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video: Add support for TI's AM335x LCD-Controller

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- Adds support for a minimal framebuffer driver of TI's AM335x SoC
  to be compatible with Wolfgang Denk's LCD-Framework (CONFIG_LCD,
  common/lcd.c)

Signed-off-by: Hannes Petermaier <oe5hpm@oevsv.at>
master
Hannes Petermaier 11 years ago committed by Anatolij Gustschin
parent 8d9eaafdd1
commit 3c5fabd139
3 changed files with 237 additions and 0 deletions
  1. 1
      drivers/video/Makefile
  2. 169
      drivers/video/am335x-fb.c
  3. 67
      drivers/video/am335x-fb.h

1
drivers/video/Makefile
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@ -41,3 +41,4 @@ obj-$(CONFIG_VIDEO_SMI_LYNXEM) += smiLynxEM.o videomodes.o
obj-$(CONFIG_VIDEO_TEGRA) += tegra.o
obj-$(CONFIG_VIDEO_VCXK) += bus_vcxk.o
obj-$(CONFIG_FORMIKE) += formike.o
obj-$(CONFIG_AM335X_LCD) += am335x-fb.o

169
drivers/video/am335x-fb.c
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@ -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;
}

67
drivers/video/am335x-fb.h
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@ -0,0 +1,67 @@
/*
* Copyright (C) 2013 Hannes Petermaier <oe5hpm@oevsv.at> -
* Bernecker & Rainer Industrieelektronik GmbH - http://www.br-automation.com
*
* SPDX-License-Identifier: GPL-2.0+
*/
#ifndef AM335X_FB_H
#define AM335X_FB_H
#define HSVS_CONTROL (0x01 << 25) /*
* 0 = lcd_lp and lcd_fp are driven on
* opposite edges of pixel clock than
* the lcd_pixel_o
* 1 = lcd_lp and lcd_fp are driven
* according to bit 24 Note that this
* bit MUST be set to '0' for Passive
* Matrix displays the edge timing is
* fixed
*/
#define HSVS_RISEFALL (0x01 << 24) /*
* 0 = lcd_lp and lcd_fp are driven on
* the rising edge of pixel clock (bit
* 25 must be set to 1)
* 1 = lcd_lp and lcd_fp are driven on
* the falling edge of pixel clock (bit
* 25 must be set to 1)
*/
#define DE_INVERT (0x01 << 23) /*
* 0 = DE is low-active
* 1 = DE is high-active
*/
#define PXCLK_INVERT (0x01 << 22) /*
* 0 = pix-clk is high-active
* 1 = pic-clk is low-active
*/
#define HSYNC_INVERT (0x01 << 21) /*
* 0 = HSYNC is active high
* 1 = HSYNC is avtive low
*/
#define VSYNC_INVERT (0x01 << 20) /*
* 0 = VSYNC is active high
* 1 = VSYNC is active low
*/
struct am335x_lcdpanel {
unsigned int hactive; /* Horizontal active area */
unsigned int vactive; /* Vertical active area */
unsigned int bpp; /* bits per pixel */
unsigned int hfp; /* Horizontal front porch */
unsigned int hbp; /* Horizontal back porch */
unsigned int hsw; /* Horizontal Sync Pulse Width */
unsigned int vfp; /* Vertical front porch */
unsigned int vbp; /* Vertical back porch */
unsigned int vsw; /* Vertical Sync Pulse Width */
unsigned int pxl_clk_div; /* Pixel clock divider*/
unsigned int pol; /* polarity of sync, clock signals */
unsigned int pon_delay; /*
* time in ms for turning on lcd after
* initializing lcd-controller
*/
void (*panel_power_ctrl)(int); /* fp for power on/off display */
};
int am335xfb_init(struct am335x_lcdpanel *panel);
#endif /* AM335X_FB_H */
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