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