1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * Copyright (C) 2012 Russell King 4 * Written from the i915 driver. 5 */ 6 7 #include <linux/errno.h> 8 #include <linux/kernel.h> 9 #include <linux/module.h> 10 11 #include <drm/drm_fb_helper.h> 12 #include <drm/drm_fourcc.h> 13 14 #include "armada_crtc.h" 15 #include "armada_drm.h" 16 #include "armada_fb.h" 17 #include "armada_gem.h" 18 19 static const struct fb_ops armada_fb_ops = { 20 .owner = THIS_MODULE, 21 DRM_FB_HELPER_DEFAULT_OPS, 22 .fb_read = drm_fb_helper_cfb_read, 23 .fb_write = drm_fb_helper_cfb_write, 24 .fb_fillrect = drm_fb_helper_cfb_fillrect, 25 .fb_copyarea = drm_fb_helper_cfb_copyarea, 26 .fb_imageblit = drm_fb_helper_cfb_imageblit, 27 }; 28 29 static int armada_fbdev_create(struct drm_fb_helper *fbh, 30 struct drm_fb_helper_surface_size *sizes) 31 { 32 struct drm_device *dev = fbh->dev; 33 struct drm_mode_fb_cmd2 mode; 34 struct armada_framebuffer *dfb; 35 struct armada_gem_object *obj; 36 struct fb_info *info; 37 int size, ret; 38 void *ptr; 39 40 memset(&mode, 0, sizeof(mode)); 41 mode.width = sizes->surface_width; 42 mode.height = sizes->surface_height; 43 mode.pitches[0] = armada_pitch(mode.width, sizes->surface_bpp); 44 mode.pixel_format = drm_mode_legacy_fb_format(sizes->surface_bpp, 45 sizes->surface_depth); 46 47 size = mode.pitches[0] * mode.height; 48 obj = armada_gem_alloc_private_object(dev, size); 49 if (!obj) { 50 DRM_ERROR("failed to allocate fb memory\n"); 51 return -ENOMEM; 52 } 53 54 ret = armada_gem_linear_back(dev, obj); 55 if (ret) { 56 drm_gem_object_put(&obj->obj); 57 return ret; 58 } 59 60 ptr = armada_gem_map_object(dev, obj); 61 if (!ptr) { 62 drm_gem_object_put(&obj->obj); 63 return -ENOMEM; 64 } 65 66 dfb = armada_framebuffer_create(dev, &mode, obj); 67 68 /* 69 * A reference is now held by the framebuffer object if 70 * successful, otherwise this drops the ref for the error path. 71 */ 72 drm_gem_object_put(&obj->obj); 73 74 if (IS_ERR(dfb)) 75 return PTR_ERR(dfb); 76 77 info = drm_fb_helper_alloc_info(fbh); 78 if (IS_ERR(info)) { 79 ret = PTR_ERR(info); 80 goto err_fballoc; 81 } 82 83 info->fbops = &armada_fb_ops; 84 info->fix.smem_start = obj->phys_addr; 85 info->fix.smem_len = obj->obj.size; 86 info->screen_size = obj->obj.size; 87 info->screen_base = ptr; 88 fbh->fb = &dfb->fb; 89 90 drm_fb_helper_fill_info(info, fbh, sizes); 91 92 DRM_DEBUG_KMS("allocated %dx%d %dbpp fb: 0x%08llx\n", 93 dfb->fb.width, dfb->fb.height, dfb->fb.format->cpp[0] * 8, 94 (unsigned long long)obj->phys_addr); 95 96 return 0; 97 98 err_fballoc: 99 dfb->fb.funcs->destroy(&dfb->fb); 100 return ret; 101 } 102 103 static int armada_fb_probe(struct drm_fb_helper *fbh, 104 struct drm_fb_helper_surface_size *sizes) 105 { 106 int ret = 0; 107 108 if (!fbh->fb) { 109 ret = armada_fbdev_create(fbh, sizes); 110 if (ret == 0) 111 ret = 1; 112 } 113 return ret; 114 } 115 116 static const struct drm_fb_helper_funcs armada_fb_helper_funcs = { 117 .fb_probe = armada_fb_probe, 118 }; 119 120 int armada_fbdev_init(struct drm_device *dev) 121 { 122 struct armada_private *priv = drm_to_armada_dev(dev); 123 struct drm_fb_helper *fbh; 124 int ret; 125 126 fbh = devm_kzalloc(dev->dev, sizeof(*fbh), GFP_KERNEL); 127 if (!fbh) 128 return -ENOMEM; 129 130 priv->fbdev = fbh; 131 132 drm_fb_helper_prepare(dev, fbh, 32, &armada_fb_helper_funcs); 133 134 ret = drm_fb_helper_init(dev, fbh); 135 if (ret) { 136 DRM_ERROR("failed to initialize drm fb helper\n"); 137 goto err_fb_helper; 138 } 139 140 ret = drm_fb_helper_initial_config(fbh); 141 if (ret) { 142 DRM_ERROR("failed to set initial config\n"); 143 goto err_fb_setup; 144 } 145 146 return 0; 147 err_fb_setup: 148 drm_fb_helper_fini(fbh); 149 err_fb_helper: 150 drm_fb_helper_unprepare(fbh); 151 priv->fbdev = NULL; 152 return ret; 153 } 154 155 void armada_fbdev_fini(struct drm_device *dev) 156 { 157 struct armada_private *priv = drm_to_armada_dev(dev); 158 struct drm_fb_helper *fbh = priv->fbdev; 159 160 if (fbh) { 161 drm_fb_helper_unregister_info(fbh); 162 163 drm_fb_helper_fini(fbh); 164 165 if (fbh->fb) 166 fbh->fb->funcs->destroy(fbh->fb); 167 168 drm_fb_helper_unprepare(fbh); 169 170 priv->fbdev = NULL; 171 } 172 } 173