Commit | Line | Data |
---|---|---|
1dbae815 | 1 | /* |
0f622e8c | 2 | * linux/arch/arm/mach-omap2/timer.c |
1dbae815 TL |
3 | * |
4 | * OMAP2 GP timer support. | |
5 | * | |
f248076c PW |
6 | * Copyright (C) 2009 Nokia Corporation |
7 | * | |
5a3a388f KH |
8 | * Update to use new clocksource/clockevent layers |
9 | * Author: Kevin Hilman, MontaVista Software, Inc. <source@mvista.com> | |
10 | * Copyright (C) 2007 MontaVista Software, Inc. | |
11 | * | |
12 | * Original driver: | |
1dbae815 TL |
13 | * Copyright (C) 2005 Nokia Corporation |
14 | * Author: Paul Mundt <paul.mundt@nokia.com> | |
96de0e25 | 15 | * Juha Yrjölä <juha.yrjola@nokia.com> |
77900a2f | 16 | * OMAP Dual-mode timer framework support by Timo Teras |
1dbae815 TL |
17 | * |
18 | * Some parts based off of TI's 24xx code: | |
19 | * | |
44169075 | 20 | * Copyright (C) 2004-2009 Texas Instruments, Inc. |
1dbae815 TL |
21 | * |
22 | * Roughly modelled after the OMAP1 MPU timer code. | |
44169075 | 23 | * Added OMAP4 support - Santosh Shilimkar <santosh.shilimkar@ti.com> |
1dbae815 TL |
24 | * |
25 | * This file is subject to the terms and conditions of the GNU General Public | |
26 | * License. See the file "COPYING" in the main directory of this archive | |
27 | * for more details. | |
28 | */ | |
29 | #include <linux/init.h> | |
30 | #include <linux/time.h> | |
31 | #include <linux/interrupt.h> | |
32 | #include <linux/err.h> | |
f8ce2547 | 33 | #include <linux/clk.h> |
77900a2f | 34 | #include <linux/delay.h> |
e6687290 | 35 | #include <linux/irq.h> |
5a3a388f KH |
36 | #include <linux/clocksource.h> |
37 | #include <linux/clockchips.h> | |
c345c8b0 | 38 | #include <linux/slab.h> |
f8ce2547 | 39 | |
1dbae815 | 40 | #include <asm/mach/time.h> |
ce491cf8 | 41 | #include <plat/dmtimer.h> |
a45c983f | 42 | #include <asm/smp_twd.h> |
cbc94380 | 43 | #include <asm/sched_clock.h> |
4e65331c | 44 | #include "common.h" |
38698bef | 45 | #include <plat/omap_hwmod.h> |
c345c8b0 | 46 | #include <plat/omap_device.h> |
b481113a TKD |
47 | #include <plat/omap-pm.h> |
48 | ||
49 | #include "powerdomain.h" | |
1dbae815 | 50 | |
aa561889 TL |
51 | /* Parent clocks, eventually these will come from the clock framework */ |
52 | ||
53 | #define OMAP2_MPU_SOURCE "sys_ck" | |
54 | #define OMAP3_MPU_SOURCE OMAP2_MPU_SOURCE | |
55 | #define OMAP4_MPU_SOURCE "sys_clkin_ck" | |
56 | #define OMAP2_32K_SOURCE "func_32k_ck" | |
57 | #define OMAP3_32K_SOURCE "omap_32k_fck" | |
58 | #define OMAP4_32K_SOURCE "sys_32k_ck" | |
59 | ||
60 | #ifdef CONFIG_OMAP_32K_TIMER | |
61 | #define OMAP2_CLKEV_SOURCE OMAP2_32K_SOURCE | |
62 | #define OMAP3_CLKEV_SOURCE OMAP3_32K_SOURCE | |
63 | #define OMAP4_CLKEV_SOURCE OMAP4_32K_SOURCE | |
64 | #define OMAP3_SECURE_TIMER 12 | |
65 | #else | |
66 | #define OMAP2_CLKEV_SOURCE OMAP2_MPU_SOURCE | |
67 | #define OMAP3_CLKEV_SOURCE OMAP3_MPU_SOURCE | |
68 | #define OMAP4_CLKEV_SOURCE OMAP4_MPU_SOURCE | |
69 | #define OMAP3_SECURE_TIMER 1 | |
70 | #endif | |
d8328f3b | 71 | |
aa561889 TL |
72 | /* Clockevent code */ |
73 | ||
74 | static struct omap_dm_timer clkev; | |
5a3a388f | 75 | static struct clock_event_device clockevent_gpt; |
1dbae815 | 76 | |
0cd61b68 | 77 | static irqreturn_t omap2_gp_timer_interrupt(int irq, void *dev_id) |
