1 /* 2 * Copyright (C) 2011 Texas Instruments Incorporated - http://www.ti.com/ 3 * Author: Rob Clark <rob@ti.com> 4 * 5 * This program is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 as published by 7 * the Free Software Foundation. 8 * 9 * This program is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for 12 * more details. 13 * 14 * You should have received a copy of the GNU General Public License along with 15 * this program. If not, see <http://www.gnu.org/licenses/>. 16 */ 17 18 #include <drm/drm_crtc.h> 19 #include <drm/drm_fb_helper.h> 20 21 #include "omap_drv.h" 22 23 MODULE_PARM_DESC(ywrap, "Enable ywrap scrolling (omap44xx and later, default 'y')"); 24 static bool ywrap_enabled = true; 25 module_param_named(ywrap, ywrap_enabled, bool, 0644); 26 27 /* 28 * fbdev funcs, to implement legacy fbdev interface on top of drm driver 29 */ 30 31 #define to_omap_fbdev(x) container_of(x, struct omap_fbdev, base) 32 33 struct omap_fbdev { 34 struct drm_fb_helper base; 35 struct drm_framebuffer *fb; 36 struct drm_gem_object *bo; 37 bool ywrap_enabled; 38 39 /* for deferred dmm roll when getting called in atomic ctx */ 40 struct work_struct work; 41 }; 42 43 static struct drm_fb_helper *get_fb(struct fb_info *fbi); 44 45 static void pan_worker(struct work_struct *work) 46 { 47 struct omap_fbdev *fbdev = container_of(work, struct omap_fbdev, work); 48 struct fb_info *fbi = fbdev->base.fbdev; 49 int npages; 50 51 /* DMM roll shifts in 4K pages: */ 52 npages = fbi->fix.line_length >> PAGE_SHIFT; 53 omap_gem_roll(fbdev->bo, fbi->var.yoffset * npages); 54 } 55 56 static int omap_fbdev_pan_display(struct fb_var_screeninfo *var, 57 struct fb_info *fbi) 58 { 59 struct drm_fb_helper *helper = get_fb(fbi); 60 struct omap_fbdev *fbdev = to_omap_fbdev(helper); 61 62 if (!helper) 63 goto fallback; 64 65 if (!fbdev->ywrap_enabled) 66 goto fallback; 67 68 if (drm_can_sleep()) { 69 pan_worker(&fbdev->work); 70 } else { 71 struct omap_drm_private *priv = helper->dev->dev_private; 72 queue_work(priv->wq, &fbdev->work); 73 } 74 75 return 0; 76 77 fallback: 78 return drm_fb_helper_pan_display(var, fbi); 79 } 80 81 static struct fb_ops omap_fb_ops = { 82 .owner = THIS_MODULE, 83 DRM_FB_HELPER_DEFAULT_OPS, 84 85 .fb_read = drm_fb_helper_sys_read, 86 .fb_write = drm_fb_helper_sys_write, 87 .fb_fillrect = drm_fb_helper_sys_fillrect, 88 .fb_copyarea = drm_fb_helper_sys_copyarea, 89 .fb_imageblit = drm_fb_helper_sys_imageblit, 90 91 .fb_pan_display = omap_fbdev_pan_display, 92 }; 93 94 static int omap_fbdev_create(struct drm_fb_helper *helper, 95 struct drm_fb_helper_surface_size *sizes) 96 { 97 struct omap_fbdev *fbdev = to_omap_fbdev(helper); 98 struct drm_device *dev = helper->dev; 99 struct omap_drm_private *priv = dev->dev_private; 100 struct drm_framebuffer *fb = NULL; 101 union omap_gem_size gsize; 102 struct fb_info *fbi = NULL; 103 struct drm_mode_fb_cmd2 mode_cmd = {0}; 104 dma_addr_t dma_addr; 105 int ret; 106 107 sizes->surface_bpp = 32; 108 sizes->surface_depth = 24; 109 110 DBG("create fbdev: %dx%d@%d (%dx%d)", sizes->surface_width, 111 sizes->surface_height, sizes->surface_bpp, 112 sizes->fb_width, sizes->fb_height); 113 114 mode_cmd.pixel_format = drm_mode_legacy_fb_format(sizes->surface_bpp, 115 sizes->surface_depth); 116 117 mode_cmd.width = sizes->surface_width; 118 mode_cmd.height = sizes->surface_height; 119 120 mode_cmd.pitches[0] = 121 DIV_ROUND_UP(mode_cmd.width * sizes->surface_bpp, 8); 122 123 fbdev->ywrap_enabled = priv->has_dmm && ywrap_enabled; 124 if (fbdev->ywrap_enabled) { 125 /* need to align pitch to page size if using DMM scrolling */ 126 mode_cmd.pitches[0] = PAGE_ALIGN(mode_cmd.pitches[0]); 127 } 128 129 /* allocate backing bo */ 130 gsize = (union omap_gem_size){ 131 .bytes = PAGE_ALIGN(mode_cmd.pitches[0] * mode_cmd.height), 132 }; 133 DBG("allocating %d bytes for fb %d", gsize.bytes, dev->primary->index); 134 fbdev->bo = omap_gem_new(dev, gsize, OMAP_BO_SCANOUT | OMAP_BO_WC); 135 if (!fbdev->bo) { 136 dev_err(dev->dev, "failed to allocate buffer object\n"); 137 ret = -ENOMEM; 138 goto fail; 139 } 140 141 fb = omap_framebuffer_init(dev, &mode_cmd, &fbdev->bo); 142 if (IS_ERR(fb)) { 143 dev_err(dev->dev, "failed to allocate fb\n"); 144 /* note: if fb