 return ret;
208}
209
210static void sh_tmu_clocksource_disable(struct clocksource *cs)
211{
212 sh_tmu_disable(cs_to_sh_tmu(cs));
213}
214
215static int sh_tmu_register_clocksource(struct sh_tmu_priv *p,
216 char *name, unsigned long rating)
217{
218 struct clocksource *cs = &p->cs;
219
220 cs->name = name;
221 cs->rating = rating;
222 cs->read = sh_tmu_clocksource_read;
223 cs->enable = sh_tmu_clocksource_enable;
224 cs->disable = sh_tmu_clocksource_disable;
225 cs->mask = CLOCKSOURCE_MASK(32);
226 cs->flags = CLOCK_SOURCE_IS_CONTINUOUS;
227
228 dev_info(&p->pdev->dev, "used as clock source\n");
229
230 /* Register with dummy 1 Hz value, gets updated in ->enable() */
231 clocksource_register_hz(cs, 1);
232 return 0;
233}
234
235static struct sh_tmu_priv *ced_to_sh_tmu(struct clock_event_device *ced)
236{
237 return container_of(ced, struct sh_tmu_priv, ced);
238}
239
240static void sh_tmu_clock_event_start(struct sh_tmu_priv *p, int periodic)
241{
242 struct clock_event_device *ced = &p->ced;
243
244 sh_tmu_enable(p);
245
246 /* TODO: calculate good shift from rate and counter bit width */
247
248 ced->shift = 32;
249 ced->mult = div_sc(p->rate, NSEC_PER_SEC, ced->shift);
250 ced->max_delta_ns = clockevent_delta2ns(0xffffffff, ced);
251 ced->min_delta_ns = 5000;
252
253 if (periodic) {
254 p->periodic = (p->rate + HZ/2) / HZ;
255 sh_tmu_set_next(p, p->periodic, 1);
256 }
257}
258
259static void sh_tmu_clock_event_mode(enum clock_event_mode mode,
260 struct clock_event_device *ced)
261{
262 struct sh_tmu_priv *p = ced_to_sh_tmu(ced);
263 int disabled = 0;
264
265 /* deal with old setting first */
266 switch (ced->mode) {
267 case CLOCK_EVT_MODE_PERIODIC:
268 case CLOCK_EVT_MODE_ONESHOT:
269 sh_tmu_disable(p);
270 disabled = 1;
271 break;
272 default:
273 break;
274 }
275
276 switch (mode) {
277 case CLOCK_EVT_MODE_PERIODIC:
278 dev_info(&p->pdev->dev, "used for periodic clock events\n");
279 sh_tmu_clock_event_start(p, 1);
280 break;
281 case CLOCK_EVT_MODE_ONESHOT:
282 dev_info(&p->pdev->dev, "used for oneshot clock events\n");
283 sh_tmu_clock_event_start(p, 0);
284 break;
285 case CLOCK_EVT_MODE_UNUSED:
286 if (!disabled)
287 sh_tmu_disable(p);
288 break;
289 case CLOCK_EVT_MODE_SHUTDOWN:
290 default:
291 break;
292 }
293}
294
295static int sh_tmu_clock_event_next(unsigned long delta,
296 struct clock_event_device *ced)
297{
298 struct sh_tmu_priv *p = ced_to_sh_tmu(ced);
299
300 BUG_ON(ced->mode != CLOCK_EVT_MODE_ONESHOT);
301
302 /* program new delta value */
303 sh_tmu_set_next(p, delta, 0);
304 return 0;
305}
306
307static void sh_tmu_register_clockevent(struct sh_tmu_priv *p,
308 char *name, unsigned long rating)
309{
310 struct clock_event_device *ced = &p->ced;
311 int ret;
312
313 memset(ced, 0, sizeof(*ced));
314
315 ced->name = name;
316 ced->features = CLOCK_EVT_FEAT_PERIODIC;
317 ced->features |= CLOCK_EVT_FEAT_ONESHOT;
318 ced->rating = rating;
319 ced->cpumask = cpumask_of(0);
