1 /*
2  * (C) Copyright 2012 - 2013 CompuLab, Ltd. <www.compulab.co.il>
3  *
4  * Authors: Nikita Kiryanov <nikita@compulab.co.il>
5  *
6  * Parsing code based on linux/drivers/video/pxafb.c
7  *
8  * SPDX-License-Identifier:	GPL-2.0+
9  */
10 
11 #include <common.h>
12 #include <asm/gpio.h>
13 #include <asm/io.h>
14 #include <stdio_dev.h>
15 #include <asm/arch/dss.h>
16 #include <lcd.h>
17 #include <scf0403_lcd.h>
18 #include <asm/arch-omap3/dss.h>
19 
20 DECLARE_GLOBAL_DATA_PTR;
21 
22 enum display_type {
23 	NONE,
24 	DVI,
25 	DVI_CUSTOM,
26 	DATA_IMAGE, /* #define CONFIG_SCF0403_LCD to use */
27 };
28 
29 #define CMAP_ADDR	0x80100000
30 
31 /*
32  * The frame buffer is allocated before we have the chance to parse user input.
33  * To make sure enough memory is allocated for all resolutions, we define
34  * vl_{col | row} to the maximal resolution supported by OMAP3.
35  */
36 vidinfo_t panel_info = {
37 	.vl_col  = 1400,
38 	.vl_row  = 1050,
39 	.vl_bpix = LCD_BPP,
40 	.cmap = (ushort *)CMAP_ADDR,
41 };
42 
43 static struct panel_config panel_cfg;
44 static enum display_type lcd_def;
45 
46 /*
47  * A note on DVI presets;
48  * U-Boot can convert 8 bit BMP data to 16 bit BMP data, and OMAP DSS can
49  * convert 16 bit data into 24 bit data. Thus, GFXFORMAT_RGB16 allows us to
50  * support two BMP types with one setting.
51  */
52 static const struct panel_config preset_dvi_640X480 = {
53 	.lcd_size	= PANEL_LCD_SIZE(640, 480),
54 	.timing_h	= DSS_HBP(48) | DSS_HFP(16) | DSS_HSW(96),
55 	.timing_v	= DSS_VBP(33) | DSS_VFP(10) | DSS_VSW(2),
56 	.pol_freq	= DSS_IHS | DSS_IVS | DSS_IPC,
57 	.divisor	= 12 | (1 << 16),
58 	.data_lines	= LCD_INTERFACE_24_BIT,
59 	.panel_type	= ACTIVE_DISPLAY,
60 	.load_mode	= 2,
61 	.gfx_format	= GFXFORMAT_RGB16,
62 };
63 
64 static const struct panel_config preset_dvi_800X600 = {
65 	.lcd_size	= PANEL_LCD_SIZE(800, 600),
66 	.timing_h	= DSS_HBP(88) | DSS_HFP(40) | DSS_HSW(128),
67 	.timing_v	= DSS_VBP(23) | DSS_VFP(1) | DSS_VSW(4),
68 	.pol_freq	= DSS_IHS | DSS_IVS | DSS_IPC,
69 	.divisor	= 8 | (1 << 16),
70 	.data_lines	= LCD_INTERFACE_24_BIT,
71 	.panel_type	= ACTIVE_DISPLAY,
72 	.load_mode	= 2,
73 	.gfx_format	= GFXFORMAT_RGB16,
74 };
75 
76 static const struct panel_config preset_dvi_1024X768 = {
77 	.lcd_size	= PANEL_LCD_SIZE(1024, 768),
78 	.timing_h	= DSS_HBP(160) | DSS_HFP(24) | DSS_HSW(136),
79 	.timing_v	= DSS_VBP(29) | DSS_VFP(3) | DSS_VSW(6),
80 	.pol_freq	= DSS_IHS | DSS_IVS | DSS_IPC,
81 	.divisor	= 5 | (1 << 16),
82 	.data_lines	= LCD_INTERFACE_24_BIT,
83 	.panel_type	= ACTIVE_DISPLAY,
84 	.load_mode	= 2,
85 	.gfx_format	= GFXFORMAT_RGB16,
86 };
87 
88 static const struct panel_config preset_dvi_1152X864 = {
89 	.lcd_size	= PANEL_LCD_SIZE(1152, 864),
90 	.timing_h	= DSS_HBP(256) | DSS_HFP(64) | DSS_HSW(128),
