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1// SPDX-License-Identifier: GPL-2.0+
2//
3// Copyright (C) 2000-2001 Deep Blue Solutions
4// Copyright (C) 2002 Shane Nay (shane@minirl.com)
5// Copyright (C) 2006-2007 Pavel Pisa (ppisa@pikron.com)
6// Copyright (C) 2008 Juergen Beisert (kernel@pengutronix.de)
7
8#include <linux/interrupt.h>
9#include <linux/irq.h>
10#include <linux/clockchips.h>
11#include <linux/clk.h>
12#include <linux/delay.h>
13#include <linux/err.h>
14#include <linux/sched_clock.h>
15#include <linux/slab.h>
16#include <linux/of.h>
17#include <linux/of_address.h>
18#include <linux/of_irq.h>
19#include <soc/imx/timer.h>
20
21/*
22 * There are 4 versions of the timer hardware on Freescale MXC hardware.
23 * - MX1/MXL
24 * - MX21, MX27.
25 * - MX25, MX31, MX35, MX37, MX51, MX6Q(rev1.0)
26 * - MX6DL, MX6SX, MX6Q(rev1.1+)
27 */
28
29/* defines common for all i.MX */
30#define MXC_TCTL 0x00
31#define MXC_TCTL_TEN (1 << 0) /* Enable module */
32#define MXC_TPRER 0x04
33
34/* MX1, MX21, MX27 */
35#define MX1_2_TCTL_CLK_PCLK1 (1 << 1)
36#define MX1_2_TCTL_IRQEN (1 << 4)
37#define MX1_2_TCTL_FRR (1 << 8)
38#define MX1_2_TCMP 0x08
39#define MX1_2_TCN 0x10
40#define MX1_2_TSTAT 0x14
41
42/* MX21, MX27 */
43#define MX2_TSTAT_CAPT (1 << 1)
44#define MX2_TSTAT_COMP (1 << 0)
45
46/* MX31, MX35, MX25, MX5, MX6 */
47#define V2_TCTL_WAITEN (1 << 3) /* Wait enable mode */
48#define V2_TCTL_CLK_IPG (1 << 6)
49#define V2_TCTL_CLK_PER (2 << 6)
50#define V2_TCTL_CLK_OSC_DIV8 (5 << 6)
51#define V2_TCTL_FRR (1 << 9)
52#define V2_TCTL_24MEN (1 << 10)
53#define V2_TPRER_PRE24M 12
54#define V2_IR 0x0c
55#define V2_TSTAT 0x08
56#define V2_TSTAT_OF1 (1 << 0)
57#define V2_TCN 0x24
58#define V2_TCMP 0x10
59
60#define V2_TIMER_RATE_OSC_DIV8 3000000
61
62struct imx_timer {
63 enum imx_gpt_type type;
64 void __iomem *base;
65 int irq;
66 struct clk *clk_per;
67 struct clk *clk_ipg;
68 const struct imx_gpt_data *gpt;
69 struct clock_event_device ced;
70};
71
72struct imx_gpt_data {
73 int reg_tstat;
74 int reg_tcn;
75 int reg_tcmp;
76 void (*gpt_setup_tctl)(struct imx_timer *imxtm);
77 void (*gpt_irq_enable)(struct imx_timer *imxtm);
78 void (*gpt_irq_disable)(struct imx_timer *imxtm);
79 void (*gpt_irq_acknowledge)(struct imx_timer *imxtm);
80 int (*set_next_event)(unsigned long evt,
81 struct clock_event_device *ced);
82};
83
84static inline struct imx_timer *to_imx_timer(struct clock_event_device *ced)
85{
86 return container_of(ced, struct imx_timer, ced);
87}
88
89static void imx1_gpt_irq_disable(struct imx_timer *imxtm)
90{
91 unsigned int tmp;
92
93 tmp = readl_relaxed(imxtm->base + MXC_TCTL);
94 writel_relaxed(tmp & ~MX1_2_TCTL_IRQEN, imxtm->base + MXC_TCTL);
95}
96#define imx21_gpt_irq_disable imx1_gpt_irq_disable
97
98static void imx31_gpt_irq_disable(struct imx_timer *imxtm)
99{
100 writel_relaxed(0, imxtm->base + V2_IR);
101}
102#define imx6dl_gpt_irq_disable imx31_gpt_irq_disable
103
104static void imx1_gpt_irq_enable(struct imx_timer *imxtm)
105{
106 unsigned int tmp;
107
108 tmp = readl_relaxed(imxtm->base + MXC_TCTL);
109 writel_relaxed(tmp | MX1_2_TCTL_IRQEN, imxtm->base + MXC_TCTL);
110}
111#define imx21_gpt_irq_enable imx1_gpt_irq_enable
112
113static void imx31_gpt_irq_enable(struct imx_timer *imxtm)
114{
115 writel_relaxed(1<<0, imxtm->base + V2_IR);
116}
117#define imx6dl_gpt_irq_enable imx31_gpt_irq_enable
118
119static void imx1_gpt_irq_acknowledge(struct imx_timer *imxtm)
120{
121 writel_relaxed(0, imxtm->base + MX1_2_TSTAT);
