uboot/drivers/video/am335x-fb.c
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   1// SPDX-License-Identifier: GPL-2.0+
   2/*
   3 * Copyright (C) 2013-2018 Hannes Schmelzer <oe5hpm@oevsv.at>
   4 * B&R Industrial Automation GmbH - http://www.br-automation.com
   5 *
   6 * minimal framebuffer driver for TI's AM335x SoC to be compatible with
   7 * Wolfgang Denk's LCD-Framework (CONFIG_LCD, common/lcd.c)
   8 *
   9 * - supporting 16/24/32bit RGB/TFT raster Mode (not using palette)
  10 * - sets up LCD controller as in 'am335x_lcdpanel' struct given
  11 * - starts output DMA from gd->fb_base buffer
  12 */
  13#include <common.h>
  14#include <asm/io.h>
  15#include <asm/arch/hardware.h>
  16#include <asm/arch/omap.h>
  17#include <asm/arch/clock.h>
  18#include <asm/arch/sys_proto.h>
  19#include <lcd.h>
  20#include "am335x-fb.h"
  21
  22#if !defined(LCD_CNTL_BASE)
  23#error "hw-base address of LCD-Controller (LCD_CNTL_BASE) not defined!"
  24#endif
  25
  26#define LCDC_FMAX                               200000000
  27
  28/* LCD Control Register */
  29#define LCD_CLK_DIVISOR(x)                      ((x) << 8)
  30#define LCD_RASTER_MODE                         0x01
  31/* LCD Clock Enable Register */
  32#define LCD_CORECLKEN                           (0x01 << 0)
  33#define LCD_LIDDCLKEN                           (0x01 << 1)
  34#define LCD_DMACLKEN                            (0x01 << 2)
  35/* LCD DMA Control Register */
  36#define LCD_DMA_BURST_SIZE(x)                   ((x) << 4)
  37#define LCD_DMA_BURST_1                         0x0
  38#define LCD_DMA_BURST_2                         0x1
  39#define LCD_DMA_BURST_4                         0x2
  40#define LCD_DMA_BURST_8                         0x3
  41#define LCD_DMA_BURST_16                        0x4
  42/* LCD Timing_0 Register */
  43#define LCD_HBPLSB(x)                           ((((x)-1) & 0xFF) << 24)
  44#define LCD_HFPLSB(x)                           ((((x)-1) & 0xFF) << 16)
  45#define LCD_HSWLSB(x)                           ((((x)-1) & 0x3F) << 10)
  46#define LCD_HORLSB(x)                           (((((x) >> 4)-1) & 0x3F) << 4)
  47#define LCD_HORMSB(x)                           (((((x) >> 4)-1) & 0x40) >> 4)
  48/* LCD Timing_1 Register */
  49#define LCD_VBP(x)                              ((x) << 24)
  50#define LCD_VFP(x)                              ((x) << 16)
  51#define LCD_VSW(x)                              (((x)-1) << 10)
  52#define LCD_VERLSB(x)                           (((x)-1) & 0x3FF)
  53/* LCD Timing_2 Register */
  54#define LCD_HSWMSB(x)                           ((((x)-1) & 0x3C0) << 21)
  55#define LCD_VERMSB(x)                           ((((x)-1) & 0x400) << 16)
  56#define LCD_HBPMSB(x)                           ((((x)-1) & 0x300) >> 4)
  57#define LCD_HFPMSB(x)                           ((((x)-1) & 0x300) >> 8)
  58#define LCD_INVMASK(x)                          ((x) & 0x3F00000)
  59/* LCD Raster Ctrl Register */
  60#define LCD_TFT_24BPP_MODE                      (1 << 25)
  61#define LCD_TFT_24BPP_UNPACK                    (1 << 26)
  62#define LCD_PALMODE_RAWDATA                     (0x02 << 20)
  63#define LCD_TFT_MODE                            (0x01 << 7)
  64#define LCD_RASTER_ENABLE                       (0x01 << 0)
  65
  66
  67/* Macro definitions */
  68#define FBSIZE(x)       ((x->hactive * x->vactive * x->bpp) >> 3)
  69
  70struct am335x_lcdhw {
  71        unsigned int            pid;                    /* 0x00 */
  72        unsigned int            ctrl;                   /* 0x04 */
  73        unsigned int            gap0;                   /* 0x08 */
  74        unsigned int            lidd_ctrl;              /* 0x0C */
  75        unsigned int            lidd_cs0_conf;          /* 0x10 */