1dbae815 | 78 | { |
5a3a388f KH |
79 | struct clock_event_device *evt = &clockevent_gpt; |
80 | ||
ee17f114 | 81 | __omap_dm_timer_write_status(&clkev, OMAP_TIMER_INT_OVERFLOW); |
1dbae815 | 82 | |
5a3a388f | 83 | evt->event_handler(evt); |
1dbae815 TL |
84 | return IRQ_HANDLED; |
85 | } | |
86 | ||
87 | static struct irqaction omap2_gp_timer_irq = { | |
f36921be | 88 | .name = "gp_timer", |
b30fabad | 89 | .flags = IRQF_DISABLED | IRQF_TIMER | IRQF_IRQPOLL, |
1dbae815 TL |
90 | .handler = omap2_gp_timer_interrupt, |
91 | }; | |
92 | ||
5a3a388f KH |
93 | static int omap2_gp_timer_set_next_event(unsigned long cycles, |
94 | struct clock_event_device *evt) | |
1dbae815 | 95 | { |
ee17f114 | 96 | __omap_dm_timer_load_start(&clkev, OMAP_TIMER_CTRL_ST, |
aa561889 | 97 | 0xffffffff - cycles, 1); |
5a3a388f KH |
98 | |
99 | return 0; | |
100 | } | |
101 | ||
102 | static void omap2_gp_timer_set_mode(enum clock_event_mode mode, | |
103 | struct clock_event_device *evt) | |
104 | { | |
105 | u32 period; | |
106 | ||
ee17f114 | 107 | __omap_dm_timer_stop(&clkev, 1, clkev.rate); |
5a3a388f KH |
108 | |
109 | switch (mode) { | |
110 | case CLOCK_EVT_MODE_PERIODIC: | |
aa561889 | 111 | period = clkev.rate / HZ; |
5a3a388f | 112 | period -= 1; |
aa561889 | 113 | /* Looks like we need to first set the load value separately */ |
ee17f114 | 114 | __omap_dm_timer_write(&clkev, OMAP_TIMER_LOAD_REG, |
aa561889 | 115 | 0xffffffff - period, 1); |
ee17f114 | 116 | __omap_dm_timer_load_start(&clkev, |
aa561889 TL |
117 | OMAP_TIMER_CTRL_AR | OMAP_TIMER_CTRL_ST, |
118 | 0xffffffff - period, 1); | |
5a3a388f KH |
119 | break; |
120 | case CLOCK_EVT_MODE_ONESHOT: | |
121 | break; | |
122 | case CLOCK_EVT_MODE_UNUSED: | |
123 | case CLOCK_EVT_MODE_SHUTDOWN: | |
124 | case CLOCK_EVT_MODE_RESUME: | |
125 | break; | |
126 | } | |
127 | } | |
128 | ||
129 | static struct clock_event_device clockevent_gpt = { | |
f36921be | 130 | .name = "gp_timer", |
5a3a388f KH |
131 | .features = CLOCK_EVT_FEAT_PERIODIC | CLOCK_EVT_FEAT_ONESHOT, |
132 | .shift = 32, | |
133 | .set_next_event = omap2_gp_timer_set_next_event, | |
134 | .set_mode = omap2_gp_timer_set_mode, | |
135 | }; | |
136 | ||
aa561889 TL |
137 | static int __init omap_dm_timer_init_one(struct omap_dm_timer *timer, |
138 | int gptimer_id, | |
139 | const char *fck_source) | |
5a3a388f | 140 | { |
aa561889 TL |
141 | char name[10]; /* 10 = sizeof("gptXX_Xck0") */ |
142 | struct omap_hwmod *oh; | |
6c0c27fd | 143 | struct resource irq_rsrc, mem_rsrc; |
aa561889 TL |
144 | size_t size; |
145 | int res = 0; | |
6c0c27fd | 146 | int r; |
aa561889 TL |
147 | |
148 | sprintf(name, "timer%d", gptimer_id); | |
149 | omap_hwmod_setup_one(name); | |
150 | oh = omap_hwmod_lookup(name); | |
151 | if (!oh) | |
152 | return -ENODEV; | |
153 | ||
6c0c27fd PW |
154 | r = omap_hwmod_get_resource_byname(oh, IORESOURCE_IRQ, NULL, &irq_rsrc); |
155 | if (r) | |
156 | return -ENXIO; | |
157 | timer->irq = irq_rsrc.start; | |
158 | ||
159 | r = omap_hwmod_get_resource_byname(oh, IORESOURCE_MEM, NULL, &mem_rsrc); | |
160 | if (r) | |
161 | return -ENXIO; | |
162 | timer->phys_base = mem_rsrc.start; | |
163 | size = mem_rsrc.end - mem_rsrc.start; | |
