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
sysc_write(struct sysc * ddata,int offset,u32 value)94 void sysc_write(struct sysc *ddata, int offset, u32 value)
95 {
96 writel_relaxed(value, ddata->module_va + offset);
97 }
98
sysc_read(struct sysc * ddata,int offset)99 static u32 sysc_read(struct sysc *ddata, int offset)
100 {
101 if (ddata->cfg.quirks & SYSC_QUIRK_16BIT) {
102 u32 val;
103
104 val = readw_relaxed(ddata->module_va + offset);
105 val |= (readw_relaxed(ddata->module_va + offset + 4) << 16);
106
107 return val;
108 }
109
110 return readl_relaxed(ddata->module_va + offset);
111 }
112
sysc_opt_clks_needed(struct sysc * ddata)113 static bool sysc_opt_clks_needed(struct sysc *ddata)
114 {
115 return !!(ddata->cfg.quirks & SYSC_QUIRK_OPT_CLKS_NEEDED);
116 }
117
sysc_read_revision(struct sysc * ddata)118 static u32 sysc_read_revision(struct sysc *ddata)
119 {
120 int offset = ddata->offsets[SYSC_REVISION];
121
122 if (offset < 0)
123 return 0;
124
125 return sysc_read(ddata, offset);
126 }
127
sysc_get_one_clock(struct sysc * ddata,const char * name)128 static int sysc_get_one_clock(struct sysc *ddata, const char *name)
129 {
130 int error, i, index = -ENODEV;
131
132 if (!strncmp(clock_names[SYSC_FCK], name, 3))
133 index = SYSC_FCK;
134 else if (!strncmp(clock_names[SYSC_ICK], name, 3))
135 index = SYSC_ICK;
136
137 if (index < 0) {
138 for (i = SYSC_OPTFCK0; i < SYSC_MAX_CLOCKS; i++) {
139 if (!ddata->clocks[i]) {
140 index = i;
141 break;
142 }
143 }
144 }
145
146 if (index < 0) {
147 dev_err(ddata->dev, "clock %s not added\n", name);
148 return index;
149 }
150
151 ddata->clocks[index] = devm_clk_get(ddata->dev, name);
152 if (IS_ERR(ddata->clocks[index])) {
153 if (PTR_ERR(ddata->clocks[index]) == -ENOENT)
154 return 0;
155
156 dev_err(ddata->dev, "clock get error for %s: %li\n",
157 name, PTR_ERR(ddata->clocks[index]));
158
159 return PTR_ERR(ddata->clocks[index]);
160 }
161
162 error = clk_prepare(ddata->clocks[index]);
163 if (error) {
164 dev_err(ddata->dev, "clock prepare error for %s: %i\n",
165 name, error);
166
167 return error;
168 }
169
170 return 0;
171 }
172
sysc_get_clocks(struct sysc * ddata)173 static int sysc_get_clocks(struct sysc *ddata)
174 {
175 struct device_node *np = ddata->dev->of_node;
176 struct property *prop;
177 const char *name;
178 int nr_fck = 0, nr_ick = 0, i, error = 0;
179
180 ddata->clock_roles = devm_kcalloc(ddata->dev,
181 SYSC_MAX_CLOCKS,
182 sizeof(*ddata->clock_roles),
183 GFP_KERNEL);
184 if (!ddata->clock_roles)
185 return -ENOMEM;
186
187 of_property_for_each_string(np, "clock-names", prop, name) {
188 if (!strncmp(clock_names[SYSC_FCK], name, 3))
189 nr_fck++;
190 if (!strncmp(clock_names[SYSC_ICK], name, 3))
191 nr_ick++;
192 ddata->clock_roles[ddata->nr_clocks] = name;
193 ddata->nr_clocks++;
194 }
195
196 if (ddata->nr_clocks < 1)
197 return 0;
198
199 if (ddata->nr_clocks > SYSC_MAX_CLOCKS) {
200 dev_err(ddata->dev, "too many clocks for %pOF\n", np);
201
202 return -EINVAL;
203 }
204
205 if (nr_fck > 1 || nr_ick > 1) {
206 dev_err(ddata->dev, "max one fck and ick for %pOF\n", np);
207
208 return -EINVAL;
209 }
210
211 ddata->clocks = devm_kcalloc(ddata->dev,
212 ddata->nr_clocks, sizeof(*ddata->clocks),
213 GFP_KERNEL);
214 if (!ddata->clocks)
215 return -ENOMEM;
216
217 for (i = 0; i < ddata->nr_clocks; i++) {
218 error = sysc_get_one_clock(ddata, ddata->clock_roles[i]);
219 if (error && error != -ENOENT)
220 return error;
221 }
222
223 return 0;
224 }
225
226 /**
227 * sysc_init_resets - reset module on init
228 * @ddata: device driver data
229 *
230 * A module can have both OCP softreset control and external rstctrl.
231 * If more complicated rstctrl resets are needed, please handle these
232 * directly from the child device driver and map only the module reset
233 * for the parent interconnect target module device.
234 *
235 * Automatic reset of the module on init can be skipped with the
236 * "ti,no-reset-on-init" device tree property.
237 */
sysc_init_resets(struct sysc * ddata)238 static int sysc_init_resets(struct sysc *ddata)
239 {
240 int error;
241
242 ddata->rsts =
243 devm_reset_control_array_get_optional_exclusive(ddata->dev);
244 if (IS_ERR(ddata->rsts))
245 return PTR_ERR(ddata->rsts);
246
247 if (ddata->cfg.quirks & SYSC_QUIRK_NO_RESET_ON_INIT)
248 goto deassert;
249
250 error = reset_control_assert(ddata->rsts);
251 if (error)
252 return error;
253
254 deassert:
255 error = reset_control_deassert(ddata->rsts);
256 if (error)
257 return error;
258
259 return 0;
260 }
261
262 /**
263 * sysc_parse_and_check_child_range - parses module IO region from ranges
264 * @ddata: device driver data
265 *
266 * In general we only need rev, syss, and sysc registers and not the whole
267 * module range. But we do want the offsets for these registers from the
268 * module base. This allows us to check them against the legacy hwmod
269 * platform data. Let's also check the ranges are configured properly.
270 */
sysc_parse_and_check_child_range(struct sysc * ddata)271 static int sysc_parse_and_check_child_range(struct sysc *ddata)
272 {
273 struct device_node *np = ddata->dev->of_node;
274 const __be32 *ranges;
275 u32 nr_addr, nr_size;
276 int len, error;
277
278 ranges = of_get_property(np, "ranges", &len);
279 if (!ranges) {
280 dev_err(ddata->dev, "missing ranges for %pOF\n", np);
281
282 return -ENOENT;
283 }
284
285 len /= sizeof(*ranges);
286
287 if (len < 3) {
288 dev_err(ddata->dev, "incomplete ranges for %pOF\n", np);
289
290 return -EINVAL;
291 }
292
293 error = of_property_read_u32(np, "#address-cells", &nr_addr);
294 if (error)
295 return -ENOENT;
296
297 error = of_property_read_u32(np, "#size-cells", &nr_size);
298 if (error)
299 return -ENOENT;
300
301 if (nr_addr != 1 || nr_size != 1) {
302 dev_err(ddata->dev, "invalid ranges for %pOF\n", np);
303
304 return -EINVAL;
305 }
306
307 ranges++;
308 ddata->module_pa = of_translate_address(np, ranges++);
309 ddata->module_size = be32_to_cpup(ranges);
310
311 return 0;
312 }
313
314 static struct device_node *stdout_path;
315
sysc_init_stdout_path(struct sysc * ddata)316 static void sysc_init_stdout_path(struct sysc *ddata)
317 {
318 struct device_node *np = NULL;
319 const char *uart;
320
321 if (IS_ERR(stdout_path))
322 return;
323
324 if (stdout_path)
325 return;
326
327 np = of_find_node_by_path("/chosen");
328 if (!np)
329 goto err;
330
331 uart = of_get_property(np, "stdout-path", NULL);
332 if (!uart)
333 goto err;
334
335 np = of_find_node_by_path(uart);
336 if (!np)
337 goto err;
338
339 stdout_path = np;
340
341 return;
342
343 err:
344 stdout_path = ERR_PTR(-ENODEV);
345 }
346
sysc_check_quirk_stdout(struct sysc * ddata,struct device_node * np)347 static void sysc_check_quirk_stdout(struct sysc *ddata,
348 struct device_node *np)
349 {
350 sysc_init_stdout_path(ddata);
351 if (np != stdout_path)
352 return;
353
354 ddata->cfg.quirks |= SYSC_QUIRK_NO_IDLE_ON_INIT |
355 SYSC_QUIRK_NO_RESET_ON_INIT;
356 }
357
358 /**
359 * sysc_check_one_child - check child configuration
360 * @ddata: device driver data
361 * @np: child device node
362 *
363 * Let's avoid messy situations where we have new interconnect target
364 * node but children have "ti,hwmods". These belong to the interconnect
365 * target node and are managed by this driver.
