xref: /linux/drivers/video/fbdev/omap2/omapfb/dss/dss.c (revision d59fec29b131f30b27343d54bdf1071ee98eda8e) 
1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3  * linux/drivers/video/omap2/dss/dss.c
4  *
5  * Copyright (C) 2009 Nokia Corporation
6  * Author: Tomi Valkeinen <tomi.valkeinen@nokia.com>
7  *
8  * Some code and ideas taken from drivers/video/omap/ driver
9  * by Imre Deak.
10  */
11 
12 #define DSS_SUBSYS_NAME "DSS"
13 
14 #include <linux/kernel.h>
15 #include <linux/module.h>
16 #include <linux/io.h>
17 #include <linux/export.h>
18 #include <linux/err.h>
19 #include <linux/delay.h>
20 #include <linux/seq_file.h>
21 #include <linux/clk.h>
22 #include <linux/platform_device.h>
23 #include <linux/pm_runtime.h>
24 #include <linux/gfp.h>
25 #include <linux/sizes.h>
26 #include <linux/mfd/syscon.h>
27 #include <linux/regmap.h>
28 #include <linux/of.h>
29 #include <linux/regulator/consumer.h>
30 #include <linux/suspend.h>
31 #include <linux/component.h>
32 #include <linux/pinctrl/consumer.h>
33 
34 #include <video/omapfb_dss.h>
35 
36 #include "dss.h"
37 #include "dss_features.h"
38 
39 #define DSS_SZ_REGS			SZ_512
40 
41 struct dss_reg {
42 	u16 idx;
43 };
44 
45 #define DSS_REG(idx)			((const struct dss_reg) { idx })
46 
47 #define DSS_REVISION			DSS_REG(0x0000)
48 #define DSS_SYSCONFIG			DSS_REG(0x0010)
49 #define DSS_SYSSTATUS			DSS_REG(0x0014)
50 #define DSS_CONTROL			DSS_REG(0x0040)
51 #define DSS_SDI_CONTROL			DSS_REG(0x0044)
52 #define DSS_PLL_CONTROL			DSS_REG(0x0048)
53 #define DSS_SDI_STATUS			DSS_REG(0x005C)
54 
55 #define REG_GET(idx, start, end) \
56 	FLD_GET(dss_read_reg(idx), start, end)
57 
58 #define REG_FLD_MOD(idx, val, start, end) \
59 	dss_write_reg(idx, FLD_MOD(dss_read_reg(idx), val, start, end))
60 
61 struct dss_features {
62 	u8 fck_div_max;
63 	u8 dss_fck_multiplier;
64 	const char *parent_clk_name;
65 	const enum omap_display_type *ports;
66 	int num_ports;
67 	int (*dpi_select_source)(int port, enum omap_channel channel);
68 };
69 
70 static struct {
71 	struct platform_device *pdev;
72 	void __iomem    *base;
73 	struct regmap	*syscon_pll_ctrl;
74 	u32		syscon_pll_ctrl_offset;
75 
76 	struct clk	*parent_clk;
77 	struct clk	*dss_clk;
78 	unsigned long	dss_clk_rate;
79 
80 	unsigned long	cache_req_pck;
81 	unsigned long	cache_prate;
82 	struct dispc_clock_info cache_dispc_cinfo;
83 
84 	enum omap_dss_clk_source dsi_clk_source[MAX_NUM_DSI];
85 	enum omap_dss_clk_source dispc_clk_source;
86 	enum omap_dss_clk_source lcd_clk_source[MAX_DSS_LCD_MANAGERS];
87 
88 	bool		ctx_valid;
89 	u32		ctx[DSS_SZ_REGS / sizeof(u32)];
90 
91 	const struct dss_features *feat;
92 
93 	struct dss_pll	*video1_pll;
94 	struct dss_pll	*video2_pll;
95 } dss;
96 
97 static const char * const dss_generic_clk_source_names[] = {
98 	[OMAP_DSS_CLK_SRC_DSI_PLL_HSDIV_DISPC]	= "DSI_PLL_HSDIV_DISPC",
99 	[OMAP_DSS_CLK_SRC_DSI_PLL_HSDIV_DSI]	= "DSI_PLL_HSDIV_DSI",
100 	[OMAP_DSS_CLK_SRC_FCK]			= "DSS_FCK",
101 	[OMAP_DSS_CLK_SRC_DSI2_PLL_HSDIV_DISPC]	= "DSI_PLL2_HSDIV_DISPC",
102 	[OMAP_DSS_CLK_SRC_DSI2_PLL_HSDIV_DSI]	= "DSI_PLL2_HSDIV_DSI",
103 };
104 
105 static bool dss_initialized;
106 
107 bool omapdss_is_initialized(void)
108 {
109 	return dss_initialized;
110 }
111 EXPORT_SYMBOL(omapdss_is_initialized);
112 
113 static inline void dss_write_reg(const struct dss_reg idx, u32 val)
114 {
115 	__raw_writel(val, dss.base + idx.idx);
116 }
117 
118 static inline u32 dss_read_reg(const struct dss_reg idx)
119 {
120 	return __raw_readl(dss.base + idx.idx);
121 }
122 
123 #define SR(reg) \
124 	dss.ctx[(DSS_##reg).idx / sizeof(u32)] = dss_read_reg(DSS_##reg)
125 #define RR(reg) \
126 	dss_write_reg(DSS_##reg, dss.ctx[(DSS_##reg).idx / sizeof(u32)])
127 
128 static void dss_save_context(void)
129 {
130 	DSSDBG("dss_save_context\n");
131 
132 	SR(CONTROL);
133 
134 	if (dss_feat_get_supported_displays(OMAP_DSS_CHANNEL_LCD) &
135 			OMAP_DISPLAY_TYPE_SDI) {
136 		SR(SDI_CONTROL);
137 		SR(PLL_CONTROL);
138 	}
139 
140 	dss.ctx_valid = true;
141 
