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1// SPDX-License-Identifier: GPL-2.0
2/*
3 * ti-sysc.c - Texas Instruments sysc interconnect target driver
4 */
5
6#include <linux/io.h>
7#include <linux/clk.h>
8#include <linux/clkdev.h>
9#include <linux/delay.h>
10#include <linux/module.h>
11#include <linux/platform_device.h>
12#include <linux/pm_domain.h>
13#include <linux/pm_runtime.h>
14#include <linux/reset.h>
15#include <linux/of_address.h>
16#include <linux/of_platform.h>
17#include <linux/slab.h>
18#include <linux/iopoll.h>
19
20#include <linux/platform_data/ti-sysc.h>
21
22#include <dt-bindings/bus/ti-sysc.h>
23
24#define MAX_MODULE_SOFTRESET_WAIT 10000
25
26static const char * const reg_names[] = { "rev", "sysc", "syss", };
27
28enum sysc_clocks {
29 SYSC_FCK,
30 SYSC_ICK,
31 SYSC_OPTFCK0,
32 SYSC_OPTFCK1,
33 SYSC_OPTFCK2,
34 SYSC_OPTFCK3,
35 SYSC_OPTFCK4,
36 SYSC_OPTFCK5,
37 SYSC_OPTFCK6,
38 SYSC_OPTFCK7,
39 SYSC_MAX_CLOCKS,
40};
41
42static const char * const clock_names[SYSC_MAX_CLOCKS] = {
43 "fck", "ick", "opt0", "opt1", "opt2", "opt3", "opt4",
44 "opt5", "opt6", "opt7",
45};
46
47#define SYSC_IDLEMODE_MASK 3
48#define SYSC_CLOCKACTIVITY_MASK 3
49
50/**
51 * struct sysc - TI sysc interconnect target module registers and capabilities
52 * @dev: struct device pointer
53 * @module_pa: physical address of the interconnect target module
54 * @module_size: size of the interconnect target module
55 * @module_va: virtual address of the interconnect target module
56 * @offsets: register offsets from module base
57 * @mdata: ti-sysc to hwmod translation data for a module
58 * @clocks: clocks used by the interconnect target module
59 * @clock_roles: clock role names for the found clocks
60 * @nr_clocks: number of clocks used by the interconnect target module
61 * @rsts: resets used by the interconnect target module
62 * @legacy_mode: configured for legacy mode if set
63 * @cap: interconnect target module capabilities
64 * @cfg: interconnect target module configuration
65 * @cookie: data used by legacy platform callbacks
66 * @name: name if available
67 * @revision: interconnect target module revision
68 * @enabled: sysc runtime enabled status
69 * @needs_resume: runtime resume needed on resume from suspend
70 * @child_needs_resume: runtime resume needed for child on resume from suspend
71 * @disable_on_idle: status flag used for disabling modules with resets
72 * @idle_work: work structure used to perform delayed idle on a module
73 * @clk_enable_quirk: module specific clock enable quirk
74 * @clk_disable_quirk: module specific clock disable quirk
75 * @reset_done_quirk: module specific reset done quirk
76 * @module_enable_quirk: module specific enable quirk
77 * @module_disable_quirk: module specific disable quirk
78 */
79struct sysc {
80 struct device *dev;
81 u64 module_pa;
82 u32 module_size;
83 void __iomem *module_va;
84 int offsets[SYSC_MAX_REGS];
85 struct ti_sysc_module_data *mdata;
86 struct clk **clocks;
87 const char **clock_roles;
88 int nr_clocks;
89 struct reset_control *rsts;
90 const char *legacy_mode;
91 const struct sysc_capabilities *cap;
92 struct sysc_config cfg;
93 struct ti_sysc_cookie cookie;
94 const char *name;
95 u32 revision;
96 unsigned int enabled:1;
97 unsigned int needs_resume:1;
98 unsigned int child_needs_resume:1;
99 struct delayed_work idle_work;
100 void (*clk_enable_quirk)(struct sysc *sysc);
101 void (*clk_disable_quirk)(struct sysc *sysc);
102 void (*reset_done_quirk)(struct sysc *sysc);
103 void (*module_enable_quirk)(struct sysc *sysc);
104 void (*module_disable_quirk)(struct sysc *sysc);
105};
106
107static void sysc_parse_dts_quirks(struct sysc *ddata, struct device_node *np,
108 bool is_child);
109
110static void sysc_write(struct sysc *ddata, int offset, u32 value)
111{
112 if (ddata->cfg.quirks & SYSC_QUIRK_16BIT) {
113 writew_relaxed(value & 0xffff, ddata->module_va + offset);
114
115 /* Only i2c revision has LO and HI register with stride of 4 */
116 if (ddata->offsets[SYSC_REVISION] >= 0 &&
117 offset == ddata->offsets[SYSC_REVISION]) {
118 u16 hi = value >> 16;
119
120 writew_relaxed(hi, ddata->module_va + offset + 4);
121 }
122
123 return;
124 }
125
126 writel_relaxed(value, ddata->module_va + offset);
127}
128
129static u32 sysc_read(struct sysc *ddata, int offset)
130{
131 if (ddata->cfg.quirks & SYSC_QUIRK_16BIT) {
132 u32 val;
133
134 val = readw_relaxed(ddata->module_va + offset);
135
136 /* Only i2c revision has LO and HI register with stride of 4 */
137 if (ddata->offsets[SYSC_REVISION] >= 0 &&
138 offset == ddata->offsets[SYSC_REVISION]) {
139 u16 tmp = readw_relaxed(ddata->module_va + offset + 4);
140
141 val |= tmp << 16;
142 }
143
144 return val;
145 }
146
147 return readl_relaxed(ddata->module_va + offset);
148}
149
150static bool sysc_opt_clks_needed(struct sysc *ddata)
151{
152 return !!(ddata->cfg.quirks & SYSC_QUIRK_OPT_CLKS_NEEDED);
153}
154
155static u32 sysc_read_revision(struct sysc *ddata)
156{
157 int offset = ddata->offsets[SYSC_REVISION];
158
159 if (offset < 0)
160 return 0;
161
162 return sysc_read(ddata, offset);
163}
164
165static u32 sysc_read_sysconfig(struct sysc *ddata)
166{
167 int offset = ddata->offsets[SYSC_SYSCONFIG];
168
169 if (offset < 0)
170 return 0;
171
172 return sysc_read(ddata, offset);
173}
174
175static u32 sysc_read_sysstatus(struct sysc *ddata)
176{
177 int offset = ddata->offsets[SYSC_SYSSTATUS];
178
179 if (offset < 0)
180 return 0;
181
182 return sysc_read(ddata, offset);
183}
184
185static int sysc_add_named_clock_from_child(struct sysc *ddata,
186 const char *name,
187 const char *optfck_name)
188{
189 struct device_node *np = ddata->dev->of_node;
190 struct device_node *child;
191 struct clk_lookup *cl;
192 struct clk *clock;
193 const char *n;
194
195 if (name)
196 n = name;
197 else
198 n = optfck_name;
199
200 /* Does the clock alias already exist? */
201 clock = of_clk_get_by_name(np, n);
202 if (!IS_ERR(clock)) {
203 clk_put(clock);
204
205 return 0;
206 }
207
208 child = of_get_next_available_child(np, NULL);
209 if (!child)
210 return -ENODEV;
211
212 clock = devm_get_clk_from_child(ddata->dev, child, name);
213 if (IS_ERR(clock))
214 return PTR_ERR(clock);
215
216 /*
217 * Use clkdev_add() instead of clkdev_alloc() to avoid the MAX_DEV_ID
218 * limit for clk_get(). If cl ever needs to be freed, it should be done
219 * with clkdev_drop().
220 */
221 cl = kcalloc(1, sizeof(*cl), GFP_KERNEL);
222 if (!cl)
223 return -ENOMEM;
224
225 cl->con_id = n;
226 cl->dev_id = dev_name(ddata->dev);
227 cl->clk = clock;
228 clkdev_add(cl);
229
230 clk_put(clock);
231
232 return 0;
233}
234
235static int sysc_init_ext_opt_clock(struct sysc *ddata, const char *name)
236{
237 const char *optfck_name;
238 int error, index;
239
240 if (ddata->nr_clocks < SYSC_OPTFCK0)
241 index = SYSC_OPTFCK0;
242 else
243 index = ddata->nr_clocks;
244
245 if (name)
246 optfck_name = name;
247 else
248 optfck_name = clock_names[index];
249
250 error = sysc_add_named_clock_from_child(ddata, name, optfck_name);
251 if (error)
252 return error;
253
254 ddata->clock_roles[index] = optfck_name;
255 ddata->nr_clocks++;
256
257 return 0;
258}
259
260static int sysc_get_one_clock(struct sysc *ddata, const char *name)
261{
262 int error, i, index = -ENODEV;
263
264 if (!strncmp(clock_names[SYSC_FCK], name, 3))
265 index = SYSC_FCK;
266 else if (!strncmp(clock_names[SYSC_ICK], name, 3))
267 index = SYSC_ICK;
268
269 if (index < 0) {
270 for (i = SYSC_OPTFCK0; i < SYSC_MAX_CLOCKS; i++) {
271 if (!ddata->clocks[i]) {
272 index = i;
273 break;
274 }
275 }
276 }
277
278 if (index < 0) {
279 dev_err(ddata->dev, "clock %s not added\n", name);
280 return index;
281 }
282
283 ddata->clocks[index] = devm_clk_get(ddata->dev, name);
284 if (IS_ERR(ddata->clocks[index])) {
285 dev_err(ddata->dev, "clock get error for %s: %li\n",
286 name, PTR_ERR(ddata->clocks[index]));
287
288 return PTR_ERR(ddata->clocks[index]);
289 }
290
291 error = clk_prepare(ddata->clocks[index]);
292 if (error) {
293 dev_err(ddata->dev, "clock prepare error for %s: %i\n",
294 name, error);
295
296 return error;
297 }
298
299 return 0;
300}
301
302static int sysc_get_clocks(struct sysc *ddata)
303{
304 struct device_node *np = ddata->dev->of_node;
305 struct property *prop;
306 const char *name;
307 int nr_fck = 0, nr_ick = 0, i, error = 0;
308
309 ddata->clock_roles = devm_kcalloc(ddata->dev,
310 SYSC_MAX_CLOCKS,
311 sizeof(*ddata->clock_roles),
312 GFP_KERNEL);
313 if (!ddata->clock_roles)
314 return -ENOMEM;
315
316 of_property_for_each_string(np, "clock-names", prop, name) {
317 if (!strncmp(clock_names[SYSC_FCK], name, 3))
318 nr_fck++;
319 if (!strncmp(clock_names[SYSC_ICK], name, 3))
320 nr_ick++;
321 ddata->clock_roles[ddata->nr_clocks] = name;
322 ddata->nr_clocks++;
323 }
324
325 if (ddata->nr_clocks < 1)
326 return 0;
327
328 if ((ddata->cfg.quirks & SYSC_QUIRK_EXT_OPT_CLOCK)) {
329 error = sysc_init_ext_opt_clock(ddata, NULL);
330 if (error)
331 return error;
332 }
333
334 if (ddata->nr_clocks > SYSC_MAX_CLOCKS) {
335 dev_err(ddata->dev, "too many clocks for %pOF\n", np);
336
337 return -EINVAL;
338 }
339
340 if (nr_fck > 1 || nr_ick > 1) {
341 dev_err(ddata->dev, "max one fck and ick for %pOF\n", np);
342
343 return -EINVAL;
344 }
345
346 ddata->clocks = devm_kcalloc(ddata->dev,
347 ddata->nr_clocks, sizeof(*ddata->clocks),
348 GFP_KERNEL);
349 if (!ddata->clocks)
350 return -ENOMEM;
351
352 for (i = 0; i < SYSC_MAX_CLOCKS; i++) {
353 const char *name = ddata->clock_roles[i];
354
355 if (!name)
356 continue;
357
358 error = sysc_get_one_clock(ddata, name);
359 if (error)
360 return error;
361 }
362
363 return 0;
364}
365
366static int sysc_enable_main_clocks(struct sysc *ddata)
367{
368 struct clk *clock;
369 int i, error;
370
371 if (!ddata->clocks)
372 return 0;
373
374 for (i = 0; i < SYSC_OPTFCK0; i++) {
375 clock = ddata->clocks[i];
376
377 /* Main clocks may not have ick */
378 if (IS_ERR_OR_NULL(clock))
379 continue;
380
381 error = clk_enable(clock);
382 if (error)
383 goto err_disable;
384 }
385
386 return 0;
387
388err_disable:
389 for (i--; i >= 0; i--) {
390 clock = ddata->clocks[i];
391
392 /* Main clocks may not have ick */
393 if (IS_ERR_OR_NULL(clock))
394 continue;
395
396 clk_disable(clock);
397 }
398
399 return error;
400}
401
402static void sysc_disable_main_clocks(struct sysc *ddata)
403{
404 struct clk *clock;
405 int i;
406
407 if (!ddata->clocks)
408 return;
409
410 for (i = 0; i < SYSC_OPTFCK0; i++) {
411 clock = ddata->clocks[i];
412 if (IS_ERR_OR_NULL(clock))
413 continue;
414
415 clk_disable(clock);
416 }
417}
418
419static int sysc_enable_opt_clocks(struct sysc *ddata)
420{
421 struct clk *clock;
422 int i, error;
423
424 if (!ddata->clocks)
425 return 0;
426
427 for (i = SYSC_OPTFCK0; i < SYSC_MAX_CLOCKS; i++) {
428 clock = ddata->clocks[i];
429
430 /* Assume no holes for opt clocks */
431 if (IS_ERR_OR_NULL(clock))
432 return 0;
433
434 error = clk_enable(clock);
435 if (error)
436 goto err_disable;
437 }
438
439 return 0;
440
441err_disable:
442 for (i--; i >= 0; i--) {
443 clock = ddata->clocks[i];
444 if (IS_ERR_OR_NULL(clock))
445 continue;
446
447 clk_disable(clock);
448 }
449
450 return error;
451}
452
453static void sysc_disable_opt_clocks(struct sysc *ddata)
454{
455 struct clk *clock;
456 int i;
457
458 if (!ddata->clocks)
459 return;
460
461 for (i = SYSC_OPTFCK0; i < SYSC_MAX_CLOCKS; i++) {
462 clock = ddata->clocks[i];
463
464 /* Assume no holes for opt clocks */
465 if (IS_ERR_OR_NULL(clock))
466 return;
467
468 clk_disable(clock);
469 }
470}
471
472static void sysc_clkdm_deny_idle(struct sysc *ddata)
473{
474 struct ti_sysc_platform_data *pdata;
475
476 if (ddata->legacy_mode)
477 return;
478
479 pdata = dev_get_platdata(ddata->dev);
480 if (pdata && pdata->clkdm_deny_idle)
481 pdata->clkdm_deny_idle(ddata->dev, &ddata->cookie);
482}
483
484static void sysc_clkdm_allow_idle(struct sysc *ddata)
485{
486 struct ti_sysc_platform_data *pdata;
487
488 if (ddata->legacy_mode)
489 return;
490
491 pdata = dev_get_platdata(ddata->dev);
492 if (pdata && pdata->clkdm_allow_idle)
493 pdata->clkdm_allow_idle(ddata->dev, &ddata->cookie);
494}
495
496/**
497 * sysc_init_resets - init rstctrl reset line if configured
498 * @ddata: device driver data
499 *
500 * See sysc_rstctrl_reset_deassert().
