xref: /openbmc/linux/drivers/bus/ti-sysc.c (revision 5b628549)
1 /*
2  * ti-sysc.c - Texas Instruments sysc interconnect target driver
3  *
4  * This program is free software; you can redistribute it and/or modify
5  * it under the terms of the GNU General Public License version 2 as
6  * published by the Free Software Foundation.
7  *
8  * This program is distributed "as is" WITHOUT ANY WARRANTY of any
9  * kind, whether express or implied; without even the implied warranty
10  * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
11  * GNU General Public License for more details.
12  */
13 
14 #include <linux/io.h>
15 #include <linux/clk.h>
16 #include <linux/clkdev.h>
17 #include <linux/delay.h>
18 #include <linux/module.h>
19 #include <linux/platform_device.h>
20 #include <linux/pm_domain.h>
21 #include <linux/pm_runtime.h>
22 #include <linux/reset.h>
23 #include <linux/of_address.h>
24 #include <linux/of_platform.h>
25 #include <linux/slab.h>
26 #include <linux/iopoll.h>
27 
28 #include <linux/platform_data/ti-sysc.h>
29 
30 #include <dt-bindings/bus/ti-sysc.h>
31 
32 #define MAX_MODULE_SOFTRESET_WAIT		10000
33 
34 static const char * const reg_names[] = { "rev", "sysc", "syss", };
35 
36 enum sysc_clocks {
37 	SYSC_FCK,
38 	SYSC_ICK,
39 	SYSC_OPTFCK0,
40 	SYSC_OPTFCK1,
41 	SYSC_OPTFCK2,
42 	SYSC_OPTFCK3,
43 	SYSC_OPTFCK4,
44 	SYSC_OPTFCK5,
45 	SYSC_OPTFCK6,
46 	SYSC_OPTFCK7,
47 	SYSC_MAX_CLOCKS,
48 };
49 
50 static const char * const clock_names[SYSC_ICK + 1] = { "fck", "ick", };
51 
52 #define SYSC_IDLEMODE_MASK		3
53 #define SYSC_CLOCKACTIVITY_MASK		3
54 
55 /**
56  * struct sysc - TI sysc interconnect target module registers and capabilities
57  * @dev: struct device pointer
58  * @module_pa: physical address of the interconnect target module
59  * @module_size: size of the interconnect target module
60  * @module_va: virtual address of the interconnect target module
61  * @offsets: register offsets from module base
62  * @clocks: clocks used by the interconnect target module
63  * @clock_roles: clock role names for the found clocks
64  * @nr_clocks: number of clocks used by the interconnect target module
65  * @legacy_mode: configured for legacy mode if set
66  * @cap: interconnect target module capabilities
67  * @cfg: interconnect target module configuration
68  * @name: name if available
69  * @revision: interconnect target module revision
70  * @needs_resume: runtime resume needed on resume from suspend
71  */
72 struct sysc {
73 	struct device *dev;
74 	u64 module_pa;
75 	u32 module_size;
76 	void __iomem *module_va;
77 	int offsets[SYSC_MAX_REGS];
78 	struct clk **clocks;
79 	const char **clock_roles;
80 	int nr_clocks;
81 	struct reset_control *rsts;
82 	const char *legacy_mode;
83 	const struct sysc_capabilities *cap;
84 	struct sysc_config cfg;
85 	struct ti_sysc_cookie cookie;
86 	const char *name;
87 	u32 revision;
88 	bool enabled;
89 	bool needs_resume;
90 	bool child_needs_resume;
91 	struct delayed_work idle_work;
92 };
93 
94 static void sysc_parse_dts_quirks(struct sysc *ddata, struct device_node *np,
95 				  bool is_child);
96 
97 void sysc_write(struct sysc *ddata, int offset, u32 value)
98 {
99 	writel_relaxed(value, ddata->module_va + offset);
100 }
101 
102 static u32 sysc_read(struct sysc *ddata, int offset)
103 {
104 	if (ddata->cfg.quirks & SYSC_QUIRK_16BIT) {
105 		u32 val;
106 
107 		val = readw_relaxed(ddata->module_va + offset);
108 		val |= (readw_relaxed(ddata->module_va + offset + 4) << 16);
109 
110 		return val;
111 	}
112 
113 	return readl_relaxed(ddata->module_va + offset);
114 }
115 
116 static bool sysc_opt_clks_needed(struct sysc *ddata)
117 {
118 	return !!(ddata->cfg.quirks & SYSC_QUIRK_OPT_CLKS_NEEDED);
119 }
120 
121 static u32 sysc_read_revision(struct sysc *ddata)
122 {
123 	int offset = ddata->offsets[SYSC_REVISION];
124 
125 	if (offset < 0)
126 		return 0;
127 
128 	return sysc_read(ddata, offset);
129 }
130 
131 static int sysc_get_one_clock(struct sysc *ddata, const char *name)
132 {
133 	int error, i, index = -ENODEV;
134 
135 	if (!strncmp(clock_names[SYSC_FCK], name, 3))
136 		index = SYSC_FCK;
137 	else if (!strncmp(clock_names[SYSC_ICK], name, 3))
138 		index = SYSC_ICK;
139 
140 	if (index < 0) {
141 		for (i = SYSC_OPTFCK0; i < SYSC_MAX_CLOCKS; i++) {
142 			if (!ddata->clocks[i]) {
143 				index = i;
144 				break;
145 			}
146 		}
147 	}
148 
149 	if (index < 0) {
150 		dev_err(ddata->dev, "clock %s not added\n", name);
151 		return index;
152 	}
153 
154 	ddata->clocks[index] = devm_clk_get(ddata->dev, name);
155 	if (IS_ERR(ddata->clocks[index])) {
156 		if (PTR_ERR(ddata->clocks[index]) == -ENOENT)
157 			return 0;
158 
159 		dev_err(ddata->dev, "clock get error for %s: %li\n",
160 			name, PTR_ERR(ddata->clocks[index]));
161 
162 		return PTR_ERR(ddata->clocks[index]);
163 	}
164 
165 	error = clk_prepare(ddata->clocks[index]);
166 	if (error) {
167 		dev_err(ddata->dev, "clock prepare error for %s: %i\n",
168 			name, error);
169 
170 		return error;
171 	}
172 
173 	return 0;
174 }
175 
176 static int sysc_get_clocks(struct sysc *ddata)
177 {
178 	struct device_node *np = ddata->dev->of_node;
179 	struct property *prop;
180 	const char *name;
181 	int nr_fck = 0, nr_ick = 0, i, error = 0;
182 
183 	ddata->clock_roles = devm_kcalloc(ddata->dev,
184 					  SYSC_MAX_CLOCKS,
185 					  sizeof(*ddata->clock_roles),
186 					  GFP_KERNEL);
187 	if (!ddata->clock_roles)
188 		return -ENOMEM;
189 
190 	of_property_for_each_string(np, "clock-names", prop, name) {
191 		if (!strncmp(clock_names[SYSC_FCK], name, 3))
192 			nr_fck++;
193 		if (!strncmp(clock_names[SYSC_ICK], name, 3))
194 			nr_ick++;
195 		ddata->clock_roles[ddata->nr_clocks] = name;
196 		ddata->nr_clocks++;
197 	}
198 
199 	if (ddata->nr_clocks < 1)
200 		return 0;
201 
202 	if (ddata->nr_clocks > SYSC_MAX_CLOCKS) {
203 		dev_err(ddata->dev, "too many clocks for %pOF\n", np);
204 
205 		return -EINVAL;
206 	}
207 
208 	if (nr_fck > 1 || nr_ick > 1) {
209 		dev_err(ddata->dev, "max one fck and ick for %pOF\n", np);
210 
211 		return -EINVAL;
212 	}
213 
214 	ddata->clocks = devm_kcalloc(ddata->dev,
215 				     ddata->nr_clocks, sizeof(*ddata->clocks),
216 				     GFP_KERNEL);
217 	if (!ddata->clocks)
218 		return -ENOMEM;
219 
220 	for (i = 0; i < SYSC_MAX_CLOCKS; i++) {
221 		const char *name = ddata->clock_roles[i];
222 
223 		if (!name)
224 			continue;
225 
226 		error = sysc_get_one_clock(ddata, name);
227 		if (error && error != -ENOENT)
228 			return error;
229 	}
230 
231 	return 0;
232 }
233 
234 /**
235  * sysc_init_resets - reset module on init
236  * @ddata: device driver data
237  *
238  * A module can have both OCP softreset control and external rstctrl.
239  * If more complicated rstctrl resets are needed, please handle these
240  * directly from the child device driver and map only the module reset
241  * for the parent interconnect target module device.
242  *
243  * Automatic reset of the module on init can be skipped with the
244  * "ti,no-reset-on-init" device tree property.