142 	DSSDBG("context saved\n");
143 }
144 
145 static void dss_restore_context(void)
146 {
147 	DSSDBG("dss_restore_context\n");
148 
149 	if (!dss.ctx_valid)
150 		return;
151 
152 	RR(CONTROL);
153 
154 	if (dss_feat_get_supported_displays(OMAP_DSS_CHANNEL_LCD) &
155 			OMAP_DISPLAY_TYPE_SDI) {
156 		RR(SDI_CONTROL);
157 		RR(PLL_CONTROL);
158 	}
159 
160 	DSSDBG("context restored\n");
161 }
162 
163 #undef SR
164 #undef RR
165 
166 void dss_ctrl_pll_enable(enum dss_pll_id pll_id, bool enable)
167 {
168 	unsigned shift;
169 	unsigned val;
170 
171 	if (!dss.syscon_pll_ctrl)
172 		return;
173 
174 	val = !enable;
175 
176 	switch (pll_id) {
177 	case DSS_PLL_VIDEO1:
178 		shift = 0;
179 		break;
180 	case DSS_PLL_VIDEO2:
181 		shift = 1;
182 		break;
183 	case DSS_PLL_HDMI:
184 		shift = 2;
185 		break;
186 	default:
187 		DSSERR("illegal DSS PLL ID %d\n", pll_id);
188 		return;
189 	}
190 
191 	regmap_update_bits(dss.syscon_pll_ctrl, dss.syscon_pll_ctrl_offset,
192 		1 << shift, val << shift);
193 }
194 
195 void dss_ctrl_pll_set_control_mux(enum dss_pll_id pll_id,
196 	enum omap_channel channel)
197 {
198 	unsigned shift, val;
199 
200 	if (!dss.syscon_pll_ctrl)
201 		return;
202 
203 	switch (channel) {
204 	case OMAP_DSS_CHANNEL_LCD:
205 		shift = 3;
206 
207 		switch (pll_id) {
208 		case DSS_PLL_VIDEO1:
209 			val = 0; break;
210 		case DSS_PLL_HDMI:
211 			val = 1; break;
212 		default:
213 			DSSERR("error in PLL mux config for LCD\n");
214 			return;
215 		}
216 
217 		break;
218 	case OMAP_DSS_CHANNEL_LCD2:
219 		shift = 5;
220 
221 		switch (pll_id) {
222 		case DSS_PLL_VIDEO1:
223 			val = 0; break;
224 		case DSS_PLL_VIDEO2:
225 			val = 1; break;
226 		case DSS_PLL_HDMI:
227 			val = 2; break;
228 		default:
229 			DSSERR("error in PLL mux config for LCD2\n");
230 			return;
231 		}
232 
233 		break;
234 	case OMAP_DSS_CHANNEL_LCD3:
235 		shift = 7;
236 
237 		switch (pll_id) {
238 		case DSS_PLL_VIDEO1:
239 			val = 1; break;
240 		case DSS_PLL_VIDEO2:
241 			val = 0; break;
242 		case DSS_PLL_HDMI:
243 			val = 2; break;
244 		default:
245 			DSSERR("error in PLL mux config for LCD3\n");
246 			return;
247 		}
248 
249 		break;
250 	default:
251 		DSSERR("error in PLL mux config\n");
252 		return;
253 	}
254 
255 	regmap_update_bits(dss.syscon_pll_ctrl, dss.syscon_pll_ctrl_offset,
256 		0x3 << shift, val << shift);
257 }
258 
259 void dss_sdi_init(int datapairs)
260 {
261 	u32 l;
262 
263 	BUG_ON(datapairs > 3 || datapairs < 1);
264 
265 	l = dss_read_reg(DSS_SDI_CONTROL);
266 	l = FLD_MOD(l, 0xf, 19, 15);		/* SDI_PDIV */
267 	l = FLD_MOD(l, datapairs-1, 3, 2);	/* SDI_PRSEL */
268 	l = FLD_MOD(l, 2, 1, 0);		/* SDI_BWSEL */
269 	dss_write_reg(DSS_SDI_CONTROL, l);
270 
271 	l = dss_read_reg(DSS_PLL_CONTROL);
272 	l = FLD_MOD(l, 0x7, 25, 22);	/* SDI_PLL_FREQSEL */
273 	l = FLD_MOD(l, 0xb, 16, 11);	/* SDI_PLL_REGN */
274 	l = FLD_MOD(l, 0xb4, 10, 1);	/* SDI_PLL_REGM */
275 	dss_write_reg(DSS_PLL_CONTROL, l);
276 }
277 
278 int dss_sdi_enable(void)
279 {
280 	unsigned long timeout;
281 
282 	dispc_pck_free_enable(1);
283 
284 	/* Reset SDI PLL */
285 	REG_FLD_MOD(DSS_PLL_CONTROL, 1, 18, 18); /* SDI_PLL_SYSRESET */
286 	udelay(1);	/* wait 2x PCLK */
287 
288 	/* Lock SDI PLL */
289 	REG_FLD_MOD(DSS_PLL_CONTROL, 1, 28, 28); /* SDI_PLL_GOBIT */
290 
291 	/* Waiting for PLL lock request to complete */
292 	timeout = jiffies + msecs_to_jiffies(500);
293 	while (dss_read_reg(DSS_SDI_STATUS) & (1 << 6)) {
294 		if (time_after_eq(jiffies, timeout)) {
295 			DSSERR("PLL lock request timed out\n");
296 			goto err1;
297 		}
298 	}
299 
300 	/* Clearing PLL_GO bit */
301 	REG_FLD_MOD(DSS_PLL_CONTROL, 0, 28, 28);
302 
303 	/* Waiting for PLL to lock */
304 	timeout = jiffies + msecs_to_jiffies(500);
305 	while (!(dss_read_reg(DSS_SDI_STATUS) & (1 << 5))) {
306 		if (time_after_eq(jiffies, timeout)) {
307 			DSSERR("PLL lock timed out\n");
308 			goto err1;
309 		}
310 	}
311 
312 	dispc_lcd_enable_signal(1);
313 
314 	/* Waiting for SDI reset to complete */
