1 // SPDX-License-Identifier: GPL-2.0+
3 * Copyright 2007-2011 Freescale Semiconductor, Inc.
4 * Authors: York Sun <yorksun@freescale.com>
5 * Timur Tabi <timur@freescale.com>
7 * FSL DIU Framebuffer driver
11 #include <clock_legacy.h>
15 #include <fsl_diu_fb.h>
16 #include "../common/pixis.h"
18 #define PX_BRDCFG0_DLINK 0x10
19 #define PX_BRDCFG0_DVISEL 0x08
21 void diu_set_pixel_clock(unsigned int pixclock)
23 volatile immap_t *immap = (immap_t *)CONFIG_SYS_IMMR;
24 volatile ccsr_gur_t *gur = &immap->im_gur;
25 volatile unsigned int *guts_clkdvdr = &gur->clkdvdr;
26 unsigned long speed_ccb, temp, pixval;
28 speed_ccb = get_bus_freq(0);
29 temp = 1000000000/pixclock;
31 pixval = speed_ccb / temp;
32 debug("DIU pixval = %lu\n", pixval);
34 /* Modify PXCLK in GUTS CLKDVDR */
35 debug("DIU: Current value of CLKDVDR = 0x%08x\n", *guts_clkdvdr);
36 temp = *guts_clkdvdr & 0x2000FFFF;
37 *guts_clkdvdr = temp; /* turn off clock */
38 *guts_clkdvdr = temp | 0x80000000 | ((pixval & 0x1F) << 16);
39 debug("DIU: Modified value of CLKDVDR = 0x%08x\n", *guts_clkdvdr);
42 int platform_diu_init(unsigned int xres, unsigned int yres, const char *port)
46 u32 pixel_format = 0x88883316;
49 temp = in_8(&pixis->brdcfg0);
51 if (strncmp(port, "dlvds", 5) == 0) {
54 temp &= ~(PX_BRDCFG0_DLINK | PX_BRDCFG0_DVISEL);
55 name = "Dual-Link LVDS";
56 } else if (strncmp(port, "lvds", 4) == 0) {
57 /* Single link LVDS */
58 temp = (temp & ~PX_BRDCFG0_DVISEL) | PX_BRDCFG0_DLINK;
59 name = "Single-Link LVDS";
62 if (in_8(&pixis->ver) == 1) /* Board version */
63 pixel_format = 0x88882317;
64 temp |= PX_BRDCFG0_DVISEL;
68 printf("DIU: Switching to %s monitor @ %ux%u\n", name, xres, yres);
69 out_8(&pixis->brdcfg0, temp);
71 return fsl_diu_init(xres, yres, pixel_format, gamma_fix);