Merge tag 'vexpress-for-v4.6/dt-updates-2' of git://git.kernel.org/pub/scm/linux...
[deliverable/linux.git] / arch / arm / mach-omap2 / timer.c
CommitLineData
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>
eed0de27 39#include <linux/of.h>
9725f445
JH
40#include <linux/of_address.h>
41#include <linux/of_irq.h>
40fc3bb5
JH
42#include <linux/platform_device.h>
43#include <linux/platform_data/dmtimer-omap.h>
38ff87f7 44#include <linux/sched_clock.h>
f8ce2547 45
1dbae815 46#include <asm/mach/time.h>
a45c983f 47#include <asm/smp_twd.h>
7d7e1eba 48
2a296c8f 49#include "omap_hwmod.h"
25c7d49e 50#include "omap_device.h"
5c2e8852 51#include <plat/counter-32k.h>
7d7e1eba 52#include <plat/dmtimer.h>
1d5aef49 53#include "omap-pm.h"
b481113a 54
dbc04161 55#include "soc.h"
7d7e1eba 56#include "common.h"
afc9d590 57#include "control.h"
b481113a 58#include "powerdomain.h"
5523e409 59#include "omap-secure.h"
1dbae815 60
fa6d79d2
SS
61#define REALTIME_COUNTER_BASE 0x48243200
62#define INCREMENTER_NUMERATOR_OFFSET 0x10
63#define INCREMENTER_DENUMERATOR_RELOAD_OFFSET 0x14
64#define NUMERATOR_DENUMERATOR_MASK 0xfffff000
65
aa561889
TL
66/* Clockevent code */
67
68static struct omap_dm_timer clkev;
5a3a388f 69static struct clock_event_device clockevent_gpt;
1dbae815 70
d5da94b8 71#ifdef CONFIG_SOC_HAS_REALTIME_COUNTER
5523e409
S
72static unsigned long arch_timer_freq;
73
74void set_cntfreq(void)
75{
76 omap_smc1(OMAP5_DRA7_MON_SET_CNTFRQ_INDEX, arch_timer_freq);
77}
d5da94b8 78#endif
1dbae815 79
0cd61b68 80static irqreturn_t omap2_gp_timer_interrupt(int irq, void *dev_id)
1dbae815 81{
5a3a388f
KH
82 struct clock_event_device *evt = &clockevent_gpt;
83
ee17f114 84 __omap_dm_timer_write_status(&clkev, OMAP_TIMER_INT_OVERFLOW);
1dbae815 85
5a3a388f 86 evt->event_handler(evt);
1dbae815
TL
87 return IRQ_HANDLED;
88}
89
90static struct irqaction omap2_gp_timer_irq = {
f36921be 91 .name = "gp_timer",
fe806d04 92 .flags = IRQF_TIMER | IRQF_IRQPOLL,
1dbae815
TL
93 .handler = omap2_gp_timer_interrupt,
94};
95
5a3a388f
KH
96static int omap2_gp_timer_set_next_event(unsigned long cycles,
97 struct clock_event_device *evt)
1dbae815 98{
ee17f114 99 __omap_dm_timer_load_start(&clkev, OMAP_TIMER_CTRL_ST,
971d0254 100 0xffffffff - cycles, OMAP_TIMER_POSTED);
5a3a388f
KH
101
102 return 0;
103}
104
74364615
VK
105static int omap2_gp_timer_shutdown(struct clock_event_device *evt)
106{
107 __omap_dm_timer_stop(&clkev, OMAP_TIMER_POSTED, clkev.rate);
108 return 0;
109}
110
111static int omap2_gp_timer_set_periodic(struct clock_event_device *evt)
5a3a388f
KH
112{
113 u32 period;
114
971d0254 115 __omap_dm_timer_stop(&clkev, OMAP_TIMER_POSTED, clkev.rate);
5a3a388f 116
74364615
VK
117 period = clkev.rate / HZ;
118 period -= 1;
119 /* Looks like we need to first set the load value separately */
120 __omap_dm_timer_write(&clkev, OMAP_TIMER_LOAD_REG, 0xffffffff - period,
121 OMAP_TIMER_POSTED);
122 __omap_dm_timer_load_start(&clkev,
123 OMAP_TIMER_CTRL_AR | OMAP_TIMER_CTRL_ST,
