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9#include <linux/kernel.h>
10#include <linux/clk.h>
11#include <linux/device.h>
12#include <linux/io.h>
13#include <linux/iopoll.h>
14#include <linux/module.h>
15#include <linux/of.h>
16#include <linux/of_device.h>
17#include <linux/platform_device.h>
18#include <linux/pm_clock.h>
19#include <linux/pm_domain.h>
20#include <linux/reset-controller.h>
21#include <linux/delay.h>
22
23#include <linux/platform_data/ti-prm.h>
24
25enum omap_prm_domain_mode {
26 OMAP_PRMD_OFF,
27 OMAP_PRMD_RETENTION,
28 OMAP_PRMD_ON_INACTIVE,
29 OMAP_PRMD_ON_ACTIVE,
30};
31
32struct omap_prm_domain_map {
33 unsigned int usable_modes;
34 unsigned long statechange:1;
35 unsigned long logicretstate:1;
36};
37
38struct omap_prm_domain {
39 struct device *dev;
40 struct omap_prm *prm;
41 struct generic_pm_domain pd;
42 u16 pwrstctrl;
43 u16 pwrstst;
44 const struct omap_prm_domain_map *cap;
45 u32 pwrstctrl_saved;
46 unsigned int uses_pm_clk:1;
47};
48
49struct omap_rst_map {
50 s8 rst;
51 s8 st;
52};
53
54struct omap_prm_data {
55 u32 base;
56 const char *name;
57 const char *clkdm_name;
58 u16 pwrstctrl;
59 u16 pwrstst;
60 const struct omap_prm_domain_map *dmap;
61 u16 rstctrl;
62 u16 rstst;
63 const struct omap_rst_map *rstmap;
64 u8 flags;
65};
66
67struct omap_prm {
68 const struct omap_prm_data *data;
69 void __iomem *base;
70 struct omap_prm_domain *prmd;
71};
72
73struct omap_reset_data {
74 struct reset_controller_dev rcdev;
75 struct omap_prm *prm;
76 u32 mask;
77 spinlock_t lock;
78 struct clockdomain *clkdm;
79 struct device *dev;
80};
81
82#define genpd_to_prm_domain(gpd) container_of(gpd, struct omap_prm_domain, pd)
83#define to_omap_reset_data(p) container_of((p), struct omap_reset_data, rcdev)
84
85#define OMAP_MAX_RESETS 8
86#define OMAP_RESET_MAX_WAIT 10000
87
88#define OMAP_PRM_HAS_RSTCTRL BIT(0)
89#define OMAP_PRM_HAS_RSTST BIT(1)
90#define OMAP_PRM_HAS_NO_CLKDM BIT(2)
91
92#define OMAP_PRM_HAS_RESETS (OMAP_PRM_HAS_RSTCTRL | OMAP_PRM_HAS_RSTST)
93
94#define PRM_STATE_MAX_WAIT 10000
95#define PRM_LOGICRETSTATE BIT(2)
96#define PRM_LOWPOWERSTATECHANGE BIT(4)
97#define PRM_POWERSTATE_MASK OMAP_PRMD_ON_ACTIVE
98
99#define PRM_ST_INTRANSITION BIT(20)
100
101static const struct omap_prm_domain_map omap_prm_all = {
102 .usable_modes = BIT(OMAP_PRMD_ON_ACTIVE) | BIT(OMAP_PRMD_ON_INACTIVE) |
103 BIT(OMAP_PRMD_RETENTION) | BIT(OMAP_PRMD_OFF),
104 .statechange = 1,
105 .logicretstate = 1,
106};
107
108static const struct omap_prm_domain_map omap_prm_noinact = {
109 .usable_modes = BIT(OMAP_PRMD_ON_ACTIVE) | BIT(OMAP_PRMD_RETENTION) |
110 BIT(OMAP_PRMD_OFF),
111 .statechange = 1,
112 .logicretstate = 1,
113};
114
115static const struct omap_prm_domain_map omap_prm_nooff = {
116 .usable_modes = BIT(OMAP_PRMD_ON_ACTIVE) | BIT(OMAP_PRMD_ON_INACTIVE) |
117 BIT(OMAP_PRMD_RETENTION),
118 .statechange = 1,
119 .logicretstate = 1,
120};
121
122static const struct omap_prm_domain_map omap_prm_onoff_noauto = {
123 .usable_modes = BIT(OMAP_PRMD_ON_ACTIVE) | BIT(OMAP_PRMD_OFF),
124 .statechange = 1,
125};
126
127static const struct omap_prm_domain_map omap_prm_alwon = {
128 .usable_modes = BIT(OMAP_PRMD_ON_ACTIVE),
129};
130
131static const struct omap_prm_domain_map omap_prm_reton = {
132 .usable_modes = BIT(OMAP_PRMD_ON_ACTIVE) | BIT(OMAP_PRMD_RETENTION),
