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 = drm_fb_helper_sys_read, 47 .fb_write = drm_fb_helper_sys_write, 48 .fb_fillrect = drm_fb_helper_sys_fillrect, 49 .fb_copyarea = drm_fb_helper_sys_copyarea, 50 .fb_imageblit = drm_fb_helper_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 ret = drm_gem_mmap_obj(drm_obj, drm_obj->size, vma); 72 if (ret) { 73 pr_err("%s:drm_gem_mmap_obj fail\n", __func__); 74 return ret; 75 } 76 77 return msm_gem_mmap_obj(drm_obj, vma); 78 } 79 80 static int msm_fbdev_create(struct drm_fb_helper *helper, 81 struct drm_fb_helper_surface_size *sizes) 82 { 83 struct msm_fbdev *fbdev = to_msm_fbdev(helper); 84 struct drm_device *dev = helper->dev; 85 struct drm_framebuffer *fb = NULL; 86 struct fb_info *fbi = NULL; 87 struct drm_mode_fb_cmd2 mode_cmd = {0}; 88 uint32_t paddr; 89 int ret, size; 90 91 DBG("create fbdev: %dx%d@%d (%dx%d)", sizes->surface_width, 92 sizes->surface_height, sizes->surface_bpp, 93 sizes->fb_width, sizes->fb_height); 94 95 mode_cmd.pixel_format = drm_mode_legacy_fb_format(sizes->surface_bpp, 96 sizes->surface_depth); 97 98 mode_cmd.width = sizes->surface_width; 99 mode_cmd.height = sizes->surface_height; 100 101 mode_cmd.pitches[0] = align_pitch( 102 mode_cmd.width, sizes->surface_bpp); 103 104 /* allocate backing bo */ 105 size = mode_cmd.pitches[0] * mode_cmd.height; 106 DBG("allocating %d bytes for fb %d", size, dev->primary->index); 107 mutex_lock(&dev->struct_mutex); 108 fbdev->bo = msm_gem_new(dev, size, MSM_BO_SCANOUT | 109 MSM_BO_WC | MSM_BO_STOLEN); 110 mutex_unlock(&dev->struct_mutex); 111 if (IS_ERR(fbdev->bo)) { 112 ret = PTR_ERR(fbdev->bo); 113 fbdev->bo = NULL; 114 dev_err(dev->dev, "failed to allocate buffer object: %d\n", ret); 115 goto fail; 116 } 117 118 fb = msm_framebuffer_init(dev, &mode_cmd, &fbdev->bo); 119 if (IS_ERR(fb)) { 120 dev_err(dev->dev, "failed to allocate fb\n"); 121 /* note: if fb creation failed, we can't rely on fb destroy 122 * to unref the bo: 123 */ 124 drm_gem_object_unreference_unlocked(fbdev->bo); 125 ret = PTR_ERR(fb); 126 goto fail; 127 } 128 129 mutex_lock(&dev->struct_mutex); 130 131 /* 132 * NOTE: if we can be guaranteed to be able to map buffer 133 * in panic (ie. lock-safe, etc) we could avoid pinning the 134 * buffer now: 135 */ 136 ret = msm_gem_get_iova_locked(fbdev->bo, 0, &paddr); 137 if (ret) { 138 dev_err(dev->dev, "failed to get buffer obj iova: %d\n", ret); 139 goto fail_unlock; 140 } 141 142 fbi = drm_fb_helper_alloc_fbi(helper); 143 if (IS_ERR(fbi)) { 144 dev_err(dev->dev, "failed to allocate fb info\n"); 145 ret = PTR_ERR(fbi); 146 goto fail_unlock; 147 } 148 149 DBG("fbi=%p, dev=%p", fbi, dev); 150 151 fbdev->fb = fb; 152 helper->fb = fb; 153 154 fbi->par = helper; 155 fbi->flags = FBINFO_DEFAULT; 156 fbi->fbops = &msm_fb_ops; 157 158 