aa561889 TL |
164 | |
165 | /* Static mapping, never released */ | |
166 | timer->io_base = ioremap(timer->phys_base, size); | |
167 | if (!timer->io_base) | |
168 | return -ENXIO; | |
169 | ||
170 | /* After the dmtimer is using hwmod these clocks won't be needed */ | |
171 | sprintf(name, "gpt%d_fck", gptimer_id); | |
172 | timer->fclk = clk_get(NULL, name); | |
173 | if (IS_ERR(timer->fclk)) | |
174 | return -ENODEV; | |
175 | ||
aa561889 TL |
176 | omap_hwmod_enable(oh); |
177 | ||
b7b4ff76 JH |
178 | if (omap_dm_timer_reserve_systimer(gptimer_id)) |
179 | return -ENODEV; | |
11a0186f | 180 | |
aa561889 TL |
181 | if (gptimer_id != 12) { |
182 | struct clk *src; | |
183 | ||
184 | src = clk_get(NULL, fck_source); | |
185 | if (IS_ERR(src)) { | |
186 | res = -EINVAL; | |
187 | } else { | |
188 | res = __omap_dm_timer_set_source(timer->fclk, src); | |
189 | if (IS_ERR_VALUE(res)) | |
190 | pr_warning("%s: timer%i cannot set source\n", | |
191 | __func__, gptimer_id); | |
192 | clk_put(src); | |
193 | } | |
194 | } | |
ee17f114 TL |
195 | __omap_dm_timer_init_regs(timer); |
196 | __omap_dm_timer_reset(timer, 1, 1); | |
aa561889 TL |
197 | timer->posted = 1; |
198 | ||
199 | timer->rate = clk_get_rate(timer->fclk); | |
1dbae815 | 200 | |
aa561889 | 201 | timer->reserved = 1; |
38698bef | 202 | |
aa561889 TL |
203 | return res; |
204 | } | |
f248076c | 205 | |
aa561889 TL |
206 | static void __init omap2_gp_clockevent_init(int gptimer_id, |
207 | const char *fck_source) | |
208 | { | |
209 | int res; | |
f248076c | 210 | |
aa561889 TL |
211 | res = omap_dm_timer_init_one(&clkev, gptimer_id, fck_source); |
212 | BUG_ON(res); | |
f248076c | 213 | |
98e182a2 | 214 | omap2_gp_timer_irq.dev_id = (void *)&clkev; |
aa561889 | 215 | setup_irq(clkev.irq, &omap2_gp_timer_irq); |
5a3a388f | 216 | |
ee17f114 | 217 | __omap_dm_timer_int_enable(&clkev, OMAP_TIMER_INT_OVERFLOW); |
aa561889 TL |
218 | |
219 | clockevent_gpt.mult = div_sc(clkev.rate, NSEC_PER_SEC, | |
5a3a388f KH |
220 | clockevent_gpt.shift); |
221 | clockevent_gpt.max_delta_ns = | |
222 | clockevent_delta2ns(0xffffffff, &clockevent_gpt); | |
223 | clockevent_gpt.min_delta_ns = | |
df88acbb AK |
224 | clockevent_delta2ns(3, &clockevent_gpt); |
225 | /* Timer internal resynch latency. */ | |
5a3a388f | 226 | |
320ab2b0 | 227 | clockevent_gpt.cpumask = cpumask_of(0); |
5a3a388f | 228 | clockevents_register_device(&clockevent_gpt); |
aa561889 TL |
229 | |
230 | pr_info("OMAP clockevent source: GPTIMER%d at %lu Hz\n", | |
231 | gptimer_id, clkev.rate); | |
5a3a388f KH |
232 | } |
233 | ||
f248076c | 234 | /* Clocksource code */ |
3d05a3e8 | 235 | static struct omap_dm_timer clksrc; |
1fe97c8f | 236 | static bool use_gptimer_clksrc; |
3d05a3e8 | 237 | |
5a3a388f KH |
238 | /* |
239 | * clocksource | |
240 | */ | |
8e19608e | 241 | static cycle_t clocksource_read_cycles(struct clocksource *cs) |
5a3a388f | 242 | { |
ee17f114 | 243 | return (cycle_t)__omap_dm_timer_read_counter(&clksrc, 1); |
5a3a388f KH |
244 | } |
245 | ||
246 | static struct clocksource clocksource_gpt = { | |
f36921be | 247 | .name = "gp_timer", |
5a3a388f KH |
248 | .rating = 300, |
249 | .read = clocksource_read_cycles, | |
250 | .mask = CLOCKSOURCE_MASK(32), | |
