2 * linux/arch/arm/plat-mxc/time.c
4 * Copyright (C) 2000-2001 Deep Blue Solutions
5 * Copyright (C) 2002 Shane Nay (shane@minirl.com)
6 * Copyright (C) 2006-2007 Pavel Pisa (ppisa@pikron.com)
7 * Copyright (C) 2008 Juergen Beisert (kernel@pengutronix.de)
9 * This program is free software; you can redistribute it and/or
10 * modify it under the terms of the GNU General Public License
11 * as published by the Free Software Foundation; either version 2
12 * of the License, or (at your option) any later version.
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, write to the Free Software
20 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
24 #include <linux/interrupt.h>
25 #include <linux/irq.h>
26 #include <linux/clockchips.h>
27 #include <linux/clk.h>
28 #include <linux/delay.h>
29 #include <linux/err.h>
30 #include <linux/sched_clock.h>
31 #include <linux/slab.h>
33 #include <linux/of_address.h>
34 #include <linux/of_irq.h>
35 #include <soc/imx/timer.h>
37 #include <asm/mach/time.h>
40 * There are 4 versions of the timer hardware on Freescale MXC hardware.
43 * - MX25, MX31, MX35, MX37, MX51, MX6Q(rev1.0)
44 * - MX6DL, MX6SX, MX6Q(rev1.1+)
47 /* defines common for all i.MX */
49 #define MXC_TCTL_TEN (1 << 0) /* Enable module */
50 #define MXC_TPRER 0x04
53 #define MX1_2_TCTL_CLK_PCLK1 (1 << 1)
54 #define MX1_2_TCTL_IRQEN (1 << 4)
55 #define MX1_2_TCTL_FRR (1 << 8)
56 #define MX1_2_TCMP 0x08
57 #define MX1_2_TCN 0x10
58 #define MX1_2_TSTAT 0x14
61 #define MX2_TSTAT_CAPT (1 << 1)
62 #define MX2_TSTAT_COMP (1 << 0)
64 /* MX31, MX35, MX25, MX5, MX6 */
65 #define V2_TCTL_WAITEN (1 << 3) /* Wait enable mode */
66 #define V2_TCTL_CLK_IPG (1 << 6)
67 #define V2_TCTL_CLK_PER (2 << 6)
68 #define V2_TCTL_CLK_OSC_DIV8 (5 << 6)
69 #define V2_TCTL_FRR (1 << 9)
70 #define V2_TCTL_24MEN (1 << 10)
71 #define V2_TPRER_PRE24M 12
74 #define V2_TSTAT_OF1 (1 << 0)
78 #define V2_TIMER_RATE_OSC_DIV8 3000000
81 enum imx_gpt_type type;
86 const struct imx_gpt_data *gpt;
87 struct clock_event_device ced;
88 enum clock_event_mode cem;
96 void (*gpt_setup_tctl)(struct imx_timer *imxtm);
97 void (*gpt_irq_enable)(struct imx_timer *imxtm);
98 void (*gpt_irq_disable)(struct imx_timer *imxtm);
99 void (*gpt_irq_acknowledge)(struct imx_timer *imxtm);
100 int (*set_next_event)(unsigned long evt,
101 struct clock_event_device *ced);
104 static inline struct imx_timer *to_imx_timer(struct clock_event_device *ced)
106 return container_of(ced, struct imx_timer, ced);
109 static void imx1_gpt_irq_disable(struct imx_timer *imxtm)
113 tmp = readl_relaxed(imxtm->base + MXC_TCTL);