315 	timeout = jiffies + msecs_to_jiffies(500);
316 	while (!(dss_read_reg(DSS_SDI_STATUS) & (1 << 2))) {
317 		if (time_after_eq(jiffies, timeout)) {
318 			DSSERR("SDI reset timed out\n");
319 			goto err2;
320 		}
321 	}
322 
323 	return 0;
324 
325  err2:
326 	dispc_lcd_enable_signal(0);
327  err1:
328 	/* Reset SDI PLL */
329 	REG_FLD_MOD(DSS_PLL_CONTROL, 0, 18, 18); /* SDI_PLL_SYSRESET */
330 
331 	dispc_pck_free_enable(0);
332 
333 	return -ETIMEDOUT;
334 }
335 
336 void dss_sdi_disable(void)
337 {
338 	dispc_lcd_enable_signal(0);
339 
340 	dispc_pck_free_enable(0);
341 
342 	/* Reset SDI PLL */
343 	REG_FLD_MOD(DSS_PLL_CONTROL, 0, 18, 18); /* SDI_PLL_SYSRESET */
344 }
345 
346 const char *dss_get_generic_clk_source_name(enum omap_dss_clk_source clk_src)
347 {
348 	return dss_generic_clk_source_names[clk_src];
349 }
350 
351 void dss_dump_clocks(struct seq_file *s)
352 {
353 	const char *fclk_name, *fclk_real_name;
354 	unsigned long fclk_rate;
355 
356 	if (dss_runtime_get())
357 		return;
358 
359 	seq_printf(s, "- DSS -\n");
360 
361 	fclk_name = dss_get_generic_clk_source_name(OMAP_DSS_CLK_SRC_FCK);
362 	fclk_real_name = dss_feat_get_clk_source_name(OMAP_DSS_CLK_SRC_FCK);
363 	fclk_rate = clk_get_rate(dss.dss_clk);
364 
365 	seq_printf(s, "%s (%s) = %lu\n",
366 			fclk_name, fclk_real_name,
367 			fclk_rate);
368 
369 	dss_runtime_put();
370 }
371 
372 static void dss_dump_regs(struct seq_file *s)
373 {
374 #define DUMPREG(r) seq_printf(s, "%-35s %08x\n", #r, dss_read_reg(r))
375 
376 	if (dss_runtime_get())
377 		return;
378 
379 	DUMPREG(DSS_REVISION);
380 	DUMPREG(DSS_SYSCONFIG);
381 	DUMPREG(DSS_SYSSTATUS);
382 	DUMPREG(DSS_CONTROL);
383 
384 	if (dss_feat_get_supported_displays(OMAP_DSS_CHANNEL_LCD) &
385 			OMAP_DISPLAY_TYPE_SDI) {
386 		DUMPREG(DSS_SDI_CONTROL);
387 		DUMPREG(DSS_PLL_CONTROL);
388 		DUMPREG(DSS_SDI_STATUS);
389 	}
390 
391 	dss_runtime_put();
392 #undef DUMPREG
393 }
394 
395 static void dss_select_dispc_clk_source(enum omap_dss_clk_source clk_src)
396 {
397 	int b;
398 	u8 start, end;
399 
400 	switch (clk_src) {
401 	case OMAP_DSS_CLK_SRC_FCK:
402 		b = 0;
403 		break;
404 	case OMAP_DSS_CLK_SRC_DSI_PLL_HSDIV_DISPC:
405 		b = 1;
406 		break;
407 	case OMAP_DSS_CLK_SRC_DSI2_PLL_HSDIV_DISPC:
408 		b = 2;
409 		break;
410 	default:
411 		BUG();
412 		return;
413 	}
414 
415 	dss_feat_get_reg_field(FEAT_REG_DISPC_CLK_SWITCH, &start, &end);
416 
417 	REG_FLD_MOD(DSS_CONTROL, b, start, end);	/* DISPC_CLK_SWITCH */
418 
419 	dss.dispc_clk_source = clk_src;
420 }
421 
422 void dss_select_dsi_clk_source(int dsi_module,
423 		enum omap_dss_clk_source clk_src)
424 {
425 	int b, pos;
426 
427 	switch (clk_src) {
428 	case OMAP_DSS_CLK_SRC_FCK:
429 		b = 0;
430 		break;
431 	case OMAP_DSS_CLK_SRC_DSI_PLL_HSDIV_DSI:
432 		BUG_ON(dsi_module != 0);
433 		b = 1;
434 		break;
435 	case OMAP_DSS_CLK_SRC_DSI2_PLL_HSDIV_DSI:
436 		BUG_ON(dsi_module != 1);
437 		b = 1;
438 		break;
439 	default:
440 		BUG();
441 		return;
442 	}
443 
444 	pos = dsi_module == 0 ? 1 : 10;
445 	REG_FLD_MOD(DSS_CONTROL, b, pos, pos);	/* DSIx_CLK_SWITCH */
446 
447 	dss.dsi_clk_source[dsi_module] = clk_src;
448 }
449 
450 void dss_select_lcd_clk_source(enum omap_channel channel,
451 		enum omap_dss_clk_source clk_src)
452 {
453 	int b, ix, pos;
454 
455 	if (!dss_has_feature(FEAT_LCD_CLK_SRC)) {
456 		dss_select_dispc_clk_source(clk_src);
457 		return;
458 	}
459 
460 	switch (clk_src) {
461 	case OMAP_DSS_CLK_SRC_FCK:
462 		b = 0;
463 		break;
464 	case OMAP_DSS_CLK_SRC_DSI_PLL_HSDIV_DISPC:
465 		BUG_ON(channel != OMAP_DSS_CHANNEL_LCD);
466 		b = 1;
467 		break;
468 	case OMAP_DSS_CLK_SRC_DSI2_PLL_HSDIV_DISPC:
469 		BUG_ON(channel != OMAP_DSS_CHANNEL_LCD2 &&
470 		       channel != OMAP_DSS_CHANNEL_LCD3);
471 		b = 1;
472 		break;
473 	default:
474 		BUG();
475 		return;
476 	}
477 
478 	pos = channel == OMAP_DSS_CHANNEL_LCD ? 0 :
479 	     (channel == OMAP_DSS_CHANNEL_LCD2 ? 12 : 19);
480 	REG_FLD_MOD(DSS_CONTROL, b, pos, pos);	/* LCDx_CLK_SWITCH */
481 
