xref: /openbmc/u-boot/board/freescale/mpc8610hpcd/mpc8610hpcd_diu.c (revision 284170309cab2006e7730c65454458680921b16a)
1 /*
2  * Copyright 2007 Freescale Semiconductor, Inc.
3  * York Sun <yorksun@freescale.com>
4  *
5  * FSL DIU Framebuffer driver
6  *
7  * See file CREDITS for list of people who contributed to this
8  * project.
9  *
10  * This program is free software; you can redistribute it and/or
11  * modify it under the terms of the GNU General Public License as
12  * published by the Free Software Foundation; either version 2 of
13  * the License, or (at your option) any later version.
14  *
15  * This program is distributed in the hope that it will be useful,
16  * but WITHOUT ANY WARRANTY; without even the implied warranty of
17  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
18  * GNU General Public License for more details.
19  *
20  * You should have received a copy of the GNU General Public License
21  * along with this program; if not, write to the Free Software
22  * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
23  * MA 02111-1307 USA
24  */
25 
26 #include <common.h>
27 #include <command.h>
28 #include <asm/io.h>
29 #include <fsl_diu_fb.h>
30 
31 void diu_set_pixel_clock(unsigned int pixclock)
32 {
33 	volatile immap_t *immap = (immap_t *)CONFIG_SYS_IMMR;
34 	volatile ccsr_gur_t *gur = &immap->im_gur;
35 	volatile unsigned int *guts_clkdvdr = &gur->clkdvdr;
36 	unsigned long speed_ccb, temp, pixval;
37 
38 	speed_ccb = get_bus_freq(0);
39 	temp = 1000000000/pixclock;
40 	temp *= 1000;
41 	pixval = speed_ccb / temp;
42 	debug("DIU pixval = %lu\n", pixval);
43 
44 	/* Modify PXCLK in GUTS CLKDVDR */
45 	debug("DIU: Current value of CLKDVDR = 0x%08x\n", *guts_clkdvdr);
46 	temp = *guts_clkdvdr & 0x2000FFFF;
47 	*guts_clkdvdr = temp;				/* turn off clock */
48 	*guts_clkdvdr = temp | 0x80000000 | ((pixval & 0x1F) << 16);
49 	debug("DIU: Modified value of CLKDVDR = 0x%08x\n", *guts_clkdvdr);
50 }
51 
52 int platform_diu_init(unsigned int *xres, unsigned int *yres)
53 {
54 	char *monitor_port;
55 	int gamma_fix;
56 	unsigned int pixel_format;
57 	unsigned char tmp_val;
58 	unsigned char pixis_arch;
59 	u8 *pixis_base = (u8 *)PIXIS_BASE;
60 
61 	tmp_val = in_8(pixis_base + PIXIS_BRDCFG0);
62 	pixis_arch = in_8(pixis_base + PIXIS_VER);
63 
64 	monitor_port = getenv("monitor");
65 	if (!strncmp(monitor_port, "0", 1)) {	/* 0 - DVI */
66 		*xres = 1280;
67 		*yres = 1024;
68 		if (pixis_arch == 0x01)
69 			pixel_format = 0x88882317;
70 		else
71 			pixel_format = 0x88883316;
72 		gamma_fix = 0;
73 		out_8(pixis_base + PIXIS_BRDCFG0, tmp_val | 0x08);
74 
75 	} else if (!strncmp(monitor_port, "1", 1)) { /* 1 - Single link LVDS */
76 		*xres = 1024;
77 		*yres = 768;
78 		pixel_format = 0x88883316;
79 		gamma_fix = 0;
80 		out_8(pixis_base + PIXIS_BRDCFG0, (tmp_val & 0xf7) | 0x10);
81 
82 	} else if (!strncmp(monitor_port, "2", 1)) { /* 2 - Double link LVDS */
83 		*xres = 1280;
84 		*yres = 1024;
85 		pixel_format = 0x88883316;
86 		gamma_fix = 1;
87 		out_8(pixis_base + PIXIS_BRDCFG0, tmp_val & 0xe7);
88 
89 	} else {	/* DVI */
90 		*xres = 1280;
91 		*yres = 1024;
92 		pixel_format = 0x88882317;
93 		gamma_fix = 0;
94 		out_8(pixis_base + PIXIS_BRDCFG0, tmp_val | 0x08);
95 	}
96 
97 	return fsl_diu_init(*xres, pixel_format, gamma_fix);
98 }
99