114 writel_relaxed(tmp & ~MX1_2_TCTL_IRQEN, imxtm->base + MXC_TCTL);
116 #define imx21_gpt_irq_disable imx1_gpt_irq_disable
118 static void imx31_gpt_irq_disable(struct imx_timer *imxtm)
120 writel_relaxed(0, imxtm->base + V2_IR);
122 #define imx6dl_gpt_irq_disable imx31_gpt_irq_disable
124 static void imx1_gpt_irq_enable(struct imx_timer *imxtm)
128 tmp = readl_relaxed(imxtm->base + MXC_TCTL);
129 writel_relaxed(tmp | MX1_2_TCTL_IRQEN, imxtm->base + MXC_TCTL);
131 #define imx21_gpt_irq_enable imx1_gpt_irq_enable
133 static void imx31_gpt_irq_enable(struct imx_timer *imxtm)
135 writel_relaxed(1<<0, imxtm->base + V2_IR);
137 #define imx6dl_gpt_irq_enable imx31_gpt_irq_enable
139 static void imx1_gpt_irq_acknowledge(struct imx_timer *imxtm)
141 writel_relaxed(0, imxtm->base + MX1_2_TSTAT);
144 static void imx21_gpt_irq_acknowledge(struct imx_timer *imxtm)
146 writel_relaxed(MX2_TSTAT_CAPT | MX2_TSTAT_COMP,
147 imxtm->base + MX1_2_TSTAT);
150 static void imx31_gpt_irq_acknowledge(struct imx_timer *imxtm)
152 writel_relaxed(V2_TSTAT_OF1, imxtm->base + V2_TSTAT);
154 #define imx6dl_gpt_irq_acknowledge imx31_gpt_irq_acknowledge
156 static void __iomem *sched_clock_reg;
158 static u64 notrace mxc_read_sched_clock(void)
160 return sched_clock_reg ? readl_relaxed(sched_clock_reg) : 0;
163 static struct delay_timer imx_delay_timer;
165 static unsigned long imx_read_current_timer(void)
167 return readl_relaxed(sched_clock_reg);
170 static int __init mxc_clocksource_init(struct imx_timer *imxtm)
172 unsigned int c = clk_get_rate(imxtm->clk_per);
173 void __iomem *reg = imxtm->base + imxtm->gpt->reg_tcn;
175 imx_delay_timer.read_current_timer = &imx_read_current_timer;
176 imx_delay_timer.freq = c;
177 register_current_timer_delay(&imx_delay_timer);
179 sched_clock_reg = reg;
181 sched_clock_register(mxc_read_sched_clock, 32, c);
182 return clocksource_mmio_init(reg, "mxc_timer1", c, 200, 32,
183 clocksource_mmio_readl_up);
188 static int mx1_2_set_next_event(unsigned long evt,
189 struct clock_event_device *ced)
191 struct imx_timer *imxtm = to_imx_timer(ced);
194 tcmp = readl_relaxed(imxtm->base + MX1_2_TCN) + evt;
196 writel_relaxed(tcmp, imxtm->base + MX1_2_TCMP);
198 return (int)(tcmp - readl_relaxed(imxtm->base + MX1_2_TCN)) < 0 ?
202 static int v2_set_next_event(unsigned long evt,
203 struct clock_event_device *ced)
205 struct imx_timer *imxtm = to_imx_timer(ced);
208 tcmp = readl_relaxed(imxtm->base + V2_TCN) + evt;
210 writel_relaxed(tcmp, imxtm->base + V2_TCMP);
212 return evt < 0x7fffffff &&
213 (int)(tcmp - readl_relaxed(imxtm->base + V2_TCN)) < 0 ?
