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https://github.com/AsahiLinux/u-boot
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11f98d1f82
Currently the mxsfb driver takes the display timings from the 'videomode' environment variable. Provide an example on how to set 'videomode' for using splash screen on mx23evk and mx28vk boards. Signed-off-by: Fabio Estevam <fabio.estevam@freescale.com> Tested-by: Marek Vasut <marex@denx.de>
194 lines
5.1 KiB
C
194 lines
5.1 KiB
C
/*
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* Freescale i.MX23/i.MX28 LCDIF driver
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*
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* Copyright (C) 2011-2013 Marek Vasut <marex@denx.de>
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; either version 2 of
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* the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
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* MA 02111-1307 USA
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*/
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#include <common.h>
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#include <malloc.h>
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#include <video_fb.h>
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#include <asm/arch/imx-regs.h>
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#include <asm/arch/clock.h>
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#include <asm/arch/sys_proto.h>
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#include <asm/errno.h>
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#include <asm/io.h>
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#include "videomodes.h"
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#define PS2KHZ(ps) (1000000000UL / (ps))
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static GraphicDevice panel;
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/*
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* DENX M28EVK:
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* setenv videomode
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* video=ctfb:x:800,y:480,depth:18,mode:0,pclk:30066,
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* le:0,ri:256,up:0,lo:45,hs:1,vs:1,sync:100663296,vmode:0
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*
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* Freescale mx23evk/mx28evk with a Seiko 4.3'' WVGA panel:
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* setenv videomode
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* video=ctfb:x:800,y:480,depth:24,mode:0,pclk:29851,
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* le:89,ri:164,up:23,lo:10,hs:10,vs:10,sync:0,vmode:0
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*/
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static void mxs_lcd_init(GraphicDevice *panel,
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struct ctfb_res_modes *mode, int bpp)
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{
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struct mxs_lcdif_regs *regs = (struct mxs_lcdif_regs *)MXS_LCDIF_BASE;
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uint32_t word_len = 0, bus_width = 0;
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uint8_t valid_data = 0;
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/* Kick in the LCDIF clock */
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mxs_set_lcdclk(PS2KHZ(mode->pixclock));
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/* Restart the LCDIF block */
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mxs_reset_block(®s->hw_lcdif_ctrl_reg);
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switch (bpp) {
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case 24:
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word_len = LCDIF_CTRL_WORD_LENGTH_24BIT;
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bus_width = LCDIF_CTRL_LCD_DATABUS_WIDTH_24BIT;
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valid_data = 0x7;
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break;
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case 18:
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word_len = LCDIF_CTRL_WORD_LENGTH_24BIT;
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bus_width = LCDIF_CTRL_LCD_DATABUS_WIDTH_18BIT;
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valid_data = 0x7;
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break;
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case 16:
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word_len = LCDIF_CTRL_WORD_LENGTH_16BIT;
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bus_width = LCDIF_CTRL_LCD_DATABUS_WIDTH_16BIT;
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valid_data = 0xf;
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break;
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case 8:
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word_len = LCDIF_CTRL_WORD_LENGTH_8BIT;
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bus_width = LCDIF_CTRL_LCD_DATABUS_WIDTH_8BIT;
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valid_data = 0xf;
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break;
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}
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writel(bus_width | word_len | LCDIF_CTRL_DOTCLK_MODE |
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LCDIF_CTRL_BYPASS_COUNT | LCDIF_CTRL_LCDIF_MASTER,
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®s->hw_lcdif_ctrl);
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writel(valid_data << LCDIF_CTRL1_BYTE_PACKING_FORMAT_OFFSET,
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®s->hw_lcdif_ctrl1);
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writel((mode->yres << LCDIF_TRANSFER_COUNT_V_COUNT_OFFSET) | mode->xres,
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®s->hw_lcdif_transfer_count);
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writel(LCDIF_VDCTRL0_ENABLE_PRESENT | LCDIF_VDCTRL0_ENABLE_POL |
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LCDIF_VDCTRL0_VSYNC_PERIOD_UNIT |
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LCDIF_VDCTRL0_VSYNC_PULSE_WIDTH_UNIT |
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mode->vsync_len, ®s->hw_lcdif_vdctrl0);
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writel(mode->upper_margin + mode->lower_margin +
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mode->vsync_len + mode->yres,
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®s->hw_lcdif_vdctrl1);
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writel((mode->hsync_len << LCDIF_VDCTRL2_HSYNC_PULSE_WIDTH_OFFSET) |
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(mode->left_margin + mode->right_margin +
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mode->hsync_len + mode->xres),
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®s->hw_lcdif_vdctrl2);
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writel(((mode->left_margin + mode->hsync_len) <<
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LCDIF_VDCTRL3_HORIZONTAL_WAIT_CNT_OFFSET) |
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(mode->upper_margin + mode->vsync_len),
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®s->hw_lcdif_vdctrl3);
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writel((0 << LCDIF_VDCTRL4_DOTCLK_DLY_SEL_OFFSET) | mode->xres,
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®s->hw_lcdif_vdctrl4);
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writel(panel->frameAdrs, ®s->hw_lcdif_cur_buf);
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writel(panel->frameAdrs, ®s->hw_lcdif_next_buf);
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/* Flush FIFO first */
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writel(LCDIF_CTRL1_FIFO_CLEAR, ®s->hw_lcdif_ctrl1_set);
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/* Sync signals ON */
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setbits_le32(®s->hw_lcdif_vdctrl4, LCDIF_VDCTRL4_SYNC_SIGNALS_ON);
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/* FIFO cleared */
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writel(LCDIF_CTRL1_FIFO_CLEAR, ®s->hw_lcdif_ctrl1_clr);
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/* RUN! */
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writel(LCDIF_CTRL_RUN, ®s->hw_lcdif_ctrl_set);
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}
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void *video_hw_init(void)
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{
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int bpp = -1;
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char *penv;
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void *fb;
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struct ctfb_res_modes mode;
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puts("Video: ");
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/* Suck display configuration from "videomode" variable */
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penv = getenv("videomode");
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if (!penv) {
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printf("MXSFB: 'videomode' variable not set!");
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return NULL;
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}
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bpp = video_get_params(&mode, penv);
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/* fill in Graphic device struct */
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sprintf(panel.modeIdent, "%dx%dx%d",
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mode.xres, mode.yres, bpp);
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panel.winSizeX = mode.xres;
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panel.winSizeY = mode.yres;
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panel.plnSizeX = mode.xres;
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panel.plnSizeY = mode.yres;
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switch (bpp) {
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case 24:
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case 18:
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panel.gdfBytesPP = 4;
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panel.gdfIndex = GDF_32BIT_X888RGB;
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break;
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case 16:
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panel.gdfBytesPP = 2;
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panel.gdfIndex = GDF_16BIT_565RGB;
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break;
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case 8:
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panel.gdfBytesPP = 1;
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panel.gdfIndex = GDF__8BIT_INDEX;
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break;
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default:
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printf("MXSFB: Invalid BPP specified! (bpp = %i)\n", bpp);
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return NULL;
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}
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panel.memSize = mode.xres * mode.yres * panel.gdfBytesPP;
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/* Allocate framebuffer */
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fb = malloc(panel.memSize);
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if (!fb) {
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printf("MXSFB: Error allocating framebuffer!\n");
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return NULL;
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}
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/* Wipe framebuffer */
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memset(fb, 0, panel.memSize);
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panel.frameAdrs = (u32)fb;
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printf("%s\n", panel.modeIdent);
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/* Start framebuffer */
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mxs_lcd_init(&panel, &mode, bpp);
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return (void *)&panel;
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}
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