366 */
sysc_check_one_child(struct sysc * ddata,struct device_node * np)367 static int sysc_check_one_child(struct sysc *ddata,
368 struct device_node *np)
369 {
370 const char *name;
371
372 name = of_get_property(np, "ti,hwmods", NULL);
373 if (name)
374 dev_warn(ddata->dev, "really a child ti,hwmods property?");
375
376 sysc_check_quirk_stdout(ddata, np);
377
378 return 0;
379 }
380
sysc_check_children(struct sysc * ddata)381 static int sysc_check_children(struct sysc *ddata)
382 {
383 struct device_node *child;
384 int error;
385
386 for_each_child_of_node(ddata->dev->of_node, child) {
387 error = sysc_check_one_child(ddata, child);
388 if (error)
389 return error;
390 }
391
392 return 0;
393 }
394
395 /*
396 * So far only I2C uses 16-bit read access with clockactivity with revision
397 * in two registers with stride of 4. We can detect this based on the rev
398 * register size to configure things far enough to be able to properly read
399 * the revision register.
400 */
sysc_check_quirk_16bit(struct sysc * ddata,struct resource * res)401 static void sysc_check_quirk_16bit(struct sysc *ddata, struct resource *res)
402 {
403 if (resource_size(res) == 8)
404 ddata->cfg.quirks |= SYSC_QUIRK_16BIT | SYSC_QUIRK_USE_CLOCKACT;
405 }
406
407 /**
408 * sysc_parse_one - parses the interconnect target module registers
409 * @ddata: device driver data
410 * @reg: register to parse
411 */
sysc_parse_one(struct sysc * ddata,enum sysc_registers reg)412 static int sysc_parse_one(struct sysc *ddata, enum sysc_registers reg)
413 {
414 struct resource *res;
415 const char *name;
416
417 switch (reg) {
418 case SYSC_REVISION:
419 case SYSC_SYSCONFIG:
420 case SYSC_SYSSTATUS:
421 name = reg_names[reg];
422 break;
423 default:
424 return -EINVAL;
425 }
426
427 res = platform_get_resource_byname(to_platform_device(ddata->dev),
428 IORESOURCE_MEM, name);
429 if (!res) {
430 ddata->offsets[reg] = -ENODEV;
431
432 return 0;
433 }
434
435 ddata->offsets[reg] = res->start - ddata->module_pa;
436 if (reg == SYSC_REVISION)
437 sysc_check_quirk_16bit(ddata, res);
438
439 return 0;
440 }
441
sysc_parse_registers(struct sysc * ddata)442 static int sysc_parse_registers(struct sysc *ddata)
443 {
444 int i, error;
445
446 for (i = 0; i < SYSC_MAX_REGS; i++) {
447 error = sysc_parse_one(ddata, i);
448 if (error)
449 return error;
450 }
451
452 return 0;
453 }
454
455 /**
456 * sysc_check_registers - check for misconfigured register overlaps
457 * @ddata: device driver data
458 */
sysc_check_registers(struct sysc * ddata)459 static int sysc_check_registers(struct sysc *ddata)
460 {
461 int i, j, nr_regs = 0, nr_matches = 0;
462
463 for (i = 0; i < SYSC_MAX_REGS; i++) {
464 if (ddata->offsets[i] < 0)
465 continue;
466
467 if (ddata->offsets[i] > (ddata->module_size - 4)) {
468 dev_err(ddata->dev, "register outside module range");
469
470 return -EINVAL;
471 }
472
473 for (j = 0; j < SYSC_MAX_REGS; j++) {
474 if (ddata->offsets[j] < 0)
475 continue;
476
477 if (ddata->offsets[i] == ddata->offsets[j])
478 nr_matches++;
479 }
480 nr_regs++;
481 }
482
483 if (nr_regs < 1) {
484 dev_err(ddata->dev, "missing registers\n");
485
486 return -EINVAL;
487 }
488
489 if (nr_matches > nr_regs) {
490 dev_err(ddata->dev, "overlapping registers: (%i/%i)",
491 nr_regs, nr_matches);
492
493 return -EINVAL;
494 }
495
496 return 0;
497 }
498
499 /**
500 * syc_ioremap - ioremap register space for the interconnect target module
501 * @ddata: device driver data
502 *
503 * Note that the interconnect target module registers can be anywhere
504 * within the interconnect target module range. For example, SGX has
505 * them at offset 0x1fc00 in the 32MB module address space. And cpsw
506 * has them at offset 0x1200 in the CPSW_WR child. Usually the
507 * the interconnect target module registers are at the beginning of
508 * the module range though.
509 */
sysc_ioremap(struct sysc * ddata)510 static int sysc_ioremap(struct sysc *ddata)
511 {
512 int size;
513
514 size = max3(ddata->offsets[SYSC_REVISION],
515 ddata->offsets[SYSC_SYSCONFIG],
516 ddata->offsets[SYSC_SYSSTATUS]);
517
518 if (size < 0 || (size + sizeof(u32)) > ddata->module_size)
519 return -EINVAL;
520
521 ddata->module_va = devm_ioremap(ddata->dev,
522 ddata->module_pa,
523 size + sizeof(u32));
524 if (!ddata->module_va)
525 return -EIO;
526
527 return 0;
528 }
529
530 /**
531 * sysc_map_and_check_registers - ioremap and check device registers
532 * @ddata: device driver data
533 */
sysc_map_and_check_registers(struct sysc * ddata)534 static int sysc_map_and_check_registers(struct sysc *ddata)
535 {
536 int error;
537
538 error = sysc_parse_and_check_child_range(ddata);
539 if (error)
540 return error;
541
542 error = sysc_check_children(ddata);
543 if (error)
544 return error;
545
546 error = sysc_parse_registers(ddata);
547 if (error)
548 return error;
549
550 error = sysc_ioremap(ddata);
551 if (error)
552 return error;
553
554 error = sysc_check_registers(ddata);
555 if (error)
556 return error;
557
558 return 0;
559 }
560
561 /**
562 * sysc_show_rev - read and show interconnect target module revision
563 * @bufp: buffer to print the information to
564 * @ddata: device driver data
565 */
sysc_show_rev(char * bufp,struct sysc * ddata)566 static int sysc_show_rev(char *bufp, struct sysc *ddata)
567 {
568 int len;
569
570 if (ddata->offsets[SYSC_REVISION] < 0)
571 return sprintf(bufp, ":NA");
572
573 len = sprintf(bufp, ":%08x", ddata->revision);
574
575 return len;
