drivers/video/am335x-fb.c

   1 /*
   2  * Copyright (C) 2013-2018 Hannes Schmelzer <oe5hpm@oevsv.at>
   3  * B&R Industrial Automation 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 16/24/32bit 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                     (0x02 << 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         u32 raster_ctrl = 0;
 110
 111         if (gd->fb_base == 0) {
 112                 printf("ERROR: no valid fb_base stored in GLOBAL_DATA_PTR!\n");
 113                 return -1;
 114         }
 115         if (panel == NULL) {
 116                 printf("ERROR: missing ptr to am335x_lcdpanel!\n");
 117                 return -1;
 118         }
 119
 120         /* We can already set the bits for the raster_ctrl in this check */
 121         switch (panel->bpp) {
 122         case 16:
 123                 break;
 124         case 32:
 125                 raster_ctrl |= LCD_TFT_24BPP_UNPACK;
 126                 /* fallthrough */
 127         case 24:
 128                 raster_ctrl |= LCD_TFT_24BPP_MODE;
 129                 break;
 130         default:
 131                 pr_err("am335x-fb: invalid bpp value: %d\n", panel->bpp);
 132                 return -1;
 133         }
 134
 135         debug("setting up LCD-Controller for %dx%dx%d (hfp=%d,hbp=%d,hsw=%d / ",
 136               panel->hactive, panel->vactive, panel->bpp,
 137               panel->hfp, panel->hbp, panel->hsw);
 138         debug("vfp=%d,vbp=%d,vsw=%d / clk-div=%d)\n",
 139               panel->vfp, panel->vfp, panel->vsw, panel->pxl_clk_div);
 140         debug("using frambuffer at 0x%08x with size %d.\n",
 141               (unsigned int)gd->fb_base, FBSIZE(panel));
 142
 143         /* palette default entry */
 144         memset((void *)gd->fb_base, 0, 0x20);
 145         *(unsigned int *)gd->fb_base = 0x4000;
 146         /* point fb behind palette */
 147         gd->fb_base += 0x20;
 148
 149         /* turn ON display through powercontrol function if accessible */
 150         if (panel->panel_power_ctrl != NULL)
 151                 panel->panel_power_ctrl(1);
 152
 153         debug("am335x-fb: wait for stable power ...\n");
 154         mdelay(panel->pup_delay);
 155         lcdhw->clkc_enable = LCD_CORECLKEN | LCD_LIDDCLKEN | LCD_DMACLKEN;
 156         lcdhw->raster_ctrl = 0;
 157         lcdhw->ctrl = LCD_CLK_DIVISOR(panel->pxl_clk_div) | LCD_RASTER_MODE;
 158         lcdhw->lcddma_fb0_base = gd->fb_base;
 159         lcdhw->lcddma_fb0_ceiling = gd->fb_base + FBSIZE(panel);
 160         lcdhw->lcddma_fb1_base = gd->fb_base;
 161         lcdhw->lcddma_fb1_ceiling = gd->fb_base + FBSIZE(panel);
 162         lcdhw->lcddma_ctrl = LCD_DMA_BURST_SIZE(LCD_DMA_BURST_16);
 163
 164         lcdhw->raster_timing0 = LCD_HORLSB(panel->hactive) |
 165                                 LCD_HORMSB(panel->hactive) |
 166                                 LCD_HFPLSB(panel->hfp) |
 167                                 LCD_HBPLSB(panel->hbp) |
 168                                 LCD_HSWLSB(panel->hsw);
 169         lcdhw->raster_timing1 = LCD_VBP(panel->vbp) |
 170                                 LCD_VFP(panel->vfp) |
 171                                 LCD_VSW(panel->vsw) |
 172                                 LCD_VERLSB(panel->vactive);
 173         lcdhw->raster_timing2 = LCD_HSWMSB(panel->hsw) |
 174                                 LCD_VERMSB(panel->vactive) |
 175                                 LCD_INVMASK(panel->pol) |
 176                                 LCD_HBPMSB(panel->hbp) |
 177                                 LCD_HFPMSB(panel->hfp) |
 178                                 0x0000FF00;     /* clk cycles for ac-bias */
 179         lcdhw->raster_ctrl =    raster_ctrl |
 180                                 LCD_PALMODE_RAWDATA |
 181                                 LCD_TFT_MODE |
 182                                 LCD_RASTER_ENABLE;
 183
 184         debug("am335x-fb: waiting picture to be stable.\n.");
 185         mdelay(panel->pon_delay);
 186
 187         return 0;
 188 }