245  */
246 static int sysc_init_resets(struct sysc *ddata)
247 {
248 	int error;
249 
250 	ddata->rsts =
251 		devm_reset_control_array_get_optional_exclusive(ddata->dev);
252 	if (IS_ERR(ddata->rsts))
253 		return PTR_ERR(ddata->rsts);
254 
255 	if (ddata->cfg.quirks & SYSC_QUIRK_NO_RESET_ON_INIT)
256 		goto deassert;
257 
258 	error = reset_control_assert(ddata->rsts);
259 	if (error)
260 		return error;
261 
262 deassert:
263 	error = reset_control_deassert(ddata->rsts);
264 	if (error)
265 		return error;
266 
267 	return 0;
268 }
269 
270 /**
271  * sysc_parse_and_check_child_range - parses module IO region from ranges
272  * @ddata: device driver data
273  *
274  * In general we only need rev, syss, and sysc registers and not the whole
275  * module range. But we do want the offsets for these registers from the
276  * module base. This allows us to check them against the legacy hwmod
277  * platform data. Let's also check the ranges are configured properly.
278  */
279 static int sysc_parse_and_check_child_range(struct sysc *ddata)
280 {
281 	struct device_node *np = ddata->dev->of_node;
282 	const __be32 *ranges;
283 	u32 nr_addr, nr_size;
284 	int len, error;
285 
286 	ranges = of_get_property(np, "ranges", &len);
287 	if (!ranges) {
288 		dev_err(ddata->dev, "missing ranges for %pOF\n", np);
289 
290 		return -ENOENT;
291 	}
292 
293 	len /= sizeof(*ranges);
294 
295 	if (len < 3) {
296 		dev_err(ddata->dev, "incomplete ranges for %pOF\n", np);
297 
298 		return -EINVAL;
299 	}
300 
301 	error = of_property_read_u32(np, "#address-cells", &nr_addr);
302 	if (error)
303 		return -ENOENT;
304 
305 	error = of_property_read_u32(np, "#size-cells", &nr_size);
306 	if (error)
307 		return -ENOENT;
308 
309 	if (nr_addr != 1 || nr_size != 1) {
310 		dev_err(ddata->dev, "invalid ranges for %pOF\n", np);
311 
312 		return -EINVAL;
313 	}
314 
315 	ranges++;
316 	ddata->module_pa = of_translate_address(np, ranges++);
317 	ddata->module_size = be32_to_cpup(ranges);
318 
319 	return 0;
320 }
321 
322 static struct device_node *stdout_path;
323 
324 static void sysc_init_stdout_path(struct sysc *ddata)
325 {
326 	struct device_node *np = NULL;
327 	const char *uart;
328 
329 	if (IS_ERR(stdout_path))
330 		return;
331 
332 	if (stdout_path)
333 		return;
334 
335 	np = of_find_node_by_path("/chosen");
336 	if (!np)
337 		goto err;
338 
339 	uart = of_get_property(np, "stdout-path", NULL);
340 	if (!uart)
341 		goto err;
342 
343 	np = of_find_node_by_path(uart);
344 	if (!np)
345 		goto err;
346 
347 	stdout_path = np;
348 
349 	return;
350 
351 err:
352 	stdout_path = ERR_PTR(-ENODEV);
353 }
354 
355 static void sysc_check_quirk_stdout(struct sysc *ddata,
356 				    struct device_node *np)
357 {
358 	sysc_init_stdout_path(ddata);
359 	if (np != stdout_path)
360 		return;
361 
362 	ddata->cfg.quirks |= SYSC_QUIRK_NO_IDLE_ON_INIT |
363 				SYSC_QUIRK_NO_RESET_ON_INIT;
364 }
365 
366 /**
367  * sysc_check_one_child - check child configuration
368  * @ddata: device driver data
369  * @np: child device node
370  *
371  * Let's avoid messy situations where we have new interconnect target
372  * node but children have "ti,hwmods". These belong to the interconnect
373  * target node and are managed by this driver.
374  */
375 static int sysc_check_one_child(struct sysc *ddata,
376 				struct device_node *np)
377 {
378 	const char *name;
379 
380 	name = of_get_property(np, "ti,hwmods", NULL);
381 	if (name)
382 		dev_warn(ddata->dev, "really a child ti,hwmods property?");
383 
384 	sysc_check_quirk_stdout(ddata, np);
385 	sysc_parse_dts_quirks(ddata, np, true);
386 
387 	return 0;
388 }
389 
390 static int sysc_check_children(struct sysc *ddata)
391 {
392 	struct device_node *child;
393 	int error;
394 
395 	for_each_child_of_node(ddata->dev->of_node, child) {
396 		error = sysc_check_one_child(ddata, child);
397 		if (error)
398 			return error;
399 	}
400 
401 	return 0;
402 }
403 
404 /*
405  * So far only I2C uses 16-bit read access with clockactivity with revision
406  * in two registers with stride of 4. We can detect this based on the rev
407  * register size to configure things far enough to be able to properly read
408  * the revision register.
409  */
410 static void sysc_check_quirk_16bit(struct sysc *ddata, struct resource *res)
411 {
412 	if (resource_size(res) == 8)
413 		ddata->cfg.quirks |= SYSC_QUIRK_16BIT | SYSC_QUIRK_USE_CLOCKACT;
414 }
415 
416 /**
417  * sysc_parse_one - parses the interconnect target module registers
418  * @ddata: device driver data
419  * @reg: register to parse
420  */
421 static int sysc_parse_one(struct sysc *ddata, enum sysc_registers reg)
422 {
423 	struct resource *res;
424 	const char *name;
425 
426 	switch (reg) {
427 	case SYSC_REVISION:
428 	case SYSC_SYSCONFIG:
429 	case SYSC_SYSSTATUS:
430 		name = reg_names[reg];
431 		break;
432 	default:
433 		return -EINVAL;
434 	}
435 
436 	res = platform_get_resource_byname(to_platform_device(ddata->dev),
437 					   IORESOURCE_MEM, name);
438 	if (!res) {
439 		ddata->offsets[reg] = -ENODEV;
440 
441 		return 0;
442 	}
443 
444 	ddata->offsets[reg] = res->start - ddata->module_pa;
445 	if (reg == SYSC_REVISION)
446 		sysc_check_quirk_16bit(ddata, res);
447 
448 	return 0;
449 }
450 
451 static int sysc_parse_registers(struct sysc *ddata)
452 {
453 	int i, error;
454 
455 	for (i = 0; i < SYSC_MAX_REGS; i++) {
456 		error = sysc_parse_one(ddata, i);
457 		if (error)
458 			return error;
459 	}
460 
461 	return 0;
462 }
463 
464 /**
465  * sysc_check_registers - check for misconfigured register overlaps
466  * @ddata: device driver data
467  */
468 static int sysc_check_registers(struct sysc *ddata)
469 {
470 	int i, j, nr_regs = 0, nr_matches = 0;
471 
472 	for (i = 0; i < SYSC_MAX_REGS; i++) {
473 		if (ddata->offsets[i] < 0)
474 			continue;
475 
476 		if (ddata->offsets[i] > (ddata->module_size - 4)) {
477 			dev_err(ddata->dev, "register outside module range");
478 
479 				return -EINVAL;
480 		}
481 
482 		for (j = 0; j < SYSC_MAX_REGS; j++) {
483 			if (ddata->offsets[j] < 0)
484 				continue;
485 
486 			if (ddata->offsets[i] == ddata->offsets[j])
487 				nr_matches++;
488 		}
489 		nr_regs++;
490 	}
491 
492 	if (nr_regs < 1) {
493 		dev_err(ddata->dev, "missing registers\n");
494 
495 		return -EINVAL;
496 	}
497 
498 	if (nr_matches > nr_regs) {
499 		dev_err(ddata->dev, "overlapping registers: (%i/%i)",
500 			nr_regs, nr_matches);
501 
502 		return -EINVAL;
503 	}
504 
505 	return 0;
506 }
507 
508 /**
509  * syc_ioremap - ioremap register space for the interconnect target module
510  * @ddata: device driver data
511  *
512  * Note that the interconnect target module registers can be anywhere
513  * within the interconnect target module range. For example, SGX has
514  * them at offset 0x1fc00 in the 32MB module address space. And cpsw
515  * has them at offset 0x1200 in the CPSW_WR child. Usually the
516  * the interconnect target module registers are at the beginning of
517  * the module range though.
