1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* exynos_drm_fbdev.c 3 * 4 * Copyright (c) 2011 Samsung Electronics Co., Ltd. 5 * Authors: 6 * Inki Dae <inki.dae@samsung.com> 7 * Joonyoung Shim <jy0922.shim@samsung.com> 8 * Seung-Woo Kim <sw0312.kim@samsung.com> 9 */ 10 11 #include <linux/fb.h> 12 13 #include <drm/drm_crtc_helper.h> 14 #include <drm/drm_drv.h> 15 #include <drm/drm_fb_helper.h> 16 #include <drm/drm_framebuffer.h> 17 #include <drm/drm_gem_framebuffer_helper.h> 18 #include <drm/drm_prime.h> 19 #include <drm/exynos_drm.h> 20 21 #include "exynos_drm_drv.h" 22 #include "exynos_drm_fb.h" 23 #include "exynos_drm_fbdev.h" 24 25 #define MAX_CONNECTOR 4 26 27 static int exynos_drm_fb_mmap(struct fb_info *info, struct vm_area_struct *vma) 28 { 29 struct drm_fb_helper *helper = info->par; 30 struct drm_gem_object *obj = drm_gem_fb_get_obj(helper->fb, 0); 31 32 return drm_gem_prime_mmap(obj, vma); 33 } 34 35 static void exynos_drm_fb_destroy(struct fb_info *info) 36 { 37 struct drm_fb_helper *fb_helper = info->par; 38 struct drm_framebuffer *fb = fb_helper->fb; 39 40 drm_fb_helper_fini(fb_helper); 41 42 drm_framebuffer_remove(fb); 43 44 drm_client_release(&fb_helper->client); 45 drm_fb_helper_unprepare(fb_helper); 46 kfree(fb_helper); 47 } 48 49 static const struct fb_ops exynos_drm_fb_ops = { 50 .owner = THIS_MODULE, 51 __FB_DEFAULT_DMAMEM_OPS_RDWR, 52 DRM_FB_HELPER_DEFAULT_OPS, 53 __FB_DEFAULT_DMAMEM_OPS_DRAW, 54 .fb_mmap = exynos_drm_fb_mmap, 55 .fb_destroy = exynos_drm_fb_destroy, 56 }; 57 58 static int exynos_drm_fbdev_update(struct drm_fb_helper *helper, 59 struct drm_fb_helper_surface_size *sizes, 60 struct exynos_drm_gem *exynos_gem) 61 { 62 struct fb_info *fbi; 63 struct drm_framebuffer *fb = helper->fb; 64 unsigned int size = fb->width * fb->height * fb->format->cpp[0]; 65 unsigned long offset; 66 67 fbi = drm_fb_helper_alloc_info(helper); 68 if (IS_ERR(fbi)) { 69 DRM_DEV_ERROR(to_dma_dev(helper->dev), 70 "failed to allocate fb info.\n"); 71 return PTR_ERR(fbi); 72 } 73 74 fbi->fbops = &exynos_drm_fb_ops; 75 76 drm_fb_helper_fill_info(fbi, helper, sizes); 77 78 offset = fbi->var.xoffset * fb->format->cpp[0]; 79 offset += fbi->var.yoffset * fb->pitches[0]; 80 81 fbi->flags |= FBINFO_VIRTFB; 82 fbi->screen_buffer = exynos_gem->kvaddr + offset; 83 fbi->screen_size = size; 84 fbi->fix.smem_len = size; 85 86 return 0; 87 } 88 89 static const struct drm_fb_helper_funcs exynos_drm_fbdev_helper_funcs = { 90 }; 91 92 int exynos_drm_fbdev_driver_fbdev_probe(struct drm_fb_helper *helper, 93 struct drm_fb_helper_surface_size *sizes) 94 { 95 struct exynos_drm_gem *exynos_gem; 96 struct drm_device *dev = helper->dev; 97 struct drm_mode_fb_cmd2 mode_cmd = { 0 }; 98 unsigned long size; 99 int ret; 100 101 DRM_DEV_DEBUG_KMS(dev->dev, 102 "surface width(%d), height(%d) and bpp(%d\n", 103 sizes->surface_width, sizes->surface_height, 104 sizes->surface_bpp); 105 106 mode_cmd.width = sizes->surface_width; 107 mode_cmd.height = sizes->surface_height; 108 mode_cmd.pitches[0] = sizes->surface_width * (sizes->surface_bpp >> 3); 109 mode_cmd.pixel_format = drm_mode_legacy_fb_format(sizes->surface_bpp, 110 sizes->surface_depth); 111 112 size = mode_cmd.pitches[0] * mode_cmd.height; 113 114 exynos_gem = exynos_drm_gem_create(dev, EXYNOS_BO_WC, size, true); 115 if (IS_ERR(exynos_gem)) 116 return PTR_ERR(exynos_gem); 117 118 helper->fb = 119 exynos_drm_framebuffer_init(dev, &mode_cmd, &exynos_gem, 1); 120 if (IS_ERR(helper->fb)) { 121 DRM_DEV_ERROR(dev->dev, "failed to create drm framebuffer.\n"); 122 ret = PTR_ERR(helper->fb); 123 goto err_destroy_gem; 124 } 125 helper->funcs = &exynos_drm_fbdev_helper_funcs; 126 127 ret = exynos_drm_fbdev_update(helper, sizes, exynos_gem); 128 if (ret < 0) 129 goto err_destroy_framebuffer; 130 131 return 0; 132 133 err_destroy_framebuffer: 134 drm_framebuffer_cleanup(helper->fb); 135 helper->fb = NULL; 136 err_destroy_gem: 137 exynos_drm_gem_destroy(exynos_gem); 138 return ret; 139 } 140