501 */
502static int sysc_init_resets(struct sysc *ddata)
503{
504 ddata->rsts =
505 devm_reset_control_get_optional_shared(ddata->dev, "rstctrl");
506 if (IS_ERR(ddata->rsts))
507 return PTR_ERR(ddata->rsts);
508
509 return 0;
510}
511
512/**
513 * sysc_parse_and_check_child_range - parses module IO region from ranges
514 * @ddata: device driver data
515 *
516 * In general we only need rev, syss, and sysc registers and not the whole
517 * module range. But we do want the offsets for these registers from the
518 * module base. This allows us to check them against the legacy hwmod
519 * platform data. Let's also check the ranges are configured properly.
520 */
521static int sysc_parse_and_check_child_range(struct sysc *ddata)
522{
523 struct device_node *np = ddata->dev->of_node;
524 const __be32 *ranges;
525 u32 nr_addr, nr_size;
526 int len, error;
527
528 ranges = of_get_property(np, "ranges", &len);
529 if (!ranges) {
530 dev_err(ddata->dev, "missing ranges for %pOF\n", np);
531
532 return -ENOENT;
533 }
534
535 len /= sizeof(*ranges);
536
537 if (len < 3) {
538 dev_err(ddata->dev, "incomplete ranges for %pOF\n", np);
539
540 return -EINVAL;
541 }
542
543 error = of_property_read_u32(np, "#address-cells", &nr_addr);
544 if (error)
545 return -ENOENT;
546
547 error = of_property_read_u32(np, "#size-cells", &nr_size);
548 if (error)
549 return -ENOENT;
550
551 if (nr_addr != 1 || nr_size != 1) {
552 dev_err(ddata->dev, "invalid ranges for %pOF\n", np);
553
554 return -EINVAL;
555 }
556
557 ranges++;
558 ddata->module_pa = of_translate_address(np, ranges++);
559 ddata->module_size = be32_to_cpup(ranges);
560
561 return 0;
562}
563
564static struct device_node *stdout_path;
565
566static void sysc_init_stdout_path(struct sysc *ddata)
567{
568 struct device_node *np = NULL;
569 const char *uart;
570
571 if (IS_ERR(stdout_path))
572 return;
573
574 if (stdout_path)
575 return;
576
577 np = of_find_node_by_path("/chosen");
578 if (!np)
579 goto err;
580
581 uart = of_get_property(np, "stdout-path", NULL);
582 if (!uart)
583 goto err;
584
585 np = of_find_node_by_path(uart);
586 if (!np)
587 goto err;
588
589 stdout_path = np;
590
591 return;
592
593err:
594 stdout_path = ERR_PTR(-ENODEV);
595}
596
597static void sysc_check_quirk_stdout(struct sysc *ddata,
598 struct device_node *np)
599{
600 sysc_init_stdout_path(ddata);
601 if (np != stdout_path)
602 return;
603
604 ddata->cfg.quirks |= SYSC_QUIRK_NO_IDLE_ON_INIT |
605 SYSC_QUIRK_NO_RESET_ON_INIT;
606}
607
608/**
609 * sysc_check_one_child - check child configuration
610 * @ddata: device driver data
611 * @np: child device node
612 *
613 * Let's avoid messy situations where we have new interconnect target
614 * node but children have "ti,hwmods". These belong to the interconnect
615 * target node and are managed by this driver.
616 */
617static void sysc_check_one_child(struct sysc *ddata,
618 struct device_node *np)
619{
620 const char *name;
621
622 name = of_get_property(np, "ti,hwmods", NULL);
623 if (name)
624 dev_warn(ddata->dev, "really a child ti,hwmods property?");
625
626 sysc_check_quirk_stdout(ddata, np);
627 sysc_parse_dts_quirks(ddata, np, true);
628}
629
630static void sysc_check_children(struct sysc *ddata)
631{
632 struct device_node *child;
633
634 for_each_child_of_node(ddata->dev->of_node, child)
635 sysc_check_one_child(ddata, child);
636}
637
638/*
639 * So far only I2C uses 16-bit read access with clockactivity with revision
640 * in two registers with stride of 4. We can detect this based on the rev
641 * register size to configure things far enough to be able to properly read
642 * the revision register.
643 */
644static void sysc_check_quirk_16bit(struct sysc *ddata, struct resource *res)
645{
646 if (resource_size(res) == 8)
647 ddata->cfg.quirks |= SYSC_QUIRK_16BIT | SYSC_QUIRK_USE_CLOCKACT;
648}
649
650/**
651 * sysc_parse_one - parses the interconnect target module registers
652 * @ddata: device driver data
653 * @reg: register to parse
654 */
655static int sysc_parse_one(struct sysc *ddata, enum sysc_registers reg)
656{
657 struct resource *res;
658 const char *name;
659
660 switch (reg) {
661 case SYSC_REVISION:
662 case SYSC_SYSCONFIG:
663 case SYSC_SYSSTATUS:
664 name = reg_names[reg];
665 break;
666 default:
667 return -EINVAL;
668 }
669
670 res = platform_get_resource_byname(to_platform_device(ddata->dev),
671 IORESOURCE_MEM, name);
672 if (!res) {
673 ddata->offsets[reg] = -ENODEV;
674
675 return 0;
676 }
677
678 ddata->offsets[reg] = res->start - ddata->module_pa;
679 if (reg == SYSC_REVISION)
680 sysc_check_quirk_16bit(ddata, res);
681
682 return 0;
683}
684
685static int sysc_parse_registers(struct sysc *ddata)
686{
687 int i, error;
688
689 for (i = 0; i < SYSC_MAX_REGS; i++) {
690 error = sysc_parse_one(ddata, i);
691 if (error)
692 return error;
693 }
694
695 return 0;
696}
697
698/**
699 * sysc_check_registers - check for misconfigured register overlaps
700 * @ddata: device driver data
701 */
702static int sysc_check_registers(struct sysc *ddata)
703{
704 int i, j, nr_regs = 0, nr_matches = 0;
705
706 for (i = 0; i < SYSC_MAX_REGS; i++) {
707 if (ddata->offsets[i] < 0)
708 continue;
709
710 if (ddata->offsets[i] > (ddata->module_size - 4)) {
711 dev_err(ddata->dev, "register outside module range");
712
713 return -EINVAL;
714 }
715
716 for (j = 0; j < SYSC_MAX_REGS; j++) {
717 if (ddata->offsets[j] < 0)
718 continue;
719
720 if (ddata->offsets[i] == ddata->offsets[j])
721 nr_matches++;
722 }
723 nr_regs++;
724 }
725
726 if (nr_matches > nr_regs) {
727 dev_err(ddata->dev, "overlapping registers: (%i/%i)",
728 nr_regs, nr_matches);
729
730 return -EINVAL;
731 }
732
733 return 0;
734}
735
736/**
737 * syc_ioremap - ioremap register space for the interconnect target module
738 * @ddata: device driver data
739 *
740 * Note that the interconnect target module registers can be anywhere
741 * within the interconnect target module range. For example, SGX has
742 * them at offset 0x1fc00 in the 32MB module address space. And cpsw
743 * has them at offset 0x1200 in the CPSW_WR child. Usually the
744 * the interconnect target module registers are at the beginning of
745 * the module range though.