576 }
577
sysc_show_reg(struct sysc * ddata,char * bufp,enum sysc_registers reg)578 static int sysc_show_reg(struct sysc *ddata,
579 char *bufp, enum sysc_registers reg)
580 {
581 if (ddata->offsets[reg] < 0)
582 return sprintf(bufp, ":NA");
583
584 return sprintf(bufp, ":%x", ddata->offsets[reg]);
585 }
586
sysc_show_name(char * bufp,struct sysc * ddata)587 static int sysc_show_name(char *bufp, struct sysc *ddata)
588 {
589 if (!ddata->name)
590 return 0;
591
592 return sprintf(bufp, ":%s", ddata->name);
593 }
594
595 /**
596 * sysc_show_registers - show information about interconnect target module
597 * @ddata: device driver data
598 */
sysc_show_registers(struct sysc * ddata)599 static void sysc_show_registers(struct sysc *ddata)
600 {
601 char buf[128];
602 char *bufp = buf;
603 int i;
604
605 for (i = 0; i < SYSC_MAX_REGS; i++)
606 bufp += sysc_show_reg(ddata, bufp, i);
607
608 bufp += sysc_show_rev(bufp, ddata);
609 bufp += sysc_show_name(bufp, ddata);
610
611 dev_dbg(ddata->dev, "%llx:%x%s\n",
612 ddata->module_pa, ddata->module_size,
613 buf);
614 }
615
sysc_runtime_suspend(struct device * dev)616 static int __maybe_unused sysc_runtime_suspend(struct device *dev)
617 {
618 struct ti_sysc_platform_data *pdata;
619 struct sysc *ddata;
620 int error = 0, i;
621
622 ddata = dev_get_drvdata(dev);
623
624 if (!ddata->enabled)
625 return 0;
626
627 if (ddata->legacy_mode) {
628 pdata = dev_get_platdata(ddata->dev);
629 if (!pdata)
630 return 0;
631
632 if (!pdata->idle_module)
633 return -ENODEV;
634
635 error = pdata->idle_module(dev, &ddata->cookie);
636 if (error)
637 dev_err(dev, "%s: could not idle: %i\n",
638 __func__, error);
639
640 goto idled;
641 }
642
643 for (i = 0; i < ddata->nr_clocks; i++) {
644 if (IS_ERR_OR_NULL(ddata->clocks[i]))
645 continue;
646
647 if (i >= SYSC_OPTFCK0 && !sysc_opt_clks_needed(ddata))
648 break;
649
650 clk_disable(ddata->clocks[i]);
651 }
652
653 idled:
654 ddata->enabled = false;
655
656 return error;
657 }
658
sysc_runtime_resume(struct device * dev)659 static int __maybe_unused sysc_runtime_resume(struct device *dev)
660 {
661 struct ti_sysc_platform_data *pdata;
662 struct sysc *ddata;
663 int error = 0, i;
664
665 ddata = dev_get_drvdata(dev);
666
667 if (ddata->enabled)
668 return 0;
669
670 if (ddata->legacy_mode) {
671 pdata = dev_get_platdata(ddata->dev);
672 if (!pdata)
673 return 0;
674
675 if (!pdata->enable_module)
676 return -ENODEV;
677
678 error = pdata->enable_module(dev, &ddata->cookie);
679 if (error)
680 dev_err(dev, "%s: could not enable: %i\n",
681 __func__, error);
682
683 goto awake;
684 }
685
686 for (i = 0; i < ddata->nr_clocks; i++) {
687 if (IS_ERR_OR_NULL(ddata->clocks[i]))
688 continue;
689
690 if (i >= SYSC_OPTFCK0 && !sysc_opt_clks_needed(ddata))
691 break;
692
693 error = clk_enable(ddata->clocks[i]);
694 if (error)
695 return error;
696 }
697
698 awake:
699 ddata->enabled = true;
700
701 return error;
702 }
703
704 #ifdef CONFIG_PM_SLEEP
sysc_suspend(struct device * dev)705 static int sysc_suspend(struct device *dev)
706 {
707 struct sysc *ddata;
708 int error;
709
710 ddata = dev_get_drvdata(dev);
711
712 if (ddata->cfg.quirks & (SYSC_QUIRK_RESOURCE_PROVIDER |
713 SYSC_QUIRK_LEGACY_IDLE))
714 return 0;
715
716 if (!ddata->enabled)
717 return 0;
718
719 dev_dbg(ddata->dev, "%s %s\n", __func__,
720 ddata->name ? ddata->name : "");
721
722 error = pm_runtime_put_sync_suspend(dev);
723 if (error < 0) {
724 dev_warn(ddata->dev, "%s not idle %i %s\n",
725 __func__, error,
726 ddata->name ? ddata->name : "");
727
728 return 0;
729 }
730
731 ddata->needs_resume = true;
732
733 return 0;
734 }
735
sysc_resume(struct device * dev)736 static int sysc_resume(struct device *dev)
737 {
738 struct sysc *ddata;
739 int error;
740
741 ddata = dev_get_drvdata(dev);
742
743 if (ddata->cfg.quirks & (SYSC_QUIRK_RESOURCE_PROVIDER |
744 SYSC_QUIRK_LEGACY_IDLE))
745 return 0;
746
747 if (ddata->needs_resume) {
748 dev_dbg(ddata->dev, "%s %s\n", __func__,
749 ddata->name ? ddata->name : "");
750
751 error = pm_runtime_get_sync(dev);
752 if (error < 0) {
753 dev_err(ddata->dev, "%s error %i %s\n",
754 __func__, error,
755 ddata->name ? ddata->name : "");
756
757 return error;
758 }
759
760 ddata->needs_resume = false;
761 }
762
763 return 0;
764 }
765
sysc_noirq_suspend(struct device * dev)766 static int sysc_noirq_suspend(struct device *dev)
767 {
768 struct sysc *ddata;
769
770 ddata = dev_get_drvdata(dev);
771
772 if (ddata->cfg.quirks & SYSC_QUIRK_LEGACY_IDLE)
773 return 0;
774
775 if (!(ddata->cfg.quirks & SYSC_QUIRK_RESOURCE_PROVIDER))
776 return 0;
777
778 if (!ddata->enabled)
779 return 0;
780
781 dev_dbg(ddata->dev, "%s %s\n", __func__,
782 ddata->name ? ddata->name : "");
783
784 ddata->needs_resume = true;
785
786 return sysc_runtime_suspend(dev);
787 }
788
sysc_noirq_resume(struct device * dev)789 static int sysc_noirq_resume(struct device *dev)
790 {
791 struct sysc *ddata;
792
793 ddata = dev_get_drvdata(dev);
794
795 if (ddata->cfg.quirks & SYSC_QUIRK_LEGACY_IDLE)
796 return 0;
797
798 if (!(ddata->cfg.quirks & SYSC_QUIRK_RESOURCE_PROVIDER))
799 return 0;
800
801 if (ddata->needs_resume) {
802 dev_dbg(ddata->dev, "%s %s\n", __func__,
803 ddata->name ? ddata->name : "");
804
805 ddata->needs_resume = false;
806
807 return sysc_runtime_resume(dev);
808 }
809
810 return 0;
811 }
812 #endif
813
814 static const struct dev_pm_ops sysc_pm_ops = {
815 SET_SYSTEM_SLEEP_PM_OPS(sysc_suspend, sysc_resume)
