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/drm_print.h> 20 #include <drm/exynos_drm.h> 21 22 #include "exynos_drm_drv.h" 23 #include "exynos_drm_fb.h" 24 #include "exynos_drm_fbdev.h" 25 #include "exynos_drm_gem.h" 26 27 #define MAX_CONNECTOR 4 28 29 static int exynos_drm_fb_mmap(struct fb_info *info, struct vm_area_struct *vma) 30 { 31 struct drm_fb_helper *helper = info->par; 32 struct drm_gem_object *obj = drm_gem_fb_get_obj(helper->fb, 0); 33 34 return drm_gem_prime_mmap(obj, vma); 35 } 36 37 static void exynos_drm_fb_destroy(struct fb_info *info) 38 { 39 struct drm_fb_helper *fb_helper = info->par; 40 41 drm_fb_helper_fini(fb_helper); 42 43 drm_client_buffer_delete(fb_helper->buffer); 44 drm_client_release(&fb_helper->client); 45 } 46 47 static const struct fb_ops exynos_drm_fb_ops = { 48 .owner = THIS_MODULE, 49 __FB_DEFAULT_DMAMEM_OPS_RDWR, 50 DRM_FB_HELPER_DEFAULT_OPS, 51 __FB_DEFAULT_DMAMEM_OPS_DRAW, 52 .fb_mmap = exynos_drm_fb_mmap, 53 .fb_destroy = exynos_drm_fb_destroy, 54 }; 55 56 static const struct drm_fb_helper_funcs exynos_drm_fbdev_helper_funcs = { 57 }; 58 59 int exynos_drm_fbdev_driver_fbdev_probe(struct drm_fb_helper *helper, 60 struct drm_fb_helper_surface_size *sizes) 61 { 62 struct drm_client_dev *client = &helper->client; 63 struct drm_device *dev = client->dev; 64 struct drm_file *file = client->file; 65 struct fb_info *info = helper->info; 66 u32 fourcc, pitch; 67 u64 size; 68 const struct drm_format_info *format; 69 struct exynos_drm_gem *exynos_gem; 70 struct drm_gem_object *obj; 71 struct drm_client_buffer *buffer; 72 u32 handle; 73 int ret; 74 75 DRM_DEV_DEBUG_KMS(dev->dev, 76 "surface width(%d), height(%d) and bpp(%d\n", 77 sizes->surface_width, sizes->surface_height, 78 sizes->surface_bpp); 79 80 fourcc = drm_mode_legacy_fb_format(sizes->surface_bpp, sizes->surface_depth); 81 if (fourcc == DRM_FORMAT_INVALID) 82 return -EINVAL; 83 format = drm_get_format_info(dev, fourcc, DRM_FORMAT_MOD_LINEAR); 84 if (!format) 85 return -EINVAL; 86 pitch = drm_format_info_min_pitch(format, 0, sizes->surface_width); 87 if (!pitch) 88 return -EINVAL; 89 if (check_mul_overflow(pitch, sizes->surface_height, &size)) 90 return -EINVAL; 91 size = ALIGN(size, PAGE_SIZE); 92 if (size < PAGE_SIZE) 93 return -EINVAL; 94 95 exynos_gem = exynos_drm_gem_create(dev, EXYNOS_BO_WC, size, true); 96 if (IS_ERR(exynos_gem)) 97 return PTR_ERR(exynos_gem); 98 obj = &exynos_gem->base; 99 100 ret = drm_gem_handle_create(file, obj, &handle); 101 if (ret) 102 goto err_drm_gem_object_put; 103 104 buffer = drm_client_buffer_create(client, sizes->surface_width, sizes->surface_height, 105 fourcc, handle, pitch); 106 if (IS_ERR(buffer)) { 107 ret = PTR_ERR(buffer); 108 goto err_drm_gem_handle_delete; 109 } 110 111 helper->funcs = &exynos_drm_fbdev_helper_funcs; 112 helper->buffer = buffer; 113 helper->fb = buffer->fb; 114 115 info->fbops = &exynos_drm_fb_ops; 116 117 drm_fb_helper_fill_info(info, helper, sizes); 118 119 info->flags |= FBINFO_VIRTFB; 120 info->screen_buffer = exynos_gem->kvaddr; 121 info->screen_size = obj->size; 122 info->fix.smem_len = obj->size; 123 124 /* The handle is only needed for creating the framebuffer. */ 125 drm_gem_handle_delete(file, handle); 126 127 /* The framebuffer still holds a reference on the GEM object. */ 128 drm_gem_object_put(obj); 129 130 return 0; 131 132 err_drm_gem_handle_delete: 133 drm_gem_handle_delete(file, handle); 134 err_drm_gem_object_put: 135 drm_gem_object_put(obj); 136 return ret; 137 } 138