133 .statechange = 1,
134 .logicretstate = 1,
135};
136
137static const struct omap_rst_map rst_map_0[] = {
138 { .rst = 0, .st = 0 },
139 { .rst = -1 },
140};
141
142static const struct omap_rst_map rst_map_01[] = {
143 { .rst = 0, .st = 0 },
144 { .rst = 1, .st = 1 },
145 { .rst = -1 },
146};
147
148static const struct omap_rst_map rst_map_012[] = {
149 { .rst = 0, .st = 0 },
150 { .rst = 1, .st = 1 },
151 { .rst = 2, .st = 2 },
152 { .rst = -1 },
153};
154
155static const struct omap_prm_data omap4_prm_data[] = {
156 {
157 .name = "mpu", .base = 0x4a306300,
158 .pwrstctrl = 0x0, .pwrstst = 0x4, .dmap = &omap_prm_reton,
159 },
160 {
161 .name = "tesla", .base = 0x4a306400,
162 .pwrstctrl = 0x0, .pwrstst = 0x4, .dmap = &omap_prm_noinact,
163 .rstctrl = 0x10, .rstst = 0x14, .rstmap = rst_map_01
164 },
165 {
166 .name = "abe", .base = 0x4a306500,
167 .pwrstctrl = 0, .pwrstst = 0x4, .dmap = &omap_prm_all,
168 },
169 {
170 .name = "always_on_core", .base = 0x4a306600,
171 .pwrstctrl = 0x0, .pwrstst = 0x4, .dmap = &omap_prm_alwon,
172 },
173 {
174 .name = "core", .base = 0x4a306700,
175 .pwrstctrl = 0x0, .pwrstst = 0x4, .dmap = &omap_prm_reton,
176 .rstctrl = 0x210, .rstst = 0x214, .clkdm_name = "ducati",
177 .rstmap = rst_map_012
178 },
179 {
180 .name = "ivahd", .base = 0x4a306f00,
181 .pwrstctrl = 0x0, .pwrstst = 0x4, .dmap = &omap_prm_noinact,
182 .rstctrl = 0x10, .rstst = 0x14, .rstmap = rst_map_012
183 },
184 {
185 .name = "cam", .base = 0x4a307000,
186 .pwrstctrl = 0x0, .pwrstst = 0x4, .dmap = &omap_prm_onoff_noauto,
187 },
188 {
189 .name = "dss", .base = 0x4a307100,
190 .pwrstctrl = 0x0, .pwrstst = 0x4, .dmap = &omap_prm_noinact
191 },
192 {
193 .name = "gfx", .base = 0x4a307200,
194 .pwrstctrl = 0x0, .pwrstst = 0x4, .dmap = &omap_prm_onoff_noauto
195 },
196 {
197 .name = "l3init", .base = 0x4a307300,
198 .pwrstctrl = 0x0, .pwrstst = 0x4, .dmap = &omap_prm_reton
199 },
200 {
201 .name = "l4per", .base = 0x4a307400,
202 .pwrstctrl = 0x0, .pwrstst = 0x4, .dmap = &omap_prm_reton
203 },
204 {
205 .name = "cefuse", .base = 0x4a307600,
206 .pwrstctrl = 0x0, .pwrstst = 0x4, .dmap = &omap_prm_onoff_noauto
207 },
208 {
209 .name = "wkup", .base = 0x4a307700,
210 .pwrstctrl = 0x0, .pwrstst = 0x4, .dmap = &omap_prm_alwon
211 },
212 {
213 .name = "emu", .base = 0x4a307900,
214 .pwrstctrl = 0x0, .pwrstst = 0x4, .dmap = &omap_prm_onoff_noauto
215 },
216 {
217 .name = "device", .base = 0x4a307b00,
218 .rstctrl = 0x0, .rstst = 0x4, .rstmap = rst_map_01,
219 .flags = OMAP_PRM_HAS_RSTCTRL | OMAP_PRM_HAS_NO_CLKDM
220 },
221 { },
222};
223
224static const struct omap_prm_data omap5_prm_data[] = {
225 {
226 .name = "mpu", .base = 0x4ae06300,
227 .pwrstctrl = 0x0, .pwrstst = 0x4, .dmap = &omap_prm_reton,
228 },
229 {
230 .name = "dsp", .base = 0x4ae06400,
231 .pwrstctrl = 0x0, .pwrstst = 0x4, .dmap = &omap_prm_noinact,
232 .rstctrl = 0x10, .rstst = 0x14, .rstmap = rst_map_01
233 },
234 {
235 .name = "abe", .base = 0x4ae06500,
236 .pwrstctrl = 0, .pwrstst = 0x4, .dmap = &omap_prm_nooff,
237 },
238 {
239 .name = "coreaon", .base = 0x4ae06600,
240 .pwrstctrl = 0x0, .pwrstst = 0x4, .dmap = &omap_prm_alwon
241 },
242 {
243 .name = "core", .base = 0x4ae06700,
244 .pwrstctrl = 0x0, .pwrstst = 0x4, .dmap = &omap_prm_reton,