816 SET_NOIRQ_SYSTEM_SLEEP_PM_OPS(sysc_noirq_suspend, sysc_noirq_resume)
817 SET_RUNTIME_PM_OPS(sysc_runtime_suspend,
818 sysc_runtime_resume,
819 NULL)
820 };
821
822 /* Module revision register based quirks */
823 struct sysc_revision_quirk {
824 const char *name;
825 u32 base;
826 int rev_offset;
827 int sysc_offset;
828 int syss_offset;
829 u32 revision;
830 u32 revision_mask;
831 u32 quirks;
832 };
833
834 #define SYSC_QUIRK(optname, optbase, optrev, optsysc, optsyss, \
835 optrev_val, optrevmask, optquirkmask) \
836 { \
837 .name = (optname), \
838 .base = (optbase), \
839 .rev_offset = (optrev), \
840 .sysc_offset = (optsysc), \
841 .syss_offset = (optsyss), \
842 .revision = (optrev_val), \
843 .revision_mask = (optrevmask), \
844 .quirks = (optquirkmask), \
845 }
846
847 static const struct sysc_revision_quirk sysc_revision_quirks[] = {
848 /* These need to use noirq_suspend */
849 SYSC_QUIRK("control", 0, 0, 0x10, -1, 0x40000900, 0xffffffff,
850 SYSC_QUIRK_RESOURCE_PROVIDER),
851 SYSC_QUIRK("i2c", 0, 0, 0x10, 0x90, 0x5040000a, 0xffffffff,
852 SYSC_QUIRK_RESOURCE_PROVIDER),
853 SYSC_QUIRK("mcspi", 0, 0, 0x10, -1, 0x40300a0b, 0xffffffff,
854 SYSC_QUIRK_RESOURCE_PROVIDER),
855 SYSC_QUIRK("prcm", 0, 0, -1, -1, 0x40000100, 0xffffffff,
856 SYSC_QUIRK_RESOURCE_PROVIDER),
857 SYSC_QUIRK("ocp2scp", 0, 0, 0x10, 0x14, 0x50060005, 0xffffffff,
858 SYSC_QUIRK_RESOURCE_PROVIDER),
859 SYSC_QUIRK("padconf", 0, 0, 0x10, -1, 0x4fff0800, 0xffffffff,
860 SYSC_QUIRK_RESOURCE_PROVIDER),
861 SYSC_QUIRK("scm", 0, 0, 0x10, -1, 0x40000900, 0xffffffff,
862 SYSC_QUIRK_RESOURCE_PROVIDER),
863 SYSC_QUIRK("scrm", 0, 0, -1, -1, 0x00000010, 0xffffffff,
864 SYSC_QUIRK_RESOURCE_PROVIDER),
865 SYSC_QUIRK("sdma", 0, 0, 0x2c, 0x28, 0x00010900, 0xffffffff,
866 SYSC_QUIRK_RESOURCE_PROVIDER),
867
868 /* These drivers need to be fixed to not use pm_runtime_irq_safe() */
869 SYSC_QUIRK("gpio", 0, 0, 0x10, 0x114, 0x50600801, 0xffffffff,
870 SYSC_QUIRK_LEGACY_IDLE | SYSC_QUIRK_OPT_CLKS_IN_RESET),
871 SYSC_QUIRK("mmu", 0, 0, 0x10, 0x14, 0x00000020, 0xffffffff,
872 SYSC_QUIRK_LEGACY_IDLE),
873 SYSC_QUIRK("mmu", 0, 0, 0x10, 0x14, 0x00000030, 0xffffffff,
874 SYSC_QUIRK_LEGACY_IDLE),
875 SYSC_QUIRK("sham", 0, 0x100, 0x110, 0x114, 0x40000c03, 0xffffffff,
876 SYSC_QUIRK_LEGACY_IDLE),
877 SYSC_QUIRK("smartreflex", 0, -1, 0x24, -1, 0x00000000, 0xffffffff,
878 SYSC_QUIRK_LEGACY_IDLE),
879 SYSC_QUIRK("smartreflex", 0, -1, 0x38, -1, 0x00000000, 0xffffffff,
880 SYSC_QUIRK_LEGACY_IDLE),
881 SYSC_QUIRK("timer", 0, 0, 0x10, 0x14, 0x00000015, 0xffffffff,
882 SYSC_QUIRK_LEGACY_IDLE),
883 /* Some timers on omap4 and later */
884 SYSC_QUIRK("timer", 0, 0, 0x10, -1, 0x4fff1301, 0xffffffff,
885 SYSC_QUIRK_LEGACY_IDLE),
886 SYSC_QUIRK("uart", 0, 0x50, 0x54, 0x58, 0x00000052, 0xffffffff,
887 SYSC_QUIRK_LEGACY_IDLE),
888 /* Uarts on omap4 and later */
889 SYSC_QUIRK("uart", 0, 0x50, 0x54, 0x58, 0x50411e03, 0xffffffff,
890 SYSC_QUIRK_LEGACY_IDLE),
891
892 /* These devices don't yet suspend properly without legacy setting */
893 SYSC_QUIRK("sdio", 0, 0, 0x10, -1, 0x40202301, 0xffffffff,
894 SYSC_QUIRK_LEGACY_IDLE),
895 SYSC_QUIRK("wdt", 0, 0, 0x10, 0x14, 0x502a0500, 0xffffffff,
896 SYSC_QUIRK_LEGACY_IDLE),
897 SYSC_QUIRK("wdt", 0, 0, 0x10, 0x14, 0x502a0d00, 0xffffffff,
898 SYSC_QUIRK_LEGACY_IDLE),
899
900 #ifdef DEBUG
901 SYSC_QUIRK("aess", 0, 0, 0x10, -1, 0x40000000, 0xffffffff, 0),
902 SYSC_QUIRK("gpu", 0, 0x1fc00, 0x1fc10, -1, 0, 0, 0),
903 SYSC_QUIRK("hdq1w", 0, 0, 0x14, 0x18, 0x00000006, 0xffffffff, 0),
904 SYSC_QUIRK("hsi", 0, 0, 0x10, 0x14, 0x50043101, 0xffffffff, 0),
905 SYSC_QUIRK("iss", 0, 0, 0x10, -1, 0x40000101, 0xffffffff, 0),
906 SYSC_QUIRK("mcasp", 0, 0, 0x4, -1, 0x44306302, 0xffffffff, 0),
907 SYSC_QUIRK("mcbsp", 0, -1, 0x8c, -1, 0, 0, 0),
908 SYSC_QUIRK("mailbox", 0, 0, 0x10, -1, 0x00000400, 0xffffffff, 0),
909 SYSC_QUIRK("slimbus", 0, 0, 0x10, -1, 0x40000902, 0xffffffff, 0),
910 SYSC_QUIRK("slimbus", 0, 0, 0x10, -1, 0x40002903, 0xffffffff, 0),
911 SYSC_QUIRK("spinlock", 0, 0, 0x10, -1, 0x50020000, 0xffffffff, 0),
912 SYSC_QUIRK("usbhstll", 0, 0, 0x10, 0x14, 0x00000004, 0xffffffff, 0),
913 SYSC_QUIRK("usb_host_hs", 0, 0, 0x10, 0x14, 0x50700100, 0xffffffff, 0),
914 SYSC_QUIRK("usb_otg_hs", 0, 0x400, 0x404, 0x408, 0x00000050,
915 0xffffffff, 0),
916 #endif
917 };
918
sysc_init_revision_quirks(struct sysc * ddata)919 static void sysc_init_revision_quirks(struct sysc *ddata)
920 {
921 const struct sysc_revision_quirk *q;
922 int i;
923
924 for (i = 0; i < ARRAY_SIZE(sysc_revision_quirks); i++) {
925 q = &sysc_revision_quirks[i];
926
927 if (q->base && q->base != ddata->module_pa)
928 continue;
929
930 if (q->rev_offset >= 0 &&
931 q->rev_offset != ddata->offsets[SYSC_REVISION])
932 continue;
933
934 if (q->sysc_offset >= 0 &&
935 q->sysc_offset != ddata->offsets[SYSC_SYSCONFIG])
936 continue;
937
938 if (q->syss_offset >= 0 &&
939 q->syss_offset != ddata->offsets[SYSC_SYSSTATUS])
940 continue;
941
942 if (q->revision == ddata->revision ||
943 (q->revision & q->revision_mask) ==
944 (ddata->revision & q->revision_mask)) {
945 ddata->name = q->name;
946 ddata->cfg.quirks |= q->quirks;
947 }
948 }
949 }
950
sysc_reset(struct sysc * ddata)951 static int sysc_reset(struct sysc *ddata)
952 {
953 int offset = ddata->offsets[SYSC_SYSCONFIG];
954 int val;
955
956 if (ddata->legacy_mode || offset < 0 ||
957 ddata->cfg.quirks & SYSC_QUIRK_NO_RESET_ON_INIT)
958 return 0;
959
960 /*
961 * Currently only support reset status in sysstatus.
