xref: /openbmc/u-boot/drivers/video/sunxi/lcdc.c (revision 1d6edcbf)
1 // SPDX-License-Identifier: GPL-2.0+
2 /*
3  * Timing controller driver for Allwinner SoCs.
4  *
5  * (C) Copyright 2013-2014 Luc Verhaegen <libv@skynet.be>
6  * (C) Copyright 2014-2015 Hans de Goede <hdegoede@redhat.com>
7  * (C) Copyright 2017 Jernej Skrabec <jernej.skrabec@siol.net>
8  */
9 
10 #include <common.h>
11 
12 #include <asm/arch/clock.h>
13 #include <asm/arch/lcdc.h>
14 #include <asm/io.h>
15 
lcdc_get_clk_delay(const struct display_timing * mode,int tcon)16 static int lcdc_get_clk_delay(const struct display_timing *mode, int tcon)
17 {
18 	int delay;
19 
20 	delay = mode->vfront_porch.typ + mode->vsync_len.typ +
21 		mode->vback_porch.typ;
22 	if (mode->flags & DISPLAY_FLAGS_INTERLACED)
23 		delay /= 2;
24 	if (tcon == 1)
25 		delay -= 2;
26 
27 	return (delay > 30) ? 30 : delay;
28 }
29 
lcdc_init(struct sunxi_lcdc_reg * const lcdc)30 void lcdc_init(struct sunxi_lcdc_reg * const lcdc)
31 {
32 	/* Init lcdc */
33 	writel(0, &lcdc->ctrl); /* Disable tcon */
34 	writel(0, &lcdc->int0); /* Disable all interrupts */
35 
36 	/* Disable tcon0 dot clock */
37 	clrbits_le32(&lcdc->tcon0_dclk, SUNXI_LCDC_TCON0_DCLK_ENABLE);
38 
39 	/* Set all io lines to tristate */
40 	writel(0xffffffff, &lcdc->tcon0_io_tristate);
41 	writel(0xffffffff, &lcdc->tcon1_io_tristate);
42 }
43 
lcdc_enable(struct sunxi_lcdc_reg * const lcdc,int depth)44 void lcdc_enable(struct sunxi_lcdc_reg * const lcdc, int depth)
45 {
46 	setbits_le32(&lcdc->ctrl, SUNXI_LCDC_CTRL_TCON_ENABLE);
47 #ifdef CONFIG_VIDEO_LCD_IF_LVDS
48 	setbits_le32(&lcdc->tcon0_lvds_intf, SUNXI_LCDC_TCON0_LVDS_INTF_ENABLE);
49 	setbits_le32(&lcdc->lvds_ana0, SUNXI_LCDC_LVDS_ANA0);
50 #ifdef CONFIG_SUNXI_GEN_SUN6I
51 	udelay(2); /* delay at least 1200 ns */
52 	setbits_le32(&lcdc->lvds_ana0, SUNXI_LCDC_LVDS_ANA0_EN_MB);
53 	udelay(2); /* delay at least 1200 ns */
54 	setbits_le32(&lcdc->lvds_ana0, SUNXI_LCDC_LVDS_ANA0_DRVC);
55 	if (depth == 18)
56 		setbits_le32(&lcdc->lvds_ana0, SUNXI_LCDC_LVDS_ANA0_DRVD(0x7));
57 	else
58 		setbits_le32(&lcdc->lvds_ana0, SUNXI_LCDC_LVDS_ANA0_DRVD(0xf));
59 #else
60 	setbits_le32(&lcdc->lvds_ana0, SUNXI_LCDC_LVDS_ANA0_UPDATE);
61 	udelay(2); /* delay at least 1200 ns */
62 	setbits_le32(&lcdc->lvds_ana1, SUNXI_LCDC_LVDS_ANA1_INIT1);
63 	udelay(1); /* delay at least 120 ns */
64 	setbits_le32(&lcdc->lvds_ana1, SUNXI_LCDC_LVDS_ANA1_INIT2);
65 	setbits_le32(&lcdc->lvds_ana0, SUNXI_LCDC_LVDS_ANA0_UPDATE);
66 #endif
67 #endif
68 }
69 
