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 sizes->surface_bpp = 32; 116 sizes->surface_depth = 24; 117 118 DBG("create fbdev: %dx%d@%d (%dx%d)", sizes->surface_width, 119 sizes->surface_height, sizes->surface_bpp, 120 sizes->fb_width, sizes->fb_height); 121 122 mode_cmd.pixel_format = drm_mode_legacy_fb_format(sizes->surface_bpp, 123 sizes->surface_depth); 124 125 mode_cmd.width = sizes->surface_width; 126 mode_cmd.height = sizes->surface_height; 127 128 mode_cmd.pitches[0] = align_pitch( 129 mode_cmd.width * ((sizes->surface_bpp + 7) / 8), 130 mode_cmd.width, sizes->surface_bpp); 131 132 fbdev->ywrap_enabled = priv->has_dmm && ywrap_enabled; 133 if (fbdev->ywrap_enabled) { 134 /* need to align pitch to page size if using DMM scrolling */ 135 mode_cmd.pitches[0] = PAGE_ALIGN(mode_cmd.pitches[0]); 136 } 137 138 /* allocate backing bo */ 139 gsize = (union omap_gem_size){ 140 .bytes = PAGE_ALIGN(mode_cmd.pitches[0] * mode_cmd.height), 141 }; 142 DBG("allocating %d bytes for fb %d", gsize.bytes, dev->primary->index); 143 fbdev->bo = omap_gem_new(dev, gsize, OMAP_BO_SCANOUT | OMAP_BO_WC); 144 if (!fbdev->bo) { 145 dev_err(dev->dev, "failed to allocate buffer object\n"); 146 ret = -ENOMEM; 147 goto fail; 148 } 149 150 fb = omap_framebuffer_init(dev, &mode_cmd, &fbdev->bo); 151 if (IS_ERR(fb)) { 152 dev_err(dev->dev, "failed to allocate fb\n"); 153 /* note: if fb creation failed, we can't rely on fb destroy 154 * to unref the bo: 155 */ 156 drm_gem_object_unreference_unlocked(fbdev->bo); 157 ret = PTR_ERR(fb); 158 goto fail; 159 } 160 161 /* note: this keeps the bo pinned.. which is perhaps not ideal, 162 * but is needed as long as we use fb_mmap() to mmap to userspace 163 * (since this happens using fix.smem_start). Possibly we could 164 * implement our own mmap using GEM mmap support to avoid this 165 * (non-tiled buffer doesn't need to be pinned for fbcon to write 166 * to it). Then we just need to be sure that we are able to re- 167 * pin it in case of an opps. 168 */ 169 ret = omap_gem_get_paddr(fbdev->bo, &paddr, true); 170 if (ret) { 171 dev_err(dev->dev, 172 "could not map (paddr)! Skipping framebuffer alloc\n"); 173 ret = -ENOMEM; 174 goto fail; 175 } 176 177 mutex_lock(&dev->struct_mutex); 178 179 fbi = drm_fb_helper_alloc_fbi(helper); 180 if (IS_ERR(fbi)) { 181 dev_err(dev->dev, "failed to allocate fb info\n"); 182 ret = PTR_ERR(fbi); 183 goto fail_unlock; 184 } 185 186 DBG("fbi=%p, dev=%p", fbi, dev); 187 188 fbdev->fb = fb; 189 helper->fb = fb; 190 191 fbi->par = helper; 192 fbi->flags = FBINFO_DEFAULT; 193 fbi->fbops = &omap_fb_ops; 194 195 strcpy(fbi->fix.id, MODULE_NAME); 196 197 drm_fb_helper_fill_fix(fbi, fb->pitches[0], fb->depth); 198 drm_fb_helper_fill_var(fbi, helper, sizes->fb_width, sizes->fb_height); 199 200 dev->mode_config.fb_base = paddr; 201 202 fbi->screen_base = omap_gem_vaddr(fbdev->bo); 203 fbi->screen_size = fbdev->bo->size; 204 fbi->fix.smem_start = paddr; 205 fbi->fix.smem_len = fbdev->bo->size; 206 207 /* if we have DMM, then