1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3  * OMAP2plus display device setup / initialization.
4  *
5  * Copyright (C) 2010 Texas Instruments Incorporated - https://www.ti.com/
6  *	Senthilvadivu Guruswamy
7  *	Sumit Semwal
8  */
9 
10 #include <linux/string.h>
11 #include <linux/kernel.h>
12 #include <linux/init.h>
13 #include <linux/platform_device.h>
14 #include <linux/io.h>
15 #include <linux/clk.h>
16 #include <linux/err.h>
17 #include <linux/delay.h>
18 #include <linux/of.h>
19 #include <linux/of_platform.h>
20 #include <linux/slab.h>
21 #include <linux/mfd/syscon.h>
22 #include <linux/regmap.h>
23 
24 #include <linux/platform_data/omapdss.h>
25 #include "omap_hwmod.h"
26 #include "omap_device.h"
27 #include "common.h"
28 
29 #include "soc.h"
30 #include "iomap.h"
31 #include "control.h"
32 #include "display.h"
33 #include "prm.h"
34 
35 #define DISPC_CONTROL		0x0040
36 #define DISPC_CONTROL2		0x0238
37 #define DISPC_CONTROL3		0x0848
38 #define DISPC_IRQSTATUS		0x0018
39 
40 #define DSS_CONTROL		0x40
41 #define DSS_SDI_CONTROL		0x44
42 #define DSS_PLL_CONTROL		0x48
43 
44 #define LCD_EN_MASK		(0x1 << 0)
45 #define DIGIT_EN_MASK		(0x1 << 1)
46 
47 #define FRAMEDONE_IRQ_SHIFT	0
48 #define EVSYNC_EVEN_IRQ_SHIFT	2
49 #define EVSYNC_ODD_IRQ_SHIFT	3
50 #define FRAMEDONE2_IRQ_SHIFT	22
51 #define FRAMEDONE3_IRQ_SHIFT	30
52 #define FRAMEDONETV_IRQ_SHIFT	24
53 
54 /*
55  * FRAMEDONE_IRQ_TIMEOUT: how long (in milliseconds) to wait during DISPC
56  *     reset before deciding that something has gone wrong
57  */
58 #define FRAMEDONE_IRQ_TIMEOUT		100
59 
60 #if defined(CONFIG_FB_OMAP2)
61 static struct platform_device omap_display_device = {
62 	.name          = "omapdss",
63 	.id            = -1,
64 	.dev            = {
65 		.platform_data = NULL,
66 	},
67 };
68 
69 #define OMAP4_DSIPHY_SYSCON_OFFSET		0x78
70 
71 static struct regmap *omap4_dsi_mux_syscon;
72 
omap4_dsi_mux_pads(int dsi_id,unsigned lanes)73 static int omap4_dsi_mux_pads(int dsi_id, unsigned lanes)
74 {
75 	u32 enable_mask, enable_shift;
76 	u32 pipd_mask, pipd_shift;
77 	u32 reg;
78 	int ret;
79 
80 	if (dsi_id == 0) {
81 		enable_mask = OMAP4_DSI1_LANEENABLE_MASK;
82 		enable_shift = OMAP4_DSI1_LANEENABLE_SHIFT;
83 		pipd_mask = OMAP4_DSI1_PIPD_MASK;
84 		pipd_shift = OMAP4_DSI1_PIPD_SHIFT;
85 	} else if (dsi_id == 1) {
86 		enable_mask = OMAP4_DSI2_LANEENABLE_MASK;
87 		enable_shift = OMAP4_DSI2_LANEENABLE_SHIFT;
88 		pipd_mask = OMAP4_DSI2_PIPD_MASK;
89 		pipd_shift = OMAP4_DSI2_PIPD_SHIFT;
90 	} else {
91 		return -ENODEV;
92 	}
93 
94 	ret = regmap_read(omap4_dsi_mux_syscon,
95 					  OMAP4_DSIPHY_SYSCON_OFFSET,
96 					  &reg);
97 	if (ret)
98 		return ret;
99 
100 	reg &= ~enable_mask;
101 	reg &= ~pipd_mask;
102 
103 	reg |= (lanes << enable_shift) & enable_mask;
104 	reg |= (lanes << pipd_shift) & pipd_mask;
105 