320 ced->set_next_event = sh_tmu_clock_event_next;
321 ced->set_mode = sh_tmu_clock_event_mode;
322
323 dev_info(&p->pdev->dev, "used for clock events\n");
324 clockevents_register_device(ced);
325
326 ret = setup_irq(p->irqaction.irq, &p->irqaction);
327 if (ret) {
328 dev_err(&p->pdev->dev, "failed to request irq %d\n",
329 p->irqaction.irq);
330 return;
331 }
332}
333
334static int sh_tmu_register(struct sh_tmu_priv *p, char *name,
335 unsigned long clockevent_rating,
336 unsigned long clocksource_rating)
337{
338 if (clockevent_rating)
339 sh_tmu_register_clockevent(p, name, clockevent_rating);
340 else if (clocksource_rating)
341 sh_tmu_register_clocksource(p, name, clocksource_rating);
342
343 return 0;
344}
345
346static int sh_tmu_setup(struct sh_tmu_priv *p, struct platform_device *pdev)
347{
348 struct sh_timer_config *cfg = pdev->dev.platform_data;
349 struct resource *res;
350 int irq, ret;
351 ret = -ENXIO;
352
353 memset(p, 0, sizeof(*p));
354 p->pdev = pdev;
355
356 if (!cfg) {
357 dev_err(&p->pdev->dev, "missing platform data\n");
358 goto err0;
359 }
360
361 platform_set_drvdata(pdev, p);
362
363 res = platform_get_resource(p->pdev, IORESOURCE_MEM, 0);
364 if (!res) {
365 dev_err(&p->pdev->dev, "failed to get I/O memory\n");
366 goto err0;
367 }
368
369 irq = platform_get_irq(p->pdev, 0);
370 if (irq < 0) {
371 dev_err(&p->pdev->dev, "failed to get irq\n");
372 goto err0;
373 }
374
375 /* map memory, let mapbase point to our channel */
376 p->mapbase = ioremap_nocache(res->start, resource_size(res));
377 if (p->mapbase == NULL) {
378 dev_err(&p->pdev->dev, "failed to remap I/O memory\n");
379 goto err0;
380 }
381
382 /* setup data for setup_irq() (too early for request_irq()) */
383 p->irqaction.name = dev_name(&p->pdev->dev);
384 p->irqaction.handler = sh_tmu_interrupt;
385 p->irqaction.dev_id = p;
386 p->irqaction.irq = irq;
387 p->irqaction.flags = IRQF_DISABLED | IRQF_TIMER | \
388 IRQF_IRQPOLL | IRQF_NOBALANCING;
389
390 /* get hold of clock */
391 p->clk = clk_get(&p->pdev->dev, "tmu_fck");
392 if (IS_ERR(p->clk)) {
393 dev_err(&p->pdev->dev, "cannot get clock\n");
394 ret = PTR_ERR(p->clk);
395 goto err1;
396 }
397
398 return sh_tmu_register(p, (char *)dev_name(&p->pdev->dev),
399 cfg->clockevent_rating,
400 cfg->clocksource_rating);
401 err1:
402 iounmap(p->mapbase);
403 err0:
404 return ret;
405}
406
407static int __devinit sh_tmu_probe(struct platform_device *pdev)
408{
409 struct sh_tmu_priv *p = platform_get_drvdata(pdev);
410 int ret;
411
412 if (p) {
413 dev_info(&pdev->dev, "kept as earlytimer\n");
414 return 0;
415 }
416
417 p = kmalloc(sizeof(*p), GFP_KERNEL);
418 if (p == NULL) {
419 dev_err(&pdev->dev, "failed to allocate driver data\n");
420 return -ENOMEM;
421 }
422
423 ret = sh_tmu_setup(p, pdev);
424 if (ret) {
425 kfree(p);
426 platform_set_drvdata(pdev, NULL);
427 }
428 return ret;
429}
430
431static int __devexit sh_tmu_remove(struct platform_device *pdev)