482 	ix = channel == OMAP_DSS_CHANNEL_LCD ? 0 :
483 	    (channel == OMAP_DSS_CHANNEL_LCD2 ? 1 : 2);
484 	dss.lcd_clk_source[ix] = clk_src;
485 }
486 
487 enum omap_dss_clk_source dss_get_dispc_clk_source(void)
488 {
489 	return dss.dispc_clk_source;
490 }
491 
492 enum omap_dss_clk_source dss_get_dsi_clk_source(int dsi_module)
493 {
494 	return dss.dsi_clk_source[dsi_module];
495 }
496 
497 enum omap_dss_clk_source dss_get_lcd_clk_source(enum omap_channel channel)
498 {
499 	if (dss_has_feature(FEAT_LCD_CLK_SRC)) {
500 		int ix = channel == OMAP_DSS_CHANNEL_LCD ? 0 :
501 			(channel == OMAP_DSS_CHANNEL_LCD2 ? 1 : 2);
502 		return dss.lcd_clk_source[ix];
503 	} else {
504 		/* LCD_CLK source is the same as DISPC_FCLK source for
505 		 * OMAP2 and OMAP3 */
506 		return dss.dispc_clk_source;
507 	}
508 }
509 
510 bool dss_div_calc(unsigned long pck, unsigned long fck_min,
511 		dss_div_calc_func func, void *data)
512 {
513 	int fckd, fckd_start, fckd_stop;
514 	unsigned long fck;
515 	unsigned long fck_hw_max;
516 	unsigned long fckd_hw_max;
517 	unsigned long prate;
518 	unsigned m;
519 
520 	fck_hw_max = dss_feat_get_param_max(FEAT_PARAM_DSS_FCK);
521 
522 	if (dss.parent_clk == NULL) {
523 		unsigned pckd;
524 
525 		pckd = fck_hw_max / pck;
526 
527 		fck = pck * pckd;
528 
529 		fck = clk_round_rate(dss.dss_clk, fck);
530 
531 		return func(fck, data);
532 	}
533 
534 	fckd_hw_max = dss.feat->fck_div_max;
535 
536 	m = dss.feat->dss_fck_multiplier;
537 	prate = clk_get_rate(dss.parent_clk);
538 
539 	fck_min = fck_min ? fck_min : 1;
540 
541 	fckd_start = min(prate * m / fck_min, fckd_hw_max);
542 	fckd_stop = max(DIV_ROUND_UP(prate * m, fck_hw_max), 1ul);
543 
544 	for (fckd = fckd_start; fckd >= fckd_stop; --fckd) {
545 		fck = DIV_ROUND_UP(prate, fckd) * m;
546 
547 		if (func(fck, data))
548 			return true;
549 	}
550 
551 	return false;
552 }
553 
554 int dss_set_fck_rate(unsigned long rate)
555 {
556 	int r;
557 
558 	DSSDBG("set fck to %lu\n", rate);
559 
560 	r = clk_set_rate(dss.dss_clk, rate);
561 	if (r)
562 		return r;
563 
564 	dss.dss_clk_rate = clk_get_rate(dss.dss_clk);
565 
566 	WARN_ONCE(dss.dss_clk_rate != rate,
567 			"clk rate mismatch: %lu != %lu", dss.dss_clk_rate,
568 			rate);
569 
570 	return 0;
571 }
572 
573 unsigned long dss_get_dispc_clk_rate(void)
574 {
575 	return dss.dss_clk_rate;
576 }
577 
578 static int dss_setup_default_clock(void)
579 {
580 	unsigned long max_dss_fck, prate;
581 	unsigned long fck;
582 	unsigned fck_div;
583 	int r;
584 
585 	max_dss_fck = dss_feat_get_param_max(FEAT_PARAM_DSS_FCK);
586 
587 	if (dss.parent_clk == NULL) {
588 		fck = clk_round_rate(dss.dss_clk, max_dss_fck);
589 	} else {
590 		prate = clk_get_rate(dss.parent_clk);
591 
592 		fck_div = DIV_ROUND_UP(prate * dss.feat->dss_fck_multiplier,
593 				max_dss_fck);
594 		fck = DIV_ROUND_UP(prate, fck_div) * dss.feat->dss_fck_multiplier;
595 	}
596 
597 	r = dss_set_fck_rate(fck);
598 	if (r)
599 		return r;
600 
601 	return 0;
602 }
603 
604 void dss_set_venc_output(enum omap_dss_venc_type type)
605 {
606 	int l = 0;
607 
608 	if (type == OMAP_DSS_VENC_TYPE_COMPOSITE)
609 		l = 0;
610 	else if (type == OMAP_DSS_VENC_TYPE_SVIDEO)
611 		l = 1;
612 	else
613 		BUG();
614 
615 	/* venc out selection. 0 = comp, 1 = svideo */
616 	REG_FLD_MOD(DSS_CONTROL, l, 6, 6);
617 }
618 
619 void dss_set_dac_pwrdn_bgz(bool enable)
620 {
621 	REG_FLD_MOD(DSS_CONTROL, enable, 5, 5);	/* DAC Power-Down Control */
622 }
623 
624 void dss_select_hdmi_venc_clk_source(enum dss_hdmi_venc_clk_source_select src)
625 {
626 	enum omap_display_type dp;
627 	dp = dss_feat_get_supported_displays(OMAP_DSS_CHANNEL_DIGIT);
628 
629 	/* Complain about invalid selections */
630 	WARN_ON((src == DSS_VENC_TV_CLK) && !(dp & OMAP_DISPLAY_TYPE_VENC));
631 	WARN_ON((src == DSS_HDMI_M_PCLK) && !(dp & OMAP_DISPLAY_TYPE_HDMI));
632 
633 	/* Select only if we have options */
634 	if ((dp & OMAP_DISPLAY_TYPE_VENC) && (dp & OMAP_DISPLAY_TYPE_HDMI))
635 		REG_FLD_MOD(DSS_CONTROL, src, 15, 15);	/* VENC_HDMI_SWITCH */