962 * Warn and return error in all other cases
963 */
964 if (!ddata->cfg.syss_mask) {
965 dev_err(ddata->dev, "No ti,syss-mask. Reset failed\n");
966 return -EINVAL;
967 }
968
969 val = sysc_read(ddata, offset);
970 val |= (0x1 << ddata->cap->regbits->srst_shift);
971 sysc_write(ddata, offset, val);
972
973 /* Poll on reset status */
974 offset = ddata->offsets[SYSC_SYSSTATUS];
975
976 return readl_poll_timeout(ddata->module_va + offset, val,
977 (val & ddata->cfg.syss_mask) == 0x0,
978 100, MAX_MODULE_SOFTRESET_WAIT);
979 }
980
981 /* At this point the module is configured enough to read the revision */
sysc_init_module(struct sysc * ddata)982 static int sysc_init_module(struct sysc *ddata)
983 {
984 int error;
985
986 if (ddata->cfg.quirks & SYSC_QUIRK_NO_IDLE_ON_INIT) {
987 ddata->revision = sysc_read_revision(ddata);
988 goto rev_quirks;
989 }
990
991 error = pm_runtime_get_sync(ddata->dev);
992 if (error < 0) {
993 pm_runtime_put_noidle(ddata->dev);
994
995 return 0;
996 }
997
998 error = sysc_reset(ddata);
999 if (error) {
1000 dev_err(ddata->dev, "Reset failed with %d\n", error);
1001 pm_runtime_put_sync(ddata->dev);
1002
1003 return error;
1004 }
1005
1006 ddata->revision = sysc_read_revision(ddata);
1007 pm_runtime_put_sync(ddata->dev);
1008
1009 rev_quirks:
1010 sysc_init_revision_quirks(ddata);
1011
1012 return 0;
1013 }
1014
sysc_init_sysc_mask(struct sysc * ddata)1015 static int sysc_init_sysc_mask(struct sysc *ddata)
1016 {
1017 struct device_node *np = ddata->dev->of_node;
1018 int error;
1019 u32 val;
1020
1021 error = of_property_read_u32(np, "ti,sysc-mask", &val);
1022 if (error)
1023 return 0;
1024
1025 if (val)
1026 ddata->cfg.sysc_val = val & ddata->cap->sysc_mask;
1027 else
1028 ddata->cfg.sysc_val = ddata->cap->sysc_mask;
1029
1030 return 0;
1031 }
1032
sysc_init_idlemode(struct sysc * ddata,u8 * idlemodes,const char * name)1033 static int sysc_init_idlemode(struct sysc *ddata, u8 *idlemodes,
1034 const char *name)
1035 {
1036 struct device_node *np = ddata->dev->of_node;
1037 struct property *prop;
1038 const __be32 *p;
1039 u32 val;
1040
1041 of_property_for_each_u32(np, name, prop, p, val) {
1042 if (val >= SYSC_NR_IDLEMODES) {
1043 dev_err(ddata->dev, "invalid idlemode: %i\n", val);
1044 return -EINVAL;
1045 }
1046 *idlemodes |= (1 << val);
1047 }
1048
1049 return 0;
1050 }
1051
sysc_init_idlemodes(struct sysc * ddata)1052 static int sysc_init_idlemodes(struct sysc *ddata)
1053 {
1054 int error;
1055
1056 error = sysc_init_idlemode(ddata, &ddata->cfg.midlemodes,
1057 "ti,sysc-midle");
1058 if (error)
1059 return error;
1060
1061 error = sysc_init_idlemode(ddata, &ddata->cfg.sidlemodes,
1062 "ti,sysc-sidle");
1063 if (error)
1064 return error;
1065
1066 return 0;
1067 }
1068
1069 /*
1070 * Only some devices on omap4 and later have SYSCONFIG reset done
1071 * bit. We can detect this if there is no SYSSTATUS at all, or the
1072 * SYSTATUS bit 0 is not used. Note that some SYSSTATUS registers
1073 * have multiple bits for the child devices like OHCI and EHCI.
1074 * Depends on SYSC being parsed first.
1075 */
sysc_init_syss_mask(struct sysc * ddata)1076 static int sysc_init_syss_mask(struct sysc *ddata)
1077 {
1078 struct device_node *np = ddata->dev->of_node;
1079 int error;
1080 u32 val;
1081
1082 error = of_property_read_u32(np, "ti,syss-mask", &val);
1083 if (error) {
1084 if ((ddata->cap->type == TI_SYSC_OMAP4 ||
1085 ddata->cap->type == TI_SYSC_OMAP4_TIMER) &&
1086 (ddata->cfg.sysc_val & SYSC_OMAP4_SOFTRESET))
1087 ddata->cfg.quirks |= SYSC_QUIRK_RESET_STATUS;
1088
1089 return 0;
1090 }
1091
1092 if (!(val & 1) && (ddata->cfg.sysc_val & SYSC_OMAP4_SOFTRESET))
1093 ddata->cfg.quirks |= SYSC_QUIRK_RESET_STATUS;
1094
1095 ddata->cfg.syss_mask = val;
1096
1097 return 0;
1098 }
1099
1100 /*
1101 * Many child device drivers need to have fck and opt clocks available
1102 * to get the clock rate for device internal configuration etc.
1103 */
sysc_child_add_named_clock(struct sysc * ddata,struct device * child,const char * name)1104 static int sysc_child_add_named_clock(struct sysc *ddata,
1105 struct device *child,
1106 const char *name)
1107 {
1108 struct clk *clk;
1109 struct clk_lookup *l;
1110 int error = 0;
1111
1112 if (!name)
1113 return 0;
1114
1115 clk = clk_get(child, name);
1116 if (!IS_ERR(clk)) {
1117 clk_put(clk);
1118
1119 return -EEXIST;
1120 }
1121
1122 clk = clk_get(ddata->dev, name);
1123 if (IS_ERR(clk))
1124 return -ENODEV;
1125
1126 l = clkdev_create(clk, name, dev_name(child));
1127 if (!l)
1128 error = -ENOMEM;
1129
1130 clk_put(clk);
1131
1132 return error;
1133 }
1134
sysc_child_add_clocks(struct sysc * ddata,struct device * child)1135 static int sysc_child_add_clocks(struct sysc *ddata,
1136 struct device *child)
1137 {
1138 int i, error;
1139
1140 for (i = 0; i < ddata->nr_clocks; i++) {
1141 error = sysc_child_add_named_clock(ddata,
1142 child,
1143 ddata->clock_roles[i]);
1144 if (error && error != -EEXIST) {
1145 dev_err(ddata->dev, "could not add child clock %s: %i\n",
1146 ddata->clock_roles[i], error);
1147
1148 return error;
1149 }
1150 }
1151
1152 return 0;
1153 }
1154
1155 static struct device_type sysc_device_type = {
1156 };
1157
sysc_child_to_parent(struct device * dev)1158 static struct sysc *sysc_child_to_parent(struct device *dev)
1159 {
1160 struct device *parent = dev->parent;
1161
1162 if (!parent || parent->type != &sysc_device_type)
1163 return NULL;
1164
1165 return dev_get_drvdata(parent);
1166 }
1167
sysc_child_runtime_suspend(struct device * dev)1168 static int __maybe_unused sysc_child_runtime_suspend(struct device *dev)
1169 {
1170 struct sysc *ddata;
1171 int error;
1172
1173 ddata = sysc_child_to_parent(dev);
1174
1175 error = pm_generic_runtime_suspend(dev);
1176 if (error)
1177 return error;
1178
1179 if (!ddata->enabled)
1180 return 0;
1181
1182 return sysc_runtime_suspend(ddata->dev);
1183 }
1184
sysc_child_runtime_resume(struct device * dev)1185 static int __maybe_unused sysc_child_runtime_resume(struct device *dev)
1186 {
1187 struct sysc *ddata;
1188 int error;
1189
1190 ddata = sysc_child_to_parent(dev);
1191
1192 if (!ddata->enabled) {
1193 error = sysc_runtime_resume(ddata->dev);
1194 if (error < 0)
1195 dev_err(ddata->dev,
1196 "%s error: %i\n", __func__, error);
1197 }
1198
1199 return pm_generic_runtime_resume(dev);
1200 }
1201
1202 #ifdef CONFIG_PM_SLEEP
sysc_child_suspend_noirq(struct device * dev)1203 static int sysc_child_suspend_noirq(struct device *dev)
1204 {
1205 struct sysc *ddata;
1206 int error;
1207
1208 ddata = sysc_child_to_parent(dev);
1209
1210 dev_dbg(ddata->dev, "%s %s\n", __func__,
1211 ddata->name ? ddata->name : "");
1212
1213 error = pm_generic_suspend_noirq(dev);
1214 if (error) {
1215 dev_err(dev, "%s error at %i: %i\n",
1216 __func__, __LINE__, error);
1217
1218 return error;
1219 }
1220
1221 if (!pm_runtime_status_suspended(dev)) {
1222 error = pm_generic_runtime_suspend(dev);
1223 if (error) {
1224 dev_warn(dev, "%s busy at %i: %i\n",
1225 __func__, __LINE__, error);
1226
1227 return 0;
1228 }
1229
1230 error = sysc_runtime_suspend(ddata->dev);
1231 if (error) {
1232 dev_err(dev, "%s error at %i: %i\n",
1233 __func__, __LINE__, error);
1234
1235 return error;
1236 }
1237
1238 ddata->child_needs_resume = true;
1239 }
1240
1241 return 0;
1242 }
1243
sysc_child_resume_noirq(struct device * dev)1244 static int sysc_child_resume_noirq(struct device *dev)
1245 {
1246 struct sysc *ddata;
1247 int error;
1248
1249 ddata = sysc_child_to_parent(dev);
1250
1251 dev_dbg(ddata->dev, "%s %s\n", __func__,
1252 ddata->name ? ddata->name : "");
1253
1254 if (ddata->child_needs_resume) {
1255 ddata->child_needs_resume = false;
1256
1257 error = sysc_runtime_resume(ddata->dev);
1258 if (error)
1259 dev_err(ddata->dev,
1260 "%s runtime resume error: %i\n",
1261 __func__, error);
1262
1263 error = pm_generic_runtime_resume(dev);
1264 if (error)
1265 dev_err(ddata->dev,
1266 "%s generic runtime resume: %i\n",
1267 __func__, error);
1268 }
1269
1270 return pm_generic_resume_noirq(dev);
1271 }
1272 #endif
1273
1274 struct dev_pm_domain sysc_child_pm_domain = {
1275 .ops = {
1276 SET_RUNTIME_PM_OPS(sysc_child_runtime_suspend,
1277 sysc_child_runtime_resume,
1278 NULL)
1279 USE_PLATFORM_PM_SLEEP_OPS
1280 SET_NOIRQ_SYSTEM_SLEEP_PM_OPS(sysc_child_suspend_noirq,
1281 sysc_child_resume_noirq)
1282 }
1283 };
1284
1285 /**
1286 * sysc_legacy_idle_quirk - handle children in omap_device compatible way
1287 * @ddata: device driver data
1288 * @child: child device driver
1289 *
1290 * Allow idle for child devices as done with _od_runtime_suspend().