432{
433 return -EBUSY; /* cannot unregister clockevent and clocksource */
434}
435
436static struct platform_driver sh_tmu_device_driver = {
437 .probe = sh_tmu_probe,
438 .remove = __devexit_p(sh_tmu_remove),
439 .driver = {
440 .name = "sh_tmu",
441 }
442};
443
444static int __init sh_tmu_init(void)
445{
446 return platform_driver_register(&sh_tmu_device_driver);
447}
448
449static void __exit sh_tmu_exit(void)
450{
451 platform_driver_unregister(&sh_tmu_device_driver);
452}
453
454early_platform_init("earlytimer", &sh_tmu_device_driver);
455module_init(sh_tmu_init);
456module_exit(sh_tmu_exit);
457
458MODULE_AUTHOR("Magnus Damm");
459MODULE_DESCRIPTION("SuperH TMU Timer Driver");
460MODULE_LICENSE("GPL v2");
1/*
2 * SuperH Timer Support - TMU
3 *
4 * Copyright (C) 2009 Magnus Damm
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License
9 *
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 * GNU General Public License for more details.
14 *
15 * You should have received a copy of the GNU General Public License
16 * along with this program; if not, write to the Free Software
17 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
18 */
19
20#include <linux/init.h>
21#include <linux/platform_device.h>
22#include <linux/spinlock.h>
23#include <linux/interrupt.h>
24#include <linux/ioport.h>
25#include <linux/delay.h>
26#include <linux/io.h>
27#include <linux/clk.h>
28#include <linux/irq.h>
29#include <linux/err.h>
30#include <linux/clocksource.h>
31#include <linux/clockchips.h>
32#include <linux/sh_timer.h>
33#include <linux/slab.h>
34#include <linux/module.h>
35#include <linux/pm_domain.h>
36#include <linux/pm_runtime.h>
37
38struct sh_tmu_priv {
39 void __iomem *mapbase;
40 struct clk *clk;
41 struct irqaction irqaction;
42 struct platform_device *pdev;
43 unsigned long rate;
44 unsigned long periodic;
45 struct clock_event_device ced;
46 struct clocksource cs;
47 bool cs_enabled;
48 unsigned int enable_count;
49};
50
51static DEFINE_RAW_SPINLOCK(sh_tmu_lock);
52
53#define TSTR -1 /* shared register */
54#define TCOR 0 /* channel register */
55#define TCNT 1 /* channel register */
56#define TCR 2 /* channel register */
57
58static inline unsigned long sh_tmu_read(struct sh_tmu_priv *p, int reg_nr)
59{
60 struct sh_timer_config *cfg = p->pdev->dev.platform_data;
61 void __iomem *base = p->mapbase;
62 unsigned long offs;
63
64 if (reg_nr == TSTR)
65 return ioread8(base - cfg->channel_offset);
66
67 offs = reg_nr << 2;
68
69 if (reg_nr == TCR)
70 return ioread16(base + offs);
71 else
72 return ioread32(base + offs);
73}
74
75static inline void sh_tmu_write(struct sh_tmu_priv *p, int reg_nr,
76 unsigned long value)
77{
78 struct sh_timer_config *cfg = p->pdev->dev.platform_data;
79 void __iomem *base = p->mapbase;
80 unsigned long offs;
81
82 if (reg_nr == TSTR) {
83 iowrite8(value, base - cfg->channel_offset);
84 return;
85 }
86
87 offs = reg_nr << 2;
88