122}
123
124static void imx21_gpt_irq_acknowledge(struct imx_timer *imxtm)
125{
126 writel_relaxed(MX2_TSTAT_CAPT | MX2_TSTAT_COMP,
127 imxtm->base + MX1_2_TSTAT);
128}
129
130static void imx31_gpt_irq_acknowledge(struct imx_timer *imxtm)
131{
132 writel_relaxed(V2_TSTAT_OF1, imxtm->base + V2_TSTAT);
133}
134#define imx6dl_gpt_irq_acknowledge imx31_gpt_irq_acknowledge
135
136static void __iomem *sched_clock_reg;
137
138static u64 notrace mxc_read_sched_clock(void)
139{
140 return sched_clock_reg ? readl_relaxed(sched_clock_reg) : 0;
141}
142
143#if defined(CONFIG_ARM)
144static struct delay_timer imx_delay_timer;
145
146static unsigned long imx_read_current_timer(void)
147{
148 return readl_relaxed(sched_clock_reg);
149}
150#endif
151
152static int __init mxc_clocksource_init(struct imx_timer *imxtm)
153{
154 unsigned int c = clk_get_rate(imxtm->clk_per);
155 void __iomem *reg = imxtm->base + imxtm->gpt->reg_tcn;
156
157#if defined(CONFIG_ARM)
158 imx_delay_timer.read_current_timer = &imx_read_current_timer;
159 imx_delay_timer.freq = c;
160 register_current_timer_delay(&imx_delay_timer);
161#endif
162
163 sched_clock_reg = reg;
164
165 sched_clock_register(mxc_read_sched_clock, 32, c);
166 return clocksource_mmio_init(reg, "mxc_timer1", c, 200, 32,
167 clocksource_mmio_readl_up);
168}
169
170/* clock event */
171
172static int mx1_2_set_next_event(unsigned long evt,
173 struct clock_event_device *ced)
174{
175 struct imx_timer *imxtm = to_imx_timer(ced);
176 unsigned long tcmp;
177
178 tcmp = readl_relaxed(imxtm->base + MX1_2_TCN) + evt;
179
180 writel_relaxed(tcmp, imxtm->base + MX1_2_TCMP);
181
182 return (int)(tcmp - readl_relaxed(imxtm->base + MX1_2_TCN)) < 0 ?
183 -ETIME : 0;
184}
185
186static int v2_set_next_event(unsigned long evt,
187 struct clock_event_device *ced)
188{
189 struct imx_timer *imxtm = to_imx_timer(ced);
190 unsigned long tcmp;
191
192 tcmp = readl_relaxed(imxtm->base + V2_TCN) + evt;
193
194 writel_relaxed(tcmp, imxtm->base + V2_TCMP);
195
196 return evt < 0x7fffffff &&
197 (int)(tcmp - readl_relaxed(imxtm->base + V2_TCN)) < 0 ?
198 -ETIME : 0;
199}
200
201static int mxc_shutdown(struct clock_event_device *ced)
202{
203 struct imx_timer *imxtm = to_imx_timer(ced);
204 u32 tcn;
205
206 /* Disable interrupt in GPT module */
207 imxtm->gpt->gpt_irq_disable(imxtm);
208
209 tcn = readl_relaxed(imxtm->base + imxtm->gpt->reg_tcn);
210 /* Set event time into far-far future */
211 writel_relaxed(tcn - 3, imxtm->base + imxtm->gpt->reg_tcmp);
212
213 /* Clear pending interrupt */
214 imxtm->gpt->gpt_irq_acknowledge(imxtm);
215
216#ifdef DEBUG
217 printk(KERN_INFO "%s: changing mode\n", __func__);
218#endif /* DEBUG */
219
220 return 0;
221}
222
223static int mxc_set_oneshot(struct clock_event_device *ced)
224{
225 struct imx_timer *imxtm = to_imx_timer(ced);
226
227 /* Disable interrupt in GPT module */
228 imxtm->gpt->gpt_irq_disable(imxtm);
229
230 if (!clockevent_state_oneshot(ced)) {
231 u32 tcn = readl_relaxed(imxtm->base + imxtm->gpt->reg_tcn);
232 /* Set event time into far-far future */
233 writel_relaxed(tcn - 3, imxtm->base + imxtm->gpt->reg_tcmp);
234
235 /* Clear pending interrupt */
236 imxtm->gpt->gpt_irq_acknowledge(imxtm);
237 }
238
239#ifdef DEBUG
240 printk(KERN_INFO "%s: changing mode\n", __func__);
241#endif /* DEBUG */
242
243 /*
244 * Do not put overhead of interrupt enable/disable into
245 * mxc_set_next_event(), the core has about 4 minutes
246 * to call mxc_set_next_event() or shutdown clock after
