[U-Boot] [PATCH 3/4] arm: mxs: Add MXS LCDIF driver

Marek Vasut marex at denx.de
Sun Apr 28 21:20:03 CEST 2013 

Add basic LCD driver for i.MX233 and i.MX28. This driver allows framebuffer
console and framebuffer logo.

Signed-off-by: Marek Vasut <marex at denx.de>
Cc: Anatolij Gustschin <agust at denx.de>
Cc: Fabio Estevam <fabio.estevam at freescale.com>
Cc: Otavio Salvador <otavio at ossystems.com.br>
Cc: Stefano Babic <sbabic at denx.de>
---
 drivers/video/Makefile      |    1 +
 drivers/video/cfb_console.c |    4 +
 drivers/video/mxsfb.c       |  189 +++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 194 insertions(+)
 create mode 100644 drivers/video/mxsfb.c

diff --git a/drivers/video/Makefile b/drivers/video/Makefile
index 53952ab..68ff34b 100644
--- a/drivers/video/Makefile
+++ b/drivers/video/Makefile
@@ -49,6 +49,7 @@ COBJS-$(CONFIG_VIDEO_MB862xx) += mb862xx.o videomodes.o
 COBJS-$(CONFIG_VIDEO_MB86R0xGDC) += mb86r0xgdc.o videomodes.o
 COBJS-$(CONFIG_VIDEO_MX3) += mx3fb.o videomodes.o
 COBJS-$(CONFIG_VIDEO_IPUV3) += mxc_ipuv3_fb.o ipu_common.o ipu_disp.o
+COBJS-$(CONFIG_VIDEO_MXS) += mxsfb.o videomodes.o
 COBJS-$(CONFIG_VIDEO_OMAP3) += omap3_dss.o
 COBJS-$(CONFIG_VIDEO_SED13806) += sed13806.o
 COBJS-$(CONFIG_VIDEO_SM501) += sm501.o
diff --git a/drivers/video/cfb_console.c b/drivers/video/cfb_console.c
index 61e1058..0793f07 100644
--- a/drivers/video/cfb_console.c
+++ b/drivers/video/cfb_console.c
@@ -151,6 +151,10 @@
 #endif
 #endif
 