124 0xffffffff - period, OMAP_TIMER_POSTED);
125 return 0;
5a3a388f
KH
126}
127
128static struct clock_event_device clockevent_gpt = {
74364615
VK
129 .features = CLOCK_EVT_FEAT_PERIODIC |
130 CLOCK_EVT_FEAT_ONESHOT,
131 .rating = 300,
132 .set_next_event = omap2_gp_timer_set_next_event,
133 .set_state_shutdown = omap2_gp_timer_shutdown,
134 .set_state_periodic = omap2_gp_timer_set_periodic,
135 .set_state_oneshot = omap2_gp_timer_shutdown,
136 .tick_resume = omap2_gp_timer_shutdown,
5a3a388f
KH
137};
138
ad24bde8
JH
139static struct property device_disabled = {
140 .name = "status",
141 .length = sizeof("disabled"),
142 .value = "disabled",
143};
144
31957609 145static const struct of_device_id omap_timer_match[] __initconst = {
002e1ec5
JH
146 { .compatible = "ti,omap2420-timer", },
147 { .compatible = "ti,omap3430-timer", },
148 { .compatible = "ti,omap4430-timer", },
149 { .compatible = "ti,omap5430-timer", },
132754e4
TL
150 { .compatible = "ti,dm814-timer", },
151 { .compatible = "ti,dm816-timer", },
002e1ec5
JH
152 { .compatible = "ti,am335x-timer", },
153 { .compatible = "ti,am335x-timer-1ms", },
ad24bde8
JH
154 { }
155};
156
9725f445
JH
157/**
158 * omap_get_timer_dt - get a timer using device-tree
159 * @match - device-tree match structure for matching a device type
160 * @property - optional timer property to match
161 *
162 * Helper function to get a timer during early boot using device-tree for use
163 * as kernel system timer. Optionally, the property argument can be used to
164 * select a timer with a specific property. Once a timer is found then mark
165 * the timer node in device-tree as disabled, to prevent the kernel from
166 * registering this timer as a platform device and so no one else can use it.
167 */
31957609 168static struct device_node * __init omap_get_timer_dt(const struct of_device_id *match,
9725f445
JH
169 const char *property)
170{
171 struct device_node *np;
172
173 for_each_matching_node(np, match) {
034bf091 174 if (!of_device_is_available(np))
9725f445 175 continue;
9725f445 176
034bf091 177 if (property && !of_get_property(np, property, NULL))
9725f445 178 continue;
9725f445 179
2eb03937
JH
180 if (!property && (of_get_property(np, "ti,timer-alwon", NULL) ||
181 of_get_property(np, "ti,timer-dsp", NULL) ||
182 of_get_property(np, "ti,timer-pwm", NULL) ||
183 of_get_property(np, "ti,timer-secure", NULL)))
184 continue;
185
bf4c9449
FB
186 if (!of_device_is_compatible(np, "ti,omap-counter32k"))
187 of_add_property(np, &device_disabled);
9725f445
JH
188 return np;
189 }
190
191 return NULL;
192}
193
ad24bde8
JH
194/**
195 * omap_dmtimer_init - initialisation function when device tree is used
196 *
ed5a4c62
SA
197 * For secure OMAP3/DRA7xx devices, timers with device type "timer-secure"
198 * cannot be used by the kernel as they are reserved. Therefore, to prevent the
ad24bde8
JH
199 * kernel registering these devices remove them dynamically from the device
200 * tree on boot.