91 	.timing_v	= DSS_VBP(32) | DSS_VFP(1) | DSS_VSW(3),
92 	.pol_freq	= DSS_IHS | DSS_IVS | DSS_IPC,
93 	.divisor	= 4 | (1 << 16),
94 	.data_lines	= LCD_INTERFACE_24_BIT,
95 	.panel_type	= ACTIVE_DISPLAY,
96 	.load_mode	= 2,
97 	.gfx_format	= GFXFORMAT_RGB16,
98 };
99 
100 static const struct panel_config preset_dvi_1280X960 = {
101 	.lcd_size	= PANEL_LCD_SIZE(1280, 960),
102 	.timing_h	= DSS_HBP(312) | DSS_HFP(96) | DSS_HSW(112),
103 	.timing_v	= DSS_VBP(36) | DSS_VFP(1) | DSS_VSW(3),
104 	.pol_freq	= DSS_IHS | DSS_IVS | DSS_IPC,
105 	.divisor	= 3 | (1 << 16),
106 	.data_lines	= LCD_INTERFACE_24_BIT,
107 	.panel_type	= ACTIVE_DISPLAY,
108 	.load_mode	= 2,
109 	.gfx_format	= GFXFORMAT_RGB16,
110 };
111 
112 static const struct panel_config preset_dvi_1280X1024 = {
113 	.lcd_size	= PANEL_LCD_SIZE(1280, 1024),
114 	.timing_h	= DSS_HBP(248) | DSS_HFP(48) | DSS_HSW(112),
115 	.timing_v	= DSS_VBP(38) | DSS_VFP(1) | DSS_VSW(3),
116 	.pol_freq	= DSS_IHS | DSS_IVS | DSS_IPC,
117 	.divisor	= 3 | (1 << 16),
118 	.data_lines	= LCD_INTERFACE_24_BIT,
119 	.panel_type	= ACTIVE_DISPLAY,
120 	.load_mode	= 2,
121 	.gfx_format	= GFXFORMAT_RGB16,
122 };
123 
124 static const struct panel_config preset_dataimage_480X800 = {
125 	.lcd_size	= PANEL_LCD_SIZE(480, 800),
126 	.timing_h	= DSS_HBP(2) | DSS_HFP(2) | DSS_HSW(2),
127 	.timing_v	= DSS_VBP(17) | DSS_VFP(20) | DSS_VSW(3),
128 	.pol_freq	= DSS_IVS | DSS_IHS | DSS_IPC | DSS_ONOFF,
129 	.divisor	= 10 | (1 << 10),
130 	.data_lines	= LCD_INTERFACE_18_BIT,
131 	.panel_type	= ACTIVE_DISPLAY,
132 	.load_mode	= 2,
133 	.gfx_format	= GFXFORMAT_RGB16,
134 };
135 
136 /*
137  * set_resolution_params()
138  *
139  * Due to usage of multiple display related APIs resolution data is located in
140  * more than one place. This function updates them all.
141  */
142 static void set_resolution_params(int x, int y)
143 {
144 	panel_cfg.lcd_size = PANEL_LCD_SIZE(x, y);
145 	panel_info.vl_col = x;
146 	panel_info.vl_row = y;
147 	lcd_line_length = (panel_info.vl_col * NBITS(panel_info.vl_bpix)) / 8;
148 }
149 
150 static void set_preset(const struct panel_config preset, int x_res, int y_res)
151 {
152 	panel_cfg = preset;
153 	set_resolution_params(x_res, y_res);
154 }
155 
156 static enum display_type set_dvi_preset(const struct panel_config preset,
157 					int x_res, int y_res)
158 {
159 	set_preset(preset, x_res, y_res);
160 	return DVI;
161 }
162 
163 static enum display_type set_dataimage_preset(const struct panel_config preset,
164 		int x_res, int y_res)
165 {
166 	set_preset(preset, x_res, y_res);
167 	return DATA_IMAGE;
168 }
169 
170 /*
171  * parse_mode() - parse the mode parameter of custom lcd settings
172  *
173  * @mode:	<res_x>x<res_y>
174  *
175  * Returns -1 on error, 0 on success.