1291 * Otherwise many child devices will not idle because of the permanent
1292 * parent usecount set in pm_runtime_irq_safe().
1293 *
1294 * Note that the long term solution is to just modify the child device
1295 * drivers to not set pm_runtime_irq_safe() and then this can be just
1296 * dropped.
1297 */
sysc_legacy_idle_quirk(struct sysc * ddata,struct device * child)1298 static void sysc_legacy_idle_quirk(struct sysc *ddata, struct device *child)
1299 {
1300 if (!ddata->legacy_mode)
1301 return;
1302
1303 if (ddata->cfg.quirks & SYSC_QUIRK_LEGACY_IDLE)
1304 dev_pm_domain_set(child, &sysc_child_pm_domain);
1305 }
1306
sysc_notifier_call(struct notifier_block * nb,unsigned long event,void * device)1307 static int sysc_notifier_call(struct notifier_block *nb,
1308 unsigned long event, void *device)
1309 {
1310 struct device *dev = device;
1311 struct sysc *ddata;
1312 int error;
1313
1314 ddata = sysc_child_to_parent(dev);
1315 if (!ddata)
1316 return NOTIFY_DONE;
1317
1318 switch (event) {
1319 case BUS_NOTIFY_ADD_DEVICE:
1320 error = sysc_child_add_clocks(ddata, dev);
1321 if (error)
1322 return error;
1323 sysc_legacy_idle_quirk(ddata, dev);
1324 break;
1325 default:
1326 break;
1327 }
1328
1329 return NOTIFY_DONE;
1330 }
1331
1332 static struct notifier_block sysc_nb = {
1333 .notifier_call = sysc_notifier_call,
1334 };
1335
1336 /* Device tree configured quirks */
1337 struct sysc_dts_quirk {
1338 const char *name;
1339 u32 mask;
1340 };
1341
1342 static const struct sysc_dts_quirk sysc_dts_quirks[] = {
1343 { .name = "ti,no-idle-on-init",
1344 .mask = SYSC_QUIRK_NO_IDLE_ON_INIT, },
1345 { .name = "ti,no-reset-on-init",
1346 .mask = SYSC_QUIRK_NO_RESET_ON_INIT, },
1347 };
1348
sysc_init_dts_quirks(struct sysc * ddata)1349 static int sysc_init_dts_quirks(struct sysc *ddata)
1350 {
1351 struct device_node *np = ddata->dev->of_node;
1352 const struct property *prop;
1353 int i, len, error;
1354 u32 val;
1355
1356 ddata->legacy_mode = of_get_property(np, "ti,hwmods", NULL);
1357
1358 for (i = 0; i < ARRAY_SIZE(sysc_dts_quirks); i++) {
1359 prop = of_get_property(np, sysc_dts_quirks[i].name, &len);
1360 if (!prop)
1361 continue;
1362
1363 ddata->cfg.quirks |= sysc_dts_quirks[i].mask;
1364 }
1365
1366 error = of_property_read_u32(np, "ti,sysc-delay-us", &val);
1367 if (!error) {
1368 if (val > 255) {
1369 dev_warn(ddata->dev, "bad ti,sysc-delay-us: %i\n",
1370 val);
1371 }
1372
1373 ddata->cfg.srst_udelay = (u8)val;
1374 }
1375
1376 return 0;
1377 }
1378
sysc_unprepare(struct sysc * ddata)1379 static void sysc_unprepare(struct sysc *ddata)
1380 {
1381 int i;
1382
1383 for (i = 0; i < SYSC_MAX_CLOCKS; i++) {
1384 if (!IS_ERR_OR_NULL(ddata->clocks[i]))
1385 clk_unprepare(ddata->clocks[i]);
1386 }
1387 }
1388
1389 /*
1390 * Common sysc register bits found on omap2, also known as type1
1391 */
1392 static const struct sysc_regbits sysc_regbits_omap2 = {
1393 .dmadisable_shift = -ENODEV,
1394 .midle_shift = 12,
1395 .sidle_shift = 3,
1396 .clkact_shift = 8,
1397 .emufree_shift = 5,
1398 .enwkup_shift = 2,
1399 .srst_shift = 1,
1400 .autoidle_shift = 0,
1401 };
1402
1403 static const struct sysc_capabilities sysc_omap2 = {
1404 .type = TI_SYSC_OMAP2,
1405 .sysc_mask = SYSC_OMAP2_CLOCKACTIVITY | SYSC_OMAP2_EMUFREE |
1406 SYSC_OMAP2_ENAWAKEUP | SYSC_OMAP2_SOFTRESET |
1407 SYSC_OMAP2_AUTOIDLE,
1408 .regbits = &sysc_regbits_omap2,
1409 };
1410
1411 /* All omap2 and 3 timers, and timers 1, 2 & 10 on omap 4 and 5 */
1412 static const struct sysc_capabilities sysc_omap2_timer = {
1413 .type = TI_SYSC_OMAP2_TIMER,
1414 .sysc_mask = SYSC_OMAP2_CLOCKACTIVITY | SYSC_OMAP2_EMUFREE |
1415 SYSC_OMAP2_ENAWAKEUP | SYSC_OMAP2_SOFTRESET |
1416 SYSC_OMAP2_AUTOIDLE,
1417 .regbits = &sysc_regbits_omap2,
1418 .mod_quirks = SYSC_QUIRK_USE_CLOCKACT,
1419 };
1420
1421 /*
1422 * SHAM2 (SHA1/MD5) sysc found on omap3, a variant of sysc_regbits_omap2
1423 * with different sidle position
1424 */
1425 static const struct sysc_regbits sysc_regbits_omap3_sham = {
1426 .dmadisable_shift = -ENODEV,
1427 .midle_shift = -ENODEV,
1428 .sidle_shift = 4,
1429 .clkact_shift = -ENODEV,
1430 .enwkup_shift = -ENODEV,
1431 .srst_shift = 1,
1432 .autoidle_shift = 0,
1433 .emufree_shift = -ENODEV,
1434 };
1435
1436 static const struct sysc_capabilities sysc_omap3_sham = {
1437 .type = TI_SYSC_OMAP3_SHAM,
1438 .sysc_mask = SYSC_OMAP2_SOFTRESET | SYSC_OMAP2_AUTOIDLE,
1439 .regbits = &sysc_regbits_omap3_sham,
1440 };
1441
1442 /*
1443 * AES register bits found on omap3 and later, a variant of
1444 * sysc_regbits_omap2 with different sidle position
1445 */
1446 static const struct sysc_regbits sysc_regbits_omap3_aes = {
1447 .dmadisable_shift = -ENODEV,
1448 .midle_shift = -ENODEV,
1449 .sidle_shift = 6,
1450 .clkact_shift = -ENODEV,
1451 .enwkup_shift = -ENODEV,
1452 .srst_shift = 1,
1453 .autoidle_shift = 0,
1454 .emufree_shift = -ENODEV,
1455 };
1456
1457 static const struct sysc_capabilities sysc_omap3_aes = {
1458 .type = TI_SYSC_OMAP3_AES,
1459 .sysc_mask = SYSC_OMAP2_SOFTRESET | SYSC_OMAP2_AUTOIDLE,
1460 .regbits = &sysc_regbits_omap3_aes,
1461 };
1462
1463 /*
1464 * Common sysc register bits found on omap4, also known as type2
1465 */
1466 static const struct sysc_regbits sysc_regbits_omap4 = {
1467 .dmadisable_shift = 16,