245 .rstctrl = 0x210, .rstst = 0x214, .clkdm_name = "ipu",
246 .rstmap = rst_map_012
247 },
248 {
249 .name = "iva", .base = 0x4ae07200,
250 .pwrstctrl = 0x0, .pwrstst = 0x4, .dmap = &omap_prm_noinact,
251 .rstctrl = 0x10, .rstst = 0x14, .rstmap = rst_map_012
252 },
253 {
254 .name = "cam", .base = 0x4ae07300,
255 .pwrstctrl = 0x0, .pwrstst = 0x4, .dmap = &omap_prm_onoff_noauto
256 },
257 {
258 .name = "dss", .base = 0x4ae07400,
259 .pwrstctrl = 0x0, .pwrstst = 0x4, .dmap = &omap_prm_noinact
260 },
261 {
262 .name = "gpu", .base = 0x4ae07500,
263 .pwrstctrl = 0x0, .pwrstst = 0x4, .dmap = &omap_prm_onoff_noauto
264 },
265 {
266 .name = "l3init", .base = 0x4ae07600,
267 .pwrstctrl = 0x0, .pwrstst = 0x4, .dmap = &omap_prm_reton
268 },
269 {
270 .name = "custefuse", .base = 0x4ae07700,
271 .pwrstctrl = 0x0, .pwrstst = 0x4, .dmap = &omap_prm_onoff_noauto
272 },
273 {
274 .name = "wkupaon", .base = 0x4ae07800,
275 .pwrstctrl = 0x0, .pwrstst = 0x4, .dmap = &omap_prm_alwon
276 },
277 {
278 .name = "emu", .base = 0x4ae07a00,
279 .pwrstctrl = 0x0, .pwrstst = 0x4, .dmap = &omap_prm_onoff_noauto
280 },
281 {
282 .name = "device", .base = 0x4ae07c00,
283 .rstctrl = 0x0, .rstst = 0x4, .rstmap = rst_map_01,
284 .flags = OMAP_PRM_HAS_RSTCTRL | OMAP_PRM_HAS_NO_CLKDM
285 },
286 { },
287};
288
289static const struct omap_prm_data dra7_prm_data[] = {
290 {
291 .name = "mpu", .base = 0x4ae06300,
292 .pwrstctrl = 0x0, .pwrstst = 0x4, .dmap = &omap_prm_reton,
293 },
294 {
295 .name = "dsp1", .base = 0x4ae06400,
296 .pwrstctrl = 0x0, .pwrstst = 0x4, .dmap = &omap_prm_onoff_noauto,
297 .rstctrl = 0x10, .rstst = 0x14, .rstmap = rst_map_01,
298 },
299 {
300 .name = "ipu", .base = 0x4ae06500,
301 .pwrstctrl = 0x0, .pwrstst = 0x4, .dmap = &omap_prm_onoff_noauto,
302 .rstctrl = 0x10, .rstst = 0x14, .rstmap = rst_map_012,
303 .clkdm_name = "ipu1"
304 },
305 {
306 .name = "coreaon", .base = 0x4ae06628,
307 .pwrstctrl = 0x0, .pwrstst = 0x4, .dmap = &omap_prm_alwon,
308 },
309 {
310 .name = "core", .base = 0x4ae06700,
311 .pwrstctrl = 0x0, .pwrstst = 0x4, .dmap = &omap_prm_alwon,
312 .rstctrl = 0x210, .rstst = 0x214, .rstmap = rst_map_012,
313 .clkdm_name = "ipu2"
314 },
315 {
316 .name = "iva", .base = 0x4ae06f00,
317 .pwrstctrl = 0x0, .pwrstst = 0x4, .dmap = &omap_prm_onoff_noauto,
318 .rstctrl = 0x10, .rstst = 0x14, .rstmap = rst_map_012,
319 },
320 {
321 .name = "cam", .base = 0x4ae07000,
322 .pwrstctrl = 0x0, .pwrstst = 0x4, .dmap = &omap_prm_onoff_noauto,
323 },
324 {
325 .name = "dss", .base = 0x4ae07100,
326 .pwrstctrl = 0x0, .pwrstst = 0x4, .dmap = &omap_prm_onoff_noauto,
327 },
328 {
329 .name = "gpu", .base = 0x4ae07200,
330 .pwrstctrl = 0x0, .pwrstst = 0x4, .dmap = &omap_prm_onoff_noauto,
331 },
332 {
333 .name = "l3init", .base = 0x4ae07300,
334 .pwrstctrl = 0x0, .pwrstst = 0x4, .dmap = &omap_prm_alwon,
335 .rstctrl = 0x10, .rstst = 0x14, .rstmap = rst_map_012,
336 .clkdm_name = "pcie"
337 },
338 {
339 .name = "l4per", .base = 0x4ae07400,
340 .pwrstctrl = 0x0, .pwrstst = 0x4, .dmap = &omap_prm_alwon,
341 },
342 {
343 .name = "custefuse", .base = 0x4ae07600,
344 .pwrstctrl = 0x0, .pwrstst = 0x4, .dmap = &omap_prm_onoff_noauto,
345 },
346 {
347 .name = "wkupaon", .base = 0x4ae07724,
348 .pwrstctrl = 0x0, .pwrstst = 0x4, .dmap = &omap_prm_alwon,
349 },
350 {
351 .name = "emu", .base = 0x4ae07900,