518  */
519 static int sysc_ioremap(struct sysc *ddata)
520 {
521 	int size;
522 
523 	size = max3(ddata->offsets[SYSC_REVISION],
524 		    ddata->offsets[SYSC_SYSCONFIG],
525 		    ddata->offsets[SYSC_SYSSTATUS]);
526 
527 	if (size < 0 || (size + sizeof(u32)) > ddata->module_size)
528 		return -EINVAL;
529 
530 	ddata->module_va = devm_ioremap(ddata->dev,
531 					ddata->module_pa,
532 					size + sizeof(u32));
533 	if (!ddata->module_va)
534 		return -EIO;
535 
536 	return 0;
537 }
538 
539 /**
540  * sysc_map_and_check_registers - ioremap and check device registers
541  * @ddata: device driver data
542  */
543 static int sysc_map_and_check_registers(struct sysc *ddata)
544 {
545 	int error;
546 
547 	error = sysc_parse_and_check_child_range(ddata);
548 	if (error)
549 		return error;
550 
551 	error = sysc_check_children(ddata);
552 	if (error)
553 		return error;
554 
555 	error = sysc_parse_registers(ddata);
556 	if (error)
557 		return error;
558 
559 	error = sysc_ioremap(ddata);
560 	if (error)
561 		return error;
562 
563 	error = sysc_check_registers(ddata);
564 	if (error)
565 		return error;
566 
567 	return 0;
568 }
569 
570 /**
571  * sysc_show_rev - read and show interconnect target module revision
572  * @bufp: buffer to print the information to
573  * @ddata: device driver data
574  */
575 static int sysc_show_rev(char *bufp, struct sysc *ddata)
576 {
577 	int len;
578 
579 	if (ddata->offsets[SYSC_REVISION] < 0)
580 		return sprintf(bufp, ":NA");
581 
582 	len = sprintf(bufp, ":%08x", ddata->revision);
583 
584 	return len;
585 }
586 
587 static int sysc_show_reg(struct sysc *ddata,
588 			 char *bufp, enum sysc_registers reg)
589 {
590 	if (ddata->offsets[reg] < 0)
591 		return sprintf(bufp, ":NA");
592 
593 	return sprintf(bufp, ":%x", ddata->offsets[reg]);
594 }
595 
596 static int sysc_show_name(char *bufp, struct sysc *ddata)
597 {
598 	if (!ddata->name)
599 		return 0;
600 
601 	return sprintf(bufp, ":%s", ddata->name);
602 }
603 
604 /**
605  * sysc_show_registers - show information about interconnect target module
606  * @ddata: device driver data
607  */
608 static void sysc_show_registers(struct sysc *ddata)
609 {
610 	char buf[128];
611 	char *bufp = buf;
612 	int i;
613 
614 	for (i = 0; i < SYSC_MAX_REGS; i++)
615 		bufp += sysc_show_reg(ddata, bufp, i);
616 
617 	bufp += sysc_show_rev(bufp, ddata);
618 	bufp += sysc_show_name(bufp, ddata);
619 
620 	dev_dbg(ddata->dev, "%llx:%x%s\n",
621 		ddata->module_pa, ddata->module_size,
622 		buf);
623 }
624 
625 static int __maybe_unused sysc_runtime_suspend(struct device *dev)
626 {
627 	struct ti_sysc_platform_data *pdata;
628 	struct sysc *ddata;
629 	int error = 0, i;
630 
631 	ddata = dev_get_drvdata(dev);
632 
633 	if (!ddata->enabled)
634 		return 0;
635 
636 	if (ddata->legacy_mode) {
637 		pdata = dev_get_platdata(ddata->dev);
638 		if (!pdata)
639 			return 0;
640 
641 		if (!pdata->idle_module)
642 			return -ENODEV;
643 
644 		error = pdata->idle_module(dev, &ddata->cookie);
645 		if (error)
646 			dev_err(dev, "%s: could not idle: %i\n",
647 				__func__, error);
648 
649 		goto idled;
650 	}
651 
652 	for (i = 0; i < ddata->nr_clocks; i++) {
653 		if (IS_ERR_OR_NULL(ddata->clocks[i]))
654 			continue;
655 
656 		if (i >= SYSC_OPTFCK0 && !sysc_opt_clks_needed(ddata))
657 			break;
658 
659 		clk_disable(ddata->clocks[i]);
660 	}
661 
662 idled:
663 	ddata->enabled = false;
664 
665 	return error;
666 }
667 
668 static int __maybe_unused sysc_runtime_resume(struct device *dev)
669 {
670 	struct ti_sysc_platform_data *pdata;
671 	struct sysc *ddata;
672 	int error = 0, i;
673 
674 	ddata = dev_get_drvdata(dev);
675 
676 	if (ddata->enabled)
677 		return 0;
678 
679 	if (ddata->legacy_mode) {
680 		pdata = dev_get_platdata(ddata->dev);
681 		if (!pdata)
682 			return 0;
683 
684 		if (!pdata->enable_module)
685 			return -ENODEV;
686 
687 		error = pdata->enable_module(dev, &ddata->cookie);
688 		if (error)
689 			dev_err(dev, "%s: could not enable: %i\n",
690 				__func__, error);
691 
692 		goto awake;
693 	}
694 
695 	for (i = 0; i < ddata->nr_clocks; i++) {
696 		if (IS_ERR_OR_NULL(ddata->clocks[i]))
697 			continue;
698 
699 		if (i >= SYSC_OPTFCK0 && !sysc_opt_clks_needed(ddata))
700 			break;
701 
702 		error = clk_enable(ddata->clocks[i]);
703 		if (error)
704 			return error;
705 	}
706 
707 awake:
708 	ddata->enabled = true;
709 
710 	return error;
711 }
712 
713 static int __maybe_unused sysc_noirq_suspend(struct device *dev)
714 {
715 	struct sysc *ddata;
716 
717 	ddata = dev_get_drvdata(dev);
718 
719 	if (ddata->cfg.quirks & SYSC_QUIRK_LEGACY_IDLE)
720 		return 0;
721 
722 	return pm_runtime_force_suspend(dev);
723 }
724 
725 static int __maybe_unused sysc_noirq_resume(struct device *dev)
726 {
727 	struct sysc *ddata;
728 
729 	ddata = dev_get_drvdata(dev);
730 
731 	if (ddata->cfg.quirks & SYSC_QUIRK_LEGACY_IDLE)
732 		return 0;
733 
734 	return pm_runtime_force_resume(dev);
735 }
736 
737 static const struct dev_pm_ops sysc_pm_ops = {
738 	SET_NOIRQ_SYSTEM_SLEEP_PM_OPS(sysc_noirq_suspend, sysc_noirq_resume)
739 	SET_RUNTIME_PM_OPS(sysc_runtime_suspend,
740 			   sysc_runtime_resume,
741 			   NULL)
742 };
743 
744 /* Module revision register based quirks */
745 struct sysc_revision_quirk {
746 	const char *name;
747 	u32 base;
748 	int rev_offset;
749 	int sysc_offset;
750 	int syss_offset;
751 	u32 revision;
752 	u32 revision_mask;
753 	u32 quirks;
754 };
755 
756 #define SYSC_QUIRK(optname, optbase, optrev, optsysc, optsyss,		\
757 		   optrev_val, optrevmask, optquirkmask)		\
758 	{								\
759 		.name = (optname),					\
760 		.base = (optbase),					\
761 		.rev_offset = (optrev),					\
762 		.sysc_offset = (optsysc),				\
763 		.syss_offset = (optsyss),				\
764 		.revision = (optrev_val),				\
765 		.revision_mask = (optrevmask),				\
766 		.quirks = (optquirkmask),				\
767 	}
768 
769 static const struct sysc_revision_quirk sysc_revision_quirks[] = {
770 	/* These drivers need to be fixed to not use pm_runtime_irq_safe() */
771 	SYSC_QUIRK("gpio", 0, 0, 0x10, 0x114, 0x50600801, 0xffff00ff,