  76        unsigned int            lidd_cs0_addr;          /* 0x14 */
  77        unsigned int            lidd_cs0_data;          /* 0x18 */
  78        unsigned int            lidd_cs1_conf;          /* 0x1C */
  79        unsigned int            lidd_cs1_addr;          /* 0x20 */
  80        unsigned int            lidd_cs1_data;          /* 0x24 */
  81        unsigned int            raster_ctrl;            /* 0x28 */
  82        unsigned int            raster_timing0;         /* 0x2C */
  83        unsigned int            raster_timing1;         /* 0x30 */
  84        unsigned int            raster_timing2;         /* 0x34 */
  85        unsigned int            raster_subpanel;        /* 0x38 */
  86        unsigned int            raster_subpanel2;       /* 0x3C */
  87        unsigned int            lcddma_ctrl;            /* 0x40 */
  88        unsigned int            lcddma_fb0_base;        /* 0x44 */
  89        unsigned int            lcddma_fb0_ceiling;     /* 0x48 */
  90        unsigned int            lcddma_fb1_base;        /* 0x4C */
  91        unsigned int            lcddma_fb1_ceiling;     /* 0x50 */
  92        unsigned int            sysconfig;              /* 0x54 */
  93        unsigned int            irqstatus_raw;          /* 0x58 */
  94        unsigned int            irqstatus;              /* 0x5C */
  95        unsigned int            irqenable_set;          /* 0x60 */
  96        unsigned int            irqenable_clear;        /* 0x64 */
  97        unsigned int            gap1;                   /* 0x68 */
  98        unsigned int            clkc_enable;            /* 0x6C */
  99        unsigned int            clkc_reset;             /* 0x70 */
 100};
 101
 102static struct am335x_lcdhw *lcdhw = (void *)LCD_CNTL_BASE;
 103
 104DECLARE_GLOBAL_DATA_PTR;
 105
 106int lcd_get_size(int *line_length)
 107{
 108        *line_length = (panel_info.vl_col * NBITS(panel_info.vl_bpix)) / 8;
 109        return *line_length * panel_info.vl_row + 0x20;
 110}
 111
 112int am335xfb_init(struct am335x_lcdpanel *panel)
 113{
 114        u32 raster_ctrl = 0;
 115
 116        struct cm_dpll *const cmdpll = (struct cm_dpll *)CM_DPLL;
 117        struct dpll_params dpll_disp = { 1, 0, 1, -1, -1, -1, -1 };
 118        unsigned int m, n, d, best_d = 2;
 119        int err = 0, err_r = 0;
 120
 121        if (gd->fb_base == 0) {
 122                printf("ERROR: no valid fb_base stored in GLOBAL_DATA_PTR!\n");
 123                return -1;
 124        }
 125        if (panel == NULL) {
 126                printf("ERROR: missing ptr to am335x_lcdpanel!\n");
 127                return -1;
 128        }
 129
 130        /* We can already set the bits for the raster_ctrl in this check */
 131        switch (panel->bpp) {
 132        case 16:
 133                break;
 134        case 32:
 135                raster_ctrl |= LCD_TFT_24BPP_UNPACK;
 136                /* fallthrough */
 137        case 24:
 138                raster_ctrl |= LCD_TFT_24BPP_MODE;
 139                break;
 140        default:
 141                pr_err("am335x-fb: invalid bpp value: %d\n", panel->bpp);
 142                return -1;
 143        }
 144
 145        /* check given clock-frequency */
 146        if (panel->pxl_clk > (LCDC_FMAX / 2)) {
 147                pr_err("am335x-fb: requested pxl-clk: %d not supported!\n",
 148                       panel->pxl_clk);
 149                return -1;
 150        }
 151
 152        debug("setting up LCD-Controller for %dx%dx%d (hfp=%d,hbp=%d,hsw=%d / ",
 153              panel->hactive, panel->vactive, panel->bpp,
 154              panel->hfp, panel->hbp, panel->hsw);
 155        debug("vfp=%d,vbp=%d,vsw=%d / clk=%d)\n",
 156              panel->vfp, panel->vfp, panel->vsw, panel->pxl_clk);