247 * mode switching
248 */
249 imxtm->gpt->gpt_irq_enable(imxtm);
250
251 return 0;
252}
253
254/*
255 * IRQ handler for the timer
256 */
257static irqreturn_t mxc_timer_interrupt(int irq, void *dev_id)
258{
259 struct clock_event_device *ced = dev_id;
260 struct imx_timer *imxtm = to_imx_timer(ced);
261 uint32_t tstat;
262
263 tstat = readl_relaxed(imxtm->base + imxtm->gpt->reg_tstat);
264
265 imxtm->gpt->gpt_irq_acknowledge(imxtm);
266
267 ced->event_handler(ced);
268
269 return IRQ_HANDLED;
270}
271
272static int __init mxc_clockevent_init(struct imx_timer *imxtm)
273{
274 struct clock_event_device *ced = &imxtm->ced;
275
276 ced->name = "mxc_timer1";
277 ced->features = CLOCK_EVT_FEAT_ONESHOT | CLOCK_EVT_FEAT_DYNIRQ;
278 ced->set_state_shutdown = mxc_shutdown;
279 ced->set_state_oneshot = mxc_set_oneshot;
280 ced->tick_resume = mxc_shutdown;
281 ced->set_next_event = imxtm->gpt->set_next_event;
282 ced->rating = 200;
283 ced->cpumask = cpumask_of(0);
284 ced->irq = imxtm->irq;
285 clockevents_config_and_register(ced, clk_get_rate(imxtm->clk_per),
286 0xff, 0xfffffffe);
287
288 return request_irq(imxtm->irq, mxc_timer_interrupt,
289 IRQF_TIMER | IRQF_IRQPOLL, "i.MX Timer Tick", ced);
290}
291
292static void imx1_gpt_setup_tctl(struct imx_timer *imxtm)
293{
294 u32 tctl_val;
295
296 tctl_val = MX1_2_TCTL_FRR | MX1_2_TCTL_CLK_PCLK1 | MXC_TCTL_TEN;
297 writel_relaxed(tctl_val, imxtm->base + MXC_TCTL);
298}
299#define imx21_gpt_setup_tctl imx1_gpt_setup_tctl
300
301static void imx31_gpt_setup_tctl(struct imx_timer *imxtm)
302{
303 u32 tctl_val;
304
305 tctl_val = V2_TCTL_FRR | V2_TCTL_WAITEN | MXC_TCTL_TEN;
306 if (clk_get_rate(imxtm->clk_per) == V2_TIMER_RATE_OSC_DIV8)
307 tctl_val |= V2_TCTL_CLK_OSC_DIV8;
308 else
309 tctl_val |= V2_TCTL_CLK_PER;
310
311 writel_relaxed(tctl_val, imxtm->base + MXC_TCTL);
312}
313
314static void imx6dl_gpt_setup_tctl(struct imx_timer *imxtm)
315{
316 u32 tctl_val;
317
318 tctl_val = V2_TCTL_FRR | V2_TCTL_WAITEN | MXC_TCTL_TEN;
319 if (clk_get_rate(imxtm->clk_per) == V2_TIMER_RATE_OSC_DIV8) {
320 tctl_val |= V2_TCTL_CLK_OSC_DIV8;
321 /* 24 / 8 = 3 MHz */
322 writel_relaxed(7 << V2_TPRER_PRE24M, imxtm->base + MXC_TPRER);
323 tctl_val |= V2_TCTL_24MEN;
324 } else {
325 tctl_val |= V2_TCTL_CLK_PER;
326 }
327
328 writel_relaxed(tctl_val, imxtm->base + MXC_TCTL);
329}
330
331static const struct imx_gpt_data imx1_gpt_data = {
332 .reg_tstat = MX1_2_TSTAT,
333 .reg_tcn = MX1_2_TCN,
334 .reg_tcmp = MX1_2_TCMP,
335 .gpt_irq_enable = imx1_gpt_irq_enable,
336 .gpt_irq_disable = imx1_gpt_irq_disable,
337 .gpt_irq_acknowledge = imx1_gpt_irq_acknowledge,
338 .gpt_setup_tctl = imx1_gpt_setup_tctl,
339 .set_next_event = mx1_2_set_next_event,
340};
341
342static const struct imx_gpt_data imx21_gpt_data = {
343 .reg_tstat = MX1_2_TSTAT,
344 .reg_tcn = MX1_2_TCN,
345 .reg_tcmp = MX1_2_TCMP,
346 .gpt_irq_enable = imx21_gpt_irq_enable,
347 .gpt_irq_disable = imx21_gpt_irq_disable,
348 .gpt_irq_acknowledge = imx21_gpt_irq_acknowledge,
349 .gpt_setup_tctl = imx21_gpt_setup_tctl,
350 .set_next_event = mx1_2_set_next_event,
351};
352
353static const struct imx_gpt_data imx31_gpt_data = {
354 .reg_tstat = V2_TSTAT,
355 .reg_tcn = V2_TCN,
356 .reg_tcmp = V2_TCMP,
357 .gpt_irq_enable = imx31_gpt_irq_enable,
358 .gpt_irq_disable = imx31_gpt_irq_disable,
359 .gpt_irq_acknowledge = imx31_gpt_irq_acknowledge,
360 .gpt_setup_tctl = imx31_gpt_setup_tctl,
361 .set_next_event = v2_set_next_event,
362};
363
