1 /* 2 * Copyright (C) 2013 Red Hat 3 * Author: Rob Clark <robdclark@gmail.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 "msm_drv.h" 19 20 #include "drm_crtc.h" 21 #include "drm_fb_helper.h" 22 #include "msm_gem.h" 23 24 extern int msm_gem_mmap_obj(struct drm_gem_object *obj, 25 struct vm_area_struct *vma); 26 static int msm_fbdev_mmap(struct fb_info *info, struct vm_area_struct *vma); 27 28 /* 29 * fbdev funcs, to implement legacy fbdev interface on top of drm driver 30 */ 31 32 #define to_msm_fbdev(x) container_of(x, struct msm_fbdev, base) 33 34 struct msm_fbdev { 35 struct drm_fb_helper base; 36 struct drm_framebuffer *fb; 37 struct drm_gem_object *bo; 38 }; 39 40 static struct fb_ops msm_fb_ops = { 41 .owner = THIS_MODULE, 42 43 /* Note: to properly handle manual update displays, we wrap the 44 * basic fbdev ops which write to the framebuffer 45 */ 46 .fb_read = fb_sys_read, 47 .fb_write = fb_sys_write, 48 .fb_fillrect = sys_fillrect, 49 .fb_copyarea = sys_copyarea, 50 .fb_imageblit = sys_imageblit, 51 .fb_mmap = msm_fbdev_mmap, 52 53 .fb_check_var = drm_fb_helper_check_var, 54 .fb_set_par = drm_fb_helper_set_par, 55 .fb_pan_display = drm_fb_helper_pan_display, 56 .fb_blank = drm_fb_helper_blank, 57 .fb_setcmap = drm_fb_helper_setcmap, 58 }; 59 60 static int msm_fbdev_mmap(struct fb_info *info, struct vm_area_struct *vma) 61 { 62 struct drm_fb_helper *helper = (struct drm_fb_helper *)info->par; 63 struct msm_fbdev *fbdev = to_msm_fbdev(helper); 64 struct drm_gem_object *drm_obj = fbdev->bo; 65 struct drm_device *dev = helper->dev; 66 int ret = 0; 67 68 if (drm_device_is_unplugged(dev)) 69 return -ENODEV; 70 71 mutex_lock(&dev->struct_mutex); 72 73 ret = drm_gem_mmap_obj(drm_obj, drm_obj->size, vma); 74 75 mutex_unlock(&dev->struct_mutex); 76 77 if (ret) { 78 pr_err("%s:drm_gem_mmap_obj fail\n", __func__); 79 return ret; 80 } 81 82 return msm_gem_mmap_obj(drm_obj, vma); 83 } 84 85 static int msm_fbdev_create(struct drm_fb_helper *helper, 86 struct drm_fb_helper_surface_size *sizes) 87 { 88 struct msm_fbdev *fbdev = to_msm_fbdev(helper); 89 struct drm_device *dev = helper->dev; 90 struct drm_framebuffer *fb = NULL; 91 struct fb_info *fbi = NULL; 92 struct drm_mode_fb_cmd2 mode_cmd = {0}; 93 uint32_t paddr; 94 int ret, size; 95 96 DBG("create fbdev: %dx%d@%d (%dx%d)", sizes->surface_width, 97 sizes->surface_height, sizes->surface_bpp, 98 sizes->fb_width, sizes->fb_height); 99 100 mode_cmd.pixel_format = drm_mode_legacy_fb_format(sizes->surface_bpp, 101 sizes->surface_depth); 102 103 mode_cmd.width = sizes->surface_width; 104 mode_cmd.height = sizes->surface_height; 105 106 mode_cmd.pitches[0] = align_pitch( 107 mode_cmd.width, sizes->surface_bpp); 108 109 /* allocate backing bo */ 110 size = mode_cmd.pitches[0] * mode_cmd.height; 111 DBG("allocating %d bytes for fb %d", size, dev->primary->index); 112 mutex_lock(&dev->struct_mutex); 113 fbdev->bo = msm_gem_new(dev, size, MSM_BO_SCANOUT | MSM_BO_WC); 114 mutex_unlock(&dev->struct_mutex); 115 if (IS_ERR(fbdev->bo)) { 116 ret = PTR_ERR(fbdev->bo); 117 fbdev->bo = NULL; 118 dev_err(dev->dev, "failed to allocate buffer object: %d\n", ret); 119 goto fail; 120 } 121 122 fb = msm_framebuffer_init(dev, &mode_cmd, &fbdev->bo); 123 if (IS_ERR(fb)) { 124 dev_err(dev->dev, "failed to allocate fb\n"); 125 /* note: if fb creation failed, we can't rely on fb destroy 126 * to unref the bo: 127 */ 128 drm_gem_object_unreference(fbdev->bo); 129 ret = PTR_ERR(fb); 130 goto fail; 131 } 132 133 mutex_lock(&dev->struct_mutex); 134 135 /* 136 * NOTE: if we can be guaranteed to be able to map buffer 137 * in panic (ie. lock-safe, etc) we could avoid pinning