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/drm_fb_helper.h> 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_fillrect = drm_fb_helper_cfb_fillrect, 23 .fb_copyarea = drm_fb_helper_cfb_copyarea, 24 .fb_imageblit = drm_fb_helper_cfb_imageblit, 25 }; 26 27 static int armada_fbdev_create(struct drm_fb_helper *fbh, 28 struct drm_fb_helper_surface_size *sizes) 29 { 30 struct drm_device *dev = fbh->dev; 31 struct drm_mode_fb_cmd2 mode; 32 struct armada_framebuffer *dfb; 33 struct armada_gem_object *obj; 34 struct fb_info *info; 35 int size, ret; 36 void *ptr; 37 38 memset(&mode, 0, sizeof(mode)); 39 mode.width = sizes->surface_width; 40 mode.height = sizes->surface_height; 41 mode.pitches[0] = armada_pitch(mode.width, sizes->surface_bpp); 42 mode.pixel_format = drm_mode_legacy_fb_format(sizes->surface_bpp, 43 sizes->surface_depth); 44 45 size = mode.pitches[0] * mode.height; 46 obj = armada_gem_alloc_private_object(dev, size); 47 if (!obj) { 48 DRM_ERROR("failed to allocate fb memory\n"); 49 return -ENOMEM; 50 } 51 52 ret = armada_gem_linear_back(dev, obj); 53 if (ret) { 54 drm_gem_object_put_unlocked(&obj->obj); 55 return ret; 56 } 57 58 ptr = armada_gem_map_object(dev, obj); 59 if (!ptr) { 60 drm_gem_object_put_unlocked(&obj->obj); 61 return -ENOMEM; 62 } 63 64 dfb = armada_framebuffer_create(dev, &mode, obj); 65 66 /* 67 * A reference is now held by the framebuffer object if 68 * successful, otherwise this drops the ref for the error path. 69 */ 70 drm_gem_object_put_unlocked(&obj->obj); 71 72 if (IS_ERR(dfb)) 73 return PTR_ERR(dfb); 74 75 info = drm_fb_helper_alloc_fbi(fbh); 76 if (IS_ERR(info)) { 77 ret = PTR_ERR(info); 78 goto err_fballoc; 79 } 80 81 strlcpy(info->fix.id, "armada-drmfb", sizeof(info->fix.id)); 82 info->par = fbh; 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_fix(info, dfb->fb.pitches[0], 91 dfb->fb.format->depth); 92 drm_fb_helper_fill_var(info, fbh, sizes->fb_width, sizes->fb_height); 93 94 DRM_DEBUG_KMS("allocated %dx%d %dbpp fb: 0x%08llx\n", 95 dfb->fb.width, dfb->fb.height, dfb->fb.format->cpp[0] * 8, 96 (unsigned long long)obj->phys_addr); 97 98 return 0; 99 100 err_fballoc: 101 dfb->fb.funcs->destroy(&dfb->fb); 102 return ret; 103 } 104 105 static int armada_fb_probe(struct drm_fb_helper *fbh, 106 struct drm_fb_helper_surface_size *sizes) 107 { 108 int ret = 0; 109 110 if (!fbh->fb) { 111 ret = armada_fbdev_create(fbh, sizes); 112 if (ret == 0) 113 ret = 1; 114 } 115 return ret; 116 } 117 118 static const struct drm_fb_helper_funcs armada_fb_helper_funcs = { 119 .fb_probe = armada_fb_probe, 120 }; 121 122 int armada_fbdev_init(struct drm_device *dev) 123 { 124 struct armada_private *priv = dev->dev_private; 125 struct drm_fb_helper *fbh; 126 int ret; 127 128 fbh = devm_kzalloc(dev->dev, sizeof(*fbh), GFP_KERNEL); 129 if (!fbh) 130 return -ENOMEM; 131 132 priv->fbdev = fbh; 133 134 drm_fb_helper_prepare(dev, fbh, &armada_fb_helper_funcs); 135 136 ret = drm_fb_helper_init(dev, fbh, 1); 137 if (ret) { 138 DRM_ERROR("failed to initialize drm fb helper\n"); 139 goto err_fb_helper; 140 } 141 142 ret = drm_fb_helper_single_add_all_connectors(fbh); 143 if (ret) { 144 DRM_ERROR("failed to add fb connectors\n"); 145 goto err_fb_setup; 146 } 147 148 ret = drm_fb_helper_initial_config(fbh, 32); 149 if (ret) { 150 DRM_ERROR("failed to set initial config\n"); 151 goto err_fb_setup; 152 } 153 154 return 0; 155 err_fb_setup: 156 drm_fb_helper_fini(fbh); 157 err_fb_helper: 158 priv->fbdev = NULL; 159 return ret; 160 } 161 162 void armada_fbdev_fini(struct drm_device *dev) 163 { 164 struct armada_private *priv = dev->dev_private; 165 struct drm_fb_helper *fbh = priv->fbdev; 166 167 if (fbh) { 168 drm_fb_helper_unregister_fbi(fbh); 169 170 drm_fb_helper_fini(fbh); 171 172 if (fbh->fb) 173 fbh->fb->funcs->destroy(fbh->fb); 174 175 priv->fbdev = NULL; 176 } 177 } 178