sunxi: video: Add simplefb support

Add simplefb support, note this depends on the kernel having support for
the clocks property which has recently been added to the simplefb devicetree
binding.

Signed-off-by: Luc Verhaegen <libv@skynet.be>
[hdegoede@redhat.com: Use pre-populated simplefb node under /chosen as
 disussed on the devicetree list]
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Acked-by: Ian Campbell <ijc@hellion.org.uk&gt;.>

arch/arm/include/asm/arch-sunxi/display.h

@@ -182,4 +182,6 @@ struct sunxi_hdmi_reg {
 #define SUNXI_HDMI_PLL_DBG0_PLL3		(0 << 21)
 #define SUNXI_HDMI_PLL_DBG0_PLL7		(1 << 21)
 
+int sunxi_simplefb_setup(void *blob);
+
 #endif /* _SUNXI_DISPLAY_H */

board/sunxi/board.c

@@ -24,6 +24,7 @@
 #endif
 #include <asm/arch/clock.h>
 #include <asm/arch/cpu.h>
+#include <asm/arch/display.h>
 #include <asm/arch/dram.h>
 #include <asm/arch/gpio.h>
 #include <asm/arch/mmc.h>
@@ -237,3 +238,12 @@ int misc_init_r(void)
 	return 0;
 }
 #endif
+
+#ifdef CONFIG_OF_BOARD_SETUP
+int ft_board_setup(void *blob, bd_t *bd)
+{
+#ifdef CONFIG_VIDEO_DT_SIMPLEFB
+	return sunxi_simplefb_setup(blob);
+#endif
+}
+#endif /* CONFIG_OF_BOARD_SETUP */

drivers/video/sunxi_display.c

@@ -13,6 +13,8 @@
 #include <asm/arch/display.h>
 #include <asm/global_data.h>
 #include <asm/io.h>
+#include <fdtdec.h>
+#include <fdt_support.h>
 #include <linux/fb.h>
 #include <video_fb.h>
 
@@ -408,3 +410,42 @@ void *video_hw_init(void)
 
 	return graphic_device;
 }
+
+/*
+ * Simplefb support.
+ */
+#if defined(CONFIG_OF_BOARD_SETUP) && defined(CONFIG_VIDEO_DT_SIMPLEFB)
+int sunxi_simplefb_setup(void *blob)
+{
+	static GraphicDevice *graphic_device = &sunxi_display.graphic_device;
+	int offset, ret;
+
+	if (!sunxi_display.enabled)
+		return 0;
+
+	/* Find a framebuffer node, with pipeline == "de_be0-lcd0-hdmi" */
+	offset = fdt_node_offset_by_compatible(blob, -1,
+					       "allwinner,simple-framebuffer");
+	while (offset >= 0) {
+		ret = fdt_find_string(blob, offset, "allwinner,pipeline",
+				      "de_be0-lcd0-hdmi");
+		if (ret == 0)
+			break;
+		offset = fdt_node_offset_by_compatible(blob, offset,
+					       "allwinner,simple-framebuffer");
+	}
+	if (offset < 0) {
+		eprintf("Cannot setup simplefb: node not found\n");
+		return 0; /* Keep older kernels working */
+	}
+
+	ret = fdt_setup_simplefb_node(blob, offset, gd->fb_base,
+			graphic_device->winSizeX, graphic_device->winSizeY,
+			graphic_device->winSizeX * graphic_device->gdfBytesPP,
+			"x8r8g8b8");
+	if (ret)
+		eprintf("Cannot setup simplefb: Error setting properties\n");
+
+	return ret;
+}
+#endif /* CONFIG_OF_BOARD_SETUP && CONFIG_VIDEO_DT_SIMPLEFB */

include/configs/sunxi-common.h

@@ -204,6 +204,9 @@
  */
 #define CONFIG_SUNXI_FB_SIZE (8 << 20)
 
+/* Do we want to initialize a simple FB? */
+#define CONFIG_VIDEO_DT_SIMPLEFB
+
 #define CONFIG_VIDEO_SUNXI
 
 #define CONFIG_CFB_CONSOLE
@@ -217,6 +220,11 @@
 
 #define CONFIG_SYS_MEM_TOP_HIDE ((CONFIG_SUNXI_FB_SIZE + 0xFFF) & ~0xFFF)
 
+/* To be able to hook simplefb into dt */
+#ifdef CONFIG_VIDEO_DT_SIMPLEFB
+#define CONFIG_OF_BOARD_SETUP
+#endif
+
 #endif /* CONFIG_VIDEO */
 
 /* Ethernet support */