352 .pwrstctrl = 0x0, .pwrstst = 0x4, .dmap = &omap_prm_onoff_noauto,
353 },
354 {
355 .name = "dsp2", .base = 0x4ae07b00,
356 .pwrstctrl = 0x0, .pwrstst = 0x4, .dmap = &omap_prm_onoff_noauto,
357 .rstctrl = 0x10, .rstst = 0x14, .rstmap = rst_map_01
358 },
359 {
360 .name = "eve1", .base = 0x4ae07b40,
361 .pwrstctrl = 0x0, .pwrstst = 0x4, .dmap = &omap_prm_onoff_noauto,
362 .rstctrl = 0x10, .rstst = 0x14, .rstmap = rst_map_01
363 },
364 {
365 .name = "eve2", .base = 0x4ae07b80,
366 .pwrstctrl = 0x0, .pwrstst = 0x4, .dmap = &omap_prm_onoff_noauto,
367 .rstctrl = 0x10, .rstst = 0x14, .rstmap = rst_map_01
368 },
369 {
370 .name = "eve3", .base = 0x4ae07bc0,
371 .pwrstctrl = 0x0, .pwrstst = 0x4, .dmap = &omap_prm_onoff_noauto,
372 .rstctrl = 0x10, .rstst = 0x14, .rstmap = rst_map_01
373 },
374 {
375 .name = "eve4", .base = 0x4ae07c00,
376 .pwrstctrl = 0x0, .pwrstst = 0x4, .dmap = &omap_prm_onoff_noauto,
377 .rstctrl = 0x10, .rstst = 0x14, .rstmap = rst_map_01
378 },
379 {
380 .name = "rtc", .base = 0x4ae07c60,
381 .pwrstctrl = 0x0, .pwrstst = 0x4, .dmap = &omap_prm_alwon,
382 },
383 {
384 .name = "vpe", .base = 0x4ae07c80,
385 .pwrstctrl = 0x0, .pwrstst = 0x4, .dmap = &omap_prm_onoff_noauto,
386 },
387 { },
388};
389
390static const struct omap_rst_map am3_per_rst_map[] = {
391 { .rst = 1 },
392 { .rst = -1 },
393};
394
395static const struct omap_rst_map am3_wkup_rst_map[] = {
396 { .rst = 3, .st = 5 },
397 { .rst = -1 },
398};
399
400static const struct omap_prm_data am3_prm_data[] = {
401 {
402 .name = "per", .base = 0x44e00c00,
403 .pwrstctrl = 0xc, .pwrstst = 0x8, .dmap = &omap_prm_noinact,
404 .rstctrl = 0x0, .rstmap = am3_per_rst_map,
405 .flags = OMAP_PRM_HAS_RSTCTRL, .clkdm_name = "pruss_ocp"
406 },
407 {
408 .name = "wkup", .base = 0x44e00d00,
409 .pwrstctrl = 0x4, .pwrstst = 0x4, .dmap = &omap_prm_alwon,
410 .rstctrl = 0x0, .rstst = 0xc, .rstmap = am3_wkup_rst_map,
411 .flags = OMAP_PRM_HAS_RSTCTRL | OMAP_PRM_HAS_NO_CLKDM
412 },
413 {
414 .name = "mpu", .base = 0x44e00e00,
415 .pwrstctrl = 0x0, .pwrstst = 0x4, .dmap = &omap_prm_noinact,
416 },
417 {
418 .name = "device", .base = 0x44e00f00,
419 .rstctrl = 0x0, .rstst = 0x8, .rstmap = rst_map_01,
420 .flags = OMAP_PRM_HAS_RSTCTRL | OMAP_PRM_HAS_NO_CLKDM
421 },
422 {
423 .name = "rtc", .base = 0x44e01000,
424 .pwrstctrl = 0x0, .pwrstst = 0x4, .dmap = &omap_prm_alwon,
425 },
426 {
427 .name = "gfx", .base = 0x44e01100,
428 .pwrstctrl = 0, .pwrstst = 0x10, .dmap = &omap_prm_noinact,
429 .rstctrl = 0x4, .rstst = 0x14, .rstmap = rst_map_0, .clkdm_name = "gfx_l3",
430 },
431 {
432 .name = "cefuse", .base = 0x44e01200,
433 .pwrstctrl = 0x0, .pwrstst = 0x4, .dmap = &omap_prm_onoff_noauto,
434 },
435 { },
436};
437
438static const struct omap_rst_map am4_per_rst_map[] = {
439 { .rst = 1, .st = 0 },
440 { .rst = -1 },
441};
442
443static const struct omap_rst_map am4_device_rst_map[] = {
444 { .rst = 0, .st = 1 },
445 { .rst = 1, .st = 0 },
446 { .rst = -1 },
447};
448
449static const struct omap_prm_data am4_prm_data[] = {
450 {
451 .name = "mpu", .base = 0x44df0300,
452 .pwrstctrl = 0x0, .pwrstst = 0x4, .dmap = &omap_prm_noinact,
453 },
454 {
455 .name = "gfx", .base = 0x44df0400,
456 .pwrstctrl = 0, .pwrstst = 0x4, .dmap = &omap_prm_onoff_noauto,
457 .rstctrl = 0x10, .rstst = 0x14, .rstmap = rst_map_0, .clkdm_name = "gfx_l3",