772 		   SYSC_QUIRK_LEGACY_IDLE | SYSC_QUIRK_OPT_CLKS_IN_RESET),
773 	SYSC_QUIRK("mmu", 0, 0, 0x10, 0x14, 0x00000020, 0xffffffff,
774 		   SYSC_QUIRK_LEGACY_IDLE),
775 	SYSC_QUIRK("mmu", 0, 0, 0x10, 0x14, 0x00000030, 0xffffffff,
776 		   SYSC_QUIRK_LEGACY_IDLE),
777 	SYSC_QUIRK("sham", 0, 0x100, 0x110, 0x114, 0x40000c03, 0xffffffff,
778 		   SYSC_QUIRK_LEGACY_IDLE),
779 	SYSC_QUIRK("smartreflex", 0, -1, 0x24, -1, 0x00000000, 0xffffffff,
780 		   SYSC_QUIRK_LEGACY_IDLE),
781 	SYSC_QUIRK("smartreflex", 0, -1, 0x38, -1, 0x00000000, 0xffffffff,
782 		   SYSC_QUIRK_LEGACY_IDLE),
783 	SYSC_QUIRK("timer", 0, 0, 0x10, 0x14, 0x00000015, 0xffffffff,
784 		   0),
785 	/* Some timers on omap4 and later */
786 	SYSC_QUIRK("timer", 0, 0, 0x10, -1, 0x50002100, 0xffffffff,
787 		   0),
788 	SYSC_QUIRK("timer", 0, 0, 0x10, -1, 0x4fff1301, 0xffff00ff,
789 		   0),
790 	SYSC_QUIRK("uart", 0, 0x50, 0x54, 0x58, 0x00000052, 0xffffffff,
791 		   SYSC_QUIRK_LEGACY_IDLE),
792 	/* Uarts on omap4 and later */
793 	SYSC_QUIRK("uart", 0, 0x50, 0x54, 0x58, 0x50411e03, 0xffff00ff,
794 		   SYSC_QUIRK_LEGACY_IDLE),
795 	SYSC_QUIRK("uart", 0, 0x50, 0x54, 0x58, 0x47422e03, 0xffffffff,
796 		   SYSC_QUIRK_LEGACY_IDLE),
797 
798 #ifdef DEBUG
799 	SYSC_QUIRK("adc", 0, 0, 0x10, -1, 0x47300001, 0xffffffff, 0),
800 	SYSC_QUIRK("atl", 0, 0, -1, -1, 0x0a070100, 0xffffffff, 0),
801 	SYSC_QUIRK("aess", 0, 0, 0x10, -1, 0x40000000, 0xffffffff, 0),
802 	SYSC_QUIRK("cm", 0, 0, -1, -1, 0x40000301, 0xffffffff, 0),
803 	SYSC_QUIRK("control", 0, 0, 0x10, -1, 0x40000900, 0xffffffff, 0),
804 	SYSC_QUIRK("cpgmac", 0, 0x1200, 0x1208, 0x1204, 0x4edb1902,
805 		   0xffff00f0, 0),
806 	SYSC_QUIRK("dcan", 0, 0, -1, -1, 0xffffffff, 0xffffffff, 0),
807 	SYSC_QUIRK("dcan", 0, 0, -1, -1, 0x00001401, 0xffffffff, 0),
808 	SYSC_QUIRK("dwc3", 0, 0, 0x10, -1, 0x500a0200, 0xffffffff, 0),
809 	SYSC_QUIRK("epwmss", 0, 0, 0x4, -1, 0x47400001, 0xffffffff, 0),
810 	SYSC_QUIRK("gpu", 0, 0x1fc00, 0x1fc10, -1, 0, 0, 0),
811 	SYSC_QUIRK("hdq1w", 0, 0, 0x14, 0x18, 0x00000006, 0xffffffff, 0),
812 	SYSC_QUIRK("hdq1w", 0, 0, 0x14, 0x18, 0x0000000a, 0xffffffff, 0),
813 	SYSC_QUIRK("hsi", 0, 0, 0x10, 0x14, 0x50043101, 0xffffffff, 0),
814 	SYSC_QUIRK("iss", 0, 0, 0x10, -1, 0x40000101, 0xffffffff, 0),
815 	SYSC_QUIRK("i2c", 0, 0, 0x10, 0x90, 0x5040000a, 0xfffff0f0, 0),
816 	SYSC_QUIRK("lcdc", 0, 0, 0x54, -1, 0x4f201000, 0xffffffff, 0),
817 	SYSC_QUIRK("mcasp", 0, 0, 0x4, -1, 0x44306302, 0xffffffff, 0),
818 	SYSC_QUIRK("mcasp", 0, 0, 0x4, -1, 0x44307b02, 0xffffffff, 0),
819 	SYSC_QUIRK("mcbsp", 0, -1, 0x8c, -1, 0, 0, 0),
820 	SYSC_QUIRK("mcspi", 0, 0, 0x10, -1, 0x40300a0b, 0xffff00ff, 0),
821 	SYSC_QUIRK("mcspi", 0, 0, 0x110, 0x114, 0x40300a0b, 0xffffffff, 0),
822 	SYSC_QUIRK("mailbox", 0, 0, 0x10, -1, 0x00000400, 0xffffffff, 0),
823 	SYSC_QUIRK("m3", 0, 0, -1, -1, 0x5f580105, 0x0fff0f00, 0),
824 	SYSC_QUIRK("ocp2scp", 0, 0, 0x10, 0x14, 0x50060005, 0xfffffff0, 0),
825 	SYSC_QUIRK("ocp2scp", 0, 0, -1, -1, 0x50060007, 0xffffffff, 0),
826 	SYSC_QUIRK("padconf", 0, 0, 0x10, -1, 0x4fff0800, 0xffffffff, 0),
827 	SYSC_QUIRK("padconf", 0, 0, -1, -1, 0x40001100, 0xffffffff, 0),
828 	SYSC_QUIRK("prcm", 0, 0, -1, -1, 0x40000100, 0xffffffff, 0),
829 	SYSC_QUIRK("prcm", 0, 0, -1, -1, 0x00004102, 0xffffffff, 0),
830 	SYSC_QUIRK("prcm", 0, 0, -1, -1, 0x40000400, 0xffffffff, 0),
831 	SYSC_QUIRK("scm", 0, 0, 0x10, -1, 0x40000900, 0xffffffff, 0),
832 	SYSC_QUIRK("scm", 0, 0, -1, -1, 0x4e8b0100, 0xffffffff, 0),
833 	SYSC_QUIRK("scm", 0, 0, -1, -1, 0x4f000100, 0xffffffff, 0),
834 	SYSC_QUIRK("scm", 0, 0, -1, -1, 0x40000900, 0xffffffff, 0),
835 	SYSC_QUIRK("scrm", 0, 0, -1, -1, 0x00000010, 0xffffffff, 0),
836 	SYSC_QUIRK("sdio", 0, 0, 0x10, -1, 0x40202301, 0xffff0ff0, 0),
837 	SYSC_QUIRK("sdio", 0, 0x2fc, 0x110, 0x114, 0x31010000, 0xffffffff, 0),
838 	SYSC_QUIRK("sdma", 0, 0, 0x2c, 0x28, 0x00010900, 0xffffffff, 0),
839 	SYSC_QUIRK("slimbus", 0, 0, 0x10, -1, 0x40000902, 0xffffffff, 0),
840 	SYSC_QUIRK("slimbus", 0, 0, 0x10, -1, 0x40002903, 0xffffffff, 0),
841 	SYSC_QUIRK("spinlock", 0, 0, 0x10, -1, 0x50020000, 0xffffffff, 0),
842 	SYSC_QUIRK("rng", 0, 0x1fe0, 0x1fe4, -1, 0x00000020, 0xffffffff, 0),
843 	SYSC_QUIRK("rtc", 0, 0x74, 0x78, -1, 0x4eb01908, 0xffff00f0, 0),
844 	SYSC_QUIRK("timer32k", 0, 0, 0x4, -1, 0x00000060, 0xffffffff, 0),
845 	SYSC_QUIRK("usbhstll", 0, 0, 0x10, 0x14, 0x00000004, 0xffffffff, 0),
846 	SYSC_QUIRK("usbhstll", 0, 0, 0x10, 0x14, 0x00000008, 0xffffffff, 0),
847 	SYSC_QUIRK("usb_host_hs", 0, 0, 0x10, 0x14, 0x50700100, 0xffffffff, 0),
848 	SYSC_QUIRK("usb_host_hs", 0, 0, 0x10, -1, 0x50700101, 0xffffffff, 0),
849 	SYSC_QUIRK("usb_otg_hs", 0, 0x400, 0x404, 0x408, 0x00000050,
850 		   0xffffffff, 0),
851 	SYSC_QUIRK("wdt", 0, 0, 0x10, 0x14, 0x502a0500, 0xfffff0f0, 0),
852 	SYSC_QUIRK("vfpe", 0, 0, 0x104, -1, 0x4d001200, 0xffffffff, 0),
853 #endif
854 };
855 
856 static void sysc_init_revision_quirks(struct sysc *ddata)
857 {
858 	const struct sysc_revision_quirk *q;
859 	int i;
860 
861 	for (i = 0; i < ARRAY_SIZE(sysc_revision_quirks); i++) {
862 		q = &sysc_revision_quirks[i];
863 
864 		if (q->base && q->base != ddata->module_pa)
865 			continue;
866 
867 		if (q->rev_offset >= 0 &&
868 		    q->rev_offset != ddata->offsets[SYSC_REVISION])
869 			continue;
870 
871 		if (q->sysc_offset >= 0 &&
872 		    q->sysc_offset != ddata->offsets[SYSC_SYSCONFIG])
873 			continue;
874 
875 		if (q->syss_offset >= 0 &&
876 		    q->syss_offset != ddata->offsets[SYSC_SYSSTATUS])
877 			continue;
878 
879 		if (q->revision == ddata->revision ||
880 		    (q->revision & q->revision_mask) ==
881 		    (ddata->revision & q->revision_mask)) {
882 			ddata->name = q->name;
883 			ddata->cfg.quirks |= q->quirks;
884 		}
885 	}
886 }
887 
888 static int sysc_reset(struct sysc *ddata)
889 {
890 	int offset = ddata->offsets[SYSC_SYSCONFIG];
891 	int val;
892 
893 	if (ddata->legacy_mode || offset < 0 ||
894 	    ddata->cfg.quirks & SYSC_QUIRK_NO_RESET_ON_INIT)
895 		return 0;
896 
897 	/*
898 	 * Currently only support reset status in sysstatus.
