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https://github.com/AsahiLinux/u-boot
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77debf61ef
Add a new function to activate an existing simple frame buffer node and add the associated reserved memory, with no-map properties. This device tree update is only done when the video device is active and the video buffer is used. This patch uses '#if CONFIG_IS_ENABLED(DM_VIDEO)' because gd->video_bottom and gd->video_top are only defined when CONFIG_DM_VIDEO is activated. Signed-off-by: Patrick Delaunay <patrick.delaunay@foss.st.com> Reviewed-by: Patrice Chotard <patrice.chotard@foss.st.com>
118 lines
2.5 KiB
C
118 lines
2.5 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* Simplefb device tree support
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*
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* (C) Copyright 2015
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* Stephen Warren <swarren@wwwdotorg.org>
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*/
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#include <common.h>
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#include <dm.h>
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#include <lcd.h>
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#include <fdt_support.h>
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#include <asm/global_data.h>
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#include <linux/libfdt.h>
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#include <video.h>
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DECLARE_GLOBAL_DATA_PTR;
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static int fdt_simplefb_configure_node(void *blob, int off)
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{
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int xsize, ysize;
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int bpix; /* log2 of bits per pixel */
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const char *name;
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ulong fb_base;
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#ifdef CONFIG_DM_VIDEO
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struct video_uc_plat *plat;
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struct video_priv *uc_priv;
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struct udevice *dev;
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int ret;
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ret = uclass_first_device_err(UCLASS_VIDEO, &dev);
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if (ret)
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return ret;
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uc_priv = dev_get_uclass_priv(dev);
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plat = dev_get_uclass_plat(dev);
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xsize = uc_priv->xsize;
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ysize = uc_priv->ysize;
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bpix = uc_priv->bpix;
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fb_base = plat->base;
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#else
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xsize = lcd_get_pixel_width();
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ysize = lcd_get_pixel_height();
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bpix = LCD_BPP;
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fb_base = gd->fb_base;
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#endif
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switch (bpix) {
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case 4: /* VIDEO_BPP16 */
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name = "r5g6b5";
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break;
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case 5: /* VIDEO_BPP32 */
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name = "a8r8g8b8";
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break;
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default:
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return -EINVAL;
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}
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return fdt_setup_simplefb_node(blob, off, fb_base, xsize, ysize,
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xsize * (1 << bpix) / 8, name);
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}
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int fdt_simplefb_add_node(void *blob)
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{
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static const char compat[] = "simple-framebuffer";
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static const char disabled[] = "disabled";
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int off, ret;
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off = fdt_add_subnode(blob, 0, "framebuffer");
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if (off < 0)
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return -1;
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ret = fdt_setprop(blob, off, "status", disabled, sizeof(disabled));
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if (ret < 0)
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return -1;
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ret = fdt_setprop(blob, off, "compatible", compat, sizeof(compat));
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if (ret < 0)
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return -1;
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return fdt_simplefb_configure_node(blob, off);
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}
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int fdt_simplefb_enable_existing_node(void *blob)
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{
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int off;
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off = fdt_node_offset_by_compatible(blob, -1, "simple-framebuffer");
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if (off < 0)
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return -1;
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return fdt_simplefb_configure_node(blob, off);
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}
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#if CONFIG_IS_ENABLED(DM_VIDEO)
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int fdt_simplefb_enable_and_mem_rsv(void *blob)
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{
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struct fdt_memory mem;
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int ret;
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/* nothing to do when video is not active */
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if (!video_is_active())
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return 0;
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ret = fdt_simplefb_enable_existing_node(blob);
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if (ret)
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return ret;
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/* nothing to do when the frame buffer is not defined */
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if (gd->video_bottom == gd->video_top)
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return 0;
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/* reserved with no-map tag the video buffer */
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mem.start = gd->video_bottom;
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mem.end = gd->video_top - 1;
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return fdtdec_add_reserved_memory(blob, "framebuffer", &mem, NULL, 0, NULL,
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FDTDEC_RESERVED_MEMORY_NO_MAP);
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}
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#endif
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