107 lines
3.0 KiB
C
107 lines
3.0 KiB
C
/*
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* drm kms/fb cma (contiguous memory allocator) helper functions
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*
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* Copyright (C) 2012 Analog Device Inc.
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* Author: Lars-Peter Clausen <lars@metafoo.de>
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*
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* Based on udl_fbdev.c
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* Copyright (C) 2012 Red Hat
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*/
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#include <drm/drm_fourcc.h>
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#include <drm/drm_framebuffer.h>
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#include <drm/drm_gem_cma_helper.h>
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#include <drm/drm_gem_framebuffer_helper.h>
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#include <drm/drm_plane.h>
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#include <linux/module.h>
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/**
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* DOC: framebuffer cma helper functions
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*
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* Provides helper functions for creating a cma (contiguous memory allocator)
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* backed framebuffer.
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*
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* drm_gem_fb_create() is used in the &drm_mode_config_funcs.fb_create
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* callback function to create a cma backed framebuffer.
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*/
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/**
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* drm_fb_cma_get_gem_obj() - Get CMA GEM object for framebuffer
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* @fb: The framebuffer
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* @plane: Which plane
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*
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* Return the CMA GEM object for given framebuffer.
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*
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* This function will usually be called from the CRTC callback functions.
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*/
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struct drm_gem_cma_object *drm_fb_cma_get_gem_obj(struct drm_framebuffer *fb,
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unsigned int plane)
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{
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struct drm_gem_object *gem;
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gem = drm_gem_fb_get_obj(fb, plane);
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if (!gem)
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return NULL;
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return to_drm_gem_cma_obj(gem);
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}
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EXPORT_SYMBOL_GPL(drm_fb_cma_get_gem_obj);
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/**
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* drm_fb_cma_get_gem_addr() - Get physical address for framebuffer, for pixel
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* formats where values are grouped in blocks this will get you the beginning of
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* the block
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* @fb: The framebuffer
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* @state: Which state of drm plane
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* @plane: Which plane
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* Return the CMA GEM address for given framebuffer.
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*
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* This function will usually be called from the PLANE callback functions.
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*/
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dma_addr_t drm_fb_cma_get_gem_addr(struct drm_framebuffer *fb,
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struct drm_plane_state *state,
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unsigned int plane)
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{
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struct drm_gem_cma_object *obj;
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dma_addr_t paddr;
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u8 h_div = 1, v_div = 1;
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u32 block_w = drm_format_info_block_width(fb->format, plane);
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u32 block_h = drm_format_info_block_height(fb->format, plane);
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u32 block_size = fb->format->char_per_block[plane];
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u32 sample_x;
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u32 sample_y;
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u32 block_start_y;
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u32 num_hblocks;
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obj = drm_fb_cma_get_gem_obj(fb, plane);
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if (!obj)
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return 0;
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paddr = obj->paddr + fb->offsets[plane];
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if (plane > 0) {
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h_div = fb->format->hsub;
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v_div = fb->format->vsub;
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}
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sample_x = (state->src_x >> 16) / h_div;
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sample_y = (state->src_y >> 16) / v_div;
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block_start_y = (sample_y / block_h) * block_h;
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num_hblocks = sample_x / block_w;
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paddr += fb->pitches[plane] * block_start_y;
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paddr += block_size * num_hblocks;
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return paddr;
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}
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EXPORT_SYMBOL_GPL(drm_fb_cma_get_gem_addr);
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