5a3a388f KH |
251 | .flags = CLOCK_SOURCE_IS_CONTINUOUS, |
252 | }; | |
253 | ||
2f0778af | 254 | static u32 notrace dmtimer_read_sched_clock(void) |
cbc94380 | 255 | { |
3d05a3e8 | 256 | if (clksrc.reserved) |
dbc3982a | 257 | return __omap_dm_timer_read_counter(&clksrc, 1); |
5a3a388f | 258 | |
2f0778af | 259 | return 0; |
3d05a3e8 TL |
260 | } |
261 | ||
262 | /* Setup free-running counter for clocksource */ | |
1fe97c8f VH |
263 | static int __init omap2_sync32k_clocksource_init(void) |
264 | { | |
265 | int ret; | |
266 | struct omap_hwmod *oh; | |
267 | void __iomem *vbase; | |
268 | const char *oh_name = "counter_32k"; | |
269 | ||
270 | /* | |
271 | * First check hwmod data is available for sync32k counter | |
272 | */ | |
273 | oh = omap_hwmod_lookup(oh_name); | |
274 | if (!oh || oh->slaves_cnt == 0) | |
275 | return -ENODEV; | |
276 | ||
277 | omap_hwmod_setup_one(oh_name); | |
278 | ||
279 | vbase = omap_hwmod_get_mpu_rt_va(oh); | |
280 | if (!vbase) { | |
281 | pr_warn("%s: failed to get counter_32k resource\n", __func__); | |
282 | return -ENXIO; | |
283 | } | |
284 | ||
285 | ret = omap_hwmod_enable(oh); | |
286 | if (ret) { | |
287 | pr_warn("%s: failed to enable counter_32k module (%d)\n", | |
288 | __func__, ret); | |
289 | return ret; | |
290 | } | |
291 | ||
292 | ret = omap_init_clocksource_32k(vbase); | |
293 | if (ret) { | |
294 | pr_warn("%s: failed to initialize counter_32k as a clocksource (%d)\n", | |
295 | __func__, ret); | |
296 | omap_hwmod_idle(oh); | |
297 | } | |
298 | ||
299 | return ret; | |
300 | } | |
301 | ||
302 | static void __init omap2_gptimer_clocksource_init(int gptimer_id, | |
3d05a3e8 TL |
303 | const char *fck_source) |
304 | { | |
305 | int res; | |
306 | ||
307 | res = omap_dm_timer_init_one(&clksrc, gptimer_id, fck_source); | |
308 | BUG_ON(res); | |
5a3a388f | 309 | |
ee17f114 | 310 | __omap_dm_timer_load_start(&clksrc, |
e9d0b97e | 311 | OMAP_TIMER_CTRL_ST | OMAP_TIMER_CTRL_AR, 0, 1); |
2f0778af | 312 | setup_sched_clock(dmtimer_read_sched_clock, 32, clksrc.rate); |
cbc94380 | 313 | |
3d05a3e8 TL |
314 | if (clocksource_register_hz(&clocksource_gpt, clksrc.rate)) |
315 | pr_err("Could not register clocksource %s\n", | |
316 | clocksource_gpt.name); | |
1fe97c8f VH |
317 | else |
318 | pr_info("OMAP clocksource: GPTIMER%d at %lu Hz\n", | |
319 | gptimer_id, clksrc.rate); | |
320 | } | |
321 | ||
322 | static void __init omap2_clocksource_init(int gptimer_id, | |
323 | const char *fck_source) | |
324 | { | |
325 | /* | |
326 | * First give preference to kernel parameter configuration | |
327 | * by user (clocksource="gp_timer"). | |
328 | * | |
329 | * In case of missing kernel parameter for clocksource, | |
330 | * first check for availability for 32k-sync timer, in case | |
331 | * of failure in finding 32k_counter module or registering | |
332 | * it as clocksource, execution will fallback to gp-timer. | |
333 | */ | |
334 | if (use_gptimer_clksrc == true) | |
335 | omap2_gptimer_clocksource_init(gptimer_id, fck_source); | |
336 | else if (omap2_sync32k_clocksource_init()) | |
337 | /* Fall back to gp-timer code */ | |
338 | omap2_gptimer_clocksource_init(gptimer_id, fck_source); | |
5a3a388f | 339 | } |