364static const struct imx_gpt_data imx6dl_gpt_data = {
365 .reg_tstat = V2_TSTAT,
366 .reg_tcn = V2_TCN,
367 .reg_tcmp = V2_TCMP,
368 .gpt_irq_enable = imx6dl_gpt_irq_enable,
369 .gpt_irq_disable = imx6dl_gpt_irq_disable,
370 .gpt_irq_acknowledge = imx6dl_gpt_irq_acknowledge,
371 .gpt_setup_tctl = imx6dl_gpt_setup_tctl,
372 .set_next_event = v2_set_next_event,
373};
374
375static int __init _mxc_timer_init(struct imx_timer *imxtm)
376{
377 int ret;
378
379 switch (imxtm->type) {
380 case GPT_TYPE_IMX1:
381 imxtm->gpt = &imx1_gpt_data;
382 break;
383 case GPT_TYPE_IMX21:
384 imxtm->gpt = &imx21_gpt_data;
385 break;
386 case GPT_TYPE_IMX31:
387 imxtm->gpt = &imx31_gpt_data;
388 break;
389 case GPT_TYPE_IMX6DL:
390 imxtm->gpt = &imx6dl_gpt_data;
391 break;
392 default:
393 return -EINVAL;
394 }
395
396 if (IS_ERR(imxtm->clk_per)) {
397 pr_err("i.MX timer: unable to get clk\n");
398 return PTR_ERR(imxtm->clk_per);
399 }
400
401 if (!IS_ERR(imxtm->clk_ipg))
402 clk_prepare_enable(imxtm->clk_ipg);
403
404 clk_prepare_enable(imxtm->clk_per);
405
406 /*
407 * Initialise to a known state (all timers off, and timing reset)
408 */
409
410 writel_relaxed(0, imxtm->base + MXC_TCTL);
411 writel_relaxed(0, imxtm->base + MXC_TPRER); /* see datasheet note */
412
413 imxtm->gpt->gpt_setup_tctl(imxtm);
414
415 /* init and register the timer to the framework */
416 ret = mxc_clocksource_init(imxtm);
417 if (ret)
418 return ret;
419
420 return mxc_clockevent_init(imxtm);
421}
422
423void __init mxc_timer_init(unsigned long pbase, int irq, enum imx_gpt_type type)
424{
425 struct imx_timer *imxtm;
426
427 imxtm = kzalloc(sizeof(*imxtm), GFP_KERNEL);
428 BUG_ON(!imxtm);
429
430 imxtm->clk_per = clk_get_sys("imx-gpt.0", "per");
431 imxtm->clk_ipg = clk_get_sys("imx-gpt.0", "ipg");
432
433 imxtm->base = ioremap(pbase, SZ_4K);
434 BUG_ON(!imxtm->base);
435
436 imxtm->type = type;
437 imxtm->irq = irq;
438
439 _mxc_timer_init(imxtm);
440}
441
442static int __init mxc_timer_init_dt(struct device_node *np, enum imx_gpt_type type)
443{
444 struct imx_timer *imxtm;
445 static int initialized;
446 int ret;
447
448 /* Support one instance only */
449 if (initialized)
450 return 0;
451
452 imxtm = kzalloc(sizeof(*imxtm), GFP_KERNEL);
453 if (!imxtm)
454 return -ENOMEM;
455
456 imxtm->base = of_iomap(np, 0);
457 if (!imxtm->base)
458 return -ENXIO;
459
460 imxtm->irq = irq_of_parse_and_map(np, 0);
461 if (imxtm->irq <= 0)
462 return -EINVAL;
463
464 imxtm->clk_ipg = of_clk_get_by_name(np, "ipg");
465
466 /* Try osc_per first, and fall back to per otherwise */
467 imxtm->clk_per = of_clk_get_by_name(np, "osc_per");
468 if (IS_ERR(imxtm->clk_per))
469 imxtm->clk_per = of_clk_get_by_name(np, "per");
470
471 imxtm->type = type;
472
473 ret = _mxc_timer_init(imxtm);
474 if (ret)
475 return ret;
476
477 initialized = 1;
478
479 return 0;
480}
481
482static int __init imx1_timer_init_dt(struct device_node *np)
483{
484 return mxc_timer_init_dt(np, GPT_TYPE_IMX1);
485}
486
487static int __init imx21_timer_init_dt(struct device_node *np)
488{
489 return mxc_timer_init_dt(np, GPT_TYPE_IMX21);
490}
491
492static int __init imx31_timer_init_dt(struct device_node *np)
493{
494 enum imx_gpt_type type = GPT_TYPE_IMX31;
495
496 /*
497 * We were using the same compatible string for i.MX6Q/D and i.MX6DL/S
498 * GPT device, while they actually have different programming model.
499 * This is a workaround to keep the existing i.MX6DL/S DTBs continue
500 * working with the new kernel.
