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 DRM_FB_HELPER_DEFAULT_OPS, 86 87 /* Note: to properly handle manual update displays, we wrap the 88 * basic fbdev ops which write to the framebuffer 89 */ 90 .fb_read = drm_fb_helper_sys_read, 91 .fb_write = drm_fb_helper_sys_write, 92 .fb_fillrect = drm_fb_helper_sys_fillrect, 93 .fb_copyarea = drm_fb_helper_sys_copyarea, 94 .fb_imageblit = drm_fb_helper_sys_imageblit, 95 96 .fb_pan_display = omap_fbdev_pan_display, 97 }; 98 99 static int omap_fbdev_create(struct drm_fb_helper *helper, 100 struct drm_fb_helper_surface_size *sizes) 101 { 102 struct omap_fbdev *fbdev = to_omap_fbdev(helper); 103 struct drm_device *dev = helper->dev; 104 struct omap_drm_private *priv = dev->dev_private; 105 struct drm_framebuffer *fb = NULL; 106 union omap_gem_size gsize; 107 struct fb_info *fbi = NULL; 108 struct drm_mode_fb_cmd2 mode_cmd = {0}; 109 dma_addr_t dma_addr; 110 int ret; 111 112 sizes->surface_bpp = 32; 113 sizes->surface_depth = 24; 114 115 DBG("create fbdev: %dx%d@%d (%dx%d)", sizes->surface_width, 116 sizes->surface_height, sizes->surface_bpp, 117 sizes->fb_width, sizes->fb_height); 118 119 mode_cmd.pixel_format = drm_mode_legacy_fb_format(sizes->surface_bpp, 120 sizes->surface_depth); 121 122 mode_cmd.width = sizes->surface_width; 123 mode_cmd.height = sizes->surface_height; 124 125 mode_cmd.pitches[0] = 126 DIV_ROUND_UP(mode_cmd.width * sizes->surface_bpp, 8); 127 128 fbdev->ywrap_enabled = priv->has_dmm && ywrap_enabled; 129 if (fbdev->ywrap_enabled) { 130 /* need to align pitch to page size if using DMM scrolling */ 131 mode_cmd.pitches[0] = PAGE_ALIGN(mode_cmd.pitches[0]); 132 } 133 134 /* allocate backing bo */ 135 gsize = (union omap_gem_size){ 136 .bytes = PAGE_ALIGN(mode_cmd.pitches[0] * mode_cmd.height), 137 }; 138 DBG("allocating %d bytes for fb %d", gsize.bytes, dev->primary->index); 139 fbdev->bo = omap_gem_new(dev, gsize, OMAP_BO_SCANOUT | OMAP_BO_WC); 140 if (!fbdev->bo) { 141 dev_err(dev->dev, "failed to allocate buffer object\n"); 142 ret = -ENOMEM; 143 goto fail; 144 } 145 146 fb = omap_framebuffer_init(dev, &mode_cmd, &fbdev->bo); 147 if (IS_ERR(fb)) { 148 dev_err(dev->dev, "failed to allocate fb\n"); 149 /* note: if fb creation failed, we can't rely on fb destroy 150 * to unref the bo: 151 */ 152 drm_gem_object_unreference_unlocked(fbdev->bo); 153 ret = PTR_ERR(fb); 154 goto fail; 155 } 156 157 /* note: this keeps the bo pinned.. which is perhaps not ideal, 158 * but is needed as long as we use fb_mmap() to mmap to userspace 159 * (since this happens using fix.smem_start). Possibly we could 160 * implement our own mmap using GEM mmap support to avoid this 161 * (non-tiled buffer doesn't need to be pinned for fbcon to write 162 * to it). Then we just need to be sure that we are able to re- 163 * pin it in case of an opps. 164 */ 165 ret = omap_gem_pin(fbdev->bo, &dma_addr); 166 if (ret) { 167 dev_err(dev->dev, "could not pin framebuffer\n"); 168 ret = -ENOMEM; 169 goto fail; 170 } 171 172 mutex_lock(&dev->struct_mutex); 173 174 fbi = drm_fb_helper_alloc_fbi(helper); 175 if (IS_ERR(fbi)) { 176 dev_err(dev->dev, "failed to allocate fb info\n"); 177 ret = PTR_ERR(fbi); 178 goto fail_unlock; 179 } 180 181 