[U-Boot] [PATCH] video: Add support for TI's AM335x LCD-Controller
Hannes Petermaier
oe5hpm at oevsv.at
Thu Mar 6 14:39:06 CET 2014
- 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 at oevsv.at>
---
drivers/video/Makefile | 1 +
drivers/video/am335x-fb.c | 169 +++++++++++++++++++++++++++++++++++++++++++++
drivers/video/am335x-fb.h | 67 ++++++++++++++++++
3 files changed, 237 insertions(+)
create mode 100644 drivers/video/am335x-fb.c
create mode 100644 drivers/video/am335x-fb.h
diff --git a/drivers/video/Makefile b/drivers/video/Makefile
index a7f5469..ac3d6c7 100644
--- a/drivers/video/Makefile
+++ b/drivers/video/Makefile
@@ -39,3 +39,4 @@ 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
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 at 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;
+}
diff --git a/drivers/video/am335x-fb.h b/drivers/video/am335x-fb.h
new file mode 100644
index 0000000..8a0b131
--- /dev/null
+++ b/drivers/video/am335x-fb.h
@@ -0,0 +1,67 @@
+/*
+ * Copyright (C) 2013 Hannes Petermaier <oe5hpm at 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 */
--
1.7.9.5
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