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 DRM_FB_HELPER_DEFAULT_OPS, 43 44 /* Note: to properly handle manual update displays, we wrap the 45 * basic fbdev ops which write to the framebuffer 46 */ 47 .fb_read = drm_fb_helper_sys_read, 48 .fb_write = drm_fb_helper_sys_write, 49 .fb_fillrect = drm_fb_helper_sys_fillrect, 50 .fb_copyarea = drm_fb_helper_sys_copyarea, 51 .fb_imageblit = drm_fb_helper_sys_imageblit, 52 .fb_mmap = msm_fbdev_mmap, 53 }; 54 55 static int msm_fbdev_mmap(struct fb_info *info, struct vm_area_struct *vma) 56 { 57 struct drm_fb_helper *helper = (struct drm_fb_helper *)info->par; 58 struct msm_fbdev *fbdev = to_msm_fbdev(helper); 59 struct drm_gem_object *drm_obj = fbdev->bo; 60 int ret = 0; 61 62 ret = drm_gem_mmap_obj(drm_obj, drm_obj->size, vma); 63 if (ret) { 64 pr_err("%s:drm_gem_mmap_obj fail\n", __func__); 65 return ret; 66 } 67 68 return msm_gem_mmap_obj(drm_obj, vma); 69 } 70 71 static int msm_fbdev_create(struct drm_fb_helper *helper, 72 struct drm_fb_helper_surface_size *sizes) 73 { 74 struct msm_fbdev *fbdev = to_msm_fbdev(helper); 75 struct drm_device *dev = helper->dev; 76 struct drm_framebuffer *fb = NULL; 77 struct fb_info *fbi = NULL; 78 struct drm_mode_fb_cmd2 mode_cmd = {0}; 79 uint64_t paddr; 80 int ret, size; 81 82 DBG("create fbdev: %dx%d@%d (%dx%d)", sizes->surface_width, 83 sizes->surface_height, sizes->surface_bpp, 84 sizes->fb_width, sizes->fb_height); 85 86 mode_cmd.pixel_format = drm_mode_legacy_fb_format(sizes->surface_bpp, 87 sizes->surface_depth); 88 89 mode_cmd.width = sizes->surface_width; 90 mode_cmd.height = sizes->surface_height; 91 92 mode_cmd.pitches[0] = align_pitch( 93 mode_cmd.width, sizes->surface_bpp); 94 95 /* allocate backing bo */ 96 size = mode_cmd.pitches[0] * mode_cmd.height; 97 DBG("allocating %d bytes for fb %d", size, dev->primary->index); 98 mutex_lock(&dev->struct_mutex); 99 fbdev->bo = msm_gem_new(dev, size, MSM_BO_SCANOUT | 100 MSM_BO_WC | MSM_BO_STOLEN); 101 mutex_unlock(&dev->struct_mutex); 102 if (IS_ERR(fbdev->bo)) { 103 ret = PTR_ERR(fbdev->bo); 104 fbdev->bo = NULL; 105 dev_err(dev->dev, "failed to allocate buffer object: %d\n", ret); 106 goto fail; 107 } 108 109 fb = msm_framebuffer_init(dev, &mode_cmd, &fbdev->bo); 110 if (IS_ERR(fb)) { 111 dev_err(dev->dev, "failed to allocate fb\n"); 112 /* note: if fb creation failed, we can't rely on fb destroy 113 * to unref the bo: 114 */ 115 drm_gem_object_unreference_unlocked(fbdev->bo); 116 ret = PTR_ERR(fb); 117 goto fail; 118 } 119 120 mutex_lock(&dev->struct_mutex); 121 122 /* 123 * NOTE: if we can be guaranteed to be able to map buffer 124 * in panic (ie. lock-safe, etc) we could avoid pinning the 125 * buffer now: 126 */ 127 ret = msm_gem_get_iova_locked(fbdev->bo, 0, &paddr); 128 if (ret) { 129 dev_err(dev->dev, "failed to get buffer obj