strcpy(fbi->fix.id, "msm"); 159 160 drm_fb_helper_fill_fix(fbi, fb->pitches[0], fb->depth); 161 drm_fb_helper_fill_var(fbi, helper, sizes->fb_width, sizes->fb_height); 162 163 dev->mode_config.fb_base = paddr; 164 165 fbi->screen_base = msm_gem_vaddr_locked(fbdev->bo); 166 fbi->screen_size = fbdev->bo->size; 167 fbi->fix.smem_start = paddr; 168 fbi->fix.smem_len = fbdev->bo->size; 169 170 DBG("par=%p, %dx%d", fbi->par, fbi->var.xres, fbi->var.yres); 171 DBG("allocated %dx%d fb", fbdev->fb->width, fbdev->fb->height); 172 173 mutex_unlock(&dev->struct_mutex); 174 175 return 0; 176 177 fail_unlock: 178 mutex_unlock(&dev->struct_mutex); 179 fail: 180 181 if (ret) { 182 if (fb) { 183 drm_framebuffer_unregister_private(fb); 184 drm_framebuffer_remove(fb); 185 } 186 } 187 188 return ret; 189 } 190 191 static void msm_crtc_fb_gamma_set(struct drm_crtc *crtc, 192 u16 red, u16 green, u16 blue, int regno) 193 { 194 DBG("fbdev: set gamma"); 195 } 196 197 static void msm_crtc_fb_gamma_get(struct drm_crtc *crtc, 198 u16 *red, u16 *green, u16 *blue, int regno) 199 { 200 DBG("fbdev: get gamma"); 201 } 202 203 static const struct drm_fb_helper_funcs msm_fb_helper_funcs = { 204 .gamma_set = msm_crtc_fb_gamma_set, 205 .gamma_get = msm_crtc_fb_gamma_get, 206 .fb_probe = msm_fbdev_create, 207 }; 208 209 /* initialize fbdev helper */ 210 struct drm_fb_helper *msm_fbdev_init(struct drm_device *dev) 211 { 212 struct msm_drm_private *priv = dev->dev_private; 213 struct msm_fbdev *fbdev = NULL; 214 struct drm_fb_helper *helper; 215 int ret; 216 217 fbdev = kzalloc(sizeof(*fbdev), GFP_KERNEL); 218 if (!fbdev) 219 goto fail; 220 221 helper = &fbdev->base; 222 223 drm_fb_helper_prepare(dev, helper, &msm_fb_helper_funcs); 224 225 ret = drm_fb_helper_init(dev, helper, 226 priv->num_crtcs, priv->num_connectors); 227 if (ret) { 228 dev_err(dev->dev, "could not init fbdev: ret=%d\n", ret); 229 goto fail; 230 } 231 232 ret = drm_fb_helper_single_add_all_connectors(helper); 233 if (ret) 234 goto fini; 235 236 ret = drm_fb_helper_initial_config(helper, 32); 237 if (ret) 238 goto fini; 239 240 priv->fbdev = helper; 241 242 return helper; 243 244 fini: 245 drm_fb_helper_fini(helper); 246 fail: 247 kfree(fbdev); 248 return NULL; 249 } 250 251 void msm_fbdev_free(struct drm_device *dev) 252 { 253 struct msm_drm_private *priv = dev->dev_private; 254 struct drm_fb_helper *helper = priv->fbdev; 255 struct msm_fbdev *fbdev; 256 257 DBG(); 258 259 drm_fb_helper_unregister_fbi(helper); 260 drm_fb_helper_release_fbi(helper); 261 262 drm_fb_helper_fini(helper); 263 264 fbdev = to_msm_fbdev(priv->fbdev); 265 266 /* this will free the backing object */ 267 if (fbdev->fb) { 268 drm_framebuffer_unregister_private(fbdev->fb); 269 drm_framebuffer_remove(fbdev->fb); 270 } 271 272 kfree(fbdev); 273 274 priv->fbdev = NULL; 275 } 276