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 23 /* 24 * fbdev funcs, to implement legacy fbdev interface on top of drm driver 25 */ 26 27 #define to_msm_fbdev(x) container_of(x, struct msm_fbdev, base) 28 29 struct msm_fbdev { 30 struct drm_fb_helper base; 31 struct drm_framebuffer *fb; 32 struct drm_gem_object *bo; 33 }; 34 35 static struct fb_ops msm_fb_ops = { 36 .owner = THIS_MODULE, 37 38 /* Note: to properly handle manual update displays, we wrap the 39 * basic fbdev ops which write to the framebuffer 40 */ 41 .fb_read = fb_sys_read, 42 .fb_write = fb_sys_write, 43 .fb_fillrect = sys_fillrect, 44 .fb_copyarea = sys_copyarea, 45 .fb_imageblit = sys_imageblit, 46 47 .fb_check_var = drm_fb_helper_check_var, 48 .fb_set_par = drm_fb_helper_set_par, 49 .fb_pan_display = drm_fb_helper_pan_display, 50 .fb_blank = drm_fb_helper_blank, 51 .fb_setcmap = drm_fb_helper_setcmap, 52 }; 53 54 static int msm_fbdev_create(struct drm_fb_helper *helper, 55 struct drm_fb_helper_surface_size *sizes) 56 { 57 struct msm_fbdev *fbdev = to_msm_fbdev(helper); 58 struct drm_device *dev = helper->dev; 59 struct drm_framebuffer *fb = NULL; 60 struct fb_info *fbi = NULL; 61 struct drm_mode_fb_cmd2 mode_cmd = {0}; 62 dma_addr_t paddr; 63 int ret, size; 64 65 /* only doing ARGB32 since this is what is needed to alpha-blend 66 * with video overlays: 67 */ 68 sizes->surface_bpp = 32; 69 sizes->surface_depth = 32; 70 71 DBG("create fbdev: %dx%d@%d (%dx%d)", sizes->surface_width, 72 sizes->surface_height, sizes->surface_bpp, 73 sizes->fb_width, sizes->fb_height); 74 75 mode_cmd.pixel_format = drm_mode_legacy_fb_format(sizes->surface_bpp, 76 sizes->surface_depth); 77 78 mode_cmd.width = sizes->surface_width; 79 mode_cmd.height = sizes->surface_height; 80 81 mode_cmd.pitches[0] = align_pitch( 82 mode_cmd.width, sizes->surface_bpp); 83 84 /* allocate backing bo */ 85 size = mode_cmd.pitches[0] * mode_cmd.height; 86 DBG("allocating %d bytes for fb %d", size, dev->primary->index); 87 mutex_lock(&dev->struct_mutex); 88 fbdev->bo = msm_gem_new(dev, size, MSM_BO_SCANOUT | MSM_BO_WC); 89 mutex_unlock(&dev->struct_mutex); 90 if (IS_ERR(fbdev->bo)) { 91 ret = PTR_ERR(fbdev->bo); 92 fbdev->bo = NULL; 93 dev_err(dev->dev, "failed to allocate buffer object: %d\n", ret); 94 goto fail; 95 } 96 97 fb = msm_framebuffer_init(dev, &mode_cmd, &fbdev->bo); 98 if (IS_ERR(fb)) { 99 dev_err(dev->dev, "failed to allocate fb\n"); 100 /* note: if fb creation failed, we can't rely on fb destroy 101 * to unref the bo: 102 */ 103 drm_gem_object_unreference(fbdev->bo); 104 ret = PTR_ERR(fb); 105 goto fail; 106 } 107 108 mutex_lock(&dev->struct_mutex); 109 110 /* TODO implement our own fb_mmap so we don't need this: */ 111 msm_gem_get_iova_locked(fbdev->bo, 0, &paddr); 112 113 fbi = framebuffer_alloc(0, dev->dev); 114 if (!fbi) { 115 dev_err(dev->dev, "failed to allocate fb info\n"); 116 ret = -ENOMEM; 117 goto fail_unlock; 118 } 119 120 DBG("fbi=%p, dev=%p", fbi, dev); 121 122 fbdev->fb = fb; 123 helper->fb = fb; 124 helper->fbdev = fbi; 125 126 fbi->par = helper; 127 fbi->flags = FBINFO_DEFAULT; 128 