501 */
502 if (of_machine_is_compatible("fsl,imx6dl"))
503 type = GPT_TYPE_IMX6DL;
504
505 return mxc_timer_init_dt(np, type);
506}
507
508static int __init imx6dl_timer_init_dt(struct device_node *np)
509{
510 return mxc_timer_init_dt(np, GPT_TYPE_IMX6DL);
511}
512
513TIMER_OF_DECLARE(imx1_timer, "fsl,imx1-gpt", imx1_timer_init_dt);
514TIMER_OF_DECLARE(imx21_timer, "fsl,imx21-gpt", imx21_timer_init_dt);
515TIMER_OF_DECLARE(imx27_timer, "fsl,imx27-gpt", imx21_timer_init_dt);
516TIMER_OF_DECLARE(imx31_timer, "fsl,imx31-gpt", imx31_timer_init_dt);
517TIMER_OF_DECLARE(imx25_timer, "fsl,imx25-gpt", imx31_timer_init_dt);
518TIMER_OF_DECLARE(imx50_timer, "fsl,imx50-gpt", imx31_timer_init_dt);
519TIMER_OF_DECLARE(imx51_timer, "fsl,imx51-gpt", imx31_timer_init_dt);
520TIMER_OF_DECLARE(imx53_timer, "fsl,imx53-gpt", imx31_timer_init_dt);
521TIMER_OF_DECLARE(imx6q_timer, "fsl,imx6q-gpt", imx31_timer_init_dt);
522TIMER_OF_DECLARE(imx6dl_timer, "fsl,imx6dl-gpt", imx6dl_timer_init_dt);
523TIMER_OF_DECLARE(imx6sl_timer, "fsl,imx6sl-gpt", imx6dl_timer_init_dt);
524TIMER_OF_DECLARE(imx6sx_timer, "fsl,imx6sx-gpt", imx6dl_timer_init_dt);
1/*
2 * linux/arch/arm/plat-mxc/time.c
3 *
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)
8 *
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.
17 *
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,
21 * MA 02110-1301, USA.
22 */
23
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>
32#include <linux/of.h>
33#include <linux/of_address.h>
34#include <linux/of_irq.h>
35#include <soc/imx/timer.h>
36
37/*
38 * There are 4 versions of the timer hardware on Freescale MXC hardware.
39 * - MX1/MXL
40 * - MX21, MX27.
41 * - MX25, MX31, MX35, MX37, MX51, MX6Q(rev1.0)
42 * - MX6DL, MX6SX, MX6Q(rev1.1+)
43 */
44
45/* defines common for all i.MX */
46#define MXC_TCTL 0x00
47#define MXC_TCTL_TEN (1 << 0) /* Enable module */
48#define MXC_TPRER 0x04
49
50/* MX1, MX21, MX27 */
51#define MX1_2_TCTL_CLK_PCLK1 (1 << 1)
52#define MX1_2_TCTL_IRQEN (1 << 4)
53#define MX1_2_TCTL_FRR (1 << 8)
54#define MX1_2_TCMP 0x08
55#define MX1_2_TCN 0x10
56#define MX1_2_TSTAT 0x14
57
58/* MX21, MX27 */
59#define MX2_TSTAT_CAPT (1 << 1)
60#define MX2_TSTAT_COMP (1 << 0)
61
62/* MX31, MX35, MX25, MX5, MX6 */
63#define V2_TCTL_WAITEN (1 << 3) /* Wait enable mode */
64#define V2_TCTL_CLK_IPG (1 << 6)
65#define V2_TCTL_CLK_PER (2 << 6)
66#define V2_TCTL_CLK_OSC_DIV8 (5 << 6)
67#define V2_TCTL_FRR (1 << 9)
68#define V2_TCTL_24MEN (1 << 10)
69#define V2_TPRER_PRE24M 12
70#define V2_IR 0x0c
71#define V2_TSTAT 0x08
72#define V2_TSTAT_OF1 (1 << 0)
73#define V2_TCN 0x24
74#define V2_TCMP 0x10
75
76#define V2_TIMER_RATE_OSC_DIV8 3000000
77
78struct imx_timer {
79 enum imx_gpt_type type;
80 void __iomem *base;
81 int irq;
82 struct clk *clk_per;
83 struct clk *clk_ipg;
84 const struct imx_gpt_data *gpt;
85 struct clock_event_device ced;
86 struct irqaction act;
87};
88
89struct imx_gpt_data {
90 int reg_tstat;
91 int reg_tcn;
92 int reg_tcmp;
93 void (*gpt_setup_tctl)(struct imx_timer *imxtm);
94 void (*gpt_irq_enable)(struct imx_timer *imxtm);
95 void (*gpt_irq_disable)(struct imx_timer *imxtm);
96 void (*gpt_irq_acknowledge)(struct imx_timer *imxtm);
97 int (*set_next_event)(unsigned long evt,
98 struct clock_event_device *ced);
99};
100
101static inline struct imx_timer *to_imx_timer(struct clock_event_device *ced)
102{
103 return container_of(ced, struct imx_timer, ced);
104}
105
106static void imx1_gpt_irq_disable(struct imx_timer *imxtm)
107{
108 unsigned int tmp;
109
110 tmp = readl_relaxed(imxtm->base + MXC_TCTL);
111 writel_relaxed(tmp & ~MX1_2_TCTL_IRQEN, imxtm->base + MXC_TCTL);
112}
113#define imx21_gpt_irq_disable imx1_gpt_irq_disable
114
115static void imx31_gpt_irq_disable(struct imx_timer *imxtm)
116{
