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staging: rtl8188eu: rename HalSetBrateCfg() - style
[linux/fpc-iii.git] / drivers / clocksource / timer-imx-gpt.c
blob165fbbb1c9a049335456cc197392d197c54e93a6
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
62 struct 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 struct irqaction act;
71 };
72
73 struct imx_gpt_data {
74 int reg_tstat;
75 int reg_tcn;
76 int reg_tcmp;
77 void (*gpt_setup_tctl)(struct imx_timer *imxtm);
78 void (*gpt_irq_enable)(struct imx_timer *imxtm);
79 void (*gpt_irq_disable)(struct imx_timer *imxtm);
80 void (*gpt_irq_acknowledge)(struct imx_timer *imxtm);
81 int (*set_next_event)(unsigned long evt,
82 struct clock_event_device *ced);
83 };
84
85 static inline struct imx_timer *to_imx_timer(struct clock_event_device *ced)
86 {
87 return container_of(ced, struct imx_timer, ced);
88 }
89
90 static void imx1_gpt_irq_disable(struct imx_timer *imxtm)
91 {
92 unsigned int tmp;
93
94 tmp = readl_relaxed(imxtm->base + MXC_TCTL);
95 writel_relaxed(tmp & ~MX1_2_TCTL_IRQEN, imxtm->base + MXC_TCTL);
96 }
97 #define imx21_gpt_irq_disable imx1_gpt_irq_disable
98
99 static void imx31_gpt_irq_disable(struct imx_timer *imxtm)
100 {
101 writel_relaxed(0, imxtm->base + V2_IR);
102 }
103 #define imx6dl_gpt_irq_disable imx31_gpt_irq_disable
104
105 static void imx1_gpt_irq_enable(struct imx_timer *imxtm)
106 {
107 unsigned int tmp;
108
109 tmp = readl_relaxed(imxtm->base + MXC_TCTL);
110 writel_relaxed(tmp | MX1_2_TCTL_IRQEN, imxtm->base + MXC_TCTL);
111 }
112 #define imx21_gpt_irq_enable imx1_gpt_irq_enable
113
114 static void imx31_gpt_irq_enable(struct imx_timer *imxtm)
115 {
116 writel_relaxed(1<<0, imxtm->base + V2_IR);
117 }
118 #define imx6dl_gpt_irq_enable imx31_gpt_irq_enable
119
120 static void imx1_gpt_irq_acknowledge(struct imx_timer *imxtm)
121 {
122 writel_relaxed(0, imxtm->base + MX1_2_TSTAT);
123 }
124
125 static void imx21_gpt_irq_acknowledge(struct imx_timer *imxtm)
126 {
127 writel_relaxed(MX2_TSTAT_CAPT | MX2_TSTAT_COMP,
128 imxtm->base + MX1_2_TSTAT);
129 }
130
131 static void imx31_gpt_irq_acknowledge(struct imx_timer *imxtm)
132 {
133 writel_relaxed(V2_TSTAT_OF1, imxtm->base + V2_TSTAT);
134 }
135 #define imx6dl_gpt_irq_acknowledge imx31_gpt_irq_acknowledge
136
137 static void __iomem *sched_clock_reg;
138
139 static u64 notrace mxc_read_sched_clock(void)
140 {
141 return sched_clock_reg ? readl_relaxed(sched_clock_reg) : 0;
142 }
143
144 static struct delay_timer imx_delay_timer;
145
146 static unsigned long imx_read_current_timer(void)
147 {
148 return readl_relaxed(sched_clock_reg);
149 }
150
151 static int __init mxc_clocksource_init(struct imx_timer *imxtm)
152 {
153 unsigned int c = clk_get_rate(imxtm->clk_per);
154 void __iomem *reg = imxtm->base + imxtm->gpt->reg_tcn;
155
156 imx_delay_timer.read_current_timer = &imx_read_current_timer;
157 imx_delay_timer.freq = c;
158 register_current_timer_delay(&imx_delay_timer);
159
160 sched_clock_reg = reg;
161
162 sched_clock_register(mxc_read_sched_clock, 32, c);
163 return clocksource_mmio_init(reg, "mxc_timer1", c, 200, 32,
164 clocksource_mmio_readl_up);
165 }
166
167 /* clock event */
168
169 static int mx1_2_set_next_event(unsigned long evt,
170 struct clock_event_device *ced)
171 {
172 struct imx_timer *imxtm = to_imx_timer(ced);
173 unsigned long tcmp;
174
175 tcmp = readl_relaxed(imxtm->base + MX1_2_TCN) + evt;
176
177 writel_relaxed(tcmp, imxtm->base + MX1_2_TCMP);
178
179 return (int)(tcmp - readl_relaxed(imxtm->base + MX1_2_TCN)) < 0 ?