201 */
bf85f205 202static void __init omap_dmtimer_init(void)
ad24bde8
JH
203{
204 struct device_node *np;
205
ed5a4c62 206 if (!cpu_is_omap34xx() && !soc_is_dra7xx())
ad24bde8
JH
207 return;
208
209 /* If we are a secure device, remove any secure timer nodes */
210 if ((omap_type() != OMAP2_DEVICE_TYPE_GP)) {
9725f445 211 np = omap_get_timer_dt(omap_timer_match, "ti,timer-secure");
9a0cb985 212 of_node_put(np);
ad24bde8
JH
213 }
214}
215
bfd6d021
JH
216/**
217 * omap_dm_timer_get_errata - get errata flags for a timer
218 *
219 * Get the timer errata flags that are specific to the OMAP device being used.
220 */
bf85f205 221static u32 __init omap_dm_timer_get_errata(void)
bfd6d021
JH
222{
223 if (cpu_is_omap24xx())
224 return 0;
225
226 return OMAP_TIMER_ERRATA_I103_I767;
227}
228
aa561889 229static int __init omap_dm_timer_init_one(struct omap_dm_timer *timer,
e95ea43a
JH
230 const char *fck_source,
231 const char *property,
232 const char **timer_name,
233 int posted)
5a3a388f 234{
aa561889 235 char name[10]; /* 10 = sizeof("gptXX_Xck0") */
37bd6ca8 236 const char *oh_name = NULL;
9725f445 237 struct device_node *np;
aa561889 238 struct omap_hwmod *oh;
61b001c5 239 struct resource irq, mem;
a7990a19 240 struct clk *src;
f88095ba 241 int r = 0;
aa561889 242
9725f445 243 if (of_have_populated_dt()) {
61338d59 244 np = omap_get_timer_dt(omap_timer_match, property);
9725f445
JH
245 if (!np)
246 return -ENODEV;
247
248 of_property_read_string_index(np, "ti,hwmods", 0, &oh_name);
249 if (!oh_name)
250 return -ENODEV;
251
252 timer->irq = irq_of_parse_and_map(np, 0);
253 if (!timer->irq)
254 return -ENXIO;
255
256 timer->io_base = of_iomap(np, 0);
257
258 of_node_put(np);
259 } else {
8f6924dc 260 if (omap_dm_timer_reserve_systimer(timer->id))
9725f445
JH
261 return -ENODEV;
262
8f6924dc 263 sprintf(name, "timer%d", timer->id);
9725f445
JH
264 oh_name = name;
265 }
266
9725f445 267 oh = omap_hwmod_lookup(oh_name);
aa561889
TL
268 if (!oh)
269 return -ENODEV;
270
e95ea43a
JH
271 *timer_name = oh->name;
272
9725f445
JH
273 if (!of_have_populated_dt()) {
274 r = omap_hwmod_get_resource_byname(oh, IORESOURCE_IRQ, NULL,
61b001c5 275 &irq);
9725f445
JH
276 if (r)
277 return -ENXIO;
61b001c5 278 timer->irq = irq.start;
9725f445
JH
279
280 r = omap_hwmod_get_resource_byname(oh, IORESOURCE_MEM, NULL,
61b001c5 281 &mem);
9725f445
JH
282 if (r)
283 return -ENXIO;
9725f445
JH
284
285 /* Static mapping, never released */
61b001c5 286 timer->io_base = ioremap(mem.start, mem.end - mem.start);
9725f445 287 }
aa561889 288
aa561889
TL
289 if (!timer->io_base)
290 return -ENXIO;
291
292 /* After the dmtimer is using hwmod these clocks won't be needed */
ae6df418 293 timer->fclk = clk_get(NULL, omap_hwmod_get_main_clk(oh));
aa561889 294 if (IS_ERR(timer->fclk))
a7990a19 295 return PTR_ERR(timer->fclk);
aa561889 296
a7990a19
JH
297 src = clk_get(NULL, fck_source);
298 if (IS_ERR(src))
299 return PTR_ERR(src);
aa561889 300
874b300a
TL
301 WARN(clk_set_parent(timer->fclk, src) < 0,
302 "Cannot set timer parent clock, no PLL clock driver?");
b1538832 303
a7990a19
JH
304 clk_put(src);
305
b1538832
JH
306 omap_hwmod_setup_one(oh_name);
307 omap_hwmod_enable(oh);
ee17f114 308 __omap_dm_timer_init_regs(timer);
aa561889 309
bfd6d021
JH
310 if (posted)