458 },
459 {
460 .name = "rtc", .base = 0x44df0500,
461 .pwrstctrl = 0x0, .pwrstst = 0x4, .dmap = &omap_prm_alwon,
462 },
463 {
464 .name = "tamper", .base = 0x44df0600,
465 .pwrstctrl = 0x0, .pwrstst = 0x4, .dmap = &omap_prm_alwon,
466 },
467 {
468 .name = "cefuse", .base = 0x44df0700,
469 .pwrstctrl = 0x0, .pwrstst = 0x4, .dmap = &omap_prm_onoff_noauto,
470 },
471 {
472 .name = "per", .base = 0x44df0800,
473 .pwrstctrl = 0x0, .pwrstst = 0x4, .dmap = &omap_prm_noinact,
474 .rstctrl = 0x10, .rstst = 0x14, .rstmap = am4_per_rst_map,
475 .clkdm_name = "pruss_ocp"
476 },
477 {
478 .name = "wkup", .base = 0x44df2000,
479 .pwrstctrl = 0x0, .pwrstst = 0x4, .dmap = &omap_prm_alwon,
480 .rstctrl = 0x10, .rstst = 0x14, .rstmap = am3_wkup_rst_map,
481 .flags = OMAP_PRM_HAS_NO_CLKDM
482 },
483 {
484 .name = "device", .base = 0x44df4000,
485 .rstctrl = 0x0, .rstst = 0x4, .rstmap = am4_device_rst_map,
486 .flags = OMAP_PRM_HAS_RSTCTRL | OMAP_PRM_HAS_NO_CLKDM
487 },
488 { },
489};
490
491static const struct of_device_id omap_prm_id_table[] = {
492 { .compatible = "ti,omap4-prm-inst", .data = omap4_prm_data },
493 { .compatible = "ti,omap5-prm-inst", .data = omap5_prm_data },
494 { .compatible = "ti,dra7-prm-inst", .data = dra7_prm_data },
495 { .compatible = "ti,am3-prm-inst", .data = am3_prm_data },
496 { .compatible = "ti,am4-prm-inst", .data = am4_prm_data },
497 { },
498};
499
500#ifdef DEBUG
501static void omap_prm_domain_show_state(struct omap_prm_domain *prmd,
502 const char *desc)
503{
504 dev_dbg(prmd->dev, "%s %s: %08x/%08x\n",
505 prmd->pd.name, desc,
506 readl_relaxed(prmd->prm->base + prmd->pwrstctrl),
507 readl_relaxed(prmd->prm->base + prmd->pwrstst));
508}
509#else
510static inline void omap_prm_domain_show_state(struct omap_prm_domain *prmd,
511 const char *desc)
512{
513}
514#endif
515
516static int omap_prm_domain_power_on(struct generic_pm_domain *domain)
517{
518 struct omap_prm_domain *prmd;
519 int ret;
520 u32 v;
521
522 prmd = genpd_to_prm_domain(domain);
523 if (!prmd->cap)
524 return 0;
525
526 omap_prm_domain_show_state(prmd, "on: previous state");
527
528 if (prmd->pwrstctrl_saved)
529 v = prmd->pwrstctrl_saved;
530 else
531 v = readl_relaxed(prmd->prm->base + prmd->pwrstctrl);
532
533 writel_relaxed(v | OMAP_PRMD_ON_ACTIVE,
534 prmd->prm->base + prmd->pwrstctrl);
535
536
537 ret = readl_relaxed_poll_timeout(prmd->prm->base + prmd->pwrstst,
538 v, !(v & PRM_ST_INTRANSITION), 1,
539 PRM_STATE_MAX_WAIT);
540 if (ret)
541 dev_err(prmd->dev, "%s: %s timed out\n",
542 prmd->pd.name, __func__);
543
544 omap_prm_domain_show_state(prmd, "on: new state");
545
546 return ret;
547}
548
549
550static int omap_prm_domain_find_lowest(struct omap_prm_domain *prmd)
551{
552 return __ffs(prmd->cap->usable_modes);
553}
554
555static int omap_prm_domain_power_off(struct generic_pm_domain *domain)
556{
557 struct omap_prm_domain *prmd;
558 int ret;
559 u32 v;
560
561 prmd = genpd_to_prm_domain(domain);
562 if (!prmd->cap)
563 return 0;
564
565 omap_prm_domain_show_state(prmd, "off: previous state");
566
567 v = readl_relaxed(prmd->prm->base + prmd->pwrstctrl);
568 prmd->pwrstctrl_saved = v;
569
570 v &= ~PRM_POWERSTATE_MASK;
571 v |= omap_prm_domain_find_lowest(prmd);
572
573 if (prmd->cap->statechange)