180 -ETIME : 0;
181 }
182
183 static int v2_set_next_event(unsigned long evt,
184 struct clock_event_device *ced)
185 {
186 struct imx_timer *imxtm = to_imx_timer(ced);
187 unsigned long tcmp;
188
189 tcmp = readl_relaxed(imxtm->base + V2_TCN) + evt;
190
191 writel_relaxed(tcmp, imxtm->base + V2_TCMP);
192
193 return evt < 0x7fffffff &&
194 (int)(tcmp - readl_relaxed(imxtm->base + V2_TCN)) < 0 ?
195 -ETIME : 0;
196 }
197
198 static int mxc_shutdown(struct clock_event_device *ced)
199 {
200 struct imx_timer *imxtm = to_imx_timer(ced);
201 unsigned long flags;
202 u32 tcn;
203
204 /*
205 * The timer interrupt generation is disabled at least
206 * for enough time to call mxc_set_next_event()
207 */
208 local_irq_save(flags);
209
210 /* Disable interrupt in GPT module */
211 imxtm->gpt->gpt_irq_disable(imxtm);
212
213 tcn = readl_relaxed(imxtm->base + imxtm->gpt->reg_tcn);
214 /* Set event time into far-far future */
215 writel_relaxed(tcn - 3, imxtm->base + imxtm->gpt->reg_tcmp);
216
217 /* Clear pending interrupt */
218 imxtm->gpt->gpt_irq_acknowledge(imxtm);
219
220 #ifdef DEBUG
221 printk(KERN_INFO "%s: changing mode\n", __func__);
222 #endif /* DEBUG */
223
224 local_irq_restore(flags);
225
226 return 0;
227 }
228
229 static int mxc_set_oneshot(struct clock_event_device *ced)
230 {
231 struct imx_timer *imxtm = to_imx_timer(ced);
232 unsigned long flags;
233
234 /*
235 * The timer interrupt generation is disabled at least
236 * for enough time to call mxc_set_next_event()
237 */
238 local_irq_save(flags);
239
240 /* Disable interrupt in GPT module */
241 imxtm->gpt->gpt_irq_disable(imxtm);
242
243 if (!clockevent_state_oneshot(ced)) {
244 u32 tcn = readl_relaxed(imxtm->base + imxtm->gpt->reg_tcn);
245 /* Set event time into far-far future */
246 writel_relaxed(tcn - 3, imxtm->base + imxtm->gpt->reg_tcmp);
247
248 /* Clear pending interrupt */
249 imxtm->gpt->gpt_irq_acknowledge(imxtm);
250 }
251
252 #ifdef DEBUG
253 printk(KERN_INFO "%s: changing mode\n", __func__);
254 #endif /* DEBUG */
255
256 /*
257 * Do not put overhead of interrupt enable/disable into
258 * mxc_set_next_event(), the core has about 4 minutes
259 * to call mxc_set_next_event() or shutdown clock after
260 * mode switching
261 */
262 imxtm->gpt->gpt_irq_enable(imxtm);
263 local_irq_restore(flags);
264
265 return 0;
266 }
267
268 /*
269 * IRQ handler for the timer
270 */
271 static irqreturn_t mxc_timer_interrupt(int irq, void *dev_id)
272 {
273 struct clock_event_device *ced = dev_id;
274 struct imx_timer *imxtm = to_imx_timer(ced);
275 uint32_t tstat;
276
