drivers/video/am335x-fb.c

   1 /*
   2  * Copyright (C) 2013 Hannes Petermaier <oe5hpm@oevsv.at>
   3  * Bernecker & Rainer Industrieelektronik GmbH - http://www.br-automation.com
   4  *
   5  * minimal framebuffer driver for TI's AM335x SoC to be compatible with
   6  * Wolfgang Denk's LCD-Framework (CONFIG_LCD, common/lcd.c)
   7  *
   8  * - supporting only 24bit RGB/TFT raster Mode (not using palette)
   9  * - sets up LCD controller as in 'am335x_lcdpanel' struct given
  10  * - starts output DMA from gd->fb_base buffer
  11  *
  12  * SPDX-License-Identifier:     GPL-2.0+
  13  */
  14 #include <common.h>
  15 #include <asm/arch/hardware.h>
  16 #include <lcd.h>
  17 #include "am335x-fb.h"
  18
  19 #if !defined(LCD_CNTL_BASE)
  20 #error "hw-base address of LCD-Controller (LCD_CNTL_BASE) not defined!"
  21 #endif
  22
  23
  24 /* LCD Control Register */
  25 #define LCD_CLK_DIVISOR(x)                      ((x) << 8)
  26 #define LCD_RASTER_MODE                         0x01
  27 /* LCD Clock Enable Register */
  28 #define LCD_CORECLKEN                           (0x01 << 0)
  29 #define LCD_LIDDCLKEN                           (0x01 << 1)
  30 #define LCD_DMACLKEN                            (0x01 << 2)
  31 /* LCD DMA Control Register */
  32 #define LCD_DMA_BURST_SIZE(x)                   ((x) << 4)
  33 #define LCD_DMA_BURST_1                         0x0
  34 #define LCD_DMA_BURST_2                         0x1
  35 #define LCD_DMA_BURST_4                         0x2
  36 #define LCD_DMA_BURST_8                         0x3
  37 #define LCD_DMA_BURST_16                        0x4
  38 /* LCD Timing_0 Register */
  39 #define LCD_HBPLSB(x)                           ((((x)-1) & 0xFF) << 24)
  40 #define LCD_HFPLSB(x)                           ((((x)-1) & 0xFF) << 16)
  41 #define LCD_HSWLSB(x)                           ((((x)-1) & 0x3F) << 10)
  42 #define LCD_HORLSB(x)                           (((((x) >> 4)-1) & 0x3F) << 4)
  43 #define LCD_HORMSB(x)                           (((((x) >> 4)-1) & 0x40) >> 4)
  44 /* LCD Timing_1 Register */
  45 #define LCD_VBP(x)                              ((x) << 24)
  46 #define LCD_VFP(x)                              ((x) << 16)
  47 #define LCD_VSW(x)                              (((x)-1) << 10)
  48 #define LCD_VERLSB(x)                           (((x)-1) & 0x3FF)
  49 /* LCD Timing_2 Register */
  50 #define LCD_HSWMSB(x)                           ((((x)-1) & 0x3C0) << 21)
  51 #define LCD_VERMSB(x)                           ((((x)-1) & 0x400) << 16)
  52 #define LCD_HBPMSB(x)                           ((((x)-1) & 0x300) >> 4)
  53 #define LCD_HFPMSB(x)                           ((((x)-1) & 0x300) >> 8)
  54 #define LCD_INVMASK(x)                          ((x) & 0x3F00000)
  55 /* LCD Raster Ctrl Register */
  56 #define LCD_TFT_24BPP_MODE                      (1 << 25)
  57 #define LCD_TFT_24BPP_UNPACK                    (1 << 26)
  58 #define LCD_PALMODE_RAWDATA                     (0x10 << 20)
  59 #define LCD_TFT_MODE                            (0x01 << 7)
  60 #define LCD_RASTER_ENABLE                       (0x01 << 0)
  61
  62
  63 /* Macro definitions */
  64 #define FBSIZE(x)       ((x->hactive * x->vactive * x->bpp) >> 3)
  65
  66 struct am335x_lcdhw {
  67         unsigned int            pid;                    /* 0x00 */
  68         unsigned int            ctrl;                   /* 0x04 */
  69         unsigned int            gap0;                   /* 0x08 */
  70         unsigned int            lidd_ctrl;              /* 0x0C */
  71         unsigned int            lidd_cs0_conf;          /* 0x10 */
  72         unsigned int            lidd_cs0_addr;          /* 0x14 */
  73         unsigned int            lidd_cs0_data;          /* 0x18 */
  74         unsigned int            lidd_cs1_conf;          /* 0x1C */
  75         unsigned int            lidd_cs1_addr;          /* 0x20 */
  76         unsigned int            lidd_cs1_data;          /* 0x24 */
  77         unsigned int            raster_ctrl;            /* 0x28 */
  78         unsigned int            raster_timing0;         /* 0x2C */
  79         unsigned int            raster_timing1;         /* 0x30 */
  80         unsigned int            raster_timing2;         /* 0x34 */
  81         unsigned int            raster_subpanel;        /* 0x38 */
  82         unsigned int            raster_subpanel2;       /* 0x3C */
  83         unsigned int            lcddma_ctrl;            /* 0x40 */
