video: Add support for imx25 lcd controller

This patch adds support for the imx25 lcd display controller.

Signed-off-by: Thomas Diener <dietho@gmx.de>
Acked-by: Anatolij Gustschin <agust@denx.de>

1 files changed, 121 insertions, 0 deletions

diff --git a/drivers/video/imx25lcdc.c b/drivers/video/imx25lcdc.c
new file mode 100644
index 0000000..ef5767b
--- /dev/null
+++ b/drivers/video/imx25lcdc.c
@@ -0,0 +1,121 @@
+/*
+ * (C) Copyright 2011
+ * Matthias Weisser <weisserm@arcor.de>
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ *
+ * imx25lcdc.c - Graphic interface for i.MX25 lcd controller
+ */
+
+#include <common.h>
+
+#include <malloc.h>
+#include <asm/io.h>
+#include <asm/arch/imx-regs.h>
+#include <video_fb.h>
+#include "videomodes.h"
+
+/*
+ * 4MB (at the end of system RAM)
+ */
+#define VIDEO_MEM_SIZE		0x400000
+
+#define FB_SYNC_CLK_INV		(1<<16)	/* pixel clock inverted */
+
+/*
+ * Graphic Device
+ */
+static GraphicDevice imx25fb;
+
+void *video_hw_init(void)
+{
+	struct lcdc_regs *lcdc = (struct lcdc_regs *)IMX_LCDC_BASE;
+	struct ccm_regs *ccm = (struct ccm_regs *)IMX_CCM_BASE;
+	GraphicDevice *pGD = &imx25fb;
+	char *s;
+	u32 *videomem;
+
+	memset(pGD, 0, sizeof(GraphicDevice));
+
+	pGD->gdfIndex = GDF_16BIT_565RGB;
+	pGD->gdfBytesPP = 2;
+	pGD->memSize = VIDEO_MEM_SIZE;
+	pGD->frameAdrs = PHYS_SDRAM + PHYS_SDRAM_SIZE - VIDEO_MEM_SIZE;
+
+	videomem = (u32 *)pGD->frameAdrs;
+
+	s = getenv("videomode");
+	if (s != NULL) {
+		struct ctfb_res_modes var_mode;
+		u32 lsr, lpcr, lhcr, lvcr;
+		unsigned long div;
+		int bpp;
+
+		/* Disable all clocks of the LCDC */
+		writel(readl(&ccm->cgr0) & ~((1<<7) | (1<<24)), &ccm->cgr0);
+		writel(readl(&ccm->cgr1) & ~(1<<29), &ccm->cgr1);
+
+		bpp = video_get_params(&var_mode, s);
+
+		if (bpp == 0) {
+			var_mode.xres = 320;
+			var_mode.yres = 240;
+			var_mode.pixclock = 154000;
+			var_mode.left_margin = 68;
+			var_mode.right_margin = 20;
+			var_mode.upper_margin = 4;
+			var_mode.lower_margin = 18;
+			var_mode.hsync_len = 40;
+			var_mode.vsync_len = 6;
+			var_mode.sync = 0;
+			var_mode.vmode = 0;
+		}
+
+		/* Fill memory with white */
+		memset(videomem, 0xFF, var_mode.xres * var_mode.yres * 2);
+
+		imx25fb.winSizeX = var_mode.xres;
+		imx25fb.winSizeY = var_mode.yres;
+
+		/* LCD base clock is 66.6MHZ. We do calculations in kHz */
+		div = 66000 / (1000000000L / var_mode.pixclock);
+		if (div > 63)
+			div = 63;
+		if (0 == div)
+			div = 1;
+
+		lsr = ((var_mode.xres / 16) << 20) |
+			var_mode.yres;
+		lpcr =	(1 << 31) |
+			(1 << 30) |
+			(5 << 25) |
+			(1 << 23) |
+			(1 << 22) |
+			(1 << 19) |
+			(1 <<  7) |
+			div;
+		lhcr =	(var_mode.right_margin << 0) |
+			(var_mode.left_margin << 8) |
+			(var_mode.hsync_len << 26);
+
+		lvcr =	(var_mode.lower_margin << 0) |
+			(var_mode.upper_margin << 8) |
+			(var_mode.vsync_len << 26);
+
+		writel((uint32_t)videomem, &lcdc->lssar);
+		writel(lsr, &lcdc->lsr);
+		writel(var_mode.xres * 2 / 4, &lcdc->lvpwr);
+		writel(lpcr, &lcdc->lpcr);
+		writel(lhcr, &lcdc->lhcr);
+		writel(lvcr, &lcdc->lvcr);
+		writel(0x00040060, &lcdc->ldcr);
+
+		writel(0xA90300, &lcdc->lpccr);
+
+		/* Ensable all clocks of the LCDC */
+		writel(readl(&ccm->cgr0) | ((1<<7) | (1<<24)), &ccm->cgr0);
+		writel(readl(&ccm->cgr1) | (1<<29), &ccm->cgr1);
+	}
+
+	return pGD;
+}