277 tstat = readl_relaxed(imxtm->base + imxtm->gpt->reg_tstat);
278
279 imxtm->gpt->gpt_irq_acknowledge(imxtm);
280
281 ced->event_handler(ced);
282
283 return IRQ_HANDLED;
284 }
285
286 static int __init mxc_clockevent_init(struct imx_timer *imxtm)
287 {
288 struct clock_event_device *ced = &imxtm->ced;
289 struct irqaction *act = &imxtm->act;
290
291 ced->name = "mxc_timer1";
292 ced->features = CLOCK_EVT_FEAT_ONESHOT | CLOCK_EVT_FEAT_DYNIRQ;
293 ced->set_state_shutdown = mxc_shutdown;
294 ced->set_state_oneshot = mxc_set_oneshot;
295 ced->tick_resume = mxc_shutdown;
296 ced->set_next_event = imxtm->gpt->set_next_event;
297 ced->rating = 200;
298 ced->cpumask = cpumask_of(0);
299 ced->irq = imxtm->irq;
300 clockevents_config_and_register(ced, clk_get_rate(imxtm->clk_per),
301 0xff, 0xfffffffe);
302
303 act->name = "i.MX Timer Tick";
304 act->flags = IRQF_TIMER | IRQF_IRQPOLL;
305 act->handler = mxc_timer_interrupt;
306 act->dev_id = ced;
307
308 return setup_irq(imxtm->irq, act);
309 }
310
311 static void imx1_gpt_setup_tctl(struct imx_timer *imxtm)
312 {
313 u32 tctl_val;
314
315 tctl_val = MX1_2_TCTL_FRR | MX1_2_TCTL_CLK_PCLK1 | MXC_TCTL_TEN;
316 writel_relaxed(tctl_val, imxtm->base + MXC_TCTL);
317 }
318 #define imx21_gpt_setup_tctl imx1_gpt_setup_tctl
319
320 static void imx31_gpt_setup_tctl(struct imx_timer *imxtm)
321 {
322 u32 tctl_val;
323
324 tctl_val = V2_TCTL_FRR | V2_TCTL_WAITEN | MXC_TCTL_TEN;
325 if (clk_get_rate(imxtm->clk_per) == V2_TIMER_RATE_OSC_DIV8)
326 tctl_val |= V2_TCTL_CLK_OSC_DIV8;
327 else
328 tctl_val |= V2_TCTL_CLK_PER;
329
330 writel_relaxed(tctl_val, imxtm->base + MXC_TCTL);
331 }
332
333 static void imx6dl_gpt_setup_tctl(struct imx_timer *imxtm)
334 {
335 u32 tctl_val;
336
337 tctl_val = V2_TCTL_FRR | V2_TCTL_WAITEN | MXC_TCTL_TEN;
338 if (clk_get_rate(imxtm->clk_per) == V2_TIMER_RATE_OSC_DIV8) {
339 tctl_val |= V2_TCTL_CLK_OSC_DIV8;
340 /* 24 / 8 = 3 MHz */
341 writel_relaxed(7 << V2_TPRER_PRE24M, imxtm->base + MXC_TPRER);
342 tctl_val |= V2_TCTL_24MEN;
343 } else {
344 tctl_val |= V2_TCTL_CLK_PER;
345 }
346
347 writel_relaxed(tctl_val, imxtm->base + MXC_TCTL);
348 }
349
350 static const struct imx_gpt_data imx1_gpt_data = {
351 .reg_tstat = MX1_2_TSTAT,
352 .reg_tcn = MX1_2_TCN,
353 .reg_tcmp = MX1_2_TCMP,
354 .gpt_irq_enable = imx1_gpt_irq_enable,
355 .gpt_irq_disable = imx1_gpt_irq_disable,
356 .gpt_irq_acknowledge = imx1_gpt_irq_acknowledge,
357 .gpt_setup_tctl = imx1_gpt_setup_tctl,
358 .set_next_event = mx1_2_set_next_event,
359 };
360
361 static const struct imx_gpt_data imx21_gpt_data = {
362 .reg_tstat = MX1_2_TSTAT,