176  */
177 static int parse_mode(const char *mode)
178 {
179 	unsigned int modelen = strlen(mode);
180 	int res_specified = 0;
181 	unsigned int xres = 0, yres = 0;
182 	int yres_specified = 0;
183 	int i;
184 
185 	for (i = modelen - 1; i >= 0; i--) {
186 		switch (mode[i]) {
187 		case 'x':
188 			if (!yres_specified) {
189 				yres = simple_strtoul(&mode[i + 1], NULL, 0);
190 				yres_specified = 1;
191 			} else {
192 				goto done_parsing;
193 			}
194 
195 			break;
196 		case '0' ... '9':
197 			break;
198 		default:
199 			goto done_parsing;
200 		}
201 	}
202 
203 	if (i < 0 && yres_specified) {
204 		xres = simple_strtoul(mode, NULL, 0);
205 		res_specified = 1;
206 	}
207 
208 done_parsing:
209 	if (res_specified) {
210 		set_resolution_params(xres, yres);
211 	} else {
212 		printf("LCD: invalid mode: %s\n", mode);
213 		return -1;
214 	}
215 
216 	return 0;
217 }
218 
219 #define PIXEL_CLK_NUMERATOR (26 * 432 / 39)
220 /*
221  * parse_pixclock() - Parse the pixclock parameter of custom lcd settings
222  *
223  * @pixclock:	the desired pixel clock
224  *
225  * Returns -1 on error, 0 on success.
226  *
227  * Handling the pixel_clock:
228  *
229  * Pixel clock is defined in the OMAP35x TRM as follows:
230  * pixel_clock =
231  * (SYS_CLK * 2 * PRCM.CM_CLKSEL2_PLL[18:8]) /
232  * (DSS.DISPC_DIVISOR[23:16] * DSS.DISPC_DIVISOR[6:0] *
233  * PRCM.CM_CLKSEL_DSS[4:0] * (PRCM.CM_CLKSEL2_PLL[6:0] + 1))
234  *
235  * In practice, this means that in order to set the
236  * divisor for the desired pixel clock one needs to
237  * solve the following equation:
238  *
239  * 26 * 432 / (39 * <pixel_clock>) = DSS.DISPC_DIVISOR[6:0]
240  *
241  * NOTE: the explicit equation above is reduced. Do not
242  * try to infer anything from these numbers.
243  */
244 static int parse_pixclock(char *pixclock)
245 {
246 	int divisor, pixclock_val;
247 	char *pixclk_start = pixclock;
248 
249 	pixclock_val = simple_strtoul(pixclock, &pixclock, 10);
250 	divisor = DIV_ROUND_UP(PIXEL_CLK_NUMERATOR, pixclock_val);
251 	/* 0 and 1 are illegal values for PCD */
252 	if (divisor <= 1)
253 		divisor = 2;
254 
255 	panel_cfg.divisor = divisor | (1 << 16);
256 	if (pixclock[0] != '\0') {
257 		printf("LCD: invalid value for pixclock:%s\n", pixclk_start);
258 		return -1;
259 	}
260 
261 	return 0;
262 }
263 
264 /*
265  * parse_setting() - parse a single setting of custom lcd parameters
266  *
267  * @setting:	The custom lcd setting <name>:<value>
268  *
269  * Returns -1 on failure, 0 on success.
