1 /* 2 * drivers/gpu/drm/omapdrm/omap_fbdev.c 3 * 4 * Copyright (C) 2011 Texas Instruments 5 * Author: Rob Clark <rob@ti.com> 6 * 7 * This program is free software; you can redistribute it and/or modify it 8 * under the terms of the GNU General Public License version 2 as published by 9 * the Free Software Foundation. 10 * 11 * This program is distributed in the hope that it will be useful, but WITHOUT 12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for 14 * more details. 15 * 16 * You should have received a copy of the GNU General Public License along with 17 * this program. If not, see <http://www.gnu.org/licenses/>. 18 */ 19 20 #include <drm/drm_crtc.h> 21 #include <drm/drm_fb_helper.h> 22 23 #include "omap_drv.h" 24 25 MODULE_PARM_DESC(ywrap, "Enable ywrap scrolling (omap44xx and later, default 'y')"); 26 static bool ywrap_enabled = true; 27 module_param_named(ywrap, ywrap_enabled, bool, 0644); 28 29 /* 30 * fbdev funcs, to implement legacy fbdev interface on top of drm driver 31 */ 32 33 #define to_omap_fbdev(x) container_of(x, struct omap_fbdev, base) 34 35 struct omap_fbdev { 36 struct drm_fb_helper base; 37 struct drm_framebuffer *fb; 38 struct drm_gem_object *bo; 39 bool ywrap_enabled; 40 41 /* for deferred dmm roll when getting called in atomic ctx */ 42 struct work_struct work; 43 }; 44 45 static struct drm_fb_helper *get_fb(struct fb_info *fbi); 46 47 static void pan_worker(struct work_struct *work) 48 { 49 struct omap_fbdev *fbdev = container_of(work, struct omap_fbdev, work); 50 struct fb_info *fbi = fbdev->base.fbdev; 51 int npages; 52 53 /* DMM roll shifts in 4K pages: */ 54 npages = fbi->fix.line_length >> PAGE_SHIFT; 55 omap_gem_roll(fbdev->bo, fbi->var.yoffset * npages); 56 } 57 58 static int omap_fbdev_pan_display(struct fb_var_screeninfo *var, 59 struct fb_info *fbi) 60 { 61 struct drm_fb_helper *helper = get_fb(fbi); 62 struct omap_fbdev *fbdev = to_omap_fbdev(helper); 63 64 if (!helper) 65 goto fallback; 66 67 if (!fbdev->ywrap_enabled) 68 goto fallback; 69 70 if (drm_can_sleep()) { 71 pan_worker(&fbdev->work); 72 } else { 73 struct omap_drm_private *priv = helper->dev->dev_private; 74 queue_work(priv->wq, &fbdev->work); 75 } 76 77 return 0; 78 79 fallback: 80 return drm_fb_helper_pan_display(var, fbi); 81 } 82 83 static struct fb_ops omap_fb_ops = { 84 .owner = THIS_MODULE, 85 86 /* Note: to properly handle manual update displays, we wrap the 87 * basic fbdev ops which write to the framebuffer 88 */ 89 .fb_read = drm_fb_helper_sys_read, 90 .fb_write = drm_fb_helper_sys_write, 91 .fb_fillrect = drm_fb_helper_sys_fillrect, 92 .fb_copyarea = drm_fb_helper_sys_copyarea, 93 .fb_imageblit = drm_fb_helper_sys_imageblit, 94 95 .fb_check_var = drm_fb_helper_check_var, 96 .fb_set_par = drm_fb_helper_set_par, 97 .fb_pan_display = omap_fbdev_pan_display, 98 .fb_blank = drm_fb_helper_blank, 99 .fb_setcmap = drm_fb_helper_setcmap, 100 }; 101 102 static int omap_fbdev_create(struct drm_fb_helper *helper, 103 struct drm_fb_helper_surface_size *sizes) 104 { 105 struct omap_fbdev *fbdev = to_omap_fbdev(helper); 106 struct drm_device *dev = helper->dev; 107 struct omap_drm_private *priv = dev->dev_private; 108 struct drm_framebuffer *fb = NULL; 109 union omap_gem_size gsize; 110 struct fb_info *fbi = NULL; 111 struct drm_mode_fb_cmd2 mode_cmd = {0}; 112 dma_addr_t paddr; 113 int ret; 114 115 /* only doing ARGB32 since this is what is needed to alpha-blend 116 * with video overlays: 117 */ 118 sizes->surface_bpp = 32; 119 sizes->surface_depth = 32; 120 121 DBG("create fbdev: %dx%d@%d (%dx%d)", sizes->surface_width, 122 sizes->surface_height, sizes->surface_bpp, 123 sizes->fb_width, sizes->fb_height); 124 125 mode_cmd.pixel_format = drm_mode_legacy_fb_format(sizes->surface_bpp, 126 sizes->surface_depth); 127 128 mode_cmd.width = sizes->surface_width; 129 mode_cmd.height = sizes->surface_height; 130 131 mode_cmd.pitches[0] = align_pitch( 132 mode_cmd.width * ((sizes->surface_bpp + 7) / 8), 133 mode_cmd.width, sizes->surface_bpp); 134 135 fbdev->ywrap_enabled = priv->has_dmm && ywrap_enabled; 136 if (fbdev->ywrap_enabled) { 137 /* need to align pitch to page size if using DMM scrolling */ 138 mode_cmd.pitches[0] = PAGE_ALIGN(mode_cmd.pitches[0]); 139 } 140 141 /* allocate backing bo */ 142 gsize = (union omap_gem_size){ 143 .bytes = PAGE_ALIGN(mode_cmd.pitches[0] * mode_cmd.height), 144 }; 145 DBG("allocating %d bytes for fb %d", gsize.bytes, dev->primary->index); 146 fbdev->bo = omap_gem_new(dev, gsize, OMAP_BO_SCANOUT | OMAP_BO_WC); 147 if (!fbdev->bo) { 148 dev_err(dev->dev, "failed to allocate buffer object\n"); 149 ret = -ENOMEM; 150 goto fail; 151 } 152 153 fb = omap_framebuffer_init(dev, &mode_cmd, &fbdev->bo); 154 if (IS_ERR(fb)) { 155 dev_err(dev->dev, "failed to allocate fb\n"); 156 /* note: if fb creation failed, we can't rely on fb destroy 157 * to unref the bo: 158 */ 159 drm_gem_object_unreference(fbdev->bo); 160 ret = PTR_ERR(fb); 161 goto fail; 162 } 163 164 /* note: this keeps the bo pinned.. which is perhaps not ideal, 165 * but is needed as long as we use fb_mmap() to mmap to userspace 166 * (since this happens using fix.smem_start). Possibly we could 167 * implement our own mmap using GEM mmap support to avoid this 168 * (non-tiled buffer doesn't need to be pinned for fbcon to write 169 * to it). Then we just need to be sure that we are able to re- 170 * pin it in case of an opps. 171 */ 172 ret = omap_gem_get_paddr(fbdev->bo, &paddr, true); 173 if (ret) { 174 dev_err(dev->dev, 175 "could not map (paddr)! Skipping framebuffer alloc\n"); 176 ret = -ENOMEM; 177 goto fail; 178 } 179 180 mutex_lock(&dev->struct_mutex); 181 182 fbi = drm_fb_helper_alloc_fbi(helper); 183 if (IS_ERR(fbi)) { 184 dev_err(dev->dev, "failed to allocate fb info\n"); 185 ret = PTR_ERR(fbi); 186 goto fail_unlock; 187 } 188 189 DBG("fbi=%p, dev=%p", fbi, dev); 190 191 fbdev->fb = fb; 192 helper->fb = fb; 193 194 fbi->par = helper; 195 fbi->flags = FBINFO_DEFAULT; 196 fbi->fbops = &omap_fb_ops; 197 198 strcpy(fbi->fix.id, MODULE_NAME); 199 200 drm_fb_helper_fill_fix(fbi, fb->pitches[0], fb->depth); 201 drm_fb_helper_fill_var(fbi, helper, sizes->fb_width, sizes->fb_height); 202 203 dev->mode_config.fb_base = paddr; 204 205 fbi->screen_base = omap_gem_vaddr(fbdev->bo); 206 fbi->screen_size = fbdev->bo->size; 207 fbi->fix.smem_start = paddr; 208 fbi->fix.smem_len = fbdev->bo->size; 209 210 /* if we have DMM, then we can use it for scrolling by just 211 * shuffling pages around in DMM rather than doing sw blit. 212 */ 213 if (fbdev->ywrap_enabled) { 214 DRM_INFO("Enabling DMM ywrap scrolling\n"); 215 fbi->flags |= FBINFO_HWACCEL_YWRAP | FBINFO_READS_FAST; 216 fbi->fix.ywrapstep = 1; 217 } 218 219 220 DBG("par=%p, %dx%d", fbi->par, fbi->var.xres, fbi->var.yres); 221 DBG("allocated %dx%d fb", fbdev->fb->width, fbdev->fb->height); 222 223 mutex_unlock(&dev->struct_mutex); 224 225 return 0; 226 227 fail_unlock: 228 mutex_unlock(&dev->struct_mutex); 229 fail: 230 231 if (ret) { 232 233 drm_fb_helper_release_fbi(helper); 234 235 if (fb) { 236 drm_framebuffer_unregister_private(fb); 237 drm_framebuffer_remove(fb); 238 } 239 } 240 241 return ret; 242 } 243 244 static const struct drm_fb_helper_funcs omap_fb_helper_funcs = { 245 .fb_probe = omap_fbdev_create, 246 }; 247 248 static struct drm_fb_helper *get_fb(struct fb_info *fbi) 249 { 250 if (!fbi || strcmp(fbi->fix.id, MODULE_NAME)) { 251 /* these are not the fb's you're looking for */ 252 return NULL; 253 } 254 return fbi->par; 255 } 256 257 /* initialize fbdev helper */ 258 struct drm_fb_helper *omap_fbdev_init(struct drm_device *dev) 259 { 260 struct omap_drm_private *priv = dev->dev_private; 261 struct omap_fbdev *fbdev = NULL; 262 struct drm_fb_helper *helper; 263 int ret = 0; 264 265 fbdev = kzalloc(sizeof(*fbdev), GFP_KERNEL); 266 if (!fbdev) 267 goto fail; 268 269 INIT_WORK(&fbdev->work, pan_worker); 270 271 helper = &fbdev->base; 272 273 drm_fb_helper_prepare(dev, helper, &omap_fb_helper_funcs); 274 275 ret = drm_fb_helper_init(dev, helper, 276 priv->num_crtcs, priv->num_connectors); 277 if (ret) { 278 dev_err(dev->dev, "could not init fbdev: ret=%d\n", ret); 279 goto fail; 280 } 281 282 ret = drm_fb_helper_single_add_all_connectors(helper); 283 if (ret) 284 goto fini; 285 286 /* disable all the possible outputs/crtcs before entering KMS mode */ 287 drm_helper_disable_unused_functions(dev); 288 289 ret = drm_fb_helper_initial_config(helper, 32); 290 if (ret) 291 goto fini; 292 293 priv->fbdev = helper; 294 295 return helper; 296 297 fini: 298 drm_fb_helper_fini(helper); 299 fail: 300 kfree(fbdev); 301 return NULL; 302 } 303 304 void omap_fbdev_free(struct drm_device *dev) 305 { 306 struct omap_drm_private *priv = dev->dev_private; 307 struct drm_fb_helper *helper = priv->fbdev; 308 struct omap_fbdev *fbdev; 309 310 DBG(); 311 312 drm_fb_helper_unregister_fbi(helper); 313 drm_fb_helper_release_fbi(helper); 314 315 drm_fb_helper_fini(helper); 316 317 fbdev = to_omap_fbdev(priv->fbdev); 318 319 /* release the ref taken in omap_fbdev_create() */ 320 omap_gem_put_paddr(fbdev->bo); 321 322 /* this will free the backing object */ 323 if (fbdev->fb) { 324 drm_framebuffer_unregister_private(fbdev->fb); 325 drm_framebuffer_remove(fbdev->fb); 326 } 327 328 kfree(fbdev); 329 330 priv->fbdev = NULL; 331 } 332