746 */
747static int sysc_ioremap(struct sysc *ddata)
748{
749 int size;
750
751 if (ddata->offsets[SYSC_REVISION] < 0 &&
752 ddata->offsets[SYSC_SYSCONFIG] < 0 &&
753 ddata->offsets[SYSC_SYSSTATUS] < 0) {
754 size = ddata->module_size;
755 } else {
756 size = max3(ddata->offsets[SYSC_REVISION],
757 ddata->offsets[SYSC_SYSCONFIG],
758 ddata->offsets[SYSC_SYSSTATUS]);
759
760 if (size < SZ_1K)
761 size = SZ_1K;
762
763 if ((size + sizeof(u32)) > ddata->module_size)
764 size = ddata->module_size;
765 }
766
767 ddata->module_va = devm_ioremap(ddata->dev,
768 ddata->module_pa,
769 size + sizeof(u32));
770 if (!ddata->module_va)
771 return -EIO;
772
773 return 0;
774}
775
776/**
777 * sysc_map_and_check_registers - ioremap and check device registers
778 * @ddata: device driver data
779 */
780static int sysc_map_and_check_registers(struct sysc *ddata)
781{
782 int error;
783
784 error = sysc_parse_and_check_child_range(ddata);
785 if (error)
786 return error;
787
788 sysc_check_children(ddata);
789
790 error = sysc_parse_registers(ddata);
791 if (error)
792 return error;
793
794 error = sysc_ioremap(ddata);
795 if (error)
796 return error;
797
798 error = sysc_check_registers(ddata);
799 if (error)
800 return error;
801
802 return 0;
803}
804
805/**
806 * sysc_show_rev - read and show interconnect target module revision
807 * @bufp: buffer to print the information to
808 * @ddata: device driver data
809 */
810static int sysc_show_rev(char *bufp, struct sysc *ddata)
811{
812 int len;
813
814 if (ddata->offsets[SYSC_REVISION] < 0)
815 return sprintf(bufp, ":NA");
816
817 len = sprintf(bufp, ":%08x", ddata->revision);
818
819 return len;
820}
821
822static int sysc_show_reg(struct sysc *ddata,
823 char *bufp, enum sysc_registers reg)
824{
825 if (ddata->offsets[reg] < 0)
826 return sprintf(bufp, ":NA");
827
828 return sprintf(bufp, ":%x", ddata->offsets[reg]);
829}
830
831static int sysc_show_name(char *bufp, struct sysc *ddata)
832{
833 if (!ddata->name)
834 return 0;
835
836 return sprintf(bufp, ":%s", ddata->name);
837}
838
839/**
840 * sysc_show_registers - show information about interconnect target module
841 * @ddata: device driver data
842 */
843static void sysc_show_registers(struct sysc *ddata)
844{
845 char buf[128];
846 char *bufp = buf;
847 int i;
848
849 for (i = 0; i < SYSC_MAX_REGS; i++)
850 bufp += sysc_show_reg(ddata, bufp, i);
851
852 bufp += sysc_show_rev(bufp, ddata);
853 bufp += sysc_show_name(bufp, ddata);
854
855 dev_dbg(ddata->dev, "%llx:%x%s\n",
856 ddata->module_pa, ddata->module_size,
857 buf);
858}
859
860#define SYSC_IDLE_MASK (SYSC_NR_IDLEMODES - 1)
861#define SYSC_CLOCACT_ICK 2
862
863/* Caller needs to manage sysc_clkdm_deny_idle() and sysc_clkdm_allow_idle() */
864static int sysc_enable_module(struct device *dev)
865{
866 struct sysc *ddata;
867 const struct sysc_regbits *regbits;
868 u32 reg, idlemodes, best_mode;
869
870 ddata = dev_get_drvdata(dev);
871 if (ddata->offsets[SYSC_SYSCONFIG] == -ENODEV)
872 return 0;
873
874 regbits = ddata->cap->regbits;
875 reg = sysc_read(ddata, ddata->offsets[SYSC_SYSCONFIG]);
876
877 /* Set CLOCKACTIVITY, we only use it for ick */
878 if (regbits->clkact_shift >= 0 &&
879 (ddata->cfg.quirks & SYSC_QUIRK_USE_CLOCKACT ||
880 ddata->cfg.sysc_val & BIT(regbits->clkact_shift)))
881 reg |= SYSC_CLOCACT_ICK << regbits->clkact_shift;
882
883 /* Set SIDLE mode */
884 idlemodes = ddata->cfg.sidlemodes;
885 if (!idlemodes || regbits->sidle_shift < 0)
886 goto set_midle;
887
888 if (ddata->cfg.quirks & (SYSC_QUIRK_SWSUP_SIDLE |
889 SYSC_QUIRK_SWSUP_SIDLE_ACT)) {
890 best_mode = SYSC_IDLE_NO;
891 } else {
892 best_mode = fls(ddata->cfg.sidlemodes) - 1;
893 if (best_mode > SYSC_IDLE_MASK) {
894 dev_err(dev, "%s: invalid sidlemode\n", __func__);
895 return -EINVAL;
896 }
897
898 /* Set WAKEUP */
899 if (regbits->enwkup_shift >= 0 &&
900 ddata->cfg.sysc_val & BIT(regbits->enwkup_shift))
901 reg |= BIT(regbits->enwkup_shift);
902 }
903
904 reg &= ~(SYSC_IDLE_MASK << regbits->sidle_shift);
905 reg |= best_mode << regbits->sidle_shift;
906 sysc_write(ddata, ddata->offsets[SYSC_SYSCONFIG], reg);
907
908set_midle:
909 /* Set MIDLE mode */
910 idlemodes = ddata->cfg.midlemodes;
911 if (!idlemodes || regbits->midle_shift < 0)
912 goto set_autoidle;
913
914 best_mode = fls(ddata->cfg.midlemodes) - 1;
915 if (best_mode > SYSC_IDLE_MASK) {
916 dev_err(dev, "%s: invalid midlemode\n", __func__);
917 return -EINVAL;
918 }
919
920 reg &= ~(SYSC_IDLE_MASK << regbits->midle_shift);
921 reg |= best_mode << regbits->midle_shift;
922 sysc_write(ddata, ddata->offsets[SYSC_SYSCONFIG], reg);
923
924set_autoidle:
925 /* Autoidle bit must enabled separately if available */
926 if (regbits->autoidle_shift >= 0 &&
927 ddata->cfg.sysc_val & BIT(regbits->autoidle_shift)) {
928 reg |= 1 << regbits->autoidle_shift;
929 sysc_write(ddata, ddata->offsets[SYSC_SYSCONFIG], reg);
930 }
931
932 if (ddata->module_enable_quirk)
933 ddata->module_enable_quirk(ddata);
934
935 return 0;
936}
937
938static int sysc_best_idle_mode(u32 idlemodes, u32 *best_mode)
939{
940 if (idlemodes & BIT(SYSC_IDLE_SMART_WKUP))
941 *best_mode = SYSC_IDLE_SMART_WKUP;
942 else if (idlemodes & BIT(SYSC_IDLE_SMART))
943 *best_mode = SYSC_IDLE_SMART;
944 else if (idlemodes & BIT(SYSC_IDLE_FORCE))
945 *best_mode = SYSC_IDLE_FORCE;
946 else
947 return -EINVAL;
948
949 return 0;
950}
951
952/* Caller needs to manage sysc_clkdm_deny_idle() and sysc_clkdm_allow_idle() */
953static int sysc_disable_module(struct device *dev)
954{
955 struct sysc *ddata;
956 const struct sysc_regbits *regbits;
957 u32 reg, idlemodes, best_mode;
958 int ret;
959
960 ddata = dev_get_drvdata(dev);
961 if (ddata->offsets[SYSC_SYSCONFIG] == -ENODEV)
962 return 0;
963
964 if (ddata->module_disable_quirk)
965 ddata->module_disable_quirk(ddata);
966
967 regbits = ddata->cap->regbits;
968 reg = sysc_read(ddata, ddata->offsets[SYSC_SYSCONFIG]);
969
970 /* Set MIDLE mode */
971 idlemodes = ddata->cfg.midlemodes;
972 if (!idlemodes || regbits->midle_shift < 0)
973 goto set_sidle;
974
975 ret = sysc_best_idle_mode(idlemodes, &best_mode);
976 if (ret) {
977 dev_err(dev, "%s: invalid midlemode\n", __func__);
978 return ret;
979 }
980
981 reg &= ~(SYSC_IDLE_MASK << regbits->midle_shift);
982 reg |= best_mode << regbits->midle_shift;
983 sysc_write(ddata, ddata->offsets[SYSC_SYSCONFIG], reg);
984
985set_sidle:
986 /* Set SIDLE mode */
987 idlemodes = ddata->cfg.sidlemodes;
988 if (!idlemodes || regbits->sidle_shift < 0)
989 return 0;
990
991 if (ddata->cfg.quirks & SYSC_QUIRK_SWSUP_SIDLE) {
992 best_mode = SYSC_IDLE_FORCE;
993 } else {
994 ret = sysc_best_idle_mode(idlemodes, &best_mode);
995 if (ret) {
996 dev_err(dev, "%s: invalid sidlemode\n", __func__);
997 return ret;
998 }
999 }
1000
1001 reg &= ~(SYSC_IDLE_MASK << regbits->sidle_shift);
1002 reg |= best_mode << regbits->sidle_shift;
1003 if (regbits->autoidle_shift >= 0 &&
1004 ddata->cfg.sysc_val & BIT(regbits->autoidle_shift))
1005 reg |= 1 << regbits->autoidle_shift;
1006 sysc_write(ddata, ddata->offsets[SYSC_SYSCONFIG], reg);
1007
1008 return 0;
1009}
1010
1011static int __maybe_unused sysc_runtime_suspend_legacy(struct device *dev,
1012 struct sysc *ddata)
1013{
1014 struct ti_sysc_platform_data *pdata;
1015 int error;
1016
1017 pdata = dev_get_platdata(ddata->dev);
1018 if (!pdata)
1019 return 0;
1020
1021 if (!pdata->idle_module)
1022 return -ENODEV;
1023
1024 error = pdata->idle_module(dev, &ddata->cookie);
1025 if (error)
1026 dev_err(dev, "%s: could not idle: %i\n",
1027 __func__, error);
1028
1029 reset_control_assert(ddata->rsts);
1030
1031 return 0;
1032}
1033
1034static int __maybe_unused sysc_runtime_resume_legacy(struct device *dev,
1035 struct sysc *ddata)
1036{
1037 struct ti_sysc_platform_data *pdata;
1038 int error;
1039
1040 reset_control_deassert(ddata->rsts);
1041
1042 pdata = dev_get_platdata(ddata->dev);
1043 if (!pdata)
1044 return 0;
1045
1046 if (!pdata->enable_module)
1047 return -ENODEV;
1048
1049 error = pdata->enable_module(dev, &ddata->cookie);
1050 if (error)
1051 dev_err(dev, "%s: could not enable: %i\n",
1052 __func__, error);
1053
1054 return 0;
1055}
1056
1057static int __maybe_unused sysc_runtime_suspend(struct device *dev)
1058{
1059 struct sysc *ddata;
1060 int error = 0;
1061