+#ifdef CONFIG_VIDEO_MXS
+#define VIDEO_FB_16BPP_WORD_SWAP
+#endif
+
 /*
  * Defines for the MB862xx driver
  */
diff --git a/drivers/video/mxsfb.c b/drivers/video/mxsfb.c
new file mode 100644
index 0000000..461ff6e
--- /dev/null
+++ b/drivers/video/mxsfb.c
@@ -0,0 +1,189 @@
+/*
+ * Freescale i.MX23/i.MX28 LCDIF driver
+ *
+ * Copyright (C) 2011-2013 Marek Vasut <marex at denx.de>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; either version 2 of
+ * the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
+ * MA 02111-1307 USA
+ */
+#include <common.h>
+#include <malloc.h>
+#include <video_fb.h>
+
+#include <asm/arch/imx-regs.h>
+#include <asm/arch/clock.h>
+#include <asm/arch/sys_proto.h>
+#include <asm/errno.h>
+#include <asm/io.h>
+
+#include "videomodes.h"
+
+#define	PS2KHZ(ps)	(1000000000UL / (ps))
+
+static GraphicDevice panel;
+
+/*
+ * DENX M28EVK:
+ * setenv videomode
+ * video=ctfb:x:800,y:480,depth:18,mode:0,pclk:30066,
+ *       le:0,ri:256,up:0,lo:45,hs:1,vs:1,sync:100663296,vmode:0
+ */
+
+static void mxs_lcd_init(GraphicDevice *panel,
+			struct ctfb_res_modes *mode, int bpp)
+{
+	struct mxs_lcdif_regs *regs = (struct mxs_lcdif_regs *)MXS_LCDIF_BASE;
+	uint32_t word_len = 0, bus_width = 0;
+	uint8_t valid_data = 0;
+
+	/* Kick in the LCDIF clock */
+	mxs_set_lcdclk(PS2KHZ(mode->pixclock));
+
+	/* Restart the LCDIF block */
+	mxs_reset_block(&regs->hw_lcdif_ctrl_reg);
+
+	switch (bpp) {
+	case 24:
+		word_len = LCDIF_CTRL_WORD_LENGTH_24BIT;
+		bus_width = LCDIF_CTRL_LCD_DATABUS_WIDTH_24BIT;
+		valid_data = 0x7;
+		break;
+	case 18:
+		word_len = LCDIF_CTRL_WORD_LENGTH_24BIT;
+		bus_width = LCDIF_CTRL_LCD_DATABUS_WIDTH_18BIT;
+		valid_data = 0x7;
+		break;
+	case 16:
+		word_len = LCDIF_CTRL_WORD_LENGTH_16BIT;
+		bus_width = LCDIF_CTRL_LCD_DATABUS_WIDTH_16BIT;
+		valid_data = 0xf;
+		break;
+	case 8:
+		word_len = LCDIF_CTRL_WORD_LENGTH_8BIT;
+		bus_width = LCDIF_CTRL_LCD_DATABUS_WIDTH_8BIT;
+		valid_data = 0xf;
+		break;
+	}
+
+	writel(bus_width | word_len | LCDIF_CTRL_DOTCLK_MODE |
+		LCDIF_CTRL_BYPASS_COUNT | LCDIF_CTRL_LCDIF_MASTER,
+		&regs->hw_lcdif_ctrl);
+
+	writel(valid_data << LCDIF_CTRL1_BYTE_PACKING_FORMAT_OFFSET,
+		&regs->hw_lcdif_ctrl1);
+	writel((mode->yres << LCDIF_TRANSFER_COUNT_V_COUNT_OFFSET) | mode->xres,
+		&regs->hw_lcdif_transfer_count);
+
+	writel(LCDIF_VDCTRL0_ENABLE_PRESENT | LCDIF_VDCTRL0_ENABLE_POL |
+		LCDIF_VDCTRL0_VSYNC_PERIOD_UNIT |
+		LCDIF_VDCTRL0_VSYNC_PULSE_WIDTH_UNIT |
+		mode->vsync_len, &regs->hw_lcdif_vdctrl0);
+	writel(mode->upper_margin + mode->lower_margin +
+		mode->vsync_len + mode->yres,
+		&regs->hw_lcdif_vdctrl1);
+	writel((mode->hsync_len << LCDIF_VDCTRL2_HSYNC_PULSE_WIDTH_OFFSET) |
+		(mode->left_margin + mode->right_margin +
+		mode->hsync_len + mode->xres),
+		&regs->hw_lcdif_vdctrl2);
+	writel(((mode->left_margin + mode->hsync_len) <<
+		LCDIF_VDCTRL3_HORIZONTAL_WAIT_CNT_OFFSET) |
+		(mode->upper_margin + mode->vsync_len),
+		&regs->hw_lcdif_vdctrl3);
+	writel((0 << LCDIF_VDCTRL4_DOTCLK_DLY_SEL_OFFSET) | mode->xres,
+		&regs->hw_lcdif_vdctrl4);
+
+	writel(panel->frameAdrs, &regs->hw_lcdif_cur_buf);
+	writel(panel->frameAdrs, &regs->hw_lcdif_next_buf);
+
+	/* Flush FIFO first */
+	writel(LCDIF_CTRL1_FIFO_CLEAR, &regs->hw_lcdif_ctrl1_set);
+
+	/* Sync signals ON */
+	setbits_le32(&regs->hw_lcdif_vdctrl4, LCDIF_VDCTRL4_SYNC_SIGNALS_ON);
+
+	/* FIFO cleared */
+	writel(LCDIF_CTRL1_FIFO_CLEAR, &regs->hw_lcdif_ctrl1_clr);
+
+	/* RUN! */
+	writel(LCDIF_CTRL_RUN, &regs->hw_lcdif_ctrl_set);
+}
+
+void *video_hw_init(void)
+{
+	int bpp = -1;
+	char *penv;
+	void *fb;
+	struct ctfb_res_modes mode;
+
+	puts("Video: ");
+
+	/* Suck display configuration from "videomode" variable */
+	penv = getenv("videomode");
+	if (!penv) {
+		printf("MXSFB: 'videomode' variable not set!");
+		return NULL;
+	}
+
+	bpp = video_get_params(&mode, penv);
+
+	/* fill in Graphic device struct */
+	sprintf(panel.modeIdent, "%dx%dx%d",
+			mode.xres, mode.yres, bpp);
+
+	panel.winSizeX = mode.xres;
+	panel.winSizeY = mode.yres;
+	panel.plnSizeX = mode.xres;
+	panel.plnSizeY = mode.yres;
+
+	switch (bpp) {
+	case 24:
+	case 18:
+		panel.gdfBytesPP = 4;
+		panel.gdfIndex = GDF_32BIT_X888RGB;
+		break;
+	case 16:
+		panel.gdfBytesPP = 2;
+		panel.gdfIndex = GDF_16BIT_565RGB;
+		break;
+	case 8:
+		panel.gdfBytesPP = 1;
+		panel.gdfIndex = GDF__8BIT_INDEX;
+		break;
+	default:
+		printf("MXSFB: Invalid BPP specified! (bpp = %i)\n", bpp);
+		return NULL;
+	}
+
+	panel.memSize = mode.xres * mode.yres * panel.gdfBytesPP;
+
+	/* Allocate framebuffer */
+	fb = malloc(panel.memSize);
+	if (!fb) {
+		printf("MXSFB: Error allocating framebuffer!\n");
+		return NULL;
+	}
+
+	/* Wipe framebuffer */
+	memset(fb, 0, panel.memSize);
+
+	panel.frameAdrs = (u32)fb;
+
+	printf("%s\n", panel.modeIdent);
+
+	/* Start framebuffer */
+	mxs_lcd_init(&panel, &mode, bpp);
+
+	return (void *)&panel;
+}
-- 
1.7.10.4

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