1468 .midle_shift = 4,
1469 .sidle_shift = 2,
1470 .clkact_shift = -ENODEV,
1471 .enwkup_shift = -ENODEV,
1472 .emufree_shift = 1,
1473 .srst_shift = 0,
1474 .autoidle_shift = -ENODEV,
1475 };
1476
1477 static const struct sysc_capabilities sysc_omap4 = {
1478 .type = TI_SYSC_OMAP4,
1479 .sysc_mask = SYSC_OMAP4_DMADISABLE | SYSC_OMAP4_FREEEMU |
1480 SYSC_OMAP4_SOFTRESET,
1481 .regbits = &sysc_regbits_omap4,
1482 };
1483
1484 static const struct sysc_capabilities sysc_omap4_timer = {
1485 .type = TI_SYSC_OMAP4_TIMER,
1486 .sysc_mask = SYSC_OMAP4_DMADISABLE | SYSC_OMAP4_FREEEMU |
1487 SYSC_OMAP4_SOFTRESET,
1488 .regbits = &sysc_regbits_omap4,
1489 };
1490
1491 /*
1492 * Common sysc register bits found on omap4, also known as type3
1493 */
1494 static const struct sysc_regbits sysc_regbits_omap4_simple = {
1495 .dmadisable_shift = -ENODEV,
1496 .midle_shift = 2,
1497 .sidle_shift = 0,
1498 .clkact_shift = -ENODEV,
1499 .enwkup_shift = -ENODEV,
1500 .srst_shift = -ENODEV,
1501 .emufree_shift = -ENODEV,
1502 .autoidle_shift = -ENODEV,
1503 };
1504
1505 static const struct sysc_capabilities sysc_omap4_simple = {
1506 .type = TI_SYSC_OMAP4_SIMPLE,
1507 .regbits = &sysc_regbits_omap4_simple,
1508 };
1509
1510 /*
1511 * SmartReflex sysc found on omap34xx
1512 */
1513 static const struct sysc_regbits sysc_regbits_omap34xx_sr = {
1514 .dmadisable_shift = -ENODEV,
1515 .midle_shift = -ENODEV,
1516 .sidle_shift = -ENODEV,
1517 .clkact_shift = 20,
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_34xx_sr = {
1525 .type = TI_SYSC_OMAP34XX_SR,
1526 .sysc_mask = SYSC_OMAP2_CLOCKACTIVITY,
1527 .regbits = &sysc_regbits_omap34xx_sr,
1528 .mod_quirks = SYSC_QUIRK_USE_CLOCKACT | SYSC_QUIRK_UNCACHED |
1529 SYSC_QUIRK_LEGACY_IDLE,
1530 };
1531
1532 /*
1533 * SmartReflex sysc found on omap36xx and later
1534 */
1535 static const struct sysc_regbits sysc_regbits_omap36xx_sr = {
1536 .dmadisable_shift = -ENODEV,
1537 .midle_shift = -ENODEV,
1538 .sidle_shift = 24,
1539 .clkact_shift = -ENODEV,
1540 .enwkup_shift = 26,
1541 .srst_shift = -ENODEV,
1542 .emufree_shift = -ENODEV,
1543 .autoidle_shift = -ENODEV,
1544 };
1545
1546 static const struct sysc_capabilities sysc_36xx_sr = {
1547 .type = TI_SYSC_OMAP36XX_SR,
1548 .sysc_mask = SYSC_OMAP3_SR_ENAWAKEUP,
1549 .regbits = &sysc_regbits_omap36xx_sr,
1550 .mod_quirks = SYSC_QUIRK_UNCACHED | SYSC_QUIRK_LEGACY_IDLE,
1551 };
1552
1553 static const struct sysc_capabilities sysc_omap4_sr = {
1554 .type = TI_SYSC_OMAP4_SR,
1555 .regbits = &sysc_regbits_omap36xx_sr,
1556 .mod_quirks = SYSC_QUIRK_LEGACY_IDLE,
1557 };
1558
1559 /*
1560 * McASP register bits found on omap4 and later
1561 */
1562 static const struct sysc_regbits sysc_regbits_omap4_mcasp = {
1563 .dmadisable_shift = -ENODEV,
1564 .midle_shift = -ENODEV,
1565 .sidle_shift = 0,
1566 .clkact_shift = -ENODEV,
1567 .enwkup_shift = -ENODEV,
1568 .srst_shift = -ENODEV,
1569 .emufree_shift = -ENODEV,
1570 .autoidle_shift = -ENODEV,
1571 };
1572
1573 static const struct sysc_capabilities sysc_omap4_mcasp = {
1574 .type = TI_SYSC_OMAP4_MCASP,
1575 .regbits = &sysc_regbits_omap4_mcasp,
1576 };
1577
1578 /*
1579 * FS USB host found on omap4 and later
1580 */
1581 static const struct sysc_regbits sysc_regbits_omap4_usb_host_fs = {
1582 .dmadisable_shift = -ENODEV,
1583 .midle_shift = -ENODEV,
1584 .sidle_shift = 24,
1585 .clkact_shift = -ENODEV,
1586 .enwkup_shift = 26,
1587 .srst_shift = -ENODEV,
1588 .emufree_shift = -ENODEV,
1589 .autoidle_shift = -ENODEV,
1590 };
1591
1592 static const struct sysc_capabilities sysc_omap4_usb_host_fs = {
1593 .type = TI_SYSC_OMAP4_USB_HOST_FS,
1594 .sysc_mask = SYSC_OMAP2_ENAWAKEUP,
1595 .regbits = &sysc_regbits_omap4_usb_host_fs,
1596 };
1597
1598 static const struct sysc_regbits sysc_regbits_dra7_mcan = {
1599 .dmadisable_shift = -ENODEV,
1600 .midle_shift = -ENODEV,
1601 .sidle_shift = -ENODEV,
1602 .clkact_shift = -ENODEV,
1603 .enwkup_shift = 4,
1604 .srst_shift = 0,
1605 .emufree_shift = -ENODEV,
1606 .autoidle_shift = -ENODEV,
1607 };
1608
1609 static const struct sysc_capabilities sysc_dra7_mcan = {
1610 .type = TI_SYSC_DRA7_MCAN,
1611 .sysc_mask = SYSC_DRA7_MCAN_ENAWAKEUP | SYSC_OMAP4_SOFTRESET,
1612 .regbits = &sysc_regbits_dra7_mcan,
1613 };
1614
sysc_init_pdata(struct sysc * ddata)1615 static int sysc_init_pdata(struct sysc *ddata)
1616 {
1617 struct ti_sysc_platform_data *pdata = dev_get_platdata(ddata->dev);
1618 struct ti_sysc_module_data mdata;
1619 int error = 0;
1620
1621 if (!pdata || !ddata->legacy_mode)
1622 return 0;
1623
1624 mdata.name = ddata->legacy_mode;
1625 mdata.module_pa = ddata->module_pa;
1626 mdata.module_size = ddata->module_size;
1627 mdata.offsets = ddata->offsets;
1628 mdata.nr_offsets = SYSC_MAX_REGS;
1629 mdata.cap = ddata->cap;
1630 mdata.cfg = &ddata->cfg;
1631
1632 if (!pdata->init_module)
1633 return -ENODEV;
1634
1635 error = pdata->init_module(ddata->dev, &mdata, &ddata->cookie);
1636 if (error == -EEXIST)
1637 error = 0;
1638
1639 return error;
1640 }
1641
sysc_init_match(struct sysc * ddata)1642 static int sysc_init_match(struct sysc *ddata)
1643 {
1644 const struct sysc_capabilities *cap;
1645
1646 cap = of_device_get_match_data(ddata->dev);
1647 if (!cap)
1648 return -EINVAL;
1649
1650 ddata->cap = cap;
1651 if (ddata->cap)