636 }
637 
638 enum dss_hdmi_venc_clk_source_select dss_get_hdmi_venc_clk_source(void)
639 {
640 	enum omap_display_type displays;
641 
642 	displays = dss_feat_get_supported_displays(OMAP_DSS_CHANNEL_DIGIT);
643 	if ((displays & OMAP_DISPLAY_TYPE_HDMI) == 0)
644 		return DSS_VENC_TV_CLK;
645 
646 	if ((displays & OMAP_DISPLAY_TYPE_VENC) == 0)
647 		return DSS_HDMI_M_PCLK;
648 
649 	return REG_GET(DSS_CONTROL, 15, 15);
650 }
651 
652 static int dss_dpi_select_source_omap2_omap3(int port, enum omap_channel channel)
653 {
654 	if (channel != OMAP_DSS_CHANNEL_LCD)
655 		return -EINVAL;
656 
657 	return 0;
658 }
659 
660 static int dss_dpi_select_source_omap4(int port, enum omap_channel channel)
661 {
662 	int val;
663 
664 	switch (channel) {
665 	case OMAP_DSS_CHANNEL_LCD2:
666 		val = 0;
667 		break;
668 	case OMAP_DSS_CHANNEL_DIGIT:
669 		val = 1;
670 		break;
671 	default:
672 		return -EINVAL;
673 	}
674 
675 	REG_FLD_MOD(DSS_CONTROL, val, 17, 17);
676 
677 	return 0;
678 }
679 
680 static int dss_dpi_select_source_omap5(int port, enum omap_channel channel)
681 {
682 	int val;
683 
684 	switch (channel) {
685 	case OMAP_DSS_CHANNEL_LCD:
686 		val = 1;
687 		break;
688 	case OMAP_DSS_CHANNEL_LCD2:
689 		val = 2;
690 		break;
691 	case OMAP_DSS_CHANNEL_LCD3:
692 		val = 3;
693 		break;
694 	case OMAP_DSS_CHANNEL_DIGIT:
695 		val = 0;
696 		break;
697 	default:
698 		return -EINVAL;
699 	}
700 
701 	REG_FLD_MOD(DSS_CONTROL, val, 17, 16);
702 
703 	return 0;
704 }
705 
706 static int dss_dpi_select_source_dra7xx(int port, enum omap_channel channel)
707 {
708 	switch (port) {
709 	case 0:
710 		return dss_dpi_select_source_omap5(port, channel);
711 	case 1:
712 		if (channel != OMAP_DSS_CHANNEL_LCD2)
713 			return -EINVAL;
714 		break;
715 	case 2:
716 		if (channel != OMAP_DSS_CHANNEL_LCD3)
717 			return -EINVAL;
718 		break;
719 	default:
720 		return -EINVAL;
721 	}
722 
723 	return 0;
724 }
725 
726 int dss_dpi_select_source(int port, enum omap_channel channel)
727 {
728 	return dss.feat->dpi_select_source(port, channel);
729 }
730 
731 static int dss_get_clocks(void)
732 {
733 	struct clk *clk;
734 
735 	clk = devm_clk_get(&dss.pdev->dev, "fck");
736 	if (IS_ERR(clk)) {
737 		DSSERR("can't get clock fck\n");
738 		return PTR_ERR(clk);
739 	}
740 
741 	dss.dss_clk = clk;
742 
743 	if (dss.feat->parent_clk_name) {
744 		clk = clk_get(NULL, dss.feat->parent_clk_name);
745 		if (IS_ERR(clk)) {
746 			DSSERR("Failed to get %s\n", dss.feat->parent_clk_name);
747 			return PTR_ERR(clk);
748 		}
749 	} else {
750 		clk = NULL;
751 	}
752 
753 	dss.parent_clk = clk;
754 
755 	return 0;
756 }
757 
758 static void dss_put_clocks(void)
759 {
760 	if (dss.parent_clk)
761 		clk_put(dss.parent_clk);
762 }
763 
764 int dss_runtime_get(void)
765 {
766 	int r;
767 
768 	DSSDBG("dss_runtime_get\n");
769 
770 	r = pm_runtime_resume_and_get(&dss.pdev->dev);
771 	if (WARN_ON(r < 0))
772 		return r;
773 	return 0;
774 }
775 
776 void dss_runtime_put(void)
777 {
778 	int r;
779 
780 	DSSDBG("dss_runtime_put\n");
781 
782 	r = pm_runtime_put_sync(&dss.pdev->dev);
783 	WARN_ON(r < 0 && r != -ENOSYS && r != -EBUSY);
784 }
785 
786 /* DEBUGFS */
787 #if defined(CONFIG_FB_OMAP2_DSS_DEBUGFS)
788 void dss_debug_dump_clocks(struct seq_file *s)
789 {
790 	dss_dump_clocks(s);
791 	dispc_dump_clocks(s);
792 #ifdef CONFIG_FB_OMAP2_DSS_DSI
793 	dsi_dump_clocks(s);
794 #endif
795 }
796 #endif
797 
798 
799 static const enum omap_display_type omap2plus_ports[] = {
800 	OMAP_DISPLAY_TYPE_DPI,
801 };
802 
803 static const enum omap_display_type omap34xx_ports[] = {
804 	OMAP_DISPLAY_TYPE_DPI,
805 	OMAP_DISPLAY_TYPE_SDI,
806 };
807 
808 static const enum omap_display_type dra7xx_ports[] = {
809 	OMAP_DISPLAY_TYPE_DPI,
810 	OMAP_DISPLAY_TYPE_DPI,
811 	OMAP_DISPLAY_TYPE_DPI,
812 };
813 
814 static const struct dss_features omap24xx_dss_feats = {
815 	/*
816 	 * fck div max is really 16, but the divider range has gaps. The range
817 	 * from 1 to 6 has no gaps, so let's use that as a max.
