drivers/video/mxsfb.c

   1 /*
   2  * Freescale i.MX23/i.MX28 LCDIF driver
   3  *
   4  * Copyright (C) 2011-2013 Marek Vasut <marex@denx.de>
   5  *
   6  * SPDX-License-Identifier:     GPL-2.0+
   7  */
   8 #include <common.h>
   9 #include <malloc.h>
  10 #include <video_fb.h>
  11
  12 #include <asm/arch/imx-regs.h>
  13 #include <asm/arch/clock.h>
  14 #include <asm/arch/sys_proto.h>
  15 #include <asm/errno.h>
  16 #include <asm/io.h>
  17
  18 #include "videomodes.h"
  19
  20 #define PS2KHZ(ps)      (1000000000UL / (ps))
  21
  22 static GraphicDevice panel;
  23
  24 /*
  25  * DENX M28EVK:
  26  * setenv videomode
  27  * video=ctfb:x:800,y:480,depth:18,mode:0,pclk:30066,
  28  *       le:0,ri:256,up:0,lo:45,hs:1,vs:1,sync:100663296,vmode:0
  29  *
  30  * Freescale mx23evk/mx28evk with a Seiko 4.3'' WVGA panel:
  31  * setenv videomode
  32  * video=ctfb:x:800,y:480,depth:24,mode:0,pclk:29851,
  33  *       le:89,ri:164,up:23,lo:10,hs:10,vs:10,sync:0,vmode:0
  34  */
  35
  36 static void mxs_lcd_init(GraphicDevice *panel,
  37                         struct ctfb_res_modes *mode, int bpp)
  38 {
  39         struct mxs_lcdif_regs *regs = (struct mxs_lcdif_regs *)MXS_LCDIF_BASE;
  40         uint32_t word_len = 0, bus_width = 0;
  41         uint8_t valid_data = 0;
  42
  43         /* Kick in the LCDIF clock */
  44         mxs_set_lcdclk(PS2KHZ(mode->pixclock));
  45
  46         /* Restart the LCDIF block */
  47         mxs_reset_block(&regs->hw_lcdif_ctrl_reg);
  48
  49         switch (bpp) {
  50         case 24:
  51                 word_len = LCDIF_CTRL_WORD_LENGTH_24BIT;
  52                 bus_width = LCDIF_CTRL_LCD_DATABUS_WIDTH_24BIT;
  53                 valid_data = 0x7;
  54                 break;
  55         case 18:
  56                 word_len = LCDIF_CTRL_WORD_LENGTH_24BIT;
  57                 bus_width = LCDIF_CTRL_LCD_DATABUS_WIDTH_18BIT;
  58                 valid_data = 0x7;
  59                 break;
  60         case 16:
  61                 word_len = LCDIF_CTRL_WORD_LENGTH_16BIT;
  62                 bus_width = LCDIF_CTRL_LCD_DATABUS_WIDTH_16BIT;
  63                 valid_data = 0xf;
  64                 break;
  65         case 8:
  66                 word_len = LCDIF_CTRL_WORD_LENGTH_8BIT;
  67                 bus_width = LCDIF_CTRL_LCD_DATABUS_WIDTH_8BIT;
  68                 valid_data = 0xf;
  69                 break;
  70         }
  71
  72         writel(bus_width | word_len | LCDIF_CTRL_DOTCLK_MODE |
  73                 LCDIF_CTRL_BYPASS_COUNT | LCDIF_CTRL_LCDIF_MASTER,
  74                 &regs->hw_lcdif_ctrl);
  75
  76         writel(valid_data << LCDIF_CTRL1_BYTE_PACKING_FORMAT_OFFSET,
  77                 &regs->hw_lcdif_ctrl1);
  78         writel((mode->yres << LCDIF_TRANSFER_COUNT_V_COUNT_OFFSET) | mode->xres,
  79                 &regs->hw_lcdif_transfer_count);
  80
  81         writel(LCDIF_VDCTRL0_ENABLE_PRESENT | LCDIF_VDCTRL0_ENABLE_POL |
  82                 LCDIF_VDCTRL0_VSYNC_PERIOD_UNIT |
  83                 LCDIF_VDCTRL0_VSYNC_PULSE_WIDTH_UNIT |
  84                 mode->vsync_len, &regs->hw_lcdif_vdctrl0);
  85         writel(mode->upper_margin + mode->lower_margin +
  86                 mode->vsync_len + mode->yres,
  87                 &regs->hw_lcdif_vdctrl1);
