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// SPDX-License-Identifier: GPL-2.0-or-later
/*
* drm kms/fb cma (contiguous memory allocator) helper functions
*
* Copyright (C) 2012 Analog Device Inc.
* Author: Lars-Peter Clausen <lars@metafoo.de>
*
* Based on udl_fbdev.c
* Copyright (C) 2012 Red Hat
*/
#include <drm/drm_fourcc.h>
#include <drm/drm_framebuffer.h>
#include <drm/drm_gem_cma_helper.h>
#include <drm/drm_gem_framebuffer_helper.h>
#include <drm/drm_plane.h>
#include <linux/module.h>
/**
* DOC: framebuffer cma helper functions
*
* Provides helper functions for creating a cma (contiguous memory allocator)
* backed framebuffer.
*
* drm_gem_fb_create() is used in the &drm_mode_config_funcs.fb_create
* callback function to create a cma backed framebuffer.
*/
/**
* drm_fb_cma_get_gem_obj() - Get CMA GEM object for framebuffer
* @fb: The framebuffer
* @plane: Which plane
*
* Return the CMA GEM object for given framebuffer.
*
* This function will usually be called from the CRTC callback functions.
*/
struct drm_gem_cma_object *drm_fb_cma_get_gem_obj(struct drm_framebuffer *fb,
unsigned int plane)
{
struct drm_gem_object *gem;
gem = drm_gem_fb_get_obj(fb, plane);
if (!gem)
return NULL;
return to_drm_gem_cma_obj(gem);
}
EXPORT_SYMBOL_GPL(drm_fb_cma_get_gem_obj);
/**
* drm_fb_cma_get_gem_addr() - Get physical address for framebuffer, for pixel
* formats where values are grouped in blocks this will get you the beginning of
* the block
* @fb: The framebuffer
* @state: Which state of drm plane
* @plane: Which plane
* Return the CMA GEM address for given framebuffer.
*
* This function will usually be called from the PLANE callback functions.
*/
dma_addr_t drm_fb_cma_get_gem_addr(struct drm_framebuffer *fb,
struct drm_plane_state *state,
unsigned int plane)
{
struct drm_gem_cma_object *obj;
dma_addr_t paddr;
u8 h_div = 1, v_div = 1;
u32 block_w = drm_format_info_block_width(fb->format, plane);
u32 block_h = drm_format_info_block_height(fb->format, plane);
u32 block_size = fb->format->char_per_block[plane];
u32 sample_x;
u32 sample_y;
u32 block_start_y;
u32 num_hblocks;
obj = drm_fb_cma_get_gem_obj(fb, plane);
if (!obj)
return 0;
paddr = obj->paddr + fb->offsets[plane];
if (plane > 0) {
h_div = fb->format->hsub;
v_div = fb->format->vsub;
}
sample_x = (state->src_x >> 16) / h_div;
sample_y = (state->src_y >> 16) / v_div;
block_start_y = (sample_y / block_h) * block_h;
num_hblocks = sample_x / block_w;
paddr += fb->pitches[plane] * block_start_y;
paddr += block_size * num_hblocks;
return paddr;
}
EXPORT_SYMBOL_GPL(drm_fb_cma_get_gem_addr);
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