 157        debug("using frambuffer at 0x%08x with size %d.\n",
 158              (unsigned int)gd->fb_base, FBSIZE(panel));
 159
 160        /* setup display pll for requested clock frequency */
 161        err = panel->pxl_clk;
 162        err_r = err;
 163
 164        for (d = 2; d < 255; d++) {
 165                for (m = 2; m < 2047; m++) {
 166                        if ((V_OSCK * m) < (panel->pxl_clk * d))
 167                                continue;
 168                        n = (V_OSCK * m) / (panel->pxl_clk * d);
 169                        if (n > 127)
 170                                break;
 171                        if (((V_OSCK * m) / n) > LCDC_FMAX)
 172                                break;
 173
 174                        err = abs((V_OSCK * m) / n / d - panel->pxl_clk);
 175                        if (err < err_r) {
 176                                err_r = err;
 177                                dpll_disp.m = m;
 178                                dpll_disp.n = n;
 179                                best_d = d;
 180                        }
 181                }
 182        }
 183        debug("%s: PLL: best error %d Hz (M %d, N %d, DISP %d)\n",
 184              __func__, err_r, dpll_disp.m, dpll_disp.n, best_d);
 185        do_setup_dpll(&dpll_disp_regs, &dpll_disp);
 186
 187        /* clock source for LCDC from dispPLL M2 */
 188        writel(0x0, &cmdpll->clklcdcpixelclk);
 189
 190        /* palette default entry */
 191        memset((void *)gd->fb_base, 0, 0x20);
 192        *(unsigned int *)gd->fb_base = 0x4000;
 193        /* point fb behind palette */
 194        gd->fb_base += 0x20;
 195
 196        /* turn ON display through powercontrol function if accessible */
 197        if (panel->panel_power_ctrl != NULL)
 198                panel->panel_power_ctrl(1);
 199
 200        debug("am335x-fb: wait for stable power ...\n");
 201        mdelay(panel->pup_delay);
 202        lcdhw->clkc_enable = LCD_CORECLKEN | LCD_LIDDCLKEN | LCD_DMACLKEN;
 203        lcdhw->raster_ctrl = 0;
 204        lcdhw->ctrl = LCD_CLK_DIVISOR(best_d) | LCD_RASTER_MODE;
 205        lcdhw->lcddma_fb0_base = gd->fb_base;
 206        lcdhw->lcddma_fb0_ceiling = gd->fb_base + FBSIZE(panel);
 207        lcdhw->lcddma_fb1_base = gd->fb_base;
 208        lcdhw->lcddma_fb1_ceiling = gd->fb_base + FBSIZE(panel);
 209        lcdhw->lcddma_ctrl = LCD_DMA_BURST_SIZE(LCD_DMA_BURST_16);
 210
 211        lcdhw->raster_timing0 = LCD_HORLSB(panel->hactive) |
 212                                LCD_HORMSB(panel->hactive) |
 213                                LCD_HFPLSB(panel->hfp) |
 214                                LCD_HBPLSB(panel->hbp) |
 215                                LCD_HSWLSB(panel->hsw);
 216        lcdhw->raster_timing1 = LCD_VBP(panel->vbp) |
 217                                LCD_VFP(panel->vfp) |
 218                                LCD_VSW(panel->vsw) |
 219                                LCD_VERLSB(panel->vactive);
 220        lcdhw->raster_timing2 = LCD_HSWMSB(panel->hsw) |
 221                                LCD_VERMSB(panel->vactive) |
 222                                LCD_INVMASK(panel->pol) |
 223                                LCD_HBPMSB(panel->hbp) |
 224                                LCD_HFPMSB(panel->hfp) |
 225                                0x0000FF00;     /* clk cycles for ac-bias */
 226        lcdhw->raster_ctrl =    raster_ctrl |
 227                                LCD_PALMODE_RAWDATA |
 228                                LCD_TFT_MODE |
 229                                LCD_RASTER_ENABLE;
 230
 231        debug("am335x-fb: waiting picture to be stable.\n.");
 232        mdelay(panel->pon_delay);
 233
 234        return 0;
 235}
 236
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