5a3a388f | 340 | |
3d05a3e8 TL |
341 | #define OMAP_SYS_TIMER_INIT(name, clkev_nr, clkev_src, \ |
342 | clksrc_nr, clksrc_src) \ | |
e74984e4 TL |
343 | static void __init omap##name##_timer_init(void) \ |
344 | { \ | |
aa561889 | 345 | omap2_gp_clockevent_init((clkev_nr), clkev_src); \ |
1fe97c8f | 346 | omap2_clocksource_init((clksrc_nr), clksrc_src); \ |
e74984e4 TL |
347 | } |
348 | ||
349 | #define OMAP_SYS_TIMER(name) \ | |
350 | struct sys_timer omap##name##_timer = { \ | |
351 | .init = omap##name##_timer_init, \ | |
352 | }; | |
353 | ||
354 | #ifdef CONFIG_ARCH_OMAP2 | |
3d05a3e8 | 355 | OMAP_SYS_TIMER_INIT(2, 1, OMAP2_CLKEV_SOURCE, 2, OMAP2_MPU_SOURCE) |
e74984e4 TL |
356 | OMAP_SYS_TIMER(2) |
357 | #endif | |
358 | ||
359 | #ifdef CONFIG_ARCH_OMAP3 | |
3d05a3e8 | 360 | OMAP_SYS_TIMER_INIT(3, 1, OMAP3_CLKEV_SOURCE, 2, OMAP3_MPU_SOURCE) |
e74984e4 | 361 | OMAP_SYS_TIMER(3) |
3d05a3e8 TL |
362 | OMAP_SYS_TIMER_INIT(3_secure, OMAP3_SECURE_TIMER, OMAP3_CLKEV_SOURCE, |
363 | 2, OMAP3_MPU_SOURCE) | |
e74984e4 TL |
364 | OMAP_SYS_TIMER(3_secure) |
365 | #endif | |
366 | ||
08f30989 AM |
367 | #ifdef CONFIG_SOC_AM33XX |
368 | OMAP_SYS_TIMER_INIT(3_am33xx, 1, OMAP4_MPU_SOURCE, 2, OMAP4_MPU_SOURCE) | |
369 | OMAP_SYS_TIMER(3_am33xx) | |
370 | #endif | |
371 | ||
e74984e4 | 372 | #ifdef CONFIG_ARCH_OMAP4 |
39e1d4c1 | 373 | #ifdef CONFIG_LOCAL_TIMERS |
a45c983f MZ |
374 | static DEFINE_TWD_LOCAL_TIMER(twd_local_timer, |
375 | OMAP44XX_LOCAL_TWD_BASE, | |
376 | OMAP44XX_IRQ_LOCALTIMER); | |
39e1d4c1 | 377 | #endif |
a45c983f MZ |
378 | |
379 | static void __init omap4_timer_init(void) | |
380 | { | |
aa561889 | 381 | omap2_gp_clockevent_init(1, OMAP4_CLKEV_SOURCE); |
1fe97c8f | 382 | omap2_clocksource_init(2, OMAP4_MPU_SOURCE); |
a45c983f MZ |
383 | #ifdef CONFIG_LOCAL_TIMERS |
384 | /* Local timers are not supprted on OMAP4430 ES1.0 */ | |
385 | if (omap_rev() != OMAP4430_REV_ES1_0) { | |
386 | int err; | |
387 | ||
388 | err = twd_local_timer_register(&twd_local_timer); | |
389 | if (err) | |
390 | pr_err("twd_local_timer_register failed %d\n", err); | |
391 | } | |
392 | #endif | |
1dbae815 | 393 | } |
e74984e4 TL |
394 | OMAP_SYS_TIMER(4) |
395 | #endif | |
c345c8b0 | 396 | |
c345c8b0 TKD |
397 | /** |
398 | * omap_timer_init - build and register timer device with an | |
399 | * associated timer hwmod | |
400 | * @oh: timer hwmod pointer to be used to build timer device | |
401 | * @user: parameter that can be passed from calling hwmod API | |
402 | * | |
403 | * Called by omap_hwmod_for_each_by_class to register each of the timer | |
404 | * devices present in the system. The number of timer devices is known | |
405 | * by parsing through the hwmod database for a given class name. At the | |
406 | * end of function call memory is allocated for timer device and it is | |
407 | * registered to the framework ready to be proved by the driver. | |
408 | */ | |
409 | static int __init omap_timer_init(struct omap_hwmod *oh, void *unused) | |
410 | { | |
411 | int id; | |
412 | int ret = 0; | |
413 | char *name = "omap_timer"; | |
414 | struct dmtimer_platform_data *pdata; | |
c541c15f | 415 | struct platform_device *pdev; |
c345c8b0 TKD |
416 | struct omap_timer_capability_dev_attr *timer_dev_attr; |
