/* * Copyright (C) 2013 Hannes Schmelzer * Bernecker & Rainer Industrieelektronik GmbH - http://www.br-automation.com * * minimal framebuffer driver for TI's AM335x SoC to be compatible with * Wolfgang Denk's LCD-Framework (CONFIG_LCD, common/lcd.c) * * - supporting 16/24/32bit RGB/TFT raster Mode (not using palette) * - sets up LCD controller as in 'am335x_lcdpanel' struct given * - starts output DMA from gd->fb_base buffer * * SPDX-License-Identifier: GPL-2.0+ */ #include #include #include #include "am335x-fb.h" #if !defined(LCD_CNTL_BASE) #error "hw-base address of LCD-Controller (LCD_CNTL_BASE) not defined!" #endif /* LCD Control Register */ #define LCD_CLK_DIVISOR(x) ((x) << 8) #define LCD_RASTER_MODE 0x01 /* LCD Clock Enable Register */ #define LCD_CORECLKEN (0x01 << 0) #define LCD_LIDDCLKEN (0x01 << 1) #define LCD_DMACLKEN (0x01 << 2) /* LCD DMA Control Register */ #define LCD_DMA_BURST_SIZE(x) ((x) << 4) #define LCD_DMA_BURST_1 0x0 #define LCD_DMA_BURST_2 0x1 #define LCD_DMA_BURST_4 0x2 #define LCD_DMA_BURST_8 0x3 #define LCD_DMA_BURST_16 0x4 /* LCD Timing_0 Register */ #define LCD_HBPLSB(x) ((((x)-1) & 0xFF) << 24) #define LCD_HFPLSB(x) ((((x)-1) & 0xFF) << 16) #define LCD_HSWLSB(x) ((((x)-1) & 0x3F) << 10) #define LCD_HORLSB(x) (((((x) >> 4)-1) & 0x3F) << 4) #define LCD_HORMSB(x) (((((x) >> 4)-1) & 0x40) >> 4) /* LCD Timing_1 Register */ #define LCD_VBP(x) ((x) << 24) #define LCD_VFP(x) ((x) << 16) #define LCD_VSW(x) (((x)-1) << 10) #define LCD_VERLSB(x) (((x)-1) & 0x3FF) /* LCD Timing_2 Register */ #define LCD_HSWMSB(x) ((((x)-1) & 0x3C0) << 21) #define LCD_VERMSB(x) ((((x)-1) & 0x400) << 16) #define LCD_HBPMSB(x) ((((x)-1) & 0x300) >> 4) #define LCD_HFPMSB(x) ((((x)-1) & 0x300) >> 8) #define LCD_INVMASK(x) ((x) & 0x3F00000) /* LCD Raster Ctrl Register */ #define LCD_TFT_24BPP_MODE (1 << 25) #define LCD_TFT_24BPP_UNPACK (1 << 26) #define LCD_PALMODE_RAWDATA (0x02 << 20) #define LCD_TFT_MODE (0x01 << 7) #define LCD_RASTER_ENABLE (0x01 << 0) /* Macro definitions */ #define FBSIZE(x) ((x->hactive * x->vactive * x->bpp) >> 3) struct am335x_lcdhw { unsigned int pid; /* 0x00 */ unsigned int ctrl; /* 0x04 */ unsigned int gap0; /* 0x08 */ unsigned int lidd_ctrl; /* 0x0C */ unsigned int lidd_cs0_conf; /* 0x10 */ unsigned int lidd_cs0_addr; /* 0x14 */ unsigned int lidd_cs0_data; /* 0x18 */ unsigned int lidd_cs1_conf; /* 0x1C */ unsigned int lidd_cs1_addr; /* 0x20 */ unsigned int lidd_cs1_data; /* 0x24 */ unsigned int raster_ctrl; /* 0x28 */ unsigned int raster_timing0; /* 0x2C */ unsigned int raster_timing1; /* 0x30 */ unsigned int raster_timing2; /* 0x34 */ unsigned int raster_subpanel; /* 0x38 */ unsigned int raster_subpanel2; /* 0x3C */ unsigned int lcddma_ctrl; /* 0x40 */ unsigned int lcddma_fb0_base; /* 0x44 */ unsigned int lcddma_fb0_ceiling; /* 0x48 */ unsigned int lcddma_fb1_base; /* 0x4C */ unsigned int lcddma_fb1_ceiling; /* 