311 __omap_dm_timer_enable_posted(timer);
312
313 /* Check that the intended posted configuration matches the actual */
314 if (posted != timer->posted)
315 return -EINVAL;
1dbae815 316
bfd6d021 317 timer->rate = clk_get_rate(timer->fclk);
aa561889 318 timer->reserved = 1;
38698bef 319
f88095ba 320 return r;
aa561889 321}
f248076c 322
0b3e6fca
GS
323#if !defined(CONFIG_SMP) && defined(CONFIG_GENERIC_CLOCKEVENTS_BROADCAST)
324void tick_broadcast(const struct cpumask *mask)
325{
326}
327#endif
328
aa561889 329static void __init omap2_gp_clockevent_init(int gptimer_id,
9725f445
JH
330 const char *fck_source,
331 const char *property)
aa561889
TL
332{
333 int res;
f248076c 334
8f6924dc 335 clkev.id = gptimer_id;
bfd6d021
JH
336 clkev.errata = omap_dm_timer_get_errata();
337
338 /*
339 * For clock-event timers we never read the timer counter and
340 * so we are not impacted by errata i103 and i767. Therefore,
341 * we can safely ignore this errata for clock-event timers.
342 */
343 __omap_dm_timer_override_errata(&clkev, OMAP_TIMER_ERRATA_I103_I767);
344
8f6924dc 345 res = omap_dm_timer_init_one(&clkev, fck_source, property,
e95ea43a 346 &clockevent_gpt.name, OMAP_TIMER_POSTED);
aa561889 347 BUG_ON(res);
f248076c 348
a032d33b 349 omap2_gp_timer_irq.dev_id = &clkev;
aa561889 350 setup_irq(clkev.irq, &omap2_gp_timer_irq);
5a3a388f 351
ee17f114 352 __omap_dm_timer_int_enable(&clkev, OMAP_TIMER_INT_OVERFLOW);
aa561889 353
11d6ec2e
SS
354 clockevent_gpt.cpumask = cpu_possible_mask;
355 clockevent_gpt.irq = omap_dm_timer_get_irq(&clkev);
838a2ae8
SG
356 clockevents_config_and_register(&clockevent_gpt, clkev.rate,
357 3, /* Timer internal resynch latency */
358 0xffffffff);
aa561889 359
e95ea43a
JH
360 pr_info("OMAP clockevent source: %s at %lu Hz\n", clockevent_gpt.name,
361 clkev.rate);
5a3a388f
KH
362}
363
f248076c 364/* Clocksource code */
3d05a3e8 365static struct omap_dm_timer clksrc;
332f1931 366static bool use_gptimer_clksrc __initdata;
3d05a3e8 367
5a3a388f
KH
368/*
369 * clocksource
370 */
8e19608e 371static cycle_t clocksource_read_cycles(struct clocksource *cs)
5a3a388f 372{
971d0254 373 return (cycle_t)__omap_dm_timer_read_counter(&clksrc,
bfd6d021 374 OMAP_TIMER_NONPOSTED);
5a3a388f
KH
375}
376
377static struct clocksource clocksource_gpt = {
5a3a388f
KH
378 .rating = 300,
379 .read = clocksource_read_cycles,
380 .mask = CLOCKSOURCE_MASK(32),
5a3a388f
KH
381 .flags = CLOCK_SOURCE_IS_CONTINUOUS,
382};
383
f99ba47c 384static u64 notrace dmtimer_read_sched_clock(void)
cbc94380 385{
3d05a3e8 386 if (clksrc.reserved)
971d0254 387 return __omap_dm_timer_read_counter(&clksrc,
bfd6d021 388 OMAP_TIMER_NONPOSTED);
5a3a388f 389
2f0778af 390 return 0;
3d05a3e8
TL
391}
392
31957609 393static const struct of_device_id omap_counter_match[] __initconst = {
258e84af
JH
394 { .compatible = "ti,omap-counter32k", },
395 { }
396};
397
3d05a3e8 398/* Setup free-running counter for clocksource */
e0c3e27c 399static int __init __maybe_unused omap2_sync32k_clocksource_init(void)
1fe97c8f
VH
400{
401 int ret;
9883f7c8 402 struct device_node *np = NULL;
1fe97c8f 403 struct omap_hwmod *oh;
1fe97c8f
VH
404 const char *oh_name = "counter_32k";
405
9883f7c8
JH
406 /*
407 * If device-tree is present, then search the DT blob
408 * to see if the 32kHz counter is supported.