89 if (reg_nr == TCR)
90 iowrite16(value, base + offs);
91 else
92 iowrite32(value, base + offs);
93}
94
95static void sh_tmu_start_stop_ch(struct sh_tmu_priv *p, int start)
96{
97 struct sh_timer_config *cfg = p->pdev->dev.platform_data;
98 unsigned long flags, value;
99
100 /* start stop register shared by multiple timer channels */
101 raw_spin_lock_irqsave(&sh_tmu_lock, flags);
102 value = sh_tmu_read(p, TSTR);
103
104 if (start)
105 value |= 1 << cfg->timer_bit;
106 else
107 value &= ~(1 << cfg->timer_bit);
108
109 sh_tmu_write(p, TSTR, value);
110 raw_spin_unlock_irqrestore(&sh_tmu_lock, flags);
111}
112
113static int __sh_tmu_enable(struct sh_tmu_priv *p)
114{
115 int ret;
116
117 /* enable clock */
118 ret = clk_enable(p->clk);
119 if (ret) {
120 dev_err(&p->pdev->dev, "cannot enable clock\n");
121 return ret;
122 }
123
124 /* make sure channel is disabled */
125 sh_tmu_start_stop_ch(p, 0);
126
127 /* maximum timeout */
128 sh_tmu_write(p, TCOR, 0xffffffff);
129 sh_tmu_write(p, TCNT, 0xffffffff);
130
131 /* configure channel to parent clock / 4, irq off */
132 p->rate = clk_get_rate(p->clk) / 4;
133 sh_tmu_write(p, TCR, 0x0000);
134
135 /* enable channel */
136 sh_tmu_start_stop_ch(p, 1);
137
138 return 0;
139}
140
141static int sh_tmu_enable(struct sh_tmu_priv *p)
142{
143 if (p->enable_count++ > 0)
144 return 0;
145
146 pm_runtime_get_sync(&p->pdev->dev);
147 dev_pm_syscore_device(&p->pdev->dev, true);
148
149 return __sh_tmu_enable(p);
150}
151
152static void __sh_tmu_disable(struct sh_tmu_priv *p)
153{
154 /* disable channel */
155 sh_tmu_start_stop_ch(p, 0);
156
157 /* disable interrupts in TMU block */
158 sh_tmu_write(p, TCR, 0x0000);
159
160 /* stop clock */
161 clk_disable(p->clk);
162}
163
164static void sh_tmu_disable(struct sh_tmu_priv *p)
165{
166 if (WARN_ON(p->enable_count == 0))
167 return;
168
169 if (--p->enable_count > 0)
170 return;
171
172 __sh_tmu_disable(p);
173
174 dev_pm_syscore_device(&p->pdev->dev, false);
175 pm_runtime_put(&p->pdev->dev);
176}
177
178static void sh_tmu_set_next(struct sh_tmu_priv *p, unsigned long delta,
179 int periodic)
180{
181 /* stop timer */
182 sh_tmu_start_stop_ch(p, 0);
183
184 /* acknowledge interrupt */
185 sh_tmu_read(p, TCR);
186
187 /* enable interrupt */
188 sh_tmu_write(p, TCR, 0x0020);
189
190 /* reload delta value in case of periodic timer */
191 if (periodic)
192 sh_tmu_write(p, TCOR, delta);
193 else
194 sh_tmu_write(p, TCOR, 0xffffffff);
195
196 sh_tmu_write(p, TCNT, delta);
197
198 /* start timer */
199 sh_tmu_start_stop_ch(p, 1);
200}
201
202static irqreturn_t sh_tmu_interrupt(int irq, void *dev_id)
203{
204 struct sh_tmu_priv *p = dev_id;
205
206 /* disable or acknowledge interrupt */
207 if (p->ced.mode == CLOCK_EVT_MODE_ONESHOT)
208 sh_tmu_write(p, TCR, 0x0000);
209 else
210 sh_tmu_write(p, TCR, 0x0020);
211
212 /* notify clockevent layer */
213 p->ced.event_handler(&p->ced);
214 return IRQ_HANDLED;
215}
216