1062 ddata = dev_get_drvdata(dev);
1063
1064 if (!ddata->enabled)
1065 return 0;
1066
1067 sysc_clkdm_deny_idle(ddata);
1068
1069 if (ddata->legacy_mode) {
1070 error = sysc_runtime_suspend_legacy(dev, ddata);
1071 if (error)
1072 goto err_allow_idle;
1073 } else {
1074 error = sysc_disable_module(dev);
1075 if (error)
1076 goto err_allow_idle;
1077 }
1078
1079 sysc_disable_main_clocks(ddata);
1080
1081 if (sysc_opt_clks_needed(ddata))
1082 sysc_disable_opt_clocks(ddata);
1083
1084 ddata->enabled = false;
1085
1086err_allow_idle:
1087 reset_control_assert(ddata->rsts);
1088
1089 sysc_clkdm_allow_idle(ddata);
1090
1091 return error;
1092}
1093
1094static int __maybe_unused sysc_runtime_resume(struct device *dev)
1095{
1096 struct sysc *ddata;
1097 int error = 0;
1098
1099 ddata = dev_get_drvdata(dev);
1100
1101 if (ddata->enabled)
1102 return 0;
1103
1104
1105 sysc_clkdm_deny_idle(ddata);
1106
1107 reset_control_deassert(ddata->rsts);
1108
1109 if (sysc_opt_clks_needed(ddata)) {
1110 error = sysc_enable_opt_clocks(ddata);
1111 if (error)
1112 goto err_allow_idle;
1113 }
1114
1115 error = sysc_enable_main_clocks(ddata);
1116 if (error)
1117 goto err_opt_clocks;
1118
1119 if (ddata->legacy_mode) {
1120 error = sysc_runtime_resume_legacy(dev, ddata);
1121 if (error)
1122 goto err_main_clocks;
1123 } else {
1124 error = sysc_enable_module(dev);
1125 if (error)
1126 goto err_main_clocks;
1127 }
1128
1129 ddata->enabled = true;
1130
1131 sysc_clkdm_allow_idle(ddata);
1132
1133 return 0;
1134
1135err_main_clocks:
1136 sysc_disable_main_clocks(ddata);
1137err_opt_clocks:
1138 if (sysc_opt_clks_needed(ddata))
1139 sysc_disable_opt_clocks(ddata);
1140err_allow_idle:
1141 sysc_clkdm_allow_idle(ddata);
1142
1143 return error;
1144}
1145
1146static int __maybe_unused sysc_noirq_suspend(struct device *dev)
1147{
1148 struct sysc *ddata;
1149
1150 ddata = dev_get_drvdata(dev);
1151
1152 if (ddata->cfg.quirks & SYSC_QUIRK_LEGACY_IDLE)
1153 return 0;
1154
1155 return pm_runtime_force_suspend(dev);
1156}
1157
1158static int __maybe_unused sysc_noirq_resume(struct device *dev)
1159{
1160 struct sysc *ddata;
1161
1162 ddata = dev_get_drvdata(dev);
1163
1164 if (ddata->cfg.quirks & SYSC_QUIRK_LEGACY_IDLE)
1165 return 0;
1166
1167 return pm_runtime_force_resume(dev);
1168}
1169
1170static const struct dev_pm_ops sysc_pm_ops = {
1171 SET_NOIRQ_SYSTEM_SLEEP_PM_OPS(sysc_noirq_suspend, sysc_noirq_resume)
1172 SET_RUNTIME_PM_OPS(sysc_runtime_suspend,
1173 sysc_runtime_resume,
1174 NULL)
1175};
1176
1177/* Module revision register based quirks */
1178struct sysc_revision_quirk {
1179 const char *name;
1180 u32 base;
1181 int rev_offset;
1182 int sysc_offset;
1183 int syss_offset;
1184 u32 revision;
1185 u32 revision_mask;
1186 u32 quirks;
1187};
1188
1189#define SYSC_QUIRK(optname, optbase, optrev, optsysc, optsyss, \
1190 optrev_val, optrevmask, optquirkmask) \
1191 { \
1192 .name = (optname), \
1193 .base = (optbase), \
1194 .rev_offset = (optrev), \
1195 .sysc_offset = (optsysc), \
1196 .syss_offset = (optsyss), \
1197 .revision = (optrev_val), \
1198 .revision_mask = (optrevmask), \
1199 .quirks = (optquirkmask), \
1200 }
1201
1202static const struct sysc_revision_quirk sysc_revision_quirks[] = {
1203 /* These drivers need to be fixed to not use pm_runtime_irq_safe() */
1204 SYSC_QUIRK("gpio", 0, 0, 0x10, 0x114, 0x50600801, 0xffff00ff,
1205 SYSC_QUIRK_LEGACY_IDLE | SYSC_QUIRK_OPT_CLKS_IN_RESET),
1206 SYSC_QUIRK("mmu", 0, 0, 0x10, 0x14, 0x00000020, 0xffffffff,
1207 SYSC_QUIRK_LEGACY_IDLE),
1208 SYSC_QUIRK("mmu", 0, 0, 0x10, 0x14, 0x00000030, 0xffffffff,
1209 SYSC_QUIRK_LEGACY_IDLE),
1210 SYSC_QUIRK("sham", 0, 0x100, 0x110, 0x114, 0x40000c03, 0xffffffff,
1211 SYSC_QUIRK_LEGACY_IDLE),
1212 SYSC_QUIRK("smartreflex", 0, -1, 0x24, -1, 0x00000000, 0xffffffff,
1213 SYSC_QUIRK_LEGACY_IDLE),
1214 SYSC_QUIRK("smartreflex", 0, -1, 0x38, -1, 0x00000000, 0xffffffff,
1215 SYSC_QUIRK_LEGACY_IDLE),
1216 SYSC_QUIRK("timer", 0, 0, 0x10, 0x14, 0x00000015, 0xffffffff,
1217 0),
1218 /* Some timers on omap4 and later */
1219 SYSC_QUIRK("timer", 0, 0, 0x10, -1, 0x50002100, 0xffffffff,
1220 0),
1221 SYSC_QUIRK("timer", 0, 0, 0x10, -1, 0x4fff1301, 0xffff00ff,
1222 0),
1223 SYSC_QUIRK("uart", 0, 0x50, 0x54, 0x58, 0x00000046, 0xffffffff,
1224 SYSC_QUIRK_SWSUP_SIDLE | SYSC_QUIRK_LEGACY_IDLE),
1225 SYSC_QUIRK("uart", 0, 0x50, 0x54, 0x58, 0x00000052, 0xffffffff,
1226 SYSC_QUIRK_SWSUP_SIDLE | SYSC_QUIRK_LEGACY_IDLE),
1227 /* Uarts on omap4 and later */
1228 SYSC_QUIRK("uart", 0, 0x50, 0x54, 0x58, 0x50411e03, 0xffff00ff,
1229 SYSC_QUIRK_SWSUP_SIDLE_ACT | SYSC_QUIRK_LEGACY_IDLE),
1230 SYSC_QUIRK("uart", 0, 0x50, 0x54, 0x58, 0x47422e03, 0xffffffff,
1231 SYSC_QUIRK_SWSUP_SIDLE_ACT | SYSC_QUIRK_LEGACY_IDLE),
1232
1233 /* Quirks that need to be set based on the module address */
1234 SYSC_QUIRK("mcpdm", 0x40132000, 0, 0x10, -1, 0x50000800, 0xffffffff,
1235 SYSC_QUIRK_EXT_OPT_CLOCK | SYSC_QUIRK_NO_RESET_ON_INIT |
1236 SYSC_QUIRK_SWSUP_SIDLE),
1237
1238 /* Quirks that need to be set based on detected module */
1239 SYSC_QUIRK("hdq1w", 0, 0, 0x14, 0x18, 0x00000006, 0xffffffff,
1240 SYSC_MODULE_QUIRK_HDQ1W),
1241 SYSC_QUIRK("hdq1w", 0, 0, 0x14, 0x18, 0x0000000a, 0xffffffff,
1242 SYSC_MODULE_QUIRK_HDQ1W),
1243 SYSC_QUIRK("i2c", 0, 0, 0x20, 0x10, 0x00000036, 0x000000ff,
1244 SYSC_MODULE_QUIRK_I2C),
1245 SYSC_QUIRK("i2c", 0, 0, 0x20, 0x10, 0x0000003c, 0x000000ff,
1246 SYSC_MODULE_QUIRK_I2C),
1247 SYSC_QUIRK("i2c", 0, 0, 0x20, 0x10, 0x00000040, 0x000000ff,
1248 SYSC_MODULE_QUIRK_I2C),
1249 SYSC_QUIRK("i2c", 0, 0, 0x10, 0x90, 0x5040000a, 0xfffff0f0,
1250 SYSC_MODULE_QUIRK_I2C),
1251 SYSC_QUIRK("gpu", 0x50000000, 0x14, -1, -1, 0x00010201, 0xffffffff, 0),
1252 SYSC_QUIRK("gpu", 0x50000000, 0xfe00, 0xfe10, -1, 0x40000000 , 0xffffffff,
1253 SYSC_MODULE_QUIRK_SGX),
1254 SYSC_QUIRK("wdt", 0, 0, 0x10, 0x14, 0x502a0500, 0xfffff0f0,
1255 SYSC_MODULE_QUIRK_WDT),
1256 /* Watchdog on am3 and am4 */
1257 SYSC_QUIRK("wdt", 0x44e35000, 0, 0x10, 0x14, 0x502a0500, 0xfffff0f0,
1258 SYSC_MODULE_QUIRK_WDT | SYSC_QUIRK_SWSUP_SIDLE),
1259
1260#ifdef DEBUG
1261 SYSC_QUIRK("adc", 0, 0, 0x10, -1, 0x47300001, 0xffffffff, 0),
1262 SYSC_QUIRK("atl", 0, 0, -1, -1, 0x0a070100, 0xffffffff, 0),
1263 SYSC_QUIRK("aess", 0, 0, 0x10, -1, 0x40000000, 0xffffffff, 0),
1264 SYSC_QUIRK("cm", 0, 0, -1, -1, 0x40000301, 0xffffffff, 0),
1265 SYSC_QUIRK("control", 0, 0, 0x10, -1, 0x40000900, 0xffffffff, 0),
1266 SYSC_QUIRK("cpgmac", 0, 0x1200, 0x1208, 0x1204, 0x4edb1902,
1267 0xffff00f0, 0),
1268 SYSC_QUIRK("dcan", 0, 0x20, -1, -1, 0xa3170504, 0xffffffff, 0),
1269 SYSC_QUIRK("dcan", 0, 0x20, -1, -1, 0x4edb1902, 0xffffffff, 0),
1270 SYSC_QUIRK("dmic", 0, 0, 0x10, -1, 0x50010000, 0xffffffff, 0),
1271 SYSC_QUIRK("dwc3", 0, 0, 0x10, -1, 0x500a0200, 0xffffffff, 0),
1272 SYSC_QUIRK("d2d", 0x4a0b6000, 0, 0x10, 0x14, 0x00000010, 0xffffffff, 0),
1273 SYSC_QUIRK("d2d", 0x4a0cd000, 0, 0x10, 0x14, 0x00000010, 0xffffffff, 0),
1274 SYSC_QUIRK("epwmss", 0, 0, 0x4, -1, 0x47400001, 0xffffffff, 0),
1275 SYSC_QUIRK("gpu", 0, 0x1fc00, 0x1fc10, -1, 0, 0, 0),
1276 SYSC_QUIRK("gpu", 0, 0xfe00, 0xfe10, -1, 0x40000000 , 0xffffffff, 0),
1277 SYSC_QUIRK("hsi", 0, 0, 0x10, 0x14, 0x50043101, 0xffffffff, 0),
1278 SYSC_QUIRK("iss", 0, 0, 0x10, -1, 0x40000101, 0xffffffff, 0),
1279 SYSC_QUIRK("lcdc", 0, 0, 0x54, -1, 0x4f201000, 0xffffffff, 0),
1280 SYSC_QUIRK("mcasp", 0, 0, 0x4, -1, 0x44306302, 0xffffffff, 0),
1281 SYSC_QUIRK("mcasp", 0, 0, 0x4, -1, 0x44307b02, 0xffffffff, 0),
1282 SYSC_QUIRK("mcbsp", 0, -1, 0x8c, -1, 0, 0, 0),
1283 SYSC_QUIRK("mcspi", 0, 0, 0x10, -1, 0x40300a0b, 0xffff00ff, 0),
1284 SYSC_QUIRK("mcspi", 0, 0, 0x110, 0x114, 0x40300a0b, 0xffffffff, 0),
1285 SYSC_QUIRK("mailbox", 0, 0, 0x10, -1, 0x00000400, 0xffffffff, 0),
1286 SYSC_QUIRK("m3", 0, 0, -1, -1, 0x5f580105, 0x0fff0f00, 0),
1287 SYSC_QUIRK("ocp2scp", 0, 0, 0x10, 0x14, 0x50060005, 0xfffffff0, 0),
1288 SYSC_QUIRK("ocp2scp", 0, 0, -1, -1, 0x50060007, 0xffffffff, 0),
1289 SYSC_QUIRK("padconf", 0, 0, 0x10, -1, 0x4fff0800, 0xffffffff, 0),
1290 SYSC_QUIRK("padconf", 0, 0, -1, -1, 0x40001100, 0xffffffff, 0),
1291 SYSC_QUIRK("prcm", 0, 0, -1, -1, 0x40000100, 0xffffffff, 0),
1292 SYSC_QUIRK("prcm", 0, 0, -1, -1, 0x00004102, 0xffffffff, 0),
1293 SYSC_QUIRK("prcm", 0, 0, -1, -1, 0x40000400, 0xffffffff, 0),