lcdc_tcon0_mode_set(struct sunxi_lcdc_reg * const lcdc,const struct display_timing * mode,int clk_div,bool for_ext_vga_dac,int depth,int dclk_phase)70 void lcdc_tcon0_mode_set(struct sunxi_lcdc_reg * const lcdc,
71 			 const struct display_timing *mode,
72 			 int clk_div, bool for_ext_vga_dac,
73 			 int depth, int dclk_phase)
74 {
75 	int bp, clk_delay, total, val;
76 
77 #ifndef CONFIG_SUNXI_DE2
78 	/* Use tcon0 */
79 	clrsetbits_le32(&lcdc->ctrl, SUNXI_LCDC_CTRL_IO_MAP_MASK,
80 			SUNXI_LCDC_CTRL_IO_MAP_TCON0);
81 #endif
82 
83 	clk_delay = lcdc_get_clk_delay(mode, 0);
84 	writel(SUNXI_LCDC_TCON0_CTRL_ENABLE |
85 	       SUNXI_LCDC_TCON0_CTRL_CLK_DELAY(clk_delay), &lcdc->tcon0_ctrl);
86 
87 	writel(SUNXI_LCDC_TCON0_DCLK_ENABLE |
88 	       SUNXI_LCDC_TCON0_DCLK_DIV(clk_div), &lcdc->tcon0_dclk);
89 
90 	writel(SUNXI_LCDC_X(mode->hactive.typ) |
91 	       SUNXI_LCDC_Y(mode->vactive.typ), &lcdc->tcon0_timing_active);
92 
93 	bp = mode->hsync_len.typ + mode->hback_porch.typ;
94 	total = mode->hactive.typ + mode->hfront_porch.typ + bp;
95 	writel(SUNXI_LCDC_TCON0_TIMING_H_TOTAL(total) |
96 	       SUNXI_LCDC_TCON0_TIMING_H_BP(bp), &lcdc->tcon0_timing_h);
97 
98 	bp = mode->vsync_len.typ + mode->vback_porch.typ;
99 	total = mode->vactive.typ + mode->vfront_porch.typ + bp;
100 	writel(SUNXI_LCDC_TCON0_TIMING_V_TOTAL(total) |
101 	       SUNXI_LCDC_TCON0_TIMING_V_BP(bp), &lcdc->tcon0_timing_v);
102 
103 #if defined(CONFIG_VIDEO_LCD_IF_PARALLEL) || defined(CONFIG_VIDEO_DE2)
104 	writel(SUNXI_LCDC_X(mode->hsync_len.typ) |
105 	       SUNXI_LCDC_Y(mode->vsync_len.typ), &lcdc->tcon0_timing_sync);
106 
107 	writel(0, &lcdc->tcon0_hv_intf);
108 	writel(0, &lcdc->tcon0_cpu_intf);
109 #endif
110 #ifdef CONFIG_VIDEO_LCD_IF_LVDS
111 	val = (depth == 18) ? 1 : 0;
112 	writel(SUNXI_LCDC_TCON0_LVDS_INTF_BITWIDTH(val) |
113 	       SUNXI_LCDC_TCON0_LVDS_CLK_SEL_TCON0, &lcdc->tcon0_lvds_intf);
114 #endif
115 
116 	if (depth == 18 || depth == 16) {
117 		writel(SUNXI_LCDC_TCON0_FRM_SEED, &lcdc->tcon0_frm_seed[0]);
118 		writel(SUNXI_LCDC_TCON0_FRM_SEED, &lcdc->tcon0_frm_seed[1]);
119 		writel(SUNXI_LCDC_TCON0_FRM_SEED, &lcdc->tcon0_frm_seed[2]);
120 		writel(SUNXI_LCDC_TCON0_FRM_SEED, &lcdc->tcon0_frm_seed[3]);
121 		writel(SUNXI_LCDC_TCON0_FRM_SEED, &lcdc->tcon0_frm_seed[4]);
122 		writel(SUNXI_LCDC_TCON0_FRM_SEED, &lcdc->tcon0_frm_seed[5]);
123 		writel(SUNXI_LCDC_TCON0_FRM_TAB0, &lcdc->tcon0_frm_table[0]);
124 		writel(SUNXI_LCDC_TCON0_FRM_TAB1, &lcdc->tcon0_frm_table[1]);
125 		writel(SUNXI_LCDC_TCON0_FRM_TAB2, &lcdc->tcon0_frm_table[2]);
126 		writel(SUNXI_LCDC_TCON0_FRM_TAB3, &lcdc->tcon0_frm_table[3]);
127 		writel(((depth == 18) ?