574 v |= PRM_LOWPOWERSTATECHANGE;
575 if (prmd->cap->logicretstate)
576 v &= ~PRM_LOGICRETSTATE;
577 else
578 v |= PRM_LOGICRETSTATE;
579
580 writel_relaxed(v, prmd->prm->base + prmd->pwrstctrl);
581
582
583 ret = readl_relaxed_poll_timeout(prmd->prm->base + prmd->pwrstst,
584 v, !(v & PRM_ST_INTRANSITION), 1,
585 PRM_STATE_MAX_WAIT);
586 if (ret)
587 dev_warn(prmd->dev, "%s: %s timed out\n",
588 __func__, prmd->pd.name);
589
590 omap_prm_domain_show_state(prmd, "off: new state");
591
592 return 0;
593}
594
595
596
597
598
599
600static int omap_prm_domain_attach_clock(struct device *dev,
601 struct omap_prm_domain *prmd)
602{
603 struct device_node *np = dev->of_node;
604 int error;
605
606 if (!of_device_is_compatible(np, "simple-pm-bus"))
607 return 0;
608
609 if (!of_property_read_bool(np, "clocks"))
610 return 0;
611
612 error = pm_clk_create(dev);
613 if (error)
614 return error;
615
616 error = of_pm_clk_add_clks(dev);
617 if (error < 0) {
618 pm_clk_destroy(dev);
619 return error;
620 }
621
622 prmd->uses_pm_clk = 1;
623
624 return 0;
625}
626
627static int omap_prm_domain_attach_dev(struct generic_pm_domain *domain,
628 struct device *dev)
629{
630 struct generic_pm_domain_data *genpd_data;
631 struct of_phandle_args pd_args;
632 struct omap_prm_domain *prmd;
633 struct device_node *np;
634 int ret;
635
636 prmd = genpd_to_prm_domain(domain);
637 np = dev->of_node;
638
639 ret = of_parse_phandle_with_args(np, "power-domains",
640 "#power-domain-cells", 0, &pd_args);
641 if (ret < 0)
642 return ret;
643
644 if (pd_args.args_count != 0)
645 dev_warn(dev, "%s: unusupported #power-domain-cells: %i\n",
646 prmd->pd.name, pd_args.args_count);
647
648 genpd_data = dev_gpd_data(dev);
649 genpd_data->data = NULL;
650
651 ret = omap_prm_domain_attach_clock(dev, prmd);
652 if (ret)
653 return ret;
654
655 return 0;
656}
657
658static void omap_prm_domain_detach_dev(struct generic_pm_domain *domain,
659 struct device *dev)
660{
661 struct generic_pm_domain_data *genpd_data;
662 struct omap_prm_domain *prmd;
663
664 prmd = genpd_to_prm_domain(domain);
665 if (prmd->uses_pm_clk)
666 pm_clk_destroy(dev);
667 genpd_data = dev_gpd_data(dev);
668 genpd_data->data = NULL;
669}
670
671static int omap_prm_domain_init(struct device *dev, struct omap_prm *prm)
672{
673 struct omap_prm_domain *prmd;
674 struct device_node *np = dev->of_node;
675 const struct omap_prm_data *data;
676 const char *name;
677 int error;
678
679 if (!of_find_property(dev->of_node, "#power-domain-cells", NULL))
680 return 0;
681
682 of_node_put(dev->of_node);
683
684 prmd = devm_kzalloc(dev, sizeof(*prmd), GFP_KERNEL);
685 if (!prmd)
686 return -ENOMEM;
687
688 data = prm->data;
689 name = devm_kasprintf(dev, GFP_KERNEL, "prm_%s",
690 data->name);
691
692 prmd->dev = dev;
693 prmd->prm = prm;
694 prmd->cap = prmd->prm->data->dmap;
695 prmd->pwrstctrl = prmd->prm->data->pwrstctrl;
696 prmd->pwrstst = prmd->prm->data->pwrstst;
697
698 prmd->pd.name = name;
699 prmd->pd.power_on = omap_prm_domain_power_on;
700 prmd->pd.power_off = omap_prm_domain_power_off;
701 prmd->pd.attach_dev = omap_prm_domain_attach_dev;
702 prmd->pd.detach_dev = omap_prm_domain_detach_dev;
703 prmd->pd.flags = GENPD_FLAG_PM_CLK;
704
705 pm_genpd_init(&prmd->pd, NULL, true);
706 error = of_genpd_add_provider_simple(np, &prmd->pd);
