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_util.h> 20 #include <drm/drm_fb_helper.h> 21 22 #include "omap_drv.h" 23 24 MODULE_PARM_DESC(ywrap, "Enable ywrap scrolling (omap44xx and later, default 'y')"); 25 static bool ywrap_enabled = true; 26 module_param_named(ywrap, ywrap_enabled, bool, 0644); 27 28 /* 29 * fbdev funcs, to implement legacy fbdev interface on top of drm driver 30 */ 31 32 #define to_omap_fbdev(x) container_of(x, struct omap_fbdev, base) 33 34 struct omap_fbdev { 35 struct drm_fb_helper base; 36 struct drm_framebuffer *fb; 37 struct drm_gem_object *bo; 38 bool ywrap_enabled; 39 40 /* for deferred dmm roll when getting called in atomic ctx */ 41 struct work_struct work; 42 }; 43 44 static struct drm_fb_helper *get_fb(struct fb_info *fbi); 45 46 static void pan_worker(struct work_struct *work) 47 { 48 struct omap_fbdev *fbdev = container_of(work, struct omap_fbdev, work); 49 struct fb_info *fbi = fbdev->base.fbdev; 50 int npages; 51 52 /* DMM roll shifts in 4K pages: */ 53 npages = fbi->fix.line_length >> PAGE_SHIFT; 54 omap_gem_roll(fbdev->bo, fbi->var.yoffset * npages); 55 } 56 57 static int omap_fbdev_pan_display(struct fb_var_screeninfo *var, 58 struct fb_info *fbi) 59 { 60 struct drm_fb_helper *helper = get_fb(fbi); 61 struct omap_fbdev *fbdev = to_omap_fbdev(helper); 62 63 if (!helper) 64 goto fallback; 65 66 if (!fbdev->ywrap_enabled) 67 goto fallback; 68 69 if (drm_can_sleep()) { 70 pan_worker(&fbdev->work); 71 } else { 72 struct omap_drm_private *priv = helper->dev->dev_private; 73 queue_work(priv->wq, &fbdev->work); 74 } 75 76 return 0; 77 78 fallback: 79 return drm_fb_helper_pan_display(var, fbi); 80 } 81 82 static struct fb_ops omap_fb_ops = { 83 .owner = THIS_MODULE, 84 85 .fb_check_var = drm_fb_helper_check_var, 86 .fb_set_par = drm_fb_helper_set_par, 87 .fb_setcmap = drm_fb_helper_setcmap, 88 .fb_blank = drm_fb_helper_blank, 89 .fb_pan_display = omap_fbdev_pan_display, 90 .fb_debug_enter = drm_fb_helper_debug_enter, 91 .fb_debug_leave = drm_fb_helper_debug_leave, 92 .fb_ioctl = drm_fb_helper_ioctl, 93 94 .fb_read = drm_fb_helper_sys_read, 95 .fb_write = drm_fb_helper_sys_write, 96 .fb_fillrect = drm_fb_helper_sys_fillrect, 97 .fb_copyarea = drm_fb_helper_sys_copyarea, 98 .fb_imageblit = drm_fb_helper_sys_imageblit, 99 }; 100 101 static int omap_fbdev_create(struct drm_fb_helper *helper, 102 struct drm_fb_helper_surface_size *sizes) 103 { 104 struct omap_fbdev *fbdev = to_omap_fbdev(helper); 105 struct drm_device *dev = helper->dev; 106 struct omap_drm_private *priv = dev->dev_private; 107 struct drm_framebuffer *fb = NULL; 108 union omap_gem_size gsize; 109 struct fb_info *fbi = NULL; 110 struct drm_mode_fb_cmd2 mode_cmd = {0}; 111 dma_addr_t dma_addr; 112 int ret; 113 114 sizes->surface_bpp = 32; 115 sizes->surface_depth = 24; 116 117 DBG("create fbdev: %dx%d@%d (%dx%d)", sizes->surface_width, 118 sizes->surface_height, sizes->surface_bpp, 119 sizes->fb_width, sizes->fb_height); 120 121 mode_cmd.pixel_format = drm_mode_legacy_fb_format(sizes->surface_bpp, 122 sizes->surface_depth); 123 124 mode_cmd.width = sizes->surface_width; 125 mode_cmd.height = sizes->surface_height; 126 127 mode_cmd.pitches[0] = 128 DIV_ROUND_UP(mode_cmd.width * sizes->surface_bpp, 8); 129 130 fbdev->ywrap_enabled = priv->has_dmm && ywrap_enabled; 131 if (fbdev->ywrap_enabled) { 132 /* need to align pitch to page size if using DMM scrolling */ 133 mode_cmd.pitches[0] = PAGE_ALIGN(mode_cmd.pitches[0]); 134 } 135 136 /* allocate backing bo */ 