iova: %d\n", ret); 130 goto fail_unlock; 131 } 132 133 fbi = drm_fb_helper_alloc_fbi(helper); 134 if (IS_ERR(fbi)) { 135 dev_err(dev->dev, "failed to allocate fb info\n"); 136 ret = PTR_ERR(fbi); 137 goto fail_unlock; 138 } 139 140 DBG("fbi=%p, dev=%p", fbi, dev); 141 142 fbdev->fb = fb; 143 helper->fb = fb; 144 145 fbi->par = helper; 146 fbi->flags = FBINFO_DEFAULT; 147 fbi->fbops = &msm_fb_ops; 148 149 strcpy(fbi->fix.id, "msm"); 150 151 drm_fb_helper_fill_fix(fbi, fb->pitches[0], fb->format->depth); 152 drm_fb_helper_fill_var(fbi, helper, sizes->fb_width, sizes->fb_height); 153 154 dev->mode_config.fb_base = paddr; 155 156 fbi->screen_base = msm_gem_get_vaddr_locked(fbdev->bo); 157 if (IS_ERR(fbi->screen_base)) { 158 ret = PTR_ERR(fbi->screen_base); 159 goto fail_unlock; 160 } 161 fbi->screen_size = fbdev->bo->size; 162 fbi->fix.smem_start = paddr; 163 fbi->fix.smem_len = fbdev->bo->size; 164 165 DBG("par=%p, %dx%d", fbi->par, fbi->var.xres, fbi->var.yres); 166 DBG("allocated %dx%d fb", fbdev->fb->width, fbdev->fb->height); 167 168 mutex_unlock(&dev->struct_mutex); 169 170 return 0; 171 172 fail_unlock: 173 mutex_unlock(&dev->struct_mutex); 174 fail: 175 176 if (ret) { 177 if (fb) 178 drm_framebuffer_remove(fb); 179 } 180 181 return ret; 182 } 183 184 static const struct drm_fb_helper_funcs msm_fb_helper_funcs = { 185 .fb_probe = msm_fbdev_create, 186 }; 187 188 /* initialize fbdev helper */ 189 struct drm_fb_helper *msm_fbdev_init(struct drm_device *dev) 190 { 191 struct msm_drm_private *priv = dev->dev_private; 192 struct msm_fbdev *fbdev = NULL; 193 struct drm_fb_helper *helper; 194 int ret; 195 196 fbdev = kzalloc(sizeof(*fbdev), GFP_KERNEL); 197 if (!fbdev) 198 goto fail; 199 200 helper = &fbdev->base; 201 202 drm_fb_helper_prepare(dev, helper, &msm_fb_helper_funcs); 203 204 ret = drm_fb_helper_init(dev, helper, priv->num_connectors); 205 if (ret) { 206 dev_err(dev->dev, "could not init fbdev: ret=%d\n", ret); 207 goto fail; 208 } 209 210 ret = drm_fb_helper_single_add_all_connectors(helper); 211 if (ret) 212 goto fini; 213 214 ret = drm_fb_helper_initial_config(helper, 32); 215 if (ret) 216 goto fini; 217 218 priv->fbdev = helper; 219 220 return helper; 221 222 fini: 223 drm_fb_helper_fini(helper); 224 fail: 225 kfree(fbdev); 226 return NULL; 227 } 228 229 void msm_fbdev_free(struct drm_device *dev) 230 { 231 struct msm_drm_private *priv = dev->dev_private; 232 struct drm_fb_helper *helper = priv->fbdev; 233 struct msm_fbdev *fbdev; 234 235 DBG(); 236 237 drm_fb_helper_unregister_fbi(helper); 238 239 drm_fb_helper_fini(helper); 240 241 fbdev = to_msm_fbdev(priv->fbdev); 242 243 /* this will free the backing object */ 244 if (fbdev->fb) { 245 msm_gem_put_vaddr(fbdev->bo); 246 drm_framebuffer_remove(fbdev->fb); 247 } 248 249 kfree(fbdev); 250 251 priv->fbdev = NULL; 252 } 253