1652 ddata->cfg.quirks |= ddata->cap->mod_quirks;
1653
1654 return 0;
1655 }
1656
ti_sysc_idle(struct work_struct * work)1657 static void ti_sysc_idle(struct work_struct *work)
1658 {
1659 struct sysc *ddata;
1660
1661 ddata = container_of(work, struct sysc, idle_work.work);
1662
1663 if (pm_runtime_active(ddata->dev))
1664 pm_runtime_put_sync(ddata->dev);
1665 }
1666
1667 static const struct of_device_id sysc_match_table[] = {
1668 { .compatible = "simple-bus", },
1669 { /* sentinel */ },
1670 };
1671
sysc_probe(struct platform_device * pdev)1672 static int sysc_probe(struct platform_device *pdev)
1673 {
1674 struct ti_sysc_platform_data *pdata = dev_get_platdata(&pdev->dev);
1675 struct sysc *ddata;
1676 int error;
1677
1678 ddata = devm_kzalloc(&pdev->dev, sizeof(*ddata), GFP_KERNEL);
1679 if (!ddata)
1680 return -ENOMEM;
1681
1682 ddata->dev = &pdev->dev;
1683 platform_set_drvdata(pdev, ddata);
1684
1685 error = sysc_init_match(ddata);
1686 if (error)
1687 return error;
1688
1689 error = sysc_init_dts_quirks(ddata);
1690 if (error)
1691 goto unprepare;
1692
1693 error = sysc_get_clocks(ddata);
1694 if (error)
1695 return error;
1696
1697 error = sysc_map_and_check_registers(ddata);
1698 if (error)
1699 goto unprepare;
1700
1701 error = sysc_init_sysc_mask(ddata);
1702 if (error)
1703 goto unprepare;
1704
1705 error = sysc_init_idlemodes(ddata);
1706 if (error)
1707 goto unprepare;
1708
1709 error = sysc_init_syss_mask(ddata);
1710 if (error)
1711 goto unprepare;
1712
1713 error = sysc_init_pdata(ddata);
1714 if (error)
1715 goto unprepare;
1716
1717 error = sysc_init_resets(ddata);
1718 if (error)
1719 return error;
1720
1721 pm_runtime_enable(ddata->dev);
1722 error = sysc_init_module(ddata);
1723 if (error)
1724 goto unprepare;
1725
1726 error = pm_runtime_get_sync(ddata->dev);
1727 if (error < 0) {
1728 pm_runtime_put_noidle(ddata->dev);
1729 pm_runtime_disable(ddata->dev);
1730 goto unprepare;
1731 }
1732
1733 sysc_show_registers(ddata);
1734
1735 ddata->dev->type = &sysc_device_type;
1736 error = of_platform_populate(ddata->dev->of_node, sysc_match_table,
1737 pdata ? pdata->auxdata : NULL,
1738 ddata->dev);
1739 if (error)
1740 goto err;
1741
1742 INIT_DELAYED_WORK(&ddata->idle_work, ti_sysc_idle);
1743
1744 /* At least earlycon won't survive without deferred idle */
1745 if (ddata->cfg.quirks & (SYSC_QUIRK_NO_IDLE_ON_INIT |
1746 SYSC_QUIRK_NO_RESET_ON_INIT)) {
1747 schedule_delayed_work(&ddata->idle_work, 3000);
1748 } else {
1749 pm_runtime_put(&pdev->dev);
1750 }
1751
1752 if (!of_get_available_child_count(ddata->dev->of_node))
1753 reset_control_assert(ddata->rsts);
1754
1755 return 0;
1756
1757 err:
1758 pm_runtime_put_sync(&pdev->dev);
1759 pm_runtime_disable(&pdev->dev);
1760 unprepare:
1761 sysc_unprepare(ddata);
1762
1763 return error;
1764 }
1765
sysc_remove(struct platform_device * pdev)1766 static int sysc_remove(struct platform_device *pdev)
1767 {
1768 struct sysc *ddata = platform_get_drvdata(pdev);
1769 int error;
1770
1771 cancel_delayed_work_sync(&ddata->idle_work);
1772
1773 error = pm_runtime_get_sync(ddata->dev);
1774 if (error < 0) {
1775 pm_runtime_put_noidle(ddata->dev);
1776 pm_runtime_disable(ddata->dev);
1777 goto unprepare;
1778 }
1779
1780 of_platform_depopulate(&pdev->dev);
1781
1782 pm_runtime_put_sync(&pdev->dev);
1783 pm_runtime_disable(&pdev->dev);
1784 reset_control_assert(ddata->rsts);
1785
1786 unprepare:
1787 sysc_unprepare(ddata);
1788
1789 return 0;
1790 }
1791
1792 static const struct of_device_id sysc_match[] = {
1793 { .compatible = "ti,sysc-omap2", .data = &sysc_omap2, },
1794 { .compatible = "ti,sysc-omap2-timer", .data = &sysc_omap2_timer, },
1795 { .compatible = "ti,sysc-omap4", .data = &sysc_omap4, },
1796 { .compatible = "ti,sysc-omap4-timer", .data = &sysc_omap4_timer, },
1797 { .compatible = "ti,sysc-omap4-simple", .data = &sysc_omap4_simple, },
1798 { .compatible = "ti,sysc-omap3430-sr", .data = &sysc_34xx_sr, },
1799 { .compatible = "ti,sysc-omap3630-sr", .data = &sysc_36xx_sr, },
1800 { .compatible = "ti,sysc-omap4-sr", .data = &sysc_omap4_sr, },
1801 { .compatible = "ti,sysc-omap3-sham", .data = &sysc_omap3_sham, },
1802 { .compatible = "ti,sysc-omap-aes", .data = &sysc_omap3_aes, },
1803 { .compatible = "ti,sysc-mcasp", .data = &sysc_omap4_mcasp, },
1804 { .compatible = "ti,sysc-usb-host-fs",
1805 .data = &sysc_omap4_usb_host_fs, },
1806 { .compatible = "ti,sysc-dra7-mcan", .data = &sysc_dra7_mcan, },
1807 { },
1808 };
1809 MODULE_DEVICE_TABLE(of, sysc_match);
1810
1811 static struct platform_driver sysc_driver = {
1812 .probe = sysc_probe,
1813 .remove = sysc_remove,
1814 .driver = {
1815 .name = "ti-sysc",
1816 .of_match_table = sysc_match,
1817 .pm = &sysc_pm_ops,
1818 },
1819 };
1820
sysc_init(void)1821 static int __init sysc_init(void)
1822 {
1823 bus_register_notifier(&platform_bus_type, &sysc_nb);
1824
1825 return platform_driver_register(&sysc_driver);
1826 }
1827 module_init(sysc_init);
1828
sysc_exit(void)1829 static void __exit sysc_exit(void)
1830 {
1831 bus_unregister_notifier(&platform_bus_type, &sysc_nb);
1832 platform_driver_unregister(&sysc_driver);
1833 }
1834 module_exit(sysc_exit);
1835
1836 MODULE_DESCRIPTION("TI sysc interconnect target driver");
1837 MODULE_LICENSE("GPL v2");
1838
