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 uint32_t paddr; 63 int ret, size; 64 65 sizes->surface_bpp = 32; 66 sizes->surface_depth = 24; 67 68 DBG("create fbdev: %dx%d@%d (%dx%d)", sizes->surface_width, 69 sizes->surface_height, sizes->surface_bpp, 70 sizes->fb_width, sizes->fb_height); 71 72 mode_cmd.pixel_format = drm_mode_legacy_fb_format(sizes->surface_bpp, 73 sizes->surface_depth); 74 75 mode_cmd.width = sizes->surface_width; 76 mode_cmd.height = sizes->surface_height; 77 78 mode_cmd.pitches[0] = align_pitch( 79 mode_cmd.width, sizes->surface_bpp); 80 81 /* allocate backing bo */ 82 size = mode_cmd.pitches[0] * mode_cmd.height; 83 DBG("allocating %d bytes for fb %d", size, dev->primary->index); 84 mutex_lock(&dev->struct_mutex); 85 fbdev->bo = msm_gem_new(dev, size, MSM_BO_SCANOUT | MSM_BO_WC); 86 mutex_unlock(&dev->struct_mutex); 87 if (IS_ERR(fbdev->bo)) { 88 ret = PTR_ERR(fbdev->bo); 89 fbdev->bo = NULL; 90 dev_err(dev->dev, "failed to allocate buffer object: %d\n", ret); 91 goto fail; 92 } 93 94 fb = msm_framebuffer_init(dev, &mode_cmd, &fbdev->bo); 95 if (IS_ERR(fb)) { 96 dev_err(dev->dev, "failed to allocate fb\n"); 97 /* note: if fb creation failed, we can't rely on fb destroy 98 * to unref the bo: 99 */ 100 drm_gem_object_unreference(fbdev->bo); 101 ret = PTR_ERR(fb); 102 goto fail; 103 } 104 105 mutex_lock(&dev->struct_mutex); 106 107 /* TODO implement our own fb_mmap so we don't need this: */ 108 msm_gem_get_iova_locked(fbdev->bo, 0, &paddr); 109 110 fbi = framebuffer_alloc(0, dev->dev); 111 if (!fbi) { 112 dev_err(dev->dev, "failed to allocate fb info\n"); 113 ret = -ENOMEM; 114 goto fail_unlock; 115 } 116 117 DBG("fbi=%p, dev=%p", fbi, dev); 118 119 fbdev->fb = fb; 120 helper->fb = fb; 121 helper->fbdev = fbi; 122 123 fbi->par = helper; 124 fbi->flags = FBINFO_DEFAULT; 125 fbi->fbops = &msm_fb_ops; 126 127 strcpy(fbi->fix.id, "msm"); 128 129 ret = fb_alloc_cmap(&fbi->cmap, 256, 0); 130 if (ret) { 131 ret = -ENOMEM; 132 goto fail_unlock; 133 } 134 135 drm_fb_helper_fill_fix(fbi, fb->pitches[0], fb->depth); 136 drm_fb_helper_fill_var(fbi, helper, sizes->fb_width, sizes->fb_height); 137 138 dev->mode_config.fb_base = paddr; 139 140 fbi->screen_base = msm_gem_vaddr_locked(fbdev->bo); 141 fbi->screen_size = fbdev->bo->size; 142 fbi->fix.smem_start = paddr; 143 fbi->fix.smem_len = fbdev->bo->size; 144 145 DBG("par=%p, %dx%d", fbi->par, fbi->var.xres, fbi->var.yres); 146 DBG("allocated %dx%d fb", fbdev->fb->width, fbdev->fb->height); 147 148 mutex_unlock(&dev->struct_mutex); 149 150 return 0; 151 152 fail_unlock: 153 mutex_unlock(&dev->struct_mutex); 154 fail: 155 156 if (ret) { 157 if (fbi) 158 framebuffer_release(fbi); 159 if (fb) { 160 drm_framebuffer_unregister_private(fb); 161 drm_framebuffer_remove(fb); 162 } 163 } 164 165 return ret; 166 } 167 168 static void msm_crtc_fb_gamma_set(struct drm_crtc *crtc, 169 u16 red, u16 green, u16 blue, int regno) 170 { 171 DBG("fbdev: set gamma"); 172 } 173 174 static void msm_crtc_fb_gamma_get(struct drm_crtc *crtc, 175 u16 *red, u16 *green, u16 *blue, int regno) 176 { 177 DBG("fbdev: get gamma"); 178 } 179 180 static struct drm_fb_helper_funcs msm_fb_helper_funcs = { 181 .gamma_set = msm_crtc_fb_gamma_set, 182 .gamma_get = msm_crtc_fb_gamma_get, 183 .fb_probe = msm_fbdev_create, 184 }; 185 186 /* initialize fbdev helper */ 187 struct drm_fb_helper *msm_fbdev_init(struct drm_device *dev) 188 { 189 struct msm_drm_private *priv = dev->dev_private; 190 struct msm_fbdev *fbdev = NULL; 191 struct drm_fb_helper *helper; 192 int ret = 0; 193 194 fbdev = kzalloc(sizeof(*fbdev), GFP_KERNEL); 195 if (!fbdev) 196 goto fail; 197 198 helper = &fbdev->base; 199 200 helper->funcs = &msm_fb_helper_funcs; 201 202 ret = drm_fb_helper_init(dev, helper, 203 priv->num_crtcs, priv->num_connectors); 204 if (ret) { 205 dev_err(dev->dev, "could not init fbdev: ret=%d\n", ret); 206 goto fail; 207 } 208 209 drm_fb_helper_single_add_all_connectors(helper); 210 211 /* disable all the possible outputs/crtcs before entering KMS mode */ 212 drm_helper_disable_unused_functions(dev); 213 214 drm_fb_helper_initial_config(helper, 32); 215 216 priv->fbdev = helper; 217 218 return helper; 219 220 fail: 221 kfree(fbdev); 222 return NULL; 223 } 224 225 void msm_fbdev_free(struct drm_device *dev) 226 { 227 struct msm_drm_private *priv = dev->dev_private; 228 struct drm_fb_helper *helper = priv->fbdev; 229 struct msm_fbdev *fbdev; 230 struct fb_info *fbi; 231 232 DBG(); 233 234 fbi = helper->fbdev; 235 236 /* only cleanup framebuffer if it is present */ 237 if (fbi) { 238 unregister_framebuffer(fbi); 239 framebuffer_release(fbi); 240 } 241 242 drm_fb_helper_fini(helper); 243 244 fbdev = to_msm_fbdev(priv->fbdev); 245 246 /* this will free the backing object */ 247 if (fbdev->fb) { 248 drm_framebuffer_unregister_private(fbdev->fb); 249 drm_framebuffer_remove(fbdev->fb); 250 } 251 252 kfree(fbdev); 253 254 priv->fbdev = NULL; 255 } 256