![Inki Dae](/assets/img/avatar_default.png)
Changelog v3: just code cleanup. Changelog v2: fix argument to dma_mmap_attr function. - use pages instead of kvaddr because kvaddr is 0 with DMA_ATTR_NO_KERNEL_MAPPING. Changelog v1: When gem allocation is requested, kernel space mapping isn't needed. But if need, such as console framebuffer, the physical pages would be mapped with kernel space though vmap function. Signed-off-by: Inki Dae <inki.dae@samsung.com> Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com>
379 lines
9.9 KiB
C
379 lines
9.9 KiB
C
/* exynos_drm_fbdev.c
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*
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* Copyright (c) 2011 Samsung Electronics Co., Ltd.
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* Authors:
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* Inki Dae <inki.dae@samsung.com>
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* Joonyoung Shim <jy0922.shim@samsung.com>
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* Seung-Woo Kim <sw0312.kim@samsung.com>
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the "Software"),
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* to deal in the Software without restriction, including without limitation
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* the rights to use, copy, modify, merge, publish, distribute, sublicense,
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* and/or sell copies of the Software, and to permit persons to whom the
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* Software is furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice (including the next
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* paragraph) shall be included in all copies or substantial portions of the
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* Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* VA LINUX SYSTEMS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
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* OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
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* ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
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* OTHER DEALINGS IN THE SOFTWARE.
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*/
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#include <drm/drmP.h>
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#include <drm/drm_crtc.h>
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#include <drm/drm_fb_helper.h>
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#include <drm/drm_crtc_helper.h>
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#include "exynos_drm_drv.h"
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#include "exynos_drm_fb.h"
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#include "exynos_drm_gem.h"
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#define MAX_CONNECTOR 4
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#define PREFERRED_BPP 32
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#define to_exynos_fbdev(x) container_of(x, struct exynos_drm_fbdev,\
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drm_fb_helper)
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struct exynos_drm_fbdev {
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struct drm_fb_helper drm_fb_helper;
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struct exynos_drm_gem_obj *exynos_gem_obj;
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};
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static int exynos_drm_fb_mmap(struct fb_info *info,
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struct vm_area_struct *vma)
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{
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struct drm_fb_helper *helper = info->par;
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struct exynos_drm_fbdev *exynos_fbd = to_exynos_fbdev(helper);
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struct exynos_drm_gem_obj *exynos_gem_obj = exynos_fbd->exynos_gem_obj;
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struct exynos_drm_gem_buf *buffer = exynos_gem_obj->buffer;
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unsigned long vm_size;
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int ret;
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DRM_DEBUG_KMS("%s\n", __func__);
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vma->vm_flags |= VM_IO | VM_DONTEXPAND | VM_DONTDUMP;
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vm_size = vma->vm_end - vma->vm_start;
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if (vm_size > buffer->size)
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return -EINVAL;
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ret = dma_mmap_attrs(helper->dev->dev, vma, buffer->pages,
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buffer->dma_addr, buffer->size, &buffer->dma_attrs);
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if (ret < 0) {
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DRM_ERROR("failed to mmap.\n");
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return ret;
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}
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return 0;
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}
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static struct fb_ops exynos_drm_fb_ops = {
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.owner = THIS_MODULE,
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.fb_mmap = exynos_drm_fb_mmap,
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.fb_fillrect = cfb_fillrect,
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.fb_copyarea = cfb_copyarea,
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.fb_imageblit = cfb_imageblit,
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.fb_check_var = drm_fb_helper_check_var,
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.fb_set_par = drm_fb_helper_set_par,
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.fb_blank = drm_fb_helper_blank,
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.fb_pan_display = drm_fb_helper_pan_display,
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.fb_setcmap = drm_fb_helper_setcmap,
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};
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static int exynos_drm_fbdev_update(struct drm_fb_helper *helper,
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struct drm_framebuffer *fb)
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{
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struct fb_info *fbi = helper->fbdev;
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struct drm_device *dev = helper->dev;
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struct exynos_drm_gem_buf *buffer;
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unsigned int size = fb->width * fb->height * (fb->bits_per_pixel >> 3);
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unsigned long offset;
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DRM_DEBUG_KMS("%s\n", __FILE__);
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drm_fb_helper_fill_fix(fbi, fb->pitches[0], fb->depth);
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drm_fb_helper_fill_var(fbi, helper, fb->width, fb->height);
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/* RGB formats use only one buffer */
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buffer = exynos_drm_fb_buffer(fb, 0);
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if (!buffer) {
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DRM_LOG_KMS("buffer is null.\n");