217static struct sh_tmu_priv *cs_to_sh_tmu(struct clocksource *cs)
218{
219 return container_of(cs, struct sh_tmu_priv, cs);
220}
221
222static cycle_t sh_tmu_clocksource_read(struct clocksource *cs)
223{
224 struct sh_tmu_priv *p = cs_to_sh_tmu(cs);
225
226 return sh_tmu_read(p, TCNT) ^ 0xffffffff;
227}
228
229static int sh_tmu_clocksource_enable(struct clocksource *cs)
230{
231 struct sh_tmu_priv *p = cs_to_sh_tmu(cs);
232 int ret;
233
234 if (WARN_ON(p->cs_enabled))
235 return 0;
236
237 ret = sh_tmu_enable(p);
238 if (!ret) {
239 __clocksource_updatefreq_hz(cs, p->rate);
240 p->cs_enabled = true;
241 }
242
243 return ret;
244}
245
246static void sh_tmu_clocksource_disable(struct clocksource *cs)
247{
248 struct sh_tmu_priv *p = cs_to_sh_tmu(cs);
249
250 if (WARN_ON(!p->cs_enabled))
251 return;
252
253 sh_tmu_disable(p);
254 p->cs_enabled = false;
255}
256
257static void sh_tmu_clocksource_suspend(struct clocksource *cs)
258{
259 struct sh_tmu_priv *p = cs_to_sh_tmu(cs);
260
261 if (!p->cs_enabled)
262 return;
263
264 if (--p->enable_count == 0) {
265 __sh_tmu_disable(p);
266 pm_genpd_syscore_poweroff(&p->pdev->dev);
267 }
268}
269
270static void sh_tmu_clocksource_resume(struct clocksource *cs)
271{
272 struct sh_tmu_priv *p = cs_to_sh_tmu(cs);
273
274 if (!p->cs_enabled)
275 return;
276
277 if (p->enable_count++ == 0) {
278 pm_genpd_syscore_poweron(&p->pdev->dev);
279 __sh_tmu_enable(p);
280 }
281}
282
283static int sh_tmu_register_clocksource(struct sh_tmu_priv *p,
284 char *name, unsigned long rating)
285{
286 struct clocksource *cs = &p->cs;
287
288 cs->name = name;
289 cs->rating = rating;
290 cs->read = sh_tmu_clocksource_read;
291 cs->enable = sh_tmu_clocksource_enable;
292 cs->disable = sh_tmu_clocksource_disable;
293 cs->suspend = sh_tmu_clocksource_suspend;
294 cs->resume = sh_tmu_clocksource_resume;
295 cs->mask = CLOCKSOURCE_MASK(32);
296 cs->flags = CLOCK_SOURCE_IS_CONTINUOUS;
297
298 dev_info(&p->pdev->dev, "used as clock source\n");
299
300 /* Register with dummy 1 Hz value, gets updated in ->enable() */
301 clocksource_register_hz(cs, 1);
302 return 0;
303}
304
305static struct sh_tmu_priv *ced_to_sh_tmu(struct clock_event_device *ced)
306{
307 return container_of(ced, struct sh_tmu_priv, ced);
308}
309
310static void sh_tmu_clock_event_start(struct sh_tmu_priv *p, int periodic)
311{
312 struct clock_event_device *ced = &p->ced;
313
314 sh_tmu_enable(p);
315
316 clockevents_config(ced, p->rate);
317
318 if (periodic) {
319 p->periodic = (p->rate + HZ/2) / HZ;
320 sh_tmu_set_next(p, p->periodic, 1);
321 }
322}
323
324static void sh_tmu_clock_event_mode(enum clock_event_mode mode,
325 struct clock_event_device *ced)
326{
327 struct sh_tmu_priv *p = ced_to_sh_tmu(ced);
328 int disabled = 0;
329
330 /* deal with old setting first */
331 switch (ced->mode) {
332 case CLOCK_EVT_MODE_PERIODIC:
333 case CLOCK_EVT_MODE_ONESHOT:
334 sh_tmu_disable(p);
335 disabled = 1;