218 static const char *clock_event_mode_label[] = {
219 [CLOCK_EVT_MODE_PERIODIC] = "CLOCK_EVT_MODE_PERIODIC",
220 [CLOCK_EVT_MODE_ONESHOT] = "CLOCK_EVT_MODE_ONESHOT",
221 [CLOCK_EVT_MODE_SHUTDOWN] = "CLOCK_EVT_MODE_SHUTDOWN",
222 [CLOCK_EVT_MODE_UNUSED] = "CLOCK_EVT_MODE_UNUSED",
223 [CLOCK_EVT_MODE_RESUME] = "CLOCK_EVT_MODE_RESUME",
227 static void mxc_set_mode(enum clock_event_mode mode,
228 struct clock_event_device *ced)
230 struct imx_timer *imxtm = to_imx_timer(ced);
234 * The timer interrupt generation is disabled at least
235 * for enough time to call mxc_set_next_event()
237 local_irq_save(flags);
239 /* Disable interrupt in GPT module */
240 imxtm->gpt->gpt_irq_disable(imxtm);
242 if (mode != imxtm->cem) {
243 u32 tcn = readl_relaxed(imxtm->base + imxtm->gpt->reg_tcn);
244 /* Set event time into far-far future */
245 writel_relaxed(tcn - 3, imxtm->base + imxtm->gpt->reg_tcmp);
247 /* Clear pending interrupt */
248 imxtm->gpt->gpt_irq_acknowledge(imxtm);
252 printk(KERN_INFO "mxc_set_mode: changing mode from %s to %s\n",
253 clock_event_mode_label[imxtm->cem],
254 clock_event_mode_label[mode]);
257 /* Remember timer mode */
259 local_irq_restore(flags);
262 case CLOCK_EVT_MODE_PERIODIC:
263 printk(KERN_ERR"mxc_set_mode: Periodic mode is not "
264 "supported for i.MX\n");
266 case CLOCK_EVT_MODE_ONESHOT:
268 * Do not put overhead of interrupt enable/disable into
269 * mxc_set_next_event(), the core has about 4 minutes
270 * to call mxc_set_next_event() or shutdown clock after
273 local_irq_save(flags);
274 imxtm->gpt->gpt_irq_enable(imxtm);
275 local_irq_restore(flags);
277 case CLOCK_EVT_MODE_SHUTDOWN:
278 case CLOCK_EVT_MODE_UNUSED:
279 case CLOCK_EVT_MODE_RESUME:
280 /* Left event sources disabled, no more interrupts appear */
286 * IRQ handler for the timer
288 static irqreturn_t mxc_timer_interrupt(int irq, void *dev_id)
290 struct clock_event_device *ced = dev_id;
291 struct imx_timer *imxtm = to_imx_timer(ced);
294 tstat = readl_relaxed(imxtm->base + imxtm->gpt->reg_tstat);
296 imxtm->gpt->gpt_irq_acknowledge(imxtm);
298 ced->event_handler(ced);
303 static int __init mxc_clockevent_init(struct imx_timer *imxtm)
305 struct clock_event_device *ced = &imxtm->ced;
306 struct irqaction *act = &imxtm->act;
308 imxtm->cem = CLOCK_EVT_MODE_UNUSED;
310 ced->name = "mxc_timer1";
311 ced->features = CLOCK_EVT_FEAT_ONESHOT;
312 ced->set_mode = mxc_set_mode;
313 ced->set_next_event = imxtm->gpt->set_next_event;
315 ced->cpumask = cpumask_of(0);
316 clockevents_config_and_register(ced, clk_get_rate(imxtm->clk_per),
319 act->name = "i.MX Timer Tick";
320 act->flags = IRQF_TIMER | IRQF_IRQPOLL;
321 act->handler = mxc_timer_interrupt;
324 return setup_irq(imxtm->irq, act);
327 static void imx1_gpt_setup_tctl(struct imx_timer *imxtm)
331 tctl_val = MX1_2_TCTL_FRR | MX1_2_TCTL_CLK_PCLK1 | MXC_TCTL_TEN;