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return -EFAULT;
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}
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/* map pages with kernel virtual space. */
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if (!buffer->kvaddr) {
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unsigned int nr_pages = buffer->size >> PAGE_SHIFT;
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buffer->kvaddr = vmap(buffer->pages, nr_pages, VM_MAP,
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pgprot_writecombine(PAGE_KERNEL));
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if (!buffer->kvaddr) {
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DRM_ERROR("failed to map pages to kernel space.\n");
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return -EIO;
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}
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}
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/* buffer count to framebuffer always is 1 at booting time. */
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exynos_drm_fb_set_buf_cnt(fb, 1);
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offset = fbi->var.xoffset * (fb->bits_per_pixel >> 3);
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offset += fbi->var.yoffset * fb->pitches[0];
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dev->mode_config.fb_base = (resource_size_t)buffer->dma_addr;
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fbi->screen_base = buffer->kvaddr + offset;
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fbi->fix.smem_start = (unsigned long)
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(page_to_phys(sg_page(buffer->sgt->sgl)) + offset);
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fbi->screen_size = size;
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fbi->fix.smem_len = size;
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return 0;
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}
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static int exynos_drm_fbdev_create(struct drm_fb_helper *helper,
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struct drm_fb_helper_surface_size *sizes)
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{
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struct exynos_drm_fbdev *exynos_fbdev = to_exynos_fbdev(helper);
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struct exynos_drm_gem_obj *exynos_gem_obj;
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struct drm_device *dev = helper->dev;
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struct fb_info *fbi;
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struct drm_mode_fb_cmd2 mode_cmd = { 0 };
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struct platform_device *pdev = dev->platformdev;
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unsigned long size;
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int ret;
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DRM_DEBUG_KMS("%s\n", __FILE__);
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DRM_DEBUG_KMS("surface width(%d), height(%d) and bpp(%d\n",
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sizes->surface_width, sizes->surface_height,
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sizes->surface_bpp);
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mode_cmd.width = sizes->surface_width;
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mode_cmd.height = sizes->surface_height;
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mode_cmd.pitches[0] = sizes->surface_width * (sizes->surface_bpp >> 3);
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mode_cmd.pixel_format = drm_mode_legacy_fb_format(sizes->surface_bpp,
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sizes->surface_depth);
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mutex_lock(&dev->struct_mutex);
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fbi = framebuffer_alloc(0, &pdev->dev);
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if (!fbi) {
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DRM_ERROR("failed to allocate fb info.\n");
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ret = -ENOMEM;
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goto out;
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}
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size = mode_cmd.pitches[0] * mode_cmd.height;
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/* 0 means to allocate physically continuous memory */
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exynos_gem_obj = exynos_drm_gem_create(dev, 0, size);
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if (IS_ERR(exynos_gem_obj)) {
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ret = PTR_ERR(exynos_gem_obj);
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goto err_release_framebuffer;
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}
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exynos_fbdev->exynos_gem_obj = exynos_gem_obj;
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helper->fb = exynos_drm_framebuffer_init(dev, &mode_cmd,
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&exynos_gem_obj->base);
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if (IS_ERR_OR_NULL(helper->fb)) {
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DRM_ERROR("failed to create drm framebuffer.\n");
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ret = PTR_ERR(helper->fb);
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goto err_destroy_gem;
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}
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helper->fbdev = fbi;
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fbi->par = helper;
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fbi->flags = FBINFO_FLAG_DEFAULT;
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fbi->fbops = &exynos_drm_fb_ops;
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ret = fb_alloc_cmap(&fbi->cmap, 256, 0);
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if (ret) {
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DRM_ERROR("failed to allocate cmap.\n");
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goto err_destroy_framebuffer;
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}
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ret = exynos_drm_fbdev_update(helper, helper->fb);
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if (ret < 0)
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goto err_dealloc_cmap;
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mutex_unlock(&dev->struct_mutex);
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return ret;
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err_dealloc_cmap:
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fb_dealloc_cmap(&fbi->cmap);
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err_destroy_framebuffer:
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drm_framebuffer_cleanup(helper->fb);
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err_destroy_gem:
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exynos_drm_gem_destroy(exynos_gem_obj);
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err_release_framebuffer:
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framebuffer_release(fbi);
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/*
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* if failed, all resources allocated above would be released by
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* drm_mode_config_cleanup() when drm_load() had been called prior
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* to any specific driver such as fimd or hdmi driver.