818 	 */
819 	.fck_div_max		=	6,
820 	.dss_fck_multiplier	=	2,
821 	.parent_clk_name	=	"core_ck",
822 	.dpi_select_source	=	&dss_dpi_select_source_omap2_omap3,
823 	.ports			=	omap2plus_ports,
824 	.num_ports		=	ARRAY_SIZE(omap2plus_ports),
825 };
826 
827 static const struct dss_features omap34xx_dss_feats = {
828 	.fck_div_max		=	16,
829 	.dss_fck_multiplier	=	2,
830 	.parent_clk_name	=	"dpll4_ck",
831 	.dpi_select_source	=	&dss_dpi_select_source_omap2_omap3,
832 	.ports			=	omap34xx_ports,
833 	.num_ports		=	ARRAY_SIZE(omap34xx_ports),
834 };
835 
836 static const struct dss_features omap3630_dss_feats = {
837 	.fck_div_max		=	31,
838 	.dss_fck_multiplier	=	1,
839 	.parent_clk_name	=	"dpll4_ck",
840 	.dpi_select_source	=	&dss_dpi_select_source_omap2_omap3,
841 	.ports			=	omap2plus_ports,
842 	.num_ports		=	ARRAY_SIZE(omap2plus_ports),
843 };
844 
845 static const struct dss_features omap44xx_dss_feats = {
846 	.fck_div_max		=	32,
847 	.dss_fck_multiplier	=	1,
848 	.parent_clk_name	=	"dpll_per_x2_ck",
849 	.dpi_select_source	=	&dss_dpi_select_source_omap4,
850 	.ports			=	omap2plus_ports,
851 	.num_ports		=	ARRAY_SIZE(omap2plus_ports),
852 };
853 
854 static const struct dss_features omap54xx_dss_feats = {
855 	.fck_div_max		=	64,
856 	.dss_fck_multiplier	=	1,
857 	.parent_clk_name	=	"dpll_per_x2_ck",
858 	.dpi_select_source	=	&dss_dpi_select_source_omap5,
859 	.ports			=	omap2plus_ports,
860 	.num_ports		=	ARRAY_SIZE(omap2plus_ports),
861 };
862 
863 static const struct dss_features am43xx_dss_feats = {
864 	.fck_div_max		=	0,
865 	.dss_fck_multiplier	=	0,
866 	.parent_clk_name	=	NULL,
867 	.dpi_select_source	=	&dss_dpi_select_source_omap2_omap3,
868 	.ports			=	omap2plus_ports,
869 	.num_ports		=	ARRAY_SIZE(omap2plus_ports),
870 };
871 
872 static const struct dss_features dra7xx_dss_feats = {
873 	.fck_div_max		=	64,
874 	.dss_fck_multiplier	=	1,
875 	.parent_clk_name	=	"dpll_per_x2_ck",
876 	.dpi_select_source	=	&dss_dpi_select_source_dra7xx,
877 	.ports			=	dra7xx_ports,
878 	.num_ports		=	ARRAY_SIZE(dra7xx_ports),
879 };
880 
881 static const struct dss_features *dss_get_features(void)
882 {
883 	switch (omapdss_get_version()) {
884 	case OMAPDSS_VER_OMAP24xx:
885 		return &omap24xx_dss_feats;
886 
887 	case OMAPDSS_VER_OMAP34xx_ES1:
888 	case OMAPDSS_VER_OMAP34xx_ES3:
889 	case OMAPDSS_VER_AM35xx:
890 		return &omap34xx_dss_feats;
891 
892 	case OMAPDSS_VER_OMAP3630:
893 		return &omap3630_dss_feats;
894 
895 	case OMAPDSS_VER_OMAP4430_ES1:
896 	case OMAPDSS_VER_OMAP4430_ES2:
897 	case OMAPDSS_VER_OMAP4:
898 		return &omap44xx_dss_feats;
899 
900 	case OMAPDSS_VER_OMAP5:
901 		return &omap54xx_dss_feats;
902 
903 	case OMAPDSS_VER_AM43xx:
904 		return &am43xx_dss_feats;
905 
906 	case OMAPDSS_VER_DRA7xx:
907 		return &dra7xx_dss_feats;
908 
909 	default:
910 		return NULL;
911 	}
912 }
913 
914 static void dss_uninit_ports(struct platform_device *pdev);
915 
916 static int dss_init_ports(struct platform_device *pdev)
917 {
918 	struct device_node *parent = pdev->dev.of_node;
919 	struct device_node *port;
920 	int r, ret = 0;
921 
922 	if (parent == NULL)
923 		return 0;
924 
925 	port = omapdss_of_get_next_port(parent, NULL);
926 	if (!port)
927 		return 0;
928 
929 	if (dss.feat->num_ports == 0)
930 		return 0;
931 
932 	do {
933 		enum omap_display_type port_type;
934 		u32 reg;
935 
936 		r = of_property_read_u32(port, "reg", &reg);
937 		if (r)
938 			reg = 0;
939 
940 		if (reg >= dss.feat->num_ports)
941 			continue;
942 
943 		port_type = dss.feat->ports[reg];
944 
945 		switch (port_type) {
946 		case OMAP_DISPLAY_TYPE_DPI:
947 			ret = dpi_init_port(pdev, port);
948 			break;
949 		case OMAP_DISPLAY_TYPE_SDI:
950 			ret = sdi_init_port(pdev, port);
951 			break;
952 		default:
953 			break;
954 		}
955 	} while (!ret &&
956 		 (port = omapdss_of_get_next_port(parent, port)) != NULL);
957 
958 	if (ret)
959 		dss_uninit_ports(pdev);
960 
961 	return ret;
962 }
963 
964 static void dss_uninit_ports(struct platform_device *pdev)
965 {
966 	struct device_node *parent = pdev->dev.of_node;
967 	struct device_node *port;
968 
969 	if (parent == NULL)
970 		return;
971 
972 	port = omapdss_of_get_next_port(parent, NULL);
973 	if (!port)