128 			SUNXI_LCDC_TCON0_FRM_CTRL_RGB666 :
129 			SUNXI_LCDC_TCON0_FRM_CTRL_RGB565),
130 		       &lcdc->tcon0_frm_ctrl);
131 	}
132 
133 	val = SUNXI_LCDC_TCON0_IO_POL_DCLK_PHASE(dclk_phase);
134 	if (mode->flags & DISPLAY_FLAGS_HSYNC_LOW)
135 		val |= SUNXI_LCDC_TCON_HSYNC_MASK;
136 	if (mode->flags & DISPLAY_FLAGS_VSYNC_LOW)
137 		val |= SUNXI_LCDC_TCON_VSYNC_MASK;
138 
139 #ifdef CONFIG_VIDEO_VGA_VIA_LCD_FORCE_SYNC_ACTIVE_HIGH
140 	if (for_ext_vga_dac)
141 		val = 0;
142 #endif
143 	writel(val, &lcdc->tcon0_io_polarity);
144 
145 	writel(0, &lcdc->tcon0_io_tristate);
146 }
147 
lcdc_tcon1_mode_set(struct sunxi_lcdc_reg * const lcdc,const struct display_timing * mode,bool ext_hvsync,bool is_composite)148 void lcdc_tcon1_mode_set(struct sunxi_lcdc_reg * const lcdc,
149 			 const struct display_timing *mode,
150 			 bool ext_hvsync, bool is_composite)
151 {
152 	int bp, clk_delay, total, val, yres;
153 
154 #ifndef CONFIG_SUNXI_DE2
155 	/* Use tcon1 */
156 	clrsetbits_le32(&lcdc->ctrl, SUNXI_LCDC_CTRL_IO_MAP_MASK,
157 			SUNXI_LCDC_CTRL_IO_MAP_TCON1);
158 #endif
159 
160 	clk_delay = lcdc_get_clk_delay(mode, 1);
161 	writel(SUNXI_LCDC_TCON1_CTRL_ENABLE |
162 	       ((mode->flags & DISPLAY_FLAGS_INTERLACED) ?
163 			SUNXI_LCDC_TCON1_CTRL_INTERLACE_ENABLE : 0) |
164 	       SUNXI_LCDC_TCON1_CTRL_CLK_DELAY(clk_delay), &lcdc->tcon1_ctrl);
165 
166 	yres = mode->vactive.typ;
167 	if (mode->flags & DISPLAY_FLAGS_INTERLACED)
168 		yres /= 2;
169 	writel(SUNXI_LCDC_X(mode->hactive.typ) | SUNXI_LCDC_Y(yres),
170 	       &lcdc->tcon1_timing_source);
171 	writel(SUNXI_LCDC_X(mode->hactive.typ) | SUNXI_LCDC_Y(yres),
172 	       &lcdc->tcon1_timing_scale);
173 	writel(SUNXI_LCDC_X(mode->hactive.typ) | SUNXI_LCDC_Y(yres),
174 	       &lcdc->tcon1_timing_out);
175 
176 	bp = mode->hsync_len.typ + mode->hback_porch.typ;
177 	total = mode->hactive.typ + mode->hfront_porch.typ + bp;
178 	writel(SUNXI_LCDC_TCON1_TIMING_H_TOTAL(total) |
179 	       SUNXI_LCDC_TCON1_TIMING_H_BP(bp), &lcdc->tcon1_timing_h);
180 
181 	bp = mode->vsync_len.typ + mode->vback_porch.typ;
182 	total = mode->vactive.typ + mode->vfront_porch.typ + bp;
183 	if (!(mode->flags & DISPLAY_FLAGS_INTERLACED))
184 		total *= 2;
185 	writel(SUNXI_LCDC_TCON1_TIMING_V_TOTAL(total) |
186 	       SUNXI_LCDC_TCON1_TIMING_V_BP(bp), &lcdc->tcon1_timing_v);
187 
188 	writel(SUNXI_LCDC_X(mode->hsync_len.typ) |
189 	       SUNXI_LCDC_Y(mode->vsync_len.typ), &lcdc->tcon1_timing_sync);
190 
191 	if (ext_hvsync) {
192 		val = 0;
193 		if (mode->flags & DISPLAY_FLAGS_HSYNC_HIGH)
194 			val |= SUNXI_LCDC_TCON_HSYNC_MASK;
195 		if (mode->flags & DISPLAY_FLAGS_VSYNC_HIGH)
196 			val |= SUNXI_LCDC_TCON_VSYNC_MASK;
197 		writel(val, &lcdc->tcon1_io_polarity);
198 
199 		clrbits_le32(&lcdc->tcon1_io_tristate,
200 			     SUNXI_LCDC_TCON_VSYNC_MASK |
201 			     SUNXI_LCDC_TCON_HSYNC_MASK);
202 	}
203 
204 #ifdef CONFIG_MACH_SUN5I
205 	if (is_composite)
206 		clrsetbits_le32(&lcdc->mux_ctrl, SUNXI_LCDC_MUX_CTRL_SRC0_MASK,
207 				SUNXI_LCDC_MUX_CTRL_SRC0(1));
208 #endif
209 }
210 
lcdc_pll_set(struct sunxi_ccm_reg * ccm,int tcon,int dotclock,int * clk_div,int * clk_double,bool is_composite)211 void lcdc_pll_set(struct sunxi_ccm_reg *ccm, int tcon, int dotclock,
212 		  int *clk_div, int *clk_double, bool is_composite)
213 {
214 	int value, n, m, min_m, max_m, diff, step;
215 	int best_n = 0, best_m = 0, best_diff = 0x0FFFFFFF;
216 	int best_double = 0;
217 	bool use_mipi_pll = false;
218 
219 #ifdef CONFIG_SUNXI_DE2
220 	step = 6000;
221 #else
222 	step = 3000;
223 #endif
224 
225 	if (tcon == 0) {
226 #if defined(CONFIG_VIDEO_LCD_IF_PARALLEL) || defined(CONFIG_SUNXI_DE2)
227 		min_m = 6;
228 		max_m = 127;
229 #endif
230 #ifdef CONFIG_VIDEO_LCD_IF_LVDS
231 		min_m = 7;
232 		max_m = 7;
233 #endif
234 	} else {
235 		min_m = 1;
236 		max_m = 15;
237 	}
238 
239 	/*
240 	 * Find the lowest divider resulting in a matching clock, if there
241 	 * is no match, pick the closest lower clock, as monitors tend to
242 	 * not sync to higher frequencies.