0x50 */ unsigned int sysconfig; /* 0x54 */ unsigned int irqstatus_raw; /* 0x58 */ unsigned int irqstatus; /* 0x5C */ unsigned int irqenable_set; /* 0x60 */ unsigned int irqenable_clear; /* 0x64 */ unsigned int gap1; /* 0x68 */ unsigned int clkc_enable; /* 0x6C */ unsigned int clkc_reset; /* 0x70 */ }; static struct am335x_lcdhw *lcdhw = (void *)LCD_CNTL_BASE; DECLARE_GLOBAL_DATA_PTR; int lcd_get_size(int *line_length) { *line_length = (panel_info.vl_col * NBITS(panel_info.vl_bpix)) / 8; return *line_length * panel_info.vl_row + 0x20; } int am335xfb_init(struct am335x_lcdpanel *panel) { u32 raster_ctrl = 0; if (0 == gd->fb_base) { printf("ERROR: no valid fb_base stored in GLOBAL_DATA_PTR!\n"); return -1; } if (0 == panel) { printf("ERROR: missing ptr to am335x_lcdpanel!\n"); return -1; } /* We can already set the bits for the raster_ctrl in this check */ switch (panel->bpp) { case 16: break; case 32: raster_ctrl |= LCD_TFT_24BPP_UNPACK; /* fallthrough */ case 24: raster_ctrl |= LCD_TFT_24BPP_MODE; break; default: error("am335x-fb: invalid bpp value: %d\n", panel->bpp); return -1; } debug("setting up LCD-Controller for %dx%dx%d (hfp=%d,hbp=%d,hsw=%d / ", panel->hactive, panel->vactive, panel->bpp, panel->hfp, panel->hbp, panel->hsw); debug("vfp=%d,vbp=%d,vsw=%d / clk-div=%d)\n", panel->vfp, panel->vfp, panel->vsw, panel->pxl_clk_div); debug("using frambuffer at 0x%08x with size %d.\n", (unsigned int)gd->fb_base, FBSIZE(panel)); /* palette default entry */ memset((void *)gd->fb_base, 0, 0x20); *(unsigned int *)gd->fb_base = 0x4000; /* point fb behind palette */ gd->fb_base += 0x20; /* turn ON display through powercontrol function if accessible */ if (0 != panel->panel_power_ctrl) panel->panel_power_ctrl(1); debug("am335x-fb: wait for stable power ...\n"); mdelay(panel->pup_delay); lcdhw->clkc_enable = LCD_CORECLKEN | LCD_LIDDCLKEN | LCD_DMACLKEN; lcdhw->raster_ctrl = 0; lcdhw->ctrl = LCD_CLK_DIVISOR(panel->pxl_clk_div) | LCD_RASTER_MODE; lcdhw->lcddma_fb0_base = gd->fb_base; lcdhw->lcddma_fb0_ceiling = gd->fb_base + FBSIZE(panel); lcdhw->lcddma_fb1_base = gd->fb_base; lcdhw->lcddma_fb1_ceiling = gd->fb_base + FBSIZE(panel); lcdhw->lcddma_ctrl = LCD_DMA_BURST_SIZE(LCD_DMA_BURST_16); lcdhw->raster_timing0 = LCD_HORLSB(panel->hactive) | LCD_HORMSB(panel->hactive) | LCD_HFPLSB(panel->hfp) | LCD_HBPLSB(panel->hbp) | LCD_HSWLSB(panel->hsw); lcdhw->raster_timing1 = LCD_VBP(panel->vbp) | LCD_VFP(panel->vfp) | LCD_VSW(panel->vsw) | LCD_VERLSB(panel->vactive); lcdhw->raster_timing2 = LCD_HSWMSB(panel->hsw) | LCD_VERMSB(panel->vactive) | LCD_INVMASK(panel->pol) | LCD_HBPMSB(panel->hbp) | LCD_HFPMSB(panel->hfp) | 0x0000FF00; /* clk cycles for ac-bias */ lcdhw->raster_ctrl = raster_ctrl | LCD_PALMODE_RAWDATA | LCD_TFT_MODE | LCD_RASTER_ENABLE; debug("am335x-fb: waiting picture to be stable.\n."); mdelay(panel->pon_delay); return 0; }