363 .reg_tcn = MX1_2_TCN,
364 .reg_tcmp = MX1_2_TCMP,
365 .gpt_irq_enable = imx21_gpt_irq_enable,
366 .gpt_irq_disable = imx21_gpt_irq_disable,
367 .gpt_irq_acknowledge = imx21_gpt_irq_acknowledge,
368 .gpt_setup_tctl = imx21_gpt_setup_tctl,
369 .set_next_event = mx1_2_set_next_event,
370 };
371
372 static const struct imx_gpt_data imx31_gpt_data = {
373 .reg_tstat = V2_TSTAT,
374 .reg_tcn = V2_TCN,
375 .reg_tcmp = V2_TCMP,
376 .gpt_irq_enable = imx31_gpt_irq_enable,
377 .gpt_irq_disable = imx31_gpt_irq_disable,
378 .gpt_irq_acknowledge = imx31_gpt_irq_acknowledge,
379 .gpt_setup_tctl = imx31_gpt_setup_tctl,
380 .set_next_event = v2_set_next_event,
381 };
382
383 static const struct imx_gpt_data imx6dl_gpt_data = {
384 .reg_tstat = V2_TSTAT,
385 .reg_tcn = V2_TCN,
386 .reg_tcmp = V2_TCMP,
387 .gpt_irq_enable = imx6dl_gpt_irq_enable,
388 .gpt_irq_disable = imx6dl_gpt_irq_disable,
389 .gpt_irq_acknowledge = imx6dl_gpt_irq_acknowledge,
390 .gpt_setup_tctl = imx6dl_gpt_setup_tctl,
391 .set_next_event = v2_set_next_event,
392 };
393
394 static int __init _mxc_timer_init(struct imx_timer *imxtm)
395 {
396 int ret;
397
398 switch (imxtm->type) {
399 case GPT_TYPE_IMX1:
400 imxtm->gpt = &imx1_gpt_data;
401 break;
402 case GPT_TYPE_IMX21:
403 imxtm->gpt = &imx21_gpt_data;
404 break;
405 case GPT_TYPE_IMX31:
406 imxtm->gpt = &imx31_gpt_data;
407 break;
408 case GPT_TYPE_IMX6DL:
409 imxtm->gpt = &imx6dl_gpt_data;
410 break;
411 default:
412 return -EINVAL;
413 }
414
415 if (IS_ERR(imxtm->clk_per)) {
416 pr_err("i.MX timer: unable to get clk\n");
417 return PTR_ERR(imxtm->clk_per);
418 }
419
420 if (!IS_ERR(imxtm->clk_ipg))
421 clk_prepare_enable(imxtm->clk_ipg);
422
423 clk_prepare_enable(imxtm->clk_per);
424
425 /*
426 * Initialise to a known state (all timers off, and timing reset)
427 */
428
429 writel_relaxed(0, imxtm->base + MXC_TCTL);
430 writel_relaxed(0, imxtm->base + MXC_TPRER); /* see datasheet note */
431
432 imxtm->gpt->gpt_setup_tctl(imxtm);
433
434 /* init and register the timer to the framework */
435 ret = mxc_clocksource_init(imxtm);
436 if (ret)
437 return ret;
438
439 return mxc_clockevent_init(imxtm);
440 }
441
442 void __init mxc_timer_init(unsigned long pbase, int irq, enum imx_gpt_type type)
443 {
444 struct imx_timer *imxtm;
445
446 imxtm = kzalloc(sizeof(*imxtm), GFP_KERNEL);
447 BUG_ON(!imxtm);
448
449 imxtm->clk_per = clk_get_sys("imx-gpt.0", "per");
450 imxtm->clk_ipg = clk_get_sys("imx-gpt.0", "ipg");
451
452 imxtm->base = ioremap(pbase, SZ_4K);
453 BUG_ON(!imxtm->base);
454
455 imxtm->type = type;
456 imxtm->irq = irq;