409 */
410 if (of_have_populated_dt()) {
411 np = omap_get_timer_dt(omap_counter_match, NULL);
412 if (!np)
413 return -ENODEV;
414
415 of_property_read_string_index(np, "ti,hwmods", 0, &oh_name);
416 if (!oh_name)
417 return -ENODEV;
418 }
419
1fe97c8f
VH
420 /*
421 * First check hwmod data is available for sync32k counter
422 */
423 oh = omap_hwmod_lookup(oh_name);
424 if (!oh || oh->slaves_cnt == 0)
425 return -ENODEV;
426
427 omap_hwmod_setup_one(oh_name);
428
1fe97c8f
VH
429 ret = omap_hwmod_enable(oh);
430 if (ret) {
431 pr_warn("%s: failed to enable counter_32k module (%d)\n",
432 __func__, ret);
433 return ret;
434 }
435
bf4c9449
FB
436 if (!of_have_populated_dt()) {
437 void __iomem *vbase;
1fe97c8f 438
bf4c9449 439 vbase = omap_hwmod_get_mpu_rt_va(oh);
1fe97c8f 440
bf4c9449
FB
441 ret = omap_init_clocksource_32k(vbase);
442 if (ret) {
443 pr_warn("%s: failed to initialize counter_32k as a clocksource (%d)\n",
444 __func__, ret);
445 omap_hwmod_idle(oh);
446 }
447 }
1fe97c8f
VH
448 return ret;
449}
450
451static void __init omap2_gptimer_clocksource_init(int gptimer_id,
2eb03937
JH
452 const char *fck_source,
453 const char *property)
3d05a3e8
TL
454{
455 int res;
456
8f6924dc 457 clksrc.id = gptimer_id;
bfd6d021
JH
458 clksrc.errata = omap_dm_timer_get_errata();
459
8f6924dc 460 res = omap_dm_timer_init_one(&clksrc, fck_source, property,
e95ea43a 461 &clocksource_gpt.name,
bfd6d021 462 OMAP_TIMER_NONPOSTED);
3d05a3e8 463 BUG_ON(res);
5a3a388f 464
ee17f114 465 __omap_dm_timer_load_start(&clksrc,
971d0254 466 OMAP_TIMER_CTRL_ST | OMAP_TIMER_CTRL_AR, 0,
bfd6d021 467 OMAP_TIMER_NONPOSTED);
f99ba47c 468 sched_clock_register(dmtimer_read_sched_clock, 32, clksrc.rate);
cbc94380 469
3d05a3e8
TL
470 if (clocksource_register_hz(&clocksource_gpt, clksrc.rate))
471 pr_err("Could not register clocksource %s\n",
472 clocksource_gpt.name);
1fe97c8f 473 else
e95ea43a
JH
474 pr_info("OMAP clocksource: %s at %lu Hz\n",
475 clocksource_gpt.name, clksrc.rate);
1fe97c8f
VH
476}
477
3afbb9af
FB
478static void __init __omap_sync32k_timer_init(int clkev_nr, const char *clkev_src,
479 const char *clkev_prop, int clksrc_nr, const char *clksrc_src,
480 const char *clksrc_prop, bool gptimer)
481{
482 omap_clk_init();
483 omap_dmtimer_init();
484 omap2_gp_clockevent_init(clkev_nr, clkev_src, clkev_prop);
485
486 /* Enable the use of clocksource="gp_timer" kernel parameter */
487 if (use_gptimer_clksrc || gptimer)
488 omap2_gptimer_clocksource_init(clksrc_nr, clksrc_src,
489 clksrc_prop);
490 else
491 omap2_sync32k_clocksource_init();
492}
493
6f82e25d 494void __init omap_init_time(void)
3afbb9af
FB
495{
496 __omap_sync32k_timer_init(1, "timer_32k_ck", "ti,timer-alwon",
497 2, "timer_sys_ck", NULL, false);