fbi->fbops = &msm_fb_ops; 129 130 strcpy(fbi->fix.id, "msm"); 131 132 ret = fb_alloc_cmap(&fbi->cmap, 256, 0); 133 if (ret) { 134 ret = -ENOMEM; 135 goto fail_unlock; 136 } 137 138 drm_fb_helper_fill_fix(fbi, fb->pitches[0], fb->depth); 139 drm_fb_helper_fill_var(fbi, helper, sizes->fb_width, sizes->fb_height); 140 141 dev->mode_config.fb_base = paddr; 142 143 fbi->screen_base = msm_gem_vaddr_locked(fbdev->bo); 144 fbi->screen_size = fbdev->bo->size; 145 fbi->fix.smem_start = paddr; 146 fbi->fix.smem_len = fbdev->bo->size; 147 148 DBG("par=%p, %dx%d", fbi->par, fbi->var.xres, fbi->var.yres); 149 DBG("allocated %dx%d fb", fbdev->fb->width, fbdev->fb->height); 150 151 mutex_unlock(&dev->struct_mutex); 152 153 return 0; 154 155 fail_unlock: 156 mutex_unlock(&dev->struct_mutex); 157 fail: 158 159 if (ret) { 160 if (fbi) 161 framebuffer_release(fbi); 162 if (fb) { 163 drm_framebuffer_unregister_private(fb); 164 drm_framebuffer_remove(fb); 165 } 166 } 167 168 return ret; 169 } 170 171 static void msm_crtc_fb_gamma_set(struct drm_crtc *crtc, 172 u16 red, u16 green, u16 blue, int regno) 173 { 174 DBG("fbdev: set gamma"); 175 } 176 177 static void msm_crtc_fb_gamma_get(struct drm_crtc *crtc, 178 u16 *red, u16 *green, u16 *blue, int regno) 179 { 180 DBG("fbdev: get gamma"); 181 } 182 183 static struct drm_fb_helper_funcs msm_fb_helper_funcs = { 184 .gamma_set = msm_crtc_fb_gamma_set, 185 .gamma_get = msm_crtc_fb_gamma_get, 186 .fb_probe = msm_fbdev_create, 187 }; 188 189 /* initialize fbdev helper */ 190 struct drm_fb_helper *msm_fbdev_init(struct drm_device *dev) 191 { 192 struct msm_drm_private *priv = dev->dev_private; 193 struct msm_fbdev *fbdev = NULL; 194 struct drm_fb_helper *helper; 195 int ret = 0; 196 197 fbdev = kzalloc(sizeof(*fbdev), GFP_KERNEL); 198 if (!fbdev) 199 goto fail; 200 201 helper = &fbdev->base; 202 203 helper->funcs = &msm_fb_helper_funcs; 204 205 ret = drm_fb_helper_init(dev, helper, 206 priv->num_crtcs, priv->num_connectors); 207 if (ret) { 208 dev_err(dev->dev, "could not init fbdev: ret=%d\n", ret); 209 goto fail; 210 } 211 212 drm_fb_helper_single_add_all_connectors(helper); 213 214 /* disable all the possible outputs/crtcs before entering KMS mode */ 215 drm_helper_disable_unused_functions(dev); 216 217 drm_fb_helper_initial_config(helper, 32); 218 219 priv->fbdev = helper; 220 221 return helper; 222 223 fail: 224 kfree(fbdev); 225 return NULL; 226 } 227 228 void msm_fbdev_free(struct drm_device *dev) 229 { 230 struct msm_drm_private *priv = dev->dev_private; 231 struct drm_fb_helper *helper = priv->fbdev; 232 struct msm_fbdev *fbdev; 233 struct fb_info *fbi; 234 235 DBG(); 236 237 fbi = helper->fbdev; 238 239 /* only cleanup framebuffer if it is present */ 240 if (fbi) { 241 unregister_framebuffer(fbi); 242 framebuffer_release(fbi); 243 } 244 245 drm_fb_helper_fini(helper); 246 247 fbdev = to_msm_fbdev(priv->fbdev); 248 249 /* this will free the backing object */ 250 if (fbdev->fb) { 251 drm_framebuffer_unregister_private(fbdev->fb); 252 drm_framebuffer_remove(fbdev->fb); 253 } 254 255 kfree(fbdev); 256 257 priv->fbdev = NULL; 258 } 259