| /* exynos_drm_fbdev.c |
| * |
| * Copyright (c) 2011 Samsung Electronics Co., Ltd. |
| * Authors: |
| * Inki Dae <inki.dae@samsung.com> |
| * Joonyoung Shim <jy0922.shim@samsung.com> |
| * Seung-Woo Kim <sw0312.kim@samsung.com> |
| * |
| * This program is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License as published by the |
| * Free Software Foundation; either version 2 of the License, or (at your |
| * option) any later version. |
| */ |
| |
| #include <drm/drmP.h> |
| #include <drm/drm_crtc.h> |
| #include <drm/drm_fb_helper.h> |
| #include <drm/drm_crtc_helper.h> |
| #include <drm/exynos_drm.h> |
| |
| #include "exynos_drm_drv.h" |
| #include "exynos_drm_fb.h" |
| #include "exynos_drm_fbdev.h" |
| #include "exynos_drm_gem.h" |
| #include "exynos_drm_iommu.h" |
| |
| #define MAX_CONNECTOR 4 |
| #define PREFERRED_BPP 32 |
| |
| #define to_exynos_fbdev(x) container_of(x, struct exynos_drm_fbdev,\ |
| drm_fb_helper) |
| |
| struct exynos_drm_fbdev { |
| struct drm_fb_helper drm_fb_helper; |
| struct exynos_drm_gem_obj *exynos_gem_obj; |
| }; |
| |
| static int exynos_drm_fb_mmap(struct fb_info *info, |
| struct vm_area_struct *vma) |
| { |
| struct drm_fb_helper *helper = info->par; |
| struct exynos_drm_fbdev *exynos_fbd = to_exynos_fbdev(helper); |
| struct exynos_drm_gem_obj *exynos_gem_obj = exynos_fbd->exynos_gem_obj; |
| struct exynos_drm_gem_buf *buffer = exynos_gem_obj->buffer; |
| unsigned long vm_size; |
| int ret; |
| |
| vma->vm_flags |= VM_IO | VM_DONTEXPAND | VM_DONTDUMP; |
| |
| vm_size = vma->vm_end - vma->vm_start; |
| |
| if (vm_size > buffer->size) |
| return -EINVAL; |
| |
| ret = dma_mmap_attrs(helper->dev->dev, vma, buffer->pages, |
| buffer->dma_addr, buffer->size, &buffer->dma_attrs); |
| if (ret < 0) { |
| DRM_ERROR("failed to mmap.\n"); |
| return ret; |
| } |
| |
| return 0; |
| } |
| |
| static struct fb_ops exynos_drm_fb_ops = { |
| .owner = THIS_MODULE, |
| .fb_mmap = exynos_drm_fb_mmap, |
| .fb_fillrect = cfb_fillrect, |
| .fb_copyarea = cfb_copyarea, |
| .fb_imageblit = cfb_imageblit, |
| .fb_check_var = drm_fb_helper_check_var, |
| .fb_set_par = drm_fb_helper_set_par, |
| .fb_blank = drm_fb_helper_blank, |
| .fb_pan_display = drm_fb_helper_pan_display, |
| .fb_setcmap = drm_fb_helper_setcmap, |
| }; |
| |
| static int exynos_drm_fbdev_update(struct drm_fb_helper *helper, |
| struct drm_framebuffer *fb) |
| { |
| struct fb_info *fbi = helper->fbdev; |
| struct drm_device *dev = helper->dev; |
| struct exynos_drm_gem_buf *buffer; |
| unsigned int size = fb->width * fb->height * (fb->bits_per_pixel >> 3); |
| unsigned long offset; |
| |
| drm_fb_helper_fill_fix(fbi, fb->pitches[0], fb->depth); |
| drm_fb_helper_fill_var(fbi, helper, fb->width, fb->height); |
| |
| /* RGB formats use only one buffer */ |
| buffer = exynos_drm_fb_buffer(fb, 0); |
| if (!buffer) { |
| DRM_LOG_KMS("buffer is null.\n"); |
| return -EFAULT; |
| } |
| |
| /* map pages with kernel virtual space. */ |
| if (!buffer->kvaddr) { |
| if (is_drm_iommu_supported(dev)) { |
| unsigned int nr_pages = buffer->size >> PAGE_SHIFT; |
| |
| buffer->kvaddr = vmap(buffer->pages, nr_pages, VM_MAP, |
| pgprot_writecombine(PAGE_KERNEL)); |
| } else { |
| phys_addr_t dma_addr = buffer->dma_addr; |
| if (dma_addr) |
| buffer->kvaddr = phys_to_virt(dma_addr); |
| else |
| buffer->kvaddr = (void __iomem *)NULL; |
| } |
| if (!buffer->kvaddr) { |
| DRM_ERROR("failed to map pages to kernel space.\n"); |
| return -EIO; |