899 	 * Warn and return error in all other cases
900 	 */
901 	if (!ddata->cfg.syss_mask) {
902 		dev_err(ddata->dev, "No ti,syss-mask. Reset failed\n");
903 		return -EINVAL;
904 	}
905 
906 	val = sysc_read(ddata, offset);
907 	val |= (0x1 << ddata->cap->regbits->srst_shift);
908 	sysc_write(ddata, offset, val);
909 
910 	/* Poll on reset status */
911 	offset = ddata->offsets[SYSC_SYSSTATUS];
912 
913 	return readl_poll_timeout(ddata->module_va + offset, val,
914 				  (val & ddata->cfg.syss_mask) == 0x0,
915 				  100, MAX_MODULE_SOFTRESET_WAIT);
916 }
917 
918 /* At this point the module is configured enough to read the revision */
919 static int sysc_init_module(struct sysc *ddata)
920 {
921 	int error;
922 
923 	if (ddata->cfg.quirks & SYSC_QUIRK_NO_IDLE_ON_INIT) {
924 		ddata->revision = sysc_read_revision(ddata);
925 		goto rev_quirks;
926 	}
927 
928 	error = pm_runtime_get_sync(ddata->dev);
929 	if (error < 0) {
930 		pm_runtime_put_noidle(ddata->dev);
931 
932 		return 0;
933 	}
934 
935 	error = sysc_reset(ddata);
936 	if (error) {
937 		dev_err(ddata->dev, "Reset failed with %d\n", error);
938 		pm_runtime_put_sync(ddata->dev);
939 
940 		return error;
941 	}
942 
943 	ddata->revision = sysc_read_revision(ddata);
944 	pm_runtime_put_sync(ddata->dev);
945 
946 rev_quirks:
947 	sysc_init_revision_quirks(ddata);
948 
949 	return 0;
950 }
951 
952 static int sysc_init_sysc_mask(struct sysc *ddata)
953 {
954 	struct device_node *np = ddata->dev->of_node;
955 	int error;
956 	u32 val;
957 
958 	error = of_property_read_u32(np, "ti,sysc-mask", &val);
959 	if (error)
960 		return 0;
961 
962 	if (val)
963 		ddata->cfg.sysc_val = val & ddata->cap->sysc_mask;
964 	else
965 		ddata->cfg.sysc_val = ddata->cap->sysc_mask;
966 
967 	return 0;
968 }
969 
970 static int sysc_init_idlemode(struct sysc *ddata, u8 *idlemodes,
971 			      const char *name)
972 {
973 	struct device_node *np = ddata->dev->of_node;
974 	struct property *prop;
975 	const __be32 *p;
976 	u32 val;
977 
978 	of_property_for_each_u32(np, name, prop, p, val) {
979 		if (val >= SYSC_NR_IDLEMODES) {
980 			dev_err(ddata->dev, "invalid idlemode: %i\n", val);
981 			return -EINVAL;
982 		}
983 		*idlemodes |=  (1 << val);
984 	}
985 
986 	return 0;
987 }
988 
989 static int sysc_init_idlemodes(struct sysc *ddata)
990 {
991 	int error;
992 
993 	error = sysc_init_idlemode(ddata, &ddata->cfg.midlemodes,
994 				   "ti,sysc-midle");
995 	if (error)
996 		return error;
997 
998 	error = sysc_init_idlemode(ddata, &ddata->cfg.sidlemodes,
999 				   "ti,sysc-sidle");
1000 	if (error)
1001 		return error;
1002 
1003 	return 0;
1004 }
1005 
1006 /*
1007  * Only some devices on omap4 and later have SYSCONFIG reset done
1008  * bit. We can detect this if there is no SYSSTATUS at all, or the
1009  * SYSTATUS bit 0 is not used. Note that some SYSSTATUS registers
1010  * have multiple bits for the child devices like OHCI and EHCI.
1011  * Depends on SYSC being parsed first.
1012  */
1013 static int sysc_init_syss_mask(struct sysc *ddata)
1014 {
1015 	struct device_node *np = ddata->dev->of_node;
1016 	int error;
1017 	u32 val;
1018 
1019 	error = of_property_read_u32(np, "ti,syss-mask", &val);
1020 	if (error) {
1021 		if ((ddata->cap->type == TI_SYSC_OMAP4 ||
1022 		     ddata->cap->type == TI_SYSC_OMAP4_TIMER) &&
1023 		    (ddata->cfg.sysc_val & SYSC_OMAP4_SOFTRESET))
1024 			ddata->cfg.quirks |= SYSC_QUIRK_RESET_STATUS;
1025 
1026 		return 0;
1027 	}
1028 
1029 	if (!(val & 1) && (ddata->cfg.sysc_val & SYSC_OMAP4_SOFTRESET))
1030 		ddata->cfg.quirks |= SYSC_QUIRK_RESET_STATUS;
1031 
1032 	ddata->cfg.syss_mask = val;
1033 
1034 	return 0;
1035 }
1036 
1037 /*
1038  * Many child device drivers need to have fck and opt clocks available
1039  * to get the clock rate for device internal configuration etc.
1040  */
1041 static int sysc_child_add_named_clock(struct sysc *ddata,
1042 				      struct device *child,
1043 				      const char *name)
1044 {
1045 	struct clk *clk;
1046 	struct clk_lookup *l;
1047 	int error = 0;
1048 
1049 	if (!name)
1050 		return 0;
1051 
1052 	clk = clk_get(child, name);
1053 	if (!IS_ERR(clk)) {
1054 		clk_put(clk);
1055 
1056 		return -EEXIST;
1057 	}
1058 
1059 	clk = clk_get(ddata->dev, name);
1060 	if (IS_ERR(clk))
1061 		return -ENODEV;
1062 
1063 	l = clkdev_create(clk, name, dev_name(child));
1064 	if (!l)
1065 		error = -ENOMEM;
1066 
1067 	clk_put(clk);
1068 
1069 	return error;
1070 }
1071 
1072 static int sysc_child_add_clocks(struct sysc *ddata,
1073 				 struct device *child)
1074 {
1075 	int i, error;
1076 
1077 	for (i = 0; i < ddata->nr_clocks; i++) {
1078 		error = sysc_child_add_named_clock(ddata,
1079 						   child,
1080 						   ddata->clock_roles[i]);
1081 		if (error && error != -EEXIST) {
1082 			dev_err(ddata->dev, "could not add child clock %s: %i\n",
1083 				ddata->clock_roles[i], error);
1084 
1085 			return error;
1086 		}
1087 	}
1088 
1089 	return 0;
1090 }
1091 
1092 static struct device_type sysc_device_type = {
1093 };
1094 
1095 static struct sysc *sysc_child_to_parent(struct device *dev)
1096 {
1097 	struct device *parent = dev->parent;
1098 
1099 	if (!parent || parent->type != &sysc_device_type)
1100 		return NULL;
1101 
1102 	return dev_get_drvdata(parent);
1103 }
1104 
1105 static int __maybe_unused sysc_child_runtime_suspend(struct device *dev)
1106 {
1107 	struct sysc *ddata;
1108 	int error;
1109 
1110 	ddata = sysc_child_to_parent(dev);
1111 
1112 	error = pm_generic_runtime_suspend(dev);
1113 	if (error)
1114 		return error;
1115 
1116 	if (!ddata->enabled)
1117 		return 0;
1118 
1119 	return sysc_runtime_suspend(ddata->dev);
1120 }
1121 
1122 static int __maybe_unused sysc_child_runtime_resume(struct device *dev)
1123 {
1124 	struct sysc *ddata;
1125 	int error;
1126 
1127 	ddata = sysc_child_to_parent(dev);
1128 
1129 	if (!ddata->enabled) {
1130 		error = sysc_runtime_resume(ddata->dev);
1131 		if (error < 0)
1132 			dev_err(ddata->dev,
1133 				"%s error: %i\n", __func__, error);
1134 	}
1135 
1136 	return pm_generic_runtime_resume(dev);
1137 }
1138 
1139 #ifdef CONFIG_PM_SLEEP
1140 static int sysc_child_suspend_noirq(struct device *dev)
1141 {
1142 	struct sysc *ddata;
1143 	int error;
1144 
1145 	ddata = sysc_child_to_parent(dev);
1146 
1147 	dev_dbg(ddata->dev, "%s %s\n", __func__,
1148 		ddata->name ? ddata->name : "");
1149 
1150 	error = pm_generic_suspend_noirq(dev);
1151 	if (error) {
1152 		dev_err(dev, "%s error at %i: %i\n",
1153 			__func__, __LINE__, error);
1154 
1155 		return error;
1156 	}
1157 
1158 	if (!pm_runtime_status_suspended(dev)) {
1159 		error = pm_generic_runtime_suspend(dev);
1160 		if (error) {
1161 			dev_dbg(dev, "%s busy at %i: %i\n",
1162 				__func__, __LINE__, error);
1163 
1164 			return 0;
1165 		}
1166 
1167 		error = sysc_runtime_suspend(ddata->dev);
1168 		if (error) {
1169 			dev_err(dev, "%s error at %i: %i\n",
1170 				__func__, __LINE__, error);
1171 
1172 			return error;
1173 		}
1174 
1175 		ddata->child_needs_resume = true;
1176 	}
1177 
1178 	return 0;
1179 }
1180 
1181 static int sysc_child_resume_noirq(struct device *dev)
1182 {
1183 	struct sysc *ddata;
1184 	int error;
1185 
1186 	ddata = sysc_child_to_parent(dev);
1187 
1188 	dev_dbg(ddata->dev, "%s %s\n", __func__,
1189 		ddata->name ? ddata->name : "");
1190 
1191 	if (ddata->child_needs_resume) {
1192 		ddata->child_needs_resume = false;
1193 
1194 		error = sysc_runtime_resume(ddata->dev);
1195 		if (error)
1196 			dev_err(ddata->dev,
1197 				"%s runtime resume error: %i\n",
1198 				__func__, error);
1199 
1200 		error = pm_generic_runtime_resume(dev);
1201 		if (error)
1202 			dev_err(ddata->dev,
1203 				"%s generic runtime resume: %i\n",
1204 				__func__, error);
1205 	}
1206 
1207 	return pm_generic_resume_noirq(dev);
1208 }
1209 #endif
1210 
1211 struct dev_pm_domain sysc_child_pm_domain = {
1212 	.ops = {
1213 		SET_RUNTIME_PM_OPS(sysc_child_runtime_suspend,
1214 				   sysc_child_runtime_resume,
1215 				   NULL)
1216 		USE_PLATFORM_PM_SLEEP_OPS
1217 		SET_NOIRQ_SYSTEM_SLEEP_PM_OPS(sysc_child_suspend_noirq,
1218 					      sysc_child_resume_noirq)
1219 	}
1220 };
1221 
1222 /**
1223  * sysc_legacy_idle_quirk - handle children in omap_device compatible way
1224  * @ddata: device driver data
1225  * @child: child device driver
1226  *
1227  * Allow idle for child devices as done with _od_runtime_suspend().