DBG("fbi=%p, dev=%p", fbi, dev); 182 183 fbdev->fb = fb; 184 helper->fb = fb; 185 186 fbi->par = helper; 187 fbi->fbops = &omap_fb_ops; 188 189 strcpy(fbi->fix.id, MODULE_NAME); 190 191 drm_fb_helper_fill_fix(fbi, fb->pitches[0], fb->format->depth); 192 drm_fb_helper_fill_var(fbi, helper, sizes->fb_width, sizes->fb_height); 193 194 dev->mode_config.fb_base = dma_addr; 195 196 fbi->screen_base = omap_gem_vaddr(fbdev->bo); 197 fbi->screen_size = fbdev->bo->size; 198 fbi->fix.smem_start = dma_addr; 199 fbi->fix.smem_len = fbdev->bo->size; 200 201 /* if we have DMM, then we can use it for scrolling by just 202 * shuffling pages around in DMM rather than doing sw blit. 203 */ 204 if (fbdev->ywrap_enabled) { 205 DRM_INFO("Enabling DMM ywrap scrolling\n"); 206 fbi->flags |= FBINFO_HWACCEL_YWRAP | FBINFO_READS_FAST; 207 fbi->fix.ywrapstep = 1; 208 } 209 210 211 DBG("par=%p, %dx%d", fbi->par, fbi->var.xres, fbi->var.yres); 212 DBG("allocated %dx%d fb", fbdev->fb->width, fbdev->fb->height); 213 214 mutex_unlock(&dev->struct_mutex); 215 216 return 0; 217 218 fail_unlock: 219 mutex_unlock(&dev->struct_mutex); 220 fail: 221 222 if (ret) { 223 if (fb) 224 drm_framebuffer_remove(fb); 225 } 226 227 return ret; 228 } 229 230 static const struct drm_fb_helper_funcs omap_fb_helper_funcs = { 231 .fb_probe = omap_fbdev_create, 232 }; 233 234 static struct drm_fb_helper *get_fb(struct fb_info *fbi) 235 { 236 if (!fbi || strcmp(fbi->fix.id, MODULE_NAME)) { 237 /* these are not the fb's you're looking for */ 238 return NULL; 239 } 240 return fbi->par; 241 } 242 243 /* initialize fbdev helper */ 244 struct drm_fb_helper *omap_fbdev_init(struct drm_device *dev) 245 { 246 struct omap_drm_private *priv = dev->dev_private; 247 struct omap_fbdev *fbdev = NULL; 248 struct drm_fb_helper *helper; 249 int ret = 0; 250 251 fbdev = kzalloc(sizeof(*fbdev), GFP_KERNEL); 252 if (!fbdev) 253 goto fail; 254 255 INIT_WORK(&fbdev->work, pan_worker); 256 257 helper = &fbdev->base; 258 259 drm_fb_helper_prepare(dev, helper, &omap_fb_helper_funcs); 260 261 ret = drm_fb_helper_init(dev, helper, priv->num_connectors); 262 if (ret) { 263 dev_err(dev->dev, "could not init fbdev: ret=%d\n", ret); 264 goto fail; 265 } 266 267 ret = drm_fb_helper_single_add_all_connectors(helper); 268 if (ret) 269 goto fini; 270 271 ret = drm_fb_helper_initial_config(helper, 32); 272 if (ret) 273 goto fini; 274 275 priv->fbdev = helper; 276 277 return helper; 278 279 fini: 280 drm_fb_helper_fini(helper); 281 fail: 282 kfree(fbdev); 283 284 dev_warn(dev->dev, "omap_fbdev_init failed\n"); 285 /* well, limp along without an fbdev.. maybe X11 will work? */ 286 287 return NULL; 288 } 289 290 void omap_fbdev_free(struct drm_device *dev) 291 { 292 struct omap_drm_private *priv = dev->dev_private; 293 struct drm_fb_helper *helper = priv->fbdev; 294 struct omap_fbdev *fbdev; 295 296 DBG(); 297 298 drm_fb_helper_unregister_fbi(helper); 299 300 drm_fb_helper_fini(helper); 301 302 fbdev = to_omap_fbdev(priv->fbdev); 303 304 /* unpin the GEM object pinned in omap_fbdev_create() */ 305 omap_gem_unpin(fbdev->bo); 306 307 /* this will free the backing object */ 308 if (fbdev->fb) 309 drm_framebuffer_remove(fbdev->fb); 310 311 kfree(fbdev); 312 313 priv->fbdev = NULL; 314 } 315