974 		return;
975 
976 	if (dss.feat->num_ports == 0)
977 		return;
978 
979 	do {
980 		enum omap_display_type port_type;
981 		u32 reg;
982 		int r;
983 
984 		r = of_property_read_u32(port, "reg", &reg);
985 		if (r)
986 			reg = 0;
987 
988 		if (reg >= dss.feat->num_ports)
989 			continue;
990 
991 		port_type = dss.feat->ports[reg];
992 
993 		switch (port_type) {
994 		case OMAP_DISPLAY_TYPE_DPI:
995 			dpi_uninit_port(port);
996 			break;
997 		case OMAP_DISPLAY_TYPE_SDI:
998 			sdi_uninit_port(port);
999 			break;
1000 		default:
1001 			break;
1002 		}
1003 	} while ((port = omapdss_of_get_next_port(parent, port)) != NULL);
1004 }
1005 
1006 static int dss_video_pll_probe(struct platform_device *pdev)
1007 {
1008 	struct device_node *np = pdev->dev.of_node;
1009 	struct regulator *pll_regulator;
1010 	int r;
1011 
1012 	if (!np)
1013 		return 0;
1014 
1015 	if (of_property_read_bool(np, "syscon-pll-ctrl")) {
1016 		dss.syscon_pll_ctrl = syscon_regmap_lookup_by_phandle(np,
1017 			"syscon-pll-ctrl");
1018 		if (IS_ERR(dss.syscon_pll_ctrl)) {
1019 			dev_err(&pdev->dev,
1020 				"failed to get syscon-pll-ctrl regmap\n");
1021 			return PTR_ERR(dss.syscon_pll_ctrl);
1022 		}
1023 
1024 		if (of_property_read_u32_index(np, "syscon-pll-ctrl", 1,
1025 				&dss.syscon_pll_ctrl_offset)) {
1026 			dev_err(&pdev->dev,
1027 				"failed to get syscon-pll-ctrl offset\n");
1028 			return -EINVAL;
1029 		}
1030 	}
1031 
1032 	pll_regulator = devm_regulator_get(&pdev->dev, "vdda_video");
1033 	if (IS_ERR(pll_regulator)) {
1034 		r = PTR_ERR(pll_regulator);
1035 
1036 		switch (r) {
1037 		case -ENOENT:
1038 			pll_regulator = NULL;
1039 			break;
1040 
1041 		case -EPROBE_DEFER:
1042 			return -EPROBE_DEFER;
1043 
1044 		default:
1045 			DSSERR("can't get DPLL VDDA regulator\n");
1046 			return r;
1047 		}
1048 	}
1049 
1050 	if (of_property_match_string(np, "reg-names", "pll1") >= 0) {
1051 		dss.video1_pll = dss_video_pll_init(pdev, 0, pll_regulator);
1052 		if (IS_ERR(dss.video1_pll))
1053 			return PTR_ERR(dss.video1_pll);
1054 	}
1055 
1056 	if (of_property_match_string(np, "reg-names", "pll2") >= 0) {
1057 		dss.video2_pll = dss_video_pll_init(pdev, 1, pll_regulator);
1058 		if (IS_ERR(dss.video2_pll)) {
1059 			dss_video_pll_uninit(dss.video1_pll);
1060 			return PTR_ERR(dss.video2_pll);
1061 		}
1062 	}
1063 
1064 	return 0;
1065 }
1066 
1067 /* DSS HW IP initialisation */
1068 static int dss_bind(struct device *dev)
1069 {
1070 	struct platform_device *pdev = to_platform_device(dev);
1071 	struct resource *dss_mem;
1072 	u32 rev;
1073 	int r;
1074 
1075 	dss.pdev = pdev;
1076 
1077 	dss.feat = dss_get_features();
1078 	if (!dss.feat)
1079 		return -ENODEV;
1080 
1081 	dss_mem = platform_get_resource(dss.pdev, IORESOURCE_MEM, 0);
1082 	if (!dss_mem) {
1083 		DSSERR("can't get IORESOURCE_MEM DSS\n");
1084 		return -EINVAL;
1085 	}
1086 
1087 	dss.base = devm_ioremap(&pdev->dev, dss_mem->start,
1088 				resource_size(dss_mem));
1089 	if (!dss.base) {
1090 		DSSERR("can't ioremap DSS\n");
1091 		return -ENOMEM;
1092 	}
1093 
1094 	r = dss_get_clocks();
1095 	if (r)
1096 		return r;
1097 
1098 	r = dss_setup_default_clock();
1099 	if (r)
1100 		goto err_setup_clocks;
1101 
1102 	r = dss_video_pll_probe(pdev);
1103 	if (r)
1104 		goto err_pll_init;
1105 
1106 	r = dss_init_ports(pdev);
1107 	if (r)
1108 		goto err_init_ports;
1109 
1110 	pm_runtime_enable(&pdev->dev);
1111 
1112 	r = dss_runtime_get();
1113 	if (r)
1114 		goto err_runtime_get;
1115 
1116 	dss.dss_clk_rate = clk_get_rate(dss.dss_clk);
1117 
1118 	/* Select DPLL */
1119 	REG_FLD_MOD(DSS_CONTROL, 0, 0, 0);
1120 
1121 	dss_select_dispc_clk_source(OMAP_DSS_CLK_SRC_FCK);
1122 
1123 #ifdef CONFIG_FB_OMAP2_DSS_VENC
1124 	REG_FLD_MOD(DSS_CONTROL, 1, 4, 4);	/* venc dac demen */
1125 	REG_FLD_MOD(DSS_CONTROL, 1, 3, 3);	/* venc clock 4x enable */
1126 	REG_FLD_MOD(DSS_CONTROL, 0, 2, 2);	/* venc clock mode = normal */
1127 #endif
1128 	dss.dsi_clk_source[0] = OMAP_DSS_CLK_SRC_FCK;
1129 	dss.dsi_clk_source[1] = OMAP_DSS_CLK_SRC_FCK;
1130 	dss.dispc_clk_source = OMAP_DSS_CLK_SRC_FCK;
1131 	dss.lcd_clk_source[0] = OMAP_DSS_CLK_SRC_FCK;
1132 	dss.lcd_clk_source[1] = OMAP_DSS_CLK_SRC_FCK;
1133 