1228  * Otherwise many child devices will not idle because of the permanent
1229  * parent usecount set in pm_runtime_irq_safe().
1230  *
1231  * Note that the long term solution is to just modify the child device
1232  * drivers to not set pm_runtime_irq_safe() and then this can be just
1233  * dropped.
1234  */
1235 static void sysc_legacy_idle_quirk(struct sysc *ddata, struct device *child)
1236 {
1237 	if (!ddata->legacy_mode)
1238 		return;
1239 
1240 	if (ddata->cfg.quirks & SYSC_QUIRK_LEGACY_IDLE)
1241 		dev_pm_domain_set(child, &sysc_child_pm_domain);
1242 }
1243 
1244 static int sysc_notifier_call(struct notifier_block *nb,
1245 			      unsigned long event, void *device)
1246 {
1247 	struct device *dev = device;
1248 	struct sysc *ddata;
1249 	int error;
1250 
1251 	ddata = sysc_child_to_parent(dev);
1252 	if (!ddata)
1253 		return NOTIFY_DONE;
1254 
1255 	switch (event) {
1256 	case BUS_NOTIFY_ADD_DEVICE:
1257 		error = sysc_child_add_clocks(ddata, dev);
1258 		if (error)
1259 			return error;
1260 		sysc_legacy_idle_quirk(ddata, dev);
1261 		break;
1262 	default:
1263 		break;
1264 	}
1265 
1266 	return NOTIFY_DONE;
1267 }
1268 
1269 static struct notifier_block sysc_nb = {
1270 	.notifier_call = sysc_notifier_call,
1271 };
1272 
1273 /* Device tree configured quirks */
1274 struct sysc_dts_quirk {
1275 	const char *name;
1276 	u32 mask;
1277 };
1278 
1279 static const struct sysc_dts_quirk sysc_dts_quirks[] = {
1280 	{ .name = "ti,no-idle-on-init",
1281 	  .mask = SYSC_QUIRK_NO_IDLE_ON_INIT, },
1282 	{ .name = "ti,no-reset-on-init",
1283 	  .mask = SYSC_QUIRK_NO_RESET_ON_INIT, },
1284 };
1285 
1286 static void sysc_parse_dts_quirks(struct sysc *ddata, struct device_node *np,
1287 				  bool is_child)
1288 {
1289 	const struct property *prop;
1290 	int i, len;
1291 
1292 	for (i = 0; i < ARRAY_SIZE(sysc_dts_quirks); i++) {
1293 		const char *name = sysc_dts_quirks[i].name;
1294 
1295 		prop = of_get_property(np, name, &len);
1296 		if (!prop)
1297 			continue;
1298 
1299 		ddata->cfg.quirks |= sysc_dts_quirks[i].mask;
1300 		if (is_child) {
1301 			dev_warn(ddata->dev,
1302 				 "dts flag should be at module level for %s\n",
1303 				 name);
1304 		}
1305 	}
1306 }
1307 
1308 static int sysc_init_dts_quirks(struct sysc *ddata)
1309 {
1310 	struct device_node *np = ddata->dev->of_node;
1311 	int error;
1312 	u32 val;
1313 
1314 	ddata->legacy_mode = of_get_property(np, "ti,hwmods", NULL);
1315 
1316 	sysc_parse_dts_quirks(ddata, np, false);
1317 	error = of_property_read_u32(np, "ti,sysc-delay-us", &val);
1318 	if (!error) {
1319 		if (val > 255) {
1320 			dev_warn(ddata->dev, "bad ti,sysc-delay-us: %i\n",
1321 				 val);
1322 		}
1323 
1324 		ddata->cfg.srst_udelay = (u8)val;
1325 	}
1326 
1327 	return 0;
1328 }
1329 
1330 static void sysc_unprepare(struct sysc *ddata)
1331 {
1332 	int i;
1333 
1334 	for (i = 0; i < SYSC_MAX_CLOCKS; i++) {
1335 		if (!IS_ERR_OR_NULL(ddata->clocks[i]))
1336 			clk_unprepare(ddata->clocks[i]);
1337 	}
1338 }
1339 
1340 /*
1341  * Common sysc register bits found on omap2, also known as type1
1342  */
1343 static const struct sysc_regbits sysc_regbits_omap2 = {
1344 	.dmadisable_shift = -ENODEV,
1345 	.midle_shift = 12,
1346 	.sidle_shift = 3,
1347 	.clkact_shift = 8,
1348 	.emufree_shift = 5,
1349 	.enwkup_shift = 2,
1350 	.srst_shift = 1,
1351 	.autoidle_shift = 0,
1352 };
1353 
1354 static const struct sysc_capabilities sysc_omap2 = {
1355 	.type = TI_SYSC_OMAP2,
1356 	.sysc_mask = SYSC_OMAP2_CLOCKACTIVITY | SYSC_OMAP2_EMUFREE |
1357 		     SYSC_OMAP2_ENAWAKEUP | SYSC_OMAP2_SOFTRESET |
1358 		     SYSC_OMAP2_AUTOIDLE,
1359 	.regbits = &sysc_regbits_omap2,
1360 };
1361 
1362 /* All omap2 and 3 timers, and timers 1, 2 & 10 on omap 4 and 5 */
1363 static const struct sysc_capabilities sysc_omap2_timer = {
1364 	.type = TI_SYSC_OMAP2_TIMER,
1365 	.sysc_mask = SYSC_OMAP2_CLOCKACTIVITY | SYSC_OMAP2_EMUFREE |
1366 		     SYSC_OMAP2_ENAWAKEUP | SYSC_OMAP2_SOFTRESET |
1367 		     SYSC_OMAP2_AUTOIDLE,
1368 	.regbits = &sysc_regbits_omap2,
1369 	.mod_quirks = SYSC_QUIRK_USE_CLOCKACT,
1370 };
1371 
1372 /*
1373  * SHAM2 (SHA1/MD5) sysc found on omap3, a variant of sysc_regbits_omap2
1374  * with different sidle position
1375  */
1376 static const struct sysc_regbits sysc_regbits_omap3_sham = {
1377 	.dmadisable_shift = -ENODEV,
1378 	.midle_shift = -ENODEV,
1379 	.sidle_shift = 4,
1380 	.clkact_shift = -ENODEV,
1381 	.enwkup_shift = -ENODEV,
1382 	.srst_shift = 1,
1383 	.autoidle_shift = 0,
1384 	.emufree_shift = -ENODEV,
1385 };
1386 
1387 static const struct sysc_capabilities sysc_omap3_sham = {
1388 	.type = TI_SYSC_OMAP3_SHAM,
1389 	.sysc_mask = SYSC_OMAP2_SOFTRESET | SYSC_OMAP2_AUTOIDLE,
1390 	.regbits = &sysc_regbits_omap3_sham,
1391 };
1392 
1393 /*
1394  * AES register bits found on omap3 and later, a variant of
1395  * sysc_regbits_omap2 with different sidle position
1396  */
1397 static const struct sysc_regbits sysc_regbits_omap3_aes = {
1398 	.dmadisable_shift = -ENODEV,
1399 	.midle_shift = -ENODEV,
1400 	.sidle_shift = 6,
1401 	.clkact_shift = -ENODEV,
1402 	.enwkup_shift = -ENODEV,
1403 	.srst_shift = 1,
1404 	.autoidle_shift = 0,
1405 	.emufree_shift = -ENODEV,
1406 };
1407 
1408 static const struct sysc_capabilities sysc_omap3_aes = {
1409 	.type = TI_SYSC_OMAP3_AES,
1410 	.sysc_mask = SYSC_OMAP2_SOFTRESET | SYSC_OMAP2_AUTOIDLE,
1411 	.regbits = &sysc_regbits_omap3_aes,
1412 };
1413 
1414 /*
1415  * Common sysc register bits found on omap4, also known as type2
1416  */
1417 static const struct sysc_regbits sysc_regbits_omap4 = {
1418 	.dmadisable_shift = 16,
