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/fb.h> 11 #include <linux/kernel.h> 12 #include <linux/module.h> 13 14 #include <drm/drmP.h> 15 #include <drm/drm_fb_helper.h> 16 #include "armada_crtc.h" 17 #include "armada_drm.h" 18 #include "armada_fb.h" 19 #include "armada_gem.h" 20 21 static /*const*/ struct fb_ops armada_fb_ops = { 22 .owner = THIS_MODULE, 23 .fb_check_var = drm_fb_helper_check_var, 24 .fb_set_par = drm_fb_helper_set_par, 25 .fb_fillrect = cfb_fillrect, 26 .fb_copyarea = cfb_copyarea, 27 .fb_imageblit = cfb_imageblit, 28 .fb_pan_display = drm_fb_helper_pan_display, 29 .fb_blank = drm_fb_helper_blank, 30 .fb_setcmap = drm_fb_helper_setcmap, 31 .fb_debug_enter = drm_fb_helper_debug_enter, 32 .fb_debug_leave = drm_fb_helper_debug_leave, 33 }; 34 35 static int armada_fb_create(struct drm_fb_helper *fbh, 36 struct drm_fb_helper_surface_size *sizes) 37 { 38 struct drm_device *dev = fbh->dev; 39 struct drm_mode_fb_cmd2 mode; 40 struct armada_framebuffer *dfb; 41 struct armada_gem_object *obj; 42 struct fb_info *info; 43 int size, ret; 44 void *ptr; 45 46 memset(&mode, 0, sizeof(mode)); 47 mode.width = sizes->surface_width; 48 mode.height = sizes->surface_height; 49 mode.pitches[0] = armada_pitch(mode.width, sizes->surface_bpp); 50 mode.pixel_format = drm_mode_legacy_fb_format(sizes->surface_bpp, 51 sizes->surface_depth); 52 53 size = mode.pitches[0] * mode.height; 54 obj = armada_gem_alloc_private_object(dev, size); 55 if (!obj) { 56 DRM_ERROR("failed to allocate fb memory\n"); 57 return -ENOMEM; 58 } 59 60 ret = armada_gem_linear_back(dev, obj); 61 if (ret) { 62 drm_gem_object_unreference_unlocked(&obj->obj); 63 return ret; 64 } 65 66 ptr = armada_gem_map_object(dev, obj); 67 if (!ptr) { 68 drm_gem_object_unreference_unlocked(&obj->obj); 69 return -ENOMEM; 70 } 71 72 dfb = armada_framebuffer_create(dev, &mode, obj); 73 74 /* 75 * A reference is now held by the framebuffer object if 76 * successful, otherwise this drops the ref for the error path. 77 */ 78 drm_gem_object_unreference_unlocked(&obj->obj); 79 80 if (IS_ERR(dfb)) 81 return PTR_ERR(dfb); 82 83 info = framebuffer_alloc(0, dev->dev); 84 if (!info) { 85 ret = -ENOMEM; 86 goto err_fballoc; 87 } 88 89 ret = fb_alloc_cmap(&info->cmap, 256, 0); 90 if (ret) { 91 ret = -ENOMEM; 92 goto err_fbcmap; 93 } 94 95 strlcpy(info->fix.id, "armada-drmfb", sizeof(info->fix.id)); 96 info->par = fbh; 97 info->flags = FBINFO_DEFAULT | FBINFO_CAN_FORCE_OUTPUT; 98 info->fbops = &armada_fb_ops; 99 info->fix.smem_start = obj->phys_addr; 100 info->fix.smem_len = obj->obj.size; 101 info->screen_size = obj->obj.size; 102 info->screen_base = ptr; 103 fbh->fb = &dfb->fb; 104 fbh->fbdev = info; 105 drm_fb_helper_fill_fix(info, dfb->fb.pitches[0], dfb->fb.depth); 106 drm_fb_helper_fill_var(info, fbh, sizes->fb_width, sizes->fb_height); 107 108 DRM_DEBUG_KMS("allocated %dx%d %dbpp fb: 0x%08llx\n", 109 dfb->fb.width, dfb->fb.height, dfb->fb.bits_per_pixel, 110 (unsigned long long)obj->phys_addr); 111 112 return 0; 113 114 err_fbcmap: 115 framebuffer_release(info); 116 err_fballoc: 117 dfb->fb.funcs->destroy(&dfb->fb); 118 return ret; 119 } 120 121 static int armada_fb_probe(struct drm_fb_helper *fbh, 122 struct drm_fb_helper_surface_size *sizes) 123 { 124 int ret = 0; 125 126 if (!fbh->fb) { 127 ret = armada_fb_create(fbh, sizes); 128 if (ret == 0) 129 ret = 1; 130 } 131 return ret; 132 } 133 134 static const struct drm_fb_helper_funcs armada_fb_helper_funcs = { 135 .gamma_set = armada_drm_crtc_gamma_set, 136 .gamma_get = armada_drm_crtc_gamma_get, 137 .fb_probe = armada_fb_probe, 138 }; 139 140 int armada_fbdev_init(struct drm_device *dev) 141 { 142 struct armada_private *priv = dev->dev_private; 143 struct drm_fb_helper *fbh; 144 int ret; 145 146 fbh = devm_kzalloc(dev->dev, sizeof(*fbh), GFP_KERNEL); 147 if (!fbh) 148 return -ENOMEM; 149 150 priv->fbdev = fbh; 151 152 drm_fb_helper_prepare(dev, fbh, &armada_fb_helper_funcs); 153 154 ret = drm_fb_helper_init(dev, fbh, 1, 1); 155 if (ret) { 156 DRM_ERROR("failed to initialize drm fb helper\n"); 157 goto err_fb_helper; 158 } 159 160 ret = drm_fb_helper_single_add_all_connectors(fbh); 161 if (ret) { 162 DRM_ERROR("failed to add fb connectors\n"); 163 goto err_fb_setup; 164 } 165 166 ret = drm_fb_helper_initial_config(fbh, 32); 167 if (ret) { 168 DRM_ERROR("failed to set initial config\n"); 169 goto err_fb_setup; 170 } 171 172 return 0; 173 err_fb_setup: 174 drm_fb_helper_fini(fbh); 175 err_fb_helper: 176 priv->fbdev = NULL; 177 return ret; 178 } 179 180 void armada_fbdev_lastclose(struct drm_device *dev) 181 { 182 struct armada_private *priv = dev->dev_private; 183 184 if (priv->fbdev) 185 drm_fb_helper_restore_fbdev_mode_unlocked(priv->fbdev); 186 } 187 188 void armada_fbdev_fini(struct drm_device *dev) 189 { 190 struct armada_private *priv = dev->dev_private; 191 struct drm_fb_helper *fbh = priv->fbdev; 192 193 if (fbh) { 194 struct fb_info *info = fbh->fbdev; 195 196 if (info) { 197 unregister_framebuffer(info); 198 if (info->cmap.len) 199 fb_dealloc_cmap(&info->cmap); 200 framebuffer_release(info); 201 } 202 203 drm_fb_helper_fini(fbh); 204 205 if (fbh->fb) 206 fbh->fb->funcs->destroy(fbh->fb); 207 208 priv->fbdev = NULL; 209 } 210 } 211