117 writel_relaxed(0, imxtm->base + V2_IR);
118}
119#define imx6dl_gpt_irq_disable imx31_gpt_irq_disable
120
121static void imx1_gpt_irq_enable(struct imx_timer *imxtm)
122{
123 unsigned int tmp;
124
125 tmp = readl_relaxed(imxtm->base + MXC_TCTL);
126 writel_relaxed(tmp | MX1_2_TCTL_IRQEN, imxtm->base + MXC_TCTL);
127}
128#define imx21_gpt_irq_enable imx1_gpt_irq_enable
129
130static void imx31_gpt_irq_enable(struct imx_timer *imxtm)
131{
132 writel_relaxed(1<<0, imxtm->base + V2_IR);
133}
134#define imx6dl_gpt_irq_enable imx31_gpt_irq_enable
135
136static void imx1_gpt_irq_acknowledge(struct imx_timer *imxtm)
137{
138 writel_relaxed(0, imxtm->base + MX1_2_TSTAT);
139}
140
141static void imx21_gpt_irq_acknowledge(struct imx_timer *imxtm)
142{
143 writel_relaxed(MX2_TSTAT_CAPT | MX2_TSTAT_COMP,
144 imxtm->base + MX1_2_TSTAT);
145}
146
147static void imx31_gpt_irq_acknowledge(struct imx_timer *imxtm)
148{
149 writel_relaxed(V2_TSTAT_OF1, imxtm->base + V2_TSTAT);
150}
151#define imx6dl_gpt_irq_acknowledge imx31_gpt_irq_acknowledge
152
153static void __iomem *sched_clock_reg;
154
155static u64 notrace mxc_read_sched_clock(void)
156{
157 return sched_clock_reg ? readl_relaxed(sched_clock_reg) : 0;
158}
159
160static struct delay_timer imx_delay_timer;
161
162static unsigned long imx_read_current_timer(void)
163{
164 return readl_relaxed(sched_clock_reg);
165}
166
167static int __init mxc_clocksource_init(struct imx_timer *imxtm)
168{
169 unsigned int c = clk_get_rate(imxtm->clk_per);
170 void __iomem *reg = imxtm->base + imxtm->gpt->reg_tcn;
171
172 imx_delay_timer.read_current_timer = &imx_read_current_timer;
173 imx_delay_timer.freq = c;
174 register_current_timer_delay(&imx_delay_timer);
175
176 sched_clock_reg = reg;
177
178 sched_clock_register(mxc_read_sched_clock, 32, c);
179 return clocksource_mmio_init(reg, "mxc_timer1", c, 200, 32,
180 clocksource_mmio_readl_up);
181}
182
183/* clock event */
184
185static int mx1_2_set_next_event(unsigned long evt,
186 struct clock_event_device *ced)
187{
188 struct imx_timer *imxtm = to_imx_timer(ced);
189 unsigned long tcmp;
190
191 tcmp = readl_relaxed(imxtm->base + MX1_2_TCN) + evt;
192
193 writel_relaxed(tcmp, imxtm->base + MX1_2_TCMP);
194
195 return (int)(tcmp - readl_relaxed(imxtm->base + MX1_2_TCN)) < 0 ?
196 -ETIME : 0;
197}
198
199static int v2_set_next_event(unsigned long evt,
200 struct clock_event_device *ced)
201{
202 struct imx_timer *imxtm = to_imx_timer(ced);
203 unsigned long tcmp;
204
205 tcmp = readl_relaxed(imxtm->base + V2_TCN) + evt;
206
207 writel_relaxed(tcmp, imxtm->base + V2_TCMP);
208
209 return evt < 0x7fffffff &&
210 (int)(tcmp - readl_relaxed(imxtm->base + V2_TCN)) < 0 ?
211 -ETIME : 0;
212}
213
214static int mxc_shutdown(struct clock_event_device *ced)
215{
216 struct imx_timer *imxtm = to_imx_timer(ced);
217 unsigned long flags;
218 u32 tcn;
219
220 /*
221 * The timer interrupt generation is disabled at least
222 * for enough time to call mxc_set_next_event()
223 */
224 local_irq_save(flags);
225
226 /* Disable interrupt in GPT module */
227 imxtm->gpt->gpt_irq_disable(imxtm);
228
229 tcn = readl_relaxed(imxtm->base + imxtm->gpt->reg_tcn);
230 /* Set event time into far-far future */
231 writel_relaxed(tcn - 3, imxtm->base + imxtm->gpt->reg_tcmp);
232
233 /* Clear pending interrupt */
234 imxtm->gpt->gpt_irq_acknowledge(imxtm);
235
236#ifdef DEBUG
237 printk(KERN_INFO "%s: changing mode\n", __func__);
238#endif /* DEBUG */
239
240 local_irq_restore(flags);
241
242 return 0;
243}
244
245static int mxc_set_oneshot(struct clock_event_device *ced)
246{
247 struct imx_timer *imxtm = to_imx_timer(ced);
248 unsigned long flags;
249
250 /*
251 * The timer interrupt generation is disabled at least
252 * for enough time to call mxc_set_next_event()
253 */