9c46ffcd
FB
498
499 if (of_have_populated_dt())
a5e1d715 500 clocksource_probe();
3afbb9af
FB
501}
502
503#if defined(CONFIG_ARCH_OMAP3) || defined(CONFIG_SOC_AM43XX)
504void __init omap3_secure_sync32k_timer_init(void)
505{
506 __omap_sync32k_timer_init(12, "secure_32k_fck", "ti,timer-secure",
507 2, "timer_sys_ck", NULL, false);
508}
509#endif /* CONFIG_ARCH_OMAP3 */
510
511#if defined(CONFIG_ARCH_OMAP3) || defined(CONFIG_SOC_AM33XX)
512void __init omap3_gptimer_timer_init(void)
513{
514 __omap_sync32k_timer_init(2, "timer_sys_ck", NULL,
515 1, "timer_sys_ck", "ti,timer-alwon", true);
516}
517#endif
518
519#if defined(CONFIG_ARCH_OMAP4) || defined(CONFIG_SOC_OMAP5) || \
520 defined(CONFIG_SOC_DRA7XX) || defined(CONFIG_SOC_AM43XX)
521static void __init omap4_sync32k_timer_init(void)
522{
523 __omap_sync32k_timer_init(1, "timer_32k_ck", "ti,timer-alwon",
524 2, "sys_clkin_ck", NULL, false);
525}
526
527void __init omap4_local_timer_init(void)
528{
529 omap4_sync32k_timer_init();
a5e1d715 530 clocksource_probe();
3afbb9af
FB
531}
532#endif
533
534#if defined(CONFIG_SOC_OMAP5) || defined(CONFIG_SOC_DRA7XX)
535
fa6d79d2
SS
536/*
537 * The realtime counter also called master counter, is a free-running
538 * counter, which is related to real time. It produces the count used
539 * by the CPU local timer peripherals in the MPU cluster. The timer counts
540 * at a rate of 6.144 MHz. Because the device operates on different clocks
541 * in different power modes, the master counter shifts operation between
542 * clocks, adjusting the increment per clock in hardware accordingly to
543 * maintain a constant count rate.
544 */
545static void __init realtime_counter_init(void)
546{
3afbb9af 547#ifdef CONFIG_SOC_HAS_REALTIME_COUNTER
fa6d79d2
SS
548 void __iomem *base;
549 static struct clk *sys_clk;
550 unsigned long rate;
afc9d590
LS
551 unsigned int reg;
552 unsigned long long num, den;
fa6d79d2
SS
553
554 base = ioremap(REALTIME_COUNTER_BASE, SZ_32);
555 if (!base) {
556 pr_err("%s: ioremap failed\n", __func__);
557 return;
558 }
7f585bbf 559 sys_clk = clk_get(NULL, "sys_clkin");
533b2981 560 if (IS_ERR(sys_clk)) {
fa6d79d2
SS
561 pr_err("%s: failed to get system clock handle\n", __func__);
562 iounmap(base);
563 return;
564 }
565
566 rate = clk_get_rate(sys_clk);
afc9d590
LS
567
568 if (soc_is_dra7xx()) {
569 /*
570 * Errata i856 says the 32.768KHz crystal does not start at
571 * power on, so the CPU falls back to an emulated 32KHz clock
572 * based on sysclk / 610 instead. This causes the master counter
573 * frequency to not be 6.144MHz but at sysclk / 610 * 375 / 2
574 * (OR sysclk * 75 / 244)
575 *
576 * This affects at least the DRA7/AM572x 1.0, 1.1 revisions.