417 | ||
418 | pr_debug("%s: %s\n", __func__, oh->name); | |
419 | ||
420 | /* on secure device, do not register secure timer */ | |
421 | timer_dev_attr = oh->dev_attr; | |
422 | if (omap_type() != OMAP2_DEVICE_TYPE_GP && timer_dev_attr) | |
423 | if (timer_dev_attr->timer_capability == OMAP_TIMER_SECURE) | |
424 | return ret; | |
425 | ||
426 | pdata = kzalloc(sizeof(*pdata), GFP_KERNEL); | |
427 | if (!pdata) { | |
428 | pr_err("%s: No memory for [%s]\n", __func__, oh->name); | |
429 | return -ENOMEM; | |
430 | } | |
431 | ||
432 | /* | |
433 | * Extract the IDs from name field in hwmod database | |
434 | * and use the same for constructing ids' for the | |
435 | * timer devices. In a way, we are avoiding usage of | |
436 | * static variable witin the function to do the same. | |
437 | * CAUTION: We have to be careful and make sure the | |
438 | * name in hwmod database does not change in which case | |
439 | * we might either make corresponding change here or | |
440 | * switch back static variable mechanism. | |
441 | */ | |
442 | sscanf(oh->name, "timer%2d", &id); | |
443 | ||
d1c1691b JH |
444 | if (timer_dev_attr) |
445 | pdata->timer_capability = timer_dev_attr->timer_capability; | |
0dad9fae | 446 | |
c541c15f | 447 | pdev = omap_device_build(name, id, oh, pdata, sizeof(*pdata), |
c16ae1e6 | 448 | NULL, 0, 0); |
c345c8b0 | 449 | |
c541c15f | 450 | if (IS_ERR(pdev)) { |
c345c8b0 TKD |
451 | pr_err("%s: Can't build omap_device for %s: %s.\n", |
452 | __func__, name, oh->name); | |
453 | ret = -EINVAL; | |
454 | } | |
455 | ||
456 | kfree(pdata); | |
457 | ||
458 | return ret; | |
459 | } | |
3392cdd3 TKD |
460 | |
461 | /** | |
462 | * omap2_dm_timer_init - top level regular device initialization | |
463 | * | |
464 | * Uses dedicated hwmod api to parse through hwmod database for | |
465 | * given class name and then build and register the timer device. | |
466 | */ | |
467 | static int __init omap2_dm_timer_init(void) | |
468 | { | |
469 | int ret; | |
470 | ||
471 | ret = omap_hwmod_for_each_by_class("timer", omap_timer_init, NULL); | |
472 | if (unlikely(ret)) { | |
473 | pr_err("%s: device registration failed.\n", __func__); | |
474 | return -EINVAL; | |
475 | } | |
476 | ||
477 | return 0; | |
478 | } | |
479 | arch_initcall(omap2_dm_timer_init); | |
1fe97c8f VH |
480 | |
481 | /** | |
482 | * omap2_override_clocksource - clocksource override with user configuration | |
483 | * | |
484 | * Allows user to override default clocksource, using kernel parameter | |
485 | * clocksource="gp_timer" (For all OMAP2PLUS architectures) | |
486 | * | |
487 | * Note that, here we are using same standard kernel parameter "clocksource=", | |
488 | * and not introducing any OMAP specific interface. | |
489 | */ | |
490 | static int __init omap2_override_clocksource(char *str) | |
491 | { | |
492 | if (!str) | |
493 | return 0; | |
494 | /* | |
495 | * For OMAP architecture, we only have two options | |
496 | * - sync_32k (default) | |
497 | * - gp_timer (sys_clk based) | |
498 | */ | |
499 | if (!strcmp(str, "gp_timer")) | |
500 | use_gptimer_clksrc = true; | |
501 | ||
502 | return 0; | |
503 | } | |
504 | early_param("clocksource", omap2_override_clocksource); |