drivers/video/am335x-fb.c

   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
  70 struct 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
 102 static struct am335x_lcdhw *lcdhw = (void *)LCD_CNTL_BASE;
 103
 104 DECLARE_GLOBAL_DATA_PTR;
 105
 106 int 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
 112 int 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 }