707 if (error)
708 pm_genpd_remove(&prmd->pd);
709 else
710 prm->prmd = prmd;
711
712 return error;
713}
714
715static bool _is_valid_reset(struct omap_reset_data *reset, unsigned long id)
716{
717 if (reset->mask & BIT(id))
718 return true;
719
720 return false;
721}
722
723static int omap_reset_get_st_bit(struct omap_reset_data *reset,
724 unsigned long id)
725{
726 const struct omap_rst_map *map = reset->prm->data->rstmap;
727
728 while (map->rst >= 0) {
729 if (map->rst == id)
730 return map->st;
731
732 map++;
733 }
734
735 return id;
736}
737
738static int omap_reset_status(struct reset_controller_dev *rcdev,
739 unsigned long id)
740{
741 struct omap_reset_data *reset = to_omap_reset_data(rcdev);
742 u32 v;
743 int st_bit = omap_reset_get_st_bit(reset, id);
744 bool has_rstst = reset->prm->data->rstst ||
745 (reset->prm->data->flags & OMAP_PRM_HAS_RSTST);
746
747
748 if (!has_rstst)
749 return -ENOTSUPP;
750
751
752 v = readl_relaxed(reset->prm->base + reset->prm->data->rstctrl);
753 if (v & BIT(id))
754 return 1;
755
756
757
758
759
760 v = readl_relaxed(reset->prm->base + reset->prm->data->rstst);
761 v >>= st_bit;
762 v &= 1;
763
764 return !v;
765}
766
767static int omap_reset_assert(struct reset_controller_dev *rcdev,
768 unsigned long id)
769{
770 struct omap_reset_data *reset = to_omap_reset_data(rcdev);
771 u32 v;
772 unsigned long flags;
773
774
775 spin_lock_irqsave(&reset->lock, flags);
776 v = readl_relaxed(reset->prm->base + reset->prm->data->rstctrl);
777 v |= 1 << id;
778 writel_relaxed(v, reset->prm->base + reset->prm->data->rstctrl);
779 spin_unlock_irqrestore(&reset->lock, flags);
780
781 return 0;
782}
783
784static int omap_reset_deassert(struct reset_controller_dev *rcdev,
785 unsigned long id)
786{
787 struct omap_reset_data *reset = to_omap_reset_data(rcdev);
788 u32 v;
789 int st_bit;
790 bool has_rstst;
791 unsigned long flags;
792 struct ti_prm_platform_data *pdata = dev_get_platdata(reset->dev);
793 int ret = 0;
794
795
796 if (!omap_reset_status(rcdev, id))
797 return 0;
798
799 has_rstst = reset->prm->data->rstst ||
800 (reset->prm->data->flags & OMAP_PRM_HAS_RSTST);
801
802 if (has_rstst) {
803 st_bit = omap_reset_get_st_bit(reset, id);
804
805
806 v = 1 << st_bit;
807 writel_relaxed(v, reset->prm->base + reset->prm->data->rstst);
808 }
809
810 if (reset->clkdm)
811 pdata->clkdm_deny_idle(reset->clkdm);
812
813
814 spin_lock_irqsave(&reset->lock, flags);
815 v = readl_relaxed(reset->prm->base + reset->prm->data->rstctrl);
816 v &= ~(1 << id);
817 writel_relaxed(v, reset->prm->base + reset->prm->data->rstctrl);
818 spin_unlock_irqrestore(&reset->lock, flags);
819
820 if (!has_rstst)
821 goto exit;
822
823
824 ret = readl_relaxed_poll_timeout_atomic(reset->prm->base +
825 reset->prm->data->rstst,
826 v, v & BIT(st_bit), 1,
827 OMAP_RESET_MAX_WAIT);
828 if (ret)
829 pr_err("%s: timedout waiting for %s:%lu\n", __func__,
830 reset->prm->data->name, id);
831
832exit:
833 if (reset->clkdm)
834 pdata->clkdm_allow_idle(reset->clkdm);
835
836 return ret;
837}
838
839static const struct reset_control_ops omap_reset_ops = {
840 .assert = omap_reset_assert,
841 .deassert = omap_reset_deassert,
842 .status = omap_reset_status,
843};
844
845static int omap_prm_reset_xlate(struct reset_controller_dev *rcdev,