332 writel_relaxed(tctl_val, imxtm->base + MXC_TCTL);
334 #define imx21_gpt_setup_tctl imx1_gpt_setup_tctl
336 static void imx31_gpt_setup_tctl(struct imx_timer *imxtm)
340 tctl_val = V2_TCTL_FRR | V2_TCTL_WAITEN | MXC_TCTL_TEN;
341 if (clk_get_rate(imxtm->clk_per) == V2_TIMER_RATE_OSC_DIV8)
342 tctl_val |= V2_TCTL_CLK_OSC_DIV8;
344 tctl_val |= V2_TCTL_CLK_PER;
346 writel_relaxed(tctl_val, imxtm->base + MXC_TCTL);
349 static void imx6dl_gpt_setup_tctl(struct imx_timer *imxtm)
353 tctl_val = V2_TCTL_FRR | V2_TCTL_WAITEN | MXC_TCTL_TEN;
354 if (clk_get_rate(imxtm->clk_per) == V2_TIMER_RATE_OSC_DIV8) {
355 tctl_val |= V2_TCTL_CLK_OSC_DIV8;
357 writel_relaxed(7 << V2_TPRER_PRE24M, imxtm->base + MXC_TPRER);
358 tctl_val |= V2_TCTL_24MEN;
360 tctl_val |= V2_TCTL_CLK_PER;
363 writel_relaxed(tctl_val, imxtm->base + MXC_TCTL);
366 static const struct imx_gpt_data imx1_gpt_data = {
367 .reg_tstat = MX1_2_TSTAT,
368 .reg_tcn = MX1_2_TCN,
369 .reg_tcmp = MX1_2_TCMP,
370 .gpt_irq_enable = imx1_gpt_irq_enable,
371 .gpt_irq_disable = imx1_gpt_irq_disable,
372 .gpt_irq_acknowledge = imx1_gpt_irq_acknowledge,
373 .gpt_setup_tctl = imx1_gpt_setup_tctl,
374 .set_next_event = mx1_2_set_next_event,
377 static const struct imx_gpt_data imx21_gpt_data = {
378 .reg_tstat = MX1_2_TSTAT,
379 .reg_tcn = MX1_2_TCN,
380 .reg_tcmp = MX1_2_TCMP,
381 .gpt_irq_enable = imx21_gpt_irq_enable,
382 .gpt_irq_disable = imx21_gpt_irq_disable,
383 .gpt_irq_acknowledge = imx21_gpt_irq_acknowledge,
384 .gpt_setup_tctl = imx21_gpt_setup_tctl,
385 .set_next_event = mx1_2_set_next_event,
388 static const struct imx_gpt_data imx31_gpt_data = {
389 .reg_tstat = V2_TSTAT,
392 .gpt_irq_enable = imx31_gpt_irq_enable,
393 .gpt_irq_disable = imx31_gpt_irq_disable,
394 .gpt_irq_acknowledge = imx31_gpt_irq_acknowledge,
395 .gpt_setup_tctl = imx31_gpt_setup_tctl,
396 .set_next_event = v2_set_next_event,
399 static const struct imx_gpt_data imx6dl_gpt_data = {
400 .reg_tstat = V2_TSTAT,
403 .gpt_irq_enable = imx6dl_gpt_irq_enable,
404 .gpt_irq_disable = imx6dl_gpt_irq_disable,
405 .gpt_irq_acknowledge = imx6dl_gpt_irq_acknowledge,
406 .gpt_setup_tctl = imx6dl_gpt_setup_tctl,
407 .set_next_event = v2_set_next_event,
410 static void __init _mxc_timer_init(struct imx_timer *imxtm)
412 switch (imxtm->type) {
414 imxtm->gpt = &imx1_gpt_data;
417 imxtm->gpt = &imx21_gpt_data;
420 imxtm->gpt = &imx31_gpt_data;
422 case GPT_TYPE_IMX6DL:
423 imxtm->gpt = &imx6dl_gpt_data;
429 if (IS_ERR(imxtm->clk_per)) {
430 pr_err("i.MX timer: unable to get clk\n");
434 if (!IS_ERR(imxtm->clk_ipg))
435 clk_prepare_enable(imxtm->clk_ipg);
437 clk_prepare_enable(imxtm->clk_per);
440 * Initialise to a known state (all timers off, and timing reset)
443 writel_relaxed(0, imxtm->base + MXC_TCTL);
444 writel_relaxed(0, imxtm->base + MXC_TPRER); /* see datasheet note */