| } |
| } |
| |
| /* buffer count to framebuffer always is 1 at booting time. */ |
| exynos_drm_fb_set_buf_cnt(fb, 1); |
| |
| offset = fbi->var.xoffset * (fb->bits_per_pixel >> 3); |
| offset += fbi->var.yoffset * fb->pitches[0]; |
| |
| dev->mode_config.fb_base = (resource_size_t)buffer->dma_addr; |
| fbi->screen_base = buffer->kvaddr + offset; |
| if (is_drm_iommu_supported(dev)) |
| fbi->fix.smem_start = (unsigned long) |
| (page_to_phys(sg_page(buffer->sgt->sgl)) + offset); |
| else |
| fbi->fix.smem_start = (unsigned long)buffer->dma_addr; |
| |
| fbi->screen_size = size; |
| fbi->fix.smem_len = size; |
| |
| return 0; |
| } |
| |
| static int exynos_drm_fbdev_create(struct drm_fb_helper *helper, |
| struct drm_fb_helper_surface_size *sizes) |
| { |
| struct exynos_drm_fbdev *exynos_fbdev = to_exynos_fbdev(helper); |
| struct exynos_drm_gem_obj *exynos_gem_obj; |
| struct drm_device *dev = helper->dev; |
| struct fb_info *fbi; |
| struct drm_mode_fb_cmd2 mode_cmd = { 0 }; |
| struct platform_device *pdev = dev->platformdev; |
| unsigned long size; |
| int ret; |
| |
| DRM_DEBUG_KMS("surface width(%d), height(%d) and bpp(%d\n", |
| sizes->surface_width, sizes->surface_height, |
| sizes->surface_bpp); |
| |
| mode_cmd.width = sizes->surface_width; |
| mode_cmd.height = sizes->surface_height; |
| mode_cmd.pitches[0] = sizes->surface_width * (sizes->surface_bpp >> 3); |
| mode_cmd.pixel_format = drm_mode_legacy_fb_format(sizes->surface_bpp, |
| sizes->surface_depth); |
| |
| mutex_lock(&dev->struct_mutex); |
| |
| fbi = framebuffer_alloc(0, &pdev->dev); |
| if (!fbi) { |
| DRM_ERROR("failed to allocate fb info.\n"); |
| ret = -ENOMEM; |
| goto out; |
| } |
| |
| size = mode_cmd.pitches[0] * mode_cmd.height; |
| |
| exynos_gem_obj = exynos_drm_gem_create(dev, EXYNOS_BO_CONTIG, size); |
| /* |
| * If physically contiguous memory allocation fails and if IOMMU is |
| * supported then try to get buffer from non physically contiguous |
| * memory area. |
| */ |
| if (IS_ERR(exynos_gem_obj) && is_drm_iommu_supported(dev)) { |
| dev_warn(&pdev->dev, "contiguous FB allocation failed, falling back to non-contiguous\n"); |
| exynos_gem_obj = exynos_drm_gem_create(dev, EXYNOS_BO_NONCONTIG, |
| size); |
| } |
| |
| if (IS_ERR(exynos_gem_obj)) { |
| ret = PTR_ERR(exynos_gem_obj); |
| goto err_release_framebuffer; |
| } |
| |
| exynos_fbdev->exynos_gem_obj = exynos_gem_obj; |
| |
| helper->fb = exynos_drm_framebuffer_init(dev, &mode_cmd, |
| &exynos_gem_obj->base); |
| if (IS_ERR(helper->fb)) { |
| DRM_ERROR("failed to create drm framebuffer.\n"); |
| ret = PTR_ERR(helper->fb); |
| goto err_destroy_gem; |
| } |
| |
| helper->fbdev = fbi; |
| |
| fbi->par = helper; |
| fbi->flags = FBINFO_FLAG_DEFAULT; |
| fbi->fbops = &exynos_drm_fb_ops; |
| |
| ret = fb_alloc_cmap(&fbi->cmap, 256, 0); |
| if (ret) { |
| DRM_ERROR("failed to allocate cmap.\n"); |
| goto err_destroy_framebuffer; |
| } |
| |
| ret = exynos_drm_fbdev_update(helper, helper->fb); |
| if (ret < 0) |
| goto err_dealloc_cmap; |
| |
| mutex_unlock(&dev->struct_mutex); |
| return ret; |
| |
| err_dealloc_cmap: |
| fb_dealloc_cmap(&fbi->cmap); |
| err_destroy_framebuffer: |
| drm_framebuffer_cleanup(helper->fb); |
| err_destroy_gem: |
| exynos_drm_gem_destroy(exynos_gem_obj); |
| err_release_framebuffer: |
| framebuffer_release(fbi); |
| |
| /* |
| * if failed, all resources allocated above would be released by |
| * drm_mode_config_cleanup() when drm_load() had been called prior |
