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 <drm/drm_crtc.h> 19 #include <drm/drm_fb_helper.h> 20 21 #include "msm_drv.h" 22 #include "msm_kms.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 }; 38 39 static struct fb_ops msm_fb_ops = { 40 .owner = THIS_MODULE, 41 DRM_FB_HELPER_DEFAULT_OPS, 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 54 static int msm_fbdev_mmap(struct fb_info *info, struct vm_area_struct *vma) 55 { 56 struct drm_fb_helper *helper = (struct drm_fb_helper *)info->par; 57 struct msm_fbdev *fbdev = to_msm_fbdev(helper); 58 struct drm_gem_object *bo = msm_framebuffer_bo(fbdev->fb, 0); 59 int ret = 0; 60 61 ret = drm_gem_mmap_obj(bo, bo->size, vma); 62 if (ret) { 63 pr_err("%s:drm_gem_mmap_obj fail\n", __func__); 64 return ret; 65 } 66 67 return msm_gem_mmap_obj(bo, vma); 68 } 69 70 static int msm_fbdev_create(struct drm_fb_helper *helper, 71 struct drm_fb_helper_surface_size *sizes) 72 { 73 struct msm_fbdev *fbdev = to_msm_fbdev(helper); 74 struct drm_device *dev = helper->dev; 75 struct msm_drm_private *priv = dev->dev_private; 76 struct drm_framebuffer *fb = NULL; 77 struct drm_gem_object *bo; 78 struct fb_info *fbi = NULL; 79 uint64_t paddr; 80 uint32_t format; 81 int ret, pitch; 82 83 format = drm_mode_legacy_fb_format(sizes->surface_bpp, sizes->surface_depth); 84 85 DBG("create fbdev: %dx%d@%d (%dx%d)", sizes->surface_width, 86 sizes->surface_height, sizes->surface_bpp, 87 sizes->fb_width, sizes->fb_height); 88 89 pitch = align_pitch(sizes->surface_width, sizes->surface_bpp); 90 fb = msm_alloc_stolen_fb(dev, sizes->surface_width, 91 sizes->surface_height, pitch, format); 92 93 if (IS_ERR(fb)) { 94 DRM_DEV_ERROR(dev->dev, "failed to allocate fb\n"); 95 return PTR_ERR(fb); 96 } 97 98 bo = msm_framebuffer_bo(fb, 0); 99 100 mutex_lock(&dev->struct_mutex); 101 102 /* 103 * NOTE: if we can be guaranteed to be able to map buffer 104 * in panic (ie. lock-safe, etc) we could avoid pinning the 105 * buffer now: 106 */ 107 ret = msm_gem_get_and_pin_iova(bo, priv->kms->aspace, &paddr); 108 if (ret) { 109 DRM_DEV_ERROR(dev->dev, "failed to get buffer obj iova: %d\n", ret); 110 goto fail_unlock; 111 } 112 113 fbi = drm_fb_helper_alloc_fbi(helper); 114 if (IS_ERR(fbi)) { 115 DRM_DEV_ERROR(dev->dev, "failed to allocate fb info\n"); 116 ret = PTR_ERR(fbi); 117 goto fail_unlock; 118 } 119 120 DBG("fbi=%p, dev=%p", fbi, dev); 121 122 fbdev->fb = fb; 123 helper->fb = fb; 124 125 fbi->fbops = &msm_fb_ops; 126 127 drm_fb_helper_fill_info(fbi, helper, sizes); 128 129 dev->mode_config.fb_base = paddr; 130 131 fbi->screen_base = msm_gem_get_vaddr(bo); 132 if (IS_ERR(fbi->screen_base)) { 133 ret = PTR_ERR(fbi->screen_base); 134 goto fail_unlock; 135 } 136 fbi->screen_size = bo->size; 137 fbi->fix.smem_start = paddr; 138 fbi->fix.smem_len = bo->size; 139 140 DBG("par=%p, %dx%d", fbi->par, fbi->var.xres, fbi->var.yres); 141 DBG("allocated %dx%d fb", fbdev->fb->width, fbdev->fb->height); 142 143 mutex_unlock(&dev->struct_mutex); 144 145 return 0; 146 147 fail_unlock: 148 mutex_unlock(&dev->struct_mutex); 149 drm_framebuffer_remove(fb); 150 return ret; 151 } 152 153 static const struct drm_fb_helper_funcs msm_fb_helper_funcs = { 154 .fb_probe = msm_fbdev_create, 155 }; 156 157 /* initialize fbdev helper */ 158 struct drm_fb_helper *msm_fbdev_init(struct drm_device *dev) 159 { 160 struct msm_drm_private *priv = dev->dev_private; 161 struct msm_fbdev *fbdev = NULL; 162 struct drm_fb_helper *helper; 163 int ret; 164 165 fbdev = kzalloc(sizeof(*fbdev), GFP_KERNEL); 166 if (!fbdev) 167 goto fail; 168 169 helper = &fbdev->base; 170 171 drm_fb_helper_prepare(dev, helper, &msm_fb_helper_funcs); 172 173 ret = drm_fb_helper_init(dev, helper, priv->num_connectors); 174 if (ret) { 175 DRM_DEV_ERROR(dev->dev, "could not init fbdev: ret=%d\n", ret); 176 goto fail; 177 } 178 179 ret = drm_fb_helper_single_add_all_connectors(helper); 180 if (ret) 181 goto fini; 182 183 ret = drm_fb_helper_initial_config(helper, 32); 184 if (ret) 185 goto fini; 186 187 priv->fbdev = helper; 188 189 return helper; 190 191 fini: 192 drm_fb_helper_fini(helper); 193 fail: 194 kfree(fbdev); 195 return NULL; 196 } 197 198 void msm_fbdev_free(struct drm_device *dev) 199 { 200 struct msm_drm_private *priv = dev->dev_private; 201 struct drm_fb_helper *helper = priv->fbdev; 202 struct msm_fbdev *fbdev; 203 204 DBG(); 205 206 drm_fb_helper_unregister_fbi(helper); 207 208 drm_fb_helper_fini(helper); 209 210 fbdev = to_msm_fbdev(priv->fbdev); 211 212 /* this will free the backing object */ 213 if (fbdev->fb) { 214 struct drm_gem_object *bo = 215 msm_framebuffer_bo(fbdev->fb, 0); 216 msm_gem_put_vaddr(bo); 217 drm_framebuffer_remove(fbdev->fb); 218 } 219 220 kfree(fbdev); 221 222 priv->fbdev = NULL; 223 } 224