846 const struct of_phandle_args *reset_spec)
847{
848 struct omap_reset_data *reset = to_omap_reset_data(rcdev);
849
850 if (!_is_valid_reset(reset, reset_spec->args[0]))
851 return -EINVAL;
852
853 return reset_spec->args[0];
854}
855
856static int omap_prm_reset_init(struct platform_device *pdev,
857 struct omap_prm *prm)
858{
859 struct omap_reset_data *reset;
860 const struct omap_rst_map *map;
861 struct ti_prm_platform_data *pdata = dev_get_platdata(&pdev->dev);
862 char buf[32];
863 u32 v;
864
865
866
867
868
869
870 if (!prm->data->rstctrl && !(prm->data->flags & OMAP_PRM_HAS_RSTCTRL))
871 return 0;
872
873
874 if (!pdata || !pdata->clkdm_lookup || !pdata->clkdm_deny_idle ||
875 !pdata->clkdm_allow_idle)
876 return -EINVAL;
877
878 map = prm->data->rstmap;
879 if (!map)
880 return -EINVAL;
881
882 reset = devm_kzalloc(&pdev->dev, sizeof(*reset), GFP_KERNEL);
883 if (!reset)
884 return -ENOMEM;
885
886 reset->rcdev.owner = THIS_MODULE;
887 reset->rcdev.ops = &omap_reset_ops;
888 reset->rcdev.of_node = pdev->dev.of_node;
889 reset->rcdev.nr_resets = OMAP_MAX_RESETS;
890 reset->rcdev.of_xlate = omap_prm_reset_xlate;
891 reset->rcdev.of_reset_n_cells = 1;
892 reset->dev = &pdev->dev;
893 spin_lock_init(&reset->lock);
894
895 reset->prm = prm;
896
897 sprintf(buf, "%s_clkdm", prm->data->clkdm_name ? prm->data->clkdm_name :
898 prm->data->name);
899
900 if (!(prm->data->flags & OMAP_PRM_HAS_NO_CLKDM)) {
901 reset->clkdm = pdata->clkdm_lookup(buf);
902 if (!reset->clkdm)
903 return -EINVAL;
904 }
905
906 while (map->rst >= 0) {
907 reset->mask |= BIT(map->rst);
908 map++;
909 }
910
911
912 if (prm->data->rstmap == rst_map_012) {
913 v = readl_relaxed(reset->prm->base + reset->prm->data->rstctrl);
914 if ((v & reset->mask) != reset->mask) {
915 dev_dbg(&pdev->dev, "Asserting all resets: %08x\n", v);
916 writel_relaxed(reset->mask, reset->prm->base +
917 reset->prm->data->rstctrl);
918 }
919 }
920
921 return devm_reset_controller_register(&pdev->dev, &reset->rcdev);
922}
923
924static int omap_prm_probe(struct platform_device *pdev)
925{
926 struct resource *res;
927 const struct omap_prm_data *data;
928 struct omap_prm *prm;
929 const struct of_device_id *match;
930 int ret;
931
932 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
933 if (!res)
934 return -ENODEV;
935
936 match = of_match_device(omap_prm_id_table, &pdev->dev);
937 if (!match)
938 return -ENOTSUPP;
939
940 prm = devm_kzalloc(&pdev->dev, sizeof(*prm), GFP_KERNEL);
941 if (!prm)
942 return -ENOMEM;
943
944 data = match->data;
945
946 while (data->base != res->start) {
947 if (!data->base)
948 return -EINVAL;
949 data++;
950 }
951
952 prm->data = data;
953
954 prm->base = devm_ioremap_resource(&pdev->dev, res);
955 if (IS_ERR(prm->base))
956 return PTR_ERR(prm->base);
957
958 ret = omap_prm_domain_init(&pdev->dev, prm);
959 if (ret)
960 return ret;
961
962 ret = omap_prm_reset_init(pdev, prm);
963 if (ret)
964 goto err_domain;
965
966 return 0;
967
968err_domain:
969 of_genpd_del_provider(pdev->dev.of_node);
970 pm_genpd_remove(&prm->prmd->pd);
971
972 return ret;
973}
974
975static struct platform_driver omap_prm_driver = {
976 .probe = omap_prm_probe,
977 .driver = {
978 .name = KBUILD_MODNAME,
979 .of_match_table = omap_prm_id_table,
980 },
981};
982builtin_platform_driver(omap_prm_driver);
983