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 int ret = 0; 66 67 ret = drm_gem_mmap_obj(drm_obj, drm_obj->size, vma); 68 if (ret) { 69 pr_err("%s:drm_gem_mmap_obj fail\n", __func__); 70 return ret; 71 } 72 73 return msm_gem_mmap_obj(drm_obj, vma); 74 } 75 76 static int msm_fbdev_create(struct drm_fb_helper *helper, 77 struct drm_fb_helper_surface_size *sizes) 78 { 79 struct msm_fbdev *fbdev = to_msm_fbdev(helper); 80 struct drm_device *dev = helper->dev; 81 struct drm_framebuffer *fb = NULL; 82 struct fb_info *fbi = NULL; 83 struct drm_mode_fb_cmd2 mode_cmd = {0}; 84 uint32_t paddr; 85 int ret, size; 86 87 DBG("create fbdev: %dx%d@%d (%dx%d)", sizes->surface_width, 88 sizes->surface_height, sizes->surface_bpp, 89 sizes->fb_width, sizes->fb_height); 90 91 mode_cmd.pixel_format = drm_mode_legacy_fb_format(sizes->surface_bpp, 92 sizes->surface_depth); 93 94 mode_cmd.width = sizes->surface_width; 95 mode_cmd.height = sizes->surface_height; 96 97 mode_cmd.pitches[0] = align_pitch( 98 mode_cmd.width, sizes->surface_bpp); 99 100 /* allocate backing bo */ 101 size = mode_cmd.pitches[0] * mode_cmd.height; 102 DBG("allocating %d bytes for fb %d", size, dev->primary->index); 103 mutex_lock(&dev->struct_mutex); 104 fbdev->bo = msm_gem_new(dev, size, MSM_BO_SCANOUT | 105 MSM_BO_WC | MSM_BO_STOLEN); 106 mutex_unlock(&dev->struct_mutex); 107 if (IS_ERR(fbdev->bo)) { 108 ret = PTR_ERR(fbdev->bo); 109 fbdev->bo = NULL; 110 dev_err(dev->dev, "failed to allocate buffer object: %d\n", ret); 111 goto fail; 112 } 113 114 fb = msm_framebuffer_init(dev, &mode_cmd, &fbdev->bo); 115 if (IS_ERR(fb)) { 116 dev_err(dev->dev, "failed to allocate fb\n"); 117 /* note: if fb creation failed, we can't rely on fb destroy 118 * to unref the bo: 119 */ 120 drm_gem_object_unreference_unlocked(fbdev->bo); 121 ret = PTR_ERR(fb); 122 goto fail; 123 } 124 125 mutex_lock(&dev->struct_mutex); 126 127 /* 128 * NOTE: if we can be guaranteed to be able to map buffer 129 * in panic (ie. lock-safe, etc) we could avoid pinning the 130 * buffer now: 131 */ 132 ret = msm_gem_get_iova_locked(fbdev->bo, 0, &paddr); 133 if (ret) { 134 dev_err(dev->dev, "failed to get buffer obj iova: %d\n", ret); 135 goto fail_unlock; 136 } 137 138 fbi = drm_fb_helper_alloc_fbi(helper); 139 if (IS_ERR(fbi)) { 140 dev_err(dev->dev, "failed to allocate fb info\n"); 141 ret = PTR_ERR(fbi); 142 goto fail_unlock; 143 } 144 145 DBG("fbi=%p, dev=%p", fbi, dev); 146 147 fbdev->fb = fb; 148 helper->fb = fb; 149 150 fbi->par = helper; 151 fbi->flags = FBINFO_DEFAULT; 152 fbi->fbops = &msm_fb_ops; 153 154 strcpy(fbi->fix.id, "msm"); 155 156 drm_fb_helper_fill_fix(fbi, fb->pitches[0], fb->depth); 157 drm_fb_helper_fill_var(fbi, helper, sizes->fb_width, sizes->fb_height); 158 159 dev->mode_config.fb_base = paddr; 160 161 fbi->screen_base = msm_gem_get_vaddr_locked(fbdev->bo); 162 if (IS_ERR(fbi->screen_base)) { 163 ret = PTR_ERR(fbi->screen_base); 164 goto fail_unlock; 165 } 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 const struct drm_fb_helper_funcs msm_fb_helper_funcs = { 192 .fb_probe = msm_fbdev_create, 193 }; 194 195 /* initialize fbdev helper */ 196 struct drm_fb_helper *msm_fbdev_init(struct drm_device *dev) 197 { 198 struct msm_drm_private *priv = dev->dev_private; 199 struct msm_fbdev *fbdev = NULL; 200 struct drm_fb_helper *helper; 201 int ret; 202 203 fbdev = kzalloc(sizeof(*fbdev), GFP_KERNEL); 204 if (!fbdev) 205 goto fail; 206 207 helper = &fbdev->base; 208 209 drm_fb_helper_prepare(dev, helper, &msm_fb_helper_funcs); 210 211 ret = drm_fb_helper_init(dev, helper, 212 priv->num_crtcs, priv->num_connectors); 213 if (ret) { 214 dev_err(dev->dev, "could not init fbdev: ret=%d\n", ret); 215 goto fail; 216 } 217 218 ret = drm_fb_helper_single_add_all_connectors(helper); 219 if (ret) 220 goto fini; 221 222 ret = drm_fb_helper_initial_config(helper, 32); 223 if (ret) 224 goto fini; 225 226 priv->fbdev = helper; 227 228 return helper; 229 230 fini: 231 drm_fb_helper_fini(helper); 232 fail: 233 kfree(fbdev); 234 return NULL; 235 } 236 237 void msm_fbdev_free(struct drm_device *dev) 238 { 239 struct msm_drm_private *priv = dev->dev_private; 240 struct drm_fb_helper *helper = priv->fbdev; 241 struct msm_fbdev *fbdev; 242 243 DBG(); 244 245 drm_fb_helper_unregister_fbi(helper); 246 drm_fb_helper_release_fbi(helper); 247 248 drm_fb_helper_fini(helper); 249 250 fbdev = to_msm_fbdev(priv->fbdev); 251 252 /* this will free the backing object */ 253 if (fbdev->fb) { 254 msm_gem_put_vaddr(fbdev->bo); 255 drm_framebuffer_unregister_private(fbdev->fb); 256 drm_framebuffer_remove(fbdev->fb); 257 } 258 259 kfree(fbdev); 260 261 priv->fbdev = NULL; 262 } 263