336 break;
337 default:
338 break;
339 }
340
341 switch (mode) {
342 case CLOCK_EVT_MODE_PERIODIC:
343 dev_info(&p->pdev->dev, "used for periodic clock events\n");
344 sh_tmu_clock_event_start(p, 1);
345 break;
346 case CLOCK_EVT_MODE_ONESHOT:
347 dev_info(&p->pdev->dev, "used for oneshot clock events\n");
348 sh_tmu_clock_event_start(p, 0);
349 break;
350 case CLOCK_EVT_MODE_UNUSED:
351 if (!disabled)
352 sh_tmu_disable(p);
353 break;
354 case CLOCK_EVT_MODE_SHUTDOWN:
355 default:
356 break;
357 }
358}
359
360static int sh_tmu_clock_event_next(unsigned long delta,
361 struct clock_event_device *ced)
362{
363 struct sh_tmu_priv *p = ced_to_sh_tmu(ced);
364
365 BUG_ON(ced->mode != CLOCK_EVT_MODE_ONESHOT);
366
367 /* program new delta value */
368 sh_tmu_set_next(p, delta, 0);
369 return 0;
370}
371
372static void sh_tmu_clock_event_suspend(struct clock_event_device *ced)
373{
374 pm_genpd_syscore_poweroff(&ced_to_sh_tmu(ced)->pdev->dev);
375}
376
377static void sh_tmu_clock_event_resume(struct clock_event_device *ced)
378{
379 pm_genpd_syscore_poweron(&ced_to_sh_tmu(ced)->pdev->dev);
380}
381
382static void sh_tmu_register_clockevent(struct sh_tmu_priv *p,
383 char *name, unsigned long rating)
384{
385 struct clock_event_device *ced = &p->ced;
386 int ret;
387
388 memset(ced, 0, sizeof(*ced));
389
390 ced->name = name;
391 ced->features = CLOCK_EVT_FEAT_PERIODIC;
392 ced->features |= CLOCK_EVT_FEAT_ONESHOT;
393 ced->rating = rating;
394 ced->cpumask = cpumask_of(0);
395 ced->set_next_event = sh_tmu_clock_event_next;
396 ced->set_mode = sh_tmu_clock_event_mode;
397 ced->suspend = sh_tmu_clock_event_suspend;
398 ced->resume = sh_tmu_clock_event_resume;
399
400 dev_info(&p->pdev->dev, "used for clock events\n");
401
402 clockevents_config_and_register(ced, 1, 0x300, 0xffffffff);
403
404 ret = setup_irq(p->irqaction.irq, &p->irqaction);
405 if (ret) {
406 dev_err(&p->pdev->dev, "failed to request irq %d\n",
407 p->irqaction.irq);
408 return;
409 }
410}
411
412static int sh_tmu_register(struct sh_tmu_priv *p, char *name,
413 unsigned long clockevent_rating,
414 unsigned long clocksource_rating)
415{
416 if (clockevent_rating)
417 sh_tmu_register_clockevent(p, name, clockevent_rating);
418 else if (clocksource_rating)
419 sh_tmu_register_clocksource(p, name, clocksource_rating);
420
421 return 0;
422}
423
424static int sh_tmu_setup(struct sh_tmu_priv *p, struct platform_device *pdev)
425{
426 struct sh_timer_config *cfg = pdev->dev.platform_data;
427 struct resource *res;
428 int irq, ret;
429 ret = -ENXIO;
430
431 memset(p, 0, sizeof(*p));
432 p->pdev = pdev;
433
434 if (!cfg) {
435 dev_err(&p->pdev->dev, "missing platform data\n");
436 goto err0;
437 }
438
439 platform_set_drvdata(pdev, p);
440
441 res = platform_get_resource(p->pdev, IORESOURCE_MEM, 0);
442 if (!res) {
443 dev_err(&p->pdev->dev, "failed to get I/O memory\n");
444 goto err0;
445 }
446
447 irq = platform_get_irq(p->pdev, 0);