1294 SYSC_QUIRK("scm", 0, 0, 0x10, -1, 0x40000900, 0xffffffff, 0),
1295 SYSC_QUIRK("scm", 0, 0, -1, -1, 0x4e8b0100, 0xffffffff, 0),
1296 SYSC_QUIRK("scm", 0, 0, -1, -1, 0x4f000100, 0xffffffff, 0),
1297 SYSC_QUIRK("scm", 0, 0, -1, -1, 0x40000900, 0xffffffff, 0),
1298 SYSC_QUIRK("scrm", 0, 0, -1, -1, 0x00000010, 0xffffffff, 0),
1299 SYSC_QUIRK("sdio", 0, 0, 0x10, -1, 0x40202301, 0xffff0ff0, 0),
1300 SYSC_QUIRK("sdio", 0, 0x2fc, 0x110, 0x114, 0x31010000, 0xffffffff, 0),
1301 SYSC_QUIRK("sdma", 0, 0, 0x2c, 0x28, 0x00010900, 0xffffffff, 0),
1302 SYSC_QUIRK("slimbus", 0, 0, 0x10, -1, 0x40000902, 0xffffffff, 0),
1303 SYSC_QUIRK("slimbus", 0, 0, 0x10, -1, 0x40002903, 0xffffffff, 0),
1304 SYSC_QUIRK("spinlock", 0, 0, 0x10, -1, 0x50020000, 0xffffffff, 0),
1305 SYSC_QUIRK("rng", 0, 0x1fe0, 0x1fe4, -1, 0x00000020, 0xffffffff, 0),
1306 SYSC_QUIRK("rtc", 0, 0x74, 0x78, -1, 0x4eb01908, 0xffff00f0, 0),
1307 SYSC_QUIRK("timer32k", 0, 0, 0x4, -1, 0x00000060, 0xffffffff, 0),
1308 SYSC_QUIRK("usbhstll", 0, 0, 0x10, 0x14, 0x00000004, 0xffffffff, 0),
1309 SYSC_QUIRK("usbhstll", 0, 0, 0x10, 0x14, 0x00000008, 0xffffffff, 0),
1310 SYSC_QUIRK("usb_host_hs", 0, 0, 0x10, 0x14, 0x50700100, 0xffffffff, 0),
1311 SYSC_QUIRK("usb_host_hs", 0, 0, 0x10, -1, 0x50700101, 0xffffffff, 0),
1312 SYSC_QUIRK("usb_otg_hs", 0, 0x400, 0x404, 0x408, 0x00000050,
1313 0xffffffff, 0),
1314 SYSC_QUIRK("vfpe", 0, 0, 0x104, -1, 0x4d001200, 0xffffffff, 0),
1315#endif
1316};
1317
1318/*
1319 * Early quirks based on module base and register offsets only that are
1320 * needed before the module revision can be read
1321 */
1322static void sysc_init_early_quirks(struct sysc *ddata)
1323{
1324 const struct sysc_revision_quirk *q;
1325 int i;
1326
1327 for (i = 0; i < ARRAY_SIZE(sysc_revision_quirks); i++) {
1328 q = &sysc_revision_quirks[i];
1329
1330 if (!q->base)
1331 continue;
1332
1333 if (q->base != ddata->module_pa)
1334 continue;
1335
1336 if (q->rev_offset >= 0 &&
1337 q->rev_offset != ddata->offsets[SYSC_REVISION])
1338 continue;
1339
1340 if (q->sysc_offset >= 0 &&
1341 q->sysc_offset != ddata->offsets[SYSC_SYSCONFIG])
1342 continue;
1343
1344 if (q->syss_offset >= 0 &&
1345 q->syss_offset != ddata->offsets[SYSC_SYSSTATUS])
1346 continue;
1347
1348 ddata->name = q->name;
1349 ddata->cfg.quirks |= q->quirks;
1350 }
1351}
1352
1353/* Quirks that also consider the revision register value */
1354static void sysc_init_revision_quirks(struct sysc *ddata)
1355{
1356 const struct sysc_revision_quirk *q;
1357 int i;
1358
1359 for (i = 0; i < ARRAY_SIZE(sysc_revision_quirks); i++) {
1360 q = &sysc_revision_quirks[i];
1361
1362 if (q->base && q->base != ddata->module_pa)
1363 continue;
1364
1365 if (q->rev_offset >= 0 &&
1366 q->rev_offset != ddata->offsets[SYSC_REVISION])
1367 continue;
1368
1369 if (q->sysc_offset >= 0 &&
1370 q->sysc_offset != ddata->offsets[SYSC_SYSCONFIG])
1371 continue;
1372
1373 if (q->syss_offset >= 0 &&
1374 q->syss_offset != ddata->offsets[SYSC_SYSSTATUS])
1375 continue;
1376
1377 if (q->revision == ddata->revision ||
1378 (q->revision & q->revision_mask) ==
1379 (ddata->revision & q->revision_mask)) {
1380 ddata->name = q->name;
1381 ddata->cfg.quirks |= q->quirks;
1382 }
1383 }
1384}
1385
1386/* 1-wire needs module's internal clocks enabled for reset */
1387static void sysc_clk_enable_quirk_hdq1w(struct sysc *ddata)
1388{
1389 int offset = 0x0c; /* HDQ_CTRL_STATUS */
1390 u16 val;
1391
1392 val = sysc_read(ddata, offset);
1393 val |= BIT(5);
1394 sysc_write(ddata, offset, val);
1395}
1396
1397/* I2C needs extra enable bit toggling for reset */
1398static void sysc_clk_quirk_i2c(struct sysc *ddata, bool enable)
1399{
1400 int offset;
1401 u16 val;
1402
1403 /* I2C_CON, omap2/3 is different from omap4 and later */
1404 if ((ddata->revision & 0xffffff00) == 0x001f0000)
1405 offset = 0x24;
1406 else
1407 offset = 0xa4;
1408
1409 /* I2C_EN */
1410 val = sysc_read(ddata, offset);
1411 if (enable)
1412 val |= BIT(15);
1413 else
1414 val &= ~BIT(15);
1415 sysc_write(ddata, offset, val);
1416}
1417
1418static void sysc_clk_enable_quirk_i2c(struct sysc *ddata)
1419{
1420 sysc_clk_quirk_i2c(ddata, true);
1421}
1422
1423static void sysc_clk_disable_quirk_i2c(struct sysc *ddata)
1424{
1425 sysc_clk_quirk_i2c(ddata, false);
1426}
1427
1428/* 36xx SGX needs a quirk for to bypass OCP IPG interrupt logic */
1429static void sysc_module_enable_quirk_sgx(struct sysc *ddata)
1430{
1431 int offset = 0xff08; /* OCP_DEBUG_CONFIG */
1432 u32 val = BIT(31); /* THALIA_INT_BYPASS */
1433
1434 sysc_write(ddata, offset, val);
1435}
1436
1437/* Watchdog timer needs a disable sequence after reset */
1438static void sysc_reset_done_quirk_wdt(struct sysc *ddata)
1439{
1440 int wps, spr, error;
1441 u32 val;
1442
1443 wps = 0x34;
1444 spr = 0x48;
1445
1446 sysc_write(ddata, spr, 0xaaaa);
1447 error = readl_poll_timeout(ddata->module_va + wps, val,
1448 !(val & 0x10), 100,
1449 MAX_MODULE_SOFTRESET_WAIT);
1450 if (error)
1451 dev_warn(ddata->dev, "wdt disable step1 failed\n");
1452
1453 sysc_write(ddata, spr, 0x5555);
1454 error = readl_poll_timeout(ddata->module_va + wps, val,
1455 !(val & 0x10), 100,
1456 MAX_MODULE_SOFTRESET_WAIT);
1457 if (error)
1458 dev_warn(ddata->dev, "wdt disable step2 failed\n");
1459}
1460
1461static void sysc_init_module_quirks(struct sysc *ddata)
1462{
1463 if (ddata->legacy_mode || !ddata->name)
1464 return;
1465
1466 if (ddata->cfg.quirks & SYSC_MODULE_QUIRK_HDQ1W) {
1467 ddata->clk_enable_quirk = sysc_clk_enable_quirk_hdq1w;
1468
1469 return;
1470 }
1471
1472 if (ddata->cfg.quirks & SYSC_MODULE_QUIRK_I2C) {
1473 ddata->clk_enable_quirk = sysc_clk_enable_quirk_i2c;
1474 ddata->clk_disable_quirk = sysc_clk_disable_quirk_i2c;
1475
1476 return;
1477 }
1478
1479 if (ddata->cfg.quirks & SYSC_MODULE_QUIRK_SGX)
1480 ddata->module_enable_quirk = sysc_module_enable_quirk_sgx;
1481
1482 if (ddata->cfg.quirks & SYSC_MODULE_QUIRK_WDT) {
1483 ddata->reset_done_quirk = sysc_reset_done_quirk_wdt;
1484 ddata->module_disable_quirk = sysc_reset_done_quirk_wdt;
1485 }
1486}
1487
1488static int sysc_clockdomain_init(struct sysc *ddata)
1489{
1490 struct ti_sysc_platform_data *pdata = dev_get_platdata(ddata->dev);
1491 struct clk *fck = NULL, *ick = NULL;
1492 int error;
1493
1494 if (!pdata || !pdata->init_clockdomain)
1495 return 0;
1496
1497 switch (ddata->nr_clocks) {
1498 case 2:
1499 ick = ddata->clocks[SYSC_ICK];
1500 /* fallthrough */
1501 case 1:
1502 fck = ddata->clocks[SYSC_FCK];
1503 break;
1504 case 0:
1505 return 0;
1506 }
1507
1508 error = pdata->init_clockdomain(ddata->dev, fck, ick, &ddata->cookie);
1509 if (!error || error == -ENODEV)
1510 return 0;
1511
1512 return error;
1513}
1514
1515/*
1516 * Note that pdata->init_module() typically does a reset first. After
1517 * pdata->init_module() is done, PM runtime can be used for the interconnect
1518 * target module.
1519 */
1520static int sysc_legacy_init(struct sysc *ddata)
1521{
1522 struct ti_sysc_platform_data *pdata = dev_get_platdata(ddata->dev);
1523 int error;
1524
1525 if (!pdata || !pdata->init_module)
1526 return 0;
1527
1528 error = pdata->init_module(ddata->dev, ddata->mdata, &ddata->cookie);
1529 if (error == -EEXIST)
1530 error = 0;
1531
1532 return error;
1533}
1534
1535/**
1536 * sysc_rstctrl_reset_deassert - deassert rstctrl reset
1537 * @ddata: device driver data
1538 * @reset: reset before deassert
1539 *
1540 * A module can have both OCP softreset control and external rstctrl.
1541 * If more complicated rstctrl resets are needed, please handle these
1542 * directly from the child device driver and map only the module reset
1543 * for the parent interconnect target module device.
1544 *
1545 * Automatic reset of the module on init can be skipped with the
1546 * "ti,no-reset-on-init" device tree property.
1547 */
1548static int sysc_rstctrl_reset_deassert(struct sysc *ddata, bool reset)
1549{
1550 int error;
1551
1552 if (!ddata->rsts)
1553 return 0;
1554
1555 if (reset) {
1556 error = reset_control_assert(ddata->rsts);
1557 if (error)
1558 return error;
1559 }
1560
1561 reset_control_deassert(ddata->rsts);
1562
1563 return 0;
1564}
1565
1566/*
1567 * Note that the caller must ensure the interconnect target module is enabled
1568 * before calling reset. Otherwise reset will not complete.