577 * Of course any board built without a populated 32.768KHz
578 * crystal would also need this fix even if the CPU is fixed
579 * later.
580 *
581 * Either case can be detected by using the two speedselect bits
582 * If they are not 0, then the 32.768KHz clock driving the
583 * coarse counter that corrects the fine counter every time it
584 * ticks is actually rate/610 rather than 32.768KHz and we
585 * should compensate to avoid the 570ppm (at 20MHz, much worse
586 * at other rates) too fast system time.
587 */
588 reg = omap_ctrl_readl(DRA7_CTRL_CORE_BOOTSTRAP);
589 if (reg & DRA7_SPEEDSELECT_MASK) {
590 num = 75;
591 den = 244;
592 goto sysclk1_based;
593 }
594 }
595
fa6d79d2
SS
596 /* Numerator/denumerator values refer TRM Realtime Counter section */
597 switch (rate) {
572b24e6 598 case 12000000:
fa6d79d2
SS
599 num = 64;
600 den = 125;
601 break;
572b24e6 602 case 13000000:
fa6d79d2
SS
603 num = 768;
604 den = 1625;
605 break;
606 case 19200000:
607 num = 8;
608 den = 25;
609 break;
38a1981c
S
610 case 20000000:
611 num = 192;
612 den = 625;
613 break;
572b24e6 614 case 26000000:
fa6d79d2
SS
615 num = 384;
616 den = 1625;
617 break;
572b24e6 618 case 27000000:
fa6d79d2
SS
619 num = 256;
620 den = 1125;
621 break;
622 case 38400000:
623 default:
624 /* Program it for 38.4 MHz */
625 num = 4;
626 den = 25;
627 break;
628 }
629
afc9d590 630sysclk1_based:
fa6d79d2 631 /* Program numerator and denumerator registers */
edfaf05c 632 reg = readl_relaxed(base + INCREMENTER_NUMERATOR_OFFSET) &
fa6d79d2
SS
633 NUMERATOR_DENUMERATOR_MASK;
634 reg |= num;
edfaf05c 635 writel_relaxed(reg, base + INCREMENTER_NUMERATOR_OFFSET);
fa6d79d2 636
edfaf05c 637 reg = readl_relaxed(base + INCREMENTER_DENUMERATOR_RELOAD_OFFSET) &
fa6d79d2
SS
638 NUMERATOR_DENUMERATOR_MASK;
639 reg |= den;
edfaf05c 640 writel_relaxed(reg, base + INCREMENTER_DENUMERATOR_RELOAD_OFFSET);
fa6d79d2 641
afc9d590 642 arch_timer_freq = DIV_ROUND_UP_ULL(rate * num, den);
5523e409
S
643 set_cntfreq();
644
fa6d79d2 645 iounmap(base);
fa6d79d2 646#endif
6f80b3bb
IG
647}
648
6bb27d73 649void __init omap5_realtime_timer_init(void)
fa6d79d2 650{
00ea4d56 651 omap4_sync32k_timer_init();
fa6d79d2 652 realtime_counter_init();
3c7c5dab 653
3722ed23 654 clocksource_probe();
fa6d79d2 655}
0b8214fe 656#endif /* CONFIG_SOC_OMAP5 || CONFIG_SOC_DRA7XX */
37b3280d 657
c345c8b0
TKD
658/**
659 * omap_timer_init - build and register timer device with an
660 * associated timer hwmod
661 * @oh: timer hwmod pointer to be used to build timer device
662 * @user: parameter that can be passed from calling hwmod API
663 *
664 * Called by omap_hwmod_for_each_by_class to register each of the timer
665 * devices present in the system. The number of timer devices is known
666 * by parsing through the hwmod database for a given class name. At the
667 * end of function call memory is allocated for timer device and it is
668 * registered to the framework ready to be proved by the driver.