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*/
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out:
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mutex_unlock(&dev->struct_mutex);
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return ret;
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}
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static int exynos_drm_fbdev_probe(struct drm_fb_helper *helper,
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struct drm_fb_helper_surface_size *sizes)
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{
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int ret = 0;
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DRM_DEBUG_KMS("%s\n", __FILE__);
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/*
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* with !helper->fb, it means that this funcion is called first time
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* and after that, the helper->fb would be used as clone mode.
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*/
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if (!helper->fb) {
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ret = exynos_drm_fbdev_create(helper, sizes);
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if (ret < 0) {
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DRM_ERROR("failed to create fbdev.\n");
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return ret;
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}
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/*
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* fb_helper expects a value more than 1 if succeed
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* because register_framebuffer() should be called.
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*/
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ret = 1;
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}
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return ret;
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}
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static struct drm_fb_helper_funcs exynos_drm_fb_helper_funcs = {
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.fb_probe = exynos_drm_fbdev_probe,
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};
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int exynos_drm_fbdev_init(struct drm_device *dev)
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{
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struct exynos_drm_fbdev *fbdev;
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struct exynos_drm_private *private = dev->dev_private;
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struct drm_fb_helper *helper;
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unsigned int num_crtc;
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int ret;
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DRM_DEBUG_KMS("%s\n", __FILE__);
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if (!dev->mode_config.num_crtc || !dev->mode_config.num_connector)
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return 0;
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fbdev = kzalloc(sizeof(*fbdev), GFP_KERNEL);
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if (!fbdev) {
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DRM_ERROR("failed to allocate drm fbdev.\n");
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return -ENOMEM;
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}
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private->fb_helper = helper = &fbdev->drm_fb_helper;
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helper->funcs = &exynos_drm_fb_helper_funcs;
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num_crtc = dev->mode_config.num_crtc;
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ret = drm_fb_helper_init(dev, helper, num_crtc, MAX_CONNECTOR);
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if (ret < 0) {
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DRM_ERROR("failed to initialize drm fb helper.\n");
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goto err_init;
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}
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ret = drm_fb_helper_single_add_all_connectors(helper);
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if (ret < 0) {
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DRM_ERROR("failed to register drm_fb_helper_connector.\n");
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goto err_setup;
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}
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ret = drm_fb_helper_initial_config(helper, PREFERRED_BPP);
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if (ret < 0) {
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DRM_ERROR("failed to set up hw configuration.\n");
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goto err_setup;
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}
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return 0;
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err_setup:
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drm_fb_helper_fini(helper);
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err_init:
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private->fb_helper = NULL;
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kfree(fbdev);
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return ret;
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}
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static void exynos_drm_fbdev_destroy(struct drm_device *dev,
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struct drm_fb_helper *fb_helper)
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{
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struct exynos_drm_fbdev *exynos_fbd = to_exynos_fbdev(fb_helper);
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struct exynos_drm_gem_obj *exynos_gem_obj = exynos_fbd->exynos_gem_obj;
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struct drm_framebuffer *fb;
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if (exynos_gem_obj->buffer->kvaddr)
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vunmap(exynos_gem_obj->buffer->kvaddr);
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/* release drm framebuffer and real buffer */
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if (fb_helper->fb && fb_helper->fb->funcs) {
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fb = fb_helper->fb;
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if (fb)
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drm_framebuffer_remove(fb);
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}
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/* release linux framebuffer */
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if (fb_helper->fbdev) {
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struct fb_info *info;
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int ret;
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info = fb_helper->fbdev;
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ret = unregister_framebuffer(info);
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if (ret < 0)
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DRM_DEBUG_KMS("failed unregister_framebuffer()\n");
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if (info->cmap.len)
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fb_dealloc_cmap(&info->cmap);
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framebuffer_release(info);
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}
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drm_fb_helper_fini(fb_helper);
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}
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void exynos_drm_fbdev_fini(struct drm_device *dev)
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{
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struct exynos_drm_private *private = dev->dev_private;
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struct exynos_drm_fbdev *fbdev;
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if (!private || !private->fb_helper)
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return;
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fbdev = to_exynos_fbdev(private->fb_helper);
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if (fbdev->exynos_gem_obj)
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exynos_drm_gem_destroy(fbdev->exynos_gem_obj);
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exynos_drm_fbdev_destroy(dev, private->fb_helper);
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kfree(fbdev);
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private->fb_helper = NULL;
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}
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void exynos_drm_fbdev_restore_mode(struct drm_device *dev)
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{
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struct exynos_drm_private *private = dev->dev_private;
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if (!private || !private->fb_helper)
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return;
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drm_fb_helper_restore_fbdev_mode(private->fb_helper);
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}
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