243 	 */
244 	for (m = min_m; m <= max_m; m++) {
245 #ifndef CONFIG_SUNXI_DE2
246 		n = (m * dotclock) / step;
247 
248 		if ((n >= 9) && (n <= 127)) {
249 			value = (step * n) / m;
250 			diff = dotclock - value;
251 			if (diff < best_diff) {
252 				best_diff = diff;
253 				best_m = m;
254 				best_n = n;
255 				best_double = 0;
256 			}
257 		}
258 
259 		/* These are just duplicates */
260 		if (!(m & 1))
261 			continue;
262 #endif
263 
264 		/* No double clock on DE2 */
265 		n = (m * dotclock) / (step * 2);
266 		if ((n >= 9) && (n <= 127)) {
267 			value = (step * 2 * n) / m;
268 			diff = dotclock - value;
269 			if (diff < best_diff) {
270 				best_diff = diff;
271 				best_m = m;
272 				best_n = n;
273 				best_double = 1;
274 			}
275 		}
276 	}
277 
278 #ifdef CONFIG_MACH_SUN6I
279 	/*
280 	 * Use the MIPI pll if we've been unable to find any matching setting
281 	 * for PLL3, this happens with high dotclocks because of min_m = 6.
282 	 */
283 	if (tcon == 0 && best_n == 0) {
284 		use_mipi_pll = true;
285 		best_m = 6;  /* Minimum m for tcon0 */
286 	}
287 
288 	if (use_mipi_pll) {
289 		clock_set_pll3(297000000); /* Fix the video pll at 297 MHz */
290 		clock_set_mipi_pll(best_m * dotclock * 1000);
291 		debug("dotclock: %dkHz = %dkHz via mipi pll\n",
292 		      dotclock, clock_get_mipi_pll() / best_m / 1000);
293 	} else
294 #endif
295 	{
296 		clock_set_pll3(best_n * step * 1000);
297 		debug("dotclock: %dkHz = %dkHz: (%d * %dkHz * %d) / %d\n",
298 		      dotclock,
299 		      (best_double + 1) * clock_get_pll3() / best_m / 1000,
300 		      best_double + 1, step, best_n, best_m);
301 	}
302 
303 	if (tcon == 0) {
304 		u32 pll;
305 
306 		if (use_mipi_pll)
307 			pll = CCM_LCD_CH0_CTRL_MIPI_PLL;
308 		else if (best_double)
309 			pll = CCM_LCD_CH0_CTRL_PLL3_2X;
310 		else
311 			pll = CCM_LCD_CH0_CTRL_PLL3;
312 #ifndef CONFIG_SUNXI_DE2
313 		writel(CCM_LCD_CH0_CTRL_GATE | CCM_LCD_CH0_CTRL_RST | pll,
314 		       &ccm->lcd0_ch0_clk_cfg);
315 #else
316 		writel(CCM_LCD_CH0_CTRL_GATE | CCM_LCD_CH0_CTRL_RST | pll,
317 		       &ccm->lcd0_clk_cfg);
318 #endif
319 	}
320 #ifndef CONFIG_SUNXI_DE2
321 	else {
322 		writel(CCM_LCD_CH1_CTRL_GATE |
323 		       (best_double ? CCM_LCD_CH1_CTRL_PLL3_2X :
324 				      CCM_LCD_CH1_CTRL_PLL3) |
325 		       CCM_LCD_CH1_CTRL_M(best_m), &ccm->lcd0_ch1_clk_cfg);
326 		if (is_composite)
327 			setbits_le32(&ccm->lcd0_ch1_clk_cfg,
328 				     CCM_LCD_CH1_CTRL_HALF_SCLK1);
329 	}
330 #endif
331 
332 	*clk_div = best_m;
333 	*clk_double = best_double;
334 }
335