drivers/video/am335x-fb.c

1 // SPDX-License-Identifier: GPL-2.0+
3  * Copyright (C) 2013-2018 Hannes Schmelzer <oe5hpm@oevsv.at>
4  * B&R Industrial Automation GmbH - http://www.br-automation.com
7  * Wolfgang Denk's LCD-Framework (CONFIG_LCD, common/lcd.c)
9  * - supporting 16/24/32bit RGB/TFT raster Mode (not using palette)
10  * - sets up LCD controller as in 'am335x_lcdpanel' struct given
11  * - starts output DMA from gd->fb_base buffer
20 #include "am335x-fb.h"
23 #error "hw-base address of LCD-Controller (LCD_CNTL_BASE) not defined!"
43 #define LCD_HBPLSB(x)				((((x)-1) & 0xFF) << 24)
44 #define LCD_HFPLSB(x)				((((x)-1) & 0xFF) << 16)
45 #define LCD_HSWLSB(x)				((((x)-1) & 0x3F) << 10)
46 #define LCD_HORLSB(x)				(((((x) >> 4)-1) & 0x3F) << 4)
47 #define LCD_HORMSB(x)				(((((x) >> 4)-1) & 0x40) >> 4)
51 #define LCD_VSW(x)				(((x)-1) << 10)
52 #define LCD_VERLSB(x)				(((x)-1) & 0x3FF)
54 #define LCD_HSWMSB(x)				((((x)-1) & 0x3C0) << 21)
55 #define LCD_VERMSB(x)				((((x)-1) & 0x400) << 16)
56 #define LCD_HBPMSB(x)				((((x)-1) & 0x300) >> 4)
57 #define LCD_HFPMSB(x)				((((x)-1) & 0x300) >> 8)
59 /* LCD Raster Ctrl Register */
68 #define FBSIZE(x)	((x->hactive * x->vactive * x->bpp) >> 3)
72 	unsigned int		ctrl;			/* 0x04 */  member
117 	struct dpll_params dpll_disp = { 1, 0, 1, -1, -1, -1, -1 };  in am335xfb_init()
121 	if (gd->fb_base == 0) {  in am335xfb_init()
123 		return -1;  in am335xfb_init()
127 		return -1;  in am335xfb_init()
131 	switch (panel->bpp) {  in am335xfb_init()
141 		pr_err("am335x-fb: invalid bpp value: %d\n", panel->bpp);  in am335xfb_init()
142 		return -1;  in am335xfb_init()
145 	/* check given clock-frequency */  in am335xfb_init()
146 	if (panel->pxl_clk > (LCDC_FMAX / 2)) {  in am335xfb_init()
147 		pr_err("am335x-fb: requested pxl-clk: %d not supported!\n",  in am335xfb_init()
148 		       panel->pxl_clk);  in am335xfb_init()
149 		return -1;  in am335xfb_init()
152 	debug("setting up LCD-Controller for %dx%dx%d (hfp=%d,hbp=%d,hsw=%d / ",  in am335xfb_init()
153 	      panel->hactive, panel->vactive, panel->bpp,  in am335xfb_init()
154 	      panel->hfp, panel->hbp, panel->hsw);  in am335xfb_init()
156 	      panel->vfp, panel->vfp, panel->vsw, panel->pxl_clk);  in am335xfb_init()
158 	      (unsigned int)gd->fb_base, FBSIZE(panel));  in am335xfb_init()
161 	err = panel->pxl_clk;  in am335xfb_init()
166 			if ((V_OSCK * m) < (panel->pxl_clk * d))  in am335xfb_init()
168 			n = (V_OSCK * m) / (panel->pxl_clk * d);  in am335xfb_init()
174 			err = abs((V_OSCK * m) / n / d - panel->pxl_clk);  in am335xfb_init()
188 	writel(0x0, &cmdpll->clklcdcpixelclk);  in am335xfb_init()
191 	memset((void *)gd->fb_base, 0, 0x20);  in am335xfb_init()
192 	*(unsigned int *)gd->fb_base = 0x4000;  in am335xfb_init()
194 	gd->fb_base += 0x20;  in am335xfb_init()
197 	if (panel->panel_power_ctrl != NULL)  in am335xfb_init()
198 		panel->panel_power_ctrl(1);  in am335xfb_init()
200 	debug("am335x-fb: wait for stable power ...\n");  in am335xfb_init()
201 	mdelay(panel->pup_delay);  in am335xfb_init()
202 	lcdhw->clkc_enable = LCD_CORECLKEN | LCD_LIDDCLKEN | LCD_DMACLKEN;  in am335xfb_init()
203 	lcdhw->raster_ctrl = 0;  in am335xfb_init()
204 	lcdhw->ctrl = LCD_CLK_DIVISOR(best_d) | LCD_RASTER_MODE;  in am335xfb_init()
205 	lcdhw->lcddma_fb0_base = gd->fb_base;  in am335xfb_init()
206 	lcdhw->lcddma_fb0_ceiling = gd->fb_base + FBSIZE(panel);  in am335xfb_init()
207 	lcdhw->lcddma_fb1_base = gd->fb_base;  in am335xfb_init()
208 	lcdhw->lcddma_fb1_ceiling = gd->fb_base + FBSIZE(panel);  in am335xfb_init()
209 	lcdhw->lcddma_ctrl = LCD_DMA_BURST_SIZE(LCD_DMA_BURST_16);  in am335xfb_init()
211 	lcdhw->raster_timing0 = LCD_HORLSB(panel->hactive) |  in am335xfb_init()
212 				LCD_HORMSB(panel->hactive) |  in am335xfb_init()
213 				LCD_HFPLSB(panel->hfp) |  in am335xfb_init()
214 				LCD_HBPLSB(panel->hbp) |  in am335xfb_init()
215 				LCD_HSWLSB(panel->hsw);  in am335xfb_init()
216 	lcdhw->raster_timing1 = LCD_VBP(panel->vbp) |  in am335xfb_init()
217 				LCD_VFP(panel->vfp) |  in am335xfb_init()
218 				LCD_VSW(panel->vsw) |  in am335xfb_init()
219 				LCD_VERLSB(panel->vactive);  in am335xfb_init()
220 	lcdhw->raster_timing2 = LCD_HSWMSB(panel->hsw) |  in am335xfb_init()
221 				LCD_VERMSB(panel->vactive) |  in am335xfb_init()
222 				LCD_INVMASK(panel->pol) |  in am335xfb_init()
223 				LCD_HBPMSB(panel->hbp) |  in am335xfb_init()
224 				LCD_HFPMSB(panel->hfp) |  in am335xfb_init()
225 				0x0000FF00;	/* clk cycles for ac-bias */  in am335xfb_init()
226 	lcdhw->raster_ctrl =	raster_ctrl |  in am335xfb_init()
231 	debug("am335x-fb: waiting picture to be stable.\n.");  in am335xfb_init()
232 	mdelay(panel->pon_delay);  in am335xfb_init()