the 138 * buffer now: 139 */ 140 ret = msm_gem_get_iova_locked(fbdev->bo, 0, &paddr); 141 if (ret) { 142 dev_err(dev->dev, "failed to get buffer obj iova: %d\n", ret); 143 goto fail_unlock; 144 } 145 146 fbi = framebuffer_alloc(0, dev->dev); 147 if (!fbi) { 148 dev_err(dev->dev, "failed to allocate fb info\n"); 149 ret = -ENOMEM; 150 goto fail_unlock; 151 } 152 153 DBG("fbi=%p, dev=%p", fbi, dev); 154 155 fbdev->fb = fb; 156 helper->fb = fb; 157 helper->fbdev = fbi; 158 159 fbi->par = helper; 160 fbi->flags = FBINFO_DEFAULT; 161 fbi->fbops = &msm_fb_ops; 162 163 strcpy(fbi->fix.id, "msm"); 164 165 ret = fb_alloc_cmap(&fbi->cmap, 256, 0); 166 if (ret) { 167 ret = -ENOMEM; 168 goto fail_unlock; 169 } 170 171 drm_fb_helper_fill_fix(fbi, fb->pitches[0], fb->depth); 172 drm_fb_helper_fill_var(fbi, helper, sizes->fb_width, sizes->fb_height); 173 174 dev->mode_config.fb_base = paddr; 175 176 fbi->screen_base = msm_gem_vaddr_locked(fbdev->bo); 177 fbi->screen_size = fbdev->bo->size; 178 fbi->fix.smem_start = paddr; 179 fbi->fix.smem_len = fbdev->bo->size; 180 181 DBG("par=%p, %dx%d", fbi->par, fbi->var.xres, fbi->var.yres); 182 DBG("allocated %dx%d fb", fbdev->fb->width, fbdev->fb->height); 183 184 mutex_unlock(&dev->struct_mutex); 185 186 return 0; 187 188 fail_unlock: 189 mutex_unlock(&dev->struct_mutex); 190 fail: 191 192 if (ret) { 193 framebuffer_release(fbi); 194 if (fb) { 195 drm_framebuffer_unregister_private(fb); 196 drm_framebuffer_remove(fb); 197 } 198 } 199 200 return ret; 201 } 202 203 static void msm_crtc_fb_gamma_set(struct drm_crtc *crtc, 204 u16 red, u16 green, u16 blue, int regno) 205 { 206 DBG("fbdev: set gamma"); 207 } 208 209 static void msm_crtc_fb_gamma_get(struct drm_crtc *crtc, 210 u16 *red, u16 *green, u16 *blue, int regno) 211 { 212 DBG("fbdev: get gamma"); 213 } 214 215 static const struct drm_fb_helper_funcs msm_fb_helper_funcs = { 216 .gamma_set = msm_crtc_fb_gamma_set, 217 .gamma_get = msm_crtc_fb_gamma_get, 218 .fb_probe = msm_fbdev_create, 219 }; 220 221 /* initialize fbdev helper */ 222 struct drm_fb_helper *msm_fbdev_init(struct drm_device *dev) 223 { 224 struct msm_drm_private *priv = dev->dev_private; 225 struct msm_fbdev *fbdev = NULL; 226 struct drm_fb_helper *helper; 227 int ret; 228 229 fbdev = kzalloc(sizeof(*fbdev), GFP_KERNEL); 230 if (!fbdev) 231 goto fail; 232 233 helper = &fbdev->base; 234 235 drm_fb_helper_prepare(dev, helper, &msm_fb_helper_funcs); 236 237 ret = drm_fb_helper_init(dev, helper, 238 priv->num_crtcs, priv->num_connectors); 239 if (ret) { 240 dev_err(dev->dev, "could not init fbdev: ret=%d\n", ret); 241 goto fail; 242 } 243 244 drm_fb_helper_single_add_all_connectors(helper); 245 246 /* disable all the possible outputs/crtcs before entering KMS mode */ 247 drm_helper_disable_unused_functions(dev); 248 249 drm_fb_helper_initial_config(helper, 32); 250 251 priv->fbdev = helper; 252 253 return helper; 254 255 fail: 256 kfree(fbdev); 257 return NULL; 258 } 259 260 void msm_fbdev_free(struct drm_device *dev) 261 { 262 struct msm_drm_private *priv = dev->dev_private; 263 struct drm_fb_helper *helper = priv->fbdev; 264 struct msm_fbdev *fbdev; 265 struct fb_info *fbi; 266 267 DBG(); 268 269 fbi = helper->fbdev; 270 271 /* only cleanup framebuffer if it is present */ 272 if (fbi) { 273 unregister_framebuffer(fbi); 274 framebuffer_release(fbi); 275 } 276 277 drm_fb_helper_fini(helper); 278 279 fbdev = to_msm_fbdev(priv->fbdev); 280 281 /* this will free the backing object */ 282 if (fbdev->fb) { 283 drm_framebuffer_unregister_private(fbdev->fb); 284 drm_framebuffer_remove(fbdev->fb); 285 } 286 287 kfree(fbdev); 288 289 priv->fbdev = NULL; 290 } 291