we can use it for scrolling by just 208 * shuffling pages around in DMM rather than doing sw blit. 209 */ 210 if (fbdev->ywrap_enabled) { 211 DRM_INFO("Enabling DMM ywrap scrolling\n"); 212 fbi->flags |= FBINFO_HWACCEL_YWRAP | FBINFO_READS_FAST; 213 fbi->fix.ywrapstep = 1; 214 } 215 216 217 DBG("par=%p, %dx%d", fbi->par, fbi->var.xres, fbi->var.yres); 218 DBG("allocated %dx%d fb", fbdev->fb->width, fbdev->fb->height); 219 220 mutex_unlock(&dev->struct_mutex); 221 222 return 0; 223 224 fail_unlock: 225 mutex_unlock(&dev->struct_mutex); 226 fail: 227 228 if (ret) { 229 230 drm_fb_helper_release_fbi(helper); 231 232 if (fb) { 233 drm_framebuffer_unregister_private(fb); 234 drm_framebuffer_remove(fb); 235 } 236 } 237 238 return ret; 239 } 240 241 static const struct drm_fb_helper_funcs omap_fb_helper_funcs = { 242 .fb_probe = omap_fbdev_create, 243 }; 244 245 static struct drm_fb_helper *get_fb(struct fb_info *fbi) 246 { 247 if (!fbi || strcmp(fbi->fix.id, MODULE_NAME)) { 248 /* these are not the fb's you're looking for */ 249 return NULL; 250 } 251 return fbi->par; 252 } 253 254 /* initialize fbdev helper */ 255 struct drm_fb_helper *omap_fbdev_init(struct drm_device *dev) 256 { 257 struct omap_drm_private *priv = dev->dev_private; 258 struct omap_fbdev *fbdev = NULL; 259 struct drm_fb_helper *helper; 260 int ret = 0; 261 262 fbdev = kzalloc(sizeof(*fbdev), GFP_KERNEL); 263 if (!fbdev) 264 goto fail; 265 266 INIT_WORK(&fbdev->work, pan_worker); 267 268 helper = &fbdev->base; 269 270 drm_fb_helper_prepare(dev, helper, &omap_fb_helper_funcs); 271 272 ret = drm_fb_helper_init(dev, helper, 273 priv->num_crtcs, priv->num_connectors); 274 if (ret) { 275 dev_err(dev->dev, "could not init fbdev: ret=%d\n", ret); 276 goto fail; 277 } 278 279 ret = drm_fb_helper_single_add_all_connectors(helper); 280 if (ret) 281 goto fini; 282 283 /* disable all the possible outputs/crtcs before entering KMS mode */ 284 drm_helper_disable_unused_functions(dev); 285 286 ret = drm_fb_helper_initial_config(helper, 32); 287 if (ret) 288 goto fini; 289 290 priv->fbdev = helper; 291 292 return helper; 293 294 fini: 295 drm_fb_helper_fini(helper); 296 fail: 297 kfree(fbdev); 298 299 dev_warn(dev->dev, "omap_fbdev_init failed\n"); 300 /* well, limp along without an fbdev.. maybe X11 will work? */ 301 302 return NULL; 303 } 304 305 void omap_fbdev_free(struct drm_device *dev) 306 { 307 struct omap_drm_private *priv = dev->dev_private; 308 struct drm_fb_helper *helper = priv->fbdev; 309 struct omap_fbdev *fbdev; 310 311 DBG(); 312 313 drm_fb_helper_unregister_fbi(helper); 314 drm_fb_helper_release_fbi(helper); 315 316 drm_fb_helper_fini(helper); 317 318 fbdev = to_omap_fbdev(priv->fbdev); 319 320 /* release the ref taken in omap_fbdev_create() */ 321 omap_gem_put_paddr(fbdev->bo); 322 323 /* this will free the backing object */ 324 if (fbdev->fb) { 325 drm_framebuffer_unregister_private(fbdev->fb); 326 drm_framebuffer_remove(fbdev->fb); 327 } 328 329 kfree(fbdev); 330 331 priv->fbdev = NULL; 332 } 333