1419 	.midle_shift = 4,
1420 	.sidle_shift = 2,
1421 	.clkact_shift = -ENODEV,
1422 	.enwkup_shift = -ENODEV,
1423 	.emufree_shift = 1,
1424 	.srst_shift = 0,
1425 	.autoidle_shift = -ENODEV,
1426 };
1427 
1428 static const struct sysc_capabilities sysc_omap4 = {
1429 	.type = TI_SYSC_OMAP4,
1430 	.sysc_mask = SYSC_OMAP4_DMADISABLE | SYSC_OMAP4_FREEEMU |
1431 		     SYSC_OMAP4_SOFTRESET,
1432 	.regbits = &sysc_regbits_omap4,
1433 };
1434 
1435 static const struct sysc_capabilities sysc_omap4_timer = {
1436 	.type = TI_SYSC_OMAP4_TIMER,
1437 	.sysc_mask = SYSC_OMAP4_DMADISABLE | SYSC_OMAP4_FREEEMU |
1438 		     SYSC_OMAP4_SOFTRESET,
1439 	.regbits = &sysc_regbits_omap4,
1440 };
1441 
1442 /*
1443  * Common sysc register bits found on omap4, also known as type3
1444  */
1445 static const struct sysc_regbits sysc_regbits_omap4_simple = {
1446 	.dmadisable_shift = -ENODEV,
1447 	.midle_shift = 2,
1448 	.sidle_shift = 0,
1449 	.clkact_shift = -ENODEV,
1450 	.enwkup_shift = -ENODEV,
1451 	.srst_shift = -ENODEV,
1452 	.emufree_shift = -ENODEV,
1453 	.autoidle_shift = -ENODEV,
1454 };
1455 
1456 static const struct sysc_capabilities sysc_omap4_simple = {
1457 	.type = TI_SYSC_OMAP4_SIMPLE,
1458 	.regbits = &sysc_regbits_omap4_simple,
1459 };
1460 
1461 /*
1462  * SmartReflex sysc found on omap34xx
1463  */
1464 static const struct sysc_regbits sysc_regbits_omap34xx_sr = {
1465 	.dmadisable_shift = -ENODEV,
1466 	.midle_shift = -ENODEV,
1467 	.sidle_shift = -ENODEV,
1468 	.clkact_shift = 20,
1469 	.enwkup_shift = -ENODEV,
1470 	.srst_shift = -ENODEV,
1471 	.emufree_shift = -ENODEV,
1472 	.autoidle_shift = -ENODEV,
1473 };
1474 
1475 static const struct sysc_capabilities sysc_34xx_sr = {
1476 	.type = TI_SYSC_OMAP34XX_SR,
1477 	.sysc_mask = SYSC_OMAP2_CLOCKACTIVITY,
1478 	.regbits = &sysc_regbits_omap34xx_sr,
1479 	.mod_quirks = SYSC_QUIRK_USE_CLOCKACT | SYSC_QUIRK_UNCACHED |
1480 		      SYSC_QUIRK_LEGACY_IDLE,
1481 };
1482 
1483 /*
1484  * SmartReflex sysc found on omap36xx and later
1485  */
1486 static const struct sysc_regbits sysc_regbits_omap36xx_sr = {
1487 	.dmadisable_shift = -ENODEV,
1488 	.midle_shift = -ENODEV,
1489 	.sidle_shift = 24,
1490 	.clkact_shift = -ENODEV,
1491 	.enwkup_shift = 26,
1492 	.srst_shift = -ENODEV,
1493 	.emufree_shift = -ENODEV,
1494 	.autoidle_shift = -ENODEV,
1495 };
1496 
1497 static const struct sysc_capabilities sysc_36xx_sr = {
1498 	.type = TI_SYSC_OMAP36XX_SR,
1499 	.sysc_mask = SYSC_OMAP3_SR_ENAWAKEUP,
1500 	.regbits = &sysc_regbits_omap36xx_sr,
1501 	.mod_quirks = SYSC_QUIRK_UNCACHED | SYSC_QUIRK_LEGACY_IDLE,
1502 };
1503 
1504 static const struct sysc_capabilities sysc_omap4_sr = {
1505 	.type = TI_SYSC_OMAP4_SR,
1506 	.regbits = &sysc_regbits_omap36xx_sr,
1507 	.mod_quirks = SYSC_QUIRK_LEGACY_IDLE,
1508 };
1509 
1510 /*
1511  * McASP register bits found on omap4 and later
1512  */
1513 static const struct sysc_regbits sysc_regbits_omap4_mcasp = {
1514 	.dmadisable_shift = -ENODEV,
1515 	.midle_shift = -ENODEV,
1516 	.sidle_shift = 0,
1517 	.clkact_shift = -ENODEV,
1518 	.enwkup_shift = -ENODEV,
1519 	.srst_shift = -ENODEV,
1520 	.emufree_shift = -ENODEV,
1521 	.autoidle_shift = -ENODEV,
1522 };
1523 
1524 static const struct sysc_capabilities sysc_omap4_mcasp = {
1525 	.type = TI_SYSC_OMAP4_MCASP,
1526 	.regbits = &sysc_regbits_omap4_mcasp,
1527 	.mod_quirks = SYSC_QUIRK_OPT_CLKS_NEEDED,
1528 };
1529 
1530 /*
1531  * McASP found on dra7 and later
1532  */
1533 static const struct sysc_capabilities sysc_dra7_mcasp = {
1534 	.type = TI_SYSC_OMAP4_SIMPLE,
1535 	.regbits = &sysc_regbits_omap4_simple,
1536 	.mod_quirks = SYSC_QUIRK_OPT_CLKS_NEEDED,
1537 };
1538 
1539 /*
1540  * FS USB host found on omap4 and later
1541  */
1542 static const struct sysc_regbits sysc_regbits_omap4_usb_host_fs = {
1543 	.dmadisable_shift = -ENODEV,
1544 	.midle_shift = -ENODEV,
1545 	.sidle_shift = 24,
1546 	.clkact_shift = -ENODEV,
1547 	.enwkup_shift = 26,
1548 	.srst_shift = -ENODEV,
1549 	.emufree_shift = -ENODEV,
1550 	.autoidle_shift = -ENODEV,
1551 };
1552 
1553 static const struct sysc_capabilities sysc_omap4_usb_host_fs = {
1554 	.type = TI_SYSC_OMAP4_USB_HOST_FS,
1555 	.sysc_mask = SYSC_OMAP2_ENAWAKEUP,
1556 	.regbits = &sysc_regbits_omap4_usb_host_fs,
1557 };
1558 
1559 static const struct sysc_regbits sysc_regbits_dra7_mcan = {
1560 	.dmadisable_shift = -ENODEV,
1561 	.midle_shift = -ENODEV,
1562 	.sidle_shift = -ENODEV,
1563 	.clkact_shift = -ENODEV,
1564 	.enwkup_shift = 4,
1565 	.srst_shift = 0,
1566 	.emufree_shift = -ENODEV,
1567 	.autoidle_shift = -ENODEV,
1568 };
1569 
1570 static const struct sysc_capabilities sysc_dra7_mcan = {
1571 	.type = TI_SYSC_DRA7_MCAN,
1572 	.sysc_mask = SYSC_DRA7_MCAN_ENAWAKEUP | SYSC_OMAP4_SOFTRESET,
1573 	.regbits = &sysc_regbits_dra7_mcan,
1574 };
1575 
1576 static int sysc_init_pdata(struct sysc *ddata)
1577 {
1578 	struct ti_sysc_platform_data *pdata = dev_get_platdata(ddata->dev);
1579 	struct ti_sysc_module_data mdata;
1580 	int error = 0;
1581 
1582 	if (!pdata || !ddata->legacy_mode)
1583 		return 0;
1584 
1585 	mdata.name = ddata->legacy_mode;
1586 	mdata.module_pa = ddata->module_pa;
1587 	mdata.module_size = ddata->module_size;
1588 	mdata.offsets = ddata->offsets;
1589 	mdata.nr_offsets = SYSC_MAX_REGS;
1590 	mdata.cap = ddata->cap;
1591 	mdata.cfg = &ddata->cfg;
1592 
1593 	if (!pdata->init_module)
1594 		return -ENODEV;
1595 
1596 	error = pdata->init_module(ddata->dev, &mdata, &ddata->cookie);
1597 	if (error == -EEXIST)
1598 		error = 0;
1599 
1600 	return error;
1601 }
1602 
1603 static int sysc_init_match(struct sysc *ddata)