| * to any specific driver such as fimd or hdmi driver. |
| */ |
| out: |
| mutex_unlock(&dev->struct_mutex); |
| return ret; |
| } |
| |
| static struct drm_fb_helper_funcs exynos_drm_fb_helper_funcs = { |
| .fb_probe = exynos_drm_fbdev_create, |
| }; |
| |
| int exynos_drm_fbdev_init(struct drm_device *dev) |
| { |
| struct exynos_drm_fbdev *fbdev; |
| struct exynos_drm_private *private = dev->dev_private; |
| struct drm_fb_helper *helper; |
| unsigned int num_crtc; |
| int ret; |
| |
| if (!dev->mode_config.num_crtc || !dev->mode_config.num_connector) |
| return 0; |
| |
| fbdev = kzalloc(sizeof(*fbdev), GFP_KERNEL); |
| if (!fbdev) |
| return -ENOMEM; |
| |
| private->fb_helper = helper = &fbdev->drm_fb_helper; |
| helper->funcs = &exynos_drm_fb_helper_funcs; |
| |
| num_crtc = dev->mode_config.num_crtc; |
| |
| ret = drm_fb_helper_init(dev, helper, num_crtc, MAX_CONNECTOR); |
| if (ret < 0) { |
| DRM_ERROR("failed to initialize drm fb helper.\n"); |
| goto err_init; |
| } |
| |
| ret = drm_fb_helper_single_add_all_connectors(helper); |
| if (ret < 0) { |
| DRM_ERROR("failed to register drm_fb_helper_connector.\n"); |
| goto err_setup; |
| |
| } |
| |
| /* disable all the possible outputs/crtcs before entering KMS mode */ |
| drm_helper_disable_unused_functions(dev); |
| |
| ret = drm_fb_helper_initial_config(helper, PREFERRED_BPP); |
| if (ret < 0) { |
| DRM_ERROR("failed to set up hw configuration.\n"); |
| goto err_setup; |
| } |
| |
| return 0; |
| |
| err_setup: |
| drm_fb_helper_fini(helper); |
| |
| err_init: |
| private->fb_helper = NULL; |
| kfree(fbdev); |
| |
| return ret; |
| } |
| |
| static void exynos_drm_fbdev_destroy(struct drm_device *dev, |
| struct drm_fb_helper *fb_helper) |
| { |
| struct exynos_drm_fbdev *exynos_fbd = to_exynos_fbdev(fb_helper); |
| struct exynos_drm_gem_obj *exynos_gem_obj = exynos_fbd->exynos_gem_obj; |
| struct drm_framebuffer *fb; |
| |
| if (is_drm_iommu_supported(dev) && exynos_gem_obj->buffer->kvaddr) |
| vunmap(exynos_gem_obj->buffer->kvaddr); |
| |
| /* release drm framebuffer and real buffer */ |
| if (fb_helper->fb && fb_helper->fb->funcs) { |
| fb = fb_helper->fb; |
| if (fb) { |
| drm_framebuffer_unregister_private(fb); |
| drm_framebuffer_remove(fb); |
| } |
| } |
| |
| /* release linux framebuffer */ |
| if (fb_helper->fbdev) { |
| struct fb_info *info; |
| int ret; |
| |
| info = fb_helper->fbdev; |
| ret = unregister_framebuffer(info); |
| if (ret < 0) |
| DRM_DEBUG_KMS("failed unregister_framebuffer()\n"); |
| |
| if (info->cmap.len) |
| fb_dealloc_cmap(&info->cmap); |
| |
| framebuffer_release(info); |
| } |
| |
| drm_fb_helper_fini(fb_helper); |
| } |
| |
| void exynos_drm_fbdev_fini(struct drm_device *dev) |
| { |
| struct exynos_drm_private *private = dev->dev_private; |
| struct exynos_drm_fbdev *fbdev; |
| |
| if (!private || !private->fb_helper) |
| return; |
| |
| fbdev = to_exynos_fbdev(private->fb_helper); |
| |
| if (fbdev->exynos_gem_obj) |
| exynos_drm_gem_destroy(fbdev->exynos_gem_obj); |
| |
| exynos_drm_fbdev_destroy(dev, private->fb_helper); |
| kfree(fbdev); |
| private->fb_helper = NULL; |
| } |
| |
| void exynos_drm_fbdev_restore_mode(struct drm_device *dev) |
| { |
| struct exynos_drm_private *private = dev->dev_private; |
| |
| if (!private || !private->fb_helper) |
| return; |
| |
| drm_modeset_lock_all(dev); |
| drm_fb_helper_restore_fbdev_mode(private->fb_helper); |
| drm_modeset_unlock_all(dev); |
| } |