1 /* 2 * Copyright (C) 2012 Russell King 3 * Written from the i915 driver. 4 * 5 * This program is free software; you can redistribute it and/or modify 6 * it under the terms of the GNU General Public License version 2 as 7 * published by the Free Software Foundation. 8 */ 9 #include <linux/errno.h> 10 #include <linux/kernel.h> 11 #include <linux/module.h> 12 13 #include <drm/drmP.h> 14 #include <drm/drm_fb_helper.h> 15 #include "armada_crtc.h" 16 #include "armada_drm.h" 17 #include "armada_fb.h" 18 #include "armada_gem.h" 19 20 static /*const*/ struct fb_ops armada_fb_ops = { 21 .owner = THIS_MODULE, 22 DRM_FB_HELPER_DEFAULT_OPS, 23 .fb_fillrect = drm_fb_helper_cfb_fillrect, 24 .fb_copyarea = drm_fb_helper_cfb_copyarea, 25 .fb_imageblit = drm_fb_helper_cfb_imageblit, 26 }; 27 28 static int armada_fb_create(struct drm_fb_helper *fbh, 29 struct drm_fb_helper_surface_size *sizes) 30 { 31 struct drm_device *dev = fbh->dev; 32 struct drm_mode_fb_cmd2 mode; 33 struct armada_framebuffer *dfb; 34 struct armada_gem_object *obj; 35 struct fb_info *info; 36 int size, ret; 37 void *ptr; 38 39 memset(&mode, 0, sizeof(mode)); 40 mode.width = sizes->surface_width; 41 mode.height = sizes->surface_height; 42 mode.pitches[0] = armada_pitch(mode.width, sizes->surface_bpp); 43 mode.pixel_format = drm_mode_legacy_fb_format(sizes->surface_bpp, 44 sizes->surface_depth); 45 46 size = mode.pitches[0] * mode.height; 47 obj = armada_gem_alloc_private_object(dev, size); 48 if (!obj) { 49 DRM_ERROR("failed to allocate fb memory\n"); 50 return -ENOMEM; 51 } 52 53 ret = armada_gem_linear_back(dev, obj); 54 if (ret) { 55 drm_gem_object_unreference_unlocked(&obj->obj); 56 return ret; 57 } 58 59 ptr = armada_gem_map_object(dev, obj); 60 if (!ptr) { 61 drm_gem_object_unreference_unlocked(&obj->obj); 62 return -ENOMEM; 63 } 64 65 dfb = armada_framebuffer_create(dev, &mode, obj); 66 67 /* 68 * A reference is now held by the framebuffer object if 69 * successful, otherwise this drops the ref for the error path. 70 */ 71 drm_gem_object_unreference_unlocked(&obj->obj); 72 73 if (IS_ERR(dfb)) 74 return PTR_ERR(dfb); 75 76 info = drm_fb_helper_alloc_fbi(fbh); 77 if (IS_ERR(info)) { 78 ret = PTR_ERR(info); 79 goto err_fballoc; 80 } 81 82 strlcpy(info->fix.id, "armada-drmfb", sizeof(info->fix.id)); 83 info->par = fbh; 84 info->fbops = &armada_fb_ops; 85 info->fix.smem_start = obj->phys_addr; 86 info->fix.smem_len = obj->obj.size; 87 info->screen_size = obj->obj.size; 88 info->screen_base = ptr; 89 fbh->fb = &dfb->fb; 90 91 drm_fb_helper_fill_fix(info, dfb->fb.pitches[0], 92 dfb->fb.format->depth); 93 drm_fb_helper_fill_var(info, fbh, sizes->fb_width, sizes->fb_height); 94 95 DRM_DEBUG_KMS("allocated %dx%d %dbpp fb: 0x%08llx\n", 96 dfb->fb.width, dfb->fb.height, dfb->fb.format->cpp[0] * 8, 97 (unsigned long long)obj->phys_addr); 98 99 return 0; 100 101 err_fballoc: 102 dfb->fb.funcs->destroy(&dfb->fb); 103 return ret; 104 } 105 106 static int armada_fb_probe(struct drm_fb_helper *fbh, 107 struct drm_fb_helper_surface_size *sizes) 108 { 109 int ret = 0; 110 111 if (!fbh->fb) { 112 ret = armada_fb_create(fbh, sizes); 113 if (ret == 0) 114 ret = 1; 115 } 116 return ret; 117 } 118 119 static const struct drm_fb_helper_funcs armada_fb_helper_funcs = { 120 .fb_probe = armada_fb_probe, 121 }; 122 123 int armada_fbdev_init(struct drm_device *dev) 124 { 125 struct armada_private *priv = dev->dev_private; 126 struct drm_fb_helper *fbh; 127 int ret; 128 129 fbh = devm_kzalloc(dev->dev, sizeof(*fbh), GFP_KERNEL); 130 if (!fbh) 131 return -ENOMEM; 132 133 priv->fbdev = fbh; 134 135 drm_fb_helper_prepare(dev, fbh, &armada_fb_helper_funcs); 136 137 ret = drm_fb_helper_init(dev, fbh, 1); 138 if (ret) { 139 DRM_ERROR("failed to initialize drm fb helper\n"); 140 goto err_fb_helper; 141 } 142 143 ret = drm_fb_helper_single_add_all_connectors(fbh); 144 if (ret) { 145 DRM_ERROR("failed to add fb connectors\n"); 146 goto err_fb_setup; 147 } 148 149 ret = drm_fb_helper_initial_config(fbh, 32); 150 if (ret) { 151 DRM_ERROR("failed to set initial config\n"); 152 goto err_fb_setup; 153 } 154 155 return 0; 156 err_fb_setup: 157 drm_fb_helper_fini(fbh); 158 err_fb_helper: 159 priv->fbdev = NULL; 160 return ret; 161 } 162 163 void armada_fbdev_lastclose(struct drm_device *dev) 164 { 165 struct armada_private *priv = dev->dev_private; 166 167 if (priv->fbdev) 168 drm_fb_helper_restore_fbdev_mode_unlocked(priv->fbdev); 169 } 170 171 void armada_fbdev_fini(struct drm_device *dev) 172 { 173 struct armada_private *priv = dev->dev_private; 174 struct drm_fb_helper *fbh = priv->fbdev; 175 176 if (fbh) { 177 drm_fb_helper_unregister_fbi(fbh); 178 179 drm_fb_helper_fini(fbh); 180 181 if (fbh->fb) 182 fbh->fb->funcs->destroy(fbh->fb); 183 184 priv->fbdev = NULL; 185 } 186 } 187