2 * Copyright 2007-2011 Freescale Semiconductor, Inc.
3 * Authors: York Sun <yorksun@freescale.com>
4 * Timur Tabi <timur@freescale.com>
6 * FSL DIU Framebuffer driver
8 * See file CREDITS for list of people who contributed to this
11 * This program is free software; you can redistribute it and/or
12 * modify it under the terms of the GNU General Public License as
13 * published by the Free Software Foundation; either version 2 of
14 * the License, or (at your option) any later version.
16 * This program is distributed in the hope that it will be useful,
17 * but WITHOUT ANY WARRANTY; without even the implied warranty of
18 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
19 * GNU General Public License for more details.
21 * You should have received a copy of the GNU General Public License
22 * along with this program; if not, write to the Free Software
23 * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
30 #include <fsl_diu_fb.h>
31 #include "../common/pixis.h"
33 #define PX_BRDCFG0_DLINK 0x10
34 #define PX_BRDCFG0_DVISEL 0x08
36 void diu_set_pixel_clock(unsigned int pixclock)
38 volatile immap_t *immap = (immap_t *)CONFIG_SYS_IMMR;
39 volatile ccsr_gur_t *gur = &immap->im_gur;
40 volatile unsigned int *guts_clkdvdr = &gur->clkdvdr;
41 unsigned long speed_ccb, temp, pixval;
43 speed_ccb = get_bus_freq(0);
44 temp = 1000000000/pixclock;
46 pixval = speed_ccb / temp;
47 debug("DIU pixval = %lu\n", pixval);
49 /* Modify PXCLK in GUTS CLKDVDR */
50 debug("DIU: Current value of CLKDVDR = 0x%08x\n", *guts_clkdvdr);
51 temp = *guts_clkdvdr & 0x2000FFFF;
52 *guts_clkdvdr = temp; /* turn off clock */
53 *guts_clkdvdr = temp | 0x80000000 | ((pixval & 0x1F) << 16);
54 debug("DIU: Modified value of CLKDVDR = 0x%08x\n", *guts_clkdvdr);
57 int platform_diu_init(unsigned int xres, unsigned int yres, const char *port)
61 u32 pixel_format = 0x88883316;
64 temp = in_8(&pixis->brdcfg0);
66 if (strncmp(port, "dlvds", 5) == 0) {
69 temp &= ~(PX_BRDCFG0_DLINK | PX_BRDCFG0_DVISEL);
70 name = "Dual-Link LVDS";
71 } else if (strncmp(port, "lvds", 4) == 0) {
72 /* Single link LVDS */
73 temp = (temp & ~PX_BRDCFG0_DVISEL) | PX_BRDCFG0_DLINK;
74 name = "Single-Link LVDS";
77 if (in_8(&pixis->ver) == 1) /* Board version */
78 pixel_format = 0x88882317;
79 temp |= PX_BRDCFG0_DVISEL;
83 printf("DIU: Switching to %s monitor @ %ux%u\n", name, xres, yres);
84 out_8(&pixis->brdcfg0, temp);
86 return fsl_diu_init(xres, pixel_format, gamma_fix);