video: mxsfb: add DM_VIDEO support

Extend the driver to build with DM_VIDEO enabled. DTS files
must additionally include 'u-boot,dm-pre-reloc' property in
soc and child nodes to enable driver binding to mxsfb device.

Signed-off-by: Igor Opaniuk <igor.opaniuk@toradex.com>

arch/arm/mach-imx/cpu.c

@@ -298,7 +298,7 @@ void arch_preboot_os(void)
 	/* disable video before launching O/S */
 	ipuv3_fb_shutdown();
 #endif
-#if defined(CONFIG_VIDEO_MXS)
+#if defined(CONFIG_VIDEO_MXS) && !defined(CONFIG_DM_VIDEO)
 	lcdif_power_down();
 #endif
 }

arch/arm/mach-imx/mx7/soc.c

@@ -369,7 +369,7 @@ void s_init(void)
 void reset_misc(void)
 {
 #ifndef CONFIG_SPL_BUILD
-#ifdef CONFIG_VIDEO_MXS
+#if defined(CONFIG_VIDEO_MXS) && !defined(CONFIG_DM_VIDEO)
 	lcdif_power_down();
 #endif
 #endif

drivers/video/mxsfb.c

@@ -5,8 +5,10 @@
  * Copyright (C) 2011-2013 Marek Vasut <marex@denx.de>
  */
 #include <common.h>
+#include <dm.h>
 #include <linux/errno.h>
 #include <malloc.h>
+#include <video.h>
 #include <video_fb.h>
 
 #include <asm/arch/clock.h>
@@ -18,8 +20,11 @@
 #include "videomodes.h"
 
 #define	PS2KHZ(ps)	(1000000000UL / (ps))
+#define HZ2PS(hz)	(1000000000UL / ((hz) / 1000))
+
+#define BITS_PP		18
+#define BYTES_PP	4
 
-static GraphicDevice panel;
 struct mxs_dma_desc desc;
 
 /**
@@ -128,10 +133,10 @@ static void mxs_lcd_init(u32 fb_addr, struct ctfb_res_modes *mode, int bpp)
 	writel(LCDIF_CTRL_RUN, &regs->hw_lcdif_ctrl_set);
 }
 
-static int mxs_probe_common(struct ctfb_res_modes *mode, int bpp, void *fb)
+static int mxs_probe_common(struct ctfb_res_modes *mode, int bpp, u32 fb)
 {
 	/* Start framebuffer */
-	mxs_lcd_init((u32)fb, mode, bpp);
+	mxs_lcd_init(fb, mode, bpp);
 
 #ifdef CONFIG_VIDEO_MXS_MODE_SYSTEM
 	/*
@@ -159,16 +164,16 @@ static int mxs_probe_common(struct ctfb_res_modes *mode, int bpp, void *fb)
 	return 0;
 }
 
-void lcdif_power_down(void)
+static int mxs_remove_common(u32 fb)
 {
 	struct mxs_lcdif_regs *regs = (struct mxs_lcdif_regs *)MXS_LCDIF_BASE;
 	int timeout = 1000000;
 
-	if (!panel.frameAdrs)
-		return;
+	if (!fb)
+		return -EINVAL;
 
-	writel(panel.frameAdrs, &regs->hw_lcdif_cur_buf_reg);
-	writel(panel.frameAdrs, &regs->hw_lcdif_next_buf_reg);
+	writel(fb, &regs->hw_lcdif_cur_buf_reg);
+	writel(fb, &regs->hw_lcdif_next_buf_reg);
 	writel(LCDIF_CTRL1_VSYNC_EDGE_IRQ, &regs->hw_lcdif_ctrl1_clr);
 	while (--timeout) {
 		if (readl(&regs->hw_lcdif_ctrl1_reg) &
@@ -177,6 +182,17 @@ void lcdif_power_down(void)
 		udelay(1);
 	}
 	mxs_reset_block((struct mxs_register_32 *)&regs->hw_lcdif_ctrl_reg);
+
+	return 0;
+}
+
+#ifndef CONFIG_DM_VIDEO
+
+static GraphicDevice panel;
+
+void lcdif_power_down(void)
+{
+	mxs_remove_common(panel.frameAdrs);
 }
 
 void *video_hw_init(void)
@@ -242,7 +258,7 @@ void *video_hw_init(void)
 
 	printf("%s\n", panel.modeIdent);
 
-	ret = mxs_probe_common(&mode, bpp, fb);
+	ret = mxs_probe_common(&mode, bpp, (u32)fb);
 	if (ret)
 		goto dealloc_fb;
 