1569 */
1570static int sysc_reset(struct sysc *ddata)
1571{
1572 int sysc_offset, syss_offset, sysc_val, rstval, error = 0;
1573 u32 sysc_mask, syss_done;
1574
1575 sysc_offset = ddata->offsets[SYSC_SYSCONFIG];
1576 syss_offset = ddata->offsets[SYSC_SYSSTATUS];
1577
1578 if (ddata->legacy_mode || sysc_offset < 0 ||
1579 ddata->cap->regbits->srst_shift < 0 ||
1580 ddata->cfg.quirks & SYSC_QUIRK_NO_RESET_ON_INIT)
1581 return 0;
1582
1583 sysc_mask = BIT(ddata->cap->regbits->srst_shift);
1584
1585 if (ddata->cfg.quirks & SYSS_QUIRK_RESETDONE_INVERTED)
1586 syss_done = 0;
1587 else
1588 syss_done = ddata->cfg.syss_mask;
1589
1590 if (ddata->clk_disable_quirk)
1591 ddata->clk_disable_quirk(ddata);
1592
1593 sysc_val = sysc_read_sysconfig(ddata);
1594 sysc_val |= sysc_mask;
1595 sysc_write(ddata, sysc_offset, sysc_val);
1596
1597 if (ddata->clk_enable_quirk)
1598 ddata->clk_enable_quirk(ddata);
1599
1600 /* Poll on reset status */
1601 if (syss_offset >= 0) {
1602 error = readx_poll_timeout(sysc_read_sysstatus, ddata, rstval,
1603 (rstval & ddata->cfg.syss_mask) ==
1604 syss_done,
1605 100, MAX_MODULE_SOFTRESET_WAIT);
1606
1607 } else if (ddata->cfg.quirks & SYSC_QUIRK_RESET_STATUS) {
1608 error = readx_poll_timeout(sysc_read_sysconfig, ddata, rstval,
1609 !(rstval & sysc_mask),
1610 100, MAX_MODULE_SOFTRESET_WAIT);
1611 }
1612
1613 if (ddata->reset_done_quirk)
1614 ddata->reset_done_quirk(ddata);
1615
1616 return error;
1617}
1618
1619/*
1620 * At this point the module is configured enough to read the revision but
1621 * module may not be completely configured yet to use PM runtime. Enable
1622 * all clocks directly during init to configure the quirks needed for PM
1623 * runtime based on the revision register.
1624 */
1625static int sysc_init_module(struct sysc *ddata)
1626{
1627 int error = 0;
1628 bool manage_clocks = true;
1629
1630 error = sysc_rstctrl_reset_deassert(ddata, false);
1631 if (error)
1632 return error;
1633
1634 if (ddata->cfg.quirks &
1635 (SYSC_QUIRK_NO_IDLE | SYSC_QUIRK_NO_IDLE_ON_INIT))
1636 manage_clocks = false;
1637
1638 error = sysc_clockdomain_init(ddata);
1639 if (error)
1640 return error;
1641
1642 sysc_clkdm_deny_idle(ddata);
1643
1644 /*
1645 * Always enable clocks. The bootloader may or may not have enabled
1646 * the related clocks.
1647 */
1648 error = sysc_enable_opt_clocks(ddata);
1649 if (error)
1650 return error;
1651
1652 error = sysc_enable_main_clocks(ddata);
1653 if (error)
1654 goto err_opt_clocks;
1655
1656 if (!(ddata->cfg.quirks & SYSC_QUIRK_NO_RESET_ON_INIT)) {
1657 error = sysc_rstctrl_reset_deassert(ddata, true);
1658 if (error)
1659 goto err_main_clocks;
1660 }
1661
1662 ddata->revision = sysc_read_revision(ddata);
1663 sysc_init_revision_quirks(ddata);
1664 sysc_init_module_quirks(ddata);
1665
1666 if (ddata->legacy_mode) {
1667 error = sysc_legacy_init(ddata);
1668 if (error)
1669 goto err_main_clocks;
1670 }
1671
1672 if (!ddata->legacy_mode) {
1673 error = sysc_enable_module(ddata->dev);
1674 if (error)
1675 goto err_main_clocks;
1676 }
1677
1678 error = sysc_reset(ddata);
1679 if (error)
1680 dev_err(ddata->dev, "Reset failed with %d\n", error);
1681
1682 if (!ddata->legacy_mode && manage_clocks)
1683 sysc_disable_module(ddata->dev);
1684
1685err_main_clocks:
1686 if (manage_clocks)
1687 sysc_disable_main_clocks(ddata);
1688err_opt_clocks:
1689 /* No re-enable of clockdomain autoidle to prevent module autoidle */
1690 if (manage_clocks) {
1691 sysc_disable_opt_clocks(ddata);
1692 sysc_clkdm_allow_idle(ddata);
1693 }
1694
1695 return error;
1696}
1697
1698static int sysc_init_sysc_mask(struct sysc *ddata)
1699{
1700 struct device_node *np = ddata->dev->of_node;
1701 int error;
1702 u32 val;
1703
1704 error = of_property_read_u32(np, "ti,sysc-mask", &val);
1705 if (error)
1706 return 0;
1707
1708 ddata->cfg.sysc_val = val & ddata->cap->sysc_mask;
1709
1710 return 0;
1711}
1712
1713static int sysc_init_idlemode(struct sysc *ddata, u8 *idlemodes,
1714 const char *name)
1715{
1716 struct device_node *np = ddata->dev->of_node;
1717 struct property *prop;
1718 const __be32 *p;
1719 u32 val;
1720
1721 of_property_for_each_u32(np, name, prop, p, val) {
1722 if (val >= SYSC_NR_IDLEMODES) {
1723 dev_err(ddata->dev, "invalid idlemode: %i\n", val);
1724 return -EINVAL;
1725 }
1726 *idlemodes |= (1 << val);
1727 }
1728
1729 return 0;
1730}
1731
1732static int sysc_init_idlemodes(struct sysc *ddata)
1733{
1734 int error;
1735
1736 error = sysc_init_idlemode(ddata, &ddata->cfg.midlemodes,
1737 "ti,sysc-midle");
1738 if (error)
1739 return error;
1740
1741 error = sysc_init_idlemode(ddata, &ddata->cfg.sidlemodes,
1742 "ti,sysc-sidle");
1743 if (error)
1744 return error;
1745
1746 return 0;
1747}
1748
1749/*
1750 * Only some devices on omap4 and later have SYSCONFIG reset done
1751 * bit. We can detect this if there is no SYSSTATUS at all, or the
1752 * SYSTATUS bit 0 is not used. Note that some SYSSTATUS registers
1753 * have multiple bits for the child devices like OHCI and EHCI.
1754 * Depends on SYSC being parsed first.
1755 */
1756static int sysc_init_syss_mask(struct sysc *ddata)
1757{
1758 struct device_node *np = ddata->dev->of_node;
1759 int error;
1760 u32 val;
1761
1762 error = of_property_read_u32(np, "ti,syss-mask", &val);
1763 if (error) {
1764 if ((ddata->cap->type == TI_SYSC_OMAP4 ||
1765 ddata->cap->type == TI_SYSC_OMAP4_TIMER) &&
1766 (ddata->cfg.sysc_val & SYSC_OMAP4_SOFTRESET))
1767 ddata->cfg.quirks |= SYSC_QUIRK_RESET_STATUS;
1768
1769 return 0;
1770 }
1771
1772 if (!(val & 1) && (ddata->cfg.sysc_val & SYSC_OMAP4_SOFTRESET))
1773 ddata->cfg.quirks |= SYSC_QUIRK_RESET_STATUS;
1774
1775 ddata->cfg.syss_mask = val;
1776
1777 return 0;
1778}
1779
1780/*
1781 * Many child device drivers need to have fck and opt clocks available
1782 * to get the clock rate for device internal configuration etc.
1783 */
1784static int sysc_child_add_named_clock(struct sysc *ddata,
1785 struct device *child,
1786 const char *name)
1787{
1788 struct clk *clk;
1789 struct clk_lookup *l;
1790 int error = 0;
1791
1792 if (!name)
1793 return 0;
1794
1795 clk = clk_get(child, name);
1796 if (!IS_ERR(clk)) {
1797 clk_put(clk);
1798
1799 return -EEXIST;
1800 }
1801
1802 clk = clk_get(ddata->dev, name);
1803 if (IS_ERR(clk))
1804 return -ENODEV;
1805
1806 l = clkdev_create(clk, name, dev_name(child));
1807 if (!l)
1808 error = -ENOMEM;
1809
1810 clk_put(clk);
1811
1812 return error;
1813}
1814
1815static int sysc_child_add_clocks(struct sysc *ddata,
1816 struct device *child)
1817{
1818 int i, error;
1819
1820 for (i = 0; i < ddata->nr_clocks; i++) {
1821 error = sysc_child_add_named_clock(ddata,
1822 child,
1823 ddata->clock_roles[i]);
1824 if (error && error != -EEXIST) {
1825 dev_err(ddata->dev, "could not add child clock %s: %i\n",
1826 ddata->clock_roles[i], error);
1827
1828 return error;
1829 }
1830 }
1831
1832 return 0;
1833}
1834
1835static struct device_type sysc_device_type = {
1836};
1837
1838static struct sysc *sysc_child_to_parent(struct device *dev)
1839{
1840 struct device *parent = dev->parent;
1841
1842 if (!parent || parent->type != &sysc_device_type)
1843 return NULL;
1844
1845 return dev_get_drvdata(parent);
1846}
1847
1848static int __maybe_unused sysc_child_runtime_suspend(struct device *dev)
1849{
1850 struct sysc *ddata;
1851 int error;
1852
1853 ddata = sysc_child_to_parent(dev);
1854
1855 error = pm_generic_runtime_suspend(dev);
1856 if (error)
1857 return error;
1858
1859 if (!ddata->enabled)
1860 return 0;
1861
1862 return sysc_runtime_suspend(ddata->dev);
1863}
1864
1865static int __maybe_unused sysc_child_runtime_resume(struct device *dev)
1866{
1867 struct sysc *ddata;
1868 int error;
1869
1870 ddata = sysc_child_to_parent(dev);
1871
1872 if (!ddata->enabled) {
1873 error = sysc_runtime_resume(ddata->dev);
1874 if (error < 0)
1875 dev_err(ddata->dev,
1876 "%s error: %i\n", __func__, error);
1877 }
1878
1879 return pm_generic_runtime_resume(dev);
1880}
1881
1882#ifdef CONFIG_PM_SLEEP
1883static int sysc_child_suspend_noirq(struct device *dev)
1884{
1885 struct sysc *ddata;
1886 int error;
1887
1888 ddata = sysc_child_to_parent(dev);
1889
1890 dev_dbg(ddata->dev, "%s %s\n", __func__,
1891 ddata->name ? ddata->name : "");
1892
1893 error = pm_generic_suspend_noirq(dev);
1894 if (error) {
1895 dev_err(dev, "%s error at %i: %i\n",
1896 __func__, __LINE__, error);
1897
1898 return error;
1899 }
1900
1901 if (!pm_runtime_status_suspended(dev)) {
1902 error = pm_generic_runtime_suspend(dev);
1903 if (error) {
1904 dev_dbg(dev, "%s busy at %i: %i\n",
1905 __func__, __LINE__, error);
1906
1907 return 0;
1908 }
1909
1910 error = sysc_runtime_suspend(ddata->dev);
1911 if (error) {
1912 dev_err(dev, "%s error at %i: %i\n",
1913 __func__, __LINE__, error);
1914
1915 return error;
1916 }
1917
1918 ddata->child_needs_resume = true;
1919 }
1920
1921 return 0;
1922}
1923
1924static int sysc_child_resume_noirq(struct device *dev)
1925{
1926 struct sysc *ddata;
1927 int error;
1928
1929 ddata = sysc_child_to_parent(dev);
1930
1931 dev_dbg(ddata->dev, "%s %s\n", __func__,
1932 ddata->name ? ddata->name : "");
1933
1934 if (ddata->child_needs_resume) {
1935 ddata->child_needs_resume = false;
1936
1937 error = sysc_runtime_resume(ddata->dev);
1938 if (error)
1939 dev_err(ddata->dev,
1940 "%s runtime resume error: %i\n",
1941 __func__, error);
1942
1943 error = pm_generic_runtime_resume(dev);
1944 if (error)
1945 dev_err(ddata->dev,
1946 "%s generic runtime resume: %i\n",
1947 __func__, error);
1948 }
1949
1950 return pm_generic_resume_noirq(dev);
1951}
1952#endif
1953
1954static struct dev_pm_domain sysc_child_pm_domain = {
1955 .ops = {
1956 SET_RUNTIME_PM_OPS(sysc_child_runtime_suspend,
1957 sysc_child_runtime_resume,
1958 NULL)
1959 USE_PLATFORM_PM_SLEEP_OPS
1960 SET_NOIRQ_SYSTEM_SLEEP_PM_OPS(sysc_child_suspend_noirq,
1961 sysc_child_resume_noirq)
1962 }
1963};
1964
1965/**
1966 * sysc_legacy_idle_quirk - handle children in omap_device compatible way
1967 * @ddata: device driver data
1968 * @child: child device driver
1969 *
1970 * Allow idle for child devices as done with _od_runtime_suspend().