254 local_irq_save(flags);
255
256 /* Disable interrupt in GPT module */
257 imxtm->gpt->gpt_irq_disable(imxtm);
258
259 if (!clockevent_state_oneshot(ced)) {
260 u32 tcn = readl_relaxed(imxtm->base + imxtm->gpt->reg_tcn);
261 /* Set event time into far-far future */
262 writel_relaxed(tcn - 3, imxtm->base + imxtm->gpt->reg_tcmp);
263
264 /* Clear pending interrupt */
265 imxtm->gpt->gpt_irq_acknowledge(imxtm);
266 }
267
268#ifdef DEBUG
269 printk(KERN_INFO "%s: changing mode\n", __func__);
270#endif /* DEBUG */
271
272 /*
273 * Do not put overhead of interrupt enable/disable into
274 * mxc_set_next_event(), the core has about 4 minutes
275 * to call mxc_set_next_event() or shutdown clock after
276 * mode switching
277 */
278 imxtm->gpt->gpt_irq_enable(imxtm);
279 local_irq_restore(flags);
280
281 return 0;
282}
283
284/*
285 * IRQ handler for the timer
286 */
287static irqreturn_t mxc_timer_interrupt(int irq, void *dev_id)
288{
289 struct clock_event_device *ced = dev_id;
290 struct imx_timer *imxtm = to_imx_timer(ced);
291 uint32_t tstat;
292
293 tstat = readl_relaxed(imxtm->base + imxtm->gpt->reg_tstat);
294
295 imxtm->gpt->gpt_irq_acknowledge(imxtm);
296
297 ced->event_handler(ced);
298
299 return IRQ_HANDLED;
300}
301
302static int __init mxc_clockevent_init(struct imx_timer *imxtm)
303{
304 struct clock_event_device *ced = &imxtm->ced;
305 struct irqaction *act = &imxtm->act;
306
307 ced->name = "mxc_timer1";
308 ced->features = CLOCK_EVT_FEAT_ONESHOT | CLOCK_EVT_FEAT_DYNIRQ;
309 ced->set_state_shutdown = mxc_shutdown;
310 ced->set_state_oneshot = mxc_set_oneshot;
311 ced->tick_resume = mxc_shutdown;
312 ced->set_next_event = imxtm->gpt->set_next_event;
313 ced->rating = 200;
314 ced->cpumask = cpumask_of(0);
315 ced->irq = imxtm->irq;
316 clockevents_config_and_register(ced, clk_get_rate(imxtm->clk_per),
317 0xff, 0xfffffffe);
318
319 act->name = "i.MX Timer Tick";
320 act->flags = IRQF_TIMER | IRQF_IRQPOLL;
321 act->handler = mxc_timer_interrupt;
322 act->dev_id = ced;
323
324 return setup_irq(imxtm->irq, act);
325}
326
327static void imx1_gpt_setup_tctl(struct imx_timer *imxtm)
328{
329 u32 tctl_val;
330
331 tctl_val = MX1_2_TCTL_FRR | MX1_2_TCTL_CLK_PCLK1 | MXC_TCTL_TEN;
332 writel_relaxed(tctl_val, imxtm->base + MXC_TCTL);
333}
334#define imx21_gpt_setup_tctl imx1_gpt_setup_tctl
335
336static void imx31_gpt_setup_tctl(struct imx_timer *imxtm)
337{
338 u32 tctl_val;
339
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;
343 else
344 tctl_val |= V2_TCTL_CLK_PER;
345
346 writel_relaxed(tctl_val, imxtm->base + MXC_TCTL);
347}
348
349static void imx6dl_gpt_setup_tctl(struct imx_timer *imxtm)
350{
351 u32 tctl_val;
352
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;
356 /* 24 / 8 = 3 MHz */
357 writel_relaxed(7 << V2_TPRER_PRE24M, imxtm->base + MXC_TPRER);
358 tctl_val |= V2_TCTL_24MEN;
359 } else {
360 tctl_val |= V2_TCTL_CLK_PER;
361 }
362
363 writel_relaxed(tctl_val, imxtm->base + MXC_TCTL);
364}
365
366static 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,
375};
376
377static 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,
386};
387
388static const struct imx_gpt_data imx31_gpt_data = {
389 .reg_tstat = V2_TSTAT,
390 .reg_tcn = V2_TCN,
391 .reg_tcmp = V2_TCMP,
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,
397};
398
399static const struct imx_gpt_data imx6dl_gpt_data = {
400 .reg_tstat = V2_TSTAT,
401 .reg_tcn = V2_TCN,
402 .reg_tcmp = V2_TCMP,
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,
408};
409
410static void __init _mxc_timer_init(struct imx_timer *imxtm)
411{
412 switch (imxtm->type) {
413 case GPT_TYPE_IMX1:
414 imxtm->gpt = &imx1_gpt_data;
415 break;
416 case GPT_TYPE_IMX21:
417 imxtm->gpt = &imx21_gpt_data;
418 break;
419 case GPT_TYPE_IMX31:
420 imxtm->gpt = &imx31_gpt_data;