@@ -253,3 +269,114 @@ dealloc_fb:
 
 	return NULL;
 }
+#else /* ifndef CONFIG_DM_VIDEO */
+
+static int mxs_video_probe(struct udevice *dev)
+{
+	struct video_uc_platdata *plat = dev_get_uclass_platdata(dev);
+	struct video_priv *uc_priv = dev_get_uclass_priv(dev);
+
+	struct ctfb_res_modes mode;
+	struct display_timing timings;
+	int bpp = -1;
+	u32 fb_start, fb_end;
+	int ret;
+
+	debug("%s() plat: base 0x%lx, size 0x%x\n",
+	       __func__, plat->base, plat->size);
+
+	ret = ofnode_decode_display_timing(dev_ofnode(dev), 0, &timings);
+	if (ret) {
+		dev_err(dev, "failed to get any display timings\n");
+		return -EINVAL;
+	}
+
+	mode.xres = timings.hactive.typ;
+	mode.yres = timings.vactive.typ;
+	mode.left_margin = timings.hback_porch.typ;
+	mode.right_margin = timings.hfront_porch.typ;
+	mode.upper_margin = timings.vback_porch.typ;
+	mode.lower_margin = timings.vfront_porch.typ;
+	mode.hsync_len = timings.hsync_len.typ;
+	mode.vsync_len = timings.vsync_len.typ;
+	mode.pixclock = HZ2PS(timings.pixelclock.typ);
+
+	bpp = BITS_PP;
+
+	ret = mxs_probe_common(&mode, bpp, plat->base);
+	if (ret)
+		return ret;
+
+	switch (bpp) {
+	case 24:
+	case 18:
+		uc_priv->bpix = VIDEO_BPP32;
+		break;
+	case 16:
+		uc_priv->bpix = VIDEO_BPP16;
+		break;
+	case 8:
+		uc_priv->bpix = VIDEO_BPP8;
+		break;
+	default:
+		dev_err(dev, "invalid bpp specified (bpp = %i)\n", bpp);
+		return -EINVAL;
+	}
+
+	uc_priv->xsize = mode.xres;
+	uc_priv->ysize = mode.yres;
+
+	/* Enable dcache for the frame buffer */
+	fb_start = plat->base & ~(MMU_SECTION_SIZE - 1);
+	fb_end = plat->base + plat->size;
+	fb_end = ALIGN(fb_end, 1 << MMU_SECTION_SHIFT);
+	mmu_set_region_dcache_behaviour(fb_start, fb_end - fb_start,
+					DCACHE_WRITEBACK);
+	video_set_flush_dcache(dev, true);
+
+	return ret;
+}
+
+static int mxs_video_bind(struct udevice *dev)
+{
+	struct video_uc_platdata *plat = dev_get_uclass_platdata(dev);
+	struct display_timing timings;
+	int ret;
+
+	ret = ofnode_decode_display_timing(dev_ofnode(dev), 0, &timings);
+	if (ret) {
+		dev_err(dev, "failed to get any display timings\n");
+		return -EINVAL;
+	}
+
+	plat->size = timings.hactive.typ * timings.vactive.typ * BYTES_PP;
+
+	return 0;
+}
+
+static int mxs_video_remove(struct udevice *dev)
+{
+	struct video_uc_platdata *plat = dev_get_uclass_platdata(dev);
+
+	mxs_remove_common(plat->base);
+
+	return 0;
+}
+
+static const struct udevice_id mxs_video_ids[] = {
+	{ .compatible = "fsl,imx23-lcdif" },
+	{ .compatible = "fsl,imx28-lcdif" },
+	{ .compatible = "fsl,imx7ulp-lcdif" },
+	{ /* sentinel */ }
+};
+
+U_BOOT_DRIVER(mxs_video) = {
+	.name	= "mxs_video",
+	.id	= UCLASS_VIDEO,
+	.of_match = mxs_video_ids,
+	.bind	= mxs_video_bind,
+	.probe	= mxs_video_probe,
+	.remove = mxs_video_remove,
+	.flags	= DM_FLAG_PRE_RELOC,
+};
+#endif /* ifndef CONFIG_DM_VIDEO */

include/configs/colibri_imx7.h

@@ -225,7 +225,7 @@
 #define CONFIG_SYS_DFU_DATA_BUF_SIZE	SZ_16M
 #define DFU_DEFAULT_POLL_TIMEOUT	300
 
-#ifdef CONFIG_VIDEO
+#if defined(CONFIG_VIDEO) || defined(CONFIG_DM_VIDEO)
 #define CONFIG_VIDEO_MXS
 #define CONFIG_VIDEO_LOGO
 #define CONFIG_SPLASH_SCREEN