1604 {
1605 	const struct sysc_capabilities *cap;
1606 
1607 	cap = of_device_get_match_data(ddata->dev);
1608 	if (!cap)
1609 		return -EINVAL;
1610 
1611 	ddata->cap = cap;
1612 	if (ddata->cap)
1613 		ddata->cfg.quirks |= ddata->cap->mod_quirks;
1614 
1615 	return 0;
1616 }
1617 
1618 static void ti_sysc_idle(struct work_struct *work)
1619 {
1620 	struct sysc *ddata;
1621 
1622 	ddata = container_of(work, struct sysc, idle_work.work);
1623 
1624 	if (pm_runtime_active(ddata->dev))
1625 		pm_runtime_put_sync(ddata->dev);
1626 }
1627 
1628 static const struct of_device_id sysc_match_table[] = {
1629 	{ .compatible = "simple-bus", },
1630 	{ /* sentinel */ },
1631 };
1632 
1633 static int sysc_probe(struct platform_device *pdev)
1634 {
1635 	struct ti_sysc_platform_data *pdata = dev_get_platdata(&pdev->dev);
1636 	struct sysc *ddata;
1637 	int error;
1638 
1639 	ddata = devm_kzalloc(&pdev->dev, sizeof(*ddata), GFP_KERNEL);
1640 	if (!ddata)
1641 		return -ENOMEM;
1642 
1643 	ddata->dev = &pdev->dev;
1644 	platform_set_drvdata(pdev, ddata);
1645 
1646 	error = sysc_init_match(ddata);
1647 	if (error)
1648 		return error;
1649 
1650 	error = sysc_init_dts_quirks(ddata);
1651 	if (error)
1652 		goto unprepare;
1653 
1654 	error = sysc_get_clocks(ddata);
1655 	if (error)
1656 		return error;
1657 
1658 	error = sysc_map_and_check_registers(ddata);
1659 	if (error)
1660 		goto unprepare;
1661 
1662 	error = sysc_init_sysc_mask(ddata);
1663 	if (error)
1664 		goto unprepare;
1665 
1666 	error = sysc_init_idlemodes(ddata);
1667 	if (error)
1668 		goto unprepare;
1669 
1670 	error = sysc_init_syss_mask(ddata);
1671 	if (error)
1672 		goto unprepare;
1673 
1674 	error = sysc_init_pdata(ddata);
1675 	if (error)
1676 		goto unprepare;
1677 
1678 	error = sysc_init_resets(ddata);
1679 	if (error)
1680 		return error;
1681 
1682 	pm_runtime_enable(ddata->dev);
1683 	error = sysc_init_module(ddata);
1684 	if (error)
1685 		goto unprepare;
1686 
1687 	error = pm_runtime_get_sync(ddata->dev);
1688 	if (error < 0) {
1689 		pm_runtime_put_noidle(ddata->dev);
1690 		pm_runtime_disable(ddata->dev);
1691 		goto unprepare;
1692 	}
1693 
1694 	sysc_show_registers(ddata);
1695 
1696 	ddata->dev->type = &sysc_device_type;
1697 	error = of_platform_populate(ddata->dev->of_node, sysc_match_table,
1698 				     pdata ? pdata->auxdata : NULL,
1699 				     ddata->dev);
1700 	if (error)
1701 		goto err;
1702 
1703 	INIT_DELAYED_WORK(&ddata->idle_work, ti_sysc_idle);
1704 
1705 	/* At least earlycon won't survive without deferred idle */
1706 	if (ddata->cfg.quirks & (SYSC_QUIRK_NO_IDLE_ON_INIT |
1707 				 SYSC_QUIRK_NO_RESET_ON_INIT)) {
1708 		schedule_delayed_work(&ddata->idle_work, 3000);
1709 	} else {
1710 		pm_runtime_put(&pdev->dev);
1711 	}
1712 
1713 	if (!of_get_available_child_count(ddata->dev->of_node))
1714 		reset_control_assert(ddata->rsts);
1715 
1716 	return 0;
1717 
1718 err:
1719 	pm_runtime_put_sync(&pdev->dev);
1720 	pm_runtime_disable(&pdev->dev);
1721 unprepare:
1722 	sysc_unprepare(ddata);
1723 
1724 	return error;
1725 }
1726 
1727 static int sysc_remove(struct platform_device *pdev)
1728 {
1729 	struct sysc *ddata = platform_get_drvdata(pdev);
1730 	int error;
1731 
1732 	cancel_delayed_work_sync(&ddata->idle_work);
1733 
1734 	error = pm_runtime_get_sync(ddata->dev);
1735 	if (error < 0) {
1736 		pm_runtime_put_noidle(ddata->dev);
1737 		pm_runtime_disable(ddata->dev);
1738 		goto unprepare;
1739 	}
1740 
1741 	of_platform_depopulate(&pdev->dev);
1742 
1743 	pm_runtime_put_sync(&pdev->dev);
1744 	pm_runtime_disable(&pdev->dev);
1745 	reset_control_assert(ddata->rsts);
1746 
1747 unprepare:
1748 	sysc_unprepare(ddata);
1749 
1750 	return 0;
1751 }
1752 
1753 static const struct of_device_id sysc_match[] = {
1754 	{ .compatible = "ti,sysc-omap2", .data = &sysc_omap2, },
1755 	{ .compatible = "ti,sysc-omap2-timer", .data = &sysc_omap2_timer, },
1756 	{ .compatible = "ti,sysc-omap4", .data = &sysc_omap4, },
1757 	{ .compatible = "ti,sysc-omap4-timer", .data = &sysc_omap4_timer, },
1758 	{ .compatible = "ti,sysc-omap4-simple", .data = &sysc_omap4_simple, },
1759 	{ .compatible = "ti,sysc-omap3430-sr", .data = &sysc_34xx_sr, },
1760 	{ .compatible = "ti,sysc-omap3630-sr", .data = &sysc_36xx_sr, },
1761 	{ .compatible = "ti,sysc-omap4-sr", .data = &sysc_omap4_sr, },
1762 	{ .compatible = "ti,sysc-omap3-sham", .data = &sysc_omap3_sham, },
1763 	{ .compatible = "ti,sysc-omap-aes", .data = &sysc_omap3_aes, },
1764 	{ .compatible = "ti,sysc-mcasp", .data = &sysc_omap4_mcasp, },
1765 	{ .compatible = "ti,sysc-dra7-mcasp", .data = &sysc_dra7_mcasp, },
1766 	{ .compatible = "ti,sysc-usb-host-fs",
1767 	  .data = &sysc_omap4_usb_host_fs, },
1768 	{ .compatible = "ti,sysc-dra7-mcan", .data = &sysc_dra7_mcan, },
1769 	{  },
1770 };
1771 MODULE_DEVICE_TABLE(of, sysc_match);
1772 
1773 static struct platform_driver sysc_driver = {
1774 	.probe		= sysc_probe,
1775 	.remove		= sysc_remove,
1776 	.driver         = {
1777 		.name   = "ti-sysc",
1778 		.of_match_table	= sysc_match,
1779 		.pm = &sysc_pm_ops,
1780 	},
1781 };
1782 
1783 static int __init sysc_init(void)
1784 {
1785 	bus_register_notifier(&platform_bus_type, &sysc_nb);
1786 
1787 	return platform_driver_register(&sysc_driver);
1788 }
1789 module_init(sysc_init);
1790 
1791 static void __exit sysc_exit(void)
1792 {
1793 	bus_unregister_notifier(&platform_bus_type, &sysc_nb);
1794 	platform_driver_unregister(&sysc_driver);
1795 }
1796 module_exit(sysc_exit);
1797 
1798 MODULE_DESCRIPTION("TI sysc interconnect target driver");
1799 MODULE_LICENSE("GPL v2");
1800