270  */
271 static int parse_setting(char *setting)
272 {
273 	int num_val;
274 	char *setting_start = setting;
275 
276 	if (!strncmp(setting, "mode:", 5)) {
277 		return parse_mode(setting + 5);
278 	} else if (!strncmp(setting, "pixclock:", 9)) {
279 		return parse_pixclock(setting + 9);
280 	} else if (!strncmp(setting, "left:", 5)) {
281 		num_val = simple_strtoul(setting + 5, &setting, 0);
282 		panel_cfg.timing_h |= DSS_HBP(num_val);
283 	} else if (!strncmp(setting, "right:", 6)) {
284 		num_val = simple_strtoul(setting + 6, &setting, 0);
285 		panel_cfg.timing_h |= DSS_HFP(num_val);
286 	} else if (!strncmp(setting, "upper:", 6)) {
287 		num_val = simple_strtoul(setting + 6, &setting, 0);
288 		panel_cfg.timing_v |= DSS_VBP(num_val);
289 	} else if (!strncmp(setting, "lower:", 6)) {
290 		num_val = simple_strtoul(setting + 6, &setting, 0);
291 		panel_cfg.timing_v |= DSS_VFP(num_val);
292 	} else if (!strncmp(setting, "hsynclen:", 9)) {
293 		num_val = simple_strtoul(setting + 9, &setting, 0);
294 		panel_cfg.timing_h |= DSS_HSW(num_val);
295 	} else if (!strncmp(setting, "vsynclen:", 9)) {
296 		num_val = simple_strtoul(setting + 9, &setting, 0);
297 		panel_cfg.timing_v |= DSS_VSW(num_val);
298 	} else if (!strncmp(setting, "hsync:", 6)) {
299 		if (simple_strtoul(setting + 6, &setting, 0) == 0)
300 			panel_cfg.pol_freq |= DSS_IHS;
301 		else
302 			panel_cfg.pol_freq &= ~DSS_IHS;
303 	} else if (!strncmp(setting, "vsync:", 6)) {
304 		if (simple_strtoul(setting + 6, &setting, 0) == 0)
305 			panel_cfg.pol_freq |= DSS_IVS;
306 		else
307 			panel_cfg.pol_freq &= ~DSS_IVS;
308 	} else if (!strncmp(setting, "outputen:", 9)) {
309 		if (simple_strtoul(setting + 9, &setting, 0) == 0)
310 			panel_cfg.pol_freq |= DSS_IEO;
311 		else
312 			panel_cfg.pol_freq &= ~DSS_IEO;
313 	} else if (!strncmp(setting, "pixclockpol:", 12)) {
314 		if (simple_strtoul(setting + 12, &setting, 0) == 0)
315 			panel_cfg.pol_freq |= DSS_IPC;
316 		else
317 			panel_cfg.pol_freq &= ~DSS_IPC;
318 	} else if (!strncmp(setting, "active", 6)) {
319 		panel_cfg.panel_type = ACTIVE_DISPLAY;
320 		return 0; /* Avoid sanity check below */
321 	} else if (!strncmp(setting, "passive", 7)) {
322 		panel_cfg.panel_type = PASSIVE_DISPLAY;
323 		return 0; /* Avoid sanity check below */
324 	} else if (!strncmp(setting, "display:", 8)) {
325 		if (!strncmp(setting + 8, "dvi", 3)) {
326 			lcd_def = DVI_CUSTOM;
327 			return 0; /* Avoid sanity check below */
328 		}
329 	} else {
330 		printf("LCD: unknown option %s\n", setting_start);
331 		return -1;
332 	}
333 
334 	if (setting[0] != '\0') {
335 		printf("LCD: invalid value for %s\n", setting_start);
336 		return -1;
337 	}
338 
339 	return 0;
340 }
341 
342 /*
343  * env_parse_customlcd() - parse custom lcd params from an environment variable.
344  *
345  * @custom_lcd_params:	The environment variable containing the lcd params.
346  *
347  * Returns -1 on failure, 0 on success.