448 if (irq < 0) {
449 dev_err(&p->pdev->dev, "failed to get irq\n");
450 goto err0;
451 }
452
453 /* map memory, let mapbase point to our channel */
454 p->mapbase = ioremap_nocache(res->start, resource_size(res));
455 if (p->mapbase == NULL) {
456 dev_err(&p->pdev->dev, "failed to remap I/O memory\n");
457 goto err0;
458 }
459
460 /* setup data for setup_irq() (too early for request_irq()) */
461 p->irqaction.name = dev_name(&p->pdev->dev);
462 p->irqaction.handler = sh_tmu_interrupt;
463 p->irqaction.dev_id = p;
464 p->irqaction.irq = irq;
465 p->irqaction.flags = IRQF_TIMER | IRQF_IRQPOLL | IRQF_NOBALANCING;
466
467 /* get hold of clock */
468 p->clk = clk_get(&p->pdev->dev, "tmu_fck");
469 if (IS_ERR(p->clk)) {
470 dev_err(&p->pdev->dev, "cannot get clock\n");
471 ret = PTR_ERR(p->clk);
472 goto err1;
473 }
474
475 ret = clk_prepare(p->clk);
476 if (ret < 0)
477 goto err2;
478
479 p->cs_enabled = false;
480 p->enable_count = 0;
481
482 ret = sh_tmu_register(p, (char *)dev_name(&p->pdev->dev),
483 cfg->clockevent_rating,
484 cfg->clocksource_rating);
485 if (ret < 0)
486 goto err3;
487
488 return 0;
489
490 err3:
491 clk_unprepare(p->clk);
492 err2:
493 clk_put(p->clk);
494 err1:
495 iounmap(p->mapbase);
496 err0:
497 return ret;
498}
499
500static int sh_tmu_probe(struct platform_device *pdev)
501{
502 struct sh_tmu_priv *p = platform_get_drvdata(pdev);
503 struct sh_timer_config *cfg = pdev->dev.platform_data;
504 int ret;
505
506 if (!is_early_platform_device(pdev)) {
507 pm_runtime_set_active(&pdev->dev);
508 pm_runtime_enable(&pdev->dev);
509 }
510
511 if (p) {
512 dev_info(&pdev->dev, "kept as earlytimer\n");
513 goto out;
514 }
515
516 p = kmalloc(sizeof(*p), GFP_KERNEL);
517 if (p == NULL) {
518 dev_err(&pdev->dev, "failed to allocate driver data\n");
519 return -ENOMEM;
520 }
521
522 ret = sh_tmu_setup(p, pdev);
523 if (ret) {
524 kfree(p);
525 pm_runtime_idle(&pdev->dev);
526 return ret;
527 }
528 if (is_early_platform_device(pdev))
529 return 0;
530
531 out:
532 if (cfg->clockevent_rating || cfg->clocksource_rating)
533 pm_runtime_irq_safe(&pdev->dev);
534 else
535 pm_runtime_idle(&pdev->dev);
536
537 return 0;
538}
539
540static int sh_tmu_remove(struct platform_device *pdev)
541{
542 return -EBUSY; /* cannot unregister clockevent and clocksource */
543}
544
545static struct platform_driver sh_tmu_device_driver = {
546 .probe = sh_tmu_probe,
547 .remove = sh_tmu_remove,
548 .driver = {
549 .name = "sh_tmu",
550 }
551};
552
553static int __init sh_tmu_init(void)
554{
555 return platform_driver_register(&sh_tmu_device_driver);
556}
557
558static void __exit sh_tmu_exit(void)
559{
560 platform_driver_unregister(&sh_tmu_device_driver);
561}
562
563early_platform_init("earlytimer", &sh_tmu_device_driver);
564subsys_initcall(sh_tmu_init);
565module_exit(sh_tmu_exit);
566
567MODULE_AUTHOR("Magnus Damm");
568MODULE_DESCRIPTION("SuperH TMU Timer Driver");
569MODULE_LICENSE("GPL v2");