446 imxtm->gpt->gpt_setup_tctl(imxtm);
448 /* init and register the timer to the framework */
449 mxc_clocksource_init(imxtm);
450 mxc_clockevent_init(imxtm);
453 void __init mxc_timer_init(unsigned long pbase, int irq, enum imx_gpt_type type)
455 struct imx_timer *imxtm;
457 imxtm = kzalloc(sizeof(*imxtm), GFP_KERNEL);
460 imxtm->clk_per = clk_get_sys("imx-gpt.0", "per");
461 imxtm->clk_ipg = clk_get_sys("imx-gpt.0", "ipg");
463 imxtm->base = ioremap(pbase, SZ_4K);
464 BUG_ON(!imxtm->base);
468 _mxc_timer_init(imxtm);
471 static void __init mxc_timer_init_dt(struct device_node *np, enum imx_gpt_type type)
473 struct imx_timer *imxtm;
474 static int initialized;
476 /* Support one instance only */
480 imxtm = kzalloc(sizeof(*imxtm), GFP_KERNEL);
483 imxtm->base = of_iomap(np, 0);
484 WARN_ON(!imxtm->base);
485 imxtm->irq = irq_of_parse_and_map(np, 0);
487 imxtm->clk_ipg = of_clk_get_by_name(np, "ipg");
489 /* Try osc_per first, and fall back to per otherwise */
490 imxtm->clk_per = of_clk_get_by_name(np, "osc_per");
491 if (IS_ERR(imxtm->clk_per))
492 imxtm->clk_per = of_clk_get_by_name(np, "per");
496 _mxc_timer_init(imxtm);
501 static void __init imx1_timer_init_dt(struct device_node *np)
503 mxc_timer_init_dt(np, GPT_TYPE_IMX1);
506 static void __init imx21_timer_init_dt(struct device_node *np)
508 mxc_timer_init_dt(np, GPT_TYPE_IMX21);
511 static void __init imx31_timer_init_dt(struct device_node *np)
513 enum imx_gpt_type type = GPT_TYPE_IMX31;
516 * We were using the same compatible string for i.MX6Q/D and i.MX6DL/S
517 * GPT device, while they actually have different programming model.
518 * This is a workaround to keep the existing i.MX6DL/S DTBs continue
519 * working with the new kernel.
521 if (of_machine_is_compatible("fsl,imx6dl"))
522 type = GPT_TYPE_IMX6DL;
524 mxc_timer_init_dt(np, type);
527 static void __init imx6dl_timer_init_dt(struct device_node *np)
529 mxc_timer_init_dt(np, GPT_TYPE_IMX6DL);
532 CLOCKSOURCE_OF_DECLARE(imx1_timer, "fsl,imx1-gpt", imx1_timer_init_dt);
533 CLOCKSOURCE_OF_DECLARE(imx21_timer, "fsl,imx21-gpt", imx21_timer_init_dt);
534 CLOCKSOURCE_OF_DECLARE(imx31_timer, "fsl,imx31-gpt", imx31_timer_init_dt);
535 CLOCKSOURCE_OF_DECLARE(imx25_timer, "fsl,imx25-gpt", imx31_timer_init_dt);
536 CLOCKSOURCE_OF_DECLARE(imx50_timer, "fsl,imx50-gpt", imx31_timer_init_dt);
537 CLOCKSOURCE_OF_DECLARE(imx51_timer, "fsl,imx51-gpt", imx31_timer_init_dt);
538 CLOCKSOURCE_OF_DECLARE(imx53_timer, "fsl,imx53-gpt", imx31_timer_init_dt);
539 CLOCKSOURCE_OF_DECLARE(imx6q_timer, "fsl,imx6q-gpt", imx31_timer_init_dt);
540 CLOCKSOURCE_OF_DECLARE(imx6dl_timer, "fsl,imx6dl-gpt", imx6dl_timer_init_dt);
541 CLOCKSOURCE_OF_DECLARE(imx6sl_timer, "fsl,imx6sl-gpt", imx6dl_timer_init_dt);
542 CLOCKSOURCE_OF_DECLARE(imx6sx_timer, "fsl,imx6sx-gpt", imx6dl_timer_init_dt);