  84         unsigned int            lcddma_fb0_base;        /* 0x44 */
  85         unsigned int            lcddma_fb0_ceiling;     /* 0x48 */
  86         unsigned int            lcddma_fb1_base;        /* 0x4C */
  87         unsigned int            lcddma_fb1_ceiling;     /* 0x50 */
  88         unsigned int            sysconfig;              /* 0x54 */
  89         unsigned int            irqstatus_raw;          /* 0x58 */
  90         unsigned int            irqstatus;              /* 0x5C */
  91         unsigned int            irqenable_set;          /* 0x60 */
  92         unsigned int            irqenable_clear;        /* 0x64 */
  93         unsigned int            gap1;                   /* 0x68 */
  94         unsigned int            clkc_enable;            /* 0x6C */
  95         unsigned int            clkc_reset;             /* 0x70 */
  96 };
  97
  98 static struct am335x_lcdhw *lcdhw = (void *)LCD_CNTL_BASE;
  99 DECLARE_GLOBAL_DATA_PTR;
 100
 101 int lcd_get_size(int *line_length)
 102 {
 103         *line_length = (panel_info.vl_col * NBITS(panel_info.vl_bpix)) / 8;
 104         return *line_length * panel_info.vl_row + 0x20;
 105 }
 106
 107 int am335xfb_init(struct am335x_lcdpanel *panel)
 108 {
 109         if (0 == gd->fb_base) {
 110                 printf("ERROR: no valid fb_base stored in GLOBAL_DATA_PTR!\n");
 111                 return -1;
 112         }
 113         if (0 == panel) {
 114                 printf("ERROR: missing ptr to am335x_lcdpanel!\n");
 115                 return -1;
 116         }
 117
 118         debug("setting up LCD-Controller for %dx%dx%d (hfp=%d,hbp=%d,hsw=%d / ",
 119               panel->hactive, panel->vactive, panel->bpp,
 120               panel->hfp, panel->hbp, panel->hsw);
 121         debug("vfp=%d,vbp=%d,vsw=%d / clk-div=%d)\n",
 122               panel->vfp, panel->vfp, panel->vsw, panel->pxl_clk_div);
 123         debug("using frambuffer at 0x%08x with size %d.\n",
 124               (unsigned int)gd->fb_base, FBSIZE(panel));
 125
 126         /* palette default entry */
 127         memset((void *)gd->fb_base, 0, 0x20);
 128         *(unsigned int *)gd->fb_base = 0x4000;
 129
 130         /* turn ON display through powercontrol function if accessible */
 131         if (0 != panel->panel_power_ctrl)
 132                 panel->panel_power_ctrl(1);
 133
 134         debug("am335x-fb: wait for stable power ...\n");
 135         mdelay(panel->pup_delay);
 136         lcdhw->clkc_enable = LCD_CORECLKEN | LCD_LIDDCLKEN | LCD_DMACLKEN;
 137         lcdhw->raster_ctrl = 0;
 138         lcdhw->ctrl = LCD_CLK_DIVISOR(panel->pxl_clk_div) | LCD_RASTER_MODE;
 139         lcdhw->lcddma_fb0_base = gd->fb_base;
 140         lcdhw->lcddma_fb0_ceiling = gd->fb_base + FBSIZE(panel) + 0x20;
 141         lcdhw->lcddma_fb1_base = gd->fb_base;
 142         lcdhw->lcddma_fb1_ceiling = gd->fb_base + FBSIZE(panel) + 0x20;
 143         lcdhw->lcddma_ctrl = LCD_DMA_BURST_SIZE(LCD_DMA_BURST_16);
 144
 145         lcdhw->raster_timing0 = LCD_HORLSB(panel->hactive) |
 146                                 LCD_HORMSB(panel->hactive) |
 147                                 LCD_HFPLSB(panel->hfp) |
 148                                 LCD_HBPLSB(panel->hbp) |
 149                                 LCD_HSWLSB(panel->hsw);
 150         lcdhw->raster_timing1 = LCD_VBP(panel->vbp) |
 151                                 LCD_VFP(panel->vfp) |
 152                                 LCD_VSW(panel->vsw) |
 153                                 LCD_VERLSB(panel->vactive);
 154         lcdhw->raster_timing2 = LCD_HSWMSB(panel->hsw) |
 155                                 LCD_VERMSB(panel->vactive) |
 156                                 LCD_INVMASK(panel->pol) |
 157                                 LCD_HBPMSB(panel->hbp) |
 158                                 LCD_HFPMSB(panel->hfp) |
 159                                 0x0000FF00;     /* clk cycles for ac-bias */
 160         lcdhw->raster_ctrl =    LCD_TFT_24BPP_MODE |
 161                                 LCD_TFT_24BPP_UNPACK |
 162                                 LCD_PALMODE_RAWDATA |
 163                                 LCD_TFT_MODE |
 164                                 LCD_RASTER_ENABLE;
 165
 166         gd->fb_base += 0x20;    /* point fb behind palette */
 167
 168         debug("am335x-fb: waiting picture to be stable.\n.");
 169         mdelay(panel->pon_delay);
 170
 171         return 0;
 172 }