457
458 _mxc_timer_init(imxtm);
459 }
460
461 static int __init mxc_timer_init_dt(struct device_node *np, enum imx_gpt_type type)
462 {
463 struct imx_timer *imxtm;
464 static int initialized;
465 int ret;
466
467 /* Support one instance only */
468 if (initialized)
469 return 0;
470
471 imxtm = kzalloc(sizeof(*imxtm), GFP_KERNEL);
472 if (!imxtm)
473 return -ENOMEM;
474
475 imxtm->base = of_iomap(np, 0);
476 if (!imxtm->base)
477 return -ENXIO;
478
479 imxtm->irq = irq_of_parse_and_map(np, 0);
480 if (imxtm->irq <= 0)
481 return -EINVAL;
482
483 imxtm->clk_ipg = of_clk_get_by_name(np, "ipg");
484
485 /* Try osc_per first, and fall back to per otherwise */
486 imxtm->clk_per = of_clk_get_by_name(np, "osc_per");
487 if (IS_ERR(imxtm->clk_per))
488 imxtm->clk_per = of_clk_get_by_name(np, "per");
489
490 imxtm->type = type;
491
492 ret = _mxc_timer_init(imxtm);
493 if (ret)
494 return ret;
495
496 initialized = 1;
497
498 return 0;
499 }
500
501 static int __init imx1_timer_init_dt(struct device_node *np)
502 {
503 return mxc_timer_init_dt(np, GPT_TYPE_IMX1);
504 }
505
506 static int __init imx21_timer_init_dt(struct device_node *np)
507 {
508 return mxc_timer_init_dt(np, GPT_TYPE_IMX21);
509 }
510
511 static int __init imx31_timer_init_dt(struct device_node *np)
512 {
513 enum imx_gpt_type type = GPT_TYPE_IMX31;
514
515 /*
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.
520 */
521 if (of_machine_is_compatible("fsl,imx6dl"))
522 type = GPT_TYPE_IMX6DL;
523
524 return mxc_timer_init_dt(np, type);
525 }
526
527 static int __init imx6dl_timer_init_dt(struct device_node *np)
528 {
529 return mxc_timer_init_dt(np, GPT_TYPE_IMX6DL);
530 }
531
532 TIMER_OF_DECLARE(imx1_timer, "fsl,imx1-gpt", imx1_timer_init_dt);
533 TIMER_OF_DECLARE(imx21_timer, "fsl,imx21-gpt", imx21_timer_init_dt);
534 TIMER_OF_DECLARE(imx27_timer, "fsl,imx27-gpt", imx21_timer_init_dt);
535 TIMER_OF_DECLARE(imx31_timer, "fsl,imx31-gpt", imx31_timer_init_dt);
536 TIMER_OF_DECLARE(imx25_timer, "fsl,imx25-gpt", imx31_timer_init_dt);
537 TIMER_OF_DECLARE(imx50_timer, "fsl,imx50-gpt", imx31_timer_init_dt);
538 TIMER_OF_DECLARE(imx51_timer, "fsl,imx51-gpt", imx31_timer_init_dt);
539 TIMER_OF_DECLARE(imx53_timer, "fsl,imx53-gpt", imx31_timer_init_dt);
540 TIMER_OF_DECLARE(imx6q_timer, "fsl,imx6q-gpt", imx31_timer_init_dt);
541 TIMER_OF_DECLARE(imx6dl_timer, "fsl,imx6dl-gpt", imx6dl_timer_init_dt);
542 TIMER_OF_DECLARE(imx6sl_timer, "fsl,imx6sl-gpt", imx6dl_timer_init_dt);
543 TIMER_OF_DECLARE(imx6sx_timer, "fsl,imx6sx-gpt", imx6dl_timer_init_dt);
Linux with added FPC-III support