348  */
349 static int parse_customlcd(char *custom_lcd_params)
350 {
351 	char params_cpy[160];
352 	char *setting;
353 
354 	strncpy(params_cpy, custom_lcd_params, 160);
355 	setting = strtok(params_cpy, ",");
356 	while (setting) {
357 		if (parse_setting(setting) < 0)
358 			return -1;
359 
360 		setting = strtok(NULL, ",");
361 	}
362 
363 	/* Currently we don't support changing this via custom lcd params */
364 	panel_cfg.data_lines = LCD_INTERFACE_24_BIT;
365 	panel_cfg.gfx_format = GFXFORMAT_RGB16; /* See dvi predefines note */
366 
367 	return 0;
368 }
369 
370 /*
371  * env_parse_displaytype() - parse display type.
372  *
373  * Parses the environment variable "displaytype", which contains the
374  * name of the display type or preset, in which case it applies its
375  * configurations.
376  *
377  * Returns the type of display that was specified.
378  */
379 static enum display_type env_parse_displaytype(char *displaytype)
380 {
381 	if (!strncmp(displaytype, "dvi640x480", 10))
382 		return set_dvi_preset(preset_dvi_640X480, 640, 480);
383 	else if (!strncmp(displaytype, "dvi800x600", 10))
384 		return set_dvi_preset(preset_dvi_800X600, 800, 600);
385 	else if (!strncmp(displaytype, "dvi1024x768", 11))
386 		return set_dvi_preset(preset_dvi_1024X768, 1024, 768);
387 	else if (!strncmp(displaytype, "dvi1152x864", 11))
388 		return set_dvi_preset(preset_dvi_1152X864, 1152, 864);
389 	else if (!strncmp(displaytype, "dvi1280x960", 11))
390 		return set_dvi_preset(preset_dvi_1280X960, 1280, 960);
391 	else if (!strncmp(displaytype, "dvi1280x1024", 12))
392 		return set_dvi_preset(preset_dvi_1280X1024, 1280, 1024);
393 	else if (!strncmp(displaytype, "dataimage480x800", 16))
394 		return set_dataimage_preset(preset_dataimage_480X800, 480, 800);
395 
396 	return NONE;
397 }
398 
399 void lcd_ctrl_init(void *lcdbase)
400 {
401 	struct prcm *prcm = (struct prcm *)PRCM_BASE;
402 	char *custom_lcd;
403 	char *displaytype = env_get("displaytype");
404 
405 	if (displaytype == NULL)
406 		return;
407 
408 	lcd_def = env_parse_displaytype(displaytype);
409 	/* If we did not recognize the preset, check if it's an env variable */
410 	if (lcd_def == NONE) {
411 		custom_lcd = env_get(displaytype);
412 		if (custom_lcd == NULL || parse_customlcd(custom_lcd) < 0)
413 			return;
414 	}
415 
416 	panel_cfg.frame_buffer = lcdbase;
417 	omap3_dss_panel_config(&panel_cfg);
418 	/*
419 	 * Pixel clock is defined with many divisions and only few
420 	 * multiplications of the system clock. Since DSS FCLK divisor is set
421 	 * to 16 by default, we need to set it to a smaller value, like 3
422 	 * (chosen via trial and error).
423 	 */
424 	clrsetbits_le32(&prcm->clksel_dss, 0xF, 3);
425 }
426 
427 #ifdef CONFIG_SCF0403_LCD
428 static void scf0403_enable(void)
429 {
430 	gpio_direction_output(58, 1);
431 	scf0403_init(157);
432 }
433 #else
434 static inline void scf0403_enable(void) {}
435 #endif
436 
437 void lcd_enable(void)
438 {
439 	switch (lcd_def) {
440 	case NONE:
441 		return;
442 	case DVI:
443 	case DVI_CUSTOM:
444 		gpio_direction_output(54, 0); /* Turn on DVI */
445 		break;
446 	case DATA_IMAGE:
447 		scf0403_enable();
448 		break;
449 	}
450 
451 	omap3_dss_enable();
452 }
453 
454 void lcd_setcolreg(ushort regno, ushort red, ushort green, ushort blue) {}
455