106 	regmap_write(omap4_dsi_mux_syscon, OMAP4_DSIPHY_SYSCON_OFFSET, reg);
107 
108 	return 0;
109 }
110 
omap_dsi_enable_pads(int dsi_id,unsigned lane_mask)111 static int omap_dsi_enable_pads(int dsi_id, unsigned lane_mask)
112 {
113 	if (cpu_is_omap44xx())
114 		return omap4_dsi_mux_pads(dsi_id, lane_mask);
115 
116 	return 0;
117 }
118 
omap_dsi_disable_pads(int dsi_id,unsigned lane_mask)119 static void omap_dsi_disable_pads(int dsi_id, unsigned lane_mask)
120 {
121 	if (cpu_is_omap44xx())
122 		omap4_dsi_mux_pads(dsi_id, 0);
123 }
124 
omap_display_get_version(void)125 static enum omapdss_version __init omap_display_get_version(void)
126 {
127 	if (cpu_is_omap24xx())
128 		return OMAPDSS_VER_OMAP24xx;
129 	else if (cpu_is_omap3630())
130 		return OMAPDSS_VER_OMAP3630;
131 	else if (cpu_is_omap34xx()) {
132 		if (soc_is_am35xx()) {
133 			return OMAPDSS_VER_AM35xx;
134 		} else {
135 			if (omap_rev() < OMAP3430_REV_ES3_0)
136 				return OMAPDSS_VER_OMAP34xx_ES1;
137 			else
138 				return OMAPDSS_VER_OMAP34xx_ES3;
139 		}
140 	} else if (omap_rev() == OMAP4430_REV_ES1_0)
141 		return OMAPDSS_VER_OMAP4430_ES1;
142 	else if (omap_rev() == OMAP4430_REV_ES2_0 ||
143 			omap_rev() == OMAP4430_REV_ES2_1 ||
144 			omap_rev() == OMAP4430_REV_ES2_2)
145 		return OMAPDSS_VER_OMAP4430_ES2;
146 	else if (cpu_is_omap44xx())
147 		return OMAPDSS_VER_OMAP4;
148 	else if (soc_is_omap54xx())
149 		return OMAPDSS_VER_OMAP5;
150 	else if (soc_is_am43xx())
151 		return OMAPDSS_VER_AM43xx;
152 	else if (soc_is_dra7xx())
153 		return OMAPDSS_VER_DRA7xx;
154 	else
155 		return OMAPDSS_VER_UNKNOWN;
156 }
157 
omapdss_init_fbdev(void)158 static int __init omapdss_init_fbdev(void)
159 {
160 	static struct omap_dss_board_info board_data = {
161 		.dsi_enable_pads = omap_dsi_enable_pads,
162 		.dsi_disable_pads = omap_dsi_disable_pads,
163 	};
164 	struct device_node *node;
165 	int r;
166 
167 	board_data.version = omap_display_get_version();
168 	if (board_data.version == OMAPDSS_VER_UNKNOWN) {
169 		pr_err("DSS not supported on this SoC\n");
170 		return -ENODEV;
171 	}
172 
173 	omap_display_device.dev.platform_data = &board_data;
174 
175 	r = platform_device_register(&omap_display_device);
176 	if (r < 0) {
177 		pr_err("Unable to register omapdss device\n");
178 		return r;
179 	}
180 
181 	/* create vrfb device */
182 	r = omap_init_vrfb();
183 	if (r < 0) {
184 		pr_err("Unable to register omapvrfb device\n");
185 		return r;
186 	}
187 
188 	/* create FB device */
189 	r = omap_init_fb();
190 	if (r < 0) {
191 		pr_err("Unable to register omapfb device\n");
192 		return r;
193 	}
194 
195 	/* create V4L2 display device */
196 	r = omap_init_vout();
197 	if (r < 0) {
198 		pr_err("Unable to register omap_vout device\n");
199 		return r;
200 	}
201 
202 	/* add DSI info for omap4 */
203 	node = of_find_node_by_name(NULL, "omap4_padconf_global");
204 	if (node)