421 break;
422 case GPT_TYPE_IMX6DL:
423 imxtm->gpt = &imx6dl_gpt_data;
424 break;
425 default:
426 BUG();
427 }
428
429 if (IS_ERR(imxtm->clk_per)) {
430 pr_err("i.MX timer: unable to get clk\n");
431 return;
432 }
433
434 if (!IS_ERR(imxtm->clk_ipg))
435 clk_prepare_enable(imxtm->clk_ipg);
436
437 clk_prepare_enable(imxtm->clk_per);
438
439 /*
440 * Initialise to a known state (all timers off, and timing reset)
441 */
442
443 writel_relaxed(0, imxtm->base + MXC_TCTL);
444 writel_relaxed(0, imxtm->base + MXC_TPRER); /* see datasheet note */
445
446 imxtm->gpt->gpt_setup_tctl(imxtm);
447
448 /* init and register the timer to the framework */
449 mxc_clocksource_init(imxtm);
450 mxc_clockevent_init(imxtm);
451}
452
453void __init mxc_timer_init(unsigned long pbase, int irq, enum imx_gpt_type type)
454{
455 struct imx_timer *imxtm;
456
457 imxtm = kzalloc(sizeof(*imxtm), GFP_KERNEL);
458 BUG_ON(!imxtm);
459
460 imxtm->clk_per = clk_get_sys("imx-gpt.0", "per");
461 imxtm->clk_ipg = clk_get_sys("imx-gpt.0", "ipg");
462
463 imxtm->base = ioremap(pbase, SZ_4K);
464 BUG_ON(!imxtm->base);
465
466 imxtm->type = type;
467 imxtm->irq = irq;
468
469 _mxc_timer_init(imxtm);
470}
471
472static void __init mxc_timer_init_dt(struct device_node *np, enum imx_gpt_type type)
473{
474 struct imx_timer *imxtm;
475 static int initialized;
476
477 /* Support one instance only */
478 if (initialized)
479 return;
480
481 imxtm = kzalloc(sizeof(*imxtm), GFP_KERNEL);
482 BUG_ON(!imxtm);
483
484 imxtm->base = of_iomap(np, 0);
485 WARN_ON(!imxtm->base);
486 imxtm->irq = irq_of_parse_and_map(np, 0);
487
488 imxtm->clk_ipg = of_clk_get_by_name(np, "ipg");
489
490 /* Try osc_per first, and fall back to per otherwise */
491 imxtm->clk_per = of_clk_get_by_name(np, "osc_per");
492 if (IS_ERR(imxtm->clk_per))
493 imxtm->clk_per = of_clk_get_by_name(np, "per");
494
495 imxtm->type = type;
496
497 _mxc_timer_init(imxtm);
498
499 initialized = 1;
500}
501
502static void __init imx1_timer_init_dt(struct device_node *np)
503{
504 mxc_timer_init_dt(np, GPT_TYPE_IMX1);
505}
506
507static void __init imx21_timer_init_dt(struct device_node *np)
508{
509 mxc_timer_init_dt(np, GPT_TYPE_IMX21);
510}
511
512static void __init imx31_timer_init_dt(struct device_node *np)
513{
514 enum imx_gpt_type type = GPT_TYPE_IMX31;
515
516 /*
517 * We were using the same compatible string for i.MX6Q/D and i.MX6DL/S
518 * GPT device, while they actually have different programming model.
519 * This is a workaround to keep the existing i.MX6DL/S DTBs continue
520 * working with the new kernel.
521 */
522 if (of_machine_is_compatible("fsl,imx6dl"))
523 type = GPT_TYPE_IMX6DL;
524
525 mxc_timer_init_dt(np, type);
526}
527
528static void __init imx6dl_timer_init_dt(struct device_node *np)
529{
530 mxc_timer_init_dt(np, GPT_TYPE_IMX6DL);
531}
532
533CLOCKSOURCE_OF_DECLARE(imx1_timer, "fsl,imx1-gpt", imx1_timer_init_dt);
534CLOCKSOURCE_OF_DECLARE(imx21_timer, "fsl,imx21-gpt", imx21_timer_init_dt);
535CLOCKSOURCE_OF_DECLARE(imx27_timer, "fsl,imx27-gpt", imx21_timer_init_dt);
536CLOCKSOURCE_OF_DECLARE(imx31_timer, "fsl,imx31-gpt", imx31_timer_init_dt);
537CLOCKSOURCE_OF_DECLARE(imx25_timer, "fsl,imx25-gpt", imx31_timer_init_dt);
538CLOCKSOURCE_OF_DECLARE(imx50_timer, "fsl,imx50-gpt", imx31_timer_init_dt);
539CLOCKSOURCE_OF_DECLARE(imx51_timer, "fsl,imx51-gpt", imx31_timer_init_dt);
540CLOCKSOURCE_OF_DECLARE(imx53_timer, "fsl,imx53-gpt", imx31_timer_init_dt);
541CLOCKSOURCE_OF_DECLARE(imx6q_timer, "fsl,imx6q-gpt", imx31_timer_init_dt);
542CLOCKSOURCE_OF_DECLARE(imx6dl_timer, "fsl,imx6dl-gpt", imx6dl_timer_init_dt);
543CLOCKSOURCE_OF_DECLARE(imx6sl_timer, "fsl,imx6sl-gpt", imx6dl_timer_init_dt);
544CLOCKSOURCE_OF_DECLARE(imx6sx_timer, "fsl,imx6sx-gpt", imx6dl_timer_init_dt);