1134 	rev = dss_read_reg(DSS_REVISION);
1135 	printk(KERN_INFO "OMAP DSS rev %d.%d\n",
1136 			FLD_GET(rev, 7, 4), FLD_GET(rev, 3, 0));
1137 
1138 	dss_runtime_put();
1139 
1140 	r = component_bind_all(&pdev->dev, NULL);
1141 	if (r)
1142 		goto err_component;
1143 
1144 	dss_debugfs_create_file("dss", dss_dump_regs);
1145 
1146 	pm_set_vt_switch(0);
1147 
1148 	dss_initialized = true;
1149 
1150 	return 0;
1151 
1152 err_component:
1153 err_runtime_get:
1154 	pm_runtime_disable(&pdev->dev);
1155 	dss_uninit_ports(pdev);
1156 err_init_ports:
1157 	if (dss.video1_pll)
1158 		dss_video_pll_uninit(dss.video1_pll);
1159 
1160 	if (dss.video2_pll)
1161 		dss_video_pll_uninit(dss.video2_pll);
1162 err_pll_init:
1163 err_setup_clocks:
1164 	dss_put_clocks();
1165 	return r;
1166 }
1167 
1168 static void dss_unbind(struct device *dev)
1169 {
1170 	struct platform_device *pdev = to_platform_device(dev);
1171 
1172 	dss_initialized = false;
1173 
1174 	component_unbind_all(&pdev->dev, NULL);
1175 
1176 	if (dss.video1_pll)
1177 		dss_video_pll_uninit(dss.video1_pll);
1178 
1179 	if (dss.video2_pll)
1180 		dss_video_pll_uninit(dss.video2_pll);
1181 
1182 	dss_uninit_ports(pdev);
1183 
1184 	pm_runtime_disable(&pdev->dev);
1185 
1186 	dss_put_clocks();
1187 }
1188 
1189 static const struct component_master_ops dss_component_ops = {
1190 	.bind = dss_bind,
1191 	.unbind = dss_unbind,
1192 };
1193 
1194 static int dss_add_child_component(struct device *dev, void *data)
1195 {
1196 	struct component_match **match = data;
1197 
1198 	/*
1199 	 * HACK
1200 	 * We don't have a working driver for rfbi, so skip it here always.
1201 	 * Otherwise dss will never get probed successfully, as it will wait
1202 	 * for rfbi to get probed.
1203 	 */
1204 	if (strstr(dev_name(dev), "rfbi"))
1205 		return 0;
1206 
1207 	component_match_add(dev->parent, match, component_compare_dev, dev);
1208 
1209 	return 0;
1210 }
1211 
1212 static int dss_probe(struct platform_device *pdev)
1213 {
1214 	struct component_match *match = NULL;
1215 	int r;
1216 
1217 	/* add all the child devices as components */
1218 	device_for_each_child(&pdev->dev, &match, dss_add_child_component);
1219 
1220 	r = component_master_add_with_match(&pdev->dev, &dss_component_ops, match);
1221 	if (r)
1222 		return r;
1223 
1224 	return 0;
1225 }
1226 
1227 static void dss_remove(struct platform_device *pdev)
1228 {
1229 	component_master_del(&pdev->dev, &dss_component_ops);
1230 }
1231 
1232 static int dss_runtime_suspend(struct device *dev)
1233 {
1234 	dss_save_context();
1235 	dss_set_min_bus_tput(dev, 0);
1236 
1237 	pinctrl_pm_select_sleep_state(dev);
1238 
1239 	return 0;
1240 }
1241 
1242 static int dss_runtime_resume(struct device *dev)
1243 {
1244 	int r;
1245 
1246 	pinctrl_pm_select_default_state(dev);
1247 
1248 	/*
1249 	 * Set an arbitrarily high tput request to ensure OPP100.
1250 	 * What we should really do is to make a request to stay in OPP100,
1251 	 * without any tput requirements, but that is not currently possible
1252 	 * via the PM layer.
1253 	 */
1254 
1255 	r = dss_set_min_bus_tput(dev, 1000000000);
1256 	if (r)
1257 		return r;
1258 
1259 	dss_restore_context();
1260 	return 0;
1261 }
1262 
1263 static const struct dev_pm_ops dss_pm_ops = {
1264 	.runtime_suspend = dss_runtime_suspend,
1265 	.runtime_resume = dss_runtime_resume,
1266 };
1267 
1268 static const struct of_device_id dss_of_match[] = {
1269 	{ .compatible = "ti,omap2-dss", },
1270 	{ .compatible = "ti,omap3-dss", },
1271 	{ .compatible = "ti,omap4-dss", },
1272 	{ .compatible = "ti,omap5-dss", },
1273 	{ .compatible = "ti,dra7-dss", },
1274 	{},
1275 };
1276 
1277 MODULE_DEVICE_TABLE(of, dss_of_match);
1278 
1279 static struct platform_driver omap_dsshw_driver = {
1280 	.probe		= dss_probe,
1281 	.remove_new	= dss_remove,
1282 	.driver         = {
1283 		.name   = "omapdss_dss",
1284 		.pm	= &dss_pm_ops,
1285 		.of_match_table = dss_of_match,
1286 		.suppress_bind_attrs = true,
1287 	},
1288 };
1289 
1290 int __init dss_init_platform_driver(void)
1291 {
1292 	return platform_driver_register(&omap_dsshw_driver);
1293 }
1294 
1295 void dss_uninit_platform_driver(void)
1296 {
1297 	platform_driver_unregister(&omap_dsshw_driver);
1298 }
1299