205 		omap4_dsi_mux_syscon = syscon_node_to_regmap(node);
206 	of_node_put(node);
207 
208 	return 0;
209 }
210 
211 static const char * const omapdss_compat_names[] __initconst = {
212 	"ti,omap2-dss",
213 	"ti,omap3-dss",
214 	"ti,omap4-dss",
215 	"ti,omap5-dss",
216 	"ti,dra7-dss",
217 };
218 
omapdss_find_dss_of_node(void)219 static struct device_node * __init omapdss_find_dss_of_node(void)
220 {
221 	struct device_node *node;
222 	int i;
223 
224 	for (i = 0; i < ARRAY_SIZE(omapdss_compat_names); ++i) {
225 		node = of_find_compatible_node(NULL, NULL,
226 			omapdss_compat_names[i]);
227 		if (node)
228 			return node;
229 	}
230 
231 	return NULL;
232 }
233 
omapdss_init_of(void)234 static int __init omapdss_init_of(void)
235 {
236 	int r;
237 	struct device_node *node;
238 	struct platform_device *pdev;
239 
240 	/* only create dss helper devices if dss is enabled in the .dts */
241 
242 	node = omapdss_find_dss_of_node();
243 	if (!node)
244 		return 0;
245 
246 	if (!of_device_is_available(node)) {
247 		of_node_put(node);
248 		return 0;
249 	}
250 
251 	pdev = of_find_device_by_node(node);
252 
253 	if (!pdev) {
254 		pr_err("Unable to find DSS platform device\n");
255 		of_node_put(node);
256 		return -ENODEV;
257 	}
258 
259 	r = of_platform_populate(node, NULL, NULL, &pdev->dev);
260 	put_device(&pdev->dev);
261 	of_node_put(node);
262 	if (r) {
263 		pr_err("Unable to populate DSS submodule devices\n");
264 		return r;
265 	}
266 
267 	return omapdss_init_fbdev();
268 }
269 omap_device_initcall(omapdss_init_of);
270 #endif /* CONFIG_FB_OMAP2 */
271 
dispc_disable_outputs(void)272 static void dispc_disable_outputs(void)
273 {
274 	u32 v, irq_mask = 0;
275 	bool lcd_en, digit_en, lcd2_en = false, lcd3_en = false;
276 	int i;
277 	struct omap_dss_dispc_dev_attr *da;
278 	struct omap_hwmod *oh;
279 
280 	oh = omap_hwmod_lookup("dss_dispc");
281 	if (!oh) {
282 		WARN(1, "display: could not disable outputs during reset - could not find dss_dispc hwmod\n");
283 		return;
284 	}
285 
286 	if (!oh->dev_attr) {
287 		pr_err("display: could not disable outputs during reset due to missing dev_attr\n");
288 		return;
289 	}
290 
291 	da = (struct omap_dss_dispc_dev_attr *)oh->dev_attr;
292 
293 	/* store value of LCDENABLE and DIGITENABLE bits */
294 	v = omap_hwmod_read(oh, DISPC_CONTROL);
295 	lcd_en = v & LCD_EN_MASK;
296 	digit_en = v & DIGIT_EN_MASK;
297 
298 	/* store value of LCDENABLE for LCD2 */
299 	if (da->manager_count > 2) {
300 		v = omap_hwmod_read(oh, DISPC_CONTROL2);
301 		lcd2_en = v & LCD_EN_MASK;
302 	}
303 
304 	/* store value of LCDENABLE for LCD3 */
305 	if (da->manager_count > 3) {
306 		v = omap_hwmod_read(oh, DISPC_CONTROL3);
307 		lcd3_en = v & LCD_EN_MASK;
308 	}
309 
310 	if (!(lcd_en | digit_en | lcd2_en | lcd3_en))
311 		return; /* no managers currently enabled */
312 
313 	/*
