diff options
Diffstat (limited to 'drivers/video/am335x-fb.c')
| -rw-r--r-- | drivers/video/am335x-fb.c | 169 |
1 files changed, 169 insertions, 0 deletions
diff --git a/drivers/video/am335x-fb.c b/drivers/video/am335x-fb.c new file mode 100644 index 0000000..ab98941 --- /dev/null +++ b/drivers/video/am335x-fb.c @@ -0,0 +1,169 @@ +/* + * Copyright (C) 2013 Hannes Petermaier <oe5hpm@oevsv.at> + * 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 only 24bit 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 <common.h> +#include <asm/arch/hardware.h> +#include <lcd.h> +#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 (0x10 << 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) +{ + 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; + } + + 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; + + 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) + 0x20; + lcdhw->lcddma_fb1_base = gd->fb_base; + lcdhw->lcddma_fb1_ceiling = gd->fb_base + FBSIZE(panel) + 0x20; + 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 = LCD_TFT_24BPP_MODE | + LCD_TFT_24BPP_UNPACK | + LCD_PALMODE_RAWDATA | + LCD_TFT_MODE | + LCD_RASTER_ENABLE; + + gd->fb_base += 0x20; /* point fb behind palette */ + + /* turn ON display through powercontrol function if accessible */ + if (0 != panel->panel_power_ctrl) { + mdelay(panel->pon_delay); + panel->panel_power_ctrl(1); + } + + return 0; +} |