1971 * Otherwise many child devices will not idle because of the permanent
1972 * parent usecount set in pm_runtime_irq_safe().
1973 *
1974 * Note that the long term solution is to just modify the child device
1975 * drivers to not set pm_runtime_irq_safe() and then this can be just
1976 * dropped.
1977 */
1978static void sysc_legacy_idle_quirk(struct sysc *ddata, struct device *child)
1979{
1980 if (ddata->cfg.quirks & SYSC_QUIRK_LEGACY_IDLE)
1981 dev_pm_domain_set(child, &sysc_child_pm_domain);
1982}
1983
1984static int sysc_notifier_call(struct notifier_block *nb,
1985 unsigned long event, void *device)
1986{
1987 struct device *dev = device;
1988 struct sysc *ddata;
1989 int error;
1990
1991 ddata = sysc_child_to_parent(dev);
1992 if (!ddata)
1993 return NOTIFY_DONE;
1994
1995 switch (event) {
1996 case BUS_NOTIFY_ADD_DEVICE:
1997 error = sysc_child_add_clocks(ddata, dev);
1998 if (error)
1999 return error;
2000 sysc_legacy_idle_quirk(ddata, dev);
2001 break;
2002 default:
2003 break;
2004 }
2005
2006 return NOTIFY_DONE;
2007}
2008
2009static struct notifier_block sysc_nb = {
2010 .notifier_call = sysc_notifier_call,
2011};
2012
2013/* Device tree configured quirks */
2014struct sysc_dts_quirk {
2015 const char *name;
2016 u32 mask;
2017};
2018
2019static const struct sysc_dts_quirk sysc_dts_quirks[] = {
2020 { .name = "ti,no-idle-on-init",
2021 .mask = SYSC_QUIRK_NO_IDLE_ON_INIT, },
2022 { .name = "ti,no-reset-on-init",
2023 .mask = SYSC_QUIRK_NO_RESET_ON_INIT, },
2024 { .name = "ti,no-idle",
2025 .mask = SYSC_QUIRK_NO_IDLE, },
2026};
2027
2028static void sysc_parse_dts_quirks(struct sysc *ddata, struct device_node *np,
2029 bool is_child)
2030{
2031 const struct property *prop;
2032 int i, len;
2033
2034 for (i = 0; i < ARRAY_SIZE(sysc_dts_quirks); i++) {
2035 const char *name = sysc_dts_quirks[i].name;
2036
2037 prop = of_get_property(np, name, &len);
2038 if (!prop)
2039 continue;
2040
2041 ddata->cfg.quirks |= sysc_dts_quirks[i].mask;
2042 if (is_child) {
2043 dev_warn(ddata->dev,
2044 "dts flag should be at module level for %s\n",
2045 name);
2046 }
2047 }
2048}
2049
2050static int sysc_init_dts_quirks(struct sysc *ddata)
2051{
2052 struct device_node *np = ddata->dev->of_node;
2053 int error;
2054 u32 val;
2055
2056 ddata->legacy_mode = of_get_property(np, "ti,hwmods", NULL);
2057
2058 sysc_parse_dts_quirks(ddata, np, false);
2059 error = of_property_read_u32(np, "ti,sysc-delay-us", &val);
2060 if (!error) {
2061 if (val > 255) {
2062 dev_warn(ddata->dev, "bad ti,sysc-delay-us: %i\n",
2063 val);
2064 }
2065
2066 ddata->cfg.srst_udelay = (u8)val;
2067 }
2068
2069 return 0;
2070}
2071
2072static void sysc_unprepare(struct sysc *ddata)
2073{
2074 int i;
2075
2076 if (!ddata->clocks)
2077 return;
2078
2079 for (i = 0; i < SYSC_MAX_CLOCKS; i++) {
2080 if (!IS_ERR_OR_NULL(ddata->clocks[i]))
2081 clk_unprepare(ddata->clocks[i]);
2082 }
2083}
2084
2085/*
2086 * Common sysc register bits found on omap2, also known as type1
2087 */
2088static const struct sysc_regbits sysc_regbits_omap2 = {
2089 .dmadisable_shift = -ENODEV,
2090 .midle_shift = 12,
2091 .sidle_shift = 3,
2092 .clkact_shift = 8,
2093 .emufree_shift = 5,
2094 .enwkup_shift = 2,
2095 .srst_shift = 1,
2096 .autoidle_shift = 0,
2097};
2098
2099static const struct sysc_capabilities sysc_omap2 = {
2100 .type = TI_SYSC_OMAP2,
2101 .sysc_mask = SYSC_OMAP2_CLOCKACTIVITY | SYSC_OMAP2_EMUFREE |
2102 SYSC_OMAP2_ENAWAKEUP | SYSC_OMAP2_SOFTRESET |
2103 SYSC_OMAP2_AUTOIDLE,
2104 .regbits = &sysc_regbits_omap2,
2105};
2106
2107/* All omap2 and 3 timers, and timers 1, 2 & 10 on omap 4 and 5 */
2108static const struct sysc_capabilities sysc_omap2_timer = {
2109 .type = TI_SYSC_OMAP2_TIMER,
2110 .sysc_mask = SYSC_OMAP2_CLOCKACTIVITY | SYSC_OMAP2_EMUFREE |
2111 SYSC_OMAP2_ENAWAKEUP | SYSC_OMAP2_SOFTRESET |
2112 SYSC_OMAP2_AUTOIDLE,
2113 .regbits = &sysc_regbits_omap2,
2114 .mod_quirks = SYSC_QUIRK_USE_CLOCKACT,
2115};
2116
2117/*
2118 * SHAM2 (SHA1/MD5) sysc found on omap3, a variant of sysc_regbits_omap2
2119 * with different sidle position
2120 */
2121static const struct sysc_regbits sysc_regbits_omap3_sham = {
2122 .dmadisable_shift = -ENODEV,
2123 .midle_shift = -ENODEV,
2124 .sidle_shift = 4,
2125 .clkact_shift = -ENODEV,
2126 .enwkup_shift = -ENODEV,
2127 .srst_shift = 1,
2128 .autoidle_shift = 0,
2129 .emufree_shift = -ENODEV,
2130};
2131
2132static const struct sysc_capabilities sysc_omap3_sham = {
2133 .type = TI_SYSC_OMAP3_SHAM,
2134 .sysc_mask = SYSC_OMAP2_SOFTRESET | SYSC_OMAP2_AUTOIDLE,
2135 .regbits = &sysc_regbits_omap3_sham,
2136};
2137
2138/*
2139 * AES register bits found on omap3 and later, a variant of
2140 * sysc_regbits_omap2 with different sidle position
2141 */
2142static const struct sysc_regbits sysc_regbits_omap3_aes = {
2143 .dmadisable_shift = -ENODEV,
2144 .midle_shift = -ENODEV,
2145 .sidle_shift = 6,
2146 .clkact_shift = -ENODEV,
2147 .enwkup_shift = -ENODEV,
2148 .srst_shift = 1,
2149 .autoidle_shift = 0,
2150 .emufree_shift = -ENODEV,
2151};
2152
2153static const struct sysc_capabilities sysc_omap3_aes = {
2154 .type = TI_SYSC_OMAP3_AES,
2155 .sysc_mask = SYSC_OMAP2_SOFTRESET | SYSC_OMAP2_AUTOIDLE,
2156 .regbits = &sysc_regbits_omap3_aes,
2157};
2158
2159/*
2160 * Common sysc register bits found on omap4, also known as type2
2161 */
2162static const struct sysc_regbits sysc_regbits_omap4 = {
2163 .dmadisable_shift = 16,
2164 .midle_shift = 4,
2165 .sidle_shift = 2,
2166 .clkact_shift = -ENODEV,
2167 .enwkup_shift = -ENODEV,
2168 .emufree_shift = 1,
2169 .srst_shift = 0,
2170 .autoidle_shift = -ENODEV,
2171};
2172
2173static const struct sysc_capabilities sysc_omap4 = {
2174 .type = TI_SYSC_OMAP4,
2175 .sysc_mask = SYSC_OMAP4_DMADISABLE | SYSC_OMAP4_FREEEMU |
2176 SYSC_OMAP4_SOFTRESET,
2177 .regbits = &sysc_regbits_omap4,
2178};
2179
2180static const struct sysc_capabilities sysc_omap4_timer = {
2181 .type = TI_SYSC_OMAP4_TIMER,
2182 .sysc_mask = SYSC_OMAP4_DMADISABLE | SYSC_OMAP4_FREEEMU |
2183 SYSC_OMAP4_SOFTRESET,
2184 .regbits = &sysc_regbits_omap4,
2185};
2186
2187/*
2188 * Common sysc register bits found on omap4, also known as type3
2189 */
2190static const struct sysc_regbits sysc_regbits_omap4_simple = {
2191 .dmadisable_shift = -ENODEV,
2192 .midle_shift = 2,
2193 .sidle_shift = 0,
2194 .clkact_shift = -ENODEV,
2195 .enwkup_shift = -ENODEV,
2196 .srst_shift = -ENODEV,
2197 .emufree_shift = -ENODEV,
2198 .autoidle_shift = -ENODEV,
2199};
2200
2201static const struct sysc_capabilities sysc_omap4_simple = {
2202 .type = TI_SYSC_OMAP4_SIMPLE,
2203 .regbits = &sysc_regbits_omap4_simple,
2204};
2205
2206/*
2207 * SmartReflex sysc found on omap34xx
2208 */
2209static const struct sysc_regbits sysc_regbits_omap34xx_sr = {
2210 .dmadisable_shift = -ENODEV,
2211 .midle_shift = -ENODEV,
2212 .sidle_shift = -ENODEV,
2213 .clkact_shift = 20,
2214 .enwkup_shift = -ENODEV,
2215 .srst_shift = -ENODEV,
2216 .emufree_shift = -ENODEV,
2217 .autoidle_shift = -ENODEV,
2218};
2219
2220static const struct sysc_capabilities sysc_34xx_sr = {
2221 .type = TI_SYSC_OMAP34XX_SR,
2222 .sysc_mask = SYSC_OMAP2_CLOCKACTIVITY,
2223 .regbits = &sysc_regbits_omap34xx_sr,
2224 .mod_quirks = SYSC_QUIRK_USE_CLOCKACT | SYSC_QUIRK_UNCACHED |
2225 SYSC_QUIRK_LEGACY_IDLE,
2226};
2227
2228/*
2229 * SmartReflex sysc found on omap36xx and later
2230 */
2231static const struct sysc_regbits sysc_regbits_omap36xx_sr = {
2232 .dmadisable_shift = -ENODEV,
2233 .midle_shift = -ENODEV,
2234 .sidle_shift = 24,
2235 .clkact_shift = -ENODEV,
2236 .enwkup_shift = 26,
2237 .srst_shift = -ENODEV,
2238 .emufree_shift = -ENODEV,
2239 .autoidle_shift = -ENODEV,
2240};
2241
2242static const struct sysc_capabilities sysc_36xx_sr = {
2243 .type = TI_SYSC_OMAP36XX_SR,
2244 .sysc_mask = SYSC_OMAP3_SR_ENAWAKEUP,
2245 .regbits = &sysc_regbits_omap36xx_sr,
2246 .mod_quirks = SYSC_QUIRK_UNCACHED | SYSC_QUIRK_LEGACY_IDLE,
2247};
2248
2249static const struct sysc_capabilities sysc_omap4_sr = {
2250 .type = TI_SYSC_OMAP4_SR,
2251 .regbits = &sysc_regbits_omap36xx_sr,
2252 .mod_quirks = SYSC_QUIRK_LEGACY_IDLE,
2253};
2254
2255/*
2256 * McASP register bits found on omap4 and later
2257 */
2258static const struct sysc_regbits sysc_regbits_omap4_mcasp = {
2259 .dmadisable_shift = -ENODEV,
2260 .midle_shift = -ENODEV,
2261 .sidle_shift = 0,
2262 .clkact_shift = -ENODEV,
2263 .enwkup_shift = -ENODEV,
2264 .srst_shift = -ENODEV,
2265 .emufree_shift = -ENODEV,
2266 .autoidle_shift = -ENODEV,
2267};
2268