314 	 * If any manager was enabled, we need to disable it before
315 	 * DSS clocks are disabled or DISPC module is reset
316 	 */
317 	if (lcd_en)
318 		irq_mask |= 1 << FRAMEDONE_IRQ_SHIFT;
319 
320 	if (digit_en) {
321 		if (da->has_framedonetv_irq) {
322 			irq_mask |= 1 << FRAMEDONETV_IRQ_SHIFT;
323 		} else {
324 			irq_mask |= 1 << EVSYNC_EVEN_IRQ_SHIFT |
325 				1 << EVSYNC_ODD_IRQ_SHIFT;
326 		}
327 	}
328 
329 	if (lcd2_en)
330 		irq_mask |= 1 << FRAMEDONE2_IRQ_SHIFT;
331 	if (lcd3_en)
332 		irq_mask |= 1 << FRAMEDONE3_IRQ_SHIFT;
333 
334 	/*
335 	 * clear any previous FRAMEDONE, FRAMEDONETV,
336 	 * EVSYNC_EVEN/ODD, FRAMEDONE2 or FRAMEDONE3 interrupts
337 	 */
338 	omap_hwmod_write(irq_mask, oh, DISPC_IRQSTATUS);
339 
340 	/* disable LCD and TV managers */
341 	v = omap_hwmod_read(oh, DISPC_CONTROL);
342 	v &= ~(LCD_EN_MASK | DIGIT_EN_MASK);
343 	omap_hwmod_write(v, oh, DISPC_CONTROL);
344 
345 	/* disable LCD2 manager */
346 	if (da->manager_count > 2) {
347 		v = omap_hwmod_read(oh, DISPC_CONTROL2);
348 		v &= ~LCD_EN_MASK;
349 		omap_hwmod_write(v, oh, DISPC_CONTROL2);
350 	}
351 
352 	/* disable LCD3 manager */
353 	if (da->manager_count > 3) {
354 		v = omap_hwmod_read(oh, DISPC_CONTROL3);
355 		v &= ~LCD_EN_MASK;
356 		omap_hwmod_write(v, oh, DISPC_CONTROL3);
357 	}
358 
359 	i = 0;
360 	while ((omap_hwmod_read(oh, DISPC_IRQSTATUS) & irq_mask) !=
361 	       irq_mask) {
362 		i++;
363 		if (i > FRAMEDONE_IRQ_TIMEOUT) {
364 			pr_err("didn't get FRAMEDONE1/2/3 or TV interrupt\n");
365 			break;
366 		}
367 		mdelay(1);
368 	}
369 }
370 
omap_dss_reset(struct omap_hwmod * oh)371 int omap_dss_reset(struct omap_hwmod *oh)
372 {
373 	struct omap_hwmod_opt_clk *oc;
374 	int c = 0;
375 	int i, r;
376 
377 	if (!(oh->class->sysc->sysc_flags & SYSS_HAS_RESET_STATUS)) {
378 		pr_err("dss_core: hwmod data doesn't contain reset data\n");
379 		return -EINVAL;
380 	}
381 
382 	for (i = oh->opt_clks_cnt, oc = oh->opt_clks; i > 0; i--, oc++)
383 		clk_prepare_enable(oc->_clk);
384 
385 	dispc_disable_outputs();
386 
387 	/* clear SDI registers */
388 	if (cpu_is_omap3430()) {
389 		omap_hwmod_write(0x0, oh, DSS_SDI_CONTROL);
390 		omap_hwmod_write(0x0, oh, DSS_PLL_CONTROL);
391 	}
392 
393 	/*
394 	 * clear DSS_CONTROL register to switch DSS clock sources to
395 	 * PRCM clock, if any
396 	 */
397 	omap_hwmod_write(0x0, oh, DSS_CONTROL);
398 
399 	omap_test_timeout((omap_hwmod_read(oh, oh->class->sysc->syss_offs)
400 				& SYSS_RESETDONE_MASK),
401 			MAX_MODULE_SOFTRESET_WAIT, c);
402 
403 	if (c == MAX_MODULE_SOFTRESET_WAIT)
404 		pr_warn("dss_core: waiting for reset to finish failed\n");
405 	else
406 		pr_debug("dss_core: softreset done\n");
407 
408 	for (i = oh->opt_clks_cnt, oc = oh->opt_clks; i > 0; i--, oc++)
409 		clk_disable_unprepare(oc->_clk);
410 
411 	r = (c == MAX_MODULE_SOFTRESET_WAIT) ? -ETIMEDOUT : 0;
412 
413 	return r;
414 }
415