  88         writel((mode->hsync_len << LCDIF_VDCTRL2_HSYNC_PULSE_WIDTH_OFFSET) |
  89                 (mode->left_margin + mode->right_margin +
  90                 mode->hsync_len + mode->xres),
  91                 &regs->hw_lcdif_vdctrl2);
  92         writel(((mode->left_margin + mode->hsync_len) <<
  93                 LCDIF_VDCTRL3_HORIZONTAL_WAIT_CNT_OFFSET) |
  94                 (mode->upper_margin + mode->vsync_len),
  95                 &regs->hw_lcdif_vdctrl3);
  96         writel((0 << LCDIF_VDCTRL4_DOTCLK_DLY_SEL_OFFSET) | mode->xres,
  97                 &regs->hw_lcdif_vdctrl4);
  98
  99         writel(panel->frameAdrs, &regs->hw_lcdif_cur_buf);
 100         writel(panel->frameAdrs, &regs->hw_lcdif_next_buf);
 101
 102         /* Flush FIFO first */
 103         writel(LCDIF_CTRL1_FIFO_CLEAR, &regs->hw_lcdif_ctrl1_set);
 104
 105         /* Sync signals ON */
 106         setbits_le32(&regs->hw_lcdif_vdctrl4, LCDIF_VDCTRL4_SYNC_SIGNALS_ON);
 107
 108         /* FIFO cleared */
 109         writel(LCDIF_CTRL1_FIFO_CLEAR, &regs->hw_lcdif_ctrl1_clr);
 110
 111         /* RUN! */
 112         writel(LCDIF_CTRL_RUN, &regs->hw_lcdif_ctrl_set);
 113 }
 114
 115 void *video_hw_init(void)
 116 {
 117         int bpp = -1;
 118         char *penv;
 119         void *fb;
 120         struct ctfb_res_modes mode;
 121
 122         puts("Video: ");
 123
 124         /* Suck display configuration from "videomode" variable */
 125         penv = getenv("videomode");
 126         if (!penv) {
 127                 puts("MXSFB: 'videomode' variable not set!\n");
 128                 return NULL;
 129         }
 130
 131         bpp = video_get_params(&mode, penv);
 132
 133         /* fill in Graphic device struct */
 134         sprintf(panel.modeIdent, "%dx%dx%d",
 135                         mode.xres, mode.yres, bpp);
 136
 137         panel.winSizeX = mode.xres;
 138         panel.winSizeY = mode.yres;
 139         panel.plnSizeX = mode.xres;
 140         panel.plnSizeY = mode.yres;
 141
 142         switch (bpp) {
 143         case 24:
 144         case 18:
 145                 panel.gdfBytesPP = 4;
 146                 panel.gdfIndex = GDF_32BIT_X888RGB;
 147                 break;
 148         case 16:
 149                 panel.gdfBytesPP = 2;
 150                 panel.gdfIndex = GDF_16BIT_565RGB;
 151                 break;
 152         case 8:
 153                 panel.gdfBytesPP = 1;
 154                 panel.gdfIndex = GDF__8BIT_INDEX;
 155                 break;
 156         default:
 157                 printf("MXSFB: Invalid BPP specified! (bpp = %i)\n", bpp);
 158                 return NULL;
 159         }
 160
 161         panel.memSize = mode.xres * mode.yres * panel.gdfBytesPP;
 162
 163         /* Allocate framebuffer */
 164         fb = malloc(panel.memSize);
 165         if (!fb) {
 166                 printf("MXSFB: Error allocating framebuffer!\n");
 167                 return NULL;
 168         }
 169
 170         /* Wipe framebuffer */
 171         memset(fb, 0, panel.memSize);
 172
 173         panel.frameAdrs = (u32)fb;
 174
 175         printf("%s\n", panel.modeIdent);
 176
 177         /* Start framebuffer */
 178         mxs_lcd_init(&panel, &mode, bpp);
 179
 180         return (void *)&panel;
 181 }