2269static const struct sysc_capabilities sysc_omap4_mcasp = {
2270 .type = TI_SYSC_OMAP4_MCASP,
2271 .regbits = &sysc_regbits_omap4_mcasp,
2272 .mod_quirks = SYSC_QUIRK_OPT_CLKS_NEEDED,
2273};
2274
2275/*
2276 * McASP found on dra7 and later
2277 */
2278static const struct sysc_capabilities sysc_dra7_mcasp = {
2279 .type = TI_SYSC_OMAP4_SIMPLE,
2280 .regbits = &sysc_regbits_omap4_simple,
2281 .mod_quirks = SYSC_QUIRK_OPT_CLKS_NEEDED,
2282};
2283
2284/*
2285 * FS USB host found on omap4 and later
2286 */
2287static const struct sysc_regbits sysc_regbits_omap4_usb_host_fs = {
2288 .dmadisable_shift = -ENODEV,
2289 .midle_shift = -ENODEV,
2290 .sidle_shift = 24,
2291 .clkact_shift = -ENODEV,
2292 .enwkup_shift = 26,
2293 .srst_shift = -ENODEV,
2294 .emufree_shift = -ENODEV,
2295 .autoidle_shift = -ENODEV,
2296};
2297
2298static const struct sysc_capabilities sysc_omap4_usb_host_fs = {
2299 .type = TI_SYSC_OMAP4_USB_HOST_FS,
2300 .sysc_mask = SYSC_OMAP2_ENAWAKEUP,
2301 .regbits = &sysc_regbits_omap4_usb_host_fs,
2302};
2303
2304static const struct sysc_regbits sysc_regbits_dra7_mcan = {
2305 .dmadisable_shift = -ENODEV,
2306 .midle_shift = -ENODEV,
2307 .sidle_shift = -ENODEV,
2308 .clkact_shift = -ENODEV,
2309 .enwkup_shift = 4,
2310 .srst_shift = 0,
2311 .emufree_shift = -ENODEV,
2312 .autoidle_shift = -ENODEV,
2313};
2314
2315static const struct sysc_capabilities sysc_dra7_mcan = {
2316 .type = TI_SYSC_DRA7_MCAN,
2317 .sysc_mask = SYSC_DRA7_MCAN_ENAWAKEUP | SYSC_OMAP4_SOFTRESET,
2318 .regbits = &sysc_regbits_dra7_mcan,
2319 .mod_quirks = SYSS_QUIRK_RESETDONE_INVERTED,
2320};
2321
2322static int sysc_init_pdata(struct sysc *ddata)
2323{
2324 struct ti_sysc_platform_data *pdata = dev_get_platdata(ddata->dev);
2325 struct ti_sysc_module_data *mdata;
2326
2327 if (!pdata)
2328 return 0;
2329
2330 mdata = devm_kzalloc(ddata->dev, sizeof(*mdata), GFP_KERNEL);
2331 if (!mdata)
2332 return -ENOMEM;
2333
2334 if (ddata->legacy_mode) {
2335 mdata->name = ddata->legacy_mode;
2336 mdata->module_pa = ddata->module_pa;
2337 mdata->module_size = ddata->module_size;
2338 mdata->offsets = ddata->offsets;
2339 mdata->nr_offsets = SYSC_MAX_REGS;
2340 mdata->cap = ddata->cap;
2341 mdata->cfg = &ddata->cfg;
2342 }
2343
2344 ddata->mdata = mdata;
2345
2346 return 0;
2347}
2348
2349static int sysc_init_match(struct sysc *ddata)
2350{
2351 const struct sysc_capabilities *cap;
2352
2353 cap = of_device_get_match_data(ddata->dev);
2354 if (!cap)
2355 return -EINVAL;
2356
2357 ddata->cap = cap;
2358 if (ddata->cap)
2359 ddata->cfg.quirks |= ddata->cap->mod_quirks;
2360
2361 return 0;
2362}
2363
2364static void ti_sysc_idle(struct work_struct *work)
2365{
2366 struct sysc *ddata;
2367
2368 ddata = container_of(work, struct sysc, idle_work.work);
2369
2370 /*
2371 * One time decrement of clock usage counts if left on from init.
2372 * Note that we disable opt clocks unconditionally in this case
2373 * as they are enabled unconditionally during init without
2374 * considering sysc_opt_clks_needed() at that point.
2375 */
2376 if (ddata->cfg.quirks & (SYSC_QUIRK_NO_IDLE |
2377 SYSC_QUIRK_NO_IDLE_ON_INIT)) {
2378 sysc_disable_main_clocks(ddata);
2379 sysc_disable_opt_clocks(ddata);
2380 sysc_clkdm_allow_idle(ddata);
2381 }
2382
2383 /* Keep permanent PM runtime usage count for SYSC_QUIRK_NO_IDLE */
2384 if (ddata->cfg.quirks & SYSC_QUIRK_NO_IDLE)
2385 return;
2386
2387 /*
2388 * Decrement PM runtime usage count for SYSC_QUIRK_NO_IDLE_ON_INIT
2389 * and SYSC_QUIRK_NO_RESET_ON_INIT
2390 */
2391 if (pm_runtime_active(ddata->dev))
2392 pm_runtime_put_sync(ddata->dev);
2393}
2394
2395static const struct of_device_id sysc_match_table[] = {
2396 { .compatible = "simple-bus", },
2397 { /* sentinel */ },
2398};
2399
2400static int sysc_probe(struct platform_device *pdev)
2401{
2402 struct ti_sysc_platform_data *pdata = dev_get_platdata(&pdev->dev);
2403 struct sysc *ddata;
2404 int error;
2405
2406 ddata = devm_kzalloc(&pdev->dev, sizeof(*ddata), GFP_KERNEL);
2407 if (!ddata)
2408 return -ENOMEM;
2409
2410 ddata->dev = &pdev->dev;
2411 platform_set_drvdata(pdev, ddata);
2412
2413 error = sysc_init_match(ddata);
2414 if (error)
2415 return error;
2416
2417 error = sysc_init_dts_quirks(ddata);
2418 if (error)
2419 return error;
2420
2421 error = sysc_map_and_check_registers(ddata);
2422 if (error)
2423 return error;
2424
2425 error = sysc_init_sysc_mask(ddata);
2426 if (error)
2427 return error;
2428
2429 error = sysc_init_idlemodes(ddata);
2430 if (error)
2431 return error;
2432
2433 error = sysc_init_syss_mask(ddata);
2434 if (error)
2435 return error;
2436
2437 error = sysc_init_pdata(ddata);
2438 if (error)
2439 return error;
2440
2441 sysc_init_early_quirks(ddata);
2442
2443 error = sysc_get_clocks(ddata);
2444 if (error)
2445 return error;
2446
2447 error = sysc_init_resets(ddata);
2448 if (error)
2449 goto unprepare;
2450
2451 error = sysc_init_module(ddata);
2452 if (error)
2453 goto unprepare;
2454
2455 pm_runtime_enable(ddata->dev);
2456 error = pm_runtime_get_sync(ddata->dev);
2457 if (error < 0) {
2458 pm_runtime_put_noidle(ddata->dev);
2459 pm_runtime_disable(ddata->dev);
2460 goto unprepare;
2461 }
2462
2463 /* Balance reset counts */
2464 if (ddata->rsts)
2465 reset_control_assert(ddata->rsts);
2466
2467 sysc_show_registers(ddata);
2468
2469 ddata->dev->type = &sysc_device_type;
2470 error = of_platform_populate(ddata->dev->of_node, sysc_match_table,
2471 pdata ? pdata->auxdata : NULL,
2472 ddata->dev);
2473 if (error)
2474 goto err;
2475
2476 INIT_DELAYED_WORK(&ddata->idle_work, ti_sysc_idle);
2477
2478 /* At least earlycon won't survive without deferred idle */
2479 if (ddata->cfg.quirks & (SYSC_QUIRK_NO_IDLE |
2480 SYSC_QUIRK_NO_IDLE_ON_INIT |
2481 SYSC_QUIRK_NO_RESET_ON_INIT)) {
2482 schedule_delayed_work(&ddata->idle_work, 3000);
2483 } else {
2484 pm_runtime_put(&pdev->dev);
2485 }
2486
2487 return 0;
2488
2489err:
2490 pm_runtime_put_sync(&pdev->dev);
2491 pm_runtime_disable(&pdev->dev);
2492unprepare:
2493 sysc_unprepare(ddata);
2494
2495 return error;
2496}
2497
2498static int sysc_remove(struct platform_device *pdev)
2499{
2500 struct sysc *ddata = platform_get_drvdata(pdev);
2501 int error;
2502
2503 cancel_delayed_work_sync(&ddata->idle_work);
2504
2505 error = pm_runtime_get_sync(ddata->dev);
2506 if (error < 0) {
2507 pm_runtime_put_noidle(ddata->dev);
2508 pm_runtime_disable(ddata->dev);
2509 goto unprepare;
2510 }
2511
2512 of_platform_depopulate(&pdev->dev);
2513
2514 pm_runtime_put_sync(&pdev->dev);
2515 pm_runtime_disable(&pdev->dev);
2516 reset_control_assert(ddata->rsts);
2517
2518unprepare:
2519 sysc_unprepare(ddata);
2520
2521 return 0;
2522}
2523
2524static const struct of_device_id sysc_match[] = {
2525 { .compatible = "ti,sysc-omap2", .data = &sysc_omap2, },
2526 { .compatible = "ti,sysc-omap2-timer", .data = &sysc_omap2_timer, },
2527 { .compatible = "ti,sysc-omap4", .data = &sysc_omap4, },
2528 { .compatible = "ti,sysc-omap4-timer", .data = &sysc_omap4_timer, },
2529 { .compatible = "ti,sysc-omap4-simple", .data = &sysc_omap4_simple, },
2530 { .compatible = "ti,sysc-omap3430-sr", .data = &sysc_34xx_sr, },
2531 { .compatible = "ti,sysc-omap3630-sr", .data = &sysc_36xx_sr, },
2532 { .compatible = "ti,sysc-omap4-sr", .data = &sysc_omap4_sr, },
2533 { .compatible = "ti,sysc-omap3-sham", .data = &sysc_omap3_sham, },
2534 { .compatible = "ti,sysc-omap-aes", .data = &sysc_omap3_aes, },
2535 { .compatible = "ti,sysc-mcasp", .data = &sysc_omap4_mcasp, },
2536 { .compatible = "ti,sysc-dra7-mcasp", .data = &sysc_dra7_mcasp, },
2537 { .compatible = "ti,sysc-usb-host-fs",
2538 .data = &sysc_omap4_usb_host_fs, },
2539 { .compatible = "ti,sysc-dra7-mcan", .data = &sysc_dra7_mcan, },
2540 { },
2541};
2542MODULE_DEVICE_TABLE(of, sysc_match);
2543
2544static struct platform_driver sysc_driver = {
2545 .probe = sysc_probe,
2546 .remove = sysc_remove,
2547 .driver = {
2548 .name = "ti-sysc",
2549 .of_match_table = sysc_match,
2550 .pm = &sysc_pm_ops,
2551 },
2552};
2553
2554static int __init sysc_init(void)
2555{
2556 bus_register_notifier(&platform_bus_type, &sysc_nb);
2557
2558 return platform_driver_register(&sysc_driver);
2559}
2560module_init(sysc_init);
2561
2562static void __exit sysc_exit(void)
2563{
2564 bus_unregister_notifier(&platform_bus_type, &sysc_nb);
2565 platform_driver_unregister(&sysc_driver);
2566}
2567module_exit(sysc_exit);
2568
2569MODULE_DESCRIPTION("TI sysc interconnect target driver");
2570MODULE_LICENSE("GPL v2");