669 */
670static int __init omap_timer_init(struct omap_hwmod *oh, void *unused)
671{
672 int id;
673 int ret = 0;
674 char *name = "omap_timer";
675 struct dmtimer_platform_data *pdata;
c541c15f 676 struct platform_device *pdev;
c345c8b0
TKD
677 struct omap_timer_capability_dev_attr *timer_dev_attr;
678
679 pr_debug("%s: %s\n", __func__, oh->name);
680
681 /* on secure device, do not register secure timer */
682 timer_dev_attr = oh->dev_attr;
683 if (omap_type() != OMAP2_DEVICE_TYPE_GP && timer_dev_attr)
684 if (timer_dev_attr->timer_capability == OMAP_TIMER_SECURE)
685 return ret;
686
687 pdata = kzalloc(sizeof(*pdata), GFP_KERNEL);
688 if (!pdata) {
689 pr_err("%s: No memory for [%s]\n", __func__, oh->name);
690 return -ENOMEM;
691 }
692
693 /*
694 * Extract the IDs from name field in hwmod database
695 * and use the same for constructing ids' for the
696 * timer devices. In a way, we are avoiding usage of
697 * static variable witin the function to do the same.
698 * CAUTION: We have to be careful and make sure the
699 * name in hwmod database does not change in which case
700 * we might either make corresponding change here or
701 * switch back static variable mechanism.
702 */
703 sscanf(oh->name, "timer%2d", &id);
704
d1c1691b
JH
705 if (timer_dev_attr)
706 pdata->timer_capability = timer_dev_attr->timer_capability;
0dad9fae 707
bfd6d021 708 pdata->timer_errata = omap_dm_timer_get_errata();
6e740f9a
TL
709 pdata->get_context_loss_count = omap_pm_get_dev_context_loss_count;
710
c1d1cd59 711 pdev = omap_device_build(name, id, oh, pdata, sizeof(*pdata));
c345c8b0 712
c541c15f 713 if (IS_ERR(pdev)) {
c345c8b0
TKD
714 pr_err("%s: Can't build omap_device for %s: %s.\n",
715 __func__, name, oh->name);
716 ret = -EINVAL;
717 }
718
719 kfree(pdata);
720
721 return ret;
722}
3392cdd3
TKD
723
724/**
725 * omap2_dm_timer_init - top level regular device initialization
726 *
727 * Uses dedicated hwmod api to parse through hwmod database for
728 * given class name and then build and register the timer device.
729 */
730static int __init omap2_dm_timer_init(void)
731{
732 int ret;
733
9725f445
JH
734 /* If dtb is there, the devices will be created dynamically */
735 if (of_have_populated_dt())
736 return -ENODEV;
737
3392cdd3
TKD
738 ret = omap_hwmod_for_each_by_class("timer", omap_timer_init, NULL);
739 if (unlikely(ret)) {
740 pr_err("%s: device registration failed.\n", __func__);
741 return -EINVAL;
742 }
743
744 return 0;
745}
b76c8b19 746omap_arch_initcall(omap2_dm_timer_init);
1fe97c8f
VH
747
748/**
749 * omap2_override_clocksource - clocksource override with user configuration
750 *
751 * Allows user to override default clocksource, using kernel parameter
752 * clocksource="gp_timer" (For all OMAP2PLUS architectures)
753 *
754 * Note that, here we are using same standard kernel parameter "clocksource=",
755 * and not introducing any OMAP specific interface.
756 */
757static int __init omap2_override_clocksource(char *str)
758{
759 if (!str)
760 return 0;
761 /*
762 * For OMAP architecture, we only have two options
763 * - sync_32k (default)
764 * - gp_timer (sys_clk based)
765 */
766 if (!strcmp(str, "gp_timer"))
767 use_gptimer_clksrc = true;
768
769 return 0;
770}
771early_param("clocksource", omap2_override_clocksource);
This page took 0.696377 seconds and 5 git commands to generate.