creation failed, we can't rely on fb destroy 145 * to unref the bo: 146 */ 147 drm_gem_object_unreference_unlocked(fbdev->bo); 148 ret = PTR_ERR(fb); 149 goto fail; 150 } 151 152 /* note: this keeps the bo pinned.. which is perhaps not ideal, 153 * but is needed as long as we use fb_mmap() to mmap to userspace 154 * (since this happens using fix.smem_start). Possibly we could 155 * implement our own mmap using GEM mmap support to avoid this 156 * (non-tiled buffer doesn't need to be pinned for fbcon to write 157 * to it). Then we just need to be sure that we are able to re- 158 * pin it in case of an opps. 159 */ 160 ret = omap_gem_pin(fbdev->bo, &dma_addr); 161 if (ret) { 162 dev_err(dev->dev, "could not pin framebuffer\n"); 163 ret = -ENOMEM; 164 goto fail; 165 } 166 167 mutex_lock(&dev->struct_mutex); 168 169 fbi = drm_fb_helper_alloc_fbi(helper); 170 if (IS_ERR(fbi)) { 171 dev_err(dev->dev, "failed to allocate fb info\n"); 172 ret = PTR_ERR(fbi); 173 goto fail_unlock; 174 } 175 176 DBG("fbi=%p, dev=%p", fbi, dev); 177 178 fbdev->fb = fb; 179 helper->fb = fb; 180 181 fbi->par = helper; 182 fbi->fbops = &omap_fb_ops; 183 184 strcpy(fbi->fix.id, MODULE_NAME); 185 186 drm_fb_helper_fill_fix(fbi, fb->pitches[0], fb->format->depth); 187 drm_fb_helper_fill_var(fbi, helper, sizes->fb_width, sizes->fb_height); 188 189 dev->mode_config.fb_base = dma_addr; 190 191 fbi->screen_base = omap_gem_vaddr(fbdev->bo); 192 fbi->screen_size = fbdev->bo->size; 193 fbi->fix.smem_start = dma_addr; 194 fbi->fix.smem_len = fbdev->bo->size; 195 196 /* if we have DMM, then we can use it for scrolling by just 197 * shuffling pages around in DMM rather than doing sw blit. 198 */ 199 if (fbdev->ywrap_enabled) { 200 DRM_INFO("Enabling DMM ywrap scrolling\n"); 201 fbi->flags |= FBINFO_HWACCEL_YWRAP | FBINFO_READS_FAST; 202 fbi->fix.ywrapstep = 1; 203 } 204 205 206 DBG("par=%p, %dx%d", fbi->par, fbi->var.xres, fbi->var.yres); 207 DBG("allocated %dx%d fb", fbdev->fb->width, fbdev->fb->height); 208 209 mutex_unlock(&dev->struct_mutex); 210 211 return 0; 212 213 fail_unlock: 214 mutex_unlock(&dev->struct_mutex); 215 fail: 216 217 if (ret) { 218 if (fb) 219 drm_framebuffer_remove(fb); 220 } 221 222 return ret; 223 } 224 225 static const struct drm_fb_helper_funcs omap_fb_helper_funcs = { 226 .fb_probe = omap_fbdev_create, 227 }; 228 229 static struct drm_fb_helper *get_fb(struct fb_info *fbi) 230 { 231 if (!fbi || strcmp(fbi->fix.id, MODULE_NAME)) { 232 /* these are not the fb's you're looking for */ 233 return NULL; 234 } 235 return fbi->par; 236 } 237 238 /* initialize fbdev helper */ 239 struct drm_fb_helper *omap_fbdev_init(struct drm_device *dev) 240 { 241 struct omap_drm_private *priv = dev->dev_private; 242 struct omap_fbdev *fbdev = NULL; 243 struct drm_fb_helper *helper; 244 int ret = 0; 245 246 fbdev = kzalloc(sizeof(*fbdev), GFP_KERNEL); 247 if (!fbdev) 248 goto fail; 249 250 INIT_WORK(&fbdev->work, pan_worker); 251 252 helper = &fbdev->base; 253 254 drm_fb_helper_prepare(dev, helper, &omap_fb_helper_funcs); 255 256 ret = drm_fb_helper_init(dev, helper, priv->num_connectors); 257 if (ret) { 258 dev_err(dev->dev, "could not init fbdev: ret=%d\n", ret); 259 goto fail; 260 } 261 262 ret = drm_fb_helper_single_add_all_connectors(helper); 263 if (ret) 264 goto fini; 265 266 ret = drm_fb_helper_initial_config(helper, 32); 267 if (ret) 268 goto fini; 269 270 priv->fbdev = helper; 271 272 return helper; 273 274 fini: 275 drm_fb_helper_fini(helper); 276 fail: 277 kfree(fbdev); 278 279 dev_warn(dev->dev, "omap_fbdev_init failed\n"); 280 /* well, limp along without an fbdev.. maybe X11 will work? */ 281 282 return NULL; 283 } 284 285 void omap_fbdev_free(struct drm_device *dev) 286 { 287 struct omap_drm_private *priv = dev->dev_private; 288 struct drm_fb_helper *helper = priv->fbdev; 289 struct omap_fbdev *fbdev; 290 291 DBG(); 292 293 drm_fb_helper_unregister_fbi(helper); 294 295 drm_fb_helper_fini(helper); 296 297 fbdev = to_omap_fbdev(priv->fbdev); 298 299 /* unpin the GEM object pinned in omap_fbdev_create() */ 300 omap_gem_unpin(fbdev->bo); 301 302 /* this will free the backing object */ 303 if (fbdev->fb) 304 drm_framebuffer_remove(fbdev->fb); 305 306 kfree(fbdev); 307 308 priv->fbdev = NULL; 309 } 310