137 gsize = (union omap_gem_size){ 138 .bytes = PAGE_ALIGN(mode_cmd.pitches[0] * mode_cmd.height), 139 }; 140 DBG("allocating %d bytes for fb %d", gsize.bytes, dev->primary->index); 141 fbdev->bo = omap_gem_new(dev, gsize, OMAP_BO_SCANOUT | OMAP_BO_WC); 142 if (!fbdev->bo) { 143 dev_err(dev->dev, "failed to allocate buffer object\n"); 144 ret = -ENOMEM; 145 goto fail; 146 } 147 148 fb = omap_framebuffer_init(dev, &mode_cmd, &fbdev->bo); 149 if (IS_ERR(fb)) { 150 dev_err(dev->dev, "failed to allocate fb\n"); 151 /* note: if fb creation failed, we can't rely on fb destroy 152 * to unref the bo: 153 */ 154 drm_gem_object_put_unlocked(fbdev->bo); 155 ret = PTR_ERR(fb); 156 goto fail; 157 } 158 159 /* note: this keeps the bo pinned.. which is perhaps not ideal, 160 * but is needed as long as we use fb_mmap() to mmap to userspace 161 * (since this happens using fix.smem_start). Possibly we could 162 * implement our own mmap using GEM mmap support to avoid this 163 * (non-tiled buffer doesn't need to be pinned for fbcon to write 164 * to it). Then we just need to be sure that we are able to re- 165 * pin it in case of an opps. 166 */ 167 ret = omap_gem_pin(fbdev->bo, &dma_addr); 168 if (ret) { 169 dev_err(dev->dev, "could not pin framebuffer\n"); 170 ret = -ENOMEM; 171 goto fail; 172 } 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; 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_buffer = 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 return 0; 215 216 fail: 217 218 if (ret) { 219 if (fb) 220 drm_framebuffer_remove(fb); 221 } 222 223 return ret; 224 } 225 226 static const struct drm_fb_helper_funcs omap_fb_helper_funcs = { 227 .fb_probe = omap_fbdev_create, 228 }; 229 230 static struct drm_fb_helper *get_fb(struct fb_info *fbi) 231 { 232 if (!fbi || strcmp(fbi->fix.id, MODULE_NAME)) { 233 /* these are not the fb's you're looking for */ 234 return NULL; 235 } 236 return fbi->par; 237 } 238 239 /* initialize fbdev helper */ 240 void omap_fbdev_init(struct drm_device *dev) 241 { 242 struct omap_drm_private *priv = dev->dev_private; 243 struct omap_fbdev *fbdev = NULL; 244 struct drm_fb_helper *helper; 245 int ret = 0; 246 247 if (!priv->num_pipes) 248 return; 249 250 fbdev = kzalloc(sizeof(*fbdev), GFP_KERNEL); 251 if (!fbdev) 252 goto fail; 253 254 INIT_WORK(&fbdev->work, pan_worker); 255 256 helper = &fbdev->base; 257 258 drm_fb_helper_prepare(dev, helper, &omap_fb_helper_funcs); 259 260 ret = drm_fb_helper_init(dev, helper, priv->num_pipes); 261 if (ret) 262 goto fail; 263 264 ret = drm_fb_helper_single_add_all_connectors(helper); 265 if (ret) 266 goto fini; 267 268 ret = drm_fb_helper_initial_config(helper, 32); 269 if (ret) 270 goto fini; 271 272 priv->fbdev = helper; 273 274 return; 275 276 fini: 277 drm_fb_helper_fini(helper); 278 fail: 279 kfree(fbdev); 280 281 dev_warn(dev->dev, "omap_fbdev_init failed\n"); 282 } 283 284 void omap_fbdev_fini(struct drm_device *dev) 285 { 286 struct omap_drm_private *priv = dev->dev_private; 287 struct drm_fb_helper *helper = priv->fbdev; 288 struct omap_fbdev *fbdev; 289 290 DBG(); 291 292 if (!helper) 293 return; 294 295 drm_fb_helper_unregister_fbi(helper); 296 297 drm_fb_helper_fini(helper); 298 299 fbdev = to_omap_fbdev(helper); 300 301 /* unpin the GEM object pinned in omap_fbdev_create() */ 302 if (fbdev->bo) 303 omap_gem_unpin(fbdev->bo); 304 305 /* this will free the backing object */ 306 if (fbdev->fb) 307 drm_framebuffer_remove(fbdev->fb); 308 309 kfree(fbdev); 310 311 priv->fbdev = NULL; 312 } 313